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 static jint
 259 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 _Jv_Utf8Const *
 276 _Jv_makeUtf8Const (char* s, int len)
 277 {
 278   if (len < 0)
 279     len = strlen (s);
 280   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 281   memcpy (m->data, s, len);
 282   m->data[len] = 0;
 283   m->length = len;
 284   m->hash = hashUtf8String (s, len) & 0xFFFF;
 285   return (m);
 286 }
 287
 288 _Jv_Utf8Const *
 289 _Jv_makeUtf8Const (jstring string)
 290 {
 291   jint hash = string->hashCode ();
 292   jint len = _Jv_GetStringUTFLength (string);
 293
 294   Utf8Const* m = (Utf8Const*)
 295     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 296
 297   m->hash = hash;
 298   m->length = len;
 299
 300   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 301   m->data[len] = 0;
 302
 303   return m;
 304 }
 305
 306 \f
 307
 308 #ifdef DEBUG
 309 void
 310 _Jv_Abort (const char *function, const char *file, int line,
 311            const char *message)
 312 #else
 313 void
 314 _Jv_Abort (const char *, const char *, int, const char *message)
 315 #endif
 316 {
 317 #ifdef DEBUG
 318   fprintf (stderr,
 319            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 320            message, function, file, line);
 321 #else
 322   fprintf (stderr, "libgcj failure: %s\n", message);
 323 #endif
 324   abort ();
 325 }
 326
 327 static void
 328 fail_on_finalization (jobject)
 329 {
 330   JvFail ("object was finalized");
 331 }
 332
 333 void
 334 _Jv_GCWatch (jobject obj)
 335 {
 336   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 337 }
 338
 339 void
 340 _Jv_ThrowBadArrayIndex(jint bad_index)
 341 {
 342   throw new java::lang::ArrayIndexOutOfBoundsException
 343     (java::lang::String::valueOf (bad_index));
 344 }
 345
 346 void
 347 _Jv_ThrowNullPointerException ()
 348 {
 349   throw new java::lang::NullPointerException;
 350 }
 351
 352 // Explicitly throw a no memory exception.
 353 // The collector calls this when it encounters an out-of-memory condition.
 354 void _Jv_ThrowNoMemory()
 355 {
 356   throw no_memory;
 357 }
 358
 359 #ifdef ENABLE_JVMPI
 360 static void
 361 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 362 {
 363   // Service JVMPI allocation request.
 364   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 365     {
 366       JVMPI_Event event;
 367
 368       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 369       event.env_id = NULL;
 370       event.u.obj_alloc.arena_id = 0;
 371       event.u.obj_alloc.class_id = (jobjectID) klass;
 372       event.u.obj_alloc.is_array = 0;
 373       event.u.obj_alloc.size = size;
 374       event.u.obj_alloc.obj_id = (jobjectID) obj;
 375
 376       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 377       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 378       // More importantly, I don't see the need for disabling GC, since we
 379       // blatantly have a pointer to obj on our stack, ensuring that the
 380       // object can't be collected.  Even for a nonconservative collector,
 381       // it appears to me that this must be true, since we are about to
 382       // return obj. Isn't this whole approach way too intrusive for
 383       // a useful profiling interface?                  - HB
 384       _Jv_DisableGC ();
 385       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 386       _Jv_EnableGC ();
 387     }
 388 }
 389 #else /* !ENABLE_JVMPI */
 390 # define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 391 #endif
 392
 393 // Allocate a new object of class KLASS.
 394 // First a version that assumes that we have no finalizer, and that
 395 // the class is already initialized.
 396 // If we know that JVMPI is disabled, this can be replaced by a direct call
 397 // to the allocator for the appropriate GC.
 398 jobject
 399 _Jv_AllocObjectNoInitNoFinalizer (jclass klass)
 400 {
 401   jint size = klass->size ();
 402   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 403   jvmpi_notify_alloc (klass, size, obj);
 404   return obj;
 405 }
 406
 407 // And now a version that initializes if necessary.
 408 jobject
 409 _Jv_AllocObjectNoFinalizer (jclass klass)
 410 {
 411   _Jv_InitClass (klass);
 412   jint size = klass->size ();
 413   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 414   jvmpi_notify_alloc (klass, size, obj);
 415   return obj;
 416 }
 417
 418 // And now the general version that registers a finalizer if necessary.
 419 jobject
 420 _Jv_AllocObject (jclass klass)
 421 {
 422   jobject obj = _Jv_AllocObjectNoFinalizer (klass);
 423
 424   // We assume that the compiler only generates calls to this routine
 425   // if there really is an interesting finalizer.
 426   // Unfortunately, we still have to the dynamic test, since there may
 427   // be cni calls to this routine.
 428   // Note that on IA64 get_finalizer() returns the starting address of the
 429   // function, not a function pointer.  Thus this still works.
 430   if (klass->vtable->get_finalizer ()
 431       != java::lang::Object::class$.vtable->get_finalizer ())
 432     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 433   return obj;
 434 }
 435
 436 // Allocate a String, including variable length storage.
 437 jstring
 438 _Jv_AllocString(jsize len)
 439 {
 440   using namespace java::lang;
 441
 442   jsize sz = sizeof(java::lang::String) + len * sizeof(jchar);
 443
 444   // We assert that for strings allocated this way, the data field
 445   // will always point to the object itself.  Thus there is no reason
 446   // for the garbage collector to scan any of it.
 447   // Furthermore, we're about to overwrite the string data, so
 448   // initialization of the object is not an issue.
 449
 450   // String needs no initialization, and there is no finalizer, so
 451   // we can go directly to the collector's allocator interface.
 452   jstring obj = (jstring) _Jv_AllocPtrFreeObj(sz, &String::class$);
 453
 454   obj->data = obj;
 455   obj->boffset = sizeof(java::lang::String);
 456   obj->count = len;
 457   obj->cachedHashCode = 0;
 458
 459 #ifdef ENABLE_JVMPI
 460   // Service JVMPI request.
 461
 462   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 463     {
 464       JVMPI_Event event;
 465
 466       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 467       event.env_id = NULL;
 468       event.u.obj_alloc.arena_id = 0;
 469       event.u.obj_alloc.class_id = (jobjectID) &String::class$;
 470       event.u.obj_alloc.is_array = 0;
 471       event.u.obj_alloc.size = sz;
 472       event.u.obj_alloc.obj_id = (jobjectID) obj;
 473
 474       _Jv_DisableGC ();
 475       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 476       _Jv_EnableGC ();
 477     }
 478 #endif
 479
 480   return obj;
 481 }
 482
 483 // A version of the above that assumes the object contains no pointers,
 484 // and requires no finalization.  This can't happen if we need pointers
 485 // to locks.
 486 #ifdef JV_HASH_SYNCHRONIZATION
 487 jobject
 488 _Jv_AllocPtrFreeObject (jclass klass)
 489 {
 490   _Jv_InitClass (klass);
 491   jint size = klass->size ();
 492
 493   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 494
 495 #ifdef ENABLE_JVMPI
 496   // Service JVMPI request.
 497
 498   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 499     {
 500       JVMPI_Event event;
 501
 502       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 503       event.env_id = NULL;
 504       event.u.obj_alloc.arena_id = 0;
 505       event.u.obj_alloc.class_id = (jobjectID) klass;
 506       event.u.obj_alloc.is_array = 0;
 507       event.u.obj_alloc.size = size;
 508       event.u.obj_alloc.obj_id = (jobjectID) obj;
 509
 510       _Jv_DisableGC ();
 511       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 512       _Jv_EnableGC ();
 513     }
 514 #endif
 515
 516   return obj;
 517 }
 518 #endif /* JV_HASH_SYNCHRONIZATION */
 519
 520
 521 // Allocate a new array of Java objects.  Each object is of type
 522 // `elementClass'.  `init' is used to initialize each slot in the
 523 // array.
 524 jobjectArray
 525 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 526 {
 527   if (__builtin_expect (count < 0, false))
 528     throw new java::lang::NegativeArraySizeException;
 529
 530   JvAssert (! elementClass->isPrimitive ());
 531
 532   // Ensure that elements pointer is properly aligned.
 533   jobjectArray obj = NULL;
 534   size_t size = (size_t) elements (obj);
 535   // Check for overflow.
 536   if (__builtin_expect ((size_t) count >
 537                         (MAX_OBJECT_SIZE - 1 - size) / sizeof (jobject), false))
 538     throw no_memory;
 539
 540   size += count * sizeof (jobject);
 541
 542   jclass klass = _Jv_GetArrayClass (elementClass,
 543                                     elementClass->getClassLoaderInternal());
 544
 545   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 546   // Cast away const.
 547   jsize *lp = const_cast<jsize *> (&obj->length);
 548   *lp = count;
 549   // We know the allocator returns zeroed memory.  So don't bother
 550   // zeroing it again.
 551   if (init)
 552     {
 553       jobject *ptr = elements(obj);
 554       while (--count >= 0)
 555         *ptr++ = init;
 556     }
 557   return obj;
 558 }
 559
 560 // Allocate a new array of primitives.  ELTYPE is the type of the
 561 // element, COUNT is the size of the array.
 562 jobject
 563 _Jv_NewPrimArray (jclass eltype, jint count)
 564 {
 565   int elsize = eltype->size();
 566   if (__builtin_expect (count < 0, false))
 567     throw new java::lang::NegativeArraySizeException;
 568
 569   JvAssert (eltype->isPrimitive ());
 570   jobject dummy = NULL;
 571   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 572
 573   // Check for overflow.
 574   if (__builtin_expect ((size_t) count >
 575                         (MAX_OBJECT_SIZE - size) / elsize, false))
 576     throw no_memory;
 577
 578   jclass klass = _Jv_GetArrayClass (eltype, 0);
 579
 580 # ifdef JV_HASH_SYNCHRONIZATION
 581   // Since the vtable is always statically allocated,
 582   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 583   __JArray *arr =
 584     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 585   memset((char *)arr + size, 0, elsize * count);
 586 # else
 587   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 588   // Note that we assume we are given zeroed memory by the allocator.
 589 # endif
 590   // Cast away const.
 591   jsize *lp = const_cast<jsize *> (&arr->length);
 592   *lp = count;
 593
 594   return arr;
 595 }
 596
 597 jobject
 598 _Jv_NewArray (jint type, jint size)
 599 {
 600   switch (type)
 601     {
 602       case  4:  return JvNewBooleanArray (size);
 603       case  5:  return JvNewCharArray (size);
 604       case  6:  return JvNewFloatArray (size);
 605       case  7:  return JvNewDoubleArray (size);
 606       case  8:  return JvNewByteArray (size);
 607       case  9:  return JvNewShortArray (size);
 608       case 10:  return JvNewIntArray (size);
 609       case 11:  return JvNewLongArray (size);
 610     }
 611   throw new java::lang::InternalError
 612     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 613 }
 614
 615 // Allocate a possibly multi-dimensional array but don't check that
 616 // any array length is <0.
 617 static jobject
 618 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 619 {
 620   JvAssert (type->isArray());
 621   jclass element_type = type->getComponentType();
 622   jobject result;
 623   if (element_type->isPrimitive())
 624     result = _Jv_NewPrimArray (element_type, sizes[0]);
 625   else
 626     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 627
 628   if (dimensions > 1)
 629     {
 630       JvAssert (! element_type->isPrimitive());
 631       JvAssert (element_type->isArray());
 632       jobject *contents = elements ((jobjectArray) result);
 633       for (int i = 0; i < sizes[0]; ++i)
 634         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 635                                                   sizes + 1);
 636     }
 637
 638   return result;
 639 }
 640
 641 jobject
 642 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 643 {
 644   for (int i = 0; i < dimensions; ++i)
 645     if (sizes[i] < 0)
 646       throw new java::lang::NegativeArraySizeException;
 647
 648   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 649 }
 650
 651 jobject
 652 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 653 {
 654   va_list args;
 655   jint sizes[dimensions];
 656   va_start (args, dimensions);
 657   for (int i = 0; i < dimensions; ++i)
 658     {
 659       jint size = va_arg (args, jint);
 660       if (size < 0)
 661         throw new java::lang::NegativeArraySizeException;
 662       sizes[i] = size;
 663     }
 664   va_end (args);
 665
 666   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 667 }
 668
 669 \f
 670
 671 // Ensure 8-byte alignment, for hash synchronization.
 672 #define DECLARE_PRIM_TYPE(NAME)                 \
 673   _Jv_ArrayVTable _Jv_##NAME##VTable;           \
 674   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 675
 676 DECLARE_PRIM_TYPE(byte)
 677 DECLARE_PRIM_TYPE(short)
 678 DECLARE_PRIM_TYPE(int)
 679 DECLARE_PRIM_TYPE(long)
 680 DECLARE_PRIM_TYPE(boolean)
 681 DECLARE_PRIM_TYPE(char)
 682 DECLARE_PRIM_TYPE(float)
 683 DECLARE_PRIM_TYPE(double)
 684 DECLARE_PRIM_TYPE(void)
 685
 686 void
 687 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len,
 688                    _Jv_ArrayVTable *array_vtable)
 689 {
 690   using namespace java::lang::reflect;
 691
 692   // We must set the vtable for the class; the Java constructor
 693   // doesn't do this.
 694   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 695
 696   // Initialize the fields we care about.  We do this in the same
 697   // order they are declared in Class.h.
 698   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 699   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 700   cl->method_count = sig;
 701   cl->size_in_bytes = len;
 702   cl->vtable = JV_PRIMITIVE_VTABLE;
 703   cl->state = JV_STATE_DONE;
 704   cl->depth = -1;
 705   if (sig != 'V')
 706     _Jv_NewArrayClass (cl, NULL, (_Jv_VTable *) array_vtable);
 707 }
 708
 709 jclass
 710 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 711 {
 712   switch (*sig)
 713     {
 714     case 'B':
 715       return JvPrimClass (byte);
 716     case 'S':
 717       return JvPrimClass (short);
 718     case 'I':
 719       return JvPrimClass (int);
 720     case 'J':
 721       return JvPrimClass (long);
 722     case 'Z':
 723       return JvPrimClass (boolean);
 724     case 'C':
 725       return JvPrimClass (char);
 726     case 'F':
 727       return JvPrimClass (float);
 728     case 'D':
 729       return JvPrimClass (double);
 730     case 'V':
 731       return JvPrimClass (void);
 732     case 'L':
 733       {
 734         int i;
 735         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 736           ;
 737         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 738         return _Jv_FindClass (name, loader);
 739       }
 740     case '[':
 741       {
 742         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 743         if (! klass)
 744           return NULL;
 745         return _Jv_GetArrayClass (klass, loader);
 746       }
 747     }
 748
 749   return NULL;                  // Placate compiler.
 750 }
 751
 752 \f
 753
 754 JArray<jstring> *
 755 JvConvertArgv (int argc, const char **argv)
 756 {
 757   if (argc < 0)
 758     argc = 0;
 759   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 760   jobject *ptr = elements(ar);
 761   jbyteArray bytes = NULL;
 762   for (int i = 0;  i < argc;  i++)
 763     {
 764       const char *arg = argv[i];
 765       int len = strlen (arg);
 766       if (bytes == NULL || bytes->length < len)
 767         bytes = JvNewByteArray (len);
 768       jbyte *bytePtr = elements (bytes);
 769       // We assume jbyte == char.
 770       memcpy (bytePtr, arg, len);
 771
 772       // Now convert using the default encoding.
 773       *ptr++ = new java::lang::String (bytes, 0, len);
 774     }
 775   return (JArray<jstring>*) ar;
 776 }
 777
 778 // FIXME: These variables are static so that they will be
 779 // automatically scanned by the Boehm collector.  This is needed
 780 // because with qthreads the collector won't scan the initial stack --
 781 // it will only scan the qthreads stacks.
 782
 783 // Command line arguments.
 784 static JArray<jstring> *arg_vec;
 785
 786 // The primary thread.
 787 static java::lang::Thread *main_thread;
 788
 789 #ifndef DISABLE_GETENV_PROPERTIES
 790
 791 static char *
 792 next_property_key (char *s, size_t *length)
 793 {
 794   size_t l = 0;
 795
 796   JvAssert (s);
 797
 798   // Skip over whitespace
 799   while (isspace (*s))
 800     s++;
 801
 802   // If we've reached the end, return NULL.  Also return NULL if for
 803   // some reason we've come across a malformed property string.
 804   if (*s == 0
 805       || *s == ':'
 806       || *s == '=')
 807     return NULL;
 808
 809   // Determine the length of the property key.
 810   while (s[l] != 0
 811          && ! isspace (s[l])
 812          && s[l] != ':'
 813          && s[l] != '=')
 814     {
 815       if (s[l] == '\\'
 816           && s[l+1] != 0)
 817         l++;
 818       l++;
 819     }
 820
 821   *length = l;
 822
 823   return s;
 824 }
 825
 826 static char *
 827 next_property_value (char *s, size_t *length)
 828 {
 829   size_t l = 0;
 830
 831   JvAssert (s);
 832
 833   while (isspace (*s))
 834     s++;
 835
 836   if (*s == ':'
 837       || *s == '=')
 838     s++;
 839
 840   while (isspace (*s))
 841     s++;
 842
 843   // If we've reached the end, return NULL.
 844   if (*s == 0)
 845     return NULL;
 846
 847   // Determine the length of the property value.
 848   while (s[l] != 0
 849          && ! isspace (s[l])
 850          && s[l] != ':'
 851          && s[l] != '=')
 852     {
 853       if (s[l] == '\\'
 854           && s[l+1] != 0)
 855         l += 2;
 856       else
 857         l++;
 858     }
 859
 860   *length = l;
 861
 862   return s;
 863 }
 864
 865 static void
 866 process_gcj_properties ()
 867 {
 868   char *props = getenv("GCJ_PROPERTIES");
 869   char *p = props;
 870   size_t length;
 871   size_t property_count = 0;
 872
 873   if (NULL == props)
 874     return;
 875
 876   // Whip through props quickly in order to count the number of
 877   // property values.
 878   while (p && (p = next_property_key (p, &length)))
 879     {
 880       // Skip to the end of the key
 881       p += length;
 882
 883       p = next_property_value (p, &length);
 884       if (p)
 885         p += length;
 886
 887       property_count++;
 888     }
 889
 890   // Allocate an array of property value/key pairs.
 891   _Jv_Environment_Properties =
 892     (property_pair *) malloc (sizeof(property_pair)
 893                               * (property_count + 1));
 894
 895   // Go through the properties again, initializing _Jv_Properties
 896   // along the way.
 897   p = props;
 898   property_count = 0;
 899   while (p && (p = next_property_key (p, &length)))
 900     {
 901       _Jv_Environment_Properties[property_count].key = p;
 902       _Jv_Environment_Properties[property_count].key_length = length;
 903
 904       // Skip to the end of the key
 905       p += length;
 906
 907       p = next_property_value (p, &length);
 908
 909       _Jv_Environment_Properties[property_count].value = p;
 910       _Jv_Environment_Properties[property_count].value_length = length;
 911
 912       if (p)
 913         p += length;
 914
 915       property_count++;
 916     }
 917   memset ((void *) &_Jv_Environment_Properties[property_count],
 918           0, sizeof (property_pair));
 919   {
 920     size_t i = 0;
 921
 922     // Null terminate the strings.
 923     while (_Jv_Environment_Properties[i].key)
 924       {
 925         property_pair *prop = &_Jv_Environment_Properties[i];
 926         prop->key[prop->key_length] = 0;
 927         prop->value[prop->value_length] = 0;
 928         i++;
 929       }
 930   }
 931 }
 932 #endif // DISABLE_GETENV_PROPERTIES
 933
 934 namespace gcj
 935 {
 936   _Jv_Utf8Const *void_signature;
 937   _Jv_Utf8Const *clinit_name;
 938   _Jv_Utf8Const *init_name;
 939   _Jv_Utf8Const *finit_name;
 940
 941   bool runtimeInitialized = false;
 942 }
 943
 944 jint
 945 _Jv_CreateJavaVM (void* /*vm_args*/)
 946 {
 947   using namespace gcj;
 948
 949   if (runtimeInitialized)
 950     return -1;
 951
 952   runtimeInitialized = true;
 953
 954   PROCESS_GCJ_PROPERTIES;
 955
 956   _Jv_InitThreads ();
 957   _Jv_InitGC ();
 958   _Jv_InitializeSyncMutex ();
 959
 960 #ifdef INTERPRETER
 961   _Jv_InitInterpreter ();
 962 #endif
 963
 964 #ifdef HANDLE_SEGV
 965   INIT_SEGV;
 966 #endif
 967
 968 #ifdef HANDLE_FPE
 969   INIT_FPE;
 970 #endif
 971
 972   /* Initialize Utf8 constants declared in jvm.h. */
 973   void_signature = _Jv_makeUtf8Const ("()V", 3);
 974   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 975   init_name = _Jv_makeUtf8Const ("<init>", 6);
 976   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 977
 978   /* Initialize built-in classes to represent primitive TYPEs. */
 979   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1, &_Jv_byteVTable);
 980   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2, &_Jv_shortVTable);
 981   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4, &_Jv_intVTable);
 982   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8, &_Jv_longVTable);
 983   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1, &_Jv_booleanVTable);
 984   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2, &_Jv_charVTable);
 985   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4, &_Jv_floatVTable);
 986   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8, &_Jv_doubleVTable);
 987   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0, &_Jv_voidVTable);
 988
 989   // Turn stack trace generation off while creating exception objects.
 990   _Jv_InitClass (&java::lang::VMThrowable::class$);
 991   java::lang::VMThrowable::trace_enabled = 0;
 992
 993   // We have to initialize this fairly early, to avoid circular class
 994   // initialization.  In particular we want to start the
 995   // initialization of ClassLoader before we start the initialization
 996   // of VMClassLoader.
 997   _Jv_InitClass (&java::lang::ClassLoader::class$);
 998
 999   // Once the bootstrap loader is in place, change it into a kind of
1000   // system loader, by having it read the class path.
1001   gnu::gcj::runtime::VMClassLoader::initialize();
1002
1003   no_memory = new java::lang::OutOfMemoryError;
1004
1005   java::lang::VMThrowable::trace_enabled = 1;
1006
1007 #ifdef USE_LTDL
1008   LTDL_SET_PRELOADED_SYMBOLS ();
1009 #endif
1010
1011   _Jv_platform_initialize ();
1012
1013   _Jv_JNI_Init ();
1014
1015   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
1016
1017   // Start the GC finalizer thread.  A VirtualMachineError can be
1018   // thrown by the runtime if, say, threads aren't available.
1019   try
1020     {
1021       using namespace gnu::gcj::runtime;
1022       FinalizerThread *ft = new FinalizerThread ();
1023       ft->start ();
1024     }
1025   catch (java::lang::VirtualMachineError *ignore)
1026     {
1027     }
1028
1029   return 0;
1030 }
1031
1032 void
1033 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
1034              bool is_jar)
1035 {
1036   _Jv_SetArgs (argc, argv);
1037
1038   java::lang::Runtime *runtime = NULL;
1039
1040   try
1041     {
1042       // Set this very early so that it is seen when java.lang.System
1043       // is initialized.
1044       if (is_jar)
1045         _Jv_Jar_Class_Path = strdup (name);
1046       _Jv_CreateJavaVM (NULL);
1047
1048       // Get the Runtime here.  We want to initialize it before searching
1049       // for `main'; that way it will be set up if `main' is a JNI method.
1050       runtime = java::lang::Runtime::getRuntime ();
1051
1052 #ifdef DISABLE_MAIN_ARGS
1053       arg_vec = JvConvertArgv (0, 0);
1054 #else
1055       arg_vec = JvConvertArgv (argc - 1, argv + 1);
1056 #endif
1057
1058       using namespace gnu::java::lang;
1059       if (klass)
1060         main_thread = new MainThread (klass, arg_vec);
1061       else
1062         main_thread = new MainThread (JvNewStringLatin1 (name),
1063                                       arg_vec, is_jar);
1064     }
1065   catch (java::lang::Throwable *t)
1066     {
1067       java::lang::System::err->println (JvNewStringLatin1
1068         ("Exception during runtime initialization"));
1069       t->printStackTrace();
1070       runtime->exit (1);
1071     }
1072
1073   _Jv_AttachCurrentThread (main_thread);
1074   _Jv_ThreadRun (main_thread);
1075   _Jv_ThreadWait ();
1076
1077   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1078   runtime->exit (status);
1079 }
1080
1081 void
1082 JvRunMain (jclass klass, int argc, const char **argv)
1083 {
1084   _Jv_RunMain (klass, NULL, argc, argv, false);
1085 }
1086
1087 \f
1088
1089 // Parse a string and return a heap size.
1090 static size_t
1091 parse_heap_size (const char *spec)
1092 {
1093   char *end;
1094   unsigned long val = strtoul (spec, &end, 10);
1095   if (*end == 'k' || *end == 'K')
1096     val *= 1024;
1097   else if (*end == 'm' || *end == 'M')
1098     val *= 1048576;
1099   return (size_t) val;
1100 }
1101
1102 // Set the initial heap size.  This might be ignored by the GC layer.
1103 // This must be called before _Jv_RunMain.
1104 void
1105 _Jv_SetInitialHeapSize (const char *arg)
1106 {
1107   size_t size = parse_heap_size (arg);
1108   _Jv_GCSetInitialHeapSize (size);
1109 }
1110
1111 // Set the maximum heap size.  This might be ignored by the GC layer.
1112 // This must be called before _Jv_RunMain.
1113 void
1114 _Jv_SetMaximumHeapSize (const char *arg)
1115 {
1116   size_t size = parse_heap_size (arg);
1117   _Jv_GCSetMaximumHeapSize (size);
1118 }
1119
1120 \f
1121
1122 void *
1123 _Jv_Malloc (jsize size)
1124 {
1125   if (__builtin_expect (size == 0, false))
1126     size = 1;
1127   void *ptr = malloc ((size_t) size);
1128   if (__builtin_expect (ptr == NULL, false))
1129     throw no_memory;
1130   return ptr;
1131 }
1132
1133 void *
1134 _Jv_Realloc (void *ptr, jsize size)
1135 {
1136   if (__builtin_expect (size == 0, false))
1137     size = 1;
1138   ptr = realloc (ptr, (size_t) size);
1139   if (__builtin_expect (ptr == NULL, false))
1140     throw no_memory;
1141   return ptr;
1142 }
1143
1144 void *
1145 _Jv_MallocUnchecked (jsize size)
1146 {
1147   if (__builtin_expect (size == 0, false))
1148     size = 1;
1149   return malloc ((size_t) size);
1150 }
1151
1152 void
1153 _Jv_Free (void* ptr)
1154 {
1155   return free (ptr);
1156 }
1157
1158 \f
1159
1160 // In theory, these routines can be #ifdef'd away on machines which
1161 // support divide overflow signals.  However, we never know if some
1162 // code might have been compiled with "-fuse-divide-subroutine", so we
1163 // always include them in libgcj.
1164
1165 jint
1166 _Jv_divI (jint dividend, jint divisor)
1167 {
1168   if (__builtin_expect (divisor == 0, false))
1169     {
1170       java::lang::ArithmeticException *arithexception
1171         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1172       throw arithexception;
1173     }
1174
1175   if (dividend == (jint) 0x80000000L && divisor == -1)
1176     return dividend;
1177
1178   return dividend / divisor;
1179 }
1180
1181 jint
1182 _Jv_remI (jint dividend, jint divisor)
1183 {
1184   if (__builtin_expect (divisor == 0, false))
1185     {
1186       java::lang::ArithmeticException *arithexception
1187         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1188       throw arithexception;
1189     }
1190
1191   if (dividend == (jint) 0x80000000L && divisor == -1)
1192     return 0;
1193
1194   return dividend % divisor;
1195 }
1196
1197 jlong
1198 _Jv_divJ (jlong dividend, jlong divisor)
1199 {
1200   if (__builtin_expect (divisor == 0, false))
1201     {
1202       java::lang::ArithmeticException *arithexception
1203         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1204       throw arithexception;
1205     }
1206
1207   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1208     return dividend;
1209
1210   return dividend / divisor;
1211 }
1212
1213 jlong
1214 _Jv_remJ (jlong dividend, jlong divisor)
1215 {
1216   if (__builtin_expect (divisor == 0, false))
1217     {
1218       java::lang::ArithmeticException *arithexception
1219         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1220       throw arithexception;
1221     }
1222
1223   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1224     return 0;
1225
1226   return dividend % divisor;
1227 }
1228
1229 \f
1230
1231 // Return true if SELF_KLASS can access a field or method in
1232 // OTHER_KLASS.  The field or method's access flags are specified in
1233 // FLAGS.
1234 jboolean
1235 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1236 {
1237   using namespace java::lang::reflect;
1238   return ((self_klass == other_klass)
1239           || ((flags & Modifier::PUBLIC) != 0)
1240           || (((flags & Modifier::PROTECTED) != 0)
1241               && other_klass->isAssignableFrom (self_klass))
1242           || (((flags & Modifier::PRIVATE) == 0)
1243               && _Jv_ClassNameSamePackage (self_klass->name,
1244                                            other_klass->name)));
1245 }