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 #include <java/lang/ThreadGroup.h>
  40 #endif
  41
  42 #ifndef DISABLE_GETENV_PROPERTIES
  43 #include <ctype.h>
  44 #include <java-props.h>
  45 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  46 #else
  47 #define PROCESS_GCJ_PROPERTIES
  48 #endif // DISABLE_GETENV_PROPERTIES
  49
  50 #include <java/lang/Class.h>
  51 #include <java/lang/ClassLoader.h>
  52 #include <java/lang/Runtime.h>
  53 #include <java/lang/String.h>
  54 #include <java/lang/Thread.h>
  55 #include <java/lang/ThreadGroup.h>
  56 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  57 #include <java/lang/ArithmeticException.h>
  58 #include <java/lang/ClassFormatError.h>
  59 #include <java/lang/InternalError.h>
  60 #include <java/lang/NegativeArraySizeException.h>
  61 #include <java/lang/NullPointerException.h>
  62 #include <java/lang/OutOfMemoryError.h>
  63 #include <java/lang/System.h>
  64 #include <java/lang/reflect/Modifier.h>
  65 #include <java/io/PrintStream.h>
  66 #include <java/lang/UnsatisfiedLinkError.h>
  67 #include <java/lang/VirtualMachineError.h>
  68 #include <gnu/gcj/runtime/VMClassLoader.h>
  69 #include <gnu/gcj/runtime/FinalizerThread.h>
  70 #include <gnu/gcj/runtime/FirstThread.h>
  71
  72 #ifdef USE_LTDL
  73 #include <ltdl.h>
  74 #endif
  75
  76 // We allocate a single OutOfMemoryError exception which we keep
  77 // around for use if we run out of memory.
  78 static java::lang::OutOfMemoryError *no_memory;
  79
  80 // Largest representable size_t.
  81 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  82
  83 static const char *no_properties[] = { NULL };
  84
  85 // Properties set at compile time.
  86 const char **_Jv_Compiler_Properties = no_properties;
  87
  88 // The JAR file to add to the beginning of java.class.path.
  89 const char *_Jv_Jar_Class_Path;
  90
  91 #ifndef DISABLE_GETENV_PROPERTIES
  92 // Property key/value pairs.
  93 property_pair *_Jv_Environment_Properties;
  94 #endif
  95
  96 // The name of this executable.
  97 static char *_Jv_execName;
  98
  99 // Stash the argv pointer to benefit native libraries that need it.
 100 const char **_Jv_argv;
 101 int _Jv_argc;
 102
 103 #ifdef ENABLE_JVMPI
 104 // Pointer to JVMPI notification functions.
 105 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 106 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 107 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 108 #endif
 109 \f
 110
 111 extern "C" void _Jv_ThrowSignal (jthrowable) __attribute ((noreturn));
 112
 113 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 114 // this is declared extern in order that its name not be mangled, it
 115 // is not intended to be used outside this file.
 116 void
 117 _Jv_ThrowSignal (jthrowable throwable)
 118 {
 119   throwable->fillInStackTrace ();
 120   throw throwable;
 121 }
 122
 123 #ifdef HANDLE_SEGV
 124 static java::lang::NullPointerException *nullp;
 125
 126 SIGNAL_HANDLER (catch_segv)
 127 {
 128   MAKE_THROW_FRAME (nullp);
 129   _Jv_ThrowSignal (nullp);
 130 }
 131 #endif
 132
 133 static java::lang::ArithmeticException *arithexception;
 134
 135 #ifdef HANDLE_FPE
 136 SIGNAL_HANDLER (catch_fpe)
 137 {
 138 #ifdef HANDLE_DIVIDE_OVERFLOW
 139   HANDLE_DIVIDE_OVERFLOW;
 140 #else
 141   MAKE_THROW_FRAME (arithexception);
 142 #endif
 143   _Jv_ThrowSignal (arithexception);
 144 }
 145 #endif
 146
 147 \f
 148
 149 jboolean
 150 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 151 {
 152   int len;
 153   _Jv_ushort *aptr, *bptr;
 154   if (a == b)
 155     return true;
 156   if (a->hash != b->hash)
 157     return false;
 158   len = a->length;
 159   if (b->length != len)
 160     return false;
 161   aptr = (_Jv_ushort *)a->data;
 162   bptr = (_Jv_ushort *)b->data;
 163   len = (len + 1) >> 1;
 164   while (--len >= 0)
 165     if (*aptr++ != *bptr++)
 166       return false;
 167   return true;
 168 }
 169
 170 /* True iff A is equal to STR.
 171    HASH is STR->hashCode().
 172 */
 173
 174 jboolean
 175 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 176 {
 177   if (a->hash != (_Jv_ushort) hash)
 178     return false;
 179   jint len = str->length();
 180   jint i = 0;
 181   jchar *sptr = _Jv_GetStringChars (str);
 182   unsigned char* ptr = (unsigned char*) a->data;
 183   unsigned char* limit = ptr + a->length;
 184   for (;; i++, sptr++)
 185     {
 186       int ch = UTF8_GET (ptr, limit);
 187       if (i == len)
 188         return ch < 0;
 189       if (ch != *sptr)
 190         return false;
 191     }
 192   return true;
 193 }
 194
 195 /* Like _Jv_equal, but stop after N characters.  */
 196 jboolean
 197 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 198 {
 199   jint len = str->length();
 200   jint i = 0;
 201   jchar *sptr = _Jv_GetStringChars (str);
 202   unsigned char* ptr = (unsigned char*) a->data;
 203   unsigned char* limit = ptr + a->length;
 204   for (; n-- > 0; i++, sptr++)
 205     {
 206       int ch = UTF8_GET (ptr, limit);
 207       if (i == len)
 208         return ch < 0;
 209       if (ch != *sptr)
 210         return false;
 211     }
 212   return true;
 213 }
 214
 215 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 216 int
 217 _Jv_strLengthUtf8(char* str, int len)
 218 {
 219   unsigned char* ptr;
 220   unsigned char* limit;
 221   int str_length;
 222
 223   ptr = (unsigned char*) str;
 224   limit = ptr + len;
 225   str_length = 0;
 226   for (; ptr < limit; str_length++)
 227     {
 228       if (UTF8_GET (ptr, limit) < 0)
 229         return (-1);
 230     }
 231   return (str_length);
 232 }
 233
 234 /* Calculate a hash value for a string encoded in Utf8 format.
 235  * This returns the same hash value as specified or java.lang.String.hashCode.
 236  */
 237 static jint
 238 hashUtf8String (char* str, int len)
 239 {
 240   unsigned char* ptr = (unsigned char*) str;
 241   unsigned char* limit = ptr + len;
 242   jint hash = 0;
 243
 244   for (; ptr < limit;)
 245     {
 246       int ch = UTF8_GET (ptr, limit);
 247       /* Updated specification from
 248          http://www.javasoft.com/docs/books/jls/clarify.html. */
 249       hash = (31 * hash) + ch;
 250     }
 251   return hash;
 252 }
 253
 254 _Jv_Utf8Const *
 255 _Jv_makeUtf8Const (char* s, int len)
 256 {
 257   if (len < 0)
 258     len = strlen (s);
 259   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 260   memcpy (m->data, s, len);
 261   m->data[len] = 0;
 262   m->length = len;
 263   m->hash = hashUtf8String (s, len) & 0xFFFF;
 264   return (m);
 265 }
 266
 267 _Jv_Utf8Const *
 268 _Jv_makeUtf8Const (jstring string)
 269 {
 270   jint hash = string->hashCode ();
 271   jint len = _Jv_GetStringUTFLength (string);
 272
 273   Utf8Const* m = (Utf8Const*)
 274     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 275
 276   m->hash = hash;
 277   m->length = len;
 278
 279   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 280   m->data[len] = 0;
 281
 282   return m;
 283 }
 284
 285 \f
 286
 287 #ifdef DEBUG
 288 void
 289 _Jv_Abort (const char *function, const char *file, int line,
 290            const char *message)
 291 #else
 292 void
 293 _Jv_Abort (const char *, const char *, int, const char *message)
 294 #endif
 295 {
 296 #ifdef DEBUG
 297   fprintf (stderr,
 298            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 299            message, function, file, line);
 300 #else
 301   fprintf (stderr, "libgcj failure: %s\n", message);
 302 #endif
 303   abort ();
 304 }
 305
 306 static void
 307 fail_on_finalization (jobject)
 308 {
 309   JvFail ("object was finalized");
 310 }
 311
 312 void
 313 _Jv_GCWatch (jobject obj)
 314 {
 315   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 316 }
 317
 318 void
 319 _Jv_ThrowBadArrayIndex(jint bad_index)
 320 {
 321   throw new java::lang::ArrayIndexOutOfBoundsException
 322     (java::lang::String::valueOf (bad_index));
 323 }
 324
 325 void
 326 _Jv_ThrowNullPointerException ()
 327 {
 328   throw new java::lang::NullPointerException;
 329 }
 330
 331 // Explicitly throw a no memory exception.
 332 // The collector calls this when it encounters an out-of-memory condition.
 333 void _Jv_ThrowNoMemory()
 334 {
 335   throw no_memory;
 336 }
 337
 338 #ifdef ENABLE_JVMPI
 339 static void
 340 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 341 {
 342   // Service JVMPI allocation request.
 343   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 344     {
 345       JVMPI_Event event;
 346
 347       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 348       event.env_id = NULL;
 349       event.u.obj_alloc.arena_id = 0;
 350       event.u.obj_alloc.class_id = (jobjectID) klass;
 351       event.u.obj_alloc.is_array = 0;
 352       event.u.obj_alloc.size = size;
 353       event.u.obj_alloc.obj_id = (jobjectID) obj;
 354
 355       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 356       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 357       // More importantly, I don't see the need for disabling GC, since we
 358       // blatantly have a pointer to obj on our stack, ensuring that the
 359       // object can't be collected.  Even for a nonconservative collector,
 360       // it appears to me that this must be true, since we are about to
 361       // return obj. Isn't this whole approach way too intrusive for
 362       // a useful profiling interface?                  - HB
 363       _Jv_DisableGC ();
 364       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 365       _Jv_EnableGC ();
 366     }
 367 }
 368 #else /* !ENABLE_JVMPI */
 369 # define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 370 #endif
 371
 372 // Allocate a new object of class KLASS.  SIZE is the size of the object
 373 // to allocate.  You might think this is redundant, but it isn't; some
 374 // classes, such as String, aren't of fixed size.
 375 // First a version that assumes that we have no finalizer, and that
 376 // the class is already initialized.
 377 // If we know that JVMPI is disabled, this can be replaced by a direct call
 378 // to the allocator for the appropriate GC.
 379 jobject
 380 _Jv_AllocObjectNoInitNoFinalizer (jclass klass, jint size)
 381 {
 382   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 383   jvmpi_notify_alloc (klass, size, obj);
 384   return obj;
 385 }
 386
 387 // And now a version that initializes if necessary.
 388 jobject
 389 _Jv_AllocObjectNoFinalizer (jclass klass, jint size)
 390 {
 391   _Jv_InitClass (klass);
 392   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 393   jvmpi_notify_alloc (klass, size, obj);
 394   return obj;
 395 }
 396
 397 // And now the general version that registers a finalizer if necessary.
 398 jobject
 399 _Jv_AllocObject (jclass klass, jint size)
 400 {
 401   jobject obj = _Jv_AllocObjectNoFinalizer (klass, size);
 402
 403   // We assume that the compiler only generates calls to this routine
 404   // if there really is an interesting finalizer.
 405   // Unfortunately, we still have to the dynamic test, since there may
 406   // be cni calls to this routine.
 407   // Nore that on IA64 get_finalizer() returns the starting address of the
 408   // function, not a function pointer.  Thus this still works.
 409   if (klass->vtable->get_finalizer ()
 410       != java::lang::Object::class$.vtable->get_finalizer ())
 411     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 412   return obj;
 413 }
 414
 415 // A version of the above that assumes the object contains no pointers,
 416 // and requires no finalization.  This can't happen if we need pointers
 417 // to locks.
 418 #ifdef JV_HASH_SYNCHRONIZATION
 419 jobject
 420 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 421 {
 422   _Jv_InitClass (klass);
 423
 424   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 425
 426 #ifdef ENABLE_JVMPI
 427   // Service JVMPI request.
 428
 429   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 430     {
 431       JVMPI_Event event;
 432
 433       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 434       event.env_id = NULL;
 435       event.u.obj_alloc.arena_id = 0;
 436       event.u.obj_alloc.class_id = (jobjectID) klass;
 437       event.u.obj_alloc.is_array = 0;
 438       event.u.obj_alloc.size = size;
 439       event.u.obj_alloc.obj_id = (jobjectID) obj;
 440
 441       _Jv_DisableGC ();
 442       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 443       _Jv_EnableGC ();
 444     }
 445 #endif
 446
 447   return obj;
 448 }
 449 #endif /* JV_HASH_SYNCHRONIZATION */
 450
 451
 452 // Allocate a new array of Java objects.  Each object is of type
 453 // `elementClass'.  `init' is used to initialize each slot in the
 454 // array.
 455 jobjectArray
 456 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 457 {
 458   if (__builtin_expect (count < 0, false))
 459     throw new java::lang::NegativeArraySizeException;
 460
 461   JvAssert (! elementClass->isPrimitive ());
 462
 463   // Ensure that elements pointer is properly aligned.
 464   jobjectArray obj = NULL;
 465   size_t size = (size_t) elements (obj);
 466   size += count * sizeof (jobject);
 467
 468   // FIXME: second argument should be "current loader"
 469   jclass klass = _Jv_GetArrayClass (elementClass, 0);
 470
 471   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 472   // Cast away const.
 473   jsize *lp = const_cast<jsize *> (&obj->length);
 474   *lp = count;
 475   // We know the allocator returns zeroed memory.  So don't bother
 476   // zeroing it again.
 477   if (init)
 478     {
 479       jobject *ptr = elements(obj);
 480       while (--count >= 0)
 481         *ptr++ = init;
 482     }
 483   return obj;
 484 }
 485
 486 // Allocate a new array of primitives.  ELTYPE is the type of the
 487 // element, COUNT is the size of the array.
 488 jobject
 489 _Jv_NewPrimArray (jclass eltype, jint count)
 490 {
 491   int elsize = eltype->size();
 492   if (__builtin_expect (count < 0, false))
 493     throw new java::lang::NegativeArraySizeException;
 494
 495   JvAssert (eltype->isPrimitive ());
 496   jobject dummy = NULL;
 497   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 498
 499   // Check for overflow.
 500   if (__builtin_expect ((size_t) count >
 501                         (SIZE_T_MAX - size) / elsize, false))
 502     throw no_memory;
 503
 504   jclass klass = _Jv_GetArrayClass (eltype, 0);
 505
 506 # ifdef JV_HASH_SYNCHRONIZATION
 507   // Since the vtable is always statically allocated,
 508   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 509   __JArray *arr =
 510     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 511   memset((char *)arr + size, 0, elsize * count);
 512 # else
 513   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 514   // Note that we assume we are given zeroed memory by the allocator.
 515 # endif
 516   // Cast away const.
 517   jsize *lp = const_cast<jsize *> (&arr->length);
 518   *lp = count;
 519
 520   return arr;
 521 }
 522
 523 jobject
 524 _Jv_NewArray (jint type, jint size)
 525 {
 526   switch (type)
 527     {
 528       case  4:  return JvNewBooleanArray (size);
 529       case  5:  return JvNewCharArray (size);
 530       case  6:  return JvNewFloatArray (size);
 531       case  7:  return JvNewDoubleArray (size);
 532       case  8:  return JvNewByteArray (size);
 533       case  9:  return JvNewShortArray (size);
 534       case 10:  return JvNewIntArray (size);
 535       case 11:  return JvNewLongArray (size);
 536     }
 537   throw new java::lang::InternalError
 538     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 539 }
 540
 541 // Allocate a possibly multi-dimensional array but don't check that
 542 // any array length is <0.
 543 static jobject
 544 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 545 {
 546   JvAssert (type->isArray());
 547   jclass element_type = type->getComponentType();
 548   jobject result;
 549   if (element_type->isPrimitive())
 550     result = _Jv_NewPrimArray (element_type, sizes[0]);
 551   else
 552     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 553
 554   if (dimensions > 1)
 555     {
 556       JvAssert (! element_type->isPrimitive());
 557       JvAssert (element_type->isArray());
 558       jobject *contents = elements ((jobjectArray) result);
 559       for (int i = 0; i < sizes[0]; ++i)
 560         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 561                                                   sizes + 1);
 562     }
 563
 564   return result;
 565 }
 566
 567 jobject
 568 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 569 {
 570   for (int i = 0; i < dimensions; ++i)
 571     if (sizes[i] < 0)
 572       throw new java::lang::NegativeArraySizeException;
 573
 574   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 575 }
 576
 577 jobject
 578 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 579 {
 580   va_list args;
 581   jint sizes[dimensions];
 582   va_start (args, dimensions);
 583   for (int i = 0; i < dimensions; ++i)
 584     {
 585       jint size = va_arg (args, jint);
 586       if (size < 0)
 587         throw new java::lang::NegativeArraySizeException;
 588       sizes[i] = size;
 589     }
 590   va_end (args);
 591
 592   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 593 }
 594
 595 \f
 596
 597 #define DECLARE_PRIM_TYPE(NAME)                 \
 598   _Jv_ArrayVTable _Jv_##NAME##VTable;           \
 599   java::lang::Class _Jv_##NAME##Class;
 600
 601 DECLARE_PRIM_TYPE(byte);
 602 DECLARE_PRIM_TYPE(short);
 603 DECLARE_PRIM_TYPE(int);
 604 DECLARE_PRIM_TYPE(long);
 605 DECLARE_PRIM_TYPE(boolean);
 606 DECLARE_PRIM_TYPE(char);
 607 DECLARE_PRIM_TYPE(float);
 608 DECLARE_PRIM_TYPE(double);
 609 DECLARE_PRIM_TYPE(void);
 610
 611 void
 612 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len,
 613                    _Jv_ArrayVTable *array_vtable)
 614 {
 615   using namespace java::lang::reflect;
 616
 617   _Jv_InitNewClassFields (cl);
 618
 619   // We must set the vtable for the class; the Java constructor
 620   // doesn't do this.
 621   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 622
 623   // Initialize the fields we care about.  We do this in the same
 624   // order they are declared in Class.h.
 625   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 626   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 627   cl->method_count = sig;
 628   cl->size_in_bytes = len;
 629   cl->vtable = JV_PRIMITIVE_VTABLE;
 630   cl->state = JV_STATE_DONE;
 631   cl->depth = -1;
 632   if (sig != 'V')
 633     _Jv_NewArrayClass (cl, NULL, (_Jv_VTable *) array_vtable);
 634 }
 635
 636 jclass
 637 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 638 {
 639   switch (*sig)
 640     {
 641     case 'B':
 642       return JvPrimClass (byte);
 643     case 'S':
 644       return JvPrimClass (short);
 645     case 'I':
 646       return JvPrimClass (int);
 647     case 'J':
 648       return JvPrimClass (long);
 649     case 'Z':
 650       return JvPrimClass (boolean);
 651     case 'C':
 652       return JvPrimClass (char);
 653     case 'F':
 654       return JvPrimClass (float);
 655     case 'D':
 656       return JvPrimClass (double);
 657     case 'V':
 658       return JvPrimClass (void);
 659     case 'L':
 660       {
 661         int i;
 662         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 663           ;
 664         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 665         return _Jv_FindClass (name, loader);
 666
 667       }
 668     case '[':
 669       {
 670         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 671         if (! klass)
 672           return NULL;
 673         return _Jv_GetArrayClass (klass, loader);
 674       }
 675     }
 676
 677   return NULL;                  // Placate compiler.
 678 }
 679
 680 \f
 681
 682 JArray<jstring> *
 683 JvConvertArgv (int argc, const char **argv)
 684 {
 685   if (argc < 0)
 686     argc = 0;
 687   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 688   jobject *ptr = elements(ar);
 689   jbyteArray bytes = NULL;
 690   for (int i = 0;  i < argc;  i++)
 691     {
 692       const char *arg = argv[i];
 693       int len = strlen (arg);
 694       if (bytes == NULL || bytes->length < len)
 695         bytes = JvNewByteArray (len);
 696       jbyte *bytePtr = elements (bytes);
 697       // We assume jbyte == char.
 698       memcpy (bytePtr, arg, len);
 699
 700       // Now convert using the default encoding.
 701       *ptr++ = new java::lang::String (bytes, 0, len);
 702     }
 703   return (JArray<jstring>*) ar;
 704 }
 705
 706 // FIXME: These variables are static so that they will be
 707 // automatically scanned by the Boehm collector.  This is needed
 708 // because with qthreads the collector won't scan the initial stack --
 709 // it will only scan the qthreads stacks.
 710
 711 // Command line arguments.
 712 static JArray<jstring> *arg_vec;
 713
 714 // The primary thread.
 715 static java::lang::Thread *main_thread;
 716
 717 char *
 718 _Jv_ThisExecutable (void)
 719 {
 720   return _Jv_execName;
 721 }
 722
 723 void
 724 _Jv_ThisExecutable (const char *name)
 725 {
 726   if (name)
 727     {
 728       _Jv_execName = (char *) _Jv_Malloc (strlen (name) + 1);
 729       strcpy (_Jv_execName, name);
 730     }
 731 }
 732
 733 #ifdef USE_WIN32_SIGNALLING
 734
 735 extern "C" int* win32_get_restart_frame (void *);
 736
 737 LONG CALLBACK
 738 win32_exception_handler (LPEXCEPTION_POINTERS e)
 739 {
 740   int* setjmp_buf;
 741   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 742     setjmp_buf = win32_get_restart_frame (nullp);
 743   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 744     setjmp_buf = win32_get_restart_frame (arithexception);
 745   else
 746     return EXCEPTION_CONTINUE_SEARCH;
 747
 748   e->ContextRecord->Ebp = setjmp_buf[0];
 749   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 750   e->ContextRecord->Eip = setjmp_buf[1];
 751   // FIXME: Is this the stack pointer? Do we need it?
 752   e->ContextRecord->Esp = setjmp_buf[2];
 753
 754   return EXCEPTION_CONTINUE_EXECUTION;
 755 }
 756
 757 #endif
 758
 759 #ifndef DISABLE_GETENV_PROPERTIES
 760
 761 static char *
 762 next_property_key (char *s, size_t *length)
 763 {
 764   size_t l = 0;
 765
 766   JvAssert (s);
 767
 768   // Skip over whitespace
 769   while (isspace (*s))
 770     s++;
 771
 772   // If we've reached the end, return NULL.  Also return NULL if for
 773   // some reason we've come across a malformed property string.
 774   if (*s == 0
 775       || *s == ':'
 776       || *s == '=')
 777     return NULL;
 778
 779   // Determine the length of the property key.
 780   while (s[l] != 0
 781          && ! isspace (s[l])
 782          && s[l] != ':'
 783          && s[l] != '=')
 784     {
 785       if (s[l] == '\\'
 786           && s[l+1] != 0)
 787         l++;
 788       l++;
 789     }
 790
 791   *length = l;
 792
 793   return s;
 794 }
 795
 796 static char *
 797 next_property_value (char *s, size_t *length)
 798 {
 799   size_t l = 0;
 800
 801   JvAssert (s);
 802
 803   while (isspace (*s))
 804     s++;
 805
 806   if (*s == ':'
 807       || *s == '=')
 808     s++;
 809
 810   while (isspace (*s))
 811     s++;
 812
 813   // If we've reached the end, return NULL.
 814   if (*s == 0)
 815     return NULL;
 816
 817   // Determine the length of the property value.
 818   while (s[l] != 0
 819          && ! isspace (s[l])
 820          && s[l] != ':'
 821          && s[l] != '=')
 822     {
 823       if (s[l] == '\\'
 824           && s[l+1] != 0)
 825         l += 2;
 826       else
 827         l++;
 828     }
 829
 830   *length = l;
 831
 832   return s;
 833 }
 834
 835 static void
 836 process_gcj_properties ()
 837 {
 838   char *props = getenv("GCJ_PROPERTIES");
 839   char *p = props;
 840   size_t length;
 841   size_t property_count = 0;
 842
 843   if (NULL == props)
 844     return;
 845
 846   // Whip through props quickly in order to count the number of
 847   // property values.
 848   while (p && (p = next_property_key (p, &length)))
 849     {
 850       // Skip to the end of the key
 851       p += length;
 852
 853       p = next_property_value (p, &length);
 854       if (p)
 855         p += length;
 856
 857       property_count++;
 858     }
 859
 860   // Allocate an array of property value/key pairs.
 861   _Jv_Environment_Properties =
 862     (property_pair *) malloc (sizeof(property_pair)
 863                               * (property_count + 1));
 864
 865   // Go through the properties again, initializing _Jv_Properties
 866   // along the way.
 867   p = props;
 868   property_count = 0;
 869   while (p && (p = next_property_key (p, &length)))
 870     {
 871       _Jv_Environment_Properties[property_count].key = p;
 872       _Jv_Environment_Properties[property_count].key_length = length;
 873
 874       // Skip to the end of the key
 875       p += length;
 876
 877       p = next_property_value (p, &length);
 878
 879       _Jv_Environment_Properties[property_count].value = p;
 880       _Jv_Environment_Properties[property_count].value_length = length;
 881
 882       if (p)
 883         p += length;
 884
 885       property_count++;
 886     }
 887   memset ((void *) &_Jv_Environment_Properties[property_count],
 888           0, sizeof (property_pair));
 889   {
 890     size_t i = 0;
 891
 892     // Null terminate the strings.
 893     while (_Jv_Environment_Properties[i].key)
 894       {
 895         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 896         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 897       }
 898   }
 899 }
 900 #endif // DISABLE_GETENV_PROPERTIES
 901
 902 namespace gcj
 903 {
 904   _Jv_Utf8Const *void_signature;
 905   _Jv_Utf8Const *clinit_name;
 906   _Jv_Utf8Const *init_name;
 907   _Jv_Utf8Const *finit_name;
 908
 909   bool runtimeInitialized = false;
 910 }
 911
 912 jint
 913 _Jv_CreateJavaVM (void* /*vm_args*/)
 914 {
 915   using namespace gcj;
 916
 917   if (runtimeInitialized)
 918     return -1;
 919
 920   runtimeInitialized = true;
 921
 922   PROCESS_GCJ_PROPERTIES;
 923
 924   _Jv_InitThreads ();
 925   _Jv_InitGC ();
 926   _Jv_InitializeSyncMutex ();
 927
 928   /* Initialize Utf8 constants declared in jvm.h. */
 929   void_signature = _Jv_makeUtf8Const ("()V", 3);
 930   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 931   init_name = _Jv_makeUtf8Const ("<init>", 6);
 932   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 933
 934   /* Initialize built-in classes to represent primitive TYPEs. */
 935   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1, &_Jv_byteVTable);
 936   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2, &_Jv_shortVTable);
 937   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4, &_Jv_intVTable);
 938   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8, &_Jv_longVTable);
 939   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1, &_Jv_booleanVTable);
 940   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2, &_Jv_charVTable);
 941   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4, &_Jv_floatVTable);
 942   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8, &_Jv_doubleVTable);
 943   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0, &_Jv_voidVTable);
 944
 945   // Turn stack trace generation off while creating exception objects.
 946   _Jv_InitClass (&java::lang::Throwable::class$);
 947   java::lang::Throwable::trace_enabled = 0;
 948
 949   INIT_SEGV;
 950 #ifdef HANDLE_FPE
 951   INIT_FPE;
 952 #else
 953   arithexception = new java::lang::ArithmeticException
 954     (JvNewStringLatin1 ("/ by zero"));
 955 #endif
 956
 957   no_memory = new java::lang::OutOfMemoryError;
 958
 959   java::lang::Throwable::trace_enabled = 1;
 960
 961 #ifdef USE_LTDL
 962   LTDL_SET_PRELOADED_SYMBOLS ();
 963 #endif
 964
 965 #ifdef USE_WINSOCK
 966   // Initialise winsock for networking
 967   WSADATA data;
 968   if (WSAStartup (MAKEWORD (1, 1), &data))
 969       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 970 #endif /* USE_WINSOCK */
 971
 972 #ifdef USE_WIN32_SIGNALLING
 973   // Install exception handler
 974   SetUnhandledExceptionFilter (win32_exception_handler);
 975 #elif defined(HAVE_SIGACTION)
 976   // We only want this on POSIX systems.
 977   struct sigaction act;
 978   act.sa_handler = SIG_IGN;
 979   sigemptyset (&act.sa_mask);
 980   act.sa_flags = 0;
 981   sigaction (SIGPIPE, &act, NULL);
 982 #else
 983   signal (SIGPIPE, SIG_IGN);
 984 #endif
 985
 986   _Jv_JNI_Init ();
 987
 988   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
 989
 990   // Start the GC finalizer thread.  A VirtualMachineError can be
 991   // thrown by the runtime if, say, threads aren't available.  In this
 992   // case finalizers simply won't run.
 993   try
 994     {
 995       using namespace gnu::gcj::runtime;
 996       FinalizerThread *ft = new FinalizerThread ();
 997       ft->start ();
 998     }
 999   catch (java::lang::VirtualMachineError *ignore)
1000     {
1001     }
1002
1003   return 0;
1004 }
1005
1006 void
1007 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
1008              bool is_jar)
1009 {
1010   _Jv_argv = argv;
1011   _Jv_argc = argc;
1012
1013   java::lang::Runtime *runtime = NULL;
1014
1015 #ifdef HAVE_PROC_SELF_EXE
1016   char exec_name[20];
1017   sprintf (exec_name, "/proc/%d/exe", getpid ());
1018   _Jv_ThisExecutable (exec_name);
1019 #else
1020   _Jv_ThisExecutable (argv[0]);
1021 #endif
1022
1023   try
1024     {
1025       // Set this very early so that it is seen when java.lang.System
1026       // is initialized.
1027       if (is_jar)
1028         _Jv_Jar_Class_Path = strdup (name);
1029       _Jv_CreateJavaVM (NULL);
1030
1031       // Get the Runtime here.  We want to initialize it before searching
1032       // for `main'; that way it will be set up if `main' is a JNI method.
1033       runtime = java::lang::Runtime::getRuntime ();
1034
1035       arg_vec = JvConvertArgv (argc - 1, argv + 1);
1036
1037       using namespace gnu::gcj::runtime;
1038       if (klass)
1039         main_thread = new FirstThread (klass, arg_vec);
1040       else
1041         main_thread = new FirstThread (JvNewStringLatin1 (name),
1042                                        arg_vec, is_jar);
1043     }
1044   catch (java::lang::Throwable *t)
1045     {
1046       java::lang::System::err->println (JvNewStringLatin1
1047         ("Exception during runtime initialization"));
1048       t->printStackTrace();
1049       runtime->exit (1);
1050     }
1051
1052   _Jv_AttachCurrentThread (main_thread);
1053   _Jv_ThreadRun (main_thread);
1054   _Jv_ThreadWait ();
1055
1056   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1057   runtime->exit (status);
1058 }
1059
1060 void
1061 JvRunMain (jclass klass, int argc, const char **argv)
1062 {
1063   _Jv_RunMain (klass, NULL, argc, argv, false);
1064 }
1065
1066 \f
1067
1068 // Parse a string and return a heap size.
1069 static size_t
1070 parse_heap_size (const char *spec)
1071 {
1072   char *end;
1073   unsigned long val = strtoul (spec, &end, 10);
1074   if (*end == 'k' || *end == 'K')
1075     val *= 1024;
1076   else if (*end == 'm' || *end == 'M')
1077     val *= 1048576;
1078   return (size_t) val;
1079 }
1080
1081 // Set the initial heap size.  This might be ignored by the GC layer.
1082 // This must be called before _Jv_RunMain.
1083 void
1084 _Jv_SetInitialHeapSize (const char *arg)
1085 {
1086   size_t size = parse_heap_size (arg);
1087   _Jv_GCSetInitialHeapSize (size);
1088 }
1089
1090 // Set the maximum heap size.  This might be ignored by the GC layer.
1091 // This must be called before _Jv_RunMain.
1092 void
1093 _Jv_SetMaximumHeapSize (const char *arg)
1094 {
1095   size_t size = parse_heap_size (arg);
1096   _Jv_GCSetMaximumHeapSize (size);
1097 }
1098
1099 \f
1100
1101 void *
1102 _Jv_Malloc (jsize size)
1103 {
1104   if (__builtin_expect (size == 0, false))
1105     size = 1;
1106   void *ptr = malloc ((size_t) size);
1107   if (__builtin_expect (ptr == NULL, false))
1108     throw no_memory;
1109   return ptr;
1110 }
1111
1112 void *
1113 _Jv_Realloc (void *ptr, jsize size)
1114 {
1115   if (__builtin_expect (size == 0, false))
1116     size = 1;
1117   ptr = realloc (ptr, (size_t) size);
1118   if (__builtin_expect (ptr == NULL, false))
1119     throw no_memory;
1120   return ptr;
1121 }
1122
1123 void *
1124 _Jv_MallocUnchecked (jsize size)
1125 {
1126   if (__builtin_expect (size == 0, false))
1127     size = 1;
1128   return malloc ((size_t) size);
1129 }
1130
1131 void
1132 _Jv_Free (void* ptr)
1133 {
1134   return free (ptr);
1135 }
1136
1137 \f
1138
1139 // In theory, these routines can be #ifdef'd away on machines which
1140 // support divide overflow signals.  However, we never know if some
1141 // code might have been compiled with "-fuse-divide-subroutine", so we
1142 // always include them in libgcj.
1143
1144 jint
1145 _Jv_divI (jint dividend, jint divisor)
1146 {
1147   if (__builtin_expect (divisor == 0, false))
1148     _Jv_ThrowSignal (arithexception);
1149
1150   if (dividend == (jint) 0x80000000L && divisor == -1)
1151     return dividend;
1152
1153   return dividend / divisor;
1154 }
1155
1156 jint
1157 _Jv_remI (jint dividend, jint divisor)
1158 {
1159   if (__builtin_expect (divisor == 0, false))
1160     _Jv_ThrowSignal (arithexception);
1161
1162   if (dividend == (jint) 0x80000000L && divisor == -1)
1163     return 0;
1164
1165   return dividend % divisor;
1166 }
1167
1168 jlong
1169 _Jv_divJ (jlong dividend, jlong divisor)
1170 {
1171   if (__builtin_expect (divisor == 0, false))
1172     _Jv_ThrowSignal (arithexception);
1173
1174   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1175     return dividend;
1176
1177   return dividend / divisor;
1178 }
1179
1180 jlong
1181 _Jv_remJ (jlong dividend, jlong divisor)
1182 {
1183   if (__builtin_expect (divisor == 0, false))
1184     _Jv_ThrowSignal (arithexception);
1185
1186   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1187     return 0;
1188
1189   return dividend % divisor;
1190 }