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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mirror/object-inl.h"
#include "thread-inl.h"
#include "verify_object-inl.h"
namespace art {
// Called on entry to JNI, transition out of Runnable and release share of mutator_lock_.
extern uint32_t JniMethodStart(Thread* self) {
JNIEnvExt* env = self->GetJniEnv();
DCHECK(env != nullptr);
uint32_t saved_local_ref_cookie = env->local_ref_cookie;
env->local_ref_cookie = env->locals.GetSegmentState();
mirror::ArtMethod* native_method = self->GetManagedStack()->GetTopQuickFrame()->AsMirrorPtr();
if (!native_method->IsFastNative()) {
// When not fast JNI we transition out of runnable.
self->TransitionFromRunnableToSuspended(kNative);
}
return saved_local_ref_cookie;
}
extern uint32_t JniMethodStartSynchronized(jobject to_lock, Thread* self) {
self->DecodeJObject(to_lock)->MonitorEnter(self);
return JniMethodStart(self);
}
// TODO: NO_THREAD_SAFETY_ANALYSIS due to different control paths depending on fast JNI.
static void GoToRunnable(Thread* self) NO_THREAD_SAFETY_ANALYSIS {
mirror::ArtMethod* native_method = self->GetManagedStack()->GetTopQuickFrame()->AsMirrorPtr();
bool is_fast = native_method->IsFastNative();
if (!is_fast) {
self->TransitionFromSuspendedToRunnable();
} else if (UNLIKELY(self->TestAllFlags())) {
// In fast JNI mode we never transitioned out of runnable. Perform a suspend check if there
// is a flag raised.
DCHECK(Locks::mutator_lock_->IsSharedHeld(self));
self->CheckSuspend();
}
}
static void PopLocalReferences(uint32_t saved_local_ref_cookie, Thread* self)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
JNIEnvExt* env = self->GetJniEnv();
env->locals.SetSegmentState(env->local_ref_cookie);
env->local_ref_cookie = saved_local_ref_cookie;
self->PopHandleScope();
}
extern void JniMethodEnd(uint32_t saved_local_ref_cookie, Thread* self) {
GoToRunnable(self);
PopLocalReferences(saved_local_ref_cookie, self);
}
extern void JniMethodEndSynchronized(uint32_t saved_local_ref_cookie, jobject locked,
Thread* self) {
GoToRunnable(self);
UnlockJniSynchronizedMethod(locked, self); // Must decode before pop.
PopLocalReferences(saved_local_ref_cookie, self);
}
extern mirror::Object* JniMethodEndWithReference(jobject result, uint32_t saved_local_ref_cookie,
Thread* self) {
GoToRunnable(self);
mirror::Object* o = self->DecodeJObject(result); // Must decode before pop.
PopLocalReferences(saved_local_ref_cookie, self);
// Process result.
if (UNLIKELY(self->GetJniEnv()->check_jni)) {
if (self->IsExceptionPending()) {
return NULL;
}
CheckReferenceResult(o, self);
}
VerifyObject(o);
return o;
}
extern mirror::Object* JniMethodEndWithReferenceSynchronized(jobject result,
uint32_t saved_local_ref_cookie,
jobject locked, Thread* self) {
GoToRunnable(self);
UnlockJniSynchronizedMethod(locked, self); // Must decode before pop.
mirror::Object* o = self->DecodeJObject(result);
PopLocalReferences(saved_local_ref_cookie, self);
// Process result.
if (UNLIKELY(self->GetJniEnv()->check_jni)) {
if (self->IsExceptionPending()) {
return NULL;
}
CheckReferenceResult(o, self);
}
VerifyObject(o);
return o;
}
} // namespace art
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