1 // prims.cc - Code for core of runtime environment.
3 /* Copyright (C) 1998, 1999 Cygnus Solutions
5 This file is part of libgcj.
7 This software is copyrighted work licensed under the terms of the
8 Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
21 #pragma implementation "java-array.h"
26 #include <java/lang/Class.h>
27 #include <java/lang/Runtime.h>
28 #include <java/lang/String.h>
29 #include <java/lang/Thread.h>
30 #include <java/lang/ThreadGroup.h>
31 #include <java/lang/FirstThread.h>
32 #include <java/lang/ArrayIndexOutOfBoundsException.h>
33 #include <java/lang/ClassFormatError.h>
34 #include <java/lang/ClassCastException.h>
35 #include <java/lang/NegativeArraySizeException.h>
36 #include <java/lang/NullPointerException.h>
37 #include <java/lang/OutOfMemoryError.h>
38 #include <java/lang/ArrayStoreException.h>
39 #include <java/lang/System.h>
40 #include <java/lang/reflect/Modifier.h>
41 #include <java/io/PrintStream.h>
43 #define ObjectClass _CL_Q34java4lang6Object
44 extern java::lang::Class ObjectClass;
46 // We allocate a single OutOfMemoryError exception which we keep
47 // around for use if we run out of memory.
48 static java::lang::OutOfMemoryError *no_memory;
50 // Largest representable size_t.
51 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
56 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
59 register _Jv_ushort *aptr, *bptr;
62 if (a->hash != b->hash)
67 aptr = (_Jv_ushort *)a->data;
68 bptr = (_Jv_ushort *)b->data;
71 if (*aptr++ != *bptr++)
76 /* True iff A is equal to STR.
77 HASH is STR->hashCode().
81 _Jv_equal (Utf8Const* a, jstring str, jint hash)
83 if (a->hash != (_Jv_ushort) hash)
85 jint len = str->length();
87 jchar *sptr = _Jv_GetStringChars (str);
88 register unsigned char* ptr = (unsigned char*) a->data;
89 register unsigned char* limit = ptr + a->length;
92 int ch = UTF8_GET (ptr, limit);
101 /* Count the number of Unicode chars encoded in a given Ut8 string. */
103 _Jv_strLengthUtf8(char* str, int len)
105 register unsigned char* ptr;
106 register unsigned char* limit;
109 ptr = (unsigned char*) str;
112 for (; ptr < limit; str_length++) {
113 if (UTF8_GET (ptr, limit) < 0) {
120 /* Calculate a hash value for a string encoded in Utf8 format.
121 * This returns the same hash value as specified or java.lang.String.hashCode.
124 hashUtf8String (char* str, int len)
126 register unsigned char* ptr = (unsigned char*) str;
127 register unsigned char* limit = ptr + len;
132 int ch = UTF8_GET (ptr, limit);
133 /* Updated specification from
134 http://www.javasoft.com/docs/books/jls/clarify.html. */
135 hash = (31 * hash) + ch;
141 _Jv_makeUtf8Const (char* s, int len)
145 Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
148 memcpy (m->data, s, len);
151 m->hash = hashUtf8String (s, len) & 0xFFFF;
159 _Jv_Abort (const char *function, const char *file, int line,
163 _Jv_Abort (const char *, const char *, int, const char *message)
168 "libgcj failure: %s\n in function %s, file %s, line %d\n",
169 message, function, file, line);
171 java::io::PrintStream *err = java::lang::System::err;
172 err->print(JvNewStringLatin1 ("libgcj failure: "));
173 err->println(JvNewStringLatin1 (message));
180 fail_on_finalization (jobject)
182 JvFail ("object was finalized");
186 _Jv_GCWatch (jobject obj)
188 _Jv_RegisterFinalizer (obj, fail_on_finalization);
192 _Jv_ThrowBadArrayIndex(jint bad_index)
194 JvThrow (new java::lang::ArrayIndexOutOfBoundsException
195 (java::lang::String::valueOf(bad_index)));
199 _Jv_CheckCast (jclass c, jobject obj)
201 if (obj != NULL && ! c->isAssignableFrom(obj->getClass()))
202 JvThrow (new java::lang::ClassCastException);
207 _Jv_CheckArrayStore (jobject arr, jobject obj)
211 JvAssert (arr != NULL);
212 jclass arr_class = arr->getClass();
213 JvAssert (arr_class->isArray());
214 jclass elt_class = arr_class->getComponentType();
215 jclass obj_class = obj->getClass();
216 if (! elt_class->isAssignableFrom(obj_class))
217 JvThrow (new java::lang::ArrayStoreException);
223 // Allocate some unscanned memory and throw an exception if no memory.
225 _Jv_AllocBytesChecked (jsize size)
227 void *r = _Jv_AllocBytes (size);
229 _Jv_Throw (no_memory);
233 // Allocate a new object of class C. SIZE is the size of the object
234 // to allocate. You might think this is redundant, but it isn't; some
235 // classes, such as String, aren't of fixed size.
237 _Jv_AllocObject (jclass c, jint size)
241 jobject obj = (jobject) _Jv_AllocObj (size);
244 *((_Jv_VTable **) obj) = c->vtable;
246 // If this class has inherited finalize from Object, then don't
247 // bother registering a finalizer. We know that finalize() is the
248 // very first method after the dummy entry. If this turns out to be
249 // unreliable, a more robust implementation can be written. Such an
250 // implementation would look for Object.finalize in Object's method
251 // table at startup, and then use that information to find the
252 // appropriate index in the method vector.
253 if (c->vtable->method[1] != ObjectClass.vtable->method[1])
254 _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
259 // Allocate a new array of Java objects. Each object is of type
260 // `elementClass'. `init' is used to initialize each slot in the
263 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
266 JvThrow (new java::lang::NegativeArraySizeException);
268 // Check for overflow.
269 if ((size_t) count > (SIZE_T_MAX - sizeof (__JArray)) / sizeof (jobject))
272 size_t size = count * sizeof (jobject) + sizeof (__JArray);
273 jclass clas = _Jv_FindArrayClass (elementClass);
274 jobjectArray obj = (jobjectArray) _Jv_AllocArray (size);
278 jobject* ptr = elements(obj);
279 // We know the allocator returns zeroed memory. So don't bother
286 // Set the vtbl last to avoid problems if the GC happens during the
287 // window in this function between the allocation and this
289 *((_Jv_VTable **) obj) = clas->vtable;
293 // Allocate a new array of primitives. ELTYPE is the type of the
294 // element, COUNT is the size of the array.
296 _Jv_NewPrimArray (jclass eltype, jint count)
298 int elsize = eltype->size();
300 JvThrow (new java::lang::NegativeArraySizeException ());
302 // Check for overflow.
303 if ((size_t) count > (SIZE_T_MAX - sizeof (__JArray)) / elsize)
306 __JArray *arr = (__JArray*) _Jv_AllocObj (sizeof (__JArray)
311 // Note that we assume we are given zeroed memory by the allocator.
313 jclass klass = _Jv_FindArrayClass (eltype);
314 // Set the vtbl last to avoid problems if the GC happens during the
315 // window in this function between the allocation and this
317 *((_Jv_VTable **) arr) = klass->vtable;
322 JvNewCharArray (jint length)
324 return (jcharArray) _Jv_NewPrimArray (JvPrimClass (char), length);
328 JvNewBooleanArray (jint length)
330 return (jbooleanArray) _Jv_NewPrimArray (JvPrimClass (boolean), length);
334 JvNewByteArray (jint length)
336 return (jbyteArray) _Jv_NewPrimArray (JvPrimClass (byte), length);
340 JvNewShortArray (jint length)
342 return (jshortArray) _Jv_NewPrimArray (JvPrimClass (short), length);
346 JvNewIntArray (jint length)
348 return (jintArray) _Jv_NewPrimArray (JvPrimClass (int), length);
352 JvNewLongArray (jint length)
354 return (jlongArray) _Jv_NewPrimArray (JvPrimClass (long), length);
358 JvNewFloatArray (jint length)
360 return (jfloatArray) _Jv_NewPrimArray (JvPrimClass (float), length);
364 JvNewDoubleArray (jint length)
366 return (jdoubleArray) _Jv_NewPrimArray (JvPrimClass (double), length);
370 _Jv_NewArray (jint type, jint size)
374 case 4: return JvNewBooleanArray (size);
375 case 5: return JvNewCharArray (size);
376 case 6: return JvNewFloatArray (size);
377 case 7: return JvNewDoubleArray (size);
378 case 8: return JvNewByteArray (size);
379 case 9: return JvNewShortArray (size);
380 case 10: return JvNewIntArray (size);
381 case 11: return JvNewLongArray (size);
383 JvFail ("newarray - bad type code");
384 return NULL; // Placate compiler.
388 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
390 JvAssert (type->isArray());
391 jclass element_type = type->getComponentType();
393 if (element_type->isPrimitive())
394 result = _Jv_NewPrimArray (element_type, sizes[0]);
396 result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
400 JvAssert (! element_type->isPrimitive());
401 JvAssert (element_type->isArray());
402 jobject *contents = elements ((jobjectArray) result);
403 for (int i = 0; i < sizes[0]; ++i)
404 contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
412 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
415 jint sizes[dimensions];
416 va_start (args, dimensions);
417 for (int i = 0; i < dimensions; ++i)
419 jint size = va_arg (args, jint);
424 return _Jv_NewMultiArray (array_type, dimensions, sizes);
431 static java::lang::NullPointerException *nullp;
436 // Don't run `new' in a signal handler, so we always throw the same
437 // null pointer exception.
441 #endif /* HANDLE_SEGV */
443 class _Jv_PrimClass : public java::lang::Class
446 // FIXME: calling convention is weird. If we use the natural types
447 // then the compiler will complain because they aren't Java types.
448 _Jv_PrimClass (jobject cname, jbyte sig, jint len)
450 using namespace java::lang::reflect;
452 // We must initialize every field of the class. We do this in
453 // the same order they are declared in Class.h.
455 name = _Jv_makeUtf8Const ((char *) cname, -1);
456 accflags = Modifier::PUBLIC | Modifier::FINAL;
459 constants.tags = NULL;
460 constants.data = NULL;
463 vtable_method_count = 0;
467 static_field_count = 0;
468 vtable = JV_PRIMITIVE_VTABLE;
477 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
478 _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN)
480 DECLARE_PRIM_TYPE(byte, 'B', 1);
481 DECLARE_PRIM_TYPE(short, 'S', 2);
482 DECLARE_PRIM_TYPE(int, 'I', 4);
483 DECLARE_PRIM_TYPE(long, 'J', 8);
484 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
485 DECLARE_PRIM_TYPE(char, 'C', 2);
486 DECLARE_PRIM_TYPE(float, 'F', 4);
487 DECLARE_PRIM_TYPE(double, 'D', 8);
488 DECLARE_PRIM_TYPE(void, 'V', 0);
491 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
496 return JvPrimClass (byte);
498 return JvPrimClass (short);
500 return JvPrimClass (int);
502 return JvPrimClass (long);
504 return JvPrimClass (boolean);
506 return JvPrimClass (char);
508 return JvPrimClass (float);
510 return JvPrimClass (double);
512 return JvPrimClass (void);
516 for (i = 1; sig[i] && sig[i] != ';'; ++i)
518 _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
519 return _Jv_FindClass (name, loader);
522 return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader));
524 JvFail ("couldn't understand class signature");
525 return NULL; // Placate compiler.
531 JvConvertArgv (int argc, const char **argv)
535 jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
536 jobject* ptr = elements(ar);
537 for (int i = 0; i < argc; i++)
539 const char *arg = argv[i];
540 // FIXME - should probably use JvNewStringUTF.
541 *ptr++ = JvNewStringLatin1(arg, strlen(arg));
543 return (JArray<jstring>*) ar;
546 // FIXME: These variables are static so that they will be
547 // automatically scanned by the Boehm collector. This is needed
548 // because with qthreads the collector won't scan the initial stack --
549 // it will only scan the qthreads stacks.
551 // Command line arguments.
552 static jobject arg_vec;
554 // The primary threadgroup.
555 static java::lang::ThreadGroup *main_group;
557 // The primary thread.
558 static java::lang::Thread *main_thread;
561 JvRunMain (jclass klass, int argc, const char **argv)
564 nullp = new java::lang::NullPointerException ();
566 struct sigaction act;
567 act.sa_handler = catch_segv;
568 sigemptyset (&act.sa_mask);
570 sigaction (SIGSEGV, &act, NULL);
573 no_memory = new java::lang::OutOfMemoryError;
575 arg_vec = JvConvertArgv (argc - 1, argv + 1);
576 main_group = new java::lang::ThreadGroup (23);
577 main_thread = new java::lang::FirstThread (main_group, klass, arg_vec);
579 main_thread->start();
582 java::lang::Runtime::getRuntime ()->exit (0);
588 _Jv_Malloc (jsize size)
592 void *ptr = malloc ((size_t) size);