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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_COMPILER_BACKEND_X64_UNWINDING_INFO_WRITER_X64_H_
#define V8_COMPILER_BACKEND_X64_UNWINDING_INFO_WRITER_X64_H_
#include "src/diagnostics/eh-frame.h"
#include "src/flags/flags.h"
namespace v8 {
namespace internal {
namespace compiler {
class InstructionBlock;
class UnwindingInfoWriter {
public:
explicit UnwindingInfoWriter(Zone* zone)
: zone_(zone),
eh_frame_writer_(zone),
tracking_fp_(false),
block_will_exit_(false),
block_initial_states_(zone) {
if (enabled()) eh_frame_writer_.Initialize();
}
void MaybeIncreaseBaseOffsetAt(int pc_offset, int base_delta) {
if (enabled() && !tracking_fp_) {
eh_frame_writer_.AdvanceLocation(pc_offset);
eh_frame_writer_.IncreaseBaseAddressOffset(base_delta);
}
}
void SetNumberOfInstructionBlocks(int number) {
if (enabled()) block_initial_states_.resize(number);
}
void BeginInstructionBlock(int pc_offset, const InstructionBlock* block);
void EndInstructionBlock(const InstructionBlock* block);
void MarkFrameConstructed(int pc_base);
void MarkFrameDeconstructed(int pc_base);
void MarkBlockWillExit() { block_will_exit_ = true; }
void Finish(int code_size) {
if (enabled()) eh_frame_writer_.Finish(code_size);
}
EhFrameWriter* eh_frame_writer() {
return enabled() ? &eh_frame_writer_ : nullptr;
}
private:
bool enabled() const { return FLAG_perf_prof_unwinding_info; }
class BlockInitialState : public ZoneObject {
public:
BlockInitialState(Register reg, int offset, bool tracking_fp)
: register_(reg), offset_(offset), tracking_fp_(tracking_fp) {}
Register register_;
int offset_;
bool tracking_fp_;
};
Zone* zone_;
EhFrameWriter eh_frame_writer_;
bool tracking_fp_;
bool block_will_exit_;
ZoneVector<const BlockInitialState*> block_initial_states_;
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_BACKEND_X64_UNWINDING_INFO_WRITER_X64_H_