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 <java/lang/FirstThread.h>
42 #include <java/lang/ArrayIndexOutOfBoundsException.h>
43 #include <java/lang/ArithmeticException.h>
44 #include <java/lang/ClassFormatError.h>
45 #include <java/lang/ClassCastException.h>
46 #include <java/lang/NegativeArraySizeException.h>
47 #include <java/lang/NullPointerException.h>
48 #include <java/lang/OutOfMemoryError.h>
49 #include <java/lang/ArrayStoreException.h>
50 #include <java/lang/System.h>
51 #include <java/lang/reflect/Modifier.h>
52 #include <java/io/PrintStream.h>
58 #define ObjectClass _CL_Q34java4lang6Object
59 extern java::lang::Class ObjectClass;
61 // We allocate a single OutOfMemoryError exception which we keep
62 // around for use if we run out of memory.
63 static java::lang::OutOfMemoryError *no_memory;
65 // Largest representable size_t.
66 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
68 // Properties set at compile time.
69 const char **_Jv_Compiler_Properties;
71 #ifndef DISABLE_GETENV_PROPERTIES
72 // Property key/value pairs.
73 property_pair *_Jv_Environment_Properties;
76 // The name of this executable.
77 static char * _Jv_execName;
82 static java::lang::NullPointerException *nullp;
83 SIGNAL_HANDLER (catch_segv)
86 nullp->fillInStackTrace ();
91 static java::lang::ArithmeticException *arithexception;
94 SIGNAL_HANDLER (catch_fpe)
96 #ifdef HANDLE_DIVIDE_OVERFLOW
97 HANDLE_DIVIDE_OVERFLOW;
101 arithexception->fillInStackTrace ();
102 _Jv_Throw (arithexception);
109 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
112 register _Jv_ushort *aptr, *bptr;
115 if (a->hash != b->hash)
118 if (b->length != len)
120 aptr = (_Jv_ushort *)a->data;
121 bptr = (_Jv_ushort *)b->data;
122 len = (len + 1) >> 1;
124 if (*aptr++ != *bptr++)
129 /* True iff A is equal to STR.
130 HASH is STR->hashCode().
134 _Jv_equal (Utf8Const* a, jstring str, jint hash)
136 if (a->hash != (_Jv_ushort) hash)
138 jint len = str->length();
140 jchar *sptr = _Jv_GetStringChars (str);
141 register unsigned char* ptr = (unsigned char*) a->data;
142 register unsigned char* limit = ptr + a->length;
145 int ch = UTF8_GET (ptr, limit);
154 /* Like _Jv_equal, but stop after N characters. */
156 _Jv_equaln (Utf8Const *a, jstring str, jint n)
158 jint len = str->length();
160 jchar *sptr = _Jv_GetStringChars (str);
161 register unsigned char* ptr = (unsigned char*) a->data;
162 register unsigned char* limit = ptr + a->length;
163 for (; n-- > 0; i++, sptr++)
165 int ch = UTF8_GET (ptr, limit);
174 /* Count the number of Unicode chars encoded in a given Ut8 string. */
176 _Jv_strLengthUtf8(char* str, int len)
178 register unsigned char* ptr;
179 register unsigned char* limit;
182 ptr = (unsigned char*) str;
185 for (; ptr < limit; str_length++) {
186 if (UTF8_GET (ptr, limit) < 0) {
193 /* Calculate a hash value for a string encoded in Utf8 format.
194 * This returns the same hash value as specified or java.lang.String.hashCode.
197 hashUtf8String (char* str, int len)
199 register unsigned char* ptr = (unsigned char*) str;
200 register unsigned char* limit = ptr + len;
205 int ch = UTF8_GET (ptr, limit);
206 /* Updated specification from
207 http://www.javasoft.com/docs/books/jls/clarify.html. */
208 hash = (31 * hash) + ch;
214 _Jv_makeUtf8Const (char* s, int len)
218 Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
221 memcpy (m->data, s, len);
224 m->hash = hashUtf8String (s, len) & 0xFFFF;
229 _Jv_makeUtf8Const (jstring string)
231 jint hash = string->hashCode ();
232 jint len = _Jv_GetStringUTFLength (string);
234 Utf8Const* m = (Utf8Const*)
235 _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
240 _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
250 _Jv_Abort (const char *function, const char *file, int line,
254 _Jv_Abort (const char *, const char *, int, const char *message)
259 "libgcj failure: %s\n in function %s, file %s, line %d\n",
260 message, function, file, line);
262 java::io::PrintStream *err = java::lang::System::err;
263 err->print(JvNewStringLatin1 ("libgcj failure: "));
264 err->println(JvNewStringLatin1 (message));
271 fail_on_finalization (jobject)
273 JvFail ("object was finalized");
277 _Jv_GCWatch (jobject obj)
279 _Jv_RegisterFinalizer (obj, fail_on_finalization);
283 _Jv_ThrowBadArrayIndex(jint bad_index)
285 JvThrow (new java::lang::ArrayIndexOutOfBoundsException
286 (java::lang::String::valueOf(bad_index)));
290 _Jv_CheckCast (jclass c, jobject obj)
292 if (obj != NULL && ! c->isAssignableFrom(obj->getClass()))
293 JvThrow (new java::lang::ClassCastException);
298 _Jv_CheckArrayStore (jobject arr, jobject obj)
302 JvAssert (arr != NULL);
303 jclass arr_class = arr->getClass();
304 JvAssert (arr_class->isArray());
305 jclass elt_class = arr_class->getComponentType();
306 jclass obj_class = obj->getClass();
307 if (! elt_class->isAssignableFrom(obj_class))
308 JvThrow (new java::lang::ArrayStoreException);
314 // Allocate some unscanned memory and throw an exception if no memory.
316 _Jv_AllocBytesChecked (jsize size)
318 void *r = _Jv_AllocBytes (size);
320 _Jv_Throw (no_memory);
324 // Allocate a new object of class C. SIZE is the size of the object
325 // to allocate. You might think this is redundant, but it isn't; some
326 // classes, such as String, aren't of fixed size.
328 _Jv_AllocObject (jclass c, jint size)
332 jobject obj = (jobject) _Jv_AllocObj (size);
335 *((_Jv_VTable **) obj) = c->vtable;
337 // If this class has inherited finalize from Object, then don't
338 // bother registering a finalizer. We know that finalize() is the
339 // very first method after the dummy entry. If this turns out to be
340 // unreliable, a more robust implementation can be written. Such an
341 // implementation would look for Object.finalize in Object's method
342 // table at startup, and then use that information to find the
343 // appropriate index in the method vector.
344 if (c->vtable->method[1] != ObjectClass.vtable->method[1])
345 _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
350 // Allocate a new array of Java objects. Each object is of type
351 // `elementClass'. `init' is used to initialize each slot in the
354 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
357 JvThrow (new java::lang::NegativeArraySizeException);
359 JvAssert (! elementClass->isPrimitive ());
361 jobjectArray obj = NULL;
362 size_t size = (size_t) _Jv_GetArrayElementFromElementType (obj,
365 // Check for overflow.
366 if ((size_t) count > (SIZE_T_MAX - size) / sizeof (jobject))
369 size += count * sizeof (jobject);
371 // FIXME: second argument should be "current loader" //
372 jclass clas = _Jv_FindArrayClass (elementClass, 0);
374 obj = (jobjectArray) _Jv_AllocArray (size);
378 jobject* ptr = elements(obj);
379 // We know the allocator returns zeroed memory. So don't bother
386 // Set the vtbl last to avoid problems if the GC happens during the
387 // window in this function between the allocation and this
389 *((_Jv_VTable **) obj) = clas->vtable;
393 // Allocate a new array of primitives. ELTYPE is the type of the
394 // element, COUNT is the size of the array.
396 _Jv_NewPrimArray (jclass eltype, jint count)
398 int elsize = eltype->size();
400 JvThrow (new java::lang::NegativeArraySizeException ());
402 JvAssert (eltype->isPrimitive ());
403 jobject dummy = NULL;
404 size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
406 // Check for overflow.
407 if ((size_t) count > (SIZE_T_MAX - size) / elsize)
410 __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count);
414 // Note that we assume we are given zeroed memory by the allocator.
416 jclass klass = _Jv_FindArrayClass (eltype, 0);
417 // Set the vtbl last to avoid problems if the GC happens during the
418 // window in this function between the allocation and this
420 *((_Jv_VTable **) arr) = klass->vtable;
425 JvNewCharArray (jint length)
427 return (jcharArray) _Jv_NewPrimArray (JvPrimClass (char), length);
431 JvNewBooleanArray (jint length)
433 return (jbooleanArray) _Jv_NewPrimArray (JvPrimClass (boolean), length);
437 JvNewByteArray (jint length)
439 return (jbyteArray) _Jv_NewPrimArray (JvPrimClass (byte), length);
443 JvNewShortArray (jint length)
445 return (jshortArray) _Jv_NewPrimArray (JvPrimClass (short), length);
449 JvNewIntArray (jint length)
451 return (jintArray) _Jv_NewPrimArray (JvPrimClass (int), length);
455 JvNewLongArray (jint length)
457 return (jlongArray) _Jv_NewPrimArray (JvPrimClass (long), length);
461 JvNewFloatArray (jint length)
463 return (jfloatArray) _Jv_NewPrimArray (JvPrimClass (float), length);
467 JvNewDoubleArray (jint length)
469 return (jdoubleArray) _Jv_NewPrimArray (JvPrimClass (double), length);
473 _Jv_NewArray (jint type, jint size)
477 case 4: return JvNewBooleanArray (size);
478 case 5: return JvNewCharArray (size);
479 case 6: return JvNewFloatArray (size);
480 case 7: return JvNewDoubleArray (size);
481 case 8: return JvNewByteArray (size);
482 case 9: return JvNewShortArray (size);
483 case 10: return JvNewIntArray (size);
484 case 11: return JvNewLongArray (size);
486 JvFail ("newarray - bad type code");
487 return NULL; // Placate compiler.
491 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
493 JvAssert (type->isArray());
494 jclass element_type = type->getComponentType();
496 if (element_type->isPrimitive())
497 result = _Jv_NewPrimArray (element_type, sizes[0]);
499 result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
503 JvAssert (! element_type->isPrimitive());
504 JvAssert (element_type->isArray());
505 jobject *contents = elements ((jobjectArray) result);
506 for (int i = 0; i < sizes[0]; ++i)
507 contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
515 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
518 jint sizes[dimensions];
519 va_start (args, dimensions);
520 for (int i = 0; i < dimensions; ++i)
522 jint size = va_arg (args, jint);
527 return _Jv_NewMultiArray (array_type, dimensions, sizes);
532 class _Jv_PrimClass : public java::lang::Class
535 // FIXME: calling convention is weird. If we use the natural types
536 // then the compiler will complain because they aren't Java types.
537 _Jv_PrimClass (jobject cname, jbyte sig, jint len)
539 using namespace java::lang::reflect;
541 // We must initialize every field of the class. We do this in
542 // the same order they are declared in Class.h.
544 name = _Jv_makeUtf8Const ((char *) cname, -1);
545 accflags = Modifier::PUBLIC | Modifier::FINAL;
548 constants.tags = NULL;
549 constants.data = NULL;
552 vtable_method_count = 0;
556 static_field_count = 0;
557 vtable = JV_PRIMITIVE_VTABLE;
561 state = JV_STATE_NOTHING;
566 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
567 _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN)
569 DECLARE_PRIM_TYPE(byte, 'B', 1);
570 DECLARE_PRIM_TYPE(short, 'S', 2);
571 DECLARE_PRIM_TYPE(int, 'I', 4);
572 DECLARE_PRIM_TYPE(long, 'J', 8);
573 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
574 DECLARE_PRIM_TYPE(char, 'C', 2);
575 DECLARE_PRIM_TYPE(float, 'F', 4);
576 DECLARE_PRIM_TYPE(double, 'D', 8);
577 DECLARE_PRIM_TYPE(void, 'V', 0);
580 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
585 return JvPrimClass (byte);
587 return JvPrimClass (short);
589 return JvPrimClass (int);
591 return JvPrimClass (long);
593 return JvPrimClass (boolean);
595 return JvPrimClass (char);
597 return JvPrimClass (float);
599 return JvPrimClass (double);
601 return JvPrimClass (void);
605 for (i = 1; sig[i] && sig[i] != ';'; ++i)
607 _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
608 return _Jv_FindClass (name, loader);
612 return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
615 JvFail ("couldn't understand class signature");
616 return NULL; // Placate compiler.
622 JvConvertArgv (int argc, const char **argv)
626 jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
627 jobject* ptr = elements(ar);
628 for (int i = 0; i < argc; i++)
630 const char *arg = argv[i];
631 // FIXME - should probably use JvNewStringUTF.
632 *ptr++ = JvNewStringLatin1(arg, strlen(arg));
634 return (JArray<jstring>*) ar;
637 // FIXME: These variables are static so that they will be
638 // automatically scanned by the Boehm collector. This is needed
639 // because with qthreads the collector won't scan the initial stack --
640 // it will only scan the qthreads stacks.
642 // Command line arguments.
643 static jobject arg_vec;
645 // The primary threadgroup.
646 static java::lang::ThreadGroup *main_group;
648 // The primary thread.
649 static java::lang::Thread *main_thread;
652 _Jv_ThisExecutable (void)
658 _Jv_ThisExecutable (const char *name)
662 _Jv_execName = new char[strlen (name) + 1];
663 strcpy (_Jv_execName, name);
674 arithexception = new java::lang::ArithmeticException
675 (JvNewStringLatin1 ("/ by zero"));
678 no_memory = new java::lang::OutOfMemoryError;
681 LTDL_SET_PRELOADED_SYMBOLS ();
684 // FIXME: we only want this on POSIX systems.
685 struct sigaction act;
686 act.sa_handler = SIG_IGN;
687 sigemptyset (&act.sa_mask);
689 sigaction (SIGPIPE, &act, NULL);
694 #ifndef DISABLE_GETENV_PROPERTIES
697 next_property_key (char *s, size_t *length)
703 // Skip over whitespace
707 // If we've reached the end, return NULL. Also return NULL if for
708 // some reason we've come across a malformed property string.
714 // Determine the length of the property key.
732 next_property_value (char *s, size_t *length)
748 // If we've reached the end, return NULL.
752 // Determine the length of the property value.
771 process_gcj_properties ()
773 char *props = getenv("GCJ_PROPERTIES");
776 size_t property_count = 0;
781 // Whip through props quickly in order to count the number of
783 while (p && (p = next_property_key (p, &length)))
785 // Skip to the end of the key
788 p = next_property_value (p, &length);
795 // Allocate an array of property value/key pairs.
796 _Jv_Environment_Properties =
797 (property_pair *) malloc (sizeof(property_pair)
798 * (property_count + 1));
800 // Go through the properties again, initializing _Jv_Properties
804 while (p && (p = next_property_key (p, &length)))
806 _Jv_Environment_Properties[property_count].key = p;
807 _Jv_Environment_Properties[property_count].key_length = length;
809 // Skip to the end of the key
812 p = next_property_value (p, &length);
814 _Jv_Environment_Properties[property_count].value = p;
815 _Jv_Environment_Properties[property_count].value_length = length;
822 memset ((void *) &_Jv_Environment_Properties[property_count],
823 0, sizeof (property_pair));
827 // Null terminate the strings.
828 while (_Jv_Environment_Properties[i].key)
830 _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
831 _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
835 #endif // DISABLE_GETENV_PROPERTIES
838 JvRunMain (jclass klass, int argc, const char **argv)
840 PROCESS_GCJ_PROPERTIES;
843 #ifdef HAVE_PROC_SELF_EXE
845 sprintf (exec_name, "/proc/%d/exe", getpid ());
846 _Jv_ThisExecutable (exec_name);
848 _Jv_ThisExecutable (argv[0]);
851 arg_vec = JvConvertArgv (argc - 1, argv + 1);
852 main_group = new java::lang::ThreadGroup (23);
853 main_thread = new java::lang::FirstThread (main_group, klass, arg_vec);
855 main_thread->start();
858 java::lang::Runtime::getRuntime ()->exit (0);
862 _Jv_RunMain (const char *class_name, int argc, const char **argv)
864 PROCESS_GCJ_PROPERTIES;
868 #ifdef HAVE_PROC_SELF_EXE
870 sprintf (exec_name, "/proc/%d/exe", getpid ());
871 _Jv_ThisExecutable (exec_name);
874 arg_vec = JvConvertArgv (argc - 1, argv + 1);
875 main_group = new java::lang::ThreadGroup (23);
876 main_thread = new java::lang::FirstThread (main_group,
877 JvNewStringLatin1 (class_name),
879 main_thread->start();
882 java::lang::Runtime::getRuntime ()->exit (0);
887 // Parse a string and return a heap size.
889 parse_heap_size (const char *spec)
892 unsigned long val = strtoul (spec, &end, 10);
893 if (*end == 'k' || *end == 'K')
895 else if (*end == 'm' || *end == 'M')
900 // Set the initial heap size. This might be ignored by the GC layer.
901 // This must be called before _Jv_RunMain.
903 _Jv_SetInitialHeapSize (const char *arg)
905 size_t size = parse_heap_size (arg);
906 _Jv_GCSetInitialHeapSize (size);
909 // Set the maximum heap size. This might be ignored by the GC layer.
910 // This must be called before _Jv_RunMain.
912 _Jv_SetMaximumHeapSize (const char *arg)
914 size_t size = parse_heap_size (arg);
915 _Jv_GCSetMaximumHeapSize (size);
921 _Jv_MallocUnchecked (jsize size)
925 return malloc ((size_t) size);
929 _Jv_Malloc (jsize size)
933 void *ptr = malloc ((size_t) size);
947 // In theory, these routines can be #ifdef'd away on machines which
948 // support divide overflow signals. However, we never know if some
949 // code might have been compiled with "-fuse-divide-subroutine", so we
950 // always include them in libgcj.
953 _Jv_divI (jint dividend, jint divisor)
956 _Jv_Throw (arithexception);
958 if (dividend == (jint) 0x80000000L && divisor == -1)
961 return dividend / divisor;
965 _Jv_remI (jint dividend, jint divisor)
968 _Jv_Throw (arithexception);
970 if (dividend == (jint) 0x80000000L && divisor == -1)
973 return dividend % divisor;
977 _Jv_divJ (jlong dividend, jlong divisor)
980 _Jv_Throw (arithexception);
982 if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
985 return dividend / divisor;
989 _Jv_remJ (jlong dividend, jlong divisor)
992 _Jv_Throw (arithexception);
994 if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
997 return dividend % divisor;