libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <config.h>
  12 #include <platform.h>
  13
  14 #include <stdlib.h>
  15 #include <stdarg.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <signal.h>
  19
  20 #ifdef HAVE_UNISTD_H
  21 #include <unistd.h>
  22 #endif
  23
  24 #include <gcj/cni.h>
  25 #include <jvm.h>
  26 #include <java-signal.h>
  27 #include <java-threads.h>
  28 #include <java-interp.h>
  29
  30 #ifdef ENABLE_JVMPI
  31 #include <jvmpi.h>
  32 #include <java/lang/ThreadGroup.h>
  33 #endif
  34
  35 #ifndef DISABLE_GETENV_PROPERTIES
  36 #include <ctype.h>
  37 #include <java-props.h>
  38 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  39 #else
  40 #define PROCESS_GCJ_PROPERTIES
  41 #endif // DISABLE_GETENV_PROPERTIES
  42
  43 #include <java/lang/Class.h>
  44 #include <java/lang/ClassLoader.h>
  45 #include <java/lang/Runtime.h>
  46 #include <java/lang/String.h>
  47 #include <java/lang/Thread.h>
  48 #include <java/lang/ThreadGroup.h>
  49 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  50 #include <java/lang/ArithmeticException.h>
  51 #include <java/lang/ClassFormatError.h>
  52 #include <java/lang/InternalError.h>
  53 #include <java/lang/NegativeArraySizeException.h>
  54 #include <java/lang/NullPointerException.h>
  55 #include <java/lang/OutOfMemoryError.h>
  56 #include <java/lang/System.h>
  57 #include <java/lang/VMThrowable.h>
  58 #include <java/lang/reflect/Modifier.h>
  59 #include <java/io/PrintStream.h>
  60 #include <java/lang/UnsatisfiedLinkError.h>
  61 #include <java/lang/VirtualMachineError.h>
  62 #include <gnu/gcj/runtime/VMClassLoader.h>
  63 #include <gnu/gcj/runtime/FinalizerThread.h>
  64 #include <gnu/java/lang/MainThread.h>
  65
  66 #ifdef USE_LTDL
  67 #include <ltdl.h>
  68 #endif
  69
  70 // We allocate a single OutOfMemoryError exception which we keep
  71 // around for use if we run out of memory.
  72 static java::lang::OutOfMemoryError *no_memory;
  73
  74 // Number of bytes in largest array object we create.  This could be
  75 // increased to the largest size_t value, so long as the appropriate
  76 // functions are changed to take a size_t argument instead of jint.
  77 #define MAX_OBJECT_SIZE ((1<<31) - 1)
  78
  79 static const char *no_properties[] = { NULL };
  80
  81 // Properties set at compile time.
  82 const char **_Jv_Compiler_Properties = no_properties;
  83
  84 // The JAR file to add to the beginning of java.class.path.
  85 const char *_Jv_Jar_Class_Path;
  86
  87 #ifndef DISABLE_GETENV_PROPERTIES
  88 // Property key/value pairs.
  89 property_pair *_Jv_Environment_Properties;
  90 #endif
  91
  92 // Stash the argv pointer to benefit native libraries that need it.
  93 const char **_Jv_argv;
  94 int _Jv_argc;
  95
  96 // Argument support.
  97 int
  98 _Jv_GetNbArgs (void)
  99 {
 100   // _Jv_argc is 0 if not explicitly initialized.
 101   return _Jv_argc;
 102 }
 103
 104 const char *
 105 _Jv_GetSafeArg (int index)
 106 {
 107   if (index >=0 && index < _Jv_GetNbArgs ())
 108     return _Jv_argv[index];
 109   else
 110     return "";
 111 }
 112
 113 void
 114 _Jv_SetArgs (int argc, const char **argv)
 115 {
 116   _Jv_argc = argc;
 117   _Jv_argv = argv;
 118 }
 119
 120 #ifdef ENABLE_JVMPI
 121 // Pointer to JVMPI notification functions.
 122 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 123 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 124 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 125 #endif
 126 \f
 127
 128 #if defined (HANDLE_SEGV) || defined(HANDLE_FPE)
 129 /* Unblock a signal.  Unless we do this, the signal may only be sent
 130    once.  */
 131 static void
 132 unblock_signal (int signum __attribute__ ((__unused__)))
 133 {
 134 #ifdef _POSIX_VERSION
 135   sigset_t sigs;
 136
 137   sigemptyset (&sigs);
 138   sigaddset (&sigs, signum);
 139   sigprocmask (SIG_UNBLOCK, &sigs, NULL);
 140 #endif
 141 }
 142 #endif
 143
 144 #ifdef HANDLE_SEGV
 145 SIGNAL_HANDLER (catch_segv)
 146 {
 147   java::lang::NullPointerException *nullp
 148     = new java::lang::NullPointerException;
 149   unblock_signal (SIGSEGV);
 150   MAKE_THROW_FRAME (nullp);
 151   throw nullp;
 152 }
 153 #endif
 154
 155 #ifdef HANDLE_FPE
 156 SIGNAL_HANDLER (catch_fpe)
 157 {
 158   java::lang::ArithmeticException *arithexception
 159     = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
 160   unblock_signal (SIGFPE);
 161 #ifdef HANDLE_DIVIDE_OVERFLOW
 162   HANDLE_DIVIDE_OVERFLOW;
 163 #else
 164   MAKE_THROW_FRAME (arithexception);
 165 #endif
 166   throw arithexception;
 167 }
 168 #endif
 169
 170 \f
 171
 172 jboolean
 173 _Jv_equalUtf8Consts (const Utf8Const* a, const Utf8Const *b)
 174 {
 175   int len;
 176   const _Jv_ushort *aptr, *bptr;
 177   if (a == b)
 178     return true;
 179   if (a->hash != b->hash)
 180     return false;
 181   len = a->length;
 182   if (b->length != len)
 183     return false;
 184   aptr = (const _Jv_ushort *)a->data;
 185   bptr = (const _Jv_ushort *)b->data;
 186   len = (len + 1) >> 1;
 187   while (--len >= 0)
 188     if (*aptr++ != *bptr++)
 189       return false;
 190   return true;
 191 }
 192
 193 /* True iff A is equal to STR.
 194    HASH is STR->hashCode().
 195 */
 196
 197 jboolean
 198 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 199 {
 200   if (a->hash != (_Jv_ushort) hash)
 201     return false;
 202   jint len = str->length();
 203   jint i = 0;
 204   jchar *sptr = _Jv_GetStringChars (str);
 205   unsigned char* ptr = (unsigned char*) a->data;
 206   unsigned char* limit = ptr + a->length;
 207   for (;; i++, sptr++)
 208     {
 209       int ch = UTF8_GET (ptr, limit);
 210       if (i == len)
 211         return ch < 0;
 212       if (ch != *sptr)
 213         return false;
 214     }
 215   return true;
 216 }
 217
 218 /* Like _Jv_equal, but stop after N characters.  */
 219 jboolean
 220 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 221 {
 222   jint len = str->length();
 223   jint i = 0;
 224   jchar *sptr = _Jv_GetStringChars (str);
 225   unsigned char* ptr = (unsigned char*) a->data;
 226   unsigned char* limit = ptr + a->length;
 227   for (; n-- > 0; i++, sptr++)
 228     {
 229       int ch = UTF8_GET (ptr, limit);
 230       if (i == len)
 231         return ch < 0;
 232       if (ch != *sptr)
 233         return false;
 234     }
 235   return true;
 236 }
 237
 238 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 239 int
 240 _Jv_strLengthUtf8(char* str, int len)
 241 {
 242   unsigned char* ptr;
 243   unsigned char* limit;
 244   int str_length;
 245
 246   ptr = (unsigned char*) str;
 247   limit = ptr + len;
 248   str_length = 0;
 249   for (; ptr < limit; str_length++)
 250     {
 251       if (UTF8_GET (ptr, limit) < 0)
 252         return (-1);
 253     }
 254   return (str_length);
 255 }
 256
 257 /* Calculate a hash value for a string encoded in Utf8 format.
 258  * This returns the same hash value as specified or java.lang.String.hashCode.
 259  */
 260 jint
 261 _Jv_hashUtf8String (char* str, int len)
 262 {
 263   unsigned char* ptr = (unsigned char*) str;
 264   unsigned char* limit = ptr + len;
 265   jint hash = 0;
 266
 267   for (; ptr < limit;)
 268     {
 269       int ch = UTF8_GET (ptr, limit);
 270       /* Updated specification from
 271          http://www.javasoft.com/docs/books/jls/clarify.html. */
 272       hash = (31 * hash) + ch;
 273     }
 274   return hash;
 275 }
 276
 277 void
 278 _Jv_Utf8Const::init(char *s, int len)
 279 {
 280   ::memcpy (data, s, len);
 281   data[len] = 0;
 282   length = len;
 283   hash = _Jv_hashUtf8String (s, len) & 0xFFFF;
 284 }
 285
 286 _Jv_Utf8Const *
 287 _Jv_makeUtf8Const (char* s, int len)
 288 {
 289   if (len < 0)
 290     len = strlen (s);
 291   Utf8Const* m
 292     = (Utf8Const*) _Jv_AllocBytes (_Jv_Utf8Const::space_needed(s, len));
 293   m->init(s, len);
 294   return m;
 295 }
 296
 297 _Jv_Utf8Const *
 298 _Jv_makeUtf8Const (jstring string)
 299 {
 300   jint hash = string->hashCode ();
 301   jint len = _Jv_GetStringUTFLength (string);
 302
 303   Utf8Const* m = (Utf8Const*)
 304     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 305
 306   m->hash = hash;
 307   m->length = len;
 308
 309   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 310   m->data[len] = 0;
 311
 312   return m;
 313 }
 314
 315 \f
 316
 317 #ifdef DEBUG
 318 void
 319 _Jv_Abort (const char *function, const char *file, int line,
 320            const char *message)
 321 #else
 322 void
 323 _Jv_Abort (const char *, const char *, int, const char *message)
 324 #endif
 325 {
 326 #ifdef DEBUG
 327   fprintf (stderr,
 328            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 329            message, function, file, line);
 330 #else
 331   fprintf (stderr, "libgcj failure: %s\n", message);
 332 #endif
 333   abort ();
 334 }
 335
 336 static void
 337 fail_on_finalization (jobject)
 338 {
 339   JvFail ("object was finalized");
 340 }
 341
 342 void
 343 _Jv_GCWatch (jobject obj)
 344 {
 345   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 346 }
 347
 348 void
 349 _Jv_ThrowBadArrayIndex(jint bad_index)
 350 {
 351   throw new java::lang::ArrayIndexOutOfBoundsException
 352     (java::lang::String::valueOf (bad_index));
 353 }
 354
 355 void
 356 _Jv_ThrowNullPointerException ()
 357 {
 358   throw new java::lang::NullPointerException;
 359 }
 360
 361 // Explicitly throw a no memory exception.
 362 // The collector calls this when it encounters an out-of-memory condition.
 363 void _Jv_ThrowNoMemory()
 364 {
 365   throw no_memory;
 366 }
 367
 368 #ifdef ENABLE_JVMPI
 369 # define JVMPI_NOTIFY_ALLOC(klass,size,obj) \
 370     if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false)) \
 371       jvmpi_notify_alloc(klass,size,obj);
 372 static void
 373 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 374 {
 375   // Service JVMPI allocation request.
 376   JVMPI_Event event;
 377
 378   event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 379   event.env_id = NULL;
 380   event.u.obj_alloc.arena_id = 0;
 381   event.u.obj_alloc.class_id = (jobjectID) klass;
 382   event.u.obj_alloc.is_array = 0;
 383   event.u.obj_alloc.size = size;
 384   event.u.obj_alloc.obj_id = (jobjectID) obj;
 385
 386   // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 387   // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 388   // More importantly, I don't see the need for disabling GC, since we
 389   // blatantly have a pointer to obj on our stack, ensuring that the
 390   // object can't be collected.  Even for a nonconservative collector,
 391   // it appears to me that this must be true, since we are about to
 392   // return obj. Isn't this whole approach way too intrusive for
 393   // a useful profiling interface?                      - HB
 394   _Jv_DisableGC ();
 395   (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 396   _Jv_EnableGC ();
 397 }
 398 #else /* !ENABLE_JVMPI */
 399 # define JVMPI_NOTIFY_ALLOC(klass,size,obj) /* do nothing */
 400 #endif
 401
 402 // Allocate a new object of class KLASS.
 403 // First a version that assumes that we have no finalizer, and that
 404 // the class is already initialized.
 405 // If we know that JVMPI is disabled, this can be replaced by a direct call
 406 // to the allocator for the appropriate GC.
 407 jobject
 408 _Jv_AllocObjectNoInitNoFinalizer (jclass klass)
 409 {
 410   jint size = klass->size ();
 411   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 412   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 413   return obj;
 414 }
 415
 416 // And now a version that initializes if necessary.
 417 jobject
 418 _Jv_AllocObjectNoFinalizer (jclass klass)
 419 {
 420   _Jv_InitClass (klass);
 421   jint size = klass->size ();
 422   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 423   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 424   return obj;
 425 }
 426
 427 // And now the general version that registers a finalizer if necessary.
 428 jobject
 429 _Jv_AllocObject (jclass klass)
 430 {
 431   jobject obj = _Jv_AllocObjectNoFinalizer (klass);
 432
 433   // We assume that the compiler only generates calls to this routine
 434   // if there really is an interesting finalizer.
 435   // Unfortunately, we still have to the dynamic test, since there may
 436   // be cni calls to this routine.
 437   // Note that on IA64 get_finalizer() returns the starting address of the
 438   // function, not a function pointer.  Thus this still works.
 439   if (klass->vtable->get_finalizer ()
 440       != java::lang::Object::class$.vtable->get_finalizer ())
 441     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 442   return obj;
 443 }
 444
 445 // Allocate a String, including variable length storage.
 446 jstring
 447 _Jv_AllocString(jsize len)
 448 {
 449   using namespace java::lang;
 450
 451   jsize sz = sizeof(java::lang::String) + len * sizeof(jchar);
 452
 453   // We assert that for strings allocated this way, the data field
 454   // will always point to the object itself.  Thus there is no reason
 455   // for the garbage collector to scan any of it.
 456   // Furthermore, we're about to overwrite the string data, so
 457   // initialization of the object is not an issue.
 458
 459   // String needs no initialization, and there is no finalizer, so
 460   // we can go directly to the collector's allocator interface.
 461   jstring obj = (jstring) _Jv_AllocPtrFreeObj(sz, &String::class$);
 462
 463   obj->data = obj;
 464   obj->boffset = sizeof(java::lang::String);
 465   obj->count = len;
 466   obj->cachedHashCode = 0;
 467
 468   JVMPI_NOTIFY_ALLOC (&String::class$, sz, obj);
 469
 470   return obj;
 471 }
 472
 473 // A version of the above that assumes the object contains no pointers,
 474 // and requires no finalization.  This can't happen if we need pointers
 475 // to locks.
 476 #ifdef JV_HASH_SYNCHRONIZATION
 477 jobject
 478 _Jv_AllocPtrFreeObject (jclass klass)
 479 {
 480   _Jv_InitClass (klass);
 481   jint size = klass->size ();
 482
 483   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 484
 485   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 486
 487   return obj;
 488 }
 489 #endif /* JV_HASH_SYNCHRONIZATION */
 490
 491
 492 // Allocate a new array of Java objects.  Each object is of type
 493 // `elementClass'.  `init' is used to initialize each slot in the
 494 // array.
 495 jobjectArray
 496 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 497 {
 498   if (__builtin_expect (count < 0, false))
 499     throw new java::lang::NegativeArraySizeException;
 500
 501   JvAssert (! elementClass->isPrimitive ());
 502
 503   // Ensure that elements pointer is properly aligned.
 504   jobjectArray obj = NULL;
 505   size_t size = (size_t) elements (obj);
 506   // Check for overflow.
 507   if (__builtin_expect ((size_t) count >
 508                         (MAX_OBJECT_SIZE - 1 - size) / sizeof (jobject), false))
 509     throw no_memory;
 510
 511   size += count * sizeof (jobject);
 512
 513   jclass klass = _Jv_GetArrayClass (elementClass,
 514                                     elementClass->getClassLoaderInternal());
 515
 516   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 517   // Cast away const.
 518   jsize *lp = const_cast<jsize *> (&obj->length);
 519   *lp = count;
 520   // We know the allocator returns zeroed memory.  So don't bother
 521   // zeroing it again.
 522   if (init)
 523     {
 524       jobject *ptr = elements(obj);
 525       while (--count >= 0)
 526         *ptr++ = init;
 527     }
 528   return obj;
 529 }
 530
 531 // Allocate a new array of primitives.  ELTYPE is the type of the
 532 // element, COUNT is the size of the array.
 533 jobject
 534 _Jv_NewPrimArray (jclass eltype, jint count)
 535 {
 536   int elsize = eltype->size();
 537   if (__builtin_expect (count < 0, false))
 538     throw new java::lang::NegativeArraySizeException;
 539
 540   JvAssert (eltype->isPrimitive ());
 541   jobject dummy = NULL;
 542   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 543
 544   // Check for overflow.
 545   if (__builtin_expect ((size_t) count >
 546                         (MAX_OBJECT_SIZE - size) / elsize, false))
 547     throw no_memory;
 548
 549   jclass klass = _Jv_GetArrayClass (eltype, 0);
 550
 551 # ifdef JV_HASH_SYNCHRONIZATION
 552   // Since the vtable is always statically allocated,
 553   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 554   __JArray *arr =
 555     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 556   memset((char *)arr + size, 0, elsize * count);
 557 # else
 558   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 559   // Note that we assume we are given zeroed memory by the allocator.
 560 # endif
 561   // Cast away const.
 562   jsize *lp = const_cast<jsize *> (&arr->length);
 563   *lp = count;
 564
 565   return arr;
 566 }
 567
 568 jobject
 569 _Jv_NewArray (jint type, jint size)
 570 {
 571   switch (type)
 572     {
 573       case  4:  return JvNewBooleanArray (size);
 574       case  5:  return JvNewCharArray (size);
 575       case  6:  return JvNewFloatArray (size);
 576       case  7:  return JvNewDoubleArray (size);
 577       case  8:  return JvNewByteArray (size);
 578       case  9:  return JvNewShortArray (size);
 579       case 10:  return JvNewIntArray (size);
 580       case 11:  return JvNewLongArray (size);
 581     }
 582   throw new java::lang::InternalError
 583     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 584 }
 585
 586 // Allocate a possibly multi-dimensional array but don't check that
 587 // any array length is <0.
 588 static jobject
 589 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 590 {
 591   JvAssert (type->isArray());
 592   jclass element_type = type->getComponentType();
 593   jobject result;
 594   if (element_type->isPrimitive())
 595     result = _Jv_NewPrimArray (element_type, sizes[0]);
 596   else
 597     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 598
 599   if (dimensions > 1)
 600     {
 601       JvAssert (! element_type->isPrimitive());
 602       JvAssert (element_type->isArray());
 603       jobject *contents = elements ((jobjectArray) result);
 604       for (int i = 0; i < sizes[0]; ++i)
 605         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 606                                                   sizes + 1);
 607     }
 608
 609   return result;
 610 }
 611
 612 jobject
 613 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 614 {
 615   for (int i = 0; i < dimensions; ++i)
 616     if (sizes[i] < 0)
 617       throw new java::lang::NegativeArraySizeException;
 618
 619   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 620 }
 621
 622 jobject
 623 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 624 {
 625   va_list args;
 626   jint sizes[dimensions];
 627   va_start (args, dimensions);
 628   for (int i = 0; i < dimensions; ++i)
 629     {
 630       jint size = va_arg (args, jint);
 631       if (size < 0)
 632         throw new java::lang::NegativeArraySizeException;
 633       sizes[i] = size;
 634     }
 635   va_end (args);
 636
 637   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 638 }
 639
 640 \f
 641
 642 // Ensure 8-byte alignment, for hash synchronization.
 643 #define DECLARE_PRIM_TYPE(NAME)                 \
 644   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 645
 646 DECLARE_PRIM_TYPE(byte)
 647 DECLARE_PRIM_TYPE(short)
 648 DECLARE_PRIM_TYPE(int)
 649 DECLARE_PRIM_TYPE(long)
 650 DECLARE_PRIM_TYPE(boolean)
 651 DECLARE_PRIM_TYPE(char)
 652 DECLARE_PRIM_TYPE(float)
 653 DECLARE_PRIM_TYPE(double)
 654 DECLARE_PRIM_TYPE(void)
 655
 656 void
 657 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len)
 658 {
 659   using namespace java::lang::reflect;
 660
 661   // We must set the vtable for the class; the Java constructor
 662   // doesn't do this.
 663   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 664
 665   // Initialize the fields we care about.  We do this in the same
 666   // order they are declared in Class.h.
 667   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 668   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 669   cl->method_count = sig;
 670   cl->size_in_bytes = len;
 671   cl->vtable = JV_PRIMITIVE_VTABLE;
 672   cl->state = JV_STATE_DONE;
 673   cl->depth = -1;
 674 }
 675
 676 jclass
 677 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 678 {
 679   switch (*sig)
 680     {
 681     case 'B':
 682       return JvPrimClass (byte);
 683     case 'S':
 684       return JvPrimClass (short);
 685     case 'I':
 686       return JvPrimClass (int);
 687     case 'J':
 688       return JvPrimClass (long);
 689     case 'Z':
 690       return JvPrimClass (boolean);
 691     case 'C':
 692       return JvPrimClass (char);
 693     case 'F':
 694       return JvPrimClass (float);
 695     case 'D':
 696       return JvPrimClass (double);
 697     case 'V':
 698       return JvPrimClass (void);
 699     case 'L':
 700       {
 701         int i;
 702         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 703           ;
 704         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 705         return _Jv_FindClass (name, loader);
 706       }
 707     case '[':
 708       {
 709         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 710         if (! klass)
 711           return NULL;
 712         return _Jv_GetArrayClass (klass, loader);
 713       }
 714     }
 715
 716   return NULL;                  // Placate compiler.
 717 }
 718
 719 \f
 720
 721 JArray<jstring> *
 722 JvConvertArgv (int argc, const char **argv)
 723 {
 724   if (argc < 0)
 725     argc = 0;
 726   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 727   jobject *ptr = elements(ar);
 728   jbyteArray bytes = NULL;
 729   for (int i = 0;  i < argc;  i++)
 730     {
 731       const char *arg = argv[i];
 732       int len = strlen (arg);
 733       if (bytes == NULL || bytes->length < len)
 734         bytes = JvNewByteArray (len);
 735       jbyte *bytePtr = elements (bytes);
 736       // We assume jbyte == char.
 737       memcpy (bytePtr, arg, len);
 738
 739       // Now convert using the default encoding.
 740       *ptr++ = new java::lang::String (bytes, 0, len);
 741     }
 742   return (JArray<jstring>*) ar;
 743 }
 744
 745 // FIXME: These variables are static so that they will be
 746 // automatically scanned by the Boehm collector.  This is needed
 747 // because with qthreads the collector won't scan the initial stack --
 748 // it will only scan the qthreads stacks.
 749
 750 // Command line arguments.
 751 static JArray<jstring> *arg_vec;
 752
 753 // The primary thread.
 754 static java::lang::Thread *main_thread;
 755
 756 #ifndef DISABLE_GETENV_PROPERTIES
 757
 758 static char *
 759 next_property_key (char *s, size_t *length)
 760 {
 761   size_t l = 0;
 762
 763   JvAssert (s);
 764
 765   // Skip over whitespace
 766   while (isspace (*s))
 767     s++;
 768
 769   // If we've reached the end, return NULL.  Also return NULL if for
 770   // some reason we've come across a malformed property string.
 771   if (*s == 0
 772       || *s == ':'
 773       || *s == '=')
 774     return NULL;
 775
 776   // Determine the length of the property key.
 777   while (s[l] != 0
 778          && ! isspace (s[l])
 779          && s[l] != ':'
 780          && s[l] != '=')
 781     {
 782       if (s[l] == '\\'
 783           && s[l+1] != 0)
 784         l++;
 785       l++;
 786     }
 787
 788   *length = l;
 789
 790   return s;
 791 }
 792
 793 static char *
 794 next_property_value (char *s, size_t *length)
 795 {
 796   size_t l = 0;
 797
 798   JvAssert (s);
 799
 800   while (isspace (*s))
 801     s++;
 802
 803   if (*s == ':'
 804       || *s == '=')
 805     s++;
 806
 807   while (isspace (*s))
 808     s++;
 809
 810   // If we've reached the end, return NULL.
 811   if (*s == 0)
 812     return NULL;
 813
 814   // Determine the length of the property value.
 815   while (s[l] != 0
 816          && ! isspace (s[l])
 817          && s[l] != ':'
 818          && s[l] != '=')
 819     {
 820       if (s[l] == '\\'
 821           && s[l+1] != 0)
 822         l += 2;
 823       else
 824         l++;
 825     }
 826
 827   *length = l;
 828
 829   return s;
 830 }
 831
 832 static void
 833 process_gcj_properties ()
 834 {
 835   char *props = getenv("GCJ_PROPERTIES");
 836   char *p = props;
 837   size_t length;
 838   size_t property_count = 0;
 839
 840   if (NULL == props)
 841     return;
 842
 843   // Whip through props quickly in order to count the number of
 844   // property values.
 845   while (p && (p = next_property_key (p, &length)))
 846     {
 847       // Skip to the end of the key
 848       p += length;
 849
 850       p = next_property_value (p, &length);
 851       if (p)
 852         p += length;
 853
 854       property_count++;
 855     }
 856
 857   // Allocate an array of property value/key pairs.
 858   _Jv_Environment_Properties =
 859     (property_pair *) malloc (sizeof(property_pair)
 860                               * (property_count + 1));
 861
 862   // Go through the properties again, initializing _Jv_Properties
 863   // along the way.
 864   p = props;
 865   property_count = 0;
 866   while (p && (p = next_property_key (p, &length)))
 867     {
 868       _Jv_Environment_Properties[property_count].key = p;
 869       _Jv_Environment_Properties[property_count].key_length = length;
 870
 871       // Skip to the end of the key
 872       p += length;
 873
 874       p = next_property_value (p, &length);
 875
 876       _Jv_Environment_Properties[property_count].value = p;
 877       _Jv_Environment_Properties[property_count].value_length = length;
 878
 879       if (p)
 880         p += length;
 881
 882       property_count++;
 883     }
 884   memset ((void *) &_Jv_Environment_Properties[property_count],
 885           0, sizeof (property_pair));
 886
 887   // Null terminate the strings.
 888   for (property_pair *prop = &_Jv_Environment_Properties[0];
 889        prop->key != NULL;
 890        prop++)
 891     {
 892       prop->key[prop->key_length] = 0;
 893       prop->value[prop->value_length] = 0;
 894     }
 895 }
 896 #endif // DISABLE_GETENV_PROPERTIES
 897
 898 namespace gcj
 899 {
 900   _Jv_Utf8Const *void_signature;
 901   _Jv_Utf8Const *clinit_name;
 902   _Jv_Utf8Const *init_name;
 903   _Jv_Utf8Const *finit_name;
 904
 905   bool runtimeInitialized = false;
 906 }
 907
 908 jint
 909 _Jv_CreateJavaVM (void* /*vm_args*/)
 910 {
 911   using namespace gcj;
 912
 913   if (runtimeInitialized)
 914     return -1;
 915
 916   runtimeInitialized = true;
 917
 918   PROCESS_GCJ_PROPERTIES;
 919
 920   _Jv_InitThreads ();
 921   _Jv_InitGC ();
 922   _Jv_InitializeSyncMutex ();
 923
 924 #ifdef INTERPRETER
 925   _Jv_InitInterpreter ();
 926 #endif
 927
 928 #ifdef HANDLE_SEGV
 929   INIT_SEGV;
 930 #endif
 931
 932 #ifdef HANDLE_FPE
 933   INIT_FPE;
 934 #endif
 935
 936   /* Initialize Utf8 constants declared in jvm.h. */
 937   void_signature = _Jv_makeUtf8Const ("()V", 3);
 938   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 939   init_name = _Jv_makeUtf8Const ("<init>", 6);
 940   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 941
 942   /* Initialize built-in classes to represent primitive TYPEs. */
 943   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1);
 944   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2);
 945   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4);
 946   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8);
 947   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1);
 948   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2);
 949   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4);
 950   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8);
 951   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0);
 952
 953   // Turn stack trace generation off while creating exception objects.
 954   _Jv_InitClass (&java::lang::VMThrowable::class$);
 955   java::lang::VMThrowable::trace_enabled = 0;
 956
 957   // We have to initialize this fairly early, to avoid circular class
 958   // initialization.  In particular we want to start the
 959   // initialization of ClassLoader before we start the initialization
 960   // of VMClassLoader.
 961   _Jv_InitClass (&java::lang::ClassLoader::class$);
 962
 963   // Once the bootstrap loader is in place, change it into a kind of
 964   // system loader, by having it read the class path.
 965   gnu::gcj::runtime::VMClassLoader::initialize();
 966
 967   no_memory = new java::lang::OutOfMemoryError;
 968
 969   java::lang::VMThrowable::trace_enabled = 1;
 970
 971 #ifdef USE_LTDL
 972   LTDL_SET_PRELOADED_SYMBOLS ();
 973 #endif
 974
 975   _Jv_platform_initialize ();
 976
 977   _Jv_JNI_Init ();
 978
 979   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
 980
 981   // Start the GC finalizer thread.  A VirtualMachineError can be
 982   // thrown by the runtime if, say, threads aren't available.
 983   try
 984     {
 985       using namespace gnu::gcj::runtime;
 986       FinalizerThread *ft = new FinalizerThread ();
 987       ft->start ();
 988     }
 989   catch (java::lang::VirtualMachineError *ignore)
 990     {
 991     }
 992
 993   return 0;
 994 }
 995
 996 void
 997 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 998              bool is_jar)
 999 {
1000 #ifndef DISABLE_MAIN_ARGS
1001   _Jv_SetArgs (argc, argv);
1002 #endif
1003
1004   java::lang::Runtime *runtime = NULL;
1005
1006   try
1007     {
1008       // Set this very early so that it is seen when java.lang.System
1009       // is initialized.
1010       if (is_jar)
1011         _Jv_Jar_Class_Path = strdup (name);
1012       _Jv_CreateJavaVM (NULL);
1013
1014       // Get the Runtime here.  We want to initialize it before searching
1015       // for `main'; that way it will be set up if `main' is a JNI method.
1016       runtime = java::lang::Runtime::getRuntime ();
1017
1018 #ifdef DISABLE_MAIN_ARGS
1019       arg_vec = JvConvertArgv (0, 0);
1020 #else
1021       arg_vec = JvConvertArgv (argc - 1, argv + 1);
1022 #endif
1023
1024       using namespace gnu::java::lang;
1025       if (klass)
1026         main_thread = new MainThread (klass, arg_vec);
1027       else
1028         main_thread = new MainThread (JvNewStringLatin1 (name),
1029                                       arg_vec, is_jar);
1030     }
1031   catch (java::lang::Throwable *t)
1032     {
1033       java::lang::System::err->println (JvNewStringLatin1
1034         ("Exception during runtime initialization"));
1035       t->printStackTrace();
1036       runtime->exit (1);
1037     }
1038
1039   _Jv_AttachCurrentThread (main_thread);
1040   _Jv_ThreadRun (main_thread);
1041   _Jv_ThreadWait ();
1042
1043   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1044   runtime->exit (status);
1045 }
1046
1047 void
1048 JvRunMain (jclass klass, int argc, const char **argv)
1049 {
1050   _Jv_RunMain (klass, NULL, argc, argv, false);
1051 }
1052
1053 \f
1054
1055 // Parse a string and return a heap size.
1056 static size_t
1057 parse_heap_size (const char *spec)
1058 {
1059   char *end;
1060   unsigned long val = strtoul (spec, &end, 10);
1061   if (*end == 'k' || *end == 'K')
1062     val *= 1024;
1063   else if (*end == 'm' || *end == 'M')
1064     val *= 1048576;
1065   return (size_t) val;
1066 }
1067
1068 // Set the initial heap size.  This might be ignored by the GC layer.
1069 // This must be called before _Jv_RunMain.
1070 void
1071 _Jv_SetInitialHeapSize (const char *arg)
1072 {
1073   size_t size = parse_heap_size (arg);
1074   _Jv_GCSetInitialHeapSize (size);
1075 }
1076
1077 // Set the maximum heap size.  This might be ignored by the GC layer.
1078 // This must be called before _Jv_RunMain.
1079 void
1080 _Jv_SetMaximumHeapSize (const char *arg)
1081 {
1082   size_t size = parse_heap_size (arg);
1083   _Jv_GCSetMaximumHeapSize (size);
1084 }
1085
1086 \f
1087
1088 void *
1089 _Jv_Malloc (jsize size)
1090 {
1091   if (__builtin_expect (size == 0, false))
1092     size = 1;
1093   void *ptr = malloc ((size_t) size);
1094   if (__builtin_expect (ptr == NULL, false))
1095     throw no_memory;
1096   return ptr;
1097 }
1098
1099 void *
1100 _Jv_Realloc (void *ptr, jsize size)
1101 {
1102   if (__builtin_expect (size == 0, false))
1103     size = 1;
1104   ptr = realloc (ptr, (size_t) size);
1105   if (__builtin_expect (ptr == NULL, false))
1106     throw no_memory;
1107   return ptr;
1108 }
1109
1110 void *
1111 _Jv_MallocUnchecked (jsize size)
1112 {
1113   if (__builtin_expect (size == 0, false))
1114     size = 1;
1115   return malloc ((size_t) size);
1116 }
1117
1118 void
1119 _Jv_Free (void* ptr)
1120 {
1121   return free (ptr);
1122 }
1123
1124 \f
1125
1126 // In theory, these routines can be #ifdef'd away on machines which
1127 // support divide overflow signals.  However, we never know if some
1128 // code might have been compiled with "-fuse-divide-subroutine", so we
1129 // always include them in libgcj.
1130
1131 jint
1132 _Jv_divI (jint dividend, jint 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 == (jint) 0x80000000L && divisor == -1)
1142     return dividend;
1143
1144   return dividend / divisor;
1145 }
1146
1147 jint
1148 _Jv_remI (jint dividend, jint 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 == (jint) 0x80000000L && divisor == -1)
1158     return 0;
1159
1160   return dividend % divisor;
1161 }
1162
1163 jlong
1164 _Jv_divJ (jlong dividend, jlong divisor)
1165 {
1166   if (__builtin_expect (divisor == 0, false))
1167     {
1168       java::lang::ArithmeticException *arithexception
1169         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1170       throw arithexception;
1171     }
1172
1173   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1174     return dividend;
1175
1176   return dividend / divisor;
1177 }
1178
1179 jlong
1180 _Jv_remJ (jlong dividend, jlong divisor)
1181 {
1182   if (__builtin_expect (divisor == 0, false))
1183     {
1184       java::lang::ArithmeticException *arithexception
1185         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1186       throw arithexception;
1187     }
1188
1189   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1190     return 0;
1191
1192   return dividend % divisor;
1193 }
1194
1195 \f
1196
1197 // Return true if SELF_KLASS can access a field or method in
1198 // OTHER_KLASS.  The field or method's access flags are specified in
1199 // FLAGS.
1200 jboolean
1201 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1202 {
1203   using namespace java::lang::reflect;
1204   return ((self_klass == other_klass)
1205           || ((flags & Modifier::PUBLIC) != 0)
1206           || (((flags & Modifier::PROTECTED) != 0)
1207               && other_klass->isAssignableFrom (self_klass))
1208           || (((flags & Modifier::PRIVATE) == 0)
1209               && _Jv_ClassNameSamePackage (self_klass->name,
1210                                            other_klass->name)));
1211 }