libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <config.h>
  12 #include <platform.h>
  13
  14 #include <stdlib.h>
  15 #include <stdarg.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <signal.h>
  19
  20 #ifdef HAVE_UNISTD_H
  21 #include <unistd.h>
  22 #endif
  23
  24 #include <gcj/cni.h>
  25 #include <jvm.h>
  26 #include <java-signal.h>
  27 #include <java-threads.h>
  28
  29 #ifdef ENABLE_JVMPI
  30 #include <jvmpi.h>
  31 #include <java/lang/ThreadGroup.h>
  32 #endif
  33
  34 #ifndef DISABLE_GETENV_PROPERTIES
  35 #include <ctype.h>
  36 #include <java-props.h>
  37 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  38 #else
  39 #define PROCESS_GCJ_PROPERTIES
  40 #endif // DISABLE_GETENV_PROPERTIES
  41
  42 #include <java/lang/Class.h>
  43 #include <java/lang/ClassLoader.h>
  44 #include <java/lang/Runtime.h>
  45 #include <java/lang/String.h>
  46 #include <java/lang/Thread.h>
  47 #include <java/lang/ThreadGroup.h>
  48 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  49 #include <java/lang/ArithmeticException.h>
  50 #include <java/lang/ClassFormatError.h>
  51 #include <java/lang/InternalError.h>
  52 #include <java/lang/NegativeArraySizeException.h>
  53 #include <java/lang/NullPointerException.h>
  54 #include <java/lang/OutOfMemoryError.h>
  55 #include <java/lang/System.h>
  56 #include <java/lang/VMThrowable.h>
  57 #include <java/lang/reflect/Modifier.h>
  58 #include <java/io/PrintStream.h>
  59 #include <java/lang/UnsatisfiedLinkError.h>
  60 #include <java/lang/VirtualMachineError.h>
  61 #include <gnu/gcj/runtime/VMClassLoader.h>
  62 #include <gnu/gcj/runtime/FinalizerThread.h>
  63 #include <gnu/gcj/runtime/FirstThread.h>
  64
  65 #ifdef USE_LTDL
  66 #include <ltdl.h>
  67 #endif
  68
  69 // We allocate a single OutOfMemoryError exception which we keep
  70 // around for use if we run out of memory.
  71 static java::lang::OutOfMemoryError *no_memory;
  72
  73 // Number of bytes in largest array object we create.  This could be
  74 // increased to the largest size_t value, so long as the appropriate
  75 // functions are changed to take a size_t argument instead of jint.
  76 #define MAX_OBJECT_SIZE ((1<<31) - 1)
  77
  78 static const char *no_properties[] = { NULL };
  79
  80 // Properties set at compile time.
  81 const char **_Jv_Compiler_Properties = no_properties;
  82
  83 // The JAR file to add to the beginning of java.class.path.
  84 const char *_Jv_Jar_Class_Path;
  85
  86 #ifndef DISABLE_GETENV_PROPERTIES
  87 // Property key/value pairs.
  88 property_pair *_Jv_Environment_Properties;
  89 #endif
  90
  91 // Stash the argv pointer to benefit native libraries that need it.
  92 const char **_Jv_argv;
  93 int _Jv_argc;
  94
  95 // Argument support.
  96 int
  97 _Jv_GetNbArgs (void)
  98 {
  99   // _Jv_argc is 0 if not explicitly initialized.
 100   return _Jv_argc;
 101 }
 102
 103 const char *
 104 _Jv_GetSafeArg (int index)
 105 {
 106   if (index >=0 && index < _Jv_GetNbArgs ())
 107     return _Jv_argv[index];
 108   else
 109     return "";
 110 }
 111
 112 void
 113 _Jv_SetArgs (int argc, const char **argv)
 114 {
 115   _Jv_argc = argc;
 116   _Jv_argv = argv;
 117 }
 118
 119 #ifdef ENABLE_JVMPI
 120 // Pointer to JVMPI notification functions.
 121 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 122 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 123 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 124 #endif
 125 \f
 126
 127 /* Unblock a signal.  Unless we do this, the signal may only be sent
 128    once.  */
 129 static void
 130 unblock_signal (int signum)
 131 {
 132 #ifdef _POSIX_VERSION
 133   sigset_t sigs;
 134
 135   sigemptyset (&sigs);
 136   sigaddset (&sigs, signum);
 137   sigprocmask (SIG_UNBLOCK, &sigs, NULL);
 138 #endif
 139 }
 140
 141 #ifdef HANDLE_SEGV
 142 SIGNAL_HANDLER (catch_segv)
 143 {
 144   java::lang::NullPointerException *nullp
 145     = new java::lang::NullPointerException;
 146   unblock_signal (SIGSEGV);
 147   MAKE_THROW_FRAME (nullp);
 148   throw nullp;
 149 }
 150 #endif
 151
 152 #ifdef HANDLE_FPE
 153 SIGNAL_HANDLER (catch_fpe)
 154 {
 155   java::lang::ArithmeticException *arithexception
 156     = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
 157   unblock_signal (SIGFPE);
 158 #ifdef HANDLE_DIVIDE_OVERFLOW
 159   HANDLE_DIVIDE_OVERFLOW;
 160 #else
 161   MAKE_THROW_FRAME (arithexception);
 162 #endif
 163   throw arithexception;
 164 }
 165 #endif
 166
 167 \f
 168
 169 jboolean
 170 _Jv_equalUtf8Consts (const Utf8Const* a, const Utf8Const *b)
 171 {
 172   int len;
 173   const _Jv_ushort *aptr, *bptr;
 174   if (a == b)
 175     return true;
 176   if (a->hash != b->hash)
 177     return false;
 178   len = a->length;
 179   if (b->length != len)
 180     return false;
 181   aptr = (const _Jv_ushort *)a->data;
 182   bptr = (const _Jv_ushort *)b->data;
 183   len = (len + 1) >> 1;
 184   while (--len >= 0)
 185     if (*aptr++ != *bptr++)
 186       return false;
 187   return true;
 188 }
 189
 190 /* True iff A is equal to STR.
 191    HASH is STR->hashCode().
 192 */
 193
 194 jboolean
 195 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 196 {
 197   if (a->hash != (_Jv_ushort) hash)
 198     return false;
 199   jint len = str->length();
 200   jint i = 0;
 201   jchar *sptr = _Jv_GetStringChars (str);
 202   unsigned char* ptr = (unsigned char*) a->data;
 203   unsigned char* limit = ptr + a->length;
 204   for (;; i++, sptr++)
 205     {
 206       int ch = UTF8_GET (ptr, limit);
 207       if (i == len)
 208         return ch < 0;
 209       if (ch != *sptr)
 210         return false;
 211     }
 212   return true;
 213 }
 214
 215 /* Like _Jv_equal, but stop after N characters.  */
 216 jboolean
 217 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 218 {
 219   jint len = str->length();
 220   jint i = 0;
 221   jchar *sptr = _Jv_GetStringChars (str);
 222   unsigned char* ptr = (unsigned char*) a->data;
 223   unsigned char* limit = ptr + a->length;
 224   for (; n-- > 0; i++, sptr++)
 225     {
 226       int ch = UTF8_GET (ptr, limit);
 227       if (i == len)
 228         return ch < 0;
 229       if (ch != *sptr)
 230         return false;
 231     }
 232   return true;
 233 }
 234
 235 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 236 int
 237 _Jv_strLengthUtf8(char* str, int len)
 238 {
 239   unsigned char* ptr;
 240   unsigned char* limit;
 241   int str_length;
 242
 243   ptr = (unsigned char*) str;
 244   limit = ptr + len;
 245   str_length = 0;
 246   for (; ptr < limit; str_length++)
 247     {
 248       if (UTF8_GET (ptr, limit) < 0)
 249         return (-1);
 250     }
 251   return (str_length);
 252 }
 253
 254 /* Calculate a hash value for a string encoded in Utf8 format.
 255  * This returns the same hash value as specified or java.lang.String.hashCode.
 256  */
 257 static jint
 258 hashUtf8String (char* str, int len)
 259 {
 260   unsigned char* ptr = (unsigned char*) str;
 261   unsigned char* limit = ptr + len;
 262   jint hash = 0;
 263
 264   for (; ptr < limit;)
 265     {
 266       int ch = UTF8_GET (ptr, limit);
 267       /* Updated specification from
 268          http://www.javasoft.com/docs/books/jls/clarify.html. */
 269       hash = (31 * hash) + ch;
 270     }
 271   return hash;
 272 }
 273
 274 _Jv_Utf8Const *
 275 _Jv_makeUtf8Const (char* s, int len)
 276 {
 277   if (len < 0)
 278     len = strlen (s);
 279   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 280   memcpy (m->data, s, len);
 281   m->data[len] = 0;
 282   m->length = len;
 283   m->hash = hashUtf8String (s, len) & 0xFFFF;
 284   return (m);
 285 }
 286
 287 _Jv_Utf8Const *
 288 _Jv_makeUtf8Const (jstring string)
 289 {
 290   jint hash = string->hashCode ();
 291   jint len = _Jv_GetStringUTFLength (string);
 292
 293   Utf8Const* m = (Utf8Const*)
 294     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 295
 296   m->hash = hash;
 297   m->length = len;
 298
 299   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 300   m->data[len] = 0;
 301
 302   return m;
 303 }
 304
 305 \f
 306
 307 #ifdef DEBUG
 308 void
 309 _Jv_Abort (const char *function, const char *file, int line,
 310            const char *message)
 311 #else
 312 void
 313 _Jv_Abort (const char *, const char *, int, const char *message)
 314 #endif
 315 {
 316 #ifdef DEBUG
 317   fprintf (stderr,
 318            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 319            message, function, file, line);
 320 #else
 321   fprintf (stderr, "libgcj failure: %s\n", message);
 322 #endif
 323   abort ();
 324 }
 325
 326 static void
 327 fail_on_finalization (jobject)
 328 {
 329   JvFail ("object was finalized");
 330 }
 331
 332 void
 333 _Jv_GCWatch (jobject obj)
 334 {
 335   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 336 }
 337
 338 void
 339 _Jv_ThrowBadArrayIndex(jint bad_index)
 340 {
 341   throw new java::lang::ArrayIndexOutOfBoundsException
 342     (java::lang::String::valueOf (bad_index));
 343 }
 344
 345 void
 346 _Jv_ThrowNullPointerException ()
 347 {
 348   throw new java::lang::NullPointerException;
 349 }
 350
 351 // Explicitly throw a no memory exception.
 352 // The collector calls this when it encounters an out-of-memory condition.
 353 void _Jv_ThrowNoMemory()
 354 {
 355   throw no_memory;
 356 }
 357
 358 #ifdef ENABLE_JVMPI
 359 static void
 360 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 361 {
 362   // Service JVMPI allocation request.
 363   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 364     {
 365       JVMPI_Event event;
 366
 367       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 368       event.env_id = NULL;
 369       event.u.obj_alloc.arena_id = 0;
 370       event.u.obj_alloc.class_id = (jobjectID) klass;
 371       event.u.obj_alloc.is_array = 0;
 372       event.u.obj_alloc.size = size;
 373       event.u.obj_alloc.obj_id = (jobjectID) obj;
 374
 375       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 376       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 377       // More importantly, I don't see the need for disabling GC, since we
 378       // blatantly have a pointer to obj on our stack, ensuring that the
 379       // object can't be collected.  Even for a nonconservative collector,
 380       // it appears to me that this must be true, since we are about to
 381       // return obj. Isn't this whole approach way too intrusive for
 382       // a useful profiling interface?                  - HB
 383       _Jv_DisableGC ();
 384       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 385       _Jv_EnableGC ();
 386     }
 387 }
 388 #else /* !ENABLE_JVMPI */
 389 # define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 390 #endif
 391
 392 // Allocate a new object of class KLASS.  SIZE is the size of the object
 393 // to allocate.  You might think this is redundant, but it isn't; some
 394 // classes, such as String, aren't of fixed size.
 395 // First a version that assumes that we have no finalizer, and that
 396 // the class is already initialized.
 397 // If we know that JVMPI is disabled, this can be replaced by a direct call
 398 // to the allocator for the appropriate GC.
 399 jobject
 400 _Jv_AllocObjectNoInitNoFinalizer (jclass klass, jint size)
 401 {
 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, jint size)
 410 {
 411   _Jv_InitClass (klass);
 412   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 413   jvmpi_notify_alloc (klass, size, obj);
 414   return obj;
 415 }
 416
 417 // And now the general version that registers a finalizer if necessary.
 418 jobject
 419 _Jv_AllocObject (jclass klass, jint size)
 420 {
 421   jobject obj = _Jv_AllocObjectNoFinalizer (klass, size);
 422
 423   // We assume that the compiler only generates calls to this routine
 424   // if there really is an interesting finalizer.
 425   // Unfortunately, we still have to the dynamic test, since there may
 426   // be cni calls to this routine.
 427   // Note that on IA64 get_finalizer() returns the starting address of the
 428   // function, not a function pointer.  Thus this still works.
 429   if (klass->vtable->get_finalizer ()
 430       != java::lang::Object::class$.vtable->get_finalizer ())
 431     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 432   return obj;
 433 }
 434
 435 // A version of the above that assumes the object contains no pointers,
 436 // and requires no finalization.  This can't happen if we need pointers
 437 // to locks.
 438 #ifdef JV_HASH_SYNCHRONIZATION
 439 jobject
 440 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 441 {
 442   _Jv_InitClass (klass);
 443
 444   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 445
 446 #ifdef ENABLE_JVMPI
 447   // Service JVMPI request.
 448
 449   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 450     {
 451       JVMPI_Event event;
 452
 453       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 454       event.env_id = NULL;
 455       event.u.obj_alloc.arena_id = 0;
 456       event.u.obj_alloc.class_id = (jobjectID) klass;
 457       event.u.obj_alloc.is_array = 0;
 458       event.u.obj_alloc.size = size;
 459       event.u.obj_alloc.obj_id = (jobjectID) obj;
 460
 461       _Jv_DisableGC ();
 462       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 463       _Jv_EnableGC ();
 464     }
 465 #endif
 466
 467   return obj;
 468 }
 469 #endif /* JV_HASH_SYNCHRONIZATION */
 470
 471
 472 // Allocate a new array of Java objects.  Each object is of type
 473 // `elementClass'.  `init' is used to initialize each slot in the
 474 // array.
 475 jobjectArray
 476 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 477 {
 478   if (__builtin_expect (count < 0, false))
 479     throw new java::lang::NegativeArraySizeException;
 480
 481   JvAssert (! elementClass->isPrimitive ());
 482
 483   // Ensure that elements pointer is properly aligned.
 484   jobjectArray obj = NULL;
 485   size_t size = (size_t) elements (obj);
 486   // Check for overflow.
 487   if (__builtin_expect ((size_t) count >
 488                         (MAX_OBJECT_SIZE - 1 - size) / sizeof (jobject), false))
 489     throw no_memory;
 490
 491   size += count * sizeof (jobject);
 492
 493   jclass klass = _Jv_GetArrayClass (elementClass,
 494                                     elementClass->getClassLoaderInternal());
 495
 496   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 497   // Cast away const.
 498   jsize *lp = const_cast<jsize *> (&obj->length);
 499   *lp = count;
 500   // We know the allocator returns zeroed memory.  So don't bother
 501   // zeroing it again.
 502   if (init)
 503     {
 504       jobject *ptr = elements(obj);
 505       while (--count >= 0)
 506         *ptr++ = init;
 507     }
 508   return obj;
 509 }
 510
 511 // Allocate a new array of primitives.  ELTYPE is the type of the
 512 // element, COUNT is the size of the array.
 513 jobject
 514 _Jv_NewPrimArray (jclass eltype, jint count)
 515 {
 516   int elsize = eltype->size();
 517   if (__builtin_expect (count < 0, false))
 518     throw new java::lang::NegativeArraySizeException;
 519
 520   JvAssert (eltype->isPrimitive ());
 521   jobject dummy = NULL;
 522   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 523
 524   // Check for overflow.
 525   if (__builtin_expect ((size_t) count >
 526                         (MAX_OBJECT_SIZE - size) / elsize, false))
 527     throw no_memory;
 528
 529   jclass klass = _Jv_GetArrayClass (eltype, 0);
 530
 531 # ifdef JV_HASH_SYNCHRONIZATION
 532   // Since the vtable is always statically allocated,
 533   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 534   __JArray *arr =
 535     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 536   memset((char *)arr + size, 0, elsize * count);
 537 # else
 538   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 539   // Note that we assume we are given zeroed memory by the allocator.
 540 # endif
 541   // Cast away const.
 542   jsize *lp = const_cast<jsize *> (&arr->length);
 543   *lp = count;
 544
 545   return arr;
 546 }
 547
 548 jobject
 549 _Jv_NewArray (jint type, jint size)
 550 {
 551   switch (type)
 552     {
 553       case  4:  return JvNewBooleanArray (size);
 554       case  5:  return JvNewCharArray (size);
 555       case  6:  return JvNewFloatArray (size);
 556       case  7:  return JvNewDoubleArray (size);
 557       case  8:  return JvNewByteArray (size);
 558       case  9:  return JvNewShortArray (size);
 559       case 10:  return JvNewIntArray (size);
 560       case 11:  return JvNewLongArray (size);
 561     }
 562   throw new java::lang::InternalError
 563     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 564 }
 565
 566 // Allocate a possibly multi-dimensional array but don't check that
 567 // any array length is <0.
 568 static jobject
 569 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 570 {
 571   JvAssert (type->isArray());
 572   jclass element_type = type->getComponentType();
 573   jobject result;
 574   if (element_type->isPrimitive())
 575     result = _Jv_NewPrimArray (element_type, sizes[0]);
 576   else
 577     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 578
 579   if (dimensions > 1)
 580     {
 581       JvAssert (! element_type->isPrimitive());
 582       JvAssert (element_type->isArray());
 583       jobject *contents = elements ((jobjectArray) result);
 584       for (int i = 0; i < sizes[0]; ++i)
 585         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 586                                                   sizes + 1);
 587     }
 588
 589   return result;
 590 }
 591
 592 jobject
 593 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 594 {
 595   for (int i = 0; i < dimensions; ++i)
 596     if (sizes[i] < 0)
 597       throw new java::lang::NegativeArraySizeException;
 598
 599   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 600 }
 601
 602 jobject
 603 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 604 {
 605   va_list args;
 606   jint sizes[dimensions];
 607   va_start (args, dimensions);
 608   for (int i = 0; i < dimensions; ++i)
 609     {
 610       jint size = va_arg (args, jint);
 611       if (size < 0)
 612         throw new java::lang::NegativeArraySizeException;
 613       sizes[i] = size;
 614     }
 615   va_end (args);
 616
 617   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 618 }
 619
 620 \f
 621
 622 // Ensure 8-byte alignment, for hash synchronization.
 623 #define DECLARE_PRIM_TYPE(NAME)                 \
 624   _Jv_ArrayVTable _Jv_##NAME##VTable;           \
 625   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 626
 627 DECLARE_PRIM_TYPE(byte)
 628 DECLARE_PRIM_TYPE(short)
 629 DECLARE_PRIM_TYPE(int)
 630 DECLARE_PRIM_TYPE(long)
 631 DECLARE_PRIM_TYPE(boolean)
 632 DECLARE_PRIM_TYPE(char)
 633 DECLARE_PRIM_TYPE(float)
 634 DECLARE_PRIM_TYPE(double)
 635 DECLARE_PRIM_TYPE(void)
 636
 637 void
 638 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len,
 639                    _Jv_ArrayVTable *array_vtable)
 640 {
 641   using namespace java::lang::reflect;
 642
 643   // We must set the vtable for the class; the Java constructor
 644   // doesn't do this.
 645   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 646
 647   // Initialize the fields we care about.  We do this in the same
 648   // order they are declared in Class.h.
 649   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 650   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 651   cl->method_count = sig;
 652   cl->size_in_bytes = len;
 653   cl->vtable = JV_PRIMITIVE_VTABLE;
 654   cl->state = JV_STATE_DONE;
 655   cl->depth = -1;
 656   if (sig != 'V')
 657     _Jv_NewArrayClass (cl, NULL, (_Jv_VTable *) array_vtable);
 658 }
 659
 660 jclass
 661 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 662 {
 663   switch (*sig)
 664     {
 665     case 'B':
 666       return JvPrimClass (byte);
 667     case 'S':
 668       return JvPrimClass (short);
 669     case 'I':
 670       return JvPrimClass (int);
 671     case 'J':
 672       return JvPrimClass (long);
 673     case 'Z':
 674       return JvPrimClass (boolean);
 675     case 'C':
 676       return JvPrimClass (char);
 677     case 'F':
 678       return JvPrimClass (float);
 679     case 'D':
 680       return JvPrimClass (double);
 681     case 'V':
 682       return JvPrimClass (void);
 683     case 'L':
 684       {
 685         int i;
 686         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 687           ;
 688         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 689         return _Jv_FindClass (name, loader);
 690       }
 691     case '[':
 692       {
 693         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 694         if (! klass)
 695           return NULL;
 696         return _Jv_GetArrayClass (klass, loader);
 697       }
 698     }
 699
 700   return NULL;                  // Placate compiler.
 701 }
 702
 703 \f
 704
 705 JArray<jstring> *
 706 JvConvertArgv (int argc, const char **argv)
 707 {
 708   if (argc < 0)
 709     argc = 0;
 710   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 711   jobject *ptr = elements(ar);
 712   jbyteArray bytes = NULL;
 713   for (int i = 0;  i < argc;  i++)
 714     {
 715       const char *arg = argv[i];
 716       int len = strlen (arg);
 717       if (bytes == NULL || bytes->length < len)
 718         bytes = JvNewByteArray (len);
 719       jbyte *bytePtr = elements (bytes);
 720       // We assume jbyte == char.
 721       memcpy (bytePtr, arg, len);
 722
 723       // Now convert using the default encoding.
 724       *ptr++ = new java::lang::String (bytes, 0, len);
 725     }
 726   return (JArray<jstring>*) ar;
 727 }
 728
 729 // FIXME: These variables are static so that they will be
 730 // automatically scanned by the Boehm collector.  This is needed
 731 // because with qthreads the collector won't scan the initial stack --
 732 // it will only scan the qthreads stacks.
 733
 734 // Command line arguments.
 735 static JArray<jstring> *arg_vec;
 736
 737 // The primary thread.
 738 static java::lang::Thread *main_thread;
 739
 740 #ifndef DISABLE_GETENV_PROPERTIES
 741
 742 static char *
 743 next_property_key (char *s, size_t *length)
 744 {
 745   size_t l = 0;
 746
 747   JvAssert (s);
 748
 749   // Skip over whitespace
 750   while (isspace (*s))
 751     s++;
 752
 753   // If we've reached the end, return NULL.  Also return NULL if for
 754   // some reason we've come across a malformed property string.
 755   if (*s == 0
 756       || *s == ':'
 757       || *s == '=')
 758     return NULL;
 759
 760   // Determine the length of the property key.
 761   while (s[l] != 0
 762          && ! isspace (s[l])
 763          && s[l] != ':'
 764          && s[l] != '=')
 765     {
 766       if (s[l] == '\\'
 767           && s[l+1] != 0)
 768         l++;
 769       l++;
 770     }
 771
 772   *length = l;
 773
 774   return s;
 775 }
 776
 777 static char *
 778 next_property_value (char *s, size_t *length)
 779 {
 780   size_t l = 0;
 781
 782   JvAssert (s);
 783
 784   while (isspace (*s))
 785     s++;
 786
 787   if (*s == ':'
 788       || *s == '=')
 789     s++;
 790
 791   while (isspace (*s))
 792     s++;
 793
 794   // If we've reached the end, return NULL.
 795   if (*s == 0)
 796     return NULL;
 797
 798   // Determine the length of the property value.
 799   while (s[l] != 0
 800          && ! isspace (s[l])
 801          && s[l] != ':'
 802          && s[l] != '=')
 803     {
 804       if (s[l] == '\\'
 805           && s[l+1] != 0)
 806         l += 2;
 807       else
 808         l++;
 809     }
 810
 811   *length = l;
 812
 813   return s;
 814 }
 815
 816 static void
 817 process_gcj_properties ()
 818 {
 819   char *props = getenv("GCJ_PROPERTIES");
 820   char *p = props;
 821   size_t length;
 822   size_t property_count = 0;
 823
 824   if (NULL == props)
 825     return;
 826
 827   // Whip through props quickly in order to count the number of
 828   // property values.
 829   while (p && (p = next_property_key (p, &length)))
 830     {
 831       // Skip to the end of the key
 832       p += length;
 833
 834       p = next_property_value (p, &length);
 835       if (p)
 836         p += length;
 837
 838       property_count++;
 839     }
 840
 841   // Allocate an array of property value/key pairs.
 842   _Jv_Environment_Properties =
 843     (property_pair *) malloc (sizeof(property_pair)
 844                               * (property_count + 1));
 845
 846   // Go through the properties again, initializing _Jv_Properties
 847   // along the way.
 848   p = props;
 849   property_count = 0;
 850   while (p && (p = next_property_key (p, &length)))
 851     {
 852       _Jv_Environment_Properties[property_count].key = p;
 853       _Jv_Environment_Properties[property_count].key_length = length;
 854
 855       // Skip to the end of the key
 856       p += length;
 857
 858       p = next_property_value (p, &length);
 859
 860       _Jv_Environment_Properties[property_count].value = p;
 861       _Jv_Environment_Properties[property_count].value_length = length;
 862
 863       if (p)
 864         p += length;
 865
 866       property_count++;
 867     }
 868   memset ((void *) &_Jv_Environment_Properties[property_count],
 869           0, sizeof (property_pair));
 870   {
 871     size_t i = 0;
 872
 873     // Null terminate the strings.
 874     while (_Jv_Environment_Properties[i].key)
 875       {
 876         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 877         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 878       }
 879   }
 880 }
 881 #endif // DISABLE_GETENV_PROPERTIES
 882
 883 namespace gcj
 884 {
 885   _Jv_Utf8Const *void_signature;
 886   _Jv_Utf8Const *clinit_name;
 887   _Jv_Utf8Const *init_name;
 888   _Jv_Utf8Const *finit_name;
 889
 890   bool runtimeInitialized = false;
 891 }
 892
 893 jint
 894 _Jv_CreateJavaVM (void* /*vm_args*/)
 895 {
 896   using namespace gcj;
 897
 898   if (runtimeInitialized)
 899     return -1;
 900
 901   runtimeInitialized = true;
 902
 903   PROCESS_GCJ_PROPERTIES;
 904
 905   _Jv_InitThreads ();
 906   _Jv_InitGC ();
 907   _Jv_InitializeSyncMutex ();
 908
 909   /* Initialize Utf8 constants declared in jvm.h. */
 910   void_signature = _Jv_makeUtf8Const ("()V", 3);
 911   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 912   init_name = _Jv_makeUtf8Const ("<init>", 6);
 913   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 914
 915   /* Initialize built-in classes to represent primitive TYPEs. */
 916   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1, &_Jv_byteVTable);
 917   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2, &_Jv_shortVTable);
 918   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4, &_Jv_intVTable);
 919   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8, &_Jv_longVTable);
 920   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1, &_Jv_booleanVTable);
 921   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2, &_Jv_charVTable);
 922   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4, &_Jv_floatVTable);
 923   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8, &_Jv_doubleVTable);
 924   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0, &_Jv_voidVTable);
 925
 926   // Turn stack trace generation off while creating exception objects.
 927   _Jv_InitClass (&java::lang::VMThrowable::class$);
 928   java::lang::VMThrowable::trace_enabled = 0;
 929
 930   // We have to initialize this fairly early, to avoid circular class
 931   // initialization.  In particular we want to start the
 932   // initialization of ClassLoader before we start the initialization
 933   // of VMClassLoader.
 934   _Jv_InitClass (&java::lang::ClassLoader::class$);
 935   // Once the bootstrap loader is in place, change it into a kind of
 936   // system loader, by having it read the class path.
 937   gnu::gcj::runtime::VMClassLoader::initialize();
 938
 939   INIT_SEGV;
 940 #ifdef HANDLE_FPE
 941   INIT_FPE;
 942 #endif
 943
 944   no_memory = new java::lang::OutOfMemoryError;
 945
 946   java::lang::VMThrowable::trace_enabled = 1;
 947
 948 #ifdef USE_LTDL
 949   LTDL_SET_PRELOADED_SYMBOLS ();
 950 #endif
 951
 952   _Jv_platform_initialize ();
 953
 954   _Jv_JNI_Init ();
 955
 956   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
 957
 958   // Start the GC finalizer thread.  A VirtualMachineError can be
 959   // thrown by the runtime if, say, threads aren't available.  In this
 960   // case finalizers simply won't run.
 961   try
 962     {
 963       using namespace gnu::gcj::runtime;
 964       FinalizerThread *ft = new FinalizerThread ();
 965       ft->start ();
 966     }
 967   catch (java::lang::VirtualMachineError *ignore)
 968     {
 969     }
 970
 971   return 0;
 972 }
 973
 974 void
 975 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 976              bool is_jar)
 977 {
 978   _Jv_SetArgs (argc, argv);
 979
 980   java::lang::Runtime *runtime = NULL;
 981
 982   try
 983     {
 984       // Set this very early so that it is seen when java.lang.System
 985       // is initialized.
 986       if (is_jar)
 987         _Jv_Jar_Class_Path = strdup (name);
 988       _Jv_CreateJavaVM (NULL);
 989
 990       // Get the Runtime here.  We want to initialize it before searching
 991       // for `main'; that way it will be set up if `main' is a JNI method.
 992       runtime = java::lang::Runtime::getRuntime ();
 993
 994 #ifdef DISABLE_MAIN_ARGS
 995       arg_vec = JvConvertArgv (0, 0);
 996 #else
 997       arg_vec = JvConvertArgv (argc - 1, argv + 1);
 998 #endif
 999
1000       using namespace gnu::gcj::runtime;
1001       if (klass)
1002         main_thread = new FirstThread (klass, arg_vec);
1003       else
1004         main_thread = new FirstThread (JvNewStringLatin1 (name),
1005                                        arg_vec, is_jar);
1006     }
1007   catch (java::lang::Throwable *t)
1008     {
1009       java::lang::System::err->println (JvNewStringLatin1
1010         ("Exception during runtime initialization"));
1011       t->printStackTrace();
1012       runtime->exit (1);
1013     }
1014
1015   _Jv_AttachCurrentThread (main_thread);
1016   _Jv_ThreadRun (main_thread);
1017   _Jv_ThreadWait ();
1018
1019   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1020   runtime->exit (status);
1021 }
1022
1023 void
1024 JvRunMain (jclass klass, int argc, const char **argv)
1025 {
1026   _Jv_RunMain (klass, NULL, argc, argv, false);
1027 }
1028
1029 \f
1030
1031 // Parse a string and return a heap size.
1032 static size_t
1033 parse_heap_size (const char *spec)
1034 {
1035   char *end;
1036   unsigned long val = strtoul (spec, &end, 10);
1037   if (*end == 'k' || *end == 'K')
1038     val *= 1024;
1039   else if (*end == 'm' || *end == 'M')
1040     val *= 1048576;
1041   return (size_t) val;
1042 }
1043
1044 // Set the initial heap size.  This might be ignored by the GC layer.
1045 // This must be called before _Jv_RunMain.
1046 void
1047 _Jv_SetInitialHeapSize (const char *arg)
1048 {
1049   size_t size = parse_heap_size (arg);
1050   _Jv_GCSetInitialHeapSize (size);
1051 }
1052
1053 // Set the maximum heap size.  This might be ignored by the GC layer.
1054 // This must be called before _Jv_RunMain.
1055 void
1056 _Jv_SetMaximumHeapSize (const char *arg)
1057 {
1058   size_t size = parse_heap_size (arg);
1059   _Jv_GCSetMaximumHeapSize (size);
1060 }
1061
1062 \f
1063
1064 void *
1065 _Jv_Malloc (jsize size)
1066 {
1067   if (__builtin_expect (size == 0, false))
1068     size = 1;
1069   void *ptr = malloc ((size_t) size);
1070   if (__builtin_expect (ptr == NULL, false))
1071     throw no_memory;
1072   return ptr;
1073 }
1074
1075 void *
1076 _Jv_Realloc (void *ptr, jsize size)
1077 {
1078   if (__builtin_expect (size == 0, false))
1079     size = 1;
1080   ptr = realloc (ptr, (size_t) size);
1081   if (__builtin_expect (ptr == NULL, false))
1082     throw no_memory;
1083   return ptr;
1084 }
1085
1086 void *
1087 _Jv_MallocUnchecked (jsize size)
1088 {
1089   if (__builtin_expect (size == 0, false))
1090     size = 1;
1091   return malloc ((size_t) size);
1092 }
1093
1094 void
1095 _Jv_Free (void* ptr)
1096 {
1097   return free (ptr);
1098 }
1099
1100 \f
1101
1102 // In theory, these routines can be #ifdef'd away on machines which
1103 // support divide overflow signals.  However, we never know if some
1104 // code might have been compiled with "-fuse-divide-subroutine", so we
1105 // always include them in libgcj.
1106
1107 jint
1108 _Jv_divI (jint dividend, jint divisor)
1109 {
1110   if (__builtin_expect (divisor == 0, false))
1111     {
1112       java::lang::ArithmeticException *arithexception
1113         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1114       throw arithexception;
1115     }
1116
1117   if (dividend == (jint) 0x80000000L && divisor == -1)
1118     return dividend;
1119
1120   return dividend / divisor;
1121 }
1122
1123 jint
1124 _Jv_remI (jint dividend, jint divisor)
1125 {
1126   if (__builtin_expect (divisor == 0, false))
1127     {
1128       java::lang::ArithmeticException *arithexception
1129         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1130       throw arithexception;
1131     }
1132
1133   if (dividend == (jint) 0x80000000L && divisor == -1)
1134     return 0;
1135
1136   return dividend % divisor;
1137 }
1138
1139 jlong
1140 _Jv_divJ (jlong dividend, jlong divisor)
1141 {
1142   if (__builtin_expect (divisor == 0, false))
1143     {
1144       java::lang::ArithmeticException *arithexception
1145         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1146       throw arithexception;
1147     }
1148
1149   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1150     return dividend;
1151
1152   return dividend / divisor;
1153 }
1154
1155 jlong
1156 _Jv_remJ (jlong dividend, jlong divisor)
1157 {
1158   if (__builtin_expect (divisor == 0, false))
1159     {
1160       java::lang::ArithmeticException *arithexception
1161         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1162       throw arithexception;
1163     }
1164
1165   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1166     return 0;
1167
1168   return dividend % divisor;
1169 }
1170
1171 \f
1172
1173 // Return true if SELF_KLASS can access a field or method in
1174 // OTHER_KLASS.  The field or method's access flags are specified in
1175 // FLAGS.
1176 jboolean
1177 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1178 {
1179   using namespace java::lang::reflect;
1180   return ((self_klass == other_klass)
1181           || ((flags & Modifier::PUBLIC) != 0)
1182           || (((flags & Modifier::PROTECTED) != 0)
1183               && other_klass->isAssignableFrom (self_klass))
1184           || (((flags & Modifier::PRIVATE) == 0)
1185               && _Jv_ClassNameSamePackage (self_klass->name,
1186                                            other_klass->name)));
1187 }