libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003  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
  29 #ifdef ENABLE_JVMPI
  30 #include <jvmpi.h>
  31 #include <java/lang/ThreadGroup.h>
  32 #endif
  33
  34 #ifndef DISABLE_GETENV_PROPERTIES
  35 #include <ctype.h>
  36 #include <java-props.h>
  37 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  38 #else
  39 #define PROCESS_GCJ_PROPERTIES
  40 #endif // DISABLE_GETENV_PROPERTIES
  41
  42 #include <java/lang/Class.h>
  43 #include <java/lang/ClassLoader.h>
  44 #include <java/lang/Runtime.h>
  45 #include <java/lang/String.h>
  46 #include <java/lang/Thread.h>
  47 #include <java/lang/ThreadGroup.h>
  48 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  49 #include <java/lang/ArithmeticException.h>
  50 #include <java/lang/ClassFormatError.h>
  51 #include <java/lang/InternalError.h>
  52 #include <java/lang/NegativeArraySizeException.h>
  53 #include <java/lang/NullPointerException.h>
  54 #include <java/lang/OutOfMemoryError.h>
  55 #include <java/lang/System.h>
  56 #include <java/lang/VMThrowable.h>
  57 #include <java/lang/reflect/Modifier.h>
  58 #include <java/io/PrintStream.h>
  59 #include <java/lang/UnsatisfiedLinkError.h>
  60 #include <java/lang/VirtualMachineError.h>
  61 #include <gnu/gcj/runtime/VMClassLoader.h>
  62 #include <gnu/gcj/runtime/FinalizerThread.h>
  63 #include <gnu/gcj/runtime/FirstThread.h>
  64
  65 #ifdef USE_LTDL
  66 #include <ltdl.h>
  67 #endif
  68
  69 // We allocate a single OutOfMemoryError exception which we keep
  70 // around for use if we run out of memory.
  71 static java::lang::OutOfMemoryError *no_memory;
  72
  73 // Largest representable size_t.
  74 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  75
  76 static const char *no_properties[] = { NULL };
  77
  78 // Properties set at compile time.
  79 const char **_Jv_Compiler_Properties = no_properties;
  80
  81 // The JAR file to add to the beginning of java.class.path.
  82 const char *_Jv_Jar_Class_Path;
  83
  84 #ifndef DISABLE_GETENV_PROPERTIES
  85 // Property key/value pairs.
  86 property_pair *_Jv_Environment_Properties;
  87 #endif
  88
  89 // Stash the argv pointer to benefit native libraries that need it.
  90 const char **_Jv_argv;
  91 int _Jv_argc;
  92
  93 // Argument support.
  94 int
  95 _Jv_GetNbArgs (void)
  96 {
  97   // _Jv_argc is 0 if not explicitly initialized.
  98   return _Jv_argc;
  99 }
 100
 101 const char *
 102 _Jv_GetSafeArg (int index)
 103 {
 104   if (index >=0 && index < _Jv_GetNbArgs ())
 105     return _Jv_argv[index];
 106   else
 107     return "";
 108 }
 109
 110 void
 111 _Jv_SetArgs (int argc, const char **argv)
 112 {
 113   _Jv_argc = argc;
 114   _Jv_argv = argv;
 115 }
 116
 117 #ifdef ENABLE_JVMPI
 118 // Pointer to JVMPI notification functions.
 119 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 120 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 121 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 122 #endif
 123 \f
 124
 125 /* Unblock a signal.  Unless we do this, the signal may only be sent
 126    once.  */
 127 static void
 128 unblock_signal (int signum)
 129 {
 130 #ifdef _POSIX_VERSION
 131   sigset_t sigs;
 132
 133   sigemptyset (&sigs);
 134   sigaddset (&sigs, signum);
 135   sigprocmask (SIG_UNBLOCK, &sigs, NULL);
 136 #endif
 137 }
 138
 139 #ifdef HANDLE_SEGV
 140 SIGNAL_HANDLER (catch_segv)
 141 {
 142   java::lang::NullPointerException *nullp
 143     = new java::lang::NullPointerException;
 144   unblock_signal (SIGSEGV);
 145   MAKE_THROW_FRAME (nullp);
 146   throw nullp;
 147 }
 148 #endif
 149
 150 #ifdef HANDLE_FPE
 151 SIGNAL_HANDLER (catch_fpe)
 152 {
 153   java::lang::ArithmeticException *arithexception
 154     = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
 155   unblock_signal (SIGFPE);
 156 #ifdef HANDLE_DIVIDE_OVERFLOW
 157   HANDLE_DIVIDE_OVERFLOW;
 158 #else
 159   MAKE_THROW_FRAME (arithexception);
 160 #endif
 161   throw arithexception;
 162 }
 163 #endif
 164
 165 \f
 166
 167 jboolean
 168 _Jv_equalUtf8Consts (const Utf8Const* a, const Utf8Const *b)
 169 {
 170   int len;
 171   const _Jv_ushort *aptr, *bptr;
 172   if (a == b)
 173     return true;
 174   if (a->hash != b->hash)
 175     return false;
 176   len = a->length;
 177   if (b->length != len)
 178     return false;
 179   aptr = (const _Jv_ushort *)a->data;
 180   bptr = (const _Jv_ushort *)b->data;
 181   len = (len + 1) >> 1;
 182   while (--len >= 0)
 183     if (*aptr++ != *bptr++)
 184       return false;
 185   return true;
 186 }
 187
 188 /* True iff A is equal to STR.
 189    HASH is STR->hashCode().
 190 */
 191
 192 jboolean
 193 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 194 {
 195   if (a->hash != (_Jv_ushort) hash)
 196     return false;
 197   jint len = str->length();
 198   jint i = 0;
 199   jchar *sptr = _Jv_GetStringChars (str);
 200   unsigned char* ptr = (unsigned char*) a->data;
 201   unsigned char* limit = ptr + a->length;
 202   for (;; i++, sptr++)
 203     {
 204       int ch = UTF8_GET (ptr, limit);
 205       if (i == len)
 206         return ch < 0;
 207       if (ch != *sptr)
 208         return false;
 209     }
 210   return true;
 211 }
 212
 213 /* Like _Jv_equal, but stop after N characters.  */
 214 jboolean
 215 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 216 {
 217   jint len = str->length();
 218   jint i = 0;
 219   jchar *sptr = _Jv_GetStringChars (str);
 220   unsigned char* ptr = (unsigned char*) a->data;
 221   unsigned char* limit = ptr + a->length;
 222   for (; n-- > 0; i++, sptr++)
 223     {
 224       int ch = UTF8_GET (ptr, limit);
 225       if (i == len)
 226         return ch < 0;
 227       if (ch != *sptr)
 228         return false;
 229     }
 230   return true;
 231 }
 232
 233 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 234 int
 235 _Jv_strLengthUtf8(char* str, int len)
 236 {
 237   unsigned char* ptr;
 238   unsigned char* limit;
 239   int str_length;
 240
 241   ptr = (unsigned char*) str;
 242   limit = ptr + len;
 243   str_length = 0;
 244   for (; ptr < limit; str_length++)
 245     {
 246       if (UTF8_GET (ptr, limit) < 0)
 247         return (-1);
 248     }
 249   return (str_length);
 250 }
 251
 252 /* Calculate a hash value for a string encoded in Utf8 format.
 253  * This returns the same hash value as specified or java.lang.String.hashCode.
 254  */
 255 static jint
 256 hashUtf8String (char* str, int len)
 257 {
 258   unsigned char* ptr = (unsigned char*) str;
 259   unsigned char* limit = ptr + len;
 260   jint hash = 0;
 261
 262   for (; ptr < limit;)
 263     {
 264       int ch = UTF8_GET (ptr, limit);
 265       /* Updated specification from
 266          http://www.javasoft.com/docs/books/jls/clarify.html. */
 267       hash = (31 * hash) + ch;
 268     }
 269   return hash;
 270 }
 271
 272 _Jv_Utf8Const *
 273 _Jv_makeUtf8Const (char* s, int len)
 274 {
 275   if (len < 0)
 276     len = strlen (s);
 277   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 278   memcpy (m->data, s, len);
 279   m->data[len] = 0;
 280   m->length = len;
 281   m->hash = hashUtf8String (s, len) & 0xFFFF;
 282   return (m);
 283 }
 284
 285 _Jv_Utf8Const *
 286 _Jv_makeUtf8Const (jstring string)
 287 {
 288   jint hash = string->hashCode ();
 289   jint len = _Jv_GetStringUTFLength (string);
 290
 291   Utf8Const* m = (Utf8Const*)
 292     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 293
 294   m->hash = hash;
 295   m->length = len;
 296
 297   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 298   m->data[len] = 0;
 299
 300   return m;
 301 }
 302
 303 \f
 304
 305 #ifdef DEBUG
 306 void
 307 _Jv_Abort (const char *function, const char *file, int line,
 308            const char *message)
 309 #else
 310 void
 311 _Jv_Abort (const char *, const char *, int, const char *message)
 312 #endif
 313 {
 314 #ifdef DEBUG
 315   fprintf (stderr,
 316            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 317            message, function, file, line);
 318 #else
 319   fprintf (stderr, "libgcj failure: %s\n", message);
 320 #endif
 321   abort ();
 322 }
 323
 324 static void
 325 fail_on_finalization (jobject)
 326 {
 327   JvFail ("object was finalized");
 328 }
 329
 330 void
 331 _Jv_GCWatch (jobject obj)
 332 {
 333   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 334 }
 335
 336 void
 337 _Jv_ThrowBadArrayIndex(jint bad_index)
 338 {
 339   throw new java::lang::ArrayIndexOutOfBoundsException
 340     (java::lang::String::valueOf (bad_index));
 341 }
 342
 343 void
 344 _Jv_ThrowNullPointerException ()
 345 {
 346   throw new java::lang::NullPointerException;
 347 }
 348
 349 // Explicitly throw a no memory exception.
 350 // The collector calls this when it encounters an out-of-memory condition.
 351 void _Jv_ThrowNoMemory()
 352 {
 353   throw no_memory;
 354 }
 355
 356 #ifdef ENABLE_JVMPI
 357 static void
 358 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 359 {
 360   // Service JVMPI allocation request.
 361   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 362     {
 363       JVMPI_Event event;
 364
 365       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 366       event.env_id = NULL;
 367       event.u.obj_alloc.arena_id = 0;
 368       event.u.obj_alloc.class_id = (jobjectID) klass;
 369       event.u.obj_alloc.is_array = 0;
 370       event.u.obj_alloc.size = size;
 371       event.u.obj_alloc.obj_id = (jobjectID) obj;
 372
 373       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 374       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 375       // More importantly, I don't see the need for disabling GC, since we
 376       // blatantly have a pointer to obj on our stack, ensuring that the
 377       // object can't be collected.  Even for a nonconservative collector,
 378       // it appears to me that this must be true, since we are about to
 379       // return obj. Isn't this whole approach way too intrusive for
 380       // a useful profiling interface?                  - HB
 381       _Jv_DisableGC ();
 382       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 383       _Jv_EnableGC ();
 384     }
 385 }
 386 #else /* !ENABLE_JVMPI */
 387 # define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 388 #endif
 389
 390 // Allocate a new object of class KLASS.  SIZE is the size of the object
 391 // to allocate.  You might think this is redundant, but it isn't; some
 392 // classes, such as String, aren't of fixed size.
 393 // First a version that assumes that we have no finalizer, and that
 394 // the class is already initialized.
 395 // If we know that JVMPI is disabled, this can be replaced by a direct call
 396 // to the allocator for the appropriate GC.
 397 jobject
 398 _Jv_AllocObjectNoInitNoFinalizer (jclass klass, jint size)
 399 {
 400   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 401   jvmpi_notify_alloc (klass, size, obj);
 402   return obj;
 403 }
 404
 405 // And now a version that initializes if necessary.
 406 jobject
 407 _Jv_AllocObjectNoFinalizer (jclass klass, jint size)
 408 {
 409   _Jv_InitClass (klass);
 410   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 411   jvmpi_notify_alloc (klass, size, obj);
 412   return obj;
 413 }
 414
 415 // And now the general version that registers a finalizer if necessary.
 416 jobject
 417 _Jv_AllocObject (jclass klass, jint size)
 418 {
 419   jobject obj = _Jv_AllocObjectNoFinalizer (klass, size);
 420
 421   // We assume that the compiler only generates calls to this routine
 422   // if there really is an interesting finalizer.
 423   // Unfortunately, we still have to the dynamic test, since there may
 424   // be cni calls to this routine.
 425   // Note that on IA64 get_finalizer() returns the starting address of the
 426   // function, not a function pointer.  Thus this still works.
 427   if (klass->vtable->get_finalizer ()
 428       != java::lang::Object::class$.vtable->get_finalizer ())
 429     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 430   return obj;
 431 }
 432
 433 // A version of the above that assumes the object contains no pointers,
 434 // and requires no finalization.  This can't happen if we need pointers
 435 // to locks.
 436 #ifdef JV_HASH_SYNCHRONIZATION
 437 jobject
 438 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 439 {
 440   _Jv_InitClass (klass);
 441
 442   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 443
 444 #ifdef ENABLE_JVMPI
 445   // Service JVMPI request.
 446
 447   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 448     {
 449       JVMPI_Event event;
 450
 451       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 452       event.env_id = NULL;
 453       event.u.obj_alloc.arena_id = 0;
 454       event.u.obj_alloc.class_id = (jobjectID) klass;
 455       event.u.obj_alloc.is_array = 0;
 456       event.u.obj_alloc.size = size;
 457       event.u.obj_alloc.obj_id = (jobjectID) obj;
 458
 459       _Jv_DisableGC ();
 460       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 461       _Jv_EnableGC ();
 462     }
 463 #endif
 464
 465   return obj;
 466 }
 467 #endif /* JV_HASH_SYNCHRONIZATION */
 468
 469
 470 // Allocate a new array of Java objects.  Each object is of type
 471 // `elementClass'.  `init' is used to initialize each slot in the
 472 // array.
 473 jobjectArray
 474 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 475 {
 476   if (__builtin_expect (count < 0, false))
 477     throw new java::lang::NegativeArraySizeException;
 478
 479   JvAssert (! elementClass->isPrimitive ());
 480
 481   // Ensure that elements pointer is properly aligned.
 482   jobjectArray obj = NULL;
 483   size_t size = (size_t) elements (obj);
 484   size += count * sizeof (jobject);
 485
 486   jclass klass = _Jv_GetArrayClass (elementClass,
 487                                     elementClass->getClassLoaderInternal());
 488
 489   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 490   // Cast away const.
 491   jsize *lp = const_cast<jsize *> (&obj->length);
 492   *lp = count;
 493   // We know the allocator returns zeroed memory.  So don't bother
 494   // zeroing it again.
 495   if (init)
 496     {
 497       jobject *ptr = elements(obj);
 498       while (--count >= 0)
 499         *ptr++ = init;
 500     }
 501   return obj;
 502 }
 503
 504 // Allocate a new array of primitives.  ELTYPE is the type of the
 505 // element, COUNT is the size of the array.
 506 jobject
 507 _Jv_NewPrimArray (jclass eltype, jint count)
 508 {
 509   int elsize = eltype->size();
 510   if (__builtin_expect (count < 0, false))
 511     throw new java::lang::NegativeArraySizeException;
 512
 513   JvAssert (eltype->isPrimitive ());
 514   jobject dummy = NULL;
 515   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 516
 517   // Check for overflow.
 518   if (__builtin_expect ((size_t) count >
 519                         (SIZE_T_MAX - size) / elsize, false))
 520     throw no_memory;
 521
 522   jclass klass = _Jv_GetArrayClass (eltype, 0);
 523
 524 # ifdef JV_HASH_SYNCHRONIZATION
 525   // Since the vtable is always statically allocated,
 526   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 527   __JArray *arr =
 528     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 529   memset((char *)arr + size, 0, elsize * count);
 530 # else
 531   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 532   // Note that we assume we are given zeroed memory by the allocator.
 533 # endif
 534   // Cast away const.
 535   jsize *lp = const_cast<jsize *> (&arr->length);
 536   *lp = count;
 537
 538   return arr;
 539 }
 540
 541 jobject
 542 _Jv_NewArray (jint type, jint size)
 543 {
 544   switch (type)
 545     {
 546       case  4:  return JvNewBooleanArray (size);
 547       case  5:  return JvNewCharArray (size);
 548       case  6:  return JvNewFloatArray (size);
 549       case  7:  return JvNewDoubleArray (size);
 550       case  8:  return JvNewByteArray (size);
 551       case  9:  return JvNewShortArray (size);
 552       case 10:  return JvNewIntArray (size);
 553       case 11:  return JvNewLongArray (size);
 554     }
 555   throw new java::lang::InternalError
 556     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 557 }
 558
 559 // Allocate a possibly multi-dimensional array but don't check that
 560 // any array length is <0.
 561 static jobject
 562 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 563 {
 564   JvAssert (type->isArray());
 565   jclass element_type = type->getComponentType();
 566   jobject result;
 567   if (element_type->isPrimitive())
 568     result = _Jv_NewPrimArray (element_type, sizes[0]);
 569   else
 570     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 571
 572   if (dimensions > 1)
 573     {
 574       JvAssert (! element_type->isPrimitive());
 575       JvAssert (element_type->isArray());
 576       jobject *contents = elements ((jobjectArray) result);
 577       for (int i = 0; i < sizes[0]; ++i)
 578         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 579                                                   sizes + 1);
 580     }
 581
 582   return result;
 583 }
 584
 585 jobject
 586 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 587 {
 588   for (int i = 0; i < dimensions; ++i)
 589     if (sizes[i] < 0)
 590       throw new java::lang::NegativeArraySizeException;
 591
 592   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 593 }
 594
 595 jobject
 596 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 597 {
 598   va_list args;
 599   jint sizes[dimensions];
 600   va_start (args, dimensions);
 601   for (int i = 0; i < dimensions; ++i)
 602     {
 603       jint size = va_arg (args, jint);
 604       if (size < 0)
 605         throw new java::lang::NegativeArraySizeException;
 606       sizes[i] = size;
 607     }
 608   va_end (args);
 609
 610   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 611 }
 612
 613 \f
 614
 615 // Ensure 8-byte alignment, for hash synchronization.
 616 #define DECLARE_PRIM_TYPE(NAME)                 \
 617   _Jv_ArrayVTable _Jv_##NAME##VTable;           \
 618   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 619
 620 DECLARE_PRIM_TYPE(byte)
 621 DECLARE_PRIM_TYPE(short)
 622 DECLARE_PRIM_TYPE(int)
 623 DECLARE_PRIM_TYPE(long)
 624 DECLARE_PRIM_TYPE(boolean)
 625 DECLARE_PRIM_TYPE(char)
 626 DECLARE_PRIM_TYPE(float)
 627 DECLARE_PRIM_TYPE(double)
 628 DECLARE_PRIM_TYPE(void)
 629
 630 void
 631 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len,
 632                    _Jv_ArrayVTable *array_vtable)
 633 {
 634   using namespace java::lang::reflect;
 635
 636   _Jv_InitNewClassFields (cl);
 637
 638   // We must set the vtable for the class; the Java constructor
 639   // doesn't do this.
 640   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 641
 642   // Initialize the fields we care about.  We do this in the same
 643   // order they are declared in Class.h.
 644   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 645   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 646   cl->method_count = sig;
 647   cl->size_in_bytes = len;
 648   cl->vtable = JV_PRIMITIVE_VTABLE;
 649   cl->state = JV_STATE_DONE;
 650   cl->depth = -1;
 651   if (sig != 'V')
 652     _Jv_NewArrayClass (cl, NULL, (_Jv_VTable *) array_vtable);
 653 }
 654
 655 jclass
 656 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 657 {
 658   switch (*sig)
 659     {
 660     case 'B':
 661       return JvPrimClass (byte);
 662     case 'S':
 663       return JvPrimClass (short);
 664     case 'I':
 665       return JvPrimClass (int);
 666     case 'J':
 667       return JvPrimClass (long);
 668     case 'Z':
 669       return JvPrimClass (boolean);
 670     case 'C':
 671       return JvPrimClass (char);
 672     case 'F':
 673       return JvPrimClass (float);
 674     case 'D':
 675       return JvPrimClass (double);
 676     case 'V':
 677       return JvPrimClass (void);
 678     case 'L':
 679       {
 680         int i;
 681         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 682           ;
 683         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 684         return _Jv_FindClass (name, loader);
 685       }
 686     case '[':
 687       {
 688         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 689         if (! klass)
 690           return NULL;
 691         return _Jv_GetArrayClass (klass, loader);
 692       }
 693     }
 694
 695   return NULL;                  // Placate compiler.
 696 }
 697
 698 \f
 699
 700 JArray<jstring> *
 701 JvConvertArgv (int argc, const char **argv)
 702 {
 703   if (argc < 0)
 704     argc = 0;
 705   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 706   jobject *ptr = elements(ar);
 707   jbyteArray bytes = NULL;
 708   for (int i = 0;  i < argc;  i++)
 709     {
 710       const char *arg = argv[i];
 711       int len = strlen (arg);
 712       if (bytes == NULL || bytes->length < len)
 713         bytes = JvNewByteArray (len);
 714       jbyte *bytePtr = elements (bytes);
 715       // We assume jbyte == char.
 716       memcpy (bytePtr, arg, len);
 717
 718       // Now convert using the default encoding.
 719       *ptr++ = new java::lang::String (bytes, 0, len);
 720     }
 721   return (JArray<jstring>*) ar;
 722 }
 723
 724 // FIXME: These variables are static so that they will be
 725 // automatically scanned by the Boehm collector.  This is needed
 726 // because with qthreads the collector won't scan the initial stack --
 727 // it will only scan the qthreads stacks.
 728
 729 // Command line arguments.
 730 static JArray<jstring> *arg_vec;
 731
 732 // The primary thread.
 733 static java::lang::Thread *main_thread;
 734
 735 #ifndef DISABLE_GETENV_PROPERTIES
 736
 737 static char *
 738 next_property_key (char *s, size_t *length)
 739 {
 740   size_t l = 0;
 741
 742   JvAssert (s);
 743
 744   // Skip over whitespace
 745   while (isspace (*s))
 746     s++;
 747
 748   // If we've reached the end, return NULL.  Also return NULL if for
 749   // some reason we've come across a malformed property string.
 750   if (*s == 0
 751       || *s == ':'
 752       || *s == '=')
 753     return NULL;
 754
 755   // Determine the length of the property key.
 756   while (s[l] != 0
 757          && ! isspace (s[l])
 758          && s[l] != ':'
 759          && s[l] != '=')
 760     {
 761       if (s[l] == '\\'
 762           && s[l+1] != 0)
 763         l++;
 764       l++;
 765     }
 766
 767   *length = l;
 768
 769   return s;
 770 }
 771
 772 static char *
 773 next_property_value (char *s, size_t *length)
 774 {
 775   size_t l = 0;
 776
 777   JvAssert (s);
 778
 779   while (isspace (*s))
 780     s++;
 781
 782   if (*s == ':'
 783       || *s == '=')
 784     s++;
 785
 786   while (isspace (*s))
 787     s++;
 788
 789   // If we've reached the end, return NULL.
 790   if (*s == 0)
 791     return NULL;
 792
 793   // Determine the length of the property value.
 794   while (s[l] != 0
 795          && ! isspace (s[l])
 796          && s[l] != ':'
 797          && s[l] != '=')
 798     {
 799       if (s[l] == '\\'
 800           && s[l+1] != 0)
 801         l += 2;
 802       else
 803         l++;
 804     }
 805
 806   *length = l;
 807
 808   return s;
 809 }
 810
 811 static void
 812 process_gcj_properties ()
 813 {
 814   char *props = getenv("GCJ_PROPERTIES");
 815   char *p = props;
 816   size_t length;
 817   size_t property_count = 0;
 818
 819   if (NULL == props)
 820     return;
 821
 822   // Whip through props quickly in order to count the number of
 823   // property values.
 824   while (p && (p = next_property_key (p, &length)))
 825     {
 826       // Skip to the end of the key
 827       p += length;
 828
 829       p = next_property_value (p, &length);
 830       if (p)
 831         p += length;
 832
 833       property_count++;
 834     }
 835
 836   // Allocate an array of property value/key pairs.
 837   _Jv_Environment_Properties =
 838     (property_pair *) malloc (sizeof(property_pair)
 839                               * (property_count + 1));
 840
 841   // Go through the properties again, initializing _Jv_Properties
 842   // along the way.
 843   p = props;
 844   property_count = 0;
 845   while (p && (p = next_property_key (p, &length)))
 846     {
 847       _Jv_Environment_Properties[property_count].key = p;
 848       _Jv_Environment_Properties[property_count].key_length = length;
 849
 850       // Skip to the end of the key
 851       p += length;
 852
 853       p = next_property_value (p, &length);
 854
 855       _Jv_Environment_Properties[property_count].value = p;
 856       _Jv_Environment_Properties[property_count].value_length = length;
 857
 858       if (p)
 859         p += length;
 860
 861       property_count++;
 862     }
 863   memset ((void *) &_Jv_Environment_Properties[property_count],
 864           0, sizeof (property_pair));
 865   {
 866     size_t i = 0;
 867
 868     // Null terminate the strings.
 869     while (_Jv_Environment_Properties[i].key)
 870       {
 871         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 872         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 873       }
 874   }
 875 }
 876 #endif // DISABLE_GETENV_PROPERTIES
 877
 878 namespace gcj
 879 {
 880   _Jv_Utf8Const *void_signature;
 881   _Jv_Utf8Const *clinit_name;
 882   _Jv_Utf8Const *init_name;
 883   _Jv_Utf8Const *finit_name;
 884
 885   bool runtimeInitialized = false;
 886 }
 887
 888 jint
 889 _Jv_CreateJavaVM (void* /*vm_args*/)
 890 {
 891   using namespace gcj;
 892
 893   if (runtimeInitialized)
 894     return -1;
 895
 896   runtimeInitialized = true;
 897
 898   PROCESS_GCJ_PROPERTIES;
 899
 900   _Jv_InitThreads ();
 901   _Jv_InitGC ();
 902   _Jv_InitializeSyncMutex ();
 903
 904   /* Initialize Utf8 constants declared in jvm.h. */
 905   void_signature = _Jv_makeUtf8Const ("()V", 3);
 906   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 907   init_name = _Jv_makeUtf8Const ("<init>", 6);
 908   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 909
 910   /* Initialize built-in classes to represent primitive TYPEs. */
 911   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1, &_Jv_byteVTable);
 912   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2, &_Jv_shortVTable);
 913   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4, &_Jv_intVTable);
 914   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8, &_Jv_longVTable);
 915   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1, &_Jv_booleanVTable);
 916   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2, &_Jv_charVTable);
 917   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4, &_Jv_floatVTable);
 918   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8, &_Jv_doubleVTable);
 919   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0, &_Jv_voidVTable);
 920
 921   // Turn stack trace generation off while creating exception objects.
 922   _Jv_InitClass (&java::lang::VMThrowable::class$);
 923   java::lang::VMThrowable::trace_enabled = 0;
 924
 925   INIT_SEGV;
 926 #ifdef HANDLE_FPE
 927   INIT_FPE;
 928 #endif
 929
 930   no_memory = new java::lang::OutOfMemoryError;
 931
 932   java::lang::VMThrowable::trace_enabled = 1;
 933
 934 #ifdef USE_LTDL
 935   LTDL_SET_PRELOADED_SYMBOLS ();
 936 #endif
 937
 938   _Jv_platform_initialize ();
 939
 940   _Jv_JNI_Init ();
 941
 942   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
 943
 944   // Start the GC finalizer thread.  A VirtualMachineError can be
 945   // thrown by the runtime if, say, threads aren't available.  In this
 946   // case finalizers simply won't run.
 947   try
 948     {
 949       using namespace gnu::gcj::runtime;
 950       FinalizerThread *ft = new FinalizerThread ();
 951       ft->start ();
 952     }
 953   catch (java::lang::VirtualMachineError *ignore)
 954     {
 955     }
 956
 957   return 0;
 958 }
 959
 960 void
 961 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 962              bool is_jar)
 963 {
 964   _Jv_SetArgs (argc, argv);
 965
 966   java::lang::Runtime *runtime = NULL;
 967
 968   try
 969     {
 970       // Set this very early so that it is seen when java.lang.System
 971       // is initialized.
 972       if (is_jar)
 973         _Jv_Jar_Class_Path = strdup (name);
 974       _Jv_CreateJavaVM (NULL);
 975
 976       // Get the Runtime here.  We want to initialize it before searching
 977       // for `main'; that way it will be set up if `main' is a JNI method.
 978       runtime = java::lang::Runtime::getRuntime ();
 979
 980 #ifdef DISABLE_MAIN_ARGS
 981       arg_vec = JvConvertArgv (0, 0);
 982 #else
 983       arg_vec = JvConvertArgv (argc - 1, argv + 1);
 984 #endif
 985
 986       // We have to initialize this fairly early, to avoid circular
 987       // class initialization.  In particular we want to start the
 988       // initialization of ClassLoader before we start the
 989       // initialization of VMClassLoader.
 990       _Jv_InitClass (&java::lang::ClassLoader::class$);
 991
 992       using namespace gnu::gcj::runtime;
 993       if (klass)
 994         main_thread = new FirstThread (klass, arg_vec);
 995       else
 996         main_thread = new FirstThread (JvNewStringLatin1 (name),
 997                                        arg_vec, is_jar);
 998     }
 999   catch (java::lang::Throwable *t)
1000     {
1001       java::lang::System::err->println (JvNewStringLatin1
1002         ("Exception during runtime initialization"));
1003       t->printStackTrace();
1004       runtime->exit (1);
1005     }
1006
1007   _Jv_AttachCurrentThread (main_thread);
1008   _Jv_ThreadRun (main_thread);
1009   _Jv_ThreadWait ();
1010
1011   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1012   runtime->exit (status);
1013 }
1014
1015 void
1016 JvRunMain (jclass klass, int argc, const char **argv)
1017 {
1018   _Jv_RunMain (klass, NULL, argc, argv, false);
1019 }
1020
1021 \f
1022
1023 // Parse a string and return a heap size.
1024 static size_t
1025 parse_heap_size (const char *spec)
1026 {
1027   char *end;
1028   unsigned long val = strtoul (spec, &end, 10);
1029   if (*end == 'k' || *end == 'K')
1030     val *= 1024;
1031   else if (*end == 'm' || *end == 'M')
1032     val *= 1048576;
1033   return (size_t) val;
1034 }
1035
1036 // Set the initial heap size.  This might be ignored by the GC layer.
1037 // This must be called before _Jv_RunMain.
1038 void
1039 _Jv_SetInitialHeapSize (const char *arg)
1040 {
1041   size_t size = parse_heap_size (arg);
1042   _Jv_GCSetInitialHeapSize (size);
1043 }
1044
1045 // Set the maximum heap size.  This might be ignored by the GC layer.
1046 // This must be called before _Jv_RunMain.
1047 void
1048 _Jv_SetMaximumHeapSize (const char *arg)
1049 {
1050   size_t size = parse_heap_size (arg);
1051   _Jv_GCSetMaximumHeapSize (size);
1052 }
1053
1054 \f
1055
1056 void *
1057 _Jv_Malloc (jsize size)
1058 {
1059   if (__builtin_expect (size == 0, false))
1060     size = 1;
1061   void *ptr = malloc ((size_t) size);
1062   if (__builtin_expect (ptr == NULL, false))
1063     throw no_memory;
1064   return ptr;
1065 }
1066
1067 void *
1068 _Jv_Realloc (void *ptr, jsize size)
1069 {
1070   if (__builtin_expect (size == 0, false))
1071     size = 1;
1072   ptr = realloc (ptr, (size_t) size);
1073   if (__builtin_expect (ptr == NULL, false))
1074     throw no_memory;
1075   return ptr;
1076 }
1077
1078 void *
1079 _Jv_MallocUnchecked (jsize size)
1080 {
1081   if (__builtin_expect (size == 0, false))
1082     size = 1;
1083   return malloc ((size_t) size);
1084 }
1085
1086 void
1087 _Jv_Free (void* ptr)
1088 {
1089   return free (ptr);
1090 }
1091
1092 \f
1093
1094 // In theory, these routines can be #ifdef'd away on machines which
1095 // support divide overflow signals.  However, we never know if some
1096 // code might have been compiled with "-fuse-divide-subroutine", so we
1097 // always include them in libgcj.
1098
1099 jint
1100 _Jv_divI (jint dividend, jint divisor)
1101 {
1102   if (__builtin_expect (divisor == 0, false))
1103     {
1104       java::lang::ArithmeticException *arithexception
1105         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1106       throw arithexception;
1107     }
1108
1109   if (dividend == (jint) 0x80000000L && divisor == -1)
1110     return dividend;
1111
1112   return dividend / divisor;
1113 }
1114
1115 jint
1116 _Jv_remI (jint dividend, jint divisor)
1117 {
1118   if (__builtin_expect (divisor == 0, false))
1119     {
1120       java::lang::ArithmeticException *arithexception
1121         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1122       throw arithexception;
1123     }
1124
1125   if (dividend == (jint) 0x80000000L && divisor == -1)
1126     return 0;
1127
1128   return dividend % divisor;
1129 }
1130
1131 jlong
1132 _Jv_divJ (jlong dividend, jlong divisor)
1133 {
1134   if (__builtin_expect (divisor == 0, false))
1135     {
1136       java::lang::ArithmeticException *arithexception
1137         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1138       throw arithexception;
1139     }
1140
1141   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1142     return dividend;
1143
1144   return dividend / divisor;
1145 }
1146
1147 jlong
1148 _Jv_remJ (jlong dividend, jlong divisor)
1149 {
1150   if (__builtin_expect (divisor == 0, false))
1151     {
1152       java::lang::ArithmeticException *arithexception
1153         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1154       throw arithexception;
1155     }
1156
1157   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1158     return 0;
1159
1160   return dividend % divisor;
1161 }
1162
1163 \f
1164
1165 // Return true if SELF_KLASS can access a field or method in
1166 // OTHER_KLASS.  The field or method's access flags are specified in
1167 // FLAGS.
1168 jboolean
1169 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1170 {
1171   using namespace java::lang::reflect;
1172   return ((self_klass == other_klass)
1173           || ((flags & Modifier::PUBLIC) != 0)
1174           || (((flags & Modifier::PROTECTED) != 0)
1175               && other_klass->isAssignableFrom (self_klass))
1176           || (((flags & Modifier::PRIVATE) == 0)
1177               && _Jv_ClassNameSamePackage (self_klass->name,
1178                                            other_klass->name)));
1179 }