libjava/jni.cc

   1 // jni.cc - JNI implementation, including the jump table.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
   4    Free Software Foundation
   5
   6    This file is part of libgcj.
   7
   8 This software is copyrighted work licensed under the terms of the
   9 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
  10 details.  */
  11
  12 #include <config.h>
  13
  14 #include <stdio.h>
  15 #include <stddef.h>
  16 #include <string.h>
  17
  18 #include <gcj/cni.h>
  19 #include <jvm.h>
  20 #include <java-assert.h>
  21 #include <jni.h>
  22 #ifdef ENABLE_JVMPI
  23 #include <jvmpi.h>
  24 #endif
  25
  26 #include <java/lang/Class.h>
  27 #include <java/lang/ClassLoader.h>
  28 #include <java/lang/Throwable.h>
  29 #include <java/lang/ArrayIndexOutOfBoundsException.h>
  30 #include <java/lang/StringIndexOutOfBoundsException.h>
  31 #include <java/lang/StringBuffer.h>
  32 #include <java/lang/UnsatisfiedLinkError.h>
  33 #include <java/lang/InstantiationException.h>
  34 #include <java/lang/NoSuchFieldError.h>
  35 #include <java/lang/NoSuchMethodError.h>
  36 #include <java/lang/reflect/Constructor.h>
  37 #include <java/lang/reflect/Method.h>
  38 #include <java/lang/reflect/Modifier.h>
  39 #include <java/lang/OutOfMemoryError.h>
  40 #include <java/lang/Integer.h>
  41 #include <java/lang/ThreadGroup.h>
  42 #include <java/lang/Thread.h>
  43 #include <java/lang/IllegalAccessError.h>
  44 #include <java/nio/DirectByteBufferImpl.h>
  45 #include <java/util/IdentityHashMap.h>
  46 #include <gnu/gcj/RawData.h>
  47
  48 #include <gcj/method.h>
  49 #include <gcj/field.h>
  50
  51 #include <java-interp.h>
  52 #include <java-threads.h>
  53
  54 using namespace gcj;
  55
  56 // This enum is used to select different template instantiations in
  57 // the invocation code.
  58 enum invocation_type
  59 {
  60   normal,
  61   nonvirtual,
  62   static_type,
  63   constructor
  64 };
  65
  66 // Forward declarations.
  67 extern struct JNINativeInterface _Jv_JNIFunctions;
  68 extern struct JNIInvokeInterface _Jv_JNI_InvokeFunctions;
  69
  70 // Number of slots in the default frame.  The VM must allow at least
  71 // 16.
  72 #define FRAME_SIZE 32
  73
  74 // Mark value indicating this is an overflow frame.
  75 #define MARK_NONE    0
  76 // Mark value indicating this is a user frame.
  77 #define MARK_USER    1
  78 // Mark value indicating this is a system frame.
  79 #define MARK_SYSTEM  2
  80
  81 // This structure is used to keep track of local references.
  82 struct _Jv_JNI_LocalFrame
  83 {
  84   // This is true if this frame object represents a pushed frame (eg
  85   // from PushLocalFrame).
  86   int marker :  2;
  87
  88   // Number of elements in frame.
  89   int size   : 30;
  90
  91   // Next frame in chain.
  92   _Jv_JNI_LocalFrame *next;
  93
  94   // The elements.  These are allocated using the C "struct hack".
  95   jobject vec[0];
  96 };
  97
  98 // This holds a reference count for all local references.
  99 static java::util::IdentityHashMap *local_ref_table;
 100 // This holds a reference count for all global references.
 101 static java::util::IdentityHashMap *global_ref_table;
 102
 103 // The only VM.
 104 static JavaVM *the_vm;
 105
 106 #ifdef ENABLE_JVMPI
 107 // The only JVMPI interface description.
 108 static JVMPI_Interface _Jv_JVMPI_Interface;
 109
 110 static jint
 111 jvmpiEnableEvent (jint event_type, void *)
 112 {
 113   switch (event_type)
 114     {
 115     case JVMPI_EVENT_OBJECT_ALLOC:
 116       _Jv_JVMPI_Notify_OBJECT_ALLOC = _Jv_JVMPI_Interface.NotifyEvent;
 117       break;
 118
 119     case JVMPI_EVENT_THREAD_START:
 120       _Jv_JVMPI_Notify_THREAD_START = _Jv_JVMPI_Interface.NotifyEvent;
 121       break;
 122
 123     case JVMPI_EVENT_THREAD_END:
 124       _Jv_JVMPI_Notify_THREAD_END = _Jv_JVMPI_Interface.NotifyEvent;
 125       break;
 126
 127     default:
 128       return JVMPI_NOT_AVAILABLE;
 129     }
 130
 131   return JVMPI_SUCCESS;
 132 }
 133
 134 static jint
 135 jvmpiDisableEvent (jint event_type, void *)
 136 {
 137   switch (event_type)
 138     {
 139     case JVMPI_EVENT_OBJECT_ALLOC:
 140       _Jv_JVMPI_Notify_OBJECT_ALLOC = NULL;
 141       break;
 142
 143     default:
 144       return JVMPI_NOT_AVAILABLE;
 145     }
 146
 147   return JVMPI_SUCCESS;
 148 }
 149 #endif
 150
 151 \f
 152
 153 void
 154 _Jv_JNI_Init (void)
 155 {
 156   local_ref_table = new java::util::IdentityHashMap;
 157   global_ref_table = new java::util::IdentityHashMap;
 158
 159 #ifdef ENABLE_JVMPI
 160   _Jv_JVMPI_Interface.version = 1;
 161   _Jv_JVMPI_Interface.EnableEvent = &jvmpiEnableEvent;
 162   _Jv_JVMPI_Interface.DisableEvent = &jvmpiDisableEvent;
 163   _Jv_JVMPI_Interface.EnableGC = &_Jv_EnableGC;
 164   _Jv_JVMPI_Interface.DisableGC = &_Jv_DisableGC;
 165   _Jv_JVMPI_Interface.RunGC = &_Jv_RunGC;
 166 #endif
 167 }
 168
 169 // Tell the GC that a certain pointer is live.
 170 static void
 171 mark_for_gc (jobject obj, java::util::IdentityHashMap *ref_table)
 172 {
 173   JvSynchronize sync (ref_table);
 174
 175   using namespace java::lang;
 176   Integer *refcount = (Integer *) ref_table->get (obj);
 177   jint val = (refcount == NULL) ? 0 : refcount->intValue ();
 178   // FIXME: what about out of memory error?
 179   ref_table->put (obj, new Integer (val + 1));
 180 }
 181
 182 // Unmark a pointer.
 183 static void
 184 unmark_for_gc (jobject obj, java::util::IdentityHashMap *ref_table)
 185 {
 186   JvSynchronize sync (ref_table);
 187
 188   using namespace java::lang;
 189   Integer *refcount = (Integer *) ref_table->get (obj);
 190   JvAssert (refcount);
 191   jint val = refcount->intValue () - 1;
 192   JvAssert (val >= 0);
 193   if (val == 0)
 194     ref_table->remove (obj);
 195   else
 196     // FIXME: what about out of memory error?
 197     ref_table->put (obj, new Integer (val));
 198 }
 199
 200 // "Unwrap" some random non-reference type.  This exists to simplify
 201 // other template functions.
 202 template<typename T>
 203 static T
 204 unwrap (T val)
 205 {
 206   return val;
 207 }
 208
 209 // Unwrap a weak reference, if required.
 210 template<typename T>
 211 static T *
 212 unwrap (T *obj)
 213 {
 214   using namespace gnu::gcj::runtime;
 215   // We can compare the class directly because JNIWeakRef is `final'.
 216   // Doing it this way is much faster.
 217   if (obj == NULL || obj->getClass () != &JNIWeakRef::class$)
 218     return obj;
 219   JNIWeakRef *wr = reinterpret_cast<JNIWeakRef *> (obj);
 220   return reinterpret_cast<T *> (wr->get ());
 221 }
 222
 223 \f
 224
 225 static jobject JNICALL
 226 _Jv_JNI_NewGlobalRef (JNIEnv *, jobject obj)
 227 {
 228   // This seems weird but I think it is correct.
 229   obj = unwrap (obj);
 230   mark_for_gc (obj, global_ref_table);
 231   return obj;
 232 }
 233
 234 static void JNICALL
 235 _Jv_JNI_DeleteGlobalRef (JNIEnv *, jobject obj)
 236 {
 237   // This seems weird but I think it is correct.
 238   obj = unwrap (obj);
 239   unmark_for_gc (obj, global_ref_table);
 240 }
 241
 242 static void JNICALL
 243 _Jv_JNI_DeleteLocalRef (JNIEnv *env, jobject obj)
 244 {
 245   _Jv_JNI_LocalFrame *frame;
 246
 247   // This seems weird but I think it is correct.
 248   obj = unwrap (obj);
 249
 250   for (frame = env->locals; frame != NULL; frame = frame->next)
 251     {
 252       for (int i = 0; i < frame->size; ++i)
 253         {
 254           if (frame->vec[i] == obj)
 255             {
 256               frame->vec[i] = NULL;
 257               unmark_for_gc (obj, local_ref_table);
 258               return;
 259             }
 260         }
 261
 262       // Don't go past a marked frame.
 263       JvAssert (frame->marker == MARK_NONE);
 264     }
 265
 266   JvAssert (0);
 267 }
 268
 269 static jint JNICALL
 270 _Jv_JNI_EnsureLocalCapacity (JNIEnv *env, jint size)
 271 {
 272   // It is easier to just always allocate a new frame of the requested
 273   // size.  This isn't the most efficient thing, but for now we don't
 274   // care.  Note that _Jv_JNI_PushLocalFrame relies on this right now.
 275
 276   _Jv_JNI_LocalFrame *frame;
 277   try
 278     {
 279       frame = (_Jv_JNI_LocalFrame *) _Jv_Malloc (sizeof (_Jv_JNI_LocalFrame)
 280                                                  + size * sizeof (jobject));
 281     }
 282   catch (jthrowable t)
 283     {
 284       env->ex = t;
 285       return JNI_ERR;
 286     }
 287
 288   frame->marker = MARK_NONE;
 289   frame->size = size;
 290   memset (&frame->vec[0], 0, size * sizeof (jobject));
 291   frame->next = env->locals;
 292   env->locals = frame;
 293
 294   return 0;
 295 }
 296
 297 static jint JNICALL
 298 _Jv_JNI_PushLocalFrame (JNIEnv *env, jint size)
 299 {
 300   jint r = _Jv_JNI_EnsureLocalCapacity (env, size);
 301   if (r < 0)
 302     return r;
 303
 304   // The new frame is on top.
 305   env->locals->marker = MARK_USER;
 306
 307   return 0;
 308 }
 309
 310 static jobject JNICALL
 311 _Jv_JNI_NewLocalRef (JNIEnv *env, jobject obj)
 312 {
 313   // This seems weird but I think it is correct.
 314   obj = unwrap (obj);
 315
 316   // Try to find an open slot somewhere in the topmost frame.
 317   _Jv_JNI_LocalFrame *frame = env->locals;
 318   bool done = false, set = false;
 319   for (; frame != NULL && ! done; frame = frame->next)
 320     {
 321       for (int i = 0; i < frame->size; ++i)
 322         {
 323           if (frame->vec[i] == NULL)
 324             {
 325               set = true;
 326               done = true;
 327               frame->vec[i] = obj;
 328               break;
 329             }
 330         }
 331
 332       // If we found a slot, or if the frame we just searched is the
 333       // mark frame, then we are done.
 334       if (done || frame == NULL || frame->marker != MARK_NONE)
 335         break;
 336     }
 337
 338   if (! set)
 339     {
 340       // No slots, so we allocate a new frame.  According to the spec
 341       // we could just die here.  FIXME: return value.
 342       _Jv_JNI_EnsureLocalCapacity (env, 16);
 343       // We know the first element of the new frame will be ok.
 344       env->locals->vec[0] = obj;
 345     }
 346
 347   mark_for_gc (obj, local_ref_table);
 348   return obj;
 349 }
 350
 351 static jobject JNICALL
 352 _Jv_JNI_PopLocalFrame (JNIEnv *env, jobject result, int stop)
 353 {
 354   _Jv_JNI_LocalFrame *rf = env->locals;
 355
 356   bool done = false;
 357   while (rf != NULL && ! done)
 358     {
 359       for (int i = 0; i < rf->size; ++i)
 360         if (rf->vec[i] != NULL)
 361           unmark_for_gc (rf->vec[i], local_ref_table);
 362
 363       // If the frame we just freed is the marker frame, we are done.
 364       done = (rf->marker == stop);
 365
 366       _Jv_JNI_LocalFrame *n = rf->next;
 367       // When N==NULL, we've reached the stack-allocated frame, and we
 368       // must not free it.  However, we must be sure to clear all its
 369       // elements, since we might conceivably reuse it.
 370       if (n == NULL)
 371         {
 372           memset (&rf->vec[0], 0, rf->size * sizeof (jobject));
 373           break;
 374         }
 375
 376       _Jv_Free (rf);
 377       rf = n;
 378     }
 379
 380   // Update the local frame information.
 381   env->locals = rf;
 382
 383   return result == NULL ? NULL : _Jv_JNI_NewLocalRef (env, result);
 384 }
 385
 386 static jobject JNICALL
 387 _Jv_JNI_PopLocalFrame (JNIEnv *env, jobject result)
 388 {
 389   return _Jv_JNI_PopLocalFrame (env, result, MARK_USER);
 390 }
 391
 392 // Make sure an array's type is compatible with the type of the
 393 // destination.
 394 template<typename T>
 395 static bool
 396 _Jv_JNI_check_types (JNIEnv *env, JArray<T> *array, jclass K)
 397 {
 398   jclass klass = array->getClass()->getComponentType();
 399   if (__builtin_expect (klass != K, false))
 400     {
 401       env->ex = new java::lang::IllegalAccessError ();
 402       return false;
 403     }
 404   else
 405     return true;
 406 }
 407
 408 // Pop a `system' frame from the stack.  This is `extern "C"' as it is
 409 // used by the compiler.
 410 extern "C" void
 411 _Jv_JNI_PopSystemFrame (JNIEnv *env)
 412 {
 413   _Jv_JNI_PopLocalFrame (env, NULL, MARK_SYSTEM);
 414
 415   if (env->ex)
 416     {
 417       jthrowable t = env->ex;
 418       env->ex = NULL;
 419       throw t;
 420     }
 421 }
 422
 423 template<typename T> T extract_from_jvalue(jvalue const & t);
 424 template<> jboolean extract_from_jvalue(jvalue const & jv) { return jv.z; }
 425 template<> jbyte    extract_from_jvalue(jvalue const & jv) { return jv.b; }
 426 template<> jchar    extract_from_jvalue(jvalue const & jv) { return jv.c; }
 427 template<> jshort   extract_from_jvalue(jvalue const & jv) { return jv.s; }
 428 template<> jint     extract_from_jvalue(jvalue const & jv) { return jv.i; }
 429 template<> jlong    extract_from_jvalue(jvalue const & jv) { return jv.j; }
 430 template<> jfloat   extract_from_jvalue(jvalue const & jv) { return jv.f; }
 431 template<> jdouble  extract_from_jvalue(jvalue const & jv) { return jv.d; }
 432 template<> jobject  extract_from_jvalue(jvalue const & jv) { return jv.l; }
 433
 434
 435 // This function is used from other template functions.  It wraps the
 436 // return value appropriately; we specialize it so that object returns
 437 // are turned into local references.
 438 template<typename T>
 439 static T
 440 wrap_value (JNIEnv *, T value)
 441 {
 442   return value;
 443 }
 444
 445 // This specialization is used for jobject, jclass, jstring, jarray,
 446 // etc.
 447 template<typename R, typename T>
 448 static T *
 449 wrap_value (JNIEnv *env, T *value)
 450 {
 451   return (value == NULL
 452           ? value
 453           : (T *) _Jv_JNI_NewLocalRef (env, (jobject) value));
 454 }
 455
 456 \f
 457
 458 static jint JNICALL
 459 _Jv_JNI_GetVersion (JNIEnv *)
 460 {
 461   return JNI_VERSION_1_4;
 462 }
 463
 464 static jclass JNICALL
 465 _Jv_JNI_DefineClass (JNIEnv *env, const char *name, jobject loader,
 466                      const jbyte *buf, jsize bufLen)
 467 {
 468   try
 469     {
 470       loader = unwrap (loader);
 471
 472       jstring sname = JvNewStringUTF (name);
 473       jbyteArray bytes = JvNewByteArray (bufLen);
 474
 475       jbyte *elts = elements (bytes);
 476       memcpy (elts, buf, bufLen * sizeof (jbyte));
 477
 478       java::lang::ClassLoader *l
 479         = reinterpret_cast<java::lang::ClassLoader *> (loader);
 480
 481       jclass result = l->defineClass (sname, bytes, 0, bufLen);
 482       return (jclass) wrap_value (env, result);
 483     }
 484   catch (jthrowable t)
 485     {
 486       env->ex = t;
 487       return NULL;
 488     }
 489 }
 490
 491 static jclass JNICALL
 492 _Jv_JNI_FindClass (JNIEnv *env, const char *name)
 493 {
 494   // FIXME: assume that NAME isn't too long.
 495   int len = strlen (name);
 496   char s[len + 1];
 497   for (int i = 0; i <= len; ++i)
 498     s[i] = (name[i] == '/') ? '.' : name[i];
 499
 500   jclass r = NULL;
 501   try
 502     {
 503       // This might throw an out of memory exception.
 504       jstring n = JvNewStringUTF (s);
 505
 506       java::lang::ClassLoader *loader = NULL;
 507       if (env->klass != NULL)
 508         loader = env->klass->getClassLoaderInternal ();
 509
 510       if (loader == NULL)
 511         {
 512           // FIXME: should use getBaseClassLoader, but we don't have that
 513           // yet.
 514           loader = java::lang::ClassLoader::getSystemClassLoader ();
 515         }
 516
 517       r = loader->loadClass (n);
 518     }
 519   catch (jthrowable t)
 520     {
 521       env->ex = t;
 522     }
 523
 524   return (jclass) wrap_value (env, r);
 525 }
 526
 527 static jclass JNICALL
 528 _Jv_JNI_GetSuperclass (JNIEnv *env, jclass clazz)
 529 {
 530   return (jclass) wrap_value (env, unwrap (clazz)->getSuperclass ());
 531 }
 532
 533 static jboolean JNICALL
 534 _Jv_JNI_IsAssignableFrom (JNIEnv *, jclass clazz1, jclass clazz2)
 535 {
 536   return unwrap (clazz1)->isAssignableFrom (unwrap (clazz2));
 537 }
 538
 539 static jint JNICALL
 540 _Jv_JNI_Throw (JNIEnv *env, jthrowable obj)
 541 {
 542   // We check in case the user did some funky cast.
 543   obj = unwrap (obj);
 544   JvAssert (obj != NULL && java::lang::Throwable::class$.isInstance (obj));
 545   env->ex = obj;
 546   return 0;
 547 }
 548
 549 static jint JNICALL
 550 _Jv_JNI_ThrowNew (JNIEnv *env, jclass clazz, const char *message)
 551 {
 552   using namespace java::lang::reflect;
 553
 554   clazz = unwrap (clazz);
 555   JvAssert (java::lang::Throwable::class$.isAssignableFrom (clazz));
 556
 557   int r = JNI_OK;
 558   try
 559     {
 560       JArray<jclass> *argtypes
 561         = (JArray<jclass> *) JvNewObjectArray (1, &java::lang::Class::class$,
 562                                                NULL);
 563
 564       jclass *elts = elements (argtypes);
 565       elts[0] = &StringClass;
 566
 567       Constructor *cons = clazz->getConstructor (argtypes);
 568
 569       jobjectArray values = JvNewObjectArray (1, &StringClass, NULL);
 570       jobject *velts = elements (values);
 571       velts[0] = JvNewStringUTF (message);
 572
 573       jobject obj = cons->newInstance (values);
 574
 575       env->ex = reinterpret_cast<jthrowable> (obj);
 576     }
 577   catch (jthrowable t)
 578     {
 579       env->ex = t;
 580       r = JNI_ERR;
 581     }
 582
 583   return r;
 584 }
 585
 586 static jthrowable JNICALL
 587 _Jv_JNI_ExceptionOccurred (JNIEnv *env)
 588 {
 589   return (jthrowable) wrap_value (env, env->ex);
 590 }
 591
 592 static void JNICALL
 593 _Jv_JNI_ExceptionDescribe (JNIEnv *env)
 594 {
 595   if (env->ex != NULL)
 596     env->ex->printStackTrace();
 597 }
 598
 599 static void JNICALL
 600 _Jv_JNI_ExceptionClear (JNIEnv *env)
 601 {
 602   env->ex = NULL;
 603 }
 604
 605 static jboolean JNICALL
 606 _Jv_JNI_ExceptionCheck (JNIEnv *env)
 607 {
 608   return env->ex != NULL;
 609 }
 610
 611 static void JNICALL
 612 _Jv_JNI_FatalError (JNIEnv *, const char *message)
 613 {
 614   JvFail (message);
 615 }
 616
 617 \f
 618
 619 static jboolean JNICALL
 620 _Jv_JNI_IsSameObject (JNIEnv *, jobject obj1, jobject obj2)
 621 {
 622   return unwrap (obj1) == unwrap (obj2);
 623 }
 624
 625 static jobject JNICALL
 626 _Jv_JNI_AllocObject (JNIEnv *env, jclass clazz)
 627 {
 628   jobject obj = NULL;
 629   using namespace java::lang::reflect;
 630
 631   try
 632     {
 633       clazz = unwrap (clazz);
 634       JvAssert (clazz && ! clazz->isArray ());
 635       if (clazz->isInterface() || Modifier::isAbstract(clazz->getModifiers()))
 636         env->ex = new java::lang::InstantiationException ();
 637       else
 638         obj = _Jv_AllocObject (clazz);
 639     }
 640   catch (jthrowable t)
 641     {
 642       env->ex = t;
 643     }
 644
 645   return wrap_value (env, obj);
 646 }
 647
 648 static jclass JNICALL
 649 _Jv_JNI_GetObjectClass (JNIEnv *env, jobject obj)
 650 {
 651   obj = unwrap (obj);
 652   JvAssert (obj);
 653   return (jclass) wrap_value (env, obj->getClass());
 654 }
 655
 656 static jboolean JNICALL
 657 _Jv_JNI_IsInstanceOf (JNIEnv *, jobject obj, jclass clazz)
 658 {
 659   return unwrap (clazz)->isInstance(unwrap (obj));
 660 }
 661
 662 \f
 663
 664 //
 665 // This section concerns method invocation.
 666 //
 667
 668 template<jboolean is_static>
 669 static jmethodID JNICALL
 670 _Jv_JNI_GetAnyMethodID (JNIEnv *env, jclass clazz,
 671                         const char *name, const char *sig)
 672 {
 673   try
 674     {
 675       clazz = unwrap (clazz);
 676       _Jv_InitClass (clazz);
 677
 678       _Jv_Utf8Const *name_u = _Jv_makeUtf8Const ((char *) name, -1);
 679
 680       // FIXME: assume that SIG isn't too long.
 681       int len = strlen (sig);
 682       char s[len + 1];
 683       for (int i = 0; i <= len; ++i)
 684         s[i] = (sig[i] == '/') ? '.' : sig[i];
 685       _Jv_Utf8Const *sig_u = _Jv_makeUtf8Const ((char *) s, -1);
 686
 687       JvAssert (! clazz->isPrimitive());
 688
 689       using namespace java::lang::reflect;
 690
 691       while (clazz != NULL)
 692         {
 693           jint count = JvNumMethods (clazz);
 694           jmethodID meth = JvGetFirstMethod (clazz);
 695
 696           for (jint i = 0; i < count; ++i)
 697             {
 698               if (((is_static && Modifier::isStatic (meth->accflags))
 699                    || (! is_static && ! Modifier::isStatic (meth->accflags)))
 700                   && _Jv_equalUtf8Consts (meth->name, name_u)
 701                   && _Jv_equalUtf8Consts (meth->signature, sig_u))
 702                 return meth;
 703
 704               meth = meth->getNextMethod();
 705             }
 706
 707           clazz = clazz->getSuperclass ();
 708         }
 709
 710       java::lang::StringBuffer *name_sig =
 711         new java::lang::StringBuffer (JvNewStringUTF (name));
 712       name_sig->append ((jchar) ' ')->append (JvNewStringUTF (s));
 713       env->ex = new java::lang::NoSuchMethodError (name_sig->toString ());
 714     }
 715   catch (jthrowable t)
 716     {
 717       env->ex = t;
 718     }
 719
 720   return NULL;
 721 }
 722
 723 // This is a helper function which turns a va_list into an array of
 724 // `jvalue's.  It needs signature information in order to do its work.
 725 // The array of values must already be allocated.
 726 static void
 727 array_from_valist (jvalue *values, JArray<jclass> *arg_types, va_list vargs)
 728 {
 729   jclass *arg_elts = elements (arg_types);
 730   for (int i = 0; i < arg_types->length; ++i)
 731     {
 732       // Here we assume that sizeof(int) >= sizeof(jint), because we
 733       // use `int' when decoding the varargs.  Likewise for
 734       // float, and double.  Also we assume that sizeof(jlong) >=
 735       // sizeof(int), i.e. that jlong values are not further
 736       // promoted.
 737       JvAssert (sizeof (int) >= sizeof (jint));
 738       JvAssert (sizeof (jlong) >= sizeof (int));
 739       JvAssert (sizeof (double) >= sizeof (jfloat));
 740       JvAssert (sizeof (double) >= sizeof (jdouble));
 741       if (arg_elts[i] == JvPrimClass (byte))
 742         values[i].b = (jbyte) va_arg (vargs, int);
 743       else if (arg_elts[i] == JvPrimClass (short))
 744         values[i].s = (jshort) va_arg (vargs, int);
 745       else if (arg_elts[i] == JvPrimClass (int))
 746         values[i].i = (jint) va_arg (vargs, int);
 747       else if (arg_elts[i] == JvPrimClass (long))
 748         values[i].j = (jlong) va_arg (vargs, jlong);
 749       else if (arg_elts[i] == JvPrimClass (float))
 750         values[i].f = (jfloat) va_arg (vargs, double);
 751       else if (arg_elts[i] == JvPrimClass (double))
 752         values[i].d = (jdouble) va_arg (vargs, double);
 753       else if (arg_elts[i] == JvPrimClass (boolean))
 754         values[i].z = (jboolean) va_arg (vargs, int);
 755       else if (arg_elts[i] == JvPrimClass (char))
 756         values[i].c = (jchar) va_arg (vargs, int);
 757       else
 758         {
 759           // An object.
 760           values[i].l = unwrap (va_arg (vargs, jobject));
 761         }
 762     }
 763 }
 764
 765 // This can call any sort of method: virtual, "nonvirtual", static, or
 766 // constructor.
 767 template<typename T, invocation_type style>
 768 static T JNICALL
 769 _Jv_JNI_CallAnyMethodV (JNIEnv *env, jobject obj, jclass klass,
 770                         jmethodID id, va_list vargs)
 771 {
 772   obj = unwrap (obj);
 773   klass = unwrap (klass);
 774
 775   jclass decl_class = klass ? klass : obj->getClass ();
 776   JvAssert (decl_class != NULL);
 777
 778   jclass return_type;
 779   JArray<jclass> *arg_types;
 780
 781   try
 782     {
 783       _Jv_GetTypesFromSignature (id, decl_class,
 784                                  &arg_types, &return_type);
 785
 786       jvalue args[arg_types->length];
 787       array_from_valist (args, arg_types, vargs);
 788
 789       // For constructors we need to pass the Class we are instantiating.
 790       if (style == constructor)
 791         return_type = klass;
 792
 793       jvalue result;
 794       _Jv_CallAnyMethodA (obj, return_type, id,
 795                           style == constructor,
 796                           style == normal,
 797                           arg_types, args, &result);
 798
 799       return wrap_value (env, extract_from_jvalue<T>(result));
 800     }
 801   catch (jthrowable t)
 802     {
 803       env->ex = t;
 804     }
 805
 806   return wrap_value (env, (T) 0);
 807 }
 808
 809 template<typename T, invocation_type style>
 810 static T JNICALL
 811 _Jv_JNI_CallAnyMethod (JNIEnv *env, jobject obj, jclass klass,
 812                        jmethodID method, ...)
 813 {
 814   va_list args;
 815   T result;
 816
 817   va_start (args, method);
 818   result = _Jv_JNI_CallAnyMethodV<T, style> (env, obj, klass, method, args);
 819   va_end (args);
 820
 821   return result;
 822 }
 823
 824 template<typename T, invocation_type style>
 825 static T JNICALL
 826 _Jv_JNI_CallAnyMethodA (JNIEnv *env, jobject obj, jclass klass,
 827                         jmethodID id, jvalue *args)
 828 {
 829   obj = unwrap (obj);
 830   klass = unwrap (klass);
 831
 832   jclass decl_class = klass ? klass : obj->getClass ();
 833   JvAssert (decl_class != NULL);
 834
 835   jclass return_type;
 836   JArray<jclass> *arg_types;
 837   try
 838     {
 839       _Jv_GetTypesFromSignature (id, decl_class,
 840                                  &arg_types, &return_type);
 841
 842       // For constructors we need to pass the Class we are instantiating.
 843       if (style == constructor)
 844         return_type = klass;
 845
 846       // Unwrap arguments as required.  Eww.
 847       jclass *type_elts = elements (arg_types);
 848       jvalue arg_copy[arg_types->length];
 849       for (int i = 0; i < arg_types->length; ++i)
 850         {
 851           if (type_elts[i]->isPrimitive ())
 852             arg_copy[i] = args[i];
 853           else
 854             arg_copy[i].l = unwrap (args[i].l);
 855         }
 856
 857       jvalue result;
 858       _Jv_CallAnyMethodA (obj, return_type, id,
 859                           style == constructor,
 860                           style == normal,
 861                           arg_types, arg_copy, &result);
 862
 863       return wrap_value (env, extract_from_jvalue<T>(result));
 864     }
 865   catch (jthrowable t)
 866     {
 867       env->ex = t;
 868     }
 869
 870   return wrap_value (env, (T) 0);
 871 }
 872
 873 template<invocation_type style>
 874 static void JNICALL
 875 _Jv_JNI_CallAnyVoidMethodV (JNIEnv *env, jobject obj, jclass klass,
 876                             jmethodID id, va_list vargs)
 877 {
 878   obj = unwrap (obj);
 879   klass = unwrap (klass);
 880
 881   jclass decl_class = klass ? klass : obj->getClass ();
 882   JvAssert (decl_class != NULL);
 883
 884   jclass return_type;
 885   JArray<jclass> *arg_types;
 886   try
 887     {
 888       _Jv_GetTypesFromSignature (id, decl_class,
 889                                  &arg_types, &return_type);
 890
 891       jvalue args[arg_types->length];
 892       array_from_valist (args, arg_types, vargs);
 893
 894       // For constructors we need to pass the Class we are instantiating.
 895       if (style == constructor)
 896         return_type = klass;
 897
 898       _Jv_CallAnyMethodA (obj, return_type, id,
 899                           style == constructor,
 900                           style == normal,
 901                           arg_types, args, NULL);
 902     }
 903   catch (jthrowable t)
 904     {
 905       env->ex = t;
 906     }
 907 }
 908
 909 template<invocation_type style>
 910 static void JNICALL
 911 _Jv_JNI_CallAnyVoidMethod (JNIEnv *env, jobject obj, jclass klass,
 912                            jmethodID method, ...)
 913 {
 914   va_list args;
 915
 916   va_start (args, method);
 917   _Jv_JNI_CallAnyVoidMethodV<style> (env, obj, klass, method, args);
 918   va_end (args);
 919 }
 920
 921 template<invocation_type style>
 922 static void JNICALL
 923 _Jv_JNI_CallAnyVoidMethodA (JNIEnv *env, jobject obj, jclass klass,
 924                             jmethodID id, jvalue *args)
 925 {
 926   jclass decl_class = klass ? klass : obj->getClass ();
 927   JvAssert (decl_class != NULL);
 928
 929   jclass return_type;
 930   JArray<jclass> *arg_types;
 931   try
 932     {
 933       _Jv_GetTypesFromSignature (id, decl_class,
 934                                  &arg_types, &return_type);
 935
 936       // Unwrap arguments as required.  Eww.
 937       jclass *type_elts = elements (arg_types);
 938       jvalue arg_copy[arg_types->length];
 939       for (int i = 0; i < arg_types->length; ++i)
 940         {
 941           if (type_elts[i]->isPrimitive ())
 942             arg_copy[i] = args[i];
 943           else
 944             arg_copy[i].l = unwrap (args[i].l);
 945         }
 946
 947       _Jv_CallAnyMethodA (obj, return_type, id,
 948                           style == constructor,
 949                           style == normal,
 950                           arg_types, args, NULL);
 951     }
 952   catch (jthrowable t)
 953     {
 954       env->ex = t;
 955     }
 956 }
 957
 958 // Functions with this signature are used to implement functions in
 959 // the CallMethod family.
 960 template<typename T>
 961 static T JNICALL
 962 _Jv_JNI_CallMethodV (JNIEnv *env, jobject obj,
 963                      jmethodID id, va_list args)
 964 {
 965   return _Jv_JNI_CallAnyMethodV<T, normal> (env, obj, NULL, id, args);
 966 }
 967
 968 // Functions with this signature are used to implement functions in
 969 // the CallMethod family.
 970 template<typename T>
 971 static T JNICALL
 972 _Jv_JNI_CallMethod (JNIEnv *env, jobject obj, jmethodID id, ...)
 973 {
 974   va_list args;
 975   T result;
 976
 977   va_start (args, id);
 978   result = _Jv_JNI_CallAnyMethodV<T, normal> (env, obj, NULL, id, args);
 979   va_end (args);
 980
 981   return result;
 982 }
 983
 984 // Functions with this signature are used to implement functions in
 985 // the CallMethod family.
 986 template<typename T>
 987 static T JNICALL
 988 _Jv_JNI_CallMethodA (JNIEnv *env, jobject obj,
 989                      jmethodID id, jvalue *args)
 990 {
 991   return _Jv_JNI_CallAnyMethodA<T, normal> (env, obj, NULL, id, args);
 992 }
 993
 994 static void JNICALL
 995 _Jv_JNI_CallVoidMethodV (JNIEnv *env, jobject obj,
 996                          jmethodID id, va_list args)
 997 {
 998   _Jv_JNI_CallAnyVoidMethodV<normal> (env, obj, NULL, id, args);
 999 }
1000
1001 static void JNICALL
1002 _Jv_JNI_CallVoidMethod (JNIEnv *env, jobject obj, jmethodID id, ...)
1003 {
1004   va_list args;
1005
1006   va_start (args, id);
1007   _Jv_JNI_CallAnyVoidMethodV<normal> (env, obj, NULL, id, args);
1008   va_end (args);
1009 }
1010
1011 static void JNICALL
1012 _Jv_JNI_CallVoidMethodA (JNIEnv *env, jobject obj,
1013                          jmethodID id, jvalue *args)
1014 {
1015   _Jv_JNI_CallAnyVoidMethodA<normal> (env, obj, NULL, id, args);
1016 }
1017
1018 // Functions with this signature are used to implement functions in
1019 // the CallStaticMethod family.
1020 template<typename T>
1021 static T JNICALL
1022 _Jv_JNI_CallStaticMethodV (JNIEnv *env, jclass klass,
1023                            jmethodID id, va_list args)
1024 {
1025   JvAssert (((id->accflags) & java::lang::reflect::Modifier::STATIC));
1026   JvAssert (java::lang::Class::class$.isInstance (unwrap (klass)));
1027
1028   return _Jv_JNI_CallAnyMethodV<T, static_type> (env, NULL, klass, id, args);
1029 }
1030
1031 // Functions with this signature are used to implement functions in
1032 // the CallStaticMethod family.
1033 template<typename T>
1034 static T JNICALL
1035 _Jv_JNI_CallStaticMethod (JNIEnv *env, jclass klass,
1036                           jmethodID id, ...)
1037 {
1038   va_list args;
1039   T result;
1040
1041   JvAssert (((id->accflags) & java::lang::reflect::Modifier::STATIC));
1042   JvAssert (java::lang::Class::class$.isInstance (unwrap (klass)));
1043
1044   va_start (args, id);
1045   result = _Jv_JNI_CallAnyMethodV<T, static_type> (env, NULL, klass,
1046                                                    id, args);
1047   va_end (args);
1048
1049   return result;
1050 }
1051
1052 // Functions with this signature are used to implement functions in
1053 // the CallStaticMethod family.
1054 template<typename T>
1055 static T JNICALL
1056 _Jv_JNI_CallStaticMethodA (JNIEnv *env, jclass klass, jmethodID id,
1057                            jvalue *args)
1058 {
1059   JvAssert (((id->accflags) & java::lang::reflect::Modifier::STATIC));
1060   JvAssert (java::lang::Class::class$.isInstance (unwrap (klass)));
1061
1062   return _Jv_JNI_CallAnyMethodA<T, static_type> (env, NULL, klass, id, args);
1063 }
1064
1065 static void JNICALL
1066 _Jv_JNI_CallStaticVoidMethodV (JNIEnv *env, jclass klass,
1067                                jmethodID id, va_list args)
1068 {
1069   _Jv_JNI_CallAnyVoidMethodV<static_type> (env, NULL, klass, id, args);
1070 }
1071
1072 static void JNICALL
1073 _Jv_JNI_CallStaticVoidMethod (JNIEnv *env, jclass klass,
1074                               jmethodID id, ...)
1075 {
1076   va_list args;
1077
1078   va_start (args, id);
1079   _Jv_JNI_CallAnyVoidMethodV<static_type> (env, NULL, klass, id, args);
1080   va_end (args);
1081 }
1082
1083 static void JNICALL
1084 _Jv_JNI_CallStaticVoidMethodA (JNIEnv *env, jclass klass,
1085                                jmethodID id, jvalue *args)
1086 {
1087   _Jv_JNI_CallAnyVoidMethodA<static_type> (env, NULL, klass, id, args);
1088 }
1089
1090 static jobject JNICALL
1091 _Jv_JNI_NewObjectV (JNIEnv *env, jclass klass,
1092                     jmethodID id, va_list args)
1093 {
1094   JvAssert (klass && ! klass->isArray ());
1095   JvAssert (! strcmp (id->name->data, "<init>")
1096             && id->signature->length > 2
1097             && id->signature->data[0] == '('
1098             && ! strcmp (&id->signature->data[id->signature->length - 2],
1099                          ")V"));
1100
1101   return _Jv_JNI_CallAnyMethodV<jobject, constructor> (env, NULL, klass,
1102                                                        id, args);
1103 }
1104
1105 static jobject JNICALL
1106 _Jv_JNI_NewObject (JNIEnv *env, jclass klass, jmethodID id, ...)
1107 {
1108   JvAssert (klass && ! klass->isArray ());
1109   JvAssert (! strcmp (id->name->data, "<init>")
1110             && id->signature->length > 2
1111             && id->signature->data[0] == '('
1112             && ! strcmp (&id->signature->data[id->signature->length - 2],
1113                          ")V"));
1114
1115   va_list args;
1116   jobject result;
1117
1118   va_start (args, id);
1119   result = _Jv_JNI_CallAnyMethodV<jobject, constructor> (env, NULL, klass,
1120                                                          id, args);
1121   va_end (args);
1122
1123   return result;
1124 }
1125
1126 static jobject JNICALL
1127 _Jv_JNI_NewObjectA (JNIEnv *env, jclass klass, jmethodID id,
1128                     jvalue *args)
1129 {
1130   JvAssert (klass && ! klass->isArray ());
1131   JvAssert (! strcmp (id->name->data, "<init>")
1132             && id->signature->length > 2
1133             && id->signature->data[0] == '('
1134             && ! strcmp (&id->signature->data[id->signature->length - 2],
1135                          ")V"));
1136
1137   return _Jv_JNI_CallAnyMethodA<jobject, constructor> (env, NULL, klass,
1138                                                        id, args);
1139 }
1140
1141 \f
1142
1143 template<typename T>
1144 static T JNICALL
1145 _Jv_JNI_GetField (JNIEnv *env, jobject obj, jfieldID field)
1146 {
1147   obj = unwrap (obj);
1148   JvAssert (obj);
1149   T *ptr = (T *) ((char *) obj + field->getOffset ());
1150   return wrap_value (env, *ptr);
1151 }
1152
1153 template<typename T>
1154 static void JNICALL
1155 _Jv_JNI_SetField (JNIEnv *, jobject obj, jfieldID field, T value)
1156 {
1157   obj = unwrap (obj);
1158   value = unwrap (value);
1159
1160   JvAssert (obj);
1161   T *ptr = (T *) ((char *) obj + field->getOffset ());
1162   *ptr = value;
1163 }
1164
1165 template<jboolean is_static>
1166 static jfieldID JNICALL
1167 _Jv_JNI_GetAnyFieldID (JNIEnv *env, jclass clazz,
1168                        const char *name, const char *sig)
1169 {
1170   try
1171     {
1172       clazz = unwrap (clazz);
1173
1174       _Jv_InitClass (clazz);
1175
1176       _Jv_Utf8Const *a_name = _Jv_makeUtf8Const ((char *) name, -1);
1177
1178       // FIXME: assume that SIG isn't too long.
1179       int len = strlen (sig);
1180       char s[len + 1];
1181       for (int i = 0; i <= len; ++i)
1182         s[i] = (sig[i] == '/') ? '.' : sig[i];
1183       jclass field_class = _Jv_FindClassFromSignature ((char *) s, NULL);
1184
1185       // FIXME: what if field_class == NULL?
1186
1187       java::lang::ClassLoader *loader = clazz->getClassLoaderInternal ();
1188       while (clazz != NULL)
1189         {
1190           // We acquire the class lock so that fields aren't resolved
1191           // while we are running.
1192           JvSynchronize sync (clazz);
1193
1194           jint count = (is_static
1195                         ? JvNumStaticFields (clazz)
1196                         : JvNumInstanceFields (clazz));
1197           jfieldID field = (is_static
1198                             ? JvGetFirstStaticField (clazz)
1199                             : JvGetFirstInstanceField (clazz));
1200           for (jint i = 0; i < count; ++i)
1201             {
1202               _Jv_Utf8Const *f_name = field->getNameUtf8Const(clazz);
1203
1204               // The field might be resolved or it might not be.  It
1205               // is much simpler to always resolve it.
1206               _Jv_ResolveField (field, loader);
1207               if (_Jv_equalUtf8Consts (f_name, a_name)
1208                   && field->getClass() == field_class)
1209                 return field;
1210
1211               field = field->getNextField ();
1212             }
1213
1214           clazz = clazz->getSuperclass ();
1215         }
1216
1217       env->ex = new java::lang::NoSuchFieldError ();
1218     }
1219   catch (jthrowable t)
1220     {
1221       env->ex = t;
1222     }
1223   return NULL;
1224 }
1225
1226 template<typename T>
1227 static T JNICALL
1228 _Jv_JNI_GetStaticField (JNIEnv *env, jclass, jfieldID field)
1229 {
1230   T *ptr = (T *) field->u.addr;
1231   return wrap_value (env, *ptr);
1232 }
1233
1234 template<typename T>
1235 static void JNICALL
1236 _Jv_JNI_SetStaticField (JNIEnv *, jclass, jfieldID field, T value)
1237 {
1238   value = unwrap (value);
1239   T *ptr = (T *) field->u.addr;
1240   *ptr = value;
1241 }
1242
1243 static jstring JNICALL
1244 _Jv_JNI_NewString (JNIEnv *env, const jchar *unichars, jsize len)
1245 {
1246   try
1247     {
1248       jstring r = _Jv_NewString (unichars, len);
1249       return (jstring) wrap_value (env, r);
1250     }
1251   catch (jthrowable t)
1252     {
1253       env->ex = t;
1254       return NULL;
1255     }
1256 }
1257
1258 static jsize JNICALL
1259 _Jv_JNI_GetStringLength (JNIEnv *, jstring string)
1260 {
1261   return unwrap (string)->length();
1262 }
1263
1264 static const jchar * JNICALL
1265 _Jv_JNI_GetStringChars (JNIEnv *, jstring string, jboolean *isCopy)
1266 {
1267   string = unwrap (string);
1268   jchar *result = _Jv_GetStringChars (string);
1269   mark_for_gc (string, global_ref_table);
1270   if (isCopy)
1271     *isCopy = false;
1272   return (const jchar *) result;
1273 }
1274
1275 static void JNICALL
1276 _Jv_JNI_ReleaseStringChars (JNIEnv *, jstring string, const jchar *)
1277 {
1278   unmark_for_gc (unwrap (string), global_ref_table);
1279 }
1280
1281 static jstring JNICALL
1282 _Jv_JNI_NewStringUTF (JNIEnv *env, const char *bytes)
1283 {
1284   try
1285     {
1286       jstring result = JvNewStringUTF (bytes);
1287       return (jstring) wrap_value (env, result);
1288     }
1289   catch (jthrowable t)
1290     {
1291       env->ex = t;
1292       return NULL;
1293     }
1294 }
1295
1296 static jsize JNICALL
1297 _Jv_JNI_GetStringUTFLength (JNIEnv *, jstring string)
1298 {
1299   return JvGetStringUTFLength (unwrap (string));
1300 }
1301
1302 static const char * JNICALL
1303 _Jv_JNI_GetStringUTFChars (JNIEnv *env, jstring string,
1304                            jboolean *isCopy)
1305 {
1306   try
1307     {
1308       string = unwrap (string);
1309       if (string == NULL)
1310         return NULL;
1311       jsize len = JvGetStringUTFLength (string);
1312       char *r = (char *) _Jv_Malloc (len + 1);
1313       JvGetStringUTFRegion (string, 0, string->length(), r);
1314       r[len] = '\0';
1315
1316       if (isCopy)
1317         *isCopy = true;
1318
1319       return (const char *) r;
1320     }
1321   catch (jthrowable t)
1322     {
1323       env->ex = t;
1324       return NULL;
1325     }
1326 }
1327
1328 static void JNICALL
1329 _Jv_JNI_ReleaseStringUTFChars (JNIEnv *, jstring, const char *utf)
1330 {
1331   _Jv_Free ((void *) utf);
1332 }
1333
1334 static void JNICALL
1335 _Jv_JNI_GetStringRegion (JNIEnv *env, jstring string, jsize start,
1336                          jsize len, jchar *buf)
1337 {
1338   string = unwrap (string);
1339   jchar *result = _Jv_GetStringChars (string);
1340   if (start < 0 || start > string->length ()
1341       || len < 0 || start + len > string->length ())
1342     {
1343       try
1344         {
1345           env->ex = new java::lang::StringIndexOutOfBoundsException ();
1346         }
1347       catch (jthrowable t)
1348         {
1349           env->ex = t;
1350         }
1351     }
1352   else
1353     memcpy (buf, &result[start], len * sizeof (jchar));
1354 }
1355
1356 static void JNICALL
1357 _Jv_JNI_GetStringUTFRegion (JNIEnv *env, jstring str, jsize start,
1358                             jsize len, char *buf)
1359 {
1360   str = unwrap (str);
1361
1362   if (start < 0 || start > str->length ()
1363       || len < 0 || start + len > str->length ())
1364     {
1365       try
1366         {
1367           env->ex = new java::lang::StringIndexOutOfBoundsException ();
1368         }
1369       catch (jthrowable t)
1370         {
1371           env->ex = t;
1372         }
1373     }
1374   else
1375     _Jv_GetStringUTFRegion (str, start, len, buf);
1376 }
1377
1378 static const jchar * JNICALL
1379 _Jv_JNI_GetStringCritical (JNIEnv *, jstring str, jboolean *isCopy)
1380 {
1381   jchar *result = _Jv_GetStringChars (unwrap (str));
1382   if (isCopy)
1383     *isCopy = false;
1384   return result;
1385 }
1386
1387 static void JNICALL
1388 _Jv_JNI_ReleaseStringCritical (JNIEnv *, jstring, const jchar *)
1389 {
1390   // Nothing.
1391 }
1392
1393 static jsize JNICALL
1394 _Jv_JNI_GetArrayLength (JNIEnv *, jarray array)
1395 {
1396   return unwrap (array)->length;
1397 }
1398
1399 static jarray JNICALL
1400 _Jv_JNI_NewObjectArray (JNIEnv *env, jsize length,
1401                         jclass elementClass, jobject init)
1402 {
1403   try
1404     {
1405       elementClass = unwrap (elementClass);
1406       init = unwrap (init);
1407
1408       _Jv_CheckCast (elementClass, init);
1409       jarray result = JvNewObjectArray (length, elementClass, init);
1410       return (jarray) wrap_value (env, result);
1411     }
1412   catch (jthrowable t)
1413     {
1414       env->ex = t;
1415       return NULL;
1416     }
1417 }
1418
1419 static jobject JNICALL
1420 _Jv_JNI_GetObjectArrayElement (JNIEnv *env, jobjectArray array,
1421                                jsize index)
1422 {
1423   if ((unsigned) index >= (unsigned) array->length)
1424     _Jv_ThrowBadArrayIndex (index);
1425   jobject *elts = elements (unwrap (array));
1426   return wrap_value (env, elts[index]);
1427 }
1428
1429 static void JNICALL
1430 _Jv_JNI_SetObjectArrayElement (JNIEnv *env, jobjectArray array,
1431                                jsize index, jobject value)
1432 {
1433   try
1434     {
1435       array = unwrap (array);
1436       value = unwrap (value);
1437
1438       _Jv_CheckArrayStore (array, value);
1439       if ((unsigned) index >= (unsigned) array->length)
1440         _Jv_ThrowBadArrayIndex (index);
1441       jobject *elts = elements (array);
1442       elts[index] = value;
1443     }
1444   catch (jthrowable t)
1445     {
1446       env->ex = t;
1447     }
1448 }
1449
1450 template<typename T, jclass K>
1451 static JArray<T> * JNICALL
1452 _Jv_JNI_NewPrimitiveArray (JNIEnv *env, jsize length)
1453 {
1454   try
1455     {
1456       return (JArray<T> *) wrap_value (env, _Jv_NewPrimArray (K, length));
1457     }
1458   catch (jthrowable t)
1459     {
1460       env->ex = t;
1461       return NULL;
1462     }
1463 }
1464
1465 template<typename T, jclass K>
1466 static T * JNICALL
1467 _Jv_JNI_GetPrimitiveArrayElements (JNIEnv *env, JArray<T> *array,
1468                                    jboolean *isCopy)
1469 {
1470   array = unwrap (array);
1471   if (! _Jv_JNI_check_types (env, array, K))
1472     return NULL;
1473   T *elts = elements (array);
1474   if (isCopy)
1475     {
1476       // We elect never to copy.
1477       *isCopy = false;
1478     }
1479   mark_for_gc (array, global_ref_table);
1480   return elts;
1481 }
1482
1483 template<typename T, jclass K>
1484 static void JNICALL
1485 _Jv_JNI_ReleasePrimitiveArrayElements (JNIEnv *env, JArray<T> *array,
1486                                        T *, jint /* mode */)
1487 {
1488   array = unwrap (array);
1489   _Jv_JNI_check_types (env, array, K);
1490   // Note that we ignore MODE.  We can do this because we never copy
1491   // the array elements.  My reading of the JNI documentation is that
1492   // this is an option for the implementor.
1493   unmark_for_gc (array, global_ref_table);
1494 }
1495
1496 template<typename T, jclass K>
1497 static void JNICALL
1498 _Jv_JNI_GetPrimitiveArrayRegion (JNIEnv *env, JArray<T> *array,
1499                                  jsize start, jsize len,
1500                                  T *buf)
1501 {
1502   array = unwrap (array);
1503   if (! _Jv_JNI_check_types (env, array, K))
1504     return;
1505
1506   // The cast to unsigned lets us save a comparison.
1507   if (start < 0 || len < 0
1508       || (unsigned long) (start + len) > (unsigned long) array->length)
1509     {
1510       try
1511         {
1512           // FIXME: index.
1513           env->ex = new java::lang::ArrayIndexOutOfBoundsException ();
1514         }
1515       catch (jthrowable t)
1516         {
1517           // Could have thown out of memory error.
1518           env->ex = t;
1519         }
1520     }
1521   else
1522     {
1523       T *elts = elements (array) + start;
1524       memcpy (buf, elts, len * sizeof (T));
1525     }
1526 }
1527
1528 template<typename T, jclass K>
1529 static void JNICALL
1530 _Jv_JNI_SetPrimitiveArrayRegion (JNIEnv *env, JArray<T> *array,
1531                                  jsize start, jsize len, T *buf)
1532 {
1533   array = unwrap (array);
1534   if (! _Jv_JNI_check_types (env, array, K))
1535     return;
1536
1537   // The cast to unsigned lets us save a comparison.
1538   if (start < 0 || len < 0
1539       || (unsigned long) (start + len) > (unsigned long) array->length)
1540     {
1541       try
1542         {
1543           // FIXME: index.
1544           env->ex = new java::lang::ArrayIndexOutOfBoundsException ();
1545         }
1546       catch (jthrowable t)
1547         {
1548           env->ex = t;
1549         }
1550     }
1551   else
1552     {
1553       T *elts = elements (array) + start;
1554       memcpy (elts, buf, len * sizeof (T));
1555     }
1556 }
1557
1558 static void * JNICALL
1559 _Jv_JNI_GetPrimitiveArrayCritical (JNIEnv *, jarray array,
1560                                    jboolean *isCopy)
1561 {
1562   array = unwrap (array);
1563   // FIXME: does this work?
1564   jclass klass = array->getClass()->getComponentType();
1565   JvAssert (klass->isPrimitive ());
1566   char *r = _Jv_GetArrayElementFromElementType (array, klass);
1567   if (isCopy)
1568     *isCopy = false;
1569   return r;
1570 }
1571
1572 static void JNICALL
1573 _Jv_JNI_ReleasePrimitiveArrayCritical (JNIEnv *, jarray, void *, jint)
1574 {
1575   // Nothing.
1576 }
1577
1578 static jint JNICALL
1579 _Jv_JNI_MonitorEnter (JNIEnv *env, jobject obj)
1580 {
1581   try
1582     {
1583       _Jv_MonitorEnter (unwrap (obj));
1584       return 0;
1585     }
1586   catch (jthrowable t)
1587     {
1588       env->ex = t;
1589     }
1590   return JNI_ERR;
1591 }
1592
1593 static jint JNICALL
1594 _Jv_JNI_MonitorExit (JNIEnv *env, jobject obj)
1595 {
1596   try
1597     {
1598       _Jv_MonitorExit (unwrap (obj));
1599       return 0;
1600     }
1601   catch (jthrowable t)
1602     {
1603       env->ex = t;
1604     }
1605   return JNI_ERR;
1606 }
1607
1608 // JDK 1.2
1609 jobject JNICALL
1610 _Jv_JNI_ToReflectedField (JNIEnv *env, jclass cls, jfieldID fieldID,
1611                           jboolean)
1612 {
1613   try
1614     {
1615       cls = unwrap (cls);
1616       java::lang::reflect::Field *field = new java::lang::reflect::Field();
1617       field->declaringClass = cls;
1618       field->offset = (char*) fieldID - (char *) cls->fields;
1619       field->name = _Jv_NewStringUtf8Const (fieldID->getNameUtf8Const (cls));
1620       return wrap_value (env, field);
1621     }
1622   catch (jthrowable t)
1623     {
1624       env->ex = t;
1625     }
1626   return NULL;
1627 }
1628
1629 // JDK 1.2
1630 static jfieldID JNICALL
1631 _Jv_JNI_FromReflectedField (JNIEnv *, jobject f)
1632 {
1633   using namespace java::lang::reflect;
1634
1635   f = unwrap (f);
1636   Field *field = reinterpret_cast<Field *> (f);
1637   return _Jv_FromReflectedField (field);
1638 }
1639
1640 jobject JNICALL
1641 _Jv_JNI_ToReflectedMethod (JNIEnv *env, jclass klass, jmethodID id,
1642                            jboolean)
1643 {
1644   using namespace java::lang::reflect;
1645
1646   jobject result = NULL;
1647   klass = unwrap (klass);
1648
1649   try
1650     {
1651       if (_Jv_equalUtf8Consts (id->name, init_name))
1652         {
1653           // A constructor.
1654           Constructor *cons = new Constructor ();
1655           cons->offset = (char *) id - (char *) &klass->methods;
1656           cons->declaringClass = klass;
1657           result = cons;
1658         }
1659       else
1660         {
1661           Method *meth = new Method ();
1662           meth->offset = (char *) id - (char *) &klass->methods;
1663           meth->declaringClass = klass;
1664           result = meth;
1665         }
1666     }
1667   catch (jthrowable t)
1668     {
1669       env->ex = t;
1670     }
1671
1672   return wrap_value (env, result);
1673 }
1674
1675 static jmethodID JNICALL
1676 _Jv_JNI_FromReflectedMethod (JNIEnv *, jobject method)
1677 {
1678   using namespace java::lang::reflect;
1679   method = unwrap (method);
1680   if (Method::class$.isInstance (method))
1681     return _Jv_FromReflectedMethod (reinterpret_cast<Method *> (method));
1682   return
1683     _Jv_FromReflectedConstructor (reinterpret_cast<Constructor *> (method));
1684 }
1685
1686 // JDK 1.2.
1687 jweak JNICALL
1688 _Jv_JNI_NewWeakGlobalRef (JNIEnv *env, jobject obj)
1689 {
1690   using namespace gnu::gcj::runtime;
1691   JNIWeakRef *ref = NULL;
1692
1693   try
1694     {
1695       // This seems weird but I think it is correct.
1696       obj = unwrap (obj);
1697       ref = new JNIWeakRef (obj);
1698       mark_for_gc (ref, global_ref_table);
1699     }
1700   catch (jthrowable t)
1701     {
1702       env->ex = t;
1703     }
1704
1705   return reinterpret_cast<jweak> (ref);
1706 }
1707
1708 void JNICALL
1709 _Jv_JNI_DeleteWeakGlobalRef (JNIEnv *, jweak obj)
1710 {
1711   using namespace gnu::gcj::runtime;
1712   JNIWeakRef *ref = reinterpret_cast<JNIWeakRef *> (obj);
1713   unmark_for_gc (ref, global_ref_table);
1714   ref->clear ();
1715 }
1716
1717 \f
1718
1719 // Direct byte buffers.
1720
1721 static jobject JNICALL
1722 _Jv_JNI_NewDirectByteBuffer (JNIEnv *, void *address, jlong length)
1723 {
1724   using namespace gnu::gcj;
1725   using namespace java::nio;
1726   return new DirectByteBufferImpl (reinterpret_cast<RawData *> (address),
1727                                    length);
1728 }
1729
1730 static void * JNICALL
1731 _Jv_JNI_GetDirectBufferAddress (JNIEnv *, jobject buffer)
1732 {
1733   using namespace java::nio;
1734   DirectByteBufferImpl* bb = static_cast<DirectByteBufferImpl *> (buffer);
1735   return reinterpret_cast<void *> (bb->address);
1736 }
1737
1738 static jlong JNICALL
1739 _Jv_JNI_GetDirectBufferCapacity (JNIEnv *, jobject buffer)
1740 {
1741   using namespace java::nio;
1742   DirectByteBufferImpl* bb = static_cast<DirectByteBufferImpl *> (buffer);
1743   return bb->capacity();
1744 }
1745
1746 \f
1747
1748 // Hash table of native methods.
1749 static JNINativeMethod *nathash;
1750 // Number of slots used.
1751 static int nathash_count = 0;
1752 // Number of slots available.  Must be power of 2.
1753 static int nathash_size = 0;
1754
1755 #define DELETED_ENTRY ((char *) (~0))
1756
1757 // Compute a hash value for a native method descriptor.
1758 static int
1759 hash (const JNINativeMethod *method)
1760 {
1761   char *ptr;
1762   int hash = 0;
1763
1764   ptr = method->name;
1765   while (*ptr)
1766     hash = (31 * hash) + *ptr++;
1767
1768   ptr = method->signature;
1769   while (*ptr)
1770     hash = (31 * hash) + *ptr++;
1771
1772   return hash;
1773 }
1774
1775 // Find the slot where a native method goes.
1776 static JNINativeMethod *
1777 nathash_find_slot (const JNINativeMethod *method)
1778 {
1779   jint h = hash (method);
1780   int step = (h ^ (h >> 16)) | 1;
1781   int w = h & (nathash_size - 1);
1782   int del = -1;
1783
1784   for (;;)
1785     {
1786       JNINativeMethod *slotp = &nathash[w];
1787       if (slotp->name == NULL)
1788         {
1789           if (del >= 0)
1790             return &nathash[del];
1791           else
1792             return slotp;
1793         }
1794       else if (slotp->name == DELETED_ENTRY)
1795         del = w;
1796       else if (! strcmp (slotp->name, method->name)
1797                && ! strcmp (slotp->signature, method->signature))
1798         return slotp;
1799       w = (w + step) & (nathash_size - 1);
1800     }
1801 }
1802
1803 // Find a method.  Return NULL if it isn't in the hash table.
1804 static void *
1805 nathash_find (JNINativeMethod *method)
1806 {
1807   if (nathash == NULL)
1808     return NULL;
1809   JNINativeMethod *slot = nathash_find_slot (method);
1810   if (slot->name == NULL || slot->name == DELETED_ENTRY)
1811     return NULL;
1812   return slot->fnPtr;
1813 }
1814
1815 static void
1816 natrehash ()
1817 {
1818   if (nathash == NULL)
1819     {
1820       nathash_size = 1024;
1821       nathash =
1822         (JNINativeMethod *) _Jv_AllocBytes (nathash_size
1823                                             * sizeof (JNINativeMethod));
1824       memset (nathash, 0, nathash_size * sizeof (JNINativeMethod));
1825     }
1826   else
1827     {
1828       int savesize = nathash_size;
1829       JNINativeMethod *savehash = nathash;
1830       nathash_size *= 2;
1831       nathash =
1832         (JNINativeMethod *) _Jv_AllocBytes (nathash_size
1833                                             * sizeof (JNINativeMethod));
1834       memset (nathash, 0, nathash_size * sizeof (JNINativeMethod));
1835
1836       for (int i = 0; i < savesize; ++i)
1837         {
1838           if (savehash[i].name != NULL && savehash[i].name != DELETED_ENTRY)
1839             {
1840               JNINativeMethod *slot = nathash_find_slot (&savehash[i]);
1841               *slot = savehash[i];
1842             }
1843         }
1844     }
1845 }
1846
1847 static void
1848 nathash_add (const JNINativeMethod *method)
1849 {
1850   if (3 * nathash_count >= 2 * nathash_size)
1851     natrehash ();
1852   JNINativeMethod *slot = nathash_find_slot (method);
1853   // If the slot has a real entry in it, then there is no work to do.
1854   if (slot->name != NULL && slot->name != DELETED_ENTRY)
1855     return;
1856   // FIXME
1857   slot->name = strdup (method->name);
1858   slot->signature = strdup (method->signature);
1859   slot->fnPtr = method->fnPtr;
1860 }
1861
1862 static jint JNICALL
1863 _Jv_JNI_RegisterNatives (JNIEnv *env, jclass klass,
1864                          const JNINativeMethod *methods,
1865                          jint nMethods)
1866 {
1867   // Synchronize while we do the work.  This must match
1868   // synchronization in some other functions that manipulate or use
1869   // the nathash table.
1870   JvSynchronize sync (global_ref_table);
1871
1872   // Look at each descriptor given us, and find the corresponding
1873   // method in the class.
1874   for (int j = 0; j < nMethods; ++j)
1875     {
1876       bool found = false;
1877
1878       _Jv_Method *imeths = JvGetFirstMethod (klass);
1879       for (int i = 0; i < JvNumMethods (klass); ++i)
1880         {
1881           _Jv_Method *self = &imeths[i];
1882
1883           if (! strcmp (self->name->chars (), methods[j].name)
1884               && ! strcmp (self->signature->chars (), methods[j].signature))
1885             {
1886               if (! (self->accflags & java::lang::reflect::Modifier::NATIVE))
1887                 break;
1888
1889               // Found a match that is native.
1890               found = true;
1891               nathash_add (&methods[j]);
1892
1893               break;
1894             }
1895         }
1896
1897       if (! found)
1898         {
1899           jstring m = JvNewStringUTF (methods[j].name);
1900           try
1901             {
1902               env->ex = new java::lang::NoSuchMethodError (m);
1903             }
1904           catch (jthrowable t)
1905             {
1906               env->ex = t;
1907             }
1908           return JNI_ERR;
1909         }
1910     }
1911
1912   return JNI_OK;
1913 }
1914
1915 static jint JNICALL
1916 _Jv_JNI_UnregisterNatives (JNIEnv *, jclass)
1917 {
1918   // FIXME -- we could implement this.
1919   return JNI_ERR;
1920 }
1921
1922 \f
1923
1924 // Add a character to the buffer, encoding properly.
1925 static void
1926 add_char (char *buf, jchar c, int *here)
1927 {
1928   if (c == '_')
1929     {
1930       buf[(*here)++] = '_';
1931       buf[(*here)++] = '1';
1932     }
1933   else if (c == ';')
1934     {
1935       buf[(*here)++] = '_';
1936       buf[(*here)++] = '2';
1937     }
1938   else if (c == '[')
1939     {
1940       buf[(*here)++] = '_';
1941       buf[(*here)++] = '3';
1942     }
1943
1944   // Also check for `.' here because we might be passed an internal
1945   // qualified class name like `foo.bar'.
1946   else if (c == '/' || c == '.')
1947     buf[(*here)++] = '_';
1948   else if ((c >= '0' && c <= '9')
1949            || (c >= 'a' && c <= 'z')
1950            || (c >= 'A' && c <= 'Z'))
1951     buf[(*here)++] = (char) c;
1952   else
1953     {
1954       // "Unicode" character.
1955       buf[(*here)++] = '_';
1956       buf[(*here)++] = '0';
1957       for (int i = 0; i < 4; ++i)
1958         {
1959           int val = c & 0x0f;
1960           buf[(*here) + 3 - i] = (val > 10) ? ('a' + val - 10) : ('0' + val);
1961           c >>= 4;
1962         }
1963       *here += 4;
1964     }
1965 }
1966
1967 // Compute a mangled name for a native function.  This computes the
1968 // long name, and also returns an index which indicates where a NUL
1969 // can be placed to create the short name.  This function assumes that
1970 // the buffer is large enough for its results.
1971 static void
1972 mangled_name (jclass klass, _Jv_Utf8Const *func_name,
1973               _Jv_Utf8Const *signature, char *buf, int *long_start)
1974 {
1975   strcpy (buf, "Java_");
1976   int here = 5;
1977
1978   // Add fully qualified class name.
1979   jchar *chars = _Jv_GetStringChars (klass->getName ());
1980   jint len = klass->getName ()->length ();
1981   for (int i = 0; i < len; ++i)
1982     add_char (buf, chars[i], &here);
1983
1984   // Don't use add_char because we need a literal `_'.
1985   buf[here++] = '_';
1986
1987   const unsigned char *fn = (const unsigned char *) func_name->chars ();
1988   const unsigned char *limit = fn + func_name->len ();
1989   for (int i = 0; ; ++i)
1990     {
1991       int ch = UTF8_GET (fn, limit);
1992       if (ch < 0)
1993         break;
1994       add_char (buf, ch, &here);
1995     }
1996
1997   // This is where the long signature begins.
1998   *long_start = here;
1999   buf[here++] = '_';
2000   buf[here++] = '_';
2001
2002   const unsigned char *sig = (const unsigned char *) signature->chars ();
2003   limit = sig + signature->len ();
2004   JvAssert (sig[0] == '(');
2005   ++sig;
2006   while (1)
2007     {
2008       int ch = UTF8_GET (sig, limit);
2009       if (ch == ')' || ch < 0)
2010         break;
2011       add_char (buf, ch, &here);
2012     }
2013
2014   buf[here] = '\0';
2015 }
2016
2017 // Return the current thread's JNIEnv; if one does not exist, create
2018 // it.  Also create a new system frame for use.  This is `extern "C"'
2019 // because the compiler calls it.
2020 extern "C" JNIEnv *
2021 _Jv_GetJNIEnvNewFrame (jclass klass)
2022 {
2023   JNIEnv *env = _Jv_GetCurrentJNIEnv ();
2024   if (env == NULL)
2025     {
2026       env = (JNIEnv *) _Jv_MallocUnchecked (sizeof (JNIEnv));
2027       env->p = &_Jv_JNIFunctions;
2028       env->klass = klass;
2029       env->locals = NULL;
2030       // We set env->ex below.
2031
2032       _Jv_SetCurrentJNIEnv (env);
2033     }
2034
2035   _Jv_JNI_LocalFrame *frame
2036     = (_Jv_JNI_LocalFrame *) _Jv_MallocUnchecked (sizeof (_Jv_JNI_LocalFrame)
2037                                                   + (FRAME_SIZE
2038                                                      * sizeof (jobject)));
2039
2040   frame->marker = MARK_SYSTEM;
2041   frame->size = FRAME_SIZE;
2042   frame->next = env->locals;
2043
2044   for (int i = 0; i < frame->size; ++i)
2045     frame->vec[i] = NULL;
2046
2047   env->locals = frame;
2048   env->ex = NULL;
2049
2050   return env;
2051 }
2052
2053 // Return the function which implements a particular JNI method.  If
2054 // we can't find the function, we throw the appropriate exception.
2055 // This is `extern "C"' because the compiler uses it.
2056 extern "C" void *
2057 _Jv_LookupJNIMethod (jclass klass, _Jv_Utf8Const *name,
2058                      _Jv_Utf8Const *signature, MAYBE_UNUSED int args_size)
2059 {
2060   int name_length = name->len();
2061   int sig_length = signature->len();
2062   char buf[10 + 6 * (name_length + sig_length) + 12];
2063   int long_start;
2064   void *function;
2065
2066   // Synchronize on something convenient.  Right now we use the hash.
2067   JvSynchronize sync (global_ref_table);
2068
2069   // First see if we have an override in the hash table.
2070   strncpy (buf, name->chars (), name_length);
2071   buf[name_length] = '\0';
2072   strncpy (buf + name_length + 1, signature->chars (), sig_length);
2073   buf[name_length + sig_length + 1] = '\0';
2074   JNINativeMethod meth;
2075   meth.name = buf;
2076   meth.signature = buf + name_length + 1;
2077   function = nathash_find (&meth);
2078   if (function != NULL)
2079     return function;
2080
2081   // If there was no override, then look in the symbol table.
2082   buf[0] = '_';
2083   mangled_name (klass, name, signature, buf + 1, &long_start);
2084   char c = buf[long_start + 1];
2085   buf[long_start + 1] = '\0';
2086
2087   function = _Jv_FindSymbolInExecutable (buf + 1);
2088 #ifdef WIN32
2089   // On Win32, we use the "stdcall" calling convention (see JNICALL
2090   // in jni.h).
2091   //
2092   // For a function named 'fooBar' that takes 'nn' bytes as arguments,
2093   // by default, MinGW GCC exports it as 'fooBar@nn', MSVC exports it
2094   // as '_fooBar@nn' and Borland C exports it as 'fooBar'. We try to
2095   // take care of all these variations here.
2096
2097   char asz_buf[12];    /* '@' + '2147483647' (32-bit INT_MAX) + '\0' */
2098   char long_nm_sv[11]; /* Ditto, except for the '\0'. */
2099
2100   if (function == NULL)
2101     {
2102       // We have tried searching for the 'fooBar' form (BCC) - now
2103       // try the others.
2104
2105       // First, save the part of the long name that will be damaged
2106       // by appending '@nn'.
2107       memcpy (long_nm_sv, (buf + long_start + 1 + 1), sizeof (long_nm_sv));
2108
2109       sprintf (asz_buf, "@%d", args_size);
2110       strcat (buf, asz_buf);
2111
2112       // Search for the '_fooBar@nn' form (MSVC).
2113       function = _Jv_FindSymbolInExecutable (buf);
2114
2115       if (function == NULL)
2116         {
2117           // Search for the 'fooBar@nn' form (MinGW GCC).
2118           function = _Jv_FindSymbolInExecutable (buf + 1);
2119         }
2120     }
2121 #endif /* WIN32 */
2122
2123   if (function == NULL)
2124     {
2125       buf[long_start + 1] = c;
2126 #ifdef WIN32
2127       // Restore the part of the long name that was damaged by
2128       // appending the '@nn'.
2129       memcpy ((buf + long_start + 1 + 1), long_nm_sv, sizeof (long_nm_sv));
2130 #endif /* WIN32 */
2131       function = _Jv_FindSymbolInExecutable (buf + 1);
2132       if (function == NULL)
2133         {
2134 #ifdef WIN32
2135           strcat (buf, asz_buf);
2136           function = _Jv_FindSymbolInExecutable (buf);
2137           if (function == NULL)
2138             function = _Jv_FindSymbolInExecutable (buf + 1);
2139
2140           if (function == NULL)
2141 #endif /* WIN32 */
2142             {
2143               jstring str = JvNewStringUTF (name->chars ());
2144               throw new java::lang::UnsatisfiedLinkError (str);
2145             }
2146         }
2147     }
2148
2149   return function;
2150 }
2151
2152 #ifdef INTERPRETER
2153
2154 // This function is the stub which is used to turn an ordinary (CNI)
2155 // method call into a JNI call.
2156 void
2157 _Jv_JNIMethod::call (ffi_cif *, void *ret, ffi_raw *args, void *__this)
2158 {
2159   _Jv_JNIMethod* _this = (_Jv_JNIMethod *) __this;
2160
2161   JNIEnv *env = _Jv_GetJNIEnvNewFrame (_this->defining_class);
2162
2163   // FIXME: we should mark every reference parameter as a local.  For
2164   // now we assume a conservative GC, and we assume that the
2165   // references are on the stack somewhere.
2166
2167   // We cache the value that we find, of course, but if we don't find
2168   // a value we don't cache that fact -- we might subsequently load a
2169   // library which finds the function in question.
2170   {
2171     // Synchronize on a convenient object to ensure sanity in case two
2172     // threads reach this point for the same function at the same
2173     // time.
2174     JvSynchronize sync (global_ref_table);
2175     if (_this->function == NULL)
2176       {
2177         int args_size = sizeof (JNIEnv *) + _this->args_raw_size;
2178
2179         if (_this->self->accflags & java::lang::reflect::Modifier::STATIC)
2180           args_size += sizeof (_this->defining_class);
2181
2182         _this->function = _Jv_LookupJNIMethod (_this->defining_class,
2183                                                _this->self->name,
2184                                                _this->self->signature,
2185                                                args_size);
2186       }
2187   }
2188
2189   JvAssert (_this->args_raw_size % sizeof (ffi_raw) == 0);
2190   ffi_raw real_args[2 + _this->args_raw_size / sizeof (ffi_raw)];
2191   int offset = 0;
2192
2193   // First argument is always the environment pointer.
2194   real_args[offset++].ptr = env;
2195
2196   // For a static method, we pass in the Class.  For non-static
2197   // methods, the `this' argument is already handled.
2198   if ((_this->self->accflags & java::lang::reflect::Modifier::STATIC))
2199     real_args[offset++].ptr = _this->defining_class;
2200
2201   // In libgcj, the callee synchronizes.
2202   jobject sync = NULL;
2203   if ((_this->self->accflags & java::lang::reflect::Modifier::SYNCHRONIZED))
2204     {
2205       if ((_this->self->accflags & java::lang::reflect::Modifier::STATIC))
2206         sync = _this->defining_class;
2207       else
2208         sync = (jobject) args[0].ptr;
2209       _Jv_MonitorEnter (sync);
2210     }
2211
2212   // Copy over passed-in arguments.
2213   memcpy (&real_args[offset], args, _this->args_raw_size);
2214
2215   // The actual call to the JNI function.
2216   ffi_raw_call (&_this->jni_cif, (void (*)()) _this->function,
2217                 ret, real_args);
2218
2219   if (sync != NULL)
2220     _Jv_MonitorExit (sync);
2221
2222   _Jv_JNI_PopSystemFrame (env);
2223 }
2224
2225 #endif /* INTERPRETER */
2226
2227 \f
2228
2229 //
2230 // Invocation API.
2231 //
2232
2233 // An internal helper function.
2234 static jint
2235 _Jv_JNI_AttachCurrentThread (JavaVM *, jstring name, void **penv,
2236                              void *args, jboolean is_daemon)
2237 {
2238   JavaVMAttachArgs *attach = reinterpret_cast<JavaVMAttachArgs *> (args);
2239   java::lang::ThreadGroup *group = NULL;
2240
2241   if (attach)
2242     {
2243       // FIXME: do we really want to support 1.1?
2244       if (attach->version != JNI_VERSION_1_4
2245           && attach->version != JNI_VERSION_1_2
2246           && attach->version != JNI_VERSION_1_1)
2247         return JNI_EVERSION;
2248
2249       JvAssert (java::lang::ThreadGroup::class$.isInstance (attach->group));
2250       group = reinterpret_cast<java::lang::ThreadGroup *> (attach->group);
2251     }
2252
2253   // Attaching an already-attached thread is a no-op.
2254   if (_Jv_GetCurrentJNIEnv () != NULL)
2255     return 0;
2256
2257   JNIEnv *env = (JNIEnv *) _Jv_MallocUnchecked (sizeof (JNIEnv));
2258   if (env == NULL)
2259     return JNI_ERR;
2260   env->p = &_Jv_JNIFunctions;
2261   env->ex = NULL;
2262   env->klass = NULL;
2263   env->locals
2264     = (_Jv_JNI_LocalFrame *) _Jv_MallocUnchecked (sizeof (_Jv_JNI_LocalFrame)
2265                                                   + (FRAME_SIZE
2266                                                      * sizeof (jobject)));
2267   if (env->locals == NULL)
2268     {
2269       _Jv_Free (env);
2270       return JNI_ERR;
2271     }
2272
2273   env->locals->marker = MARK_SYSTEM;
2274   env->locals->size = FRAME_SIZE;
2275   env->locals->next = NULL;
2276
2277   for (int i = 0; i < env->locals->size; ++i)
2278     env->locals->vec[i] = NULL;
2279
2280   *penv = reinterpret_cast<void *> (env);
2281
2282   // This thread might already be a Java thread -- this function might
2283   // have been called simply to set the new JNIEnv.
2284   if (_Jv_ThreadCurrent () == NULL)
2285     {
2286       try
2287         {
2288           if (is_daemon)
2289             _Jv_AttachCurrentThreadAsDaemon (name, group);
2290           else
2291             _Jv_AttachCurrentThread (name, group);
2292         }
2293       catch (jthrowable t)
2294         {
2295           return JNI_ERR;
2296         }
2297     }
2298   _Jv_SetCurrentJNIEnv (env);
2299
2300   return 0;
2301 }
2302
2303 // This is the one actually used by JNI.
2304 static jint JNICALL
2305 _Jv_JNI_AttachCurrentThread (JavaVM *vm, void **penv, void *args)
2306 {
2307   return _Jv_JNI_AttachCurrentThread (vm, NULL, penv, args, false);
2308 }
2309
2310 static jint JNICALL
2311 _Jv_JNI_AttachCurrentThreadAsDaemon (JavaVM *vm, void **penv,
2312                                      void *args)
2313 {
2314   return _Jv_JNI_AttachCurrentThread (vm, NULL, penv, args, true);
2315 }
2316
2317 static jint JNICALL
2318 _Jv_JNI_DestroyJavaVM (JavaVM *vm)
2319 {
2320   JvAssert (the_vm && vm == the_vm);
2321
2322   JNIEnv *env;
2323   if (_Jv_ThreadCurrent () != NULL)
2324     {
2325       jstring main_name;
2326       // This sucks.
2327       try
2328         {
2329           main_name = JvNewStringLatin1 ("main");
2330         }
2331       catch (jthrowable t)
2332         {
2333           return JNI_ERR;
2334         }
2335
2336       jint r = _Jv_JNI_AttachCurrentThread (vm, main_name,
2337                                             reinterpret_cast<void **> (&env),
2338                                             NULL, false);
2339       if (r < 0)
2340         return r;
2341     }
2342   else
2343     env = _Jv_GetCurrentJNIEnv ();
2344
2345   _Jv_ThreadWait ();
2346
2347   // Docs say that this always returns an error code.
2348   return JNI_ERR;
2349 }
2350
2351 jint JNICALL
2352 _Jv_JNI_DetachCurrentThread (JavaVM *)
2353 {
2354   jint code = _Jv_DetachCurrentThread ();
2355   return code  ? JNI_EDETACHED : 0;
2356 }
2357
2358 static jint JNICALL
2359 _Jv_JNI_GetEnv (JavaVM *, void **penv, jint version)
2360 {
2361   if (_Jv_ThreadCurrent () == NULL)
2362     {
2363       *penv = NULL;
2364       return JNI_EDETACHED;
2365     }
2366
2367 #ifdef ENABLE_JVMPI
2368   // Handle JVMPI requests.
2369   if (version == JVMPI_VERSION_1)
2370     {
2371       *penv = (void *) &_Jv_JVMPI_Interface;
2372       return 0;
2373     }
2374 #endif
2375
2376   // FIXME: do we really want to support 1.1?
2377   if (version != JNI_VERSION_1_4 && version != JNI_VERSION_1_2
2378       && version != JNI_VERSION_1_1)
2379     {
2380       *penv = NULL;
2381       return JNI_EVERSION;
2382     }
2383
2384   *penv = (void *) _Jv_GetCurrentJNIEnv ();
2385   return 0;
2386 }
2387
2388 jint JNICALL
2389 JNI_GetDefaultJavaVMInitArgs (void *args)
2390 {
2391   jint version = * (jint *) args;
2392   // Here we only support 1.2 and 1.4.
2393   if (version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4)
2394     return JNI_EVERSION;
2395
2396   JavaVMInitArgs *ia = reinterpret_cast<JavaVMInitArgs *> (args);
2397   ia->version = JNI_VERSION_1_4;
2398   ia->nOptions = 0;
2399   ia->options = NULL;
2400   ia->ignoreUnrecognized = true;
2401
2402   return 0;
2403 }
2404
2405 jint JNICALL
2406 JNI_CreateJavaVM (JavaVM **vm, void **penv, void *args)
2407 {
2408   JvAssert (! the_vm);
2409
2410   _Jv_CreateJavaVM (NULL);
2411
2412   // FIXME: synchronize
2413   JavaVM *nvm = (JavaVM *) _Jv_MallocUnchecked (sizeof (JavaVM));
2414   if (nvm == NULL)
2415     return JNI_ERR;
2416   nvm->functions = &_Jv_JNI_InvokeFunctions;
2417
2418   // Parse the arguments.
2419   if (args != NULL)
2420     {
2421       jint version = * (jint *) args;
2422       // We only support 1.2 and 1.4.
2423       if (version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4)
2424         return JNI_EVERSION;
2425       JavaVMInitArgs *ia = reinterpret_cast<JavaVMInitArgs *> (args);
2426       for (int i = 0; i < ia->nOptions; ++i)
2427         {
2428           if (! strcmp (ia->options[i].optionString, "vfprintf")
2429               || ! strcmp (ia->options[i].optionString, "exit")
2430               || ! strcmp (ia->options[i].optionString, "abort"))
2431             {
2432               // We are required to recognize these, but for now we
2433               // don't handle them in any way.  FIXME.
2434               continue;
2435             }
2436           else if (! strncmp (ia->options[i].optionString,
2437                               "-verbose", sizeof ("-verbose") - 1))
2438             {
2439               // We don't do anything with this option either.  We
2440               // might want to make sure the argument is valid, but we
2441               // don't really care all that much for now.
2442               continue;
2443             }
2444           else if (! strncmp (ia->options[i].optionString, "-D", 2))
2445             {
2446               // FIXME.
2447               continue;
2448             }
2449           else if (ia->ignoreUnrecognized)
2450             {
2451               if (ia->options[i].optionString[0] == '_'
2452                   || ! strncmp (ia->options[i].optionString, "-X", 2))
2453                 continue;
2454             }
2455
2456           return JNI_ERR;
2457         }
2458     }
2459
2460   jint r =_Jv_JNI_AttachCurrentThread (nvm, penv, NULL);
2461   if (r < 0)
2462     return r;
2463
2464   the_vm = nvm;
2465   *vm = the_vm;
2466
2467   return 0;
2468 }
2469
2470 jint JNICALL
2471 JNI_GetCreatedJavaVMs (JavaVM **vm_buffer, jsize buf_len, jsize *n_vms)
2472 {
2473   if (buf_len <= 0)
2474     return JNI_ERR;
2475
2476   // We only support a single VM.
2477   if (the_vm != NULL)
2478     {
2479       vm_buffer[0] = the_vm;
2480       *n_vms = 1;
2481     }
2482   else
2483     *n_vms = 0;
2484   return 0;
2485 }
2486
2487 JavaVM *
2488 _Jv_GetJavaVM ()
2489 {
2490   // FIXME: synchronize
2491   if (! the_vm)
2492     {
2493       JavaVM *nvm = (JavaVM *) _Jv_MallocUnchecked (sizeof (JavaVM));
2494       if (nvm != NULL)
2495         nvm->functions = &_Jv_JNI_InvokeFunctions;
2496       the_vm = nvm;
2497     }
2498
2499   // If this is a Java thread, we want to make sure it has an
2500   // associated JNIEnv.
2501   if (_Jv_ThreadCurrent () != NULL)
2502     {
2503       void *ignore;
2504       _Jv_JNI_AttachCurrentThread (the_vm, &ignore, NULL);
2505     }
2506
2507   return the_vm;
2508 }
2509
2510 static jint JNICALL
2511 _Jv_JNI_GetJavaVM (JNIEnv *, JavaVM **vm)
2512 {
2513   *vm = _Jv_GetJavaVM ();
2514   return *vm == NULL ? JNI_ERR : JNI_OK;
2515 }
2516
2517 \f
2518
2519 #define RESERVED NULL
2520
2521 struct JNINativeInterface _Jv_JNIFunctions =
2522 {
2523   RESERVED,
2524   RESERVED,
2525   RESERVED,
2526   RESERVED,
2527   _Jv_JNI_GetVersion,           // GetVersion
2528   _Jv_JNI_DefineClass,          // DefineClass
2529   _Jv_JNI_FindClass,            // FindClass
2530   _Jv_JNI_FromReflectedMethod,  // FromReflectedMethod
2531   _Jv_JNI_FromReflectedField,   // FromReflectedField
2532   _Jv_JNI_ToReflectedMethod,    // ToReflectedMethod
2533   _Jv_JNI_GetSuperclass,        // GetSuperclass
2534   _Jv_JNI_IsAssignableFrom,     // IsAssignableFrom
2535   _Jv_JNI_ToReflectedField,     // ToReflectedField
2536   _Jv_JNI_Throw,                // Throw
2537   _Jv_JNI_ThrowNew,             // ThrowNew
2538   _Jv_JNI_ExceptionOccurred,    // ExceptionOccurred
2539   _Jv_JNI_ExceptionDescribe,    // ExceptionDescribe
2540   _Jv_JNI_ExceptionClear,       // ExceptionClear
2541   _Jv_JNI_FatalError,           // FatalError
2542
2543   _Jv_JNI_PushLocalFrame,       // PushLocalFrame
2544   _Jv_JNI_PopLocalFrame,        // PopLocalFrame
2545   _Jv_JNI_NewGlobalRef,         // NewGlobalRef
2546   _Jv_JNI_DeleteGlobalRef,      // DeleteGlobalRef
2547   _Jv_JNI_DeleteLocalRef,       // DeleteLocalRef
2548
2549   _Jv_JNI_IsSameObject,         // IsSameObject
2550
2551   _Jv_JNI_NewLocalRef,          // NewLocalRef
2552   _Jv_JNI_EnsureLocalCapacity,  // EnsureLocalCapacity
2553
2554   _Jv_JNI_AllocObject,              // AllocObject
2555   _Jv_JNI_NewObject,                // NewObject
2556   _Jv_JNI_NewObjectV,               // NewObjectV
2557   _Jv_JNI_NewObjectA,               // NewObjectA
2558   _Jv_JNI_GetObjectClass,           // GetObjectClass
2559   _Jv_JNI_IsInstanceOf,             // IsInstanceOf
2560   _Jv_JNI_GetAnyMethodID<false>,    // GetMethodID
2561
2562   _Jv_JNI_CallMethod<jobject>,          // CallObjectMethod
2563   _Jv_JNI_CallMethodV<jobject>,         // CallObjectMethodV
2564   _Jv_JNI_CallMethodA<jobject>,         // CallObjectMethodA
2565   _Jv_JNI_CallMethod<jboolean>,         // CallBooleanMethod
2566   _Jv_JNI_CallMethodV<jboolean>,        // CallBooleanMethodV
2567   _Jv_JNI_CallMethodA<jboolean>,        // CallBooleanMethodA
2568   _Jv_JNI_CallMethod<jbyte>,            // CallByteMethod
2569   _Jv_JNI_CallMethodV<jbyte>,           // CallByteMethodV
2570   _Jv_JNI_CallMethodA<jbyte>,           // CallByteMethodA
2571   _Jv_JNI_CallMethod<jchar>,            // CallCharMethod
2572   _Jv_JNI_CallMethodV<jchar>,           // CallCharMethodV
2573   _Jv_JNI_CallMethodA<jchar>,           // CallCharMethodA
2574   _Jv_JNI_CallMethod<jshort>,           // CallShortMethod
2575   _Jv_JNI_CallMethodV<jshort>,          // CallShortMethodV
2576   _Jv_JNI_CallMethodA<jshort>,          // CallShortMethodA
2577   _Jv_JNI_CallMethod<jint>,             // CallIntMethod
2578   _Jv_JNI_CallMethodV<jint>,            // CallIntMethodV
2579   _Jv_JNI_CallMethodA<jint>,            // CallIntMethodA
2580   _Jv_JNI_CallMethod<jlong>,            // CallLongMethod
2581   _Jv_JNI_CallMethodV<jlong>,           // CallLongMethodV
2582   _Jv_JNI_CallMethodA<jlong>,           // CallLongMethodA
2583   _Jv_JNI_CallMethod<jfloat>,           // CallFloatMethod
2584   _Jv_JNI_CallMethodV<jfloat>,          // CallFloatMethodV
2585   _Jv_JNI_CallMethodA<jfloat>,          // CallFloatMethodA
2586   _Jv_JNI_CallMethod<jdouble>,          // CallDoubleMethod
2587   _Jv_JNI_CallMethodV<jdouble>,         // CallDoubleMethodV
2588   _Jv_JNI_CallMethodA<jdouble>,         // CallDoubleMethodA
2589   _Jv_JNI_CallVoidMethod,               // CallVoidMethod
2590   _Jv_JNI_CallVoidMethodV,              // CallVoidMethodV
2591   _Jv_JNI_CallVoidMethodA,              // CallVoidMethodA
2592
2593   // Nonvirtual method invocation functions follow.
2594   _Jv_JNI_CallAnyMethod<jobject, nonvirtual>,   // CallNonvirtualObjectMethod
2595   _Jv_JNI_CallAnyMethodV<jobject, nonvirtual>,  // CallNonvirtualObjectMethodV
2596   _Jv_JNI_CallAnyMethodA<jobject, nonvirtual>,  // CallNonvirtualObjectMethodA
2597   _Jv_JNI_CallAnyMethod<jboolean, nonvirtual>,  // CallNonvirtualBooleanMethod
2598   _Jv_JNI_CallAnyMethodV<jboolean, nonvirtual>, // CallNonvirtualBooleanMethodV
2599   _Jv_JNI_CallAnyMethodA<jboolean, nonvirtual>, // CallNonvirtualBooleanMethodA
2600   _Jv_JNI_CallAnyMethod<jbyte, nonvirtual>,     // CallNonvirtualByteMethod
2601   _Jv_JNI_CallAnyMethodV<jbyte, nonvirtual>,    // CallNonvirtualByteMethodV
2602   _Jv_JNI_CallAnyMethodA<jbyte, nonvirtual>,    // CallNonvirtualByteMethodA
2603   _Jv_JNI_CallAnyMethod<jchar, nonvirtual>,     // CallNonvirtualCharMethod
2604   _Jv_JNI_CallAnyMethodV<jchar, nonvirtual>,    // CallNonvirtualCharMethodV
2605   _Jv_JNI_CallAnyMethodA<jchar, nonvirtual>,    // CallNonvirtualCharMethodA
2606   _Jv_JNI_CallAnyMethod<jshort, nonvirtual>,    // CallNonvirtualShortMethod
2607   _Jv_JNI_CallAnyMethodV<jshort, nonvirtual>,   // CallNonvirtualShortMethodV
2608   _Jv_JNI_CallAnyMethodA<jshort, nonvirtual>,   // CallNonvirtualShortMethodA
2609   _Jv_JNI_CallAnyMethod<jint, nonvirtual>,      // CallNonvirtualIntMethod
2610   _Jv_JNI_CallAnyMethodV<jint, nonvirtual>,     // CallNonvirtualIntMethodV
2611   _Jv_JNI_CallAnyMethodA<jint, nonvirtual>,     // CallNonvirtualIntMethodA
2612   _Jv_JNI_CallAnyMethod<jlong, nonvirtual>,     // CallNonvirtualLongMethod
2613   _Jv_JNI_CallAnyMethodV<jlong, nonvirtual>,    // CallNonvirtualLongMethodV
2614   _Jv_JNI_CallAnyMethodA<jlong, nonvirtual>,    // CallNonvirtualLongMethodA
2615   _Jv_JNI_CallAnyMethod<jfloat, nonvirtual>,    // CallNonvirtualFloatMethod
2616   _Jv_JNI_CallAnyMethodV<jfloat, nonvirtual>,   // CallNonvirtualFloatMethodV
2617   _Jv_JNI_CallAnyMethodA<jfloat, nonvirtual>,   // CallNonvirtualFloatMethodA
2618   _Jv_JNI_CallAnyMethod<jdouble, nonvirtual>,   // CallNonvirtualDoubleMethod
2619   _Jv_JNI_CallAnyMethodV<jdouble, nonvirtual>,  // CallNonvirtualDoubleMethodV
2620   _Jv_JNI_CallAnyMethodA<jdouble, nonvirtual>,  // CallNonvirtualDoubleMethodA
2621   _Jv_JNI_CallAnyVoidMethod<nonvirtual>,        // CallNonvirtualVoidMethod
2622   _Jv_JNI_CallAnyVoidMethodV<nonvirtual>,       // CallNonvirtualVoidMethodV
2623   _Jv_JNI_CallAnyVoidMethodA<nonvirtual>,       // CallNonvirtualVoidMethodA
2624
2625   _Jv_JNI_GetAnyFieldID<false>, // GetFieldID
2626   _Jv_JNI_GetField<jobject>,    // GetObjectField
2627   _Jv_JNI_GetField<jboolean>,   // GetBooleanField
2628   _Jv_JNI_GetField<jbyte>,      // GetByteField
2629   _Jv_JNI_GetField<jchar>,      // GetCharField
2630   _Jv_JNI_GetField<jshort>,     // GetShortField
2631   _Jv_JNI_GetField<jint>,       // GetIntField
2632   _Jv_JNI_GetField<jlong>,      // GetLongField
2633   _Jv_JNI_GetField<jfloat>,     // GetFloatField
2634   _Jv_JNI_GetField<jdouble>,    // GetDoubleField
2635   _Jv_JNI_SetField,             // SetObjectField
2636   _Jv_JNI_SetField,             // SetBooleanField
2637   _Jv_JNI_SetField,             // SetByteField
2638   _Jv_JNI_SetField,             // SetCharField
2639   _Jv_JNI_SetField,             // SetShortField
2640   _Jv_JNI_SetField,             // SetIntField
2641   _Jv_JNI_SetField,             // SetLongField
2642   _Jv_JNI_SetField,             // SetFloatField
2643   _Jv_JNI_SetField,             // SetDoubleField
2644   _Jv_JNI_GetAnyMethodID<true>, // GetStaticMethodID
2645
2646   _Jv_JNI_CallStaticMethod<jobject>,      // CallStaticObjectMethod
2647   _Jv_JNI_CallStaticMethodV<jobject>,     // CallStaticObjectMethodV
2648   _Jv_JNI_CallStaticMethodA<jobject>,     // CallStaticObjectMethodA
2649   _Jv_JNI_CallStaticMethod<jboolean>,     // CallStaticBooleanMethod
2650   _Jv_JNI_CallStaticMethodV<jboolean>,    // CallStaticBooleanMethodV
2651   _Jv_JNI_CallStaticMethodA<jboolean>,    // CallStaticBooleanMethodA
2652   _Jv_JNI_CallStaticMethod<jbyte>,        // CallStaticByteMethod
2653   _Jv_JNI_CallStaticMethodV<jbyte>,       // CallStaticByteMethodV
2654   _Jv_JNI_CallStaticMethodA<jbyte>,       // CallStaticByteMethodA
2655   _Jv_JNI_CallStaticMethod<jchar>,        // CallStaticCharMethod
2656   _Jv_JNI_CallStaticMethodV<jchar>,       // CallStaticCharMethodV
2657   _Jv_JNI_CallStaticMethodA<jchar>,       // CallStaticCharMethodA
2658   _Jv_JNI_CallStaticMethod<jshort>,       // CallStaticShortMethod
2659   _Jv_JNI_CallStaticMethodV<jshort>,      // CallStaticShortMethodV
2660   _Jv_JNI_CallStaticMethodA<jshort>,      // CallStaticShortMethodA
2661   _Jv_JNI_CallStaticMethod<jint>,         // CallStaticIntMethod
2662   _Jv_JNI_CallStaticMethodV<jint>,        // CallStaticIntMethodV
2663   _Jv_JNI_CallStaticMethodA<jint>,        // CallStaticIntMethodA
2664   _Jv_JNI_CallStaticMethod<jlong>,        // CallStaticLongMethod
2665   _Jv_JNI_CallStaticMethodV<jlong>,       // CallStaticLongMethodV
2666   _Jv_JNI_CallStaticMethodA<jlong>,       // CallStaticLongMethodA
2667   _Jv_JNI_CallStaticMethod<jfloat>,       // CallStaticFloatMethod
2668   _Jv_JNI_CallStaticMethodV<jfloat>,      // CallStaticFloatMethodV
2669   _Jv_JNI_CallStaticMethodA<jfloat>,      // CallStaticFloatMethodA
2670   _Jv_JNI_CallStaticMethod<jdouble>,      // CallStaticDoubleMethod
2671   _Jv_JNI_CallStaticMethodV<jdouble>,     // CallStaticDoubleMethodV
2672   _Jv_JNI_CallStaticMethodA<jdouble>,     // CallStaticDoubleMethodA
2673   _Jv_JNI_CallStaticVoidMethod,           // CallStaticVoidMethod
2674   _Jv_JNI_CallStaticVoidMethodV,          // CallStaticVoidMethodV
2675   _Jv_JNI_CallStaticVoidMethodA,          // CallStaticVoidMethodA
2676
2677   _Jv_JNI_GetAnyFieldID<true>,         // GetStaticFieldID
2678   _Jv_JNI_GetStaticField<jobject>,     // GetStaticObjectField
2679   _Jv_JNI_GetStaticField<jboolean>,    // GetStaticBooleanField
2680   _Jv_JNI_GetStaticField<jbyte>,       // GetStaticByteField
2681   _Jv_JNI_GetStaticField<jchar>,       // GetStaticCharField
2682   _Jv_JNI_GetStaticField<jshort>,      // GetStaticShortField
2683   _Jv_JNI_GetStaticField<jint>,        // GetStaticIntField
2684   _Jv_JNI_GetStaticField<jlong>,       // GetStaticLongField
2685   _Jv_JNI_GetStaticField<jfloat>,      // GetStaticFloatField
2686   _Jv_JNI_GetStaticField<jdouble>,     // GetStaticDoubleField
2687   _Jv_JNI_SetStaticField,              // SetStaticObjectField
2688   _Jv_JNI_SetStaticField,              // SetStaticBooleanField
2689   _Jv_JNI_SetStaticField,              // SetStaticByteField
2690   _Jv_JNI_SetStaticField,              // SetStaticCharField
2691   _Jv_JNI_SetStaticField,              // SetStaticShortField
2692   _Jv_JNI_SetStaticField,              // SetStaticIntField
2693   _Jv_JNI_SetStaticField,              // SetStaticLongField
2694   _Jv_JNI_SetStaticField,              // SetStaticFloatField
2695   _Jv_JNI_SetStaticField,              // SetStaticDoubleField
2696   _Jv_JNI_NewString,                   // NewString
2697   _Jv_JNI_GetStringLength,             // GetStringLength
2698   _Jv_JNI_GetStringChars,              // GetStringChars
2699   _Jv_JNI_ReleaseStringChars,          // ReleaseStringChars
2700   _Jv_JNI_NewStringUTF,                // NewStringUTF
2701   _Jv_JNI_GetStringUTFLength,          // GetStringUTFLength
2702   _Jv_JNI_GetStringUTFChars,           // GetStringUTFChars
2703   _Jv_JNI_ReleaseStringUTFChars,       // ReleaseStringUTFChars
2704   _Jv_JNI_GetArrayLength,              // GetArrayLength
2705   _Jv_JNI_NewObjectArray,              // NewObjectArray
2706   _Jv_JNI_GetObjectArrayElement,       // GetObjectArrayElement
2707   _Jv_JNI_SetObjectArrayElement,       // SetObjectArrayElement
2708   _Jv_JNI_NewPrimitiveArray<jboolean, JvPrimClass (boolean)>,
2709                                                             // NewBooleanArray
2710   _Jv_JNI_NewPrimitiveArray<jbyte, JvPrimClass (byte)>,     // NewByteArray
2711   _Jv_JNI_NewPrimitiveArray<jchar, JvPrimClass (char)>,     // NewCharArray
2712   _Jv_JNI_NewPrimitiveArray<jshort, JvPrimClass (short)>,   // NewShortArray
2713   _Jv_JNI_NewPrimitiveArray<jint, JvPrimClass (int)>,       // NewIntArray
2714   _Jv_JNI_NewPrimitiveArray<jlong, JvPrimClass (long)>,     // NewLongArray
2715   _Jv_JNI_NewPrimitiveArray<jfloat, JvPrimClass (float)>,   // NewFloatArray
2716   _Jv_JNI_NewPrimitiveArray<jdouble, JvPrimClass (double)>, // NewDoubleArray
2717   _Jv_JNI_GetPrimitiveArrayElements<jboolean, JvPrimClass (boolean)>,
2718                                             // GetBooleanArrayElements
2719   _Jv_JNI_GetPrimitiveArrayElements<jbyte, JvPrimClass (byte)>,
2720                                             // GetByteArrayElements
2721   _Jv_JNI_GetPrimitiveArrayElements<jchar, JvPrimClass (char)>,
2722                                             // GetCharArrayElements
2723   _Jv_JNI_GetPrimitiveArrayElements<jshort, JvPrimClass (short)>,
2724                                             // GetShortArrayElements
2725   _Jv_JNI_GetPrimitiveArrayElements<jint, JvPrimClass (int)>,
2726                                             // GetIntArrayElements
2727   _Jv_JNI_GetPrimitiveArrayElements<jlong, JvPrimClass (long)>,
2728                                             // GetLongArrayElements
2729   _Jv_JNI_GetPrimitiveArrayElements<jfloat, JvPrimClass (float)>,
2730                                             // GetFloatArrayElements
2731   _Jv_JNI_GetPrimitiveArrayElements<jdouble, JvPrimClass (double)>,
2732                                             // GetDoubleArrayElements
2733   _Jv_JNI_ReleasePrimitiveArrayElements<jboolean, JvPrimClass (boolean)>,
2734                                             // ReleaseBooleanArrayElements
2735   _Jv_JNI_ReleasePrimitiveArrayElements<jbyte, JvPrimClass (byte)>,
2736                                             // ReleaseByteArrayElements
2737   _Jv_JNI_ReleasePrimitiveArrayElements<jchar, JvPrimClass (char)>,
2738                                             // ReleaseCharArrayElements
2739   _Jv_JNI_ReleasePrimitiveArrayElements<jshort, JvPrimClass (short)>,
2740                                             // ReleaseShortArrayElements
2741   _Jv_JNI_ReleasePrimitiveArrayElements<jint, JvPrimClass (int)>,
2742                                             // ReleaseIntArrayElements
2743   _Jv_JNI_ReleasePrimitiveArrayElements<jlong, JvPrimClass (long)>,
2744                                             // ReleaseLongArrayElements
2745   _Jv_JNI_ReleasePrimitiveArrayElements<jfloat, JvPrimClass (float)>,
2746                                             // ReleaseFloatArrayElements
2747   _Jv_JNI_ReleasePrimitiveArrayElements<jdouble, JvPrimClass (double)>,
2748                                             // ReleaseDoubleArrayElements
2749   _Jv_JNI_GetPrimitiveArrayRegion<jboolean, JvPrimClass (boolean)>,
2750                                             // GetBooleanArrayRegion
2751   _Jv_JNI_GetPrimitiveArrayRegion<jbyte, JvPrimClass (byte)>,
2752                                             // GetByteArrayRegion
2753   _Jv_JNI_GetPrimitiveArrayRegion<jchar, JvPrimClass (char)>,
2754                                             // GetCharArrayRegion
2755   _Jv_JNI_GetPrimitiveArrayRegion<jshort, JvPrimClass (short)>,
2756                                             // GetShortArrayRegion
2757   _Jv_JNI_GetPrimitiveArrayRegion<jint, JvPrimClass (int)>,
2758                                             // GetIntArrayRegion
2759   _Jv_JNI_GetPrimitiveArrayRegion<jlong, JvPrimClass (long)>,
2760                                             // GetLongArrayRegion
2761   _Jv_JNI_GetPrimitiveArrayRegion<jfloat, JvPrimClass (float)>,
2762                                             // GetFloatArrayRegion
2763   _Jv_JNI_GetPrimitiveArrayRegion<jdouble, JvPrimClass (double)>,
2764                                             // GetDoubleArrayRegion
2765   _Jv_JNI_SetPrimitiveArrayRegion<jboolean, JvPrimClass (boolean)>,
2766                                             // SetBooleanArrayRegion
2767   _Jv_JNI_SetPrimitiveArrayRegion<jbyte, JvPrimClass (byte)>,
2768                                             // SetByteArrayRegion
2769   _Jv_JNI_SetPrimitiveArrayRegion<jchar, JvPrimClass (char)>,
2770                                             // SetCharArrayRegion
2771   _Jv_JNI_SetPrimitiveArrayRegion<jshort, JvPrimClass (short)>,
2772                                             // SetShortArrayRegion
2773   _Jv_JNI_SetPrimitiveArrayRegion<jint, JvPrimClass (int)>,
2774                                             // SetIntArrayRegion
2775   _Jv_JNI_SetPrimitiveArrayRegion<jlong, JvPrimClass (long)>,
2776                                             // SetLongArrayRegion
2777   _Jv_JNI_SetPrimitiveArrayRegion<jfloat, JvPrimClass (float)>,
2778                                             // SetFloatArrayRegion
2779   _Jv_JNI_SetPrimitiveArrayRegion<jdouble, JvPrimClass (double)>,
2780                                             // SetDoubleArrayRegion
2781   _Jv_JNI_RegisterNatives,                  // RegisterNatives
2782   _Jv_JNI_UnregisterNatives,                // UnregisterNatives
2783   _Jv_JNI_MonitorEnter,                     // MonitorEnter
2784   _Jv_JNI_MonitorExit,                      // MonitorExit
2785   _Jv_JNI_GetJavaVM,                        // GetJavaVM
2786
2787   _Jv_JNI_GetStringRegion,                  // GetStringRegion
2788   _Jv_JNI_GetStringUTFRegion,               // GetStringUTFRegion
2789   _Jv_JNI_GetPrimitiveArrayCritical,        // GetPrimitiveArrayCritical
2790   _Jv_JNI_ReleasePrimitiveArrayCritical,    // ReleasePrimitiveArrayCritical
2791   _Jv_JNI_GetStringCritical,                // GetStringCritical
2792   _Jv_JNI_ReleaseStringCritical,            // ReleaseStringCritical
2793
2794   _Jv_JNI_NewWeakGlobalRef,                 // NewWeakGlobalRef
2795   _Jv_JNI_DeleteWeakGlobalRef,              // DeleteWeakGlobalRef
2796
2797   _Jv_JNI_ExceptionCheck,                   // ExceptionCheck
2798
2799   _Jv_JNI_NewDirectByteBuffer,              // NewDirectByteBuffer
2800   _Jv_JNI_GetDirectBufferAddress,           // GetDirectBufferAddress
2801   _Jv_JNI_GetDirectBufferCapacity           // GetDirectBufferCapacity
2802 };
2803
2804 struct JNIInvokeInterface _Jv_JNI_InvokeFunctions =
2805 {
2806   RESERVED,
2807   RESERVED,
2808   RESERVED,
2809
2810   _Jv_JNI_DestroyJavaVM,
2811   _Jv_JNI_AttachCurrentThread,
2812   _Jv_JNI_DetachCurrentThread,
2813   _Jv_JNI_GetEnv,
2814   _Jv_JNI_AttachCurrentThreadAsDaemon
2815 };