426 lines
16 KiB
C++
426 lines
16 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "class_linker.h"
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#include "class_linker-inl.h"
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#include "common_throws.h"
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#include "dex_file-inl.h"
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#include "field_helper.h"
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#include "jni_internal.h"
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#include "mirror/art_field-inl.h"
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#include "mirror/art_method-inl.h"
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#include "mirror/class-inl.h"
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#include "reflection-inl.h"
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#include "scoped_fast_native_object_access.h"
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namespace art {
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template<bool kIsSet>
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ALWAYS_INLINE inline static bool VerifyFieldAccess(Thread* self, mirror::ArtField* field,
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mirror::Object* obj)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
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if (kIsSet && field->IsFinal()) {
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ThrowIllegalAccessException(nullptr, StringPrintf("Cannot set final field: %s",
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PrettyField(field).c_str()).c_str());
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return false;
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}
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if (!VerifyAccess(self, obj, field->GetDeclaringClass(), field->GetAccessFlags())) {
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ThrowIllegalAccessException(nullptr, StringPrintf("Cannot access field: %s",
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PrettyField(field).c_str()).c_str());
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return false;
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}
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return true;
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}
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template<bool kAllowReferences>
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ALWAYS_INLINE inline static bool GetFieldValue(
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const ScopedFastNativeObjectAccess& soa, mirror::Object* o, mirror::ArtField* f,
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Primitive::Type field_type, JValue* value)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
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DCHECK_EQ(value->GetJ(), INT64_C(0));
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switch (field_type) {
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case Primitive::kPrimBoolean:
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value->SetZ(f->GetBoolean(o));
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return true;
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case Primitive::kPrimByte:
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value->SetB(f->GetByte(o));
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return true;
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case Primitive::kPrimChar:
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value->SetC(f->GetChar(o));
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return true;
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case Primitive::kPrimDouble:
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value->SetD(f->GetDouble(o));
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return true;
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case Primitive::kPrimFloat:
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value->SetF(f->GetFloat(o));
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return true;
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case Primitive::kPrimInt:
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value->SetI(f->GetInt(o));
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return true;
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case Primitive::kPrimLong:
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value->SetJ(f->GetLong(o));
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return true;
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case Primitive::kPrimShort:
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value->SetS(f->GetShort(o));
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return true;
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case Primitive::kPrimNot:
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if (kAllowReferences) {
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value->SetL(f->GetObject(o));
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return true;
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}
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// Else break to report an error.
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break;
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case Primitive::kPrimVoid:
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// Never okay.
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break;
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}
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ThrowIllegalArgumentException(nullptr, StringPrintf("Not a primitive field: %s",
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PrettyField(f).c_str()).c_str());
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return false;
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}
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ALWAYS_INLINE inline static bool CheckReceiver(const ScopedFastNativeObjectAccess& soa,
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jobject j_rcvr, mirror::ArtField** f,
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mirror::Object** class_or_rcvr)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
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soa.Self()->AssertThreadSuspensionIsAllowable();
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mirror::Class* declaringClass = (*f)->GetDeclaringClass();
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if ((*f)->IsStatic()) {
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if (UNLIKELY(!declaringClass->IsInitialized())) {
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ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
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StackHandleScope<2> hs(soa.Self());
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HandleWrapper<mirror::ArtField> h_f(hs.NewHandleWrapper(f));
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HandleWrapper<mirror::Class> h_klass(hs.NewHandleWrapper(&declaringClass));
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if (UNLIKELY(!class_linker->EnsureInitialized(h_klass, true, true))) {
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DCHECK(soa.Self()->IsExceptionPending());
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return false;
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}
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}
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*class_or_rcvr = declaringClass;
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return true;
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}
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*class_or_rcvr = soa.Decode<mirror::Object*>(j_rcvr);
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if (!VerifyObjectIsClass(*class_or_rcvr, declaringClass)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return false;
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}
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return true;
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}
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static jobject Field_get(JNIEnv* env, jobject javaField, jobject javaObj, jboolean accessible) {
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ScopedFastNativeObjectAccess soa(env);
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mirror::ArtField* f = mirror::ArtField::FromReflectedField(soa, javaField);
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mirror::Object* o = nullptr;
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if (!CheckReceiver(soa, javaObj, &f, &o)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return nullptr;
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}
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// If field is not set to be accessible, verify it can be accessed by the caller.
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if ((accessible == JNI_FALSE) && !VerifyFieldAccess<false>(soa.Self(), f, o)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return nullptr;
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}
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// We now don't expect suspension unless an exception is thrown.
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// Get the field's value, boxing if necessary.
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Primitive::Type field_type = f->GetTypeAsPrimitiveType();
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JValue value;
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if (!GetFieldValue<true>(soa, o, f, field_type, &value)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return nullptr;
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}
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return soa.AddLocalReference<jobject>(BoxPrimitive(field_type, value));
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}
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template<Primitive::Type kPrimitiveType>
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ALWAYS_INLINE inline static JValue GetPrimitiveField(JNIEnv* env, jobject javaField,
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jobject javaObj, jboolean accessible) {
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ScopedFastNativeObjectAccess soa(env);
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mirror::ArtField* f = mirror::ArtField::FromReflectedField(soa, javaField);
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mirror::Object* o = nullptr;
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if (!CheckReceiver(soa, javaObj, &f, &o)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return JValue();
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}
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// If field is not set to be accessible, verify it can be accessed by the caller.
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if (accessible == JNI_FALSE && !VerifyFieldAccess<false>(soa.Self(), f, o)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return JValue();
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}
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// We now don't expect suspension unless an exception is thrown.
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// Read the value.
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Primitive::Type field_type = f->GetTypeAsPrimitiveType();
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JValue field_value;
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if (field_type == kPrimitiveType) {
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// This if statement should get optimized out since we only pass in valid primitive types.
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if (UNLIKELY(!GetFieldValue<false>(soa, o, f, kPrimitiveType, &field_value))) {
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DCHECK(soa.Self()->IsExceptionPending());
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return JValue();
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}
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return field_value;
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}
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if (!GetFieldValue<false>(soa, o, f, field_type, &field_value)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return JValue();
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}
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// Widen it if necessary (and possible).
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JValue wide_value;
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if (!ConvertPrimitiveValue(nullptr, false, field_type, kPrimitiveType, field_value,
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&wide_value)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return JValue();
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}
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return wide_value;
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}
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static jboolean Field_getBoolean(JNIEnv* env, jobject javaField, jobject javaObj,
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jboolean accessible) {
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return GetPrimitiveField<Primitive::kPrimBoolean>(env, javaField, javaObj, accessible).GetZ();
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}
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static jbyte Field_getByte(JNIEnv* env, jobject javaField, jobject javaObj, jboolean accessible) {
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return GetPrimitiveField<Primitive::kPrimByte>(env, javaField, javaObj, accessible).GetB();
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}
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static jchar Field_getChar(JNIEnv* env, jobject javaField, jobject javaObj, jboolean accessible) {
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return GetPrimitiveField<Primitive::kPrimChar>(env, javaField, javaObj, accessible).GetC();
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}
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static jdouble Field_getDouble(JNIEnv* env, jobject javaField, jobject javaObj,
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jboolean accessible) {
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return GetPrimitiveField<Primitive::kPrimDouble>(env, javaField, javaObj, accessible).GetD();
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}
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static jfloat Field_getFloat(JNIEnv* env, jobject javaField, jobject javaObj, jboolean accessible) {
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return GetPrimitiveField<Primitive::kPrimFloat>(env, javaField, javaObj, accessible).GetF();
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}
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static jint Field_getInt(JNIEnv* env, jobject javaField, jobject javaObj, jboolean accessible) {
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return GetPrimitiveField<Primitive::kPrimInt>(env, javaField, javaObj, accessible).GetI();
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}
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static jlong Field_getLong(JNIEnv* env, jobject javaField, jobject javaObj, jboolean accessible) {
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return GetPrimitiveField<Primitive::kPrimLong>(env, javaField, javaObj, accessible).GetJ();
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}
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static jshort Field_getShort(JNIEnv* env, jobject javaField, jobject javaObj, jboolean accessible) {
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return GetPrimitiveField<Primitive::kPrimShort>(env, javaField, javaObj, accessible).GetS();
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}
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static void SetFieldValue(ScopedFastNativeObjectAccess& soa, mirror::Object* o,
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mirror::ArtField* f, Primitive::Type field_type, bool allow_references,
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const JValue& new_value)
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SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
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DCHECK(f->GetDeclaringClass()->IsInitialized());
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switch (field_type) {
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case Primitive::kPrimBoolean:
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f->SetBoolean<false>(o, new_value.GetZ());
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break;
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case Primitive::kPrimByte:
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f->SetByte<false>(o, new_value.GetB());
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break;
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case Primitive::kPrimChar:
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f->SetChar<false>(o, new_value.GetC());
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break;
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case Primitive::kPrimDouble:
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f->SetDouble<false>(o, new_value.GetD());
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break;
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case Primitive::kPrimFloat:
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f->SetFloat<false>(o, new_value.GetF());
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break;
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case Primitive::kPrimInt:
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f->SetInt<false>(o, new_value.GetI());
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break;
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case Primitive::kPrimLong:
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f->SetLong<false>(o, new_value.GetJ());
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break;
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case Primitive::kPrimShort:
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f->SetShort<false>(o, new_value.GetS());
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break;
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case Primitive::kPrimNot:
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if (allow_references) {
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f->SetObject<false>(o, new_value.GetL());
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break;
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}
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// Else fall through to report an error.
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case Primitive::kPrimVoid:
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// Never okay.
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ThrowIllegalArgumentException(nullptr, StringPrintf("Not a primitive field: %s",
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PrettyField(f).c_str()).c_str());
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return;
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}
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}
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static void Field_set(JNIEnv* env, jobject javaField, jobject javaObj, jobject javaValue,
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jboolean accessible) {
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ScopedFastNativeObjectAccess soa(env);
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mirror::ArtField* f = mirror::ArtField::FromReflectedField(soa, javaField);
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// Check that the receiver is non-null and an instance of the field's declaring class.
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mirror::Object* o = nullptr;
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if (!CheckReceiver(soa, javaObj, &f, &o)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return;
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}
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mirror::Class* field_type;
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const char* field_type_desciptor = f->GetTypeDescriptor();
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Primitive::Type field_prim_type = Primitive::GetType(field_type_desciptor[0]);
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if (field_prim_type == Primitive::kPrimNot) {
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StackHandleScope<2> hs(soa.Self());
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HandleWrapper<mirror::Object> h_o(hs.NewHandleWrapper(&o));
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HandleWrapper<mirror::ArtField> h_f(hs.NewHandleWrapper(&f));
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FieldHelper fh(h_f);
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// May cause resolution.
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field_type = fh.GetType(true);
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if (field_type == nullptr) {
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DCHECK(soa.Self()->IsExceptionPending());
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return;
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}
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} else {
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field_type = Runtime::Current()->GetClassLinker()->FindPrimitiveClass(field_type_desciptor[0]);
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}
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// We now don't expect suspension unless an exception is thrown.
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// Unbox the value, if necessary.
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mirror::Object* boxed_value = soa.Decode<mirror::Object*>(javaValue);
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JValue unboxed_value;
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if (!UnboxPrimitiveForField(boxed_value, field_type, f, &unboxed_value)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return;
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}
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// If field is not set to be accessible, verify it can be accessed by the caller.
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if ((accessible == JNI_FALSE) && !VerifyFieldAccess<true>(soa.Self(), f, o)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return;
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}
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SetFieldValue(soa, o, f, field_prim_type, true, unboxed_value);
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}
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template<Primitive::Type kPrimitiveType>
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static void SetPrimitiveField(JNIEnv* env, jobject javaField, jobject javaObj,
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const JValue& new_value, jboolean accessible) {
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ScopedFastNativeObjectAccess soa(env);
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mirror::ArtField* f = mirror::ArtField::FromReflectedField(soa, javaField);
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mirror::Object* o = nullptr;
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if (!CheckReceiver(soa, javaObj, &f, &o)) {
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return;
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}
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Primitive::Type field_type = f->GetTypeAsPrimitiveType();
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if (UNLIKELY(field_type == Primitive::kPrimNot)) {
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ThrowIllegalArgumentException(nullptr, StringPrintf("Not a primitive field: %s",
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PrettyField(f).c_str()).c_str());
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return;
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}
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// Widen the value if necessary (and possible).
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JValue wide_value;
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if (!ConvertPrimitiveValue(nullptr, false, kPrimitiveType, field_type, new_value, &wide_value)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return;
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}
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// If field is not set to be accessible, verify it can be accessed by the caller.
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if ((accessible == JNI_FALSE) && !VerifyFieldAccess<true>(soa.Self(), f, o)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return;
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}
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// Write the value.
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SetFieldValue(soa, o, f, field_type, false, wide_value);
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}
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static void Field_setBoolean(JNIEnv* env, jobject javaField, jobject javaObj, jboolean z,
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jboolean accessible) {
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JValue value;
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value.SetZ(z);
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SetPrimitiveField<Primitive::kPrimBoolean>(env, javaField, javaObj, value, accessible);
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}
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static void Field_setByte(JNIEnv* env, jobject javaField, jobject javaObj, jbyte b,
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jboolean accessible) {
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JValue value;
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value.SetB(b);
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SetPrimitiveField<Primitive::kPrimByte>(env, javaField, javaObj, value, accessible);
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}
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static void Field_setChar(JNIEnv* env, jobject javaField, jobject javaObj, jchar c,
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jboolean accessible) {
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JValue value;
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value.SetC(c);
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SetPrimitiveField<Primitive::kPrimChar>(env, javaField, javaObj, value, accessible);
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}
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static void Field_setDouble(JNIEnv* env, jobject javaField, jobject javaObj, jdouble d,
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jboolean accessible) {
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JValue value;
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value.SetD(d);
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SetPrimitiveField<Primitive::kPrimDouble>(env, javaField, javaObj, value, accessible);
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}
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static void Field_setFloat(JNIEnv* env, jobject javaField, jobject javaObj, jfloat f,
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jboolean accessible) {
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JValue value;
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value.SetF(f);
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SetPrimitiveField<Primitive::kPrimFloat>(env, javaField, javaObj, value, accessible);
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}
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static void Field_setInt(JNIEnv* env, jobject javaField, jobject javaObj, jint i,
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jboolean accessible) {
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JValue value;
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value.SetI(i);
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SetPrimitiveField<Primitive::kPrimInt>(env, javaField, javaObj, value, accessible);
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}
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static void Field_setLong(JNIEnv* env, jobject javaField, jobject javaObj, jlong j,
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jboolean accessible) {
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JValue value;
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value.SetJ(j);
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SetPrimitiveField<Primitive::kPrimLong>(env, javaField, javaObj, value, accessible);
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}
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static void Field_setShort(JNIEnv* env, jobject javaField, jobject javaObj, jshort s,
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jboolean accessible) {
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JValue value;
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value.SetS(s);
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SetPrimitiveField<Primitive::kPrimShort>(env, javaField, javaObj, value, accessible);
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}
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static JNINativeMethod gMethods[] = {
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NATIVE_METHOD(Field, get, "!(Ljava/lang/Object;Z)Ljava/lang/Object;"),
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NATIVE_METHOD(Field, getBoolean, "!(Ljava/lang/Object;Z)Z"),
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NATIVE_METHOD(Field, getByte, "!(Ljava/lang/Object;Z)B"),
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NATIVE_METHOD(Field, getChar, "!(Ljava/lang/Object;Z)C"),
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NATIVE_METHOD(Field, getDouble, "!(Ljava/lang/Object;Z)D"),
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NATIVE_METHOD(Field, getFloat, "!(Ljava/lang/Object;Z)F"),
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NATIVE_METHOD(Field, getInt, "!(Ljava/lang/Object;Z)I"),
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NATIVE_METHOD(Field, getLong, "!(Ljava/lang/Object;Z)J"),
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NATIVE_METHOD(Field, getShort, "!(Ljava/lang/Object;Z)S"),
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NATIVE_METHOD(Field, set, "!(Ljava/lang/Object;Ljava/lang/Object;Z)V"),
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NATIVE_METHOD(Field, setBoolean, "!(Ljava/lang/Object;ZZ)V"),
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NATIVE_METHOD(Field, setByte, "!(Ljava/lang/Object;BZ)V"),
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NATIVE_METHOD(Field, setChar, "!(Ljava/lang/Object;CZ)V"),
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NATIVE_METHOD(Field, setDouble, "!(Ljava/lang/Object;DZ)V"),
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NATIVE_METHOD(Field, setFloat, "!(Ljava/lang/Object;FZ)V"),
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NATIVE_METHOD(Field, setInt, "!(Ljava/lang/Object;IZ)V"),
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NATIVE_METHOD(Field, setLong, "!(Ljava/lang/Object;JZ)V"),
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NATIVE_METHOD(Field, setShort, "!(Ljava/lang/Object;SZ)V"),
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};
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void register_java_lang_reflect_Field(JNIEnv* env) {
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REGISTER_NATIVE_METHODS("java/lang/reflect/Field");
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}
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} // namespace art
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