libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000  Red Hat, Inc.
   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 #include <stdlib.h>
  14 #include <stdarg.h>
  15 #include <stdio.h>
  16 #include <string.h>
  17 #include <signal.h>
  18
  19 #ifdef HAVE_UNISTD_H
  20 #include <unistd.h>
  21 #endif
  22
  23 #include <gcj/cni.h>
  24 #include <jvm.h>
  25 #include <java-signal.h>
  26 #include <java-threads.h>
  27
  28 #ifndef DISABLE_GETENV_PROPERTIES
  29 #include <ctype.h>
  30 #include <java-props.h>
  31 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  32 #else
  33 #define PROCESS_GCJ_PROPERTIES
  34 #endif // DISABLE_GETENV_PROPERTIES
  35
  36 #include <java/lang/Class.h>
  37 #include <java/lang/Runtime.h>
  38 #include <java/lang/String.h>
  39 #include <java/lang/Thread.h>
  40 #include <java/lang/ThreadGroup.h>
  41 #include <java/lang/FirstThread.h>
  42 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  43 #include <java/lang/ArithmeticException.h>
  44 #include <java/lang/ClassFormatError.h>
  45 #include <java/lang/ClassCastException.h>
  46 #include <java/lang/NegativeArraySizeException.h>
  47 #include <java/lang/NullPointerException.h>
  48 #include <java/lang/OutOfMemoryError.h>
  49 #include <java/lang/ArrayStoreException.h>
  50 #include <java/lang/System.h>
  51 #include <java/lang/reflect/Modifier.h>
  52 #include <java/io/PrintStream.h>
  53
  54 #ifdef USE_LTDL
  55 #include <ltdl.h>
  56 #endif
  57
  58 #define ObjectClass _CL_Q34java4lang6Object
  59 extern java::lang::Class ObjectClass;
  60
  61 // We allocate a single OutOfMemoryError exception which we keep
  62 // around for use if we run out of memory.
  63 static java::lang::OutOfMemoryError *no_memory;
  64
  65 // Largest representable size_t.
  66 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  67
  68 // Properties set at compile time.
  69 const char **_Jv_Compiler_Properties;
  70
  71 #ifndef DISABLE_GETENV_PROPERTIES
  72 // Property key/value pairs.
  73 property_pair *_Jv_Environment_Properties;
  74 #endif
  75
  76 // The name of this executable.
  77 static char * _Jv_execName;
  78
  79 \f
  80
  81 #ifdef HANDLE_SEGV
  82 static java::lang::NullPointerException *nullp;
  83 SIGNAL_HANDLER (catch_segv)
  84 {
  85   MAKE_THROW_FRAME;
  86   nullp->fillInStackTrace ();
  87   _Jv_Throw (nullp);
  88 }
  89 #endif
  90
  91 static java::lang::ArithmeticException *arithexception;
  92
  93 #ifdef HANDLE_FPE
  94 SIGNAL_HANDLER (catch_fpe)
  95 {
  96 #ifdef HANDLE_DIVIDE_OVERFLOW
  97   HANDLE_DIVIDE_OVERFLOW;
  98 #else
  99   MAKE_THROW_FRAME;
 100 #endif
 101   arithexception->fillInStackTrace ();
 102   _Jv_Throw (arithexception);
 103 }
 104 #endif
 105
 106 \f
 107
 108 jboolean
 109 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 110 {
 111   register int len;
 112   register _Jv_ushort *aptr, *bptr;
 113   if (a == b)
 114     return true;
 115   if (a->hash != b->hash)
 116     return false;
 117   len = a->length;
 118   if (b->length != len)
 119     return false;
 120   aptr = (_Jv_ushort *)a->data;
 121   bptr = (_Jv_ushort *)b->data;
 122   len = (len + 1) >> 1;
 123   while (--len >= 0)
 124     if (*aptr++ != *bptr++)
 125       return false;
 126   return true;
 127 }
 128
 129 /* True iff A is equal to STR.
 130    HASH is STR->hashCode().
 131 */
 132
 133 jboolean
 134 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 135 {
 136   if (a->hash != (_Jv_ushort) hash)
 137     return false;
 138   jint len = str->length();
 139   jint i = 0;
 140   jchar *sptr = _Jv_GetStringChars (str);
 141   register unsigned char* ptr = (unsigned char*) a->data;
 142   register unsigned char* limit = ptr + a->length;
 143   for (;; i++, sptr++)
 144     {
 145       int ch = UTF8_GET (ptr, limit);
 146       if (i == len)
 147         return ch < 0;
 148       if (ch != *sptr)
 149         return false;
 150     }
 151   return true;
 152 }
 153
 154 /* Like _Jv_equal, but stop after N characters.  */
 155 jboolean
 156 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 157 {
 158   jint len = str->length();
 159   jint i = 0;
 160   jchar *sptr = _Jv_GetStringChars (str);
 161   register unsigned char* ptr = (unsigned char*) a->data;
 162   register unsigned char* limit = ptr + a->length;
 163   for (; n-- > 0; i++, sptr++)
 164     {
 165       int ch = UTF8_GET (ptr, limit);
 166       if (i == len)
 167         return ch < 0;
 168       if (ch != *sptr)
 169         return false;
 170     }
 171   return true;
 172 }
 173
 174 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 175 int
 176 _Jv_strLengthUtf8(char* str, int len)
 177 {
 178   register unsigned char* ptr;
 179   register unsigned char* limit;
 180   int str_length;
 181
 182   ptr = (unsigned char*) str;
 183   limit = ptr + len;
 184   str_length = 0;
 185   for (; ptr < limit; str_length++) {
 186     if (UTF8_GET (ptr, limit) < 0) {
 187       return (-1);
 188     }
 189   }
 190   return (str_length);
 191 }
 192
 193 /* Calculate a hash value for a string encoded in Utf8 format.
 194  * This returns the same hash value as specified or java.lang.String.hashCode.
 195  */
 196 static jint
 197 hashUtf8String (char* str, int len)
 198 {
 199   register unsigned char* ptr = (unsigned char*) str;
 200   register unsigned char* limit = ptr + len;
 201   jint hash = 0;
 202
 203   for (; ptr < limit;)
 204     {
 205       int ch = UTF8_GET (ptr, limit);
 206       /* Updated specification from
 207          http://www.javasoft.com/docs/books/jls/clarify.html. */
 208       hash = (31 * hash) + ch;
 209     }
 210   return hash;
 211 }
 212
 213 _Jv_Utf8Const *
 214 _Jv_makeUtf8Const (char* s, int len)
 215 {
 216   if (len < 0)
 217     len = strlen (s);
 218   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 219   if (! m)
 220     JvThrow (no_memory);
 221   memcpy (m->data, s, len);
 222   m->data[len] = 0;
 223   m->length = len;
 224   m->hash = hashUtf8String (s, len) & 0xFFFF;
 225   return (m);
 226 }
 227
 228 _Jv_Utf8Const *
 229 _Jv_makeUtf8Const (jstring string)
 230 {
 231   jint hash = string->hashCode ();
 232   jint len = _Jv_GetStringUTFLength (string);
 233
 234   Utf8Const* m = (Utf8Const*)
 235     _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
 236
 237   m->hash = hash;
 238   m->length = len;
 239
 240   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 241   m->data[len] = 0;
 242
 243   return m;
 244 }
 245
 246 \f
 247
 248 #ifdef DEBUG
 249 void
 250 _Jv_Abort (const char *function, const char *file, int line,
 251            const char *message)
 252 #else
 253 void
 254 _Jv_Abort (const char *, const char *, int, const char *message)
 255 #endif
 256 {
 257 #ifdef DEBUG
 258   fprintf (stderr,
 259            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 260            message, function, file, line);
 261 #else
 262   java::io::PrintStream *err = java::lang::System::err;
 263   err->print(JvNewStringLatin1 ("libgcj failure: "));
 264   err->println(JvNewStringLatin1 (message));
 265   err->flush();
 266 #endif
 267   abort ();
 268 }
 269
 270 static void
 271 fail_on_finalization (jobject)
 272 {
 273   JvFail ("object was finalized");
 274 }
 275
 276 void
 277 _Jv_GCWatch (jobject obj)
 278 {
 279   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 280 }
 281
 282 void
 283 _Jv_ThrowBadArrayIndex(jint bad_index)
 284 {
 285   JvThrow (new java::lang::ArrayIndexOutOfBoundsException
 286            (java::lang::String::valueOf(bad_index)));
 287 }
 288
 289 void*
 290 _Jv_CheckCast (jclass c, jobject obj)
 291 {
 292   if (obj != NULL && ! c->isAssignableFrom(obj->getClass()))
 293     JvThrow (new java::lang::ClassCastException);
 294   return obj;
 295 }
 296
 297 void
 298 _Jv_CheckArrayStore (jobject arr, jobject obj)
 299 {
 300   if (obj)
 301     {
 302       JvAssert (arr != NULL);
 303       jclass arr_class = arr->getClass();
 304       JvAssert (arr_class->isArray());
 305       jclass elt_class = arr_class->getComponentType();
 306       jclass obj_class = obj->getClass();
 307       if (! elt_class->isAssignableFrom(obj_class))
 308         JvThrow (new java::lang::ArrayStoreException);
 309     }
 310 }
 311
 312 \f
 313
 314 // Allocate some unscanned memory and throw an exception if no memory.
 315 void *
 316 _Jv_AllocBytesChecked (jsize size)
 317 {
 318   void *r = _Jv_AllocBytes (size);
 319   if (! r)
 320     _Jv_Throw (no_memory);
 321   return r;
 322 }
 323
 324 // Allocate a new object of class C.  SIZE is the size of the object
 325 // to allocate.  You might think this is redundant, but it isn't; some
 326 // classes, such as String, aren't of fixed size.
 327 jobject
 328 _Jv_AllocObject (jclass c, jint size)
 329 {
 330   _Jv_InitClass (c);
 331
 332   jobject obj = (jobject) _Jv_AllocObj (size);
 333   if (! obj)
 334     JvThrow (no_memory);
 335   *((_Jv_VTable **) obj) = c->vtable;
 336
 337   // If this class has inherited finalize from Object, then don't
 338   // bother registering a finalizer.  We know that finalize() is the
 339   // very first method after the dummy entry.  If this turns out to be
 340   // unreliable, a more robust implementation can be written.  Such an
 341   // implementation would look for Object.finalize in Object's method
 342   // table at startup, and then use that information to find the
 343   // appropriate index in the method vector.
 344   if (c->vtable->method[1] != ObjectClass.vtable->method[1])
 345     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 346
 347   return obj;
 348 }
 349
 350 // Allocate a new array of Java objects.  Each object is of type
 351 // `elementClass'.  `init' is used to initialize each slot in the
 352 // array.
 353 jobjectArray
 354 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 355 {
 356   if (count < 0)
 357     JvThrow (new java::lang::NegativeArraySizeException);
 358
 359   JvAssert (! elementClass->isPrimitive ());
 360
 361   jobjectArray obj = NULL;
 362   size_t size = (size_t) _Jv_GetArrayElementFromElementType (obj,
 363                                                              elementClass);
 364
 365   // Check for overflow.
 366   if ((size_t) count > (SIZE_T_MAX - size) / sizeof (jobject))
 367     JvThrow (no_memory);
 368
 369   size += count * sizeof (jobject);
 370
 371   // FIXME: second argument should be "current loader" //
 372   jclass clas = _Jv_FindArrayClass (elementClass, 0);
 373
 374   obj = (jobjectArray) _Jv_AllocArray (size);
 375   if (! obj)
 376     JvThrow (no_memory);
 377   obj->length = count;
 378   jobject* ptr = elements(obj);
 379   // We know the allocator returns zeroed memory.  So don't bother
 380   // zeroing it again.
 381   if (init)
 382     {
 383       while (--count >= 0)
 384         *ptr++ = init;
 385     }
 386   // Set the vtbl last to avoid problems if the GC happens during the
 387   // window in this function between the allocation and this
 388   // assignment.
 389   *((_Jv_VTable **) obj) = clas->vtable;
 390   return obj;
 391 }
 392
 393 // Allocate a new array of primitives.  ELTYPE is the type of the
 394 // element, COUNT is the size of the array.
 395 jobject
 396 _Jv_NewPrimArray (jclass eltype, jint count)
 397 {
 398   int elsize = eltype->size();
 399   if (count < 0)
 400     JvThrow (new java::lang::NegativeArraySizeException ());
 401
 402   JvAssert (eltype->isPrimitive ());
 403   jobject dummy = NULL;
 404   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 405
 406   // Check for overflow.
 407   if ((size_t) count > (SIZE_T_MAX - size) / elsize)
 408     JvThrow (no_memory);
 409
 410   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count);
 411   if (! arr)
 412     JvThrow (no_memory);
 413   arr->length = count;
 414   // Note that we assume we are given zeroed memory by the allocator.
 415
 416   jclass klass = _Jv_FindArrayClass (eltype, 0);
 417   // Set the vtbl last to avoid problems if the GC happens during the
 418   // window in this function between the allocation and this
 419   // assignment.
 420   *((_Jv_VTable **) arr) = klass->vtable;
 421   return arr;
 422 }
 423
 424 jcharArray
 425 JvNewCharArray (jint length)
 426 {
 427   return (jcharArray) _Jv_NewPrimArray (JvPrimClass (char), length);
 428 }
 429
 430 jbooleanArray
 431 JvNewBooleanArray (jint length)
 432 {
 433   return (jbooleanArray) _Jv_NewPrimArray (JvPrimClass (boolean), length);
 434 }
 435
 436 jbyteArray
 437 JvNewByteArray (jint length)
 438 {
 439   return (jbyteArray) _Jv_NewPrimArray (JvPrimClass (byte), length);
 440 }
 441
 442 jshortArray
 443 JvNewShortArray (jint length)
 444 {
 445   return (jshortArray) _Jv_NewPrimArray (JvPrimClass (short), length);
 446 }
 447
 448 jintArray
 449 JvNewIntArray (jint length)
 450 {
 451   return (jintArray) _Jv_NewPrimArray (JvPrimClass (int), length);
 452 }
 453
 454 jlongArray
 455 JvNewLongArray (jint length)
 456 {
 457   return (jlongArray) _Jv_NewPrimArray (JvPrimClass (long), length);
 458 }
 459
 460 jfloatArray
 461 JvNewFloatArray (jint length)
 462 {
 463   return (jfloatArray) _Jv_NewPrimArray (JvPrimClass (float), length);
 464 }
 465
 466 jdoubleArray
 467 JvNewDoubleArray (jint length)
 468 {
 469   return (jdoubleArray) _Jv_NewPrimArray (JvPrimClass (double), length);
 470 }
 471
 472 jobject
 473 _Jv_NewArray (jint type, jint size)
 474 {
 475   switch (type)
 476     {
 477       case  4:  return JvNewBooleanArray (size);
 478       case  5:  return JvNewCharArray (size);
 479       case  6:  return JvNewFloatArray (size);
 480       case  7:  return JvNewDoubleArray (size);
 481       case  8:  return JvNewByteArray (size);
 482       case  9:  return JvNewShortArray (size);
 483       case 10:  return JvNewIntArray (size);
 484       case 11:  return JvNewLongArray (size);
 485     }
 486   JvFail ("newarray - bad type code");
 487   return NULL;                  // Placate compiler.
 488 }
 489
 490 jobject
 491 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 492 {
 493   JvAssert (type->isArray());
 494   jclass element_type = type->getComponentType();
 495   jobject result;
 496   if (element_type->isPrimitive())
 497     result = _Jv_NewPrimArray (element_type, sizes[0]);
 498   else
 499     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 500
 501   if (dimensions > 1)
 502     {
 503       JvAssert (! element_type->isPrimitive());
 504       JvAssert (element_type->isArray());
 505       jobject *contents = elements ((jobjectArray) result);
 506       for (int i = 0; i < sizes[0]; ++i)
 507         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 508                                          sizes + 1);
 509     }
 510
 511   return result;
 512 }
 513
 514 jobject
 515 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 516 {
 517   va_list args;
 518   jint sizes[dimensions];
 519   va_start (args, dimensions);
 520   for (int i = 0; i < dimensions; ++i)
 521     {
 522       jint size = va_arg (args, jint);
 523       sizes[i] = size;
 524     }
 525   va_end (args);
 526
 527   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 528 }
 529
 530 \f
 531
 532 class _Jv_PrimClass : public java::lang::Class
 533 {
 534 public:
 535   // FIXME: calling convention is weird.  If we use the natural types
 536   // then the compiler will complain because they aren't Java types.
 537   _Jv_PrimClass (jobject cname, jbyte sig, jint len)
 538     {
 539       using namespace java::lang::reflect;
 540
 541       // We must initialize every field of the class.  We do this in
 542       // the same order they are declared in Class.h.
 543       next = NULL;
 544       name = _Jv_makeUtf8Const ((char *) cname, -1);
 545       accflags = Modifier::PUBLIC | Modifier::FINAL;
 546       superclass = NULL;
 547       constants.size = 0;
 548       constants.tags = NULL;
 549       constants.data = NULL;
 550       methods = NULL;
 551       method_count = sig;
 552       vtable_method_count = 0;
 553       fields = NULL;
 554       size_in_bytes = len;
 555       field_count = 0;
 556       static_field_count = 0;
 557       vtable = JV_PRIMITIVE_VTABLE;
 558       interfaces = NULL;
 559       loader = NULL;
 560       interface_count = 0;
 561       state = JV_STATE_NOTHING;
 562       thread = NULL;
 563     }
 564 };
 565
 566 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
 567   _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN)
 568
 569 DECLARE_PRIM_TYPE(byte, 'B', 1);
 570 DECLARE_PRIM_TYPE(short, 'S', 2);
 571 DECLARE_PRIM_TYPE(int, 'I', 4);
 572 DECLARE_PRIM_TYPE(long, 'J', 8);
 573 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 574 DECLARE_PRIM_TYPE(char, 'C', 2);
 575 DECLARE_PRIM_TYPE(float, 'F', 4);
 576 DECLARE_PRIM_TYPE(double, 'D', 8);
 577 DECLARE_PRIM_TYPE(void, 'V', 0);
 578
 579 jclass
 580 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 581 {
 582   switch (*sig)
 583     {
 584     case 'B':
 585       return JvPrimClass (byte);
 586     case 'S':
 587       return JvPrimClass (short);
 588     case 'I':
 589       return JvPrimClass (int);
 590     case 'J':
 591       return JvPrimClass (long);
 592     case 'Z':
 593       return JvPrimClass (boolean);
 594     case 'C':
 595       return JvPrimClass (char);
 596     case 'F':
 597       return JvPrimClass (float);
 598     case 'D':
 599       return JvPrimClass (double);
 600     case 'V':
 601       return JvPrimClass (void);
 602     case 'L':
 603       {
 604         int i;
 605         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 606           ;
 607         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 608         return _Jv_FindClass (name, loader);
 609
 610       }
 611     case '[':
 612       return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
 613                                  loader);
 614     }
 615   JvFail ("couldn't understand class signature");
 616   return NULL;                  // Placate compiler.
 617 }
 618
 619 \f
 620
 621 JArray<jstring> *
 622 JvConvertArgv (int argc, const char **argv)
 623 {
 624   if (argc < 0)
 625     argc = 0;
 626   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 627   jobject* ptr = elements(ar);
 628   for (int i = 0;  i < argc;  i++)
 629     {
 630       const char *arg = argv[i];
 631       // FIXME - should probably use JvNewStringUTF.
 632       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 633     }
 634   return (JArray<jstring>*) ar;
 635 }
 636
 637 // FIXME: These variables are static so that they will be
 638 // automatically scanned by the Boehm collector.  This is needed
 639 // because with qthreads the collector won't scan the initial stack --
 640 // it will only scan the qthreads stacks.
 641
 642 // Command line arguments.
 643 static jobject arg_vec;
 644
 645 // The primary threadgroup.
 646 static java::lang::ThreadGroup *main_group;
 647
 648 // The primary thread.
 649 static java::lang::Thread *main_thread;
 650
 651 char *
 652 _Jv_ThisExecutable (void)
 653 {
 654   return _Jv_execName;
 655 }
 656
 657 void
 658 _Jv_ThisExecutable (const char *name)
 659 {
 660   if (name)
 661     {
 662       _Jv_execName = new char[strlen (name) + 1];
 663       strcpy (_Jv_execName, name);
 664     }
 665 }
 666
 667 static void
 668 main_init ()
 669 {
 670   INIT_SEGV;
 671 #ifdef HANDLE_FPE
 672   INIT_FPE;
 673 #else
 674   arithexception = new java::lang::ArithmeticException
 675     (JvNewStringLatin1 ("/ by zero"));
 676 #endif
 677
 678   no_memory = new java::lang::OutOfMemoryError;
 679
 680 #ifdef USE_LTDL
 681   LTDL_SET_PRELOADED_SYMBOLS ();
 682 #endif
 683
 684   // FIXME: we only want this on POSIX systems.
 685   struct sigaction act;
 686   act.sa_handler = SIG_IGN;
 687   sigemptyset (&act.sa_mask);
 688   act.sa_flags = 0;
 689   sigaction (SIGPIPE, &act, NULL);
 690 }
 691
 692 #ifndef DISABLE_GETENV_PROPERTIES
 693
 694 static char *
 695 next_property_key (char *s, size_t *length)
 696 {
 697   size_t l = 0;
 698
 699   JvAssert (s);
 700
 701   // Skip over whitespace
 702   while (isspace (*s))
 703     s++;
 704
 705   // If we've reached the end, return NULL.  Also return NULL if for
 706   // some reason we've come across a malformed property string.
 707   if (*s == 0
 708       || *s == ':'
 709       || *s == '=')
 710     return NULL;
 711
 712   // Determine the length of the property key.
 713   while (s[l] != 0
 714          && ! isspace (s[l])
 715          && s[l] != ':'
 716          && s[l] != '=')
 717     {
 718       if (s[l] == '\\'
 719           && s[l+1] != 0)
 720         l++;
 721       l++;
 722     }
 723
 724   *length = l;
 725
 726   return s;
 727 }
 728
 729 static char *
 730 next_property_value (char *s, size_t *length)
 731 {
 732   size_t l = 0;
 733
 734   JvAssert (s);
 735
 736   while (isspace (*s))
 737     s++;
 738
 739   if (*s == ':'
 740       || *s == '=')
 741     s++;
 742
 743   while (isspace (*s))
 744     s++;
 745
 746   // If we've reached the end, return NULL.
 747   if (*s == 0)
 748     return NULL;
 749
 750   // Determine the length of the property value.
 751   while (s[l] != 0
 752          && ! isspace (s[l])
 753          && s[l] != ':'
 754          && s[l] != '=')
 755     {
 756       if (s[l] == '\\'
 757           && s[l+1] != 0)
 758         l += 2;
 759       else
 760         l++;
 761     }
 762
 763   *length = l;
 764
 765   return s;
 766 }
 767
 768 static void
 769 process_gcj_properties ()
 770 {
 771   char *props = getenv("GCJ_PROPERTIES");
 772   char *p = props;
 773   size_t length;
 774   size_t property_count = 0;
 775
 776   if (NULL == props)
 777     return;
 778
 779   // Whip through props quickly in order to count the number of
 780   // property values.
 781   while (p && (p = next_property_key (p, &length)))
 782     {
 783       // Skip to the end of the key
 784       p += length;
 785
 786       p = next_property_value (p, &length);
 787       if (p)
 788         p += length;
 789
 790       property_count++;
 791     }
 792
 793   // Allocate an array of property value/key pairs.
 794   _Jv_Environment_Properties =
 795     (property_pair *) malloc (sizeof(property_pair)
 796                               * (property_count + 1));
 797
 798   // Go through the properties again, initializing _Jv_Properties
 799   // along the way.
 800   p = props;
 801   property_count = 0;
 802   while (p && (p = next_property_key (p, &length)))
 803     {
 804       _Jv_Environment_Properties[property_count].key = p;
 805       _Jv_Environment_Properties[property_count].key_length = length;
 806
 807       // Skip to the end of the key
 808       p += length;
 809
 810       p = next_property_value (p, &length);
 811
 812       _Jv_Environment_Properties[property_count].value = p;
 813       _Jv_Environment_Properties[property_count].value_length = length;
 814
 815       if (p)
 816         p += length;
 817
 818       property_count++;
 819     }
 820   memset ((void *) &_Jv_Environment_Properties[property_count],
 821           0, sizeof (property_pair));
 822   {
 823     size_t i = 0;
 824
 825     // Null terminate the strings.
 826     while (_Jv_Environment_Properties[i].key)
 827       {
 828         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 829         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 830       }
 831   }
 832 }
 833 #endif // DISABLE_GETENV_PROPERTIES
 834
 835 void
 836 JvRunMain (jclass klass, int argc, const char **argv)
 837 {
 838   PROCESS_GCJ_PROPERTIES;
 839
 840   main_init ();
 841 #ifdef HAVE_PROC_SELF_EXE
 842   char exec_name[20];
 843   sprintf (exec_name, "/proc/%d/exe", getpid ());
 844   _Jv_ThisExecutable (exec_name);
 845 #else
 846   _Jv_ThisExecutable (argv[0]);
 847 #endif
 848
 849   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 850   main_group = new java::lang::ThreadGroup (23);
 851   main_thread = new java::lang::FirstThread (main_group, klass, arg_vec);
 852
 853   main_thread->start();
 854   _Jv_ThreadWait ();
 855
 856   java::lang::Runtime::getRuntime ()->exit (0);
 857 }
 858
 859 void
 860 _Jv_RunMain (const char *class_name, int argc, const char **argv)
 861 {
 862   PROCESS_GCJ_PROPERTIES;
 863
 864   main_init ();
 865
 866 #ifdef HAVE_PROC_SELF_EXE
 867   char exec_name[20];
 868   sprintf (exec_name, "/proc/%d/exe", getpid ());
 869   _Jv_ThisExecutable (exec_name);
 870 #endif
 871
 872   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 873   main_group = new java::lang::ThreadGroup (23);
 874   main_thread = new java::lang::FirstThread (main_group,
 875                                              JvNewStringLatin1 (class_name),
 876                                              arg_vec);
 877   main_thread->start();
 878   _Jv_ThreadWait ();
 879
 880   java::lang::Runtime::getRuntime ()->exit (0);
 881 }
 882
 883 \f
 884
 885 // Parse a string and return a heap size.
 886 static size_t
 887 parse_heap_size (const char *spec)
 888 {
 889   char *end;
 890   unsigned long val = strtoul (spec, &end, 10);
 891   if (*end == 'k' || *end == 'K')
 892     val *= 1024;
 893   else if (*end == 'm' || *end == 'M')
 894     val *= 1048576;
 895   return (size_t) val;
 896 }
 897
 898 // Set the initial heap size.  This might be ignored by the GC layer.
 899 // This must be called before _Jv_RunMain.
 900 void
 901 _Jv_SetInitialHeapSize (const char *arg)
 902 {
 903   size_t size = parse_heap_size (arg);
 904   _Jv_GCSetInitialHeapSize (size);
 905 }
 906
 907 // Set the maximum heap size.  This might be ignored by the GC layer.
 908 // This must be called before _Jv_RunMain.
 909 void
 910 _Jv_SetMaximumHeapSize (const char *arg)
 911 {
 912   size_t size = parse_heap_size (arg);
 913   _Jv_GCSetMaximumHeapSize (size);
 914 }
 915
 916 \f
 917
 918 void *
 919 _Jv_Malloc (jsize size)
 920 {
 921   if (size == 0)
 922     size = 1;
 923   void *ptr = malloc ((size_t) size);
 924   if (ptr == NULL)
 925     JvThrow (no_memory);
 926   return ptr;
 927 }
 928
 929 void
 930 _Jv_Free (void* ptr)
 931 {
 932   return free (ptr);
 933 }
 934
 935 \f
 936
 937 // In theory, these routines can be #ifdef'd away on machines which
 938 // support divide overflow signals.  However, we never know if some
 939 // code might have been compiled with "-fuse-divide-subroutine", so we
 940 // always include them in libgcj.
 941
 942 jint
 943 _Jv_divI (jint dividend, jint divisor)
 944 {
 945   if (divisor == 0)
 946     _Jv_Throw (arithexception);
 947
 948   if (dividend == (jint) 0x80000000L && divisor == -1)
 949     return dividend;
 950
 951   return dividend / divisor;
 952 }
 953
 954 jint
 955 _Jv_remI (jint dividend, jint divisor)
 956 {
 957   if (divisor == 0)
 958     _Jv_Throw (arithexception);
 959
 960   if (dividend == (jint) 0x80000000L && divisor == -1)
 961     return 0;
 962
 963   return dividend % divisor;
 964 }
 965
 966 jlong
 967 _Jv_divJ (jlong dividend, jlong divisor)
 968 {
 969   if (divisor == 0)
 970     _Jv_Throw (arithexception);
 971
 972   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
 973     return dividend;
 974
 975   return dividend / divisor;
 976 }
 977
 978 jlong
 979 _Jv_remJ (jlong dividend, jlong divisor)
 980 {
 981   if (divisor == 0)
 982     _Jv_Throw (arithexception);
 983
 984   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
 985     return 0;
 986
 987   return dividend % divisor;
 988 }