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, 2006  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
  76   static _Jv_VTable *new_vtable (int count);
  77 };
  78
  79 union _Jv_word
  80 {
  81   jobject o;
  82   jint i;                       // Also stores smaller integral types.
  83   jfloat f;
  84   jint ia[1];                   // Half of _Jv_word2.
  85   void* p;
  86
  87 #if SIZEOF_VOID_P == 8
  88   // We can safely put a long or a double in here without increasing
  89   // the size of _Jv_Word; we take advantage of this in the interpreter.
  90   jlong l;
  91   jdouble d;
  92 #endif
  93
  94   jclass                     clazz;
  95   jstring                    string;
  96   struct _Jv_Field          *field;
  97   struct _Jv_Utf8Const      *utf8;
  98   struct _Jv_ResolvedMethod *rmethod;
  99 };
 100
 101 union _Jv_word2
 102 {
 103   jint ia[2];
 104   jlong l;
 105   jdouble d;
 106 };
 107
 108 union _Jv_value
 109 {
 110   jbyte byte_value;
 111   jshort short_value;
 112   jchar char_value;
 113   jint int_value;
 114   jlong long_value;
 115   jfloat float_value;
 116   jdouble double_value;
 117   jobject object_value;
 118 };
 119
 120 /* Extract a character from a Java-style Utf8 string.
 121  * PTR points to the current character.
 122  * LIMIT points to the end of the Utf8 string.
 123  * PTR is incremented to point after the character thta gets returns.
 124  * On an error, -1 is returned. */
 125 #define UTF8_GET(PTR, LIMIT) \
 126   ((PTR) >= (LIMIT) ? -1 \
 127    : *(PTR) < 128 ? *(PTR)++ \
 128    : (*(PTR)&0xE0) == 0xC0 && ((PTR)+=2)<=(LIMIT) && ((PTR)[-1]&0xC0) == 0x80 \
 129    ? (((PTR)[-2] & 0x1F) << 6) + ((PTR)[-1] & 0x3F) \
 130    : (*(PTR) & 0xF0) == 0xE0 && ((PTR) += 3) <= (LIMIT) \
 131    && ((PTR)[-2] & 0xC0) == 0x80 && ((PTR)[-1] & 0xC0) == 0x80 \
 132    ? (((PTR)[-3]&0x0F) << 12) + (((PTR)[-2]&0x3F) << 6) + ((PTR)[-1]&0x3F) \
 133    : ((PTR)++, -1))
 134
 135 extern int _Jv_strLengthUtf8(const char* str, int len);
 136
 137 typedef struct _Jv_Utf8Const Utf8Const;
 138 _Jv_Utf8Const *_Jv_makeUtf8Const (const char *s, int len);
 139 _Jv_Utf8Const *_Jv_makeUtf8Const (jstring string);
 140 extern jboolean _Jv_equalUtf8Consts (const _Jv_Utf8Const *, const _Jv_Utf8Const *);
 141 extern jboolean _Jv_equal (_Jv_Utf8Const *, jstring, jint);
 142 extern jboolean _Jv_equaln (_Jv_Utf8Const *, jstring, jint);
 143
 144 /* Helper class which converts a jstring to a temporary char*.
 145    Uses the supplied buffer, if non-null. Otherwise, allocates
 146    the buffer on the heap. Use the JV_TEMP_UTF_STRING macro,
 147    which follows, to automatically allocate a stack buffer if
 148    the string is small enough. */
 149 class _Jv_TempUTFString
 150 {
 151 public:
 152   _Jv_TempUTFString(jstring jstr, char* buf=0);
 153   ~_Jv_TempUTFString();
 154
 155 // Accessors
 156   operator const char*() const
 157   {
 158     return buf_;
 159   }
 160   const char* buf() const
 161   {
 162     return buf_;
 163   }
 164   char* buf()
 165   {
 166     return buf_;
 167   }
 168
 169 private:
 170   char* buf_;
 171   bool heapAllocated_;
 172 };
 173
 174 inline _Jv_TempUTFString::_Jv_TempUTFString (jstring jstr, char* buf)
 175   : buf_(0), heapAllocated_(false)
 176 {
 177   if (!jstr) return;
 178   jsize len = JvGetStringUTFLength (jstr);
 179   if (buf)
 180     buf_ = buf;
 181   else
 182     {
 183       buf_ = (char*) _Jv_Malloc (len+1);
 184       heapAllocated_ = true;
 185     }
 186
 187   JvGetStringUTFRegion (jstr, 0, jstr->length(), buf_);
 188   buf_[len] = '\0';
 189 }
 190
 191 inline _Jv_TempUTFString::~_Jv_TempUTFString ()
 192 {
 193   if (heapAllocated_)
 194     _Jv_Free (buf_);
 195 }
 196
 197 /* Macro which uses _Jv_TempUTFString. Allocates a stack-based
 198    buffer if the string and its null terminator are <= 256
 199    characters in length. Otherwise, a heap-based buffer is
 200    used. The parameters to this macro are the variable name
 201    which is an instance of _Jv_TempUTFString (above) and a
 202    jstring.
 203
 204    Sample Usage:
 205
 206    jstring jstr = getAJString();
 207    JV_TEMP_UTF_STRING(utfstr, jstr);
 208    printf("The string is: %s\n", utfstr.buf());
 209
 210  */
 211 #define JV_TEMP_UTF_STRING(utfstr, jstr) \
 212   jstring utfstr##thejstr = (jstr); \
 213   jsize utfstr##_len = utfstr##thejstr ? JvGetStringUTFLength (utfstr##thejstr) + 1 : 0; \
 214   char utfstr##_buf[utfstr##_len <= 256 ? utfstr##_len : 0]; \
 215   _Jv_TempUTFString utfstr(utfstr##thejstr, sizeof(utfstr##_buf)==0 ? 0 : utfstr##_buf)
 216
 217 namespace gcj
 218 {
 219   /* Some constants used during lookup of special class methods.  */
 220   extern _Jv_Utf8Const *void_signature; /* "()V" */
 221   extern _Jv_Utf8Const *clinit_name;    /* "<clinit>" */
 222   extern _Jv_Utf8Const *init_name;      /* "<init>" */
 223   extern _Jv_Utf8Const *finit_name;     /* "finit$", */
 224
 225   /* Set to true by _Jv_CreateJavaVM. */
 226   extern bool runtimeInitialized;
 227
 228   /* Print out class names as they are initialized. */
 229   extern bool verbose_class_flag;
 230
 231   /* When true, enable the bytecode verifier and BC-ABI verification. */
 232   extern bool verifyClasses;
 233
 234   /* Thread stack size specified by the -Xss runtime argument. */
 235   extern size_t stack_size;
 236
 237   /* The start time */
 238   extern jlong startTime;
 239
 240   /* The VM arguments */
 241   extern JArray<jstring>* vmArgs;
 242
 243 }
 244
 245 // This class handles all aspects of class preparation and linking.
 246 class _Jv_Linker
 247 {
 248 private:
 249   static _Jv_Field *find_field_helper(jclass, _Jv_Utf8Const *, _Jv_Utf8Const *,
 250                                       jclass, jclass *);
 251   static _Jv_Field *find_field(jclass, jclass, jclass *, _Jv_Utf8Const *,
 252                                _Jv_Utf8Const *);
 253   static void prepare_constant_time_tables(jclass);
 254   static jshort get_interfaces(jclass, _Jv_ifaces *);
 255   static void link_symbol_table(jclass);
 256   static void link_exception_table(jclass);
 257   static void layout_interface_methods(jclass);
 258   static void layout_vtable_methods(jclass);
 259   static void set_vtable_entries(jclass, _Jv_VTable *);
 260   static void make_vtable(jclass);
 261   static void ensure_fields_laid_out(jclass);
 262   static void ensure_class_linked(jclass);
 263   static void ensure_supers_installed(jclass);
 264   static void add_miranda_methods(jclass, jclass);
 265   static void ensure_method_table_complete(jclass);
 266   static void verify_class(jclass);
 267   static jshort find_iindex(jclass *, jshort *, jshort);
 268   static jshort indexof(void *, void **, jshort);
 269   static int get_alignment_from_class(jclass);
 270   static void generate_itable(jclass, _Jv_ifaces *, jshort *);
 271   static jshort append_partial_itable(jclass, jclass, void **, jshort);
 272   static _Jv_Method *search_method_in_class (jclass, jclass,
 273                                              _Jv_Utf8Const *,
 274                                              _Jv_Utf8Const *);
 275   static void *create_error_method(_Jv_Utf8Const *);
 276
 277 public:
 278
 279   static bool has_field_p (jclass, _Jv_Utf8Const *);
 280   static void print_class_loaded (jclass);
 281   static void resolve_class_ref (jclass, jclass *);
 282   static void wait_for_state(jclass, int);
 283   static _Jv_Method *resolve_method_entry (jclass, jclass &,
 284                                            int, int,
 285                                            bool, bool);
 286   static _Jv_word resolve_pool_entry (jclass, int, bool =false);
 287   static void resolve_field (_Jv_Field *, java::lang::ClassLoader *);
 288   static void verify_type_assertions (jclass);
 289 };
 290
 291 /* Type of pointer used as finalizer.  */
 292 typedef void _Jv_FinalizerFunc (jobject);
 293
 294 /* Allocate space for a new Java object.  */
 295 void *_Jv_AllocObj (jsize size, jclass cl) __attribute__((__malloc__));
 296 /* Allocate space for a potentially uninitialized pointer-free object.
 297    Interesting only with JV_HASH_SYNCHRONIZATION.  */
 298 void *_Jv_AllocPtrFreeObj (jsize size, jclass cl) __attribute__((__malloc__));
 299 /* Allocate space for an array of Java objects.  */
 300 void *_Jv_AllocArray (jsize size, jclass cl) __attribute__((__malloc__));
 301 /* Allocate space that is known to be pointer-free.  */
 302 void *_Jv_AllocBytes (jsize size) __attribute__((__malloc__));
 303 /* Allocate space for a new non-Java object, which does not have the usual
 304    Java object header but may contain pointers to other GC'ed objects.  */
 305 void *_Jv_AllocRawObj (jsize size) __attribute__((__malloc__));
 306 /* Explicitly throw an out-of-memory exception. */
 307 void _Jv_ThrowNoMemory() __attribute__((__noreturn__));
 308 /* Allocate an object with a single pointer.  The first word is reserved
 309    for the GC, and the second word is the traced pointer.  */
 310 void *_Jv_AllocTraceOne (jsize size /* incl. reserved slot */);
 311 /* Ditto, but for two traced pointers.                     */
 312 void *_Jv_AllocTraceTwo (jsize size /* incl. reserved slot */);
 313 /* Initialize the GC.  */
 314 void _Jv_InitGC (void);
 315 /* Register a finalizer.  */
 316 void _Jv_RegisterFinalizer (void *object, _Jv_FinalizerFunc *method);
 317 /* Compute the GC descriptor for a class */
 318 void * _Jv_BuildGCDescr(jclass);
 319
 320 /* Allocate some unscanned, unmoveable memory.  Return NULL if out of
 321    memory.  */
 322 void *_Jv_MallocUnchecked (jsize size) __attribute__((__malloc__));
 323
 324 /* Initialize finalizers.  The argument is a function to be called
 325    when a finalizer is ready to be run.  */
 326 void _Jv_GCInitializeFinalizers (void (*notifier) (void));
 327 /* Run finalizers for objects ready to be finalized..  */
 328 void _Jv_RunFinalizers (void);
 329 /* Run all finalizers.  Should be called only before exit.  */
 330 void _Jv_RunAllFinalizers (void);
 331 /* Perform a GC.  */
 332 void _Jv_RunGC (void);
 333 /* Disable and enable GC.  */
 334 void _Jv_DisableGC (void);
 335 void _Jv_EnableGC (void);
 336 /* Register a disappearing link.  This is a field F which should be
 337    cleared when *F is found to be inaccessible.  This is used in the
 338    implementation of java.lang.ref.Reference.  */
 339 void _Jv_GCRegisterDisappearingLink (jobject *objp);
 340 /* Return true if OBJECT should be reclaimed.  This is used to
 341    implement soft references.  */
 342 jboolean _Jv_GCCanReclaimSoftReference (jobject obj);
 343
 344 /* Register a finalizer for a String object.  This is only used by
 345    the intern() implementation.  */
 346 void _Jv_RegisterStringFinalizer (jobject str);
 347 /* This is called to actually finalize a possibly-intern()d String.  */
 348 void _Jv_FinalizeString (jobject str);
 349
 350 /* Return approximation of total size of heap.  */
 351 long _Jv_GCTotalMemory (void);
 352 /* Return approximation of total free memory.  */
 353 long _Jv_GCFreeMemory (void);
 354
 355 /* Set initial heap size.  If SIZE==0, ignore.  Should be run before
 356    _Jv_InitGC.  Not required to have any actual effect.  */
 357 void _Jv_GCSetInitialHeapSize (size_t size);
 358
 359 /* Set maximum heap size.  If SIZE==0, unbounded.  Should be run
 360    before _Jv_InitGC.  Not required to have any actual effect.  */
 361 void _Jv_GCSetMaximumHeapSize (size_t size);
 362
 363 /* External interface to setting the heap size.  Parses ARG (a number
 364    which can optionally have "k" or "m" appended and calls
 365    _Jv_GCSetInitialHeapSize.  */
 366 void _Jv_SetInitialHeapSize (const char *arg);
 367
 368 /* External interface to setting the maximum heap size.  Parses ARG (a
 369    number which can optionally have "k" or "m" appended and calls
 370    _Jv_GCSetMaximumHeapSize.  */
 371 void _Jv_SetMaximumHeapSize (const char *arg);
 372
 373 /* Free the method cache, if one was allocated.  This is only called
 374    during thread deregistration.  */
 375 void _Jv_FreeMethodCache ();
 376
 377 /* Set the stack size for threads.  Parses ARG, a number which can
 378    optionally have "k" or "m" appended.  */
 379 void _Jv_SetStackSize (const char *arg);
 380
 381 extern "C" void JvRunMain (jclass klass, int argc, const char **argv);
 382 void _Jv_RunMain (jclass klass, const char *name, int argc, const char **argv,
 383                   bool is_jar);
 384
 385 void _Jv_RunMain (struct _Jv_VMInitArgs *vm_args, jclass klass,
 386                   const char *name, int argc, const char **argv, bool is_jar);
 387
 388 // Delayed until after _Jv_AllocRawObj is declared.
 389 inline _Jv_VTable *
 390 _Jv_VTable::new_vtable (int count)
 391 {
 392   size_t size = sizeof(_Jv_VTable) + (count - 1) * vtable_elt_size ();
 393   return (_Jv_VTable *) _Jv_AllocRawObj (size);
 394 }
 395
 396 // Determine if METH gets an entry in a VTable.
 397 static inline jboolean _Jv_isVirtualMethod (_Jv_Method *meth)
 398 {
 399   using namespace java::lang::reflect;
 400   return (((meth->accflags & (Modifier::STATIC | Modifier::PRIVATE)) == 0)
 401           && meth->name->first() != '<');
 402 }
 403
 404 // This function is used to determine the hash code of an object.
 405 inline jint
 406 _Jv_HashCode (jobject obj)
 407 {
 408   // This was chosen to yield relatively well distributed results on
 409   // both 32- and 64-bit architectures.  Note 0x7fffffff is prime.
 410   // FIXME: we assume sizeof(long) == sizeof(void *).
 411   return (jint) ((unsigned long) obj % 0x7fffffff);
 412 }
 413
 414 // Return a raw pointer to the elements of an array given the array
 415 // and its element type.  You might think we could just pick a single
 416 // array type and use elements() on it, but we can't because we must
 417 // account for alignment of the element type.  When ARRAY is null, we
 418 // obtain the number of bytes taken by the base part of the array.
 419 inline char *
 420 _Jv_GetArrayElementFromElementType (jobject array,
 421                                     jclass element_type)
 422 {
 423   char *elts;
 424   if (element_type == JvPrimClass (byte))
 425     elts = (char *) elements ((jbyteArray) array);
 426   else if (element_type == JvPrimClass (short))
 427     elts = (char *) elements ((jshortArray) array);
 428   else if (element_type == JvPrimClass (int))
 429     elts = (char *) elements ((jintArray) array);
 430   else if (element_type == JvPrimClass (long))
 431     elts = (char *) elements ((jlongArray) array);
 432   else if (element_type == JvPrimClass (boolean))
 433     elts = (char *) elements ((jbooleanArray) array);
 434   else if (element_type == JvPrimClass (char))
 435     elts = (char *) elements ((jcharArray) array);
 436   else if (element_type == JvPrimClass (float))
 437     elts = (char *) elements ((jfloatArray) array);
 438   else if (element_type == JvPrimClass (double))
 439     elts = (char *) elements ((jdoubleArray) array);
 440   else
 441     elts = (char *) elements ((jobjectArray) array);
 442   return elts;
 443 }
 444
 445 extern "C" void _Jv_ThrowBadArrayIndex (jint bad_index)
 446   __attribute__((noreturn));
 447 extern "C" void _Jv_ThrowNullPointerException (void)
 448   __attribute__((noreturn));
 449 extern "C" void _Jv_ThrowNoSuchMethodError (void)
 450   __attribute__((noreturn));
 451 extern "C" void _Jv_ThrowNoSuchFieldError (int)
 452   __attribute__((noreturn));
 453 extern "C" jobject _Jv_NewArray (jint type, jint size)
 454   __attribute__((__malloc__));
 455 extern "C" jobject _Jv_NewMultiArray (jclass klass, jint dims, ...)
 456   __attribute__((__malloc__));
 457 extern "C" void *_Jv_CheckCast (jclass klass, jobject obj);
 458 extern "C" void *_Jv_LookupInterfaceMethod (jclass klass, Utf8Const *name,
 459                                            Utf8Const *signature);
 460 extern "C" void *_Jv_LookupInterfaceMethodIdx (jclass klass, jclass iface,
 461                                                int meth_idx);
 462 extern "C" void _Jv_CheckArrayStore (jobject array, jobject obj);
 463 extern "C" void _Jv_RegisterClass (jclass klass);
 464 extern "C" void _Jv_RegisterClasses (const jclass *classes);
 465 extern "C" void _Jv_RegisterClasses_Counted (const jclass *classes,
 466                                              size_t count);
 467 extern "C" void _Jv_RegisterResource (void *vptr);
 468 extern void _Jv_UnregisterClass (_Jv_Utf8Const*, java::lang::ClassLoader*);
 469
 470 extern "C" jobject _Jv_UnwrapJNIweakReference (jobject);
 471
 472 extern jclass _Jv_FindClass (_Jv_Utf8Const *name,
 473                              java::lang::ClassLoader *loader);
 474
 475 extern jclass _Jv_FindClassNoException (_Jv_Utf8Const *name,
 476                              java::lang::ClassLoader *loader);
 477
 478 extern jclass _Jv_FindClassFromSignature (char *,
 479                                           java::lang::ClassLoader *loader,
 480                                           char ** = NULL);
 481
 482 extern jclass _Jv_FindClassFromSignatureNoException (char *,
 483                                           java::lang::ClassLoader *loader,
 484                                           char ** = NULL);
 485
 486 extern void _Jv_GetTypesFromSignature (jmethodID method,
 487                                        jclass declaringClass,
 488                                        JArray<jclass> **arg_types_out,
 489                                        jclass *return_type_out);
 490
 491 extern jboolean _Jv_CheckAccess (jclass self_klass, jclass other_klass,
 492                                  jint flags);
 493
 494 extern jobject _Jv_CallAnyMethodA (jobject obj, jclass return_type,
 495                                    jmethodID meth, jboolean is_constructor,
 496                                    JArray<jclass> *parameter_types,
 497                                    jobjectArray args,
 498                                    jclass iface = NULL);
 499
 500 union jvalue;
 501 extern void _Jv_CallAnyMethodA (jobject obj,
 502                                 jclass return_type,
 503                                 jmethodID meth,
 504                                 jboolean is_constructor,
 505                                 jboolean is_virtual_call,
 506                                 JArray<jclass> *parameter_types,
 507                                 jvalue *args,
 508                                 jvalue *result,
 509                                 jboolean is_jni_call = true,
 510                                 jclass iface = NULL);
 511
 512 extern jobject _Jv_NewMultiArray (jclass, jint ndims, jint* dims)
 513   __attribute__((__malloc__));
 514
 515 extern "C" void _Jv_ThrowAbstractMethodError () __attribute__((__noreturn__));
 516
 517 /* Checked divide subroutines. */
 518 extern "C"
 519 {
 520   jint _Jv_divI (jint, jint);
 521   jint _Jv_remI (jint, jint);
 522   jlong _Jv_divJ (jlong, jlong);
 523   jlong _Jv_remJ (jlong, jlong);
 524 }
 525
 526 /* Get the number of arguments (cf. argc) or 0 if our argument
 527    list was never initialized.  */
 528 extern int _Jv_GetNbArgs (void);
 529
 530 /* Get the specified argument (cf. argv[index]) or "" if either
 531    our argument list was never initialized or the specified index
 532    is out of bounds.  */
 533 extern const char * _Jv_GetSafeArg (int index);
 534
 535 /* Sets our argument list. Can be used by programs with non-standard
 536    entry points.  */
 537 extern void _Jv_SetArgs (int argc, const char **argv);
 538
 539 /* Get the name of the running executable.  */
 540 extern const char *_Jv_ThisExecutable (void);
 541
 542 /* Return a pointer to a symbol in executable or loaded library.  */
 543 void *_Jv_FindSymbolInExecutable (const char *);
 544
 545 /* Initialize JNI.  */
 546 extern void _Jv_JNI_Init (void);
 547
 548 /* Get or set the per-thread JNIEnv used by the invocation API.  */
 549 _Jv_JNIEnv *_Jv_GetCurrentJNIEnv ();
 550 void _Jv_SetCurrentJNIEnv (_Jv_JNIEnv *);
 551
 552 /* Free a JNIEnv. */
 553 void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
 554
 555 /* Free a JNIEnv. */
 556 void _Jv_FreeJNIEnv (_Jv_JNIEnv *);
 557
 558 struct _Jv_JavaVM;
 559 _Jv_JavaVM *_Jv_GetJavaVM ();
 560
 561 // Some verification functions from defineclass.cc.
 562 bool _Jv_VerifyFieldSignature (_Jv_Utf8Const*sig);
 563 bool _Jv_VerifyMethodSignature (_Jv_Utf8Const*sig);
 564 bool _Jv_VerifyClassName (unsigned char* ptr, _Jv_ushort length);
 565 bool _Jv_VerifyClassName (_Jv_Utf8Const *name);
 566 bool _Jv_VerifyIdentifier (_Jv_Utf8Const *);
 567 bool _Jv_ClassNameSamePackage (_Jv_Utf8Const *name1, _Jv_Utf8Const *name2);
 568
 569 struct _Jv_core_chain
 570 {
 571   int name_length;
 572   const char *name;
 573   int data_length;
 574   const void *data;
 575
 576   struct _Jv_core_chain *next;
 577 };
 578
 579 // This is called when new core data is loaded.
 580 extern void (*_Jv_RegisterCoreHook) (_Jv_core_chain *);
 581
 582 _Jv_core_chain *_Jv_FindCore (_Jv_core_chain *node, jstring name);
 583 void _Jv_FreeCoreChain (_Jv_core_chain *chain);
 584
 585 #ifdef ENABLE_JVMPI
 586
 587 #include "jvmpi.h"
 588
 589 extern void (*_Jv_JVMPI_Notify_OBJECT_ALLOC) (JVMPI_Event *event);
 590 extern void (*_Jv_JVMPI_Notify_THREAD_START) (JVMPI_Event *event);
 591 extern void (*_Jv_JVMPI_Notify_THREAD_END) (JVMPI_Event *event);
 592 #endif
 593
 594 /* FIXME: this should really be defined in some more generic place */
 595 #define ROUND(V, A) (((((unsigned) (V))-1) | ((A)-1))+1)
 596
 597 extern void _Jv_RegisterBootstrapPackages ();
 598
 599 #define FLAG_BINARYCOMPAT_ABI (1<<31)  /* Class is built with the BC-ABI. */
 600
 601 #define FLAG_BOOTSTRAP_LOADER (1<<30)  /* Used when defining a class that
 602                                           should be loaded by the bootstrap
 603                                           loader.  */
 604
 605 // These are used to find ABI versions we recognize.
 606 #define GCJ_CXX_ABI_VERSION (__GNUC__ * 100000 + __GNUC_MINOR__ * 1000)
 607
 608 // This is the old-style BC version ID used by GCJ 4.0.0.
 609 #define OLD_GCJ_40_BC_ABI_VERSION (4 * 10000 + 0 * 10 + 5)
 610
 611 // New style version IDs used by GCJ 4.0.1 and later.
 612 #define GCJ_40_BC_ABI_VERSION (4 * 100000 + 0 * 1000)
 613
 614 inline bool
 615 _Jv_CheckABIVersion (unsigned long value)
 616 {
 617   // We are compatible with GCJ 4.0.0 BC-ABI classes. This release used a
 618   // different format for the version ID string.
 619    if (value == OLD_GCJ_40_BC_ABI_VERSION)
 620      return true;
 621
 622   // The 20 low-end bits are used for the version number.
 623   unsigned long version = value & 0xfffff;
 624
 625   if (value & FLAG_BINARYCOMPAT_ABI)
 626     {
 627       int abi_rev = version % 100;
 628       int abi_ver = version - abi_rev;
 629       if (abi_ver == GCJ_40_BC_ABI_VERSION && abi_rev <= 0)
 630         return true;
 631     }
 632   else
 633     // C++ ABI
 634     return version == GCJ_CXX_ABI_VERSION;
 635
 636   return false;
 637 }
 638
 639 inline bool
 640 _Jv_ClassForBootstrapLoader (unsigned long value)
 641 {
 642   return (value & FLAG_BOOTSTRAP_LOADER);
 643 }
 644
 645 // It makes the source cleaner if we simply always define this
 646 // function.  If the interpreter is not built, it will never return
 647 // 'true'.
 648 extern inline jboolean
 649 _Jv_IsInterpretedClass (jclass c)
 650 {
 651   return (c->accflags & java::lang::reflect::Modifier::INTERPRETED) != 0;
 652 }
 653
 654 // Return true if the class was compiled with the BC ABI.
 655 extern inline jboolean
 656 _Jv_IsBinaryCompatibilityABI (jclass c)
 657 {
 658   // There isn't really a better test for the ABI type at this point,
 659   // that will work once the class has been registered.
 660   return c->otable_syms || c->atable_syms || c->itable_syms;
 661 }
 662
 663 // Returns whether the given class does not really exists (ie. we have no
 664 // bytecode) but still allows us to do some very conservative actions.
 665 // E.g. throwing a NoClassDefFoundError with the name of the missing
 666 // class.
 667 extern inline jboolean
 668 _Jv_IsPhantomClass (jclass c)
 669 {
 670   return c->state == JV_STATE_PHANTOM;
 671 }
 672
 673 // A helper function defined in prims.cc.
 674 char* _Jv_PrependVersionedLibdir (char* libpath);
 675
 676 #endif /* __JAVA_JVM_H__ */