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   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 674
 675 DECLARE_PRIM_TYPE(byte)
 676 DECLARE_PRIM_TYPE(short)
 677 DECLARE_PRIM_TYPE(int)
 678 DECLARE_PRIM_TYPE(long)
 679 DECLARE_PRIM_TYPE(boolean)
 680 DECLARE_PRIM_TYPE(char)
 681 DECLARE_PRIM_TYPE(float)
 682 DECLARE_PRIM_TYPE(double)
 683 DECLARE_PRIM_TYPE(void)
 684
 685 void
 686 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len)
 687 {
 688   using namespace java::lang::reflect;
 689
 690   // We must set the vtable for the class; the Java constructor
 691   // doesn't do this.
 692   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 693
 694   // Initialize the fields we care about.  We do this in the same
 695   // order they are declared in Class.h.
 696   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 697   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 698   cl->method_count = sig;
 699   cl->size_in_bytes = len;
 700   cl->vtable = JV_PRIMITIVE_VTABLE;
 701   cl->state = JV_STATE_DONE;
 702   cl->depth = -1;
 703 }
 704
 705 jclass
 706 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 707 {
 708   switch (*sig)
 709     {
 710     case 'B':
 711       return JvPrimClass (byte);
 712     case 'S':
 713       return JvPrimClass (short);
 714     case 'I':
 715       return JvPrimClass (int);
 716     case 'J':
 717       return JvPrimClass (long);
 718     case 'Z':
 719       return JvPrimClass (boolean);
 720     case 'C':
 721       return JvPrimClass (char);
 722     case 'F':
 723       return JvPrimClass (float);
 724     case 'D':
 725       return JvPrimClass (double);
 726     case 'V':
 727       return JvPrimClass (void);
 728     case 'L':
 729       {
 730         int i;
 731         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 732           ;
 733         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 734         return _Jv_FindClass (name, loader);
 735       }
 736     case '[':
 737       {
 738         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 739         if (! klass)
 740           return NULL;
 741         return _Jv_GetArrayClass (klass, loader);
 742       }
 743     }
 744
 745   return NULL;                  // Placate compiler.
 746 }
 747
 748 \f
 749
 750 JArray<jstring> *
 751 JvConvertArgv (int argc, const char **argv)
 752 {
 753   if (argc < 0)
 754     argc = 0;
 755   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 756   jobject *ptr = elements(ar);
 757   jbyteArray bytes = NULL;
 758   for (int i = 0;  i < argc;  i++)
 759     {
 760       const char *arg = argv[i];
 761       int len = strlen (arg);
 762       if (bytes == NULL || bytes->length < len)
 763         bytes = JvNewByteArray (len);
 764       jbyte *bytePtr = elements (bytes);
 765       // We assume jbyte == char.
 766       memcpy (bytePtr, arg, len);
 767
 768       // Now convert using the default encoding.
 769       *ptr++ = new java::lang::String (bytes, 0, len);
 770     }
 771   return (JArray<jstring>*) ar;
 772 }
 773
 774 // FIXME: These variables are static so that they will be
 775 // automatically scanned by the Boehm collector.  This is needed
 776 // because with qthreads the collector won't scan the initial stack --
 777 // it will only scan the qthreads stacks.
 778
 779 // Command line arguments.
 780 static JArray<jstring> *arg_vec;
 781
 782 // The primary thread.
 783 static java::lang::Thread *main_thread;
 784
 785 #ifndef DISABLE_GETENV_PROPERTIES
 786
 787 static char *
 788 next_property_key (char *s, size_t *length)
 789 {
 790   size_t l = 0;
 791
 792   JvAssert (s);
 793
 794   // Skip over whitespace
 795   while (isspace (*s))
 796     s++;
 797
 798   // If we've reached the end, return NULL.  Also return NULL if for
 799   // some reason we've come across a malformed property string.
 800   if (*s == 0
 801       || *s == ':'
 802       || *s == '=')
 803     return NULL;
 804
 805   // Determine the length of the property key.
 806   while (s[l] != 0
 807          && ! isspace (s[l])
 808          && s[l] != ':'
 809          && s[l] != '=')
 810     {
 811       if (s[l] == '\\'
 812           && s[l+1] != 0)
 813         l++;
 814       l++;
 815     }
 816
 817   *length = l;
 818
 819   return s;
 820 }
 821
 822 static char *
 823 next_property_value (char *s, size_t *length)
 824 {
 825   size_t l = 0;
 826
 827   JvAssert (s);
 828
 829   while (isspace (*s))
 830     s++;
 831
 832   if (*s == ':'
 833       || *s == '=')
 834     s++;
 835
 836   while (isspace (*s))
 837     s++;
 838
 839   // If we've reached the end, return NULL.
 840   if (*s == 0)
 841     return NULL;
 842
 843   // Determine the length of the property value.
 844   while (s[l] != 0
 845          && ! isspace (s[l])
 846          && s[l] != ':'
 847          && s[l] != '=')
 848     {
 849       if (s[l] == '\\'
 850           && s[l+1] != 0)
 851         l += 2;
 852       else
 853         l++;
 854     }
 855
 856   *length = l;
 857
 858   return s;
 859 }
 860
 861 static void
 862 process_gcj_properties ()
 863 {
 864   char *props = getenv("GCJ_PROPERTIES");
 865   char *p = props;
 866   size_t length;
 867   size_t property_count = 0;
 868
 869   if (NULL == props)
 870     return;
 871
 872   // Whip through props quickly in order to count the number of
 873   // property values.
 874   while (p && (p = next_property_key (p, &length)))
 875     {
 876       // Skip to the end of the key
 877       p += length;
 878
 879       p = next_property_value (p, &length);
 880       if (p)
 881         p += length;
 882
 883       property_count++;
 884     }
 885
 886   // Allocate an array of property value/key pairs.
 887   _Jv_Environment_Properties =
 888     (property_pair *) malloc (sizeof(property_pair)
 889                               * (property_count + 1));
 890
 891   // Go through the properties again, initializing _Jv_Properties
 892   // along the way.
 893   p = props;
 894   property_count = 0;
 895   while (p && (p = next_property_key (p, &length)))
 896     {
 897       _Jv_Environment_Properties[property_count].key = p;
 898       _Jv_Environment_Properties[property_count].key_length = length;
 899
 900       // Skip to the end of the key
 901       p += length;
 902
 903       p = next_property_value (p, &length);
 904
 905       _Jv_Environment_Properties[property_count].value = p;
 906       _Jv_Environment_Properties[property_count].value_length = length;
 907
 908       if (p)
 909         p += length;
 910
 911       property_count++;
 912     }
 913   memset ((void *) &_Jv_Environment_Properties[property_count],
 914           0, sizeof (property_pair));
 915   {
 916     size_t i = 0;
 917
 918     // Null terminate the strings.
 919     while (_Jv_Environment_Properties[i].key)
 920       {
 921         property_pair *prop = &_Jv_Environment_Properties[i];
 922         prop->key[prop->key_length] = 0;
 923         prop->value[prop->value_length] = 0;
 924         i++;
 925       }
 926   }
 927 }
 928 #endif // DISABLE_GETENV_PROPERTIES
 929
 930 namespace gcj
 931 {
 932   _Jv_Utf8Const *void_signature;
 933   _Jv_Utf8Const *clinit_name;
 934   _Jv_Utf8Const *init_name;
 935   _Jv_Utf8Const *finit_name;
 936
 937   bool runtimeInitialized = false;
 938 }
 939
 940 jint
 941 _Jv_CreateJavaVM (void* /*vm_args*/)
 942 {
 943   using namespace gcj;
 944
 945   if (runtimeInitialized)
 946     return -1;
 947
 948   runtimeInitialized = true;
 949
 950   PROCESS_GCJ_PROPERTIES;
 951
 952   _Jv_InitThreads ();
 953   _Jv_InitGC ();
 954   _Jv_InitializeSyncMutex ();
 955
 956 #ifdef INTERPRETER
 957   _Jv_InitInterpreter ();
 958 #endif
 959
 960 #ifdef HANDLE_SEGV
 961   INIT_SEGV;
 962 #endif
 963
 964 #ifdef HANDLE_FPE
 965   INIT_FPE;
 966 #endif
 967
 968   /* Initialize Utf8 constants declared in jvm.h. */
 969   void_signature = _Jv_makeUtf8Const ("()V", 3);
 970   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 971   init_name = _Jv_makeUtf8Const ("<init>", 6);
 972   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 973
 974   /* Initialize built-in classes to represent primitive TYPEs. */
 975   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1);
 976   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2);
 977   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4);
 978   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8);
 979   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1);
 980   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2);
 981   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4);
 982   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8);
 983   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0);
 984
 985   // Turn stack trace generation off while creating exception objects.
 986   _Jv_InitClass (&java::lang::VMThrowable::class$);
 987   java::lang::VMThrowable::trace_enabled = 0;
 988
 989   // We have to initialize this fairly early, to avoid circular class
 990   // initialization.  In particular we want to start the
 991   // initialization of ClassLoader before we start the initialization
 992   // of VMClassLoader.
 993   _Jv_InitClass (&java::lang::ClassLoader::class$);
 994
 995   // Once the bootstrap loader is in place, change it into a kind of
 996   // system loader, by having it read the class path.
 997   gnu::gcj::runtime::VMClassLoader::initialize();
 998
 999   no_memory = new java::lang::OutOfMemoryError;
1000
1001   java::lang::VMThrowable::trace_enabled = 1;
1002
1003 #ifdef USE_LTDL
1004   LTDL_SET_PRELOADED_SYMBOLS ();
1005 #endif
1006
1007   _Jv_platform_initialize ();
1008
1009   _Jv_JNI_Init ();
1010
1011   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
1012
1013   // Start the GC finalizer thread.  A VirtualMachineError can be
1014   // thrown by the runtime if, say, threads aren't available.
1015   try
1016     {
1017       using namespace gnu::gcj::runtime;
1018       FinalizerThread *ft = new FinalizerThread ();
1019       ft->start ();
1020     }
1021   catch (java::lang::VirtualMachineError *ignore)
1022     {
1023     }
1024
1025   return 0;
1026 }
1027
1028 void
1029 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
1030              bool is_jar)
1031 {
1032 #ifndef DISABLE_MAIN_ARGS
1033   _Jv_SetArgs (argc, argv);
1034 #endif
1035
1036   java::lang::Runtime *runtime = NULL;
1037
1038   try
1039     {
1040       // Set this very early so that it is seen when java.lang.System
1041       // is initialized.
1042       if (is_jar)
1043         _Jv_Jar_Class_Path = strdup (name);
1044       _Jv_CreateJavaVM (NULL);
1045
1046       // Get the Runtime here.  We want to initialize it before searching
1047       // for `main'; that way it will be set up if `main' is a JNI method.
1048       runtime = java::lang::Runtime::getRuntime ();
1049
1050 #ifdef DISABLE_MAIN_ARGS
1051       arg_vec = JvConvertArgv (0, 0);
1052 #else
1053       arg_vec = JvConvertArgv (argc - 1, argv + 1);
1054 #endif
1055
1056       using namespace gnu::java::lang;
1057       if (klass)
1058         main_thread = new MainThread (klass, arg_vec);
1059       else
1060         main_thread = new MainThread (JvNewStringLatin1 (name),
1061                                       arg_vec, is_jar);
1062     }
1063   catch (java::lang::Throwable *t)
1064     {
1065       java::lang::System::err->println (JvNewStringLatin1
1066         ("Exception during runtime initialization"));
1067       t->printStackTrace();
1068       runtime->exit (1);
1069     }
1070
1071   _Jv_AttachCurrentThread (main_thread);
1072   _Jv_ThreadRun (main_thread);
1073   _Jv_ThreadWait ();
1074
1075   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1076   runtime->exit (status);
1077 }
1078
1079 void
1080 JvRunMain (jclass klass, int argc, const char **argv)
1081 {
1082   _Jv_RunMain (klass, NULL, argc, argv, false);
1083 }
1084
1085 \f
1086
1087 // Parse a string and return a heap size.
1088 static size_t
1089 parse_heap_size (const char *spec)
1090 {
1091   char *end;
1092   unsigned long val = strtoul (spec, &end, 10);
1093   if (*end == 'k' || *end == 'K')
1094     val *= 1024;
1095   else if (*end == 'm' || *end == 'M')
1096     val *= 1048576;
1097   return (size_t) val;
1098 }
1099
1100 // Set the initial heap size.  This might be ignored by the GC layer.
1101 // This must be called before _Jv_RunMain.
1102 void
1103 _Jv_SetInitialHeapSize (const char *arg)
1104 {
1105   size_t size = parse_heap_size (arg);
1106   _Jv_GCSetInitialHeapSize (size);
1107 }
1108
1109 // Set the maximum heap size.  This might be ignored by the GC layer.
1110 // This must be called before _Jv_RunMain.
1111 void
1112 _Jv_SetMaximumHeapSize (const char *arg)
1113 {
1114   size_t size = parse_heap_size (arg);
1115   _Jv_GCSetMaximumHeapSize (size);
1116 }
1117
1118 \f
1119
1120 void *
1121 _Jv_Malloc (jsize size)
1122 {
1123   if (__builtin_expect (size == 0, false))
1124     size = 1;
1125   void *ptr = malloc ((size_t) size);
1126   if (__builtin_expect (ptr == NULL, false))
1127     throw no_memory;
1128   return ptr;
1129 }
1130
1131 void *
1132 _Jv_Realloc (void *ptr, jsize size)
1133 {
1134   if (__builtin_expect (size == 0, false))
1135     size = 1;
1136   ptr = realloc (ptr, (size_t) size);
1137   if (__builtin_expect (ptr == NULL, false))
1138     throw no_memory;
1139   return ptr;
1140 }
1141
1142 void *
1143 _Jv_MallocUnchecked (jsize size)
1144 {
1145   if (__builtin_expect (size == 0, false))
1146     size = 1;
1147   return malloc ((size_t) size);
1148 }
1149
1150 void
1151 _Jv_Free (void* ptr)
1152 {
1153   return free (ptr);
1154 }
1155
1156 \f
1157
1158 // In theory, these routines can be #ifdef'd away on machines which
1159 // support divide overflow signals.  However, we never know if some
1160 // code might have been compiled with "-fuse-divide-subroutine", so we
1161 // always include them in libgcj.
1162
1163 jint
1164 _Jv_divI (jint dividend, jint 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 == (jint) 0x80000000L && divisor == -1)
1174     return dividend;
1175
1176   return dividend / divisor;
1177 }
1178
1179 jint
1180 _Jv_remI (jint dividend, jint 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 == (jint) 0x80000000L && divisor == -1)
1190     return 0;
1191
1192   return dividend % divisor;
1193 }
1194
1195 jlong
1196 _Jv_divJ (jlong dividend, jlong divisor)
1197 {
1198   if (__builtin_expect (divisor == 0, false))
1199     {
1200       java::lang::ArithmeticException *arithexception
1201         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1202       throw arithexception;
1203     }
1204
1205   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1206     return dividend;
1207
1208   return dividend / divisor;
1209 }
1210
1211 jlong
1212 _Jv_remJ (jlong dividend, jlong divisor)
1213 {
1214   if (__builtin_expect (divisor == 0, false))
1215     {
1216       java::lang::ArithmeticException *arithexception
1217         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1218       throw arithexception;
1219     }
1220
1221   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1222     return 0;
1223
1224   return dividend % divisor;
1225 }
1226
1227 \f
1228
1229 // Return true if SELF_KLASS can access a field or method in
1230 // OTHER_KLASS.  The field or method's access flags are specified in
1231 // FLAGS.
1232 jboolean
1233 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1234 {
1235   using namespace java::lang::reflect;
1236   return ((self_klass == other_klass)
1237           || ((flags & Modifier::PUBLIC) != 0)
1238           || (((flags & Modifier::PROTECTED) != 0)
1239               && other_klass->isAssignableFrom (self_klass))
1240           || (((flags & Modifier::PRIVATE) == 0)
1241               && _Jv_ClassNameSamePackage (self_klass->name,
1242                                            other_klass->name)));
1243 }