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 #define ObjectClass _CL_Q34java4lang6Object
  71 extern java::lang::Class ObjectClass;
  72
  73 // We allocate a single OutOfMemoryError exception which we keep
  74 // around for use if we run out of memory.
  75 static java::lang::OutOfMemoryError *no_memory;
  76
  77 // Largest representable size_t.
  78 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  79
  80 // Properties set at compile time.
  81 const char **_Jv_Compiler_Properties;
  82
  83 // The JAR file to add to the beginning of java.class.path.
  84 const char *_Jv_Jar_Class_Path;
  85
  86 #ifndef DISABLE_GETENV_PROPERTIES
  87 // Property key/value pairs.
  88 property_pair *_Jv_Environment_Properties;
  89 #endif
  90
  91 // The name of this executable.
  92 static char * _Jv_execName;
  93
  94 // Stash the argv pointer to benefit native libraries that need it.
  95 const char **_Jv_argv;
  96 int _Jv_argc;
  97
  98 #ifdef ENABLE_JVMPI
  99 // Pointer to JVMPI notification functions.
 100 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 101 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 102 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 103 #endif
 104 \f
 105
 106 extern "C" void _Jv_ThrowSignal (void *) __attribute ((noreturn));
 107
 108 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 109 // this is declared extern in order that its name not be mangled, it
 110 // is not intended to be used outside this file.
 111 void
 112 _Jv_ThrowSignal (void *e)
 113 {
 114   java::lang::Throwable *throwable = (java::lang::Throwable *)e;
 115   throwable->fillInStackTrace ();
 116   _Jv_Throw (throwable);
 117 }
 118
 119 #ifdef HANDLE_SEGV
 120 static java::lang::NullPointerException *nullp;
 121
 122 SIGNAL_HANDLER (catch_segv)
 123 {
 124   MAKE_THROW_FRAME (nullp);
 125   _Jv_ThrowSignal (nullp);
 126 }
 127 #endif
 128
 129 static java::lang::ArithmeticException *arithexception;
 130
 131 #ifdef HANDLE_FPE
 132 SIGNAL_HANDLER (catch_fpe)
 133 {
 134 #ifdef HANDLE_DIVIDE_OVERFLOW
 135   HANDLE_DIVIDE_OVERFLOW;
 136 #else
 137   MAKE_THROW_FRAME (arithexception);
 138 #endif
 139   _Jv_ThrowSignal (arithexception);
 140 }
 141 #endif
 142
 143 \f
 144
 145 jboolean
 146 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 147 {
 148   int len;
 149   _Jv_ushort *aptr, *bptr;
 150   if (a == b)
 151     return true;
 152   if (a->hash != b->hash)
 153     return false;
 154   len = a->length;
 155   if (b->length != len)
 156     return false;
 157   aptr = (_Jv_ushort *)a->data;
 158   bptr = (_Jv_ushort *)b->data;
 159   len = (len + 1) >> 1;
 160   while (--len >= 0)
 161     if (*aptr++ != *bptr++)
 162       return false;
 163   return true;
 164 }
 165
 166 /* True iff A is equal to STR.
 167    HASH is STR->hashCode().
 168 */
 169
 170 jboolean
 171 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 172 {
 173   if (a->hash != (_Jv_ushort) hash)
 174     return false;
 175   jint len = str->length();
 176   jint i = 0;
 177   jchar *sptr = _Jv_GetStringChars (str);
 178   unsigned char* ptr = (unsigned char*) a->data;
 179   unsigned char* limit = ptr + a->length;
 180   for (;; 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 /* Like _Jv_equal, but stop after N characters.  */
 192 jboolean
 193 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 194 {
 195   jint len = str->length();
 196   jint i = 0;
 197   jchar *sptr = _Jv_GetStringChars (str);
 198   unsigned char* ptr = (unsigned char*) a->data;
 199   unsigned char* limit = ptr + a->length;
 200   for (; n-- > 0; i++, sptr++)
 201     {
 202       int ch = UTF8_GET (ptr, limit);
 203       if (i == len)
 204         return ch < 0;
 205       if (ch != *sptr)
 206         return false;
 207     }
 208   return true;
 209 }
 210
 211 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 212 int
 213 _Jv_strLengthUtf8(char* str, int len)
 214 {
 215   unsigned char* ptr;
 216   unsigned char* limit;
 217   int str_length;
 218
 219   ptr = (unsigned char*) str;
 220   limit = ptr + len;
 221   str_length = 0;
 222   for (; ptr < limit; str_length++) {
 223     if (UTF8_GET (ptr, limit) < 0) {
 224       return (-1);
 225     }
 226   }
 227   return (str_length);
 228 }
 229
 230 /* Calculate a hash value for a string encoded in Utf8 format.
 231  * This returns the same hash value as specified or java.lang.String.hashCode.
 232  */
 233 static jint
 234 hashUtf8String (char* str, int len)
 235 {
 236   unsigned char* ptr = (unsigned char*) str;
 237   unsigned char* limit = ptr + len;
 238   jint hash = 0;
 239
 240   for (; ptr < limit;)
 241     {
 242       int ch = UTF8_GET (ptr, limit);
 243       /* Updated specification from
 244          http://www.javasoft.com/docs/books/jls/clarify.html. */
 245       hash = (31 * hash) + ch;
 246     }
 247   return hash;
 248 }
 249
 250 _Jv_Utf8Const *
 251 _Jv_makeUtf8Const (char* s, int len)
 252 {
 253   if (len < 0)
 254     len = strlen (s);
 255   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 256   if (! m)
 257     JvThrow (no_memory);
 258   memcpy (m->data, s, len);
 259   m->data[len] = 0;
 260   m->length = len;
 261   m->hash = hashUtf8String (s, len) & 0xFFFF;
 262   return (m);
 263 }
 264
 265 _Jv_Utf8Const *
 266 _Jv_makeUtf8Const (jstring string)
 267 {
 268   jint hash = string->hashCode ();
 269   jint len = _Jv_GetStringUTFLength (string);
 270
 271   Utf8Const* m = (Utf8Const*)
 272     _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
 273
 274   m->hash = hash;
 275   m->length = len;
 276
 277   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 278   m->data[len] = 0;
 279
 280   return m;
 281 }
 282
 283 \f
 284
 285 #ifdef DEBUG
 286 void
 287 _Jv_Abort (const char *function, const char *file, int line,
 288            const char *message)
 289 #else
 290 void
 291 _Jv_Abort (const char *, const char *, int, const char *message)
 292 #endif
 293 {
 294 #ifdef DEBUG
 295   fprintf (stderr,
 296            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 297            message, function, file, line);
 298 #else
 299   java::io::PrintStream *err = java::lang::System::err;
 300   err->print(JvNewStringLatin1 ("libgcj failure: "));
 301   err->println(JvNewStringLatin1 (message));
 302   err->flush();
 303 #endif
 304   abort ();
 305 }
 306
 307 static void
 308 fail_on_finalization (jobject)
 309 {
 310   JvFail ("object was finalized");
 311 }
 312
 313 void
 314 _Jv_GCWatch (jobject obj)
 315 {
 316   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 317 }
 318
 319 void
 320 _Jv_ThrowBadArrayIndex(jint bad_index)
 321 {
 322   JvThrow (new java::lang::ArrayIndexOutOfBoundsException
 323            (java::lang::String::valueOf(bad_index)));
 324 }
 325
 326 void
 327 _Jv_ThrowNullPointerException ()
 328 {
 329   throw new java::lang::NullPointerException ();
 330 }
 331
 332 // Allocate some unscanned memory and throw an exception if no memory.
 333 void *
 334 _Jv_AllocBytesChecked (jsize size)
 335 {
 336   void *r = _Jv_AllocBytes (size);
 337   if (! r)
 338     _Jv_Throw (no_memory);
 339   return r;
 340 }
 341
 342 // Allocate a new object of class KLASS.  SIZE is the size of the object
 343 // to allocate.  You might think this is redundant, but it isn't; some
 344 // classes, such as String, aren't of fixed size.
 345 jobject
 346 _Jv_AllocObject (jclass klass, jint size)
 347 {
 348   _Jv_InitClass (klass);
 349
 350   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 351   if (__builtin_expect (! obj, false))
 352     JvThrow (no_memory);
 353
 354   // If this class has inherited finalize from Object, then don't
 355   // bother registering a finalizer.  We know that finalize() is the
 356   // very first method after the dummy entry.  If this turns out to be
 357   // unreliable, a more robust implementation can be written.  Such an
 358   // implementation would look for Object.finalize in Object's method
 359   // table at startup, and then use that information to find the
 360   // appropriate index in the method vector.
 361   if (klass->vtable->get_finalizer() != ObjectClass.vtable->get_finalizer())
 362     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 363
 364 #ifdef ENABLE_JVMPI
 365   // Service JVMPI request.
 366
 367   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 368     {
 369       JVMPI_Event event;
 370
 371       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 372       event.env_id = NULL;
 373       event.u.obj_alloc.arena_id = 0;
 374       event.u.obj_alloc.class_id = (jobjectID) klass;
 375       event.u.obj_alloc.is_array = 0;
 376       event.u.obj_alloc.size = size;
 377       event.u.obj_alloc.obj_id = (jobjectID) obj;
 378
 379       _Jv_DisableGC ();
 380       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 381       _Jv_EnableGC ();
 382     }
 383 #endif
 384
 385   return obj;
 386 }
 387
 388 // Allocate a new array of Java objects.  Each object is of type
 389 // `elementClass'.  `init' is used to initialize each slot in the
 390 // array.
 391 jobjectArray
 392 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 393 {
 394   if (__builtin_expect (count < 0, false))
 395     JvThrow (new java::lang::NegativeArraySizeException);
 396
 397   JvAssert (! elementClass->isPrimitive ());
 398
 399   jobjectArray obj = NULL;
 400   size_t size = (size_t) _Jv_GetArrayElementFromElementType (obj,
 401                                                              elementClass);
 402
 403   // Check for overflow.
 404   if (__builtin_expect ((size_t) count >
 405                         (SIZE_T_MAX - size) / sizeof (jobject), false))
 406     JvThrow (no_memory);
 407
 408   size += count * sizeof (jobject);
 409
 410   // FIXME: second argument should be "current loader" //
 411   jclass klass = _Jv_FindArrayClass (elementClass, 0);
 412
 413   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 414   if (__builtin_expect (! obj, false))
 415     JvThrow (no_memory);
 416   obj->length = 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   arr->length = count;
 452   // Note that we assume we are given zeroed memory by the allocator.
 453
 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 thread.
 641 static java::lang::Thread *main_thread;
 642
 643 char *
 644 _Jv_ThisExecutable (void)
 645 {
 646   return _Jv_execName;
 647 }
 648
 649 void
 650 _Jv_ThisExecutable (const char *name)
 651 {
 652   if (name)
 653     {
 654       _Jv_execName = new char[strlen (name) + 1];
 655       strcpy (_Jv_execName, name);
 656     }
 657 }
 658
 659 #ifdef USE_WIN32_SIGNALLING
 660
 661 extern "C" int* win32_get_restart_frame (void *);
 662
 663 LONG CALLBACK
 664 win32_exception_handler (LPEXCEPTION_POINTERS e)
 665 {
 666   int* setjmp_buf;
 667   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 668     setjmp_buf = win32_get_restart_frame (nullp);
 669   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 670     setjmp_buf = win32_get_restart_frame (arithexception);
 671   else
 672     return EXCEPTION_CONTINUE_SEARCH;
 673
 674   e->ContextRecord->Ebp = setjmp_buf[0];
 675   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 676   e->ContextRecord->Eip = setjmp_buf[1];
 677   // FIXME: Is this the stack pointer? Do we need it?
 678   e->ContextRecord->Esp = setjmp_buf[2];
 679
 680   return EXCEPTION_CONTINUE_EXECUTION;
 681 }
 682
 683 #endif
 684
 685 static void
 686 main_init ()
 687 {
 688   INIT_SEGV;
 689 #ifdef HANDLE_FPE
 690   INIT_FPE;
 691 #else
 692   arithexception = new java::lang::ArithmeticException
 693     (JvNewStringLatin1 ("/ by zero"));
 694 #endif
 695
 696   no_memory = new java::lang::OutOfMemoryError;
 697
 698 #ifdef USE_LTDL
 699   LTDL_SET_PRELOADED_SYMBOLS ();
 700 #endif
 701
 702 #ifdef USE_WINSOCK
 703   // Initialise winsock for networking
 704   WSADATA data;
 705   if (WSAStartup (MAKEWORD (1, 1), &data))
 706       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 707 #endif /* USE_WINSOCK */
 708
 709 #ifdef USE_WIN32_SIGNALLING
 710   // Install exception handler
 711   SetUnhandledExceptionFilter (win32_exception_handler);
 712 #else
 713   // We only want this on POSIX systems.
 714   struct sigaction act;
 715   act.sa_handler = SIG_IGN;
 716   sigemptyset (&act.sa_mask);
 717   act.sa_flags = 0;
 718   sigaction (SIGPIPE, &act, NULL);
 719 #endif /* USE_WIN32_SIGNALLING */
 720
 721   _Jv_JNI_Init ();
 722 }
 723
 724 #ifndef DISABLE_GETENV_PROPERTIES
 725
 726 static char *
 727 next_property_key (char *s, size_t *length)
 728 {
 729   size_t l = 0;
 730
 731   JvAssert (s);
 732
 733   // Skip over whitespace
 734   while (isspace (*s))
 735     s++;
 736
 737   // If we've reached the end, return NULL.  Also return NULL if for
 738   // some reason we've come across a malformed property string.
 739   if (*s == 0
 740       || *s == ':'
 741       || *s == '=')
 742     return NULL;
 743
 744   // Determine the length of the property key.
 745   while (s[l] != 0
 746          && ! isspace (s[l])
 747          && s[l] != ':'
 748          && s[l] != '=')
 749     {
 750       if (s[l] == '\\'
 751           && s[l+1] != 0)
 752         l++;
 753       l++;
 754     }
 755
 756   *length = l;
 757
 758   return s;
 759 }
 760
 761 static char *
 762 next_property_value (char *s, size_t *length)
 763 {
 764   size_t l = 0;
 765
 766   JvAssert (s);
 767
 768   while (isspace (*s))
 769     s++;
 770
 771   if (*s == ':'
 772       || *s == '=')
 773     s++;
 774
 775   while (isspace (*s))
 776     s++;
 777
 778   // If we've reached the end, return NULL.
 779   if (*s == 0)
 780     return NULL;
 781
 782   // Determine the length of the property value.
 783   while (s[l] != 0
 784          && ! isspace (s[l])
 785          && s[l] != ':'
 786          && s[l] != '=')
 787     {
 788       if (s[l] == '\\'
 789           && s[l+1] != 0)
 790         l += 2;
 791       else
 792         l++;
 793     }
 794
 795   *length = l;
 796
 797   return s;
 798 }
 799
 800 static void
 801 process_gcj_properties ()
 802 {
 803   char *props = getenv("GCJ_PROPERTIES");
 804   char *p = props;
 805   size_t length;
 806   size_t property_count = 0;
 807
 808   if (NULL == props)
 809     return;
 810
 811   // Whip through props quickly in order to count the number of
 812   // property values.
 813   while (p && (p = next_property_key (p, &length)))
 814     {
 815       // Skip to the end of the key
 816       p += length;
 817
 818       p = next_property_value (p, &length);
 819       if (p)
 820         p += length;
 821
 822       property_count++;
 823     }
 824
 825   // Allocate an array of property value/key pairs.
 826   _Jv_Environment_Properties =
 827     (property_pair *) malloc (sizeof(property_pair)
 828                               * (property_count + 1));
 829
 830   // Go through the properties again, initializing _Jv_Properties
 831   // along the way.
 832   p = props;
 833   property_count = 0;
 834   while (p && (p = next_property_key (p, &length)))
 835     {
 836       _Jv_Environment_Properties[property_count].key = p;
 837       _Jv_Environment_Properties[property_count].key_length = length;
 838
 839       // Skip to the end of the key
 840       p += length;
 841
 842       p = next_property_value (p, &length);
 843
 844       _Jv_Environment_Properties[property_count].value = p;
 845       _Jv_Environment_Properties[property_count].value_length = length;
 846
 847       if (p)
 848         p += length;
 849
 850       property_count++;
 851     }
 852   memset ((void *) &_Jv_Environment_Properties[property_count],
 853           0, sizeof (property_pair));
 854   {
 855     size_t i = 0;
 856
 857     // Null terminate the strings.
 858     while (_Jv_Environment_Properties[i].key)
 859       {
 860         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 861         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 862       }
 863   }
 864 }
 865 #endif // DISABLE_GETENV_PROPERTIES
 866
 867 void
 868 JvRunMain (jclass klass, int argc, const char **argv)
 869 {
 870   PROCESS_GCJ_PROPERTIES;
 871
 872   _Jv_argv = argv;
 873   _Jv_argc = argc;
 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_thread = new gnu::gcj::runtime::FirstThread (klass, arg_vec);
 886
 887   main_thread->start();
 888   _Jv_ThreadWait ();
 889
 890   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 891
 892   java::lang::Runtime::getRuntime ()->exit (status);
 893 }
 894
 895 void
 896 _Jv_RunMain (const char *name, int argc, const char **argv, bool is_jar)
 897 {
 898   jstring class_name;
 899   PROCESS_GCJ_PROPERTIES;
 900
 901   main_init ();
 902
 903 #ifdef HAVE_PROC_SELF_EXE
 904   char exec_name[20];
 905   sprintf (exec_name, "/proc/%d/exe", getpid ());
 906   _Jv_ThisExecutable (exec_name);
 907 #endif
 908
 909   if (is_jar)
 910     {
 911       // name specifies a jar file.  We must now extract the
 912       // Main-Class attribute from the jar's manifest file.  This is
 913       // done by gnu.gcj.runtime.FirstThread.main.
 914       _Jv_Jar_Class_Path = strdup (name);
 915       arg_vec = JvConvertArgv (1, &_Jv_Jar_Class_Path);
 916
 917       main_thread =
 918         new gnu::gcj::runtime::FirstThread (&_CL_Q43gnu3gcj7runtime11FirstThread,
 919                                             arg_vec);
 920       main_thread->start();
 921       _Jv_ThreadWait ();
 922
 923       // FirstThread.main extracts the main class name and stores it
 924       // here.
 925       class_name = gnu::gcj::runtime::FirstThread::jarMainClassName;
 926
 927       // We need a new ClassLoader because the classpath must be the
 928       // jar file only.  The easiest way to do this is to lose our
 929       // reference to the previous classloader.
 930       java::lang::ClassLoader::system = NULL;
 931     }
 932   else
 933     class_name = JvNewStringLatin1 (name);
 934
 935   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 936
 937   if (class_name)
 938     {
 939       main_thread = new gnu::gcj::runtime::FirstThread (class_name, arg_vec);
 940       main_thread->start();
 941       _Jv_ThreadWait ();
 942     }
 943
 944   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 945
 946   java::lang::Runtime::getRuntime ()->exit (status);
 947 }
 948
 949 \f
 950
 951 // Parse a string and return a heap size.
 952 static size_t
 953 parse_heap_size (const char *spec)
 954 {
 955   char *end;
 956   unsigned long val = strtoul (spec, &end, 10);
 957   if (*end == 'k' || *end == 'K')
 958     val *= 1024;
 959   else if (*end == 'm' || *end == 'M')
 960     val *= 1048576;
 961   return (size_t) val;
 962 }
 963
 964 // Set the initial heap size.  This might be ignored by the GC layer.
 965 // This must be called before _Jv_RunMain.
 966 void
 967 _Jv_SetInitialHeapSize (const char *arg)
 968 {
 969   size_t size = parse_heap_size (arg);
 970   _Jv_GCSetInitialHeapSize (size);
 971 }
 972
 973 // Set the maximum heap size.  This might be ignored by the GC layer.
 974 // This must be called before _Jv_RunMain.
 975 void
 976 _Jv_SetMaximumHeapSize (const char *arg)
 977 {
 978   size_t size = parse_heap_size (arg);
 979   _Jv_GCSetMaximumHeapSize (size);
 980 }
 981
 982 \f
 983
 984 void *
 985 _Jv_Malloc (jsize size)
 986 {
 987   if (__builtin_expect (size == 0, false))
 988     size = 1;
 989   void *ptr = malloc ((size_t) size);
 990   if (__builtin_expect (ptr == NULL, false))
 991     JvThrow (no_memory);
 992   return ptr;
 993 }
 994
 995 void *
 996 _Jv_Realloc (void *ptr, jsize size)
 997 {
 998   if (__builtin_expect (size == 0, false))
 999     size = 1;
1000   ptr = realloc (ptr, (size_t) size);
1001   if (__builtin_expect (ptr == NULL, false))
1002     JvThrow (no_memory);
1003   return ptr;
1004 }
1005
1006 void *
1007 _Jv_MallocUnchecked (jsize size)
1008 {
1009   if (__builtin_expect (size == 0, false))
1010     size = 1;
1011   return malloc ((size_t) size);
1012 }
1013
1014 void
1015 _Jv_Free (void* ptr)
1016 {
1017   return free (ptr);
1018 }
1019
1020 \f
1021
1022 // In theory, these routines can be #ifdef'd away on machines which
1023 // support divide overflow signals.  However, we never know if some
1024 // code might have been compiled with "-fuse-divide-subroutine", so we
1025 // always include them in libgcj.
1026
1027 jint
1028 _Jv_divI (jint dividend, jint divisor)
1029 {
1030   if (__builtin_expect (divisor == 0, false))
1031     _Jv_ThrowSignal (arithexception);
1032
1033   if (dividend == (jint) 0x80000000L && divisor == -1)
1034     return dividend;
1035
1036   return dividend / divisor;
1037 }
1038
1039 jint
1040 _Jv_remI (jint dividend, jint divisor)
1041 {
1042   if (__builtin_expect (divisor == 0, false))
1043     _Jv_ThrowSignal (arithexception);
1044
1045   if (dividend == (jint) 0x80000000L && divisor == -1)
1046     return 0;
1047
1048   return dividend % divisor;
1049 }
1050
1051 jlong
1052 _Jv_divJ (jlong dividend, jlong divisor)
1053 {
1054   if (__builtin_expect (divisor == 0, false))
1055     _Jv_ThrowSignal (arithexception);
1056
1057   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1058     return dividend;
1059
1060   return dividend / divisor;
1061 }
1062
1063 jlong
1064 _Jv_remJ (jlong dividend, jlong divisor)
1065 {
1066   if (__builtin_expect (divisor == 0, false))
1067     _Jv_ThrowSignal (arithexception);
1068
1069   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1070     return 0;
1071
1072   return dividend % divisor;
1073 }