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