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. ImplicitlyAdvancePC()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 LazyDebugFrameOpCodeWriter(LIR ** last_lir_insn,bool enable_writes,ArenaAllocator * allocator)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