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 typedef void main_func (jobject);
 100
 101 #ifdef ENABLE_JVMPI
 102 // Pointer to JVMPI notification functions.
 103 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 104 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 105 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 106 #endif
 107 \f
 108
 109 extern "C" void _Jv_ThrowSignal (jthrowable) __attribute ((noreturn));
 110
 111 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 112 // this is declared extern in order that its name not be mangled, it
 113 // is not intended to be used outside this file.
 114 void
 115 _Jv_ThrowSignal (jthrowable throwable)
 116 {
 117   throwable->fillInStackTrace ();
 118   throw throwable;
 119 }
 120
 121 #ifdef HANDLE_SEGV
 122 static java::lang::NullPointerException *nullp;
 123
 124 SIGNAL_HANDLER (catch_segv)
 125 {
 126   MAKE_THROW_FRAME (nullp);
 127   _Jv_ThrowSignal (nullp);
 128 }
 129 #endif
 130
 131 static java::lang::ArithmeticException *arithexception;
 132
 133 #ifdef HANDLE_FPE
 134 SIGNAL_HANDLER (catch_fpe)
 135 {
 136 #ifdef HANDLE_DIVIDE_OVERFLOW
 137   HANDLE_DIVIDE_OVERFLOW;
 138 #else
 139   MAKE_THROW_FRAME (arithexception);
 140 #endif
 141   _Jv_ThrowSignal (arithexception);
 142 }
 143 #endif
 144
 145 \f
 146
 147 jboolean
 148 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 149 {
 150   int len;
 151   _Jv_ushort *aptr, *bptr;
 152   if (a == b)
 153     return true;
 154   if (a->hash != b->hash)
 155     return false;
 156   len = a->length;
 157   if (b->length != len)
 158     return false;
 159   aptr = (_Jv_ushort *)a->data;
 160   bptr = (_Jv_ushort *)b->data;
 161   len = (len + 1) >> 1;
 162   while (--len >= 0)
 163     if (*aptr++ != *bptr++)
 164       return false;
 165   return true;
 166 }
 167
 168 /* True iff A is equal to STR.
 169    HASH is STR->hashCode().
 170 */
 171
 172 jboolean
 173 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 174 {
 175   if (a->hash != (_Jv_ushort) hash)
 176     return false;
 177   jint len = str->length();
 178   jint i = 0;
 179   jchar *sptr = _Jv_GetStringChars (str);
 180   unsigned char* ptr = (unsigned char*) a->data;
 181   unsigned char* limit = ptr + a->length;
 182   for (;; i++, sptr++)
 183     {
 184       int ch = UTF8_GET (ptr, limit);
 185       if (i == len)
 186         return ch < 0;
 187       if (ch != *sptr)
 188         return false;
 189     }
 190   return true;
 191 }
 192
 193 /* Like _Jv_equal, but stop after N characters.  */
 194 jboolean
 195 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 196 {
 197   jint len = str->length();
 198   jint i = 0;
 199   jchar *sptr = _Jv_GetStringChars (str);
 200   unsigned char* ptr = (unsigned char*) a->data;
 201   unsigned char* limit = ptr + a->length;
 202   for (; n-- > 0; i++, sptr++)
 203     {
 204       int ch = UTF8_GET (ptr, limit);
 205       if (i == len)
 206         return ch < 0;
 207       if (ch != *sptr)
 208         return false;
 209     }
 210   return true;
 211 }
 212
 213 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 214 int
 215 _Jv_strLengthUtf8(char* str, int len)
 216 {
 217   unsigned char* ptr;
 218   unsigned char* limit;
 219   int str_length;
 220
 221   ptr = (unsigned char*) str;
 222   limit = ptr + len;
 223   str_length = 0;
 224   for (; ptr < limit; str_length++)
 225     {
 226       if (UTF8_GET (ptr, limit) < 0)
 227         return (-1);
 228     }
 229   return (str_length);
 230 }
 231
 232 /* Calculate a hash value for a string encoded in Utf8 format.
 233  * This returns the same hash value as specified or java.lang.String.hashCode.
 234  */
 235 static jint
 236 hashUtf8String (char* str, int len)
 237 {
 238   unsigned char* ptr = (unsigned char*) str;
 239   unsigned char* limit = ptr + len;
 240   jint hash = 0;
 241
 242   for (; ptr < limit;)
 243     {
 244       int ch = UTF8_GET (ptr, limit);
 245       /* Updated specification from
 246          http://www.javasoft.com/docs/books/jls/clarify.html. */
 247       hash = (31 * hash) + ch;
 248     }
 249   return hash;
 250 }
 251
 252 _Jv_Utf8Const *
 253 _Jv_makeUtf8Const (char* s, int len)
 254 {
 255   if (len < 0)
 256     len = strlen (s);
 257   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 258   if (! m)
 259     throw no_memory;
 260   memcpy (m->data, s, len);
 261   m->data[len] = 0;
 262   m->length = len;
 263   m->hash = hashUtf8String (s, len) & 0xFFFF;
 264   return (m);
 265 }
 266
 267 _Jv_Utf8Const *
 268 _Jv_makeUtf8Const (jstring string)
 269 {
 270   jint hash = string->hashCode ();
 271   jint len = _Jv_GetStringUTFLength (string);
 272
 273   Utf8Const* m = (Utf8Const*)
 274     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 275
 276   m->hash = hash;
 277   m->length = len;
 278
 279   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 280   m->data[len] = 0;
 281
 282   return m;
 283 }
 284
 285 \f
 286
 287 #ifdef DEBUG
 288 void
 289 _Jv_Abort (const char *function, const char *file, int line,
 290            const char *message)
 291 #else
 292 void
 293 _Jv_Abort (const char *, const char *, int, const char *message)
 294 #endif
 295 {
 296 #ifdef DEBUG
 297   fprintf (stderr,
 298            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 299            message, function, file, line);
 300 #else
 301   java::io::PrintStream *err = java::lang::System::err;
 302   err->print(JvNewStringLatin1 ("libgcj failure: "));
 303   err->println(JvNewStringLatin1 (message));
 304   err->flush();
 305 #endif
 306   abort ();
 307 }
 308
 309 static void
 310 fail_on_finalization (jobject)
 311 {
 312   JvFail ("object was finalized");
 313 }
 314
 315 void
 316 _Jv_GCWatch (jobject obj)
 317 {
 318   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 319 }
 320
 321 void
 322 _Jv_ThrowBadArrayIndex(jint bad_index)
 323 {
 324   throw new java::lang::ArrayIndexOutOfBoundsException
 325     (java::lang::String::valueOf (bad_index));
 326 }
 327
 328 void
 329 _Jv_ThrowNullPointerException ()
 330 {
 331   throw new java::lang::NullPointerException;
 332 }
 333
 334 // Explicitly throw a no memory exception.
 335 // The collector calls this when it encounters an out-of-memory condition.
 336 void _Jv_ThrowNoMemory()
 337 {
 338   _Jv_Throw (no_memory);
 339 }
 340
 341 // Allocate a new object of class KLASS.  SIZE is the size of the object
 342 // to allocate.  You might think this is redundant, but it isn't; some
 343 // classes, such as String, aren't of fixed size.
 344 jobject
 345 _Jv_AllocObject (jclass klass, jint size)
 346 {
 347   _Jv_InitClass (klass);
 348
 349   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 350
 351   // If this class has inherited finalize from Object, then don't
 352   // bother registering a finalizer.  We know that finalize() is the
 353   // very first method after the dummy entry.  If this turns out to be
 354   // unreliable, a more robust implementation can be written.  Such an
 355   // implementation would look for Object.finalize in Object's method
 356   // table at startup, and then use that information to find the
 357   // appropriate index in the method vector.
 358   if (klass->vtable->get_finalizer()
 359       != java::lang::Object::class$.vtable->get_finalizer())
 360     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 361
 362 #ifdef ENABLE_JVMPI
 363   // Service JVMPI request.
 364
 365   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 366     {
 367       JVMPI_Event event;
 368
 369       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 370       event.env_id = NULL;
 371       event.u.obj_alloc.arena_id = 0;
 372       event.u.obj_alloc.class_id = (jobjectID) klass;
 373       event.u.obj_alloc.is_array = 0;
 374       event.u.obj_alloc.size = size;
 375       event.u.obj_alloc.obj_id = (jobjectID) obj;
 376
 377       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 378       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 379       // More importantly, I don't see the need for disabling GC, since we
 380       // blatantly have a pointer to obj on our stack, ensuring that the
 381       // object can't be collected.  Even for a nonconservative collector,
 382       // it appears to me that this must be true, since we are about to
 383       // return obj. Isn't this whole approach way too intrusive for
 384       // a useful profiling interface?                  - HB
 385       _Jv_DisableGC ();
 386       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 387       _Jv_EnableGC ();
 388     }
 389 #endif
 390
 391   return obj;
 392 }
 393
 394 // A version of the above that assumes the object contains no pointers,
 395 // and requires no finalization.  This can't happen if we need pointers
 396 // to locks.
 397 #ifdef JV_HASH_SYNCHRONIZATION
 398 jobject
 399 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 400 {
 401   _Jv_InitClass (klass);
 402
 403   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 404
 405 #ifdef ENABLE_JVMPI
 406   // Service JVMPI request.
 407
 408   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 409     {
 410       JVMPI_Event event;
 411
 412       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 413       event.env_id = NULL;
 414       event.u.obj_alloc.arena_id = 0;
 415       event.u.obj_alloc.class_id = (jobjectID) klass;
 416       event.u.obj_alloc.is_array = 0;
 417       event.u.obj_alloc.size = size;
 418       event.u.obj_alloc.obj_id = (jobjectID) obj;
 419
 420       _Jv_DisableGC ();
 421       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 422       _Jv_EnableGC ();
 423     }
 424 #endif
 425
 426   return obj;
 427 }
 428 #endif /* JV_HASH_SYNCHRONIZATION */
 429
 430
 431 // Allocate a new array of Java objects.  Each object is of type
 432 // `elementClass'.  `init' is used to initialize each slot in the
 433 // array.
 434 jobjectArray
 435 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 436 {
 437   if (__builtin_expect (count < 0, false))
 438     throw new java::lang::NegativeArraySizeException;
 439
 440   JvAssert (! elementClass->isPrimitive ());
 441
 442   // Ensure that elements pointer is properly aligned.
 443   jobjectArray obj = NULL;
 444   size_t size = (size_t) elements (obj);
 445   size += count * sizeof (jobject);
 446
 447   // FIXME: second argument should be "current loader"
 448   jclass klass = _Jv_GetArrayClass (elementClass, 0);
 449
 450   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 451   // Cast away const.
 452   jsize *lp = const_cast<jsize *> (&obj->length);
 453   *lp = count;
 454   // We know the allocator returns zeroed memory.  So don't bother
 455   // zeroing it again.
 456   if (init)
 457     {
 458       jobject *ptr = elements(obj);
 459       while (--count >= 0)
 460         *ptr++ = init;
 461     }
 462   return obj;
 463 }
 464
 465 // Allocate a new array of primitives.  ELTYPE is the type of the
 466 // element, COUNT is the size of the array.
 467 jobject
 468 _Jv_NewPrimArray (jclass eltype, jint count)
 469 {
 470   int elsize = eltype->size();
 471   if (__builtin_expect (count < 0, false))
 472     throw new java::lang::NegativeArraySizeException;
 473
 474   JvAssert (eltype->isPrimitive ());
 475   jobject dummy = NULL;
 476   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 477
 478   // Check for overflow.
 479   if (__builtin_expect ((size_t) count >
 480                         (SIZE_T_MAX - size) / elsize, false))
 481     throw no_memory;
 482
 483   jclass klass = _Jv_GetArrayClass (eltype, 0);
 484
 485 # ifdef JV_HASH_SYNCHRONIZATION
 486   // Since the vtable is always statically allocated,
 487   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 488   __JArray *arr =
 489     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 490   memset((char *)arr + size, 0, elsize * count);
 491 # else
 492   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 493   // Note that we assume we are given zeroed memory by the allocator.
 494 # endif
 495   // Cast away const.
 496   jsize *lp = const_cast<jsize *> (&arr->length);
 497   *lp = count;
 498
 499   return arr;
 500 }
 501
 502 jobject
 503 _Jv_NewArray (jint type, jint size)
 504 {
 505   switch (type)
 506     {
 507       case  4:  return JvNewBooleanArray (size);
 508       case  5:  return JvNewCharArray (size);
 509       case  6:  return JvNewFloatArray (size);
 510       case  7:  return JvNewDoubleArray (size);
 511       case  8:  return JvNewByteArray (size);
 512       case  9:  return JvNewShortArray (size);
 513       case 10:  return JvNewIntArray (size);
 514       case 11:  return JvNewLongArray (size);
 515     }
 516   JvFail ("newarray - bad type code");
 517   return NULL;                  // Placate compiler.
 518 }
 519
 520 jobject
 521 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 522 {
 523   JvAssert (type->isArray());
 524   jclass element_type = type->getComponentType();
 525   jobject result;
 526   if (element_type->isPrimitive())
 527     result = _Jv_NewPrimArray (element_type, sizes[0]);
 528   else
 529     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 530
 531   if (dimensions > 1)
 532     {
 533       JvAssert (! element_type->isPrimitive());
 534       JvAssert (element_type->isArray());
 535       jobject *contents = elements ((jobjectArray) result);
 536       for (int i = 0; i < sizes[0]; ++i)
 537         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 538                                          sizes + 1);
 539     }
 540
 541   return result;
 542 }
 543
 544 jobject
 545 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 546 {
 547   va_list args;
 548   jint sizes[dimensions];
 549   va_start (args, dimensions);
 550   for (int i = 0; i < dimensions; ++i)
 551     {
 552       jint size = va_arg (args, jint);
 553       sizes[i] = size;
 554     }
 555   va_end (args);
 556
 557   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 558 }
 559
 560 \f
 561
 562 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN)                               \
 563   _Jv_ArrayVTable _Jv_##NAME##VTable;                                   \
 564   java::lang::Class _Jv_##NAME##Class ((jobject) #NAME,                 \
 565                                        (jbyte) SIG, (jint) LEN,         \
 566                                        (jobject) &_Jv_##NAME##VTable);
 567
 568 DECLARE_PRIM_TYPE(byte, 'B', 1);
 569 DECLARE_PRIM_TYPE(short, 'S', 2);
 570 DECLARE_PRIM_TYPE(int, 'I', 4);
 571 DECLARE_PRIM_TYPE(long, 'J', 8);
 572 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 573 DECLARE_PRIM_TYPE(char, 'C', 2);
 574 DECLARE_PRIM_TYPE(float, 'F', 4);
 575 DECLARE_PRIM_TYPE(double, 'D', 8);
 576 DECLARE_PRIM_TYPE(void, 'V', 0);
 577
 578 jclass
 579 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 580 {
 581   switch (*sig)
 582     {
 583     case 'B':
 584       return JvPrimClass (byte);
 585     case 'S':
 586       return JvPrimClass (short);
 587     case 'I':
 588       return JvPrimClass (int);
 589     case 'J':
 590       return JvPrimClass (long);
 591     case 'Z':
 592       return JvPrimClass (boolean);
 593     case 'C':
 594       return JvPrimClass (char);
 595     case 'F':
 596       return JvPrimClass (float);
 597     case 'D':
 598       return JvPrimClass (double);
 599     case 'V':
 600       return JvPrimClass (void);
 601     case 'L':
 602       {
 603         int i;
 604         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 605           ;
 606         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 607         return _Jv_FindClass (name, loader);
 608
 609       }
 610     case '[':
 611       {
 612         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 613         if (! klass)
 614           return NULL;
 615         return _Jv_GetArrayClass (klass, loader);
 616       }
 617     }
 618
 619   return NULL;                  // Placate compiler.
 620 }
 621
 622 \f
 623
 624 JArray<jstring> *
 625 JvConvertArgv (int argc, const char **argv)
 626 {
 627   if (argc < 0)
 628     argc = 0;
 629   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 630   jobject* ptr = elements(ar);
 631   for (int i = 0;  i < argc;  i++)
 632     {
 633       const char *arg = argv[i];
 634       // FIXME - should probably use JvNewStringUTF.
 635       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 636     }
 637   return (JArray<jstring>*) ar;
 638 }
 639
 640 // FIXME: These variables are static so that they will be
 641 // automatically scanned by the Boehm collector.  This is needed
 642 // because with qthreads the collector won't scan the initial stack --
 643 // it will only scan the qthreads stacks.
 644
 645 // Command line arguments.
 646 static jobject arg_vec;
 647
 648 // The primary thread.
 649 static java::lang::Thread *main_thread;
 650
 651 char *
 652 _Jv_ThisExecutable (void)
 653 {
 654   return _Jv_execName;
 655 }
 656
 657 void
 658 _Jv_ThisExecutable (const char *name)
 659 {
 660   if (name)
 661     {
 662       _Jv_execName = (char *) _Jv_Malloc (strlen (name) + 1);
 663       strcpy (_Jv_execName, name);
 664     }
 665 }
 666
 667 #ifdef USE_WIN32_SIGNALLING
 668
 669 extern "C" int* win32_get_restart_frame (void *);
 670
 671 LONG CALLBACK
 672 win32_exception_handler (LPEXCEPTION_POINTERS e)
 673 {
 674   int* setjmp_buf;
 675   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 676     setjmp_buf = win32_get_restart_frame (nullp);
 677   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 678     setjmp_buf = win32_get_restart_frame (arithexception);
 679   else
 680     return EXCEPTION_CONTINUE_SEARCH;
 681
 682   e->ContextRecord->Ebp = setjmp_buf[0];
 683   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 684   e->ContextRecord->Eip = setjmp_buf[1];
 685   // FIXME: Is this the stack pointer? Do we need it?
 686   e->ContextRecord->Esp = setjmp_buf[2];
 687
 688   return EXCEPTION_CONTINUE_EXECUTION;
 689 }
 690
 691 #endif
 692
 693 /* This will be non-NULL if the user has preloaded a JNI library, or
 694    linked one into the executable.  */
 695 extern "C"
 696 {
 697 #pragma weak JNI_OnLoad
 698   extern jint JNI_OnLoad (JavaVM *, void *) __attribute__((weak));
 699 }
 700
 701
 702 #ifndef DISABLE_GETENV_PROPERTIES
 703
 704 static char *
 705 next_property_key (char *s, size_t *length)
 706 {
 707   size_t l = 0;
 708
 709   JvAssert (s);
 710
 711   // Skip over whitespace
 712   while (isspace (*s))
 713     s++;
 714
 715   // If we've reached the end, return NULL.  Also return NULL if for
 716   // some reason we've come across a malformed property string.
 717   if (*s == 0
 718       || *s == ':'
 719       || *s == '=')
 720     return NULL;
 721
 722   // Determine the length of the property key.
 723   while (s[l] != 0
 724          && ! isspace (s[l])
 725          && s[l] != ':'
 726          && s[l] != '=')
 727     {
 728       if (s[l] == '\\'
 729           && s[l+1] != 0)
 730         l++;
 731       l++;
 732     }
 733
 734   *length = l;
 735
 736   return s;
 737 }
 738
 739 static char *
 740 next_property_value (char *s, size_t *length)
 741 {
 742   size_t l = 0;
 743
 744   JvAssert (s);
 745
 746   while (isspace (*s))
 747     s++;
 748
 749   if (*s == ':'
 750       || *s == '=')
 751     s++;
 752
 753   while (isspace (*s))
 754     s++;
 755
 756   // If we've reached the end, return NULL.
 757   if (*s == 0)
 758     return NULL;
 759
 760   // Determine the length of the property value.
 761   while (s[l] != 0
 762          && ! isspace (s[l])
 763          && s[l] != ':'
 764          && s[l] != '=')
 765     {
 766       if (s[l] == '\\'
 767           && s[l+1] != 0)
 768         l += 2;
 769       else
 770         l++;
 771     }
 772
 773   *length = l;
 774
 775   return s;
 776 }
 777
 778 static void
 779 process_gcj_properties ()
 780 {
 781   char *props = getenv("GCJ_PROPERTIES");
 782   char *p = props;
 783   size_t length;
 784   size_t property_count = 0;
 785
 786   if (NULL == props)
 787     return;
 788
 789   // Whip through props quickly in order to count the number of
 790   // property values.
 791   while (p && (p = next_property_key (p, &length)))
 792     {
 793       // Skip to the end of the key
 794       p += length;
 795
 796       p = next_property_value (p, &length);
 797       if (p)
 798         p += length;
 799
 800       property_count++;
 801     }
 802
 803   // Allocate an array of property value/key pairs.
 804   _Jv_Environment_Properties =
 805     (property_pair *) malloc (sizeof(property_pair)
 806                               * (property_count + 1));
 807
 808   // Go through the properties again, initializing _Jv_Properties
 809   // along the way.
 810   p = props;
 811   property_count = 0;
 812   while (p && (p = next_property_key (p, &length)))
 813     {
 814       _Jv_Environment_Properties[property_count].key = p;
 815       _Jv_Environment_Properties[property_count].key_length = length;
 816
 817       // Skip to the end of the key
 818       p += length;
 819
 820       p = next_property_value (p, &length);
 821
 822       _Jv_Environment_Properties[property_count].value = p;
 823       _Jv_Environment_Properties[property_count].value_length = length;
 824
 825       if (p)
 826         p += length;
 827
 828       property_count++;
 829     }
 830   memset ((void *) &_Jv_Environment_Properties[property_count],
 831           0, sizeof (property_pair));
 832   {
 833     size_t i = 0;
 834
 835     // Null terminate the strings.
 836     while (_Jv_Environment_Properties[i].key)
 837       {
 838         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 839         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 840       }
 841   }
 842 }
 843 #endif // DISABLE_GETENV_PROPERTIES
 844
 845 jint
 846 _Jv_CreateJavaVM (void* /*vm_args*/)
 847 {
 848   PROCESS_GCJ_PROPERTIES;
 849
 850   // Turn stack trace generation off while creating exception objects.
 851   _Jv_InitClass (&java::lang::Throwable::class$);
 852   java::lang::Throwable::trace_enabled = 0;
 853
 854   INIT_SEGV;
 855 #ifdef HANDLE_FPE
 856   INIT_FPE;
 857 #else
 858   arithexception = new java::lang::ArithmeticException
 859     (JvNewStringLatin1 ("/ by zero"));
 860 #endif
 861
 862   no_memory = new java::lang::OutOfMemoryError;
 863
 864   java::lang::Throwable::trace_enabled = 1;
 865
 866 #ifdef USE_LTDL
 867   LTDL_SET_PRELOADED_SYMBOLS ();
 868 #endif
 869
 870 #ifdef USE_WINSOCK
 871   // Initialise winsock for networking
 872   WSADATA data;
 873   if (WSAStartup (MAKEWORD (1, 1), &data))
 874       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 875 #endif /* USE_WINSOCK */
 876
 877 #ifdef USE_WIN32_SIGNALLING
 878   // Install exception handler
 879   SetUnhandledExceptionFilter (win32_exception_handler);
 880 #else
 881   // We only want this on POSIX systems.
 882   struct sigaction act;
 883   act.sa_handler = SIG_IGN;
 884   sigemptyset (&act.sa_mask);
 885   act.sa_flags = 0;
 886   sigaction (SIGPIPE, &act, NULL);
 887 #endif /* USE_WIN32_SIGNALLING */
 888
 889   _Jv_JNI_Init ();
 890
 891   /* Some systems let you preload shared libraries before running a
 892      program.  Under Linux, this is done by setting the LD_PRELOAD
 893      environment variable.  We take advatage of this here to allow for
 894      dynamically loading a JNI library into a fully linked executable.  */
 895
 896   if (JNI_OnLoad != NULL)
 897     {
 898       JavaVM *vm = _Jv_GetJavaVM ();
 899       if (vm == NULL)
 900         {
 901           // FIXME: what?
 902           return -1;
 903         }
 904       jint vers = JNI_OnLoad (vm, NULL);
 905       if (vers != JNI_VERSION_1_1 && vers != JNI_VERSION_1_2)
 906         {
 907           // FIXME: unload the library.
 908           _Jv_Throw (new java::lang::UnsatisfiedLinkError (JvNewStringLatin1 ("unrecognized version from preloaded JNI_OnLoad")));
 909         }
 910     }
 911   return 0;
 912 }
 913
 914 static void
 915 runFirst (::java::lang::Class *klass, ::java::lang::Object *args)
 916 {
 917   Utf8Const* main_signature = _Jv_makeUtf8Const ("([Ljava.lang.String;)V", 22);
 918   Utf8Const* main_name = _Jv_makeUtf8Const ("main", 4);
 919
 920   _Jv_Method *meth = _Jv_GetMethodLocal (klass, main_name, main_signature);
 921
 922   // Some checks from Java Spec section 12.1.4.
 923   const char *msg = NULL;
 924   if (meth == NULL)
 925     msg = "no suitable method `main' in class";
 926   else if (! java::lang::reflect::Modifier::isStatic(meth->accflags))
 927     msg = "`main' must be static";
 928   else if (! java::lang::reflect::Modifier::isPublic(meth->accflags))
 929     msg =  "`main' must be public";
 930   if (msg != NULL)
 931     {
 932       fprintf (stderr, "%s\n", msg);
 933       ::exit(1);
 934     }
 935
 936 #ifdef WITH_JVMPI
 937   if (_Jv_JVMPI_Notify_THREAD_START)
 938     {
 939       JVMPI_Event event;
 940
 941       jstring thread_name = getName ();
 942       jstring group_name = NULL, parent_name = NULL;
 943       java::lang::ThreadGroup *group = getThreadGroup ();
 944
 945       if (group)
 946         {
 947           group_name = group->getName ();
 948           group = group->getParent ();
 949
 950           if (group)
 951             parent_name = group->getName ();
 952         }
 953
 954       int thread_len = thread_name ? JvGetStringUTFLength (thread_name) : 0;
 955       int group_len = group_name ? JvGetStringUTFLength (group_name) : 0;
 956       int parent_len = parent_name ? JvGetStringUTFLength (parent_name) : 0;
 957
 958       char thread_chars[thread_len + 1];
 959       char group_chars[group_len + 1];
 960       char parent_chars[parent_len + 1];
 961
 962       if (thread_name)
 963         JvGetStringUTFRegion (thread_name, 0,
 964                               thread_name->length(), thread_chars);
 965       if (group_name)
 966         JvGetStringUTFRegion (group_name, 0,
 967                               group_name->length(), group_chars);
 968       if (parent_name)
 969         JvGetStringUTFRegion (parent_name, 0,
 970                               parent_name->length(), parent_chars);
 971
 972       thread_chars[thread_len] = '\0';
 973       group_chars[group_len] = '\0';
 974       parent_chars[parent_len] = '\0';
 975
 976       event.event_type = JVMPI_EVENT_THREAD_START;
 977       event.env_id = NULL;
 978       event.u.thread_start.thread_name = thread_chars;
 979       event.u.thread_start.group_name = group_chars;
 980       event.u.thread_start.parent_name = parent_chars;
 981       event.u.thread_start.thread_id = (jobjectID) this;
 982       event.u.thread_start.thread_env_id = _Jv_GetCurrentJNIEnv ();
 983
 984       _Jv_DisableGC ();
 985       (*_Jv_JVMPI_Notify_THREAD_START) (&event);
 986       _Jv_EnableGC ();
 987     }
 988 #endif
 989
 990   main_func *real_main = (main_func *) meth->ncode;
 991   (*real_main) (args);
 992 }
 993
 994 void
 995 JvRunMain (jclass klass, int argc, const char **argv)
 996 {
 997   _Jv_argv = argv;
 998   _Jv_argc = argc;
 999
1000   _Jv_CreateJavaVM (NULL);
1001 #ifdef HAVE_PROC_SELF_EXE
1002   char exec_name[20];
1003   sprintf (exec_name, "/proc/%d/exe", getpid ());
1004   _Jv_ThisExecutable (exec_name);
1005 #else
1006   _Jv_ThisExecutable (argv[0]);
1007 #endif
1008
1009   main_thread = _Jv_AttachCurrentThread (JvNewStringLatin1 ("main"), NULL);
1010   arg_vec = JvConvertArgv (argc - 1, argv + 1);
1011   runFirst (klass, arg_vec);
1012   _Jv_ThreadWait ();
1013
1014   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1015
1016   java::lang::Runtime::getRuntime ()->_exit (status);
1017 }
1018
1019 void
1020 _Jv_RunMain (const char *name, int argc, const char **argv, bool is_jar)
1021 {
1022   jstring class_name;
1023
1024   _Jv_CreateJavaVM (NULL);
1025
1026 #ifdef HAVE_PROC_SELF_EXE
1027   char exec_name[20];
1028   sprintf (exec_name, "/proc/%d/exe", getpid ());
1029   _Jv_ThisExecutable (exec_name);
1030 #endif
1031
1032   main_thread = _Jv_AttachCurrentThread (JvNewStringLatin1 ("main"), NULL);
1033
1034   if (is_jar)
1035     {
1036       // name specifies a jar file.  We must now extract the
1037       // Main-Class attribute from the jar's manifest file.
1038       // This is done by gnu.gcj.runtime.FirstThread.getMain.
1039       _Jv_Jar_Class_Path = strdup (name);
1040       jstring jar_name = JvNewStringLatin1 (name);
1041       // FirstThread.getMain extracts the main class name.
1042       class_name = gnu::gcj::runtime::FirstThread::getMain (jar_name);
1043
1044       // We need a new ClassLoader because the classpath must be the
1045       // jar file only.  The easiest way to do this is to lose our
1046       // reference to the previous classloader.
1047       java::lang::ClassLoader::system = NULL;
1048     }
1049   else
1050     class_name = JvNewStringLatin1 (name);
1051
1052   arg_vec = JvConvertArgv (argc - 1, argv + 1);
1053
1054   if (class_name)
1055     {
1056       runFirst(java::lang::Class::forName (class_name), arg_vec);
1057       _Jv_ThreadWait ();
1058     }
1059
1060   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1061
1062   java::lang::Runtime::getRuntime ()->exit (status);
1063 }
1064
1065 \f
1066
1067 // Parse a string and return a heap size.
1068 static size_t
1069 parse_heap_size (const char *spec)
1070 {
1071   char *end;
1072   unsigned long val = strtoul (spec, &end, 10);
1073   if (*end == 'k' || *end == 'K')
1074     val *= 1024;
1075   else if (*end == 'm' || *end == 'M')
1076     val *= 1048576;
1077   return (size_t) val;
1078 }
1079
1080 // Set the initial heap size.  This might be ignored by the GC layer.
1081 // This must be called before _Jv_RunMain.
1082 void
1083 _Jv_SetInitialHeapSize (const char *arg)
1084 {
1085   size_t size = parse_heap_size (arg);
1086   _Jv_GCSetInitialHeapSize (size);
1087 }
1088
1089 // Set the maximum heap size.  This might be ignored by the GC layer.
1090 // This must be called before _Jv_RunMain.
1091 void
1092 _Jv_SetMaximumHeapSize (const char *arg)
1093 {
1094   size_t size = parse_heap_size (arg);
1095   _Jv_GCSetMaximumHeapSize (size);
1096 }
1097
1098 \f
1099
1100 void *
1101 _Jv_Malloc (jsize size)
1102 {
1103   if (__builtin_expect (size == 0, false))
1104     size = 1;
1105   void *ptr = malloc ((size_t) size);
1106   if (__builtin_expect (ptr == NULL, false))
1107     throw no_memory;
1108   return ptr;
1109 }
1110
1111 void *
1112 _Jv_Realloc (void *ptr, jsize size)
1113 {
1114   if (__builtin_expect (size == 0, false))
1115     size = 1;
1116   ptr = realloc (ptr, (size_t) size);
1117   if (__builtin_expect (ptr == NULL, false))
1118     throw no_memory;
1119   return ptr;
1120 }
1121
1122 void *
1123 _Jv_MallocUnchecked (jsize size)
1124 {
1125   if (__builtin_expect (size == 0, false))
1126     size = 1;
1127   return malloc ((size_t) size);
1128 }
1129
1130 void
1131 _Jv_Free (void* ptr)
1132 {
1133   return free (ptr);
1134 }
1135
1136 \f
1137
1138 // In theory, these routines can be #ifdef'd away on machines which
1139 // support divide overflow signals.  However, we never know if some
1140 // code might have been compiled with "-fuse-divide-subroutine", so we
1141 // always include them in libgcj.
1142
1143 jint
1144 _Jv_divI (jint dividend, jint divisor)
1145 {
1146   if (__builtin_expect (divisor == 0, false))
1147     _Jv_ThrowSignal (arithexception);
1148
1149   if (dividend == (jint) 0x80000000L && divisor == -1)
1150     return dividend;
1151
1152   return dividend / divisor;
1153 }
1154
1155 jint
1156 _Jv_remI (jint dividend, jint divisor)
1157 {
1158   if (__builtin_expect (divisor == 0, false))
1159     _Jv_ThrowSignal (arithexception);
1160
1161   if (dividend == (jint) 0x80000000L && divisor == -1)
1162     return 0;
1163
1164   return dividend % divisor;
1165 }
1166
1167 jlong
1168 _Jv_divJ (jlong dividend, jlong divisor)
1169 {
1170   if (__builtin_expect (divisor == 0, false))
1171     _Jv_ThrowSignal (arithexception);
1172
1173   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1174     return dividend;
1175
1176   return dividend / divisor;
1177 }
1178
1179 jlong
1180 _Jv_remJ (jlong dividend, jlong divisor)
1181 {
1182   if (__builtin_expect (divisor == 0, false))
1183     _Jv_ThrowSignal (arithexception);
1184
1185   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1186     return 0;
1187
1188   return dividend % divisor;
1189 }