libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001  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
  13 #ifdef USE_WIN32_SIGNALLING
  14 #include <windows.h>
  15 #endif /* USE_WIN32_SIGNALLING */
  16
  17 #ifdef USE_WINSOCK
  18 #undef __INSIDE_CYGWIN__
  19 #include <winsock.h>
  20 #endif /* USE_WINSOCK */
  21
  22 #include <stdlib.h>
  23 #include <stdarg.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <signal.h>
  27
  28 #ifdef HAVE_UNISTD_H
  29 #include <unistd.h>
  30 #endif
  31
  32 #include <gcj/cni.h>
  33 #include <jvm.h>
  34 #include <java-signal.h>
  35 #include <java-threads.h>
  36
  37 #ifdef ENABLE_JVMPI
  38 #include <jvmpi.h>
  39 #include <java/lang/ThreadGroup.h>
  40 #endif
  41
  42 #ifndef DISABLE_GETENV_PROPERTIES
  43 #include <ctype.h>
  44 #include <java-props.h>
  45 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  46 #else
  47 #define PROCESS_GCJ_PROPERTIES
  48 #endif // DISABLE_GETENV_PROPERTIES
  49
  50 #include <java/lang/Class.h>
  51 #include <java/lang/ClassLoader.h>
  52 #include <java/lang/Runtime.h>
  53 #include <java/lang/String.h>
  54 #include <java/lang/Thread.h>
  55 #include <java/lang/ThreadGroup.h>
  56 #include <gnu/gcj/runtime/FirstThread.h>
  57 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  58 #include <java/lang/ArithmeticException.h>
  59 #include <java/lang/ClassFormatError.h>
  60 #include <java/lang/NegativeArraySizeException.h>
  61 #include <java/lang/NullPointerException.h>
  62 #include <java/lang/OutOfMemoryError.h>
  63 #include <java/lang/System.h>
  64 #include <java/lang/reflect/Modifier.h>
  65 #include <java/io/PrintStream.h>
  66 #include <java/lang/UnsatisfiedLinkError.h>
  67 #include <gnu/gcj/runtime/VMClassLoader.h>
  68
  69 #ifdef USE_LTDL
  70 #include <ltdl.h>
  71 #endif
  72
  73 // We allocate a single OutOfMemoryError exception which we keep
  74 // around for use if we run out of memory.
  75 static java::lang::OutOfMemoryError *no_memory;
  76
  77 // Largest representable size_t.
  78 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  79
  80 static const char *no_properties[] = { NULL };
  81
  82 // Properties set at compile time.
  83 const char **_Jv_Compiler_Properties = no_properties;
  84
  85 // The JAR file to add to the beginning of java.class.path.
  86 const char *_Jv_Jar_Class_Path;
  87
  88 #ifndef DISABLE_GETENV_PROPERTIES
  89 // Property key/value pairs.
  90 property_pair *_Jv_Environment_Properties;
  91 #endif
  92
  93 // The name of this executable.
  94 static char *_Jv_execName;
  95
  96 // Stash the argv pointer to benefit native libraries that need it.
  97 const char **_Jv_argv;
  98 int _Jv_argc;
  99
 100 #ifdef ENABLE_JVMPI
 101 // Pointer to JVMPI notification functions.
 102 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 103 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 104 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 105 #endif
 106 \f
 107
 108 extern "C" void _Jv_ThrowSignal (jthrowable) __attribute ((noreturn));
 109
 110 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 111 // this is declared extern in order that its name not be mangled, it
 112 // is not intended to be used outside this file.
 113 void
 114 _Jv_ThrowSignal (jthrowable throwable)
 115 {
 116   throwable->fillInStackTrace ();
 117   throw throwable;
 118 }
 119
 120 #ifdef HANDLE_SEGV
 121 static java::lang::NullPointerException *nullp;
 122
 123 SIGNAL_HANDLER (catch_segv)
 124 {
 125   MAKE_THROW_FRAME (nullp);
 126   _Jv_ThrowSignal (nullp);
 127 }
 128 #endif
 129
 130 static java::lang::ArithmeticException *arithexception;
 131
 132 #ifdef HANDLE_FPE
 133 SIGNAL_HANDLER (catch_fpe)
 134 {
 135 #ifdef HANDLE_DIVIDE_OVERFLOW
 136   HANDLE_DIVIDE_OVERFLOW;
 137 #else
 138   MAKE_THROW_FRAME (arithexception);
 139 #endif
 140   _Jv_ThrowSignal (arithexception);
 141 }
 142 #endif
 143
 144 \f
 145
 146 jboolean
 147 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 148 {
 149   int len;
 150   _Jv_ushort *aptr, *bptr;
 151   if (a == b)
 152     return true;
 153   if (a->hash != b->hash)
 154     return false;
 155   len = a->length;
 156   if (b->length != len)
 157     return false;
 158   aptr = (_Jv_ushort *)a->data;
 159   bptr = (_Jv_ushort *)b->data;
 160   len = (len + 1) >> 1;
 161   while (--len >= 0)
 162     if (*aptr++ != *bptr++)
 163       return false;
 164   return true;
 165 }
 166
 167 /* True iff A is equal to STR.
 168    HASH is STR->hashCode().
 169 */
 170
 171 jboolean
 172 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 173 {
 174   if (a->hash != (_Jv_ushort) hash)
 175     return false;
 176   jint len = str->length();
 177   jint i = 0;
 178   jchar *sptr = _Jv_GetStringChars (str);
 179   unsigned char* ptr = (unsigned char*) a->data;
 180   unsigned char* limit = ptr + a->length;
 181   for (;; i++, sptr++)
 182     {
 183       int ch = UTF8_GET (ptr, limit);
 184       if (i == len)
 185         return ch < 0;
 186       if (ch != *sptr)
 187         return false;
 188     }
 189   return true;
 190 }
 191
 192 /* Like _Jv_equal, but stop after N characters.  */
 193 jboolean
 194 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 195 {
 196   jint len = str->length();
 197   jint i = 0;
 198   jchar *sptr = _Jv_GetStringChars (str);
 199   unsigned char* ptr = (unsigned char*) a->data;
 200   unsigned char* limit = ptr + a->length;
 201   for (; n-- > 0; i++, sptr++)
 202     {
 203       int ch = UTF8_GET (ptr, limit);
 204       if (i == len)
 205         return ch < 0;
 206       if (ch != *sptr)
 207         return false;
 208     }
 209   return true;
 210 }
 211
 212 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 213 int
 214 _Jv_strLengthUtf8(char* str, int len)
 215 {
 216   unsigned char* ptr;
 217   unsigned char* limit;
 218   int str_length;
 219
 220   ptr = (unsigned char*) str;
 221   limit = ptr + len;
 222   str_length = 0;
 223   for (; ptr < limit; str_length++)
 224     {
 225       if (UTF8_GET (ptr, limit) < 0)
 226         return (-1);
 227     }
 228   return (str_length);
 229 }
 230
 231 /* Calculate a hash value for a string encoded in Utf8 format.
 232  * This returns the same hash value as specified or java.lang.String.hashCode.
 233  */
 234 static jint
 235 hashUtf8String (char* str, int len)
 236 {
 237   unsigned char* ptr = (unsigned char*) str;
 238   unsigned char* limit = ptr + len;
 239   jint hash = 0;
 240
 241   for (; ptr < limit;)
 242     {
 243       int ch = UTF8_GET (ptr, limit);
 244       /* Updated specification from
 245          http://www.javasoft.com/docs/books/jls/clarify.html. */
 246       hash = (31 * hash) + ch;
 247     }
 248   return hash;
 249 }
 250
 251 _Jv_Utf8Const *
 252 _Jv_makeUtf8Const (char* s, int len)
 253 {
 254   if (len < 0)
 255     len = strlen (s);
 256   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 257   if (! m)
 258     throw no_memory;
 259   memcpy (m->data, s, len);
 260   m->data[len] = 0;
 261   m->length = len;
 262   m->hash = hashUtf8String (s, len) & 0xFFFF;
 263   return (m);
 264 }
 265
 266 _Jv_Utf8Const *
 267 _Jv_makeUtf8Const (jstring string)
 268 {
 269   jint hash = string->hashCode ();
 270   jint len = _Jv_GetStringUTFLength (string);
 271
 272   Utf8Const* m = (Utf8Const*)
 273     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 274
 275   m->hash = hash;
 276   m->length = len;
 277
 278   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 279   m->data[len] = 0;
 280
 281   return m;
 282 }
 283
 284 \f
 285
 286 #ifdef DEBUG
 287 void
 288 _Jv_Abort (const char *function, const char *file, int line,
 289            const char *message)
 290 #else
 291 void
 292 _Jv_Abort (const char *, const char *, int, const char *message)
 293 #endif
 294 {
 295 #ifdef DEBUG
 296   fprintf (stderr,
 297            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 298            message, function, file, line);
 299 #else
 300   java::io::PrintStream *err = java::lang::System::err;
 301   err->print(JvNewStringLatin1 ("libgcj failure: "));
 302   err->println(JvNewStringLatin1 (message));
 303   err->flush();
 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   _Jv_Throw (no_memory);
 338 }
 339
 340 // Allocate a new object of class KLASS.  SIZE is the size of the object
 341 // to allocate.  You might think this is redundant, but it isn't; some
 342 // classes, such as String, aren't of fixed size.
 343 jobject
 344 _Jv_AllocObject (jclass klass, jint size)
 345 {
 346   _Jv_InitClass (klass);
 347
 348   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 349
 350   // If this class has inherited finalize from Object, then don't
 351   // bother registering a finalizer.  We know that finalize() is the
 352   // very first method after the dummy entry.  If this turns out to be
 353   // unreliable, a more robust implementation can be written.  Such an
 354   // implementation would look for Object.finalize in Object's method
 355   // table at startup, and then use that information to find the
 356   // appropriate index in the method vector.
 357   if (klass->vtable->get_finalizer()
 358       != java::lang::Object::class$.vtable->get_finalizer())
 359     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 360
 361 #ifdef ENABLE_JVMPI
 362   // Service JVMPI request.
 363
 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 #endif
 389
 390   return obj;
 391 }
 392
 393 // A version of the above that assumes the object contains no pointers,
 394 // and requires no finalization.  This can't happen if we need pointers
 395 // to locks.
 396 #ifdef JV_HASH_SYNCHRONIZATION
 397 jobject
 398 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 399 {
 400   _Jv_InitClass (klass);
 401
 402   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 403
 404 #ifdef ENABLE_JVMPI
 405   // Service JVMPI request.
 406
 407   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 408     {
 409       JVMPI_Event event;
 410
 411       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 412       event.env_id = NULL;
 413       event.u.obj_alloc.arena_id = 0;
 414       event.u.obj_alloc.class_id = (jobjectID) klass;
 415       event.u.obj_alloc.is_array = 0;
 416       event.u.obj_alloc.size = size;
 417       event.u.obj_alloc.obj_id = (jobjectID) obj;
 418
 419       _Jv_DisableGC ();
 420       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 421       _Jv_EnableGC ();
 422     }
 423 #endif
 424
 425   return obj;
 426 }
 427 #endif /* JV_HASH_SYNCHRONIZATION */
 428
 429
 430 // Allocate a new array of Java objects.  Each object is of type
 431 // `elementClass'.  `init' is used to initialize each slot in the
 432 // array.
 433 jobjectArray
 434 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 435 {
 436   if (__builtin_expect (count < 0, false))
 437     throw new java::lang::NegativeArraySizeException;
 438
 439   JvAssert (! elementClass->isPrimitive ());
 440
 441   // Ensure that elements pointer is properly aligned.
 442   jobjectArray obj = NULL;
 443   size_t size = (size_t) elements (obj);
 444   size += count * sizeof (jobject);
 445
 446   // FIXME: second argument should be "current loader"
 447   jclass klass = _Jv_GetArrayClass (elementClass, 0);
 448
 449   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 450   // Cast away const.
 451   jsize *lp = const_cast<jsize *> (&obj->length);
 452   *lp = count;
 453   // We know the allocator returns zeroed memory.  So don't bother
 454   // zeroing it again.
 455   if (init)
 456     {
 457       jobject *ptr = elements(obj);
 458       while (--count >= 0)
 459         *ptr++ = init;
 460     }
 461   return obj;
 462 }
 463
 464 // Allocate a new array of primitives.  ELTYPE is the type of the
 465 // element, COUNT is the size of the array.
 466 jobject
 467 _Jv_NewPrimArray (jclass eltype, jint count)
 468 {
 469   int elsize = eltype->size();
 470   if (__builtin_expect (count < 0, false))
 471     throw new java::lang::NegativeArraySizeException;
 472
 473   JvAssert (eltype->isPrimitive ());
 474   jobject dummy = NULL;
 475   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 476
 477   // Check for overflow.
 478   if (__builtin_expect ((size_t) count >
 479                         (SIZE_T_MAX - size) / elsize, false))
 480     throw no_memory;
 481
 482   jclass klass = _Jv_GetArrayClass (eltype, 0);
 483
 484 # ifdef JV_HASH_SYNCHRONIZATION
 485   // Since the vtable is always statically allocated,
 486   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 487   __JArray *arr =
 488     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 489   memset((char *)arr + size, 0, elsize * count);
 490 # else
 491   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 492   // Note that we assume we are given zeroed memory by the allocator.
 493 # endif
 494   // Cast away const.
 495   jsize *lp = const_cast<jsize *> (&arr->length);
 496   *lp = count;
 497
 498   return arr;
 499 }
 500
 501 jobject
 502 _Jv_NewArray (jint type, jint size)
 503 {
 504   switch (type)
 505     {
 506       case  4:  return JvNewBooleanArray (size);
 507       case  5:  return JvNewCharArray (size);
 508       case  6:  return JvNewFloatArray (size);
 509       case  7:  return JvNewDoubleArray (size);
 510       case  8:  return JvNewByteArray (size);
 511       case  9:  return JvNewShortArray (size);
 512       case 10:  return JvNewIntArray (size);
 513       case 11:  return JvNewLongArray (size);
 514     }
 515   JvFail ("newarray - bad type code");
 516   return NULL;                  // Placate compiler.
 517 }
 518
 519 jobject
 520 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 521 {
 522   JvAssert (type->isArray());
 523   jclass element_type = type->getComponentType();
 524   jobject result;
 525   if (element_type->isPrimitive())
 526     result = _Jv_NewPrimArray (element_type, sizes[0]);
 527   else
 528     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 529
 530   if (dimensions > 1)
 531     {
 532       JvAssert (! element_type->isPrimitive());
 533       JvAssert (element_type->isArray());
 534       jobject *contents = elements ((jobjectArray) result);
 535       for (int i = 0; i < sizes[0]; ++i)
 536         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 537                                          sizes + 1);
 538     }
 539
 540   return result;
 541 }
 542
 543 jobject
 544 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 545 {
 546   va_list args;
 547   jint sizes[dimensions];
 548   va_start (args, dimensions);
 549   for (int i = 0; i < dimensions; ++i)
 550     {
 551       jint size = va_arg (args, jint);
 552       sizes[i] = size;
 553     }
 554   va_end (args);
 555
 556   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 557 }
 558
 559 \f
 560
 561 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN)                               \
 562   _Jv_ArrayVTable _Jv_##NAME##VTable;                                   \
 563   java::lang::Class _Jv_##NAME##Class ((jobject) #NAME,                 \
 564                                        (jbyte) SIG, (jint) LEN,         \
 565                                        (jobject) &_Jv_##NAME##VTable);
 566
 567 DECLARE_PRIM_TYPE(byte, 'B', 1);
 568 DECLARE_PRIM_TYPE(short, 'S', 2);
 569 DECLARE_PRIM_TYPE(int, 'I', 4);
 570 DECLARE_PRIM_TYPE(long, 'J', 8);
 571 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 572 DECLARE_PRIM_TYPE(char, 'C', 2);
 573 DECLARE_PRIM_TYPE(float, 'F', 4);
 574 DECLARE_PRIM_TYPE(double, 'D', 8);
 575 DECLARE_PRIM_TYPE(void, 'V', 0);
 576
 577 jclass
 578 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 579 {
 580   switch (*sig)
 581     {
 582     case 'B':
 583       return JvPrimClass (byte);
 584     case 'S':
 585       return JvPrimClass (short);
 586     case 'I':
 587       return JvPrimClass (int);
 588     case 'J':
 589       return JvPrimClass (long);
 590     case 'Z':
 591       return JvPrimClass (boolean);
 592     case 'C':
 593       return JvPrimClass (char);
 594     case 'F':
 595       return JvPrimClass (float);
 596     case 'D':
 597       return JvPrimClass (double);
 598     case 'V':
 599       return JvPrimClass (void);
 600     case 'L':
 601       {
 602         int i;
 603         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 604           ;
 605         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 606         return _Jv_FindClass (name, loader);
 607
 608       }
 609     case '[':
 610       {
 611         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 612         if (! klass)
 613           return NULL;
 614         return _Jv_GetArrayClass (klass, loader);
 615       }
 616     }
 617
 618   return NULL;                  // Placate compiler.
 619 }
 620
 621 \f
 622
 623 JArray<jstring> *
 624 JvConvertArgv (int argc, const char **argv)
 625 {
 626   if (argc < 0)
 627     argc = 0;
 628   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 629   jobject* ptr = elements(ar);
 630   for (int i = 0;  i < argc;  i++)
 631     {
 632       const char *arg = argv[i];
 633       // FIXME - should probably use JvNewStringUTF.
 634       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 635     }
 636   return (JArray<jstring>*) ar;
 637 }
 638
 639 // FIXME: These variables are static so that they will be
 640 // automatically scanned by the Boehm collector.  This is needed
 641 // because with qthreads the collector won't scan the initial stack --
 642 // it will only scan the qthreads stacks.
 643
 644 // Command line arguments.
 645 static JArray<jstring> *arg_vec;
 646
 647 // The primary thread.
 648 static java::lang::Thread *main_thread;
 649
 650 char *
 651 _Jv_ThisExecutable (void)
 652 {
 653   return _Jv_execName;
 654 }
 655
 656 void
 657 _Jv_ThisExecutable (const char *name)
 658 {
 659   if (name)
 660     {
 661       _Jv_execName = (char *) _Jv_Malloc (strlen (name) + 1);
 662       strcpy (_Jv_execName, name);
 663     }
 664 }
 665
 666 #ifdef USE_WIN32_SIGNALLING
 667
 668 extern "C" int* win32_get_restart_frame (void *);
 669
 670 LONG CALLBACK
 671 win32_exception_handler (LPEXCEPTION_POINTERS e)
 672 {
 673   int* setjmp_buf;
 674   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 675     setjmp_buf = win32_get_restart_frame (nullp);
 676   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 677     setjmp_buf = win32_get_restart_frame (arithexception);
 678   else
 679     return EXCEPTION_CONTINUE_SEARCH;
 680
 681   e->ContextRecord->Ebp = setjmp_buf[0];
 682   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 683   e->ContextRecord->Eip = setjmp_buf[1];
 684   // FIXME: Is this the stack pointer? Do we need it?
 685   e->ContextRecord->Esp = setjmp_buf[2];
 686
 687   return EXCEPTION_CONTINUE_EXECUTION;
 688 }
 689
 690 #endif
 691
 692 #ifndef DISABLE_GETENV_PROPERTIES
 693
 694 static char *
 695 next_property_key (char *s, size_t *length)
 696 {
 697   size_t l = 0;
 698
 699   JvAssert (s);
 700
 701   // Skip over whitespace
 702   while (isspace (*s))
 703     s++;
 704
 705   // If we've reached the end, return NULL.  Also return NULL if for
 706   // some reason we've come across a malformed property string.
 707   if (*s == 0
 708       || *s == ':'
 709       || *s == '=')
 710     return NULL;
 711
 712   // Determine the length of the property key.
 713   while (s[l] != 0
 714          && ! isspace (s[l])
 715          && s[l] != ':'
 716          && s[l] != '=')
 717     {
 718       if (s[l] == '\\'
 719           && s[l+1] != 0)
 720         l++;
 721       l++;
 722     }
 723
 724   *length = l;
 725
 726   return s;
 727 }
 728
 729 static char *
 730 next_property_value (char *s, size_t *length)
 731 {
 732   size_t l = 0;
 733
 734   JvAssert (s);
 735
 736   while (isspace (*s))
 737     s++;
 738
 739   if (*s == ':'
 740       || *s == '=')
 741     s++;
 742
 743   while (isspace (*s))
 744     s++;
 745
 746   // If we've reached the end, return NULL.
 747   if (*s == 0)
 748     return NULL;
 749
 750   // Determine the length of the property value.
 751   while (s[l] != 0
 752          && ! isspace (s[l])
 753          && s[l] != ':'
 754          && s[l] != '=')
 755     {
 756       if (s[l] == '\\'
 757           && s[l+1] != 0)
 758         l += 2;
 759       else
 760         l++;
 761     }
 762
 763   *length = l;
 764
 765   return s;
 766 }
 767
 768 static void
 769 process_gcj_properties ()
 770 {
 771   char *props = getenv("GCJ_PROPERTIES");
 772   char *p = props;
 773   size_t length;
 774   size_t property_count = 0;
 775
 776   if (NULL == props)
 777     return;
 778
 779   // Whip through props quickly in order to count the number of
 780   // property values.
 781   while (p && (p = next_property_key (p, &length)))
 782     {
 783       // Skip to the end of the key
 784       p += length;
 785
 786       p = next_property_value (p, &length);
 787       if (p)
 788         p += length;
 789
 790       property_count++;
 791     }
 792
 793   // Allocate an array of property value/key pairs.
 794   _Jv_Environment_Properties =
 795     (property_pair *) malloc (sizeof(property_pair)
 796                               * (property_count + 1));
 797
 798   // Go through the properties again, initializing _Jv_Properties
 799   // along the way.
 800   p = props;
 801   property_count = 0;
 802   while (p && (p = next_property_key (p, &length)))
 803     {
 804       _Jv_Environment_Properties[property_count].key = p;
 805       _Jv_Environment_Properties[property_count].key_length = length;
 806
 807       // Skip to the end of the key
 808       p += length;
 809
 810       p = next_property_value (p, &length);
 811
 812       _Jv_Environment_Properties[property_count].value = p;
 813       _Jv_Environment_Properties[property_count].value_length = length;
 814
 815       if (p)
 816         p += length;
 817
 818       property_count++;
 819     }
 820   memset ((void *) &_Jv_Environment_Properties[property_count],
 821           0, sizeof (property_pair));
 822   {
 823     size_t i = 0;
 824
 825     // Null terminate the strings.
 826     while (_Jv_Environment_Properties[i].key)
 827       {
 828         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 829         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 830       }
 831   }
 832 }
 833 #endif // DISABLE_GETENV_PROPERTIES
 834
 835 jint
 836 _Jv_CreateJavaVM (void* /*vm_args*/)
 837 {
 838   PROCESS_GCJ_PROPERTIES;
 839
 840   // Turn stack trace generation off while creating exception objects.
 841   _Jv_InitClass (&java::lang::Throwable::class$);
 842   java::lang::Throwable::trace_enabled = 0;
 843
 844   INIT_SEGV;
 845 #ifdef HANDLE_FPE
 846   INIT_FPE;
 847 #else
 848   arithexception = new java::lang::ArithmeticException
 849     (JvNewStringLatin1 ("/ by zero"));
 850 #endif
 851
 852   no_memory = new java::lang::OutOfMemoryError;
 853
 854   java::lang::Throwable::trace_enabled = 1;
 855
 856 #ifdef USE_LTDL
 857   LTDL_SET_PRELOADED_SYMBOLS ();
 858 #endif
 859
 860 #ifdef USE_WINSOCK
 861   // Initialise winsock for networking
 862   WSADATA data;
 863   if (WSAStartup (MAKEWORD (1, 1), &data))
 864       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 865 #endif /* USE_WINSOCK */
 866
 867 #ifdef USE_WIN32_SIGNALLING
 868   // Install exception handler
 869   SetUnhandledExceptionFilter (win32_exception_handler);
 870 #elif defined(HAVE_SIGACTION)
 871   // We only want this on POSIX systems.
 872   struct sigaction act;
 873   act.sa_handler = SIG_IGN;
 874   sigemptyset (&act.sa_mask);
 875   act.sa_flags = 0;
 876   sigaction (SIGPIPE, &act, NULL);
 877 #else
 878   signal (SIGPIPE, SIG_IGN);
 879 #endif
 880
 881   _Jv_JNI_Init ();
 882
 883   return 0;
 884 }
 885
 886 void
 887 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 888              bool is_jar)
 889 {
 890   _Jv_argv = argv;
 891   _Jv_argc = argc;
 892
 893   java::lang::Runtime *runtime = NULL;
 894
 895 #ifdef HAVE_PROC_SELF_EXE
 896   char exec_name[20];
 897   sprintf (exec_name, "/proc/%d/exe", getpid ());
 898   _Jv_ThisExecutable (exec_name);
 899 #else
 900   _Jv_ThisExecutable (argv[0]);
 901 #endif
 902
 903   try
 904     {
 905       _Jv_CreateJavaVM (NULL);
 906
 907       // Get the Runtime here.  We want to initialize it before searching
 908       // for `main'; that way it will be set up if `main' is a JNI method.
 909       runtime = java::lang::Runtime::getRuntime ();
 910
 911       arg_vec = JvConvertArgv (argc - 1, argv + 1);
 912
 913       if (klass)
 914         main_thread = new gnu::gcj::runtime::FirstThread (klass, arg_vec);
 915       else
 916         main_thread = new gnu::gcj::runtime::FirstThread
 917                         (JvNewStringLatin1 (name), arg_vec, is_jar);
 918
 919       if (is_jar)
 920         {
 921           // We need a new ClassLoader because the classpath must be the
 922           // jar file only.  The easiest way to do this is to lose our
 923           // reference to the previous classloader.
 924           _Jv_Jar_Class_Path = strdup (name);
 925           gnu::gcj::runtime::VMClassLoader::instance = NULL;
 926         }
 927     }
 928   catch (java::lang::Throwable *t)
 929     {
 930       java::lang::System::err->println (JvNewStringLatin1
 931         ("Exception during runtime initialization"));
 932       t->printStackTrace();
 933       runtime->exit (1);
 934     }
 935
 936   _Jv_AttachCurrentThread (main_thread);
 937   _Jv_ThreadRun (main_thread);
 938   _Jv_ThreadWait ();
 939
 940   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 941   runtime->exit (status);
 942 }
 943
 944 void
 945 JvRunMain (jclass klass, int argc, const char **argv)
 946 {
 947   _Jv_RunMain (klass, NULL, argc, argv, false);
 948 }
 949
 950 \f
 951
 952 // Parse a string and return a heap size.
 953 static size_t
 954 parse_heap_size (const char *spec)
 955 {
 956   char *end;
 957   unsigned long val = strtoul (spec, &end, 10);
 958   if (*end == 'k' || *end == 'K')
 959     val *= 1024;
 960   else if (*end == 'm' || *end == 'M')
 961     val *= 1048576;
 962   return (size_t) val;
 963 }
 964
 965 // Set the initial heap size.  This might be ignored by the GC layer.
 966 // This must be called before _Jv_RunMain.
 967 void
 968 _Jv_SetInitialHeapSize (const char *arg)
 969 {
 970   size_t size = parse_heap_size (arg);
 971   _Jv_GCSetInitialHeapSize (size);
 972 }
 973
 974 // Set the maximum heap size.  This might be ignored by the GC layer.
 975 // This must be called before _Jv_RunMain.
 976 void
 977 _Jv_SetMaximumHeapSize (const char *arg)
 978 {
 979   size_t size = parse_heap_size (arg);
 980   _Jv_GCSetMaximumHeapSize (size);
 981 }
 982
 983 \f
 984
 985 void *
 986 _Jv_Malloc (jsize size)
 987 {
 988   if (__builtin_expect (size == 0, false))
 989     size = 1;
 990   void *ptr = malloc ((size_t) size);
 991   if (__builtin_expect (ptr == NULL, false))
 992     throw no_memory;
 993   return ptr;
 994 }
 995
 996 void *
 997 _Jv_Realloc (void *ptr, jsize size)
 998 {
 999   if (__builtin_expect (size == 0, false))
1000     size = 1;
1001   ptr = realloc (ptr, (size_t) size);
1002   if (__builtin_expect (ptr == NULL, false))
1003     throw no_memory;
1004   return ptr;
1005 }
1006
1007 void *
1008 _Jv_MallocUnchecked (jsize size)
1009 {
1010   if (__builtin_expect (size == 0, false))
1011     size = 1;
1012   return malloc ((size_t) size);
1013 }
1014
1015 void
1016 _Jv_Free (void* ptr)
1017 {
1018   return free (ptr);
1019 }
1020
1021 \f
1022
1023 // In theory, these routines can be #ifdef'd away on machines which
1024 // support divide overflow signals.  However, we never know if some
1025 // code might have been compiled with "-fuse-divide-subroutine", so we
1026 // always include them in libgcj.
1027
1028 jint
1029 _Jv_divI (jint dividend, jint divisor)
1030 {
1031   if (__builtin_expect (divisor == 0, false))
1032     _Jv_ThrowSignal (arithexception);
1033
1034   if (dividend == (jint) 0x80000000L && divisor == -1)
1035     return dividend;
1036
1037   return dividend / divisor;
1038 }
1039
1040 jint
1041 _Jv_remI (jint dividend, jint divisor)
1042 {
1043   if (__builtin_expect (divisor == 0, false))
1044     _Jv_ThrowSignal (arithexception);
1045
1046   if (dividend == (jint) 0x80000000L && divisor == -1)
1047     return 0;
1048
1049   return dividend % divisor;
1050 }
1051
1052 jlong
1053 _Jv_divJ (jlong dividend, jlong divisor)
1054 {
1055   if (__builtin_expect (divisor == 0, false))
1056     _Jv_ThrowSignal (arithexception);
1057
1058   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1059     return dividend;
1060
1061   return dividend / divisor;
1062 }
1063
1064 jlong
1065 _Jv_remJ (jlong dividend, jlong divisor)
1066 {
1067   if (__builtin_expect (divisor == 0, false))
1068     _Jv_ThrowSignal (arithexception);
1069
1070   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1071     return 0;
1072
1073   return dividend % divisor;
1074 }