Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/prims/jni.cpp@a61af66fc99e
src/share/vm/prims/jni.cpp
Sat, 01 Dec 2007 00:00:00 +0000
- author
- duke
- date
- Sat, 01 Dec 2007 00:00:00 +0000
- changeset 435
- a61af66fc99e
- child 548
- ba764ed4b6f2
- permissions
- -rw-r--r--
Initial load
1 /*
2 * Copyright 1997-2007 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 while (instanceKlass::cast(super_klass)->contains_field_offset(offset)) {
139 field_klass = super_klass; // super contains the field also
140 super_klass = Klass::cast(field_klass)->super();
141 }
142 debug_only(No_Safepoint_Verifier nosafepoint;)
143 uintptr_t klass_hash = field_klass->identity_hash();
144 return ((klass_hash & klass_mask) << klass_shift) | checked_mask_in_place;
145 } else {
146 #if 0
147 #ifndef PRODUCT
148 {
149 ResourceMark rm;
150 warning("VerifyJNIFields: long offset %d in %s", offset, Klass::cast(k)->external_name());
151 }
152 #endif
153 #endif
154 return 0;
155 }
156 }
158 bool jfieldIDWorkaround::klass_hash_ok(klassOop k, jfieldID id) {
159 uintptr_t as_uint = (uintptr_t) id;
160 intptr_t klass_hash = (as_uint >> klass_shift) & klass_mask;
161 do {
162 debug_only(No_Safepoint_Verifier nosafepoint;)
163 // Could use a non-blocking query for identity_hash here...
164 if ((k->identity_hash() & klass_mask) == klass_hash)
165 return true;
166 k = Klass::cast(k)->super();
167 } while (k != NULL);
168 return false;
169 }
171 void jfieldIDWorkaround::verify_instance_jfieldID(klassOop k, jfieldID id) {
172 guarantee(jfieldIDWorkaround::is_instance_jfieldID(k, id), "must be an instance field" );
173 uintptr_t as_uint = (uintptr_t) id;
174 intptr_t offset = raw_instance_offset(id);
175 if (VerifyJNIFields) {
176 if (is_checked_jfieldID(id)) {
177 guarantee(klass_hash_ok(k, id),
178 "Bug in native code: jfieldID class must match object");
179 } else {
180 #if 0
181 #ifndef PRODUCT
182 if (Verbose) {
183 ResourceMark rm;
184 warning("VerifyJNIFields: unverified offset %d for %s", offset, Klass::cast(k)->external_name());
185 }
186 #endif
187 #endif
188 }
189 }
190 guarantee(instanceKlass::cast(k)->contains_field_offset(offset),
191 "Bug in native code: jfieldID offset must address interior of object");
192 }
194 // Pick a reasonable higher bound for local capacity requested
195 // for EnsureLocalCapacity and PushLocalFrame. We don't want it too
196 // high because a test (or very unusual application) may try to allocate
197 // that many handles and run out of swap space. An implementation is
198 // permitted to allocate more handles than the ensured capacity, so this
199 // value is set high enough to prevent compatibility problems.
200 const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K;
203 // Wrapper to trace JNI functions
205 #ifdef ASSERT
206 Histogram* JNIHistogram;
207 static volatile jint JNIHistogram_lock = 0;
209 class JNITraceWrapper : public StackObj {
210 public:
211 JNITraceWrapper(const char* format, ...) {
212 if (TraceJNICalls) {
213 va_list ap;
214 va_start(ap, format);
215 tty->print("JNI ");
216 tty->vprint_cr(format, ap);
217 va_end(ap);
218 }
219 }
220 };
222 class JNIHistogramElement : public HistogramElement {
223 public:
224 JNIHistogramElement(const char* name);
225 };
227 JNIHistogramElement::JNIHistogramElement(const char* elementName) {
228 _name = elementName;
229 uintx count = 0;
231 while (Atomic::cmpxchg(1, &JNIHistogram_lock, 0) != 0) {
232 while (OrderAccess::load_acquire(&JNIHistogram_lock) != 0) {
233 count +=1;
234 if ( (WarnOnStalledSpinLock > 0)
235 && (count % WarnOnStalledSpinLock == 0)) {
236 warning("JNIHistogram_lock seems to be stalled");
237 }
238 }
239 }
242 if(JNIHistogram == NULL)
243 JNIHistogram = new Histogram("JNI Call Counts",100);
245 JNIHistogram->add_element(this);
246 Atomic::dec(&JNIHistogram_lock);
247 }
249 #define JNICountWrapper(arg) \
250 static JNIHistogramElement* e = new JNIHistogramElement(arg); \
251 /* There is a MT-race condition in VC++. So we need to make sure that that e has been initialized */ \
252 if (e != NULL) e->increment_count()
253 #define JNIWrapper(arg) JNICountWrapper(arg); JNITraceWrapper(arg)
254 #else
255 #define JNIWrapper(arg)
256 #endif
259 // Implementation of JNI entries
261 DT_RETURN_MARK_DECL(DefineClass, jclass);
263 JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef,
264 const jbyte *buf, jsize bufLen))
265 JNIWrapper("DefineClass");
267 DTRACE_PROBE5(hotspot_jni, DefineClass__entry,
268 env, name, loaderRef, buf, bufLen);
269 jclass cls = NULL;
270 DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls);
272 // Since exceptions can be thrown, class initialization can take place
273 // if name is NULL no check for class name in .class stream has to be made.
274 symbolHandle class_name;
275 if (name != NULL) {
276 const int str_len = (int)strlen(name);
277 if (str_len > symbolOopDesc::max_length()) {
278 // It's impossible to create this class; the name cannot fit
279 // into the constant pool.
280 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
281 }
282 class_name = oopFactory::new_symbol_handle(name, str_len, CHECK_NULL);
283 }
285 ResourceMark rm(THREAD);
286 ClassFileStream st((u1*) buf, bufLen, NULL);
287 Handle class_loader (THREAD, JNIHandles::resolve(loaderRef));
289 if (UsePerfData && !class_loader.is_null()) {
290 // check whether the current caller thread holds the lock or not.
291 // If not, increment the corresponding counter
292 if (ObjectSynchronizer::
293 query_lock_ownership((JavaThread*)THREAD, class_loader) !=
294 ObjectSynchronizer::owner_self) {
295 ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc();
296 }
297 }
298 klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
299 Handle(), &st, CHECK_NULL);
301 cls = (jclass)JNIHandles::make_local(
302 env, Klass::cast(k)->java_mirror());
303 return cls;
304 JNI_END
308 static bool first_time_FindClass = true;
310 DT_RETURN_MARK_DECL(FindClass, jclass);
312 JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name))
313 JNIWrapper("FindClass");
314 DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name);
316 jclass result = NULL;
317 DT_RETURN_MARK(FindClass, jclass, (const jclass&)result);
319 // Remember if we are the first invocation of jni_FindClass
320 bool first_time = first_time_FindClass;
321 first_time_FindClass = false;
323 // Sanity check the name: it cannot be null or larger than the maximum size
324 // name we can fit in the constant pool.
325 if (name == NULL || (int)strlen(name) > symbolOopDesc::max_length()) {
326 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
327 }
329 //%note jni_3
330 Handle loader;
331 Handle protection_domain;
332 // Find calling class
333 instanceKlassHandle k (THREAD, thread->security_get_caller_class(0));
334 if (k.not_null()) {
335 loader = Handle(THREAD, k->class_loader());
336 // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed
337 // in the correct class context.
338 if (loader.is_null() &&
339 k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
340 JavaValue result(T_OBJECT);
341 JavaCalls::call_static(&result, k,
342 vmSymbolHandles::getFromClass_name(),
343 vmSymbolHandles::void_class_signature(),
344 thread);
345 if (HAS_PENDING_EXCEPTION) {
346 Handle ex(thread, thread->pending_exception());
347 CLEAR_PENDING_EXCEPTION;
348 THROW_HANDLE_0(ex);
349 }
350 oop mirror = (oop) result.get_jobject();
351 loader = Handle(THREAD,
352 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader());
353 protection_domain = Handle(THREAD,
354 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain());
355 }
356 } else {
357 // We call ClassLoader.getSystemClassLoader to obtain the system class loader.
358 loader = Handle(THREAD, SystemDictionary::java_system_loader());
359 }
361 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
362 result = find_class_from_class_loader(env, sym, true, loader,
363 protection_domain, true, thread);
365 // If we were the first invocation of jni_FindClass, we enable compilation again
366 // rather than just allowing invocation counter to overflow and decay.
367 // Controlled by flag DelayCompilationDuringStartup.
368 if (first_time && !CompileTheWorld)
369 CompilationPolicy::completed_vm_startup();
371 return result;
372 JNI_END
374 DT_RETURN_MARK_DECL(FromReflectedMethod, jmethodID);
376 JNI_ENTRY(jmethodID, jni_FromReflectedMethod(JNIEnv *env, jobject method))
377 JNIWrapper("FromReflectedMethod");
378 DTRACE_PROBE2(hotspot_jni, FromReflectedMethod__entry, env, method);
379 jmethodID ret = NULL;
380 DT_RETURN_MARK(FromReflectedMethod, jmethodID, (const jmethodID&)ret);
382 // method is a handle to a java.lang.reflect.Method object
383 oop reflected = JNIHandles::resolve_non_null(method);
384 oop mirror = NULL;
385 int slot = 0;
387 if (reflected->klass() == SystemDictionary::reflect_constructor_klass()) {
388 mirror = java_lang_reflect_Constructor::clazz(reflected);
389 slot = java_lang_reflect_Constructor::slot(reflected);
390 } else {
391 assert(reflected->klass() == SystemDictionary::reflect_method_klass(), "wrong type");
392 mirror = java_lang_reflect_Method::clazz(reflected);
393 slot = java_lang_reflect_Method::slot(reflected);
394 }
395 klassOop k = java_lang_Class::as_klassOop(mirror);
397 KlassHandle k1(THREAD, k);
398 // Make sure class is initialized before handing id's out to methods
399 Klass::cast(k1())->initialize(CHECK_NULL);
400 methodOop m = instanceKlass::cast(k1())->method_with_idnum(slot);
401 ret = m==NULL? NULL : m->jmethod_id(); // return NULL if reflected method deleted
402 return ret;
403 JNI_END
405 DT_RETURN_MARK_DECL(FromReflectedField, jfieldID);
407 JNI_ENTRY(jfieldID, jni_FromReflectedField(JNIEnv *env, jobject field))
408 JNIWrapper("FromReflectedField");
409 DTRACE_PROBE2(hotspot_jni, FromReflectedField__entry, env, field);
410 jfieldID ret = NULL;
411 DT_RETURN_MARK(FromReflectedField, jfieldID, (const jfieldID&)ret);
413 // field is a handle to a java.lang.reflect.Field object
414 oop reflected = JNIHandles::resolve_non_null(field);
415 oop mirror = java_lang_reflect_Field::clazz(reflected);
416 klassOop k = java_lang_Class::as_klassOop(mirror);
417 int slot = java_lang_reflect_Field::slot(reflected);
418 int modifiers = java_lang_reflect_Field::modifiers(reflected);
420 KlassHandle k1(THREAD, k);
421 // Make sure class is initialized before handing id's out to fields
422 Klass::cast(k1())->initialize(CHECK_NULL);
424 // First check if this is a static field
425 if (modifiers & JVM_ACC_STATIC) {
426 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
427 JNIid* id = instanceKlass::cast(k1())->jni_id_for(offset);
428 assert(id != NULL, "corrupt Field object");
429 debug_only(id->set_is_static_field_id();)
430 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
431 ret = jfieldIDWorkaround::to_static_jfieldID(id);
432 return ret;
433 }
435 // The slot is the index of the field description in the field-array
436 // The jfieldID is the offset of the field within the object
437 // It may also have hash bits for k, if VerifyJNIFields is turned on.
438 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
439 assert(instanceKlass::cast(k1())->contains_field_offset(offset), "stay within object");
440 ret = jfieldIDWorkaround::to_instance_jfieldID(k1(), offset);
441 return ret;
442 JNI_END
444 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject);
446 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
447 JNIWrapper("ToReflectedMethod");
448 DTRACE_PROBE4(hotspot_jni, ToReflectedMethod__entry, env, cls, method_id, isStatic);
449 jobject ret = NULL;
450 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
452 methodHandle m (THREAD, JNIHandles::resolve_jmethod_id(method_id));
453 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
454 oop reflection_method;
455 if (m->is_initializer()) {
456 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
457 } else {
458 reflection_method = Reflection::new_method(m, UseNewReflection, false, CHECK_NULL);
459 }
460 ret = JNIHandles::make_local(env, reflection_method);
461 return ret;
462 JNI_END
464 DT_RETURN_MARK_DECL(GetSuperclass, jclass);
466 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
467 JNIWrapper("GetSuperclass");
468 DTRACE_PROBE2(hotspot_jni, GetSuperclass__entry, env, sub);
469 jclass obj = NULL;
470 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
472 oop mirror = JNIHandles::resolve_non_null(sub);
473 // primitive classes return NULL
474 if (java_lang_Class::is_primitive(mirror)) return NULL;
476 // Rules of Class.getSuperClass as implemented by KLass::java_super:
477 // arrays return Object
478 // interfaces return NULL
479 // proper classes return Klass::super()
480 klassOop k = java_lang_Class::as_klassOop(mirror);
481 if (Klass::cast(k)->is_interface()) return NULL;
483 // return mirror for superclass
484 klassOop super = Klass::cast(k)->java_super();
485 // super2 is the value computed by the compiler's getSuperClass intrinsic:
486 debug_only(klassOop super2 = ( Klass::cast(k)->oop_is_javaArray()
487 ? SystemDictionary::object_klass()
488 : Klass::cast(k)->super() ) );
489 assert(super == super2,
490 "java_super computation depends on interface, array, other super");
491 obj = (super == NULL) ? NULL : (jclass) JNIHandles::make_local(Klass::cast(super)->java_mirror());
492 return obj;
493 JNI_END
495 JNI_QUICK_ENTRY(jboolean, jni_IsAssignableFrom(JNIEnv *env, jclass sub, jclass super))
496 JNIWrapper("IsSubclassOf");
497 DTRACE_PROBE3(hotspot_jni, IsAssignableFrom__entry, env, sub, super);
498 oop sub_mirror = JNIHandles::resolve_non_null(sub);
499 oop super_mirror = JNIHandles::resolve_non_null(super);
500 if (java_lang_Class::is_primitive(sub_mirror) ||
501 java_lang_Class::is_primitive(super_mirror)) {
502 jboolean ret = (sub_mirror == super_mirror);
503 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
504 return ret;
505 }
506 klassOop sub_klass = java_lang_Class::as_klassOop(sub_mirror);
507 klassOop super_klass = java_lang_Class::as_klassOop(super_mirror);
508 assert(sub_klass != NULL && super_klass != NULL, "invalid arguments to jni_IsAssignableFrom");
509 jboolean ret = Klass::cast(sub_klass)->is_subtype_of(super_klass) ?
510 JNI_TRUE : JNI_FALSE;
511 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
512 return ret;
513 JNI_END
515 DT_RETURN_MARK_DECL(Throw, jint);
517 JNI_ENTRY(jint, jni_Throw(JNIEnv *env, jthrowable obj))
518 JNIWrapper("Throw");
519 DTRACE_PROBE2(hotspot_jni, Throw__entry, env, obj);
520 jint ret = JNI_OK;
521 DT_RETURN_MARK(Throw, jint, (const jint&)ret);
523 THROW_OOP_(JNIHandles::resolve(obj), JNI_OK);
524 ShouldNotReachHere();
525 JNI_END
527 DT_RETURN_MARK_DECL(ThrowNew, jint);
529 JNI_ENTRY(jint, jni_ThrowNew(JNIEnv *env, jclass clazz, const char *message))
530 JNIWrapper("ThrowNew");
531 DTRACE_PROBE3(hotspot_jni, ThrowNew__entry, env, clazz, message);
532 jint ret = JNI_OK;
533 DT_RETURN_MARK(ThrowNew, jint, (const jint&)ret);
535 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
536 symbolHandle name = symbolHandle(THREAD, k->name());
537 Handle class_loader (THREAD, k->class_loader());
538 Handle protection_domain (THREAD, k->protection_domain());
539 THROW_MSG_LOADER_(name, (char *)message, class_loader, protection_domain, JNI_OK);
540 ShouldNotReachHere();
541 JNI_END
544 // JNI functions only transform a pending async exception to a synchronous
545 // exception in ExceptionOccurred and ExceptionCheck calls, since
546 // delivering an async exception in other places won't change the native
547 // code's control flow and would be harmful when native code further calls
548 // JNI functions with a pending exception. Async exception is also checked
549 // during the call, so ExceptionOccurred/ExceptionCheck won't return
550 // false but deliver the async exception at the very end during
551 // state transition.
553 static void jni_check_async_exceptions(JavaThread *thread) {
554 assert(thread == Thread::current(), "must be itself");
555 thread->check_and_handle_async_exceptions();
556 }
558 JNI_ENTRY_NO_PRESERVE(jthrowable, jni_ExceptionOccurred(JNIEnv *env))
559 JNIWrapper("ExceptionOccurred");
560 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__entry, env);
561 jni_check_async_exceptions(thread);
562 oop exception = thread->pending_exception();
563 jthrowable ret = (jthrowable) JNIHandles::make_local(env, exception);
564 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__return, ret);
565 return ret;
566 JNI_END
569 JNI_ENTRY_NO_PRESERVE(void, jni_ExceptionDescribe(JNIEnv *env))
570 JNIWrapper("ExceptionDescribe");
571 DTRACE_PROBE1(hotspot_jni, ExceptionDescribe__entry, env);
572 if (thread->has_pending_exception()) {
573 Handle ex(thread, thread->pending_exception());
574 thread->clear_pending_exception();
575 if (ex->is_a(SystemDictionary::threaddeath_klass())) {
576 // Don't print anything if we are being killed.
577 } else {
578 jio_fprintf(defaultStream::error_stream(), "Exception ");
579 if (thread != NULL && thread->threadObj() != NULL) {
580 ResourceMark rm(THREAD);
581 jio_fprintf(defaultStream::error_stream(),
582 "in thread \"%s\" ", thread->get_thread_name());
583 }
584 if (ex->is_a(SystemDictionary::throwable_klass())) {
585 JavaValue result(T_VOID);
586 JavaCalls::call_virtual(&result,
587 ex,
588 KlassHandle(THREAD,
589 SystemDictionary::throwable_klass()),
590 vmSymbolHandles::printStackTrace_name(),
591 vmSymbolHandles::void_method_signature(),
592 THREAD);
593 // If an exception is thrown in the call it gets thrown away. Not much
594 // we can do with it. The native code that calls this, does not check
595 // for the exception - hence, it might still be in the thread when DestroyVM gets
596 // called, potentially causing a few asserts to trigger - since no pending exception
597 // is expected.
598 CLEAR_PENDING_EXCEPTION;
599 } else {
600 ResourceMark rm(THREAD);
601 jio_fprintf(defaultStream::error_stream(),
602 ". Uncaught exception of type %s.",
603 Klass::cast(ex->klass())->external_name());
604 }
605 }
606 }
607 DTRACE_PROBE(hotspot_jni, ExceptionDescribe__return);
608 JNI_END
611 JNI_QUICK_ENTRY(void, jni_ExceptionClear(JNIEnv *env))
612 JNIWrapper("ExceptionClear");
613 DTRACE_PROBE1(hotspot_jni, ExceptionClear__entry, env);
615 // The jni code might be using this API to clear java thrown exception.
616 // So just mark jvmti thread exception state as exception caught.
617 JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state();
618 if (state != NULL && state->is_exception_detected()) {
619 state->set_exception_caught();
620 }
621 thread->clear_pending_exception();
622 DTRACE_PROBE(hotspot_jni, ExceptionClear__return);
623 JNI_END
626 JNI_ENTRY(void, jni_FatalError(JNIEnv *env, const char *msg))
627 JNIWrapper("FatalError");
628 DTRACE_PROBE2(hotspot_jni, FatalError__entry, env, msg);
629 tty->print_cr("FATAL ERROR in native method: %s", msg);
630 thread->print_stack();
631 os::abort(false); // Prevent core dump, causes a jck failure.
632 JNI_END
635 JNI_ENTRY(jint, jni_PushLocalFrame(JNIEnv *env, jint capacity))
636 JNIWrapper("PushLocalFrame");
637 DTRACE_PROBE2(hotspot_jni, PushLocalFrame__entry, env, capacity);
638 //%note jni_11
639 if (capacity < 0 && capacity > MAX_REASONABLE_LOCAL_CAPACITY) {
640 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, JNI_ERR);
641 return JNI_ERR;
642 }
643 JNIHandleBlock* old_handles = thread->active_handles();
644 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
645 assert(new_handles != NULL, "should not be NULL");
646 new_handles->set_pop_frame_link(old_handles);
647 thread->set_active_handles(new_handles);
648 jint ret = JNI_OK;
649 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, ret);
650 return ret;
651 JNI_END
654 JNI_ENTRY(jobject, jni_PopLocalFrame(JNIEnv *env, jobject result))
655 JNIWrapper("PopLocalFrame");
656 DTRACE_PROBE2(hotspot_jni, PopLocalFrame__entry, env, result);
657 //%note jni_11
658 Handle result_handle(thread, JNIHandles::resolve(result));
659 JNIHandleBlock* old_handles = thread->active_handles();
660 JNIHandleBlock* new_handles = old_handles->pop_frame_link();
661 if (new_handles != NULL) {
662 // As a sanity check we only release the handle blocks if the pop_frame_link is not NULL.
663 // This way code will still work if PopLocalFrame is called without a corresponding
664 // PushLocalFrame call. Note that we set the pop_frame_link to NULL explicitly, otherwise
665 // the release_block call will release the blocks.
666 thread->set_active_handles(new_handles);
667 old_handles->set_pop_frame_link(NULL); // clear link we won't release new_handles below
668 JNIHandleBlock::release_block(old_handles, thread); // may block
669 result = JNIHandles::make_local(thread, result_handle());
670 }
671 DTRACE_PROBE1(hotspot_jni, PopLocalFrame__return, result);
672 return result;
673 JNI_END
676 JNI_ENTRY(jobject, jni_NewGlobalRef(JNIEnv *env, jobject ref))
677 JNIWrapper("NewGlobalRef");
678 DTRACE_PROBE2(hotspot_jni, NewGlobalRef__entry, env, ref);
679 Handle ref_handle(thread, JNIHandles::resolve(ref));
680 jobject ret = JNIHandles::make_global(ref_handle);
681 DTRACE_PROBE1(hotspot_jni, NewGlobalRef__return, ret);
682 return ret;
683 JNI_END
685 // Must be JNI_ENTRY (with HandleMark)
686 JNI_ENTRY_NO_PRESERVE(void, jni_DeleteGlobalRef(JNIEnv *env, jobject ref))
687 JNIWrapper("DeleteGlobalRef");
688 DTRACE_PROBE2(hotspot_jni, DeleteGlobalRef__entry, env, ref);
689 JNIHandles::destroy_global(ref);
690 DTRACE_PROBE(hotspot_jni, DeleteGlobalRef__return);
691 JNI_END
693 JNI_QUICK_ENTRY(void, jni_DeleteLocalRef(JNIEnv *env, jobject obj))
694 JNIWrapper("DeleteLocalRef");
695 DTRACE_PROBE2(hotspot_jni, DeleteLocalRef__entry, env, obj);
696 JNIHandles::destroy_local(obj);
697 DTRACE_PROBE(hotspot_jni, DeleteLocalRef__return);
698 JNI_END
700 JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2))
701 JNIWrapper("IsSameObject");
702 DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2);
703 oop a = JNIHandles::resolve(r1);
704 oop b = JNIHandles::resolve(r2);
705 jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE;
706 DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret);
707 return ret;
708 JNI_END
711 JNI_ENTRY(jobject, jni_NewLocalRef(JNIEnv *env, jobject ref))
712 JNIWrapper("NewLocalRef");
713 DTRACE_PROBE2(hotspot_jni, NewLocalRef__entry, env, ref);
714 jobject ret = JNIHandles::make_local(env, JNIHandles::resolve(ref));
715 DTRACE_PROBE1(hotspot_jni, NewLocalRef__return, ret);
716 return ret;
717 JNI_END
719 JNI_LEAF(jint, jni_EnsureLocalCapacity(JNIEnv *env, jint capacity))
720 JNIWrapper("EnsureLocalCapacity");
721 DTRACE_PROBE2(hotspot_jni, EnsureLocalCapacity__entry, env, capacity);
722 jint ret;
723 if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) {
724 ret = JNI_OK;
725 } else {
726 ret = JNI_ERR;
727 }
728 DTRACE_PROBE1(hotspot_jni, EnsureLocalCapacity__return, ret);
729 return ret;
730 JNI_END
732 // Return the Handle Type
733 JNI_LEAF(jobjectRefType, jni_GetObjectRefType(JNIEnv *env, jobject obj))
734 JNIWrapper("GetObjectRefType");
735 DTRACE_PROBE2(hotspot_jni, GetObjectRefType__entry, env, obj);
736 jobjectRefType ret;
737 if (JNIHandles::is_local_handle(thread, obj) ||
738 JNIHandles::is_frame_handle(thread, obj))
739 ret = JNILocalRefType;
740 else if (JNIHandles::is_global_handle(obj))
741 ret = JNIGlobalRefType;
742 else if (JNIHandles::is_weak_global_handle(obj))
743 ret = JNIWeakGlobalRefType;
744 else
745 ret = JNIInvalidRefType;
746 DTRACE_PROBE1(hotspot_jni, GetObjectRefType__return, ret);
747 return ret;
748 JNI_END
751 class JNI_ArgumentPusher : public SignatureIterator {
752 protected:
753 JavaCallArguments* _arguments;
755 virtual void get_bool () = 0;
756 virtual void get_char () = 0;
757 virtual void get_short () = 0;
758 virtual void get_byte () = 0;
759 virtual void get_int () = 0;
760 virtual void get_long () = 0;
761 virtual void get_float () = 0;
762 virtual void get_double () = 0;
763 virtual void get_object () = 0;
765 JNI_ArgumentPusher(Thread *thread, symbolOop signature)
766 : SignatureIterator(thread, signature) {
767 this->_return_type = T_ILLEGAL;
768 _arguments = NULL;
769 }
771 public:
772 virtual void iterate( uint64_t fingerprint ) = 0;
774 void set_java_argument_object(JavaCallArguments *arguments) { _arguments = arguments; }
776 inline void do_bool() { if (!is_return_type()) get_bool(); }
777 inline void do_char() { if (!is_return_type()) get_char(); }
778 inline void do_short() { if (!is_return_type()) get_short(); }
779 inline void do_byte() { if (!is_return_type()) get_byte(); }
780 inline void do_int() { if (!is_return_type()) get_int(); }
781 inline void do_long() { if (!is_return_type()) get_long(); }
782 inline void do_float() { if (!is_return_type()) get_float(); }
783 inline void do_double() { if (!is_return_type()) get_double(); }
784 inline void do_object(int begin, int end) { if (!is_return_type()) get_object(); }
785 inline void do_array(int begin, int end) { if (!is_return_type()) get_object(); } // do_array uses get_object -- there is no get_array
786 inline void do_void() { }
788 JavaCallArguments* arguments() { return _arguments; }
789 void push_receiver(Handle h) { _arguments->push_oop(h); }
790 };
793 class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher {
794 protected:
795 va_list _ap;
797 inline void get_bool() { _arguments->push_int(va_arg(_ap, jint)); } // bool is coerced to int when using va_arg
798 inline void get_char() { _arguments->push_int(va_arg(_ap, jint)); } // char is coerced to int when using va_arg
799 inline void get_short() { _arguments->push_int(va_arg(_ap, jint)); } // short is coerced to int when using va_arg
800 inline void get_byte() { _arguments->push_int(va_arg(_ap, jint)); } // byte is coerced to int when using va_arg
801 inline void get_int() { _arguments->push_int(va_arg(_ap, jint)); }
803 // each of these paths is exercized by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
805 inline void get_long() { _arguments->push_long(va_arg(_ap, jlong)); }
806 inline void get_float() { _arguments->push_float((jfloat)va_arg(_ap, jdouble)); } // float is coerced to double w/ va_arg
807 inline void get_double() { _arguments->push_double(va_arg(_ap, jdouble)); }
808 inline void get_object() { jobject l = va_arg(_ap, jobject);
809 _arguments->push_oop(Handle((oop *)l, false)); }
811 inline void set_ap(va_list rap) {
812 #ifdef va_copy
813 va_copy(_ap, rap);
814 #elif defined (__va_copy)
815 __va_copy(_ap, rap);
816 #else
817 _ap = rap;
818 #endif
819 }
821 public:
822 JNI_ArgumentPusherVaArg(Thread *thread, symbolOop signature, va_list rap)
823 : JNI_ArgumentPusher(thread, signature) {
824 set_ap(rap);
825 }
826 JNI_ArgumentPusherVaArg(Thread *thread, jmethodID method_id, va_list rap)
827 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
828 set_ap(rap);
829 }
831 // Optimized path if we have the bitvector form of signature
832 void iterate( uint64_t fingerprint ) {
833 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate();// Must be too many arguments
834 else {
835 _return_type = (BasicType)((fingerprint >> static_feature_size) &
836 result_feature_mask);
838 assert(fingerprint, "Fingerprint should not be 0");
839 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
840 while ( 1 ) {
841 switch ( fingerprint & parameter_feature_mask ) {
842 case bool_parm:
843 case char_parm:
844 case short_parm:
845 case byte_parm:
846 case int_parm:
847 get_int();
848 break;
849 case obj_parm:
850 get_object();
851 break;
852 case long_parm:
853 get_long();
854 break;
855 case float_parm:
856 get_float();
857 break;
858 case double_parm:
859 get_double();
860 break;
861 case done_parm:
862 return;
863 break;
864 default:
865 ShouldNotReachHere();
866 break;
867 }
868 fingerprint >>= parameter_feature_size;
869 }
870 }
871 }
872 };
875 class JNI_ArgumentPusherArray : public JNI_ArgumentPusher {
876 protected:
877 const jvalue *_ap;
879 inline void get_bool() { _arguments->push_int((jint)(_ap++)->z); }
880 inline void get_char() { _arguments->push_int((jint)(_ap++)->c); }
881 inline void get_short() { _arguments->push_int((jint)(_ap++)->s); }
882 inline void get_byte() { _arguments->push_int((jint)(_ap++)->b); }
883 inline void get_int() { _arguments->push_int((jint)(_ap++)->i); }
885 inline void get_long() { _arguments->push_long((_ap++)->j); }
886 inline void get_float() { _arguments->push_float((_ap++)->f); }
887 inline void get_double() { _arguments->push_double((_ap++)->d);}
888 inline void get_object() { _arguments->push_oop(Handle((oop *)(_ap++)->l, false)); }
890 inline void set_ap(const jvalue *rap) { _ap = rap; }
892 public:
893 JNI_ArgumentPusherArray(Thread *thread, symbolOop signature, const jvalue *rap)
894 : JNI_ArgumentPusher(thread, signature) {
895 set_ap(rap);
896 }
897 JNI_ArgumentPusherArray(Thread *thread, jmethodID method_id, const jvalue *rap)
898 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
899 set_ap(rap);
900 }
902 // Optimized path if we have the bitvector form of signature
903 void iterate( uint64_t fingerprint ) {
904 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate(); // Must be too many arguments
905 else {
906 _return_type = (BasicType)((fingerprint >> static_feature_size) &
907 result_feature_mask);
908 assert(fingerprint, "Fingerprint should not be 0");
909 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
910 while ( 1 ) {
911 switch ( fingerprint & parameter_feature_mask ) {
912 case bool_parm:
913 get_bool();
914 break;
915 case char_parm:
916 get_char();
917 break;
918 case short_parm:
919 get_short();
920 break;
921 case byte_parm:
922 get_byte();
923 break;
924 case int_parm:
925 get_int();
926 break;
927 case obj_parm:
928 get_object();
929 break;
930 case long_parm:
931 get_long();
932 break;
933 case float_parm:
934 get_float();
935 break;
936 case double_parm:
937 get_double();
938 break;
939 case done_parm:
940 return;
941 break;
942 default:
943 ShouldNotReachHere();
944 break;
945 }
946 fingerprint >>= parameter_feature_size;
947 }
948 }
949 }
950 };
953 enum JNICallType {
954 JNI_STATIC,
955 JNI_VIRTUAL,
956 JNI_NONVIRTUAL
957 };
959 static methodHandle jni_resolve_interface_call(Handle recv, methodHandle method, TRAPS) {
960 assert(!method.is_null() , "method should not be null");
962 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
963 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
964 KlassHandle spec_klass (THREAD, method->method_holder());
965 symbolHandle name (THREAD, method->name());
966 symbolHandle signature (THREAD, method->signature());
967 CallInfo info;
968 LinkResolver::resolve_interface_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
969 return info.selected_method();
970 }
972 static methodHandle jni_resolve_virtual_call(Handle recv, methodHandle method, TRAPS) {
973 assert(!method.is_null() , "method should not be null");
975 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
976 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
977 KlassHandle spec_klass (THREAD, method->method_holder());
978 symbolHandle name (THREAD, method->name());
979 symbolHandle signature (THREAD, method->signature());
980 CallInfo info;
981 LinkResolver::resolve_virtual_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
982 return info.selected_method();
983 }
987 static void jni_invoke_static(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
988 methodHandle method(THREAD, JNIHandles::resolve_jmethod_id(method_id));
990 // Create object to hold arguments for the JavaCall, and associate it with
991 // the jni parser
992 ResourceMark rm(THREAD);
993 int number_of_parameters = method->size_of_parameters();
994 JavaCallArguments java_args(number_of_parameters);
995 args->set_java_argument_object(&java_args);
997 assert(method->is_static(), "method should be static");
999 // Fill out JavaCallArguments object
1000 args->iterate( Fingerprinter(THREAD, method).fingerprint() );
1001 // Initialize result type
1002 result->set_type(args->get_ret_type());
1004 // Invoke the method. Result is returned as oop.
1005 JavaCalls::call(result, method, &java_args, CHECK);
1007 // Convert result
1008 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1009 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1010 }
1011 }
1014 static void jni_invoke_nonstatic(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
1015 oop recv = JNIHandles::resolve(receiver);
1016 if (recv == NULL) {
1017 THROW(vmSymbols::java_lang_NullPointerException());
1018 }
1019 Handle h_recv(THREAD, recv);
1021 int number_of_parameters;
1022 methodOop selected_method;
1023 {
1024 methodOop m = JNIHandles::resolve_jmethod_id(method_id);
1025 number_of_parameters = m->size_of_parameters();
1026 klassOop holder = m->method_holder();
1027 if (!(Klass::cast(holder))->is_interface()) {
1028 // non-interface call -- for that little speed boost, don't handlize
1029 debug_only(No_Safepoint_Verifier nosafepoint;)
1030 if (call_type == JNI_VIRTUAL) {
1031 // jni_GetMethodID makes sure class is linked and initialized
1032 // so m should have a valid vtable index.
1033 int vtbl_index = m->vtable_index();
1034 if (vtbl_index != methodOopDesc::nonvirtual_vtable_index) {
1035 klassOop k = h_recv->klass();
1036 // k might be an arrayKlassOop but all vtables start at
1037 // the same place. The cast is to avoid virtual call and assertion.
1038 instanceKlass *ik = (instanceKlass*)k->klass_part();
1039 selected_method = ik->method_at_vtable(vtbl_index);
1040 } else {
1041 // final method
1042 selected_method = m;
1043 }
1044 } else {
1045 // JNI_NONVIRTUAL call
1046 selected_method = m;
1047 }
1048 } else {
1049 // interface call
1050 KlassHandle h_holder(THREAD, holder);
1052 int itbl_index = m->cached_itable_index();
1053 if (itbl_index == -1) {
1054 itbl_index = klassItable::compute_itable_index(m);
1055 m->set_cached_itable_index(itbl_index);
1056 // the above may have grabbed a lock, 'm' and anything non-handlized can't be used again
1057 }
1058 klassOop k = h_recv->klass();
1059 selected_method = instanceKlass::cast(k)->method_at_itable(h_holder(), itbl_index, CHECK);
1060 }
1061 }
1063 methodHandle method(THREAD, selected_method);
1065 // Create object to hold arguments for the JavaCall, and associate it with
1066 // the jni parser
1067 ResourceMark rm(THREAD);
1068 JavaCallArguments java_args(number_of_parameters);
1069 args->set_java_argument_object(&java_args);
1071 // handle arguments
1072 assert(!method->is_static(), "method should not be static");
1073 args->push_receiver(h_recv); // Push jobject handle
1075 // Fill out JavaCallArguments object
1076 args->iterate( Fingerprinter(THREAD, method).fingerprint() );
1077 // Initialize result type
1078 result->set_type(args->get_ret_type());
1080 // Invoke the method. Result is returned as oop.
1081 JavaCalls::call(result, method, &java_args, CHECK);
1083 // Convert result
1084 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1085 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1086 }
1087 }
1090 static instanceOop alloc_object(jclass clazz, TRAPS) {
1091 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1092 Klass::cast(k())->check_valid_for_instantiation(false, CHECK_NULL);
1093 instanceKlass::cast(k())->initialize(CHECK_NULL);
1094 instanceOop ih = instanceKlass::cast(k())->allocate_instance(THREAD);
1095 return ih;
1096 }
1098 DT_RETURN_MARK_DECL(AllocObject, jobject);
1100 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
1101 JNIWrapper("AllocObject");
1103 DTRACE_PROBE2(hotspot_jni, AllocObject__entry, env, clazz);
1104 jobject ret = NULL;
1105 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
1107 instanceOop i = alloc_object(clazz, CHECK_NULL);
1108 ret = JNIHandles::make_local(env, i);
1109 return ret;
1110 JNI_END
1112 DT_RETURN_MARK_DECL(NewObjectA, jobject);
1114 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
1115 JNIWrapper("NewObjectA");
1116 DTRACE_PROBE3(hotspot_jni, NewObjectA__entry, env, clazz, methodID);
1117 jobject obj = NULL;
1118 DT_RETURN_MARK(NewObjectA, jobject, (const jobject)obj);
1120 instanceOop i = alloc_object(clazz, CHECK_NULL);
1121 obj = JNIHandles::make_local(env, i);
1122 JavaValue jvalue(T_VOID);
1123 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1124 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1125 return obj;
1126 JNI_END
1128 DT_RETURN_MARK_DECL(NewObjectV, jobject);
1130 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
1131 JNIWrapper("NewObjectV");
1132 DTRACE_PROBE3(hotspot_jni, NewObjectV__entry, env, clazz, methodID);
1133 jobject obj = NULL;
1134 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
1136 instanceOop i = alloc_object(clazz, CHECK_NULL);
1137 obj = JNIHandles::make_local(env, i);
1138 JavaValue jvalue(T_VOID);
1139 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1140 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1141 return obj;
1142 JNI_END
1144 DT_RETURN_MARK_DECL(NewObject, jobject);
1146 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1147 JNIWrapper("NewObject");
1148 DTRACE_PROBE3(hotspot_jni, NewObject__entry, env, clazz, methodID);
1149 jobject obj = NULL;
1150 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1152 instanceOop i = alloc_object(clazz, CHECK_NULL);
1153 obj = JNIHandles::make_local(env, i);
1154 va_list args;
1155 va_start(args, methodID);
1156 JavaValue jvalue(T_VOID);
1157 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1158 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1159 va_end(args);
1160 return obj;
1161 JNI_END
1164 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1165 JNIWrapper("GetObjectClass");
1166 DTRACE_PROBE2(hotspot_jni, GetObjectClass__entry, env, obj);
1167 klassOop k = JNIHandles::resolve_non_null(obj)->klass();
1168 jclass ret =
1169 (jclass) JNIHandles::make_local(env, Klass::cast(k)->java_mirror());
1170 DTRACE_PROBE1(hotspot_jni, GetObjectClass__return, ret);
1171 return ret;
1172 JNI_END
1174 JNI_QUICK_ENTRY(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1175 JNIWrapper("IsInstanceOf");
1176 DTRACE_PROBE3(hotspot_jni, IsInstanceOf__entry, env, obj, clazz);
1177 jboolean ret = JNI_TRUE;
1178 if (obj != NULL) {
1179 ret = JNI_FALSE;
1180 klassOop k = java_lang_Class::as_klassOop(
1181 JNIHandles::resolve_non_null(clazz));
1182 if (k != NULL) {
1183 ret = JNIHandles::resolve_non_null(obj)->is_a(k) ? JNI_TRUE : JNI_FALSE;
1184 }
1185 }
1186 DTRACE_PROBE1(hotspot_jni, IsInstanceOf__return, ret);
1187 return ret;
1188 JNI_END
1191 static jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name_str,
1192 const char *sig, bool is_static, TRAPS) {
1193 // %%%% This code should probably just call into a method in the LinkResolver
1194 //
1195 // The class should have been loaded (we have an instance of the class
1196 // passed in) so the method and signature should already be in the symbol
1197 // table. If they're not there, the method doesn't exist.
1198 symbolHandle signature =
1199 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1200 symbolHandle name;
1201 if (name_str == NULL) {
1202 name = vmSymbolHandles::object_initializer_name();
1203 } else {
1204 name = symbolHandle(THREAD,
1205 SymbolTable::probe(name_str, (int)strlen(name_str)));
1206 }
1207 if (name.is_null() || signature.is_null()) {
1208 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1209 }
1211 // Throw a NoSuchMethodError exception if we have an instance of a
1212 // primitive java.lang.Class
1213 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(clazz))) {
1214 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1215 }
1217 KlassHandle klass(THREAD,
1218 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1220 // Make sure class is linked and initialized before handing id's out to
1221 // methodOops.
1222 Klass::cast(klass())->initialize(CHECK_NULL);
1224 methodOop m;
1225 if (name() == vmSymbols::object_initializer_name() ||
1226 name() == vmSymbols::class_initializer_name()) {
1227 // Never search superclasses for constructors
1228 if (klass->oop_is_instance()) {
1229 m = instanceKlass::cast(klass())->find_method(name(), signature());
1230 } else {
1231 m = NULL;
1232 }
1233 } else {
1234 m = klass->lookup_method(name(), signature());
1235 // Look up interfaces
1236 if (m == NULL && klass->oop_is_instance()) {
1237 m = instanceKlass::cast(klass())->lookup_method_in_all_interfaces(name(),
1238 signature());
1239 }
1240 }
1241 if (m == NULL || (m->is_static() != is_static)) {
1242 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1243 }
1244 return m->jmethod_id();
1245 }
1248 JNI_ENTRY(jmethodID, jni_GetMethodID(JNIEnv *env, jclass clazz,
1249 const char *name, const char *sig))
1250 JNIWrapper("GetMethodID");
1251 DTRACE_PROBE4(hotspot_jni, GetMethodID__entry, env, clazz, name, sig);
1252 jmethodID ret = get_method_id(env, clazz, name, sig, false, thread);
1253 DTRACE_PROBE1(hotspot_jni, GetMethodID__return, ret);
1254 return ret;
1255 JNI_END
1258 JNI_ENTRY(jmethodID, jni_GetStaticMethodID(JNIEnv *env, jclass clazz,
1259 const char *name, const char *sig))
1260 JNIWrapper("GetStaticMethodID");
1261 DTRACE_PROBE4(hotspot_jni, GetStaticMethodID__entry, env, clazz, name, sig);
1262 jmethodID ret = get_method_id(env, clazz, name, sig, true, thread);
1263 DTRACE_PROBE1(hotspot_jni, GetStaticMethodID__return, ret);
1264 return ret;
1265 JNI_END
1269 //
1270 // Calling Methods
1271 //
1274 #define DEFINE_CALLMETHOD(ResultType, Result, Tag) \
1275 \
1276 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##Method, ResultType);\
1277 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodV, ResultType);\
1278 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodA, ResultType);\
1279 \
1280 JNI_ENTRY(ResultType, \
1281 jni_Call##Result##Method(JNIEnv *env, jobject obj, jmethodID methodID, ...)) \
1282 JNIWrapper("Call" XSTR(Result) "Method"); \
1283 \
1284 DTRACE_PROBE3(hotspot_jni, Call##Result##Method__entry, env, obj, methodID);\
1285 ResultType ret = 0;\
1286 DT_RETURN_MARK_FOR(Result, Call##Result##Method, ResultType, \
1287 (const ResultType&)ret);\
1288 \
1289 va_list args; \
1290 va_start(args, methodID); \
1291 JavaValue jvalue(Tag); \
1292 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1293 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1294 va_end(args); \
1295 ret = jvalue.get_##ResultType(); \
1296 return ret;\
1297 JNI_END \
1298 \
1299 \
1300 JNI_ENTRY(ResultType, \
1301 jni_Call##Result##MethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) \
1302 JNIWrapper("Call" XSTR(Result) "MethodV"); \
1303 \
1304 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodV__entry, env, obj, methodID);\
1305 ResultType ret = 0;\
1306 DT_RETURN_MARK_FOR(Result, Call##Result##MethodV, ResultType, \
1307 (const ResultType&)ret);\
1308 \
1309 JavaValue jvalue(Tag); \
1310 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1311 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1312 ret = jvalue.get_##ResultType(); \
1313 return ret;\
1314 JNI_END \
1315 \
1316 \
1317 JNI_ENTRY(ResultType, \
1318 jni_Call##Result##MethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) \
1319 JNIWrapper("Call" XSTR(Result) "MethodA"); \
1320 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodA__entry, env, obj, methodID);\
1321 ResultType ret = 0;\
1322 DT_RETURN_MARK_FOR(Result, Call##Result##MethodA, ResultType, \
1323 (const ResultType&)ret);\
1324 \
1325 JavaValue jvalue(Tag); \
1326 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1327 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1328 ret = jvalue.get_##ResultType(); \
1329 return ret;\
1330 JNI_END
1332 // the runtime type of subword integral basic types is integer
1333 DEFINE_CALLMETHOD(jboolean, Boolean, T_BOOLEAN)
1334 DEFINE_CALLMETHOD(jbyte, Byte, T_BYTE)
1335 DEFINE_CALLMETHOD(jchar, Char, T_CHAR)
1336 DEFINE_CALLMETHOD(jshort, Short, T_SHORT)
1338 DEFINE_CALLMETHOD(jobject, Object, T_OBJECT)
1339 DEFINE_CALLMETHOD(jint, Int, T_INT)
1340 DEFINE_CALLMETHOD(jlong, Long, T_LONG)
1341 DEFINE_CALLMETHOD(jfloat, Float, T_FLOAT)
1342 DEFINE_CALLMETHOD(jdouble, Double, T_DOUBLE)
1344 DT_VOID_RETURN_MARK_DECL(CallVoidMethod);
1345 DT_VOID_RETURN_MARK_DECL(CallVoidMethodV);
1346 DT_VOID_RETURN_MARK_DECL(CallVoidMethodA);
1348 JNI_ENTRY(void, jni_CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...))
1349 JNIWrapper("CallVoidMethod");
1350 DTRACE_PROBE3(hotspot_jni, CallVoidMethod__entry, env, obj, methodID);
1351 DT_VOID_RETURN_MARK(CallVoidMethod);
1353 va_list args;
1354 va_start(args, methodID);
1355 JavaValue jvalue(T_VOID);
1356 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1357 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1358 va_end(args);
1359 JNI_END
1362 JNI_ENTRY(void, jni_CallVoidMethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args))
1363 JNIWrapper("CallVoidMethodV");
1364 DTRACE_PROBE3(hotspot_jni, CallVoidMethodV__entry, env, obj, methodID);
1365 DT_VOID_RETURN_MARK(CallVoidMethodV);
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 JNI_END
1373 JNI_ENTRY(void, jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args))
1374 JNIWrapper("CallVoidMethodA");
1375 DTRACE_PROBE3(hotspot_jni, CallVoidMethodA__entry, env, obj, methodID);
1376 DT_VOID_RETURN_MARK(CallVoidMethodA);
1378 JavaValue jvalue(T_VOID);
1379 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1380 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1381 JNI_END
1384 #define DEFINE_CALLNONVIRTUALMETHOD(ResultType, Result, Tag) \
1385 \
1386 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##Method, ResultType);\
1387 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodV, ResultType);\
1388 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodA, ResultType);\
1389 \
1390 JNI_ENTRY(ResultType, \
1391 jni_CallNonvirtual##Result##Method(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) \
1392 JNIWrapper("CallNonvitual" XSTR(Result) "Method"); \
1393 \
1394 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##Method__entry, env, obj, cls, methodID);\
1395 ResultType ret;\
1396 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##Method, ResultType, \
1397 (const ResultType&)ret);\
1398 \
1399 va_list args; \
1400 va_start(args, methodID); \
1401 JavaValue jvalue(Tag); \
1402 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1403 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1404 va_end(args); \
1405 ret = jvalue.get_##ResultType(); \
1406 return ret;\
1407 JNI_END \
1408 \
1409 JNI_ENTRY(ResultType, \
1410 jni_CallNonvirtual##Result##MethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) \
1411 JNIWrapper("CallNonvitual" XSTR(Result) "#MethodV"); \
1412 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodV__entry, env, obj, cls, methodID);\
1413 ResultType ret;\
1414 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodV, ResultType, \
1415 (const ResultType&)ret);\
1416 \
1417 JavaValue jvalue(Tag); \
1418 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1419 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1420 ret = jvalue.get_##ResultType(); \
1421 return ret;\
1422 JNI_END \
1423 \
1424 JNI_ENTRY(ResultType, \
1425 jni_CallNonvirtual##Result##MethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) \
1426 JNIWrapper("CallNonvitual" XSTR(Result) "MethodA"); \
1427 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodA__entry, env, obj, cls, methodID);\
1428 ResultType ret;\
1429 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodA, ResultType, \
1430 (const ResultType&)ret);\
1431 \
1432 JavaValue jvalue(Tag); \
1433 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1434 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1435 ret = jvalue.get_##ResultType(); \
1436 return ret;\
1437 JNI_END
1439 // the runtime type of subword integral basic types is integer
1440 DEFINE_CALLNONVIRTUALMETHOD(jboolean, Boolean, T_BOOLEAN)
1441 DEFINE_CALLNONVIRTUALMETHOD(jbyte, Byte, T_BYTE)
1442 DEFINE_CALLNONVIRTUALMETHOD(jchar, Char, T_CHAR)
1443 DEFINE_CALLNONVIRTUALMETHOD(jshort, Short, T_SHORT)
1445 DEFINE_CALLNONVIRTUALMETHOD(jobject, Object, T_OBJECT)
1446 DEFINE_CALLNONVIRTUALMETHOD(jint, Int, T_INT)
1447 DEFINE_CALLNONVIRTUALMETHOD(jlong, Long, T_LONG)
1448 DEFINE_CALLNONVIRTUALMETHOD(jfloat, Float, T_FLOAT)
1449 DEFINE_CALLNONVIRTUALMETHOD(jdouble, Double, T_DOUBLE)
1452 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethod);
1453 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodV);
1454 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodA);
1456 JNI_ENTRY(void, jni_CallNonvirtualVoidMethod(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...))
1457 JNIWrapper("CallNonvirtualVoidMethod");
1459 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethod__entry,
1460 env, obj, cls, methodID);
1461 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethod);
1463 va_list args;
1464 va_start(args, methodID);
1465 JavaValue jvalue(T_VOID);
1466 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1467 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1468 va_end(args);
1469 JNI_END
1472 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args))
1473 JNIWrapper("CallNonvirtualVoidMethodV");
1475 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodV__entry,
1476 env, obj, cls, methodID);
1477 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodV);
1479 JavaValue jvalue(T_VOID);
1480 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1481 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1482 JNI_END
1485 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args))
1486 JNIWrapper("CallNonvirtualVoidMethodA");
1487 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodA__entry,
1488 env, obj, cls, methodID);
1489 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodA);
1490 JavaValue jvalue(T_VOID);
1491 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1492 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1493 JNI_END
1496 #define DEFINE_CALLSTATICMETHOD(ResultType, Result, Tag) \
1497 \
1498 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##Method, ResultType);\
1499 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodV, ResultType);\
1500 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodA, ResultType);\
1501 \
1502 JNI_ENTRY(ResultType, \
1503 jni_CallStatic##Result##Method(JNIEnv *env, jclass cls, jmethodID methodID, ...)) \
1504 JNIWrapper("CallStatic" XSTR(Result) "Method"); \
1505 \
1506 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##Method__entry, env, cls, methodID);\
1507 ResultType ret = 0;\
1508 DT_RETURN_MARK_FOR(Result, CallStatic##Result##Method, ResultType, \
1509 (const ResultType&)ret);\
1510 \
1511 va_list args; \
1512 va_start(args, methodID); \
1513 JavaValue jvalue(Tag); \
1514 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1515 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1516 va_end(args); \
1517 ret = jvalue.get_##ResultType(); \
1518 return ret;\
1519 JNI_END \
1520 \
1521 JNI_ENTRY(ResultType, \
1522 jni_CallStatic##Result##MethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) \
1523 JNIWrapper("CallStatic" XSTR(Result) "MethodV"); \
1524 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodV__entry, env, cls, methodID);\
1525 ResultType ret = 0;\
1526 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodV, ResultType, \
1527 (const ResultType&)ret);\
1528 \
1529 JavaValue jvalue(Tag); \
1530 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1531 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1532 ret = jvalue.get_##ResultType(); \
1533 return ret;\
1534 JNI_END \
1535 \
1536 JNI_ENTRY(ResultType, \
1537 jni_CallStatic##Result##MethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) \
1538 JNIWrapper("CallStatic" XSTR(Result) "MethodA"); \
1539 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodA__entry, env, cls, methodID);\
1540 ResultType ret = 0;\
1541 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodA, ResultType, \
1542 (const ResultType&)ret);\
1543 \
1544 JavaValue jvalue(Tag); \
1545 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1546 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1547 ret = jvalue.get_##ResultType(); \
1548 return ret;\
1549 JNI_END
1551 // the runtime type of subword integral basic types is integer
1552 DEFINE_CALLSTATICMETHOD(jboolean, Boolean, T_BOOLEAN)
1553 DEFINE_CALLSTATICMETHOD(jbyte, Byte, T_BYTE)
1554 DEFINE_CALLSTATICMETHOD(jchar, Char, T_CHAR)
1555 DEFINE_CALLSTATICMETHOD(jshort, Short, T_SHORT)
1557 DEFINE_CALLSTATICMETHOD(jobject, Object, T_OBJECT)
1558 DEFINE_CALLSTATICMETHOD(jint, Int, T_INT)
1559 DEFINE_CALLSTATICMETHOD(jlong, Long, T_LONG)
1560 DEFINE_CALLSTATICMETHOD(jfloat, Float, T_FLOAT)
1561 DEFINE_CALLSTATICMETHOD(jdouble, Double, T_DOUBLE)
1564 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethod);
1565 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodV);
1566 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodA);
1568 JNI_ENTRY(void, jni_CallStaticVoidMethod(JNIEnv *env, jclass cls, jmethodID methodID, ...))
1569 JNIWrapper("CallStaticVoidMethod");
1570 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethod__entry, env, cls, methodID);
1571 DT_VOID_RETURN_MARK(CallStaticVoidMethod);
1573 va_list args;
1574 va_start(args, methodID);
1575 JavaValue jvalue(T_VOID);
1576 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1577 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1578 va_end(args);
1579 JNI_END
1582 JNI_ENTRY(void, jni_CallStaticVoidMethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args))
1583 JNIWrapper("CallStaticVoidMethodV");
1584 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodV__entry, env, cls, methodID);
1585 DT_VOID_RETURN_MARK(CallStaticVoidMethodV);
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 JNI_END
1593 JNI_ENTRY(void, jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args))
1594 JNIWrapper("CallStaticVoidMethodA");
1595 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodA__entry, env, cls, methodID);
1596 DT_VOID_RETURN_MARK(CallStaticVoidMethodA);
1598 JavaValue jvalue(T_VOID);
1599 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1600 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1601 JNI_END
1604 //
1605 // Accessing Fields
1606 //
1609 DT_RETURN_MARK_DECL(GetFieldID, jfieldID);
1611 JNI_ENTRY(jfieldID, jni_GetFieldID(JNIEnv *env, jclass clazz,
1612 const char *name, const char *sig))
1613 JNIWrapper("GetFieldID");
1614 DTRACE_PROBE4(hotspot_jni, GetFieldID__entry, env, clazz, name, sig);
1615 jfieldID ret = 0;
1616 DT_RETURN_MARK(GetFieldID, jfieldID, (const jfieldID&)ret);
1618 // The class should have been loaded (we have an instance of the class
1619 // passed in) so the field and signature should already be in the symbol
1620 // table. If they're not there, the field doesn't exist.
1621 symbolHandle fieldname =
1622 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
1623 symbolHandle signame =
1624 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1625 if (fieldname.is_null() || signame.is_null()) {
1626 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1627 }
1628 KlassHandle k(THREAD,
1629 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1630 // Make sure class is initialized before handing id's out to fields
1631 Klass::cast(k())->initialize(CHECK_NULL);
1633 fieldDescriptor fd;
1634 if (!Klass::cast(k())->oop_is_instance() ||
1635 !instanceKlass::cast(k())->find_field(fieldname(), signame(), false, &fd)) {
1636 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1637 }
1639 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1640 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1641 ret = jfieldIDWorkaround::to_instance_jfieldID(k(), fd.offset());
1642 return ret;
1643 JNI_END
1646 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1647 JNIWrapper("GetObjectField");
1648 DTRACE_PROBE3(hotspot_jni, GetObjectField__entry, env, obj, fieldID);
1649 oop o = JNIHandles::resolve_non_null(obj);
1650 klassOop k = o->klass();
1651 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1652 // Keep JVMTI addition small and only check enabled flag here.
1653 // jni_GetField_probe() assumes that is okay to create handles.
1654 if (JvmtiExport::should_post_field_access()) {
1655 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1656 }
1657 jobject ret = JNIHandles::make_local(env, o->obj_field(offset));
1658 DTRACE_PROBE1(hotspot_jni, GetObjectField__return, ret);
1659 return ret;
1660 JNI_END
1663 #define DEFINE_GETFIELD(Return,Fieldname,Result) \
1664 \
1665 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return);\
1666 \
1667 JNI_QUICK_ENTRY(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1668 JNIWrapper("Get" XSTR(Result) "Field"); \
1669 \
1670 DTRACE_PROBE3(hotspot_jni, Get##Result##Field__entry, env, obj, fieldID);\
1671 Return ret = 0;\
1672 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1673 \
1674 oop o = JNIHandles::resolve_non_null(obj); \
1675 klassOop k = o->klass(); \
1676 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1677 /* Keep JVMTI addition small and only check enabled flag here. */ \
1678 /* jni_GetField_probe_nh() assumes that is not okay to create handles */ \
1679 /* and creates a ResetNoHandleMark. */ \
1680 if (JvmtiExport::should_post_field_access()) { \
1681 o = JvmtiExport::jni_GetField_probe_nh(thread, obj, o, k, fieldID, false); \
1682 } \
1683 ret = o->Fieldname##_field(offset); \
1684 return ret; \
1685 JNI_END
1687 DEFINE_GETFIELD(jboolean, bool, Boolean)
1688 DEFINE_GETFIELD(jbyte, byte, Byte)
1689 DEFINE_GETFIELD(jchar, char, Char)
1690 DEFINE_GETFIELD(jshort, short, Short)
1691 DEFINE_GETFIELD(jint, int, Int)
1692 DEFINE_GETFIELD(jlong, long, Long)
1693 DEFINE_GETFIELD(jfloat, float, Float)
1694 DEFINE_GETFIELD(jdouble, double, Double)
1696 address jni_GetBooleanField_addr() {
1697 return (address)jni_GetBooleanField;
1698 }
1699 address jni_GetByteField_addr() {
1700 return (address)jni_GetByteField;
1701 }
1702 address jni_GetCharField_addr() {
1703 return (address)jni_GetCharField;
1704 }
1705 address jni_GetShortField_addr() {
1706 return (address)jni_GetShortField;
1707 }
1708 address jni_GetIntField_addr() {
1709 return (address)jni_GetIntField;
1710 }
1711 address jni_GetLongField_addr() {
1712 return (address)jni_GetLongField;
1713 }
1714 address jni_GetFloatField_addr() {
1715 return (address)jni_GetFloatField;
1716 }
1717 address jni_GetDoubleField_addr() {
1718 return (address)jni_GetDoubleField;
1719 }
1721 JNI_QUICK_ENTRY(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1722 JNIWrapper("SetObjectField");
1723 DTRACE_PROBE4(hotspot_jni, SetObjectField__entry, env, obj, fieldID, value);
1724 oop o = JNIHandles::resolve_non_null(obj);
1725 klassOop k = o->klass();
1726 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1727 // Keep JVMTI addition small and only check enabled flag here.
1728 // jni_SetField_probe_nh() assumes that is not okay to create handles
1729 // and creates a ResetNoHandleMark.
1730 if (JvmtiExport::should_post_field_modification()) {
1731 jvalue field_value;
1732 field_value.l = value;
1733 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, 'L', (jvalue *)&field_value);
1734 }
1735 o->obj_field_put(offset, JNIHandles::resolve(value));
1736 DTRACE_PROBE(hotspot_jni, SetObjectField__return);
1737 JNI_END
1739 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType) \
1740 \
1741 JNI_QUICK_ENTRY(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1742 JNIWrapper("Set" XSTR(Result) "Field"); \
1743 \
1744 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, Set##Result##Field__entry, \
1745 ( JNIEnv*, jobject, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1746 HS_DTRACE_PROBE_N(hotspot_jni, Set##Result##Field__entry, \
1747 ( env, obj, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1748 \
1749 oop o = JNIHandles::resolve_non_null(obj); \
1750 klassOop k = o->klass(); \
1751 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1752 /* Keep JVMTI addition small and only check enabled flag here. */ \
1753 /* jni_SetField_probe_nh() assumes that is not okay to create handles */ \
1754 /* and creates a ResetNoHandleMark. */ \
1755 if (JvmtiExport::should_post_field_modification()) { \
1756 jvalue field_value; \
1757 field_value.unionType = value; \
1758 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \
1759 } \
1760 o->Fieldname##_field_put(offset, value); \
1761 DTRACE_PROBE(hotspot_jni, Set##Result##Field__return);\
1762 JNI_END
1764 DEFINE_SETFIELD(jboolean, bool, Boolean, 'Z', z)
1765 DEFINE_SETFIELD(jbyte, byte, Byte, 'B', b)
1766 DEFINE_SETFIELD(jchar, char, Char, 'C', c)
1767 DEFINE_SETFIELD(jshort, short, Short, 'S', s)
1768 DEFINE_SETFIELD(jint, int, Int, 'I', i)
1769 DEFINE_SETFIELD(jlong, long, Long, 'J', j)
1770 DEFINE_SETFIELD(jfloat, float, Float, 'F', f)
1771 DEFINE_SETFIELD(jdouble, double, Double, 'D', d)
1773 DT_RETURN_MARK_DECL(ToReflectedField, jobject);
1775 JNI_ENTRY(jobject, jni_ToReflectedField(JNIEnv *env, jclass cls, jfieldID fieldID, jboolean isStatic))
1776 JNIWrapper("ToReflectedField");
1777 DTRACE_PROBE4(hotspot_jni, ToReflectedField__entry,
1778 env, cls, fieldID, isStatic);
1779 jobject ret = NULL;
1780 DT_RETURN_MARK(ToReflectedField, jobject, (const jobject&)ret);
1782 fieldDescriptor fd;
1783 bool found = false;
1784 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(cls));
1786 assert(jfieldIDWorkaround::is_static_jfieldID(fieldID) == (isStatic != 0), "invalid fieldID");
1788 if (isStatic) {
1789 // Static field. The fieldID a JNIid specifying the field holder and the offset within the klassOop.
1790 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1791 assert(id->is_static_field_id(), "invalid static field id");
1792 found = instanceKlass::cast(id->holder())->find_local_field_from_offset(id->offset(), true, &fd);
1793 } else {
1794 // Non-static field. The fieldID is really the offset of the field within the instanceOop.
1795 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1796 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, &fd);
1797 }
1798 assert(found, "bad fieldID passed into jni_ToReflectedField");
1799 oop reflected = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
1800 ret = JNIHandles::make_local(env, reflected);
1801 return ret;
1802 JNI_END
1805 //
1806 // Accessing Static Fields
1807 //
1808 DT_RETURN_MARK_DECL(GetStaticFieldID, jfieldID);
1810 JNI_ENTRY(jfieldID, jni_GetStaticFieldID(JNIEnv *env, jclass clazz,
1811 const char *name, const char *sig))
1812 JNIWrapper("GetStaticFieldID");
1813 DTRACE_PROBE4(hotspot_jni, GetStaticFieldID__entry, env, clazz, name, sig);
1814 jfieldID ret = NULL;
1815 DT_RETURN_MARK(GetStaticFieldID, jfieldID, (const jfieldID&)ret);
1817 // The class should have been loaded (we have an instance of the class
1818 // passed in) so the field and signature should already be in the symbol
1819 // table. If they're not there, the field doesn't exist.
1820 symbolHandle fieldname =
1821 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
1822 symbolHandle signame =
1823 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1824 if (fieldname.is_null() || signame.is_null()) {
1825 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1826 }
1827 KlassHandle k(THREAD,
1828 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1829 // Make sure class is initialized before handing id's out to static fields
1830 Klass::cast(k())->initialize(CHECK_NULL);
1832 fieldDescriptor fd;
1833 if (!Klass::cast(k())->oop_is_instance() ||
1834 !instanceKlass::cast(k())->find_field(fieldname(), signame(), true, &fd)) {
1835 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1836 }
1838 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
1839 JNIid* id = instanceKlass::cast(fd.field_holder())->jni_id_for(fd.offset());
1840 debug_only(id->set_is_static_field_id();)
1842 debug_only(int first_offset = instanceKlass::cast(fd.field_holder())->offset_of_static_fields();)
1843 debug_only(int end_offset = first_offset + (instanceKlass::cast(fd.field_holder())->static_field_size() * wordSize);)
1844 assert(id->offset() >= first_offset && id->offset() < end_offset, "invalid static field offset");
1846 ret = jfieldIDWorkaround::to_static_jfieldID(id);
1847 return ret;
1848 JNI_END
1851 JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID))
1852 JNIWrapper("GetStaticObjectField");
1853 DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID);
1854 #ifndef JNICHECK_KERNEL
1855 DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);)
1856 #endif // JNICHECK_KERNEL
1857 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1858 assert(id->is_static_field_id(), "invalid static field id");
1859 // Keep JVMTI addition small and only check enabled flag here.
1860 // jni_GetField_probe() assumes that is okay to create handles.
1861 if (JvmtiExport::should_post_field_access()) {
1862 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true);
1863 }
1864 jobject ret = JNIHandles::make_local(id->holder()->obj_field(id->offset()));
1865 DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret);
1866 return ret;
1867 JNI_END
1869 #define DEFINE_GETSTATICFIELD(Return,Fieldname,Result) \
1870 \
1871 DT_RETURN_MARK_DECL_FOR(Result, GetStatic##Result##Field, Return);\
1872 \
1873 JNI_ENTRY(Return, jni_GetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID)) \
1874 JNIWrapper("GetStatic" XSTR(Result) "Field"); \
1875 DTRACE_PROBE3(hotspot_jni, GetStatic##Result##Field__entry, env, clazz, fieldID);\
1876 Return ret = 0;\
1877 DT_RETURN_MARK_FOR(Result, GetStatic##Result##Field, Return, \
1878 (const Return&)ret);\
1879 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1880 assert(id->is_static_field_id(), "invalid static field id"); \
1881 /* Keep JVMTI addition small and only check enabled flag here. */ \
1882 /* jni_GetField_probe() assumes that is okay to create handles. */ \
1883 if (JvmtiExport::should_post_field_access()) { \
1884 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); \
1885 } \
1886 ret = id->holder()-> Fieldname##_field (id->offset()); \
1887 return ret;\
1888 JNI_END
1890 DEFINE_GETSTATICFIELD(jboolean, bool, Boolean)
1891 DEFINE_GETSTATICFIELD(jbyte, byte, Byte)
1892 DEFINE_GETSTATICFIELD(jchar, char, Char)
1893 DEFINE_GETSTATICFIELD(jshort, short, Short)
1894 DEFINE_GETSTATICFIELD(jint, int, Int)
1895 DEFINE_GETSTATICFIELD(jlong, long, Long)
1896 DEFINE_GETSTATICFIELD(jfloat, float, Float)
1897 DEFINE_GETSTATICFIELD(jdouble, double, Double)
1900 JNI_ENTRY(void, jni_SetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID, jobject value))
1901 JNIWrapper("SetStaticObjectField");
1902 DTRACE_PROBE4(hotspot_jni, SetStaticObjectField__entry, env, clazz, fieldID, value);
1903 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1904 assert(id->is_static_field_id(), "invalid static field id");
1905 // Keep JVMTI addition small and only check enabled flag here.
1906 // jni_SetField_probe() assumes that is okay to create handles.
1907 if (JvmtiExport::should_post_field_modification()) {
1908 jvalue field_value;
1909 field_value.l = value;
1910 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, 'L', (jvalue *)&field_value);
1911 }
1912 id->holder()->obj_field_put(id->offset(), JNIHandles::resolve(value));
1913 DTRACE_PROBE(hotspot_jni, SetStaticObjectField__return);
1914 JNI_END
1917 #define DEFINE_SETSTATICFIELD(Argument,Fieldname,Result,SigType,unionType) \
1918 \
1919 JNI_ENTRY(void, jni_SetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID, Argument value)) \
1920 JNIWrapper("SetStatic" XSTR(Result) "Field"); \
1921 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, SetStatic##Result##Field__entry,\
1922 ( JNIEnv*, jclass, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1923 HS_DTRACE_PROBE_N(hotspot_jni, SetStatic##Result##Field__entry, \
1924 ( env, clazz, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1925 \
1926 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1927 assert(id->is_static_field_id(), "invalid static field id"); \
1928 /* Keep JVMTI addition small and only check enabled flag here. */ \
1929 /* jni_SetField_probe() assumes that is okay to create handles. */ \
1930 if (JvmtiExport::should_post_field_modification()) { \
1931 jvalue field_value; \
1932 field_value.unionType = value; \
1933 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, SigType, (jvalue *)&field_value); \
1934 } \
1935 id->holder()-> Fieldname##_field_put (id->offset(), value); \
1936 DTRACE_PROBE(hotspot_jni, SetStatic##Result##Field__return);\
1937 JNI_END
1939 DEFINE_SETSTATICFIELD(jboolean, bool, Boolean, 'Z', z)
1940 DEFINE_SETSTATICFIELD(jbyte, byte, Byte, 'B', b)
1941 DEFINE_SETSTATICFIELD(jchar, char, Char, 'C', c)
1942 DEFINE_SETSTATICFIELD(jshort, short, Short, 'S', s)
1943 DEFINE_SETSTATICFIELD(jint, int, Int, 'I', i)
1944 DEFINE_SETSTATICFIELD(jlong, long, Long, 'J', j)
1945 DEFINE_SETSTATICFIELD(jfloat, float, Float, 'F', f)
1946 DEFINE_SETSTATICFIELD(jdouble, double, Double, 'D', d)
1949 //
1950 // String Operations
1951 //
1953 // Unicode Interface
1955 DT_RETURN_MARK_DECL(NewString, jstring);
1957 JNI_ENTRY(jstring, jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len))
1958 JNIWrapper("NewString");
1959 DTRACE_PROBE3(hotspot_jni, NewString__entry, env, unicodeChars, len);
1960 jstring ret = NULL;
1961 DT_RETURN_MARK(NewString, jstring, (const jstring&)ret);
1962 oop string=java_lang_String::create_oop_from_unicode((jchar*) unicodeChars, len, CHECK_NULL);
1963 ret = (jstring) JNIHandles::make_local(env, string);
1964 return ret;
1965 JNI_END
1968 JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string))
1969 JNIWrapper("GetStringLength");
1970 DTRACE_PROBE2(hotspot_jni, GetStringLength__entry, env, string);
1971 jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string));
1972 DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret);
1973 return ret;
1974 JNI_END
1977 JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars(
1978 JNIEnv *env, jstring string, jboolean *isCopy))
1979 JNIWrapper("GetStringChars");
1980 DTRACE_PROBE3(hotspot_jni, GetStringChars__entry, env, string, isCopy);
1981 //%note jni_5
1982 if (isCopy != NULL) {
1983 *isCopy = JNI_TRUE;
1984 }
1985 oop s = JNIHandles::resolve_non_null(string);
1986 int s_len = java_lang_String::length(s);
1987 typeArrayOop s_value = java_lang_String::value(s);
1988 int s_offset = java_lang_String::offset(s);
1989 jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1); // add one for zero termination
1990 if (s_len > 0) {
1991 memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len);
1992 }
1993 buf[s_len] = 0;
1994 DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf);
1995 return buf;
1996 JNI_END
1999 JNI_QUICK_ENTRY(void, jni_ReleaseStringChars(JNIEnv *env, jstring str, const jchar *chars))
2000 JNIWrapper("ReleaseStringChars");
2001 DTRACE_PROBE3(hotspot_jni, ReleaseStringChars__entry, env, str, chars);
2002 //%note jni_6
2003 if (chars != NULL) {
2004 // Since String objects are supposed to be immutable, don't copy any
2005 // new data back. A bad user will have to go after the char array.
2006 FreeHeap((void*) chars);
2007 }
2008 DTRACE_PROBE(hotspot_jni, ReleaseStringChars__return);
2009 JNI_END
2012 // UTF Interface
2014 DT_RETURN_MARK_DECL(NewStringUTF, jstring);
2016 JNI_ENTRY(jstring, jni_NewStringUTF(JNIEnv *env, const char *bytes))
2017 JNIWrapper("NewStringUTF");
2018 DTRACE_PROBE2(hotspot_jni, NewStringUTF__entry, env, bytes);
2019 jstring ret;
2020 DT_RETURN_MARK(NewStringUTF, jstring, (const jstring&)ret);
2022 oop result = java_lang_String::create_oop_from_str((char*) bytes, CHECK_NULL);
2023 ret = (jstring) JNIHandles::make_local(env, result);
2024 return ret;
2025 JNI_END
2028 JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string))
2029 JNIWrapper("GetStringUTFLength");
2030 DTRACE_PROBE2(hotspot_jni, GetStringUTFLength__entry, env, string);
2031 jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string));
2032 DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret);
2033 return ret;
2034 JNI_END
2037 JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboolean *isCopy))
2038 JNIWrapper("GetStringUTFChars");
2039 DTRACE_PROBE3(hotspot_jni, GetStringUTFChars__entry, env, string, isCopy);
2040 ResourceMark rm;
2041 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(string));
2042 int length = (int)strlen(str);
2043 char* result = AllocateHeap(length+1, "GetStringUTFChars");
2044 strcpy(result, str);
2045 if (isCopy != NULL) *isCopy = JNI_TRUE;
2046 DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result);
2047 return result;
2048 JNI_END
2051 JNI_LEAF(void, jni_ReleaseStringUTFChars(JNIEnv *env, jstring str, const char *chars))
2052 JNIWrapper("ReleaseStringUTFChars");
2053 DTRACE_PROBE3(hotspot_jni, ReleaseStringUTFChars__entry, env, str, chars);
2054 if (chars != NULL) {
2055 FreeHeap((char*) chars);
2056 }
2057 DTRACE_PROBE(hotspot_jni, ReleaseStringUTFChars__return);
2058 JNI_END
2061 JNI_QUICK_ENTRY(jsize, jni_GetArrayLength(JNIEnv *env, jarray array))
2062 JNIWrapper("GetArrayLength");
2063 DTRACE_PROBE2(hotspot_jni, GetArrayLength__entry, env, array);
2064 arrayOop a = arrayOop(JNIHandles::resolve_non_null(array));
2065 assert(a->is_array(), "must be array");
2066 jsize ret = a->length();
2067 DTRACE_PROBE1(hotspot_jni, GetArrayLength__return, ret);
2068 return ret;
2069 JNI_END
2072 //
2073 // Object Array Operations
2074 //
2076 DT_RETURN_MARK_DECL(NewObjectArray, jobjectArray);
2078 JNI_ENTRY(jobjectArray, jni_NewObjectArray(JNIEnv *env, jsize length, jclass elementClass, jobject initialElement))
2079 JNIWrapper("NewObjectArray");
2080 DTRACE_PROBE4(hotspot_jni, NewObjectArray__entry, env, length, elementClass, initialElement);
2081 jobjectArray ret = NULL;
2082 DT_RETURN_MARK(NewObjectArray, jobjectArray, (const jobjectArray&)ret);
2083 KlassHandle ek(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(elementClass)));
2084 klassOop ako = Klass::cast(ek())->array_klass(CHECK_NULL);
2085 KlassHandle ak = KlassHandle(THREAD, ako);
2086 objArrayKlass::cast(ak())->initialize(CHECK_NULL);
2087 objArrayOop result = objArrayKlass::cast(ak())->allocate(length, CHECK_NULL);
2088 oop initial_value = JNIHandles::resolve(initialElement);
2089 if (initial_value != NULL) { // array already initialized with NULL
2090 for (int index = 0; index < length; index++) {
2091 result->obj_at_put(index, initial_value);
2092 }
2093 }
2094 ret = (jobjectArray) JNIHandles::make_local(env, result);
2095 return ret;
2096 JNI_END
2098 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject);
2100 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2101 JNIWrapper("GetObjectArrayElement");
2102 DTRACE_PROBE3(hotspot_jni, GetObjectArrayElement__entry, env, array, index);
2103 jobject ret = NULL;
2104 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2105 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2106 if (a->is_within_bounds(index)) {
2107 jobject ret = JNIHandles::make_local(env, a->obj_at(index));
2108 return ret;
2109 } else {
2110 char buf[jintAsStringSize];
2111 sprintf(buf, "%d", index);
2112 THROW_MSG_0(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2113 }
2114 JNI_END
2116 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement);
2118 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2119 JNIWrapper("SetObjectArrayElement");
2120 DTRACE_PROBE4(hotspot_jni, SetObjectArrayElement__entry, env, array, index, value);
2121 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2123 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2124 oop v = JNIHandles::resolve(value);
2125 if (a->is_within_bounds(index)) {
2126 if (v == NULL || v->is_a(objArrayKlass::cast(a->klass())->element_klass())) {
2127 a->obj_at_put(index, v);
2128 } else {
2129 THROW(vmSymbols::java_lang_ArrayStoreException());
2130 }
2131 } else {
2132 char buf[jintAsStringSize];
2133 sprintf(buf, "%d", index);
2134 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2135 }
2136 JNI_END
2139 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result) \
2140 \
2141 DT_RETURN_MARK_DECL_FOR(Result, New##Result##Array, Return);\
2142 \
2143 JNI_ENTRY(Return, \
2144 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2145 JNIWrapper("New" XSTR(Result) "Array"); \
2146 DTRACE_PROBE2(hotspot_jni, New##Result##Array__entry, env, len);\
2147 Return ret = NULL;\
2148 DT_RETURN_MARK_FOR(Result, New##Result##Array, Return, (const Return&)ret);\
2149 \
2150 oop obj= oopFactory::Allocator(len, CHECK_0); \
2151 ret = (Return) JNIHandles::make_local(env, obj); \
2152 return ret;\
2153 JNI_END
2155 DEFINE_NEWSCALARARRAY(jbooleanArray, new_boolArray, Boolean)
2156 DEFINE_NEWSCALARARRAY(jbyteArray, new_byteArray, Byte)
2157 DEFINE_NEWSCALARARRAY(jshortArray, new_shortArray, Short)
2158 DEFINE_NEWSCALARARRAY(jcharArray, new_charArray, Char)
2159 DEFINE_NEWSCALARARRAY(jintArray, new_intArray, Int)
2160 DEFINE_NEWSCALARARRAY(jlongArray, new_longArray, Long)
2161 DEFINE_NEWSCALARARRAY(jfloatArray, new_singleArray, Float)
2162 DEFINE_NEWSCALARARRAY(jdoubleArray, new_doubleArray, Double)
2165 // Return an address which will fault if the caller writes to it.
2167 static char* get_bad_address() {
2168 static char* bad_address = NULL;
2169 if (bad_address == NULL) {
2170 size_t size = os::vm_allocation_granularity();
2171 bad_address = os::reserve_memory(size);
2172 if (bad_address != NULL) {
2173 os::commit_memory(bad_address, size);
2174 os::protect_memory(bad_address, size);
2175 }
2176 }
2177 return bad_address;
2178 }
2181 #define DEFINE_GETSCALARARRAYELEMENTS(ElementTag,ElementType,Result, Tag) \
2182 \
2183 JNI_QUICK_ENTRY(ElementType*, \
2184 jni_Get##Result##ArrayElements(JNIEnv *env, ElementType##Array array, jboolean *isCopy)) \
2185 JNIWrapper("Get" XSTR(Result) "ArrayElements"); \
2186 DTRACE_PROBE3(hotspot_jni, Get##Result##ArrayElements__entry, env, array, isCopy);\
2187 /* allocate an chunk of memory in c land */ \
2188 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2189 ElementType* result; \
2190 int len = a->length(); \
2191 if (len == 0) { \
2192 /* Empty array: legal but useless, can't return NULL. \
2193 * Return a pointer to something useless. \
2194 * Avoid asserts in typeArrayOop. */ \
2195 result = (ElementType*)get_bad_address(); \
2196 } else { \
2197 result = NEW_C_HEAP_ARRAY(ElementType, len); \
2198 /* copy the array to the c chunk */ \
2199 memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \
2200 } \
2201 if (isCopy) *isCopy = JNI_TRUE; \
2202 DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\
2203 return result; \
2204 JNI_END
2206 DEFINE_GETSCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2207 DEFINE_GETSCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2208 DEFINE_GETSCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2209 DEFINE_GETSCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2210 DEFINE_GETSCALARARRAYELEMENTS(T_INT, jint, Int, int)
2211 DEFINE_GETSCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2212 DEFINE_GETSCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2213 DEFINE_GETSCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2216 #define DEFINE_RELEASESCALARARRAYELEMENTS(ElementTag,ElementType,Result,Tag) \
2217 \
2218 JNI_QUICK_ENTRY(void, \
2219 jni_Release##Result##ArrayElements(JNIEnv *env, ElementType##Array array, \
2220 ElementType *buf, jint mode)) \
2221 JNIWrapper("Release" XSTR(Result) "ArrayElements"); \
2222 DTRACE_PROBE4(hotspot_jni, Release##Result##ArrayElements__entry, env, array, buf, mode);\
2223 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2224 int len = a->length(); \
2225 if (len != 0) { /* Empty array: nothing to free or copy. */ \
2226 if ((mode == 0) || (mode == JNI_COMMIT)) { \
2227 memcpy(a->Tag##_at_addr(0), buf, sizeof(ElementType)*len); \
2228 } \
2229 if ((mode == 0) || (mode == JNI_ABORT)) { \
2230 FreeHeap(buf); \
2231 } \
2232 } \
2233 DTRACE_PROBE(hotspot_jni, Release##Result##ArrayElements__return);\
2234 JNI_END
2236 DEFINE_RELEASESCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2237 DEFINE_RELEASESCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2238 DEFINE_RELEASESCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2239 DEFINE_RELEASESCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2240 DEFINE_RELEASESCALARARRAYELEMENTS(T_INT, jint, Int, int)
2241 DEFINE_RELEASESCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2242 DEFINE_RELEASESCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2243 DEFINE_RELEASESCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2245 #define DEFINE_GETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2246 DT_VOID_RETURN_MARK_DECL(Get##Result##ArrayRegion);\
2247 \
2248 JNI_ENTRY(void, \
2249 jni_Get##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2250 jsize len, ElementType *buf)) \
2251 JNIWrapper("Get" XSTR(Result) "ArrayRegion"); \
2252 DTRACE_PROBE5(hotspot_jni, Get##Result##ArrayRegion__entry, env, array, start, len, buf);\
2253 DT_VOID_RETURN_MARK(Get##Result##ArrayRegion); \
2254 typeArrayOop src = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2255 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)src->length())) { \
2256 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2257 } else { \
2258 if (len > 0) { \
2259 int sc = typeArrayKlass::cast(src->klass())->log2_element_size(); \
2260 memcpy((u_char*) buf, \
2261 (u_char*) src->Tag##_at_addr(start), \
2262 len << sc); \
2263 } \
2264 } \
2265 JNI_END
2267 DEFINE_GETSCALARARRAYREGION(T_BOOLEAN, jboolean,Boolean, bool)
2268 DEFINE_GETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2269 DEFINE_GETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2270 DEFINE_GETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2271 DEFINE_GETSCALARARRAYREGION(T_INT, jint, Int, int)
2272 DEFINE_GETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2273 DEFINE_GETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2274 DEFINE_GETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2276 #define DEFINE_SETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2277 DT_VOID_RETURN_MARK_DECL(Set##Result##ArrayRegion);\
2278 \
2279 JNI_ENTRY(void, \
2280 jni_Set##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2281 jsize len, const ElementType *buf)) \
2282 JNIWrapper("Set" XSTR(Result) "ArrayRegion"); \
2283 DTRACE_PROBE5(hotspot_jni, Set##Result##ArrayRegion__entry, env, array, start, len, buf);\
2284 DT_VOID_RETURN_MARK(Set##Result##ArrayRegion); \
2285 typeArrayOop dst = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2286 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)dst->length())) { \
2287 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2288 } else { \
2289 if (len > 0) { \
2290 int sc = typeArrayKlass::cast(dst->klass())->log2_element_size(); \
2291 memcpy((u_char*) dst->Tag##_at_addr(start), \
2292 (u_char*) buf, \
2293 len << sc); \
2294 } \
2295 } \
2296 JNI_END
2298 DEFINE_SETSCALARARRAYREGION(T_BOOLEAN, jboolean, Boolean, bool)
2299 DEFINE_SETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2300 DEFINE_SETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2301 DEFINE_SETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2302 DEFINE_SETSCALARARRAYREGION(T_INT, jint, Int, int)
2303 DEFINE_SETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2304 DEFINE_SETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2305 DEFINE_SETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2308 //
2309 // Interception of natives
2310 //
2312 // The RegisterNatives call being attempted tried to register with a method that
2313 // is not native. Ask JVM TI what prefixes have been specified. Then check
2314 // to see if the native method is now wrapped with the prefixes. See the
2315 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
2316 static methodOop find_prefixed_native(KlassHandle k,
2317 symbolHandle name, symbolHandle signature, TRAPS) {
2318 ResourceMark rm(THREAD);
2319 methodOop method;
2320 int name_len = name->utf8_length();
2321 char* name_str = name->as_utf8();
2322 int prefix_count;
2323 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
2324 for (int i = 0; i < prefix_count; i++) {
2325 char* prefix = prefixes[i];
2326 int prefix_len = (int)strlen(prefix);
2328 // try adding this prefix to the method name and see if it matches another method name
2329 int trial_len = name_len + prefix_len;
2330 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
2331 strcpy(trial_name_str, prefix);
2332 strcat(trial_name_str, name_str);
2333 symbolHandle trial_name(THREAD, SymbolTable::probe(trial_name_str, trial_len));
2334 if (trial_name.is_null()) {
2335 continue; // no such symbol, so this prefix wasn't used, try the next prefix
2336 }
2337 method = Klass::cast(k())->lookup_method(trial_name(), signature());
2338 if (method == NULL) {
2339 continue; // signature doesn't match, try the next prefix
2340 }
2341 if (method->is_native()) {
2342 method->set_is_prefixed_native();
2343 return method; // wahoo, we found a prefixed version of the method, return it
2344 }
2345 // found as non-native, so prefix is good, add it, probably just need more prefixes
2346 name_len = trial_len;
2347 name_str = trial_name_str;
2348 }
2349 return NULL; // not found
2350 }
2352 static bool register_native(KlassHandle k, symbolHandle name, symbolHandle signature, address entry, TRAPS) {
2353 methodOop method = Klass::cast(k())->lookup_method(name(), signature());
2354 if (method == NULL) {
2355 ResourceMark rm;
2356 stringStream st;
2357 st.print("Method %s name or signature does not match",
2358 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
2359 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2360 }
2361 if (!method->is_native()) {
2362 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
2363 method = find_prefixed_native(k, name, signature, THREAD);
2364 if (method == NULL) {
2365 ResourceMark rm;
2366 stringStream st;
2367 st.print("Method %s is not declared as native",
2368 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
2369 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2370 }
2371 }
2373 if (entry != NULL) {
2374 method->set_native_function(entry,
2375 methodOopDesc::native_bind_event_is_interesting);
2376 } else {
2377 method->clear_native_function();
2378 }
2379 if (PrintJNIResolving) {
2380 ResourceMark rm(THREAD);
2381 tty->print_cr("[Registering JNI native method %s.%s]",
2382 Klass::cast(method->method_holder())->external_name(),
2383 method->name()->as_C_string());
2384 }
2385 return true;
2386 }
2388 DT_RETURN_MARK_DECL(RegisterNatives, jint);
2390 JNI_ENTRY(jint, jni_RegisterNatives(JNIEnv *env, jclass clazz,
2391 const JNINativeMethod *methods,
2392 jint nMethods))
2393 JNIWrapper("RegisterNatives");
2394 DTRACE_PROBE4(hotspot_jni, RegisterNatives__entry, env, clazz, methods, nMethods);
2395 jint ret = 0;
2396 DT_RETURN_MARK(RegisterNatives, jint, (const jint&)ret);
2398 KlassHandle h_k(thread, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
2400 for (int index = 0; index < nMethods; index++) {
2401 const char* meth_name = methods[index].name;
2402 const char* meth_sig = methods[index].signature;
2403 int meth_name_len = (int)strlen(meth_name);
2405 // The class should have been loaded (we have an instance of the class
2406 // passed in) so the method and signature should already be in the symbol
2407 // table. If they're not there, the method doesn't exist.
2408 symbolHandle name(THREAD, SymbolTable::probe(meth_name, meth_name_len));
2409 symbolHandle signature(THREAD, SymbolTable::probe(meth_sig, (int)strlen(meth_sig)));
2411 if (name.is_null() || signature.is_null()) {
2412 ResourceMark rm;
2413 stringStream st;
2414 st.print("Method %s.%s%s not found", Klass::cast(h_k())->external_name(), meth_name, meth_sig);
2415 // Must return negative value on failure
2416 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), -1);
2417 }
2419 bool res = register_native(h_k, name, signature,
2420 (address) methods[index].fnPtr, THREAD);
2421 if (!res) {
2422 ret = -1;
2423 break;
2424 }
2425 }
2426 return ret;
2427 JNI_END
2430 JNI_ENTRY(jint, jni_UnregisterNatives(JNIEnv *env, jclass clazz))
2431 JNIWrapper("UnregisterNatives");
2432 DTRACE_PROBE2(hotspot_jni, UnregisterNatives__entry, env, clazz);
2433 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz));
2434 //%note jni_2
2435 if (Klass::cast(k)->oop_is_instance()) {
2436 for (int index = 0; index < instanceKlass::cast(k)->methods()->length(); index++) {
2437 methodOop m = methodOop(instanceKlass::cast(k)->methods()->obj_at(index));
2438 if (m->is_native()) {
2439 m->clear_native_function();
2440 m->set_signature_handler(NULL);
2441 }
2442 }
2443 }
2444 DTRACE_PROBE1(hotspot_jni, UnregisterNatives__return, 0);
2445 return 0;
2446 JNI_END
2448 //
2449 // Monitor functions
2450 //
2452 DT_RETURN_MARK_DECL(MonitorEnter, jint);
2454 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2455 DTRACE_PROBE2(hotspot_jni, MonitorEnter__entry, env, jobj);
2456 jint ret = JNI_ERR;
2457 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2459 // If the object is null, we can't do anything with it
2460 if (jobj == NULL) {
2461 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2462 }
2464 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2465 ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR));
2466 ret = JNI_OK;
2467 return ret;
2468 JNI_END
2470 DT_RETURN_MARK_DECL(MonitorExit, jint);
2472 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2473 DTRACE_PROBE2(hotspot_jni, MonitorExit__entry, env, jobj);
2474 jint ret = JNI_ERR;
2475 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2477 // Don't do anything with a null object
2478 if (jobj == NULL) {
2479 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2480 }
2482 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2483 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2485 ret = JNI_OK;
2486 return ret;
2487 JNI_END
2489 //
2490 // Extensions
2491 //
2493 DT_VOID_RETURN_MARK_DECL(GetStringRegion);
2495 JNI_ENTRY(void, jni_GetStringRegion(JNIEnv *env, jstring string, jsize start, jsize len, jchar *buf))
2496 JNIWrapper("GetStringRegion");
2497 DTRACE_PROBE5(hotspot_jni, GetStringRegion__entry, env, string, start, len, buf);
2498 DT_VOID_RETURN_MARK(GetStringRegion);
2499 oop s = JNIHandles::resolve_non_null(string);
2500 int s_len = java_lang_String::length(s);
2501 if (start < 0 || len < 0 || start + len > s_len) {
2502 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2503 } else {
2504 if (len > 0) {
2505 int s_offset = java_lang_String::offset(s);
2506 typeArrayOop s_value = java_lang_String::value(s);
2507 memcpy(buf, s_value->char_at_addr(s_offset+start), sizeof(jchar)*len);
2508 }
2509 }
2510 JNI_END
2512 DT_VOID_RETURN_MARK_DECL(GetStringUTFRegion);
2514 JNI_ENTRY(void, jni_GetStringUTFRegion(JNIEnv *env, jstring string, jsize start, jsize len, char *buf))
2515 JNIWrapper("GetStringUTFRegion");
2516 DTRACE_PROBE5(hotspot_jni, GetStringUTFRegion__entry, env, string, start, len, buf);
2517 DT_VOID_RETURN_MARK(GetStringUTFRegion);
2518 oop s = JNIHandles::resolve_non_null(string);
2519 int s_len = java_lang_String::length(s);
2520 if (start < 0 || len < 0 || start + len > s_len) {
2521 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2522 } else {
2523 //%note jni_7
2524 if (len > 0) {
2525 ResourceMark rm(THREAD);
2526 char *utf_region = java_lang_String::as_utf8_string(s, start, len);
2527 int utf_len = (int)strlen(utf_region);
2528 memcpy(buf, utf_region, utf_len);
2529 buf[utf_len] = 0;
2530 } else {
2531 // JDK null-terminates the buffer even in len is zero
2532 if (buf != NULL) {
2533 buf[0] = 0;
2534 }
2535 }
2536 }
2537 JNI_END
2540 JNI_ENTRY(void*, jni_GetPrimitiveArrayCritical(JNIEnv *env, jarray array, jboolean *isCopy))
2541 JNIWrapper("GetPrimitiveArrayCritical");
2542 DTRACE_PROBE3(hotspot_jni, GetPrimitiveArrayCritical__entry, env, array, isCopy);
2543 GC_locker::lock_critical(thread);
2544 if (isCopy != NULL) {
2545 *isCopy = JNI_FALSE;
2546 }
2547 oop a = JNIHandles::resolve_non_null(array);
2548 assert(a->is_array(), "just checking");
2549 BasicType type;
2550 if (a->is_objArray()) {
2551 type = T_OBJECT;
2552 } else {
2553 type = typeArrayKlass::cast(a->klass())->element_type();
2554 }
2555 void* ret = arrayOop(a)->base(type);
2556 DTRACE_PROBE1(hotspot_jni, GetPrimitiveArrayCritical__return, ret);
2557 return ret;
2558 JNI_END
2561 JNI_ENTRY(void, jni_ReleasePrimitiveArrayCritical(JNIEnv *env, jarray array, void *carray, jint mode))
2562 JNIWrapper("ReleasePrimitiveArrayCritical");
2563 DTRACE_PROBE4(hotspot_jni, ReleasePrimitiveArrayCritical__entry, env, array, carray, mode);
2564 // The array, carray and mode arguments are ignored
2565 GC_locker::unlock_critical(thread);
2566 DTRACE_PROBE(hotspot_jni, ReleasePrimitiveArrayCritical__return);
2567 JNI_END
2570 JNI_ENTRY(const jchar*, jni_GetStringCritical(JNIEnv *env, jstring string, jboolean *isCopy))
2571 JNIWrapper("GetStringCritical");
2572 DTRACE_PROBE3(hotspot_jni, GetStringCritical__entry, env, string, isCopy);
2573 GC_locker::lock_critical(thread);
2574 if (isCopy != NULL) {
2575 *isCopy = JNI_FALSE;
2576 }
2577 oop s = JNIHandles::resolve_non_null(string);
2578 int s_len = java_lang_String::length(s);
2579 typeArrayOop s_value = java_lang_String::value(s);
2580 int s_offset = java_lang_String::offset(s);
2581 const jchar* ret;
2582 if (s_len > 0) {
2583 ret = s_value->char_at_addr(s_offset);
2584 } else {
2585 ret = (jchar*) s_value->base(T_CHAR);
2586 }
2587 DTRACE_PROBE1(hotspot_jni, GetStringCritical__return, ret);
2588 return ret;
2589 JNI_END
2592 JNI_ENTRY(void, jni_ReleaseStringCritical(JNIEnv *env, jstring str, const jchar *chars))
2593 JNIWrapper("ReleaseStringCritical");
2594 DTRACE_PROBE3(hotspot_jni, ReleaseStringCritical__entry, env, str, chars);
2595 // The str and chars arguments are ignored
2596 GC_locker::unlock_critical(thread);
2597 DTRACE_PROBE(hotspot_jni, ReleaseStringCritical__return);
2598 JNI_END
2601 JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref))
2602 JNIWrapper("jni_NewWeakGlobalRef");
2603 DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref);
2604 Handle ref_handle(thread, JNIHandles::resolve(ref));
2605 jweak ret = JNIHandles::make_weak_global(ref_handle);
2606 DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret);
2607 return ret;
2608 JNI_END
2610 // Must be JNI_ENTRY (with HandleMark)
2611 JNI_ENTRY(void, jni_DeleteWeakGlobalRef(JNIEnv *env, jweak ref))
2612 JNIWrapper("jni_DeleteWeakGlobalRef");
2613 DTRACE_PROBE2(hotspot_jni, DeleteWeakGlobalRef__entry, env, ref);
2614 JNIHandles::destroy_weak_global(ref);
2615 DTRACE_PROBE(hotspot_jni, DeleteWeakGlobalRef__return);
2616 JNI_END
2619 JNI_QUICK_ENTRY(jboolean, jni_ExceptionCheck(JNIEnv *env))
2620 JNIWrapper("jni_ExceptionCheck");
2621 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__entry, env);
2622 jni_check_async_exceptions(thread);
2623 jboolean ret = (thread->has_pending_exception()) ? JNI_TRUE : JNI_FALSE;
2624 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__return, ret);
2625 return ret;
2626 JNI_END
2629 // Initialization state for three routines below relating to
2630 // java.nio.DirectBuffers
2631 static jint directBufferSupportInitializeStarted = 0;
2632 static volatile jint directBufferSupportInitializeEnded = 0;
2633 static volatile jint directBufferSupportInitializeFailed = 0;
2634 static jclass bufferClass = NULL;
2635 static jclass directBufferClass = NULL;
2636 static jclass directByteBufferClass = NULL;
2637 static jmethodID directByteBufferConstructor = NULL;
2638 static jfieldID directBufferAddressField = NULL;
2639 static jfieldID bufferCapacityField = NULL;
2641 static jclass lookupOne(JNIEnv* env, const char* name, TRAPS) {
2642 Handle loader; // null (bootstrap) loader
2643 Handle protection_domain; // null protection domain
2645 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
2646 return find_class_from_class_loader(env, sym, true, loader, protection_domain, true, CHECK_NULL);
2647 }
2649 // These lookups are done with the NULL (bootstrap) ClassLoader to
2650 // circumvent any security checks that would be done by jni_FindClass.
2651 JNI_ENTRY(bool, lookupDirectBufferClasses(JNIEnv* env))
2652 {
2653 if ((bufferClass = lookupOne(env, "java/nio/Buffer", thread)) == NULL) { return false; }
2654 if ((directBufferClass = lookupOne(env, "sun/nio/ch/DirectBuffer", thread)) == NULL) { return false; }
2655 if ((directByteBufferClass = lookupOne(env, "java/nio/DirectByteBuffer", thread)) == NULL) { return false; }
2656 return true;
2657 }
2658 JNI_END
2661 static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) {
2662 if (directBufferSupportInitializeFailed) {
2663 return false;
2664 }
2666 if (Atomic::cmpxchg(1, &directBufferSupportInitializeStarted, 0) == 0) {
2667 if (!lookupDirectBufferClasses(env)) {
2668 directBufferSupportInitializeFailed = 1;
2669 return false;
2670 }
2672 // Make global references for these
2673 bufferClass = (jclass) env->NewGlobalRef(bufferClass);
2674 directBufferClass = (jclass) env->NewGlobalRef(directBufferClass);
2675 directByteBufferClass = (jclass) env->NewGlobalRef(directByteBufferClass);
2677 // Get needed field and method IDs
2678 directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V");
2679 directBufferAddressField = env->GetFieldID(bufferClass, "address", "J");
2680 bufferCapacityField = env->GetFieldID(bufferClass, "capacity", "I");
2682 if ((directByteBufferConstructor == NULL) ||
2683 (directBufferAddressField == NULL) ||
2684 (bufferCapacityField == NULL)) {
2685 directBufferSupportInitializeFailed = 1;
2686 return false;
2687 }
2689 directBufferSupportInitializeEnded = 1;
2690 } else {
2691 ThreadInVMfromNative tivn(thread); // set state as yield_all can call os:sleep
2692 while (!directBufferSupportInitializeEnded && !directBufferSupportInitializeFailed) {
2693 os::yield_all();
2694 }
2695 }
2697 return !directBufferSupportInitializeFailed;
2698 }
2700 extern "C" jobject JNICALL jni_NewDirectByteBuffer(JNIEnv *env, void* address, jlong capacity)
2701 {
2702 // thread_from_jni_environment() will block if VM is gone.
2703 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2705 JNIWrapper("jni_NewDirectByteBuffer");
2706 DTRACE_PROBE3(hotspot_jni, NewDirectByteBuffer__entry, env, address, capacity);
2708 if (!directBufferSupportInitializeEnded) {
2709 if (!initializeDirectBufferSupport(env, thread)) {
2710 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, NULL);
2711 return NULL;
2712 }
2713 }
2715 // Being paranoid about accidental sign extension on address
2716 jlong addr = (jlong) ((uintptr_t) address);
2717 // NOTE that package-private DirectByteBuffer constructor currently
2718 // takes int capacity
2719 jint cap = (jint) capacity;
2720 jobject ret = env->NewObject(directByteBufferClass, directByteBufferConstructor, addr, cap);
2721 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, ret);
2722 return ret;
2723 }
2725 DT_RETURN_MARK_DECL(GetDirectBufferAddress, void*);
2727 extern "C" void* JNICALL jni_GetDirectBufferAddress(JNIEnv *env, jobject buf)
2728 {
2729 // thread_from_jni_environment() will block if VM is gone.
2730 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2732 JNIWrapper("jni_GetDirectBufferAddress");
2733 DTRACE_PROBE2(hotspot_jni, GetDirectBufferAddress__entry, env, buf);
2734 void* ret = NULL;
2735 DT_RETURN_MARK(GetDirectBufferAddress, void*, (const void*&)ret);
2737 if (!directBufferSupportInitializeEnded) {
2738 if (!initializeDirectBufferSupport(env, thread)) {
2739 return 0;
2740 }
2741 }
2743 if ((buf != NULL) && (!env->IsInstanceOf(buf, directBufferClass))) {
2744 return 0;
2745 }
2747 ret = (void*)(intptr_t)env->GetLongField(buf, directBufferAddressField);
2748 return ret;
2749 }
2751 DT_RETURN_MARK_DECL(GetDirectBufferCapacity, jlong);
2753 extern "C" jlong JNICALL jni_GetDirectBufferCapacity(JNIEnv *env, jobject buf)
2754 {
2755 // thread_from_jni_environment() will block if VM is gone.
2756 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2758 JNIWrapper("jni_GetDirectBufferCapacity");
2759 DTRACE_PROBE2(hotspot_jni, GetDirectBufferCapacity__entry, env, buf);
2760 jlong ret = -1;
2761 DT_RETURN_MARK(GetDirectBufferCapacity, jlong, (const jlong&)ret);
2763 if (!directBufferSupportInitializeEnded) {
2764 if (!initializeDirectBufferSupport(env, thread)) {
2765 ret = 0;
2766 return ret;
2767 }
2768 }
2770 if (buf == NULL) {
2771 return -1;
2772 }
2774 if (!env->IsInstanceOf(buf, directBufferClass)) {
2775 return -1;
2776 }
2778 // NOTE that capacity is currently an int in the implementation
2779 ret = env->GetIntField(buf, bufferCapacityField);
2780 return ret;
2781 }
2784 JNI_LEAF(jint, jni_GetVersion(JNIEnv *env))
2785 JNIWrapper("GetVersion");
2786 DTRACE_PROBE1(hotspot_jni, GetVersion__entry, env);
2787 DTRACE_PROBE1(hotspot_jni, GetVersion__return, CurrentVersion);
2788 return CurrentVersion;
2789 JNI_END
2791 extern struct JavaVM_ main_vm;
2793 JNI_LEAF(jint, jni_GetJavaVM(JNIEnv *env, JavaVM **vm))
2794 JNIWrapper("jni_GetJavaVM");
2795 DTRACE_PROBE2(hotspot_jni, GetJavaVM__entry, env, vm);
2796 *vm = (JavaVM *)(&main_vm);
2797 DTRACE_PROBE1(hotspot_jni, GetJavaVM__return, JNI_OK);
2798 return JNI_OK;
2799 JNI_END
2801 // Structure containing all jni functions
2802 struct JNINativeInterface_ jni_NativeInterface = {
2803 NULL,
2804 NULL,
2805 NULL,
2807 NULL,
2809 jni_GetVersion,
2811 jni_DefineClass,
2812 jni_FindClass,
2814 jni_FromReflectedMethod,
2815 jni_FromReflectedField,
2817 jni_ToReflectedMethod,
2819 jni_GetSuperclass,
2820 jni_IsAssignableFrom,
2822 jni_ToReflectedField,
2824 jni_Throw,
2825 jni_ThrowNew,
2826 jni_ExceptionOccurred,
2827 jni_ExceptionDescribe,
2828 jni_ExceptionClear,
2829 jni_FatalError,
2831 jni_PushLocalFrame,
2832 jni_PopLocalFrame,
2834 jni_NewGlobalRef,
2835 jni_DeleteGlobalRef,
2836 jni_DeleteLocalRef,
2837 jni_IsSameObject,
2839 jni_NewLocalRef,
2840 jni_EnsureLocalCapacity,
2842 jni_AllocObject,
2843 jni_NewObject,
2844 jni_NewObjectV,
2845 jni_NewObjectA,
2847 jni_GetObjectClass,
2848 jni_IsInstanceOf,
2850 jni_GetMethodID,
2852 jni_CallObjectMethod,
2853 jni_CallObjectMethodV,
2854 jni_CallObjectMethodA,
2855 jni_CallBooleanMethod,
2856 jni_CallBooleanMethodV,
2857 jni_CallBooleanMethodA,
2858 jni_CallByteMethod,
2859 jni_CallByteMethodV,
2860 jni_CallByteMethodA,
2861 jni_CallCharMethod,
2862 jni_CallCharMethodV,
2863 jni_CallCharMethodA,
2864 jni_CallShortMethod,
2865 jni_CallShortMethodV,
2866 jni_CallShortMethodA,
2867 jni_CallIntMethod,
2868 jni_CallIntMethodV,
2869 jni_CallIntMethodA,
2870 jni_CallLongMethod,
2871 jni_CallLongMethodV,
2872 jni_CallLongMethodA,
2873 jni_CallFloatMethod,
2874 jni_CallFloatMethodV,
2875 jni_CallFloatMethodA,
2876 jni_CallDoubleMethod,
2877 jni_CallDoubleMethodV,
2878 jni_CallDoubleMethodA,
2879 jni_CallVoidMethod,
2880 jni_CallVoidMethodV,
2881 jni_CallVoidMethodA,
2883 jni_CallNonvirtualObjectMethod,
2884 jni_CallNonvirtualObjectMethodV,
2885 jni_CallNonvirtualObjectMethodA,
2886 jni_CallNonvirtualBooleanMethod,
2887 jni_CallNonvirtualBooleanMethodV,
2888 jni_CallNonvirtualBooleanMethodA,
2889 jni_CallNonvirtualByteMethod,
2890 jni_CallNonvirtualByteMethodV,
2891 jni_CallNonvirtualByteMethodA,
2892 jni_CallNonvirtualCharMethod,
2893 jni_CallNonvirtualCharMethodV,
2894 jni_CallNonvirtualCharMethodA,
2895 jni_CallNonvirtualShortMethod,
2896 jni_CallNonvirtualShortMethodV,
2897 jni_CallNonvirtualShortMethodA,
2898 jni_CallNonvirtualIntMethod,
2899 jni_CallNonvirtualIntMethodV,
2900 jni_CallNonvirtualIntMethodA,
2901 jni_CallNonvirtualLongMethod,
2902 jni_CallNonvirtualLongMethodV,
2903 jni_CallNonvirtualLongMethodA,
2904 jni_CallNonvirtualFloatMethod,
2905 jni_CallNonvirtualFloatMethodV,
2906 jni_CallNonvirtualFloatMethodA,
2907 jni_CallNonvirtualDoubleMethod,
2908 jni_CallNonvirtualDoubleMethodV,
2909 jni_CallNonvirtualDoubleMethodA,
2910 jni_CallNonvirtualVoidMethod,
2911 jni_CallNonvirtualVoidMethodV,
2912 jni_CallNonvirtualVoidMethodA,
2914 jni_GetFieldID,
2916 jni_GetObjectField,
2917 jni_GetBooleanField,
2918 jni_GetByteField,
2919 jni_GetCharField,
2920 jni_GetShortField,
2921 jni_GetIntField,
2922 jni_GetLongField,
2923 jni_GetFloatField,
2924 jni_GetDoubleField,
2926 jni_SetObjectField,
2927 jni_SetBooleanField,
2928 jni_SetByteField,
2929 jni_SetCharField,
2930 jni_SetShortField,
2931 jni_SetIntField,
2932 jni_SetLongField,
2933 jni_SetFloatField,
2934 jni_SetDoubleField,
2936 jni_GetStaticMethodID,
2938 jni_CallStaticObjectMethod,
2939 jni_CallStaticObjectMethodV,
2940 jni_CallStaticObjectMethodA,
2941 jni_CallStaticBooleanMethod,
2942 jni_CallStaticBooleanMethodV,
2943 jni_CallStaticBooleanMethodA,
2944 jni_CallStaticByteMethod,
2945 jni_CallStaticByteMethodV,
2946 jni_CallStaticByteMethodA,
2947 jni_CallStaticCharMethod,
2948 jni_CallStaticCharMethodV,
2949 jni_CallStaticCharMethodA,
2950 jni_CallStaticShortMethod,
2951 jni_CallStaticShortMethodV,
2952 jni_CallStaticShortMethodA,
2953 jni_CallStaticIntMethod,
2954 jni_CallStaticIntMethodV,
2955 jni_CallStaticIntMethodA,
2956 jni_CallStaticLongMethod,
2957 jni_CallStaticLongMethodV,
2958 jni_CallStaticLongMethodA,
2959 jni_CallStaticFloatMethod,
2960 jni_CallStaticFloatMethodV,
2961 jni_CallStaticFloatMethodA,
2962 jni_CallStaticDoubleMethod,
2963 jni_CallStaticDoubleMethodV,
2964 jni_CallStaticDoubleMethodA,
2965 jni_CallStaticVoidMethod,
2966 jni_CallStaticVoidMethodV,
2967 jni_CallStaticVoidMethodA,
2969 jni_GetStaticFieldID,
2971 jni_GetStaticObjectField,
2972 jni_GetStaticBooleanField,
2973 jni_GetStaticByteField,
2974 jni_GetStaticCharField,
2975 jni_GetStaticShortField,
2976 jni_GetStaticIntField,
2977 jni_GetStaticLongField,
2978 jni_GetStaticFloatField,
2979 jni_GetStaticDoubleField,
2981 jni_SetStaticObjectField,
2982 jni_SetStaticBooleanField,
2983 jni_SetStaticByteField,
2984 jni_SetStaticCharField,
2985 jni_SetStaticShortField,
2986 jni_SetStaticIntField,
2987 jni_SetStaticLongField,
2988 jni_SetStaticFloatField,
2989 jni_SetStaticDoubleField,
2991 jni_NewString,
2992 jni_GetStringLength,
2993 jni_GetStringChars,
2994 jni_ReleaseStringChars,
2996 jni_NewStringUTF,
2997 jni_GetStringUTFLength,
2998 jni_GetStringUTFChars,
2999 jni_ReleaseStringUTFChars,
3001 jni_GetArrayLength,
3003 jni_NewObjectArray,
3004 jni_GetObjectArrayElement,
3005 jni_SetObjectArrayElement,
3007 jni_NewBooleanArray,
3008 jni_NewByteArray,
3009 jni_NewCharArray,
3010 jni_NewShortArray,
3011 jni_NewIntArray,
3012 jni_NewLongArray,
3013 jni_NewFloatArray,
3014 jni_NewDoubleArray,
3016 jni_GetBooleanArrayElements,
3017 jni_GetByteArrayElements,
3018 jni_GetCharArrayElements,
3019 jni_GetShortArrayElements,
3020 jni_GetIntArrayElements,
3021 jni_GetLongArrayElements,
3022 jni_GetFloatArrayElements,
3023 jni_GetDoubleArrayElements,
3025 jni_ReleaseBooleanArrayElements,
3026 jni_ReleaseByteArrayElements,
3027 jni_ReleaseCharArrayElements,
3028 jni_ReleaseShortArrayElements,
3029 jni_ReleaseIntArrayElements,
3030 jni_ReleaseLongArrayElements,
3031 jni_ReleaseFloatArrayElements,
3032 jni_ReleaseDoubleArrayElements,
3034 jni_GetBooleanArrayRegion,
3035 jni_GetByteArrayRegion,
3036 jni_GetCharArrayRegion,
3037 jni_GetShortArrayRegion,
3038 jni_GetIntArrayRegion,
3039 jni_GetLongArrayRegion,
3040 jni_GetFloatArrayRegion,
3041 jni_GetDoubleArrayRegion,
3043 jni_SetBooleanArrayRegion,
3044 jni_SetByteArrayRegion,
3045 jni_SetCharArrayRegion,
3046 jni_SetShortArrayRegion,
3047 jni_SetIntArrayRegion,
3048 jni_SetLongArrayRegion,
3049 jni_SetFloatArrayRegion,
3050 jni_SetDoubleArrayRegion,
3052 jni_RegisterNatives,
3053 jni_UnregisterNatives,
3055 jni_MonitorEnter,
3056 jni_MonitorExit,
3058 jni_GetJavaVM,
3060 jni_GetStringRegion,
3061 jni_GetStringUTFRegion,
3063 jni_GetPrimitiveArrayCritical,
3064 jni_ReleasePrimitiveArrayCritical,
3066 jni_GetStringCritical,
3067 jni_ReleaseStringCritical,
3069 jni_NewWeakGlobalRef,
3070 jni_DeleteWeakGlobalRef,
3072 jni_ExceptionCheck,
3074 jni_NewDirectByteBuffer,
3075 jni_GetDirectBufferAddress,
3076 jni_GetDirectBufferCapacity,
3078 // New 1_6 features
3080 jni_GetObjectRefType
3081 };
3084 // For jvmti use to modify jni function table.
3085 // Java threads in native contiues to run until it is transitioned
3086 // to VM at safepoint. Before the transition or before it is blocked
3087 // for safepoint it may access jni function table. VM could crash if
3088 // any java thread access the jni function table in the middle of memcpy.
3089 // To avoid this each function pointers are copied automically.
3090 void copy_jni_function_table(const struct JNINativeInterface_ *new_jni_NativeInterface) {
3091 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
3092 intptr_t *a = (intptr_t *) jni_functions();
3093 intptr_t *b = (intptr_t *) new_jni_NativeInterface;
3094 for (uint i=0; i < sizeof(struct JNINativeInterface_)/sizeof(void *); i++) {
3095 Atomic::store_ptr(*b++, a++);
3096 }
3097 }
3099 void quicken_jni_functions() {
3100 // Replace Get<Primitive>Field with fast versions
3101 if (UseFastJNIAccessors && !JvmtiExport::can_post_field_access()
3102 && !VerifyJNIFields && !TraceJNICalls && !CountJNICalls && !CheckJNICalls
3103 #if defined(_WINDOWS) && defined(IA32) && defined(COMPILER2)
3104 // windows x86 currently needs SEH wrapper and the gain of the fast
3105 // versions currently isn't certain for server vm on uniprocessor.
3106 && os::is_MP()
3107 #endif
3108 ) {
3109 address func;
3110 func = JNI_FastGetField::generate_fast_get_boolean_field();
3111 if (func != (address)-1) {
3112 jni_NativeInterface.GetBooleanField = (GetBooleanField_t)func;
3113 }
3114 func = JNI_FastGetField::generate_fast_get_byte_field();
3115 if (func != (address)-1) {
3116 jni_NativeInterface.GetByteField = (GetByteField_t)func;
3117 }
3118 func = JNI_FastGetField::generate_fast_get_char_field();
3119 if (func != (address)-1) {
3120 jni_NativeInterface.GetCharField = (GetCharField_t)func;
3121 }
3122 func = JNI_FastGetField::generate_fast_get_short_field();
3123 if (func != (address)-1) {
3124 jni_NativeInterface.GetShortField = (GetShortField_t)func;
3125 }
3126 func = JNI_FastGetField::generate_fast_get_int_field();
3127 if (func != (address)-1) {
3128 jni_NativeInterface.GetIntField = (GetIntField_t)func;
3129 }
3130 func = JNI_FastGetField::generate_fast_get_long_field();
3131 if (func != (address)-1) {
3132 jni_NativeInterface.GetLongField = (GetLongField_t)func;
3133 }
3134 func = JNI_FastGetField::generate_fast_get_float_field();
3135 if (func != (address)-1) {
3136 jni_NativeInterface.GetFloatField = (GetFloatField_t)func;
3137 }
3138 func = JNI_FastGetField::generate_fast_get_double_field();
3139 if (func != (address)-1) {
3140 jni_NativeInterface.GetDoubleField = (GetDoubleField_t)func;
3141 }
3142 }
3143 }
3145 // Returns the function structure
3146 struct JNINativeInterface_* jni_functions() {
3147 #ifndef JNICHECK_KERNEL
3148 if (CheckJNICalls) return jni_functions_check();
3149 #else // JNICHECK_KERNEL
3150 if (CheckJNICalls) warning("-Xcheck:jni is not supported in kernel vm.");
3151 #endif // JNICHECK_KERNEL
3152 return &jni_NativeInterface;
3153 }
3155 // Returns the function structure
3156 struct JNINativeInterface_* jni_functions_nocheck() {
3157 return &jni_NativeInterface;
3158 }
3161 // Invocation API
3164 // Forward declaration
3165 extern const struct JNIInvokeInterface_ jni_InvokeInterface;
3167 // Global invocation API vars
3168 volatile jint vm_created = 0;
3169 // Indicate whether it is safe to recreate VM
3170 volatile jint safe_to_recreate_vm = 1;
3171 struct JavaVM_ main_vm = {&jni_InvokeInterface};
3174 #define JAVASTACKSIZE (400 * 1024) /* Default size of a thread java stack */
3175 #define PROCSTACKSIZE 0 /* 0 means default size in HPI */
3176 enum { VERIFY_NONE, VERIFY_REMOTE, VERIFY_ALL };
3178 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, void*);
3179 DT_RETURN_MARK_DECL(GetDefaultJavaVMInitArgs, jint);
3181 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args_) {
3182 HS_DTRACE_PROBE1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, args_);
3183 JDK1_1InitArgs *args = (JDK1_1InitArgs *)args_;
3184 jint ret = JNI_ERR;
3185 DT_RETURN_MARK(GetDefaultJavaVMInitArgs, jint, (const jint&)ret);
3187 if (Threads::is_supported_jni_version(args->version)) {
3188 ret = JNI_OK;
3189 }
3190 // 1.1 style no longer supported in hotspot.
3191 // According the JNI spec, we should update args->version on return.
3192 // We also use the structure to communicate with launcher about default
3193 // stack size.
3194 if (args->version == JNI_VERSION_1_1) {
3195 args->version = JNI_VERSION_1_2;
3196 // javaStackSize is int in arguments structure
3197 assert(jlong(ThreadStackSize) * K < INT_MAX, "integer overflow");
3198 args->javaStackSize = (jint)(ThreadStackSize * K);
3199 }
3200 return ret;
3201 }
3203 HS_DTRACE_PROBE_DECL3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3204 DT_RETURN_MARK_DECL(CreateJavaVM, jint);
3206 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) {
3207 HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3209 jint result = JNI_ERR;
3210 DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result);
3212 // At the moment it's only possible to have one Java VM,
3213 // since some of the runtime state is in global variables.
3215 // We cannot use our mutex locks here, since they only work on
3216 // Threads. We do an atomic compare and exchange to ensure only
3217 // one thread can call this method at a time
3219 // We use Atomic::xchg rather than Atomic::add/dec since on some platforms
3220 // the add/dec implementations are dependent on whether we are running
3221 // on a multiprocessor, and at this stage of initialization the os::is_MP
3222 // function used to determine this will always return false. Atomic::xchg
3223 // does not have this problem.
3224 if (Atomic::xchg(1, &vm_created) == 1) {
3225 return JNI_ERR; // already created, or create attempt in progress
3226 }
3227 if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) {
3228 return JNI_ERR; // someone tried and failed and retry not allowed.
3229 }
3231 assert(vm_created == 1, "vm_created is true during the creation");
3233 /**
3234 * Certain errors during initialization are recoverable and do not
3235 * prevent this method from being called again at a later time
3236 * (perhaps with different arguments). However, at a certain
3237 * point during initialization if an error occurs we cannot allow
3238 * this function to be called again (or it will crash). In those
3239 * situations, the 'canTryAgain' flag is set to false, which atomically
3240 * sets safe_to_recreate_vm to 1, such that any new call to
3241 * JNI_CreateJavaVM will immediately fail using the above logic.
3242 */
3243 bool can_try_again = true;
3245 result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again);
3246 if (result == JNI_OK) {
3247 JavaThread *thread = JavaThread::current();
3248 /* thread is thread_in_vm here */
3249 *vm = (JavaVM *)(&main_vm);
3250 *(JNIEnv**)penv = thread->jni_environment();
3252 // Tracks the time application was running before GC
3253 RuntimeService::record_application_start();
3255 // Notify JVMTI
3256 if (JvmtiExport::should_post_thread_life()) {
3257 JvmtiExport::post_thread_start(thread);
3258 }
3259 // Check if we should compile all classes on bootclasspath
3260 NOT_PRODUCT(if (CompileTheWorld) ClassLoader::compile_the_world();)
3261 // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving.
3262 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3263 } else {
3264 if (can_try_again) {
3265 // reset safe_to_recreate_vm to 1 so that retrial would be possible
3266 safe_to_recreate_vm = 1;
3267 }
3269 // Creation failed. We must reset vm_created
3270 *vm = 0;
3271 *(JNIEnv**)penv = 0;
3272 // reset vm_created last to avoid race condition. Use OrderAccess to
3273 // control both compiler and architectural-based reordering.
3274 OrderAccess::release_store(&vm_created, 0);
3275 }
3277 return result;
3278 }
3280 HS_DTRACE_PROBE_DECL3(hotspot_jni, GetCreatedJavaVMs__entry, \
3281 JavaVM**, jsize, jsize*);
3282 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetCreatedJavaVMs__return, jint);
3284 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vm_buf, jsize bufLen, jsize *numVMs) {
3285 // See bug 4367188, the wrapper can sometimes cause VM crashes
3286 // JNIWrapper("GetCreatedJavaVMs");
3287 HS_DTRACE_PROBE3(hotspot_jni, GetCreatedJavaVMs__entry, \
3288 vm_buf, bufLen, numVMs);
3289 if (vm_created) {
3290 if (numVMs != NULL) *numVMs = 1;
3291 if (bufLen > 0) *vm_buf = (JavaVM *)(&main_vm);
3292 } else {
3293 if (numVMs != NULL) *numVMs = 0;
3294 }
3295 HS_DTRACE_PROBE1(hotspot_jni, GetCreatedJavaVMs__return, JNI_OK);
3296 return JNI_OK;
3297 }
3299 extern "C" {
3301 DT_RETURN_MARK_DECL(DestroyJavaVM, jint);
3303 jint JNICALL jni_DestroyJavaVM(JavaVM *vm) {
3304 DTRACE_PROBE1(hotspot_jni, DestroyJavaVM__entry, vm);
3305 jint res = JNI_ERR;
3306 DT_RETURN_MARK(DestroyJavaVM, jint, (const jint&)res);
3308 if (!vm_created) {
3309 res = JNI_ERR;
3310 return res;
3311 }
3313 JNIWrapper("DestroyJavaVM");
3314 JNIEnv *env;
3315 JavaVMAttachArgs destroyargs;
3316 destroyargs.version = CurrentVersion;
3317 destroyargs.name = (char *)"DestroyJavaVM";
3318 destroyargs.group = NULL;
3319 res = vm->AttachCurrentThread((void **)&env, (void *)&destroyargs);
3320 if (res != JNI_OK) {
3321 return res;
3322 }
3324 // Since this is not a JVM_ENTRY we have to set the thread state manually before entering.
3325 JavaThread* thread = JavaThread::current();
3326 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3327 if (Threads::destroy_vm()) {
3328 // Should not change thread state, VM is gone
3329 vm_created = false;
3330 res = JNI_OK;
3331 return res;
3332 } else {
3333 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3334 res = JNI_ERR;
3335 return res;
3336 }
3337 }
3340 static jint attach_current_thread(JavaVM *vm, void **penv, void *_args, bool daemon) {
3341 JavaVMAttachArgs *args = (JavaVMAttachArgs *) _args;
3343 // Check below commented out from JDK1.2fcs as well
3344 /*
3345 if (args && (args->version != JNI_VERSION_1_1 || args->version != JNI_VERSION_1_2)) {
3346 return JNI_EVERSION;
3347 }
3348 */
3350 Thread* t = ThreadLocalStorage::get_thread_slow();
3351 if (t != NULL) {
3352 // If the thread has been attached this operation is a no-op
3353 *(JNIEnv**)penv = ((JavaThread*) t)->jni_environment();
3354 return JNI_OK;
3355 }
3357 // Create a thread and mark it as attaching so it will be skipped by the
3358 // ThreadsListEnumerator - see CR 6404306
3359 JavaThread* thread = new JavaThread(true);
3361 // Set correct safepoint info. The thread is going to call into Java when
3362 // initializing the Java level thread object. Hence, the correct state must
3363 // be set in order for the Safepoint code to deal with it correctly.
3364 thread->set_thread_state(_thread_in_vm);
3365 // Must do this before initialize_thread_local_storage
3366 thread->record_stack_base_and_size();
3367 thread->initialize_thread_local_storage();
3369 if (!os::create_attached_thread(thread)) {
3370 delete thread;
3371 return JNI_ERR;
3372 }
3373 thread->initialize_tlab();
3375 // Crucial that we do not have a safepoint check for this thread, since it has
3376 // not been added to the Thread list yet.
3377 { Threads_lock->lock_without_safepoint_check();
3378 // This must be inside this lock in order to get FullGCALot to work properly, i.e., to
3379 // avoid this thread trying to do a GC before it is added to the thread-list
3380 thread->set_active_handles(JNIHandleBlock::allocate_block());
3381 Threads::add(thread, daemon);
3382 Threads_lock->unlock();
3383 }
3384 // Create thread group and name info from attach arguments
3385 oop group = NULL;
3386 char* thread_name = NULL;
3387 if (args != NULL && Threads::is_supported_jni_version(args->version)) {
3388 group = JNIHandles::resolve(args->group);
3389 thread_name = args->name; // may be NULL
3390 }
3391 if (group == NULL) group = Universe::main_thread_group();
3393 // Create Java level thread object and attach it to this thread
3394 bool attach_failed = false;
3395 {
3396 EXCEPTION_MARK;
3397 HandleMark hm(THREAD);
3398 Handle thread_group(THREAD, group);
3399 thread->allocate_threadObj(thread_group, thread_name, daemon, THREAD);
3400 if (HAS_PENDING_EXCEPTION) {
3401 CLEAR_PENDING_EXCEPTION;
3402 // cleanup outside the handle mark.
3403 attach_failed = true;
3404 }
3405 }
3407 if (attach_failed) {
3408 // Added missing cleanup
3409 thread->cleanup_failed_attach_current_thread();
3410 return JNI_ERR;
3411 }
3413 // mark the thread as no longer attaching
3414 // this uses a fence to push the change through so we don't have
3415 // to regrab the threads_lock
3416 thread->set_attached();
3418 // Enable stack overflow checks
3419 thread->create_stack_guard_pages();
3421 // Set java thread status.
3422 java_lang_Thread::set_thread_status(thread->threadObj(),
3423 java_lang_Thread::RUNNABLE);
3425 // Notify the debugger
3426 if (JvmtiExport::should_post_thread_life()) {
3427 JvmtiExport::post_thread_start(thread);
3428 }
3430 *(JNIEnv**)penv = thread->jni_environment();
3432 // Now leaving the VM, so change thread_state. This is normally automatically taken care
3433 // of in the JVM_ENTRY. But in this situation we have to do it manually. Notice, that by
3434 // using ThreadStateTransition::transition, we do a callback to the safepoint code if
3435 // needed.
3437 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3439 // Perform any platform dependent FPU setup
3440 os::setup_fpu();
3442 return JNI_OK;
3443 }
3446 jint JNICALL jni_AttachCurrentThread(JavaVM *vm, void **penv, void *_args) {
3447 DTRACE_PROBE3(hotspot_jni, AttachCurrentThread__entry, vm, penv, _args);
3448 if (!vm_created) {
3449 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, JNI_ERR);
3450 return JNI_ERR;
3451 }
3453 JNIWrapper("AttachCurrentThread");
3454 jint ret = attach_current_thread(vm, penv, _args, false);
3455 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, ret);
3456 return ret;
3457 }
3460 jint JNICALL jni_DetachCurrentThread(JavaVM *vm) {
3461 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__entry, vm);
3462 VM_Exit::block_if_vm_exited();
3464 JNIWrapper("DetachCurrentThread");
3466 // If the thread has been deattacted the operations is a no-op
3467 if (ThreadLocalStorage::thread() == NULL) {
3468 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3469 return JNI_OK;
3470 }
3472 JavaThread* thread = JavaThread::current();
3473 if (thread->has_last_Java_frame()) {
3474 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_ERR);
3475 // Can't detach a thread that's running java, that can't work.
3476 return JNI_ERR;
3477 }
3479 // Safepoint support. Have to do call-back to safepoint code, if in the
3480 // middel of a safepoint operation
3481 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3483 // XXX: Note that JavaThread::exit() call below removes the guards on the
3484 // stack pages set up via enable_stack_{red,yellow}_zone() calls
3485 // above in jni_AttachCurrentThread. Unfortunately, while the setting
3486 // of the guards is visible in jni_AttachCurrentThread above,
3487 // the removal of the guards is buried below in JavaThread::exit()
3488 // here. The abstraction should be more symmetrically either exposed
3489 // or hidden (e.g. it could probably be hidden in the same
3490 // (platform-dependent) methods where we do alternate stack
3491 // maintenance work?)
3492 thread->exit(false, JavaThread::jni_detach);
3493 delete thread;
3495 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3496 return JNI_OK;
3497 }
3499 DT_RETURN_MARK_DECL(GetEnv, jint);
3501 jint JNICALL jni_GetEnv(JavaVM *vm, void **penv, jint version) {
3502 DTRACE_PROBE3(hotspot_jni, GetEnv__entry, vm, penv, version);
3503 jint ret = JNI_ERR;
3504 DT_RETURN_MARK(GetEnv, jint, (const jint&)ret);
3506 if (!vm_created) {
3507 *penv = NULL;
3508 ret = JNI_EDETACHED;
3509 return ret;
3510 }
3512 if (JvmtiExport::is_jvmti_version(version)) {
3513 ret = JvmtiExport::get_jvmti_interface(vm, penv, version);
3514 return ret;
3515 }
3517 #ifndef JVMPI_VERSION_1
3518 // need these in order to be polite about older agents
3519 #define JVMPI_VERSION_1 ((jint)0x10000001)
3520 #define JVMPI_VERSION_1_1 ((jint)0x10000002)
3521 #define JVMPI_VERSION_1_2 ((jint)0x10000003)
3522 #endif // !JVMPI_VERSION_1
3524 Thread* thread = ThreadLocalStorage::thread();
3525 if (thread != NULL && thread->is_Java_thread()) {
3526 if (Threads::is_supported_jni_version_including_1_1(version)) {
3527 *(JNIEnv**)penv = ((JavaThread*) thread)->jni_environment();
3528 ret = JNI_OK;
3529 return ret;
3531 } else if (version == JVMPI_VERSION_1 ||
3532 version == JVMPI_VERSION_1_1 ||
3533 version == JVMPI_VERSION_1_2) {
3534 tty->print_cr("ERROR: JVMPI, an experimental interface, is no longer supported.");
3535 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3536 ret = JNI_EVERSION;
3537 return ret;
3538 } else if (JvmtiExport::is_jvmdi_version(version)) {
3539 tty->print_cr("FATAL ERROR: JVMDI is no longer supported.");
3540 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3541 ret = JNI_EVERSION;
3542 return ret;
3543 } else {
3544 *penv = NULL;
3545 ret = JNI_EVERSION;
3546 return ret;
3547 }
3548 } else {
3549 *penv = NULL;
3550 ret = JNI_EDETACHED;
3551 return ret;
3552 }
3553 }
3556 jint JNICALL jni_AttachCurrentThreadAsDaemon(JavaVM *vm, void **penv, void *_args) {
3557 DTRACE_PROBE3(hotspot_jni, AttachCurrentThreadAsDaemon__entry, vm, penv, _args);
3558 if (!vm_created) {
3559 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, JNI_ERR);
3560 return JNI_ERR;
3561 }
3563 JNIWrapper("AttachCurrentThreadAsDaemon");
3564 jint ret = attach_current_thread(vm, penv, _args, true);
3565 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, ret);
3566 return ret;
3567 }
3570 } // End extern "C"
3572 const struct JNIInvokeInterface_ jni_InvokeInterface = {
3573 NULL,
3574 NULL,
3575 NULL,
3577 jni_DestroyJavaVM,
3578 jni_AttachCurrentThread,
3579 jni_DetachCurrentThread,
3580 jni_GetEnv,
3581 jni_AttachCurrentThreadAsDaemon
3582 };
