1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "dex_file-inl.h"
18 #include "entrypoints/entrypoint_utils-inl.h"
19 #include "mirror/art_method-inl.h"
20 #include "mirror/class-inl.h"
21 #include "mirror/object.h"
22 #include "mirror/object-inl.h"
23 #include "mirror/object_array-inl.h"
24 #include "scoped_thread_state_change.h"
25 #include "thread.h"
26 #include "verify_object-inl.h"
27
28 namespace art {
29
30 // Called on entry to JNI, transition out of Runnable and release share of mutator_lock_.
JniMethodStart(Thread * self)31 extern uint32_t JniMethodStart(Thread* self) {
32 JNIEnvExt* env = self->GetJniEnv();
33 DCHECK(env != nullptr);
34 uint32_t saved_local_ref_cookie = env->local_ref_cookie;
35 env->local_ref_cookie = env->locals.GetSegmentState();
36 mirror::ArtMethod* native_method = self->GetManagedStack()->GetTopQuickFrame()->AsMirrorPtr();
37 if (!native_method->IsFastNative()) {
38 // When not fast JNI we transition out of runnable.
39 self->TransitionFromRunnableToSuspended(kNative);
40 }
41 return saved_local_ref_cookie;
42 }
43
JniMethodStartSynchronized(jobject to_lock,Thread * self)44 extern uint32_t JniMethodStartSynchronized(jobject to_lock, Thread* self) {
45 self->DecodeJObject(to_lock)->MonitorEnter(self);
46 return JniMethodStart(self);
47 }
48
49 // TODO: NO_THREAD_SAFETY_ANALYSIS due to different control paths depending on fast JNI.
GoToRunnable(Thread * self)50 static void GoToRunnable(Thread* self) NO_THREAD_SAFETY_ANALYSIS {
51 mirror::ArtMethod* native_method = self->GetManagedStack()->GetTopQuickFrame()->AsMirrorPtr();
52 bool is_fast = native_method->IsFastNative();
53 if (!is_fast) {
54 self->TransitionFromSuspendedToRunnable();
55 } else if (UNLIKELY(self->TestAllFlags())) {
56 // In fast JNI mode we never transitioned out of runnable. Perform a suspend check if there
57 // is a flag raised.
58 DCHECK(Locks::mutator_lock_->IsSharedHeld(self));
59 CheckSuspend(self);
60 }
61 }
62
PopLocalReferences(uint32_t saved_local_ref_cookie,Thread * self)63 static void PopLocalReferences(uint32_t saved_local_ref_cookie, Thread* self)
64 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
65 JNIEnvExt* env = self->GetJniEnv();
66 env->locals.SetSegmentState(env->local_ref_cookie);
67 env->local_ref_cookie = saved_local_ref_cookie;
68 self->PopHandleScope();
69 }
70
JniMethodEnd(uint32_t saved_local_ref_cookie,Thread * self)71 extern void JniMethodEnd(uint32_t saved_local_ref_cookie, Thread* self) {
72 GoToRunnable(self);
73 PopLocalReferences(saved_local_ref_cookie, self);
74 }
75
76
JniMethodEndSynchronized(uint32_t saved_local_ref_cookie,jobject locked,Thread * self)77 extern void JniMethodEndSynchronized(uint32_t saved_local_ref_cookie, jobject locked,
78 Thread* self) {
79 GoToRunnable(self);
80 UnlockJniSynchronizedMethod(locked, self); // Must decode before pop.
81 PopLocalReferences(saved_local_ref_cookie, self);
82 }
83
JniMethodEndWithReference(jobject result,uint32_t saved_local_ref_cookie,Thread * self)84 extern mirror::Object* JniMethodEndWithReference(jobject result, uint32_t saved_local_ref_cookie,
85 Thread* self) {
86 GoToRunnable(self);
87 mirror::Object* o = self->DecodeJObject(result); // Must decode before pop.
88 PopLocalReferences(saved_local_ref_cookie, self);
89 // Process result.
90 if (UNLIKELY(self->GetJniEnv()->check_jni)) {
91 if (self->IsExceptionPending()) {
92 return NULL;
93 }
94 CheckReferenceResult(o, self);
95 }
96 VerifyObject(o);
97 return o;
98 }
99
JniMethodEndWithReferenceSynchronized(jobject result,uint32_t saved_local_ref_cookie,jobject locked,Thread * self)100 extern mirror::Object* JniMethodEndWithReferenceSynchronized(jobject result,
101 uint32_t saved_local_ref_cookie,
102 jobject locked, Thread* self) {
103 GoToRunnable(self);
104 UnlockJniSynchronizedMethod(locked, self); // Must decode before pop.
105 mirror::Object* o = self->DecodeJObject(result);
106 PopLocalReferences(saved_local_ref_cookie, self);
107 // Process result.
108 if (UNLIKELY(self->GetJniEnv()->check_jni)) {
109 if (self->IsExceptionPending()) {
110 return NULL;
111 }
112 CheckReferenceResult(o, self);
113 }
114 VerifyObject(o);
115 return o;
116 }
117
118 } // namespace art
119