/*
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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 "java_lang_reflect_Field.h"
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#include "android-base/stringprintf.h"
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#include "nativehelper/jni_macros.h"
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#include "art_field-inl.h"
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#include "base/utils.h"
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#include "class_linker-inl.h"
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#include "class_linker.h"
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#include "common_throws.h"
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#include "dex/dex_file-inl.h"
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#include "dex/dex_file_annotations.h"
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#include "jni/jni_internal.h"
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#include "jvalue-inl.h"
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#include "mirror/class-inl.h"
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#include "mirror/field-inl.h"
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#include "mirror/object_array-alloc-inl.h"
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#include "native_util.h"
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#include "reflection-inl.h"
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#include "scoped_fast_native_object_access-inl.h"
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#include "well_known_classes.h"
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namespace art {
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using android::base::StringPrintf;
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template<bool kIsSet>
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ALWAYS_INLINE inline static bool VerifyFieldAccess(Thread* self,
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ObjPtr<mirror::Field> field,
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ObjPtr<mirror::Object> obj)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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if (kIsSet && field->IsFinal()) {
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ThrowIllegalAccessException(
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StringPrintf("Cannot set %s field %s of class %s",
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PrettyJavaAccessFlags(field->GetAccessFlags()).c_str(),
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ArtField::PrettyField(field->GetArtField()).c_str(),
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field->GetDeclaringClass() == nullptr ? "null" :
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field->GetDeclaringClass()->PrettyClass().c_str()).c_str());
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return false;
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}
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ObjPtr<mirror::Class> calling_class;
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if (!VerifyAccess(self,
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obj,
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field->GetDeclaringClass(),
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field->GetAccessFlags(),
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&calling_class,
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1)) {
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ThrowIllegalAccessException(
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StringPrintf("Class %s cannot access %s field %s of class %s",
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calling_class == nullptr ? "null" : calling_class->PrettyClass().c_str(),
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PrettyJavaAccessFlags(field->GetAccessFlags()).c_str(),
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ArtField::PrettyField(field->GetArtField()).c_str(),
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field->GetDeclaringClass() == nullptr ? "null" :
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field->GetDeclaringClass()->PrettyClass().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(ObjPtr<mirror::Object> o,
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ObjPtr<mirror::Field> f,
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Primitive::Type field_type,
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JValue* value)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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DCHECK_EQ(value->GetJ(), INT64_C(0));
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MemberOffset offset(f->GetOffset());
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const bool is_volatile = f->IsVolatile();
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switch (field_type) {
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case Primitive::kPrimBoolean:
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value->SetZ(is_volatile ? o->GetFieldBooleanVolatile(offset) : o->GetFieldBoolean(offset));
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return true;
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case Primitive::kPrimByte:
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value->SetB(is_volatile ? o->GetFieldByteVolatile(offset) : o->GetFieldByte(offset));
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return true;
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case Primitive::kPrimChar:
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value->SetC(is_volatile ? o->GetFieldCharVolatile(offset) : o->GetFieldChar(offset));
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return true;
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case Primitive::kPrimInt:
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case Primitive::kPrimFloat:
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value->SetI(is_volatile ? o->GetField32Volatile(offset) : o->GetField32(offset));
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return true;
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case Primitive::kPrimLong:
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case Primitive::kPrimDouble:
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value->SetJ(is_volatile ? o->GetField64Volatile(offset) : o->GetField64(offset));
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return true;
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case Primitive::kPrimShort:
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value->SetS(is_volatile ? o->GetFieldShortVolatile(offset) : o->GetFieldShort(offset));
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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(is_volatile ? o->GetFieldObjectVolatile<mirror::Object>(offset) :
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o->GetFieldObject<mirror::Object>(offset));
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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(
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StringPrintf("Not a primitive field: %s",
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ArtField::PrettyField(f->GetArtField()).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,
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ObjPtr<mirror::Field>* f,
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ObjPtr<mirror::Object>* class_or_rcvr)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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soa.Self()->AssertThreadSuspensionIsAllowable();
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ObjPtr<mirror::Class> declaring_class = (*f)->GetDeclaringClass();
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if ((*f)->IsStatic()) {
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if (UNLIKELY(!declaring_class->IsInitialized())) {
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StackHandleScope<2> hs(soa.Self());
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HandleWrapperObjPtr<mirror::Field> h_f(hs.NewHandleWrapper(f));
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HandleWrapperObjPtr<mirror::Class> h_klass(hs.NewHandleWrapper(&declaring_class));
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ClassLinker* const class_linker = Runtime::Current()->GetClassLinker();
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if (UNLIKELY(!class_linker->EnsureInitialized(soa.Self(), 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 = declaring_class;
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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, declaring_class)) {
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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) {
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ScopedFastNativeObjectAccess soa(env);
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ObjPtr<mirror::Field> f = soa.Decode<mirror::Field>(javaField);
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ObjPtr<mirror::Object> o;
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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 (!f->IsAccessible() && !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>(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,
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jobject javaField,
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jobject javaObj) {
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ScopedFastNativeObjectAccess soa(env);
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ObjPtr<mirror::Field> f = soa.Decode<mirror::Field>(javaField);
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ObjPtr<mirror::Object> o;
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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 (!f->IsAccessible() && !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>(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>(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(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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return GetPrimitiveField<Primitive::kPrimBoolean>(env, javaField, javaObj).GetZ();
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}
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static jbyte Field_getByte(JNIEnv* env, jobject javaField, jobject javaObj) {
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return GetPrimitiveField<Primitive::kPrimByte>(env, javaField, javaObj).GetB();
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}
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static jchar Field_getChar(JNIEnv* env, jobject javaField, jobject javaObj) {
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return GetPrimitiveField<Primitive::kPrimChar>(env, javaField, javaObj).GetC();
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}
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static jdouble Field_getDouble(JNIEnv* env, jobject javaField, jobject javaObj) {
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return GetPrimitiveField<Primitive::kPrimDouble>(env, javaField, javaObj).GetD();
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}
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static jfloat Field_getFloat(JNIEnv* env, jobject javaField, jobject javaObj) {
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return GetPrimitiveField<Primitive::kPrimFloat>(env, javaField, javaObj).GetF();
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}
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static jint Field_getInt(JNIEnv* env, jobject javaField, jobject javaObj) {
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return GetPrimitiveField<Primitive::kPrimInt>(env, javaField, javaObj).GetI();
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}
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static jlong Field_getLong(JNIEnv* env, jobject javaField, jobject javaObj) {
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return GetPrimitiveField<Primitive::kPrimLong>(env, javaField, javaObj).GetJ();
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}
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static jshort Field_getShort(JNIEnv* env, jobject javaField, jobject javaObj) {
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return GetPrimitiveField<Primitive::kPrimShort>(env, javaField, javaObj).GetS();
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}
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ALWAYS_INLINE inline static void SetFieldValue(ObjPtr<mirror::Object> o,
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ObjPtr<mirror::Field> f,
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Primitive::Type field_type,
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bool allow_references,
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const JValue& new_value)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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DCHECK(f->GetDeclaringClass()->IsInitialized());
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MemberOffset offset(f->GetOffset());
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const bool is_volatile = f->IsVolatile();
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switch (field_type) {
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case Primitive::kPrimBoolean:
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if (is_volatile) {
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o->SetFieldBooleanVolatile<false>(offset, new_value.GetZ());
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} else {
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o->SetFieldBoolean<false>(offset, new_value.GetZ());
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}
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break;
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case Primitive::kPrimByte:
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if (is_volatile) {
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o->SetFieldBooleanVolatile<false>(offset, new_value.GetB());
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} else {
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o->SetFieldBoolean<false>(offset, new_value.GetB());
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}
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break;
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case Primitive::kPrimChar:
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if (is_volatile) {
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o->SetFieldCharVolatile<false>(offset, new_value.GetC());
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} else {
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o->SetFieldChar<false>(offset, new_value.GetC());
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}
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break;
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case Primitive::kPrimInt:
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case Primitive::kPrimFloat:
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if (is_volatile) {
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o->SetField32Volatile<false>(offset, new_value.GetI());
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} else {
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o->SetField32<false>(offset, new_value.GetI());
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}
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break;
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case Primitive::kPrimLong:
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case Primitive::kPrimDouble:
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if (is_volatile) {
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o->SetField64Volatile<false>(offset, new_value.GetJ());
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} else {
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o->SetField64<false>(offset, new_value.GetJ());
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}
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break;
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case Primitive::kPrimShort:
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if (is_volatile) {
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o->SetFieldShortVolatile<false>(offset, new_value.GetS());
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} else {
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o->SetFieldShort<false>(offset, new_value.GetS());
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}
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break;
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case Primitive::kPrimNot:
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if (allow_references) {
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if (is_volatile) {
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o->SetFieldObjectVolatile<false>(offset, new_value.GetL());
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} else {
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o->SetFieldObject<false>(offset, new_value.GetL());
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}
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break;
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}
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// Else fall through to report an error.
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FALLTHROUGH_INTENDED;
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case Primitive::kPrimVoid:
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// Never okay.
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ThrowIllegalArgumentException(
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StringPrintf("Not a primitive field: %s",
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ArtField::PrettyField(f->GetArtField()).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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ScopedFastNativeObjectAccess soa(env);
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ObjPtr<mirror::Field> f = soa.Decode<mirror::Field>(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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ObjPtr<mirror::Object> o;
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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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ObjPtr<mirror::Class> field_type;
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const char* field_type_descriptor = f->GetArtField()->GetTypeDescriptor();
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Primitive::Type field_prim_type = Primitive::GetType(field_type_descriptor[0]);
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if (field_prim_type == Primitive::kPrimNot) {
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field_type = f->GetType();
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} else {
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field_type =
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Runtime::Current()->GetClassLinker()->LookupPrimitiveClass(field_type_descriptor[0]);
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}
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DCHECK(field_type != nullptr) << field_type_descriptor;
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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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ObjPtr<mirror::Object> boxed_value = soa.Decode<mirror::Object>(javaValue);
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JValue unboxed_value;
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if (!UnboxPrimitiveForField(boxed_value,
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field_type,
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f->GetArtField(),
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&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 (!f->IsAccessible() && !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(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,
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jobject javaField,
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jobject javaObj,
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const JValue& new_value) {
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ScopedFastNativeObjectAccess soa(env);
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ObjPtr<mirror::Field> f = soa.Decode<mirror::Field>(javaField);
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ObjPtr<mirror::Object> o;
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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(
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StringPrintf("Not a primitive field: %s",
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ArtField::PrettyField(f->GetArtField()).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(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 (!f->IsAccessible() && !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(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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JValue value;
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value.SetZ(z);
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SetPrimitiveField<Primitive::kPrimBoolean>(env, javaField, javaObj, value);
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}
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static void Field_setByte(JNIEnv* env, jobject javaField, jobject javaObj, jbyte b) {
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JValue value;
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value.SetB(b);
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SetPrimitiveField<Primitive::kPrimByte>(env, javaField, javaObj, value);
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}
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static void Field_setChar(JNIEnv* env, jobject javaField, jobject javaObj, jchar c) {
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JValue value;
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value.SetC(c);
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SetPrimitiveField<Primitive::kPrimChar>(env, javaField, javaObj, value);
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}
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static void Field_setDouble(JNIEnv* env, jobject javaField, jobject javaObj, jdouble d) {
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JValue value;
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value.SetD(d);
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SetPrimitiveField<Primitive::kPrimDouble>(env, javaField, javaObj, value);
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}
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static void Field_setFloat(JNIEnv* env, jobject javaField, jobject javaObj, jfloat f) {
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JValue value;
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value.SetF(f);
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SetPrimitiveField<Primitive::kPrimFloat>(env, javaField, javaObj, value);
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}
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static void Field_setInt(JNIEnv* env, jobject javaField, jobject javaObj, jint i) {
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JValue value;
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value.SetI(i);
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SetPrimitiveField<Primitive::kPrimInt>(env, javaField, javaObj, value);
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}
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static void Field_setLong(JNIEnv* env, jobject javaField, jobject javaObj, jlong j) {
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JValue value;
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value.SetJ(j);
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SetPrimitiveField<Primitive::kPrimLong>(env, javaField, javaObj, value);
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}
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static void Field_setShort(JNIEnv* env, jobject javaField, jobject javaObj, jshort s) {
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JValue value;
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value.SetS(s);
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SetPrimitiveField<Primitive::kPrimShort>(env, javaField, javaObj, value);
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}
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static jobject Field_getAnnotationNative(JNIEnv* env, jobject javaField, jclass annotationType) {
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ScopedFastNativeObjectAccess soa(env);
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StackHandleScope<1> hs(soa.Self());
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ArtField* field = soa.Decode<mirror::Field>(javaField)->GetArtField();
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if (field->GetDeclaringClass()->IsProxyClass()) {
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return nullptr;
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}
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Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class>(annotationType)));
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return soa.AddLocalReference<jobject>(annotations::GetAnnotationForField(field, klass));
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}
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static jlong Field_getArtField(JNIEnv* env, jobject javaField) {
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ScopedFastNativeObjectAccess soa(env);
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ArtField* field = soa.Decode<mirror::Field>(javaField)->GetArtField();
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return reinterpret_cast<jlong>(field);
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}
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static jstring Field_getNameInternal(JNIEnv* env, jobject javaField) {
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ScopedFastNativeObjectAccess soa(env);
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ArtField* field = soa.Decode<mirror::Field>(javaField)->GetArtField();
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return soa.AddLocalReference<jstring>(field->ResolveNameString());
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}
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static jobjectArray Field_getDeclaredAnnotations(JNIEnv* env, jobject javaField) {
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ScopedFastNativeObjectAccess soa(env);
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ArtField* field = soa.Decode<mirror::Field>(javaField)->GetArtField();
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if (field->GetDeclaringClass()->IsProxyClass()) {
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// Return an empty array instead of a null pointer.
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ObjPtr<mirror::Class> annotation_array_class =
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soa.Decode<mirror::Class>(WellKnownClasses::java_lang_annotation_Annotation__array);
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ObjPtr<mirror::ObjectArray<mirror::Object>> empty_array =
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mirror::ObjectArray<mirror::Object>::Alloc(soa.Self(), annotation_array_class, 0);
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return soa.AddLocalReference<jobjectArray>(empty_array);
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}
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return soa.AddLocalReference<jobjectArray>(annotations::GetAnnotationsForField(field));
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}
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static jobjectArray Field_getSignatureAnnotation(JNIEnv* env, jobject javaField) {
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ScopedFastNativeObjectAccess soa(env);
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ArtField* field = soa.Decode<mirror::Field>(javaField)->GetArtField();
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if (field->GetDeclaringClass()->IsProxyClass()) {
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return nullptr;
|
}
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return soa.AddLocalReference<jobjectArray>(annotations::GetSignatureAnnotationForField(field));
|
}
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static jboolean Field_isAnnotationPresentNative(JNIEnv* env,
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jobject javaField,
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jclass annotationType) {
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ScopedFastNativeObjectAccess soa(env);
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StackHandleScope<1> hs(soa.Self());
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ArtField* field = soa.Decode<mirror::Field>(javaField)->GetArtField();
|
if (field->GetDeclaringClass()->IsProxyClass()) {
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return false;
|
}
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Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class>(annotationType)));
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return annotations::IsFieldAnnotationPresent(field, klass);
|
}
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static JNINativeMethod gMethods[] = {
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FAST_NATIVE_METHOD(Field, get, "(Ljava/lang/Object;)Ljava/lang/Object;"),
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FAST_NATIVE_METHOD(Field, getBoolean, "(Ljava/lang/Object;)Z"),
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FAST_NATIVE_METHOD(Field, getByte, "(Ljava/lang/Object;)B"),
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FAST_NATIVE_METHOD(Field, getChar, "(Ljava/lang/Object;)C"),
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FAST_NATIVE_METHOD(Field, getAnnotationNative,
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"(Ljava/lang/Class;)Ljava/lang/annotation/Annotation;"),
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FAST_NATIVE_METHOD(Field, getArtField, "()J"),
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FAST_NATIVE_METHOD(Field, getDeclaredAnnotations, "()[Ljava/lang/annotation/Annotation;"),
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FAST_NATIVE_METHOD(Field, getSignatureAnnotation, "()[Ljava/lang/String;"),
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FAST_NATIVE_METHOD(Field, getDouble, "(Ljava/lang/Object;)D"),
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FAST_NATIVE_METHOD(Field, getFloat, "(Ljava/lang/Object;)F"),
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FAST_NATIVE_METHOD(Field, getInt, "(Ljava/lang/Object;)I"),
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FAST_NATIVE_METHOD(Field, getLong, "(Ljava/lang/Object;)J"),
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FAST_NATIVE_METHOD(Field, getNameInternal, "()Ljava/lang/String;"),
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FAST_NATIVE_METHOD(Field, getShort, "(Ljava/lang/Object;)S"),
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FAST_NATIVE_METHOD(Field, isAnnotationPresentNative, "(Ljava/lang/Class;)Z"),
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FAST_NATIVE_METHOD(Field, set, "(Ljava/lang/Object;Ljava/lang/Object;)V"),
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FAST_NATIVE_METHOD(Field, setBoolean, "(Ljava/lang/Object;Z)V"),
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FAST_NATIVE_METHOD(Field, setByte, "(Ljava/lang/Object;B)V"),
|
FAST_NATIVE_METHOD(Field, setChar, "(Ljava/lang/Object;C)V"),
|
FAST_NATIVE_METHOD(Field, setDouble, "(Ljava/lang/Object;D)V"),
|
FAST_NATIVE_METHOD(Field, setFloat, "(Ljava/lang/Object;F)V"),
|
FAST_NATIVE_METHOD(Field, setInt, "(Ljava/lang/Object;I)V"),
|
FAST_NATIVE_METHOD(Field, setLong, "(Ljava/lang/Object;J)V"),
|
FAST_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
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