libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006  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/ClassNotFoundException.h>
  53 #include <java/lang/InternalError.h>
  54 #include <java/lang/NegativeArraySizeException.h>
  55 #include <java/lang/NoClassDefFoundError.h>
  56 #include <java/lang/NullPointerException.h>
  57 #include <java/lang/OutOfMemoryError.h>
  58 #include <java/lang/System.h>
  59 #include <java/lang/VMThrowable.h>
  60 #include <java/lang/VMClassLoader.h>
  61 #include <java/lang/reflect/Modifier.h>
  62 #include <java/io/PrintStream.h>
  63 #include <java/lang/UnsatisfiedLinkError.h>
  64 #include <java/lang/VirtualMachineError.h>
  65 #include <gnu/gcj/runtime/ExtensionClassLoader.h>
  66 #include <gnu/gcj/runtime/FinalizerThread.h>
  67 #include <execution.h>
  68 #include <gnu/java/lang/MainThread.h>
  69
  70 #ifdef USE_LTDL
  71 #include <ltdl.h>
  72 #endif
  73
  74 // Execution engine for compiled code.
  75 _Jv_CompiledEngine _Jv_soleCompiledEngine;
  76
  77 // Execution engine for code compiled with -findirect-classes
  78 _Jv_IndirectCompiledEngine _Jv_soleIndirectCompiledEngine;
  79
  80 // We allocate a single OutOfMemoryError exception which we keep
  81 // around for use if we run out of memory.
  82 static java::lang::OutOfMemoryError *no_memory;
  83
  84 // Number of bytes in largest array object we create.  This could be
  85 // increased to the largest size_t value, so long as the appropriate
  86 // functions are changed to take a size_t argument instead of jint.
  87 #define MAX_OBJECT_SIZE ((1<<31) - 1)
  88
  89 // Properties set at compile time.
  90 const char **_Jv_Compiler_Properties = NULL;
  91 int _Jv_Properties_Count = 0;
  92
  93 #ifndef DISABLE_GETENV_PROPERTIES
  94 // Property key/value pairs.
  95 property_pair *_Jv_Environment_Properties;
  96 #endif
  97
  98 // Stash the argv pointer to benefit native libraries that need it.
  99 const char **_Jv_argv;
 100 int _Jv_argc;
 101
 102 // Argument support.
 103 int
 104 _Jv_GetNbArgs (void)
 105 {
 106   // _Jv_argc is 0 if not explicitly initialized.
 107   return _Jv_argc;
 108 }
 109
 110 const char *
 111 _Jv_GetSafeArg (int index)
 112 {
 113   if (index >=0 && index < _Jv_GetNbArgs ())
 114     return _Jv_argv[index];
 115   else
 116     return "";
 117 }
 118
 119 void
 120 _Jv_SetArgs (int argc, const char **argv)
 121 {
 122   _Jv_argc = argc;
 123   _Jv_argv = argv;
 124 }
 125
 126 #ifdef ENABLE_JVMPI
 127 // Pointer to JVMPI notification functions.
 128 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 129 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 130 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 131 #endif
 132 \f
 133
 134 #if defined (HANDLE_SEGV) || defined(HANDLE_FPE)
 135 /* Unblock a signal.  Unless we do this, the signal may only be sent
 136    once.  */
 137 static void
 138 unblock_signal (int signum __attribute__ ((__unused__)))
 139 {
 140 #ifdef _POSIX_VERSION
 141   sigset_t sigs;
 142
 143   sigemptyset (&sigs);
 144   sigaddset (&sigs, signum);
 145   sigprocmask (SIG_UNBLOCK, &sigs, NULL);
 146 #endif
 147 }
 148 #endif
 149
 150 #ifdef HANDLE_SEGV
 151 SIGNAL_HANDLER (catch_segv)
 152 {
 153   unblock_signal (SIGSEGV);
 154   MAKE_THROW_FRAME (nullp);
 155   java::lang::NullPointerException *nullp
 156     = new java::lang::NullPointerException;
 157   throw nullp;
 158 }
 159 #endif
 160
 161 #ifdef HANDLE_FPE
 162 SIGNAL_HANDLER (catch_fpe)
 163 {
 164   unblock_signal (SIGFPE);
 165 #ifdef HANDLE_DIVIDE_OVERFLOW
 166   HANDLE_DIVIDE_OVERFLOW;
 167 #else
 168   MAKE_THROW_FRAME (arithexception);
 169 #endif
 170   java::lang::ArithmeticException *arithexception
 171     = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
 172   throw arithexception;
 173 }
 174 #endif
 175
 176
 177 jboolean
 178 _Jv_equalUtf8Consts (const Utf8Const* a, const Utf8Const *b)
 179 {
 180   int len;
 181   const _Jv_ushort *aptr, *bptr;
 182   if (a == b)
 183     return true;
 184   if (a->hash != b->hash)
 185     return false;
 186   len = a->length;
 187   if (b->length != len)
 188     return false;
 189   aptr = (const _Jv_ushort *)a->data;
 190   bptr = (const _Jv_ushort *)b->data;
 191   len = (len + 1) >> 1;
 192   while (--len >= 0)
 193     if (*aptr++ != *bptr++)
 194       return false;
 195   return true;
 196 }
 197
 198 /* True iff A is equal to STR.
 199    HASH is STR->hashCode().
 200 */
 201
 202 jboolean
 203 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 204 {
 205   if (a->hash != (_Jv_ushort) hash)
 206     return false;
 207   jint len = str->length();
 208   jint i = 0;
 209   jchar *sptr = _Jv_GetStringChars (str);
 210   unsigned char* ptr = (unsigned char*) a->data;
 211   unsigned char* limit = ptr + a->length;
 212   for (;; i++, sptr++)
 213     {
 214       int ch = UTF8_GET (ptr, limit);
 215       if (i == len)
 216         return ch < 0;
 217       if (ch != *sptr)
 218         return false;
 219     }
 220   return true;
 221 }
 222
 223 /* Like _Jv_equal, but stop after N characters.  */
 224 jboolean
 225 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 226 {
 227   jint len = str->length();
 228   jint i = 0;
 229   jchar *sptr = _Jv_GetStringChars (str);
 230   unsigned char* ptr = (unsigned char*) a->data;
 231   unsigned char* limit = ptr + a->length;
 232   for (; n-- > 0; i++, sptr++)
 233     {
 234       int ch = UTF8_GET (ptr, limit);
 235       if (i == len)
 236         return ch < 0;
 237       if (ch != *sptr)
 238         return false;
 239     }
 240   return true;
 241 }
 242
 243 // Determines whether the given Utf8Const object contains
 244 // a type which is primitive or some derived form of it, eg.
 245 // an array or multi-dimensional array variant.
 246 jboolean
 247 _Jv_isPrimitiveOrDerived(const Utf8Const *a)
 248 {
 249   unsigned char *aptr = (unsigned char *) a->data;
 250   unsigned char *alimit = aptr + a->length;
 251   int ac = UTF8_GET(aptr, alimit);
 252
 253   // Skips any leading array marks.
 254   while (ac == '[')
 255     ac = UTF8_GET(aptr, alimit);
 256
 257   // There should not be another character. This implies that
 258   // the type name is only one character long.
 259   if (UTF8_GET(aptr, alimit) == -1)
 260     switch ( ac )
 261       {
 262         case 'Z':
 263         case 'B':
 264         case 'C':
 265         case 'S':
 266         case 'I':
 267         case 'J':
 268         case 'F':
 269         case 'D':
 270           return true;
 271         default:
 272           break;
 273        }
 274
 275    return false;
 276 }
 277
 278 // Find out whether two _Jv_Utf8Const candidates contain the same
 279 // classname.
 280 // The method is written to handle the different formats of classnames.
 281 // Eg. "Ljava/lang/Class;", "Ljava.lang.Class;", "java/lang/Class" and
 282 // "java.lang.Class" will be seen as equal.
 283 // Warning: This function is not smart enough to declare "Z" and "boolean"
 284 // and similar cases as equal (and is not meant to be used this way)!
 285 jboolean
 286 _Jv_equalUtf8Classnames (const Utf8Const *a, const Utf8Const *b)
 287 {
 288   // If the class name's length differs by two characters
 289   // it is possible that we have candidates which are given
 290   // in the two different formats ("Lp1/p2/cn;" vs. "p1/p2/cn")
 291   switch (a->length - b->length)
 292     {
 293       case -2:
 294       case 0:
 295       case 2:
 296         break;
 297       default:
 298         return false;
 299     }
 300
 301   unsigned char *aptr = (unsigned char *) a->data;
 302   unsigned char *alimit = aptr + a->length;
 303   unsigned char *bptr = (unsigned char *) b->data;
 304   unsigned char *blimit = bptr + b->length;
 305
 306   if (alimit[-1] == ';')
 307     alimit--;
 308
 309   if (blimit[-1] == ';')
 310     blimit--;
 311
 312   int ac = UTF8_GET(aptr, alimit);
 313   int bc = UTF8_GET(bptr, blimit);
 314
 315   // Checks whether both strings have the same amount of leading [ characters.
 316   while (ac == '[')
 317     {
 318       if (bc == '[')
 319         {
 320           ac = UTF8_GET(aptr, alimit);
 321           bc = UTF8_GET(bptr, blimit);
 322           continue;
 323         }
 324
 325       return false;
 326     }
 327
 328   // Skips leading L character.
 329   if (ac == 'L')
 330     ac = UTF8_GET(aptr, alimit);
 331
 332   if (bc == 'L')
 333     bc = UTF8_GET(bptr, blimit);
 334
 335   // Compares the remaining characters.
 336   while (ac != -1 && bc != -1)
 337     {
 338       // Replaces package separating dots with slashes.
 339       if (ac == '.')
 340         ac = '/';
 341
 342       if (bc == '.')
 343         bc = '/';
 344
 345       // Now classnames differ if there is at least one non-matching
 346       // character.
 347       if (ac != bc)
 348         return false;
 349
 350       ac = UTF8_GET(aptr, alimit);
 351       bc = UTF8_GET(bptr, blimit);
 352     }
 353
 354   return (ac == bc);
 355 }
 356
 357 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 358 int
 359 _Jv_strLengthUtf8(const char* str, int len)
 360 {
 361   unsigned char* ptr;
 362   unsigned char* limit;
 363   int str_length;
 364
 365   ptr = (unsigned char*) str;
 366   limit = ptr + len;
 367   str_length = 0;
 368   for (; ptr < limit; str_length++)
 369     {
 370       if (UTF8_GET (ptr, limit) < 0)
 371         return (-1);
 372     }
 373   return (str_length);
 374 }
 375
 376 /* Calculate a hash value for a string encoded in Utf8 format.
 377  * This returns the same hash value as specified or java.lang.String.hashCode.
 378  */
 379 jint
 380 _Jv_hashUtf8String (const char* str, int len)
 381 {
 382   unsigned char* ptr = (unsigned char*) str;
 383   unsigned char* limit = ptr + len;
 384   jint hash = 0;
 385
 386   for (; ptr < limit;)
 387     {
 388       int ch = UTF8_GET (ptr, limit);
 389       /* Updated specification from
 390          http://www.javasoft.com/docs/books/jls/clarify.html. */
 391       hash = (31 * hash) + ch;
 392     }
 393   return hash;
 394 }
 395
 396 void
 397 _Jv_Utf8Const::init(const char *s, int len)
 398 {
 399   ::memcpy (data, s, len);
 400   data[len] = 0;
 401   length = len;
 402   hash = _Jv_hashUtf8String (s, len) & 0xFFFF;
 403 }
 404
 405 _Jv_Utf8Const *
 406 _Jv_makeUtf8Const (const char* s, int len)
 407 {
 408   if (len < 0)
 409     len = strlen (s);
 410   Utf8Const* m
 411     = (Utf8Const*) _Jv_AllocBytes (_Jv_Utf8Const::space_needed(s, len));
 412   m->init(s, len);
 413   return m;
 414 }
 415
 416 _Jv_Utf8Const *
 417 _Jv_makeUtf8Const (jstring string)
 418 {
 419   jint hash = string->hashCode ();
 420   jint len = _Jv_GetStringUTFLength (string);
 421
 422   Utf8Const* m = (Utf8Const*)
 423     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 424
 425   m->hash = hash;
 426   m->length = len;
 427
 428   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 429   m->data[len] = 0;
 430
 431   return m;
 432 }
 433
 434 \f
 435
 436 #ifdef DEBUG
 437 void
 438 _Jv_Abort (const char *function, const char *file, int line,
 439            const char *message)
 440 #else
 441 void
 442 _Jv_Abort (const char *, const char *, int, const char *message)
 443 #endif
 444 {
 445 #ifdef DEBUG
 446   fprintf (stderr,
 447            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 448            message, function, file, line);
 449 #else
 450   fprintf (stderr, "libgcj failure: %s\n", message);
 451 #endif
 452   abort ();
 453 }
 454
 455 static void
 456 fail_on_finalization (jobject)
 457 {
 458   JvFail ("object was finalized");
 459 }
 460
 461 void
 462 _Jv_GCWatch (jobject obj)
 463 {
 464   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 465 }
 466
 467 void
 468 _Jv_ThrowBadArrayIndex(jint bad_index)
 469 {
 470   throw new java::lang::ArrayIndexOutOfBoundsException
 471     (java::lang::String::valueOf (bad_index));
 472 }
 473
 474 void
 475 _Jv_ThrowNullPointerException ()
 476 {
 477   throw new java::lang::NullPointerException;
 478 }
 479
 480 // Resolve an entry in the constant pool and return the target
 481 // address.
 482 void *
 483 _Jv_ResolvePoolEntry (jclass this_class, jint index)
 484 {
 485   _Jv_Constants *pool = &this_class->constants;
 486
 487   if ((pool->tags[index] & JV_CONSTANT_ResolvedFlag) != 0)
 488     return pool->data[index].field->u.addr;
 489
 490   JvSynchronize sync (this_class);
 491   return (_Jv_Linker::resolve_pool_entry (this_class, index))
 492     .field->u.addr;
 493 }
 494
 495
 496 // Explicitly throw a no memory exception.
 497 // The collector calls this when it encounters an out-of-memory condition.
 498 void _Jv_ThrowNoMemory()
 499 {
 500   throw no_memory;
 501 }
 502
 503 #ifdef ENABLE_JVMPI
 504 # define JVMPI_NOTIFY_ALLOC(klass,size,obj) \
 505     if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false)) \
 506       jvmpi_notify_alloc(klass,size,obj);
 507 static void
 508 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 509 {
 510   // Service JVMPI allocation request.
 511   JVMPI_Event event;
 512
 513   event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 514   event.env_id = NULL;
 515   event.u.obj_alloc.arena_id = 0;
 516   event.u.obj_alloc.class_id = (jobjectID) klass;
 517   event.u.obj_alloc.is_array = 0;
 518   event.u.obj_alloc.size = size;
 519   event.u.obj_alloc.obj_id = (jobjectID) obj;
 520
 521   // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 522   // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 523   // More importantly, I don't see the need for disabling GC, since we
 524   // blatantly have a pointer to obj on our stack, ensuring that the
 525   // object can't be collected.  Even for a nonconservative collector,
 526   // it appears to me that this must be true, since we are about to
 527   // return obj. Isn't this whole approach way too intrusive for
 528   // a useful profiling interface?                      - HB
 529   _Jv_DisableGC ();
 530   (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 531   _Jv_EnableGC ();
 532 }
 533 #else /* !ENABLE_JVMPI */
 534 # define JVMPI_NOTIFY_ALLOC(klass,size,obj) /* do nothing */
 535 #endif
 536
 537 // Allocate a new object of class KLASS.
 538 // First a version that assumes that we have no finalizer, and that
 539 // the class is already initialized.
 540 // If we know that JVMPI is disabled, this can be replaced by a direct call
 541 // to the allocator for the appropriate GC.
 542 jobject
 543 _Jv_AllocObjectNoInitNoFinalizer (jclass klass)
 544 {
 545   jint size = klass->size ();
 546   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 547   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 548   return obj;
 549 }
 550
 551 // And now a version that initializes if necessary.
 552 jobject
 553 _Jv_AllocObjectNoFinalizer (jclass klass)
 554 {
 555   if (_Jv_IsPhantomClass(klass) )
 556     throw new java::lang::NoClassDefFoundError(klass->getName());
 557
 558   _Jv_InitClass (klass);
 559   jint size = klass->size ();
 560   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 561   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 562   return obj;
 563 }
 564
 565 // And now the general version that registers a finalizer if necessary.
 566 jobject
 567 _Jv_AllocObject (jclass klass)
 568 {
 569   jobject obj = _Jv_AllocObjectNoFinalizer (klass);
 570
 571   // We assume that the compiler only generates calls to this routine
 572   // if there really is an interesting finalizer.
 573   // Unfortunately, we still have to the dynamic test, since there may
 574   // be cni calls to this routine.
 575   // Note that on IA64 get_finalizer() returns the starting address of the
 576   // function, not a function pointer.  Thus this still works.
 577   if (klass->vtable->get_finalizer ()
 578       != java::lang::Object::class$.vtable->get_finalizer ())
 579     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 580   return obj;
 581 }
 582
 583 // Allocate a String, including variable length storage.
 584 jstring
 585 _Jv_AllocString(jsize len)
 586 {
 587   using namespace java::lang;
 588
 589   jsize sz = sizeof(java::lang::String) + len * sizeof(jchar);
 590
 591   // We assert that for strings allocated this way, the data field
 592   // will always point to the object itself.  Thus there is no reason
 593   // for the garbage collector to scan any of it.
 594   // Furthermore, we're about to overwrite the string data, so
 595   // initialization of the object is not an issue.
 596
 597   // String needs no initialization, and there is no finalizer, so
 598   // we can go directly to the collector's allocator interface.
 599   jstring obj = (jstring) _Jv_AllocPtrFreeObj(sz, &String::class$);
 600
 601   obj->data = obj;
 602   obj->boffset = sizeof(java::lang::String);
 603   obj->count = len;
 604   obj->cachedHashCode = 0;
 605
 606   JVMPI_NOTIFY_ALLOC (&String::class$, sz, obj);
 607
 608   return obj;
 609 }
 610
 611 // A version of the above that assumes the object contains no pointers,
 612 // and requires no finalization.  This can't happen if we need pointers
 613 // to locks.
 614 #ifdef JV_HASH_SYNCHRONIZATION
 615 jobject
 616 _Jv_AllocPtrFreeObject (jclass klass)
 617 {
 618   _Jv_InitClass (klass);
 619   jint size = klass->size ();
 620
 621   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 622
 623   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 624
 625   return obj;
 626 }
 627 #endif /* JV_HASH_SYNCHRONIZATION */
 628
 629
 630 // Allocate a new array of Java objects.  Each object is of type
 631 // `elementClass'.  `init' is used to initialize each slot in the
 632 // array.
 633 jobjectArray
 634 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 635 {
 636   // Creating an array of an unresolved type is impossible. So we throw
 637   // the NoClassDefFoundError.
 638   if ( _Jv_IsPhantomClass(elementClass) )
 639     throw new java::lang::NoClassDefFoundError(elementClass->getName());
 640
 641   if (__builtin_expect (count < 0, false))
 642     throw new java::lang::NegativeArraySizeException;
 643
 644   JvAssert (! elementClass->isPrimitive ());
 645
 646   // Ensure that elements pointer is properly aligned.
 647   jobjectArray obj = NULL;
 648   size_t size = (size_t) elements (obj);
 649   // Check for overflow.
 650   if (__builtin_expect ((size_t) count >
 651                         (MAX_OBJECT_SIZE - 1 - size) / sizeof (jobject), false))
 652     throw no_memory;
 653
 654   size += count * sizeof (jobject);
 655
 656   jclass klass = _Jv_GetArrayClass (elementClass,
 657                                     elementClass->getClassLoaderInternal());
 658
 659   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 660   // Cast away const.
 661   jsize *lp = const_cast<jsize *> (&obj->length);
 662   *lp = count;
 663   // We know the allocator returns zeroed memory.  So don't bother
 664   // zeroing it again.
 665   if (init)
 666     {
 667       jobject *ptr = elements(obj);
 668       while (--count >= 0)
 669         *ptr++ = init;
 670     }
 671   return obj;
 672 }
 673
 674 // Allocate a new array of primitives.  ELTYPE is the type of the
 675 // element, COUNT is the size of the array.
 676 jobject
 677 _Jv_NewPrimArray (jclass eltype, jint count)
 678 {
 679   int elsize = eltype->size();
 680   if (__builtin_expect (count < 0, false))
 681     throw new java::lang::NegativeArraySizeException;
 682
 683   JvAssert (eltype->isPrimitive ());
 684   jobject dummy = NULL;
 685   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 686
 687   // Check for overflow.
 688   if (__builtin_expect ((size_t) count >
 689                         (MAX_OBJECT_SIZE - size) / elsize, false))
 690     throw no_memory;
 691
 692   jclass klass = _Jv_GetArrayClass (eltype, 0);
 693
 694 # ifdef JV_HASH_SYNCHRONIZATION
 695   // Since the vtable is always statically allocated,
 696   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 697   __JArray *arr =
 698     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 699   memset((char *)arr + size, 0, elsize * count);
 700 # else
 701   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 702   // Note that we assume we are given zeroed memory by the allocator.
 703 # endif
 704   // Cast away const.
 705   jsize *lp = const_cast<jsize *> (&arr->length);
 706   *lp = count;
 707
 708   return arr;
 709 }
 710
 711 jobject
 712 _Jv_NewArray (jint type, jint size)
 713 {
 714   switch (type)
 715     {
 716       case  4:  return JvNewBooleanArray (size);
 717       case  5:  return JvNewCharArray (size);
 718       case  6:  return JvNewFloatArray (size);
 719       case  7:  return JvNewDoubleArray (size);
 720       case  8:  return JvNewByteArray (size);
 721       case  9:  return JvNewShortArray (size);
 722       case 10:  return JvNewIntArray (size);
 723       case 11:  return JvNewLongArray (size);
 724     }
 725   throw new java::lang::InternalError
 726     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 727 }
 728
 729 // Allocate a possibly multi-dimensional array but don't check that
 730 // any array length is <0.
 731 static jobject
 732 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 733 {
 734   JvAssert (type->isArray());
 735   jclass element_type = type->getComponentType();
 736   jobject result;
 737   if (element_type->isPrimitive())
 738     result = _Jv_NewPrimArray (element_type, sizes[0]);
 739   else
 740     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 741
 742   if (dimensions > 1)
 743     {
 744       JvAssert (! element_type->isPrimitive());
 745       JvAssert (element_type->isArray());
 746       jobject *contents = elements ((jobjectArray) result);
 747       for (int i = 0; i < sizes[0]; ++i)
 748         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 749                                                   sizes + 1);
 750     }
 751
 752   return result;
 753 }
 754
 755 jobject
 756 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 757 {
 758   for (int i = 0; i < dimensions; ++i)
 759     if (sizes[i] < 0)
 760       throw new java::lang::NegativeArraySizeException;
 761
 762   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 763 }
 764
 765 jobject
 766 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 767 {
 768   // Creating an array of an unresolved type is impossible. So we throw
 769   // the NoClassDefFoundError.
 770   if (_Jv_IsPhantomClass(array_type))
 771     throw new java::lang::NoClassDefFoundError(array_type->getName());
 772
 773   va_list args;
 774   jint sizes[dimensions];
 775   va_start (args, dimensions);
 776   for (int i = 0; i < dimensions; ++i)
 777     {
 778       jint size = va_arg (args, jint);
 779       if (size < 0)
 780         throw new java::lang::NegativeArraySizeException;
 781       sizes[i] = size;
 782     }
 783   va_end (args);
 784
 785   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 786 }
 787
 788 \f
 789
 790 // Ensure 8-byte alignment, for hash synchronization.
 791 #define DECLARE_PRIM_TYPE(NAME)                 \
 792   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 793
 794 DECLARE_PRIM_TYPE(byte)
 795 DECLARE_PRIM_TYPE(short)
 796 DECLARE_PRIM_TYPE(int)
 797 DECLARE_PRIM_TYPE(long)
 798 DECLARE_PRIM_TYPE(boolean)
 799 DECLARE_PRIM_TYPE(char)
 800 DECLARE_PRIM_TYPE(float)
 801 DECLARE_PRIM_TYPE(double)
 802 DECLARE_PRIM_TYPE(void)
 803
 804 void
 805 _Jv_InitPrimClass (jclass cl, const char *cname, char sig, int len)
 806 {
 807   using namespace java::lang::reflect;
 808
 809   // We must set the vtable for the class; the Java constructor
 810   // doesn't do this.
 811   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 812
 813   // Initialize the fields we care about.  We do this in the same
 814   // order they are declared in Class.h.
 815   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 816   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 817   cl->method_count = sig;
 818   cl->size_in_bytes = len;
 819   cl->vtable = JV_PRIMITIVE_VTABLE;
 820   cl->state = JV_STATE_DONE;
 821   cl->depth = -1;
 822 }
 823
 824 jclass
 825 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader,
 826                             char **endp)
 827 {
 828   // First count arrays.
 829   int array_count = 0;
 830   while (*sig == '[')
 831     {
 832       ++sig;
 833       ++array_count;
 834     }
 835
 836   jclass result = NULL;
 837   switch (*sig)
 838     {
 839     case 'B':
 840       result = JvPrimClass (byte);
 841       break;
 842     case 'S':
 843       result = JvPrimClass (short);
 844       break;
 845     case 'I':
 846       result = JvPrimClass (int);
 847       break;
 848     case 'J':
 849       result = JvPrimClass (long);
 850       break;
 851     case 'Z':
 852       result = JvPrimClass (boolean);
 853       break;
 854     case 'C':
 855       result = JvPrimClass (char);
 856       break;
 857     case 'F':
 858       result = JvPrimClass (float);
 859       break;
 860     case 'D':
 861       result = JvPrimClass (double);
 862       break;
 863     case 'V':
 864       result = JvPrimClass (void);
 865       break;
 866     case 'L':
 867       {
 868         char *save = ++sig;
 869         while (*sig && *sig != ';')
 870           ++sig;
 871         // Do nothing if signature appears to be malformed.
 872         if (*sig == ';')
 873           {
 874             _Jv_Utf8Const *name = _Jv_makeUtf8Const (save, sig - save);
 875             result = _Jv_FindClass (name, loader);
 876           }
 877         break;
 878       }
 879     default:
 880       // Do nothing -- bad signature.
 881       break;
 882     }
 883
 884   if (endp)
 885     {
 886       // Not really the "end", but the last valid character that we
 887       // looked at.
 888       *endp = sig;
 889     }
 890
 891   if (! result)
 892     return NULL;
 893
 894   // Find arrays.
 895   while (array_count-- > 0)
 896     result = _Jv_GetArrayClass (result, loader);
 897   return result;
 898 }
 899
 900
 901 jclass
 902 _Jv_FindClassFromSignatureNoException (char *sig, java::lang::ClassLoader *loader,
 903                                        char **endp)
 904 {
 905   jclass klass;
 906
 907   try
 908     {
 909       klass = _Jv_FindClassFromSignature(sig, loader, endp);
 910     }
 911   catch (java::lang::NoClassDefFoundError *ncdfe)
 912     {
 913       return NULL;
 914     }
 915   catch (java::lang::ClassNotFoundException *cnfe)
 916     {
 917       return NULL;
 918     }
 919
 920   return klass;
 921 }
 922
 923 JArray<jstring> *
 924 JvConvertArgv (int argc, const char **argv)
 925 {
 926   if (argc < 0)
 927     argc = 0;
 928   jobjectArray ar = JvNewObjectArray(argc, &java::lang::String::class$, NULL);
 929   jobject *ptr = elements(ar);
 930   jbyteArray bytes = NULL;
 931   for (int i = 0;  i < argc;  i++)
 932     {
 933       const char *arg = argv[i];
 934       int len = strlen (arg);
 935       if (bytes == NULL || bytes->length < len)
 936         bytes = JvNewByteArray (len);
 937       jbyte *bytePtr = elements (bytes);
 938       // We assume jbyte == char.
 939       memcpy (bytePtr, arg, len);
 940
 941       // Now convert using the default encoding.
 942       *ptr++ = new java::lang::String (bytes, 0, len);
 943     }
 944   return (JArray<jstring>*) ar;
 945 }
 946
 947 // FIXME: These variables are static so that they will be
 948 // automatically scanned by the Boehm collector.  This is needed
 949 // because with qthreads the collector won't scan the initial stack --
 950 // it will only scan the qthreads stacks.
 951
 952 // Command line arguments.
 953 static JArray<jstring> *arg_vec;
 954
 955 // The primary thread.
 956 static java::lang::Thread *main_thread;
 957
 958 #ifndef DISABLE_GETENV_PROPERTIES
 959
 960 static char *
 961 next_property_key (char *s, size_t *length)
 962 {
 963   size_t l = 0;
 964
 965   JvAssert (s);
 966
 967   // Skip over whitespace
 968   while (isspace (*s))
 969     s++;
 970
 971   // If we've reached the end, return NULL.  Also return NULL if for
 972   // some reason we've come across a malformed property string.
 973   if (*s == 0
 974       || *s == ':'
 975       || *s == '=')
 976     return NULL;
 977
 978   // Determine the length of the property key.
 979   while (s[l] != 0
 980          && ! isspace (s[l])
 981          && s[l] != ':'
 982          && s[l] != '=')
 983     {
 984       if (s[l] == '\\'
 985           && s[l+1] != 0)
 986         l++;
 987       l++;
 988     }
 989
 990   *length = l;
 991
 992   return s;
 993 }
 994
 995 static char *
 996 next_property_value (char *s, size_t *length)
 997 {
 998   size_t l = 0;
 999
1000   JvAssert (s);
1001
1002   while (isspace (*s))
1003     s++;
1004
1005   if (*s == ':'
1006       || *s == '=')
1007     s++;
1008
1009   while (isspace (*s))
1010     s++;
1011
1012   // Determine the length of the property value.
1013   while (s[l] != 0
1014          && ! isspace (s[l])
1015          && s[l] != ':'
1016          && s[l] != '=')
1017     {
1018       if (s[l] == '\\'
1019           && s[l+1] != 0)
1020         l += 2;
1021       else
1022         l++;
1023     }
1024
1025   *length = l;
1026
1027   return s;
1028 }
1029
1030 static void
1031 process_gcj_properties ()
1032 {
1033   char *props = getenv("GCJ_PROPERTIES");
1034
1035   if (NULL == props)
1036     return;
1037
1038   // Later on we will write \0s into this string.  It is simplest to
1039   // just duplicate it here.
1040   props = strdup (props);
1041
1042   char *p = props;
1043   size_t length;
1044   size_t property_count = 0;
1045
1046   // Whip through props quickly in order to count the number of
1047   // property values.
1048   while (p && (p = next_property_key (p, &length)))
1049     {
1050       // Skip to the end of the key
1051       p += length;
1052
1053       p = next_property_value (p, &length);
1054       if (p)
1055         p += length;
1056
1057       property_count++;
1058     }
1059
1060   // Allocate an array of property value/key pairs.
1061   _Jv_Environment_Properties =
1062     (property_pair *) malloc (sizeof(property_pair)
1063                               * (property_count + 1));
1064
1065   // Go through the properties again, initializing _Jv_Properties
1066   // along the way.
1067   p = props;
1068   property_count = 0;
1069   while (p && (p = next_property_key (p, &length)))
1070     {
1071       _Jv_Environment_Properties[property_count].key = p;
1072       _Jv_Environment_Properties[property_count].key_length = length;
1073
1074       // Skip to the end of the key
1075       p += length;
1076
1077       p = next_property_value (p, &length);
1078
1079       _Jv_Environment_Properties[property_count].value = p;
1080       _Jv_Environment_Properties[property_count].value_length = length;
1081
1082       if (p)
1083         p += length;
1084
1085       property_count++;
1086     }
1087   memset ((void *) &_Jv_Environment_Properties[property_count],
1088           0, sizeof (property_pair));
1089
1090   // Null terminate the strings.
1091   for (property_pair *prop = &_Jv_Environment_Properties[0];
1092        prop->key != NULL;
1093        prop++)
1094     {
1095       prop->key[prop->key_length] = 0;
1096       prop->value[prop->value_length] = 0;
1097     }
1098 }
1099 #endif // DISABLE_GETENV_PROPERTIES
1100
1101 namespace gcj
1102 {
1103   _Jv_Utf8Const *void_signature;
1104   _Jv_Utf8Const *clinit_name;
1105   _Jv_Utf8Const *init_name;
1106   _Jv_Utf8Const *finit_name;
1107
1108   bool runtimeInitialized = false;
1109
1110   // When true, print debugging information about class loading.
1111   bool verbose_class_flag;
1112
1113   // When true, enable the bytecode verifier and BC-ABI type verification.
1114   bool verifyClasses = true;
1115
1116   // Thread stack size specified by the -Xss runtime argument.
1117   size_t stack_size = 0;
1118 }
1119
1120 // We accept all non-standard options accepted by Sun's java command,
1121 // for compatibility with existing application launch scripts.
1122 static jint
1123 parse_x_arg (char* option_string)
1124 {
1125   if (strlen (option_string) <= 0)
1126     return -1;
1127
1128   if (! strcmp (option_string, "int"))
1129     {
1130       // FIXME: this should cause the vm to never load shared objects
1131     }
1132   else if (! strcmp (option_string, "mixed"))
1133     {
1134       // FIXME: allow interpreted and native code
1135     }
1136   else if (! strcmp (option_string, "batch"))
1137     {
1138       // FIXME: disable background JIT'ing
1139     }
1140   else if (! strcmp (option_string, "debug"))
1141     {
1142       // FIXME: add JDWP/JVMDI support
1143     }
1144   else if (! strncmp (option_string, "bootclasspath:", 14))
1145     {
1146       // FIXME: add a parse_bootclasspath_arg function
1147     }
1148   else if (! strncmp (option_string, "bootclasspath/a:", 16))
1149     {
1150     }
1151   else if (! strncmp (option_string, "bootclasspath/p:", 16))
1152     {
1153     }
1154   else if (! strcmp (option_string, "check:jni"))
1155     {
1156       // FIXME: enable strict JNI checking
1157     }
1158   else if (! strcmp (option_string, "future"))
1159     {
1160       // FIXME: enable strict class file format checks
1161     }
1162   else if (! strcmp (option_string, "noclassgc"))
1163     {
1164       // FIXME: disable garbage collection for classes
1165     }
1166   else if (! strcmp (option_string, "incgc"))
1167     {
1168       // FIXME: incremental garbage collection
1169     }
1170   else if (! strncmp (option_string, "loggc:", 6))
1171     {
1172       if (option_string[6] == '\0')
1173         {
1174           fprintf (stderr,
1175                    "libgcj: filename argument expected for loggc option\n");
1176           return -1;
1177         }
1178       // FIXME: set gc logging filename
1179     }
1180   else if (! strncmp (option_string, "ms", 2))
1181     {
1182       // FIXME: ignore this option until PR 20699 is fixed.
1183       // _Jv_SetInitialHeapSize (option_string + 2);
1184     }
1185   else if (! strncmp (option_string, "mx", 2))
1186     _Jv_SetMaximumHeapSize (option_string + 2);
1187   else if (! strcmp (option_string, "prof"))
1188     {
1189       // FIXME: enable profiling of program running in vm
1190     }
1191   else if (! strncmp (option_string, "runhprof:", 9))
1192     {
1193       // FIXME: enable specific type of vm profiling.  add a
1194       // parse_runhprof_arg function
1195     }
1196   else if (! strcmp (option_string, "rs"))
1197     {
1198       // FIXME: reduced system signal usage.  disable thread dumps,
1199       // only terminate in response to user-initiated calls,
1200       // e.g. System.exit()
1201     }
1202   else if (! strncmp (option_string, "ss", 2))
1203     {
1204       _Jv_SetStackSize (option_string + 2);
1205     }
1206   else if (! strcmp (option_string, "X:+UseAltSigs"))
1207     {
1208       // FIXME: use signals other than SIGUSR1 and SIGUSR2
1209     }
1210   else if (! strcmp (option_string, "share:off"))
1211     {
1212       // FIXME: don't share class data
1213     }
1214   else if (! strcmp (option_string, "share:auto"))
1215     {
1216       // FIXME: share class data where possible
1217     }
1218   else if (! strcmp (option_string, "share:on"))
1219     {
1220       // FIXME: fail if impossible to share class data
1221     }
1222
1223   return 0;
1224 }
1225
1226 static jint
1227 parse_verbose_args (char* option_string,
1228                     bool ignore_unrecognized)
1229 {
1230   size_t len = sizeof ("-verbose") - 1;
1231
1232   if (strlen (option_string) < len)
1233     return -1;
1234
1235   if (option_string[len] == ':'
1236       && option_string[len + 1] != '\0')
1237     {
1238       char* verbose_args = option_string + len + 1;
1239
1240       do
1241         {
1242           if (! strncmp (verbose_args,
1243                          "gc", sizeof ("gc") - 1))
1244             {
1245               if (verbose_args[sizeof ("gc") - 1] == '\0'
1246                   || verbose_args[sizeof ("gc") - 1] == ',')
1247                 {
1248                   // FIXME: we should add functions to boehm-gc that
1249                   // toggle GC_print_stats, GC_PRINT_ADDRESS_MAP and
1250                   // GC_print_back_height.
1251                   verbose_args += sizeof ("gc") - 1;
1252                 }
1253               else
1254                 {
1255                 verbose_arg_err:
1256                   fprintf (stderr, "libgcj: unknown verbose option: %s\n",
1257                            option_string);
1258                   return -1;
1259                 }
1260             }
1261           else if (! strncmp (verbose_args,
1262                               "class",
1263                               sizeof ("class") - 1))
1264             {
1265               if (verbose_args[sizeof ("class") - 1] == '\0'
1266                   || verbose_args[sizeof ("class") - 1] == ',')
1267                 {
1268                   gcj::verbose_class_flag = true;
1269                   verbose_args += sizeof ("class") - 1;
1270                 }
1271               else
1272                 goto verbose_arg_err;
1273             }
1274           else if (! strncmp (verbose_args, "jni",
1275                               sizeof ("jni") - 1))
1276             {
1277               if (verbose_args[sizeof ("jni") - 1] == '\0'
1278                   || verbose_args[sizeof ("jni") - 1] == ',')
1279                 {
1280                   // FIXME: enable JNI messages.
1281                   verbose_args += sizeof ("jni") - 1;
1282                 }
1283               else
1284                 goto verbose_arg_err;
1285             }
1286           else if (ignore_unrecognized
1287                    && verbose_args[0] == 'X')
1288             {
1289               // ignore unrecognized non-standard verbose option
1290               while (verbose_args[0] != '\0'
1291                      && verbose_args[0] != ',')
1292                 verbose_args++;
1293             }
1294           else if (verbose_args[0] == ',')
1295             {
1296               verbose_args++;
1297             }
1298           else
1299             goto verbose_arg_err;
1300
1301           if (verbose_args[0] == ',')
1302             verbose_args++;
1303         }
1304       while (verbose_args[0] != '\0');
1305     }
1306   else if (option_string[len] == 'g'
1307            && option_string[len + 1] == 'c'
1308            && option_string[len + 2] == '\0')
1309     {
1310       // FIXME: we should add functions to boehm-gc that
1311       // toggle GC_print_stats, GC_PRINT_ADDRESS_MAP and
1312       // GC_print_back_height.
1313       return 0;
1314     }
1315   else if (option_string[len] == '\0')
1316     {
1317       gcj::verbose_class_flag = true;
1318       return 0;
1319     }
1320   else
1321     {
1322       // unrecognized option beginning with -verbose
1323       return -1;
1324     }
1325   return 0;
1326 }
1327
1328 static jint
1329 parse_init_args (JvVMInitArgs* vm_args)
1330 {
1331   // if _Jv_Compiler_Properties is non-NULL then it needs to be
1332   // re-allocated dynamically.
1333   if (_Jv_Compiler_Properties)
1334     {
1335       const char** props = _Jv_Compiler_Properties;
1336       _Jv_Compiler_Properties = NULL;
1337
1338       for (int i = 0; props[i]; i++)
1339         {
1340           _Jv_Compiler_Properties = (const char**) _Jv_Realloc
1341             (_Jv_Compiler_Properties,
1342              (_Jv_Properties_Count + 1) * sizeof (const char*));
1343           _Jv_Compiler_Properties[_Jv_Properties_Count++] = props[i];
1344         }
1345     }
1346
1347   if (vm_args == NULL)
1348     return 0;
1349
1350   for (int i = 0; i < vm_args->nOptions; ++i)
1351     {
1352       char* option_string = vm_args->options[i].optionString;
1353       if (! strcmp (option_string, "vfprintf")
1354           || ! strcmp (option_string, "exit")
1355           || ! strcmp (option_string, "abort"))
1356         {
1357           // FIXME: we are required to recognize these, but for
1358           // now we don't handle them in any way.
1359           continue;
1360         }
1361       else if (! strncmp (option_string,
1362                           "-verbose", sizeof ("-verbose") - 1))
1363         {
1364           jint result = parse_verbose_args (option_string,
1365                                             vm_args->ignoreUnrecognized);
1366           if (result < 0)
1367             return result;
1368         }
1369       else if (! strncmp (option_string, "-D", 2))
1370         {
1371           _Jv_Compiler_Properties = (const char**) _Jv_Realloc
1372             (_Jv_Compiler_Properties,
1373              (_Jv_Properties_Count + 1) * sizeof (char*));
1374
1375           _Jv_Compiler_Properties[_Jv_Properties_Count++] =
1376             strdup (option_string + 2);
1377
1378           continue;
1379         }
1380       else if (vm_args->ignoreUnrecognized)
1381         {
1382           if (option_string[0] == '_')
1383             parse_x_arg (option_string + 1);
1384           else if (! strncmp (option_string, "-X", 2))
1385             parse_x_arg (option_string + 2);
1386           else
1387             {
1388             unknown_option:
1389               fprintf (stderr, "libgcj: unknown option: %s\n", option_string);
1390               return -1;
1391             }
1392         }
1393       else
1394         goto unknown_option;
1395     }
1396   return 0;
1397 }
1398
1399 jint
1400 _Jv_CreateJavaVM (JvVMInitArgs* vm_args)
1401 {
1402   using namespace gcj;
1403
1404   if (runtimeInitialized)
1405     return -1;
1406
1407   runtimeInitialized = true;
1408
1409   jint result = parse_init_args (vm_args);
1410   if (result < 0)
1411     return -1;
1412
1413   PROCESS_GCJ_PROPERTIES;
1414
1415   /* Threads must be initialized before the GC, so that it inherits the
1416      signal mask.  */
1417   _Jv_InitThreads ();
1418   _Jv_InitGC ();
1419   _Jv_InitializeSyncMutex ();
1420
1421 #ifdef INTERPRETER
1422   _Jv_InitInterpreter ();
1423 #endif
1424
1425 #ifdef HANDLE_SEGV
1426   INIT_SEGV;
1427 #endif
1428
1429 #ifdef HANDLE_FPE
1430   INIT_FPE;
1431 #endif
1432
1433   /* Initialize Utf8 constants declared in jvm.h. */
1434   void_signature = _Jv_makeUtf8Const ("()V", 3);
1435   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
1436   init_name = _Jv_makeUtf8Const ("<init>", 6);
1437   finit_name = _Jv_makeUtf8Const ("finit$", 6);
1438
1439   /* Initialize built-in classes to represent primitive TYPEs. */
1440   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1);
1441   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2);
1442   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4);
1443   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8);
1444   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1);
1445   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2);
1446   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4);
1447   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8);
1448   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0);
1449
1450   // Turn stack trace generation off while creating exception objects.
1451   _Jv_InitClass (&java::lang::VMThrowable::class$);
1452   java::lang::VMThrowable::trace_enabled = 0;
1453
1454   // We have to initialize this fairly early, to avoid circular class
1455   // initialization.  In particular we want to start the
1456   // initialization of ClassLoader before we start the initialization
1457   // of VMClassLoader.
1458   _Jv_InitClass (&java::lang::ClassLoader::class$);
1459
1460   // Set up the system class loader and the bootstrap class loader.
1461   gnu::gcj::runtime::ExtensionClassLoader::initialize();
1462   java::lang::VMClassLoader::initialize(JvNewStringLatin1(TOOLEXECLIBDIR));
1463
1464   _Jv_RegisterBootstrapPackages();
1465
1466   no_memory = new java::lang::OutOfMemoryError;
1467
1468   java::lang::VMThrowable::trace_enabled = 1;
1469
1470 #ifdef USE_LTDL
1471   LTDL_SET_PRELOADED_SYMBOLS ();
1472 #endif
1473
1474   _Jv_platform_initialize ();
1475
1476   _Jv_JNI_Init ();
1477
1478   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
1479
1480   // Start the GC finalizer thread.  A VirtualMachineError can be
1481   // thrown by the runtime if, say, threads aren't available.
1482   try
1483     {
1484       using namespace gnu::gcj::runtime;
1485       FinalizerThread *ft = new FinalizerThread ();
1486       ft->start ();
1487     }
1488   catch (java::lang::VirtualMachineError *ignore)
1489     {
1490     }
1491
1492   return 0;
1493 }
1494
1495 void
1496 _Jv_RunMain (JvVMInitArgs *vm_args, jclass klass, const char *name, int argc,
1497              const char **argv, bool is_jar)
1498 {
1499 #ifndef DISABLE_MAIN_ARGS
1500   _Jv_SetArgs (argc, argv);
1501 #endif
1502
1503   java::lang::Runtime *runtime = NULL;
1504
1505   try
1506     {
1507       if (_Jv_CreateJavaVM (vm_args) < 0)
1508         {
1509           fprintf (stderr, "libgcj: couldn't create virtual machine\n");
1510           exit (1);
1511         }
1512
1513       // Get the Runtime here.  We want to initialize it before searching
1514       // for `main'; that way it will be set up if `main' is a JNI method.
1515       runtime = java::lang::Runtime::getRuntime ();
1516
1517 #ifdef DISABLE_MAIN_ARGS
1518       arg_vec = JvConvertArgv (0, 0);
1519 #else
1520       arg_vec = JvConvertArgv (argc - 1, argv + 1);
1521 #endif
1522
1523       using namespace gnu::java::lang;
1524       if (klass)
1525         main_thread = new MainThread (klass, arg_vec);
1526       else
1527         main_thread = new MainThread (JvNewStringLatin1 (name),
1528                                       arg_vec, is_jar);
1529     }
1530   catch (java::lang::Throwable *t)
1531     {
1532       java::lang::System::err->println (JvNewStringLatin1
1533         ("Exception during runtime initialization"));
1534       t->printStackTrace();
1535       if (runtime)
1536         java::lang::Runtime::exitNoChecksAccessor (1);
1537       // In case the runtime creation failed.
1538       ::exit (1);
1539     }
1540
1541   _Jv_AttachCurrentThread (main_thread);
1542   _Jv_ThreadRun (main_thread);
1543
1544   // If we got here then something went wrong, as MainThread is not
1545   // supposed to terminate.
1546   ::exit (1);
1547 }
1548
1549 void
1550 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
1551              bool is_jar)
1552 {
1553   _Jv_RunMain (NULL, klass, name, argc, argv, is_jar);
1554 }
1555
1556 void
1557 JvRunMain (jclass klass, int argc, const char **argv)
1558 {
1559   _Jv_RunMain (klass, NULL, argc, argv, false);
1560 }
1561
1562 \f
1563
1564 // Parse a string and return a heap size.
1565 static size_t
1566 parse_memory_size (const char *spec)
1567 {
1568   char *end;
1569   unsigned long val = strtoul (spec, &end, 10);
1570   if (*end == 'k' || *end == 'K')
1571     val *= 1024;
1572   else if (*end == 'm' || *end == 'M')
1573     val *= 1048576;
1574   return (size_t) val;
1575 }
1576
1577 // Set the initial heap size.  This might be ignored by the GC layer.
1578 // This must be called before _Jv_RunMain.
1579 void
1580 _Jv_SetInitialHeapSize (const char *arg)
1581 {
1582   size_t size = parse_memory_size (arg);
1583   _Jv_GCSetInitialHeapSize (size);
1584 }
1585
1586 // Set the maximum heap size.  This might be ignored by the GC layer.
1587 // This must be called before _Jv_RunMain.
1588 void
1589 _Jv_SetMaximumHeapSize (const char *arg)
1590 {
1591   size_t size = parse_memory_size (arg);
1592   _Jv_GCSetMaximumHeapSize (size);
1593 }
1594
1595 void
1596 _Jv_SetStackSize (const char *arg)
1597 {
1598   size_t size = parse_memory_size (arg);
1599   gcj::stack_size = size;
1600 }
1601
1602 void *
1603 _Jv_Malloc (jsize size)
1604 {
1605   if (__builtin_expect (size == 0, false))
1606     size = 1;
1607   void *ptr = malloc ((size_t) size);
1608   if (__builtin_expect (ptr == NULL, false))
1609     throw no_memory;
1610   return ptr;
1611 }
1612
1613 void *
1614 _Jv_Realloc (void *ptr, jsize size)
1615 {
1616   if (__builtin_expect (size == 0, false))
1617     size = 1;
1618   ptr = realloc (ptr, (size_t) size);
1619   if (__builtin_expect (ptr == NULL, false))
1620     throw no_memory;
1621   return ptr;
1622 }
1623
1624 void *
1625 _Jv_MallocUnchecked (jsize size)
1626 {
1627   if (__builtin_expect (size == 0, false))
1628     size = 1;
1629   return malloc ((size_t) size);
1630 }
1631
1632 void
1633 _Jv_Free (void* ptr)
1634 {
1635   return free (ptr);
1636 }
1637
1638 \f
1639
1640 // In theory, these routines can be #ifdef'd away on machines which
1641 // support divide overflow signals.  However, we never know if some
1642 // code might have been compiled with "-fuse-divide-subroutine", so we
1643 // always include them in libgcj.
1644
1645 jint
1646 _Jv_divI (jint dividend, jint divisor)
1647 {
1648   if (__builtin_expect (divisor == 0, false))
1649     {
1650       java::lang::ArithmeticException *arithexception
1651         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1652       throw arithexception;
1653     }
1654
1655   if (dividend == (jint) 0x80000000L && divisor == -1)
1656     return dividend;
1657
1658   return dividend / divisor;
1659 }
1660
1661 jint
1662 _Jv_remI (jint dividend, jint divisor)
1663 {
1664   if (__builtin_expect (divisor == 0, false))
1665     {
1666       java::lang::ArithmeticException *arithexception
1667         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1668       throw arithexception;
1669     }
1670
1671   if (dividend == (jint) 0x80000000L && divisor == -1)
1672     return 0;
1673
1674   return dividend % divisor;
1675 }
1676
1677 jlong
1678 _Jv_divJ (jlong dividend, jlong divisor)
1679 {
1680   if (__builtin_expect (divisor == 0, false))
1681     {
1682       java::lang::ArithmeticException *arithexception
1683         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1684       throw arithexception;
1685     }
1686
1687   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1688     return dividend;
1689
1690   return dividend / divisor;
1691 }
1692
1693 jlong
1694 _Jv_remJ (jlong dividend, jlong divisor)
1695 {
1696   if (__builtin_expect (divisor == 0, false))
1697     {
1698       java::lang::ArithmeticException *arithexception
1699         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1700       throw arithexception;
1701     }
1702
1703   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1704     return 0;
1705
1706   return dividend % divisor;
1707 }
1708
1709 \f
1710
1711 // Return true if SELF_KLASS can access a field or method in
1712 // OTHER_KLASS.  The field or method's access flags are specified in
1713 // FLAGS.
1714 jboolean
1715 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1716 {
1717   using namespace java::lang::reflect;
1718   return ((self_klass == other_klass)
1719           || ((flags & Modifier::PUBLIC) != 0)
1720           || (((flags & Modifier::PROTECTED) != 0)
1721               && _Jv_IsAssignableFromSlow (self_klass, other_klass))
1722           || (((flags & Modifier::PRIVATE) == 0)
1723               && _Jv_ClassNameSamePackage (self_klass->name,
1724                                            other_klass->name)));
1725 }
1726
1727 // Prepend GCJ_VERSIONED_LIBDIR to a module search path stored in a C
1728 // char array, if the path is not already prefixed by
1729 // GCJ_VERSIONED_LIBDIR.  Return a newly JvMalloc'd char buffer.  The
1730 // result should be freed using JvFree.
1731 char*
1732 _Jv_PrependVersionedLibdir (char* libpath)
1733 {
1734   char* retval = 0;
1735
1736   if (libpath && libpath[0] != '\0')
1737     {
1738       if (! strncmp (libpath,
1739                      GCJ_VERSIONED_LIBDIR,
1740                      sizeof (GCJ_VERSIONED_LIBDIR) - 1))
1741         {
1742           // LD_LIBRARY_PATH is already prefixed with
1743           // GCJ_VERSIONED_LIBDIR.
1744           retval = (char*) _Jv_Malloc (strlen (libpath) + 1);
1745           strcpy (retval, libpath);
1746         }
1747       else
1748         {
1749           // LD_LIBRARY_PATH is not prefixed with
1750           // GCJ_VERSIONED_LIBDIR.
1751           jsize total = (sizeof (GCJ_VERSIONED_LIBDIR) - 1)
1752             + (sizeof (PATH_SEPARATOR) - 1) + strlen (libpath) + 1;
1753           retval = (char*) _Jv_Malloc (total);
1754           strcpy (retval, GCJ_VERSIONED_LIBDIR);
1755           strcat (retval, PATH_SEPARATOR);
1756           strcat (retval, libpath);
1757         }
1758     }
1759   else
1760     {
1761       // LD_LIBRARY_PATH was not specified or is empty.
1762       retval = (char*) _Jv_Malloc (sizeof (GCJ_VERSIONED_LIBDIR));
1763       strcpy (retval, GCJ_VERSIONED_LIBDIR);
1764     }
1765
1766   return retval;
1767 }