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      1 /*
      2  * Copyright (C) 2015 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_COMPILER_DEX_QUICK_LAZY_DEBUG_FRAME_OPCODE_WRITER_H_
     18 #define ART_COMPILER_DEX_QUICK_LAZY_DEBUG_FRAME_OPCODE_WRITER_H_
     19 
     20 #include "base/arena_allocator.h"
     21 #include "base/arena_containers.h"
     22 #include "dwarf/debug_frame_opcode_writer.h"
     23 
     24 namespace art {
     25 struct LIR;
     26 namespace dwarf {
     27 
     28 // When we are generating the CFI code, we do not know the instuction offsets,
     29 // this class stores the LIR references and patches the instruction stream later.
     30 class LazyDebugFrameOpCodeWriter FINAL
     31     : public DebugFrameOpCodeWriter<ArenaAllocatorAdapter<uint8_t>> {
     32   typedef DebugFrameOpCodeWriter<ArenaAllocatorAdapter<uint8_t>> Base;
     33  public:
     34   // This method is implicitely called the by opcode writers.
     35   virtual void ImplicitlyAdvancePC() OVERRIDE {
     36     DCHECK_EQ(patched_, false);
     37     DCHECK_EQ(this->current_pc_, 0);
     38     advances_.push_back({this->data()->size(), *last_lir_insn_});
     39   }
     40 
     41   const ArenaVector<uint8_t>* Patch(size_t code_size);
     42 
     43   explicit LazyDebugFrameOpCodeWriter(LIR** last_lir_insn, bool enable_writes,
     44                                       ArenaAllocator* allocator)
     45     : Base(enable_writes, allocator->Adapter()),
     46       last_lir_insn_(last_lir_insn),
     47       advances_(allocator->Adapter()),
     48       patched_(false) {
     49   }
     50 
     51  private:
     52   typedef struct {
     53     size_t pos;
     54     LIR* last_lir_insn;
     55   } Advance;
     56 
     57   using Base::data;  // Hidden. Use Patch method instead.
     58 
     59   LIR** last_lir_insn_;
     60   ArenaVector<Advance> advances_;
     61   bool patched_;
     62 
     63   DISALLOW_COPY_AND_ASSIGN(LazyDebugFrameOpCodeWriter);
     64 };
     65 
     66 }  // namespace dwarf
     67 }  // namespace art
     68 
     69 #endif  // ART_COMPILER_DEX_QUICK_LAZY_DEBUG_FRAME_OPCODE_WRITER_H_
     70