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/nio/DirectByteBufferImpl$ReadWrite.h>
  46 #include <java/util/IdentityHashMap.h>
  47 #include <gnu/gcj/RawData.h>
  48
  49 #include <gcj/method.h>
  50 #include <gcj/field.h>
  51
  52 #include <java-interp.h>
  53 #include <java-threads.h>
  54
  55 using namespace gcj;
  56
  57 // This enum is used to select different template instantiations in
  58 // the invocation code.
  59 enum invocation_type
  60 {
  61   normal,
  62   nonvirtual,
  63   static_type,
  64   constructor
  65 };
  66
  67 // Forward declarations.
  68 extern struct JNINativeInterface _Jv_JNIFunctions;
  69 extern struct JNIInvokeInterface _Jv_JNI_InvokeFunctions;
  70
  71 // Number of slots in the default frame.  The VM must allow at least
  72 // 16.
  73 #define FRAME_SIZE 32
  74
  75 // Mark value indicating this is an overflow frame.
  76 #define MARK_NONE    0
  77 // Mark value indicating this is a user frame.
  78 #define MARK_USER    1
  79 // Mark value indicating this is a system frame.
  80 #define MARK_SYSTEM  2
  81
  82 // This structure is used to keep track of local references.
  83 struct _Jv_JNI_LocalFrame
  84 {
  85   // This is true if this frame object represents a pushed frame (eg
  86   // from PushLocalFrame).
  87   int marker :  2;
  88
  89   // Number of elements in frame.
  90   int size   : 30;
  91
  92   // Next frame in chain.
  93   _Jv_JNI_LocalFrame *next;
  94
  95   // The elements.  These are allocated using the C "struct hack".
  96   jobject vec[0];
  97 };
  98
  99 // This holds a reference count for all local references.
 100 static java::util::IdentityHashMap *local_ref_table;
 101 // This holds a reference count for all global references.
 102 static java::util::IdentityHashMap *global_ref_table;
 103
 104 // The only VM.
 105 static JavaVM *the_vm;
 106
 107 #ifdef ENABLE_JVMPI
 108 // The only JVMPI interface description.
 109 static JVMPI_Interface _Jv_JVMPI_Interface;
 110
 111 static jint
 112 jvmpiEnableEvent (jint event_type, void *)
 113 {
 114   switch (event_type)
 115     {
 116     case JVMPI_EVENT_OBJECT_ALLOC:
 117       _Jv_JVMPI_Notify_OBJECT_ALLOC = _Jv_JVMPI_Interface.NotifyEvent;
 118       break;
 119
 120     case JVMPI_EVENT_THREAD_START:
 121       _Jv_JVMPI_Notify_THREAD_START = _Jv_JVMPI_Interface.NotifyEvent;
 122       break;
 123
 124     case JVMPI_EVENT_THREAD_END:
 125       _Jv_JVMPI_Notify_THREAD_END = _Jv_JVMPI_Interface.NotifyEvent;
 126       break;
 127
 128     default:
 129       return JVMPI_NOT_AVAILABLE;
 130     }
 131
 132   return JVMPI_SUCCESS;
 133 }
 134
 135 static jint
 136 jvmpiDisableEvent (jint event_type, void *)
 137 {
 138   switch (event_type)
 139     {
 140     case JVMPI_EVENT_OBJECT_ALLOC:
 141       _Jv_JVMPI_Notify_OBJECT_ALLOC = NULL;
 142       break;
 143
 144     default:
 145       return JVMPI_NOT_AVAILABLE;
 146     }
 147
 148   return JVMPI_SUCCESS;
 149 }
 150 #endif
 151
 152 \f
 153
 154 void
 155 _Jv_JNI_Init (void)
 156 {
 157   local_ref_table = new java::util::IdentityHashMap;
 158   global_ref_table = new java::util::IdentityHashMap;
 159
 160 #ifdef ENABLE_JVMPI
 161   _Jv_JVMPI_Interface.version = 1;
 162   _Jv_JVMPI_Interface.EnableEvent = &jvmpiEnableEvent;
 163   _Jv_JVMPI_Interface.DisableEvent = &jvmpiDisableEvent;
 164   _Jv_JVMPI_Interface.EnableGC = &_Jv_EnableGC;
 165   _Jv_JVMPI_Interface.DisableGC = &_Jv_DisableGC;
 166   _Jv_JVMPI_Interface.RunGC = &_Jv_RunGC;
 167 #endif
 168 }
 169
 170 // Tell the GC that a certain pointer is live.
 171 static void
 172 mark_for_gc (jobject obj, java::util::IdentityHashMap *ref_table)
 173 {
 174   JvSynchronize sync (ref_table);
 175
 176   using namespace java::lang;
 177   Integer *refcount = (Integer *) ref_table->get (obj);
 178   jint val = (refcount == NULL) ? 0 : refcount->intValue ();
 179   // FIXME: what about out of memory error?
 180   ref_table->put (obj, new Integer (val + 1));
 181 }
 182
 183 // Unmark a pointer.
 184 static void
 185 unmark_for_gc (jobject obj, java::util::IdentityHashMap *ref_table)
 186 {
 187   JvSynchronize sync (ref_table);
 188
 189   using namespace java::lang;
 190   Integer *refcount = (Integer *) ref_table->get (obj);
 191   JvAssert (refcount);
 192   jint val = refcount->intValue () - 1;
 193   JvAssert (val >= 0);
 194   if (val == 0)
 195     ref_table->remove (obj);
 196   else
 197     // FIXME: what about out of memory error?
 198     ref_table->put (obj, new Integer (val));
 199 }
 200
 201 // "Unwrap" some random non-reference type.  This exists to simplify
 202 // other template functions.
 203 template<typename T>
 204 static T
 205 unwrap (T val)
 206 {
 207   return val;
 208 }
 209
 210 // Unwrap a weak reference, if required.
 211 template<typename T>
 212 static T *
 213 unwrap (T *obj)
 214 {
 215   using namespace gnu::gcj::runtime;
 216   // We can compare the class directly because JNIWeakRef is `final'.
 217   // Doing it this way is much faster.
 218   if (obj == NULL || obj->getClass () != &JNIWeakRef::class$)
 219     return obj;
 220   JNIWeakRef *wr = reinterpret_cast<JNIWeakRef *> (obj);
 221   return reinterpret_cast<T *> (wr->get ());
 222 }
 223
 224 \f
 225
 226 static jobject JNICALL
 227 _Jv_JNI_NewGlobalRef (JNIEnv *, jobject obj)
 228 {
 229   // This seems weird but I think it is correct.
 230   obj = unwrap (obj);
 231   mark_for_gc (obj, global_ref_table);
 232   return obj;
 233 }
 234
 235 static void JNICALL
 236 _Jv_JNI_DeleteGlobalRef (JNIEnv *, jobject obj)
 237 {
 238   // This seems weird but I think it is correct.
 239   obj = unwrap (obj);
 240   unmark_for_gc (obj, global_ref_table);
 241 }
 242
 243 static void JNICALL
 244 _Jv_JNI_DeleteLocalRef (JNIEnv *env, jobject obj)
 245 {
 246   _Jv_JNI_LocalFrame *frame;
 247
 248   // This seems weird but I think it is correct.
 249   obj = unwrap (obj);
 250
 251   for (frame = env->locals; frame != NULL; frame = frame->next)
 252     {
 253       for (int i = 0; i < frame->size; ++i)
 254         {
 255           if (frame->vec[i] == obj)
 256             {
 257               frame->vec[i] = NULL;
 258               unmark_for_gc (obj, local_ref_table);
 259               return;
 260             }
 261         }
 262
 263       // Don't go past a marked frame.
 264       JvAssert (frame->marker == MARK_NONE);
 265     }
 266
 267   JvAssert (0);
 268 }
 269
 270 static jint JNICALL
 271 _Jv_JNI_EnsureLocalCapacity (JNIEnv *env, jint size)
 272 {
 273   // It is easier to just always allocate a new frame of the requested
 274   // size.  This isn't the most efficient thing, but for now we don't
 275   // care.  Note that _Jv_JNI_PushLocalFrame relies on this right now.
 276
 277   _Jv_JNI_LocalFrame *frame;
 278   try
 279     {
 280       frame = (_Jv_JNI_LocalFrame *) _Jv_Malloc (sizeof (_Jv_JNI_LocalFrame)
 281                                                  + size * sizeof (jobject));
 282     }
 283   catch (jthrowable t)
 284     {
 285       env->ex = t;
 286       return JNI_ERR;
 287     }
 288
 289   frame->marker = MARK_NONE;
 290   frame->size = size;
 291   memset (&frame->vec[0], 0, size * sizeof (jobject));
 292   frame->next = env->locals;
 293   env->locals = frame;
 294
 295   return 0;
 296 }
 297
 298 static jint JNICALL
 299 _Jv_JNI_PushLocalFrame (JNIEnv *env, jint size)
 300 {
 301   jint r = _Jv_JNI_EnsureLocalCapacity (env, size);
 302   if (r < 0)
 303     return r;
 304
 305   // The new frame is on top.
 306   env->locals->marker = MARK_USER;
 307
 308   return 0;
 309 }
 310
 311 static jobject JNICALL
 312 _Jv_JNI_NewLocalRef (JNIEnv *env, jobject obj)
 313 {
 314   // This seems weird but I think it is correct.
 315   obj = unwrap (obj);
 316
 317   // Try to find an open slot somewhere in the topmost frame.
 318   _Jv_JNI_LocalFrame *frame = env->locals;
 319   bool done = false, set = false;
 320   for (; frame != NULL && ! done; frame = frame->next)
 321     {
 322       for (int i = 0; i < frame->size; ++i)
 323         {
 324           if (frame->vec[i] == NULL)
 325             {
 326               set = true;
 327               done = true;
 328               frame->vec[i] = obj;
 329               break;
 330             }
 331         }
 332
 333       // If we found a slot, or if the frame we just searched is the
 334       // mark frame, then we are done.
 335       if (done || frame == NULL || frame->marker != MARK_NONE)
 336         break;
 337     }
 338
 339   if (! set)
 340     {
 341       // No slots, so we allocate a new frame.  According to the spec
 342       // we could just die here.  FIXME: return value.
 343       _Jv_JNI_EnsureLocalCapacity (env, 16);
 344       // We know the first element of the new frame will be ok.
 345       env->locals->vec[0] = obj;
 346     }
 347
 348   mark_for_gc (obj, local_ref_table);
 349   return obj;
 350 }
 351
 352 static jobject JNICALL
 353 _Jv_JNI_PopLocalFrame (JNIEnv *env, jobject result, int stop)
 354 {
 355   _Jv_JNI_LocalFrame *rf = env->locals;
 356
 357   bool done = false;
 358   while (rf != NULL && ! done)
 359     {
 360       for (int i = 0; i < rf->size; ++i)
 361         if (rf->vec[i] != NULL)
 362           unmark_for_gc (rf->vec[i], local_ref_table);
 363
 364       // If the frame we just freed is the marker frame, we are done.
 365       done = (rf->marker == stop);
 366
 367       _Jv_JNI_LocalFrame *n = rf->next;
 368       // When N==NULL, we've reached the stack-allocated frame, and we
 369       // must not free it.  However, we must be sure to clear all its
 370       // elements, since we might conceivably reuse it.
 371       if (n == NULL)
 372         {
 373           memset (&rf->vec[0], 0, rf->size * sizeof (jobject));
 374           break;
 375         }
 376
 377       _Jv_Free (rf);
 378       rf = n;
 379     }
 380
 381   // Update the local frame information.
 382   env->locals = rf;
 383
 384   return result == NULL ? NULL : _Jv_JNI_NewLocalRef (env, result);
 385 }
 386
 387 static jobject JNICALL
 388 _Jv_JNI_PopLocalFrame (JNIEnv *env, jobject result)
 389 {
 390   return _Jv_JNI_PopLocalFrame (env, result, MARK_USER);
 391 }
 392
 393 // Make sure an array's type is compatible with the type of the
 394 // destination.
 395 template<typename T>
 396 static bool
 397 _Jv_JNI_check_types (JNIEnv *env, JArray<T> *array, jclass K)
 398 {
 399   jclass klass = array->getClass()->getComponentType();
 400   if (__builtin_expect (klass != K, false))
 401     {
 402       env->ex = new java::lang::IllegalAccessError ();
 403       return false;
 404     }
 405   else
 406     return true;
 407 }
 408
 409 // Pop a `system' frame from the stack.  This is `extern "C"' as it is
 410 // used by the compiler.
 411 extern "C" void
 412 _Jv_JNI_PopSystemFrame (JNIEnv *env)
 413 {
 414   _Jv_JNI_PopLocalFrame (env, NULL, MARK_SYSTEM);
 415
 416   if (env->ex)
 417     {
 418       jthrowable t = env->ex;
 419       env->ex = NULL;
 420       throw t;
 421     }
 422 }
 423
 424 template<typename T> T extract_from_jvalue(jvalue const & t);
 425 template<> jboolean extract_from_jvalue(jvalue const & jv) { return jv.z; }
 426 template<> jbyte    extract_from_jvalue(jvalue const & jv) { return jv.b; }
 427 template<> jchar    extract_from_jvalue(jvalue const & jv) { return jv.c; }
 428 template<> jshort   extract_from_jvalue(jvalue const & jv) { return jv.s; }
 429 template<> jint     extract_from_jvalue(jvalue const & jv) { return jv.i; }
 430 template<> jlong    extract_from_jvalue(jvalue const & jv) { return jv.j; }
 431 template<> jfloat   extract_from_jvalue(jvalue const & jv) { return jv.f; }
 432 template<> jdouble  extract_from_jvalue(jvalue const & jv) { return jv.d; }
 433 template<> jobject  extract_from_jvalue(jvalue const & jv) { return jv.l; }
 434
 435
 436 // This function is used from other template functions.  It wraps the
 437 // return value appropriately; we specialize it so that object returns
 438 // are turned into local references.
 439 template<typename T>
 440 static T
 441 wrap_value (JNIEnv *, T value)
 442 {
 443   return value;
 444 }
 445
 446 // This specialization is used for jobject, jclass, jstring, jarray,
 447 // etc.
 448 template<typename R, typename T>
 449 static T *
 450 wrap_value (JNIEnv *env, T *value)
 451 {
 452   return (value == NULL
 453           ? value
 454           : (T *) _Jv_JNI_NewLocalRef (env, (jobject) value));
 455 }
 456
 457 \f
 458
 459 static jint JNICALL
 460 _Jv_JNI_GetVersion (JNIEnv *)
 461 {
 462   return JNI_VERSION_1_4;
 463 }
 464
 465 static jclass JNICALL
 466 _Jv_JNI_DefineClass (JNIEnv *env, const char *name, jobject loader,
 467                      const jbyte *buf, jsize bufLen)
 468 {
 469   try
 470     {
 471       loader = unwrap (loader);
 472
 473       jstring sname = JvNewStringUTF (name);
 474       jbyteArray bytes = JvNewByteArray (bufLen);
 475
 476       jbyte *elts = elements (bytes);
 477       memcpy (elts, buf, bufLen * sizeof (jbyte));
 478
 479       java::lang::ClassLoader *l
 480         = reinterpret_cast<java::lang::ClassLoader *> (loader);
 481
 482       jclass result = l->defineClass (sname, bytes, 0, bufLen);
 483       return (jclass) wrap_value (env, result);
 484     }
 485   catch (jthrowable t)
 486     {
 487       env->ex = t;
 488       return NULL;
 489     }
 490 }
 491
 492 static jclass JNICALL
 493 _Jv_JNI_FindClass (JNIEnv *env, const char *name)
 494 {
 495   // FIXME: assume that NAME isn't too long.
 496   int len = strlen (name);
 497   char s[len + 1];
 498   for (int i = 0; i <= len; ++i)
 499     s[i] = (name[i] == '/') ? '.' : name[i];
 500
 501   jclass r = NULL;
 502   try
 503     {
 504       // This might throw an out of memory exception.
 505       jstring n = JvNewStringUTF (s);
 506
 507       java::lang::ClassLoader *loader = NULL;
 508       if (env->klass != NULL)
 509         loader = env->klass->getClassLoaderInternal ();
 510
 511       if (loader == NULL)
 512         {
 513           // FIXME: should use getBaseClassLoader, but we don't have that
 514           // yet.
 515           loader = java::lang::ClassLoader::getSystemClassLoader ();
 516         }
 517
 518       r = loader->loadClass (n);
 519     }
 520   catch (jthrowable t)
 521     {
 522       env->ex = t;
 523     }
 524
 525   return (jclass) wrap_value (env, r);
 526 }
 527
 528 static jclass JNICALL
 529 _Jv_JNI_GetSuperclass (JNIEnv *env, jclass clazz)
 530 {
 531   return (jclass) wrap_value (env, unwrap (clazz)->getSuperclass ());
 532 }
 533
 534 static jboolean JNICALL
 535 _Jv_JNI_IsAssignableFrom (JNIEnv *, jclass clazz1, jclass clazz2)
 536 {
 537   return unwrap (clazz1)->isAssignableFrom (unwrap (clazz2));
 538 }
 539
 540 static jint JNICALL
 541 _Jv_JNI_Throw (JNIEnv *env, jthrowable obj)
 542 {
 543   // We check in case the user did some funky cast.
 544   obj = unwrap (obj);
 545   JvAssert (obj != NULL && java::lang::Throwable::class$.isInstance (obj));
 546   env->ex = obj;
 547   return 0;
 548 }
 549
 550 static jint JNICALL
 551 _Jv_JNI_ThrowNew (JNIEnv *env, jclass clazz, const char *message)
 552 {
 553   using namespace java::lang::reflect;
 554
 555   clazz = unwrap (clazz);
 556   JvAssert (java::lang::Throwable::class$.isAssignableFrom (clazz));
 557
 558   int r = JNI_OK;
 559   try
 560     {
 561       JArray<jclass> *argtypes
 562         = (JArray<jclass> *) JvNewObjectArray (1, &java::lang::Class::class$,
 563                                                NULL);
 564
 565       jclass *elts = elements (argtypes);
 566       elts[0] = &StringClass;
 567
 568       Constructor *cons = clazz->getConstructor (argtypes);
 569
 570       jobjectArray values = JvNewObjectArray (1, &StringClass, NULL);
 571       jobject *velts = elements (values);
 572       velts[0] = JvNewStringUTF (message);
 573
 574       jobject obj = cons->newInstance (values);
 575
 576       env->ex = reinterpret_cast<jthrowable> (obj);
 577     }
 578   catch (jthrowable t)
 579     {
 580       env->ex = t;
 581       r = JNI_ERR;
 582     }
 583
 584   return r;
 585 }
 586
 587 static jthrowable JNICALL
 588 _Jv_JNI_ExceptionOccurred (JNIEnv *env)
 589 {
 590   return (jthrowable) wrap_value (env, env->ex);
 591 }
 592
 593 static void JNICALL
 594 _Jv_JNI_ExceptionDescribe (JNIEnv *env)
 595 {
 596   if (env->ex != NULL)
 597     env->ex->printStackTrace();
 598 }
 599
 600 static void JNICALL
 601 _Jv_JNI_ExceptionClear (JNIEnv *env)
 602 {
 603   env->ex = NULL;
 604 }
 605
 606 static jboolean JNICALL
 607 _Jv_JNI_ExceptionCheck (JNIEnv *env)
 608 {
 609   return env->ex != NULL;
 610 }
 611
 612 static void JNICALL
 613 _Jv_JNI_FatalError (JNIEnv *, const char *message)
 614 {
 615   JvFail (message);
 616 }
 617
 618 \f
 619
 620 static jboolean JNICALL
 621 _Jv_JNI_IsSameObject (JNIEnv *, jobject obj1, jobject obj2)
 622 {
 623   return unwrap (obj1) == unwrap (obj2);
 624 }
 625
 626 static jobject JNICALL
 627 _Jv_JNI_AllocObject (JNIEnv *env, jclass clazz)
 628 {
 629   jobject obj = NULL;
 630   using namespace java::lang::reflect;
 631
 632   try
 633     {
 634       clazz = unwrap (clazz);
 635       JvAssert (clazz && ! clazz->isArray ());
 636       if (clazz->isInterface() || Modifier::isAbstract(clazz->getModifiers()))
 637         env->ex = new java::lang::InstantiationException ();
 638       else
 639         obj = _Jv_AllocObject (clazz);
 640     }
 641   catch (jthrowable t)
 642     {
 643       env->ex = t;
 644     }
 645
 646   return wrap_value (env, obj);
 647 }
 648
 649 static jclass JNICALL
 650 _Jv_JNI_GetObjectClass (JNIEnv *env, jobject obj)
 651 {
 652   obj = unwrap (obj);
 653   JvAssert (obj);
 654   return (jclass) wrap_value (env, obj->getClass());
 655 }
 656
 657 static jboolean JNICALL
 658 _Jv_JNI_IsInstanceOf (JNIEnv *, jobject obj, jclass clazz)
 659 {
 660   return unwrap (clazz)->isInstance(unwrap (obj));
 661 }
 662
 663 \f
 664
 665 //
 666 // This section concerns method invocation.
 667 //
 668
 669 template<jboolean is_static>
 670 static jmethodID JNICALL
 671 _Jv_JNI_GetAnyMethodID (JNIEnv *env, jclass clazz,
 672                         const char *name, const char *sig)
 673 {
 674   try
 675     {
 676       clazz = unwrap (clazz);
 677       _Jv_InitClass (clazz);
 678
 679       _Jv_Utf8Const *name_u = _Jv_makeUtf8Const ((char *) name, -1);
 680
 681       // FIXME: assume that SIG isn't too long.
 682       int len = strlen (sig);
 683       char s[len + 1];
 684       for (int i = 0; i <= len; ++i)
 685         s[i] = (sig[i] == '/') ? '.' : sig[i];
 686       _Jv_Utf8Const *sig_u = _Jv_makeUtf8Const ((char *) s, -1);
 687
 688       JvAssert (! clazz->isPrimitive());
 689
 690       using namespace java::lang::reflect;
 691
 692       while (clazz != NULL)
 693         {
 694           jint count = JvNumMethods (clazz);
 695           jmethodID meth = JvGetFirstMethod (clazz);
 696
 697           for (jint i = 0; i < count; ++i)
 698             {
 699               if (((is_static && Modifier::isStatic (meth->accflags))
 700                    || (! is_static && ! Modifier::isStatic (meth->accflags)))
 701                   && _Jv_equalUtf8Consts (meth->name, name_u)
 702                   && _Jv_equalUtf8Consts (meth->signature, sig_u))
 703                 return meth;
 704
 705               meth = meth->getNextMethod();
 706             }
 707
 708           clazz = clazz->getSuperclass ();
 709         }
 710
 711       java::lang::StringBuffer *name_sig =
 712         new java::lang::StringBuffer (JvNewStringUTF (name));
 713       name_sig->append ((jchar) ' ')->append (JvNewStringUTF (s));
 714       env->ex = new java::lang::NoSuchMethodError (name_sig->toString ());
 715     }
 716   catch (jthrowable t)
 717     {
 718       env->ex = t;
 719     }
 720
 721   return NULL;
 722 }
 723
 724 // This is a helper function which turns a va_list into an array of
 725 // `jvalue's.  It needs signature information in order to do its work.
 726 // The array of values must already be allocated.
 727 static void
 728 array_from_valist (jvalue *values, JArray<jclass> *arg_types, va_list vargs)
 729 {
 730   jclass *arg_elts = elements (arg_types);
 731   for (int i = 0; i < arg_types->length; ++i)
 732     {
 733       // Here we assume that sizeof(int) >= sizeof(jint), because we
 734       // use `int' when decoding the varargs.  Likewise for
 735       // float, and double.  Also we assume that sizeof(jlong) >=
 736       // sizeof(int), i.e. that jlong values are not further
 737       // promoted.
 738       JvAssert (sizeof (int) >= sizeof (jint));
 739       JvAssert (sizeof (jlong) >= sizeof (int));
 740       JvAssert (sizeof (double) >= sizeof (jfloat));
 741       JvAssert (sizeof (double) >= sizeof (jdouble));
 742       if (arg_elts[i] == JvPrimClass (byte))
 743         values[i].b = (jbyte) va_arg (vargs, int);
 744       else if (arg_elts[i] == JvPrimClass (short))
 745         values[i].s = (jshort) va_arg (vargs, int);
 746       else if (arg_elts[i] == JvPrimClass (int))
 747         values[i].i = (jint) va_arg (vargs, int);
 748       else if (arg_elts[i] == JvPrimClass (long))
 749         values[i].j = (jlong) va_arg (vargs, jlong);
 750       else if (arg_elts[i] == JvPrimClass (float))
 751         values[i].f = (jfloat) va_arg (vargs, double);
 752       else if (arg_elts[i] == JvPrimClass (double))
 753         values[i].d = (jdouble) va_arg (vargs, double);
 754       else if (arg_elts[i] == JvPrimClass (boolean))
 755         values[i].z = (jboolean) va_arg (vargs, int);
 756       else if (arg_elts[i] == JvPrimClass (char))
 757         values[i].c = (jchar) va_arg (vargs, int);
 758       else
 759         {
 760           // An object.
 761           values[i].l = unwrap (va_arg (vargs, jobject));
 762         }
 763     }
 764 }
 765
 766 // This can call any sort of method: virtual, "nonvirtual", static, or
 767 // constructor.
 768 template<typename T, invocation_type style>
 769 static T JNICALL
 770 _Jv_JNI_CallAnyMethodV (JNIEnv *env, jobject obj, jclass klass,
 771                         jmethodID id, va_list vargs)
 772 {
 773   obj = unwrap (obj);
 774   klass = unwrap (klass);
 775
 776   jclass decl_class = klass ? klass : obj->getClass ();
 777   JvAssert (decl_class != NULL);
 778
 779   jclass return_type;
 780   JArray<jclass> *arg_types;
 781
 782   try
 783     {
 784       _Jv_GetTypesFromSignature (id, decl_class,
 785                                  &arg_types, &return_type);
 786
 787       jvalue args[arg_types->length];
 788       array_from_valist (args, arg_types, vargs);
 789
 790       // For constructors we need to pass the Class we are instantiating.
 791       if (style == constructor)
 792         return_type = klass;
 793
 794       jvalue result;
 795       _Jv_CallAnyMethodA (obj, return_type, id,
 796                           style == constructor,
 797                           style == normal,
 798                           arg_types, args, &result);
 799
 800       return wrap_value (env, extract_from_jvalue<T>(result));
 801     }
 802   catch (jthrowable t)
 803     {
 804       env->ex = t;
 805     }
 806
 807   return wrap_value (env, (T) 0);
 808 }
 809
 810 template<typename T, invocation_type style>
 811 static T JNICALL
 812 _Jv_JNI_CallAnyMethod (JNIEnv *env, jobject obj, jclass klass,
 813                        jmethodID method, ...)
 814 {
 815   va_list args;
 816   T result;
 817
 818   va_start (args, method);
 819   result = _Jv_JNI_CallAnyMethodV<T, style> (env, obj, klass, method, args);
 820   va_end (args);
 821
 822   return result;
 823 }
 824
 825 template<typename T, invocation_type style>
 826 static T JNICALL
 827 _Jv_JNI_CallAnyMethodA (JNIEnv *env, jobject obj, jclass klass,
 828                         jmethodID id, jvalue *args)
 829 {
 830   obj = unwrap (obj);
 831   klass = unwrap (klass);
 832
 833   jclass decl_class = klass ? klass : obj->getClass ();
 834   JvAssert (decl_class != NULL);
 835
 836   jclass return_type;
 837   JArray<jclass> *arg_types;
 838   try
 839     {
 840       _Jv_GetTypesFromSignature (id, decl_class,
 841                                  &arg_types, &return_type);
 842
 843       // For constructors we need to pass the Class we are instantiating.
 844       if (style == constructor)
 845         return_type = klass;
 846
 847       // Unwrap arguments as required.  Eww.
 848       jclass *type_elts = elements (arg_types);
 849       jvalue arg_copy[arg_types->length];
 850       for (int i = 0; i < arg_types->length; ++i)
 851         {
 852           if (type_elts[i]->isPrimitive ())
 853             arg_copy[i] = args[i];
 854           else
 855             arg_copy[i].l = unwrap (args[i].l);
 856         }
 857
 858       jvalue result;
 859       _Jv_CallAnyMethodA (obj, return_type, id,
 860                           style == constructor,
 861                           style == normal,
 862                           arg_types, arg_copy, &result);
 863
 864       return wrap_value (env, extract_from_jvalue<T>(result));
 865     }
 866   catch (jthrowable t)
 867     {
 868       env->ex = t;
 869     }
 870
 871   return wrap_value (env, (T) 0);
 872 }
 873
 874 template<invocation_type style>
 875 static void JNICALL
 876 _Jv_JNI_CallAnyVoidMethodV (JNIEnv *env, jobject obj, jclass klass,
 877                             jmethodID id, va_list vargs)
 878 {
 879   obj = unwrap (obj);
 880   klass = unwrap (klass);
 881
 882   jclass decl_class = klass ? klass : obj->getClass ();
 883   JvAssert (decl_class != NULL);
 884
 885   jclass return_type;
 886   JArray<jclass> *arg_types;
 887   try
 888     {
 889       _Jv_GetTypesFromSignature (id, decl_class,
 890                                  &arg_types, &return_type);
 891
 892       jvalue args[arg_types->length];
 893       array_from_valist (args, arg_types, vargs);
 894
 895       // For constructors we need to pass the Class we are instantiating.
 896       if (style == constructor)
 897         return_type = klass;
 898
 899       _Jv_CallAnyMethodA (obj, return_type, id,
 900                           style == constructor,
 901                           style == normal,
 902                           arg_types, args, NULL);
 903     }
 904   catch (jthrowable t)
 905     {
 906       env->ex = t;
 907     }
 908 }
 909
 910 template<invocation_type style>
 911 static void JNICALL
 912 _Jv_JNI_CallAnyVoidMethod (JNIEnv *env, jobject obj, jclass klass,
 913                            jmethodID method, ...)
 914 {
 915   va_list args;
 916
 917   va_start (args, method);
 918   _Jv_JNI_CallAnyVoidMethodV<style> (env, obj, klass, method, args);
 919   va_end (args);
 920 }
 921
 922 template<invocation_type style>
 923 static void JNICALL
 924 _Jv_JNI_CallAnyVoidMethodA (JNIEnv *env, jobject obj, jclass klass,
 925                             jmethodID id, jvalue *args)
 926 {
 927   jclass decl_class = klass ? klass : obj->getClass ();
 928   JvAssert (decl_class != NULL);
 929
 930   jclass return_type;
 931   JArray<jclass> *arg_types;
 932   try
 933     {
 934       _Jv_GetTypesFromSignature (id, decl_class,
 935                                  &arg_types, &return_type);
 936
 937       // Unwrap arguments as required.  Eww.
 938       jclass *type_elts = elements (arg_types);
 939       jvalue arg_copy[arg_types->length];
 940       for (int i = 0; i < arg_types->length; ++i)
 941         {
 942           if (type_elts[i]->isPrimitive ())
 943             arg_copy[i] = args[i];
 944           else
 945             arg_copy[i].l = unwrap (args[i].l);
 946         }
 947
 948       _Jv_CallAnyMethodA (obj, return_type, id,
 949                           style == constructor,
 950                           style == normal,
 951                           arg_types, args, NULL);
 952     }
 953   catch (jthrowable t)
 954     {
 955       env->ex = t;
 956     }
 957 }
 958
 959 // Functions with this signature are used to implement functions in
 960 // the CallMethod family.
 961 template<typename T>
 962 static T JNICALL
 963 _Jv_JNI_CallMethodV (JNIEnv *env, jobject obj,
 964                      jmethodID id, va_list args)
 965 {
 966   return _Jv_JNI_CallAnyMethodV<T, normal> (env, obj, NULL, id, args);
 967 }
 968
 969 // Functions with this signature are used to implement functions in
 970 // the CallMethod family.
 971 template<typename T>
 972 static T JNICALL
 973 _Jv_JNI_CallMethod (JNIEnv *env, jobject obj, jmethodID id, ...)
 974 {
 975   va_list args;
 976   T result;
 977
 978   va_start (args, id);
 979   result = _Jv_JNI_CallAnyMethodV<T, normal> (env, obj, NULL, id, args);
 980   va_end (args);
 981
 982   return result;
 983 }
 984
 985 // Functions with this signature are used to implement functions in
 986 // the CallMethod family.
 987 template<typename T>
 988 static T JNICALL
 989 _Jv_JNI_CallMethodA (JNIEnv *env, jobject obj,
 990                      jmethodID id, jvalue *args)
 991 {
 992   return _Jv_JNI_CallAnyMethodA<T, normal> (env, obj, NULL, id, args);
 993 }
 994
 995 static void JNICALL
 996 _Jv_JNI_CallVoidMethodV (JNIEnv *env, jobject obj,
 997                          jmethodID id, va_list args)
 998 {
 999   _Jv_JNI_CallAnyVoidMethodV<normal> (env, obj, NULL, id, args);
1000 }
1001
1002 static void JNICALL
1003 _Jv_JNI_CallVoidMethod (JNIEnv *env, jobject obj, jmethodID id, ...)
1004 {
1005   va_list args;
1006
1007   va_start (args, id);
1008   _Jv_JNI_CallAnyVoidMethodV<normal> (env, obj, NULL, id, args);
1009   va_end (args);
1010 }
1011
1012 static void JNICALL
1013 _Jv_JNI_CallVoidMethodA (JNIEnv *env, jobject obj,
1014                          jmethodID id, jvalue *args)
1015 {
1016   _Jv_JNI_CallAnyVoidMethodA<normal> (env, obj, NULL, id, args);
1017 }
1018
1019 // Functions with this signature are used to implement functions in
1020 // the CallStaticMethod family.
1021 template<typename T>
1022 static T JNICALL
1023 _Jv_JNI_CallStaticMethodV (JNIEnv *env, jclass klass,
1024                            jmethodID id, va_list args)
1025 {
1026   JvAssert (((id->accflags) & java::lang::reflect::Modifier::STATIC));
1027   JvAssert (java::lang::Class::class$.isInstance (unwrap (klass)));
1028
1029   return _Jv_JNI_CallAnyMethodV<T, static_type> (env, NULL, klass, id, args);
1030 }
1031
1032 // Functions with this signature are used to implement functions in
1033 // the CallStaticMethod family.
1034 template<typename T>
1035 static T JNICALL
1036 _Jv_JNI_CallStaticMethod (JNIEnv *env, jclass klass,
1037                           jmethodID id, ...)
1038 {
1039   va_list args;
1040   T result;
1041
1042   JvAssert (((id->accflags) & java::lang::reflect::Modifier::STATIC));
1043   JvAssert (java::lang::Class::class$.isInstance (unwrap (klass)));
1044
1045   va_start (args, id);
1046   result = _Jv_JNI_CallAnyMethodV<T, static_type> (env, NULL, klass,
1047                                                    id, args);
1048   va_end (args);
1049
1050   return result;
1051 }
1052
1053 // Functions with this signature are used to implement functions in
1054 // the CallStaticMethod family.
1055 template<typename T>
1056 static T JNICALL
1057 _Jv_JNI_CallStaticMethodA (JNIEnv *env, jclass klass, jmethodID id,
1058                            jvalue *args)
1059 {
1060   JvAssert (((id->accflags) & java::lang::reflect::Modifier::STATIC));
1061   JvAssert (java::lang::Class::class$.isInstance (unwrap (klass)));
1062
1063   return _Jv_JNI_CallAnyMethodA<T, static_type> (env, NULL, klass, id, args);
1064 }
1065
1066 static void JNICALL
1067 _Jv_JNI_CallStaticVoidMethodV (JNIEnv *env, jclass klass,
1068                                jmethodID id, va_list args)
1069 {
1070   _Jv_JNI_CallAnyVoidMethodV<static_type> (env, NULL, klass, id, args);
1071 }
1072
1073 static void JNICALL
1074 _Jv_JNI_CallStaticVoidMethod (JNIEnv *env, jclass klass,
1075                               jmethodID id, ...)
1076 {
1077   va_list args;
1078
1079   va_start (args, id);
1080   _Jv_JNI_CallAnyVoidMethodV<static_type> (env, NULL, klass, id, args);
1081   va_end (args);
1082 }
1083
1084 static void JNICALL
1085 _Jv_JNI_CallStaticVoidMethodA (JNIEnv *env, jclass klass,
1086                                jmethodID id, jvalue *args)
1087 {
1088   _Jv_JNI_CallAnyVoidMethodA<static_type> (env, NULL, klass, id, args);
1089 }
1090
1091 static jobject JNICALL
1092 _Jv_JNI_NewObjectV (JNIEnv *env, jclass klass,
1093                     jmethodID id, va_list args)
1094 {
1095   JvAssert (klass && ! klass->isArray ());
1096   JvAssert (! strcmp (id->name->data, "<init>")
1097             && id->signature->length > 2
1098             && id->signature->data[0] == '('
1099             && ! strcmp (&id->signature->data[id->signature->length - 2],
1100                          ")V"));
1101
1102   return _Jv_JNI_CallAnyMethodV<jobject, constructor> (env, NULL, klass,
1103                                                        id, args);
1104 }
1105
1106 static jobject JNICALL
1107 _Jv_JNI_NewObject (JNIEnv *env, jclass klass, jmethodID id, ...)
1108 {
1109   JvAssert (klass && ! klass->isArray ());
1110   JvAssert (! strcmp (id->name->data, "<init>")
1111             && id->signature->length > 2
1112             && id->signature->data[0] == '('
1113             && ! strcmp (&id->signature->data[id->signature->length - 2],
1114                          ")V"));
1115
1116   va_list args;
1117   jobject result;
1118
1119   va_start (args, id);
1120   result = _Jv_JNI_CallAnyMethodV<jobject, constructor> (env, NULL, klass,
1121                                                          id, args);
1122   va_end (args);
1123
1124   return result;
1125 }
1126
1127 static jobject JNICALL
1128 _Jv_JNI_NewObjectA (JNIEnv *env, jclass klass, jmethodID id,
1129                     jvalue *args)
1130 {
1131   JvAssert (klass && ! klass->isArray ());
1132   JvAssert (! strcmp (id->name->data, "<init>")
1133             && id->signature->length > 2
1134             && id->signature->data[0] == '('
1135             && ! strcmp (&id->signature->data[id->signature->length - 2],
1136                          ")V"));
1137
1138   return _Jv_JNI_CallAnyMethodA<jobject, constructor> (env, NULL, klass,
1139                                                        id, args);
1140 }
1141
1142 \f
1143
1144 template<typename T>
1145 static T JNICALL
1146 _Jv_JNI_GetField (JNIEnv *env, jobject obj, jfieldID field)
1147 {
1148   obj = unwrap (obj);
1149   JvAssert (obj);
1150   T *ptr = (T *) ((char *) obj + field->getOffset ());
1151   return wrap_value (env, *ptr);
1152 }
1153
1154 template<typename T>
1155 static void JNICALL
1156 _Jv_JNI_SetField (JNIEnv *, jobject obj, jfieldID field, T value)
1157 {
1158   obj = unwrap (obj);
1159   value = unwrap (value);
1160
1161   JvAssert (obj);
1162   T *ptr = (T *) ((char *) obj + field->getOffset ());
1163   *ptr = value;
1164 }
1165
1166 template<jboolean is_static>
1167 static jfieldID JNICALL
1168 _Jv_JNI_GetAnyFieldID (JNIEnv *env, jclass clazz,
1169                        const char *name, const char *sig)
1170 {
1171   try
1172     {
1173       clazz = unwrap (clazz);
1174
1175       _Jv_InitClass (clazz);
1176
1177       _Jv_Utf8Const *a_name = _Jv_makeUtf8Const ((char *) name, -1);
1178
1179       // FIXME: assume that SIG isn't too long.
1180       int len = strlen (sig);
1181       char s[len + 1];
1182       for (int i = 0; i <= len; ++i)
1183         s[i] = (sig[i] == '/') ? '.' : sig[i];
1184       jclass field_class = _Jv_FindClassFromSignature ((char *) s, NULL);
1185
1186       // FIXME: what if field_class == NULL?
1187
1188       java::lang::ClassLoader *loader = clazz->getClassLoaderInternal ();
1189       while (clazz != NULL)
1190         {
1191           // We acquire the class lock so that fields aren't resolved
1192           // while we are running.
1193           JvSynchronize sync (clazz);
1194
1195           jint count = (is_static
1196                         ? JvNumStaticFields (clazz)
1197                         : JvNumInstanceFields (clazz));
1198           jfieldID field = (is_static
1199                             ? JvGetFirstStaticField (clazz)
1200                             : JvGetFirstInstanceField (clazz));
1201           for (jint i = 0; i < count; ++i)
1202             {
1203               _Jv_Utf8Const *f_name = field->getNameUtf8Const(clazz);
1204
1205               // The field might be resolved or it might not be.  It
1206               // is much simpler to always resolve it.
1207               _Jv_ResolveField (field, loader);
1208               if (_Jv_equalUtf8Consts (f_name, a_name)
1209                   && field->getClass() == field_class)
1210                 return field;
1211
1212               field = field->getNextField ();
1213             }
1214
1215           clazz = clazz->getSuperclass ();
1216         }
1217
1218       env->ex = new java::lang::NoSuchFieldError ();
1219     }
1220   catch (jthrowable t)
1221     {
1222       env->ex = t;
1223     }
1224   return NULL;
1225 }
1226
1227 template<typename T>
1228 static T JNICALL
1229 _Jv_JNI_GetStaticField (JNIEnv *env, jclass, jfieldID field)
1230 {
1231   T *ptr = (T *) field->u.addr;
1232   return wrap_value (env, *ptr);
1233 }
1234
1235 template<typename T>
1236 static void JNICALL
1237 _Jv_JNI_SetStaticField (JNIEnv *, jclass, jfieldID field, T value)
1238 {
1239   value = unwrap (value);
1240   T *ptr = (T *) field->u.addr;
1241   *ptr = value;
1242 }
1243
1244 static jstring JNICALL
1245 _Jv_JNI_NewString (JNIEnv *env, const jchar *unichars, jsize len)
1246 {
1247   try
1248     {
1249       jstring r = _Jv_NewString (unichars, len);
1250       return (jstring) wrap_value (env, r);
1251     }
1252   catch (jthrowable t)
1253     {
1254       env->ex = t;
1255       return NULL;
1256     }
1257 }
1258
1259 static jsize JNICALL
1260 _Jv_JNI_GetStringLength (JNIEnv *, jstring string)
1261 {
1262   return unwrap (string)->length();
1263 }
1264
1265 static const jchar * JNICALL
1266 _Jv_JNI_GetStringChars (JNIEnv *, jstring string, jboolean *isCopy)
1267 {
1268   string = unwrap (string);
1269   jchar *result = _Jv_GetStringChars (string);
1270   mark_for_gc (string, global_ref_table);
1271   if (isCopy)
1272     *isCopy = false;
1273   return (const jchar *) result;
1274 }
1275
1276 static void JNICALL
1277 _Jv_JNI_ReleaseStringChars (JNIEnv *, jstring string, const jchar *)
1278 {
1279   unmark_for_gc (unwrap (string), global_ref_table);
1280 }
1281
1282 static jstring JNICALL
1283 _Jv_JNI_NewStringUTF (JNIEnv *env, const char *bytes)
1284 {
1285   try
1286     {
1287       jstring result = JvNewStringUTF (bytes);
1288       return (jstring) wrap_value (env, result);
1289     }
1290   catch (jthrowable t)
1291     {
1292       env->ex = t;
1293       return NULL;
1294     }
1295 }
1296
1297 static jsize JNICALL
1298 _Jv_JNI_GetStringUTFLength (JNIEnv *, jstring string)
1299 {
1300   return JvGetStringUTFLength (unwrap (string));
1301 }
1302
1303 static const char * JNICALL
1304 _Jv_JNI_GetStringUTFChars (JNIEnv *env, jstring string,
1305                            jboolean *isCopy)
1306 {
1307   try
1308     {
1309       string = unwrap (string);
1310       if (string == NULL)
1311         return NULL;
1312       jsize len = JvGetStringUTFLength (string);
1313       char *r = (char *) _Jv_Malloc (len + 1);
1314       JvGetStringUTFRegion (string, 0, string->length(), r);
1315       r[len] = '\0';
1316
1317       if (isCopy)
1318         *isCopy = true;
1319
1320       return (const char *) r;
1321     }
1322   catch (jthrowable t)
1323     {
1324       env->ex = t;
1325       return NULL;
1326     }
1327 }
1328
1329 static void JNICALL
1330 _Jv_JNI_ReleaseStringUTFChars (JNIEnv *, jstring, const char *utf)
1331 {
1332   _Jv_Free ((void *) utf);
1333 }
1334
1335 static void JNICALL
1336 _Jv_JNI_GetStringRegion (JNIEnv *env, jstring string, jsize start,
1337                          jsize len, jchar *buf)
1338 {
1339   string = unwrap (string);
1340   jchar *result = _Jv_GetStringChars (string);
1341   if (start < 0 || start > string->length ()
1342       || len < 0 || start + len > string->length ())
1343     {
1344       try
1345         {
1346           env->ex = new java::lang::StringIndexOutOfBoundsException ();
1347         }
1348       catch (jthrowable t)
1349         {
1350           env->ex = t;
1351         }
1352     }
1353   else
1354     memcpy (buf, &result[start], len * sizeof (jchar));
1355 }
1356
1357 static void JNICALL
1358 _Jv_JNI_GetStringUTFRegion (JNIEnv *env, jstring str, jsize start,
1359                             jsize len, char *buf)
1360 {
1361   str = unwrap (str);
1362
1363   if (start < 0 || start > str->length ()
1364       || len < 0 || start + len > str->length ())
1365     {
1366       try
1367         {
1368           env->ex = new java::lang::StringIndexOutOfBoundsException ();
1369         }
1370       catch (jthrowable t)
1371         {
1372           env->ex = t;
1373         }
1374     }
1375   else
1376     _Jv_GetStringUTFRegion (str, start, len, buf);
1377 }
1378
1379 static const jchar * JNICALL
1380 _Jv_JNI_GetStringCritical (JNIEnv *, jstring str, jboolean *isCopy)
1381 {
1382   jchar *result = _Jv_GetStringChars (unwrap (str));
1383   if (isCopy)
1384     *isCopy = false;
1385   return result;
1386 }
1387
1388 static void JNICALL
1389 _Jv_JNI_ReleaseStringCritical (JNIEnv *, jstring, const jchar *)
1390 {
1391   // Nothing.
1392 }
1393
1394 static jsize JNICALL
1395 _Jv_JNI_GetArrayLength (JNIEnv *, jarray array)
1396 {
1397   return unwrap (array)->length;
1398 }
1399
1400 static jobjectArray JNICALL
1401 _Jv_JNI_NewObjectArray (JNIEnv *env, jsize length,
1402                         jclass elementClass, jobject init)
1403 {
1404   try
1405     {
1406       elementClass = unwrap (elementClass);
1407       init = unwrap (init);
1408
1409       _Jv_CheckCast (elementClass, init);
1410       jarray result = JvNewObjectArray (length, elementClass, init);
1411       return (jobjectArray) wrap_value (env, result);
1412     }
1413   catch (jthrowable t)
1414     {
1415       env->ex = t;
1416       return NULL;
1417     }
1418 }
1419
1420 static jobject JNICALL
1421 _Jv_JNI_GetObjectArrayElement (JNIEnv *env, jobjectArray array,
1422                                jsize index)
1423 {
1424   if ((unsigned) index >= (unsigned) array->length)
1425     _Jv_ThrowBadArrayIndex (index);
1426   jobject *elts = elements (unwrap (array));
1427   return wrap_value (env, elts[index]);
1428 }
1429
1430 static void JNICALL
1431 _Jv_JNI_SetObjectArrayElement (JNIEnv *env, jobjectArray array,
1432                                jsize index, jobject value)
1433 {
1434   try
1435     {
1436       array = unwrap (array);
1437       value = unwrap (value);
1438
1439       _Jv_CheckArrayStore (array, value);
1440       if ((unsigned) index >= (unsigned) array->length)
1441         _Jv_ThrowBadArrayIndex (index);
1442       jobject *elts = elements (array);
1443       elts[index] = value;
1444     }
1445   catch (jthrowable t)
1446     {
1447       env->ex = t;
1448     }
1449 }
1450
1451 template<typename T, jclass K>
1452 static JArray<T> * JNICALL
1453 _Jv_JNI_NewPrimitiveArray (JNIEnv *env, jsize length)
1454 {
1455   try
1456     {
1457       return (JArray<T> *) wrap_value (env, _Jv_NewPrimArray (K, length));
1458     }
1459   catch (jthrowable t)
1460     {
1461       env->ex = t;
1462       return NULL;
1463     }
1464 }
1465
1466 template<typename T, jclass K>
1467 static T * JNICALL
1468 _Jv_JNI_GetPrimitiveArrayElements (JNIEnv *env, JArray<T> *array,
1469                                    jboolean *isCopy)
1470 {
1471   array = unwrap (array);
1472   if (! _Jv_JNI_check_types (env, array, K))
1473     return NULL;
1474   T *elts = elements (array);
1475   if (isCopy)
1476     {
1477       // We elect never to copy.
1478       *isCopy = false;
1479     }
1480   mark_for_gc (array, global_ref_table);
1481   return elts;
1482 }
1483
1484 template<typename T, jclass K>
1485 static void JNICALL
1486 _Jv_JNI_ReleasePrimitiveArrayElements (JNIEnv *env, JArray<T> *array,
1487                                        T *, jint /* mode */)
1488 {
1489   array = unwrap (array);
1490   _Jv_JNI_check_types (env, array, K);
1491   // Note that we ignore MODE.  We can do this because we never copy
1492   // the array elements.  My reading of the JNI documentation is that
1493   // this is an option for the implementor.
1494   unmark_for_gc (array, global_ref_table);
1495 }
1496
1497 template<typename T, jclass K>
1498 static void JNICALL
1499 _Jv_JNI_GetPrimitiveArrayRegion (JNIEnv *env, JArray<T> *array,
1500                                  jsize start, jsize len,
1501                                  T *buf)
1502 {
1503   array = unwrap (array);
1504   if (! _Jv_JNI_check_types (env, array, K))
1505     return;
1506
1507   // The cast to unsigned lets us save a comparison.
1508   if (start < 0 || len < 0
1509       || (unsigned long) (start + len) > (unsigned long) array->length)
1510     {
1511       try
1512         {
1513           // FIXME: index.
1514           env->ex = new java::lang::ArrayIndexOutOfBoundsException ();
1515         }
1516       catch (jthrowable t)
1517         {
1518           // Could have thown out of memory error.
1519           env->ex = t;
1520         }
1521     }
1522   else
1523     {
1524       T *elts = elements (array) + start;
1525       memcpy (buf, elts, len * sizeof (T));
1526     }
1527 }
1528
1529 template<typename T, jclass K>
1530 static void JNICALL
1531 _Jv_JNI_SetPrimitiveArrayRegion (JNIEnv *env, JArray<T> *array,
1532                                  jsize start, jsize len, T *buf)
1533 {
1534   array = unwrap (array);
1535   if (! _Jv_JNI_check_types (env, array, K))
1536     return;
1537
1538   // The cast to unsigned lets us save a comparison.
1539   if (start < 0 || len < 0
1540       || (unsigned long) (start + len) > (unsigned long) array->length)
1541     {
1542       try
1543         {
1544           // FIXME: index.
1545           env->ex = new java::lang::ArrayIndexOutOfBoundsException ();
1546         }
1547       catch (jthrowable t)
1548         {
1549           env->ex = t;
1550         }
1551     }
1552   else
1553     {
1554       T *elts = elements (array) + start;
1555       memcpy (elts, buf, len * sizeof (T));
1556     }
1557 }
1558
1559 static void * JNICALL
1560 _Jv_JNI_GetPrimitiveArrayCritical (JNIEnv *, jarray array,
1561                                    jboolean *isCopy)
1562 {
1563   array = unwrap (array);
1564   // FIXME: does this work?
1565   jclass klass = array->getClass()->getComponentType();
1566   JvAssert (klass->isPrimitive ());
1567   char *r = _Jv_GetArrayElementFromElementType (array, klass);
1568   if (isCopy)
1569     *isCopy = false;
1570   return r;
1571 }
1572
1573 static void JNICALL
1574 _Jv_JNI_ReleasePrimitiveArrayCritical (JNIEnv *, jarray, void *, jint)
1575 {
1576   // Nothing.
1577 }
1578
1579 static jint JNICALL
1580 _Jv_JNI_MonitorEnter (JNIEnv *env, jobject obj)
1581 {
1582   try
1583     {
1584       _Jv_MonitorEnter (unwrap (obj));
1585       return 0;
1586     }
1587   catch (jthrowable t)
1588     {
1589       env->ex = t;
1590     }
1591   return JNI_ERR;
1592 }
1593
1594 static jint JNICALL
1595 _Jv_JNI_MonitorExit (JNIEnv *env, jobject obj)
1596 {
1597   try
1598     {
1599       _Jv_MonitorExit (unwrap (obj));
1600       return 0;
1601     }
1602   catch (jthrowable t)
1603     {
1604       env->ex = t;
1605     }
1606   return JNI_ERR;
1607 }
1608
1609 // JDK 1.2
1610 jobject JNICALL
1611 _Jv_JNI_ToReflectedField (JNIEnv *env, jclass cls, jfieldID fieldID,
1612                           jboolean)
1613 {
1614   try
1615     {
1616       cls = unwrap (cls);
1617       java::lang::reflect::Field *field = new java::lang::reflect::Field();
1618       field->declaringClass = cls;
1619       field->offset = (char*) fieldID - (char *) cls->fields;
1620       field->name = _Jv_NewStringUtf8Const (fieldID->getNameUtf8Const (cls));
1621       return wrap_value (env, field);
1622     }
1623   catch (jthrowable t)
1624     {
1625       env->ex = t;
1626     }
1627   return NULL;
1628 }
1629
1630 // JDK 1.2
1631 static jfieldID JNICALL
1632 _Jv_JNI_FromReflectedField (JNIEnv *, jobject f)
1633 {
1634   using namespace java::lang::reflect;
1635
1636   f = unwrap (f);
1637   Field *field = reinterpret_cast<Field *> (f);
1638   return _Jv_FromReflectedField (field);
1639 }
1640
1641 jobject JNICALL
1642 _Jv_JNI_ToReflectedMethod (JNIEnv *env, jclass klass, jmethodID id,
1643                            jboolean)
1644 {
1645   using namespace java::lang::reflect;
1646
1647   jobject result = NULL;
1648   klass = unwrap (klass);
1649
1650   try
1651     {
1652       if (_Jv_equalUtf8Consts (id->name, init_name))
1653         {
1654           // A constructor.
1655           Constructor *cons = new Constructor ();
1656           cons->offset = (char *) id - (char *) &klass->methods;
1657           cons->declaringClass = klass;
1658           result = cons;
1659         }
1660       else
1661         {
1662           Method *meth = new Method ();
1663           meth->offset = (char *) id - (char *) &klass->methods;
1664           meth->declaringClass = klass;
1665           result = meth;
1666         }
1667     }
1668   catch (jthrowable t)
1669     {
1670       env->ex = t;
1671     }
1672
1673   return wrap_value (env, result);
1674 }
1675
1676 static jmethodID JNICALL
1677 _Jv_JNI_FromReflectedMethod (JNIEnv *, jobject method)
1678 {
1679   using namespace java::lang::reflect;
1680   method = unwrap (method);
1681   if (Method::class$.isInstance (method))
1682     return _Jv_FromReflectedMethod (reinterpret_cast<Method *> (method));
1683   return
1684     _Jv_FromReflectedConstructor (reinterpret_cast<Constructor *> (method));
1685 }
1686
1687 // JDK 1.2.
1688 jweak JNICALL
1689 _Jv_JNI_NewWeakGlobalRef (JNIEnv *env, jobject obj)
1690 {
1691   using namespace gnu::gcj::runtime;
1692   JNIWeakRef *ref = NULL;
1693
1694   try
1695     {
1696       // This seems weird but I think it is correct.
1697       obj = unwrap (obj);
1698       ref = new JNIWeakRef (obj);
1699       mark_for_gc (ref, global_ref_table);
1700     }
1701   catch (jthrowable t)
1702     {
1703       env->ex = t;
1704     }
1705
1706   return reinterpret_cast<jweak> (ref);
1707 }
1708
1709 void JNICALL
1710 _Jv_JNI_DeleteWeakGlobalRef (JNIEnv *, jweak obj)
1711 {
1712   using namespace gnu::gcj::runtime;
1713   JNIWeakRef *ref = reinterpret_cast<JNIWeakRef *> (obj);
1714   unmark_for_gc (ref, global_ref_table);
1715   ref->clear ();
1716 }
1717
1718 \f
1719
1720 // Direct byte buffers.
1721
1722 static jobject JNICALL
1723 _Jv_JNI_NewDirectByteBuffer (JNIEnv *, void *address, jlong length)
1724 {
1725   using namespace gnu::gcj;
1726   using namespace java::nio;
1727   return new DirectByteBufferImpl$ReadWrite
1728     (reinterpret_cast<RawData *> (address), length);
1729 }
1730
1731 static void * JNICALL
1732 _Jv_JNI_GetDirectBufferAddress (JNIEnv *, jobject buffer)
1733 {
1734   using namespace java::nio;
1735   DirectByteBufferImpl* bb = static_cast<DirectByteBufferImpl *> (buffer);
1736   return reinterpret_cast<void *> (bb->address);
1737 }
1738
1739 static jlong JNICALL
1740 _Jv_JNI_GetDirectBufferCapacity (JNIEnv *, jobject buffer)
1741 {
1742   using namespace java::nio;
1743   DirectByteBufferImpl* bb = static_cast<DirectByteBufferImpl *> (buffer);
1744   return bb->capacity();
1745 }
1746
1747 \f
1748
1749 // Hash table of native methods.
1750 static JNINativeMethod *nathash;
1751 // Number of slots used.
1752 static int nathash_count = 0;
1753 // Number of slots available.  Must be power of 2.
1754 static int nathash_size = 0;
1755
1756 #define DELETED_ENTRY ((char *) (~0))
1757
1758 // Compute a hash value for a native method descriptor.
1759 static int
1760 hash (const JNINativeMethod *method)
1761 {
1762   char *ptr;
1763   int hash = 0;
1764
1765   ptr = method->name;
1766   while (*ptr)
1767     hash = (31 * hash) + *ptr++;
1768
1769   ptr = method->signature;
1770   while (*ptr)
1771     hash = (31 * hash) + *ptr++;
1772
1773   return hash;
1774 }
1775
1776 // Find the slot where a native method goes.
1777 static JNINativeMethod *
1778 nathash_find_slot (const JNINativeMethod *method)
1779 {
1780   jint h = hash (method);
1781   int step = (h ^ (h >> 16)) | 1;
1782   int w = h & (nathash_size - 1);
1783   int del = -1;
1784
1785   for (;;)
1786     {
1787       JNINativeMethod *slotp = &nathash[w];
1788       if (slotp->name == NULL)
1789         {
1790           if (del >= 0)
1791             return &nathash[del];
1792           else
1793             return slotp;
1794         }
1795       else if (slotp->name == DELETED_ENTRY)
1796         del = w;
1797       else if (! strcmp (slotp->name, method->name)
1798                && ! strcmp (slotp->signature, method->signature))
1799         return slotp;
1800       w = (w + step) & (nathash_size - 1);
1801     }
1802 }
1803
1804 // Find a method.  Return NULL if it isn't in the hash table.
1805 static void *
1806 nathash_find (JNINativeMethod *method)
1807 {
1808   if (nathash == NULL)
1809     return NULL;
1810   JNINativeMethod *slot = nathash_find_slot (method);
1811   if (slot->name == NULL || slot->name == DELETED_ENTRY)
1812     return NULL;
1813   return slot->fnPtr;
1814 }
1815
1816 static void
1817 natrehash ()
1818 {
1819   if (nathash == NULL)
1820     {
1821       nathash_size = 1024;
1822       nathash =
1823         (JNINativeMethod *) _Jv_AllocBytes (nathash_size
1824                                             * sizeof (JNINativeMethod));
1825       memset (nathash, 0, nathash_size * sizeof (JNINativeMethod));
1826     }
1827   else
1828     {
1829       int savesize = nathash_size;
1830       JNINativeMethod *savehash = nathash;
1831       nathash_size *= 2;
1832       nathash =
1833         (JNINativeMethod *) _Jv_AllocBytes (nathash_size
1834                                             * sizeof (JNINativeMethod));
1835       memset (nathash, 0, nathash_size * sizeof (JNINativeMethod));
1836
1837       for (int i = 0; i < savesize; ++i)
1838         {
1839           if (savehash[i].name != NULL && savehash[i].name != DELETED_ENTRY)
1840             {
1841               JNINativeMethod *slot = nathash_find_slot (&savehash[i]);
1842               *slot = savehash[i];
1843             }
1844         }
1845     }
1846 }
1847
1848 static void
1849 nathash_add (const JNINativeMethod *method)
1850 {
1851   if (3 * nathash_count >= 2 * nathash_size)
1852     natrehash ();
1853   JNINativeMethod *slot = nathash_find_slot (method);
1854   // If the slot has a real entry in it, then there is no work to do.
1855   if (slot->name != NULL && slot->name != DELETED_ENTRY)
1856     return;
1857   // FIXME
1858   slot->name = strdup (method->name);
1859   slot->signature = strdup (method->signature);
1860   slot->fnPtr = method->fnPtr;
1861 }
1862
1863 static jint JNICALL
1864 _Jv_JNI_RegisterNatives (JNIEnv *env, jclass klass,
1865                          const JNINativeMethod *methods,
1866                          jint nMethods)
1867 {
1868   // Synchronize while we do the work.  This must match
1869   // synchronization in some other functions that manipulate or use
1870   // the nathash table.
1871   JvSynchronize sync (global_ref_table);
1872
1873   // Look at each descriptor given us, and find the corresponding
1874   // method in the class.
1875   for (int j = 0; j < nMethods; ++j)
1876     {
1877       bool found = false;
1878
1879       _Jv_Method *imeths = JvGetFirstMethod (klass);
1880       for (int i = 0; i < JvNumMethods (klass); ++i)
1881         {
1882           _Jv_Method *self = &imeths[i];
1883
1884           if (! strcmp (self->name->chars (), methods[j].name)
1885               && ! strcmp (self->signature->chars (), methods[j].signature))
1886             {
1887               if (! (self->accflags & java::lang::reflect::Modifier::NATIVE))
1888                 break;
1889
1890               // Found a match that is native.
1891               found = true;
1892               nathash_add (&methods[j]);
1893
1894               break;
1895             }
1896         }
1897
1898       if (! found)
1899         {
1900           jstring m = JvNewStringUTF (methods[j].name);
1901           try
1902             {
1903               env->ex = new java::lang::NoSuchMethodError (m);
1904             }
1905           catch (jthrowable t)
1906             {
1907               env->ex = t;
1908             }
1909           return JNI_ERR;
1910         }
1911     }
1912
1913   return JNI_OK;
1914 }
1915
1916 static jint JNICALL
1917 _Jv_JNI_UnregisterNatives (JNIEnv *, jclass)
1918 {
1919   // FIXME -- we could implement this.
1920   return JNI_ERR;
1921 }
1922
1923 \f
1924
1925 // Add a character to the buffer, encoding properly.
1926 static void
1927 add_char (char *buf, jchar c, int *here)
1928 {
1929   if (c == '_')
1930     {
1931       buf[(*here)++] = '_';
1932       buf[(*here)++] = '1';
1933     }
1934   else if (c == ';')
1935     {
1936       buf[(*here)++] = '_';
1937       buf[(*here)++] = '2';
1938     }
1939   else if (c == '[')
1940     {
1941       buf[(*here)++] = '_';
1942       buf[(*here)++] = '3';
1943     }
1944
1945   // Also check for `.' here because we might be passed an internal
1946   // qualified class name like `foo.bar'.
1947   else if (c == '/' || c == '.')
1948     buf[(*here)++] = '_';
1949   else if ((c >= '0' && c <= '9')
1950            || (c >= 'a' && c <= 'z')
1951            || (c >= 'A' && c <= 'Z'))
1952     buf[(*here)++] = (char) c;
1953   else
1954     {
1955       // "Unicode" character.
1956       buf[(*here)++] = '_';
1957       buf[(*here)++] = '0';
1958       for (int i = 0; i < 4; ++i)
1959         {
1960           int val = c & 0x0f;
1961           buf[(*here) + 3 - i] = (val > 10) ? ('a' + val - 10) : ('0' + val);
1962           c >>= 4;
1963         }
1964       *here += 4;
1965     }
1966 }
1967
1968 // Compute a mangled name for a native function.  This computes the
1969 // long name, and also returns an index which indicates where a NUL
1970 // can be placed to create the short name.  This function assumes that
1971 // the buffer is large enough for its results.
1972 static void
1973 mangled_name (jclass klass, _Jv_Utf8Const *func_name,
1974               _Jv_Utf8Const *signature, char *buf, int *long_start)
1975 {
1976   strcpy (buf, "Java_");
1977   int here = 5;
1978
1979   // Add fully qualified class name.
1980   jchar *chars = _Jv_GetStringChars (klass->getName ());
1981   jint len = klass->getName ()->length ();
1982   for (int i = 0; i < len; ++i)
1983     add_char (buf, chars[i], &here);
1984
1985   // Don't use add_char because we need a literal `_'.
1986   buf[here++] = '_';
1987
1988   const unsigned char *fn = (const unsigned char *) func_name->chars ();
1989   const unsigned char *limit = fn + func_name->len ();
1990   for (int i = 0; ; ++i)
1991     {
1992       int ch = UTF8_GET (fn, limit);
1993       if (ch < 0)
1994         break;
1995       add_char (buf, ch, &here);
1996     }
1997
1998   // This is where the long signature begins.
1999   *long_start = here;
2000   buf[here++] = '_';
2001   buf[here++] = '_';
2002
2003   const unsigned char *sig = (const unsigned char *) signature->chars ();
2004   limit = sig + signature->len ();
2005   JvAssert (sig[0] == '(');
2006   ++sig;
2007   while (1)
2008     {
2009       int ch = UTF8_GET (sig, limit);
2010       if (ch == ')' || ch < 0)
2011         break;
2012       add_char (buf, ch, &here);
2013     }
2014
2015   buf[here] = '\0';
2016 }
2017
2018 // Return the current thread's JNIEnv; if one does not exist, create
2019 // it.  Also create a new system frame for use.  This is `extern "C"'
2020 // because the compiler calls it.
2021 extern "C" JNIEnv *
2022 _Jv_GetJNIEnvNewFrame (jclass klass)
2023 {
2024   JNIEnv *env = _Jv_GetCurrentJNIEnv ();
2025   if (env == NULL)
2026     {
2027       env = (JNIEnv *) _Jv_MallocUnchecked (sizeof (JNIEnv));
2028       env->p = &_Jv_JNIFunctions;
2029       env->klass = klass;
2030       env->locals = NULL;
2031       // We set env->ex below.
2032
2033       _Jv_SetCurrentJNIEnv (env);
2034     }
2035
2036   _Jv_JNI_LocalFrame *frame
2037     = (_Jv_JNI_LocalFrame *) _Jv_MallocUnchecked (sizeof (_Jv_JNI_LocalFrame)
2038                                                   + (FRAME_SIZE
2039                                                      * sizeof (jobject)));
2040
2041   frame->marker = MARK_SYSTEM;
2042   frame->size = FRAME_SIZE;
2043   frame->next = env->locals;
2044
2045   for (int i = 0; i < frame->size; ++i)
2046     frame->vec[i] = NULL;
2047
2048   env->locals = frame;
2049   env->ex = NULL;
2050
2051   return env;
2052 }
2053
2054 // Return the function which implements a particular JNI method.  If
2055 // we can't find the function, we throw the appropriate exception.
2056 // This is `extern "C"' because the compiler uses it.
2057 extern "C" void *
2058 _Jv_LookupJNIMethod (jclass klass, _Jv_Utf8Const *name,
2059                      _Jv_Utf8Const *signature, MAYBE_UNUSED int args_size)
2060 {
2061   int name_length = name->len();
2062   int sig_length = signature->len();
2063   char buf[10 + 6 * (name_length + sig_length) + 12];
2064   int long_start;
2065   void *function;
2066
2067   // Synchronize on something convenient.  Right now we use the hash.
2068   JvSynchronize sync (global_ref_table);
2069
2070   // First see if we have an override in the hash table.
2071   strncpy (buf, name->chars (), name_length);
2072   buf[name_length] = '\0';
2073   strncpy (buf + name_length + 1, signature->chars (), sig_length);
2074   buf[name_length + sig_length + 1] = '\0';
2075   JNINativeMethod meth;
2076   meth.name = buf;
2077   meth.signature = buf + name_length + 1;
2078   function = nathash_find (&meth);
2079   if (function != NULL)
2080     return function;
2081
2082   // If there was no override, then look in the symbol table.
2083   buf[0] = '_';
2084   mangled_name (klass, name, signature, buf + 1, &long_start);
2085   char c = buf[long_start + 1];
2086   buf[long_start + 1] = '\0';
2087
2088   function = _Jv_FindSymbolInExecutable (buf + 1);
2089 #ifdef WIN32
2090   // On Win32, we use the "stdcall" calling convention (see JNICALL
2091   // in jni.h).
2092   //
2093   // For a function named 'fooBar' that takes 'nn' bytes as arguments,
2094   // by default, MinGW GCC exports it as 'fooBar@nn', MSVC exports it
2095   // as '_fooBar@nn' and Borland C exports it as 'fooBar'. We try to
2096   // take care of all these variations here.
2097
2098   char asz_buf[12];    /* '@' + '2147483647' (32-bit INT_MAX) + '\0' */
2099   char long_nm_sv[11]; /* Ditto, except for the '\0'. */
2100
2101   if (function == NULL)
2102     {
2103       // We have tried searching for the 'fooBar' form (BCC) - now
2104       // try the others.
2105
2106       // First, save the part of the long name that will be damaged
2107       // by appending '@nn'.
2108       memcpy (long_nm_sv, (buf + long_start + 1 + 1), sizeof (long_nm_sv));
2109
2110       sprintf (asz_buf, "@%d", args_size);
2111       strcat (buf, asz_buf);
2112
2113       // Search for the '_fooBar@nn' form (MSVC).
2114       function = _Jv_FindSymbolInExecutable (buf);
2115
2116       if (function == NULL)
2117         {
2118           // Search for the 'fooBar@nn' form (MinGW GCC).
2119           function = _Jv_FindSymbolInExecutable (buf + 1);
2120         }
2121     }
2122 #endif /* WIN32 */
2123
2124   if (function == NULL)
2125     {
2126       buf[long_start + 1] = c;
2127 #ifdef WIN32
2128       // Restore the part of the long name that was damaged by
2129       // appending the '@nn'.
2130       memcpy ((buf + long_start + 1 + 1), long_nm_sv, sizeof (long_nm_sv));
2131 #endif /* WIN32 */
2132       function = _Jv_FindSymbolInExecutable (buf + 1);
2133       if (function == NULL)
2134         {
2135 #ifdef WIN32
2136           strcat (buf, asz_buf);
2137           function = _Jv_FindSymbolInExecutable (buf);
2138           if (function == NULL)
2139             function = _Jv_FindSymbolInExecutable (buf + 1);
2140
2141           if (function == NULL)
2142 #endif /* WIN32 */
2143             {
2144               jstring str = JvNewStringUTF (name->chars ());
2145               throw new java::lang::UnsatisfiedLinkError (str);
2146             }
2147         }
2148     }
2149
2150   return function;
2151 }
2152
2153 #ifdef INTERPRETER
2154
2155 // This function is the stub which is used to turn an ordinary (CNI)
2156 // method call into a JNI call.
2157 void
2158 _Jv_JNIMethod::call (ffi_cif *, void *ret, ffi_raw *args, void *__this)
2159 {
2160   _Jv_JNIMethod* _this = (_Jv_JNIMethod *) __this;
2161
2162   JNIEnv *env = _Jv_GetJNIEnvNewFrame (_this->defining_class);
2163
2164   // FIXME: we should mark every reference parameter as a local.  For
2165   // now we assume a conservative GC, and we assume that the
2166   // references are on the stack somewhere.
2167
2168   // We cache the value that we find, of course, but if we don't find
2169   // a value we don't cache that fact -- we might subsequently load a
2170   // library which finds the function in question.
2171   {
2172     // Synchronize on a convenient object to ensure sanity in case two
2173     // threads reach this point for the same function at the same
2174     // time.
2175     JvSynchronize sync (global_ref_table);
2176     if (_this->function == NULL)
2177       {
2178         int args_size = sizeof (JNIEnv *) + _this->args_raw_size;
2179
2180         if (_this->self->accflags & java::lang::reflect::Modifier::STATIC)
2181           args_size += sizeof (_this->defining_class);
2182
2183         _this->function = _Jv_LookupJNIMethod (_this->defining_class,
2184                                                _this->self->name,
2185                                                _this->self->signature,
2186                                                args_size);
2187       }
2188   }
2189
2190   JvAssert (_this->args_raw_size % sizeof (ffi_raw) == 0);
2191   ffi_raw real_args[2 + _this->args_raw_size / sizeof (ffi_raw)];
2192   int offset = 0;
2193
2194   // First argument is always the environment pointer.
2195   real_args[offset++].ptr = env;
2196
2197   // For a static method, we pass in the Class.  For non-static
2198   // methods, the `this' argument is already handled.
2199   if ((_this->self->accflags & java::lang::reflect::Modifier::STATIC))
2200     real_args[offset++].ptr = _this->defining_class;
2201
2202   // In libgcj, the callee synchronizes.
2203   jobject sync = NULL;
2204   if ((_this->self->accflags & java::lang::reflect::Modifier::SYNCHRONIZED))
2205     {
2206       if ((_this->self->accflags & java::lang::reflect::Modifier::STATIC))
2207         sync = _this->defining_class;
2208       else
2209         sync = (jobject) args[0].ptr;
2210       _Jv_MonitorEnter (sync);
2211     }
2212
2213   // Copy over passed-in arguments.
2214   memcpy (&real_args[offset], args, _this->args_raw_size);
2215
2216   // The actual call to the JNI function.
2217 #if FFI_NATIVE_RAW_API
2218   ffi_raw_call (&_this->jni_cif, (void (*)()) _this->function,
2219                 ret, real_args);
2220 #else
2221   ffi_java_raw_call (&_this->jni_cif, (void (*)()) _this->function,
2222                      ret, real_args);
2223 #endif
2224
2225   if (sync != NULL)
2226     _Jv_MonitorExit (sync);
2227
2228   _Jv_JNI_PopSystemFrame (env);
2229 }
2230
2231 #endif /* INTERPRETER */
2232
2233 \f
2234
2235 //
2236 // Invocation API.
2237 //
2238
2239 // An internal helper function.
2240 static jint
2241 _Jv_JNI_AttachCurrentThread (JavaVM *, jstring name, void **penv,
2242                              void *args, jboolean is_daemon)
2243 {
2244   JavaVMAttachArgs *attach = reinterpret_cast<JavaVMAttachArgs *> (args);
2245   java::lang::ThreadGroup *group = NULL;
2246
2247   if (attach)
2248     {
2249       // FIXME: do we really want to support 1.1?
2250       if (attach->version != JNI_VERSION_1_4
2251           && attach->version != JNI_VERSION_1_2
2252           && attach->version != JNI_VERSION_1_1)
2253         return JNI_EVERSION;
2254
2255       JvAssert (java::lang::ThreadGroup::class$.isInstance (attach->group));
2256       group = reinterpret_cast<java::lang::ThreadGroup *> (attach->group);
2257     }
2258
2259   // Attaching an already-attached thread is a no-op.
2260   if (_Jv_GetCurrentJNIEnv () != NULL)
2261     return 0;
2262
2263   JNIEnv *env = (JNIEnv *) _Jv_MallocUnchecked (sizeof (JNIEnv));
2264   if (env == NULL)
2265     return JNI_ERR;
2266   env->p = &_Jv_JNIFunctions;
2267   env->ex = NULL;
2268   env->klass = NULL;
2269   env->locals
2270     = (_Jv_JNI_LocalFrame *) _Jv_MallocUnchecked (sizeof (_Jv_JNI_LocalFrame)
2271                                                   + (FRAME_SIZE
2272                                                      * sizeof (jobject)));
2273   if (env->locals == NULL)
2274     {
2275       _Jv_Free (env);
2276       return JNI_ERR;
2277     }
2278
2279   env->locals->marker = MARK_SYSTEM;
2280   env->locals->size = FRAME_SIZE;
2281   env->locals->next = NULL;
2282
2283   for (int i = 0; i < env->locals->size; ++i)
2284     env->locals->vec[i] = NULL;
2285
2286   *penv = reinterpret_cast<void *> (env);
2287
2288   // This thread might already be a Java thread -- this function might
2289   // have been called simply to set the new JNIEnv.
2290   if (_Jv_ThreadCurrent () == NULL)
2291     {
2292       try
2293         {
2294           if (is_daemon)
2295             _Jv_AttachCurrentThreadAsDaemon (name, group);
2296           else
2297             _Jv_AttachCurrentThread (name, group);
2298         }
2299       catch (jthrowable t)
2300         {
2301           return JNI_ERR;
2302         }
2303     }
2304   _Jv_SetCurrentJNIEnv (env);
2305
2306   return 0;
2307 }
2308
2309 // This is the one actually used by JNI.
2310 static jint JNICALL
2311 _Jv_JNI_AttachCurrentThread (JavaVM *vm, void **penv, void *args)
2312 {
2313   return _Jv_JNI_AttachCurrentThread (vm, NULL, penv, args, false);
2314 }
2315
2316 static jint JNICALL
2317 _Jv_JNI_AttachCurrentThreadAsDaemon (JavaVM *vm, void **penv,
2318                                      void *args)
2319 {
2320   return _Jv_JNI_AttachCurrentThread (vm, NULL, penv, args, true);
2321 }
2322
2323 static jint JNICALL
2324 _Jv_JNI_DestroyJavaVM (JavaVM *vm)
2325 {
2326   JvAssert (the_vm && vm == the_vm);
2327
2328   JNIEnv *env;
2329   if (_Jv_ThreadCurrent () != NULL)
2330     {
2331       jstring main_name;
2332       // This sucks.
2333       try
2334         {
2335           main_name = JvNewStringLatin1 ("main");
2336         }
2337       catch (jthrowable t)
2338         {
2339           return JNI_ERR;
2340         }
2341
2342       jint r = _Jv_JNI_AttachCurrentThread (vm, main_name,
2343                                             reinterpret_cast<void **> (&env),
2344                                             NULL, false);
2345       if (r < 0)
2346         return r;
2347     }
2348   else
2349     env = _Jv_GetCurrentJNIEnv ();
2350
2351   _Jv_ThreadWait ();
2352
2353   // Docs say that this always returns an error code.
2354   return JNI_ERR;
2355 }
2356
2357 jint JNICALL
2358 _Jv_JNI_DetachCurrentThread (JavaVM *)
2359 {
2360   jint code = _Jv_DetachCurrentThread ();
2361   return code  ? JNI_EDETACHED : 0;
2362 }
2363
2364 static jint JNICALL
2365 _Jv_JNI_GetEnv (JavaVM *, void **penv, jint version)
2366 {
2367   if (_Jv_ThreadCurrent () == NULL)
2368     {
2369       *penv = NULL;
2370       return JNI_EDETACHED;
2371     }
2372
2373 #ifdef ENABLE_JVMPI
2374   // Handle JVMPI requests.
2375   if (version == JVMPI_VERSION_1)
2376     {
2377       *penv = (void *) &_Jv_JVMPI_Interface;
2378       return 0;
2379     }
2380 #endif
2381
2382   // FIXME: do we really want to support 1.1?
2383   if (version != JNI_VERSION_1_4 && version != JNI_VERSION_1_2
2384       && version != JNI_VERSION_1_1)
2385     {
2386       *penv = NULL;
2387       return JNI_EVERSION;
2388     }
2389
2390   *penv = (void *) _Jv_GetCurrentJNIEnv ();
2391   return 0;
2392 }
2393
2394 jint JNICALL
2395 JNI_GetDefaultJavaVMInitArgs (void *args)
2396 {
2397   jint version = * (jint *) args;
2398   // Here we only support 1.2 and 1.4.
2399   if (version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4)
2400     return JNI_EVERSION;
2401
2402   JavaVMInitArgs *ia = reinterpret_cast<JavaVMInitArgs *> (args);
2403   ia->version = JNI_VERSION_1_4;
2404   ia->nOptions = 0;
2405   ia->options = NULL;
2406   ia->ignoreUnrecognized = true;
2407
2408   return 0;
2409 }
2410
2411 jint JNICALL
2412 JNI_CreateJavaVM (JavaVM **vm, void **penv, void *args)
2413 {
2414   JvAssert (! the_vm);
2415
2416   _Jv_CreateJavaVM (NULL);
2417
2418   // FIXME: synchronize
2419   JavaVM *nvm = (JavaVM *) _Jv_MallocUnchecked (sizeof (JavaVM));
2420   if (nvm == NULL)
2421     return JNI_ERR;
2422   nvm->functions = &_Jv_JNI_InvokeFunctions;
2423
2424   // Parse the arguments.
2425   if (args != NULL)
2426     {
2427       jint version = * (jint *) args;
2428       // We only support 1.2 and 1.4.
2429       if (version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4)
2430         return JNI_EVERSION;
2431       JavaVMInitArgs *ia = reinterpret_cast<JavaVMInitArgs *> (args);
2432       for (int i = 0; i < ia->nOptions; ++i)
2433         {
2434           if (! strcmp (ia->options[i].optionString, "vfprintf")
2435               || ! strcmp (ia->options[i].optionString, "exit")
2436               || ! strcmp (ia->options[i].optionString, "abort"))
2437             {
2438               // We are required to recognize these, but for now we
2439               // don't handle them in any way.  FIXME.
2440               continue;
2441             }
2442           else if (! strncmp (ia->options[i].optionString,
2443                               "-verbose", sizeof ("-verbose") - 1))
2444             {
2445               // We don't do anything with this option either.  We
2446               // might want to make sure the argument is valid, but we
2447               // don't really care all that much for now.
2448               continue;
2449             }
2450           else if (! strncmp (ia->options[i].optionString, "-D", 2))
2451             {
2452               // FIXME.
2453               continue;
2454             }
2455           else if (ia->ignoreUnrecognized)
2456             {
2457               if (ia->options[i].optionString[0] == '_'
2458                   || ! strncmp (ia->options[i].optionString, "-X", 2))
2459                 continue;
2460             }
2461
2462           return JNI_ERR;
2463         }
2464     }
2465
2466   jint r =_Jv_JNI_AttachCurrentThread (nvm, penv, NULL);
2467   if (r < 0)
2468     return r;
2469
2470   the_vm = nvm;
2471   *vm = the_vm;
2472
2473   return 0;
2474 }
2475
2476 jint JNICALL
2477 JNI_GetCreatedJavaVMs (JavaVM **vm_buffer, jsize buf_len, jsize *n_vms)
2478 {
2479   if (buf_len <= 0)
2480     return JNI_ERR;
2481
2482   // We only support a single VM.
2483   if (the_vm != NULL)
2484     {
2485       vm_buffer[0] = the_vm;
2486       *n_vms = 1;
2487     }
2488   else
2489     *n_vms = 0;
2490   return 0;
2491 }
2492
2493 JavaVM *
2494 _Jv_GetJavaVM ()
2495 {
2496   // FIXME: synchronize
2497   if (! the_vm)
2498     {
2499       JavaVM *nvm = (JavaVM *) _Jv_MallocUnchecked (sizeof (JavaVM));
2500       if (nvm != NULL)
2501         nvm->functions = &_Jv_JNI_InvokeFunctions;
2502       the_vm = nvm;
2503     }
2504
2505   // If this is a Java thread, we want to make sure it has an
2506   // associated JNIEnv.
2507   if (_Jv_ThreadCurrent () != NULL)
2508     {
2509       void *ignore;
2510       _Jv_JNI_AttachCurrentThread (the_vm, &ignore, NULL);
2511     }
2512
2513   return the_vm;
2514 }
2515
2516 static jint JNICALL
2517 _Jv_JNI_GetJavaVM (JNIEnv *, JavaVM **vm)
2518 {
2519   *vm = _Jv_GetJavaVM ();
2520   return *vm == NULL ? JNI_ERR : JNI_OK;
2521 }
2522
2523 \f
2524
2525 #define RESERVED NULL
2526
2527 struct JNINativeInterface _Jv_JNIFunctions =
2528 {
2529   RESERVED,
2530   RESERVED,
2531   RESERVED,
2532   RESERVED,
2533   _Jv_JNI_GetVersion,           // GetVersion
2534   _Jv_JNI_DefineClass,          // DefineClass
2535   _Jv_JNI_FindClass,            // FindClass
2536   _Jv_JNI_FromReflectedMethod,  // FromReflectedMethod
2537   _Jv_JNI_FromReflectedField,   // FromReflectedField
2538   _Jv_JNI_ToReflectedMethod,    // ToReflectedMethod
2539   _Jv_JNI_GetSuperclass,        // GetSuperclass
2540   _Jv_JNI_IsAssignableFrom,     // IsAssignableFrom
2541   _Jv_JNI_ToReflectedField,     // ToReflectedField
2542   _Jv_JNI_Throw,                // Throw
2543   _Jv_JNI_ThrowNew,             // ThrowNew
2544   _Jv_JNI_ExceptionOccurred,    // ExceptionOccurred
2545   _Jv_JNI_ExceptionDescribe,    // ExceptionDescribe
2546   _Jv_JNI_ExceptionClear,       // ExceptionClear
2547   _Jv_JNI_FatalError,           // FatalError
2548
2549   _Jv_JNI_PushLocalFrame,       // PushLocalFrame
2550   _Jv_JNI_PopLocalFrame,        // PopLocalFrame
2551   _Jv_JNI_NewGlobalRef,         // NewGlobalRef
2552   _Jv_JNI_DeleteGlobalRef,      // DeleteGlobalRef
2553   _Jv_JNI_DeleteLocalRef,       // DeleteLocalRef
2554
2555   _Jv_JNI_IsSameObject,         // IsSameObject
2556
2557   _Jv_JNI_NewLocalRef,          // NewLocalRef
2558   _Jv_JNI_EnsureLocalCapacity,  // EnsureLocalCapacity
2559
2560   _Jv_JNI_AllocObject,              // AllocObject
2561   _Jv_JNI_NewObject,                // NewObject
2562   _Jv_JNI_NewObjectV,               // NewObjectV
2563   _Jv_JNI_NewObjectA,               // NewObjectA
2564   _Jv_JNI_GetObjectClass,           // GetObjectClass
2565   _Jv_JNI_IsInstanceOf,             // IsInstanceOf
2566   _Jv_JNI_GetAnyMethodID<false>,    // GetMethodID
2567
2568   _Jv_JNI_CallMethod<jobject>,          // CallObjectMethod
2569   _Jv_JNI_CallMethodV<jobject>,         // CallObjectMethodV
2570   _Jv_JNI_CallMethodA<jobject>,         // CallObjectMethodA
2571   _Jv_JNI_CallMethod<jboolean>,         // CallBooleanMethod
2572   _Jv_JNI_CallMethodV<jboolean>,        // CallBooleanMethodV
2573   _Jv_JNI_CallMethodA<jboolean>,        // CallBooleanMethodA
2574   _Jv_JNI_CallMethod<jbyte>,            // CallByteMethod
2575   _Jv_JNI_CallMethodV<jbyte>,           // CallByteMethodV
2576   _Jv_JNI_CallMethodA<jbyte>,           // CallByteMethodA
2577   _Jv_JNI_CallMethod<jchar>,            // CallCharMethod
2578   _Jv_JNI_CallMethodV<jchar>,           // CallCharMethodV
2579   _Jv_JNI_CallMethodA<jchar>,           // CallCharMethodA
2580   _Jv_JNI_CallMethod<jshort>,           // CallShortMethod
2581   _Jv_JNI_CallMethodV<jshort>,          // CallShortMethodV
2582   _Jv_JNI_CallMethodA<jshort>,          // CallShortMethodA
2583   _Jv_JNI_CallMethod<jint>,             // CallIntMethod
2584   _Jv_JNI_CallMethodV<jint>,            // CallIntMethodV
2585   _Jv_JNI_CallMethodA<jint>,            // CallIntMethodA
2586   _Jv_JNI_CallMethod<jlong>,            // CallLongMethod
2587   _Jv_JNI_CallMethodV<jlong>,           // CallLongMethodV
2588   _Jv_JNI_CallMethodA<jlong>,           // CallLongMethodA
2589   _Jv_JNI_CallMethod<jfloat>,           // CallFloatMethod
2590   _Jv_JNI_CallMethodV<jfloat>,          // CallFloatMethodV
2591   _Jv_JNI_CallMethodA<jfloat>,          // CallFloatMethodA
2592   _Jv_JNI_CallMethod<jdouble>,          // CallDoubleMethod
2593   _Jv_JNI_CallMethodV<jdouble>,         // CallDoubleMethodV
2594   _Jv_JNI_CallMethodA<jdouble>,         // CallDoubleMethodA
2595   _Jv_JNI_CallVoidMethod,               // CallVoidMethod
2596   _Jv_JNI_CallVoidMethodV,              // CallVoidMethodV
2597   _Jv_JNI_CallVoidMethodA,              // CallVoidMethodA
2598
2599   // Nonvirtual method invocation functions follow.
2600   _Jv_JNI_CallAnyMethod<jobject, nonvirtual>,   // CallNonvirtualObjectMethod
2601   _Jv_JNI_CallAnyMethodV<jobject, nonvirtual>,  // CallNonvirtualObjectMethodV
2602   _Jv_JNI_CallAnyMethodA<jobject, nonvirtual>,  // CallNonvirtualObjectMethodA
2603   _Jv_JNI_CallAnyMethod<jboolean, nonvirtual>,  // CallNonvirtualBooleanMethod
2604   _Jv_JNI_CallAnyMethodV<jboolean, nonvirtual>, // CallNonvirtualBooleanMethodV
2605   _Jv_JNI_CallAnyMethodA<jboolean, nonvirtual>, // CallNonvirtualBooleanMethodA
2606   _Jv_JNI_CallAnyMethod<jbyte, nonvirtual>,     // CallNonvirtualByteMethod
2607   _Jv_JNI_CallAnyMethodV<jbyte, nonvirtual>,    // CallNonvirtualByteMethodV
2608   _Jv_JNI_CallAnyMethodA<jbyte, nonvirtual>,    // CallNonvirtualByteMethodA
2609   _Jv_JNI_CallAnyMethod<jchar, nonvirtual>,     // CallNonvirtualCharMethod
2610   _Jv_JNI_CallAnyMethodV<jchar, nonvirtual>,    // CallNonvirtualCharMethodV
2611   _Jv_JNI_CallAnyMethodA<jchar, nonvirtual>,    // CallNonvirtualCharMethodA
2612   _Jv_JNI_CallAnyMethod<jshort, nonvirtual>,    // CallNonvirtualShortMethod
2613   _Jv_JNI_CallAnyMethodV<jshort, nonvirtual>,   // CallNonvirtualShortMethodV
2614   _Jv_JNI_CallAnyMethodA<jshort, nonvirtual>,   // CallNonvirtualShortMethodA
2615   _Jv_JNI_CallAnyMethod<jint, nonvirtual>,      // CallNonvirtualIntMethod
2616   _Jv_JNI_CallAnyMethodV<jint, nonvirtual>,     // CallNonvirtualIntMethodV
2617   _Jv_JNI_CallAnyMethodA<jint, nonvirtual>,     // CallNonvirtualIntMethodA
2618   _Jv_JNI_CallAnyMethod<jlong, nonvirtual>,     // CallNonvirtualLongMethod
2619   _Jv_JNI_CallAnyMethodV<jlong, nonvirtual>,    // CallNonvirtualLongMethodV
2620   _Jv_JNI_CallAnyMethodA<jlong, nonvirtual>,    // CallNonvirtualLongMethodA
2621   _Jv_JNI_CallAnyMethod<jfloat, nonvirtual>,    // CallNonvirtualFloatMethod
2622   _Jv_JNI_CallAnyMethodV<jfloat, nonvirtual>,   // CallNonvirtualFloatMethodV
2623   _Jv_JNI_CallAnyMethodA<jfloat, nonvirtual>,   // CallNonvirtualFloatMethodA
2624   _Jv_JNI_CallAnyMethod<jdouble, nonvirtual>,   // CallNonvirtualDoubleMethod
2625   _Jv_JNI_CallAnyMethodV<jdouble, nonvirtual>,  // CallNonvirtualDoubleMethodV
2626   _Jv_JNI_CallAnyMethodA<jdouble, nonvirtual>,  // CallNonvirtualDoubleMethodA
2627   _Jv_JNI_CallAnyVoidMethod<nonvirtual>,        // CallNonvirtualVoidMethod
2628   _Jv_JNI_CallAnyVoidMethodV<nonvirtual>,       // CallNonvirtualVoidMethodV
2629   _Jv_JNI_CallAnyVoidMethodA<nonvirtual>,       // CallNonvirtualVoidMethodA
2630
2631   _Jv_JNI_GetAnyFieldID<false>, // GetFieldID
2632   _Jv_JNI_GetField<jobject>,    // GetObjectField
2633   _Jv_JNI_GetField<jboolean>,   // GetBooleanField
2634   _Jv_JNI_GetField<jbyte>,      // GetByteField
2635   _Jv_JNI_GetField<jchar>,      // GetCharField
2636   _Jv_JNI_GetField<jshort>,     // GetShortField
2637   _Jv_JNI_GetField<jint>,       // GetIntField
2638   _Jv_JNI_GetField<jlong>,      // GetLongField
2639   _Jv_JNI_GetField<jfloat>,     // GetFloatField
2640   _Jv_JNI_GetField<jdouble>,    // GetDoubleField
2641   _Jv_JNI_SetField,             // SetObjectField
2642   _Jv_JNI_SetField,             // SetBooleanField
2643   _Jv_JNI_SetField,             // SetByteField
2644   _Jv_JNI_SetField,             // SetCharField
2645   _Jv_JNI_SetField,             // SetShortField
2646   _Jv_JNI_SetField,             // SetIntField
2647   _Jv_JNI_SetField,             // SetLongField
2648   _Jv_JNI_SetField,             // SetFloatField
2649   _Jv_JNI_SetField,             // SetDoubleField
2650   _Jv_JNI_GetAnyMethodID<true>, // GetStaticMethodID
2651
2652   _Jv_JNI_CallStaticMethod<jobject>,      // CallStaticObjectMethod
2653   _Jv_JNI_CallStaticMethodV<jobject>,     // CallStaticObjectMethodV
2654   _Jv_JNI_CallStaticMethodA<jobject>,     // CallStaticObjectMethodA
2655   _Jv_JNI_CallStaticMethod<jboolean>,     // CallStaticBooleanMethod
2656   _Jv_JNI_CallStaticMethodV<jboolean>,    // CallStaticBooleanMethodV
2657   _Jv_JNI_CallStaticMethodA<jboolean>,    // CallStaticBooleanMethodA
2658   _Jv_JNI_CallStaticMethod<jbyte>,        // CallStaticByteMethod
2659   _Jv_JNI_CallStaticMethodV<jbyte>,       // CallStaticByteMethodV
2660   _Jv_JNI_CallStaticMethodA<jbyte>,       // CallStaticByteMethodA
2661   _Jv_JNI_CallStaticMethod<jchar>,        // CallStaticCharMethod
2662   _Jv_JNI_CallStaticMethodV<jchar>,       // CallStaticCharMethodV
2663   _Jv_JNI_CallStaticMethodA<jchar>,       // CallStaticCharMethodA
2664   _Jv_JNI_CallStaticMethod<jshort>,       // CallStaticShortMethod
2665   _Jv_JNI_CallStaticMethodV<jshort>,      // CallStaticShortMethodV
2666   _Jv_JNI_CallStaticMethodA<jshort>,      // CallStaticShortMethodA
2667   _Jv_JNI_CallStaticMethod<jint>,         // CallStaticIntMethod
2668   _Jv_JNI_CallStaticMethodV<jint>,        // CallStaticIntMethodV
2669   _Jv_JNI_CallStaticMethodA<jint>,        // CallStaticIntMethodA
2670   _Jv_JNI_CallStaticMethod<jlong>,        // CallStaticLongMethod
2671   _Jv_JNI_CallStaticMethodV<jlong>,       // CallStaticLongMethodV
2672   _Jv_JNI_CallStaticMethodA<jlong>,       // CallStaticLongMethodA
2673   _Jv_JNI_CallStaticMethod<jfloat>,       // CallStaticFloatMethod
2674   _Jv_JNI_CallStaticMethodV<jfloat>,      // CallStaticFloatMethodV
2675   _Jv_JNI_CallStaticMethodA<jfloat>,      // CallStaticFloatMethodA
2676   _Jv_JNI_CallStaticMethod<jdouble>,      // CallStaticDoubleMethod
2677   _Jv_JNI_CallStaticMethodV<jdouble>,     // CallStaticDoubleMethodV
2678   _Jv_JNI_CallStaticMethodA<jdouble>,     // CallStaticDoubleMethodA
2679   _Jv_JNI_CallStaticVoidMethod,           // CallStaticVoidMethod
2680   _Jv_JNI_CallStaticVoidMethodV,          // CallStaticVoidMethodV
2681   _Jv_JNI_CallStaticVoidMethodA,          // CallStaticVoidMethodA
2682
2683   _Jv_JNI_GetAnyFieldID<true>,         // GetStaticFieldID
2684   _Jv_JNI_GetStaticField<jobject>,     // GetStaticObjectField
2685   _Jv_JNI_GetStaticField<jboolean>,    // GetStaticBooleanField
2686   _Jv_JNI_GetStaticField<jbyte>,       // GetStaticByteField
2687   _Jv_JNI_GetStaticField<jchar>,       // GetStaticCharField
2688   _Jv_JNI_GetStaticField<jshort>,      // GetStaticShortField
2689   _Jv_JNI_GetStaticField<jint>,        // GetStaticIntField
2690   _Jv_JNI_GetStaticField<jlong>,       // GetStaticLongField
2691   _Jv_JNI_GetStaticField<jfloat>,      // GetStaticFloatField
2692   _Jv_JNI_GetStaticField<jdouble>,     // GetStaticDoubleField
2693   _Jv_JNI_SetStaticField,              // SetStaticObjectField
2694   _Jv_JNI_SetStaticField,              // SetStaticBooleanField
2695   _Jv_JNI_SetStaticField,              // SetStaticByteField
2696   _Jv_JNI_SetStaticField,              // SetStaticCharField
2697   _Jv_JNI_SetStaticField,              // SetStaticShortField
2698   _Jv_JNI_SetStaticField,              // SetStaticIntField
2699   _Jv_JNI_SetStaticField,              // SetStaticLongField
2700   _Jv_JNI_SetStaticField,              // SetStaticFloatField
2701   _Jv_JNI_SetStaticField,              // SetStaticDoubleField
2702   _Jv_JNI_NewString,                   // NewString
2703   _Jv_JNI_GetStringLength,             // GetStringLength
2704   _Jv_JNI_GetStringChars,              // GetStringChars
2705   _Jv_JNI_ReleaseStringChars,          // ReleaseStringChars
2706   _Jv_JNI_NewStringUTF,                // NewStringUTF
2707   _Jv_JNI_GetStringUTFLength,          // GetStringUTFLength
2708   _Jv_JNI_GetStringUTFChars,           // GetStringUTFChars
2709   _Jv_JNI_ReleaseStringUTFChars,       // ReleaseStringUTFChars
2710   _Jv_JNI_GetArrayLength,              // GetArrayLength
2711   _Jv_JNI_NewObjectArray,              // NewObjectArray
2712   _Jv_JNI_GetObjectArrayElement,       // GetObjectArrayElement
2713   _Jv_JNI_SetObjectArrayElement,       // SetObjectArrayElement
2714   _Jv_JNI_NewPrimitiveArray<jboolean, JvPrimClass (boolean)>,
2715                                                             // NewBooleanArray
2716   _Jv_JNI_NewPrimitiveArray<jbyte, JvPrimClass (byte)>,     // NewByteArray
2717   _Jv_JNI_NewPrimitiveArray<jchar, JvPrimClass (char)>,     // NewCharArray
2718   _Jv_JNI_NewPrimitiveArray<jshort, JvPrimClass (short)>,   // NewShortArray
2719   _Jv_JNI_NewPrimitiveArray<jint, JvPrimClass (int)>,       // NewIntArray
2720   _Jv_JNI_NewPrimitiveArray<jlong, JvPrimClass (long)>,     // NewLongArray
2721   _Jv_JNI_NewPrimitiveArray<jfloat, JvPrimClass (float)>,   // NewFloatArray
2722   _Jv_JNI_NewPrimitiveArray<jdouble, JvPrimClass (double)>, // NewDoubleArray
2723   _Jv_JNI_GetPrimitiveArrayElements<jboolean, JvPrimClass (boolean)>,
2724                                             // GetBooleanArrayElements
2725   _Jv_JNI_GetPrimitiveArrayElements<jbyte, JvPrimClass (byte)>,
2726                                             // GetByteArrayElements
2727   _Jv_JNI_GetPrimitiveArrayElements<jchar, JvPrimClass (char)>,
2728                                             // GetCharArrayElements
2729   _Jv_JNI_GetPrimitiveArrayElements<jshort, JvPrimClass (short)>,
2730                                             // GetShortArrayElements
2731   _Jv_JNI_GetPrimitiveArrayElements<jint, JvPrimClass (int)>,
2732                                             // GetIntArrayElements
2733   _Jv_JNI_GetPrimitiveArrayElements<jlong, JvPrimClass (long)>,
2734                                             // GetLongArrayElements
2735   _Jv_JNI_GetPrimitiveArrayElements<jfloat, JvPrimClass (float)>,
2736                                             // GetFloatArrayElements
2737   _Jv_JNI_GetPrimitiveArrayElements<jdouble, JvPrimClass (double)>,
2738                                             // GetDoubleArrayElements
2739   _Jv_JNI_ReleasePrimitiveArrayElements<jboolean, JvPrimClass (boolean)>,
2740                                             // ReleaseBooleanArrayElements
2741   _Jv_JNI_ReleasePrimitiveArrayElements<jbyte, JvPrimClass (byte)>,
2742                                             // ReleaseByteArrayElements
2743   _Jv_JNI_ReleasePrimitiveArrayElements<jchar, JvPrimClass (char)>,
2744                                             // ReleaseCharArrayElements
2745   _Jv_JNI_ReleasePrimitiveArrayElements<jshort, JvPrimClass (short)>,
2746                                             // ReleaseShortArrayElements
2747   _Jv_JNI_ReleasePrimitiveArrayElements<jint, JvPrimClass (int)>,
2748                                             // ReleaseIntArrayElements
2749   _Jv_JNI_ReleasePrimitiveArrayElements<jlong, JvPrimClass (long)>,
2750                                             // ReleaseLongArrayElements
2751   _Jv_JNI_ReleasePrimitiveArrayElements<jfloat, JvPrimClass (float)>,
2752                                             // ReleaseFloatArrayElements
2753   _Jv_JNI_ReleasePrimitiveArrayElements<jdouble, JvPrimClass (double)>,
2754                                             // ReleaseDoubleArrayElements
2755   _Jv_JNI_GetPrimitiveArrayRegion<jboolean, JvPrimClass (boolean)>,
2756                                             // GetBooleanArrayRegion
2757   _Jv_JNI_GetPrimitiveArrayRegion<jbyte, JvPrimClass (byte)>,
2758                                             // GetByteArrayRegion
2759   _Jv_JNI_GetPrimitiveArrayRegion<jchar, JvPrimClass (char)>,
2760                                             // GetCharArrayRegion
2761   _Jv_JNI_GetPrimitiveArrayRegion<jshort, JvPrimClass (short)>,
2762                                             // GetShortArrayRegion
2763   _Jv_JNI_GetPrimitiveArrayRegion<jint, JvPrimClass (int)>,
2764                                             // GetIntArrayRegion
2765   _Jv_JNI_GetPrimitiveArrayRegion<jlong, JvPrimClass (long)>,
2766                                             // GetLongArrayRegion
2767   _Jv_JNI_GetPrimitiveArrayRegion<jfloat, JvPrimClass (float)>,
2768                                             // GetFloatArrayRegion
2769   _Jv_JNI_GetPrimitiveArrayRegion<jdouble, JvPrimClass (double)>,
2770                                             // GetDoubleArrayRegion
2771   _Jv_JNI_SetPrimitiveArrayRegion<jboolean, JvPrimClass (boolean)>,
2772                                             // SetBooleanArrayRegion
2773   _Jv_JNI_SetPrimitiveArrayRegion<jbyte, JvPrimClass (byte)>,
2774                                             // SetByteArrayRegion
2775   _Jv_JNI_SetPrimitiveArrayRegion<jchar, JvPrimClass (char)>,
2776                                             // SetCharArrayRegion
2777   _Jv_JNI_SetPrimitiveArrayRegion<jshort, JvPrimClass (short)>,
2778                                             // SetShortArrayRegion
2779   _Jv_JNI_SetPrimitiveArrayRegion<jint, JvPrimClass (int)>,
2780                                             // SetIntArrayRegion
2781   _Jv_JNI_SetPrimitiveArrayRegion<jlong, JvPrimClass (long)>,
2782                                             // SetLongArrayRegion
2783   _Jv_JNI_SetPrimitiveArrayRegion<jfloat, JvPrimClass (float)>,
2784                                             // SetFloatArrayRegion
2785   _Jv_JNI_SetPrimitiveArrayRegion<jdouble, JvPrimClass (double)>,
2786                                             // SetDoubleArrayRegion
2787   _Jv_JNI_RegisterNatives,                  // RegisterNatives
2788   _Jv_JNI_UnregisterNatives,                // UnregisterNatives
2789   _Jv_JNI_MonitorEnter,                     // MonitorEnter
2790   _Jv_JNI_MonitorExit,                      // MonitorExit
2791   _Jv_JNI_GetJavaVM,                        // GetJavaVM
2792
2793   _Jv_JNI_GetStringRegion,                  // GetStringRegion
2794   _Jv_JNI_GetStringUTFRegion,               // GetStringUTFRegion
2795   _Jv_JNI_GetPrimitiveArrayCritical,        // GetPrimitiveArrayCritical
2796   _Jv_JNI_ReleasePrimitiveArrayCritical,    // ReleasePrimitiveArrayCritical
2797   _Jv_JNI_GetStringCritical,                // GetStringCritical
2798   _Jv_JNI_ReleaseStringCritical,            // ReleaseStringCritical
2799
2800   _Jv_JNI_NewWeakGlobalRef,                 // NewWeakGlobalRef
2801   _Jv_JNI_DeleteWeakGlobalRef,              // DeleteWeakGlobalRef
2802
2803   _Jv_JNI_ExceptionCheck,                   // ExceptionCheck
2804
2805   _Jv_JNI_NewDirectByteBuffer,              // NewDirectByteBuffer
2806   _Jv_JNI_GetDirectBufferAddress,           // GetDirectBufferAddress
2807   _Jv_JNI_GetDirectBufferCapacity           // GetDirectBufferCapacity
2808 };
2809
2810 struct JNIInvokeInterface _Jv_JNI_InvokeFunctions =
2811 {
2812   RESERVED,
2813   RESERVED,
2814   RESERVED,
2815
2816   _Jv_JNI_DestroyJavaVM,
2817   _Jv_JNI_AttachCurrentThread,
2818   _Jv_JNI_DetachCurrentThread,
2819   _Jv_JNI_GetEnv,
2820   _Jv_JNI_AttachCurrentThreadAsDaemon
2821 };