libjava/include/jvm.h

   1 // jvm.h - Header file for private implementation information. -*- c++ -*-
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005  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 #ifndef __JAVA_JVM_H__
  12 #define __JAVA_JVM_H__
  13
  14 // Define this before including jni.h.
  15 // jni.h is included by jvmpi.h, which might be included.  We define
  16 // this unconditionally because it is convenient and it lets other
  17 // files include jni.h without difficulty.
  18 #define __GCJ_JNI_IMPL__
  19
  20 #include <gcj/javaprims.h>
  21
  22 #include <java-assert.h>
  23 #include <java-threads.h>
  24 // Must include java-gc.h before Object.h for the implementation.
  25 #include <java-gc.h>
  26
  27 #include <java/lang/Object.h>
  28
  29 // Include cni.h before field.h to enable all definitions.  FIXME.
  30 #include <gcj/cni.h>
  31 #include <gcj/field.h>
  32
  33 /* Macro for possible unused arguments.  */
  34 #define MAYBE_UNUSED __attribute__((__unused__))
  35
  36 /* Structure of the virtual table.  */
  37 struct _Jv_VTable
  38 {
  39 #ifdef __ia64__
  40   typedef struct { void *pc, *gp; } vtable_elt;
  41 #else
  42   typedef void *vtable_elt;
  43 #endif
  44   jclass clas;
  45   void *gc_descr;
  46
  47   // This must be last, as derived classes "extend" this by
  48   // adding new data members.
  49   vtable_elt method[1];
  50
  51 #ifdef __ia64__
  52   void *get_method(int i) { return &method[i]; }
  53   void set_method(int i, void *fptr) { method[i] = *(vtable_elt *)fptr; }
  54   void *get_finalizer()
  55   {
  56     // We know that get_finalizer is only used for checking whether
  57     // this object needs to have a finalizer registered.  So it is
  58     // safe to simply return just the PC component of the vtable
  59     // slot.
  60     return ((vtable_elt *)(get_method(0)))->pc;
  61   }
  62 #else
  63   void *get_method(int i) { return method[i]; }
  64   void set_method(int i, void *fptr) { method[i] = fptr; }
  65   void *get_finalizer() { return get_method(0); }
  66 #endif
  67
  68   static size_t vtable_elt_size() { return sizeof(vtable_elt); }
  69
  70   // Given a method index, return byte offset from the vtable pointer.
  71   static jint idx_to_offset (int index)
  72   {
  73     return (2 * sizeof (void *)) + (index * vtable_elt_size ());
  74   }
  75   static _Jv_VTable *new_vtable (int count);
  76 };
  77
  78 // Number of virtual methods on object.  FIXME: it sucks that we have
  79 // to keep this up to date by hand.
  80 #define NUM_OBJECT_METHODS 5
  81
  82 union _Jv_word
  83 {
  84   jobject o;
  85   jint i;                       // Also stores smaller integral types.
  86   jfloat f;
  87   jint ia[1];                   // Half of _Jv_word2.
  88   void* p;
  89
  90 #if SIZEOF_VOID_P == 8
  91   // We can safely put a long or a double in here without increasing
  92   // the size of _Jv_Word; we take advantage of this in the interpreter.
  93   jlong l;
  94   jdouble d;
  95 #endif
  96
  97   jclass                     clazz;
  98   jstring                    string;
  99   struct _Jv_Field          *field;
 100   struct _Jv_Utf8Const      *utf8;
 101   struct _Jv_ResolvedMethod *rmethod;
 102 };
 103
 104 union _Jv_word2
 105 {
 106   jint ia[2];
 107   jlong l;
 108   jdouble d;
 109 };
 110
 111 union _Jv_value
 112 {
 113   jbyte byte_value;
 114   jshort short_value;
 115   jchar char_value;
 116   jint int_value;
 117   jlong long_value;
 118   jfloat float_value;
 119   jdouble double_value;
 120   jobject object_value;
 121 };
 122
 123 /* Extract a character from a Java-style Utf8 string.
 124  * PTR points to the current character.
 125  * LIMIT points to the end of the Utf8 string.
 126  * PTR is incremented to point after the character thta gets returns.
 127  * On an error, -1 is returned. */
 128 #define UTF8_GET(PTR, LIMIT) \
 129   ((PTR) >= (LIMIT) ? -1 \
 130    : *(PTR) < 128 ? *(PTR)++ \
 131    : (*(PTR)&0xE0) == 0xC0 && ((PTR)+=2)<=(LIMIT) && ((PTR)[-1]&0xC0) == 0x80 \
 132    ? (((PTR)[-2] & 0x1F) << 6) + ((PTR)[-1] & 0x3F) \
 133    : (*(PTR) & 0xF0) == 0xE0 && ((PTR) += 3) <= (LIMIT) \
 134    && ((PTR)[-2] & 0xC0) == 0x80 && ((PTR)[-1] & 0xC0) == 0x80 \
 135    ? (((PTR)[-3]&0x0F) << 12) + (((PTR)[-2]&0x3F) << 6) + ((PTR)[-1]&0x3F) \
 136    : ((PTR)++, -1))
 137
 138 extern int _Jv_strLengthUtf8(char* str, int len);
 139
 140 typedef struct _Jv_Utf8Const Utf8Const;
 141 _Jv_Utf8Const *_Jv_makeUtf8Const (char *s, int len);
 142 _Jv_Utf8Const *_Jv_makeUtf8Const (jstring string);
 143 extern jboolean _Jv_equalUtf8Consts (const _Jv_Utf8Const *, const _Jv_Utf8Const *);
 144 extern jboolean _Jv_equal (_Jv_Utf8Const *, jstring, jint);
 145 extern jboolean _Jv_equaln (_Jv_Utf8Const *, jstring, jint);
 146
 147 /* Helper class which converts a jstring to a temporary char*.
 148    Uses the supplied buffer, if non-null. Otherwise, allocates
 149    the buffer on the heap. Use the JV_TEMP_UTF_STRING macro,
 150    which follows, to automatically allocate a stack buffer if
 151    the string is small enough. */
 152 class _Jv_TempUTFString
 153 {
 154 public:
 155   _Jv_TempUTFString(jstring jstr, char* buf=0);
 156   ~_Jv_TempUTFString();
 157
 158 // Accessors
 159   operator const char*() const
 160   {
 161     return buf_;
 162   }
 163   const char* buf() const
 164   {
 165     return buf_;
 166   }
 167   char* buf()
 168   {
 169     return buf_;
 170   }
 171
 172 private:
 173   char* buf_;
 174   bool heapAllocated_;
 175 };
 176
 177 inline _Jv_TempUTFString::_Jv_TempUTFString (jstring jstr, char* buf)
 178   : buf_(0), heapAllocated_(false)
 179 {
 180   if (!jstr) return;
 181   jsize len = JvGetStringUTFLength (jstr);
 182   if (buf)
 183     buf_ = buf;
 184   else
 185     {
 186       buf_ = (char*) _Jv_Malloc (len+1);
 187       heapAllocated_ = true;
 188     }
 189
 190   JvGetStringUTFRegion (jstr, 0, jstr->length(), buf_);
 191   buf_[len] = '\0';
 192 }
 193
 194 inline _Jv_TempUTFString::~_Jv_TempUTFString ()
 195 {
 196   if (heapAllocated_)
 197     _Jv_Free (buf_);
 198 }
 199
 200 /* Macro which uses _Jv_TempUTFString. Allocates a stack-based
 201    buffer if the string and its null terminator are <= 256
 202    characters in length. Otherwise, a heap-based buffer is
 203    used. The parameters to this macro are the variable name
 204    which is an instance of _Jv_TempUTFString (above) and a
 205    jstring.
 206
 207    Sample Usage:
 208
 209    jstring jstr = getAJString();
 210    JV_TEMP_UTF_STRING(utfstr, jstr);
 211    printf("The string is: %s\n", utfstr.buf());
 212
 213  */
 214 #define JV_TEMP_UTF_STRING(utfstr, jstr) \
 215   jstring utfstr##thejstr = (jstr); \
 216   jsize utfstr##_len = utfstr##thejstr ? JvGetStringUTFLength (utfstr##thejstr) + 1 : 0; \
 217   char utfstr##_buf[utfstr##_len <= 256 ? utfstr##_len : 0]; \
 218   _Jv_TempUTFString utfstr(utfstr##thejstr, sizeof(utfstr##_buf)==0 ? 0 : utfstr##_buf)
 219
 220 namespace gcj
 221 {
 222   /* Some constants used during lookup of special class methods.  */
 223   extern _Jv_Utf8Const *void_signature; /* "()V" */
 224   extern _Jv_Utf8Const *clinit_name;    /* "<clinit>" */
 225   extern _Jv_Utf8Const *init_name;      /* "<init>" */
 226   extern _Jv_Utf8Const *finit_name;     /* "finit$", */
 227
 228   /* Set to true by _Jv_CreateJavaVM. */
 229   extern bool runtimeInitialized;
 230
 231   /* Print out class names as they are initialized. */
 232   extern bool verbose_class_flag;
 233
 234   /* When true, enable the bytecode verifier and BC-ABI verification. */
 235   extern bool verifyClasses;
 236 }
 237
 238 // This class handles all aspects of class preparation and linking.
 239 class _Jv_Linker
 240 {
 241 private:
 242   static _Jv_Field *find_field_helper(jclass, _Jv_Utf8Const *, _Jv_Utf8Const *,
 243                                       jclass *);
 244   static _Jv_Field *find_field(jclass, jclass, jclass *, _Jv_Utf8Const *,
 245                                _Jv_Utf8Const *);
 246   static void prepare_constant_time_tables(jclass);
 247   static jshort get_interfaces(jclass, _Jv_ifaces *);
 248   static void link_symbol_table(jclass);
 249   static void link_exception_table(jclass);
 250   static void layout_interface_methods(jclass);
 251   static void layout_vtable_methods(jclass);
 252   static void set_vtable_entries(jclass, _Jv_VTable *);
 253   static void make_vtable(jclass);
 254   static void ensure_fields_laid_out(jclass);
 255   static void ensure_class_linked(jclass);
 256   static void ensure_supers_installed(jclass);
 257   static void add_miranda_methods(jclass, jclass);
 258   static void ensure_method_table_complete(jclass);
 259   static void verify_class(jclass);
 260   static jshort find_iindex(jclass *, jshort *, jshort);
 261   static jshort indexof(void *, void **, jshort);
 262   static int get_alignment_from_class(jclass);
 263   static void generate_itable(jclass, _Jv_ifaces *, jshort *);
 264   static jshort append_partial_itable(jclass, jclass, void **, jshort);
 265   static _Jv_Method *search_method_in_class (jclass, jclass,
 266                                              _Jv_Utf8Const *,
 267                                              _Jv_Utf8Const *);
 268
 269 public:
 270
 271   static bool has_field_p (jclass, _Jv_Utf8Const *);
 272   static void print_class_loaded (jclass);
 273   static void resolve_class_ref (jclass, jclass *);
 274   static void wait_for_state(jclass, int);
 275   static _Jv_word resolve_pool_entry (jclass, int);
 276   static void resolve_field (_Jv_Field *, java::lang::ClassLoader *);
 277   static void verify_type_assertions (jclass);
 278 };
 279
 280 /* Type of pointer used as finalizer.  */
 281 typedef void _Jv_FinalizerFunc (jobject);
 282
 283 /* Allocate space for a new Java object.  */
 284 void *_Jv_AllocObj (jsize size, jclass cl) __attribute__((__malloc__));
 285 /* Allocate space for a potentially uninitialized pointer-free object.
 286    Interesting only with JV_HASH_SYNCHRONIZATION.  */
 287 void *_Jv_AllocPtrFreeObj (jsize size, jclass cl) __attribute__((__malloc__));
 288 /* Allocate space for an array of Java objects.  */
 289 void *_Jv_AllocArray (jsize size, jclass cl) __attribute__((__malloc__));
 290 /* Allocate space that is known to be pointer-free.  */
 291 void *_Jv_AllocBytes (jsize size) __attribute__((__malloc__));
 292 /* Allocate space for a new non-Java object, which does not have the usual
 293    Java object header but may contain pointers to other GC'ed objects.  */
 294 void *_Jv_AllocRawObj (jsize size) __attribute__((__malloc__));
 295 /* Explicitly throw an out-of-memory exception. */
 296 void _Jv_ThrowNoMemory() __attribute__((__noreturn__));
 297 /* Allocate an object with a single pointer.  The first word is reserved
 298    for the GC, and the second word is the traced pointer.  */
 299 void *_Jv_AllocTraceOne (jsize size /* incl. reserved slot */);
 300 /* Ditto, but for two traced pointers.                     */
 301 void *_Jv_AllocTraceTwo (jsize size /* incl. reserved slot */);
 302 /* Initialize the GC.  */
 303 void _Jv_InitGC (void);
 304 /* Register a finalizer.  */
 305 void _Jv_RegisterFinalizer (void *object, _Jv_FinalizerFunc *method);
 306 /* Compute the GC descriptor for a class */
 307 void * _Jv_BuildGCDescr(jclass);
 308
 309 /* Allocate some unscanned, unmoveable memory.  Return NULL if out of
 310    memory.  */
 311 void *_Jv_MallocUnchecked (jsize size) __attribute__((__malloc__));
 312
 313 /* Initialize finalizers.  The argument is a function to be called
 314    when a finalizer is ready to be run.  */
 315 void _Jv_GCInitializeFinalizers (void (*notifier) (void));
 316 /* Run finalizers for objects ready to be finalized..  */
 317 void _Jv_RunFinalizers (void);
 318 /* Run all finalizers.  Should be called only before exit.  */
 319 void _Jv_RunAllFinalizers (void);
 320 /* Perform a GC.  */
 321 void _Jv_RunGC (void);
 322 /* Disable and enable GC.  */
 323 void _Jv_DisableGC (void);
 324 void _Jv_EnableGC (void);
 325 /* Register a disappearing link.  This is a field F which should be
 326    cleared when *F is found to be inaccessible.  This is used in the
 327    implementation of java.lang.ref.Reference.  */
 328 void _Jv_GCRegisterDisappearingLink (jobject *objp);
 329 /* Return true if OBJECT should be reclaimed.  This is used to
 330    implement soft references.  */
 331 jboolean _Jv_GCCanReclaimSoftReference (jobject obj);
 332
 333 /* Register a finalizer for a String object.  This is only used by
 334    the intern() implementation.  */
 335 void _Jv_RegisterStringFinalizer (jobject str);
 336 /* This is called to actually finalize a possibly-intern()d String.  */
 337 void _Jv_FinalizeString (jobject str);
 338
 339 /* Return approximation of total size of heap.  */
 340 long _Jv_GCTotalMemory (void);
 341 /* Return approximation of total free memory.  */
 342 long _Jv_GCFreeMemory (void);
 343
 344 /* Set initial heap size.  If SIZE==0, ignore.  Should be run before
 345    _Jv_InitGC.  Not required to have any actual effect.  */
 346 void _Jv_GCSetInitialHeapSize (size_t size);
 347
 348 /* Set maximum heap size.  If SIZE==0, unbounded.  Should be run
 349    before _Jv_InitGC.  Not required to have any actual effect.  */
 350 void _Jv_GCSetMaximumHeapSize (size_t size);
 351
 352 /* External interface to setting the heap size.  Parses ARG (a number
 353    which can optionally have "k" or "m" appended and calls
 354    _Jv_GCSetInitialHeapSize.  */
 355 void _Jv_SetInitialHeapSize (const char *arg);
 356
 357 /* External interface to setting the maximum heap size.  Parses ARG (a
 358    number which can optionally have "k" or "m" appended and calls
 359    _Jv_GCSetMaximumHeapSize.  */
 360 void _Jv_SetMaximumHeapSize (const char *arg);
 361
 362 /* Free the method cache, if one was allocated.  This is only called
 363    during thread deregistration.  */
 364 void _Jv_FreeMethodCache ();
 365
 366 extern "C" void JvRunMain (jclass klass, int argc, const char **argv);
 367 void _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 368                   bool is_jar);
 369
 370 void _Jv_RunMain (struct _Jv_VMInitArgs *vm_args, jclass klass,
 371                   const char *name, int argc, const char **argv, bool is_jar);
 372
 373 // Delayed until after _Jv_AllocBytes is declared.
 374 //
 375 // Note that we allocate this as unscanned memory -- the vtables
 376 // are handled specially by the GC.
 377
 378 inline _Jv_VTable *
 379 _Jv_VTable::new_vtable (int count)
 380 {
 381   size_t size = sizeof(_Jv_VTable) + (count - 1) * vtable_elt_size ();
 382   return (_Jv_VTable *) _Jv_AllocBytes (size);
 383 }
 384
 385 // Determine if METH gets an entry in a VTable.
 386 static inline jboolean _Jv_isVirtualMethod (_Jv_Method *meth)
 387 {
 388   using namespace java::lang::reflect;
 389   return (((meth->accflags & (Modifier::STATIC | Modifier::PRIVATE)) == 0)
 390           && meth->name->first() != '<');
 391 }
 392
 393 // This function is used to determine the hash code of an object.
 394 inline jint
 395 _Jv_HashCode (jobject obj)
 396 {
 397   // This was chosen to yield relatively well distributed results on
 398   // both 32- and 64-bit architectures.  Note 0x7fffffff is prime.
 399   // FIXME: we assume sizeof(long) == sizeof(void *).
 400   return (jint) ((unsigned long) obj % 0x7fffffff);
 401 }
 402
 403 // Return a raw pointer to the elements of an array given the array
 404 // and its element type.  You might think we could just pick a single
 405 // array type and use elements() on it, but we can't because we must
 406 // account for alignment of the element type.  When ARRAY is null, we
 407 // obtain the number of bytes taken by the base part of the array.
 408 inline char *
 409 _Jv_GetArrayElementFromElementType (jobject array,
 410                                     jclass element_type)
 411 {
 412   char *elts;
 413   if (element_type == JvPrimClass (byte))
 414     elts = (char *) elements ((jbyteArray) array);
 415   else if (element_type == JvPrimClass (short))
 416     elts = (char *) elements ((jshortArray) array);
 417   else if (element_type == JvPrimClass (int))
 418     elts = (char *) elements ((jintArray) array);
 419   else if (element_type == JvPrimClass (long))
 420     elts = (char *) elements ((jlongArray) array);
 421   else if (element_type == JvPrimClass (boolean))
 422     elts = (char *) elements ((jbooleanArray) array);
 423   else if (element_type == JvPrimClass (char))
 424     elts = (char *) elements ((jcharArray) array);
 425   else if (element_type == JvPrimClass (float))
 426     elts = (char *) elements ((jfloatArray) array);
 427   else if (element_type == JvPrimClass (double))
 428     elts = (char *) elements ((jdoubleArray) array);
 429   else
 430     elts = (char *) elements ((jobjectArray) array);
 431   return elts;
 432 }
 433
 434 extern "C" void _Jv_ThrowBadArrayIndex (jint bad_index)
 435   __attribute__((noreturn));
 436 extern "C" void _Jv_ThrowNullPointerException (void)
 437   __attribute__((noreturn));
 438 extern "C" jobject _Jv_NewArray (jint type, jint size)
 439   __attribute__((__malloc__));
 440 extern "C" jobject _Jv_NewMultiArray (jclass klass, jint dims, ...)
 441   __attribute__((__malloc__));
 442 extern "C" void *_Jv_CheckCast (jclass klass, jobject obj);
 443 extern "C" void *_Jv_LookupInterfaceMethod (jclass klass, Utf8Const *name,
 444                                            Utf8Const *signature);
 445 extern "C" void *_Jv_LookupInterfaceMethodIdx (jclass klass, jclass iface,
 446                                                int meth_idx);
 447 extern "C" void _Jv_CheckArrayStore (jobject array, jobject obj);
 448 extern "C" void _Jv_RegisterClass (jclass klass);
 449 extern "C" void _Jv_RegisterClasses (const jclass *classes);
 450 extern "C" void _Jv_RegisterClasses_Counted (const jclass *classes,
 451                                              size_t count);
 452 extern "C" void _Jv_RegisterResource (void *vptr);
 453 extern void _Jv_UnregisterClass (_Jv_Utf8Const*, java::lang::ClassLoader*);
 454
 455 extern jclass _Jv_FindClass (_Jv_Utf8Const *name,
 456                              java::lang::ClassLoader *loader);
 457 extern jclass _Jv_FindClassFromSignature (char *,
 458                                           java::lang::ClassLoader *loader,
 459                                           char ** = NULL);
 460 extern void _Jv_GetTypesFromSignature (jmethodID method,
 461                                        jclass declaringClass,
 462                                        JArray<jclass> **arg_types_out,
 463                                        jclass *return_type_out);
 464
 465 extern jboolean _Jv_CheckAccess (jclass self_klass, jclass other_klass,
 466                                  jint flags);
 467
 468 extern jobject _Jv_CallAnyMethodA (jobject obj, jclass return_type,
 469                                    jmethodID meth, jboolean is_constructor,
 470                                    JArray<jclass> *parameter_types,
 471                                    jobjectArray args,
 472                                    jclass iface = NULL);
 473
 474 union jvalue;
 475 extern void _Jv_CallAnyMethodA (jobject obj,
 476                                 jclass return_type,
 477                                 jmethodID meth,
 478                                 jboolean is_constructor,
 479                                 jboolean is_virtual_call,
 480                                 JArray<jclass> *parameter_types,
 481                                 jvalue *args,
 482                                 jvalue *result,
 483                                 jboolean is_jni_call = true,
 484                                 jclass iface = NULL);
 485
 486 extern jobject _Jv_NewMultiArray (jclass, jint ndims, jint* dims)
 487   __attribute__((__malloc__));
 488
 489 extern "C" void _Jv_ThrowAbstractMethodError () __attribute__((__noreturn__));
 490
 491 /* Checked divide subroutines. */
 492 extern "C"
 493 {
 494   jint _Jv_divI (jint, jint);
 495   jint _Jv_remI (jint, jint);
 496   jlong _Jv_divJ (jlong, jlong);
 497   jlong _Jv_remJ (jlong, jlong);
 498 }
 499
 500 /* Get the number of arguments (cf. argc) or 0 if our argument
 501    list was never initialized.  */
 502 extern int _Jv_GetNbArgs (void);
 503
 504 /* Get the specified argument (cf. argv[index]) or "" if either
 505    our argument list was never initialized or the specified index
 506    is out of bounds.  */
 507 extern const char * _Jv_GetSafeArg (int index);
 508
 509 /* Sets our argument list. Can be used by programs with non-standard
 510    entry points.  */
 511 extern void _Jv_SetArgs (int argc, const char **argv);
 512
 513 /* Get the name of the running executable.  */
 514 extern const char *_Jv_ThisExecutable (void);
 515
 516 /* Return a pointer to a symbol in executable or loaded library.  */
 517 void *_Jv_FindSymbolInExecutable (const char *);
 518
 519 /* Initialize JNI.  */
 520 extern void _Jv_JNI_Init (void);
 521
 522 /* Get or set the per-thread JNIEnv used by the invocation API.  */
 523 _Jv_JNIEnv *_Jv_GetCurrentJNIEnv ();
 524 void _Jv_SetCurrentJNIEnv (_Jv_JNIEnv *);
 525
 526 /* Free a JNIEnv. */
 527 void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
 528
 529 /* Free a JNIEnv. */
 530 void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
 531
 532 struct _Jv_JavaVM;
 533 _Jv_JavaVM *_Jv_GetJavaVM ();
 534
 535 // Some verification functions from defineclass.cc.
 536 bool _Jv_VerifyFieldSignature (_Jv_Utf8Const*sig);
 537 bool _Jv_VerifyMethodSignature (_Jv_Utf8Const*sig);
 538 bool _Jv_VerifyClassName (unsigned char* ptr, _Jv_ushort length);
 539 bool _Jv_VerifyClassName (_Jv_Utf8Const *name);
 540 bool _Jv_VerifyIdentifier (_Jv_Utf8Const *);
 541 bool _Jv_ClassNameSamePackage (_Jv_Utf8Const *name1, _Jv_Utf8Const *name2);
 542
 543 struct _Jv_core_chain
 544 {
 545   int name_length;
 546   const char *name;
 547   int data_length;
 548   const void *data;
 549
 550   struct _Jv_core_chain *next;
 551 };
 552
 553 // This is called when new core data is loaded.
 554 extern void (*_Jv_RegisterCoreHook) (_Jv_core_chain *);
 555
 556 _Jv_core_chain *_Jv_FindCore (_Jv_core_chain *node, jstring name);
 557 void _Jv_FreeCoreChain (_Jv_core_chain *chain);
 558
 559 #ifdef ENABLE_JVMPI
 560
 561 #include "jvmpi.h"
 562
 563 extern void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 564 extern void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 565 extern void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 566 #endif
 567
 568 /* FIXME: this should really be defined in some more generic place */
 569 #define ROUND(V, A) (((((unsigned) (V))-1) | ((A)-1))+1)
 570
 571 extern void _Jv_RegisterBootstrapPackages ();
 572
 573 #define FLAG_BINARYCOMPAT_ABI (1<<31)  /* Class is built with the BC-ABI. */
 574
 575 #define FLAG_BOOTSTRAP_LOADER (1<<30)  /* Used when defining a class that
 576                                           should be loaded by the bootstrap
 577                                           loader.  */
 578
 579 // These are used to find ABI versions we recognize.
 580 #define GCJ_CXX_ABI_VERSION (__GNUC__ * 100000 + __GNUC_MINOR__ * 1000)
 581
 582 // This is the old-style BC version ID used by GCJ 4.0.0.
 583 #define OLD_GCJ_40_BC_ABI_VERSION (4 * 10000 + 0 * 10 + 5)
 584
 585 // New style version IDs used by GCJ 4.0.1 and later.
 586 #define GCJ_40_BC_ABI_VERSION (4 * 100000 + 0 * 1000)
 587
 588 inline bool
 589 _Jv_CheckABIVersion (unsigned long value)
 590 {
 591   // We are compatible with GCJ 4.0.0 BC-ABI classes. This release used a
 592   // different format for the version ID string.
 593    if (value == OLD_GCJ_40_BC_ABI_VERSION)
 594      return true;
 595
 596   // The 20 low-end bits are used for the version number.
 597   unsigned long version = value & 0xfffff;
 598
 599   if (value & FLAG_BINARYCOMPAT_ABI)
 600     {
 601       int abi_rev = version % 100;
 602       int abi_ver = version - abi_rev;
 603       if (abi_ver == GCJ_40_BC_ABI_VERSION && abi_rev <= 0)
 604         return true;
 605     }
 606   else
 607     // C++ ABI
 608     return version == GCJ_CXX_ABI_VERSION;
 609
 610   return false;
 611 }
 612
 613 inline bool
 614 _Jv_ClassForBootstrapLoader (unsigned long value)
 615 {
 616   return (value & FLAG_BOOTSTRAP_LOADER);
 617 }
 618
 619 // It makes the source cleaner if we simply always define this
 620 // function.  If the interpreter is not built, it will never return
 621 // 'true'.
 622 extern inline jboolean
 623 _Jv_IsInterpretedClass (jclass c)
 624 {
 625   return (c->accflags & java::lang::reflect::Modifier::INTERPRETED) != 0;
 626 }
 627
 628 // Return true if the class was compiled with the BC ABI.
 629 extern inline jboolean
 630 _Jv_IsBinaryCompatibilityABI (jclass c)
 631 {
 632   // There isn't really a better test for the ABI type at this point,
 633   // that will work once the class has been registered.
 634   return c->otable_syms || c->atable_syms || c->itable_syms;
 635 }
 636
 637 #endif /* __JAVA_JVM_H__ */