libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002  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 #include <platform.h>
  13
  14 #include <stdlib.h>
  15 #include <stdarg.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <signal.h>
  19
  20 #ifdef HAVE_UNISTD_H
  21 #include <unistd.h>
  22 #endif
  23
  24 #include <gcj/cni.h>
  25 #include <jvm.h>
  26 #include <java-signal.h>
  27 #include <java-threads.h>
  28
  29 #ifdef ENABLE_JVMPI
  30 #include <jvmpi.h>
  31 #include <java/lang/ThreadGroup.h>
  32 #endif
  33
  34 #ifndef DISABLE_GETENV_PROPERTIES
  35 #include <ctype.h>
  36 #include <java-props.h>
  37 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  38 #else
  39 #define PROCESS_GCJ_PROPERTIES
  40 #endif // DISABLE_GETENV_PROPERTIES
  41
  42 #include <java/lang/Class.h>
  43 #include <java/lang/ClassLoader.h>
  44 #include <java/lang/Runtime.h>
  45 #include <java/lang/String.h>
  46 #include <java/lang/Thread.h>
  47 #include <java/lang/ThreadGroup.h>
  48 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  49 #include <java/lang/ArithmeticException.h>
  50 #include <java/lang/ClassFormatError.h>
  51 #include <java/lang/InternalError.h>
  52 #include <java/lang/NegativeArraySizeException.h>
  53 #include <java/lang/NullPointerException.h>
  54 #include <java/lang/OutOfMemoryError.h>
  55 #include <java/lang/System.h>
  56 #include <java/lang/VMThrowable.h>
  57 #include <java/lang/reflect/Modifier.h>
  58 #include <java/io/PrintStream.h>
  59 #include <java/lang/UnsatisfiedLinkError.h>
  60 #include <java/lang/VirtualMachineError.h>
  61 #include <gnu/gcj/runtime/VMClassLoader.h>
  62 #include <gnu/gcj/runtime/FinalizerThread.h>
  63 #include <gnu/gcj/runtime/FirstThread.h>
  64
  65 #ifdef USE_LTDL
  66 #include <ltdl.h>
  67 #endif
  68
  69 // We allocate a single OutOfMemoryError exception which we keep
  70 // around for use if we run out of memory.
  71 static java::lang::OutOfMemoryError *no_memory;
  72
  73 // Largest representable size_t.
  74 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  75
  76 static const char *no_properties[] = { NULL };
  77
  78 // Properties set at compile time.
  79 const char **_Jv_Compiler_Properties = no_properties;
  80
  81 // The JAR file to add to the beginning of java.class.path.
  82 const char *_Jv_Jar_Class_Path;
  83
  84 #ifndef DISABLE_GETENV_PROPERTIES
  85 // Property key/value pairs.
  86 property_pair *_Jv_Environment_Properties;
  87 #endif
  88
  89 // Stash the argv pointer to benefit native libraries that need it.
  90 const char **_Jv_argv;
  91 int _Jv_argc;
  92
  93 #ifdef ENABLE_JVMPI
  94 // Pointer to JVMPI notification functions.
  95 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
  96 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
  97 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
  98 #endif
  99 \f
 100
 101 extern "C" void _Jv_ThrowSignal (jthrowable) __attribute ((noreturn));
 102
 103 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 104 // this is declared extern in order that its name not be mangled, it
 105 // is not intended to be used outside this file.
 106 void
 107 _Jv_ThrowSignal (jthrowable throwable)
 108 {
 109   throwable->fillInStackTrace ();
 110   throw throwable;
 111 }
 112
 113 #ifdef HANDLE_SEGV
 114 static java::lang::NullPointerException *nullp;
 115
 116 SIGNAL_HANDLER (catch_segv)
 117 {
 118   MAKE_THROW_FRAME (nullp);
 119   _Jv_ThrowSignal (nullp);
 120 }
 121 #endif
 122
 123 static java::lang::ArithmeticException *arithexception;
 124
 125 #ifdef HANDLE_FPE
 126 SIGNAL_HANDLER (catch_fpe)
 127 {
 128 #ifdef HANDLE_DIVIDE_OVERFLOW
 129   HANDLE_DIVIDE_OVERFLOW;
 130 #else
 131   MAKE_THROW_FRAME (arithexception);
 132 #endif
 133   _Jv_ThrowSignal (arithexception);
 134 }
 135 #endif
 136
 137 \f
 138
 139 jboolean
 140 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 141 {
 142   int len;
 143   _Jv_ushort *aptr, *bptr;
 144   if (a == b)
 145     return true;
 146   if (a->hash != b->hash)
 147     return false;
 148   len = a->length;
 149   if (b->length != len)
 150     return false;
 151   aptr = (_Jv_ushort *)a->data;
 152   bptr = (_Jv_ushort *)b->data;
 153   len = (len + 1) >> 1;
 154   while (--len >= 0)
 155     if (*aptr++ != *bptr++)
 156       return false;
 157   return true;
 158 }
 159
 160 /* True iff A is equal to STR.
 161    HASH is STR->hashCode().
 162 */
 163
 164 jboolean
 165 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 166 {
 167   if (a->hash != (_Jv_ushort) hash)
 168     return false;
 169   jint len = str->length();
 170   jint i = 0;
 171   jchar *sptr = _Jv_GetStringChars (str);
 172   unsigned char* ptr = (unsigned char*) a->data;
 173   unsigned char* limit = ptr + a->length;
 174   for (;; i++, sptr++)
 175     {
 176       int ch = UTF8_GET (ptr, limit);
 177       if (i == len)
 178         return ch < 0;
 179       if (ch != *sptr)
 180         return false;
 181     }
 182   return true;
 183 }
 184
 185 /* Like _Jv_equal, but stop after N characters.  */
 186 jboolean
 187 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 188 {
 189   jint len = str->length();
 190   jint i = 0;
 191   jchar *sptr = _Jv_GetStringChars (str);
 192   unsigned char* ptr = (unsigned char*) a->data;
 193   unsigned char* limit = ptr + a->length;
 194   for (; n-- > 0; i++, sptr++)
 195     {
 196       int ch = UTF8_GET (ptr, limit);
 197       if (i == len)
 198         return ch < 0;
 199       if (ch != *sptr)
 200         return false;
 201     }
 202   return true;
 203 }
 204
 205 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 206 int
 207 _Jv_strLengthUtf8(char* str, int len)
 208 {
 209   unsigned char* ptr;
 210   unsigned char* limit;
 211   int str_length;
 212
 213   ptr = (unsigned char*) str;
 214   limit = ptr + len;
 215   str_length = 0;
 216   for (; ptr < limit; str_length++)
 217     {
 218       if (UTF8_GET (ptr, limit) < 0)
 219         return (-1);
 220     }
 221   return (str_length);
 222 }
 223
 224 /* Calculate a hash value for a string encoded in Utf8 format.
 225  * This returns the same hash value as specified or java.lang.String.hashCode.
 226  */
 227 static jint
 228 hashUtf8String (char* str, int len)
 229 {
 230   unsigned char* ptr = (unsigned char*) str;
 231   unsigned char* limit = ptr + len;
 232   jint hash = 0;
 233
 234   for (; ptr < limit;)
 235     {
 236       int ch = UTF8_GET (ptr, limit);
 237       /* Updated specification from
 238          http://www.javasoft.com/docs/books/jls/clarify.html. */
 239       hash = (31 * hash) + ch;
 240     }
 241   return hash;
 242 }
 243
 244 _Jv_Utf8Const *
 245 _Jv_makeUtf8Const (char* s, int len)
 246 {
 247   if (len < 0)
 248     len = strlen (s);
 249   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 250   memcpy (m->data, s, len);
 251   m->data[len] = 0;
 252   m->length = len;
 253   m->hash = hashUtf8String (s, len) & 0xFFFF;
 254   return (m);
 255 }
 256
 257 _Jv_Utf8Const *
 258 _Jv_makeUtf8Const (jstring string)
 259 {
 260   jint hash = string->hashCode ();
 261   jint len = _Jv_GetStringUTFLength (string);
 262
 263   Utf8Const* m = (Utf8Const*)
 264     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 265
 266   m->hash = hash;
 267   m->length = len;
 268
 269   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 270   m->data[len] = 0;
 271
 272   return m;
 273 }
 274
 275 \f
 276
 277 #ifdef DEBUG
 278 void
 279 _Jv_Abort (const char *function, const char *file, int line,
 280            const char *message)
 281 #else
 282 void
 283 _Jv_Abort (const char *, const char *, int, const char *message)
 284 #endif
 285 {
 286 #ifdef DEBUG
 287   fprintf (stderr,
 288            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 289            message, function, file, line);
 290 #else
 291   fprintf (stderr, "libgcj failure: %s\n", message);
 292 #endif
 293   abort ();
 294 }
 295
 296 static void
 297 fail_on_finalization (jobject)
 298 {
 299   JvFail ("object was finalized");
 300 }
 301
 302 void
 303 _Jv_GCWatch (jobject obj)
 304 {
 305   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 306 }
 307
 308 void
 309 _Jv_ThrowBadArrayIndex(jint bad_index)
 310 {
 311   throw new java::lang::ArrayIndexOutOfBoundsException
 312     (java::lang::String::valueOf (bad_index));
 313 }
 314
 315 void
 316 _Jv_ThrowNullPointerException ()
 317 {
 318   throw new java::lang::NullPointerException;
 319 }
 320
 321 // Explicitly throw a no memory exception.
 322 // The collector calls this when it encounters an out-of-memory condition.
 323 void _Jv_ThrowNoMemory()
 324 {
 325   throw no_memory;
 326 }
 327
 328 #ifdef ENABLE_JVMPI
 329 static void
 330 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 331 {
 332   // Service JVMPI allocation request.
 333   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 334     {
 335       JVMPI_Event event;
 336
 337       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 338       event.env_id = NULL;
 339       event.u.obj_alloc.arena_id = 0;
 340       event.u.obj_alloc.class_id = (jobjectID) klass;
 341       event.u.obj_alloc.is_array = 0;
 342       event.u.obj_alloc.size = size;
 343       event.u.obj_alloc.obj_id = (jobjectID) obj;
 344
 345       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 346       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 347       // More importantly, I don't see the need for disabling GC, since we
 348       // blatantly have a pointer to obj on our stack, ensuring that the
 349       // object can't be collected.  Even for a nonconservative collector,
 350       // it appears to me that this must be true, since we are about to
 351       // return obj. Isn't this whole approach way too intrusive for
 352       // a useful profiling interface?                  - HB
 353       _Jv_DisableGC ();
 354       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 355       _Jv_EnableGC ();
 356     }
 357 }
 358 #else /* !ENABLE_JVMPI */
 359 # define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 360 #endif
 361
 362 // Allocate a new object of class KLASS.  SIZE is the size of the object
 363 // to allocate.  You might think this is redundant, but it isn't; some
 364 // classes, such as String, aren't of fixed size.
 365 // First a version that assumes that we have no finalizer, and that
 366 // the class is already initialized.
 367 // If we know that JVMPI is disabled, this can be replaced by a direct call
 368 // to the allocator for the appropriate GC.
 369 jobject
 370 _Jv_AllocObjectNoInitNoFinalizer (jclass klass, jint size)
 371 {
 372   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 373   jvmpi_notify_alloc (klass, size, obj);
 374   return obj;
 375 }
 376
 377 // And now a version that initializes if necessary.
 378 jobject
 379 _Jv_AllocObjectNoFinalizer (jclass klass, jint size)
 380 {
 381   _Jv_InitClass (klass);
 382   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 383   jvmpi_notify_alloc (klass, size, obj);
 384   return obj;
 385 }
 386
 387 // And now the general version that registers a finalizer if necessary.
 388 jobject
 389 _Jv_AllocObject (jclass klass, jint size)
 390 {
 391   jobject obj = _Jv_AllocObjectNoFinalizer (klass, size);
 392
 393   // We assume that the compiler only generates calls to this routine
 394   // if there really is an interesting finalizer.
 395   // Unfortunately, we still have to the dynamic test, since there may
 396   // be cni calls to this routine.
 397   // Note that on IA64 get_finalizer() returns the starting address of the
 398   // function, not a function pointer.  Thus this still works.
 399   if (klass->vtable->get_finalizer ()
 400       != java::lang::Object::class$.vtable->get_finalizer ())
 401     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 402   return obj;
 403 }
 404
 405 // A version of the above that assumes the object contains no pointers,
 406 // and requires no finalization.  This can't happen if we need pointers
 407 // to locks.
 408 #ifdef JV_HASH_SYNCHRONIZATION
 409 jobject
 410 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 411 {
 412   _Jv_InitClass (klass);
 413
 414   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 415
 416 #ifdef ENABLE_JVMPI
 417   // Service JVMPI request.
 418
 419   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 420     {
 421       JVMPI_Event event;
 422
 423       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 424       event.env_id = NULL;
 425       event.u.obj_alloc.arena_id = 0;
 426       event.u.obj_alloc.class_id = (jobjectID) klass;
 427       event.u.obj_alloc.is_array = 0;
 428       event.u.obj_alloc.size = size;
 429       event.u.obj_alloc.obj_id = (jobjectID) obj;
 430
 431       _Jv_DisableGC ();
 432       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 433       _Jv_EnableGC ();
 434     }
 435 #endif
 436
 437   return obj;
 438 }
 439 #endif /* JV_HASH_SYNCHRONIZATION */
 440
 441
 442 // Allocate a new array of Java objects.  Each object is of type
 443 // `elementClass'.  `init' is used to initialize each slot in the
 444 // array.
 445 jobjectArray
 446 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 447 {
 448   if (__builtin_expect (count < 0, false))
 449     throw new java::lang::NegativeArraySizeException;
 450
 451   JvAssert (! elementClass->isPrimitive ());
 452
 453   // Ensure that elements pointer is properly aligned.
 454   jobjectArray obj = NULL;
 455   size_t size = (size_t) elements (obj);
 456   size += count * sizeof (jobject);
 457
 458   jclass klass = _Jv_GetArrayClass (elementClass,
 459                                     elementClass->getClassLoaderInternal());
 460
 461   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 462   // Cast away const.
 463   jsize *lp = const_cast<jsize *> (&obj->length);
 464   *lp = count;
 465   // We know the allocator returns zeroed memory.  So don't bother
 466   // zeroing it again.
 467   if (init)
 468     {
 469       jobject *ptr = elements(obj);
 470       while (--count >= 0)
 471         *ptr++ = init;
 472     }
 473   return obj;
 474 }
 475
 476 // Allocate a new array of primitives.  ELTYPE is the type of the
 477 // element, COUNT is the size of the array.
 478 jobject
 479 _Jv_NewPrimArray (jclass eltype, jint count)
 480 {
 481   int elsize = eltype->size();
 482   if (__builtin_expect (count < 0, false))
 483     throw new java::lang::NegativeArraySizeException;
 484
 485   JvAssert (eltype->isPrimitive ());
 486   jobject dummy = NULL;
 487   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 488
 489   // Check for overflow.
 490   if (__builtin_expect ((size_t) count >
 491                         (SIZE_T_MAX - size) / elsize, false))
 492     throw no_memory;
 493
 494   jclass klass = _Jv_GetArrayClass (eltype, 0);
 495
 496 # ifdef JV_HASH_SYNCHRONIZATION
 497   // Since the vtable is always statically allocated,
 498   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 499   __JArray *arr =
 500     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 501   memset((char *)arr + size, 0, elsize * count);
 502 # else
 503   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 504   // Note that we assume we are given zeroed memory by the allocator.
 505 # endif
 506   // Cast away const.
 507   jsize *lp = const_cast<jsize *> (&arr->length);
 508   *lp = count;
 509
 510   return arr;
 511 }
 512
 513 jobject
 514 _Jv_NewArray (jint type, jint size)
 515 {
 516   switch (type)
 517     {
 518       case  4:  return JvNewBooleanArray (size);
 519       case  5:  return JvNewCharArray (size);
 520       case  6:  return JvNewFloatArray (size);
 521       case  7:  return JvNewDoubleArray (size);
 522       case  8:  return JvNewByteArray (size);
 523       case  9:  return JvNewShortArray (size);
 524       case 10:  return JvNewIntArray (size);
 525       case 11:  return JvNewLongArray (size);
 526     }
 527   throw new java::lang::InternalError
 528     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 529 }
 530
 531 // Allocate a possibly multi-dimensional array but don't check that
 532 // any array length is <0.
 533 static jobject
 534 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 535 {
 536   JvAssert (type->isArray());
 537   jclass element_type = type->getComponentType();
 538   jobject result;
 539   if (element_type->isPrimitive())
 540     result = _Jv_NewPrimArray (element_type, sizes[0]);
 541   else
 542     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 543
 544   if (dimensions > 1)
 545     {
 546       JvAssert (! element_type->isPrimitive());
 547       JvAssert (element_type->isArray());
 548       jobject *contents = elements ((jobjectArray) result);
 549       for (int i = 0; i < sizes[0]; ++i)
 550         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 551                                                   sizes + 1);
 552     }
 553
 554   return result;
 555 }
 556
 557 jobject
 558 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 559 {
 560   for (int i = 0; i < dimensions; ++i)
 561     if (sizes[i] < 0)
 562       throw new java::lang::NegativeArraySizeException;
 563
 564   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 565 }
 566
 567 jobject
 568 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 569 {
 570   va_list args;
 571   jint sizes[dimensions];
 572   va_start (args, dimensions);
 573   for (int i = 0; i < dimensions; ++i)
 574     {
 575       jint size = va_arg (args, jint);
 576       if (size < 0)
 577         throw new java::lang::NegativeArraySizeException;
 578       sizes[i] = size;
 579     }
 580   va_end (args);
 581
 582   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 583 }
 584
 585 \f
 586
 587 // Ensure 8-byte alignment, for hash synchronization.
 588 #define DECLARE_PRIM_TYPE(NAME)                 \
 589   _Jv_ArrayVTable _Jv_##NAME##VTable;           \
 590   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 591
 592 DECLARE_PRIM_TYPE(byte)
 593 DECLARE_PRIM_TYPE(short)
 594 DECLARE_PRIM_TYPE(int)
 595 DECLARE_PRIM_TYPE(long)
 596 DECLARE_PRIM_TYPE(boolean)
 597 DECLARE_PRIM_TYPE(char)
 598 DECLARE_PRIM_TYPE(float)
 599 DECLARE_PRIM_TYPE(double)
 600 DECLARE_PRIM_TYPE(void)
 601
 602 void
 603 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len,
 604                    _Jv_ArrayVTable *array_vtable)
 605 {
 606   using namespace java::lang::reflect;
 607
 608   _Jv_InitNewClassFields (cl);
 609
 610   // We must set the vtable for the class; the Java constructor
 611   // doesn't do this.
 612   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 613
 614   // Initialize the fields we care about.  We do this in the same
 615   // order they are declared in Class.h.
 616   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 617   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 618   cl->method_count = sig;
 619   cl->size_in_bytes = len;
 620   cl->vtable = JV_PRIMITIVE_VTABLE;
 621   cl->state = JV_STATE_DONE;
 622   cl->depth = -1;
 623   if (sig != 'V')
 624     _Jv_NewArrayClass (cl, NULL, (_Jv_VTable *) array_vtable);
 625 }
 626
 627 jclass
 628 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 629 {
 630   switch (*sig)
 631     {
 632     case 'B':
 633       return JvPrimClass (byte);
 634     case 'S':
 635       return JvPrimClass (short);
 636     case 'I':
 637       return JvPrimClass (int);
 638     case 'J':
 639       return JvPrimClass (long);
 640     case 'Z':
 641       return JvPrimClass (boolean);
 642     case 'C':
 643       return JvPrimClass (char);
 644     case 'F':
 645       return JvPrimClass (float);
 646     case 'D':
 647       return JvPrimClass (double);
 648     case 'V':
 649       return JvPrimClass (void);
 650     case 'L':
 651       {
 652         int i;
 653         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 654           ;
 655         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 656         return _Jv_FindClass (name, loader);
 657       }
 658     case '[':
 659       {
 660         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 661         if (! klass)
 662           return NULL;
 663         return _Jv_GetArrayClass (klass, loader);
 664       }
 665     }
 666
 667   return NULL;                  // Placate compiler.
 668 }
 669
 670 \f
 671
 672 JArray<jstring> *
 673 JvConvertArgv (int argc, const char **argv)
 674 {
 675   if (argc < 0)
 676     argc = 0;
 677   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 678   jobject *ptr = elements(ar);
 679   jbyteArray bytes = NULL;
 680   for (int i = 0;  i < argc;  i++)
 681     {
 682       const char *arg = argv[i];
 683       int len = strlen (arg);
 684       if (bytes == NULL || bytes->length < len)
 685         bytes = JvNewByteArray (len);
 686       jbyte *bytePtr = elements (bytes);
 687       // We assume jbyte == char.
 688       memcpy (bytePtr, arg, len);
 689
 690       // Now convert using the default encoding.
 691       *ptr++ = new java::lang::String (bytes, 0, len);
 692     }
 693   return (JArray<jstring>*) ar;
 694 }
 695
 696 // FIXME: These variables are static so that they will be
 697 // automatically scanned by the Boehm collector.  This is needed
 698 // because with qthreads the collector won't scan the initial stack --
 699 // it will only scan the qthreads stacks.
 700
 701 // Command line arguments.
 702 static JArray<jstring> *arg_vec;
 703
 704 // The primary thread.
 705 static java::lang::Thread *main_thread;
 706
 707 #ifndef DISABLE_GETENV_PROPERTIES
 708
 709 static char *
 710 next_property_key (char *s, size_t *length)
 711 {
 712   size_t l = 0;
 713
 714   JvAssert (s);
 715
 716   // Skip over whitespace
 717   while (isspace (*s))
 718     s++;
 719
 720   // If we've reached the end, return NULL.  Also return NULL if for
 721   // some reason we've come across a malformed property string.
 722   if (*s == 0
 723       || *s == ':'
 724       || *s == '=')
 725     return NULL;
 726
 727   // Determine the length of the property key.
 728   while (s[l] != 0
 729          && ! isspace (s[l])
 730          && s[l] != ':'
 731          && s[l] != '=')
 732     {
 733       if (s[l] == '\\'
 734           && s[l+1] != 0)
 735         l++;
 736       l++;
 737     }
 738
 739   *length = l;
 740
 741   return s;
 742 }
 743
 744 static char *
 745 next_property_value (char *s, size_t *length)
 746 {
 747   size_t l = 0;
 748
 749   JvAssert (s);
 750
 751   while (isspace (*s))
 752     s++;
 753
 754   if (*s == ':'
 755       || *s == '=')
 756     s++;
 757
 758   while (isspace (*s))
 759     s++;
 760
 761   // If we've reached the end, return NULL.
 762   if (*s == 0)
 763     return NULL;
 764
 765   // Determine the length of the property value.
 766   while (s[l] != 0
 767          && ! isspace (s[l])
 768          && s[l] != ':'
 769          && s[l] != '=')
 770     {
 771       if (s[l] == '\\'
 772           && s[l+1] != 0)
 773         l += 2;
 774       else
 775         l++;
 776     }
 777
 778   *length = l;
 779
 780   return s;
 781 }
 782
 783 static void
 784 process_gcj_properties ()
 785 {
 786   char *props = getenv("GCJ_PROPERTIES");
 787   char *p = props;
 788   size_t length;
 789   size_t property_count = 0;
 790
 791   if (NULL == props)
 792     return;
 793
 794   // Whip through props quickly in order to count the number of
 795   // property values.
 796   while (p && (p = next_property_key (p, &length)))
 797     {
 798       // Skip to the end of the key
 799       p += length;
 800
 801       p = next_property_value (p, &length);
 802       if (p)
 803         p += length;
 804
 805       property_count++;
 806     }
 807
 808   // Allocate an array of property value/key pairs.
 809   _Jv_Environment_Properties =
 810     (property_pair *) malloc (sizeof(property_pair)
 811                               * (property_count + 1));
 812
 813   // Go through the properties again, initializing _Jv_Properties
 814   // along the way.
 815   p = props;
 816   property_count = 0;
 817   while (p && (p = next_property_key (p, &length)))
 818     {
 819       _Jv_Environment_Properties[property_count].key = p;
 820       _Jv_Environment_Properties[property_count].key_length = length;
 821
 822       // Skip to the end of the key
 823       p += length;
 824
 825       p = next_property_value (p, &length);
 826
 827       _Jv_Environment_Properties[property_count].value = p;
 828       _Jv_Environment_Properties[property_count].value_length = length;
 829
 830       if (p)
 831         p += length;
 832
 833       property_count++;
 834     }
 835   memset ((void *) &_Jv_Environment_Properties[property_count],
 836           0, sizeof (property_pair));
 837   {
 838     size_t i = 0;
 839
 840     // Null terminate the strings.
 841     while (_Jv_Environment_Properties[i].key)
 842       {
 843         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 844         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 845       }
 846   }
 847 }
 848 #endif // DISABLE_GETENV_PROPERTIES
 849
 850 namespace gcj
 851 {
 852   _Jv_Utf8Const *void_signature;
 853   _Jv_Utf8Const *clinit_name;
 854   _Jv_Utf8Const *init_name;
 855   _Jv_Utf8Const *finit_name;
 856
 857   bool runtimeInitialized = false;
 858 }
 859
 860 jint
 861 _Jv_CreateJavaVM (void* /*vm_args*/)
 862 {
 863   using namespace gcj;
 864
 865   if (runtimeInitialized)
 866     return -1;
 867
 868   runtimeInitialized = true;
 869
 870   PROCESS_GCJ_PROPERTIES;
 871
 872   _Jv_InitThreads ();
 873   _Jv_InitGC ();
 874   _Jv_InitializeSyncMutex ();
 875
 876   /* Initialize Utf8 constants declared in jvm.h. */
 877   void_signature = _Jv_makeUtf8Const ("()V", 3);
 878   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 879   init_name = _Jv_makeUtf8Const ("<init>", 6);
 880   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 881
 882   /* Initialize built-in classes to represent primitive TYPEs. */
 883   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1, &_Jv_byteVTable);
 884   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2, &_Jv_shortVTable);
 885   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4, &_Jv_intVTable);
 886   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8, &_Jv_longVTable);
 887   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1, &_Jv_booleanVTable);
 888   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2, &_Jv_charVTable);
 889   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4, &_Jv_floatVTable);
 890   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8, &_Jv_doubleVTable);
 891   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0, &_Jv_voidVTable);
 892
 893   // Turn stack trace generation off while creating exception objects.
 894   _Jv_InitClass (&java::lang::VMThrowable::class$);
 895   java::lang::VMThrowable::trace_enabled = 0;
 896
 897   INIT_SEGV;
 898 #ifdef HANDLE_FPE
 899   INIT_FPE;
 900 #else
 901   arithexception = new java::lang::ArithmeticException
 902     (JvNewStringLatin1 ("/ by zero"));
 903 #endif
 904
 905   no_memory = new java::lang::OutOfMemoryError;
 906
 907   java::lang::VMThrowable::trace_enabled = 1;
 908
 909 #ifdef USE_LTDL
 910   LTDL_SET_PRELOADED_SYMBOLS ();
 911 #endif
 912
 913   _Jv_platform_initialize ();
 914
 915   _Jv_JNI_Init ();
 916
 917   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
 918
 919   // Start the GC finalizer thread.  A VirtualMachineError can be
 920   // thrown by the runtime if, say, threads aren't available.  In this
 921   // case finalizers simply won't run.
 922   try
 923     {
 924       using namespace gnu::gcj::runtime;
 925       FinalizerThread *ft = new FinalizerThread ();
 926       ft->start ();
 927     }
 928   catch (java::lang::VirtualMachineError *ignore)
 929     {
 930     }
 931
 932   return 0;
 933 }
 934
 935 void
 936 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 937              bool is_jar)
 938 {
 939   _Jv_argv = argv;
 940   _Jv_argc = argc;
 941
 942   java::lang::Runtime *runtime = NULL;
 943
 944   try
 945     {
 946       // Set this very early so that it is seen when java.lang.System
 947       // is initialized.
 948       if (is_jar)
 949         _Jv_Jar_Class_Path = strdup (name);
 950       _Jv_CreateJavaVM (NULL);
 951
 952       // Get the Runtime here.  We want to initialize it before searching
 953       // for `main'; that way it will be set up if `main' is a JNI method.
 954       runtime = java::lang::Runtime::getRuntime ();
 955
 956 #ifdef DISABLE_MAIN_ARGS
 957       arg_vec = JvConvertArgv (0, 0);
 958 #else
 959       arg_vec = JvConvertArgv (argc - 1, argv + 1);
 960 #endif
 961
 962       using namespace gnu::gcj::runtime;
 963       if (klass)
 964         main_thread = new FirstThread (klass, arg_vec);
 965       else
 966         main_thread = new FirstThread (JvNewStringLatin1 (name),
 967                                        arg_vec, is_jar);
 968     }
 969   catch (java::lang::Throwable *t)
 970     {
 971       java::lang::System::err->println (JvNewStringLatin1
 972         ("Exception during runtime initialization"));
 973       t->printStackTrace();
 974       runtime->exit (1);
 975     }
 976
 977   _Jv_AttachCurrentThread (main_thread);
 978   _Jv_ThreadRun (main_thread);
 979   _Jv_ThreadWait ();
 980
 981   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 982   runtime->exit (status);
 983 }
 984
 985 void
 986 JvRunMain (jclass klass, int argc, const char **argv)
 987 {
 988   _Jv_RunMain (klass, NULL, argc, argv, false);
 989 }
 990
 991 \f
 992
 993 // Parse a string and return a heap size.
 994 static size_t
 995 parse_heap_size (const char *spec)
 996 {
 997   char *end;
 998   unsigned long val = strtoul (spec, &end, 10);
 999   if (*end == 'k' || *end == 'K')
1000     val *= 1024;
1001   else if (*end == 'm' || *end == 'M')
1002     val *= 1048576;
1003   return (size_t) val;
1004 }
1005
1006 // Set the initial heap size.  This might be ignored by the GC layer.
1007 // This must be called before _Jv_RunMain.
1008 void
1009 _Jv_SetInitialHeapSize (const char *arg)
1010 {
1011   size_t size = parse_heap_size (arg);
1012   _Jv_GCSetInitialHeapSize (size);
1013 }
1014
1015 // Set the maximum heap size.  This might be ignored by the GC layer.
1016 // This must be called before _Jv_RunMain.
1017 void
1018 _Jv_SetMaximumHeapSize (const char *arg)
1019 {
1020   size_t size = parse_heap_size (arg);
1021   _Jv_GCSetMaximumHeapSize (size);
1022 }
1023
1024 \f
1025
1026 void *
1027 _Jv_Malloc (jsize size)
1028 {
1029   if (__builtin_expect (size == 0, false))
1030     size = 1;
1031   void *ptr = malloc ((size_t) size);
1032   if (__builtin_expect (ptr == NULL, false))
1033     throw no_memory;
1034   return ptr;
1035 }
1036
1037 void *
1038 _Jv_Realloc (void *ptr, jsize size)
1039 {
1040   if (__builtin_expect (size == 0, false))
1041     size = 1;
1042   ptr = realloc (ptr, (size_t) size);
1043   if (__builtin_expect (ptr == NULL, false))
1044     throw no_memory;
1045   return ptr;
1046 }
1047
1048 void *
1049 _Jv_MallocUnchecked (jsize size)
1050 {
1051   if (__builtin_expect (size == 0, false))
1052     size = 1;
1053   return malloc ((size_t) size);
1054 }
1055
1056 void
1057 _Jv_Free (void* ptr)
1058 {
1059   return free (ptr);
1060 }
1061
1062 \f
1063
1064 // In theory, these routines can be #ifdef'd away on machines which
1065 // support divide overflow signals.  However, we never know if some
1066 // code might have been compiled with "-fuse-divide-subroutine", so we
1067 // always include them in libgcj.
1068
1069 jint
1070 _Jv_divI (jint dividend, jint divisor)
1071 {
1072   if (__builtin_expect (divisor == 0, false))
1073     _Jv_ThrowSignal (arithexception);
1074
1075   if (dividend == (jint) 0x80000000L && divisor == -1)
1076     return dividend;
1077
1078   return dividend / divisor;
1079 }
1080
1081 jint
1082 _Jv_remI (jint dividend, jint divisor)
1083 {
1084   if (__builtin_expect (divisor == 0, false))
1085     _Jv_ThrowSignal (arithexception);
1086
1087   if (dividend == (jint) 0x80000000L && divisor == -1)
1088     return 0;
1089
1090   return dividend % divisor;
1091 }
1092
1093 jlong
1094 _Jv_divJ (jlong dividend, jlong divisor)
1095 {
1096   if (__builtin_expect (divisor == 0, false))
1097     _Jv_ThrowSignal (arithexception);
1098
1099   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1100     return dividend;
1101
1102   return dividend / divisor;
1103 }
1104
1105 jlong
1106 _Jv_remJ (jlong dividend, jlong divisor)
1107 {
1108   if (__builtin_expect (divisor == 0, false))
1109     _Jv_ThrowSignal (arithexception);
1110
1111   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1112     return 0;
1113
1114   return dividend % divisor;
1115 }