libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <config.h>
  12 #include <platform.h>
  13
  14 #include <stdlib.h>
  15 #include <stdarg.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <signal.h>
  19
  20 #ifdef HAVE_UNISTD_H
  21 #include <unistd.h>
  22 #endif
  23
  24 #include <gcj/cni.h>
  25 #include <jvm.h>
  26 #include <java-signal.h>
  27 #include <java-threads.h>
  28 #include <java-interp.h>
  29
  30 #ifdef ENABLE_JVMPI
  31 #include <jvmpi.h>
  32 #include <java/lang/ThreadGroup.h>
  33 #endif
  34
  35 #ifndef DISABLE_GETENV_PROPERTIES
  36 #include <ctype.h>
  37 #include <java-props.h>
  38 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  39 #else
  40 #define PROCESS_GCJ_PROPERTIES
  41 #endif // DISABLE_GETENV_PROPERTIES
  42
  43 #include <java/lang/Class.h>
  44 #include <java/lang/ClassLoader.h>
  45 #include <java/lang/Runtime.h>
  46 #include <java/lang/String.h>
  47 #include <java/lang/Thread.h>
  48 #include <java/lang/ThreadGroup.h>
  49 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  50 #include <java/lang/ArithmeticException.h>
  51 #include <java/lang/ClassFormatError.h>
  52 #include <java/lang/InternalError.h>
  53 #include <java/lang/NegativeArraySizeException.h>
  54 #include <java/lang/NullPointerException.h>
  55 #include <java/lang/OutOfMemoryError.h>
  56 #include <java/lang/System.h>
  57 #include <java/lang/VMThrowable.h>
  58 #include <java/lang/VMClassLoader.h>
  59 #include <java/lang/reflect/Modifier.h>
  60 #include <java/io/PrintStream.h>
  61 #include <java/lang/UnsatisfiedLinkError.h>
  62 #include <java/lang/VirtualMachineError.h>
  63 #include <gnu/gcj/runtime/ExtensionClassLoader.h>
  64 #include <gnu/gcj/runtime/FinalizerThread.h>
  65 #include <execution.h>
  66 #include <gnu/java/lang/MainThread.h>
  67
  68 #ifdef USE_LTDL
  69 #include <ltdl.h>
  70 #endif
  71
  72 // Execution engine for compiled code.
  73 _Jv_CompiledEngine _Jv_soleCompiledEngine;
  74
  75 // We allocate a single OutOfMemoryError exception which we keep
  76 // around for use if we run out of memory.
  77 static java::lang::OutOfMemoryError *no_memory;
  78
  79 // Number of bytes in largest array object we create.  This could be
  80 // increased to the largest size_t value, so long as the appropriate
  81 // functions are changed to take a size_t argument instead of jint.
  82 #define MAX_OBJECT_SIZE ((1<<31) - 1)
  83
  84 // Properties set at compile time.
  85 const char **_Jv_Compiler_Properties = NULL;
  86 int _Jv_Properties_Count = 0;
  87
  88 #ifndef DISABLE_GETENV_PROPERTIES
  89 // Property key/value pairs.
  90 property_pair *_Jv_Environment_Properties;
  91 #endif
  92
  93 // Stash the argv pointer to benefit native libraries that need it.
  94 const char **_Jv_argv;
  95 int _Jv_argc;
  96
  97 // Argument support.
  98 int
  99 _Jv_GetNbArgs (void)
 100 {
 101   // _Jv_argc is 0 if not explicitly initialized.
 102   return _Jv_argc;
 103 }
 104
 105 const char *
 106 _Jv_GetSafeArg (int index)
 107 {
 108   if (index >=0 && index < _Jv_GetNbArgs ())
 109     return _Jv_argv[index];
 110   else
 111     return "";
 112 }
 113
 114 void
 115 _Jv_SetArgs (int argc, const char **argv)
 116 {
 117   _Jv_argc = argc;
 118   _Jv_argv = argv;
 119 }
 120
 121 #ifdef ENABLE_JVMPI
 122 // Pointer to JVMPI notification functions.
 123 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 124 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 125 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 126 #endif
 127 \f
 128
 129 #if defined (HANDLE_SEGV) || defined(HANDLE_FPE)
 130 /* Unblock a signal.  Unless we do this, the signal may only be sent
 131    once.  */
 132 static void
 133 unblock_signal (int signum __attribute__ ((__unused__)))
 134 {
 135 #ifdef _POSIX_VERSION
 136   sigset_t sigs;
 137
 138   sigemptyset (&sigs);
 139   sigaddset (&sigs, signum);
 140   sigprocmask (SIG_UNBLOCK, &sigs, NULL);
 141 #endif
 142 }
 143 #endif
 144
 145 #ifdef HANDLE_SEGV
 146 SIGNAL_HANDLER (catch_segv)
 147 {
 148   unblock_signal (SIGSEGV);
 149   MAKE_THROW_FRAME (nullp);
 150   java::lang::NullPointerException *nullp
 151     = new java::lang::NullPointerException;
 152   throw nullp;
 153 }
 154 #endif
 155
 156 #ifdef HANDLE_FPE
 157 SIGNAL_HANDLER (catch_fpe)
 158 {
 159   unblock_signal (SIGFPE);
 160 #ifdef HANDLE_DIVIDE_OVERFLOW
 161   HANDLE_DIVIDE_OVERFLOW;
 162 #else
 163   MAKE_THROW_FRAME (arithexception);
 164 #endif
 165   java::lang::ArithmeticException *arithexception
 166     = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
 167   throw arithexception;
 168 }
 169 #endif
 170
 171 \f
 172
 173 jboolean
 174 _Jv_equalUtf8Consts (const Utf8Const* a, const Utf8Const *b)
 175 {
 176   int len;
 177   const _Jv_ushort *aptr, *bptr;
 178   if (a == b)
 179     return true;
 180   if (a->hash != b->hash)
 181     return false;
 182   len = a->length;
 183   if (b->length != len)
 184     return false;
 185   aptr = (const _Jv_ushort *)a->data;
 186   bptr = (const _Jv_ushort *)b->data;
 187   len = (len + 1) >> 1;
 188   while (--len >= 0)
 189     if (*aptr++ != *bptr++)
 190       return false;
 191   return true;
 192 }
 193
 194 /* True iff A is equal to STR.
 195    HASH is STR->hashCode().
 196 */
 197
 198 jboolean
 199 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 200 {
 201   if (a->hash != (_Jv_ushort) hash)
 202     return false;
 203   jint len = str->length();
 204   jint i = 0;
 205   jchar *sptr = _Jv_GetStringChars (str);
 206   unsigned char* ptr = (unsigned char*) a->data;
 207   unsigned char* limit = ptr + a->length;
 208   for (;; i++, sptr++)
 209     {
 210       int ch = UTF8_GET (ptr, limit);
 211       if (i == len)
 212         return ch < 0;
 213       if (ch != *sptr)
 214         return false;
 215     }
 216   return true;
 217 }
 218
 219 /* Like _Jv_equal, but stop after N characters.  */
 220 jboolean
 221 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 222 {
 223   jint len = str->length();
 224   jint i = 0;
 225   jchar *sptr = _Jv_GetStringChars (str);
 226   unsigned char* ptr = (unsigned char*) a->data;
 227   unsigned char* limit = ptr + a->length;
 228   for (; n-- > 0; i++, sptr++)
 229     {
 230       int ch = UTF8_GET (ptr, limit);
 231       if (i == len)
 232         return ch < 0;
 233       if (ch != *sptr)
 234         return false;
 235     }
 236   return true;
 237 }
 238
 239 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 240 int
 241 _Jv_strLengthUtf8(char* str, int len)
 242 {
 243   unsigned char* ptr;
 244   unsigned char* limit;
 245   int str_length;
 246
 247   ptr = (unsigned char*) str;
 248   limit = ptr + len;
 249   str_length = 0;
 250   for (; ptr < limit; str_length++)
 251     {
 252       if (UTF8_GET (ptr, limit) < 0)
 253         return (-1);
 254     }
 255   return (str_length);
 256 }
 257
 258 /* Calculate a hash value for a string encoded in Utf8 format.
 259  * This returns the same hash value as specified or java.lang.String.hashCode.
 260  */
 261 jint
 262 _Jv_hashUtf8String (char* str, int len)
 263 {
 264   unsigned char* ptr = (unsigned char*) str;
 265   unsigned char* limit = ptr + len;
 266   jint hash = 0;
 267
 268   for (; ptr < limit;)
 269     {
 270       int ch = UTF8_GET (ptr, limit);
 271       /* Updated specification from
 272          http://www.javasoft.com/docs/books/jls/clarify.html. */
 273       hash = (31 * hash) + ch;
 274     }
 275   return hash;
 276 }
 277
 278 void
 279 _Jv_Utf8Const::init(char *s, int len)
 280 {
 281   ::memcpy (data, s, len);
 282   data[len] = 0;
 283   length = len;
 284   hash = _Jv_hashUtf8String (s, len) & 0xFFFF;
 285 }
 286
 287 _Jv_Utf8Const *
 288 _Jv_makeUtf8Const (char* s, int len)
 289 {
 290   if (len < 0)
 291     len = strlen (s);
 292   Utf8Const* m
 293     = (Utf8Const*) _Jv_AllocBytes (_Jv_Utf8Const::space_needed(s, len));
 294   m->init(s, len);
 295   return m;
 296 }
 297
 298 _Jv_Utf8Const *
 299 _Jv_makeUtf8Const (jstring string)
 300 {
 301   jint hash = string->hashCode ();
 302   jint len = _Jv_GetStringUTFLength (string);
 303
 304   Utf8Const* m = (Utf8Const*)
 305     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 306
 307   m->hash = hash;
 308   m->length = len;
 309
 310   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 311   m->data[len] = 0;
 312
 313   return m;
 314 }
 315
 316 \f
 317
 318 #ifdef DEBUG
 319 void
 320 _Jv_Abort (const char *function, const char *file, int line,
 321            const char *message)
 322 #else
 323 void
 324 _Jv_Abort (const char *, const char *, int, const char *message)
 325 #endif
 326 {
 327 #ifdef DEBUG
 328   fprintf (stderr,
 329            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 330            message, function, file, line);
 331 #else
 332   fprintf (stderr, "libgcj failure: %s\n", message);
 333 #endif
 334   abort ();
 335 }
 336
 337 static void
 338 fail_on_finalization (jobject)
 339 {
 340   JvFail ("object was finalized");
 341 }
 342
 343 void
 344 _Jv_GCWatch (jobject obj)
 345 {
 346   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 347 }
 348
 349 void
 350 _Jv_ThrowBadArrayIndex(jint bad_index)
 351 {
 352   throw new java::lang::ArrayIndexOutOfBoundsException
 353     (java::lang::String::valueOf (bad_index));
 354 }
 355
 356 void
 357 _Jv_ThrowNullPointerException ()
 358 {
 359   throw new java::lang::NullPointerException;
 360 }
 361
 362 // Explicitly throw a no memory exception.
 363 // The collector calls this when it encounters an out-of-memory condition.
 364 void _Jv_ThrowNoMemory()
 365 {
 366   throw no_memory;
 367 }
 368
 369 #ifdef ENABLE_JVMPI
 370 # define JVMPI_NOTIFY_ALLOC(klass,size,obj) \
 371     if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false)) \
 372       jvmpi_notify_alloc(klass,size,obj);
 373 static void
 374 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 375 {
 376   // Service JVMPI allocation request.
 377   JVMPI_Event event;
 378
 379   event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 380   event.env_id = NULL;
 381   event.u.obj_alloc.arena_id = 0;
 382   event.u.obj_alloc.class_id = (jobjectID) klass;
 383   event.u.obj_alloc.is_array = 0;
 384   event.u.obj_alloc.size = size;
 385   event.u.obj_alloc.obj_id = (jobjectID) obj;
 386
 387   // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 388   // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 389   // More importantly, I don't see the need for disabling GC, since we
 390   // blatantly have a pointer to obj on our stack, ensuring that the
 391   // object can't be collected.  Even for a nonconservative collector,
 392   // it appears to me that this must be true, since we are about to
 393   // return obj. Isn't this whole approach way too intrusive for
 394   // a useful profiling interface?                      - HB
 395   _Jv_DisableGC ();
 396   (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 397   _Jv_EnableGC ();
 398 }
 399 #else /* !ENABLE_JVMPI */
 400 # define JVMPI_NOTIFY_ALLOC(klass,size,obj) /* do nothing */
 401 #endif
 402
 403 // Allocate a new object of class KLASS.
 404 // First a version that assumes that we have no finalizer, and that
 405 // the class is already initialized.
 406 // If we know that JVMPI is disabled, this can be replaced by a direct call
 407 // to the allocator for the appropriate GC.
 408 jobject
 409 _Jv_AllocObjectNoInitNoFinalizer (jclass klass)
 410 {
 411   jint size = klass->size ();
 412   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 413   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 414   return obj;
 415 }
 416
 417 // And now a version that initializes if necessary.
 418 jobject
 419 _Jv_AllocObjectNoFinalizer (jclass klass)
 420 {
 421   _Jv_InitClass (klass);
 422   jint size = klass->size ();
 423   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 424   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 425   return obj;
 426 }
 427
 428 // And now the general version that registers a finalizer if necessary.
 429 jobject
 430 _Jv_AllocObject (jclass klass)
 431 {
 432   jobject obj = _Jv_AllocObjectNoFinalizer (klass);
 433
 434   // We assume that the compiler only generates calls to this routine
 435   // if there really is an interesting finalizer.
 436   // Unfortunately, we still have to the dynamic test, since there may
 437   // be cni calls to this routine.
 438   // Note that on IA64 get_finalizer() returns the starting address of the
 439   // function, not a function pointer.  Thus this still works.
 440   if (klass->vtable->get_finalizer ()
 441       != java::lang::Object::class$.vtable->get_finalizer ())
 442     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 443   return obj;
 444 }
 445
 446 // Allocate a String, including variable length storage.
 447 jstring
 448 _Jv_AllocString(jsize len)
 449 {
 450   using namespace java::lang;
 451
 452   jsize sz = sizeof(java::lang::String) + len * sizeof(jchar);
 453
 454   // We assert that for strings allocated this way, the data field
 455   // will always point to the object itself.  Thus there is no reason
 456   // for the garbage collector to scan any of it.
 457   // Furthermore, we're about to overwrite the string data, so
 458   // initialization of the object is not an issue.
 459
 460   // String needs no initialization, and there is no finalizer, so
 461   // we can go directly to the collector's allocator interface.
 462   jstring obj = (jstring) _Jv_AllocPtrFreeObj(sz, &String::class$);
 463
 464   obj->data = obj;
 465   obj->boffset = sizeof(java::lang::String);
 466   obj->count = len;
 467   obj->cachedHashCode = 0;
 468
 469   JVMPI_NOTIFY_ALLOC (&String::class$, sz, obj);
 470
 471   return obj;
 472 }
 473
 474 // A version of the above that assumes the object contains no pointers,
 475 // and requires no finalization.  This can't happen if we need pointers
 476 // to locks.
 477 #ifdef JV_HASH_SYNCHRONIZATION
 478 jobject
 479 _Jv_AllocPtrFreeObject (jclass klass)
 480 {
 481   _Jv_InitClass (klass);
 482   jint size = klass->size ();
 483
 484   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 485
 486   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 487
 488   return obj;
 489 }
 490 #endif /* JV_HASH_SYNCHRONIZATION */
 491
 492
 493 // Allocate a new array of Java objects.  Each object is of type
 494 // `elementClass'.  `init' is used to initialize each slot in the
 495 // array.
 496 jobjectArray
 497 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 498 {
 499   if (__builtin_expect (count < 0, false))
 500     throw new java::lang::NegativeArraySizeException;
 501
 502   JvAssert (! elementClass->isPrimitive ());
 503
 504   // Ensure that elements pointer is properly aligned.
 505   jobjectArray obj = NULL;
 506   size_t size = (size_t) elements (obj);
 507   // Check for overflow.
 508   if (__builtin_expect ((size_t) count >
 509                         (MAX_OBJECT_SIZE - 1 - size) / sizeof (jobject), false))
 510     throw no_memory;
 511
 512   size += count * sizeof (jobject);
 513
 514   jclass klass = _Jv_GetArrayClass (elementClass,
 515                                     elementClass->getClassLoaderInternal());
 516
 517   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 518   // Cast away const.
 519   jsize *lp = const_cast<jsize *> (&obj->length);
 520   *lp = count;
 521   // We know the allocator returns zeroed memory.  So don't bother
 522   // zeroing it again.
 523   if (init)
 524     {
 525       jobject *ptr = elements(obj);
 526       while (--count >= 0)
 527         *ptr++ = init;
 528     }
 529   return obj;
 530 }
 531
 532 // Allocate a new array of primitives.  ELTYPE is the type of the
 533 // element, COUNT is the size of the array.
 534 jobject
 535 _Jv_NewPrimArray (jclass eltype, jint count)
 536 {
 537   int elsize = eltype->size();
 538   if (__builtin_expect (count < 0, false))
 539     throw new java::lang::NegativeArraySizeException;
 540
 541   JvAssert (eltype->isPrimitive ());
 542   jobject dummy = NULL;
 543   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 544
 545   // Check for overflow.
 546   if (__builtin_expect ((size_t) count >
 547                         (MAX_OBJECT_SIZE - size) / elsize, false))
 548     throw no_memory;
 549
 550   jclass klass = _Jv_GetArrayClass (eltype, 0);
 551
 552 # ifdef JV_HASH_SYNCHRONIZATION
 553   // Since the vtable is always statically allocated,
 554   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 555   __JArray *arr =
 556     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 557   memset((char *)arr + size, 0, elsize * count);
 558 # else
 559   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 560   // Note that we assume we are given zeroed memory by the allocator.
 561 # endif
 562   // Cast away const.
 563   jsize *lp = const_cast<jsize *> (&arr->length);
 564   *lp = count;
 565
 566   return arr;
 567 }
 568
 569 jobject
 570 _Jv_NewArray (jint type, jint size)
 571 {
 572   switch (type)
 573     {
 574       case  4:  return JvNewBooleanArray (size);
 575       case  5:  return JvNewCharArray (size);
 576       case  6:  return JvNewFloatArray (size);
 577       case  7:  return JvNewDoubleArray (size);
 578       case  8:  return JvNewByteArray (size);
 579       case  9:  return JvNewShortArray (size);
 580       case 10:  return JvNewIntArray (size);
 581       case 11:  return JvNewLongArray (size);
 582     }
 583   throw new java::lang::InternalError
 584     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 585 }
 586
 587 // Allocate a possibly multi-dimensional array but don't check that
 588 // any array length is <0.
 589 static jobject
 590 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 591 {
 592   JvAssert (type->isArray());
 593   jclass element_type = type->getComponentType();
 594   jobject result;
 595   if (element_type->isPrimitive())
 596     result = _Jv_NewPrimArray (element_type, sizes[0]);
 597   else
 598     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 599
 600   if (dimensions > 1)
 601     {
 602       JvAssert (! element_type->isPrimitive());
 603       JvAssert (element_type->isArray());
 604       jobject *contents = elements ((jobjectArray) result);
 605       for (int i = 0; i < sizes[0]; ++i)
 606         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 607                                                   sizes + 1);
 608     }
 609
 610   return result;
 611 }
 612
 613 jobject
 614 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 615 {
 616   for (int i = 0; i < dimensions; ++i)
 617     if (sizes[i] < 0)
 618       throw new java::lang::NegativeArraySizeException;
 619
 620   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 621 }
 622
 623 jobject
 624 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 625 {
 626   va_list args;
 627   jint sizes[dimensions];
 628   va_start (args, dimensions);
 629   for (int i = 0; i < dimensions; ++i)
 630     {
 631       jint size = va_arg (args, jint);
 632       if (size < 0)
 633         throw new java::lang::NegativeArraySizeException;
 634       sizes[i] = size;
 635     }
 636   va_end (args);
 637
 638   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 639 }
 640
 641 \f
 642
 643 // Ensure 8-byte alignment, for hash synchronization.
 644 #define DECLARE_PRIM_TYPE(NAME)                 \
 645   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 646
 647 DECLARE_PRIM_TYPE(byte)
 648 DECLARE_PRIM_TYPE(short)
 649 DECLARE_PRIM_TYPE(int)
 650 DECLARE_PRIM_TYPE(long)
 651 DECLARE_PRIM_TYPE(boolean)
 652 DECLARE_PRIM_TYPE(char)
 653 DECLARE_PRIM_TYPE(float)
 654 DECLARE_PRIM_TYPE(double)
 655 DECLARE_PRIM_TYPE(void)
 656
 657 void
 658 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len)
 659 {
 660   using namespace java::lang::reflect;
 661
 662   // We must set the vtable for the class; the Java constructor
 663   // doesn't do this.
 664   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 665
 666   // Initialize the fields we care about.  We do this in the same
 667   // order they are declared in Class.h.
 668   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 669   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 670   cl->method_count = sig;
 671   cl->size_in_bytes = len;
 672   cl->vtable = JV_PRIMITIVE_VTABLE;
 673   cl->state = JV_STATE_DONE;
 674   cl->depth = -1;
 675 }
 676
 677 jclass
 678 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader,
 679                             char **endp)
 680 {
 681   // First count arrays.
 682   int array_count = 0;
 683   while (*sig == '[')
 684     {
 685       ++sig;
 686       ++array_count;
 687     }
 688
 689   jclass result = NULL;
 690   switch (*sig)
 691     {
 692     case 'B':
 693       result = JvPrimClass (byte);
 694       break;
 695     case 'S':
 696       result = JvPrimClass (short);
 697       break;
 698     case 'I':
 699       result = JvPrimClass (int);
 700       break;
 701     case 'J':
 702       result = JvPrimClass (long);
 703       break;
 704     case 'Z':
 705       result = JvPrimClass (boolean);
 706       break;
 707     case 'C':
 708       result = JvPrimClass (char);
 709       break;
 710     case 'F':
 711       result = JvPrimClass (float);
 712       break;
 713     case 'D':
 714       result = JvPrimClass (double);
 715       break;
 716     case 'V':
 717       result = JvPrimClass (void);
 718       break;
 719     case 'L':
 720       {
 721         char *save = ++sig;
 722         while (*sig && *sig != ';')
 723           ++sig;
 724         // Do nothing if signature appears to be malformed.
 725         if (*sig == ';')
 726           {
 727             _Jv_Utf8Const *name = _Jv_makeUtf8Const (save, sig - save);
 728             result = _Jv_FindClass (name, loader);
 729           }
 730         break;
 731       }
 732     default:
 733       // Do nothing -- bad signature.
 734       break;
 735     }
 736
 737   if (endp)
 738     {
 739       // Not really the "end", but the last valid character that we
 740       // looked at.
 741       *endp = sig;
 742     }
 743
 744   if (! result)
 745     return NULL;
 746
 747   // Find arrays.
 748   while (array_count-- > 0)
 749     result = _Jv_GetArrayClass (result, loader);
 750   return result;
 751 }
 752
 753 \f
 754
 755 JArray<jstring> *
 756 JvConvertArgv (int argc, const char **argv)
 757 {
 758   if (argc < 0)
 759     argc = 0;
 760   jobjectArray ar = JvNewObjectArray(argc, &java::lang::String::class$, NULL);
 761   jobject *ptr = elements(ar);
 762   jbyteArray bytes = NULL;
 763   for (int i = 0;  i < argc;  i++)
 764     {
 765       const char *arg = argv[i];
 766       int len = strlen (arg);
 767       if (bytes == NULL || bytes->length < len)
 768         bytes = JvNewByteArray (len);
 769       jbyte *bytePtr = elements (bytes);
 770       // We assume jbyte == char.
 771       memcpy (bytePtr, arg, len);
 772
 773       // Now convert using the default encoding.
 774       *ptr++ = new java::lang::String (bytes, 0, len);
 775     }
 776   return (JArray<jstring>*) ar;
 777 }
 778
 779 // FIXME: These variables are static so that they will be
 780 // automatically scanned by the Boehm collector.  This is needed
 781 // because with qthreads the collector won't scan the initial stack --
 782 // it will only scan the qthreads stacks.
 783
 784 // Command line arguments.
 785 static JArray<jstring> *arg_vec;
 786
 787 // The primary thread.
 788 static java::lang::Thread *main_thread;
 789
 790 #ifndef DISABLE_GETENV_PROPERTIES
 791
 792 static char *
 793 next_property_key (char *s, size_t *length)
 794 {
 795   size_t l = 0;
 796
 797   JvAssert (s);
 798
 799   // Skip over whitespace
 800   while (isspace (*s))
 801     s++;
 802
 803   // If we've reached the end, return NULL.  Also return NULL if for
 804   // some reason we've come across a malformed property string.
 805   if (*s == 0
 806       || *s == ':'
 807       || *s == '=')
 808     return NULL;
 809
 810   // Determine the length of the property key.
 811   while (s[l] != 0
 812          && ! isspace (s[l])
 813          && s[l] != ':'
 814          && s[l] != '=')
 815     {
 816       if (s[l] == '\\'
 817           && s[l+1] != 0)
 818         l++;
 819       l++;
 820     }
 821
 822   *length = l;
 823
 824   return s;
 825 }
 826
 827 static char *
 828 next_property_value (char *s, size_t *length)
 829 {
 830   size_t l = 0;
 831
 832   JvAssert (s);
 833
 834   while (isspace (*s))
 835     s++;
 836
 837   if (*s == ':'
 838       || *s == '=')
 839     s++;
 840
 841   while (isspace (*s))
 842     s++;
 843
 844   // If we've reached the end, return NULL.
 845   if (*s == 0)
 846     return NULL;
 847
 848   // Determine the length of the property value.
 849   while (s[l] != 0
 850          && ! isspace (s[l])
 851          && s[l] != ':'
 852          && s[l] != '=')
 853     {
 854       if (s[l] == '\\'
 855           && s[l+1] != 0)
 856         l += 2;
 857       else
 858         l++;
 859     }
 860
 861   *length = l;
 862
 863   return s;
 864 }
 865
 866 static void
 867 process_gcj_properties ()
 868 {
 869   char *props = getenv("GCJ_PROPERTIES");
 870   char *p = props;
 871   size_t length;
 872   size_t property_count = 0;
 873
 874   if (NULL == props)
 875     return;
 876
 877   // Whip through props quickly in order to count the number of
 878   // property values.
 879   while (p && (p = next_property_key (p, &length)))
 880     {
 881       // Skip to the end of the key
 882       p += length;
 883
 884       p = next_property_value (p, &length);
 885       if (p)
 886         p += length;
 887
 888       property_count++;
 889     }
 890
 891   // Allocate an array of property value/key pairs.
 892   _Jv_Environment_Properties =
 893     (property_pair *) malloc (sizeof(property_pair)
 894                               * (property_count + 1));
 895
 896   // Go through the properties again, initializing _Jv_Properties
 897   // along the way.
 898   p = props;
 899   property_count = 0;
 900   while (p && (p = next_property_key (p, &length)))
 901     {
 902       _Jv_Environment_Properties[property_count].key = p;
 903       _Jv_Environment_Properties[property_count].key_length = length;
 904
 905       // Skip to the end of the key
 906       p += length;
 907
 908       p = next_property_value (p, &length);
 909
 910       _Jv_Environment_Properties[property_count].value = p;
 911       _Jv_Environment_Properties[property_count].value_length = length;
 912
 913       if (p)
 914         p += length;
 915
 916       property_count++;
 917     }
 918   memset ((void *) &_Jv_Environment_Properties[property_count],
 919           0, sizeof (property_pair));
 920
 921   // Null terminate the strings.
 922   for (property_pair *prop = &_Jv_Environment_Properties[0];
 923        prop->key != NULL;
 924        prop++)
 925     {
 926       prop->key[prop->key_length] = 0;
 927       prop->value[prop->value_length] = 0;
 928     }
 929 }
 930 #endif // DISABLE_GETENV_PROPERTIES
 931
 932 namespace gcj
 933 {
 934   _Jv_Utf8Const *void_signature;
 935   _Jv_Utf8Const *clinit_name;
 936   _Jv_Utf8Const *init_name;
 937   _Jv_Utf8Const *finit_name;
 938
 939   bool runtimeInitialized = false;
 940 }
 941
 942 // We accept all non-standard options accepted by Sun's java command,
 943 // for compatibility with existing application launch scripts.
 944 static jint
 945 parse_x_arg (char* option_string)
 946 {
 947   if (strlen (option_string) <= 0)
 948     return -1;
 949
 950   if (! strcmp (option_string, "int"))
 951     {
 952       // FIXME: this should cause the vm to never load shared objects
 953     }
 954   else if (! strcmp (option_string, "mixed"))
 955     {
 956       // FIXME: allow interpreted and native code
 957     }
 958   else if (! strcmp (option_string, "batch"))
 959     {
 960       // FIXME: disable background JIT'ing
 961     }
 962   else if (! strcmp (option_string, "debug"))
 963     {
 964       // FIXME: add JDWP/JVMDI support
 965     }
 966   else if (! strncmp (option_string, "bootclasspath:", 14))
 967     {
 968       // FIXME: add a parse_bootclasspath_arg function
 969     }
 970   else if (! strncmp (option_string, "bootclasspath/a:", 16))
 971     {
 972     }
 973   else if (! strncmp (option_string, "bootclasspath/p:", 16))
 974     {
 975     }
 976   else if (! strcmp (option_string, "check:jni"))
 977     {
 978       // FIXME: enable strict JNI checking
 979     }
 980   else if (! strcmp (option_string, "future"))
 981     {
 982       // FIXME: enable strict class file format checks
 983     }
 984   else if (! strcmp (option_string, "noclassgc"))
 985     {
 986       // FIXME: disable garbage collection for classes
 987     }
 988   else if (! strcmp (option_string, "incgc"))
 989     {
 990       // FIXME: incremental garbage collection
 991     }
 992   else if (! strncmp (option_string, "loggc:", 6))
 993     {
 994       if (option_string[6] == '\0')
 995         {
 996           fprintf (stderr,
 997                    "libgcj: filename argument expected for loggc option\n");
 998           return -1;
 999         }
1000       // FIXME: set gc logging filename
1001     }
1002   else if (! strncmp (option_string, "ms", 2))
1003     {
1004       // FIXME: ignore this option until PR 20699 is fixed.
1005       // _Jv_SetInitialHeapSize (option_string + 2);
1006     }
1007   else if (! strncmp (option_string, "mx", 2))
1008     _Jv_SetMaximumHeapSize (option_string + 2);
1009   else if (! strcmp (option_string, "prof"))
1010     {
1011       // FIXME: enable profiling of program running in vm
1012     }
1013   else if (! strncmp (option_string, "runhprof:", 9))
1014     {
1015       // FIXME: enable specific type of vm profiling.  add a
1016       // parse_runhprof_arg function
1017     }
1018   else if (! strcmp (option_string, "rs"))
1019     {
1020       // FIXME: reduced system signal usage.  disable thread dumps,
1021       // only terminate in response to user-initiated calls,
1022       // e.g. System.exit()
1023     }
1024   else if (! strncmp (option_string, "ss", 2))
1025     {
1026       // FIXME: set thread stack size
1027     }
1028   else if (! strcmp (option_string, "X:+UseAltSigs"))
1029     {
1030       // FIXME: use signals other than SIGUSR1 and SIGUSR2
1031     }
1032   else if (! strcmp (option_string, "share:off"))
1033     {
1034       // FIXME: don't share class data
1035     }
1036   else if (! strcmp (option_string, "share:auto"))
1037     {
1038       // FIXME: share class data where possible
1039     }
1040   else if (! strcmp (option_string, "share:on"))
1041     {
1042       // FIXME: fail if impossible to share class data
1043     }
1044
1045   return 0;
1046 }
1047
1048 static jint
1049 parse_verbose_args (char* option_string,
1050                     bool ignore_unrecognized)
1051 {
1052   size_t len = sizeof ("-verbose");
1053
1054   if (strlen (option_string) < len)
1055     return -1;
1056
1057   if (option_string[len] == ':'
1058       && option_string[len + 1] != '\0')
1059     {
1060       char* verbose_args = option_string + len + 1;
1061       size_t last = 0;
1062
1063       do
1064         {
1065           if (! strncmp (verbose_args,
1066                          "gc", (last = sizeof ("gc")) - 1)
1067               && (verbose_args[last] == '\0'
1068                   || verbose_args[last] == ','))
1069             {
1070               // FIXME: we should add functions to boehm-gc that
1071               // toggle GC_print_stats, GC_PRINT_ADDRESS_MAP and
1072               // GC_print_back_height.
1073
1074             }
1075           else if (! strncmp (verbose_args,
1076                               "class",
1077                               (last = sizeof ("class")) - 1)
1078                    && (verbose_args[last] == '\0'
1079                        || verbose_args[last] == ','))
1080             {
1081               gcj::verbose_class_flag = true;
1082             }
1083           else if (! strncmp (verbose_args, "jni",
1084                               (last = sizeof ("jni")) - 1)
1085                    && (verbose_args[last] == '\0'
1086                        || verbose_args[last] == ','))
1087             {
1088               // FIXME: enable JNI messages.
1089             }
1090           else if (ignore_unrecognized
1091                    && verbose_args[0] == 'X')
1092             {
1093               // ignore unrecognized non-standard verbose option
1094               last = 0;
1095               while (verbose_args[last] != '\0'
1096                      && verbose_args[last++] != ',');
1097             }
1098
1099           if (strlen (verbose_args) >= last)
1100             {
1101               if (verbose_args[last] == ',')
1102                 {
1103                   if (verbose_args[last + 1] == '\0')
1104                     // trailing comma
1105                     return -1;
1106                   else
1107                     {
1108                       verbose_args = verbose_args + last + 1;
1109                       last = 0;
1110                     }
1111                 }
1112               // here verbose_args[last] is either '\0' or
1113               // the first character in the next verbose
1114               // argument.
1115             }
1116           else
1117             // partial option
1118             return -1;
1119
1120           // verbose_args[last] will be '\0' here if we're
1121           // done.
1122         }
1123       while (verbose_args[last] != '\0');
1124     }
1125   else if (option_string[len] == 'g'
1126            && option_string[len + 1] == 'c'
1127            && option_string[len + 2] == '\0')
1128     {
1129       // FIXME: we should add functions to boehm-gc that
1130       // toggle GC_print_stats, GC_PRINT_ADDRESS_MAP and
1131       // GC_print_back_height.
1132       return 0;
1133     }
1134   else if (option_string[len] == '\0')
1135     {
1136       gcj::verbose_class_flag = true;
1137       return 0;
1138     }
1139   else
1140     {
1141       // unrecognized option beginning with -verbose
1142       return -1;
1143     }
1144   return 0;
1145 }
1146
1147 static jint
1148 parse_init_args (JvVMInitArgs* vm_args)
1149 {
1150   // if _Jv_Compiler_Properties is non-NULL then it needs to be
1151   // re-allocated dynamically.
1152   if (_Jv_Compiler_Properties)
1153     {
1154       const char** props = _Jv_Compiler_Properties;
1155       _Jv_Compiler_Properties = NULL;
1156
1157       for (int i = 0; props[i]; i++)
1158         {
1159           _Jv_Compiler_Properties = (const char**) _Jv_Realloc
1160             (_Jv_Compiler_Properties,
1161              (_Jv_Properties_Count + 1) * sizeof (const char*));
1162           _Jv_Compiler_Properties[_Jv_Properties_Count++] = props[i];
1163         }
1164     }
1165
1166   if (vm_args == NULL)
1167     return 0;
1168
1169   for (int i = 0; i < vm_args->nOptions; ++i)
1170     {
1171       char* option_string = vm_args->options[i].optionString;
1172       if (! strcmp (option_string, "vfprintf")
1173           || ! strcmp (option_string, "exit")
1174           || ! strcmp (option_string, "abort"))
1175         {
1176           // FIXME: we are required to recognize these, but for
1177           // now we don't handle them in any way.
1178           continue;
1179         }
1180       else if (! strncmp (option_string,
1181                           "-verbose", sizeof ("-verbose") - 1))
1182         {
1183           jint result = parse_verbose_args (option_string,
1184                                             vm_args->ignoreUnrecognized);
1185           if (result < 0)
1186             return result;
1187         }
1188       else if (! strncmp (option_string, "-D", 2))
1189         {
1190           _Jv_Compiler_Properties = (const char**) _Jv_Realloc
1191             (_Jv_Compiler_Properties,
1192              (_Jv_Properties_Count + 1) * sizeof (char*));
1193
1194           _Jv_Compiler_Properties[_Jv_Properties_Count++] =
1195             strdup (option_string + 2);
1196
1197           continue;
1198         }
1199       else if (vm_args->ignoreUnrecognized)
1200         {
1201           if (option_string[0] == '_')
1202             parse_x_arg (option_string + 1);
1203           else if (! strncmp (option_string, "-X", 2))
1204             parse_x_arg (option_string + 2);
1205           else
1206             {
1207             unknown_option:
1208               fprintf (stderr, "libgcj: unknown option: %s\n", option_string);
1209               return -1;
1210             }
1211         }
1212       else
1213         goto unknown_option;
1214     }
1215   return 0;
1216 }
1217
1218 jint
1219 _Jv_CreateJavaVM (JvVMInitArgs* vm_args)
1220 {
1221   using namespace gcj;
1222
1223   if (runtimeInitialized)
1224     return -1;
1225
1226   runtimeInitialized = true;
1227
1228   jint result = parse_init_args (vm_args);
1229   if (result < 0)
1230     return -1;
1231
1232   PROCESS_GCJ_PROPERTIES;
1233
1234   /* Threads must be initialized before the GC, so that it inherits the
1235      signal mask.  */
1236   _Jv_InitThreads ();
1237   _Jv_InitGC ();
1238   _Jv_InitializeSyncMutex ();
1239
1240 #ifdef INTERPRETER
1241   _Jv_InitInterpreter ();
1242 #endif
1243
1244 #ifdef HANDLE_SEGV
1245   INIT_SEGV;
1246 #endif
1247
1248 #ifdef HANDLE_FPE
1249   INIT_FPE;
1250 #endif
1251
1252   /* Initialize Utf8 constants declared in jvm.h. */
1253   void_signature = _Jv_makeUtf8Const ("()V", 3);
1254   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
1255   init_name = _Jv_makeUtf8Const ("<init>", 6);
1256   finit_name = _Jv_makeUtf8Const ("finit$", 6);
1257
1258   /* Initialize built-in classes to represent primitive TYPEs. */
1259   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1);
1260   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2);
1261   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4);
1262   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8);
1263   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1);
1264   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2);
1265   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4);
1266   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8);
1267   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0);
1268
1269   // Turn stack trace generation off while creating exception objects.
1270   _Jv_InitClass (&java::lang::VMThrowable::class$);
1271   java::lang::VMThrowable::trace_enabled = 0;
1272
1273   // We have to initialize this fairly early, to avoid circular class
1274   // initialization.  In particular we want to start the
1275   // initialization of ClassLoader before we start the initialization
1276   // of VMClassLoader.
1277   _Jv_InitClass (&java::lang::ClassLoader::class$);
1278
1279   // Set up the system class loader and the bootstrap class loader.
1280   gnu::gcj::runtime::ExtensionClassLoader::initialize();
1281   java::lang::VMClassLoader::initialize(JvNewStringLatin1(TOOLEXECLIBDIR));
1282
1283   _Jv_RegisterBootstrapPackages();
1284
1285   no_memory = new java::lang::OutOfMemoryError;
1286
1287   java::lang::VMThrowable::trace_enabled = 1;
1288
1289 #ifdef USE_LTDL
1290   LTDL_SET_PRELOADED_SYMBOLS ();
1291 #endif
1292
1293   _Jv_platform_initialize ();
1294
1295   _Jv_JNI_Init ();
1296
1297   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
1298
1299   // Start the GC finalizer thread.  A VirtualMachineError can be
1300   // thrown by the runtime if, say, threads aren't available.
1301   try
1302     {
1303       using namespace gnu::gcj::runtime;
1304       FinalizerThread *ft = new FinalizerThread ();
1305       ft->start ();
1306     }
1307   catch (java::lang::VirtualMachineError *ignore)
1308     {
1309     }
1310
1311   return 0;
1312 }
1313
1314 void
1315 _Jv_RunMain (JvVMInitArgs *vm_args, jclass klass, const char *name, int argc,
1316              const char **argv, bool is_jar)
1317 {
1318 #ifndef DISABLE_MAIN_ARGS
1319   _Jv_SetArgs (argc, argv);
1320 #endif
1321
1322   java::lang::Runtime *runtime = NULL;
1323
1324   try
1325     {
1326       if (_Jv_CreateJavaVM (vm_args) < 0)
1327         {
1328           fprintf (stderr, "libgcj: couldn't create virtual machine\n");
1329           exit (1);
1330         }
1331
1332       // Get the Runtime here.  We want to initialize it before searching
1333       // for `main'; that way it will be set up if `main' is a JNI method.
1334       runtime = java::lang::Runtime::getRuntime ();
1335
1336 #ifdef DISABLE_MAIN_ARGS
1337       arg_vec = JvConvertArgv (0, 0);
1338 #else
1339       arg_vec = JvConvertArgv (argc - 1, argv + 1);
1340 #endif
1341
1342       using namespace gnu::java::lang;
1343       if (klass)
1344         main_thread = new MainThread (klass, arg_vec);
1345       else
1346         main_thread = new MainThread (JvNewStringLatin1 (name),
1347                                       arg_vec, is_jar);
1348     }
1349   catch (java::lang::Throwable *t)
1350     {
1351       java::lang::System::err->println (JvNewStringLatin1
1352         ("Exception during runtime initialization"));
1353       t->printStackTrace();
1354       if (runtime)
1355         runtime->exit (1);
1356       // In case the runtime creation failed.
1357       ::exit (1);
1358     }
1359
1360   _Jv_AttachCurrentThread (main_thread);
1361   _Jv_ThreadRun (main_thread);
1362   _Jv_ThreadWait ();
1363
1364   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1365   runtime->exit (status);
1366 }
1367
1368 void
1369 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
1370              bool is_jar)
1371 {
1372   _Jv_RunMain (NULL, klass, name, argc, argv, is_jar);
1373 }
1374
1375 void
1376 JvRunMain (jclass klass, int argc, const char **argv)
1377 {
1378   _Jv_RunMain (klass, NULL, argc, argv, false);
1379 }
1380
1381 \f
1382
1383 // Parse a string and return a heap size.
1384 static size_t
1385 parse_heap_size (const char *spec)
1386 {
1387   char *end;
1388   unsigned long val = strtoul (spec, &end, 10);
1389   if (*end == 'k' || *end == 'K')
1390     val *= 1024;
1391   else if (*end == 'm' || *end == 'M')
1392     val *= 1048576;
1393   return (size_t) val;
1394 }
1395
1396 // Set the initial heap size.  This might be ignored by the GC layer.
1397 // This must be called before _Jv_RunMain.
1398 void
1399 _Jv_SetInitialHeapSize (const char *arg)
1400 {
1401   size_t size = parse_heap_size (arg);
1402   _Jv_GCSetInitialHeapSize (size);
1403 }
1404
1405 // Set the maximum heap size.  This might be ignored by the GC layer.
1406 // This must be called before _Jv_RunMain.
1407 void
1408 _Jv_SetMaximumHeapSize (const char *arg)
1409 {
1410   size_t size = parse_heap_size (arg);
1411   _Jv_GCSetMaximumHeapSize (size);
1412 }
1413
1414 \f
1415
1416 void *
1417 _Jv_Malloc (jsize size)
1418 {
1419   if (__builtin_expect (size == 0, false))
1420     size = 1;
1421   void *ptr = malloc ((size_t) size);
1422   if (__builtin_expect (ptr == NULL, false))
1423     throw no_memory;
1424   return ptr;
1425 }
1426
1427 void *
1428 _Jv_Realloc (void *ptr, jsize size)
1429 {
1430   if (__builtin_expect (size == 0, false))
1431     size = 1;
1432   ptr = realloc (ptr, (size_t) size);
1433   if (__builtin_expect (ptr == NULL, false))
1434     throw no_memory;
1435   return ptr;
1436 }
1437
1438 void *
1439 _Jv_MallocUnchecked (jsize size)
1440 {
1441   if (__builtin_expect (size == 0, false))
1442     size = 1;
1443   return malloc ((size_t) size);
1444 }
1445
1446 void
1447 _Jv_Free (void* ptr)
1448 {
1449   return free (ptr);
1450 }
1451
1452 \f
1453
1454 // In theory, these routines can be #ifdef'd away on machines which
1455 // support divide overflow signals.  However, we never know if some
1456 // code might have been compiled with "-fuse-divide-subroutine", so we
1457 // always include them in libgcj.
1458
1459 jint
1460 _Jv_divI (jint dividend, jint divisor)
1461 {
1462   if (__builtin_expect (divisor == 0, false))
1463     {
1464       java::lang::ArithmeticException *arithexception
1465         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1466       throw arithexception;
1467     }
1468
1469   if (dividend == (jint) 0x80000000L && divisor == -1)
1470     return dividend;
1471
1472   return dividend / divisor;
1473 }
1474
1475 jint
1476 _Jv_remI (jint dividend, jint divisor)
1477 {
1478   if (__builtin_expect (divisor == 0, false))
1479     {
1480       java::lang::ArithmeticException *arithexception
1481         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1482       throw arithexception;
1483     }
1484
1485   if (dividend == (jint) 0x80000000L && divisor == -1)
1486     return 0;
1487
1488   return dividend % divisor;
1489 }
1490
1491 jlong
1492 _Jv_divJ (jlong dividend, jlong divisor)
1493 {
1494   if (__builtin_expect (divisor == 0, false))
1495     {
1496       java::lang::ArithmeticException *arithexception
1497         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1498       throw arithexception;
1499     }
1500
1501   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1502     return dividend;
1503
1504   return dividend / divisor;
1505 }
1506
1507 jlong
1508 _Jv_remJ (jlong dividend, jlong divisor)
1509 {
1510   if (__builtin_expect (divisor == 0, false))
1511     {
1512       java::lang::ArithmeticException *arithexception
1513         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1514       throw arithexception;
1515     }
1516
1517   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1518     return 0;
1519
1520   return dividend % divisor;
1521 }
1522
1523 \f
1524
1525 // Return true if SELF_KLASS can access a field or method in
1526 // OTHER_KLASS.  The field or method's access flags are specified in
1527 // FLAGS.
1528 jboolean
1529 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1530 {
1531   using namespace java::lang::reflect;
1532   return ((self_klass == other_klass)
1533           || ((flags & Modifier::PUBLIC) != 0)
1534           || (((flags & Modifier::PROTECTED) != 0)
1535               && _Jv_IsAssignableFromSlow (other_klass, self_klass))
1536           || (((flags & Modifier::PRIVATE) == 0)
1537               && _Jv_ClassNameSamePackage (self_klass->name,
1538                                            other_klass->name)));
1539 }