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 #include "memory/allocation.inline.hpp"
33 #include "memory/gcLocker.inline.hpp"
34 #include "memory/oopFactory.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/instanceKlass.hpp"
37 #include "oops/instanceOop.hpp"
38 #include "oops/markOop.hpp"
39 #include "oops/methodOop.hpp"
40 #include "oops/objArrayKlass.hpp"
41 #include "oops/objArrayOop.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "oops/symbol.hpp"
44 #include "oops/typeArrayKlass.hpp"
45 #include "oops/typeArrayOop.hpp"
46 #include "prims/jni.h"
47 #include "prims/jniCheck.hpp"
48 #include "prims/jniFastGetField.hpp"
49 #include "prims/jvm.h"
50 #include "prims/jvm_misc.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "prims/jvmtiThreadState.hpp"
53 #include "runtime/compilationPolicy.hpp"
54 #include "runtime/fieldDescriptor.hpp"
55 #include "runtime/fprofiler.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/interfaceSupport.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/jfieldIDWorkaround.hpp"
61 #include "runtime/reflection.hpp"
62 #include "runtime/sharedRuntime.hpp"
63 #include "runtime/signature.hpp"
64 #include "runtime/vm_operations.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/dtrace.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/histogram.hpp"
70 #ifdef TARGET_ARCH_x86
71 # include "jniTypes_x86.hpp"
72 #endif
73 #ifdef TARGET_ARCH_sparc
74 # include "jniTypes_sparc.hpp"
75 #endif
76 #ifdef TARGET_ARCH_zero
77 # include "jniTypes_zero.hpp"
78 #endif
79 #ifdef TARGET_OS_FAMILY_linux
80 # include "os_linux.inline.hpp"
81 # include "thread_linux.inline.hpp"
82 #endif
83 #ifdef TARGET_OS_FAMILY_solaris
84 # include "os_solaris.inline.hpp"
85 # include "thread_solaris.inline.hpp"
86 #endif
87 #ifdef TARGET_OS_FAMILY_windows
88 # include "os_windows.inline.hpp"
89 # include "thread_windows.inline.hpp"
90 #endif
91
92 static jint CurrentVersion = JNI_VERSION_1_6;
93
94
95 // The DT_RETURN_MARK macros create a scoped object to fire the dtrace
96 // '-return' probe regardless of the return path is taken out of the function.
97 // Methods that have multiple return paths use this to avoid having to
98 // instrument each return path. Methods that use CHECK or THROW must use this
99 // since those macros can cause an immedate uninstrumented return.
100 //
101 // In order to get the return value, a reference to the variable containing
102 // the return value must be passed to the contructor of the object, and
103 // the return value must be set before return (since the mark object has
104 // a reference to it).
105 //
106 // Example:
107 // DT_RETURN_MARK_DECL(SomeFunc, int);
108 // JNI_ENTRY(int, SomeFunc, ...)
109 // int return_value = 0;
110 // DT_RETURN_MARK(SomeFunc, int, (const int&)return_value);
111 // foo(CHECK_0)
112 // return_value = 5;
113 // return return_value;
114 // JNI_END
115 #define DT_RETURN_MARK_DECL(name, type) \
116 HS_DTRACE_PROBE_DECL1(hotspot_jni, name##__return, type); \
117 DTRACE_ONLY( \
118 class DTraceReturnProbeMark_##name { \
119 public: \
120 const type& _ret_ref; \
121 DTraceReturnProbeMark_##name(const type& v) : _ret_ref(v) {} \
122 ~DTraceReturnProbeMark_##name() { \
123 HS_DTRACE_PROBE1(hotspot_jni, name##__return, _ret_ref); \
124 } \
125 } \
126 )
127 // Void functions are simpler since there's no return value
128 #define DT_VOID_RETURN_MARK_DECL(name) \
129 HS_DTRACE_PROBE_DECL0(hotspot_jni, name##__return); \
130 DTRACE_ONLY( \
131 class DTraceReturnProbeMark_##name { \
132 public: \
133 ~DTraceReturnProbeMark_##name() { \
134 HS_DTRACE_PROBE0(hotspot_jni, name##__return); \
135 } \
136 } \
137 )
138
139
140 // Place these macros in the function to mark the return. Non-void
141 // functions need the type and address of the return value.
142 #define DT_RETURN_MARK(name, type, ref) \
143 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark(ref) )
144 #define DT_VOID_RETURN_MARK(name) \
145 DTRACE_ONLY( DTraceReturnProbeMark_##name dtrace_return_mark )
146
147
148 // Use these to select distinct code for floating-point vs. non-floating point
149 // situations. Used from within common macros where we need slightly
150 // different behavior for Float/Double
151 #define FP_SELECT_Boolean(intcode, fpcode) intcode
152 #define FP_SELECT_Byte(intcode, fpcode) intcode
153 #define FP_SELECT_Char(intcode, fpcode) intcode
154 #define FP_SELECT_Short(intcode, fpcode) intcode
155 #define FP_SELECT_Object(intcode, fpcode) intcode
156 #define FP_SELECT_Int(intcode, fpcode) intcode
157 #define FP_SELECT_Long(intcode, fpcode) intcode
158 #define FP_SELECT_Float(intcode, fpcode) fpcode
159 #define FP_SELECT_Double(intcode, fpcode) fpcode
160 #define FP_SELECT(TypeName, intcode, fpcode) \
161 FP_SELECT_##TypeName(intcode, fpcode)
162
163 #define COMMA ,
164
165 // Choose DT_RETURN_MARK macros based on the type: float/double -> void
166 // (dtrace doesn't do FP yet)
167 #define DT_RETURN_MARK_DECL_FOR(TypeName, name, type) \
168 FP_SELECT(TypeName, \
169 DT_RETURN_MARK_DECL(name, type), DT_VOID_RETURN_MARK_DECL(name) )
170 #define DT_RETURN_MARK_FOR(TypeName, name, type, ref) \
171 FP_SELECT(TypeName, \
172 DT_RETURN_MARK(name, type, ref), DT_VOID_RETURN_MARK(name) )
173
174
175 // out-of-line helpers for class jfieldIDWorkaround:
176
177 bool jfieldIDWorkaround::is_valid_jfieldID(klassOop k, jfieldID id) {
178 if (jfieldIDWorkaround::is_instance_jfieldID(k, id)) {
179 uintptr_t as_uint = (uintptr_t) id;
180 intptr_t offset = raw_instance_offset(id);
181 if (is_checked_jfieldID(id)) {
182 if (!klass_hash_ok(k, id)) {
183 return false;
184 }
185 }
186 return instanceKlass::cast(k)->contains_field_offset(offset);
187 } else {
188 JNIid* result = (JNIid*) id;
189 #ifdef ASSERT
190 return result != NULL && result->is_static_field_id();
191 #else
192 return result != NULL;
193 #endif
194 }
195 }
196
197
198 intptr_t jfieldIDWorkaround::encode_klass_hash(klassOop k, intptr_t offset) {
199 if (offset <= small_offset_mask) {
200 klassOop field_klass = k;
201 klassOop super_klass = Klass::cast(field_klass)->super();
202 // With compressed oops the most super class with nonstatic fields would
203 // be the owner of fields embedded in the header.
204 while (instanceKlass::cast(super_klass)->has_nonstatic_fields() &&
205 instanceKlass::cast(super_klass)->contains_field_offset(offset)) {
206 field_klass = super_klass; // super contains the field also
207 super_klass = Klass::cast(field_klass)->super();
208 }
209 debug_only(No_Safepoint_Verifier nosafepoint;)
210 uintptr_t klass_hash = field_klass->identity_hash();
211 return ((klass_hash & klass_mask) << klass_shift) | checked_mask_in_place;
212 } else {
213 #if 0
214 #ifndef PRODUCT
215 {
216 ResourceMark rm;
217 warning("VerifyJNIFields: long offset %d in %s", offset, Klass::cast(k)->external_name());
218 }
219 #endif
220 #endif
221 return 0;
222 }
223 }
224
225 bool jfieldIDWorkaround::klass_hash_ok(klassOop k, jfieldID id) {
226 uintptr_t as_uint = (uintptr_t) id;
227 intptr_t klass_hash = (as_uint >> klass_shift) & klass_mask;
228 do {
229 debug_only(No_Safepoint_Verifier nosafepoint;)
230 // Could use a non-blocking query for identity_hash here...
231 if ((k->identity_hash() & klass_mask) == klass_hash)
232 return true;
233 k = Klass::cast(k)->super();
234 } while (k != NULL);
235 return false;
236 }
237
238 void jfieldIDWorkaround::verify_instance_jfieldID(klassOop k, jfieldID id) {
239 guarantee(jfieldIDWorkaround::is_instance_jfieldID(k, id), "must be an instance field" );
240 uintptr_t as_uint = (uintptr_t) id;
241 intptr_t offset = raw_instance_offset(id);
242 if (VerifyJNIFields) {
243 if (is_checked_jfieldID(id)) {
244 guarantee(klass_hash_ok(k, id),
245 "Bug in native code: jfieldID class must match object");
246 } else {
247 #if 0
248 #ifndef PRODUCT
249 if (Verbose) {
250 ResourceMark rm;
251 warning("VerifyJNIFields: unverified offset %d for %s", offset, Klass::cast(k)->external_name());
252 }
253 #endif
254 #endif
255 }
256 }
257 guarantee(instanceKlass::cast(k)->contains_field_offset(offset),
258 "Bug in native code: jfieldID offset must address interior of object");
259 }
260
261 // Pick a reasonable higher bound for local capacity requested
262 // for EnsureLocalCapacity and PushLocalFrame. We don't want it too
263 // high because a test (or very unusual application) may try to allocate
264 // that many handles and run out of swap space. An implementation is
265 // permitted to allocate more handles than the ensured capacity, so this
266 // value is set high enough to prevent compatibility problems.
267 const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K;
268
269
270 // Wrapper to trace JNI functions
271
272 #ifdef ASSERT
273 Histogram* JNIHistogram;
274 static volatile jint JNIHistogram_lock = 0;
275
276 class JNITraceWrapper : public StackObj {
277 public:
278 JNITraceWrapper(const char* format, ...) {
279 if (TraceJNICalls) {
280 va_list ap;
281 va_start(ap, format);
282 tty->print("JNI ");
283 tty->vprint_cr(format, ap);
284 va_end(ap);
285 }
286 }
287 };
288
289 class JNIHistogramElement : public HistogramElement {
290 public:
291 JNIHistogramElement(const char* name);
292 };
293
294 JNIHistogramElement::JNIHistogramElement(const char* elementName) {
295 _name = elementName;
296 uintx count = 0;
297
298 while (Atomic::cmpxchg(1, &JNIHistogram_lock, 0) != 0) {
299 while (OrderAccess::load_acquire(&JNIHistogram_lock) != 0) {
300 count +=1;
301 if ( (WarnOnStalledSpinLock > 0)
302 && (count % WarnOnStalledSpinLock == 0)) {
303 warning("JNIHistogram_lock seems to be stalled");
304 }
305 }
306 }
307
308
309 if(JNIHistogram == NULL)
310 JNIHistogram = new Histogram("JNI Call Counts",100);
311
312 JNIHistogram->add_element(this);
313 Atomic::dec(&JNIHistogram_lock);
314 }
315
316 #define JNICountWrapper(arg) \
317 static JNIHistogramElement* e = new JNIHistogramElement(arg); \
318 /* There is a MT-race condition in VC++. So we need to make sure that that e has been initialized */ \
319 if (e != NULL) e->increment_count()
320 #define JNIWrapper(arg) JNICountWrapper(arg); JNITraceWrapper(arg)
321 #else
322 #define JNIWrapper(arg)
323 #endif
324
325
326 // Implementation of JNI entries
327
328 DT_RETURN_MARK_DECL(DefineClass, jclass);
329
330 JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef,
331 const jbyte *buf, jsize bufLen))
332 JNIWrapper("DefineClass");
333
334 DTRACE_PROBE5(hotspot_jni, DefineClass__entry,
335 env, name, loaderRef, buf, bufLen);
336 jclass cls = NULL;
337 DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls);
338
339 // Since exceptions can be thrown, class initialization can take place
340 // if name is NULL no check for class name in .class stream has to be made.
341 if (name != NULL) {
342 const int str_len = (int)strlen(name);
343 if (str_len > Symbol::max_length()) {
344 // It's impossible to create this class; the name cannot fit
345 // into the constant pool.
346 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
347 }
348 }
349 TempNewSymbol class_name = SymbolTable::new_symbol(name, THREAD);
350
351 ResourceMark rm(THREAD);
352 ClassFileStream st((u1*) buf, bufLen, NULL);
353 Handle class_loader (THREAD, JNIHandles::resolve(loaderRef));
354
355 if (UsePerfData && !class_loader.is_null()) {
356 // check whether the current caller thread holds the lock or not.
357 // If not, increment the corresponding counter
358 if (ObjectSynchronizer::
359 query_lock_ownership((JavaThread*)THREAD, class_loader) !=
360 ObjectSynchronizer::owner_self) {
361 ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc();
362 }
363 }
364 klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
365 Handle(), &st, true,
366 CHECK_NULL);
367
368 if (TraceClassResolution && k != NULL) {
369 trace_class_resolution(k);
370 }
371
372 cls = (jclass)JNIHandles::make_local(
373 env, Klass::cast(k)->java_mirror());
374 return cls;
375 JNI_END
376
377
378
379 static bool first_time_FindClass = true;
380
381 DT_RETURN_MARK_DECL(FindClass, jclass);
382
383 JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name))
384 JNIWrapper("FindClass");
385 DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name);
386
387 jclass result = NULL;
388 DT_RETURN_MARK(FindClass, jclass, (const jclass&)result);
389
390 // Remember if we are the first invocation of jni_FindClass
391 bool first_time = first_time_FindClass;
392 first_time_FindClass = false;
393
394 // Sanity check the name: it cannot be null or larger than the maximum size
395 // name we can fit in the constant pool.
396 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
397 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
398 }
399
400 //%note jni_3
401 Handle loader;
402 Handle protection_domain;
403 // Find calling class
404 instanceKlassHandle k (THREAD, thread->security_get_caller_class(0));
405 if (k.not_null()) {
406 loader = Handle(THREAD, k->class_loader());
407 // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed
408 // in the correct class context.
409 if (loader.is_null() &&
410 k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
411 JavaValue result(T_OBJECT);
412 JavaCalls::call_static(&result, k,
413 vmSymbols::getFromClass_name(),
414 vmSymbols::void_class_signature(),
415 thread);
416 if (HAS_PENDING_EXCEPTION) {
417 Handle ex(thread, thread->pending_exception());
418 CLEAR_PENDING_EXCEPTION;
419 THROW_HANDLE_0(ex);
420 }
421 oop mirror = (oop) result.get_jobject();
422 loader = Handle(THREAD,
423 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader());
424 protection_domain = Handle(THREAD,
425 instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain());
426 }
427 } else {
428 // We call ClassLoader.getSystemClassLoader to obtain the system class loader.
429 loader = Handle(THREAD, SystemDictionary::java_system_loader());
430 }
431
432 TempNewSymbol sym = SymbolTable::new_symbol(name, CHECK_NULL);
433 result = find_class_from_class_loader(env, sym, true, loader,
434 protection_domain, true, thread);
435
436 if (TraceClassResolution && result != NULL) {
437 trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
438 }
439
440 // If we were the first invocation of jni_FindClass, we enable compilation again
441 // rather than just allowing invocation counter to overflow and decay.
442 // Controlled by flag DelayCompilationDuringStartup.
443 if (first_time && !CompileTheWorld)
444 CompilationPolicy::completed_vm_startup();
445
446 return result;
447 JNI_END
448
449 DT_RETURN_MARK_DECL(FromReflectedMethod, jmethodID);
450
451 JNI_ENTRY(jmethodID, jni_FromReflectedMethod(JNIEnv *env, jobject method))
452 JNIWrapper("FromReflectedMethod");
453 DTRACE_PROBE2(hotspot_jni, FromReflectedMethod__entry, env, method);
454 jmethodID ret = NULL;
455 DT_RETURN_MARK(FromReflectedMethod, jmethodID, (const jmethodID&)ret);
456
457 // method is a handle to a java.lang.reflect.Method object
458 oop reflected = JNIHandles::resolve_non_null(method);
459 oop mirror = NULL;
460 int slot = 0;
461
462 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
463 mirror = java_lang_reflect_Constructor::clazz(reflected);
464 slot = java_lang_reflect_Constructor::slot(reflected);
465 } else {
466 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(), "wrong type");
467 mirror = java_lang_reflect_Method::clazz(reflected);
468 slot = java_lang_reflect_Method::slot(reflected);
469 }
470 klassOop k = java_lang_Class::as_klassOop(mirror);
471
472 KlassHandle k1(THREAD, k);
473 // Make sure class is initialized before handing id's out to methods
474 Klass::cast(k1())->initialize(CHECK_NULL);
475 methodOop m = instanceKlass::cast(k1())->method_with_idnum(slot);
476 ret = m==NULL? NULL : m->jmethod_id(); // return NULL if reflected method deleted
477 return ret;
478 JNI_END
479
480 DT_RETURN_MARK_DECL(FromReflectedField, jfieldID);
481
482 JNI_ENTRY(jfieldID, jni_FromReflectedField(JNIEnv *env, jobject field))
483 JNIWrapper("FromReflectedField");
484 DTRACE_PROBE2(hotspot_jni, FromReflectedField__entry, env, field);
485 jfieldID ret = NULL;
486 DT_RETURN_MARK(FromReflectedField, jfieldID, (const jfieldID&)ret);
487
488 // field is a handle to a java.lang.reflect.Field object
489 oop reflected = JNIHandles::resolve_non_null(field);
490 oop mirror = java_lang_reflect_Field::clazz(reflected);
491 klassOop k = java_lang_Class::as_klassOop(mirror);
492 int slot = java_lang_reflect_Field::slot(reflected);
493 int modifiers = java_lang_reflect_Field::modifiers(reflected);
494
495 KlassHandle k1(THREAD, k);
496 // Make sure class is initialized before handing id's out to fields
497 Klass::cast(k1())->initialize(CHECK_NULL);
498
499 // First check if this is a static field
500 if (modifiers & JVM_ACC_STATIC) {
501 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
502 JNIid* id = instanceKlass::cast(k1())->jni_id_for(offset);
503 assert(id != NULL, "corrupt Field object");
504 debug_only(id->set_is_static_field_id();)
505 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
506 ret = jfieldIDWorkaround::to_static_jfieldID(id);
507 return ret;
508 }
509
510 // The slot is the index of the field description in the field-array
511 // The jfieldID is the offset of the field within the object
512 // It may also have hash bits for k, if VerifyJNIFields is turned on.
513 intptr_t offset = instanceKlass::cast(k1())->offset_from_fields( slot );
514 assert(instanceKlass::cast(k1())->contains_field_offset(offset), "stay within object");
515 ret = jfieldIDWorkaround::to_instance_jfieldID(k1(), offset);
516 return ret;
517 JNI_END
518
519 DT_RETURN_MARK_DECL(ToReflectedMethod, jobject);
520
521 JNI_ENTRY(jobject, jni_ToReflectedMethod(JNIEnv *env, jclass cls, jmethodID method_id, jboolean isStatic))
522 JNIWrapper("ToReflectedMethod");
523 DTRACE_PROBE4(hotspot_jni, ToReflectedMethod__entry, env, cls, method_id, isStatic);
524 jobject ret = NULL;
525 DT_RETURN_MARK(ToReflectedMethod, jobject, (const jobject&)ret);
526
527 methodHandle m (THREAD, JNIHandles::resolve_jmethod_id(method_id));
528 assert(m->is_static() == (isStatic != 0), "jni_ToReflectedMethod access flags doesn't match");
529 oop reflection_method;
530 if (m->is_initializer()) {
531 reflection_method = Reflection::new_constructor(m, CHECK_NULL);
532 } else {
533 reflection_method = Reflection::new_method(m, UseNewReflection, false, CHECK_NULL);
534 }
535 ret = JNIHandles::make_local(env, reflection_method);
536 return ret;
537 JNI_END
538
539 DT_RETURN_MARK_DECL(GetSuperclass, jclass);
540
541 JNI_ENTRY(jclass, jni_GetSuperclass(JNIEnv *env, jclass sub))
542 JNIWrapper("GetSuperclass");
543 DTRACE_PROBE2(hotspot_jni, GetSuperclass__entry, env, sub);
544 jclass obj = NULL;
545 DT_RETURN_MARK(GetSuperclass, jclass, (const jclass&)obj);
546
547 oop mirror = JNIHandles::resolve_non_null(sub);
548 // primitive classes return NULL
549 if (java_lang_Class::is_primitive(mirror)) return NULL;
550
551 // Rules of Class.getSuperClass as implemented by KLass::java_super:
552 // arrays return Object
553 // interfaces return NULL
554 // proper classes return Klass::super()
555 klassOop k = java_lang_Class::as_klassOop(mirror);
556 if (Klass::cast(k)->is_interface()) return NULL;
557
558 // return mirror for superclass
559 klassOop super = Klass::cast(k)->java_super();
560 // super2 is the value computed by the compiler's getSuperClass intrinsic:
561 debug_only(klassOop super2 = ( Klass::cast(k)->oop_is_javaArray()
562 ? SystemDictionary::Object_klass()
563 : Klass::cast(k)->super() ) );
564 assert(super == super2,
565 "java_super computation depends on interface, array, other super");
566 obj = (super == NULL) ? NULL : (jclass) JNIHandles::make_local(Klass::cast(super)->java_mirror());
567 return obj;
568 JNI_END
569
570 JNI_QUICK_ENTRY(jboolean, jni_IsAssignableFrom(JNIEnv *env, jclass sub, jclass super))
571 JNIWrapper("IsSubclassOf");
572 DTRACE_PROBE3(hotspot_jni, IsAssignableFrom__entry, env, sub, super);
573 oop sub_mirror = JNIHandles::resolve_non_null(sub);
574 oop super_mirror = JNIHandles::resolve_non_null(super);
575 if (java_lang_Class::is_primitive(sub_mirror) ||
576 java_lang_Class::is_primitive(super_mirror)) {
577 jboolean ret = (sub_mirror == super_mirror);
578 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
579 return ret;
580 }
581 klassOop sub_klass = java_lang_Class::as_klassOop(sub_mirror);
582 klassOop super_klass = java_lang_Class::as_klassOop(super_mirror);
583 assert(sub_klass != NULL && super_klass != NULL, "invalid arguments to jni_IsAssignableFrom");
584 jboolean ret = Klass::cast(sub_klass)->is_subtype_of(super_klass) ?
585 JNI_TRUE : JNI_FALSE;
586 DTRACE_PROBE1(hotspot_jni, IsAssignableFrom__return, ret);
587 return ret;
588 JNI_END
589
590 DT_RETURN_MARK_DECL(Throw, jint);
591
592 JNI_ENTRY(jint, jni_Throw(JNIEnv *env, jthrowable obj))
593 JNIWrapper("Throw");
594 DTRACE_PROBE2(hotspot_jni, Throw__entry, env, obj);
595 jint ret = JNI_OK;
596 DT_RETURN_MARK(Throw, jint, (const jint&)ret);
597
598 THROW_OOP_(JNIHandles::resolve(obj), JNI_OK);
599 ShouldNotReachHere();
600 JNI_END
601
602 DT_RETURN_MARK_DECL(ThrowNew, jint);
603
604 JNI_ENTRY(jint, jni_ThrowNew(JNIEnv *env, jclass clazz, const char *message))
605 JNIWrapper("ThrowNew");
606 DTRACE_PROBE3(hotspot_jni, ThrowNew__entry, env, clazz, message);
607 jint ret = JNI_OK;
608 DT_RETURN_MARK(ThrowNew, jint, (const jint&)ret);
609
610 instanceKlass* k = instanceKlass::cast(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
611 Symbol* name = k->name();
612 Handle class_loader (THREAD, k->class_loader());
613 Handle protection_domain (THREAD, k->protection_domain());
614 THROW_MSG_LOADER_(name, (char *)message, class_loader, protection_domain, JNI_OK);
615 ShouldNotReachHere();
616 JNI_END
617
618
619 // JNI functions only transform a pending async exception to a synchronous
620 // exception in ExceptionOccurred and ExceptionCheck calls, since
621 // delivering an async exception in other places won't change the native
622 // code's control flow and would be harmful when native code further calls
623 // JNI functions with a pending exception. Async exception is also checked
624 // during the call, so ExceptionOccurred/ExceptionCheck won't return
625 // false but deliver the async exception at the very end during
626 // state transition.
627
628 static void jni_check_async_exceptions(JavaThread *thread) {
629 assert(thread == Thread::current(), "must be itself");
630 thread->check_and_handle_async_exceptions();
631 }
632
633 JNI_ENTRY_NO_PRESERVE(jthrowable, jni_ExceptionOccurred(JNIEnv *env))
634 JNIWrapper("ExceptionOccurred");
635 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__entry, env);
636 jni_check_async_exceptions(thread);
637 oop exception = thread->pending_exception();
638 jthrowable ret = (jthrowable) JNIHandles::make_local(env, exception);
639 DTRACE_PROBE1(hotspot_jni, ExceptionOccurred__return, ret);
640 return ret;
641 JNI_END
642
643
644 JNI_ENTRY_NO_PRESERVE(void, jni_ExceptionDescribe(JNIEnv *env))
645 JNIWrapper("ExceptionDescribe");
646 DTRACE_PROBE1(hotspot_jni, ExceptionDescribe__entry, env);
647 if (thread->has_pending_exception()) {
648 Handle ex(thread, thread->pending_exception());
649 thread->clear_pending_exception();
650 if (ex->is_a(SystemDictionary::ThreadDeath_klass())) {
651 // Don't print anything if we are being killed.
652 } else {
653 jio_fprintf(defaultStream::error_stream(), "Exception ");
654 if (thread != NULL && thread->threadObj() != NULL) {
655 ResourceMark rm(THREAD);
656 jio_fprintf(defaultStream::error_stream(),
657 "in thread \"%s\" ", thread->get_thread_name());
658 }
659 if (ex->is_a(SystemDictionary::Throwable_klass())) {
660 JavaValue result(T_VOID);
661 JavaCalls::call_virtual(&result,
662 ex,
663 KlassHandle(THREAD,
664 SystemDictionary::Throwable_klass()),
665 vmSymbols::printStackTrace_name(),
666 vmSymbols::void_method_signature(),
667 THREAD);
668 // If an exception is thrown in the call it gets thrown away. Not much
669 // we can do with it. The native code that calls this, does not check
670 // for the exception - hence, it might still be in the thread when DestroyVM gets
671 // called, potentially causing a few asserts to trigger - since no pending exception
672 // is expected.
673 CLEAR_PENDING_EXCEPTION;
674 } else {
675 ResourceMark rm(THREAD);
676 jio_fprintf(defaultStream::error_stream(),
677 ". Uncaught exception of type %s.",
678 Klass::cast(ex->klass())->external_name());
679 }
680 }
681 }
682 DTRACE_PROBE(hotspot_jni, ExceptionDescribe__return);
683 JNI_END
684
685
686 JNI_QUICK_ENTRY(void, jni_ExceptionClear(JNIEnv *env))
687 JNIWrapper("ExceptionClear");
688 DTRACE_PROBE1(hotspot_jni, ExceptionClear__entry, env);
689
690 // The jni code might be using this API to clear java thrown exception.
691 // So just mark jvmti thread exception state as exception caught.
692 JvmtiThreadState *state = JavaThread::current()->jvmti_thread_state();
693 if (state != NULL && state->is_exception_detected()) {
694 state->set_exception_caught();
695 }
696 thread->clear_pending_exception();
697 DTRACE_PROBE(hotspot_jni, ExceptionClear__return);
698 JNI_END
699
700
701 JNI_ENTRY(void, jni_FatalError(JNIEnv *env, const char *msg))
702 JNIWrapper("FatalError");
703 DTRACE_PROBE2(hotspot_jni, FatalError__entry, env, msg);
704 tty->print_cr("FATAL ERROR in native method: %s", msg);
705 thread->print_stack();
706 os::abort(); // Dump core and abort
707 JNI_END
708
709
710 JNI_ENTRY(jint, jni_PushLocalFrame(JNIEnv *env, jint capacity))
711 JNIWrapper("PushLocalFrame");
712 DTRACE_PROBE2(hotspot_jni, PushLocalFrame__entry, env, capacity);
713 //%note jni_11
714 if (capacity < 0 && capacity > MAX_REASONABLE_LOCAL_CAPACITY) {
715 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, JNI_ERR);
716 return JNI_ERR;
717 }
718 JNIHandleBlock* old_handles = thread->active_handles();
719 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
720 assert(new_handles != NULL, "should not be NULL");
721 new_handles->set_pop_frame_link(old_handles);
722 thread->set_active_handles(new_handles);
723 jint ret = JNI_OK;
724 DTRACE_PROBE1(hotspot_jni, PushLocalFrame__return, ret);
725 return ret;
726 JNI_END
727
728
729 JNI_ENTRY(jobject, jni_PopLocalFrame(JNIEnv *env, jobject result))
730 JNIWrapper("PopLocalFrame");
731 DTRACE_PROBE2(hotspot_jni, PopLocalFrame__entry, env, result);
732 //%note jni_11
733 Handle result_handle(thread, JNIHandles::resolve(result));
734 JNIHandleBlock* old_handles = thread->active_handles();
735 JNIHandleBlock* new_handles = old_handles->pop_frame_link();
736 if (new_handles != NULL) {
737 // As a sanity check we only release the handle blocks if the pop_frame_link is not NULL.
738 // This way code will still work if PopLocalFrame is called without a corresponding
739 // PushLocalFrame call. Note that we set the pop_frame_link to NULL explicitly, otherwise
740 // the release_block call will release the blocks.
741 thread->set_active_handles(new_handles);
742 old_handles->set_pop_frame_link(NULL); // clear link we won't release new_handles below
743 JNIHandleBlock::release_block(old_handles, thread); // may block
744 result = JNIHandles::make_local(thread, result_handle());
745 }
746 DTRACE_PROBE1(hotspot_jni, PopLocalFrame__return, result);
747 return result;
748 JNI_END
749
750
751 JNI_ENTRY(jobject, jni_NewGlobalRef(JNIEnv *env, jobject ref))
752 JNIWrapper("NewGlobalRef");
753 DTRACE_PROBE2(hotspot_jni, NewGlobalRef__entry, env, ref);
754 Handle ref_handle(thread, JNIHandles::resolve(ref));
755 jobject ret = JNIHandles::make_global(ref_handle);
756 DTRACE_PROBE1(hotspot_jni, NewGlobalRef__return, ret);
757 return ret;
758 JNI_END
759
760 // Must be JNI_ENTRY (with HandleMark)
761 JNI_ENTRY_NO_PRESERVE(void, jni_DeleteGlobalRef(JNIEnv *env, jobject ref))
762 JNIWrapper("DeleteGlobalRef");
763 DTRACE_PROBE2(hotspot_jni, DeleteGlobalRef__entry, env, ref);
764 JNIHandles::destroy_global(ref);
765 DTRACE_PROBE(hotspot_jni, DeleteGlobalRef__return);
766 JNI_END
767
768 JNI_QUICK_ENTRY(void, jni_DeleteLocalRef(JNIEnv *env, jobject obj))
769 JNIWrapper("DeleteLocalRef");
770 DTRACE_PROBE2(hotspot_jni, DeleteLocalRef__entry, env, obj);
771 JNIHandles::destroy_local(obj);
772 DTRACE_PROBE(hotspot_jni, DeleteLocalRef__return);
773 JNI_END
774
775 JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2))
776 JNIWrapper("IsSameObject");
777 DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2);
778 oop a = JNIHandles::resolve(r1);
779 oop b = JNIHandles::resolve(r2);
780 jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE;
781 DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret);
782 return ret;
783 JNI_END
784
785
786 JNI_ENTRY(jobject, jni_NewLocalRef(JNIEnv *env, jobject ref))
787 JNIWrapper("NewLocalRef");
788 DTRACE_PROBE2(hotspot_jni, NewLocalRef__entry, env, ref);
789 jobject ret = JNIHandles::make_local(env, JNIHandles::resolve(ref));
790 DTRACE_PROBE1(hotspot_jni, NewLocalRef__return, ret);
791 return ret;
792 JNI_END
793
794 JNI_LEAF(jint, jni_EnsureLocalCapacity(JNIEnv *env, jint capacity))
795 JNIWrapper("EnsureLocalCapacity");
796 DTRACE_PROBE2(hotspot_jni, EnsureLocalCapacity__entry, env, capacity);
797 jint ret;
798 if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) {
799 ret = JNI_OK;
800 } else {
801 ret = JNI_ERR;
802 }
803 DTRACE_PROBE1(hotspot_jni, EnsureLocalCapacity__return, ret);
804 return ret;
805 JNI_END
806
807 // Return the Handle Type
808 JNI_LEAF(jobjectRefType, jni_GetObjectRefType(JNIEnv *env, jobject obj))
809 JNIWrapper("GetObjectRefType");
810 DTRACE_PROBE2(hotspot_jni, GetObjectRefType__entry, env, obj);
811 jobjectRefType ret;
812 if (JNIHandles::is_local_handle(thread, obj) ||
813 JNIHandles::is_frame_handle(thread, obj))
814 ret = JNILocalRefType;
815 else if (JNIHandles::is_global_handle(obj))
816 ret = JNIGlobalRefType;
817 else if (JNIHandles::is_weak_global_handle(obj))
818 ret = JNIWeakGlobalRefType;
819 else
820 ret = JNIInvalidRefType;
821 DTRACE_PROBE1(hotspot_jni, GetObjectRefType__return, ret);
822 return ret;
823 JNI_END
824
825
826 class JNI_ArgumentPusher : public SignatureIterator {
827 protected:
828 JavaCallArguments* _arguments;
829
830 virtual void get_bool () = 0;
831 virtual void get_char () = 0;
832 virtual void get_short () = 0;
833 virtual void get_byte () = 0;
834 virtual void get_int () = 0;
835 virtual void get_long () = 0;
836 virtual void get_float () = 0;
837 virtual void get_double () = 0;
838 virtual void get_object () = 0;
839
840 JNI_ArgumentPusher(Symbol* signature) : SignatureIterator(signature) {
841 this->_return_type = T_ILLEGAL;
842 _arguments = NULL;
843 }
844
845 public:
846 virtual void iterate( uint64_t fingerprint ) = 0;
847
848 void set_java_argument_object(JavaCallArguments *arguments) { _arguments = arguments; }
849
850 inline void do_bool() { if (!is_return_type()) get_bool(); }
851 inline void do_char() { if (!is_return_type()) get_char(); }
852 inline void do_short() { if (!is_return_type()) get_short(); }
853 inline void do_byte() { if (!is_return_type()) get_byte(); }
854 inline void do_int() { if (!is_return_type()) get_int(); }
855 inline void do_long() { if (!is_return_type()) get_long(); }
856 inline void do_float() { if (!is_return_type()) get_float(); }
857 inline void do_double() { if (!is_return_type()) get_double(); }
858 inline void do_object(int begin, int end) { if (!is_return_type()) get_object(); }
859 inline void do_array(int begin, int end) { if (!is_return_type()) get_object(); } // do_array uses get_object -- there is no get_array
860 inline void do_void() { }
861
862 JavaCallArguments* arguments() { return _arguments; }
863 void push_receiver(Handle h) { _arguments->push_oop(h); }
864 };
865
866
867 class JNI_ArgumentPusherVaArg : public JNI_ArgumentPusher {
868 protected:
869 va_list _ap;
870
871 inline void get_bool() { _arguments->push_int(va_arg(_ap, jint)); } // bool is coerced to int when using va_arg
872 inline void get_char() { _arguments->push_int(va_arg(_ap, jint)); } // char is coerced to int when using va_arg
873 inline void get_short() { _arguments->push_int(va_arg(_ap, jint)); } // short is coerced to int when using va_arg
874 inline void get_byte() { _arguments->push_int(va_arg(_ap, jint)); } // byte is coerced to int when using va_arg
875 inline void get_int() { _arguments->push_int(va_arg(_ap, jint)); }
876
877 // each of these paths is exercized by the various jck Call[Static,Nonvirtual,][Void,Int,..]Method[A,V,] tests
878
879 inline void get_long() { _arguments->push_long(va_arg(_ap, jlong)); }
880 inline void get_float() { _arguments->push_float((jfloat)va_arg(_ap, jdouble)); } // float is coerced to double w/ va_arg
881 inline void get_double() { _arguments->push_double(va_arg(_ap, jdouble)); }
882 inline void get_object() { jobject l = va_arg(_ap, jobject);
883 _arguments->push_oop(Handle((oop *)l, false)); }
884
885 inline void set_ap(va_list rap) {
886 #ifdef va_copy
887 va_copy(_ap, rap);
888 #elif defined (__va_copy)
889 __va_copy(_ap, rap);
890 #else
891 _ap = rap;
892 #endif
893 }
894
895 public:
896 JNI_ArgumentPusherVaArg(Symbol* signature, va_list rap)
897 : JNI_ArgumentPusher(signature) {
898 set_ap(rap);
899 }
900 JNI_ArgumentPusherVaArg(jmethodID method_id, va_list rap)
901 : JNI_ArgumentPusher(JNIHandles::resolve_jmethod_id(method_id)->signature()) {
902 set_ap(rap);
903 }
904
905 // Optimized path if we have the bitvector form of signature
906 void iterate( uint64_t fingerprint ) {
907 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate();// Must be too many arguments
908 else {
909 _return_type = (BasicType)((fingerprint >> static_feature_size) &
910 result_feature_mask);
911
912 assert(fingerprint, "Fingerprint should not be 0");
913 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
914 while ( 1 ) {
915 switch ( fingerprint & parameter_feature_mask ) {
916 case bool_parm:
917 case char_parm:
918 case short_parm:
919 case byte_parm:
920 case int_parm:
921 get_int();
922 break;
923 case obj_parm:
924 get_object();
925 break;
926 case long_parm:
927 get_long();
928 break;
929 case float_parm:
930 get_float();
931 break;
932 case double_parm:
933 get_double();
934 break;
935 case done_parm:
936 return;
937 break;
938 default:
939 ShouldNotReachHere();
940 break;
941 }
942 fingerprint >>= parameter_feature_size;
943 }
944 }
945 }
946 };
947
948
949 class JNI_ArgumentPusherArray : public JNI_ArgumentPusher {
950 protected:
951 const jvalue *_ap;
952
953 inline void get_bool() { _arguments->push_int((jint)(_ap++)->z); }
954 inline void get_char() { _arguments->push_int((jint)(_ap++)->c); }
955 inline void get_short() { _arguments->push_int((jint)(_ap++)->s); }
956 inline void get_byte() { _arguments->push_int((jint)(_ap++)->b); }
957 inline void get_int() { _arguments->push_int((jint)(_ap++)->i); }
958
959 inline void get_long() { _arguments->push_long((_ap++)->j); }
960 inline void get_float() { _arguments->push_float((_ap++)->f); }
961 inline void get_double() { _arguments->push_double((_ap++)->d);}
962 inline void get_object() { _arguments->push_oop(Handle((oop *)(_ap++)->l, false)); }
963
964 inline void set_ap(const jvalue *rap) { _ap = rap; }
965
966 public:
967 JNI_ArgumentPusherArray(Symbol* signature, const jvalue *rap)
968 : JNI_ArgumentPusher(signature) {
969 set_ap(rap);
970 }
971 JNI_ArgumentPusherArray(jmethodID method_id, const jvalue *rap)
972 : JNI_ArgumentPusher(JNIHandles::resolve_jmethod_id(method_id)->signature()) {
973 set_ap(rap);
974 }
975
976 // Optimized path if we have the bitvector form of signature
977 void iterate( uint64_t fingerprint ) {
978 if ( fingerprint == UCONST64(-1) ) SignatureIterator::iterate(); // Must be too many arguments
979 else {
980 _return_type = (BasicType)((fingerprint >> static_feature_size) &
981 result_feature_mask);
982 assert(fingerprint, "Fingerprint should not be 0");
983 fingerprint = fingerprint >> (static_feature_size + result_feature_size);
984 while ( 1 ) {
985 switch ( fingerprint & parameter_feature_mask ) {
986 case bool_parm:
987 get_bool();
988 break;
989 case char_parm:
990 get_char();
991 break;
992 case short_parm:
993 get_short();
994 break;
995 case byte_parm:
996 get_byte();
997 break;
998 case int_parm:
999 get_int();
1000 break;
1001 case obj_parm:
1002 get_object();
1003 break;
1004 case long_parm:
1005 get_long();
1006 break;
1007 case float_parm:
1008 get_float();
1009 break;
1010 case double_parm:
1011 get_double();
1012 break;
1013 case done_parm:
1014 return;
1015 break;
1016 default:
1017 ShouldNotReachHere();
1018 break;
1019 }
1020 fingerprint >>= parameter_feature_size;
1021 }
1022 }
1023 }
1024 };
1025
1026
1027 enum JNICallType {
1028 JNI_STATIC,
1029 JNI_VIRTUAL,
1030 JNI_NONVIRTUAL
1031 };
1032
1033 static methodHandle jni_resolve_interface_call(Handle recv, methodHandle method, TRAPS) {
1034 assert(!method.is_null() , "method should not be null");
1035
1036 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
1037 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
1038 KlassHandle spec_klass (THREAD, method->method_holder());
1039 Symbol* name = method->name();
1040 Symbol* signature = method->signature();
1041 CallInfo info;
1042 LinkResolver::resolve_interface_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
1043 return info.selected_method();
1044 }
1045
1046 static methodHandle jni_resolve_virtual_call(Handle recv, methodHandle method, TRAPS) {
1047 assert(!method.is_null() , "method should not be null");
1048
1049 KlassHandle recv_klass; // Default to NULL (use of ?: can confuse gcc)
1050 if (recv.not_null()) recv_klass = KlassHandle(THREAD, recv->klass());
1051 KlassHandle spec_klass (THREAD, method->method_holder());
1052 Symbol* name = method->name();
1053 Symbol* signature = method->signature();
1054 CallInfo info;
1055 LinkResolver::resolve_virtual_call(info, recv, recv_klass, spec_klass, name, signature, KlassHandle(), false, true, CHECK_(methodHandle()));
1056 return info.selected_method();
1057 }
1058
1059
1060
1061 static void jni_invoke_static(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
1062 methodHandle method(THREAD, JNIHandles::resolve_jmethod_id(method_id));
1063
1064 // Create object to hold arguments for the JavaCall, and associate it with
1065 // the jni parser
1066 ResourceMark rm(THREAD);
1067 int number_of_parameters = method->size_of_parameters();
1068 JavaCallArguments java_args(number_of_parameters);
1069 args->set_java_argument_object(&java_args);
1070
1071 assert(method->is_static(), "method should be static");
1072
1073 // Fill out JavaCallArguments object
1074 args->iterate( Fingerprinter(method).fingerprint() );
1075 // Initialize result type
1076 result->set_type(args->get_ret_type());
1077
1078 // Invoke the method. Result is returned as oop.
1079 JavaCalls::call(result, method, &java_args, CHECK);
1080
1081 // Convert result
1082 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1083 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1084 }
1085 }
1086
1087
1088 static void jni_invoke_nonstatic(JNIEnv *env, JavaValue* result, jobject receiver, JNICallType call_type, jmethodID method_id, JNI_ArgumentPusher *args, TRAPS) {
1089 oop recv = JNIHandles::resolve(receiver);
1090 if (recv == NULL) {
1091 THROW(vmSymbols::java_lang_NullPointerException());
1092 }
1093 Handle h_recv(THREAD, recv);
1094
1095 int number_of_parameters;
1096 methodOop selected_method;
1097 {
1098 methodOop m = JNIHandles::resolve_jmethod_id(method_id);
1099 number_of_parameters = m->size_of_parameters();
1100 klassOop holder = m->method_holder();
1101 if (!(Klass::cast(holder))->is_interface()) {
1102 // non-interface call -- for that little speed boost, don't handlize
1103 debug_only(No_Safepoint_Verifier nosafepoint;)
1104 if (call_type == JNI_VIRTUAL) {
1105 // jni_GetMethodID makes sure class is linked and initialized
1106 // so m should have a valid vtable index.
1107 int vtbl_index = m->vtable_index();
1108 if (vtbl_index != methodOopDesc::nonvirtual_vtable_index) {
1109 klassOop k = h_recv->klass();
1110 // k might be an arrayKlassOop but all vtables start at
1111 // the same place. The cast is to avoid virtual call and assertion.
1112 instanceKlass *ik = (instanceKlass*)k->klass_part();
1113 selected_method = ik->method_at_vtable(vtbl_index);
1114 } else {
1115 // final method
1116 selected_method = m;
1117 }
1118 } else {
1119 // JNI_NONVIRTUAL call
1120 selected_method = m;
1121 }
1122 } else {
1123 // interface call
1124 KlassHandle h_holder(THREAD, holder);
1125
1126 int itbl_index = m->cached_itable_index();
1127 if (itbl_index == -1) {
1128 itbl_index = klassItable::compute_itable_index(m);
1129 m->set_cached_itable_index(itbl_index);
1130 // the above may have grabbed a lock, 'm' and anything non-handlized can't be used again
1131 }
1132 klassOop k = h_recv->klass();
1133 selected_method = instanceKlass::cast(k)->method_at_itable(h_holder(), itbl_index, CHECK);
1134 }
1135 }
1136
1137 methodHandle method(THREAD, selected_method);
1138
1139 // Create object to hold arguments for the JavaCall, and associate it with
1140 // the jni parser
1141 ResourceMark rm(THREAD);
1142 JavaCallArguments java_args(number_of_parameters);
1143 args->set_java_argument_object(&java_args);
1144
1145 // handle arguments
1146 assert(!method->is_static(), "method should not be static");
1147 args->push_receiver(h_recv); // Push jobject handle
1148
1149 // Fill out JavaCallArguments object
1150 args->iterate( Fingerprinter(method).fingerprint() );
1151 // Initialize result type
1152 result->set_type(args->get_ret_type());
1153
1154 // Invoke the method. Result is returned as oop.
1155 JavaCalls::call(result, method, &java_args, CHECK);
1156
1157 // Convert result
1158 if (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY) {
1159 result->set_jobject(JNIHandles::make_local(env, (oop) result->get_jobject()));
1160 }
1161 }
1162
1163
1164 static instanceOop alloc_object(jclass clazz, TRAPS) {
1165 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1166 Klass::cast(k())->check_valid_for_instantiation(false, CHECK_NULL);
1167 instanceKlass::cast(k())->initialize(CHECK_NULL);
1168 instanceOop ih = instanceKlass::cast(k())->allocate_instance(THREAD);
1169 return ih;
1170 }
1171
1172 DT_RETURN_MARK_DECL(AllocObject, jobject);
1173
1174 JNI_ENTRY(jobject, jni_AllocObject(JNIEnv *env, jclass clazz))
1175 JNIWrapper("AllocObject");
1176
1177 DTRACE_PROBE2(hotspot_jni, AllocObject__entry, env, clazz);
1178 jobject ret = NULL;
1179 DT_RETURN_MARK(AllocObject, jobject, (const jobject&)ret);
1180
1181 instanceOop i = alloc_object(clazz, CHECK_NULL);
1182 ret = JNIHandles::make_local(env, i);
1183 return ret;
1184 JNI_END
1185
1186 DT_RETURN_MARK_DECL(NewObjectA, jobject);
1187
1188 JNI_ENTRY(jobject, jni_NewObjectA(JNIEnv *env, jclass clazz, jmethodID methodID, const jvalue *args))
1189 JNIWrapper("NewObjectA");
1190 DTRACE_PROBE3(hotspot_jni, NewObjectA__entry, env, clazz, methodID);
1191 jobject obj = NULL;
1192 DT_RETURN_MARK(NewObjectA, jobject, (const jobject)obj);
1193
1194 instanceOop i = alloc_object(clazz, CHECK_NULL);
1195 obj = JNIHandles::make_local(env, i);
1196 JavaValue jvalue(T_VOID);
1197 JNI_ArgumentPusherArray ap(methodID, args);
1198 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1199 return obj;
1200 JNI_END
1201
1202 DT_RETURN_MARK_DECL(NewObjectV, jobject);
1203
1204 JNI_ENTRY(jobject, jni_NewObjectV(JNIEnv *env, jclass clazz, jmethodID methodID, va_list args))
1205 JNIWrapper("NewObjectV");
1206 DTRACE_PROBE3(hotspot_jni, NewObjectV__entry, env, clazz, methodID);
1207 jobject obj = NULL;
1208 DT_RETURN_MARK(NewObjectV, jobject, (const jobject&)obj);
1209
1210 instanceOop i = alloc_object(clazz, CHECK_NULL);
1211 obj = JNIHandles::make_local(env, i);
1212 JavaValue jvalue(T_VOID);
1213 JNI_ArgumentPusherVaArg ap(methodID, args);
1214 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1215 return obj;
1216 JNI_END
1217
1218 DT_RETURN_MARK_DECL(NewObject, jobject);
1219
1220 JNI_ENTRY(jobject, jni_NewObject(JNIEnv *env, jclass clazz, jmethodID methodID, ...))
1221 JNIWrapper("NewObject");
1222 DTRACE_PROBE3(hotspot_jni, NewObject__entry, env, clazz, methodID);
1223 jobject obj = NULL;
1224 DT_RETURN_MARK(NewObject, jobject, (const jobject&)obj);
1225
1226 instanceOop i = alloc_object(clazz, CHECK_NULL);
1227 obj = JNIHandles::make_local(env, i);
1228 va_list args;
1229 va_start(args, methodID);
1230 JavaValue jvalue(T_VOID);
1231 JNI_ArgumentPusherVaArg ap(methodID, args);
1232 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_NULL);
1233 va_end(args);
1234 return obj;
1235 JNI_END
1236
1237
1238 JNI_ENTRY(jclass, jni_GetObjectClass(JNIEnv *env, jobject obj))
1239 JNIWrapper("GetObjectClass");
1240 DTRACE_PROBE2(hotspot_jni, GetObjectClass__entry, env, obj);
1241 klassOop k = JNIHandles::resolve_non_null(obj)->klass();
1242 jclass ret =
1243 (jclass) JNIHandles::make_local(env, Klass::cast(k)->java_mirror());
1244 DTRACE_PROBE1(hotspot_jni, GetObjectClass__return, ret);
1245 return ret;
1246 JNI_END
1247
1248 JNI_QUICK_ENTRY(jboolean, jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz))
1249 JNIWrapper("IsInstanceOf");
1250 DTRACE_PROBE3(hotspot_jni, IsInstanceOf__entry, env, obj, clazz);
1251 jboolean ret = JNI_TRUE;
1252 if (obj != NULL) {
1253 ret = JNI_FALSE;
1254 klassOop k = java_lang_Class::as_klassOop(
1255 JNIHandles::resolve_non_null(clazz));
1256 if (k != NULL) {
1257 ret = JNIHandles::resolve_non_null(obj)->is_a(k) ? JNI_TRUE : JNI_FALSE;
1258 }
1259 }
1260 DTRACE_PROBE1(hotspot_jni, IsInstanceOf__return, ret);
1261 return ret;
1262 JNI_END
1263
1264
1265 static jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name_str,
1266 const char *sig, bool is_static, TRAPS) {
1267 // %%%% This code should probably just call into a method in the LinkResolver
1268 //
1269 // The class should have been loaded (we have an instance of the class
1270 // passed in) so the method and signature should already be in the symbol
1271 // table. If they're not there, the method doesn't exist.
1272 const char *name_to_probe = (name_str == NULL)
1273 ? vmSymbols::object_initializer_name()->as_C_string()
1274 : name_str;
1275 TempNewSymbol name = SymbolTable::probe(name_to_probe, (int)strlen(name_to_probe));
1276 TempNewSymbol signature = SymbolTable::probe(sig, (int)strlen(sig));
1277
1278 if (name == NULL || signature == NULL) {
1279 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1280 }
1281
1282 // Throw a NoSuchMethodError exception if we have an instance of a
1283 // primitive java.lang.Class
1284 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(clazz))) {
1285 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1286 }
1287
1288 KlassHandle klass(THREAD,
1289 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1290
1291 // Make sure class is linked and initialized before handing id's out to
1292 // methodOops.
1293 Klass::cast(klass())->initialize(CHECK_NULL);
1294
1295 methodOop m;
1296 if (name == vmSymbols::object_initializer_name() ||
1297 name == vmSymbols::class_initializer_name()) {
1298 // Never search superclasses for constructors
1299 if (klass->oop_is_instance()) {
1300 m = instanceKlass::cast(klass())->find_method(name, signature);
1301 } else {
1302 m = NULL;
1303 }
1304 } else {
1305 m = klass->lookup_method(name, signature);
1306 // Look up interfaces
1307 if (m == NULL && klass->oop_is_instance()) {
1308 m = instanceKlass::cast(klass())->lookup_method_in_all_interfaces(name,
1309 signature);
1310 }
1311 }
1312 if (m == NULL || (m->is_static() != is_static)) {
1313 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), name_str);
1314 }
1315 return m->jmethod_id();
1316 }
1317
1318
1319 JNI_ENTRY(jmethodID, jni_GetMethodID(JNIEnv *env, jclass clazz,
1320 const char *name, const char *sig))
1321 JNIWrapper("GetMethodID");
1322 DTRACE_PROBE4(hotspot_jni, GetMethodID__entry, env, clazz, name, sig);
1323 jmethodID ret = get_method_id(env, clazz, name, sig, false, thread);
1324 DTRACE_PROBE1(hotspot_jni, GetMethodID__return, ret);
1325 return ret;
1326 JNI_END
1327
1328
1329 JNI_ENTRY(jmethodID, jni_GetStaticMethodID(JNIEnv *env, jclass clazz,
1330 const char *name, const char *sig))
1331 JNIWrapper("GetStaticMethodID");
1332 DTRACE_PROBE4(hotspot_jni, GetStaticMethodID__entry, env, clazz, name, sig);
1333 jmethodID ret = get_method_id(env, clazz, name, sig, true, thread);
1334 DTRACE_PROBE1(hotspot_jni, GetStaticMethodID__return, ret);
1335 return ret;
1336 JNI_END
1337
1338
1339
1340 //
1341 // Calling Methods
1342 //
1343
1344
1345 #define DEFINE_CALLMETHOD(ResultType, Result, Tag) \
1346 \
1347 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##Method, ResultType);\
1348 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodV, ResultType);\
1349 DT_RETURN_MARK_DECL_FOR(Result, Call##Result##MethodA, ResultType);\
1350 \
1351 JNI_ENTRY(ResultType, \
1352 jni_Call##Result##Method(JNIEnv *env, jobject obj, jmethodID methodID, ...)) \
1353 JNIWrapper("Call" XSTR(Result) "Method"); \
1354 \
1355 DTRACE_PROBE3(hotspot_jni, Call##Result##Method__entry, env, obj, methodID);\
1356 ResultType ret = 0;\
1357 DT_RETURN_MARK_FOR(Result, Call##Result##Method, ResultType, \
1358 (const ResultType&)ret);\
1359 \
1360 va_list args; \
1361 va_start(args, methodID); \
1362 JavaValue jvalue(Tag); \
1363 JNI_ArgumentPusherVaArg ap(methodID, args); \
1364 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1365 va_end(args); \
1366 ret = jvalue.get_##ResultType(); \
1367 return ret;\
1368 JNI_END \
1369 \
1370 \
1371 JNI_ENTRY(ResultType, \
1372 jni_Call##Result##MethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args)) \
1373 JNIWrapper("Call" XSTR(Result) "MethodV"); \
1374 \
1375 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodV__entry, env, obj, methodID);\
1376 ResultType ret = 0;\
1377 DT_RETURN_MARK_FOR(Result, Call##Result##MethodV, ResultType, \
1378 (const ResultType&)ret);\
1379 \
1380 JavaValue jvalue(Tag); \
1381 JNI_ArgumentPusherVaArg ap(methodID, args); \
1382 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1383 ret = jvalue.get_##ResultType(); \
1384 return ret;\
1385 JNI_END \
1386 \
1387 \
1388 JNI_ENTRY(ResultType, \
1389 jni_Call##Result##MethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args)) \
1390 JNIWrapper("Call" XSTR(Result) "MethodA"); \
1391 DTRACE_PROBE3(hotspot_jni, Call##Result##MethodA__entry, env, obj, methodID);\
1392 ResultType ret = 0;\
1393 DT_RETURN_MARK_FOR(Result, Call##Result##MethodA, ResultType, \
1394 (const ResultType&)ret);\
1395 \
1396 JavaValue jvalue(Tag); \
1397 JNI_ArgumentPusherArray ap(methodID, args); \
1398 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK_0); \
1399 ret = jvalue.get_##ResultType(); \
1400 return ret;\
1401 JNI_END
1402
1403 // the runtime type of subword integral basic types is integer
1404 DEFINE_CALLMETHOD(jboolean, Boolean, T_BOOLEAN)
1405 DEFINE_CALLMETHOD(jbyte, Byte, T_BYTE)
1406 DEFINE_CALLMETHOD(jchar, Char, T_CHAR)
1407 DEFINE_CALLMETHOD(jshort, Short, T_SHORT)
1408
1409 DEFINE_CALLMETHOD(jobject, Object, T_OBJECT)
1410 DEFINE_CALLMETHOD(jint, Int, T_INT)
1411 DEFINE_CALLMETHOD(jlong, Long, T_LONG)
1412 DEFINE_CALLMETHOD(jfloat, Float, T_FLOAT)
1413 DEFINE_CALLMETHOD(jdouble, Double, T_DOUBLE)
1414
1415 DT_VOID_RETURN_MARK_DECL(CallVoidMethod);
1416 DT_VOID_RETURN_MARK_DECL(CallVoidMethodV);
1417 DT_VOID_RETURN_MARK_DECL(CallVoidMethodA);
1418
1419 JNI_ENTRY(void, jni_CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID, ...))
1420 JNIWrapper("CallVoidMethod");
1421 DTRACE_PROBE3(hotspot_jni, CallVoidMethod__entry, env, obj, methodID);
1422 DT_VOID_RETURN_MARK(CallVoidMethod);
1423
1424 va_list args;
1425 va_start(args, methodID);
1426 JavaValue jvalue(T_VOID);
1427 JNI_ArgumentPusherVaArg ap(methodID, args);
1428 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1429 va_end(args);
1430 JNI_END
1431
1432
1433 JNI_ENTRY(void, jni_CallVoidMethodV(JNIEnv *env, jobject obj, jmethodID methodID, va_list args))
1434 JNIWrapper("CallVoidMethodV");
1435 DTRACE_PROBE3(hotspot_jni, CallVoidMethodV__entry, env, obj, methodID);
1436 DT_VOID_RETURN_MARK(CallVoidMethodV);
1437
1438 JavaValue jvalue(T_VOID);
1439 JNI_ArgumentPusherVaArg ap(methodID, args);
1440 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1441 JNI_END
1442
1443
1444 JNI_ENTRY(void, jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID methodID, const jvalue *args))
1445 JNIWrapper("CallVoidMethodA");
1446 DTRACE_PROBE3(hotspot_jni, CallVoidMethodA__entry, env, obj, methodID);
1447 DT_VOID_RETURN_MARK(CallVoidMethodA);
1448
1449 JavaValue jvalue(T_VOID);
1450 JNI_ArgumentPusherArray ap(methodID, args);
1451 jni_invoke_nonstatic(env, &jvalue, obj, JNI_VIRTUAL, methodID, &ap, CHECK);
1452 JNI_END
1453
1454
1455 #define DEFINE_CALLNONVIRTUALMETHOD(ResultType, Result, Tag) \
1456 \
1457 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##Method, ResultType);\
1458 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodV, ResultType);\
1459 DT_RETURN_MARK_DECL_FOR(Result, CallNonvirtual##Result##MethodA, ResultType);\
1460 \
1461 JNI_ENTRY(ResultType, \
1462 jni_CallNonvirtual##Result##Method(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...)) \
1463 JNIWrapper("CallNonvitual" XSTR(Result) "Method"); \
1464 \
1465 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##Method__entry, env, obj, cls, methodID);\
1466 ResultType ret;\
1467 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##Method, ResultType, \
1468 (const ResultType&)ret);\
1469 \
1470 va_list args; \
1471 va_start(args, methodID); \
1472 JavaValue jvalue(Tag); \
1473 JNI_ArgumentPusherVaArg ap(methodID, args); \
1474 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1475 va_end(args); \
1476 ret = jvalue.get_##ResultType(); \
1477 return ret;\
1478 JNI_END \
1479 \
1480 JNI_ENTRY(ResultType, \
1481 jni_CallNonvirtual##Result##MethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args)) \
1482 JNIWrapper("CallNonvitual" XSTR(Result) "#MethodV"); \
1483 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodV__entry, env, obj, cls, methodID);\
1484 ResultType ret;\
1485 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodV, ResultType, \
1486 (const ResultType&)ret);\
1487 \
1488 JavaValue jvalue(Tag); \
1489 JNI_ArgumentPusherVaArg ap(methodID, args); \
1490 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1491 ret = jvalue.get_##ResultType(); \
1492 return ret;\
1493 JNI_END \
1494 \
1495 JNI_ENTRY(ResultType, \
1496 jni_CallNonvirtual##Result##MethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args)) \
1497 JNIWrapper("CallNonvitual" XSTR(Result) "MethodA"); \
1498 DTRACE_PROBE4(hotspot_jni, CallNonvirtual##Result##MethodA__entry, env, obj, cls, methodID);\
1499 ResultType ret;\
1500 DT_RETURN_MARK_FOR(Result, CallNonvirtual##Result##MethodA, ResultType, \
1501 (const ResultType&)ret);\
1502 \
1503 JavaValue jvalue(Tag); \
1504 JNI_ArgumentPusherArray ap(methodID, args); \
1505 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK_0); \
1506 ret = jvalue.get_##ResultType(); \
1507 return ret;\
1508 JNI_END
1509
1510 // the runtime type of subword integral basic types is integer
1511 DEFINE_CALLNONVIRTUALMETHOD(jboolean, Boolean, T_BOOLEAN)
1512 DEFINE_CALLNONVIRTUALMETHOD(jbyte, Byte, T_BYTE)
1513 DEFINE_CALLNONVIRTUALMETHOD(jchar, Char, T_CHAR)
1514 DEFINE_CALLNONVIRTUALMETHOD(jshort, Short, T_SHORT)
1515
1516 DEFINE_CALLNONVIRTUALMETHOD(jobject, Object, T_OBJECT)
1517 DEFINE_CALLNONVIRTUALMETHOD(jint, Int, T_INT)
1518 DEFINE_CALLNONVIRTUALMETHOD(jlong, Long, T_LONG)
1519 DEFINE_CALLNONVIRTUALMETHOD(jfloat, Float, T_FLOAT)
1520 DEFINE_CALLNONVIRTUALMETHOD(jdouble, Double, T_DOUBLE)
1521
1522
1523 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethod);
1524 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodV);
1525 DT_VOID_RETURN_MARK_DECL(CallNonvirtualVoidMethodA);
1526
1527 JNI_ENTRY(void, jni_CallNonvirtualVoidMethod(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, ...))
1528 JNIWrapper("CallNonvirtualVoidMethod");
1529
1530 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethod__entry,
1531 env, obj, cls, methodID);
1532 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethod);
1533
1534 va_list args;
1535 va_start(args, methodID);
1536 JavaValue jvalue(T_VOID);
1537 JNI_ArgumentPusherVaArg ap(methodID, args);
1538 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1539 va_end(args);
1540 JNI_END
1541
1542
1543 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodV(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, va_list args))
1544 JNIWrapper("CallNonvirtualVoidMethodV");
1545
1546 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodV__entry,
1547 env, obj, cls, methodID);
1548 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodV);
1549
1550 JavaValue jvalue(T_VOID);
1551 JNI_ArgumentPusherVaArg ap(methodID, args);
1552 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1553 JNI_END
1554
1555
1556 JNI_ENTRY(void, jni_CallNonvirtualVoidMethodA(JNIEnv *env, jobject obj, jclass cls, jmethodID methodID, const jvalue *args))
1557 JNIWrapper("CallNonvirtualVoidMethodA");
1558 DTRACE_PROBE4(hotspot_jni, CallNonvirtualVoidMethodA__entry,
1559 env, obj, cls, methodID);
1560 DT_VOID_RETURN_MARK(CallNonvirtualVoidMethodA);
1561 JavaValue jvalue(T_VOID);
1562 JNI_ArgumentPusherArray ap(methodID, args);
1563 jni_invoke_nonstatic(env, &jvalue, obj, JNI_NONVIRTUAL, methodID, &ap, CHECK);
1564 JNI_END
1565
1566
1567 #define DEFINE_CALLSTATICMETHOD(ResultType, Result, Tag) \
1568 \
1569 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##Method, ResultType);\
1570 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodV, ResultType);\
1571 DT_RETURN_MARK_DECL_FOR(Result, CallStatic##Result##MethodA, ResultType);\
1572 \
1573 JNI_ENTRY(ResultType, \
1574 jni_CallStatic##Result##Method(JNIEnv *env, jclass cls, jmethodID methodID, ...)) \
1575 JNIWrapper("CallStatic" XSTR(Result) "Method"); \
1576 \
1577 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##Method__entry, env, cls, methodID);\
1578 ResultType ret = 0;\
1579 DT_RETURN_MARK_FOR(Result, CallStatic##Result##Method, ResultType, \
1580 (const ResultType&)ret);\
1581 \
1582 va_list args; \
1583 va_start(args, methodID); \
1584 JavaValue jvalue(Tag); \
1585 JNI_ArgumentPusherVaArg ap(methodID, args); \
1586 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1587 va_end(args); \
1588 ret = jvalue.get_##ResultType(); \
1589 return ret;\
1590 JNI_END \
1591 \
1592 JNI_ENTRY(ResultType, \
1593 jni_CallStatic##Result##MethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args)) \
1594 JNIWrapper("CallStatic" XSTR(Result) "MethodV"); \
1595 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodV__entry, env, cls, methodID);\
1596 ResultType ret = 0;\
1597 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodV, ResultType, \
1598 (const ResultType&)ret);\
1599 \
1600 JavaValue jvalue(Tag); \
1601 JNI_ArgumentPusherVaArg ap(methodID, args); \
1602 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1603 ret = jvalue.get_##ResultType(); \
1604 return ret;\
1605 JNI_END \
1606 \
1607 JNI_ENTRY(ResultType, \
1608 jni_CallStatic##Result##MethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args)) \
1609 JNIWrapper("CallStatic" XSTR(Result) "MethodA"); \
1610 DTRACE_PROBE3(hotspot_jni, CallStatic##Result##MethodA__entry, env, cls, methodID);\
1611 ResultType ret = 0;\
1612 DT_RETURN_MARK_FOR(Result, CallStatic##Result##MethodA, ResultType, \
1613 (const ResultType&)ret);\
1614 \
1615 JavaValue jvalue(Tag); \
1616 JNI_ArgumentPusherArray ap(methodID, args); \
1617 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK_0); \
1618 ret = jvalue.get_##ResultType(); \
1619 return ret;\
1620 JNI_END
1621
1622 // the runtime type of subword integral basic types is integer
1623 DEFINE_CALLSTATICMETHOD(jboolean, Boolean, T_BOOLEAN)
1624 DEFINE_CALLSTATICMETHOD(jbyte, Byte, T_BYTE)
1625 DEFINE_CALLSTATICMETHOD(jchar, Char, T_CHAR)
1626 DEFINE_CALLSTATICMETHOD(jshort, Short, T_SHORT)
1627
1628 DEFINE_CALLSTATICMETHOD(jobject, Object, T_OBJECT)
1629 DEFINE_CALLSTATICMETHOD(jint, Int, T_INT)
1630 DEFINE_CALLSTATICMETHOD(jlong, Long, T_LONG)
1631 DEFINE_CALLSTATICMETHOD(jfloat, Float, T_FLOAT)
1632 DEFINE_CALLSTATICMETHOD(jdouble, Double, T_DOUBLE)
1633
1634
1635 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethod);
1636 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodV);
1637 DT_VOID_RETURN_MARK_DECL(CallStaticVoidMethodA);
1638
1639 JNI_ENTRY(void, jni_CallStaticVoidMethod(JNIEnv *env, jclass cls, jmethodID methodID, ...))
1640 JNIWrapper("CallStaticVoidMethod");
1641 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethod__entry, env, cls, methodID);
1642 DT_VOID_RETURN_MARK(CallStaticVoidMethod);
1643
1644 va_list args;
1645 va_start(args, methodID);
1646 JavaValue jvalue(T_VOID);
1647 JNI_ArgumentPusherVaArg ap(methodID, args);
1648 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1649 va_end(args);
1650 JNI_END
1651
1652
1653 JNI_ENTRY(void, jni_CallStaticVoidMethodV(JNIEnv *env, jclass cls, jmethodID methodID, va_list args))
1654 JNIWrapper("CallStaticVoidMethodV");
1655 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodV__entry, env, cls, methodID);
1656 DT_VOID_RETURN_MARK(CallStaticVoidMethodV);
1657
1658 JavaValue jvalue(T_VOID);
1659 JNI_ArgumentPusherVaArg ap(methodID, args);
1660 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1661 JNI_END
1662
1663
1664 JNI_ENTRY(void, jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID methodID, const jvalue *args))
1665 JNIWrapper("CallStaticVoidMethodA");
1666 DTRACE_PROBE3(hotspot_jni, CallStaticVoidMethodA__entry, env, cls, methodID);
1667 DT_VOID_RETURN_MARK(CallStaticVoidMethodA);
1668
1669 JavaValue jvalue(T_VOID);
1670 JNI_ArgumentPusherArray ap(methodID, args);
1671 jni_invoke_static(env, &jvalue, NULL, JNI_STATIC, methodID, &ap, CHECK);
1672 JNI_END
1673
1674
1675 //
1676 // Accessing Fields
1677 //
1678
1679
1680 DT_RETURN_MARK_DECL(GetFieldID, jfieldID);
1681
1682 JNI_ENTRY(jfieldID, jni_GetFieldID(JNIEnv *env, jclass clazz,
1683 const char *name, const char *sig))
1684 JNIWrapper("GetFieldID");
1685 DTRACE_PROBE4(hotspot_jni, GetFieldID__entry, env, clazz, name, sig);
1686 jfieldID ret = 0;
1687 DT_RETURN_MARK(GetFieldID, jfieldID, (const jfieldID&)ret);
1688
1689 // The class should have been loaded (we have an instance of the class
1690 // passed in) so the field and signature should already be in the symbol
1691 // table. If they're not there, the field doesn't exist.
1692 TempNewSymbol fieldname = SymbolTable::probe(name, (int)strlen(name));
1693 TempNewSymbol signame = SymbolTable::probe(sig, (int)strlen(sig));
1694 if (fieldname == NULL || signame == NULL) {
1695 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1696 }
1697 KlassHandle k(THREAD,
1698 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1699 // Make sure class is initialized before handing id's out to fields
1700 Klass::cast(k())->initialize(CHECK_NULL);
1701
1702 fieldDescriptor fd;
1703 if (!Klass::cast(k())->oop_is_instance() ||
1704 !instanceKlass::cast(k())->find_field(fieldname, signame, false, &fd)) {
1705 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1706 }
1707
1708 // A jfieldID for a non-static field is simply the offset of the field within the instanceOop
1709 // It may also have hash bits for k, if VerifyJNIFields is turned on.
1710 ret = jfieldIDWorkaround::to_instance_jfieldID(k(), fd.offset());
1711 return ret;
1712 JNI_END
1713
1714
1715 JNI_ENTRY(jobject, jni_GetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID))
1716 JNIWrapper("GetObjectField");
1717 DTRACE_PROBE3(hotspot_jni, GetObjectField__entry, env, obj, fieldID);
1718 oop o = JNIHandles::resolve_non_null(obj);
1719 klassOop k = o->klass();
1720 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1721 // Keep JVMTI addition small and only check enabled flag here.
1722 // jni_GetField_probe() assumes that is okay to create handles.
1723 if (JvmtiExport::should_post_field_access()) {
1724 o = JvmtiExport::jni_GetField_probe(thread, obj, o, k, fieldID, false);
1725 }
1726 jobject ret = JNIHandles::make_local(env, o->obj_field(offset));
1727 DTRACE_PROBE1(hotspot_jni, GetObjectField__return, ret);
1728 return ret;
1729 JNI_END
1730
1731
1732 #define DEFINE_GETFIELD(Return,Fieldname,Result) \
1733 \
1734 DT_RETURN_MARK_DECL_FOR(Result, Get##Result##Field, Return);\
1735 \
1736 JNI_QUICK_ENTRY(Return, jni_Get##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID)) \
1737 JNIWrapper("Get" XSTR(Result) "Field"); \
1738 \
1739 DTRACE_PROBE3(hotspot_jni, Get##Result##Field__entry, env, obj, fieldID);\
1740 Return ret = 0;\
1741 DT_RETURN_MARK_FOR(Result, Get##Result##Field, Return, (const Return&)ret);\
1742 \
1743 oop o = JNIHandles::resolve_non_null(obj); \
1744 klassOop k = o->klass(); \
1745 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1746 /* Keep JVMTI addition small and only check enabled flag here. */ \
1747 /* jni_GetField_probe_nh() assumes that is not okay to create handles */ \
1748 /* and creates a ResetNoHandleMark. */ \
1749 if (JvmtiExport::should_post_field_access()) { \
1750 o = JvmtiExport::jni_GetField_probe_nh(thread, obj, o, k, fieldID, false); \
1751 } \
1752 ret = o->Fieldname##_field(offset); \
1753 return ret; \
1754 JNI_END
1755
1756 DEFINE_GETFIELD(jboolean, bool, Boolean)
1757 DEFINE_GETFIELD(jbyte, byte, Byte)
1758 DEFINE_GETFIELD(jchar, char, Char)
1759 DEFINE_GETFIELD(jshort, short, Short)
1760 DEFINE_GETFIELD(jint, int, Int)
1761 DEFINE_GETFIELD(jlong, long, Long)
1762 DEFINE_GETFIELD(jfloat, float, Float)
1763 DEFINE_GETFIELD(jdouble, double, Double)
1764
1765 address jni_GetBooleanField_addr() {
1766 return (address)jni_GetBooleanField;
1767 }
1768 address jni_GetByteField_addr() {
1769 return (address)jni_GetByteField;
1770 }
1771 address jni_GetCharField_addr() {
1772 return (address)jni_GetCharField;
1773 }
1774 address jni_GetShortField_addr() {
1775 return (address)jni_GetShortField;
1776 }
1777 address jni_GetIntField_addr() {
1778 return (address)jni_GetIntField;
1779 }
1780 address jni_GetLongField_addr() {
1781 return (address)jni_GetLongField;
1782 }
1783 address jni_GetFloatField_addr() {
1784 return (address)jni_GetFloatField;
1785 }
1786 address jni_GetDoubleField_addr() {
1787 return (address)jni_GetDoubleField;
1788 }
1789
1790 JNI_QUICK_ENTRY(void, jni_SetObjectField(JNIEnv *env, jobject obj, jfieldID fieldID, jobject value))
1791 JNIWrapper("SetObjectField");
1792 DTRACE_PROBE4(hotspot_jni, SetObjectField__entry, env, obj, fieldID, value);
1793 oop o = JNIHandles::resolve_non_null(obj);
1794 klassOop k = o->klass();
1795 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1796 // Keep JVMTI addition small and only check enabled flag here.
1797 // jni_SetField_probe_nh() assumes that is not okay to create handles
1798 // and creates a ResetNoHandleMark.
1799 if (JvmtiExport::should_post_field_modification()) {
1800 jvalue field_value;
1801 field_value.l = value;
1802 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, 'L', (jvalue *)&field_value);
1803 }
1804 o->obj_field_put(offset, JNIHandles::resolve(value));
1805 DTRACE_PROBE(hotspot_jni, SetObjectField__return);
1806 JNI_END
1807
1808 #define DEFINE_SETFIELD(Argument,Fieldname,Result,SigType,unionType) \
1809 \
1810 JNI_QUICK_ENTRY(void, jni_Set##Result##Field(JNIEnv *env, jobject obj, jfieldID fieldID, Argument value)) \
1811 JNIWrapper("Set" XSTR(Result) "Field"); \
1812 \
1813 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, Set##Result##Field__entry, \
1814 ( JNIEnv*, jobject, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1815 HS_DTRACE_PROBE_N(hotspot_jni, Set##Result##Field__entry, \
1816 ( env, obj, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1817 \
1818 oop o = JNIHandles::resolve_non_null(obj); \
1819 klassOop k = o->klass(); \
1820 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID); \
1821 /* Keep JVMTI addition small and only check enabled flag here. */ \
1822 /* jni_SetField_probe_nh() assumes that is not okay to create handles */ \
1823 /* and creates a ResetNoHandleMark. */ \
1824 if (JvmtiExport::should_post_field_modification()) { \
1825 jvalue field_value; \
1826 field_value.unionType = value; \
1827 o = JvmtiExport::jni_SetField_probe_nh(thread, obj, o, k, fieldID, false, SigType, (jvalue *)&field_value); \
1828 } \
1829 o->Fieldname##_field_put(offset, value); \
1830 DTRACE_PROBE(hotspot_jni, Set##Result##Field__return);\
1831 JNI_END
1832
1833 DEFINE_SETFIELD(jboolean, bool, Boolean, 'Z', z)
1834 DEFINE_SETFIELD(jbyte, byte, Byte, 'B', b)
1835 DEFINE_SETFIELD(jchar, char, Char, 'C', c)
1836 DEFINE_SETFIELD(jshort, short, Short, 'S', s)
1837 DEFINE_SETFIELD(jint, int, Int, 'I', i)
1838 DEFINE_SETFIELD(jlong, long, Long, 'J', j)
1839 DEFINE_SETFIELD(jfloat, float, Float, 'F', f)
1840 DEFINE_SETFIELD(jdouble, double, Double, 'D', d)
1841
1842 DT_RETURN_MARK_DECL(ToReflectedField, jobject);
1843
1844 JNI_ENTRY(jobject, jni_ToReflectedField(JNIEnv *env, jclass cls, jfieldID fieldID, jboolean isStatic))
1845 JNIWrapper("ToReflectedField");
1846 DTRACE_PROBE4(hotspot_jni, ToReflectedField__entry,
1847 env, cls, fieldID, isStatic);
1848 jobject ret = NULL;
1849 DT_RETURN_MARK(ToReflectedField, jobject, (const jobject&)ret);
1850
1851 fieldDescriptor fd;
1852 bool found = false;
1853 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(cls));
1854
1855 assert(jfieldIDWorkaround::is_static_jfieldID(fieldID) == (isStatic != 0), "invalid fieldID");
1856
1857 if (isStatic) {
1858 // Static field. The fieldID a JNIid specifying the field holder and the offset within the klassOop.
1859 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1860 assert(id->is_static_field_id(), "invalid static field id");
1861 found = id->find_local_field(&fd);
1862 } else {
1863 // Non-static field. The fieldID is really the offset of the field within the instanceOop.
1864 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, fieldID);
1865 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, &fd);
1866 }
1867 assert(found, "bad fieldID passed into jni_ToReflectedField");
1868 oop reflected = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
1869 ret = JNIHandles::make_local(env, reflected);
1870 return ret;
1871 JNI_END
1872
1873
1874 //
1875 // Accessing Static Fields
1876 //
1877 DT_RETURN_MARK_DECL(GetStaticFieldID, jfieldID);
1878
1879 JNI_ENTRY(jfieldID, jni_GetStaticFieldID(JNIEnv *env, jclass clazz,
1880 const char *name, const char *sig))
1881 JNIWrapper("GetStaticFieldID");
1882 DTRACE_PROBE4(hotspot_jni, GetStaticFieldID__entry, env, clazz, name, sig);
1883 jfieldID ret = NULL;
1884 DT_RETURN_MARK(GetStaticFieldID, jfieldID, (const jfieldID&)ret);
1885
1886 // The class should have been loaded (we have an instance of the class
1887 // passed in) so the field and signature should already be in the symbol
1888 // table. If they're not there, the field doesn't exist.
1889 TempNewSymbol fieldname = SymbolTable::probe(name, (int)strlen(name));
1890 TempNewSymbol signame = SymbolTable::probe(sig, (int)strlen(sig));
1891 if (fieldname == NULL || signame == NULL) {
1892 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1893 }
1894 KlassHandle k(THREAD,
1895 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
1896 // Make sure class is initialized before handing id's out to static fields
1897 Klass::cast(k())->initialize(CHECK_NULL);
1898
1899 fieldDescriptor fd;
1900 if (!Klass::cast(k())->oop_is_instance() ||
1901 !instanceKlass::cast(k())->find_field(fieldname, signame, true, &fd)) {
1902 THROW_MSG_0(vmSymbols::java_lang_NoSuchFieldError(), (char*) name);
1903 }
1904
1905 // A jfieldID for a static field is a JNIid specifying the field holder and the offset within the klassOop
1906 JNIid* id = instanceKlass::cast(fd.field_holder())->jni_id_for(fd.offset());
1907 debug_only(id->set_is_static_field_id();)
1908
1909 debug_only(id->verify(fd.field_holder()));
1910
1911 ret = jfieldIDWorkaround::to_static_jfieldID(id);
1912 return ret;
1913 JNI_END
1914
1915
1916 JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID))
1917 JNIWrapper("GetStaticObjectField");
1918 DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID);
1919 #ifndef JNICHECK_KERNEL
1920 DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);)
1921 #endif // JNICHECK_KERNEL
1922 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1923 assert(id->is_static_field_id(), "invalid static field id");
1924 // Keep JVMTI addition small and only check enabled flag here.
1925 // jni_GetField_probe() assumes that is okay to create handles.
1926 if (JvmtiExport::should_post_field_access()) {
1927 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true);
1928 }
1929 jobject ret = JNIHandles::make_local(id->holder()->java_mirror()->obj_field(id->offset()));
1930 DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret);
1931 return ret;
1932 JNI_END
1933
1934 #define DEFINE_GETSTATICFIELD(Return,Fieldname,Result) \
1935 \
1936 DT_RETURN_MARK_DECL_FOR(Result, GetStatic##Result##Field, Return);\
1937 \
1938 JNI_ENTRY(Return, jni_GetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID)) \
1939 JNIWrapper("GetStatic" XSTR(Result) "Field"); \
1940 DTRACE_PROBE3(hotspot_jni, GetStatic##Result##Field__entry, env, clazz, fieldID);\
1941 Return ret = 0;\
1942 DT_RETURN_MARK_FOR(Result, GetStatic##Result##Field, Return, \
1943 (const Return&)ret);\
1944 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1945 assert(id->is_static_field_id(), "invalid static field id"); \
1946 /* Keep JVMTI addition small and only check enabled flag here. */ \
1947 /* jni_GetField_probe() assumes that is okay to create handles. */ \
1948 if (JvmtiExport::should_post_field_access()) { \
1949 JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true); \
1950 } \
1951 ret = id->holder()->java_mirror()-> Fieldname##_field (id->offset()); \
1952 return ret;\
1953 JNI_END
1954
1955 DEFINE_GETSTATICFIELD(jboolean, bool, Boolean)
1956 DEFINE_GETSTATICFIELD(jbyte, byte, Byte)
1957 DEFINE_GETSTATICFIELD(jchar, char, Char)
1958 DEFINE_GETSTATICFIELD(jshort, short, Short)
1959 DEFINE_GETSTATICFIELD(jint, int, Int)
1960 DEFINE_GETSTATICFIELD(jlong, long, Long)
1961 DEFINE_GETSTATICFIELD(jfloat, float, Float)
1962 DEFINE_GETSTATICFIELD(jdouble, double, Double)
1963
1964
1965 JNI_ENTRY(void, jni_SetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID, jobject value))
1966 JNIWrapper("SetStaticObjectField");
1967 DTRACE_PROBE4(hotspot_jni, SetStaticObjectField__entry, env, clazz, fieldID, value);
1968 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
1969 assert(id->is_static_field_id(), "invalid static field id");
1970 // Keep JVMTI addition small and only check enabled flag here.
1971 // jni_SetField_probe() assumes that is okay to create handles.
1972 if (JvmtiExport::should_post_field_modification()) {
1973 jvalue field_value;
1974 field_value.l = value;
1975 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, 'L', (jvalue *)&field_value);
1976 }
1977 id->holder()->java_mirror()->obj_field_put(id->offset(), JNIHandles::resolve(value));
1978 DTRACE_PROBE(hotspot_jni, SetStaticObjectField__return);
1979 JNI_END
1980
1981
1982 #define DEFINE_SETSTATICFIELD(Argument,Fieldname,Result,SigType,unionType) \
1983 \
1984 JNI_ENTRY(void, jni_SetStatic##Result##Field(JNIEnv *env, jclass clazz, jfieldID fieldID, Argument value)) \
1985 JNIWrapper("SetStatic" XSTR(Result) "Field"); \
1986 HS_DTRACE_PROBE_CDECL_N(hotspot_jni, SetStatic##Result##Field__entry,\
1987 ( JNIEnv*, jclass, jfieldID FP_SELECT_##Result(COMMA Argument,/*empty*/) ) ); \
1988 HS_DTRACE_PROBE_N(hotspot_jni, SetStatic##Result##Field__entry, \
1989 ( env, clazz, fieldID FP_SELECT_##Result(COMMA value,/*empty*/) ) ); \
1990 \
1991 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID); \
1992 assert(id->is_static_field_id(), "invalid static field id"); \
1993 /* Keep JVMTI addition small and only check enabled flag here. */ \
1994 /* jni_SetField_probe() assumes that is okay to create handles. */ \
1995 if (JvmtiExport::should_post_field_modification()) { \
1996 jvalue field_value; \
1997 field_value.unionType = value; \
1998 JvmtiExport::jni_SetField_probe(thread, NULL, NULL, id->holder(), fieldID, true, SigType, (jvalue *)&field_value); \
1999 } \
2000 id->holder()->java_mirror()-> Fieldname##_field_put (id->offset(), value); \
2001 DTRACE_PROBE(hotspot_jni, SetStatic##Result##Field__return);\
2002 JNI_END
2003
2004 DEFINE_SETSTATICFIELD(jboolean, bool, Boolean, 'Z', z)
2005 DEFINE_SETSTATICFIELD(jbyte, byte, Byte, 'B', b)
2006 DEFINE_SETSTATICFIELD(jchar, char, Char, 'C', c)
2007 DEFINE_SETSTATICFIELD(jshort, short, Short, 'S', s)
2008 DEFINE_SETSTATICFIELD(jint, int, Int, 'I', i)
2009 DEFINE_SETSTATICFIELD(jlong, long, Long, 'J', j)
2010 DEFINE_SETSTATICFIELD(jfloat, float, Float, 'F', f)
2011 DEFINE_SETSTATICFIELD(jdouble, double, Double, 'D', d)
2012
2013
2014 //
2015 // String Operations
2016 //
2017
2018 // Unicode Interface
2019
2020 DT_RETURN_MARK_DECL(NewString, jstring);
2021
2022 JNI_ENTRY(jstring, jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len))
2023 JNIWrapper("NewString");
2024 DTRACE_PROBE3(hotspot_jni, NewString__entry, env, unicodeChars, len);
2025 jstring ret = NULL;
2026 DT_RETURN_MARK(NewString, jstring, (const jstring&)ret);
2027 oop string=java_lang_String::create_oop_from_unicode((jchar*) unicodeChars, len, CHECK_NULL);
2028 ret = (jstring) JNIHandles::make_local(env, string);
2029 return ret;
2030 JNI_END
2031
2032
2033 JNI_QUICK_ENTRY(jsize, jni_GetStringLength(JNIEnv *env, jstring string))
2034 JNIWrapper("GetStringLength");
2035 DTRACE_PROBE2(hotspot_jni, GetStringLength__entry, env, string);
2036 jsize ret = java_lang_String::length(JNIHandles::resolve_non_null(string));
2037 DTRACE_PROBE1(hotspot_jni, GetStringLength__return, ret);
2038 return ret;
2039 JNI_END
2040
2041
2042 JNI_QUICK_ENTRY(const jchar*, jni_GetStringChars(
2043 JNIEnv *env, jstring string, jboolean *isCopy))
2044 JNIWrapper("GetStringChars");
2045 DTRACE_PROBE3(hotspot_jni, GetStringChars__entry, env, string, isCopy);
2046 //%note jni_5
2047 if (isCopy != NULL) {
2048 *isCopy = JNI_TRUE;
2049 }
2050 oop s = JNIHandles::resolve_non_null(string);
2051 int s_len = java_lang_String::length(s);
2052 typeArrayOop s_value = java_lang_String::value(s);
2053 int s_offset = java_lang_String::offset(s);
2054 jchar* buf = NEW_C_HEAP_ARRAY(jchar, s_len + 1); // add one for zero termination
2055 if (s_len > 0) {
2056 memcpy(buf, s_value->char_at_addr(s_offset), sizeof(jchar)*s_len);
2057 }
2058 buf[s_len] = 0;
2059 DTRACE_PROBE1(hotspot_jni, GetStringChars__return, buf);
2060 return buf;
2061 JNI_END
2062
2063
2064 JNI_QUICK_ENTRY(void, jni_ReleaseStringChars(JNIEnv *env, jstring str, const jchar *chars))
2065 JNIWrapper("ReleaseStringChars");
2066 DTRACE_PROBE3(hotspot_jni, ReleaseStringChars__entry, env, str, chars);
2067 //%note jni_6
2068 if (chars != NULL) {
2069 // Since String objects are supposed to be immutable, don't copy any
2070 // new data back. A bad user will have to go after the char array.
2071 FreeHeap((void*) chars);
2072 }
2073 DTRACE_PROBE(hotspot_jni, ReleaseStringChars__return);
2074 JNI_END
2075
2076
2077 // UTF Interface
2078
2079 DT_RETURN_MARK_DECL(NewStringUTF, jstring);
2080
2081 JNI_ENTRY(jstring, jni_NewStringUTF(JNIEnv *env, const char *bytes))
2082 JNIWrapper("NewStringUTF");
2083 DTRACE_PROBE2(hotspot_jni, NewStringUTF__entry, env, bytes);
2084 jstring ret;
2085 DT_RETURN_MARK(NewStringUTF, jstring, (const jstring&)ret);
2086
2087 oop result = java_lang_String::create_oop_from_str((char*) bytes, CHECK_NULL);
2088 ret = (jstring) JNIHandles::make_local(env, result);
2089 return ret;
2090 JNI_END
2091
2092
2093 JNI_ENTRY(jsize, jni_GetStringUTFLength(JNIEnv *env, jstring string))
2094 JNIWrapper("GetStringUTFLength");
2095 DTRACE_PROBE2(hotspot_jni, GetStringUTFLength__entry, env, string);
2096 jsize ret = java_lang_String::utf8_length(JNIHandles::resolve_non_null(string));
2097 DTRACE_PROBE1(hotspot_jni, GetStringUTFLength__return, ret);
2098 return ret;
2099 JNI_END
2100
2101
2102 JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboolean *isCopy))
2103 JNIWrapper("GetStringUTFChars");
2104 DTRACE_PROBE3(hotspot_jni, GetStringUTFChars__entry, env, string, isCopy);
2105 oop java_string = JNIHandles::resolve_non_null(string);
2106 size_t length = java_lang_String::utf8_length(java_string);
2107 char* result = AllocateHeap(length + 1, "GetStringUTFChars");
2108 java_lang_String::as_utf8_string(java_string, result, (int) length + 1);
2109 if (isCopy != NULL) *isCopy = JNI_TRUE;
2110 DTRACE_PROBE1(hotspot_jni, GetStringUTFChars__return, result);
2111 return result;
2112 JNI_END
2113
2114
2115 JNI_LEAF(void, jni_ReleaseStringUTFChars(JNIEnv *env, jstring str, const char *chars))
2116 JNIWrapper("ReleaseStringUTFChars");
2117 DTRACE_PROBE3(hotspot_jni, ReleaseStringUTFChars__entry, env, str, chars);
2118 if (chars != NULL) {
2119 FreeHeap((char*) chars);
2120 }
2121 DTRACE_PROBE(hotspot_jni, ReleaseStringUTFChars__return);
2122 JNI_END
2123
2124
2125 JNI_QUICK_ENTRY(jsize, jni_GetArrayLength(JNIEnv *env, jarray array))
2126 JNIWrapper("GetArrayLength");
2127 DTRACE_PROBE2(hotspot_jni, GetArrayLength__entry, env, array);
2128 arrayOop a = arrayOop(JNIHandles::resolve_non_null(array));
2129 assert(a->is_array(), "must be array");
2130 jsize ret = a->length();
2131 DTRACE_PROBE1(hotspot_jni, GetArrayLength__return, ret);
2132 return ret;
2133 JNI_END
2134
2135
2136 //
2137 // Object Array Operations
2138 //
2139
2140 DT_RETURN_MARK_DECL(NewObjectArray, jobjectArray);
2141
2142 JNI_ENTRY(jobjectArray, jni_NewObjectArray(JNIEnv *env, jsize length, jclass elementClass, jobject initialElement))
2143 JNIWrapper("NewObjectArray");
2144 DTRACE_PROBE4(hotspot_jni, NewObjectArray__entry, env, length, elementClass, initialElement);
2145 jobjectArray ret = NULL;
2146 DT_RETURN_MARK(NewObjectArray, jobjectArray, (const jobjectArray&)ret);
2147 KlassHandle ek(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(elementClass)));
2148 klassOop ako = Klass::cast(ek())->array_klass(CHECK_NULL);
2149 KlassHandle ak = KlassHandle(THREAD, ako);
2150 objArrayKlass::cast(ak())->initialize(CHECK_NULL);
2151 objArrayOop result = objArrayKlass::cast(ak())->allocate(length, CHECK_NULL);
2152 oop initial_value = JNIHandles::resolve(initialElement);
2153 if (initial_value != NULL) { // array already initialized with NULL
2154 for (int index = 0; index < length; index++) {
2155 result->obj_at_put(index, initial_value);
2156 }
2157 }
2158 ret = (jobjectArray) JNIHandles::make_local(env, result);
2159 return ret;
2160 JNI_END
2161
2162 DT_RETURN_MARK_DECL(GetObjectArrayElement, jobject);
2163
2164 JNI_ENTRY(jobject, jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index))
2165 JNIWrapper("GetObjectArrayElement");
2166 DTRACE_PROBE3(hotspot_jni, GetObjectArrayElement__entry, env, array, index);
2167 jobject ret = NULL;
2168 DT_RETURN_MARK(GetObjectArrayElement, jobject, (const jobject&)ret);
2169 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2170 if (a->is_within_bounds(index)) {
2171 ret = JNIHandles::make_local(env, a->obj_at(index));
2172 return ret;
2173 } else {
2174 char buf[jintAsStringSize];
2175 sprintf(buf, "%d", index);
2176 THROW_MSG_0(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2177 }
2178 JNI_END
2179
2180 DT_VOID_RETURN_MARK_DECL(SetObjectArrayElement);
2181
2182 JNI_ENTRY(void, jni_SetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index, jobject value))
2183 JNIWrapper("SetObjectArrayElement");
2184 DTRACE_PROBE4(hotspot_jni, SetObjectArrayElement__entry, env, array, index, value);
2185 DT_VOID_RETURN_MARK(SetObjectArrayElement);
2186
2187 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(array));
2188 oop v = JNIHandles::resolve(value);
2189 if (a->is_within_bounds(index)) {
2190 if (v == NULL || v->is_a(objArrayKlass::cast(a->klass())->element_klass())) {
2191 a->obj_at_put(index, v);
2192 } else {
2193 THROW(vmSymbols::java_lang_ArrayStoreException());
2194 }
2195 } else {
2196 char buf[jintAsStringSize];
2197 sprintf(buf, "%d", index);
2198 THROW_MSG(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), buf);
2199 }
2200 JNI_END
2201
2202
2203 #define DEFINE_NEWSCALARARRAY(Return,Allocator,Result) \
2204 \
2205 DT_RETURN_MARK_DECL(New##Result##Array, Return);\
2206 \
2207 JNI_ENTRY(Return, \
2208 jni_New##Result##Array(JNIEnv *env, jsize len)) \
2209 JNIWrapper("New" XSTR(Result) "Array"); \
2210 DTRACE_PROBE2(hotspot_jni, New##Result##Array__entry, env, len);\
2211 Return ret = NULL;\
2212 DT_RETURN_MARK(New##Result##Array, Return, (const Return&)ret);\
2213 \
2214 oop obj= oopFactory::Allocator(len, CHECK_0); \
2215 ret = (Return) JNIHandles::make_local(env, obj); \
2216 return ret;\
2217 JNI_END
2218
2219 DEFINE_NEWSCALARARRAY(jbooleanArray, new_boolArray, Boolean)
2220 DEFINE_NEWSCALARARRAY(jbyteArray, new_byteArray, Byte)
2221 DEFINE_NEWSCALARARRAY(jshortArray, new_shortArray, Short)
2222 DEFINE_NEWSCALARARRAY(jcharArray, new_charArray, Char)
2223 DEFINE_NEWSCALARARRAY(jintArray, new_intArray, Int)
2224 DEFINE_NEWSCALARARRAY(jlongArray, new_longArray, Long)
2225 DEFINE_NEWSCALARARRAY(jfloatArray, new_singleArray, Float)
2226 DEFINE_NEWSCALARARRAY(jdoubleArray, new_doubleArray, Double)
2227
2228
2229 // Return an address which will fault if the caller writes to it.
2230
2231 static char* get_bad_address() {
2232 static char* bad_address = NULL;
2233 if (bad_address == NULL) {
2234 size_t size = os::vm_allocation_granularity();
2235 bad_address = os::reserve_memory(size);
2236 if (bad_address != NULL) {
2237 os::protect_memory(bad_address, size, os::MEM_PROT_READ,
2238 /*is_committed*/false);
2239 }
2240 }
2241 return bad_address;
2242 }
2243
2244
2245 #define DEFINE_GETSCALARARRAYELEMENTS(ElementTag,ElementType,Result, Tag) \
2246 \
2247 JNI_QUICK_ENTRY(ElementType*, \
2248 jni_Get##Result##ArrayElements(JNIEnv *env, ElementType##Array array, jboolean *isCopy)) \
2249 JNIWrapper("Get" XSTR(Result) "ArrayElements"); \
2250 DTRACE_PROBE3(hotspot_jni, Get##Result##ArrayElements__entry, env, array, isCopy);\
2251 /* allocate an chunk of memory in c land */ \
2252 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2253 ElementType* result; \
2254 int len = a->length(); \
2255 if (len == 0) { \
2256 /* Empty array: legal but useless, can't return NULL. \
2257 * Return a pointer to something useless. \
2258 * Avoid asserts in typeArrayOop. */ \
2259 result = (ElementType*)get_bad_address(); \
2260 } else { \
2261 result = NEW_C_HEAP_ARRAY(ElementType, len); \
2262 /* copy the array to the c chunk */ \
2263 memcpy(result, a->Tag##_at_addr(0), sizeof(ElementType)*len); \
2264 } \
2265 if (isCopy) *isCopy = JNI_TRUE; \
2266 DTRACE_PROBE1(hotspot_jni, Get##Result##ArrayElements__return, result);\
2267 return result; \
2268 JNI_END
2269
2270 DEFINE_GETSCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2271 DEFINE_GETSCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2272 DEFINE_GETSCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2273 DEFINE_GETSCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2274 DEFINE_GETSCALARARRAYELEMENTS(T_INT, jint, Int, int)
2275 DEFINE_GETSCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2276 DEFINE_GETSCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2277 DEFINE_GETSCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2278
2279
2280 #define DEFINE_RELEASESCALARARRAYELEMENTS(ElementTag,ElementType,Result,Tag) \
2281 \
2282 JNI_QUICK_ENTRY(void, \
2283 jni_Release##Result##ArrayElements(JNIEnv *env, ElementType##Array array, \
2284 ElementType *buf, jint mode)) \
2285 JNIWrapper("Release" XSTR(Result) "ArrayElements"); \
2286 DTRACE_PROBE4(hotspot_jni, Release##Result##ArrayElements__entry, env, array, buf, mode);\
2287 typeArrayOop a = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2288 int len = a->length(); \
2289 if (len != 0) { /* Empty array: nothing to free or copy. */ \
2290 if ((mode == 0) || (mode == JNI_COMMIT)) { \
2291 memcpy(a->Tag##_at_addr(0), buf, sizeof(ElementType)*len); \
2292 } \
2293 if ((mode == 0) || (mode == JNI_ABORT)) { \
2294 FreeHeap(buf); \
2295 } \
2296 } \
2297 DTRACE_PROBE(hotspot_jni, Release##Result##ArrayElements__return);\
2298 JNI_END
2299
2300 DEFINE_RELEASESCALARARRAYELEMENTS(T_BOOLEAN, jboolean, Boolean, bool)
2301 DEFINE_RELEASESCALARARRAYELEMENTS(T_BYTE, jbyte, Byte, byte)
2302 DEFINE_RELEASESCALARARRAYELEMENTS(T_SHORT, jshort, Short, short)
2303 DEFINE_RELEASESCALARARRAYELEMENTS(T_CHAR, jchar, Char, char)
2304 DEFINE_RELEASESCALARARRAYELEMENTS(T_INT, jint, Int, int)
2305 DEFINE_RELEASESCALARARRAYELEMENTS(T_LONG, jlong, Long, long)
2306 DEFINE_RELEASESCALARARRAYELEMENTS(T_FLOAT, jfloat, Float, float)
2307 DEFINE_RELEASESCALARARRAYELEMENTS(T_DOUBLE, jdouble, Double, double)
2308
2309 #define DEFINE_GETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2310 DT_VOID_RETURN_MARK_DECL(Get##Result##ArrayRegion);\
2311 \
2312 JNI_ENTRY(void, \
2313 jni_Get##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2314 jsize len, ElementType *buf)) \
2315 JNIWrapper("Get" XSTR(Result) "ArrayRegion"); \
2316 DTRACE_PROBE5(hotspot_jni, Get##Result##ArrayRegion__entry, env, array, start, len, buf);\
2317 DT_VOID_RETURN_MARK(Get##Result##ArrayRegion); \
2318 typeArrayOop src = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2319 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)src->length())) { \
2320 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2321 } else { \
2322 if (len > 0) { \
2323 int sc = typeArrayKlass::cast(src->klass())->log2_element_size(); \
2324 memcpy((u_char*) buf, \
2325 (u_char*) src->Tag##_at_addr(start), \
2326 len << sc); \
2327 } \
2328 } \
2329 JNI_END
2330
2331 DEFINE_GETSCALARARRAYREGION(T_BOOLEAN, jboolean,Boolean, bool)
2332 DEFINE_GETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2333 DEFINE_GETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2334 DEFINE_GETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2335 DEFINE_GETSCALARARRAYREGION(T_INT, jint, Int, int)
2336 DEFINE_GETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2337 DEFINE_GETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2338 DEFINE_GETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2339
2340 #define DEFINE_SETSCALARARRAYREGION(ElementTag,ElementType,Result, Tag) \
2341 DT_VOID_RETURN_MARK_DECL(Set##Result##ArrayRegion);\
2342 \
2343 JNI_ENTRY(void, \
2344 jni_Set##Result##ArrayRegion(JNIEnv *env, ElementType##Array array, jsize start, \
2345 jsize len, const ElementType *buf)) \
2346 JNIWrapper("Set" XSTR(Result) "ArrayRegion"); \
2347 DTRACE_PROBE5(hotspot_jni, Set##Result##ArrayRegion__entry, env, array, start, len, buf);\
2348 DT_VOID_RETURN_MARK(Set##Result##ArrayRegion); \
2349 typeArrayOop dst = typeArrayOop(JNIHandles::resolve_non_null(array)); \
2350 if (start < 0 || len < 0 || ((unsigned int)start + (unsigned int)len > (unsigned int)dst->length())) { \
2351 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); \
2352 } else { \
2353 if (len > 0) { \
2354 int sc = typeArrayKlass::cast(dst->klass())->log2_element_size(); \
2355 memcpy((u_char*) dst->Tag##_at_addr(start), \
2356 (u_char*) buf, \
2357 len << sc); \
2358 } \
2359 } \
2360 JNI_END
2361
2362 DEFINE_SETSCALARARRAYREGION(T_BOOLEAN, jboolean, Boolean, bool)
2363 DEFINE_SETSCALARARRAYREGION(T_BYTE, jbyte, Byte, byte)
2364 DEFINE_SETSCALARARRAYREGION(T_SHORT, jshort, Short, short)
2365 DEFINE_SETSCALARARRAYREGION(T_CHAR, jchar, Char, char)
2366 DEFINE_SETSCALARARRAYREGION(T_INT, jint, Int, int)
2367 DEFINE_SETSCALARARRAYREGION(T_LONG, jlong, Long, long)
2368 DEFINE_SETSCALARARRAYREGION(T_FLOAT, jfloat, Float, float)
2369 DEFINE_SETSCALARARRAYREGION(T_DOUBLE, jdouble, Double, double)
2370
2371
2372 //
2373 // Interception of natives
2374 //
2375
2376 // The RegisterNatives call being attempted tried to register with a method that
2377 // is not native. Ask JVM TI what prefixes have been specified. Then check
2378 // to see if the native method is now wrapped with the prefixes. See the
2379 // SetNativeMethodPrefix(es) functions in the JVM TI Spec for details.
2380 static methodOop find_prefixed_native(KlassHandle k,
2381 Symbol* name, Symbol* signature, TRAPS) {
2382 ResourceMark rm(THREAD);
2383 methodOop method;
2384 int name_len = name->utf8_length();
2385 char* name_str = name->as_utf8();
2386 int prefix_count;
2387 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
2388 for (int i = 0; i < prefix_count; i++) {
2389 char* prefix = prefixes[i];
2390 int prefix_len = (int)strlen(prefix);
2391
2392 // try adding this prefix to the method name and see if it matches another method name
2393 int trial_len = name_len + prefix_len;
2394 char* trial_name_str = NEW_RESOURCE_ARRAY(char, trial_len + 1);
2395 strcpy(trial_name_str, prefix);
2396 strcat(trial_name_str, name_str);
2397 TempNewSymbol trial_name = SymbolTable::probe(trial_name_str, trial_len);
2398 if (trial_name == NULL) {
2399 continue; // no such symbol, so this prefix wasn't used, try the next prefix
2400 }
2401 method = Klass::cast(k())->lookup_method(trial_name, signature);
2402 if (method == NULL) {
2403 continue; // signature doesn't match, try the next prefix
2404 }
2405 if (method->is_native()) {
2406 method->set_is_prefixed_native();
2407 return method; // wahoo, we found a prefixed version of the method, return it
2408 }
2409 // found as non-native, so prefix is good, add it, probably just need more prefixes
2410 name_len = trial_len;
2411 name_str = trial_name_str;
2412 }
2413 return NULL; // not found
2414 }
2415
2416 static bool register_native(KlassHandle k, Symbol* name, Symbol* signature, address entry, TRAPS) {
2417 methodOop method = Klass::cast(k())->lookup_method(name, signature);
2418 if (method == NULL) {
2419 ResourceMark rm;
2420 stringStream st;
2421 st.print("Method %s name or signature does not match",
2422 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name, signature));
2423 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2424 }
2425 if (!method->is_native()) {
2426 // trying to register to a non-native method, see if a JVM TI agent has added prefix(es)
2427 method = find_prefixed_native(k, name, signature, THREAD);
2428 if (method == NULL) {
2429 ResourceMark rm;
2430 stringStream st;
2431 st.print("Method %s is not declared as native",
2432 methodOopDesc::name_and_sig_as_C_string(Klass::cast(k()), name, signature));
2433 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), false);
2434 }
2435 }
2436
2437 if (entry != NULL) {
2438 method->set_native_function(entry,
2439 methodOopDesc::native_bind_event_is_interesting);
2440 } else {
2441 method->clear_native_function();
2442 }
2443 if (PrintJNIResolving) {
2444 ResourceMark rm(THREAD);
2445 tty->print_cr("[Registering JNI native method %s.%s]",
2446 Klass::cast(method->method_holder())->external_name(),
2447 method->name()->as_C_string());
2448 }
2449 return true;
2450 }
2451
2452 DT_RETURN_MARK_DECL(RegisterNatives, jint);
2453
2454 JNI_ENTRY(jint, jni_RegisterNatives(JNIEnv *env, jclass clazz,
2455 const JNINativeMethod *methods,
2456 jint nMethods))
2457 JNIWrapper("RegisterNatives");
2458 DTRACE_PROBE4(hotspot_jni, RegisterNatives__entry, env, clazz, methods, nMethods);
2459 jint ret = 0;
2460 DT_RETURN_MARK(RegisterNatives, jint, (const jint&)ret);
2461
2462 KlassHandle h_k(thread, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz)));
2463
2464 for (int index = 0; index < nMethods; index++) {
2465 const char* meth_name = methods[index].name;
2466 const char* meth_sig = methods[index].signature;
2467 int meth_name_len = (int)strlen(meth_name);
2468
2469 // The class should have been loaded (we have an instance of the class
2470 // passed in) so the method and signature should already be in the symbol
2471 // table. If they're not there, the method doesn't exist.
2472 TempNewSymbol name = SymbolTable::probe(meth_name, meth_name_len);
2473 TempNewSymbol signature = SymbolTable::probe(meth_sig, (int)strlen(meth_sig));
2474
2475 if (name == NULL || signature == NULL) {
2476 ResourceMark rm;
2477 stringStream st;
2478 st.print("Method %s.%s%s not found", Klass::cast(h_k())->external_name(), meth_name, meth_sig);
2479 // Must return negative value on failure
2480 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodError(), st.as_string(), -1);
2481 }
2482
2483 bool res = register_native(h_k, name, signature,
2484 (address) methods[index].fnPtr, THREAD);
2485 if (!res) {
2486 ret = -1;
2487 break;
2488 }
2489 }
2490 return ret;
2491 JNI_END
2492
2493
2494 JNI_ENTRY(jint, jni_UnregisterNatives(JNIEnv *env, jclass clazz))
2495 JNIWrapper("UnregisterNatives");
2496 DTRACE_PROBE2(hotspot_jni, UnregisterNatives__entry, env, clazz);
2497 klassOop k = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz));
2498 //%note jni_2
2499 if (Klass::cast(k)->oop_is_instance()) {
2500 for (int index = 0; index < instanceKlass::cast(k)->methods()->length(); index++) {
2501 methodOop m = methodOop(instanceKlass::cast(k)->methods()->obj_at(index));
2502 if (m->is_native()) {
2503 m->clear_native_function();
2504 m->set_signature_handler(NULL);
2505 }
2506 }
2507 }
2508 DTRACE_PROBE1(hotspot_jni, UnregisterNatives__return, 0);
2509 return 0;
2510 JNI_END
2511
2512 //
2513 // Monitor functions
2514 //
2515
2516 DT_RETURN_MARK_DECL(MonitorEnter, jint);
2517
2518 JNI_ENTRY(jint, jni_MonitorEnter(JNIEnv *env, jobject jobj))
2519 DTRACE_PROBE2(hotspot_jni, MonitorEnter__entry, env, jobj);
2520 jint ret = JNI_ERR;
2521 DT_RETURN_MARK(MonitorEnter, jint, (const jint&)ret);
2522
2523 // If the object is null, we can't do anything with it
2524 if (jobj == NULL) {
2525 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2526 }
2527
2528 Handle obj(thread, JNIHandles::resolve_non_null(jobj));
2529 ObjectSynchronizer::jni_enter(obj, CHECK_(JNI_ERR));
2530 ret = JNI_OK;
2531 return ret;
2532 JNI_END
2533
2534 DT_RETURN_MARK_DECL(MonitorExit, jint);
2535
2536 JNI_ENTRY(jint, jni_MonitorExit(JNIEnv *env, jobject jobj))
2537 DTRACE_PROBE2(hotspot_jni, MonitorExit__entry, env, jobj);
2538 jint ret = JNI_ERR;
2539 DT_RETURN_MARK(MonitorExit, jint, (const jint&)ret);
2540
2541 // Don't do anything with a null object
2542 if (jobj == NULL) {
2543 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_ERR);
2544 }
2545
2546 Handle obj(THREAD, JNIHandles::resolve_non_null(jobj));
2547 ObjectSynchronizer::jni_exit(obj(), CHECK_(JNI_ERR));
2548
2549 ret = JNI_OK;
2550 return ret;
2551 JNI_END
2552
2553 //
2554 // Extensions
2555 //
2556
2557 DT_VOID_RETURN_MARK_DECL(GetStringRegion);
2558
2559 JNI_ENTRY(void, jni_GetStringRegion(JNIEnv *env, jstring string, jsize start, jsize len, jchar *buf))
2560 JNIWrapper("GetStringRegion");
2561 DTRACE_PROBE5(hotspot_jni, GetStringRegion__entry, env, string, start, len, buf);
2562 DT_VOID_RETURN_MARK(GetStringRegion);
2563 oop s = JNIHandles::resolve_non_null(string);
2564 int s_len = java_lang_String::length(s);
2565 if (start < 0 || len < 0 || start + len > s_len) {
2566 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2567 } else {
2568 if (len > 0) {
2569 int s_offset = java_lang_String::offset(s);
2570 typeArrayOop s_value = java_lang_String::value(s);
2571 memcpy(buf, s_value->char_at_addr(s_offset+start), sizeof(jchar)*len);
2572 }
2573 }
2574 JNI_END
2575
2576 DT_VOID_RETURN_MARK_DECL(GetStringUTFRegion);
2577
2578 JNI_ENTRY(void, jni_GetStringUTFRegion(JNIEnv *env, jstring string, jsize start, jsize len, char *buf))
2579 JNIWrapper("GetStringUTFRegion");
2580 DTRACE_PROBE5(hotspot_jni, GetStringUTFRegion__entry, env, string, start, len, buf);
2581 DT_VOID_RETURN_MARK(GetStringUTFRegion);
2582 oop s = JNIHandles::resolve_non_null(string);
2583 int s_len = java_lang_String::length(s);
2584 if (start < 0 || len < 0 || start + len > s_len) {
2585 THROW(vmSymbols::java_lang_StringIndexOutOfBoundsException());
2586 } else {
2587 //%note jni_7
2588 if (len > 0) {
2589 ResourceMark rm(THREAD);
2590 char *utf_region = java_lang_String::as_utf8_string(s, start, len);
2591 int utf_len = (int)strlen(utf_region);
2592 memcpy(buf, utf_region, utf_len);
2593 buf[utf_len] = 0;
2594 } else {
2595 // JDK null-terminates the buffer even in len is zero
2596 if (buf != NULL) {
2597 buf[0] = 0;
2598 }
2599 }
2600 }
2601 JNI_END
2602
2603
2604 JNI_ENTRY(void*, jni_GetPrimitiveArrayCritical(JNIEnv *env, jarray array, jboolean *isCopy))
2605 JNIWrapper("GetPrimitiveArrayCritical");
2606 DTRACE_PROBE3(hotspot_jni, GetPrimitiveArrayCritical__entry, env, array, isCopy);
2607 GC_locker::lock_critical(thread);
2608 if (isCopy != NULL) {
2609 *isCopy = JNI_FALSE;
2610 }
2611 oop a = JNIHandles::resolve_non_null(array);
2612 assert(a->is_array(), "just checking");
2613 BasicType type;
2614 if (a->is_objArray()) {
2615 type = T_OBJECT;
2616 } else {
2617 type = typeArrayKlass::cast(a->klass())->element_type();
2618 }
2619 void* ret = arrayOop(a)->base(type);
2620 DTRACE_PROBE1(hotspot_jni, GetPrimitiveArrayCritical__return, ret);
2621 return ret;
2622 JNI_END
2623
2624
2625 JNI_ENTRY(void, jni_ReleasePrimitiveArrayCritical(JNIEnv *env, jarray array, void *carray, jint mode))
2626 JNIWrapper("ReleasePrimitiveArrayCritical");
2627 DTRACE_PROBE4(hotspot_jni, ReleasePrimitiveArrayCritical__entry, env, array, carray, mode);
2628 // The array, carray and mode arguments are ignored
2629 GC_locker::unlock_critical(thread);
2630 DTRACE_PROBE(hotspot_jni, ReleasePrimitiveArrayCritical__return);
2631 JNI_END
2632
2633
2634 JNI_ENTRY(const jchar*, jni_GetStringCritical(JNIEnv *env, jstring string, jboolean *isCopy))
2635 JNIWrapper("GetStringCritical");
2636 DTRACE_PROBE3(hotspot_jni, GetStringCritical__entry, env, string, isCopy);
2637 GC_locker::lock_critical(thread);
2638 if (isCopy != NULL) {
2639 *isCopy = JNI_FALSE;
2640 }
2641 oop s = JNIHandles::resolve_non_null(string);
2642 int s_len = java_lang_String::length(s);
2643 typeArrayOop s_value = java_lang_String::value(s);
2644 int s_offset = java_lang_String::offset(s);
2645 const jchar* ret;
2646 if (s_len > 0) {
2647 ret = s_value->char_at_addr(s_offset);
2648 } else {
2649 ret = (jchar*) s_value->base(T_CHAR);
2650 }
2651 DTRACE_PROBE1(hotspot_jni, GetStringCritical__return, ret);
2652 return ret;
2653 JNI_END
2654
2655
2656 JNI_ENTRY(void, jni_ReleaseStringCritical(JNIEnv *env, jstring str, const jchar *chars))
2657 JNIWrapper("ReleaseStringCritical");
2658 DTRACE_PROBE3(hotspot_jni, ReleaseStringCritical__entry, env, str, chars);
2659 // The str and chars arguments are ignored
2660 GC_locker::unlock_critical(thread);
2661 DTRACE_PROBE(hotspot_jni, ReleaseStringCritical__return);
2662 JNI_END
2663
2664
2665 JNI_ENTRY(jweak, jni_NewWeakGlobalRef(JNIEnv *env, jobject ref))
2666 JNIWrapper("jni_NewWeakGlobalRef");
2667 DTRACE_PROBE2(hotspot_jni, NewWeakGlobalRef__entry, env, ref);
2668 Handle ref_handle(thread, JNIHandles::resolve(ref));
2669 jweak ret = JNIHandles::make_weak_global(ref_handle);
2670 DTRACE_PROBE1(hotspot_jni, NewWeakGlobalRef__return, ret);
2671 return ret;
2672 JNI_END
2673
2674 // Must be JNI_ENTRY (with HandleMark)
2675 JNI_ENTRY(void, jni_DeleteWeakGlobalRef(JNIEnv *env, jweak ref))
2676 JNIWrapper("jni_DeleteWeakGlobalRef");
2677 DTRACE_PROBE2(hotspot_jni, DeleteWeakGlobalRef__entry, env, ref);
2678 JNIHandles::destroy_weak_global(ref);
2679 DTRACE_PROBE(hotspot_jni, DeleteWeakGlobalRef__return);
2680 JNI_END
2681
2682
2683 JNI_QUICK_ENTRY(jboolean, jni_ExceptionCheck(JNIEnv *env))
2684 JNIWrapper("jni_ExceptionCheck");
2685 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__entry, env);
2686 jni_check_async_exceptions(thread);
2687 jboolean ret = (thread->has_pending_exception()) ? JNI_TRUE : JNI_FALSE;
2688 DTRACE_PROBE1(hotspot_jni, ExceptionCheck__return, ret);
2689 return ret;
2690 JNI_END
2691
2692
2693 // Initialization state for three routines below relating to
2694 // java.nio.DirectBuffers
2695 static jint directBufferSupportInitializeStarted = 0;
2696 static volatile jint directBufferSupportInitializeEnded = 0;
2697 static volatile jint directBufferSupportInitializeFailed = 0;
2698 static jclass bufferClass = NULL;
2699 static jclass directBufferClass = NULL;
2700 static jclass directByteBufferClass = NULL;
2701 static jmethodID directByteBufferConstructor = NULL;
2702 static jfieldID directBufferAddressField = NULL;
2703 static jfieldID bufferCapacityField = NULL;
2704
2705 static jclass lookupOne(JNIEnv* env, const char* name, TRAPS) {
2706 Handle loader; // null (bootstrap) loader
2707 Handle protection_domain; // null protection domain
2708
2709 TempNewSymbol sym = SymbolTable::new_symbol(name, CHECK_NULL);
2710 jclass result = find_class_from_class_loader(env, sym, true, loader, protection_domain, true, CHECK_NULL);
2711
2712 if (TraceClassResolution && result != NULL) {
2713 trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
2714 }
2715 return result;
2716 }
2717
2718 // These lookups are done with the NULL (bootstrap) ClassLoader to
2719 // circumvent any security checks that would be done by jni_FindClass.
2720 JNI_ENTRY(bool, lookupDirectBufferClasses(JNIEnv* env))
2721 {
2722 if ((bufferClass = lookupOne(env, "java/nio/Buffer", thread)) == NULL) { return false; }
2723 if ((directBufferClass = lookupOne(env, "sun/nio/ch/DirectBuffer", thread)) == NULL) { return false; }
2724 if ((directByteBufferClass = lookupOne(env, "java/nio/DirectByteBuffer", thread)) == NULL) { return false; }
2725 return true;
2726 }
2727 JNI_END
2728
2729
2730 static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) {
2731 if (directBufferSupportInitializeFailed) {
2732 return false;
2733 }
2734
2735 if (Atomic::cmpxchg(1, &directBufferSupportInitializeStarted, 0) == 0) {
2736 if (!lookupDirectBufferClasses(env)) {
2737 directBufferSupportInitializeFailed = 1;
2738 return false;
2739 }
2740
2741 // Make global references for these
2742 bufferClass = (jclass) env->NewGlobalRef(bufferClass);
2743 directBufferClass = (jclass) env->NewGlobalRef(directBufferClass);
2744 directByteBufferClass = (jclass) env->NewGlobalRef(directByteBufferClass);
2745
2746 // Get needed field and method IDs
2747 directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V");
2748 directBufferAddressField = env->GetFieldID(bufferClass, "address", "J");
2749 bufferCapacityField = env->GetFieldID(bufferClass, "capacity", "I");
2750
2751 if ((directByteBufferConstructor == NULL) ||
2752 (directBufferAddressField == NULL) ||
2753 (bufferCapacityField == NULL)) {
2754 directBufferSupportInitializeFailed = 1;
2755 return false;
2756 }
2757
2758 directBufferSupportInitializeEnded = 1;
2759 } else {
2760 while (!directBufferSupportInitializeEnded && !directBufferSupportInitializeFailed) {
2761 // Set state as yield_all can call os:sleep. On Solaris, yield_all calls
2762 // os::sleep which requires the VM state transition. On other platforms, it
2763 // is not necessary. The following call to change the VM state is purposely
2764 // put inside the loop to avoid potential deadlock when multiple threads
2765 // try to call this method. See 6791815 for more details.
2766 ThreadInVMfromNative tivn(thread);
2767 os::yield_all();
2768 }
2769 }
2770
2771 return !directBufferSupportInitializeFailed;
2772 }
2773
2774 extern "C" jobject JNICALL jni_NewDirectByteBuffer(JNIEnv *env, void* address, jlong capacity)
2775 {
2776 // thread_from_jni_environment() will block if VM is gone.
2777 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2778
2779 JNIWrapper("jni_NewDirectByteBuffer");
2780 DTRACE_PROBE3(hotspot_jni, NewDirectByteBuffer__entry, env, address, capacity);
2781
2782 if (!directBufferSupportInitializeEnded) {
2783 if (!initializeDirectBufferSupport(env, thread)) {
2784 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, NULL);
2785 return NULL;
2786 }
2787 }
2788
2789 // Being paranoid about accidental sign extension on address
2790 jlong addr = (jlong) ((uintptr_t) address);
2791 // NOTE that package-private DirectByteBuffer constructor currently
2792 // takes int capacity
2793 jint cap = (jint) capacity;
2794 jobject ret = env->NewObject(directByteBufferClass, directByteBufferConstructor, addr, cap);
2795 DTRACE_PROBE1(hotspot_jni, NewDirectByteBuffer__return, ret);
2796 return ret;
2797 }
2798
2799 DT_RETURN_MARK_DECL(GetDirectBufferAddress, void*);
2800
2801 extern "C" void* JNICALL jni_GetDirectBufferAddress(JNIEnv *env, jobject buf)
2802 {
2803 // thread_from_jni_environment() will block if VM is gone.
2804 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2805
2806 JNIWrapper("jni_GetDirectBufferAddress");
2807 DTRACE_PROBE2(hotspot_jni, GetDirectBufferAddress__entry, env, buf);
2808 void* ret = NULL;
2809 DT_RETURN_MARK(GetDirectBufferAddress, void*, (const void*&)ret);
2810
2811 if (!directBufferSupportInitializeEnded) {
2812 if (!initializeDirectBufferSupport(env, thread)) {
2813 return 0;
2814 }
2815 }
2816
2817 if ((buf != NULL) && (!env->IsInstanceOf(buf, directBufferClass))) {
2818 return 0;
2819 }
2820
2821 ret = (void*)(intptr_t)env->GetLongField(buf, directBufferAddressField);
2822 return ret;
2823 }
2824
2825 DT_RETURN_MARK_DECL(GetDirectBufferCapacity, jlong);
2826
2827 extern "C" jlong JNICALL jni_GetDirectBufferCapacity(JNIEnv *env, jobject buf)
2828 {
2829 // thread_from_jni_environment() will block if VM is gone.
2830 JavaThread* thread = JavaThread::thread_from_jni_environment(env);
2831
2832 JNIWrapper("jni_GetDirectBufferCapacity");
2833 DTRACE_PROBE2(hotspot_jni, GetDirectBufferCapacity__entry, env, buf);
2834 jlong ret = -1;
2835 DT_RETURN_MARK(GetDirectBufferCapacity, jlong, (const jlong&)ret);
2836
2837 if (!directBufferSupportInitializeEnded) {
2838 if (!initializeDirectBufferSupport(env, thread)) {
2839 ret = 0;
2840 return ret;
2841 }
2842 }
2843
2844 if (buf == NULL) {
2845 return -1;
2846 }
2847
2848 if (!env->IsInstanceOf(buf, directBufferClass)) {
2849 return -1;
2850 }
2851
2852 // NOTE that capacity is currently an int in the implementation
2853 ret = env->GetIntField(buf, bufferCapacityField);
2854 return ret;
2855 }
2856
2857
2858 JNI_LEAF(jint, jni_GetVersion(JNIEnv *env))
2859 JNIWrapper("GetVersion");
2860 DTRACE_PROBE1(hotspot_jni, GetVersion__entry, env);
2861 DTRACE_PROBE1(hotspot_jni, GetVersion__return, CurrentVersion);
2862 return CurrentVersion;
2863 JNI_END
2864
2865 extern struct JavaVM_ main_vm;
2866
2867 JNI_LEAF(jint, jni_GetJavaVM(JNIEnv *env, JavaVM **vm))
2868 JNIWrapper("jni_GetJavaVM");
2869 DTRACE_PROBE2(hotspot_jni, GetJavaVM__entry, env, vm);
2870 *vm = (JavaVM *)(&main_vm);
2871 DTRACE_PROBE1(hotspot_jni, GetJavaVM__return, JNI_OK);
2872 return JNI_OK;
2873 JNI_END
2874
2875 // Structure containing all jni functions
2876 struct JNINativeInterface_ jni_NativeInterface = {
2877 NULL,
2878 NULL,
2879 NULL,
2880
2881 NULL,
2882
2883 jni_GetVersion,
2884
2885 jni_DefineClass,
2886 jni_FindClass,
2887
2888 jni_FromReflectedMethod,
2889 jni_FromReflectedField,
2890
2891 jni_ToReflectedMethod,
2892
2893 jni_GetSuperclass,
2894 jni_IsAssignableFrom,
2895
2896 jni_ToReflectedField,
2897
2898 jni_Throw,
2899 jni_ThrowNew,
2900 jni_ExceptionOccurred,
2901 jni_ExceptionDescribe,
2902 jni_ExceptionClear,
2903 jni_FatalError,
2904
2905 jni_PushLocalFrame,
2906 jni_PopLocalFrame,
2907
2908 jni_NewGlobalRef,
2909 jni_DeleteGlobalRef,
2910 jni_DeleteLocalRef,
2911 jni_IsSameObject,
2912
2913 jni_NewLocalRef,
2914 jni_EnsureLocalCapacity,
2915
2916 jni_AllocObject,
2917 jni_NewObject,
2918 jni_NewObjectV,
2919 jni_NewObjectA,
2920
2921 jni_GetObjectClass,
2922 jni_IsInstanceOf,
2923
2924 jni_GetMethodID,
2925
2926 jni_CallObjectMethod,
2927 jni_CallObjectMethodV,
2928 jni_CallObjectMethodA,
2929 jni_CallBooleanMethod,
2930 jni_CallBooleanMethodV,
2931 jni_CallBooleanMethodA,
2932 jni_CallByteMethod,
2933 jni_CallByteMethodV,
2934 jni_CallByteMethodA,
2935 jni_CallCharMethod,
2936 jni_CallCharMethodV,
2937 jni_CallCharMethodA,
2938 jni_CallShortMethod,
2939 jni_CallShortMethodV,
2940 jni_CallShortMethodA,
2941 jni_CallIntMethod,
2942 jni_CallIntMethodV,
2943 jni_CallIntMethodA,
2944 jni_CallLongMethod,
2945 jni_CallLongMethodV,
2946 jni_CallLongMethodA,
2947 jni_CallFloatMethod,
2948 jni_CallFloatMethodV,
2949 jni_CallFloatMethodA,
2950 jni_CallDoubleMethod,
2951 jni_CallDoubleMethodV,
2952 jni_CallDoubleMethodA,
2953 jni_CallVoidMethod,
2954 jni_CallVoidMethodV,
2955 jni_CallVoidMethodA,
2956
2957 jni_CallNonvirtualObjectMethod,
2958 jni_CallNonvirtualObjectMethodV,
2959 jni_CallNonvirtualObjectMethodA,
2960 jni_CallNonvirtualBooleanMethod,
2961 jni_CallNonvirtualBooleanMethodV,
2962 jni_CallNonvirtualBooleanMethodA,
2963 jni_CallNonvirtualByteMethod,
2964 jni_CallNonvirtualByteMethodV,
2965 jni_CallNonvirtualByteMethodA,
2966 jni_CallNonvirtualCharMethod,
2967 jni_CallNonvirtualCharMethodV,
2968 jni_CallNonvirtualCharMethodA,
2969 jni_CallNonvirtualShortMethod,
2970 jni_CallNonvirtualShortMethodV,
2971 jni_CallNonvirtualShortMethodA,
2972 jni_CallNonvirtualIntMethod,
2973 jni_CallNonvirtualIntMethodV,
2974 jni_CallNonvirtualIntMethodA,
2975 jni_CallNonvirtualLongMethod,
2976 jni_CallNonvirtualLongMethodV,
2977 jni_CallNonvirtualLongMethodA,
2978 jni_CallNonvirtualFloatMethod,
2979 jni_CallNonvirtualFloatMethodV,
2980 jni_CallNonvirtualFloatMethodA,
2981 jni_CallNonvirtualDoubleMethod,
2982 jni_CallNonvirtualDoubleMethodV,
2983 jni_CallNonvirtualDoubleMethodA,
2984 jni_CallNonvirtualVoidMethod,
2985 jni_CallNonvirtualVoidMethodV,
2986 jni_CallNonvirtualVoidMethodA,
2987
2988 jni_GetFieldID,
2989
2990 jni_GetObjectField,
2991 jni_GetBooleanField,
2992 jni_GetByteField,
2993 jni_GetCharField,
2994 jni_GetShortField,
2995 jni_GetIntField,
2996 jni_GetLongField,
2997 jni_GetFloatField,
2998 jni_GetDoubleField,
2999
3000 jni_SetObjectField,
3001 jni_SetBooleanField,
3002 jni_SetByteField,
3003 jni_SetCharField,
3004 jni_SetShortField,
3005 jni_SetIntField,
3006 jni_SetLongField,
3007 jni_SetFloatField,
3008 jni_SetDoubleField,
3009
3010 jni_GetStaticMethodID,
3011
3012 jni_CallStaticObjectMethod,
3013 jni_CallStaticObjectMethodV,
3014 jni_CallStaticObjectMethodA,
3015 jni_CallStaticBooleanMethod,
3016 jni_CallStaticBooleanMethodV,
3017 jni_CallStaticBooleanMethodA,
3018 jni_CallStaticByteMethod,
3019 jni_CallStaticByteMethodV,
3020 jni_CallStaticByteMethodA,
3021 jni_CallStaticCharMethod,
3022 jni_CallStaticCharMethodV,
3023 jni_CallStaticCharMethodA,
3024 jni_CallStaticShortMethod,
3025 jni_CallStaticShortMethodV,
3026 jni_CallStaticShortMethodA,
3027 jni_CallStaticIntMethod,
3028 jni_CallStaticIntMethodV,
3029 jni_CallStaticIntMethodA,
3030 jni_CallStaticLongMethod,
3031 jni_CallStaticLongMethodV,
3032 jni_CallStaticLongMethodA,
3033 jni_CallStaticFloatMethod,
3034 jni_CallStaticFloatMethodV,
3035 jni_CallStaticFloatMethodA,
3036 jni_CallStaticDoubleMethod,
3037 jni_CallStaticDoubleMethodV,
3038 jni_CallStaticDoubleMethodA,
3039 jni_CallStaticVoidMethod,
3040 jni_CallStaticVoidMethodV,
3041 jni_CallStaticVoidMethodA,
3042
3043 jni_GetStaticFieldID,
3044
3045 jni_GetStaticObjectField,
3046 jni_GetStaticBooleanField,
3047 jni_GetStaticByteField,
3048 jni_GetStaticCharField,
3049 jni_GetStaticShortField,
3050 jni_GetStaticIntField,
3051 jni_GetStaticLongField,
3052 jni_GetStaticFloatField,
3053 jni_GetStaticDoubleField,
3054
3055 jni_SetStaticObjectField,
3056 jni_SetStaticBooleanField,
3057 jni_SetStaticByteField,
3058 jni_SetStaticCharField,
3059 jni_SetStaticShortField,
3060 jni_SetStaticIntField,
3061 jni_SetStaticLongField,
3062 jni_SetStaticFloatField,
3063 jni_SetStaticDoubleField,
3064
3065 jni_NewString,
3066 jni_GetStringLength,
3067 jni_GetStringChars,
3068 jni_ReleaseStringChars,
3069
3070 jni_NewStringUTF,
3071 jni_GetStringUTFLength,
3072 jni_GetStringUTFChars,
3073 jni_ReleaseStringUTFChars,
3074
3075 jni_GetArrayLength,
3076
3077 jni_NewObjectArray,
3078 jni_GetObjectArrayElement,
3079 jni_SetObjectArrayElement,
3080
3081 jni_NewBooleanArray,
3082 jni_NewByteArray,
3083 jni_NewCharArray,
3084 jni_NewShortArray,
3085 jni_NewIntArray,
3086 jni_NewLongArray,
3087 jni_NewFloatArray,
3088 jni_NewDoubleArray,
3089
3090 jni_GetBooleanArrayElements,
3091 jni_GetByteArrayElements,
3092 jni_GetCharArrayElements,
3093 jni_GetShortArrayElements,
3094 jni_GetIntArrayElements,
3095 jni_GetLongArrayElements,
3096 jni_GetFloatArrayElements,
3097 jni_GetDoubleArrayElements,
3098
3099 jni_ReleaseBooleanArrayElements,
3100 jni_ReleaseByteArrayElements,
3101 jni_ReleaseCharArrayElements,
3102 jni_ReleaseShortArrayElements,
3103 jni_ReleaseIntArrayElements,
3104 jni_ReleaseLongArrayElements,
3105 jni_ReleaseFloatArrayElements,
3106 jni_ReleaseDoubleArrayElements,
3107
3108 jni_GetBooleanArrayRegion,
3109 jni_GetByteArrayRegion,
3110 jni_GetCharArrayRegion,
3111 jni_GetShortArrayRegion,
3112 jni_GetIntArrayRegion,
3113 jni_GetLongArrayRegion,
3114 jni_GetFloatArrayRegion,
3115 jni_GetDoubleArrayRegion,
3116
3117 jni_SetBooleanArrayRegion,
3118 jni_SetByteArrayRegion,
3119 jni_SetCharArrayRegion,
3120 jni_SetShortArrayRegion,
3121 jni_SetIntArrayRegion,
3122 jni_SetLongArrayRegion,
3123 jni_SetFloatArrayRegion,
3124 jni_SetDoubleArrayRegion,
3125
3126 jni_RegisterNatives,
3127 jni_UnregisterNatives,
3128
3129 jni_MonitorEnter,
3130 jni_MonitorExit,
3131
3132 jni_GetJavaVM,
3133
3134 jni_GetStringRegion,
3135 jni_GetStringUTFRegion,
3136
3137 jni_GetPrimitiveArrayCritical,
3138 jni_ReleasePrimitiveArrayCritical,
3139
3140 jni_GetStringCritical,
3141 jni_ReleaseStringCritical,
3142
3143 jni_NewWeakGlobalRef,
3144 jni_DeleteWeakGlobalRef,
3145
3146 jni_ExceptionCheck,
3147
3148 jni_NewDirectByteBuffer,
3149 jni_GetDirectBufferAddress,
3150 jni_GetDirectBufferCapacity,
3151
3152 // New 1_6 features
3153
3154 jni_GetObjectRefType
3155 };
3156
3157
3158 // For jvmti use to modify jni function table.
3159 // Java threads in native contiues to run until it is transitioned
3160 // to VM at safepoint. Before the transition or before it is blocked
3161 // for safepoint it may access jni function table. VM could crash if
3162 // any java thread access the jni function table in the middle of memcpy.
3163 // To avoid this each function pointers are copied automically.
3164 void copy_jni_function_table(const struct JNINativeInterface_ *new_jni_NativeInterface) {
3165 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
3166 intptr_t *a = (intptr_t *) jni_functions();
3167 intptr_t *b = (intptr_t *) new_jni_NativeInterface;
3168 for (uint i=0; i < sizeof(struct JNINativeInterface_)/sizeof(void *); i++) {
3169 Atomic::store_ptr(*b++, a++);
3170 }
3171 }
3172
3173 void quicken_jni_functions() {
3174 // Replace Get<Primitive>Field with fast versions
3175 if (UseFastJNIAccessors && !JvmtiExport::can_post_field_access()
3176 && !VerifyJNIFields && !TraceJNICalls && !CountJNICalls && !CheckJNICalls
3177 #if defined(_WINDOWS) && defined(IA32) && defined(COMPILER2)
3178 // windows x86 currently needs SEH wrapper and the gain of the fast
3179 // versions currently isn't certain for server vm on uniprocessor.
3180 && os::is_MP()
3181 #endif
3182 ) {
3183 address func;
3184 func = JNI_FastGetField::generate_fast_get_boolean_field();
3185 if (func != (address)-1) {
3186 jni_NativeInterface.GetBooleanField = (GetBooleanField_t)func;
3187 }
3188 func = JNI_FastGetField::generate_fast_get_byte_field();
3189 if (func != (address)-1) {
3190 jni_NativeInterface.GetByteField = (GetByteField_t)func;
3191 }
3192 func = JNI_FastGetField::generate_fast_get_char_field();
3193 if (func != (address)-1) {
3194 jni_NativeInterface.GetCharField = (GetCharField_t)func;
3195 }
3196 func = JNI_FastGetField::generate_fast_get_short_field();
3197 if (func != (address)-1) {
3198 jni_NativeInterface.GetShortField = (GetShortField_t)func;
3199 }
3200 func = JNI_FastGetField::generate_fast_get_int_field();
3201 if (func != (address)-1) {
3202 jni_NativeInterface.GetIntField = (GetIntField_t)func;
3203 }
3204 func = JNI_FastGetField::generate_fast_get_long_field();
3205 if (func != (address)-1) {
3206 jni_NativeInterface.GetLongField = (GetLongField_t)func;
3207 }
3208 func = JNI_FastGetField::generate_fast_get_float_field();
3209 if (func != (address)-1) {
3210 jni_NativeInterface.GetFloatField = (GetFloatField_t)func;
3211 }
3212 func = JNI_FastGetField::generate_fast_get_double_field();
3213 if (func != (address)-1) {
3214 jni_NativeInterface.GetDoubleField = (GetDoubleField_t)func;
3215 }
3216 }
3217 }
3218
3219 // Returns the function structure
3220 struct JNINativeInterface_* jni_functions() {
3221 #ifndef JNICHECK_KERNEL
3222 if (CheckJNICalls) return jni_functions_check();
3223 #else // JNICHECK_KERNEL
3224 if (CheckJNICalls) warning("-Xcheck:jni is not supported in kernel vm.");
3225 #endif // JNICHECK_KERNEL
3226 return &jni_NativeInterface;
3227 }
3228
3229 // Returns the function structure
3230 struct JNINativeInterface_* jni_functions_nocheck() {
3231 return &jni_NativeInterface;
3232 }
3233
3234
3235 // Invocation API
3236
3237
3238 // Forward declaration
3239 extern const struct JNIInvokeInterface_ jni_InvokeInterface;
3240
3241 // Global invocation API vars
3242 volatile jint vm_created = 0;
3243 // Indicate whether it is safe to recreate VM
3244 volatile jint safe_to_recreate_vm = 1;
3245 struct JavaVM_ main_vm = {&jni_InvokeInterface};
3246
3247
3248 #define JAVASTACKSIZE (400 * 1024) /* Default size of a thread java stack */
3249 enum { VERIFY_NONE, VERIFY_REMOTE, VERIFY_ALL };
3250
3251 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, void*);
3252 DT_RETURN_MARK_DECL(GetDefaultJavaVMInitArgs, jint);
3253
3254 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args_) {
3255 HS_DTRACE_PROBE1(hotspot_jni, GetDefaultJavaVMInitArgs__entry, args_);
3256 JDK1_1InitArgs *args = (JDK1_1InitArgs *)args_;
3257 jint ret = JNI_ERR;
3258 DT_RETURN_MARK(GetDefaultJavaVMInitArgs, jint, (const jint&)ret);
3259
3260 if (Threads::is_supported_jni_version(args->version)) {
3261 ret = JNI_OK;
3262 }
3263 // 1.1 style no longer supported in hotspot.
3264 // According the JNI spec, we should update args->version on return.
3265 // We also use the structure to communicate with launcher about default
3266 // stack size.
3267 if (args->version == JNI_VERSION_1_1) {
3268 args->version = JNI_VERSION_1_2;
3269 // javaStackSize is int in arguments structure
3270 assert(jlong(ThreadStackSize) * K < INT_MAX, "integer overflow");
3271 args->javaStackSize = (jint)(ThreadStackSize * K);
3272 }
3273 return ret;
3274 }
3275
3276 HS_DTRACE_PROBE_DECL3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3277 DT_RETURN_MARK_DECL(CreateJavaVM, jint);
3278
3279 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) {
3280 HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
3281
3282 jint result = JNI_ERR;
3283 DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result);
3284
3285 // We're about to use Atomic::xchg for synchronization. Some Zero
3286 // platforms use the GCC builtin __sync_lock_test_and_set for this,
3287 // but __sync_lock_test_and_set is not guaranteed to do what we want
3288 // on all architectures. So we check it works before relying on it.
3289 #if defined(ZERO) && defined(ASSERT)
3290 {
3291 jint a = 0xcafebabe;
3292 jint b = Atomic::xchg(0xdeadbeef, &a);
3293 void *c = &a;
3294 void *d = Atomic::xchg_ptr(&b, &c);
3295 assert(a == (jint) 0xdeadbeef && b == (jint) 0xcafebabe, "Atomic::xchg() works");
3296 assert(c == &b && d == &a, "Atomic::xchg_ptr() works");
3297 }
3298 #endif // ZERO && ASSERT
3299
3300 // At the moment it's only possible to have one Java VM,
3301 // since some of the runtime state is in global variables.
3302
3303 // We cannot use our mutex locks here, since they only work on
3304 // Threads. We do an atomic compare and exchange to ensure only
3305 // one thread can call this method at a time
3306
3307 // We use Atomic::xchg rather than Atomic::add/dec since on some platforms
3308 // the add/dec implementations are dependent on whether we are running
3309 // on a multiprocessor, and at this stage of initialization the os::is_MP
3310 // function used to determine this will always return false. Atomic::xchg
3311 // does not have this problem.
3312 if (Atomic::xchg(1, &vm_created) == 1) {
3313 return JNI_ERR; // already created, or create attempt in progress
3314 }
3315 if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) {
3316 return JNI_ERR; // someone tried and failed and retry not allowed.
3317 }
3318
3319 assert(vm_created == 1, "vm_created is true during the creation");
3320
3321 /**
3322 * Certain errors during initialization are recoverable and do not
3323 * prevent this method from being called again at a later time
3324 * (perhaps with different arguments). However, at a certain
3325 * point during initialization if an error occurs we cannot allow
3326 * this function to be called again (or it will crash). In those
3327 * situations, the 'canTryAgain' flag is set to false, which atomically
3328 * sets safe_to_recreate_vm to 1, such that any new call to
3329 * JNI_CreateJavaVM will immediately fail using the above logic.
3330 */
3331 bool can_try_again = true;
3332
3333 result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again);
3334 if (result == JNI_OK) {
3335 JavaThread *thread = JavaThread::current();
3336 /* thread is thread_in_vm here */
3337 *vm = (JavaVM *)(&main_vm);
3338 *(JNIEnv**)penv = thread->jni_environment();
3339
3340 // Tracks the time application was running before GC
3341 RuntimeService::record_application_start();
3342
3343 // Notify JVMTI
3344 if (JvmtiExport::should_post_thread_life()) {
3345 JvmtiExport::post_thread_start(thread);
3346 }
3347 // Check if we should compile all classes on bootclasspath
3348 NOT_PRODUCT(if (CompileTheWorld) ClassLoader::compile_the_world();)
3349 // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving.
3350 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3351 } else {
3352 if (can_try_again) {
3353 // reset safe_to_recreate_vm to 1 so that retrial would be possible
3354 safe_to_recreate_vm = 1;
3355 }
3356
3357 // Creation failed. We must reset vm_created
3358 *vm = 0;
3359 *(JNIEnv**)penv = 0;
3360 // reset vm_created last to avoid race condition. Use OrderAccess to
3361 // control both compiler and architectural-based reordering.
3362 OrderAccess::release_store(&vm_created, 0);
3363 }
3364
3365 NOT_PRODUCT(test_error_handler(ErrorHandlerTest));
3366 return result;
3367 }
3368
3369 HS_DTRACE_PROBE_DECL3(hotspot_jni, GetCreatedJavaVMs__entry, \
3370 JavaVM**, jsize, jsize*);
3371 HS_DTRACE_PROBE_DECL1(hotspot_jni, GetCreatedJavaVMs__return, jint);
3372
3373 _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vm_buf, jsize bufLen, jsize *numVMs) {
3374 // See bug 4367188, the wrapper can sometimes cause VM crashes
3375 // JNIWrapper("GetCreatedJavaVMs");
3376 HS_DTRACE_PROBE3(hotspot_jni, GetCreatedJavaVMs__entry, \
3377 vm_buf, bufLen, numVMs);
3378 if (vm_created) {
3379 if (numVMs != NULL) *numVMs = 1;
3380 if (bufLen > 0) *vm_buf = (JavaVM *)(&main_vm);
3381 } else {
3382 if (numVMs != NULL) *numVMs = 0;
3383 }
3384 HS_DTRACE_PROBE1(hotspot_jni, GetCreatedJavaVMs__return, JNI_OK);
3385 return JNI_OK;
3386 }
3387
3388 extern "C" {
3389
3390 DT_RETURN_MARK_DECL(DestroyJavaVM, jint);
3391
3392 jint JNICALL jni_DestroyJavaVM(JavaVM *vm) {
3393 DTRACE_PROBE1(hotspot_jni, DestroyJavaVM__entry, vm);
3394 jint res = JNI_ERR;
3395 DT_RETURN_MARK(DestroyJavaVM, jint, (const jint&)res);
3396
3397 if (!vm_created) {
3398 res = JNI_ERR;
3399 return res;
3400 }
3401
3402 JNIWrapper("DestroyJavaVM");
3403 JNIEnv *env;
3404 JavaVMAttachArgs destroyargs;
3405 destroyargs.version = CurrentVersion;
3406 destroyargs.name = (char *)"DestroyJavaVM";
3407 destroyargs.group = NULL;
3408 res = vm->AttachCurrentThread((void **)&env, (void *)&destroyargs);
3409 if (res != JNI_OK) {
3410 return res;
3411 }
3412
3413 // Since this is not a JVM_ENTRY we have to set the thread state manually before entering.
3414 JavaThread* thread = JavaThread::current();
3415 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3416 if (Threads::destroy_vm()) {
3417 // Should not change thread state, VM is gone
3418 vm_created = false;
3419 res = JNI_OK;
3420 return res;
3421 } else {
3422 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3423 res = JNI_ERR;
3424 return res;
3425 }
3426 }
3427
3428
3429 static jint attach_current_thread(JavaVM *vm, void **penv, void *_args, bool daemon) {
3430 JavaVMAttachArgs *args = (JavaVMAttachArgs *) _args;
3431
3432 // Check below commented out from JDK1.2fcs as well
3433 /*
3434 if (args && (args->version != JNI_VERSION_1_1 || args->version != JNI_VERSION_1_2)) {
3435 return JNI_EVERSION;
3436 }
3437 */
3438
3439 Thread* t = ThreadLocalStorage::get_thread_slow();
3440 if (t != NULL) {
3441 // If the thread has been attached this operation is a no-op
3442 *(JNIEnv**)penv = ((JavaThread*) t)->jni_environment();
3443 return JNI_OK;
3444 }
3445
3446 // Create a thread and mark it as attaching so it will be skipped by the
3447 // ThreadsListEnumerator - see CR 6404306
3448 JavaThread* thread = new JavaThread(true);
3449
3450 // Set correct safepoint info. The thread is going to call into Java when
3451 // initializing the Java level thread object. Hence, the correct state must
3452 // be set in order for the Safepoint code to deal with it correctly.
3453 thread->set_thread_state(_thread_in_vm);
3454 // Must do this before initialize_thread_local_storage
3455 thread->record_stack_base_and_size();
3456
3457 thread->initialize_thread_local_storage();
3458
3459 if (!os::create_attached_thread(thread)) {
3460 delete thread;
3461 return JNI_ERR;
3462 }
3463 // Enable stack overflow checks
3464 thread->create_stack_guard_pages();
3465
3466 thread->initialize_tlab();
3467
3468 thread->cache_global_variables();
3469
3470 // Crucial that we do not have a safepoint check for this thread, since it has
3471 // not been added to the Thread list yet.
3472 { Threads_lock->lock_without_safepoint_check();
3473 // This must be inside this lock in order to get FullGCALot to work properly, i.e., to
3474 // avoid this thread trying to do a GC before it is added to the thread-list
3475 thread->set_active_handles(JNIHandleBlock::allocate_block());
3476 Threads::add(thread, daemon);
3477 Threads_lock->unlock();
3478 }
3479 // Create thread group and name info from attach arguments
3480 oop group = NULL;
3481 char* thread_name = NULL;
3482 if (args != NULL && Threads::is_supported_jni_version(args->version)) {
3483 group = JNIHandles::resolve(args->group);
3484 thread_name = args->name; // may be NULL
3485 }
3486 if (group == NULL) group = Universe::main_thread_group();
3487
3488 // Create Java level thread object and attach it to this thread
3489 bool attach_failed = false;
3490 {
3491 EXCEPTION_MARK;
3492 HandleMark hm(THREAD);
3493 Handle thread_group(THREAD, group);
3494 thread->allocate_threadObj(thread_group, thread_name, daemon, THREAD);
3495 if (HAS_PENDING_EXCEPTION) {
3496 CLEAR_PENDING_EXCEPTION;
3497 // cleanup outside the handle mark.
3498 attach_failed = true;
3499 }
3500 }
3501
3502 if (attach_failed) {
3503 // Added missing cleanup
3504 thread->cleanup_failed_attach_current_thread();
3505 return JNI_ERR;
3506 }
3507
3508 // mark the thread as no longer attaching
3509 // this uses a fence to push the change through so we don't have
3510 // to regrab the threads_lock
3511 thread->set_attached();
3512
3513 // Set java thread status.
3514 java_lang_Thread::set_thread_status(thread->threadObj(),
3515 java_lang_Thread::RUNNABLE);
3516
3517 // Notify the debugger
3518 if (JvmtiExport::should_post_thread_life()) {
3519 JvmtiExport::post_thread_start(thread);
3520 }
3521
3522 *(JNIEnv**)penv = thread->jni_environment();
3523
3524 // Now leaving the VM, so change thread_state. This is normally automatically taken care
3525 // of in the JVM_ENTRY. But in this situation we have to do it manually. Notice, that by
3526 // using ThreadStateTransition::transition, we do a callback to the safepoint code if
3527 // needed.
3528
3529 ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
3530
3531 // Perform any platform dependent FPU setup
3532 os::setup_fpu();
3533
3534 return JNI_OK;
3535 }
3536
3537
3538 jint JNICALL jni_AttachCurrentThread(JavaVM *vm, void **penv, void *_args) {
3539 DTRACE_PROBE3(hotspot_jni, AttachCurrentThread__entry, vm, penv, _args);
3540 if (!vm_created) {
3541 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, JNI_ERR);
3542 return JNI_ERR;
3543 }
3544
3545 JNIWrapper("AttachCurrentThread");
3546 jint ret = attach_current_thread(vm, penv, _args, false);
3547 DTRACE_PROBE1(hotspot_jni, AttachCurrentThread__return, ret);
3548 return ret;
3549 }
3550
3551
3552 jint JNICALL jni_DetachCurrentThread(JavaVM *vm) {
3553 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__entry, vm);
3554 VM_Exit::block_if_vm_exited();
3555
3556 JNIWrapper("DetachCurrentThread");
3557
3558 // If the thread has been deattacted the operations is a no-op
3559 if (ThreadLocalStorage::thread() == NULL) {
3560 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3561 return JNI_OK;
3562 }
3563
3564 JavaThread* thread = JavaThread::current();
3565 if (thread->has_last_Java_frame()) {
3566 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_ERR);
3567 // Can't detach a thread that's running java, that can't work.
3568 return JNI_ERR;
3569 }
3570
3571 // Safepoint support. Have to do call-back to safepoint code, if in the
3572 // middel of a safepoint operation
3573 ThreadStateTransition::transition_from_native(thread, _thread_in_vm);
3574
3575 // XXX: Note that JavaThread::exit() call below removes the guards on the
3576 // stack pages set up via enable_stack_{red,yellow}_zone() calls
3577 // above in jni_AttachCurrentThread. Unfortunately, while the setting
3578 // of the guards is visible in jni_AttachCurrentThread above,
3579 // the removal of the guards is buried below in JavaThread::exit()
3580 // here. The abstraction should be more symmetrically either exposed
3581 // or hidden (e.g. it could probably be hidden in the same
3582 // (platform-dependent) methods where we do alternate stack
3583 // maintenance work?)
3584 thread->exit(false, JavaThread::jni_detach);
3585 delete thread;
3586
3587 DTRACE_PROBE1(hotspot_jni, DetachCurrentThread__return, JNI_OK);
3588 return JNI_OK;
3589 }
3590
3591 DT_RETURN_MARK_DECL(GetEnv, jint);
3592
3593 jint JNICALL jni_GetEnv(JavaVM *vm, void **penv, jint version) {
3594 DTRACE_PROBE3(hotspot_jni, GetEnv__entry, vm, penv, version);
3595 jint ret = JNI_ERR;
3596 DT_RETURN_MARK(GetEnv, jint, (const jint&)ret);
3597
3598 if (!vm_created) {
3599 *penv = NULL;
3600 ret = JNI_EDETACHED;
3601 return ret;
3602 }
3603
3604 if (JvmtiExport::is_jvmti_version(version)) {
3605 ret = JvmtiExport::get_jvmti_interface(vm, penv, version);
3606 return ret;
3607 }
3608
3609 #ifndef JVMPI_VERSION_1
3610 // need these in order to be polite about older agents
3611 #define JVMPI_VERSION_1 ((jint)0x10000001)
3612 #define JVMPI_VERSION_1_1 ((jint)0x10000002)
3613 #define JVMPI_VERSION_1_2 ((jint)0x10000003)
3614 #endif // !JVMPI_VERSION_1
3615
3616 Thread* thread = ThreadLocalStorage::thread();
3617 if (thread != NULL && thread->is_Java_thread()) {
3618 if (Threads::is_supported_jni_version_including_1_1(version)) {
3619 *(JNIEnv**)penv = ((JavaThread*) thread)->jni_environment();
3620 ret = JNI_OK;
3621 return ret;
3622
3623 } else if (version == JVMPI_VERSION_1 ||
3624 version == JVMPI_VERSION_1_1 ||
3625 version == JVMPI_VERSION_1_2) {
3626 tty->print_cr("ERROR: JVMPI, an experimental interface, is no longer supported.");
3627 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3628 ret = JNI_EVERSION;
3629 return ret;
3630 } else if (JvmtiExport::is_jvmdi_version(version)) {
3631 tty->print_cr("FATAL ERROR: JVMDI is no longer supported.");
3632 tty->print_cr("Please use the supported interface: the JVM Tool Interface (JVM TI).");
3633 ret = JNI_EVERSION;
3634 return ret;
3635 } else {
3636 *penv = NULL;
3637 ret = JNI_EVERSION;
3638 return ret;
3639 }
3640 } else {
3641 *penv = NULL;
3642 ret = JNI_EDETACHED;
3643 return ret;
3644 }
3645 }
3646
3647
3648 jint JNICALL jni_AttachCurrentThreadAsDaemon(JavaVM *vm, void **penv, void *_args) {
3649 DTRACE_PROBE3(hotspot_jni, AttachCurrentThreadAsDaemon__entry, vm, penv, _args);
3650 if (!vm_created) {
3651 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, JNI_ERR);
3652 return JNI_ERR;
3653 }
3654
3655 JNIWrapper("AttachCurrentThreadAsDaemon");
3656 jint ret = attach_current_thread(vm, penv, _args, true);
3657 DTRACE_PROBE1(hotspot_jni, AttachCurrentThreadAsDaemon__return, ret);
3658 return ret;
3659 }
3660
3661
3662 } // End extern "C"
3663
3664 const struct JNIInvokeInterface_ jni_InvokeInterface = {
3665 NULL,
3666 NULL,
3667 NULL,
3668
3669 jni_DestroyJavaVM,
3670 jni_AttachCurrentThread,
3671 jni_DetachCurrentThread,
3672 jni_GetEnv,
3673 jni_AttachCurrentThreadAsDaemon
3674 };