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/ClassLoader.h>
  51 #include <java/lang/Runtime.h>
  52 #include <java/lang/String.h>
  53 #include <java/lang/Thread.h>
  54 #include <java/lang/ThreadGroup.h>
  55 #include <gnu/gcj/runtime/FirstThread.h>
  56 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  57 #include <java/lang/ArithmeticException.h>
  58 #include <java/lang/ClassFormatError.h>
  59 #include <java/lang/NegativeArraySizeException.h>
  60 #include <java/lang/NullPointerException.h>
  61 #include <java/lang/OutOfMemoryError.h>
  62 #include <java/lang/System.h>
  63 #include <java/lang/reflect/Modifier.h>
  64 #include <java/io/PrintStream.h>
  65
  66 #ifdef USE_LTDL
  67 #include <ltdl.h>
  68 #endif
  69
  70 // We allocate a single OutOfMemoryError exception which we keep
  71 // around for use if we run out of memory.
  72 static java::lang::OutOfMemoryError *no_memory;
  73
  74 // Largest representable size_t.
  75 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  76
  77 // Properties set at compile time.
  78 const char **_Jv_Compiler_Properties;
  79
  80 // The JAR file to add to the beginning of java.class.path.
  81 const char *_Jv_Jar_Class_Path;
  82
  83 #ifndef DISABLE_GETENV_PROPERTIES
  84 // Property key/value pairs.
  85 property_pair *_Jv_Environment_Properties;
  86 #endif
  87
  88 // The name of this executable.
  89 static char * _Jv_execName;
  90
  91 // Stash the argv pointer to benefit native libraries that need it.
  92 const char **_Jv_argv;
  93 int _Jv_argc;
  94
  95 #ifdef ENABLE_JVMPI
  96 // Pointer to JVMPI notification functions.
  97 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
  98 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
  99 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 100 #endif
 101 \f
 102
 103 extern "C" void _Jv_ThrowSignal (void *) __attribute ((noreturn));
 104
 105 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 106 // this is declared extern in order that its name not be mangled, it
 107 // is not intended to be used outside this file.
 108 void
 109 _Jv_ThrowSignal (void *e)
 110 {
 111   java::lang::Throwable *throwable = (java::lang::Throwable *)e;
 112   throwable->fillInStackTrace ();
 113   _Jv_Throw (throwable);
 114 }
 115
 116 #ifdef HANDLE_SEGV
 117 static java::lang::NullPointerException *nullp;
 118
 119 SIGNAL_HANDLER (catch_segv)
 120 {
 121   MAKE_THROW_FRAME (nullp);
 122   _Jv_ThrowSignal (nullp);
 123 }
 124 #endif
 125
 126 static java::lang::ArithmeticException *arithexception;
 127
 128 #ifdef HANDLE_FPE
 129 SIGNAL_HANDLER (catch_fpe)
 130 {
 131 #ifdef HANDLE_DIVIDE_OVERFLOW
 132   HANDLE_DIVIDE_OVERFLOW;
 133 #else
 134   MAKE_THROW_FRAME (arithexception);
 135 #endif
 136   _Jv_ThrowSignal (arithexception);
 137 }
 138 #endif
 139
 140 \f
 141
 142 jboolean
 143 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 144 {
 145   int len;
 146   _Jv_ushort *aptr, *bptr;
 147   if (a == b)
 148     return true;
 149   if (a->hash != b->hash)
 150     return false;
 151   len = a->length;
 152   if (b->length != len)
 153     return false;
 154   aptr = (_Jv_ushort *)a->data;
 155   bptr = (_Jv_ushort *)b->data;
 156   len = (len + 1) >> 1;
 157   while (--len >= 0)
 158     if (*aptr++ != *bptr++)
 159       return false;
 160   return true;
 161 }
 162
 163 /* True iff A is equal to STR.
 164    HASH is STR->hashCode().
 165 */
 166
 167 jboolean
 168 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 169 {
 170   if (a->hash != (_Jv_ushort) hash)
 171     return false;
 172   jint len = str->length();
 173   jint i = 0;
 174   jchar *sptr = _Jv_GetStringChars (str);
 175   unsigned char* ptr = (unsigned char*) a->data;
 176   unsigned char* limit = ptr + a->length;
 177   for (;; i++, sptr++)
 178     {
 179       int ch = UTF8_GET (ptr, limit);
 180       if (i == len)
 181         return ch < 0;
 182       if (ch != *sptr)
 183         return false;
 184     }
 185   return true;
 186 }
 187
 188 /* Like _Jv_equal, but stop after N characters.  */
 189 jboolean
 190 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 191 {
 192   jint len = str->length();
 193   jint i = 0;
 194   jchar *sptr = _Jv_GetStringChars (str);
 195   unsigned char* ptr = (unsigned char*) a->data;
 196   unsigned char* limit = ptr + a->length;
 197   for (; n-- > 0; i++, sptr++)
 198     {
 199       int ch = UTF8_GET (ptr, limit);
 200       if (i == len)
 201         return ch < 0;
 202       if (ch != *sptr)
 203         return false;
 204     }
 205   return true;
 206 }
 207
 208 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 209 int
 210 _Jv_strLengthUtf8(char* str, int len)
 211 {
 212   unsigned char* ptr;
 213   unsigned char* limit;
 214   int str_length;
 215
 216   ptr = (unsigned char*) str;
 217   limit = ptr + len;
 218   str_length = 0;
 219   for (; ptr < limit; str_length++) {
 220     if (UTF8_GET (ptr, limit) < 0) {
 221       return (-1);
 222     }
 223   }
 224   return (str_length);
 225 }
 226
 227 /* Calculate a hash value for a string encoded in Utf8 format.
 228  * This returns the same hash value as specified or java.lang.String.hashCode.
 229  */
 230 static jint
 231 hashUtf8String (char* str, int len)
 232 {
 233   unsigned char* ptr = (unsigned char*) str;
 234   unsigned char* limit = ptr + len;
 235   jint hash = 0;
 236
 237   for (; ptr < limit;)
 238     {
 239       int ch = UTF8_GET (ptr, limit);
 240       /* Updated specification from
 241          http://www.javasoft.com/docs/books/jls/clarify.html. */
 242       hash = (31 * hash) + ch;
 243     }
 244   return hash;
 245 }
 246
 247 _Jv_Utf8Const *
 248 _Jv_makeUtf8Const (char* s, int len)
 249 {
 250   if (len < 0)
 251     len = strlen (s);
 252   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 253   if (! m)
 254     JvThrow (no_memory);
 255   memcpy (m->data, s, len);
 256   m->data[len] = 0;
 257   m->length = len;
 258   m->hash = hashUtf8String (s, len) & 0xFFFF;
 259   return (m);
 260 }
 261
 262 _Jv_Utf8Const *
 263 _Jv_makeUtf8Const (jstring string)
 264 {
 265   jint hash = string->hashCode ();
 266   jint len = _Jv_GetStringUTFLength (string);
 267
 268   Utf8Const* m = (Utf8Const*)
 269     _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
 270
 271   m->hash = hash;
 272   m->length = len;
 273
 274   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 275   m->data[len] = 0;
 276
 277   return m;
 278 }
 279
 280 \f
 281
 282 #ifdef DEBUG
 283 void
 284 _Jv_Abort (const char *function, const char *file, int line,
 285            const char *message)
 286 #else
 287 void
 288 _Jv_Abort (const char *, const char *, int, const char *message)
 289 #endif
 290 {
 291 #ifdef DEBUG
 292   fprintf (stderr,
 293            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 294            message, function, file, line);
 295 #else
 296   java::io::PrintStream *err = java::lang::System::err;
 297   err->print(JvNewStringLatin1 ("libgcj failure: "));
 298   err->println(JvNewStringLatin1 (message));
 299   err->flush();
 300 #endif
 301   abort ();
 302 }
 303
 304 static void
 305 fail_on_finalization (jobject)
 306 {
 307   JvFail ("object was finalized");
 308 }
 309
 310 void
 311 _Jv_GCWatch (jobject obj)
 312 {
 313   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 314 }
 315
 316 void
 317 _Jv_ThrowBadArrayIndex(jint bad_index)
 318 {
 319   JvThrow (new java::lang::ArrayIndexOutOfBoundsException
 320            (java::lang::String::valueOf(bad_index)));
 321 }
 322
 323 void
 324 _Jv_ThrowNullPointerException ()
 325 {
 326   throw new java::lang::NullPointerException ();
 327 }
 328
 329 // Allocate some unscanned memory and throw an exception if no memory.
 330 void *
 331 _Jv_AllocBytesChecked (jsize size)
 332 {
 333   void *r = _Jv_AllocBytes (size);
 334   if (! r)
 335     _Jv_Throw (no_memory);
 336   return r;
 337 }
 338
 339 // Allocate a new object of class KLASS.  SIZE is the size of the object
 340 // to allocate.  You might think this is redundant, but it isn't; some
 341 // classes, such as String, aren't of fixed size.
 342 jobject
 343 _Jv_AllocObject (jclass klass, jint size)
 344 {
 345   _Jv_InitClass (klass);
 346
 347   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 348   if (__builtin_expect (! obj, false))
 349     JvThrow (no_memory);
 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       _Jv_DisableGC ();
 378       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 379       _Jv_EnableGC ();
 380     }
 381 #endif
 382
 383   return obj;
 384 }
 385
 386 // Allocate a new array of Java objects.  Each object is of type
 387 // `elementClass'.  `init' is used to initialize each slot in the
 388 // array.
 389 jobjectArray
 390 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 391 {
 392   if (__builtin_expect (count < 0, false))
 393     JvThrow (new java::lang::NegativeArraySizeException);
 394
 395   JvAssert (! elementClass->isPrimitive ());
 396
 397   jobjectArray obj = NULL;
 398   size_t size = (size_t) _Jv_GetArrayElementFromElementType (obj,
 399                                                              elementClass);
 400
 401   // Check for overflow.
 402   if (__builtin_expect ((size_t) count >
 403                         (SIZE_T_MAX - size) / sizeof (jobject), false))
 404     JvThrow (no_memory);
 405
 406   size += count * sizeof (jobject);
 407
 408   // FIXME: second argument should be "current loader" //
 409   jclass klass = _Jv_FindArrayClass (elementClass, 0);
 410
 411   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 412   if (__builtin_expect (! obj, false))
 413     JvThrow (no_memory);
 414   // Cast away const.
 415   jsize *lp = const_cast<jsize *> (&obj->length);
 416   *lp = count;
 417   jobject *ptr = elements(obj);
 418   // We know the allocator returns zeroed memory.  So don't bother
 419   // zeroing it again.
 420   if (init)
 421     {
 422       while (--count >= 0)
 423         *ptr++ = init;
 424     }
 425   return obj;
 426 }
 427
 428 // Allocate a new array of primitives.  ELTYPE is the type of the
 429 // element, COUNT is the size of the array.
 430 jobject
 431 _Jv_NewPrimArray (jclass eltype, jint count)
 432 {
 433   int elsize = eltype->size();
 434   if (__builtin_expect (count < 0, false))
 435     JvThrow (new java::lang::NegativeArraySizeException ());
 436
 437   JvAssert (eltype->isPrimitive ());
 438   jobject dummy = NULL;
 439   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 440
 441   // Check for overflow.
 442   if (__builtin_expect ((size_t) count >
 443                         (SIZE_T_MAX - size) / elsize, false))
 444     JvThrow (no_memory);
 445
 446   jclass klass = _Jv_FindArrayClass (eltype, 0);
 447
 448   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 449   if (__builtin_expect (! arr, false))
 450     JvThrow (no_memory);
 451   // Cast away const.
 452   jsize *lp = const_cast<jsize *> (&arr->length);
 453   *lp = count;
 454   // Note that we assume we are given zeroed memory by the allocator.
 455
 456   return arr;
 457 }
 458
 459 jobject
 460 _Jv_NewArray (jint type, jint size)
 461 {
 462   switch (type)
 463     {
 464       case  4:  return JvNewBooleanArray (size);
 465       case  5:  return JvNewCharArray (size);
 466       case  6:  return JvNewFloatArray (size);
 467       case  7:  return JvNewDoubleArray (size);
 468       case  8:  return JvNewByteArray (size);
 469       case  9:  return JvNewShortArray (size);
 470       case 10:  return JvNewIntArray (size);
 471       case 11:  return JvNewLongArray (size);
 472     }
 473   JvFail ("newarray - bad type code");
 474   return NULL;                  // Placate compiler.
 475 }
 476
 477 jobject
 478 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 479 {
 480   JvAssert (type->isArray());
 481   jclass element_type = type->getComponentType();
 482   jobject result;
 483   if (element_type->isPrimitive())
 484     result = _Jv_NewPrimArray (element_type, sizes[0]);
 485   else
 486     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 487
 488   if (dimensions > 1)
 489     {
 490       JvAssert (! element_type->isPrimitive());
 491       JvAssert (element_type->isArray());
 492       jobject *contents = elements ((jobjectArray) result);
 493       for (int i = 0; i < sizes[0]; ++i)
 494         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 495                                          sizes + 1);
 496     }
 497
 498   return result;
 499 }
 500
 501 jobject
 502 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 503 {
 504   va_list args;
 505   jint sizes[dimensions];
 506   va_start (args, dimensions);
 507   for (int i = 0; i < dimensions; ++i)
 508     {
 509       jint size = va_arg (args, jint);
 510       sizes[i] = size;
 511     }
 512   va_end (args);
 513
 514   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 515 }
 516
 517 \f
 518
 519 class _Jv_PrimClass : public java::lang::Class
 520 {
 521 public:
 522   // FIXME: calling convention is weird.  If we use the natural types
 523   // then the compiler will complain because they aren't Java types.
 524   _Jv_PrimClass (jobject cname, jbyte sig, jint len, jobject array_vtable)
 525     {
 526       using namespace java::lang::reflect;
 527
 528       // We must initialize every field of the class.  We do this in
 529       // the same order they are declared in Class.h.
 530       next = NULL;
 531       name = _Jv_makeUtf8Const ((char *) cname, -1);
 532       accflags = Modifier::PUBLIC | Modifier::FINAL;
 533       superclass = NULL;
 534       constants.size = 0;
 535       constants.tags = NULL;
 536       constants.data = NULL;
 537       methods = NULL;
 538       method_count = sig;
 539       vtable_method_count = 0;
 540       fields = NULL;
 541       size_in_bytes = len;
 542       field_count = 0;
 543       static_field_count = 0;
 544       vtable = JV_PRIMITIVE_VTABLE;
 545       interfaces = NULL;
 546       loader = NULL;
 547       interface_count = 0;
 548       state = JV_STATE_DONE;
 549       thread = NULL;
 550
 551       // Note that we have to set `methods' to NULL.
 552       if (sig != 'V')
 553         _Jv_FindArrayClass (this, NULL, (_Jv_VTable *) array_vtable);
 554     }
 555 };
 556
 557 // We use this to define both primitive classes and the vtables for
 558 // arrays of primitive classes.  The latter are given names so that we
 559 // can refer to them from the compiler, allowing us to construct
 560 // arrays of primitives statically.
 561 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
 562   _Jv_ArrayVTable _Jv_##NAME##VTable; \
 563   _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN, \
 564                                   (jobject) &_Jv_##NAME##VTable)
 565
 566 DECLARE_PRIM_TYPE(byte, 'B', 1);
 567 DECLARE_PRIM_TYPE(short, 'S', 2);
 568 DECLARE_PRIM_TYPE(int, 'I', 4);
 569 DECLARE_PRIM_TYPE(long, 'J', 8);
 570 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 571 DECLARE_PRIM_TYPE(char, 'C', 2);
 572 DECLARE_PRIM_TYPE(float, 'F', 4);
 573 DECLARE_PRIM_TYPE(double, 'D', 8);
 574 DECLARE_PRIM_TYPE(void, 'V', 0);
 575
 576 jclass
 577 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 578 {
 579   switch (*sig)
 580     {
 581     case 'B':
 582       return JvPrimClass (byte);
 583     case 'S':
 584       return JvPrimClass (short);
 585     case 'I':
 586       return JvPrimClass (int);
 587     case 'J':
 588       return JvPrimClass (long);
 589     case 'Z':
 590       return JvPrimClass (boolean);
 591     case 'C':
 592       return JvPrimClass (char);
 593     case 'F':
 594       return JvPrimClass (float);
 595     case 'D':
 596       return JvPrimClass (double);
 597     case 'V':
 598       return JvPrimClass (void);
 599     case 'L':
 600       {
 601         int i;
 602         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 603           ;
 604         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 605         return _Jv_FindClass (name, loader);
 606
 607       }
 608     case '[':
 609       return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
 610                                  loader);
 611     }
 612   JvFail ("couldn't understand class signature");
 613   return NULL;                  // Placate compiler.
 614 }
 615
 616 \f
 617
 618 JArray<jstring> *
 619 JvConvertArgv (int argc, const char **argv)
 620 {
 621   if (argc < 0)
 622     argc = 0;
 623   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 624   jobject* ptr = elements(ar);
 625   for (int i = 0;  i < argc;  i++)
 626     {
 627       const char *arg = argv[i];
 628       // FIXME - should probably use JvNewStringUTF.
 629       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 630     }
 631   return (JArray<jstring>*) ar;
 632 }
 633
 634 // FIXME: These variables are static so that they will be
 635 // automatically scanned by the Boehm collector.  This is needed
 636 // because with qthreads the collector won't scan the initial stack --
 637 // it will only scan the qthreads stacks.
 638
 639 // Command line arguments.
 640 static jobject arg_vec;
 641
 642 // The primary thread.
 643 static java::lang::Thread *main_thread;
 644
 645 char *
 646 _Jv_ThisExecutable (void)
 647 {
 648   return _Jv_execName;
 649 }
 650
 651 void
 652 _Jv_ThisExecutable (const char *name)
 653 {
 654   if (name)
 655     {
 656       _Jv_execName = new char[strlen (name) + 1];
 657       strcpy (_Jv_execName, name);
 658     }
 659 }
 660
 661 #ifdef USE_WIN32_SIGNALLING
 662
 663 extern "C" int* win32_get_restart_frame (void *);
 664
 665 LONG CALLBACK
 666 win32_exception_handler (LPEXCEPTION_POINTERS e)
 667 {
 668   int* setjmp_buf;
 669   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 670     setjmp_buf = win32_get_restart_frame (nullp);
 671   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 672     setjmp_buf = win32_get_restart_frame (arithexception);
 673   else
 674     return EXCEPTION_CONTINUE_SEARCH;
 675
 676   e->ContextRecord->Ebp = setjmp_buf[0];
 677   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 678   e->ContextRecord->Eip = setjmp_buf[1];
 679   // FIXME: Is this the stack pointer? Do we need it?
 680   e->ContextRecord->Esp = setjmp_buf[2];
 681
 682   return EXCEPTION_CONTINUE_EXECUTION;
 683 }
 684
 685 #endif
 686
 687 static void
 688 main_init ()
 689 {
 690   // Turn stack trace generation off while creating exception objects.
 691   _Jv_InitClass (&java::lang::Throwable::class$);
 692   java::lang::Throwable::trace_enabled = 0;
 693
 694   INIT_SEGV;
 695 #ifdef HANDLE_FPE
 696   INIT_FPE;
 697 #else
 698   arithexception = new java::lang::ArithmeticException
 699     (JvNewStringLatin1 ("/ by zero"));
 700 #endif
 701
 702   no_memory = new java::lang::OutOfMemoryError;
 703
 704   java::lang::Throwable::trace_enabled = 1;
 705
 706 #ifdef USE_LTDL
 707   LTDL_SET_PRELOADED_SYMBOLS ();
 708 #endif
 709
 710 #ifdef USE_WINSOCK
 711   // Initialise winsock for networking
 712   WSADATA data;
 713   if (WSAStartup (MAKEWORD (1, 1), &data))
 714       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 715 #endif /* USE_WINSOCK */
 716
 717 #ifdef USE_WIN32_SIGNALLING
 718   // Install exception handler
 719   SetUnhandledExceptionFilter (win32_exception_handler);
 720 #else
 721   // We only want this on POSIX systems.
 722   struct sigaction act;
 723   act.sa_handler = SIG_IGN;
 724   sigemptyset (&act.sa_mask);
 725   act.sa_flags = 0;
 726   sigaction (SIGPIPE, &act, NULL);
 727 #endif /* USE_WIN32_SIGNALLING */
 728
 729   _Jv_JNI_Init ();
 730 }
 731
 732 #ifndef DISABLE_GETENV_PROPERTIES
 733
 734 static char *
 735 next_property_key (char *s, size_t *length)
 736 {
 737   size_t l = 0;
 738
 739   JvAssert (s);
 740
 741   // Skip over whitespace
 742   while (isspace (*s))
 743     s++;
 744
 745   // If we've reached the end, return NULL.  Also return NULL if for
 746   // some reason we've come across a malformed property string.
 747   if (*s == 0
 748       || *s == ':'
 749       || *s == '=')
 750     return NULL;
 751
 752   // Determine the length of the property key.
 753   while (s[l] != 0
 754          && ! isspace (s[l])
 755          && s[l] != ':'
 756          && s[l] != '=')
 757     {
 758       if (s[l] == '\\'
 759           && s[l+1] != 0)
 760         l++;
 761       l++;
 762     }
 763
 764   *length = l;
 765
 766   return s;
 767 }
 768
 769 static char *
 770 next_property_value (char *s, size_t *length)
 771 {
 772   size_t l = 0;
 773
 774   JvAssert (s);
 775
 776   while (isspace (*s))
 777     s++;
 778
 779   if (*s == ':'
 780       || *s == '=')
 781     s++;
 782
 783   while (isspace (*s))
 784     s++;
 785
 786   // If we've reached the end, return NULL.
 787   if (*s == 0)
 788     return NULL;
 789
 790   // Determine the length of the property value.
 791   while (s[l] != 0
 792          && ! isspace (s[l])
 793          && s[l] != ':'
 794          && s[l] != '=')
 795     {
 796       if (s[l] == '\\'
 797           && s[l+1] != 0)
 798         l += 2;
 799       else
 800         l++;
 801     }
 802
 803   *length = l;
 804
 805   return s;
 806 }
 807
 808 static void
 809 process_gcj_properties ()
 810 {
 811   char *props = getenv("GCJ_PROPERTIES");
 812   char *p = props;
 813   size_t length;
 814   size_t property_count = 0;
 815
 816   if (NULL == props)
 817     return;
 818
 819   // Whip through props quickly in order to count the number of
 820   // property values.
 821   while (p && (p = next_property_key (p, &length)))
 822     {
 823       // Skip to the end of the key
 824       p += length;
 825
 826       p = next_property_value (p, &length);
 827       if (p)
 828         p += length;
 829
 830       property_count++;
 831     }
 832
 833   // Allocate an array of property value/key pairs.
 834   _Jv_Environment_Properties =
 835     (property_pair *) malloc (sizeof(property_pair)
 836                               * (property_count + 1));
 837
 838   // Go through the properties again, initializing _Jv_Properties
 839   // along the way.
 840   p = props;
 841   property_count = 0;
 842   while (p && (p = next_property_key (p, &length)))
 843     {
 844       _Jv_Environment_Properties[property_count].key = p;
 845       _Jv_Environment_Properties[property_count].key_length = length;
 846
 847       // Skip to the end of the key
 848       p += length;
 849
 850       p = next_property_value (p, &length);
 851
 852       _Jv_Environment_Properties[property_count].value = p;
 853       _Jv_Environment_Properties[property_count].value_length = length;
 854
 855       if (p)
 856         p += length;
 857
 858       property_count++;
 859     }
 860   memset ((void *) &_Jv_Environment_Properties[property_count],
 861           0, sizeof (property_pair));
 862   {
 863     size_t i = 0;
 864
 865     // Null terminate the strings.
 866     while (_Jv_Environment_Properties[i].key)
 867       {
 868         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 869         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 870       }
 871   }
 872 }
 873 #endif // DISABLE_GETENV_PROPERTIES
 874
 875 void
 876 JvRunMain (jclass klass, int argc, const char **argv)
 877 {
 878   PROCESS_GCJ_PROPERTIES;
 879
 880   _Jv_argv = argv;
 881   _Jv_argc = argc;
 882
 883   main_init ();
 884 #ifdef HAVE_PROC_SELF_EXE
 885   char exec_name[20];
 886   sprintf (exec_name, "/proc/%d/exe", getpid ());
 887   _Jv_ThisExecutable (exec_name);
 888 #else
 889   _Jv_ThisExecutable (argv[0]);
 890 #endif
 891
 892   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 893   main_thread = new gnu::gcj::runtime::FirstThread (klass, arg_vec);
 894
 895   main_thread->start();
 896   _Jv_ThreadWait ();
 897
 898   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 899
 900   java::lang::Runtime::getRuntime ()->exit (status);
 901 }
 902
 903 void
 904 _Jv_RunMain (const char *name, int argc, const char **argv, bool is_jar)
 905 {
 906   jstring class_name;
 907   PROCESS_GCJ_PROPERTIES;
 908
 909   main_init ();
 910
 911 #ifdef HAVE_PROC_SELF_EXE
 912   char exec_name[20];
 913   sprintf (exec_name, "/proc/%d/exe", getpid ());
 914   _Jv_ThisExecutable (exec_name);
 915 #endif
 916
 917   if (is_jar)
 918     {
 919       // name specifies a jar file.  We must now extract the
 920       // Main-Class attribute from the jar's manifest file.  This is
 921       // done by gnu.gcj.runtime.FirstThread.main.
 922       _Jv_Jar_Class_Path = strdup (name);
 923       arg_vec = JvConvertArgv (1, &_Jv_Jar_Class_Path);
 924
 925       main_thread =
 926         new gnu::gcj::runtime::FirstThread (&gnu::gcj::runtime::FirstThread::class$,
 927                                             arg_vec);
 928       main_thread->start();
 929       _Jv_ThreadWait ();
 930
 931       // FirstThread.main extracts the main class name and stores it
 932       // here.
 933       class_name = gnu::gcj::runtime::FirstThread::jarMainClassName;
 934
 935       // We need a new ClassLoader because the classpath must be the
 936       // jar file only.  The easiest way to do this is to lose our
 937       // reference to the previous classloader.
 938       java::lang::ClassLoader::system = NULL;
 939     }
 940   else
 941     class_name = JvNewStringLatin1 (name);
 942
 943   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 944
 945   if (class_name)
 946     {
 947       main_thread = new gnu::gcj::runtime::FirstThread (class_name, arg_vec);
 948       main_thread->start();
 949       _Jv_ThreadWait ();
 950     }
 951
 952   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 953
 954   java::lang::Runtime::getRuntime ()->exit (status);
 955 }
 956
 957 \f
 958
 959 // Parse a string and return a heap size.
 960 static size_t
 961 parse_heap_size (const char *spec)
 962 {
 963   char *end;
 964   unsigned long val = strtoul (spec, &end, 10);
 965   if (*end == 'k' || *end == 'K')
 966     val *= 1024;
 967   else if (*end == 'm' || *end == 'M')
 968     val *= 1048576;
 969   return (size_t) val;
 970 }
 971
 972 // Set the initial heap size.  This might be ignored by the GC layer.
 973 // This must be called before _Jv_RunMain.
 974 void
 975 _Jv_SetInitialHeapSize (const char *arg)
 976 {
 977   size_t size = parse_heap_size (arg);
 978   _Jv_GCSetInitialHeapSize (size);
 979 }
 980
 981 // Set the maximum heap size.  This might be ignored by the GC layer.
 982 // This must be called before _Jv_RunMain.
 983 void
 984 _Jv_SetMaximumHeapSize (const char *arg)
 985 {
 986   size_t size = parse_heap_size (arg);
 987   _Jv_GCSetMaximumHeapSize (size);
 988 }
 989
 990 \f
 991
 992 void *
 993 _Jv_Malloc (jsize size)
 994 {
 995   if (__builtin_expect (size == 0, false))
 996     size = 1;
 997   void *ptr = malloc ((size_t) size);
 998   if (__builtin_expect (ptr == NULL, false))
 999     JvThrow (no_memory);
1000   return ptr;
1001 }
1002
1003 void *
1004 _Jv_Realloc (void *ptr, jsize size)
1005 {
1006   if (__builtin_expect (size == 0, false))
1007     size = 1;
1008   ptr = realloc (ptr, (size_t) size);
1009   if (__builtin_expect (ptr == NULL, false))
1010     JvThrow (no_memory);
1011   return ptr;
1012 }
1013
1014 void *
1015 _Jv_MallocUnchecked (jsize size)
1016 {
1017   if (__builtin_expect (size == 0, false))
1018     size = 1;
1019   return malloc ((size_t) size);
1020 }
1021
1022 void
1023 _Jv_Free (void* ptr)
1024 {
1025   return free (ptr);
1026 }
1027
1028 \f
1029
1030 // In theory, these routines can be #ifdef'd away on machines which
1031 // support divide overflow signals.  However, we never know if some
1032 // code might have been compiled with "-fuse-divide-subroutine", so we
1033 // always include them in libgcj.
1034
1035 jint
1036 _Jv_divI (jint dividend, jint divisor)
1037 {
1038   if (__builtin_expect (divisor == 0, false))
1039     _Jv_ThrowSignal (arithexception);
1040
1041   if (dividend == (jint) 0x80000000L && divisor == -1)
1042     return dividend;
1043
1044   return dividend / divisor;
1045 }
1046
1047 jint
1048 _Jv_remI (jint dividend, jint divisor)
1049 {
1050   if (__builtin_expect (divisor == 0, false))
1051     _Jv_ThrowSignal (arithexception);
1052
1053   if (dividend == (jint) 0x80000000L && divisor == -1)
1054     return 0;
1055
1056   return dividend % divisor;
1057 }
1058
1059 jlong
1060 _Jv_divJ (jlong dividend, jlong divisor)
1061 {
1062   if (__builtin_expect (divisor == 0, false))
1063     _Jv_ThrowSignal (arithexception);
1064
1065   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1066     return dividend;
1067
1068   return dividend / divisor;
1069 }
1070
1071 jlong
1072 _Jv_remJ (jlong dividend, jlong divisor)
1073 {
1074   if (__builtin_expect (divisor == 0, false))
1075     _Jv_ThrowSignal (arithexception);
1076
1077   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1078     return 0;
1079
1080   return dividend % divisor;
1081 }