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