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