libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000  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 #endif
  40
  41 #ifndef DISABLE_GETENV_PROPERTIES
  42 #include <ctype.h>
  43 #include <java-props.h>
  44 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  45 #else
  46 #define PROCESS_GCJ_PROPERTIES
  47 #endif // DISABLE_GETENV_PROPERTIES
  48
  49 #include <java/lang/Class.h>
  50 #include <java/lang/Runtime.h>
  51 #include <java/lang/String.h>
  52 #include <java/lang/Thread.h>
  53 #include <java/lang/ThreadGroup.h>
  54 #include <gnu/gcj/runtime/FirstThread.h>
  55 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  56 #include <java/lang/ArithmeticException.h>
  57 #include <java/lang/ClassFormatError.h>
  58 #include <java/lang/NegativeArraySizeException.h>
  59 #include <java/lang/NullPointerException.h>
  60 #include <java/lang/OutOfMemoryError.h>
  61 #include <java/lang/System.h>
  62 #include <java/lang/reflect/Modifier.h>
  63 #include <java/io/PrintStream.h>
  64
  65 #ifdef USE_LTDL
  66 #include <ltdl.h>
  67 #endif
  68
  69 #define ObjectClass _CL_Q34java4lang6Object
  70 extern java::lang::Class ObjectClass;
  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 // Properties set at compile time.
  80 const char **_Jv_Compiler_Properties;
  81
  82 #ifndef DISABLE_GETENV_PROPERTIES
  83 // Property key/value pairs.
  84 property_pair *_Jv_Environment_Properties;
  85 #endif
  86
  87 // The name of this executable.
  88 static char * _Jv_execName;
  89
  90 #ifdef ENABLE_JVMPI
  91 // Pointer to JVMPI notification functions.
  92 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
  93 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
  94 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
  95 #endif
  96 \f
  97
  98 extern "C" void _Jv_ThrowSignal (void *) __attribute ((noreturn));
  99
 100 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 101 // this is declared extern in order that its name not be mangled, it
 102 // is not intended to be used outside this file.
 103 void
 104 _Jv_ThrowSignal (void *e)
 105 {
 106   java::lang::Throwable *throwable = (java::lang::Throwable *)e;
 107   throwable->fillInStackTrace ();
 108   _Jv_Throw (throwable);
 109 }
 110
 111 #ifdef HANDLE_SEGV
 112 static java::lang::NullPointerException *nullp;
 113
 114 SIGNAL_HANDLER (catch_segv)
 115 {
 116   MAKE_THROW_FRAME (nullp);
 117   _Jv_ThrowSignal (nullp);
 118 }
 119 #endif
 120
 121 static java::lang::ArithmeticException *arithexception;
 122
 123 #ifdef HANDLE_FPE
 124 SIGNAL_HANDLER (catch_fpe)
 125 {
 126 #ifdef HANDLE_DIVIDE_OVERFLOW
 127   HANDLE_DIVIDE_OVERFLOW;
 128 #else
 129   MAKE_THROW_FRAME (arithexception);
 130 #endif
 131   _Jv_ThrowSignal (arithexception);
 132 }
 133 #endif
 134
 135 \f
 136
 137 jboolean
 138 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 139 {
 140   int len;
 141   _Jv_ushort *aptr, *bptr;
 142   if (a == b)
 143     return true;
 144   if (a->hash != b->hash)
 145     return false;
 146   len = a->length;
 147   if (b->length != len)
 148     return false;
 149   aptr = (_Jv_ushort *)a->data;
 150   bptr = (_Jv_ushort *)b->data;
 151   len = (len + 1) >> 1;
 152   while (--len >= 0)
 153     if (*aptr++ != *bptr++)
 154       return false;
 155   return true;
 156 }
 157
 158 /* True iff A is equal to STR.
 159    HASH is STR->hashCode().
 160 */
 161
 162 jboolean
 163 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 164 {
 165   if (a->hash != (_Jv_ushort) hash)
 166     return false;
 167   jint len = str->length();
 168   jint i = 0;
 169   jchar *sptr = _Jv_GetStringChars (str);
 170   unsigned char* ptr = (unsigned char*) a->data;
 171   unsigned char* limit = ptr + a->length;
 172   for (;; i++, sptr++)
 173     {
 174       int ch = UTF8_GET (ptr, limit);
 175       if (i == len)
 176         return ch < 0;
 177       if (ch != *sptr)
 178         return false;
 179     }
 180   return true;
 181 }
 182
 183 /* Like _Jv_equal, but stop after N characters.  */
 184 jboolean
 185 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 186 {
 187   jint len = str->length();
 188   jint i = 0;
 189   jchar *sptr = _Jv_GetStringChars (str);
 190   unsigned char* ptr = (unsigned char*) a->data;
 191   unsigned char* limit = ptr + a->length;
 192   for (; n-- > 0; i++, sptr++)
 193     {
 194       int ch = UTF8_GET (ptr, limit);
 195       if (i == len)
 196         return ch < 0;
 197       if (ch != *sptr)
 198         return false;
 199     }
 200   return true;
 201 }
 202
 203 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 204 int
 205 _Jv_strLengthUtf8(char* str, int len)
 206 {
 207   unsigned char* ptr;
 208   unsigned char* limit;
 209   int str_length;
 210
 211   ptr = (unsigned char*) str;
 212   limit = ptr + len;
 213   str_length = 0;
 214   for (; ptr < limit; str_length++) {
 215     if (UTF8_GET (ptr, limit) < 0) {
 216       return (-1);
 217     }
 218   }
 219   return (str_length);
 220 }
 221
 222 /* Calculate a hash value for a string encoded in Utf8 format.
 223  * This returns the same hash value as specified or java.lang.String.hashCode.
 224  */
 225 static jint
 226 hashUtf8String (char* str, int len)
 227 {
 228   unsigned char* ptr = (unsigned char*) str;
 229   unsigned char* limit = ptr + len;
 230   jint hash = 0;
 231
 232   for (; ptr < limit;)
 233     {
 234       int ch = UTF8_GET (ptr, limit);
 235       /* Updated specification from
 236          http://www.javasoft.com/docs/books/jls/clarify.html. */
 237       hash = (31 * hash) + ch;
 238     }
 239   return hash;
 240 }
 241
 242 _Jv_Utf8Const *
 243 _Jv_makeUtf8Const (char* s, int len)
 244 {
 245   if (len < 0)
 246     len = strlen (s);
 247   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 248   if (! m)
 249     JvThrow (no_memory);
 250   memcpy (m->data, s, len);
 251   m->data[len] = 0;
 252   m->length = len;
 253   m->hash = hashUtf8String (s, len) & 0xFFFF;
 254   return (m);
 255 }
 256
 257 _Jv_Utf8Const *
 258 _Jv_makeUtf8Const (jstring string)
 259 {
 260   jint hash = string->hashCode ();
 261   jint len = _Jv_GetStringUTFLength (string);
 262
 263   Utf8Const* m = (Utf8Const*)
 264     _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
 265
 266   m->hash = hash;
 267   m->length = len;
 268
 269   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 270   m->data[len] = 0;
 271
 272   return m;
 273 }
 274
 275 \f
 276
 277 #ifdef DEBUG
 278 void
 279 _Jv_Abort (const char *function, const char *file, int line,
 280            const char *message)
 281 #else
 282 void
 283 _Jv_Abort (const char *, const char *, int, const char *message)
 284 #endif
 285 {
 286 #ifdef DEBUG
 287   fprintf (stderr,
 288            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 289            message, function, file, line);
 290 #else
 291   java::io::PrintStream *err = java::lang::System::err;
 292   err->print(JvNewStringLatin1 ("libgcj failure: "));
 293   err->println(JvNewStringLatin1 (message));
 294   err->flush();
 295 #endif
 296   abort ();
 297 }
 298
 299 static void
 300 fail_on_finalization (jobject)
 301 {
 302   JvFail ("object was finalized");
 303 }
 304
 305 void
 306 _Jv_GCWatch (jobject obj)
 307 {
 308   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 309 }
 310
 311 void
 312 _Jv_ThrowBadArrayIndex(jint bad_index)
 313 {
 314   JvThrow (new java::lang::ArrayIndexOutOfBoundsException
 315            (java::lang::String::valueOf(bad_index)));
 316 }
 317
 318 void
 319 _Jv_ThrowNullPointerException ()
 320 {
 321   throw new java::lang::NullPointerException ();
 322 }
 323
 324 // Allocate some unscanned memory and throw an exception if no memory.
 325 void *
 326 _Jv_AllocBytesChecked (jsize size)
 327 {
 328   void *r = _Jv_AllocBytes (size);
 329   if (! r)
 330     _Jv_Throw (no_memory);
 331   return r;
 332 }
 333
 334 // Allocate a new object of class C.  SIZE is the size of the object
 335 // to allocate.  You might think this is redundant, but it isn't; some
 336 // classes, such as String, aren't of fixed size.
 337 jobject
 338 _Jv_AllocObject (jclass c, jint size)
 339 {
 340   _Jv_InitClass (c);
 341
 342   jobject obj = (jobject) _Jv_AllocObj (size);
 343   if (__builtin_expect (! obj, false))
 344     JvThrow (no_memory);
 345   *((_Jv_VTable **) obj) = c->vtable;
 346
 347   // If this class has inherited finalize from Object, then don't
 348   // bother registering a finalizer.  We know that finalize() is the
 349   // very first method after the dummy entry.  If this turns out to be
 350   // unreliable, a more robust implementation can be written.  Such an
 351   // implementation would look for Object.finalize in Object's method
 352   // table at startup, and then use that information to find the
 353   // appropriate index in the method vector.
 354   if (c->vtable->method[1] != ObjectClass.vtable->method[1])
 355     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 356
 357 #ifdef ENABLE_JVMPI
 358   // Service JVMPI request.
 359
 360   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 361     {
 362       JVMPI_Event event;
 363
 364       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 365       event.env_id = NULL;
 366       event.u.obj_alloc.arena_id = 0;
 367       event.u.obj_alloc.class_id = (jobjectID) c;
 368       event.u.obj_alloc.is_array = 0;
 369       event.u.obj_alloc.size = size;
 370       event.u.obj_alloc.obj_id = (jobjectID) obj;
 371
 372       _Jv_DisableGC ();
 373       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 374       _Jv_EnableGC ();
 375     }
 376 #endif
 377
 378   return obj;
 379 }
 380
 381 // Allocate a new array of Java objects.  Each object is of type
 382 // `elementClass'.  `init' is used to initialize each slot in the
 383 // array.
 384 jobjectArray
 385 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 386 {
 387   if (__builtin_expect (count < 0, false))
 388     JvThrow (new java::lang::NegativeArraySizeException);
 389
 390   JvAssert (! elementClass->isPrimitive ());
 391
 392   jobjectArray obj = NULL;
 393   size_t size = (size_t) _Jv_GetArrayElementFromElementType (obj,
 394                                                              elementClass);
 395
 396   // Check for overflow.
 397   if (__builtin_expect ((size_t) count >
 398                         (SIZE_T_MAX - size) / sizeof (jobject), false))
 399     JvThrow (no_memory);
 400
 401   size += count * sizeof (jobject);
 402
 403   // FIXME: second argument should be "current loader" //
 404   jclass clas = _Jv_FindArrayClass (elementClass, 0);
 405
 406   obj = (jobjectArray) _Jv_AllocArray (size);
 407   if (__builtin_expect (! obj, false))
 408     JvThrow (no_memory);
 409   obj->length = count;
 410   jobject* ptr = elements(obj);
 411   // We know the allocator returns zeroed memory.  So don't bother
 412   // zeroing it again.
 413   if (init)
 414     {
 415       while (--count >= 0)
 416         *ptr++ = init;
 417     }
 418   // Set the vtbl last to avoid problems if the GC happens during the
 419   // window in this function between the allocation and this
 420   // assignment.
 421   *((_Jv_VTable **) obj) = clas->vtable;
 422   return obj;
 423 }
 424
 425 // Allocate a new array of primitives.  ELTYPE is the type of the
 426 // element, COUNT is the size of the array.
 427 jobject
 428 _Jv_NewPrimArray (jclass eltype, jint count)
 429 {
 430   int elsize = eltype->size();
 431   if (__builtin_expect (count < 0, false))
 432     JvThrow (new java::lang::NegativeArraySizeException ());
 433
 434   JvAssert (eltype->isPrimitive ());
 435   jobject dummy = NULL;
 436   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 437
 438   // Check for overflow.
 439   if (__builtin_expect ((size_t) count >
 440                         (SIZE_T_MAX - size) / elsize, false))
 441     JvThrow (no_memory);
 442
 443   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count);
 444   if (__builtin_expect (! arr, false))
 445     JvThrow (no_memory);
 446   arr->length = count;
 447   // Note that we assume we are given zeroed memory by the allocator.
 448
 449   jclass klass = _Jv_FindArrayClass (eltype, 0);
 450   // Set the vtbl last to avoid problems if the GC happens during the
 451   // window in this function between the allocation and this
 452   // assignment.
 453   *((_Jv_VTable **) arr) = klass->vtable;
 454   return arr;
 455 }
 456
 457 jobject
 458 _Jv_NewArray (jint type, jint size)
 459 {
 460   switch (type)
 461     {
 462       case  4:  return JvNewBooleanArray (size);
 463       case  5:  return JvNewCharArray (size);
 464       case  6:  return JvNewFloatArray (size);
 465       case  7:  return JvNewDoubleArray (size);
 466       case  8:  return JvNewByteArray (size);
 467       case  9:  return JvNewShortArray (size);
 468       case 10:  return JvNewIntArray (size);
 469       case 11:  return JvNewLongArray (size);
 470     }
 471   JvFail ("newarray - bad type code");
 472   return NULL;                  // Placate compiler.
 473 }
 474
 475 jobject
 476 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 477 {
 478   JvAssert (type->isArray());
 479   jclass element_type = type->getComponentType();
 480   jobject result;
 481   if (element_type->isPrimitive())
 482     result = _Jv_NewPrimArray (element_type, sizes[0]);
 483   else
 484     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 485
 486   if (dimensions > 1)
 487     {
 488       JvAssert (! element_type->isPrimitive());
 489       JvAssert (element_type->isArray());
 490       jobject *contents = elements ((jobjectArray) result);
 491       for (int i = 0; i < sizes[0]; ++i)
 492         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 493                                          sizes + 1);
 494     }
 495
 496   return result;
 497 }
 498
 499 jobject
 500 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 501 {
 502   va_list args;
 503   jint sizes[dimensions];
 504   va_start (args, dimensions);
 505   for (int i = 0; i < dimensions; ++i)
 506     {
 507       jint size = va_arg (args, jint);
 508       sizes[i] = size;
 509     }
 510   va_end (args);
 511
 512   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 513 }
 514
 515 \f
 516
 517 class _Jv_PrimClass : public java::lang::Class
 518 {
 519 public:
 520   // FIXME: calling convention is weird.  If we use the natural types
 521   // then the compiler will complain because they aren't Java types.
 522   _Jv_PrimClass (jobject cname, jbyte sig, jint len)
 523     {
 524       using namespace java::lang::reflect;
 525
 526       // We must initialize every field of the class.  We do this in
 527       // the same order they are declared in Class.h.
 528       next = NULL;
 529       name = _Jv_makeUtf8Const ((char *) cname, -1);
 530       accflags = Modifier::PUBLIC | Modifier::FINAL;
 531       superclass = NULL;
 532       constants.size = 0;
 533       constants.tags = NULL;
 534       constants.data = NULL;
 535       methods = NULL;
 536       method_count = sig;
 537       vtable_method_count = 0;
 538       fields = NULL;
 539       size_in_bytes = len;
 540       field_count = 0;
 541       static_field_count = 0;
 542       vtable = JV_PRIMITIVE_VTABLE;
 543       interfaces = NULL;
 544       loader = NULL;
 545       interface_count = 0;
 546       state = JV_STATE_NOTHING;
 547       thread = NULL;
 548     }
 549 };
 550
 551 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
 552   _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN)
 553
 554 DECLARE_PRIM_TYPE(byte, 'B', 1);
 555 DECLARE_PRIM_TYPE(short, 'S', 2);
 556 DECLARE_PRIM_TYPE(int, 'I', 4);
 557 DECLARE_PRIM_TYPE(long, 'J', 8);
 558 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 559 DECLARE_PRIM_TYPE(char, 'C', 2);
 560 DECLARE_PRIM_TYPE(float, 'F', 4);
 561 DECLARE_PRIM_TYPE(double, 'D', 8);
 562 DECLARE_PRIM_TYPE(void, 'V', 0);
 563
 564 jclass
 565 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 566 {
 567   switch (*sig)
 568     {
 569     case 'B':
 570       return JvPrimClass (byte);
 571     case 'S':
 572       return JvPrimClass (short);
 573     case 'I':
 574       return JvPrimClass (int);
 575     case 'J':
 576       return JvPrimClass (long);
 577     case 'Z':
 578       return JvPrimClass (boolean);
 579     case 'C':
 580       return JvPrimClass (char);
 581     case 'F':
 582       return JvPrimClass (float);
 583     case 'D':
 584       return JvPrimClass (double);
 585     case 'V':
 586       return JvPrimClass (void);
 587     case 'L':
 588       {
 589         int i;
 590         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 591           ;
 592         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 593         return _Jv_FindClass (name, loader);
 594
 595       }
 596     case '[':
 597       return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
 598                                  loader);
 599     }
 600   JvFail ("couldn't understand class signature");
 601   return NULL;                  // Placate compiler.
 602 }
 603
 604 \f
 605
 606 JArray<jstring> *
 607 JvConvertArgv (int argc, const char **argv)
 608 {
 609   if (argc < 0)
 610     argc = 0;
 611   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 612   jobject* ptr = elements(ar);
 613   for (int i = 0;  i < argc;  i++)
 614     {
 615       const char *arg = argv[i];
 616       // FIXME - should probably use JvNewStringUTF.
 617       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 618     }
 619   return (JArray<jstring>*) ar;
 620 }
 621
 622 // FIXME: These variables are static so that they will be
 623 // automatically scanned by the Boehm collector.  This is needed
 624 // because with qthreads the collector won't scan the initial stack --
 625 // it will only scan the qthreads stacks.
 626
 627 // Command line arguments.
 628 static jobject arg_vec;
 629
 630 // The primary threadgroup.
 631 static java::lang::ThreadGroup *main_group;
 632
 633 // The primary thread.
 634 static java::lang::Thread *main_thread;
 635
 636 char *
 637 _Jv_ThisExecutable (void)
 638 {
 639   return _Jv_execName;
 640 }
 641
 642 void
 643 _Jv_ThisExecutable (const char *name)
 644 {
 645   if (name)
 646     {
 647       _Jv_execName = new char[strlen (name) + 1];
 648       strcpy (_Jv_execName, name);
 649     }
 650 }
 651
 652 #ifdef USE_WIN32_SIGNALLING
 653
 654 extern "C" int* win32_get_restart_frame (void *);
 655
 656 LONG CALLBACK
 657 win32_exception_handler (LPEXCEPTION_POINTERS e)
 658 {
 659   int* setjmp_buf;
 660   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 661     setjmp_buf = win32_get_restart_frame (nullp);
 662   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 663     setjmp_buf = win32_get_restart_frame (arithexception);
 664   else
 665     return EXCEPTION_CONTINUE_SEARCH;
 666
 667   e->ContextRecord->Ebp = setjmp_buf[0];
 668   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 669   e->ContextRecord->Eip = setjmp_buf[1];
 670   // FIXME: Is this the stack pointer? Do we need it?
 671   e->ContextRecord->Esp = setjmp_buf[2];
 672
 673   return EXCEPTION_CONTINUE_EXECUTION;
 674 }
 675
 676 #endif
 677
 678 static void
 679 main_init ()
 680 {
 681   INIT_SEGV;
 682 #ifdef HANDLE_FPE
 683   INIT_FPE;
 684 #else
 685   arithexception = new java::lang::ArithmeticException
 686     (JvNewStringLatin1 ("/ by zero"));
 687 #endif
 688
 689   no_memory = new java::lang::OutOfMemoryError;
 690
 691 #ifdef USE_LTDL
 692   LTDL_SET_PRELOADED_SYMBOLS ();
 693 #endif
 694
 695 #ifdef USE_WINSOCK
 696   // Initialise winsock for networking
 697   WSADATA data;
 698   if (WSAStartup (MAKEWORD (1, 1), &data))
 699       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 700 #endif /* USE_WINSOCK */
 701
 702 #ifdef USE_WIN32_SIGNALLING
 703   // Install exception handler
 704   SetUnhandledExceptionFilter (win32_exception_handler);
 705 #else
 706   // We only want this on POSIX systems.
 707   struct sigaction act;
 708   act.sa_handler = SIG_IGN;
 709   sigemptyset (&act.sa_mask);
 710   act.sa_flags = 0;
 711   sigaction (SIGPIPE, &act, NULL);
 712 #endif /* USE_WIN32_SIGNALLING */
 713
 714   _Jv_JNI_Init ();
 715 }
 716
 717 #ifndef DISABLE_GETENV_PROPERTIES
 718
 719 static char *
 720 next_property_key (char *s, size_t *length)
 721 {
 722   size_t l = 0;
 723
 724   JvAssert (s);
 725
 726   // Skip over whitespace
 727   while (isspace (*s))
 728     s++;
 729
 730   // If we've reached the end, return NULL.  Also return NULL if for
 731   // some reason we've come across a malformed property string.
 732   if (*s == 0
 733       || *s == ':'
 734       || *s == '=')
 735     return NULL;
 736
 737   // Determine the length of the property key.
 738   while (s[l] != 0
 739          && ! isspace (s[l])
 740          && s[l] != ':'
 741          && s[l] != '=')
 742     {
 743       if (s[l] == '\\'
 744           && s[l+1] != 0)
 745         l++;
 746       l++;
 747     }
 748
 749   *length = l;
 750
 751   return s;
 752 }
 753
 754 static char *
 755 next_property_value (char *s, size_t *length)
 756 {
 757   size_t l = 0;
 758
 759   JvAssert (s);
 760
 761   while (isspace (*s))
 762     s++;
 763
 764   if (*s == ':'
 765       || *s == '=')
 766     s++;
 767
 768   while (isspace (*s))
 769     s++;
 770
 771   // If we've reached the end, return NULL.
 772   if (*s == 0)
 773     return NULL;
 774
 775   // Determine the length of the property value.
 776   while (s[l] != 0
 777          && ! isspace (s[l])
 778          && s[l] != ':'
 779          && s[l] != '=')
 780     {
 781       if (s[l] == '\\'
 782           && s[l+1] != 0)
 783         l += 2;
 784       else
 785         l++;
 786     }
 787
 788   *length = l;
 789
 790   return s;
 791 }
 792
 793 static void
 794 process_gcj_properties ()
 795 {
 796   char *props = getenv("GCJ_PROPERTIES");
 797   char *p = props;
 798   size_t length;
 799   size_t property_count = 0;
 800
 801   if (NULL == props)
 802     return;
 803
 804   // Whip through props quickly in order to count the number of
 805   // property values.
 806   while (p && (p = next_property_key (p, &length)))
 807     {
 808       // Skip to the end of the key
 809       p += length;
 810
 811       p = next_property_value (p, &length);
 812       if (p)
 813         p += length;
 814
 815       property_count++;
 816     }
 817
 818   // Allocate an array of property value/key pairs.
 819   _Jv_Environment_Properties =
 820     (property_pair *) malloc (sizeof(property_pair)
 821                               * (property_count + 1));
 822
 823   // Go through the properties again, initializing _Jv_Properties
 824   // along the way.
 825   p = props;
 826   property_count = 0;
 827   while (p && (p = next_property_key (p, &length)))
 828     {
 829       _Jv_Environment_Properties[property_count].key = p;
 830       _Jv_Environment_Properties[property_count].key_length = length;
 831
 832       // Skip to the end of the key
 833       p += length;
 834
 835       p = next_property_value (p, &length);
 836
 837       _Jv_Environment_Properties[property_count].value = p;
 838       _Jv_Environment_Properties[property_count].value_length = length;
 839
 840       if (p)
 841         p += length;
 842
 843       property_count++;
 844     }
 845   memset ((void *) &_Jv_Environment_Properties[property_count],
 846           0, sizeof (property_pair));
 847   {
 848     size_t i = 0;
 849
 850     // Null terminate the strings.
 851     while (_Jv_Environment_Properties[i].key)
 852       {
 853         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 854         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 855       }
 856   }
 857 }
 858 #endif // DISABLE_GETENV_PROPERTIES
 859
 860 void
 861 JvRunMain (jclass klass, int argc, const char **argv)
 862 {
 863   PROCESS_GCJ_PROPERTIES;
 864
 865   main_init ();
 866 #ifdef HAVE_PROC_SELF_EXE
 867   char exec_name[20];
 868   sprintf (exec_name, "/proc/%d/exe", getpid ());
 869   _Jv_ThisExecutable (exec_name);
 870 #else
 871   _Jv_ThisExecutable (argv[0]);
 872 #endif
 873
 874   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 875   main_group = new java::lang::ThreadGroup (23);
 876   main_thread = new gnu::gcj::runtime::FirstThread (main_group,
 877                                                     klass, arg_vec);
 878
 879   main_thread->start();
 880   _Jv_ThreadWait ();
 881
 882   java::lang::Runtime::getRuntime ()->exit (0);
 883 }
 884
 885 void
 886 _Jv_RunMain (const char *class_name, int argc, const char **argv)
 887 {
 888   PROCESS_GCJ_PROPERTIES;
 889
 890   main_init ();
 891
 892 #ifdef HAVE_PROC_SELF_EXE
 893   char exec_name[20];
 894   sprintf (exec_name, "/proc/%d/exe", getpid ());
 895   _Jv_ThisExecutable (exec_name);
 896 #endif
 897
 898   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 899   main_group = new java::lang::ThreadGroup (23);
 900   main_thread = new gnu::gcj::runtime::FirstThread (main_group,
 901                                                     JvNewStringLatin1 (class_name),
 902                                                     arg_vec);
 903   main_thread->start();
 904   _Jv_ThreadWait ();
 905
 906   java::lang::Runtime::getRuntime ()->exit (0);
 907 }
 908
 909 \f
 910
 911 // Parse a string and return a heap size.
 912 static size_t
 913 parse_heap_size (const char *spec)
 914 {
 915   char *end;
 916   unsigned long val = strtoul (spec, &end, 10);
 917   if (*end == 'k' || *end == 'K')
 918     val *= 1024;
 919   else if (*end == 'm' || *end == 'M')
 920     val *= 1048576;
 921   return (size_t) val;
 922 }
 923
 924 // Set the initial heap size.  This might be ignored by the GC layer.
 925 // This must be called before _Jv_RunMain.
 926 void
 927 _Jv_SetInitialHeapSize (const char *arg)
 928 {
 929   size_t size = parse_heap_size (arg);
 930   _Jv_GCSetInitialHeapSize (size);
 931 }
 932
 933 // Set the maximum heap size.  This might be ignored by the GC layer.
 934 // This must be called before _Jv_RunMain.
 935 void
 936 _Jv_SetMaximumHeapSize (const char *arg)
 937 {
 938   size_t size = parse_heap_size (arg);
 939   _Jv_GCSetMaximumHeapSize (size);
 940 }
 941
 942 \f
 943
 944 void *
 945 _Jv_Malloc (jsize size)
 946 {
 947   if (__builtin_expect (size == 0, false))
 948     size = 1;
 949   void *ptr = malloc ((size_t) size);
 950   if (__builtin_expect (ptr == NULL, false))
 951     JvThrow (no_memory);
 952   return ptr;
 953 }
 954
 955 void *
 956 _Jv_Realloc (void *ptr, jsize size)
 957 {
 958   if (__builtin_expect (size == 0, false))
 959     size = 1;
 960   ptr = realloc (ptr, (size_t) size);
 961   if (__builtin_expect (ptr == NULL, false))
 962     JvThrow (no_memory);
 963   return ptr;
 964 }
 965
 966 void *
 967 _Jv_MallocUnchecked (jsize size)
 968 {
 969   if (__builtin_expect (size == 0, false))
 970     size = 1;
 971   return malloc ((size_t) size);
 972 }
 973
 974 void
 975 _Jv_Free (void* ptr)
 976 {
 977   return free (ptr);
 978 }
 979
 980 \f
 981
 982 // In theory, these routines can be #ifdef'd away on machines which
 983 // support divide overflow signals.  However, we never know if some
 984 // code might have been compiled with "-fuse-divide-subroutine", so we
 985 // always include them in libgcj.
 986
 987 jint
 988 _Jv_divI (jint dividend, jint divisor)
 989 {
 990   if (__builtin_expect (divisor == 0, false))
 991     _Jv_ThrowSignal (arithexception);
 992
 993   if (dividend == (jint) 0x80000000L && divisor == -1)
 994     return dividend;
 995
 996   return dividend / divisor;
 997 }
 998
 999 jint
1000 _Jv_remI (jint dividend, jint divisor)
1001 {
1002   if (__builtin_expect (divisor == 0, false))
1003     _Jv_ThrowSignal (arithexception);
1004
1005   if (dividend == (jint) 0x80000000L && divisor == -1)
1006     return 0;
1007
1008   return dividend % divisor;
1009 }
1010
1011 jlong
1012 _Jv_divJ (jlong dividend, jlong divisor)
1013 {
1014   if (__builtin_expect (divisor == 0, false))
1015     _Jv_ThrowSignal (arithexception);
1016
1017   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1018     return dividend;
1019
1020   return dividend / divisor;
1021 }
1022
1023 jlong
1024 _Jv_remJ (jlong dividend, jlong divisor)
1025 {
1026   if (__builtin_expect (divisor == 0, false))
1027     _Jv_ThrowSignal (arithexception);
1028
1029   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1030     return 0;
1031
1032   return dividend % divisor;
1033 }