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