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
  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 // Number of bytes in largest array object we create.  This could be
  74 // increased to the largest size_t value, so long as the appropriate
  75 // functions are changed to take a size_t argument instead of jint.
  76 #define MAX_OBJECT_SIZE ((1<<31) - 1)
  77
  78 static const char *no_properties[] = { NULL };
  79
  80 // Properties set at compile time.
  81 const char **_Jv_Compiler_Properties = no_properties;
  82
  83 // The JAR file to add to the beginning of java.class.path.
  84 const char *_Jv_Jar_Class_Path;
  85
  86 #ifndef DISABLE_GETENV_PROPERTIES
  87 // Property key/value pairs.
  88 property_pair *_Jv_Environment_Properties;
  89 #endif
  90
  91 // Stash the argv pointer to benefit native libraries that need it.
  92 const char **_Jv_argv;
  93 int _Jv_argc;
  94
  95 // Argument support.
  96 int
  97 _Jv_GetNbArgs (void)
  98 {
  99   // _Jv_argc is 0 if not explicitly initialized.
 100   return _Jv_argc;
 101 }
 102
 103 const char *
 104 _Jv_GetSafeArg (int index)
 105 {
 106   if (index >=0 && index < _Jv_GetNbArgs ())
 107     return _Jv_argv[index];
 108   else
 109     return "";
 110 }
 111
 112 void
 113 _Jv_SetArgs (int argc, const char **argv)
 114 {
 115   _Jv_argc = argc;
 116   _Jv_argv = argv;
 117 }
 118
 119 #ifdef ENABLE_JVMPI
 120 // Pointer to JVMPI notification functions.
 121 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 122 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 123 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 124 #endif
 125 \f
 126
 127 /* Unblock a signal.  Unless we do this, the signal may only be sent
 128    once.  */
 129 static void
 130 unblock_signal (int signum)
 131 {
 132 #ifdef _POSIX_VERSION
 133   sigset_t sigs;
 134
 135   sigemptyset (&sigs);
 136   sigaddset (&sigs, signum);
 137   sigprocmask (SIG_UNBLOCK, &sigs, NULL);
 138 #endif
 139 }
 140
 141 #ifdef HANDLE_SEGV
 142 SIGNAL_HANDLER (catch_segv)
 143 {
 144   java::lang::NullPointerException *nullp
 145     = new java::lang::NullPointerException;
 146   unblock_signal (SIGSEGV);
 147   MAKE_THROW_FRAME (nullp);
 148   throw nullp;
 149 }
 150 #endif
 151
 152 #ifdef HANDLE_FPE
 153 SIGNAL_HANDLER (catch_fpe)
 154 {
 155   java::lang::ArithmeticException *arithexception
 156     = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
 157   unblock_signal (SIGFPE);
 158 #ifdef HANDLE_DIVIDE_OVERFLOW
 159   HANDLE_DIVIDE_OVERFLOW;
 160 #else
 161   MAKE_THROW_FRAME (arithexception);
 162 #endif
 163   throw arithexception;
 164 }
 165 #endif
 166
 167 \f
 168
 169 jboolean
 170 _Jv_equalUtf8Consts (const Utf8Const* a, const Utf8Const *b)
 171 {
 172   int len;
 173   const _Jv_ushort *aptr, *bptr;
 174   if (a == b)
 175     return true;
 176   if (a->hash != b->hash)
 177     return false;
 178   len = a->length;
 179   if (b->length != len)
 180     return false;
 181   aptr = (const _Jv_ushort *)a->data;
 182   bptr = (const _Jv_ushort *)b->data;
 183   len = (len + 1) >> 1;
 184   while (--len >= 0)
 185     if (*aptr++ != *bptr++)
 186       return false;
 187   return true;
 188 }
 189
 190 /* True iff A is equal to STR.
 191    HASH is STR->hashCode().
 192 */
 193
 194 jboolean
 195 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 196 {
 197   if (a->hash != (_Jv_ushort) hash)
 198     return false;
 199   jint len = str->length();
 200   jint i = 0;
 201   jchar *sptr = _Jv_GetStringChars (str);
 202   unsigned char* ptr = (unsigned char*) a->data;
 203   unsigned char* limit = ptr + a->length;
 204   for (;; i++, sptr++)
 205     {
 206       int ch = UTF8_GET (ptr, limit);
 207       if (i == len)
 208         return ch < 0;
 209       if (ch != *sptr)
 210         return false;
 211     }
 212   return true;
 213 }
 214
 215 /* Like _Jv_equal, but stop after N characters.  */
 216 jboolean
 217 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 218 {
 219   jint len = str->length();
 220   jint i = 0;
 221   jchar *sptr = _Jv_GetStringChars (str);
 222   unsigned char* ptr = (unsigned char*) a->data;
 223   unsigned char* limit = ptr + a->length;
 224   for (; n-- > 0; i++, sptr++)
 225     {
 226       int ch = UTF8_GET (ptr, limit);
 227       if (i == len)
 228         return ch < 0;
 229       if (ch != *sptr)
 230         return false;
 231     }
 232   return true;
 233 }
 234
 235 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 236 int
 237 _Jv_strLengthUtf8(char* str, int len)
 238 {
 239   unsigned char* ptr;
 240   unsigned char* limit;
 241   int str_length;
 242
 243   ptr = (unsigned char*) str;
 244   limit = ptr + len;
 245   str_length = 0;
 246   for (; ptr < limit; str_length++)
 247     {
 248       if (UTF8_GET (ptr, limit) < 0)
 249         return (-1);
 250     }
 251   return (str_length);
 252 }
 253
 254 /* Calculate a hash value for a string encoded in Utf8 format.
 255  * This returns the same hash value as specified or java.lang.String.hashCode.
 256  */
 257 static jint
 258 hashUtf8String (char* str, int len)
 259 {
 260   unsigned char* ptr = (unsigned char*) str;
 261   unsigned char* limit = ptr + len;
 262   jint hash = 0;
 263
 264   for (; ptr < limit;)
 265     {
 266       int ch = UTF8_GET (ptr, limit);
 267       /* Updated specification from
 268          http://www.javasoft.com/docs/books/jls/clarify.html. */
 269       hash = (31 * hash) + ch;
 270     }
 271   return hash;
 272 }
 273
 274 _Jv_Utf8Const *
 275 _Jv_makeUtf8Const (char* s, int len)
 276 {
 277   if (len < 0)
 278     len = strlen (s);
 279   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 280   memcpy (m->data, s, len);
 281   m->data[len] = 0;
 282   m->length = len;
 283   m->hash = hashUtf8String (s, len) & 0xFFFF;
 284   return (m);
 285 }
 286
 287 _Jv_Utf8Const *
 288 _Jv_makeUtf8Const (jstring string)
 289 {
 290   jint hash = string->hashCode ();
 291   jint len = _Jv_GetStringUTFLength (string);
 292
 293   Utf8Const* m = (Utf8Const*)
 294     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 295
 296   m->hash = hash;
 297   m->length = len;
 298
 299   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 300   m->data[len] = 0;
 301
 302   return m;
 303 }
 304
 305 \f
 306
 307 #ifdef DEBUG
 308 void
 309 _Jv_Abort (const char *function, const char *file, int line,
 310            const char *message)
 311 #else
 312 void
 313 _Jv_Abort (const char *, const char *, int, const char *message)
 314 #endif
 315 {
 316 #ifdef DEBUG
 317   fprintf (stderr,
 318            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 319            message, function, file, line);
 320 #else
 321   fprintf (stderr, "libgcj failure: %s\n", message);
 322 #endif
 323   abort ();
 324 }
 325
 326 static void
 327 fail_on_finalization (jobject)
 328 {
 329   JvFail ("object was finalized");
 330 }
 331
 332 void
 333 _Jv_GCWatch (jobject obj)
 334 {
 335   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 336 }
 337
 338 void
 339 _Jv_ThrowBadArrayIndex(jint bad_index)
 340 {
 341   throw new java::lang::ArrayIndexOutOfBoundsException
 342     (java::lang::String::valueOf (bad_index));
 343 }
 344
 345 void
 346 _Jv_ThrowNullPointerException ()
 347 {
 348   throw new java::lang::NullPointerException;
 349 }
 350
 351 // Explicitly throw a no memory exception.
 352 // The collector calls this when it encounters an out-of-memory condition.
 353 void _Jv_ThrowNoMemory()
 354 {
 355   throw no_memory;
 356 }
 357
 358 #ifdef ENABLE_JVMPI
 359 static void
 360 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 361 {
 362   // Service JVMPI allocation request.
 363   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 364     {
 365       JVMPI_Event event;
 366
 367       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 368       event.env_id = NULL;
 369       event.u.obj_alloc.arena_id = 0;
 370       event.u.obj_alloc.class_id = (jobjectID) klass;
 371       event.u.obj_alloc.is_array = 0;
 372       event.u.obj_alloc.size = size;
 373       event.u.obj_alloc.obj_id = (jobjectID) obj;
 374
 375       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 376       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 377       // More importantly, I don't see the need for disabling GC, since we
 378       // blatantly have a pointer to obj on our stack, ensuring that the
 379       // object can't be collected.  Even for a nonconservative collector,
 380       // it appears to me that this must be true, since we are about to
 381       // return obj. Isn't this whole approach way too intrusive for
 382       // a useful profiling interface?                  - HB
 383       _Jv_DisableGC ();
 384       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 385       _Jv_EnableGC ();
 386     }
 387 }
 388 #else /* !ENABLE_JVMPI */
 389 # define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 390 #endif
 391
 392 // Allocate a new object of class KLASS.
 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)
 399 {
 400   jint size = klass->size ();
 401   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 402   jvmpi_notify_alloc (klass, size, obj);
 403   return obj;
 404 }
 405
 406 // And now a version that initializes if necessary.
 407 jobject
 408 _Jv_AllocObjectNoFinalizer (jclass klass)
 409 {
 410   _Jv_InitClass (klass);
 411   jint size = klass->size ();
 412   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 413   jvmpi_notify_alloc (klass, size, obj);
 414   return obj;
 415 }
 416
 417 // And now the general version that registers a finalizer if necessary.
 418 jobject
 419 _Jv_AllocObject (jclass klass)
 420 {
 421   jobject obj = _Jv_AllocObjectNoFinalizer (klass);
 422
 423   // We assume that the compiler only generates calls to this routine
 424   // if there really is an interesting finalizer.
 425   // Unfortunately, we still have to the dynamic test, since there may
 426   // be cni calls to this routine.
 427   // Note that on IA64 get_finalizer() returns the starting address of the
 428   // function, not a function pointer.  Thus this still works.
 429   if (klass->vtable->get_finalizer ()
 430       != java::lang::Object::class$.vtable->get_finalizer ())
 431     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 432   return obj;
 433 }
 434
 435 // Allocate a String, including variable length storage.
 436 jstring
 437 _Jv_AllocString(jsize len)
 438 {
 439   using namespace java::lang;
 440
 441   jsize sz = sizeof(java::lang::String) + len * sizeof(jchar);
 442
 443   // We assert that for strings allocated this way, the data field
 444   // will always point to the object itself.  Thus there is no reason
 445   // for the garbage collector to scan any of it.
 446   // Furthermore, we're about to overwrite the string data, so
 447   // initialization of the object is not an issue.
 448
 449   // String needs no initialization, and there is no finalizer, so
 450   // we can go directly to the collector's allocator interface.
 451   jstring obj = (jstring) _Jv_AllocPtrFreeObj(sz, &String::class$);
 452
 453   obj->data = obj;
 454   obj->boffset = sizeof(java::lang::String);
 455   obj->count = len;
 456   obj->cachedHashCode = 0;
 457
 458 #ifdef ENABLE_JVMPI
 459   // Service JVMPI request.
 460
 461   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 462     {
 463       JVMPI_Event event;
 464
 465       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 466       event.env_id = NULL;
 467       event.u.obj_alloc.arena_id = 0;
 468       event.u.obj_alloc.class_id = (jobjectID) &String::class$;
 469       event.u.obj_alloc.is_array = 0;
 470       event.u.obj_alloc.size = sz;
 471       event.u.obj_alloc.obj_id = (jobjectID) obj;
 472
 473       _Jv_DisableGC ();
 474       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 475       _Jv_EnableGC ();
 476     }
 477 #endif
 478
 479   return obj;
 480 }
 481
 482 // A version of the above that assumes the object contains no pointers,
 483 // and requires no finalization.  This can't happen if we need pointers
 484 // to locks.
 485 #ifdef JV_HASH_SYNCHRONIZATION
 486 jobject
 487 _Jv_AllocPtrFreeObject (jclass klass)
 488 {
 489   _Jv_InitClass (klass);
 490   jint size = klass->size ();
 491
 492   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 493
 494 #ifdef ENABLE_JVMPI
 495   // Service JVMPI request.
 496
 497   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 498     {
 499       JVMPI_Event event;
 500
 501       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 502       event.env_id = NULL;
 503       event.u.obj_alloc.arena_id = 0;
 504       event.u.obj_alloc.class_id = (jobjectID) klass;
 505       event.u.obj_alloc.is_array = 0;
 506       event.u.obj_alloc.size = size;
 507       event.u.obj_alloc.obj_id = (jobjectID) obj;
 508
 509       _Jv_DisableGC ();
 510       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 511       _Jv_EnableGC ();
 512     }
 513 #endif
 514
 515   return obj;
 516 }
 517 #endif /* JV_HASH_SYNCHRONIZATION */
 518
 519
 520 // Allocate a new array of Java objects.  Each object is of type
 521 // `elementClass'.  `init' is used to initialize each slot in the
 522 // array.
 523 jobjectArray
 524 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 525 {
 526   if (__builtin_expect (count < 0, false))
 527     throw new java::lang::NegativeArraySizeException;
 528
 529   JvAssert (! elementClass->isPrimitive ());
 530
 531   // Ensure that elements pointer is properly aligned.
 532   jobjectArray obj = NULL;
 533   size_t size = (size_t) elements (obj);
 534   // Check for overflow.
 535   if (__builtin_expect ((size_t) count >
 536                         (MAX_OBJECT_SIZE - 1 - size) / sizeof (jobject), false))
 537     throw no_memory;
 538
 539   size += count * sizeof (jobject);
 540
 541   jclass klass = _Jv_GetArrayClass (elementClass,
 542                                     elementClass->getClassLoaderInternal());
 543
 544   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 545   // Cast away const.
 546   jsize *lp = const_cast<jsize *> (&obj->length);
 547   *lp = count;
 548   // We know the allocator returns zeroed memory.  So don't bother
 549   // zeroing it again.
 550   if (init)
 551     {
 552       jobject *ptr = elements(obj);
 553       while (--count >= 0)
 554         *ptr++ = init;
 555     }
 556   return obj;
 557 }
 558
 559 // Allocate a new array of primitives.  ELTYPE is the type of the
 560 // element, COUNT is the size of the array.
 561 jobject
 562 _Jv_NewPrimArray (jclass eltype, jint count)
 563 {
 564   int elsize = eltype->size();
 565   if (__builtin_expect (count < 0, false))
 566     throw new java::lang::NegativeArraySizeException;
 567
 568   JvAssert (eltype->isPrimitive ());
 569   jobject dummy = NULL;
 570   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 571
 572   // Check for overflow.
 573   if (__builtin_expect ((size_t) count >
 574                         (MAX_OBJECT_SIZE - size) / elsize, false))
 575     throw no_memory;
 576
 577   jclass klass = _Jv_GetArrayClass (eltype, 0);
 578
 579 # ifdef JV_HASH_SYNCHRONIZATION
 580   // Since the vtable is always statically allocated,
 581   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 582   __JArray *arr =
 583     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 584   memset((char *)arr + size, 0, elsize * count);
 585 # else
 586   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 587   // Note that we assume we are given zeroed memory by the allocator.
 588 # endif
 589   // Cast away const.
 590   jsize *lp = const_cast<jsize *> (&arr->length);
 591   *lp = count;
 592
 593   return arr;
 594 }
 595
 596 jobject
 597 _Jv_NewArray (jint type, jint size)
 598 {
 599   switch (type)
 600     {
 601       case  4:  return JvNewBooleanArray (size);
 602       case  5:  return JvNewCharArray (size);
 603       case  6:  return JvNewFloatArray (size);
 604       case  7:  return JvNewDoubleArray (size);
 605       case  8:  return JvNewByteArray (size);
 606       case  9:  return JvNewShortArray (size);
 607       case 10:  return JvNewIntArray (size);
 608       case 11:  return JvNewLongArray (size);
 609     }
 610   throw new java::lang::InternalError
 611     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 612 }
 613
 614 // Allocate a possibly multi-dimensional array but don't check that
 615 // any array length is <0.
 616 static jobject
 617 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 618 {
 619   JvAssert (type->isArray());
 620   jclass element_type = type->getComponentType();
 621   jobject result;
 622   if (element_type->isPrimitive())
 623     result = _Jv_NewPrimArray (element_type, sizes[0]);
 624   else
 625     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 626
 627   if (dimensions > 1)
 628     {
 629       JvAssert (! element_type->isPrimitive());
 630       JvAssert (element_type->isArray());
 631       jobject *contents = elements ((jobjectArray) result);
 632       for (int i = 0; i < sizes[0]; ++i)
 633         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 634                                                   sizes + 1);
 635     }
 636
 637   return result;
 638 }
 639
 640 jobject
 641 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 642 {
 643   for (int i = 0; i < dimensions; ++i)
 644     if (sizes[i] < 0)
 645       throw new java::lang::NegativeArraySizeException;
 646
 647   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 648 }
 649
 650 jobject
 651 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 652 {
 653   va_list args;
 654   jint sizes[dimensions];
 655   va_start (args, dimensions);
 656   for (int i = 0; i < dimensions; ++i)
 657     {
 658       jint size = va_arg (args, jint);
 659       if (size < 0)
 660         throw new java::lang::NegativeArraySizeException;
 661       sizes[i] = size;
 662     }
 663   va_end (args);
 664
 665   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 666 }
 667
 668 \f
 669
 670 // Ensure 8-byte alignment, for hash synchronization.
 671 #define DECLARE_PRIM_TYPE(NAME)                 \
 672   _Jv_ArrayVTable _Jv_##NAME##VTable;           \
 673   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 674
 675 DECLARE_PRIM_TYPE(byte)
 676 DECLARE_PRIM_TYPE(short)
 677 DECLARE_PRIM_TYPE(int)
 678 DECLARE_PRIM_TYPE(long)
 679 DECLARE_PRIM_TYPE(boolean)
 680 DECLARE_PRIM_TYPE(char)
 681 DECLARE_PRIM_TYPE(float)
 682 DECLARE_PRIM_TYPE(double)
 683 DECLARE_PRIM_TYPE(void)
 684
 685 void
 686 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len,
 687                    _Jv_ArrayVTable *array_vtable)
 688 {
 689   using namespace java::lang::reflect;
 690
 691   // We must set the vtable for the class; the Java constructor
 692   // doesn't do this.
 693   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 694
 695   // Initialize the fields we care about.  We do this in the same
 696   // order they are declared in Class.h.
 697   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 698   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 699   cl->method_count = sig;
 700   cl->size_in_bytes = len;
 701   cl->vtable = JV_PRIMITIVE_VTABLE;
 702   cl->state = JV_STATE_DONE;
 703   cl->depth = -1;
 704   if (sig != 'V')
 705     _Jv_NewArrayClass (cl, NULL, (_Jv_VTable *) array_vtable);
 706 }
 707
 708 jclass
 709 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 710 {
 711   switch (*sig)
 712     {
 713     case 'B':
 714       return JvPrimClass (byte);
 715     case 'S':
 716       return JvPrimClass (short);
 717     case 'I':
 718       return JvPrimClass (int);
 719     case 'J':
 720       return JvPrimClass (long);
 721     case 'Z':
 722       return JvPrimClass (boolean);
 723     case 'C':
 724       return JvPrimClass (char);
 725     case 'F':
 726       return JvPrimClass (float);
 727     case 'D':
 728       return JvPrimClass (double);
 729     case 'V':
 730       return JvPrimClass (void);
 731     case 'L':
 732       {
 733         int i;
 734         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 735           ;
 736         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 737         return _Jv_FindClass (name, loader);
 738       }
 739     case '[':
 740       {
 741         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 742         if (! klass)
 743           return NULL;
 744         return _Jv_GetArrayClass (klass, loader);
 745       }
 746     }
 747
 748   return NULL;                  // Placate compiler.
 749 }
 750
 751 \f
 752
 753 JArray<jstring> *
 754 JvConvertArgv (int argc, const char **argv)
 755 {
 756   if (argc < 0)
 757     argc = 0;
 758   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 759   jobject *ptr = elements(ar);
 760   jbyteArray bytes = NULL;
 761   for (int i = 0;  i < argc;  i++)
 762     {
 763       const char *arg = argv[i];
 764       int len = strlen (arg);
 765       if (bytes == NULL || bytes->length < len)
 766         bytes = JvNewByteArray (len);
 767       jbyte *bytePtr = elements (bytes);
 768       // We assume jbyte == char.
 769       memcpy (bytePtr, arg, len);
 770
 771       // Now convert using the default encoding.
 772       *ptr++ = new java::lang::String (bytes, 0, len);
 773     }
 774   return (JArray<jstring>*) ar;
 775 }
 776
 777 // FIXME: These variables are static so that they will be
 778 // automatically scanned by the Boehm collector.  This is needed
 779 // because with qthreads the collector won't scan the initial stack --
 780 // it will only scan the qthreads stacks.
 781
 782 // Command line arguments.
 783 static JArray<jstring> *arg_vec;
 784
 785 // The primary thread.
 786 static java::lang::Thread *main_thread;
 787
 788 #ifndef DISABLE_GETENV_PROPERTIES
 789
 790 static char *
 791 next_property_key (char *s, size_t *length)
 792 {
 793   size_t l = 0;
 794
 795   JvAssert (s);
 796
 797   // Skip over whitespace
 798   while (isspace (*s))
 799     s++;
 800
 801   // If we've reached the end, return NULL.  Also return NULL if for
 802   // some reason we've come across a malformed property string.
 803   if (*s == 0
 804       || *s == ':'
 805       || *s == '=')
 806     return NULL;
 807
 808   // Determine the length of the property key.
 809   while (s[l] != 0
 810          && ! isspace (s[l])
 811          && s[l] != ':'
 812          && s[l] != '=')
 813     {
 814       if (s[l] == '\\'
 815           && s[l+1] != 0)
 816         l++;
 817       l++;
 818     }
 819
 820   *length = l;
 821
 822   return s;
 823 }
 824
 825 static char *
 826 next_property_value (char *s, size_t *length)
 827 {
 828   size_t l = 0;
 829
 830   JvAssert (s);
 831
 832   while (isspace (*s))
 833     s++;
 834
 835   if (*s == ':'
 836       || *s == '=')
 837     s++;
 838
 839   while (isspace (*s))
 840     s++;
 841
 842   // If we've reached the end, return NULL.
 843   if (*s == 0)
 844     return NULL;
 845
 846   // Determine the length of the property value.
 847   while (s[l] != 0
 848          && ! isspace (s[l])
 849          && s[l] != ':'
 850          && s[l] != '=')
 851     {
 852       if (s[l] == '\\'
 853           && s[l+1] != 0)
 854         l += 2;
 855       else
 856         l++;
 857     }
 858
 859   *length = l;
 860
 861   return s;
 862 }
 863
 864 static void
 865 process_gcj_properties ()
 866 {
 867   char *props = getenv("GCJ_PROPERTIES");
 868   char *p = props;
 869   size_t length;
 870   size_t property_count = 0;
 871
 872   if (NULL == props)
 873     return;
 874
 875   // Whip through props quickly in order to count the number of
 876   // property values.
 877   while (p && (p = next_property_key (p, &length)))
 878     {
 879       // Skip to the end of the key
 880       p += length;
 881
 882       p = next_property_value (p, &length);
 883       if (p)
 884         p += length;
 885
 886       property_count++;
 887     }
 888
 889   // Allocate an array of property value/key pairs.
 890   _Jv_Environment_Properties =
 891     (property_pair *) malloc (sizeof(property_pair)
 892                               * (property_count + 1));
 893
 894   // Go through the properties again, initializing _Jv_Properties
 895   // along the way.
 896   p = props;
 897   property_count = 0;
 898   while (p && (p = next_property_key (p, &length)))
 899     {
 900       _Jv_Environment_Properties[property_count].key = p;
 901       _Jv_Environment_Properties[property_count].key_length = length;
 902
 903       // Skip to the end of the key
 904       p += length;
 905
 906       p = next_property_value (p, &length);
 907
 908       _Jv_Environment_Properties[property_count].value = p;
 909       _Jv_Environment_Properties[property_count].value_length = length;
 910
 911       if (p)
 912         p += length;
 913
 914       property_count++;
 915     }
 916   memset ((void *) &_Jv_Environment_Properties[property_count],
 917           0, sizeof (property_pair));
 918   {
 919     size_t i = 0;
 920
 921     // Null terminate the strings.
 922     while (_Jv_Environment_Properties[i].key)
 923       {
 924         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 925         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 926       }
 927   }
 928 }
 929 #endif // DISABLE_GETENV_PROPERTIES
 930
 931 namespace gcj
 932 {
 933   _Jv_Utf8Const *void_signature;
 934   _Jv_Utf8Const *clinit_name;
 935   _Jv_Utf8Const *init_name;
 936   _Jv_Utf8Const *finit_name;
 937
 938   bool runtimeInitialized = false;
 939 }
 940
 941 jint
 942 _Jv_CreateJavaVM (void* /*vm_args*/)
 943 {
 944   using namespace gcj;
 945
 946   if (runtimeInitialized)
 947     return -1;
 948
 949   runtimeInitialized = true;
 950
 951   PROCESS_GCJ_PROPERTIES;
 952
 953   _Jv_InitThreads ();
 954   _Jv_InitGC ();
 955   _Jv_InitializeSyncMutex ();
 956
 957 #ifdef HANDLE_SEGV
 958   INIT_SEGV;
 959 #endif
 960
 961 #ifdef HANDLE_FPE
 962   INIT_FPE;
 963 #endif
 964
 965   /* Initialize Utf8 constants declared in jvm.h. */
 966   void_signature = _Jv_makeUtf8Const ("()V", 3);
 967   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 968   init_name = _Jv_makeUtf8Const ("<init>", 6);
 969   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 970
 971   /* Initialize built-in classes to represent primitive TYPEs. */
 972   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1, &_Jv_byteVTable);
 973   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2, &_Jv_shortVTable);
 974   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4, &_Jv_intVTable);
 975   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8, &_Jv_longVTable);
 976   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1, &_Jv_booleanVTable);
 977   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2, &_Jv_charVTable);
 978   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4, &_Jv_floatVTable);
 979   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8, &_Jv_doubleVTable);
 980   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0, &_Jv_voidVTable);
 981
 982   // Turn stack trace generation off while creating exception objects.
 983   _Jv_InitClass (&java::lang::VMThrowable::class$);
 984   java::lang::VMThrowable::trace_enabled = 0;
 985
 986   // We have to initialize this fairly early, to avoid circular class
 987   // initialization.  In particular we want to start the
 988   // initialization of ClassLoader before we start the initialization
 989   // of VMClassLoader.
 990   _Jv_InitClass (&java::lang::ClassLoader::class$);
 991
 992   // Once the bootstrap loader is in place, change it into a kind of
 993   // system loader, by having it read the class path.
 994   gnu::gcj::runtime::VMClassLoader::initialize();
 995
 996   no_memory = new java::lang::OutOfMemoryError;
 997
 998   java::lang::VMThrowable::trace_enabled = 1;
 999
1000 #ifdef USE_LTDL
1001   LTDL_SET_PRELOADED_SYMBOLS ();
1002 #endif
1003
1004   _Jv_platform_initialize ();
1005
1006   _Jv_JNI_Init ();
1007
1008   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
1009
1010   // Start the GC finalizer thread.  A VirtualMachineError can be
1011   // thrown by the runtime if, say, threads aren't available.  In this
1012   // case finalizers simply won't run.
1013   try
1014     {
1015       using namespace gnu::gcj::runtime;
1016       FinalizerThread *ft = new FinalizerThread ();
1017       ft->start ();
1018     }
1019   catch (java::lang::VirtualMachineError *ignore)
1020     {
1021     }
1022
1023   return 0;
1024 }
1025
1026 void
1027 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
1028              bool is_jar)
1029 {
1030   _Jv_SetArgs (argc, argv);
1031
1032   java::lang::Runtime *runtime = NULL;
1033
1034   try
1035     {
1036       // Set this very early so that it is seen when java.lang.System
1037       // is initialized.
1038       if (is_jar)
1039         _Jv_Jar_Class_Path = strdup (name);
1040       _Jv_CreateJavaVM (NULL);
1041
1042       // Get the Runtime here.  We want to initialize it before searching
1043       // for `main'; that way it will be set up if `main' is a JNI method.
1044       runtime = java::lang::Runtime::getRuntime ();
1045
1046 #ifdef DISABLE_MAIN_ARGS
1047       arg_vec = JvConvertArgv (0, 0);
1048 #else
1049       arg_vec = JvConvertArgv (argc - 1, argv + 1);
1050 #endif
1051
1052       using namespace gnu::gcj::runtime;
1053       if (klass)
1054         main_thread = new FirstThread (klass, arg_vec);
1055       else
1056         main_thread = new FirstThread (JvNewStringLatin1 (name),
1057                                        arg_vec, is_jar);
1058     }
1059   catch (java::lang::Throwable *t)
1060     {
1061       java::lang::System::err->println (JvNewStringLatin1
1062         ("Exception during runtime initialization"));
1063       t->printStackTrace();
1064       runtime->exit (1);
1065     }
1066
1067   _Jv_AttachCurrentThread (main_thread);
1068   _Jv_ThreadRun (main_thread);
1069   _Jv_ThreadWait ();
1070
1071   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1072   runtime->exit (status);
1073 }
1074
1075 void
1076 JvRunMain (jclass klass, int argc, const char **argv)
1077 {
1078   _Jv_RunMain (klass, NULL, argc, argv, false);
1079 }
1080
1081 \f
1082
1083 // Parse a string and return a heap size.
1084 static size_t
1085 parse_heap_size (const char *spec)
1086 {
1087   char *end;
1088   unsigned long val = strtoul (spec, &end, 10);
1089   if (*end == 'k' || *end == 'K')
1090     val *= 1024;
1091   else if (*end == 'm' || *end == 'M')
1092     val *= 1048576;
1093   return (size_t) val;
1094 }
1095
1096 // Set the initial heap size.  This might be ignored by the GC layer.
1097 // This must be called before _Jv_RunMain.
1098 void
1099 _Jv_SetInitialHeapSize (const char *arg)
1100 {
1101   size_t size = parse_heap_size (arg);
1102   _Jv_GCSetInitialHeapSize (size);
1103 }
1104
1105 // Set the maximum heap size.  This might be ignored by the GC layer.
1106 // This must be called before _Jv_RunMain.
1107 void
1108 _Jv_SetMaximumHeapSize (const char *arg)
1109 {
1110   size_t size = parse_heap_size (arg);
1111   _Jv_GCSetMaximumHeapSize (size);
1112 }
1113
1114 \f
1115
1116 void *
1117 _Jv_Malloc (jsize size)
1118 {
1119   if (__builtin_expect (size == 0, false))
1120     size = 1;
1121   void *ptr = malloc ((size_t) size);
1122   if (__builtin_expect (ptr == NULL, false))
1123     throw no_memory;
1124   return ptr;
1125 }
1126
1127 void *
1128 _Jv_Realloc (void *ptr, jsize size)
1129 {
1130   if (__builtin_expect (size == 0, false))
1131     size = 1;
1132   ptr = realloc (ptr, (size_t) size);
1133   if (__builtin_expect (ptr == NULL, false))
1134     throw no_memory;
1135   return ptr;
1136 }
1137
1138 void *
1139 _Jv_MallocUnchecked (jsize size)
1140 {
1141   if (__builtin_expect (size == 0, false))
1142     size = 1;
1143   return malloc ((size_t) size);
1144 }
1145
1146 void
1147 _Jv_Free (void* ptr)
1148 {
1149   return free (ptr);
1150 }
1151
1152 \f
1153
1154 // In theory, these routines can be #ifdef'd away on machines which
1155 // support divide overflow signals.  However, we never know if some
1156 // code might have been compiled with "-fuse-divide-subroutine", so we
1157 // always include them in libgcj.
1158
1159 jint
1160 _Jv_divI (jint dividend, jint 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 == (jint) 0x80000000L && divisor == -1)
1170     return dividend;
1171
1172   return dividend / divisor;
1173 }
1174
1175 jint
1176 _Jv_remI (jint dividend, jint divisor)
1177 {
1178   if (__builtin_expect (divisor == 0, false))
1179     {
1180       java::lang::ArithmeticException *arithexception
1181         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1182       throw arithexception;
1183     }
1184
1185   if (dividend == (jint) 0x80000000L && divisor == -1)
1186     return 0;
1187
1188   return dividend % divisor;
1189 }
1190
1191 jlong
1192 _Jv_divJ (jlong dividend, jlong divisor)
1193 {
1194   if (__builtin_expect (divisor == 0, false))
1195     {
1196       java::lang::ArithmeticException *arithexception
1197         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1198       throw arithexception;
1199     }
1200
1201   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1202     return dividend;
1203
1204   return dividend / divisor;
1205 }
1206
1207 jlong
1208 _Jv_remJ (jlong dividend, jlong divisor)
1209 {
1210   if (__builtin_expect (divisor == 0, false))
1211     {
1212       java::lang::ArithmeticException *arithexception
1213         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1214       throw arithexception;
1215     }
1216
1217   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1218     return 0;
1219
1220   return dividend % divisor;
1221 }
1222
1223 \f
1224
1225 // Return true if SELF_KLASS can access a field or method in
1226 // OTHER_KLASS.  The field or method's access flags are specified in
1227 // FLAGS.
1228 jboolean
1229 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1230 {
1231   using namespace java::lang::reflect;
1232   return ((self_klass == other_klass)
1233           || ((flags & Modifier::PUBLIC) != 0)
1234           || (((flags & Modifier::PROTECTED) != 0)
1235               && other_klass->isAssignableFrom (self_klass))
1236           || (((flags & Modifier::PRIVATE) == 0)
1237               && _Jv_ClassNameSamePackage (self_klass->name,
1238                                            other_klass->name)));
1239 }