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/Runtime.h>
  51 #include <java/lang/String.h>
  52 #include <java/lang/Thread.h>
  53 #include <java/lang/ThreadGroup.h>
  54 #include <gnu/gcj/runtime/FirstThread.h>
  55 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  56 #include <java/lang/ArithmeticException.h>
  57 #include <java/lang/ClassFormatError.h>
  58 #include <java/lang/NegativeArraySizeException.h>
  59 #include <java/lang/NullPointerException.h>
  60 #include <java/lang/OutOfMemoryError.h>
  61 #include <java/lang/System.h>
  62 #include <java/lang/reflect/Modifier.h>
  63 #include <java/io/PrintStream.h>
  64
  65 #ifdef USE_LTDL
  66 #include <ltdl.h>
  67 #endif
  68
  69 #define ObjectClass _CL_Q34java4lang6Object
  70 extern java::lang::Class ObjectClass;
  71
  72 // We allocate a single OutOfMemoryError exception which we keep
  73 // around for use if we run out of memory.
  74 static java::lang::OutOfMemoryError *no_memory;
  75
  76 // Largest representable size_t.
  77 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  78
  79 // Properties set at compile time.
  80 const char **_Jv_Compiler_Properties;
  81
  82 #ifndef DISABLE_GETENV_PROPERTIES
  83 // Property key/value pairs.
  84 property_pair *_Jv_Environment_Properties;
  85 #endif
  86
  87 // The name of this executable.
  88 static char * _Jv_execName;
  89
  90 #ifdef ENABLE_JVMPI
  91 // Pointer to JVMPI notification functions.
  92 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
  93 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
  94 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
  95 #endif
  96 \f
  97
  98 #ifdef HANDLE_SEGV
  99 static java::lang::NullPointerException *nullp;
 100 SIGNAL_HANDLER (catch_segv)
 101 {
 102   MAKE_THROW_FRAME;
 103   nullp->fillInStackTrace ();
 104   _Jv_Throw (nullp);
 105 }
 106 #endif
 107
 108 static java::lang::ArithmeticException *arithexception;
 109
 110 #ifdef HANDLE_FPE
 111 SIGNAL_HANDLER (catch_fpe)
 112 {
 113 #ifdef HANDLE_DIVIDE_OVERFLOW
 114   HANDLE_DIVIDE_OVERFLOW;
 115 #else
 116   MAKE_THROW_FRAME;
 117 #endif
 118   arithexception->fillInStackTrace ();
 119   _Jv_Throw (arithexception);
 120 }
 121 #endif
 122
 123 \f
 124
 125 jboolean
 126 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 127 {
 128   register int len;
 129   register _Jv_ushort *aptr, *bptr;
 130   if (a == b)
 131     return true;
 132   if (a->hash != b->hash)
 133     return false;
 134   len = a->length;
 135   if (b->length != len)
 136     return false;
 137   aptr = (_Jv_ushort *)a->data;
 138   bptr = (_Jv_ushort *)b->data;
 139   len = (len + 1) >> 1;
 140   while (--len >= 0)
 141     if (*aptr++ != *bptr++)
 142       return false;
 143   return true;
 144 }
 145
 146 /* True iff A is equal to STR.
 147    HASH is STR->hashCode().
 148 */
 149
 150 jboolean
 151 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 152 {
 153   if (a->hash != (_Jv_ushort) hash)
 154     return false;
 155   jint len = str->length();
 156   jint i = 0;
 157   jchar *sptr = _Jv_GetStringChars (str);
 158   register unsigned char* ptr = (unsigned char*) a->data;
 159   register unsigned char* limit = ptr + a->length;
 160   for (;; i++, sptr++)
 161     {
 162       int ch = UTF8_GET (ptr, limit);
 163       if (i == len)
 164         return ch < 0;
 165       if (ch != *sptr)
 166         return false;
 167     }
 168   return true;
 169 }
 170
 171 /* Like _Jv_equal, but stop after N characters.  */
 172 jboolean
 173 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 174 {
 175   jint len = str->length();
 176   jint i = 0;
 177   jchar *sptr = _Jv_GetStringChars (str);
 178   register unsigned char* ptr = (unsigned char*) a->data;
 179   register unsigned char* limit = ptr + a->length;
 180   for (; n-- > 0; i++, sptr++)
 181     {
 182       int ch = UTF8_GET (ptr, limit);
 183       if (i == len)
 184         return ch < 0;
 185       if (ch != *sptr)
 186         return false;
 187     }
 188   return true;
 189 }
 190
 191 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 192 int
 193 _Jv_strLengthUtf8(char* str, int len)
 194 {
 195   register unsigned char* ptr;
 196   register unsigned char* limit;
 197   int str_length;
 198
 199   ptr = (unsigned char*) str;
 200   limit = ptr + len;
 201   str_length = 0;
 202   for (; ptr < limit; str_length++) {
 203     if (UTF8_GET (ptr, limit) < 0) {
 204       return (-1);
 205     }
 206   }
 207   return (str_length);
 208 }
 209
 210 /* Calculate a hash value for a string encoded in Utf8 format.
 211  * This returns the same hash value as specified or java.lang.String.hashCode.
 212  */
 213 static jint
 214 hashUtf8String (char* str, int len)
 215 {
 216   register unsigned char* ptr = (unsigned char*) str;
 217   register unsigned char* limit = ptr + len;
 218   jint hash = 0;
 219
 220   for (; ptr < limit;)
 221     {
 222       int ch = UTF8_GET (ptr, limit);
 223       /* Updated specification from
 224          http://www.javasoft.com/docs/books/jls/clarify.html. */
 225       hash = (31 * hash) + ch;
 226     }
 227   return hash;
 228 }
 229
 230 _Jv_Utf8Const *
 231 _Jv_makeUtf8Const (char* s, int len)
 232 {
 233   if (len < 0)
 234     len = strlen (s);
 235   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 236   if (! m)
 237     JvThrow (no_memory);
 238   memcpy (m->data, s, len);
 239   m->data[len] = 0;
 240   m->length = len;
 241   m->hash = hashUtf8String (s, len) & 0xFFFF;
 242   return (m);
 243 }
 244
 245 _Jv_Utf8Const *
 246 _Jv_makeUtf8Const (jstring string)
 247 {
 248   jint hash = string->hashCode ();
 249   jint len = _Jv_GetStringUTFLength (string);
 250
 251   Utf8Const* m = (Utf8Const*)
 252     _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
 253
 254   m->hash = hash;
 255   m->length = len;
 256
 257   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 258   m->data[len] = 0;
 259
 260   return m;
 261 }
 262
 263 \f
 264
 265 #ifdef DEBUG
 266 void
 267 _Jv_Abort (const char *function, const char *file, int line,
 268            const char *message)
 269 #else
 270 void
 271 _Jv_Abort (const char *, const char *, int, const char *message)
 272 #endif
 273 {
 274 #ifdef DEBUG
 275   fprintf (stderr,
 276            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 277            message, function, file, line);
 278 #else
 279   java::io::PrintStream *err = java::lang::System::err;
 280   err->print(JvNewStringLatin1 ("libgcj failure: "));
 281   err->println(JvNewStringLatin1 (message));
 282   err->flush();
 283 #endif
 284   abort ();
 285 }
 286
 287 static void
 288 fail_on_finalization (jobject)
 289 {
 290   JvFail ("object was finalized");
 291 }
 292
 293 void
 294 _Jv_GCWatch (jobject obj)
 295 {
 296   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 297 }
 298
 299 void
 300 _Jv_ThrowBadArrayIndex(jint bad_index)
 301 {
 302   JvThrow (new java::lang::ArrayIndexOutOfBoundsException
 303            (java::lang::String::valueOf(bad_index)));
 304 }
 305
 306 // Allocate some unscanned memory and throw an exception if no memory.
 307 void *
 308 _Jv_AllocBytesChecked (jsize size)
 309 {
 310   void *r = _Jv_AllocBytes (size);
 311   if (! r)
 312     _Jv_Throw (no_memory);
 313   return r;
 314 }
 315
 316 // Allocate a new object of class C.  SIZE is the size of the object
 317 // to allocate.  You might think this is redundant, but it isn't; some
 318 // classes, such as String, aren't of fixed size.
 319 jobject
 320 _Jv_AllocObject (jclass c, jint size)
 321 {
 322   _Jv_InitClass (c);
 323
 324   jobject obj = (jobject) _Jv_AllocObj (size);
 325   if (! obj)
 326     JvThrow (no_memory);
 327   *((_Jv_VTable **) obj) = c->vtable;
 328
 329   // If this class has inherited finalize from Object, then don't
 330   // bother registering a finalizer.  We know that finalize() is the
 331   // very first method after the dummy entry.  If this turns out to be
 332   // unreliable, a more robust implementation can be written.  Such an
 333   // implementation would look for Object.finalize in Object's method
 334   // table at startup, and then use that information to find the
 335   // appropriate index in the method vector.
 336   if (c->vtable->method[1] != ObjectClass.vtable->method[1])
 337     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 338
 339 #ifdef ENABLE_JVMPI
 340   // Service JVMPI request.
 341
 342   if (_Jv_JVMPI_Notify_OBJECT_ALLOC)
 343     {
 344       JVMPI_Event event;
 345
 346       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 347       event.env_id = NULL;
 348       event.u.obj_alloc.arena_id = 0;
 349       event.u.obj_alloc.class_id = (jobjectID) c;
 350       event.u.obj_alloc.is_array = 0;
 351       event.u.obj_alloc.size = size;
 352       event.u.obj_alloc.obj_id = (jobjectID) obj;
 353
 354       _Jv_DisableGC ();
 355       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 356       _Jv_EnableGC ();
 357     }
 358 #endif
 359
 360   return obj;
 361 }
 362
 363 // Allocate a new array of Java objects.  Each object is of type
 364 // `elementClass'.  `init' is used to initialize each slot in the
 365 // array.
 366 jobjectArray
 367 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 368 {
 369   if (count < 0)
 370     JvThrow (new java::lang::NegativeArraySizeException);
 371
 372   JvAssert (! elementClass->isPrimitive ());
 373
 374   jobjectArray obj = NULL;
 375   size_t size = (size_t) _Jv_GetArrayElementFromElementType (obj,
 376                                                              elementClass);
 377
 378   // Check for overflow.
 379   if ((size_t) count > (SIZE_T_MAX - size) / sizeof (jobject))
 380     JvThrow (no_memory);
 381
 382   size += count * sizeof (jobject);
 383
 384   // FIXME: second argument should be "current loader" //
 385   jclass clas = _Jv_FindArrayClass (elementClass, 0);
 386
 387   obj = (jobjectArray) _Jv_AllocArray (size);
 388   if (! obj)
 389     JvThrow (no_memory);
 390   obj->length = count;
 391   jobject* ptr = elements(obj);
 392   // We know the allocator returns zeroed memory.  So don't bother
 393   // zeroing it again.
 394   if (init)
 395     {
 396       while (--count >= 0)
 397         *ptr++ = init;
 398     }
 399   // Set the vtbl last to avoid problems if the GC happens during the
 400   // window in this function between the allocation and this
 401   // assignment.
 402   *((_Jv_VTable **) obj) = clas->vtable;
 403   return obj;
 404 }
 405
 406 // Allocate a new array of primitives.  ELTYPE is the type of the
 407 // element, COUNT is the size of the array.
 408 jobject
 409 _Jv_NewPrimArray (jclass eltype, jint count)
 410 {
 411   int elsize = eltype->size();
 412   if (count < 0)
 413     JvThrow (new java::lang::NegativeArraySizeException ());
 414
 415   JvAssert (eltype->isPrimitive ());
 416   jobject dummy = NULL;
 417   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 418
 419   // Check for overflow.
 420   if ((size_t) count > (SIZE_T_MAX - size) / elsize)
 421     JvThrow (no_memory);
 422
 423   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count);
 424   if (! arr)
 425     JvThrow (no_memory);
 426   arr->length = count;
 427   // Note that we assume we are given zeroed memory by the allocator.
 428
 429   jclass klass = _Jv_FindArrayClass (eltype, 0);
 430   // Set the vtbl last to avoid problems if the GC happens during the
 431   // window in this function between the allocation and this
 432   // assignment.
 433   *((_Jv_VTable **) arr) = klass->vtable;
 434   return arr;
 435 }
 436
 437 jobject
 438 _Jv_NewArray (jint type, jint size)
 439 {
 440   switch (type)
 441     {
 442       case  4:  return JvNewBooleanArray (size);
 443       case  5:  return JvNewCharArray (size);
 444       case  6:  return JvNewFloatArray (size);
 445       case  7:  return JvNewDoubleArray (size);
 446       case  8:  return JvNewByteArray (size);
 447       case  9:  return JvNewShortArray (size);
 448       case 10:  return JvNewIntArray (size);
 449       case 11:  return JvNewLongArray (size);
 450     }
 451   JvFail ("newarray - bad type code");
 452   return NULL;                  // Placate compiler.
 453 }
 454
 455 jobject
 456 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 457 {
 458   JvAssert (type->isArray());
 459   jclass element_type = type->getComponentType();
 460   jobject result;
 461   if (element_type->isPrimitive())
 462     result = _Jv_NewPrimArray (element_type, sizes[0]);
 463   else
 464     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 465
 466   if (dimensions > 1)
 467     {
 468       JvAssert (! element_type->isPrimitive());
 469       JvAssert (element_type->isArray());
 470       jobject *contents = elements ((jobjectArray) result);
 471       for (int i = 0; i < sizes[0]; ++i)
 472         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 473                                          sizes + 1);
 474     }
 475
 476   return result;
 477 }
 478
 479 jobject
 480 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 481 {
 482   va_list args;
 483   jint sizes[dimensions];
 484   va_start (args, dimensions);
 485   for (int i = 0; i < dimensions; ++i)
 486     {
 487       jint size = va_arg (args, jint);
 488       sizes[i] = size;
 489     }
 490   va_end (args);
 491
 492   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 493 }
 494
 495 \f
 496
 497 class _Jv_PrimClass : public java::lang::Class
 498 {
 499 public:
 500   // FIXME: calling convention is weird.  If we use the natural types
 501   // then the compiler will complain because they aren't Java types.
 502   _Jv_PrimClass (jobject cname, jbyte sig, jint len)
 503     {
 504       using namespace java::lang::reflect;
 505
 506       // We must initialize every field of the class.  We do this in
 507       // the same order they are declared in Class.h.
 508       next = NULL;
 509       name = _Jv_makeUtf8Const ((char *) cname, -1);
 510       accflags = Modifier::PUBLIC | Modifier::FINAL;
 511       superclass = NULL;
 512       constants.size = 0;
 513       constants.tags = NULL;
 514       constants.data = NULL;
 515       methods = NULL;
 516       method_count = sig;
 517       vtable_method_count = 0;
 518       fields = NULL;
 519       size_in_bytes = len;
 520       field_count = 0;
 521       static_field_count = 0;
 522       vtable = JV_PRIMITIVE_VTABLE;
 523       interfaces = NULL;
 524       loader = NULL;
 525       interface_count = 0;
 526       state = JV_STATE_NOTHING;
 527       thread = NULL;
 528     }
 529 };
 530
 531 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
 532   _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN)
 533
 534 DECLARE_PRIM_TYPE(byte, 'B', 1);
 535 DECLARE_PRIM_TYPE(short, 'S', 2);
 536 DECLARE_PRIM_TYPE(int, 'I', 4);
 537 DECLARE_PRIM_TYPE(long, 'J', 8);
 538 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 539 DECLARE_PRIM_TYPE(char, 'C', 2);
 540 DECLARE_PRIM_TYPE(float, 'F', 4);
 541 DECLARE_PRIM_TYPE(double, 'D', 8);
 542 DECLARE_PRIM_TYPE(void, 'V', 0);
 543
 544 jclass
 545 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 546 {
 547   switch (*sig)
 548     {
 549     case 'B':
 550       return JvPrimClass (byte);
 551     case 'S':
 552       return JvPrimClass (short);
 553     case 'I':
 554       return JvPrimClass (int);
 555     case 'J':
 556       return JvPrimClass (long);
 557     case 'Z':
 558       return JvPrimClass (boolean);
 559     case 'C':
 560       return JvPrimClass (char);
 561     case 'F':
 562       return JvPrimClass (float);
 563     case 'D':
 564       return JvPrimClass (double);
 565     case 'V':
 566       return JvPrimClass (void);
 567     case 'L':
 568       {
 569         int i;
 570         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 571           ;
 572         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 573         return _Jv_FindClass (name, loader);
 574
 575       }
 576     case '[':
 577       return _Jv_FindArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
 578                                  loader);
 579     }
 580   JvFail ("couldn't understand class signature");
 581   return NULL;                  // Placate compiler.
 582 }
 583
 584 \f
 585
 586 JArray<jstring> *
 587 JvConvertArgv (int argc, const char **argv)
 588 {
 589   if (argc < 0)
 590     argc = 0;
 591   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 592   jobject* ptr = elements(ar);
 593   for (int i = 0;  i < argc;  i++)
 594     {
 595       const char *arg = argv[i];
 596       // FIXME - should probably use JvNewStringUTF.
 597       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 598     }
 599   return (JArray<jstring>*) ar;
 600 }
 601
 602 // FIXME: These variables are static so that they will be
 603 // automatically scanned by the Boehm collector.  This is needed
 604 // because with qthreads the collector won't scan the initial stack --
 605 // it will only scan the qthreads stacks.
 606
 607 // Command line arguments.
 608 static jobject arg_vec;
 609
 610 // The primary threadgroup.
 611 static java::lang::ThreadGroup *main_group;
 612
 613 // The primary thread.
 614 static java::lang::Thread *main_thread;
 615
 616 char *
 617 _Jv_ThisExecutable (void)
 618 {
 619   return _Jv_execName;
 620 }
 621
 622 void
 623 _Jv_ThisExecutable (const char *name)
 624 {
 625   if (name)
 626     {
 627       _Jv_execName = new char[strlen (name) + 1];
 628       strcpy (_Jv_execName, name);
 629     }
 630 }
 631
 632 #ifdef USE_WIN32_SIGNALLING
 633
 634 extern "C" int* win32_get_restart_frame (void *);
 635
 636 LONG CALLBACK
 637 win32_exception_handler (LPEXCEPTION_POINTERS e)
 638 {
 639   int* setjmp_buf;
 640   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 641     setjmp_buf = win32_get_restart_frame (nullp);
 642   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 643     setjmp_buf = win32_get_restart_frame (arithexception);
 644   else
 645     return EXCEPTION_CONTINUE_SEARCH;
 646
 647   e->ContextRecord->Ebp = setjmp_buf[0];
 648   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 649   e->ContextRecord->Eip = setjmp_buf[1];
 650   // FIXME: Is this the stack pointer? Do we need it?
 651   e->ContextRecord->Esp = setjmp_buf[2];
 652
 653   return EXCEPTION_CONTINUE_EXECUTION;
 654 }
 655
 656 #endif
 657
 658 static void
 659 main_init ()
 660 {
 661   INIT_SEGV;
 662 #ifdef HANDLE_FPE
 663   INIT_FPE;
 664 #else
 665   arithexception = new java::lang::ArithmeticException
 666     (JvNewStringLatin1 ("/ by zero"));
 667 #endif
 668
 669   no_memory = new java::lang::OutOfMemoryError;
 670
 671 #ifdef USE_LTDL
 672   LTDL_SET_PRELOADED_SYMBOLS ();
 673 #endif
 674
 675 #ifdef USE_WINSOCK
 676   // Initialise winsock for networking
 677   WSADATA data;
 678   if (WSAStartup (MAKEWORD (1, 1), &data))
 679       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 680 #endif /* USE_WINSOCK */
 681
 682 #ifdef USE_WIN32_SIGNALLING
 683   // Install exception handler
 684   SetUnhandledExceptionFilter (win32_exception_handler);
 685 #else
 686   // We only want this on POSIX systems.
 687   struct sigaction act;
 688   act.sa_handler = SIG_IGN;
 689   sigemptyset (&act.sa_mask);
 690   act.sa_flags = 0;
 691   sigaction (SIGPIPE, &act, NULL);
 692 #endif /* USE_WIN32_SIGNALLING */
 693
 694   _Jv_JNI_Init ();
 695 }
 696
 697 #ifndef DISABLE_GETENV_PROPERTIES
 698
 699 static char *
 700 next_property_key (char *s, size_t *length)
 701 {
 702   size_t l = 0;
 703
 704   JvAssert (s);
 705
 706   // Skip over whitespace
 707   while (isspace (*s))
 708     s++;
 709
 710   // If we've reached the end, return NULL.  Also return NULL if for
 711   // some reason we've come across a malformed property string.
 712   if (*s == 0
 713       || *s == ':'
 714       || *s == '=')
 715     return NULL;
 716
 717   // Determine the length of the property key.
 718   while (s[l] != 0
 719          && ! isspace (s[l])
 720          && s[l] != ':'
 721          && s[l] != '=')
 722     {
 723       if (s[l] == '\\'
 724           && s[l+1] != 0)
 725         l++;
 726       l++;
 727     }
 728
 729   *length = l;
 730
 731   return s;
 732 }
 733
 734 static char *
 735 next_property_value (char *s, size_t *length)
 736 {
 737   size_t l = 0;
 738
 739   JvAssert (s);
 740
 741   while (isspace (*s))
 742     s++;
 743
 744   if (*s == ':'
 745       || *s == '=')
 746     s++;
 747
 748   while (isspace (*s))
 749     s++;
 750
 751   // If we've reached the end, return NULL.
 752   if (*s == 0)
 753     return NULL;
 754
 755   // Determine the length of the property value.
 756   while (s[l] != 0
 757          && ! isspace (s[l])
 758          && s[l] != ':'
 759          && s[l] != '=')
 760     {
 761       if (s[l] == '\\'
 762           && s[l+1] != 0)
 763         l += 2;
 764       else
 765         l++;
 766     }
 767
 768   *length = l;
 769
 770   return s;
 771 }
 772
 773 static void
 774 process_gcj_properties ()
 775 {
 776   char *props = getenv("GCJ_PROPERTIES");
 777   char *p = props;
 778   size_t length;
 779   size_t property_count = 0;
 780
 781   if (NULL == props)
 782     return;
 783
 784   // Whip through props quickly in order to count the number of
 785   // property values.
 786   while (p && (p = next_property_key (p, &length)))
 787     {
 788       // Skip to the end of the key
 789       p += length;
 790
 791       p = next_property_value (p, &length);
 792       if (p)
 793         p += length;
 794
 795       property_count++;
 796     }
 797
 798   // Allocate an array of property value/key pairs.
 799   _Jv_Environment_Properties =
 800     (property_pair *) malloc (sizeof(property_pair)
 801                               * (property_count + 1));
 802
 803   // Go through the properties again, initializing _Jv_Properties
 804   // along the way.
 805   p = props;
 806   property_count = 0;
 807   while (p && (p = next_property_key (p, &length)))
 808     {
 809       _Jv_Environment_Properties[property_count].key = p;
 810       _Jv_Environment_Properties[property_count].key_length = length;
 811
 812       // Skip to the end of the key
 813       p += length;
 814
 815       p = next_property_value (p, &length);
 816
 817       _Jv_Environment_Properties[property_count].value = p;
 818       _Jv_Environment_Properties[property_count].value_length = length;
 819
 820       if (p)
 821         p += length;
 822
 823       property_count++;
 824     }
 825   memset ((void *) &_Jv_Environment_Properties[property_count],
 826           0, sizeof (property_pair));
 827   {
 828     size_t i = 0;
 829
 830     // Null terminate the strings.
 831     while (_Jv_Environment_Properties[i].key)
 832       {
 833         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 834         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 835       }
 836   }
 837 }
 838 #endif // DISABLE_GETENV_PROPERTIES
 839
 840 void
 841 JvRunMain (jclass klass, int argc, const char **argv)
 842 {
 843   PROCESS_GCJ_PROPERTIES;
 844
 845   main_init ();
 846 #ifdef HAVE_PROC_SELF_EXE
 847   char exec_name[20];
 848   sprintf (exec_name, "/proc/%d/exe", getpid ());
 849   _Jv_ThisExecutable (exec_name);
 850 #else
 851   _Jv_ThisExecutable (argv[0]);
 852 #endif
 853
 854   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 855   main_group = new java::lang::ThreadGroup (23);
 856   main_thread = new gnu::gcj::runtime::FirstThread (main_group,
 857                                                     klass, arg_vec);
 858
 859   main_thread->start();
 860   _Jv_ThreadWait ();
 861
 862   java::lang::Runtime::getRuntime ()->exit (0);
 863 }
 864
 865 void
 866 _Jv_RunMain (const char *class_name, int argc, const char **argv)
 867 {
 868   PROCESS_GCJ_PROPERTIES;
 869
 870   main_init ();
 871
 872 #ifdef HAVE_PROC_SELF_EXE
 873   char exec_name[20];
 874   sprintf (exec_name, "/proc/%d/exe", getpid ());
 875   _Jv_ThisExecutable (exec_name);
 876 #endif
 877
 878   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 879   main_group = new java::lang::ThreadGroup (23);
 880   main_thread = new gnu::gcj::runtime::FirstThread (main_group,
 881                                                     JvNewStringLatin1 (class_name),
 882                                                     arg_vec);
 883   main_thread->start();
 884   _Jv_ThreadWait ();
 885
 886   java::lang::Runtime::getRuntime ()->exit (0);
 887 }
 888
 889 \f
 890
 891 // Parse a string and return a heap size.
 892 static size_t
 893 parse_heap_size (const char *spec)
 894 {
 895   char *end;
 896   unsigned long val = strtoul (spec, &end, 10);
 897   if (*end == 'k' || *end == 'K')
 898     val *= 1024;
 899   else if (*end == 'm' || *end == 'M')
 900     val *= 1048576;
 901   return (size_t) val;
 902 }
 903
 904 // Set the initial heap size.  This might be ignored by the GC layer.
 905 // This must be called before _Jv_RunMain.
 906 void
 907 _Jv_SetInitialHeapSize (const char *arg)
 908 {
 909   size_t size = parse_heap_size (arg);
 910   _Jv_GCSetInitialHeapSize (size);
 911 }
 912
 913 // Set the maximum heap size.  This might be ignored by the GC layer.
 914 // This must be called before _Jv_RunMain.
 915 void
 916 _Jv_SetMaximumHeapSize (const char *arg)
 917 {
 918   size_t size = parse_heap_size (arg);
 919   _Jv_GCSetMaximumHeapSize (size);
 920 }
 921
 922 \f
 923
 924 void *
 925 _Jv_Malloc (jsize size)
 926 {
 927   if (size == 0)
 928     size = 1;
 929   void *ptr = malloc ((size_t) size);
 930   if (ptr == NULL)
 931     JvThrow (no_memory);
 932   return ptr;
 933 }
 934
 935 void *
 936 _Jv_Realloc (void *ptr, jsize size)
 937 {
 938   if (size == 0)
 939     size = 1;
 940   ptr = realloc (ptr, (size_t) size);
 941   if (ptr == NULL)
 942     JvThrow (no_memory);
 943   return ptr;
 944 }
 945
 946 void *
 947 _Jv_MallocUnchecked (jsize size)
 948 {
 949   if (size == 0)
 950     size = 1;
 951   return malloc ((size_t) size);
 952 }
 953
 954 void
 955 _Jv_Free (void* ptr)
 956 {
 957   return free (ptr);
 958 }
 959
 960 \f
 961
 962 // In theory, these routines can be #ifdef'd away on machines which
 963 // support divide overflow signals.  However, we never know if some
 964 // code might have been compiled with "-fuse-divide-subroutine", so we
 965 // always include them in libgcj.
 966
 967 jint
 968 _Jv_divI (jint dividend, jint divisor)
 969 {
 970   if (divisor == 0)
 971     _Jv_Throw (arithexception);
 972
 973   if (dividend == (jint) 0x80000000L && divisor == -1)
 974     return dividend;
 975
 976   return dividend / divisor;
 977 }
 978
 979 jint
 980 _Jv_remI (jint dividend, jint divisor)
 981 {
 982   if (divisor == 0)
 983     _Jv_Throw (arithexception);
 984
 985   if (dividend == (jint) 0x80000000L && divisor == -1)
 986     return 0;
 987
 988   return dividend % divisor;
 989 }
 990
 991 jlong
 992 _Jv_divJ (jlong dividend, jlong divisor)
 993 {
 994   if (divisor == 0)
 995     _Jv_Throw (arithexception);
 996
 997   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
 998     return dividend;
 999
1000   return dividend / divisor;
1001 }
1002
1003 jlong
1004 _Jv_remJ (jlong dividend, jlong divisor)
1005 {
1006   if (divisor == 0)
1007     _Jv_Throw (arithexception);
1008
1009   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1010     return 0;
1011
1012   return dividend % divisor;
1013 }