toolchain/gcc/libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004  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 <gnu/gcj/runtime/FirstThread.h>
  65
  66 #ifdef USE_LTDL
  67 #include <ltdl.h>
  68 #endif
  69
  70 // We allocate a single OutOfMemoryError exception which we keep
  71 // around for use if we run out of memory.
  72 static java::lang::OutOfMemoryError *no_memory;
  73
  74 // Number of bytes in largest array object we create.  This could be
  75 // increased to the largest size_t value, so long as the appropriate
  76 // functions are changed to take a size_t argument instead of jint.
  77 #define MAX_OBJECT_SIZE ((1<<31) - 1)
  78
  79 static const char *no_properties[] = { NULL };
  80
  81 // Properties set at compile time.
  82 const char **_Jv_Compiler_Properties = no_properties;
  83
  84 // The JAR file to add to the beginning of java.class.path.
  85 const char *_Jv_Jar_Class_Path;
  86
  87 #ifndef DISABLE_GETENV_PROPERTIES
  88 // Property key/value pairs.
  89 property_pair *_Jv_Environment_Properties;
  90 #endif
  91
  92 // Stash the argv pointer to benefit native libraries that need it.
  93 const char **_Jv_argv;
  94 int _Jv_argc;
  95
  96 // Argument support.
  97 int
  98 _Jv_GetNbArgs (void)
  99 {
 100   // _Jv_argc is 0 if not explicitly initialized.
 101   return _Jv_argc;
 102 }
 103
 104 const char *
 105 _Jv_GetSafeArg (int index)
 106 {
 107   if (index >=0 && index < _Jv_GetNbArgs ())
 108     return _Jv_argv[index];
 109   else
 110     return "";
 111 }
 112
 113 void
 114 _Jv_SetArgs (int argc, const char **argv)
 115 {
 116   _Jv_argc = argc;
 117   _Jv_argv = argv;
 118 }
 119
 120 #ifdef ENABLE_JVMPI
 121 // Pointer to JVMPI notification functions.
 122 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 123 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 124 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 125 #endif
 126 \f
 127
 128 /* Unblock a signal.  Unless we do this, the signal may only be sent
 129    once.  */
 130 static void
 131 unblock_signal (int signum)
 132 {
 133 #ifdef _POSIX_VERSION
 134   sigset_t sigs;
 135
 136   sigemptyset (&sigs);
 137   sigaddset (&sigs, signum);
 138   sigprocmask (SIG_UNBLOCK, &sigs, NULL);
 139 #endif
 140 }
 141
 142 #ifdef HANDLE_SEGV
 143 SIGNAL_HANDLER (catch_segv)
 144 {
 145   java::lang::NullPointerException *nullp
 146     = new java::lang::NullPointerException;
 147   unblock_signal (SIGSEGV);
 148   MAKE_THROW_FRAME (nullp);
 149   throw nullp;
 150 }
 151 #endif
 152
 153 #ifdef HANDLE_FPE
 154 SIGNAL_HANDLER (catch_fpe)
 155 {
 156   java::lang::ArithmeticException *arithexception
 157     = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
 158   unblock_signal (SIGFPE);
 159 #ifdef HANDLE_DIVIDE_OVERFLOW
 160   HANDLE_DIVIDE_OVERFLOW;
 161 #else
 162   MAKE_THROW_FRAME (arithexception);
 163 #endif
 164   throw arithexception;
 165 }
 166 #endif
 167
 168 \f
 169
 170 jboolean
 171 _Jv_equalUtf8Consts (const Utf8Const* a, const Utf8Const *b)
 172 {
 173   int len;
 174   const _Jv_ushort *aptr, *bptr;
 175   if (a == b)
 176     return true;
 177   if (a->hash != b->hash)
 178     return false;
 179   len = a->length;
 180   if (b->length != len)
 181     return false;
 182   aptr = (const _Jv_ushort *)a->data;
 183   bptr = (const _Jv_ushort *)b->data;
 184   len = (len + 1) >> 1;
 185   while (--len >= 0)
 186     if (*aptr++ != *bptr++)
 187       return false;
 188   return true;
 189 }
 190
 191 /* True iff A is equal to STR.
 192    HASH is STR->hashCode().
 193 */
 194
 195 jboolean
 196 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 197 {
 198   if (a->hash != (_Jv_ushort) hash)
 199     return false;
 200   jint len = str->length();
 201   jint i = 0;
 202   jchar *sptr = _Jv_GetStringChars (str);
 203   unsigned char* ptr = (unsigned char*) a->data;
 204   unsigned char* limit = ptr + a->length;
 205   for (;; i++, sptr++)
 206     {
 207       int ch = UTF8_GET (ptr, limit);
 208       if (i == len)
 209         return ch < 0;
 210       if (ch != *sptr)
 211         return false;
 212     }
 213   return true;
 214 }
 215
 216 /* Like _Jv_equal, but stop after N characters.  */
 217 jboolean
 218 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 219 {
 220   jint len = str->length();
 221   jint i = 0;
 222   jchar *sptr = _Jv_GetStringChars (str);
 223   unsigned char* ptr = (unsigned char*) a->data;
 224   unsigned char* limit = ptr + a->length;
 225   for (; n-- > 0; i++, sptr++)
 226     {
 227       int ch = UTF8_GET (ptr, limit);
 228       if (i == len)
 229         return ch < 0;
 230       if (ch != *sptr)
 231         return false;
 232     }
 233   return true;
 234 }
 235
 236 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 237 int
 238 _Jv_strLengthUtf8(char* str, int len)
 239 {
 240   unsigned char* ptr;
 241   unsigned char* limit;
 242   int str_length;
 243
 244   ptr = (unsigned char*) str;
 245   limit = ptr + len;
 246   str_length = 0;
 247   for (; ptr < limit; str_length++)
 248     {
 249       if (UTF8_GET (ptr, limit) < 0)
 250         return (-1);
 251     }
 252   return (str_length);
 253 }
 254
 255 /* Calculate a hash value for a string encoded in Utf8 format.
 256  * This returns the same hash value as specified or java.lang.String.hashCode.
 257  */
 258 static jint
 259 hashUtf8String (char* str, int len)
 260 {
 261   unsigned char* ptr = (unsigned char*) str;
 262   unsigned char* limit = ptr + len;
 263   jint hash = 0;
 264
 265   for (; ptr < limit;)
 266     {
 267       int ch = UTF8_GET (ptr, limit);
 268       /* Updated specification from
 269          http://www.javasoft.com/docs/books/jls/clarify.html. */
 270       hash = (31 * hash) + ch;
 271     }
 272   return hash;
 273 }
 274
 275 _Jv_Utf8Const *
 276 _Jv_makeUtf8Const (char* s, int len)
 277 {
 278   if (len < 0)
 279     len = strlen (s);
 280   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 281   memcpy (m->data, s, len);
 282   m->data[len] = 0;
 283   m->length = len;
 284   m->hash = hashUtf8String (s, len) & 0xFFFF;
 285   return (m);
 286 }
 287
 288 _Jv_Utf8Const *
 289 _Jv_makeUtf8Const (jstring string)
 290 {
 291   jint hash = string->hashCode ();
 292   jint len = _Jv_GetStringUTFLength (string);
 293
 294   Utf8Const* m = (Utf8Const*)
 295     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 296
 297   m->hash = hash;
 298   m->length = len;
 299
 300   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 301   m->data[len] = 0;
 302
 303   return m;
 304 }
 305
 306 \f
 307
 308 #ifdef DEBUG
 309 void
 310 _Jv_Abort (const char *function, const char *file, int line,
 311            const char *message)
 312 #else
 313 void
 314 _Jv_Abort (const char *, const char *, int, const char *message)
 315 #endif
 316 {
 317 #ifdef DEBUG
 318   fprintf (stderr,
 319            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 320            message, function, file, line);
 321 #else
 322   fprintf (stderr, "libgcj failure: %s\n", message);
 323 #endif
 324   abort ();
 325 }
 326
 327 static void
 328 fail_on_finalization (jobject)
 329 {
 330   JvFail ("object was finalized");
 331 }
 332
 333 void
 334 _Jv_GCWatch (jobject obj)
 335 {
 336   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 337 }
 338
 339 void
 340 _Jv_ThrowBadArrayIndex(jint bad_index)
 341 {
 342   throw new java::lang::ArrayIndexOutOfBoundsException
 343     (java::lang::String::valueOf (bad_index));
 344 }
 345
 346 void
 347 _Jv_ThrowNullPointerException ()
 348 {
 349   throw new java::lang::NullPointerException;
 350 }
 351
 352 // Explicitly throw a no memory exception.
 353 // The collector calls this when it encounters an out-of-memory condition.
 354 void _Jv_ThrowNoMemory()
 355 {
 356   throw no_memory;
 357 }
 358
 359 #ifdef ENABLE_JVMPI
 360 static void
 361 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 362 {
 363   // Service JVMPI allocation request.
 364   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 365     {
 366       JVMPI_Event event;
 367
 368       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 369       event.env_id = NULL;
 370       event.u.obj_alloc.arena_id = 0;
 371       event.u.obj_alloc.class_id = (jobjectID) klass;
 372       event.u.obj_alloc.is_array = 0;
 373       event.u.obj_alloc.size = size;
 374       event.u.obj_alloc.obj_id = (jobjectID) obj;
 375
 376       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 377       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 378       // More importantly, I don't see the need for disabling GC, since we
 379       // blatantly have a pointer to obj on our stack, ensuring that the
 380       // object can't be collected.  Even for a nonconservative collector,
 381       // it appears to me that this must be true, since we are about to
 382       // return obj. Isn't this whole approach way too intrusive for
 383       // a useful profiling interface?                  - HB
 384       _Jv_DisableGC ();
 385       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 386       _Jv_EnableGC ();
 387     }
 388 }
 389 #else /* !ENABLE_JVMPI */
 390 # define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 391 #endif
 392
 393 // Allocate a new object of class KLASS.  SIZE is the size of the object
 394 // to allocate.  You might think this is redundant, but it isn't; some
 395 // classes, such as String, aren't of fixed size.
 396 // First a version that assumes that we have no finalizer, and that
 397 // the class is already initialized.
 398 // If we know that JVMPI is disabled, this can be replaced by a direct call
 399 // to the allocator for the appropriate GC.
 400 jobject
 401 _Jv_AllocObjectNoInitNoFinalizer (jclass klass, jint size)
 402 {
 403   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 404   jvmpi_notify_alloc (klass, size, obj);
 405   return obj;
 406 }
 407
 408 // And now a version that initializes if necessary.
 409 jobject
 410 _Jv_AllocObjectNoFinalizer (jclass klass, jint size)
 411 {
 412   _Jv_InitClass (klass);
 413   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 414   jvmpi_notify_alloc (klass, size, obj);
 415   return obj;
 416 }
 417
 418 // And now the general version that registers a finalizer if necessary.
 419 jobject
 420 _Jv_AllocObject (jclass klass, jint size)
 421 {
 422   jobject obj = _Jv_AllocObjectNoFinalizer (klass, size);
 423
 424   // We assume that the compiler only generates calls to this routine
 425   // if there really is an interesting finalizer.
 426   // Unfortunately, we still have to the dynamic test, since there may
 427   // be cni calls to this routine.
 428   // Note that on IA64 get_finalizer() returns the starting address of the
 429   // function, not a function pointer.  Thus this still works.
 430   if (klass->vtable->get_finalizer ()
 431       != java::lang::Object::class$.vtable->get_finalizer ())
 432     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 433   return obj;
 434 }
 435
 436 // A version of the above that assumes the object contains no pointers,
 437 // and requires no finalization.  This can't happen if we need pointers
 438 // to locks.
 439 #ifdef JV_HASH_SYNCHRONIZATION
 440 jobject
 441 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 442 {
 443   _Jv_InitClass (klass);
 444
 445   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 446
 447 #ifdef ENABLE_JVMPI
 448   // Service JVMPI request.
 449
 450   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 451     {
 452       JVMPI_Event event;
 453
 454       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 455       event.env_id = NULL;
 456       event.u.obj_alloc.arena_id = 0;
 457       event.u.obj_alloc.class_id = (jobjectID) klass;
 458       event.u.obj_alloc.is_array = 0;
 459       event.u.obj_alloc.size = size;
 460       event.u.obj_alloc.obj_id = (jobjectID) obj;
 461
 462       _Jv_DisableGC ();
 463       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 464       _Jv_EnableGC ();
 465     }
 466 #endif
 467
 468   return obj;
 469 }
 470 #endif /* JV_HASH_SYNCHRONIZATION */
 471
 472
 473 // Allocate a new array of Java objects.  Each object is of type
 474 // `elementClass'.  `init' is used to initialize each slot in the
 475 // array.
 476 jobjectArray
 477 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 478 {
 479   if (__builtin_expect (count < 0, false))
 480     throw new java::lang::NegativeArraySizeException;
 481
 482   JvAssert (! elementClass->isPrimitive ());
 483
 484   // Ensure that elements pointer is properly aligned.
 485   jobjectArray obj = NULL;
 486   size_t size = (size_t) elements (obj);
 487   // Check for overflow.
 488   if (__builtin_expect ((size_t) count >
 489                         (MAX_OBJECT_SIZE - 1 - size) / sizeof (jobject), false))
 490     throw no_memory;
 491
 492   size += count * sizeof (jobject);
 493
 494   jclass klass = _Jv_GetArrayClass (elementClass,
 495                                     elementClass->getClassLoaderInternal());
 496
 497   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 498   // Cast away const.
 499   jsize *lp = const_cast<jsize *> (&obj->length);
 500   *lp = count;
 501   // We know the allocator returns zeroed memory.  So don't bother
 502   // zeroing it again.
 503   if (init)
 504     {
 505       jobject *ptr = elements(obj);
 506       while (--count >= 0)
 507         *ptr++ = init;
 508     }
 509   return obj;
 510 }
 511
 512 // Allocate a new array of primitives.  ELTYPE is the type of the
 513 // element, COUNT is the size of the array.
 514 jobject
 515 _Jv_NewPrimArray (jclass eltype, jint count)
 516 {
 517   int elsize = eltype->size();
 518   if (__builtin_expect (count < 0, false))
 519     throw new java::lang::NegativeArraySizeException;
 520
 521   JvAssert (eltype->isPrimitive ());
 522   jobject dummy = NULL;
 523   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 524
 525   // Check for overflow.
 526   if (__builtin_expect ((size_t) count >
 527                         (MAX_OBJECT_SIZE - size) / elsize, false))
 528     throw no_memory;
 529
 530   jclass klass = _Jv_GetArrayClass (eltype, 0);
 531
 532 # ifdef JV_HASH_SYNCHRONIZATION
 533   // Since the vtable is always statically allocated,
 534   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 535   __JArray *arr =
 536     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 537   memset((char *)arr + size, 0, elsize * count);
 538 # else
 539   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 540   // Note that we assume we are given zeroed memory by the allocator.
 541 # endif
 542   // Cast away const.
 543   jsize *lp = const_cast<jsize *> (&arr->length);
 544   *lp = count;
 545
 546   return arr;
 547 }
 548
 549 jobject
 550 _Jv_NewArray (jint type, jint size)
 551 {
 552   switch (type)
 553     {
 554       case  4:  return JvNewBooleanArray (size);
 555       case  5:  return JvNewCharArray (size);
 556       case  6:  return JvNewFloatArray (size);
 557       case  7:  return JvNewDoubleArray (size);
 558       case  8:  return JvNewByteArray (size);
 559       case  9:  return JvNewShortArray (size);
 560       case 10:  return JvNewIntArray (size);
 561       case 11:  return JvNewLongArray (size);
 562     }
 563   throw new java::lang::InternalError
 564     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 565 }
 566
 567 // Allocate a possibly multi-dimensional array but don't check that
 568 // any array length is <0.
 569 static jobject
 570 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 571 {
 572   JvAssert (type->isArray());
 573   jclass element_type = type->getComponentType();
 574   jobject result;
 575   if (element_type->isPrimitive())
 576     result = _Jv_NewPrimArray (element_type, sizes[0]);
 577   else
 578     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 579
 580   if (dimensions > 1)
 581     {
 582       JvAssert (! element_type->isPrimitive());
 583       JvAssert (element_type->isArray());
 584       jobject *contents = elements ((jobjectArray) result);
 585       for (int i = 0; i < sizes[0]; ++i)
 586         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 587                                                   sizes + 1);
 588     }
 589
 590   return result;
 591 }
 592
 593 jobject
 594 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 595 {
 596   for (int i = 0; i < dimensions; ++i)
 597     if (sizes[i] < 0)
 598       throw new java::lang::NegativeArraySizeException;
 599
 600   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 601 }
 602
 603 jobject
 604 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 605 {
 606   va_list args;
 607   jint sizes[dimensions];
 608   va_start (args, dimensions);
 609   for (int i = 0; i < dimensions; ++i)
 610     {
 611       jint size = va_arg (args, jint);
 612       if (size < 0)
 613         throw new java::lang::NegativeArraySizeException;
 614       sizes[i] = size;
 615     }
 616   va_end (args);
 617
 618   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 619 }
 620
 621 \f
 622
 623 // Ensure 8-byte alignment, for hash synchronization.
 624 #define DECLARE_PRIM_TYPE(NAME)                 \
 625   _Jv_ArrayVTable _Jv_##NAME##VTable;           \
 626   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 627
 628 DECLARE_PRIM_TYPE(byte)
 629 DECLARE_PRIM_TYPE(short)
 630 DECLARE_PRIM_TYPE(int)
 631 DECLARE_PRIM_TYPE(long)
 632 DECLARE_PRIM_TYPE(boolean)
 633 DECLARE_PRIM_TYPE(char)
 634 DECLARE_PRIM_TYPE(float)
 635 DECLARE_PRIM_TYPE(double)
 636 DECLARE_PRIM_TYPE(void)
 637
 638 void
 639 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len,
 640                    _Jv_ArrayVTable *array_vtable)
 641 {
 642   using namespace java::lang::reflect;
 643
 644   // We must set the vtable for the class; the Java constructor
 645   // doesn't do this.
 646   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 647
 648   // Initialize the fields we care about.  We do this in the same
 649   // order they are declared in Class.h.
 650   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 651   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 652   cl->method_count = sig;
 653   cl->size_in_bytes = len;
 654   cl->vtable = JV_PRIMITIVE_VTABLE;
 655   cl->state = JV_STATE_DONE;
 656   cl->depth = -1;
 657   if (sig != 'V')
 658     _Jv_NewArrayClass (cl, NULL, (_Jv_VTable *) array_vtable);
 659 }
 660
 661 jclass
 662 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 663 {
 664   switch (*sig)
 665     {
 666     case 'B':
 667       return JvPrimClass (byte);
 668     case 'S':
 669       return JvPrimClass (short);
 670     case 'I':
 671       return JvPrimClass (int);
 672     case 'J':
 673       return JvPrimClass (long);
 674     case 'Z':
 675       return JvPrimClass (boolean);
 676     case 'C':
 677       return JvPrimClass (char);
 678     case 'F':
 679       return JvPrimClass (float);
 680     case 'D':
 681       return JvPrimClass (double);
 682     case 'V':
 683       return JvPrimClass (void);
 684     case 'L':
 685       {
 686         int i;
 687         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 688           ;
 689         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 690         return _Jv_FindClass (name, loader);
 691       }
 692     case '[':
 693       {
 694         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 695         if (! klass)
 696           return NULL;
 697         return _Jv_GetArrayClass (klass, loader);
 698       }
 699     }
 700
 701   return NULL;                  // Placate compiler.
 702 }
 703
 704 \f
 705
 706 JArray<jstring> *
 707 JvConvertArgv (int argc, const char **argv)
 708 {
 709   if (argc < 0)
 710     argc = 0;
 711   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 712   jobject *ptr = elements(ar);
 713   jbyteArray bytes = NULL;
 714   for (int i = 0;  i < argc;  i++)
 715     {
 716       const char *arg = argv[i];
 717       int len = strlen (arg);
 718       if (bytes == NULL || bytes->length < len)
 719         bytes = JvNewByteArray (len);
 720       jbyte *bytePtr = elements (bytes);
 721       // We assume jbyte == char.
 722       memcpy (bytePtr, arg, len);
 723
 724       // Now convert using the default encoding.
 725       *ptr++ = new java::lang::String (bytes, 0, len);
 726     }
 727   return (JArray<jstring>*) ar;
 728 }
 729
 730 // FIXME: These variables are static so that they will be
 731 // automatically scanned by the Boehm collector.  This is needed
 732 // because with qthreads the collector won't scan the initial stack --
 733 // it will only scan the qthreads stacks.
 734
 735 // Command line arguments.
 736 static JArray<jstring> *arg_vec;
 737
 738 // The primary thread.
 739 static java::lang::Thread *main_thread;
 740
 741 #ifndef DISABLE_GETENV_PROPERTIES
 742
 743 static char *
 744 next_property_key (char *s, size_t *length)
 745 {
 746   size_t l = 0;
 747
 748   JvAssert (s);
 749
 750   // Skip over whitespace
 751   while (isspace (*s))
 752     s++;
 753
 754   // If we've reached the end, return NULL.  Also return NULL if for
 755   // some reason we've come across a malformed property string.
 756   if (*s == 0
 757       || *s == ':'
 758       || *s == '=')
 759     return NULL;
 760
 761   // Determine the length of the property key.
 762   while (s[l] != 0
 763          && ! isspace (s[l])
 764          && s[l] != ':'
 765          && s[l] != '=')
 766     {
 767       if (s[l] == '\\'
 768           && s[l+1] != 0)
 769         l++;
 770       l++;
 771     }
 772
 773   *length = l;
 774
 775   return s;
 776 }
 777
 778 static char *
 779 next_property_value (char *s, size_t *length)
 780 {
 781   size_t l = 0;
 782
 783   JvAssert (s);
 784
 785   while (isspace (*s))
 786     s++;
 787
 788   if (*s == ':'
 789       || *s == '=')
 790     s++;
 791
 792   while (isspace (*s))
 793     s++;
 794
 795   // If we've reached the end, return NULL.
 796   if (*s == 0)
 797     return NULL;
 798
 799   // Determine the length of the property value.
 800   while (s[l] != 0
 801          && ! isspace (s[l])
 802          && s[l] != ':'
 803          && s[l] != '=')
 804     {
 805       if (s[l] == '\\'
 806           && s[l+1] != 0)
 807         l += 2;
 808       else
 809         l++;
 810     }
 811
 812   *length = l;
 813
 814   return s;
 815 }
 816
 817 static void
 818 process_gcj_properties ()
 819 {
 820   char *props = getenv("GCJ_PROPERTIES");
 821   char *p = props;
 822   size_t length;
 823   size_t property_count = 0;
 824
 825   if (NULL == props)
 826     return;
 827
 828   // Whip through props quickly in order to count the number of
 829   // property values.
 830   while (p && (p = next_property_key (p, &length)))
 831     {
 832       // Skip to the end of the key
 833       p += length;
 834
 835       p = next_property_value (p, &length);
 836       if (p)
 837         p += length;
 838
 839       property_count++;
 840     }
 841
 842   // Allocate an array of property value/key pairs.
 843   _Jv_Environment_Properties =
 844     (property_pair *) malloc (sizeof(property_pair)
 845                               * (property_count + 1));
 846
 847   // Go through the properties again, initializing _Jv_Properties
 848   // along the way.
 849   p = props;
 850   property_count = 0;
 851   while (p && (p = next_property_key (p, &length)))
 852     {
 853       _Jv_Environment_Properties[property_count].key = p;
 854       _Jv_Environment_Properties[property_count].key_length = length;
 855
 856       // Skip to the end of the key
 857       p += length;
 858
 859       p = next_property_value (p, &length);
 860
 861       _Jv_Environment_Properties[property_count].value = p;
 862       _Jv_Environment_Properties[property_count].value_length = length;
 863
 864       if (p)
 865         p += length;
 866
 867       property_count++;
 868     }
 869   memset ((void *) &_Jv_Environment_Properties[property_count],
 870           0, sizeof (property_pair));
 871   {
 872     size_t i = 0;
 873
 874     // Null terminate the strings.
 875     while (_Jv_Environment_Properties[i].key)
 876       {
 877         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 878         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 879       }
 880   }
 881 }
 882 #endif // DISABLE_GETENV_PROPERTIES
 883
 884 namespace gcj
 885 {
 886   _Jv_Utf8Const *void_signature;
 887   _Jv_Utf8Const *clinit_name;
 888   _Jv_Utf8Const *init_name;
 889   _Jv_Utf8Const *finit_name;
 890
 891   bool runtimeInitialized = false;
 892 }
 893
 894 jint
 895 _Jv_CreateJavaVM (void* /*vm_args*/)
 896 {
 897   using namespace gcj;
 898
 899   if (runtimeInitialized)
 900     return -1;
 901
 902   runtimeInitialized = true;
 903
 904   PROCESS_GCJ_PROPERTIES;
 905
 906   _Jv_InitThreads ();
 907   _Jv_InitGC ();
 908   _Jv_InitializeSyncMutex ();
 909
 910 #ifdef INTERPRETER
 911   _Jv_InitInterpreter ();
 912 #endif
 913
 914   /* Initialize Utf8 constants declared in jvm.h. */
 915   void_signature = _Jv_makeUtf8Const ("()V", 3);
 916   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 917   init_name = _Jv_makeUtf8Const ("<init>", 6);
 918   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 919
 920   /* Initialize built-in classes to represent primitive TYPEs. */
 921   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1, &_Jv_byteVTable);
 922   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2, &_Jv_shortVTable);
 923   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4, &_Jv_intVTable);
 924   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8, &_Jv_longVTable);
 925   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1, &_Jv_booleanVTable);
 926   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2, &_Jv_charVTable);
 927   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4, &_Jv_floatVTable);
 928   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8, &_Jv_doubleVTable);
 929   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0, &_Jv_voidVTable);
 930
 931   // Turn stack trace generation off while creating exception objects.
 932   _Jv_InitClass (&java::lang::VMThrowable::class$);
 933   java::lang::VMThrowable::trace_enabled = 0;
 934
 935   // We have to initialize this fairly early, to avoid circular class
 936   // initialization.  In particular we want to start the
 937   // initialization of ClassLoader before we start the initialization
 938   // of VMClassLoader.
 939   _Jv_InitClass (&java::lang::ClassLoader::class$);
 940   // Once the bootstrap loader is in place, change it into a kind of
 941   // system loader, by having it read the class path.
 942   gnu::gcj::runtime::VMClassLoader::initialize();
 943
 944   INIT_SEGV;
 945 #ifdef HANDLE_FPE
 946   INIT_FPE;
 947 #endif
 948
 949   no_memory = new java::lang::OutOfMemoryError;
 950
 951   java::lang::VMThrowable::trace_enabled = 1;
 952
 953 #ifdef USE_LTDL
 954   LTDL_SET_PRELOADED_SYMBOLS ();
 955 #endif
 956
 957   _Jv_platform_initialize ();
 958
 959   _Jv_JNI_Init ();
 960
 961   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
 962
 963   // Start the GC finalizer thread.  A VirtualMachineError can be
 964   // thrown by the runtime if, say, threads aren't available.
 965   try
 966     {
 967       using namespace gnu::gcj::runtime;
 968       FinalizerThread *ft = new FinalizerThread ();
 969       ft->start ();
 970     }
 971   catch (java::lang::VirtualMachineError *ignore)
 972     {
 973     }
 974
 975   return 0;
 976 }
 977
 978 void
 979 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 980              bool is_jar)
 981 {
 982   _Jv_SetArgs (argc, argv);
 983
 984   java::lang::Runtime *runtime = NULL;
 985
 986   try
 987     {
 988       // Set this very early so that it is seen when java.lang.System
 989       // is initialized.
 990       if (is_jar)
 991         _Jv_Jar_Class_Path = strdup (name);
 992       _Jv_CreateJavaVM (NULL);
 993
 994       // Get the Runtime here.  We want to initialize it before searching
 995       // for `main'; that way it will be set up if `main' is a JNI method.
 996       runtime = java::lang::Runtime::getRuntime ();
 997
 998 #ifdef DISABLE_MAIN_ARGS
 999       arg_vec = JvConvertArgv (0, 0);
1000 #else
1001       arg_vec = JvConvertArgv (argc - 1, argv + 1);
1002 #endif
1003
1004       using namespace gnu::gcj::runtime;
1005       if (klass)
1006         main_thread = new FirstThread (klass, arg_vec);
1007       else
1008         main_thread = new FirstThread (JvNewStringLatin1 (name),
1009                                        arg_vec, is_jar);
1010     }
1011   catch (java::lang::Throwable *t)
1012     {
1013       java::lang::System::err->println (JvNewStringLatin1
1014         ("Exception during runtime initialization"));
1015       t->printStackTrace();
1016       runtime->exit (1);
1017     }
1018
1019   _Jv_AttachCurrentThread (main_thread);
1020   _Jv_ThreadRun (main_thread);
1021   _Jv_ThreadWait ();
1022
1023   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1024   runtime->exit (status);
1025 }
1026
1027 void
1028 JvRunMain (jclass klass, int argc, const char **argv)
1029 {
1030   _Jv_RunMain (klass, NULL, argc, argv, false);
1031 }
1032
1033 \f
1034
1035 // Parse a string and return a heap size.
1036 static size_t
1037 parse_heap_size (const char *spec)
1038 {
1039   char *end;
1040   unsigned long val = strtoul (spec, &end, 10);
1041   if (*end == 'k' || *end == 'K')
1042     val *= 1024;
1043   else if (*end == 'm' || *end == 'M')
1044     val *= 1048576;
1045   return (size_t) val;
1046 }
1047
1048 // Set the initial heap size.  This might be ignored by the GC layer.
1049 // This must be called before _Jv_RunMain.
1050 void
1051 _Jv_SetInitialHeapSize (const char *arg)
1052 {
1053   size_t size = parse_heap_size (arg);
1054   _Jv_GCSetInitialHeapSize (size);
1055 }
1056
1057 // Set the maximum heap size.  This might be ignored by the GC layer.
1058 // This must be called before _Jv_RunMain.
1059 void
1060 _Jv_SetMaximumHeapSize (const char *arg)
1061 {
1062   size_t size = parse_heap_size (arg);
1063   _Jv_GCSetMaximumHeapSize (size);
1064 }
1065
1066 \f
1067
1068 void *
1069 _Jv_Malloc (jsize size)
1070 {
1071   if (__builtin_expect (size == 0, false))
1072     size = 1;
1073   void *ptr = malloc ((size_t) size);
1074   if (__builtin_expect (ptr == NULL, false))
1075     throw no_memory;
1076   return ptr;
1077 }
1078
1079 void *
1080 _Jv_Realloc (void *ptr, jsize size)
1081 {
1082   if (__builtin_expect (size == 0, false))
1083     size = 1;
1084   ptr = realloc (ptr, (size_t) size);
1085   if (__builtin_expect (ptr == NULL, false))
1086     throw no_memory;
1087   return ptr;
1088 }
1089
1090 void *
1091 _Jv_MallocUnchecked (jsize size)
1092 {
1093   if (__builtin_expect (size == 0, false))
1094     size = 1;
1095   return malloc ((size_t) size);
1096 }
1097
1098 void
1099 _Jv_Free (void* ptr)
1100 {
1101   return free (ptr);
1102 }
1103
1104 \f
1105
1106 // In theory, these routines can be #ifdef'd away on machines which
1107 // support divide overflow signals.  However, we never know if some
1108 // code might have been compiled with "-fuse-divide-subroutine", so we
1109 // always include them in libgcj.
1110
1111 jint
1112 _Jv_divI (jint dividend, jint divisor)
1113 {
1114   if (__builtin_expect (divisor == 0, false))
1115     {
1116       java::lang::ArithmeticException *arithexception
1117         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1118       throw arithexception;
1119     }
1120
1121   if (dividend == (jint) 0x80000000L && divisor == -1)
1122     return dividend;
1123
1124   return dividend / divisor;
1125 }
1126
1127 jint
1128 _Jv_remI (jint dividend, jint divisor)
1129 {
1130   if (__builtin_expect (divisor == 0, false))
1131     {
1132       java::lang::ArithmeticException *arithexception
1133         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1134       throw arithexception;
1135     }
1136
1137   if (dividend == (jint) 0x80000000L && divisor == -1)
1138     return 0;
1139
1140   return dividend % divisor;
1141 }
1142
1143 jlong
1144 _Jv_divJ (jlong dividend, jlong divisor)
1145 {
1146   if (__builtin_expect (divisor == 0, false))
1147     {
1148       java::lang::ArithmeticException *arithexception
1149         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1150       throw arithexception;
1151     }
1152
1153   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1154     return dividend;
1155
1156   return dividend / divisor;
1157 }
1158
1159 jlong
1160 _Jv_remJ (jlong dividend, jlong divisor)
1161 {
1162   if (__builtin_expect (divisor == 0, false))
1163     {
1164       java::lang::ArithmeticException *arithexception
1165         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1166       throw arithexception;
1167     }
1168
1169   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1170     return 0;
1171
1172   return dividend % divisor;
1173 }
1174
1175 \f
1176
1177 // Return true if SELF_KLASS can access a field or method in
1178 // OTHER_KLASS.  The field or method's access flags are specified in
1179 // FLAGS.
1180 jboolean
1181 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1182 {
1183   using namespace java::lang::reflect;
1184   return ((self_klass == other_klass)
1185           || ((flags & Modifier::PUBLIC) != 0)
1186           || (((flags & Modifier::PROTECTED) != 0)
1187               && other_klass->isAssignableFrom (self_klass))
1188           || (((flags & Modifier::PRIVATE) == 0)
1189               && _Jv_ClassNameSamePackage (self_klass->name,
1190                                            other_klass->name)));
1191 }