1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*
* 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 {
static jlong Unsafe_objectFieldOffset0(JNIEnv* env, jclass, jobject javaField) {
// TODO: move to Java code
jfieldID fid = env->FromReflectedField(javaField);
Field* field = DecodeField(fid);
return field->GetOffset().Int32Value();
}
static jint Unsafe_arrayBaseOffset0(JNIEnv* env, jclass, jclass javaArrayClass) {
// TODO: move to Java code
ScopedThreadStateChange tsc(Thread::Current(), Thread::kRunnable);
Class* array_class = Decode<Class*>(env, javaArrayClass);
return Array::DataOffset(array_class->GetComponentSize()).Int32Value();
}
static jint Unsafe_arrayIndexScale0(JNIEnv* env, jclass, jclass javaClass) {
Class* c = Decode<Class*>(env, javaClass);
return c->GetComponentSize();
}
static 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);
}
static 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);
}
static 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) {
Runtime::Current()->GetHeap()->WriteBarrierField(obj, MemberOffset(offset), newValue);
}
return (result == 0);
}
static jint Unsafe_getInt(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
Object* obj = Decode<Object*>(env, javaObj);
return obj->GetField32(MemberOffset(offset), false);
}
static 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);
}
static void Unsafe_putInt(JNIEnv* env, jobject, jobject javaObj, jlong offset, jint newValue) {
Object* obj = Decode<Object*>(env, javaObj);
obj->SetField32(MemberOffset(offset), newValue, false);
}
static 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);
}
static 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);
}
static 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;
}
static jlong Unsafe_getLongVolatile(JNIEnv* env, jobject, jobject javaObj, jlong offset) {
Object* obj = Decode<Object*>(env, javaObj);
return obj->GetField64(MemberOffset(offset), true);
}
static void Unsafe_putLong(JNIEnv* env, jobject, jobject javaObj, jlong offset, jlong newValue) {
Object* obj = Decode<Object*>(env, javaObj);
obj->SetField64(MemberOffset(offset), newValue, false);
}
static void Unsafe_putLongVolatile(JNIEnv* env, jobject, jobject javaObj, jlong offset, jlong newValue) {
Object* obj = Decode<Object*>(env, javaObj);
obj->SetField64(MemberOffset(offset), newValue, true);
}
static 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);
}
static 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);
}
static 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);
}
static 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);
}
static 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);
}
static 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);
}
static 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"),
};
void register_sun_misc_Unsafe(JNIEnv* env) {
jniRegisterNativeMethods(env, "sun/misc/Unsafe", gMethods, NELEM(gMethods));
}
} // namespace art
|
