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/*
* Copyright (C) 2008 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 "jni_internal.h"
#include "object.h"
#include "JniConstants.h" // Last to avoid problems with LOG redefinition.
namespace art {
namespace {
jlong Unsafe_objectFieldOffset0(JNIEnv* env, jclass, jobject javaField) {
jfieldID fid = env->FromReflectedField(javaField);
Field* field = DecodeField(fid);
return field->GetOffset().Int32Value();
}
jint Unsafe_arrayBaseOffset0(JNIEnv*, jclass, jclass) {
return Array::DataOffset().Int32Value();
}
jint Unsafe_arrayIndexScale0(JNIEnv* env, jclass, jclass javaClass) {
Class* c = Decode<Class*>(env, javaClass);
return c->GetComponentSize();
}
jboolean Unsafe_compareAndSwapInt(JNIEnv* env, jobject, jobject javaObj, jlong offset, jint expectedValue, jint newValue) {
Object* obj = Decode<Object*>(env, javaObj);
byte* raw_addr = reinterpret_cast<byte*>(obj) + offset;
volatile int32_t* address = reinterpret_cast<volatile int32_t*>(raw_addr);
// Note: android_atomic_release_cas() returns 0 on success, not failure.
int result = android_atomic_release_cas(expectedValue, newValue, address);
return (result == 0);
}
jboolean Unsafe_compareAndSwapLong(JNIEnv* env, jobject, jobject javaObj, jlong offset, jlong expectedValue, jlong newValue) {
Object* obj = Decode<Object*>(env, javaObj);
byte* raw_addr = reinterpret_cast<byte*>(obj) + offset;
volatile int64_t* address = reinterpret_cast<volatile int64_t*>(raw_addr);
// Note: android_atomic_cmpxchg() returns 0 on success, not failure.
int result = QuasiAtomicCas64(expectedValue, newValue, address);
return (result == 0);
}
jboolean Unsafe_compareAndSwapObject(JNIEnv* env, jobject, jobject javaObj, jlong offset, jobject javaExpectedValue, jobject javaNewValue) {
Object* obj = Decode<Object*>(env, javaObj);
Object* expectedValue = Decode<Object*>(env, javaExpectedValue);
Object* newValue = Decode<Object*>(env, javaNewValue);
byte* raw_addr = reinterpret_cast<byte*>(obj) + offset;
int32_t* address = reinterpret_cast<int32_t*>(raw_addr);
// Note: android_atomic_cmpxchg() returns 0 on success, not failure.
int result = android_atomic_release_cas(reinterpret_cast<int32_t>(expectedValue),
reinterpret_cast<int32_t>(newValue), address);
if (result == 0) {
Heap::WriteBarrierField(obj, MemberOffset(offset), newValue);
}
return (result == 0);
}
jint Unsafe_getInt(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
Object* obj = Decode<Object*>(env, javaObj);
return obj->GetField32(MemberOffset(offset), false);
}
jint Unsafe_getIntVolatile(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
Object* obj = Decode<Object*>(env, javaObj);
byte* raw_addr = reinterpret_cast<byte*>(obj) + offset;
volatile int32_t* address = reinterpret_cast<volatile int32_t*>(raw_addr);
return android_atomic_acquire_load(address);
}
void Unsafe_putInt(JNIEnv* env, jobject, jobject javaObj, jlong offset, jint newValue) {
Object* obj = Decode<Object*>(env, javaObj);
obj->SetField32(MemberOffset(offset), newValue, false);
}
void Unsafe_putIntVolatile(JNIEnv* env, jobject, jobject javaObj, jlong offset, jint newValue) {
Object* obj = Decode<Object*>(env, javaObj);
byte* raw_addr = reinterpret_cast<byte*>(obj) + offset;
volatile int32_t* address = reinterpret_cast<volatile int32_t*>(raw_addr);
android_atomic_release_store(newValue, address);
}
void Unsafe_putOrderedInt(JNIEnv* env, jobject, jobject javaObj, jlong offset, jint newValue) {
Object* obj = Decode<Object*>(env, javaObj);
ANDROID_MEMBAR_STORE();
obj->SetField32(MemberOffset(offset), newValue, false);
}
jlong Unsafe_getLong(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
Object* obj = Decode<Object*>(env, javaObj);
byte* raw_addr = reinterpret_cast<byte*>(obj) + offset;
int64_t* address = reinterpret_cast<int64_t*>(raw_addr);
return *address;
}
jlong Unsafe_getLongVolatile(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
Object* obj = Decode<Object*>(env, javaObj);
return obj->GetField64(MemberOffset(offset), true);
}
void Unsafe_putLong(JNIEnv* env, jobject, jobject javaObj, jlong offset, jlong newValue) {
Object* obj = Decode<Object*>(env, javaObj);
obj->SetField64(MemberOffset(offset), newValue, false);
}
void Unsafe_putLongVolatile(JNIEnv* env, jobject, jobject javaObj, jlong offset, jlong newValue) {
Object* obj = Decode<Object*>(env, javaObj);
obj->SetField64(MemberOffset(offset), newValue, true);
}
void Unsafe_putOrderedLong(JNIEnv* env, jobject, jobject javaObj, jlong offset, jlong newValue) {
Object* obj = Decode<Object*>(env, javaObj);
ANDROID_MEMBAR_STORE();
obj->SetField64(MemberOffset(offset), newValue, false);
}
jobject Unsafe_getObjectVolatile(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
Object* obj = Decode<Object*>(env, javaObj);
Object* value = obj->GetFieldObject<Object*>(MemberOffset(offset), true);
return AddLocalReference<jobject>(env, value);
}
jobject Unsafe_getObject(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
Object* obj = Decode<Object*>(env, javaObj);
Object* value = obj->GetFieldObject<Object*>(MemberOffset(offset), false);
return AddLocalReference<jobject>(env, value);
}
void Unsafe_putObject(JNIEnv* env, jobject, jobject javaObj, jlong offset, jobject javaNewValue) {
Object* obj = Decode<Object*>(env, javaObj);
Object* newValue = Decode<Object*>(env, javaNewValue);
obj->SetFieldObject(MemberOffset(offset), newValue, false);
}
void Unsafe_putObjectVolatile(JNIEnv* env, jobject, jobject javaObj, jlong offset, jobject javaNewValue) {
Object* obj = Decode<Object*>(env, javaObj);
Object* newValue = Decode<Object*>(env, javaNewValue);
obj->SetFieldObject(MemberOffset(offset), newValue, true);
}
void Unsafe_putOrderedObject(JNIEnv* env, jobject, jobject javaObj, jlong offset, jobject javaNewValue) {
Object* obj = Decode<Object*>(env, javaObj);
Object* newValue = Decode<Object*>(env, javaNewValue);
ANDROID_MEMBAR_STORE();
obj->SetFieldObject(MemberOffset(offset), newValue, false);
}
JNINativeMethod gMethods[] = {
NATIVE_METHOD(Unsafe, objectFieldOffset0, "(Ljava/lang/reflect/Field;)J"),
NATIVE_METHOD(Unsafe, arrayBaseOffset0, "(Ljava/lang/Class;)I"),
NATIVE_METHOD(Unsafe, arrayIndexScale0, "(Ljava/lang/Class;)I"),
NATIVE_METHOD(Unsafe, compareAndSwapInt, "(Ljava/lang/Object;JII)Z"),
NATIVE_METHOD(Unsafe, compareAndSwapLong, "(Ljava/lang/Object;JJJ)Z"),
NATIVE_METHOD(Unsafe, compareAndSwapObject, "(Ljava/lang/Object;JLjava/lang/Object;Ljava/lang/Object;)Z"),
NATIVE_METHOD(Unsafe, getIntVolatile, "(Ljava/lang/Object;J)I"),
NATIVE_METHOD(Unsafe, putIntVolatile, "(Ljava/lang/Object;JI)V"),
NATIVE_METHOD(Unsafe, getLongVolatile, "(Ljava/lang/Object;J)J"),
NATIVE_METHOD(Unsafe, putLongVolatile, "(Ljava/lang/Object;JJ)V"),
NATIVE_METHOD(Unsafe, getObjectVolatile, "(Ljava/lang/Object;J)Ljava/lang/Object;"),
NATIVE_METHOD(Unsafe, putObjectVolatile, "(Ljava/lang/Object;JLjava/lang/Object;)V"),
NATIVE_METHOD(Unsafe, getInt, "(Ljava/lang/Object;J)I"),
NATIVE_METHOD(Unsafe, putInt, "(Ljava/lang/Object;JI)V"),
NATIVE_METHOD(Unsafe, putOrderedInt, "(Ljava/lang/Object;JI)V"),
NATIVE_METHOD(Unsafe, getLong, "(Ljava/lang/Object;J)J"),
NATIVE_METHOD(Unsafe, putLong, "(Ljava/lang/Object;JJ)V"),
NATIVE_METHOD(Unsafe, putOrderedLong, "(Ljava/lang/Object;JJ)V"),
NATIVE_METHOD(Unsafe, getObject, "(Ljava/lang/Object;J)Ljava/lang/Object;"),
NATIVE_METHOD(Unsafe, putObject, "(Ljava/lang/Object;JLjava/lang/Object;)V"),
NATIVE_METHOD(Unsafe, putOrderedObject, "(Ljava/lang/Object;JLjava/lang/Object;)V"),
};
} // namespace
void register_sun_misc_Unsafe(JNIEnv* env) {
jniRegisterNativeMethods(env, "sun/misc/Unsafe", gMethods, NELEM(gMethods));
}
} // namespace art
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