libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001  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 (jthrowable) __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 (jthrowable throwable)
 110 {
 111   throwable->fillInStackTrace ();
 112   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     throw 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   throw 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     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     throw 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()
 358       != java::lang::Object::class$.vtable->get_finalizer())
 359     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 360
 361 #ifdef ENABLE_JVMPI
 362   // Service JVMPI request.
 363
 364   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 365     {
 366       JVMPI_Event event;
 367
 368       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 369       event.env_id = NULL;
 370       event.u.obj_alloc.arena_id = 0;
 371       event.u.obj_alloc.class_id = (jobjectID) klass;
 372       event.u.obj_alloc.is_array = 0;
 373       event.u.obj_alloc.size = size;
 374       event.u.obj_alloc.obj_id = (jobjectID) obj;
 375
 376       _Jv_DisableGC ();
 377       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 378       _Jv_EnableGC ();
 379     }
 380 #endif
 381
 382   return obj;
 383 }
 384
 385 // Allocate a new array of Java objects.  Each object is of type
 386 // `elementClass'.  `init' is used to initialize each slot in the
 387 // array.
 388 jobjectArray
 389 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 390 {
 391   if (__builtin_expect (count < 0, false))
 392     throw new java::lang::NegativeArraySizeException;
 393
 394   JvAssert (! elementClass->isPrimitive ());
 395
 396   // Ensure that elements pointer is properly aligned.
 397   jobjectArray obj = NULL;
 398   size_t size = (size_t) elements (obj);
 399   size += count * sizeof (jobject);
 400
 401   // FIXME: second argument should be "current loader"
 402   jclass klass = _Jv_GetArrayClass (elementClass, 0);
 403
 404   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 405   if (__builtin_expect (! obj, false))
 406     throw no_memory;
 407   // Cast away const.
 408   jsize *lp = const_cast<jsize *> (&obj->length);
 409   *lp = count;
 410   // We know the allocator returns zeroed memory.  So don't bother
 411   // zeroing it again.
 412   if (init)
 413     {
 414       jobject *ptr = elements(obj);
 415       while (--count >= 0)
 416         *ptr++ = init;
 417     }
 418   return obj;
 419 }
 420
 421 // Allocate a new array of primitives.  ELTYPE is the type of the
 422 // element, COUNT is the size of the array.
 423 jobject
 424 _Jv_NewPrimArray (jclass eltype, jint count)
 425 {
 426   int elsize = eltype->size();
 427   if (__builtin_expect (count < 0, false))
 428     throw new java::lang::NegativeArraySizeException;
 429
 430   JvAssert (eltype->isPrimitive ());
 431   jobject dummy = NULL;
 432   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 433
 434   // Check for overflow.
 435   if (__builtin_expect ((size_t) count >
 436                         (SIZE_T_MAX - size) / elsize, false))
 437     throw no_memory;
 438
 439   jclass klass = _Jv_GetArrayClass (eltype, 0);
 440
 441   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 442   if (__builtin_expect (! arr, false))
 443     throw no_memory;
 444   // Cast away const.
 445   jsize *lp = const_cast<jsize *> (&arr->length);
 446   *lp = count;
 447   // Note that we assume we are given zeroed memory by the allocator.
 448
 449   return arr;
 450 }
 451
 452 jobject
 453 _Jv_NewArray (jint type, jint size)
 454 {
 455   switch (type)
 456     {
 457       case  4:  return JvNewBooleanArray (size);
 458       case  5:  return JvNewCharArray (size);
 459       case  6:  return JvNewFloatArray (size);
 460       case  7:  return JvNewDoubleArray (size);
 461       case  8:  return JvNewByteArray (size);
 462       case  9:  return JvNewShortArray (size);
 463       case 10:  return JvNewIntArray (size);
 464       case 11:  return JvNewLongArray (size);
 465     }
 466   JvFail ("newarray - bad type code");
 467   return NULL;                  // Placate compiler.
 468 }
 469
 470 jobject
 471 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 472 {
 473   JvAssert (type->isArray());
 474   jclass element_type = type->getComponentType();
 475   jobject result;
 476   if (element_type->isPrimitive())
 477     result = _Jv_NewPrimArray (element_type, sizes[0]);
 478   else
 479     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 480
 481   if (dimensions > 1)
 482     {
 483       JvAssert (! element_type->isPrimitive());
 484       JvAssert (element_type->isArray());
 485       jobject *contents = elements ((jobjectArray) result);
 486       for (int i = 0; i < sizes[0]; ++i)
 487         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 488                                          sizes + 1);
 489     }
 490
 491   return result;
 492 }
 493
 494 jobject
 495 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 496 {
 497   va_list args;
 498   jint sizes[dimensions];
 499   va_start (args, dimensions);
 500   for (int i = 0; i < dimensions; ++i)
 501     {
 502       jint size = va_arg (args, jint);
 503       sizes[i] = size;
 504     }
 505   va_end (args);
 506
 507   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 508 }
 509
 510 \f
 511
 512 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN)                               \
 513   _Jv_ArrayVTable _Jv_##NAME##VTable;                                   \
 514   java::lang::Class _Jv_##NAME##Class ((jobject) #NAME,                 \
 515                                        (jbyte) SIG, (jint) LEN,         \
 516                                        (jobject) &_Jv_##NAME##VTable);
 517
 518 DECLARE_PRIM_TYPE(byte, 'B', 1);
 519 DECLARE_PRIM_TYPE(short, 'S', 2);
 520 DECLARE_PRIM_TYPE(int, 'I', 4);
 521 DECLARE_PRIM_TYPE(long, 'J', 8);
 522 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 523 DECLARE_PRIM_TYPE(char, 'C', 2);
 524 DECLARE_PRIM_TYPE(float, 'F', 4);
 525 DECLARE_PRIM_TYPE(double, 'D', 8);
 526 DECLARE_PRIM_TYPE(void, 'V', 0);
 527
 528 jclass
 529 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 530 {
 531   switch (*sig)
 532     {
 533     case 'B':
 534       return JvPrimClass (byte);
 535     case 'S':
 536       return JvPrimClass (short);
 537     case 'I':
 538       return JvPrimClass (int);
 539     case 'J':
 540       return JvPrimClass (long);
 541     case 'Z':
 542       return JvPrimClass (boolean);
 543     case 'C':
 544       return JvPrimClass (char);
 545     case 'F':
 546       return JvPrimClass (float);
 547     case 'D':
 548       return JvPrimClass (double);
 549     case 'V':
 550       return JvPrimClass (void);
 551     case 'L':
 552       {
 553         int i;
 554         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 555           ;
 556         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 557         return _Jv_FindClass (name, loader);
 558
 559       }
 560     case '[':
 561       {
 562         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 563         if (! klass)
 564           return NULL;
 565         return _Jv_GetArrayClass (klass, loader);
 566       }
 567     }
 568
 569   return NULL;                  // Placate compiler.
 570 }
 571
 572 \f
 573
 574 JArray<jstring> *
 575 JvConvertArgv (int argc, const char **argv)
 576 {
 577   if (argc < 0)
 578     argc = 0;
 579   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 580   jobject* ptr = elements(ar);
 581   for (int i = 0;  i < argc;  i++)
 582     {
 583       const char *arg = argv[i];
 584       // FIXME - should probably use JvNewStringUTF.
 585       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 586     }
 587   return (JArray<jstring>*) ar;
 588 }
 589
 590 // FIXME: These variables are static so that they will be
 591 // automatically scanned by the Boehm collector.  This is needed
 592 // because with qthreads the collector won't scan the initial stack --
 593 // it will only scan the qthreads stacks.
 594
 595 // Command line arguments.
 596 static jobject arg_vec;
 597
 598 // The primary thread.
 599 static java::lang::Thread *main_thread;
 600
 601 char *
 602 _Jv_ThisExecutable (void)
 603 {
 604   return _Jv_execName;
 605 }
 606
 607 void
 608 _Jv_ThisExecutable (const char *name)
 609 {
 610   if (name)
 611     {
 612       _Jv_execName = (char *) _Jv_Malloc (strlen (name) + 1);
 613       strcpy (_Jv_execName, name);
 614     }
 615 }
 616
 617 #ifdef USE_WIN32_SIGNALLING
 618
 619 extern "C" int* win32_get_restart_frame (void *);
 620
 621 LONG CALLBACK
 622 win32_exception_handler (LPEXCEPTION_POINTERS e)
 623 {
 624   int* setjmp_buf;
 625   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 626     setjmp_buf = win32_get_restart_frame (nullp);
 627   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 628     setjmp_buf = win32_get_restart_frame (arithexception);
 629   else
 630     return EXCEPTION_CONTINUE_SEARCH;
 631
 632   e->ContextRecord->Ebp = setjmp_buf[0];
 633   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 634   e->ContextRecord->Eip = setjmp_buf[1];
 635   // FIXME: Is this the stack pointer? Do we need it?
 636   e->ContextRecord->Esp = setjmp_buf[2];
 637
 638   return EXCEPTION_CONTINUE_EXECUTION;
 639 }
 640
 641 #endif
 642
 643 static void
 644 main_init ()
 645 {
 646   // Turn stack trace generation off while creating exception objects.
 647   _Jv_InitClass (&java::lang::Throwable::class$);
 648   java::lang::Throwable::trace_enabled = 0;
 649
 650   INIT_SEGV;
 651 #ifdef HANDLE_FPE
 652   INIT_FPE;
 653 #else
 654   arithexception = new java::lang::ArithmeticException
 655     (JvNewStringLatin1 ("/ by zero"));
 656 #endif
 657
 658   no_memory = new java::lang::OutOfMemoryError;
 659
 660   java::lang::Throwable::trace_enabled = 1;
 661
 662 #ifdef USE_LTDL
 663   LTDL_SET_PRELOADED_SYMBOLS ();
 664 #endif
 665
 666 #ifdef USE_WINSOCK
 667   // Initialise winsock for networking
 668   WSADATA data;
 669   if (WSAStartup (MAKEWORD (1, 1), &data))
 670       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 671 #endif /* USE_WINSOCK */
 672
 673 #ifdef USE_WIN32_SIGNALLING
 674   // Install exception handler
 675   SetUnhandledExceptionFilter (win32_exception_handler);
 676 #else
 677   // We only want this on POSIX systems.
 678   struct sigaction act;
 679   act.sa_handler = SIG_IGN;
 680   sigemptyset (&act.sa_mask);
 681   act.sa_flags = 0;
 682   sigaction (SIGPIPE, &act, NULL);
 683 #endif /* USE_WIN32_SIGNALLING */
 684
 685   _Jv_JNI_Init ();
 686 }
 687
 688 #ifndef DISABLE_GETENV_PROPERTIES
 689
 690 static char *
 691 next_property_key (char *s, size_t *length)
 692 {
 693   size_t l = 0;
 694
 695   JvAssert (s);
 696
 697   // Skip over whitespace
 698   while (isspace (*s))
 699     s++;
 700
 701   // If we've reached the end, return NULL.  Also return NULL if for
 702   // some reason we've come across a malformed property string.
 703   if (*s == 0
 704       || *s == ':'
 705       || *s == '=')
 706     return NULL;
 707
 708   // Determine the length of the property key.
 709   while (s[l] != 0
 710          && ! isspace (s[l])
 711          && s[l] != ':'
 712          && s[l] != '=')
 713     {
 714       if (s[l] == '\\'
 715           && s[l+1] != 0)
 716         l++;
 717       l++;
 718     }
 719
 720   *length = l;
 721
 722   return s;
 723 }
 724
 725 static char *
 726 next_property_value (char *s, size_t *length)
 727 {
 728   size_t l = 0;
 729
 730   JvAssert (s);
 731
 732   while (isspace (*s))
 733     s++;
 734
 735   if (*s == ':'
 736       || *s == '=')
 737     s++;
 738
 739   while (isspace (*s))
 740     s++;
 741
 742   // If we've reached the end, return NULL.
 743   if (*s == 0)
 744     return NULL;
 745
 746   // Determine the length of the property value.
 747   while (s[l] != 0
 748          && ! isspace (s[l])
 749          && s[l] != ':'
 750          && s[l] != '=')
 751     {
 752       if (s[l] == '\\'
 753           && s[l+1] != 0)
 754         l += 2;
 755       else
 756         l++;
 757     }
 758
 759   *length = l;
 760
 761   return s;
 762 }
 763
 764 static void
 765 process_gcj_properties ()
 766 {
 767   char *props = getenv("GCJ_PROPERTIES");
 768   char *p = props;
 769   size_t length;
 770   size_t property_count = 0;
 771
 772   if (NULL == props)
 773     return;
 774
 775   // Whip through props quickly in order to count the number of
 776   // property values.
 777   while (p && (p = next_property_key (p, &length)))
 778     {
 779       // Skip to the end of the key
 780       p += length;
 781
 782       p = next_property_value (p, &length);
 783       if (p)
 784         p += length;
 785
 786       property_count++;
 787     }
 788
 789   // Allocate an array of property value/key pairs.
 790   _Jv_Environment_Properties =
 791     (property_pair *) malloc (sizeof(property_pair)
 792                               * (property_count + 1));
 793
 794   // Go through the properties again, initializing _Jv_Properties
 795   // along the way.
 796   p = props;
 797   property_count = 0;
 798   while (p && (p = next_property_key (p, &length)))
 799     {
 800       _Jv_Environment_Properties[property_count].key = p;
 801       _Jv_Environment_Properties[property_count].key_length = length;
 802
 803       // Skip to the end of the key
 804       p += length;
 805
 806       p = next_property_value (p, &length);
 807
 808       _Jv_Environment_Properties[property_count].value = p;
 809       _Jv_Environment_Properties[property_count].value_length = length;
 810
 811       if (p)
 812         p += length;
 813
 814       property_count++;
 815     }
 816   memset ((void *) &_Jv_Environment_Properties[property_count],
 817           0, sizeof (property_pair));
 818   {
 819     size_t i = 0;
 820
 821     // Null terminate the strings.
 822     while (_Jv_Environment_Properties[i].key)
 823       {
 824         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 825         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 826       }
 827   }
 828 }
 829 #endif // DISABLE_GETENV_PROPERTIES
 830
 831 void
 832 JvRunMain (jclass klass, int argc, const char **argv)
 833 {
 834   PROCESS_GCJ_PROPERTIES;
 835
 836   _Jv_argv = argv;
 837   _Jv_argc = argc;
 838
 839   main_init ();
 840 #ifdef HAVE_PROC_SELF_EXE
 841   char exec_name[20];
 842   sprintf (exec_name, "/proc/%d/exe", getpid ());
 843   _Jv_ThisExecutable (exec_name);
 844 #else
 845   _Jv_ThisExecutable (argv[0]);
 846 #endif
 847
 848   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 849   main_thread = new gnu::gcj::runtime::FirstThread (klass, arg_vec);
 850
 851   main_thread->start();
 852   _Jv_ThreadWait ();
 853
 854   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 855
 856   java::lang::Runtime::getRuntime ()->_exit (status);
 857 }
 858
 859 void
 860 _Jv_RunMain (const char *name, int argc, const char **argv, bool is_jar)
 861 {
 862   jstring class_name;
 863   PROCESS_GCJ_PROPERTIES;
 864
 865   main_init ();
 866
 867 #ifdef HAVE_PROC_SELF_EXE
 868   char exec_name[20];
 869   sprintf (exec_name, "/proc/%d/exe", getpid ());
 870   _Jv_ThisExecutable (exec_name);
 871 #endif
 872
 873   if (is_jar)
 874     {
 875       // name specifies a jar file.  We must now extract the
 876       // Main-Class attribute from the jar's manifest file.  This is
 877       // done by gnu.gcj.runtime.FirstThread.main.
 878       _Jv_Jar_Class_Path = strdup (name);
 879       arg_vec = JvConvertArgv (1, &_Jv_Jar_Class_Path);
 880
 881       main_thread =
 882         new gnu::gcj::runtime::FirstThread (&gnu::gcj::runtime::FirstThread::class$,
 883                                             arg_vec);
 884       main_thread->start();
 885       _Jv_ThreadWait ();
 886
 887       // FirstThread.main extracts the main class name and stores it
 888       // here.
 889       class_name = gnu::gcj::runtime::FirstThread::jarMainClassName;
 890
 891       // We need a new ClassLoader because the classpath must be the
 892       // jar file only.  The easiest way to do this is to lose our
 893       // reference to the previous classloader.
 894       java::lang::ClassLoader::system = NULL;
 895     }
 896   else
 897     class_name = JvNewStringLatin1 (name);
 898
 899   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 900
 901   if (class_name)
 902     {
 903       main_thread = new gnu::gcj::runtime::FirstThread (class_name, arg_vec);
 904       main_thread->start();
 905       _Jv_ThreadWait ();
 906     }
 907
 908   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 909
 910   java::lang::Runtime::getRuntime ()->exit (status);
 911 }
 912
 913 \f
 914
 915 // Parse a string and return a heap size.
 916 static size_t
 917 parse_heap_size (const char *spec)
 918 {
 919   char *end;
 920   unsigned long val = strtoul (spec, &end, 10);
 921   if (*end == 'k' || *end == 'K')
 922     val *= 1024;
 923   else if (*end == 'm' || *end == 'M')
 924     val *= 1048576;
 925   return (size_t) val;
 926 }
 927
 928 // Set the initial heap size.  This might be ignored by the GC layer.
 929 // This must be called before _Jv_RunMain.
 930 void
 931 _Jv_SetInitialHeapSize (const char *arg)
 932 {
 933   size_t size = parse_heap_size (arg);
 934   _Jv_GCSetInitialHeapSize (size);
 935 }
 936
 937 // Set the maximum heap size.  This might be ignored by the GC layer.
 938 // This must be called before _Jv_RunMain.
 939 void
 940 _Jv_SetMaximumHeapSize (const char *arg)
 941 {
 942   size_t size = parse_heap_size (arg);
 943   _Jv_GCSetMaximumHeapSize (size);
 944 }
 945
 946 \f
 947
 948 void *
 949 _Jv_Malloc (jsize size)
 950 {
 951   if (__builtin_expect (size == 0, false))
 952     size = 1;
 953   void *ptr = malloc ((size_t) size);
 954   if (__builtin_expect (ptr == NULL, false))
 955     throw no_memory;
 956   return ptr;
 957 }
 958
 959 void *
 960 _Jv_Realloc (void *ptr, jsize size)
 961 {
 962   if (__builtin_expect (size == 0, false))
 963     size = 1;
 964   ptr = realloc (ptr, (size_t) size);
 965   if (__builtin_expect (ptr == NULL, false))
 966     throw no_memory;
 967   return ptr;
 968 }
 969
 970 void *
 971 _Jv_MallocUnchecked (jsize size)
 972 {
 973   if (__builtin_expect (size == 0, false))
 974     size = 1;
 975   return malloc ((size_t) size);
 976 }
 977
 978 void
 979 _Jv_Free (void* ptr)
 980 {
 981   return free (ptr);
 982 }
 983
 984 \f
 985
 986 // In theory, these routines can be #ifdef'd away on machines which
 987 // support divide overflow signals.  However, we never know if some
 988 // code might have been compiled with "-fuse-divide-subroutine", so we
 989 // always include them in libgcj.
 990
 991 jint
 992 _Jv_divI (jint dividend, jint divisor)
 993 {
 994   if (__builtin_expect (divisor == 0, false))
 995     _Jv_ThrowSignal (arithexception);
 996
 997   if (dividend == (jint) 0x80000000L && divisor == -1)
 998     return dividend;
 999
1000   return dividend / divisor;
1001 }
1002
1003 jint
1004 _Jv_remI (jint dividend, jint divisor)
1005 {
1006   if (__builtin_expect (divisor == 0, false))
1007     _Jv_ThrowSignal (arithexception);
1008
1009   if (dividend == (jint) 0x80000000L && divisor == -1)
1010     return 0;
1011
1012   return dividend % divisor;
1013 }
1014
1015 jlong
1016 _Jv_divJ (jlong dividend, jlong divisor)
1017 {
1018   if (__builtin_expect (divisor == 0, false))
1019     _Jv_ThrowSignal (arithexception);
1020
1021   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1022     return dividend;
1023
1024   return dividend / divisor;
1025 }
1026
1027 jlong
1028 _Jv_remJ (jlong dividend, jlong divisor)
1029 {
1030   if (__builtin_expect (divisor == 0, false))
1031     _Jv_ThrowSignal (arithexception);
1032
1033   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1034     return 0;
1035
1036   return dividend % divisor;
1037 }