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   /* Thread stack size specified by the -Xss runtime argument. */
 238   extern size_t stack_size;
 239 }
 240
 241 // This class handles all aspects of class preparation and linking.
 242 class _Jv_Linker
 243 {
 244 private:
 245   static _Jv_Field *find_field_helper(jclass, _Jv_Utf8Const *, _Jv_Utf8Const *,
 246                                       jclass *);
 247   static _Jv_Field *find_field(jclass, jclass, jclass *, _Jv_Utf8Const *,
 248                                _Jv_Utf8Const *);
 249   static void prepare_constant_time_tables(jclass);
 250   static jshort get_interfaces(jclass, _Jv_ifaces *);
 251   static void link_symbol_table(jclass);
 252   static void link_exception_table(jclass);
 253   static void layout_interface_methods(jclass);
 254   static void layout_vtable_methods(jclass);
 255   static void set_vtable_entries(jclass, _Jv_VTable *);
 256   static void make_vtable(jclass);
 257   static void ensure_fields_laid_out(jclass);
 258   static void ensure_class_linked(jclass);
 259   static void ensure_supers_installed(jclass);
 260   static void add_miranda_methods(jclass, jclass);
 261   static void ensure_method_table_complete(jclass);
 262   static void verify_class(jclass);
 263   static jshort find_iindex(jclass *, jshort *, jshort);
 264   static jshort indexof(void *, void **, jshort);
 265   static int get_alignment_from_class(jclass);
 266   static void generate_itable(jclass, _Jv_ifaces *, jshort *);
 267   static jshort append_partial_itable(jclass, jclass, void **, jshort);
 268   static _Jv_Method *search_method_in_class (jclass, jclass,
 269                                              _Jv_Utf8Const *,
 270                                              _Jv_Utf8Const *);
 271
 272 public:
 273
 274   static bool has_field_p (jclass, _Jv_Utf8Const *);
 275   static void print_class_loaded (jclass);
 276   static void resolve_class_ref (jclass, jclass *);
 277   static void wait_for_state(jclass, int);
 278   static _Jv_word resolve_pool_entry (jclass, int);
 279   static void resolve_field (_Jv_Field *, java::lang::ClassLoader *);
 280   static void verify_type_assertions (jclass);
 281 };
 282
 283 /* Type of pointer used as finalizer.  */
 284 typedef void _Jv_FinalizerFunc (jobject);
 285
 286 /* Allocate space for a new Java object.  */
 287 void *_Jv_AllocObj (jsize size, jclass cl) __attribute__((__malloc__));
 288 /* Allocate space for a potentially uninitialized pointer-free object.
 289    Interesting only with JV_HASH_SYNCHRONIZATION.  */
 290 void *_Jv_AllocPtrFreeObj (jsize size, jclass cl) __attribute__((__malloc__));
 291 /* Allocate space for an array of Java objects.  */
 292 void *_Jv_AllocArray (jsize size, jclass cl) __attribute__((__malloc__));
 293 /* Allocate space that is known to be pointer-free.  */
 294 void *_Jv_AllocBytes (jsize size) __attribute__((__malloc__));
 295 /* Allocate space for a new non-Java object, which does not have the usual
 296    Java object header but may contain pointers to other GC'ed objects.  */
 297 void *_Jv_AllocRawObj (jsize size) __attribute__((__malloc__));
 298 /* Explicitly throw an out-of-memory exception. */
 299 void _Jv_ThrowNoMemory() __attribute__((__noreturn__));
 300 /* Allocate an object with a single pointer.  The first word is reserved
 301    for the GC, and the second word is the traced pointer.  */
 302 void *_Jv_AllocTraceOne (jsize size /* incl. reserved slot */);
 303 /* Ditto, but for two traced pointers.                     */
 304 void *_Jv_AllocTraceTwo (jsize size /* incl. reserved slot */);
 305 /* Initialize the GC.  */
 306 void _Jv_InitGC (void);
 307 /* Register a finalizer.  */
 308 void _Jv_RegisterFinalizer (void *object, _Jv_FinalizerFunc *method);
 309 /* Compute the GC descriptor for a class */
 310 void * _Jv_BuildGCDescr(jclass);
 311
 312 /* Allocate some unscanned, unmoveable memory.  Return NULL if out of
 313    memory.  */
 314 void *_Jv_MallocUnchecked (jsize size) __attribute__((__malloc__));
 315
 316 /* Initialize finalizers.  The argument is a function to be called
 317    when a finalizer is ready to be run.  */
 318 void _Jv_GCInitializeFinalizers (void (*notifier) (void));
 319 /* Run finalizers for objects ready to be finalized..  */
 320 void _Jv_RunFinalizers (void);
 321 /* Run all finalizers.  Should be called only before exit.  */
 322 void _Jv_RunAllFinalizers (void);
 323 /* Perform a GC.  */
 324 void _Jv_RunGC (void);
 325 /* Disable and enable GC.  */
 326 void _Jv_DisableGC (void);
 327 void _Jv_EnableGC (void);
 328 /* Register a disappearing link.  This is a field F which should be
 329    cleared when *F is found to be inaccessible.  This is used in the
 330    implementation of java.lang.ref.Reference.  */
 331 void _Jv_GCRegisterDisappearingLink (jobject *objp);
 332 /* Return true if OBJECT should be reclaimed.  This is used to
 333    implement soft references.  */
 334 jboolean _Jv_GCCanReclaimSoftReference (jobject obj);
 335
 336 /* Register a finalizer for a String object.  This is only used by
 337    the intern() implementation.  */
 338 void _Jv_RegisterStringFinalizer (jobject str);
 339 /* This is called to actually finalize a possibly-intern()d String.  */
 340 void _Jv_FinalizeString (jobject str);
 341
 342 /* Return approximation of total size of heap.  */
 343 long _Jv_GCTotalMemory (void);
 344 /* Return approximation of total free memory.  */
 345 long _Jv_GCFreeMemory (void);
 346
 347 /* Set initial heap size.  If SIZE==0, ignore.  Should be run before
 348    _Jv_InitGC.  Not required to have any actual effect.  */
 349 void _Jv_GCSetInitialHeapSize (size_t size);
 350
 351 /* Set maximum heap size.  If SIZE==0, unbounded.  Should be run
 352    before _Jv_InitGC.  Not required to have any actual effect.  */
 353 void _Jv_GCSetMaximumHeapSize (size_t size);
 354
 355 /* External interface to setting the heap size.  Parses ARG (a number
 356    which can optionally have "k" or "m" appended and calls
 357    _Jv_GCSetInitialHeapSize.  */
 358 void _Jv_SetInitialHeapSize (const char *arg);
 359
 360 /* External interface to setting the maximum heap size.  Parses ARG (a
 361    number which can optionally have "k" or "m" appended and calls
 362    _Jv_GCSetMaximumHeapSize.  */
 363 void _Jv_SetMaximumHeapSize (const char *arg);
 364
 365 /* Free the method cache, if one was allocated.  This is only called
 366    during thread deregistration.  */
 367 void _Jv_FreeMethodCache ();
 368
 369 /* Set the stack size for threads.  Parses ARG, a number which can
 370    optionally have "k" or "m" appended.  */
 371 void _Jv_SetStackSize (const char *arg);
 372
 373 extern "C" void JvRunMain (jclass klass, int argc, const char **argv);
 374 void _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 375                   bool is_jar);
 376
 377 void _Jv_RunMain (struct _Jv_VMInitArgs *vm_args, jclass klass,
 378                   const char *name, int argc, const char **argv, bool is_jar);
 379
 380 // Delayed until after _Jv_AllocBytes is declared.
 381 //
 382 // Note that we allocate this as unscanned memory -- the vtables
 383 // are handled specially by the GC.
 384
 385 inline _Jv_VTable *
 386 _Jv_VTable::new_vtable (int count)
 387 {
 388   size_t size = sizeof(_Jv_VTable) + (count - 1) * vtable_elt_size ();
 389   return (_Jv_VTable *) _Jv_AllocBytes (size);
 390 }
 391
 392 // Determine if METH gets an entry in a VTable.
 393 static inline jboolean _Jv_isVirtualMethod (_Jv_Method *meth)
 394 {
 395   using namespace java::lang::reflect;
 396   return (((meth->accflags & (Modifier::STATIC | Modifier::PRIVATE)) == 0)
 397           && meth->name->first() != '<');
 398 }
 399
 400 // This function is used to determine the hash code of an object.
 401 inline jint
 402 _Jv_HashCode (jobject obj)
 403 {
 404   // This was chosen to yield relatively well distributed results on
 405   // both 32- and 64-bit architectures.  Note 0x7fffffff is prime.
 406   // FIXME: we assume sizeof(long) == sizeof(void *).
 407   return (jint) ((unsigned long) obj % 0x7fffffff);
 408 }
 409
 410 // Return a raw pointer to the elements of an array given the array
 411 // and its element type.  You might think we could just pick a single
 412 // array type and use elements() on it, but we can't because we must
 413 // account for alignment of the element type.  When ARRAY is null, we
 414 // obtain the number of bytes taken by the base part of the array.
 415 inline char *
 416 _Jv_GetArrayElementFromElementType (jobject array,
 417                                     jclass element_type)
 418 {
 419   char *elts;
 420   if (element_type == JvPrimClass (byte))
 421     elts = (char *) elements ((jbyteArray) array);
 422   else if (element_type == JvPrimClass (short))
 423     elts = (char *) elements ((jshortArray) array);
 424   else if (element_type == JvPrimClass (int))
 425     elts = (char *) elements ((jintArray) array);
 426   else if (element_type == JvPrimClass (long))
 427     elts = (char *) elements ((jlongArray) array);
 428   else if (element_type == JvPrimClass (boolean))
 429     elts = (char *) elements ((jbooleanArray) array);
 430   else if (element_type == JvPrimClass (char))
 431     elts = (char *) elements ((jcharArray) array);
 432   else if (element_type == JvPrimClass (float))
 433     elts = (char *) elements ((jfloatArray) array);
 434   else if (element_type == JvPrimClass (double))
 435     elts = (char *) elements ((jdoubleArray) array);
 436   else
 437     elts = (char *) elements ((jobjectArray) array);
 438   return elts;
 439 }
 440
 441 extern "C" void _Jv_ThrowBadArrayIndex (jint bad_index)
 442   __attribute__((noreturn));
 443 extern "C" void _Jv_ThrowNullPointerException (void)
 444   __attribute__((noreturn));
 445 extern "C" jobject _Jv_NewArray (jint type, jint size)
 446   __attribute__((__malloc__));
 447 extern "C" jobject _Jv_NewMultiArray (jclass klass, jint dims, ...)
 448   __attribute__((__malloc__));
 449 extern "C" void *_Jv_CheckCast (jclass klass, jobject obj);
 450 extern "C" void *_Jv_LookupInterfaceMethod (jclass klass, Utf8Const *name,
 451                                            Utf8Const *signature);
 452 extern "C" void *_Jv_LookupInterfaceMethodIdx (jclass klass, jclass iface,
 453                                                int meth_idx);
 454 extern "C" void _Jv_CheckArrayStore (jobject array, jobject obj);
 455 extern "C" void _Jv_RegisterClass (jclass klass);
 456 extern "C" void _Jv_RegisterClasses (const jclass *classes);
 457 extern "C" void _Jv_RegisterClasses_Counted (const jclass *classes,
 458                                              size_t count);
 459 extern "C" void _Jv_RegisterResource (void *vptr);
 460 extern void _Jv_UnregisterClass (_Jv_Utf8Const*, java::lang::ClassLoader*);
 461
 462 extern "C" jobject _Jv_UnwrapJNIweakReference (jobject);
 463
 464 extern jclass _Jv_FindClass (_Jv_Utf8Const *name,
 465                              java::lang::ClassLoader *loader);
 466 extern jclass _Jv_FindClassFromSignature (char *,
 467                                           java::lang::ClassLoader *loader,
 468                                           char ** = NULL);
 469 extern void _Jv_GetTypesFromSignature (jmethodID method,
 470                                        jclass declaringClass,
 471                                        JArray<jclass> **arg_types_out,
 472                                        jclass *return_type_out);
 473
 474 extern jboolean _Jv_CheckAccess (jclass self_klass, jclass other_klass,
 475                                  jint flags);
 476
 477 extern jobject _Jv_CallAnyMethodA (jobject obj, jclass return_type,
 478                                    jmethodID meth, jboolean is_constructor,
 479                                    JArray<jclass> *parameter_types,
 480                                    jobjectArray args,
 481                                    jclass iface = NULL);
 482
 483 union jvalue;
 484 extern void _Jv_CallAnyMethodA (jobject obj,
 485                                 jclass return_type,
 486                                 jmethodID meth,
 487                                 jboolean is_constructor,
 488                                 jboolean is_virtual_call,
 489                                 JArray<jclass> *parameter_types,
 490                                 jvalue *args,
 491                                 jvalue *result,
 492                                 jboolean is_jni_call = true,
 493                                 jclass iface = NULL);
 494
 495 extern jobject _Jv_NewMultiArray (jclass, jint ndims, jint* dims)
 496   __attribute__((__malloc__));
 497
 498 extern "C" void _Jv_ThrowAbstractMethodError () __attribute__((__noreturn__));
 499
 500 /* Checked divide subroutines. */
 501 extern "C"
 502 {
 503   jint _Jv_divI (jint, jint);
 504   jint _Jv_remI (jint, jint);
 505   jlong _Jv_divJ (jlong, jlong);
 506   jlong _Jv_remJ (jlong, jlong);
 507 }
 508
 509 /* Get the number of arguments (cf. argc) or 0 if our argument
 510    list was never initialized.  */
 511 extern int _Jv_GetNbArgs (void);
 512
 513 /* Get the specified argument (cf. argv[index]) or "" if either
 514    our argument list was never initialized or the specified index
 515    is out of bounds.  */
 516 extern const char * _Jv_GetSafeArg (int index);
 517
 518 /* Sets our argument list. Can be used by programs with non-standard
 519    entry points.  */
 520 extern void _Jv_SetArgs (int argc, const char **argv);
 521
 522 /* Get the name of the running executable.  */
 523 extern const char *_Jv_ThisExecutable (void);
 524
 525 /* Return a pointer to a symbol in executable or loaded library.  */
 526 void *_Jv_FindSymbolInExecutable (const char *);
 527
 528 /* Initialize JNI.  */
 529 extern void _Jv_JNI_Init (void);
 530
 531 /* Get or set the per-thread JNIEnv used by the invocation API.  */
 532 _Jv_JNIEnv *_Jv_GetCurrentJNIEnv ();
 533 void _Jv_SetCurrentJNIEnv (_Jv_JNIEnv *);
 534
 535 /* Free a JNIEnv. */
 536 void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
 537
 538 /* Free a JNIEnv. */
 539 void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
 540
 541 struct _Jv_JavaVM;
 542 _Jv_JavaVM *_Jv_GetJavaVM ();
 543
 544 // Some verification functions from defineclass.cc.
 545 bool _Jv_VerifyFieldSignature (_Jv_Utf8Const*sig);
 546 bool _Jv_VerifyMethodSignature (_Jv_Utf8Const*sig);
 547 bool _Jv_VerifyClassName (unsigned char* ptr, _Jv_ushort length);
 548 bool _Jv_VerifyClassName (_Jv_Utf8Const *name);
 549 bool _Jv_VerifyIdentifier (_Jv_Utf8Const *);
 550 bool _Jv_ClassNameSamePackage (_Jv_Utf8Const *name1, _Jv_Utf8Const *name2);
 551
 552 struct _Jv_core_chain
 553 {
 554   int name_length;
 555   const char *name;
 556   int data_length;
 557   const void *data;
 558
 559   struct _Jv_core_chain *next;
 560 };
 561
 562 // This is called when new core data is loaded.
 563 extern void (*_Jv_RegisterCoreHook) (_Jv_core_chain *);
 564
 565 _Jv_core_chain *_Jv_FindCore (_Jv_core_chain *node, jstring name);
 566 void _Jv_FreeCoreChain (_Jv_core_chain *chain);
 567
 568 #ifdef ENABLE_JVMPI
 569
 570 #include "jvmpi.h"
 571
 572 extern void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 573 extern void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 574 extern void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 575 #endif
 576
 577 /* FIXME: this should really be defined in some more generic place */
 578 #define ROUND(V, A) (((((unsigned) (V))-1) | ((A)-1))+1)
 579
 580 extern void _Jv_RegisterBootstrapPackages ();
 581
 582 #define FLAG_BINARYCOMPAT_ABI (1<<31)  /* Class is built with the BC-ABI. */
 583
 584 #define FLAG_BOOTSTRAP_LOADER (1<<30)  /* Used when defining a class that
 585                                           should be loaded by the bootstrap
 586                                           loader.  */
 587
 588 // These are used to find ABI versions we recognize.
 589 #define GCJ_CXX_ABI_VERSION (__GNUC__ * 100000 + __GNUC_MINOR__ * 1000)
 590
 591 // This is the old-style BC version ID used by GCJ 4.0.0.
 592 #define OLD_GCJ_40_BC_ABI_VERSION (4 * 10000 + 0 * 10 + 5)
 593
 594 // New style version IDs used by GCJ 4.0.1 and later.
 595 #define GCJ_40_BC_ABI_VERSION (4 * 100000 + 0 * 1000)
 596
 597 inline bool
 598 _Jv_CheckABIVersion (unsigned long value)
 599 {
 600   // We are compatible with GCJ 4.0.0 BC-ABI classes. This release used a
 601   // different format for the version ID string.
 602    if (value == OLD_GCJ_40_BC_ABI_VERSION)
 603      return true;
 604
 605   // The 20 low-end bits are used for the version number.
 606   unsigned long version = value & 0xfffff;
 607
 608   if (value & FLAG_BINARYCOMPAT_ABI)
 609     {
 610       int abi_rev = version % 100;
 611       int abi_ver = version - abi_rev;
 612       if (abi_ver == GCJ_40_BC_ABI_VERSION && abi_rev <= 0)
 613         return true;
 614     }
 615   else
 616     // C++ ABI
 617     return version == GCJ_CXX_ABI_VERSION;
 618
 619   return false;
 620 }
 621
 622 inline bool
 623 _Jv_ClassForBootstrapLoader (unsigned long value)
 624 {
 625   return (value & FLAG_BOOTSTRAP_LOADER);
 626 }
 627
 628 // It makes the source cleaner if we simply always define this
 629 // function.  If the interpreter is not built, it will never return
 630 // 'true'.
 631 extern inline jboolean
 632 _Jv_IsInterpretedClass (jclass c)
 633 {
 634   return (c->accflags & java::lang::reflect::Modifier::INTERPRETED) != 0;
 635 }
 636
 637 // Return true if the class was compiled with the BC ABI.
 638 extern inline jboolean
 639 _Jv_IsBinaryCompatibilityABI (jclass c)
 640 {
 641   // There isn't really a better test for the ABI type at this point,
 642   // that will work once the class has been registered.
 643   return c->otable_syms || c->atable_syms || c->itable_syms;
 644 }
 645
 646 #endif /* __JAVA_JVM_H__ */