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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ART_RUNTIME_IMAGE_INL_H_
     18 #define ART_RUNTIME_IMAGE_INL_H_
     19 
     20 #include "image.h"
     21 
     22 #include "art_method.h"
     23 #include "imt_conflict_table.h"
     24 #include "imtable.h"
     25 #include "mirror/object_array-inl.h"
     26 #include "obj_ptr-inl.h"
     27 #include "read_barrier-inl.h"
     28 
     29 namespace art {
     30 
     31 template <ReadBarrierOption kReadBarrierOption>
     32 inline ObjPtr<mirror::Object> ImageHeader::GetImageRoot(ImageRoot image_root) const {
     33   ObjPtr<mirror::ObjectArray<mirror::Object>> image_roots = GetImageRoots<kReadBarrierOption>();
     34   return image_roots->Get<kVerifyNone, kReadBarrierOption>(static_cast<int32_t>(image_root));
     35 }
     36 
     37 template <ReadBarrierOption kReadBarrierOption>
     38 inline ObjPtr<mirror::ObjectArray<mirror::Object>> ImageHeader::GetImageRoots() const {
     39   // Need a read barrier as it's not visited during root scan.
     40   // Pass in the address of the local variable to the read barrier
     41   // rather than image_roots_ because it won't move (asserted below)
     42   // and it's a const member.
     43   mirror::ObjectArray<mirror::Object>* image_roots =
     44       reinterpret_cast<mirror::ObjectArray<mirror::Object>*>(image_roots_);
     45   mirror::ObjectArray<mirror::Object>* result =
     46       ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Object>, kReadBarrierOption>(
     47           &image_roots);
     48   DCHECK_EQ(image_roots, result);
     49   return image_roots;
     50 }
     51 
     52 template <typename Visitor>
     53 inline void ImageHeader::VisitPackedArtFields(const Visitor& visitor, uint8_t* base) const {
     54   const ImageSection& fields = GetFieldsSection();
     55   for (size_t pos = 0u; pos < fields.Size(); ) {
     56     auto* array = reinterpret_cast<LengthPrefixedArray<ArtField>*>(base + fields.Offset() + pos);
     57     for (size_t i = 0u; i < array->size(); ++i) {
     58       visitor(array->At(i, sizeof(ArtField)));
     59     }
     60     pos += array->ComputeSize(array->size());
     61   }
     62 }
     63 
     64 template <typename Visitor>
     65 inline void ImageHeader::VisitPackedArtMethods(const Visitor& visitor,
     66                                                uint8_t* base,
     67                                                PointerSize pointer_size) const {
     68   const size_t method_alignment = ArtMethod::Alignment(pointer_size);
     69   const size_t method_size = ArtMethod::Size(pointer_size);
     70   const ImageSection& methods = GetMethodsSection();
     71   for (size_t pos = 0u; pos < methods.Size(); ) {
     72     auto* array = reinterpret_cast<LengthPrefixedArray<ArtMethod>*>(base + methods.Offset() + pos);
     73     for (size_t i = 0u; i < array->size(); ++i) {
     74       visitor(array->At(i, method_size, method_alignment));
     75     }
     76     pos += array->ComputeSize(array->size(), method_size, method_alignment);
     77   }
     78   const ImageSection& runtime_methods = GetRuntimeMethodsSection();
     79   for (size_t pos = 0u; pos < runtime_methods.Size(); ) {
     80     auto* method = reinterpret_cast<ArtMethod*>(base + runtime_methods.Offset() + pos);
     81     visitor(*method);
     82     pos += method_size;
     83   }
     84 }
     85 
     86 template <typename Visitor>
     87 inline void ImageHeader::VisitPackedImTables(const Visitor& visitor,
     88                                              uint8_t* base,
     89                                              PointerSize pointer_size) const {
     90   const ImageSection& section = GetImTablesSection();
     91   for (size_t pos = 0; pos < section.Size();) {
     92     ImTable* imt = reinterpret_cast<ImTable*>(base + section.Offset() + pos);
     93     for (size_t i = 0; i < ImTable::kSize; ++i) {
     94       ArtMethod* orig = imt->Get(i, pointer_size);
     95       ArtMethod* updated = visitor(orig);
     96       if (updated != orig) {
     97         imt->Set(i, updated, pointer_size);
     98       }
     99     }
    100     pos += ImTable::SizeInBytes(pointer_size);
    101   }
    102 }
    103 
    104 template <typename Visitor>
    105 inline void ImageHeader::VisitPackedImtConflictTables(const Visitor& visitor,
    106                                                       uint8_t* base,
    107                                                       PointerSize pointer_size) const {
    108   const ImageSection& section = GetIMTConflictTablesSection();
    109   for (size_t pos = 0; pos < section.Size(); ) {
    110     auto* table = reinterpret_cast<ImtConflictTable*>(base + section.Offset() + pos);
    111     table->Visit([&visitor](const std::pair<ArtMethod*, ArtMethod*>& methods) {
    112       return std::make_pair(visitor(methods.first), visitor(methods.second));
    113     }, pointer_size);
    114     pos += table->ComputeSize(pointer_size);
    115   }
    116 }
    117 
    118 }  // namespace art
    119 
    120 #endif  // ART_RUNTIME_IMAGE_INL_H_
    121