libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003  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 // Largest representable size_t.
  74 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  75
  76 static const char *no_properties[] = { NULL };
  77
  78 // Properties set at compile time.
  79 const char **_Jv_Compiler_Properties = no_properties;
  80
  81 // The JAR file to add to the beginning of java.class.path.
  82 const char *_Jv_Jar_Class_Path;
  83
  84 #ifndef DISABLE_GETENV_PROPERTIES
  85 // Property key/value pairs.
  86 property_pair *_Jv_Environment_Properties;
  87 #endif
  88
  89 // Stash the argv pointer to benefit native libraries that need it.
  90 const char **_Jv_argv;
  91 int _Jv_argc;
  92
  93 // Argument support.
  94 int
  95 _Jv_GetNbArgs (void)
  96 {
  97   // _Jv_argc is 0 if not explicitly initialized.
  98   return _Jv_argc;
  99 }
 100
 101 const char *
 102 _Jv_GetSafeArg (int index)
 103 {
 104   if (index >=0 && index < _Jv_GetNbArgs ())
 105     return _Jv_argv[index];
 106   else
 107     return "";
 108 }
 109
 110 void
 111 _Jv_SetArgs (int argc, const char **argv)
 112 {
 113   _Jv_argc = argc;
 114   _Jv_argv = argv;
 115 }
 116
 117 #ifdef ENABLE_JVMPI
 118 // Pointer to JVMPI notification functions.
 119 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 120 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 121 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 122 #endif
 123 \f
 124
 125 #ifdef HANDLE_SEGV
 126 SIGNAL_HANDLER (catch_segv)
 127 {
 128   java::lang::NullPointerException *nullp
 129     = new java::lang::NullPointerException;
 130   MAKE_THROW_FRAME (nullp);
 131   throw nullp;
 132 }
 133 #endif
 134
 135 #ifdef HANDLE_FPE
 136 SIGNAL_HANDLER (catch_fpe)
 137 {
 138   java::lang::ArithmeticException *arithexception
 139     = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
 140 #ifdef HANDLE_DIVIDE_OVERFLOW
 141   HANDLE_DIVIDE_OVERFLOW;
 142 #else
 143   MAKE_THROW_FRAME (arithexception);
 144 #endif
 145   throw arithexception;
 146 }
 147 #endif
 148
 149 \f
 150
 151 jboolean
 152 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 153 {
 154   int len;
 155   _Jv_ushort *aptr, *bptr;
 156   if (a == b)
 157     return true;
 158   if (a->hash != b->hash)
 159     return false;
 160   len = a->length;
 161   if (b->length != len)
 162     return false;
 163   aptr = (_Jv_ushort *)a->data;
 164   bptr = (_Jv_ushort *)b->data;
 165   len = (len + 1) >> 1;
 166   while (--len >= 0)
 167     if (*aptr++ != *bptr++)
 168       return false;
 169   return true;
 170 }
 171
 172 /* True iff A is equal to STR.
 173    HASH is STR->hashCode().
 174 */
 175
 176 jboolean
 177 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 178 {
 179   if (a->hash != (_Jv_ushort) hash)
 180     return false;
 181   jint len = str->length();
 182   jint i = 0;
 183   jchar *sptr = _Jv_GetStringChars (str);
 184   unsigned char* ptr = (unsigned char*) a->data;
 185   unsigned char* limit = ptr + a->length;
 186   for (;; i++, sptr++)
 187     {
 188       int ch = UTF8_GET (ptr, limit);
 189       if (i == len)
 190         return ch < 0;
 191       if (ch != *sptr)
 192         return false;
 193     }
 194   return true;
 195 }
 196
 197 /* Like _Jv_equal, but stop after N characters.  */
 198 jboolean
 199 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 200 {
 201   jint len = str->length();
 202   jint i = 0;
 203   jchar *sptr = _Jv_GetStringChars (str);
 204   unsigned char* ptr = (unsigned char*) a->data;
 205   unsigned char* limit = ptr + a->length;
 206   for (; n-- > 0; i++, sptr++)
 207     {
 208       int ch = UTF8_GET (ptr, limit);
 209       if (i == len)
 210         return ch < 0;
 211       if (ch != *sptr)
 212         return false;
 213     }
 214   return true;
 215 }
 216
 217 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 218 int
 219 _Jv_strLengthUtf8(char* str, int len)
 220 {
 221   unsigned char* ptr;
 222   unsigned char* limit;
 223   int str_length;
 224
 225   ptr = (unsigned char*) str;
 226   limit = ptr + len;
 227   str_length = 0;
 228   for (; ptr < limit; str_length++)
 229     {
 230       if (UTF8_GET (ptr, limit) < 0)
 231         return (-1);
 232     }
 233   return (str_length);
 234 }
 235
 236 /* Calculate a hash value for a string encoded in Utf8 format.
 237  * This returns the same hash value as specified or java.lang.String.hashCode.
 238  */
 239 static jint
 240 hashUtf8String (char* str, int len)
 241 {
 242   unsigned char* ptr = (unsigned char*) str;
 243   unsigned char* limit = ptr + len;
 244   jint hash = 0;
 245
 246   for (; ptr < limit;)
 247     {
 248       int ch = UTF8_GET (ptr, limit);
 249       /* Updated specification from
 250          http://www.javasoft.com/docs/books/jls/clarify.html. */
 251       hash = (31 * hash) + ch;
 252     }
 253   return hash;
 254 }
 255
 256 _Jv_Utf8Const *
 257 _Jv_makeUtf8Const (char* s, int len)
 258 {
 259   if (len < 0)
 260     len = strlen (s);
 261   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 262   memcpy (m->data, s, len);
 263   m->data[len] = 0;
 264   m->length = len;
 265   m->hash = hashUtf8String (s, len) & 0xFFFF;
 266   return (m);
 267 }
 268
 269 _Jv_Utf8Const *
 270 _Jv_makeUtf8Const (jstring string)
 271 {
 272   jint hash = string->hashCode ();
 273   jint len = _Jv_GetStringUTFLength (string);
 274
 275   Utf8Const* m = (Utf8Const*)
 276     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 277
 278   m->hash = hash;
 279   m->length = len;
 280
 281   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 282   m->data[len] = 0;
 283
 284   return m;
 285 }
 286
 287 \f
 288
 289 #ifdef DEBUG
 290 void
 291 _Jv_Abort (const char *function, const char *file, int line,
 292            const char *message)
 293 #else
 294 void
 295 _Jv_Abort (const char *, const char *, int, const char *message)
 296 #endif
 297 {
 298 #ifdef DEBUG
 299   fprintf (stderr,
 300            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 301            message, function, file, line);
 302 #else
 303   fprintf (stderr, "libgcj failure: %s\n", message);
 304 #endif
 305   abort ();
 306 }
 307
 308 static void
 309 fail_on_finalization (jobject)
 310 {
 311   JvFail ("object was finalized");
 312 }
 313
 314 void
 315 _Jv_GCWatch (jobject obj)
 316 {
 317   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 318 }
 319
 320 void
 321 _Jv_ThrowBadArrayIndex(jint bad_index)
 322 {
 323   throw new java::lang::ArrayIndexOutOfBoundsException
 324     (java::lang::String::valueOf (bad_index));
 325 }
 326
 327 void
 328 _Jv_ThrowNullPointerException ()
 329 {
 330   throw new java::lang::NullPointerException;
 331 }
 332
 333 // Explicitly throw a no memory exception.
 334 // The collector calls this when it encounters an out-of-memory condition.
 335 void _Jv_ThrowNoMemory()
 336 {
 337   throw no_memory;
 338 }
 339
 340 #ifdef ENABLE_JVMPI
 341 static void
 342 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 343 {
 344   // Service JVMPI allocation request.
 345   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 346     {
 347       JVMPI_Event event;
 348
 349       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 350       event.env_id = NULL;
 351       event.u.obj_alloc.arena_id = 0;
 352       event.u.obj_alloc.class_id = (jobjectID) klass;
 353       event.u.obj_alloc.is_array = 0;
 354       event.u.obj_alloc.size = size;
 355       event.u.obj_alloc.obj_id = (jobjectID) obj;
 356
 357       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 358       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 359       // More importantly, I don't see the need for disabling GC, since we
 360       // blatantly have a pointer to obj on our stack, ensuring that the
 361       // object can't be collected.  Even for a nonconservative collector,
 362       // it appears to me that this must be true, since we are about to
 363       // return obj. Isn't this whole approach way too intrusive for
 364       // a useful profiling interface?                  - HB
 365       _Jv_DisableGC ();
 366       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 367       _Jv_EnableGC ();
 368     }
 369 }
 370 #else /* !ENABLE_JVMPI */
 371 # define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 372 #endif
 373
 374 // Allocate a new object of class KLASS.  SIZE is the size of the object
 375 // to allocate.  You might think this is redundant, but it isn't; some
 376 // classes, such as String, aren't of fixed size.
 377 // First a version that assumes that we have no finalizer, and that
 378 // the class is already initialized.
 379 // If we know that JVMPI is disabled, this can be replaced by a direct call
 380 // to the allocator for the appropriate GC.
 381 jobject
 382 _Jv_AllocObjectNoInitNoFinalizer (jclass klass, jint size)
 383 {
 384   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 385   jvmpi_notify_alloc (klass, size, obj);
 386   return obj;
 387 }
 388
 389 // And now a version that initializes if necessary.
 390 jobject
 391 _Jv_AllocObjectNoFinalizer (jclass klass, jint size)
 392 {
 393   _Jv_InitClass (klass);
 394   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 395   jvmpi_notify_alloc (klass, size, obj);
 396   return obj;
 397 }
 398
 399 // And now the general version that registers a finalizer if necessary.
 400 jobject
 401 _Jv_AllocObject (jclass klass, jint size)
 402 {
 403   jobject obj = _Jv_AllocObjectNoFinalizer (klass, size);
 404
 405   // We assume that the compiler only generates calls to this routine
 406   // if there really is an interesting finalizer.
 407   // Unfortunately, we still have to the dynamic test, since there may
 408   // be cni calls to this routine.
 409   // Note that on IA64 get_finalizer() returns the starting address of the
 410   // function, not a function pointer.  Thus this still works.
 411   if (klass->vtable->get_finalizer ()
 412       != java::lang::Object::class$.vtable->get_finalizer ())
 413     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 414   return obj;
 415 }
 416
 417 // A version of the above that assumes the object contains no pointers,
 418 // and requires no finalization.  This can't happen if we need pointers
 419 // to locks.
 420 #ifdef JV_HASH_SYNCHRONIZATION
 421 jobject
 422 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 423 {
 424   _Jv_InitClass (klass);
 425
 426   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 427
 428 #ifdef ENABLE_JVMPI
 429   // Service JVMPI request.
 430
 431   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 432     {
 433       JVMPI_Event event;
 434
 435       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 436       event.env_id = NULL;
 437       event.u.obj_alloc.arena_id = 0;
 438       event.u.obj_alloc.class_id = (jobjectID) klass;
 439       event.u.obj_alloc.is_array = 0;
 440       event.u.obj_alloc.size = size;
 441       event.u.obj_alloc.obj_id = (jobjectID) obj;
 442
 443       _Jv_DisableGC ();
 444       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 445       _Jv_EnableGC ();
 446     }
 447 #endif
 448
 449   return obj;
 450 }
 451 #endif /* JV_HASH_SYNCHRONIZATION */
 452
 453
 454 // Allocate a new array of Java objects.  Each object is of type
 455 // `elementClass'.  `init' is used to initialize each slot in the
 456 // array.
 457 jobjectArray
 458 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 459 {
 460   if (__builtin_expect (count < 0, false))
 461     throw new java::lang::NegativeArraySizeException;
 462
 463   JvAssert (! elementClass->isPrimitive ());
 464
 465   // Ensure that elements pointer is properly aligned.
 466   jobjectArray obj = NULL;
 467   size_t size = (size_t) elements (obj);
 468   size += count * sizeof (jobject);
 469
 470   jclass klass = _Jv_GetArrayClass (elementClass,
 471                                     elementClass->getClassLoaderInternal());
 472
 473   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 474   // Cast away const.
 475   jsize *lp = const_cast<jsize *> (&obj->length);
 476   *lp = count;
 477   // We know the allocator returns zeroed memory.  So don't bother
 478   // zeroing it again.
 479   if (init)
 480     {
 481       jobject *ptr = elements(obj);
 482       while (--count >= 0)
 483         *ptr++ = init;
 484     }
 485   return obj;
 486 }
 487
 488 // Allocate a new array of primitives.  ELTYPE is the type of the
 489 // element, COUNT is the size of the array.
 490 jobject
 491 _Jv_NewPrimArray (jclass eltype, jint count)
 492 {
 493   int elsize = eltype->size();
 494   if (__builtin_expect (count < 0, false))
 495     throw new java::lang::NegativeArraySizeException;
 496
 497   JvAssert (eltype->isPrimitive ());
 498   jobject dummy = NULL;
 499   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 500
 501   // Check for overflow.
 502   if (__builtin_expect ((size_t) count >
 503                         (SIZE_T_MAX - size) / elsize, false))
 504     throw no_memory;
 505
 506   jclass klass = _Jv_GetArrayClass (eltype, 0);
 507
 508 # ifdef JV_HASH_SYNCHRONIZATION
 509   // Since the vtable is always statically allocated,
 510   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 511   __JArray *arr =
 512     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 513   memset((char *)arr + size, 0, elsize * count);
 514 # else
 515   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 516   // Note that we assume we are given zeroed memory by the allocator.
 517 # endif
 518   // Cast away const.
 519   jsize *lp = const_cast<jsize *> (&arr->length);
 520   *lp = count;
 521
 522   return arr;
 523 }
 524
 525 jobject
 526 _Jv_NewArray (jint type, jint size)
 527 {
 528   switch (type)
 529     {
 530       case  4:  return JvNewBooleanArray (size);
 531       case  5:  return JvNewCharArray (size);
 532       case  6:  return JvNewFloatArray (size);
 533       case  7:  return JvNewDoubleArray (size);
 534       case  8:  return JvNewByteArray (size);
 535       case  9:  return JvNewShortArray (size);
 536       case 10:  return JvNewIntArray (size);
 537       case 11:  return JvNewLongArray (size);
 538     }
 539   throw new java::lang::InternalError
 540     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 541 }
 542
 543 // Allocate a possibly multi-dimensional array but don't check that
 544 // any array length is <0.
 545 static jobject
 546 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 547 {
 548   JvAssert (type->isArray());
 549   jclass element_type = type->getComponentType();
 550   jobject result;
 551   if (element_type->isPrimitive())
 552     result = _Jv_NewPrimArray (element_type, sizes[0]);
 553   else
 554     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 555
 556   if (dimensions > 1)
 557     {
 558       JvAssert (! element_type->isPrimitive());
 559       JvAssert (element_type->isArray());
 560       jobject *contents = elements ((jobjectArray) result);
 561       for (int i = 0; i < sizes[0]; ++i)
 562         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 563                                                   sizes + 1);
 564     }
 565
 566   return result;
 567 }
 568
 569 jobject
 570 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 571 {
 572   for (int i = 0; i < dimensions; ++i)
 573     if (sizes[i] < 0)
 574       throw new java::lang::NegativeArraySizeException;
 575
 576   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 577 }
 578
 579 jobject
 580 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 581 {
 582   va_list args;
 583   jint sizes[dimensions];
 584   va_start (args, dimensions);
 585   for (int i = 0; i < dimensions; ++i)
 586     {
 587       jint size = va_arg (args, jint);
 588       if (size < 0)
 589         throw new java::lang::NegativeArraySizeException;
 590       sizes[i] = size;
 591     }
 592   va_end (args);
 593
 594   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 595 }
 596
 597 \f
 598
 599 // Ensure 8-byte alignment, for hash synchronization.
 600 #define DECLARE_PRIM_TYPE(NAME)                 \
 601   _Jv_ArrayVTable _Jv_##NAME##VTable;           \
 602   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 603
 604 DECLARE_PRIM_TYPE(byte)
 605 DECLARE_PRIM_TYPE(short)
 606 DECLARE_PRIM_TYPE(int)
 607 DECLARE_PRIM_TYPE(long)
 608 DECLARE_PRIM_TYPE(boolean)
 609 DECLARE_PRIM_TYPE(char)
 610 DECLARE_PRIM_TYPE(float)
 611 DECLARE_PRIM_TYPE(double)
 612 DECLARE_PRIM_TYPE(void)
 613
 614 void
 615 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len,
 616                    _Jv_ArrayVTable *array_vtable)
 617 {
 618   using namespace java::lang::reflect;
 619
 620   _Jv_InitNewClassFields (cl);
 621
 622   // We must set the vtable for the class; the Java constructor
 623   // doesn't do this.
 624   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 625
 626   // Initialize the fields we care about.  We do this in the same
 627   // order they are declared in Class.h.
 628   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 629   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 630   cl->method_count = sig;
 631   cl->size_in_bytes = len;
 632   cl->vtable = JV_PRIMITIVE_VTABLE;
 633   cl->state = JV_STATE_DONE;
 634   cl->depth = -1;
 635   if (sig != 'V')
 636     _Jv_NewArrayClass (cl, NULL, (_Jv_VTable *) array_vtable);
 637 }
 638
 639 jclass
 640 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 641 {
 642   switch (*sig)
 643     {
 644     case 'B':
 645       return JvPrimClass (byte);
 646     case 'S':
 647       return JvPrimClass (short);
 648     case 'I':
 649       return JvPrimClass (int);
 650     case 'J':
 651       return JvPrimClass (long);
 652     case 'Z':
 653       return JvPrimClass (boolean);
 654     case 'C':
 655       return JvPrimClass (char);
 656     case 'F':
 657       return JvPrimClass (float);
 658     case 'D':
 659       return JvPrimClass (double);
 660     case 'V':
 661       return JvPrimClass (void);
 662     case 'L':
 663       {
 664         int i;
 665         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 666           ;
 667         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 668         return _Jv_FindClass (name, loader);
 669       }
 670     case '[':
 671       {
 672         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 673         if (! klass)
 674           return NULL;
 675         return _Jv_GetArrayClass (klass, loader);
 676       }
 677     }
 678
 679   return NULL;                  // Placate compiler.
 680 }
 681
 682 \f
 683
 684 JArray<jstring> *
 685 JvConvertArgv (int argc, const char **argv)
 686 {
 687   if (argc < 0)
 688     argc = 0;
 689   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 690   jobject *ptr = elements(ar);
 691   jbyteArray bytes = NULL;
 692   for (int i = 0;  i < argc;  i++)
 693     {
 694       const char *arg = argv[i];
 695       int len = strlen (arg);
 696       if (bytes == NULL || bytes->length < len)
 697         bytes = JvNewByteArray (len);
 698       jbyte *bytePtr = elements (bytes);
 699       // We assume jbyte == char.
 700       memcpy (bytePtr, arg, len);
 701
 702       // Now convert using the default encoding.
 703       *ptr++ = new java::lang::String (bytes, 0, len);
 704     }
 705   return (JArray<jstring>*) ar;
 706 }
 707
 708 // FIXME: These variables are static so that they will be
 709 // automatically scanned by the Boehm collector.  This is needed
 710 // because with qthreads the collector won't scan the initial stack --
 711 // it will only scan the qthreads stacks.
 712
 713 // Command line arguments.
 714 static JArray<jstring> *arg_vec;
 715
 716 // The primary thread.
 717 static java::lang::Thread *main_thread;
 718
 719 #ifndef DISABLE_GETENV_PROPERTIES
 720
 721 static char *
 722 next_property_key (char *s, size_t *length)
 723 {
 724   size_t l = 0;
 725
 726   JvAssert (s);
 727
 728   // Skip over whitespace
 729   while (isspace (*s))
 730     s++;
 731
 732   // If we've reached the end, return NULL.  Also return NULL if for
 733   // some reason we've come across a malformed property string.
 734   if (*s == 0
 735       || *s == ':'
 736       || *s == '=')
 737     return NULL;
 738
 739   // Determine the length of the property key.
 740   while (s[l] != 0
 741          && ! isspace (s[l])
 742          && s[l] != ':'
 743          && s[l] != '=')
 744     {
 745       if (s[l] == '\\'
 746           && s[l+1] != 0)
 747         l++;
 748       l++;
 749     }
 750
 751   *length = l;
 752
 753   return s;
 754 }
 755
 756 static char *
 757 next_property_value (char *s, size_t *length)
 758 {
 759   size_t l = 0;
 760
 761   JvAssert (s);
 762
 763   while (isspace (*s))
 764     s++;
 765
 766   if (*s == ':'
 767       || *s == '=')
 768     s++;
 769
 770   while (isspace (*s))
 771     s++;
 772
 773   // If we've reached the end, return NULL.
 774   if (*s == 0)
 775     return NULL;
 776
 777   // Determine the length of the property value.
 778   while (s[l] != 0
 779          && ! isspace (s[l])
 780          && s[l] != ':'
 781          && s[l] != '=')
 782     {
 783       if (s[l] == '\\'
 784           && s[l+1] != 0)
 785         l += 2;
 786       else
 787         l++;
 788     }
 789
 790   *length = l;
 791
 792   return s;
 793 }
 794
 795 static void
 796 process_gcj_properties ()
 797 {
 798   char *props = getenv("GCJ_PROPERTIES");
 799   char *p = props;
 800   size_t length;
 801   size_t property_count = 0;
 802
 803   if (NULL == props)
 804     return;
 805
 806   // Whip through props quickly in order to count the number of
 807   // property values.
 808   while (p && (p = next_property_key (p, &length)))
 809     {
 810       // Skip to the end of the key
 811       p += length;
 812
 813       p = next_property_value (p, &length);
 814       if (p)
 815         p += length;
 816
 817       property_count++;
 818     }
 819
 820   // Allocate an array of property value/key pairs.
 821   _Jv_Environment_Properties =
 822     (property_pair *) malloc (sizeof(property_pair)
 823                               * (property_count + 1));
 824
 825   // Go through the properties again, initializing _Jv_Properties
 826   // along the way.
 827   p = props;
 828   property_count = 0;
 829   while (p && (p = next_property_key (p, &length)))
 830     {
 831       _Jv_Environment_Properties[property_count].key = p;
 832       _Jv_Environment_Properties[property_count].key_length = length;
 833
 834       // Skip to the end of the key
 835       p += length;
 836
 837       p = next_property_value (p, &length);
 838
 839       _Jv_Environment_Properties[property_count].value = p;
 840       _Jv_Environment_Properties[property_count].value_length = length;
 841
 842       if (p)
 843         p += length;
 844
 845       property_count++;
 846     }
 847   memset ((void *) &_Jv_Environment_Properties[property_count],
 848           0, sizeof (property_pair));
 849   {
 850     size_t i = 0;
 851
 852     // Null terminate the strings.
 853     while (_Jv_Environment_Properties[i].key)
 854       {
 855         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 856         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 857       }
 858   }
 859 }
 860 #endif // DISABLE_GETENV_PROPERTIES
 861
 862 namespace gcj
 863 {
 864   _Jv_Utf8Const *void_signature;
 865   _Jv_Utf8Const *clinit_name;
 866   _Jv_Utf8Const *init_name;
 867   _Jv_Utf8Const *finit_name;
 868
 869   bool runtimeInitialized = false;
 870 }
 871
 872 jint
 873 _Jv_CreateJavaVM (void* /*vm_args*/)
 874 {
 875   using namespace gcj;
 876
 877   if (runtimeInitialized)
 878     return -1;
 879
 880   runtimeInitialized = true;
 881
 882   PROCESS_GCJ_PROPERTIES;
 883
 884   _Jv_InitThreads ();
 885   _Jv_InitGC ();
 886   _Jv_InitializeSyncMutex ();
 887
 888   /* Initialize Utf8 constants declared in jvm.h. */
 889   void_signature = _Jv_makeUtf8Const ("()V", 3);
 890   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 891   init_name = _Jv_makeUtf8Const ("<init>", 6);
 892   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 893
 894   /* Initialize built-in classes to represent primitive TYPEs. */
 895   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1, &_Jv_byteVTable);
 896   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2, &_Jv_shortVTable);
 897   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4, &_Jv_intVTable);
 898   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8, &_Jv_longVTable);
 899   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1, &_Jv_booleanVTable);
 900   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2, &_Jv_charVTable);
 901   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4, &_Jv_floatVTable);
 902   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8, &_Jv_doubleVTable);
 903   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0, &_Jv_voidVTable);
 904
 905   // Turn stack trace generation off while creating exception objects.
 906   _Jv_InitClass (&java::lang::VMThrowable::class$);
 907   java::lang::VMThrowable::trace_enabled = 0;
 908
 909   INIT_SEGV;
 910 #ifdef HANDLE_FPE
 911   INIT_FPE;
 912 #endif
 913
 914   no_memory = new java::lang::OutOfMemoryError;
 915
 916   java::lang::VMThrowable::trace_enabled = 1;
 917
 918 #ifdef USE_LTDL
 919   LTDL_SET_PRELOADED_SYMBOLS ();
 920 #endif
 921
 922   _Jv_platform_initialize ();
 923
 924   _Jv_JNI_Init ();
 925
 926   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
 927
 928   // Start the GC finalizer thread.  A VirtualMachineError can be
 929   // thrown by the runtime if, say, threads aren't available.  In this
 930   // case finalizers simply won't run.
 931   try
 932     {
 933       using namespace gnu::gcj::runtime;
 934       FinalizerThread *ft = new FinalizerThread ();
 935       ft->start ();
 936     }
 937   catch (java::lang::VirtualMachineError *ignore)
 938     {
 939     }
 940
 941   return 0;
 942 }
 943
 944 void
 945 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 946              bool is_jar)
 947 {
 948   _Jv_SetArgs (argc, argv);
 949
 950   java::lang::Runtime *runtime = NULL;
 951
 952   try
 953     {
 954       // Set this very early so that it is seen when java.lang.System
 955       // is initialized.
 956       if (is_jar)
 957         _Jv_Jar_Class_Path = strdup (name);
 958       _Jv_CreateJavaVM (NULL);
 959
 960       // Get the Runtime here.  We want to initialize it before searching
 961       // for `main'; that way it will be set up if `main' is a JNI method.
 962       runtime = java::lang::Runtime::getRuntime ();
 963
 964 #ifdef DISABLE_MAIN_ARGS
 965       arg_vec = JvConvertArgv (0, 0);
 966 #else
 967       arg_vec = JvConvertArgv (argc - 1, argv + 1);
 968 #endif
 969
 970       using namespace gnu::gcj::runtime;
 971       if (klass)
 972         main_thread = new FirstThread (klass, arg_vec);
 973       else
 974         main_thread = new FirstThread (JvNewStringLatin1 (name),
 975                                        arg_vec, is_jar);
 976     }
 977   catch (java::lang::Throwable *t)
 978     {
 979       java::lang::System::err->println (JvNewStringLatin1
 980         ("Exception during runtime initialization"));
 981       t->printStackTrace();
 982       runtime->exit (1);
 983     }
 984
 985   _Jv_AttachCurrentThread (main_thread);
 986   _Jv_ThreadRun (main_thread);
 987   _Jv_ThreadWait ();
 988
 989   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 990   runtime->exit (status);
 991 }
 992
 993 void
 994 JvRunMain (jclass klass, int argc, const char **argv)
 995 {
 996   _Jv_RunMain (klass, NULL, argc, argv, false);
 997 }
 998
 999 \f
1000
1001 // Parse a string and return a heap size.
1002 static size_t
1003 parse_heap_size (const char *spec)
1004 {
1005   char *end;
1006   unsigned long val = strtoul (spec, &end, 10);
1007   if (*end == 'k' || *end == 'K')
1008     val *= 1024;
1009   else if (*end == 'm' || *end == 'M')
1010     val *= 1048576;
1011   return (size_t) val;
1012 }
1013
1014 // Set the initial heap size.  This might be ignored by the GC layer.
1015 // This must be called before _Jv_RunMain.
1016 void
1017 _Jv_SetInitialHeapSize (const char *arg)
1018 {
1019   size_t size = parse_heap_size (arg);
1020   _Jv_GCSetInitialHeapSize (size);
1021 }
1022
1023 // Set the maximum heap size.  This might be ignored by the GC layer.
1024 // This must be called before _Jv_RunMain.
1025 void
1026 _Jv_SetMaximumHeapSize (const char *arg)
1027 {
1028   size_t size = parse_heap_size (arg);
1029   _Jv_GCSetMaximumHeapSize (size);
1030 }
1031
1032 \f
1033
1034 void *
1035 _Jv_Malloc (jsize size)
1036 {
1037   if (__builtin_expect (size == 0, false))
1038     size = 1;
1039   void *ptr = malloc ((size_t) size);
1040   if (__builtin_expect (ptr == NULL, false))
1041     throw no_memory;
1042   return ptr;
1043 }
1044
1045 void *
1046 _Jv_Realloc (void *ptr, jsize size)
1047 {
1048   if (__builtin_expect (size == 0, false))
1049     size = 1;
1050   ptr = realloc (ptr, (size_t) size);
1051   if (__builtin_expect (ptr == NULL, false))
1052     throw no_memory;
1053   return ptr;
1054 }
1055
1056 void *
1057 _Jv_MallocUnchecked (jsize size)
1058 {
1059   if (__builtin_expect (size == 0, false))
1060     size = 1;
1061   return malloc ((size_t) size);
1062 }
1063
1064 void
1065 _Jv_Free (void* ptr)
1066 {
1067   return free (ptr);
1068 }
1069
1070 \f
1071
1072 // In theory, these routines can be #ifdef'd away on machines which
1073 // support divide overflow signals.  However, we never know if some
1074 // code might have been compiled with "-fuse-divide-subroutine", so we
1075 // always include them in libgcj.
1076
1077 jint
1078 _Jv_divI (jint dividend, jint divisor)
1079 {
1080   if (__builtin_expect (divisor == 0, false))
1081     {
1082       java::lang::ArithmeticException *arithexception
1083         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1084       throw arithexception;
1085     }
1086
1087   if (dividend == (jint) 0x80000000L && divisor == -1)
1088     return dividend;
1089
1090   return dividend / divisor;
1091 }
1092
1093 jint
1094 _Jv_remI (jint dividend, jint divisor)
1095 {
1096   if (__builtin_expect (divisor == 0, false))
1097     {
1098       java::lang::ArithmeticException *arithexception
1099         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1100       throw arithexception;
1101     }
1102
1103   if (dividend == (jint) 0x80000000L && divisor == -1)
1104     return 0;
1105
1106   return dividend % divisor;
1107 }
1108
1109 jlong
1110 _Jv_divJ (jlong dividend, jlong divisor)
1111 {
1112   if (__builtin_expect (divisor == 0, false))
1113     {
1114       java::lang::ArithmeticException *arithexception
1115         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1116       throw arithexception;
1117     }
1118
1119   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1120     return dividend;
1121
1122   return dividend / divisor;
1123 }
1124
1125 jlong
1126 _Jv_remJ (jlong dividend, jlong divisor)
1127 {
1128   if (__builtin_expect (divisor == 0, false))
1129     {
1130       java::lang::ArithmeticException *arithexception
1131         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1132       throw arithexception;
1133     }
1134
1135   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1136     return 0;
1137
1138   return dividend % divisor;
1139 }
1140
1141 \f
1142
1143 // Return true if SELF_KLASS can access a field or method in
1144 // OTHER_KLASS.  The field or method's access flags are specified in
1145 // FLAGS.
1146 jboolean
1147 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1148 {
1149   using namespace java::lang::reflect;
1150   return ((self_klass == other_klass)
1151           || ((flags & Modifier::PUBLIC) != 0)
1152           || (((flags & Modifier::PROTECTED) != 0)
1153               && other_klass->isAssignableFrom (self_klass))
1154           || (((flags & Modifier::PRIVATE) == 0)
1155               && _Jv_ClassNameSamePackage (self_klass->name,
1156                                            other_klass->name)));
1157 }