Tue, 13 Jan 2009 12:08:43 -0800
6791815: Fix for 6471657 can cause deadlock on non-Solaris platforms when initializing direct buffer support
Summary: Place the state transition inside the loop so that the VMThread could proceed for safepoint
Reviewed-by: dholmes, never, acorn
1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_jni.cpp.incl"
28 static jint CurrentVersion = JNI_VERSION_1_6;
31 // The DT_RETURN_MARK macros create a scoped object to fire the dtrace
32 // '-return' probe regardless of the return path is taken out of the function.
33 // Methods that have multiple return paths use this to avoid having to
34 // instrument each return path. Methods that use CHECK or THROW must use this
35 // since those macros can cause an immedate uninstrumented return.
36 //
37 // In order to get the return value, a reference to the variable containing
38 // the return value must be passed to the contructor of the object, and
39 // the return value must be set before return (since the mark object has
40 // a reference to it).
41 //
42 // Example:
43 // DT_RETURN_MARK_DECL(SomeFunc, int);
44 // JNI_ENTRY(int, SomeFunc, ...)
45 // int return_value = 0;
46 // DT_RETURN_MARK(SomeFunc, int, (const int&)return_value);
47 // foo(CHECK_0)
48 // return_value = 5;
49 // return return_value;
50 // JNI_END
51 #define DT_RETURN_MARK_DECL(name, type) \
52 HS_DTRACE_PROBE_DECL1(hotspot_jni, name##__return, type); \
53 DTRACE_ONLY( \
54 class DTraceReturnProbeMark_##name { \
55 public: \
56 const type& _ret_ref; \
57 DTraceReturnProbeMark_##name(const type& v) : _ret_ref(v) {} \
58 ~DTraceReturnProbeMark_##name() { \
59 HS_DTRACE_PROBE1(hotspot_jni, name##__return, _ret_ref); \
60 } \
61 } \
62 )
63 // Void functions are simpler since there's no return value
64 #define DT_VOID_RETURN_MARK_DECL(name) \
65 HS_DTRACE_PROBE_DECL0(hotspot_jni, name##__return); \
66 DTRACE_ONLY( \
67 class DTraceReturnProbeMark_##name { \
68 public: \
69 ~DTraceReturnProbeMark_##name() { \
70 HS_DTRACE_PROBE0(hotspot_jni, name##__return); \
71 } \
72 } \
73 )
76 // Place these macros in the function to mark the return. Non-void
77 // functions need the type and address of the return value.
78 #define DT_RETURN_MARK(name, type, ref) \
79 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark(ref) )
80 #define DT_VOID_RETURN_MARK(name) \
81 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark )
84 // Use these to select distinct code for floating-point vs. non-floating point
85 // situations. Used from within common macros where we need slightly
86 // different behavior for Float/Double
87 #define FP_SELECT_Boolean(intcode, fpcode) intcode
88 #define FP_SELECT_Byte(intcode, fpcode) intcode
89 #define FP_SELECT_Char(intcode, fpcode) intcode
90 #define FP_SELECT_Short(intcode, fpcode) intcode
91 #define FP_SELECT_Object(intcode, fpcode) intcode
92 #define FP_SELECT_Int(intcode, fpcode) intcode
93 #define FP_SELECT_Long(intcode, fpcode) intcode
94 #define FP_SELECT_Float(intcode, fpcode) fpcode
95 #define FP_SELECT_Double(intcode, fpcode) fpcode
96 #define FP_SELECT(TypeName, intcode, fpcode) \
97 FP_SELECT_##TypeName(intcode, fpcode)
99 #define COMMA ,
101 // Choose DT_RETURN_MARK macros based on the type: float/double -> void
102 // (dtrace doesn't do FP yet)
103 #define DT_RETURN_MARK_DECL_FOR(TypeName, name, type) \
104 FP_SELECT(TypeName, \
105 DT_RETURN_MARK_DECL(name, type), DT_VOID_RETURN_MARK_DECL(name) )
106 #define DT_RETURN_MARK_FOR(TypeName, name, type, ref) \
107 FP_SELECT(TypeName, \
108 DT_RETURN_MARK(name, type, ref), DT_VOID_RETURN_MARK(name) )
111 // out-of-line helpers for class jfieldIDWorkaround:
113 bool jfieldIDWorkaround::is_valid_jfieldID(klassOop k, jfieldID id) {
114 if (jfieldIDWorkaround::is_instance_jfieldID(k, id)) {
115 uintptr_t as_uint = (uintptr_t) id;
116 intptr_t offset = raw_instance_offset(id);
117 if (is_checked_jfieldID(id)) {
118 if (!klass_hash_ok(k, id)) {
119 return false;
120 }
121 }
122 return instanceKlass::cast(k)->contains_field_offset(offset);
123 } else {
124 JNIid* result = (JNIid*) id;
125 #ifdef ASSERT
126 return result != NULL && result->is_static_field_id();
127 #else
128 return result != NULL;
129 #endif
130 }
131 }
134 intptr_t jfieldIDWorkaround::encode_klass_hash(klassOop k, intptr_t offset) {
135 if (offset <= small_offset_mask) {
136 klassOop field_klass = k;
137 klassOop super_klass = Klass::cast(field_klass)->super();
138 // With compressed oops the most super class with nonstatic fields would
139 // be the owner of fields embedded in the header.
140 while (instanceKlass::cast(super_klass)->has_nonstatic_fields() &&
141 instanceKlass::cast(super_klass)->contains_field_offset(offset)) {
142 field_klass = super_klass; // super contains the field also
143 super_klass = Klass::cast(field_klass)->super();
144 }
145 debug_only(No_Safepoint_Verifier nosafepoint;)
146 uintptr_t klass_hash = field_klass->identity_hash();
147 return ((klass_hash & klass_mask) << klass_shift) | checked_mask_in_place;
148 } else {
149 #if 0
150 #ifndef PRODUCT
151 {
152 ResourceMark rm;
153 warning("VerifyJNIFields: long offset %d in %s", offset, Klass::cast(k)->external_name());
154 }
155 #endif
156 #endif
157 return 0;
158 }
159 }
161 bool jfieldIDWorkaround::klass_hash_ok(klassOop k, jfieldID id) {
162 uintptr_t as_uint = (uintptr_t) id;
163 intptr_t klass_hash = (as_uint >> klass_shift) & klass_mask;
164 do {
165 debug_only(No_Safepoint_Verifier nosafepoint;)
166 // Could use a non-blocking query for identity_hash here...
167 if ((k->identity_hash() & klass_mask) == klass_hash)
168 return true;
169 k = Klass::cast(k)->super();
170 } while (k != NULL);
171 return false;
172 }
174 void jfieldIDWorkaround::verify_instance_jfieldID(klassOop k, jfieldID id) {
175 guarantee(jfieldIDWorkaround::is_instance_jfieldID(k, id), "must be an instance field" );
176 uintptr_t as_uint = (uintptr_t) id;
177 intptr_t offset = raw_instance_offset(id);
178 if (VerifyJNIFields) {
179 if (is_checked_jfieldID(id)) {
180 guarantee(klass_hash_ok(k, id),
181 "Bug in native code: jfieldID class must match object");
182 } else {
183 #if 0
184 #ifndef PRODUCT
185 if (Verbose) {
186 ResourceMark rm;
187 warning("VerifyJNIFields: unverified offset %d for %s", offset, Klass::cast(k)->external_name());
188 }
189 #endif
190 #endif
191 }
192 }
193 guarantee(instanceKlass::cast(k)->contains_field_offset(offset),
194 "Bug in native code: jfieldID offset must address interior of object");
195 }
197 // Pick a reasonable higher bound for local capacity requested
198 // for EnsureLocalCapacity and PushLocalFrame. We don't want it too
199 // high because a test (or very unusual application) may try to allocate
200 // that many handles and run out of swap space. An implementation is
201 // permitted to allocate more handles than the ensured capacity, so this
202 // value is set high enough to prevent compatibility problems.
203 const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K;
206 // Wrapper to trace JNI functions
208 #ifdef ASSERT
209 Histogram* JNIHistogram;
210 static volatile jint JNIHistogram_lock = 0;
212 class JNITraceWrapper : public StackObj {
213 public:
214 JNITraceWrapper(const char* format, ...) {
215 if (TraceJNICalls) {
216 va_list ap;
217 va_start(ap, format);
218 tty->print("JNI ");
219 tty->vprint_cr(format, ap);
220 va_end(ap);
221 }
222 }
223 };
225 class JNIHistogramElement : public HistogramElement {
226 public:
227 JNIHistogramElement(const char* name);
228 };
230 JNIHistogramElement::JNIHistogramElement(const char* elementName) {
231 _name = elementName;
232 uintx count = 0;
234 while (Atomic::cmpxchg(1, &JNIHistogram_lock, 0) != 0) {
235 while (OrderAccess::load_acquire(&JNIHistogram_lock) != 0) {
236 count +=1;
237 if ( (WarnOnStalledSpinLock > 0)
238 && (count % WarnOnStalledSpinLock == 0)) {
239 warning("JNIHistogram_lock seems to be stalled");
240 }
241 }
242 }
245 if(JNIHistogram == NULL)
246 JNIHistogram = new Histogram("JNI Call Counts",100);
248 JNIHistogram->add_element(this);
249 Atomic::dec(&JNIHistogram_lock);
250 }
252 #define JNICountWrapper(arg) \
253 static JNIHistogramElement* e = new JNIHistogramElement(arg); \
254 /* There is a MT-race condition in VC++. So we need to make sure that that e has been initialized */ \
255 if (e != NULL) e->increment_count()
256 #define JNIWrapper(arg) JNICountWrapper(arg); JNITraceWrapper(arg)
257 #else
258 #define JNIWrapper(arg)
259 #endif
262 // Implementation of JNI entries
264 DT_RETURN_MARK_DECL(DefineClass, jclass);
266 JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef,
267 const jbyte *buf, jsize bufLen))
268 JNIWrapper("DefineClass");
270 DTRACE_PROBE5(hotspot_jni, DefineClass__entry,
271 env, name, loaderRef, buf, bufLen);
272 jclass cls = NULL;
273 DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls);
275 // Since exceptions can be thrown, class initialization can take place
276 // if name is NULL no check for class name in .class stream has to be made.
277 symbolHandle class_name;
278 if (name != NULL) {
279 const int str_len = (int)strlen(name);
280 if (str_len > symbolOopDesc::max_length()) {
281 // It's impossible to create this class; the name cannot fit
282 // into the constant pool.
283 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
284 }
285 class_name = oopFactory::new_symbol_handle(name, str_len, CHECK_NULL);
286 }
288 ResourceMark rm(THREAD);
289 ClassFileStream st((u1*) buf, bufLen, NULL);
290 Handle class_loader (THREAD, JNIHandles::resolve(loaderRef));
292 if (UsePerfData && !class_loader.is_null()) {
293 // check whether the current caller thread holds the lock or not.
294 // If not, increment the corresponding counter
295 if (ObjectSynchronizer::
296 query_lock_ownership((JavaThread*)THREAD, class_loader) !=
297 ObjectSynchronizer::owner_self) {
298 ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc();
299 }
300 }
301 klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
302 Handle(), &st, CHECK_NULL);
304 cls = (jclass)JNIHandles::make_local(
305 env, Klass::cast(k)->java_mirror());
306 return cls;
307 JNI_END
311 static bool first_time_FindClass = true;
313 DT_RETURN_MARK_DECL(FindClass, jclass);
315 JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name))
316 JNIWrapper("FindClass");
317 DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name);
319 jclass result = NULL;
320 DT_RETURN_MARK(FindClass, jclass, (const jclass&)result);
322 // Remember if we are the first invocation of jni_FindClass
323 bool first_time = first_time_FindClass;
324 first_time_FindClass = false;
326 // Sanity check the name: it cannot be null or larger than the maximum size
327 // name we can fit in the constant pool.
328 if (name == NULL || (int)strlen(name) > symbolOopDesc::max_length()) {
329 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
330 }
332 //%note jni_3
333 Handle loader;
334 Handle protection_domain;
335 // Find calling class
336 instanceKlassHandle k (THREAD, thread->security_get_caller_class(0));
337 if (k.not_null()) {
338 loader = Handle(THREAD, k->class_loader());
339 // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed
340 // in the correct class context.
341 if (loader.is_null() &&
342 k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
343 JavaValue result(T_OBJECT);
344 JavaCalls::call_static(&result, k,
345 vmSymbolHandles::getFromClass_name(),
346 vmSymbolHandles::void_class_signature(),
347 thread);
348 if (HAS_PENDING_EXCEPTION) {
349 Handle ex(thread, thread->pending_exception());
350 CLEAR_PENDING_EXCEPTION;
351 THROW_HANDLE_0(ex);
352 }
353 oop mirror = (oop) result.get_jobject();
354 loader = Handle(THREAD,
355 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader());
356 protection_domain = Handle(THREAD,
357 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain());
358 }
359 } else {
360 // We call ClassLoader.getSystemClassLoader to obtain the system class loader.
361 loader = Handle(THREAD, SystemDictionary::java_system_loader());
362 }
364 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
365 result = find_class_from_class_loader(env, sym, true, loader,
366 protection_domain, true, thread);
368 // If we were the first invocation of jni_FindClass, we enable compilation again
369 // rather than just allowing invocation counter to overflow and decay.
370 // Controlled by flag DelayCompilationDuringStartup.
371 if (first_time && !CompileTheWorld)
372 CompilationPolicy::completed_vm_startup();
374 return result;
375 JNI_END
377 DT_RETURN_MARK_DECL(FromReflectedMethod, jmethodID);
379 JNI_ENTRY(jmethodID, jni_FromReflectedMethod(JNIEnv *env, jobject method))
380 JNIWrapper("FromReflectedMethod");
381 DTRACE_PROBE2(hotspot_jni, FromReflectedMethod__entry, env, method);
382 jmethodID ret = NULL;
383 DT_RETURN_MARK(FromReflectedMethod, jmethodID, (const jmethodID&)ret);
385 // method is a handle to a java.lang.reflect.Method object
386 oop reflected = JNIHandles::resolve_non_null(method);
387 oop mirror = NULL;
388 int slot = 0;
390 if (reflected->klass() == SystemDictionary::reflect_constructor_klass()) {
391 mirror = java_lang_reflect_Constructor::clazz(reflected);
392 slot = java_lang_reflect_Constructor::slot(reflected);
393 } else {
394 assert(reflected->klass() == SystemDictionary::reflect_method_klass(), "wrong type");
395 mirror = java_lang_reflect_Method::clazz(reflected);
396 slot = java_lang_reflect_Method::slot(reflected);
397 }
398 klassOop k = java_lang_Class::as_klassOop(mirror);
400 KlassHandle k1(THREAD, k);
401 // Make sure class is initialized before handing id's out to methods
402 Klass::cast(k1())->initialize(CHECK_NULL);
403 methodOop m = instanceKlass::cast(k1())->method_with_idnum(slot);
404 ret = m==NULL? NULL : m->jmethod_id(); // return NULL if reflected method deleted
405 return ret;
406 JNI_END
408 DT_RETURN_MARK_DECL(FromReflectedField, jfieldID);
410 JNI_ENTRY(jfieldID, jni_FromReflectedField(JNIEnv *env, jobject field))
411 JNIWrapper("FromReflectedField");
412 DTRACE_PROBE2(hotspot_jni, FromReflectedField__entry, env, field);
413 jfieldID ret = NULL;
414 DT_RETURN_MARK(FromReflectedField, jfieldID, (const jfieldID&)ret);
416 // field is a handle to a java.lang.reflect.Field object
417 oop reflected = JNIHandles::resolve_non_null(field);
418 oop mirror = java_lang_reflect_Field::clazz(reflected);
419 klassOop k = java_lang_Class::as_klassOop(mirror);
420 int slot = java_lang_reflect_Field::slot(reflected);
421 int modifiers = java_lang_reflect_Field::modifiers(reflected);
423 KlassHandle k1(THREAD, k);
424 // Make sure class is initialized before handing id's out to fields
425 Klass::cast(k1())->initialize(CHECK_NULL);
427 // First check if this is a static field
428 if (modifiers & JVM_ACC_STATIC) {
429 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
430 JNIid* id = instanceKlass::cast(k1())->jni_id_for(offset);
431 assert(id != NULL, "corrupt Field object");
432 debug_only(id->set_is_static_field_id();)
433 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
434 ret = jfieldIDWorkaround::to_static_jfieldID(id);
435 return ret;
436 }
438 // The slot is the index of the field description in the field-array
439 // The jfieldID is the offset of the field within the object
440 // It may also have hash bits for k, if VerifyJNIFields is turned on.
441 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
442 assert(instanceKlass::cast(k1())->contains_field_offset(offset), "stay within object");
443 ret = jfieldIDWorkaround::to_instance_jfieldID(k1(), offset);
444 return ret;
445 JNI_END
447 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject);
449 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
450 JNIWrapper("ToReflectedMethod");
451 DTRACE_PROBE4(hotspot_jni, ToReflectedMethod__entry, env, cls, method_id, isStatic);
452 jobject ret = NULL;
453 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
455 methodHandle m (THREAD, JNIHandles::resolve_jmethod_id(method_id));
456 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
457 oop reflection_method;
458 if (m->is_initializer()) {
459 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
460 } else {
461 reflection_method = Reflection::new_method(m, UseNewReflection, false, CHECK_NULL);
462 }
463 ret = JNIHandles::make_local(env, reflection_method);
464 return ret;
465 JNI_END
467 DT_RETURN_MARK_DECL(GetSuperclass, jclass);
469 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
470 JNIWrapper("GetSuperclass");
471 DTRACE_PROBE2(hotspot_jni, GetSuperclass__entry, env, sub);
472 jclass obj = NULL;
473 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
475 oop mirror = JNIHandles::resolve_non_null(sub);
476 // primitive classes return NULL
477 if (java_lang_Class::is_primitive(mirror)) return NULL;
479 // Rules of Class.getSuperClass as implemented by KLass::java_super:
480 // arrays return Object
481 // interfaces return NULL
482 // proper classes return Klass::super()
483 klassOop k = java_lang_Class::as_klassOop(mirror);
484 if (Klass::cast(k)->is_interface()) return NULL;
486 // return mirror for superclass
487 klassOop super = Klass::cast(k)->java_super();
488 // super2 is the value computed by the compiler's getSuperClass intrinsic:
489 debug_only(klassOop super2 = ( Klass::cast(k)->oop_is_javaArray()
490 ? SystemDictionary::object_klass()
491 : Klass::cast(k)->super() ) );
492 assert(super == super2,
493 "java_super computation depends on interface, array, other super");
494 obj = (super == NULL) ? NULL : (jclass) JNIHandles::make_local(Klass::cast(super)->java_mirror());
495 return obj;
496 JNI_END
498 JNI_QUICK_ENTRY(jboolean, jni_IsAssignableFrom(JNIEnv *env, jclass sub, jclass super))
499 JNIWrapper("IsSubclassOf");
500 DTRACE_PROBE3(hotspot_jni, IsAssignableFrom__entry, env, sub, super);
501 oop sub_mirror = JNIHandles::resolve_non_null(sub);
502 oop super_mirror = JNIHandles::resolve_non_null(super);
503 if (java_lang_Class::is_primitive(sub_mirror) ||
504 java_lang_Class::is_primitive(super_mirror)) {
505 jboolean ret = (sub_mirror == super_mirror);
506 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
507 return ret;
508 }
509 klassOop sub_klass = java_lang_Class::as_klassOop(sub_mirror);
510 klassOop super_klass = java_lang_Class::as_klassOop(super_mirror);
511 assert(sub_klass != NULL && super_klass != NULL, "invalid arguments to jni_IsAssignableFrom");
512 jboolean ret = Klass::cast(sub_klass)->is_subtype_of(super_klass) ?
513 JNI_TRUE : JNI_FALSE;
514 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
515 return ret;
516 JNI_END
518 DT_RETURN_MARK_DECL(Throw, jint);
520 JNI_ENTRY(jint, jni_Throw(JNIEnv *env, jthrowable obj))
521 JNIWrapper("Throw");
522 DTRACE_PROBE2(hotspot_jni, Throw__entry, env, obj);
523 jint ret = JNI_OK;
524 DT_RETURN_MARK(Throw, jint, (const jint&)ret);
526 THROW_OOP_(JNIHandles::resolve(obj), JNI_OK);
527 ShouldNotReachHere();
528 JNI_END
530 DT_RETURN_MARK_DECL(ThrowNew, jint);
532 JNI_ENTRY(jint, jni_ThrowNew(JNIEnv *env, jclass clazz, const char *message))
533 JNIWrapper("ThrowNew");
534 DTRACE_PROBE3(hotspot_jni, ThrowNew__entry, env, clazz, message);
535 jint ret = JNI_OK;
536 DT_RETURN_MARK(ThrowNew, jint, (const jint&)ret);
538 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
539 symbolHandle name = symbolHandle(THREAD, k->name());
540 Handle class_loader (THREAD, k->class_loader());
541 Handle protection_domain (THREAD, k->protection_domain());
542 THROW_MSG_LOADER_(name, (char *)message, class_loader, protection_domain, JNI_OK);
543 ShouldNotReachHere();
544 JNI_END
547 // JNI functions only transform a pending async exception to a synchronous
548 // exception in ExceptionOccurred and ExceptionCheck calls, since
549 // delivering an async exception in other places won't change the native
550 // code's control flow and would be harmful when native code further calls
551 // JNI functions with a pending exception. Async exception is also checked
552 // during the call, so ExceptionOccurred/ExceptionCheck won't return
553 // false but deliver the async exception at the very end during
554 // state transition.
556 static void jni_check_async_exceptions(JavaThread *thread) {
557 assert(thread == Thread::current(), "must be itself");
558 thread->check_and_handle_async_exceptions();
559 }
561 JNI_ENTRY_NO_PRESERVE(jthrowable, jni_ExceptionOccurred(JNIEnv *env))
562 JNIWrapper("ExceptionOccurred");
563 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__entry, env);
564 jni_check_async_exceptions(thread);
565 oop exception = thread->pending_exception();
566 jthrowable ret = (jthrowable) JNIHandles::make_local(env, exception);
567 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__return, ret);
568 return ret;
569 JNI_END
572 JNI_ENTRY_NO_PRESERVE(void, jni_ExceptionDescribe(JNIEnv *env))
573 JNIWrapper("ExceptionDescribe");
574 DTRACE_PROBE1(hotspot_jni, ExceptionDescribe__entry, env);
575 if (thread->has_pending_exception()) {
576 Handle ex(thread, thread->pending_exception());
577 thread->clear_pending_exception();
578 if (ex->is_a(SystemDictionary::threaddeath_klass())) {
579 // Don't print anything if we are being killed.
580 } else {
581 jio_fprintf(defaultStream::error_stream(), "Exception ");
582 if (thread != NULL && thread->threadObj() != NULL) {
583 ResourceMark rm(THREAD);
584 jio_fprintf(defaultStream::error_stream(),
585 "in thread \"%s\" ", thread->get_thread_name());
586 }
587 if (ex->is_a(SystemDictionary::throwable_klass())) {
588 JavaValue result(T_VOID);
589 JavaCalls::call_virtual(&result,
590 ex,
591 KlassHandle(THREAD,
592 SystemDictionary::throwable_klass()),
593 vmSymbolHandles::printStackTrace_name(),
594 vmSymbolHandles::void_method_signature(),
595 THREAD);
596 // If an exception is thrown in the call it gets thrown away. Not much
597 // we can do with it. The native code that calls this, does not check
598 // for the exception - hence, it might still be in the thread when DestroyVM gets
599 // called, potentially causing a few asserts to trigger - since no pending exception
600 // is expected.
601 CLEAR_PENDING_EXCEPTION;
602 } else {
603 ResourceMark rm(THREAD);
604 jio_fprintf(defaultStream::error_stream(),
605 ". Uncaught exception of type %s.",
606 Klass::cast(ex->klass())->external_name());
607 }
608 }
609 }
610 DTRACE_PROBE(hotspot_jni, ExceptionDescribe__return);
611 JNI_END
614 JNI_QUICK_ENTRY(void, jni_ExceptionClear(JNIEnv *env))
615 JNIWrapper("ExceptionClear");
616 DTRACE_PROBE1(hotspot_jni, ExceptionClear__entry, env);
618 // The jni code might be using this API to clear java thrown exception.
619 // So just mark jvmti thread exception state as exception caught.
620 JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state();
621 if (state != NULL && state->is_exception_detected()) {
622 state->set_exception_caught();
623 }
624 thread->clear_pending_exception();
625 DTRACE_PROBE(hotspot_jni, ExceptionClear__return);
626 JNI_END
629 JNI_ENTRY(void, jni_FatalError(JNIEnv *env, const char *msg))
630 JNIWrapper("FatalError");
631 DTRACE_PROBE2(hotspot_jni, FatalError__entry, env, msg);
632 tty->print_cr("FATAL ERROR in native method: %s", msg);
633 thread->print_stack();
634 os::abort(); // Dump core and abort
635 JNI_END
638 JNI_ENTRY(jint, jni_PushLocalFrame(JNIEnv *env, jint capacity))
639 JNIWrapper("PushLocalFrame");
640 DTRACE_PROBE2(hotspot_jni, PushLocalFrame__entry, env, capacity);
641 //%note jni_11
642 if (capacity < 0 && capacity > MAX_REASONABLE_LOCAL_CAPACITY) {
643 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, JNI_ERR);
644 return JNI_ERR;
645 }
646 JNIHandleBlock* old_handles = thread->active_handles();
647 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
648 assert(new_handles != NULL, "should not be NULL");
649 new_handles->set_pop_frame_link(old_handles);
650 thread->set_active_handles(new_handles);
651 jint ret = JNI_OK;
652 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, ret);
653 return ret;
654 JNI_END
657 JNI_ENTRY(jobject, jni_PopLocalFrame(JNIEnv *env, jobject result))
658 JNIWrapper("PopLocalFrame");
659 DTRACE_PROBE2(hotspot_jni, PopLocalFrame__entry, env, result);
660 //%note jni_11
661 Handle result_handle(thread, JNIHandles::resolve(result));
662 JNIHandleBlock* old_handles = thread->active_handles();
663 JNIHandleBlock* new_handles = old_handles->pop_frame_link();
664 if (new_handles != NULL) {
665 // As a sanity check we only release the handle blocks if the pop_frame_link is not NULL.
666 // This way code will still work if PopLocalFrame is called without a corresponding
667 // PushLocalFrame call. Note that we set the pop_frame_link to NULL explicitly, otherwise
668 // the release_block call will release the blocks.
669 thread->set_active_handles(new_handles);
670 old_handles->set_pop_frame_link(NULL); // clear link we won't release new_handles below
671 JNIHandleBlock::release_block(old_handles, thread); // may block
672 result = JNIHandles::make_local(thread, result_handle());
673 }
674 DTRACE_PROBE1(hotspot_jni, PopLocalFrame__return, result);
675 return result;
676 JNI_END
679 JNI_ENTRY(jobject, jni_NewGlobalRef(JNIEnv *env, jobject ref))
680 JNIWrapper("NewGlobalRef");
681 DTRACE_PROBE2(hotspot_jni, NewGlobalRef__entry, env, ref);
682 Handle ref_handle(thread, JNIHandles::resolve(ref));
683 jobject ret = JNIHandles::make_global(ref_handle);
684 DTRACE_PROBE1(hotspot_jni, NewGlobalRef__return, ret);
685 return ret;
686 JNI_END
688 // Must be JNI_ENTRY (with HandleMark)
689 JNI_ENTRY_NO_PRESERVE(void, jni_DeleteGlobalRef(JNIEnv *env, jobject ref))
690 JNIWrapper("DeleteGlobalRef");
691 DTRACE_PROBE2(hotspot_jni, DeleteGlobalRef__entry, env, ref);
692 JNIHandles::destroy_global(ref);
693 DTRACE_PROBE(hotspot_jni, DeleteGlobalRef__return);
694 JNI_END
696 JNI_QUICK_ENTRY(void, jni_DeleteLocalRef(JNIEnv *env, jobject obj))
697 JNIWrapper("DeleteLocalRef");
698 DTRACE_PROBE2(hotspot_jni, DeleteLocalRef__entry, env, obj);
699 JNIHandles::destroy_local(obj);
700 DTRACE_PROBE(hotspot_jni, DeleteLocalRef__return);
701 JNI_END
703 JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2))
704 JNIWrapper("IsSameObject");
705 DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2);
706 oop a = JNIHandles::resolve(r1);
707 oop b = JNIHandles::resolve(r2);
708 jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE;
709 DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret);
710 return ret;
711 JNI_END
714 JNI_ENTRY(jobject, jni_NewLocalRef(JNIEnv *env, jobject ref))
715 JNIWrapper("NewLocalRef");
716 DTRACE_PROBE2(hotspot_jni, NewLocalRef__entry, env, ref);
717 jobject ret = JNIHandles::make_local(env, JNIHandles::resolve(ref));
718 DTRACE_PROBE1(hotspot_jni, NewLocalRef__return, ret);
719 return ret;
720 JNI_END
722 JNI_LEAF(jint, jni_EnsureLocalCapacity(JNIEnv *env, jint capacity))
723 JNIWrapper("EnsureLocalCapacity");
724 DTRACE_PROBE2(hotspot_jni, EnsureLocalCapacity__entry, env, capacity);
725 jint ret;
726 if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) {
727 ret = JNI_OK;
728 } else {
729 ret = JNI_ERR;
730 }
731 DTRACE_PROBE1(hotspot_jni, EnsureLocalCapacity__return, ret);
732 return ret;
733 JNI_END
735 // Return the Handle Type
736 JNI_LEAF(jobjectRefType, jni_GetObjectRefType(JNIEnv *env, jobject obj))
737 JNIWrapper("GetObjectRefType");
738 DTRACE_PROBE2(hotspot_jni, GetObjectRefType__entry, env, obj);
739 jobjectRefType ret;
740 if (JNIHandles::is_local_handle(thread, obj) ||
741 JNIHandles::is_frame_handle(thread, obj))
742 ret = JNILocalRefType;
743 else if (JNIHandles::is_global_handle(obj))
744 ret = JNIGlobalRefType;
745 else if (JNIHandles::is_weak_global_handle(obj))
746 ret = JNIWeakGlobalRefType;
747 else
748 ret = JNIInvalidRefType;
749 DTRACE_PROBE1(hotspot_jni, GetObjectRefType__return, ret);
750 return ret;
751 JNI_END
754 class JNI_ArgumentPusher : public SignatureIterator {
755 protected:
756 JavaCallArguments* _arguments;
758 virtual void get_bool () = 0;
759 virtual void get_char () = 0;
760 virtual void get_short () = 0;
761 virtual void get_byte () = 0;
762 virtual void get_int () = 0;
763 virtual void get_long () = 0;
764 virtual void get_float () = 0;
765 virtual void get_double () = 0;
766 virtual void get_object () = 0;
768 JNI_ArgumentPusher(Thread *thread, symbolOop signature)
769 : SignatureIterator(thread, signature) {
770 this->_return_type = T_ILLEGAL;
771 _arguments = NULL;
772 }
774 public:
775 virtual void iterate( uint64_t fingerprint ) = 0;
777 void set_java_argument_object(JavaCallArguments *arguments) { _arguments = arguments; }
779 inline void do_bool() { if (!is_return_type()) get_bool(); }
780 inline void do_char() { if (!is_return_type()) get_char(); }
781 inline void do_short() { if (!is_return_type()) get_short(); }
782 inline void do_byte() { if (!is_return_type()) get_byte(); }
783 inline void do_int() { if (!is_return_type()) get_int(); }
784 inline void do_long() { if (!is_return_type()) get_long(); }
785 inline void do_float() { if (!is_return_type()) get_float(); }
786 inline void do_double() { if (!is_return_type()) get_double(); }
787 inline void do_object(int begin, int end) { if (!is_return_type()) get_object(); }
788 inline void do_array(int begin, int end) { if (!is_return_type()) get_object(); } // do_array uses get_object -- there is no get_array
789 inline void do_void() { }
791 JavaCallArguments* arguments() { return _arguments; }
792 void push_receiver(Handle h) { _arguments->push_oop(h); }
793 };
796 class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher {
797 protected:
798 va_list _ap;
800 inline void get_bool() { _arguments->push_int(va_arg(_ap, jint)); } // bool is coerced to int when using va_arg
801 inline void get_char() { _arguments->push_int(va_arg(_ap, jint)); } // char is coerced to int when using va_arg
802 inline void get_short() { _arguments->push_int(va_arg(_ap, jint)); } // short is coerced to int when using va_arg
803 inline void get_byte() { _arguments->push_int(va_arg(_ap, jint)); } // byte is coerced to int when using va_arg
804 inline void get_int() { _arguments->push_int(va_arg(_ap, jint)); }
806 // each of these paths is exercized by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
808 inline void get_long() { _arguments->push_long(va_arg(_ap, jlong)); }
809 inline void get_float() { _arguments->push_float((jfloat)va_arg(_ap, jdouble)); } // float is coerced to double w/ va_arg
810 inline void get_double() { _arguments->push_double(va_arg(_ap, jdouble)); }
811 inline void get_object() { jobject l = va_arg(_ap, jobject);
812 _arguments->push_oop(Handle((oop *)l, false)); }
814 inline void set_ap(va_list rap) {
815 #ifdef va_copy
816 va_copy(_ap, rap);
817 #elif defined (__va_copy)
818 __va_copy(_ap, rap);
819 #else
820 _ap = rap;
821 #endif
822 }
824 public:
825 JNI_ArgumentPusherVaArg(Thread *thread, symbolOop signature, va_list rap)
826 : JNI_ArgumentPusher(thread, signature) {
827 set_ap(rap);
828 }
829 JNI_ArgumentPusherVaArg(Thread *thread, jmethodID method_id, va_list rap)
830 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
831 set_ap(rap);
832 }
834 // Optimized path if we have the bitvector form of signature
835 void iterate( uint64_t fingerprint ) {
836 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate();// Must be too many arguments
837 else {
838 _return_type = (BasicType)((fingerprint >> static_feature_size) &
839 result_feature_mask);
841 assert(fingerprint, "Fingerprint should not be 0");
842 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
843 while ( 1 ) {
844 switch ( fingerprint & parameter_feature_mask ) {
845 case bool_parm:
846 case char_parm:
847 case short_parm:
848 case byte_parm:
849 case int_parm:
850 get_int();
851 break;
852 case obj_parm:
853 get_object();
854 break;
855 case long_parm:
856 get_long();
857 break;
858 case float_parm:
859 get_float();
860 break;
861 case double_parm:
862 get_double();
863 break;
864 case done_parm:
865 return;
866 break;
867 default:
868 ShouldNotReachHere();
869 break;
870 }
871 fingerprint >>= parameter_feature_size;
872 }
873 }
874 }
875 };
878 class JNI_ArgumentPusherArray : public JNI_ArgumentPusher {
879 protected:
880 const jvalue *_ap;
882 inline void get_bool() { _arguments->push_int((jint)(_ap++)->z); }
883 inline void get_char() { _arguments->push_int((jint)(_ap++)->c); }
884 inline void get_short() { _arguments->push_int((jint)(_ap++)->s); }
885 inline void get_byte() { _arguments->push_int((jint)(_ap++)->b); }
886 inline void get_int() { _arguments->push_int((jint)(_ap++)->i); }
888 inline void get_long() { _arguments->push_long((_ap++)->j); }
889 inline void get_float() { _arguments->push_float((_ap++)->f); }
890 inline void get_double() { _arguments->push_double((_ap++)->d);}
891 inline void get_object() { _arguments->push_oop(Handle((oop *)(_ap++)->l, false)); }
893 inline void set_ap(const jvalue *rap) { _ap = rap; }
895 public:
896 JNI_ArgumentPusherArray(Thread *thread, symbolOop signature, const jvalue *rap)
897 : JNI_ArgumentPusher(thread, signature) {
898 set_ap(rap);
899 }
900 JNI_ArgumentPusherArray(Thread *thread, jmethodID method_id, const jvalue *rap)
901 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
902 set_ap(rap);
903 }
905 // Optimized path if we have the bitvector form of signature
906 void iterate( uint64_t fingerprint ) {
907 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate(); // Must be too many arguments
908 else {
909 _return_type = (BasicType)((fingerprint >> static_feature_size) &
910 result_feature_mask);
911 assert(fingerprint, "Fingerprint should not be 0");
912 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
913 while ( 1 ) {
914 switch ( fingerprint & parameter_feature_mask ) {
915 case bool_parm:
916 get_bool();
917 break;
918 case char_parm:
919 get_char();
920 break;
921 case short_parm:
922 get_short();
923 break;
924 case byte_parm:
925 get_byte();
926 break;
927 case int_parm:
928 get_int();
929 break;
930 case obj_parm:
931 get_object();
932 break;
933 case long_parm:
934 get_long();
935 break;
936 case float_parm:
937 get_float();
938 break;
939 case double_parm:
940 get_double();
941 break;
942 case done_parm:
943 return;
944 break;
945 default:
946 ShouldNotReachHere();
947 break;
948 }
949 fingerprint >>= parameter_feature_size;
950 }
951 }
952 }
953 };
956 enum JNICallType {
957 JNI_STATIC,
958 JNI_VIRTUAL,
959 JNI_NONVIRTUAL
960 };
962 static methodHandle jni_resolve_interface_call(Handle recv, methodHandle method, TRAPS) {
963 assert(!method.is_null() , "method should not be null");
965 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
966 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
967 KlassHandle spec_klass (THREAD, method->method_holder());
968 symbolHandle name (THREAD, method->name());
969 symbolHandle signature (THREAD, method->signature());
970 CallInfo info;
971 LinkResolver::resolve_interface_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
972 return info.selected_method();
973 }
975 static methodHandle jni_resolve_virtual_call(Handle recv, methodHandle method, TRAPS) {
976 assert(!method.is_null() , "method should not be null");
978 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
979 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
980 KlassHandle spec_klass (THREAD, method->method_holder());
981 symbolHandle name (THREAD, method->name());
982 symbolHandle signature (THREAD, method->signature());
983 CallInfo info;
984 LinkResolver::resolve_virtual_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
985 return info.selected_method();
986 }
990 static void jni_invoke_static(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
991 methodHandle method(THREAD, JNIHandles::resolve_jmethod_id(method_id));
993 // Create object to hold arguments for the JavaCall, and associate it with
994 // the jni parser
995 ResourceMark rm(THREAD);
996 int number_of_parameters = method->size_of_parameters();
997 JavaCallArguments java_args(number_of_parameters);
998 args->set_java_argument_object(&java_args);
1000 assert(method->is_static(), "method should be static");
1002 // Fill out JavaCallArguments object
1003 args->iterate( Fingerprinter(THREAD, method).fingerprint() );
1004 // Initialize result type
1005 result->set_type(args->get_ret_type());
1007 // Invoke the method. Result is returned as oop.
1008 JavaCalls::call(result, method, &java_args, CHECK);
1010 // Convert result
1011 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1012 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1013 }
1014 }
1017 static void jni_invoke_nonstatic(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
1018 oop recv = JNIHandles::resolve(receiver);
1019 if (recv == NULL) {
1020 THROW(vmSymbols::java_lang_NullPointerException());
1021 }
1022 Handle h_recv(THREAD, recv);
1024 int number_of_parameters;
1025 methodOop selected_method;
1026 {
1027 methodOop m = JNIHandles::resolve_jmethod_id(method_id);
1028 number_of_parameters = m->size_of_parameters();
1029 klassOop holder = m->method_holder();
1030 if (!(Klass::cast(holder))->is_interface()) {
1031 // non-interface call -- for that little speed boost, don't handlize
1032 debug_only(No_Safepoint_Verifier nosafepoint;)
1033 if (call_type == JNI_VIRTUAL) {
1034 // jni_GetMethodID makes sure class is linked and initialized
1035 // so m should have a valid vtable index.
1036 int vtbl_index = m->vtable_index();
1037 if (vtbl_index != methodOopDesc::nonvirtual_vtable_index) {
1038 klassOop k = h_recv->klass();
1039 // k might be an arrayKlassOop but all vtables start at
1040 // the same place. The cast is to avoid virtual call and assertion.
1041 instanceKlass *ik = (instanceKlass*)k->klass_part();
1042 selected_method = ik->method_at_vtable(vtbl_index);
1043 } else {
1044 // final method
1045 selected_method = m;
1046 }
1047 } else {
1048 // JNI_NONVIRTUAL call
1049 selected_method = m;
1050 }
1051 } else {
1052 // interface call
1053 KlassHandle h_holder(THREAD, holder);
1055 int itbl_index = m->cached_itable_index();
1056 if (itbl_index == -1) {
1057 itbl_index = klassItable::compute_itable_index(m);
1058 m->set_cached_itable_index(itbl_index);
1059 // the above may have grabbed a lock, 'm' and anything non-handlized can't be used again
1060 }
1061 klassOop k = h_recv->klass();
1062 selected_method = instanceKlass::cast(k)->method_at_itable(h_holder(), itbl_index, CHECK);
1063 }
1064 }
1066 methodHandle method(THREAD, selected_method);
1068 // Create object to hold arguments for the JavaCall, and associate it with
1069 // the jni parser
1070 ResourceMark rm(THREAD);
1071 JavaCallArguments java_args(number_of_parameters);
1072 args->set_java_argument_object(&java_args);
1074 // handle arguments
1075 assert(!method->is_static(), "method should not be static");
1076 args->push_receiver(h_recv); // Push jobject handle
1078 // Fill out JavaCallArguments object
1079 args->iterate( Fingerprinter(THREAD, method).fingerprint() );
1080 // Initialize result type
1081 result->set_type(args->get_ret_type());
1083 // Invoke the method. Result is returned as oop.
1084 JavaCalls::call(result, method, &java_args, CHECK);
1086 // Convert result
1087 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1088 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1089 }
1090 }
1093 static instanceOop alloc_object(jclass clazz, TRAPS) {
1094 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1095 Klass::cast(k())->check_valid_for_instantiation(false, CHECK_NULL);
1096 instanceKlass::cast(k())->initialize(CHECK_NULL);
1097 instanceOop ih = instanceKlass::cast(k())->allocate_instance(THREAD);
1098 return ih;
1099 }
1101 DT_RETURN_MARK_DECL(AllocObject, jobject);
1103 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
1104 JNIWrapper("AllocObject");
1106 DTRACE_PROBE2(hotspot_jni, AllocObject__entry, env, clazz);
1107 jobject ret = NULL;
1108 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
1110 instanceOop i = alloc_object(clazz, CHECK_NULL);
1111 ret = JNIHandles::make_local(env, i);
1112 return ret;
1113 JNI_END
1115 DT_RETURN_MARK_DECL(NewObjectA, jobject);
1117 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
1118 JNIWrapper("NewObjectA");
1119 DTRACE_PROBE3(hotspot_jni, NewObjectA__entry, env, clazz, methodID);
1120 jobject obj = NULL;
1121 DT_RETURN_MARK(NewObjectA, jobject, (const jobject)obj);
1123 instanceOop i = alloc_object(clazz, CHECK_NULL);
1124 obj = JNIHandles::make_local(env, i);
1125 JavaValue jvalue(T_VOID);
1126 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1127 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1128 return obj;
1129 JNI_END
1131 DT_RETURN_MARK_DECL(NewObjectV, jobject);
1133 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
1134 JNIWrapper("NewObjectV");
1135 DTRACE_PROBE3(hotspot_jni, NewObjectV__entry, env, clazz, methodID);
1136 jobject obj = NULL;
1137 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
1139 instanceOop i = alloc_object(clazz, CHECK_NULL);
1140 obj = JNIHandles::make_local(env, i);
1141 JavaValue jvalue(T_VOID);
1142 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1143 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1144 return obj;
1145 JNI_END
1147 DT_RETURN_MARK_DECL(NewObject, jobject);
1149 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1150 JNIWrapper("NewObject");
1151 DTRACE_PROBE3(hotspot_jni, NewObject__entry, env, clazz, methodID);
1152 jobject obj = NULL;
1153 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1155 instanceOop i = alloc_object(clazz, CHECK_NULL);
1156 obj = JNIHandles::make_local(env, i);
1157 va_list args;
1158 va_start(args, methodID);
1159 JavaValue jvalue(T_VOID);
1160 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1161 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1162 va_end(args);
1163 return obj;
1164 JNI_END
1167 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1168 JNIWrapper("GetObjectClass");
1169 DTRACE_PROBE2(hotspot_jni, GetObjectClass__entry, env, obj);
1170 klassOop k = JNIHandles::resolve_non_null(obj)->klass();
1171 jclass ret =
1172 (jclass) JNIHandles::make_local(env, Klass::cast(k)->java_mirror());
1173 DTRACE_PROBE1(hotspot_jni, GetObjectClass__return, ret);
1174 return ret;
1175 JNI_END
1177 JNI_QUICK_ENTRY(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1178 JNIWrapper("IsInstanceOf");
1179 DTRACE_PROBE3(hotspot_jni, IsInstanceOf__entry, env, obj, clazz);
1180 jboolean ret = JNI_TRUE;
1181 if (obj != NULL) {
1182 ret = JNI_FALSE;
1183 klassOop k = java_lang_Class::as_klassOop(
1184 JNIHandles::resolve_non_null(clazz));
1185 if (k != NULL) {
1186 ret = JNIHandles::resolve_non_null(obj)->is_a(k) ? JNI_TRUE : JNI_FALSE;
1187 }
1188 }
1189 DTRACE_PROBE1(hotspot_jni, IsInstanceOf__return, ret);
1190 return ret;
1191 JNI_END
1194 static jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name_str,
1195 const char *sig, bool is_static, TRAPS) {
1196 // %%%% This code should probably just call into a method in the LinkResolver
1197 //
1198 // The class should have been loaded (we have an instance of the class
1199 // passed in) so the method and signature should already be in the symbol
1200 // table. If they're not there, the method doesn't exist.
1201 symbolHandle signature =
1202 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1203 symbolHandle name;
1204 if (name_str == NULL) {
1205 name = vmSymbolHandles::object_initializer_name();
1206 } else {
1207 name = symbolHandle(THREAD,
1208 SymbolTable::probe(name_str, (int)strlen(name_str)));
1209 }
1210 if (name.is_null() || signature.is_null()) {
1211 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1212 }
1214 // Throw a NoSuchMethodError exception if we have an instance of a
1215 // primitive java.lang.Class
1216 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(clazz))) {
1217 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1218 }
1220 KlassHandle klass(THREAD,
1221 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1223 // Make sure class is linked and initialized before handing id's out to
1224 // methodOops.
1225 Klass::cast(klass())->initialize(CHECK_NULL);
1227 methodOop m;
1228 if (name() == vmSymbols::object_initializer_name() ||
1229 name() == vmSymbols::class_initializer_name()) {
1230 // Never search superclasses for constructors
1231 if (klass->oop_is_instance()) {
1232 m = instanceKlass::cast(klass())->find_method(name(), signature());
1233 } else {
1234 m = NULL;
1235 }
1236 } else {
1237 m = klass->lookup_method(name(), signature());
1238 // Look up interfaces
1239 if (m == NULL && klass->oop_is_instance()) {
1240 m = instanceKlass::cast(klass())->lookup_method_in_all_interfaces(name(),
1241 signature());
1242 }
1243 }
1244 if (m == NULL || (m->is_static() != is_static)) {
1245 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1246 }
1247 return m->jmethod_id();
1248 }
1251 JNI_ENTRY(jmethodID, jni_GetMethodID(JNIEnv *env, jclass clazz,
1252 const char *name, const char *sig))
1253 JNIWrapper("GetMethodID");
1254 DTRACE_PROBE4(hotspot_jni, GetMethodID__entry, env, clazz, name, sig);
1255 jmethodID ret = get_method_id(env, clazz, name, sig, false, thread);
1256 DTRACE_PROBE1(hotspot_jni, GetMethodID__return, ret);
1257 return ret;
1258 JNI_END
1261 JNI_ENTRY(jmethodID, jni_GetStaticMethodID(JNIEnv *env, jclass clazz,
1262 const char *name, const char *sig))
1263 JNIWrapper("GetStaticMethodID");
1264 DTRACE_PROBE4(hotspot_jni, GetStaticMethodID__entry, env, clazz, name, sig);
1265 jmethodID ret = get_method_id(env, clazz, name, sig, true, thread);
1266 DTRACE_PROBE1(hotspot_jni, GetStaticMethodID__return, ret);
1267 return ret;
1268 JNI_END
1272 //
1273 // Calling Methods
1274 //
1277 #define DEFINE_CALLMETHOD(ResultType, Result, Tag) \
1278 \
1279 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##Method, ResultType);\
1280 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodV, ResultType);\
1281 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodA, ResultType);\
1282 \
1283 JNI_ENTRY(ResultType, \
1284 jni_Call##Result##Method(JNIEnv *env, jobject obj, jmethodID methodID, ...)) \
1285 JNIWrapper("Call" XSTR(Result) "Method"); \
1286 \
1287 DTRACE_PROBE3(hotspot_jni, Call##Result##Method__entry, env, obj, methodID);\
1288 ResultType ret = 0;\
1289 DT_RETURN_MARK_FOR(Result, Call##Result##Method, ResultType, \
1290 (const ResultType&)ret);\
1291 \
1292 va_list args; \
1293 va_start(args, methodID); \
1294 JavaValue jvalue(Tag); \
1295 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1296 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1297 va_end(args); \
1298 ret = jvalue.get_##ResultType(); \
1299 return ret;\
1300 JNI_END \
1301 \
1302 \
1303 JNI_ENTRY(ResultType, \
1304 jni_Call##Result##MethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) \
1305 JNIWrapper("Call" XSTR(Result) "MethodV"); \
1306 \
1307 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodV__entry, env, obj, methodID);\
1308 ResultType ret = 0;\
1309 DT_RETURN_MARK_FOR(Result, Call##Result##MethodV, ResultType, \
1310 (const ResultType&)ret);\
1311 \
1312 JavaValue jvalue(Tag); \
1313 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1314 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1315 ret = jvalue.get_##ResultType(); \
1316 return ret;\
1317 JNI_END \
1318 \
1319 \
1320 JNI_ENTRY(ResultType, \
1321 jni_Call##Result##MethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) \
1322 JNIWrapper("Call" XSTR(Result) "MethodA"); \
1323 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodA__entry, env, obj, methodID);\
1324 ResultType ret = 0;\
1325 DT_RETURN_MARK_FOR(Result, Call##Result##MethodA, ResultType, \
1326 (const ResultType&)ret);\
1327 \
1328 JavaValue jvalue(Tag); \
1329 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1330 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1331 ret = jvalue.get_##ResultType(); \
1332 return ret;\
1333 JNI_END
1335 // the runtime type of subword integral basic types is integer
1336 DEFINE_CALLMETHOD(jboolean, Boolean, T_BOOLEAN)
1337 DEFINE_CALLMETHOD(jbyte, Byte, T_BYTE)
1338 DEFINE_CALLMETHOD(jchar, Char, T_CHAR)
1339 DEFINE_CALLMETHOD(jshort, Short, T_SHORT)
1341 DEFINE_CALLMETHOD(jobject, Object, T_OBJECT)
1342 DEFINE_CALLMETHOD(jint, Int, T_INT)
1343 DEFINE_CALLMETHOD(jlong, Long, T_LONG)
1344 DEFINE_CALLMETHOD(jfloat, Float, T_FLOAT)
1345 DEFINE_CALLMETHOD(jdouble, Double, T_DOUBLE)
1347 DT_VOID_RETURN_MARK_DECL(CallVoidMethod);
1348 DT_VOID_RETURN_MARK_DECL(CallVoidMethodV);
1349 DT_VOID_RETURN_MARK_DECL(CallVoidMethodA);
1351 JNI_ENTRY(void, jni_CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...))
1352 JNIWrapper("CallVoidMethod");
1353 DTRACE_PROBE3(hotspot_jni, CallVoidMethod__entry, env, obj, methodID);
1354 DT_VOID_RETURN_MARK(CallVoidMethod);
1356 va_list args;
1357 va_start(args, methodID);
1358 JavaValue jvalue(T_VOID);
1359 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1360 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1361 va_end(args);
1362 JNI_END
1365 JNI_ENTRY(void, jni_CallVoidMethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args))
1366 JNIWrapper("CallVoidMethodV");
1367 DTRACE_PROBE3(hotspot_jni, CallVoidMethodV__entry, env, obj, methodID);
1368 DT_VOID_RETURN_MARK(CallVoidMethodV);
1370 JavaValue jvalue(T_VOID);
1371 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1372 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1373 JNI_END
1376 JNI_ENTRY(void, jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args))
1377 JNIWrapper("CallVoidMethodA");
1378 DTRACE_PROBE3(hotspot_jni, CallVoidMethodA__entry, env, obj, methodID);
1379 DT_VOID_RETURN_MARK(CallVoidMethodA);
1381 JavaValue jvalue(T_VOID);
1382 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1383 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1384 JNI_END
1387 #define DEFINE_CALLNONVIRTUALMETHOD(ResultType, Result, Tag) \
1388 \
1389 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##Method, ResultType);\
1390 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodV, ResultType);\
1391 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodA, ResultType);\
1392 \
1393 JNI_ENTRY(ResultType, \
1394 jni_CallNonvirtual##Result##Method(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) \
1395 JNIWrapper("CallNonvitual" XSTR(Result) "Method"); \
1396 \
1397 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##Method__entry, env, obj, cls, methodID);\
1398 ResultType ret;\
1399 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##Method, ResultType, \
1400 (const ResultType&)ret);\
1401 \
1402 va_list args; \
1403 va_start(args, methodID); \
1404 JavaValue jvalue(Tag); \
1405 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1406 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1407 va_end(args); \
1408 ret = jvalue.get_##ResultType(); \
1409 return ret;\
1410 JNI_END \
1411 \
1412 JNI_ENTRY(ResultType, \
1413 jni_CallNonvirtual##Result##MethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) \
1414 JNIWrapper("CallNonvitual" XSTR(Result) "#MethodV"); \
1415 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodV__entry, env, obj, cls, methodID);\
1416 ResultType ret;\
1417 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodV, ResultType, \
1418 (const ResultType&)ret);\
1419 \
1420 JavaValue jvalue(Tag); \
1421 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1422 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1423 ret = jvalue.get_##ResultType(); \
1424 return ret;\
1425 JNI_END \
1426 \
1427 JNI_ENTRY(ResultType, \
1428 jni_CallNonvirtual##Result##MethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) \
1429 JNIWrapper("CallNonvitual" XSTR(Result) "MethodA"); \
1430 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodA__entry, env, obj, cls, methodID);\
1431 ResultType ret;\
1432 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodA, ResultType, \
1433 (const ResultType&)ret);\
1434 \
1435 JavaValue jvalue(Tag); \
1436 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1437 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1438 ret = jvalue.get_##ResultType(); \
1439 return ret;\
1440 JNI_END
1442 // the runtime type of subword integral basic types is integer
1443 DEFINE_CALLNONVIRTUALMETHOD(jboolean, Boolean, T_BOOLEAN)
1444 DEFINE_CALLNONVIRTUALMETHOD(jbyte, Byte, T_BYTE)
1445 DEFINE_CALLNONVIRTUALMETHOD(jchar, Char, T_CHAR)
1446 DEFINE_CALLNONVIRTUALMETHOD(jshort, Short, T_SHORT)
1448 DEFINE_CALLNONVIRTUALMETHOD(jobject, Object, T_OBJECT)
1449 DEFINE_CALLNONVIRTUALMETHOD(jint, Int, T_INT)
1450 DEFINE_CALLNONVIRTUALMETHOD(jlong, Long, T_LONG)
1451 DEFINE_CALLNONVIRTUALMETHOD(jfloat, Float, T_FLOAT)
1452 DEFINE_CALLNONVIRTUALMETHOD(jdouble, Double, T_DOUBLE)
1455 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethod);
1456 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodV);
1457 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodA);
1459 JNI_ENTRY(void, jni_CallNonvirtualVoidMethod(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...))
1460 JNIWrapper("CallNonvirtualVoidMethod");
1462 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethod__entry,
1463 env, obj, cls, methodID);
1464 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethod);
1466 va_list args;
1467 va_start(args, methodID);
1468 JavaValue jvalue(T_VOID);
1469 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1470 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1471 va_end(args);
1472 JNI_END
1475 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args))
1476 JNIWrapper("CallNonvirtualVoidMethodV");
1478 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodV__entry,
1479 env, obj, cls, methodID);
1480 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodV);
1482 JavaValue jvalue(T_VOID);
1483 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1484 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1485 JNI_END
1488 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args))
1489 JNIWrapper("CallNonvirtualVoidMethodA");
1490 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodA__entry,
1491 env, obj, cls, methodID);
1492 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodA);
1493 JavaValue jvalue(T_VOID);
1494 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1495 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1496 JNI_END
1499 #define DEFINE_CALLSTATICMETHOD(ResultType, Result, Tag) \
1500 \
1501 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##Method, ResultType);\
1502 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodV, ResultType);\
1503 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodA, ResultType);\
1504 \
1505 JNI_ENTRY(ResultType, \
1506 jni_CallStatic##Result##Method(JNIEnv *env, jclass cls, jmethodID methodID, ...)) \
1507 JNIWrapper("CallStatic" XSTR(Result) "Method"); \
1508 \
1509 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##Method__entry, env, cls, methodID);\
1510 ResultType ret = 0;\
1511 DT_RETURN_MARK_FOR(Result, CallStatic##Result##Method, ResultType, \
1512 (const ResultType&)ret);\
1513 \
1514 va_list args; \
1515 va_start(args, methodID); \
1516 JavaValue jvalue(Tag); \
1517 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1518 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1519 va_end(args); \
1520 ret = jvalue.get_##ResultType(); \
1521 return ret;\
1522 JNI_END \
1523 \
1524 JNI_ENTRY(ResultType, \
1525 jni_CallStatic##Result##MethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) \
1526 JNIWrapper("CallStatic" XSTR(Result) "MethodV"); \
1527 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodV__entry, env, cls, methodID);\
1528 ResultType ret = 0;\
1529 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodV, ResultType, \
1530 (const ResultType&)ret);\
1531 \
1532 JavaValue jvalue(Tag); \
1533 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1534 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1535 ret = jvalue.get_##ResultType(); \
1536 return ret;\
1537 JNI_END \
1538 \
1539 JNI_ENTRY(ResultType, \
1540 jni_CallStatic##Result##MethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) \
1541 JNIWrapper("CallStatic" XSTR(Result) "MethodA"); \
1542 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodA__entry, env, cls, methodID);\
1543 ResultType ret = 0;\
1544 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodA, ResultType, \
1545 (const ResultType&)ret);\
1546 \
1547 JavaValue jvalue(Tag); \
1548 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1549 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1550 ret = jvalue.get_##ResultType(); \
1551 return ret;\
1552 JNI_END
1554 // the runtime type of subword integral basic types is integer
1555 DEFINE_CALLSTATICMETHOD(jboolean, Boolean, T_BOOLEAN)
1556 DEFINE_CALLSTATICMETHOD(jbyte, Byte, T_BYTE)
1557 DEFINE_CALLSTATICMETHOD(jchar, Char, T_CHAR)
1558 DEFINE_CALLSTATICMETHOD(jshort, Short, T_SHORT)
1560 DEFINE_CALLSTATICMETHOD(jobject, Object, T_OBJECT)
1561 DEFINE_CALLSTATICMETHOD(jint, Int, T_INT)
1562 DEFINE_CALLSTATICMETHOD(jlong, Long, T_LONG)
1563 DEFINE_CALLSTATICMETHOD(jfloat, Float, T_FLOAT)
1564 DEFINE_CALLSTATICMETHOD(jdouble, Double, T_DOUBLE)
1567 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethod);
1568 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodV);
1569 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodA);
1571 JNI_ENTRY(void, jni_CallStaticVoidMethod(JNIEnv *env, jclass cls, jmethodID methodID, ...))
1572 JNIWrapper("CallStaticVoidMethod");
1573 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethod__entry, env, cls, methodID);
1574 DT_VOID_RETURN_MARK(CallStaticVoidMethod);
1576 va_list args;
1577 va_start(args, methodID);
1578 JavaValue jvalue(T_VOID);
1579 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1580 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1581 va_end(args);
1582 JNI_END
1585 JNI_ENTRY(void, jni_CallStaticVoidMethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args))
1586 JNIWrapper("CallStaticVoidMethodV");
1587 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodV__entry, env, cls, methodID);
1588 DT_VOID_RETURN_MARK(CallStaticVoidMethodV);
1590 JavaValue jvalue(T_VOID);
1591 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1592 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1593 JNI_END
1596 JNI_ENTRY(void, jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args))
1597 JNIWrapper("CallStaticVoidMethodA");
1598 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodA__entry, env, cls, methodID);
1599 DT_VOID_RETURN_MARK(CallStaticVoidMethodA);
1601 JavaValue jvalue(T_VOID);
1602 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1603 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1604 JNI_END
1607 //
1608 // Accessing Fields
1609 //
1612 DT_RETURN_MARK_DECL(GetFieldID, jfieldID);
1614 JNI_ENTRY(jfieldID, jni_GetFieldID(JNIEnv *env, jclass clazz,
1615 const char *name, const char *sig))
1616 JNIWrapper("GetFieldID");
1617 DTRACE_PROBE4(hotspot_jni, GetFieldID__entry, env, clazz, name, sig);
1618 jfieldID ret = 0;
1619 DT_RETURN_MARK(GetFieldID, jfieldID, (const jfieldID&)ret);
1621 // The class should have been loaded (we have an instance of the class
1622 // passed in) so the field and signature should already be in the symbol
1623 // table. If they're not there, the field doesn't exist.
1624 symbolHandle fieldname =
1625 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
1626 symbolHandle signame =
1627 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1628 if (fieldname.is_null() || signame.is_null()) {
1629 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1630 }
1631 KlassHandle k(THREAD,
1632 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1633 // Make sure class is initialized before handing id's out to fields
1634 Klass::cast(k())->initialize(CHECK_NULL);
1636 fieldDescriptor fd;
1637 if (!Klass::cast(k())->oop_is_instance() ||
1638 !instanceKlass::cast(k())->find_field(fieldname(), signame(), false, &fd)) {
1639 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1640 }
1642 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1643 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1644 ret = jfieldIDWorkaround::to_instance_jfieldID(k(), fd.offset());
1645 return ret;
1646 JNI_END
1649 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1650 JNIWrapper("GetObjectField");
1651 DTRACE_PROBE3(hotspot_jni, GetObjectField__entry, env, obj, fieldID);
1652 oop o = JNIHandles::resolve_non_null(obj);
1653 klassOop k = o->klass();
1654 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1655 // Keep JVMTI addition small and only check enabled flag here.
1656 // jni_GetField_probe() assumes that is okay to create handles.
1657 if (JvmtiExport::should_post_field_access()) {
1658 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1659 }
1660 jobject ret = JNIHandles::make_local(env, o->obj_field(offset));
1661 DTRACE_PROBE1(hotspot_jni, GetObjectField__return, ret);
1662 return ret;
1663 JNI_END
1666 #define DEFINE_GETFIELD(Return,Fieldname,Result) \
1667 \
1668 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return);\
1669 \
1670 JNI_QUICK_ENTRY(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1671 JNIWrapper("Get" XSTR(Result) "Field"); \
1672 \
1673 DTRACE_PROBE3(hotspot_jni, Get##Result##Field__entry, env, obj, fieldID);\
1674 Return ret = 0;\
1675 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1676 \
1677 oop o = JNIHandles::resolve_non_null(obj); \
1678 klassOop k = o->klass(); \
1679 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1680 /* Keep JVMTI addition small and only check enabled flag here. */ \
1681 /* jni_GetField_probe_nh() assumes that is not okay to create handles */ \
1682 /* and creates a ResetNoHandleMark. */ \
1683 if (JvmtiExport::should_post_field_access()) { \
1684 o = JvmtiExport::jni_GetField_probe_nh(thread, obj, o, k, fieldID, false); \
1685 } \
1686 ret = o->Fieldname##_field(offset); \
1687 return ret; \
1688 JNI_END
1690 DEFINE_GETFIELD(jboolean, bool, Boolean)
1691 DEFINE_GETFIELD(jbyte, byte, Byte)
1692 DEFINE_GETFIELD(jchar, char, Char)
1693 DEFINE_GETFIELD(jshort, short, Short)
1694 DEFINE_GETFIELD(jint, int, Int)
1695 DEFINE_GETFIELD(jlong, long, Long)
1696 DEFINE_GETFIELD(jfloat, float, Float)
1697 DEFINE_GETFIELD(jdouble, double, Double)
1699 address jni_GetBooleanField_addr() {
1700 return (address)jni_GetBooleanField;
1701 }
1702 address jni_GetByteField_addr() {
1703 return (address)jni_GetByteField;
1704 }
1705 address jni_GetCharField_addr() {
1706 return (address)jni_GetCharField;
1707 }
1708 address jni_GetShortField_addr() {
1709 return (address)jni_GetShortField;
1710 }
1711 address jni_GetIntField_addr() {
1712 return (address)jni_GetIntField;
1713 }
1714 address jni_GetLongField_addr() {
1715 return (address)jni_GetLongField;
1716 }
1717 address jni_GetFloatField_addr() {
1718 return (address)jni_GetFloatField;
1719 }
1720 address jni_GetDoubleField_addr() {
1721 return (address)jni_GetDoubleField;
1722 }
1724 JNI_QUICK_ENTRY(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1725 JNIWrapper("SetObjectField");
1726 DTRACE_PROBE4(hotspot_jni, SetObjectField__entry, env, obj, fieldID, value);
1727 oop o = JNIHandles::resolve_non_null(obj);
1728 klassOop k = o->klass();
1729 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1730 // Keep JVMTI addition small and only check enabled flag here.
1731 // jni_SetField_probe_nh() assumes that is not okay to create handles
1732 // and creates a ResetNoHandleMark.
1733 if (JvmtiExport::should_post_field_modification()) {
1734 jvalue field_value;
1735 field_value.l = value;
1736 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, 'L', (jvalue *)&field_value);
1737 }
1738 o->obj_field_put(offset, JNIHandles::resolve(value));
1739 DTRACE_PROBE(hotspot_jni, SetObjectField__return);
1740 JNI_END
1742 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType) \
1743 \
1744 JNI_QUICK_ENTRY(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1745 JNIWrapper("Set" XSTR(Result) "Field"); \
1746 \
1747 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, Set##Result##Field__entry, \
1748 ( JNIEnv*, jobject, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1749 HS_DTRACE_PROBE_N(hotspot_jni, Set##Result##Field__entry, \
1750 ( env, obj, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1751 \
1752 oop o = JNIHandles::resolve_non_null(obj); \
1753 klassOop k = o->klass(); \
1754 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1755 /* Keep JVMTI addition small and only check enabled flag here. */ \
1756 /* jni_SetField_probe_nh() assumes that is not okay to create handles */ \
1757 /* and creates a ResetNoHandleMark. */ \
1758 if (JvmtiExport::should_post_field_modification()) { \
1759 jvalue field_value; \
1760 field_value.unionType = value; \
1761 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \
1762 } \
1763 o->Fieldname##_field_put(offset, value); \
1764 DTRACE_PROBE(hotspot_jni, Set##Result##Field__return);\
1765 JNI_END
1767 DEFINE_SETFIELD(jboolean, bool, Boolean, 'Z', z)
1768 DEFINE_SETFIELD(jbyte, byte, Byte, 'B', b)
1769 DEFINE_SETFIELD(jchar, char, Char, 'C', c)
1770 DEFINE_SETFIELD(jshort, short, Short, 'S', s)
1771 DEFINE_SETFIELD(jint, int, Int, 'I', i)
1772 DEFINE_SETFIELD(jlong, long, Long, 'J', j)
1773 DEFINE_SETFIELD(jfloat, float, Float, 'F', f)
1774 DEFINE_SETFIELD(jdouble, double, Double, 'D', d)
1776 DT_RETURN_MARK_DECL(ToReflectedField, jobject);
1778 JNI_ENTRY(jobject, jni_ToReflectedField(JNIEnv *env, jclass cls, jfieldID fieldID, jboolean isStatic))
1779 JNIWrapper("ToReflectedField");
1780 DTRACE_PROBE4(hotspot_jni, ToReflectedField__entry,
1781 env, cls, fieldID, isStatic);
1782 jobject ret = NULL;
1783 DT_RETURN_MARK(ToReflectedField, jobject, (const jobject&)ret);
1785 fieldDescriptor fd;
1786 bool found = false;
1787 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(cls));
1789 assert(jfieldIDWorkaround::is_static_jfieldID(fieldID) == (isStatic != 0), "invalid fieldID");
1791 if (isStatic) {
1792 // Static field. The fieldID a JNIid specifying the field holder and the offset within the klassOop.
1793 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1794 assert(id->is_static_field_id(), "invalid static field id");
1795 found = instanceKlass::cast(id->holder())->find_local_field_from_offset(id->offset(), true, &fd);
1796 } else {
1797 // Non-static field. The fieldID is really the offset of the field within the instanceOop.
1798 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1799 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, &fd);
1800 }
1801 assert(found, "bad fieldID passed into jni_ToReflectedField");
1802 oop reflected = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
1803 ret = JNIHandles::make_local(env, reflected);
1804 return ret;
1805 JNI_END
1808 //
1809 // Accessing Static Fields
1810 //
1811 DT_RETURN_MARK_DECL(GetStaticFieldID, jfieldID);
1813 JNI_ENTRY(jfieldID, jni_GetStaticFieldID(JNIEnv *env, jclass clazz,
1814 const char *name, const char *sig))
1815 JNIWrapper("GetStaticFieldID");
1816 DTRACE_PROBE4(hotspot_jni, GetStaticFieldID__entry, env, clazz, name, sig);
1817 jfieldID ret = NULL;
1818 DT_RETURN_MARK(GetStaticFieldID, jfieldID, (const jfieldID&)ret);
1820 // The class should have been loaded (we have an instance of the class
1821 // passed in) so the field and signature should already be in the symbol
1822 // table. If they're not there, the field doesn't exist.
1823 symbolHandle fieldname =
1824 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
1825 symbolHandle signame =
1826 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1827 if (fieldname.is_null() || signame.is_null()) {
1828 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1829 }
1830 KlassHandle k(THREAD,
1831 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1832 // Make sure class is initialized before handing id's out to static fields
1833 Klass::cast(k())->initialize(CHECK_NULL);
1835 fieldDescriptor fd;
1836 if (!Klass::cast(k())->oop_is_instance() ||
1837 !instanceKlass::cast(k())->find_field(fieldname(), signame(), true, &fd)) {
1838 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1839 }
1841 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
1842 JNIid* id = instanceKlass::cast(fd.field_holder())->jni_id_for(fd.offset());
1843 debug_only(id->set_is_static_field_id();)
1845 debug_only(int first_offset = instanceKlass::cast(fd.field_holder())->offset_of_static_fields();)
1846 debug_only(int end_offset = first_offset + (instanceKlass::cast(fd.field_holder())->static_field_size() * wordSize);)
1847 assert(id->offset() >= first_offset && id->offset() < end_offset, "invalid static field offset");
1849 ret = jfieldIDWorkaround::to_static_jfieldID(id);
1850 return ret;
1851 JNI_END
1854 JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID))
1855 JNIWrapper("GetStaticObjectField");
1856 DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID);
1857 #ifndef JNICHECK_KERNEL
1858 DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);)
1859 #endif // JNICHECK_KERNEL
1860 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1861 assert(id->is_static_field_id(), "invalid static field id");
1862 // Keep JVMTI addition small and only check enabled flag here.
1863 // jni_GetField_probe() assumes that is okay to create handles.
1864 if (JvmtiExport::should_post_field_access()) {
1865 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true);
1866 }
1867 jobject ret = JNIHandles::make_local(id->holder()->obj_field(id->offset()));
1868 DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret);
1869 return ret;
1870 JNI_END
1872 #define DEFINE_GETSTATICFIELD(Return,Fieldname,Result) \
1873 \
1874 DT_RETURN_MARK_DECL_FOR(Result, GetStatic##Result##Field, Return);\
1875 \
1876 JNI_ENTRY(Return, jni_GetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID)) \
1877 JNIWrapper("GetStatic" XSTR(Result) "Field"); \
1878 DTRACE_PROBE3(hotspot_jni, GetStatic##Result##Field__entry, env, clazz, fieldID);\
1879 Return ret = 0;\
1880 DT_RETURN_MARK_FOR(Result, GetStatic##Result##Field, Return, \
1881 (const Return&)ret);\
1882 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1883 assert(id->is_static_field_id(), "invalid static field id"); \
1884 /* Keep JVMTI addition small and only check enabled flag here. */ \
1885 /* jni_GetField_probe() assumes that is okay to create handles. */ \
1886 if (JvmtiExport::should_post_field_access()) { \
1887 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); \
1888 } \
1889 ret = id->holder()-> Fieldname##_field (id->offset()); \
1890 return ret;\
1891 JNI_END
1893 DEFINE_GETSTATICFIELD(jboolean, bool, Boolean)
1894 DEFINE_GETSTATICFIELD(jbyte, byte, Byte)
1895 DEFINE_GETSTATICFIELD(jchar, char, Char)
1896 DEFINE_GETSTATICFIELD(jshort, short, Short)
1897 DEFINE_GETSTATICFIELD(jint, int, Int)
1898 DEFINE_GETSTATICFIELD(jlong, long, Long)
1899 DEFINE_GETSTATICFIELD(jfloat, float, Float)
1900 DEFINE_GETSTATICFIELD(jdouble, double, Double)
1903 JNI_ENTRY(void, jni_SetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID, jobject value))
1904 JNIWrapper("SetStaticObjectField");
1905 DTRACE_PROBE4(hotspot_jni, SetStaticObjectField__entry, env, clazz, fieldID, value);
1906 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1907 assert(id->is_static_field_id(), "invalid static field id");
1908 // Keep JVMTI addition small and only check enabled flag here.
1909 // jni_SetField_probe() assumes that is okay to create handles.
1910 if (JvmtiExport::should_post_field_modification()) {
1911 jvalue field_value;
1912 field_value.l = value;
1913 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, 'L', (jvalue *)&field_value);
1914 }
1915 id->holder()->obj_field_put(id->offset(), JNIHandles::resolve(value));
1916 DTRACE_PROBE(hotspot_jni, SetStaticObjectField__return);
1917 JNI_END
1920 #define DEFINE_SETSTATICFIELD(Argument,Fieldname,Result,SigType,unionType) \
1921 \
1922 JNI_ENTRY(void, jni_SetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID, Argument value)) \
1923 JNIWrapper("SetStatic" XSTR(Result) "Field"); \
1924 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, SetStatic##Result##Field__entry,\
1925 ( JNIEnv*, jclass, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1926 HS_DTRACE_PROBE_N(hotspot_jni, SetStatic##Result##Field__entry, \
1927 ( env, clazz, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1928 \
1929 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1930 assert(id->is_static_field_id(), "invalid static field id"); \
1931 /* Keep JVMTI addition small and only check enabled flag here. */ \
1932 /* jni_SetField_probe() assumes that is okay to create handles. */ \
1933 if (JvmtiExport::should_post_field_modification()) { \
1934 jvalue field_value; \
1935 field_value.unionType = value; \
1936 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, SigType, (jvalue *)&field_value); \
1937 } \
1938 id->holder()-> Fieldname##_field_put (id->offset(), value); \
1939 DTRACE_PROBE(hotspot_jni, SetStatic##Result##Field__return);\
1940 JNI_END
1942 DEFINE_SETSTATICFIELD(jboolean, bool, Boolean, 'Z', z)
1943 DEFINE_SETSTATICFIELD(jbyte, byte, Byte, 'B', b)
1944 DEFINE_SETSTATICFIELD(jchar, char, Char, 'C', c)
1945 DEFINE_SETSTATICFIELD(jshort, short, Short, 'S', s)
1946 DEFINE_SETSTATICFIELD(jint, int, Int, 'I', i)
1947 DEFINE_SETSTATICFIELD(jlong, long, Long, 'J', j)
1948 DEFINE_SETSTATICFIELD(jfloat, float, Float, 'F', f)
1949 DEFINE_SETSTATICFIELD(jdouble, double, Double, 'D', d)
1952 //
1953 // String Operations
1954 //
1956 // Unicode Interface
1958 DT_RETURN_MARK_DECL(NewString, jstring);
1960 JNI_ENTRY(jstring, jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len))
1961 JNIWrapper("NewString");
1962 DTRACE_PROBE3(hotspot_jni, NewString__entry, env, unicodeChars, len);
1963 jstring ret = NULL;
1964 DT_RETURN_MARK(NewString, jstring, (const jstring&)ret);
1965 oop string=java_lang_String::create_oop_from_unicode((jchar*) unicodeChars, len, CHECK_NULL);
1966 ret = (jstring) JNIHandles::make_local(env, string);
1967 return ret;
1968 JNI_END
1971 JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string))
1972 JNIWrapper("GetStringLength");
1973 DTRACE_PROBE2(hotspot_jni, GetStringLength__entry, env, string);
1974 jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string));
1975 DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret);
1976 return ret;
1977 JNI_END
1980 JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars(
1981 JNIEnv *env, jstring string, jboolean *isCopy))
1982 JNIWrapper("GetStringChars");
1983 DTRACE_PROBE3(hotspot_jni, GetStringChars__entry, env, string, isCopy);
1984 //%note jni_5
1985 if (isCopy != NULL) {
1986 *isCopy = JNI_TRUE;
1987 }
1988 oop s = JNIHandles::resolve_non_null(string);
1989 int s_len = java_lang_String::length(s);
1990 typeArrayOop s_value = java_lang_String::value(s);
1991 int s_offset = java_lang_String::offset(s);
1992 jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1); // add one for zero termination
1993 if (s_len > 0) {
1994 memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len);
1995 }
1996 buf[s_len] = 0;
1997 DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf);
1998 return buf;
1999 JNI_END
2002 JNI_QUICK_ENTRY(void, jni_ReleaseStringChars(JNIEnv *env, jstring str, const jchar *chars))
2003 JNIWrapper("ReleaseStringChars");
2004 DTRACE_PROBE3(hotspot_jni, ReleaseStringChars__entry, env, str, chars);
2005 //%note jni_6
2006 if (chars != NULL) {
2007 // Since String objects are supposed to be immutable, don't copy any
2008 // new data back. A bad user will have to go after the char array.
2009 FreeHeap((void*) chars);
2010 }
2011 DTRACE_PROBE(hotspot_jni, ReleaseStringChars__return);
2012 JNI_END
2015 // UTF Interface
2017 DT_RETURN_MARK_DECL(NewStringUTF, jstring);
2019 JNI_ENTRY(jstring, jni_NewStringUTF(JNIEnv *env, const char *bytes))
2020 JNIWrapper("NewStringUTF");
2021 DTRACE_PROBE2(hotspot_jni, NewStringUTF__entry, env, bytes);
2022 jstring ret;
2023 DT_RETURN_MARK(NewStringUTF, jstring, (const jstring&)ret);
2025 oop result = java_lang_String::create_oop_from_str((char*) bytes, CHECK_NULL);
2026 ret = (jstring) JNIHandles::make_local(env, result);
2027 return ret;
2028 JNI_END
2031 JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string))
2032 JNIWrapper("GetStringUTFLength");
2033 DTRACE_PROBE2(hotspot_jni, GetStringUTFLength__entry, env, string);
2034 jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string));
2035 DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret);
2036 return ret;
2037 JNI_END
2040 JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboolean *isCopy))
2041 JNIWrapper("GetStringUTFChars");
2042 DTRACE_PROBE3(hotspot_jni, GetStringUTFChars__entry, env, string, isCopy);
2043 ResourceMark rm;
2044 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(string));
2045 int length = (int)strlen(str);
2046 char* result = AllocateHeap(length+1, "GetStringUTFChars");
2047 strcpy(result, str);
2048 if (isCopy != NULL) *isCopy = JNI_TRUE;
2049 DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result);
2050 return result;
2051 JNI_END
2054 JNI_LEAF(void, jni_ReleaseStringUTFChars(JNIEnv *env, jstring str, const char *chars))
2055 JNIWrapper("ReleaseStringUTFChars");
2056 DTRACE_PROBE3(hotspot_jni, ReleaseStringUTFChars__entry, env, str, chars);
2057 if (chars != NULL) {
2058 FreeHeap((char*) chars);
2059 }
2060 DTRACE_PROBE(hotspot_jni, ReleaseStringUTFChars__return);
2061 JNI_END
2064 JNI_QUICK_ENTRY(jsize, jni_GetArrayLength(JNIEnv *env, jarray array))
2065 JNIWrapper("GetArrayLength");
2066 DTRACE_PROBE2(hotspot_jni, GetArrayLength__entry, env, array);
2067 arrayOop a = arrayOop(JNIHandles::resolve_non_null(array));
2068 assert(a->is_array(), "must be array");
2069 jsize ret = a->length();
2070 DTRACE_PROBE1(hotspot_jni, GetArrayLength__return, ret);
2071 return ret;
2072 JNI_END
2075 //
2076 // Object Array Operations
2077 //
2079 DT_RETURN_MARK_DECL(NewObjectArray, jobjectArray);
2081 JNI_ENTRY(jobjectArray, jni_NewObjectArray(JNIEnv *env, jsize length, jclass elementClass, jobject initialElement))
2082 JNIWrapper("NewObjectArray");
2083 DTRACE_PROBE4(hotspot_jni, NewObjectArray__entry, env, length, elementClass, initialElement);
2084 jobjectArray ret = NULL;
2085 DT_RETURN_MARK(NewObjectArray, jobjectArray, (const jobjectArray&)ret);
2086 KlassHandle ek(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(elementClass)));
2087 klassOop ako = Klass::cast(ek())->array_klass(CHECK_NULL);
2088 KlassHandle ak = KlassHandle(THREAD, ako);
2089 objArrayKlass::cast(ak())->initialize(CHECK_NULL);
2090 objArrayOop result = objArrayKlass::cast(ak())->allocate(length, CHECK_NULL);
2091 oop initial_value = JNIHandles::resolve(initialElement);
2092 if (initial_value != NULL) { // array already initialized with NULL
2093 for (int index = 0; index < length; index++) {
2094 result->obj_at_put(index, initial_value);
2095 }
2096 }
2097 ret = (jobjectArray) JNIHandles::make_local(env, result);
2098 return ret;
2099 JNI_END
2101 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject);
2103 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2104 JNIWrapper("GetObjectArrayElement");
2105 DTRACE_PROBE3(hotspot_jni, GetObjectArrayElement__entry, env, array, index);
2106 jobject ret = NULL;
2107 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2108 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2109 if (a->is_within_bounds(index)) {
2110 jobject ret = JNIHandles::make_local(env, a->obj_at(index));
2111 return ret;
2112 } else {
2113 char buf[jintAsStringSize];
2114 sprintf(buf, "%d", index);
2115 THROW_MSG_0(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2116 }
2117 JNI_END
2119 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement);
2121 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2122 JNIWrapper("SetObjectArrayElement");
2123 DTRACE_PROBE4(hotspot_jni, SetObjectArrayElement__entry, env, array, index, value);
2124 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2126 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2127 oop v = JNIHandles::resolve(value);
2128 if (a->is_within_bounds(index)) {
2129 if (v == NULL || v->is_a(objArrayKlass::cast(a->klass())->element_klass())) {
2130 a->obj_at_put(index, v);
2131 } else {
2132 THROW(vmSymbols::java_lang_ArrayStoreException());
2133 }
2134 } else {
2135 char buf[jintAsStringSize];
2136 sprintf(buf, "%d", index);
2137 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2138 }
2139 JNI_END
2142 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result) \
2143 \
2144 DT_RETURN_MARK_DECL_FOR(Result, New##Result##Array, Return);\
2145 \
2146 JNI_ENTRY(Return, \
2147 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2148 JNIWrapper("New" XSTR(Result) "Array"); \
2149 DTRACE_PROBE2(hotspot_jni, New##Result##Array__entry, env, len);\
2150 Return ret = NULL;\
2151 DT_RETURN_MARK_FOR(Result, New##Result##Array, Return, (const Return&)ret);\
2152 \
2153 oop obj= oopFactory::Allocator(len, CHECK_0); \
2154 ret = (Return) JNIHandles::make_local(env, obj); \
2155 return ret;\
2156 JNI_END
2158 DEFINE_NEWSCALARARRAY(jbooleanArray, new_boolArray, Boolean)
2159 DEFINE_NEWSCALARARRAY(jbyteArray, new_byteArray, Byte)
2160 DEFINE_NEWSCALARARRAY(jshortArray, new_shortArray, Short)
2161 DEFINE_NEWSCALARARRAY(jcharArray, new_charArray, Char)
2162 DEFINE_NEWSCALARARRAY(jintArray, new_intArray, Int)
2163 DEFINE_NEWSCALARARRAY(jlongArray, new_longArray, Long)
2164 DEFINE_NEWSCALARARRAY(jfloatArray, new_singleArray, Float)
2165 DEFINE_NEWSCALARARRAY(jdoubleArray, new_doubleArray, Double)
2168 // Return an address which will fault if the caller writes to it.
2170 static char* get_bad_address() {
2171 static char* bad_address = NULL;
2172 if (bad_address == NULL) {
2173 size_t size = os::vm_allocation_granularity();
2174 bad_address = os::reserve_memory(size);
2175 if (bad_address != NULL) {
2176 os::protect_memory(bad_address, size, os::MEM_PROT_READ,
2177 /*is_committed*/false);
2178 }
2179 }
2180 return bad_address;
2181 }
2184 #define DEFINE_GETSCALARARRAYELEMENTS(ElementTag,ElementType,Result, Tag) \
2185 \
2186 JNI_QUICK_ENTRY(ElementType*, \
2187 jni_Get##Result##ArrayElements(JNIEnv *env, ElementType##Array array, jboolean *isCopy)) \
2188 JNIWrapper("Get" XSTR(Result) "ArrayElements"); \
2189 DTRACE_PROBE3(hotspot_jni, Get##Result##ArrayElements__entry, env, array, isCopy);\
2190 /* allocate an chunk of memory in c land */ \
2191 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2192 ElementType* result; \
2193 int len = a->length(); \
2194 if (len == 0) { \
2195 /* Empty array: legal but useless, can't return NULL. \
2196 * Return a pointer to something useless. \
2197 * Avoid asserts in typeArrayOop. */ \
2198 result = (ElementType*)get_bad_address(); \
2199 } else { \
2200 result = NEW_C_HEAP_ARRAY(ElementType, len); \
2201 /* copy the array to the c chunk */ \
2202 memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \
2203 } \
2204 if (isCopy) *isCopy = JNI_TRUE; \
2205 DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\
2206 return result; \
2207 JNI_END
2209 DEFINE_GETSCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2210 DEFINE_GETSCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2211 DEFINE_GETSCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2212 DEFINE_GETSCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2213 DEFINE_GETSCALARARRAYELEMENTS(T_INT, jint, Int, int)
2214 DEFINE_GETSCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2215 DEFINE_GETSCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2216 DEFINE_GETSCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2219 #define DEFINE_RELEASESCALARARRAYELEMENTS(ElementTag,ElementType,Result,Tag) \
2220 \
2221 JNI_QUICK_ENTRY(void, \
2222 jni_Release##Result##ArrayElements(JNIEnv *env, ElementType##Array array, \
2223 ElementType *buf, jint mode)) \
2224 JNIWrapper("Release" XSTR(Result) "ArrayElements"); \
2225 DTRACE_PROBE4(hotspot_jni, Release##Result##ArrayElements__entry, env, array, buf, mode);\
2226 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2227 int len = a->length(); \
2228 if (len != 0) { /* Empty array: nothing to free or copy. */ \
2229 if ((mode == 0) || (mode == JNI_COMMIT)) { \
2230 memcpy(a->Tag##_at_addr(0), buf, sizeof(ElementType)*len); \
2231 } \
2232 if ((mode == 0) || (mode == JNI_ABORT)) { \
2233 FreeHeap(buf); \
2234 } \
2235 } \
2236 DTRACE_PROBE(hotspot_jni, Release##Result##ArrayElements__return);\
2237 JNI_END
2239 DEFINE_RELEASESCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2240 DEFINE_RELEASESCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2241 DEFINE_RELEASESCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2242 DEFINE_RELEASESCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2243 DEFINE_RELEASESCALARARRAYELEMENTS(T_INT, jint, Int, int)
2244 DEFINE_RELEASESCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2245 DEFINE_RELEASESCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2246 DEFINE_RELEASESCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2248 #define DEFINE_GETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2249 DT_VOID_RETURN_MARK_DECL(Get##Result##ArrayRegion);\
2250 \
2251 JNI_ENTRY(void, \
2252 jni_Get##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2253 jsize len, ElementType *buf)) \
2254 JNIWrapper("Get" XSTR(Result) "ArrayRegion"); \
2255 DTRACE_PROBE5(hotspot_jni, Get##Result##ArrayRegion__entry, env, array, start, len, buf);\
2256 DT_VOID_RETURN_MARK(Get##Result##ArrayRegion); \
2257 typeArrayOop src = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2258 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)src->length())) { \
2259 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2260 } else { \
2261 if (len > 0) { \
2262 int sc = typeArrayKlass::cast(src->klass())->log2_element_size(); \
2263 memcpy((u_char*) buf, \
2264 (u_char*) src->Tag##_at_addr(start), \
2265 len << sc); \
2266 } \
2267 } \
2268 JNI_END
2270 DEFINE_GETSCALARARRAYREGION(T_BOOLEAN, jboolean,Boolean, bool)
2271 DEFINE_GETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2272 DEFINE_GETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2273 DEFINE_GETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2274 DEFINE_GETSCALARARRAYREGION(T_INT, jint, Int, int)
2275 DEFINE_GETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2276 DEFINE_GETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2277 DEFINE_GETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2279 #define DEFINE_SETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2280 DT_VOID_RETURN_MARK_DECL(Set##Result##ArrayRegion);\
2281 \
2282 JNI_ENTRY(void, \
2283 jni_Set##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2284 jsize len, const ElementType *buf)) \
2285 JNIWrapper("Set" XSTR(Result) "ArrayRegion"); \
2286 DTRACE_PROBE5(hotspot_jni, Set##Result##ArrayRegion__entry, env, array, start, len, buf);\
2287 DT_VOID_RETURN_MARK(Set##Result##ArrayRegion); \
2288 typeArrayOop dst = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2289 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)dst->length())) { \
2290 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2291 } else { \
2292 if (len > 0) { \
2293 int sc = typeArrayKlass::cast(dst->klass())->log2_element_size(); \
2294 memcpy((u_char*) dst->Tag##_at_addr(start), \
2295 (u_char*) buf, \
2296 len << sc); \
2297 } \
2298 } \
2299 JNI_END
2301 DEFINE_SETSCALARARRAYREGION(T_BOOLEAN, jboolean, Boolean, bool)
2302 DEFINE_SETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2303 DEFINE_SETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2304 DEFINE_SETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2305 DEFINE_SETSCALARARRAYREGION(T_INT, jint, Int, int)
2306 DEFINE_SETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2307 DEFINE_SETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2308 DEFINE_SETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2311 //
2312 // Interception of natives
2313 //
2315 // The RegisterNatives call being attempted tried to register with a method that
2316 // is not native. Ask JVM TI what prefixes have been specified. Then check
2317 // to see if the native method is now wrapped with the prefixes. See the
2318 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
2319 static methodOop find_prefixed_native(KlassHandle k,
2320 symbolHandle name, symbolHandle signature, TRAPS) {
2321 ResourceMark rm(THREAD);
2322 methodOop method;
2323 int name_len = name->utf8_length();
2324 char* name_str = name->as_utf8();
2325 int prefix_count;
2326 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
2327 for (int i = 0; i < prefix_count; i++) {
2328 char* prefix = prefixes[i];
2329 int prefix_len = (int)strlen(prefix);
2331 // try adding this prefix to the method name and see if it matches another method name
2332 int trial_len = name_len + prefix_len;
2333 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
2334 strcpy(trial_name_str, prefix);
2335 strcat(trial_name_str, name_str);
2336 symbolHandle trial_name(THREAD, SymbolTable::probe(trial_name_str, trial_len));
2337 if (trial_name.is_null()) {
2338 continue; // no such symbol, so this prefix wasn't used, try the next prefix
2339 }
2340 method = Klass::cast(k())->lookup_method(trial_name(), signature());
2341 if (method == NULL) {
2342 continue; // signature doesn't match, try the next prefix
2343 }
2344 if (method->is_native()) {
2345 method->set_is_prefixed_native();
2346 return method; // wahoo, we found a prefixed version of the method, return it
2347 }
2348 // found as non-native, so prefix is good, add it, probably just need more prefixes
2349 name_len = trial_len;
2350 name_str = trial_name_str;
2351 }
2352 return NULL; // not found
2353 }
2355 static bool register_native(KlassHandle k, symbolHandle name, symbolHandle signature, address entry, TRAPS) {
2356 methodOop method = Klass::cast(k())->lookup_method(name(), signature());
2357 if (method == NULL) {
2358 ResourceMark rm;
2359 stringStream st;
2360 st.print("Method %s name or signature does not match",
2361 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
2362 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2363 }
2364 if (!method->is_native()) {
2365 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
2366 method = find_prefixed_native(k, name, signature, THREAD);
2367 if (method == NULL) {
2368 ResourceMark rm;
2369 stringStream st;
2370 st.print("Method %s is not declared as native",
2371 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
2372 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2373 }
2374 }
2376 if (entry != NULL) {
2377 method->set_native_function(entry,
2378 methodOopDesc::native_bind_event_is_interesting);
2379 } else {
2380 method->clear_native_function();
2381 }
2382 if (PrintJNIResolving) {
2383 ResourceMark rm(THREAD);
2384 tty->print_cr("[Registering JNI native method %s.%s]",
2385 Klass::cast(method->method_holder())->external_name(),
2386 method->name()->as_C_string());
2387 }
2388 return true;
2389 }
2391 DT_RETURN_MARK_DECL(RegisterNatives, jint);
2393 JNI_ENTRY(jint, jni_RegisterNatives(JNIEnv *env, jclass clazz,
2394 const JNINativeMethod *methods,
2395 jint nMethods))
2396 JNIWrapper("RegisterNatives");
2397 DTRACE_PROBE4(hotspot_jni, RegisterNatives__entry, env, clazz, methods, nMethods);
2398 jint ret = 0;
2399 DT_RETURN_MARK(RegisterNatives, jint, (const jint&)ret);
2401 KlassHandle h_k(thread, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
2403 for (int index = 0; index < nMethods; index++) {
2404 const char* meth_name = methods[index].name;
2405 const char* meth_sig = methods[index].signature;
2406 int meth_name_len = (int)strlen(meth_name);
2408 // The class should have been loaded (we have an instance of the class
2409 // passed in) so the method and signature should already be in the symbol
2410 // table. If they're not there, the method doesn't exist.
2411 symbolHandle name(THREAD, SymbolTable::probe(meth_name, meth_name_len));
2412 symbolHandle signature(THREAD, SymbolTable::probe(meth_sig, (int)strlen(meth_sig)));
2414 if (name.is_null() || signature.is_null()) {
2415 ResourceMark rm;
2416 stringStream st;
2417 st.print("Method %s.%s%s not found", Klass::cast(h_k())->external_name(), meth_name, meth_sig);
2418 // Must return negative value on failure
2419 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), -1);
2420 }
2422 bool res = register_native(h_k, name, signature,
2423 (address) methods[index].fnPtr, THREAD);
2424 if (!res) {
2425 ret = -1;
2426 break;
2427 }
2428 }
2429 return ret;
2430 JNI_END
2433 JNI_ENTRY(jint, jni_UnregisterNatives(JNIEnv *env, jclass clazz))
2434 JNIWrapper("UnregisterNatives");
2435 DTRACE_PROBE2(hotspot_jni, UnregisterNatives__entry, env, clazz);
2436 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz));
2437 //%note jni_2
2438 if (Klass::cast(k)->oop_is_instance()) {
2439 for (int index = 0; index < instanceKlass::cast(k)->methods()->length(); index++) {
2440 methodOop m = methodOop(instanceKlass::cast(k)->methods()->obj_at(index));
2441 if (m->is_native()) {
2442 m->clear_native_function();
2443 m->set_signature_handler(NULL);
2444 }
2445 }
2446 }
2447 DTRACE_PROBE1(hotspot_jni, UnregisterNatives__return, 0);
2448 return 0;
2449 JNI_END
2451 //
2452 // Monitor functions
2453 //
2455 DT_RETURN_MARK_DECL(MonitorEnter, jint);
2457 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2458 DTRACE_PROBE2(hotspot_jni, MonitorEnter__entry, env, jobj);
2459 jint ret = JNI_ERR;
2460 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2462 // If the object is null, we can't do anything with it
2463 if (jobj == NULL) {
2464 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2465 }
2467 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2468 ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR));
2469 ret = JNI_OK;
2470 return ret;
2471 JNI_END
2473 DT_RETURN_MARK_DECL(MonitorExit, jint);
2475 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2476 DTRACE_PROBE2(hotspot_jni, MonitorExit__entry, env, jobj);
2477 jint ret = JNI_ERR;
2478 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2480 // Don't do anything with a null object
2481 if (jobj == NULL) {
2482 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2483 }
2485 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2486 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2488 ret = JNI_OK;
2489 return ret;
2490 JNI_END
2492 //
2493 // Extensions
2494 //
2496 DT_VOID_RETURN_MARK_DECL(GetStringRegion);
2498 JNI_ENTRY(void, jni_GetStringRegion(JNIEnv *env, jstring string, jsize start, jsize len, jchar *buf))
2499 JNIWrapper("GetStringRegion");
2500 DTRACE_PROBE5(hotspot_jni, GetStringRegion__entry, env, string, start, len, buf);
2501 DT_VOID_RETURN_MARK(GetStringRegion);
2502 oop s = JNIHandles::resolve_non_null(string);
2503 int s_len = java_lang_String::length(s);
2504 if (start < 0 || len < 0 || start + len > s_len) {
2505 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2506 } else {
2507 if (len > 0) {
2508 int s_offset = java_lang_String::offset(s);
2509 typeArrayOop s_value = java_lang_String::value(s);
2510 memcpy(buf, s_value->char_at_addr(s_offset+start), sizeof(jchar)*len);
2511 }
2512 }
2513 JNI_END
2515 DT_VOID_RETURN_MARK_DECL(GetStringUTFRegion);
2517 JNI_ENTRY(void, jni_GetStringUTFRegion(JNIEnv *env, jstring string, jsize start, jsize len, char *buf))
2518 JNIWrapper("GetStringUTFRegion");
2519 DTRACE_PROBE5(hotspot_jni, GetStringUTFRegion__entry, env, string, start, len, buf);
2520 DT_VOID_RETURN_MARK(GetStringUTFRegion);
2521 oop s = JNIHandles::resolve_non_null(string);
2522 int s_len = java_lang_String::length(s);
2523 if (start < 0 || len < 0 || start + len > s_len) {
2524 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2525 } else {
2526 //%note jni_7
2527 if (len > 0) {
2528 ResourceMark rm(THREAD);
2529 char *utf_region = java_lang_String::as_utf8_string(s, start, len);
2530 int utf_len = (int)strlen(utf_region);
2531 memcpy(buf, utf_region, utf_len);
2532 buf[utf_len] = 0;
2533 } else {
2534 // JDK null-terminates the buffer even in len is zero
2535 if (buf != NULL) {
2536 buf[0] = 0;
2537 }
2538 }
2539 }
2540 JNI_END
2543 JNI_ENTRY(void*, jni_GetPrimitiveArrayCritical(JNIEnv *env, jarray array, jboolean *isCopy))
2544 JNIWrapper("GetPrimitiveArrayCritical");
2545 DTRACE_PROBE3(hotspot_jni, GetPrimitiveArrayCritical__entry, env, array, isCopy);
2546 GC_locker::lock_critical(thread);
2547 if (isCopy != NULL) {
2548 *isCopy = JNI_FALSE;
2549 }
2550 oop a = JNIHandles::resolve_non_null(array);
2551 assert(a->is_array(), "just checking");
2552 BasicType type;
2553 if (a->is_objArray()) {
2554 type = T_OBJECT;
2555 } else {
2556 type = typeArrayKlass::cast(a->klass())->element_type();
2557 }
2558 void* ret = arrayOop(a)->base(type);
2559 DTRACE_PROBE1(hotspot_jni, GetPrimitiveArrayCritical__return, ret);
2560 return ret;
2561 JNI_END
2564 JNI_ENTRY(void, jni_ReleasePrimitiveArrayCritical(JNIEnv *env, jarray array, void *carray, jint mode))
2565 JNIWrapper("ReleasePrimitiveArrayCritical");
2566 DTRACE_PROBE4(hotspot_jni, ReleasePrimitiveArrayCritical__entry, env, array, carray, mode);
2567 // The array, carray and mode arguments are ignored
2568 GC_locker::unlock_critical(thread);
2569 DTRACE_PROBE(hotspot_jni, ReleasePrimitiveArrayCritical__return);
2570 JNI_END
2573 JNI_ENTRY(const jchar*, jni_GetStringCritical(JNIEnv *env, jstring string, jboolean *isCopy))
2574 JNIWrapper("GetStringCritical");
2575 DTRACE_PROBE3(hotspot_jni, GetStringCritical__entry, env, string, isCopy);
2576 GC_locker::lock_critical(thread);
2577 if (isCopy != NULL) {
2578 *isCopy = JNI_FALSE;
2579 }
2580 oop s = JNIHandles::resolve_non_null(string);
2581 int s_len = java_lang_String::length(s);
2582 typeArrayOop s_value = java_lang_String::value(s);
2583 int s_offset = java_lang_String::offset(s);
2584 const jchar* ret;
2585 if (s_len > 0) {
2586 ret = s_value->char_at_addr(s_offset);
2587 } else {
2588 ret = (jchar*) s_value->base(T_CHAR);
2589 }
2590 DTRACE_PROBE1(hotspot_jni, GetStringCritical__return, ret);
2591 return ret;
2592 JNI_END
2595 JNI_ENTRY(void, jni_ReleaseStringCritical(JNIEnv *env, jstring str, const jchar *chars))
2596 JNIWrapper("ReleaseStringCritical");
2597 DTRACE_PROBE3(hotspot_jni, ReleaseStringCritical__entry, env, str, chars);
2598 // The str and chars arguments are ignored
2599 GC_locker::unlock_critical(thread);
2600 DTRACE_PROBE(hotspot_jni, ReleaseStringCritical__return);
2601 JNI_END
2604 JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref))
2605 JNIWrapper("jni_NewWeakGlobalRef");
2606 DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref);
2607 Handle ref_handle(thread, JNIHandles::resolve(ref));
2608 jweak ret = JNIHandles::make_weak_global(ref_handle);
2609 DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret);
2610 return ret;
2611 JNI_END
2613 // Must be JNI_ENTRY (with HandleMark)
2614 JNI_ENTRY(void, jni_DeleteWeakGlobalRef(JNIEnv *env, jweak ref))
2615 JNIWrapper("jni_DeleteWeakGlobalRef");
2616 DTRACE_PROBE2(hotspot_jni, DeleteWeakGlobalRef__entry, env, ref);
2617 JNIHandles::destroy_weak_global(ref);
2618 DTRACE_PROBE(hotspot_jni, DeleteWeakGlobalRef__return);
2619 JNI_END
2622 JNI_QUICK_ENTRY(jboolean, jni_ExceptionCheck(JNIEnv *env))
2623 JNIWrapper("jni_ExceptionCheck");
2624 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__entry, env);
2625 jni_check_async_exceptions(thread);
2626 jboolean ret = (thread->has_pending_exception()) ? JNI_TRUE : JNI_FALSE;
2627 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__return, ret);
2628 return ret;
2629 JNI_END
2632 // Initialization state for three routines below relating to
2633 // java.nio.DirectBuffers
2634 static jint directBufferSupportInitializeStarted = 0;
2635 static volatile jint directBufferSupportInitializeEnded = 0;
2636 static volatile jint directBufferSupportInitializeFailed = 0;
2637 static jclass bufferClass = NULL;
2638 static jclass directBufferClass = NULL;
2639 static jclass directByteBufferClass = NULL;
2640 static jmethodID directByteBufferConstructor = NULL;
2641 static jfieldID directBufferAddressField = NULL;
2642 static jfieldID bufferCapacityField = NULL;
2644 static jclass lookupOne(JNIEnv* env, const char* name, TRAPS) {
2645 Handle loader; // null (bootstrap) loader
2646 Handle protection_domain; // null protection domain
2648 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
2649 return find_class_from_class_loader(env, sym, true, loader, protection_domain, true, CHECK_NULL);
2650 }
2652 // These lookups are done with the NULL (bootstrap) ClassLoader to
2653 // circumvent any security checks that would be done by jni_FindClass.
2654 JNI_ENTRY(bool, lookupDirectBufferClasses(JNIEnv* env))
2655 {
2656 if ((bufferClass = lookupOne(env, "java/nio/Buffer", thread)) == NULL) { return false; }
2657 if ((directBufferClass = lookupOne(env, "sun/nio/ch/DirectBuffer", thread)) == NULL) { return false; }
2658 if ((directByteBufferClass = lookupOne(env, "java/nio/DirectByteBuffer", thread)) == NULL) { return false; }
2659 return true;
2660 }
2661 JNI_END
2664 static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) {
2665 if (directBufferSupportInitializeFailed) {
2666 return false;
2667 }
2669 if (Atomic::cmpxchg(1, &directBufferSupportInitializeStarted, 0) == 0) {
2670 if (!lookupDirectBufferClasses(env)) {
2671 directBufferSupportInitializeFailed = 1;
2672 return false;
2673 }
2675 // Make global references for these
2676 bufferClass = (jclass) env->NewGlobalRef(bufferClass);
2677 directBufferClass = (jclass) env->NewGlobalRef(directBufferClass);
2678 directByteBufferClass = (jclass) env->NewGlobalRef(directByteBufferClass);
2680 // Get needed field and method IDs
2681 directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V");
2682 directBufferAddressField = env->GetFieldID(bufferClass, "address", "J");
2683 bufferCapacityField = env->GetFieldID(bufferClass, "capacity", "I");
2685 if ((directByteBufferConstructor == NULL) ||
2686 (directBufferAddressField == NULL) ||
2687 (bufferCapacityField == NULL)) {
2688 directBufferSupportInitializeFailed = 1;
2689 return false;
2690 }
2692 directBufferSupportInitializeEnded = 1;
2693 } else {
2694 while (!directBufferSupportInitializeEnded && !directBufferSupportInitializeFailed) {
2695 // Set state as yield_all can call os:sleep. On Solaris, yield_all calls
2696 // os::sleep which requires the VM state transition. On other platforms, it
2697 // is not necessary. The following call to change the VM state is purposely
2698 // put inside the loop to avoid potential deadlock when multiple threads
2699 // try to call this method. See 6791815 for more details.
2700 ThreadInVMfromNative tivn(thread);
2701 os::yield_all();
2702 }
2703 }
2705 return !directBufferSupportInitializeFailed;
2706 }
2708 extern "C" jobject JNICALL jni_NewDirectByteBuffer(JNIEnv *env, void* address, jlong capacity)
2709 {
2710 // thread_from_jni_environment() will block if VM is gone.
2711 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2713 JNIWrapper("jni_NewDirectByteBuffer");
2714 DTRACE_PROBE3(hotspot_jni, NewDirectByteBuffer__entry, env, address, capacity);
2716 if (!directBufferSupportInitializeEnded) {
2717 if (!initializeDirectBufferSupport(env, thread)) {
2718 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, NULL);
2719 return NULL;
2720 }
2721 }
2723 // Being paranoid about accidental sign extension on address
2724 jlong addr = (jlong) ((uintptr_t) address);
2725 // NOTE that package-private DirectByteBuffer constructor currently
2726 // takes int capacity
2727 jint cap = (jint) capacity;
2728 jobject ret = env->NewObject(directByteBufferClass, directByteBufferConstructor, addr, cap);
2729 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, ret);
2730 return ret;
2731 }
2733 DT_RETURN_MARK_DECL(GetDirectBufferAddress, void*);
2735 extern "C" void* JNICALL jni_GetDirectBufferAddress(JNIEnv *env, jobject buf)
2736 {
2737 // thread_from_jni_environment() will block if VM is gone.
2738 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2740 JNIWrapper("jni_GetDirectBufferAddress");
2741 DTRACE_PROBE2(hotspot_jni, GetDirectBufferAddress__entry, env, buf);
2742 void* ret = NULL;
2743 DT_RETURN_MARK(GetDirectBufferAddress, void*, (const void*&)ret);
2745 if (!directBufferSupportInitializeEnded) {
2746 if (!initializeDirectBufferSupport(env, thread)) {
2747 return 0;
2748 }
2749 }
2751 if ((buf != NULL) && (!env->IsInstanceOf(buf, directBufferClass))) {
2752 return 0;
2753 }
2755 ret = (void*)(intptr_t)env->GetLongField(buf, directBufferAddressField);
2756 return ret;
2757 }
2759 DT_RETURN_MARK_DECL(GetDirectBufferCapacity, jlong);
2761 extern "C" jlong JNICALL jni_GetDirectBufferCapacity(JNIEnv *env, jobject buf)
2762 {
2763 // thread_from_jni_environment() will block if VM is gone.
2764 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2766 JNIWrapper("jni_GetDirectBufferCapacity");
2767 DTRACE_PROBE2(hotspot_jni, GetDirectBufferCapacity__entry, env, buf);
2768 jlong ret = -1;
2769 DT_RETURN_MARK(GetDirectBufferCapacity, jlong, (const jlong&)ret);
2771 if (!directBufferSupportInitializeEnded) {
2772 if (!initializeDirectBufferSupport(env, thread)) {
2773 ret = 0;
2774 return ret;
2775 }
2776 }
2778 if (buf == NULL) {
2779 return -1;
2780 }
2782 if (!env->IsInstanceOf(buf, directBufferClass)) {
2783 return -1;
2784 }
2786 // NOTE that capacity is currently an int in the implementation
2787 ret = env->GetIntField(buf, bufferCapacityField);
2788 return ret;
2789 }
2792 JNI_LEAF(jint, jni_GetVersion(JNIEnv *env))
2793 JNIWrapper("GetVersion");
2794 DTRACE_PROBE1(hotspot_jni, GetVersion__entry, env);
2795 DTRACE_PROBE1(hotspot_jni, GetVersion__return, CurrentVersion);
2796 return CurrentVersion;
2797 JNI_END
2799 extern struct JavaVM_ main_vm;
2801 JNI_LEAF(jint, jni_GetJavaVM(JNIEnv *env, JavaVM **vm))
2802 JNIWrapper("jni_GetJavaVM");
2803 DTRACE_PROBE2(hotspot_jni, GetJavaVM__entry, env, vm);
2804 *vm = (JavaVM *)(&main_vm);
2805 DTRACE_PROBE1(hotspot_jni, GetJavaVM__return, JNI_OK);
2806 return JNI_OK;
2807 JNI_END
2809 // Structure containing all jni functions
2810 struct JNINativeInterface_ jni_NativeInterface = {
2811 NULL,
2812 NULL,
2813 NULL,
2815 NULL,
2817 jni_GetVersion,
2819 jni_DefineClass,
2820 jni_FindClass,
2822 jni_FromReflectedMethod,
2823 jni_FromReflectedField,
2825 jni_ToReflectedMethod,
2827 jni_GetSuperclass,
2828 jni_IsAssignableFrom,
2830 jni_ToReflectedField,
2832 jni_Throw,
2833 jni_ThrowNew,
2834 jni_ExceptionOccurred,
2835 jni_ExceptionDescribe,
2836 jni_ExceptionClear,
2837 jni_FatalError,
2839 jni_PushLocalFrame,
2840 jni_PopLocalFrame,
2842 jni_NewGlobalRef,
2843 jni_DeleteGlobalRef,
2844 jni_DeleteLocalRef,
2845 jni_IsSameObject,
2847 jni_NewLocalRef,
2848 jni_EnsureLocalCapacity,
2850 jni_AllocObject,
2851 jni_NewObject,
2852 jni_NewObjectV,
2853 jni_NewObjectA,
2855 jni_GetObjectClass,
2856 jni_IsInstanceOf,
2858 jni_GetMethodID,
2860 jni_CallObjectMethod,
2861 jni_CallObjectMethodV,
2862 jni_CallObjectMethodA,
2863 jni_CallBooleanMethod,
2864 jni_CallBooleanMethodV,
2865 jni_CallBooleanMethodA,
2866 jni_CallByteMethod,
2867 jni_CallByteMethodV,
2868 jni_CallByteMethodA,
2869 jni_CallCharMethod,
2870 jni_CallCharMethodV,
2871 jni_CallCharMethodA,
2872 jni_CallShortMethod,
2873 jni_CallShortMethodV,
2874 jni_CallShortMethodA,
2875 jni_CallIntMethod,
2876 jni_CallIntMethodV,
2877 jni_CallIntMethodA,
2878 jni_CallLongMethod,
2879 jni_CallLongMethodV,
2880 jni_CallLongMethodA,
2881 jni_CallFloatMethod,
2882 jni_CallFloatMethodV,
2883 jni_CallFloatMethodA,
2884 jni_CallDoubleMethod,
2885 jni_CallDoubleMethodV,
2886 jni_CallDoubleMethodA,
2887 jni_CallVoidMethod,
2888 jni_CallVoidMethodV,
2889 jni_CallVoidMethodA,
2891 jni_CallNonvirtualObjectMethod,
2892 jni_CallNonvirtualObjectMethodV,
2893 jni_CallNonvirtualObjectMethodA,
2894 jni_CallNonvirtualBooleanMethod,
2895 jni_CallNonvirtualBooleanMethodV,
2896 jni_CallNonvirtualBooleanMethodA,
2897 jni_CallNonvirtualByteMethod,
2898 jni_CallNonvirtualByteMethodV,
2899 jni_CallNonvirtualByteMethodA,
2900 jni_CallNonvirtualCharMethod,
2901 jni_CallNonvirtualCharMethodV,
2902 jni_CallNonvirtualCharMethodA,
2903 jni_CallNonvirtualShortMethod,
2904 jni_CallNonvirtualShortMethodV,
2905 jni_CallNonvirtualShortMethodA,
2906 jni_CallNonvirtualIntMethod,
2907 jni_CallNonvirtualIntMethodV,
2908 jni_CallNonvirtualIntMethodA,
2909 jni_CallNonvirtualLongMethod,
2910 jni_CallNonvirtualLongMethodV,
2911 jni_CallNonvirtualLongMethodA,
2912 jni_CallNonvirtualFloatMethod,
2913 jni_CallNonvirtualFloatMethodV,
2914 jni_CallNonvirtualFloatMethodA,
2915 jni_CallNonvirtualDoubleMethod,
2916 jni_CallNonvirtualDoubleMethodV,
2917 jni_CallNonvirtualDoubleMethodA,
2918 jni_CallNonvirtualVoidMethod,
2919 jni_CallNonvirtualVoidMethodV,
2920 jni_CallNonvirtualVoidMethodA,
2922 jni_GetFieldID,
2924 jni_GetObjectField,
2925 jni_GetBooleanField,
2926 jni_GetByteField,
2927 jni_GetCharField,
2928 jni_GetShortField,
2929 jni_GetIntField,
2930 jni_GetLongField,
2931 jni_GetFloatField,
2932 jni_GetDoubleField,
2934 jni_SetObjectField,
2935 jni_SetBooleanField,
2936 jni_SetByteField,
2937 jni_SetCharField,
2938 jni_SetShortField,
2939 jni_SetIntField,
2940 jni_SetLongField,
2941 jni_SetFloatField,
2942 jni_SetDoubleField,
2944 jni_GetStaticMethodID,
2946 jni_CallStaticObjectMethod,
2947 jni_CallStaticObjectMethodV,
2948 jni_CallStaticObjectMethodA,
2949 jni_CallStaticBooleanMethod,
2950 jni_CallStaticBooleanMethodV,
2951 jni_CallStaticBooleanMethodA,
2952 jni_CallStaticByteMethod,
2953 jni_CallStaticByteMethodV,
2954 jni_CallStaticByteMethodA,
2955 jni_CallStaticCharMethod,
2956 jni_CallStaticCharMethodV,
2957 jni_CallStaticCharMethodA,
2958 jni_CallStaticShortMethod,
2959 jni_CallStaticShortMethodV,
2960 jni_CallStaticShortMethodA,
2961 jni_CallStaticIntMethod,
2962 jni_CallStaticIntMethodV,
2963 jni_CallStaticIntMethodA,
2964 jni_CallStaticLongMethod,
2965 jni_CallStaticLongMethodV,
2966 jni_CallStaticLongMethodA,
2967 jni_CallStaticFloatMethod,
2968 jni_CallStaticFloatMethodV,
2969 jni_CallStaticFloatMethodA,
2970 jni_CallStaticDoubleMethod,
2971 jni_CallStaticDoubleMethodV,
2972 jni_CallStaticDoubleMethodA,
2973 jni_CallStaticVoidMethod,
2974 jni_CallStaticVoidMethodV,
2975 jni_CallStaticVoidMethodA,
2977 jni_GetStaticFieldID,
2979 jni_GetStaticObjectField,
2980 jni_GetStaticBooleanField,
2981 jni_GetStaticByteField,
2982 jni_GetStaticCharField,
2983 jni_GetStaticShortField,
2984 jni_GetStaticIntField,
2985 jni_GetStaticLongField,
2986 jni_GetStaticFloatField,
2987 jni_GetStaticDoubleField,
2989 jni_SetStaticObjectField,
2990 jni_SetStaticBooleanField,
2991 jni_SetStaticByteField,
2992 jni_SetStaticCharField,
2993 jni_SetStaticShortField,
2994 jni_SetStaticIntField,
2995 jni_SetStaticLongField,
2996 jni_SetStaticFloatField,
2997 jni_SetStaticDoubleField,
2999 jni_NewString,
3000 jni_GetStringLength,
3001 jni_GetStringChars,
3002 jni_ReleaseStringChars,
3004 jni_NewStringUTF,
3005 jni_GetStringUTFLength,
3006 jni_GetStringUTFChars,
3007 jni_ReleaseStringUTFChars,
3009 jni_GetArrayLength,
3011 jni_NewObjectArray,
3012 jni_GetObjectArrayElement,
3013 jni_SetObjectArrayElement,
3015 jni_NewBooleanArray,
3016 jni_NewByteArray,
3017 jni_NewCharArray,
3018 jni_NewShortArray,
3019 jni_NewIntArray,
3020 jni_NewLongArray,
3021 jni_NewFloatArray,
3022 jni_NewDoubleArray,
3024 jni_GetBooleanArrayElements,
3025 jni_GetByteArrayElements,
3026 jni_GetCharArrayElements,
3027 jni_GetShortArrayElements,
3028 jni_GetIntArrayElements,
3029 jni_GetLongArrayElements,
3030 jni_GetFloatArrayElements,
3031 jni_GetDoubleArrayElements,
3033 jni_ReleaseBooleanArrayElements,
3034 jni_ReleaseByteArrayElements,
3035 jni_ReleaseCharArrayElements,
3036 jni_ReleaseShortArrayElements,
3037 jni_ReleaseIntArrayElements,
3038 jni_ReleaseLongArrayElements,
3039 jni_ReleaseFloatArrayElements,
3040 jni_ReleaseDoubleArrayElements,
3042 jni_GetBooleanArrayRegion,
3043 jni_GetByteArrayRegion,
3044 jni_GetCharArrayRegion,
3045 jni_GetShortArrayRegion,
3046 jni_GetIntArrayRegion,
3047 jni_GetLongArrayRegion,
3048 jni_GetFloatArrayRegion,
3049 jni_GetDoubleArrayRegion,
3051 jni_SetBooleanArrayRegion,
3052 jni_SetByteArrayRegion,
3053 jni_SetCharArrayRegion,
3054 jni_SetShortArrayRegion,
3055 jni_SetIntArrayRegion,
3056 jni_SetLongArrayRegion,
3057 jni_SetFloatArrayRegion,
3058 jni_SetDoubleArrayRegion,
3060 jni_RegisterNatives,
3061 jni_UnregisterNatives,
3063 jni_MonitorEnter,
3064 jni_MonitorExit,
3066 jni_GetJavaVM,
3068 jni_GetStringRegion,
3069 jni_GetStringUTFRegion,
3071 jni_GetPrimitiveArrayCritical,
3072 jni_ReleasePrimitiveArrayCritical,
3074 jni_GetStringCritical,
3075 jni_ReleaseStringCritical,
3077 jni_NewWeakGlobalRef,
3078 jni_DeleteWeakGlobalRef,
3080 jni_ExceptionCheck,
3082 jni_NewDirectByteBuffer,
3083 jni_GetDirectBufferAddress,
3084 jni_GetDirectBufferCapacity,
3086 // New 1_6 features
3088 jni_GetObjectRefType
3089 };
3092 // For jvmti use to modify jni function table.
3093 // Java threads in native contiues to run until it is transitioned
3094 // to VM at safepoint. Before the transition or before it is blocked
3095 // for safepoint it may access jni function table. VM could crash if
3096 // any java thread access the jni function table in the middle of memcpy.
3097 // To avoid this each function pointers are copied automically.
3098 void copy_jni_function_table(const struct JNINativeInterface_ *new_jni_NativeInterface) {
3099 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
3100 intptr_t *a = (intptr_t *) jni_functions();
3101 intptr_t *b = (intptr_t *) new_jni_NativeInterface;
3102 for (uint i=0; i < sizeof(struct JNINativeInterface_)/sizeof(void *); i++) {
3103 Atomic::store_ptr(*b++, a++);
3104 }
3105 }
3107 void quicken_jni_functions() {
3108 // Replace Get<Primitive>Field with fast versions
3109 if (UseFastJNIAccessors && !JvmtiExport::can_post_field_access()
3110 && !VerifyJNIFields && !TraceJNICalls && !CountJNICalls && !CheckJNICalls
3111 #if defined(_WINDOWS) && defined(IA32) && defined(COMPILER2)
3112 // windows x86 currently needs SEH wrapper and the gain of the fast
3113 // versions currently isn't certain for server vm on uniprocessor.
3114 && os::is_MP()
3115 #endif
3116 ) {
3117 address func;
3118 func = JNI_FastGetField::generate_fast_get_boolean_field();
3119 if (func != (address)-1) {
3120 jni_NativeInterface.GetBooleanField = (GetBooleanField_t)func;
3121 }
3122 func = JNI_FastGetField::generate_fast_get_byte_field();
3123 if (func != (address)-1) {
3124 jni_NativeInterface.GetByteField = (GetByteField_t)func;
3125 }
3126 func = JNI_FastGetField::generate_fast_get_char_field();
3127 if (func != (address)-1) {
3128 jni_NativeInterface.GetCharField = (GetCharField_t)func;
3129 }
3130 func = JNI_FastGetField::generate_fast_get_short_field();
3131 if (func != (address)-1) {
3132 jni_NativeInterface.GetShortField = (GetShortField_t)func;
3133 }
3134 func = JNI_FastGetField::generate_fast_get_int_field();
3135 if (func != (address)-1) {
3136 jni_NativeInterface.GetIntField = (GetIntField_t)func;
3137 }
3138 func = JNI_FastGetField::generate_fast_get_long_field();
3139 if (func != (address)-1) {
3140 jni_NativeInterface.GetLongField = (GetLongField_t)func;
3141 }
3142 func = JNI_FastGetField::generate_fast_get_float_field();
3143 if (func != (address)-1) {
3144 jni_NativeInterface.GetFloatField = (GetFloatField_t)func;
3145 }
3146 func = JNI_FastGetField::generate_fast_get_double_field();
3147 if (func != (address)-1) {
3148 jni_NativeInterface.GetDoubleField = (GetDoubleField_t)func;
3149 }
3150 }
3151 }
3153 // Returns the function structure
3154 struct JNINativeInterface_* jni_functions() {
3155 #ifndef JNICHECK_KERNEL
3156 if (CheckJNICalls) return jni_functions_check();
3157 #else // JNICHECK_KERNEL
3158 if (CheckJNICalls) warning("-Xcheck:jni is not supported in kernel vm.");
3159 #endif // JNICHECK_KERNEL
3160 return &jni_NativeInterface;
3161 }
3163 // Returns the function structure
3164 struct JNINativeInterface_* jni_functions_nocheck() {
3165 return &jni_NativeInterface;
3166 }
3169 // Invocation API
3172 // Forward declaration
3173 extern const struct JNIInvokeInterface_ jni_InvokeInterface;
3175 // Global invocation API vars
3176 volatile jint vm_created = 0;
3177 // Indicate whether it is safe to recreate VM
3178 volatile jint safe_to_recreate_vm = 1;
3179 struct JavaVM_ main_vm = {&jni_InvokeInterface};
3182 #define JAVASTACKSIZE (400 * 1024) /* Default size of a thread java stack */
3183 #define PROCSTACKSIZE 0 /* 0 means default size in HPI */
3184 enum { VERIFY_NONE, VERIFY_REMOTE, VERIFY_ALL };
3186 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, void*);
3187 DT_RETURN_MARK_DECL(GetDefaultJavaVMInitArgs, jint);
3189 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args_) {
3190 HS_DTRACE_PROBE1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, args_);
3191 JDK1_1InitArgs *args = (JDK1_1InitArgs *)args_;
3192 jint ret = JNI_ERR;
3193 DT_RETURN_MARK(GetDefaultJavaVMInitArgs, jint, (const jint&)ret);
3195 if (Threads::is_supported_jni_version(args->version)) {
3196 ret = JNI_OK;
3197 }
3198 // 1.1 style no longer supported in hotspot.
3199 // According the JNI spec, we should update args->version on return.
3200 // We also use the structure to communicate with launcher about default
3201 // stack size.
3202 if (args->version == JNI_VERSION_1_1) {
3203 args->version = JNI_VERSION_1_2;
3204 // javaStackSize is int in arguments structure
3205 assert(jlong(ThreadStackSize) * K < INT_MAX, "integer overflow");
3206 args->javaStackSize = (jint)(ThreadStackSize * K);
3207 }
3208 return ret;
3209 }
3211 HS_DTRACE_PROBE_DECL3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3212 DT_RETURN_MARK_DECL(CreateJavaVM, jint);
3214 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) {
3215 HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3217 jint result = JNI_ERR;
3218 DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result);
3220 // At the moment it's only possible to have one Java VM,
3221 // since some of the runtime state is in global variables.
3223 // We cannot use our mutex locks here, since they only work on
3224 // Threads. We do an atomic compare and exchange to ensure only
3225 // one thread can call this method at a time
3227 // We use Atomic::xchg rather than Atomic::add/dec since on some platforms
3228 // the add/dec implementations are dependent on whether we are running
3229 // on a multiprocessor, and at this stage of initialization the os::is_MP
3230 // function used to determine this will always return false. Atomic::xchg
3231 // does not have this problem.
3232 if (Atomic::xchg(1, &vm_created) == 1) {
3233 return JNI_ERR; // already created, or create attempt in progress
3234 }
3235 if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) {
3236 return JNI_ERR; // someone tried and failed and retry not allowed.
3237 }
3239 assert(vm_created == 1, "vm_created is true during the creation");
3241 /**
3242 * Certain errors during initialization are recoverable and do not
3243 * prevent this method from being called again at a later time
3244 * (perhaps with different arguments). However, at a certain
3245 * point during initialization if an error occurs we cannot allow
3246 * this function to be called again (or it will crash). In those
3247 * situations, the 'canTryAgain' flag is set to false, which atomically
3248 * sets safe_to_recreate_vm to 1, such that any new call to
3249 * JNI_CreateJavaVM will immediately fail using the above logic.
3250 */
3251 bool can_try_again = true;
3253 result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again);
3254 if (result == JNI_OK) {
3255 JavaThread *thread = JavaThread::current();
3256 /* thread is thread_in_vm here */
3257 *vm = (JavaVM *)(&main_vm);
3258 *(JNIEnv**)penv = thread->jni_environment();
3260 // Tracks the time application was running before GC
3261 RuntimeService::record_application_start();
3263 // Notify JVMTI
3264 if (JvmtiExport::should_post_thread_life()) {
3265 JvmtiExport::post_thread_start(thread);
3266 }
3267 // Check if we should compile all classes on bootclasspath
3268 NOT_PRODUCT(if (CompileTheWorld) ClassLoader::compile_the_world();)
3269 // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving.
3270 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3271 } else {
3272 if (can_try_again) {
3273 // reset safe_to_recreate_vm to 1 so that retrial would be possible
3274 safe_to_recreate_vm = 1;
3275 }
3277 // Creation failed. We must reset vm_created
3278 *vm = 0;
3279 *(JNIEnv**)penv = 0;
3280 // reset vm_created last to avoid race condition. Use OrderAccess to
3281 // control both compiler and architectural-based reordering.
3282 OrderAccess::release_store(&vm_created, 0);
3283 }
3285 return result;
3286 }
3288 HS_DTRACE_PROBE_DECL3(hotspot_jni, GetCreatedJavaVMs__entry, \
3289 JavaVM**, jsize, jsize*);
3290 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetCreatedJavaVMs__return, jint);
3292 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vm_buf, jsize bufLen, jsize *numVMs) {
3293 // See bug 4367188, the wrapper can sometimes cause VM crashes
3294 // JNIWrapper("GetCreatedJavaVMs");
3295 HS_DTRACE_PROBE3(hotspot_jni, GetCreatedJavaVMs__entry, \
3296 vm_buf, bufLen, numVMs);
3297 if (vm_created) {
3298 if (numVMs != NULL) *numVMs = 1;
3299 if (bufLen > 0) *vm_buf = (JavaVM *)(&main_vm);
3300 } else {
3301 if (numVMs != NULL) *numVMs = 0;
3302 }
3303 HS_DTRACE_PROBE1(hotspot_jni, GetCreatedJavaVMs__return, JNI_OK);
3304 return JNI_OK;
3305 }
3307 extern "C" {
3309 DT_RETURN_MARK_DECL(DestroyJavaVM, jint);
3311 jint JNICALL jni_DestroyJavaVM(JavaVM *vm) {
3312 DTRACE_PROBE1(hotspot_jni, DestroyJavaVM__entry, vm);
3313 jint res = JNI_ERR;
3314 DT_RETURN_MARK(DestroyJavaVM, jint, (const jint&)res);
3316 if (!vm_created) {
3317 res = JNI_ERR;
3318 return res;
3319 }
3321 JNIWrapper("DestroyJavaVM");
3322 JNIEnv *env;
3323 JavaVMAttachArgs destroyargs;
3324 destroyargs.version = CurrentVersion;
3325 destroyargs.name = (char *)"DestroyJavaVM";
3326 destroyargs.group = NULL;
3327 res = vm->AttachCurrentThread((void **)&env, (void *)&destroyargs);
3328 if (res != JNI_OK) {
3329 return res;
3330 }
3332 // Since this is not a JVM_ENTRY we have to set the thread state manually before entering.
3333 JavaThread* thread = JavaThread::current();
3334 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3335 if (Threads::destroy_vm()) {
3336 // Should not change thread state, VM is gone
3337 vm_created = false;
3338 res = JNI_OK;
3339 return res;
3340 } else {
3341 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3342 res = JNI_ERR;
3343 return res;
3344 }
3345 }
3348 static jint attach_current_thread(JavaVM *vm, void **penv, void *_args, bool daemon) {
3349 JavaVMAttachArgs *args = (JavaVMAttachArgs *) _args;
3351 // Check below commented out from JDK1.2fcs as well
3352 /*
3353 if (args && (args->version != JNI_VERSION_1_1 || args->version != JNI_VERSION_1_2)) {
3354 return JNI_EVERSION;
3355 }
3356 */
3358 Thread* t = ThreadLocalStorage::get_thread_slow();
3359 if (t != NULL) {
3360 // If the thread has been attached this operation is a no-op
3361 *(JNIEnv**)penv = ((JavaThread*) t)->jni_environment();
3362 return JNI_OK;
3363 }
3365 // Create a thread and mark it as attaching so it will be skipped by the
3366 // ThreadsListEnumerator - see CR 6404306
3367 JavaThread* thread = new JavaThread(true);
3369 // Set correct safepoint info. The thread is going to call into Java when
3370 // initializing the Java level thread object. Hence, the correct state must
3371 // be set in order for the Safepoint code to deal with it correctly.
3372 thread->set_thread_state(_thread_in_vm);
3373 // Must do this before initialize_thread_local_storage
3374 thread->record_stack_base_and_size();
3375 thread->initialize_thread_local_storage();
3377 if (!os::create_attached_thread(thread)) {
3378 delete thread;
3379 return JNI_ERR;
3380 }
3381 thread->initialize_tlab();
3383 // Crucial that we do not have a safepoint check for this thread, since it has
3384 // not been added to the Thread list yet.
3385 { Threads_lock->lock_without_safepoint_check();
3386 // This must be inside this lock in order to get FullGCALot to work properly, i.e., to
3387 // avoid this thread trying to do a GC before it is added to the thread-list
3388 thread->set_active_handles(JNIHandleBlock::allocate_block());
3389 Threads::add(thread, daemon);
3390 Threads_lock->unlock();
3391 }
3392 // Create thread group and name info from attach arguments
3393 oop group = NULL;
3394 char* thread_name = NULL;
3395 if (args != NULL && Threads::is_supported_jni_version(args->version)) {
3396 group = JNIHandles::resolve(args->group);
3397 thread_name = args->name; // may be NULL
3398 }
3399 if (group == NULL) group = Universe::main_thread_group();
3401 // Create Java level thread object and attach it to this thread
3402 bool attach_failed = false;
3403 {
3404 EXCEPTION_MARK;
3405 HandleMark hm(THREAD);
3406 Handle thread_group(THREAD, group);
3407 thread->allocate_threadObj(thread_group, thread_name, daemon, THREAD);
3408 if (HAS_PENDING_EXCEPTION) {
3409 CLEAR_PENDING_EXCEPTION;
3410 // cleanup outside the handle mark.
3411 attach_failed = true;
3412 }
3413 }
3415 if (attach_failed) {
3416 // Added missing cleanup
3417 thread->cleanup_failed_attach_current_thread();
3418 return JNI_ERR;
3419 }
3421 // mark the thread as no longer attaching
3422 // this uses a fence to push the change through so we don't have
3423 // to regrab the threads_lock
3424 thread->set_attached();
3426 // Enable stack overflow checks
3427 thread->create_stack_guard_pages();
3429 // Set java thread status.
3430 java_lang_Thread::set_thread_status(thread->threadObj(),
3431 java_lang_Thread::RUNNABLE);
3433 // Notify the debugger
3434 if (JvmtiExport::should_post_thread_life()) {
3435 JvmtiExport::post_thread_start(thread);
3436 }
3438 *(JNIEnv**)penv = thread->jni_environment();
3440 // Now leaving the VM, so change thread_state. This is normally automatically taken care
3441 // of in the JVM_ENTRY. But in this situation we have to do it manually. Notice, that by
3442 // using ThreadStateTransition::transition, we do a callback to the safepoint code if
3443 // needed.
3445 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3447 // Perform any platform dependent FPU setup
3448 os::setup_fpu();
3450 return JNI_OK;
3451 }
3454 jint JNICALL jni_AttachCurrentThread(JavaVM *vm, void **penv, void *_args) {
3455 DTRACE_PROBE3(hotspot_jni, AttachCurrentThread__entry, vm, penv, _args);
3456 if (!vm_created) {
3457 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, JNI_ERR);
3458 return JNI_ERR;
3459 }
3461 JNIWrapper("AttachCurrentThread");
3462 jint ret = attach_current_thread(vm, penv, _args, false);
3463 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, ret);
3464 return ret;
3465 }
3468 jint JNICALL jni_DetachCurrentThread(JavaVM *vm) {
3469 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__entry, vm);
3470 VM_Exit::block_if_vm_exited();
3472 JNIWrapper("DetachCurrentThread");
3474 // If the thread has been deattacted the operations is a no-op
3475 if (ThreadLocalStorage::thread() == NULL) {
3476 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3477 return JNI_OK;
3478 }
3480 JavaThread* thread = JavaThread::current();
3481 if (thread->has_last_Java_frame()) {
3482 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_ERR);
3483 // Can't detach a thread that's running java, that can't work.
3484 return JNI_ERR;
3485 }
3487 // Safepoint support. Have to do call-back to safepoint code, if in the
3488 // middel of a safepoint operation
3489 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3491 // XXX: Note that JavaThread::exit() call below removes the guards on the
3492 // stack pages set up via enable_stack_{red,yellow}_zone() calls
3493 // above in jni_AttachCurrentThread. Unfortunately, while the setting
3494 // of the guards is visible in jni_AttachCurrentThread above,
3495 // the removal of the guards is buried below in JavaThread::exit()
3496 // here. The abstraction should be more symmetrically either exposed
3497 // or hidden (e.g. it could probably be hidden in the same
3498 // (platform-dependent) methods where we do alternate stack
3499 // maintenance work?)
3500 thread->exit(false, JavaThread::jni_detach);
3501 delete thread;
3503 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3504 return JNI_OK;
3505 }
3507 DT_RETURN_MARK_DECL(GetEnv, jint);
3509 jint JNICALL jni_GetEnv(JavaVM *vm, void **penv, jint version) {
3510 DTRACE_PROBE3(hotspot_jni, GetEnv__entry, vm, penv, version);
3511 jint ret = JNI_ERR;
3512 DT_RETURN_MARK(GetEnv, jint, (const jint&)ret);
3514 if (!vm_created) {
3515 *penv = NULL;
3516 ret = JNI_EDETACHED;
3517 return ret;
3518 }
3520 if (JvmtiExport::is_jvmti_version(version)) {
3521 ret = JvmtiExport::get_jvmti_interface(vm, penv, version);
3522 return ret;
3523 }
3525 #ifndef JVMPI_VERSION_1
3526 // need these in order to be polite about older agents
3527 #define JVMPI_VERSION_1 ((jint)0x10000001)
3528 #define JVMPI_VERSION_1_1 ((jint)0x10000002)
3529 #define JVMPI_VERSION_1_2 ((jint)0x10000003)
3530 #endif // !JVMPI_VERSION_1
3532 Thread* thread = ThreadLocalStorage::thread();
3533 if (thread != NULL && thread->is_Java_thread()) {
3534 if (Threads::is_supported_jni_version_including_1_1(version)) {
3535 *(JNIEnv**)penv = ((JavaThread*) thread)->jni_environment();
3536 ret = JNI_OK;
3537 return ret;
3539 } else if (version == JVMPI_VERSION_1 ||
3540 version == JVMPI_VERSION_1_1 ||
3541 version == JVMPI_VERSION_1_2) {
3542 tty->print_cr("ERROR: JVMPI, an experimental interface, is no longer supported.");
3543 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3544 ret = JNI_EVERSION;
3545 return ret;
3546 } else if (JvmtiExport::is_jvmdi_version(version)) {
3547 tty->print_cr("FATAL ERROR: JVMDI is no longer supported.");
3548 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3549 ret = JNI_EVERSION;
3550 return ret;
3551 } else {
3552 *penv = NULL;
3553 ret = JNI_EVERSION;
3554 return ret;
3555 }
3556 } else {
3557 *penv = NULL;
3558 ret = JNI_EDETACHED;
3559 return ret;
3560 }
3561 }
3564 jint JNICALL jni_AttachCurrentThreadAsDaemon(JavaVM *vm, void **penv, void *_args) {
3565 DTRACE_PROBE3(hotspot_jni, AttachCurrentThreadAsDaemon__entry, vm, penv, _args);
3566 if (!vm_created) {
3567 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, JNI_ERR);
3568 return JNI_ERR;
3569 }
3571 JNIWrapper("AttachCurrentThreadAsDaemon");
3572 jint ret = attach_current_thread(vm, penv, _args, true);
3573 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, ret);
3574 return ret;
3575 }
3578 } // End extern "C"
3580 const struct JNIInvokeInterface_ jni_InvokeInterface = {
3581 NULL,
3582 NULL,
3583 NULL,
3585 jni_DestroyJavaVM,
3586 jni_AttachCurrentThread,
3587 jni_DetachCurrentThread,
3588 jni_GetEnv,
3589 jni_AttachCurrentThreadAsDaemon
3590 };