Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/prims/jni.cpp@715dceaa89b7
src/share/vm/prims/jni.cpp
Wed, 25 Mar 2009 13:09:28 -0400
- author
- acorn
- date
- Wed, 25 Mar 2009 13:09:28 -0400
- changeset 1092
- 715dceaa89b7
- parent 1014
- 0fbdb4381b99
- child 1408
- ad6585fd4087
- permissions
- -rw-r--r--
6603316: Improve instrumentation for classes loaded at startup
Reviewed-by: xlu, mchung
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_jni.cpp.incl"
28 static jint CurrentVersion = JNI_VERSION_1_6;
31 // The DT_RETURN_MARK macros create a scoped object to fire the dtrace
32 // '-return' probe regardless of the return path is taken out of the function.
33 // Methods that have multiple return paths use this to avoid having to
34 // instrument each return path. Methods that use CHECK or THROW must use this
35 // since those macros can cause an immedate uninstrumented return.
36 //
37 // In order to get the return value, a reference to the variable containing
38 // the return value must be passed to the contructor of the object, and
39 // the return value must be set before return (since the mark object has
40 // a reference to it).
41 //
42 // Example:
43 // DT_RETURN_MARK_DECL(SomeFunc, int);
44 // JNI_ENTRY(int, SomeFunc, ...)
45 // int return_value = 0;
46 // DT_RETURN_MARK(SomeFunc, int, (const int&)return_value);
47 // foo(CHECK_0)
48 // return_value = 5;
49 // return return_value;
50 // JNI_END
51 #define DT_RETURN_MARK_DECL(name, type) \
52 HS_DTRACE_PROBE_DECL1(hotspot_jni, name##__return, type); \
53 DTRACE_ONLY( \
54 class DTraceReturnProbeMark_##name { \
55 public: \
56 const type& _ret_ref; \
57 DTraceReturnProbeMark_##name(const type& v) : _ret_ref(v) {} \
58 ~DTraceReturnProbeMark_##name() { \
59 HS_DTRACE_PROBE1(hotspot_jni, name##__return, _ret_ref); \
60 } \
61 } \
62 )
63 // Void functions are simpler since there's no return value
64 #define DT_VOID_RETURN_MARK_DECL(name) \
65 HS_DTRACE_PROBE_DECL0(hotspot_jni, name##__return); \
66 DTRACE_ONLY( \
67 class DTraceReturnProbeMark_##name { \
68 public: \
69 ~DTraceReturnProbeMark_##name() { \
70 HS_DTRACE_PROBE0(hotspot_jni, name##__return); \
71 } \
72 } \
73 )
76 // Place these macros in the function to mark the return. Non-void
77 // functions need the type and address of the return value.
78 #define DT_RETURN_MARK(name, type, ref) \
79 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark(ref) )
80 #define DT_VOID_RETURN_MARK(name) \
81 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark )
84 // Use these to select distinct code for floating-point vs. non-floating point
85 // situations. Used from within common macros where we need slightly
86 // different behavior for Float/Double
87 #define FP_SELECT_Boolean(intcode, fpcode) intcode
88 #define FP_SELECT_Byte(intcode, fpcode) intcode
89 #define FP_SELECT_Char(intcode, fpcode) intcode
90 #define FP_SELECT_Short(intcode, fpcode) intcode
91 #define FP_SELECT_Object(intcode, fpcode) intcode
92 #define FP_SELECT_Int(intcode, fpcode) intcode
93 #define FP_SELECT_Long(intcode, fpcode) intcode
94 #define FP_SELECT_Float(intcode, fpcode) fpcode
95 #define FP_SELECT_Double(intcode, fpcode) fpcode
96 #define FP_SELECT(TypeName, intcode, fpcode) \
97 FP_SELECT_##TypeName(intcode, fpcode)
99 #define COMMA ,
101 // Choose DT_RETURN_MARK macros based on the type: float/double -> void
102 // (dtrace doesn't do FP yet)
103 #define DT_RETURN_MARK_DECL_FOR(TypeName, name, type) \
104 FP_SELECT(TypeName, \
105 DT_RETURN_MARK_DECL(name, type), DT_VOID_RETURN_MARK_DECL(name) )
106 #define DT_RETURN_MARK_FOR(TypeName, name, type, ref) \
107 FP_SELECT(TypeName, \
108 DT_RETURN_MARK(name, type, ref), DT_VOID_RETURN_MARK(name) )
111 // out-of-line helpers for class jfieldIDWorkaround:
113 bool jfieldIDWorkaround::is_valid_jfieldID(klassOop k, jfieldID id) {
114 if (jfieldIDWorkaround::is_instance_jfieldID(k, id)) {
115 uintptr_t as_uint = (uintptr_t) id;
116 intptr_t offset = raw_instance_offset(id);
117 if (is_checked_jfieldID(id)) {
118 if (!klass_hash_ok(k, id)) {
119 return false;
120 }
121 }
122 return instanceKlass::cast(k)->contains_field_offset(offset);
123 } else {
124 JNIid* result = (JNIid*) id;
125 #ifdef ASSERT
126 return result != NULL && result->is_static_field_id();
127 #else
128 return result != NULL;
129 #endif
130 }
131 }
134 intptr_t jfieldIDWorkaround::encode_klass_hash(klassOop k, intptr_t offset) {
135 if (offset <= small_offset_mask) {
136 klassOop field_klass = k;
137 klassOop super_klass = Klass::cast(field_klass)->super();
138 // With compressed oops the most super class with nonstatic fields would
139 // be the owner of fields embedded in the header.
140 while (instanceKlass::cast(super_klass)->has_nonstatic_fields() &&
141 instanceKlass::cast(super_klass)->contains_field_offset(offset)) {
142 field_klass = super_klass; // super contains the field also
143 super_klass = Klass::cast(field_klass)->super();
144 }
145 debug_only(No_Safepoint_Verifier nosafepoint;)
146 uintptr_t klass_hash = field_klass->identity_hash();
147 return ((klass_hash & klass_mask) << klass_shift) | checked_mask_in_place;
148 } else {
149 #if 0
150 #ifndef PRODUCT
151 {
152 ResourceMark rm;
153 warning("VerifyJNIFields: long offset %d in %s", offset, Klass::cast(k)->external_name());
154 }
155 #endif
156 #endif
157 return 0;
158 }
159 }
161 bool jfieldIDWorkaround::klass_hash_ok(klassOop k, jfieldID id) {
162 uintptr_t as_uint = (uintptr_t) id;
163 intptr_t klass_hash = (as_uint >> klass_shift) & klass_mask;
164 do {
165 debug_only(No_Safepoint_Verifier nosafepoint;)
166 // Could use a non-blocking query for identity_hash here...
167 if ((k->identity_hash() & klass_mask) == klass_hash)
168 return true;
169 k = Klass::cast(k)->super();
170 } while (k != NULL);
171 return false;
172 }
174 void jfieldIDWorkaround::verify_instance_jfieldID(klassOop k, jfieldID id) {
175 guarantee(jfieldIDWorkaround::is_instance_jfieldID(k, id), "must be an instance field" );
176 uintptr_t as_uint = (uintptr_t) id;
177 intptr_t offset = raw_instance_offset(id);
178 if (VerifyJNIFields) {
179 if (is_checked_jfieldID(id)) {
180 guarantee(klass_hash_ok(k, id),
181 "Bug in native code: jfieldID class must match object");
182 } else {
183 #if 0
184 #ifndef PRODUCT
185 if (Verbose) {
186 ResourceMark rm;
187 warning("VerifyJNIFields: unverified offset %d for %s", offset, Klass::cast(k)->external_name());
188 }
189 #endif
190 #endif
191 }
192 }
193 guarantee(instanceKlass::cast(k)->contains_field_offset(offset),
194 "Bug in native code: jfieldID offset must address interior of object");
195 }
197 // Pick a reasonable higher bound for local capacity requested
198 // for EnsureLocalCapacity and PushLocalFrame. We don't want it too
199 // high because a test (or very unusual application) may try to allocate
200 // that many handles and run out of swap space. An implementation is
201 // permitted to allocate more handles than the ensured capacity, so this
202 // value is set high enough to prevent compatibility problems.
203 const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K;
206 // Wrapper to trace JNI functions
208 #ifdef ASSERT
209 Histogram* JNIHistogram;
210 static volatile jint JNIHistogram_lock = 0;
212 class JNITraceWrapper : public StackObj {
213 public:
214 JNITraceWrapper(const char* format, ...) {
215 if (TraceJNICalls) {
216 va_list ap;
217 va_start(ap, format);
218 tty->print("JNI ");
219 tty->vprint_cr(format, ap);
220 va_end(ap);
221 }
222 }
223 };
225 class JNIHistogramElement : public HistogramElement {
226 public:
227 JNIHistogramElement(const char* name);
228 };
230 JNIHistogramElement::JNIHistogramElement(const char* elementName) {
231 _name = elementName;
232 uintx count = 0;
234 while (Atomic::cmpxchg(1, &JNIHistogram_lock, 0) != 0) {
235 while (OrderAccess::load_acquire(&JNIHistogram_lock) != 0) {
236 count +=1;
237 if ( (WarnOnStalledSpinLock > 0)
238 && (count % WarnOnStalledSpinLock == 0)) {
239 warning("JNIHistogram_lock seems to be stalled");
240 }
241 }
242 }
245 if(JNIHistogram == NULL)
246 JNIHistogram = new Histogram("JNI Call Counts",100);
248 JNIHistogram->add_element(this);
249 Atomic::dec(&JNIHistogram_lock);
250 }
252 #define JNICountWrapper(arg) \
253 static JNIHistogramElement* e = new JNIHistogramElement(arg); \
254 /* There is a MT-race condition in VC++. So we need to make sure that that e has been initialized */ \
255 if (e != NULL) e->increment_count()
256 #define JNIWrapper(arg) JNICountWrapper(arg); JNITraceWrapper(arg)
257 #else
258 #define JNIWrapper(arg)
259 #endif
262 // Implementation of JNI entries
264 DT_RETURN_MARK_DECL(DefineClass, jclass);
266 JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef,
267 const jbyte *buf, jsize bufLen))
268 JNIWrapper("DefineClass");
270 DTRACE_PROBE5(hotspot_jni, DefineClass__entry,
271 env, name, loaderRef, buf, bufLen);
272 jclass cls = NULL;
273 DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls);
275 // Since exceptions can be thrown, class initialization can take place
276 // if name is NULL no check for class name in .class stream has to be made.
277 symbolHandle class_name;
278 if (name != NULL) {
279 const int str_len = (int)strlen(name);
280 if (str_len > symbolOopDesc::max_length()) {
281 // It's impossible to create this class; the name cannot fit
282 // into the constant pool.
283 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
284 }
285 class_name = oopFactory::new_symbol_handle(name, str_len, CHECK_NULL);
286 }
288 ResourceMark rm(THREAD);
289 ClassFileStream st((u1*) buf, bufLen, NULL);
290 Handle class_loader (THREAD, JNIHandles::resolve(loaderRef));
292 if (UsePerfData && !class_loader.is_null()) {
293 // check whether the current caller thread holds the lock or not.
294 // If not, increment the corresponding counter
295 if (ObjectSynchronizer::
296 query_lock_ownership((JavaThread*)THREAD, class_loader) !=
297 ObjectSynchronizer::owner_self) {
298 ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc();
299 }
300 }
301 klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
302 Handle(), &st, CHECK_NULL);
304 if (TraceClassResolution && k != NULL) {
305 trace_class_resolution(k);
306 }
308 cls = (jclass)JNIHandles::make_local(
309 env, Klass::cast(k)->java_mirror());
310 return cls;
311 JNI_END
315 static bool first_time_FindClass = true;
317 DT_RETURN_MARK_DECL(FindClass, jclass);
319 JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name))
320 JNIWrapper("FindClass");
321 DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name);
323 jclass result = NULL;
324 DT_RETURN_MARK(FindClass, jclass, (const jclass&)result);
326 // Remember if we are the first invocation of jni_FindClass
327 bool first_time = first_time_FindClass;
328 first_time_FindClass = false;
330 // Sanity check the name: it cannot be null or larger than the maximum size
331 // name we can fit in the constant pool.
332 if (name == NULL || (int)strlen(name) > symbolOopDesc::max_length()) {
333 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
334 }
336 //%note jni_3
337 Handle loader;
338 Handle protection_domain;
339 // Find calling class
340 instanceKlassHandle k (THREAD, thread->security_get_caller_class(0));
341 if (k.not_null()) {
342 loader = Handle(THREAD, k->class_loader());
343 // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed
344 // in the correct class context.
345 if (loader.is_null() &&
346 k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
347 JavaValue result(T_OBJECT);
348 JavaCalls::call_static(&result, k,
349 vmSymbolHandles::getFromClass_name(),
350 vmSymbolHandles::void_class_signature(),
351 thread);
352 if (HAS_PENDING_EXCEPTION) {
353 Handle ex(thread, thread->pending_exception());
354 CLEAR_PENDING_EXCEPTION;
355 THROW_HANDLE_0(ex);
356 }
357 oop mirror = (oop) result.get_jobject();
358 loader = Handle(THREAD,
359 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader());
360 protection_domain = Handle(THREAD,
361 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain());
362 }
363 } else {
364 // We call ClassLoader.getSystemClassLoader to obtain the system class loader.
365 loader = Handle(THREAD, SystemDictionary::java_system_loader());
366 }
368 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
369 result = find_class_from_class_loader(env, sym, true, loader,
370 protection_domain, true, thread);
372 if (TraceClassResolution && result != NULL) {
373 trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
374 }
376 // If we were the first invocation of jni_FindClass, we enable compilation again
377 // rather than just allowing invocation counter to overflow and decay.
378 // Controlled by flag DelayCompilationDuringStartup.
379 if (first_time && !CompileTheWorld)
380 CompilationPolicy::completed_vm_startup();
382 return result;
383 JNI_END
385 DT_RETURN_MARK_DECL(FromReflectedMethod, jmethodID);
387 JNI_ENTRY(jmethodID, jni_FromReflectedMethod(JNIEnv *env, jobject method))
388 JNIWrapper("FromReflectedMethod");
389 DTRACE_PROBE2(hotspot_jni, FromReflectedMethod__entry, env, method);
390 jmethodID ret = NULL;
391 DT_RETURN_MARK(FromReflectedMethod, jmethodID, (const jmethodID&)ret);
393 // method is a handle to a java.lang.reflect.Method object
394 oop reflected = JNIHandles::resolve_non_null(method);
395 oop mirror = NULL;
396 int slot = 0;
398 if (reflected->klass() == SystemDictionary::reflect_constructor_klass()) {
399 mirror = java_lang_reflect_Constructor::clazz(reflected);
400 slot = java_lang_reflect_Constructor::slot(reflected);
401 } else {
402 assert(reflected->klass() == SystemDictionary::reflect_method_klass(), "wrong type");
403 mirror = java_lang_reflect_Method::clazz(reflected);
404 slot = java_lang_reflect_Method::slot(reflected);
405 }
406 klassOop k = java_lang_Class::as_klassOop(mirror);
408 KlassHandle k1(THREAD, k);
409 // Make sure class is initialized before handing id's out to methods
410 Klass::cast(k1())->initialize(CHECK_NULL);
411 methodOop m = instanceKlass::cast(k1())->method_with_idnum(slot);
412 ret = m==NULL? NULL : m->jmethod_id(); // return NULL if reflected method deleted
413 return ret;
414 JNI_END
416 DT_RETURN_MARK_DECL(FromReflectedField, jfieldID);
418 JNI_ENTRY(jfieldID, jni_FromReflectedField(JNIEnv *env, jobject field))
419 JNIWrapper("FromReflectedField");
420 DTRACE_PROBE2(hotspot_jni, FromReflectedField__entry, env, field);
421 jfieldID ret = NULL;
422 DT_RETURN_MARK(FromReflectedField, jfieldID, (const jfieldID&)ret);
424 // field is a handle to a java.lang.reflect.Field object
425 oop reflected = JNIHandles::resolve_non_null(field);
426 oop mirror = java_lang_reflect_Field::clazz(reflected);
427 klassOop k = java_lang_Class::as_klassOop(mirror);
428 int slot = java_lang_reflect_Field::slot(reflected);
429 int modifiers = java_lang_reflect_Field::modifiers(reflected);
431 KlassHandle k1(THREAD, k);
432 // Make sure class is initialized before handing id's out to fields
433 Klass::cast(k1())->initialize(CHECK_NULL);
435 // First check if this is a static field
436 if (modifiers & JVM_ACC_STATIC) {
437 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
438 JNIid* id = instanceKlass::cast(k1())->jni_id_for(offset);
439 assert(id != NULL, "corrupt Field object");
440 debug_only(id->set_is_static_field_id();)
441 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
442 ret = jfieldIDWorkaround::to_static_jfieldID(id);
443 return ret;
444 }
446 // The slot is the index of the field description in the field-array
447 // The jfieldID is the offset of the field within the object
448 // It may also have hash bits for k, if VerifyJNIFields is turned on.
449 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
450 assert(instanceKlass::cast(k1())->contains_field_offset(offset), "stay within object");
451 ret = jfieldIDWorkaround::to_instance_jfieldID(k1(), offset);
452 return ret;
453 JNI_END
455 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject);
457 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
458 JNIWrapper("ToReflectedMethod");
459 DTRACE_PROBE4(hotspot_jni, ToReflectedMethod__entry, env, cls, method_id, isStatic);
460 jobject ret = NULL;
461 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
463 methodHandle m (THREAD, JNIHandles::resolve_jmethod_id(method_id));
464 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
465 oop reflection_method;
466 if (m->is_initializer()) {
467 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
468 } else {
469 reflection_method = Reflection::new_method(m, UseNewReflection, false, CHECK_NULL);
470 }
471 ret = JNIHandles::make_local(env, reflection_method);
472 return ret;
473 JNI_END
475 DT_RETURN_MARK_DECL(GetSuperclass, jclass);
477 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
478 JNIWrapper("GetSuperclass");
479 DTRACE_PROBE2(hotspot_jni, GetSuperclass__entry, env, sub);
480 jclass obj = NULL;
481 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
483 oop mirror = JNIHandles::resolve_non_null(sub);
484 // primitive classes return NULL
485 if (java_lang_Class::is_primitive(mirror)) return NULL;
487 // Rules of Class.getSuperClass as implemented by KLass::java_super:
488 // arrays return Object
489 // interfaces return NULL
490 // proper classes return Klass::super()
491 klassOop k = java_lang_Class::as_klassOop(mirror);
492 if (Klass::cast(k)->is_interface()) return NULL;
494 // return mirror for superclass
495 klassOop super = Klass::cast(k)->java_super();
496 // super2 is the value computed by the compiler's getSuperClass intrinsic:
497 debug_only(klassOop super2 = ( Klass::cast(k)->oop_is_javaArray()
498 ? SystemDictionary::object_klass()
499 : Klass::cast(k)->super() ) );
500 assert(super == super2,
501 "java_super computation depends on interface, array, other super");
502 obj = (super == NULL) ? NULL : (jclass) JNIHandles::make_local(Klass::cast(super)->java_mirror());
503 return obj;
504 JNI_END
506 JNI_QUICK_ENTRY(jboolean, jni_IsAssignableFrom(JNIEnv *env, jclass sub, jclass super))
507 JNIWrapper("IsSubclassOf");
508 DTRACE_PROBE3(hotspot_jni, IsAssignableFrom__entry, env, sub, super);
509 oop sub_mirror = JNIHandles::resolve_non_null(sub);
510 oop super_mirror = JNIHandles::resolve_non_null(super);
511 if (java_lang_Class::is_primitive(sub_mirror) ||
512 java_lang_Class::is_primitive(super_mirror)) {
513 jboolean ret = (sub_mirror == super_mirror);
514 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
515 return ret;
516 }
517 klassOop sub_klass = java_lang_Class::as_klassOop(sub_mirror);
518 klassOop super_klass = java_lang_Class::as_klassOop(super_mirror);
519 assert(sub_klass != NULL && super_klass != NULL, "invalid arguments to jni_IsAssignableFrom");
520 jboolean ret = Klass::cast(sub_klass)->is_subtype_of(super_klass) ?
521 JNI_TRUE : JNI_FALSE;
522 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
523 return ret;
524 JNI_END
526 DT_RETURN_MARK_DECL(Throw, jint);
528 JNI_ENTRY(jint, jni_Throw(JNIEnv *env, jthrowable obj))
529 JNIWrapper("Throw");
530 DTRACE_PROBE2(hotspot_jni, Throw__entry, env, obj);
531 jint ret = JNI_OK;
532 DT_RETURN_MARK(Throw, jint, (const jint&)ret);
534 THROW_OOP_(JNIHandles::resolve(obj), JNI_OK);
535 ShouldNotReachHere();
536 JNI_END
538 DT_RETURN_MARK_DECL(ThrowNew, jint);
540 JNI_ENTRY(jint, jni_ThrowNew(JNIEnv *env, jclass clazz, const char *message))
541 JNIWrapper("ThrowNew");
542 DTRACE_PROBE3(hotspot_jni, ThrowNew__entry, env, clazz, message);
543 jint ret = JNI_OK;
544 DT_RETURN_MARK(ThrowNew, jint, (const jint&)ret);
546 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
547 symbolHandle name = symbolHandle(THREAD, k->name());
548 Handle class_loader (THREAD, k->class_loader());
549 Handle protection_domain (THREAD, k->protection_domain());
550 THROW_MSG_LOADER_(name, (char *)message, class_loader, protection_domain, JNI_OK);
551 ShouldNotReachHere();
552 JNI_END
555 // JNI functions only transform a pending async exception to a synchronous
556 // exception in ExceptionOccurred and ExceptionCheck calls, since
557 // delivering an async exception in other places won't change the native
558 // code's control flow and would be harmful when native code further calls
559 // JNI functions with a pending exception. Async exception is also checked
560 // during the call, so ExceptionOccurred/ExceptionCheck won't return
561 // false but deliver the async exception at the very end during
562 // state transition.
564 static void jni_check_async_exceptions(JavaThread *thread) {
565 assert(thread == Thread::current(), "must be itself");
566 thread->check_and_handle_async_exceptions();
567 }
569 JNI_ENTRY_NO_PRESERVE(jthrowable, jni_ExceptionOccurred(JNIEnv *env))
570 JNIWrapper("ExceptionOccurred");
571 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__entry, env);
572 jni_check_async_exceptions(thread);
573 oop exception = thread->pending_exception();
574 jthrowable ret = (jthrowable) JNIHandles::make_local(env, exception);
575 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__return, ret);
576 return ret;
577 JNI_END
580 JNI_ENTRY_NO_PRESERVE(void, jni_ExceptionDescribe(JNIEnv *env))
581 JNIWrapper("ExceptionDescribe");
582 DTRACE_PROBE1(hotspot_jni, ExceptionDescribe__entry, env);
583 if (thread->has_pending_exception()) {
584 Handle ex(thread, thread->pending_exception());
585 thread->clear_pending_exception();
586 if (ex->is_a(SystemDictionary::threaddeath_klass())) {
587 // Don't print anything if we are being killed.
588 } else {
589 jio_fprintf(defaultStream::error_stream(), "Exception ");
590 if (thread != NULL && thread->threadObj() != NULL) {
591 ResourceMark rm(THREAD);
592 jio_fprintf(defaultStream::error_stream(),
593 "in thread \"%s\" ", thread->get_thread_name());
594 }
595 if (ex->is_a(SystemDictionary::throwable_klass())) {
596 JavaValue result(T_VOID);
597 JavaCalls::call_virtual(&result,
598 ex,
599 KlassHandle(THREAD,
600 SystemDictionary::throwable_klass()),
601 vmSymbolHandles::printStackTrace_name(),
602 vmSymbolHandles::void_method_signature(),
603 THREAD);
604 // If an exception is thrown in the call it gets thrown away. Not much
605 // we can do with it. The native code that calls this, does not check
606 // for the exception - hence, it might still be in the thread when DestroyVM gets
607 // called, potentially causing a few asserts to trigger - since no pending exception
608 // is expected.
609 CLEAR_PENDING_EXCEPTION;
610 } else {
611 ResourceMark rm(THREAD);
612 jio_fprintf(defaultStream::error_stream(),
613 ". Uncaught exception of type %s.",
614 Klass::cast(ex->klass())->external_name());
615 }
616 }
617 }
618 DTRACE_PROBE(hotspot_jni, ExceptionDescribe__return);
619 JNI_END
622 JNI_QUICK_ENTRY(void, jni_ExceptionClear(JNIEnv *env))
623 JNIWrapper("ExceptionClear");
624 DTRACE_PROBE1(hotspot_jni, ExceptionClear__entry, env);
626 // The jni code might be using this API to clear java thrown exception.
627 // So just mark jvmti thread exception state as exception caught.
628 JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state();
629 if (state != NULL && state->is_exception_detected()) {
630 state->set_exception_caught();
631 }
632 thread->clear_pending_exception();
633 DTRACE_PROBE(hotspot_jni, ExceptionClear__return);
634 JNI_END
637 JNI_ENTRY(void, jni_FatalError(JNIEnv *env, const char *msg))
638 JNIWrapper("FatalError");
639 DTRACE_PROBE2(hotspot_jni, FatalError__entry, env, msg);
640 tty->print_cr("FATAL ERROR in native method: %s", msg);
641 thread->print_stack();
642 os::abort(); // Dump core and abort
643 JNI_END
646 JNI_ENTRY(jint, jni_PushLocalFrame(JNIEnv *env, jint capacity))
647 JNIWrapper("PushLocalFrame");
648 DTRACE_PROBE2(hotspot_jni, PushLocalFrame__entry, env, capacity);
649 //%note jni_11
650 if (capacity < 0 && capacity > MAX_REASONABLE_LOCAL_CAPACITY) {
651 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, JNI_ERR);
652 return JNI_ERR;
653 }
654 JNIHandleBlock* old_handles = thread->active_handles();
655 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
656 assert(new_handles != NULL, "should not be NULL");
657 new_handles->set_pop_frame_link(old_handles);
658 thread->set_active_handles(new_handles);
659 jint ret = JNI_OK;
660 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, ret);
661 return ret;
662 JNI_END
665 JNI_ENTRY(jobject, jni_PopLocalFrame(JNIEnv *env, jobject result))
666 JNIWrapper("PopLocalFrame");
667 DTRACE_PROBE2(hotspot_jni, PopLocalFrame__entry, env, result);
668 //%note jni_11
669 Handle result_handle(thread, JNIHandles::resolve(result));
670 JNIHandleBlock* old_handles = thread->active_handles();
671 JNIHandleBlock* new_handles = old_handles->pop_frame_link();
672 if (new_handles != NULL) {
673 // As a sanity check we only release the handle blocks if the pop_frame_link is not NULL.
674 // This way code will still work if PopLocalFrame is called without a corresponding
675 // PushLocalFrame call. Note that we set the pop_frame_link to NULL explicitly, otherwise
676 // the release_block call will release the blocks.
677 thread->set_active_handles(new_handles);
678 old_handles->set_pop_frame_link(NULL); // clear link we won't release new_handles below
679 JNIHandleBlock::release_block(old_handles, thread); // may block
680 result = JNIHandles::make_local(thread, result_handle());
681 }
682 DTRACE_PROBE1(hotspot_jni, PopLocalFrame__return, result);
683 return result;
684 JNI_END
687 JNI_ENTRY(jobject, jni_NewGlobalRef(JNIEnv *env, jobject ref))
688 JNIWrapper("NewGlobalRef");
689 DTRACE_PROBE2(hotspot_jni, NewGlobalRef__entry, env, ref);
690 Handle ref_handle(thread, JNIHandles::resolve(ref));
691 jobject ret = JNIHandles::make_global(ref_handle);
692 DTRACE_PROBE1(hotspot_jni, NewGlobalRef__return, ret);
693 return ret;
694 JNI_END
696 // Must be JNI_ENTRY (with HandleMark)
697 JNI_ENTRY_NO_PRESERVE(void, jni_DeleteGlobalRef(JNIEnv *env, jobject ref))
698 JNIWrapper("DeleteGlobalRef");
699 DTRACE_PROBE2(hotspot_jni, DeleteGlobalRef__entry, env, ref);
700 JNIHandles::destroy_global(ref);
701 DTRACE_PROBE(hotspot_jni, DeleteGlobalRef__return);
702 JNI_END
704 JNI_QUICK_ENTRY(void, jni_DeleteLocalRef(JNIEnv *env, jobject obj))
705 JNIWrapper("DeleteLocalRef");
706 DTRACE_PROBE2(hotspot_jni, DeleteLocalRef__entry, env, obj);
707 JNIHandles::destroy_local(obj);
708 DTRACE_PROBE(hotspot_jni, DeleteLocalRef__return);
709 JNI_END
711 JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2))
712 JNIWrapper("IsSameObject");
713 DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2);
714 oop a = JNIHandles::resolve(r1);
715 oop b = JNIHandles::resolve(r2);
716 jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE;
717 DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret);
718 return ret;
719 JNI_END
722 JNI_ENTRY(jobject, jni_NewLocalRef(JNIEnv *env, jobject ref))
723 JNIWrapper("NewLocalRef");
724 DTRACE_PROBE2(hotspot_jni, NewLocalRef__entry, env, ref);
725 jobject ret = JNIHandles::make_local(env, JNIHandles::resolve(ref));
726 DTRACE_PROBE1(hotspot_jni, NewLocalRef__return, ret);
727 return ret;
728 JNI_END
730 JNI_LEAF(jint, jni_EnsureLocalCapacity(JNIEnv *env, jint capacity))
731 JNIWrapper("EnsureLocalCapacity");
732 DTRACE_PROBE2(hotspot_jni, EnsureLocalCapacity__entry, env, capacity);
733 jint ret;
734 if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) {
735 ret = JNI_OK;
736 } else {
737 ret = JNI_ERR;
738 }
739 DTRACE_PROBE1(hotspot_jni, EnsureLocalCapacity__return, ret);
740 return ret;
741 JNI_END
743 // Return the Handle Type
744 JNI_LEAF(jobjectRefType, jni_GetObjectRefType(JNIEnv *env, jobject obj))
745 JNIWrapper("GetObjectRefType");
746 DTRACE_PROBE2(hotspot_jni, GetObjectRefType__entry, env, obj);
747 jobjectRefType ret;
748 if (JNIHandles::is_local_handle(thread, obj) ||
749 JNIHandles::is_frame_handle(thread, obj))
750 ret = JNILocalRefType;
751 else if (JNIHandles::is_global_handle(obj))
752 ret = JNIGlobalRefType;
753 else if (JNIHandles::is_weak_global_handle(obj))
754 ret = JNIWeakGlobalRefType;
755 else
756 ret = JNIInvalidRefType;
757 DTRACE_PROBE1(hotspot_jni, GetObjectRefType__return, ret);
758 return ret;
759 JNI_END
762 class JNI_ArgumentPusher : public SignatureIterator {
763 protected:
764 JavaCallArguments* _arguments;
766 virtual void get_bool () = 0;
767 virtual void get_char () = 0;
768 virtual void get_short () = 0;
769 virtual void get_byte () = 0;
770 virtual void get_int () = 0;
771 virtual void get_long () = 0;
772 virtual void get_float () = 0;
773 virtual void get_double () = 0;
774 virtual void get_object () = 0;
776 JNI_ArgumentPusher(Thread *thread, symbolOop signature)
777 : SignatureIterator(thread, signature) {
778 this->_return_type = T_ILLEGAL;
779 _arguments = NULL;
780 }
782 public:
783 virtual void iterate( uint64_t fingerprint ) = 0;
785 void set_java_argument_object(JavaCallArguments *arguments) { _arguments = arguments; }
787 inline void do_bool() { if (!is_return_type()) get_bool(); }
788 inline void do_char() { if (!is_return_type()) get_char(); }
789 inline void do_short() { if (!is_return_type()) get_short(); }
790 inline void do_byte() { if (!is_return_type()) get_byte(); }
791 inline void do_int() { if (!is_return_type()) get_int(); }
792 inline void do_long() { if (!is_return_type()) get_long(); }
793 inline void do_float() { if (!is_return_type()) get_float(); }
794 inline void do_double() { if (!is_return_type()) get_double(); }
795 inline void do_object(int begin, int end) { if (!is_return_type()) get_object(); }
796 inline void do_array(int begin, int end) { if (!is_return_type()) get_object(); } // do_array uses get_object -- there is no get_array
797 inline void do_void() { }
799 JavaCallArguments* arguments() { return _arguments; }
800 void push_receiver(Handle h) { _arguments->push_oop(h); }
801 };
804 class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher {
805 protected:
806 va_list _ap;
808 inline void get_bool() { _arguments->push_int(va_arg(_ap, jint)); } // bool is coerced to int when using va_arg
809 inline void get_char() { _arguments->push_int(va_arg(_ap, jint)); } // char is coerced to int when using va_arg
810 inline void get_short() { _arguments->push_int(va_arg(_ap, jint)); } // short is coerced to int when using va_arg
811 inline void get_byte() { _arguments->push_int(va_arg(_ap, jint)); } // byte is coerced to int when using va_arg
812 inline void get_int() { _arguments->push_int(va_arg(_ap, jint)); }
814 // each of these paths is exercized by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
816 inline void get_long() { _arguments->push_long(va_arg(_ap, jlong)); }
817 inline void get_float() { _arguments->push_float((jfloat)va_arg(_ap, jdouble)); } // float is coerced to double w/ va_arg
818 inline void get_double() { _arguments->push_double(va_arg(_ap, jdouble)); }
819 inline void get_object() { jobject l = va_arg(_ap, jobject);
820 _arguments->push_oop(Handle((oop *)l, false)); }
822 inline void set_ap(va_list rap) {
823 #ifdef va_copy
824 va_copy(_ap, rap);
825 #elif defined (__va_copy)
826 __va_copy(_ap, rap);
827 #else
828 _ap = rap;
829 #endif
830 }
832 public:
833 JNI_ArgumentPusherVaArg(Thread *thread, symbolOop signature, va_list rap)
834 : JNI_ArgumentPusher(thread, signature) {
835 set_ap(rap);
836 }
837 JNI_ArgumentPusherVaArg(Thread *thread, jmethodID method_id, va_list rap)
838 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
839 set_ap(rap);
840 }
842 // Optimized path if we have the bitvector form of signature
843 void iterate( uint64_t fingerprint ) {
844 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate();// Must be too many arguments
845 else {
846 _return_type = (BasicType)((fingerprint >> static_feature_size) &
847 result_feature_mask);
849 assert(fingerprint, "Fingerprint should not be 0");
850 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
851 while ( 1 ) {
852 switch ( fingerprint & parameter_feature_mask ) {
853 case bool_parm:
854 case char_parm:
855 case short_parm:
856 case byte_parm:
857 case int_parm:
858 get_int();
859 break;
860 case obj_parm:
861 get_object();
862 break;
863 case long_parm:
864 get_long();
865 break;
866 case float_parm:
867 get_float();
868 break;
869 case double_parm:
870 get_double();
871 break;
872 case done_parm:
873 return;
874 break;
875 default:
876 ShouldNotReachHere();
877 break;
878 }
879 fingerprint >>= parameter_feature_size;
880 }
881 }
882 }
883 };
886 class JNI_ArgumentPusherArray : public JNI_ArgumentPusher {
887 protected:
888 const jvalue *_ap;
890 inline void get_bool() { _arguments->push_int((jint)(_ap++)->z); }
891 inline void get_char() { _arguments->push_int((jint)(_ap++)->c); }
892 inline void get_short() { _arguments->push_int((jint)(_ap++)->s); }
893 inline void get_byte() { _arguments->push_int((jint)(_ap++)->b); }
894 inline void get_int() { _arguments->push_int((jint)(_ap++)->i); }
896 inline void get_long() { _arguments->push_long((_ap++)->j); }
897 inline void get_float() { _arguments->push_float((_ap++)->f); }
898 inline void get_double() { _arguments->push_double((_ap++)->d);}
899 inline void get_object() { _arguments->push_oop(Handle((oop *)(_ap++)->l, false)); }
901 inline void set_ap(const jvalue *rap) { _ap = rap; }
903 public:
904 JNI_ArgumentPusherArray(Thread *thread, symbolOop signature, const jvalue *rap)
905 : JNI_ArgumentPusher(thread, signature) {
906 set_ap(rap);
907 }
908 JNI_ArgumentPusherArray(Thread *thread, jmethodID method_id, const jvalue *rap)
909 : JNI_ArgumentPusher(thread, JNIHandles::resolve_jmethod_id(method_id)->signature()) {
910 set_ap(rap);
911 }
913 // Optimized path if we have the bitvector form of signature
914 void iterate( uint64_t fingerprint ) {
915 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate(); // Must be too many arguments
916 else {
917 _return_type = (BasicType)((fingerprint >> static_feature_size) &
918 result_feature_mask);
919 assert(fingerprint, "Fingerprint should not be 0");
920 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
921 while ( 1 ) {
922 switch ( fingerprint & parameter_feature_mask ) {
923 case bool_parm:
924 get_bool();
925 break;
926 case char_parm:
927 get_char();
928 break;
929 case short_parm:
930 get_short();
931 break;
932 case byte_parm:
933 get_byte();
934 break;
935 case int_parm:
936 get_int();
937 break;
938 case obj_parm:
939 get_object();
940 break;
941 case long_parm:
942 get_long();
943 break;
944 case float_parm:
945 get_float();
946 break;
947 case double_parm:
948 get_double();
949 break;
950 case done_parm:
951 return;
952 break;
953 default:
954 ShouldNotReachHere();
955 break;
956 }
957 fingerprint >>= parameter_feature_size;
958 }
959 }
960 }
961 };
964 enum JNICallType {
965 JNI_STATIC,
966 JNI_VIRTUAL,
967 JNI_NONVIRTUAL
968 };
970 static methodHandle jni_resolve_interface_call(Handle recv, methodHandle method, TRAPS) {
971 assert(!method.is_null() , "method should not be null");
973 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
974 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
975 KlassHandle spec_klass (THREAD, method->method_holder());
976 symbolHandle name (THREAD, method->name());
977 symbolHandle signature (THREAD, method->signature());
978 CallInfo info;
979 LinkResolver::resolve_interface_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
980 return info.selected_method();
981 }
983 static methodHandle jni_resolve_virtual_call(Handle recv, methodHandle method, TRAPS) {
984 assert(!method.is_null() , "method should not be null");
986 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
987 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
988 KlassHandle spec_klass (THREAD, method->method_holder());
989 symbolHandle name (THREAD, method->name());
990 symbolHandle signature (THREAD, method->signature());
991 CallInfo info;
992 LinkResolver::resolve_virtual_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
993 return info.selected_method();
994 }
998 static void jni_invoke_static(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
999 methodHandle method(THREAD, JNIHandles::resolve_jmethod_id(method_id));
1001 // Create object to hold arguments for the JavaCall, and associate it with
1002 // the jni parser
1003 ResourceMark rm(THREAD);
1004 int number_of_parameters = method->size_of_parameters();
1005 JavaCallArguments java_args(number_of_parameters);
1006 args->set_java_argument_object(&java_args);
1008 assert(method->is_static(), "method should be static");
1010 // Fill out JavaCallArguments object
1011 args->iterate( Fingerprinter(THREAD, method).fingerprint() );
1012 // Initialize result type
1013 result->set_type(args->get_ret_type());
1015 // Invoke the method. Result is returned as oop.
1016 JavaCalls::call(result, method, &java_args, CHECK);
1018 // Convert result
1019 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1020 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1021 }
1022 }
1025 static void jni_invoke_nonstatic(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
1026 oop recv = JNIHandles::resolve(receiver);
1027 if (recv == NULL) {
1028 THROW(vmSymbols::java_lang_NullPointerException());
1029 }
1030 Handle h_recv(THREAD, recv);
1032 int number_of_parameters;
1033 methodOop selected_method;
1034 {
1035 methodOop m = JNIHandles::resolve_jmethod_id(method_id);
1036 number_of_parameters = m->size_of_parameters();
1037 klassOop holder = m->method_holder();
1038 if (!(Klass::cast(holder))->is_interface()) {
1039 // non-interface call -- for that little speed boost, don't handlize
1040 debug_only(No_Safepoint_Verifier nosafepoint;)
1041 if (call_type == JNI_VIRTUAL) {
1042 // jni_GetMethodID makes sure class is linked and initialized
1043 // so m should have a valid vtable index.
1044 int vtbl_index = m->vtable_index();
1045 if (vtbl_index != methodOopDesc::nonvirtual_vtable_index) {
1046 klassOop k = h_recv->klass();
1047 // k might be an arrayKlassOop but all vtables start at
1048 // the same place. The cast is to avoid virtual call and assertion.
1049 instanceKlass *ik = (instanceKlass*)k->klass_part();
1050 selected_method = ik->method_at_vtable(vtbl_index);
1051 } else {
1052 // final method
1053 selected_method = m;
1054 }
1055 } else {
1056 // JNI_NONVIRTUAL call
1057 selected_method = m;
1058 }
1059 } else {
1060 // interface call
1061 KlassHandle h_holder(THREAD, holder);
1063 int itbl_index = m->cached_itable_index();
1064 if (itbl_index == -1) {
1065 itbl_index = klassItable::compute_itable_index(m);
1066 m->set_cached_itable_index(itbl_index);
1067 // the above may have grabbed a lock, 'm' and anything non-handlized can't be used again
1068 }
1069 klassOop k = h_recv->klass();
1070 selected_method = instanceKlass::cast(k)->method_at_itable(h_holder(), itbl_index, CHECK);
1071 }
1072 }
1074 methodHandle method(THREAD, selected_method);
1076 // Create object to hold arguments for the JavaCall, and associate it with
1077 // the jni parser
1078 ResourceMark rm(THREAD);
1079 JavaCallArguments java_args(number_of_parameters);
1080 args->set_java_argument_object(&java_args);
1082 // handle arguments
1083 assert(!method->is_static(), "method should not be static");
1084 args->push_receiver(h_recv); // Push jobject handle
1086 // Fill out JavaCallArguments object
1087 args->iterate( Fingerprinter(THREAD, method).fingerprint() );
1088 // Initialize result type
1089 result->set_type(args->get_ret_type());
1091 // Invoke the method. Result is returned as oop.
1092 JavaCalls::call(result, method, &java_args, CHECK);
1094 // Convert result
1095 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1096 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1097 }
1098 }
1101 static instanceOop alloc_object(jclass clazz, TRAPS) {
1102 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1103 Klass::cast(k())->check_valid_for_instantiation(false, CHECK_NULL);
1104 instanceKlass::cast(k())->initialize(CHECK_NULL);
1105 instanceOop ih = instanceKlass::cast(k())->allocate_instance(THREAD);
1106 return ih;
1107 }
1109 DT_RETURN_MARK_DECL(AllocObject, jobject);
1111 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
1112 JNIWrapper("AllocObject");
1114 DTRACE_PROBE2(hotspot_jni, AllocObject__entry, env, clazz);
1115 jobject ret = NULL;
1116 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
1118 instanceOop i = alloc_object(clazz, CHECK_NULL);
1119 ret = JNIHandles::make_local(env, i);
1120 return ret;
1121 JNI_END
1123 DT_RETURN_MARK_DECL(NewObjectA, jobject);
1125 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
1126 JNIWrapper("NewObjectA");
1127 DTRACE_PROBE3(hotspot_jni, NewObjectA__entry, env, clazz, methodID);
1128 jobject obj = NULL;
1129 DT_RETURN_MARK(NewObjectA, jobject, (const jobject)obj);
1131 instanceOop i = alloc_object(clazz, CHECK_NULL);
1132 obj = JNIHandles::make_local(env, i);
1133 JavaValue jvalue(T_VOID);
1134 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1135 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1136 return obj;
1137 JNI_END
1139 DT_RETURN_MARK_DECL(NewObjectV, jobject);
1141 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
1142 JNIWrapper("NewObjectV");
1143 DTRACE_PROBE3(hotspot_jni, NewObjectV__entry, env, clazz, methodID);
1144 jobject obj = NULL;
1145 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
1147 instanceOop i = alloc_object(clazz, CHECK_NULL);
1148 obj = JNIHandles::make_local(env, i);
1149 JavaValue jvalue(T_VOID);
1150 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1151 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1152 return obj;
1153 JNI_END
1155 DT_RETURN_MARK_DECL(NewObject, jobject);
1157 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1158 JNIWrapper("NewObject");
1159 DTRACE_PROBE3(hotspot_jni, NewObject__entry, env, clazz, methodID);
1160 jobject obj = NULL;
1161 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1163 instanceOop i = alloc_object(clazz, CHECK_NULL);
1164 obj = JNIHandles::make_local(env, i);
1165 va_list args;
1166 va_start(args, methodID);
1167 JavaValue jvalue(T_VOID);
1168 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1169 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1170 va_end(args);
1171 return obj;
1172 JNI_END
1175 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1176 JNIWrapper("GetObjectClass");
1177 DTRACE_PROBE2(hotspot_jni, GetObjectClass__entry, env, obj);
1178 klassOop k = JNIHandles::resolve_non_null(obj)->klass();
1179 jclass ret =
1180 (jclass) JNIHandles::make_local(env, Klass::cast(k)->java_mirror());
1181 DTRACE_PROBE1(hotspot_jni, GetObjectClass__return, ret);
1182 return ret;
1183 JNI_END
1185 JNI_QUICK_ENTRY(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1186 JNIWrapper("IsInstanceOf");
1187 DTRACE_PROBE3(hotspot_jni, IsInstanceOf__entry, env, obj, clazz);
1188 jboolean ret = JNI_TRUE;
1189 if (obj != NULL) {
1190 ret = JNI_FALSE;
1191 klassOop k = java_lang_Class::as_klassOop(
1192 JNIHandles::resolve_non_null(clazz));
1193 if (k != NULL) {
1194 ret = JNIHandles::resolve_non_null(obj)->is_a(k) ? JNI_TRUE : JNI_FALSE;
1195 }
1196 }
1197 DTRACE_PROBE1(hotspot_jni, IsInstanceOf__return, ret);
1198 return ret;
1199 JNI_END
1202 static jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name_str,
1203 const char *sig, bool is_static, TRAPS) {
1204 // %%%% This code should probably just call into a method in the LinkResolver
1205 //
1206 // The class should have been loaded (we have an instance of the class
1207 // passed in) so the method and signature should already be in the symbol
1208 // table. If they're not there, the method doesn't exist.
1209 symbolHandle signature =
1210 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1211 symbolHandle name;
1212 if (name_str == NULL) {
1213 name = vmSymbolHandles::object_initializer_name();
1214 } else {
1215 name = symbolHandle(THREAD,
1216 SymbolTable::probe(name_str, (int)strlen(name_str)));
1217 }
1218 if (name.is_null() || signature.is_null()) {
1219 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1220 }
1222 // Throw a NoSuchMethodError exception if we have an instance of a
1223 // primitive java.lang.Class
1224 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(clazz))) {
1225 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1226 }
1228 KlassHandle klass(THREAD,
1229 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1231 // Make sure class is linked and initialized before handing id's out to
1232 // methodOops.
1233 Klass::cast(klass())->initialize(CHECK_NULL);
1235 methodOop m;
1236 if (name() == vmSymbols::object_initializer_name() ||
1237 name() == vmSymbols::class_initializer_name()) {
1238 // Never search superclasses for constructors
1239 if (klass->oop_is_instance()) {
1240 m = instanceKlass::cast(klass())->find_method(name(), signature());
1241 } else {
1242 m = NULL;
1243 }
1244 } else {
1245 m = klass->lookup_method(name(), signature());
1246 // Look up interfaces
1247 if (m == NULL && klass->oop_is_instance()) {
1248 m = instanceKlass::cast(klass())->lookup_method_in_all_interfaces(name(),
1249 signature());
1250 }
1251 }
1252 if (m == NULL || (m->is_static() != is_static)) {
1253 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1254 }
1255 return m->jmethod_id();
1256 }
1259 JNI_ENTRY(jmethodID, jni_GetMethodID(JNIEnv *env, jclass clazz,
1260 const char *name, const char *sig))
1261 JNIWrapper("GetMethodID");
1262 DTRACE_PROBE4(hotspot_jni, GetMethodID__entry, env, clazz, name, sig);
1263 jmethodID ret = get_method_id(env, clazz, name, sig, false, thread);
1264 DTRACE_PROBE1(hotspot_jni, GetMethodID__return, ret);
1265 return ret;
1266 JNI_END
1269 JNI_ENTRY(jmethodID, jni_GetStaticMethodID(JNIEnv *env, jclass clazz,
1270 const char *name, const char *sig))
1271 JNIWrapper("GetStaticMethodID");
1272 DTRACE_PROBE4(hotspot_jni, GetStaticMethodID__entry, env, clazz, name, sig);
1273 jmethodID ret = get_method_id(env, clazz, name, sig, true, thread);
1274 DTRACE_PROBE1(hotspot_jni, GetStaticMethodID__return, ret);
1275 return ret;
1276 JNI_END
1280 //
1281 // Calling Methods
1282 //
1285 #define DEFINE_CALLMETHOD(ResultType, Result, Tag) \
1286 \
1287 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##Method, ResultType);\
1288 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodV, ResultType);\
1289 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodA, ResultType);\
1290 \
1291 JNI_ENTRY(ResultType, \
1292 jni_Call##Result##Method(JNIEnv *env, jobject obj, jmethodID methodID, ...)) \
1293 JNIWrapper("Call" XSTR(Result) "Method"); \
1294 \
1295 DTRACE_PROBE3(hotspot_jni, Call##Result##Method__entry, env, obj, methodID);\
1296 ResultType ret = 0;\
1297 DT_RETURN_MARK_FOR(Result, Call##Result##Method, ResultType, \
1298 (const ResultType&)ret);\
1299 \
1300 va_list args; \
1301 va_start(args, methodID); \
1302 JavaValue jvalue(Tag); \
1303 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1304 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1305 va_end(args); \
1306 ret = jvalue.get_##ResultType(); \
1307 return ret;\
1308 JNI_END \
1309 \
1310 \
1311 JNI_ENTRY(ResultType, \
1312 jni_Call##Result##MethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) \
1313 JNIWrapper("Call" XSTR(Result) "MethodV"); \
1314 \
1315 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodV__entry, env, obj, methodID);\
1316 ResultType ret = 0;\
1317 DT_RETURN_MARK_FOR(Result, Call##Result##MethodV, ResultType, \
1318 (const ResultType&)ret);\
1319 \
1320 JavaValue jvalue(Tag); \
1321 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1322 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1323 ret = jvalue.get_##ResultType(); \
1324 return ret;\
1325 JNI_END \
1326 \
1327 \
1328 JNI_ENTRY(ResultType, \
1329 jni_Call##Result##MethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) \
1330 JNIWrapper("Call" XSTR(Result) "MethodA"); \
1331 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodA__entry, env, obj, methodID);\
1332 ResultType ret = 0;\
1333 DT_RETURN_MARK_FOR(Result, Call##Result##MethodA, ResultType, \
1334 (const ResultType&)ret);\
1335 \
1336 JavaValue jvalue(Tag); \
1337 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1338 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1339 ret = jvalue.get_##ResultType(); \
1340 return ret;\
1341 JNI_END
1343 // the runtime type of subword integral basic types is integer
1344 DEFINE_CALLMETHOD(jboolean, Boolean, T_BOOLEAN)
1345 DEFINE_CALLMETHOD(jbyte, Byte, T_BYTE)
1346 DEFINE_CALLMETHOD(jchar, Char, T_CHAR)
1347 DEFINE_CALLMETHOD(jshort, Short, T_SHORT)
1349 DEFINE_CALLMETHOD(jobject, Object, T_OBJECT)
1350 DEFINE_CALLMETHOD(jint, Int, T_INT)
1351 DEFINE_CALLMETHOD(jlong, Long, T_LONG)
1352 DEFINE_CALLMETHOD(jfloat, Float, T_FLOAT)
1353 DEFINE_CALLMETHOD(jdouble, Double, T_DOUBLE)
1355 DT_VOID_RETURN_MARK_DECL(CallVoidMethod);
1356 DT_VOID_RETURN_MARK_DECL(CallVoidMethodV);
1357 DT_VOID_RETURN_MARK_DECL(CallVoidMethodA);
1359 JNI_ENTRY(void, jni_CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...))
1360 JNIWrapper("CallVoidMethod");
1361 DTRACE_PROBE3(hotspot_jni, CallVoidMethod__entry, env, obj, methodID);
1362 DT_VOID_RETURN_MARK(CallVoidMethod);
1364 va_list args;
1365 va_start(args, methodID);
1366 JavaValue jvalue(T_VOID);
1367 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1368 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1369 va_end(args);
1370 JNI_END
1373 JNI_ENTRY(void, jni_CallVoidMethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args))
1374 JNIWrapper("CallVoidMethodV");
1375 DTRACE_PROBE3(hotspot_jni, CallVoidMethodV__entry, env, obj, methodID);
1376 DT_VOID_RETURN_MARK(CallVoidMethodV);
1378 JavaValue jvalue(T_VOID);
1379 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1380 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1381 JNI_END
1384 JNI_ENTRY(void, jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args))
1385 JNIWrapper("CallVoidMethodA");
1386 DTRACE_PROBE3(hotspot_jni, CallVoidMethodA__entry, env, obj, methodID);
1387 DT_VOID_RETURN_MARK(CallVoidMethodA);
1389 JavaValue jvalue(T_VOID);
1390 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1391 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1392 JNI_END
1395 #define DEFINE_CALLNONVIRTUALMETHOD(ResultType, Result, Tag) \
1396 \
1397 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##Method, ResultType);\
1398 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodV, ResultType);\
1399 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodA, ResultType);\
1400 \
1401 JNI_ENTRY(ResultType, \
1402 jni_CallNonvirtual##Result##Method(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) \
1403 JNIWrapper("CallNonvitual" XSTR(Result) "Method"); \
1404 \
1405 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##Method__entry, env, obj, cls, methodID);\
1406 ResultType ret;\
1407 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##Method, ResultType, \
1408 (const ResultType&)ret);\
1409 \
1410 va_list args; \
1411 va_start(args, methodID); \
1412 JavaValue jvalue(Tag); \
1413 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1414 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1415 va_end(args); \
1416 ret = jvalue.get_##ResultType(); \
1417 return ret;\
1418 JNI_END \
1419 \
1420 JNI_ENTRY(ResultType, \
1421 jni_CallNonvirtual##Result##MethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) \
1422 JNIWrapper("CallNonvitual" XSTR(Result) "#MethodV"); \
1423 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodV__entry, env, obj, cls, methodID);\
1424 ResultType ret;\
1425 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodV, ResultType, \
1426 (const ResultType&)ret);\
1427 \
1428 JavaValue jvalue(Tag); \
1429 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1430 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1431 ret = jvalue.get_##ResultType(); \
1432 return ret;\
1433 JNI_END \
1434 \
1435 JNI_ENTRY(ResultType, \
1436 jni_CallNonvirtual##Result##MethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) \
1437 JNIWrapper("CallNonvitual" XSTR(Result) "MethodA"); \
1438 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodA__entry, env, obj, cls, methodID);\
1439 ResultType ret;\
1440 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodA, ResultType, \
1441 (const ResultType&)ret);\
1442 \
1443 JavaValue jvalue(Tag); \
1444 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1445 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1446 ret = jvalue.get_##ResultType(); \
1447 return ret;\
1448 JNI_END
1450 // the runtime type of subword integral basic types is integer
1451 DEFINE_CALLNONVIRTUALMETHOD(jboolean, Boolean, T_BOOLEAN)
1452 DEFINE_CALLNONVIRTUALMETHOD(jbyte, Byte, T_BYTE)
1453 DEFINE_CALLNONVIRTUALMETHOD(jchar, Char, T_CHAR)
1454 DEFINE_CALLNONVIRTUALMETHOD(jshort, Short, T_SHORT)
1456 DEFINE_CALLNONVIRTUALMETHOD(jobject, Object, T_OBJECT)
1457 DEFINE_CALLNONVIRTUALMETHOD(jint, Int, T_INT)
1458 DEFINE_CALLNONVIRTUALMETHOD(jlong, Long, T_LONG)
1459 DEFINE_CALLNONVIRTUALMETHOD(jfloat, Float, T_FLOAT)
1460 DEFINE_CALLNONVIRTUALMETHOD(jdouble, Double, T_DOUBLE)
1463 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethod);
1464 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodV);
1465 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodA);
1467 JNI_ENTRY(void, jni_CallNonvirtualVoidMethod(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...))
1468 JNIWrapper("CallNonvirtualVoidMethod");
1470 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethod__entry,
1471 env, obj, cls, methodID);
1472 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethod);
1474 va_list args;
1475 va_start(args, methodID);
1476 JavaValue jvalue(T_VOID);
1477 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1478 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1479 va_end(args);
1480 JNI_END
1483 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args))
1484 JNIWrapper("CallNonvirtualVoidMethodV");
1486 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodV__entry,
1487 env, obj, cls, methodID);
1488 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodV);
1490 JavaValue jvalue(T_VOID);
1491 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1492 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1493 JNI_END
1496 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args))
1497 JNIWrapper("CallNonvirtualVoidMethodA");
1498 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodA__entry,
1499 env, obj, cls, methodID);
1500 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodA);
1501 JavaValue jvalue(T_VOID);
1502 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1503 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1504 JNI_END
1507 #define DEFINE_CALLSTATICMETHOD(ResultType, Result, Tag) \
1508 \
1509 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##Method, ResultType);\
1510 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodV, ResultType);\
1511 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodA, ResultType);\
1512 \
1513 JNI_ENTRY(ResultType, \
1514 jni_CallStatic##Result##Method(JNIEnv *env, jclass cls, jmethodID methodID, ...)) \
1515 JNIWrapper("CallStatic" XSTR(Result) "Method"); \
1516 \
1517 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##Method__entry, env, cls, methodID);\
1518 ResultType ret = 0;\
1519 DT_RETURN_MARK_FOR(Result, CallStatic##Result##Method, ResultType, \
1520 (const ResultType&)ret);\
1521 \
1522 va_list args; \
1523 va_start(args, methodID); \
1524 JavaValue jvalue(Tag); \
1525 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1526 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1527 va_end(args); \
1528 ret = jvalue.get_##ResultType(); \
1529 return ret;\
1530 JNI_END \
1531 \
1532 JNI_ENTRY(ResultType, \
1533 jni_CallStatic##Result##MethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) \
1534 JNIWrapper("CallStatic" XSTR(Result) "MethodV"); \
1535 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodV__entry, env, cls, methodID);\
1536 ResultType ret = 0;\
1537 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodV, ResultType, \
1538 (const ResultType&)ret);\
1539 \
1540 JavaValue jvalue(Tag); \
1541 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args); \
1542 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1543 ret = jvalue.get_##ResultType(); \
1544 return ret;\
1545 JNI_END \
1546 \
1547 JNI_ENTRY(ResultType, \
1548 jni_CallStatic##Result##MethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) \
1549 JNIWrapper("CallStatic" XSTR(Result) "MethodA"); \
1550 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodA__entry, env, cls, methodID);\
1551 ResultType ret = 0;\
1552 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodA, ResultType, \
1553 (const ResultType&)ret);\
1554 \
1555 JavaValue jvalue(Tag); \
1556 JNI_ArgumentPusherArray ap(THREAD, methodID, args); \
1557 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1558 ret = jvalue.get_##ResultType(); \
1559 return ret;\
1560 JNI_END
1562 // the runtime type of subword integral basic types is integer
1563 DEFINE_CALLSTATICMETHOD(jboolean, Boolean, T_BOOLEAN)
1564 DEFINE_CALLSTATICMETHOD(jbyte, Byte, T_BYTE)
1565 DEFINE_CALLSTATICMETHOD(jchar, Char, T_CHAR)
1566 DEFINE_CALLSTATICMETHOD(jshort, Short, T_SHORT)
1568 DEFINE_CALLSTATICMETHOD(jobject, Object, T_OBJECT)
1569 DEFINE_CALLSTATICMETHOD(jint, Int, T_INT)
1570 DEFINE_CALLSTATICMETHOD(jlong, Long, T_LONG)
1571 DEFINE_CALLSTATICMETHOD(jfloat, Float, T_FLOAT)
1572 DEFINE_CALLSTATICMETHOD(jdouble, Double, T_DOUBLE)
1575 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethod);
1576 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodV);
1577 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodA);
1579 JNI_ENTRY(void, jni_CallStaticVoidMethod(JNIEnv *env, jclass cls, jmethodID methodID, ...))
1580 JNIWrapper("CallStaticVoidMethod");
1581 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethod__entry, env, cls, methodID);
1582 DT_VOID_RETURN_MARK(CallStaticVoidMethod);
1584 va_list args;
1585 va_start(args, methodID);
1586 JavaValue jvalue(T_VOID);
1587 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1588 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1589 va_end(args);
1590 JNI_END
1593 JNI_ENTRY(void, jni_CallStaticVoidMethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args))
1594 JNIWrapper("CallStaticVoidMethodV");
1595 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodV__entry, env, cls, methodID);
1596 DT_VOID_RETURN_MARK(CallStaticVoidMethodV);
1598 JavaValue jvalue(T_VOID);
1599 JNI_ArgumentPusherVaArg ap(THREAD, methodID, args);
1600 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1601 JNI_END
1604 JNI_ENTRY(void, jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args))
1605 JNIWrapper("CallStaticVoidMethodA");
1606 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodA__entry, env, cls, methodID);
1607 DT_VOID_RETURN_MARK(CallStaticVoidMethodA);
1609 JavaValue jvalue(T_VOID);
1610 JNI_ArgumentPusherArray ap(THREAD, methodID, args);
1611 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1612 JNI_END
1615 //
1616 // Accessing Fields
1617 //
1620 DT_RETURN_MARK_DECL(GetFieldID, jfieldID);
1622 JNI_ENTRY(jfieldID, jni_GetFieldID(JNIEnv *env, jclass clazz,
1623 const char *name, const char *sig))
1624 JNIWrapper("GetFieldID");
1625 DTRACE_PROBE4(hotspot_jni, GetFieldID__entry, env, clazz, name, sig);
1626 jfieldID ret = 0;
1627 DT_RETURN_MARK(GetFieldID, jfieldID, (const jfieldID&)ret);
1629 // The class should have been loaded (we have an instance of the class
1630 // passed in) so the field and signature should already be in the symbol
1631 // table. If they're not there, the field doesn't exist.
1632 symbolHandle fieldname =
1633 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
1634 symbolHandle signame =
1635 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1636 if (fieldname.is_null() || signame.is_null()) {
1637 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1638 }
1639 KlassHandle k(THREAD,
1640 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1641 // Make sure class is initialized before handing id's out to fields
1642 Klass::cast(k())->initialize(CHECK_NULL);
1644 fieldDescriptor fd;
1645 if (!Klass::cast(k())->oop_is_instance() ||
1646 !instanceKlass::cast(k())->find_field(fieldname(), signame(), false, &fd)) {
1647 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1648 }
1650 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1651 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1652 ret = jfieldIDWorkaround::to_instance_jfieldID(k(), fd.offset());
1653 return ret;
1654 JNI_END
1657 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1658 JNIWrapper("GetObjectField");
1659 DTRACE_PROBE3(hotspot_jni, GetObjectField__entry, env, obj, fieldID);
1660 oop o = JNIHandles::resolve_non_null(obj);
1661 klassOop k = o->klass();
1662 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1663 // Keep JVMTI addition small and only check enabled flag here.
1664 // jni_GetField_probe() assumes that is okay to create handles.
1665 if (JvmtiExport::should_post_field_access()) {
1666 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1667 }
1668 jobject ret = JNIHandles::make_local(env, o->obj_field(offset));
1669 DTRACE_PROBE1(hotspot_jni, GetObjectField__return, ret);
1670 return ret;
1671 JNI_END
1674 #define DEFINE_GETFIELD(Return,Fieldname,Result) \
1675 \
1676 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return);\
1677 \
1678 JNI_QUICK_ENTRY(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1679 JNIWrapper("Get" XSTR(Result) "Field"); \
1680 \
1681 DTRACE_PROBE3(hotspot_jni, Get##Result##Field__entry, env, obj, fieldID);\
1682 Return ret = 0;\
1683 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1684 \
1685 oop o = JNIHandles::resolve_non_null(obj); \
1686 klassOop k = o->klass(); \
1687 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1688 /* Keep JVMTI addition small and only check enabled flag here. */ \
1689 /* jni_GetField_probe_nh() assumes that is not okay to create handles */ \
1690 /* and creates a ResetNoHandleMark. */ \
1691 if (JvmtiExport::should_post_field_access()) { \
1692 o = JvmtiExport::jni_GetField_probe_nh(thread, obj, o, k, fieldID, false); \
1693 } \
1694 ret = o->Fieldname##_field(offset); \
1695 return ret; \
1696 JNI_END
1698 DEFINE_GETFIELD(jboolean, bool, Boolean)
1699 DEFINE_GETFIELD(jbyte, byte, Byte)
1700 DEFINE_GETFIELD(jchar, char, Char)
1701 DEFINE_GETFIELD(jshort, short, Short)
1702 DEFINE_GETFIELD(jint, int, Int)
1703 DEFINE_GETFIELD(jlong, long, Long)
1704 DEFINE_GETFIELD(jfloat, float, Float)
1705 DEFINE_GETFIELD(jdouble, double, Double)
1707 address jni_GetBooleanField_addr() {
1708 return (address)jni_GetBooleanField;
1709 }
1710 address jni_GetByteField_addr() {
1711 return (address)jni_GetByteField;
1712 }
1713 address jni_GetCharField_addr() {
1714 return (address)jni_GetCharField;
1715 }
1716 address jni_GetShortField_addr() {
1717 return (address)jni_GetShortField;
1718 }
1719 address jni_GetIntField_addr() {
1720 return (address)jni_GetIntField;
1721 }
1722 address jni_GetLongField_addr() {
1723 return (address)jni_GetLongField;
1724 }
1725 address jni_GetFloatField_addr() {
1726 return (address)jni_GetFloatField;
1727 }
1728 address jni_GetDoubleField_addr() {
1729 return (address)jni_GetDoubleField;
1730 }
1732 JNI_QUICK_ENTRY(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1733 JNIWrapper("SetObjectField");
1734 DTRACE_PROBE4(hotspot_jni, SetObjectField__entry, env, obj, fieldID, value);
1735 oop o = JNIHandles::resolve_non_null(obj);
1736 klassOop k = o->klass();
1737 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1738 // Keep JVMTI addition small and only check enabled flag here.
1739 // jni_SetField_probe_nh() assumes that is not okay to create handles
1740 // and creates a ResetNoHandleMark.
1741 if (JvmtiExport::should_post_field_modification()) {
1742 jvalue field_value;
1743 field_value.l = value;
1744 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, 'L', (jvalue *)&field_value);
1745 }
1746 o->obj_field_put(offset, JNIHandles::resolve(value));
1747 DTRACE_PROBE(hotspot_jni, SetObjectField__return);
1748 JNI_END
1750 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType) \
1751 \
1752 JNI_QUICK_ENTRY(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1753 JNIWrapper("Set" XSTR(Result) "Field"); \
1754 \
1755 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, Set##Result##Field__entry, \
1756 ( JNIEnv*, jobject, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1757 HS_DTRACE_PROBE_N(hotspot_jni, Set##Result##Field__entry, \
1758 ( env, obj, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1759 \
1760 oop o = JNIHandles::resolve_non_null(obj); \
1761 klassOop k = o->klass(); \
1762 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1763 /* Keep JVMTI addition small and only check enabled flag here. */ \
1764 /* jni_SetField_probe_nh() assumes that is not okay to create handles */ \
1765 /* and creates a ResetNoHandleMark. */ \
1766 if (JvmtiExport::should_post_field_modification()) { \
1767 jvalue field_value; \
1768 field_value.unionType = value; \
1769 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \
1770 } \
1771 o->Fieldname##_field_put(offset, value); \
1772 DTRACE_PROBE(hotspot_jni, Set##Result##Field__return);\
1773 JNI_END
1775 DEFINE_SETFIELD(jboolean, bool, Boolean, 'Z', z)
1776 DEFINE_SETFIELD(jbyte, byte, Byte, 'B', b)
1777 DEFINE_SETFIELD(jchar, char, Char, 'C', c)
1778 DEFINE_SETFIELD(jshort, short, Short, 'S', s)
1779 DEFINE_SETFIELD(jint, int, Int, 'I', i)
1780 DEFINE_SETFIELD(jlong, long, Long, 'J', j)
1781 DEFINE_SETFIELD(jfloat, float, Float, 'F', f)
1782 DEFINE_SETFIELD(jdouble, double, Double, 'D', d)
1784 DT_RETURN_MARK_DECL(ToReflectedField, jobject);
1786 JNI_ENTRY(jobject, jni_ToReflectedField(JNIEnv *env, jclass cls, jfieldID fieldID, jboolean isStatic))
1787 JNIWrapper("ToReflectedField");
1788 DTRACE_PROBE4(hotspot_jni, ToReflectedField__entry,
1789 env, cls, fieldID, isStatic);
1790 jobject ret = NULL;
1791 DT_RETURN_MARK(ToReflectedField, jobject, (const jobject&)ret);
1793 fieldDescriptor fd;
1794 bool found = false;
1795 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(cls));
1797 assert(jfieldIDWorkaround::is_static_jfieldID(fieldID) == (isStatic != 0), "invalid fieldID");
1799 if (isStatic) {
1800 // Static field. The fieldID a JNIid specifying the field holder and the offset within the klassOop.
1801 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1802 assert(id->is_static_field_id(), "invalid static field id");
1803 found = instanceKlass::cast(id->holder())->find_local_field_from_offset(id->offset(), true, &fd);
1804 } else {
1805 // Non-static field. The fieldID is really the offset of the field within the instanceOop.
1806 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1807 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, &fd);
1808 }
1809 assert(found, "bad fieldID passed into jni_ToReflectedField");
1810 oop reflected = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
1811 ret = JNIHandles::make_local(env, reflected);
1812 return ret;
1813 JNI_END
1816 //
1817 // Accessing Static Fields
1818 //
1819 DT_RETURN_MARK_DECL(GetStaticFieldID, jfieldID);
1821 JNI_ENTRY(jfieldID, jni_GetStaticFieldID(JNIEnv *env, jclass clazz,
1822 const char *name, const char *sig))
1823 JNIWrapper("GetStaticFieldID");
1824 DTRACE_PROBE4(hotspot_jni, GetStaticFieldID__entry, env, clazz, name, sig);
1825 jfieldID ret = NULL;
1826 DT_RETURN_MARK(GetStaticFieldID, jfieldID, (const jfieldID&)ret);
1828 // The class should have been loaded (we have an instance of the class
1829 // passed in) so the field and signature should already be in the symbol
1830 // table. If they're not there, the field doesn't exist.
1831 symbolHandle fieldname =
1832 symbolHandle(THREAD, SymbolTable::probe(name, (int)strlen(name)));
1833 symbolHandle signame =
1834 symbolHandle(THREAD, SymbolTable::probe(sig, (int)strlen(sig)));
1835 if (fieldname.is_null() || signame.is_null()) {
1836 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1837 }
1838 KlassHandle k(THREAD,
1839 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1840 // Make sure class is initialized before handing id's out to static fields
1841 Klass::cast(k())->initialize(CHECK_NULL);
1843 fieldDescriptor fd;
1844 if (!Klass::cast(k())->oop_is_instance() ||
1845 !instanceKlass::cast(k())->find_field(fieldname(), signame(), true, &fd)) {
1846 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1847 }
1849 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
1850 JNIid* id = instanceKlass::cast(fd.field_holder())->jni_id_for(fd.offset());
1851 debug_only(id->set_is_static_field_id();)
1853 debug_only(int first_offset = instanceKlass::cast(fd.field_holder())->offset_of_static_fields();)
1854 debug_only(int end_offset = first_offset + (instanceKlass::cast(fd.field_holder())->static_field_size() * wordSize);)
1855 assert(id->offset() >= first_offset && id->offset() < end_offset, "invalid static field offset");
1857 ret = jfieldIDWorkaround::to_static_jfieldID(id);
1858 return ret;
1859 JNI_END
1862 JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID))
1863 JNIWrapper("GetStaticObjectField");
1864 DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID);
1865 #ifndef JNICHECK_KERNEL
1866 DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);)
1867 #endif // JNICHECK_KERNEL
1868 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1869 assert(id->is_static_field_id(), "invalid static field id");
1870 // Keep JVMTI addition small and only check enabled flag here.
1871 // jni_GetField_probe() assumes that is okay to create handles.
1872 if (JvmtiExport::should_post_field_access()) {
1873 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true);
1874 }
1875 jobject ret = JNIHandles::make_local(id->holder()->obj_field(id->offset()));
1876 DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret);
1877 return ret;
1878 JNI_END
1880 #define DEFINE_GETSTATICFIELD(Return,Fieldname,Result) \
1881 \
1882 DT_RETURN_MARK_DECL_FOR(Result, GetStatic##Result##Field, Return);\
1883 \
1884 JNI_ENTRY(Return, jni_GetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID)) \
1885 JNIWrapper("GetStatic" XSTR(Result) "Field"); \
1886 DTRACE_PROBE3(hotspot_jni, GetStatic##Result##Field__entry, env, clazz, fieldID);\
1887 Return ret = 0;\
1888 DT_RETURN_MARK_FOR(Result, GetStatic##Result##Field, Return, \
1889 (const Return&)ret);\
1890 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1891 assert(id->is_static_field_id(), "invalid static field id"); \
1892 /* Keep JVMTI addition small and only check enabled flag here. */ \
1893 /* jni_GetField_probe() assumes that is okay to create handles. */ \
1894 if (JvmtiExport::should_post_field_access()) { \
1895 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); \
1896 } \
1897 ret = id->holder()-> Fieldname##_field (id->offset()); \
1898 return ret;\
1899 JNI_END
1901 DEFINE_GETSTATICFIELD(jboolean, bool, Boolean)
1902 DEFINE_GETSTATICFIELD(jbyte, byte, Byte)
1903 DEFINE_GETSTATICFIELD(jchar, char, Char)
1904 DEFINE_GETSTATICFIELD(jshort, short, Short)
1905 DEFINE_GETSTATICFIELD(jint, int, Int)
1906 DEFINE_GETSTATICFIELD(jlong, long, Long)
1907 DEFINE_GETSTATICFIELD(jfloat, float, Float)
1908 DEFINE_GETSTATICFIELD(jdouble, double, Double)
1911 JNI_ENTRY(void, jni_SetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID, jobject value))
1912 JNIWrapper("SetStaticObjectField");
1913 DTRACE_PROBE4(hotspot_jni, SetStaticObjectField__entry, env, clazz, fieldID, value);
1914 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1915 assert(id->is_static_field_id(), "invalid static field id");
1916 // Keep JVMTI addition small and only check enabled flag here.
1917 // jni_SetField_probe() assumes that is okay to create handles.
1918 if (JvmtiExport::should_post_field_modification()) {
1919 jvalue field_value;
1920 field_value.l = value;
1921 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, 'L', (jvalue *)&field_value);
1922 }
1923 id->holder()->obj_field_put(id->offset(), JNIHandles::resolve(value));
1924 DTRACE_PROBE(hotspot_jni, SetStaticObjectField__return);
1925 JNI_END
1928 #define DEFINE_SETSTATICFIELD(Argument,Fieldname,Result,SigType,unionType) \
1929 \
1930 JNI_ENTRY(void, jni_SetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID, Argument value)) \
1931 JNIWrapper("SetStatic" XSTR(Result) "Field"); \
1932 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, SetStatic##Result##Field__entry,\
1933 ( JNIEnv*, jclass, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1934 HS_DTRACE_PROBE_N(hotspot_jni, SetStatic##Result##Field__entry, \
1935 ( env, clazz, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1936 \
1937 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1938 assert(id->is_static_field_id(), "invalid static field id"); \
1939 /* Keep JVMTI addition small and only check enabled flag here. */ \
1940 /* jni_SetField_probe() assumes that is okay to create handles. */ \
1941 if (JvmtiExport::should_post_field_modification()) { \
1942 jvalue field_value; \
1943 field_value.unionType = value; \
1944 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, SigType, (jvalue *)&field_value); \
1945 } \
1946 id->holder()-> Fieldname##_field_put (id->offset(), value); \
1947 DTRACE_PROBE(hotspot_jni, SetStatic##Result##Field__return);\
1948 JNI_END
1950 DEFINE_SETSTATICFIELD(jboolean, bool, Boolean, 'Z', z)
1951 DEFINE_SETSTATICFIELD(jbyte, byte, Byte, 'B', b)
1952 DEFINE_SETSTATICFIELD(jchar, char, Char, 'C', c)
1953 DEFINE_SETSTATICFIELD(jshort, short, Short, 'S', s)
1954 DEFINE_SETSTATICFIELD(jint, int, Int, 'I', i)
1955 DEFINE_SETSTATICFIELD(jlong, long, Long, 'J', j)
1956 DEFINE_SETSTATICFIELD(jfloat, float, Float, 'F', f)
1957 DEFINE_SETSTATICFIELD(jdouble, double, Double, 'D', d)
1960 //
1961 // String Operations
1962 //
1964 // Unicode Interface
1966 DT_RETURN_MARK_DECL(NewString, jstring);
1968 JNI_ENTRY(jstring, jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len))
1969 JNIWrapper("NewString");
1970 DTRACE_PROBE3(hotspot_jni, NewString__entry, env, unicodeChars, len);
1971 jstring ret = NULL;
1972 DT_RETURN_MARK(NewString, jstring, (const jstring&)ret);
1973 oop string=java_lang_String::create_oop_from_unicode((jchar*) unicodeChars, len, CHECK_NULL);
1974 ret = (jstring) JNIHandles::make_local(env, string);
1975 return ret;
1976 JNI_END
1979 JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string))
1980 JNIWrapper("GetStringLength");
1981 DTRACE_PROBE2(hotspot_jni, GetStringLength__entry, env, string);
1982 jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string));
1983 DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret);
1984 return ret;
1985 JNI_END
1988 JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars(
1989 JNIEnv *env, jstring string, jboolean *isCopy))
1990 JNIWrapper("GetStringChars");
1991 DTRACE_PROBE3(hotspot_jni, GetStringChars__entry, env, string, isCopy);
1992 //%note jni_5
1993 if (isCopy != NULL) {
1994 *isCopy = JNI_TRUE;
1995 }
1996 oop s = JNIHandles::resolve_non_null(string);
1997 int s_len = java_lang_String::length(s);
1998 typeArrayOop s_value = java_lang_String::value(s);
1999 int s_offset = java_lang_String::offset(s);
2000 jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1); // add one for zero termination
2001 if (s_len > 0) {
2002 memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len);
2003 }
2004 buf[s_len] = 0;
2005 DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf);
2006 return buf;
2007 JNI_END
2010 JNI_QUICK_ENTRY(void, jni_ReleaseStringChars(JNIEnv *env, jstring str, const jchar *chars))
2011 JNIWrapper("ReleaseStringChars");
2012 DTRACE_PROBE3(hotspot_jni, ReleaseStringChars__entry, env, str, chars);
2013 //%note jni_6
2014 if (chars != NULL) {
2015 // Since String objects are supposed to be immutable, don't copy any
2016 // new data back. A bad user will have to go after the char array.
2017 FreeHeap((void*) chars);
2018 }
2019 DTRACE_PROBE(hotspot_jni, ReleaseStringChars__return);
2020 JNI_END
2023 // UTF Interface
2025 DT_RETURN_MARK_DECL(NewStringUTF, jstring);
2027 JNI_ENTRY(jstring, jni_NewStringUTF(JNIEnv *env, const char *bytes))
2028 JNIWrapper("NewStringUTF");
2029 DTRACE_PROBE2(hotspot_jni, NewStringUTF__entry, env, bytes);
2030 jstring ret;
2031 DT_RETURN_MARK(NewStringUTF, jstring, (const jstring&)ret);
2033 oop result = java_lang_String::create_oop_from_str((char*) bytes, CHECK_NULL);
2034 ret = (jstring) JNIHandles::make_local(env, result);
2035 return ret;
2036 JNI_END
2039 JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string))
2040 JNIWrapper("GetStringUTFLength");
2041 DTRACE_PROBE2(hotspot_jni, GetStringUTFLength__entry, env, string);
2042 jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string));
2043 DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret);
2044 return ret;
2045 JNI_END
2048 JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboolean *isCopy))
2049 JNIWrapper("GetStringUTFChars");
2050 DTRACE_PROBE3(hotspot_jni, GetStringUTFChars__entry, env, string, isCopy);
2051 ResourceMark rm;
2052 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(string));
2053 int length = (int)strlen(str);
2054 char* result = AllocateHeap(length+1, "GetStringUTFChars");
2055 strcpy(result, str);
2056 if (isCopy != NULL) *isCopy = JNI_TRUE;
2057 DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result);
2058 return result;
2059 JNI_END
2062 JNI_LEAF(void, jni_ReleaseStringUTFChars(JNIEnv *env, jstring str, const char *chars))
2063 JNIWrapper("ReleaseStringUTFChars");
2064 DTRACE_PROBE3(hotspot_jni, ReleaseStringUTFChars__entry, env, str, chars);
2065 if (chars != NULL) {
2066 FreeHeap((char*) chars);
2067 }
2068 DTRACE_PROBE(hotspot_jni, ReleaseStringUTFChars__return);
2069 JNI_END
2072 JNI_QUICK_ENTRY(jsize, jni_GetArrayLength(JNIEnv *env, jarray array))
2073 JNIWrapper("GetArrayLength");
2074 DTRACE_PROBE2(hotspot_jni, GetArrayLength__entry, env, array);
2075 arrayOop a = arrayOop(JNIHandles::resolve_non_null(array));
2076 assert(a->is_array(), "must be array");
2077 jsize ret = a->length();
2078 DTRACE_PROBE1(hotspot_jni, GetArrayLength__return, ret);
2079 return ret;
2080 JNI_END
2083 //
2084 // Object Array Operations
2085 //
2087 DT_RETURN_MARK_DECL(NewObjectArray, jobjectArray);
2089 JNI_ENTRY(jobjectArray, jni_NewObjectArray(JNIEnv *env, jsize length, jclass elementClass, jobject initialElement))
2090 JNIWrapper("NewObjectArray");
2091 DTRACE_PROBE4(hotspot_jni, NewObjectArray__entry, env, length, elementClass, initialElement);
2092 jobjectArray ret = NULL;
2093 DT_RETURN_MARK(NewObjectArray, jobjectArray, (const jobjectArray&)ret);
2094 KlassHandle ek(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(elementClass)));
2095 klassOop ako = Klass::cast(ek())->array_klass(CHECK_NULL);
2096 KlassHandle ak = KlassHandle(THREAD, ako);
2097 objArrayKlass::cast(ak())->initialize(CHECK_NULL);
2098 objArrayOop result = objArrayKlass::cast(ak())->allocate(length, CHECK_NULL);
2099 oop initial_value = JNIHandles::resolve(initialElement);
2100 if (initial_value != NULL) { // array already initialized with NULL
2101 for (int index = 0; index < length; index++) {
2102 result->obj_at_put(index, initial_value);
2103 }
2104 }
2105 ret = (jobjectArray) JNIHandles::make_local(env, result);
2106 return ret;
2107 JNI_END
2109 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject);
2111 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2112 JNIWrapper("GetObjectArrayElement");
2113 DTRACE_PROBE3(hotspot_jni, GetObjectArrayElement__entry, env, array, index);
2114 jobject ret = NULL;
2115 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2116 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2117 if (a->is_within_bounds(index)) {
2118 jobject ret = JNIHandles::make_local(env, a->obj_at(index));
2119 return ret;
2120 } else {
2121 char buf[jintAsStringSize];
2122 sprintf(buf, "%d", index);
2123 THROW_MSG_0(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2124 }
2125 JNI_END
2127 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement);
2129 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2130 JNIWrapper("SetObjectArrayElement");
2131 DTRACE_PROBE4(hotspot_jni, SetObjectArrayElement__entry, env, array, index, value);
2132 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2134 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2135 oop v = JNIHandles::resolve(value);
2136 if (a->is_within_bounds(index)) {
2137 if (v == NULL || v->is_a(objArrayKlass::cast(a->klass())->element_klass())) {
2138 a->obj_at_put(index, v);
2139 } else {
2140 THROW(vmSymbols::java_lang_ArrayStoreException());
2141 }
2142 } else {
2143 char buf[jintAsStringSize];
2144 sprintf(buf, "%d", index);
2145 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2146 }
2147 JNI_END
2150 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result) \
2151 \
2152 DT_RETURN_MARK_DECL_FOR(Result, New##Result##Array, Return);\
2153 \
2154 JNI_ENTRY(Return, \
2155 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2156 JNIWrapper("New" XSTR(Result) "Array"); \
2157 DTRACE_PROBE2(hotspot_jni, New##Result##Array__entry, env, len);\
2158 Return ret = NULL;\
2159 DT_RETURN_MARK_FOR(Result, New##Result##Array, Return, (const Return&)ret);\
2160 \
2161 oop obj= oopFactory::Allocator(len, CHECK_0); \
2162 ret = (Return) JNIHandles::make_local(env, obj); \
2163 return ret;\
2164 JNI_END
2166 DEFINE_NEWSCALARARRAY(jbooleanArray, new_boolArray, Boolean)
2167 DEFINE_NEWSCALARARRAY(jbyteArray, new_byteArray, Byte)
2168 DEFINE_NEWSCALARARRAY(jshortArray, new_shortArray, Short)
2169 DEFINE_NEWSCALARARRAY(jcharArray, new_charArray, Char)
2170 DEFINE_NEWSCALARARRAY(jintArray, new_intArray, Int)
2171 DEFINE_NEWSCALARARRAY(jlongArray, new_longArray, Long)
2172 DEFINE_NEWSCALARARRAY(jfloatArray, new_singleArray, Float)
2173 DEFINE_NEWSCALARARRAY(jdoubleArray, new_doubleArray, Double)
2176 // Return an address which will fault if the caller writes to it.
2178 static char* get_bad_address() {
2179 static char* bad_address = NULL;
2180 if (bad_address == NULL) {
2181 size_t size = os::vm_allocation_granularity();
2182 bad_address = os::reserve_memory(size);
2183 if (bad_address != NULL) {
2184 os::protect_memory(bad_address, size, os::MEM_PROT_READ,
2185 /*is_committed*/false);
2186 }
2187 }
2188 return bad_address;
2189 }
2192 #define DEFINE_GETSCALARARRAYELEMENTS(ElementTag,ElementType,Result, Tag) \
2193 \
2194 JNI_QUICK_ENTRY(ElementType*, \
2195 jni_Get##Result##ArrayElements(JNIEnv *env, ElementType##Array array, jboolean *isCopy)) \
2196 JNIWrapper("Get" XSTR(Result) "ArrayElements"); \
2197 DTRACE_PROBE3(hotspot_jni, Get##Result##ArrayElements__entry, env, array, isCopy);\
2198 /* allocate an chunk of memory in c land */ \
2199 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2200 ElementType* result; \
2201 int len = a->length(); \
2202 if (len == 0) { \
2203 /* Empty array: legal but useless, can't return NULL. \
2204 * Return a pointer to something useless. \
2205 * Avoid asserts in typeArrayOop. */ \
2206 result = (ElementType*)get_bad_address(); \
2207 } else { \
2208 result = NEW_C_HEAP_ARRAY(ElementType, len); \
2209 /* copy the array to the c chunk */ \
2210 memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \
2211 } \
2212 if (isCopy) *isCopy = JNI_TRUE; \
2213 DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\
2214 return result; \
2215 JNI_END
2217 DEFINE_GETSCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2218 DEFINE_GETSCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2219 DEFINE_GETSCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2220 DEFINE_GETSCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2221 DEFINE_GETSCALARARRAYELEMENTS(T_INT, jint, Int, int)
2222 DEFINE_GETSCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2223 DEFINE_GETSCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2224 DEFINE_GETSCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2227 #define DEFINE_RELEASESCALARARRAYELEMENTS(ElementTag,ElementType,Result,Tag) \
2228 \
2229 JNI_QUICK_ENTRY(void, \
2230 jni_Release##Result##ArrayElements(JNIEnv *env, ElementType##Array array, \
2231 ElementType *buf, jint mode)) \
2232 JNIWrapper("Release" XSTR(Result) "ArrayElements"); \
2233 DTRACE_PROBE4(hotspot_jni, Release##Result##ArrayElements__entry, env, array, buf, mode);\
2234 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2235 int len = a->length(); \
2236 if (len != 0) { /* Empty array: nothing to free or copy. */ \
2237 if ((mode == 0) || (mode == JNI_COMMIT)) { \
2238 memcpy(a->Tag##_at_addr(0), buf, sizeof(ElementType)*len); \
2239 } \
2240 if ((mode == 0) || (mode == JNI_ABORT)) { \
2241 FreeHeap(buf); \
2242 } \
2243 } \
2244 DTRACE_PROBE(hotspot_jni, Release##Result##ArrayElements__return);\
2245 JNI_END
2247 DEFINE_RELEASESCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2248 DEFINE_RELEASESCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2249 DEFINE_RELEASESCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2250 DEFINE_RELEASESCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2251 DEFINE_RELEASESCALARARRAYELEMENTS(T_INT, jint, Int, int)
2252 DEFINE_RELEASESCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2253 DEFINE_RELEASESCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2254 DEFINE_RELEASESCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2256 #define DEFINE_GETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2257 DT_VOID_RETURN_MARK_DECL(Get##Result##ArrayRegion);\
2258 \
2259 JNI_ENTRY(void, \
2260 jni_Get##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2261 jsize len, ElementType *buf)) \
2262 JNIWrapper("Get" XSTR(Result) "ArrayRegion"); \
2263 DTRACE_PROBE5(hotspot_jni, Get##Result##ArrayRegion__entry, env, array, start, len, buf);\
2264 DT_VOID_RETURN_MARK(Get##Result##ArrayRegion); \
2265 typeArrayOop src = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2266 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)src->length())) { \
2267 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2268 } else { \
2269 if (len > 0) { \
2270 int sc = typeArrayKlass::cast(src->klass())->log2_element_size(); \
2271 memcpy((u_char*) buf, \
2272 (u_char*) src->Tag##_at_addr(start), \
2273 len << sc); \
2274 } \
2275 } \
2276 JNI_END
2278 DEFINE_GETSCALARARRAYREGION(T_BOOLEAN, jboolean,Boolean, bool)
2279 DEFINE_GETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2280 DEFINE_GETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2281 DEFINE_GETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2282 DEFINE_GETSCALARARRAYREGION(T_INT, jint, Int, int)
2283 DEFINE_GETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2284 DEFINE_GETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2285 DEFINE_GETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2287 #define DEFINE_SETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2288 DT_VOID_RETURN_MARK_DECL(Set##Result##ArrayRegion);\
2289 \
2290 JNI_ENTRY(void, \
2291 jni_Set##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2292 jsize len, const ElementType *buf)) \
2293 JNIWrapper("Set" XSTR(Result) "ArrayRegion"); \
2294 DTRACE_PROBE5(hotspot_jni, Set##Result##ArrayRegion__entry, env, array, start, len, buf);\
2295 DT_VOID_RETURN_MARK(Set##Result##ArrayRegion); \
2296 typeArrayOop dst = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2297 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)dst->length())) { \
2298 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2299 } else { \
2300 if (len > 0) { \
2301 int sc = typeArrayKlass::cast(dst->klass())->log2_element_size(); \
2302 memcpy((u_char*) dst->Tag##_at_addr(start), \
2303 (u_char*) buf, \
2304 len << sc); \
2305 } \
2306 } \
2307 JNI_END
2309 DEFINE_SETSCALARARRAYREGION(T_BOOLEAN, jboolean, Boolean, bool)
2310 DEFINE_SETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2311 DEFINE_SETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2312 DEFINE_SETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2313 DEFINE_SETSCALARARRAYREGION(T_INT, jint, Int, int)
2314 DEFINE_SETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2315 DEFINE_SETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2316 DEFINE_SETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2319 //
2320 // Interception of natives
2321 //
2323 // The RegisterNatives call being attempted tried to register with a method that
2324 // is not native. Ask JVM TI what prefixes have been specified. Then check
2325 // to see if the native method is now wrapped with the prefixes. See the
2326 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
2327 static methodOop find_prefixed_native(KlassHandle k,
2328 symbolHandle name, symbolHandle signature, TRAPS) {
2329 ResourceMark rm(THREAD);
2330 methodOop method;
2331 int name_len = name->utf8_length();
2332 char* name_str = name->as_utf8();
2333 int prefix_count;
2334 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
2335 for (int i = 0; i < prefix_count; i++) {
2336 char* prefix = prefixes[i];
2337 int prefix_len = (int)strlen(prefix);
2339 // try adding this prefix to the method name and see if it matches another method name
2340 int trial_len = name_len + prefix_len;
2341 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
2342 strcpy(trial_name_str, prefix);
2343 strcat(trial_name_str, name_str);
2344 symbolHandle trial_name(THREAD, SymbolTable::probe(trial_name_str, trial_len));
2345 if (trial_name.is_null()) {
2346 continue; // no such symbol, so this prefix wasn't used, try the next prefix
2347 }
2348 method = Klass::cast(k())->lookup_method(trial_name(), signature());
2349 if (method == NULL) {
2350 continue; // signature doesn't match, try the next prefix
2351 }
2352 if (method->is_native()) {
2353 method->set_is_prefixed_native();
2354 return method; // wahoo, we found a prefixed version of the method, return it
2355 }
2356 // found as non-native, so prefix is good, add it, probably just need more prefixes
2357 name_len = trial_len;
2358 name_str = trial_name_str;
2359 }
2360 return NULL; // not found
2361 }
2363 static bool register_native(KlassHandle k, symbolHandle name, symbolHandle signature, address entry, TRAPS) {
2364 methodOop method = Klass::cast(k())->lookup_method(name(), signature());
2365 if (method == NULL) {
2366 ResourceMark rm;
2367 stringStream st;
2368 st.print("Method %s name or signature does not match",
2369 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
2370 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2371 }
2372 if (!method->is_native()) {
2373 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
2374 method = find_prefixed_native(k, name, signature, THREAD);
2375 if (method == NULL) {
2376 ResourceMark rm;
2377 stringStream st;
2378 st.print("Method %s is not declared as native",
2379 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name(), signature()));
2380 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2381 }
2382 }
2384 if (entry != NULL) {
2385 method->set_native_function(entry,
2386 methodOopDesc::native_bind_event_is_interesting);
2387 } else {
2388 method->clear_native_function();
2389 }
2390 if (PrintJNIResolving) {
2391 ResourceMark rm(THREAD);
2392 tty->print_cr("[Registering JNI native method %s.%s]",
2393 Klass::cast(method->method_holder())->external_name(),
2394 method->name()->as_C_string());
2395 }
2396 return true;
2397 }
2399 DT_RETURN_MARK_DECL(RegisterNatives, jint);
2401 JNI_ENTRY(jint, jni_RegisterNatives(JNIEnv *env, jclass clazz,
2402 const JNINativeMethod *methods,
2403 jint nMethods))
2404 JNIWrapper("RegisterNatives");
2405 DTRACE_PROBE4(hotspot_jni, RegisterNatives__entry, env, clazz, methods, nMethods);
2406 jint ret = 0;
2407 DT_RETURN_MARK(RegisterNatives, jint, (const jint&)ret);
2409 KlassHandle h_k(thread, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
2411 for (int index = 0; index < nMethods; index++) {
2412 const char* meth_name = methods[index].name;
2413 const char* meth_sig = methods[index].signature;
2414 int meth_name_len = (int)strlen(meth_name);
2416 // The class should have been loaded (we have an instance of the class
2417 // passed in) so the method and signature should already be in the symbol
2418 // table. If they're not there, the method doesn't exist.
2419 symbolHandle name(THREAD, SymbolTable::probe(meth_name, meth_name_len));
2420 symbolHandle signature(THREAD, SymbolTable::probe(meth_sig, (int)strlen(meth_sig)));
2422 if (name.is_null() || signature.is_null()) {
2423 ResourceMark rm;
2424 stringStream st;
2425 st.print("Method %s.%s%s not found", Klass::cast(h_k())->external_name(), meth_name, meth_sig);
2426 // Must return negative value on failure
2427 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), -1);
2428 }
2430 bool res = register_native(h_k, name, signature,
2431 (address) methods[index].fnPtr, THREAD);
2432 if (!res) {
2433 ret = -1;
2434 break;
2435 }
2436 }
2437 return ret;
2438 JNI_END
2441 JNI_ENTRY(jint, jni_UnregisterNatives(JNIEnv *env, jclass clazz))
2442 JNIWrapper("UnregisterNatives");
2443 DTRACE_PROBE2(hotspot_jni, UnregisterNatives__entry, env, clazz);
2444 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz));
2445 //%note jni_2
2446 if (Klass::cast(k)->oop_is_instance()) {
2447 for (int index = 0; index < instanceKlass::cast(k)->methods()->length(); index++) {
2448 methodOop m = methodOop(instanceKlass::cast(k)->methods()->obj_at(index));
2449 if (m->is_native()) {
2450 m->clear_native_function();
2451 m->set_signature_handler(NULL);
2452 }
2453 }
2454 }
2455 DTRACE_PROBE1(hotspot_jni, UnregisterNatives__return, 0);
2456 return 0;
2457 JNI_END
2459 //
2460 // Monitor functions
2461 //
2463 DT_RETURN_MARK_DECL(MonitorEnter, jint);
2465 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2466 DTRACE_PROBE2(hotspot_jni, MonitorEnter__entry, env, jobj);
2467 jint ret = JNI_ERR;
2468 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2470 // If the object is null, we can't do anything with it
2471 if (jobj == NULL) {
2472 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2473 }
2475 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2476 ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR));
2477 ret = JNI_OK;
2478 return ret;
2479 JNI_END
2481 DT_RETURN_MARK_DECL(MonitorExit, jint);
2483 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2484 DTRACE_PROBE2(hotspot_jni, MonitorExit__entry, env, jobj);
2485 jint ret = JNI_ERR;
2486 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2488 // Don't do anything with a null object
2489 if (jobj == NULL) {
2490 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2491 }
2493 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2494 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2496 ret = JNI_OK;
2497 return ret;
2498 JNI_END
2500 //
2501 // Extensions
2502 //
2504 DT_VOID_RETURN_MARK_DECL(GetStringRegion);
2506 JNI_ENTRY(void, jni_GetStringRegion(JNIEnv *env, jstring string, jsize start, jsize len, jchar *buf))
2507 JNIWrapper("GetStringRegion");
2508 DTRACE_PROBE5(hotspot_jni, GetStringRegion__entry, env, string, start, len, buf);
2509 DT_VOID_RETURN_MARK(GetStringRegion);
2510 oop s = JNIHandles::resolve_non_null(string);
2511 int s_len = java_lang_String::length(s);
2512 if (start < 0 || len < 0 || start + len > s_len) {
2513 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2514 } else {
2515 if (len > 0) {
2516 int s_offset = java_lang_String::offset(s);
2517 typeArrayOop s_value = java_lang_String::value(s);
2518 memcpy(buf, s_value->char_at_addr(s_offset+start), sizeof(jchar)*len);
2519 }
2520 }
2521 JNI_END
2523 DT_VOID_RETURN_MARK_DECL(GetStringUTFRegion);
2525 JNI_ENTRY(void, jni_GetStringUTFRegion(JNIEnv *env, jstring string, jsize start, jsize len, char *buf))
2526 JNIWrapper("GetStringUTFRegion");
2527 DTRACE_PROBE5(hotspot_jni, GetStringUTFRegion__entry, env, string, start, len, buf);
2528 DT_VOID_RETURN_MARK(GetStringUTFRegion);
2529 oop s = JNIHandles::resolve_non_null(string);
2530 int s_len = java_lang_String::length(s);
2531 if (start < 0 || len < 0 || start + len > s_len) {
2532 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2533 } else {
2534 //%note jni_7
2535 if (len > 0) {
2536 ResourceMark rm(THREAD);
2537 char *utf_region = java_lang_String::as_utf8_string(s, start, len);
2538 int utf_len = (int)strlen(utf_region);
2539 memcpy(buf, utf_region, utf_len);
2540 buf[utf_len] = 0;
2541 } else {
2542 // JDK null-terminates the buffer even in len is zero
2543 if (buf != NULL) {
2544 buf[0] = 0;
2545 }
2546 }
2547 }
2548 JNI_END
2551 JNI_ENTRY(void*, jni_GetPrimitiveArrayCritical(JNIEnv *env, jarray array, jboolean *isCopy))
2552 JNIWrapper("GetPrimitiveArrayCritical");
2553 DTRACE_PROBE3(hotspot_jni, GetPrimitiveArrayCritical__entry, env, array, isCopy);
2554 GC_locker::lock_critical(thread);
2555 if (isCopy != NULL) {
2556 *isCopy = JNI_FALSE;
2557 }
2558 oop a = JNIHandles::resolve_non_null(array);
2559 assert(a->is_array(), "just checking");
2560 BasicType type;
2561 if (a->is_objArray()) {
2562 type = T_OBJECT;
2563 } else {
2564 type = typeArrayKlass::cast(a->klass())->element_type();
2565 }
2566 void* ret = arrayOop(a)->base(type);
2567 DTRACE_PROBE1(hotspot_jni, GetPrimitiveArrayCritical__return, ret);
2568 return ret;
2569 JNI_END
2572 JNI_ENTRY(void, jni_ReleasePrimitiveArrayCritical(JNIEnv *env, jarray array, void *carray, jint mode))
2573 JNIWrapper("ReleasePrimitiveArrayCritical");
2574 DTRACE_PROBE4(hotspot_jni, ReleasePrimitiveArrayCritical__entry, env, array, carray, mode);
2575 // The array, carray and mode arguments are ignored
2576 GC_locker::unlock_critical(thread);
2577 DTRACE_PROBE(hotspot_jni, ReleasePrimitiveArrayCritical__return);
2578 JNI_END
2581 JNI_ENTRY(const jchar*, jni_GetStringCritical(JNIEnv *env, jstring string, jboolean *isCopy))
2582 JNIWrapper("GetStringCritical");
2583 DTRACE_PROBE3(hotspot_jni, GetStringCritical__entry, env, string, isCopy);
2584 GC_locker::lock_critical(thread);
2585 if (isCopy != NULL) {
2586 *isCopy = JNI_FALSE;
2587 }
2588 oop s = JNIHandles::resolve_non_null(string);
2589 int s_len = java_lang_String::length(s);
2590 typeArrayOop s_value = java_lang_String::value(s);
2591 int s_offset = java_lang_String::offset(s);
2592 const jchar* ret;
2593 if (s_len > 0) {
2594 ret = s_value->char_at_addr(s_offset);
2595 } else {
2596 ret = (jchar*) s_value->base(T_CHAR);
2597 }
2598 DTRACE_PROBE1(hotspot_jni, GetStringCritical__return, ret);
2599 return ret;
2600 JNI_END
2603 JNI_ENTRY(void, jni_ReleaseStringCritical(JNIEnv *env, jstring str, const jchar *chars))
2604 JNIWrapper("ReleaseStringCritical");
2605 DTRACE_PROBE3(hotspot_jni, ReleaseStringCritical__entry, env, str, chars);
2606 // The str and chars arguments are ignored
2607 GC_locker::unlock_critical(thread);
2608 DTRACE_PROBE(hotspot_jni, ReleaseStringCritical__return);
2609 JNI_END
2612 JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref))
2613 JNIWrapper("jni_NewWeakGlobalRef");
2614 DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref);
2615 Handle ref_handle(thread, JNIHandles::resolve(ref));
2616 jweak ret = JNIHandles::make_weak_global(ref_handle);
2617 DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret);
2618 return ret;
2619 JNI_END
2621 // Must be JNI_ENTRY (with HandleMark)
2622 JNI_ENTRY(void, jni_DeleteWeakGlobalRef(JNIEnv *env, jweak ref))
2623 JNIWrapper("jni_DeleteWeakGlobalRef");
2624 DTRACE_PROBE2(hotspot_jni, DeleteWeakGlobalRef__entry, env, ref);
2625 JNIHandles::destroy_weak_global(ref);
2626 DTRACE_PROBE(hotspot_jni, DeleteWeakGlobalRef__return);
2627 JNI_END
2630 JNI_QUICK_ENTRY(jboolean, jni_ExceptionCheck(JNIEnv *env))
2631 JNIWrapper("jni_ExceptionCheck");
2632 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__entry, env);
2633 jni_check_async_exceptions(thread);
2634 jboolean ret = (thread->has_pending_exception()) ? JNI_TRUE : JNI_FALSE;
2635 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__return, ret);
2636 return ret;
2637 JNI_END
2640 // Initialization state for three routines below relating to
2641 // java.nio.DirectBuffers
2642 static jint directBufferSupportInitializeStarted = 0;
2643 static volatile jint directBufferSupportInitializeEnded = 0;
2644 static volatile jint directBufferSupportInitializeFailed = 0;
2645 static jclass bufferClass = NULL;
2646 static jclass directBufferClass = NULL;
2647 static jclass directByteBufferClass = NULL;
2648 static jmethodID directByteBufferConstructor = NULL;
2649 static jfieldID directBufferAddressField = NULL;
2650 static jfieldID bufferCapacityField = NULL;
2652 static jclass lookupOne(JNIEnv* env, const char* name, TRAPS) {
2653 Handle loader; // null (bootstrap) loader
2654 Handle protection_domain; // null protection domain
2656 symbolHandle sym = oopFactory::new_symbol_handle(name, CHECK_NULL);
2657 jclass result = find_class_from_class_loader(env, sym, true, loader, protection_domain, true, CHECK_NULL);
2659 if (TraceClassResolution && result != NULL) {
2660 trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
2661 }
2662 return result;
2663 }
2665 // These lookups are done with the NULL (bootstrap) ClassLoader to
2666 // circumvent any security checks that would be done by jni_FindClass.
2667 JNI_ENTRY(bool, lookupDirectBufferClasses(JNIEnv* env))
2668 {
2669 if ((bufferClass = lookupOne(env, "java/nio/Buffer", thread)) == NULL) { return false; }
2670 if ((directBufferClass = lookupOne(env, "sun/nio/ch/DirectBuffer", thread)) == NULL) { return false; }
2671 if ((directByteBufferClass = lookupOne(env, "java/nio/DirectByteBuffer", thread)) == NULL) { return false; }
2672 return true;
2673 }
2674 JNI_END
2677 static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) {
2678 if (directBufferSupportInitializeFailed) {
2679 return false;
2680 }
2682 if (Atomic::cmpxchg(1, &directBufferSupportInitializeStarted, 0) == 0) {
2683 if (!lookupDirectBufferClasses(env)) {
2684 directBufferSupportInitializeFailed = 1;
2685 return false;
2686 }
2688 // Make global references for these
2689 bufferClass = (jclass) env->NewGlobalRef(bufferClass);
2690 directBufferClass = (jclass) env->NewGlobalRef(directBufferClass);
2691 directByteBufferClass = (jclass) env->NewGlobalRef(directByteBufferClass);
2693 // Get needed field and method IDs
2694 directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V");
2695 directBufferAddressField = env->GetFieldID(bufferClass, "address", "J");
2696 bufferCapacityField = env->GetFieldID(bufferClass, "capacity", "I");
2698 if ((directByteBufferConstructor == NULL) ||
2699 (directBufferAddressField == NULL) ||
2700 (bufferCapacityField == NULL)) {
2701 directBufferSupportInitializeFailed = 1;
2702 return false;
2703 }
2705 directBufferSupportInitializeEnded = 1;
2706 } else {
2707 while (!directBufferSupportInitializeEnded && !directBufferSupportInitializeFailed) {
2708 // Set state as yield_all can call os:sleep. On Solaris, yield_all calls
2709 // os::sleep which requires the VM state transition. On other platforms, it
2710 // is not necessary. The following call to change the VM state is purposely
2711 // put inside the loop to avoid potential deadlock when multiple threads
2712 // try to call this method. See 6791815 for more details.
2713 ThreadInVMfromNative tivn(thread);
2714 os::yield_all();
2715 }
2716 }
2718 return !directBufferSupportInitializeFailed;
2719 }
2721 extern "C" jobject JNICALL jni_NewDirectByteBuffer(JNIEnv *env, void* address, jlong capacity)
2722 {
2723 // thread_from_jni_environment() will block if VM is gone.
2724 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2726 JNIWrapper("jni_NewDirectByteBuffer");
2727 DTRACE_PROBE3(hotspot_jni, NewDirectByteBuffer__entry, env, address, capacity);
2729 if (!directBufferSupportInitializeEnded) {
2730 if (!initializeDirectBufferSupport(env, thread)) {
2731 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, NULL);
2732 return NULL;
2733 }
2734 }
2736 // Being paranoid about accidental sign extension on address
2737 jlong addr = (jlong) ((uintptr_t) address);
2738 // NOTE that package-private DirectByteBuffer constructor currently
2739 // takes int capacity
2740 jint cap = (jint) capacity;
2741 jobject ret = env->NewObject(directByteBufferClass, directByteBufferConstructor, addr, cap);
2742 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, ret);
2743 return ret;
2744 }
2746 DT_RETURN_MARK_DECL(GetDirectBufferAddress, void*);
2748 extern "C" void* JNICALL jni_GetDirectBufferAddress(JNIEnv *env, jobject buf)
2749 {
2750 // thread_from_jni_environment() will block if VM is gone.
2751 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2753 JNIWrapper("jni_GetDirectBufferAddress");
2754 DTRACE_PROBE2(hotspot_jni, GetDirectBufferAddress__entry, env, buf);
2755 void* ret = NULL;
2756 DT_RETURN_MARK(GetDirectBufferAddress, void*, (const void*&)ret);
2758 if (!directBufferSupportInitializeEnded) {
2759 if (!initializeDirectBufferSupport(env, thread)) {
2760 return 0;
2761 }
2762 }
2764 if ((buf != NULL) && (!env->IsInstanceOf(buf, directBufferClass))) {
2765 return 0;
2766 }
2768 ret = (void*)(intptr_t)env->GetLongField(buf, directBufferAddressField);
2769 return ret;
2770 }
2772 DT_RETURN_MARK_DECL(GetDirectBufferCapacity, jlong);
2774 extern "C" jlong JNICALL jni_GetDirectBufferCapacity(JNIEnv *env, jobject buf)
2775 {
2776 // thread_from_jni_environment() will block if VM is gone.
2777 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2779 JNIWrapper("jni_GetDirectBufferCapacity");
2780 DTRACE_PROBE2(hotspot_jni, GetDirectBufferCapacity__entry, env, buf);
2781 jlong ret = -1;
2782 DT_RETURN_MARK(GetDirectBufferCapacity, jlong, (const jlong&)ret);
2784 if (!directBufferSupportInitializeEnded) {
2785 if (!initializeDirectBufferSupport(env, thread)) {
2786 ret = 0;
2787 return ret;
2788 }
2789 }
2791 if (buf == NULL) {
2792 return -1;
2793 }
2795 if (!env->IsInstanceOf(buf, directBufferClass)) {
2796 return -1;
2797 }
2799 // NOTE that capacity is currently an int in the implementation
2800 ret = env->GetIntField(buf, bufferCapacityField);
2801 return ret;
2802 }
2805 JNI_LEAF(jint, jni_GetVersion(JNIEnv *env))
2806 JNIWrapper("GetVersion");
2807 DTRACE_PROBE1(hotspot_jni, GetVersion__entry, env);
2808 DTRACE_PROBE1(hotspot_jni, GetVersion__return, CurrentVersion);
2809 return CurrentVersion;
2810 JNI_END
2812 extern struct JavaVM_ main_vm;
2814 JNI_LEAF(jint, jni_GetJavaVM(JNIEnv *env, JavaVM **vm))
2815 JNIWrapper("jni_GetJavaVM");
2816 DTRACE_PROBE2(hotspot_jni, GetJavaVM__entry, env, vm);
2817 *vm = (JavaVM *)(&main_vm);
2818 DTRACE_PROBE1(hotspot_jni, GetJavaVM__return, JNI_OK);
2819 return JNI_OK;
2820 JNI_END
2822 // Structure containing all jni functions
2823 struct JNINativeInterface_ jni_NativeInterface = {
2824 NULL,
2825 NULL,
2826 NULL,
2828 NULL,
2830 jni_GetVersion,
2832 jni_DefineClass,
2833 jni_FindClass,
2835 jni_FromReflectedMethod,
2836 jni_FromReflectedField,
2838 jni_ToReflectedMethod,
2840 jni_GetSuperclass,
2841 jni_IsAssignableFrom,
2843 jni_ToReflectedField,
2845 jni_Throw,
2846 jni_ThrowNew,
2847 jni_ExceptionOccurred,
2848 jni_ExceptionDescribe,
2849 jni_ExceptionClear,
2850 jni_FatalError,
2852 jni_PushLocalFrame,
2853 jni_PopLocalFrame,
2855 jni_NewGlobalRef,
2856 jni_DeleteGlobalRef,
2857 jni_DeleteLocalRef,
2858 jni_IsSameObject,
2860 jni_NewLocalRef,
2861 jni_EnsureLocalCapacity,
2863 jni_AllocObject,
2864 jni_NewObject,
2865 jni_NewObjectV,
2866 jni_NewObjectA,
2868 jni_GetObjectClass,
2869 jni_IsInstanceOf,
2871 jni_GetMethodID,
2873 jni_CallObjectMethod,
2874 jni_CallObjectMethodV,
2875 jni_CallObjectMethodA,
2876 jni_CallBooleanMethod,
2877 jni_CallBooleanMethodV,
2878 jni_CallBooleanMethodA,
2879 jni_CallByteMethod,
2880 jni_CallByteMethodV,
2881 jni_CallByteMethodA,
2882 jni_CallCharMethod,
2883 jni_CallCharMethodV,
2884 jni_CallCharMethodA,
2885 jni_CallShortMethod,
2886 jni_CallShortMethodV,
2887 jni_CallShortMethodA,
2888 jni_CallIntMethod,
2889 jni_CallIntMethodV,
2890 jni_CallIntMethodA,
2891 jni_CallLongMethod,
2892 jni_CallLongMethodV,
2893 jni_CallLongMethodA,
2894 jni_CallFloatMethod,
2895 jni_CallFloatMethodV,
2896 jni_CallFloatMethodA,
2897 jni_CallDoubleMethod,
2898 jni_CallDoubleMethodV,
2899 jni_CallDoubleMethodA,
2900 jni_CallVoidMethod,
2901 jni_CallVoidMethodV,
2902 jni_CallVoidMethodA,
2904 jni_CallNonvirtualObjectMethod,
2905 jni_CallNonvirtualObjectMethodV,
2906 jni_CallNonvirtualObjectMethodA,
2907 jni_CallNonvirtualBooleanMethod,
2908 jni_CallNonvirtualBooleanMethodV,
2909 jni_CallNonvirtualBooleanMethodA,
2910 jni_CallNonvirtualByteMethod,
2911 jni_CallNonvirtualByteMethodV,
2912 jni_CallNonvirtualByteMethodA,
2913 jni_CallNonvirtualCharMethod,
2914 jni_CallNonvirtualCharMethodV,
2915 jni_CallNonvirtualCharMethodA,
2916 jni_CallNonvirtualShortMethod,
2917 jni_CallNonvirtualShortMethodV,
2918 jni_CallNonvirtualShortMethodA,
2919 jni_CallNonvirtualIntMethod,
2920 jni_CallNonvirtualIntMethodV,
2921 jni_CallNonvirtualIntMethodA,
2922 jni_CallNonvirtualLongMethod,
2923 jni_CallNonvirtualLongMethodV,
2924 jni_CallNonvirtualLongMethodA,
2925 jni_CallNonvirtualFloatMethod,
2926 jni_CallNonvirtualFloatMethodV,
2927 jni_CallNonvirtualFloatMethodA,
2928 jni_CallNonvirtualDoubleMethod,
2929 jni_CallNonvirtualDoubleMethodV,
2930 jni_CallNonvirtualDoubleMethodA,
2931 jni_CallNonvirtualVoidMethod,
2932 jni_CallNonvirtualVoidMethodV,
2933 jni_CallNonvirtualVoidMethodA,
2935 jni_GetFieldID,
2937 jni_GetObjectField,
2938 jni_GetBooleanField,
2939 jni_GetByteField,
2940 jni_GetCharField,
2941 jni_GetShortField,
2942 jni_GetIntField,
2943 jni_GetLongField,
2944 jni_GetFloatField,
2945 jni_GetDoubleField,
2947 jni_SetObjectField,
2948 jni_SetBooleanField,
2949 jni_SetByteField,
2950 jni_SetCharField,
2951 jni_SetShortField,
2952 jni_SetIntField,
2953 jni_SetLongField,
2954 jni_SetFloatField,
2955 jni_SetDoubleField,
2957 jni_GetStaticMethodID,
2959 jni_CallStaticObjectMethod,
2960 jni_CallStaticObjectMethodV,
2961 jni_CallStaticObjectMethodA,
2962 jni_CallStaticBooleanMethod,
2963 jni_CallStaticBooleanMethodV,
2964 jni_CallStaticBooleanMethodA,
2965 jni_CallStaticByteMethod,
2966 jni_CallStaticByteMethodV,
2967 jni_CallStaticByteMethodA,
2968 jni_CallStaticCharMethod,
2969 jni_CallStaticCharMethodV,
2970 jni_CallStaticCharMethodA,
2971 jni_CallStaticShortMethod,
2972 jni_CallStaticShortMethodV,
2973 jni_CallStaticShortMethodA,
2974 jni_CallStaticIntMethod,
2975 jni_CallStaticIntMethodV,
2976 jni_CallStaticIntMethodA,
2977 jni_CallStaticLongMethod,
2978 jni_CallStaticLongMethodV,
2979 jni_CallStaticLongMethodA,
2980 jni_CallStaticFloatMethod,
2981 jni_CallStaticFloatMethodV,
2982 jni_CallStaticFloatMethodA,
2983 jni_CallStaticDoubleMethod,
2984 jni_CallStaticDoubleMethodV,
2985 jni_CallStaticDoubleMethodA,
2986 jni_CallStaticVoidMethod,
2987 jni_CallStaticVoidMethodV,
2988 jni_CallStaticVoidMethodA,
2990 jni_GetStaticFieldID,
2992 jni_GetStaticObjectField,
2993 jni_GetStaticBooleanField,
2994 jni_GetStaticByteField,
2995 jni_GetStaticCharField,
2996 jni_GetStaticShortField,
2997 jni_GetStaticIntField,
2998 jni_GetStaticLongField,
2999 jni_GetStaticFloatField,
3000 jni_GetStaticDoubleField,
3002 jni_SetStaticObjectField,
3003 jni_SetStaticBooleanField,
3004 jni_SetStaticByteField,
3005 jni_SetStaticCharField,
3006 jni_SetStaticShortField,
3007 jni_SetStaticIntField,
3008 jni_SetStaticLongField,
3009 jni_SetStaticFloatField,
3010 jni_SetStaticDoubleField,
3012 jni_NewString,
3013 jni_GetStringLength,
3014 jni_GetStringChars,
3015 jni_ReleaseStringChars,
3017 jni_NewStringUTF,
3018 jni_GetStringUTFLength,
3019 jni_GetStringUTFChars,
3020 jni_ReleaseStringUTFChars,
3022 jni_GetArrayLength,
3024 jni_NewObjectArray,
3025 jni_GetObjectArrayElement,
3026 jni_SetObjectArrayElement,
3028 jni_NewBooleanArray,
3029 jni_NewByteArray,
3030 jni_NewCharArray,
3031 jni_NewShortArray,
3032 jni_NewIntArray,
3033 jni_NewLongArray,
3034 jni_NewFloatArray,
3035 jni_NewDoubleArray,
3037 jni_GetBooleanArrayElements,
3038 jni_GetByteArrayElements,
3039 jni_GetCharArrayElements,
3040 jni_GetShortArrayElements,
3041 jni_GetIntArrayElements,
3042 jni_GetLongArrayElements,
3043 jni_GetFloatArrayElements,
3044 jni_GetDoubleArrayElements,
3046 jni_ReleaseBooleanArrayElements,
3047 jni_ReleaseByteArrayElements,
3048 jni_ReleaseCharArrayElements,
3049 jni_ReleaseShortArrayElements,
3050 jni_ReleaseIntArrayElements,
3051 jni_ReleaseLongArrayElements,
3052 jni_ReleaseFloatArrayElements,
3053 jni_ReleaseDoubleArrayElements,
3055 jni_GetBooleanArrayRegion,
3056 jni_GetByteArrayRegion,
3057 jni_GetCharArrayRegion,
3058 jni_GetShortArrayRegion,
3059 jni_GetIntArrayRegion,
3060 jni_GetLongArrayRegion,
3061 jni_GetFloatArrayRegion,
3062 jni_GetDoubleArrayRegion,
3064 jni_SetBooleanArrayRegion,
3065 jni_SetByteArrayRegion,
3066 jni_SetCharArrayRegion,
3067 jni_SetShortArrayRegion,
3068 jni_SetIntArrayRegion,
3069 jni_SetLongArrayRegion,
3070 jni_SetFloatArrayRegion,
3071 jni_SetDoubleArrayRegion,
3073 jni_RegisterNatives,
3074 jni_UnregisterNatives,
3076 jni_MonitorEnter,
3077 jni_MonitorExit,
3079 jni_GetJavaVM,
3081 jni_GetStringRegion,
3082 jni_GetStringUTFRegion,
3084 jni_GetPrimitiveArrayCritical,
3085 jni_ReleasePrimitiveArrayCritical,
3087 jni_GetStringCritical,
3088 jni_ReleaseStringCritical,
3090 jni_NewWeakGlobalRef,
3091 jni_DeleteWeakGlobalRef,
3093 jni_ExceptionCheck,
3095 jni_NewDirectByteBuffer,
3096 jni_GetDirectBufferAddress,
3097 jni_GetDirectBufferCapacity,
3099 // New 1_6 features
3101 jni_GetObjectRefType
3102 };
3105 // For jvmti use to modify jni function table.
3106 // Java threads in native contiues to run until it is transitioned
3107 // to VM at safepoint. Before the transition or before it is blocked
3108 // for safepoint it may access jni function table. VM could crash if
3109 // any java thread access the jni function table in the middle of memcpy.
3110 // To avoid this each function pointers are copied automically.
3111 void copy_jni_function_table(const struct JNINativeInterface_ *new_jni_NativeInterface) {
3112 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
3113 intptr_t *a = (intptr_t *) jni_functions();
3114 intptr_t *b = (intptr_t *) new_jni_NativeInterface;
3115 for (uint i=0; i < sizeof(struct JNINativeInterface_)/sizeof(void *); i++) {
3116 Atomic::store_ptr(*b++, a++);
3117 }
3118 }
3120 void quicken_jni_functions() {
3121 // Replace Get<Primitive>Field with fast versions
3122 if (UseFastJNIAccessors && !JvmtiExport::can_post_field_access()
3123 && !VerifyJNIFields && !TraceJNICalls && !CountJNICalls && !CheckJNICalls
3124 #if defined(_WINDOWS) && defined(IA32) && defined(COMPILER2)
3125 // windows x86 currently needs SEH wrapper and the gain of the fast
3126 // versions currently isn't certain for server vm on uniprocessor.
3127 && os::is_MP()
3128 #endif
3129 ) {
3130 address func;
3131 func = JNI_FastGetField::generate_fast_get_boolean_field();
3132 if (func != (address)-1) {
3133 jni_NativeInterface.GetBooleanField = (GetBooleanField_t)func;
3134 }
3135 func = JNI_FastGetField::generate_fast_get_byte_field();
3136 if (func != (address)-1) {
3137 jni_NativeInterface.GetByteField = (GetByteField_t)func;
3138 }
3139 func = JNI_FastGetField::generate_fast_get_char_field();
3140 if (func != (address)-1) {
3141 jni_NativeInterface.GetCharField = (GetCharField_t)func;
3142 }
3143 func = JNI_FastGetField::generate_fast_get_short_field();
3144 if (func != (address)-1) {
3145 jni_NativeInterface.GetShortField = (GetShortField_t)func;
3146 }
3147 func = JNI_FastGetField::generate_fast_get_int_field();
3148 if (func != (address)-1) {
3149 jni_NativeInterface.GetIntField = (GetIntField_t)func;
3150 }
3151 func = JNI_FastGetField::generate_fast_get_long_field();
3152 if (func != (address)-1) {
3153 jni_NativeInterface.GetLongField = (GetLongField_t)func;
3154 }
3155 func = JNI_FastGetField::generate_fast_get_float_field();
3156 if (func != (address)-1) {
3157 jni_NativeInterface.GetFloatField = (GetFloatField_t)func;
3158 }
3159 func = JNI_FastGetField::generate_fast_get_double_field();
3160 if (func != (address)-1) {
3161 jni_NativeInterface.GetDoubleField = (GetDoubleField_t)func;
3162 }
3163 }
3164 }
3166 // Returns the function structure
3167 struct JNINativeInterface_* jni_functions() {
3168 #ifndef JNICHECK_KERNEL
3169 if (CheckJNICalls) return jni_functions_check();
3170 #else // JNICHECK_KERNEL
3171 if (CheckJNICalls) warning("-Xcheck:jni is not supported in kernel vm.");
3172 #endif // JNICHECK_KERNEL
3173 return &jni_NativeInterface;
3174 }
3176 // Returns the function structure
3177 struct JNINativeInterface_* jni_functions_nocheck() {
3178 return &jni_NativeInterface;
3179 }
3182 // Invocation API
3185 // Forward declaration
3186 extern const struct JNIInvokeInterface_ jni_InvokeInterface;
3188 // Global invocation API vars
3189 volatile jint vm_created = 0;
3190 // Indicate whether it is safe to recreate VM
3191 volatile jint safe_to_recreate_vm = 1;
3192 struct JavaVM_ main_vm = {&jni_InvokeInterface};
3195 #define JAVASTACKSIZE (400 * 1024) /* Default size of a thread java stack */
3196 #define PROCSTACKSIZE 0 /* 0 means default size in HPI */
3197 enum { VERIFY_NONE, VERIFY_REMOTE, VERIFY_ALL };
3199 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, void*);
3200 DT_RETURN_MARK_DECL(GetDefaultJavaVMInitArgs, jint);
3202 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args_) {
3203 HS_DTRACE_PROBE1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, args_);
3204 JDK1_1InitArgs *args = (JDK1_1InitArgs *)args_;
3205 jint ret = JNI_ERR;
3206 DT_RETURN_MARK(GetDefaultJavaVMInitArgs, jint, (const jint&)ret);
3208 if (Threads::is_supported_jni_version(args->version)) {
3209 ret = JNI_OK;
3210 }
3211 // 1.1 style no longer supported in hotspot.
3212 // According the JNI spec, we should update args->version on return.
3213 // We also use the structure to communicate with launcher about default
3214 // stack size.
3215 if (args->version == JNI_VERSION_1_1) {
3216 args->version = JNI_VERSION_1_2;
3217 // javaStackSize is int in arguments structure
3218 assert(jlong(ThreadStackSize) * K < INT_MAX, "integer overflow");
3219 args->javaStackSize = (jint)(ThreadStackSize * K);
3220 }
3221 return ret;
3222 }
3224 HS_DTRACE_PROBE_DECL3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3225 DT_RETURN_MARK_DECL(CreateJavaVM, jint);
3227 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) {
3228 HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3230 jint result = JNI_ERR;
3231 DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result);
3233 // At the moment it's only possible to have one Java VM,
3234 // since some of the runtime state is in global variables.
3236 // We cannot use our mutex locks here, since they only work on
3237 // Threads. We do an atomic compare and exchange to ensure only
3238 // one thread can call this method at a time
3240 // We use Atomic::xchg rather than Atomic::add/dec since on some platforms
3241 // the add/dec implementations are dependent on whether we are running
3242 // on a multiprocessor, and at this stage of initialization the os::is_MP
3243 // function used to determine this will always return false. Atomic::xchg
3244 // does not have this problem.
3245 if (Atomic::xchg(1, &vm_created) == 1) {
3246 return JNI_ERR; // already created, or create attempt in progress
3247 }
3248 if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) {
3249 return JNI_ERR; // someone tried and failed and retry not allowed.
3250 }
3252 assert(vm_created == 1, "vm_created is true during the creation");
3254 /**
3255 * Certain errors during initialization are recoverable and do not
3256 * prevent this method from being called again at a later time
3257 * (perhaps with different arguments). However, at a certain
3258 * point during initialization if an error occurs we cannot allow
3259 * this function to be called again (or it will crash). In those
3260 * situations, the 'canTryAgain' flag is set to false, which atomically
3261 * sets safe_to_recreate_vm to 1, such that any new call to
3262 * JNI_CreateJavaVM will immediately fail using the above logic.
3263 */
3264 bool can_try_again = true;
3266 result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again);
3267 if (result == JNI_OK) {
3268 JavaThread *thread = JavaThread::current();
3269 /* thread is thread_in_vm here */
3270 *vm = (JavaVM *)(&main_vm);
3271 *(JNIEnv**)penv = thread->jni_environment();
3273 // Tracks the time application was running before GC
3274 RuntimeService::record_application_start();
3276 // Notify JVMTI
3277 if (JvmtiExport::should_post_thread_life()) {
3278 JvmtiExport::post_thread_start(thread);
3279 }
3280 // Check if we should compile all classes on bootclasspath
3281 NOT_PRODUCT(if (CompileTheWorld) ClassLoader::compile_the_world();)
3282 // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving.
3283 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3284 } else {
3285 if (can_try_again) {
3286 // reset safe_to_recreate_vm to 1 so that retrial would be possible
3287 safe_to_recreate_vm = 1;
3288 }
3290 // Creation failed. We must reset vm_created
3291 *vm = 0;
3292 *(JNIEnv**)penv = 0;
3293 // reset vm_created last to avoid race condition. Use OrderAccess to
3294 // control both compiler and architectural-based reordering.
3295 OrderAccess::release_store(&vm_created, 0);
3296 }
3298 return result;
3299 }
3301 HS_DTRACE_PROBE_DECL3(hotspot_jni, GetCreatedJavaVMs__entry, \
3302 JavaVM**, jsize, jsize*);
3303 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetCreatedJavaVMs__return, jint);
3305 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vm_buf, jsize bufLen, jsize *numVMs) {
3306 // See bug 4367188, the wrapper can sometimes cause VM crashes
3307 // JNIWrapper("GetCreatedJavaVMs");
3308 HS_DTRACE_PROBE3(hotspot_jni, GetCreatedJavaVMs__entry, \
3309 vm_buf, bufLen, numVMs);
3310 if (vm_created) {
3311 if (numVMs != NULL) *numVMs = 1;
3312 if (bufLen > 0) *vm_buf = (JavaVM *)(&main_vm);
3313 } else {
3314 if (numVMs != NULL) *numVMs = 0;
3315 }
3316 HS_DTRACE_PROBE1(hotspot_jni, GetCreatedJavaVMs__return, JNI_OK);
3317 return JNI_OK;
3318 }
3320 extern "C" {
3322 DT_RETURN_MARK_DECL(DestroyJavaVM, jint);
3324 jint JNICALL jni_DestroyJavaVM(JavaVM *vm) {
3325 DTRACE_PROBE1(hotspot_jni, DestroyJavaVM__entry, vm);
3326 jint res = JNI_ERR;
3327 DT_RETURN_MARK(DestroyJavaVM, jint, (const jint&)res);
3329 if (!vm_created) {
3330 res = JNI_ERR;
3331 return res;
3332 }
3334 JNIWrapper("DestroyJavaVM");
3335 JNIEnv *env;
3336 JavaVMAttachArgs destroyargs;
3337 destroyargs.version = CurrentVersion;
3338 destroyargs.name = (char *)"DestroyJavaVM";
3339 destroyargs.group = NULL;
3340 res = vm->AttachCurrentThread((void **)&env, (void *)&destroyargs);
3341 if (res != JNI_OK) {
3342 return res;
3343 }
3345 // Since this is not a JVM_ENTRY we have to set the thread state manually before entering.
3346 JavaThread* thread = JavaThread::current();
3347 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3348 if (Threads::destroy_vm()) {
3349 // Should not change thread state, VM is gone
3350 vm_created = false;
3351 res = JNI_OK;
3352 return res;
3353 } else {
3354 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3355 res = JNI_ERR;
3356 return res;
3357 }
3358 }
3361 static jint attach_current_thread(JavaVM *vm, void **penv, void *_args, bool daemon) {
3362 JavaVMAttachArgs *args = (JavaVMAttachArgs *) _args;
3364 // Check below commented out from JDK1.2fcs as well
3365 /*
3366 if (args && (args->version != JNI_VERSION_1_1 || args->version != JNI_VERSION_1_2)) {
3367 return JNI_EVERSION;
3368 }
3369 */
3371 Thread* t = ThreadLocalStorage::get_thread_slow();
3372 if (t != NULL) {
3373 // If the thread has been attached this operation is a no-op
3374 *(JNIEnv**)penv = ((JavaThread*) t)->jni_environment();
3375 return JNI_OK;
3376 }
3378 // Create a thread and mark it as attaching so it will be skipped by the
3379 // ThreadsListEnumerator - see CR 6404306
3380 JavaThread* thread = new JavaThread(true);
3382 // Set correct safepoint info. The thread is going to call into Java when
3383 // initializing the Java level thread object. Hence, the correct state must
3384 // be set in order for the Safepoint code to deal with it correctly.
3385 thread->set_thread_state(_thread_in_vm);
3386 // Must do this before initialize_thread_local_storage
3387 thread->record_stack_base_and_size();
3388 thread->initialize_thread_local_storage();
3390 if (!os::create_attached_thread(thread)) {
3391 delete thread;
3392 return JNI_ERR;
3393 }
3394 thread->initialize_tlab();
3396 // Crucial that we do not have a safepoint check for this thread, since it has
3397 // not been added to the Thread list yet.
3398 { Threads_lock->lock_without_safepoint_check();
3399 // This must be inside this lock in order to get FullGCALot to work properly, i.e., to
3400 // avoid this thread trying to do a GC before it is added to the thread-list
3401 thread->set_active_handles(JNIHandleBlock::allocate_block());
3402 Threads::add(thread, daemon);
3403 Threads_lock->unlock();
3404 }
3405 // Create thread group and name info from attach arguments
3406 oop group = NULL;
3407 char* thread_name = NULL;
3408 if (args != NULL && Threads::is_supported_jni_version(args->version)) {
3409 group = JNIHandles::resolve(args->group);
3410 thread_name = args->name; // may be NULL
3411 }
3412 if (group == NULL) group = Universe::main_thread_group();
3414 // Create Java level thread object and attach it to this thread
3415 bool attach_failed = false;
3416 {
3417 EXCEPTION_MARK;
3418 HandleMark hm(THREAD);
3419 Handle thread_group(THREAD, group);
3420 thread->allocate_threadObj(thread_group, thread_name, daemon, THREAD);
3421 if (HAS_PENDING_EXCEPTION) {
3422 CLEAR_PENDING_EXCEPTION;
3423 // cleanup outside the handle mark.
3424 attach_failed = true;
3425 }
3426 }
3428 if (attach_failed) {
3429 // Added missing cleanup
3430 thread->cleanup_failed_attach_current_thread();
3431 return JNI_ERR;
3432 }
3434 // mark the thread as no longer attaching
3435 // this uses a fence to push the change through so we don't have
3436 // to regrab the threads_lock
3437 thread->set_attached();
3439 // Enable stack overflow checks
3440 thread->create_stack_guard_pages();
3442 // Set java thread status.
3443 java_lang_Thread::set_thread_status(thread->threadObj(),
3444 java_lang_Thread::RUNNABLE);
3446 // Notify the debugger
3447 if (JvmtiExport::should_post_thread_life()) {
3448 JvmtiExport::post_thread_start(thread);
3449 }
3451 *(JNIEnv**)penv = thread->jni_environment();
3453 // Now leaving the VM, so change thread_state. This is normally automatically taken care
3454 // of in the JVM_ENTRY. But in this situation we have to do it manually. Notice, that by
3455 // using ThreadStateTransition::transition, we do a callback to the safepoint code if
3456 // needed.
3458 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3460 // Perform any platform dependent FPU setup
3461 os::setup_fpu();
3463 return JNI_OK;
3464 }
3467 jint JNICALL jni_AttachCurrentThread(JavaVM *vm, void **penv, void *_args) {
3468 DTRACE_PROBE3(hotspot_jni, AttachCurrentThread__entry, vm, penv, _args);
3469 if (!vm_created) {
3470 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, JNI_ERR);
3471 return JNI_ERR;
3472 }
3474 JNIWrapper("AttachCurrentThread");
3475 jint ret = attach_current_thread(vm, penv, _args, false);
3476 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, ret);
3477 return ret;
3478 }
3481 jint JNICALL jni_DetachCurrentThread(JavaVM *vm) {
3482 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__entry, vm);
3483 VM_Exit::block_if_vm_exited();
3485 JNIWrapper("DetachCurrentThread");
3487 // If the thread has been deattacted the operations is a no-op
3488 if (ThreadLocalStorage::thread() == NULL) {
3489 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3490 return JNI_OK;
3491 }
3493 JavaThread* thread = JavaThread::current();
3494 if (thread->has_last_Java_frame()) {
3495 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_ERR);
3496 // Can't detach a thread that's running java, that can't work.
3497 return JNI_ERR;
3498 }
3500 // Safepoint support. Have to do call-back to safepoint code, if in the
3501 // middel of a safepoint operation
3502 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3504 // XXX: Note that JavaThread::exit() call below removes the guards on the
3505 // stack pages set up via enable_stack_{red,yellow}_zone() calls
3506 // above in jni_AttachCurrentThread. Unfortunately, while the setting
3507 // of the guards is visible in jni_AttachCurrentThread above,
3508 // the removal of the guards is buried below in JavaThread::exit()
3509 // here. The abstraction should be more symmetrically either exposed
3510 // or hidden (e.g. it could probably be hidden in the same
3511 // (platform-dependent) methods where we do alternate stack
3512 // maintenance work?)
3513 thread->exit(false, JavaThread::jni_detach);
3514 delete thread;
3516 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3517 return JNI_OK;
3518 }
3520 DT_RETURN_MARK_DECL(GetEnv, jint);
3522 jint JNICALL jni_GetEnv(JavaVM *vm, void **penv, jint version) {
3523 DTRACE_PROBE3(hotspot_jni, GetEnv__entry, vm, penv, version);
3524 jint ret = JNI_ERR;
3525 DT_RETURN_MARK(GetEnv, jint, (const jint&)ret);
3527 if (!vm_created) {
3528 *penv = NULL;
3529 ret = JNI_EDETACHED;
3530 return ret;
3531 }
3533 if (JvmtiExport::is_jvmti_version(version)) {
3534 ret = JvmtiExport::get_jvmti_interface(vm, penv, version);
3535 return ret;
3536 }
3538 #ifndef JVMPI_VERSION_1
3539 // need these in order to be polite about older agents
3540 #define JVMPI_VERSION_1 ((jint)0x10000001)
3541 #define JVMPI_VERSION_1_1 ((jint)0x10000002)
3542 #define JVMPI_VERSION_1_2 ((jint)0x10000003)
3543 #endif // !JVMPI_VERSION_1
3545 Thread* thread = ThreadLocalStorage::thread();
3546 if (thread != NULL && thread->is_Java_thread()) {
3547 if (Threads::is_supported_jni_version_including_1_1(version)) {
3548 *(JNIEnv**)penv = ((JavaThread*) thread)->jni_environment();
3549 ret = JNI_OK;
3550 return ret;
3552 } else if (version == JVMPI_VERSION_1 ||
3553 version == JVMPI_VERSION_1_1 ||
3554 version == JVMPI_VERSION_1_2) {
3555 tty->print_cr("ERROR: JVMPI, an experimental interface, is no longer supported.");
3556 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3557 ret = JNI_EVERSION;
3558 return ret;
3559 } else if (JvmtiExport::is_jvmdi_version(version)) {
3560 tty->print_cr("FATAL ERROR: JVMDI is no longer supported.");
3561 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3562 ret = JNI_EVERSION;
3563 return ret;
3564 } else {
3565 *penv = NULL;
3566 ret = JNI_EVERSION;
3567 return ret;
3568 }
3569 } else {
3570 *penv = NULL;
3571 ret = JNI_EDETACHED;
3572 return ret;
3573 }
3574 }
3577 jint JNICALL jni_AttachCurrentThreadAsDaemon(JavaVM *vm, void **penv, void *_args) {
3578 DTRACE_PROBE3(hotspot_jni, AttachCurrentThreadAsDaemon__entry, vm, penv, _args);
3579 if (!vm_created) {
3580 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, JNI_ERR);
3581 return JNI_ERR;
3582 }
3584 JNIWrapper("AttachCurrentThreadAsDaemon");
3585 jint ret = attach_current_thread(vm, penv, _args, true);
3586 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, ret);
3587 return ret;
3588 }
3591 } // End extern "C"
3593 const struct JNIInvokeInterface_ jni_InvokeInterface = {
3594 NULL,
3595 NULL,
3596 NULL,
3598 jni_DestroyJavaVM,
3599 jni_AttachCurrentThread,
3600 jni_DetachCurrentThread,
3601 jni_GetEnv,
3602 jni_AttachCurrentThreadAsDaemon
3603 };
