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