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/*
* Copyright (C) 2011 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.
*/
#ifndef ART_SRC_JNI_INTERNAL_H_
#define ART_SRC_JNI_INTERNAL_H_
#include "jni.h"
#include "heap.h"
#include "indirect_reference_table.h"
#include "macros.h"
#include "mutex.h"
#include "reference_table.h"
#include "runtime.h"
#include <iosfwd>
#include <string>
#ifndef NATIVE_METHOD
#define NATIVE_METHOD(className, functionName, signature) \
{ #functionName, signature, reinterpret_cast<void*>(className ## _ ## functionName) }
#endif
#define REGISTER_NATIVE_METHODS(jni_class_name) \
RegisterNativeMethods(env, jni_class_name, gMethods, arraysize(gMethods))
namespace art {
class ClassLoader;
class Field;
union JValue;
class Libraries;
class Method;
class Thread;
void SetJniGlobalsMax(size_t max);
void JniAbort(const char* jni_function_name);
void* FindNativeMethod(Thread* thread);
void RegisterNativeMethods(JNIEnv* env, const char* jni_class_name, const JNINativeMethod* methods, size_t method_count);
template<typename T> T Decode(JNIEnv*, jobject);
template<typename T> T AddLocalReference(JNIEnv*, const Object*);
inline Field* DecodeField(jfieldID fid) {
#ifdef MOVING_GARBAGE_COLLECTOR
// TODO: we should make these unique weak globals if Field instances can ever move.
UNIMPLEMENTED(WARNING);
#endif
return reinterpret_cast<Field*>(fid);
}
inline jfieldID EncodeField(Field* field) {
#ifdef MOVING_GARBAGE_COLLECTOR
UNIMPLEMENTED(WARNING);
#endif
return reinterpret_cast<jfieldID>(field);
}
inline Method* DecodeMethod(jmethodID mid) {
#ifdef MOVING_GARBAGE_COLLECTOR
// TODO: we should make these unique weak globals if Method instances can ever move.
UNIMPLEMENTED(WARNING);
#endif
return reinterpret_cast<Method*>(mid);
}
inline jmethodID EncodeMethod(Method* method) {
#ifdef MOVING_GARBAGE_COLLECTOR
UNIMPLEMENTED(WARNING);
#endif
return reinterpret_cast<jmethodID>(method);
}
size_t NumArgArrayBytes(const char* shorty, uint32_t shorty_len);
JValue InvokeWithJValues(JNIEnv* env, jobject obj, jmethodID mid, jvalue* args);
JValue InvokeWithJValues(Thread* self, Object* receiver, Method* m, JValue* args);
int ThrowNewException(JNIEnv* env, jclass exception_class, const char* msg, jobject cause);
struct JavaVMExt : public JavaVM {
JavaVMExt(Runtime* runtime, Runtime::ParsedOptions* options);
~JavaVMExt();
/**
* Loads the given shared library. 'path' is an absolute pathname.
*
* Returns 'true' on success. On failure, sets 'detail' to a
* human-readable description of the error.
*/
bool LoadNativeLibrary(const std::string& path, ClassLoader* class_loader, std::string& detail);
/**
* Returns a pointer to the code for the native method 'm', found
* using dlsym(3) on every native library that's been loaded so far.
*/
void* FindCodeForNativeMethod(Method* m);
void DumpForSigQuit(std::ostream& os);
void DumpReferenceTables(std::ostream& os);
void SetCheckJniEnabled(bool enabled);
void VisitRoots(Heap::RootVisitor*, void*);
Runtime* runtime;
// Used for testing. By default, we'll LOG(FATAL) the reason.
void (*check_jni_abort_hook)(void* data, const std::string& reason);
void* check_jni_abort_hook_data;
// Extra checking.
bool check_jni;
bool force_copy;
// Extra diagnostics.
std::string trace;
// Used to provide compatibility for apps that assumed direct references.
bool work_around_app_jni_bugs;
// Used to hold references to pinned primitive arrays.
Mutex pins_lock;
ReferenceTable pin_table;
// JNI global references.
Mutex globals_lock;
IndirectReferenceTable globals;
// JNI weak global references.
Mutex weak_globals_lock;
IndirectReferenceTable weak_globals;
Mutex libraries_lock;
Libraries* libraries;
// Used by -Xcheck:jni.
const JNIInvokeInterface* unchecked_functions;
};
struct JNIEnvExt : public JNIEnv {
JNIEnvExt(Thread* self, JavaVMExt* vm);
~JNIEnvExt();
void DumpReferenceTables(std::ostream& os);
void SetCheckJniEnabled(bool enabled);
void PushFrame(int capacity);
void PopFrame();
static Offset SegmentStateOffset() {
return Offset(OFFSETOF_MEMBER(JNIEnvExt, locals) +
IndirectReferenceTable::SegmentStateOffset().Int32Value());
}
static Offset LocalRefCookieOffset() {
return Offset(OFFSETOF_MEMBER(JNIEnvExt, local_ref_cookie));
}
Thread* const self;
JavaVMExt* vm;
// Cookie used when using the local indirect reference table.
uint32_t local_ref_cookie;
// JNI local references.
IndirectReferenceTable locals;
// Stack of cookies corresponding to PushLocalFrame/PopLocalFrame calls.
// TODO: to avoid leaks (and bugs), we need to clear this vector on entry (or return)
// to a native method.
std::vector<uint32_t> stacked_local_ref_cookies;
// Frequently-accessed fields cached from JavaVM.
bool check_jni;
// How many nested "critical" JNI calls are we in?
int critical;
// Entered JNI monitors, for bulk exit on thread detach.
ReferenceTable monitors;
// Used by -Xcheck:jni.
const JNINativeInterface* unchecked_functions;
};
const JNINativeInterface* GetCheckJniNativeInterface();
const JNIInvokeInterface* GetCheckJniInvokeInterface();
// Used to save and restore the JNIEnvExt state when not going through code created by the JNI
// compiler
class ScopedJniEnvLocalRefState {
public:
explicit ScopedJniEnvLocalRefState(JNIEnvExt* env) : env_(env) {
saved_local_ref_cookie_ = env->local_ref_cookie;
env->local_ref_cookie = env->locals.GetSegmentState();
}
~ScopedJniEnvLocalRefState() {
env_->locals.SetSegmentState(env_->local_ref_cookie);
env_->local_ref_cookie = saved_local_ref_cookie_;
}
private:
JNIEnvExt* env_;
uint32_t saved_local_ref_cookie_;
DISALLOW_COPY_AND_ASSIGN(ScopedJniEnvLocalRefState);
};
} // namespace art
std::ostream& operator<<(std::ostream& os, const jobjectRefType& rhs);
#endif // ART_SRC_JNI_INTERNAL_H_