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, jobject array_vtable)
 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_DONE;
 547       thread = NULL;
 548
 549       // Note that we have to set `methods' to NULL.
 550       if (sig != 'V')
 551         _Jv_FindArrayClass (this, NULL, (_Jv_VTable *) array_vtable);
 552     }
 553 };
 554
 555 // We use this to define both primitive classes and the vtables for
 556 // arrays of primitive classes.  The latter are given names so that we
 557 // can refer to them from the compiler, allowing us to construct
 558 // arrays of primitives statically.
 559 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
 560   _Jv_ArrayVTable _Jv_##NAME##VTable; \
 561   _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN, \
 562                                   (jobject) &_Jv_##NAME##VTable)
 563
 564 DECLARE_PRIM_TYPE(byte, 'B', 1);
 565 DECLARE_PRIM_TYPE(short, 'S', 2);
 566 DECLARE_PRIM_TYPE(int, 'I', 4);
 567 DECLARE_PRIM_TYPE(long, 'J', 8);
 568 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 569 DECLARE_PRIM_TYPE(char, 'C', 2);
 570 DECLARE_PRIM_TYPE(float, 'F', 4);
 571 DECLARE_PRIM_TYPE(double, 'D', 8);
 572 DECLARE_PRIM_TYPE(void, 'V', 0);
 573
 574 jclass
 575 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 576 {
 577   switch (*sig)
 578     {
 579     case 'B':
 580       return JvPrimClass (byte);
 581     case 'S':
 582       return JvPrimClass (short);
 583     case 'I':
 584       return JvPrimClass (int);
 585     case 'J':
 586       return JvPrimClass (long);
 587     case 'Z':
 588       return JvPrimClass (boolean);
 589     case 'C':
 590       return JvPrimClass (char);
 591     case 'F':
 592       return JvPrimClass (float);
 593     case 'D':
 594       return JvPrimClass (double);
 595     case 'V':
 596       return JvPrimClass (void);
 597     case 'L':
 598       {
 599         int i;
 600         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 601           ;
 602         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 603         return _Jv_FindClass (name, loader);
 604
 605       }
 606     case '[':
 607       return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
 608                                  loader);
 609     }
 610   JvFail ("couldn't understand class signature");
 611   return NULL;                  // Placate compiler.
 612 }
 613
 614 \f
 615
 616 JArray<jstring> *
 617 JvConvertArgv (int argc, const char **argv)
 618 {
 619   if (argc < 0)
 620     argc = 0;
 621   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 622   jobject* ptr = elements(ar);
 623   for (int i = 0;  i < argc;  i++)
 624     {
 625       const char *arg = argv[i];
 626       // FIXME - should probably use JvNewStringUTF.
 627       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 628     }
 629   return (JArray<jstring>*) ar;
 630 }
 631
 632 // FIXME: These variables are static so that they will be
 633 // automatically scanned by the Boehm collector.  This is needed
 634 // because with qthreads the collector won't scan the initial stack --
 635 // it will only scan the qthreads stacks.
 636
 637 // Command line arguments.
 638 static jobject arg_vec;
 639
 640 // The primary threadgroup.
 641 static java::lang::ThreadGroup *main_group;
 642
 643 // The primary thread.
 644 static java::lang::Thread *main_thread;
 645
 646 char *
 647 _Jv_ThisExecutable (void)
 648 {
 649   return _Jv_execName;
 650 }
 651
 652 void
 653 _Jv_ThisExecutable (const char *name)
 654 {
 655   if (name)
 656     {
 657       _Jv_execName = new char[strlen (name) + 1];
 658       strcpy (_Jv_execName, name);
 659     }
 660 }
 661
 662 #ifdef USE_WIN32_SIGNALLING
 663
 664 extern "C" int* win32_get_restart_frame (void *);
 665
 666 LONG CALLBACK
 667 win32_exception_handler (LPEXCEPTION_POINTERS e)
 668 {
 669   int* setjmp_buf;
 670   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 671     setjmp_buf = win32_get_restart_frame (nullp);
 672   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 673     setjmp_buf = win32_get_restart_frame (arithexception);
 674   else
 675     return EXCEPTION_CONTINUE_SEARCH;
 676
 677   e->ContextRecord->Ebp = setjmp_buf[0];
 678   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 679   e->ContextRecord->Eip = setjmp_buf[1];
 680   // FIXME: Is this the stack pointer? Do we need it?
 681   e->ContextRecord->Esp = setjmp_buf[2];
 682
 683   return EXCEPTION_CONTINUE_EXECUTION;
 684 }
 685
 686 #endif
 687
 688 static void
 689 main_init ()
 690 {
 691   INIT_SEGV;
 692 #ifdef HANDLE_FPE
 693   INIT_FPE;
 694 #else
 695   arithexception = new java::lang::ArithmeticException
 696     (JvNewStringLatin1 ("/ by zero"));
 697 #endif
 698
 699   no_memory = new java::lang::OutOfMemoryError;
 700
 701 #ifdef USE_LTDL
 702   LTDL_SET_PRELOADED_SYMBOLS ();
 703 #endif
 704
 705 #ifdef USE_WINSOCK
 706   // Initialise winsock for networking
 707   WSADATA data;
 708   if (WSAStartup (MAKEWORD (1, 1), &data))
 709       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 710 #endif /* USE_WINSOCK */
 711
 712 #ifdef USE_WIN32_SIGNALLING
 713   // Install exception handler
 714   SetUnhandledExceptionFilter (win32_exception_handler);
 715 #else
 716   // We only want this on POSIX systems.
 717   struct sigaction act;
 718   act.sa_handler = SIG_IGN;
 719   sigemptyset (&act.sa_mask);
 720   act.sa_flags = 0;
 721   sigaction (SIGPIPE, &act, NULL);
 722 #endif /* USE_WIN32_SIGNALLING */
 723
 724   _Jv_JNI_Init ();
 725 }
 726
 727 #ifndef DISABLE_GETENV_PROPERTIES
 728
 729 static char *
 730 next_property_key (char *s, size_t *length)
 731 {
 732   size_t l = 0;
 733
 734   JvAssert (s);
 735
 736   // Skip over whitespace
 737   while (isspace (*s))
 738     s++;
 739
 740   // If we've reached the end, return NULL.  Also return NULL if for
 741   // some reason we've come across a malformed property string.
 742   if (*s == 0
 743       || *s == ':'
 744       || *s == '=')
 745     return NULL;
 746
 747   // Determine the length of the property key.
 748   while (s[l] != 0
 749          && ! isspace (s[l])
 750          && s[l] != ':'
 751          && s[l] != '=')
 752     {
 753       if (s[l] == '\\'
 754           && s[l+1] != 0)
 755         l++;
 756       l++;
 757     }
 758
 759   *length = l;
 760
 761   return s;
 762 }
 763
 764 static char *
 765 next_property_value (char *s, size_t *length)
 766 {
 767   size_t l = 0;
 768
 769   JvAssert (s);
 770
 771   while (isspace (*s))
 772     s++;
 773
 774   if (*s == ':'
 775       || *s == '=')
 776     s++;
 777
 778   while (isspace (*s))
 779     s++;
 780
 781   // If we've reached the end, return NULL.
 782   if (*s == 0)
 783     return NULL;
 784
 785   // Determine the length of the property value.
 786   while (s[l] != 0
 787          && ! isspace (s[l])
 788          && s[l] != ':'
 789          && s[l] != '=')
 790     {
 791       if (s[l] == '\\'
 792           && s[l+1] != 0)
 793         l += 2;
 794       else
 795         l++;
 796     }
 797
 798   *length = l;
 799
 800   return s;
 801 }
 802
 803 static void
 804 process_gcj_properties ()
 805 {
 806   char *props = getenv("GCJ_PROPERTIES");
 807   char *p = props;
 808   size_t length;
 809   size_t property_count = 0;
 810
 811   if (NULL == props)
 812     return;
 813
 814   // Whip through props quickly in order to count the number of
 815   // property values.
 816   while (p && (p = next_property_key (p, &length)))
 817     {
 818       // Skip to the end of the key
 819       p += length;
 820
 821       p = next_property_value (p, &length);
 822       if (p)
 823         p += length;
 824
 825       property_count++;
 826     }
 827
 828   // Allocate an array of property value/key pairs.
 829   _Jv_Environment_Properties =
 830     (property_pair *) malloc (sizeof(property_pair)
 831                               * (property_count + 1));
 832
 833   // Go through the properties again, initializing _Jv_Properties
 834   // along the way.
 835   p = props;
 836   property_count = 0;
 837   while (p && (p = next_property_key (p, &length)))
 838     {
 839       _Jv_Environment_Properties[property_count].key = p;
 840       _Jv_Environment_Properties[property_count].key_length = length;
 841
 842       // Skip to the end of the key
 843       p += length;
 844
 845       p = next_property_value (p, &length);
 846
 847       _Jv_Environment_Properties[property_count].value = p;
 848       _Jv_Environment_Properties[property_count].value_length = length;
 849
 850       if (p)
 851         p += length;
 852
 853       property_count++;
 854     }
 855   memset ((void *) &_Jv_Environment_Properties[property_count],
 856           0, sizeof (property_pair));
 857   {
 858     size_t i = 0;
 859
 860     // Null terminate the strings.
 861     while (_Jv_Environment_Properties[i].key)
 862       {
 863         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 864         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 865       }
 866   }
 867 }
 868 #endif // DISABLE_GETENV_PROPERTIES
 869
 870 void
 871 JvRunMain (jclass klass, int argc, const char **argv)
 872 {
 873   PROCESS_GCJ_PROPERTIES;
 874
 875   main_init ();
 876 #ifdef HAVE_PROC_SELF_EXE
 877   char exec_name[20];
 878   sprintf (exec_name, "/proc/%d/exe", getpid ());
 879   _Jv_ThisExecutable (exec_name);
 880 #else
 881   _Jv_ThisExecutable (argv[0]);
 882 #endif
 883
 884   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 885   main_group = new java::lang::ThreadGroup (23);
 886   main_thread = new gnu::gcj::runtime::FirstThread (main_group,
 887                                                     klass, arg_vec);
 888
 889   main_thread->start();
 890   _Jv_ThreadWait ();
 891
 892   java::lang::Runtime::getRuntime ()->exit (0);
 893 }
 894
 895 void
 896 _Jv_RunMain (const char *class_name, int argc, const char **argv)
 897 {
 898   PROCESS_GCJ_PROPERTIES;
 899
 900   main_init ();
 901
 902 #ifdef HAVE_PROC_SELF_EXE
 903   char exec_name[20];
 904   sprintf (exec_name, "/proc/%d/exe", getpid ());
 905   _Jv_ThisExecutable (exec_name);
 906 #endif
 907
 908   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 909   main_group = new java::lang::ThreadGroup (23);
 910   main_thread = new gnu::gcj::runtime::FirstThread (main_group,
 911                                                     JvNewStringLatin1 (class_name),
 912                                                     arg_vec);
 913   main_thread->start();
 914   _Jv_ThreadWait ();
 915
 916   java::lang::Runtime::getRuntime ()->exit (0);
 917 }
 918
 919 \f
 920
 921 // Parse a string and return a heap size.
 922 static size_t
 923 parse_heap_size (const char *spec)
 924 {
 925   char *end;
 926   unsigned long val = strtoul (spec, &end, 10);
 927   if (*end == 'k' || *end == 'K')
 928     val *= 1024;
 929   else if (*end == 'm' || *end == 'M')
 930     val *= 1048576;
 931   return (size_t) val;
 932 }
 933
 934 // Set the initial heap size.  This might be ignored by the GC layer.
 935 // This must be called before _Jv_RunMain.
 936 void
 937 _Jv_SetInitialHeapSize (const char *arg)
 938 {
 939   size_t size = parse_heap_size (arg);
 940   _Jv_GCSetInitialHeapSize (size);
 941 }
 942
 943 // Set the maximum heap size.  This might be ignored by the GC layer.
 944 // This must be called before _Jv_RunMain.
 945 void
 946 _Jv_SetMaximumHeapSize (const char *arg)
 947 {
 948   size_t size = parse_heap_size (arg);
 949   _Jv_GCSetMaximumHeapSize (size);
 950 }
 951
 952 \f
 953
 954 void *
 955 _Jv_Malloc (jsize size)
 956 {
 957   if (__builtin_expect (size == 0, false))
 958     size = 1;
 959   void *ptr = malloc ((size_t) size);
 960   if (__builtin_expect (ptr == NULL, false))
 961     JvThrow (no_memory);
 962   return ptr;
 963 }
 964
 965 void *
 966 _Jv_Realloc (void *ptr, jsize size)
 967 {
 968   if (__builtin_expect (size == 0, false))
 969     size = 1;
 970   ptr = realloc (ptr, (size_t) size);
 971   if (__builtin_expect (ptr == NULL, false))
 972     JvThrow (no_memory);
 973   return ptr;
 974 }
 975
 976 void *
 977 _Jv_MallocUnchecked (jsize size)
 978 {
 979   if (__builtin_expect (size == 0, false))
 980     size = 1;
 981   return malloc ((size_t) size);
 982 }
 983
 984 void
 985 _Jv_Free (void* ptr)
 986 {
 987   return free (ptr);
 988 }
 989
 990 \f
 991
 992 // In theory, these routines can be #ifdef'd away on machines which
 993 // support divide overflow signals.  However, we never know if some
 994 // code might have been compiled with "-fuse-divide-subroutine", so we
 995 // always include them in libgcj.
 996
 997 jint
 998 _Jv_divI (jint dividend, jint divisor)
 999 {
1000   if (__builtin_expect (divisor == 0, false))
1001     _Jv_ThrowSignal (arithexception);
1002
1003   if (dividend == (jint) 0x80000000L && divisor == -1)
1004     return dividend;
1005
1006   return dividend / divisor;
1007 }
1008
1009 jint
1010 _Jv_remI (jint dividend, jint divisor)
1011 {
1012   if (__builtin_expect (divisor == 0, false))
1013     _Jv_ThrowSignal (arithexception);
1014
1015   if (dividend == (jint) 0x80000000L && divisor == -1)
1016     return 0;
1017
1018   return dividend % divisor;
1019 }
1020
1021 jlong
1022 _Jv_divJ (jlong dividend, jlong divisor)
1023 {
1024   if (__builtin_expect (divisor == 0, false))
1025     _Jv_ThrowSignal (arithexception);
1026
1027   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1028     return dividend;
1029
1030   return dividend / divisor;
1031 }
1032
1033 jlong
1034 _Jv_remJ (jlong dividend, jlong divisor)
1035 {
1036   if (__builtin_expect (divisor == 0, false))
1037     _Jv_ThrowSignal (arithexception);
1038
1039   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1040     return 0;
1041
1042   return dividend % divisor;
1043 }