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