libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007  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 #include <java-interp.h>
  29
  30 #ifdef ENABLE_JVMPI
  31 #include <jvmpi.h>
  32 #include <java/lang/ThreadGroup.h>
  33 #endif
  34
  35 #ifdef INTERPRETER
  36 #include <jvmti.h>
  37 #include "jvmti-int.h"
  38 #endif
  39
  40 #ifndef DISABLE_GETENV_PROPERTIES
  41 #include <java-props.h>
  42 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  43 #else
  44 #define PROCESS_GCJ_PROPERTIES
  45 #endif // DISABLE_GETENV_PROPERTIES
  46
  47 #include <java/lang/Class.h>
  48 #include <java/lang/ClassLoader.h>
  49 #include <java/lang/Runtime.h>
  50 #include <java/lang/String.h>
  51 #include <java/lang/Thread.h>
  52 #include <java/lang/ThreadGroup.h>
  53 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  54 #include <java/lang/ArithmeticException.h>
  55 #include <java/lang/ClassFormatError.h>
  56 #include <java/lang/ClassNotFoundException.h>
  57 #include <java/lang/InternalError.h>
  58 #include <java/lang/NegativeArraySizeException.h>
  59 #include <java/lang/NoClassDefFoundError.h>
  60 #include <java/lang/NullPointerException.h>
  61 #include <java/lang/OutOfMemoryError.h>
  62 #include <java/lang/System.h>
  63 #include <java/lang/VMClassLoader.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/ExtensionClassLoader.h>
  69 #include <gnu/gcj/runtime/FinalizerThread.h>
  70 #include <execution.h>
  71
  72 #ifdef INTERPRETER
  73 #include <gnu/classpath/jdwp/Jdwp.h>
  74 #include <gnu/classpath/jdwp/VMVirtualMachine.h>
  75 #endif // INTERPRETER
  76
  77 #include <gnu/java/lang/MainThread.h>
  78
  79 #ifdef USE_LTDL
  80 #include <ltdl.h>
  81 #endif
  82
  83 // Execution engine for compiled code.
  84 _Jv_CompiledEngine _Jv_soleCompiledEngine;
  85
  86 // Execution engine for code compiled with -findirect-classes
  87 _Jv_IndirectCompiledEngine _Jv_soleIndirectCompiledEngine;
  88
  89 // We allocate a single OutOfMemoryError exception which we keep
  90 // around for use if we run out of memory.
  91 static java::lang::OutOfMemoryError *no_memory;
  92
  93 // Number of bytes in largest array object we create.  This could be
  94 // increased to the largest size_t value, so long as the appropriate
  95 // functions are changed to take a size_t argument instead of jint.
  96 #define MAX_OBJECT_SIZE (((size_t)1<<31) - 1)
  97
  98 // Properties set at compile time.
  99 const char **_Jv_Compiler_Properties = NULL;
 100 int _Jv_Properties_Count = 0;
 101
 102 #ifndef DISABLE_GETENV_PROPERTIES
 103 // Property key/value pairs.
 104 property_pair *_Jv_Environment_Properties;
 105 #endif
 106
 107 // Stash the argv pointer to benefit native libraries that need it.
 108 const char **_Jv_argv;
 109 int _Jv_argc;
 110
 111 // Debugging options
 112 static bool remoteDebug = false;
 113 #ifdef INTERPRETER
 114 static char defaultJdwpOptions[] = "";
 115 static char *jdwpOptions = defaultJdwpOptions;
 116
 117 // Typedefs for JVMTI agent functions.
 118 typedef jint jvmti_agent_onload_func (JavaVM *vm, char *options,
 119                                       void *reserved);
 120 typedef jint jvmti_agent_onunload_func (JavaVM *vm);
 121
 122 // JVMTI agent function pointers.
 123 static jvmti_agent_onload_func *jvmti_agentonload = NULL;
 124 static jvmti_agent_onunload_func *jvmti_agentonunload = NULL;
 125 static char *jvmti_agent_opts;
 126 #endif // INTERPRETER
 127
 128 // Argument support.
 129 int
 130 _Jv_GetNbArgs (void)
 131 {
 132   // _Jv_argc is 0 if not explicitly initialized.
 133   return _Jv_argc;
 134 }
 135
 136 const char *
 137 _Jv_GetSafeArg (int index)
 138 {
 139   if (index >=0 && index < _Jv_GetNbArgs ())
 140     return _Jv_argv[index];
 141   else
 142     return "";
 143 }
 144
 145 void
 146 _Jv_SetArgs (int argc, const char **argv)
 147 {
 148   _Jv_argc = argc;
 149   _Jv_argv = argv;
 150 }
 151
 152 #ifdef ENABLE_JVMPI
 153 // Pointer to JVMPI notification functions.
 154 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 155 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 156 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 157 #endif
 158 \f
 159
 160 #if defined (HANDLE_SEGV) || defined(HANDLE_FPE)
 161 /* Unblock a signal.  Unless we do this, the signal may only be sent
 162    once.  */
 163 static void
 164 unblock_signal (int signum __attribute__ ((__unused__)))
 165 {
 166 #ifdef _POSIX_VERSION
 167   sigset_t sigs;
 168
 169   sigemptyset (&sigs);
 170   sigaddset (&sigs, signum);
 171   sigprocmask (SIG_UNBLOCK, &sigs, NULL);
 172 #endif
 173 }
 174 #endif
 175
 176 #ifdef HANDLE_SEGV
 177 SIGNAL_HANDLER (catch_segv)
 178 {
 179   unblock_signal (SIGSEGV);
 180   MAKE_THROW_FRAME (nullp);
 181   java::lang::NullPointerException *nullp
 182     = new java::lang::NullPointerException;
 183   throw nullp;
 184 }
 185 #endif
 186
 187 #ifdef HANDLE_FPE
 188 SIGNAL_HANDLER (catch_fpe)
 189 {
 190   unblock_signal (SIGFPE);
 191 #ifdef HANDLE_DIVIDE_OVERFLOW
 192   HANDLE_DIVIDE_OVERFLOW;
 193 #else
 194   MAKE_THROW_FRAME (arithexception);
 195 #endif
 196   java::lang::ArithmeticException *arithexception
 197     = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
 198   throw arithexception;
 199 }
 200 #endif
 201
 202
 203 jboolean
 204 _Jv_equalUtf8Consts (const Utf8Const* a, const Utf8Const *b)
 205 {
 206   int len;
 207   const _Jv_ushort *aptr, *bptr;
 208   if (a == b)
 209     return true;
 210   if (a->hash != b->hash)
 211     return false;
 212   len = a->length;
 213   if (b->length != len)
 214     return false;
 215   aptr = (const _Jv_ushort *)a->data;
 216   bptr = (const _Jv_ushort *)b->data;
 217   len = (len + 1) >> 1;
 218   while (--len >= 0)
 219     if (*aptr++ != *bptr++)
 220       return false;
 221   return true;
 222 }
 223
 224 /* True iff A is equal to STR.
 225    HASH is STR->hashCode().
 226 */
 227
 228 jboolean
 229 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 230 {
 231   if (a->hash != (_Jv_ushort) hash)
 232     return false;
 233   jint len = str->length();
 234   jint i = 0;
 235   jchar *sptr = _Jv_GetStringChars (str);
 236   unsigned char* ptr = (unsigned char*) a->data;
 237   unsigned char* limit = ptr + a->length;
 238   for (;; i++, sptr++)
 239     {
 240       int ch = UTF8_GET (ptr, limit);
 241       if (i == len)
 242         return ch < 0;
 243       if (ch != *sptr)
 244         return false;
 245     }
 246   return true;
 247 }
 248
 249 /* Like _Jv_equal, but stop after N characters.  */
 250 jboolean
 251 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 252 {
 253   jint len = str->length();
 254   jint i = 0;
 255   jchar *sptr = _Jv_GetStringChars (str);
 256   unsigned char* ptr = (unsigned char*) a->data;
 257   unsigned char* limit = ptr + a->length;
 258   for (; n-- > 0; i++, sptr++)
 259     {
 260       int ch = UTF8_GET (ptr, limit);
 261       if (i == len)
 262         return ch < 0;
 263       if (ch != *sptr)
 264         return false;
 265     }
 266   return true;
 267 }
 268
 269 // Determines whether the given Utf8Const object contains
 270 // a type which is primitive or some derived form of it, eg.
 271 // an array or multi-dimensional array variant.
 272 jboolean
 273 _Jv_isPrimitiveOrDerived(const Utf8Const *a)
 274 {
 275   unsigned char *aptr = (unsigned char *) a->data;
 276   unsigned char *alimit = aptr + a->length;
 277   int ac = UTF8_GET(aptr, alimit);
 278
 279   // Skips any leading array marks.
 280   while (ac == '[')
 281     ac = UTF8_GET(aptr, alimit);
 282
 283   // There should not be another character. This implies that
 284   // the type name is only one character long.
 285   if (UTF8_GET(aptr, alimit) == -1)
 286     switch ( ac )
 287       {
 288         case 'Z':
 289         case 'B':
 290         case 'C':
 291         case 'S':
 292         case 'I':
 293         case 'J':
 294         case 'F':
 295         case 'D':
 296           return true;
 297         default:
 298           break;
 299        }
 300
 301    return false;
 302 }
 303
 304 // Find out whether two _Jv_Utf8Const candidates contain the same
 305 // classname.
 306 // The method is written to handle the different formats of classnames.
 307 // Eg. "Ljava/lang/Class;", "Ljava.lang.Class;", "java/lang/Class" and
 308 // "java.lang.Class" will be seen as equal.
 309 // Warning: This function is not smart enough to declare "Z" and "boolean"
 310 // and similar cases as equal (and is not meant to be used this way)!
 311 jboolean
 312 _Jv_equalUtf8Classnames (const Utf8Const *a, const Utf8Const *b)
 313 {
 314   // If the class name's length differs by two characters
 315   // it is possible that we have candidates which are given
 316   // in the two different formats ("Lp1/p2/cn;" vs. "p1/p2/cn")
 317   switch (a->length - b->length)
 318     {
 319       case -2:
 320       case 0:
 321       case 2:
 322         break;
 323       default:
 324         return false;
 325     }
 326
 327   unsigned char *aptr = (unsigned char *) a->data;
 328   unsigned char *alimit = aptr + a->length;
 329   unsigned char *bptr = (unsigned char *) b->data;
 330   unsigned char *blimit = bptr + b->length;
 331
 332   if (alimit[-1] == ';')
 333     alimit--;
 334
 335   if (blimit[-1] == ';')
 336     blimit--;
 337
 338   int ac = UTF8_GET(aptr, alimit);
 339   int bc = UTF8_GET(bptr, blimit);
 340
 341   // Checks whether both strings have the same amount of leading [ characters.
 342   while (ac == '[')
 343     {
 344       if (bc == '[')
 345         {
 346           ac = UTF8_GET(aptr, alimit);
 347           bc = UTF8_GET(bptr, blimit);
 348           continue;
 349         }
 350
 351       return false;
 352     }
 353
 354   // Skips leading L character.
 355   if (ac == 'L')
 356     ac = UTF8_GET(aptr, alimit);
 357
 358   if (bc == 'L')
 359     bc = UTF8_GET(bptr, blimit);
 360
 361   // Compares the remaining characters.
 362   while (ac != -1 && bc != -1)
 363     {
 364       // Replaces package separating dots with slashes.
 365       if (ac == '.')
 366         ac = '/';
 367
 368       if (bc == '.')
 369         bc = '/';
 370
 371       // Now classnames differ if there is at least one non-matching
 372       // character.
 373       if (ac != bc)
 374         return false;
 375
 376       ac = UTF8_GET(aptr, alimit);
 377       bc = UTF8_GET(bptr, blimit);
 378     }
 379
 380   return (ac == bc);
 381 }
 382
 383 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 384 int
 385 _Jv_strLengthUtf8(const char* str, int len)
 386 {
 387   unsigned char* ptr;
 388   unsigned char* limit;
 389   int str_length;
 390
 391   ptr = (unsigned char*) str;
 392   limit = ptr + len;
 393   str_length = 0;
 394   for (; ptr < limit; str_length++)
 395     {
 396       if (UTF8_GET (ptr, limit) < 0)
 397         return (-1);
 398     }
 399   return (str_length);
 400 }
 401
 402 /* Calculate a hash value for a string encoded in Utf8 format.
 403  * This returns the same hash value as specified or java.lang.String.hashCode.
 404  */
 405 jint
 406 _Jv_hashUtf8String (const char* str, int len)
 407 {
 408   unsigned char* ptr = (unsigned char*) str;
 409   unsigned char* limit = ptr + len;
 410   jint hash = 0;
 411
 412   for (; ptr < limit;)
 413     {
 414       int ch = UTF8_GET (ptr, limit);
 415       /* Updated specification from
 416          http://www.javasoft.com/docs/books/jls/clarify.html. */
 417       hash = (31 * hash) + ch;
 418     }
 419   return hash;
 420 }
 421
 422 void
 423 _Jv_Utf8Const::init(const char *s, int len)
 424 {
 425   ::memcpy (data, s, len);
 426   data[len] = 0;
 427   length = len;
 428   hash = _Jv_hashUtf8String (s, len) & 0xFFFF;
 429 }
 430
 431 _Jv_Utf8Const *
 432 _Jv_makeUtf8Const (const char* s, int len)
 433 {
 434   if (len < 0)
 435     len = strlen (s);
 436   Utf8Const* m
 437     = (Utf8Const*) _Jv_AllocBytes (_Jv_Utf8Const::space_needed(s, len));
 438   m->init(s, len);
 439   return m;
 440 }
 441
 442 _Jv_Utf8Const *
 443 _Jv_makeUtf8Const (jstring string)
 444 {
 445   jint hash = string->hashCode ();
 446   jint len = _Jv_GetStringUTFLength (string);
 447
 448   Utf8Const* m = (Utf8Const*)
 449     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 450
 451   m->hash = hash;
 452   m->length = len;
 453
 454   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 455   m->data[len] = 0;
 456
 457   return m;
 458 }
 459
 460 \f
 461
 462 #ifdef __GCJ_DEBUG
 463 void
 464 _Jv_Abort (const char *function, const char *file, int line,
 465            const char *message)
 466 #else
 467 void
 468 _Jv_Abort (const char *, const char *, int, const char *message)
 469 #endif
 470 {
 471 #ifdef __GCJ_DEBUG
 472   fprintf (stderr,
 473            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 474            message, function, file, line);
 475 #else
 476   fprintf (stderr, "libgcj failure: %s\n", message);
 477 #endif
 478   fflush (stderr);
 479   abort ();
 480 }
 481
 482 static void
 483 fail_on_finalization (jobject)
 484 {
 485   JvFail ("object was finalized");
 486 }
 487
 488 void
 489 _Jv_GCWatch (jobject obj)
 490 {
 491   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 492 }
 493
 494 void
 495 _Jv_ThrowBadArrayIndex(jint bad_index)
 496 {
 497   throw new java::lang::ArrayIndexOutOfBoundsException
 498     (java::lang::String::valueOf (bad_index));
 499 }
 500
 501 void
 502 _Jv_ThrowNullPointerException ()
 503 {
 504   throw new java::lang::NullPointerException;
 505 }
 506
 507 // Resolve an entry in the constant pool and return the target
 508 // address.
 509 void *
 510 _Jv_ResolvePoolEntry (jclass this_class, jint index)
 511 {
 512   _Jv_Constants *pool = &this_class->constants;
 513
 514   if ((pool->tags[index] & JV_CONSTANT_ResolvedFlag) != 0)
 515     return pool->data[index].field->u.addr;
 516
 517   JvSynchronize sync (this_class);
 518   return (_Jv_Linker::resolve_pool_entry (this_class, index))
 519     .field->u.addr;
 520 }
 521
 522
 523 // Explicitly throw a no memory exception.
 524 // The collector calls this when it encounters an out-of-memory condition.
 525 void _Jv_ThrowNoMemory()
 526 {
 527   throw no_memory;
 528 }
 529
 530 #ifdef ENABLE_JVMPI
 531 # define JVMPI_NOTIFY_ALLOC(klass,size,obj) \
 532     if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false)) \
 533       jvmpi_notify_alloc(klass,size,obj);
 534 static void
 535 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 536 {
 537   // Service JVMPI allocation request.
 538   JVMPI_Event event;
 539
 540   event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 541   event.env_id = NULL;
 542   event.u.obj_alloc.arena_id = 0;
 543   event.u.obj_alloc.class_id = (jobjectID) klass;
 544   event.u.obj_alloc.is_array = 0;
 545   event.u.obj_alloc.size = size;
 546   event.u.obj_alloc.obj_id = (jobjectID) obj;
 547
 548   // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 549   // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 550   // More importantly, I don't see the need for disabling GC, since we
 551   // blatantly have a pointer to obj on our stack, ensuring that the
 552   // object can't be collected.  Even for a nonconservative collector,
 553   // it appears to me that this must be true, since we are about to
 554   // return obj. Isn't this whole approach way too intrusive for
 555   // a useful profiling interface?                      - HB
 556   _Jv_DisableGC ();
 557   (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 558   _Jv_EnableGC ();
 559 }
 560 #else /* !ENABLE_JVMPI */
 561 # define JVMPI_NOTIFY_ALLOC(klass,size,obj) /* do nothing */
 562 #endif
 563
 564 // Allocate a new object of class KLASS.
 565 // First a version that assumes that we have no finalizer, and that
 566 // the class is already initialized.
 567 // If we know that JVMPI is disabled, this can be replaced by a direct call
 568 // to the allocator for the appropriate GC.
 569 jobject
 570 _Jv_AllocObjectNoInitNoFinalizer (jclass klass)
 571 {
 572   jint size = klass->size ();
 573   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 574   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 575   return obj;
 576 }
 577
 578 // And now a version that initializes if necessary.
 579 jobject
 580 _Jv_AllocObjectNoFinalizer (jclass klass)
 581 {
 582   if (_Jv_IsPhantomClass(klass) )
 583     throw new java::lang::NoClassDefFoundError(klass->getName());
 584
 585   _Jv_InitClass (klass);
 586   jint size = klass->size ();
 587   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 588   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 589   return obj;
 590 }
 591
 592 // And now the general version that registers a finalizer if necessary.
 593 jobject
 594 _Jv_AllocObject (jclass klass)
 595 {
 596   jobject obj = _Jv_AllocObjectNoFinalizer (klass);
 597
 598   // We assume that the compiler only generates calls to this routine
 599   // if there really is an interesting finalizer.
 600   // Unfortunately, we still have to the dynamic test, since there may
 601   // be cni calls to this routine.
 602   // Note that on IA64 get_finalizer() returns the starting address of the
 603   // function, not a function pointer.  Thus this still works.
 604   if (klass->vtable->get_finalizer ()
 605       != java::lang::Object::class$.vtable->get_finalizer ())
 606     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 607   return obj;
 608 }
 609
 610 // Allocate a String, including variable length storage.
 611 jstring
 612 _Jv_AllocString(jsize len)
 613 {
 614   using namespace java::lang;
 615
 616   jsize sz = sizeof(java::lang::String) + len * sizeof(jchar);
 617
 618   // We assert that for strings allocated this way, the data field
 619   // will always point to the object itself.  Thus there is no reason
 620   // for the garbage collector to scan any of it.
 621   // Furthermore, we're about to overwrite the string data, so
 622   // initialization of the object is not an issue.
 623
 624   // String needs no initialization, and there is no finalizer, so
 625   // we can go directly to the collector's allocator interface.
 626   jstring obj = (jstring) _Jv_AllocPtrFreeObj(sz, &String::class$);
 627
 628   obj->data = obj;
 629   obj->boffset = sizeof(java::lang::String);
 630   obj->count = len;
 631   obj->cachedHashCode = 0;
 632
 633   JVMPI_NOTIFY_ALLOC (&String::class$, sz, obj);
 634
 635   return obj;
 636 }
 637
 638 // A version of the above that assumes the object contains no pointers,
 639 // and requires no finalization.  This can't happen if we need pointers
 640 // to locks.
 641 #ifdef JV_HASH_SYNCHRONIZATION
 642 jobject
 643 _Jv_AllocPtrFreeObject (jclass klass)
 644 {
 645   _Jv_InitClass (klass);
 646   jint size = klass->size ();
 647
 648   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 649
 650   JVMPI_NOTIFY_ALLOC (klass, size, obj);
 651
 652   return obj;
 653 }
 654 #endif /* JV_HASH_SYNCHRONIZATION */
 655
 656
 657 // Allocate a new array of Java objects.  Each object is of type
 658 // `elementClass'.  `init' is used to initialize each slot in the
 659 // array.
 660 jobjectArray
 661 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 662 {
 663   // Creating an array of an unresolved type is impossible. So we throw
 664   // the NoClassDefFoundError.
 665   if ( _Jv_IsPhantomClass(elementClass) )
 666     throw new java::lang::NoClassDefFoundError(elementClass->getName());
 667
 668   if (__builtin_expect (count < 0, false))
 669     throw new java::lang::NegativeArraySizeException;
 670
 671   JvAssert (! elementClass->isPrimitive ());
 672
 673   // Ensure that elements pointer is properly aligned.
 674   jobjectArray obj = NULL;
 675   size_t size = (size_t) elements (obj);
 676   // Check for overflow.
 677   if (__builtin_expect ((size_t) count >
 678                         (MAX_OBJECT_SIZE - 1 - size) / sizeof (jobject), false))
 679     throw no_memory;
 680
 681   size += count * sizeof (jobject);
 682
 683   jclass klass = _Jv_GetArrayClass (elementClass,
 684                                     elementClass->getClassLoaderInternal());
 685
 686   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 687   // Cast away const.
 688   jsize *lp = const_cast<jsize *> (&obj->length);
 689   *lp = count;
 690   // We know the allocator returns zeroed memory.  So don't bother
 691   // zeroing it again.
 692   if (init)
 693     {
 694       jobject *ptr = elements(obj);
 695       while (--count >= 0)
 696         *ptr++ = init;
 697     }
 698   return obj;
 699 }
 700
 701 // Allocate a new array of primitives.  ELTYPE is the type of the
 702 // element, COUNT is the size of the array.
 703 jobject
 704 _Jv_NewPrimArray (jclass eltype, jint count)
 705 {
 706   int elsize = eltype->size();
 707   if (__builtin_expect (count < 0, false))
 708     throw new java::lang::NegativeArraySizeException;
 709
 710   JvAssert (eltype->isPrimitive ());
 711   jobject dummy = NULL;
 712   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 713
 714   // Check for overflow.
 715   if (__builtin_expect ((size_t) count >
 716                         (MAX_OBJECT_SIZE - size) / elsize, false))
 717     throw no_memory;
 718
 719   jclass klass = _Jv_GetArrayClass (eltype, 0);
 720
 721 # ifdef JV_HASH_SYNCHRONIZATION
 722   // Since the vtable is always statically allocated,
 723   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 724   __JArray *arr =
 725     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 726   memset((char *)arr + size, 0, elsize * count);
 727 # else
 728   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 729   // Note that we assume we are given zeroed memory by the allocator.
 730 # endif
 731   // Cast away const.
 732   jsize *lp = const_cast<jsize *> (&arr->length);
 733   *lp = count;
 734
 735   return arr;
 736 }
 737
 738 jobject
 739 _Jv_NewArray (jint type, jint size)
 740 {
 741   switch (type)
 742     {
 743       case  4:  return JvNewBooleanArray (size);
 744       case  5:  return JvNewCharArray (size);
 745       case  6:  return JvNewFloatArray (size);
 746       case  7:  return JvNewDoubleArray (size);
 747       case  8:  return JvNewByteArray (size);
 748       case  9:  return JvNewShortArray (size);
 749       case 10:  return JvNewIntArray (size);
 750       case 11:  return JvNewLongArray (size);
 751     }
 752   throw new java::lang::InternalError
 753     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 754 }
 755
 756 // Allocate a possibly multi-dimensional array but don't check that
 757 // any array length is <0.
 758 static jobject
 759 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 760 {
 761   JvAssert (type->isArray());
 762   jclass element_type = type->getComponentType();
 763   jobject result;
 764   if (element_type->isPrimitive())
 765     result = _Jv_NewPrimArray (element_type, sizes[0]);
 766   else
 767     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 768
 769   if (dimensions > 1)
 770     {
 771       JvAssert (! element_type->isPrimitive());
 772       JvAssert (element_type->isArray());
 773       jobject *contents = elements ((jobjectArray) result);
 774       for (int i = 0; i < sizes[0]; ++i)
 775         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 776                                                   sizes + 1);
 777     }
 778
 779   return result;
 780 }
 781
 782 jobject
 783 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 784 {
 785   for (int i = 0; i < dimensions; ++i)
 786     if (sizes[i] < 0)
 787       throw new java::lang::NegativeArraySizeException;
 788
 789   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 790 }
 791
 792 jobject
 793 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 794 {
 795   // Creating an array of an unresolved type is impossible. So we throw
 796   // the NoClassDefFoundError.
 797   if (_Jv_IsPhantomClass(array_type))
 798     throw new java::lang::NoClassDefFoundError(array_type->getName());
 799
 800   va_list args;
 801   jint sizes[dimensions];
 802   va_start (args, dimensions);
 803   for (int i = 0; i < dimensions; ++i)
 804     {
 805       jint size = va_arg (args, jint);
 806       if (size < 0)
 807         throw new java::lang::NegativeArraySizeException;
 808       sizes[i] = size;
 809     }
 810   va_end (args);
 811
 812   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 813 }
 814
 815 \f
 816
 817 // Ensure 8-byte alignment, for hash synchronization.
 818 #define DECLARE_PRIM_TYPE(NAME)                 \
 819   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 820
 821 DECLARE_PRIM_TYPE(byte)
 822 DECLARE_PRIM_TYPE(short)
 823 DECLARE_PRIM_TYPE(int)
 824 DECLARE_PRIM_TYPE(long)
 825 DECLARE_PRIM_TYPE(boolean)
 826 DECLARE_PRIM_TYPE(char)
 827 DECLARE_PRIM_TYPE(float)
 828 DECLARE_PRIM_TYPE(double)
 829 DECLARE_PRIM_TYPE(void)
 830
 831 void
 832 _Jv_InitPrimClass (jclass cl, const char *cname, char sig, int len)
 833 {
 834   using namespace java::lang::reflect;
 835
 836   // We must set the vtable for the class; the Java constructor
 837   // doesn't do this.
 838   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 839
 840   // Initialize the fields we care about.  We do this in the same
 841   // order they are declared in Class.h.
 842   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 843   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 844   cl->method_count = sig;
 845   cl->size_in_bytes = len;
 846   cl->vtable = JV_PRIMITIVE_VTABLE;
 847   cl->state = JV_STATE_DONE;
 848   cl->depth = -1;
 849 }
 850
 851 jclass
 852 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader,
 853                             char **endp)
 854 {
 855   // First count arrays.
 856   int array_count = 0;
 857   while (*sig == '[')
 858     {
 859       ++sig;
 860       ++array_count;
 861     }
 862
 863   jclass result = NULL;
 864   switch (*sig)
 865     {
 866     case 'B':
 867       result = JvPrimClass (byte);
 868       break;
 869     case 'S':
 870       result = JvPrimClass (short);
 871       break;
 872     case 'I':
 873       result = JvPrimClass (int);
 874       break;
 875     case 'J':
 876       result = JvPrimClass (long);
 877       break;
 878     case 'Z':
 879       result = JvPrimClass (boolean);
 880       break;
 881     case 'C':
 882       result = JvPrimClass (char);
 883       break;
 884     case 'F':
 885       result = JvPrimClass (float);
 886       break;
 887     case 'D':
 888       result = JvPrimClass (double);
 889       break;
 890     case 'V':
 891       result = JvPrimClass (void);
 892       break;
 893     case 'L':
 894       {
 895         char *save = ++sig;
 896         while (*sig && *sig != ';')
 897           ++sig;
 898         // Do nothing if signature appears to be malformed.
 899         if (*sig == ';')
 900           {
 901             _Jv_Utf8Const *name = _Jv_makeUtf8Const (save, sig - save);
 902             result = _Jv_FindClass (name, loader);
 903           }
 904         break;
 905       }
 906     default:
 907       // Do nothing -- bad signature.
 908       break;
 909     }
 910
 911   if (endp)
 912     {
 913       // Not really the "end", but the last valid character that we
 914       // looked at.
 915       *endp = sig;
 916     }
 917
 918   if (! result)
 919     return NULL;
 920
 921   // Find arrays.
 922   while (array_count-- > 0)
 923     result = _Jv_GetArrayClass (result, loader);
 924   return result;
 925 }
 926
 927
 928 jclass
 929 _Jv_FindClassFromSignatureNoException (char *sig, java::lang::ClassLoader *loader,
 930                                        char **endp)
 931 {
 932   jclass klass;
 933
 934   try
 935     {
 936       klass = _Jv_FindClassFromSignature(sig, loader, endp);
 937     }
 938   catch (java::lang::NoClassDefFoundError *ncdfe)
 939     {
 940       return NULL;
 941     }
 942   catch (java::lang::ClassNotFoundException *cnfe)
 943     {
 944       return NULL;
 945     }
 946
 947   return klass;
 948 }
 949
 950 JArray<jstring> *
 951 JvConvertArgv (int argc, const char **argv)
 952 {
 953   if (argc < 0)
 954     argc = 0;
 955   jobjectArray ar = JvNewObjectArray(argc, &java::lang::String::class$, NULL);
 956   jobject *ptr = elements(ar);
 957   jbyteArray bytes = NULL;
 958   for (int i = 0;  i < argc;  i++)
 959     {
 960       const char *arg = argv[i];
 961       int len = strlen (arg);
 962       if (bytes == NULL || bytes->length < len)
 963         bytes = JvNewByteArray (len);
 964       jbyte *bytePtr = elements (bytes);
 965       // We assume jbyte == char.
 966       memcpy (bytePtr, arg, len);
 967
 968       // Now convert using the default encoding.
 969       *ptr++ = new java::lang::String (bytes, 0, len);
 970     }
 971   return (JArray<jstring>*) ar;
 972 }
 973
 974 // FIXME: These variables are static so that they will be
 975 // automatically scanned by the Boehm collector.  This is needed
 976 // because with qthreads the collector won't scan the initial stack --
 977 // it will only scan the qthreads stacks.
 978
 979 // Command line arguments.
 980 static JArray<jstring> *arg_vec;
 981
 982 // The primary thread.
 983 static java::lang::Thread *main_thread;
 984
 985 #ifndef DISABLE_GETENV_PROPERTIES
 986
 987 #define c_isspace(c) (memchr (" \t\n\r\v\f", c, 6) != NULL)
 988
 989 static char *
 990 next_property_key (char *s, size_t *length)
 991 {
 992   size_t l = 0;
 993
 994   JvAssert (s);
 995
 996   // Skip over whitespace
 997   while (c_isspace (*s))
 998     s++;
 999
1000   // If we've reached the end, return NULL.  Also return NULL if for
1001   // some reason we've come across a malformed property string.
1002   if (*s == 0
1003       || *s == ':'
1004       || *s == '=')
1005     return NULL;
1006
1007   // Determine the length of the property key.
1008   while (s[l] != 0
1009          && ! c_isspace (s[l])
1010          && s[l] != ':'
1011          && s[l] != '=')
1012     {
1013       if (s[l] == '\\'
1014           && s[l+1] != 0)
1015         l++;
1016       l++;
1017     }
1018
1019   *length = l;
1020
1021   return s;
1022 }
1023
1024 static char *
1025 next_property_value (char *s, size_t *length)
1026 {
1027   size_t l = 0;
1028
1029   JvAssert (s);
1030
1031   while (c_isspace (*s))
1032     s++;
1033
1034   if (*s == ':'
1035       || *s == '=')
1036     s++;
1037
1038   while (c_isspace (*s))
1039     s++;
1040
1041   // Determine the length of the property value.
1042   while (s[l] != 0
1043          && ! c_isspace (s[l])
1044          && s[l] != ':'
1045          && s[l] != '=')
1046     {
1047       if (s[l] == '\\'
1048           && s[l+1] != 0)
1049         l += 2;
1050       else
1051         l++;
1052     }
1053
1054   *length = l;
1055
1056   return s;
1057 }
1058
1059 static void
1060 process_gcj_properties ()
1061 {
1062   char *props = getenv("GCJ_PROPERTIES");
1063
1064   if (NULL == props)
1065     return;
1066
1067   // Later on we will write \0s into this string.  It is simplest to
1068   // just duplicate it here.
1069   props = strdup (props);
1070
1071   char *p = props;
1072   size_t length;
1073   size_t property_count = 0;
1074
1075   // Whip through props quickly in order to count the number of
1076   // property values.
1077   while (p && (p = next_property_key (p, &length)))
1078     {
1079       // Skip to the end of the key
1080       p += length;
1081
1082       p = next_property_value (p, &length);
1083       if (p)
1084         p += length;
1085
1086       property_count++;
1087     }
1088
1089   // Allocate an array of property value/key pairs.
1090   _Jv_Environment_Properties =
1091     (property_pair *) malloc (sizeof(property_pair)
1092                               * (property_count + 1));
1093
1094   // Go through the properties again, initializing _Jv_Properties
1095   // along the way.
1096   p = props;
1097   property_count = 0;
1098   while (p && (p = next_property_key (p, &length)))
1099     {
1100       _Jv_Environment_Properties[property_count].key = p;
1101       _Jv_Environment_Properties[property_count].key_length = length;
1102
1103       // Skip to the end of the key
1104       p += length;
1105
1106       p = next_property_value (p, &length);
1107
1108       _Jv_Environment_Properties[property_count].value = p;
1109       _Jv_Environment_Properties[property_count].value_length = length;
1110
1111       if (p)
1112         p += length;
1113
1114       property_count++;
1115     }
1116   memset ((void *) &_Jv_Environment_Properties[property_count],
1117           0, sizeof (property_pair));
1118
1119   // Null terminate the strings.
1120   for (property_pair *prop = &_Jv_Environment_Properties[0];
1121        prop->key != NULL;
1122        prop++)
1123     {
1124       prop->key[prop->key_length] = 0;
1125       prop->value[prop->value_length] = 0;
1126     }
1127 }
1128 #endif // DISABLE_GETENV_PROPERTIES
1129
1130 namespace gcj
1131 {
1132   _Jv_Utf8Const *void_signature;
1133   _Jv_Utf8Const *clinit_name;
1134   _Jv_Utf8Const *init_name;
1135   _Jv_Utf8Const *finit_name;
1136
1137   bool runtimeInitialized = false;
1138
1139   // When true, print debugging information about class loading.
1140   bool verbose_class_flag;
1141
1142   // When true, enable the bytecode verifier and BC-ABI type verification.
1143   bool verifyClasses = true;
1144
1145   // Thread stack size specified by the -Xss runtime argument.
1146   size_t stack_size = 0;
1147
1148   // Start time of the VM
1149   jlong startTime = 0;
1150
1151   // Arguments passed to the VM
1152   JArray<jstring>* vmArgs;
1153
1154   // Currently loaded classes
1155   jint loadedClasses = 0;
1156
1157   // Unloaded classes
1158   jlong unloadedClasses = 0;
1159 }
1160
1161 // We accept all non-standard options accepted by Sun's java command,
1162 // for compatibility with existing application launch scripts.
1163 static jint
1164 parse_x_arg (char* option_string)
1165 {
1166   if (strlen (option_string) <= 0)
1167     return -1;
1168
1169   if (! strcmp (option_string, "int"))
1170     {
1171       // FIXME: this should cause the vm to never load shared objects
1172     }
1173   else if (! strcmp (option_string, "mixed"))
1174     {
1175       // FIXME: allow interpreted and native code
1176     }
1177   else if (! strcmp (option_string, "batch"))
1178     {
1179       // FIXME: disable background JIT'ing
1180     }
1181   else if (! strcmp (option_string, "debug"))
1182     {
1183       remoteDebug = true;
1184     }
1185 #ifdef INTERPRETER
1186   else if (! strncmp (option_string, "runjdwp:", 8))
1187     {
1188       if (strlen (option_string) > 8)
1189           jdwpOptions = &option_string[8];
1190       else
1191         {
1192           fprintf (stderr,
1193                    "libgcj: argument required for JDWP options");
1194           return -1;
1195         }
1196     }
1197 #endif // INTERPRETER
1198   else if (! strncmp (option_string, "bootclasspath:", 14))
1199     {
1200       // FIXME: add a parse_bootclasspath_arg function
1201     }
1202   else if (! strncmp (option_string, "bootclasspath/a:", 16))
1203     {
1204     }
1205   else if (! strncmp (option_string, "bootclasspath/p:", 16))
1206     {
1207     }
1208   else if (! strcmp (option_string, "check:jni"))
1209     {
1210       // FIXME: enable strict JNI checking
1211     }
1212   else if (! strcmp (option_string, "future"))
1213     {
1214       // FIXME: enable strict class file format checks
1215     }
1216   else if (! strcmp (option_string, "noclassgc"))
1217     {
1218       // FIXME: disable garbage collection for classes
1219     }
1220   else if (! strcmp (option_string, "incgc"))
1221     {
1222       // FIXME: incremental garbage collection
1223     }
1224   else if (! strncmp (option_string, "loggc:", 6))
1225     {
1226       if (option_string[6] == '\0')
1227         {
1228           fprintf (stderr,
1229                    "libgcj: filename argument expected for loggc option\n");
1230           return -1;
1231         }
1232       // FIXME: set gc logging filename
1233     }
1234   else if (! strncmp (option_string, "ms", 2))
1235     {
1236       // FIXME: ignore this option until PR 20699 is fixed.
1237       // _Jv_SetInitialHeapSize (option_string + 2);
1238     }
1239   else if (! strncmp (option_string, "mx", 2))
1240     _Jv_SetMaximumHeapSize (option_string + 2);
1241   else if (! strcmp (option_string, "prof"))
1242     {
1243       // FIXME: enable profiling of program running in vm
1244     }
1245   else if (! strncmp (option_string, "runhprof:", 9))
1246     {
1247       // FIXME: enable specific type of vm profiling.  add a
1248       // parse_runhprof_arg function
1249     }
1250   else if (! strcmp (option_string, "rs"))
1251     {
1252       // FIXME: reduced system signal usage.  disable thread dumps,
1253       // only terminate in response to user-initiated calls,
1254       // e.g. System.exit()
1255     }
1256   else if (! strncmp (option_string, "ss", 2))
1257     {
1258       _Jv_SetStackSize (option_string + 2);
1259     }
1260   else if (! strcmp (option_string, "X:+UseAltSigs"))
1261     {
1262       // FIXME: use signals other than SIGUSR1 and SIGUSR2
1263     }
1264   else if (! strcmp (option_string, "share:off"))
1265     {
1266       // FIXME: don't share class data
1267     }
1268   else if (! strcmp (option_string, "share:auto"))
1269     {
1270       // FIXME: share class data where possible
1271     }
1272   else if (! strcmp (option_string, "share:on"))
1273     {
1274       // FIXME: fail if impossible to share class data
1275     }
1276   else
1277     {
1278       // Unrecognized.
1279       return -1;
1280     }
1281   return 0;
1282 }
1283
1284 static jint
1285 parse_verbose_args (char* option_string,
1286                     bool ignore_unrecognized)
1287 {
1288   size_t len = sizeof ("-verbose") - 1;
1289
1290   if (strlen (option_string) < len)
1291     return -1;
1292
1293   if (option_string[len] == ':'
1294       && option_string[len + 1] != '\0')
1295     {
1296       char* verbose_args = option_string + len + 1;
1297
1298       do
1299         {
1300           if (! strncmp (verbose_args,
1301                          "gc", sizeof ("gc") - 1))
1302             {
1303               if (verbose_args[sizeof ("gc") - 1] == '\0'
1304                   || verbose_args[sizeof ("gc") - 1] == ',')
1305                 {
1306                   // FIXME: we should add functions to boehm-gc that
1307                   // toggle GC_print_stats, GC_PRINT_ADDRESS_MAP and
1308                   // GC_print_back_height.
1309                   verbose_args += sizeof ("gc") - 1;
1310                 }
1311               else
1312                 {
1313                 verbose_arg_err:
1314                   fprintf (stderr, "libgcj: unknown verbose option: %s\n",
1315                            option_string);
1316                   return -1;
1317                 }
1318             }
1319           else if (! strncmp (verbose_args,
1320                               "class",
1321                               sizeof ("class") - 1))
1322             {
1323               if (verbose_args[sizeof ("class") - 1] == '\0'
1324                   || verbose_args[sizeof ("class") - 1] == ',')
1325                 {
1326                   gcj::verbose_class_flag = true;
1327                   verbose_args += sizeof ("class") - 1;
1328                 }
1329               else
1330                 goto verbose_arg_err;
1331             }
1332           else if (! strncmp (verbose_args, "jni",
1333                               sizeof ("jni") - 1))
1334             {
1335               if (verbose_args[sizeof ("jni") - 1] == '\0'
1336                   || verbose_args[sizeof ("jni") - 1] == ',')
1337                 {
1338                   // FIXME: enable JNI messages.
1339                   verbose_args += sizeof ("jni") - 1;
1340                 }
1341               else
1342                 goto verbose_arg_err;
1343             }
1344           else if (ignore_unrecognized
1345                    && verbose_args[0] == 'X')
1346             {
1347               // ignore unrecognized non-standard verbose option
1348               while (verbose_args[0] != '\0'
1349                      && verbose_args[0] != ',')
1350                 verbose_args++;
1351             }
1352           else if (verbose_args[0] == ',')
1353             {
1354               verbose_args++;
1355             }
1356           else
1357             goto verbose_arg_err;
1358
1359           if (verbose_args[0] == ',')
1360             verbose_args++;
1361         }
1362       while (verbose_args[0] != '\0');
1363     }
1364   else if (option_string[len] == 'g'
1365            && option_string[len + 1] == 'c'
1366            && option_string[len + 2] == '\0')
1367     {
1368       // FIXME: we should add functions to boehm-gc that
1369       // toggle GC_print_stats, GC_PRINT_ADDRESS_MAP and
1370       // GC_print_back_height.
1371       return 0;
1372     }
1373   else if (option_string[len] == '\0')
1374     {
1375       gcj::verbose_class_flag = true;
1376       return 0;
1377     }
1378   else
1379     {
1380       // unrecognized option beginning with -verbose
1381       return -1;
1382     }
1383   return 0;
1384 }
1385
1386 #ifdef INTERPRETER
1387 // This function loads the agent functions for JVMTI from the library indicated
1388 // by name.  It returns a negative value on failure, the value of which
1389 // indicates where ltdl failed, it also prints an error message.
1390 static jint
1391 load_jvmti_agent (const char *name)
1392 {
1393 #ifdef USE_LTDL
1394   if (lt_dlinit ())
1395     {
1396       fprintf (stderr,
1397               "libgcj: Error in ltdl init while loading agent library.\n");
1398       return -1;
1399     }
1400
1401   lt_dlhandle lib = lt_dlopenext (name);
1402   if (!lib)
1403     {
1404       fprintf (stderr,
1405                "libgcj: Error opening agent library.\n");
1406       return -2;
1407     }
1408
1409   if (lib)
1410     {
1411       jvmti_agentonload
1412         = (jvmti_agent_onload_func *) lt_dlsym (lib, "Agent_OnLoad");
1413
1414       if (!jvmti_agentonload)
1415         {
1416           fprintf (stderr,
1417                    "libgcj: Error finding agent function in library %s.\n",
1418                    name);
1419           lt_dlclose (lib);
1420           lib = NULL;
1421           return -4;
1422         }
1423       else
1424         {
1425           jvmti_agentonunload
1426             = (jvmti_agent_onunload_func *) lt_dlsym (lib, "Agent_OnUnload");
1427
1428           return 0;
1429         }
1430     }
1431   else
1432     {
1433       fprintf (stderr, "libgcj: Library %s not found in library path.\n", name);
1434       return -3;
1435     }
1436
1437 #endif /* USE_LTDL */
1438
1439   // If LTDL cannot be used, return an error code indicating this.
1440   return -99;
1441 }
1442 #endif // INTERPRETER
1443
1444 static jint
1445 parse_init_args (JvVMInitArgs* vm_args)
1446 {
1447   // if _Jv_Compiler_Properties is non-NULL then it needs to be
1448   // re-allocated dynamically.
1449   if (_Jv_Compiler_Properties)
1450     {
1451       const char** props = _Jv_Compiler_Properties;
1452       _Jv_Compiler_Properties = NULL;
1453
1454       for (int i = 0; props[i]; i++)
1455         {
1456           _Jv_Compiler_Properties = (const char**) _Jv_Realloc
1457             (_Jv_Compiler_Properties,
1458              (_Jv_Properties_Count + 1) * sizeof (const char*));
1459           _Jv_Compiler_Properties[_Jv_Properties_Count++] = props[i];
1460         }
1461     }
1462
1463   if (vm_args == NULL)
1464     return 0;
1465
1466   for (int i = 0; i < vm_args->nOptions; ++i)
1467     {
1468       char* option_string = vm_args->options[i].optionString;
1469
1470       if (! strcmp (option_string, "vfprintf")
1471           || ! strcmp (option_string, "exit")
1472           || ! strcmp (option_string, "abort"))
1473         {
1474           // FIXME: we are required to recognize these, but for
1475           // now we don't handle them in any way.
1476           continue;
1477         }
1478       else if (! strncmp (option_string,
1479                           "-verbose", sizeof ("-verbose") - 1))
1480         {
1481           jint result = parse_verbose_args (option_string,
1482                                             vm_args->ignoreUnrecognized);
1483           if (result < 0)
1484             return result;
1485         }
1486       else if (! strncmp (option_string, "-D", 2))
1487         {
1488           _Jv_Compiler_Properties = (const char**) _Jv_Realloc
1489             (_Jv_Compiler_Properties,
1490              (_Jv_Properties_Count + 1) * sizeof (char*));
1491
1492           _Jv_Compiler_Properties[_Jv_Properties_Count++] =
1493             strdup (option_string + 2);
1494
1495           continue;
1496         }
1497 #ifdef INTERPRETER
1498       else if (! strncmp (option_string, "-agentlib", sizeof ("-agentlib") - 1))
1499         {
1500           char *strPtr;
1501
1502           if (strlen(option_string) > (sizeof ("-agentlib:") - 1))
1503             strPtr = &option_string[sizeof ("-agentlib:") - 1];
1504           else
1505             {
1506               fprintf (stderr,
1507                 "libgcj: Malformed agentlib argument %s: expected lib name\n",
1508                 option_string);
1509               return -1;
1510             }
1511
1512           // These are optional arguments to pass to the agent library.
1513           jvmti_agent_opts = strchr (strPtr, '=');
1514
1515           if (! strncmp (strPtr, "jdwp", 4))
1516             {
1517               // We want to run JDWP here so set the correct variables.
1518               remoteDebug = true;
1519               jdwpOptions = ++jvmti_agent_opts;
1520             }
1521           else
1522             {
1523               jint nameLength;
1524
1525               if (jvmti_agent_opts == NULL)
1526                 nameLength = strlen (strPtr);
1527               else
1528                 {
1529                   nameLength = jvmti_agent_opts - strPtr;
1530                   jvmti_agent_opts++;
1531                 }
1532
1533               char lib_name[nameLength + 3 + 1];
1534               strcpy (lib_name, "lib");
1535               strncat (lib_name, strPtr, nameLength);
1536
1537               jint result = load_jvmti_agent (lib_name);
1538
1539               if (result < 0)
1540                 {
1541                   return -1;
1542                 }
1543
1544               // Mark JVMTI active
1545               JVMTI::enabled = true;
1546             }
1547
1548           continue;
1549         }
1550       else if (! strncmp (option_string, "-agentpath:",
1551                           sizeof ("-agentpath:") - 1))
1552         {
1553           char *strPtr;
1554
1555           if (strlen(option_string) > 10)
1556             strPtr = &option_string[10];
1557           else
1558             {
1559               fprintf (stderr,
1560                 "libgcj: Malformed agentlib argument %s: expected lib path\n",
1561                 option_string);
1562               return -1;
1563             }
1564
1565           // These are optional arguments to pass to the agent library.
1566           jvmti_agent_opts = strchr (strPtr, '=');
1567
1568           jint nameLength;
1569
1570           if (jvmti_agent_opts == NULL)
1571             nameLength = strlen (strPtr);
1572           else
1573             {
1574               nameLength = jvmti_agent_opts - strPtr;
1575               jvmti_agent_opts++;
1576             }
1577
1578           char lib_name[nameLength + 3 + 1];
1579           strcpy (lib_name, "lib");
1580           strncat (lib_name, strPtr, nameLength);
1581           jint result = load_jvmti_agent (strPtr);
1582
1583           if (result < 0)
1584             {
1585               return -1;
1586             }
1587
1588           // Mark JVMTI active
1589           JVMTI::enabled = true;
1590           continue;
1591         }
1592 #endif // INTERPRETER
1593       else
1594         {
1595           int r = -1;
1596           if (option_string[0] == '_')
1597             r = parse_x_arg (option_string + 1);
1598           else if (! strncmp (option_string, "-X", 2))
1599             r = parse_x_arg (option_string + 2);
1600
1601           if (r == -1 && ! vm_args->ignoreUnrecognized)
1602             {
1603               fprintf (stderr, "libgcj: unknown option: %s\n", option_string);
1604               return -1;
1605             }
1606         }
1607     }
1608   return 0;
1609 }
1610
1611 jint
1612 _Jv_CreateJavaVM (JvVMInitArgs* vm_args)
1613 {
1614   using namespace gcj;
1615
1616   if (runtimeInitialized)
1617     return -1;
1618
1619   runtimeInitialized = true;
1620   startTime = _Jv_platform_gettimeofday();
1621
1622   jint result = parse_init_args (vm_args);
1623   if (result < 0)
1624     return -1;
1625
1626   PROCESS_GCJ_PROPERTIES;
1627
1628   /* Threads must be initialized before the GC, so that it inherits the
1629      signal mask.  */
1630   _Jv_InitThreads ();
1631   _Jv_InitGC ();
1632   _Jv_InitializeSyncMutex ();
1633
1634 #ifdef INTERPRETER
1635   _Jv_InitInterpreter ();
1636 #endif
1637
1638 #ifdef HANDLE_SEGV
1639   INIT_SEGV;
1640 #endif
1641
1642 #ifdef HANDLE_FPE
1643   INIT_FPE;
1644 #endif
1645
1646   /* Initialize Utf8 constants declared in jvm.h. */
1647   void_signature = _Jv_makeUtf8Const ("()V", 3);
1648   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
1649   init_name = _Jv_makeUtf8Const ("<init>", 6);
1650   finit_name = _Jv_makeUtf8Const ("finit$", 6);
1651
1652   /* Initialize built-in classes to represent primitive TYPEs. */
1653   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1);
1654   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2);
1655   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4);
1656   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8);
1657   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1);
1658   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2);
1659   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4);
1660   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8);
1661   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0);
1662
1663   // We have to initialize this fairly early, to avoid circular class
1664   // initialization.  In particular we want to start the
1665   // initialization of ClassLoader before we start the initialization
1666   // of VMClassLoader.
1667   _Jv_InitClass (&java::lang::ClassLoader::class$);
1668
1669   // Set up the system class loader and the bootstrap class loader.
1670   gnu::gcj::runtime::ExtensionClassLoader::initialize();
1671   java::lang::VMClassLoader::initialize(JvNewStringLatin1(TOOLEXECLIBDIR));
1672
1673   _Jv_RegisterBootstrapPackages();
1674
1675   no_memory = new java::lang::OutOfMemoryError;
1676
1677 #ifdef USE_LTDL
1678   LTDL_SET_PRELOADED_SYMBOLS ();
1679 #endif
1680
1681   _Jv_platform_initialize ();
1682
1683   _Jv_JNI_Init ();
1684
1685 #ifdef INTERPRETER
1686   _Jv_JVMTI_Init ();
1687 #endif
1688
1689   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
1690
1691   // Start the GC finalizer thread.  A VirtualMachineError can be
1692   // thrown by the runtime if, say, threads aren't available.
1693   try
1694     {
1695       using namespace gnu::gcj::runtime;
1696       FinalizerThread *ft = new FinalizerThread ();
1697       ft->start ();
1698     }
1699   catch (java::lang::VirtualMachineError *ignore)
1700     {
1701     }
1702
1703   runtimeInitialized = true;
1704
1705   return 0;
1706 }
1707
1708 void
1709 _Jv_RunMain (JvVMInitArgs *vm_args, jclass klass, const char *name, int argc,
1710              const char **argv, bool is_jar)
1711 {
1712 #ifndef DISABLE_MAIN_ARGS
1713   _Jv_SetArgs (argc, argv);
1714 #endif
1715
1716   java::lang::Runtime *runtime = NULL;
1717
1718   try
1719     {
1720       if (_Jv_CreateJavaVM (vm_args) < 0)
1721         {
1722           fprintf (stderr, "libgcj: couldn't create virtual machine\n");
1723           exit (1);
1724         }
1725
1726       if (vm_args == NULL)
1727         gcj::vmArgs = JvConvertArgv(0, NULL);
1728       else
1729         {
1730           const char* vmArgs[vm_args->nOptions];
1731           const char** vmPtr = vmArgs;
1732           struct _Jv_VMOption* optionPtr = vm_args->options;
1733           for (int i = 0; i < vm_args->nOptions; ++i)
1734             *vmPtr++ = (*optionPtr++).optionString;
1735           gcj::vmArgs = JvConvertArgv(vm_args->nOptions, vmArgs);
1736         }
1737
1738       // Get the Runtime here.  We want to initialize it before searching
1739       // for `main'; that way it will be set up if `main' is a JNI method.
1740       runtime = java::lang::Runtime::getRuntime ();
1741
1742 #ifdef DISABLE_MAIN_ARGS
1743       arg_vec = JvConvertArgv (0, 0);
1744 #else
1745       arg_vec = JvConvertArgv (argc - 1, argv + 1);
1746 #endif
1747
1748       using namespace gnu::java::lang;
1749       if (klass)
1750         main_thread = new MainThread (klass, arg_vec);
1751       else
1752         main_thread = new MainThread (JvNewStringUTF (name),
1753                                       arg_vec, is_jar);
1754       _Jv_AttachCurrentThread (main_thread);
1755
1756 #ifdef INTERPRETER
1757       // Start JVMTI if an agent function has been found.
1758       if (jvmti_agentonload)
1759         (*jvmti_agentonload) (_Jv_GetJavaVM (), jvmti_agent_opts, NULL);
1760
1761       // Start JDWP
1762       if (remoteDebug)
1763         {
1764           using namespace gnu::classpath::jdwp;
1765           VMVirtualMachine::initialize ();
1766           Jdwp *jdwp = new Jdwp ();
1767           jdwp->setDaemon (true);
1768           jdwp->configure (JvNewStringLatin1 (jdwpOptions));
1769           jdwp->start ();
1770
1771           // Wait for JDWP to initialize and start
1772           jdwp->join ();
1773         }
1774       // Send VMInit
1775       if (JVMTI_REQUESTED_EVENT (VMInit))
1776         _Jv_JVMTI_PostEvent (JVMTI_EVENT_VM_INIT, main_thread);
1777 #endif // INTERPRETER
1778     }
1779   catch (java::lang::Throwable *t)
1780     {
1781       java::lang::System::err->println (JvNewStringLatin1
1782         ("Exception during runtime initialization"));
1783       t->printStackTrace();
1784       if (runtime)
1785         java::lang::Runtime::exitNoChecksAccessor (1);
1786       // In case the runtime creation failed.
1787       ::exit (1);
1788     }
1789
1790   _Jv_ThreadRun (main_thread);
1791
1792 #ifdef INTERPRETER
1793   // Send VMDeath
1794   if (JVMTI_REQUESTED_EVENT (VMDeath))
1795     {
1796       java::lang::Thread *thread = java::lang::Thread::currentThread ();
1797       JNIEnv *jni_env = _Jv_GetCurrentJNIEnv ();
1798       _Jv_JVMTI_PostEvent (JVMTI_EVENT_VM_DEATH, thread, jni_env);
1799     }
1800
1801   // Run JVMTI AgentOnUnload if it exists and an agent is loaded.
1802   if (jvmti_agentonunload)
1803     (*jvmti_agentonunload) (_Jv_GetJavaVM ());
1804 #endif // INTERPRETER
1805
1806   // If we got here then something went wrong, as MainThread is not
1807   // supposed to terminate.
1808   ::exit (1);
1809 }
1810
1811 void
1812 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
1813              bool is_jar)
1814 {
1815   _Jv_RunMain (NULL, klass, name, argc, argv, is_jar);
1816 }
1817
1818 void
1819 JvRunMain (jclass klass, int argc, const char **argv)
1820 {
1821   _Jv_RunMain (klass, NULL, argc, argv, false);
1822 }
1823
1824 void
1825 JvRunMainName (const char *name, int argc, const char **argv)
1826 {
1827   _Jv_RunMain (NULL, name, argc, argv, false);
1828 }
1829
1830 \f
1831
1832 // Parse a string and return a heap size.
1833 static size_t
1834 parse_memory_size (const char *spec)
1835 {
1836   char *end;
1837   unsigned long val = strtoul (spec, &end, 10);
1838   if (*end == 'k' || *end == 'K')
1839     val *= 1024;
1840   else if (*end == 'm' || *end == 'M')
1841     val *= 1048576;
1842   return (size_t) val;
1843 }
1844
1845 // Set the initial heap size.  This might be ignored by the GC layer.
1846 // This must be called before _Jv_RunMain.
1847 void
1848 _Jv_SetInitialHeapSize (const char *arg)
1849 {
1850   size_t size = parse_memory_size (arg);
1851   _Jv_GCSetInitialHeapSize (size);
1852 }
1853
1854 // Set the maximum heap size.  This might be ignored by the GC layer.
1855 // This must be called before _Jv_RunMain.
1856 void
1857 _Jv_SetMaximumHeapSize (const char *arg)
1858 {
1859   size_t size = parse_memory_size (arg);
1860   _Jv_GCSetMaximumHeapSize (size);
1861 }
1862
1863 void
1864 _Jv_SetStackSize (const char *arg)
1865 {
1866   size_t size = parse_memory_size (arg);
1867   gcj::stack_size = size;
1868 }
1869
1870 void *
1871 _Jv_Malloc (jsize size)
1872 {
1873   if (__builtin_expect (size == 0, false))
1874     size = 1;
1875   void *ptr = malloc ((size_t) size);
1876   if (__builtin_expect (ptr == NULL, false))
1877     throw no_memory;
1878   return ptr;
1879 }
1880
1881 void *
1882 _Jv_Realloc (void *ptr, jsize size)
1883 {
1884   if (__builtin_expect (size == 0, false))
1885     size = 1;
1886   ptr = realloc (ptr, (size_t) size);
1887   if (__builtin_expect (ptr == NULL, false))
1888     throw no_memory;
1889   return ptr;
1890 }
1891
1892 void *
1893 _Jv_MallocUnchecked (jsize size)
1894 {
1895   if (__builtin_expect (size == 0, false))
1896     size = 1;
1897   return malloc ((size_t) size);
1898 }
1899
1900 void
1901 _Jv_Free (void* ptr)
1902 {
1903   return free (ptr);
1904 }
1905
1906 \f
1907
1908 // In theory, these routines can be #ifdef'd away on machines which
1909 // support divide overflow signals.  However, we never know if some
1910 // code might have been compiled with "-fuse-divide-subroutine", so we
1911 // always include them in libgcj.
1912
1913 jint
1914 _Jv_divI (jint dividend, jint divisor)
1915 {
1916   if (__builtin_expect (divisor == 0, false))
1917     {
1918       java::lang::ArithmeticException *arithexception
1919         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1920       throw arithexception;
1921     }
1922
1923   if (dividend == (jint) 0x80000000L && divisor == -1)
1924     return dividend;
1925
1926   return dividend / divisor;
1927 }
1928
1929 jint
1930 _Jv_remI (jint dividend, jint divisor)
1931 {
1932   if (__builtin_expect (divisor == 0, false))
1933     {
1934       java::lang::ArithmeticException *arithexception
1935         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1936       throw arithexception;
1937     }
1938
1939   if (dividend == (jint) 0x80000000L && divisor == -1)
1940     return 0;
1941
1942   return dividend % divisor;
1943 }
1944
1945 jlong
1946 _Jv_divJ (jlong dividend, jlong divisor)
1947 {
1948   if (__builtin_expect (divisor == 0, false))
1949     {
1950       java::lang::ArithmeticException *arithexception
1951         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1952       throw arithexception;
1953     }
1954
1955   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1956     return dividend;
1957
1958   return dividend / divisor;
1959 }
1960
1961 jlong
1962 _Jv_remJ (jlong dividend, jlong divisor)
1963 {
1964   if (__builtin_expect (divisor == 0, false))
1965     {
1966       java::lang::ArithmeticException *arithexception
1967         = new java::lang::ArithmeticException (JvNewStringLatin1 ("/ by zero"));
1968       throw arithexception;
1969     }
1970
1971   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1972     return 0;
1973
1974   return dividend % divisor;
1975 }
1976
1977 \f
1978
1979 // Return true if SELF_KLASS can access a field or method in
1980 // OTHER_KLASS.  The field or method's access flags are specified in
1981 // FLAGS.
1982 jboolean
1983 _Jv_CheckAccess (jclass self_klass, jclass other_klass, jint flags)
1984 {
1985   using namespace java::lang::reflect;
1986   return ((self_klass == other_klass)
1987           || ((flags & Modifier::PUBLIC) != 0)
1988           || (((flags & Modifier::PROTECTED) != 0)
1989               && _Jv_IsAssignableFromSlow (self_klass, other_klass))
1990           || (((flags & Modifier::PRIVATE) == 0)
1991               && _Jv_ClassNameSamePackage (self_klass->name,
1992                                            other_klass->name)));
1993 }
1994
1995 // Prepend GCJ_VERSIONED_LIBDIR to a module search path stored in a C
1996 // char array, if the path is not already prefixed by
1997 // GCJ_VERSIONED_LIBDIR.  Return a newly JvMalloc'd char buffer.  The
1998 // result should be freed using JvFree.
1999 char*
2000 _Jv_PrependVersionedLibdir (char* libpath)
2001 {
2002   char* retval = 0;
2003
2004   if (libpath && libpath[0] != '\0')
2005     {
2006       if (! strncmp (libpath,
2007                      GCJ_VERSIONED_LIBDIR,
2008                      sizeof (GCJ_VERSIONED_LIBDIR) - 1))
2009         {
2010           // LD_LIBRARY_PATH is already prefixed with
2011           // GCJ_VERSIONED_LIBDIR.
2012           retval = (char*) _Jv_Malloc (strlen (libpath) + 1);
2013           strcpy (retval, libpath);
2014         }
2015       else
2016         {
2017           // LD_LIBRARY_PATH is not prefixed with
2018           // GCJ_VERSIONED_LIBDIR.
2019           char path_sep[2];
2020           path_sep[0] = (char) _Jv_platform_path_separator;
2021           path_sep[1] = '\0';
2022           jsize total = ((sizeof (GCJ_VERSIONED_LIBDIR) - 1)
2023                          + 1 /* path separator */ + strlen (libpath) + 1);
2024           retval = (char*) _Jv_Malloc (total);
2025           strcpy (retval, GCJ_VERSIONED_LIBDIR);
2026           strcat (retval, path_sep);
2027           strcat (retval, libpath);
2028         }
2029     }
2030   else
2031     {
2032       // LD_LIBRARY_PATH was not specified or is empty.
2033       retval = (char*) _Jv_Malloc (sizeof (GCJ_VERSIONED_LIBDIR));
2034       strcpy (retval, GCJ_VERSIONED_LIBDIR);
2035     }
2036
2037   return retval;
2038 }