blob: b312c5aead3bc405ade238c7620ea9d6aa709038 [file] [log] [blame]
// Copyright 2011 Google Inc. All Rights Reserved.
// Author: enh@google.com (Elliott Hughes)
#include "jni_internal.h"
namespace art {
// Entry/exit processing for all JNI calls.
//
// This performs the necessary thread state switching, lets us amortize the
// cost of working out the current thread, and lets us check (and repair) apps
// that are using a JNIEnv on the wrong thread.
class ScopedJniThreadState {
public:
explicit ScopedJniThreadState(JNIEnv* env)
: env_(reinterpret_cast<JNIEnvExt*>(env)) {
self_ = ThreadForEnv(env);
old_thread_state_ = self_->SetState(Thread::kRunnable);
}
~ScopedJniThreadState() {
self_->SetState(old_thread_state_);
}
JNIEnvExt* Env() {
return env_;
}
Thread* Self() {
return self_;
}
JavaVMExt* Vm() {
return env_->vm;
}
private:
static Thread* ThreadForEnv(JNIEnv* env) {
JNIEnvExt* full_env(reinterpret_cast<JNIEnvExt*>(env));
Thread* env_self = full_env->self;
Thread* self = full_env->vm->work_around_app_jni_bugs ? Thread::Current() : env_self;
if (self != env_self) {
LOG(ERROR) << "JNI ERROR: JNIEnv for " << *env_self
<< " used on " << *self;
// TODO: dump stack
}
return self;
}
JNIEnvExt* env_;
Thread* self_;
Thread::State old_thread_state_;
DISALLOW_COPY_AND_ASSIGN(ScopedJniThreadState);
};
} // namespace art