1 // prims.cc - Code for core of runtime environment.
3 /* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation
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
13 #ifdef USE_WIN32_SIGNALLING
15 #endif /* USE_WIN32_SIGNALLING */
18 #undef __INSIDE_CYGWIN__
20 #endif /* USE_WINSOCK */
34 #include <java-signal.h>
35 #include <java-threads.h>
41 #ifndef DISABLE_GETENV_PROPERTIES
43 #include <java-props.h>
44 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
46 #define PROCESS_GCJ_PROPERTIES
47 #endif // DISABLE_GETENV_PROPERTIES
49 #include <java/lang/Class.h>
50 #include <java/lang/ClassLoader.h>
51 #include <java/lang/Runtime.h>
52 #include <java/lang/String.h>
53 #include <java/lang/Thread.h>
54 #include <java/lang/ThreadGroup.h>
55 #include <gnu/gcj/runtime/FirstThread.h>
56 #include <java/lang/ArrayIndexOutOfBoundsException.h>
57 #include <java/lang/ArithmeticException.h>
58 #include <java/lang/ClassFormatError.h>
59 #include <java/lang/NegativeArraySizeException.h>
60 #include <java/lang/NullPointerException.h>
61 #include <java/lang/OutOfMemoryError.h>
62 #include <java/lang/System.h>
63 #include <java/lang/reflect/Modifier.h>
64 #include <java/io/PrintStream.h>
70 // We allocate a single OutOfMemoryError exception which we keep
71 // around for use if we run out of memory.
72 static java::lang::OutOfMemoryError *no_memory;
74 // Largest representable size_t.
75 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
77 // Properties set at compile time.
78 const char **_Jv_Compiler_Properties;
80 // The JAR file to add to the beginning of java.class.path.
81 const char *_Jv_Jar_Class_Path;
83 #ifndef DISABLE_GETENV_PROPERTIES
84 // Property key/value pairs.
85 property_pair *_Jv_Environment_Properties;
88 // The name of this executable.
89 static char * _Jv_execName;
91 // Stash the argv pointer to benefit native libraries that need it.
92 const char **_Jv_argv;
96 // Pointer to JVMPI notification functions.
97 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
98 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
99 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
103 extern "C" void _Jv_ThrowSignal (jthrowable) __attribute ((noreturn));
105 // Just like _Jv_Throw, but fill in the stack trace first. Although
106 // this is declared extern in order that its name not be mangled, it
107 // is not intended to be used outside this file.
109 _Jv_ThrowSignal (jthrowable throwable)
111 throwable->fillInStackTrace ();
116 static java::lang::NullPointerException *nullp;
118 SIGNAL_HANDLER (catch_segv)
120 MAKE_THROW_FRAME (nullp);
121 _Jv_ThrowSignal (nullp);
125 static java::lang::ArithmeticException *arithexception;
128 SIGNAL_HANDLER (catch_fpe)
130 #ifdef HANDLE_DIVIDE_OVERFLOW
131 HANDLE_DIVIDE_OVERFLOW;
133 MAKE_THROW_FRAME (arithexception);
135 _Jv_ThrowSignal (arithexception);
142 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
145 _Jv_ushort *aptr, *bptr;
148 if (a->hash != b->hash)
151 if (b->length != len)
153 aptr = (_Jv_ushort *)a->data;
154 bptr = (_Jv_ushort *)b->data;
155 len = (len + 1) >> 1;
157 if (*aptr++ != *bptr++)
162 /* True iff A is equal to STR.
163 HASH is STR->hashCode().
167 _Jv_equal (Utf8Const* a, jstring str, jint hash)
169 if (a->hash != (_Jv_ushort) hash)
171 jint len = str->length();
173 jchar *sptr = _Jv_GetStringChars (str);
174 unsigned char* ptr = (unsigned char*) a->data;
175 unsigned char* limit = ptr + a->length;
178 int ch = UTF8_GET (ptr, limit);
187 /* Like _Jv_equal, but stop after N characters. */
189 _Jv_equaln (Utf8Const *a, jstring str, jint n)
191 jint len = str->length();
193 jchar *sptr = _Jv_GetStringChars (str);
194 unsigned char* ptr = (unsigned char*) a->data;
195 unsigned char* limit = ptr + a->length;
196 for (; n-- > 0; i++, sptr++)
198 int ch = UTF8_GET (ptr, limit);
207 /* Count the number of Unicode chars encoded in a given Ut8 string. */
209 _Jv_strLengthUtf8(char* str, int len)
212 unsigned char* limit;
215 ptr = (unsigned char*) str;
218 for (; ptr < limit; str_length++) {
219 if (UTF8_GET (ptr, limit) < 0) {
226 /* Calculate a hash value for a string encoded in Utf8 format.
227 * This returns the same hash value as specified or java.lang.String.hashCode.
230 hashUtf8String (char* str, int len)
232 unsigned char* ptr = (unsigned char*) str;
233 unsigned char* limit = ptr + len;
238 int ch = UTF8_GET (ptr, limit);
239 /* Updated specification from
240 http://www.javasoft.com/docs/books/jls/clarify.html. */
241 hash = (31 * hash) + ch;
247 _Jv_makeUtf8Const (char* s, int len)
251 Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
254 memcpy (m->data, s, len);
257 m->hash = hashUtf8String (s, len) & 0xFFFF;
262 _Jv_makeUtf8Const (jstring string)
264 jint hash = string->hashCode ();
265 jint len = _Jv_GetStringUTFLength (string);
267 Utf8Const* m = (Utf8Const*)
268 _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
273 _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
283 _Jv_Abort (const char *function, const char *file, int line,
287 _Jv_Abort (const char *, const char *, int, const char *message)
292 "libgcj failure: %s\n in function %s, file %s, line %d\n",
293 message, function, file, line);
295 java::io::PrintStream *err = java::lang::System::err;
296 err->print(JvNewStringLatin1 ("libgcj failure: "));
297 err->println(JvNewStringLatin1 (message));
304 fail_on_finalization (jobject)
306 JvFail ("object was finalized");
310 _Jv_GCWatch (jobject obj)
312 _Jv_RegisterFinalizer (obj, fail_on_finalization);
316 _Jv_ThrowBadArrayIndex(jint bad_index)
318 throw new java::lang::ArrayIndexOutOfBoundsException
319 (java::lang::String::valueOf (bad_index));
323 _Jv_ThrowNullPointerException ()
325 throw new java::lang::NullPointerException;
328 // Allocate some unscanned memory and throw an exception if no memory.
330 _Jv_AllocBytesChecked (jsize size)
332 void *r = _Jv_AllocBytes (size);
338 // Allocate a new object of class KLASS. SIZE is the size of the object
339 // to allocate. You might think this is redundant, but it isn't; some
340 // classes, such as String, aren't of fixed size.
342 _Jv_AllocObject (jclass klass, jint size)
344 _Jv_InitClass (klass);
346 jobject obj = (jobject) _Jv_AllocObj (size, klass);
347 if (__builtin_expect (! obj, false))
350 // If this class has inherited finalize from Object, then don't
351 // bother registering a finalizer. We know that finalize() is the
352 // very first method after the dummy entry. If this turns out to be
353 // unreliable, a more robust implementation can be written. Such an
354 // implementation would look for Object.finalize in Object's method
355 // table at startup, and then use that information to find the
356 // appropriate index in the method vector.
357 if (klass->vtable->get_finalizer()
358 != java::lang::Object::class$.vtable->get_finalizer())
359 _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
362 // Service JVMPI request.
364 if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
368 event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
370 event.u.obj_alloc.arena_id = 0;
371 event.u.obj_alloc.class_id = (jobjectID) klass;
372 event.u.obj_alloc.is_array = 0;
373 event.u.obj_alloc.size = size;
374 event.u.obj_alloc.obj_id = (jobjectID) obj;
377 (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
385 // Allocate a new array of Java objects. Each object is of type
386 // `elementClass'. `init' is used to initialize each slot in the
389 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
391 if (__builtin_expect (count < 0, false))
392 throw new java::lang::NegativeArraySizeException;
394 JvAssert (! elementClass->isPrimitive ());
396 // Ensure that elements pointer is properly aligned.
397 jobjectArray obj = NULL;
398 size_t size = (size_t) elements (obj);
399 size += count * sizeof (jobject);
401 // FIXME: second argument should be "current loader"
402 jclass klass = _Jv_GetArrayClass (elementClass, 0);
404 obj = (jobjectArray) _Jv_AllocArray (size, klass);
405 if (__builtin_expect (! obj, false))
408 jsize *lp = const_cast<jsize *> (&obj->length);
410 // We know the allocator returns zeroed memory. So don't bother
414 jobject *ptr = elements(obj);
421 // Allocate a new array of primitives. ELTYPE is the type of the
422 // element, COUNT is the size of the array.
424 _Jv_NewPrimArray (jclass eltype, jint count)
426 int elsize = eltype->size();
427 if (__builtin_expect (count < 0, false))
428 throw new java::lang::NegativeArraySizeException;
430 JvAssert (eltype->isPrimitive ());
431 jobject dummy = NULL;
432 size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
434 // Check for overflow.
435 if (__builtin_expect ((size_t) count >
436 (SIZE_T_MAX - size) / elsize, false))
439 jclass klass = _Jv_GetArrayClass (eltype, 0);
441 __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
442 if (__builtin_expect (! arr, false))
445 jsize *lp = const_cast<jsize *> (&arr->length);
447 // Note that we assume we are given zeroed memory by the allocator.
453 _Jv_NewArray (jint type, jint size)
457 case 4: return JvNewBooleanArray (size);
458 case 5: return JvNewCharArray (size);
459 case 6: return JvNewFloatArray (size);
460 case 7: return JvNewDoubleArray (size);
461 case 8: return JvNewByteArray (size);
462 case 9: return JvNewShortArray (size);
463 case 10: return JvNewIntArray (size);
464 case 11: return JvNewLongArray (size);
466 JvFail ("newarray - bad type code");
467 return NULL; // Placate compiler.
471 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
473 JvAssert (type->isArray());
474 jclass element_type = type->getComponentType();
476 if (element_type->isPrimitive())
477 result = _Jv_NewPrimArray (element_type, sizes[0]);
479 result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
483 JvAssert (! element_type->isPrimitive());
484 JvAssert (element_type->isArray());
485 jobject *contents = elements ((jobjectArray) result);
486 for (int i = 0; i < sizes[0]; ++i)
487 contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
495 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
498 jint sizes[dimensions];
499 va_start (args, dimensions);
500 for (int i = 0; i < dimensions; ++i)
502 jint size = va_arg (args, jint);
507 return _Jv_NewMultiArray (array_type, dimensions, sizes);
512 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
513 _Jv_ArrayVTable _Jv_##NAME##VTable; \
514 java::lang::Class _Jv_##NAME##Class ((jobject) #NAME, \
515 (jbyte) SIG, (jint) LEN, \
516 (jobject) &_Jv_##NAME##VTable);
518 DECLARE_PRIM_TYPE(byte, 'B', 1);
519 DECLARE_PRIM_TYPE(short, 'S', 2);
520 DECLARE_PRIM_TYPE(int, 'I', 4);
521 DECLARE_PRIM_TYPE(long, 'J', 8);
522 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
523 DECLARE_PRIM_TYPE(char, 'C', 2);
524 DECLARE_PRIM_TYPE(float, 'F', 4);
525 DECLARE_PRIM_TYPE(double, 'D', 8);
526 DECLARE_PRIM_TYPE(void, 'V', 0);
529 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
534 return JvPrimClass (byte);
536 return JvPrimClass (short);
538 return JvPrimClass (int);
540 return JvPrimClass (long);
542 return JvPrimClass (boolean);
544 return JvPrimClass (char);
546 return JvPrimClass (float);
548 return JvPrimClass (double);
550 return JvPrimClass (void);
554 for (i = 1; sig[i] && sig[i] != ';'; ++i)
556 _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
557 return _Jv_FindClass (name, loader);
562 jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
565 return _Jv_GetArrayClass (klass, loader);
569 return NULL; // Placate compiler.
575 JvConvertArgv (int argc, const char **argv)
579 jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
580 jobject* ptr = elements(ar);
581 for (int i = 0; i < argc; i++)
583 const char *arg = argv[i];
584 // FIXME - should probably use JvNewStringUTF.
585 *ptr++ = JvNewStringLatin1(arg, strlen(arg));
587 return (JArray<jstring>*) ar;
590 // FIXME: These variables are static so that they will be
591 // automatically scanned by the Boehm collector. This is needed
592 // because with qthreads the collector won't scan the initial stack --
593 // it will only scan the qthreads stacks.
595 // Command line arguments.
596 static jobject arg_vec;
598 // The primary thread.
599 static java::lang::Thread *main_thread;
602 _Jv_ThisExecutable (void)
608 _Jv_ThisExecutable (const char *name)
612 _Jv_execName = new char[strlen (name) + 1];
613 strcpy (_Jv_execName, name);
617 #ifdef USE_WIN32_SIGNALLING
619 extern "C" int* win32_get_restart_frame (void *);
622 win32_exception_handler (LPEXCEPTION_POINTERS e)
625 if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
626 setjmp_buf = win32_get_restart_frame (nullp);
627 else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
628 setjmp_buf = win32_get_restart_frame (arithexception);
630 return EXCEPTION_CONTINUE_SEARCH;
632 e->ContextRecord->Ebp = setjmp_buf[0];
633 // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
634 e->ContextRecord->Eip = setjmp_buf[1];
635 // FIXME: Is this the stack pointer? Do we need it?
636 e->ContextRecord->Esp = setjmp_buf[2];
638 return EXCEPTION_CONTINUE_EXECUTION;
646 // Turn stack trace generation off while creating exception objects.
647 _Jv_InitClass (&java::lang::Throwable::class$);
648 java::lang::Throwable::trace_enabled = 0;
654 arithexception = new java::lang::ArithmeticException
655 (JvNewStringLatin1 ("/ by zero"));
658 no_memory = new java::lang::OutOfMemoryError;
660 java::lang::Throwable::trace_enabled = 1;
663 LTDL_SET_PRELOADED_SYMBOLS ();
667 // Initialise winsock for networking
669 if (WSAStartup (MAKEWORD (1, 1), &data))
670 MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
671 #endif /* USE_WINSOCK */
673 #ifdef USE_WIN32_SIGNALLING
674 // Install exception handler
675 SetUnhandledExceptionFilter (win32_exception_handler);
677 // We only want this on POSIX systems.
678 struct sigaction act;
679 act.sa_handler = SIG_IGN;
680 sigemptyset (&act.sa_mask);
682 sigaction (SIGPIPE, &act, NULL);
683 #endif /* USE_WIN32_SIGNALLING */
688 #ifndef DISABLE_GETENV_PROPERTIES
691 next_property_key (char *s, size_t *length)
697 // Skip over whitespace
701 // If we've reached the end, return NULL. Also return NULL if for
702 // some reason we've come across a malformed property string.
708 // Determine the length of the property key.
726 next_property_value (char *s, size_t *length)
742 // If we've reached the end, return NULL.
746 // Determine the length of the property value.
765 process_gcj_properties ()
767 char *props = getenv("GCJ_PROPERTIES");
770 size_t property_count = 0;
775 // Whip through props quickly in order to count the number of
777 while (p && (p = next_property_key (p, &length)))
779 // Skip to the end of the key
782 p = next_property_value (p, &length);
789 // Allocate an array of property value/key pairs.
790 _Jv_Environment_Properties =
791 (property_pair *) malloc (sizeof(property_pair)
792 * (property_count + 1));
794 // Go through the properties again, initializing _Jv_Properties
798 while (p && (p = next_property_key (p, &length)))
800 _Jv_Environment_Properties[property_count].key = p;
801 _Jv_Environment_Properties[property_count].key_length = length;
803 // Skip to the end of the key
806 p = next_property_value (p, &length);
808 _Jv_Environment_Properties[property_count].value = p;
809 _Jv_Environment_Properties[property_count].value_length = length;
816 memset ((void *) &_Jv_Environment_Properties[property_count],
817 0, sizeof (property_pair));
821 // Null terminate the strings.
822 while (_Jv_Environment_Properties[i].key)
824 _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
825 _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
829 #endif // DISABLE_GETENV_PROPERTIES
832 JvRunMain (jclass klass, int argc, const char **argv)
834 PROCESS_GCJ_PROPERTIES;
840 #ifdef HAVE_PROC_SELF_EXE
842 sprintf (exec_name, "/proc/%d/exe", getpid ());
843 _Jv_ThisExecutable (exec_name);
845 _Jv_ThisExecutable (argv[0]);
848 arg_vec = JvConvertArgv (argc - 1, argv + 1);
849 main_thread = new gnu::gcj::runtime::FirstThread (klass, arg_vec);
851 main_thread->start();
854 int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
856 java::lang::Runtime::getRuntime ()->_exit (status);
860 _Jv_RunMain (const char *name, int argc, const char **argv, bool is_jar)
863 PROCESS_GCJ_PROPERTIES;
867 #ifdef HAVE_PROC_SELF_EXE
869 sprintf (exec_name, "/proc/%d/exe", getpid ());
870 _Jv_ThisExecutable (exec_name);
875 // name specifies a jar file. We must now extract the
876 // Main-Class attribute from the jar's manifest file. This is
877 // done by gnu.gcj.runtime.FirstThread.main.
878 _Jv_Jar_Class_Path = strdup (name);
879 arg_vec = JvConvertArgv (1, &_Jv_Jar_Class_Path);
882 new gnu::gcj::runtime::FirstThread (&gnu::gcj::runtime::FirstThread::class$,
884 main_thread->start();
887 // FirstThread.main extracts the main class name and stores it
889 class_name = gnu::gcj::runtime::FirstThread::jarMainClassName;
891 // We need a new ClassLoader because the classpath must be the
892 // jar file only. The easiest way to do this is to lose our
893 // reference to the previous classloader.
894 java::lang::ClassLoader::system = NULL;
897 class_name = JvNewStringLatin1 (name);
899 arg_vec = JvConvertArgv (argc - 1, argv + 1);
903 main_thread = new gnu::gcj::runtime::FirstThread (class_name, arg_vec);
904 main_thread->start();
908 int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
910 java::lang::Runtime::getRuntime ()->exit (status);
915 // Parse a string and return a heap size.
917 parse_heap_size (const char *spec)
920 unsigned long val = strtoul (spec, &end, 10);
921 if (*end == 'k' || *end == 'K')
923 else if (*end == 'm' || *end == 'M')
928 // Set the initial heap size. This might be ignored by the GC layer.
929 // This must be called before _Jv_RunMain.
931 _Jv_SetInitialHeapSize (const char *arg)
933 size_t size = parse_heap_size (arg);
934 _Jv_GCSetInitialHeapSize (size);
937 // Set the maximum heap size. This might be ignored by the GC layer.
938 // This must be called before _Jv_RunMain.
940 _Jv_SetMaximumHeapSize (const char *arg)
942 size_t size = parse_heap_size (arg);
943 _Jv_GCSetMaximumHeapSize (size);
949 _Jv_Malloc (jsize size)
951 if (__builtin_expect (size == 0, false))
953 void *ptr = malloc ((size_t) size);
954 if (__builtin_expect (ptr == NULL, false))
960 _Jv_Realloc (void *ptr, jsize size)
962 if (__builtin_expect (size == 0, false))
964 ptr = realloc (ptr, (size_t) size);
965 if (__builtin_expect (ptr == NULL, false))
971 _Jv_MallocUnchecked (jsize size)
973 if (__builtin_expect (size == 0, false))
975 return malloc ((size_t) size);
986 // In theory, these routines can be #ifdef'd away on machines which
987 // support divide overflow signals. However, we never know if some
988 // code might have been compiled with "-fuse-divide-subroutine", so we
989 // always include them in libgcj.
992 _Jv_divI (jint dividend, jint divisor)
994 if (__builtin_expect (divisor == 0, false))
995 _Jv_ThrowSignal (arithexception);
997 if (dividend == (jint) 0x80000000L && divisor == -1)
1000 return dividend / divisor;
1004 _Jv_remI (jint dividend, jint divisor)
1006 if (__builtin_expect (divisor == 0, false))
1007 _Jv_ThrowSignal (arithexception);
1009 if (dividend == (jint) 0x80000000L && divisor == -1)
1012 return dividend % divisor;
1016 _Jv_divJ (jlong dividend, jlong divisor)
1018 if (__builtin_expect (divisor == 0, false))
1019 _Jv_ThrowSignal (arithexception);
1021 if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1024 return dividend / divisor;
1028 _Jv_remJ (jlong dividend, jlong divisor)
1030 if (__builtin_expect (divisor == 0, false))
1031 _Jv_ThrowSignal (arithexception);
1033 if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1036 return dividend % divisor;