2 * Copyright (C) 2011 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include "class_linker.h"
27 #include <unordered_map>
31 #include "art_field-inl.h"
32 #include "art_method-inl.h"
33 #include "base/arena_allocator.h"
34 #include "base/casts.h"
35 #include "base/logging.h"
36 #include "base/scoped_arena_containers.h"
37 #include "base/scoped_flock.h"
38 #include "base/stl_util.h"
39 #include "base/systrace.h"
40 #include "base/time_utils.h"
41 #include "base/unix_file/fd_file.h"
42 #include "base/value_object.h"
43 #include "class_linker-inl.h"
44 #include "class_table-inl.h"
45 #include "compiler_callbacks.h"
47 #include "dex_file-inl.h"
48 #include "entrypoints/entrypoint_utils.h"
49 #include "entrypoints/runtime_asm_entrypoints.h"
50 #include "experimental_flags.h"
51 #include "gc_root-inl.h"
52 #include "gc/accounting/card_table-inl.h"
53 #include "gc/accounting/heap_bitmap-inl.h"
55 #include "gc/scoped_gc_critical_section.h"
56 #include "gc/space/image_space.h"
57 #include "handle_scope-inl.h"
58 #include "image-inl.h"
59 #include "intern_table.h"
60 #include "interpreter/interpreter.h"
62 #include "jit/jit_code_cache.h"
63 #include "jit/offline_profiling_info.h"
65 #include "linear_alloc.h"
66 #include "mirror/class.h"
67 #include "mirror/class-inl.h"
68 #include "mirror/class_loader.h"
69 #include "mirror/dex_cache-inl.h"
70 #include "mirror/field.h"
71 #include "mirror/iftable-inl.h"
72 #include "mirror/method.h"
73 #include "mirror/object-inl.h"
74 #include "mirror/object_array-inl.h"
75 #include "mirror/proxy.h"
76 #include "mirror/reference-inl.h"
77 #include "mirror/stack_trace_element.h"
78 #include "mirror/string-inl.h"
79 #include "native/dalvik_system_DexFile.h"
82 #include "oat_file-inl.h"
83 #include "oat_file_assistant.h"
84 #include "oat_file_manager.h"
85 #include "object_lock.h"
88 #include "ScopedLocalRef.h"
89 #include "scoped_thread_state_change.h"
90 #include "thread-inl.h"
93 #include "utils/dex_cache_arrays_layout-inl.h"
94 #include "verifier/method_verifier.h"
95 #include "well_known_classes.h"
99 static constexpr bool kSanityCheckObjects = kIsDebugBuild;
100 static constexpr bool kVerifyArtMethodDeclaringClasses = kIsDebugBuild;
102 static void ThrowNoClassDefFoundError(const char* fmt, ...)
103 __attribute__((__format__(__printf__, 1, 2)))
104 SHARED_REQUIRES(Locks::mutator_lock_);
105 static void ThrowNoClassDefFoundError(const char* fmt, ...) {
108 Thread* self = Thread::Current();
109 self->ThrowNewExceptionV("Ljava/lang/NoClassDefFoundError;", fmt, args);
113 static bool HasInitWithString(Thread* self, ClassLinker* class_linker, const char* descriptor)
114 SHARED_REQUIRES(Locks::mutator_lock_) {
115 ArtMethod* method = self->GetCurrentMethod(nullptr);
116 StackHandleScope<1> hs(self);
117 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(method != nullptr ?
118 method->GetDeclaringClass()->GetClassLoader() : nullptr));
119 mirror::Class* exception_class = class_linker->FindClass(self, descriptor, class_loader);
121 if (exception_class == nullptr) {
122 // No exc class ~ no <init>-with-string.
123 CHECK(self->IsExceptionPending());
124 self->ClearException();
128 ArtMethod* exception_init_method = exception_class->FindDeclaredDirectMethod(
129 "<init>", "(Ljava/lang/String;)V", class_linker->GetImagePointerSize());
130 return exception_init_method != nullptr;
133 // Helper for ThrowEarlierClassFailure. Throws the stored error.
134 static void HandleEarlierVerifyError(Thread* self, ClassLinker* class_linker, mirror::Class* c)
135 SHARED_REQUIRES(Locks::mutator_lock_) {
136 mirror::Object* obj = c->GetVerifyError();
137 DCHECK(obj != nullptr);
138 self->AssertNoPendingException();
139 if (obj->IsClass()) {
140 // Previous error has been stored as class. Create a new exception of that type.
142 // It's possible the exception doesn't have a <init>(String).
144 const char* descriptor = obj->AsClass()->GetDescriptor(&temp);
146 if (HasInitWithString(self, class_linker, descriptor)) {
147 self->ThrowNewException(descriptor, PrettyDescriptor(c).c_str());
149 self->ThrowNewException(descriptor, nullptr);
152 // Previous error has been stored as an instance. Just rethrow.
153 mirror::Class* throwable_class =
154 self->DecodeJObject(WellKnownClasses::java_lang_Throwable)->AsClass();
155 mirror::Class* error_class = obj->GetClass();
156 CHECK(throwable_class->IsAssignableFrom(error_class));
157 self->SetException(obj->AsThrowable());
159 self->AssertPendingException();
162 void ClassLinker::ThrowEarlierClassFailure(mirror::Class* c, bool wrap_in_no_class_def) {
163 // The class failed to initialize on a previous attempt, so we want to throw
164 // a NoClassDefFoundError (v2 2.17.5). The exception to this rule is if we
165 // failed in verification, in which case v2 5.4.1 says we need to re-throw
166 // the previous error.
167 Runtime* const runtime = Runtime::Current();
168 if (!runtime->IsAotCompiler()) { // Give info if this occurs at runtime.
170 if (c->GetVerifyError() != nullptr) {
171 mirror::Object* verify_error = c->GetVerifyError();
172 if (verify_error->IsClass()) {
173 extra = PrettyDescriptor(verify_error->AsClass());
175 extra = verify_error->AsThrowable()->Dump();
178 LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c) << ": " << extra;
181 CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus();
182 Thread* self = Thread::Current();
183 if (runtime->IsAotCompiler()) {
184 // At compile time, accurate errors and NCDFE are disabled to speed compilation.
185 mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError();
186 self->SetException(pre_allocated);
188 if (c->GetVerifyError() != nullptr) {
189 // Rethrow stored error.
190 HandleEarlierVerifyError(self, this, c);
192 if (c->GetVerifyError() == nullptr || wrap_in_no_class_def) {
193 // If there isn't a recorded earlier error, or this is a repeat throw from initialization,
194 // the top-level exception must be a NoClassDefFoundError. The potentially already pending
195 // exception will be a cause.
196 self->ThrowNewWrappedException("Ljava/lang/NoClassDefFoundError;",
197 PrettyDescriptor(c).c_str());
202 static void VlogClassInitializationFailure(Handle<mirror::Class> klass)
203 SHARED_REQUIRES(Locks::mutator_lock_) {
204 if (VLOG_IS_ON(class_linker)) {
206 LOG(INFO) << "Failed to initialize class " << klass->GetDescriptor(&temp) << " from "
207 << klass->GetLocation() << "\n" << Thread::Current()->GetException()->Dump();
211 static void WrapExceptionInInitializer(Handle<mirror::Class> klass)
212 SHARED_REQUIRES(Locks::mutator_lock_) {
213 Thread* self = Thread::Current();
214 JNIEnv* env = self->GetJniEnv();
216 ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred());
217 CHECK(cause.get() != nullptr);
219 env->ExceptionClear();
220 bool is_error = env->IsInstanceOf(cause.get(), WellKnownClasses::java_lang_Error);
221 env->Throw(cause.get());
223 // We only wrap non-Error exceptions; an Error can just be used as-is.
225 self->ThrowNewWrappedException("Ljava/lang/ExceptionInInitializerError;", nullptr);
227 VlogClassInitializationFailure(klass);
230 // Gap between two fields in object layout.
232 uint32_t start_offset; // The offset from the start of the object.
233 uint32_t size; // The gap size of 1, 2, or 4 bytes.
235 struct FieldGapsComparator {
236 explicit FieldGapsComparator() {
238 bool operator() (const FieldGap& lhs, const FieldGap& rhs)
239 NO_THREAD_SAFETY_ANALYSIS {
240 // Sort by gap size, largest first. Secondary sort by starting offset.
241 // Note that the priority queue returns the largest element, so operator()
242 // should return true if lhs is less than rhs.
243 return lhs.size < rhs.size || (lhs.size == rhs.size && lhs.start_offset > rhs.start_offset);
246 typedef std::priority_queue<FieldGap, std::vector<FieldGap>, FieldGapsComparator> FieldGaps;
248 // Adds largest aligned gaps to queue of gaps.
249 static void AddFieldGap(uint32_t gap_start, uint32_t gap_end, FieldGaps* gaps) {
250 DCHECK(gaps != nullptr);
252 uint32_t current_offset = gap_start;
253 while (current_offset != gap_end) {
254 size_t remaining = gap_end - current_offset;
255 if (remaining >= sizeof(uint32_t) && IsAligned<4>(current_offset)) {
256 gaps->push(FieldGap {current_offset, sizeof(uint32_t)});
257 current_offset += sizeof(uint32_t);
258 } else if (remaining >= sizeof(uint16_t) && IsAligned<2>(current_offset)) {
259 gaps->push(FieldGap {current_offset, sizeof(uint16_t)});
260 current_offset += sizeof(uint16_t);
262 gaps->push(FieldGap {current_offset, sizeof(uint8_t)});
263 current_offset += sizeof(uint8_t);
265 DCHECK_LE(current_offset, gap_end) << "Overran gap";
268 // Shuffle fields forward, making use of gaps whenever possible.
270 static void ShuffleForward(size_t* current_field_idx,
271 MemberOffset* field_offset,
272 std::deque<ArtField*>* grouped_and_sorted_fields,
274 SHARED_REQUIRES(Locks::mutator_lock_) {
275 DCHECK(current_field_idx != nullptr);
276 DCHECK(grouped_and_sorted_fields != nullptr);
277 DCHECK(gaps != nullptr);
278 DCHECK(field_offset != nullptr);
280 DCHECK(IsPowerOfTwo(n));
281 while (!grouped_and_sorted_fields->empty()) {
282 ArtField* field = grouped_and_sorted_fields->front();
283 Primitive::Type type = field->GetTypeAsPrimitiveType();
284 if (Primitive::ComponentSize(type) < n) {
287 if (!IsAligned<n>(field_offset->Uint32Value())) {
288 MemberOffset old_offset = *field_offset;
289 *field_offset = MemberOffset(RoundUp(field_offset->Uint32Value(), n));
290 AddFieldGap(old_offset.Uint32Value(), field_offset->Uint32Value(), gaps);
292 CHECK(type != Primitive::kPrimNot) << PrettyField(field); // should be primitive types
293 grouped_and_sorted_fields->pop_front();
294 if (!gaps->empty() && gaps->top().size >= n) {
295 FieldGap gap = gaps->top();
297 DCHECK_ALIGNED(gap.start_offset, n);
298 field->SetOffset(MemberOffset(gap.start_offset));
300 AddFieldGap(gap.start_offset + n, gap.start_offset + gap.size, gaps);
303 DCHECK_ALIGNED(field_offset->Uint32Value(), n);
304 field->SetOffset(*field_offset);
305 *field_offset = MemberOffset(field_offset->Uint32Value() + n);
307 ++(*current_field_idx);
311 ClassLinker::ClassLinker(InternTable* intern_table)
312 // dex_lock_ is recursive as it may be used in stack dumping.
313 : dex_lock_("ClassLinker dex lock", kDefaultMutexLevel),
314 dex_cache_boot_image_class_lookup_required_(false),
315 failed_dex_cache_class_lookups_(0),
316 class_roots_(nullptr),
317 array_iftable_(nullptr),
318 find_array_class_cache_next_victim_(0),
320 log_new_class_table_roots_(false),
321 intern_table_(intern_table),
322 quick_resolution_trampoline_(nullptr),
323 quick_imt_conflict_trampoline_(nullptr),
324 quick_generic_jni_trampoline_(nullptr),
325 quick_to_interpreter_bridge_trampoline_(nullptr),
326 image_pointer_size_(sizeof(void*)) {
327 CHECK(intern_table_ != nullptr);
328 static_assert(kFindArrayCacheSize == arraysize(find_array_class_cache_),
329 "Array cache size wrong.");
330 std::fill_n(find_array_class_cache_, kFindArrayCacheSize, GcRoot<mirror::Class>(nullptr));
333 void ClassLinker::CheckSystemClass(Thread* self, Handle<mirror::Class> c1, const char* descriptor) {
334 mirror::Class* c2 = FindSystemClass(self, descriptor);
336 LOG(FATAL) << "Could not find class " << descriptor;
339 if (c1.Get() != c2) {
340 std::ostringstream os1, os2;
341 c1->DumpClass(os1, mirror::Class::kDumpClassFullDetail);
342 c2->DumpClass(os2, mirror::Class::kDumpClassFullDetail);
343 LOG(FATAL) << "InitWithoutImage: Class mismatch for " << descriptor
344 << ". This is most likely the result of a broken build. Make sure that "
345 << "libcore and art projects match.\n\n"
346 << os1.str() << "\n\n" << os2.str();
351 bool ClassLinker::InitWithoutImage(std::vector<std::unique_ptr<const DexFile>> boot_class_path,
352 std::string* error_msg) {
353 VLOG(startup) << "ClassLinker::Init";
355 Thread* const self = Thread::Current();
356 Runtime* const runtime = Runtime::Current();
357 gc::Heap* const heap = runtime->GetHeap();
359 CHECK(!heap->HasBootImageSpace()) << "Runtime has image. We should use it.";
362 // Use the pointer size from the runtime since we are probably creating the image.
363 image_pointer_size_ = InstructionSetPointerSize(runtime->GetInstructionSet());
364 if (!ValidPointerSize(image_pointer_size_)) {
365 *error_msg = StringPrintf("Invalid image pointer size: %zu", image_pointer_size_);
369 // java_lang_Class comes first, it's needed for AllocClass
370 // The GC can't handle an object with a null class since we can't get the size of this object.
371 heap->IncrementDisableMovingGC(self);
372 StackHandleScope<64> hs(self); // 64 is picked arbitrarily.
373 auto class_class_size = mirror::Class::ClassClassSize(image_pointer_size_);
374 Handle<mirror::Class> java_lang_Class(hs.NewHandle(down_cast<mirror::Class*>(
375 heap->AllocNonMovableObject<true>(self, nullptr, class_class_size, VoidFunctor()))));
376 CHECK(java_lang_Class.Get() != nullptr);
377 mirror::Class::SetClassClass(java_lang_Class.Get());
378 java_lang_Class->SetClass(java_lang_Class.Get());
379 if (kUseBakerOrBrooksReadBarrier) {
380 java_lang_Class->AssertReadBarrierPointer();
382 java_lang_Class->SetClassSize(class_class_size);
383 java_lang_Class->SetPrimitiveType(Primitive::kPrimNot);
384 heap->DecrementDisableMovingGC(self);
385 // AllocClass(mirror::Class*) can now be used
387 // Class[] is used for reflection support.
388 auto class_array_class_size = mirror::ObjectArray<mirror::Class>::ClassSize(image_pointer_size_);
389 Handle<mirror::Class> class_array_class(hs.NewHandle(
390 AllocClass(self, java_lang_Class.Get(), class_array_class_size)));
391 class_array_class->SetComponentType(java_lang_Class.Get());
393 // java_lang_Object comes next so that object_array_class can be created.
394 Handle<mirror::Class> java_lang_Object(hs.NewHandle(
395 AllocClass(self, java_lang_Class.Get(), mirror::Object::ClassSize(image_pointer_size_))));
396 CHECK(java_lang_Object.Get() != nullptr);
397 // backfill Object as the super class of Class.
398 java_lang_Class->SetSuperClass(java_lang_Object.Get());
399 mirror::Class::SetStatus(java_lang_Object, mirror::Class::kStatusLoaded, self);
401 java_lang_Object->SetObjectSize(sizeof(mirror::Object));
402 // Allocate in non-movable so that it's possible to check if a JNI weak global ref has been
403 // cleared without triggering the read barrier and unintentionally mark the sentinel alive.
404 runtime->SetSentinel(heap->AllocNonMovableObject<true>(self,
405 java_lang_Object.Get(),
406 java_lang_Object->GetObjectSize(),
409 // Object[] next to hold class roots.
410 Handle<mirror::Class> object_array_class(hs.NewHandle(
411 AllocClass(self, java_lang_Class.Get(),
412 mirror::ObjectArray<mirror::Object>::ClassSize(image_pointer_size_))));
413 object_array_class->SetComponentType(java_lang_Object.Get());
415 // Setup the char (primitive) class to be used for char[].
416 Handle<mirror::Class> char_class(hs.NewHandle(
417 AllocClass(self, java_lang_Class.Get(),
418 mirror::Class::PrimitiveClassSize(image_pointer_size_))));
419 // The primitive char class won't be initialized by
420 // InitializePrimitiveClass until line 459, but strings (and
421 // internal char arrays) will be allocated before that and the
422 // component size, which is computed from the primitive type, needs
424 char_class->SetPrimitiveType(Primitive::kPrimChar);
426 // Setup the char[] class to be used for String.
427 Handle<mirror::Class> char_array_class(hs.NewHandle(
428 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize(image_pointer_size_))));
429 char_array_class->SetComponentType(char_class.Get());
430 mirror::CharArray::SetArrayClass(char_array_class.Get());
433 Handle<mirror::Class> java_lang_String(hs.NewHandle(
434 AllocClass(self, java_lang_Class.Get(), mirror::String::ClassSize(image_pointer_size_))));
435 java_lang_String->SetStringClass();
436 mirror::String::SetClass(java_lang_String.Get());
437 mirror::Class::SetStatus(java_lang_String, mirror::Class::kStatusResolved, self);
439 // Setup java.lang.ref.Reference.
440 Handle<mirror::Class> java_lang_ref_Reference(hs.NewHandle(
441 AllocClass(self, java_lang_Class.Get(), mirror::Reference::ClassSize(image_pointer_size_))));
442 mirror::Reference::SetClass(java_lang_ref_Reference.Get());
443 java_lang_ref_Reference->SetObjectSize(mirror::Reference::InstanceSize());
444 mirror::Class::SetStatus(java_lang_ref_Reference, mirror::Class::kStatusResolved, self);
446 // Create storage for root classes, save away our work so far (requires descriptors).
447 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(
448 mirror::ObjectArray<mirror::Class>::Alloc(self, object_array_class.Get(),
450 CHECK(!class_roots_.IsNull());
451 SetClassRoot(kJavaLangClass, java_lang_Class.Get());
452 SetClassRoot(kJavaLangObject, java_lang_Object.Get());
453 SetClassRoot(kClassArrayClass, class_array_class.Get());
454 SetClassRoot(kObjectArrayClass, object_array_class.Get());
455 SetClassRoot(kCharArrayClass, char_array_class.Get());
456 SetClassRoot(kJavaLangString, java_lang_String.Get());
457 SetClassRoot(kJavaLangRefReference, java_lang_ref_Reference.Get());
459 // Setup the primitive type classes.
460 SetClassRoot(kPrimitiveBoolean, CreatePrimitiveClass(self, Primitive::kPrimBoolean));
461 SetClassRoot(kPrimitiveByte, CreatePrimitiveClass(self, Primitive::kPrimByte));
462 SetClassRoot(kPrimitiveShort, CreatePrimitiveClass(self, Primitive::kPrimShort));
463 SetClassRoot(kPrimitiveInt, CreatePrimitiveClass(self, Primitive::kPrimInt));
464 SetClassRoot(kPrimitiveLong, CreatePrimitiveClass(self, Primitive::kPrimLong));
465 SetClassRoot(kPrimitiveFloat, CreatePrimitiveClass(self, Primitive::kPrimFloat));
466 SetClassRoot(kPrimitiveDouble, CreatePrimitiveClass(self, Primitive::kPrimDouble));
467 SetClassRoot(kPrimitiveVoid, CreatePrimitiveClass(self, Primitive::kPrimVoid));
469 // Create array interface entries to populate once we can load system classes.
470 array_iftable_ = GcRoot<mirror::IfTable>(AllocIfTable(self, 2));
472 // Create int array type for AllocDexCache (done in AppendToBootClassPath).
473 Handle<mirror::Class> int_array_class(hs.NewHandle(
474 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize(image_pointer_size_))));
475 int_array_class->SetComponentType(GetClassRoot(kPrimitiveInt));
476 mirror::IntArray::SetArrayClass(int_array_class.Get());
477 SetClassRoot(kIntArrayClass, int_array_class.Get());
479 // Create long array type for AllocDexCache (done in AppendToBootClassPath).
480 Handle<mirror::Class> long_array_class(hs.NewHandle(
481 AllocClass(self, java_lang_Class.Get(), mirror::Array::ClassSize(image_pointer_size_))));
482 long_array_class->SetComponentType(GetClassRoot(kPrimitiveLong));
483 mirror::LongArray::SetArrayClass(long_array_class.Get());
484 SetClassRoot(kLongArrayClass, long_array_class.Get());
486 // now that these are registered, we can use AllocClass() and AllocObjectArray
488 // Set up DexCache. This cannot be done later since AppendToBootClassPath calls AllocDexCache.
489 Handle<mirror::Class> java_lang_DexCache(hs.NewHandle(
490 AllocClass(self, java_lang_Class.Get(), mirror::DexCache::ClassSize(image_pointer_size_))));
491 SetClassRoot(kJavaLangDexCache, java_lang_DexCache.Get());
492 java_lang_DexCache->SetDexCacheClass();
493 java_lang_DexCache->SetObjectSize(mirror::DexCache::InstanceSize());
494 mirror::Class::SetStatus(java_lang_DexCache, mirror::Class::kStatusResolved, self);
496 // Set up array classes for string, field, method
497 Handle<mirror::Class> object_array_string(hs.NewHandle(
498 AllocClass(self, java_lang_Class.Get(),
499 mirror::ObjectArray<mirror::String>::ClassSize(image_pointer_size_))));
500 object_array_string->SetComponentType(java_lang_String.Get());
501 SetClassRoot(kJavaLangStringArrayClass, object_array_string.Get());
503 LinearAlloc* linear_alloc = runtime->GetLinearAlloc();
504 // Create runtime resolution and imt conflict methods.
505 runtime->SetResolutionMethod(runtime->CreateResolutionMethod());
506 runtime->SetImtConflictMethod(runtime->CreateImtConflictMethod(linear_alloc));
507 runtime->SetImtUnimplementedMethod(runtime->CreateImtConflictMethod(linear_alloc));
509 // Setup boot_class_path_ and register class_path now that we can use AllocObjectArray to create
510 // DexCache instances. Needs to be after String, Field, Method arrays since AllocDexCache uses
512 if (boot_class_path.empty()) {
513 *error_msg = "Boot classpath is empty.";
516 for (auto& dex_file : boot_class_path) {
517 if (dex_file.get() == nullptr) {
518 *error_msg = "Null dex file.";
521 AppendToBootClassPath(self, *dex_file);
522 boot_dex_files_.push_back(std::move(dex_file));
525 // now we can use FindSystemClass
527 // run char class through InitializePrimitiveClass to finish init
528 InitializePrimitiveClass(char_class.Get(), Primitive::kPrimChar);
529 SetClassRoot(kPrimitiveChar, char_class.Get()); // needs descriptor
531 // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that
532 // we do not need friend classes or a publicly exposed setter.
533 quick_generic_jni_trampoline_ = GetQuickGenericJniStub();
534 if (!runtime->IsAotCompiler()) {
535 // We need to set up the generic trampolines since we don't have an image.
536 quick_resolution_trampoline_ = GetQuickResolutionStub();
537 quick_imt_conflict_trampoline_ = GetQuickImtConflictStub();
538 quick_to_interpreter_bridge_trampoline_ = GetQuickToInterpreterBridge();
541 // Object, String and DexCache need to be rerun through FindSystemClass to finish init
542 mirror::Class::SetStatus(java_lang_Object, mirror::Class::kStatusNotReady, self);
543 CheckSystemClass(self, java_lang_Object, "Ljava/lang/Object;");
544 CHECK_EQ(java_lang_Object->GetObjectSize(), mirror::Object::InstanceSize());
545 mirror::Class::SetStatus(java_lang_String, mirror::Class::kStatusNotReady, self);
546 CheckSystemClass(self, java_lang_String, "Ljava/lang/String;");
547 mirror::Class::SetStatus(java_lang_DexCache, mirror::Class::kStatusNotReady, self);
548 CheckSystemClass(self, java_lang_DexCache, "Ljava/lang/DexCache;");
549 CHECK_EQ(java_lang_DexCache->GetObjectSize(), mirror::DexCache::InstanceSize());
551 // Setup the primitive array type classes - can't be done until Object has a vtable.
552 SetClassRoot(kBooleanArrayClass, FindSystemClass(self, "[Z"));
553 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass));
555 SetClassRoot(kByteArrayClass, FindSystemClass(self, "[B"));
556 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass));
558 CheckSystemClass(self, char_array_class, "[C");
560 SetClassRoot(kShortArrayClass, FindSystemClass(self, "[S"));
561 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass));
563 CheckSystemClass(self, int_array_class, "[I");
564 CheckSystemClass(self, long_array_class, "[J");
566 SetClassRoot(kFloatArrayClass, FindSystemClass(self, "[F"));
567 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass));
569 SetClassRoot(kDoubleArrayClass, FindSystemClass(self, "[D"));
570 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass));
572 // Run Class through FindSystemClass. This initializes the dex_cache_ fields and register it
574 CheckSystemClass(self, java_lang_Class, "Ljava/lang/Class;");
576 CheckSystemClass(self, class_array_class, "[Ljava/lang/Class;");
577 CheckSystemClass(self, object_array_class, "[Ljava/lang/Object;");
579 // Setup the single, global copy of "iftable".
580 auto java_lang_Cloneable = hs.NewHandle(FindSystemClass(self, "Ljava/lang/Cloneable;"));
581 CHECK(java_lang_Cloneable.Get() != nullptr);
582 auto java_io_Serializable = hs.NewHandle(FindSystemClass(self, "Ljava/io/Serializable;"));
583 CHECK(java_io_Serializable.Get() != nullptr);
584 // We assume that Cloneable/Serializable don't have superinterfaces -- normally we'd have to
585 // crawl up and explicitly list all of the supers as well.
586 array_iftable_.Read()->SetInterface(0, java_lang_Cloneable.Get());
587 array_iftable_.Read()->SetInterface(1, java_io_Serializable.Get());
589 // Sanity check Class[] and Object[]'s interfaces. GetDirectInterface may cause thread
591 CHECK_EQ(java_lang_Cloneable.Get(),
592 mirror::Class::GetDirectInterface(self, class_array_class, 0));
593 CHECK_EQ(java_io_Serializable.Get(),
594 mirror::Class::GetDirectInterface(self, class_array_class, 1));
595 CHECK_EQ(java_lang_Cloneable.Get(),
596 mirror::Class::GetDirectInterface(self, object_array_class, 0));
597 CHECK_EQ(java_io_Serializable.Get(),
598 mirror::Class::GetDirectInterface(self, object_array_class, 1));
600 CHECK_EQ(object_array_string.Get(),
601 FindSystemClass(self, GetClassRootDescriptor(kJavaLangStringArrayClass)));
603 // End of special init trickery, all subsequent classes may be loaded via FindSystemClass.
605 // Create java.lang.reflect.Proxy root.
606 SetClassRoot(kJavaLangReflectProxy, FindSystemClass(self, "Ljava/lang/reflect/Proxy;"));
608 // Create java.lang.reflect.Field.class root.
609 auto* class_root = FindSystemClass(self, "Ljava/lang/reflect/Field;");
610 CHECK(class_root != nullptr);
611 SetClassRoot(kJavaLangReflectField, class_root);
612 mirror::Field::SetClass(class_root);
614 // Create java.lang.reflect.Field array root.
615 class_root = FindSystemClass(self, "[Ljava/lang/reflect/Field;");
616 CHECK(class_root != nullptr);
617 SetClassRoot(kJavaLangReflectFieldArrayClass, class_root);
618 mirror::Field::SetArrayClass(class_root);
620 // Create java.lang.reflect.Constructor.class root and array root.
621 class_root = FindSystemClass(self, "Ljava/lang/reflect/Constructor;");
622 CHECK(class_root != nullptr);
623 SetClassRoot(kJavaLangReflectConstructor, class_root);
624 mirror::Constructor::SetClass(class_root);
625 class_root = FindSystemClass(self, "[Ljava/lang/reflect/Constructor;");
626 CHECK(class_root != nullptr);
627 SetClassRoot(kJavaLangReflectConstructorArrayClass, class_root);
628 mirror::Constructor::SetArrayClass(class_root);
630 // Create java.lang.reflect.Method.class root and array root.
631 class_root = FindSystemClass(self, "Ljava/lang/reflect/Method;");
632 CHECK(class_root != nullptr);
633 SetClassRoot(kJavaLangReflectMethod, class_root);
634 mirror::Method::SetClass(class_root);
635 class_root = FindSystemClass(self, "[Ljava/lang/reflect/Method;");
636 CHECK(class_root != nullptr);
637 SetClassRoot(kJavaLangReflectMethodArrayClass, class_root);
638 mirror::Method::SetArrayClass(class_root);
640 // java.lang.ref classes need to be specially flagged, but otherwise are normal classes
641 // finish initializing Reference class
642 mirror::Class::SetStatus(java_lang_ref_Reference, mirror::Class::kStatusNotReady, self);
643 CheckSystemClass(self, java_lang_ref_Reference, "Ljava/lang/ref/Reference;");
644 CHECK_EQ(java_lang_ref_Reference->GetObjectSize(), mirror::Reference::InstanceSize());
645 CHECK_EQ(java_lang_ref_Reference->GetClassSize(),
646 mirror::Reference::ClassSize(image_pointer_size_));
647 class_root = FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;");
648 CHECK_EQ(class_root->GetClassFlags(), mirror::kClassFlagNormal);
649 class_root->SetClassFlags(class_root->GetClassFlags() | mirror::kClassFlagFinalizerReference);
650 class_root = FindSystemClass(self, "Ljava/lang/ref/PhantomReference;");
651 CHECK_EQ(class_root->GetClassFlags(), mirror::kClassFlagNormal);
652 class_root->SetClassFlags(class_root->GetClassFlags() | mirror::kClassFlagPhantomReference);
653 class_root = FindSystemClass(self, "Ljava/lang/ref/SoftReference;");
654 CHECK_EQ(class_root->GetClassFlags(), mirror::kClassFlagNormal);
655 class_root->SetClassFlags(class_root->GetClassFlags() | mirror::kClassFlagSoftReference);
656 class_root = FindSystemClass(self, "Ljava/lang/ref/WeakReference;");
657 CHECK_EQ(class_root->GetClassFlags(), mirror::kClassFlagNormal);
658 class_root->SetClassFlags(class_root->GetClassFlags() | mirror::kClassFlagWeakReference);
660 // Setup the ClassLoader, verifying the object_size_.
661 class_root = FindSystemClass(self, "Ljava/lang/ClassLoader;");
662 class_root->SetClassLoaderClass();
663 CHECK_EQ(class_root->GetObjectSize(), mirror::ClassLoader::InstanceSize());
664 SetClassRoot(kJavaLangClassLoader, class_root);
666 // Set up java.lang.Throwable, java.lang.ClassNotFoundException, and
667 // java.lang.StackTraceElement as a convenience.
668 SetClassRoot(kJavaLangThrowable, FindSystemClass(self, "Ljava/lang/Throwable;"));
669 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable));
670 SetClassRoot(kJavaLangClassNotFoundException,
671 FindSystemClass(self, "Ljava/lang/ClassNotFoundException;"));
672 SetClassRoot(kJavaLangStackTraceElement, FindSystemClass(self, "Ljava/lang/StackTraceElement;"));
673 SetClassRoot(kJavaLangStackTraceElementArrayClass,
674 FindSystemClass(self, "[Ljava/lang/StackTraceElement;"));
675 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement));
677 // Ensure void type is resolved in the core's dex cache so java.lang.Void is correctly
680 const DexFile& dex_file = java_lang_Object->GetDexFile();
681 const DexFile::TypeId* void_type_id = dex_file.FindTypeId("V");
682 CHECK(void_type_id != nullptr);
683 uint16_t void_type_idx = dex_file.GetIndexForTypeId(*void_type_id);
684 // Now we resolve void type so the dex cache contains it. We use java.lang.Object class
685 // as referrer so the used dex cache is core's one.
686 mirror::Class* resolved_type = ResolveType(dex_file, void_type_idx, java_lang_Object.Get());
687 CHECK_EQ(resolved_type, GetClassRoot(kPrimitiveVoid));
688 self->AssertNoPendingException();
691 // Create conflict tables that depend on the class linker.
692 runtime->FixupConflictTables();
696 VLOG(startup) << "ClassLinker::InitFromCompiler exiting";
701 void ClassLinker::FinishInit(Thread* self) {
702 VLOG(startup) << "ClassLinker::FinishInit entering";
704 // Let the heap know some key offsets into java.lang.ref instances
705 // Note: we hard code the field indexes here rather than using FindInstanceField
706 // as the types of the field can't be resolved prior to the runtime being
708 mirror::Class* java_lang_ref_Reference = GetClassRoot(kJavaLangRefReference);
709 mirror::Class* java_lang_ref_FinalizerReference =
710 FindSystemClass(self, "Ljava/lang/ref/FinalizerReference;");
712 ArtField* pendingNext = java_lang_ref_Reference->GetInstanceField(0);
713 CHECK_STREQ(pendingNext->GetName(), "pendingNext");
714 CHECK_STREQ(pendingNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;");
716 ArtField* queue = java_lang_ref_Reference->GetInstanceField(1);
717 CHECK_STREQ(queue->GetName(), "queue");
718 CHECK_STREQ(queue->GetTypeDescriptor(), "Ljava/lang/ref/ReferenceQueue;");
720 ArtField* queueNext = java_lang_ref_Reference->GetInstanceField(2);
721 CHECK_STREQ(queueNext->GetName(), "queueNext");
722 CHECK_STREQ(queueNext->GetTypeDescriptor(), "Ljava/lang/ref/Reference;");
724 ArtField* referent = java_lang_ref_Reference->GetInstanceField(3);
725 CHECK_STREQ(referent->GetName(), "referent");
726 CHECK_STREQ(referent->GetTypeDescriptor(), "Ljava/lang/Object;");
728 ArtField* zombie = java_lang_ref_FinalizerReference->GetInstanceField(2);
729 CHECK_STREQ(zombie->GetName(), "zombie");
730 CHECK_STREQ(zombie->GetTypeDescriptor(), "Ljava/lang/Object;");
732 // ensure all class_roots_ are initialized
733 for (size_t i = 0; i < kClassRootsMax; i++) {
734 ClassRoot class_root = static_cast<ClassRoot>(i);
735 mirror::Class* klass = GetClassRoot(class_root);
736 CHECK(klass != nullptr);
737 DCHECK(klass->IsArrayClass() || klass->IsPrimitive() || klass->GetDexCache() != nullptr);
738 // note SetClassRoot does additional validation.
739 // if possible add new checks there to catch errors early
742 CHECK(!array_iftable_.IsNull());
744 // disable the slow paths in FindClass and CreatePrimitiveClass now
745 // that Object, Class, and Object[] are setup
748 VLOG(startup) << "ClassLinker::FinishInit exiting";
751 void ClassLinker::RunRootClinits() {
752 Thread* self = Thread::Current();
753 for (size_t i = 0; i < ClassLinker::kClassRootsMax; ++i) {
754 mirror::Class* c = GetClassRoot(ClassRoot(i));
755 if (!c->IsArrayClass() && !c->IsPrimitive()) {
756 StackHandleScope<1> hs(self);
757 Handle<mirror::Class> h_class(hs.NewHandle(GetClassRoot(ClassRoot(i))));
758 EnsureInitialized(self, h_class, true, true);
759 self->AssertNoPendingException();
764 static void SanityCheckArtMethod(ArtMethod* m,
765 mirror::Class* expected_class,
766 const std::vector<gc::space::ImageSpace*>& spaces)
767 SHARED_REQUIRES(Locks::mutator_lock_) {
768 if (m->IsRuntimeMethod()) {
769 mirror::Class* declaring_class = m->GetDeclaringClassUnchecked();
770 CHECK(declaring_class == nullptr) << declaring_class << " " << PrettyMethod(m);
771 } else if (m->IsCopied()) {
772 CHECK(m->GetDeclaringClass() != nullptr) << PrettyMethod(m);
773 } else if (expected_class != nullptr) {
774 CHECK_EQ(m->GetDeclaringClassUnchecked(), expected_class) << PrettyMethod(m);
776 if (!spaces.empty()) {
777 bool contains = false;
778 for (gc::space::ImageSpace* space : spaces) {
779 auto& header = space->GetImageHeader();
780 size_t offset = reinterpret_cast<uint8_t*>(m) - space->Begin();
782 const ImageSection& methods = header.GetMethodsSection();
783 contains = contains || methods.Contains(offset);
785 const ImageSection& runtime_methods = header.GetRuntimeMethodsSection();
786 contains = contains || runtime_methods.Contains(offset);
788 CHECK(contains) << m << " not found";
792 static void SanityCheckArtMethodPointerArray(mirror::PointerArray* arr,
793 mirror::Class* expected_class,
795 const std::vector<gc::space::ImageSpace*>& spaces)
796 SHARED_REQUIRES(Locks::mutator_lock_) {
797 CHECK(arr != nullptr);
798 for (int32_t j = 0; j < arr->GetLength(); ++j) {
799 auto* method = arr->GetElementPtrSize<ArtMethod*>(j, pointer_size);
800 // expected_class == null means we are a dex cache.
801 if (expected_class != nullptr) {
802 CHECK(method != nullptr);
804 if (method != nullptr) {
805 SanityCheckArtMethod(method, expected_class, spaces);
810 static void SanityCheckArtMethodPointerArray(ArtMethod** arr,
813 const std::vector<gc::space::ImageSpace*>& spaces)
814 SHARED_REQUIRES(Locks::mutator_lock_) {
815 CHECK_EQ(arr != nullptr, size != 0u);
816 if (arr != nullptr) {
817 bool contains = false;
818 for (auto space : spaces) {
819 auto offset = reinterpret_cast<uint8_t*>(arr) - space->Begin();
820 if (space->GetImageHeader().GetImageSection(
821 ImageHeader::kSectionDexCacheArrays).Contains(offset)) {
828 for (size_t j = 0; j < size; ++j) {
829 ArtMethod* method = mirror::DexCache::GetElementPtrSize(arr, j, pointer_size);
830 // expected_class == null means we are a dex cache.
831 if (method != nullptr) {
832 SanityCheckArtMethod(method, nullptr, spaces);
837 static void SanityCheckObjectsCallback(mirror::Object* obj, void* arg ATTRIBUTE_UNUSED)
838 SHARED_REQUIRES(Locks::mutator_lock_) {
839 DCHECK(obj != nullptr);
840 CHECK(obj->GetClass() != nullptr) << "Null class in object " << obj;
841 CHECK(obj->GetClass()->GetClass() != nullptr) << "Null class class " << obj;
842 if (obj->IsClass()) {
843 auto klass = obj->AsClass();
844 for (ArtField& field : klass->GetIFields()) {
845 CHECK_EQ(field.GetDeclaringClass(), klass);
847 for (ArtField& field : klass->GetSFields()) {
848 CHECK_EQ(field.GetDeclaringClass(), klass);
850 auto* runtime = Runtime::Current();
851 auto image_spaces = runtime->GetHeap()->GetBootImageSpaces();
852 auto pointer_size = runtime->GetClassLinker()->GetImagePointerSize();
853 for (auto& m : klass->GetMethods(pointer_size)) {
854 SanityCheckArtMethod(&m, klass, image_spaces);
856 auto* vtable = klass->GetVTable();
857 if (vtable != nullptr) {
858 SanityCheckArtMethodPointerArray(vtable, nullptr, pointer_size, image_spaces);
860 if (klass->ShouldHaveImt()) {
861 ImTable* imt = klass->GetImt(pointer_size);
862 for (size_t i = 0; i < ImTable::kSize; ++i) {
863 SanityCheckArtMethod(imt->Get(i, pointer_size), nullptr, image_spaces);
866 if (klass->ShouldHaveEmbeddedVTable()) {
867 for (int32_t i = 0; i < klass->GetEmbeddedVTableLength(); ++i) {
868 SanityCheckArtMethod(klass->GetEmbeddedVTableEntry(i, pointer_size), nullptr, image_spaces);
871 auto* iftable = klass->GetIfTable();
872 if (iftable != nullptr) {
873 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) {
874 if (iftable->GetMethodArrayCount(i) > 0) {
875 SanityCheckArtMethodPointerArray(
876 iftable->GetMethodArray(i), nullptr, pointer_size, image_spaces);
883 // Set image methods' entry point to interpreter.
884 class SetInterpreterEntrypointArtMethodVisitor : public ArtMethodVisitor {
886 explicit SetInterpreterEntrypointArtMethodVisitor(size_t image_pointer_size)
887 : image_pointer_size_(image_pointer_size) {}
889 void Visit(ArtMethod* method) OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) {
890 if (kIsDebugBuild && !method->IsRuntimeMethod()) {
891 CHECK(method->GetDeclaringClass() != nullptr);
893 if (!method->IsNative() && !method->IsRuntimeMethod() && !method->IsResolutionMethod()) {
894 method->SetEntryPointFromQuickCompiledCodePtrSize(GetQuickToInterpreterBridge(),
895 image_pointer_size_);
900 const size_t image_pointer_size_;
902 DISALLOW_COPY_AND_ASSIGN(SetInterpreterEntrypointArtMethodVisitor);
905 struct TrampolineCheckData {
906 const void* quick_resolution_trampoline;
907 const void* quick_imt_conflict_trampoline;
908 const void* quick_generic_jni_trampoline;
909 const void* quick_to_interpreter_bridge_trampoline;
915 static void CheckTrampolines(mirror::Object* obj, void* arg) NO_THREAD_SAFETY_ANALYSIS {
916 if (obj->IsClass()) {
917 mirror::Class* klass = obj->AsClass();
918 TrampolineCheckData* d = reinterpret_cast<TrampolineCheckData*>(arg);
919 for (ArtMethod& m : klass->GetMethods(d->pointer_size)) {
920 const void* entrypoint = m.GetEntryPointFromQuickCompiledCodePtrSize(d->pointer_size);
921 if (entrypoint == d->quick_resolution_trampoline ||
922 entrypoint == d->quick_imt_conflict_trampoline ||
923 entrypoint == d->quick_generic_jni_trampoline ||
924 entrypoint == d->quick_to_interpreter_bridge_trampoline) {
933 bool ClassLinker::InitFromBootImage(std::string* error_msg) {
934 VLOG(startup) << __FUNCTION__ << " entering";
937 Runtime* const runtime = Runtime::Current();
938 Thread* const self = Thread::Current();
939 gc::Heap* const heap = runtime->GetHeap();
940 std::vector<gc::space::ImageSpace*> spaces = heap->GetBootImageSpaces();
941 CHECK(!spaces.empty());
942 image_pointer_size_ = spaces[0]->GetImageHeader().GetPointerSize();
943 if (!ValidPointerSize(image_pointer_size_)) {
944 *error_msg = StringPrintf("Invalid image pointer size: %zu", image_pointer_size_);
947 if (!runtime->IsAotCompiler()) {
948 // Only the Aot compiler supports having an image with a different pointer size than the
949 // runtime. This happens on the host for compiling 32 bit tests since we use a 64 bit libart
950 // compiler. We may also use 32 bit dex2oat on a system with 64 bit apps.
951 if (image_pointer_size_ != sizeof(void*)) {
952 *error_msg = StringPrintf("Runtime must use current image pointer size: %zu vs %zu",
958 dex_cache_boot_image_class_lookup_required_ = true;
959 std::vector<const OatFile*> oat_files =
960 runtime->GetOatFileManager().RegisterImageOatFiles(spaces);
961 DCHECK(!oat_files.empty());
962 const OatHeader& default_oat_header = oat_files[0]->GetOatHeader();
963 CHECK_EQ(default_oat_header.GetImageFileLocationOatChecksum(), 0U);
964 CHECK_EQ(default_oat_header.GetImageFileLocationOatDataBegin(), 0U);
965 const char* image_file_location = oat_files[0]->GetOatHeader().
966 GetStoreValueByKey(OatHeader::kImageLocationKey);
967 CHECK(image_file_location == nullptr || *image_file_location == 0);
968 quick_resolution_trampoline_ = default_oat_header.GetQuickResolutionTrampoline();
969 quick_imt_conflict_trampoline_ = default_oat_header.GetQuickImtConflictTrampoline();
970 quick_generic_jni_trampoline_ = default_oat_header.GetQuickGenericJniTrampoline();
971 quick_to_interpreter_bridge_trampoline_ = default_oat_header.GetQuickToInterpreterBridge();
973 // Check that the other images use the same trampoline.
974 for (size_t i = 1; i < oat_files.size(); ++i) {
975 const OatHeader& ith_oat_header = oat_files[i]->GetOatHeader();
976 const void* ith_quick_resolution_trampoline =
977 ith_oat_header.GetQuickResolutionTrampoline();
978 const void* ith_quick_imt_conflict_trampoline =
979 ith_oat_header.GetQuickImtConflictTrampoline();
980 const void* ith_quick_generic_jni_trampoline =
981 ith_oat_header.GetQuickGenericJniTrampoline();
982 const void* ith_quick_to_interpreter_bridge_trampoline =
983 ith_oat_header.GetQuickToInterpreterBridge();
984 if (ith_quick_resolution_trampoline != quick_resolution_trampoline_ ||
985 ith_quick_imt_conflict_trampoline != quick_imt_conflict_trampoline_ ||
986 ith_quick_generic_jni_trampoline != quick_generic_jni_trampoline_ ||
987 ith_quick_to_interpreter_bridge_trampoline != quick_to_interpreter_bridge_trampoline_) {
988 // Make sure that all methods in this image do not contain those trampolines as
989 // entrypoints. Otherwise the class-linker won't be able to work with a single set.
990 TrampolineCheckData data;
992 data.pointer_size = GetImagePointerSize();
993 data.quick_resolution_trampoline = ith_quick_resolution_trampoline;
994 data.quick_imt_conflict_trampoline = ith_quick_imt_conflict_trampoline;
995 data.quick_generic_jni_trampoline = ith_quick_generic_jni_trampoline;
996 data.quick_to_interpreter_bridge_trampoline = ith_quick_to_interpreter_bridge_trampoline;
997 ReaderMutexLock mu(self, *Locks::heap_bitmap_lock_);
998 spaces[i]->GetLiveBitmap()->Walk(CheckTrampolines, &data);
1000 ArtMethod* m = data.m;
1001 LOG(ERROR) << "Found a broken ArtMethod: " << PrettyMethod(m);
1002 *error_msg = "Found an ArtMethod with a bad entrypoint";
1009 class_roots_ = GcRoot<mirror::ObjectArray<mirror::Class>>(
1010 down_cast<mirror::ObjectArray<mirror::Class>*>(
1011 spaces[0]->GetImageHeader().GetImageRoot(ImageHeader::kClassRoots)));
1012 mirror::Class::SetClassClass(class_roots_.Read()->Get(kJavaLangClass));
1014 // Special case of setting up the String class early so that we can test arbitrary objects
1015 // as being Strings or not
1016 mirror::String::SetClass(GetClassRoot(kJavaLangString));
1018 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject);
1019 java_lang_Object->SetObjectSize(sizeof(mirror::Object));
1020 // Allocate in non-movable so that it's possible to check if a JNI weak global ref has been
1021 // cleared without triggering the read barrier and unintentionally mark the sentinel alive.
1022 runtime->SetSentinel(heap->AllocNonMovableObject<true>(
1023 self, java_lang_Object, java_lang_Object->GetObjectSize(), VoidFunctor()));
1025 // reinit array_iftable_ from any array class instance, they should be ==
1026 array_iftable_ = GcRoot<mirror::IfTable>(GetClassRoot(kObjectArrayClass)->GetIfTable());
1027 DCHECK_EQ(array_iftable_.Read(), GetClassRoot(kBooleanArrayClass)->GetIfTable());
1028 // String class root was set above
1029 mirror::Field::SetClass(GetClassRoot(kJavaLangReflectField));
1030 mirror::Field::SetArrayClass(GetClassRoot(kJavaLangReflectFieldArrayClass));
1031 mirror::Constructor::SetClass(GetClassRoot(kJavaLangReflectConstructor));
1032 mirror::Constructor::SetArrayClass(GetClassRoot(kJavaLangReflectConstructorArrayClass));
1033 mirror::Method::SetClass(GetClassRoot(kJavaLangReflectMethod));
1034 mirror::Method::SetArrayClass(GetClassRoot(kJavaLangReflectMethodArrayClass));
1035 mirror::Reference::SetClass(GetClassRoot(kJavaLangRefReference));
1036 mirror::BooleanArray::SetArrayClass(GetClassRoot(kBooleanArrayClass));
1037 mirror::ByteArray::SetArrayClass(GetClassRoot(kByteArrayClass));
1038 mirror::CharArray::SetArrayClass(GetClassRoot(kCharArrayClass));
1039 mirror::DoubleArray::SetArrayClass(GetClassRoot(kDoubleArrayClass));
1040 mirror::FloatArray::SetArrayClass(GetClassRoot(kFloatArrayClass));
1041 mirror::IntArray::SetArrayClass(GetClassRoot(kIntArrayClass));
1042 mirror::LongArray::SetArrayClass(GetClassRoot(kLongArrayClass));
1043 mirror::ShortArray::SetArrayClass(GetClassRoot(kShortArrayClass));
1044 mirror::Throwable::SetClass(GetClassRoot(kJavaLangThrowable));
1045 mirror::StackTraceElement::SetClass(GetClassRoot(kJavaLangStackTraceElement));
1047 for (gc::space::ImageSpace* image_space : spaces) {
1048 // Boot class loader, use a null handle.
1049 std::vector<std::unique_ptr<const DexFile>> dex_files;
1050 if (!AddImageSpace(image_space,
1051 ScopedNullHandle<mirror::ClassLoader>(),
1052 /*dex_elements*/nullptr,
1053 /*dex_location*/nullptr,
1058 // Append opened dex files at the end.
1059 boot_dex_files_.insert(boot_dex_files_.end(),
1060 std::make_move_iterator(dex_files.begin()),
1061 std::make_move_iterator(dex_files.end()));
1065 VLOG(startup) << __FUNCTION__ << " exiting";
1069 bool ClassLinker::IsBootClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
1070 mirror::ClassLoader* class_loader) {
1071 return class_loader == nullptr ||
1072 class_loader->GetClass() ==
1073 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader);
1076 static mirror::String* GetDexPathListElementName(ScopedObjectAccessUnchecked& soa,
1077 mirror::Object* element)
1078 SHARED_REQUIRES(Locks::mutator_lock_) {
1079 ArtField* const dex_file_field =
1080 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile);
1081 ArtField* const dex_file_name_field =
1082 soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_fileName);
1083 DCHECK(dex_file_field != nullptr);
1084 DCHECK(dex_file_name_field != nullptr);
1085 DCHECK(element != nullptr);
1086 CHECK_EQ(dex_file_field->GetDeclaringClass(), element->GetClass()) << PrettyTypeOf(element);
1087 mirror::Object* dex_file = dex_file_field->GetObject(element);
1088 if (dex_file == nullptr) {
1091 mirror::Object* const name_object = dex_file_name_field->GetObject(dex_file);
1092 if (name_object != nullptr) {
1093 return name_object->AsString();
1098 static bool FlattenPathClassLoader(mirror::ClassLoader* class_loader,
1099 std::list<mirror::String*>* out_dex_file_names,
1100 std::string* error_msg)
1101 SHARED_REQUIRES(Locks::mutator_lock_) {
1102 DCHECK(out_dex_file_names != nullptr);
1103 DCHECK(error_msg != nullptr);
1104 ScopedObjectAccessUnchecked soa(Thread::Current());
1105 ArtField* const dex_path_list_field =
1106 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList);
1107 ArtField* const dex_elements_field =
1108 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements);
1109 CHECK(dex_path_list_field != nullptr);
1110 CHECK(dex_elements_field != nullptr);
1111 while (!ClassLinker::IsBootClassLoader(soa, class_loader)) {
1112 if (class_loader->GetClass() !=
1113 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader)) {
1114 *error_msg = StringPrintf("Unknown class loader type %s", PrettyTypeOf(class_loader).c_str());
1115 // Unsupported class loader.
1118 mirror::Object* dex_path_list = dex_path_list_field->GetObject(class_loader);
1119 if (dex_path_list != nullptr) {
1120 // DexPathList has an array dexElements of Elements[] which each contain a dex file.
1121 mirror::Object* dex_elements_obj = dex_elements_field->GetObject(dex_path_list);
1122 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look
1123 // at the mCookie which is a DexFile vector.
1124 if (dex_elements_obj != nullptr) {
1125 mirror::ObjectArray<mirror::Object>* dex_elements =
1126 dex_elements_obj->AsObjectArray<mirror::Object>();
1127 // Reverse order since we insert the parent at the front.
1128 for (int32_t i = dex_elements->GetLength() - 1; i >= 0; --i) {
1129 mirror::Object* const element = dex_elements->GetWithoutChecks(i);
1130 if (element == nullptr) {
1131 *error_msg = StringPrintf("Null dex element at index %d", i);
1134 mirror::String* const name = GetDexPathListElementName(soa, element);
1135 if (name == nullptr) {
1136 *error_msg = StringPrintf("Null name for dex element at index %d", i);
1139 out_dex_file_names->push_front(name);
1143 class_loader = class_loader->GetParent();
1148 class FixupArtMethodArrayVisitor : public ArtMethodVisitor {
1150 explicit FixupArtMethodArrayVisitor(const ImageHeader& header) : header_(header) {}
1152 virtual void Visit(ArtMethod* method) SHARED_REQUIRES(Locks::mutator_lock_) {
1153 GcRoot<mirror::Class>* resolved_types = method->GetDexCacheResolvedTypes(sizeof(void*));
1154 const bool is_copied = method->IsCopied();
1155 if (resolved_types != nullptr) {
1156 bool in_image_space = false;
1157 if (kIsDebugBuild || is_copied) {
1158 in_image_space = header_.GetImageSection(ImageHeader::kSectionDexCacheArrays).Contains(
1159 reinterpret_cast<const uint8_t*>(resolved_types) - header_.GetImageBegin());
1161 // Must be in image space for non-miranda method.
1162 DCHECK(is_copied || in_image_space)
1163 << resolved_types << " is not in image starting at "
1164 << reinterpret_cast<void*>(header_.GetImageBegin());
1165 if (!is_copied || in_image_space) {
1166 // Go through the array so that we don't need to do a slow map lookup.
1167 method->SetDexCacheResolvedTypes(*reinterpret_cast<GcRoot<mirror::Class>**>(resolved_types),
1171 ArtMethod** resolved_methods = method->GetDexCacheResolvedMethods(sizeof(void*));
1172 if (resolved_methods != nullptr) {
1173 bool in_image_space = false;
1174 if (kIsDebugBuild || is_copied) {
1175 in_image_space = header_.GetImageSection(ImageHeader::kSectionDexCacheArrays).Contains(
1176 reinterpret_cast<const uint8_t*>(resolved_methods) - header_.GetImageBegin());
1178 // Must be in image space for non-miranda method.
1179 DCHECK(is_copied || in_image_space)
1180 << resolved_methods << " is not in image starting at "
1181 << reinterpret_cast<void*>(header_.GetImageBegin());
1182 if (!is_copied || in_image_space) {
1183 // Go through the array so that we don't need to do a slow map lookup.
1184 method->SetDexCacheResolvedMethods(*reinterpret_cast<ArtMethod***>(resolved_methods),
1191 const ImageHeader& header_;
1194 class VerifyClassInTableArtMethodVisitor : public ArtMethodVisitor {
1196 explicit VerifyClassInTableArtMethodVisitor(ClassTable* table) : table_(table) {}
1198 virtual void Visit(ArtMethod* method)
1199 SHARED_REQUIRES(Locks::mutator_lock_, Locks::classlinker_classes_lock_) {
1200 mirror::Class* klass = method->GetDeclaringClass();
1201 if (klass != nullptr && !Runtime::Current()->GetHeap()->ObjectIsInBootImageSpace(klass)) {
1202 CHECK_EQ(table_->LookupByDescriptor(klass), klass) << PrettyClass(klass);
1207 ClassTable* const table_;
1210 class VerifyDeclaringClassVisitor : public ArtMethodVisitor {
1212 VerifyDeclaringClassVisitor() SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_)
1213 : live_bitmap_(Runtime::Current()->GetHeap()->GetLiveBitmap()) {}
1215 virtual void Visit(ArtMethod* method)
1216 SHARED_REQUIRES(Locks::mutator_lock_, Locks::heap_bitmap_lock_) {
1217 mirror::Class* klass = method->GetDeclaringClassUnchecked();
1218 if (klass != nullptr) {
1219 CHECK(live_bitmap_->Test(klass)) << "Image method has unmarked declaring class";
1224 gc::accounting::HeapBitmap* const live_bitmap_;
1227 bool ClassLinker::UpdateAppImageClassLoadersAndDexCaches(
1228 gc::space::ImageSpace* space,
1229 Handle<mirror::ClassLoader> class_loader,
1230 Handle<mirror::ObjectArray<mirror::DexCache>> dex_caches,
1231 ClassTable::ClassSet* new_class_set,
1232 bool* out_forward_dex_cache_array,
1233 std::string* out_error_msg) {
1234 DCHECK(out_forward_dex_cache_array != nullptr);
1235 DCHECK(out_error_msg != nullptr);
1236 Thread* const self = Thread::Current();
1237 gc::Heap* const heap = Runtime::Current()->GetHeap();
1238 const ImageHeader& header = space->GetImageHeader();
1240 // Add image classes into the class table for the class loader, and fixup the dex caches and
1241 // class loader fields.
1242 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
1243 ClassTable* table = InsertClassTableForClassLoader(class_loader.Get());
1244 // Dex cache array fixup is all or nothing, we must reject app images that have mixed since we
1245 // rely on clobering the dex cache arrays in the image to forward to bss.
1246 size_t num_dex_caches_with_bss_arrays = 0;
1247 const size_t num_dex_caches = dex_caches->GetLength();
1248 for (size_t i = 0; i < num_dex_caches; i++) {
1249 mirror::DexCache* const dex_cache = dex_caches->Get(i);
1250 const DexFile* const dex_file = dex_cache->GetDexFile();
1251 const OatFile::OatDexFile* oat_dex_file = dex_file->GetOatDexFile();
1252 if (oat_dex_file != nullptr && oat_dex_file->GetDexCacheArrays() != nullptr) {
1253 ++num_dex_caches_with_bss_arrays;
1256 *out_forward_dex_cache_array = num_dex_caches_with_bss_arrays != 0;
1257 if (*out_forward_dex_cache_array) {
1258 if (num_dex_caches_with_bss_arrays != num_dex_caches) {
1259 // Reject application image since we cannot forward only some of the dex cache arrays.
1260 // TODO: We could get around this by having a dedicated forwarding slot. It should be an
1262 *out_error_msg = StringPrintf("Dex caches in bss does not match total: %zu vs %zu",
1263 num_dex_caches_with_bss_arrays,
1268 // Only add the classes to the class loader after the points where we can return false.
1269 for (size_t i = 0; i < num_dex_caches; i++) {
1270 mirror::DexCache* const dex_cache = dex_caches->Get(i);
1271 const DexFile* const dex_file = dex_cache->GetDexFile();
1272 const OatFile::OatDexFile* oat_dex_file = dex_file->GetOatDexFile();
1273 if (oat_dex_file != nullptr && oat_dex_file->GetDexCacheArrays() != nullptr) {
1274 // If the oat file expects the dex cache arrays to be in the BSS, then allocate there and
1275 // copy over the arrays.
1276 DCHECK(dex_file != nullptr);
1277 const size_t num_strings = dex_file->NumStringIds();
1278 const size_t num_types = dex_file->NumTypeIds();
1279 const size_t num_methods = dex_file->NumMethodIds();
1280 const size_t num_fields = dex_file->NumFieldIds();
1281 CHECK_EQ(num_strings, dex_cache->NumStrings());
1282 CHECK_EQ(num_types, dex_cache->NumResolvedTypes());
1283 CHECK_EQ(num_methods, dex_cache->NumResolvedMethods());
1284 CHECK_EQ(num_fields, dex_cache->NumResolvedFields());
1285 DexCacheArraysLayout layout(image_pointer_size_, dex_file);
1286 uint8_t* const raw_arrays = oat_dex_file->GetDexCacheArrays();
1287 // The space is not yet visible to the GC, we can avoid the read barriers and use
1289 if (num_strings != 0u) {
1290 GcRoot<mirror::String>* const image_resolved_strings = dex_cache->GetStrings();
1291 GcRoot<mirror::String>* const strings =
1292 reinterpret_cast<GcRoot<mirror::String>*>(raw_arrays + layout.StringsOffset());
1293 for (size_t j = 0; kIsDebugBuild && j < num_strings; ++j) {
1294 DCHECK(strings[j].IsNull());
1296 std::copy_n(image_resolved_strings, num_strings, strings);
1297 dex_cache->SetStrings(strings);
1299 if (num_types != 0u) {
1300 GcRoot<mirror::Class>* const image_resolved_types = dex_cache->GetResolvedTypes();
1301 GcRoot<mirror::Class>* const types =
1302 reinterpret_cast<GcRoot<mirror::Class>*>(raw_arrays + layout.TypesOffset());
1303 for (size_t j = 0; kIsDebugBuild && j < num_types; ++j) {
1304 DCHECK(types[j].IsNull());
1306 std::copy_n(image_resolved_types, num_types, types);
1307 // Store a pointer to the new location for fast ArtMethod patching without requiring map.
1308 // This leaves random garbage at the start of the dex cache array, but nobody should ever
1309 // read from it again.
1310 *reinterpret_cast<GcRoot<mirror::Class>**>(image_resolved_types) = types;
1311 dex_cache->SetResolvedTypes(types);
1313 if (num_methods != 0u) {
1314 ArtMethod** const methods = reinterpret_cast<ArtMethod**>(
1315 raw_arrays + layout.MethodsOffset());
1316 ArtMethod** const image_resolved_methods = dex_cache->GetResolvedMethods();
1317 for (size_t j = 0; kIsDebugBuild && j < num_methods; ++j) {
1318 DCHECK(methods[j] == nullptr);
1320 std::copy_n(image_resolved_methods, num_methods, methods);
1321 // Store a pointer to the new location for fast ArtMethod patching without requiring map.
1322 *reinterpret_cast<ArtMethod***>(image_resolved_methods) = methods;
1323 dex_cache->SetResolvedMethods(methods);
1325 if (num_fields != 0u) {
1326 ArtField** const fields =
1327 reinterpret_cast<ArtField**>(raw_arrays + layout.FieldsOffset());
1328 for (size_t j = 0; kIsDebugBuild && j < num_fields; ++j) {
1329 DCHECK(fields[j] == nullptr);
1331 std::copy_n(dex_cache->GetResolvedFields(), num_fields, fields);
1332 dex_cache->SetResolvedFields(fields);
1336 WriterMutexLock mu2(self, dex_lock_);
1337 // Make sure to do this after we update the arrays since we store the resolved types array
1338 // in DexCacheData in RegisterDexFileLocked. We need the array pointer to be the one in the
1340 mirror::DexCache* existing_dex_cache = FindDexCacheLocked(self,
1342 /*allow_failure*/true);
1343 CHECK(existing_dex_cache == nullptr);
1344 StackHandleScope<1> hs3(self);
1345 RegisterDexFileLocked(*dex_file, hs3.NewHandle(dex_cache));
1347 GcRoot<mirror::Class>* const types = dex_cache->GetResolvedTypes();
1348 const size_t num_types = dex_cache->NumResolvedTypes();
1349 if (new_class_set == nullptr) {
1350 for (int32_t j = 0; j < static_cast<int32_t>(num_types); j++) {
1351 // The image space is not yet added to the heap, avoid read barriers.
1352 mirror::Class* klass = types[j].Read();
1353 // There may also be boot image classes,
1354 if (space->HasAddress(klass)) {
1355 DCHECK_NE(klass->GetStatus(), mirror::Class::kStatusError);
1356 // Update the class loader from the one in the image class loader to the one that loaded
1358 klass->SetClassLoader(class_loader.Get());
1359 // The resolved type could be from another dex cache, go through the dex cache just in
1360 // case. May be null for array classes.
1361 if (klass->GetDexCacheStrings() != nullptr) {
1362 DCHECK(!klass->IsArrayClass());
1363 klass->SetDexCacheStrings(klass->GetDexCache()->GetStrings());
1365 // If there are multiple dex caches, there may be the same class multiple times
1366 // in different dex caches. Check for this since inserting will add duplicates
1368 if (num_dex_caches > 1) {
1369 mirror::Class* existing = table->LookupByDescriptor(klass);
1370 if (existing != nullptr) {
1371 DCHECK_EQ(existing, klass) << PrettyClass(klass);
1373 table->Insert(klass);
1376 table->Insert(klass);
1378 // Double checked VLOG to avoid overhead.
1379 if (VLOG_IS_ON(image)) {
1380 VLOG(image) << PrettyClass(klass) << " " << klass->GetStatus();
1381 if (!klass->IsArrayClass()) {
1382 VLOG(image) << "From " << klass->GetDexCache()->GetDexFile()->GetBaseLocation();
1384 VLOG(image) << "Direct methods";
1385 for (ArtMethod& m : klass->GetDirectMethods(sizeof(void*))) {
1386 VLOG(image) << PrettyMethod(&m);
1388 VLOG(image) << "Virtual methods";
1389 for (ArtMethod& m : klass->GetVirtualMethods(sizeof(void*))) {
1390 VLOG(image) << PrettyMethod(&m);
1394 DCHECK(klass == nullptr || heap->ObjectIsInBootImageSpace(klass))
1395 << klass << " " << PrettyClass(klass);
1399 if (kIsDebugBuild) {
1400 for (int32_t j = 0; j < static_cast<int32_t>(num_types); j++) {
1401 // The image space is not yet added to the heap, avoid read barriers.
1402 mirror::Class* klass = types[j].Read();
1403 if (space->HasAddress(klass)) {
1404 DCHECK_NE(klass->GetStatus(), mirror::Class::kStatusError);
1405 if (kIsDebugBuild) {
1406 if (new_class_set != nullptr) {
1407 auto it = new_class_set->Find(GcRoot<mirror::Class>(klass));
1408 DCHECK(it != new_class_set->end());
1409 DCHECK_EQ(it->Read(), klass);
1410 mirror::Class* super_class = klass->GetSuperClass();
1411 if (super_class != nullptr && !heap->ObjectIsInBootImageSpace(super_class)) {
1412 auto it2 = new_class_set->Find(GcRoot<mirror::Class>(super_class));
1413 DCHECK(it2 != new_class_set->end());
1414 DCHECK_EQ(it2->Read(), super_class);
1417 DCHECK_EQ(table->LookupByDescriptor(klass), klass);
1418 mirror::Class* super_class = klass->GetSuperClass();
1419 if (super_class != nullptr && !heap->ObjectIsInBootImageSpace(super_class)) {
1420 CHECK_EQ(table->LookupByDescriptor(super_class), super_class);
1424 if (kIsDebugBuild) {
1425 for (ArtMethod& m : klass->GetDirectMethods(sizeof(void*))) {
1426 const void* code = m.GetEntryPointFromQuickCompiledCode();
1427 const void* oat_code = m.IsInvokable() ? GetQuickOatCodeFor(&m) : code;
1428 if (!IsQuickResolutionStub(code) &&
1429 !IsQuickGenericJniStub(code) &&
1430 !IsQuickToInterpreterBridge(code) &&
1432 DCHECK_EQ(code, oat_code) << PrettyMethod(&m);
1435 for (ArtMethod& m : klass->GetVirtualMethods(sizeof(void*))) {
1436 const void* code = m.GetEntryPointFromQuickCompiledCode();
1437 const void* oat_code = m.IsInvokable() ? GetQuickOatCodeFor(&m) : code;
1438 if (!IsQuickResolutionStub(code) &&
1439 !IsQuickGenericJniStub(code) &&
1440 !IsQuickToInterpreterBridge(code) &&
1442 DCHECK_EQ(code, oat_code) << PrettyMethod(&m);
1451 if (*out_forward_dex_cache_array) {
1452 ScopedTrace timing("Fixup ArtMethod dex cache arrays");
1453 FixupArtMethodArrayVisitor visitor(header);
1454 header.VisitPackedArtMethods(&visitor, space->Begin(), sizeof(void*));
1455 Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(class_loader.Get());
1457 if (kVerifyArtMethodDeclaringClasses) {
1458 ScopedTrace timing("Verify declaring classes");
1459 ReaderMutexLock rmu(self, *Locks::heap_bitmap_lock_);
1460 VerifyDeclaringClassVisitor visitor;
1461 header.VisitPackedArtMethods(&visitor, space->Begin(), sizeof(void*));
1466 // Update the class loader and resolved string dex cache array of classes. Should only be used on
1467 // classes in the image space.
1468 class UpdateClassLoaderAndResolvedStringsVisitor {
1470 UpdateClassLoaderAndResolvedStringsVisitor(gc::space::ImageSpace* space,
1471 mirror::ClassLoader* class_loader,
1472 bool forward_strings)
1474 class_loader_(class_loader),
1475 forward_strings_(forward_strings) {}
1477 bool operator()(mirror::Class* klass) const SHARED_REQUIRES(Locks::mutator_lock_) {
1478 if (forward_strings_) {
1479 GcRoot<mirror::String>* strings = klass->GetDexCacheStrings();
1480 if (strings != nullptr) {
1482 space_->GetImageHeader().GetImageSection(ImageHeader::kSectionDexCacheArrays).Contains(
1483 reinterpret_cast<uint8_t*>(strings) - space_->Begin()))
1484 << "String dex cache array for " << PrettyClass(klass) << " is not in app image";
1485 // Dex caches have already been updated, so take the strings pointer from there.
1486 GcRoot<mirror::String>* new_strings = klass->GetDexCache()->GetStrings();
1487 DCHECK_NE(strings, new_strings);
1488 klass->SetDexCacheStrings(new_strings);
1491 // Finally, update class loader.
1492 klass->SetClassLoader(class_loader_);
1496 gc::space::ImageSpace* const space_;
1497 mirror::ClassLoader* const class_loader_;
1498 const bool forward_strings_;
1501 static std::unique_ptr<const DexFile> OpenOatDexFile(const OatFile* oat_file,
1502 const char* location,
1503 std::string* error_msg)
1504 SHARED_REQUIRES(Locks::mutator_lock_) {
1505 DCHECK(error_msg != nullptr);
1506 std::unique_ptr<const DexFile> dex_file;
1507 const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(location, nullptr);
1508 if (oat_dex_file == nullptr) {
1509 *error_msg = StringPrintf("Failed finding oat dex file for %s %s",
1510 oat_file->GetLocation().c_str(),
1512 return std::unique_ptr<const DexFile>();
1514 std::string inner_error_msg;
1515 dex_file = oat_dex_file->OpenDexFile(&inner_error_msg);
1516 if (dex_file == nullptr) {
1517 *error_msg = StringPrintf("Failed to open dex file %s from within oat file %s error '%s'",
1519 oat_file->GetLocation().c_str(),
1520 inner_error_msg.c_str());
1521 return std::unique_ptr<const DexFile>();
1524 if (dex_file->GetLocationChecksum() != oat_dex_file->GetDexFileLocationChecksum()) {
1525 *error_msg = StringPrintf("Checksums do not match for %s: %x vs %x",
1527 dex_file->GetLocationChecksum(),
1528 oat_dex_file->GetDexFileLocationChecksum());
1529 return std::unique_ptr<const DexFile>();
1534 bool ClassLinker::OpenImageDexFiles(gc::space::ImageSpace* space,
1535 std::vector<std::unique_ptr<const DexFile>>* out_dex_files,
1536 std::string* error_msg) {
1537 ScopedAssertNoThreadSuspension nts(Thread::Current(), __FUNCTION__);
1538 const ImageHeader& header = space->GetImageHeader();
1539 mirror::Object* dex_caches_object = header.GetImageRoot(ImageHeader::kDexCaches);
1540 DCHECK(dex_caches_object != nullptr);
1541 mirror::ObjectArray<mirror::DexCache>* dex_caches =
1542 dex_caches_object->AsObjectArray<mirror::DexCache>();
1543 const OatFile* oat_file = space->GetOatFile();
1544 for (int32_t i = 0; i < dex_caches->GetLength(); i++) {
1545 mirror::DexCache* dex_cache = dex_caches->Get(i);
1546 std::string dex_file_location(dex_cache->GetLocation()->ToModifiedUtf8());
1547 std::unique_ptr<const DexFile> dex_file = OpenOatDexFile(oat_file,
1548 dex_file_location.c_str(),
1550 if (dex_file == nullptr) {
1553 dex_cache->SetDexFile(dex_file.get());
1554 out_dex_files->push_back(std::move(dex_file));
1559 bool ClassLinker::AddImageSpace(
1560 gc::space::ImageSpace* space,
1561 Handle<mirror::ClassLoader> class_loader,
1562 jobjectArray dex_elements,
1563 const char* dex_location,
1564 std::vector<std::unique_ptr<const DexFile>>* out_dex_files,
1565 std::string* error_msg) {
1566 DCHECK(out_dex_files != nullptr);
1567 DCHECK(error_msg != nullptr);
1568 const uint64_t start_time = NanoTime();
1569 const bool app_image = class_loader.Get() != nullptr;
1570 const ImageHeader& header = space->GetImageHeader();
1571 mirror::Object* dex_caches_object = header.GetImageRoot(ImageHeader::kDexCaches);
1572 DCHECK(dex_caches_object != nullptr);
1573 Runtime* const runtime = Runtime::Current();
1574 gc::Heap* const heap = runtime->GetHeap();
1575 Thread* const self = Thread::Current();
1576 StackHandleScope<2> hs(self);
1577 Handle<mirror::ObjectArray<mirror::DexCache>> dex_caches(
1578 hs.NewHandle(dex_caches_object->AsObjectArray<mirror::DexCache>()));
1579 Handle<mirror::ObjectArray<mirror::Class>> class_roots(hs.NewHandle(
1580 header.GetImageRoot(ImageHeader::kClassRoots)->AsObjectArray<mirror::Class>()));
1581 const OatFile* oat_file = space->GetOatFile();
1582 std::unordered_set<mirror::ClassLoader*> image_class_loaders;
1583 // Check that the image is what we are expecting.
1584 if (image_pointer_size_ != space->GetImageHeader().GetPointerSize()) {
1585 *error_msg = StringPrintf("Application image pointer size does not match runtime: %zu vs %zu",
1586 static_cast<size_t>(space->GetImageHeader().GetPointerSize()),
1587 image_pointer_size_);
1590 DCHECK(class_roots.Get() != nullptr);
1591 if (class_roots->GetLength() != static_cast<int32_t>(kClassRootsMax)) {
1592 *error_msg = StringPrintf("Expected %d class roots but got %d",
1593 class_roots->GetLength(),
1594 static_cast<int32_t>(kClassRootsMax));
1597 // Check against existing class roots to make sure they match the ones in the boot image.
1598 for (size_t i = 0; i < kClassRootsMax; i++) {
1599 if (class_roots->Get(i) != GetClassRoot(static_cast<ClassRoot>(i))) {
1600 *error_msg = "App image class roots must have pointer equality with runtime ones.";
1604 if (oat_file->GetOatHeader().GetDexFileCount() !=
1605 static_cast<uint32_t>(dex_caches->GetLength())) {
1606 *error_msg = "Dex cache count and dex file count mismatch while trying to initialize from "
1611 StackHandleScope<1> hs2(self);
1612 MutableHandle<mirror::DexCache> h_dex_cache(hs2.NewHandle<mirror::DexCache>(nullptr));
1613 for (int32_t i = 0; i < dex_caches->GetLength(); i++) {
1614 h_dex_cache.Assign(dex_caches->Get(i));
1615 std::string dex_file_location(h_dex_cache->GetLocation()->ToModifiedUtf8());
1616 // TODO: Only store qualified paths.
1617 // If non qualified, qualify it.
1618 if (dex_file_location.find('/') == std::string::npos) {
1619 std::string dex_location_path = dex_location;
1620 const size_t pos = dex_location_path.find_last_of('/');
1621 CHECK_NE(pos, std::string::npos);
1622 dex_location_path = dex_location_path.substr(0, pos + 1); // Keep trailing '/'
1623 dex_file_location = dex_location_path + dex_file_location;
1625 std::unique_ptr<const DexFile> dex_file = OpenOatDexFile(oat_file,
1626 dex_file_location.c_str(),
1628 if (dex_file == nullptr) {
1633 // The current dex file field is bogus, overwrite it so that we can get the dex file in the
1635 h_dex_cache->SetDexFile(dex_file.get());
1636 // Check that each class loader resolved the same way.
1637 // TODO: Store image class loaders as image roots.
1638 GcRoot<mirror::Class>* const types = h_dex_cache->GetResolvedTypes();
1639 for (int32_t j = 0, num_types = h_dex_cache->NumResolvedTypes(); j < num_types; j++) {
1640 mirror::Class* klass = types[j].Read();
1641 if (klass != nullptr) {
1642 DCHECK_NE(klass->GetStatus(), mirror::Class::kStatusError);
1643 mirror::ClassLoader* image_class_loader = klass->GetClassLoader();
1644 image_class_loaders.insert(image_class_loader);
1648 if (kSanityCheckObjects) {
1649 SanityCheckArtMethodPointerArray(h_dex_cache->GetResolvedMethods(),
1650 h_dex_cache->NumResolvedMethods(),
1651 image_pointer_size_,
1652 heap->GetBootImageSpaces());
1654 // Register dex files, keep track of existing ones that are conflicts.
1655 AppendToBootClassPath(*dex_file.get(), h_dex_cache);
1657 out_dex_files->push_back(std::move(dex_file));
1661 ScopedObjectAccessUnchecked soa(Thread::Current());
1662 // Check that the class loader resolves the same way as the ones in the image.
1663 // Image class loader [A][B][C][image dex files]
1664 // Class loader = [???][dex_elements][image dex files]
1665 // Need to ensure that [???][dex_elements] == [A][B][C].
1666 // For each class loader, PathClassLoader, the laoder checks the parent first. Also the logic
1667 // for PathClassLoader does this by looping through the array of dex files. To ensure they
1668 // resolve the same way, simply flatten the hierarchy in the way the resolution order would be,
1669 // and check that the dex file names are the same.
1670 for (mirror::ClassLoader* image_class_loader : image_class_loaders) {
1671 if (IsBootClassLoader(soa, image_class_loader)) {
1672 // The dex cache can reference types from the boot class loader.
1675 std::list<mirror::String*> image_dex_file_names;
1676 std::string temp_error_msg;
1677 if (!FlattenPathClassLoader(image_class_loader, &image_dex_file_names, &temp_error_msg)) {
1678 *error_msg = StringPrintf("Failed to flatten image class loader hierarchy '%s'",
1679 temp_error_msg.c_str());
1682 std::list<mirror::String*> loader_dex_file_names;
1683 if (!FlattenPathClassLoader(class_loader.Get(), &loader_dex_file_names, &temp_error_msg)) {
1684 *error_msg = StringPrintf("Failed to flatten class loader hierarchy '%s'",
1685 temp_error_msg.c_str());
1688 // Add the temporary dex path list elements at the end.
1689 auto* elements = soa.Decode<mirror::ObjectArray<mirror::Object>*>(dex_elements);
1690 for (size_t i = 0, num_elems = elements->GetLength(); i < num_elems; ++i) {
1691 mirror::Object* element = elements->GetWithoutChecks(i);
1692 if (element != nullptr) {
1693 // If we are somewhere in the middle of the array, there may be nulls at the end.
1694 loader_dex_file_names.push_back(GetDexPathListElementName(soa, element));
1697 // Ignore the number of image dex files since we are adding those to the class loader anyways.
1698 CHECK_GE(static_cast<size_t>(image_dex_file_names.size()),
1699 static_cast<size_t>(dex_caches->GetLength()));
1700 size_t image_count = image_dex_file_names.size() - dex_caches->GetLength();
1701 // Check that the dex file names match.
1702 bool equal = image_count == loader_dex_file_names.size();
1704 auto it1 = image_dex_file_names.begin();
1705 auto it2 = loader_dex_file_names.begin();
1706 for (size_t i = 0; equal && i < image_count; ++i, ++it1, ++it2) {
1707 equal = equal && (*it1)->Equals(*it2);
1711 VLOG(image) << "Image dex files " << image_dex_file_names.size();
1712 for (mirror::String* name : image_dex_file_names) {
1713 VLOG(image) << name->ToModifiedUtf8();
1715 VLOG(image) << "Loader dex files " << loader_dex_file_names.size();
1716 for (mirror::String* name : loader_dex_file_names) {
1717 VLOG(image) << name->ToModifiedUtf8();
1719 *error_msg = "Rejecting application image due to class loader mismatch";
1720 // Ignore class loader mismatch for now since these would just use possibly incorrect
1721 // oat code anyways. The structural class check should be done in the parent.
1726 if (kSanityCheckObjects) {
1727 for (int32_t i = 0; i < dex_caches->GetLength(); i++) {
1728 auto* dex_cache = dex_caches->Get(i);
1729 for (size_t j = 0; j < dex_cache->NumResolvedFields(); ++j) {
1730 auto* field = dex_cache->GetResolvedField(j, image_pointer_size_);
1731 if (field != nullptr) {
1732 CHECK(field->GetDeclaringClass()->GetClass() != nullptr);
1737 heap->VisitObjects(SanityCheckObjectsCallback, nullptr);
1741 // Set entry point to interpreter if in InterpretOnly mode.
1742 if (!runtime->IsAotCompiler() && runtime->GetInstrumentation()->InterpretOnly()) {
1743 SetInterpreterEntrypointArtMethodVisitor visitor(image_pointer_size_);
1744 header.VisitPackedArtMethods(&visitor, space->Begin(), image_pointer_size_);
1747 ClassTable* class_table = nullptr;
1749 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
1750 class_table = InsertClassTableForClassLoader(class_loader.Get());
1752 // If we have a class table section, read it and use it for verification in
1753 // UpdateAppImageClassLoadersAndDexCaches.
1754 ClassTable::ClassSet temp_set;
1755 const ImageSection& class_table_section = header.GetImageSection(ImageHeader::kSectionClassTable);
1756 const bool added_class_table = class_table_section.Size() > 0u;
1757 if (added_class_table) {
1758 const uint64_t start_time2 = NanoTime();
1759 size_t read_count = 0;
1760 temp_set = ClassTable::ClassSet(space->Begin() + class_table_section.Offset(),
1764 dex_cache_boot_image_class_lookup_required_ = false;
1766 VLOG(image) << "Adding class table classes took " << PrettyDuration(NanoTime() - start_time2);
1769 bool forward_dex_cache_arrays = false;
1770 if (!UpdateAppImageClassLoadersAndDexCaches(space,
1773 added_class_table ? &temp_set : nullptr,
1774 /*out*/&forward_dex_cache_arrays,
1775 /*out*/error_msg)) {
1778 // Update class loader and resolved strings. If added_class_table is false, the resolved
1779 // strings were forwarded UpdateAppImageClassLoadersAndDexCaches.
1780 UpdateClassLoaderAndResolvedStringsVisitor visitor(space,
1782 forward_dex_cache_arrays);
1783 if (added_class_table) {
1784 for (GcRoot<mirror::Class>& root : temp_set) {
1785 visitor(root.Read());
1788 // forward_dex_cache_arrays is true iff we copied all of the dex cache arrays into the .bss.
1789 // In this case, madvise away the dex cache arrays section of the image to reduce RAM usage and
1790 // mark as PROT_NONE to catch any invalid accesses.
1791 if (forward_dex_cache_arrays) {
1792 const ImageSection& dex_cache_section = header.GetImageSection(
1793 ImageHeader::kSectionDexCacheArrays);
1794 uint8_t* section_begin = AlignUp(space->Begin() + dex_cache_section.Offset(), kPageSize);
1795 uint8_t* section_end = AlignDown(space->Begin() + dex_cache_section.End(), kPageSize);
1796 if (section_begin < section_end) {
1797 madvise(section_begin, section_end - section_begin, MADV_DONTNEED);
1798 mprotect(section_begin, section_end - section_begin, PROT_NONE);
1799 VLOG(image) << "Released and protected dex cache array image section from "
1800 << reinterpret_cast<const void*>(section_begin) << "-"
1801 << reinterpret_cast<const void*>(section_end);
1805 if (added_class_table) {
1806 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
1807 class_table->AddClassSet(std::move(temp_set));
1809 if (kIsDebugBuild && app_image) {
1810 // This verification needs to happen after the classes have been added to the class loader.
1811 // Since it ensures classes are in the class table.
1812 VerifyClassInTableArtMethodVisitor visitor2(class_table);
1813 header.VisitPackedArtMethods(&visitor2, space->Begin(), sizeof(void*));
1815 VLOG(class_linker) << "Adding image space took " << PrettyDuration(NanoTime() - start_time);
1819 bool ClassLinker::ClassInClassTable(mirror::Class* klass) {
1820 ClassTable* const class_table = ClassTableForClassLoader(klass->GetClassLoader());
1821 return class_table != nullptr && class_table->Contains(klass);
1824 void ClassLinker::VisitClassRoots(RootVisitor* visitor, VisitRootFlags flags) {
1825 // Acquire tracing_enabled before locking class linker lock to prevent lock order violation. Since
1826 // enabling tracing requires the mutator lock, there are no race conditions here.
1827 const bool tracing_enabled = Trace::IsTracingEnabled();
1828 Thread* const self = Thread::Current();
1829 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
1830 BufferedRootVisitor<kDefaultBufferedRootCount> buffered_visitor(
1831 visitor, RootInfo(kRootStickyClass));
1832 if ((flags & kVisitRootFlagAllRoots) != 0) {
1833 // Argument for how root visiting deals with ArtField and ArtMethod roots.
1834 // There is 3 GC cases to handle:
1835 // Non moving concurrent:
1836 // This case is easy to handle since the reference members of ArtMethod and ArtFields are held
1837 // live by the class and class roots.
1839 // Moving non-concurrent:
1840 // This case needs to call visit VisitNativeRoots in case the classes or dex cache arrays move.
1841 // To prevent missing roots, this case needs to ensure that there is no
1842 // suspend points between the point which we allocate ArtMethod arrays and place them in a
1843 // class which is in the class table.
1845 // Moving concurrent:
1846 // Need to make sure to not copy ArtMethods without doing read barriers since the roots are
1847 // marked concurrently and we don't hold the classlinker_classes_lock_ when we do the copy.
1848 boot_class_table_.VisitRoots(buffered_visitor);
1850 // If tracing is enabled, then mark all the class loaders to prevent unloading.
1851 if (tracing_enabled) {
1852 for (const ClassLoaderData& data : class_loaders_) {
1853 GcRoot<mirror::Object> root(GcRoot<mirror::Object>(self->DecodeJObject(data.weak_root)));
1854 root.VisitRoot(visitor, RootInfo(kRootVMInternal));
1857 } else if ((flags & kVisitRootFlagNewRoots) != 0) {
1858 for (auto& root : new_class_roots_) {
1859 mirror::Class* old_ref = root.Read<kWithoutReadBarrier>();
1860 root.VisitRoot(visitor, RootInfo(kRootStickyClass));
1861 mirror::Class* new_ref = root.Read<kWithoutReadBarrier>();
1862 // Concurrent moving GC marked new roots through the to-space invariant.
1863 CHECK_EQ(new_ref, old_ref);
1866 buffered_visitor.Flush(); // Flush before clearing new_class_roots_.
1867 if ((flags & kVisitRootFlagClearRootLog) != 0) {
1868 new_class_roots_.clear();
1870 if ((flags & kVisitRootFlagStartLoggingNewRoots) != 0) {
1871 log_new_class_table_roots_ = true;
1872 } else if ((flags & kVisitRootFlagStopLoggingNewRoots) != 0) {
1873 log_new_class_table_roots_ = false;
1875 // We deliberately ignore the class roots in the image since we
1876 // handle image roots by using the MS/CMS rescanning of dirty cards.
1879 // Keep in sync with InitCallback. Anything we visit, we need to
1880 // reinit references to when reinitializing a ClassLinker from a
1882 void ClassLinker::VisitRoots(RootVisitor* visitor, VisitRootFlags flags) {
1883 class_roots_.VisitRootIfNonNull(visitor, RootInfo(kRootVMInternal));
1884 VisitClassRoots(visitor, flags);
1885 array_iftable_.VisitRootIfNonNull(visitor, RootInfo(kRootVMInternal));
1886 // Instead of visiting the find_array_class_cache_ drop it so that it doesn't prevent class
1887 // unloading if we are marking roots.
1888 DropFindArrayClassCache();
1891 class VisitClassLoaderClassesVisitor : public ClassLoaderVisitor {
1893 explicit VisitClassLoaderClassesVisitor(ClassVisitor* visitor)
1894 : visitor_(visitor),
1897 void Visit(mirror::ClassLoader* class_loader)
1898 SHARED_REQUIRES(Locks::classlinker_classes_lock_, Locks::mutator_lock_) OVERRIDE {
1899 ClassTable* const class_table = class_loader->GetClassTable();
1900 if (!done_ && class_table != nullptr && !class_table->Visit(*visitor_)) {
1901 // If the visitor ClassTable returns false it means that we don't need to continue.
1907 ClassVisitor* const visitor_;
1908 // If done is true then we don't need to do any more visiting.
1912 void ClassLinker::VisitClassesInternal(ClassVisitor* visitor) {
1913 if (boot_class_table_.Visit(*visitor)) {
1914 VisitClassLoaderClassesVisitor loader_visitor(visitor);
1915 VisitClassLoaders(&loader_visitor);
1919 void ClassLinker::VisitClasses(ClassVisitor* visitor) {
1920 if (dex_cache_boot_image_class_lookup_required_) {
1921 AddBootImageClassesToClassTable();
1923 Thread* const self = Thread::Current();
1924 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_);
1925 // Not safe to have thread suspension when we are holding a lock.
1926 if (self != nullptr) {
1927 ScopedAssertNoThreadSuspension nts(self, __FUNCTION__);
1928 VisitClassesInternal(visitor);
1930 VisitClassesInternal(visitor);
1934 class GetClassesInToVector : public ClassVisitor {
1936 bool operator()(mirror::Class* klass) OVERRIDE {
1937 classes_.push_back(klass);
1940 std::vector<mirror::Class*> classes_;
1943 class GetClassInToObjectArray : public ClassVisitor {
1945 explicit GetClassInToObjectArray(mirror::ObjectArray<mirror::Class>* arr)
1946 : arr_(arr), index_(0) {}
1948 bool operator()(mirror::Class* klass) OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) {
1950 if (index_ <= arr_->GetLength()) {
1951 arr_->Set(index_ - 1, klass);
1957 bool Succeeded() const SHARED_REQUIRES(Locks::mutator_lock_) {
1958 return index_ <= arr_->GetLength();
1962 mirror::ObjectArray<mirror::Class>* const arr_;
1966 void ClassLinker::VisitClassesWithoutClassesLock(ClassVisitor* visitor) {
1967 // TODO: it may be possible to avoid secondary storage if we iterate over dex caches. The problem
1968 // is avoiding duplicates.
1969 Thread* const self = Thread::Current();
1970 if (!kMovingClasses) {
1971 ScopedAssertNoThreadSuspension nts(self, __FUNCTION__);
1972 GetClassesInToVector accumulator;
1973 VisitClasses(&accumulator);
1974 for (mirror::Class* klass : accumulator.classes_) {
1975 if (!visitor->operator()(klass)) {
1980 StackHandleScope<1> hs(self);
1981 auto classes = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr);
1982 // We size the array assuming classes won't be added to the class table during the visit.
1983 // If this assumption fails we iterate again.
1985 size_t class_table_size;
1987 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_);
1988 // Add 100 in case new classes get loaded when we are filling in the object array.
1989 class_table_size = NumZygoteClasses() + NumNonZygoteClasses() + 100;
1991 mirror::Class* class_type = mirror::Class::GetJavaLangClass();
1992 mirror::Class* array_of_class = FindArrayClass(self, &class_type);
1994 mirror::ObjectArray<mirror::Class>::Alloc(self, array_of_class, class_table_size));
1995 CHECK(classes.Get() != nullptr); // OOME.
1996 GetClassInToObjectArray accumulator(classes.Get());
1997 VisitClasses(&accumulator);
1998 if (accumulator.Succeeded()) {
2002 for (int32_t i = 0; i < classes->GetLength(); ++i) {
2003 // If the class table shrank during creation of the clases array we expect null elements. If
2004 // the class table grew then the loop repeats. If classes are created after the loop has
2005 // finished then we don't visit.
2006 mirror::Class* klass = classes->Get(i);
2007 if (klass != nullptr && !visitor->operator()(klass)) {
2014 ClassLinker::~ClassLinker() {
2015 mirror::Class::ResetClass();
2016 mirror::Constructor::ResetClass();
2017 mirror::Field::ResetClass();
2018 mirror::Method::ResetClass();
2019 mirror::Reference::ResetClass();
2020 mirror::StackTraceElement::ResetClass();
2021 mirror::String::ResetClass();
2022 mirror::Throwable::ResetClass();
2023 mirror::BooleanArray::ResetArrayClass();
2024 mirror::ByteArray::ResetArrayClass();
2025 mirror::CharArray::ResetArrayClass();
2026 mirror::Constructor::ResetArrayClass();
2027 mirror::DoubleArray::ResetArrayClass();
2028 mirror::Field::ResetArrayClass();
2029 mirror::FloatArray::ResetArrayClass();
2030 mirror::Method::ResetArrayClass();
2031 mirror::IntArray::ResetArrayClass();
2032 mirror::LongArray::ResetArrayClass();
2033 mirror::ShortArray::ResetArrayClass();
2034 Thread* const self = Thread::Current();
2035 for (const ClassLoaderData& data : class_loaders_) {
2036 DeleteClassLoader(self, data);
2038 class_loaders_.clear();
2041 void ClassLinker::DeleteClassLoader(Thread* self, const ClassLoaderData& data) {
2042 Runtime* const runtime = Runtime::Current();
2043 JavaVMExt* const vm = runtime->GetJavaVM();
2044 vm->DeleteWeakGlobalRef(self, data.weak_root);
2045 // Notify the JIT that we need to remove the methods and/or profiling info.
2046 if (runtime->GetJit() != nullptr) {
2047 jit::JitCodeCache* code_cache = runtime->GetJit()->GetCodeCache();
2048 if (code_cache != nullptr) {
2049 code_cache->RemoveMethodsIn(self, *data.allocator);
2052 delete data.allocator;
2053 delete data.class_table;
2056 mirror::PointerArray* ClassLinker::AllocPointerArray(Thread* self, size_t length) {
2057 return down_cast<mirror::PointerArray*>(image_pointer_size_ == 8u ?
2058 static_cast<mirror::Array*>(mirror::LongArray::Alloc(self, length)) :
2059 static_cast<mirror::Array*>(mirror::IntArray::Alloc(self, length)));
2062 mirror::DexCache* ClassLinker::AllocDexCache(Thread* self,
2063 const DexFile& dex_file,
2064 LinearAlloc* linear_alloc) {
2065 StackHandleScope<6> hs(self);
2066 auto dex_cache(hs.NewHandle(down_cast<mirror::DexCache*>(
2067 GetClassRoot(kJavaLangDexCache)->AllocObject(self))));
2068 if (dex_cache.Get() == nullptr) {
2069 self->AssertPendingOOMException();
2072 auto location(hs.NewHandle(intern_table_->InternStrong(dex_file.GetLocation().c_str())));
2073 if (location.Get() == nullptr) {
2074 self->AssertPendingOOMException();
2077 DexCacheArraysLayout layout(image_pointer_size_, &dex_file);
2078 uint8_t* raw_arrays = nullptr;
2079 if (dex_file.GetOatDexFile() != nullptr &&
2080 dex_file.GetOatDexFile()->GetDexCacheArrays() != nullptr) {
2081 raw_arrays = dex_file.GetOatDexFile()->GetDexCacheArrays();
2082 } else if (dex_file.NumStringIds() != 0u || dex_file.NumTypeIds() != 0u ||
2083 dex_file.NumMethodIds() != 0u || dex_file.NumFieldIds() != 0u) {
2084 // NOTE: We "leak" the raw_arrays because we never destroy the dex cache.
2085 DCHECK(image_pointer_size_ == 4u || image_pointer_size_ == 8u);
2086 // Zero-initialized.
2087 raw_arrays = reinterpret_cast<uint8_t*>(linear_alloc->Alloc(self, layout.Size()));
2089 GcRoot<mirror::String>* strings = (dex_file.NumStringIds() == 0u) ? nullptr :
2090 reinterpret_cast<GcRoot<mirror::String>*>(raw_arrays + layout.StringsOffset());
2091 GcRoot<mirror::Class>* types = (dex_file.NumTypeIds() == 0u) ? nullptr :
2092 reinterpret_cast<GcRoot<mirror::Class>*>(raw_arrays + layout.TypesOffset());
2093 ArtMethod** methods = (dex_file.NumMethodIds() == 0u) ? nullptr :
2094 reinterpret_cast<ArtMethod**>(raw_arrays + layout.MethodsOffset());
2095 ArtField** fields = (dex_file.NumFieldIds() == 0u) ? nullptr :
2096 reinterpret_cast<ArtField**>(raw_arrays + layout.FieldsOffset());
2097 if (kIsDebugBuild) {
2098 // Sanity check to make sure all the dex cache arrays are empty. b/28992179
2099 for (size_t i = 0; i < dex_file.NumStringIds(); ++i) {
2100 CHECK(strings[i].Read<kWithoutReadBarrier>() == nullptr);
2102 for (size_t i = 0; i < dex_file.NumTypeIds(); ++i) {
2103 CHECK(types[i].Read<kWithoutReadBarrier>() == nullptr);
2105 for (size_t i = 0; i < dex_file.NumMethodIds(); ++i) {
2106 CHECK(mirror::DexCache::GetElementPtrSize(methods, i, image_pointer_size_) == nullptr);
2108 for (size_t i = 0; i < dex_file.NumFieldIds(); ++i) {
2109 CHECK(mirror::DexCache::GetElementPtrSize(fields, i, image_pointer_size_) == nullptr);
2112 dex_cache->Init(&dex_file,
2115 dex_file.NumStringIds(),
2117 dex_file.NumTypeIds(),
2119 dex_file.NumMethodIds(),
2121 dex_file.NumFieldIds(),
2122 image_pointer_size_);
2123 return dex_cache.Get();
2126 mirror::Class* ClassLinker::AllocClass(Thread* self, mirror::Class* java_lang_Class,
2127 uint32_t class_size) {
2128 DCHECK_GE(class_size, sizeof(mirror::Class));
2129 gc::Heap* heap = Runtime::Current()->GetHeap();
2130 mirror::Class::InitializeClassVisitor visitor(class_size);
2131 mirror::Object* k = kMovingClasses ?
2132 heap->AllocObject<true>(self, java_lang_Class, class_size, visitor) :
2133 heap->AllocNonMovableObject<true>(self, java_lang_Class, class_size, visitor);
2134 if (UNLIKELY(k == nullptr)) {
2135 self->AssertPendingOOMException();
2138 return k->AsClass();
2141 mirror::Class* ClassLinker::AllocClass(Thread* self, uint32_t class_size) {
2142 return AllocClass(self, GetClassRoot(kJavaLangClass), class_size);
2145 mirror::ObjectArray<mirror::StackTraceElement>* ClassLinker::AllocStackTraceElementArray(
2148 return mirror::ObjectArray<mirror::StackTraceElement>::Alloc(
2149 self, GetClassRoot(kJavaLangStackTraceElementArrayClass), length);
2152 mirror::Class* ClassLinker::EnsureResolved(Thread* self,
2153 const char* descriptor,
2154 mirror::Class* klass) {
2155 DCHECK(klass != nullptr);
2157 // For temporary classes we must wait for them to be retired.
2158 if (init_done_ && klass->IsTemp()) {
2159 CHECK(!klass->IsResolved());
2160 if (klass->IsErroneous()) {
2161 ThrowEarlierClassFailure(klass);
2164 StackHandleScope<1> hs(self);
2165 Handle<mirror::Class> h_class(hs.NewHandle(klass));
2166 ObjectLock<mirror::Class> lock(self, h_class);
2167 // Loop and wait for the resolving thread to retire this class.
2168 while (!h_class->IsRetired() && !h_class->IsErroneous()) {
2169 lock.WaitIgnoringInterrupts();
2171 if (h_class->IsErroneous()) {
2172 ThrowEarlierClassFailure(h_class.Get());
2175 CHECK(h_class->IsRetired());
2176 // Get the updated class from class table.
2177 klass = LookupClass(self, descriptor, ComputeModifiedUtf8Hash(descriptor),
2178 h_class.Get()->GetClassLoader());
2181 // Wait for the class if it has not already been linked.
2183 // Maximum number of yield iterations until we start sleeping.
2184 static const size_t kNumYieldIterations = 1000;
2185 // How long each sleep is in us.
2186 static const size_t kSleepDurationUS = 1000; // 1 ms.
2187 while (!klass->IsResolved() && !klass->IsErroneous()) {
2188 StackHandleScope<1> hs(self);
2189 HandleWrapper<mirror::Class> h_class(hs.NewHandleWrapper(&klass));
2191 ObjectTryLock<mirror::Class> lock(self, h_class);
2192 // Can not use a monitor wait here since it may block when returning and deadlock if another
2193 // thread has locked klass.
2194 if (lock.Acquired()) {
2195 // Check for circular dependencies between classes, the lock is required for SetStatus.
2196 if (!h_class->IsResolved() && h_class->GetClinitThreadId() == self->GetTid()) {
2197 ThrowClassCircularityError(h_class.Get());
2198 mirror::Class::SetStatus(h_class, mirror::Class::kStatusError, self);
2204 // Handle wrapper deals with klass moving.
2205 ScopedThreadSuspension sts(self, kSuspended);
2206 if (index < kNumYieldIterations) {
2209 usleep(kSleepDurationUS);
2215 if (klass->IsErroneous()) {
2216 ThrowEarlierClassFailure(klass);
2219 // Return the loaded class. No exceptions should be pending.
2220 CHECK(klass->IsResolved()) << PrettyClass(klass);
2221 self->AssertNoPendingException();
2225 typedef std::pair<const DexFile*, const DexFile::ClassDef*> ClassPathEntry;
2227 // Search a collection of DexFiles for a descriptor
2228 ClassPathEntry FindInClassPath(const char* descriptor,
2229 size_t hash, const std::vector<const DexFile*>& class_path) {
2230 for (const DexFile* dex_file : class_path) {
2231 const DexFile::ClassDef* dex_class_def = dex_file->FindClassDef(descriptor, hash);
2232 if (dex_class_def != nullptr) {
2233 return ClassPathEntry(dex_file, dex_class_def);
2236 return ClassPathEntry(nullptr, nullptr);
2239 bool ClassLinker::FindClassInPathClassLoader(ScopedObjectAccessAlreadyRunnable& soa,
2241 const char* descriptor,
2243 Handle<mirror::ClassLoader> class_loader,
2244 mirror::Class** result) {
2245 // Termination case: boot class-loader.
2246 if (IsBootClassLoader(soa, class_loader.Get())) {
2247 // The boot class loader, search the boot class path.
2248 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_);
2249 if (pair.second != nullptr) {
2250 mirror::Class* klass = LookupClass(self, descriptor, hash, nullptr);
2251 if (klass != nullptr) {
2252 *result = EnsureResolved(self, descriptor, klass);
2254 *result = DefineClass(self,
2257 ScopedNullHandle<mirror::ClassLoader>(),
2261 if (*result == nullptr) {
2262 CHECK(self->IsExceptionPending()) << descriptor;
2263 self->ClearException();
2271 // Unsupported class-loader?
2272 if (class_loader->GetClass() !=
2273 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader)) {
2278 // Handles as RegisterDexFile may allocate dex caches (and cause thread suspension).
2279 StackHandleScope<4> hs(self);
2280 Handle<mirror::ClassLoader> h_parent(hs.NewHandle(class_loader->GetParent()));
2281 bool recursive_result = FindClassInPathClassLoader(soa, self, descriptor, hash, h_parent, result);
2283 if (!recursive_result) {
2284 // Something wrong up the chain.
2288 if (*result != nullptr) {
2289 // Found the class up the chain.
2293 // Handle this step.
2294 // Handle as if this is the child PathClassLoader.
2295 // The class loader is a PathClassLoader which inherits from BaseDexClassLoader.
2296 // We need to get the DexPathList and loop through it.
2297 ArtField* const cookie_field = soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie);
2298 ArtField* const dex_file_field =
2299 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile);
2300 mirror::Object* dex_path_list =
2301 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList)->
2302 GetObject(class_loader.Get());
2303 if (dex_path_list != nullptr && dex_file_field != nullptr && cookie_field != nullptr) {
2304 // DexPathList has an array dexElements of Elements[] which each contain a dex file.
2305 mirror::Object* dex_elements_obj =
2306 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements)->
2307 GetObject(dex_path_list);
2308 // Loop through each dalvik.system.DexPathList$Element's dalvik.system.DexFile and look
2309 // at the mCookie which is a DexFile vector.
2310 if (dex_elements_obj != nullptr) {
2311 Handle<mirror::ObjectArray<mirror::Object>> dex_elements =
2312 hs.NewHandle(dex_elements_obj->AsObjectArray<mirror::Object>());
2313 for (int32_t i = 0; i < dex_elements->GetLength(); ++i) {
2314 mirror::Object* element = dex_elements->GetWithoutChecks(i);
2315 if (element == nullptr) {
2316 // Should never happen, fall back to java code to throw a NPE.
2319 mirror::Object* dex_file = dex_file_field->GetObject(element);
2320 if (dex_file != nullptr) {
2321 mirror::LongArray* long_array = cookie_field->GetObject(dex_file)->AsLongArray();
2322 if (long_array == nullptr) {
2323 // This should never happen so log a warning.
2324 LOG(WARNING) << "Null DexFile::mCookie for " << descriptor;
2327 int32_t long_array_size = long_array->GetLength();
2328 // First element is the oat file.
2329 for (int32_t j = kDexFileIndexStart; j < long_array_size; ++j) {
2330 const DexFile* cp_dex_file = reinterpret_cast<const DexFile*>(static_cast<uintptr_t>(
2331 long_array->GetWithoutChecks(j)));
2332 const DexFile::ClassDef* dex_class_def = cp_dex_file->FindClassDef(descriptor, hash);
2333 if (dex_class_def != nullptr) {
2334 mirror::Class* klass = DefineClass(self,
2340 if (klass == nullptr) {
2341 CHECK(self->IsExceptionPending()) << descriptor;
2342 self->ClearException();
2343 // TODO: Is it really right to break here, and not check the other dex files?
2353 self->AssertNoPendingException();
2356 // Result is still null from the parent call, no need to set it again...
2360 mirror::Class* ClassLinker::FindClass(Thread* self,
2361 const char* descriptor,
2362 Handle<mirror::ClassLoader> class_loader) {
2363 DCHECK_NE(*descriptor, '\0') << "descriptor is empty string";
2364 DCHECK(self != nullptr);
2365 self->AssertNoPendingException();
2366 if (descriptor[1] == '\0') {
2367 // only the descriptors of primitive types should be 1 character long, also avoid class lookup
2368 // for primitive classes that aren't backed by dex files.
2369 return FindPrimitiveClass(descriptor[0]);
2371 const size_t hash = ComputeModifiedUtf8Hash(descriptor);
2372 // Find the class in the loaded classes table.
2373 mirror::Class* klass = LookupClass(self, descriptor, hash, class_loader.Get());
2374 if (klass != nullptr) {
2375 return EnsureResolved(self, descriptor, klass);
2377 // Class is not yet loaded.
2378 if (descriptor[0] == '[') {
2379 return CreateArrayClass(self, descriptor, hash, class_loader);
2380 } else if (class_loader.Get() == nullptr) {
2381 // The boot class loader, search the boot class path.
2382 ClassPathEntry pair = FindInClassPath(descriptor, hash, boot_class_path_);
2383 if (pair.second != nullptr) {
2384 return DefineClass(self,
2387 ScopedNullHandle<mirror::ClassLoader>(),
2391 // The boot class loader is searched ahead of the application class loader, failures are
2392 // expected and will be wrapped in a ClassNotFoundException. Use the pre-allocated error to
2393 // trigger the chaining with a proper stack trace.
2394 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError();
2395 self->SetException(pre_allocated);
2399 ScopedObjectAccessUnchecked soa(self);
2400 mirror::Class* cp_klass;
2401 if (FindClassInPathClassLoader(soa, self, descriptor, hash, class_loader, &cp_klass)) {
2402 // The chain was understood. So the value in cp_klass is either the class we were looking
2403 // for, or not found.
2404 if (cp_klass != nullptr) {
2407 // TODO: We handle the boot classpath loader in FindClassInPathClassLoader. Try to unify this
2408 // and the branch above. TODO: throw the right exception here.
2410 // We'll let the Java-side rediscover all this and throw the exception with the right stack
2414 if (Runtime::Current()->IsAotCompiler()) {
2415 // Oops, compile-time, can't run actual class-loader code.
2416 mirror::Throwable* pre_allocated = Runtime::Current()->GetPreAllocatedNoClassDefFoundError();
2417 self->SetException(pre_allocated);
2421 ScopedLocalRef<jobject> class_loader_object(soa.Env(),
2422 soa.AddLocalReference<jobject>(class_loader.Get()));
2423 std::string class_name_string(DescriptorToDot(descriptor));
2424 ScopedLocalRef<jobject> result(soa.Env(), nullptr);
2426 ScopedThreadStateChange tsc(self, kNative);
2427 ScopedLocalRef<jobject> class_name_object(soa.Env(),
2428 soa.Env()->NewStringUTF(class_name_string.c_str()));
2429 if (class_name_object.get() == nullptr) {
2430 DCHECK(self->IsExceptionPending()); // OOME.
2433 CHECK(class_loader_object.get() != nullptr);
2434 result.reset(soa.Env()->CallObjectMethod(class_loader_object.get(),
2435 WellKnownClasses::java_lang_ClassLoader_loadClass,
2436 class_name_object.get()));
2438 if (self->IsExceptionPending()) {
2439 // If the ClassLoader threw, pass that exception up.
2441 } else if (result.get() == nullptr) {
2442 // broken loader - throw NPE to be compatible with Dalvik
2443 ThrowNullPointerException(StringPrintf("ClassLoader.loadClass returned null for %s",
2444 class_name_string.c_str()).c_str());
2447 // success, return mirror::Class*
2448 return soa.Decode<mirror::Class*>(result.get());
2454 mirror::Class* ClassLinker::DefineClass(Thread* self,
2455 const char* descriptor,
2457 Handle<mirror::ClassLoader> class_loader,
2458 const DexFile& dex_file,
2459 const DexFile::ClassDef& dex_class_def) {
2460 StackHandleScope<3> hs(self);
2461 auto klass = hs.NewHandle<mirror::Class>(nullptr);
2463 // Load the class from the dex file.
2464 if (UNLIKELY(!init_done_)) {
2465 // finish up init of hand crafted class_roots_
2466 if (strcmp(descriptor, "Ljava/lang/Object;") == 0) {
2467 klass.Assign(GetClassRoot(kJavaLangObject));
2468 } else if (strcmp(descriptor, "Ljava/lang/Class;") == 0) {
2469 klass.Assign(GetClassRoot(kJavaLangClass));
2470 } else if (strcmp(descriptor, "Ljava/lang/String;") == 0) {
2471 klass.Assign(GetClassRoot(kJavaLangString));
2472 } else if (strcmp(descriptor, "Ljava/lang/ref/Reference;") == 0) {
2473 klass.Assign(GetClassRoot(kJavaLangRefReference));
2474 } else if (strcmp(descriptor, "Ljava/lang/DexCache;") == 0) {
2475 klass.Assign(GetClassRoot(kJavaLangDexCache));
2479 if (klass.Get() == nullptr) {
2480 // Allocate a class with the status of not ready.
2481 // Interface object should get the right size here. Regular class will
2482 // figure out the right size later and be replaced with one of the right
2483 // size when the class becomes resolved.
2484 klass.Assign(AllocClass(self, SizeOfClassWithoutEmbeddedTables(dex_file, dex_class_def)));
2486 if (UNLIKELY(klass.Get() == nullptr)) {
2487 self->AssertPendingOOMException();
2490 mirror::DexCache* dex_cache = RegisterDexFile(dex_file, class_loader.Get());
2491 if (dex_cache == nullptr) {
2492 self->AssertPendingOOMException();
2495 klass->SetDexCache(dex_cache);
2496 SetupClass(dex_file, dex_class_def, klass, class_loader.Get());
2498 // Mark the string class by setting its access flag.
2499 if (UNLIKELY(!init_done_)) {
2500 if (strcmp(descriptor, "Ljava/lang/String;") == 0) {
2501 klass->SetStringClass();
2505 ObjectLock<mirror::Class> lock(self, klass);
2506 klass->SetClinitThreadId(self->GetTid());
2508 // Add the newly loaded class to the loaded classes table.
2509 mirror::Class* existing = InsertClass(descriptor, klass.Get(), hash);
2510 if (existing != nullptr) {
2511 // We failed to insert because we raced with another thread. Calling EnsureResolved may cause
2512 // this thread to block.
2513 return EnsureResolved(self, descriptor, existing);
2516 // Load the fields and other things after we are inserted in the table. This is so that we don't
2517 // end up allocating unfree-able linear alloc resources and then lose the race condition. The
2518 // other reason is that the field roots are only visited from the class table. So we need to be
2519 // inserted before we allocate / fill in these fields.
2520 LoadClass(self, dex_file, dex_class_def, klass);
2521 if (self->IsExceptionPending()) {
2522 VLOG(class_linker) << self->GetException()->Dump();
2523 // An exception occured during load, set status to erroneous while holding klass' lock in case
2524 // notification is necessary.
2525 if (!klass->IsErroneous()) {
2526 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
2531 // Finish loading (if necessary) by finding parents
2532 CHECK(!klass->IsLoaded());
2533 if (!LoadSuperAndInterfaces(klass, dex_file)) {
2535 if (!klass->IsErroneous()) {
2536 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
2540 CHECK(klass->IsLoaded());
2541 // Link the class (if necessary)
2542 CHECK(!klass->IsResolved());
2543 // TODO: Use fast jobjects?
2544 auto interfaces = hs.NewHandle<mirror::ObjectArray<mirror::Class>>(nullptr);
2546 MutableHandle<mirror::Class> h_new_class = hs.NewHandle<mirror::Class>(nullptr);
2547 if (!LinkClass(self, descriptor, klass, interfaces, &h_new_class)) {
2549 if (!klass->IsErroneous()) {
2550 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
2554 self->AssertNoPendingException();
2555 CHECK(h_new_class.Get() != nullptr) << descriptor;
2556 CHECK(h_new_class->IsResolved()) << descriptor;
2558 // Instrumentation may have updated entrypoints for all methods of all
2559 // classes. However it could not update methods of this class while we
2560 // were loading it. Now the class is resolved, we can update entrypoints
2561 // as required by instrumentation.
2562 if (Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()) {
2563 // We must be in the kRunnable state to prevent instrumentation from
2564 // suspending all threads to update entrypoints while we are doing it
2566 DCHECK_EQ(self->GetState(), kRunnable);
2567 Runtime::Current()->GetInstrumentation()->InstallStubsForClass(h_new_class.Get());
2571 * We send CLASS_PREPARE events to the debugger from here. The
2572 * definition of "preparation" is creating the static fields for a
2573 * class and initializing them to the standard default values, but not
2574 * executing any code (that comes later, during "initialization").
2576 * We did the static preparation in LinkClass.
2578 * The class has been prepared and resolved but possibly not yet verified
2581 Dbg::PostClassPrepare(h_new_class.Get());
2583 // Notify native debugger of the new class and its layout.
2584 jit::Jit::NewTypeLoadedIfUsingJit(h_new_class.Get());
2586 return h_new_class.Get();
2589 uint32_t ClassLinker::SizeOfClassWithoutEmbeddedTables(const DexFile& dex_file,
2590 const DexFile::ClassDef& dex_class_def) {
2591 const uint8_t* class_data = dex_file.GetClassData(dex_class_def);
2597 if (class_data != nullptr) {
2598 // We allow duplicate definitions of the same field in a class_data_item
2599 // but ignore the repeated indexes here, b/21868015.
2600 uint32_t last_field_idx = DexFile::kDexNoIndex;
2601 for (ClassDataItemIterator it(dex_file, class_data); it.HasNextStaticField(); it.Next()) {
2602 uint32_t field_idx = it.GetMemberIndex();
2603 // Ordering enforced by DexFileVerifier.
2604 DCHECK(last_field_idx == DexFile::kDexNoIndex || last_field_idx <= field_idx);
2605 if (UNLIKELY(field_idx == last_field_idx)) {
2608 last_field_idx = field_idx;
2609 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx);
2610 const char* descriptor = dex_file.GetFieldTypeDescriptor(field_id);
2611 char c = descriptor[0];
2634 LOG(FATAL) << "Unknown descriptor: " << c;
2639 return mirror::Class::ComputeClassSize(false,
2646 image_pointer_size_);
2649 OatFile::OatClass ClassLinker::FindOatClass(const DexFile& dex_file,
2650 uint16_t class_def_idx,
2652 DCHECK_NE(class_def_idx, DexFile::kDexNoIndex16);
2653 const OatFile::OatDexFile* oat_dex_file = dex_file.GetOatDexFile();
2654 if (oat_dex_file == nullptr) {
2656 return OatFile::OatClass::Invalid();
2659 return oat_dex_file->GetOatClass(class_def_idx);
2662 static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file,
2663 uint16_t class_def_idx,
2664 uint32_t method_idx) {
2665 const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_idx);
2666 const uint8_t* class_data = dex_file.GetClassData(class_def);
2667 CHECK(class_data != nullptr);
2668 ClassDataItemIterator it(dex_file, class_data);
2670 while (it.HasNextStaticField()) {
2673 while (it.HasNextInstanceField()) {
2677 size_t class_def_method_index = 0;
2678 while (it.HasNextDirectMethod()) {
2679 if (it.GetMemberIndex() == method_idx) {
2680 return class_def_method_index;
2682 class_def_method_index++;
2685 while (it.HasNextVirtualMethod()) {
2686 if (it.GetMemberIndex() == method_idx) {
2687 return class_def_method_index;
2689 class_def_method_index++;
2692 DCHECK(!it.HasNext());
2693 LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation();
2697 const OatFile::OatMethod ClassLinker::FindOatMethodFor(ArtMethod* method, bool* found) {
2698 // Although we overwrite the trampoline of non-static methods, we may get here via the resolution
2699 // method for direct methods (or virtual methods made direct).
2700 mirror::Class* declaring_class = method->GetDeclaringClass();
2701 size_t oat_method_index;
2702 if (method->IsStatic() || method->IsDirect()) {
2703 // Simple case where the oat method index was stashed at load time.
2704 oat_method_index = method->GetMethodIndex();
2706 // We're invoking a virtual method directly (thanks to sharpening), compute the oat_method_index
2707 // by search for its position in the declared virtual methods.
2708 oat_method_index = declaring_class->NumDirectMethods();
2709 bool found_virtual = false;
2710 for (ArtMethod& art_method : declaring_class->GetVirtualMethods(image_pointer_size_)) {
2711 // Check method index instead of identity in case of duplicate method definitions.
2712 if (method->GetDexMethodIndex() == art_method.GetDexMethodIndex()) {
2713 found_virtual = true;
2718 CHECK(found_virtual) << "Didn't find oat method index for virtual method: "
2719 << PrettyMethod(method);
2721 DCHECK_EQ(oat_method_index,
2722 GetOatMethodIndexFromMethodIndex(*declaring_class->GetDexCache()->GetDexFile(),
2723 method->GetDeclaringClass()->GetDexClassDefIndex(),
2724 method->GetDexMethodIndex()));
2725 OatFile::OatClass oat_class = FindOatClass(*declaring_class->GetDexCache()->GetDexFile(),
2726 declaring_class->GetDexClassDefIndex(),
2729 return OatFile::OatMethod::Invalid();
2731 return oat_class.GetOatMethod(oat_method_index);
2734 // Special case to get oat code without overwriting a trampoline.
2735 const void* ClassLinker::GetQuickOatCodeFor(ArtMethod* method) {
2736 CHECK(method->IsInvokable()) << PrettyMethod(method);
2737 if (method->IsProxyMethod()) {
2738 return GetQuickProxyInvokeHandler();
2741 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found);
2743 auto* code = oat_method.GetQuickCode();
2744 if (code != nullptr) {
2748 if (method->IsNative()) {
2749 // No code and native? Use generic trampoline.
2750 return GetQuickGenericJniStub();
2752 return GetQuickToInterpreterBridge();
2755 const void* ClassLinker::GetOatMethodQuickCodeFor(ArtMethod* method) {
2756 if (method->IsNative() || !method->IsInvokable() || method->IsProxyMethod()) {
2760 OatFile::OatMethod oat_method = FindOatMethodFor(method, &found);
2762 return oat_method.GetQuickCode();
2767 bool ClassLinker::ShouldUseInterpreterEntrypoint(ArtMethod* method, const void* quick_code) {
2768 if (UNLIKELY(method->IsNative() || method->IsProxyMethod())) {
2772 if (quick_code == nullptr) {
2776 Runtime* runtime = Runtime::Current();
2777 instrumentation::Instrumentation* instr = runtime->GetInstrumentation();
2778 if (instr->InterpretOnly()) {
2782 if (runtime->GetClassLinker()->IsQuickToInterpreterBridge(quick_code)) {
2783 // Doing this check avoids doing compiled/interpreter transitions.
2787 if (Dbg::IsForcedInterpreterNeededForCalling(Thread::Current(), method)) {
2788 // Force the use of interpreter when it is required by the debugger.
2792 if (runtime->IsNativeDebuggable()) {
2793 DCHECK(runtime->UseJitCompilation() && runtime->GetJit()->JitAtFirstUse());
2794 // If we are doing native debugging, ignore application's AOT code,
2795 // since we want to JIT it with extra stackmaps for native debugging.
2796 // On the other hand, keep all AOT code from the boot image, since the
2797 // blocking JIT would results in non-negligible performance impact.
2798 return !runtime->GetHeap()->IsInBootImageOatFile(quick_code);
2801 if (Dbg::IsDebuggerActive()) {
2802 // Boot image classes may be AOT-compiled as non-debuggable.
2803 // This is not suitable for the Java debugger, so ignore the AOT code.
2804 return runtime->GetHeap()->IsInBootImageOatFile(quick_code);
2810 void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) {
2811 DCHECK(klass->IsInitialized()) << PrettyDescriptor(klass);
2812 if (klass->NumDirectMethods() == 0) {
2813 return; // No direct methods => no static methods.
2815 Runtime* runtime = Runtime::Current();
2816 if (!runtime->IsStarted()) {
2817 if (runtime->IsAotCompiler() || runtime->GetHeap()->HasBootImageSpace()) {
2818 return; // OAT file unavailable.
2822 const DexFile& dex_file = klass->GetDexFile();
2823 const DexFile::ClassDef* dex_class_def = klass->GetClassDef();
2824 CHECK(dex_class_def != nullptr);
2825 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def);
2826 // There should always be class data if there were direct methods.
2827 CHECK(class_data != nullptr) << PrettyDescriptor(klass);
2828 ClassDataItemIterator it(dex_file, class_data);
2830 while (it.HasNextStaticField()) {
2833 while (it.HasNextInstanceField()) {
2837 OatFile::OatClass oat_class = FindOatClass(dex_file,
2838 klass->GetDexClassDefIndex(),
2840 // Link the code of methods skipped by LinkCode.
2841 for (size_t method_index = 0; it.HasNextDirectMethod(); ++method_index, it.Next()) {
2842 ArtMethod* method = klass->GetDirectMethod(method_index, image_pointer_size_);
2843 if (!method->IsStatic()) {
2844 // Only update static methods.
2847 const void* quick_code = nullptr;
2848 if (has_oat_class) {
2849 OatFile::OatMethod oat_method = oat_class.GetOatMethod(method_index);
2850 quick_code = oat_method.GetQuickCode();
2852 // Check whether the method is native, in which case it's generic JNI.
2853 if (quick_code == nullptr && method->IsNative()) {
2854 quick_code = GetQuickGenericJniStub();
2855 } else if (ShouldUseInterpreterEntrypoint(method, quick_code)) {
2856 // Use interpreter entry point.
2857 quick_code = GetQuickToInterpreterBridge();
2859 runtime->GetInstrumentation()->UpdateMethodsCode(method, quick_code);
2861 // Ignore virtual methods on the iterator.
2864 void ClassLinker::EnsureThrowsInvocationError(ArtMethod* method) {
2865 DCHECK(method != nullptr);
2866 DCHECK(!method->IsInvokable());
2867 method->SetEntryPointFromQuickCompiledCodePtrSize(quick_to_interpreter_bridge_trampoline_,
2868 image_pointer_size_);
2871 void ClassLinker::LinkCode(ArtMethod* method, const OatFile::OatClass* oat_class,
2872 uint32_t class_def_method_index) {
2873 Runtime* const runtime = Runtime::Current();
2874 if (runtime->IsAotCompiler()) {
2875 // The following code only applies to a non-compiler runtime.
2878 // Method shouldn't have already been linked.
2879 DCHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr);
2880 if (oat_class != nullptr) {
2881 // Every kind of method should at least get an invoke stub from the oat_method.
2882 // non-abstract methods also get their code pointers.
2883 const OatFile::OatMethod oat_method = oat_class->GetOatMethod(class_def_method_index);
2884 oat_method.LinkMethod(method);
2887 // Install entry point from interpreter.
2888 const void* quick_code = method->GetEntryPointFromQuickCompiledCode();
2889 bool enter_interpreter = ShouldUseInterpreterEntrypoint(method, quick_code);
2891 if (!method->IsInvokable()) {
2892 EnsureThrowsInvocationError(method);
2896 if (method->IsStatic() && !method->IsConstructor()) {
2897 // For static methods excluding the class initializer, install the trampoline.
2898 // It will be replaced by the proper entry point by ClassLinker::FixupStaticTrampolines
2899 // after initializing class (see ClassLinker::InitializeClass method).
2900 method->SetEntryPointFromQuickCompiledCode(GetQuickResolutionStub());
2901 } else if (quick_code == nullptr && method->IsNative()) {
2902 method->SetEntryPointFromQuickCompiledCode(GetQuickGenericJniStub());
2903 } else if (enter_interpreter) {
2904 // Set entry point from compiled code if there's no code or in interpreter only mode.
2905 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge());
2908 if (method->IsNative()) {
2909 // Unregistering restores the dlsym lookup stub.
2910 method->UnregisterNative();
2912 if (enter_interpreter || quick_code == nullptr) {
2913 // We have a native method here without code. Then it should have either the generic JNI
2914 // trampoline as entrypoint (non-static), or the resolution trampoline (static).
2915 // TODO: this doesn't handle all the cases where trampolines may be installed.
2916 const void* entry_point = method->GetEntryPointFromQuickCompiledCode();
2917 DCHECK(IsQuickGenericJniStub(entry_point) || IsQuickResolutionStub(entry_point));
2922 void ClassLinker::SetupClass(const DexFile& dex_file,
2923 const DexFile::ClassDef& dex_class_def,
2924 Handle<mirror::Class> klass,
2925 mirror::ClassLoader* class_loader) {
2926 CHECK(klass.Get() != nullptr);
2927 CHECK(klass->GetDexCache() != nullptr);
2928 CHECK_EQ(mirror::Class::kStatusNotReady, klass->GetStatus());
2929 const char* descriptor = dex_file.GetClassDescriptor(dex_class_def);
2930 CHECK(descriptor != nullptr);
2932 klass->SetClass(GetClassRoot(kJavaLangClass));
2933 uint32_t access_flags = dex_class_def.GetJavaAccessFlags();
2934 CHECK_EQ(access_flags & ~kAccJavaFlagsMask, 0U);
2935 klass->SetAccessFlags(access_flags);
2936 klass->SetClassLoader(class_loader);
2937 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot);
2938 mirror::Class::SetStatus(klass, mirror::Class::kStatusIdx, nullptr);
2940 klass->SetDexClassDefIndex(dex_file.GetIndexForClassDef(dex_class_def));
2941 klass->SetDexTypeIndex(dex_class_def.class_idx_);
2942 CHECK(klass->GetDexCacheStrings() != nullptr);
2945 void ClassLinker::LoadClass(Thread* self,
2946 const DexFile& dex_file,
2947 const DexFile::ClassDef& dex_class_def,
2948 Handle<mirror::Class> klass) {
2949 const uint8_t* class_data = dex_file.GetClassData(dex_class_def);
2950 if (class_data == nullptr) {
2951 return; // no fields or methods - for example a marker interface
2953 bool has_oat_class = false;
2954 if (Runtime::Current()->IsStarted() && !Runtime::Current()->IsAotCompiler()) {
2955 OatFile::OatClass oat_class = FindOatClass(dex_file, klass->GetDexClassDefIndex(),
2957 if (has_oat_class) {
2958 LoadClassMembers(self, dex_file, class_data, klass, &oat_class);
2961 if (!has_oat_class) {
2962 LoadClassMembers(self, dex_file, class_data, klass, nullptr);
2966 LengthPrefixedArray<ArtField>* ClassLinker::AllocArtFieldArray(Thread* self,
2967 LinearAlloc* allocator,
2972 // If the ArtField alignment changes, review all uses of LengthPrefixedArray<ArtField>.
2973 static_assert(alignof(ArtField) == 4, "ArtField alignment is expected to be 4.");
2974 size_t storage_size = LengthPrefixedArray<ArtField>::ComputeSize(length);
2975 void* array_storage = allocator->Alloc(self, storage_size);
2976 auto* ret = new(array_storage) LengthPrefixedArray<ArtField>(length);
2977 CHECK(ret != nullptr);
2978 std::uninitialized_fill_n(&ret->At(0), length, ArtField());
2982 LengthPrefixedArray<ArtMethod>* ClassLinker::AllocArtMethodArray(Thread* self,
2983 LinearAlloc* allocator,
2988 const size_t method_alignment = ArtMethod::Alignment(image_pointer_size_);
2989 const size_t method_size = ArtMethod::Size(image_pointer_size_);
2990 const size_t storage_size =
2991 LengthPrefixedArray<ArtMethod>::ComputeSize(length, method_size, method_alignment);
2992 void* array_storage = allocator->Alloc(self, storage_size);
2993 auto* ret = new (array_storage) LengthPrefixedArray<ArtMethod>(length);
2994 CHECK(ret != nullptr);
2995 for (size_t i = 0; i < length; ++i) {
2996 new(reinterpret_cast<void*>(&ret->At(i, method_size, method_alignment))) ArtMethod;
3001 LinearAlloc* ClassLinker::GetAllocatorForClassLoader(mirror::ClassLoader* class_loader) {
3002 if (class_loader == nullptr) {
3003 return Runtime::Current()->GetLinearAlloc();
3005 LinearAlloc* allocator = class_loader->GetAllocator();
3006 DCHECK(allocator != nullptr);
3010 LinearAlloc* ClassLinker::GetOrCreateAllocatorForClassLoader(mirror::ClassLoader* class_loader) {
3011 if (class_loader == nullptr) {
3012 return Runtime::Current()->GetLinearAlloc();
3014 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_);
3015 LinearAlloc* allocator = class_loader->GetAllocator();
3016 if (allocator == nullptr) {
3017 RegisterClassLoader(class_loader);
3018 allocator = class_loader->GetAllocator();
3019 CHECK(allocator != nullptr);
3024 void ClassLinker::LoadClassMembers(Thread* self,
3025 const DexFile& dex_file,
3026 const uint8_t* class_data,
3027 Handle<mirror::Class> klass,
3028 const OatFile::OatClass* oat_class) {
3030 // Note: We cannot have thread suspension until the field and method arrays are setup or else
3031 // Class::VisitFieldRoots may miss some fields or methods.
3032 ScopedAssertNoThreadSuspension nts(self, __FUNCTION__);
3033 // Load static fields.
3034 // We allow duplicate definitions of the same field in a class_data_item
3035 // but ignore the repeated indexes here, b/21868015.
3036 LinearAlloc* const allocator = GetAllocatorForClassLoader(klass->GetClassLoader());
3037 ClassDataItemIterator it(dex_file, class_data);
3038 LengthPrefixedArray<ArtField>* sfields = AllocArtFieldArray(self,
3040 it.NumStaticFields());
3041 size_t num_sfields = 0;
3042 uint32_t last_field_idx = 0u;
3043 for (; it.HasNextStaticField(); it.Next()) {
3044 uint32_t field_idx = it.GetMemberIndex();
3045 DCHECK_GE(field_idx, last_field_idx); // Ordering enforced by DexFileVerifier.
3046 if (num_sfields == 0 || LIKELY(field_idx > last_field_idx)) {
3047 DCHECK_LT(num_sfields, it.NumStaticFields());
3048 LoadField(it, klass, &sfields->At(num_sfields));
3050 last_field_idx = field_idx;
3053 // Load instance fields.
3054 LengthPrefixedArray<ArtField>* ifields = AllocArtFieldArray(self,
3056 it.NumInstanceFields());
3057 size_t num_ifields = 0u;
3058 last_field_idx = 0u;
3059 for (; it.HasNextInstanceField(); it.Next()) {
3060 uint32_t field_idx = it.GetMemberIndex();
3061 DCHECK_GE(field_idx, last_field_idx); // Ordering enforced by DexFileVerifier.
3062 if (num_ifields == 0 || LIKELY(field_idx > last_field_idx)) {
3063 DCHECK_LT(num_ifields, it.NumInstanceFields());
3064 LoadField(it, klass, &ifields->At(num_ifields));
3066 last_field_idx = field_idx;
3069 if (UNLIKELY(num_sfields != it.NumStaticFields()) ||
3070 UNLIKELY(num_ifields != it.NumInstanceFields())) {
3071 LOG(WARNING) << "Duplicate fields in class " << PrettyDescriptor(klass.Get())
3072 << " (unique static fields: " << num_sfields << "/" << it.NumStaticFields()
3073 << ", unique instance fields: " << num_ifields << "/" << it.NumInstanceFields() << ")";
3074 // NOTE: Not shrinking the over-allocated sfields/ifields, just setting size.
3075 if (sfields != nullptr) {
3076 sfields->SetSize(num_sfields);
3078 if (ifields != nullptr) {
3079 ifields->SetSize(num_ifields);
3082 // Set the field arrays.
3083 klass->SetSFieldsPtr(sfields);
3084 DCHECK_EQ(klass->NumStaticFields(), num_sfields);
3085 klass->SetIFieldsPtr(ifields);
3086 DCHECK_EQ(klass->NumInstanceFields(), num_ifields);
3088 klass->SetMethodsPtr(
3089 AllocArtMethodArray(self, allocator, it.NumDirectMethods() + it.NumVirtualMethods()),
3090 it.NumDirectMethods(),
3091 it.NumVirtualMethods());
3092 size_t class_def_method_index = 0;
3093 uint32_t last_dex_method_index = DexFile::kDexNoIndex;
3094 size_t last_class_def_method_index = 0;
3095 // TODO These should really use the iterators.
3096 for (size_t i = 0; it.HasNextDirectMethod(); i++, it.Next()) {
3097 ArtMethod* method = klass->GetDirectMethodUnchecked(i, image_pointer_size_);
3098 LoadMethod(self, dex_file, it, klass, method);
3099 LinkCode(method, oat_class, class_def_method_index);
3100 uint32_t it_method_index = it.GetMemberIndex();
3101 if (last_dex_method_index == it_method_index) {
3103 method->SetMethodIndex(last_class_def_method_index);
3105 method->SetMethodIndex(class_def_method_index);
3106 last_dex_method_index = it_method_index;
3107 last_class_def_method_index = class_def_method_index;
3109 class_def_method_index++;
3111 for (size_t i = 0; it.HasNextVirtualMethod(); i++, it.Next()) {
3112 ArtMethod* method = klass->GetVirtualMethodUnchecked(i, image_pointer_size_);
3113 LoadMethod(self, dex_file, it, klass, method);
3114 DCHECK_EQ(class_def_method_index, it.NumDirectMethods() + i);
3115 LinkCode(method, oat_class, class_def_method_index);
3116 class_def_method_index++;
3118 DCHECK(!it.HasNext());
3120 // Ensure that the card is marked so that remembered sets pick up native roots.
3121 Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(klass.Get());
3122 self->AllowThreadSuspension();
3125 void ClassLinker::LoadField(const ClassDataItemIterator& it,
3126 Handle<mirror::Class> klass,
3128 const uint32_t field_idx = it.GetMemberIndex();
3129 dst->SetDexFieldIndex(field_idx);
3130 dst->SetDeclaringClass(klass.Get());
3131 dst->SetAccessFlags(it.GetFieldAccessFlags());
3134 void ClassLinker::LoadMethod(Thread* self,
3135 const DexFile& dex_file,
3136 const ClassDataItemIterator& it,
3137 Handle<mirror::Class> klass,
3139 uint32_t dex_method_idx = it.GetMemberIndex();
3140 const DexFile::MethodId& method_id = dex_file.GetMethodId(dex_method_idx);
3141 const char* method_name = dex_file.StringDataByIdx(method_id.name_idx_);
3143 ScopedAssertNoThreadSuspension ants(self, "LoadMethod");
3144 dst->SetDexMethodIndex(dex_method_idx);
3145 dst->SetDeclaringClass(klass.Get());
3146 dst->SetCodeItemOffset(it.GetMethodCodeItemOffset());
3148 dst->SetDexCacheResolvedMethods(klass->GetDexCache()->GetResolvedMethods(), image_pointer_size_);
3149 dst->SetDexCacheResolvedTypes(klass->GetDexCache()->GetResolvedTypes(), image_pointer_size_);
3151 uint32_t access_flags = it.GetMethodAccessFlags();
3153 if (UNLIKELY(strcmp("finalize", method_name) == 0)) {
3154 // Set finalizable flag on declaring class.
3155 if (strcmp("V", dex_file.GetShorty(method_id.proto_idx_)) == 0) {
3156 // Void return type.
3157 if (klass->GetClassLoader() != nullptr) { // All non-boot finalizer methods are flagged.
3158 klass->SetFinalizable();
3161 const char* klass_descriptor = klass->GetDescriptor(&temp);
3162 // The Enum class declares a "final" finalize() method to prevent subclasses from
3163 // introducing a finalizer. We don't want to set the finalizable flag for Enum or its
3164 // subclasses, so we exclude it here.
3165 // We also want to avoid setting the flag on Object, where we know that finalize() is
3167 if (strcmp(klass_descriptor, "Ljava/lang/Object;") != 0 &&
3168 strcmp(klass_descriptor, "Ljava/lang/Enum;") != 0) {
3169 klass->SetFinalizable();
3173 } else if (method_name[0] == '<') {
3174 // Fix broken access flags for initializers. Bug 11157540.
3175 bool is_init = (strcmp("<init>", method_name) == 0);
3176 bool is_clinit = !is_init && (strcmp("<clinit>", method_name) == 0);
3177 if (UNLIKELY(!is_init && !is_clinit)) {
3178 LOG(WARNING) << "Unexpected '<' at start of method name " << method_name;
3180 if (UNLIKELY((access_flags & kAccConstructor) == 0)) {
3181 LOG(WARNING) << method_name << " didn't have expected constructor access flag in class "
3182 << PrettyDescriptor(klass.Get()) << " in dex file " << dex_file.GetLocation();
3183 access_flags |= kAccConstructor;
3187 dst->SetAccessFlags(access_flags);
3190 void ClassLinker::AppendToBootClassPath(Thread* self, const DexFile& dex_file) {
3191 StackHandleScope<1> hs(self);
3192 Handle<mirror::DexCache> dex_cache(hs.NewHandle(AllocDexCache(
3195 Runtime::Current()->GetLinearAlloc())));
3196 CHECK(dex_cache.Get() != nullptr) << "Failed to allocate dex cache for "
3197 << dex_file.GetLocation();
3198 AppendToBootClassPath(dex_file, dex_cache);
3201 void ClassLinker::AppendToBootClassPath(const DexFile& dex_file,
3202 Handle<mirror::DexCache> dex_cache) {
3203 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation();
3204 boot_class_path_.push_back(&dex_file);
3205 RegisterDexFile(dex_file, dex_cache);
3208 void ClassLinker::RegisterDexFileLocked(const DexFile& dex_file,
3209 Handle<mirror::DexCache> dex_cache) {
3210 Thread* const self = Thread::Current();
3211 dex_lock_.AssertExclusiveHeld(self);
3212 CHECK(dex_cache.Get() != nullptr) << dex_file.GetLocation();
3213 // For app images, the dex cache location may be a suffix of the dex file location since the
3214 // dex file location is an absolute path.
3215 const std::string dex_cache_location = dex_cache->GetLocation()->ToModifiedUtf8();
3216 const size_t dex_cache_length = dex_cache_location.length();
3217 CHECK_GT(dex_cache_length, 0u) << dex_file.GetLocation();
3218 std::string dex_file_location = dex_file.GetLocation();
3219 CHECK_GE(dex_file_location.length(), dex_cache_length)
3220 << dex_cache_location << " " << dex_file.GetLocation();
3222 const std::string dex_file_suffix = dex_file_location.substr(
3223 dex_file_location.length() - dex_cache_length,
3225 // Example dex_cache location is SettingsProvider.apk and
3226 // dex file location is /system/priv-app/SettingsProvider/SettingsProvider.apk
3227 CHECK_EQ(dex_cache_location, dex_file_suffix);
3228 // Clean up pass to remove null dex caches.
3229 // Null dex caches can occur due to class unloading and we are lazily removing null entries.
3230 JavaVMExt* const vm = self->GetJniEnv()->vm;
3231 for (auto it = dex_caches_.begin(); it != dex_caches_.end(); ) {
3232 DexCacheData data = *it;
3233 if (self->IsJWeakCleared(data.weak_root)) {
3234 vm->DeleteWeakGlobalRef(self, data.weak_root);
3235 it = dex_caches_.erase(it);
3240 jweak dex_cache_jweak = vm->AddWeakGlobalRef(self, dex_cache.Get());
3241 dex_cache->SetDexFile(&dex_file);
3243 data.weak_root = dex_cache_jweak;
3244 data.dex_file = dex_cache->GetDexFile();
3245 data.resolved_types = dex_cache->GetResolvedTypes();
3246 dex_caches_.push_back(data);
3249 mirror::DexCache* ClassLinker::RegisterDexFile(const DexFile& dex_file,
3250 mirror::ClassLoader* class_loader) {
3251 Thread* self = Thread::Current();
3253 ReaderMutexLock mu(self, dex_lock_);
3254 mirror::DexCache* dex_cache = FindDexCacheLocked(self, dex_file, true);
3255 if (dex_cache != nullptr) {
3259 LinearAlloc* const linear_alloc = GetOrCreateAllocatorForClassLoader(class_loader);
3260 DCHECK(linear_alloc != nullptr);
3263 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
3264 table = InsertClassTableForClassLoader(class_loader);
3266 // Don't alloc while holding the lock, since allocation may need to
3267 // suspend all threads and another thread may need the dex_lock_ to
3268 // get to a suspend point.
3269 StackHandleScope<1> hs(self);
3270 Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(AllocDexCache(self, dex_file, linear_alloc)));
3272 WriterMutexLock mu(self, dex_lock_);
3273 mirror::DexCache* dex_cache = FindDexCacheLocked(self, dex_file, true);
3274 if (dex_cache != nullptr) {
3277 if (h_dex_cache.Get() == nullptr) {
3278 self->AssertPendingOOMException();
3281 RegisterDexFileLocked(dex_file, h_dex_cache);
3283 table->InsertStrongRoot(h_dex_cache.Get());
3284 return h_dex_cache.Get();
3287 void ClassLinker::RegisterDexFile(const DexFile& dex_file,
3288 Handle<mirror::DexCache> dex_cache) {
3289 WriterMutexLock mu(Thread::Current(), dex_lock_);
3290 RegisterDexFileLocked(dex_file, dex_cache);
3293 mirror::DexCache* ClassLinker::FindDexCache(Thread* self,
3294 const DexFile& dex_file,
3295 bool allow_failure) {
3296 ReaderMutexLock mu(self, dex_lock_);
3297 return FindDexCacheLocked(self, dex_file, allow_failure);
3300 mirror::DexCache* ClassLinker::FindDexCacheLocked(Thread* self,
3301 const DexFile& dex_file,
3302 bool allow_failure) {
3303 // Search assuming unique-ness of dex file.
3304 for (const DexCacheData& data : dex_caches_) {
3305 // Avoid decoding (and read barriers) other unrelated dex caches.
3306 if (data.dex_file == &dex_file) {
3307 mirror::DexCache* dex_cache =
3308 down_cast<mirror::DexCache*>(self->DecodeJObject(data.weak_root));
3309 if (dex_cache != nullptr) {
3316 if (allow_failure) {
3319 std::string location(dex_file.GetLocation());
3320 // Failure, dump diagnostic and abort.
3321 for (const DexCacheData& data : dex_caches_) {
3322 mirror::DexCache* dex_cache = down_cast<mirror::DexCache*>(self->DecodeJObject(data.weak_root));
3323 if (dex_cache != nullptr) {
3324 LOG(ERROR) << "Registered dex file " << dex_cache->GetDexFile()->GetLocation();
3327 LOG(FATAL) << "Failed to find DexCache for DexFile " << location;
3331 void ClassLinker::FixupDexCaches(ArtMethod* resolution_method) {
3332 Thread* const self = Thread::Current();
3333 ReaderMutexLock mu(self, dex_lock_);
3334 for (const DexCacheData& data : dex_caches_) {
3335 if (!self->IsJWeakCleared(data.weak_root)) {
3336 mirror::DexCache* dex_cache = down_cast<mirror::DexCache*>(
3337 self->DecodeJObject(data.weak_root));
3338 if (dex_cache != nullptr) {
3339 dex_cache->Fixup(resolution_method, image_pointer_size_);
3345 mirror::Class* ClassLinker::CreatePrimitiveClass(Thread* self, Primitive::Type type) {
3346 mirror::Class* klass = AllocClass(self, mirror::Class::PrimitiveClassSize(image_pointer_size_));
3347 if (UNLIKELY(klass == nullptr)) {
3348 self->AssertPendingOOMException();
3351 return InitializePrimitiveClass(klass, type);
3354 mirror::Class* ClassLinker::InitializePrimitiveClass(mirror::Class* primitive_class,
3355 Primitive::Type type) {
3356 CHECK(primitive_class != nullptr);
3357 // Must hold lock on object when initializing.
3358 Thread* self = Thread::Current();
3359 StackHandleScope<1> hs(self);
3360 Handle<mirror::Class> h_class(hs.NewHandle(primitive_class));
3361 ObjectLock<mirror::Class> lock(self, h_class);
3362 h_class->SetAccessFlags(kAccPublic | kAccFinal | kAccAbstract);
3363 h_class->SetPrimitiveType(type);
3364 mirror::Class::SetStatus(h_class, mirror::Class::kStatusInitialized, self);
3365 const char* descriptor = Primitive::Descriptor(type);
3366 mirror::Class* existing = InsertClass(descriptor, h_class.Get(),
3367 ComputeModifiedUtf8Hash(descriptor));
3368 CHECK(existing == nullptr) << "InitPrimitiveClass(" << type << ") failed";
3369 return h_class.Get();
3372 // Create an array class (i.e. the class object for the array, not the
3373 // array itself). "descriptor" looks like "[C" or "[[[[B" or
3374 // "[Ljava/lang/String;".
3376 // If "descriptor" refers to an array of primitives, look up the
3377 // primitive type's internally-generated class object.
3379 // "class_loader" is the class loader of the class that's referring to
3380 // us. It's used to ensure that we're looking for the element type in
3381 // the right context. It does NOT become the class loader for the
3382 // array class; that always comes from the base element class.
3384 // Returns null with an exception raised on failure.
3385 mirror::Class* ClassLinker::CreateArrayClass(Thread* self, const char* descriptor, size_t hash,
3386 Handle<mirror::ClassLoader> class_loader) {
3387 // Identify the underlying component type
3388 CHECK_EQ('[', descriptor[0]);
3389 StackHandleScope<2> hs(self);
3390 MutableHandle<mirror::Class> component_type(hs.NewHandle(FindClass(self, descriptor + 1,
3392 if (component_type.Get() == nullptr) {
3393 DCHECK(self->IsExceptionPending());
3394 // We need to accept erroneous classes as component types.
3395 const size_t component_hash = ComputeModifiedUtf8Hash(descriptor + 1);
3396 component_type.Assign(LookupClass(self, descriptor + 1, component_hash, class_loader.Get()));
3397 if (component_type.Get() == nullptr) {
3398 DCHECK(self->IsExceptionPending());
3401 self->ClearException();
3404 if (UNLIKELY(component_type->IsPrimitiveVoid())) {
3405 ThrowNoClassDefFoundError("Attempt to create array of void primitive type");
3408 // See if the component type is already loaded. Array classes are
3409 // always associated with the class loader of their underlying
3410 // element type -- an array of Strings goes with the loader for
3411 // java/lang/String -- so we need to look for it there. (The
3412 // caller should have checked for the existence of the class
3413 // before calling here, but they did so with *their* class loader,
3414 // not the component type's loader.)
3416 // If we find it, the caller adds "loader" to the class' initiating
3417 // loader list, which should prevent us from going through this again.
3419 // This call is unnecessary if "loader" and "component_type->GetClassLoader()"
3420 // are the same, because our caller (FindClass) just did the
3421 // lookup. (Even if we get this wrong we still have correct behavior,
3422 // because we effectively do this lookup again when we add the new
3423 // class to the hash table --- necessary because of possible races with
3425 if (class_loader.Get() != component_type->GetClassLoader()) {
3426 mirror::Class* new_class = LookupClass(self, descriptor, hash, component_type->GetClassLoader());
3427 if (new_class != nullptr) {
3432 // Fill out the fields in the Class.
3434 // It is possible to execute some methods against arrays, because
3435 // all arrays are subclasses of java_lang_Object_, so we need to set
3436 // up a vtable. We can just point at the one in java_lang_Object_.
3438 // Array classes are simple enough that we don't need to do a full
3440 auto new_class = hs.NewHandle<mirror::Class>(nullptr);
3441 if (UNLIKELY(!init_done_)) {
3442 // Classes that were hand created, ie not by FindSystemClass
3443 if (strcmp(descriptor, "[Ljava/lang/Class;") == 0) {
3444 new_class.Assign(GetClassRoot(kClassArrayClass));
3445 } else if (strcmp(descriptor, "[Ljava/lang/Object;") == 0) {
3446 new_class.Assign(GetClassRoot(kObjectArrayClass));
3447 } else if (strcmp(descriptor, GetClassRootDescriptor(kJavaLangStringArrayClass)) == 0) {
3448 new_class.Assign(GetClassRoot(kJavaLangStringArrayClass));
3449 } else if (strcmp(descriptor, "[C") == 0) {
3450 new_class.Assign(GetClassRoot(kCharArrayClass));
3451 } else if (strcmp(descriptor, "[I") == 0) {
3452 new_class.Assign(GetClassRoot(kIntArrayClass));
3453 } else if (strcmp(descriptor, "[J") == 0) {
3454 new_class.Assign(GetClassRoot(kLongArrayClass));
3457 if (new_class.Get() == nullptr) {
3458 new_class.Assign(AllocClass(self, mirror::Array::ClassSize(image_pointer_size_)));
3459 if (new_class.Get() == nullptr) {
3460 self->AssertPendingOOMException();
3463 new_class->SetComponentType(component_type.Get());
3465 ObjectLock<mirror::Class> lock(self, new_class); // Must hold lock on object when initializing.
3466 DCHECK(new_class->GetComponentType() != nullptr);
3467 mirror::Class* java_lang_Object = GetClassRoot(kJavaLangObject);
3468 new_class->SetSuperClass(java_lang_Object);
3469 new_class->SetVTable(java_lang_Object->GetVTable());
3470 new_class->SetPrimitiveType(Primitive::kPrimNot);
3471 new_class->SetClassLoader(component_type->GetClassLoader());
3472 if (component_type->IsPrimitive()) {
3473 new_class->SetClassFlags(mirror::kClassFlagNoReferenceFields);
3475 new_class->SetClassFlags(mirror::kClassFlagObjectArray);
3477 mirror::Class::SetStatus(new_class, mirror::Class::kStatusLoaded, self);
3478 new_class->PopulateEmbeddedVTable(image_pointer_size_);
3479 ImTable* object_imt = java_lang_Object->GetImt(image_pointer_size_);
3480 new_class->SetImt(object_imt, image_pointer_size_);
3481 mirror::Class::SetStatus(new_class, mirror::Class::kStatusInitialized, self);
3482 // don't need to set new_class->SetObjectSize(..)
3483 // because Object::SizeOf delegates to Array::SizeOf
3485 // All arrays have java/lang/Cloneable and java/io/Serializable as
3486 // interfaces. We need to set that up here, so that stuff like
3487 // "instanceof" works right.
3489 // Note: The GC could run during the call to FindSystemClass,
3490 // so we need to make sure the class object is GC-valid while we're in
3491 // there. Do this by clearing the interface list so the GC will just
3492 // think that the entries are null.
3495 // Use the single, global copies of "interfaces" and "iftable"
3496 // (remember not to free them for arrays).
3498 mirror::IfTable* array_iftable = array_iftable_.Read();
3499 CHECK(array_iftable != nullptr);
3500 new_class->SetIfTable(array_iftable);
3503 // Inherit access flags from the component type.
3504 int access_flags = new_class->GetComponentType()->GetAccessFlags();
3505 // Lose any implementation detail flags; in particular, arrays aren't finalizable.
3506 access_flags &= kAccJavaFlagsMask;
3507 // Arrays can't be used as a superclass or interface, so we want to add "abstract final"
3508 // and remove "interface".
3509 access_flags |= kAccAbstract | kAccFinal;
3510 access_flags &= ~kAccInterface;
3512 new_class->SetAccessFlags(access_flags);
3514 mirror::Class* existing = InsertClass(descriptor, new_class.Get(), hash);
3515 if (existing == nullptr) {
3516 jit::Jit::NewTypeLoadedIfUsingJit(new_class.Get());
3517 return new_class.Get();
3519 // Another thread must have loaded the class after we
3520 // started but before we finished. Abandon what we've
3523 // (Yes, this happens.)
3528 mirror::Class* ClassLinker::FindPrimitiveClass(char type) {
3531 return GetClassRoot(kPrimitiveByte);
3533 return GetClassRoot(kPrimitiveChar);
3535 return GetClassRoot(kPrimitiveDouble);
3537 return GetClassRoot(kPrimitiveFloat);
3539 return GetClassRoot(kPrimitiveInt);
3541 return GetClassRoot(kPrimitiveLong);
3543 return GetClassRoot(kPrimitiveShort);
3545 return GetClassRoot(kPrimitiveBoolean);
3547 return GetClassRoot(kPrimitiveVoid);
3551 std::string printable_type(PrintableChar(type));
3552 ThrowNoClassDefFoundError("Not a primitive type: %s", printable_type.c_str());
3556 mirror::Class* ClassLinker::InsertClass(const char* descriptor, mirror::Class* klass, size_t hash) {
3557 if (VLOG_IS_ON(class_linker)) {
3558 mirror::DexCache* dex_cache = klass->GetDexCache();
3560 if (dex_cache != nullptr) {
3562 source += dex_cache->GetLocation()->ToModifiedUtf8();
3564 LOG(INFO) << "Loaded class " << descriptor << source;
3567 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_);
3568 mirror::ClassLoader* const class_loader = klass->GetClassLoader();
3569 ClassTable* const class_table = InsertClassTableForClassLoader(class_loader);
3570 mirror::Class* existing = class_table->Lookup(descriptor, hash);
3571 if (existing != nullptr) {
3574 if (kIsDebugBuild &&
3576 class_loader == nullptr &&
3577 dex_cache_boot_image_class_lookup_required_) {
3578 // Check a class loaded with the system class loader matches one in the image if the class
3580 existing = LookupClassFromBootImage(descriptor);
3581 if (existing != nullptr) {
3582 CHECK_EQ(klass, existing);
3585 VerifyObject(klass);
3586 class_table->InsertWithHash(klass, hash);
3587 if (class_loader != nullptr) {
3588 // This is necessary because we need to have the card dirtied for remembered sets.
3589 Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(class_loader);
3591 if (log_new_class_table_roots_) {
3592 new_class_roots_.push_back(GcRoot<mirror::Class>(klass));
3595 if (kIsDebugBuild) {
3596 // Test that copied methods correctly can find their holder.
3597 for (ArtMethod& method : klass->GetCopiedMethods(image_pointer_size_)) {
3598 CHECK_EQ(GetHoldingClassOfCopiedMethod(&method), klass);
3604 // TODO This should really be in mirror::Class.
3605 void ClassLinker::UpdateClassMethods(mirror::Class* klass,
3606 LengthPrefixedArray<ArtMethod>* new_methods) {
3607 klass->SetMethodsPtrUnchecked(new_methods,
3608 klass->NumDirectMethods(),
3609 klass->NumDeclaredVirtualMethods());
3610 // Need to mark the card so that the remembered sets and mod union tables get updated.
3611 Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(klass);
3614 bool ClassLinker::RemoveClass(const char* descriptor, mirror::ClassLoader* class_loader) {
3615 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_);
3616 ClassTable* const class_table = ClassTableForClassLoader(class_loader);
3617 return class_table != nullptr && class_table->Remove(descriptor);
3620 mirror::Class* ClassLinker::LookupClass(Thread* self,
3621 const char* descriptor,
3623 mirror::ClassLoader* class_loader) {
3625 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_);
3626 ClassTable* const class_table = ClassTableForClassLoader(class_loader);
3627 if (class_table != nullptr) {
3628 mirror::Class* result = class_table->Lookup(descriptor, hash);
3629 if (result != nullptr) {
3634 if (class_loader != nullptr || !dex_cache_boot_image_class_lookup_required_) {
3637 // Lookup failed but need to search dex_caches_.
3638 mirror::Class* result = LookupClassFromBootImage(descriptor);
3639 if (result != nullptr) {
3640 result = InsertClass(descriptor, result, hash);
3642 // Searching the image dex files/caches failed, we don't want to get into this situation
3643 // often as map searches are faster, so after kMaxFailedDexCacheLookups move all image
3644 // classes into the class table.
3645 constexpr uint32_t kMaxFailedDexCacheLookups = 1000;
3646 if (++failed_dex_cache_class_lookups_ > kMaxFailedDexCacheLookups) {
3647 AddBootImageClassesToClassTable();
3653 static std::vector<mirror::ObjectArray<mirror::DexCache>*> GetImageDexCaches(
3654 std::vector<gc::space::ImageSpace*> image_spaces) SHARED_REQUIRES(Locks::mutator_lock_) {
3655 CHECK(!image_spaces.empty());
3656 std::vector<mirror::ObjectArray<mirror::DexCache>*> dex_caches_vector;
3657 for (gc::space::ImageSpace* image_space : image_spaces) {
3658 mirror::Object* root = image_space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches);
3659 DCHECK(root != nullptr);
3660 dex_caches_vector.push_back(root->AsObjectArray<mirror::DexCache>());
3662 return dex_caches_vector;
3665 void ClassLinker::AddBootImageClassesToClassTable() {
3666 if (dex_cache_boot_image_class_lookup_required_) {
3667 AddImageClassesToClassTable(Runtime::Current()->GetHeap()->GetBootImageSpaces(),
3668 /*class_loader*/nullptr);
3669 dex_cache_boot_image_class_lookup_required_ = false;
3673 void ClassLinker::AddImageClassesToClassTable(std::vector<gc::space::ImageSpace*> image_spaces,
3674 mirror::ClassLoader* class_loader) {
3675 Thread* self = Thread::Current();
3676 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
3677 ScopedAssertNoThreadSuspension ants(self, "Moving image classes to class table");
3679 ClassTable* const class_table = InsertClassTableForClassLoader(class_loader);
3682 std::vector<mirror::ObjectArray<mirror::DexCache>*> dex_caches_vector =
3683 GetImageDexCaches(image_spaces);
3684 for (mirror::ObjectArray<mirror::DexCache>* dex_caches : dex_caches_vector) {
3685 for (int32_t i = 0; i < dex_caches->GetLength(); i++) {
3686 mirror::DexCache* dex_cache = dex_caches->Get(i);
3687 GcRoot<mirror::Class>* types = dex_cache->GetResolvedTypes();
3688 for (int32_t j = 0, num_types = dex_cache->NumResolvedTypes(); j < num_types; j++) {
3689 mirror::Class* klass = types[j].Read();
3690 if (klass != nullptr) {
3691 DCHECK_EQ(klass->GetClassLoader(), class_loader);
3692 const char* descriptor = klass->GetDescriptor(&temp);
3693 size_t hash = ComputeModifiedUtf8Hash(descriptor);
3694 mirror::Class* existing = class_table->Lookup(descriptor, hash);
3695 if (existing != nullptr) {
3696 CHECK_EQ(existing, klass) << PrettyClassAndClassLoader(existing) << " != "
3697 << PrettyClassAndClassLoader(klass);
3699 class_table->Insert(klass);
3700 if (log_new_class_table_roots_) {
3701 new_class_roots_.push_back(GcRoot<mirror::Class>(klass));
3710 class MoveClassTableToPreZygoteVisitor : public ClassLoaderVisitor {
3712 explicit MoveClassTableToPreZygoteVisitor() {}
3714 void Visit(mirror::ClassLoader* class_loader)
3715 REQUIRES(Locks::classlinker_classes_lock_)
3716 SHARED_REQUIRES(Locks::mutator_lock_) OVERRIDE {
3717 ClassTable* const class_table = class_loader->GetClassTable();
3718 if (class_table != nullptr) {
3719 class_table->FreezeSnapshot();
3724 void ClassLinker::MoveClassTableToPreZygote() {
3725 WriterMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_);
3726 boot_class_table_.FreezeSnapshot();
3727 MoveClassTableToPreZygoteVisitor visitor;
3728 VisitClassLoaders(&visitor);
3731 mirror::Class* ClassLinker::LookupClassFromBootImage(const char* descriptor) {
3732 ScopedAssertNoThreadSuspension ants(Thread::Current(), "Image class lookup");
3733 std::vector<mirror::ObjectArray<mirror::DexCache>*> dex_caches_vector =
3734 GetImageDexCaches(Runtime::Current()->GetHeap()->GetBootImageSpaces());
3735 for (mirror::ObjectArray<mirror::DexCache>* dex_caches : dex_caches_vector) {
3736 for (int32_t i = 0; i < dex_caches->GetLength(); ++i) {
3737 mirror::DexCache* dex_cache = dex_caches->Get(i);
3738 const DexFile* dex_file = dex_cache->GetDexFile();
3739 // Try binary searching the type index by descriptor.
3740 const DexFile::TypeId* type_id = dex_file->FindTypeId(descriptor);
3741 if (type_id != nullptr) {
3742 uint16_t type_idx = dex_file->GetIndexForTypeId(*type_id);
3743 mirror::Class* klass = dex_cache->GetResolvedType(type_idx);
3744 if (klass != nullptr) {
3753 // Look up classes by hash and descriptor and put all matching ones in the result array.
3754 class LookupClassesVisitor : public ClassLoaderVisitor {
3756 LookupClassesVisitor(const char* descriptor, size_t hash, std::vector<mirror::Class*>* result)
3757 : descriptor_(descriptor),
3761 void Visit(mirror::ClassLoader* class_loader)
3762 SHARED_REQUIRES(Locks::classlinker_classes_lock_, Locks::mutator_lock_) OVERRIDE {
3763 ClassTable* const class_table = class_loader->GetClassTable();
3764 mirror::Class* klass = class_table->Lookup(descriptor_, hash_);
3765 if (klass != nullptr) {
3766 result_->push_back(klass);
3771 const char* const descriptor_;
3773 std::vector<mirror::Class*>* const result_;
3776 void ClassLinker::LookupClasses(const char* descriptor, std::vector<mirror::Class*>& result) {
3778 if (dex_cache_boot_image_class_lookup_required_) {
3779 AddBootImageClassesToClassTable();
3781 Thread* const self = Thread::Current();
3782 ReaderMutexLock mu(self, *Locks::classlinker_classes_lock_);
3783 const size_t hash = ComputeModifiedUtf8Hash(descriptor);
3784 mirror::Class* klass = boot_class_table_.Lookup(descriptor, hash);
3785 if (klass != nullptr) {
3786 result.push_back(klass);
3788 LookupClassesVisitor visitor(descriptor, hash, &result);
3789 VisitClassLoaders(&visitor);
3792 bool ClassLinker::AttemptSupertypeVerification(Thread* self,
3793 Handle<mirror::Class> klass,
3794 Handle<mirror::Class> supertype) {
3795 DCHECK(self != nullptr);
3796 DCHECK(klass.Get() != nullptr);
3797 DCHECK(supertype.Get() != nullptr);
3799 if (!supertype->IsVerified() && !supertype->IsErroneous()) {
3800 VerifyClass(self, supertype);
3802 if (supertype->IsCompileTimeVerified()) {
3803 // Either we are verified or we soft failed and need to retry at runtime.
3806 // If we got this far then we have a hard failure.
3807 std::string error_msg =
3808 StringPrintf("Rejecting class %s that attempts to sub-type erroneous class %s",
3809 PrettyDescriptor(klass.Get()).c_str(),
3810 PrettyDescriptor(supertype.Get()).c_str());
3811 LOG(WARNING) << error_msg << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8();
3812 StackHandleScope<1> hs(self);
3813 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException()));
3814 if (cause.Get() != nullptr) {
3815 // Set during VerifyClass call (if at all).
3816 self->ClearException();
3818 // Change into a verify error.
3819 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str());
3820 if (cause.Get() != nullptr) {
3821 self->GetException()->SetCause(cause.Get());
3823 ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex());
3824 if (Runtime::Current()->IsAotCompiler()) {
3825 Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref);
3827 // Need to grab the lock to change status.
3828 ObjectLock<mirror::Class> super_lock(self, klass);
3829 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
3833 void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass, LogSeverity log_level) {
3835 // TODO: assert that the monitor on the Class is held
3836 ObjectLock<mirror::Class> lock(self, klass);
3838 // Is somebody verifying this now?
3839 mirror::Class::Status old_status = klass->GetStatus();
3840 while (old_status == mirror::Class::kStatusVerifying ||
3841 old_status == mirror::Class::kStatusVerifyingAtRuntime) {
3842 lock.WaitIgnoringInterrupts();
3843 CHECK(klass->IsErroneous() || (klass->GetStatus() > old_status))
3844 << "Class '" << PrettyClass(klass.Get()) << "' performed an illegal verification state "
3845 << "transition from " << old_status << " to " << klass->GetStatus();
3846 old_status = klass->GetStatus();
3849 // The class might already be erroneous, for example at compile time if we attempted to verify
3850 // this class as a parent to another.
3851 if (klass->IsErroneous()) {
3852 ThrowEarlierClassFailure(klass.Get());
3856 // Don't attempt to re-verify if already sufficiently verified.
3857 if (klass->IsVerified()) {
3858 EnsureSkipAccessChecksMethods(klass);
3861 if (klass->IsCompileTimeVerified() && Runtime::Current()->IsAotCompiler()) {
3865 if (klass->GetStatus() == mirror::Class::kStatusResolved) {
3866 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerifying, self);
3868 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime)
3869 << PrettyClass(klass.Get());
3870 CHECK(!Runtime::Current()->IsAotCompiler());
3871 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerifyingAtRuntime, self);
3874 // Skip verification if disabled.
3875 if (!Runtime::Current()->IsVerificationEnabled()) {
3876 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerified, self);
3877 EnsureSkipAccessChecksMethods(klass);
3882 // Verify super class.
3883 StackHandleScope<2> hs(self);
3884 MutableHandle<mirror::Class> supertype(hs.NewHandle(klass->GetSuperClass()));
3885 // If we have a superclass and we get a hard verification failure we can return immediately.
3886 if (supertype.Get() != nullptr && !AttemptSupertypeVerification(self, klass, supertype)) {
3887 CHECK(self->IsExceptionPending()) << "Verification error should be pending.";
3891 // Verify all default super-interfaces.
3893 // (1) Don't bother if the superclass has already had a soft verification failure.
3895 // (2) Interfaces shouldn't bother to do this recursive verification because they cannot cause
3896 // recursive initialization by themselves. This is because when an interface is initialized
3897 // directly it must not initialize its superinterfaces. We are allowed to verify regardless
3898 // but choose not to for an optimization. If the interfaces is being verified due to a class
3899 // initialization (which would need all the default interfaces to be verified) the class code
3900 // will trigger the recursive verification anyway.
3901 if ((supertype.Get() == nullptr || supertype->IsVerified()) // See (1)
3902 && !klass->IsInterface()) { // See (2)
3903 int32_t iftable_count = klass->GetIfTableCount();
3904 MutableHandle<mirror::Class> iface(hs.NewHandle<mirror::Class>(nullptr));
3905 // Loop through all interfaces this class has defined. It doesn't matter the order.
3906 for (int32_t i = 0; i < iftable_count; i++) {
3907 iface.Assign(klass->GetIfTable()->GetInterface(i));
3908 DCHECK(iface.Get() != nullptr);
3909 // We only care if we have default interfaces and can skip if we are already verified...
3910 if (LIKELY(!iface->HasDefaultMethods() || iface->IsVerified())) {
3912 } else if (UNLIKELY(!AttemptSupertypeVerification(self, klass, iface))) {
3913 // We had a hard failure while verifying this interface. Just return immediately.
3914 CHECK(self->IsExceptionPending()) << "Verification error should be pending.";
3916 } else if (UNLIKELY(!iface->IsVerified())) {
3917 // We softly failed to verify the iface. Stop checking and clean up.
3918 // Put the iface into the supertype handle so we know what caused us to fail.
3919 supertype.Assign(iface.Get());
3925 // At this point if verification failed, then supertype is the "first" supertype that failed
3926 // verification (without a specific order). If verification succeeded, then supertype is either
3927 // null or the original superclass of klass and is verified.
3928 DCHECK(supertype.Get() == nullptr ||
3929 supertype.Get() == klass->GetSuperClass() ||
3930 !supertype->IsVerified());
3932 // Try to use verification information from the oat file, otherwise do runtime verification.
3933 const DexFile& dex_file = *klass->GetDexCache()->GetDexFile();
3934 mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady);
3935 bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status);
3936 // If the oat file says the class had an error, re-run the verifier. That way we will get a
3937 // precise error message. To ensure a rerun, test:
3938 // oat_file_class_status == mirror::Class::kStatusError => !preverified
3939 DCHECK(!(oat_file_class_status == mirror::Class::kStatusError) || !preverified);
3941 verifier::MethodVerifier::FailureKind verifier_failure = verifier::MethodVerifier::kNoFailure;
3942 std::string error_msg;
3944 Runtime* runtime = Runtime::Current();
3945 verifier_failure = verifier::MethodVerifier::VerifyClass(self,
3947 runtime->GetCompilerCallbacks(),
3948 runtime->IsAotCompiler(),
3953 // Verification is done, grab the lock again.
3954 ObjectLock<mirror::Class> lock(self, klass);
3956 if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) {
3957 if (!preverified && verifier_failure != verifier::MethodVerifier::kNoFailure) {
3958 VLOG(class_linker) << "Soft verification failure in class " << PrettyDescriptor(klass.Get())
3959 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8()
3960 << " because: " << error_msg;
3962 self->AssertNoPendingException();
3963 // Make sure all classes referenced by catch blocks are resolved.
3964 ResolveClassExceptionHandlerTypes(klass);
3965 if (verifier_failure == verifier::MethodVerifier::kNoFailure) {
3966 // Even though there were no verifier failures we need to respect whether the super-class and
3967 // super-default-interfaces were verified or requiring runtime reverification.
3968 if (supertype.Get() == nullptr || supertype->IsVerified()) {
3969 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerified, self);
3971 CHECK_EQ(supertype->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime);
3972 mirror::Class::SetStatus(klass, mirror::Class::kStatusRetryVerificationAtRuntime, self);
3973 // Pretend a soft failure occurred so that we don't consider the class verified below.
3974 verifier_failure = verifier::MethodVerifier::kSoftFailure;
3977 CHECK_EQ(verifier_failure, verifier::MethodVerifier::kSoftFailure);
3978 // Soft failures at compile time should be retried at runtime. Soft
3979 // failures at runtime will be handled by slow paths in the generated
3980 // code. Set status accordingly.
3981 if (Runtime::Current()->IsAotCompiler()) {
3982 mirror::Class::SetStatus(klass, mirror::Class::kStatusRetryVerificationAtRuntime, self);
3984 mirror::Class::SetStatus(klass, mirror::Class::kStatusVerified, self);
3985 // As this is a fake verified status, make sure the methods are _not_ marked
3986 // kAccSkipAccessChecks later.
3987 klass->SetVerificationAttempted();
3991 VLOG(verifier) << "Verification failed on class " << PrettyDescriptor(klass.Get())
3992 << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8()
3993 << " because: " << error_msg;
3994 self->AssertNoPendingException();
3995 ThrowVerifyError(klass.Get(), "%s", error_msg.c_str());
3996 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
3998 if (preverified || verifier_failure == verifier::MethodVerifier::kNoFailure) {
3999 // Class is verified so we don't need to do any access check on its methods.
4000 // Let the interpreter know it by setting the kAccSkipAccessChecks flag onto each
4002 // Note: we're going here during compilation and at runtime. When we set the
4003 // kAccSkipAccessChecks flag when compiling image classes, the flag is recorded
4004 // in the image and is set when loading the image.
4006 if (UNLIKELY(Runtime::Current()->IsVerificationSoftFail())) {
4007 // Never skip access checks if the verification soft fail is forced.
4008 // Mark the class as having a verification attempt to avoid re-running the verifier.
4009 klass->SetVerificationAttempted();
4011 EnsureSkipAccessChecksMethods(klass);
4016 void ClassLinker::EnsureSkipAccessChecksMethods(Handle<mirror::Class> klass) {
4017 if (!klass->WasVerificationAttempted()) {
4018 klass->SetSkipAccessChecksFlagOnAllMethods(image_pointer_size_);
4019 klass->SetVerificationAttempted();
4023 bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file,
4024 mirror::Class* klass,
4025 mirror::Class::Status& oat_file_class_status) {
4026 // If we're compiling, we can only verify the class using the oat file if
4027 // we are not compiling the image or if the class we're verifying is not part of
4028 // the app. In other words, we will only check for preverification of bootclasspath
4030 if (Runtime::Current()->IsAotCompiler()) {
4031 // Are we compiling the bootclasspath?
4032 if (Runtime::Current()->GetCompilerCallbacks()->IsBootImage()) {
4035 // We are compiling an app (not the image).
4037 // Is this an app class? (I.e. not a bootclasspath class)
4038 if (klass->GetClassLoader() != nullptr) {
4043 const OatFile::OatDexFile* oat_dex_file = dex_file.GetOatDexFile();
4044 // In case we run without an image there won't be a backing oat file.
4045 if (oat_dex_file == nullptr) {
4049 // We may be running with a preopted oat file but without image. In this case,
4050 // we don't skip verification of skip_access_checks classes to ensure we initialize
4051 // dex caches with all types resolved during verification.
4052 // We need to trust image classes, as these might be coming out of a pre-opted, quickened boot
4053 // image (that we just failed loading), and the verifier can't be run on quickened opcodes when
4054 // the runtime isn't started. On the other hand, app classes can be re-verified even if they are
4055 // already pre-opted, as then the runtime is started.
4056 if (!Runtime::Current()->IsAotCompiler() &&
4057 !Runtime::Current()->GetHeap()->HasBootImageSpace() &&
4058 klass->GetClassLoader() != nullptr) {
4062 uint16_t class_def_index = klass->GetDexClassDefIndex();
4063 oat_file_class_status = oat_dex_file->GetOatClass(class_def_index).GetStatus();
4064 if (oat_file_class_status == mirror::Class::kStatusVerified ||
4065 oat_file_class_status == mirror::Class::kStatusInitialized) {
4068 // If we only verified a subset of the classes at compile time, we can end up with classes that
4069 // were resolved by the verifier.
4070 if (oat_file_class_status == mirror::Class::kStatusResolved) {
4073 if (oat_file_class_status == mirror::Class::kStatusRetryVerificationAtRuntime) {
4074 // Compile time verification failed with a soft error. Compile time verification can fail
4075 // because we have incomplete type information. Consider the following:
4080 // v1 gets assigned a type of resolved class Foo
4082 // v1 gets assigned a type of unresolved class Bar
4086 // when we merge v1 following the if-the-else it results in Conflict
4087 // (see verifier::RegType::Merge) as we can't know the type of Bar and we could possibly be
4088 // allowing an unsafe assignment to the field x in the iput (javac may have compiled this as
4089 // it knew Bar was a sub-class of Foo, but for us this may have been moved into a separate apk
4090 // at compile time).
4093 if (oat_file_class_status == mirror::Class::kStatusError) {
4094 // Compile time verification failed with a hard error. This is caused by invalid instructions
4095 // in the class. These errors are unrecoverable.
4098 if (oat_file_class_status == mirror::Class::kStatusNotReady) {
4099 // Status is uninitialized if we couldn't determine the status at compile time, for example,
4100 // not loading the class.
4101 // TODO: when the verifier doesn't rely on Class-es failing to resolve/load the type hierarchy
4102 // isn't a problem and this case shouldn't occur
4106 LOG(FATAL) << "Unexpected class status: " << oat_file_class_status
4107 << " " << dex_file.GetLocation() << " " << PrettyClass(klass) << " "
4108 << klass->GetDescriptor(&temp);
4112 void ClassLinker::ResolveClassExceptionHandlerTypes(Handle<mirror::Class> klass) {
4113 for (ArtMethod& method : klass->GetMethods(image_pointer_size_)) {
4114 ResolveMethodExceptionHandlerTypes(&method);
4118 void ClassLinker::ResolveMethodExceptionHandlerTypes(ArtMethod* method) {
4119 // similar to DexVerifier::ScanTryCatchBlocks and dex2oat's ResolveExceptionsForMethod.
4120 const DexFile::CodeItem* code_item =
4121 method->GetDexFile()->GetCodeItem(method->GetCodeItemOffset());
4122 if (code_item == nullptr) {
4123 return; // native or abstract method
4125 if (code_item->tries_size_ == 0) {
4126 return; // nothing to process
4128 const uint8_t* handlers_ptr = DexFile::GetCatchHandlerData(*code_item, 0);
4129 uint32_t handlers_size = DecodeUnsignedLeb128(&handlers_ptr);
4130 for (uint32_t idx = 0; idx < handlers_size; idx++) {
4131 CatchHandlerIterator iterator(handlers_ptr);
4132 for (; iterator.HasNext(); iterator.Next()) {
4133 // Ensure exception types are resolved so that they don't need resolution to be delivered,
4134 // unresolved exception types will be ignored by exception delivery
4135 if (iterator.GetHandlerTypeIndex() != DexFile::kDexNoIndex16) {
4136 mirror::Class* exception_type = ResolveType(iterator.GetHandlerTypeIndex(), method);
4137 if (exception_type == nullptr) {
4138 DCHECK(Thread::Current()->IsExceptionPending());
4139 Thread::Current()->ClearException();
4143 handlers_ptr = iterator.EndDataPointer();
4147 mirror::Class* ClassLinker::CreateProxyClass(ScopedObjectAccessAlreadyRunnable& soa,
4149 jobjectArray interfaces,
4151 jobjectArray methods,
4152 jobjectArray throws) {
4153 Thread* self = soa.Self();
4154 StackHandleScope<10> hs(self);
4155 MutableHandle<mirror::Class> klass(hs.NewHandle(
4156 AllocClass(self, GetClassRoot(kJavaLangClass), sizeof(mirror::Class))));
4157 if (klass.Get() == nullptr) {
4158 CHECK(self->IsExceptionPending()); // OOME.
4161 DCHECK(klass->GetClass() != nullptr);
4162 klass->SetObjectSize(sizeof(mirror::Proxy));
4163 // Set the class access flags incl. VerificationAttempted, so we do not try to set the flag on
4165 klass->SetAccessFlags(kAccClassIsProxy | kAccPublic | kAccFinal | kAccVerificationAttempted);
4166 klass->SetClassLoader(soa.Decode<mirror::ClassLoader*>(loader));
4167 DCHECK_EQ(klass->GetPrimitiveType(), Primitive::kPrimNot);
4168 klass->SetName(soa.Decode<mirror::String*>(name));
4169 klass->SetDexCache(GetClassRoot(kJavaLangReflectProxy)->GetDexCache());
4170 mirror::Class::SetStatus(klass, mirror::Class::kStatusIdx, self);
4171 std::string descriptor(GetDescriptorForProxy(klass.Get()));
4172 const size_t hash = ComputeModifiedUtf8Hash(descriptor.c_str());
4174 // Needs to be before we insert the class so that the allocator field is set.
4175 LinearAlloc* const allocator = GetOrCreateAllocatorForClassLoader(klass->GetClassLoader());
4177 // Insert the class before loading the fields as the field roots
4178 // (ArtField::declaring_class_) are only visited from the class
4179 // table. There can't be any suspend points between inserting the
4180 // class and setting the field arrays below.
4181 mirror::Class* existing = InsertClass(descriptor.c_str(), klass.Get(), hash);
4182 CHECK(existing == nullptr);
4184 // Instance fields are inherited, but we add a couple of static fields...
4185 const size_t num_fields = 2;
4186 LengthPrefixedArray<ArtField>* sfields = AllocArtFieldArray(self, allocator, num_fields);
4187 klass->SetSFieldsPtr(sfields);
4189 // 1. Create a static field 'interfaces' that holds the _declared_ interfaces implemented by
4190 // our proxy, so Class.getInterfaces doesn't return the flattened set.
4191 ArtField& interfaces_sfield = sfields->At(0);
4192 interfaces_sfield.SetDexFieldIndex(0);
4193 interfaces_sfield.SetDeclaringClass(klass.Get());
4194 interfaces_sfield.SetAccessFlags(kAccStatic | kAccPublic | kAccFinal);
4196 // 2. Create a static field 'throws' that holds exceptions thrown by our methods.
4197 ArtField& throws_sfield = sfields->At(1);
4198 throws_sfield.SetDexFieldIndex(1);
4199 throws_sfield.SetDeclaringClass(klass.Get());
4200 throws_sfield.SetAccessFlags(kAccStatic | kAccPublic | kAccFinal);
4202 // Proxies have 1 direct method, the constructor
4203 const size_t num_direct_methods = 1;
4205 // They have as many virtual methods as the array
4206 auto h_methods = hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Method>*>(methods));
4207 DCHECK_EQ(h_methods->GetClass(), mirror::Method::ArrayClass())
4208 << PrettyClass(h_methods->GetClass());
4209 const size_t num_virtual_methods = h_methods->GetLength();
4211 // Create the methods array.
4212 LengthPrefixedArray<ArtMethod>* proxy_class_methods = AllocArtMethodArray(
4213 self, allocator, num_direct_methods + num_virtual_methods);
4214 // Currently AllocArtMethodArray cannot return null, but the OOM logic is left there in case we
4215 // want to throw OOM in the future.
4216 if (UNLIKELY(proxy_class_methods == nullptr)) {
4217 self->AssertPendingOOMException();
4220 klass->SetMethodsPtr(proxy_class_methods, num_direct_methods, num_virtual_methods);
4222 // Create the single direct method.
4223 CreateProxyConstructor(klass, klass->GetDirectMethodUnchecked(0, image_pointer_size_));
4225 // Create virtual method using specified prototypes.
4226 // TODO These should really use the iterators.
4227 for (size_t i = 0; i < num_virtual_methods; ++i) {
4228 auto* virtual_method = klass->GetVirtualMethodUnchecked(i, image_pointer_size_);
4229 auto* prototype = h_methods->Get(i)->GetArtMethod();
4230 CreateProxyMethod(klass, prototype, virtual_method);
4231 DCHECK(virtual_method->GetDeclaringClass() != nullptr);
4232 DCHECK(prototype->GetDeclaringClass() != nullptr);
4235 // The super class is java.lang.reflect.Proxy
4236 klass->SetSuperClass(GetClassRoot(kJavaLangReflectProxy));
4237 // Now effectively in the loaded state.
4238 mirror::Class::SetStatus(klass, mirror::Class::kStatusLoaded, self);
4239 self->AssertNoPendingException();
4241 MutableHandle<mirror::Class> new_class = hs.NewHandle<mirror::Class>(nullptr);
4243 // Must hold lock on object when resolved.
4244 ObjectLock<mirror::Class> resolution_lock(self, klass);
4245 // Link the fields and virtual methods, creating vtable and iftables.
4246 // The new class will replace the old one in the class table.
4247 Handle<mirror::ObjectArray<mirror::Class>> h_interfaces(
4248 hs.NewHandle(soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces)));
4249 if (!LinkClass(self, descriptor.c_str(), klass, h_interfaces, &new_class)) {
4250 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
4254 CHECK(klass->IsRetired());
4255 CHECK_NE(klass.Get(), new_class.Get());
4256 klass.Assign(new_class.Get());
4258 CHECK_EQ(interfaces_sfield.GetDeclaringClass(), klass.Get());
4259 interfaces_sfield.SetObject<false>(klass.Get(),
4260 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces));
4261 CHECK_EQ(throws_sfield.GetDeclaringClass(), klass.Get());
4262 throws_sfield.SetObject<false>(
4263 klass.Get(), soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class> >*>(throws));
4266 // Lock on klass is released. Lock new class object.
4267 ObjectLock<mirror::Class> initialization_lock(self, klass);
4268 mirror::Class::SetStatus(klass, mirror::Class::kStatusInitialized, self);
4272 if (kIsDebugBuild) {
4273 CHECK(klass->GetIFieldsPtr() == nullptr);
4274 CheckProxyConstructor(klass->GetDirectMethod(0, image_pointer_size_));
4276 for (size_t i = 0; i < num_virtual_methods; ++i) {
4277 auto* virtual_method = klass->GetVirtualMethodUnchecked(i, image_pointer_size_);
4278 auto* prototype = h_methods->Get(i++)->GetArtMethod();
4279 CheckProxyMethod(virtual_method, prototype);
4282 StackHandleScope<1> hs2(self);
4283 Handle<mirror::String> decoded_name = hs2.NewHandle(soa.Decode<mirror::String*>(name));
4284 std::string interfaces_field_name(StringPrintf("java.lang.Class[] %s.interfaces",
4285 decoded_name->ToModifiedUtf8().c_str()));
4286 CHECK_EQ(PrettyField(klass->GetStaticField(0)), interfaces_field_name);
4288 std::string throws_field_name(StringPrintf("java.lang.Class[][] %s.throws",
4289 decoded_name->ToModifiedUtf8().c_str()));
4290 CHECK_EQ(PrettyField(klass->GetStaticField(1)), throws_field_name);
4292 CHECK_EQ(klass.Get()->GetInterfaces(),
4293 soa.Decode<mirror::ObjectArray<mirror::Class>*>(interfaces));
4294 CHECK_EQ(klass.Get()->GetThrows(),
4295 soa.Decode<mirror::ObjectArray<mirror::ObjectArray<mirror::Class>>*>(throws));
4300 std::string ClassLinker::GetDescriptorForProxy(mirror::Class* proxy_class) {
4301 DCHECK(proxy_class->IsProxyClass());
4302 mirror::String* name = proxy_class->GetName();
4303 DCHECK(name != nullptr);
4304 return DotToDescriptor(name->ToModifiedUtf8().c_str());
4307 ArtMethod* ClassLinker::FindMethodForProxy(mirror::Class* proxy_class, ArtMethod* proxy_method) {
4308 DCHECK(proxy_class->IsProxyClass());
4309 DCHECK(proxy_method->IsProxyMethod());
4311 Thread* const self = Thread::Current();
4312 ReaderMutexLock mu(self, dex_lock_);
4313 // Locate the dex cache of the original interface/Object
4314 for (const DexCacheData& data : dex_caches_) {
4315 if (!self->IsJWeakCleared(data.weak_root) &&
4316 proxy_method->HasSameDexCacheResolvedTypes(data.resolved_types,
4317 image_pointer_size_)) {
4318 mirror::DexCache* dex_cache = down_cast<mirror::DexCache*>(
4319 self->DecodeJObject(data.weak_root));
4320 if (dex_cache != nullptr) {
4321 ArtMethod* resolved_method = dex_cache->GetResolvedMethod(
4322 proxy_method->GetDexMethodIndex(), image_pointer_size_);
4323 CHECK(resolved_method != nullptr);
4324 return resolved_method;
4329 LOG(FATAL) << "Didn't find dex cache for " << PrettyClass(proxy_class) << " "
4330 << PrettyMethod(proxy_method);
4334 void ClassLinker::CreateProxyConstructor(Handle<mirror::Class> klass, ArtMethod* out) {
4335 // Create constructor for Proxy that must initialize the method.
4336 CHECK_EQ(GetClassRoot(kJavaLangReflectProxy)->NumDirectMethods(), 18u);
4337 ArtMethod* proxy_constructor = GetClassRoot(kJavaLangReflectProxy)->GetDirectMethodUnchecked(
4338 2, image_pointer_size_);
4339 DCHECK_EQ(std::string(proxy_constructor->GetName()), "<init>");
4340 // Ensure constructor is in dex cache so that we can use the dex cache to look up the overridden
4341 // constructor method.
4342 GetClassRoot(kJavaLangReflectProxy)->GetDexCache()->SetResolvedMethod(
4343 proxy_constructor->GetDexMethodIndex(), proxy_constructor, image_pointer_size_);
4344 // Clone the existing constructor of Proxy (our constructor would just invoke it so steal its
4346 DCHECK(out != nullptr);
4347 out->CopyFrom(proxy_constructor, image_pointer_size_);
4348 // Make this constructor public and fix the class to be our Proxy version
4349 out->SetAccessFlags((out->GetAccessFlags() & ~kAccProtected) | kAccPublic);
4350 out->SetDeclaringClass(klass.Get());
4353 void ClassLinker::CheckProxyConstructor(ArtMethod* constructor) const {
4354 CHECK(constructor->IsConstructor());
4355 auto* np = constructor->GetInterfaceMethodIfProxy(image_pointer_size_);
4356 CHECK_STREQ(np->GetName(), "<init>");
4357 CHECK_STREQ(np->GetSignature().ToString().c_str(), "(Ljava/lang/reflect/InvocationHandler;)V");
4358 DCHECK(constructor->IsPublic());
4361 void ClassLinker::CreateProxyMethod(Handle<mirror::Class> klass, ArtMethod* prototype,
4363 // Ensure prototype is in dex cache so that we can use the dex cache to look up the overridden
4365 auto* dex_cache = prototype->GetDeclaringClass()->GetDexCache();
4366 // Avoid dirtying the dex cache unless we need to.
4367 if (dex_cache->GetResolvedMethod(prototype->GetDexMethodIndex(), image_pointer_size_) !=
4369 dex_cache->SetResolvedMethod(
4370 prototype->GetDexMethodIndex(), prototype, image_pointer_size_);
4372 // We steal everything from the prototype (such as DexCache, invoke stub, etc.) then specialize
4374 DCHECK(out != nullptr);
4375 out->CopyFrom(prototype, image_pointer_size_);
4377 // Set class to be the concrete proxy class.
4378 out->SetDeclaringClass(klass.Get());
4379 // Clear the abstract, default and conflict flags to ensure that defaults aren't picked in
4380 // preference to the invocation handler.
4381 const uint32_t kRemoveFlags = kAccAbstract | kAccDefault | kAccDefaultConflict;
4382 // Make the method final.
4383 const uint32_t kAddFlags = kAccFinal;
4384 out->SetAccessFlags((out->GetAccessFlags() & ~kRemoveFlags) | kAddFlags);
4386 // Clear the dex_code_item_offset_. It needs to be 0 since proxy methods have no CodeItems but the
4387 // method they copy might (if it's a default method).
4388 out->SetCodeItemOffset(0);
4390 // At runtime the method looks like a reference and argument saving method, clone the code
4391 // related parameters from this method.
4392 out->SetEntryPointFromQuickCompiledCode(GetQuickProxyInvokeHandler());
4395 void ClassLinker::CheckProxyMethod(ArtMethod* method, ArtMethod* prototype) const {
4397 CHECK(!prototype->IsFinal());
4398 CHECK(method->IsFinal());
4399 CHECK(method->IsInvokable());
4401 // The proxy method doesn't have its own dex cache or dex file and so it steals those of its
4402 // interface prototype. The exception to this are Constructors and the Class of the Proxy itself.
4403 CHECK(prototype->HasSameDexCacheResolvedMethods(method, image_pointer_size_));
4404 CHECK(prototype->HasSameDexCacheResolvedTypes(method, image_pointer_size_));
4405 auto* np = method->GetInterfaceMethodIfProxy(image_pointer_size_);
4406 CHECK_EQ(prototype->GetDeclaringClass()->GetDexCache(), np->GetDexCache());
4407 CHECK_EQ(prototype->GetDexMethodIndex(), method->GetDexMethodIndex());
4409 CHECK_STREQ(np->GetName(), prototype->GetName());
4410 CHECK_STREQ(np->GetShorty(), prototype->GetShorty());
4411 // More complex sanity - via dex cache
4412 CHECK_EQ(np->GetReturnType(true /* resolve */, image_pointer_size_),
4413 prototype->GetReturnType(true /* resolve */, image_pointer_size_));
4416 bool ClassLinker::CanWeInitializeClass(mirror::Class* klass, bool can_init_statics,
4417 bool can_init_parents) {
4418 if (can_init_statics && can_init_parents) {
4421 if (!can_init_statics) {
4422 // Check if there's a class initializer.
4423 ArtMethod* clinit = klass->FindClassInitializer(image_pointer_size_);
4424 if (clinit != nullptr) {
4427 // Check if there are encoded static values needing initialization.
4428 if (klass->NumStaticFields() != 0) {
4429 const DexFile::ClassDef* dex_class_def = klass->GetClassDef();
4430 DCHECK(dex_class_def != nullptr);
4431 if (dex_class_def->static_values_off_ != 0) {
4435 // If we are a class we need to initialize all interfaces with default methods when we are
4436 // initialized. Check all of them.
4437 if (!klass->IsInterface()) {
4438 size_t num_interfaces = klass->GetIfTableCount();
4439 for (size_t i = 0; i < num_interfaces; i++) {
4440 mirror::Class* iface = klass->GetIfTable()->GetInterface(i);
4441 if (iface->HasDefaultMethods() &&
4442 !CanWeInitializeClass(iface, can_init_statics, can_init_parents)) {
4448 if (klass->IsInterface() || !klass->HasSuperClass()) {
4451 mirror::Class* super_class = klass->GetSuperClass();
4452 if (!can_init_parents && !super_class->IsInitialized()) {
4455 return CanWeInitializeClass(super_class, can_init_statics, can_init_parents);
4458 bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass,
4459 bool can_init_statics, bool can_init_parents) {
4460 // see JLS 3rd edition, 12.4.2 "Detailed Initialization Procedure" for the locking protocol
4462 // Are we already initialized and therefore done?
4463 // Note: we differ from the JLS here as we don't do this under the lock, this is benign as
4464 // an initialized class will never change its state.
4465 if (klass->IsInitialized()) {
4469 // Fast fail if initialization requires a full runtime. Not part of the JLS.
4470 if (!CanWeInitializeClass(klass.Get(), can_init_statics, can_init_parents)) {
4474 self->AllowThreadSuspension();
4477 ObjectLock<mirror::Class> lock(self, klass);
4479 // Re-check under the lock in case another thread initialized ahead of us.
4480 if (klass->IsInitialized()) {
4484 // Was the class already found to be erroneous? Done under the lock to match the JLS.
4485 if (klass->IsErroneous()) {
4486 ThrowEarlierClassFailure(klass.Get(), true);
4487 VlogClassInitializationFailure(klass);
4491 CHECK(klass->IsResolved()) << PrettyClass(klass.Get()) << ": state=" << klass->GetStatus();
4493 if (!klass->IsVerified()) {
4494 VerifyClass(self, klass);
4495 if (!klass->IsVerified()) {
4496 // We failed to verify, expect either the klass to be erroneous or verification failed at
4498 if (klass->IsErroneous()) {
4499 // The class is erroneous. This may be a verifier error, or another thread attempted
4500 // verification and/or initialization and failed. We can distinguish those cases by
4501 // whether an exception is already pending.
4502 if (self->IsExceptionPending()) {
4503 // Check that it's a VerifyError.
4504 DCHECK_EQ("java.lang.Class<java.lang.VerifyError>",
4505 PrettyClass(self->GetException()->GetClass()));
4507 // Check that another thread attempted initialization.
4508 DCHECK_NE(0, klass->GetClinitThreadId());
4509 DCHECK_NE(self->GetTid(), klass->GetClinitThreadId());
4510 // Need to rethrow the previous failure now.
4511 ThrowEarlierClassFailure(klass.Get(), true);
4513 VlogClassInitializationFailure(klass);
4515 CHECK(Runtime::Current()->IsAotCompiler());
4516 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime);
4520 self->AssertNoPendingException();
4523 // A separate thread could have moved us all the way to initialized. A "simple" example
4524 // involves a subclass of the current class being initialized at the same time (which
4525 // will implicitly initialize the superclass, if scheduled that way). b/28254258
4526 DCHECK_NE(mirror::Class::kStatusError, klass->GetStatus());
4527 if (klass->IsInitialized()) {
4532 // If the class is kStatusInitializing, either this thread is
4533 // initializing higher up the stack or another thread has beat us
4534 // to initializing and we need to wait. Either way, this
4535 // invocation of InitializeClass will not be responsible for
4536 // running <clinit> and will return.
4537 if (klass->GetStatus() == mirror::Class::kStatusInitializing) {
4538 // Could have got an exception during verification.
4539 if (self->IsExceptionPending()) {
4540 VlogClassInitializationFailure(klass);
4543 // We caught somebody else in the act; was it us?
4544 if (klass->GetClinitThreadId() == self->GetTid()) {
4545 // Yes. That's fine. Return so we can continue initializing.
4548 // No. That's fine. Wait for another thread to finish initializing.
4549 return WaitForInitializeClass(klass, self, lock);
4552 if (!ValidateSuperClassDescriptors(klass)) {
4553 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
4556 self->AllowThreadSuspension();
4558 CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusVerified) << PrettyClass(klass.Get())
4559 << " self.tid=" << self->GetTid() << " clinit.tid=" << klass->GetClinitThreadId();
4561 // From here out other threads may observe that we're initializing and so changes of state
4562 // require the a notification.
4563 klass->SetClinitThreadId(self->GetTid());
4564 mirror::Class::SetStatus(klass, mirror::Class::kStatusInitializing, self);
4569 // Initialize super classes, must be done while initializing for the JLS.
4570 if (!klass->IsInterface() && klass->HasSuperClass()) {
4571 mirror::Class* super_class = klass->GetSuperClass();
4572 if (!super_class->IsInitialized()) {
4573 CHECK(!super_class->IsInterface());
4574 CHECK(can_init_parents);
4575 StackHandleScope<1> hs(self);
4576 Handle<mirror::Class> handle_scope_super(hs.NewHandle(super_class));
4577 bool super_initialized = InitializeClass(self, handle_scope_super, can_init_statics, true);
4578 if (!super_initialized) {
4579 // The super class was verified ahead of entering initializing, we should only be here if
4580 // the super class became erroneous due to initialization.
4581 CHECK(handle_scope_super->IsErroneous() && self->IsExceptionPending())
4582 << "Super class initialization failed for "
4583 << PrettyDescriptor(handle_scope_super.Get())
4584 << " that has unexpected status " << handle_scope_super->GetStatus()
4585 << "\nPending exception:\n"
4586 << (self->GetException() != nullptr ? self->GetException()->Dump() : "");
4587 ObjectLock<mirror::Class> lock(self, klass);
4588 // Initialization failed because the super-class is erroneous.
4589 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
4595 if (!klass->IsInterface()) {
4596 // Initialize interfaces with default methods for the JLS.
4597 size_t num_direct_interfaces = klass->NumDirectInterfaces();
4598 // Only setup the (expensive) handle scope if we actually need to.
4599 if (UNLIKELY(num_direct_interfaces > 0)) {
4600 StackHandleScope<1> hs_iface(self);
4601 MutableHandle<mirror::Class> handle_scope_iface(hs_iface.NewHandle<mirror::Class>(nullptr));
4602 for (size_t i = 0; i < num_direct_interfaces; i++) {
4603 handle_scope_iface.Assign(mirror::Class::GetDirectInterface(self, klass, i));
4604 CHECK(handle_scope_iface.Get() != nullptr);
4605 CHECK(handle_scope_iface->IsInterface());
4606 if (handle_scope_iface->HasBeenRecursivelyInitialized()) {
4607 // We have already done this for this interface. Skip it.
4610 // We cannot just call initialize class directly because we need to ensure that ALL
4611 // interfaces with default methods are initialized. Non-default interface initialization
4612 // will not affect other non-default super-interfaces.
4613 bool iface_initialized = InitializeDefaultInterfaceRecursive(self,
4617 if (!iface_initialized) {
4618 ObjectLock<mirror::Class> lock(self, klass);
4619 // Initialization failed because one of our interfaces with default methods is erroneous.
4620 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
4627 const size_t num_static_fields = klass->NumStaticFields();
4628 if (num_static_fields > 0) {
4629 const DexFile::ClassDef* dex_class_def = klass->GetClassDef();
4630 CHECK(dex_class_def != nullptr);
4631 const DexFile& dex_file = klass->GetDexFile();
4632 StackHandleScope<3> hs(self);
4633 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(klass->GetClassLoader()));
4634 Handle<mirror::DexCache> dex_cache(hs.NewHandle(klass->GetDexCache()));
4636 // Eagerly fill in static fields so that the we don't have to do as many expensive
4637 // Class::FindStaticField in ResolveField.
4638 for (size_t i = 0; i < num_static_fields; ++i) {
4639 ArtField* field = klass->GetStaticField(i);
4640 const uint32_t field_idx = field->GetDexFieldIndex();
4641 ArtField* resolved_field = dex_cache->GetResolvedField(field_idx, image_pointer_size_);
4642 if (resolved_field == nullptr) {
4643 dex_cache->SetResolvedField(field_idx, field, image_pointer_size_);
4645 DCHECK_EQ(field, resolved_field);
4649 EncodedStaticFieldValueIterator value_it(dex_file, &dex_cache, &class_loader,
4650 this, *dex_class_def);
4651 const uint8_t* class_data = dex_file.GetClassData(*dex_class_def);
4652 ClassDataItemIterator field_it(dex_file, class_data);
4653 if (value_it.HasNext()) {
4654 DCHECK(field_it.HasNextStaticField());
4655 CHECK(can_init_statics);
4656 for ( ; value_it.HasNext(); value_it.Next(), field_it.Next()) {
4657 ArtField* field = ResolveField(
4658 dex_file, field_it.GetMemberIndex(), dex_cache, class_loader, true);
4659 if (Runtime::Current()->IsActiveTransaction()) {
4660 value_it.ReadValueToField<true>(field);
4662 value_it.ReadValueToField<false>(field);
4664 if (self->IsExceptionPending()) {
4667 DCHECK(!value_it.HasNext() || field_it.HasNextStaticField());
4673 if (!self->IsExceptionPending()) {
4674 ArtMethod* clinit = klass->FindClassInitializer(image_pointer_size_);
4675 if (clinit != nullptr) {
4676 CHECK(can_init_statics);
4678 clinit->Invoke(self, nullptr, 0, &result, "V");
4681 self->AllowThreadSuspension();
4682 uint64_t t1 = NanoTime();
4684 bool success = true;
4686 ObjectLock<mirror::Class> lock(self, klass);
4688 if (self->IsExceptionPending()) {
4689 WrapExceptionInInitializer(klass);
4690 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
4692 } else if (Runtime::Current()->IsTransactionAborted()) {
4693 // The exception thrown when the transaction aborted has been caught and cleared
4694 // so we need to throw it again now.
4695 VLOG(compiler) << "Return from class initializer of " << PrettyDescriptor(klass.Get())
4696 << " without exception while transaction was aborted: re-throw it now.";
4697 Runtime::Current()->ThrowTransactionAbortError(self);
4698 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
4701 RuntimeStats* global_stats = Runtime::Current()->GetStats();
4702 RuntimeStats* thread_stats = self->GetStats();
4703 ++global_stats->class_init_count;
4704 ++thread_stats->class_init_count;
4705 global_stats->class_init_time_ns += (t1 - t0);
4706 thread_stats->class_init_time_ns += (t1 - t0);
4707 // Set the class as initialized except if failed to initialize static fields.
4708 mirror::Class::SetStatus(klass, mirror::Class::kStatusInitialized, self);
4709 if (VLOG_IS_ON(class_linker)) {
4711 LOG(INFO) << "Initialized class " << klass->GetDescriptor(&temp) << " from " <<
4712 klass->GetLocation();
4714 // Opportunistically set static method trampolines to their destination.
4715 FixupStaticTrampolines(klass.Get());
4721 // We recursively run down the tree of interfaces. We need to do this in the order they are declared
4722 // and perform the initialization only on those interfaces that contain default methods.
4723 bool ClassLinker::InitializeDefaultInterfaceRecursive(Thread* self,
4724 Handle<mirror::Class> iface,
4725 bool can_init_statics,
4726 bool can_init_parents) {
4727 CHECK(iface->IsInterface());
4728 size_t num_direct_ifaces = iface->NumDirectInterfaces();
4729 // Only create the (expensive) handle scope if we need it.
4730 if (UNLIKELY(num_direct_ifaces > 0)) {
4731 StackHandleScope<1> hs(self);
4732 MutableHandle<mirror::Class> handle_super_iface(hs.NewHandle<mirror::Class>(nullptr));
4733 // First we initialize all of iface's super-interfaces recursively.
4734 for (size_t i = 0; i < num_direct_ifaces; i++) {
4735 mirror::Class* super_iface = mirror::Class::GetDirectInterface(self, iface, i);
4736 if (!super_iface->HasBeenRecursivelyInitialized()) {
4738 handle_super_iface.Assign(super_iface);
4739 if (!InitializeDefaultInterfaceRecursive(self,
4742 can_init_parents)) {
4750 // Then we initialize 'iface' if it has default methods. We do not need to (and in fact must not)
4751 // initialize if we don't have default methods.
4752 if (iface->HasDefaultMethods()) {
4753 result = EnsureInitialized(self, iface, can_init_statics, can_init_parents);
4756 // Mark that this interface has undergone recursive default interface initialization so we know we
4757 // can skip it on any later class initializations. We do this even if we are not a default
4758 // interface since we can still avoid the traversal. This is purely a performance optimization.
4760 // TODO This should be done in a better way
4761 ObjectLock<mirror::Class> lock(self, iface);
4762 iface->SetRecursivelyInitialized();
4767 bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass,
4769 ObjectLock<mirror::Class>& lock)
4770 SHARED_REQUIRES(Locks::mutator_lock_) {
4772 self->AssertNoPendingException();
4773 CHECK(!klass->IsInitialized());
4774 lock.WaitIgnoringInterrupts();
4776 // When we wake up, repeat the test for init-in-progress. If
4777 // there's an exception pending (only possible if
4778 // we were not using WaitIgnoringInterrupts), bail out.
4779 if (self->IsExceptionPending()) {
4780 WrapExceptionInInitializer(klass);
4781 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
4784 // Spurious wakeup? Go back to waiting.
4785 if (klass->GetStatus() == mirror::Class::kStatusInitializing) {
4788 if (klass->GetStatus() == mirror::Class::kStatusVerified &&
4789 Runtime::Current()->IsAotCompiler()) {
4790 // Compile time initialization failed.
4793 if (klass->IsErroneous()) {
4794 // The caller wants an exception, but it was thrown in a
4795 // different thread. Synthesize one here.
4796 ThrowNoClassDefFoundError("<clinit> failed for class %s; see exception in other thread",
4797 PrettyDescriptor(klass.Get()).c_str());
4798 VlogClassInitializationFailure(klass);
4801 if (klass->IsInitialized()) {
4804 LOG(FATAL) << "Unexpected class status. " << PrettyClass(klass.Get()) << " is "
4805 << klass->GetStatus();
4810 static void ThrowSignatureCheckResolveReturnTypeException(Handle<mirror::Class> klass,
4811 Handle<mirror::Class> super_klass,
4814 SHARED_REQUIRES(Locks::mutator_lock_) {
4815 DCHECK(Thread::Current()->IsExceptionPending());
4816 DCHECK(!m->IsProxyMethod());
4817 const DexFile* dex_file = m->GetDexFile();
4818 const DexFile::MethodId& method_id = dex_file->GetMethodId(m->GetDexMethodIndex());
4819 const DexFile::ProtoId& proto_id = dex_file->GetMethodPrototype(method_id);
4820 uint16_t return_type_idx = proto_id.return_type_idx_;
4821 std::string return_type = PrettyType(return_type_idx, *dex_file);
4822 std::string class_loader = PrettyTypeOf(m->GetDeclaringClass()->GetClassLoader());
4823 ThrowWrappedLinkageError(klass.Get(),
4824 "While checking class %s method %s signature against %s %s: "
4825 "Failed to resolve return type %s with %s",
4826 PrettyDescriptor(klass.Get()).c_str(),
4827 PrettyMethod(method).c_str(),
4828 super_klass->IsInterface() ? "interface" : "superclass",
4829 PrettyDescriptor(super_klass.Get()).c_str(),
4830 return_type.c_str(), class_loader.c_str());
4833 static void ThrowSignatureCheckResolveArgException(Handle<mirror::Class> klass,
4834 Handle<mirror::Class> super_klass,
4838 uint32_t arg_type_idx)
4839 SHARED_REQUIRES(Locks::mutator_lock_) {
4840 DCHECK(Thread::Current()->IsExceptionPending());
4841 DCHECK(!m->IsProxyMethod());
4842 const DexFile* dex_file = m->GetDexFile();
4843 std::string arg_type = PrettyType(arg_type_idx, *dex_file);
4844 std::string class_loader = PrettyTypeOf(m->GetDeclaringClass()->GetClassLoader());
4845 ThrowWrappedLinkageError(klass.Get(),
4846 "While checking class %s method %s signature against %s %s: "
4847 "Failed to resolve arg %u type %s with %s",
4848 PrettyDescriptor(klass.Get()).c_str(),
4849 PrettyMethod(method).c_str(),
4850 super_klass->IsInterface() ? "interface" : "superclass",
4851 PrettyDescriptor(super_klass.Get()).c_str(),
4852 index, arg_type.c_str(), class_loader.c_str());
4855 static void ThrowSignatureMismatch(Handle<mirror::Class> klass,
4856 Handle<mirror::Class> super_klass,
4858 const std::string& error_msg)
4859 SHARED_REQUIRES(Locks::mutator_lock_) {
4860 ThrowLinkageError(klass.Get(),
4861 "Class %s method %s resolves differently in %s %s: %s",
4862 PrettyDescriptor(klass.Get()).c_str(),
4863 PrettyMethod(method).c_str(),
4864 super_klass->IsInterface() ? "interface" : "superclass",
4865 PrettyDescriptor(super_klass.Get()).c_str(),
4869 static bool HasSameSignatureWithDifferentClassLoaders(Thread* self,
4870 size_t pointer_size,
4871 Handle<mirror::Class> klass,
4872 Handle<mirror::Class> super_klass,
4875 SHARED_REQUIRES(Locks::mutator_lock_) {
4877 StackHandleScope<1> hs(self);
4878 Handle<mirror::Class> return_type(hs.NewHandle(method1->GetReturnType(true /* resolve */,
4880 if (UNLIKELY(return_type.Get() == nullptr)) {
4881 ThrowSignatureCheckResolveReturnTypeException(klass, super_klass, method1, method1);
4884 mirror::Class* other_return_type = method2->GetReturnType(true /* resolve */,
4886 if (UNLIKELY(other_return_type == nullptr)) {
4887 ThrowSignatureCheckResolveReturnTypeException(klass, super_klass, method1, method2);
4890 if (UNLIKELY(other_return_type != return_type.Get())) {
4891 ThrowSignatureMismatch(klass, super_klass, method1,
4892 StringPrintf("Return types mismatch: %s(%p) vs %s(%p)",
4893 PrettyClassAndClassLoader(return_type.Get()).c_str(),
4895 PrettyClassAndClassLoader(other_return_type).c_str(),
4896 other_return_type));
4900 const DexFile::TypeList* types1 = method1->GetParameterTypeList();
4901 const DexFile::TypeList* types2 = method2->GetParameterTypeList();
4902 if (types1 == nullptr) {
4903 if (types2 != nullptr && types2->Size() != 0) {
4904 ThrowSignatureMismatch(klass, super_klass, method1,
4905 StringPrintf("Type list mismatch with %s",
4906 PrettyMethod(method2, true).c_str()));
4910 } else if (UNLIKELY(types2 == nullptr)) {
4911 if (types1->Size() != 0) {
4912 ThrowSignatureMismatch(klass, super_klass, method1,
4913 StringPrintf("Type list mismatch with %s",
4914 PrettyMethod(method2, true).c_str()));
4919 uint32_t num_types = types1->Size();
4920 if (UNLIKELY(num_types != types2->Size())) {
4921 ThrowSignatureMismatch(klass, super_klass, method1,
4922 StringPrintf("Type list mismatch with %s",
4923 PrettyMethod(method2, true).c_str()));
4926 for (uint32_t i = 0; i < num_types; ++i) {
4927 StackHandleScope<1> hs(self);
4928 uint32_t param_type_idx = types1->GetTypeItem(i).type_idx_;
4929 Handle<mirror::Class> param_type(hs.NewHandle(
4930 method1->GetClassFromTypeIndex(param_type_idx, true /* resolve */, pointer_size)));
4931 if (UNLIKELY(param_type.Get() == nullptr)) {
4932 ThrowSignatureCheckResolveArgException(klass, super_klass, method1,
4933 method1, i, param_type_idx);
4936 uint32_t other_param_type_idx = types2->GetTypeItem(i).type_idx_;
4937 mirror::Class* other_param_type =
4938 method2->GetClassFromTypeIndex(other_param_type_idx, true /* resolve */, pointer_size);
4939 if (UNLIKELY(other_param_type == nullptr)) {
4940 ThrowSignatureCheckResolveArgException(klass, super_klass, method1,
4941 method2, i, other_param_type_idx);
4944 if (UNLIKELY(param_type.Get() != other_param_type)) {
4945 ThrowSignatureMismatch(klass, super_klass, method1,
4946 StringPrintf("Parameter %u type mismatch: %s(%p) vs %s(%p)",
4948 PrettyClassAndClassLoader(param_type.Get()).c_str(),
4950 PrettyClassAndClassLoader(other_param_type).c_str(),
4959 bool ClassLinker::ValidateSuperClassDescriptors(Handle<mirror::Class> klass) {
4960 if (klass->IsInterface()) {
4963 // Begin with the methods local to the superclass.
4964 Thread* self = Thread::Current();
4965 StackHandleScope<1> hs(self);
4966 MutableHandle<mirror::Class> super_klass(hs.NewHandle<mirror::Class>(nullptr));
4967 if (klass->HasSuperClass() &&
4968 klass->GetClassLoader() != klass->GetSuperClass()->GetClassLoader()) {
4969 super_klass.Assign(klass->GetSuperClass());
4970 for (int i = klass->GetSuperClass()->GetVTableLength() - 1; i >= 0; --i) {
4971 auto* m = klass->GetVTableEntry(i, image_pointer_size_);
4972 auto* super_m = klass->GetSuperClass()->GetVTableEntry(i, image_pointer_size_);
4974 if (UNLIKELY(!HasSameSignatureWithDifferentClassLoaders(self, image_pointer_size_,
4977 self->AssertPendingException();
4983 for (int32_t i = 0; i < klass->GetIfTableCount(); ++i) {
4984 super_klass.Assign(klass->GetIfTable()->GetInterface(i));
4985 if (klass->GetClassLoader() != super_klass->GetClassLoader()) {
4986 uint32_t num_methods = super_klass->NumVirtualMethods();
4987 for (uint32_t j = 0; j < num_methods; ++j) {
4988 auto* m = klass->GetIfTable()->GetMethodArray(i)->GetElementPtrSize<ArtMethod*>(
4989 j, image_pointer_size_);
4990 auto* super_m = super_klass->GetVirtualMethod(j, image_pointer_size_);
4992 if (UNLIKELY(!HasSameSignatureWithDifferentClassLoaders(self, image_pointer_size_,
4995 self->AssertPendingException();
5005 bool ClassLinker::EnsureInitialized(Thread* self, Handle<mirror::Class> c, bool can_init_fields,
5006 bool can_init_parents) {
5007 DCHECK(c.Get() != nullptr);
5008 if (c->IsInitialized()) {
5009 EnsureSkipAccessChecksMethods(c);
5012 const bool success = InitializeClass(self, c, can_init_fields, can_init_parents);
5014 if (can_init_fields && can_init_parents) {
5015 CHECK(self->IsExceptionPending()) << PrettyClass(c.Get());
5018 self->AssertNoPendingException();
5023 void ClassLinker::FixupTemporaryDeclaringClass(mirror::Class* temp_class,
5024 mirror::Class* new_class) {
5025 DCHECK_EQ(temp_class->NumInstanceFields(), 0u);
5026 for (ArtField& field : new_class->GetIFields()) {
5027 if (field.GetDeclaringClass() == temp_class) {
5028 field.SetDeclaringClass(new_class);
5032 DCHECK_EQ(temp_class->NumStaticFields(), 0u);
5033 for (ArtField& field : new_class->GetSFields()) {
5034 if (field.GetDeclaringClass() == temp_class) {
5035 field.SetDeclaringClass(new_class);
5039 DCHECK_EQ(temp_class->NumDirectMethods(), 0u);
5040 DCHECK_EQ(temp_class->NumVirtualMethods(), 0u);
5041 for (auto& method : new_class->GetMethods(image_pointer_size_)) {
5042 if (method.GetDeclaringClass() == temp_class) {
5043 method.SetDeclaringClass(new_class);
5047 // Make sure the remembered set and mod-union tables know that we updated some of the native
5049 Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(new_class);
5052 void ClassLinker::RegisterClassLoader(mirror::ClassLoader* class_loader) {
5053 CHECK(class_loader->GetAllocator() == nullptr);
5054 CHECK(class_loader->GetClassTable() == nullptr);
5055 Thread* const self = Thread::Current();
5056 ClassLoaderData data;
5057 data.weak_root = self->GetJniEnv()->vm->AddWeakGlobalRef(self, class_loader);
5058 // Create and set the class table.
5059 data.class_table = new ClassTable;
5060 class_loader->SetClassTable(data.class_table);
5061 // Create and set the linear allocator.
5062 data.allocator = Runtime::Current()->CreateLinearAlloc();
5063 class_loader->SetAllocator(data.allocator);
5064 // Add to the list so that we know to free the data later.
5065 class_loaders_.push_back(data);
5068 ClassTable* ClassLinker::InsertClassTableForClassLoader(mirror::ClassLoader* class_loader) {
5069 if (class_loader == nullptr) {
5070 return &boot_class_table_;
5072 ClassTable* class_table = class_loader->GetClassTable();
5073 if (class_table == nullptr) {
5074 RegisterClassLoader(class_loader);
5075 class_table = class_loader->GetClassTable();
5076 DCHECK(class_table != nullptr);
5081 ClassTable* ClassLinker::ClassTableForClassLoader(mirror::ClassLoader* class_loader) {
5082 return class_loader == nullptr ? &boot_class_table_ : class_loader->GetClassTable();
5085 static ImTable* FindSuperImt(mirror::Class* klass, size_t pointer_size)
5086 SHARED_REQUIRES(Locks::mutator_lock_) {
5087 while (klass->HasSuperClass()) {
5088 klass = klass->GetSuperClass();
5089 if (klass->ShouldHaveImt()) {
5090 return klass->GetImt(pointer_size);
5096 bool ClassLinker::LinkClass(Thread* self,
5097 const char* descriptor,
5098 Handle<mirror::Class> klass,
5099 Handle<mirror::ObjectArray<mirror::Class>> interfaces,
5100 MutableHandle<mirror::Class>* h_new_class_out) {
5101 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus());
5103 if (!LinkSuperClass(klass)) {
5106 ArtMethod* imt_data[ImTable::kSize];
5107 // If there are any new conflicts compared to super class.
5108 bool new_conflict = false;
5109 std::fill_n(imt_data, arraysize(imt_data), Runtime::Current()->GetImtUnimplementedMethod());
5110 if (!LinkMethods(self, klass, interfaces, &new_conflict, imt_data)) {
5113 if (!LinkInstanceFields(self, klass)) {
5117 if (!LinkStaticFields(self, klass, &class_size)) {
5120 CreateReferenceInstanceOffsets(klass);
5121 CHECK_EQ(mirror::Class::kStatusLoaded, klass->GetStatus());
5123 ImTable* imt = nullptr;
5124 if (klass->ShouldHaveImt()) {
5125 // If there are any new conflicts compared to the super class we can not make a copy. There
5126 // can be cases where both will have a conflict method at the same slot without having the same
5127 // set of conflicts. In this case, we can not share the IMT since the conflict table slow path
5128 // will possibly create a table that is incorrect for either of the classes.
5129 // Same IMT with new_conflict does not happen very often.
5130 if (!new_conflict) {
5131 ImTable* super_imt = FindSuperImt(klass.Get(), image_pointer_size_);
5132 if (super_imt != nullptr) {
5133 bool imt_equals = true;
5134 for (size_t i = 0; i < ImTable::kSize && imt_equals; ++i) {
5135 imt_equals = imt_equals && (super_imt->Get(i, image_pointer_size_) == imt_data[i]);
5142 if (imt == nullptr) {
5143 LinearAlloc* allocator = GetAllocatorForClassLoader(klass->GetClassLoader());
5144 imt = reinterpret_cast<ImTable*>(
5145 allocator->Alloc(self, ImTable::SizeInBytes(image_pointer_size_)));
5146 if (imt == nullptr) {
5149 imt->Populate(imt_data, image_pointer_size_);
5153 if (!klass->IsTemp() || (!init_done_ && klass->GetClassSize() == class_size)) {
5154 // We don't need to retire this class as it has no embedded tables or it was created the
5155 // correct size during class linker initialization.
5156 CHECK_EQ(klass->GetClassSize(), class_size) << PrettyDescriptor(klass.Get());
5158 if (klass->ShouldHaveEmbeddedVTable()) {
5159 klass->PopulateEmbeddedVTable(image_pointer_size_);
5161 if (klass->ShouldHaveImt()) {
5162 klass->SetImt(imt, image_pointer_size_);
5164 // This will notify waiters on klass that saw the not yet resolved
5165 // class in the class_table_ during EnsureResolved.
5166 mirror::Class::SetStatus(klass, mirror::Class::kStatusResolved, self);
5167 h_new_class_out->Assign(klass.Get());
5169 CHECK(!klass->IsResolved());
5170 // Retire the temporary class and create the correctly sized resolved class.
5171 StackHandleScope<1> hs(self);
5172 auto h_new_class = hs.NewHandle(klass->CopyOf(self, class_size, imt, image_pointer_size_));
5173 // Set arrays to null since we don't want to have multiple classes with the same ArtField or
5174 // ArtMethod array pointers. If this occurs, it causes bugs in remembered sets since the GC
5175 // may not see any references to the target space and clean the card for a class if another
5176 // class had the same array pointer.
5177 klass->SetMethodsPtrUnchecked(nullptr, 0, 0);
5178 klass->SetSFieldsPtrUnchecked(nullptr);
5179 klass->SetIFieldsPtrUnchecked(nullptr);
5180 if (UNLIKELY(h_new_class.Get() == nullptr)) {
5181 self->AssertPendingOOMException();
5182 mirror::Class::SetStatus(klass, mirror::Class::kStatusError, self);
5186 CHECK_EQ(h_new_class->GetClassSize(), class_size);
5187 ObjectLock<mirror::Class> lock(self, h_new_class);
5188 FixupTemporaryDeclaringClass(klass.Get(), h_new_class.Get());
5191 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
5192 mirror::ClassLoader* const class_loader = h_new_class.Get()->GetClassLoader();
5193 ClassTable* const table = InsertClassTableForClassLoader(class_loader);
5194 mirror::Class* existing = table->UpdateClass(descriptor, h_new_class.Get(),
5195 ComputeModifiedUtf8Hash(descriptor));
5196 if (class_loader != nullptr) {
5197 // We updated the class in the class table, perform the write barrier so that the GC knows
5198 // about the change.
5199 Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(class_loader);
5201 CHECK_EQ(existing, klass.Get());
5202 if (kIsDebugBuild && class_loader == nullptr && dex_cache_boot_image_class_lookup_required_) {
5203 // Check a class loaded with the system class loader matches one in the image if the class
5205 mirror::Class* const image_class = LookupClassFromBootImage(descriptor);
5206 if (image_class != nullptr) {
5207 CHECK_EQ(klass.Get(), existing) << descriptor;
5210 if (log_new_class_table_roots_) {
5211 new_class_roots_.push_back(GcRoot<mirror::Class>(h_new_class.Get()));
5215 // This will notify waiters on temp class that saw the not yet resolved class in the
5216 // class_table_ during EnsureResolved.
5217 mirror::Class::SetStatus(klass, mirror::Class::kStatusRetired, self);
5219 CHECK_EQ(h_new_class->GetStatus(), mirror::Class::kStatusResolving);
5220 // This will notify waiters on new_class that saw the not yet resolved
5221 // class in the class_table_ during EnsureResolved.
5222 mirror::Class::SetStatus(h_new_class, mirror::Class::kStatusResolved, self);
5223 // Return the new class.
5224 h_new_class_out->Assign(h_new_class.Get());
5229 static void CountMethodsAndFields(ClassDataItemIterator& dex_data,
5230 size_t* virtual_methods,
5231 size_t* direct_methods,
5232 size_t* static_fields,
5233 size_t* instance_fields) {
5234 *virtual_methods = *direct_methods = *static_fields = *instance_fields = 0;
5236 while (dex_data.HasNextStaticField()) {
5240 while (dex_data.HasNextInstanceField()) {
5242 (*instance_fields)++;
5244 while (dex_data.HasNextDirectMethod()) {
5245 (*direct_methods)++;
5248 while (dex_data.HasNextVirtualMethod()) {
5249 (*virtual_methods)++;
5252 DCHECK(!dex_data.HasNext());
5255 static void DumpClass(std::ostream& os,
5256 const DexFile& dex_file, const DexFile::ClassDef& dex_class_def,
5257 const char* suffix) {
5258 ClassDataItemIterator dex_data(dex_file, dex_file.GetClassData(dex_class_def));
5259 os << dex_file.GetClassDescriptor(dex_class_def) << suffix << ":\n";
5260 os << " Static fields:\n";
5261 while (dex_data.HasNextStaticField()) {
5262 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex());
5263 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n";
5266 os << " Instance fields:\n";
5267 while (dex_data.HasNextInstanceField()) {
5268 const DexFile::FieldId& id = dex_file.GetFieldId(dex_data.GetMemberIndex());
5269 os << " " << dex_file.GetFieldTypeDescriptor(id) << " " << dex_file.GetFieldName(id) << "\n";
5272 os << " Direct methods:\n";
5273 while (dex_data.HasNextDirectMethod()) {
5274 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex());
5275 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n";
5278 os << " Virtual methods:\n";
5279 while (dex_data.HasNextVirtualMethod()) {
5280 const DexFile::MethodId& id = dex_file.GetMethodId(dex_data.GetMemberIndex());
5281 os << " " << dex_file.GetMethodName(id) << dex_file.GetMethodSignature(id).ToString() << "\n";
5286 static std::string DumpClasses(const DexFile& dex_file1,
5287 const DexFile::ClassDef& dex_class_def1,
5288 const DexFile& dex_file2,
5289 const DexFile::ClassDef& dex_class_def2) {
5290 std::ostringstream os;
5291 DumpClass(os, dex_file1, dex_class_def1, " (Compile time)");
5292 DumpClass(os, dex_file2, dex_class_def2, " (Runtime)");
5297 // Very simple structural check on whether the classes match. Only compares the number of
5298 // methods and fields.
5299 static bool SimpleStructuralCheck(const DexFile& dex_file1,
5300 const DexFile::ClassDef& dex_class_def1,
5301 const DexFile& dex_file2,
5302 const DexFile::ClassDef& dex_class_def2,
5303 std::string* error_msg) {
5304 ClassDataItemIterator dex_data1(dex_file1, dex_file1.GetClassData(dex_class_def1));
5305 ClassDataItemIterator dex_data2(dex_file2, dex_file2.GetClassData(dex_class_def2));
5307 // Counters for current dex file.
5308 size_t dex_virtual_methods1, dex_direct_methods1, dex_static_fields1, dex_instance_fields1;
5309 CountMethodsAndFields(dex_data1,
5310 &dex_virtual_methods1,
5311 &dex_direct_methods1,
5312 &dex_static_fields1,
5313 &dex_instance_fields1);
5314 // Counters for compile-time dex file.
5315 size_t dex_virtual_methods2, dex_direct_methods2, dex_static_fields2, dex_instance_fields2;
5316 CountMethodsAndFields(dex_data2,
5317 &dex_virtual_methods2,
5318 &dex_direct_methods2,
5319 &dex_static_fields2,
5320 &dex_instance_fields2);
5322 if (dex_virtual_methods1 != dex_virtual_methods2) {
5323 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2);
5324 *error_msg = StringPrintf("Virtual method count off: %zu vs %zu\n%s",
5325 dex_virtual_methods1,
5326 dex_virtual_methods2,
5327 class_dump.c_str());
5330 if (dex_direct_methods1 != dex_direct_methods2) {
5331 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2);
5332 *error_msg = StringPrintf("Direct method count off: %zu vs %zu\n%s",
5333 dex_direct_methods1,
5334 dex_direct_methods2,
5335 class_dump.c_str());
5338 if (dex_static_fields1 != dex_static_fields2) {
5339 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2);
5340 *error_msg = StringPrintf("Static field count off: %zu vs %zu\n%s",
5343 class_dump.c_str());
5346 if (dex_instance_fields1 != dex_instance_fields2) {
5347 std::string class_dump = DumpClasses(dex_file1, dex_class_def1, dex_file2, dex_class_def2);
5348 *error_msg = StringPrintf("Instance field count off: %zu vs %zu\n%s",
5349 dex_instance_fields1,
5350 dex_instance_fields2,
5351 class_dump.c_str());
5358 // Checks whether a the super-class changed from what we had at compile-time. This would
5359 // invalidate quickening.
5360 static bool CheckSuperClassChange(Handle<mirror::Class> klass,
5361 const DexFile& dex_file,
5362 const DexFile::ClassDef& class_def,
5363 mirror::Class* super_class)
5364 SHARED_REQUIRES(Locks::mutator_lock_) {
5365 // Check for unexpected changes in the superclass.
5366 // Quick check 1) is the super_class class-loader the boot class loader? This always has
5368 if (super_class->GetClassLoader() != nullptr &&
5369 // Quick check 2) different dex cache? Breaks can only occur for different dex files,
5370 // which is implied by different dex cache.
5371 klass->GetDexCache() != super_class->GetDexCache()) {
5372 // Now comes the expensive part: things can be broken if (a) the klass' dex file has a
5373 // definition for the super-class, and (b) the files are in separate oat files. The oat files
5374 // are referenced from the dex file, so do (b) first. Only relevant if we have oat files.
5375 const OatDexFile* class_oat_dex_file = dex_file.GetOatDexFile();
5376 const OatFile* class_oat_file = nullptr;
5377 if (class_oat_dex_file != nullptr) {
5378 class_oat_file = class_oat_dex_file->GetOatFile();
5381 if (class_oat_file != nullptr) {
5382 const OatDexFile* loaded_super_oat_dex_file = super_class->GetDexFile().GetOatDexFile();
5383 const OatFile* loaded_super_oat_file = nullptr;
5384 if (loaded_super_oat_dex_file != nullptr) {
5385 loaded_super_oat_file = loaded_super_oat_dex_file->GetOatFile();
5388 if (loaded_super_oat_file != nullptr && class_oat_file != loaded_super_oat_file) {
5390 const DexFile::ClassDef* super_class_def = dex_file.FindClassDef(class_def.superclass_idx_);
5391 if (super_class_def != nullptr) {
5392 // Uh-oh, we found something. Do our check.
5393 std::string error_msg;
5394 if (!SimpleStructuralCheck(dex_file, *super_class_def,
5395 super_class->GetDexFile(), *super_class->GetClassDef(),
5397 // Print a warning to the log. This exception might be caught, e.g., as common in test
5398 // drivers. When the class is later tried to be used, we re-throw a new instance, as we
5399 // only save the type of the exception.
5400 LOG(WARNING) << "Incompatible structural change detected: " <<
5402 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s",
5403 PrettyType(super_class_def->class_idx_, dex_file).c_str(),
5404 class_oat_file->GetLocation().c_str(),
5405 loaded_super_oat_file->GetLocation().c_str(),
5407 ThrowIncompatibleClassChangeError(klass.Get(),
5408 "Structural change of %s is hazardous (%s at compile time, %s at runtime): %s",
5409 PrettyType(super_class_def->class_idx_, dex_file).c_str(),
5410 class_oat_file->GetLocation().c_str(),
5411 loaded_super_oat_file->GetLocation().c_str(),
5422 bool ClassLinker::LoadSuperAndInterfaces(Handle<mirror::Class> klass, const DexFile& dex_file) {
5423 CHECK_EQ(mirror::Class::kStatusIdx, klass->GetStatus());
5424 const DexFile::ClassDef& class_def = dex_file.GetClassDef(klass->GetDexClassDefIndex());
5425 uint16_t super_class_idx = class_def.superclass_idx_;
5426 if (super_class_idx != DexFile::kDexNoIndex16) {
5427 // Check that a class does not inherit from itself directly.
5429 // TODO: This is a cheap check to detect the straightforward case
5430 // of a class extending itself (b/28685551), but we should do a
5431 // proper cycle detection on loaded classes, to detect all cases
5432 // of class circularity errors (b/28830038).
5433 if (super_class_idx == class_def.class_idx_) {
5434 ThrowClassCircularityError(klass.Get(),
5435 "Class %s extends itself",
5436 PrettyDescriptor(klass.Get()).c_str());
5440 mirror::Class* super_class = ResolveType(dex_file, super_class_idx, klass.Get());
5441 if (super_class == nullptr) {
5442 DCHECK(Thread::Current()->IsExceptionPending());
5446 if (!klass->CanAccess(super_class)) {
5447 ThrowIllegalAccessError(klass.Get(), "Class %s extended by class %s is inaccessible",
5448 PrettyDescriptor(super_class).c_str(),
5449 PrettyDescriptor(klass.Get()).c_str());
5452 CHECK(super_class->IsResolved());
5453 klass->SetSuperClass(super_class);
5455 if (!CheckSuperClassChange(klass, dex_file, class_def, super_class)) {
5456 DCHECK(Thread::Current()->IsExceptionPending());
5460 const DexFile::TypeList* interfaces = dex_file.GetInterfacesList(class_def);
5461 if (interfaces != nullptr) {
5462 for (size_t i = 0; i < interfaces->Size(); i++) {
5463 uint16_t idx = interfaces->GetTypeItem(i).type_idx_;
5464 mirror::Class* interface = ResolveType(dex_file, idx, klass.Get());
5465 if (interface == nullptr) {
5466 DCHECK(Thread::Current()->IsExceptionPending());
5470 if (!klass->CanAccess(interface)) {
5471 // TODO: the RI seemed to ignore this in my testing.
5472 ThrowIllegalAccessError(klass.Get(),
5473 "Interface %s implemented by class %s is inaccessible",
5474 PrettyDescriptor(interface).c_str(),
5475 PrettyDescriptor(klass.Get()).c_str());
5480 // Mark the class as loaded.
5481 mirror::Class::SetStatus(klass, mirror::Class::kStatusLoaded, nullptr);
5485 bool ClassLinker::LinkSuperClass(Handle<mirror::Class> klass) {
5486 CHECK(!klass->IsPrimitive());
5487 mirror::Class* super = klass->GetSuperClass();
5488 if (klass.Get() == GetClassRoot(kJavaLangObject)) {
5489 if (super != nullptr) {
5490 ThrowClassFormatError(klass.Get(), "java.lang.Object must not have a superclass");
5495 if (super == nullptr) {
5496 ThrowLinkageError(klass.Get(), "No superclass defined for class %s",
5497 PrettyDescriptor(klass.Get()).c_str());
5501 if (super->IsFinal() || super->IsInterface()) {
5502 ThrowIncompatibleClassChangeError(klass.Get(),
5503 "Superclass %s of %s is %s",
5504 PrettyDescriptor(super).c_str(),
5505 PrettyDescriptor(klass.Get()).c_str(),
5506 super->IsFinal() ? "declared final" : "an interface");
5509 if (!klass->CanAccess(super)) {
5510 ThrowIllegalAccessError(klass.Get(), "Superclass %s is inaccessible to class %s",
5511 PrettyDescriptor(super).c_str(),
5512 PrettyDescriptor(klass.Get()).c_str());
5516 // Inherit kAccClassIsFinalizable from the superclass in case this
5517 // class doesn't override finalize.
5518 if (super->IsFinalizable()) {
5519 klass->SetFinalizable();
5522 // Inherit class loader flag form super class.
5523 if (super->IsClassLoaderClass()) {
5524 klass->SetClassLoaderClass();
5527 // Inherit reference flags (if any) from the superclass.
5528 uint32_t reference_flags = (super->GetClassFlags() & mirror::kClassFlagReference);
5529 if (reference_flags != 0) {
5530 CHECK_EQ(klass->GetClassFlags(), 0u);
5531 klass->SetClassFlags(klass->GetClassFlags() | reference_flags);
5533 // Disallow custom direct subclasses of java.lang.ref.Reference.
5534 if (init_done_ && super == GetClassRoot(kJavaLangRefReference)) {
5535 ThrowLinkageError(klass.Get(),
5536 "Class %s attempts to subclass java.lang.ref.Reference, which is not allowed",
5537 PrettyDescriptor(klass.Get()).c_str());
5541 if (kIsDebugBuild) {
5542 // Ensure super classes are fully resolved prior to resolving fields..
5543 while (super != nullptr) {
5544 CHECK(super->IsResolved());
5545 super = super->GetSuperClass();
5551 // Populate the class vtable and itable. Compute return type indices.
5552 bool ClassLinker::LinkMethods(Thread* self,
5553 Handle<mirror::Class> klass,
5554 Handle<mirror::ObjectArray<mirror::Class>> interfaces,
5555 bool* out_new_conflict,
5556 ArtMethod** out_imt) {
5557 self->AllowThreadSuspension();
5558 // A map from vtable indexes to the method they need to be updated to point to. Used because we
5559 // need to have default methods be in the virtuals array of each class but we don't set that up
5560 // until LinkInterfaceMethods.
5561 std::unordered_map<size_t, ClassLinker::MethodTranslation> default_translations;
5562 // Link virtual methods then interface methods.
5563 // We set up the interface lookup table first because we need it to determine if we need to update
5564 // any vtable entries with new default method implementations.
5565 return SetupInterfaceLookupTable(self, klass, interfaces)
5566 && LinkVirtualMethods(self, klass, /*out*/ &default_translations)
5567 && LinkInterfaceMethods(self, klass, default_translations, out_new_conflict, out_imt);
5570 // Comparator for name and signature of a method, used in finding overriding methods. Implementation
5571 // avoids the use of handles, if it didn't then rather than compare dex files we could compare dex
5572 // caches in the implementation below.
5573 class MethodNameAndSignatureComparator FINAL : public ValueObject {
5575 explicit MethodNameAndSignatureComparator(ArtMethod* method)
5576 SHARED_REQUIRES(Locks::mutator_lock_) :
5577 dex_file_(method->GetDexFile()), mid_(&dex_file_->GetMethodId(method->GetDexMethodIndex())),
5578 name_(nullptr), name_len_(0) {
5579 DCHECK(!method->IsProxyMethod()) << PrettyMethod(method);
5582 const char* GetName() {
5583 if (name_ == nullptr) {
5584 name_ = dex_file_->StringDataAndUtf16LengthByIdx(mid_->name_idx_, &name_len_);
5589 bool HasSameNameAndSignature(ArtMethod* other)
5590 SHARED_REQUIRES(Locks::mutator_lock_) {
5591 DCHECK(!other->IsProxyMethod()) << PrettyMethod(other);
5592 const DexFile* other_dex_file = other->GetDexFile();
5593 const DexFile::MethodId& other_mid = other_dex_file->GetMethodId(other->GetDexMethodIndex());
5594 if (dex_file_ == other_dex_file) {
5595 return mid_->name_idx_ == other_mid.name_idx_ && mid_->proto_idx_ == other_mid.proto_idx_;
5597 GetName(); // Only used to make sure its calculated.
5598 uint32_t other_name_len;
5599 const char* other_name = other_dex_file->StringDataAndUtf16LengthByIdx(other_mid.name_idx_,
5601 if (name_len_ != other_name_len || strcmp(name_, other_name) != 0) {
5604 return dex_file_->GetMethodSignature(*mid_) == other_dex_file->GetMethodSignature(other_mid);
5608 // Dex file for the method to compare against.
5609 const DexFile* const dex_file_;
5610 // MethodId for the method to compare against.
5611 const DexFile::MethodId* const mid_;
5612 // Lazily computed name from the dex file's strings.
5614 // Lazily computed name length.
5618 class LinkVirtualHashTable {
5620 LinkVirtualHashTable(Handle<mirror::Class> klass,
5622 uint32_t* hash_table,
5623 size_t image_pointer_size)
5625 hash_size_(hash_size),
5626 hash_table_(hash_table),
5627 image_pointer_size_(image_pointer_size) {
5628 std::fill(hash_table_, hash_table_ + hash_size_, invalid_index_);
5631 void Add(uint32_t virtual_method_index) SHARED_REQUIRES(Locks::mutator_lock_) {
5632 ArtMethod* local_method = klass_->GetVirtualMethodDuringLinking(
5633 virtual_method_index, image_pointer_size_);
5634 const char* name = local_method->GetInterfaceMethodIfProxy(image_pointer_size_)->GetName();
5635 uint32_t hash = ComputeModifiedUtf8Hash(name);
5636 uint32_t index = hash % hash_size_;
5637 // Linear probe until we have an empty slot.
5638 while (hash_table_[index] != invalid_index_) {
5639 if (++index == hash_size_) {
5643 hash_table_[index] = virtual_method_index;
5646 uint32_t FindAndRemove(MethodNameAndSignatureComparator* comparator)
5647 SHARED_REQUIRES(Locks::mutator_lock_) {
5648 const char* name = comparator->GetName();
5649 uint32_t hash = ComputeModifiedUtf8Hash(name);
5650 size_t index = hash % hash_size_;
5652 const uint32_t value = hash_table_[index];
5653 // Since linear probe makes continuous blocks, hitting an invalid index means we are done
5654 // the block and can safely assume not found.
5655 if (value == invalid_index_) {
5658 if (value != removed_index_) { // This signifies not already overriden.
5659 ArtMethod* virtual_method =
5660 klass_->GetVirtualMethodDuringLinking(value, image_pointer_size_);
5661 if (comparator->HasSameNameAndSignature(
5662 virtual_method->GetInterfaceMethodIfProxy(image_pointer_size_))) {
5663 hash_table_[index] = removed_index_;
5667 if (++index == hash_size_) {
5671 return GetNotFoundIndex();
5674 static uint32_t GetNotFoundIndex() {
5675 return invalid_index_;
5679 static const uint32_t invalid_index_;
5680 static const uint32_t removed_index_;
5682 Handle<mirror::Class> klass_;
5683 const size_t hash_size_;
5684 uint32_t* const hash_table_;
5685 const size_t image_pointer_size_;
5688 const uint32_t LinkVirtualHashTable::invalid_index_ = std::numeric_limits<uint32_t>::max();
5689 const uint32_t LinkVirtualHashTable::removed_index_ = std::numeric_limits<uint32_t>::max() - 1;
5691 bool ClassLinker::LinkVirtualMethods(
5693 Handle<mirror::Class> klass,
5694 /*out*/std::unordered_map<size_t, ClassLinker::MethodTranslation>* default_translations) {
5695 const size_t num_virtual_methods = klass->NumVirtualMethods();
5696 if (klass->IsInterface()) {
5698 if (!IsUint<16>(num_virtual_methods)) {
5699 ThrowClassFormatError(klass.Get(), "Too many methods on interface: %zu", num_virtual_methods);
5702 bool has_defaults = false;
5703 // Assign each method an IMT index and set the default flag.
5704 for (size_t i = 0; i < num_virtual_methods; ++i) {
5705 ArtMethod* m = klass->GetVirtualMethodDuringLinking(i, image_pointer_size_);
5706 m->SetMethodIndex(i);
5707 if (!m->IsAbstract()) {
5708 m->SetAccessFlags(m->GetAccessFlags() | kAccDefault);
5709 has_defaults = true;
5712 // Mark that we have default methods so that we won't need to scan the virtual_methods_ array
5713 // during initialization. This is a performance optimization. We could simply traverse the
5714 // virtual_methods_ array again during initialization.
5716 klass->SetHasDefaultMethods();
5719 } else if (klass->HasSuperClass()) {
5720 const size_t super_vtable_length = klass->GetSuperClass()->GetVTableLength();
5721 const size_t max_count = num_virtual_methods + super_vtable_length;
5722 StackHandleScope<2> hs(self);
5723 Handle<mirror::Class> super_class(hs.NewHandle(klass->GetSuperClass()));
5724 MutableHandle<mirror::PointerArray> vtable;
5725 if (super_class->ShouldHaveEmbeddedVTable()) {
5726 vtable = hs.NewHandle(AllocPointerArray(self, max_count));
5727 if (UNLIKELY(vtable.Get() == nullptr)) {
5728 self->AssertPendingOOMException();
5731 for (size_t i = 0; i < super_vtable_length; i++) {
5732 vtable->SetElementPtrSize(
5733 i, super_class->GetEmbeddedVTableEntry(i, image_pointer_size_), image_pointer_size_);
5735 // We might need to change vtable if we have new virtual methods or new interfaces (since that
5736 // might give us new default methods). If no new interfaces then we can skip the rest since
5737 // the class cannot override any of the super-class's methods. This is required for
5738 // correctness since without it we might not update overridden default method vtable entries
5740 if (num_virtual_methods == 0 && super_class->GetIfTableCount() == klass->GetIfTableCount()) {
5741 klass->SetVTable(vtable.Get());
5745 DCHECK(super_class->IsAbstract() && !super_class->IsArrayClass());
5746 auto* super_vtable = super_class->GetVTable();
5747 CHECK(super_vtable != nullptr) << PrettyClass(super_class.Get());
5748 // We might need to change vtable if we have new virtual methods or new interfaces (since that
5749 // might give us new default methods). See comment above.
5750 if (num_virtual_methods == 0 && super_class->GetIfTableCount() == klass->GetIfTableCount()) {
5751 klass->SetVTable(super_vtable);
5754 vtable = hs.NewHandle(down_cast<mirror::PointerArray*>(
5755 super_vtable->CopyOf(self, max_count)));
5756 if (UNLIKELY(vtable.Get() == nullptr)) {
5757 self->AssertPendingOOMException();
5761 // How the algorithm works:
5762 // 1. Populate hash table by adding num_virtual_methods from klass. The values in the hash
5763 // table are: invalid_index for unused slots, index super_vtable_length + i for a virtual
5764 // method which has not been matched to a vtable method, and j if the virtual method at the
5765 // index overrode the super virtual method at index j.
5766 // 2. Loop through super virtual methods, if they overwrite, update hash table to j
5767 // (j < super_vtable_length) to avoid redundant checks. (TODO maybe use this info for reducing
5768 // the need for the initial vtable which we later shrink back down).
5769 // 3. Add non overridden methods to the end of the vtable.
5770 static constexpr size_t kMaxStackHash = 250;
5771 // + 1 so that even if we only have new default methods we will still be able to use this hash
5772 // table (i.e. it will never have 0 size).
5773 const size_t hash_table_size = num_virtual_methods * 3 + 1;
5774 uint32_t* hash_table_ptr;
5775 std::unique_ptr<uint32_t[]> hash_heap_storage;
5776 if (hash_table_size <= kMaxStackHash) {
5777 hash_table_ptr = reinterpret_cast<uint32_t*>(
5778 alloca(hash_table_size * sizeof(*hash_table_ptr)));
5780 hash_heap_storage.reset(new uint32_t[hash_table_size]);
5781 hash_table_ptr = hash_heap_storage.get();
5783 LinkVirtualHashTable hash_table(klass, hash_table_size, hash_table_ptr, image_pointer_size_);
5784 // Add virtual methods to the hash table.
5785 for (size_t i = 0; i < num_virtual_methods; ++i) {
5786 DCHECK(klass->GetVirtualMethodDuringLinking(
5787 i, image_pointer_size_)->GetDeclaringClass() != nullptr);
5790 // Loop through each super vtable method and see if they are overridden by a method we added to
5792 for (size_t j = 0; j < super_vtable_length; ++j) {
5793 // Search the hash table to see if we are overridden by any method.
5794 ArtMethod* super_method = vtable->GetElementPtrSize<ArtMethod*>(j, image_pointer_size_);
5795 MethodNameAndSignatureComparator super_method_name_comparator(
5796 super_method->GetInterfaceMethodIfProxy(image_pointer_size_));
5797 uint32_t hash_index = hash_table.FindAndRemove(&super_method_name_comparator);
5798 if (hash_index != hash_table.GetNotFoundIndex()) {
5799 ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(
5800 hash_index, image_pointer_size_);
5801 if (klass->CanAccessMember(super_method->GetDeclaringClass(),
5802 super_method->GetAccessFlags())) {
5803 if (super_method->IsFinal()) {
5804 ThrowLinkageError(klass.Get(), "Method %s overrides final method in class %s",
5805 PrettyMethod(virtual_method).c_str(),
5806 super_method->GetDeclaringClassDescriptor());
5809 vtable->SetElementPtrSize(j, virtual_method, image_pointer_size_);
5810 virtual_method->SetMethodIndex(j);
5812 LOG(WARNING) << "Before Android 4.1, method " << PrettyMethod(virtual_method)
5813 << " would have incorrectly overridden the package-private method in "
5814 << PrettyDescriptor(super_method->GetDeclaringClassDescriptor());
5816 } else if (super_method->IsOverridableByDefaultMethod()) {
5817 // We didn't directly override this method but we might through default methods...
5818 // Check for default method update.
5819 ArtMethod* default_method = nullptr;
5820 switch (FindDefaultMethodImplementation(self,
5823 /*out*/&default_method)) {
5824 case DefaultMethodSearchResult::kDefaultConflict: {
5825 // A conflict was found looking for default methods. Note this (assuming it wasn't
5826 // pre-existing) in the translations map.
5827 if (UNLIKELY(!super_method->IsDefaultConflicting())) {
5828 // Don't generate another conflict method to reduce memory use as an optimization.
5829 default_translations->insert(
5830 {j, ClassLinker::MethodTranslation::CreateConflictingMethod()});
5834 case DefaultMethodSearchResult::kAbstractFound: {
5835 // No conflict but method is abstract.
5836 // We note that this vtable entry must be made abstract.
5837 if (UNLIKELY(!super_method->IsAbstract())) {
5838 default_translations->insert(
5839 {j, ClassLinker::MethodTranslation::CreateAbstractMethod()});
5843 case DefaultMethodSearchResult::kDefaultFound: {
5844 if (UNLIKELY(super_method->IsDefaultConflicting() ||
5845 default_method->GetDeclaringClass() != super_method->GetDeclaringClass())) {
5846 // Found a default method implementation that is new.
5847 // TODO Refactor this add default methods to virtuals here and not in
5848 // LinkInterfaceMethods maybe.
5849 // The problem is default methods might override previously present
5850 // default-method or miranda-method vtable entries from the superclass.
5851 // Unfortunately we need these to be entries in this class's virtuals. We do not
5852 // give these entries there until LinkInterfaceMethods so we pass this map around
5853 // to let it know which vtable entries need to be updated.
5854 // Make a note that vtable entry j must be updated, store what it needs to be updated
5855 // to. We will allocate a virtual method slot in LinkInterfaceMethods and fix it up
5857 default_translations->insert(
5858 {j, ClassLinker::MethodTranslation::CreateTranslatedMethod(default_method)});
5859 VLOG(class_linker) << "Method " << PrettyMethod(super_method)
5860 << " overridden by default " << PrettyMethod(default_method)
5861 << " in " << PrettyClass(klass.Get());
5868 size_t actual_count = super_vtable_length;
5869 // Add the non-overridden methods at the end.
5870 for (size_t i = 0; i < num_virtual_methods; ++i) {
5871 ArtMethod* local_method = klass->GetVirtualMethodDuringLinking(i, image_pointer_size_);
5872 size_t method_idx = local_method->GetMethodIndexDuringLinking();
5873 if (method_idx < super_vtable_length &&
5874 local_method == vtable->GetElementPtrSize<ArtMethod*>(method_idx, image_pointer_size_)) {
5877 vtable->SetElementPtrSize(actual_count, local_method, image_pointer_size_);
5878 local_method->SetMethodIndex(actual_count);
5881 if (!IsUint<16>(actual_count)) {
5882 ThrowClassFormatError(klass.Get(), "Too many methods defined on class: %zd", actual_count);
5885 // Shrink vtable if possible
5886 CHECK_LE(actual_count, max_count);
5887 if (actual_count < max_count) {
5888 vtable.Assign(down_cast<mirror::PointerArray*>(vtable->CopyOf(self, actual_count)));
5889 if (UNLIKELY(vtable.Get() == nullptr)) {
5890 self->AssertPendingOOMException();
5894 klass->SetVTable(vtable.Get());
5896 CHECK_EQ(klass.Get(), GetClassRoot(kJavaLangObject));
5897 if (!IsUint<16>(num_virtual_methods)) {
5898 ThrowClassFormatError(klass.Get(), "Too many methods: %d",
5899 static_cast<int>(num_virtual_methods));
5902 auto* vtable = AllocPointerArray(self, num_virtual_methods);
5903 if (UNLIKELY(vtable == nullptr)) {
5904 self->AssertPendingOOMException();
5907 for (size_t i = 0; i < num_virtual_methods; ++i) {
5908 ArtMethod* virtual_method = klass->GetVirtualMethodDuringLinking(i, image_pointer_size_);
5909 vtable->SetElementPtrSize(i, virtual_method, image_pointer_size_);
5910 virtual_method->SetMethodIndex(i & 0xFFFF);
5912 klass->SetVTable(vtable);
5917 // Determine if the given iface has any subinterface in the given list that declares the method
5918 // specified by 'target'.
5921 // - self: The thread we are running on
5922 // - target: A comparator that will match any method that overrides the method we are checking for
5923 // - iftable: The iftable we are searching for an overriding method on.
5924 // - ifstart: The index of the interface we are checking to see if anything overrides
5925 // - iface: The interface we are checking to see if anything overrides.
5926 // - image_pointer_size:
5927 // The image pointer size.
5930 // - True: There is some method that matches the target comparator defined in an interface that
5931 // is a subtype of iface.
5932 // - False: There is no method that matches the target comparator in any interface that is a subtype
5934 static bool ContainsOverridingMethodOf(Thread* self,
5935 MethodNameAndSignatureComparator& target,
5936 Handle<mirror::IfTable> iftable,
5938 Handle<mirror::Class> iface,
5939 size_t image_pointer_size)
5940 SHARED_REQUIRES(Locks::mutator_lock_) {
5941 DCHECK(self != nullptr);
5942 DCHECK(iface.Get() != nullptr);
5943 DCHECK(iftable.Get() != nullptr);
5944 DCHECK_GE(ifstart, 0u);
5945 DCHECK_LT(ifstart, iftable->Count());
5946 DCHECK_EQ(iface.Get(), iftable->GetInterface(ifstart));
5947 DCHECK(iface->IsInterface());
5949 size_t iftable_count = iftable->Count();
5950 StackHandleScope<1> hs(self);
5951 MutableHandle<mirror::Class> current_iface(hs.NewHandle<mirror::Class>(nullptr));
5952 for (size_t k = ifstart + 1; k < iftable_count; k++) {
5953 // Skip ifstart since our current interface obviously cannot override itself.
5954 current_iface.Assign(iftable->GetInterface(k));
5955 // Iterate through every method on this interface. The order does not matter.
5956 for (ArtMethod& current_method : current_iface->GetDeclaredVirtualMethods(image_pointer_size)) {
5957 if (UNLIKELY(target.HasSameNameAndSignature(
5958 current_method.GetInterfaceMethodIfProxy(image_pointer_size)))) {
5959 // Check if the i'th interface is a subtype of this one.
5960 if (iface->IsAssignableFrom(current_iface.Get())) {
5970 // Find the default method implementation for 'interface_method' in 'klass'. Stores it into
5971 // out_default_method and returns kDefaultFound on success. If no default method was found return
5972 // kAbstractFound and store nullptr into out_default_method. If an error occurs (such as a
5973 // default_method conflict) it will return kDefaultConflict.
5974 ClassLinker::DefaultMethodSearchResult ClassLinker::FindDefaultMethodImplementation(
5976 ArtMethod* target_method,
5977 Handle<mirror::Class> klass,
5978 /*out*/ArtMethod** out_default_method) const {
5979 DCHECK(self != nullptr);
5980 DCHECK(target_method != nullptr);
5981 DCHECK(out_default_method != nullptr);
5983 *out_default_method = nullptr;
5985 // We organize the interface table so that, for interface I any subinterfaces J follow it in the
5986 // table. This lets us walk the table backwards when searching for default methods. The first one
5987 // we encounter is the best candidate since it is the most specific. Once we have found it we keep
5988 // track of it and then continue checking all other interfaces, since we need to throw an error if
5989 // we encounter conflicting default method implementations (one is not a subtype of the other).
5991 // The order of unrelated interfaces does not matter and is not defined.
5992 size_t iftable_count = klass->GetIfTableCount();
5993 if (iftable_count == 0) {
5994 // No interfaces. We have already reset out to null so just return kAbstractFound.
5995 return DefaultMethodSearchResult::kAbstractFound;
5998 StackHandleScope<3> hs(self);
5999 MutableHandle<mirror::Class> chosen_iface(hs.NewHandle<mirror::Class>(nullptr));
6000 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(klass->GetIfTable()));
6001 MutableHandle<mirror::Class> iface(hs.NewHandle<mirror::Class>(nullptr));
6002 MethodNameAndSignatureComparator target_name_comparator(
6003 target_method->GetInterfaceMethodIfProxy(image_pointer_size_));
6004 // Iterates over the klass's iftable in reverse
6005 for (size_t k = iftable_count; k != 0; ) {
6008 DCHECK_LT(k, iftable->Count());
6010 iface.Assign(iftable->GetInterface(k));
6011 // Iterate through every declared method on this interface. The order does not matter.
6012 for (auto& method_iter : iface->GetDeclaredVirtualMethods(image_pointer_size_)) {
6013 ArtMethod* current_method = &method_iter;
6014 // Skip abstract methods and methods with different names.
6015 if (current_method->IsAbstract() ||
6016 !target_name_comparator.HasSameNameAndSignature(
6017 current_method->GetInterfaceMethodIfProxy(image_pointer_size_))) {
6019 } else if (!current_method->IsPublic()) {
6020 // The verifier should have caught the non-public method for dex version 37. Just warn and
6021 // skip it since this is from before default-methods so we don't really need to care that it
6023 LOG(WARNING) << "Interface method " << PrettyMethod(current_method) << " is not public! "
6024 << "This will be a fatal error in subsequent versions of android. "
6025 << "Continuing anyway.";
6027 if (UNLIKELY(chosen_iface.Get() != nullptr)) {
6028 // We have multiple default impls of the same method. This is a potential default conflict.
6029 // We need to check if this possibly conflicting method is either a superclass of the chosen
6030 // default implementation or is overridden by a non-default interface method. In either case
6031 // there is no conflict.
6032 if (!iface->IsAssignableFrom(chosen_iface.Get()) &&
6033 !ContainsOverridingMethodOf(self,
6034 target_name_comparator,
6038 image_pointer_size_)) {
6039 VLOG(class_linker) << "Conflicting default method implementations found: "
6040 << PrettyMethod(current_method) << " and "
6041 << PrettyMethod(*out_default_method) << " in class "
6042 << PrettyClass(klass.Get()) << " conflict.";
6043 *out_default_method = nullptr;
6044 return DefaultMethodSearchResult::kDefaultConflict;
6046 break; // Continue checking at the next interface.
6049 // chosen_iface == null
6050 if (!ContainsOverridingMethodOf(self,
6051 target_name_comparator,
6055 image_pointer_size_)) {
6056 // Don't set this as the chosen interface if something else is overriding it (because that
6057 // other interface would be potentially chosen instead if it was default). If the other
6058 // interface was abstract then we wouldn't select this interface as chosen anyway since
6059 // the abstract method masks it.
6060 *out_default_method = current_method;
6061 chosen_iface.Assign(iface.Get());
6062 // We should now finish traversing the graph to find if we have default methods that
6065 VLOG(class_linker) << "A default method '" << PrettyMethod(current_method) << "' was "
6066 << "skipped because it was overridden by an abstract method in a "
6067 << "subinterface on class '" << PrettyClass(klass.Get()) << "'";
6073 if (*out_default_method != nullptr) {
6074 VLOG(class_linker) << "Default method '" << PrettyMethod(*out_default_method) << "' selected "
6075 << "as the implementation for '" << PrettyMethod(target_method) << "' "
6076 << "in '" << PrettyClass(klass.Get()) << "'";
6077 return DefaultMethodSearchResult::kDefaultFound;
6079 return DefaultMethodSearchResult::kAbstractFound;
6083 ArtMethod* ClassLinker::AddMethodToConflictTable(mirror::Class* klass,
6084 ArtMethod* conflict_method,
6085 ArtMethod* interface_method,
6087 bool force_new_conflict_method) {
6088 ImtConflictTable* current_table = conflict_method->GetImtConflictTable(sizeof(void*));
6089 Runtime* const runtime = Runtime::Current();
6090 LinearAlloc* linear_alloc = GetAllocatorForClassLoader(klass->GetClassLoader());
6091 bool new_entry = conflict_method == runtime->GetImtConflictMethod() || force_new_conflict_method;
6093 // Create a new entry if the existing one is the shared conflict method.
6094 ArtMethod* new_conflict_method = new_entry
6095 ? runtime->CreateImtConflictMethod(linear_alloc)
6098 // Allocate a new table. Note that we will leak this table at the next conflict,
6099 // but that's a tradeoff compared to making the table fixed size.
6100 void* data = linear_alloc->Alloc(
6101 Thread::Current(), ImtConflictTable::ComputeSizeWithOneMoreEntry(current_table,
6102 image_pointer_size_));
6103 if (data == nullptr) {
6104 LOG(ERROR) << "Failed to allocate conflict table";
6105 return conflict_method;
6107 ImtConflictTable* new_table = new (data) ImtConflictTable(current_table,
6110 image_pointer_size_);
6112 // Do a fence to ensure threads see the data in the table before it is assigned
6113 // to the conflict method.
6114 // Note that there is a race in the presence of multiple threads and we may leak
6115 // memory from the LinearAlloc, but that's a tradeoff compared to using
6116 // atomic operations.
6117 QuasiAtomic::ThreadFenceRelease();
6118 new_conflict_method->SetImtConflictTable(new_table, image_pointer_size_);
6119 return new_conflict_method;
6122 void ClassLinker::SetIMTRef(ArtMethod* unimplemented_method,
6123 ArtMethod* imt_conflict_method,
6124 ArtMethod* current_method,
6125 /*out*/bool* new_conflict,
6126 /*out*/ArtMethod** imt_ref) {
6127 // Place method in imt if entry is empty, place conflict otherwise.
6128 if (*imt_ref == unimplemented_method) {
6129 *imt_ref = current_method;
6130 } else if (!(*imt_ref)->IsRuntimeMethod()) {
6131 // If we are not a conflict and we have the same signature and name as the imt
6132 // entry, it must be that we overwrote a superclass vtable entry.
6133 // Note that we have checked IsRuntimeMethod, as there may be multiple different
6134 // conflict methods.
6135 MethodNameAndSignatureComparator imt_comparator(
6136 (*imt_ref)->GetInterfaceMethodIfProxy(image_pointer_size_));
6137 if (imt_comparator.HasSameNameAndSignature(
6138 current_method->GetInterfaceMethodIfProxy(image_pointer_size_))) {
6139 *imt_ref = current_method;
6141 *imt_ref = imt_conflict_method;
6142 *new_conflict = true;
6145 // Place the default conflict method. Note that there may be an existing conflict
6146 // method in the IMT, but it could be one tailored to the super class, with a
6147 // specific ImtConflictTable.
6148 *imt_ref = imt_conflict_method;
6149 *new_conflict = true;
6153 void ClassLinker::FillIMTAndConflictTables(mirror::Class* klass) {
6154 DCHECK(klass->ShouldHaveImt()) << PrettyClass(klass);
6155 DCHECK(!klass->IsTemp()) << PrettyClass(klass);
6156 ArtMethod* imt_data[ImTable::kSize];
6157 Runtime* const runtime = Runtime::Current();
6158 ArtMethod* const unimplemented_method = runtime->GetImtUnimplementedMethod();
6159 ArtMethod* const conflict_method = runtime->GetImtConflictMethod();
6160 std::fill_n(imt_data, arraysize(imt_data), unimplemented_method);
6161 if (klass->GetIfTable() != nullptr) {
6162 bool new_conflict = false;
6163 FillIMTFromIfTable(klass->GetIfTable(),
6164 unimplemented_method,
6167 /*create_conflict_tables*/true,
6168 /*ignore_copied_methods*/false,
6172 if (!klass->ShouldHaveImt()) {
6175 // Compare the IMT with the super class including the conflict methods. If they are equivalent,
6176 // we can just use the same pointer.
6177 ImTable* imt = nullptr;
6178 mirror::Class* super_class = klass->GetSuperClass();
6179 if (super_class != nullptr && super_class->ShouldHaveImt()) {
6180 ImTable* super_imt = super_class->GetImt(image_pointer_size_);
6182 for (size_t i = 0; same && i < ImTable::kSize; ++i) {
6183 ArtMethod* method = imt_data[i];
6184 ArtMethod* super_method = super_imt->Get(i, image_pointer_size_);
6185 if (method != super_method) {
6186 bool is_conflict_table = method->IsRuntimeMethod() &&
6187 method != unimplemented_method &&
6188 method != conflict_method;
6189 // Verify conflict contents.
6190 bool super_conflict_table = super_method->IsRuntimeMethod() &&
6191 super_method != unimplemented_method &&
6192 super_method != conflict_method;
6193 if (!is_conflict_table || !super_conflict_table) {
6196 ImtConflictTable* table1 = method->GetImtConflictTable(image_pointer_size_);
6197 ImtConflictTable* table2 = super_method->GetImtConflictTable(image_pointer_size_);
6198 same = same && table1->Equals(table2, image_pointer_size_);
6206 if (imt == nullptr) {
6207 imt = klass->GetImt(image_pointer_size_);
6208 DCHECK(imt != nullptr);
6209 imt->Populate(imt_data, image_pointer_size_);
6211 klass->SetImt(imt, image_pointer_size_);
6215 static inline uint32_t GetIMTIndex(ArtMethod* interface_method)
6216 SHARED_REQUIRES(Locks::mutator_lock_) {
6217 return interface_method->GetDexMethodIndex() % ImTable::kSize;
6220 ImtConflictTable* ClassLinker::CreateImtConflictTable(size_t count,
6221 LinearAlloc* linear_alloc,
6222 size_t image_pointer_size) {
6223 void* data = linear_alloc->Alloc(Thread::Current(),
6224 ImtConflictTable::ComputeSize(count,
6225 image_pointer_size));
6226 return (data != nullptr) ? new (data) ImtConflictTable(count, image_pointer_size) : nullptr;
6229 ImtConflictTable* ClassLinker::CreateImtConflictTable(size_t count, LinearAlloc* linear_alloc) {
6230 return CreateImtConflictTable(count, linear_alloc, image_pointer_size_);
6233 void ClassLinker::FillIMTFromIfTable(mirror::IfTable* if_table,
6234 ArtMethod* unimplemented_method,
6235 ArtMethod* imt_conflict_method,
6236 mirror::Class* klass,
6237 bool create_conflict_tables,
6238 bool ignore_copied_methods,
6239 /*out*/bool* new_conflict,
6240 /*out*/ArtMethod** imt) {
6241 uint32_t conflict_counts[ImTable::kSize] = {};
6242 for (size_t i = 0, length = if_table->Count(); i < length; ++i) {
6243 mirror::Class* interface = if_table->GetInterface(i);
6244 const size_t num_virtuals = interface->NumVirtualMethods();
6245 const size_t method_array_count = if_table->GetMethodArrayCount(i);
6246 // Virtual methods can be larger than the if table methods if there are default methods.
6247 DCHECK_GE(num_virtuals, method_array_count);
6248 if (kIsDebugBuild) {
6249 if (klass->IsInterface()) {
6250 DCHECK_EQ(method_array_count, 0u);
6252 DCHECK_EQ(interface->NumDeclaredVirtualMethods(), method_array_count);
6255 if (method_array_count == 0) {
6258 auto* method_array = if_table->GetMethodArray(i);
6259 for (size_t j = 0; j < method_array_count; ++j) {
6260 ArtMethod* implementation_method =
6261 method_array->GetElementPtrSize<ArtMethod*>(j, image_pointer_size_);
6262 if (ignore_copied_methods && implementation_method->IsCopied()) {
6265 DCHECK(implementation_method != nullptr);
6266 // Miranda methods cannot be used to implement an interface method, but they are safe to put
6267 // in the IMT since their entrypoint is the interface trampoline. If we put any copied methods
6268 // or interface methods in the IMT here they will not create extra conflicts since we compare
6269 // names and signatures in SetIMTRef.
6270 ArtMethod* interface_method = interface->GetVirtualMethod(j, image_pointer_size_);
6271 const uint32_t imt_index = GetIMTIndex(interface_method);
6273 // There is only any conflicts if all of the interface methods for an IMT slot don't have
6274 // the same implementation method, keep track of this to avoid creating a conflict table in
6277 // Conflict table size for each IMT slot.
6278 ++conflict_counts[imt_index];
6280 SetIMTRef(unimplemented_method,
6281 imt_conflict_method,
6282 implementation_method,
6283 /*out*/new_conflict,
6284 /*out*/&imt[imt_index]);
6288 if (create_conflict_tables) {
6289 // Create the conflict tables.
6290 LinearAlloc* linear_alloc = GetAllocatorForClassLoader(klass->GetClassLoader());
6291 for (size_t i = 0; i < ImTable::kSize; ++i) {
6292 size_t conflicts = conflict_counts[i];
6293 if (imt[i] == imt_conflict_method) {
6294 ImtConflictTable* new_table = CreateImtConflictTable(conflicts, linear_alloc);
6295 if (new_table != nullptr) {
6296 ArtMethod* new_conflict_method =
6297 Runtime::Current()->CreateImtConflictMethod(linear_alloc);
6298 new_conflict_method->SetImtConflictTable(new_table, image_pointer_size_);
6299 imt[i] = new_conflict_method;
6301 LOG(ERROR) << "Failed to allocate conflict table";
6302 imt[i] = imt_conflict_method;
6305 DCHECK_NE(imt[i], imt_conflict_method);
6309 for (size_t i = 0, length = if_table->Count(); i < length; ++i) {
6310 mirror::Class* interface = if_table->GetInterface(i);
6311 const size_t method_array_count = if_table->GetMethodArrayCount(i);
6312 // Virtual methods can be larger than the if table methods if there are default methods.
6313 if (method_array_count == 0) {
6316 auto* method_array = if_table->GetMethodArray(i);
6317 for (size_t j = 0; j < method_array_count; ++j) {
6318 ArtMethod* implementation_method =
6319 method_array->GetElementPtrSize<ArtMethod*>(j, image_pointer_size_);
6320 if (ignore_copied_methods && implementation_method->IsCopied()) {
6323 DCHECK(implementation_method != nullptr);
6324 ArtMethod* interface_method = interface->GetVirtualMethod(j, image_pointer_size_);
6325 const uint32_t imt_index = GetIMTIndex(interface_method);
6326 if (!imt[imt_index]->IsRuntimeMethod() ||
6327 imt[imt_index] == unimplemented_method ||
6328 imt[imt_index] == imt_conflict_method) {
6331 ImtConflictTable* table = imt[imt_index]->GetImtConflictTable(image_pointer_size_);
6332 const size_t num_entries = table->NumEntries(image_pointer_size_);
6333 table->SetInterfaceMethod(num_entries, image_pointer_size_, interface_method);
6334 table->SetImplementationMethod(num_entries, image_pointer_size_, implementation_method);
6340 // Simple helper function that checks that no subtypes of 'val' are contained within the 'classes'
6342 static bool NotSubinterfaceOfAny(const std::unordered_set<mirror::Class*>& classes,
6344 REQUIRES(Roles::uninterruptible_)
6345 SHARED_REQUIRES(Locks::mutator_lock_) {
6346 DCHECK(val != nullptr);
6347 for (auto c : classes) {
6348 if (val->IsAssignableFrom(&*c)) {
6355 // Fills in and flattens the interface inheritance hierarchy.
6357 // By the end of this function all interfaces in the transitive closure of to_process are added to
6358 // the iftable and every interface precedes all of its sub-interfaces in this list.
6360 // all I, J: Interface | I <: J implies J precedes I
6362 // (note A <: B means that A is a subtype of B)
6364 // This returns the total number of items in the iftable. The iftable might be resized down after
6367 // We order this backwards so that we do not need to reorder superclass interfaces when new
6368 // interfaces are added in subclass's interface tables.
6370 // Upon entry into this function iftable is a copy of the superclass's iftable with the first
6371 // super_ifcount entries filled in with the transitive closure of the interfaces of the superclass.
6372 // The other entries are uninitialized. We will fill in the remaining entries in this function. The
6373 // iftable must be large enough to hold all interfaces without changing its size.
6374 static size_t FillIfTable(mirror::IfTable* iftable,
6375 size_t super_ifcount,
6376 std::vector<mirror::Class*> to_process)
6377 REQUIRES(Roles::uninterruptible_)
6378 SHARED_REQUIRES(Locks::mutator_lock_) {
6379 // This is the set of all class's already in the iftable. Used to make checking if a class has
6380 // already been added quicker.
6381 std::unordered_set<mirror::Class*> classes_in_iftable;
6382 // The first super_ifcount elements are from the superclass. We note that they are already added.
6383 for (size_t i = 0; i < super_ifcount; i++) {
6384 mirror::Class* iface = iftable->GetInterface(i);
6385 DCHECK(NotSubinterfaceOfAny(classes_in_iftable, iface)) << "Bad ordering.";
6386 classes_in_iftable.insert(iface);
6388 size_t filled_ifcount = super_ifcount;
6389 for (mirror::Class* interface : to_process) {
6390 // Let us call the first filled_ifcount elements of iftable the current-iface-list.
6391 // At this point in the loop current-iface-list has the invariant that:
6392 // for every pair of interfaces I,J within it:
6393 // if index_of(I) < index_of(J) then I is not a subtype of J
6395 // If we have already seen this element then all of its super-interfaces must already be in the
6396 // current-iface-list so we can skip adding it.
6397 if (!ContainsElement(classes_in_iftable, interface)) {
6398 // We haven't seen this interface so add all of its super-interfaces onto the
6399 // current-iface-list, skipping those already on it.
6400 int32_t ifcount = interface->GetIfTableCount();
6401 for (int32_t j = 0; j < ifcount; j++) {
6402 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j);
6403 if (!ContainsElement(classes_in_iftable, super_interface)) {
6404 DCHECK(NotSubinterfaceOfAny(classes_in_iftable, super_interface)) << "Bad ordering.";
6405 classes_in_iftable.insert(super_interface);
6406 iftable->SetInterface(filled_ifcount, super_interface);
6410 DCHECK(NotSubinterfaceOfAny(classes_in_iftable, interface)) << "Bad ordering";
6411 // Place this interface onto the current-iface-list after all of its super-interfaces.
6412 classes_in_iftable.insert(interface);
6413 iftable->SetInterface(filled_ifcount, interface);
6415 } else if (kIsDebugBuild) {
6416 // Check all super-interfaces are already in the list.
6417 int32_t ifcount = interface->GetIfTableCount();
6418 for (int32_t j = 0; j < ifcount; j++) {
6419 mirror::Class* super_interface = interface->GetIfTable()->GetInterface(j);
6420 DCHECK(ContainsElement(classes_in_iftable, super_interface))
6421 << "Iftable does not contain " << PrettyClass(super_interface)
6422 << ", a superinterface of " << PrettyClass(interface);
6426 if (kIsDebugBuild) {
6427 // Check that the iftable is ordered correctly.
6428 for (size_t i = 0; i < filled_ifcount; i++) {
6429 mirror::Class* if_a = iftable->GetInterface(i);
6430 for (size_t j = i + 1; j < filled_ifcount; j++) {
6431 mirror::Class* if_b = iftable->GetInterface(j);
6433 CHECK(!if_b->IsAssignableFrom(if_a))
6434 << "Bad interface order: " << PrettyClass(if_a) << " (index " << i << ") extends "
6435 << PrettyClass(if_b) << " (index " << j << ") and so should be after it in the "
6436 << "interface list.";
6440 return filled_ifcount;
6443 bool ClassLinker::SetupInterfaceLookupTable(Thread* self, Handle<mirror::Class> klass,
6444 Handle<mirror::ObjectArray<mirror::Class>> interfaces) {
6445 StackHandleScope<1> hs(self);
6446 const size_t super_ifcount =
6447 klass->HasSuperClass() ? klass->GetSuperClass()->GetIfTableCount() : 0U;
6448 const bool have_interfaces = interfaces.Get() != nullptr;
6449 const size_t num_interfaces =
6450 have_interfaces ? interfaces->GetLength() : klass->NumDirectInterfaces();
6451 if (num_interfaces == 0) {
6452 if (super_ifcount == 0) {
6453 // Class implements no interfaces.
6454 DCHECK_EQ(klass->GetIfTableCount(), 0);
6455 DCHECK(klass->GetIfTable() == nullptr);
6458 // Class implements same interfaces as parent, are any of these not marker interfaces?
6459 bool has_non_marker_interface = false;
6460 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable();
6461 for (size_t i = 0; i < super_ifcount; ++i) {
6462 if (super_iftable->GetMethodArrayCount(i) > 0) {
6463 has_non_marker_interface = true;
6467 // Class just inherits marker interfaces from parent so recycle parent's iftable.
6468 if (!has_non_marker_interface) {
6469 klass->SetIfTable(super_iftable);
6473 size_t ifcount = super_ifcount + num_interfaces;
6474 // Check that every class being implemented is an interface.
6475 for (size_t i = 0; i < num_interfaces; i++) {
6476 mirror::Class* interface = have_interfaces
6477 ? interfaces->GetWithoutChecks(i)
6478 : mirror::Class::GetDirectInterface(self, klass, i);
6479 DCHECK(interface != nullptr);
6480 if (UNLIKELY(!interface->IsInterface())) {
6482 ThrowIncompatibleClassChangeError(klass.Get(),
6483 "Class %s implements non-interface class %s",
6484 PrettyDescriptor(klass.Get()).c_str(),
6485 PrettyDescriptor(interface->GetDescriptor(&temp)).c_str());
6488 ifcount += interface->GetIfTableCount();
6490 // Create the interface function table.
6491 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(AllocIfTable(self, ifcount)));
6492 if (UNLIKELY(iftable.Get() == nullptr)) {
6493 self->AssertPendingOOMException();
6496 // Fill in table with superclass's iftable.
6497 if (super_ifcount != 0) {
6498 mirror::IfTable* super_iftable = klass->GetSuperClass()->GetIfTable();
6499 for (size_t i = 0; i < super_ifcount; i++) {
6500 mirror::Class* super_interface = super_iftable->GetInterface(i);
6501 iftable->SetInterface(i, super_interface);
6505 // Note that AllowThreadSuspension is to thread suspension as pthread_testcancel is to pthread
6506 // cancellation. That is it will suspend if one has a pending suspend request but otherwise
6507 // doesn't really do anything.
6508 self->AllowThreadSuspension();
6512 ScopedAssertNoThreadSuspension nts(self, "Copying mirror::Class*'s for FillIfTable");
6513 std::vector<mirror::Class*> to_add;
6514 for (size_t i = 0; i < num_interfaces; i++) {
6515 mirror::Class* interface = have_interfaces ? interfaces->Get(i) :
6516 mirror::Class::GetDirectInterface(self, klass, i);
6517 to_add.push_back(interface);
6520 new_ifcount = FillIfTable(iftable.Get(), super_ifcount, std::move(to_add));
6523 self->AllowThreadSuspension();
6525 // Shrink iftable in case duplicates were found
6526 if (new_ifcount < ifcount) {
6527 DCHECK_NE(num_interfaces, 0U);
6528 iftable.Assign(down_cast<mirror::IfTable*>(
6529 iftable->CopyOf(self, new_ifcount * mirror::IfTable::kMax)));
6530 if (UNLIKELY(iftable.Get() == nullptr)) {
6531 self->AssertPendingOOMException();
6534 ifcount = new_ifcount;
6536 DCHECK_EQ(new_ifcount, ifcount);
6538 klass->SetIfTable(iftable.Get());
6542 // Finds the method with a name/signature that matches cmp in the given lists of methods. The list
6543 // of methods must be unique.
6544 static ArtMethod* FindSameNameAndSignature(MethodNameAndSignatureComparator& cmp ATTRIBUTE_UNUSED) {
6548 template <typename ... Types>
6549 static ArtMethod* FindSameNameAndSignature(MethodNameAndSignatureComparator& cmp,
6550 const ScopedArenaVector<ArtMethod*>& list,
6551 const Types& ... rest)
6552 SHARED_REQUIRES(Locks::mutator_lock_) {
6553 for (ArtMethod* method : list) {
6554 if (cmp.HasSameNameAndSignature(method)) {
6558 return FindSameNameAndSignature(cmp, rest...);
6561 // Check that all vtable entries are present in this class's virtuals or are the same as a
6562 // superclasses vtable entry.
6563 static void CheckClassOwnsVTableEntries(Thread* self,
6564 Handle<mirror::Class> klass,
6565 size_t pointer_size)
6566 SHARED_REQUIRES(Locks::mutator_lock_) {
6567 StackHandleScope<2> hs(self);
6568 Handle<mirror::PointerArray> check_vtable(hs.NewHandle(klass->GetVTableDuringLinking()));
6569 mirror::Class* super_temp = (klass->HasSuperClass()) ? klass->GetSuperClass() : nullptr;
6570 Handle<mirror::Class> superclass(hs.NewHandle(super_temp));
6571 int32_t super_vtable_length = (superclass.Get() != nullptr) ? superclass->GetVTableLength() : 0;
6572 for (int32_t i = 0; i < check_vtable->GetLength(); ++i) {
6573 ArtMethod* m = check_vtable->GetElementPtrSize<ArtMethod*>(i, pointer_size);
6574 CHECK(m != nullptr);
6576 CHECK_EQ(m->GetMethodIndexDuringLinking(), i)
6577 << PrettyMethod(m) << " has an unexpected method index for its spot in the vtable for class"
6578 << PrettyClass(klass.Get());
6579 ArraySlice<ArtMethod> virtuals = klass->GetVirtualMethodsSliceUnchecked(pointer_size);
6580 auto is_same_method = [m] (const ArtMethod& meth) {
6583 CHECK((super_vtable_length > i && superclass->GetVTableEntry(i, pointer_size) == m) ||
6584 std::find_if(virtuals.begin(), virtuals.end(), is_same_method) != virtuals.end())
6585 << PrettyMethod(m) << " does not seem to be owned by current class "
6586 << PrettyClass(klass.Get()) << " or any of its superclasses!";
6590 // Check to make sure the vtable does not have duplicates. Duplicates could cause problems when a
6591 // method is overridden in a subclass.
6592 static void CheckVTableHasNoDuplicates(Thread* self,
6593 Handle<mirror::Class> klass,
6594 size_t pointer_size)
6595 SHARED_REQUIRES(Locks::mutator_lock_) {
6596 StackHandleScope<1> hs(self);
6597 Handle<mirror::PointerArray> vtable(hs.NewHandle(klass->GetVTableDuringLinking()));
6598 int32_t num_entries = vtable->GetLength();
6599 for (int32_t i = 0; i < num_entries; i++) {
6600 ArtMethod* vtable_entry = vtable->GetElementPtrSize<ArtMethod*>(i, pointer_size);
6601 // Don't bother if we cannot 'see' the vtable entry (i.e. it is a package-private member maybe).
6602 if (!klass->CanAccessMember(vtable_entry->GetDeclaringClass(),
6603 vtable_entry->GetAccessFlags())) {
6606 MethodNameAndSignatureComparator name_comparator(
6607 vtable_entry->GetInterfaceMethodIfProxy(pointer_size));
6608 for (int32_t j = i+1; j < num_entries; j++) {
6609 ArtMethod* other_entry = vtable->GetElementPtrSize<ArtMethod*>(j, pointer_size);
6610 CHECK(vtable_entry != other_entry &&
6611 !name_comparator.HasSameNameAndSignature(
6612 other_entry->GetInterfaceMethodIfProxy(pointer_size)))
6613 << "vtable entries " << i << " and " << j << " are identical for "
6614 << PrettyClass(klass.Get()) << " in method " << PrettyMethod(vtable_entry) << " and "
6615 << PrettyMethod(other_entry);
6620 static void SanityCheckVTable(Thread* self, Handle<mirror::Class> klass, size_t pointer_size)
6621 SHARED_REQUIRES(Locks::mutator_lock_) {
6622 CheckClassOwnsVTableEntries(self, klass, pointer_size);
6623 CheckVTableHasNoDuplicates(self, klass, pointer_size);
6626 void ClassLinker::FillImtFromSuperClass(Handle<mirror::Class> klass,
6627 ArtMethod* unimplemented_method,
6628 ArtMethod* imt_conflict_method,
6631 DCHECK(klass->HasSuperClass());
6632 mirror::Class* super_class = klass->GetSuperClass();
6633 if (super_class->ShouldHaveImt()) {
6634 ImTable* super_imt = super_class->GetImt(image_pointer_size_);
6635 for (size_t i = 0; i < ImTable::kSize; ++i) {
6636 imt[i] = super_imt->Get(i, image_pointer_size_);
6639 // No imt in the super class, need to reconstruct from the iftable.
6640 mirror::IfTable* if_table = super_class->GetIfTable();
6641 if (if_table != nullptr) {
6642 // Ignore copied methods since we will handle these in LinkInterfaceMethods.
6643 FillIMTFromIfTable(if_table,
6644 unimplemented_method,
6645 imt_conflict_method,
6647 /*create_conflict_table*/false,
6648 /*ignore_copied_methods*/true,
6649 /*out*/new_conflict,
6655 // TODO This method needs to be split up into several smaller methods.
6656 bool ClassLinker::LinkInterfaceMethods(
6658 Handle<mirror::Class> klass,
6659 const std::unordered_map<size_t, ClassLinker::MethodTranslation>& default_translations,
6660 bool* out_new_conflict,
6661 ArtMethod** out_imt) {
6662 StackHandleScope<3> hs(self);
6663 Runtime* const runtime = Runtime::Current();
6665 const bool is_interface = klass->IsInterface();
6666 const bool has_superclass = klass->HasSuperClass();
6667 const bool fill_tables = !is_interface;
6668 const size_t super_ifcount = has_superclass ? klass->GetSuperClass()->GetIfTableCount() : 0U;
6669 const size_t method_alignment = ArtMethod::Alignment(image_pointer_size_);
6670 const size_t method_size = ArtMethod::Size(image_pointer_size_);
6671 const size_t ifcount = klass->GetIfTableCount();
6673 MutableHandle<mirror::IfTable> iftable(hs.NewHandle(klass->GetIfTable()));
6675 // These are allocated on the heap to begin, we then transfer to linear alloc when we re-create
6676 // the virtual methods array.
6677 // Need to use low 4GB arenas for compiler or else the pointers wont fit in 32 bit method array
6678 // during cross compilation.
6679 // Use the linear alloc pool since this one is in the low 4gb for the compiler.
6680 ArenaStack stack(runtime->GetLinearAlloc()->GetArenaPool());
6681 ScopedArenaAllocator allocator(&stack);
6683 ScopedArenaVector<ArtMethod*> default_conflict_methods(allocator.Adapter());
6684 ScopedArenaVector<ArtMethod*> overriding_default_conflict_methods(allocator.Adapter());
6685 ScopedArenaVector<ArtMethod*> miranda_methods(allocator.Adapter());
6686 ScopedArenaVector<ArtMethod*> default_methods(allocator.Adapter());
6687 ScopedArenaVector<ArtMethod*> overriding_default_methods(allocator.Adapter());
6689 MutableHandle<mirror::PointerArray> vtable(hs.NewHandle(klass->GetVTableDuringLinking()));
6690 ArtMethod* const unimplemented_method = runtime->GetImtUnimplementedMethod();
6691 ArtMethod* const imt_conflict_method = runtime->GetImtConflictMethod();
6692 // Copy the IMT from the super class if possible.
6693 const bool extend_super_iftable = has_superclass;
6694 if (has_superclass && fill_tables) {
6695 FillImtFromSuperClass(klass,
6696 unimplemented_method,
6697 imt_conflict_method,
6701 // Allocate method arrays before since we don't want miss visiting miranda method roots due to
6702 // thread suspension.
6704 for (size_t i = 0; i < ifcount; ++i) {
6705 size_t num_methods = iftable->GetInterface(i)->NumDeclaredVirtualMethods();
6706 if (num_methods > 0) {
6707 const bool is_super = i < super_ifcount;
6708 // This is an interface implemented by a super-class. Therefore we can just copy the method
6709 // array from the superclass.
6710 const bool super_interface = is_super && extend_super_iftable;
6711 mirror::PointerArray* method_array;
6712 if (super_interface) {
6713 mirror::IfTable* if_table = klass->GetSuperClass()->GetIfTable();
6714 DCHECK(if_table != nullptr);
6715 DCHECK(if_table->GetMethodArray(i) != nullptr);
6716 // If we are working on a super interface, try extending the existing method array.
6717 method_array = down_cast<mirror::PointerArray*>(if_table->GetMethodArray(i)->Clone(self));
6719 method_array = AllocPointerArray(self, num_methods);
6721 if (UNLIKELY(method_array == nullptr)) {
6722 self->AssertPendingOOMException();
6725 iftable->SetMethodArray(i, method_array);
6730 auto* old_cause = self->StartAssertNoThreadSuspension(
6731 "Copying ArtMethods for LinkInterfaceMethods");
6732 // Going in reverse to ensure that we will hit abstract methods that override defaults before the
6733 // defaults. This means we don't need to do any trickery when creating the Miranda methods, since
6734 // they will already be null. This has the additional benefit that the declarer of a miranda
6735 // method will actually declare an abstract method.
6736 for (size_t i = ifcount; i != 0; ) {
6740 DCHECK_LT(i, ifcount);
6742 size_t num_methods = iftable->GetInterface(i)->NumDeclaredVirtualMethods();
6743 if (num_methods > 0) {
6744 StackHandleScope<2> hs2(self);
6745 const bool is_super = i < super_ifcount;
6746 const bool super_interface = is_super && extend_super_iftable;
6747 // We don't actually create or fill these tables for interfaces, we just copy some methods for
6748 // conflict methods. Just set this as nullptr in those cases.
6749 Handle<mirror::PointerArray> method_array(fill_tables
6750 ? hs2.NewHandle(iftable->GetMethodArray(i))
6751 : hs2.NewHandle<mirror::PointerArray>(nullptr));
6753 ArraySlice<ArtMethod> input_virtual_methods;
6754 ScopedNullHandle<mirror::PointerArray> null_handle;
6755 Handle<mirror::PointerArray> input_vtable_array(null_handle);
6756 int32_t input_array_length = 0;
6758 // TODO Cleanup Needed: In the presence of default methods this optimization is rather dirty
6759 // and confusing. Default methods should always look through all the superclasses
6760 // because they are the last choice of an implementation. We get around this by looking
6761 // at the super-classes iftable methods (copied into method_array previously) when we are
6762 // looking for the implementation of a super-interface method but that is rather dirty.
6763 bool using_virtuals;
6764 if (super_interface || is_interface) {
6765 // If we are overwriting a super class interface, try to only virtual methods instead of the
6767 using_virtuals = true;
6768 input_virtual_methods = klass->GetDeclaredMethodsSlice(image_pointer_size_);
6769 input_array_length = input_virtual_methods.size();
6771 // For a new interface, however, we need the whole vtable in case a new
6772 // interface method is implemented in the whole superclass.
6773 using_virtuals = false;
6774 DCHECK(vtable.Get() != nullptr);
6775 input_vtable_array = vtable;
6776 input_array_length = input_vtable_array->GetLength();
6779 // For each method in interface
6780 for (size_t j = 0; j < num_methods; ++j) {
6781 auto* interface_method = iftable->GetInterface(i)->GetVirtualMethod(j, image_pointer_size_);
6782 MethodNameAndSignatureComparator interface_name_comparator(
6783 interface_method->GetInterfaceMethodIfProxy(image_pointer_size_));
6784 uint32_t imt_index = GetIMTIndex(interface_method);
6785 ArtMethod** imt_ptr = &out_imt[imt_index];
6786 // For each method listed in the interface's method list, find the
6787 // matching method in our class's method list. We want to favor the
6788 // subclass over the superclass, which just requires walking
6789 // back from the end of the vtable. (This only matters if the
6790 // superclass defines a private method and this class redefines
6791 // it -- otherwise it would use the same vtable slot. In .dex files
6792 // those don't end up in the virtual method table, so it shouldn't
6793 // matter which direction we go. We walk it backward anyway.)
6795 // To find defaults we need to do the same but also go over interfaces.
6796 bool found_impl = false;
6797 ArtMethod* vtable_impl = nullptr;
6798 for (int32_t k = input_array_length - 1; k >= 0; --k) {
6799 ArtMethod* vtable_method = using_virtuals ?
6800 &input_virtual_methods[k] :
6801 input_vtable_array->GetElementPtrSize<ArtMethod*>(k, image_pointer_size_);
6802 ArtMethod* vtable_method_for_name_comparison =
6803 vtable_method->GetInterfaceMethodIfProxy(image_pointer_size_);
6804 if (interface_name_comparator.HasSameNameAndSignature(
6805 vtable_method_for_name_comparison)) {
6806 if (!vtable_method->IsAbstract() && !vtable_method->IsPublic()) {
6807 // Must do EndAssertNoThreadSuspension before throw since the throw can cause
6809 self->EndAssertNoThreadSuspension(old_cause);
6810 ThrowIllegalAccessError(klass.Get(),
6811 "Method '%s' implementing interface method '%s' is not public",
6812 PrettyMethod(vtable_method).c_str(), PrettyMethod(interface_method).c_str());
6814 } else if (UNLIKELY(vtable_method->IsOverridableByDefaultMethod())) {
6815 // We might have a newer, better, default method for this, so we just skip it. If we
6816 // are still using this we will select it again when scanning for default methods. To
6817 // obviate the need to copy the method again we will make a note that we already found
6819 // TODO This should be much cleaner.
6820 vtable_impl = vtable_method;
6824 if (LIKELY(fill_tables)) {
6825 method_array->SetElementPtrSize(j, vtable_method, image_pointer_size_);
6826 // Place method in imt if entry is empty, place conflict otherwise.
6827 SetIMTRef(unimplemented_method,
6828 imt_conflict_method,
6830 /*out*/out_new_conflict,
6837 // Continue on to the next method if we are done.
6838 if (LIKELY(found_impl)) {
6840 } else if (LIKELY(super_interface)) {
6841 // Don't look for a default implementation when the super-method is implemented directly
6844 // See if we can use the superclasses method and skip searching everything else.
6845 // Note: !found_impl && super_interface
6846 CHECK(extend_super_iftable);
6847 // If this is a super_interface method it is possible we shouldn't override it because a
6848 // superclass could have implemented it directly. We get the method the superclass used
6849 // to implement this to know if we can override it with a default method. Doing this is
6850 // safe since we know that the super_iftable is filled in so we can simply pull it from
6851 // there. We don't bother if this is not a super-classes interface since in that case we
6852 // have scanned the entire vtable anyway and would have found it.
6853 // TODO This is rather dirty but it is faster than searching through the entire vtable
6855 ArtMethod* supers_method =
6856 method_array->GetElementPtrSize<ArtMethod*>(j, image_pointer_size_);
6857 DCHECK(supers_method != nullptr);
6858 DCHECK(interface_name_comparator.HasSameNameAndSignature(supers_method));
6859 if (LIKELY(!supers_method->IsOverridableByDefaultMethod())) {
6860 // The method is not overridable by a default method (i.e. it is directly implemented
6861 // in some class). Therefore move onto the next interface method.
6864 // If the super-classes method is override-able by a default method we need to keep
6865 // track of it since though it is override-able it is not guaranteed to be 'overridden'.
6866 // If it turns out not to be overridden and we did not keep track of it we might add it
6867 // to the vtable twice, causing corruption in this class and possibly any subclasses.
6868 DCHECK(vtable_impl == nullptr || vtable_impl == supers_method)
6869 << "vtable_impl was " << PrettyMethod(vtable_impl) << " and not 'nullptr' or "
6870 << PrettyMethod(supers_method) << " as expected. IFTable appears to be corrupt!";
6871 vtable_impl = supers_method;
6874 // If we haven't found it yet we should search through the interfaces for default methods.
6875 ArtMethod* current_method = nullptr;
6876 switch (FindDefaultMethodImplementation(self,
6879 /*out*/¤t_method)) {
6880 case DefaultMethodSearchResult::kDefaultConflict: {
6881 // Default method conflict.
6882 DCHECK(current_method == nullptr);
6883 ArtMethod* default_conflict_method = nullptr;
6884 if (vtable_impl != nullptr && vtable_impl->IsDefaultConflicting()) {
6885 // We can reuse the method from the superclass, don't bother adding it to virtuals.
6886 default_conflict_method = vtable_impl;
6888 // See if we already have a conflict method for this method.
6889 ArtMethod* preexisting_conflict = FindSameNameAndSignature(
6890 interface_name_comparator,
6891 default_conflict_methods,
6892 overriding_default_conflict_methods);
6893 if (LIKELY(preexisting_conflict != nullptr)) {
6894 // We already have another conflict we can reuse.
6895 default_conflict_method = preexisting_conflict;
6897 // Note that we do this even if we are an interface since we need to create this and
6898 // cannot reuse another classes.
6899 // Create a new conflict method for this to use.
6900 default_conflict_method =
6901 reinterpret_cast<ArtMethod*>(allocator.Alloc(method_size));
6902 new(default_conflict_method) ArtMethod(interface_method, image_pointer_size_);
6903 if (vtable_impl == nullptr) {
6904 // Save the conflict method. We need to add it to the vtable.
6905 default_conflict_methods.push_back(default_conflict_method);
6907 // Save the conflict method but it is already in the vtable.
6908 overriding_default_conflict_methods.push_back(default_conflict_method);
6912 current_method = default_conflict_method;
6914 } // case kDefaultConflict
6915 case DefaultMethodSearchResult::kDefaultFound: {
6916 DCHECK(current_method != nullptr);
6917 // Found a default method.
6918 if (vtable_impl != nullptr &&
6919 current_method->GetDeclaringClass() == vtable_impl->GetDeclaringClass()) {
6920 // We found a default method but it was the same one we already have from our
6921 // superclass. Don't bother adding it to our vtable again.
6922 current_method = vtable_impl;
6923 } else if (LIKELY(fill_tables)) {
6924 // Interfaces don't need to copy default methods since they don't have vtables.
6925 // Only record this default method if it is new to save space.
6926 // TODO It might be worthwhile to copy default methods on interfaces anyway since it
6927 // would make lookup for interface super much faster. (We would only need to scan
6928 // the iftable to find if there is a NSME or AME.)
6929 ArtMethod* old = FindSameNameAndSignature(interface_name_comparator,
6931 overriding_default_methods);
6932 if (old == nullptr) {
6933 // We found a default method implementation and there were no conflicts.
6934 if (vtable_impl == nullptr) {
6935 // Save the default method. We need to add it to the vtable.
6936 default_methods.push_back(current_method);
6938 // Save the default method but it is already in the vtable.
6939 overriding_default_methods.push_back(current_method);
6942 CHECK(old == current_method) << "Multiple default implementations selected!";
6946 } // case kDefaultFound
6947 case DefaultMethodSearchResult::kAbstractFound: {
6948 DCHECK(current_method == nullptr);
6949 // Abstract method masks all defaults.
6950 if (vtable_impl != nullptr &&
6951 vtable_impl->IsAbstract() &&
6952 !vtable_impl->IsDefaultConflicting()) {
6953 // We need to make this an abstract method but the version in the vtable already is so
6954 // don't do anything.
6955 current_method = vtable_impl;
6958 } // case kAbstractFound
6960 if (LIKELY(fill_tables)) {
6961 if (current_method == nullptr && !super_interface) {
6962 // We could not find an implementation for this method and since it is a brand new
6963 // interface we searched the entire vtable (and all default methods) for an
6964 // implementation but couldn't find one. We therefore need to make a miranda method.
6966 // Find out if there is already a miranda method we can use.
6967 ArtMethod* miranda_method = FindSameNameAndSignature(interface_name_comparator,
6969 if (miranda_method == nullptr) {
6970 DCHECK(interface_method->IsAbstract()) << PrettyMethod(interface_method);
6971 miranda_method = reinterpret_cast<ArtMethod*>(allocator.Alloc(method_size));
6972 CHECK(miranda_method != nullptr);
6973 // Point the interface table at a phantom slot.
6974 new(miranda_method) ArtMethod(interface_method, image_pointer_size_);
6975 miranda_methods.push_back(miranda_method);
6977 current_method = miranda_method;
6980 if (current_method != nullptr) {
6981 // We found a default method implementation. Record it in the iftable and IMT.
6982 method_array->SetElementPtrSize(j, current_method, image_pointer_size_);
6983 SetIMTRef(unimplemented_method,
6984 imt_conflict_method,
6986 /*out*/out_new_conflict,
6990 } // For each method in interface end.
6991 } // if (num_methods > 0)
6992 } // For each interface.
6993 const bool has_new_virtuals = !(miranda_methods.empty() &&
6994 default_methods.empty() &&
6995 overriding_default_methods.empty() &&
6996 overriding_default_conflict_methods.empty() &&
6997 default_conflict_methods.empty());
6998 // TODO don't extend virtuals of interface unless necessary (when is it?).
6999 if (has_new_virtuals) {
7000 DCHECK(!is_interface || (default_methods.empty() && miranda_methods.empty()))
7001 << "Interfaces should only have default-conflict methods appended to them.";
7002 VLOG(class_linker) << PrettyClass(klass.Get()) << ": miranda_methods=" << miranda_methods.size()
7003 << " default_methods=" << default_methods.size()
7004 << " overriding_default_methods=" << overriding_default_methods.size()
7005 << " default_conflict_methods=" << default_conflict_methods.size()
7006 << " overriding_default_conflict_methods="
7007 << overriding_default_conflict_methods.size();
7008 const size_t old_method_count = klass->NumMethods();
7009 const size_t new_method_count = old_method_count +
7010 miranda_methods.size() +
7011 default_methods.size() +
7012 overriding_default_conflict_methods.size() +
7013 overriding_default_methods.size() +
7014 default_conflict_methods.size();
7015 // Attempt to realloc to save RAM if possible.
7016 LengthPrefixedArray<ArtMethod>* old_methods = klass->GetMethodsPtr();
7017 // The Realloced virtual methods aren't visible from the class roots, so there is no issue
7018 // where GCs could attempt to mark stale pointers due to memcpy. And since we overwrite the
7019 // realloced memory with out->CopyFrom, we are guaranteed to have objects in the to space since
7020 // CopyFrom has internal read barriers.
7022 // TODO We should maybe move some of this into mirror::Class or at least into another method.
7023 const size_t old_size = LengthPrefixedArray<ArtMethod>::ComputeSize(old_method_count,
7026 const size_t new_size = LengthPrefixedArray<ArtMethod>::ComputeSize(new_method_count,
7029 const size_t old_methods_ptr_size = (old_methods != nullptr) ? old_size : 0;
7030 auto* methods = reinterpret_cast<LengthPrefixedArray<ArtMethod>*>(
7031 runtime->GetLinearAlloc()->Realloc(self, old_methods, old_methods_ptr_size, new_size));
7032 if (UNLIKELY(methods == nullptr)) {
7033 self->AssertPendingOOMException();
7034 self->EndAssertNoThreadSuspension(old_cause);
7037 ScopedArenaUnorderedMap<ArtMethod*, ArtMethod*> move_table(allocator.Adapter());
7038 if (methods != old_methods) {
7039 // Maps from heap allocated miranda method to linear alloc miranda method.
7040 StrideIterator<ArtMethod> out = methods->begin(method_size, method_alignment);
7041 // Copy over the old methods.
7042 for (auto& m : klass->GetMethods(image_pointer_size_)) {
7043 move_table.emplace(&m, &*out);
7044 // The CopyFrom is only necessary to not miss read barriers since Realloc won't do read
7045 // barriers when it copies.
7046 out->CopyFrom(&m, image_pointer_size_);
7050 StrideIterator<ArtMethod> out(methods->begin(method_size, method_alignment) + old_method_count);
7051 // Copy over miranda methods before copying vtable since CopyOf may cause thread suspension and
7052 // we want the roots of the miranda methods to get visited.
7053 for (ArtMethod* mir_method : miranda_methods) {
7054 ArtMethod& new_method = *out;
7055 new_method.CopyFrom(mir_method, image_pointer_size_);
7056 new_method.SetAccessFlags(new_method.GetAccessFlags() | kAccMiranda | kAccCopied);
7057 DCHECK_NE(new_method.GetAccessFlags() & kAccAbstract, 0u)
7058 << "Miranda method should be abstract!";
7059 move_table.emplace(mir_method, &new_method);
7062 // We need to copy the default methods into our own method table since the runtime requires that
7063 // every method on a class's vtable be in that respective class's virtual method table.
7064 // NOTE This means that two classes might have the same implementation of a method from the same
7065 // interface but will have different ArtMethod*s for them. This also means we cannot compare a
7066 // default method found on a class with one found on the declaring interface directly and must
7067 // look at the declaring class to determine if they are the same.
7068 for (const ScopedArenaVector<ArtMethod*>& methods_vec : {default_methods,
7069 overriding_default_methods}) {
7070 for (ArtMethod* def_method : methods_vec) {
7071 ArtMethod& new_method = *out;
7072 new_method.CopyFrom(def_method, image_pointer_size_);
7073 // Clear the kAccSkipAccessChecks flag if it is present. Since this class hasn't been
7074 // verified yet it shouldn't have methods that are skipping access checks.
7075 // TODO This is rather arbitrary. We should maybe support classes where only some of its
7076 // methods are skip_access_checks.
7077 constexpr uint32_t kSetFlags = kAccDefault | kAccCopied;
7078 constexpr uint32_t kMaskFlags = ~kAccSkipAccessChecks;
7079 new_method.SetAccessFlags((new_method.GetAccessFlags() | kSetFlags) & kMaskFlags);
7080 move_table.emplace(def_method, &new_method);
7084 for (const ScopedArenaVector<ArtMethod*>& methods_vec : {default_conflict_methods,
7085 overriding_default_conflict_methods}) {
7086 for (ArtMethod* conf_method : methods_vec) {
7087 ArtMethod& new_method = *out;
7088 new_method.CopyFrom(conf_method, image_pointer_size_);
7089 // This is a type of default method (there are default method impls, just a conflict) so
7090 // mark this as a default, non-abstract method, since thats what it is. Also clear the
7091 // kAccSkipAccessChecks bit since this class hasn't been verified yet it shouldn't have
7092 // methods that are skipping access checks.
7093 constexpr uint32_t kSetFlags = kAccDefault | kAccDefaultConflict | kAccCopied;
7094 constexpr uint32_t kMaskFlags = ~(kAccAbstract | kAccSkipAccessChecks);
7095 new_method.SetAccessFlags((new_method.GetAccessFlags() | kSetFlags) & kMaskFlags);
7096 DCHECK(new_method.IsDefaultConflicting());
7097 // The actual method might or might not be marked abstract since we just copied it from a
7098 // (possibly default) interface method. We need to set it entry point to be the bridge so
7099 // that the compiler will not invoke the implementation of whatever method we copied from.
7100 EnsureThrowsInvocationError(&new_method);
7101 move_table.emplace(conf_method, &new_method);
7105 methods->SetSize(new_method_count);
7106 UpdateClassMethods(klass.Get(), methods);
7107 // Done copying methods, they are all roots in the class now, so we can end the no thread
7108 // suspension assert.
7109 self->EndAssertNoThreadSuspension(old_cause);
7112 // Update the vtable to the new method structures. We can skip this for interfaces since they
7113 // do not have vtables.
7114 const size_t old_vtable_count = vtable->GetLength();
7115 const size_t new_vtable_count = old_vtable_count +
7116 miranda_methods.size() +
7117 default_methods.size() +
7118 default_conflict_methods.size();
7120 vtable.Assign(down_cast<mirror::PointerArray*>(vtable->CopyOf(self, new_vtable_count)));
7121 if (UNLIKELY(vtable.Get() == nullptr)) {
7122 self->AssertPendingOOMException();
7125 size_t vtable_pos = old_vtable_count;
7126 // Update all the newly copied method's indexes so they denote their placement in the vtable.
7127 for (const ScopedArenaVector<ArtMethod*>& methods_vec : {default_methods,
7128 default_conflict_methods,
7130 // These are the functions that are not already in the vtable!
7131 for (ArtMethod* new_method : methods_vec) {
7132 auto translated_method_it = move_table.find(new_method);
7133 CHECK(translated_method_it != move_table.end())
7134 << "We must have a translation for methods added to the classes methods_ array! We "
7135 << "could not find the ArtMethod added for " << PrettyMethod(new_method);
7136 ArtMethod* new_vtable_method = translated_method_it->second;
7137 // Leave the declaring class alone the method's dex_code_item_offset_ and dex_method_index_
7138 // fields are references into the dex file the method was defined in. Since the ArtMethod
7139 // does not store that information it uses declaring_class_->dex_cache_.
7140 new_vtable_method->SetMethodIndex(0xFFFF & vtable_pos);
7141 vtable->SetElementPtrSize(vtable_pos, new_vtable_method, image_pointer_size_);
7145 CHECK_EQ(vtable_pos, new_vtable_count);
7146 // Update old vtable methods. We use the default_translations map to figure out what each
7147 // vtable entry should be updated to, if they need to be at all.
7148 for (size_t i = 0; i < old_vtable_count; ++i) {
7149 ArtMethod* translated_method = vtable->GetElementPtrSize<ArtMethod*>(
7150 i, image_pointer_size_);
7151 // Try and find what we need to change this method to.
7152 auto translation_it = default_translations.find(i);
7153 bool found_translation = false;
7154 if (translation_it != default_translations.end()) {
7155 if (translation_it->second.IsInConflict()) {
7156 // Find which conflict method we are to use for this method.
7157 MethodNameAndSignatureComparator old_method_comparator(
7158 translated_method->GetInterfaceMethodIfProxy(image_pointer_size_));
7159 // We only need to look through overriding_default_conflict_methods since this is an
7160 // overridden method we are fixing up here.
7161 ArtMethod* new_conflict_method = FindSameNameAndSignature(
7162 old_method_comparator, overriding_default_conflict_methods);
7163 CHECK(new_conflict_method != nullptr) << "Expected a conflict method!";
7164 translated_method = new_conflict_method;
7165 } else if (translation_it->second.IsAbstract()) {
7166 // Find which miranda method we are to use for this method.
7167 MethodNameAndSignatureComparator old_method_comparator(
7168 translated_method->GetInterfaceMethodIfProxy(image_pointer_size_));
7169 ArtMethod* miranda_method = FindSameNameAndSignature(old_method_comparator,
7171 DCHECK(miranda_method != nullptr);
7172 translated_method = miranda_method;
7174 // Normal default method (changed from an older default or abstract interface method).
7175 DCHECK(translation_it->second.IsTranslation());
7176 translated_method = translation_it->second.GetTranslation();
7178 found_translation = true;
7180 DCHECK(translated_method != nullptr);
7181 auto it = move_table.find(translated_method);
7182 if (it != move_table.end()) {
7183 auto* new_method = it->second;
7184 DCHECK(new_method != nullptr);
7185 // Make sure the new_methods index is set.
7186 if (new_method->GetMethodIndexDuringLinking() != i) {
7187 DCHECK_LE(reinterpret_cast<uintptr_t>(&*methods->begin(method_size, method_alignment)),
7188 reinterpret_cast<uintptr_t>(new_method));
7189 DCHECK_LT(reinterpret_cast<uintptr_t>(new_method),
7190 reinterpret_cast<uintptr_t>(&*methods->end(method_size, method_alignment)));
7191 new_method->SetMethodIndex(0xFFFF & i);
7193 vtable->SetElementPtrSize(i, new_method, image_pointer_size_);
7195 // If it was not going to be updated we wouldn't have put it into the default_translations
7197 CHECK(!found_translation) << "We were asked to update this vtable entry. Must not fail.";
7200 klass->SetVTable(vtable.Get());
7202 // Go fix up all the stale iftable pointers.
7203 for (size_t i = 0; i < ifcount; ++i) {
7204 for (size_t j = 0, count = iftable->GetMethodArrayCount(i); j < count; ++j) {
7205 auto* method_array = iftable->GetMethodArray(i);
7206 auto* m = method_array->GetElementPtrSize<ArtMethod*>(j, image_pointer_size_);
7207 DCHECK(m != nullptr) << PrettyClass(klass.Get());
7208 auto it = move_table.find(m);
7209 if (it != move_table.end()) {
7210 auto* new_m = it->second;
7211 DCHECK(new_m != nullptr) << PrettyClass(klass.Get());
7212 method_array->SetElementPtrSize(j, new_m, image_pointer_size_);
7218 for (size_t i = 0; i < ImTable::kSize; ++i) {
7219 auto it = move_table.find(out_imt[i]);
7220 if (it != move_table.end()) {
7221 out_imt[i] = it->second;
7226 // Check that there are no stale methods are in the dex cache array.
7227 if (kIsDebugBuild) {
7228 auto* resolved_methods = klass->GetDexCache()->GetResolvedMethods();
7229 for (size_t i = 0, count = klass->GetDexCache()->NumResolvedMethods(); i < count; ++i) {
7230 auto* m = mirror::DexCache::GetElementPtrSize(resolved_methods, i, image_pointer_size_);
7231 CHECK(move_table.find(m) == move_table.end() ||
7232 // The original versions of copied methods will still be present so allow those too.
7233 // Note that if the first check passes this might fail to GetDeclaringClass().
7234 std::find_if(m->GetDeclaringClass()->GetMethods(image_pointer_size_).begin(),
7235 m->GetDeclaringClass()->GetMethods(image_pointer_size_).end(),
7236 [m] (ArtMethod& meth) {
7238 }) != m->GetDeclaringClass()->GetMethods(image_pointer_size_).end())
7239 << "Obsolete methods " << PrettyMethod(m) << " is in dex cache!";
7242 // Put some random garbage in old methods to help find stale pointers.
7243 if (methods != old_methods && old_methods != nullptr && kIsDebugBuild) {
7244 // Need to make sure the GC is not running since it could be scanning the methods we are
7245 // about to overwrite.
7246 ScopedThreadStateChange tsc(self, kSuspended);
7247 gc::ScopedGCCriticalSection gcs(self,
7248 gc::kGcCauseClassLinker,
7249 gc::kCollectorTypeClassLinker);
7250 memset(old_methods, 0xFEu, old_size);
7253 self->EndAssertNoThreadSuspension(old_cause);
7255 if (kIsDebugBuild && !is_interface) {
7256 SanityCheckVTable(self, klass, image_pointer_size_);
7261 bool ClassLinker::LinkInstanceFields(Thread* self, Handle<mirror::Class> klass) {
7262 CHECK(klass.Get() != nullptr);
7263 return LinkFields(self, klass, false, nullptr);
7266 bool ClassLinker::LinkStaticFields(Thread* self, Handle<mirror::Class> klass, size_t* class_size) {
7267 CHECK(klass.Get() != nullptr);
7268 return LinkFields(self, klass, true, class_size);
7271 struct LinkFieldsComparator {
7272 explicit LinkFieldsComparator() SHARED_REQUIRES(Locks::mutator_lock_) {
7274 // No thread safety analysis as will be called from STL. Checked lock held in constructor.
7275 bool operator()(ArtField* field1, ArtField* field2)
7276 NO_THREAD_SAFETY_ANALYSIS {
7277 // First come reference fields, then 64-bit, then 32-bit, and then 16-bit, then finally 8-bit.
7278 Primitive::Type type1 = field1->GetTypeAsPrimitiveType();
7279 Primitive::Type type2 = field2->GetTypeAsPrimitiveType();
7280 if (type1 != type2) {
7281 if (type1 == Primitive::kPrimNot) {
7282 // Reference always goes first.
7285 if (type2 == Primitive::kPrimNot) {
7286 // Reference always goes first.
7289 size_t size1 = Primitive::ComponentSize(type1);
7290 size_t size2 = Primitive::ComponentSize(type2);
7291 if (size1 != size2) {
7292 // Larger primitive types go first.
7293 return size1 > size2;
7295 // Primitive types differ but sizes match. Arbitrarily order by primitive type.
7296 return type1 < type2;
7298 // Same basic group? Then sort by dex field index. This is guaranteed to be sorted
7299 // by name and for equal names by type id index.
7300 // NOTE: This works also for proxies. Their static fields are assigned appropriate indexes.
7301 return field1->GetDexFieldIndex() < field2->GetDexFieldIndex();
7305 bool ClassLinker::LinkFields(Thread* self,
7306 Handle<mirror::Class> klass,
7308 size_t* class_size) {
7309 self->AllowThreadSuspension();
7310 const size_t num_fields = is_static ? klass->NumStaticFields() : klass->NumInstanceFields();
7311 LengthPrefixedArray<ArtField>* const fields = is_static ? klass->GetSFieldsPtr() :
7312 klass->GetIFieldsPtr();
7314 // Initialize field_offset
7315 MemberOffset field_offset(0);
7317 field_offset = klass->GetFirstReferenceStaticFieldOffsetDuringLinking(image_pointer_size_);
7319 mirror::Class* super_class = klass->GetSuperClass();
7320 if (super_class != nullptr) {
7321 CHECK(super_class->IsResolved())
7322 << PrettyClass(klass.Get()) << " " << PrettyClass(super_class);
7323 field_offset = MemberOffset(super_class->GetObjectSize());
7327 CHECK_EQ(num_fields == 0, fields == nullptr) << PrettyClass(klass.Get());
7329 // we want a relatively stable order so that adding new fields
7330 // minimizes disruption of C++ version such as Class and Method.
7332 // The overall sort order order is:
7333 // 1) All object reference fields, sorted alphabetically.
7334 // 2) All java long (64-bit) integer fields, sorted alphabetically.
7335 // 3) All java double (64-bit) floating point fields, sorted alphabetically.
7336 // 4) All java int (32-bit) integer fields, sorted alphabetically.
7337 // 5) All java float (32-bit) floating point fields, sorted alphabetically.
7338 // 6) All java char (16-bit) integer fields, sorted alphabetically.
7339 // 7) All java short (16-bit) integer fields, sorted alphabetically.
7340 // 8) All java boolean (8-bit) integer fields, sorted alphabetically.
7341 // 9) All java byte (8-bit) integer fields, sorted alphabetically.
7343 // Once the fields are sorted in this order we will attempt to fill any gaps that might be present
7344 // in the memory layout of the structure. See ShuffleForward for how this is done.
7345 std::deque<ArtField*> grouped_and_sorted_fields;
7346 const char* old_no_suspend_cause = self->StartAssertNoThreadSuspension(
7347 "Naked ArtField references in deque");
7348 for (size_t i = 0; i < num_fields; i++) {
7349 grouped_and_sorted_fields.push_back(&fields->At(i));
7351 std::sort(grouped_and_sorted_fields.begin(), grouped_and_sorted_fields.end(),
7352 LinkFieldsComparator());
7354 // References should be at the front.
7355 size_t current_field = 0;
7356 size_t num_reference_fields = 0;
7359 for (; current_field < num_fields; current_field++) {
7360 ArtField* field = grouped_and_sorted_fields.front();
7361 Primitive::Type type = field->GetTypeAsPrimitiveType();
7362 bool isPrimitive = type != Primitive::kPrimNot;
7364 break; // past last reference, move on to the next phase
7366 if (UNLIKELY(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(
7367 field_offset.Uint32Value()))) {
7368 MemberOffset old_offset = field_offset;
7369 field_offset = MemberOffset(RoundUp(field_offset.Uint32Value(), 4));
7370 AddFieldGap(old_offset.Uint32Value(), field_offset.Uint32Value(), &gaps);
7372 DCHECK_ALIGNED(field_offset.Uint32Value(), sizeof(mirror::HeapReference<mirror::Object>));
7373 grouped_and_sorted_fields.pop_front();
7374 num_reference_fields++;
7375 field->SetOffset(field_offset);
7376 field_offset = MemberOffset(field_offset.Uint32Value() +
7377 sizeof(mirror::HeapReference<mirror::Object>));
7379 // Gaps are stored as a max heap which means that we must shuffle from largest to smallest
7380 // otherwise we could end up with suboptimal gap fills.
7381 ShuffleForward<8>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps);
7382 ShuffleForward<4>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps);
7383 ShuffleForward<2>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps);
7384 ShuffleForward<1>(¤t_field, &field_offset, &grouped_and_sorted_fields, &gaps);
7385 CHECK(grouped_and_sorted_fields.empty()) << "Missed " << grouped_and_sorted_fields.size() <<
7387 self->EndAssertNoThreadSuspension(old_no_suspend_cause);
7389 // We lie to the GC about the java.lang.ref.Reference.referent field, so it doesn't scan it.
7390 if (!is_static && klass->DescriptorEquals("Ljava/lang/ref/Reference;")) {
7391 // We know there are no non-reference fields in the Reference classes, and we know
7392 // that 'referent' is alphabetically last, so this is easy...
7393 CHECK_EQ(num_reference_fields, num_fields) << PrettyClass(klass.Get());
7394 CHECK_STREQ(fields->At(num_fields - 1).GetName(), "referent")
7395 << PrettyClass(klass.Get());
7396 --num_reference_fields;
7399 size_t size = field_offset.Uint32Value();
7402 klass->SetNumReferenceStaticFields(num_reference_fields);
7405 klass->SetNumReferenceInstanceFields(num_reference_fields);
7406 mirror::Class* super_class = klass->GetSuperClass();
7407 if (num_reference_fields == 0 || super_class == nullptr) {
7408 // object has one reference field, klass, but we ignore it since we always visit the class.
7409 // super_class is null iff the class is java.lang.Object.
7410 if (super_class == nullptr ||
7411 (super_class->GetClassFlags() & mirror::kClassFlagNoReferenceFields) != 0) {
7412 klass->SetClassFlags(klass->GetClassFlags() | mirror::kClassFlagNoReferenceFields);
7415 if (kIsDebugBuild) {
7416 DCHECK_EQ(super_class == nullptr, klass->DescriptorEquals("Ljava/lang/Object;"));
7417 size_t total_reference_instance_fields = 0;
7418 mirror::Class* cur_super = klass.Get();
7419 while (cur_super != nullptr) {
7420 total_reference_instance_fields += cur_super->NumReferenceInstanceFieldsDuringLinking();
7421 cur_super = cur_super->GetSuperClass();
7423 if (super_class == nullptr) {
7424 CHECK_EQ(total_reference_instance_fields, 1u) << PrettyDescriptor(klass.Get());
7426 // Check that there is at least num_reference_fields other than Object.class.
7427 CHECK_GE(total_reference_instance_fields, 1u + num_reference_fields)
7428 << PrettyClass(klass.Get());
7431 if (!klass->IsVariableSize()) {
7433 DCHECK_GE(size, sizeof(mirror::Object)) << klass->GetDescriptor(&temp);
7434 size_t previous_size = klass->GetObjectSize();
7435 if (previous_size != 0) {
7436 // Make sure that we didn't originally have an incorrect size.
7437 CHECK_EQ(previous_size, size) << klass->GetDescriptor(&temp);
7439 klass->SetObjectSize(size);
7443 if (kIsDebugBuild) {
7444 // Make sure that the fields array is ordered by name but all reference
7445 // offsets are at the beginning as far as alignment allows.
7446 MemberOffset start_ref_offset = is_static
7447 ? klass->GetFirstReferenceStaticFieldOffsetDuringLinking(image_pointer_size_)
7448 : klass->GetFirstReferenceInstanceFieldOffset();
7449 MemberOffset end_ref_offset(start_ref_offset.Uint32Value() +
7450 num_reference_fields *
7451 sizeof(mirror::HeapReference<mirror::Object>));
7452 MemberOffset current_ref_offset = start_ref_offset;
7453 for (size_t i = 0; i < num_fields; i++) {
7454 ArtField* field = &fields->At(i);
7455 VLOG(class_linker) << "LinkFields: " << (is_static ? "static" : "instance")
7456 << " class=" << PrettyClass(klass.Get()) << " field=" << PrettyField(field) << " offset="
7457 << field->GetOffsetDuringLinking();
7459 ArtField* const prev_field = &fields->At(i - 1);
7460 // NOTE: The field names can be the same. This is not possible in the Java language
7461 // but it's valid Java/dex bytecode and for example proguard can generate such bytecode.
7462 DCHECK_LE(strcmp(prev_field->GetName(), field->GetName()), 0);
7464 Primitive::Type type = field->GetTypeAsPrimitiveType();
7465 bool is_primitive = type != Primitive::kPrimNot;
7466 if (klass->DescriptorEquals("Ljava/lang/ref/Reference;") &&
7467 strcmp("referent", field->GetName()) == 0) {
7468 is_primitive = true; // We lied above, so we have to expect a lie here.
7470 MemberOffset offset = field->GetOffsetDuringLinking();
7472 if (offset.Uint32Value() < end_ref_offset.Uint32Value()) {
7473 // Shuffled before references.
7474 size_t type_size = Primitive::ComponentSize(type);
7475 CHECK_LT(type_size, sizeof(mirror::HeapReference<mirror::Object>));
7476 CHECK_LT(offset.Uint32Value(), start_ref_offset.Uint32Value());
7477 CHECK_LE(offset.Uint32Value() + type_size, start_ref_offset.Uint32Value());
7478 CHECK(!IsAligned<sizeof(mirror::HeapReference<mirror::Object>)>(offset.Uint32Value()));
7481 CHECK_EQ(current_ref_offset.Uint32Value(), offset.Uint32Value());
7482 current_ref_offset = MemberOffset(current_ref_offset.Uint32Value() +
7483 sizeof(mirror::HeapReference<mirror::Object>));
7486 CHECK_EQ(current_ref_offset.Uint32Value(), end_ref_offset.Uint32Value());
7491 // Set the bitmap of reference instance field offsets.
7492 void ClassLinker::CreateReferenceInstanceOffsets(Handle<mirror::Class> klass) {
7493 uint32_t reference_offsets = 0;
7494 mirror::Class* super_class = klass->GetSuperClass();
7495 // Leave the reference offsets as 0 for mirror::Object (the class field is handled specially).
7496 if (super_class != nullptr) {
7497 reference_offsets = super_class->GetReferenceInstanceOffsets();
7498 // Compute reference offsets unless our superclass overflowed.
7499 if (reference_offsets != mirror::Class::kClassWalkSuper) {
7500 size_t num_reference_fields = klass->NumReferenceInstanceFieldsDuringLinking();
7501 if (num_reference_fields != 0u) {
7502 // All of the fields that contain object references are guaranteed be grouped in memory
7503 // starting at an appropriately aligned address after super class object data.
7504 uint32_t start_offset = RoundUp(super_class->GetObjectSize(),
7505 sizeof(mirror::HeapReference<mirror::Object>));
7506 uint32_t start_bit = (start_offset - mirror::kObjectHeaderSize) /
7507 sizeof(mirror::HeapReference<mirror::Object>);
7508 if (start_bit + num_reference_fields > 32) {
7509 reference_offsets = mirror::Class::kClassWalkSuper;
7511 reference_offsets |= (0xffffffffu << start_bit) &
7512 (0xffffffffu >> (32 - (start_bit + num_reference_fields)));
7517 klass->SetReferenceInstanceOffsets(reference_offsets);
7520 mirror::String* ClassLinker::ResolveString(const DexFile& dex_file,
7521 uint32_t string_idx,
7522 Handle<mirror::DexCache> dex_cache) {
7523 DCHECK(dex_cache.Get() != nullptr);
7524 mirror::String* resolved = dex_cache->GetResolvedString(string_idx);
7525 if (resolved != nullptr) {
7528 uint32_t utf16_length;
7529 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length);
7530 mirror::String* string = intern_table_->InternStrong(utf16_length, utf8_data);
7531 dex_cache->SetResolvedString(string_idx, string);
7535 mirror::String* ClassLinker::LookupString(const DexFile& dex_file,
7536 uint32_t string_idx,
7537 Handle<mirror::DexCache> dex_cache) {
7538 DCHECK(dex_cache.Get() != nullptr);
7539 mirror::String* resolved = dex_cache->GetResolvedString(string_idx);
7540 if (resolved != nullptr) {
7543 uint32_t utf16_length;
7544 const char* utf8_data = dex_file.StringDataAndUtf16LengthByIdx(string_idx, &utf16_length);
7545 mirror::String* string = intern_table_->LookupStrong(Thread::Current(), utf16_length, utf8_data);
7546 if (string != nullptr) {
7547 dex_cache->SetResolvedString(string_idx, string);
7552 mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file,
7554 mirror::Class* referrer) {
7555 StackHandleScope<2> hs(Thread::Current());
7556 Handle<mirror::DexCache> dex_cache(hs.NewHandle(referrer->GetDexCache()));
7557 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(referrer->GetClassLoader()));
7558 return ResolveType(dex_file, type_idx, dex_cache, class_loader);
7561 mirror::Class* ClassLinker::ResolveType(const DexFile& dex_file,
7563 Handle<mirror::DexCache> dex_cache,
7564 Handle<mirror::ClassLoader> class_loader) {
7565 DCHECK(dex_cache.Get() != nullptr);
7566 mirror::Class* resolved = dex_cache->GetResolvedType(type_idx);
7567 if (resolved == nullptr) {
7568 Thread* self = Thread::Current();
7569 const char* descriptor = dex_file.StringByTypeIdx(type_idx);
7570 resolved = FindClass(self, descriptor, class_loader);
7571 if (resolved != nullptr) {
7572 // TODO: we used to throw here if resolved's class loader was not the
7573 // boot class loader. This was to permit different classes with the
7574 // same name to be loaded simultaneously by different loaders
7575 dex_cache->SetResolvedType(type_idx, resolved);
7577 CHECK(self->IsExceptionPending())
7578 << "Expected pending exception for failed resolution of: " << descriptor;
7579 // Convert a ClassNotFoundException to a NoClassDefFoundError.
7580 StackHandleScope<1> hs(self);
7581 Handle<mirror::Throwable> cause(hs.NewHandle(self->GetException()));
7582 if (cause->InstanceOf(GetClassRoot(kJavaLangClassNotFoundException))) {
7583 DCHECK(resolved == nullptr); // No Handle needed to preserve resolved.
7584 self->ClearException();
7585 ThrowNoClassDefFoundError("Failed resolution of: %s", descriptor);
7586 self->GetException()->SetCause(cause.Get());
7590 DCHECK((resolved == nullptr) || resolved->IsResolved() || resolved->IsErroneous())
7591 << PrettyDescriptor(resolved) << " " << resolved->GetStatus();
7595 template <ClassLinker::ResolveMode kResolveMode>
7596 ArtMethod* ClassLinker::ResolveMethod(const DexFile& dex_file,
7597 uint32_t method_idx,
7598 Handle<mirror::DexCache> dex_cache,
7599 Handle<mirror::ClassLoader> class_loader,
7600 ArtMethod* referrer,
7602 DCHECK(dex_cache.Get() != nullptr);
7603 // Check for hit in the dex cache.
7604 ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx, image_pointer_size_);
7605 if (resolved != nullptr && !resolved->IsRuntimeMethod()) {
7606 DCHECK(resolved->GetDeclaringClassUnchecked() != nullptr) << resolved->GetDexMethodIndex();
7607 if (kResolveMode == ClassLinker::kForceICCECheck) {
7608 if (resolved->CheckIncompatibleClassChange(type)) {
7609 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer);
7615 // Fail, get the declaring class.
7616 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx);
7617 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader);
7618 if (klass == nullptr) {
7619 DCHECK(Thread::Current()->IsExceptionPending());
7622 // Scan using method_idx, this saves string compares but will only hit for matching dex
7625 case kDirect: // Fall-through.
7627 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx, image_pointer_size_);
7628 DCHECK(resolved == nullptr || resolved->GetDeclaringClassUnchecked() != nullptr);
7631 // We have to check whether the method id really belongs to an interface (dex static bytecode
7632 // constraint A15). Otherwise you must not invoke-interface on it.
7634 // This is not symmetric to A12-A14 (direct, static, virtual), as using FindInterfaceMethod
7635 // assumes that the given type is an interface, and will check the interface table if the
7636 // method isn't declared in the class. So it may find an interface method (usually by name
7637 // in the handling below, but we do the constraint check early). In that case,
7638 // CheckIncompatibleClassChange will succeed (as it is called on an interface method)
7644 // class A implements I {
7647 // class B extends A {
7650 // invoke-interface B.foo
7651 // -> FindInterfaceMethod finds I.foo (interface method), not A.foo (miranda method)
7652 if (UNLIKELY(!klass->IsInterface())) {
7653 ThrowIncompatibleClassChangeError(klass,
7654 "Found class %s, but interface was expected",
7655 PrettyDescriptor(klass).c_str());
7658 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx, image_pointer_size_);
7659 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface());
7663 if (klass->IsInterface()) {
7664 resolved = klass->FindInterfaceMethod(dex_cache.Get(), method_idx, image_pointer_size_);
7666 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx, image_pointer_size_);
7670 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx, image_pointer_size_);
7673 LOG(FATAL) << "Unreachable - invocation type: " << type;
7676 if (resolved == nullptr) {
7677 // Search by name, which works across dex files.
7678 const char* name = dex_file.StringDataByIdx(method_id.name_idx_);
7679 const Signature signature = dex_file.GetMethodSignature(method_id);
7681 case kDirect: // Fall-through.
7683 resolved = klass->FindDirectMethod(name, signature, image_pointer_size_);
7684 DCHECK(resolved == nullptr || resolved->GetDeclaringClassUnchecked() != nullptr);
7687 resolved = klass->FindInterfaceMethod(name, signature, image_pointer_size_);
7688 DCHECK(resolved == nullptr || resolved->GetDeclaringClass()->IsInterface());
7691 if (klass->IsInterface()) {
7692 resolved = klass->FindInterfaceMethod(name, signature, image_pointer_size_);
7694 resolved = klass->FindVirtualMethod(name, signature, image_pointer_size_);
7698 resolved = klass->FindVirtualMethod(name, signature, image_pointer_size_);
7702 // If we found a method, check for incompatible class changes.
7703 if (LIKELY(resolved != nullptr && !resolved->CheckIncompatibleClassChange(type))) {
7704 // Be a good citizen and update the dex cache to speed subsequent calls.
7705 dex_cache->SetResolvedMethod(method_idx, resolved, image_pointer_size_);
7708 // If we had a method, it's an incompatible-class-change error.
7709 if (resolved != nullptr) {
7710 ThrowIncompatibleClassChangeError(type, resolved->GetInvokeType(), resolved, referrer);
7712 // We failed to find the method which means either an access error, an incompatible class
7713 // change, or no such method. First try to find the method among direct and virtual methods.
7714 const char* name = dex_file.StringDataByIdx(method_id.name_idx_);
7715 const Signature signature = dex_file.GetMethodSignature(method_id);
7719 resolved = klass->FindVirtualMethod(name, signature, image_pointer_size_);
7720 // Note: kDirect and kStatic are also mutually exclusive, but in that case we would
7721 // have had a resolved method before, which triggers the "true" branch above.
7726 resolved = klass->FindDirectMethod(name, signature, image_pointer_size_);
7730 // If we found something, check that it can be accessed by the referrer.
7731 bool exception_generated = false;
7732 if (resolved != nullptr && referrer != nullptr) {
7733 mirror::Class* methods_class = resolved->GetDeclaringClass();
7734 mirror::Class* referring_class = referrer->GetDeclaringClass();
7735 if (!referring_class->CanAccess(methods_class)) {
7736 ThrowIllegalAccessErrorClassForMethodDispatch(referring_class,
7740 exception_generated = true;
7741 } else if (!referring_class->CanAccessMember(methods_class, resolved->GetAccessFlags())) {
7742 ThrowIllegalAccessErrorMethod(referring_class, resolved);
7743 exception_generated = true;
7746 if (!exception_generated) {
7747 // Otherwise, throw an IncompatibleClassChangeError if we found something, and check
7748 // interface methods and throw if we find the method there. If we find nothing, throw a
7749 // NoSuchMethodError.
7753 if (resolved != nullptr) {
7754 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer);
7756 resolved = klass->FindInterfaceMethod(name, signature, image_pointer_size_);
7757 if (resolved != nullptr) {
7758 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer);
7760 ThrowNoSuchMethodError(type, klass, name, signature);
7765 if (resolved != nullptr) {
7766 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer);
7768 resolved = klass->FindVirtualMethod(name, signature, image_pointer_size_);
7769 if (resolved != nullptr) {
7770 ThrowIncompatibleClassChangeError(type, kVirtual, resolved, referrer);
7772 ThrowNoSuchMethodError(type, klass, name, signature);
7777 if (resolved != nullptr) {
7778 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer);
7780 ThrowNoSuchMethodError(type, klass, name, signature);
7784 if (resolved != nullptr) {
7785 ThrowIncompatibleClassChangeError(type, kDirect, resolved, referrer);
7787 resolved = klass->FindInterfaceMethod(name, signature, image_pointer_size_);
7788 if (resolved != nullptr) {
7789 ThrowIncompatibleClassChangeError(type, kInterface, resolved, referrer);
7791 ThrowNoSuchMethodError(type, klass, name, signature);
7798 Thread::Current()->AssertPendingException();
7803 ArtMethod* ClassLinker::ResolveMethodWithoutInvokeType(const DexFile& dex_file,
7804 uint32_t method_idx,
7805 Handle<mirror::DexCache> dex_cache,
7806 Handle<mirror::ClassLoader> class_loader) {
7807 ArtMethod* resolved = dex_cache->GetResolvedMethod(method_idx, image_pointer_size_);
7808 if (resolved != nullptr && !resolved->IsRuntimeMethod()) {
7809 DCHECK(resolved->GetDeclaringClassUnchecked() != nullptr) << resolved->GetDexMethodIndex();
7812 // Fail, get the declaring class.
7813 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx);
7814 mirror::Class* klass = ResolveType(dex_file, method_id.class_idx_, dex_cache, class_loader);
7815 if (klass == nullptr) {
7816 Thread::Current()->AssertPendingException();
7819 if (klass->IsInterface()) {
7820 LOG(FATAL) << "ResolveAmbiguousMethod: unexpected method in interface: " << PrettyClass(klass);
7824 // Search both direct and virtual methods
7825 resolved = klass->FindDirectMethod(dex_cache.Get(), method_idx, image_pointer_size_);
7826 if (resolved == nullptr) {
7827 resolved = klass->FindVirtualMethod(dex_cache.Get(), method_idx, image_pointer_size_);
7833 ArtField* ClassLinker::ResolveField(const DexFile& dex_file,
7835 Handle<mirror::DexCache> dex_cache,
7836 Handle<mirror::ClassLoader> class_loader,
7838 DCHECK(dex_cache.Get() != nullptr);
7839 ArtField* resolved = dex_cache->GetResolvedField(field_idx, image_pointer_size_);
7840 if (resolved != nullptr) {
7843 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx);
7844 Thread* const self = Thread::Current();
7845 StackHandleScope<1> hs(self);
7846 Handle<mirror::Class> klass(
7847 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader)));
7848 if (klass.Get() == nullptr) {
7849 DCHECK(Thread::Current()->IsExceptionPending());
7854 resolved = mirror::Class::FindStaticField(self, klass, dex_cache.Get(), field_idx);
7856 resolved = klass->FindInstanceField(dex_cache.Get(), field_idx);
7859 if (resolved == nullptr) {
7860 const char* name = dex_file.GetFieldName(field_id);
7861 const char* type = dex_file.GetFieldTypeDescriptor(field_id);
7863 resolved = mirror::Class::FindStaticField(self, klass, name, type);
7865 resolved = klass->FindInstanceField(name, type);
7867 if (resolved == nullptr) {
7868 ThrowNoSuchFieldError(is_static ? "static " : "instance ", klass.Get(), type, name);
7872 dex_cache->SetResolvedField(field_idx, resolved, image_pointer_size_);
7876 ArtField* ClassLinker::ResolveFieldJLS(const DexFile& dex_file,
7878 Handle<mirror::DexCache> dex_cache,
7879 Handle<mirror::ClassLoader> class_loader) {
7880 DCHECK(dex_cache.Get() != nullptr);
7881 ArtField* resolved = dex_cache->GetResolvedField(field_idx, image_pointer_size_);
7882 if (resolved != nullptr) {
7885 const DexFile::FieldId& field_id = dex_file.GetFieldId(field_idx);
7886 Thread* self = Thread::Current();
7887 StackHandleScope<1> hs(self);
7888 Handle<mirror::Class> klass(
7889 hs.NewHandle(ResolveType(dex_file, field_id.class_idx_, dex_cache, class_loader)));
7890 if (klass.Get() == nullptr) {
7891 DCHECK(Thread::Current()->IsExceptionPending());
7895 StringPiece name(dex_file.StringDataByIdx(field_id.name_idx_));
7896 StringPiece type(dex_file.StringDataByIdx(
7897 dex_file.GetTypeId(field_id.type_idx_).descriptor_idx_));
7898 resolved = mirror::Class::FindField(self, klass, name, type);
7899 if (resolved != nullptr) {
7900 dex_cache->SetResolvedField(field_idx, resolved, image_pointer_size_);
7902 ThrowNoSuchFieldError("", klass.Get(), type, name);
7907 const char* ClassLinker::MethodShorty(uint32_t method_idx,
7908 ArtMethod* referrer,
7910 mirror::Class* declaring_class = referrer->GetDeclaringClass();
7911 mirror::DexCache* dex_cache = declaring_class->GetDexCache();
7912 const DexFile& dex_file = *dex_cache->GetDexFile();
7913 const DexFile::MethodId& method_id = dex_file.GetMethodId(method_idx);
7914 return dex_file.GetMethodShorty(method_id, length);
7917 class DumpClassVisitor : public ClassVisitor {
7919 explicit DumpClassVisitor(int flags) : flags_(flags) {}
7921 bool operator()(mirror::Class* klass) OVERRIDE SHARED_REQUIRES(Locks::mutator_lock_) {
7922 klass->DumpClass(LOG(ERROR), flags_);
7930 void ClassLinker::DumpAllClasses(int flags) {
7931 DumpClassVisitor visitor(flags);
7932 VisitClasses(&visitor);
7935 static OatFile::OatMethod CreateOatMethod(const void* code) {
7936 CHECK(code != nullptr);
7937 const uint8_t* base = reinterpret_cast<const uint8_t*>(code); // Base of data points at code.
7938 base -= sizeof(void*); // Move backward so that code_offset != 0.
7939 const uint32_t code_offset = sizeof(void*);
7940 return OatFile::OatMethod(base, code_offset);
7943 bool ClassLinker::IsQuickResolutionStub(const void* entry_point) const {
7944 return (entry_point == GetQuickResolutionStub()) ||
7945 (quick_resolution_trampoline_ == entry_point);
7948 bool ClassLinker::IsQuickToInterpreterBridge(const void* entry_point) const {
7949 return (entry_point == GetQuickToInterpreterBridge()) ||
7950 (quick_to_interpreter_bridge_trampoline_ == entry_point);
7953 bool ClassLinker::IsQuickGenericJniStub(const void* entry_point) const {
7954 return (entry_point == GetQuickGenericJniStub()) ||
7955 (quick_generic_jni_trampoline_ == entry_point);
7958 const void* ClassLinker::GetRuntimeQuickGenericJniStub() const {
7959 return GetQuickGenericJniStub();
7962 void ClassLinker::SetEntryPointsToCompiledCode(ArtMethod* method,
7963 const void* method_code) const {
7964 OatFile::OatMethod oat_method = CreateOatMethod(method_code);
7965 oat_method.LinkMethod(method);
7968 void ClassLinker::SetEntryPointsToInterpreter(ArtMethod* method) const {
7969 if (!method->IsNative()) {
7970 method->SetEntryPointFromQuickCompiledCode(GetQuickToInterpreterBridge());
7972 const void* quick_method_code = GetQuickGenericJniStub();
7973 OatFile::OatMethod oat_method = CreateOatMethod(quick_method_code);
7974 oat_method.LinkMethod(method);
7978 void ClassLinker::DumpForSigQuit(std::ostream& os) {
7979 ScopedObjectAccess soa(Thread::Current());
7980 if (dex_cache_boot_image_class_lookup_required_) {
7981 AddBootImageClassesToClassTable();
7983 ReaderMutexLock mu(soa.Self(), *Locks::classlinker_classes_lock_);
7984 os << "Zygote loaded classes=" << NumZygoteClasses() << " post zygote classes="
7985 << NumNonZygoteClasses() << "\n";
7988 class CountClassesVisitor : public ClassLoaderVisitor {
7990 CountClassesVisitor() : num_zygote_classes(0), num_non_zygote_classes(0) {}
7992 void Visit(mirror::ClassLoader* class_loader)
7993 SHARED_REQUIRES(Locks::classlinker_classes_lock_, Locks::mutator_lock_) OVERRIDE {
7994 ClassTable* const class_table = class_loader->GetClassTable();
7995 if (class_table != nullptr) {
7996 num_zygote_classes += class_table->NumZygoteClasses();
7997 num_non_zygote_classes += class_table->NumNonZygoteClasses();
8001 size_t num_zygote_classes;
8002 size_t num_non_zygote_classes;
8005 size_t ClassLinker::NumZygoteClasses() const {
8006 CountClassesVisitor visitor;
8007 VisitClassLoaders(&visitor);
8008 return visitor.num_zygote_classes + boot_class_table_.NumZygoteClasses();
8011 size_t ClassLinker::NumNonZygoteClasses() const {
8012 CountClassesVisitor visitor;
8013 VisitClassLoaders(&visitor);
8014 return visitor.num_non_zygote_classes + boot_class_table_.NumNonZygoteClasses();
8017 size_t ClassLinker::NumLoadedClasses() {
8018 if (dex_cache_boot_image_class_lookup_required_) {
8019 AddBootImageClassesToClassTable();
8021 ReaderMutexLock mu(Thread::Current(), *Locks::classlinker_classes_lock_);
8022 // Only return non zygote classes since these are the ones which apps which care about.
8023 return NumNonZygoteClasses();
8026 pid_t ClassLinker::GetClassesLockOwner() {
8027 return Locks::classlinker_classes_lock_->GetExclusiveOwnerTid();
8030 pid_t ClassLinker::GetDexLockOwner() {
8031 return dex_lock_.GetExclusiveOwnerTid();
8034 void ClassLinker::SetClassRoot(ClassRoot class_root, mirror::Class* klass) {
8035 DCHECK(!init_done_);
8037 DCHECK(klass != nullptr);
8038 DCHECK(klass->GetClassLoader() == nullptr);
8040 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read();
8041 DCHECK(class_roots != nullptr);
8042 DCHECK(class_roots->Get(class_root) == nullptr);
8043 class_roots->Set<false>(class_root, klass);
8046 const char* ClassLinker::GetClassRootDescriptor(ClassRoot class_root) {
8047 static const char* class_roots_descriptors[] = {
8048 "Ljava/lang/Class;",
8049 "Ljava/lang/Object;",
8050 "[Ljava/lang/Class;",
8051 "[Ljava/lang/Object;",
8052 "Ljava/lang/String;",
8053 "Ljava/lang/DexCache;",
8054 "Ljava/lang/ref/Reference;",
8055 "Ljava/lang/reflect/Constructor;",
8056 "Ljava/lang/reflect/Field;",
8057 "Ljava/lang/reflect/Method;",
8058 "Ljava/lang/reflect/Proxy;",
8059 "[Ljava/lang/String;",
8060 "[Ljava/lang/reflect/Constructor;",
8061 "[Ljava/lang/reflect/Field;",
8062 "[Ljava/lang/reflect/Method;",
8063 "Ljava/lang/ClassLoader;",
8064 "Ljava/lang/Throwable;",
8065 "Ljava/lang/ClassNotFoundException;",
8066 "Ljava/lang/StackTraceElement;",
8084 "[Ljava/lang/StackTraceElement;",
8086 static_assert(arraysize(class_roots_descriptors) == size_t(kClassRootsMax),
8087 "Mismatch between class descriptors and class-root enum");
8089 const char* descriptor = class_roots_descriptors[class_root];
8090 CHECK(descriptor != nullptr);
8094 jobject ClassLinker::CreatePathClassLoader(Thread* self,
8095 const std::vector<const DexFile*>& dex_files) {
8096 // SOAAlreadyRunnable is protected, and we need something to add a global reference.
8097 // We could move the jobject to the callers, but all call-sites do this...
8098 ScopedObjectAccessUnchecked soa(self);
8100 // For now, create a libcore-level DexFile for each ART DexFile. This "explodes" multidex.
8101 StackHandleScope<10> hs(self);
8103 ArtField* dex_elements_field =
8104 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList_dexElements);
8106 mirror::Class* dex_elements_class = dex_elements_field->GetType<true>();
8107 DCHECK(dex_elements_class != nullptr);
8108 DCHECK(dex_elements_class->IsArrayClass());
8109 Handle<mirror::ObjectArray<mirror::Object>> h_dex_elements(hs.NewHandle(
8110 mirror::ObjectArray<mirror::Object>::Alloc(self, dex_elements_class, dex_files.size())));
8111 Handle<mirror::Class> h_dex_element_class =
8112 hs.NewHandle(dex_elements_class->GetComponentType());
8114 ArtField* element_file_field =
8115 soa.DecodeField(WellKnownClasses::dalvik_system_DexPathList__Element_dexFile);
8116 DCHECK_EQ(h_dex_element_class.Get(), element_file_field->GetDeclaringClass());
8118 ArtField* cookie_field = soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_cookie);
8119 DCHECK_EQ(cookie_field->GetDeclaringClass(), element_file_field->GetType<false>());
8121 ArtField* file_name_field = soa.DecodeField(WellKnownClasses::dalvik_system_DexFile_fileName);
8122 DCHECK_EQ(file_name_field->GetDeclaringClass(), element_file_field->GetType<false>());
8124 // Fill the elements array.
8126 for (const DexFile* dex_file : dex_files) {
8127 StackHandleScope<4> hs2(self);
8129 // CreatePathClassLoader is only used by gtests. Index 0 of h_long_array is supposed to be the
8130 // oat file but we can leave it null.
8131 Handle<mirror::LongArray> h_long_array = hs2.NewHandle(mirror::LongArray::Alloc(
8133 kDexFileIndexStart + 1));
8134 DCHECK(h_long_array.Get() != nullptr);
8135 h_long_array->Set(kDexFileIndexStart, reinterpret_cast<intptr_t>(dex_file));
8137 Handle<mirror::Object> h_dex_file = hs2.NewHandle(
8138 cookie_field->GetDeclaringClass()->AllocObject(self));
8139 DCHECK(h_dex_file.Get() != nullptr);
8140 cookie_field->SetObject<false>(h_dex_file.Get(), h_long_array.Get());
8142 Handle<mirror::String> h_file_name = hs2.NewHandle(
8143 mirror::String::AllocFromModifiedUtf8(self, dex_file->GetLocation().c_str()));
8144 DCHECK(h_file_name.Get() != nullptr);
8145 file_name_field->SetObject<false>(h_dex_file.Get(), h_file_name.Get());
8147 Handle<mirror::Object> h_element = hs2.NewHandle(h_dex_element_class->AllocObject(self));
8148 DCHECK(h_element.Get() != nullptr);
8149 element_file_field->SetObject<false>(h_element.Get(), h_dex_file.Get());
8151 h_dex_elements->Set(index, h_element.Get());
8154 DCHECK_EQ(index, h_dex_elements->GetLength());
8156 // Create DexPathList.
8157 Handle<mirror::Object> h_dex_path_list = hs.NewHandle(
8158 dex_elements_field->GetDeclaringClass()->AllocObject(self));
8159 DCHECK(h_dex_path_list.Get() != nullptr);
8161 dex_elements_field->SetObject<false>(h_dex_path_list.Get(), h_dex_elements.Get());
8163 // Create PathClassLoader.
8164 Handle<mirror::Class> h_path_class_class = hs.NewHandle(
8165 soa.Decode<mirror::Class*>(WellKnownClasses::dalvik_system_PathClassLoader));
8166 Handle<mirror::Object> h_path_class_loader = hs.NewHandle(
8167 h_path_class_class->AllocObject(self));
8168 DCHECK(h_path_class_loader.Get() != nullptr);
8170 ArtField* path_list_field =
8171 soa.DecodeField(WellKnownClasses::dalvik_system_PathClassLoader_pathList);
8172 DCHECK(path_list_field != nullptr);
8173 path_list_field->SetObject<false>(h_path_class_loader.Get(), h_dex_path_list.Get());
8175 // Make a pretend boot-classpath.
8176 // TODO: Should we scan the image?
8177 ArtField* const parent_field =
8178 mirror::Class::FindField(self, hs.NewHandle(h_path_class_loader->GetClass()), "parent",
8179 "Ljava/lang/ClassLoader;");
8180 DCHECK(parent_field != nullptr);
8181 mirror::Object* boot_cl =
8182 soa.Decode<mirror::Class*>(WellKnownClasses::java_lang_BootClassLoader)->AllocObject(self);
8183 parent_field->SetObject<false>(h_path_class_loader.Get(), boot_cl);
8185 // Make it a global ref and return.
8186 ScopedLocalRef<jobject> local_ref(
8187 soa.Env(), soa.Env()->AddLocalReference<jobject>(h_path_class_loader.Get()));
8188 return soa.Env()->NewGlobalRef(local_ref.get());
8191 ArtMethod* ClassLinker::CreateRuntimeMethod(LinearAlloc* linear_alloc) {
8192 const size_t method_alignment = ArtMethod::Alignment(image_pointer_size_);
8193 const size_t method_size = ArtMethod::Size(image_pointer_size_);
8194 LengthPrefixedArray<ArtMethod>* method_array = AllocArtMethodArray(
8198 ArtMethod* method = &method_array->At(0, method_size, method_alignment);
8199 CHECK(method != nullptr);
8200 method->SetDexMethodIndex(DexFile::kDexNoIndex);
8201 CHECK(method->IsRuntimeMethod());
8205 void ClassLinker::DropFindArrayClassCache() {
8206 std::fill_n(find_array_class_cache_, kFindArrayCacheSize, GcRoot<mirror::Class>(nullptr));
8207 find_array_class_cache_next_victim_ = 0;
8210 void ClassLinker::ClearClassTableStrongRoots() const {
8211 Thread* const self = Thread::Current();
8212 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
8213 for (const ClassLoaderData& data : class_loaders_) {
8214 if (data.class_table != nullptr) {
8215 data.class_table->ClearStrongRoots();
8220 void ClassLinker::VisitClassLoaders(ClassLoaderVisitor* visitor) const {
8221 Thread* const self = Thread::Current();
8222 for (const ClassLoaderData& data : class_loaders_) {
8223 // Need to use DecodeJObject so that we get null for cleared JNI weak globals.
8224 auto* const class_loader = down_cast<mirror::ClassLoader*>(self->DecodeJObject(data.weak_root));
8225 if (class_loader != nullptr) {
8226 visitor->Visit(class_loader);
8231 void ClassLinker::InsertDexFileInToClassLoader(mirror::Object* dex_file,
8232 mirror::ClassLoader* class_loader) {
8233 DCHECK(dex_file != nullptr);
8234 Thread* const self = Thread::Current();
8235 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
8236 ClassTable* const table = ClassTableForClassLoader(class_loader);
8237 DCHECK(table != nullptr);
8238 if (table->InsertStrongRoot(dex_file) && class_loader != nullptr) {
8239 // It was not already inserted, perform the write barrier to let the GC know the class loader's
8240 // class table was modified.
8241 Runtime::Current()->GetHeap()->WriteBarrierEveryFieldOf(class_loader);
8245 void ClassLinker::CleanupClassLoaders() {
8246 Thread* const self = Thread::Current();
8247 std::vector<ClassLoaderData> to_delete;
8248 // Do the delete outside the lock to avoid lock violation in jit code cache.
8250 WriterMutexLock mu(self, *Locks::classlinker_classes_lock_);
8251 for (auto it = class_loaders_.begin(); it != class_loaders_.end(); ) {
8252 const ClassLoaderData& data = *it;
8253 // Need to use DecodeJObject so that we get null for cleared JNI weak globals.
8254 auto* const class_loader =
8255 down_cast<mirror::ClassLoader*>(self->DecodeJObject(data.weak_root));
8256 if (class_loader != nullptr) {
8259 VLOG(class_linker) << "Freeing class loader";
8260 to_delete.push_back(data);
8261 it = class_loaders_.erase(it);
8265 for (ClassLoaderData& data : to_delete) {
8266 DeleteClassLoader(self, data);
8270 std::set<DexCacheResolvedClasses> ClassLinker::GetResolvedClasses(bool ignore_boot_classes) {
8271 ScopedTrace trace(__PRETTY_FUNCTION__);
8272 ScopedObjectAccess soa(Thread::Current());
8273 ScopedAssertNoThreadSuspension ants(soa.Self(), __FUNCTION__);
8274 std::set<DexCacheResolvedClasses> ret;
8275 VLOG(class_linker) << "Collecting resolved classes";
8276 const uint64_t start_time = NanoTime();
8277 ReaderMutexLock mu(soa.Self(), *DexLock());
8278 // Loop through all the dex caches and inspect resolved classes.
8279 for (const ClassLinker::DexCacheData& data : GetDexCachesData()) {
8280 if (soa.Self()->IsJWeakCleared(data.weak_root)) {
8283 mirror::DexCache* dex_cache =
8284 down_cast<mirror::DexCache*>(soa.Self()->DecodeJObject(data.weak_root));
8285 if (dex_cache == nullptr) {
8288 const DexFile* dex_file = dex_cache->GetDexFile();
8289 const std::string& location = dex_file->GetLocation();
8290 const size_t num_class_defs = dex_file->NumClassDefs();
8291 // Use the resolved types, this will miss array classes.
8292 const size_t num_types = dex_file->NumTypeIds();
8293 VLOG(class_linker) << "Collecting class profile for dex file " << location
8294 << " types=" << num_types << " class_defs=" << num_class_defs;
8295 DexCacheResolvedClasses resolved_classes(dex_file->GetLocation(),
8296 dex_file->GetBaseLocation(),
8297 dex_file->GetLocationChecksum());
8298 size_t num_resolved = 0;
8299 std::unordered_set<uint16_t> class_set;
8300 CHECK_EQ(num_types, dex_cache->NumResolvedTypes());
8301 for (size_t i = 0; i < num_types; ++i) {
8302 mirror::Class* klass = dex_cache->GetResolvedType(i);
8303 // Filter out null class loader since that is the boot class loader.
8304 if (klass == nullptr || (ignore_boot_classes && klass->GetClassLoader() == nullptr)) {
8308 DCHECK(!klass->IsProxyClass());
8309 if (!klass->IsResolved()) {
8310 DCHECK(klass->IsErroneous());
8313 mirror::DexCache* klass_dex_cache = klass->GetDexCache();
8314 if (klass_dex_cache == dex_cache) {
8315 const size_t class_def_idx = klass->GetDexClassDefIndex();
8316 DCHECK(klass->IsResolved());
8317 CHECK_LT(class_def_idx, num_class_defs);
8318 class_set.insert(class_def_idx);
8322 if (!class_set.empty()) {
8323 auto it = ret.find(resolved_classes);
8324 if (it != ret.end()) {
8325 // Already have the key, union the class def idxs.
8326 it->AddClasses(class_set.begin(), class_set.end());
8328 resolved_classes.AddClasses(class_set.begin(), class_set.end());
8329 ret.insert(resolved_classes);
8333 VLOG(class_linker) << "Dex location " << location << " has " << num_resolved << " / "
8334 << num_class_defs << " resolved classes";
8336 VLOG(class_linker) << "Collecting class profile took " << PrettyDuration(NanoTime() - start_time);
8340 std::unordered_set<std::string> ClassLinker::GetClassDescriptorsForProfileKeys(
8341 const std::set<DexCacheResolvedClasses>& classes) {
8342 ScopedTrace trace(__PRETTY_FUNCTION__);
8343 std::unordered_set<std::string> ret;
8344 Thread* const self = Thread::Current();
8345 std::unordered_map<std::string, const DexFile*> location_to_dex_file;
8346 ScopedObjectAccess soa(self);
8347 ScopedAssertNoThreadSuspension ants(soa.Self(), __FUNCTION__);
8348 ReaderMutexLock mu(self, *DexLock());
8349 for (const ClassLinker::DexCacheData& data : GetDexCachesData()) {
8350 if (!self->IsJWeakCleared(data.weak_root)) {
8351 mirror::DexCache* dex_cache =
8352 down_cast<mirror::DexCache*>(soa.Self()->DecodeJObject(data.weak_root));
8353 if (dex_cache != nullptr) {
8354 const DexFile* dex_file = dex_cache->GetDexFile();
8355 // There could be duplicates if two dex files with the same location are mapped.
8356 location_to_dex_file.emplace(
8357 ProfileCompilationInfo::GetProfileDexFileKey(dex_file->GetLocation()), dex_file);
8361 for (const DexCacheResolvedClasses& info : classes) {
8362 const std::string& profile_key = info.GetDexLocation();
8363 auto found = location_to_dex_file.find(profile_key);
8364 if (found != location_to_dex_file.end()) {
8365 const DexFile* dex_file = found->second;
8366 VLOG(profiler) << "Found opened dex file for " << dex_file->GetLocation() << " with "
8367 << info.GetClasses().size() << " classes";
8368 DCHECK_EQ(dex_file->GetLocationChecksum(), info.GetLocationChecksum());
8369 for (uint16_t class_def_idx : info.GetClasses()) {
8370 if (class_def_idx >= dex_file->NumClassDefs()) {
8371 LOG(WARNING) << "Class def index " << class_def_idx << " >= " << dex_file->NumClassDefs();
8374 const DexFile::TypeId& type_id = dex_file->GetTypeId(
8375 dex_file->GetClassDef(class_def_idx).class_idx_);
8376 const char* descriptor = dex_file->GetTypeDescriptor(type_id);
8377 ret.insert(descriptor);
8380 VLOG(class_linker) << "Failed to find opened dex file for profile key " << profile_key;
8386 class ClassLinker::FindVirtualMethodHolderVisitor : public ClassVisitor {
8388 FindVirtualMethodHolderVisitor(const ArtMethod* method, size_t pointer_size)
8390 pointer_size_(pointer_size) {}
8392 bool operator()(mirror::Class* klass) SHARED_REQUIRES(Locks::mutator_lock_) OVERRIDE {
8393 if (klass->GetVirtualMethodsSliceUnchecked(pointer_size_).Contains(method_)) {
8396 // Return false to stop searching if holder_ is not null.
8397 return holder_ == nullptr;
8400 mirror::Class* holder_ = nullptr;
8401 const ArtMethod* const method_;
8402 const size_t pointer_size_;
8405 mirror::Class* ClassLinker::GetHoldingClassOfCopiedMethod(ArtMethod* method) {
8406 ScopedTrace trace(__FUNCTION__); // Since this function is slow, have a trace to notify people.
8407 CHECK(method->IsCopied());
8408 FindVirtualMethodHolderVisitor visitor(method, image_pointer_size_);
8409 VisitClasses(&visitor);
8410 return visitor.holder_;
8413 // Instantiate ResolveMethod.
8414 template ArtMethod* ClassLinker::ResolveMethod<ClassLinker::kForceICCECheck>(
8415 const DexFile& dex_file,
8416 uint32_t method_idx,
8417 Handle<mirror::DexCache> dex_cache,
8418 Handle<mirror::ClassLoader> class_loader,
8419 ArtMethod* referrer,
8421 template ArtMethod* ClassLinker::ResolveMethod<ClassLinker::kNoICCECheckForCache>(
8422 const DexFile& dex_file,
8423 uint32_t method_idx,
8424 Handle<mirror::DexCache> dex_cache,
8425 Handle<mirror::ClassLoader> class_loader,
8426 ArtMethod* referrer,