Tue, 11 May 2010 14:35:43 -0700
6931180: Migration to recent versions of MS Platform SDK
6951582: Build problems on win64
Summary: Changes to enable building JDK7 with Microsoft Visual Studio 2010
Reviewed-by: ohair, art, ccheung, dcubed
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_jni.cpp.incl"
28 static jint CurrentVersion = JNI_VERSION_1_6;
31 // The DT_RETURN_MARK macros create a scoped object to fire the dtrace
32 // '-return' probe regardless of the return path is taken out of the function.
33 // Methods that have multiple return paths use this to avoid having to
34 // instrument each return path. Methods that use CHECK or THROW must use this
35 // since those macros can cause an immedate uninstrumented return.
36 //
37 // In order to get the return value, a reference to the variable containing
38 // the return value must be passed to the contructor of the object, and
39 // the return value must be set before return (since the mark object has
40 // a reference to it).
41 //
42 // Example:
43 // DT_RETURN_MARK_DECL(SomeFunc, int);
44 // JNI_ENTRY(int, SomeFunc, ...)
45 // int return_value = 0;
46 // DT_RETURN_MARK(SomeFunc, int, (const int&)return_value);
47 // foo(CHECK_0)
48 // return_value = 5;
49 // return return_value;
50 // JNI_END
51 #define DT_RETURN_MARK_DECL(name, type) \
52 HS_DTRACE_PROBE_DECL1(hotspot_jni, name##__return, type); \
53 DTRACE_ONLY( \
54 class DTraceReturnProbeMark_##name { \
55 public: \
56 const type& _ret_ref; \
57 DTraceReturnProbeMark_##name(const type& v) : _ret_ref(v) {} \
58 ~DTraceReturnProbeMark_##name() { \
59 HS_DTRACE_PROBE1(hotspot_jni, name##__return, _ret_ref); \
60 } \
61 } \
62 )
63 // Void functions are simpler since there's no return value
64 #define DT_VOID_RETURN_MARK_DECL(name) \
65 HS_DTRACE_PROBE_DECL0(hotspot_jni, name##__return); \
66 DTRACE_ONLY( \
67 class DTraceReturnProbeMark_##name { \
68 public: \
69 ~DTraceReturnProbeMark_##name() { \
70 HS_DTRACE_PROBE0(hotspot_jni, name##__return); \
71 } \
72 } \
73 )
76 // Place these macros in the function to mark the return. Non-void
77 // functions need the type and address of the return value.
78 #define DT_RETURN_MARK(name, type, ref) \
79 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark(ref) )
80 #define DT_VOID_RETURN_MARK(name) \
81 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark )
84 // Use these to select distinct code for floating-point vs. non-floating point
85 // situations. Used from within common macros where we need slightly
86 // different behavior for Float/Double
87 #define FP_SELECT_Boolean(intcode, fpcode) intcode
88 #define FP_SELECT_Byte(intcode, fpcode) intcode
89 #define FP_SELECT_Char(intcode, fpcode) intcode
90 #define FP_SELECT_Short(intcode, fpcode) intcode
91 #define FP_SELECT_Object(intcode, fpcode) intcode
92 #define FP_SELECT_Int(intcode, fpcode) intcode
93 #define FP_SELECT_Long(intcode, fpcode) intcode
94 #define FP_SELECT_Float(intcode, fpcode) fpcode
95 #define FP_SELECT_Double(intcode, fpcode) fpcode
96 #define FP_SELECT(TypeName, intcode, fpcode) \
97 FP_SELECT_##TypeName(intcode, fpcode)
99 #define COMMA ,
101 // Choose DT_RETURN_MARK macros based on the type: float/double -> void
102 // (dtrace doesn't do FP yet)
103 #define DT_RETURN_MARK_DECL_FOR(TypeName, name, type) \
104 FP_SELECT(TypeName, \
105 DT_RETURN_MARK_DECL(name, type), DT_VOID_RETURN_MARK_DECL(name) )
106 #define DT_RETURN_MARK_FOR(TypeName, name, type, ref) \
107 FP_SELECT(TypeName, \
108 DT_RETURN_MARK(name, type, ref), DT_VOID_RETURN_MARK(name) )
111 // out-of-line helpers for class jfieldIDWorkaround:
113 bool jfieldIDWorkaround::is_valid_jfieldID(klassOop k, jfieldID id) {
114 if (jfieldIDWorkaround::is_instance_jfieldID(k, id)) {
115 uintptr_t as_uint = (uintptr_t) id;
116 intptr_t offset = raw_instance_offset(id);
117 if (is_checked_jfieldID(id)) {
118 if (!klass_hash_ok(k, id)) {
119 return false;
120 }
121 }
122 return instanceKlass::cast(k)->contains_field_offset(offset);
123 } else {
124 JNIid* result = (JNIid*) id;
125 #ifdef ASSERT
126 return result != NULL && result->is_static_field_id();
127 #else
128 return result != NULL;
129 #endif
130 }
131 }
134 intptr_t jfieldIDWorkaround::encode_klass_hash(klassOop k, intptr_t offset) {
135 if (offset <= small_offset_mask) {
136 klassOop field_klass = k;
137 klassOop super_klass = Klass::cast(field_klass)->super();
138 // With compressed oops the most super class with nonstatic fields would
139 // be the owner of fields embedded in the header.
140 while (instanceKlass::cast(super_klass)->has_nonstatic_fields() &&
141 instanceKlass::cast(super_klass)->contains_field_offset(offset)) {
142 field_klass = super_klass; // super contains the field also
143 super_klass = Klass::cast(field_klass)->super();
144 }
145 debug_only(No_Safepoint_Verifier nosafepoint;)
146 uintptr_t klass_hash = field_klass->identity_hash();
147 return ((klass_hash & klass_mask) << klass_shift) | checked_mask_in_place;
148 } else {
149 #if 0
150 #ifndef PRODUCT
151 {
152 ResourceMark rm;
153 warning("VerifyJNIFields: long offset %d in %s", offset, Klass::cast(k)->external_name());
154 }
155 #endif
156 #endif
157 return 0;
158 }
159 }
161 bool jfieldIDWorkaround::klass_hash_ok(klassOop k, jfieldID id) {
162 uintptr_t as_uint = (uintptr_t) id;
163 intptr_t klass_hash = (as_uint >> klass_shift) & klass_mask;
164 do {
165 debug_only(No_Safepoint_Verifier nosafepoint;)
166 // Could use a non-blocking query for identity_hash here...
167 if ((k->identity_hash() & klass_mask) == klass_hash)
168 return true;
169 k = Klass::cast(k)->super();
170 } while (k != NULL);
171 return false;
172 }
174 void jfieldIDWorkaround::verify_instance_jfieldID(klassOop k, jfieldID id) {
175 guarantee(jfieldIDWorkaround::is_instance_jfieldID(k, id), "must be an instance field" );
176 uintptr_t as_uint = (uintptr_t) id;
177 intptr_t offset = raw_instance_offset(id);
178 if (VerifyJNIFields) {
179 if (is_checked_jfieldID(id)) {
180 guarantee(klass_hash_ok(k, id),
181 "Bug in native code: jfieldID class must match object");
182 } else {
183 #if 0
184 #ifndef PRODUCT
185 if (Verbose) {
186 ResourceMark rm;
187 warning("VerifyJNIFields: unverified offset %d for %s", offset, Klass::cast(k)->external_name());
188 }
189 #endif
190 #endif
191 }
192 }
193 guarantee(instanceKlass::cast(k)->contains_field_offset(offset),
194 "Bug in native code: jfieldID offset must address interior of object");
195 }
197 // Pick a reasonable higher bound for local capacity requested
198 // for EnsureLocalCapacity and PushLocalFrame. We don't want it too
199 // high because a test (or very unusual application) may try to allocate
200 // that many handles and run out of swap space. An implementation is
201 // permitted to allocate more handles than the ensured capacity, so this
202 // value is set high enough to prevent compatibility problems.
203 const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K;
206 // Wrapper to trace JNI functions
208 #ifdef ASSERT
209 Histogram* JNIHistogram;
210 static volatile jint JNIHistogram_lock = 0;
212 class JNITraceWrapper : public StackObj {
213 public:
214 JNITraceWrapper(const char* format, ...) {
215 if (TraceJNICalls) {
216 va_list ap;
217 va_start(ap, format);
218 tty->print("JNI ");
219 tty->vprint_cr(format, ap);
220 va_end(ap);
221 }
222 }
223 };
225 class JNIHistogramElement : public HistogramElement {
226 public:
227 JNIHistogramElement(const char* name);
228 };
230 JNIHistogramElement::JNIHistogramElement(const char* elementName) {
231 _name = elementName;
232 uintx count = 0;
234 while (Atomic::cmpxchg(1, &JNIHistogram_lock, 0) != 0) {
235 while (OrderAccess::load_acquire(&JNIHistogram_lock) != 0) {
236 count +=1;
237 if ( (WarnOnStalledSpinLock > 0)
238 && (count % WarnOnStalledSpinLock == 0)) {
239 warning("JNIHistogram_lock seems to be stalled");
240 }
241 }
242 }
245 if(JNIHistogram == NULL)
246 JNIHistogram = new Histogram("JNI Call Counts",100);
248 JNIHistogram->add_element(this);
249 Atomic::dec(&JNIHistogram_lock);
250 }
252 #define JNICountWrapper(arg) \
253 static JNIHistogramElement* e = new JNIHistogramElement(arg); \
254 /* There is a MT-race condition in VC++. So we need to make sure that that e has been initialized */ \
255 if (e != NULL) e->increment_count()
256 #define JNIWrapper(arg) JNICountWrapper(arg); JNITraceWrapper(arg)
257 #else
258 #define JNIWrapper(arg)
259 #endif
262 // Implementation of JNI entries
264 DT_RETURN_MARK_DECL(DefineClass, jclass);
266 JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef,
267 const jbyte *buf, jsize bufLen))
268 JNIWrapper("DefineClass");
270 DTRACE_PROBE5(hotspot_jni, DefineClass__entry,
271 env, name, loaderRef, buf, bufLen);
272 jclass cls = NULL;
273 DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls);
275 // Since exceptions can be thrown, class initialization can take place
276 // if name is NULL no check for class name in .class stream has to be made.
277 symbolHandle class_name;
278 if (name != NULL) {
279 const int str_len = (int)strlen(name);
280 if (str_len > symbolOopDesc::max_length()) {
281 // It's impossible to create this class; the name cannot fit
282 // into the constant pool.
283 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
284 }
285 class_name = oopFactory::new_symbol_handle(name, str_len, CHECK_NULL);
286 }
288 ResourceMark rm(THREAD);
289 ClassFileStream st((u1*) buf, bufLen, NULL);
290 Handle class_loader (THREAD, JNIHandles::resolve(loaderRef));
292 if (UsePerfData && !class_loader.is_null()) {
293 // check whether the current caller thread holds the lock or not.
294 // If not, increment the corresponding counter
295 if (ObjectSynchronizer::
296 query_lock_ownership((JavaThread*)THREAD, class_loader) !=
297 ObjectSynchronizer::owner_self) {
298 ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc();
299 }
300 }
301 klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
302 Handle(), &st, true,
303 CHECK_NULL);
305 if (TraceClassResolution && k != NULL) {
306 trace_class_resolution(k);
307 }
309 cls = (jclass)JNIHandles::make_local(
310 env, Klass::cast(k)->java_mirror());
311 return cls;
312 JNI_END
316 static bool first_time_FindClass = true;
318 DT_RETURN_MARK_DECL(FindClass, jclass);
320 JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name))
321 JNIWrapper("FindClass");
322 DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name);
324 jclass result = NULL;
325 DT_RETURN_MARK(FindClass, jclass, (const jclass&)result);
327 // Remember if we are the first invocation of jni_FindClass
328 bool first_time = first_time_FindClass;
329 first_time_FindClass = false;
331 // Sanity check the name: it cannot be null or larger than the maximum size
332 // name we can fit in the constant pool.
333 if (name == NULL || (int)strlen(name) > symbolOopDesc::max_length()) {
334 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
335 }
337 //%note jni_3
338 Handle loader;
339 Handle protection_domain;
340 // Find calling class
341 instanceKlassHandle k (THREAD, thread->security_get_caller_class(0));
342 if (k.not_null()) {
343 loader = Handle(THREAD, k->class_loader());
344 // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed
345 // in the correct class context.
346 if (loader.is_null() &&
347 k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
348 JavaValue result(T_OBJECT);
349 JavaCalls::call_static(&result, k,
350 vmSymbolHandles::getFromClass_name(),
351 vmSymbolHandles::void_class_signature(),
352 thread);
353 if (HAS_PENDING_EXCEPTION) {
354 Handle ex(thread, thread->pending_exception());
355 CLEAR_PENDING_EXCEPTION;
356 THROW_HANDLE_0(ex);
357 }
358 oop mirror = (oop) result.get_jobject();
359 loader = Handle(THREAD,
360 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader());
361 protection_domain = Handle(THREAD,
362 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain());
363 }
364 } else {
365 // We call ClassLoader.getSystemClassLoader to obtain the system class loader.
366 loader = Handle(THREAD, SystemDictionary::java_system_loader());
367 }
369 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
370 result = find_class_from_class_loader(env, sym, true, loader,
371 protection_domain, true, thread);
373 if (TraceClassResolution && result != NULL) {
374 trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
375 }
377 // If we were the first invocation of jni_FindClass, we enable compilation again
378 // rather than just allowing invocation counter to overflow and decay.
379 // Controlled by flag DelayCompilationDuringStartup.
380 if (first_time && !CompileTheWorld)
381 CompilationPolicy::completed_vm_startup();
383 return result;
384 JNI_END
386 DT_RETURN_MARK_DECL(FromReflectedMethod, jmethodID);
388 JNI_ENTRY(jmethodID, jni_FromReflectedMethod(JNIEnv *env, jobject method))
389 JNIWrapper("FromReflectedMethod");
390 DTRACE_PROBE2(hotspot_jni, FromReflectedMethod__entry, env, method);
391 jmethodID ret = NULL;
392 DT_RETURN_MARK(FromReflectedMethod, jmethodID, (const jmethodID&)ret);
394 // method is a handle to a java.lang.reflect.Method object
395 oop reflected = JNIHandles::resolve_non_null(method);
396 oop mirror = NULL;
397 int slot = 0;
399 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
400 mirror = java_lang_reflect_Constructor::clazz(reflected);
401 slot = java_lang_reflect_Constructor::slot(reflected);
402 } else {
403 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), "wrong type");
404 mirror = java_lang_reflect_Method::clazz(reflected);
405 slot = java_lang_reflect_Method::slot(reflected);
406 }
407 klassOop k = java_lang_Class::as_klassOop(mirror);
409 KlassHandle k1(THREAD, k);
410 // Make sure class is initialized before handing id's out to methods
411 Klass::cast(k1())->initialize(CHECK_NULL);
412 methodOop m = instanceKlass::cast(k1())->method_with_idnum(slot);
413 ret = m==NULL? NULL : m->jmethod_id(); // return NULL if reflected method deleted
414 return ret;
415 JNI_END
417 DT_RETURN_MARK_DECL(FromReflectedField, jfieldID);
419 JNI_ENTRY(jfieldID, jni_FromReflectedField(JNIEnv *env, jobject field))
420 JNIWrapper("FromReflectedField");
421 DTRACE_PROBE2(hotspot_jni, FromReflectedField__entry, env, field);
422 jfieldID ret = NULL;
423 DT_RETURN_MARK(FromReflectedField, jfieldID, (const jfieldID&)ret);
425 // field is a handle to a java.lang.reflect.Field object
426 oop reflected = JNIHandles::resolve_non_null(field);
427 oop mirror = java_lang_reflect_Field::clazz(reflected);
428 klassOop k = java_lang_Class::as_klassOop(mirror);
429 int slot = java_lang_reflect_Field::slot(reflected);
430 int modifiers = java_lang_reflect_Field::modifiers(reflected);
432 KlassHandle k1(THREAD, k);
433 // Make sure class is initialized before handing id's out to fields
434 Klass::cast(k1())->initialize(CHECK_NULL);
436 // First check if this is a static field
437 if (modifiers & JVM_ACC_STATIC) {
438 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
439 JNIid* id = instanceKlass::cast(k1())->jni_id_for(offset);
440 assert(id != NULL, "corrupt Field object");
441 debug_only(id->set_is_static_field_id();)
442 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
443 ret = jfieldIDWorkaround::to_static_jfieldID(id);
444 return ret;
445 }
447 // The slot is the index of the field description in the field-array
448 // The jfieldID is the offset of the field within the object
449 // It may also have hash bits for k, if VerifyJNIFields is turned on.
450 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
451 assert(instanceKlass::cast(k1())->contains_field_offset(offset), "stay within object");
452 ret = jfieldIDWorkaround::to_instance_jfieldID(k1(), offset);
453 return ret;
454 JNI_END
456 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject);
458 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
459 JNIWrapper("ToReflectedMethod");
460 DTRACE_PROBE4(hotspot_jni, ToReflectedMethod__entry, env, cls, method_id, isStatic);
461 jobject ret = NULL;
462 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
464 methodHandle m (THREAD, JNIHandles::resolve_jmethod_id(method_id));
465 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
466 oop reflection_method;
467 if (m->is_initializer()) {
468 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
469 } else {
470 reflection_method = Reflection::new_method(m, UseNewReflection, false, CHECK_NULL);
471 }
472 ret = JNIHandles::make_local(env, reflection_method);
473 return ret;
474 JNI_END
476 DT_RETURN_MARK_DECL(GetSuperclass, jclass);
478 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
479 JNIWrapper("GetSuperclass");
480 DTRACE_PROBE2(hotspot_jni, GetSuperclass__entry, env, sub);
481 jclass obj = NULL;
482 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
484 oop mirror = JNIHandles::resolve_non_null(sub);
485 // primitive classes return NULL
486 if (java_lang_Class::is_primitive(mirror)) return NULL;
488 // Rules of Class.getSuperClass as implemented by KLass::java_super:
489 // arrays return Object
490 // interfaces return NULL
491 // proper classes return Klass::super()
492 klassOop k = java_lang_Class::as_klassOop(mirror);
493 if (Klass::cast(k)->is_interface()) return NULL;
495 // return mirror for superclass
496 klassOop super = Klass::cast(k)->java_super();
497 // super2 is the value computed by the compiler's getSuperClass intrinsic:
498 debug_only(klassOop super2 = ( Klass::cast(k)->oop_is_javaArray()
499 ? SystemDictionary::Object_klass()
500 : Klass::cast(k)->super() ) );
501 assert(super == super2,
502 "java_super computation depends on interface, array, other super");
503 obj = (super == NULL) ? NULL : (jclass) JNIHandles::make_local(Klass::cast(super)->java_mirror());
504 return obj;
505 JNI_END
507 JNI_QUICK_ENTRY(jboolean, jni_IsAssignableFrom(JNIEnv *env, jclass sub, jclass super))
508 JNIWrapper("IsSubclassOf");
509 DTRACE_PROBE3(hotspot_jni, IsAssignableFrom__entry, env, sub, super);
510 oop sub_mirror = JNIHandles::resolve_non_null(sub);
511 oop super_mirror = JNIHandles::resolve_non_null(super);
512 if (java_lang_Class::is_primitive(sub_mirror) ||
513 java_lang_Class::is_primitive(super_mirror)) {
514 jboolean ret = (sub_mirror == super_mirror);
515 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
516 return ret;
517 }
518 klassOop sub_klass = java_lang_Class::as_klassOop(sub_mirror);
519 klassOop super_klass = java_lang_Class::as_klassOop(super_mirror);
520 assert(sub_klass != NULL && super_klass != NULL, "invalid arguments to jni_IsAssignableFrom");
521 jboolean ret = Klass::cast(sub_klass)->is_subtype_of(super_klass) ?
522 JNI_TRUE : JNI_FALSE;
523 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
524 return ret;
525 JNI_END
527 DT_RETURN_MARK_DECL(Throw, jint);
529 JNI_ENTRY(jint, jni_Throw(JNIEnv *env, jthrowable obj))
530 JNIWrapper("Throw");
531 DTRACE_PROBE2(hotspot_jni, Throw__entry, env, obj);
532 jint ret = JNI_OK;
533 DT_RETURN_MARK(Throw, jint, (const jint&)ret);
535 THROW_OOP_(JNIHandles::resolve(obj), JNI_OK);
536 ShouldNotReachHere();
537 JNI_END
539 DT_RETURN_MARK_DECL(ThrowNew, jint);
541 JNI_ENTRY(jint, jni_ThrowNew(JNIEnv *env, jclass clazz, const char *message))
542 JNIWrapper("ThrowNew");
543 DTRACE_PROBE3(hotspot_jni, ThrowNew__entry, env, clazz, message);
544 jint ret = JNI_OK;
545 DT_RETURN_MARK(ThrowNew, jint, (const jint&)ret);
547 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
548 symbolHandle name = symbolHandle(THREAD, k->name());
549 Handle class_loader (THREAD, k->class_loader());
550 Handle protection_domain (THREAD, k->protection_domain());
551 THROW_MSG_LOADER_(name, (char *)message, class_loader, protection_domain, JNI_OK);
552 ShouldNotReachHere();
553 JNI_END
556 // JNI functions only transform a pending async exception to a synchronous
557 // exception in ExceptionOccurred and ExceptionCheck calls, since
558 // delivering an async exception in other places won't change the native
559 // code's control flow and would be harmful when native code further calls
560 // JNI functions with a pending exception. Async exception is also checked
561 // during the call, so ExceptionOccurred/ExceptionCheck won't return
562 // false but deliver the async exception at the very end during
563 // state transition.
565 static void jni_check_async_exceptions(JavaThread *thread) {
566 assert(thread == Thread::current(), "must be itself");
567 thread->check_and_handle_async_exceptions();
568 }
570 JNI_ENTRY_NO_PRESERVE(jthrowable, jni_ExceptionOccurred(JNIEnv *env))
571 JNIWrapper("ExceptionOccurred");
572 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__entry, env);
573 jni_check_async_exceptions(thread);
574 oop exception = thread->pending_exception();
575 jthrowable ret = (jthrowable) JNIHandles::make_local(env, exception);
576 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__return, ret);
577 return ret;
578 JNI_END
581 JNI_ENTRY_NO_PRESERVE(void, jni_ExceptionDescribe(JNIEnv *env))
582 JNIWrapper("ExceptionDescribe");
583 DTRACE_PROBE1(hotspot_jni, ExceptionDescribe__entry, env);
584 if (thread->has_pending_exception()) {
585 Handle ex(thread, thread->pending_exception());
586 thread->clear_pending_exception();
587 if (ex->is_a(SystemDictionary::ThreadDeath_klass())) {
588 // Don't print anything if we are being killed.
589 } else {
590 jio_fprintf(defaultStream::error_stream(), "Exception ");
591 if (thread != NULL && thread->threadObj() != NULL) {
592 ResourceMark rm(THREAD);
593 jio_fprintf(defaultStream::error_stream(),
594 "in thread \"%s\" ", thread->get_thread_name());
595 }
596 if (ex->is_a(SystemDictionary::Throwable_klass())) {
597 JavaValue result(T_VOID);
598 JavaCalls::call_virtual(&result,
599 ex,
600 KlassHandle(THREAD,
601 SystemDictionary::Throwable_klass()),
602 vmSymbolHandles::printStackTrace_name(),
603 vmSymbolHandles::void_method_signature(),
604 THREAD);
605 // If an exception is thrown in the call it gets thrown away. Not much
606 // we can do with it. The native code that calls this, does not check
607 // for the exception - hence, it might still be in the thread when DestroyVM gets
608 // called, potentially causing a few asserts to trigger - since no pending exception
609 // is expected.
610 CLEAR_PENDING_EXCEPTION;
611 } else {
612 ResourceMark rm(THREAD);
613 jio_fprintf(defaultStream::error_stream(),
614 ". Uncaught exception of type %s.",
615 Klass::cast(ex->klass())->external_name());
616 }
617 }
618 }
619 DTRACE_PROBE(hotspot_jni, ExceptionDescribe__return);
620 JNI_END
623 JNI_QUICK_ENTRY(void, jni_ExceptionClear(JNIEnv *env))
624 JNIWrapper("ExceptionClear");
625 DTRACE_PROBE1(hotspot_jni, ExceptionClear__entry, env);
627 // The jni code might be using this API to clear java thrown exception.
628 // So just mark jvmti thread exception state as exception caught.
629 JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state();
630 if (state != NULL && state->is_exception_detected()) {
631 state->set_exception_caught();
632 }
633 thread->clear_pending_exception();
634 DTRACE_PROBE(hotspot_jni, ExceptionClear__return);
635 JNI_END
638 JNI_ENTRY(void, jni_FatalError(JNIEnv *env, const char *msg))
639 JNIWrapper("FatalError");
640 DTRACE_PROBE2(hotspot_jni, FatalError__entry, env, msg);
641 tty->print_cr("FATAL ERROR in native method: %s", msg);
642 thread->print_stack();
643 os::abort(); // Dump core and abort
644 JNI_END
647 JNI_ENTRY(jint, jni_PushLocalFrame(JNIEnv *env, jint capacity))
648 JNIWrapper("PushLocalFrame");
649 DTRACE_PROBE2(hotspot_jni, PushLocalFrame__entry, env, capacity);
650 //%note jni_11
651 if (capacity < 0 && capacity > MAX_REASONABLE_LOCAL_CAPACITY) {
652 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, JNI_ERR);
653 return JNI_ERR;
654 }
655 JNIHandleBlock* old_handles = thread->active_handles();
656 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
657 assert(new_handles != NULL, "should not be NULL");
658 new_handles->set_pop_frame_link(old_handles);
659 thread->set_active_handles(new_handles);
660 jint ret = JNI_OK;
661 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, ret);
662 return ret;
663 JNI_END
666 JNI_ENTRY(jobject, jni_PopLocalFrame(JNIEnv *env, jobject result))
667 JNIWrapper("PopLocalFrame");
668 DTRACE_PROBE2(hotspot_jni, PopLocalFrame__entry, env, result);
669 //%note jni_11
670 Handle result_handle(thread, JNIHandles::resolve(result));
671 JNIHandleBlock* old_handles = thread->active_handles();
672 JNIHandleBlock* new_handles = old_handles->pop_frame_link();
673 if (new_handles != NULL) {
674 // As a sanity check we only release the handle blocks if the pop_frame_link is not NULL.
675 // This way code will still work if PopLocalFrame is called without a corresponding
676 // PushLocalFrame call. Note that we set the pop_frame_link to NULL explicitly, otherwise
677 // the release_block call will release the blocks.
678 thread->set_active_handles(new_handles);
679 old_handles->set_pop_frame_link(NULL); // clear link we won't release new_handles below
680 JNIHandleBlock::release_block(old_handles, thread); // may block
681 result = JNIHandles::make_local(thread, result_handle());
682 }
683 DTRACE_PROBE1(hotspot_jni, PopLocalFrame__return, result);
684 return result;
685 JNI_END
688 JNI_ENTRY(jobject, jni_NewGlobalRef(JNIEnv *env, jobject ref))
689 JNIWrapper("NewGlobalRef");
690 DTRACE_PROBE2(hotspot_jni, NewGlobalRef__entry, env, ref);
691 Handle ref_handle(thread, JNIHandles::resolve(ref));
692 jobject ret = JNIHandles::make_global(ref_handle);
693 DTRACE_PROBE1(hotspot_jni, NewGlobalRef__return, ret);
694 return ret;
695 JNI_END
697 // Must be JNI_ENTRY (with HandleMark)
698 JNI_ENTRY_NO_PRESERVE(void, jni_DeleteGlobalRef(JNIEnv *env, jobject ref))
699 JNIWrapper("DeleteGlobalRef");
700 DTRACE_PROBE2(hotspot_jni, DeleteGlobalRef__entry, env, ref);
701 JNIHandles::destroy_global(ref);
702 DTRACE_PROBE(hotspot_jni, DeleteGlobalRef__return);
703 JNI_END
705 JNI_QUICK_ENTRY(void, jni_DeleteLocalRef(JNIEnv *env, jobject obj))
706 JNIWrapper("DeleteLocalRef");
707 DTRACE_PROBE2(hotspot_jni, DeleteLocalRef__entry, env, obj);
708 JNIHandles::destroy_local(obj);
709 DTRACE_PROBE(hotspot_jni, DeleteLocalRef__return);
710 JNI_END
712 JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2))
713 JNIWrapper("IsSameObject");
714 DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2);
715 oop a = JNIHandles::resolve(r1);
716 oop b = JNIHandles::resolve(r2);
717 jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE;
718 DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret);
719 return ret;
720 JNI_END
723 JNI_ENTRY(jobject, jni_NewLocalRef(JNIEnv *env, jobject ref))
724 JNIWrapper("NewLocalRef");
725 DTRACE_PROBE2(hotspot_jni, NewLocalRef__entry, env, ref);
726 jobject ret = JNIHandles::make_local(env, JNIHandles::resolve(ref));
727 DTRACE_PROBE1(hotspot_jni, NewLocalRef__return, ret);
728 return ret;
729 JNI_END
731 JNI_LEAF(jint, jni_EnsureLocalCapacity(JNIEnv *env, jint capacity))
732 JNIWrapper("EnsureLocalCapacity");
733 DTRACE_PROBE2(hotspot_jni, EnsureLocalCapacity__entry, env, capacity);
734 jint ret;
735 if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) {
736 ret = JNI_OK;
737 } else {
738 ret = JNI_ERR;
739 }
740 DTRACE_PROBE1(hotspot_jni, EnsureLocalCapacity__return, ret);
741 return ret;
742 JNI_END
744 // Return the Handle Type
745 JNI_LEAF(jobjectRefType, jni_GetObjectRefType(JNIEnv *env, jobject obj))
746 JNIWrapper("GetObjectRefType");
747 DTRACE_PROBE2(hotspot_jni, GetObjectRefType__entry, env, obj);
748 jobjectRefType ret;
749 if (JNIHandles::is_local_handle(thread, obj) ||
750 JNIHandles::is_frame_handle(thread, obj))
751 ret = JNILocalRefType;
752 else if (JNIHandles::is_global_handle(obj))
753 ret = JNIGlobalRefType;
754 else if (JNIHandles::is_weak_global_handle(obj))
755 ret = JNIWeakGlobalRefType;
756 else
757 ret = JNIInvalidRefType;
758 DTRACE_PROBE1(hotspot_jni, GetObjectRefType__return, ret);
759 return ret;
760 JNI_END
763 class JNI_ArgumentPusher : public SignatureIterator {
764 protected:
765 JavaCallArguments* _arguments;
767 virtual void get_bool () = 0;
768 virtual void get_char () = 0;
769 virtual void get_short () = 0;
770 virtual void get_byte () = 0;
771 virtual void get_int () = 0;
772 virtual void get_long () = 0;
773 virtual void get_float () = 0;
774 virtual void get_double () = 0;
775 virtual void get_object () = 0;
777 JNI_ArgumentPusher(Thread *thread, symbolOop signature)
778 : SignatureIterator(thread, signature) {
779 this->_return_type = T_ILLEGAL;
780 _arguments = NULL;
781 }
783 public:
784 virtual void iterate( uint64_t fingerprint ) = 0;
786 void set_java_argument_object(JavaCallArguments *arguments) { _arguments = arguments; }
788 inline void do_bool() { if (!is_return_type()) get_bool(); }
789 inline void do_char() { if (!is_return_type()) get_char(); }
790 inline void do_short() { if (!is_return_type()) get_short(); }
791 inline void do_byte() { if (!is_return_type()) get_byte(); }
792 inline void do_int() { if (!is_return_type()) get_int(); }
793 inline void do_long() { if (!is_return_type()) get_long(); }
794 inline void do_float() { if (!is_return_type()) get_float(); }
795 inline void do_double() { if (!is_return_type()) get_double(); }
796 inline void do_object(int begin, int end) { if (!is_return_type()) get_object(); }
797 inline void do_array(int begin, int end) { if (!is_return_type()) get_object(); } // do_array uses get_object -- there is no get_array
798 inline void do_void() { }
800 JavaCallArguments* arguments() { return _arguments; }
801 void push_receiver(Handle h) { _arguments->push_oop(h); }
802 };
805 class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher {
806 protected:
807 va_list _ap;
809 inline void get_bool() { _arguments->push_int(va_arg(_ap, jint)); } // bool is coerced to int when using va_arg
810 inline void get_char() { _arguments->push_int(va_arg(_ap, jint)); } // char is coerced to int when using va_arg
811 inline void get_short() { _arguments->push_int(va_arg(_ap, jint)); } // short is coerced to int when using va_arg
812 inline void get_byte() { _arguments->push_int(va_arg(_ap, jint)); } // byte is coerced to int when using va_arg
813 inline void get_int() { _arguments->push_int(va_arg(_ap, jint)); }
815 // each of these paths is exercized by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
817 inline void get_long() { _arguments->push_long(va_arg(_ap, jlong)); }
818 inline void get_float() { _arguments->push_float((jfloat)va_arg(_ap, jdouble)); } // float is coerced to double w/ va_arg
819 inline void get_double() { _arguments->push_double(va_arg(_ap, jdouble)); }
820 inline void get_object() { jobject l = va_arg(_ap, jobject);
821 _arguments->push_oop(Handle((oop *)l, false)); }
823 inline void set_ap(va_list rap) {
824 #ifdef va_copy
825 va_copy(_ap, rap);
826 #elif defined (__va_copy)
827 __va_copy(_ap, rap);
828 #else
829 _ap = rap;
830 #endif
831 }
833 public:
834 JNI_ArgumentPusherVaArg(Thread *thread, symbolOop signature, va_list rap)
835 : JNI_ArgumentPusher(thread, signature) {
836 set_ap(rap);
837 }
838 JNI_ArgumentPusherVaArg(Thread *thread, jmethodID method_id, va_list rap)
839 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
840 set_ap(rap);
841 }
843 // Optimized path if we have the bitvector form of signature
844 void iterate( uint64_t fingerprint ) {
845 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate();// Must be too many arguments
846 else {
847 _return_type = (BasicType)((fingerprint >> static_feature_size) &
848 result_feature_mask);
850 assert(fingerprint, "Fingerprint should not be 0");
851 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
852 while ( 1 ) {
853 switch ( fingerprint & parameter_feature_mask ) {
854 case bool_parm:
855 case char_parm:
856 case short_parm:
857 case byte_parm:
858 case int_parm:
859 get_int();
860 break;
861 case obj_parm:
862 get_object();
863 break;
864 case long_parm:
865 get_long();
866 break;
867 case float_parm:
868 get_float();
869 break;
870 case double_parm:
871 get_double();
872 break;
873 case done_parm:
874 return;
875 break;
876 default:
877 ShouldNotReachHere();
878 break;
879 }
880 fingerprint >>= parameter_feature_size;
881 }
882 }
883 }
884 };
887 class JNI_ArgumentPusherArray : public JNI_ArgumentPusher {
888 protected:
889 const jvalue *_ap;
891 inline void get_bool() { _arguments->push_int((jint)(_ap++)->z); }
892 inline void get_char() { _arguments->push_int((jint)(_ap++)->c); }
893 inline void get_short() { _arguments->push_int((jint)(_ap++)->s); }
894 inline void get_byte() { _arguments->push_int((jint)(_ap++)->b); }
895 inline void get_int() { _arguments->push_int((jint)(_ap++)->i); }
897 inline void get_long() { _arguments->push_long((_ap++)->j); }
898 inline void get_float() { _arguments->push_float((_ap++)->f); }
899 inline void get_double() { _arguments->push_double((_ap++)->d);}
900 inline void get_object() { _arguments->push_oop(Handle((oop *)(_ap++)->l, false)); }
902 inline void set_ap(const jvalue *rap) { _ap = rap; }
904 public:
905 JNI_ArgumentPusherArray(Thread *thread, symbolOop signature, const jvalue *rap)
906 : JNI_ArgumentPusher(thread, signature) {
907 set_ap(rap);
908 }
909 JNI_ArgumentPusherArray(Thread *thread, jmethodID method_id, const jvalue *rap)
910 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
911 set_ap(rap);
912 }
914 // Optimized path if we have the bitvector form of signature
915 void iterate( uint64_t fingerprint ) {
916 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate(); // Must be too many arguments
917 else {
918 _return_type = (BasicType)((fingerprint >> static_feature_size) &
919 result_feature_mask);
920 assert(fingerprint, "Fingerprint should not be 0");
921 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
922 while ( 1 ) {
923 switch ( fingerprint & parameter_feature_mask ) {
924 case bool_parm:
925 get_bool();
926 break;
927 case char_parm:
928 get_char();
929 break;
930 case short_parm:
931 get_short();
932 break;
933 case byte_parm:
934 get_byte();
935 break;
936 case int_parm:
937 get_int();
938 break;
939 case obj_parm:
940 get_object();
941 break;
942 case long_parm:
943 get_long();
944 break;
945 case float_parm:
946 get_float();
947 break;
948 case double_parm:
949 get_double();
950 break;
951 case done_parm:
952 return;
953 break;
954 default:
955 ShouldNotReachHere();
956 break;
957 }
958 fingerprint >>= parameter_feature_size;
959 }
960 }
961 }
962 };
965 enum JNICallType {
966 JNI_STATIC,
967 JNI_VIRTUAL,
968 JNI_NONVIRTUAL
969 };
971 static methodHandle jni_resolve_interface_call(Handle recv, methodHandle method, TRAPS) {
972 assert(!method.is_null() , "method should not be null");
974 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
975 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
976 KlassHandle spec_klass (THREAD, method->method_holder());
977 symbolHandle name (THREAD, method->name());
978 symbolHandle signature (THREAD, method->signature());
979 CallInfo info;
980 LinkResolver::resolve_interface_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
981 return info.selected_method();
982 }
984 static methodHandle jni_resolve_virtual_call(Handle recv, methodHandle method, TRAPS) {
985 assert(!method.is_null() , "method should not be null");
987 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
988 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
989 KlassHandle spec_klass (THREAD, method->method_holder());
990 symbolHandle name (THREAD, method->name());
991 symbolHandle signature (THREAD, method->signature());
992 CallInfo info;
993 LinkResolver::resolve_virtual_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
994 return info.selected_method();
995 }
999 static void jni_invoke_static(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
1000 methodHandle method(THREAD, JNIHandles::resolve_jmethod_id(method_id));
1002 // Create object to hold arguments for the JavaCall, and associate it with
1003 // the jni parser
1004 ResourceMark rm(THREAD);
1005 int number_of_parameters = method->size_of_parameters();
1006 JavaCallArguments java_args(number_of_parameters);
1007 args->set_java_argument_object(&java_args);
1009 assert(method->is_static(), "method should be static");
1011 // Fill out JavaCallArguments object
1012 args->iterate( Fingerprinter(THREAD, method).fingerprint() );
1013 // Initialize result type
1014 result->set_type(args->get_ret_type());
1016 // Invoke the method. Result is returned as oop.
1017 JavaCalls::call(result, method, &java_args, CHECK);
1019 // Convert result
1020 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1021 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1022 }
1023 }
1026 static void jni_invoke_nonstatic(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
1027 oop recv = JNIHandles::resolve(receiver);
1028 if (recv == NULL) {
1029 THROW(vmSymbols::java_lang_NullPointerException());
1030 }
1031 Handle h_recv(THREAD, recv);
1033 int number_of_parameters;
1034 methodOop selected_method;
1035 {
1036 methodOop m = JNIHandles::resolve_jmethod_id(method_id);
1037 number_of_parameters = m->size_of_parameters();
1038 klassOop holder = m->method_holder();
1039 if (!(Klass::cast(holder))->is_interface()) {
1040 // non-interface call -- for that little speed boost, don't handlize
1041 debug_only(No_Safepoint_Verifier nosafepoint;)
1042 if (call_type == JNI_VIRTUAL) {
1043 // jni_GetMethodID makes sure class is linked and initialized
1044 // so m should have a valid vtable index.
1045 int vtbl_index = m->vtable_index();
1046 if (vtbl_index != methodOopDesc::nonvirtual_vtable_index) {
1047 klassOop k = h_recv->klass();
1048 // k might be an arrayKlassOop but all vtables start at
1049 // the same place. The cast is to avoid virtual call and assertion.
1050 instanceKlass *ik = (instanceKlass*)k->klass_part();
1051 selected_method = ik->method_at_vtable(vtbl_index);
1052 } else {
1053 // final method
1054 selected_method = m;
1055 }
1056 } else {
1057 // JNI_NONVIRTUAL call
1058 selected_method = m;
1059 }
1060 } else {
1061 // interface call
1062 KlassHandle h_holder(THREAD, holder);
1064 int itbl_index = m->cached_itable_index();
1065 if (itbl_index == -1) {
1066 itbl_index = klassItable::compute_itable_index(m);
1067 m->set_cached_itable_index(itbl_index);
1068 // the above may have grabbed a lock, 'm' and anything non-handlized can't be used again
1069 }
1070 klassOop k = h_recv->klass();
1071 selected_method = instanceKlass::cast(k)->method_at_itable(h_holder(), itbl_index, CHECK);
1072 }
1073 }
1075 methodHandle method(THREAD, selected_method);
1077 // Create object to hold arguments for the JavaCall, and associate it with
1078 // the jni parser
1079 ResourceMark rm(THREAD);
1080 JavaCallArguments java_args(number_of_parameters);
1081 args->set_java_argument_object(&java_args);
1083 // handle arguments
1084 assert(!method->is_static(), "method should not be static");
1085 args->push_receiver(h_recv); // Push jobject handle
1087 // Fill out JavaCallArguments object
1088 args->iterate( Fingerprinter(THREAD, method).fingerprint() );
1089 // Initialize result type
1090 result->set_type(args->get_ret_type());
1092 // Invoke the method. Result is returned as oop.
1093 JavaCalls::call(result, method, &java_args, CHECK);
1095 // Convert result
1096 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1097 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1098 }
1099 }
1102 static instanceOop alloc_object(jclass clazz, TRAPS) {
1103 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1104 Klass::cast(k())->check_valid_for_instantiation(false, CHECK_NULL);
1105 instanceKlass::cast(k())->initialize(CHECK_NULL);
1106 instanceOop ih = instanceKlass::cast(k())->allocate_instance(THREAD);
1107 return ih;
1108 }
1110 DT_RETURN_MARK_DECL(AllocObject, jobject);
1112 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
1113 JNIWrapper("AllocObject");
1115 DTRACE_PROBE2(hotspot_jni, AllocObject__entry, env, clazz);
1116 jobject ret = NULL;
1117 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
1119 instanceOop i = alloc_object(clazz, CHECK_NULL);
1120 ret = JNIHandles::make_local(env, i);
1121 return ret;
1122 JNI_END
1124 DT_RETURN_MARK_DECL(NewObjectA, jobject);
1126 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
1127 JNIWrapper("NewObjectA");
1128 DTRACE_PROBE3(hotspot_jni, NewObjectA__entry, env, clazz, methodID);
1129 jobject obj = NULL;
1130 DT_RETURN_MARK(NewObjectA, jobject, (const jobject)obj);
1132 instanceOop i = alloc_object(clazz, CHECK_NULL);
1133 obj = JNIHandles::make_local(env, i);
1134 JavaValue jvalue(T_VOID);
1135 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1136 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1137 return obj;
1138 JNI_END
1140 DT_RETURN_MARK_DECL(NewObjectV, jobject);
1142 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
1143 JNIWrapper("NewObjectV");
1144 DTRACE_PROBE3(hotspot_jni, NewObjectV__entry, env, clazz, methodID);
1145 jobject obj = NULL;
1146 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
1148 instanceOop i = alloc_object(clazz, CHECK_NULL);
1149 obj = JNIHandles::make_local(env, i);
1150 JavaValue jvalue(T_VOID);
1151 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1152 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1153 return obj;
1154 JNI_END
1156 DT_RETURN_MARK_DECL(NewObject, jobject);
1158 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1159 JNIWrapper("NewObject");
1160 DTRACE_PROBE3(hotspot_jni, NewObject__entry, env, clazz, methodID);
1161 jobject obj = NULL;
1162 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1164 instanceOop i = alloc_object(clazz, CHECK_NULL);
1165 obj = JNIHandles::make_local(env, i);
1166 va_list args;
1167 va_start(args, methodID);
1168 JavaValue jvalue(T_VOID);
1169 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1170 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1171 va_end(args);
1172 return obj;
1173 JNI_END
1176 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1177 JNIWrapper("GetObjectClass");
1178 DTRACE_PROBE2(hotspot_jni, GetObjectClass__entry, env, obj);
1179 klassOop k = JNIHandles::resolve_non_null(obj)->klass();
1180 jclass ret =
1181 (jclass) JNIHandles::make_local(env, Klass::cast(k)->java_mirror());
1182 DTRACE_PROBE1(hotspot_jni, GetObjectClass__return, ret);
1183 return ret;
1184 JNI_END
1186 JNI_QUICK_ENTRY(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1187 JNIWrapper("IsInstanceOf");
1188 DTRACE_PROBE3(hotspot_jni, IsInstanceOf__entry, env, obj, clazz);
1189 jboolean ret = JNI_TRUE;
1190 if (obj != NULL) {
1191 ret = JNI_FALSE;
1192 klassOop k = java_lang_Class::as_klassOop(
1193 JNIHandles::resolve_non_null(clazz));
1194 if (k != NULL) {
1195 ret = JNIHandles::resolve_non_null(obj)->is_a(k) ? JNI_TRUE : JNI_FALSE;
1196 }
1197 }
1198 DTRACE_PROBE1(hotspot_jni, IsInstanceOf__return, ret);
1199 return ret;
1200 JNI_END
1203 static jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name_str,
1204 const char *sig, bool is_static, TRAPS) {
1205 // %%%% This code should probably just call into a method in the LinkResolver
1206 //
1207 // The class should have been loaded (we have an instance of the class
1208 // passed in) so the method and signature should already be in the symbol
1209 // table. If they're not there, the method doesn't exist.
1210 symbolHandle signature =
1211 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1212 symbolHandle name;
1213 if (name_str == NULL) {
1214 name = vmSymbolHandles::object_initializer_name();
1215 } else {
1216 name = symbolHandle(THREAD,
1217 SymbolTable::probe(name_str, (int)strlen(name_str)));
1218 }
1219 if (name.is_null() || signature.is_null()) {
1220 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1221 }
1223 // Throw a NoSuchMethodError exception if we have an instance of a
1224 // primitive java.lang.Class
1225 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(clazz))) {
1226 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1227 }
1229 KlassHandle klass(THREAD,
1230 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1232 // Make sure class is linked and initialized before handing id's out to
1233 // methodOops.
1234 Klass::cast(klass())->initialize(CHECK_NULL);
1236 methodOop m;
1237 if (name() == vmSymbols::object_initializer_name() ||
1238 name() == vmSymbols::class_initializer_name()) {
1239 // Never search superclasses for constructors
1240 if (klass->oop_is_instance()) {
1241 m = instanceKlass::cast(klass())->find_method(name(), signature());
1242 } else {
1243 m = NULL;
1244 }
1245 } else {
1246 m = klass->lookup_method(name(), signature());
1247 // Look up interfaces
1248 if (m == NULL && klass->oop_is_instance()) {
1249 m = instanceKlass::cast(klass())->lookup_method_in_all_interfaces(name(),
1250 signature());
1251 }
1252 }
1253 if (m == NULL || (m->is_static() != is_static)) {
1254 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1255 }
1256 return m->jmethod_id();
1257 }
1260 JNI_ENTRY(jmethodID, jni_GetMethodID(JNIEnv *env, jclass clazz,
1261 const char *name, const char *sig))
1262 JNIWrapper("GetMethodID");
1263 DTRACE_PROBE4(hotspot_jni, GetMethodID__entry, env, clazz, name, sig);
1264 jmethodID ret = get_method_id(env, clazz, name, sig, false, thread);
1265 DTRACE_PROBE1(hotspot_jni, GetMethodID__return, ret);
1266 return ret;
1267 JNI_END
1270 JNI_ENTRY(jmethodID, jni_GetStaticMethodID(JNIEnv *env, jclass clazz,
1271 const char *name, const char *sig))
1272 JNIWrapper("GetStaticMethodID");
1273 DTRACE_PROBE4(hotspot_jni, GetStaticMethodID__entry, env, clazz, name, sig);
1274 jmethodID ret = get_method_id(env, clazz, name, sig, true, thread);
1275 DTRACE_PROBE1(hotspot_jni, GetStaticMethodID__return, ret);
1276 return ret;
1277 JNI_END
1281 //
1282 // Calling Methods
1283 //
1286 #define DEFINE_CALLMETHOD(ResultType, Result, Tag) \
1287 \
1288 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##Method, ResultType);\
1289 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodV, ResultType);\
1290 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodA, ResultType);\
1291 \
1292 JNI_ENTRY(ResultType, \
1293 jni_Call##Result##Method(JNIEnv *env, jobject obj, jmethodID methodID, ...)) \
1294 JNIWrapper("Call" XSTR(Result) "Method"); \
1295 \
1296 DTRACE_PROBE3(hotspot_jni, Call##Result##Method__entry, env, obj, methodID);\
1297 ResultType ret = 0;\
1298 DT_RETURN_MARK_FOR(Result, Call##Result##Method, ResultType, \
1299 (const ResultType&)ret);\
1300 \
1301 va_list args; \
1302 va_start(args, methodID); \
1303 JavaValue jvalue(Tag); \
1304 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1305 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1306 va_end(args); \
1307 ret = jvalue.get_##ResultType(); \
1308 return ret;\
1309 JNI_END \
1310 \
1311 \
1312 JNI_ENTRY(ResultType, \
1313 jni_Call##Result##MethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) \
1314 JNIWrapper("Call" XSTR(Result) "MethodV"); \
1315 \
1316 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodV__entry, env, obj, methodID);\
1317 ResultType ret = 0;\
1318 DT_RETURN_MARK_FOR(Result, Call##Result##MethodV, ResultType, \
1319 (const ResultType&)ret);\
1320 \
1321 JavaValue jvalue(Tag); \
1322 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1323 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1324 ret = jvalue.get_##ResultType(); \
1325 return ret;\
1326 JNI_END \
1327 \
1328 \
1329 JNI_ENTRY(ResultType, \
1330 jni_Call##Result##MethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) \
1331 JNIWrapper("Call" XSTR(Result) "MethodA"); \
1332 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodA__entry, env, obj, methodID);\
1333 ResultType ret = 0;\
1334 DT_RETURN_MARK_FOR(Result, Call##Result##MethodA, ResultType, \
1335 (const ResultType&)ret);\
1336 \
1337 JavaValue jvalue(Tag); \
1338 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1339 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1340 ret = jvalue.get_##ResultType(); \
1341 return ret;\
1342 JNI_END
1344 // the runtime type of subword integral basic types is integer
1345 DEFINE_CALLMETHOD(jboolean, Boolean, T_BOOLEAN)
1346 DEFINE_CALLMETHOD(jbyte, Byte, T_BYTE)
1347 DEFINE_CALLMETHOD(jchar, Char, T_CHAR)
1348 DEFINE_CALLMETHOD(jshort, Short, T_SHORT)
1350 DEFINE_CALLMETHOD(jobject, Object, T_OBJECT)
1351 DEFINE_CALLMETHOD(jint, Int, T_INT)
1352 DEFINE_CALLMETHOD(jlong, Long, T_LONG)
1353 DEFINE_CALLMETHOD(jfloat, Float, T_FLOAT)
1354 DEFINE_CALLMETHOD(jdouble, Double, T_DOUBLE)
1356 DT_VOID_RETURN_MARK_DECL(CallVoidMethod);
1357 DT_VOID_RETURN_MARK_DECL(CallVoidMethodV);
1358 DT_VOID_RETURN_MARK_DECL(CallVoidMethodA);
1360 JNI_ENTRY(void, jni_CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...))
1361 JNIWrapper("CallVoidMethod");
1362 DTRACE_PROBE3(hotspot_jni, CallVoidMethod__entry, env, obj, methodID);
1363 DT_VOID_RETURN_MARK(CallVoidMethod);
1365 va_list args;
1366 va_start(args, methodID);
1367 JavaValue jvalue(T_VOID);
1368 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1369 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1370 va_end(args);
1371 JNI_END
1374 JNI_ENTRY(void, jni_CallVoidMethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args))
1375 JNIWrapper("CallVoidMethodV");
1376 DTRACE_PROBE3(hotspot_jni, CallVoidMethodV__entry, env, obj, methodID);
1377 DT_VOID_RETURN_MARK(CallVoidMethodV);
1379 JavaValue jvalue(T_VOID);
1380 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1381 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1382 JNI_END
1385 JNI_ENTRY(void, jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args))
1386 JNIWrapper("CallVoidMethodA");
1387 DTRACE_PROBE3(hotspot_jni, CallVoidMethodA__entry, env, obj, methodID);
1388 DT_VOID_RETURN_MARK(CallVoidMethodA);
1390 JavaValue jvalue(T_VOID);
1391 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1392 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1393 JNI_END
1396 #define DEFINE_CALLNONVIRTUALMETHOD(ResultType, Result, Tag) \
1397 \
1398 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##Method, ResultType);\
1399 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodV, ResultType);\
1400 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodA, ResultType);\
1401 \
1402 JNI_ENTRY(ResultType, \
1403 jni_CallNonvirtual##Result##Method(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) \
1404 JNIWrapper("CallNonvitual" XSTR(Result) "Method"); \
1405 \
1406 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##Method__entry, env, obj, cls, methodID);\
1407 ResultType ret;\
1408 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##Method, ResultType, \
1409 (const ResultType&)ret);\
1410 \
1411 va_list args; \
1412 va_start(args, methodID); \
1413 JavaValue jvalue(Tag); \
1414 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1415 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1416 va_end(args); \
1417 ret = jvalue.get_##ResultType(); \
1418 return ret;\
1419 JNI_END \
1420 \
1421 JNI_ENTRY(ResultType, \
1422 jni_CallNonvirtual##Result##MethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) \
1423 JNIWrapper("CallNonvitual" XSTR(Result) "#MethodV"); \
1424 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodV__entry, env, obj, cls, methodID);\
1425 ResultType ret;\
1426 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodV, ResultType, \
1427 (const ResultType&)ret);\
1428 \
1429 JavaValue jvalue(Tag); \
1430 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1431 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1432 ret = jvalue.get_##ResultType(); \
1433 return ret;\
1434 JNI_END \
1435 \
1436 JNI_ENTRY(ResultType, \
1437 jni_CallNonvirtual##Result##MethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) \
1438 JNIWrapper("CallNonvitual" XSTR(Result) "MethodA"); \
1439 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodA__entry, env, obj, cls, methodID);\
1440 ResultType ret;\
1441 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodA, ResultType, \
1442 (const ResultType&)ret);\
1443 \
1444 JavaValue jvalue(Tag); \
1445 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1446 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1447 ret = jvalue.get_##ResultType(); \
1448 return ret;\
1449 JNI_END
1451 // the runtime type of subword integral basic types is integer
1452 DEFINE_CALLNONVIRTUALMETHOD(jboolean, Boolean, T_BOOLEAN)
1453 DEFINE_CALLNONVIRTUALMETHOD(jbyte, Byte, T_BYTE)
1454 DEFINE_CALLNONVIRTUALMETHOD(jchar, Char, T_CHAR)
1455 DEFINE_CALLNONVIRTUALMETHOD(jshort, Short, T_SHORT)
1457 DEFINE_CALLNONVIRTUALMETHOD(jobject, Object, T_OBJECT)
1458 DEFINE_CALLNONVIRTUALMETHOD(jint, Int, T_INT)
1459 DEFINE_CALLNONVIRTUALMETHOD(jlong, Long, T_LONG)
1460 DEFINE_CALLNONVIRTUALMETHOD(jfloat, Float, T_FLOAT)
1461 DEFINE_CALLNONVIRTUALMETHOD(jdouble, Double, T_DOUBLE)
1464 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethod);
1465 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodV);
1466 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodA);
1468 JNI_ENTRY(void, jni_CallNonvirtualVoidMethod(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...))
1469 JNIWrapper("CallNonvirtualVoidMethod");
1471 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethod__entry,
1472 env, obj, cls, methodID);
1473 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethod);
1475 va_list args;
1476 va_start(args, methodID);
1477 JavaValue jvalue(T_VOID);
1478 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1479 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1480 va_end(args);
1481 JNI_END
1484 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args))
1485 JNIWrapper("CallNonvirtualVoidMethodV");
1487 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodV__entry,
1488 env, obj, cls, methodID);
1489 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodV);
1491 JavaValue jvalue(T_VOID);
1492 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1493 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1494 JNI_END
1497 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args))
1498 JNIWrapper("CallNonvirtualVoidMethodA");
1499 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodA__entry,
1500 env, obj, cls, methodID);
1501 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodA);
1502 JavaValue jvalue(T_VOID);
1503 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1504 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1505 JNI_END
1508 #define DEFINE_CALLSTATICMETHOD(ResultType, Result, Tag) \
1509 \
1510 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##Method, ResultType);\
1511 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodV, ResultType);\
1512 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodA, ResultType);\
1513 \
1514 JNI_ENTRY(ResultType, \
1515 jni_CallStatic##Result##Method(JNIEnv *env, jclass cls, jmethodID methodID, ...)) \
1516 JNIWrapper("CallStatic" XSTR(Result) "Method"); \
1517 \
1518 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##Method__entry, env, cls, methodID);\
1519 ResultType ret = 0;\
1520 DT_RETURN_MARK_FOR(Result, CallStatic##Result##Method, ResultType, \
1521 (const ResultType&)ret);\
1522 \
1523 va_list args; \
1524 va_start(args, methodID); \
1525 JavaValue jvalue(Tag); \
1526 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1527 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1528 va_end(args); \
1529 ret = jvalue.get_##ResultType(); \
1530 return ret;\
1531 JNI_END \
1532 \
1533 JNI_ENTRY(ResultType, \
1534 jni_CallStatic##Result##MethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) \
1535 JNIWrapper("CallStatic" XSTR(Result) "MethodV"); \
1536 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodV__entry, env, cls, methodID);\
1537 ResultType ret = 0;\
1538 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodV, ResultType, \
1539 (const ResultType&)ret);\
1540 \
1541 JavaValue jvalue(Tag); \
1542 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1543 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1544 ret = jvalue.get_##ResultType(); \
1545 return ret;\
1546 JNI_END \
1547 \
1548 JNI_ENTRY(ResultType, \
1549 jni_CallStatic##Result##MethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) \
1550 JNIWrapper("CallStatic" XSTR(Result) "MethodA"); \
1551 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodA__entry, env, cls, methodID);\
1552 ResultType ret = 0;\
1553 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodA, ResultType, \
1554 (const ResultType&)ret);\
1555 \
1556 JavaValue jvalue(Tag); \
1557 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1558 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1559 ret = jvalue.get_##ResultType(); \
1560 return ret;\
1561 JNI_END
1563 // the runtime type of subword integral basic types is integer
1564 DEFINE_CALLSTATICMETHOD(jboolean, Boolean, T_BOOLEAN)
1565 DEFINE_CALLSTATICMETHOD(jbyte, Byte, T_BYTE)
1566 DEFINE_CALLSTATICMETHOD(jchar, Char, T_CHAR)
1567 DEFINE_CALLSTATICMETHOD(jshort, Short, T_SHORT)
1569 DEFINE_CALLSTATICMETHOD(jobject, Object, T_OBJECT)
1570 DEFINE_CALLSTATICMETHOD(jint, Int, T_INT)
1571 DEFINE_CALLSTATICMETHOD(jlong, Long, T_LONG)
1572 DEFINE_CALLSTATICMETHOD(jfloat, Float, T_FLOAT)
1573 DEFINE_CALLSTATICMETHOD(jdouble, Double, T_DOUBLE)
1576 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethod);
1577 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodV);
1578 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodA);
1580 JNI_ENTRY(void, jni_CallStaticVoidMethod(JNIEnv *env, jclass cls, jmethodID methodID, ...))
1581 JNIWrapper("CallStaticVoidMethod");
1582 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethod__entry, env, cls, methodID);
1583 DT_VOID_RETURN_MARK(CallStaticVoidMethod);
1585 va_list args;
1586 va_start(args, methodID);
1587 JavaValue jvalue(T_VOID);
1588 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1589 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1590 va_end(args);
1591 JNI_END
1594 JNI_ENTRY(void, jni_CallStaticVoidMethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args))
1595 JNIWrapper("CallStaticVoidMethodV");
1596 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodV__entry, env, cls, methodID);
1597 DT_VOID_RETURN_MARK(CallStaticVoidMethodV);
1599 JavaValue jvalue(T_VOID);
1600 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1601 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1602 JNI_END
1605 JNI_ENTRY(void, jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args))
1606 JNIWrapper("CallStaticVoidMethodA");
1607 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodA__entry, env, cls, methodID);
1608 DT_VOID_RETURN_MARK(CallStaticVoidMethodA);
1610 JavaValue jvalue(T_VOID);
1611 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1612 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1613 JNI_END
1616 //
1617 // Accessing Fields
1618 //
1621 DT_RETURN_MARK_DECL(GetFieldID, jfieldID);
1623 JNI_ENTRY(jfieldID, jni_GetFieldID(JNIEnv *env, jclass clazz,
1624 const char *name, const char *sig))
1625 JNIWrapper("GetFieldID");
1626 DTRACE_PROBE4(hotspot_jni, GetFieldID__entry, env, clazz, name, sig);
1627 jfieldID ret = 0;
1628 DT_RETURN_MARK(GetFieldID, jfieldID, (const jfieldID&)ret);
1630 // The class should have been loaded (we have an instance of the class
1631 // passed in) so the field and signature should already be in the symbol
1632 // table. If they're not there, the field doesn't exist.
1633 symbolHandle fieldname =
1634 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
1635 symbolHandle signame =
1636 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1637 if (fieldname.is_null() || signame.is_null()) {
1638 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1639 }
1640 KlassHandle k(THREAD,
1641 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1642 // Make sure class is initialized before handing id's out to fields
1643 Klass::cast(k())->initialize(CHECK_NULL);
1645 fieldDescriptor fd;
1646 if (!Klass::cast(k())->oop_is_instance() ||
1647 !instanceKlass::cast(k())->find_field(fieldname(), signame(), false, &fd)) {
1648 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1649 }
1651 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1652 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1653 ret = jfieldIDWorkaround::to_instance_jfieldID(k(), fd.offset());
1654 return ret;
1655 JNI_END
1658 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1659 JNIWrapper("GetObjectField");
1660 DTRACE_PROBE3(hotspot_jni, GetObjectField__entry, env, obj, fieldID);
1661 oop o = JNIHandles::resolve_non_null(obj);
1662 klassOop k = o->klass();
1663 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1664 // Keep JVMTI addition small and only check enabled flag here.
1665 // jni_GetField_probe() assumes that is okay to create handles.
1666 if (JvmtiExport::should_post_field_access()) {
1667 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1668 }
1669 jobject ret = JNIHandles::make_local(env, o->obj_field(offset));
1670 DTRACE_PROBE1(hotspot_jni, GetObjectField__return, ret);
1671 return ret;
1672 JNI_END
1675 #define DEFINE_GETFIELD(Return,Fieldname,Result) \
1676 \
1677 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return);\
1678 \
1679 JNI_QUICK_ENTRY(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1680 JNIWrapper("Get" XSTR(Result) "Field"); \
1681 \
1682 DTRACE_PROBE3(hotspot_jni, Get##Result##Field__entry, env, obj, fieldID);\
1683 Return ret = 0;\
1684 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1685 \
1686 oop o = JNIHandles::resolve_non_null(obj); \
1687 klassOop k = o->klass(); \
1688 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1689 /* Keep JVMTI addition small and only check enabled flag here. */ \
1690 /* jni_GetField_probe_nh() assumes that is not okay to create handles */ \
1691 /* and creates a ResetNoHandleMark. */ \
1692 if (JvmtiExport::should_post_field_access()) { \
1693 o = JvmtiExport::jni_GetField_probe_nh(thread, obj, o, k, fieldID, false); \
1694 } \
1695 ret = o->Fieldname##_field(offset); \
1696 return ret; \
1697 JNI_END
1699 DEFINE_GETFIELD(jboolean, bool, Boolean)
1700 DEFINE_GETFIELD(jbyte, byte, Byte)
1701 DEFINE_GETFIELD(jchar, char, Char)
1702 DEFINE_GETFIELD(jshort, short, Short)
1703 DEFINE_GETFIELD(jint, int, Int)
1704 DEFINE_GETFIELD(jlong, long, Long)
1705 DEFINE_GETFIELD(jfloat, float, Float)
1706 DEFINE_GETFIELD(jdouble, double, Double)
1708 address jni_GetBooleanField_addr() {
1709 return (address)jni_GetBooleanField;
1710 }
1711 address jni_GetByteField_addr() {
1712 return (address)jni_GetByteField;
1713 }
1714 address jni_GetCharField_addr() {
1715 return (address)jni_GetCharField;
1716 }
1717 address jni_GetShortField_addr() {
1718 return (address)jni_GetShortField;
1719 }
1720 address jni_GetIntField_addr() {
1721 return (address)jni_GetIntField;
1722 }
1723 address jni_GetLongField_addr() {
1724 return (address)jni_GetLongField;
1725 }
1726 address jni_GetFloatField_addr() {
1727 return (address)jni_GetFloatField;
1728 }
1729 address jni_GetDoubleField_addr() {
1730 return (address)jni_GetDoubleField;
1731 }
1733 JNI_QUICK_ENTRY(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1734 JNIWrapper("SetObjectField");
1735 DTRACE_PROBE4(hotspot_jni, SetObjectField__entry, env, obj, fieldID, value);
1736 oop o = JNIHandles::resolve_non_null(obj);
1737 klassOop k = o->klass();
1738 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1739 // Keep JVMTI addition small and only check enabled flag here.
1740 // jni_SetField_probe_nh() assumes that is not okay to create handles
1741 // and creates a ResetNoHandleMark.
1742 if (JvmtiExport::should_post_field_modification()) {
1743 jvalue field_value;
1744 field_value.l = value;
1745 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, 'L', (jvalue *)&field_value);
1746 }
1747 o->obj_field_put(offset, JNIHandles::resolve(value));
1748 DTRACE_PROBE(hotspot_jni, SetObjectField__return);
1749 JNI_END
1751 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType) \
1752 \
1753 JNI_QUICK_ENTRY(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1754 JNIWrapper("Set" XSTR(Result) "Field"); \
1755 \
1756 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, Set##Result##Field__entry, \
1757 ( JNIEnv*, jobject, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1758 HS_DTRACE_PROBE_N(hotspot_jni, Set##Result##Field__entry, \
1759 ( env, obj, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1760 \
1761 oop o = JNIHandles::resolve_non_null(obj); \
1762 klassOop k = o->klass(); \
1763 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1764 /* Keep JVMTI addition small and only check enabled flag here. */ \
1765 /* jni_SetField_probe_nh() assumes that is not okay to create handles */ \
1766 /* and creates a ResetNoHandleMark. */ \
1767 if (JvmtiExport::should_post_field_modification()) { \
1768 jvalue field_value; \
1769 field_value.unionType = value; \
1770 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \
1771 } \
1772 o->Fieldname##_field_put(offset, value); \
1773 DTRACE_PROBE(hotspot_jni, Set##Result##Field__return);\
1774 JNI_END
1776 DEFINE_SETFIELD(jboolean, bool, Boolean, 'Z', z)
1777 DEFINE_SETFIELD(jbyte, byte, Byte, 'B', b)
1778 DEFINE_SETFIELD(jchar, char, Char, 'C', c)
1779 DEFINE_SETFIELD(jshort, short, Short, 'S', s)
1780 DEFINE_SETFIELD(jint, int, Int, 'I', i)
1781 DEFINE_SETFIELD(jlong, long, Long, 'J', j)
1782 DEFINE_SETFIELD(jfloat, float, Float, 'F', f)
1783 DEFINE_SETFIELD(jdouble, double, Double, 'D', d)
1785 DT_RETURN_MARK_DECL(ToReflectedField, jobject);
1787 JNI_ENTRY(jobject, jni_ToReflectedField(JNIEnv *env, jclass cls, jfieldID fieldID, jboolean isStatic))
1788 JNIWrapper("ToReflectedField");
1789 DTRACE_PROBE4(hotspot_jni, ToReflectedField__entry,
1790 env, cls, fieldID, isStatic);
1791 jobject ret = NULL;
1792 DT_RETURN_MARK(ToReflectedField, jobject, (const jobject&)ret);
1794 fieldDescriptor fd;
1795 bool found = false;
1796 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(cls));
1798 assert(jfieldIDWorkaround::is_static_jfieldID(fieldID) == (isStatic != 0), "invalid fieldID");
1800 if (isStatic) {
1801 // Static field. The fieldID a JNIid specifying the field holder and the offset within the klassOop.
1802 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1803 assert(id->is_static_field_id(), "invalid static field id");
1804 found = instanceKlass::cast(id->holder())->find_local_field_from_offset(id->offset(), true, &fd);
1805 } else {
1806 // Non-static field. The fieldID is really the offset of the field within the instanceOop.
1807 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1808 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, &fd);
1809 }
1810 assert(found, "bad fieldID passed into jni_ToReflectedField");
1811 oop reflected = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
1812 ret = JNIHandles::make_local(env, reflected);
1813 return ret;
1814 JNI_END
1817 //
1818 // Accessing Static Fields
1819 //
1820 DT_RETURN_MARK_DECL(GetStaticFieldID, jfieldID);
1822 JNI_ENTRY(jfieldID, jni_GetStaticFieldID(JNIEnv *env, jclass clazz,
1823 const char *name, const char *sig))
1824 JNIWrapper("GetStaticFieldID");
1825 DTRACE_PROBE4(hotspot_jni, GetStaticFieldID__entry, env, clazz, name, sig);
1826 jfieldID ret = NULL;
1827 DT_RETURN_MARK(GetStaticFieldID, jfieldID, (const jfieldID&)ret);
1829 // The class should have been loaded (we have an instance of the class
1830 // passed in) so the field and signature should already be in the symbol
1831 // table. If they're not there, the field doesn't exist.
1832 symbolHandle fieldname =
1833 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
1834 symbolHandle signame =
1835 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1836 if (fieldname.is_null() || signame.is_null()) {
1837 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1838 }
1839 KlassHandle k(THREAD,
1840 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1841 // Make sure class is initialized before handing id's out to static fields
1842 Klass::cast(k())->initialize(CHECK_NULL);
1844 fieldDescriptor fd;
1845 if (!Klass::cast(k())->oop_is_instance() ||
1846 !instanceKlass::cast(k())->find_field(fieldname(), signame(), true, &fd)) {
1847 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1848 }
1850 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
1851 JNIid* id = instanceKlass::cast(fd.field_holder())->jni_id_for(fd.offset());
1852 debug_only(id->set_is_static_field_id();)
1854 debug_only(int first_offset = instanceKlass::cast(fd.field_holder())->offset_of_static_fields();)
1855 debug_only(int end_offset = first_offset + (instanceKlass::cast(fd.field_holder())->static_field_size() * wordSize);)
1856 assert(id->offset() >= first_offset && id->offset() < end_offset, "invalid static field offset");
1858 ret = jfieldIDWorkaround::to_static_jfieldID(id);
1859 return ret;
1860 JNI_END
1863 JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID))
1864 JNIWrapper("GetStaticObjectField");
1865 DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID);
1866 #ifndef JNICHECK_KERNEL
1867 DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);)
1868 #endif // JNICHECK_KERNEL
1869 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1870 assert(id->is_static_field_id(), "invalid static field id");
1871 // Keep JVMTI addition small and only check enabled flag here.
1872 // jni_GetField_probe() assumes that is okay to create handles.
1873 if (JvmtiExport::should_post_field_access()) {
1874 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true);
1875 }
1876 jobject ret = JNIHandles::make_local(id->holder()->obj_field(id->offset()));
1877 DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret);
1878 return ret;
1879 JNI_END
1881 #define DEFINE_GETSTATICFIELD(Return,Fieldname,Result) \
1882 \
1883 DT_RETURN_MARK_DECL_FOR(Result, GetStatic##Result##Field, Return);\
1884 \
1885 JNI_ENTRY(Return, jni_GetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID)) \
1886 JNIWrapper("GetStatic" XSTR(Result) "Field"); \
1887 DTRACE_PROBE3(hotspot_jni, GetStatic##Result##Field__entry, env, clazz, fieldID);\
1888 Return ret = 0;\
1889 DT_RETURN_MARK_FOR(Result, GetStatic##Result##Field, Return, \
1890 (const Return&)ret);\
1891 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1892 assert(id->is_static_field_id(), "invalid static field id"); \
1893 /* Keep JVMTI addition small and only check enabled flag here. */ \
1894 /* jni_GetField_probe() assumes that is okay to create handles. */ \
1895 if (JvmtiExport::should_post_field_access()) { \
1896 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); \
1897 } \
1898 ret = id->holder()-> Fieldname##_field (id->offset()); \
1899 return ret;\
1900 JNI_END
1902 DEFINE_GETSTATICFIELD(jboolean, bool, Boolean)
1903 DEFINE_GETSTATICFIELD(jbyte, byte, Byte)
1904 DEFINE_GETSTATICFIELD(jchar, char, Char)
1905 DEFINE_GETSTATICFIELD(jshort, short, Short)
1906 DEFINE_GETSTATICFIELD(jint, int, Int)
1907 DEFINE_GETSTATICFIELD(jlong, long, Long)
1908 DEFINE_GETSTATICFIELD(jfloat, float, Float)
1909 DEFINE_GETSTATICFIELD(jdouble, double, Double)
1912 JNI_ENTRY(void, jni_SetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID, jobject value))
1913 JNIWrapper("SetStaticObjectField");
1914 DTRACE_PROBE4(hotspot_jni, SetStaticObjectField__entry, env, clazz, fieldID, value);
1915 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1916 assert(id->is_static_field_id(), "invalid static field id");
1917 // Keep JVMTI addition small and only check enabled flag here.
1918 // jni_SetField_probe() assumes that is okay to create handles.
1919 if (JvmtiExport::should_post_field_modification()) {
1920 jvalue field_value;
1921 field_value.l = value;
1922 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, 'L', (jvalue *)&field_value);
1923 }
1924 id->holder()->obj_field_put(id->offset(), JNIHandles::resolve(value));
1925 DTRACE_PROBE(hotspot_jni, SetStaticObjectField__return);
1926 JNI_END
1929 #define DEFINE_SETSTATICFIELD(Argument,Fieldname,Result,SigType,unionType) \
1930 \
1931 JNI_ENTRY(void, jni_SetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID, Argument value)) \
1932 JNIWrapper("SetStatic" XSTR(Result) "Field"); \
1933 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, SetStatic##Result##Field__entry,\
1934 ( JNIEnv*, jclass, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1935 HS_DTRACE_PROBE_N(hotspot_jni, SetStatic##Result##Field__entry, \
1936 ( env, clazz, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1937 \
1938 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1939 assert(id->is_static_field_id(), "invalid static field id"); \
1940 /* Keep JVMTI addition small and only check enabled flag here. */ \
1941 /* jni_SetField_probe() assumes that is okay to create handles. */ \
1942 if (JvmtiExport::should_post_field_modification()) { \
1943 jvalue field_value; \
1944 field_value.unionType = value; \
1945 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, SigType, (jvalue *)&field_value); \
1946 } \
1947 id->holder()-> Fieldname##_field_put (id->offset(), value); \
1948 DTRACE_PROBE(hotspot_jni, SetStatic##Result##Field__return);\
1949 JNI_END
1951 DEFINE_SETSTATICFIELD(jboolean, bool, Boolean, 'Z', z)
1952 DEFINE_SETSTATICFIELD(jbyte, byte, Byte, 'B', b)
1953 DEFINE_SETSTATICFIELD(jchar, char, Char, 'C', c)
1954 DEFINE_SETSTATICFIELD(jshort, short, Short, 'S', s)
1955 DEFINE_SETSTATICFIELD(jint, int, Int, 'I', i)
1956 DEFINE_SETSTATICFIELD(jlong, long, Long, 'J', j)
1957 DEFINE_SETSTATICFIELD(jfloat, float, Float, 'F', f)
1958 DEFINE_SETSTATICFIELD(jdouble, double, Double, 'D', d)
1961 //
1962 // String Operations
1963 //
1965 // Unicode Interface
1967 DT_RETURN_MARK_DECL(NewString, jstring);
1969 JNI_ENTRY(jstring, jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len))
1970 JNIWrapper("NewString");
1971 DTRACE_PROBE3(hotspot_jni, NewString__entry, env, unicodeChars, len);
1972 jstring ret = NULL;
1973 DT_RETURN_MARK(NewString, jstring, (const jstring&)ret);
1974 oop string=java_lang_String::create_oop_from_unicode((jchar*) unicodeChars, len, CHECK_NULL);
1975 ret = (jstring) JNIHandles::make_local(env, string);
1976 return ret;
1977 JNI_END
1980 JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string))
1981 JNIWrapper("GetStringLength");
1982 DTRACE_PROBE2(hotspot_jni, GetStringLength__entry, env, string);
1983 jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string));
1984 DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret);
1985 return ret;
1986 JNI_END
1989 JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars(
1990 JNIEnv *env, jstring string, jboolean *isCopy))
1991 JNIWrapper("GetStringChars");
1992 DTRACE_PROBE3(hotspot_jni, GetStringChars__entry, env, string, isCopy);
1993 //%note jni_5
1994 if (isCopy != NULL) {
1995 *isCopy = JNI_TRUE;
1996 }
1997 oop s = JNIHandles::resolve_non_null(string);
1998 int s_len = java_lang_String::length(s);
1999 typeArrayOop s_value = java_lang_String::value(s);
2000 int s_offset = java_lang_String::offset(s);
2001 jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1); // add one for zero termination
2002 if (s_len > 0) {
2003 memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len);
2004 }
2005 buf[s_len] = 0;
2006 DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf);
2007 return buf;
2008 JNI_END
2011 JNI_QUICK_ENTRY(void, jni_ReleaseStringChars(JNIEnv *env, jstring str, const jchar *chars))
2012 JNIWrapper("ReleaseStringChars");
2013 DTRACE_PROBE3(hotspot_jni, ReleaseStringChars__entry, env, str, chars);
2014 //%note jni_6
2015 if (chars != NULL) {
2016 // Since String objects are supposed to be immutable, don't copy any
2017 // new data back. A bad user will have to go after the char array.
2018 FreeHeap((void*) chars);
2019 }
2020 DTRACE_PROBE(hotspot_jni, ReleaseStringChars__return);
2021 JNI_END
2024 // UTF Interface
2026 DT_RETURN_MARK_DECL(NewStringUTF, jstring);
2028 JNI_ENTRY(jstring, jni_NewStringUTF(JNIEnv *env, const char *bytes))
2029 JNIWrapper("NewStringUTF");
2030 DTRACE_PROBE2(hotspot_jni, NewStringUTF__entry, env, bytes);
2031 jstring ret;
2032 DT_RETURN_MARK(NewStringUTF, jstring, (const jstring&)ret);
2034 oop result = java_lang_String::create_oop_from_str((char*) bytes, CHECK_NULL);
2035 ret = (jstring) JNIHandles::make_local(env, result);
2036 return ret;
2037 JNI_END
2040 JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string))
2041 JNIWrapper("GetStringUTFLength");
2042 DTRACE_PROBE2(hotspot_jni, GetStringUTFLength__entry, env, string);
2043 jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string));
2044 DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret);
2045 return ret;
2046 JNI_END
2049 JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboolean *isCopy))
2050 JNIWrapper("GetStringUTFChars");
2051 DTRACE_PROBE3(hotspot_jni, GetStringUTFChars__entry, env, string, isCopy);
2052 ResourceMark rm;
2053 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(string));
2054 int length = (int)strlen(str);
2055 char* result = AllocateHeap(length+1, "GetStringUTFChars");
2056 strcpy(result, str);
2057 if (isCopy != NULL) *isCopy = JNI_TRUE;
2058 DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result);
2059 return result;
2060 JNI_END
2063 JNI_LEAF(void, jni_ReleaseStringUTFChars(JNIEnv *env, jstring str, const char *chars))
2064 JNIWrapper("ReleaseStringUTFChars");
2065 DTRACE_PROBE3(hotspot_jni, ReleaseStringUTFChars__entry, env, str, chars);
2066 if (chars != NULL) {
2067 FreeHeap((char*) chars);
2068 }
2069 DTRACE_PROBE(hotspot_jni, ReleaseStringUTFChars__return);
2070 JNI_END
2073 JNI_QUICK_ENTRY(jsize, jni_GetArrayLength(JNIEnv *env, jarray array))
2074 JNIWrapper("GetArrayLength");
2075 DTRACE_PROBE2(hotspot_jni, GetArrayLength__entry, env, array);
2076 arrayOop a = arrayOop(JNIHandles::resolve_non_null(array));
2077 assert(a->is_array(), "must be array");
2078 jsize ret = a->length();
2079 DTRACE_PROBE1(hotspot_jni, GetArrayLength__return, ret);
2080 return ret;
2081 JNI_END
2084 //
2085 // Object Array Operations
2086 //
2088 DT_RETURN_MARK_DECL(NewObjectArray, jobjectArray);
2090 JNI_ENTRY(jobjectArray, jni_NewObjectArray(JNIEnv *env, jsize length, jclass elementClass, jobject initialElement))
2091 JNIWrapper("NewObjectArray");
2092 DTRACE_PROBE4(hotspot_jni, NewObjectArray__entry, env, length, elementClass, initialElement);
2093 jobjectArray ret = NULL;
2094 DT_RETURN_MARK(NewObjectArray, jobjectArray, (const jobjectArray&)ret);
2095 KlassHandle ek(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(elementClass)));
2096 klassOop ako = Klass::cast(ek())->array_klass(CHECK_NULL);
2097 KlassHandle ak = KlassHandle(THREAD, ako);
2098 objArrayKlass::cast(ak())->initialize(CHECK_NULL);
2099 objArrayOop result = objArrayKlass::cast(ak())->allocate(length, CHECK_NULL);
2100 oop initial_value = JNIHandles::resolve(initialElement);
2101 if (initial_value != NULL) { // array already initialized with NULL
2102 for (int index = 0; index < length; index++) {
2103 result->obj_at_put(index, initial_value);
2104 }
2105 }
2106 ret = (jobjectArray) JNIHandles::make_local(env, result);
2107 return ret;
2108 JNI_END
2110 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject);
2112 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2113 JNIWrapper("GetObjectArrayElement");
2114 DTRACE_PROBE3(hotspot_jni, GetObjectArrayElement__entry, env, array, index);
2115 jobject ret = NULL;
2116 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2117 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2118 if (a->is_within_bounds(index)) {
2119 ret = JNIHandles::make_local(env, a->obj_at(index));
2120 return ret;
2121 } else {
2122 char buf[jintAsStringSize];
2123 sprintf(buf, "%d", index);
2124 THROW_MSG_0(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2125 }
2126 JNI_END
2128 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement);
2130 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2131 JNIWrapper("SetObjectArrayElement");
2132 DTRACE_PROBE4(hotspot_jni, SetObjectArrayElement__entry, env, array, index, value);
2133 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2135 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2136 oop v = JNIHandles::resolve(value);
2137 if (a->is_within_bounds(index)) {
2138 if (v == NULL || v->is_a(objArrayKlass::cast(a->klass())->element_klass())) {
2139 a->obj_at_put(index, v);
2140 } else {
2141 THROW(vmSymbols::java_lang_ArrayStoreException());
2142 }
2143 } else {
2144 char buf[jintAsStringSize];
2145 sprintf(buf, "%d", index);
2146 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2147 }
2148 JNI_END
2151 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result) \
2152 \
2153 DT_RETURN_MARK_DECL(New##Result##Array, Return);\
2154 \
2155 JNI_ENTRY(Return, \
2156 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2157 JNIWrapper("New" XSTR(Result) "Array"); \
2158 DTRACE_PROBE2(hotspot_jni, New##Result##Array__entry, env, len);\
2159 Return ret = NULL;\
2160 DT_RETURN_MARK(New##Result##Array, Return, (const Return&)ret);\
2161 \
2162 oop obj= oopFactory::Allocator(len, CHECK_0); \
2163 ret = (Return) JNIHandles::make_local(env, obj); \
2164 return ret;\
2165 JNI_END
2167 DEFINE_NEWSCALARARRAY(jbooleanArray, new_boolArray, Boolean)
2168 DEFINE_NEWSCALARARRAY(jbyteArray, new_byteArray, Byte)
2169 DEFINE_NEWSCALARARRAY(jshortArray, new_shortArray, Short)
2170 DEFINE_NEWSCALARARRAY(jcharArray, new_charArray, Char)
2171 DEFINE_NEWSCALARARRAY(jintArray, new_intArray, Int)
2172 DEFINE_NEWSCALARARRAY(jlongArray, new_longArray, Long)
2173 DEFINE_NEWSCALARARRAY(jfloatArray, new_singleArray, Float)
2174 DEFINE_NEWSCALARARRAY(jdoubleArray, new_doubleArray, Double)
2177 // Return an address which will fault if the caller writes to it.
2179 static char* get_bad_address() {
2180 static char* bad_address = NULL;
2181 if (bad_address == NULL) {
2182 size_t size = os::vm_allocation_granularity();
2183 bad_address = os::reserve_memory(size);
2184 if (bad_address != NULL) {
2185 os::protect_memory(bad_address, size, os::MEM_PROT_READ,
2186 /*is_committed*/false);
2187 }
2188 }
2189 return bad_address;
2190 }
2193 #define DEFINE_GETSCALARARRAYELEMENTS(ElementTag,ElementType,Result, Tag) \
2194 \
2195 JNI_QUICK_ENTRY(ElementType*, \
2196 jni_Get##Result##ArrayElements(JNIEnv *env, ElementType##Array array, jboolean *isCopy)) \
2197 JNIWrapper("Get" XSTR(Result) "ArrayElements"); \
2198 DTRACE_PROBE3(hotspot_jni, Get##Result##ArrayElements__entry, env, array, isCopy);\
2199 /* allocate an chunk of memory in c land */ \
2200 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2201 ElementType* result; \
2202 int len = a->length(); \
2203 if (len == 0) { \
2204 /* Empty array: legal but useless, can't return NULL. \
2205 * Return a pointer to something useless. \
2206 * Avoid asserts in typeArrayOop. */ \
2207 result = (ElementType*)get_bad_address(); \
2208 } else { \
2209 result = NEW_C_HEAP_ARRAY(ElementType, len); \
2210 /* copy the array to the c chunk */ \
2211 memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \
2212 } \
2213 if (isCopy) *isCopy = JNI_TRUE; \
2214 DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\
2215 return result; \
2216 JNI_END
2218 DEFINE_GETSCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2219 DEFINE_GETSCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2220 DEFINE_GETSCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2221 DEFINE_GETSCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2222 DEFINE_GETSCALARARRAYELEMENTS(T_INT, jint, Int, int)
2223 DEFINE_GETSCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2224 DEFINE_GETSCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2225 DEFINE_GETSCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2228 #define DEFINE_RELEASESCALARARRAYELEMENTS(ElementTag,ElementType,Result,Tag) \
2229 \
2230 JNI_QUICK_ENTRY(void, \
2231 jni_Release##Result##ArrayElements(JNIEnv *env, ElementType##Array array, \
2232 ElementType *buf, jint mode)) \
2233 JNIWrapper("Release" XSTR(Result) "ArrayElements"); \
2234 DTRACE_PROBE4(hotspot_jni, Release##Result##ArrayElements__entry, env, array, buf, mode);\
2235 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2236 int len = a->length(); \
2237 if (len != 0) { /* Empty array: nothing to free or copy. */ \
2238 if ((mode == 0) || (mode == JNI_COMMIT)) { \
2239 memcpy(a->Tag##_at_addr(0), buf, sizeof(ElementType)*len); \
2240 } \
2241 if ((mode == 0) || (mode == JNI_ABORT)) { \
2242 FreeHeap(buf); \
2243 } \
2244 } \
2245 DTRACE_PROBE(hotspot_jni, Release##Result##ArrayElements__return);\
2246 JNI_END
2248 DEFINE_RELEASESCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2249 DEFINE_RELEASESCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2250 DEFINE_RELEASESCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2251 DEFINE_RELEASESCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2252 DEFINE_RELEASESCALARARRAYELEMENTS(T_INT, jint, Int, int)
2253 DEFINE_RELEASESCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2254 DEFINE_RELEASESCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2255 DEFINE_RELEASESCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2257 #define DEFINE_GETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2258 DT_VOID_RETURN_MARK_DECL(Get##Result##ArrayRegion);\
2259 \
2260 JNI_ENTRY(void, \
2261 jni_Get##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2262 jsize len, ElementType *buf)) \
2263 JNIWrapper("Get" XSTR(Result) "ArrayRegion"); \
2264 DTRACE_PROBE5(hotspot_jni, Get##Result##ArrayRegion__entry, env, array, start, len, buf);\
2265 DT_VOID_RETURN_MARK(Get##Result##ArrayRegion); \
2266 typeArrayOop src = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2267 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)src->length())) { \
2268 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2269 } else { \
2270 if (len > 0) { \
2271 int sc = typeArrayKlass::cast(src->klass())->log2_element_size(); \
2272 memcpy((u_char*) buf, \
2273 (u_char*) src->Tag##_at_addr(start), \
2274 len << sc); \
2275 } \
2276 } \
2277 JNI_END
2279 DEFINE_GETSCALARARRAYREGION(T_BOOLEAN, jboolean,Boolean, bool)
2280 DEFINE_GETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2281 DEFINE_GETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2282 DEFINE_GETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2283 DEFINE_GETSCALARARRAYREGION(T_INT, jint, Int, int)
2284 DEFINE_GETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2285 DEFINE_GETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2286 DEFINE_GETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2288 #define DEFINE_SETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2289 DT_VOID_RETURN_MARK_DECL(Set##Result##ArrayRegion);\
2290 \
2291 JNI_ENTRY(void, \
2292 jni_Set##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2293 jsize len, const ElementType *buf)) \
2294 JNIWrapper("Set" XSTR(Result) "ArrayRegion"); \
2295 DTRACE_PROBE5(hotspot_jni, Set##Result##ArrayRegion__entry, env, array, start, len, buf);\
2296 DT_VOID_RETURN_MARK(Set##Result##ArrayRegion); \
2297 typeArrayOop dst = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2298 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)dst->length())) { \
2299 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2300 } else { \
2301 if (len > 0) { \
2302 int sc = typeArrayKlass::cast(dst->klass())->log2_element_size(); \
2303 memcpy((u_char*) dst->Tag##_at_addr(start), \
2304 (u_char*) buf, \
2305 len << sc); \
2306 } \
2307 } \
2308 JNI_END
2310 DEFINE_SETSCALARARRAYREGION(T_BOOLEAN, jboolean, Boolean, bool)
2311 DEFINE_SETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2312 DEFINE_SETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2313 DEFINE_SETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2314 DEFINE_SETSCALARARRAYREGION(T_INT, jint, Int, int)
2315 DEFINE_SETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2316 DEFINE_SETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2317 DEFINE_SETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2320 //
2321 // Interception of natives
2322 //
2324 // The RegisterNatives call being attempted tried to register with a method that
2325 // is not native. Ask JVM TI what prefixes have been specified. Then check
2326 // to see if the native method is now wrapped with the prefixes. See the
2327 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
2328 static methodOop find_prefixed_native(KlassHandle k,
2329 symbolHandle name, symbolHandle signature, TRAPS) {
2330 ResourceMark rm(THREAD);
2331 methodOop method;
2332 int name_len = name->utf8_length();
2333 char* name_str = name->as_utf8();
2334 int prefix_count;
2335 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
2336 for (int i = 0; i < prefix_count; i++) {
2337 char* prefix = prefixes[i];
2338 int prefix_len = (int)strlen(prefix);
2340 // try adding this prefix to the method name and see if it matches another method name
2341 int trial_len = name_len + prefix_len;
2342 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
2343 strcpy(trial_name_str, prefix);
2344 strcat(trial_name_str, name_str);
2345 symbolHandle trial_name(THREAD, SymbolTable::probe(trial_name_str, trial_len));
2346 if (trial_name.is_null()) {
2347 continue; // no such symbol, so this prefix wasn't used, try the next prefix
2348 }
2349 method = Klass::cast(k())->lookup_method(trial_name(), signature());
2350 if (method == NULL) {
2351 continue; // signature doesn't match, try the next prefix
2352 }
2353 if (method->is_native()) {
2354 method->set_is_prefixed_native();
2355 return method; // wahoo, we found a prefixed version of the method, return it
2356 }
2357 // found as non-native, so prefix is good, add it, probably just need more prefixes
2358 name_len = trial_len;
2359 name_str = trial_name_str;
2360 }
2361 return NULL; // not found
2362 }
2364 static bool register_native(KlassHandle k, symbolHandle name, symbolHandle signature, address entry, TRAPS) {
2365 methodOop method = Klass::cast(k())->lookup_method(name(), signature());
2366 if (method == NULL) {
2367 ResourceMark rm;
2368 stringStream st;
2369 st.print("Method %s name or signature does not match",
2370 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
2371 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2372 }
2373 if (!method->is_native()) {
2374 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
2375 method = find_prefixed_native(k, name, signature, THREAD);
2376 if (method == NULL) {
2377 ResourceMark rm;
2378 stringStream st;
2379 st.print("Method %s is not declared as native",
2380 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
2381 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2382 }
2383 }
2385 if (entry != NULL) {
2386 method->set_native_function(entry,
2387 methodOopDesc::native_bind_event_is_interesting);
2388 } else {
2389 method->clear_native_function();
2390 }
2391 if (PrintJNIResolving) {
2392 ResourceMark rm(THREAD);
2393 tty->print_cr("[Registering JNI native method %s.%s]",
2394 Klass::cast(method->method_holder())->external_name(),
2395 method->name()->as_C_string());
2396 }
2397 return true;
2398 }
2400 DT_RETURN_MARK_DECL(RegisterNatives, jint);
2402 JNI_ENTRY(jint, jni_RegisterNatives(JNIEnv *env, jclass clazz,
2403 const JNINativeMethod *methods,
2404 jint nMethods))
2405 JNIWrapper("RegisterNatives");
2406 DTRACE_PROBE4(hotspot_jni, RegisterNatives__entry, env, clazz, methods, nMethods);
2407 jint ret = 0;
2408 DT_RETURN_MARK(RegisterNatives, jint, (const jint&)ret);
2410 KlassHandle h_k(thread, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
2412 for (int index = 0; index < nMethods; index++) {
2413 const char* meth_name = methods[index].name;
2414 const char* meth_sig = methods[index].signature;
2415 int meth_name_len = (int)strlen(meth_name);
2417 // The class should have been loaded (we have an instance of the class
2418 // passed in) so the method and signature should already be in the symbol
2419 // table. If they're not there, the method doesn't exist.
2420 symbolHandle name(THREAD, SymbolTable::probe(meth_name, meth_name_len));
2421 symbolHandle signature(THREAD, SymbolTable::probe(meth_sig, (int)strlen(meth_sig)));
2423 if (name.is_null() || signature.is_null()) {
2424 ResourceMark rm;
2425 stringStream st;
2426 st.print("Method %s.%s%s not found", Klass::cast(h_k())->external_name(), meth_name, meth_sig);
2427 // Must return negative value on failure
2428 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), -1);
2429 }
2431 bool res = register_native(h_k, name, signature,
2432 (address) methods[index].fnPtr, THREAD);
2433 if (!res) {
2434 ret = -1;
2435 break;
2436 }
2437 }
2438 return ret;
2439 JNI_END
2442 JNI_ENTRY(jint, jni_UnregisterNatives(JNIEnv *env, jclass clazz))
2443 JNIWrapper("UnregisterNatives");
2444 DTRACE_PROBE2(hotspot_jni, UnregisterNatives__entry, env, clazz);
2445 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz));
2446 //%note jni_2
2447 if (Klass::cast(k)->oop_is_instance()) {
2448 for (int index = 0; index < instanceKlass::cast(k)->methods()->length(); index++) {
2449 methodOop m = methodOop(instanceKlass::cast(k)->methods()->obj_at(index));
2450 if (m->is_native()) {
2451 m->clear_native_function();
2452 m->set_signature_handler(NULL);
2453 }
2454 }
2455 }
2456 DTRACE_PROBE1(hotspot_jni, UnregisterNatives__return, 0);
2457 return 0;
2458 JNI_END
2460 //
2461 // Monitor functions
2462 //
2464 DT_RETURN_MARK_DECL(MonitorEnter, jint);
2466 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2467 DTRACE_PROBE2(hotspot_jni, MonitorEnter__entry, env, jobj);
2468 jint ret = JNI_ERR;
2469 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2471 // If the object is null, we can't do anything with it
2472 if (jobj == NULL) {
2473 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2474 }
2476 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2477 ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR));
2478 ret = JNI_OK;
2479 return ret;
2480 JNI_END
2482 DT_RETURN_MARK_DECL(MonitorExit, jint);
2484 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2485 DTRACE_PROBE2(hotspot_jni, MonitorExit__entry, env, jobj);
2486 jint ret = JNI_ERR;
2487 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2489 // Don't do anything with a null object
2490 if (jobj == NULL) {
2491 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2492 }
2494 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2495 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2497 ret = JNI_OK;
2498 return ret;
2499 JNI_END
2501 //
2502 // Extensions
2503 //
2505 DT_VOID_RETURN_MARK_DECL(GetStringRegion);
2507 JNI_ENTRY(void, jni_GetStringRegion(JNIEnv *env, jstring string, jsize start, jsize len, jchar *buf))
2508 JNIWrapper("GetStringRegion");
2509 DTRACE_PROBE5(hotspot_jni, GetStringRegion__entry, env, string, start, len, buf);
2510 DT_VOID_RETURN_MARK(GetStringRegion);
2511 oop s = JNIHandles::resolve_non_null(string);
2512 int s_len = java_lang_String::length(s);
2513 if (start < 0 || len < 0 || start + len > s_len) {
2514 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2515 } else {
2516 if (len > 0) {
2517 int s_offset = java_lang_String::offset(s);
2518 typeArrayOop s_value = java_lang_String::value(s);
2519 memcpy(buf, s_value->char_at_addr(s_offset+start), sizeof(jchar)*len);
2520 }
2521 }
2522 JNI_END
2524 DT_VOID_RETURN_MARK_DECL(GetStringUTFRegion);
2526 JNI_ENTRY(void, jni_GetStringUTFRegion(JNIEnv *env, jstring string, jsize start, jsize len, char *buf))
2527 JNIWrapper("GetStringUTFRegion");
2528 DTRACE_PROBE5(hotspot_jni, GetStringUTFRegion__entry, env, string, start, len, buf);
2529 DT_VOID_RETURN_MARK(GetStringUTFRegion);
2530 oop s = JNIHandles::resolve_non_null(string);
2531 int s_len = java_lang_String::length(s);
2532 if (start < 0 || len < 0 || start + len > s_len) {
2533 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2534 } else {
2535 //%note jni_7
2536 if (len > 0) {
2537 ResourceMark rm(THREAD);
2538 char *utf_region = java_lang_String::as_utf8_string(s, start, len);
2539 int utf_len = (int)strlen(utf_region);
2540 memcpy(buf, utf_region, utf_len);
2541 buf[utf_len] = 0;
2542 } else {
2543 // JDK null-terminates the buffer even in len is zero
2544 if (buf != NULL) {
2545 buf[0] = 0;
2546 }
2547 }
2548 }
2549 JNI_END
2552 JNI_ENTRY(void*, jni_GetPrimitiveArrayCritical(JNIEnv *env, jarray array, jboolean *isCopy))
2553 JNIWrapper("GetPrimitiveArrayCritical");
2554 DTRACE_PROBE3(hotspot_jni, GetPrimitiveArrayCritical__entry, env, array, isCopy);
2555 GC_locker::lock_critical(thread);
2556 if (isCopy != NULL) {
2557 *isCopy = JNI_FALSE;
2558 }
2559 oop a = JNIHandles::resolve_non_null(array);
2560 assert(a->is_array(), "just checking");
2561 BasicType type;
2562 if (a->is_objArray()) {
2563 type = T_OBJECT;
2564 } else {
2565 type = typeArrayKlass::cast(a->klass())->element_type();
2566 }
2567 void* ret = arrayOop(a)->base(type);
2568 DTRACE_PROBE1(hotspot_jni, GetPrimitiveArrayCritical__return, ret);
2569 return ret;
2570 JNI_END
2573 JNI_ENTRY(void, jni_ReleasePrimitiveArrayCritical(JNIEnv *env, jarray array, void *carray, jint mode))
2574 JNIWrapper("ReleasePrimitiveArrayCritical");
2575 DTRACE_PROBE4(hotspot_jni, ReleasePrimitiveArrayCritical__entry, env, array, carray, mode);
2576 // The array, carray and mode arguments are ignored
2577 GC_locker::unlock_critical(thread);
2578 DTRACE_PROBE(hotspot_jni, ReleasePrimitiveArrayCritical__return);
2579 JNI_END
2582 JNI_ENTRY(const jchar*, jni_GetStringCritical(JNIEnv *env, jstring string, jboolean *isCopy))
2583 JNIWrapper("GetStringCritical");
2584 DTRACE_PROBE3(hotspot_jni, GetStringCritical__entry, env, string, isCopy);
2585 GC_locker::lock_critical(thread);
2586 if (isCopy != NULL) {
2587 *isCopy = JNI_FALSE;
2588 }
2589 oop s = JNIHandles::resolve_non_null(string);
2590 int s_len = java_lang_String::length(s);
2591 typeArrayOop s_value = java_lang_String::value(s);
2592 int s_offset = java_lang_String::offset(s);
2593 const jchar* ret;
2594 if (s_len > 0) {
2595 ret = s_value->char_at_addr(s_offset);
2596 } else {
2597 ret = (jchar*) s_value->base(T_CHAR);
2598 }
2599 DTRACE_PROBE1(hotspot_jni, GetStringCritical__return, ret);
2600 return ret;
2601 JNI_END
2604 JNI_ENTRY(void, jni_ReleaseStringCritical(JNIEnv *env, jstring str, const jchar *chars))
2605 JNIWrapper("ReleaseStringCritical");
2606 DTRACE_PROBE3(hotspot_jni, ReleaseStringCritical__entry, env, str, chars);
2607 // The str and chars arguments are ignored
2608 GC_locker::unlock_critical(thread);
2609 DTRACE_PROBE(hotspot_jni, ReleaseStringCritical__return);
2610 JNI_END
2613 JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref))
2614 JNIWrapper("jni_NewWeakGlobalRef");
2615 DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref);
2616 Handle ref_handle(thread, JNIHandles::resolve(ref));
2617 jweak ret = JNIHandles::make_weak_global(ref_handle);
2618 DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret);
2619 return ret;
2620 JNI_END
2622 // Must be JNI_ENTRY (with HandleMark)
2623 JNI_ENTRY(void, jni_DeleteWeakGlobalRef(JNIEnv *env, jweak ref))
2624 JNIWrapper("jni_DeleteWeakGlobalRef");
2625 DTRACE_PROBE2(hotspot_jni, DeleteWeakGlobalRef__entry, env, ref);
2626 JNIHandles::destroy_weak_global(ref);
2627 DTRACE_PROBE(hotspot_jni, DeleteWeakGlobalRef__return);
2628 JNI_END
2631 JNI_QUICK_ENTRY(jboolean, jni_ExceptionCheck(JNIEnv *env))
2632 JNIWrapper("jni_ExceptionCheck");
2633 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__entry, env);
2634 jni_check_async_exceptions(thread);
2635 jboolean ret = (thread->has_pending_exception()) ? JNI_TRUE : JNI_FALSE;
2636 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__return, ret);
2637 return ret;
2638 JNI_END
2641 // Initialization state for three routines below relating to
2642 // java.nio.DirectBuffers
2643 static jint directBufferSupportInitializeStarted = 0;
2644 static volatile jint directBufferSupportInitializeEnded = 0;
2645 static volatile jint directBufferSupportInitializeFailed = 0;
2646 static jclass bufferClass = NULL;
2647 static jclass directBufferClass = NULL;
2648 static jclass directByteBufferClass = NULL;
2649 static jmethodID directByteBufferConstructor = NULL;
2650 static jfieldID directBufferAddressField = NULL;
2651 static jfieldID bufferCapacityField = NULL;
2653 static jclass lookupOne(JNIEnv* env, const char* name, TRAPS) {
2654 Handle loader; // null (bootstrap) loader
2655 Handle protection_domain; // null protection domain
2657 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
2658 jclass result = find_class_from_class_loader(env, sym, true, loader, protection_domain, true, CHECK_NULL);
2660 if (TraceClassResolution && result != NULL) {
2661 trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
2662 }
2663 return result;
2664 }
2666 // These lookups are done with the NULL (bootstrap) ClassLoader to
2667 // circumvent any security checks that would be done by jni_FindClass.
2668 JNI_ENTRY(bool, lookupDirectBufferClasses(JNIEnv* env))
2669 {
2670 if ((bufferClass = lookupOne(env, "java/nio/Buffer", thread)) == NULL) { return false; }
2671 if ((directBufferClass = lookupOne(env, "sun/nio/ch/DirectBuffer", thread)) == NULL) { return false; }
2672 if ((directByteBufferClass = lookupOne(env, "java/nio/DirectByteBuffer", thread)) == NULL) { return false; }
2673 return true;
2674 }
2675 JNI_END
2678 static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) {
2679 if (directBufferSupportInitializeFailed) {
2680 return false;
2681 }
2683 if (Atomic::cmpxchg(1, &directBufferSupportInitializeStarted, 0) == 0) {
2684 if (!lookupDirectBufferClasses(env)) {
2685 directBufferSupportInitializeFailed = 1;
2686 return false;
2687 }
2689 // Make global references for these
2690 bufferClass = (jclass) env->NewGlobalRef(bufferClass);
2691 directBufferClass = (jclass) env->NewGlobalRef(directBufferClass);
2692 directByteBufferClass = (jclass) env->NewGlobalRef(directByteBufferClass);
2694 // Get needed field and method IDs
2695 directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V");
2696 directBufferAddressField = env->GetFieldID(bufferClass, "address", "J");
2697 bufferCapacityField = env->GetFieldID(bufferClass, "capacity", "I");
2699 if ((directByteBufferConstructor == NULL) ||
2700 (directBufferAddressField == NULL) ||
2701 (bufferCapacityField == NULL)) {
2702 directBufferSupportInitializeFailed = 1;
2703 return false;
2704 }
2706 directBufferSupportInitializeEnded = 1;
2707 } else {
2708 while (!directBufferSupportInitializeEnded && !directBufferSupportInitializeFailed) {
2709 // Set state as yield_all can call os:sleep. On Solaris, yield_all calls
2710 // os::sleep which requires the VM state transition. On other platforms, it
2711 // is not necessary. The following call to change the VM state is purposely
2712 // put inside the loop to avoid potential deadlock when multiple threads
2713 // try to call this method. See 6791815 for more details.
2714 ThreadInVMfromNative tivn(thread);
2715 os::yield_all();
2716 }
2717 }
2719 return !directBufferSupportInitializeFailed;
2720 }
2722 extern "C" jobject JNICALL jni_NewDirectByteBuffer(JNIEnv *env, void* address, jlong capacity)
2723 {
2724 // thread_from_jni_environment() will block if VM is gone.
2725 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2727 JNIWrapper("jni_NewDirectByteBuffer");
2728 DTRACE_PROBE3(hotspot_jni, NewDirectByteBuffer__entry, env, address, capacity);
2730 if (!directBufferSupportInitializeEnded) {
2731 if (!initializeDirectBufferSupport(env, thread)) {
2732 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, NULL);
2733 return NULL;
2734 }
2735 }
2737 // Being paranoid about accidental sign extension on address
2738 jlong addr = (jlong) ((uintptr_t) address);
2739 // NOTE that package-private DirectByteBuffer constructor currently
2740 // takes int capacity
2741 jint cap = (jint) capacity;
2742 jobject ret = env->NewObject(directByteBufferClass, directByteBufferConstructor, addr, cap);
2743 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, ret);
2744 return ret;
2745 }
2747 DT_RETURN_MARK_DECL(GetDirectBufferAddress, void*);
2749 extern "C" void* JNICALL jni_GetDirectBufferAddress(JNIEnv *env, jobject buf)
2750 {
2751 // thread_from_jni_environment() will block if VM is gone.
2752 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2754 JNIWrapper("jni_GetDirectBufferAddress");
2755 DTRACE_PROBE2(hotspot_jni, GetDirectBufferAddress__entry, env, buf);
2756 void* ret = NULL;
2757 DT_RETURN_MARK(GetDirectBufferAddress, void*, (const void*&)ret);
2759 if (!directBufferSupportInitializeEnded) {
2760 if (!initializeDirectBufferSupport(env, thread)) {
2761 return 0;
2762 }
2763 }
2765 if ((buf != NULL) && (!env->IsInstanceOf(buf, directBufferClass))) {
2766 return 0;
2767 }
2769 ret = (void*)(intptr_t)env->GetLongField(buf, directBufferAddressField);
2770 return ret;
2771 }
2773 DT_RETURN_MARK_DECL(GetDirectBufferCapacity, jlong);
2775 extern "C" jlong JNICALL jni_GetDirectBufferCapacity(JNIEnv *env, jobject buf)
2776 {
2777 // thread_from_jni_environment() will block if VM is gone.
2778 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2780 JNIWrapper("jni_GetDirectBufferCapacity");
2781 DTRACE_PROBE2(hotspot_jni, GetDirectBufferCapacity__entry, env, buf);
2782 jlong ret = -1;
2783 DT_RETURN_MARK(GetDirectBufferCapacity, jlong, (const jlong&)ret);
2785 if (!directBufferSupportInitializeEnded) {
2786 if (!initializeDirectBufferSupport(env, thread)) {
2787 ret = 0;
2788 return ret;
2789 }
2790 }
2792 if (buf == NULL) {
2793 return -1;
2794 }
2796 if (!env->IsInstanceOf(buf, directBufferClass)) {
2797 return -1;
2798 }
2800 // NOTE that capacity is currently an int in the implementation
2801 ret = env->GetIntField(buf, bufferCapacityField);
2802 return ret;
2803 }
2806 JNI_LEAF(jint, jni_GetVersion(JNIEnv *env))
2807 JNIWrapper("GetVersion");
2808 DTRACE_PROBE1(hotspot_jni, GetVersion__entry, env);
2809 DTRACE_PROBE1(hotspot_jni, GetVersion__return, CurrentVersion);
2810 return CurrentVersion;
2811 JNI_END
2813 extern struct JavaVM_ main_vm;
2815 JNI_LEAF(jint, jni_GetJavaVM(JNIEnv *env, JavaVM **vm))
2816 JNIWrapper("jni_GetJavaVM");
2817 DTRACE_PROBE2(hotspot_jni, GetJavaVM__entry, env, vm);
2818 *vm = (JavaVM *)(&main_vm);
2819 DTRACE_PROBE1(hotspot_jni, GetJavaVM__return, JNI_OK);
2820 return JNI_OK;
2821 JNI_END
2823 // Structure containing all jni functions
2824 struct JNINativeInterface_ jni_NativeInterface = {
2825 NULL,
2826 NULL,
2827 NULL,
2829 NULL,
2831 jni_GetVersion,
2833 jni_DefineClass,
2834 jni_FindClass,
2836 jni_FromReflectedMethod,
2837 jni_FromReflectedField,
2839 jni_ToReflectedMethod,
2841 jni_GetSuperclass,
2842 jni_IsAssignableFrom,
2844 jni_ToReflectedField,
2846 jni_Throw,
2847 jni_ThrowNew,
2848 jni_ExceptionOccurred,
2849 jni_ExceptionDescribe,
2850 jni_ExceptionClear,
2851 jni_FatalError,
2853 jni_PushLocalFrame,
2854 jni_PopLocalFrame,
2856 jni_NewGlobalRef,
2857 jni_DeleteGlobalRef,
2858 jni_DeleteLocalRef,
2859 jni_IsSameObject,
2861 jni_NewLocalRef,
2862 jni_EnsureLocalCapacity,
2864 jni_AllocObject,
2865 jni_NewObject,
2866 jni_NewObjectV,
2867 jni_NewObjectA,
2869 jni_GetObjectClass,
2870 jni_IsInstanceOf,
2872 jni_GetMethodID,
2874 jni_CallObjectMethod,
2875 jni_CallObjectMethodV,
2876 jni_CallObjectMethodA,
2877 jni_CallBooleanMethod,
2878 jni_CallBooleanMethodV,
2879 jni_CallBooleanMethodA,
2880 jni_CallByteMethod,
2881 jni_CallByteMethodV,
2882 jni_CallByteMethodA,
2883 jni_CallCharMethod,
2884 jni_CallCharMethodV,
2885 jni_CallCharMethodA,
2886 jni_CallShortMethod,
2887 jni_CallShortMethodV,
2888 jni_CallShortMethodA,
2889 jni_CallIntMethod,
2890 jni_CallIntMethodV,
2891 jni_CallIntMethodA,
2892 jni_CallLongMethod,
2893 jni_CallLongMethodV,
2894 jni_CallLongMethodA,
2895 jni_CallFloatMethod,
2896 jni_CallFloatMethodV,
2897 jni_CallFloatMethodA,
2898 jni_CallDoubleMethod,
2899 jni_CallDoubleMethodV,
2900 jni_CallDoubleMethodA,
2901 jni_CallVoidMethod,
2902 jni_CallVoidMethodV,
2903 jni_CallVoidMethodA,
2905 jni_CallNonvirtualObjectMethod,
2906 jni_CallNonvirtualObjectMethodV,
2907 jni_CallNonvirtualObjectMethodA,
2908 jni_CallNonvirtualBooleanMethod,
2909 jni_CallNonvirtualBooleanMethodV,
2910 jni_CallNonvirtualBooleanMethodA,
2911 jni_CallNonvirtualByteMethod,
2912 jni_CallNonvirtualByteMethodV,
2913 jni_CallNonvirtualByteMethodA,
2914 jni_CallNonvirtualCharMethod,
2915 jni_CallNonvirtualCharMethodV,
2916 jni_CallNonvirtualCharMethodA,
2917 jni_CallNonvirtualShortMethod,
2918 jni_CallNonvirtualShortMethodV,
2919 jni_CallNonvirtualShortMethodA,
2920 jni_CallNonvirtualIntMethod,
2921 jni_CallNonvirtualIntMethodV,
2922 jni_CallNonvirtualIntMethodA,
2923 jni_CallNonvirtualLongMethod,
2924 jni_CallNonvirtualLongMethodV,
2925 jni_CallNonvirtualLongMethodA,
2926 jni_CallNonvirtualFloatMethod,
2927 jni_CallNonvirtualFloatMethodV,
2928 jni_CallNonvirtualFloatMethodA,
2929 jni_CallNonvirtualDoubleMethod,
2930 jni_CallNonvirtualDoubleMethodV,
2931 jni_CallNonvirtualDoubleMethodA,
2932 jni_CallNonvirtualVoidMethod,
2933 jni_CallNonvirtualVoidMethodV,
2934 jni_CallNonvirtualVoidMethodA,
2936 jni_GetFieldID,
2938 jni_GetObjectField,
2939 jni_GetBooleanField,
2940 jni_GetByteField,
2941 jni_GetCharField,
2942 jni_GetShortField,
2943 jni_GetIntField,
2944 jni_GetLongField,
2945 jni_GetFloatField,
2946 jni_GetDoubleField,
2948 jni_SetObjectField,
2949 jni_SetBooleanField,
2950 jni_SetByteField,
2951 jni_SetCharField,
2952 jni_SetShortField,
2953 jni_SetIntField,
2954 jni_SetLongField,
2955 jni_SetFloatField,
2956 jni_SetDoubleField,
2958 jni_GetStaticMethodID,
2960 jni_CallStaticObjectMethod,
2961 jni_CallStaticObjectMethodV,
2962 jni_CallStaticObjectMethodA,
2963 jni_CallStaticBooleanMethod,
2964 jni_CallStaticBooleanMethodV,
2965 jni_CallStaticBooleanMethodA,
2966 jni_CallStaticByteMethod,
2967 jni_CallStaticByteMethodV,
2968 jni_CallStaticByteMethodA,
2969 jni_CallStaticCharMethod,
2970 jni_CallStaticCharMethodV,
2971 jni_CallStaticCharMethodA,
2972 jni_CallStaticShortMethod,
2973 jni_CallStaticShortMethodV,
2974 jni_CallStaticShortMethodA,
2975 jni_CallStaticIntMethod,
2976 jni_CallStaticIntMethodV,
2977 jni_CallStaticIntMethodA,
2978 jni_CallStaticLongMethod,
2979 jni_CallStaticLongMethodV,
2980 jni_CallStaticLongMethodA,
2981 jni_CallStaticFloatMethod,
2982 jni_CallStaticFloatMethodV,
2983 jni_CallStaticFloatMethodA,
2984 jni_CallStaticDoubleMethod,
2985 jni_CallStaticDoubleMethodV,
2986 jni_CallStaticDoubleMethodA,
2987 jni_CallStaticVoidMethod,
2988 jni_CallStaticVoidMethodV,
2989 jni_CallStaticVoidMethodA,
2991 jni_GetStaticFieldID,
2993 jni_GetStaticObjectField,
2994 jni_GetStaticBooleanField,
2995 jni_GetStaticByteField,
2996 jni_GetStaticCharField,
2997 jni_GetStaticShortField,
2998 jni_GetStaticIntField,
2999 jni_GetStaticLongField,
3000 jni_GetStaticFloatField,
3001 jni_GetStaticDoubleField,
3003 jni_SetStaticObjectField,
3004 jni_SetStaticBooleanField,
3005 jni_SetStaticByteField,
3006 jni_SetStaticCharField,
3007 jni_SetStaticShortField,
3008 jni_SetStaticIntField,
3009 jni_SetStaticLongField,
3010 jni_SetStaticFloatField,
3011 jni_SetStaticDoubleField,
3013 jni_NewString,
3014 jni_GetStringLength,
3015 jni_GetStringChars,
3016 jni_ReleaseStringChars,
3018 jni_NewStringUTF,
3019 jni_GetStringUTFLength,
3020 jni_GetStringUTFChars,
3021 jni_ReleaseStringUTFChars,
3023 jni_GetArrayLength,
3025 jni_NewObjectArray,
3026 jni_GetObjectArrayElement,
3027 jni_SetObjectArrayElement,
3029 jni_NewBooleanArray,
3030 jni_NewByteArray,
3031 jni_NewCharArray,
3032 jni_NewShortArray,
3033 jni_NewIntArray,
3034 jni_NewLongArray,
3035 jni_NewFloatArray,
3036 jni_NewDoubleArray,
3038 jni_GetBooleanArrayElements,
3039 jni_GetByteArrayElements,
3040 jni_GetCharArrayElements,
3041 jni_GetShortArrayElements,
3042 jni_GetIntArrayElements,
3043 jni_GetLongArrayElements,
3044 jni_GetFloatArrayElements,
3045 jni_GetDoubleArrayElements,
3047 jni_ReleaseBooleanArrayElements,
3048 jni_ReleaseByteArrayElements,
3049 jni_ReleaseCharArrayElements,
3050 jni_ReleaseShortArrayElements,
3051 jni_ReleaseIntArrayElements,
3052 jni_ReleaseLongArrayElements,
3053 jni_ReleaseFloatArrayElements,
3054 jni_ReleaseDoubleArrayElements,
3056 jni_GetBooleanArrayRegion,
3057 jni_GetByteArrayRegion,
3058 jni_GetCharArrayRegion,
3059 jni_GetShortArrayRegion,
3060 jni_GetIntArrayRegion,
3061 jni_GetLongArrayRegion,
3062 jni_GetFloatArrayRegion,
3063 jni_GetDoubleArrayRegion,
3065 jni_SetBooleanArrayRegion,
3066 jni_SetByteArrayRegion,
3067 jni_SetCharArrayRegion,
3068 jni_SetShortArrayRegion,
3069 jni_SetIntArrayRegion,
3070 jni_SetLongArrayRegion,
3071 jni_SetFloatArrayRegion,
3072 jni_SetDoubleArrayRegion,
3074 jni_RegisterNatives,
3075 jni_UnregisterNatives,
3077 jni_MonitorEnter,
3078 jni_MonitorExit,
3080 jni_GetJavaVM,
3082 jni_GetStringRegion,
3083 jni_GetStringUTFRegion,
3085 jni_GetPrimitiveArrayCritical,
3086 jni_ReleasePrimitiveArrayCritical,
3088 jni_GetStringCritical,
3089 jni_ReleaseStringCritical,
3091 jni_NewWeakGlobalRef,
3092 jni_DeleteWeakGlobalRef,
3094 jni_ExceptionCheck,
3096 jni_NewDirectByteBuffer,
3097 jni_GetDirectBufferAddress,
3098 jni_GetDirectBufferCapacity,
3100 // New 1_6 features
3102 jni_GetObjectRefType
3103 };
3106 // For jvmti use to modify jni function table.
3107 // Java threads in native contiues to run until it is transitioned
3108 // to VM at safepoint. Before the transition or before it is blocked
3109 // for safepoint it may access jni function table. VM could crash if
3110 // any java thread access the jni function table in the middle of memcpy.
3111 // To avoid this each function pointers are copied automically.
3112 void copy_jni_function_table(const struct JNINativeInterface_ *new_jni_NativeInterface) {
3113 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
3114 intptr_t *a = (intptr_t *) jni_functions();
3115 intptr_t *b = (intptr_t *) new_jni_NativeInterface;
3116 for (uint i=0; i < sizeof(struct JNINativeInterface_)/sizeof(void *); i++) {
3117 Atomic::store_ptr(*b++, a++);
3118 }
3119 }
3121 void quicken_jni_functions() {
3122 // Replace Get<Primitive>Field with fast versions
3123 if (UseFastJNIAccessors && !JvmtiExport::can_post_field_access()
3124 && !VerifyJNIFields && !TraceJNICalls && !CountJNICalls && !CheckJNICalls
3125 #if defined(_WINDOWS) && defined(IA32) && defined(COMPILER2)
3126 // windows x86 currently needs SEH wrapper and the gain of the fast
3127 // versions currently isn't certain for server vm on uniprocessor.
3128 && os::is_MP()
3129 #endif
3130 ) {
3131 address func;
3132 func = JNI_FastGetField::generate_fast_get_boolean_field();
3133 if (func != (address)-1) {
3134 jni_NativeInterface.GetBooleanField = (GetBooleanField_t)func;
3135 }
3136 func = JNI_FastGetField::generate_fast_get_byte_field();
3137 if (func != (address)-1) {
3138 jni_NativeInterface.GetByteField = (GetByteField_t)func;
3139 }
3140 func = JNI_FastGetField::generate_fast_get_char_field();
3141 if (func != (address)-1) {
3142 jni_NativeInterface.GetCharField = (GetCharField_t)func;
3143 }
3144 func = JNI_FastGetField::generate_fast_get_short_field();
3145 if (func != (address)-1) {
3146 jni_NativeInterface.GetShortField = (GetShortField_t)func;
3147 }
3148 func = JNI_FastGetField::generate_fast_get_int_field();
3149 if (func != (address)-1) {
3150 jni_NativeInterface.GetIntField = (GetIntField_t)func;
3151 }
3152 func = JNI_FastGetField::generate_fast_get_long_field();
3153 if (func != (address)-1) {
3154 jni_NativeInterface.GetLongField = (GetLongField_t)func;
3155 }
3156 func = JNI_FastGetField::generate_fast_get_float_field();
3157 if (func != (address)-1) {
3158 jni_NativeInterface.GetFloatField = (GetFloatField_t)func;
3159 }
3160 func = JNI_FastGetField::generate_fast_get_double_field();
3161 if (func != (address)-1) {
3162 jni_NativeInterface.GetDoubleField = (GetDoubleField_t)func;
3163 }
3164 }
3165 }
3167 // Returns the function structure
3168 struct JNINativeInterface_* jni_functions() {
3169 #ifndef JNICHECK_KERNEL
3170 if (CheckJNICalls) return jni_functions_check();
3171 #else // JNICHECK_KERNEL
3172 if (CheckJNICalls) warning("-Xcheck:jni is not supported in kernel vm.");
3173 #endif // JNICHECK_KERNEL
3174 return &jni_NativeInterface;
3175 }
3177 // Returns the function structure
3178 struct JNINativeInterface_* jni_functions_nocheck() {
3179 return &jni_NativeInterface;
3180 }
3183 // Invocation API
3186 // Forward declaration
3187 extern const struct JNIInvokeInterface_ jni_InvokeInterface;
3189 // Global invocation API vars
3190 volatile jint vm_created = 0;
3191 // Indicate whether it is safe to recreate VM
3192 volatile jint safe_to_recreate_vm = 1;
3193 struct JavaVM_ main_vm = {&jni_InvokeInterface};
3196 #define JAVASTACKSIZE (400 * 1024) /* Default size of a thread java stack */
3197 #define PROCSTACKSIZE 0 /* 0 means default size in HPI */
3198 enum { VERIFY_NONE, VERIFY_REMOTE, VERIFY_ALL };
3200 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, void*);
3201 DT_RETURN_MARK_DECL(GetDefaultJavaVMInitArgs, jint);
3203 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args_) {
3204 HS_DTRACE_PROBE1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, args_);
3205 JDK1_1InitArgs *args = (JDK1_1InitArgs *)args_;
3206 jint ret = JNI_ERR;
3207 DT_RETURN_MARK(GetDefaultJavaVMInitArgs, jint, (const jint&)ret);
3209 if (Threads::is_supported_jni_version(args->version)) {
3210 ret = JNI_OK;
3211 }
3212 // 1.1 style no longer supported in hotspot.
3213 // According the JNI spec, we should update args->version on return.
3214 // We also use the structure to communicate with launcher about default
3215 // stack size.
3216 if (args->version == JNI_VERSION_1_1) {
3217 args->version = JNI_VERSION_1_2;
3218 // javaStackSize is int in arguments structure
3219 assert(jlong(ThreadStackSize) * K < INT_MAX, "integer overflow");
3220 args->javaStackSize = (jint)(ThreadStackSize * K);
3221 }
3222 return ret;
3223 }
3225 HS_DTRACE_PROBE_DECL3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3226 DT_RETURN_MARK_DECL(CreateJavaVM, jint);
3228 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) {
3229 HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3231 jint result = JNI_ERR;
3232 DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result);
3234 // We're about to use Atomic::xchg for synchronization. Some Zero
3235 // platforms use the GCC builtin __sync_lock_test_and_set for this,
3236 // but __sync_lock_test_and_set is not guaranteed to do what we want
3237 // on all architectures. So we check it works before relying on it.
3238 #if defined(ZERO) && defined(ASSERT)
3239 {
3240 jint a = 0xcafebabe;
3241 jint b = Atomic::xchg(0xdeadbeef, &a);
3242 void *c = &a;
3243 void *d = Atomic::xchg_ptr(&b, &c);
3244 assert(a == (jint) 0xdeadbeef && b == (jint) 0xcafebabe, "Atomic::xchg() works");
3245 assert(c == &b && d == &a, "Atomic::xchg_ptr() works");
3246 }
3247 #endif // ZERO && ASSERT
3249 // At the moment it's only possible to have one Java VM,
3250 // since some of the runtime state is in global variables.
3252 // We cannot use our mutex locks here, since they only work on
3253 // Threads. We do an atomic compare and exchange to ensure only
3254 // one thread can call this method at a time
3256 // We use Atomic::xchg rather than Atomic::add/dec since on some platforms
3257 // the add/dec implementations are dependent on whether we are running
3258 // on a multiprocessor, and at this stage of initialization the os::is_MP
3259 // function used to determine this will always return false. Atomic::xchg
3260 // does not have this problem.
3261 if (Atomic::xchg(1, &vm_created) == 1) {
3262 return JNI_ERR; // already created, or create attempt in progress
3263 }
3264 if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) {
3265 return JNI_ERR; // someone tried and failed and retry not allowed.
3266 }
3268 assert(vm_created == 1, "vm_created is true during the creation");
3270 /**
3271 * Certain errors during initialization are recoverable and do not
3272 * prevent this method from being called again at a later time
3273 * (perhaps with different arguments). However, at a certain
3274 * point during initialization if an error occurs we cannot allow
3275 * this function to be called again (or it will crash). In those
3276 * situations, the 'canTryAgain' flag is set to false, which atomically
3277 * sets safe_to_recreate_vm to 1, such that any new call to
3278 * JNI_CreateJavaVM will immediately fail using the above logic.
3279 */
3280 bool can_try_again = true;
3282 result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again);
3283 if (result == JNI_OK) {
3284 JavaThread *thread = JavaThread::current();
3285 /* thread is thread_in_vm here */
3286 *vm = (JavaVM *)(&main_vm);
3287 *(JNIEnv**)penv = thread->jni_environment();
3289 // Tracks the time application was running before GC
3290 RuntimeService::record_application_start();
3292 // Notify JVMTI
3293 if (JvmtiExport::should_post_thread_life()) {
3294 JvmtiExport::post_thread_start(thread);
3295 }
3296 // Check if we should compile all classes on bootclasspath
3297 NOT_PRODUCT(if (CompileTheWorld) ClassLoader::compile_the_world();)
3298 // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving.
3299 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3300 } else {
3301 if (can_try_again) {
3302 // reset safe_to_recreate_vm to 1 so that retrial would be possible
3303 safe_to_recreate_vm = 1;
3304 }
3306 // Creation failed. We must reset vm_created
3307 *vm = 0;
3308 *(JNIEnv**)penv = 0;
3309 // reset vm_created last to avoid race condition. Use OrderAccess to
3310 // control both compiler and architectural-based reordering.
3311 OrderAccess::release_store(&vm_created, 0);
3312 }
3314 return result;
3315 }
3317 HS_DTRACE_PROBE_DECL3(hotspot_jni, GetCreatedJavaVMs__entry, \
3318 JavaVM**, jsize, jsize*);
3319 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetCreatedJavaVMs__return, jint);
3321 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vm_buf, jsize bufLen, jsize *numVMs) {
3322 // See bug 4367188, the wrapper can sometimes cause VM crashes
3323 // JNIWrapper("GetCreatedJavaVMs");
3324 HS_DTRACE_PROBE3(hotspot_jni, GetCreatedJavaVMs__entry, \
3325 vm_buf, bufLen, numVMs);
3326 if (vm_created) {
3327 if (numVMs != NULL) *numVMs = 1;
3328 if (bufLen > 0) *vm_buf = (JavaVM *)(&main_vm);
3329 } else {
3330 if (numVMs != NULL) *numVMs = 0;
3331 }
3332 HS_DTRACE_PROBE1(hotspot_jni, GetCreatedJavaVMs__return, JNI_OK);
3333 return JNI_OK;
3334 }
3336 extern "C" {
3338 DT_RETURN_MARK_DECL(DestroyJavaVM, jint);
3340 jint JNICALL jni_DestroyJavaVM(JavaVM *vm) {
3341 DTRACE_PROBE1(hotspot_jni, DestroyJavaVM__entry, vm);
3342 jint res = JNI_ERR;
3343 DT_RETURN_MARK(DestroyJavaVM, jint, (const jint&)res);
3345 if (!vm_created) {
3346 res = JNI_ERR;
3347 return res;
3348 }
3350 JNIWrapper("DestroyJavaVM");
3351 JNIEnv *env;
3352 JavaVMAttachArgs destroyargs;
3353 destroyargs.version = CurrentVersion;
3354 destroyargs.name = (char *)"DestroyJavaVM";
3355 destroyargs.group = NULL;
3356 res = vm->AttachCurrentThread((void **)&env, (void *)&destroyargs);
3357 if (res != JNI_OK) {
3358 return res;
3359 }
3361 // Since this is not a JVM_ENTRY we have to set the thread state manually before entering.
3362 JavaThread* thread = JavaThread::current();
3363 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3364 if (Threads::destroy_vm()) {
3365 // Should not change thread state, VM is gone
3366 vm_created = false;
3367 res = JNI_OK;
3368 return res;
3369 } else {
3370 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3371 res = JNI_ERR;
3372 return res;
3373 }
3374 }
3377 static jint attach_current_thread(JavaVM *vm, void **penv, void *_args, bool daemon) {
3378 JavaVMAttachArgs *args = (JavaVMAttachArgs *) _args;
3380 // Check below commented out from JDK1.2fcs as well
3381 /*
3382 if (args && (args->version != JNI_VERSION_1_1 || args->version != JNI_VERSION_1_2)) {
3383 return JNI_EVERSION;
3384 }
3385 */
3387 Thread* t = ThreadLocalStorage::get_thread_slow();
3388 if (t != NULL) {
3389 // If the thread has been attached this operation is a no-op
3390 *(JNIEnv**)penv = ((JavaThread*) t)->jni_environment();
3391 return JNI_OK;
3392 }
3394 // Create a thread and mark it as attaching so it will be skipped by the
3395 // ThreadsListEnumerator - see CR 6404306
3396 JavaThread* thread = new JavaThread(true);
3398 // Set correct safepoint info. The thread is going to call into Java when
3399 // initializing the Java level thread object. Hence, the correct state must
3400 // be set in order for the Safepoint code to deal with it correctly.
3401 thread->set_thread_state(_thread_in_vm);
3402 // Must do this before initialize_thread_local_storage
3403 thread->record_stack_base_and_size();
3405 thread->initialize_thread_local_storage();
3407 if (!os::create_attached_thread(thread)) {
3408 delete thread;
3409 return JNI_ERR;
3410 }
3411 // Enable stack overflow checks
3412 thread->create_stack_guard_pages();
3414 thread->initialize_tlab();
3416 // Crucial that we do not have a safepoint check for this thread, since it has
3417 // not been added to the Thread list yet.
3418 { Threads_lock->lock_without_safepoint_check();
3419 // This must be inside this lock in order to get FullGCALot to work properly, i.e., to
3420 // avoid this thread trying to do a GC before it is added to the thread-list
3421 thread->set_active_handles(JNIHandleBlock::allocate_block());
3422 Threads::add(thread, daemon);
3423 Threads_lock->unlock();
3424 }
3425 // Create thread group and name info from attach arguments
3426 oop group = NULL;
3427 char* thread_name = NULL;
3428 if (args != NULL && Threads::is_supported_jni_version(args->version)) {
3429 group = JNIHandles::resolve(args->group);
3430 thread_name = args->name; // may be NULL
3431 }
3432 if (group == NULL) group = Universe::main_thread_group();
3434 // Create Java level thread object and attach it to this thread
3435 bool attach_failed = false;
3436 {
3437 EXCEPTION_MARK;
3438 HandleMark hm(THREAD);
3439 Handle thread_group(THREAD, group);
3440 thread->allocate_threadObj(thread_group, thread_name, daemon, THREAD);
3441 if (HAS_PENDING_EXCEPTION) {
3442 CLEAR_PENDING_EXCEPTION;
3443 // cleanup outside the handle mark.
3444 attach_failed = true;
3445 }
3446 }
3448 if (attach_failed) {
3449 // Added missing cleanup
3450 thread->cleanup_failed_attach_current_thread();
3451 return JNI_ERR;
3452 }
3454 // mark the thread as no longer attaching
3455 // this uses a fence to push the change through so we don't have
3456 // to regrab the threads_lock
3457 thread->set_attached();
3459 // Set java thread status.
3460 java_lang_Thread::set_thread_status(thread->threadObj(),
3461 java_lang_Thread::RUNNABLE);
3463 // Notify the debugger
3464 if (JvmtiExport::should_post_thread_life()) {
3465 JvmtiExport::post_thread_start(thread);
3466 }
3468 *(JNIEnv**)penv = thread->jni_environment();
3470 // Now leaving the VM, so change thread_state. This is normally automatically taken care
3471 // of in the JVM_ENTRY. But in this situation we have to do it manually. Notice, that by
3472 // using ThreadStateTransition::transition, we do a callback to the safepoint code if
3473 // needed.
3475 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3477 // Perform any platform dependent FPU setup
3478 os::setup_fpu();
3480 return JNI_OK;
3481 }
3484 jint JNICALL jni_AttachCurrentThread(JavaVM *vm, void **penv, void *_args) {
3485 DTRACE_PROBE3(hotspot_jni, AttachCurrentThread__entry, vm, penv, _args);
3486 if (!vm_created) {
3487 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, JNI_ERR);
3488 return JNI_ERR;
3489 }
3491 JNIWrapper("AttachCurrentThread");
3492 jint ret = attach_current_thread(vm, penv, _args, false);
3493 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, ret);
3494 return ret;
3495 }
3498 jint JNICALL jni_DetachCurrentThread(JavaVM *vm) {
3499 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__entry, vm);
3500 VM_Exit::block_if_vm_exited();
3502 JNIWrapper("DetachCurrentThread");
3504 // If the thread has been deattacted the operations is a no-op
3505 if (ThreadLocalStorage::thread() == NULL) {
3506 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3507 return JNI_OK;
3508 }
3510 JavaThread* thread = JavaThread::current();
3511 if (thread->has_last_Java_frame()) {
3512 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_ERR);
3513 // Can't detach a thread that's running java, that can't work.
3514 return JNI_ERR;
3515 }
3517 // Safepoint support. Have to do call-back to safepoint code, if in the
3518 // middel of a safepoint operation
3519 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3521 // XXX: Note that JavaThread::exit() call below removes the guards on the
3522 // stack pages set up via enable_stack_{red,yellow}_zone() calls
3523 // above in jni_AttachCurrentThread. Unfortunately, while the setting
3524 // of the guards is visible in jni_AttachCurrentThread above,
3525 // the removal of the guards is buried below in JavaThread::exit()
3526 // here. The abstraction should be more symmetrically either exposed
3527 // or hidden (e.g. it could probably be hidden in the same
3528 // (platform-dependent) methods where we do alternate stack
3529 // maintenance work?)
3530 thread->exit(false, JavaThread::jni_detach);
3531 delete thread;
3533 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3534 return JNI_OK;
3535 }
3537 DT_RETURN_MARK_DECL(GetEnv, jint);
3539 jint JNICALL jni_GetEnv(JavaVM *vm, void **penv, jint version) {
3540 DTRACE_PROBE3(hotspot_jni, GetEnv__entry, vm, penv, version);
3541 jint ret = JNI_ERR;
3542 DT_RETURN_MARK(GetEnv, jint, (const jint&)ret);
3544 if (!vm_created) {
3545 *penv = NULL;
3546 ret = JNI_EDETACHED;
3547 return ret;
3548 }
3550 if (JvmtiExport::is_jvmti_version(version)) {
3551 ret = JvmtiExport::get_jvmti_interface(vm, penv, version);
3552 return ret;
3553 }
3555 #ifndef JVMPI_VERSION_1
3556 // need these in order to be polite about older agents
3557 #define JVMPI_VERSION_1 ((jint)0x10000001)
3558 #define JVMPI_VERSION_1_1 ((jint)0x10000002)
3559 #define JVMPI_VERSION_1_2 ((jint)0x10000003)
3560 #endif // !JVMPI_VERSION_1
3562 Thread* thread = ThreadLocalStorage::thread();
3563 if (thread != NULL && thread->is_Java_thread()) {
3564 if (Threads::is_supported_jni_version_including_1_1(version)) {
3565 *(JNIEnv**)penv = ((JavaThread*) thread)->jni_environment();
3566 ret = JNI_OK;
3567 return ret;
3569 } else if (version == JVMPI_VERSION_1 ||
3570 version == JVMPI_VERSION_1_1 ||
3571 version == JVMPI_VERSION_1_2) {
3572 tty->print_cr("ERROR: JVMPI, an experimental interface, is no longer supported.");
3573 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3574 ret = JNI_EVERSION;
3575 return ret;
3576 } else if (JvmtiExport::is_jvmdi_version(version)) {
3577 tty->print_cr("FATAL ERROR: JVMDI is no longer supported.");
3578 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3579 ret = JNI_EVERSION;
3580 return ret;
3581 } else {
3582 *penv = NULL;
3583 ret = JNI_EVERSION;
3584 return ret;
3585 }
3586 } else {
3587 *penv = NULL;
3588 ret = JNI_EDETACHED;
3589 return ret;
3590 }
3591 }
3594 jint JNICALL jni_AttachCurrentThreadAsDaemon(JavaVM *vm, void **penv, void *_args) {
3595 DTRACE_PROBE3(hotspot_jni, AttachCurrentThreadAsDaemon__entry, vm, penv, _args);
3596 if (!vm_created) {
3597 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, JNI_ERR);
3598 return JNI_ERR;
3599 }
3601 JNIWrapper("AttachCurrentThreadAsDaemon");
3602 jint ret = attach_current_thread(vm, penv, _args, true);
3603 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, ret);
3604 return ret;
3605 }
3608 } // End extern "C"
3610 const struct JNIInvokeInterface_ jni_InvokeInterface = {
3611 NULL,
3612 NULL,
3613 NULL,
3615 jni_DestroyJavaVM,
3616 jni_AttachCurrentThread,
3617 jni_DetachCurrentThread,
3618 jni_GetEnv,
3619 jni_AttachCurrentThreadAsDaemon
3620 };