1 // prims.cc - Code for core of runtime environment.
3 /* Copyright (C) 1998, 1999, 2000 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/Runtime.h>
51 #include <java/lang/String.h>
52 #include <java/lang/Thread.h>
53 #include <java/lang/ThreadGroup.h>
54 #include <gnu/gcj/runtime/FirstThread.h>
55 #include <java/lang/ArrayIndexOutOfBoundsException.h>
56 #include <java/lang/ArithmeticException.h>
57 #include <java/lang/ClassFormatError.h>
58 #include <java/lang/NegativeArraySizeException.h>
59 #include <java/lang/NullPointerException.h>
60 #include <java/lang/OutOfMemoryError.h>
61 #include <java/lang/System.h>
62 #include <java/lang/reflect/Modifier.h>
63 #include <java/io/PrintStream.h>
69 #define ObjectClass _CL_Q34java4lang6Object
70 extern java::lang::Class ObjectClass;
72 // We allocate a single OutOfMemoryError exception which we keep
73 // around for use if we run out of memory.
74 static java::lang::OutOfMemoryError *no_memory;
76 // Largest representable size_t.
77 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
79 // Properties set at compile time.
80 const char **_Jv_Compiler_Properties;
82 #ifndef DISABLE_GETENV_PROPERTIES
83 // Property key/value pairs.
84 property_pair *_Jv_Environment_Properties;
87 // The name of this executable.
88 static char * _Jv_execName;
91 // Pointer to JVMPI notification functions.
92 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
93 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
94 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
99 static java::lang::NullPointerException *nullp;
100 SIGNAL_HANDLER (catch_segv)
103 nullp->fillInStackTrace ();
108 static java::lang::ArithmeticException *arithexception;
111 SIGNAL_HANDLER (catch_fpe)
113 #ifdef HANDLE_DIVIDE_OVERFLOW
114 HANDLE_DIVIDE_OVERFLOW;
118 arithexception->fillInStackTrace ();
119 _Jv_Throw (arithexception);
126 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
129 register _Jv_ushort *aptr, *bptr;
132 if (a->hash != b->hash)
135 if (b->length != len)
137 aptr = (_Jv_ushort *)a->data;
138 bptr = (_Jv_ushort *)b->data;
139 len = (len + 1) >> 1;
141 if (*aptr++ != *bptr++)
146 /* True iff A is equal to STR.
147 HASH is STR->hashCode().
151 _Jv_equal (Utf8Const* a, jstring str, jint hash)
153 if (a->hash != (_Jv_ushort) hash)
155 jint len = str->length();
157 jchar *sptr = _Jv_GetStringChars (str);
158 register unsigned char* ptr = (unsigned char*) a->data;
159 register unsigned char* limit = ptr + a->length;
162 int ch = UTF8_GET (ptr, limit);
171 /* Like _Jv_equal, but stop after N characters. */
173 _Jv_equaln (Utf8Const *a, jstring str, jint n)
175 jint len = str->length();
177 jchar *sptr = _Jv_GetStringChars (str);
178 register unsigned char* ptr = (unsigned char*) a->data;
179 register unsigned char* limit = ptr + a->length;
180 for (; n-- > 0; i++, sptr++)
182 int ch = UTF8_GET (ptr, limit);
191 /* Count the number of Unicode chars encoded in a given Ut8 string. */
193 _Jv_strLengthUtf8(char* str, int len)
195 register unsigned char* ptr;
196 register unsigned char* limit;
199 ptr = (unsigned char*) str;
202 for (; ptr < limit; str_length++) {
203 if (UTF8_GET (ptr, limit) < 0) {
210 /* Calculate a hash value for a string encoded in Utf8 format.
211 * This returns the same hash value as specified or java.lang.String.hashCode.
214 hashUtf8String (char* str, int len)
216 register unsigned char* ptr = (unsigned char*) str;
217 register unsigned char* limit = ptr + len;
222 int ch = UTF8_GET (ptr, limit);
223 /* Updated specification from
224 http://www.javasoft.com/docs/books/jls/clarify.html. */
225 hash = (31 * hash) + ch;
231 _Jv_makeUtf8Const (char* s, int len)
235 Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
238 memcpy (m->data, s, len);
241 m->hash = hashUtf8String (s, len) & 0xFFFF;
246 _Jv_makeUtf8Const (jstring string)
248 jint hash = string->hashCode ();
249 jint len = _Jv_GetStringUTFLength (string);
251 Utf8Const* m = (Utf8Const*)
252 _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
257 _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
267 _Jv_Abort (const char *function, const char *file, int line,
271 _Jv_Abort (const char *, const char *, int, const char *message)
276 "libgcj failure: %s\n in function %s, file %s, line %d\n",
277 message, function, file, line);
279 java::io::PrintStream *err = java::lang::System::err;
280 err->print(JvNewStringLatin1 ("libgcj failure: "));
281 err->println(JvNewStringLatin1 (message));
288 fail_on_finalization (jobject)
290 JvFail ("object was finalized");
294 _Jv_GCWatch (jobject obj)
296 _Jv_RegisterFinalizer (obj, fail_on_finalization);
300 _Jv_ThrowBadArrayIndex(jint bad_index)
302 JvThrow (new java::lang::ArrayIndexOutOfBoundsException
303 (java::lang::String::valueOf(bad_index)));
306 // Allocate some unscanned memory and throw an exception if no memory.
308 _Jv_AllocBytesChecked (jsize size)
310 void *r = _Jv_AllocBytes (size);
312 _Jv_Throw (no_memory);
316 // Allocate a new object of class C. SIZE is the size of the object
317 // to allocate. You might think this is redundant, but it isn't; some
318 // classes, such as String, aren't of fixed size.
320 _Jv_AllocObject (jclass c, jint size)
324 jobject obj = (jobject) _Jv_AllocObj (size);
325 if (__builtin_expect (! obj, 0))
327 *((_Jv_VTable **) obj) = c->vtable;
329 // If this class has inherited finalize from Object, then don't
330 // bother registering a finalizer. We know that finalize() is the
331 // very first method after the dummy entry. If this turns out to be
332 // unreliable, a more robust implementation can be written. Such an
333 // implementation would look for Object.finalize in Object's method
334 // table at startup, and then use that information to find the
335 // appropriate index in the method vector.
336 if (c->vtable->method[1] != ObjectClass.vtable->method[1])
337 _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
340 // Service JVMPI request.
342 if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, 0))
346 event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
348 event.u.obj_alloc.arena_id = 0;
349 event.u.obj_alloc.class_id = (jobjectID) c;
350 event.u.obj_alloc.is_array = 0;
351 event.u.obj_alloc.size = size;
352 event.u.obj_alloc.obj_id = (jobjectID) obj;
355 (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
363 // Allocate a new array of Java objects. Each object is of type
364 // `elementClass'. `init' is used to initialize each slot in the
367 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
369 if (__builtin_expect (count < 0, 0))
370 JvThrow (new java::lang::NegativeArraySizeException);
372 JvAssert (! elementClass->isPrimitive ());
374 jobjectArray obj = NULL;
375 size_t size = (size_t) _Jv_GetArrayElementFromElementType (obj,
378 // Check for overflow.
379 if (__builtin_expect ((size_t) count >
380 (SIZE_T_MAX - size) / sizeof (jobject), 0));
383 size += count * sizeof (jobject);
385 // FIXME: second argument should be "current loader" //
386 jclass clas = _Jv_FindArrayClass (elementClass, 0);
388 obj = (jobjectArray) _Jv_AllocArray (size);
389 if (__builtin_expect (! obj, 0))
392 jobject* ptr = elements(obj);
393 // We know the allocator returns zeroed memory. So don't bother
400 // Set the vtbl last to avoid problems if the GC happens during the
401 // window in this function between the allocation and this
403 *((_Jv_VTable **) obj) = clas->vtable;
407 // Allocate a new array of primitives. ELTYPE is the type of the
408 // element, COUNT is the size of the array.
410 _Jv_NewPrimArray (jclass eltype, jint count)
412 int elsize = eltype->size();
413 if (__builtin_expect (count < 0, 0))
414 JvThrow (new java::lang::NegativeArraySizeException ());
416 JvAssert (eltype->isPrimitive ());
417 jobject dummy = NULL;
418 size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
420 // Check for overflow.
421 if (__builtin_expect ((size_t) count >
422 (SIZE_T_MAX - size) / elsize, 0))
425 __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count);
426 if (__builtin_expect (! arr, 0))
429 // Note that we assume we are given zeroed memory by the allocator.
431 jclass klass = _Jv_FindArrayClass (eltype, 0);
432 // Set the vtbl last to avoid problems if the GC happens during the
433 // window in this function between the allocation and this
435 *((_Jv_VTable **) arr) = klass->vtable;
440 _Jv_NewArray (jint type, jint size)
444 case 4: return JvNewBooleanArray (size);
445 case 5: return JvNewCharArray (size);
446 case 6: return JvNewFloatArray (size);
447 case 7: return JvNewDoubleArray (size);
448 case 8: return JvNewByteArray (size);
449 case 9: return JvNewShortArray (size);
450 case 10: return JvNewIntArray (size);
451 case 11: return JvNewLongArray (size);
453 JvFail ("newarray - bad type code");
454 return NULL; // Placate compiler.
458 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
460 JvAssert (type->isArray());
461 jclass element_type = type->getComponentType();
463 if (element_type->isPrimitive())
464 result = _Jv_NewPrimArray (element_type, sizes[0]);
466 result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
470 JvAssert (! element_type->isPrimitive());
471 JvAssert (element_type->isArray());
472 jobject *contents = elements ((jobjectArray) result);
473 for (int i = 0; i < sizes[0]; ++i)
474 contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
482 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
485 jint sizes[dimensions];
486 va_start (args, dimensions);
487 for (int i = 0; i < dimensions; ++i)
489 jint size = va_arg (args, jint);
494 return _Jv_NewMultiArray (array_type, dimensions, sizes);
499 class _Jv_PrimClass : public java::lang::Class
502 // FIXME: calling convention is weird. If we use the natural types
503 // then the compiler will complain because they aren't Java types.
504 _Jv_PrimClass (jobject cname, jbyte sig, jint len)
506 using namespace java::lang::reflect;
508 // We must initialize every field of the class. We do this in
509 // the same order they are declared in Class.h.
511 name = _Jv_makeUtf8Const ((char *) cname, -1);
512 accflags = Modifier::PUBLIC | Modifier::FINAL;
515 constants.tags = NULL;
516 constants.data = NULL;
519 vtable_method_count = 0;
523 static_field_count = 0;
524 vtable = JV_PRIMITIVE_VTABLE;
528 state = JV_STATE_NOTHING;
533 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
534 _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN)
536 DECLARE_PRIM_TYPE(byte, 'B', 1);
537 DECLARE_PRIM_TYPE(short, 'S', 2);
538 DECLARE_PRIM_TYPE(int, 'I', 4);
539 DECLARE_PRIM_TYPE(long, 'J', 8);
540 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
541 DECLARE_PRIM_TYPE(char, 'C', 2);
542 DECLARE_PRIM_TYPE(float, 'F', 4);
543 DECLARE_PRIM_TYPE(double, 'D', 8);
544 DECLARE_PRIM_TYPE(void, 'V', 0);
547 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
552 return JvPrimClass (byte);
554 return JvPrimClass (short);
556 return JvPrimClass (int);
558 return JvPrimClass (long);
560 return JvPrimClass (boolean);
562 return JvPrimClass (char);
564 return JvPrimClass (float);
566 return JvPrimClass (double);
568 return JvPrimClass (void);
572 for (i = 1; sig[i] && sig[i] != ';'; ++i)
574 _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
575 return _Jv_FindClass (name, loader);
579 return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
582 JvFail ("couldn't understand class signature");
583 return NULL; // Placate compiler.
589 JvConvertArgv (int argc, const char **argv)
593 jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
594 jobject* ptr = elements(ar);
595 for (int i = 0; i < argc; i++)
597 const char *arg = argv[i];
598 // FIXME - should probably use JvNewStringUTF.
599 *ptr++ = JvNewStringLatin1(arg, strlen(arg));
601 return (JArray<jstring>*) ar;
604 // FIXME: These variables are static so that they will be
605 // automatically scanned by the Boehm collector. This is needed
606 // because with qthreads the collector won't scan the initial stack --
607 // it will only scan the qthreads stacks.
609 // Command line arguments.
610 static jobject arg_vec;
612 // The primary threadgroup.
613 static java::lang::ThreadGroup *main_group;
615 // The primary thread.
616 static java::lang::Thread *main_thread;
619 _Jv_ThisExecutable (void)
625 _Jv_ThisExecutable (const char *name)
629 _Jv_execName = new char[strlen (name) + 1];
630 strcpy (_Jv_execName, name);
634 #ifdef USE_WIN32_SIGNALLING
636 extern "C" int* win32_get_restart_frame (void *);
639 win32_exception_handler (LPEXCEPTION_POINTERS e)
642 if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
643 setjmp_buf = win32_get_restart_frame (nullp);
644 else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
645 setjmp_buf = win32_get_restart_frame (arithexception);
647 return EXCEPTION_CONTINUE_SEARCH;
649 e->ContextRecord->Ebp = setjmp_buf[0];
650 // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
651 e->ContextRecord->Eip = setjmp_buf[1];
652 // FIXME: Is this the stack pointer? Do we need it?
653 e->ContextRecord->Esp = setjmp_buf[2];
655 return EXCEPTION_CONTINUE_EXECUTION;
667 arithexception = new java::lang::ArithmeticException
668 (JvNewStringLatin1 ("/ by zero"));
671 no_memory = new java::lang::OutOfMemoryError;
674 LTDL_SET_PRELOADED_SYMBOLS ();
678 // Initialise winsock for networking
680 if (WSAStartup (MAKEWORD (1, 1), &data))
681 MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
682 #endif /* USE_WINSOCK */
684 #ifdef USE_WIN32_SIGNALLING
685 // Install exception handler
686 SetUnhandledExceptionFilter (win32_exception_handler);
688 // We only want this on POSIX systems.
689 struct sigaction act;
690 act.sa_handler = SIG_IGN;
691 sigemptyset (&act.sa_mask);
693 sigaction (SIGPIPE, &act, NULL);
694 #endif /* USE_WIN32_SIGNALLING */
699 #ifndef DISABLE_GETENV_PROPERTIES
702 next_property_key (char *s, size_t *length)
708 // Skip over whitespace
712 // If we've reached the end, return NULL. Also return NULL if for
713 // some reason we've come across a malformed property string.
719 // Determine the length of the property key.
737 next_property_value (char *s, size_t *length)
753 // If we've reached the end, return NULL.
757 // Determine the length of the property value.
776 process_gcj_properties ()
778 char *props = getenv("GCJ_PROPERTIES");
781 size_t property_count = 0;
786 // Whip through props quickly in order to count the number of
788 while (p && (p = next_property_key (p, &length)))
790 // Skip to the end of the key
793 p = next_property_value (p, &length);
800 // Allocate an array of property value/key pairs.
801 _Jv_Environment_Properties =
802 (property_pair *) malloc (sizeof(property_pair)
803 * (property_count + 1));
805 // Go through the properties again, initializing _Jv_Properties
809 while (p && (p = next_property_key (p, &length)))
811 _Jv_Environment_Properties[property_count].key = p;
812 _Jv_Environment_Properties[property_count].key_length = length;
814 // Skip to the end of the key
817 p = next_property_value (p, &length);
819 _Jv_Environment_Properties[property_count].value = p;
820 _Jv_Environment_Properties[property_count].value_length = length;
827 memset ((void *) &_Jv_Environment_Properties[property_count],
828 0, sizeof (property_pair));
832 // Null terminate the strings.
833 while (_Jv_Environment_Properties[i].key)
835 _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
836 _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
840 #endif // DISABLE_GETENV_PROPERTIES
843 JvRunMain (jclass klass, int argc, const char **argv)
845 PROCESS_GCJ_PROPERTIES;
848 #ifdef HAVE_PROC_SELF_EXE
850 sprintf (exec_name, "/proc/%d/exe", getpid ());
851 _Jv_ThisExecutable (exec_name);
853 _Jv_ThisExecutable (argv[0]);
856 arg_vec = JvConvertArgv (argc - 1, argv + 1);
857 main_group = new java::lang::ThreadGroup (23);
858 main_thread = new gnu::gcj::runtime::FirstThread (main_group,
861 main_thread->start();
864 java::lang::Runtime::getRuntime ()->exit (0);
868 _Jv_RunMain (const char *class_name, int argc, const char **argv)
870 PROCESS_GCJ_PROPERTIES;
874 #ifdef HAVE_PROC_SELF_EXE
876 sprintf (exec_name, "/proc/%d/exe", getpid ());
877 _Jv_ThisExecutable (exec_name);
880 arg_vec = JvConvertArgv (argc - 1, argv + 1);
881 main_group = new java::lang::ThreadGroup (23);
882 main_thread = new gnu::gcj::runtime::FirstThread (main_group,
883 JvNewStringLatin1 (class_name),
885 main_thread->start();
888 java::lang::Runtime::getRuntime ()->exit (0);
893 // Parse a string and return a heap size.
895 parse_heap_size (const char *spec)
898 unsigned long val = strtoul (spec, &end, 10);
899 if (*end == 'k' || *end == 'K')
901 else if (*end == 'm' || *end == 'M')
906 // Set the initial heap size. This might be ignored by the GC layer.
907 // This must be called before _Jv_RunMain.
909 _Jv_SetInitialHeapSize (const char *arg)
911 size_t size = parse_heap_size (arg);
912 _Jv_GCSetInitialHeapSize (size);
915 // Set the maximum heap size. This might be ignored by the GC layer.
916 // This must be called before _Jv_RunMain.
918 _Jv_SetMaximumHeapSize (const char *arg)
920 size_t size = parse_heap_size (arg);
921 _Jv_GCSetMaximumHeapSize (size);
927 _Jv_Malloc (jsize size)
929 if (__builtin_expect (size == 0, 0))
931 void *ptr = malloc ((size_t) size);
932 if (__builtin_expect (ptr == NULL, 0))
938 _Jv_Realloc (void *ptr, jsize size)
940 if (__builtin_expect (size == 0, 0))
942 ptr = realloc (ptr, (size_t) size);
943 if (__builtin_expect (ptr == NULL, 0))
949 _Jv_MallocUnchecked (jsize size)
951 if (__builtin_expect (size == 0, 0))
953 return malloc ((size_t) size);
964 // In theory, these routines can be #ifdef'd away on machines which
965 // support divide overflow signals. However, we never know if some
966 // code might have been compiled with "-fuse-divide-subroutine", so we
967 // always include them in libgcj.
970 _Jv_divI (jint dividend, jint divisor)
972 if (__builtin_expect (divisor == 0, 0))
973 _Jv_Throw (arithexception);
975 if (dividend == (jint) 0x80000000L && divisor == -1)
978 return dividend / divisor;
982 _Jv_remI (jint dividend, jint divisor)
984 if (__builtin_expect (divisor == 0, 0))
985 _Jv_Throw (arithexception);
987 if (dividend == (jint) 0x80000000L && divisor == -1)
990 return dividend % divisor;
994 _Jv_divJ (jlong dividend, jlong divisor)
996 if (__builtin_expect (divisor == 0, 0))
997 _Jv_Throw (arithexception);
999 if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1002 return dividend / divisor;
1006 _Jv_remJ (jlong dividend, jlong divisor)
1008 if (__builtin_expect (divisor == 0, 0))
1009 _Jv_Throw (arithexception);
1011 if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1014 return dividend % divisor;