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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 "class_linker.h"
#include "jni_internal.h"
#include "object.h"
#include "object_utils.h"
#include "reflection.h"
#include "scoped_thread_state_change.h"
namespace art {
static bool GetFieldValue(const ScopedObjectAccess& soa, Object* o, Field* f,
JValue& value, bool allow_references)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
DCHECK_EQ(value.GetJ(), 0LL);
if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(f->GetDeclaringClass(),
true, true)) {
return false;
}
switch (FieldHelper(f).GetTypeAsPrimitiveType()) {
case Primitive::kPrimBoolean:
value.SetZ(f->GetBoolean(o));
return true;
case Primitive::kPrimByte:
value.SetB(f->GetByte(o));
return true;
case Primitive::kPrimChar:
value.SetC(f->GetChar(o));
return true;
case Primitive::kPrimDouble:
value.SetD(f->GetDouble(o));
return true;
case Primitive::kPrimFloat:
value.SetF(f->GetFloat(o));
return true;
case Primitive::kPrimInt:
value.SetI(f->GetInt(o));
return true;
case Primitive::kPrimLong:
value.SetJ(f->GetLong(o));
return true;
case Primitive::kPrimShort:
value.SetS(f->GetShort(o));
return true;
case Primitive::kPrimNot:
if (allow_references) {
value.SetL(f->GetObject(o));
return true;
}
// Else break to report an error.
break;
case Primitive::kPrimVoid:
// Never okay.
break;
}
soa.Self()->ThrowNewExceptionF("Ljava/lang/IllegalArgumentException;",
"Not a primitive field: %s", PrettyField(f).c_str());
return false;
}
static bool CheckReceiver(const ScopedObjectAccess& soa, jobject javaObj, Field* f,
Object*& o)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (f->IsStatic()) {
o = f->GetDeclaringClass();
return true;
}
o = soa.Decode<Object*>(javaObj);
Class* declaringClass = f->GetDeclaringClass();
if (!VerifyObjectInClass(o, declaringClass)) {
return false;
}
return true;
}
static jobject Field_get(JNIEnv* env, jobject javaField, jobject javaObj) {
ScopedObjectAccess soa(env);
Field* f = soa.DecodeField(env->FromReflectedField(javaField));
Object* o = NULL;
if (!CheckReceiver(soa, javaObj, f, o)) {
return NULL;
}
// Get the field's value, boxing if necessary.
JValue value;
if (!GetFieldValue(soa, o, f, value, true)) {
return NULL;
}
BoxPrimitive(FieldHelper(f).GetTypeAsPrimitiveType(), value);
return soa.AddLocalReference<jobject>(value.GetL());
}
static JValue GetPrimitiveField(JNIEnv* env, jobject javaField, jobject javaObj, char dst_descriptor) {
ScopedObjectAccess soa(env);
Field* f = soa.DecodeField(env->FromReflectedField(javaField));
Object* o = NULL;
if (!CheckReceiver(soa, javaObj, f, o)) {
return JValue();
}
// Read the value.
JValue field_value;
if (!GetFieldValue(soa, o, f, field_value, false)) {
return JValue();
}
// Widen it if necessary (and possible).
JValue wide_value;
Class* dst_type = Runtime::Current()->GetClassLinker()->FindPrimitiveClass(dst_descriptor);
if (!ConvertPrimitiveValue(FieldHelper(f).GetTypeAsPrimitiveType(), dst_type->GetPrimitiveType(),
field_value, wide_value)) {
return JValue();
}
return wide_value;
}
static jboolean Field_getBoolean(JNIEnv* env, jobject javaField, jobject javaObj) {
return GetPrimitiveField(env, javaField, javaObj, 'Z').GetZ();
}
static jbyte Field_getByte(JNIEnv* env, jobject javaField, jobject javaObj) {
return GetPrimitiveField(env, javaField, javaObj, 'B').GetB();
}
static jchar Field_getChar(JNIEnv* env, jobject javaField, jobject javaObj) {
return GetPrimitiveField(env, javaField, javaObj, 'C').GetC();
}
static jdouble Field_getDouble(JNIEnv* env, jobject javaField, jobject javaObj) {
return GetPrimitiveField(env, javaField, javaObj, 'D').GetD();
}
static jfloat Field_getFloat(JNIEnv* env, jobject javaField, jobject javaObj) {
return GetPrimitiveField(env, javaField, javaObj, 'F').GetF();
}
static jint Field_getInt(JNIEnv* env, jobject javaField, jobject javaObj) {
return GetPrimitiveField(env, javaField, javaObj, 'I').GetI();
}
static jlong Field_getLong(JNIEnv* env, jobject javaField, jobject javaObj) {
return GetPrimitiveField(env, javaField, javaObj, 'J').GetJ();
}
static jshort Field_getShort(JNIEnv* env, jobject javaField, jobject javaObj) {
return GetPrimitiveField(env, javaField, javaObj, 'S').GetS();
}
static void SetFieldValue(Object* o, Field* f, const JValue& new_value, bool allow_references)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(f->GetDeclaringClass(),
true, true)) {
return;
}
switch (FieldHelper(f).GetTypeAsPrimitiveType()) {
case Primitive::kPrimBoolean:
f->SetBoolean(o, new_value.GetZ());
break;
case Primitive::kPrimByte:
f->SetByte(o, new_value.GetB());
break;
case Primitive::kPrimChar:
f->SetChar(o, new_value.GetC());
break;
case Primitive::kPrimDouble:
f->SetDouble(o, new_value.GetD());
break;
case Primitive::kPrimFloat:
f->SetFloat(o, new_value.GetF());
break;
case Primitive::kPrimInt:
f->SetInt(o, new_value.GetI());
break;
case Primitive::kPrimLong:
f->SetLong(o, new_value.GetJ());
break;
case Primitive::kPrimShort:
f->SetShort(o, new_value.GetS());
break;
case Primitive::kPrimNot:
if (allow_references) {
f->SetObject(o, new_value.GetL());
break;
}
// Else fall through to report an error.
case Primitive::kPrimVoid:
// Never okay.
Thread::Current()->ThrowNewExceptionF("Ljava/lang/IllegalArgumentException;",
"Not a primitive field: %s", PrettyField(f).c_str());
return;
}
// Special handling for final fields on SMP systems.
// We need a store/store barrier here (JMM requirement).
if (f->IsFinal()) {
ANDROID_MEMBAR_STORE();
}
}
static void Field_set(JNIEnv* env, jobject javaField, jobject javaObj, jobject javaValue) {
ScopedObjectAccess soa(env);
Field* f = soa.DecodeField(env->FromReflectedField(javaField));
// Unbox the value, if necessary.
Object* boxed_value = soa.Decode<Object*>(javaValue);
JValue unboxed_value;
if (!UnboxPrimitiveForField(boxed_value, FieldHelper(f).GetType(), unboxed_value, f)) {
return;
}
// Check that the receiver is non-null and an instance of the field's declaring class.
Object* o = NULL;
if (!CheckReceiver(soa, javaObj, f, o)) {
return;
}
SetFieldValue(o, f, unboxed_value, true);
}
static void SetPrimitiveField(JNIEnv* env, jobject javaField, jobject javaObj, char src_descriptor,
const JValue& new_value) {
ScopedObjectAccess soa(env);
Field* f = soa.DecodeField(env->FromReflectedField(javaField));
Object* o = NULL;
if (!CheckReceiver(soa, javaObj, f, o)) {
return;
}
FieldHelper fh(f);
if (!fh.IsPrimitiveType()) {
soa.Self()->ThrowNewExceptionF("Ljava/lang/IllegalArgumentException;",
"Not a primitive field: %s", PrettyField(f).c_str());
return;
}
// Widen the value if necessary (and possible).
JValue wide_value;
Class* src_type = Runtime::Current()->GetClassLinker()->FindPrimitiveClass(src_descriptor);
if (!ConvertPrimitiveValue(src_type->GetPrimitiveType(), fh.GetTypeAsPrimitiveType(),
new_value, wide_value)) {
return;
}
// Write the value.
SetFieldValue(o, f, wide_value, false);
}
static void Field_setBoolean(JNIEnv* env, jobject javaField, jobject javaObj, jboolean z) {
JValue value;
value.SetZ(z);
SetPrimitiveField(env, javaField, javaObj, 'Z', value);
}
static void Field_setByte(JNIEnv* env, jobject javaField, jobject javaObj, jbyte b) {
JValue value;
value.SetB(b);
SetPrimitiveField(env, javaField, javaObj, 'B', value);
}
static void Field_setChar(JNIEnv* env, jobject javaField, jobject javaObj, jchar c) {
JValue value;
value.SetC(c);
SetPrimitiveField(env, javaField, javaObj, 'C', value);
}
static void Field_setDouble(JNIEnv* env, jobject javaField, jobject javaObj, jdouble d) {
JValue value;
value.SetD(d);
SetPrimitiveField(env, javaField, javaObj, 'D', value);
}
static void Field_setFloat(JNIEnv* env, jobject javaField, jobject javaObj, jfloat f) {
JValue value;
value.SetF(f);
SetPrimitiveField(env, javaField, javaObj, 'F', value);
}
static void Field_setInt(JNIEnv* env, jobject javaField, jobject javaObj, jint i) {
JValue value;
value.SetI(i);
SetPrimitiveField(env, javaField, javaObj, 'I', value);
}
static void Field_setLong(JNIEnv* env, jobject javaField, jobject javaObj, jlong j) {
JValue value;
value.SetJ(j);
SetPrimitiveField(env, javaField, javaObj, 'J', value);
}
static void Field_setShort(JNIEnv* env, jobject javaField, jobject javaObj, jshort s) {
JValue value;
value.SetS(s);
SetPrimitiveField(env, javaField, javaObj, 'S', value);
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(Field, get, "(Ljava/lang/Object;)Ljava/lang/Object;"),
NATIVE_METHOD(Field, getBoolean, "(Ljava/lang/Object;)Z"),
NATIVE_METHOD(Field, getByte, "(Ljava/lang/Object;)B"),
NATIVE_METHOD(Field, getChar, "(Ljava/lang/Object;)C"),
NATIVE_METHOD(Field, getDouble, "(Ljava/lang/Object;)D"),
NATIVE_METHOD(Field, getFloat, "(Ljava/lang/Object;)F"),
NATIVE_METHOD(Field, getInt, "(Ljava/lang/Object;)I"),
NATIVE_METHOD(Field, getLong, "(Ljava/lang/Object;)J"),
NATIVE_METHOD(Field, getShort, "(Ljava/lang/Object;)S"),
NATIVE_METHOD(Field, set, "(Ljava/lang/Object;Ljava/lang/Object;)V"),
NATIVE_METHOD(Field, setBoolean, "(Ljava/lang/Object;Z)V"),
NATIVE_METHOD(Field, setByte, "(Ljava/lang/Object;B)V"),
NATIVE_METHOD(Field, setChar, "(Ljava/lang/Object;C)V"),
NATIVE_METHOD(Field, setDouble, "(Ljava/lang/Object;D)V"),
NATIVE_METHOD(Field, setFloat, "(Ljava/lang/Object;F)V"),
NATIVE_METHOD(Field, setInt, "(Ljava/lang/Object;I)V"),
NATIVE_METHOD(Field, setLong, "(Ljava/lang/Object;J)V"),
NATIVE_METHOD(Field, setShort, "(Ljava/lang/Object;S)V"),
};
void register_java_lang_reflect_Field(JNIEnv* env) {
REGISTER_NATIVE_METHODS("java/lang/reflect/Field");
}
} // namespace art