libjava/prims.cc

   1 // prims.cc - Code for core of runtime environment.
   2
   3 /* Copyright (C) 1998, 1999, 2000  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <config.h>
  12
  13 #ifdef USE_WIN32_SIGNALLING
  14 #include <windows.h>
  15 #endif /* USE_WIN32_SIGNALLING */
  16
  17 #ifdef USE_WINSOCK
  18 #undef __INSIDE_CYGWIN__
  19 #include <winsock.h>
  20 #endif /* USE_WINSOCK */
  21
  22 #include <stdlib.h>
  23 #include <stdarg.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <signal.h>
  27
  28 #ifdef HAVE_UNISTD_H
  29 #include <unistd.h>
  30 #endif
  31
  32 #include <gcj/cni.h>
  33 #include <jvm.h>
  34 #include <java-signal.h>
  35 #include <java-threads.h>
  36
  37 #ifdef ENABLE_JVMPI
  38 #include <jvmpi.h>
  39 #endif
  40
  41 #ifndef DISABLE_GETENV_PROPERTIES
  42 #include <ctype.h>
  43 #include <java-props.h>
  44 #define PROCESS_GCJ_PROPERTIES process_gcj_properties()
  45 #else
  46 #define PROCESS_GCJ_PROPERTIES
  47 #endif // DISABLE_GETENV_PROPERTIES
  48
  49 #include <java/lang/Class.h>
  50 #include <java/lang/ClassLoader.h>
  51 #include <java/lang/Runtime.h>
  52 #include <java/lang/String.h>
  53 #include <java/lang/Thread.h>
  54 #include <java/lang/ThreadGroup.h>
  55 #include <gnu/gcj/runtime/FirstThread.h>
  56 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  57 #include <java/lang/ArithmeticException.h>
  58 #include <java/lang/ClassFormatError.h>
  59 #include <java/lang/NegativeArraySizeException.h>
  60 #include <java/lang/NullPointerException.h>
  61 #include <java/lang/OutOfMemoryError.h>
  62 #include <java/lang/System.h>
  63 #include <java/lang/reflect/Modifier.h>
  64 #include <java/io/PrintStream.h>
  65
  66 #ifdef USE_LTDL
  67 #include <ltdl.h>
  68 #endif
  69
  70 // We allocate a single OutOfMemoryError exception which we keep
  71 // around for use if we run out of memory.
  72 static java::lang::OutOfMemoryError *no_memory;
  73
  74 // Largest representable size_t.
  75 #define SIZE_T_MAX ((size_t) (~ (size_t) 0))
  76
  77 // Properties set at compile time.
  78 const char **_Jv_Compiler_Properties;
  79
  80 // The JAR file to add to the beginning of java.class.path.
  81 const char *_Jv_Jar_Class_Path;
  82
  83 #ifndef DISABLE_GETENV_PROPERTIES
  84 // Property key/value pairs.
  85 property_pair *_Jv_Environment_Properties;
  86 #endif
  87
  88 // The name of this executable.
  89 static char * _Jv_execName;
  90
  91 // Stash the argv pointer to benefit native libraries that need it.
  92 const char **_Jv_argv;
  93 int _Jv_argc;
  94
  95 #ifdef ENABLE_JVMPI
  96 // Pointer to JVMPI notification functions.
  97 void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
  98 void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
  99 void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 100 #endif
 101 \f
 102
 103 extern "C" void _Jv_ThrowSignal (void *) __attribute ((noreturn));
 104
 105 // Just like _Jv_Throw, but fill in the stack trace first.  Although
 106 // this is declared extern in order that its name not be mangled, it
 107 // is not intended to be used outside this file.
 108 void
 109 _Jv_ThrowSignal (void *e)
 110 {
 111   java::lang::Throwable *throwable = (java::lang::Throwable *)e;
 112   throwable->fillInStackTrace ();
 113   _Jv_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     if (UTF8_GET (ptr, limit) < 0) {
 221       return (-1);
 222     }
 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   if (! m)
 254     JvThrow (no_memory);
 255   memcpy (m->data, s, len);
 256   m->data[len] = 0;
 257   m->length = len;
 258   m->hash = hashUtf8String (s, len) & 0xFFFF;
 259   return (m);
 260 }
 261
 262 _Jv_Utf8Const *
 263 _Jv_makeUtf8Const (jstring string)
 264 {
 265   jint hash = string->hashCode ();
 266   jint len = _Jv_GetStringUTFLength (string);
 267
 268   Utf8Const* m = (Utf8Const*)
 269     _Jv_AllocBytesChecked (sizeof(Utf8Const) + len + 1);
 270
 271   m->hash = hash;
 272   m->length = len;
 273
 274   _Jv_GetStringUTFRegion (string, 0, string->length (), m->data);
 275   m->data[len] = 0;
 276
 277   return m;
 278 }
 279
 280 \f
 281
 282 #ifdef DEBUG
 283 void
 284 _Jv_Abort (const char *function, const char *file, int line,
 285            const char *message)
 286 #else
 287 void
 288 _Jv_Abort (const char *, const char *, int, const char *message)
 289 #endif
 290 {
 291 #ifdef DEBUG
 292   fprintf (stderr,
 293            "libgcj failure: %s\n   in function %s, file %s, line %d\n",
 294            message, function, file, line);
 295 #else
 296   java::io::PrintStream *err = java::lang::System::err;
 297   err->print(JvNewStringLatin1 ("libgcj failure: "));
 298   err->println(JvNewStringLatin1 (message));
 299   err->flush();
 300 #endif
 301   abort ();
 302 }
 303
 304 static void
 305 fail_on_finalization (jobject)
 306 {
 307   JvFail ("object was finalized");
 308 }
 309
 310 void
 311 _Jv_GCWatch (jobject obj)
 312 {
 313   _Jv_RegisterFinalizer (obj, fail_on_finalization);
 314 }
 315
 316 void
 317 _Jv_ThrowBadArrayIndex(jint bad_index)
 318 {
 319   JvThrow (new java::lang::ArrayIndexOutOfBoundsException
 320            (java::lang::String::valueOf(bad_index)));
 321 }
 322
 323 void
 324 _Jv_ThrowNullPointerException ()
 325 {
 326   throw new java::lang::NullPointerException ();
 327 }
 328
 329 // Allocate some unscanned memory and throw an exception if no memory.
 330 void *
 331 _Jv_AllocBytesChecked (jsize size)
 332 {
 333   void *r = _Jv_AllocBytes (size);
 334   if (! r)
 335     _Jv_Throw (no_memory);
 336   return r;
 337 }
 338
 339 // Allocate a new object of class KLASS.  SIZE is the size of the object
 340 // to allocate.  You might think this is redundant, but it isn't; some
 341 // classes, such as String, aren't of fixed size.
 342 jobject
 343 _Jv_AllocObject (jclass klass, jint size)
 344 {
 345   _Jv_InitClass (klass);
 346
 347   jobject obj = (jobject) _Jv_AllocObj (size, klass);
 348   if (__builtin_expect (! obj, false))
 349     JvThrow (no_memory);
 350
 351   // If this class has inherited finalize from Object, then don't
 352   // bother registering a finalizer.  We know that finalize() is the
 353   // very first method after the dummy entry.  If this turns out to be
 354   // unreliable, a more robust implementation can be written.  Such an
 355   // implementation would look for Object.finalize in Object's method
 356   // table at startup, and then use that information to find the
 357   // appropriate index in the method vector.
 358   if (klass->vtable->get_finalizer()
 359       != java::lang::Object::class$.vtable->get_finalizer())
 360     _Jv_RegisterFinalizer (obj, _Jv_FinalizeObject);
 361
 362 #ifdef ENABLE_JVMPI
 363   // Service JVMPI request.
 364
 365   if (__builtin_expect (_Jv_JVMPI_Notify_OBJECT_ALLOC != 0, false))
 366     {
 367       JVMPI_Event event;
 368
 369       event.event_type = JVMPI_EVENT_OBJECT_ALLOC;
 370       event.env_id = NULL;
 371       event.u.obj_alloc.arena_id = 0;
 372       event.u.obj_alloc.class_id = (jobjectID) klass;
 373       event.u.obj_alloc.is_array = 0;
 374       event.u.obj_alloc.size = size;
 375       event.u.obj_alloc.obj_id = (jobjectID) obj;
 376
 377       _Jv_DisableGC ();
 378       (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (&event);
 379       _Jv_EnableGC ();
 380     }
 381 #endif
 382
 383   return obj;
 384 }
 385
 386 // Allocate a new array of Java objects.  Each object is of type
 387 // `elementClass'.  `init' is used to initialize each slot in the
 388 // array.
 389 jobjectArray
 390 _Jv_NewObjectArray (jsize count, jclass elementClass, jobject init)
 391 {
 392   if (__builtin_expect (count < 0, false))
 393     JvThrow (new java::lang::NegativeArraySizeException);
 394
 395   JvAssert (! elementClass->isPrimitive ());
 396
 397   // Ensure that elements pointer is properly aligned.
 398   jobjectArray obj = NULL;
 399   size_t size = (size_t) elements (obj);
 400   size += count * sizeof (jobject);
 401
 402   // FIXME: second argument should be "current loader"
 403   jclass klass = _Jv_GetArrayClass (elementClass, 0);
 404
 405   obj = (jobjectArray) _Jv_AllocArray (size, klass);
 406   if (__builtin_expect (! obj, false))
 407     JvThrow (no_memory);
 408   // Cast away const.
 409   jsize *lp = const_cast<jsize *> (&obj->length);
 410   *lp = count;
 411   // We know the allocator returns zeroed memory.  So don't bother
 412   // zeroing it again.
 413   if (init)
 414     {
 415       jobject *ptr = elements(obj);
 416       while (--count >= 0)
 417         *ptr++ = init;
 418     }
 419   return obj;
 420 }
 421
 422 // Allocate a new array of primitives.  ELTYPE is the type of the
 423 // element, COUNT is the size of the array.
 424 jobject
 425 _Jv_NewPrimArray (jclass eltype, jint count)
 426 {
 427   int elsize = eltype->size();
 428   if (__builtin_expect (count < 0, false))
 429     JvThrow (new java::lang::NegativeArraySizeException ());
 430
 431   JvAssert (eltype->isPrimitive ());
 432   jobject dummy = NULL;
 433   size_t size = (size_t) _Jv_GetArrayElementFromElementType (dummy, eltype);
 434
 435   // Check for overflow.
 436   if (__builtin_expect ((size_t) count >
 437                         (SIZE_T_MAX - size) / elsize, false))
 438     JvThrow (no_memory);
 439
 440   jclass klass = _Jv_GetArrayClass (eltype, 0);
 441
 442   __JArray *arr = (__JArray*) _Jv_AllocObj (size + elsize * count, klass);
 443   if (__builtin_expect (! arr, false))
 444     JvThrow (no_memory);
 445   // Cast away const.
 446   jsize *lp = const_cast<jsize *> (&arr->length);
 447   *lp = count;
 448   // Note that we assume we are given zeroed memory by the allocator.
 449
 450   return arr;
 451 }
 452
 453 jobject
 454 _Jv_NewArray (jint type, jint size)
 455 {
 456   switch (type)
 457     {
 458       case  4:  return JvNewBooleanArray (size);
 459       case  5:  return JvNewCharArray (size);
 460       case  6:  return JvNewFloatArray (size);
 461       case  7:  return JvNewDoubleArray (size);
 462       case  8:  return JvNewByteArray (size);
 463       case  9:  return JvNewShortArray (size);
 464       case 10:  return JvNewIntArray (size);
 465       case 11:  return JvNewLongArray (size);
 466     }
 467   JvFail ("newarray - bad type code");
 468   return NULL;                  // Placate compiler.
 469 }
 470
 471 jobject
 472 _Jv_NewMultiArray (jclass type, jint dimensions, jint *sizes)
 473 {
 474   JvAssert (type->isArray());
 475   jclass element_type = type->getComponentType();
 476   jobject result;
 477   if (element_type->isPrimitive())
 478     result = _Jv_NewPrimArray (element_type, sizes[0]);
 479   else
 480     result = _Jv_NewObjectArray (sizes[0], element_type, NULL);
 481
 482   if (dimensions > 1)
 483     {
 484       JvAssert (! element_type->isPrimitive());
 485       JvAssert (element_type->isArray());
 486       jobject *contents = elements ((jobjectArray) result);
 487       for (int i = 0; i < sizes[0]; ++i)
 488         contents[i] = _Jv_NewMultiArray (element_type, dimensions - 1,
 489                                          sizes + 1);
 490     }
 491
 492   return result;
 493 }
 494
 495 jobject
 496 _Jv_NewMultiArray (jclass array_type, jint dimensions, ...)
 497 {
 498   va_list args;
 499   jint sizes[dimensions];
 500   va_start (args, dimensions);
 501   for (int i = 0; i < dimensions; ++i)
 502     {
 503       jint size = va_arg (args, jint);
 504       sizes[i] = size;
 505     }
 506   va_end (args);
 507
 508   return _Jv_NewMultiArray (array_type, dimensions, sizes);
 509 }
 510
 511 \f
 512
 513 class _Jv_PrimClass : public java::lang::Class
 514 {
 515 public:
 516   // FIXME: calling convention is weird.  If we use the natural types
 517   // then the compiler will complain because they aren't Java types.
 518   _Jv_PrimClass (jobject cname, jbyte sig, jint len, jobject array_vtable)
 519     {
 520       using namespace java::lang::reflect;
 521
 522       // We must initialize every field of the class.  We do this in
 523       // the same order they are declared in Class.h.
 524       next = NULL;
 525       name = _Jv_makeUtf8Const ((char *) cname, -1);
 526       accflags = Modifier::PUBLIC | Modifier::FINAL | Modifier::ABSTRACT;
 527       superclass = NULL;
 528       constants.size = 0;
 529       constants.tags = NULL;
 530       constants.data = NULL;
 531       methods = NULL;
 532       method_count = sig;
 533       vtable_method_count = 0;
 534       fields = NULL;
 535       size_in_bytes = len;
 536       field_count = 0;
 537       static_field_count = 0;
 538       vtable = JV_PRIMITIVE_VTABLE;
 539       interfaces = NULL;
 540       loader = NULL;
 541       interface_count = 0;
 542       state = JV_STATE_DONE;
 543       thread = NULL;
 544       depth = -1;
 545       ancestors = NULL;
 546       idt = NULL;
 547
 548       // Note that we have to set `methods' to NULL.
 549       if (sig != 'V')
 550         _Jv_NewArrayClass (this, NULL, (_Jv_VTable *) array_vtable);
 551       else
 552         arrayclass = NULL;
 553     }
 554 };
 555
 556 // We use this to define both primitive classes and the vtables for
 557 // arrays of primitive classes.  The latter are given names so that we
 558 // can refer to them from the compiler, allowing us to construct
 559 // arrays of primitives statically.
 560 #define DECLARE_PRIM_TYPE(NAME, SIG, LEN) \
 561   _Jv_ArrayVTable _Jv_##NAME##VTable; \
 562   _Jv_PrimClass _Jv_##NAME##Class((jobject) #NAME, (jbyte) SIG, (jint) LEN, \
 563                                   (jobject) &_Jv_##NAME##VTable)
 564
 565 DECLARE_PRIM_TYPE(byte, 'B', 1);
 566 DECLARE_PRIM_TYPE(short, 'S', 2);
 567 DECLARE_PRIM_TYPE(int, 'I', 4);
 568 DECLARE_PRIM_TYPE(long, 'J', 8);
 569 DECLARE_PRIM_TYPE(boolean, 'Z', 1);
 570 DECLARE_PRIM_TYPE(char, 'C', 2);
 571 DECLARE_PRIM_TYPE(float, 'F', 4);
 572 DECLARE_PRIM_TYPE(double, 'D', 8);
 573 DECLARE_PRIM_TYPE(void, 'V', 0);
 574
 575 jclass
 576 _Jv_FindClassFromSignature (char *sig, java::lang::ClassLoader *loader)
 577 {
 578   switch (*sig)
 579     {
 580     case 'B':
 581       return JvPrimClass (byte);
 582     case 'S':
 583       return JvPrimClass (short);
 584     case 'I':
 585       return JvPrimClass (int);
 586     case 'J':
 587       return JvPrimClass (long);
 588     case 'Z':
 589       return JvPrimClass (boolean);
 590     case 'C':
 591       return JvPrimClass (char);
 592     case 'F':
 593       return JvPrimClass (float);
 594     case 'D':
 595       return JvPrimClass (double);
 596     case 'V':
 597       return JvPrimClass (void);
 598     case 'L':
 599       {
 600         int i;
 601         for (i = 1; sig[i] && sig[i] != ';'; ++i)
 602           ;
 603         _Jv_Utf8Const *name = _Jv_makeUtf8Const (&sig[1], i - 1);
 604         return _Jv_FindClass (name, loader);
 605
 606       }
 607     case '[':
 608       return _Jv_GetArrayClass (_Jv_FindClassFromSignature (&sig[1], loader),
 609                                 loader);
 610     }
 611   JvFail ("couldn't understand class signature");
 612   return NULL;                  // Placate compiler.
 613 }
 614
 615 \f
 616
 617 JArray<jstring> *
 618 JvConvertArgv (int argc, const char **argv)
 619 {
 620   if (argc < 0)
 621     argc = 0;
 622   jobjectArray ar = JvNewObjectArray(argc, &StringClass, NULL);
 623   jobject* ptr = elements(ar);
 624   for (int i = 0;  i < argc;  i++)
 625     {
 626       const char *arg = argv[i];
 627       // FIXME - should probably use JvNewStringUTF.
 628       *ptr++ = JvNewStringLatin1(arg, strlen(arg));
 629     }
 630   return (JArray<jstring>*) ar;
 631 }
 632
 633 // FIXME: These variables are static so that they will be
 634 // automatically scanned by the Boehm collector.  This is needed
 635 // because with qthreads the collector won't scan the initial stack --
 636 // it will only scan the qthreads stacks.
 637
 638 // Command line arguments.
 639 static jobject arg_vec;
 640
 641 // The primary thread.
 642 static java::lang::Thread *main_thread;
 643
 644 char *
 645 _Jv_ThisExecutable (void)
 646 {
 647   return _Jv_execName;
 648 }
 649
 650 void
 651 _Jv_ThisExecutable (const char *name)
 652 {
 653   if (name)
 654     {
 655       _Jv_execName = new char[strlen (name) + 1];
 656       strcpy (_Jv_execName, name);
 657     }
 658 }
 659
 660 #ifdef USE_WIN32_SIGNALLING
 661
 662 extern "C" int* win32_get_restart_frame (void *);
 663
 664 LONG CALLBACK
 665 win32_exception_handler (LPEXCEPTION_POINTERS e)
 666 {
 667   int* setjmp_buf;
 668   if (e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 669     setjmp_buf = win32_get_restart_frame (nullp);
 670   else if (e->ExceptionRecord->ExceptionCode == EXCEPTION_INT_DIVIDE_BY_ZERO)
 671     setjmp_buf = win32_get_restart_frame (arithexception);
 672   else
 673     return EXCEPTION_CONTINUE_SEARCH;
 674
 675   e->ContextRecord->Ebp = setjmp_buf[0];
 676   // FIXME: Why does i386-signal.h increment the PC here, do we need to do it?
 677   e->ContextRecord->Eip = setjmp_buf[1];
 678   // FIXME: Is this the stack pointer? Do we need it?
 679   e->ContextRecord->Esp = setjmp_buf[2];
 680
 681   return EXCEPTION_CONTINUE_EXECUTION;
 682 }
 683
 684 #endif
 685
 686 static void
 687 main_init ()
 688 {
 689   // Turn stack trace generation off while creating exception objects.
 690   _Jv_InitClass (&java::lang::Throwable::class$);
 691   java::lang::Throwable::trace_enabled = 0;
 692
 693   INIT_SEGV;
 694 #ifdef HANDLE_FPE
 695   INIT_FPE;
 696 #else
 697   arithexception = new java::lang::ArithmeticException
 698     (JvNewStringLatin1 ("/ by zero"));
 699 #endif
 700
 701   no_memory = new java::lang::OutOfMemoryError;
 702
 703   java::lang::Throwable::trace_enabled = 1;
 704
 705 #ifdef USE_LTDL
 706   LTDL_SET_PRELOADED_SYMBOLS ();
 707 #endif
 708
 709 #ifdef USE_WINSOCK
 710   // Initialise winsock for networking
 711   WSADATA data;
 712   if (WSAStartup (MAKEWORD (1, 1), &data))
 713       MessageBox (NULL, "Error initialising winsock library.", "Error", MB_OK | MB_ICONEXCLAMATION);
 714 #endif /* USE_WINSOCK */
 715
 716 #ifdef USE_WIN32_SIGNALLING
 717   // Install exception handler
 718   SetUnhandledExceptionFilter (win32_exception_handler);
 719 #else
 720   // We only want this on POSIX systems.
 721   struct sigaction act;
 722   act.sa_handler = SIG_IGN;
 723   sigemptyset (&act.sa_mask);
 724   act.sa_flags = 0;
 725   sigaction (SIGPIPE, &act, NULL);
 726 #endif /* USE_WIN32_SIGNALLING */
 727
 728   _Jv_JNI_Init ();
 729 }
 730
 731 #ifndef DISABLE_GETENV_PROPERTIES
 732
 733 static char *
 734 next_property_key (char *s, size_t *length)
 735 {
 736   size_t l = 0;
 737
 738   JvAssert (s);
 739
 740   // Skip over whitespace
 741   while (isspace (*s))
 742     s++;
 743
 744   // If we've reached the end, return NULL.  Also return NULL if for
 745   // some reason we've come across a malformed property string.
 746   if (*s == 0
 747       || *s == ':'
 748       || *s == '=')
 749     return NULL;
 750
 751   // Determine the length of the property key.
 752   while (s[l] != 0
 753          && ! isspace (s[l])
 754          && s[l] != ':'
 755          && s[l] != '=')
 756     {
 757       if (s[l] == '\\'
 758           && s[l+1] != 0)
 759         l++;
 760       l++;
 761     }
 762
 763   *length = l;
 764
 765   return s;
 766 }
 767
 768 static char *
 769 next_property_value (char *s, size_t *length)
 770 {
 771   size_t l = 0;
 772
 773   JvAssert (s);
 774
 775   while (isspace (*s))
 776     s++;
 777
 778   if (*s == ':'
 779       || *s == '=')
 780     s++;
 781
 782   while (isspace (*s))
 783     s++;
 784
 785   // If we've reached the end, return NULL.
 786   if (*s == 0)
 787     return NULL;
 788
 789   // Determine the length of the property value.
 790   while (s[l] != 0
 791          && ! isspace (s[l])
 792          && s[l] != ':'
 793          && s[l] != '=')
 794     {
 795       if (s[l] == '\\'
 796           && s[l+1] != 0)
 797         l += 2;
 798       else
 799         l++;
 800     }
 801
 802   *length = l;
 803
 804   return s;
 805 }
 806
 807 static void
 808 process_gcj_properties ()
 809 {
 810   char *props = getenv("GCJ_PROPERTIES");
 811   char *p = props;
 812   size_t length;
 813   size_t property_count = 0;
 814
 815   if (NULL == props)
 816     return;
 817
 818   // Whip through props quickly in order to count the number of
 819   // property values.
 820   while (p && (p = next_property_key (p, &length)))
 821     {
 822       // Skip to the end of the key
 823       p += length;
 824
 825       p = next_property_value (p, &length);
 826       if (p)
 827         p += length;
 828
 829       property_count++;
 830     }
 831
 832   // Allocate an array of property value/key pairs.
 833   _Jv_Environment_Properties =
 834     (property_pair *) malloc (sizeof(property_pair)
 835                               * (property_count + 1));
 836
 837   // Go through the properties again, initializing _Jv_Properties
 838   // along the way.
 839   p = props;
 840   property_count = 0;
 841   while (p && (p = next_property_key (p, &length)))
 842     {
 843       _Jv_Environment_Properties[property_count].key = p;
 844       _Jv_Environment_Properties[property_count].key_length = length;
 845
 846       // Skip to the end of the key
 847       p += length;
 848
 849       p = next_property_value (p, &length);
 850
 851       _Jv_Environment_Properties[property_count].value = p;
 852       _Jv_Environment_Properties[property_count].value_length = length;
 853
 854       if (p)
 855         p += length;
 856
 857       property_count++;
 858     }
 859   memset ((void *) &_Jv_Environment_Properties[property_count],
 860           0, sizeof (property_pair));
 861   {
 862     size_t i = 0;
 863
 864     // Null terminate the strings.
 865     while (_Jv_Environment_Properties[i].key)
 866       {
 867         _Jv_Environment_Properties[i].key[_Jv_Environment_Properties[i].key_length] = 0;
 868         _Jv_Environment_Properties[i++].value[_Jv_Environment_Properties[i].value_length] = 0;
 869       }
 870   }
 871 }
 872 #endif // DISABLE_GETENV_PROPERTIES
 873
 874 void
 875 JvRunMain (jclass klass, int argc, const char **argv)
 876 {
 877   PROCESS_GCJ_PROPERTIES;
 878
 879   _Jv_argv = argv;
 880   _Jv_argc = argc;
 881
 882   main_init ();
 883 #ifdef HAVE_PROC_SELF_EXE
 884   char exec_name[20];
 885   sprintf (exec_name, "/proc/%d/exe", getpid ());
 886   _Jv_ThisExecutable (exec_name);
 887 #else
 888   _Jv_ThisExecutable (argv[0]);
 889 #endif
 890
 891   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 892   main_thread = new gnu::gcj::runtime::FirstThread (klass, arg_vec);
 893
 894   main_thread->start();
 895   _Jv_ThreadWait ();
 896
 897   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 898
 899   java::lang::Runtime::getRuntime ()->exit (status);
 900 }
 901
 902 void
 903 _Jv_RunMain (const char *name, int argc, const char **argv, bool is_jar)
 904 {
 905   jstring class_name;
 906   PROCESS_GCJ_PROPERTIES;
 907
 908   main_init ();
 909
 910 #ifdef HAVE_PROC_SELF_EXE
 911   char exec_name[20];
 912   sprintf (exec_name, "/proc/%d/exe", getpid ());
 913   _Jv_ThisExecutable (exec_name);
 914 #endif
 915
 916   if (is_jar)
 917     {
 918       // name specifies a jar file.  We must now extract the
 919       // Main-Class attribute from the jar's manifest file.  This is
 920       // done by gnu.gcj.runtime.FirstThread.main.
 921       _Jv_Jar_Class_Path = strdup (name);
 922       arg_vec = JvConvertArgv (1, &_Jv_Jar_Class_Path);
 923
 924       main_thread =
 925         new gnu::gcj::runtime::FirstThread (&gnu::gcj::runtime::FirstThread::class$,
 926                                             arg_vec);
 927       main_thread->start();
 928       _Jv_ThreadWait ();
 929
 930       // FirstThread.main extracts the main class name and stores it
 931       // here.
 932       class_name = gnu::gcj::runtime::FirstThread::jarMainClassName;
 933
 934       // We need a new ClassLoader because the classpath must be the
 935       // jar file only.  The easiest way to do this is to lose our
 936       // reference to the previous classloader.
 937       java::lang::ClassLoader::system = NULL;
 938     }
 939   else
 940     class_name = JvNewStringLatin1 (name);
 941
 942   arg_vec = JvConvertArgv (argc - 1, argv + 1);
 943
 944   if (class_name)
 945     {
 946       main_thread = new gnu::gcj::runtime::FirstThread (class_name, arg_vec);
 947       main_thread->start();
 948       _Jv_ThreadWait ();
 949     }
 950
 951   int status = (int) java::lang::ThreadGroup::had_uncaught_exception;
 952
 953   java::lang::Runtime::getRuntime ()->exit (status);
 954 }
 955
 956 \f
 957
 958 // Parse a string and return a heap size.
 959 static size_t
 960 parse_heap_size (const char *spec)
 961 {
 962   char *end;
 963   unsigned long val = strtoul (spec, &end, 10);
 964   if (*end == 'k' || *end == 'K')
 965     val *= 1024;
 966   else if (*end == 'm' || *end == 'M')
 967     val *= 1048576;
 968   return (size_t) val;
 969 }
 970
 971 // Set the initial heap size.  This might be ignored by the GC layer.
 972 // This must be called before _Jv_RunMain.
 973 void
 974 _Jv_SetInitialHeapSize (const char *arg)
 975 {
 976   size_t size = parse_heap_size (arg);
 977   _Jv_GCSetInitialHeapSize (size);
 978 }
 979
 980 // Set the maximum heap size.  This might be ignored by the GC layer.
 981 // This must be called before _Jv_RunMain.
 982 void
 983 _Jv_SetMaximumHeapSize (const char *arg)
 984 {
 985   size_t size = parse_heap_size (arg);
 986   _Jv_GCSetMaximumHeapSize (size);
 987 }
 988
 989 \f
 990
 991 void *
 992 _Jv_Malloc (jsize size)
 993 {
 994   if (__builtin_expect (size == 0, false))
 995     size = 1;
 996   void *ptr = malloc ((size_t) size);
 997   if (__builtin_expect (ptr == NULL, false))
 998     JvThrow (no_memory);
 999   return ptr;
1000 }
1001
1002 void *
1003 _Jv_Realloc (void *ptr, jsize size)
1004 {
1005   if (__builtin_expect (size == 0, false))
1006     size = 1;
1007   ptr = realloc (ptr, (size_t) size);
1008   if (__builtin_expect (ptr == NULL, false))
1009     JvThrow (no_memory);
1010   return ptr;
1011 }
1012
1013 void *
1014 _Jv_MallocUnchecked (jsize size)
1015 {
1016   if (__builtin_expect (size == 0, false))
1017     size = 1;
1018   return malloc ((size_t) size);
1019 }
1020
1021 void
1022 _Jv_Free (void* ptr)
1023 {
1024   return free (ptr);
1025 }
1026
1027 \f
1028
1029 // In theory, these routines can be #ifdef'd away on machines which
1030 // support divide overflow signals.  However, we never know if some
1031 // code might have been compiled with "-fuse-divide-subroutine", so we
1032 // always include them in libgcj.
1033
1034 jint
1035 _Jv_divI (jint dividend, jint divisor)
1036 {
1037   if (__builtin_expect (divisor == 0, false))
1038     _Jv_ThrowSignal (arithexception);
1039
1040   if (dividend == (jint) 0x80000000L && divisor == -1)
1041     return dividend;
1042
1043   return dividend / divisor;
1044 }
1045
1046 jint
1047 _Jv_remI (jint dividend, jint divisor)
1048 {
1049   if (__builtin_expect (divisor == 0, false))
1050     _Jv_ThrowSignal (arithexception);
1051
1052   if (dividend == (jint) 0x80000000L && divisor == -1)
1053     return 0;
1054
1055   return dividend % divisor;
1056 }
1057
1058 jlong
1059 _Jv_divJ (jlong dividend, jlong divisor)
1060 {
1061   if (__builtin_expect (divisor == 0, false))
1062     _Jv_ThrowSignal (arithexception);
1063
1064   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1065     return dividend;
1066
1067   return dividend / divisor;
1068 }
1069
1070 jlong
1071 _Jv_remJ (jlong dividend, jlong divisor)
1072 {
1073   if (__builtin_expect (divisor == 0, false))
1074     _Jv_ThrowSignal (arithexception);
1075
1076   if (dividend == (jlong) 0x8000000000000000LL && divisor == -1)
1077     return 0;
1078
1079   return dividend % divisor;
1080 }