1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #ifndef SERIALGC
33 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
34 #endif // SERIALGC
35 #include "memory/allocation.inline.hpp"
36 #include "memory/gcLocker.inline.hpp"
37 #include "memory/oopFactory.hpp"
38 #include "memory/universe.inline.hpp"
39 #include "oops/instanceKlass.hpp"
40 #include "oops/instanceOop.hpp"
41 #include "oops/markOop.hpp"
42 #include "oops/methodOop.hpp"
43 #include "oops/objArrayKlass.hpp"
44 #include "oops/objArrayOop.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "oops/symbol.hpp"
47 #include "oops/typeArrayKlass.hpp"
48 #include "oops/typeArrayOop.hpp"
49 #include "prims/jni.h"
50 #include "prims/jniCheck.hpp"
51 #include "prims/jniFastGetField.hpp"
52 #include "prims/jvm.h"
53 #include "prims/jvm_misc.hpp"
54 #include "prims/jvmtiExport.hpp"
55 #include "prims/jvmtiThreadState.hpp"
56 #include "runtime/compilationPolicy.hpp"
57 #include "runtime/fieldDescriptor.hpp"
58 #include "runtime/fprofiler.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/interfaceSupport.hpp"
61 #include "runtime/java.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/jfieldIDWorkaround.hpp"
64 #include "runtime/reflection.hpp"
65 #include "runtime/sharedRuntime.hpp"
66 #include "runtime/signature.hpp"
67 #include "runtime/vm_operations.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/dtrace.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/histogram.hpp"
73 #ifdef TARGET_OS_FAMILY_linux
74 # include "os_linux.inline.hpp"
75 # include "thread_linux.inline.hpp"
76 #endif
77 #ifdef TARGET_OS_FAMILY_solaris
78 # include "os_solaris.inline.hpp"
79 # include "thread_solaris.inline.hpp"
80 #endif
81 #ifdef TARGET_OS_FAMILY_windows
82 # include "os_windows.inline.hpp"
83 # include "thread_windows.inline.hpp"
84 #endif
85
86 static jint CurrentVersion = JNI_VERSION_1_6;
87
88
89 // The DT_RETURN_MARK macros create a scoped object to fire the dtrace
90 // '-return' probe regardless of the return path is taken out of the function.
91 // Methods that have multiple return paths use this to avoid having to
92 // instrument each return path. Methods that use CHECK or THROW must use this
93 // since those macros can cause an immedate uninstrumented return.
94 //
95 // In order to get the return value, a reference to the variable containing
96 // the return value must be passed to the contructor of the object, and
97 // the return value must be set before return (since the mark object has
98 // a reference to it).
99 //
100 // Example:
101 // DT_RETURN_MARK_DECL(SomeFunc, int);
102 // JNI_ENTRY(int, SomeFunc, ...)
103 // int return_value = 0;
104 // DT_RETURN_MARK(SomeFunc, int, (const int&)return_value);
105 // foo(CHECK_0)
106 // return_value = 5;
107 // return return_value;
108 // JNI_END
109 #define DT_RETURN_MARK_DECL(name, type) \
110 HS_DTRACE_PROBE_DECL1(hotspot_jni, name##__return, type); \
111 DTRACE_ONLY( \
112 class DTraceReturnProbeMark_##name { \
113 public: \
114 const type& _ret_ref; \
115 DTraceReturnProbeMark_##name(const type& v) : _ret_ref(v) {} \
116 ~DTraceReturnProbeMark_##name() { \
117 HS_DTRACE_PROBE1(hotspot_jni, name##__return, _ret_ref); \
118 } \
119 } \
120 )
121 // Void functions are simpler since there's no return value
122 #define DT_VOID_RETURN_MARK_DECL(name) \
123 HS_DTRACE_PROBE_DECL0(hotspot_jni, name##__return); \
124 DTRACE_ONLY( \
125 class DTraceReturnProbeMark_##name { \
126 public: \
127 ~DTraceReturnProbeMark_##name() { \
128 HS_DTRACE_PROBE0(hotspot_jni, name##__return); \
129 } \
130 } \
131 )
132
133
134 // Place these macros in the function to mark the return. Non-void
135 // functions need the type and address of the return value.
136 #define DT_RETURN_MARK(name, type, ref) \
137 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark(ref) )
138 #define DT_VOID_RETURN_MARK(name) \
139 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark )
140
141
142 // Use these to select distinct code for floating-point vs. non-floating point
143 // situations. Used from within common macros where we need slightly
144 // different behavior for Float/Double
145 #define FP_SELECT_Boolean(intcode, fpcode) intcode
146 #define FP_SELECT_Byte(intcode, fpcode) intcode
147 #define FP_SELECT_Char(intcode, fpcode) intcode
148 #define FP_SELECT_Short(intcode, fpcode) intcode
149 #define FP_SELECT_Object(intcode, fpcode) intcode
150 #define FP_SELECT_Int(intcode, fpcode) intcode
151 #define FP_SELECT_Long(intcode, fpcode) intcode
152 #define FP_SELECT_Float(intcode, fpcode) fpcode
153 #define FP_SELECT_Double(intcode, fpcode) fpcode
154 #define FP_SELECT(TypeName, intcode, fpcode) \
155 FP_SELECT_##TypeName(intcode, fpcode)
156
157 #define COMMA ,
158
159 // Choose DT_RETURN_MARK macros based on the type: float/double -> void
160 // (dtrace doesn't do FP yet)
161 #define DT_RETURN_MARK_DECL_FOR(TypeName, name, type) \
162 FP_SELECT(TypeName, \
163 DT_RETURN_MARK_DECL(name, type), DT_VOID_RETURN_MARK_DECL(name) )
164 #define DT_RETURN_MARK_FOR(TypeName, name, type, ref) \
165 FP_SELECT(TypeName, \
166 DT_RETURN_MARK(name, type, ref), DT_VOID_RETURN_MARK(name) )
167
168
169 // out-of-line helpers for class jfieldIDWorkaround:
170
171 bool jfieldIDWorkaround::is_valid_jfieldID(klassOop k, jfieldID id) {
172 if (jfieldIDWorkaround::is_instance_jfieldID(k, id)) {
173 uintptr_t as_uint = (uintptr_t) id;
174 intptr_t offset = raw_instance_offset(id);
175 if (is_checked_jfieldID(id)) {
176 if (!klass_hash_ok(k, id)) {
177 return false;
178 }
179 }
180 return instanceKlass::cast(k)->contains_field_offset(offset);
181 } else {
182 JNIid* result = (JNIid*) id;
183 #ifdef ASSERT
184 return result != NULL && result->is_static_field_id();
185 #else
186 return result != NULL;
187 #endif
188 }
189 }
190
191
192 intptr_t jfieldIDWorkaround::encode_klass_hash(klassOop k, intptr_t offset) {
193 if (offset <= small_offset_mask) {
194 klassOop field_klass = k;
195 klassOop super_klass = Klass::cast(field_klass)->super();
196 // With compressed oops the most super class with nonstatic fields would
197 // be the owner of fields embedded in the header.
198 while (instanceKlass::cast(super_klass)->has_nonstatic_fields() &&
199 instanceKlass::cast(super_klass)->contains_field_offset(offset)) {
200 field_klass = super_klass; // super contains the field also
201 super_klass = Klass::cast(field_klass)->super();
202 }
203 debug_only(No_Safepoint_Verifier nosafepoint;)
204 uintptr_t klass_hash = field_klass->identity_hash();
205 return ((klass_hash & klass_mask) << klass_shift) | checked_mask_in_place;
206 } else {
207 #if 0
208 #ifndef PRODUCT
209 {
210 ResourceMark rm;
211 warning("VerifyJNIFields: long offset %d in %s", offset, Klass::cast(k)->external_name());
212 }
213 #endif
214 #endif
215 return 0;
216 }
217 }
218
219 bool jfieldIDWorkaround::klass_hash_ok(klassOop k, jfieldID id) {
220 uintptr_t as_uint = (uintptr_t) id;
221 intptr_t klass_hash = (as_uint >> klass_shift) & klass_mask;
222 do {
223 debug_only(No_Safepoint_Verifier nosafepoint;)
224 // Could use a non-blocking query for identity_hash here...
225 if ((k->identity_hash() & klass_mask) == klass_hash)
226 return true;
227 k = Klass::cast(k)->super();
228 } while (k != NULL);
229 return false;
230 }
231
232 void jfieldIDWorkaround::verify_instance_jfieldID(klassOop k, jfieldID id) {
233 guarantee(jfieldIDWorkaround::is_instance_jfieldID(k, id), "must be an instance field" );
234 uintptr_t as_uint = (uintptr_t) id;
235 intptr_t offset = raw_instance_offset(id);
236 if (VerifyJNIFields) {
237 if (is_checked_jfieldID(id)) {
238 guarantee(klass_hash_ok(k, id),
239 "Bug in native code: jfieldID class must match object");
240 } else {
241 #if 0
242 #ifndef PRODUCT
243 if (Verbose) {
244 ResourceMark rm;
245 warning("VerifyJNIFields: unverified offset %d for %s", offset, Klass::cast(k)->external_name());
246 }
247 #endif
248 #endif
249 }
250 }
251 guarantee(instanceKlass::cast(k)->contains_field_offset(offset),
252 "Bug in native code: jfieldID offset must address interior of object");
253 }
254
255 // Pick a reasonable higher bound for local capacity requested
256 // for EnsureLocalCapacity and PushLocalFrame. We don't want it too
257 // high because a test (or very unusual application) may try to allocate
258 // that many handles and run out of swap space. An implementation is
259 // permitted to allocate more handles than the ensured capacity, so this
260 // value is set high enough to prevent compatibility problems.
261 const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K;
262
263
264 // Wrapper to trace JNI functions
265
266 #ifdef ASSERT
267 Histogram* JNIHistogram;
268 static volatile jint JNIHistogram_lock = 0;
269
270 class JNITraceWrapper : public StackObj {
271 public:
272 JNITraceWrapper(const char* format, ...) {
273 if (TraceJNICalls) {
274 va_list ap;
275 va_start(ap, format);
276 tty->print("JNI ");
277 tty->vprint_cr(format, ap);
278 va_end(ap);
279 }
280 }
281 };
282
283 class JNIHistogramElement : public HistogramElement {
284 public:
285 JNIHistogramElement(const char* name);
286 };
287
288 JNIHistogramElement::JNIHistogramElement(const char* elementName) {
289 _name = elementName;
290 uintx count = 0;
291
292 while (Atomic::cmpxchg(1, &JNIHistogram_lock, 0) != 0) {
293 while (OrderAccess::load_acquire(&JNIHistogram_lock) != 0) {
294 count +=1;
295 if ( (WarnOnStalledSpinLock > 0)
296 && (count % WarnOnStalledSpinLock == 0)) {
297 warning("JNIHistogram_lock seems to be stalled");
298 }
299 }
300 }
301
302
303 if(JNIHistogram == NULL)
304 JNIHistogram = new Histogram("JNI Call Counts",100);
305
306 JNIHistogram->add_element(this);
307 Atomic::dec(&JNIHistogram_lock);
308 }
309
310 #define JNICountWrapper(arg) \
311 static JNIHistogramElement* e = new JNIHistogramElement(arg); \
312 /* There is a MT-race condition in VC++. So we need to make sure that that e has been initialized */ \
313 if (e != NULL) e->increment_count()
314 #define JNIWrapper(arg) JNICountWrapper(arg); JNITraceWrapper(arg)
315 #else
316 #define JNIWrapper(arg)
317 #endif
318
319
320 // Implementation of JNI entries
321
322 DT_RETURN_MARK_DECL(DefineClass, jclass);
323
324 JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef,
325 const jbyte *buf, jsize bufLen))
326 JNIWrapper("DefineClass");
327
328 DTRACE_PROBE5(hotspot_jni, DefineClass__entry,
329 env, name, loaderRef, buf, bufLen);
330 jclass cls = NULL;
331 DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls);
332
333 // Since exceptions can be thrown, class initialization can take place
334 // if name is NULL no check for class name in .class stream has to be made.
335 if (name != NULL) {
336 const int str_len = (int)strlen(name);
337 if (str_len > Symbol::max_length()) {
338 // It's impossible to create this class; the name cannot fit
339 // into the constant pool.
340 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
341 }
342 }
343 TempNewSymbol class_name = SymbolTable::new_symbol(name, THREAD);
344
345 ResourceMark rm(THREAD);
346 ClassFileStream st((u1*) buf, bufLen, NULL);
347 Handle class_loader (THREAD, JNIHandles::resolve(loaderRef));
348
349 if (UsePerfData && !class_loader.is_null()) {
350 // check whether the current caller thread holds the lock or not.
351 // If not, increment the corresponding counter
352 if (ObjectSynchronizer::
353 query_lock_ownership((JavaThread*)THREAD, class_loader) !=
354 ObjectSynchronizer::owner_self) {
355 ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc();
356 }
357 }
358 klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
359 Handle(), &st, true,
360 CHECK_NULL);
361
362 if (TraceClassResolution && k != NULL) {
363 trace_class_resolution(k);
364 }
365
366 cls = (jclass)JNIHandles::make_local(
367 env, Klass::cast(k)->java_mirror());
368 return cls;
369 JNI_END
370
371
372
373 static bool first_time_FindClass = true;
374
375 DT_RETURN_MARK_DECL(FindClass, jclass);
376
377 JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name))
378 JNIWrapper("FindClass");
379 DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name);
380
381 jclass result = NULL;
382 DT_RETURN_MARK(FindClass, jclass, (const jclass&)result);
383
384 // Remember if we are the first invocation of jni_FindClass
385 bool first_time = first_time_FindClass;
386 first_time_FindClass = false;
387
388 // Sanity check the name: it cannot be null or larger than the maximum size
389 // name we can fit in the constant pool.
390 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
391 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
392 }
393
394 //%note jni_3
395 Handle loader;
396 Handle protection_domain;
397 // Find calling class
398 instanceKlassHandle k (THREAD, thread->security_get_caller_class(0));
399 if (k.not_null()) {
400 loader = Handle(THREAD, k->class_loader());
401 // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed
402 // in the correct class context.
403 if (loader.is_null() &&
404 k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
405 JavaValue result(T_OBJECT);
406 JavaCalls::call_static(&result, k,
407 vmSymbols::getFromClass_name(),
408 vmSymbols::void_class_signature(),
409 thread);
410 if (HAS_PENDING_EXCEPTION) {
411 Handle ex(thread, thread->pending_exception());
412 CLEAR_PENDING_EXCEPTION;
413 THROW_HANDLE_0(ex);
414 }
415 oop mirror = (oop) result.get_jobject();
416 loader = Handle(THREAD,
417 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader());
418 protection_domain = Handle(THREAD,
419 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain());
420 }
421 } else {
422 // We call ClassLoader.getSystemClassLoader to obtain the system class loader.
423 loader = Handle(THREAD, SystemDictionary::java_system_loader());
424 }
425
426 TempNewSymbol sym = SymbolTable::new_symbol(name, CHECK_NULL);
427 result = find_class_from_class_loader(env, sym, true, loader,
428 protection_domain, true, thread);
429
430 if (TraceClassResolution && result != NULL) {
431 trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
432 }
433
434 // If we were the first invocation of jni_FindClass, we enable compilation again
435 // rather than just allowing invocation counter to overflow and decay.
436 // Controlled by flag DelayCompilationDuringStartup.
437 if (first_time && !CompileTheWorld)
438 CompilationPolicy::completed_vm_startup();
439
440 return result;
441 JNI_END
442
443 DT_RETURN_MARK_DECL(FromReflectedMethod, jmethodID);
444
445 JNI_ENTRY(jmethodID, jni_FromReflectedMethod(JNIEnv *env, jobject method))
446 JNIWrapper("FromReflectedMethod");
447 DTRACE_PROBE2(hotspot_jni, FromReflectedMethod__entry, env, method);
448 jmethodID ret = NULL;
449 DT_RETURN_MARK(FromReflectedMethod, jmethodID, (const jmethodID&)ret);
450
451 // method is a handle to a java.lang.reflect.Method object
452 oop reflected = JNIHandles::resolve_non_null(method);
453 oop mirror = NULL;
454 int slot = 0;
455
456 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
457 mirror = java_lang_reflect_Constructor::clazz(reflected);
458 slot = java_lang_reflect_Constructor::slot(reflected);
459 } else {
460 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), "wrong type");
461 mirror = java_lang_reflect_Method::clazz(reflected);
462 slot = java_lang_reflect_Method::slot(reflected);
463 }
464 klassOop k = java_lang_Class::as_klassOop(mirror);
465
466 KlassHandle k1(THREAD, k);
467 // Make sure class is initialized before handing id's out to methods
468 Klass::cast(k1())->initialize(CHECK_NULL);
469 methodOop m = instanceKlass::cast(k1())->method_with_idnum(slot);
470 ret = m==NULL? NULL : m->jmethod_id(); // return NULL if reflected method deleted
471 return ret;
472 JNI_END
473
474 DT_RETURN_MARK_DECL(FromReflectedField, jfieldID);
475
476 JNI_ENTRY(jfieldID, jni_FromReflectedField(JNIEnv *env, jobject field))
477 JNIWrapper("FromReflectedField");
478 DTRACE_PROBE2(hotspot_jni, FromReflectedField__entry, env, field);
479 jfieldID ret = NULL;
480 DT_RETURN_MARK(FromReflectedField, jfieldID, (const jfieldID&)ret);
481
482 // field is a handle to a java.lang.reflect.Field object
483 oop reflected = JNIHandles::resolve_non_null(field);
484 oop mirror = java_lang_reflect_Field::clazz(reflected);
485 klassOop k = java_lang_Class::as_klassOop(mirror);
486 int slot = java_lang_reflect_Field::slot(reflected);
487 int modifiers = java_lang_reflect_Field::modifiers(reflected);
488
489 KlassHandle k1(THREAD, k);
490 // Make sure class is initialized before handing id's out to fields
491 Klass::cast(k1())->initialize(CHECK_NULL);
492
493 // First check if this is a static field
494 if (modifiers & JVM_ACC_STATIC) {
495 intptr_t offset = instanceKlass::cast(k1())->field_offset( slot );
496 JNIid* id = instanceKlass::cast(k1())->jni_id_for(offset);
497 assert(id != NULL, "corrupt Field object");
498 debug_only(id->set_is_static_field_id();)
499 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
500 ret = jfieldIDWorkaround::to_static_jfieldID(id);
501 return ret;
502 }
503
504 // The slot is the index of the field description in the field-array
505 // The jfieldID is the offset of the field within the object
506 // It may also have hash bits for k, if VerifyJNIFields is turned on.
507 intptr_t offset = instanceKlass::cast(k1())->field_offset( slot );
508 assert(instanceKlass::cast(k1())->contains_field_offset(offset), "stay within object");
509 ret = jfieldIDWorkaround::to_instance_jfieldID(k1(), offset);
510 return ret;
511 JNI_END
512
513 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject);
514
515 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
516 JNIWrapper("ToReflectedMethod");
517 DTRACE_PROBE4(hotspot_jni, ToReflectedMethod__entry, env, cls, method_id, isStatic);
518 jobject ret = NULL;
519 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
520
521 methodHandle m (THREAD, JNIHandles::resolve_jmethod_id(method_id));
522 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
523 oop reflection_method;
524 if (m->is_initializer()) {
525 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
526 } else {
527 reflection_method = Reflection::new_method(m, UseNewReflection, false, CHECK_NULL);
528 }
529 ret = JNIHandles::make_local(env, reflection_method);
530 return ret;
531 JNI_END
532
533 DT_RETURN_MARK_DECL(GetSuperclass, jclass);
534
535 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
536 JNIWrapper("GetSuperclass");
537 DTRACE_PROBE2(hotspot_jni, GetSuperclass__entry, env, sub);
538 jclass obj = NULL;
539 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
540
541 oop mirror = JNIHandles::resolve_non_null(sub);
542 // primitive classes return NULL
543 if (java_lang_Class::is_primitive(mirror)) return NULL;
544
545 // Rules of Class.getSuperClass as implemented by KLass::java_super:
546 // arrays return Object
547 // interfaces return NULL
548 // proper classes return Klass::super()
549 klassOop k = java_lang_Class::as_klassOop(mirror);
550 if (Klass::cast(k)->is_interface()) return NULL;
551
552 // return mirror for superclass
553 klassOop super = Klass::cast(k)->java_super();
554 // super2 is the value computed by the compiler's getSuperClass intrinsic:
555 debug_only(klassOop super2 = ( Klass::cast(k)->oop_is_javaArray()
556 ? SystemDictionary::Object_klass()
557 : Klass::cast(k)->super() ) );
558 assert(super == super2,
559 "java_super computation depends on interface, array, other super");
560 obj = (super == NULL) ? NULL : (jclass) JNIHandles::make_local(Klass::cast(super)->java_mirror());
561 return obj;
562 JNI_END
563
564 JNI_QUICK_ENTRY(jboolean, jni_IsAssignableFrom(JNIEnv *env, jclass sub, jclass super))
565 JNIWrapper("IsSubclassOf");
566 DTRACE_PROBE3(hotspot_jni, IsAssignableFrom__entry, env, sub, super);
567 oop sub_mirror = JNIHandles::resolve_non_null(sub);
568 oop super_mirror = JNIHandles::resolve_non_null(super);
569 if (java_lang_Class::is_primitive(sub_mirror) ||
570 java_lang_Class::is_primitive(super_mirror)) {
571 jboolean ret = (sub_mirror == super_mirror);
572 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
573 return ret;
574 }
575 klassOop sub_klass = java_lang_Class::as_klassOop(sub_mirror);
576 klassOop super_klass = java_lang_Class::as_klassOop(super_mirror);
577 assert(sub_klass != NULL && super_klass != NULL, "invalid arguments to jni_IsAssignableFrom");
578 jboolean ret = Klass::cast(sub_klass)->is_subtype_of(super_klass) ?
579 JNI_TRUE : JNI_FALSE;
580 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
581 return ret;
582 JNI_END
583
584 DT_RETURN_MARK_DECL(Throw, jint);
585
586 JNI_ENTRY(jint, jni_Throw(JNIEnv *env, jthrowable obj))
587 JNIWrapper("Throw");
588 DTRACE_PROBE2(hotspot_jni, Throw__entry, env, obj);
589 jint ret = JNI_OK;
590 DT_RETURN_MARK(Throw, jint, (const jint&)ret);
591
592 THROW_OOP_(JNIHandles::resolve(obj), JNI_OK);
593 ShouldNotReachHere();
594 JNI_END
595
596 DT_RETURN_MARK_DECL(ThrowNew, jint);
597
598 JNI_ENTRY(jint, jni_ThrowNew(JNIEnv *env, jclass clazz, const char *message))
599 JNIWrapper("ThrowNew");
600 DTRACE_PROBE3(hotspot_jni, ThrowNew__entry, env, clazz, message);
601 jint ret = JNI_OK;
602 DT_RETURN_MARK(ThrowNew, jint, (const jint&)ret);
603
604 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
605 Symbol* name = k->name();
606 Handle class_loader (THREAD, k->class_loader());
607 Handle protection_domain (THREAD, k->protection_domain());
608 THROW_MSG_LOADER_(name, (char *)message, class_loader, protection_domain, JNI_OK);
609 ShouldNotReachHere();
610 JNI_END
611
612
613 // JNI functions only transform a pending async exception to a synchronous
614 // exception in ExceptionOccurred and ExceptionCheck calls, since
615 // delivering an async exception in other places won't change the native
616 // code's control flow and would be harmful when native code further calls
617 // JNI functions with a pending exception. Async exception is also checked
618 // during the call, so ExceptionOccurred/ExceptionCheck won't return
619 // false but deliver the async exception at the very end during
620 // state transition.
621
622 static void jni_check_async_exceptions(JavaThread *thread) {
623 assert(thread == Thread::current(), "must be itself");
624 thread->check_and_handle_async_exceptions();
625 }
626
627 JNI_ENTRY_NO_PRESERVE(jthrowable, jni_ExceptionOccurred(JNIEnv *env))
628 JNIWrapper("ExceptionOccurred");
629 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__entry, env);
630 jni_check_async_exceptions(thread);
631 oop exception = thread->pending_exception();
632 jthrowable ret = (jthrowable) JNIHandles::make_local(env, exception);
633 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__return, ret);
634 return ret;
635 JNI_END
636
637
638 JNI_ENTRY_NO_PRESERVE(void, jni_ExceptionDescribe(JNIEnv *env))
639 JNIWrapper("ExceptionDescribe");
640 DTRACE_PROBE1(hotspot_jni, ExceptionDescribe__entry, env);
641 if (thread->has_pending_exception()) {
642 Handle ex(thread, thread->pending_exception());
643 thread->clear_pending_exception();
644 if (ex->is_a(SystemDictionary::ThreadDeath_klass())) {
645 // Don't print anything if we are being killed.
646 } else {
647 jio_fprintf(defaultStream::error_stream(), "Exception ");
648 if (thread != NULL && thread->threadObj() != NULL) {
649 ResourceMark rm(THREAD);
650 jio_fprintf(defaultStream::error_stream(),
651 "in thread \"%s\" ", thread->get_thread_name());
652 }
653 if (ex->is_a(SystemDictionary::Throwable_klass())) {
654 JavaValue result(T_VOID);
655 JavaCalls::call_virtual(&result,
656 ex,
657 KlassHandle(THREAD,
658 SystemDictionary::Throwable_klass()),
659 vmSymbols::printStackTrace_name(),
660 vmSymbols::void_method_signature(),
661 THREAD);
662 // If an exception is thrown in the call it gets thrown away. Not much
663 // we can do with it. The native code that calls this, does not check
664 // for the exception - hence, it might still be in the thread when DestroyVM gets
665 // called, potentially causing a few asserts to trigger - since no pending exception
666 // is expected.
667 CLEAR_PENDING_EXCEPTION;
668 } else {
669 ResourceMark rm(THREAD);
670 jio_fprintf(defaultStream::error_stream(),
671 ". Uncaught exception of type %s.",
672 Klass::cast(ex->klass())->external_name());
673 }
674 }
675 }
676 DTRACE_PROBE(hotspot_jni, ExceptionDescribe__return);
677 JNI_END
678
679
680 JNI_QUICK_ENTRY(void, jni_ExceptionClear(JNIEnv *env))
681 JNIWrapper("ExceptionClear");
682 DTRACE_PROBE1(hotspot_jni, ExceptionClear__entry, env);
683
684 // The jni code might be using this API to clear java thrown exception.
685 // So just mark jvmti thread exception state as exception caught.
686 JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state();
687 if (state != NULL && state->is_exception_detected()) {
688 state->set_exception_caught();
689 }
690 thread->clear_pending_exception();
691 DTRACE_PROBE(hotspot_jni, ExceptionClear__return);
692 JNI_END
693
694
695 JNI_ENTRY(void, jni_FatalError(JNIEnv *env, const char *msg))
696 JNIWrapper("FatalError");
697 DTRACE_PROBE2(hotspot_jni, FatalError__entry, env, msg);
698 tty->print_cr("FATAL ERROR in native method: %s", msg);
699 thread->print_stack();
700 os::abort(); // Dump core and abort
701 JNI_END
702
703
704 JNI_ENTRY(jint, jni_PushLocalFrame(JNIEnv *env, jint capacity))
705 JNIWrapper("PushLocalFrame");
706 DTRACE_PROBE2(hotspot_jni, PushLocalFrame__entry, env, capacity);
707 //%note jni_11
708 if (capacity < 0 && capacity > MAX_REASONABLE_LOCAL_CAPACITY) {
709 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, JNI_ERR);
710 return JNI_ERR;
711 }
712 JNIHandleBlock* old_handles = thread->active_handles();
713 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
714 assert(new_handles != NULL, "should not be NULL");
715 new_handles->set_pop_frame_link(old_handles);
716 thread->set_active_handles(new_handles);
717 jint ret = JNI_OK;
718 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, ret);
719 return ret;
720 JNI_END
721
722
723 JNI_ENTRY(jobject, jni_PopLocalFrame(JNIEnv *env, jobject result))
724 JNIWrapper("PopLocalFrame");
725 DTRACE_PROBE2(hotspot_jni, PopLocalFrame__entry, env, result);
726 //%note jni_11
727 Handle result_handle(thread, JNIHandles::resolve(result));
728 JNIHandleBlock* old_handles = thread->active_handles();
729 JNIHandleBlock* new_handles = old_handles->pop_frame_link();
730 if (new_handles != NULL) {
731 // As a sanity check we only release the handle blocks if the pop_frame_link is not NULL.
732 // This way code will still work if PopLocalFrame is called without a corresponding
733 // PushLocalFrame call. Note that we set the pop_frame_link to NULL explicitly, otherwise
734 // the release_block call will release the blocks.
735 thread->set_active_handles(new_handles);
736 old_handles->set_pop_frame_link(NULL); // clear link we won't release new_handles below
737 JNIHandleBlock::release_block(old_handles, thread); // may block
738 result = JNIHandles::make_local(thread, result_handle());
739 }
740 DTRACE_PROBE1(hotspot_jni, PopLocalFrame__return, result);
741 return result;
742 JNI_END
743
744
745 JNI_ENTRY(jobject, jni_NewGlobalRef(JNIEnv *env, jobject ref))
746 JNIWrapper("NewGlobalRef");
747 DTRACE_PROBE2(hotspot_jni, NewGlobalRef__entry, env, ref);
748 Handle ref_handle(thread, JNIHandles::resolve(ref));
749 jobject ret = JNIHandles::make_global(ref_handle);
750 DTRACE_PROBE1(hotspot_jni, NewGlobalRef__return, ret);
751 return ret;
752 JNI_END
753
754 // Must be JNI_ENTRY (with HandleMark)
755 JNI_ENTRY_NO_PRESERVE(void, jni_DeleteGlobalRef(JNIEnv *env, jobject ref))
756 JNIWrapper("DeleteGlobalRef");
757 DTRACE_PROBE2(hotspot_jni, DeleteGlobalRef__entry, env, ref);
758 JNIHandles::destroy_global(ref);
759 DTRACE_PROBE(hotspot_jni, DeleteGlobalRef__return);
760 JNI_END
761
762 JNI_QUICK_ENTRY(void, jni_DeleteLocalRef(JNIEnv *env, jobject obj))
763 JNIWrapper("DeleteLocalRef");
764 DTRACE_PROBE2(hotspot_jni, DeleteLocalRef__entry, env, obj);
765 JNIHandles::destroy_local(obj);
766 DTRACE_PROBE(hotspot_jni, DeleteLocalRef__return);
767 JNI_END
768
769 JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2))
770 JNIWrapper("IsSameObject");
771 DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2);
772 oop a = JNIHandles::resolve(r1);
773 oop b = JNIHandles::resolve(r2);
774 jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE;
775 DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret);
776 return ret;
777 JNI_END
778
779
780 JNI_ENTRY(jobject, jni_NewLocalRef(JNIEnv *env, jobject ref))
781 JNIWrapper("NewLocalRef");
782 DTRACE_PROBE2(hotspot_jni, NewLocalRef__entry, env, ref);
783 jobject ret = JNIHandles::make_local(env, JNIHandles::resolve(ref));
784 DTRACE_PROBE1(hotspot_jni, NewLocalRef__return, ret);
785 return ret;
786 JNI_END
787
788 JNI_LEAF(jint, jni_EnsureLocalCapacity(JNIEnv *env, jint capacity))
789 JNIWrapper("EnsureLocalCapacity");
790 DTRACE_PROBE2(hotspot_jni, EnsureLocalCapacity__entry, env, capacity);
791 jint ret;
792 if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) {
793 ret = JNI_OK;
794 } else {
795 ret = JNI_ERR;
796 }
797 DTRACE_PROBE1(hotspot_jni, EnsureLocalCapacity__return, ret);
798 return ret;
799 JNI_END
800
801 // Return the Handle Type
802 JNI_LEAF(jobjectRefType, jni_GetObjectRefType(JNIEnv *env, jobject obj))
803 JNIWrapper("GetObjectRefType");
804 DTRACE_PROBE2(hotspot_jni, GetObjectRefType__entry, env, obj);
805 jobjectRefType ret;
806 if (JNIHandles::is_local_handle(thread, obj) ||
807 JNIHandles::is_frame_handle(thread, obj))
808 ret = JNILocalRefType;
809 else if (JNIHandles::is_global_handle(obj))
810 ret = JNIGlobalRefType;
811 else if (JNIHandles::is_weak_global_handle(obj))
812 ret = JNIWeakGlobalRefType;
813 else
814 ret = JNIInvalidRefType;
815 DTRACE_PROBE1(hotspot_jni, GetObjectRefType__return, ret);
816 return ret;
817 JNI_END
818
819
820 class JNI_ArgumentPusher : public SignatureIterator {
821 protected:
822 JavaCallArguments* _arguments;
823
824 virtual void get_bool () = 0;
825 virtual void get_char () = 0;
826 virtual void get_short () = 0;
827 virtual void get_byte () = 0;
828 virtual void get_int () = 0;
829 virtual void get_long () = 0;
830 virtual void get_float () = 0;
831 virtual void get_double () = 0;
832 virtual void get_object () = 0;
833
834 JNI_ArgumentPusher(Symbol* signature) : SignatureIterator(signature) {
835 this->_return_type = T_ILLEGAL;
836 _arguments = NULL;
837 }
838
839 public:
840 virtual void iterate( uint64_t fingerprint ) = 0;
841
842 void set_java_argument_object(JavaCallArguments *arguments) { _arguments = arguments; }
843
844 inline void do_bool() { if (!is_return_type()) get_bool(); }
845 inline void do_char() { if (!is_return_type()) get_char(); }
846 inline void do_short() { if (!is_return_type()) get_short(); }
847 inline void do_byte() { if (!is_return_type()) get_byte(); }
848 inline void do_int() { if (!is_return_type()) get_int(); }
849 inline void do_long() { if (!is_return_type()) get_long(); }
850 inline void do_float() { if (!is_return_type()) get_float(); }
851 inline void do_double() { if (!is_return_type()) get_double(); }
852 inline void do_object(int begin, int end) { if (!is_return_type()) get_object(); }
853 inline void do_array(int begin, int end) { if (!is_return_type()) get_object(); } // do_array uses get_object -- there is no get_array
854 inline void do_void() { }
855
856 JavaCallArguments* arguments() { return _arguments; }
857 void push_receiver(Handle h) { _arguments->push_oop(h); }
858 };
859
860
861 class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher {
862 protected:
863 va_list _ap;
864
865 inline void get_bool() { _arguments->push_int(va_arg(_ap, jint)); } // bool is coerced to int when using va_arg
866 inline void get_char() { _arguments->push_int(va_arg(_ap, jint)); } // char is coerced to int when using va_arg
867 inline void get_short() { _arguments->push_int(va_arg(_ap, jint)); } // short is coerced to int when using va_arg
868 inline void get_byte() { _arguments->push_int(va_arg(_ap, jint)); } // byte is coerced to int when using va_arg
869 inline void get_int() { _arguments->push_int(va_arg(_ap, jint)); }
870
871 // each of these paths is exercized by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
872
873 inline void get_long() { _arguments->push_long(va_arg(_ap, jlong)); }
874 inline void get_float() { _arguments->push_float((jfloat)va_arg(_ap, jdouble)); } // float is coerced to double w/ va_arg
875 inline void get_double() { _arguments->push_double(va_arg(_ap, jdouble)); }
876 inline void get_object() { jobject l = va_arg(_ap, jobject);
877 _arguments->push_oop(Handle((oop *)l, false)); }
878
879 inline void set_ap(va_list rap) {
880 #ifdef va_copy
881 va_copy(_ap, rap);
882 #elif defined (__va_copy)
883 __va_copy(_ap, rap);
884 #else
885 _ap = rap;
886 #endif
887 }
888
889 public:
890 JNI_ArgumentPusherVaArg(Symbol* signature, va_list rap)
891 : JNI_ArgumentPusher(signature) {
892 set_ap(rap);
893 }
894 JNI_ArgumentPusherVaArg(jmethodID method_id, va_list rap)
895 : JNI_ArgumentPusher(JNIHandles::resolve_jmethod_id(method_id)->signature()) {
896 set_ap(rap);
897 }
898
899 // Optimized path if we have the bitvector form of signature
900 void iterate( uint64_t fingerprint ) {
901 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate();// Must be too many arguments
902 else {
903 _return_type = (BasicType)((fingerprint >> static_feature_size) &
904 result_feature_mask);
905
906 assert(fingerprint, "Fingerprint should not be 0");
907 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
908 while ( 1 ) {
909 switch ( fingerprint & parameter_feature_mask ) {
910 case bool_parm:
911 case char_parm:
912 case short_parm:
913 case byte_parm:
914 case int_parm:
915 get_int();
916 break;
917 case obj_parm:
918 get_object();
919 break;
920 case long_parm:
921 get_long();
922 break;
923 case float_parm:
924 get_float();
925 break;
926 case double_parm:
927 get_double();
928 break;
929 case done_parm:
930 return;
931 break;
932 default:
933 ShouldNotReachHere();
934 break;
935 }
936 fingerprint >>= parameter_feature_size;
937 }
938 }
939 }
940 };
941
942
943 class JNI_ArgumentPusherArray : public JNI_ArgumentPusher {
944 protected:
945 const jvalue *_ap;
946
947 inline void get_bool() { _arguments->push_int((jint)(_ap++)->z); }
948 inline void get_char() { _arguments->push_int((jint)(_ap++)->c); }
949 inline void get_short() { _arguments->push_int((jint)(_ap++)->s); }
950 inline void get_byte() { _arguments->push_int((jint)(_ap++)->b); }
951 inline void get_int() { _arguments->push_int((jint)(_ap++)->i); }
952
953 inline void get_long() { _arguments->push_long((_ap++)->j); }
954 inline void get_float() { _arguments->push_float((_ap++)->f); }
955 inline void get_double() { _arguments->push_double((_ap++)->d);}
956 inline void get_object() { _arguments->push_oop(Handle((oop *)(_ap++)->l, false)); }
957
958 inline void set_ap(const jvalue *rap) { _ap = rap; }
959
960 public:
961 JNI_ArgumentPusherArray(Symbol* signature, const jvalue *rap)
962 : JNI_ArgumentPusher(signature) {
963 set_ap(rap);
964 }
965 JNI_ArgumentPusherArray(jmethodID method_id, const jvalue *rap)
966 : JNI_ArgumentPusher(JNIHandles::resolve_jmethod_id(method_id)->signature()) {
967 set_ap(rap);
968 }
969
970 // Optimized path if we have the bitvector form of signature
971 void iterate( uint64_t fingerprint ) {
972 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate(); // Must be too many arguments
973 else {
974 _return_type = (BasicType)((fingerprint >> static_feature_size) &
975 result_feature_mask);
976 assert(fingerprint, "Fingerprint should not be 0");
977 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
978 while ( 1 ) {
979 switch ( fingerprint & parameter_feature_mask ) {
980 case bool_parm:
981 get_bool();
982 break;
983 case char_parm:
984 get_char();
985 break;
986 case short_parm:
987 get_short();
988 break;
989 case byte_parm:
990 get_byte();
991 break;
992 case int_parm:
993 get_int();
994 break;
995 case obj_parm:
996 get_object();
997 break;
998 case long_parm:
999 get_long();
1000 break;
1001 case float_parm:
1002 get_float();
1003 break;
1004 case double_parm:
1005 get_double();
1006 break;
1007 case done_parm:
1008 return;
1009 break;
1010 default:
1011 ShouldNotReachHere();
1012 break;
1013 }
1014 fingerprint >>= parameter_feature_size;
1015 }
1016 }
1017 }
1018 };
1019
1020
1021 enum JNICallType {
1022 JNI_STATIC,
1023 JNI_VIRTUAL,
1024 JNI_NONVIRTUAL
1025 };
1026
1027 static methodHandle jni_resolve_interface_call(Handle recv, methodHandle method, TRAPS) {
1028 assert(!method.is_null() , "method should not be null");
1029
1030 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
1031 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
1032 KlassHandle spec_klass (THREAD, method->method_holder());
1033 Symbol* name = method->name();
1034 Symbol* signature = method->signature();
1035 CallInfo info;
1036 LinkResolver::resolve_interface_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
1037 return info.selected_method();
1038 }
1039
1040 static methodHandle jni_resolve_virtual_call(Handle recv, methodHandle method, TRAPS) {
1041 assert(!method.is_null() , "method should not be null");
1042
1043 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
1044 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
1045 KlassHandle spec_klass (THREAD, method->method_holder());
1046 Symbol* name = method->name();
1047 Symbol* signature = method->signature();
1048 CallInfo info;
1049 LinkResolver::resolve_virtual_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
1050 return info.selected_method();
1051 }
1052
1053
1054
1055 static void jni_invoke_static(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
1056 methodHandle method(THREAD, JNIHandles::resolve_jmethod_id(method_id));
1057
1058 // Create object to hold arguments for the JavaCall, and associate it with
1059 // the jni parser
1060 ResourceMark rm(THREAD);
1061 int number_of_parameters = method->size_of_parameters();
1062 JavaCallArguments java_args(number_of_parameters);
1063 args->set_java_argument_object(&java_args);
1064
1065 assert(method->is_static(), "method should be static");
1066
1067 // Fill out JavaCallArguments object
1068 args->iterate( Fingerprinter(method).fingerprint() );
1069 // Initialize result type
1070 result->set_type(args->get_ret_type());
1071
1072 // Invoke the method. Result is returned as oop.
1073 JavaCalls::call(result, method, &java_args, CHECK);
1074
1075 // Convert result
1076 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1077 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1078 }
1079 }
1080
1081
1082 static void jni_invoke_nonstatic(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
1083 oop recv = JNIHandles::resolve(receiver);
1084 if (recv == NULL) {
1085 THROW(vmSymbols::java_lang_NullPointerException());
1086 }
1087 Handle h_recv(THREAD, recv);
1088
1089 int number_of_parameters;
1090 methodOop selected_method;
1091 {
1092 methodOop m = JNIHandles::resolve_jmethod_id(method_id);
1093 number_of_parameters = m->size_of_parameters();
1094 klassOop holder = m->method_holder();
1095 if (!(Klass::cast(holder))->is_interface()) {
1096 // non-interface call -- for that little speed boost, don't handlize
1097 debug_only(No_Safepoint_Verifier nosafepoint;)
1098 if (call_type == JNI_VIRTUAL) {
1099 // jni_GetMethodID makes sure class is linked and initialized
1100 // so m should have a valid vtable index.
1101 int vtbl_index = m->vtable_index();
1102 if (vtbl_index != methodOopDesc::nonvirtual_vtable_index) {
1103 klassOop k = h_recv->klass();
1104 // k might be an arrayKlassOop but all vtables start at
1105 // the same place. The cast is to avoid virtual call and assertion.
1106 instanceKlass *ik = (instanceKlass*)k->klass_part();
1107 selected_method = ik->method_at_vtable(vtbl_index);
1108 } else {
1109 // final method
1110 selected_method = m;
1111 }
1112 } else {
1113 // JNI_NONVIRTUAL call
1114 selected_method = m;
1115 }
1116 } else {
1117 // interface call
1118 KlassHandle h_holder(THREAD, holder);
1119
1120 int itbl_index = m->cached_itable_index();
1121 if (itbl_index == -1) {
1122 itbl_index = klassItable::compute_itable_index(m);
1123 m->set_cached_itable_index(itbl_index);
1124 // the above may have grabbed a lock, 'm' and anything non-handlized can't be used again
1125 }
1126 klassOop k = h_recv->klass();
1127 selected_method = instanceKlass::cast(k)->method_at_itable(h_holder(), itbl_index, CHECK);
1128 }
1129 }
1130
1131 methodHandle method(THREAD, selected_method);
1132
1133 // Create object to hold arguments for the JavaCall, and associate it with
1134 // the jni parser
1135 ResourceMark rm(THREAD);
1136 JavaCallArguments java_args(number_of_parameters);
1137 args->set_java_argument_object(&java_args);
1138
1139 // handle arguments
1140 assert(!method->is_static(), "method should not be static");
1141 args->push_receiver(h_recv); // Push jobject handle
1142
1143 // Fill out JavaCallArguments object
1144 args->iterate( Fingerprinter(method).fingerprint() );
1145 // Initialize result type
1146 result->set_type(args->get_ret_type());
1147
1148 // Invoke the method. Result is returned as oop.
1149 JavaCalls::call(result, method, &java_args, CHECK);
1150
1151 // Convert result
1152 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1153 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1154 }
1155 }
1156
1157
1158 static instanceOop alloc_object(jclass clazz, TRAPS) {
1159 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1160 Klass::cast(k())->check_valid_for_instantiation(false, CHECK_NULL);
1161 instanceKlass::cast(k())->initialize(CHECK_NULL);
1162 instanceOop ih = instanceKlass::cast(k())->allocate_instance(THREAD);
1163 return ih;
1164 }
1165
1166 DT_RETURN_MARK_DECL(AllocObject, jobject);
1167
1168 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
1169 JNIWrapper("AllocObject");
1170
1171 DTRACE_PROBE2(hotspot_jni, AllocObject__entry, env, clazz);
1172 jobject ret = NULL;
1173 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
1174
1175 instanceOop i = alloc_object(clazz, CHECK_NULL);
1176 ret = JNIHandles::make_local(env, i);
1177 return ret;
1178 JNI_END
1179
1180 DT_RETURN_MARK_DECL(NewObjectA, jobject);
1181
1182 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
1183 JNIWrapper("NewObjectA");
1184 DTRACE_PROBE3(hotspot_jni, NewObjectA__entry, env, clazz, methodID);
1185 jobject obj = NULL;
1186 DT_RETURN_MARK(NewObjectA, jobject, (const jobject)obj);
1187
1188 instanceOop i = alloc_object(clazz, CHECK_NULL);
1189 obj = JNIHandles::make_local(env, i);
1190 JavaValue jvalue(T_VOID);
1191 JNI_ArgumentPusherArray ap(methodID, args);
1192 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1193 return obj;
1194 JNI_END
1195
1196 DT_RETURN_MARK_DECL(NewObjectV, jobject);
1197
1198 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
1199 JNIWrapper("NewObjectV");
1200 DTRACE_PROBE3(hotspot_jni, NewObjectV__entry, env, clazz, methodID);
1201 jobject obj = NULL;
1202 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
1203
1204 instanceOop i = alloc_object(clazz, CHECK_NULL);
1205 obj = JNIHandles::make_local(env, i);
1206 JavaValue jvalue(T_VOID);
1207 JNI_ArgumentPusherVaArg ap(methodID, args);
1208 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1209 return obj;
1210 JNI_END
1211
1212 DT_RETURN_MARK_DECL(NewObject, jobject);
1213
1214 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1215 JNIWrapper("NewObject");
1216 DTRACE_PROBE3(hotspot_jni, NewObject__entry, env, clazz, methodID);
1217 jobject obj = NULL;
1218 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1219
1220 instanceOop i = alloc_object(clazz, CHECK_NULL);
1221 obj = JNIHandles::make_local(env, i);
1222 va_list args;
1223 va_start(args, methodID);
1224 JavaValue jvalue(T_VOID);
1225 JNI_ArgumentPusherVaArg ap(methodID, args);
1226 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1227 va_end(args);
1228 return obj;
1229 JNI_END
1230
1231
1232 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1233 JNIWrapper("GetObjectClass");
1234 DTRACE_PROBE2(hotspot_jni, GetObjectClass__entry, env, obj);
1235 klassOop k = JNIHandles::resolve_non_null(obj)->klass();
1236 jclass ret =
1237 (jclass) JNIHandles::make_local(env, Klass::cast(k)->java_mirror());
1238 DTRACE_PROBE1(hotspot_jni, GetObjectClass__return, ret);
1239 return ret;
1240 JNI_END
1241
1242 JNI_QUICK_ENTRY(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1243 JNIWrapper("IsInstanceOf");
1244 DTRACE_PROBE3(hotspot_jni, IsInstanceOf__entry, env, obj, clazz);
1245 jboolean ret = JNI_TRUE;
1246 if (obj != NULL) {
1247 ret = JNI_FALSE;
1248 klassOop k = java_lang_Class::as_klassOop(
1249 JNIHandles::resolve_non_null(clazz));
1250 if (k != NULL) {
1251 ret = JNIHandles::resolve_non_null(obj)->is_a(k) ? JNI_TRUE : JNI_FALSE;
1252 }
1253 }
1254 DTRACE_PROBE1(hotspot_jni, IsInstanceOf__return, ret);
1255 return ret;
1256 JNI_END
1257
1258
1259 static jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name_str,
1260 const char *sig, bool is_static, TRAPS) {
1261 // %%%% This code should probably just call into a method in the LinkResolver
1262 //
1263 // The class should have been loaded (we have an instance of the class
1264 // passed in) so the method and signature should already be in the symbol
1265 // table. If they're not there, the method doesn't exist.
1266 const char *name_to_probe = (name_str == NULL)
1267 ? vmSymbols::object_initializer_name()->as_C_string()
1268 : name_str;
1269 TempNewSymbol name = SymbolTable::probe(name_to_probe, (int)strlen(name_to_probe));
1270 TempNewSymbol signature = SymbolTable::probe(sig, (int)strlen(sig));
1271
1272 if (name == NULL || signature == NULL) {
1273 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1274 }
1275
1276 // Throw a NoSuchMethodError exception if we have an instance of a
1277 // primitive java.lang.Class
1278 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(clazz))) {
1279 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1280 }
1281
1282 KlassHandle klass(THREAD,
1283 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1284
1285 // Make sure class is linked and initialized before handing id's out to
1286 // methodOops.
1287 Klass::cast(klass())->initialize(CHECK_NULL);
1288
1289 methodOop m;
1290 if (name == vmSymbols::object_initializer_name() ||
1291 name == vmSymbols::class_initializer_name()) {
1292 // Never search superclasses for constructors
1293 if (klass->oop_is_instance()) {
1294 m = instanceKlass::cast(klass())->find_method(name, signature);
1295 } else {
1296 m = NULL;
1297 }
1298 } else {
1299 m = klass->lookup_method(name, signature);
1300 // Look up interfaces
1301 if (m == NULL && klass->oop_is_instance()) {
1302 m = instanceKlass::cast(klass())->lookup_method_in_all_interfaces(name,
1303 signature);
1304 }
1305 }
1306 if (m == NULL || (m->is_static() != is_static)) {
1307 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1308 }
1309 return m->jmethod_id();
1310 }
1311
1312
1313 JNI_ENTRY(jmethodID, jni_GetMethodID(JNIEnv *env, jclass clazz,
1314 const char *name, const char *sig))
1315 JNIWrapper("GetMethodID");
1316 DTRACE_PROBE4(hotspot_jni, GetMethodID__entry, env, clazz, name, sig);
1317 jmethodID ret = get_method_id(env, clazz, name, sig, false, thread);
1318 DTRACE_PROBE1(hotspot_jni, GetMethodID__return, ret);
1319 return ret;
1320 JNI_END
1321
1322
1323 JNI_ENTRY(jmethodID, jni_GetStaticMethodID(JNIEnv *env, jclass clazz,
1324 const char *name, const char *sig))
1325 JNIWrapper("GetStaticMethodID");
1326 DTRACE_PROBE4(hotspot_jni, GetStaticMethodID__entry, env, clazz, name, sig);
1327 jmethodID ret = get_method_id(env, clazz, name, sig, true, thread);
1328 DTRACE_PROBE1(hotspot_jni, GetStaticMethodID__return, ret);
1329 return ret;
1330 JNI_END
1331
1332
1333
1334 //
1335 // Calling Methods
1336 //
1337
1338
1339 #define DEFINE_CALLMETHOD(ResultType, Result, Tag) \
1340 \
1341 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##Method, ResultType);\
1342 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodV, ResultType);\
1343 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodA, ResultType);\
1344 \
1345 JNI_ENTRY(ResultType, \
1346 jni_Call##Result##Method(JNIEnv *env, jobject obj, jmethodID methodID, ...)) \
1347 JNIWrapper("Call" XSTR(Result) "Method"); \
1348 \
1349 DTRACE_PROBE3(hotspot_jni, Call##Result##Method__entry, env, obj, methodID);\
1350 ResultType ret = 0;\
1351 DT_RETURN_MARK_FOR(Result, Call##Result##Method, ResultType, \
1352 (const ResultType&)ret);\
1353 \
1354 va_list args; \
1355 va_start(args, methodID); \
1356 JavaValue jvalue(Tag); \
1357 JNI_ArgumentPusherVaArg ap(methodID, args); \
1358 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1359 va_end(args); \
1360 ret = jvalue.get_##ResultType(); \
1361 return ret;\
1362 JNI_END \
1363 \
1364 \
1365 JNI_ENTRY(ResultType, \
1366 jni_Call##Result##MethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) \
1367 JNIWrapper("Call" XSTR(Result) "MethodV"); \
1368 \
1369 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodV__entry, env, obj, methodID);\
1370 ResultType ret = 0;\
1371 DT_RETURN_MARK_FOR(Result, Call##Result##MethodV, ResultType, \
1372 (const ResultType&)ret);\
1373 \
1374 JavaValue jvalue(Tag); \
1375 JNI_ArgumentPusherVaArg ap(methodID, args); \
1376 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1377 ret = jvalue.get_##ResultType(); \
1378 return ret;\
1379 JNI_END \
1380 \
1381 \
1382 JNI_ENTRY(ResultType, \
1383 jni_Call##Result##MethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) \
1384 JNIWrapper("Call" XSTR(Result) "MethodA"); \
1385 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodA__entry, env, obj, methodID);\
1386 ResultType ret = 0;\
1387 DT_RETURN_MARK_FOR(Result, Call##Result##MethodA, ResultType, \
1388 (const ResultType&)ret);\
1389 \
1390 JavaValue jvalue(Tag); \
1391 JNI_ArgumentPusherArray ap(methodID, args); \
1392 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1393 ret = jvalue.get_##ResultType(); \
1394 return ret;\
1395 JNI_END
1396
1397 // the runtime type of subword integral basic types is integer
1398 DEFINE_CALLMETHOD(jboolean, Boolean, T_BOOLEAN)
1399 DEFINE_CALLMETHOD(jbyte, Byte, T_BYTE)
1400 DEFINE_CALLMETHOD(jchar, Char, T_CHAR)
1401 DEFINE_CALLMETHOD(jshort, Short, T_SHORT)
1402
1403 DEFINE_CALLMETHOD(jobject, Object, T_OBJECT)
1404 DEFINE_CALLMETHOD(jint, Int, T_INT)
1405 DEFINE_CALLMETHOD(jlong, Long, T_LONG)
1406 DEFINE_CALLMETHOD(jfloat, Float, T_FLOAT)
1407 DEFINE_CALLMETHOD(jdouble, Double, T_DOUBLE)
1408
1409 DT_VOID_RETURN_MARK_DECL(CallVoidMethod);
1410 DT_VOID_RETURN_MARK_DECL(CallVoidMethodV);
1411 DT_VOID_RETURN_MARK_DECL(CallVoidMethodA);
1412
1413 JNI_ENTRY(void, jni_CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...))
1414 JNIWrapper("CallVoidMethod");
1415 DTRACE_PROBE3(hotspot_jni, CallVoidMethod__entry, env, obj, methodID);
1416 DT_VOID_RETURN_MARK(CallVoidMethod);
1417
1418 va_list args;
1419 va_start(args, methodID);
1420 JavaValue jvalue(T_VOID);
1421 JNI_ArgumentPusherVaArg ap(methodID, args);
1422 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1423 va_end(args);
1424 JNI_END
1425
1426
1427 JNI_ENTRY(void, jni_CallVoidMethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args))
1428 JNIWrapper("CallVoidMethodV");
1429 DTRACE_PROBE3(hotspot_jni, CallVoidMethodV__entry, env, obj, methodID);
1430 DT_VOID_RETURN_MARK(CallVoidMethodV);
1431
1432 JavaValue jvalue(T_VOID);
1433 JNI_ArgumentPusherVaArg ap(methodID, args);
1434 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1435 JNI_END
1436
1437
1438 JNI_ENTRY(void, jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args))
1439 JNIWrapper("CallVoidMethodA");
1440 DTRACE_PROBE3(hotspot_jni, CallVoidMethodA__entry, env, obj, methodID);
1441 DT_VOID_RETURN_MARK(CallVoidMethodA);
1442
1443 JavaValue jvalue(T_VOID);
1444 JNI_ArgumentPusherArray ap(methodID, args);
1445 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1446 JNI_END
1447
1448
1449 #define DEFINE_CALLNONVIRTUALMETHOD(ResultType, Result, Tag) \
1450 \
1451 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##Method, ResultType);\
1452 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodV, ResultType);\
1453 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodA, ResultType);\
1454 \
1455 JNI_ENTRY(ResultType, \
1456 jni_CallNonvirtual##Result##Method(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) \
1457 JNIWrapper("CallNonvitual" XSTR(Result) "Method"); \
1458 \
1459 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##Method__entry, env, obj, cls, methodID);\
1460 ResultType ret;\
1461 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##Method, ResultType, \
1462 (const ResultType&)ret);\
1463 \
1464 va_list args; \
1465 va_start(args, methodID); \
1466 JavaValue jvalue(Tag); \
1467 JNI_ArgumentPusherVaArg ap(methodID, args); \
1468 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1469 va_end(args); \
1470 ret = jvalue.get_##ResultType(); \
1471 return ret;\
1472 JNI_END \
1473 \
1474 JNI_ENTRY(ResultType, \
1475 jni_CallNonvirtual##Result##MethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) \
1476 JNIWrapper("CallNonvitual" XSTR(Result) "#MethodV"); \
1477 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodV__entry, env, obj, cls, methodID);\
1478 ResultType ret;\
1479 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodV, ResultType, \
1480 (const ResultType&)ret);\
1481 \
1482 JavaValue jvalue(Tag); \
1483 JNI_ArgumentPusherVaArg ap(methodID, args); \
1484 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1485 ret = jvalue.get_##ResultType(); \
1486 return ret;\
1487 JNI_END \
1488 \
1489 JNI_ENTRY(ResultType, \
1490 jni_CallNonvirtual##Result##MethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) \
1491 JNIWrapper("CallNonvitual" XSTR(Result) "MethodA"); \
1492 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodA__entry, env, obj, cls, methodID);\
1493 ResultType ret;\
1494 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodA, ResultType, \
1495 (const ResultType&)ret);\
1496 \
1497 JavaValue jvalue(Tag); \
1498 JNI_ArgumentPusherArray ap(methodID, args); \
1499 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1500 ret = jvalue.get_##ResultType(); \
1501 return ret;\
1502 JNI_END
1503
1504 // the runtime type of subword integral basic types is integer
1505 DEFINE_CALLNONVIRTUALMETHOD(jboolean, Boolean, T_BOOLEAN)
1506 DEFINE_CALLNONVIRTUALMETHOD(jbyte, Byte, T_BYTE)
1507 DEFINE_CALLNONVIRTUALMETHOD(jchar, Char, T_CHAR)
1508 DEFINE_CALLNONVIRTUALMETHOD(jshort, Short, T_SHORT)
1509
1510 DEFINE_CALLNONVIRTUALMETHOD(jobject, Object, T_OBJECT)
1511 DEFINE_CALLNONVIRTUALMETHOD(jint, Int, T_INT)
1512 DEFINE_CALLNONVIRTUALMETHOD(jlong, Long, T_LONG)
1513 DEFINE_CALLNONVIRTUALMETHOD(jfloat, Float, T_FLOAT)
1514 DEFINE_CALLNONVIRTUALMETHOD(jdouble, Double, T_DOUBLE)
1515
1516
1517 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethod);
1518 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodV);
1519 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodA);
1520
1521 JNI_ENTRY(void, jni_CallNonvirtualVoidMethod(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...))
1522 JNIWrapper("CallNonvirtualVoidMethod");
1523
1524 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethod__entry,
1525 env, obj, cls, methodID);
1526 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethod);
1527
1528 va_list args;
1529 va_start(args, methodID);
1530 JavaValue jvalue(T_VOID);
1531 JNI_ArgumentPusherVaArg ap(methodID, args);
1532 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1533 va_end(args);
1534 JNI_END
1535
1536
1537 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args))
1538 JNIWrapper("CallNonvirtualVoidMethodV");
1539
1540 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodV__entry,
1541 env, obj, cls, methodID);
1542 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodV);
1543
1544 JavaValue jvalue(T_VOID);
1545 JNI_ArgumentPusherVaArg ap(methodID, args);
1546 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1547 JNI_END
1548
1549
1550 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args))
1551 JNIWrapper("CallNonvirtualVoidMethodA");
1552 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodA__entry,
1553 env, obj, cls, methodID);
1554 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodA);
1555 JavaValue jvalue(T_VOID);
1556 JNI_ArgumentPusherArray ap(methodID, args);
1557 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1558 JNI_END
1559
1560
1561 #define DEFINE_CALLSTATICMETHOD(ResultType, Result, Tag) \
1562 \
1563 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##Method, ResultType);\
1564 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodV, ResultType);\
1565 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodA, ResultType);\
1566 \
1567 JNI_ENTRY(ResultType, \
1568 jni_CallStatic##Result##Method(JNIEnv *env, jclass cls, jmethodID methodID, ...)) \
1569 JNIWrapper("CallStatic" XSTR(Result) "Method"); \
1570 \
1571 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##Method__entry, env, cls, methodID);\
1572 ResultType ret = 0;\
1573 DT_RETURN_MARK_FOR(Result, CallStatic##Result##Method, ResultType, \
1574 (const ResultType&)ret);\
1575 \
1576 va_list args; \
1577 va_start(args, methodID); \
1578 JavaValue jvalue(Tag); \
1579 JNI_ArgumentPusherVaArg ap(methodID, args); \
1580 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1581 va_end(args); \
1582 ret = jvalue.get_##ResultType(); \
1583 return ret;\
1584 JNI_END \
1585 \
1586 JNI_ENTRY(ResultType, \
1587 jni_CallStatic##Result##MethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) \
1588 JNIWrapper("CallStatic" XSTR(Result) "MethodV"); \
1589 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodV__entry, env, cls, methodID);\
1590 ResultType ret = 0;\
1591 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodV, ResultType, \
1592 (const ResultType&)ret);\
1593 \
1594 JavaValue jvalue(Tag); \
1595 JNI_ArgumentPusherVaArg ap(methodID, args); \
1596 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1597 ret = jvalue.get_##ResultType(); \
1598 return ret;\
1599 JNI_END \
1600 \
1601 JNI_ENTRY(ResultType, \
1602 jni_CallStatic##Result##MethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) \
1603 JNIWrapper("CallStatic" XSTR(Result) "MethodA"); \
1604 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodA__entry, env, cls, methodID);\
1605 ResultType ret = 0;\
1606 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodA, ResultType, \
1607 (const ResultType&)ret);\
1608 \
1609 JavaValue jvalue(Tag); \
1610 JNI_ArgumentPusherArray ap(methodID, args); \
1611 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1612 ret = jvalue.get_##ResultType(); \
1613 return ret;\
1614 JNI_END
1615
1616 // the runtime type of subword integral basic types is integer
1617 DEFINE_CALLSTATICMETHOD(jboolean, Boolean, T_BOOLEAN)
1618 DEFINE_CALLSTATICMETHOD(jbyte, Byte, T_BYTE)
1619 DEFINE_CALLSTATICMETHOD(jchar, Char, T_CHAR)
1620 DEFINE_CALLSTATICMETHOD(jshort, Short, T_SHORT)
1621
1622 DEFINE_CALLSTATICMETHOD(jobject, Object, T_OBJECT)
1623 DEFINE_CALLSTATICMETHOD(jint, Int, T_INT)
1624 DEFINE_CALLSTATICMETHOD(jlong, Long, T_LONG)
1625 DEFINE_CALLSTATICMETHOD(jfloat, Float, T_FLOAT)
1626 DEFINE_CALLSTATICMETHOD(jdouble, Double, T_DOUBLE)
1627
1628
1629 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethod);
1630 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodV);
1631 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodA);
1632
1633 JNI_ENTRY(void, jni_CallStaticVoidMethod(JNIEnv *env, jclass cls, jmethodID methodID, ...))
1634 JNIWrapper("CallStaticVoidMethod");
1635 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethod__entry, env, cls, methodID);
1636 DT_VOID_RETURN_MARK(CallStaticVoidMethod);
1637
1638 va_list args;
1639 va_start(args, methodID);
1640 JavaValue jvalue(T_VOID);
1641 JNI_ArgumentPusherVaArg ap(methodID, args);
1642 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1643 va_end(args);
1644 JNI_END
1645
1646
1647 JNI_ENTRY(void, jni_CallStaticVoidMethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args))
1648 JNIWrapper("CallStaticVoidMethodV");
1649 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodV__entry, env, cls, methodID);
1650 DT_VOID_RETURN_MARK(CallStaticVoidMethodV);
1651
1652 JavaValue jvalue(T_VOID);
1653 JNI_ArgumentPusherVaArg ap(methodID, args);
1654 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1655 JNI_END
1656
1657
1658 JNI_ENTRY(void, jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args))
1659 JNIWrapper("CallStaticVoidMethodA");
1660 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodA__entry, env, cls, methodID);
1661 DT_VOID_RETURN_MARK(CallStaticVoidMethodA);
1662
1663 JavaValue jvalue(T_VOID);
1664 JNI_ArgumentPusherArray ap(methodID, args);
1665 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1666 JNI_END
1667
1668
1669 //
1670 // Accessing Fields
1671 //
1672
1673
1674 DT_RETURN_MARK_DECL(GetFieldID, jfieldID);
1675
1676 JNI_ENTRY(jfieldID, jni_GetFieldID(JNIEnv *env, jclass clazz,
1677 const char *name, const char *sig))
1678 JNIWrapper("GetFieldID");
1679 DTRACE_PROBE4(hotspot_jni, GetFieldID__entry, env, clazz, name, sig);
1680 jfieldID ret = 0;
1681 DT_RETURN_MARK(GetFieldID, jfieldID, (const jfieldID&)ret);
1682
1683 // The class should have been loaded (we have an instance of the class
1684 // passed in) so the field and signature should already be in the symbol
1685 // table. If they're not there, the field doesn't exist.
1686 TempNewSymbol fieldname = SymbolTable::probe(name, (int)strlen(name));
1687 TempNewSymbol signame = SymbolTable::probe(sig, (int)strlen(sig));
1688 if (fieldname == NULL || signame == NULL) {
1689 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1690 }
1691 KlassHandle k(THREAD,
1692 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1693 // Make sure class is initialized before handing id's out to fields
1694 Klass::cast(k())->initialize(CHECK_NULL);
1695
1696 fieldDescriptor fd;
1697 if (!Klass::cast(k())->oop_is_instance() ||
1698 !instanceKlass::cast(k())->find_field(fieldname, signame, false, &fd)) {
1699 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1700 }
1701
1702 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1703 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1704 ret = jfieldIDWorkaround::to_instance_jfieldID(k(), fd.offset());
1705 return ret;
1706 JNI_END
1707
1708
1709 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1710 JNIWrapper("GetObjectField");
1711 DTRACE_PROBE3(hotspot_jni, GetObjectField__entry, env, obj, fieldID);
1712 oop o = JNIHandles::resolve_non_null(obj);
1713 klassOop k = o->klass();
1714 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1715 // Keep JVMTI addition small and only check enabled flag here.
1716 // jni_GetField_probe() assumes that is okay to create handles.
1717 if (JvmtiExport::should_post_field_access()) {
1718 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1719 }
1720 jobject ret = JNIHandles::make_local(env, o->obj_field(offset));
1721 #ifndef SERIALGC
1722 // If G1 is enabled and we are accessing the value of the referent
1723 // field in a reference object then we need to register a non-null
1724 // referent with the SATB barrier.
1725 if (UseG1GC) {
1726 bool needs_barrier = false;
1727
1728 if (ret != NULL &&
1729 offset == java_lang_ref_Reference::referent_offset &&
1730 instanceKlass::cast(k)->reference_type() != REF_NONE) {
1731 assert(instanceKlass::cast(k)->is_subclass_of(SystemDictionary::Reference_klass()), "sanity");
1732 needs_barrier = true;
1733 }
1734
1735 if (needs_barrier) {
1736 oop referent = JNIHandles::resolve(ret);
1737 G1SATBCardTableModRefBS::enqueue(referent);
1738 }
1739 }
1740 #endif // SERIALGC
1741 DTRACE_PROBE1(hotspot_jni, GetObjectField__return, ret);
1742 return ret;
1743 JNI_END
1744
1745
1746 #define DEFINE_GETFIELD(Return,Fieldname,Result) \
1747 \
1748 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return);\
1749 \
1750 JNI_QUICK_ENTRY(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1751 JNIWrapper("Get" XSTR(Result) "Field"); \
1752 \
1753 DTRACE_PROBE3(hotspot_jni, Get##Result##Field__entry, env, obj, fieldID);\
1754 Return ret = 0;\
1755 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1756 \
1757 oop o = JNIHandles::resolve_non_null(obj); \
1758 klassOop k = o->klass(); \
1759 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1760 /* Keep JVMTI addition small and only check enabled flag here. */ \
1761 /* jni_GetField_probe_nh() assumes that is not okay to create handles */ \
1762 /* and creates a ResetNoHandleMark. */ \
1763 if (JvmtiExport::should_post_field_access()) { \
1764 o = JvmtiExport::jni_GetField_probe_nh(thread, obj, o, k, fieldID, false); \
1765 } \
1766 ret = o->Fieldname##_field(offset); \
1767 return ret; \
1768 JNI_END
1769
1770 DEFINE_GETFIELD(jboolean, bool, Boolean)
1771 DEFINE_GETFIELD(jbyte, byte, Byte)
1772 DEFINE_GETFIELD(jchar, char, Char)
1773 DEFINE_GETFIELD(jshort, short, Short)
1774 DEFINE_GETFIELD(jint, int, Int)
1775 DEFINE_GETFIELD(jlong, long, Long)
1776 DEFINE_GETFIELD(jfloat, float, Float)
1777 DEFINE_GETFIELD(jdouble, double, Double)
1778
1779 address jni_GetBooleanField_addr() {
1780 return (address)jni_GetBooleanField;
1781 }
1782 address jni_GetByteField_addr() {
1783 return (address)jni_GetByteField;
1784 }
1785 address jni_GetCharField_addr() {
1786 return (address)jni_GetCharField;
1787 }
1788 address jni_GetShortField_addr() {
1789 return (address)jni_GetShortField;
1790 }
1791 address jni_GetIntField_addr() {
1792 return (address)jni_GetIntField;
1793 }
1794 address jni_GetLongField_addr() {
1795 return (address)jni_GetLongField;
1796 }
1797 address jni_GetFloatField_addr() {
1798 return (address)jni_GetFloatField;
1799 }
1800 address jni_GetDoubleField_addr() {
1801 return (address)jni_GetDoubleField;
1802 }
1803
1804 JNI_QUICK_ENTRY(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1805 JNIWrapper("SetObjectField");
1806 DTRACE_PROBE4(hotspot_jni, SetObjectField__entry, env, obj, fieldID, value);
1807 oop o = JNIHandles::resolve_non_null(obj);
1808 klassOop k = o->klass();
1809 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1810 // Keep JVMTI addition small and only check enabled flag here.
1811 // jni_SetField_probe_nh() assumes that is not okay to create handles
1812 // and creates a ResetNoHandleMark.
1813 if (JvmtiExport::should_post_field_modification()) {
1814 jvalue field_value;
1815 field_value.l = value;
1816 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, 'L', (jvalue *)&field_value);
1817 }
1818 o->obj_field_put(offset, JNIHandles::resolve(value));
1819 DTRACE_PROBE(hotspot_jni, SetObjectField__return);
1820 JNI_END
1821
1822 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType) \
1823 \
1824 JNI_QUICK_ENTRY(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1825 JNIWrapper("Set" XSTR(Result) "Field"); \
1826 \
1827 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, Set##Result##Field__entry, \
1828 ( JNIEnv*, jobject, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1829 HS_DTRACE_PROBE_N(hotspot_jni, Set##Result##Field__entry, \
1830 ( env, obj, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1831 \
1832 oop o = JNIHandles::resolve_non_null(obj); \
1833 klassOop k = o->klass(); \
1834 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1835 /* Keep JVMTI addition small and only check enabled flag here. */ \
1836 /* jni_SetField_probe_nh() assumes that is not okay to create handles */ \
1837 /* and creates a ResetNoHandleMark. */ \
1838 if (JvmtiExport::should_post_field_modification()) { \
1839 jvalue field_value; \
1840 field_value.unionType = value; \
1841 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \
1842 } \
1843 o->Fieldname##_field_put(offset, value); \
1844 DTRACE_PROBE(hotspot_jni, Set##Result##Field__return);\
1845 JNI_END
1846
1847 DEFINE_SETFIELD(jboolean, bool, Boolean, 'Z', z)
1848 DEFINE_SETFIELD(jbyte, byte, Byte, 'B', b)
1849 DEFINE_SETFIELD(jchar, char, Char, 'C', c)
1850 DEFINE_SETFIELD(jshort, short, Short, 'S', s)
1851 DEFINE_SETFIELD(jint, int, Int, 'I', i)
1852 DEFINE_SETFIELD(jlong, long, Long, 'J', j)
1853 DEFINE_SETFIELD(jfloat, float, Float, 'F', f)
1854 DEFINE_SETFIELD(jdouble, double, Double, 'D', d)
1855
1856 DT_RETURN_MARK_DECL(ToReflectedField, jobject);
1857
1858 JNI_ENTRY(jobject, jni_ToReflectedField(JNIEnv *env, jclass cls, jfieldID fieldID, jboolean isStatic))
1859 JNIWrapper("ToReflectedField");
1860 DTRACE_PROBE4(hotspot_jni, ToReflectedField__entry,
1861 env, cls, fieldID, isStatic);
1862 jobject ret = NULL;
1863 DT_RETURN_MARK(ToReflectedField, jobject, (const jobject&)ret);
1864
1865 fieldDescriptor fd;
1866 bool found = false;
1867 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(cls));
1868
1869 assert(jfieldIDWorkaround::is_static_jfieldID(fieldID) == (isStatic != 0), "invalid fieldID");
1870
1871 if (isStatic) {
1872 // Static field. The fieldID a JNIid specifying the field holder and the offset within the klassOop.
1873 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1874 assert(id->is_static_field_id(), "invalid static field id");
1875 found = id->find_local_field(&fd);
1876 } else {
1877 // Non-static field. The fieldID is really the offset of the field within the instanceOop.
1878 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1879 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, &fd);
1880 }
1881 assert(found, "bad fieldID passed into jni_ToReflectedField");
1882 oop reflected = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
1883 ret = JNIHandles::make_local(env, reflected);
1884 return ret;
1885 JNI_END
1886
1887
1888 //
1889 // Accessing Static Fields
1890 //
1891 DT_RETURN_MARK_DECL(GetStaticFieldID, jfieldID);
1892
1893 JNI_ENTRY(jfieldID, jni_GetStaticFieldID(JNIEnv *env, jclass clazz,
1894 const char *name, const char *sig))
1895 JNIWrapper("GetStaticFieldID");
1896 DTRACE_PROBE4(hotspot_jni, GetStaticFieldID__entry, env, clazz, name, sig);
1897 jfieldID ret = NULL;
1898 DT_RETURN_MARK(GetStaticFieldID, jfieldID, (const jfieldID&)ret);
1899
1900 // The class should have been loaded (we have an instance of the class
1901 // passed in) so the field and signature should already be in the symbol
1902 // table. If they're not there, the field doesn't exist.
1903 TempNewSymbol fieldname = SymbolTable::probe(name, (int)strlen(name));
1904 TempNewSymbol signame = SymbolTable::probe(sig, (int)strlen(sig));
1905 if (fieldname == NULL || signame == NULL) {
1906 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1907 }
1908 KlassHandle k(THREAD,
1909 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1910 // Make sure class is initialized before handing id's out to static fields
1911 Klass::cast(k())->initialize(CHECK_NULL);
1912
1913 fieldDescriptor fd;
1914 if (!Klass::cast(k())->oop_is_instance() ||
1915 !instanceKlass::cast(k())->find_field(fieldname, signame, true, &fd)) {
1916 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1917 }
1918
1919 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
1920 JNIid* id = instanceKlass::cast(fd.field_holder())->jni_id_for(fd.offset());
1921 debug_only(id->set_is_static_field_id();)
1922
1923 debug_only(id->verify(fd.field_holder()));
1924
1925 ret = jfieldIDWorkaround::to_static_jfieldID(id);
1926 return ret;
1927 JNI_END
1928
1929
1930 JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID))
1931 JNIWrapper("GetStaticObjectField");
1932 DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID);
1933 #ifndef JNICHECK_KERNEL
1934 DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);)
1935 #endif // JNICHECK_KERNEL
1936 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1937 assert(id->is_static_field_id(), "invalid static field id");
1938 // Keep JVMTI addition small and only check enabled flag here.
1939 // jni_GetField_probe() assumes that is okay to create handles.
1940 if (JvmtiExport::should_post_field_access()) {
1941 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true);
1942 }
1943 jobject ret = JNIHandles::make_local(id->holder()->java_mirror()->obj_field(id->offset()));
1944 DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret);
1945 return ret;
1946 JNI_END
1947
1948 #define DEFINE_GETSTATICFIELD(Return,Fieldname,Result) \
1949 \
1950 DT_RETURN_MARK_DECL_FOR(Result, GetStatic##Result##Field, Return);\
1951 \
1952 JNI_ENTRY(Return, jni_GetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID)) \
1953 JNIWrapper("GetStatic" XSTR(Result) "Field"); \
1954 DTRACE_PROBE3(hotspot_jni, GetStatic##Result##Field__entry, env, clazz, fieldID);\
1955 Return ret = 0;\
1956 DT_RETURN_MARK_FOR(Result, GetStatic##Result##Field, Return, \
1957 (const Return&)ret);\
1958 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1959 assert(id->is_static_field_id(), "invalid static field id"); \
1960 /* Keep JVMTI addition small and only check enabled flag here. */ \
1961 /* jni_GetField_probe() assumes that is okay to create handles. */ \
1962 if (JvmtiExport::should_post_field_access()) { \
1963 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); \
1964 } \
1965 ret = id->holder()->java_mirror()-> Fieldname##_field (id->offset()); \
1966 return ret;\
1967 JNI_END
1968
1969 DEFINE_GETSTATICFIELD(jboolean, bool, Boolean)
1970 DEFINE_GETSTATICFIELD(jbyte, byte, Byte)
1971 DEFINE_GETSTATICFIELD(jchar, char, Char)
1972 DEFINE_GETSTATICFIELD(jshort, short, Short)
1973 DEFINE_GETSTATICFIELD(jint, int, Int)
1974 DEFINE_GETSTATICFIELD(jlong, long, Long)
1975 DEFINE_GETSTATICFIELD(jfloat, float, Float)
1976 DEFINE_GETSTATICFIELD(jdouble, double, Double)
1977
1978
1979 JNI_ENTRY(void, jni_SetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID, jobject value))
1980 JNIWrapper("SetStaticObjectField");
1981 DTRACE_PROBE4(hotspot_jni, SetStaticObjectField__entry, env, clazz, fieldID, value);
1982 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1983 assert(id->is_static_field_id(), "invalid static field id");
1984 // Keep JVMTI addition small and only check enabled flag here.
1985 // jni_SetField_probe() assumes that is okay to create handles.
1986 if (JvmtiExport::should_post_field_modification()) {
1987 jvalue field_value;
1988 field_value.l = value;
1989 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, 'L', (jvalue *)&field_value);
1990 }
1991 id->holder()->java_mirror()->obj_field_put(id->offset(), JNIHandles::resolve(value));
1992 DTRACE_PROBE(hotspot_jni, SetStaticObjectField__return);
1993 JNI_END
1994
1995
1996 #define DEFINE_SETSTATICFIELD(Argument,Fieldname,Result,SigType,unionType) \
1997 \
1998 JNI_ENTRY(void, jni_SetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID, Argument value)) \
1999 JNIWrapper("SetStatic" XSTR(Result) "Field"); \
2000 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, SetStatic##Result##Field__entry,\
2001 ( JNIEnv*, jclass, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
2002 HS_DTRACE_PROBE_N(hotspot_jni, SetStatic##Result##Field__entry, \
2003 ( env, clazz, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
2004 \
2005 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
2006 assert(id->is_static_field_id(), "invalid static field id"); \
2007 /* Keep JVMTI addition small and only check enabled flag here. */ \
2008 /* jni_SetField_probe() assumes that is okay to create handles. */ \
2009 if (JvmtiExport::should_post_field_modification()) { \
2010 jvalue field_value; \
2011 field_value.unionType = value; \
2012 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, SigType, (jvalue *)&field_value); \
2013 } \
2014 id->holder()->java_mirror()-> Fieldname##_field_put (id->offset(), value); \
2015 DTRACE_PROBE(hotspot_jni, SetStatic##Result##Field__return);\
2016 JNI_END
2017
2018 DEFINE_SETSTATICFIELD(jboolean, bool, Boolean, 'Z', z)
2019 DEFINE_SETSTATICFIELD(jbyte, byte, Byte, 'B', b)
2020 DEFINE_SETSTATICFIELD(jchar, char, Char, 'C', c)
2021 DEFINE_SETSTATICFIELD(jshort, short, Short, 'S', s)
2022 DEFINE_SETSTATICFIELD(jint, int, Int, 'I', i)
2023 DEFINE_SETSTATICFIELD(jlong, long, Long, 'J', j)
2024 DEFINE_SETSTATICFIELD(jfloat, float, Float, 'F', f)
2025 DEFINE_SETSTATICFIELD(jdouble, double, Double, 'D', d)
2026
2027
2028 //
2029 // String Operations
2030 //
2031
2032 // Unicode Interface
2033
2034 DT_RETURN_MARK_DECL(NewString, jstring);
2035
2036 JNI_ENTRY(jstring, jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len))
2037 JNIWrapper("NewString");
2038 DTRACE_PROBE3(hotspot_jni, NewString__entry, env, unicodeChars, len);
2039 jstring ret = NULL;
2040 DT_RETURN_MARK(NewString, jstring, (const jstring&)ret);
2041 oop string=java_lang_String::create_oop_from_unicode((jchar*) unicodeChars, len, CHECK_NULL);
2042 ret = (jstring) JNIHandles::make_local(env, string);
2043 return ret;
2044 JNI_END
2045
2046
2047 JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string))
2048 JNIWrapper("GetStringLength");
2049 DTRACE_PROBE2(hotspot_jni, GetStringLength__entry, env, string);
2050 jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string));
2051 DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret);
2052 return ret;
2053 JNI_END
2054
2055
2056 JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars(
2057 JNIEnv *env, jstring string, jboolean *isCopy))
2058 JNIWrapper("GetStringChars");
2059 DTRACE_PROBE3(hotspot_jni, GetStringChars__entry, env, string, isCopy);
2060 //%note jni_5
2061 if (isCopy != NULL) {
2062 *isCopy = JNI_TRUE;
2063 }
2064 oop s = JNIHandles::resolve_non_null(string);
2065 int s_len = java_lang_String::length(s);
2066 typeArrayOop s_value = java_lang_String::value(s);
2067 int s_offset = java_lang_String::offset(s);
2068 jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1); // add one for zero termination
2069 if (s_len > 0) {
2070 memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len);
2071 }
2072 buf[s_len] = 0;
2073 DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf);
2074 return buf;
2075 JNI_END
2076
2077
2078 JNI_QUICK_ENTRY(void, jni_ReleaseStringChars(JNIEnv *env, jstring str, const jchar *chars))
2079 JNIWrapper("ReleaseStringChars");
2080 DTRACE_PROBE3(hotspot_jni, ReleaseStringChars__entry, env, str, chars);
2081 //%note jni_6
2082 if (chars != NULL) {
2083 // Since String objects are supposed to be immutable, don't copy any
2084 // new data back. A bad user will have to go after the char array.
2085 FreeHeap((void*) chars);
2086 }
2087 DTRACE_PROBE(hotspot_jni, ReleaseStringChars__return);
2088 JNI_END
2089
2090
2091 // UTF Interface
2092
2093 DT_RETURN_MARK_DECL(NewStringUTF, jstring);
2094
2095 JNI_ENTRY(jstring, jni_NewStringUTF(JNIEnv *env, const char *bytes))
2096 JNIWrapper("NewStringUTF");
2097 DTRACE_PROBE2(hotspot_jni, NewStringUTF__entry, env, bytes);
2098 jstring ret;
2099 DT_RETURN_MARK(NewStringUTF, jstring, (const jstring&)ret);
2100
2101 oop result = java_lang_String::create_oop_from_str((char*) bytes, CHECK_NULL);
2102 ret = (jstring) JNIHandles::make_local(env, result);
2103 return ret;
2104 JNI_END
2105
2106
2107 JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string))
2108 JNIWrapper("GetStringUTFLength");
2109 DTRACE_PROBE2(hotspot_jni, GetStringUTFLength__entry, env, string);
2110 jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string));
2111 DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret);
2112 return ret;
2113 JNI_END
2114
2115
2116 JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboolean *isCopy))
2117 JNIWrapper("GetStringUTFChars");
2118 DTRACE_PROBE3(hotspot_jni, GetStringUTFChars__entry, env, string, isCopy);
2119 oop java_string = JNIHandles::resolve_non_null(string);
2120 size_t length = java_lang_String::utf8_length(java_string);
2121 char* result = AllocateHeap(length + 1, "GetStringUTFChars");
2122 java_lang_String::as_utf8_string(java_string, result, (int) length + 1);
2123 if (isCopy != NULL) *isCopy = JNI_TRUE;
2124 DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result);
2125 return result;
2126 JNI_END
2127
2128
2129 JNI_LEAF(void, jni_ReleaseStringUTFChars(JNIEnv *env, jstring str, const char *chars))
2130 JNIWrapper("ReleaseStringUTFChars");
2131 DTRACE_PROBE3(hotspot_jni, ReleaseStringUTFChars__entry, env, str, chars);
2132 if (chars != NULL) {
2133 FreeHeap((char*) chars);
2134 }
2135 DTRACE_PROBE(hotspot_jni, ReleaseStringUTFChars__return);
2136 JNI_END
2137
2138
2139 JNI_QUICK_ENTRY(jsize, jni_GetArrayLength(JNIEnv *env, jarray array))
2140 JNIWrapper("GetArrayLength");
2141 DTRACE_PROBE2(hotspot_jni, GetArrayLength__entry, env, array);
2142 arrayOop a = arrayOop(JNIHandles::resolve_non_null(array));
2143 assert(a->is_array(), "must be array");
2144 jsize ret = a->length();
2145 DTRACE_PROBE1(hotspot_jni, GetArrayLength__return, ret);
2146 return ret;
2147 JNI_END
2148
2149
2150 //
2151 // Object Array Operations
2152 //
2153
2154 DT_RETURN_MARK_DECL(NewObjectArray, jobjectArray);
2155
2156 JNI_ENTRY(jobjectArray, jni_NewObjectArray(JNIEnv *env, jsize length, jclass elementClass, jobject initialElement))
2157 JNIWrapper("NewObjectArray");
2158 DTRACE_PROBE4(hotspot_jni, NewObjectArray__entry, env, length, elementClass, initialElement);
2159 jobjectArray ret = NULL;
2160 DT_RETURN_MARK(NewObjectArray, jobjectArray, (const jobjectArray&)ret);
2161 KlassHandle ek(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(elementClass)));
2162 klassOop ako = Klass::cast(ek())->array_klass(CHECK_NULL);
2163 KlassHandle ak = KlassHandle(THREAD, ako);
2164 objArrayKlass::cast(ak())->initialize(CHECK_NULL);
2165 objArrayOop result = objArrayKlass::cast(ak())->allocate(length, CHECK_NULL);
2166 oop initial_value = JNIHandles::resolve(initialElement);
2167 if (initial_value != NULL) { // array already initialized with NULL
2168 for (int index = 0; index < length; index++) {
2169 result->obj_at_put(index, initial_value);
2170 }
2171 }
2172 ret = (jobjectArray) JNIHandles::make_local(env, result);
2173 return ret;
2174 JNI_END
2175
2176 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject);
2177
2178 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2179 JNIWrapper("GetObjectArrayElement");
2180 DTRACE_PROBE3(hotspot_jni, GetObjectArrayElement__entry, env, array, index);
2181 jobject ret = NULL;
2182 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2183 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2184 if (a->is_within_bounds(index)) {
2185 ret = JNIHandles::make_local(env, a->obj_at(index));
2186 return ret;
2187 } else {
2188 char buf[jintAsStringSize];
2189 sprintf(buf, "%d", index);
2190 THROW_MSG_0(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2191 }
2192 JNI_END
2193
2194 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement);
2195
2196 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2197 JNIWrapper("SetObjectArrayElement");
2198 DTRACE_PROBE4(hotspot_jni, SetObjectArrayElement__entry, env, array, index, value);
2199 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2200
2201 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2202 oop v = JNIHandles::resolve(value);
2203 if (a->is_within_bounds(index)) {
2204 if (v == NULL || v->is_a(objArrayKlass::cast(a->klass())->element_klass())) {
2205 a->obj_at_put(index, v);
2206 } else {
2207 THROW(vmSymbols::java_lang_ArrayStoreException());
2208 }
2209 } else {
2210 char buf[jintAsStringSize];
2211 sprintf(buf, "%d", index);
2212 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2213 }
2214 JNI_END
2215
2216
2217 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result) \
2218 \
2219 DT_RETURN_MARK_DECL(New##Result##Array, Return);\
2220 \
2221 JNI_ENTRY(Return, \
2222 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2223 JNIWrapper("New" XSTR(Result) "Array"); \
2224 DTRACE_PROBE2(hotspot_jni, New##Result##Array__entry, env, len);\
2225 Return ret = NULL;\
2226 DT_RETURN_MARK(New##Result##Array, Return, (const Return&)ret);\
2227 \
2228 oop obj= oopFactory::Allocator(len, CHECK_0); \
2229 ret = (Return) JNIHandles::make_local(env, obj); \
2230 return ret;\
2231 JNI_END
2232
2233 DEFINE_NEWSCALARARRAY(jbooleanArray, new_boolArray, Boolean)
2234 DEFINE_NEWSCALARARRAY(jbyteArray, new_byteArray, Byte)
2235 DEFINE_NEWSCALARARRAY(jshortArray, new_shortArray, Short)
2236 DEFINE_NEWSCALARARRAY(jcharArray, new_charArray, Char)
2237 DEFINE_NEWSCALARARRAY(jintArray, new_intArray, Int)
2238 DEFINE_NEWSCALARARRAY(jlongArray, new_longArray, Long)
2239 DEFINE_NEWSCALARARRAY(jfloatArray, new_singleArray, Float)
2240 DEFINE_NEWSCALARARRAY(jdoubleArray, new_doubleArray, Double)
2241
2242
2243 // Return an address which will fault if the caller writes to it.
2244
2245 static char* get_bad_address() {
2246 static char* bad_address = NULL;
2247 if (bad_address == NULL) {
2248 size_t size = os::vm_allocation_granularity();
2249 bad_address = os::reserve_memory(size);
2250 if (bad_address != NULL) {
2251 os::protect_memory(bad_address, size, os::MEM_PROT_READ,
2252 /*is_committed*/false);
2253 }
2254 }
2255 return bad_address;
2256 }
2257
2258
2259 #define DEFINE_GETSCALARARRAYELEMENTS(ElementTag,ElementType,Result, Tag) \
2260 \
2261 JNI_QUICK_ENTRY(ElementType*, \
2262 jni_Get##Result##ArrayElements(JNIEnv *env, ElementType##Array array, jboolean *isCopy)) \
2263 JNIWrapper("Get" XSTR(Result) "ArrayElements"); \
2264 DTRACE_PROBE3(hotspot_jni, Get##Result##ArrayElements__entry, env, array, isCopy);\
2265 /* allocate an chunk of memory in c land */ \
2266 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2267 ElementType* result; \
2268 int len = a->length(); \
2269 if (len == 0) { \
2270 /* Empty array: legal but useless, can't return NULL. \
2271 * Return a pointer to something useless. \
2272 * Avoid asserts in typeArrayOop. */ \
2273 result = (ElementType*)get_bad_address(); \
2274 } else { \
2275 result = NEW_C_HEAP_ARRAY(ElementType, len); \
2276 /* copy the array to the c chunk */ \
2277 memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \
2278 } \
2279 if (isCopy) *isCopy = JNI_TRUE; \
2280 DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\
2281 return result; \
2282 JNI_END
2283
2284 DEFINE_GETSCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2285 DEFINE_GETSCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2286 DEFINE_GETSCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2287 DEFINE_GETSCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2288 DEFINE_GETSCALARARRAYELEMENTS(T_INT, jint, Int, int)
2289 DEFINE_GETSCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2290 DEFINE_GETSCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2291 DEFINE_GETSCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2292
2293
2294 #define DEFINE_RELEASESCALARARRAYELEMENTS(ElementTag,ElementType,Result,Tag) \
2295 \
2296 JNI_QUICK_ENTRY(void, \
2297 jni_Release##Result##ArrayElements(JNIEnv *env, ElementType##Array array, \
2298 ElementType *buf, jint mode)) \
2299 JNIWrapper("Release" XSTR(Result) "ArrayElements"); \
2300 DTRACE_PROBE4(hotspot_jni, Release##Result##ArrayElements__entry, env, array, buf, mode);\
2301 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2302 int len = a->length(); \
2303 if (len != 0) { /* Empty array: nothing to free or copy. */ \
2304 if ((mode == 0) || (mode == JNI_COMMIT)) { \
2305 memcpy(a->Tag##_at_addr(0), buf, sizeof(ElementType)*len); \
2306 } \
2307 if ((mode == 0) || (mode == JNI_ABORT)) { \
2308 FreeHeap(buf); \
2309 } \
2310 } \
2311 DTRACE_PROBE(hotspot_jni, Release##Result##ArrayElements__return);\
2312 JNI_END
2313
2314 DEFINE_RELEASESCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2315 DEFINE_RELEASESCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2316 DEFINE_RELEASESCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2317 DEFINE_RELEASESCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2318 DEFINE_RELEASESCALARARRAYELEMENTS(T_INT, jint, Int, int)
2319 DEFINE_RELEASESCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2320 DEFINE_RELEASESCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2321 DEFINE_RELEASESCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2322
2323 #define DEFINE_GETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2324 DT_VOID_RETURN_MARK_DECL(Get##Result##ArrayRegion);\
2325 \
2326 JNI_ENTRY(void, \
2327 jni_Get##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2328 jsize len, ElementType *buf)) \
2329 JNIWrapper("Get" XSTR(Result) "ArrayRegion"); \
2330 DTRACE_PROBE5(hotspot_jni, Get##Result##ArrayRegion__entry, env, array, start, len, buf);\
2331 DT_VOID_RETURN_MARK(Get##Result##ArrayRegion); \
2332 typeArrayOop src = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2333 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)src->length())) { \
2334 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2335 } else { \
2336 if (len > 0) { \
2337 int sc = typeArrayKlass::cast(src->klass())->log2_element_size(); \
2338 memcpy((u_char*) buf, \
2339 (u_char*) src->Tag##_at_addr(start), \
2340 len << sc); \
2341 } \
2342 } \
2343 JNI_END
2344
2345 DEFINE_GETSCALARARRAYREGION(T_BOOLEAN, jboolean,Boolean, bool)
2346 DEFINE_GETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2347 DEFINE_GETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2348 DEFINE_GETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2349 DEFINE_GETSCALARARRAYREGION(T_INT, jint, Int, int)
2350 DEFINE_GETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2351 DEFINE_GETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2352 DEFINE_GETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2353
2354 #define DEFINE_SETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2355 DT_VOID_RETURN_MARK_DECL(Set##Result##ArrayRegion);\
2356 \
2357 JNI_ENTRY(void, \
2358 jni_Set##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2359 jsize len, const ElementType *buf)) \
2360 JNIWrapper("Set" XSTR(Result) "ArrayRegion"); \
2361 DTRACE_PROBE5(hotspot_jni, Set##Result##ArrayRegion__entry, env, array, start, len, buf);\
2362 DT_VOID_RETURN_MARK(Set##Result##ArrayRegion); \
2363 typeArrayOop dst = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2364 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)dst->length())) { \
2365 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2366 } else { \
2367 if (len > 0) { \
2368 int sc = typeArrayKlass::cast(dst->klass())->log2_element_size(); \
2369 memcpy((u_char*) dst->Tag##_at_addr(start), \
2370 (u_char*) buf, \
2371 len << sc); \
2372 } \
2373 } \
2374 JNI_END
2375
2376 DEFINE_SETSCALARARRAYREGION(T_BOOLEAN, jboolean, Boolean, bool)
2377 DEFINE_SETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2378 DEFINE_SETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2379 DEFINE_SETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2380 DEFINE_SETSCALARARRAYREGION(T_INT, jint, Int, int)
2381 DEFINE_SETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2382 DEFINE_SETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2383 DEFINE_SETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2384
2385
2386 //
2387 // Interception of natives
2388 //
2389
2390 // The RegisterNatives call being attempted tried to register with a method that
2391 // is not native. Ask JVM TI what prefixes have been specified. Then check
2392 // to see if the native method is now wrapped with the prefixes. See the
2393 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
2394 static methodOop find_prefixed_native(KlassHandle k,
2395 Symbol* name, Symbol* signature, TRAPS) {
2396 ResourceMark rm(THREAD);
2397 methodOop method;
2398 int name_len = name->utf8_length();
2399 char* name_str = name->as_utf8();
2400 int prefix_count;
2401 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
2402 for (int i = 0; i < prefix_count; i++) {
2403 char* prefix = prefixes[i];
2404 int prefix_len = (int)strlen(prefix);
2405
2406 // try adding this prefix to the method name and see if it matches another method name
2407 int trial_len = name_len + prefix_len;
2408 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
2409 strcpy(trial_name_str, prefix);
2410 strcat(trial_name_str, name_str);
2411 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
2412 if (trial_name == NULL) {
2413 continue; // no such symbol, so this prefix wasn't used, try the next prefix
2414 }
2415 method = Klass::cast(k())->lookup_method(trial_name, signature);
2416 if (method == NULL) {
2417 continue; // signature doesn't match, try the next prefix
2418 }
2419 if (method->is_native()) {
2420 method->set_is_prefixed_native();
2421 return method; // wahoo, we found a prefixed version of the method, return it
2422 }
2423 // found as non-native, so prefix is good, add it, probably just need more prefixes
2424 name_len = trial_len;
2425 name_str = trial_name_str;
2426 }
2427 return NULL; // not found
2428 }
2429
2430 static bool register_native(KlassHandle k, Symbol* name, Symbol* signature, address entry, TRAPS) {
2431 methodOop method = Klass::cast(k())->lookup_method(name, signature);
2432 if (method == NULL) {
2433 ResourceMark rm;
2434 stringStream st;
2435 st.print("Method %s name or signature does not match",
2436 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name, signature));
2437 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2438 }
2439 if (!method->is_native()) {
2440 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
2441 method = find_prefixed_native(k, name, signature, THREAD);
2442 if (method == NULL) {
2443 ResourceMark rm;
2444 stringStream st;
2445 st.print("Method %s is not declared as native",
2446 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name, signature));
2447 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2448 }
2449 }
2450
2451 if (entry != NULL) {
2452 method->set_native_function(entry,
2453 methodOopDesc::native_bind_event_is_interesting);
2454 } else {
2455 method->clear_native_function();
2456 }
2457 if (PrintJNIResolving) {
2458 ResourceMark rm(THREAD);
2459 tty->print_cr("[Registering JNI native method %s.%s]",
2460 Klass::cast(method->method_holder())->external_name(),
2461 method->name()->as_C_string());
2462 }
2463 return true;
2464 }
2465
2466 DT_RETURN_MARK_DECL(RegisterNatives, jint);
2467
2468 JNI_ENTRY(jint, jni_RegisterNatives(JNIEnv *env, jclass clazz,
2469 const JNINativeMethod *methods,
2470 jint nMethods))
2471 JNIWrapper("RegisterNatives");
2472 DTRACE_PROBE4(hotspot_jni, RegisterNatives__entry, env, clazz, methods, nMethods);
2473 jint ret = 0;
2474 DT_RETURN_MARK(RegisterNatives, jint, (const jint&)ret);
2475
2476 KlassHandle h_k(thread, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
2477
2478 for (int index = 0; index < nMethods; index++) {
2479 const char* meth_name = methods[index].name;
2480 const char* meth_sig = methods[index].signature;
2481 int meth_name_len = (int)strlen(meth_name);
2482
2483 // The class should have been loaded (we have an instance of the class
2484 // passed in) so the method and signature should already be in the symbol
2485 // table. If they're not there, the method doesn't exist.
2486 TempNewSymbol name = SymbolTable::probe(meth_name, meth_name_len);
2487 TempNewSymbol signature = SymbolTable::probe(meth_sig, (int)strlen(meth_sig));
2488
2489 if (name == NULL || signature == NULL) {
2490 ResourceMark rm;
2491 stringStream st;
2492 st.print("Method %s.%s%s not found", Klass::cast(h_k())->external_name(), meth_name, meth_sig);
2493 // Must return negative value on failure
2494 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), -1);
2495 }
2496
2497 bool res = register_native(h_k, name, signature,
2498 (address) methods[index].fnPtr, THREAD);
2499 if (!res) {
2500 ret = -1;
2501 break;
2502 }
2503 }
2504 return ret;
2505 JNI_END
2506
2507
2508 JNI_ENTRY(jint, jni_UnregisterNatives(JNIEnv *env, jclass clazz))
2509 JNIWrapper("UnregisterNatives");
2510 DTRACE_PROBE2(hotspot_jni, UnregisterNatives__entry, env, clazz);
2511 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz));
2512 //%note jni_2
2513 if (Klass::cast(k)->oop_is_instance()) {
2514 for (int index = 0; index < instanceKlass::cast(k)->methods()->length(); index++) {
2515 methodOop m = methodOop(instanceKlass::cast(k)->methods()->obj_at(index));
2516 if (m->is_native()) {
2517 m->clear_native_function();
2518 m->set_signature_handler(NULL);
2519 }
2520 }
2521 }
2522 DTRACE_PROBE1(hotspot_jni, UnregisterNatives__return, 0);
2523 return 0;
2524 JNI_END
2525
2526 //
2527 // Monitor functions
2528 //
2529
2530 DT_RETURN_MARK_DECL(MonitorEnter, jint);
2531
2532 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2533 DTRACE_PROBE2(hotspot_jni, MonitorEnter__entry, env, jobj);
2534 jint ret = JNI_ERR;
2535 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2536
2537 // If the object is null, we can't do anything with it
2538 if (jobj == NULL) {
2539 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2540 }
2541
2542 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2543 ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR));
2544 ret = JNI_OK;
2545 return ret;
2546 JNI_END
2547
2548 DT_RETURN_MARK_DECL(MonitorExit, jint);
2549
2550 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2551 DTRACE_PROBE2(hotspot_jni, MonitorExit__entry, env, jobj);
2552 jint ret = JNI_ERR;
2553 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2554
2555 // Don't do anything with a null object
2556 if (jobj == NULL) {
2557 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2558 }
2559
2560 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2561 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2562
2563 ret = JNI_OK;
2564 return ret;
2565 JNI_END
2566
2567 //
2568 // Extensions
2569 //
2570
2571 DT_VOID_RETURN_MARK_DECL(GetStringRegion);
2572
2573 JNI_ENTRY(void, jni_GetStringRegion(JNIEnv *env, jstring string, jsize start, jsize len, jchar *buf))
2574 JNIWrapper("GetStringRegion");
2575 DTRACE_PROBE5(hotspot_jni, GetStringRegion__entry, env, string, start, len, buf);
2576 DT_VOID_RETURN_MARK(GetStringRegion);
2577 oop s = JNIHandles::resolve_non_null(string);
2578 int s_len = java_lang_String::length(s);
2579 if (start < 0 || len < 0 || start + len > s_len) {
2580 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2581 } else {
2582 if (len > 0) {
2583 int s_offset = java_lang_String::offset(s);
2584 typeArrayOop s_value = java_lang_String::value(s);
2585 memcpy(buf, s_value->char_at_addr(s_offset+start), sizeof(jchar)*len);
2586 }
2587 }
2588 JNI_END
2589
2590 DT_VOID_RETURN_MARK_DECL(GetStringUTFRegion);
2591
2592 JNI_ENTRY(void, jni_GetStringUTFRegion(JNIEnv *env, jstring string, jsize start, jsize len, char *buf))
2593 JNIWrapper("GetStringUTFRegion");
2594 DTRACE_PROBE5(hotspot_jni, GetStringUTFRegion__entry, env, string, start, len, buf);
2595 DT_VOID_RETURN_MARK(GetStringUTFRegion);
2596 oop s = JNIHandles::resolve_non_null(string);
2597 int s_len = java_lang_String::length(s);
2598 if (start < 0 || len < 0 || start + len > s_len) {
2599 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2600 } else {
2601 //%note jni_7
2602 if (len > 0) {
2603 ResourceMark rm(THREAD);
2604 char *utf_region = java_lang_String::as_utf8_string(s, start, len);
2605 int utf_len = (int)strlen(utf_region);
2606 memcpy(buf, utf_region, utf_len);
2607 buf[utf_len] = 0;
2608 } else {
2609 // JDK null-terminates the buffer even in len is zero
2610 if (buf != NULL) {
2611 buf[0] = 0;
2612 }
2613 }
2614 }
2615 JNI_END
2616
2617
2618 JNI_ENTRY(void*, jni_GetPrimitiveArrayCritical(JNIEnv *env, jarray array, jboolean *isCopy))
2619 JNIWrapper("GetPrimitiveArrayCritical");
2620 DTRACE_PROBE3(hotspot_jni, GetPrimitiveArrayCritical__entry, env, array, isCopy);
2621 GC_locker::lock_critical(thread);
2622 if (isCopy != NULL) {
2623 *isCopy = JNI_FALSE;
2624 }
2625 oop a = JNIHandles::resolve_non_null(array);
2626 assert(a->is_array(), "just checking");
2627 BasicType type;
2628 if (a->is_objArray()) {
2629 type = T_OBJECT;
2630 } else {
2631 type = typeArrayKlass::cast(a->klass())->element_type();
2632 }
2633 void* ret = arrayOop(a)->base(type);
2634 DTRACE_PROBE1(hotspot_jni, GetPrimitiveArrayCritical__return, ret);
2635 return ret;
2636 JNI_END
2637
2638
2639 JNI_ENTRY(void, jni_ReleasePrimitiveArrayCritical(JNIEnv *env, jarray array, void *carray, jint mode))
2640 JNIWrapper("ReleasePrimitiveArrayCritical");
2641 DTRACE_PROBE4(hotspot_jni, ReleasePrimitiveArrayCritical__entry, env, array, carray, mode);
2642 // The array, carray and mode arguments are ignored
2643 GC_locker::unlock_critical(thread);
2644 DTRACE_PROBE(hotspot_jni, ReleasePrimitiveArrayCritical__return);
2645 JNI_END
2646
2647
2648 JNI_ENTRY(const jchar*, jni_GetStringCritical(JNIEnv *env, jstring string, jboolean *isCopy))
2649 JNIWrapper("GetStringCritical");
2650 DTRACE_PROBE3(hotspot_jni, GetStringCritical__entry, env, string, isCopy);
2651 GC_locker::lock_critical(thread);
2652 if (isCopy != NULL) {
2653 *isCopy = JNI_FALSE;
2654 }
2655 oop s = JNIHandles::resolve_non_null(string);
2656 int s_len = java_lang_String::length(s);
2657 typeArrayOop s_value = java_lang_String::value(s);
2658 int s_offset = java_lang_String::offset(s);
2659 const jchar* ret;
2660 if (s_len > 0) {
2661 ret = s_value->char_at_addr(s_offset);
2662 } else {
2663 ret = (jchar*) s_value->base(T_CHAR);
2664 }
2665 DTRACE_PROBE1(hotspot_jni, GetStringCritical__return, ret);
2666 return ret;
2667 JNI_END
2668
2669
2670 JNI_ENTRY(void, jni_ReleaseStringCritical(JNIEnv *env, jstring str, const jchar *chars))
2671 JNIWrapper("ReleaseStringCritical");
2672 DTRACE_PROBE3(hotspot_jni, ReleaseStringCritical__entry, env, str, chars);
2673 // The str and chars arguments are ignored
2674 GC_locker::unlock_critical(thread);
2675 DTRACE_PROBE(hotspot_jni, ReleaseStringCritical__return);
2676 JNI_END
2677
2678
2679 JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref))
2680 JNIWrapper("jni_NewWeakGlobalRef");
2681 DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref);
2682 Handle ref_handle(thread, JNIHandles::resolve(ref));
2683 jweak ret = JNIHandles::make_weak_global(ref_handle);
2684 DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret);
2685 return ret;
2686 JNI_END
2687
2688 // Must be JNI_ENTRY (with HandleMark)
2689 JNI_ENTRY(void, jni_DeleteWeakGlobalRef(JNIEnv *env, jweak ref))
2690 JNIWrapper("jni_DeleteWeakGlobalRef");
2691 DTRACE_PROBE2(hotspot_jni, DeleteWeakGlobalRef__entry, env, ref);
2692 JNIHandles::destroy_weak_global(ref);
2693 DTRACE_PROBE(hotspot_jni, DeleteWeakGlobalRef__return);
2694 JNI_END
2695
2696
2697 JNI_QUICK_ENTRY(jboolean, jni_ExceptionCheck(JNIEnv *env))
2698 JNIWrapper("jni_ExceptionCheck");
2699 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__entry, env);
2700 jni_check_async_exceptions(thread);
2701 jboolean ret = (thread->has_pending_exception()) ? JNI_TRUE : JNI_FALSE;
2702 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__return, ret);
2703 return ret;
2704 JNI_END
2705
2706
2707 // Initialization state for three routines below relating to
2708 // java.nio.DirectBuffers
2709 static jint directBufferSupportInitializeStarted = 0;
2710 static volatile jint directBufferSupportInitializeEnded = 0;
2711 static volatile jint directBufferSupportInitializeFailed = 0;
2712 static jclass bufferClass = NULL;
2713 static jclass directBufferClass = NULL;
2714 static jclass directByteBufferClass = NULL;
2715 static jmethodID directByteBufferConstructor = NULL;
2716 static jfieldID directBufferAddressField = NULL;
2717 static jfieldID bufferCapacityField = NULL;
2718
2719 static jclass lookupOne(JNIEnv* env, const char* name, TRAPS) {
2720 Handle loader; // null (bootstrap) loader
2721 Handle protection_domain; // null protection domain
2722
2723 TempNewSymbol sym = SymbolTable::new_symbol(name, CHECK_NULL);
2724 jclass result = find_class_from_class_loader(env, sym, true, loader, protection_domain, true, CHECK_NULL);
2725
2726 if (TraceClassResolution && result != NULL) {
2727 trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
2728 }
2729 return result;
2730 }
2731
2732 // These lookups are done with the NULL (bootstrap) ClassLoader to
2733 // circumvent any security checks that would be done by jni_FindClass.
2734 JNI_ENTRY(bool, lookupDirectBufferClasses(JNIEnv* env))
2735 {
2736 if ((bufferClass = lookupOne(env, "java/nio/Buffer", thread)) == NULL) { return false; }
2737 if ((directBufferClass = lookupOne(env, "sun/nio/ch/DirectBuffer", thread)) == NULL) { return false; }
2738 if ((directByteBufferClass = lookupOne(env, "java/nio/DirectByteBuffer", thread)) == NULL) { return false; }
2739 return true;
2740 }
2741 JNI_END
2742
2743
2744 static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) {
2745 if (directBufferSupportInitializeFailed) {
2746 return false;
2747 }
2748
2749 if (Atomic::cmpxchg(1, &directBufferSupportInitializeStarted, 0) == 0) {
2750 if (!lookupDirectBufferClasses(env)) {
2751 directBufferSupportInitializeFailed = 1;
2752 return false;
2753 }
2754
2755 // Make global references for these
2756 bufferClass = (jclass) env->NewGlobalRef(bufferClass);
2757 directBufferClass = (jclass) env->NewGlobalRef(directBufferClass);
2758 directByteBufferClass = (jclass) env->NewGlobalRef(directByteBufferClass);
2759
2760 // Get needed field and method IDs
2761 directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V");
2762 directBufferAddressField = env->GetFieldID(bufferClass, "address", "J");
2763 bufferCapacityField = env->GetFieldID(bufferClass, "capacity", "I");
2764
2765 if ((directByteBufferConstructor == NULL) ||
2766 (directBufferAddressField == NULL) ||
2767 (bufferCapacityField == NULL)) {
2768 directBufferSupportInitializeFailed = 1;
2769 return false;
2770 }
2771
2772 directBufferSupportInitializeEnded = 1;
2773 } else {
2774 while (!directBufferSupportInitializeEnded && !directBufferSupportInitializeFailed) {
2775 // Set state as yield_all can call os:sleep. On Solaris, yield_all calls
2776 // os::sleep which requires the VM state transition. On other platforms, it
2777 // is not necessary. The following call to change the VM state is purposely
2778 // put inside the loop to avoid potential deadlock when multiple threads
2779 // try to call this method. See 6791815 for more details.
2780 ThreadInVMfromNative tivn(thread);
2781 os::yield_all();
2782 }
2783 }
2784
2785 return !directBufferSupportInitializeFailed;
2786 }
2787
2788 extern "C" jobject JNICALL jni_NewDirectByteBuffer(JNIEnv *env, void* address, jlong capacity)
2789 {
2790 // thread_from_jni_environment() will block if VM is gone.
2791 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2792
2793 JNIWrapper("jni_NewDirectByteBuffer");
2794 DTRACE_PROBE3(hotspot_jni, NewDirectByteBuffer__entry, env, address, capacity);
2795
2796 if (!directBufferSupportInitializeEnded) {
2797 if (!initializeDirectBufferSupport(env, thread)) {
2798 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, NULL);
2799 return NULL;
2800 }
2801 }
2802
2803 // Being paranoid about accidental sign extension on address
2804 jlong addr = (jlong) ((uintptr_t) address);
2805 // NOTE that package-private DirectByteBuffer constructor currently
2806 // takes int capacity
2807 jint cap = (jint) capacity;
2808 jobject ret = env->NewObject(directByteBufferClass, directByteBufferConstructor, addr, cap);
2809 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, ret);
2810 return ret;
2811 }
2812
2813 DT_RETURN_MARK_DECL(GetDirectBufferAddress, void*);
2814
2815 extern "C" void* JNICALL jni_GetDirectBufferAddress(JNIEnv *env, jobject buf)
2816 {
2817 // thread_from_jni_environment() will block if VM is gone.
2818 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2819
2820 JNIWrapper("jni_GetDirectBufferAddress");
2821 DTRACE_PROBE2(hotspot_jni, GetDirectBufferAddress__entry, env, buf);
2822 void* ret = NULL;
2823 DT_RETURN_MARK(GetDirectBufferAddress, void*, (const void*&)ret);
2824
2825 if (!directBufferSupportInitializeEnded) {
2826 if (!initializeDirectBufferSupport(env, thread)) {
2827 return 0;
2828 }
2829 }
2830
2831 if ((buf != NULL) && (!env->IsInstanceOf(buf, directBufferClass))) {
2832 return 0;
2833 }
2834
2835 ret = (void*)(intptr_t)env->GetLongField(buf, directBufferAddressField);
2836 return ret;
2837 }
2838
2839 DT_RETURN_MARK_DECL(GetDirectBufferCapacity, jlong);
2840
2841 extern "C" jlong JNICALL jni_GetDirectBufferCapacity(JNIEnv *env, jobject buf)
2842 {
2843 // thread_from_jni_environment() will block if VM is gone.
2844 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2845
2846 JNIWrapper("jni_GetDirectBufferCapacity");
2847 DTRACE_PROBE2(hotspot_jni, GetDirectBufferCapacity__entry, env, buf);
2848 jlong ret = -1;
2849 DT_RETURN_MARK(GetDirectBufferCapacity, jlong, (const jlong&)ret);
2850
2851 if (!directBufferSupportInitializeEnded) {
2852 if (!initializeDirectBufferSupport(env, thread)) {
2853 ret = 0;
2854 return ret;
2855 }
2856 }
2857
2858 if (buf == NULL) {
2859 return -1;
2860 }
2861
2862 if (!env->IsInstanceOf(buf, directBufferClass)) {
2863 return -1;
2864 }
2865
2866 // NOTE that capacity is currently an int in the implementation
2867 ret = env->GetIntField(buf, bufferCapacityField);
2868 return ret;
2869 }
2870
2871
2872 JNI_LEAF(jint, jni_GetVersion(JNIEnv *env))
2873 JNIWrapper("GetVersion");
2874 DTRACE_PROBE1(hotspot_jni, GetVersion__entry, env);
2875 DTRACE_PROBE1(hotspot_jni, GetVersion__return, CurrentVersion);
2876 return CurrentVersion;
2877 JNI_END
2878
2879 extern struct JavaVM_ main_vm;
2880
2881 JNI_LEAF(jint, jni_GetJavaVM(JNIEnv *env, JavaVM **vm))
2882 JNIWrapper("jni_GetJavaVM");
2883 DTRACE_PROBE2(hotspot_jni, GetJavaVM__entry, env, vm);
2884 *vm = (JavaVM *)(&main_vm);
2885 DTRACE_PROBE1(hotspot_jni, GetJavaVM__return, JNI_OK);
2886 return JNI_OK;
2887 JNI_END
2888
2889 // Structure containing all jni functions
2890 struct JNINativeInterface_ jni_NativeInterface = {
2891 NULL,
2892 NULL,
2893 NULL,
2894
2895 NULL,
2896
2897 jni_GetVersion,
2898
2899 jni_DefineClass,
2900 jni_FindClass,
2901
2902 jni_FromReflectedMethod,
2903 jni_FromReflectedField,
2904
2905 jni_ToReflectedMethod,
2906
2907 jni_GetSuperclass,
2908 jni_IsAssignableFrom,
2909
2910 jni_ToReflectedField,
2911
2912 jni_Throw,
2913 jni_ThrowNew,
2914 jni_ExceptionOccurred,
2915 jni_ExceptionDescribe,
2916 jni_ExceptionClear,
2917 jni_FatalError,
2918
2919 jni_PushLocalFrame,
2920 jni_PopLocalFrame,
2921
2922 jni_NewGlobalRef,
2923 jni_DeleteGlobalRef,
2924 jni_DeleteLocalRef,
2925 jni_IsSameObject,
2926
2927 jni_NewLocalRef,
2928 jni_EnsureLocalCapacity,
2929
2930 jni_AllocObject,
2931 jni_NewObject,
2932 jni_NewObjectV,
2933 jni_NewObjectA,
2934
2935 jni_GetObjectClass,
2936 jni_IsInstanceOf,
2937
2938 jni_GetMethodID,
2939
2940 jni_CallObjectMethod,
2941 jni_CallObjectMethodV,
2942 jni_CallObjectMethodA,
2943 jni_CallBooleanMethod,
2944 jni_CallBooleanMethodV,
2945 jni_CallBooleanMethodA,
2946 jni_CallByteMethod,
2947 jni_CallByteMethodV,
2948 jni_CallByteMethodA,
2949 jni_CallCharMethod,
2950 jni_CallCharMethodV,
2951 jni_CallCharMethodA,
2952 jni_CallShortMethod,
2953 jni_CallShortMethodV,
2954 jni_CallShortMethodA,
2955 jni_CallIntMethod,
2956 jni_CallIntMethodV,
2957 jni_CallIntMethodA,
2958 jni_CallLongMethod,
2959 jni_CallLongMethodV,
2960 jni_CallLongMethodA,
2961 jni_CallFloatMethod,
2962 jni_CallFloatMethodV,
2963 jni_CallFloatMethodA,
2964 jni_CallDoubleMethod,
2965 jni_CallDoubleMethodV,
2966 jni_CallDoubleMethodA,
2967 jni_CallVoidMethod,
2968 jni_CallVoidMethodV,
2969 jni_CallVoidMethodA,
2970
2971 jni_CallNonvirtualObjectMethod,
2972 jni_CallNonvirtualObjectMethodV,
2973 jni_CallNonvirtualObjectMethodA,
2974 jni_CallNonvirtualBooleanMethod,
2975 jni_CallNonvirtualBooleanMethodV,
2976 jni_CallNonvirtualBooleanMethodA,
2977 jni_CallNonvirtualByteMethod,
2978 jni_CallNonvirtualByteMethodV,
2979 jni_CallNonvirtualByteMethodA,
2980 jni_CallNonvirtualCharMethod,
2981 jni_CallNonvirtualCharMethodV,
2982 jni_CallNonvirtualCharMethodA,
2983 jni_CallNonvirtualShortMethod,
2984 jni_CallNonvirtualShortMethodV,
2985 jni_CallNonvirtualShortMethodA,
2986 jni_CallNonvirtualIntMethod,
2987 jni_CallNonvirtualIntMethodV,
2988 jni_CallNonvirtualIntMethodA,
2989 jni_CallNonvirtualLongMethod,
2990 jni_CallNonvirtualLongMethodV,
2991 jni_CallNonvirtualLongMethodA,
2992 jni_CallNonvirtualFloatMethod,
2993 jni_CallNonvirtualFloatMethodV,
2994 jni_CallNonvirtualFloatMethodA,
2995 jni_CallNonvirtualDoubleMethod,
2996 jni_CallNonvirtualDoubleMethodV,
2997 jni_CallNonvirtualDoubleMethodA,
2998 jni_CallNonvirtualVoidMethod,
2999 jni_CallNonvirtualVoidMethodV,
3000 jni_CallNonvirtualVoidMethodA,
3001
3002 jni_GetFieldID,
3003
3004 jni_GetObjectField,
3005 jni_GetBooleanField,
3006 jni_GetByteField,
3007 jni_GetCharField,
3008 jni_GetShortField,
3009 jni_GetIntField,
3010 jni_GetLongField,
3011 jni_GetFloatField,
3012 jni_GetDoubleField,
3013
3014 jni_SetObjectField,
3015 jni_SetBooleanField,
3016 jni_SetByteField,
3017 jni_SetCharField,
3018 jni_SetShortField,
3019 jni_SetIntField,
3020 jni_SetLongField,
3021 jni_SetFloatField,
3022 jni_SetDoubleField,
3023
3024 jni_GetStaticMethodID,
3025
3026 jni_CallStaticObjectMethod,
3027 jni_CallStaticObjectMethodV,
3028 jni_CallStaticObjectMethodA,
3029 jni_CallStaticBooleanMethod,
3030 jni_CallStaticBooleanMethodV,
3031 jni_CallStaticBooleanMethodA,
3032 jni_CallStaticByteMethod,
3033 jni_CallStaticByteMethodV,
3034 jni_CallStaticByteMethodA,
3035 jni_CallStaticCharMethod,
3036 jni_CallStaticCharMethodV,
3037 jni_CallStaticCharMethodA,
3038 jni_CallStaticShortMethod,
3039 jni_CallStaticShortMethodV,
3040 jni_CallStaticShortMethodA,
3041 jni_CallStaticIntMethod,
3042 jni_CallStaticIntMethodV,
3043 jni_CallStaticIntMethodA,
3044 jni_CallStaticLongMethod,
3045 jni_CallStaticLongMethodV,
3046 jni_CallStaticLongMethodA,
3047 jni_CallStaticFloatMethod,
3048 jni_CallStaticFloatMethodV,
3049 jni_CallStaticFloatMethodA,
3050 jni_CallStaticDoubleMethod,
3051 jni_CallStaticDoubleMethodV,
3052 jni_CallStaticDoubleMethodA,
3053 jni_CallStaticVoidMethod,
3054 jni_CallStaticVoidMethodV,
3055 jni_CallStaticVoidMethodA,
3056
3057 jni_GetStaticFieldID,
3058
3059 jni_GetStaticObjectField,
3060 jni_GetStaticBooleanField,
3061 jni_GetStaticByteField,
3062 jni_GetStaticCharField,
3063 jni_GetStaticShortField,
3064 jni_GetStaticIntField,
3065 jni_GetStaticLongField,
3066 jni_GetStaticFloatField,
3067 jni_GetStaticDoubleField,
3068
3069 jni_SetStaticObjectField,
3070 jni_SetStaticBooleanField,
3071 jni_SetStaticByteField,
3072 jni_SetStaticCharField,
3073 jni_SetStaticShortField,
3074 jni_SetStaticIntField,
3075 jni_SetStaticLongField,
3076 jni_SetStaticFloatField,
3077 jni_SetStaticDoubleField,
3078
3079 jni_NewString,
3080 jni_GetStringLength,
3081 jni_GetStringChars,
3082 jni_ReleaseStringChars,
3083
3084 jni_NewStringUTF,
3085 jni_GetStringUTFLength,
3086 jni_GetStringUTFChars,
3087 jni_ReleaseStringUTFChars,
3088
3089 jni_GetArrayLength,
3090
3091 jni_NewObjectArray,
3092 jni_GetObjectArrayElement,
3093 jni_SetObjectArrayElement,
3094
3095 jni_NewBooleanArray,
3096 jni_NewByteArray,
3097 jni_NewCharArray,
3098 jni_NewShortArray,
3099 jni_NewIntArray,
3100 jni_NewLongArray,
3101 jni_NewFloatArray,
3102 jni_NewDoubleArray,
3103
3104 jni_GetBooleanArrayElements,
3105 jni_GetByteArrayElements,
3106 jni_GetCharArrayElements,
3107 jni_GetShortArrayElements,
3108 jni_GetIntArrayElements,
3109 jni_GetLongArrayElements,
3110 jni_GetFloatArrayElements,
3111 jni_GetDoubleArrayElements,
3112
3113 jni_ReleaseBooleanArrayElements,
3114 jni_ReleaseByteArrayElements,
3115 jni_ReleaseCharArrayElements,
3116 jni_ReleaseShortArrayElements,
3117 jni_ReleaseIntArrayElements,
3118 jni_ReleaseLongArrayElements,
3119 jni_ReleaseFloatArrayElements,
3120 jni_ReleaseDoubleArrayElements,
3121
3122 jni_GetBooleanArrayRegion,
3123 jni_GetByteArrayRegion,
3124 jni_GetCharArrayRegion,
3125 jni_GetShortArrayRegion,
3126 jni_GetIntArrayRegion,
3127 jni_GetLongArrayRegion,
3128 jni_GetFloatArrayRegion,
3129 jni_GetDoubleArrayRegion,
3130
3131 jni_SetBooleanArrayRegion,
3132 jni_SetByteArrayRegion,
3133 jni_SetCharArrayRegion,
3134 jni_SetShortArrayRegion,
3135 jni_SetIntArrayRegion,
3136 jni_SetLongArrayRegion,
3137 jni_SetFloatArrayRegion,
3138 jni_SetDoubleArrayRegion,
3139
3140 jni_RegisterNatives,
3141 jni_UnregisterNatives,
3142
3143 jni_MonitorEnter,
3144 jni_MonitorExit,
3145
3146 jni_GetJavaVM,
3147
3148 jni_GetStringRegion,
3149 jni_GetStringUTFRegion,
3150
3151 jni_GetPrimitiveArrayCritical,
3152 jni_ReleasePrimitiveArrayCritical,
3153
3154 jni_GetStringCritical,
3155 jni_ReleaseStringCritical,
3156
3157 jni_NewWeakGlobalRef,
3158 jni_DeleteWeakGlobalRef,
3159
3160 jni_ExceptionCheck,
3161
3162 jni_NewDirectByteBuffer,
3163 jni_GetDirectBufferAddress,
3164 jni_GetDirectBufferCapacity,
3165
3166 // New 1_6 features
3167
3168 jni_GetObjectRefType
3169 };
3170
3171
3172 // For jvmti use to modify jni function table.
3173 // Java threads in native contiues to run until it is transitioned
3174 // to VM at safepoint. Before the transition or before it is blocked
3175 // for safepoint it may access jni function table. VM could crash if
3176 // any java thread access the jni function table in the middle of memcpy.
3177 // To avoid this each function pointers are copied automically.
3178 void copy_jni_function_table(const struct JNINativeInterface_ *new_jni_NativeInterface) {
3179 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
3180 intptr_t *a = (intptr_t *) jni_functions();
3181 intptr_t *b = (intptr_t *) new_jni_NativeInterface;
3182 for (uint i=0; i < sizeof(struct JNINativeInterface_)/sizeof(void *); i++) {
3183 Atomic::store_ptr(*b++, a++);
3184 }
3185 }
3186
3187 void quicken_jni_functions() {
3188 // Replace Get<Primitive>Field with fast versions
3189 if (UseFastJNIAccessors && !JvmtiExport::can_post_field_access()
3190 && !VerifyJNIFields && !TraceJNICalls && !CountJNICalls && !CheckJNICalls
3191 #if defined(_WINDOWS) && defined(IA32) && defined(COMPILER2)
3192 // windows x86 currently needs SEH wrapper and the gain of the fast
3193 // versions currently isn't certain for server vm on uniprocessor.
3194 && os::is_MP()
3195 #endif
3196 ) {
3197 address func;
3198 func = JNI_FastGetField::generate_fast_get_boolean_field();
3199 if (func != (address)-1) {
3200 jni_NativeInterface.GetBooleanField = (GetBooleanField_t)func;
3201 }
3202 func = JNI_FastGetField::generate_fast_get_byte_field();
3203 if (func != (address)-1) {
3204 jni_NativeInterface.GetByteField = (GetByteField_t)func;
3205 }
3206 func = JNI_FastGetField::generate_fast_get_char_field();
3207 if (func != (address)-1) {
3208 jni_NativeInterface.GetCharField = (GetCharField_t)func;
3209 }
3210 func = JNI_FastGetField::generate_fast_get_short_field();
3211 if (func != (address)-1) {
3212 jni_NativeInterface.GetShortField = (GetShortField_t)func;
3213 }
3214 func = JNI_FastGetField::generate_fast_get_int_field();
3215 if (func != (address)-1) {
3216 jni_NativeInterface.GetIntField = (GetIntField_t)func;
3217 }
3218 func = JNI_FastGetField::generate_fast_get_long_field();
3219 if (func != (address)-1) {
3220 jni_NativeInterface.GetLongField = (GetLongField_t)func;
3221 }
3222 func = JNI_FastGetField::generate_fast_get_float_field();
3223 if (func != (address)-1) {
3224 jni_NativeInterface.GetFloatField = (GetFloatField_t)func;
3225 }
3226 func = JNI_FastGetField::generate_fast_get_double_field();
3227 if (func != (address)-1) {
3228 jni_NativeInterface.GetDoubleField = (GetDoubleField_t)func;
3229 }
3230 }
3231 }
3232
3233 // Returns the function structure
3234 struct JNINativeInterface_* jni_functions() {
3235 #ifndef JNICHECK_KERNEL
3236 if (CheckJNICalls) return jni_functions_check();
3237 #else // JNICHECK_KERNEL
3238 if (CheckJNICalls) warning("-Xcheck:jni is not supported in kernel vm.");
3239 #endif // JNICHECK_KERNEL
3240 return &jni_NativeInterface;
3241 }
3242
3243 // Returns the function structure
3244 struct JNINativeInterface_* jni_functions_nocheck() {
3245 return &jni_NativeInterface;
3246 }
3247
3248
3249 // Invocation API
3250
3251
3252 // Forward declaration
3253 extern const struct JNIInvokeInterface_ jni_InvokeInterface;
3254
3255 // Global invocation API vars
3256 volatile jint vm_created = 0;
3257 // Indicate whether it is safe to recreate VM
3258 volatile jint safe_to_recreate_vm = 1;
3259 struct JavaVM_ main_vm = {&jni_InvokeInterface};
3260
3261
3262 #define JAVASTACKSIZE (400 * 1024) /* Default size of a thread java stack */
3263 enum { VERIFY_NONE, VERIFY_REMOTE, VERIFY_ALL };
3264
3265 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, void*);
3266 DT_RETURN_MARK_DECL(GetDefaultJavaVMInitArgs, jint);
3267
3268 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args_) {
3269 HS_DTRACE_PROBE1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, args_);
3270 JDK1_1InitArgs *args = (JDK1_1InitArgs *)args_;
3271 jint ret = JNI_ERR;
3272 DT_RETURN_MARK(GetDefaultJavaVMInitArgs, jint, (const jint&)ret);
3273
3274 if (Threads::is_supported_jni_version(args->version)) {
3275 ret = JNI_OK;
3276 }
3277 // 1.1 style no longer supported in hotspot.
3278 // According the JNI spec, we should update args->version on return.
3279 // We also use the structure to communicate with launcher about default
3280 // stack size.
3281 if (args->version == JNI_VERSION_1_1) {
3282 args->version = JNI_VERSION_1_2;
3283 // javaStackSize is int in arguments structure
3284 assert(jlong(ThreadStackSize) * K < INT_MAX, "integer overflow");
3285 args->javaStackSize = (jint)(ThreadStackSize * K);
3286 }
3287 return ret;
3288 }
3289
3290 #ifndef PRODUCT
3291
3292 #include "utilities/quickSort.hpp"
3293
3294 void execute_internal_vm_tests() {
3295 if (ExecuteInternalVMTests) {
3296 assert(QuickSort::test_quick_sort(), "test_quick_sort failed");
3297 tty->print_cr("All tests passed");
3298 }
3299 }
3300
3301 #endif
3302
3303 HS_DTRACE_PROBE_DECL3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3304 DT_RETURN_MARK_DECL(CreateJavaVM, jint);
3305
3306 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) {
3307 HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3308
3309 jint result = JNI_ERR;
3310 DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result);
3311
3312 // We're about to use Atomic::xchg for synchronization. Some Zero
3313 // platforms use the GCC builtin __sync_lock_test_and_set for this,
3314 // but __sync_lock_test_and_set is not guaranteed to do what we want
3315 // on all architectures. So we check it works before relying on it.
3316 #if defined(ZERO) && defined(ASSERT)
3317 {
3318 jint a = 0xcafebabe;
3319 jint b = Atomic::xchg(0xdeadbeef, &a);
3320 void *c = &a;
3321 void *d = Atomic::xchg_ptr(&b, &c);
3322 assert(a == (jint) 0xdeadbeef && b == (jint) 0xcafebabe, "Atomic::xchg() works");
3323 assert(c == &b && d == &a, "Atomic::xchg_ptr() works");
3324 }
3325 #endif // ZERO && ASSERT
3326
3327 // At the moment it's only possible to have one Java VM,
3328 // since some of the runtime state is in global variables.
3329
3330 // We cannot use our mutex locks here, since they only work on
3331 // Threads. We do an atomic compare and exchange to ensure only
3332 // one thread can call this method at a time
3333
3334 // We use Atomic::xchg rather than Atomic::add/dec since on some platforms
3335 // the add/dec implementations are dependent on whether we are running
3336 // on a multiprocessor, and at this stage of initialization the os::is_MP
3337 // function used to determine this will always return false. Atomic::xchg
3338 // does not have this problem.
3339 if (Atomic::xchg(1, &vm_created) == 1) {
3340 return JNI_ERR; // already created, or create attempt in progress
3341 }
3342 if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) {
3343 return JNI_ERR; // someone tried and failed and retry not allowed.
3344 }
3345
3346 assert(vm_created == 1, "vm_created is true during the creation");
3347
3348 /**
3349 * Certain errors during initialization are recoverable and do not
3350 * prevent this method from being called again at a later time
3351 * (perhaps with different arguments). However, at a certain
3352 * point during initialization if an error occurs we cannot allow
3353 * this function to be called again (or it will crash). In those
3354 * situations, the 'canTryAgain' flag is set to false, which atomically
3355 * sets safe_to_recreate_vm to 1, such that any new call to
3356 * JNI_CreateJavaVM will immediately fail using the above logic.
3357 */
3358 bool can_try_again = true;
3359
3360 result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again);
3361 if (result == JNI_OK) {
3362 JavaThread *thread = JavaThread::current();
3363 /* thread is thread_in_vm here */
3364 *vm = (JavaVM *)(&main_vm);
3365 *(JNIEnv**)penv = thread->jni_environment();
3366
3367 // Tracks the time application was running before GC
3368 RuntimeService::record_application_start();
3369
3370 // Notify JVMTI
3371 if (JvmtiExport::should_post_thread_life()) {
3372 JvmtiExport::post_thread_start(thread);
3373 }
3374 // Check if we should compile all classes on bootclasspath
3375 NOT_PRODUCT(if (CompileTheWorld) ClassLoader::compile_the_world();)
3376 // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving.
3377 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3378 } else {
3379 if (can_try_again) {
3380 // reset safe_to_recreate_vm to 1 so that retrial would be possible
3381 safe_to_recreate_vm = 1;
3382 }
3383
3384 // Creation failed. We must reset vm_created
3385 *vm = 0;
3386 *(JNIEnv**)penv = 0;
3387 // reset vm_created last to avoid race condition. Use OrderAccess to
3388 // control both compiler and architectural-based reordering.
3389 OrderAccess::release_store(&vm_created, 0);
3390 }
3391
3392 NOT_PRODUCT(test_error_handler(ErrorHandlerTest));
3393 NOT_PRODUCT(execute_internal_vm_tests());
3394 return result;
3395 }
3396
3397 HS_DTRACE_PROBE_DECL3(hotspot_jni, GetCreatedJavaVMs__entry, \
3398 JavaVM**, jsize, jsize*);
3399 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetCreatedJavaVMs__return, jint);
3400
3401 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vm_buf, jsize bufLen, jsize *numVMs) {
3402 // See bug 4367188, the wrapper can sometimes cause VM crashes
3403 // JNIWrapper("GetCreatedJavaVMs");
3404 HS_DTRACE_PROBE3(hotspot_jni, GetCreatedJavaVMs__entry, \
3405 vm_buf, bufLen, numVMs);
3406 if (vm_created) {
3407 if (numVMs != NULL) *numVMs = 1;
3408 if (bufLen > 0) *vm_buf = (JavaVM *)(&main_vm);
3409 } else {
3410 if (numVMs != NULL) *numVMs = 0;
3411 }
3412 HS_DTRACE_PROBE1(hotspot_jni, GetCreatedJavaVMs__return, JNI_OK);
3413 return JNI_OK;
3414 }
3415
3416 extern "C" {
3417
3418 DT_RETURN_MARK_DECL(DestroyJavaVM, jint);
3419
3420 jint JNICALL jni_DestroyJavaVM(JavaVM *vm) {
3421 DTRACE_PROBE1(hotspot_jni, DestroyJavaVM__entry, vm);
3422 jint res = JNI_ERR;
3423 DT_RETURN_MARK(DestroyJavaVM, jint, (const jint&)res);
3424
3425 if (!vm_created) {
3426 res = JNI_ERR;
3427 return res;
3428 }
3429
3430 JNIWrapper("DestroyJavaVM");
3431 JNIEnv *env;
3432 JavaVMAttachArgs destroyargs;
3433 destroyargs.version = CurrentVersion;
3434 destroyargs.name = (char *)"DestroyJavaVM";
3435 destroyargs.group = NULL;
3436 res = vm->AttachCurrentThread((void **)&env, (void *)&destroyargs);
3437 if (res != JNI_OK) {
3438 return res;
3439 }
3440
3441 // Since this is not a JVM_ENTRY we have to set the thread state manually before entering.
3442 JavaThread* thread = JavaThread::current();
3443 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3444 if (Threads::destroy_vm()) {
3445 // Should not change thread state, VM is gone
3446 vm_created = false;
3447 res = JNI_OK;
3448 return res;
3449 } else {
3450 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3451 res = JNI_ERR;
3452 return res;
3453 }
3454 }
3455
3456
3457 static jint attach_current_thread(JavaVM *vm, void **penv, void *_args, bool daemon) {
3458 JavaVMAttachArgs *args = (JavaVMAttachArgs *) _args;
3459
3460 // Check below commented out from JDK1.2fcs as well
3461 /*
3462 if (args && (args->version != JNI_VERSION_1_1 || args->version != JNI_VERSION_1_2)) {
3463 return JNI_EVERSION;
3464 }
3465 */
3466
3467 Thread* t = ThreadLocalStorage::get_thread_slow();
3468 if (t != NULL) {
3469 // If the thread has been attached this operation is a no-op
3470 *(JNIEnv**)penv = ((JavaThread*) t)->jni_environment();
3471 return JNI_OK;
3472 }
3473
3474 // Create a thread and mark it as attaching so it will be skipped by the
3475 // ThreadsListEnumerator - see CR 6404306
3476 JavaThread* thread = new JavaThread(true);
3477
3478 // Set correct safepoint info. The thread is going to call into Java when
3479 // initializing the Java level thread object. Hence, the correct state must
3480 // be set in order for the Safepoint code to deal with it correctly.
3481 thread->set_thread_state(_thread_in_vm);
3482 // Must do this before initialize_thread_local_storage
3483 thread->record_stack_base_and_size();
3484
3485 thread->initialize_thread_local_storage();
3486
3487 if (!os::create_attached_thread(thread)) {
3488 delete thread;
3489 return JNI_ERR;
3490 }
3491 // Enable stack overflow checks
3492 thread->create_stack_guard_pages();
3493
3494 thread->initialize_tlab();
3495
3496 thread->cache_global_variables();
3497
3498 // Crucial that we do not have a safepoint check for this thread, since it has
3499 // not been added to the Thread list yet.
3500 { Threads_lock->lock_without_safepoint_check();
3501 // This must be inside this lock in order to get FullGCALot to work properly, i.e., to
3502 // avoid this thread trying to do a GC before it is added to the thread-list
3503 thread->set_active_handles(JNIHandleBlock::allocate_block());
3504 Threads::add(thread, daemon);
3505 Threads_lock->unlock();
3506 }
3507 // Create thread group and name info from attach arguments
3508 oop group = NULL;
3509 char* thread_name = NULL;
3510 if (args != NULL && Threads::is_supported_jni_version(args->version)) {
3511 group = JNIHandles::resolve(args->group);
3512 thread_name = args->name; // may be NULL
3513 }
3514 if (group == NULL) group = Universe::main_thread_group();
3515
3516 // Create Java level thread object and attach it to this thread
3517 bool attach_failed = false;
3518 {
3519 EXCEPTION_MARK;
3520 HandleMark hm(THREAD);
3521 Handle thread_group(THREAD, group);
3522 thread->allocate_threadObj(thread_group, thread_name, daemon, THREAD);
3523 if (HAS_PENDING_EXCEPTION) {
3524 CLEAR_PENDING_EXCEPTION;
3525 // cleanup outside the handle mark.
3526 attach_failed = true;
3527 }
3528 }
3529
3530 if (attach_failed) {
3531 // Added missing cleanup
3532 thread->cleanup_failed_attach_current_thread();
3533 return JNI_ERR;
3534 }
3535
3536 // mark the thread as no longer attaching
3537 // this uses a fence to push the change through so we don't have
3538 // to regrab the threads_lock
3539 thread->set_attached();
3540
3541 // Set java thread status.
3542 java_lang_Thread::set_thread_status(thread->threadObj(),
3543 java_lang_Thread::RUNNABLE);
3544
3545 // Notify the debugger
3546 if (JvmtiExport::should_post_thread_life()) {
3547 JvmtiExport::post_thread_start(thread);
3548 }
3549
3550 *(JNIEnv**)penv = thread->jni_environment();
3551
3552 // Now leaving the VM, so change thread_state. This is normally automatically taken care
3553 // of in the JVM_ENTRY. But in this situation we have to do it manually. Notice, that by
3554 // using ThreadStateTransition::transition, we do a callback to the safepoint code if
3555 // needed.
3556
3557 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3558
3559 // Perform any platform dependent FPU setup
3560 os::setup_fpu();
3561
3562 return JNI_OK;
3563 }
3564
3565
3566 jint JNICALL jni_AttachCurrentThread(JavaVM *vm, void **penv, void *_args) {
3567 DTRACE_PROBE3(hotspot_jni, AttachCurrentThread__entry, vm, penv, _args);
3568 if (!vm_created) {
3569 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, JNI_ERR);
3570 return JNI_ERR;
3571 }
3572
3573 JNIWrapper("AttachCurrentThread");
3574 jint ret = attach_current_thread(vm, penv, _args, false);
3575 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, ret);
3576 return ret;
3577 }
3578
3579
3580 jint JNICALL jni_DetachCurrentThread(JavaVM *vm) {
3581 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__entry, vm);
3582 VM_Exit::block_if_vm_exited();
3583
3584 JNIWrapper("DetachCurrentThread");
3585
3586 // If the thread has been deattacted the operations is a no-op
3587 if (ThreadLocalStorage::thread() == NULL) {
3588 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3589 return JNI_OK;
3590 }
3591
3592 JavaThread* thread = JavaThread::current();
3593 if (thread->has_last_Java_frame()) {
3594 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_ERR);
3595 // Can't detach a thread that's running java, that can't work.
3596 return JNI_ERR;
3597 }
3598
3599 // Safepoint support. Have to do call-back to safepoint code, if in the
3600 // middel of a safepoint operation
3601 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3602
3603 // XXX: Note that JavaThread::exit() call below removes the guards on the
3604 // stack pages set up via enable_stack_{red,yellow}_zone() calls
3605 // above in jni_AttachCurrentThread. Unfortunately, while the setting
3606 // of the guards is visible in jni_AttachCurrentThread above,
3607 // the removal of the guards is buried below in JavaThread::exit()
3608 // here. The abstraction should be more symmetrically either exposed
3609 // or hidden (e.g. it could probably be hidden in the same
3610 // (platform-dependent) methods where we do alternate stack
3611 // maintenance work?)
3612 thread->exit(false, JavaThread::jni_detach);
3613 delete thread;
3614
3615 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3616 return JNI_OK;
3617 }
3618
3619 DT_RETURN_MARK_DECL(GetEnv, jint);
3620
3621 jint JNICALL jni_GetEnv(JavaVM *vm, void **penv, jint version) {
3622 DTRACE_PROBE3(hotspot_jni, GetEnv__entry, vm, penv, version);
3623 jint ret = JNI_ERR;
3624 DT_RETURN_MARK(GetEnv, jint, (const jint&)ret);
3625
3626 if (!vm_created) {
3627 *penv = NULL;
3628 ret = JNI_EDETACHED;
3629 return ret;
3630 }
3631
3632 if (JvmtiExport::is_jvmti_version(version)) {
3633 ret = JvmtiExport::get_jvmti_interface(vm, penv, version);
3634 return ret;
3635 }
3636
3637 #ifndef JVMPI_VERSION_1
3638 // need these in order to be polite about older agents
3639 #define JVMPI_VERSION_1 ((jint)0x10000001)
3640 #define JVMPI_VERSION_1_1 ((jint)0x10000002)
3641 #define JVMPI_VERSION_1_2 ((jint)0x10000003)
3642 #endif // !JVMPI_VERSION_1
3643
3644 Thread* thread = ThreadLocalStorage::thread();
3645 if (thread != NULL && thread->is_Java_thread()) {
3646 if (Threads::is_supported_jni_version_including_1_1(version)) {
3647 *(JNIEnv**)penv = ((JavaThread*) thread)->jni_environment();
3648 ret = JNI_OK;
3649 return ret;
3650
3651 } else if (version == JVMPI_VERSION_1 ||
3652 version == JVMPI_VERSION_1_1 ||
3653 version == JVMPI_VERSION_1_2) {
3654 tty->print_cr("ERROR: JVMPI, an experimental interface, is no longer supported.");
3655 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3656 ret = JNI_EVERSION;
3657 return ret;
3658 } else if (JvmtiExport::is_jvmdi_version(version)) {
3659 tty->print_cr("FATAL ERROR: JVMDI is no longer supported.");
3660 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3661 ret = JNI_EVERSION;
3662 return ret;
3663 } else {
3664 *penv = NULL;
3665 ret = JNI_EVERSION;
3666 return ret;
3667 }
3668 } else {
3669 *penv = NULL;
3670 ret = JNI_EDETACHED;
3671 return ret;
3672 }
3673 }
3674
3675
3676 jint JNICALL jni_AttachCurrentThreadAsDaemon(JavaVM *vm, void **penv, void *_args) {
3677 DTRACE_PROBE3(hotspot_jni, AttachCurrentThreadAsDaemon__entry, vm, penv, _args);
3678 if (!vm_created) {
3679 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, JNI_ERR);
3680 return JNI_ERR;
3681 }
3682
3683 JNIWrapper("AttachCurrentThreadAsDaemon");
3684 jint ret = attach_current_thread(vm, penv, _args, true);
3685 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, ret);
3686 return ret;
3687 }
3688
3689
3690 } // End extern "C"
3691
3692 const struct JNIInvokeInterface_ jni_InvokeInterface = {
3693 NULL,
3694 NULL,
3695 NULL,
3696
3697 jni_DestroyJavaVM,
3698 jni_AttachCurrentThread,
3699 jni_DetachCurrentThread,
3700 jni_GetEnv,
3701 jni_AttachCurrentThreadAsDaemon
3702 };