1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_COMPILER_ARM_UNWINDING_INFO_WRITER_H_ 6 #define V8_COMPILER_ARM_UNWINDING_INFO_WRITER_H_ 7 8 #include "src/eh-frame.h" 9 10 namespace v8 { 11 namespace internal { 12 namespace compiler { 13 14 class InstructionBlock; 15 16 class UnwindingInfoWriter { 17 public: 18 explicit UnwindingInfoWriter(Zone* zone) 19 : zone_(zone), 20 eh_frame_writer_(zone), 21 saved_lr_(false), 22 block_will_exit_(false), 23 block_initial_states_(zone) { 24 if (enabled()) eh_frame_writer_.Initialize(); 25 } 26 27 void SetNumberOfInstructionBlocks(int number) { 28 if (enabled()) block_initial_states_.resize(number); 29 } 30 31 void BeginInstructionBlock(int pc_offset, const InstructionBlock* block); 32 void EndInstructionBlock(const InstructionBlock* block); 33 34 void MarkLinkRegisterOnTopOfStack(int pc_offset); 35 void MarkPopLinkRegisterFromTopOfStack(int pc_offset); 36 37 void MarkFrameConstructed(int at_pc); 38 void MarkFrameDeconstructed(int at_pc); 39 40 void MarkBlockWillExit() { block_will_exit_ = true; } 41 42 void Finish(int code_size) { 43 if (enabled()) eh_frame_writer_.Finish(code_size); 44 } 45 46 EhFrameWriter* eh_frame_writer() { 47 return enabled() ? &eh_frame_writer_ : nullptr; 48 } 49 50 private: 51 bool enabled() const { return FLAG_perf_prof_unwinding_info; } 52 53 class BlockInitialState : public ZoneObject { 54 public: 55 explicit BlockInitialState(bool saved_lr) : saved_lr_(saved_lr) {} 56 57 bool saved_lr_; 58 }; 59 60 Zone* zone_; 61 EhFrameWriter eh_frame_writer_; 62 bool saved_lr_; 63 bool block_will_exit_; 64 65 ZoneVector<const BlockInitialState*> block_initial_states_; 66 }; 67 68 } // namespace compiler 69 } // namespace internal 70 } // namespace v8 71 72 #endif 73
