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
  68 #ifdef USE_LTDL
  69 #include <ltdl.h>
  70 #endif
  71
  72 // We allocate a single OutOfMemoryError exception which we keep
  73 // around for use if we run out of memory.
  74 static java::lang::OutOfMemoryError *no_memory;
  75
  76 // Largest representable size_t.
  77 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  78
  79 static const char *no_properties[] = { NULL };
  80
  81 // Properties set at compile time.
  82 const char **_Jv_Compiler_Properties = no_properties;
  83
  84 // The JAR file to add to the beginning of java.class.path.
  85 const char *_Jv_Jar_Class_Path;
  86
  87 #ifndef DISABLE_GETENV_PROPERTIES
  88 // Property key/value pairs.
  89 property_pair *_Jv_Environment_Properties;
  90 #endif
  91
  92 // The name of this executable.
  93 static char *_Jv_execName;
  94
  95 // Stash the argv pointer to benefit native libraries that need it.
  96 const char **_Jv_argv;
  97 int _Jv_argc;
  98
  99 #ifdef ENABLE_JVMPI
 100 // Pointer to JVMPI notification functions.
 101 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 102 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 103 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 104 #endif
 105 \f
 106
 107 extern "C" void _Jv_ThrowSignal (jthrowable) __attribute ((noreturn));
 108
 109 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 110 // this is declared extern in order that its name not be mangled, it
 111 // is not intended to be used outside this file.
 112 void
 113 _Jv_ThrowSignal (jthrowable throwable)
 114 {
 115   throwable->fillInStackTrace ();
 116   throw throwable;
 117 }
 118
 119 #ifdef HANDLE_SEGV
 120 static java::lang::NullPointerException *nullp;
 121
 122 SIGNAL_HANDLER (catch_segv)
 123 {
 124   MAKE_THROW_FRAME (nullp);
 125   _Jv_ThrowSignal (nullp);
 126 }
 127 #endif
 128
 129 static java::lang::ArithmeticException *arithexception;
 130
 131 #ifdef HANDLE_FPE
 132 SIGNAL_HANDLER (catch_fpe)
 133 {
 134 #ifdef HANDLE_DIVIDE_OVERFLOW
 135   HANDLE_DIVIDE_OVERFLOW;
 136 #else
 137   MAKE_THROW_FRAME (arithexception);
 138 #endif
 139   _Jv_ThrowSignal (arithexception);
 140 }
 141 #endif
 142
 143 \f
 144
 145 jboolean
 146 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 147 {
 148   int len;
 149   _Jv_ushort *aptr, *bptr;
 150   if (a == b)
 151     return true;
 152   if (a->hash != b->hash)
 153     return false;
 154   len = a->length;
 155   if (b->length != len)
 156     return false;
 157   aptr = (_Jv_ushort *)a->data;
 158   bptr = (_Jv_ushort *)b->data;
 159   len = (len + 1) >> 1;
 160   while (--len >= 0)
 161     if (*aptr++ != *bptr++)
 162       return false;
 163   return true;
 164 }
 165
 166 /* True iff A is equal to STR.
 167    HASH is STR->hashCode().
 168 */
 169
 170 jboolean
 171 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 172 {
 173   if (a->hash != (_Jv_ushort) hash)
 174     return false;
 175   jint len = str->length();
 176   jint i = 0;
 177   jchar *sptr = _Jv_GetStringChars (str);
 178   unsigned char* ptr = (unsigned char*) a->data;
 179   unsigned char* limit = ptr + a->length;
 180   for (;; i++, sptr++)
 181     {
 182       int ch = UTF8_GET (ptr, limit);
 183       if (i == len)
 184         return ch < 0;
 185       if (ch != *sptr)
 186         return false;
 187     }
 188   return true;
 189 }
 190
 191 /* Like _Jv_equal, but stop after N characters.  */
 192 jboolean
 193 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 194 {
 195   jint len = str->length();
 196   jint i = 0;
 197   jchar *sptr = _Jv_GetStringChars (str);
 198   unsigned char* ptr = (unsigned char*) a->data;
 199   unsigned char* limit = ptr + a->length;
 200   for (; n-- > 0; i++, sptr++)
 201     {
 202       int ch = UTF8_GET (ptr, limit);
 203       if (i == len)
 204         return ch < 0;
 205       if (ch != *sptr)
 206         return false;
 207     }
 208   return true;
 209 }
 210
 211 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 212 int
 213 _Jv_strLengthUtf8(char* str, int len)
 214 {
 215   unsigned char* ptr;
 216   unsigned char* limit;
 217   int str_length;
 218
 219   ptr = (unsigned char*) str;
 220   limit = ptr + len;
 221   str_length = 0;
 222   for (; ptr < limit; str_length++)
 223     {
 224       if (UTF8_GET (ptr, limit) < 0)
 225         return (-1);
 226     }
 227   return (str_length);
 228 }
 229
 230 /* Calculate a hash value for a string encoded in Utf8 format.
 231  * This returns the same hash value as specified or java.lang.String.hashCode.
 232  */
 233 static jint
 234 hashUtf8String (char* str, int len)
 235 {
 236   unsigned char* ptr = (unsigned char*) str;
 237   unsigned char* limit = ptr + len;
 238   jint hash = 0;
 239
 240   for (; ptr < limit;)
 241     {
 242       int ch = UTF8_GET (ptr, limit);
 243       /* Updated specification from
 244          http://www.javasoft.com/docs/books/jls/clarify.html. */
 245       hash = (31 * hash) + ch;
 246     }
 247   return hash;
 248 }
 249
 250 _Jv_Utf8Const *
 251 _Jv_makeUtf8Const (char* s, int len)
 252 {
 253   if (len < 0)
 254     len = strlen (s);
 255   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 256   if (! m)
 257     throw no_memory;
 258   memcpy (m->data, s, len);
 259   m->data[len] = 0;
 260   m->length = len;
 261   m->hash = hashUtf8String (s, len) & 0xFFFF;
 262   return (m);
 263 }
 264
 265 _Jv_Utf8Const *
 266 _Jv_makeUtf8Const (jstring string)
 267 {
 268   jint hash = string->hashCode ();
 269   jint len = _Jv_GetStringUTFLength (string);
 270
 271   Utf8Const* m = (Utf8Const*)
 272     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 273
 274   m->hash = hash;
 275   m->length = len;
 276
 277   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 278   m->data[len] = 0;
 279
 280   return m;
 281 }
 282
 283 \f
 284
 285 #ifdef DEBUG
 286 void
 287 _Jv_Abort (const char *function, const char *file, int line,
 288            const char *message)
 289 #else
 290 void
 291 _Jv_Abort (const char *, const char *, int, const char *message)
 292 #endif
 293 {
 294 #ifdef DEBUG
 295   fprintf (stderr,
 296            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 297            message, function, file, line);
 298 #else
 299   java::io::PrintStream *err = java::lang::System::err;
 300   err->print(JvNewStringLatin1 ("libgcj failure: "));
 301   err->println(JvNewStringLatin1 (message));
 302   err->flush();
 303 #endif
 304   abort ();
 305 }
 306
 307 static void
 308 fail_on_finalization (jobject)
 309 {
 310   JvFail ("object was finalized");
 311 }
 312
 313 void
 314 _Jv_GCWatch (jobject obj)
 315 {
 316   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 317 }
 318
 319 void
 320 _Jv_ThrowBadArrayIndex(jint bad_index)
 321 {
 322   throw new java::lang::ArrayIndexOutOfBoundsException
 323     (java::lang::String::valueOf (bad_index));
 324 }
 325
 326 void
 327 _Jv_ThrowNullPointerException ()
 328 {
 329   throw new java::lang::NullPointerException;
 330 }
 331
 332 // Explicitly throw a no memory exception.
 333 // The collector calls this when it encounters an out-of-memory condition.
 334 void _Jv_ThrowNoMemory()
 335 {
 336   _Jv_Throw (no_memory);
 337 }
 338
 339 // Allocate a new object of class KLASS.  SIZE is the size of the object
 340 // to allocate.  You might think this is redundant, but it isn't; some
 341 // classes, such as String, aren't of fixed size.
 342 jobject
 343 _Jv_AllocObject (jclass klass, jint size)
 344 {
 345   _Jv_InitClass (klass);
 346
 347   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 348
 349   // If this class has inherited finalize from Object, then don't
 350   // bother registering a finalizer.  We know that finalize() is the
 351   // very first method after the dummy entry.  If this turns out to be
 352   // unreliable, a more robust implementation can be written.  Such an
 353   // implementation would look for Object.finalize in Object's method
 354   // table at startup, and then use that information to find the
 355   // appropriate index in the method vector.
 356   if (klass->vtable->get_finalizer()
 357       != java::lang::Object::class$.vtable->get_finalizer())
 358     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 359
 360 #ifdef ENABLE_JVMPI
 361   // Service JVMPI request.
 362
 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 #endif
 388
 389   return obj;
 390 }
 391
 392 // A version of the above that assumes the object contains no pointers,
 393 // and requires no finalization.  This can't happen if we need pointers
 394 // to locks.
 395 #ifdef JV_HASH_SYNCHRONIZATION
 396 jobject
 397 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 398 {
 399   _Jv_InitClass (klass);
 400
 401   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 402
 403 #ifdef ENABLE_JVMPI
 404   // Service JVMPI request.
 405
 406   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 407     {
 408       JVMPI_Event event;
 409
 410       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 411       event.env_id = NULL;
 412       event.u.obj_alloc.arena_id = 0;
 413       event.u.obj_alloc.class_id = (jobjectID) klass;
 414       event.u.obj_alloc.is_array = 0;
 415       event.u.obj_alloc.size = size;
 416       event.u.obj_alloc.obj_id = (jobjectID) obj;
 417
 418       _Jv_DisableGC ();
 419       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 420       _Jv_EnableGC ();
 421     }
 422 #endif
 423
 424   return obj;
 425 }
 426 #endif /* JV_HASH_SYNCHRONIZATION */
 427
 428
 429 // Allocate a new array of Java objects.  Each object is of type
 430 // `elementClass'.  `init' is used to initialize each slot in the
 431 // array.
 432 jobjectArray
 433 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 434 {
 435   if (__builtin_expect (count < 0, false))
 436     throw new java::lang::NegativeArraySizeException;
 437
 438   JvAssert (! elementClass->isPrimitive ());
 439
 440   // Ensure that elements pointer is properly aligned.
 441   jobjectArray obj = NULL;
 442   size_t size = (size_t) elements (obj);
 443   size += count * sizeof (jobject);
 444
 445   // FIXME: second argument should be "current loader"
 446   jclass klass = _Jv_GetArrayClass (elementClass, 0);
 447
 448   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 449   // Cast away const.
 450   jsize *lp = const_cast<jsize *> (&obj->length);
 451   *lp = count;
 452   // We know the allocator returns zeroed memory.  So don't bother
 453   // zeroing it again.
 454   if (init)
 455     {
 456       jobject *ptr = elements(obj);
 457       while (--count >= 0)
 458         *ptr++ = init;
 459     }
 460   return obj;
 461 }
 462
 463 // Allocate a new array of primitives.  ELTYPE is the type of the
 464 // element, COUNT is the size of the array.
 465 jobject
 466 _Jv_NewPrimArray (jclass eltype, jint count)
 467 {
 468   int elsize = eltype->size();
 469   if (__builtin_expect (count < 0, false))
 470     throw new java::lang::NegativeArraySizeException;
 471
 472   JvAssert (eltype->isPrimitive ());
 473   jobject dummy = NULL;
 474   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 475
 476   // Check for overflow.
 477   if (__builtin_expect ((size_t) count >
 478                         (SIZE_T_MAX - size) / elsize, false))
 479     throw no_memory;
 480
 481   jclass klass = _Jv_GetArrayClass (eltype, 0);
 482
 483 # ifdef JV_HASH_SYNCHRONIZATION
 484   // Since the vtable is always statically allocated,
 485   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 486   __JArray *arr =
 487     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 488   memset((char *)arr + size, 0, elsize * count);
 489 # else
 490   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 491   // Note that we assume we are given zeroed memory by the allocator.
 492 # endif
 493   // Cast away const.
 494   jsize *lp = const_cast<jsize *> (&arr->length);
 495   *lp = count;
 496
 497   return arr;
 498 }
 499
 500 jobject
 501 _Jv_NewArray (jint type, jint size)
 502 {
 503   switch (type)
 504     {
 505       case  4:  return JvNewBooleanArray (size);
 506       case  5:  return JvNewCharArray (size);
 507       case  6:  return JvNewFloatArray (size);
 508       case  7:  return JvNewDoubleArray (size);
 509       case  8:  return JvNewByteArray (size);
 510       case  9:  return JvNewShortArray (size);
 511       case 10:  return JvNewIntArray (size);
 512       case 11:  return JvNewLongArray (size);
 513     }
 514   JvFail ("newarray - bad type code");
 515   return NULL;                  // Placate compiler.
 516 }
 517
 518 jobject
 519 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 520 {
 521   JvAssert (type->isArray());
 522   jclass element_type = type->getComponentType();
 523   jobject result;
 524   if (element_type->isPrimitive())
 525     result = _Jv_NewPrimArray (element_type, sizes[0]);
 526   else
 527     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 528
 529   if (dimensions > 1)
 530     {
 531       JvAssert (! element_type->isPrimitive());
 532       JvAssert (element_type->isArray());
 533       jobject *contents = elements ((jobjectArray) result);
 534       for (int i = 0; i < sizes[0]; ++i)
 535         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 536                                          sizes + 1);
 537     }
 538
 539   return result;
 540 }
 541
 542 jobject
 543 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 544 {
 545   va_list args;
 546   jint sizes[dimensions];
 547   va_start (args, dimensions);
 548   for (int i = 0; i < dimensions; ++i)
 549     {
 550       jint size = va_arg (args, jint);
 551       sizes[i] = size;
 552     }
 553   va_end (args);
 554
 555   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 556 }
 557
 558 \f
 559
 560 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN)                               \
 561   _Jv_ArrayVTable _Jv_##NAME##VTable;                                   \
 562   java::lang::Class _Jv_##NAME##Class ((jobject) #NAME,                 \
 563                                        (jbyte) SIG, (jint) LEN,         \
 564                                        (jobject) &_Jv_##NAME##VTable);
 565
 566 DECLARE_PRIM_TYPE(byte, 'B', 1);
 567 DECLARE_PRIM_TYPE(short, 'S', 2);
 568 DECLARE_PRIM_TYPE(int, 'I', 4);
 569 DECLARE_PRIM_TYPE(long, 'J', 8);
 570 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 571 DECLARE_PRIM_TYPE(char, 'C', 2);
 572 DECLARE_PRIM_TYPE(float, 'F', 4);
 573 DECLARE_PRIM_TYPE(double, 'D', 8);
 574 DECLARE_PRIM_TYPE(void, 'V', 0);
 575
 576 jclass
 577 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 578 {
 579   switch (*sig)
 580     {
 581     case 'B':
 582       return JvPrimClass (byte);
 583     case 'S':
 584       return JvPrimClass (short);
 585     case 'I':
 586       return JvPrimClass (int);
 587     case 'J':
 588       return JvPrimClass (long);
 589     case 'Z':
 590       return JvPrimClass (boolean);
 591     case 'C':
 592       return JvPrimClass (char);
 593     case 'F':
 594       return JvPrimClass (float);
 595     case 'D':
 596       return JvPrimClass (double);
 597     case 'V':
 598       return JvPrimClass (void);
 599     case 'L':
 600       {
 601         int i;
 602         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 603           ;
 604         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 605         return _Jv_FindClass (name, loader);
 606
 607       }
 608     case '[':
 609       {
 610         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 611         if (! klass)
 612           return NULL;
 613         return _Jv_GetArrayClass (klass, loader);
 614       }
 615     }
 616
 617   return NULL;                  // Placate compiler.
 618 }
 619
 620 \f
 621
 622 JArray<jstring> *
 623 JvConvertArgv (int argc, const char **argv)
 624 {
 625   if (argc < 0)
 626     argc = 0;
 627   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 628   jobject* ptr = elements(ar);
 629   for (int i = 0;  i < argc;  i++)
 630     {
 631       const char *arg = argv[i];
 632       // FIXME - should probably use JvNewStringUTF.
 633       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 634     }
 635   return (JArray<jstring>*) ar;
 636 }
 637
 638 // FIXME: These variables are static so that they will be
 639 // automatically scanned by the Boehm collector.  This is needed
 640 // because with qthreads the collector won't scan the initial stack --
 641 // it will only scan the qthreads stacks.
 642
 643 // Command line arguments.
 644 static JArray<jstring> *arg_vec;
 645
 646 // The primary thread.
 647 static java::lang::Thread *main_thread;
 648
 649 char *
 650 _Jv_ThisExecutable (void)
 651 {
 652   return _Jv_execName;
 653 }
 654
 655 void
 656 _Jv_ThisExecutable (const char *name)
 657 {
 658   if (name)
 659     {
 660       _Jv_execName = (char *) _Jv_Malloc (strlen (name) + 1);
 661       strcpy (_Jv_execName, name);
 662     }
 663 }
 664
 665 #ifdef USE_WIN32_SIGNALLING
 666
 667 extern "C" int* win32_get_restart_frame (void *);
 668
 669 LONG CALLBACK
 670 win32_exception_handler (LPEXCEPTION_POINTERS e)
 671 {
 672   int* setjmp_buf;
 673   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 674     setjmp_buf = win32_get_restart_frame (nullp);
 675   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 676     setjmp_buf = win32_get_restart_frame (arithexception);
 677   else
 678     return EXCEPTION_CONTINUE_SEARCH;
 679
 680   e->ContextRecord->Ebp = setjmp_buf[0];
 681   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 682   e->ContextRecord->Eip = setjmp_buf[1];
 683   // FIXME: Is this the stack pointer? Do we need it?
 684   e->ContextRecord->Esp = setjmp_buf[2];
 685
 686   return EXCEPTION_CONTINUE_EXECUTION;
 687 }
 688
 689 #endif
 690
 691 #ifndef DISABLE_GETENV_PROPERTIES
 692
 693 static char *
 694 next_property_key (char *s, size_t *length)
 695 {
 696   size_t l = 0;
 697
 698   JvAssert (s);
 699
 700   // Skip over whitespace
 701   while (isspace (*s))
 702     s++;
 703
 704   // If we've reached the end, return NULL.  Also return NULL if for
 705   // some reason we've come across a malformed property string.
 706   if (*s == 0
 707       || *s == ':'
 708       || *s == '=')
 709     return NULL;
 710
 711   // Determine the length of the property key.
 712   while (s[l] != 0
 713          && ! isspace (s[l])
 714          && s[l] != ':'
 715          && s[l] != '=')
 716     {
 717       if (s[l] == '\\'
 718           && s[l+1] != 0)
 719         l++;
 720       l++;
 721     }
 722
 723   *length = l;
 724
 725   return s;
 726 }
 727
 728 static char *
 729 next_property_value (char *s, size_t *length)
 730 {
 731   size_t l = 0;
 732
 733   JvAssert (s);
 734
 735   while (isspace (*s))
 736     s++;
 737
 738   if (*s == ':'
 739       || *s == '=')
 740     s++;
 741
 742   while (isspace (*s))
 743     s++;
 744
 745   // If we've reached the end, return NULL.
 746   if (*s == 0)
 747     return NULL;
 748
 749   // Determine the length of the property value.
 750   while (s[l] != 0
 751          && ! isspace (s[l])
 752          && s[l] != ':'
 753          && s[l] != '=')
 754     {
 755       if (s[l] == '\\'
 756           && s[l+1] != 0)
 757         l += 2;
 758       else
 759         l++;
 760     }
 761
 762   *length = l;
 763
 764   return s;
 765 }
 766
 767 static void
 768 process_gcj_properties ()
 769 {
 770   char *props = getenv("GCJ_PROPERTIES");
 771   char *p = props;
 772   size_t length;
 773   size_t property_count = 0;
 774
 775   if (NULL == props)
 776     return;
 777
 778   // Whip through props quickly in order to count the number of
 779   // property values.
 780   while (p && (p = next_property_key (p, &length)))
 781     {
 782       // Skip to the end of the key
 783       p += length;
 784
 785       p = next_property_value (p, &length);
 786       if (p)
 787         p += length;
 788
 789       property_count++;
 790     }
 791
 792   // Allocate an array of property value/key pairs.
 793   _Jv_Environment_Properties =
 794     (property_pair *) malloc (sizeof(property_pair)
 795                               * (property_count + 1));
 796
 797   // Go through the properties again, initializing _Jv_Properties
 798   // along the way.
 799   p = props;
 800   property_count = 0;
 801   while (p && (p = next_property_key (p, &length)))
 802     {
 803       _Jv_Environment_Properties[property_count].key = p;
 804       _Jv_Environment_Properties[property_count].key_length = length;
 805
 806       // Skip to the end of the key
 807       p += length;
 808
 809       p = next_property_value (p, &length);
 810
 811       _Jv_Environment_Properties[property_count].value = p;
 812       _Jv_Environment_Properties[property_count].value_length = length;
 813
 814       if (p)
 815         p += length;
 816
 817       property_count++;
 818     }
 819   memset ((void *) &_Jv_Environment_Properties[property_count],
 820           0, sizeof (property_pair));
 821   {
 822     size_t i = 0;
 823
 824     // Null terminate the strings.
 825     while (_Jv_Environment_Properties[i].key)
 826       {
 827         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 828         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 829       }
 830   }
 831 }
 832 #endif // DISABLE_GETENV_PROPERTIES
 833
 834 jint
 835 _Jv_CreateJavaVM (void* /*vm_args*/)
 836 {
 837   PROCESS_GCJ_PROPERTIES;
 838
 839   // Turn stack trace generation off while creating exception objects.
 840   _Jv_InitClass (&java::lang::Throwable::class$);
 841   java::lang::Throwable::trace_enabled = 0;
 842
 843   INIT_SEGV;
 844 #ifdef HANDLE_FPE
 845   INIT_FPE;
 846 #else
 847   arithexception = new java::lang::ArithmeticException
 848     (JvNewStringLatin1 ("/ by zero"));
 849 #endif
 850
 851   no_memory = new java::lang::OutOfMemoryError;
 852
 853   java::lang::Throwable::trace_enabled = 1;
 854
 855 #ifdef USE_LTDL
 856   LTDL_SET_PRELOADED_SYMBOLS ();
 857 #endif
 858
 859 #ifdef USE_WINSOCK
 860   // Initialise winsock for networking
 861   WSADATA data;
 862   if (WSAStartup (MAKEWORD (1, 1), &data))
 863       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 864 #endif /* USE_WINSOCK */
 865
 866 #ifdef USE_WIN32_SIGNALLING
 867   // Install exception handler
 868   SetUnhandledExceptionFilter (win32_exception_handler);
 869 #elif defined(HAVE_SIGACTION)
 870   // We only want this on POSIX systems.
 871   struct sigaction act;
 872   act.sa_handler = SIG_IGN;
 873   sigemptyset (&act.sa_mask);
 874   act.sa_flags = 0;
 875   sigaction (SIGPIPE, &act, NULL);
 876 #else
 877   signal (SIGPIPE, SIG_IGN);
 878 #endif
 879
 880   _Jv_JNI_Init ();
 881
 882   return 0;
 883 }
 884
 885 void
 886 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 887              bool is_jar)
 888 {
 889   _Jv_argv = argv;
 890   _Jv_argc = argc;
 891
 892   java::lang::Runtime *runtime = NULL;
 893
 894 #ifdef HAVE_PROC_SELF_EXE
 895   char exec_name[20];
 896   sprintf (exec_name, "/proc/%d/exe", getpid ());
 897   _Jv_ThisExecutable (exec_name);
 898 #else
 899   _Jv_ThisExecutable (argv[0]);
 900 #endif
 901
 902   try
 903     {
 904       _Jv_CreateJavaVM (NULL);
 905
 906       // Get the Runtime here.  We want to initialize it before searching
 907       // for `main'; that way it will be set up if `main' is a JNI method.
 908       runtime = java::lang::Runtime::getRuntime ();
 909
 910       arg_vec = JvConvertArgv (argc - 1, argv + 1);
 911
 912       if (klass)
 913         main_thread = new gnu::gcj::runtime::FirstThread (klass, arg_vec);
 914       else
 915         main_thread = new gnu::gcj::runtime::FirstThread
 916                         (JvNewStringLatin1 (name), arg_vec, is_jar);
 917
 918       if (is_jar)
 919         {
 920           // We need a new ClassLoader because the classpath must be the
 921           // jar file only.  The easiest way to do this is to lose our
 922           // reference to the previous classloader.
 923           _Jv_Jar_Class_Path = strdup (name);
 924           java::lang::ClassLoader::system = NULL;
 925         }
 926     }
 927   catch (java::lang::Throwable *t)
 928     {
 929       java::lang::System::err->println (JvNewStringLatin1
 930         ("Exception during runtime initialization"));
 931       t->printStackTrace();
 932       runtime->exit (1);
 933     }
 934
 935   _Jv_AttachCurrentThread (main_thread);
 936   _Jv_ThreadRun (main_thread);
 937   _Jv_ThreadWait ();
 938
 939   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 940   runtime->exit (status);
 941 }
 942
 943 void
 944 JvRunMain (jclass klass, int argc, const char **argv)
 945 {
 946   _Jv_RunMain (klass, NULL, argc, argv, false);
 947 }
 948
 949 \f
 950
 951 // Parse a string and return a heap size.
 952 static size_t
 953 parse_heap_size (const char *spec)
 954 {
 955   char *end;
 956   unsigned long val = strtoul (spec, &end, 10);
 957   if (*end == 'k' || *end == 'K')
 958     val *= 1024;
 959   else if (*end == 'm' || *end == 'M')
 960     val *= 1048576;
 961   return (size_t) val;
 962 }
 963
 964 // Set the initial heap size.  This might be ignored by the GC layer.
 965 // This must be called before _Jv_RunMain.
 966 void
 967 _Jv_SetInitialHeapSize (const char *arg)
 968 {
 969   size_t size = parse_heap_size (arg);
 970   _Jv_GCSetInitialHeapSize (size);
 971 }
 972
 973 // Set the maximum heap size.  This might be ignored by the GC layer.
 974 // This must be called before _Jv_RunMain.
 975 void
 976 _Jv_SetMaximumHeapSize (const char *arg)
 977 {
 978   size_t size = parse_heap_size (arg);
 979   _Jv_GCSetMaximumHeapSize (size);
 980 }
 981
 982 \f
 983
 984 void *
 985 _Jv_Malloc (jsize size)
 986 {
 987   if (__builtin_expect (size == 0, false))
 988     size = 1;
 989   void *ptr = malloc ((size_t) size);
 990   if (__builtin_expect (ptr == NULL, false))
 991     throw no_memory;
 992   return ptr;
 993 }
 994
 995 void *
 996 _Jv_Realloc (void *ptr, jsize size)
 997 {
 998   if (__builtin_expect (size == 0, false))
 999     size = 1;
1000   ptr = realloc (ptr, (size_t) size);
1001   if (__builtin_expect (ptr == NULL, false))
1002     throw no_memory;
1003   return ptr;
1004 }
1005
1006 void *
1007 _Jv_MallocUnchecked (jsize size)
1008 {
1009   if (__builtin_expect (size == 0, false))
1010     size = 1;
1011   return malloc ((size_t) size);
1012 }
1013
1014 void
1015 _Jv_Free (void* ptr)
1016 {
1017   return free (ptr);
1018 }
1019
1020 \f
1021
1022 // In theory, these routines can be #ifdef'd away on machines which
1023 // support divide overflow signals.  However, we never know if some
1024 // code might have been compiled with "-fuse-divide-subroutine", so we
1025 // always include them in libgcj.
1026
1027 jint
1028 _Jv_divI (jint dividend, jint divisor)
1029 {
1030   if (__builtin_expect (divisor == 0, false))
1031     _Jv_ThrowSignal (arithexception);
1032
1033   if (dividend == (jint) 0x80000000L && divisor == -1)
1034     return dividend;
1035
1036   return dividend / divisor;
1037 }
1038
1039 jint
1040 _Jv_remI (jint dividend, jint divisor)
1041 {
1042   if (__builtin_expect (divisor == 0, false))
1043     _Jv_ThrowSignal (arithexception);
1044
1045   if (dividend == (jint) 0x80000000L && divisor == -1)
1046     return 0;
1047
1048   return dividend % divisor;
1049 }
1050
1051 jlong
1052 _Jv_divJ (jlong dividend, jlong divisor)
1053 {
1054   if (__builtin_expect (divisor == 0, false))
1055     _Jv_ThrowSignal (arithexception);
1056
1057   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1058     return dividend;
1059
1060   return dividend / divisor;
1061 }
1062
1063 jlong
1064 _Jv_remJ (jlong dividend, jlong divisor)
1065 {
1066   if (__builtin_expect (divisor == 0, false))
1067     _Jv_ThrowSignal (arithexception);
1068
1069   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1070     return 0;
1071
1072   return dividend % divisor;
1073 }