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