libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <config.h>
  12 #include <platform.h>
  13
  14 #include <stdlib.h>
  15 #include <stdarg.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <signal.h>
  19
  20 #ifdef HAVE_UNISTD_H
  21 #include <unistd.h>
  22 #endif
  23
  24 #include <gcj/cni.h>
  25 #include <jvm.h>
  26 #include <java-signal.h>
  27 #include <java-threads.h>
  28
  29 #ifdef ENABLE_JVMPI
  30 #include <jvmpi.h>
  31 #include <java/lang/ThreadGroup.h>
  32 #endif
  33
  34 #ifndef DISABLE_GETENV_PROPERTIES
  35 #include <ctype.h>
  36 #include <java-props.h>
  37 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  38 #else
  39 #define PROCESS_GCJ_PROPERTIES
  40 #endif // DISABLE_GETENV_PROPERTIES
  41
  42 #include <java/lang/Class.h>
  43 #include <java/lang/ClassLoader.h>
  44 #include <java/lang/Runtime.h>
  45 #include <java/lang/String.h>
  46 #include <java/lang/Thread.h>
  47 #include <java/lang/ThreadGroup.h>
  48 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  49 #include <java/lang/ArithmeticException.h>
  50 #include <java/lang/ClassFormatError.h>
  51 #include <java/lang/InternalError.h>
  52 #include <java/lang/NegativeArraySizeException.h>
  53 #include <java/lang/NullPointerException.h>
  54 #include <java/lang/OutOfMemoryError.h>
  55 #include <java/lang/System.h>
  56 #include <java/lang/VMThrowable.h>
  57 #include <java/lang/reflect/Modifier.h>
  58 #include <java/io/PrintStream.h>
  59 #include <java/lang/UnsatisfiedLinkError.h>
  60 #include <java/lang/VirtualMachineError.h>
  61 #include <gnu/gcj/runtime/VMClassLoader.h>
  62 #include <gnu/gcj/runtime/FinalizerThread.h>
  63 #include <gnu/gcj/runtime/FirstThread.h>
  64
  65 #ifdef USE_LTDL
  66 #include <ltdl.h>
  67 #endif
  68
  69 // We allocate a single OutOfMemoryError exception which we keep
  70 // around for use if we run out of memory.
  71 static java::lang::OutOfMemoryError *no_memory;
  72
  73 // Largest representable size_t.
  74 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  75
  76 static const char *no_properties[] = { NULL };
  77
  78 // Properties set at compile time.
  79 const char **_Jv_Compiler_Properties = no_properties;
  80
  81 // The JAR file to add to the beginning of java.class.path.
  82 const char *_Jv_Jar_Class_Path;
  83
  84 #ifndef DISABLE_GETENV_PROPERTIES
  85 // Property key/value pairs.
  86 property_pair *_Jv_Environment_Properties;
  87 #endif
  88
  89 // The name of this executable.
  90 static char *_Jv_execName;
  91
  92 // Stash the argv pointer to benefit native libraries that need it.
  93 const char **_Jv_argv;
  94 int _Jv_argc;
  95
  96 #ifdef ENABLE_JVMPI
  97 // Pointer to JVMPI notification functions.
  98 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
  99 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 100 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 101 #endif
 102 \f
 103
 104 extern "C" void _Jv_ThrowSignal (jthrowable) __attribute ((noreturn));
 105
 106 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 107 // this is declared extern in order that its name not be mangled, it
 108 // is not intended to be used outside this file.
 109 void
 110 _Jv_ThrowSignal (jthrowable throwable)
 111 {
 112   throwable->fillInStackTrace ();
 113   throw throwable;
 114 }
 115
 116 #ifdef HANDLE_SEGV
 117 static java::lang::NullPointerException *nullp;
 118
 119 SIGNAL_HANDLER (catch_segv)
 120 {
 121   MAKE_THROW_FRAME (nullp);
 122   _Jv_ThrowSignal (nullp);
 123 }
 124 #endif
 125
 126 static java::lang::ArithmeticException *arithexception;
 127
 128 #ifdef HANDLE_FPE
 129 SIGNAL_HANDLER (catch_fpe)
 130 {
 131 #ifdef HANDLE_DIVIDE_OVERFLOW
 132   HANDLE_DIVIDE_OVERFLOW;
 133 #else
 134   MAKE_THROW_FRAME (arithexception);
 135 #endif
 136   _Jv_ThrowSignal (arithexception);
 137 }
 138 #endif
 139
 140 \f
 141
 142 jboolean
 143 _Jv_equalUtf8Consts (Utf8Const* a, Utf8Const *b)
 144 {
 145   int len;
 146   _Jv_ushort *aptr, *bptr;
 147   if (a == b)
 148     return true;
 149   if (a->hash != b->hash)
 150     return false;
 151   len = a->length;
 152   if (b->length != len)
 153     return false;
 154   aptr = (_Jv_ushort *)a->data;
 155   bptr = (_Jv_ushort *)b->data;
 156   len = (len + 1) >> 1;
 157   while (--len >= 0)
 158     if (*aptr++ != *bptr++)
 159       return false;
 160   return true;
 161 }
 162
 163 /* True iff A is equal to STR.
 164    HASH is STR->hashCode().
 165 */
 166
 167 jboolean
 168 _Jv_equal (Utf8Const* a, jstring str, jint hash)
 169 {
 170   if (a->hash != (_Jv_ushort) hash)
 171     return false;
 172   jint len = str->length();
 173   jint i = 0;
 174   jchar *sptr = _Jv_GetStringChars (str);
 175   unsigned char* ptr = (unsigned char*) a->data;
 176   unsigned char* limit = ptr + a->length;
 177   for (;; i++, sptr++)
 178     {
 179       int ch = UTF8_GET (ptr, limit);
 180       if (i == len)
 181         return ch < 0;
 182       if (ch != *sptr)
 183         return false;
 184     }
 185   return true;
 186 }
 187
 188 /* Like _Jv_equal, but stop after N characters.  */
 189 jboolean
 190 _Jv_equaln (Utf8Const *a, jstring str, jint n)
 191 {
 192   jint len = str->length();
 193   jint i = 0;
 194   jchar *sptr = _Jv_GetStringChars (str);
 195   unsigned char* ptr = (unsigned char*) a->data;
 196   unsigned char* limit = ptr + a->length;
 197   for (; n-- > 0; i++, sptr++)
 198     {
 199       int ch = UTF8_GET (ptr, limit);
 200       if (i == len)
 201         return ch < 0;
 202       if (ch != *sptr)
 203         return false;
 204     }
 205   return true;
 206 }
 207
 208 /* Count the number of Unicode chars encoded in a given Ut8 string. */
 209 int
 210 _Jv_strLengthUtf8(char* str, int len)
 211 {
 212   unsigned char* ptr;
 213   unsigned char* limit;
 214   int str_length;
 215
 216   ptr = (unsigned char*) str;
 217   limit = ptr + len;
 218   str_length = 0;
 219   for (; ptr < limit; str_length++)
 220     {
 221       if (UTF8_GET (ptr, limit) < 0)
 222         return (-1);
 223     }
 224   return (str_length);
 225 }
 226
 227 /* Calculate a hash value for a string encoded in Utf8 format.
 228  * This returns the same hash value as specified or java.lang.String.hashCode.
 229  */
 230 static jint
 231 hashUtf8String (char* str, int len)
 232 {
 233   unsigned char* ptr = (unsigned char*) str;
 234   unsigned char* limit = ptr + len;
 235   jint hash = 0;
 236
 237   for (; ptr < limit;)
 238     {
 239       int ch = UTF8_GET (ptr, limit);
 240       /* Updated specification from
 241          http://www.javasoft.com/docs/books/jls/clarify.html. */
 242       hash = (31 * hash) + ch;
 243     }
 244   return hash;
 245 }
 246
 247 _Jv_Utf8Const *
 248 _Jv_makeUtf8Const (char* s, int len)
 249 {
 250   if (len < 0)
 251     len = strlen (s);
 252   Utf8Const* m = (Utf8Const*) _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 253   memcpy (m->data, s, len);
 254   m->data[len] = 0;
 255   m->length = len;
 256   m->hash = hashUtf8String (s, len) & 0xFFFF;
 257   return (m);
 258 }
 259
 260 _Jv_Utf8Const *
 261 _Jv_makeUtf8Const (jstring string)
 262 {
 263   jint hash = string->hashCode ();
 264   jint len = _Jv_GetStringUTFLength (string);
 265
 266   Utf8Const* m = (Utf8Const*)
 267     _Jv_AllocBytes (sizeof(Utf8Const) + len + 1);
 268
 269   m->hash = hash;
 270   m->length = len;
 271
 272   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 273   m->data[len] = 0;
 274
 275   return m;
 276 }
 277
 278 \f
 279
 280 #ifdef DEBUG
 281 void
 282 _Jv_Abort (const char *function, const char *file, int line,
 283            const char *message)
 284 #else
 285 void
 286 _Jv_Abort (const char *, const char *, int, const char *message)
 287 #endif
 288 {
 289 #ifdef DEBUG
 290   fprintf (stderr,
 291            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 292            message, function, file, line);
 293 #else
 294   fprintf (stderr, "libgcj failure: %s\n", message);
 295 #endif
 296   abort ();
 297 }
 298
 299 static void
 300 fail_on_finalization (jobject)
 301 {
 302   JvFail ("object was finalized");
 303 }
 304
 305 void
 306 _Jv_GCWatch (jobject obj)
 307 {
 308   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 309 }
 310
 311 void
 312 _Jv_ThrowBadArrayIndex(jint bad_index)
 313 {
 314   throw new java::lang::ArrayIndexOutOfBoundsException
 315     (java::lang::String::valueOf (bad_index));
 316 }
 317
 318 void
 319 _Jv_ThrowNullPointerException ()
 320 {
 321   throw new java::lang::NullPointerException;
 322 }
 323
 324 // Explicitly throw a no memory exception.
 325 // The collector calls this when it encounters an out-of-memory condition.
 326 void _Jv_ThrowNoMemory()
 327 {
 328   throw no_memory;
 329 }
 330
 331 #ifdef ENABLE_JVMPI
 332 static void
 333 jvmpi_notify_alloc(jclass klass, jint size, jobject obj)
 334 {
 335   // Service JVMPI allocation request.
 336   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 337     {
 338       JVMPI_Event event;
 339
 340       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 341       event.env_id = NULL;
 342       event.u.obj_alloc.arena_id = 0;
 343       event.u.obj_alloc.class_id = (jobjectID) klass;
 344       event.u.obj_alloc.is_array = 0;
 345       event.u.obj_alloc.size = size;
 346       event.u.obj_alloc.obj_id = (jobjectID) obj;
 347
 348       // FIXME:  This doesn't look right for the Boehm GC.  A GC may
 349       // already be in progress.  _Jv_DisableGC () doesn't wait for it.
 350       // More importantly, I don't see the need for disabling GC, since we
 351       // blatantly have a pointer to obj on our stack, ensuring that the
 352       // object can't be collected.  Even for a nonconservative collector,
 353       // it appears to me that this must be true, since we are about to
 354       // return obj. Isn't this whole approach way too intrusive for
 355       // a useful profiling interface?                  - HB
 356       _Jv_DisableGC ();
 357       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 358       _Jv_EnableGC ();
 359     }
 360 }
 361 #else /* !ENABLE_JVMPI */
 362 # define jvmpi_notify_alloc(klass,size,obj) /* do nothing */
 363 #endif
 364
 365 // Allocate a new object of class KLASS.  SIZE is the size of the object
 366 // to allocate.  You might think this is redundant, but it isn't; some
 367 // classes, such as String, aren't of fixed size.
 368 // First a version that assumes that we have no finalizer, and that
 369 // the class is already initialized.
 370 // If we know that JVMPI is disabled, this can be replaced by a direct call
 371 // to the allocator for the appropriate GC.
 372 jobject
 373 _Jv_AllocObjectNoInitNoFinalizer (jclass klass, jint size)
 374 {
 375   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 376   jvmpi_notify_alloc (klass, size, obj);
 377   return obj;
 378 }
 379
 380 // And now a version that initializes if necessary.
 381 jobject
 382 _Jv_AllocObjectNoFinalizer (jclass klass, jint size)
 383 {
 384   _Jv_InitClass (klass);
 385   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 386   jvmpi_notify_alloc (klass, size, obj);
 387   return obj;
 388 }
 389
 390 // And now the general version that registers a finalizer if necessary.
 391 jobject
 392 _Jv_AllocObject (jclass klass, jint size)
 393 {
 394   jobject obj = _Jv_AllocObjectNoFinalizer (klass, size);
 395
 396   // We assume that the compiler only generates calls to this routine
 397   // if there really is an interesting finalizer.
 398   // Unfortunately, we still have to the dynamic test, since there may
 399   // be cni calls to this routine.
 400   // Note that on IA64 get_finalizer() returns the starting address of the
 401   // function, not a function pointer.  Thus this still works.
 402   if (klass->vtable->get_finalizer ()
 403       != java::lang::Object::class$.vtable->get_finalizer ())
 404     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 405   return obj;
 406 }
 407
 408 // A version of the above that assumes the object contains no pointers,
 409 // and requires no finalization.  This can't happen if we need pointers
 410 // to locks.
 411 #ifdef JV_HASH_SYNCHRONIZATION
 412 jobject
 413 _Jv_AllocPtrFreeObject (jclass klass, jint size)
 414 {
 415   _Jv_InitClass (klass);
 416
 417   jobject obj = (jobject) _Jv_AllocPtrFreeObj (size, klass);
 418
 419 #ifdef ENABLE_JVMPI
 420   // Service JVMPI request.
 421
 422   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 423     {
 424       JVMPI_Event event;
 425
 426       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 427       event.env_id = NULL;
 428       event.u.obj_alloc.arena_id = 0;
 429       event.u.obj_alloc.class_id = (jobjectID) klass;
 430       event.u.obj_alloc.is_array = 0;
 431       event.u.obj_alloc.size = size;
 432       event.u.obj_alloc.obj_id = (jobjectID) obj;
 433
 434       _Jv_DisableGC ();
 435       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 436       _Jv_EnableGC ();
 437     }
 438 #endif
 439
 440   return obj;
 441 }
 442 #endif /* JV_HASH_SYNCHRONIZATION */
 443
 444
 445 // Allocate a new array of Java objects.  Each object is of type
 446 // `elementClass'.  `init' is used to initialize each slot in the
 447 // array.
 448 jobjectArray
 449 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 450 {
 451   if (__builtin_expect (count < 0, false))
 452     throw new java::lang::NegativeArraySizeException;
 453
 454   JvAssert (! elementClass->isPrimitive ());
 455
 456   // Ensure that elements pointer is properly aligned.
 457   jobjectArray obj = NULL;
 458   size_t size = (size_t) elements (obj);
 459   size += count * sizeof (jobject);
 460
 461   jclass klass = _Jv_GetArrayClass (elementClass,
 462                                     elementClass->getClassLoaderInternal());
 463
 464   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 465   // Cast away const.
 466   jsize *lp = const_cast<jsize *> (&obj->length);
 467   *lp = count;
 468   // We know the allocator returns zeroed memory.  So don't bother
 469   // zeroing it again.
 470   if (init)
 471     {
 472       jobject *ptr = elements(obj);
 473       while (--count >= 0)
 474         *ptr++ = init;
 475     }
 476   return obj;
 477 }
 478
 479 // Allocate a new array of primitives.  ELTYPE is the type of the
 480 // element, COUNT is the size of the array.
 481 jobject
 482 _Jv_NewPrimArray (jclass eltype, jint count)
 483 {
 484   int elsize = eltype->size();
 485   if (__builtin_expect (count < 0, false))
 486     throw new java::lang::NegativeArraySizeException;
 487
 488   JvAssert (eltype->isPrimitive ());
 489   jobject dummy = NULL;
 490   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 491
 492   // Check for overflow.
 493   if (__builtin_expect ((size_t) count >
 494                         (SIZE_T_MAX - size) / elsize, false))
 495     throw no_memory;
 496
 497   jclass klass = _Jv_GetArrayClass (eltype, 0);
 498
 499 # ifdef JV_HASH_SYNCHRONIZATION
 500   // Since the vtable is always statically allocated,
 501   // these are completely pointerfree!  Make sure the GC doesn't touch them.
 502   __JArray *arr =
 503     (__JArray*) _Jv_AllocPtrFreeObj (size + elsize * count, klass);
 504   memset((char *)arr + size, 0, elsize * count);
 505 # else
 506   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 507   // Note that we assume we are given zeroed memory by the allocator.
 508 # endif
 509   // Cast away const.
 510   jsize *lp = const_cast<jsize *> (&arr->length);
 511   *lp = count;
 512
 513   return arr;
 514 }
 515
 516 jobject
 517 _Jv_NewArray (jint type, jint size)
 518 {
 519   switch (type)
 520     {
 521       case  4:  return JvNewBooleanArray (size);
 522       case  5:  return JvNewCharArray (size);
 523       case  6:  return JvNewFloatArray (size);
 524       case  7:  return JvNewDoubleArray (size);
 525       case  8:  return JvNewByteArray (size);
 526       case  9:  return JvNewShortArray (size);
 527       case 10:  return JvNewIntArray (size);
 528       case 11:  return JvNewLongArray (size);
 529     }
 530   throw new java::lang::InternalError
 531     (JvNewStringLatin1 ("invalid type code in _Jv_NewArray"));
 532 }
 533
 534 // Allocate a possibly multi-dimensional array but don't check that
 535 // any array length is <0.
 536 static jobject
 537 _Jv_NewMultiArrayUnchecked (jclass type, jint dimensions, jint *sizes)
 538 {
 539   JvAssert (type->isArray());
 540   jclass element_type = type->getComponentType();
 541   jobject result;
 542   if (element_type->isPrimitive())
 543     result = _Jv_NewPrimArray (element_type, sizes[0]);
 544   else
 545     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 546
 547   if (dimensions > 1)
 548     {
 549       JvAssert (! element_type->isPrimitive());
 550       JvAssert (element_type->isArray());
 551       jobject *contents = elements ((jobjectArray) result);
 552       for (int i = 0; i < sizes[0]; ++i)
 553         contents[i] = _Jv_NewMultiArrayUnchecked (element_type, dimensions - 1,
 554                                                   sizes + 1);
 555     }
 556
 557   return result;
 558 }
 559
 560 jobject
 561 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 562 {
 563   for (int i = 0; i < dimensions; ++i)
 564     if (sizes[i] < 0)
 565       throw new java::lang::NegativeArraySizeException;
 566
 567   return _Jv_NewMultiArrayUnchecked (type, dimensions, sizes);
 568 }
 569
 570 jobject
 571 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 572 {
 573   va_list args;
 574   jint sizes[dimensions];
 575   va_start (args, dimensions);
 576   for (int i = 0; i < dimensions; ++i)
 577     {
 578       jint size = va_arg (args, jint);
 579       if (size < 0)
 580         throw new java::lang::NegativeArraySizeException;
 581       sizes[i] = size;
 582     }
 583   va_end (args);
 584
 585   return _Jv_NewMultiArrayUnchecked (array_type, dimensions, sizes);
 586 }
 587
 588 \f
 589
 590 // Ensure 8-byte alignment, for hash synchronization.
 591 #define DECLARE_PRIM_TYPE(NAME)                 \
 592   _Jv_ArrayVTable _Jv_##NAME##VTable;           \
 593   java::lang::Class _Jv_##NAME##Class __attribute__ ((aligned (8)));
 594
 595 DECLARE_PRIM_TYPE(byte)
 596 DECLARE_PRIM_TYPE(short)
 597 DECLARE_PRIM_TYPE(int)
 598 DECLARE_PRIM_TYPE(long)
 599 DECLARE_PRIM_TYPE(boolean)
 600 DECLARE_PRIM_TYPE(char)
 601 DECLARE_PRIM_TYPE(float)
 602 DECLARE_PRIM_TYPE(double)
 603 DECLARE_PRIM_TYPE(void)
 604
 605 void
 606 _Jv_InitPrimClass (jclass cl, char *cname, char sig, int len,
 607                    _Jv_ArrayVTable *array_vtable)
 608 {
 609   using namespace java::lang::reflect;
 610
 611   _Jv_InitNewClassFields (cl);
 612
 613   // We must set the vtable for the class; the Java constructor
 614   // doesn't do this.
 615   (*(_Jv_VTable **) cl) = java::lang::Class::class$.vtable;
 616
 617   // Initialize the fields we care about.  We do this in the same
 618   // order they are declared in Class.h.
 619   cl->name = _Jv_makeUtf8Const ((char *) cname, -1);
 620   cl->accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 621   cl->method_count = sig;
 622   cl->size_in_bytes = len;
 623   cl->vtable = JV_PRIMITIVE_VTABLE;
 624   cl->state = JV_STATE_DONE;
 625   cl->depth = -1;
 626   if (sig != 'V')
 627     _Jv_NewArrayClass (cl, NULL, (_Jv_VTable *) array_vtable);
 628 }
 629
 630 jclass
 631 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 632 {
 633   switch (*sig)
 634     {
 635     case 'B':
 636       return JvPrimClass (byte);
 637     case 'S':
 638       return JvPrimClass (short);
 639     case 'I':
 640       return JvPrimClass (int);
 641     case 'J':
 642       return JvPrimClass (long);
 643     case 'Z':
 644       return JvPrimClass (boolean);
 645     case 'C':
 646       return JvPrimClass (char);
 647     case 'F':
 648       return JvPrimClass (float);
 649     case 'D':
 650       return JvPrimClass (double);
 651     case 'V':
 652       return JvPrimClass (void);
 653     case 'L':
 654       {
 655         int i;
 656         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 657           ;
 658         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 659         return _Jv_FindClass (name, loader);
 660       }
 661     case '[':
 662       {
 663         jclass klass = _Jv_FindClassFromSignature (&sig[1], loader);
 664         if (! klass)
 665           return NULL;
 666         return _Jv_GetArrayClass (klass, loader);
 667       }
 668     }
 669
 670   return NULL;                  // Placate compiler.
 671 }
 672
 673 \f
 674
 675 JArray<jstring> *
 676 JvConvertArgv (int argc, const char **argv)
 677 {
 678   if (argc < 0)
 679     argc = 0;
 680   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 681   jobject *ptr = elements(ar);
 682   jbyteArray bytes = NULL;
 683   for (int i = 0;  i < argc;  i++)
 684     {
 685       const char *arg = argv[i];
 686       int len = strlen (arg);
 687       if (bytes == NULL || bytes->length < len)
 688         bytes = JvNewByteArray (len);
 689       jbyte *bytePtr = elements (bytes);
 690       // We assume jbyte == char.
 691       memcpy (bytePtr, arg, len);
 692
 693       // Now convert using the default encoding.
 694       *ptr++ = new java::lang::String (bytes, 0, len);
 695     }
 696   return (JArray<jstring>*) ar;
 697 }
 698
 699 // FIXME: These variables are static so that they will be
 700 // automatically scanned by the Boehm collector.  This is needed
 701 // because with qthreads the collector won't scan the initial stack --
 702 // it will only scan the qthreads stacks.
 703
 704 // Command line arguments.
 705 static JArray<jstring> *arg_vec;
 706
 707 // The primary thread.
 708 static java::lang::Thread *main_thread;
 709
 710 char *
 711 _Jv_ThisExecutable (void)
 712 {
 713   return _Jv_execName;
 714 }
 715
 716 void
 717 _Jv_ThisExecutable (const char *name)
 718 {
 719   if (name)
 720     {
 721       _Jv_execName = (char *) _Jv_Malloc (strlen (name) + 1);
 722       strcpy (_Jv_execName, name);
 723     }
 724 }
 725
 726 #ifndef DISABLE_GETENV_PROPERTIES
 727
 728 static char *
 729 next_property_key (char *s, size_t *length)
 730 {
 731   size_t l = 0;
 732
 733   JvAssert (s);
 734
 735   // Skip over whitespace
 736   while (isspace (*s))
 737     s++;
 738
 739   // If we've reached the end, return NULL.  Also return NULL if for
 740   // some reason we've come across a malformed property string.
 741   if (*s == 0
 742       || *s == ':'
 743       || *s == '=')
 744     return NULL;
 745
 746   // Determine the length of the property key.
 747   while (s[l] != 0
 748          && ! isspace (s[l])
 749          && s[l] != ':'
 750          && s[l] != '=')
 751     {
 752       if (s[l] == '\\'
 753           && s[l+1] != 0)
 754         l++;
 755       l++;
 756     }
 757
 758   *length = l;
 759
 760   return s;
 761 }
 762
 763 static char *
 764 next_property_value (char *s, size_t *length)
 765 {
 766   size_t l = 0;
 767
 768   JvAssert (s);
 769
 770   while (isspace (*s))
 771     s++;
 772
 773   if (*s == ':'
 774       || *s == '=')
 775     s++;
 776
 777   while (isspace (*s))
 778     s++;
 779
 780   // If we've reached the end, return NULL.
 781   if (*s == 0)
 782     return NULL;
 783
 784   // Determine the length of the property value.
 785   while (s[l] != 0
 786          && ! isspace (s[l])
 787          && s[l] != ':'
 788          && s[l] != '=')
 789     {
 790       if (s[l] == '\\'
 791           && s[l+1] != 0)
 792         l += 2;
 793       else
 794         l++;
 795     }
 796
 797   *length = l;
 798
 799   return s;
 800 }
 801
 802 static void
 803 process_gcj_properties ()
 804 {
 805   char *props = getenv("GCJ_PROPERTIES");
 806   char *p = props;
 807   size_t length;
 808   size_t property_count = 0;
 809
 810   if (NULL == props)
 811     return;
 812
 813   // Whip through props quickly in order to count the number of
 814   // property values.
 815   while (p && (p = next_property_key (p, &length)))
 816     {
 817       // Skip to the end of the key
 818       p += length;
 819
 820       p = next_property_value (p, &length);
 821       if (p)
 822         p += length;
 823
 824       property_count++;
 825     }
 826
 827   // Allocate an array of property value/key pairs.
 828   _Jv_Environment_Properties =
 829     (property_pair *) malloc (sizeof(property_pair)
 830                               * (property_count + 1));
 831
 832   // Go through the properties again, initializing _Jv_Properties
 833   // along the way.
 834   p = props;
 835   property_count = 0;
 836   while (p && (p = next_property_key (p, &length)))
 837     {
 838       _Jv_Environment_Properties[property_count].key = p;
 839       _Jv_Environment_Properties[property_count].key_length = length;
 840
 841       // Skip to the end of the key
 842       p += length;
 843
 844       p = next_property_value (p, &length);
 845
 846       _Jv_Environment_Properties[property_count].value = p;
 847       _Jv_Environment_Properties[property_count].value_length = length;
 848
 849       if (p)
 850         p += length;
 851
 852       property_count++;
 853     }
 854   memset ((void *) &_Jv_Environment_Properties[property_count],
 855           0, sizeof (property_pair));
 856   {
 857     size_t i = 0;
 858
 859     // Null terminate the strings.
 860     while (_Jv_Environment_Properties[i].key)
 861       {
 862         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 863         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 864       }
 865   }
 866 }
 867 #endif // DISABLE_GETENV_PROPERTIES
 868
 869 namespace gcj
 870 {
 871   _Jv_Utf8Const *void_signature;
 872   _Jv_Utf8Const *clinit_name;
 873   _Jv_Utf8Const *init_name;
 874   _Jv_Utf8Const *finit_name;
 875
 876   bool runtimeInitialized = false;
 877 }
 878
 879 jint
 880 _Jv_CreateJavaVM (void* /*vm_args*/)
 881 {
 882   using namespace gcj;
 883
 884   if (runtimeInitialized)
 885     return -1;
 886
 887   runtimeInitialized = true;
 888
 889   PROCESS_GCJ_PROPERTIES;
 890
 891   _Jv_InitThreads ();
 892   _Jv_InitGC ();
 893   _Jv_InitializeSyncMutex ();
 894
 895   /* Initialize Utf8 constants declared in jvm.h. */
 896   void_signature = _Jv_makeUtf8Const ("()V", 3);
 897   clinit_name = _Jv_makeUtf8Const ("<clinit>", 8);
 898   init_name = _Jv_makeUtf8Const ("<init>", 6);
 899   finit_name = _Jv_makeUtf8Const ("finit$", 6);
 900
 901   /* Initialize built-in classes to represent primitive TYPEs. */
 902   _Jv_InitPrimClass (&_Jv_byteClass,    "byte",    'B', 1, &_Jv_byteVTable);
 903   _Jv_InitPrimClass (&_Jv_shortClass,   "short",   'S', 2, &_Jv_shortVTable);
 904   _Jv_InitPrimClass (&_Jv_intClass,     "int",     'I', 4, &_Jv_intVTable);
 905   _Jv_InitPrimClass (&_Jv_longClass,    "long",    'J', 8, &_Jv_longVTable);
 906   _Jv_InitPrimClass (&_Jv_booleanClass, "boolean", 'Z', 1, &_Jv_booleanVTable);
 907   _Jv_InitPrimClass (&_Jv_charClass,    "char",    'C', 2, &_Jv_charVTable);
 908   _Jv_InitPrimClass (&_Jv_floatClass,   "float",   'F', 4, &_Jv_floatVTable);
 909   _Jv_InitPrimClass (&_Jv_doubleClass,  "double",  'D', 8, &_Jv_doubleVTable);
 910   _Jv_InitPrimClass (&_Jv_voidClass,    "void",    'V', 0, &_Jv_voidVTable);
 911
 912   // Turn stack trace generation off while creating exception objects.
 913   _Jv_InitClass (&java::lang::VMThrowable::class$);
 914   java::lang::VMThrowable::trace_enabled = 0;
 915
 916   INIT_SEGV;
 917 #ifdef HANDLE_FPE
 918   INIT_FPE;
 919 #else
 920   arithexception = new java::lang::ArithmeticException
 921     (JvNewStringLatin1 ("/ by zero"));
 922 #endif
 923
 924   no_memory = new java::lang::OutOfMemoryError;
 925
 926   java::lang::VMThrowable::trace_enabled = 1;
 927
 928 #ifdef USE_LTDL
 929   LTDL_SET_PRELOADED_SYMBOLS ();
 930 #endif
 931
 932   _Jv_platform_initialize ();
 933
 934   _Jv_JNI_Init ();
 935
 936   _Jv_GCInitializeFinalizers (&::gnu::gcj::runtime::FinalizerThread::finalizerReady);
 937
 938   // Start the GC finalizer thread.  A VirtualMachineError can be
 939   // thrown by the runtime if, say, threads aren't available.  In this
 940   // case finalizers simply won't run.
 941   try
 942     {
 943       using namespace gnu::gcj::runtime;
 944       FinalizerThread *ft = new FinalizerThread ();
 945       ft->start ();
 946     }
 947   catch (java::lang::VirtualMachineError *ignore)
 948     {
 949     }
 950
 951   return 0;
 952 }
 953
 954 void
 955 _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 956              bool is_jar)
 957 {
 958   _Jv_argv = argv;
 959   _Jv_argc = argc;
 960
 961   java::lang::Runtime *runtime = NULL;
 962
 963
 964 #ifdef DISABLE_MAIN_ARGS
 965   _Jv_ThisExecutable ("[Embedded App]");
 966 #else
 967 #ifdef HAVE_PROC_SELF_EXE
 968   char exec_name[20];
 969   sprintf (exec_name, "/proc/%d/exe", getpid ());
 970   _Jv_ThisExecutable (exec_name);
 971 #else
 972   _Jv_ThisExecutable (argv[0]);
 973 #endif /* HAVE_PROC_SELF_EXE */
 974 #endif /* DISABLE_MAIN_ARGS */
 975
 976   try
 977     {
 978       // Set this very early so that it is seen when java.lang.System
 979       // is initialized.
 980       if (is_jar)
 981         _Jv_Jar_Class_Path = strdup (name);
 982       _Jv_CreateJavaVM (NULL);
 983
 984       // Get the Runtime here.  We want to initialize it before searching
 985       // for `main'; that way it will be set up if `main' is a JNI method.
 986       runtime = java::lang::Runtime::getRuntime ();
 987
 988 #ifdef DISABLE_MAIN_ARGS
 989       arg_vec = JvConvertArgv (0, 0);
 990 #else
 991       arg_vec = JvConvertArgv (argc - 1, argv + 1);
 992 #endif
 993
 994       using namespace gnu::gcj::runtime;
 995       if (klass)
 996         main_thread = new FirstThread (klass, arg_vec);
 997       else
 998         main_thread = new FirstThread (JvNewStringLatin1 (name),
 999                                        arg_vec, is_jar);
1000     }
1001   catch (java::lang::Throwable *t)
1002     {
1003       java::lang::System::err->println (JvNewStringLatin1
1004         ("Exception during runtime initialization"));
1005       t->printStackTrace();
1006       runtime->exit (1);
1007     }
1008
1009   _Jv_AttachCurrentThread (main_thread);
1010   _Jv_ThreadRun (main_thread);
1011   _Jv_ThreadWait ();
1012
1013   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
1014   runtime->exit (status);
1015 }
1016
1017 void
1018 JvRunMain (jclass klass, int argc, const char **argv)
1019 {
1020   _Jv_RunMain (klass, NULL, argc, argv, false);
1021 }
1022
1023 \f
1024
1025 // Parse a string and return a heap size.
1026 static size_t
1027 parse_heap_size (const char *spec)
1028 {
1029   char *end;
1030   unsigned long val = strtoul (spec, &end, 10);
1031   if (*end == 'k' || *end == 'K')
1032     val *= 1024;
1033   else if (*end == 'm' || *end == 'M')
1034     val *= 1048576;
1035   return (size_t) val;
1036 }
1037
1038 // Set the initial heap size.  This might be ignored by the GC layer.
1039 // This must be called before _Jv_RunMain.
1040 void
1041 _Jv_SetInitialHeapSize (const char *arg)
1042 {
1043   size_t size = parse_heap_size (arg);
1044   _Jv_GCSetInitialHeapSize (size);
1045 }
1046
1047 // Set the maximum heap size.  This might be ignored by the GC layer.
1048 // This must be called before _Jv_RunMain.
1049 void
1050 _Jv_SetMaximumHeapSize (const char *arg)
1051 {
1052   size_t size = parse_heap_size (arg);
1053   _Jv_GCSetMaximumHeapSize (size);
1054 }
1055
1056 \f
1057
1058 void *
1059 _Jv_Malloc (jsize size)
1060 {
1061   if (__builtin_expect (size == 0, false))
1062     size = 1;
1063   void *ptr = malloc ((size_t) size);
1064   if (__builtin_expect (ptr == NULL, false))
1065     throw no_memory;
1066   return ptr;
1067 }
1068
1069 void *
1070 _Jv_Realloc (void *ptr, jsize size)
1071 {
1072   if (__builtin_expect (size == 0, false))
1073     size = 1;
1074   ptr = realloc (ptr, (size_t) size);
1075   if (__builtin_expect (ptr == NULL, false))
1076     throw no_memory;
1077   return ptr;
1078 }
1079
1080 void *
1081 _Jv_MallocUnchecked (jsize size)
1082 {
1083   if (__builtin_expect (size == 0, false))
1084     size = 1;
1085   return malloc ((size_t) size);
1086 }
1087
1088 void
1089 _Jv_Free (void* ptr)
1090 {
1091   return free (ptr);
1092 }
1093
1094 \f
1095
1096 // In theory, these routines can be #ifdef'd away on machines which
1097 // support divide overflow signals.  However, we never know if some
1098 // code might have been compiled with "-fuse-divide-subroutine", so we
1099 // always include them in libgcj.
1100
1101 jint
1102 _Jv_divI (jint dividend, jint divisor)
1103 {
1104   if (__builtin_expect (divisor == 0, false))
1105     _Jv_ThrowSignal (arithexception);
1106
1107   if (dividend == (jint) 0x80000000L && divisor == -1)
1108     return dividend;
1109
1110   return dividend / divisor;
1111 }
1112
1113 jint
1114 _Jv_remI (jint dividend, jint divisor)
1115 {
1116   if (__builtin_expect (divisor == 0, false))
1117     _Jv_ThrowSignal (arithexception);
1118
1119   if (dividend == (jint) 0x80000000L && divisor == -1)
1120     return 0;
1121
1122   return dividend % divisor;
1123 }
1124
1125 jlong
1126 _Jv_divJ (jlong dividend, jlong divisor)
1127 {
1128   if (__builtin_expect (divisor == 0, false))
1129     _Jv_ThrowSignal (arithexception);
1130
1131   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1132     return dividend;
1133
1134   return dividend / divisor;
1135 }
1136
1137 jlong
1138 _Jv_remJ (jlong dividend, jlong divisor)
1139 {
1140   if (__builtin_expect (divisor == 0, false))
1141     _Jv_ThrowSignal (arithexception);
1142
1143   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1144     return 0;
1145
1146   return dividend % divisor;
1147 }