1 // prims.cc - Code for core of runtime environment.
3 /* Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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
25 #include <java-signal.h>
26 #include <java-threads.h>
28 #ifndef DISABLE_GETENV_PROPERTIES
30 #include <java-props.h>
31 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
33 #define PROCESS_GCJ_PROPERTIES
34 #endif // DISABLE_GETENV_PROPERTIES
36 #include <java/lang/Class.h>
37 #include <java/lang/Runtime.h>
38 #include <java/lang/String.h>
39 #include <java/lang/Thread.h>
40 #include <java/lang/ThreadGroup.h>
41 #include <gnu/gcj/runtime/FirstThread.h>
42 #include <java/lang/ArrayIndexOutOfBoundsException.h>
43 #include <java/lang/ArithmeticException.h>
44 #include <java/lang/ClassFormatError.h>
45 #include <java/lang/NegativeArraySizeException.h>
46 #include <java/lang/NullPointerException.h>
47 #include <java/lang/OutOfMemoryError.h>
48 #include <java/lang/System.h>
49 #include <java/lang/reflect/Modifier.h>
50 #include <java/io/PrintStream.h>
56 #define ObjectClass _CL_Q34java4lang6Object
57 extern java::lang::Class ObjectClass;
59 // We allocate a single OutOfMemoryError exception which we keep
60 // around for use if we run out of memory.
61 static java::lang::OutOfMemoryError *no_memory;
63 // Largest representable size_t.
64 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
66 // Properties set at compile time.
67 const char **_Jv_Compiler_Properties;
69 #ifndef DISABLE_GETENV_PROPERTIES
70 // Property key/value pairs.
71 property_pair *_Jv_Environment_Properties;
74 // The name of this executable.
75 static char * _Jv_execName;
80 static java::lang::NullPointerException *nullp;
81 SIGNAL_HANDLER (catch_segv)
84 nullp->fillInStackTrace ();
89 static java::lang::ArithmeticException *arithexception;
92 SIGNAL_HANDLER (catch_fpe)
94 #ifdef HANDLE_DIVIDE_OVERFLOW
95 HANDLE_DIVIDE_OVERFLOW;
99 arithexception->fillInStackTrace ();
100 _Jv_Throw (arithexception);
107 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
110 register _Jv_ushort *aptr, *bptr;
113 if (a->hash != b->hash)
116 if (b->length != len)
118 aptr = (_Jv_ushort *)a->data;
119 bptr = (_Jv_ushort *)b->data;
120 len = (len + 1) >> 1;
122 if (*aptr++ != *bptr++)
127 /* True iff A is equal to STR.
128 HASH is STR->hashCode().
132 _Jv_equal (Utf8Const* a, jstring str, jint hash)
134 if (a->hash != (_Jv_ushort) hash)
136 jint len = str->length();
138 jchar *sptr = _Jv_GetStringChars (str);
139 register unsigned char* ptr = (unsigned char*) a->data;
140 register unsigned char* limit = ptr + a->length;
143 int ch = UTF8_GET (ptr, limit);
152 /* Like _Jv_equal, but stop after N characters. */
154 _Jv_equaln (Utf8Const *a, jstring str, jint n)
156 jint len = str->length();
158 jchar *sptr = _Jv_GetStringChars (str);
159 register unsigned char* ptr = (unsigned char*) a->data;
160 register unsigned char* limit = ptr + a->length;
161 for (; n-- > 0; i++, sptr++)
163 int ch = UTF8_GET (ptr, limit);
172 /* Count the number of Unicode chars encoded in a given Ut8 string. */
174 _Jv_strLengthUtf8(char* str, int len)
176 register unsigned char* ptr;
177 register unsigned char* limit;
180 ptr = (unsigned char*) str;
183 for (; ptr < limit; str_length++) {
184 if (UTF8_GET (ptr, limit) < 0) {
191 /* Calculate a hash value for a string encoded in Utf8 format.
192 * This returns the same hash value as specified or java.lang.String.hashCode.
195 hashUtf8String (char* str, int len)
197 register unsigned char* ptr = (unsigned char*) str;
198 register unsigned char* limit = ptr + len;
203 int ch = UTF8_GET (ptr, limit);
204 /* Updated specification from
205 http://www.javasoft.com/docs/books/jls/clarify.html. */
206 hash = (31 * hash) + ch;
212 _Jv_makeUtf8Const (char* s, int len)
216 Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
219 memcpy (m->data, s, len);
222 m->hash = hashUtf8String (s, len) & 0xFFFF;
227 _Jv_makeUtf8Const (jstring string)
229 jint hash = string->hashCode ();
230 jint len = _Jv_GetStringUTFLength (string);
232 Utf8Const* m = (Utf8Const*)
233 _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
238 _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
248 _Jv_Abort (const char *function, const char *file, int line,
252 _Jv_Abort (const char *, const char *, int, const char *message)
257 "libgcj failure: %s\n in function %s, file %s, line %d\n",
258 message, function, file, line);
260 java::io::PrintStream *err = java::lang::System::err;
261 err->print(JvNewStringLatin1 ("libgcj failure: "));
262 err->println(JvNewStringLatin1 (message));
269 fail_on_finalization (jobject)
271 JvFail ("object was finalized");
275 _Jv_GCWatch (jobject obj)
277 _Jv_RegisterFinalizer (obj, fail_on_finalization);
281 _Jv_ThrowBadArrayIndex(jint bad_index)
283 JvThrow (new java::lang::ArrayIndexOutOfBoundsException
284 (java::lang::String::valueOf(bad_index)));
287 // Allocate some unscanned memory and throw an exception if no memory.
289 _Jv_AllocBytesChecked (jsize size)
291 void *r = _Jv_AllocBytes (size);
293 _Jv_Throw (no_memory);
297 // Allocate a new object of class C. SIZE is the size of the object
298 // to allocate. You might think this is redundant, but it isn't; some
299 // classes, such as String, aren't of fixed size.
301 _Jv_AllocObject (jclass c, jint size)
305 jobject obj = (jobject) _Jv_AllocObj (size);
308 *((_Jv_VTable **) obj) = c->vtable;
310 // If this class has inherited finalize from Object, then don't
311 // bother registering a finalizer. We know that finalize() is the
312 // very first method after the dummy entry. If this turns out to be
313 // unreliable, a more robust implementation can be written. Such an
314 // implementation would look for Object.finalize in Object's method
315 // table at startup, and then use that information to find the
316 // appropriate index in the method vector.
317 if (c->vtable->method[1] != ObjectClass.vtable->method[1])
318 _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
323 // Allocate a new array of Java objects. Each object is of type
324 // `elementClass'. `init' is used to initialize each slot in the
327 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
330 JvThrow (new java::lang::NegativeArraySizeException);
332 JvAssert (! elementClass->isPrimitive ());
334 jobjectArray obj = NULL;
335 size_t size = (size_t) _Jv_GetArrayElementFromElementType (obj,
338 // Check for overflow.
339 if ((size_t) count > (SIZE_T_MAX - size) / sizeof (jobject))
342 size += count * sizeof (jobject);
344 // FIXME: second argument should be "current loader" //
345 jclass clas = _Jv_FindArrayClass (elementClass, 0);
347 obj = (jobjectArray) _Jv_AllocArray (size);
351 jobject* ptr = elements(obj);
352 // We know the allocator returns zeroed memory. So don't bother
359 // Set the vtbl last to avoid problems if the GC happens during the
360 // window in this function between the allocation and this
362 *((_Jv_VTable **) obj) = clas->vtable;
366 // Allocate a new array of primitives. ELTYPE is the type of the
367 // element, COUNT is the size of the array.
369 _Jv_NewPrimArray (jclass eltype, jint count)
371 int elsize = eltype->size();
373 JvThrow (new java::lang::NegativeArraySizeException ());
375 JvAssert (eltype->isPrimitive ());
376 jobject dummy = NULL;
377 size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
379 // Check for overflow.
380 if ((size_t) count > (SIZE_T_MAX - size) / elsize)
383 __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count);
387 // Note that we assume we are given zeroed memory by the allocator.
389 jclass klass = _Jv_FindArrayClass (eltype, 0);
390 // Set the vtbl last to avoid problems if the GC happens during the
391 // window in this function between the allocation and this
393 *((_Jv_VTable **) arr) = klass->vtable;
398 _Jv_NewArray (jint type, jint size)
402 case 4: return JvNewBooleanArray (size);
403 case 5: return JvNewCharArray (size);
404 case 6: return JvNewFloatArray (size);
405 case 7: return JvNewDoubleArray (size);
406 case 8: return JvNewByteArray (size);
407 case 9: return JvNewShortArray (size);
408 case 10: return JvNewIntArray (size);
409 case 11: return JvNewLongArray (size);
411 JvFail ("newarray - bad type code");
412 return NULL; // Placate compiler.
416 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
418 JvAssert (type->isArray());
419 jclass element_type = type->getComponentType();
421 if (element_type->isPrimitive())
422 result = _Jv_NewPrimArray (element_type, sizes[0]);
424 result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
428 JvAssert (! element_type->isPrimitive());
429 JvAssert (element_type->isArray());
430 jobject *contents = elements ((jobjectArray) result);
431 for (int i = 0; i < sizes[0]; ++i)
432 contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
440 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
443 jint sizes[dimensions];
444 va_start (args, dimensions);
445 for (int i = 0; i < dimensions; ++i)
447 jint size = va_arg (args, jint);
452 return _Jv_NewMultiArray (array_type, dimensions, sizes);
457 class _Jv_PrimClass : public java::lang::Class
460 // FIXME: calling convention is weird. If we use the natural types
461 // then the compiler will complain because they aren't Java types.
462 _Jv_PrimClass (jobject cname, jbyte sig, jint len)
464 using namespace java::lang::reflect;
466 // We must initialize every field of the class. We do this in
467 // the same order they are declared in Class.h.
469 name = _Jv_makeUtf8Const ((char *) cname, -1);
470 accflags = Modifier::PUBLIC | Modifier::FINAL;
473 constants.tags = NULL;
474 constants.data = NULL;
477 vtable_method_count = 0;
481 static_field_count = 0;
482 vtable = JV_PRIMITIVE_VTABLE;
486 state = JV_STATE_NOTHING;
491 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
492 _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN)
494 DECLARE_PRIM_TYPE(byte, 'B', 1);
495 DECLARE_PRIM_TYPE(short, 'S', 2);
496 DECLARE_PRIM_TYPE(int, 'I', 4);
497 DECLARE_PRIM_TYPE(long, 'J', 8);
498 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
499 DECLARE_PRIM_TYPE(char, 'C', 2);
500 DECLARE_PRIM_TYPE(float, 'F', 4);
501 DECLARE_PRIM_TYPE(double, 'D', 8);
502 DECLARE_PRIM_TYPE(void, 'V', 0);
505 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
510 return JvPrimClass (byte);
512 return JvPrimClass (short);
514 return JvPrimClass (int);
516 return JvPrimClass (long);
518 return JvPrimClass (boolean);
520 return JvPrimClass (char);
522 return JvPrimClass (float);
524 return JvPrimClass (double);
526 return JvPrimClass (void);
530 for (i = 1; sig[i] && sig[i] != ';'; ++i)
532 _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
533 return _Jv_FindClass (name, loader);
537 return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
540 JvFail ("couldn't understand class signature");
541 return NULL; // Placate compiler.
547 JvConvertArgv (int argc, const char **argv)
551 jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
552 jobject* ptr = elements(ar);
553 for (int i = 0; i < argc; i++)
555 const char *arg = argv[i];
556 // FIXME - should probably use JvNewStringUTF.
557 *ptr++ = JvNewStringLatin1(arg, strlen(arg));
559 return (JArray<jstring>*) ar;
562 // FIXME: These variables are static so that they will be
563 // automatically scanned by the Boehm collector. This is needed
564 // because with qthreads the collector won't scan the initial stack --
565 // it will only scan the qthreads stacks.
567 // Command line arguments.
568 static jobject arg_vec;
570 // The primary threadgroup.
571 static java::lang::ThreadGroup *main_group;
573 // The primary thread.
574 static java::lang::Thread *main_thread;
577 _Jv_ThisExecutable (void)
583 _Jv_ThisExecutable (const char *name)
587 _Jv_execName = new char[strlen (name) + 1];
588 strcpy (_Jv_execName, name);
599 arithexception = new java::lang::ArithmeticException
600 (JvNewStringLatin1 ("/ by zero"));
603 no_memory = new java::lang::OutOfMemoryError;
606 LTDL_SET_PRELOADED_SYMBOLS ();
609 // FIXME: we only want this on POSIX systems.
610 struct sigaction act;
611 act.sa_handler = SIG_IGN;
612 sigemptyset (&act.sa_mask);
614 sigaction (SIGPIPE, &act, NULL);
619 #ifndef DISABLE_GETENV_PROPERTIES
622 next_property_key (char *s, size_t *length)
628 // Skip over whitespace
632 // If we've reached the end, return NULL. Also return NULL if for
633 // some reason we've come across a malformed property string.
639 // Determine the length of the property key.
657 next_property_value (char *s, size_t *length)
673 // If we've reached the end, return NULL.
677 // Determine the length of the property value.
696 process_gcj_properties ()
698 char *props = getenv("GCJ_PROPERTIES");
701 size_t property_count = 0;
706 // Whip through props quickly in order to count the number of
708 while (p && (p = next_property_key (p, &length)))
710 // Skip to the end of the key
713 p = next_property_value (p, &length);
720 // Allocate an array of property value/key pairs.
721 _Jv_Environment_Properties =
722 (property_pair *) malloc (sizeof(property_pair)
723 * (property_count + 1));
725 // Go through the properties again, initializing _Jv_Properties
729 while (p && (p = next_property_key (p, &length)))
731 _Jv_Environment_Properties[property_count].key = p;
732 _Jv_Environment_Properties[property_count].key_length = length;
734 // Skip to the end of the key
737 p = next_property_value (p, &length);
739 _Jv_Environment_Properties[property_count].value = p;
740 _Jv_Environment_Properties[property_count].value_length = length;
747 memset ((void *) &_Jv_Environment_Properties[property_count],
748 0, sizeof (property_pair));
752 // Null terminate the strings.
753 while (_Jv_Environment_Properties[i].key)
755 _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
756 _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
760 #endif // DISABLE_GETENV_PROPERTIES
763 JvRunMain (jclass klass, int argc, const char **argv)
765 PROCESS_GCJ_PROPERTIES;
768 #ifdef HAVE_PROC_SELF_EXE
770 sprintf (exec_name, "/proc/%d/exe", getpid ());
771 _Jv_ThisExecutable (exec_name);
773 _Jv_ThisExecutable (argv[0]);
776 arg_vec = JvConvertArgv (argc - 1, argv + 1);
777 main_group = new java::lang::ThreadGroup (23);
778 main_thread = new gnu::gcj::runtime::FirstThread (main_group,
781 main_thread->start();
784 java::lang::Runtime::getRuntime ()->exit (0);
788 _Jv_RunMain (const char *class_name, int argc, const char **argv)
790 PROCESS_GCJ_PROPERTIES;
794 #ifdef HAVE_PROC_SELF_EXE
796 sprintf (exec_name, "/proc/%d/exe", getpid ());
797 _Jv_ThisExecutable (exec_name);
800 arg_vec = JvConvertArgv (argc - 1, argv + 1);
801 main_group = new java::lang::ThreadGroup (23);
802 main_thread = new gnu::gcj::runtime::FirstThread (main_group,
803 JvNewStringLatin1 (class_name),
805 main_thread->start();
808 java::lang::Runtime::getRuntime ()->exit (0);
813 // Parse a string and return a heap size.
815 parse_heap_size (const char *spec)
818 unsigned long val = strtoul (spec, &end, 10);
819 if (*end == 'k' || *end == 'K')
821 else if (*end == 'm' || *end == 'M')
826 // Set the initial heap size. This might be ignored by the GC layer.
827 // This must be called before _Jv_RunMain.
829 _Jv_SetInitialHeapSize (const char *arg)
831 size_t size = parse_heap_size (arg);
832 _Jv_GCSetInitialHeapSize (size);
835 // Set the maximum heap size. This might be ignored by the GC layer.
836 // This must be called before _Jv_RunMain.
838 _Jv_SetMaximumHeapSize (const char *arg)
840 size_t size = parse_heap_size (arg);
841 _Jv_GCSetMaximumHeapSize (size);
847 _Jv_Malloc (jsize size)
851 void *ptr = malloc ((size_t) size);
858 _Jv_Realloc (void *ptr, jsize size)
862 ptr = realloc (ptr, (size_t) size);
869 _Jv_MallocUnchecked (jsize size)
873 return malloc ((size_t) size);
884 // In theory, these routines can be #ifdef'd away on machines which
885 // support divide overflow signals. However, we never know if some
886 // code might have been compiled with "-fuse-divide-subroutine", so we
887 // always include them in libgcj.
890 _Jv_divI (jint dividend, jint divisor)
893 _Jv_Throw (arithexception);
895 if (dividend == (jint) 0x80000000L && divisor == -1)
898 return dividend / divisor;
902 _Jv_remI (jint dividend, jint divisor)
905 _Jv_Throw (arithexception);
907 if (dividend == (jint) 0x80000000L && divisor == -1)
910 return dividend % divisor;
914 _Jv_divJ (jlong dividend, jlong divisor)
917 _Jv_Throw (arithexception);
919 if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
922 return dividend / divisor;
926 _Jv_remJ (jlong dividend, jlong divisor)
929 _Jv_Throw (arithexception);
931 if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
934 return dividend % divisor;