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 #ifdef ENABLE_JVMPI
  95 // Pointer to JVMPI notification functions.
  96 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
  97 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
  98 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
  99 #endif
 100 \f
 101
 102 extern "C" void _Jv_ThrowSignal (void *) __attribute ((noreturn));
 103
 104 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 105 // this is declared extern in order that its name not be mangled, it
 106 // is not intended to be used outside this file.
 107 void
 108 _Jv_ThrowSignal (void *e)
 109 {
 110   java::lang::Throwable *throwable = (java::lang::Throwable *)e;
 111   throwable->fillInStackTrace ();
 112   _Jv_Throw (throwable);
 113 }
 114
 115 #ifdef HANDLE_SEGV
 116 static java::lang::NullPointerException *nullp;
 117
 118 SIGNAL_HANDLER (catch_segv)
 119 {
 120   MAKE_THROW_FRAME (nullp);
 121   _Jv_ThrowSignal (nullp);
 122 }
 123 #endif
 124
 125 static java::lang::ArithmeticException *arithexception;
 126
 127 #ifdef HANDLE_FPE
 128 SIGNAL_HANDLER (catch_fpe)
 129 {
 130 #ifdef HANDLE_DIVIDE_OVERFLOW
 131   HANDLE_DIVIDE_OVERFLOW;
 132 #else
 133   MAKE_THROW_FRAME (arithexception);
 134 #endif
 135   _Jv_ThrowSignal (arithexception);
 136 }
 137 #endif
 138
 139 \f
 140
 141 jboolean
 142 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 143 {
 144   int len;
 145   _Jv_ushort *aptr, *bptr;
 146   if (a == b)
 147     return true;
 148   if (a->hash != b->hash)
 149     return false;
 150   len = a->length;
 151   if (b->length != len)
 152     return false;
 153   aptr = (_Jv_ushort *)a->data;
 154   bptr = (_Jv_ushort *)b->data;
 155   len = (len + 1) >> 1;
 156   while (--len >= 0)
 157     if (*aptr++ != *bptr++)
 158       return false;
 159   return true;
 160 }
 161
 162 /* True iff A is equal to STR.
 163    HASH is STR->hashCode().
 164 */
 165
 166 jboolean
 167 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 168 {
 169   if (a->hash != (_Jv_ushort) hash)
 170     return false;
 171   jint len = str->length();
 172   jint i = 0;
 173   jchar *sptr = _Jv_GetStringChars (str);
 174   unsigned char* ptr = (unsigned char*) a->data;
 175   unsigned char* limit = ptr + a->length;
 176   for (;; i++, sptr++)
 177     {
 178       int ch = UTF8_GET (ptr, limit);
 179       if (i == len)
 180         return ch < 0;
 181       if (ch != *sptr)
 182         return false;
 183     }
 184   return true;
 185 }
 186
 187 /* Like _Jv_equal, but stop after N characters.  */
 188 jboolean
 189 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 190 {
 191   jint len = str->length();
 192   jint i = 0;
 193   jchar *sptr = _Jv_GetStringChars (str);
 194   unsigned char* ptr = (unsigned char*) a->data;
 195   unsigned char* limit = ptr + a->length;
 196   for (; n-- > 0; i++, sptr++)
 197     {
 198       int ch = UTF8_GET (ptr, limit);
 199       if (i == len)
 200         return ch < 0;
 201       if (ch != *sptr)
 202         return false;
 203     }
 204   return true;
 205 }
 206
 207 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 208 int
 209 _Jv_strLengthUtf8(char* str, int len)
 210 {
 211   unsigned char* ptr;
 212   unsigned char* limit;
 213   int str_length;
 214
 215   ptr = (unsigned char*) str;
 216   limit = ptr + len;
 217   str_length = 0;
 218   for (; ptr < limit; str_length++) {
 219     if (UTF8_GET (ptr, limit) < 0) {
 220       return (-1);
 221     }
 222   }
 223   return (str_length);
 224 }
 225
 226 /* Calculate a hash value for a string encoded in Utf8 format.
 227  * This returns the same hash value as specified or java.lang.String.hashCode.
 228  */
 229 static jint
 230 hashUtf8String (char* str, int len)
 231 {
 232   unsigned char* ptr = (unsigned char*) str;
 233   unsigned char* limit = ptr + len;
 234   jint hash = 0;
 235
 236   for (; ptr < limit;)
 237     {
 238       int ch = UTF8_GET (ptr, limit);
 239       /* Updated specification from
 240          http://www.javasoft.com/docs/books/jls/clarify.html. */
 241       hash = (31 * hash) + ch;
 242     }
 243   return hash;
 244 }
 245
 246 _Jv_Utf8Const *
 247 _Jv_makeUtf8Const (char* s, int len)
 248 {
 249   if (len < 0)
 250     len = strlen (s);
 251   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 252   if (! m)
 253     JvThrow (no_memory);
 254   memcpy (m->data, s, len);
 255   m->data[len] = 0;
 256   m->length = len;
 257   m->hash = hashUtf8String (s, len) & 0xFFFF;
 258   return (m);
 259 }
 260
 261 _Jv_Utf8Const *
 262 _Jv_makeUtf8Const (jstring string)
 263 {
 264   jint hash = string->hashCode ();
 265   jint len = _Jv_GetStringUTFLength (string);
 266
 267   Utf8Const* m = (Utf8Const*)
 268     _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
 269
 270   m->hash = hash;
 271   m->length = len;
 272
 273   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 274   m->data[len] = 0;
 275
 276   return m;
 277 }
 278
 279 \f
 280
 281 #ifdef DEBUG
 282 void
 283 _Jv_Abort (const char *function, const char *file, int line,
 284            const char *message)
 285 #else
 286 void
 287 _Jv_Abort (const char *, const char *, int, const char *message)
 288 #endif
 289 {
 290 #ifdef DEBUG
 291   fprintf (stderr,
 292            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 293            message, function, file, line);
 294 #else
 295   java::io::PrintStream *err = java::lang::System::err;
 296   err->print(JvNewStringLatin1 ("libgcj failure: "));
 297   err->println(JvNewStringLatin1 (message));
 298   err->flush();
 299 #endif
 300   abort ();
 301 }
 302
 303 static void
 304 fail_on_finalization (jobject)
 305 {
 306   JvFail ("object was finalized");
 307 }
 308
 309 void
 310 _Jv_GCWatch (jobject obj)
 311 {
 312   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 313 }
 314
 315 void
 316 _Jv_ThrowBadArrayIndex(jint bad_index)
 317 {
 318   JvThrow (new java::lang::ArrayIndexOutOfBoundsException
 319            (java::lang::String::valueOf(bad_index)));
 320 }
 321
 322 void
 323 _Jv_ThrowNullPointerException ()
 324 {
 325   throw new java::lang::NullPointerException ();
 326 }
 327
 328 // Allocate some unscanned memory and throw an exception if no memory.
 329 void *
 330 _Jv_AllocBytesChecked (jsize size)
 331 {
 332   void *r = _Jv_AllocBytes (size);
 333   if (! r)
 334     _Jv_Throw (no_memory);
 335   return r;
 336 }
 337
 338 // Allocate a new object of class KLASS.  SIZE is the size of the object
 339 // to allocate.  You might think this is redundant, but it isn't; some
 340 // classes, such as String, aren't of fixed size.
 341 jobject
 342 _Jv_AllocObject (jclass klass, jint size)
 343 {
 344   _Jv_InitClass (klass);
 345
 346   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 347   if (__builtin_expect (! obj, false))
 348     JvThrow (no_memory);
 349
 350   // If this class has inherited finalize from Object, then don't
 351   // bother registering a finalizer.  We know that finalize() is the
 352   // very first method after the dummy entry.  If this turns out to be
 353   // unreliable, a more robust implementation can be written.  Such an
 354   // implementation would look for Object.finalize in Object's method
 355   // table at startup, and then use that information to find the
 356   // appropriate index in the method vector.
 357   if (klass->vtable->get_finalizer() != ObjectClass.vtable->get_finalizer())
 358     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 359
 360 #ifdef ENABLE_JVMPI
 361   // Service JVMPI request.
 362
 363   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 364     {
 365       JVMPI_Event event;
 366
 367       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 368       event.env_id = NULL;
 369       event.u.obj_alloc.arena_id = 0;
 370       event.u.obj_alloc.class_id = (jobjectID) klass;
 371       event.u.obj_alloc.is_array = 0;
 372       event.u.obj_alloc.size = size;
 373       event.u.obj_alloc.obj_id = (jobjectID) obj;
 374
 375       _Jv_DisableGC ();
 376       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 377       _Jv_EnableGC ();
 378     }
 379 #endif
 380
 381   return obj;
 382 }
 383
 384 // Allocate a new array of Java objects.  Each object is of type
 385 // `elementClass'.  `init' is used to initialize each slot in the
 386 // array.
 387 jobjectArray
 388 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 389 {
 390   if (__builtin_expect (count < 0, false))
 391     JvThrow (new java::lang::NegativeArraySizeException);
 392
 393   JvAssert (! elementClass->isPrimitive ());
 394
 395   jobjectArray obj = NULL;
 396   size_t size = (size_t) _Jv_GetArrayElementFromElementType (obj,
 397                                                              elementClass);
 398
 399   // Check for overflow.
 400   if (__builtin_expect ((size_t) count >
 401                         (SIZE_T_MAX - size) / sizeof (jobject), false))
 402     JvThrow (no_memory);
 403
 404   size += count * sizeof (jobject);
 405
 406   // FIXME: second argument should be "current loader" //
 407   jclass klass = _Jv_FindArrayClass (elementClass, 0);
 408
 409   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 410   if (__builtin_expect (! obj, false))
 411     JvThrow (no_memory);
 412   obj->length = count;
 413   jobject* ptr = elements(obj);
 414   // We know the allocator returns zeroed memory.  So don't bother
 415   // zeroing it again.
 416   if (init)
 417     {
 418       while (--count >= 0)
 419         *ptr++ = init;
 420     }
 421   return obj;
 422 }
 423
 424 // Allocate a new array of primitives.  ELTYPE is the type of the
 425 // element, COUNT is the size of the array.
 426 jobject
 427 _Jv_NewPrimArray (jclass eltype, jint count)
 428 {
 429   int elsize = eltype->size();
 430   if (__builtin_expect (count < 0, false))
 431     JvThrow (new java::lang::NegativeArraySizeException ());
 432
 433   JvAssert (eltype->isPrimitive ());
 434   jobject dummy = NULL;
 435   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 436
 437   // Check for overflow.
 438   if (__builtin_expect ((size_t) count >
 439                         (SIZE_T_MAX - size) / elsize, false))
 440     JvThrow (no_memory);
 441
 442   jclass klass = _Jv_FindArrayClass (eltype, 0);
 443
 444   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 445   if (__builtin_expect (! arr, false))
 446     JvThrow (no_memory);
 447   arr->length = count;
 448   // Note that we assume we are given zeroed memory by the allocator.
 449
 450   return arr;
 451 }
 452
 453 jobject
 454 _Jv_NewArray (jint type, jint size)
 455 {
 456   switch (type)
 457     {
 458       case  4:  return JvNewBooleanArray (size);
 459       case  5:  return JvNewCharArray (size);
 460       case  6:  return JvNewFloatArray (size);
 461       case  7:  return JvNewDoubleArray (size);
 462       case  8:  return JvNewByteArray (size);
 463       case  9:  return JvNewShortArray (size);
 464       case 10:  return JvNewIntArray (size);
 465       case 11:  return JvNewLongArray (size);
 466     }
 467   JvFail ("newarray - bad type code");
 468   return NULL;                  // Placate compiler.
 469 }
 470
 471 jobject
 472 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 473 {
 474   JvAssert (type->isArray());
 475   jclass element_type = type->getComponentType();
 476   jobject result;
 477   if (element_type->isPrimitive())
 478     result = _Jv_NewPrimArray (element_type, sizes[0]);
 479   else
 480     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 481
 482   if (dimensions > 1)
 483     {
 484       JvAssert (! element_type->isPrimitive());
 485       JvAssert (element_type->isArray());
 486       jobject *contents = elements ((jobjectArray) result);
 487       for (int i = 0; i < sizes[0]; ++i)
 488         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 489                                          sizes + 1);
 490     }
 491
 492   return result;
 493 }
 494
 495 jobject
 496 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 497 {
 498   va_list args;
 499   jint sizes[dimensions];
 500   va_start (args, dimensions);
 501   for (int i = 0; i < dimensions; ++i)
 502     {
 503       jint size = va_arg (args, jint);
 504       sizes[i] = size;
 505     }
 506   va_end (args);
 507
 508   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 509 }
 510
 511 \f
 512
 513 class _Jv_PrimClass : public java::lang::Class
 514 {
 515 public:
 516   // FIXME: calling convention is weird.  If we use the natural types
 517   // then the compiler will complain because they aren't Java types.
 518   _Jv_PrimClass (jobject cname, jbyte sig, jint len, jobject array_vtable)
 519     {
 520       using namespace java::lang::reflect;
 521
 522       // We must initialize every field of the class.  We do this in
 523       // the same order they are declared in Class.h.
 524       next = NULL;
 525       name = _Jv_makeUtf8Const ((char *) cname, -1);
 526       accflags = Modifier::PUBLIC | Modifier::FINAL;
 527       superclass = NULL;
 528       constants.size = 0;
 529       constants.tags = NULL;
 530       constants.data = NULL;
 531       methods = NULL;
 532       method_count = sig;
 533       vtable_method_count = 0;
 534       fields = NULL;
 535       size_in_bytes = len;
 536       field_count = 0;
 537       static_field_count = 0;
 538       vtable = JV_PRIMITIVE_VTABLE;
 539       interfaces = NULL;
 540       loader = NULL;
 541       interface_count = 0;
 542       state = JV_STATE_DONE;
 543       thread = NULL;
 544
 545       // Note that we have to set `methods' to NULL.
 546       if (sig != 'V')
 547         _Jv_FindArrayClass (this, NULL, (_Jv_VTable *) array_vtable);
 548     }
 549 };
 550
 551 // We use this to define both primitive classes and the vtables for
 552 // arrays of primitive classes.  The latter are given names so that we
 553 // can refer to them from the compiler, allowing us to construct
 554 // arrays of primitives statically.
 555 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
 556   _Jv_ArrayVTable _Jv_##NAME##VTable; \
 557   _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN, \
 558                                   (jobject) &_Jv_##NAME##VTable)
 559
 560 DECLARE_PRIM_TYPE(byte, 'B', 1);
 561 DECLARE_PRIM_TYPE(short, 'S', 2);
 562 DECLARE_PRIM_TYPE(int, 'I', 4);
 563 DECLARE_PRIM_TYPE(long, 'J', 8);
 564 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 565 DECLARE_PRIM_TYPE(char, 'C', 2);
 566 DECLARE_PRIM_TYPE(float, 'F', 4);
 567 DECLARE_PRIM_TYPE(double, 'D', 8);
 568 DECLARE_PRIM_TYPE(void, 'V', 0);
 569
 570 jclass
 571 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 572 {
 573   switch (*sig)
 574     {
 575     case 'B':
 576       return JvPrimClass (byte);
 577     case 'S':
 578       return JvPrimClass (short);
 579     case 'I':
 580       return JvPrimClass (int);
 581     case 'J':
 582       return JvPrimClass (long);
 583     case 'Z':
 584       return JvPrimClass (boolean);
 585     case 'C':
 586       return JvPrimClass (char);
 587     case 'F':
 588       return JvPrimClass (float);
 589     case 'D':
 590       return JvPrimClass (double);
 591     case 'V':
 592       return JvPrimClass (void);
 593     case 'L':
 594       {
 595         int i;
 596         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 597           ;
 598         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 599         return _Jv_FindClass (name, loader);
 600
 601       }
 602     case '[':
 603       return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
 604                                  loader);
 605     }
 606   JvFail ("couldn't understand class signature");
 607   return NULL;                  // Placate compiler.
 608 }
 609
 610 \f
 611
 612 JArray<jstring> *
 613 JvConvertArgv (int argc, const char **argv)
 614 {
 615   if (argc < 0)
 616     argc = 0;
 617   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 618   jobject* ptr = elements(ar);
 619   for (int i = 0;  i < argc;  i++)
 620     {
 621       const char *arg = argv[i];
 622       // FIXME - should probably use JvNewStringUTF.
 623       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 624     }
 625   return (JArray<jstring>*) ar;
 626 }
 627
 628 // FIXME: These variables are static so that they will be
 629 // automatically scanned by the Boehm collector.  This is needed
 630 // because with qthreads the collector won't scan the initial stack --
 631 // it will only scan the qthreads stacks.
 632
 633 // Command line arguments.
 634 static jobject arg_vec;
 635
 636 // The primary thread.
 637 static java::lang::Thread *main_thread;
 638
 639 char *
 640 _Jv_ThisExecutable (void)
 641 {
 642   return _Jv_execName;
 643 }
 644
 645 void
 646 _Jv_ThisExecutable (const char *name)
 647 {
 648   if (name)
 649     {
 650       _Jv_execName = new char[strlen (name) + 1];
 651       strcpy (_Jv_execName, name);
 652     }
 653 }
 654
 655 #ifdef USE_WIN32_SIGNALLING
 656
 657 extern "C" int* win32_get_restart_frame (void *);
 658
 659 LONG CALLBACK
 660 win32_exception_handler (LPEXCEPTION_POINTERS e)
 661 {
 662   int* setjmp_buf;
 663   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 664     setjmp_buf = win32_get_restart_frame (nullp);
 665   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 666     setjmp_buf = win32_get_restart_frame (arithexception);
 667   else
 668     return EXCEPTION_CONTINUE_SEARCH;
 669
 670   e->ContextRecord->Ebp = setjmp_buf[0];
 671   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 672   e->ContextRecord->Eip = setjmp_buf[1];
 673   // FIXME: Is this the stack pointer? Do we need it?
 674   e->ContextRecord->Esp = setjmp_buf[2];
 675
 676   return EXCEPTION_CONTINUE_EXECUTION;
 677 }
 678
 679 #endif
 680
 681 static void
 682 main_init ()
 683 {
 684   INIT_SEGV;
 685 #ifdef HANDLE_FPE
 686   INIT_FPE;
 687 #else
 688   arithexception = new java::lang::ArithmeticException
 689     (JvNewStringLatin1 ("/ by zero"));
 690 #endif
 691
 692   no_memory = new java::lang::OutOfMemoryError;
 693
 694 #ifdef USE_LTDL
 695   LTDL_SET_PRELOADED_SYMBOLS ();
 696 #endif
 697
 698 #ifdef USE_WINSOCK
 699   // Initialise winsock for networking
 700   WSADATA data;
 701   if (WSAStartup (MAKEWORD (1, 1), &data))
 702       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 703 #endif /* USE_WINSOCK */
 704
 705 #ifdef USE_WIN32_SIGNALLING
 706   // Install exception handler
 707   SetUnhandledExceptionFilter (win32_exception_handler);
 708 #else
 709   // We only want this on POSIX systems.
 710   struct sigaction act;
 711   act.sa_handler = SIG_IGN;
 712   sigemptyset (&act.sa_mask);
 713   act.sa_flags = 0;
 714   sigaction (SIGPIPE, &act, NULL);
 715 #endif /* USE_WIN32_SIGNALLING */
 716
 717   _Jv_JNI_Init ();
 718 }
 719
 720 #ifndef DISABLE_GETENV_PROPERTIES
 721
 722 static char *
 723 next_property_key (char *s, size_t *length)
 724 {
 725   size_t l = 0;
 726
 727   JvAssert (s);
 728
 729   // Skip over whitespace
 730   while (isspace (*s))
 731     s++;
 732
 733   // If we've reached the end, return NULL.  Also return NULL if for
 734   // some reason we've come across a malformed property string.
 735   if (*s == 0
 736       || *s == ':'
 737       || *s == '=')
 738     return NULL;
 739
 740   // Determine the length of the property key.
 741   while (s[l] != 0
 742          && ! isspace (s[l])
 743          && s[l] != ':'
 744          && s[l] != '=')
 745     {
 746       if (s[l] == '\\'
 747           && s[l+1] != 0)
 748         l++;
 749       l++;
 750     }
 751
 752   *length = l;
 753
 754   return s;
 755 }
 756
 757 static char *
 758 next_property_value (char *s, size_t *length)
 759 {
 760   size_t l = 0;
 761
 762   JvAssert (s);
 763
 764   while (isspace (*s))
 765     s++;
 766
 767   if (*s == ':'
 768       || *s == '=')
 769     s++;
 770
 771   while (isspace (*s))
 772     s++;
 773
 774   // If we've reached the end, return NULL.
 775   if (*s == 0)
 776     return NULL;
 777
 778   // Determine the length of the property value.
 779   while (s[l] != 0
 780          && ! isspace (s[l])
 781          && s[l] != ':'
 782          && s[l] != '=')
 783     {
 784       if (s[l] == '\\'
 785           && s[l+1] != 0)
 786         l += 2;
 787       else
 788         l++;
 789     }
 790
 791   *length = l;
 792
 793   return s;
 794 }
 795
 796 static void
 797 process_gcj_properties ()
 798 {
 799   char *props = getenv("GCJ_PROPERTIES");
 800   char *p = props;
 801   size_t length;
 802   size_t property_count = 0;
 803
 804   if (NULL == props)
 805     return;
 806
 807   // Whip through props quickly in order to count the number of
 808   // property values.
 809   while (p && (p = next_property_key (p, &length)))
 810     {
 811       // Skip to the end of the key
 812       p += length;
 813
 814       p = next_property_value (p, &length);
 815       if (p)
 816         p += length;
 817
 818       property_count++;
 819     }
 820
 821   // Allocate an array of property value/key pairs.
 822   _Jv_Environment_Properties =
 823     (property_pair *) malloc (sizeof(property_pair)
 824                               * (property_count + 1));
 825
 826   // Go through the properties again, initializing _Jv_Properties
 827   // along the way.
 828   p = props;
 829   property_count = 0;
 830   while (p && (p = next_property_key (p, &length)))
 831     {
 832       _Jv_Environment_Properties[property_count].key = p;
 833       _Jv_Environment_Properties[property_count].key_length = length;
 834
 835       // Skip to the end of the key
 836       p += length;
 837
 838       p = next_property_value (p, &length);
 839
 840       _Jv_Environment_Properties[property_count].value = p;
 841       _Jv_Environment_Properties[property_count].value_length = length;
 842
 843       if (p)
 844         p += length;
 845
 846       property_count++;
 847     }
 848   memset ((void *) &_Jv_Environment_Properties[property_count],
 849           0, sizeof (property_pair));
 850   {
 851     size_t i = 0;
 852
 853     // Null terminate the strings.
 854     while (_Jv_Environment_Properties[i].key)
 855       {
 856         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 857         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 858       }
 859   }
 860 }
 861 #endif // DISABLE_GETENV_PROPERTIES
 862
 863 void
 864 JvRunMain (jclass klass, int argc, const char **argv)
 865 {
 866   PROCESS_GCJ_PROPERTIES;
 867
 868   main_init ();
 869 #ifdef HAVE_PROC_SELF_EXE
 870   char exec_name[20];
 871   sprintf (exec_name, "/proc/%d/exe", getpid ());
 872   _Jv_ThisExecutable (exec_name);
 873 #else
 874   _Jv_ThisExecutable (argv[0]);
 875 #endif
 876
 877   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 878   main_thread = new gnu::gcj::runtime::FirstThread (klass, arg_vec);
 879
 880   main_thread->start();
 881   _Jv_ThreadWait ();
 882
 883   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 884
 885   java::lang::Runtime::getRuntime ()->exit (status);
 886 }
 887
 888 void
 889 _Jv_RunMain (const char *name, int argc, const char **argv, bool is_jar)
 890 {
 891   jstring class_name;
 892   PROCESS_GCJ_PROPERTIES;
 893
 894   main_init ();
 895
 896 #ifdef HAVE_PROC_SELF_EXE
 897   char exec_name[20];
 898   sprintf (exec_name, "/proc/%d/exe", getpid ());
 899   _Jv_ThisExecutable (exec_name);
 900 #endif
 901
 902   if (is_jar)
 903     {
 904       // name specifies a jar file.  We must now extract the
 905       // Main-Class attribute from the jar's manifest file.  This is
 906       // done by gnu.gcj.runtime.FirstThread.main.
 907       _Jv_Jar_Class_Path = strdup (name);
 908       arg_vec = JvConvertArgv (1, &_Jv_Jar_Class_Path);
 909
 910       main_thread =
 911         new gnu::gcj::runtime::FirstThread (&_CL_Q43gnu3gcj7runtime11FirstThread,
 912                                             arg_vec);
 913       main_thread->start();
 914       _Jv_ThreadWait ();
 915
 916       // FirstThread.main extracts the main class name and stores it
 917       // here.
 918       class_name = gnu::gcj::runtime::FirstThread::jarMainClassName;
 919
 920       // We need a new ClassLoader because the classpath must be the
 921       // jar file only.  The easiest way to do this is to lose our
 922       // reference to the previous classloader.
 923       java::lang::ClassLoader::system = NULL;
 924     }
 925   else
 926     class_name = JvNewStringLatin1 (name);
 927
 928   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 929
 930   if (class_name)
 931     {
 932       main_thread = new gnu::gcj::runtime::FirstThread (class_name, arg_vec);
 933       main_thread->start();
 934       _Jv_ThreadWait ();
 935     }
 936
 937   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 938
 939   java::lang::Runtime::getRuntime ()->exit (status);
 940 }
 941
 942 \f
 943
 944 // Parse a string and return a heap size.
 945 static size_t
 946 parse_heap_size (const char *spec)
 947 {
 948   char *end;
 949   unsigned long val = strtoul (spec, &end, 10);
 950   if (*end == 'k' || *end == 'K')
 951     val *= 1024;
 952   else if (*end == 'm' || *end == 'M')
 953     val *= 1048576;
 954   return (size_t) val;
 955 }
 956
 957 // Set the initial heap size.  This might be ignored by the GC layer.
 958 // This must be called before _Jv_RunMain.
 959 void
 960 _Jv_SetInitialHeapSize (const char *arg)
 961 {
 962   size_t size = parse_heap_size (arg);
 963   _Jv_GCSetInitialHeapSize (size);
 964 }
 965
 966 // Set the maximum heap size.  This might be ignored by the GC layer.
 967 // This must be called before _Jv_RunMain.
 968 void
 969 _Jv_SetMaximumHeapSize (const char *arg)
 970 {
 971   size_t size = parse_heap_size (arg);
 972   _Jv_GCSetMaximumHeapSize (size);
 973 }
 974
 975 \f
 976
 977 void *
 978 _Jv_Malloc (jsize size)
 979 {
 980   if (__builtin_expect (size == 0, false))
 981     size = 1;
 982   void *ptr = malloc ((size_t) size);
 983   if (__builtin_expect (ptr == NULL, false))
 984     JvThrow (no_memory);
 985   return ptr;
 986 }
 987
 988 void *
 989 _Jv_Realloc (void *ptr, jsize size)
 990 {
 991   if (__builtin_expect (size == 0, false))
 992     size = 1;
 993   ptr = realloc (ptr, (size_t) size);
 994   if (__builtin_expect (ptr == NULL, false))
 995     JvThrow (no_memory);
 996   return ptr;
 997 }
 998
 999 void *
1000 _Jv_MallocUnchecked (jsize size)
1001 {
1002   if (__builtin_expect (size == 0, false))
1003     size = 1;
1004   return malloc ((size_t) size);
1005 }
1006
1007 void
1008 _Jv_Free (void* ptr)
1009 {
1010   return free (ptr);
1011 }
1012
1013 \f
1014
1015 // In theory, these routines can be #ifdef'd away on machines which
1016 // support divide overflow signals.  However, we never know if some
1017 // code might have been compiled with "-fuse-divide-subroutine", so we
1018 // always include them in libgcj.
1019
1020 jint
1021 _Jv_divI (jint dividend, jint divisor)
1022 {
1023   if (__builtin_expect (divisor == 0, false))
1024     _Jv_ThrowSignal (arithexception);
1025
1026   if (dividend == (jint) 0x80000000L && divisor == -1)
1027     return dividend;
1028
1029   return dividend / divisor;
1030 }
1031
1032 jint
1033 _Jv_remI (jint dividend, jint divisor)
1034 {
1035   if (__builtin_expect (divisor == 0, false))
1036     _Jv_ThrowSignal (arithexception);
1037
1038   if (dividend == (jint) 0x80000000L && divisor == -1)
1039     return 0;
1040
1041   return dividend % divisor;
1042 }
1043
1044 jlong
1045 _Jv_divJ (jlong dividend, jlong divisor)
1046 {
1047   if (__builtin_expect (divisor == 0, false))
1048     _Jv_ThrowSignal (arithexception);
1049
1050   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1051     return dividend;
1052
1053   return dividend / divisor;
1054 }
1055
1056 jlong
1057 _Jv_remJ (jlong dividend, jlong divisor)
1058 {
1059   if (__builtin_expect (divisor == 0, false))
1060     _Jv_ThrowSignal (arithexception);
1061
1062   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1063     return 0;
1064
1065   return dividend % divisor;
1066 }