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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. #include "src/compiler/backend/x64/unwinding-info-writer-x64.h" #include "src/compiler/backend/instruction.h" namespace v8 { namespace internal { namespace compiler { void UnwindingInfoWriter::BeginInstructionBlock(int pc_offset, const InstructionBlock* block) { if (!enabled()) return; block_will_exit_ = false; DCHECK_LT(block->rpo_number().ToInt(), static_cast<int>(block_initial_states_.size())); const BlockInitialState* initial_state = block_initial_states_[block->rpo_number().ToInt()]; if (!initial_state) return; if (initial_state->register_ != eh_frame_writer_.base_register() && initial_state->offset_ != eh_frame_writer_.base_offset()) { eh_frame_writer_.AdvanceLocation(pc_offset); eh_frame_writer_.SetBaseAddressRegisterAndOffset(initial_state->register_, initial_state->offset_); } else if (initial_state->register_ != eh_frame_writer_.base_register()) { eh_frame_writer_.AdvanceLocation(pc_offset); eh_frame_writer_.SetBaseAddressRegister(initial_state->register_); } else if (initial_state->offset_ != eh_frame_writer_.base_offset()) { eh_frame_writer_.AdvanceLocation(pc_offset); eh_frame_writer_.SetBaseAddressOffset(initial_state->offset_); } tracking_fp_ = initial_state->tracking_fp_; } void UnwindingInfoWriter::EndInstructionBlock(const InstructionBlock* block) { if (!enabled() || block_will_exit_) return; for (const RpoNumber& successor : block->successors()) { int successor_index = successor.ToInt(); DCHECK_LT(successor_index, static_cast<int>(block_initial_states_.size())); const BlockInitialState* existing_state = block_initial_states_[successor_index]; // If we already had an entry for this BB, check that the values are the // same we are trying to insert. if (existing_state) { DCHECK(existing_state->register_ == eh_frame_writer_.base_register()); DCHECK_EQ(existing_state->offset_, eh_frame_writer_.base_offset()); DCHECK_EQ(existing_state->tracking_fp_, tracking_fp_); } else { block_initial_states_[successor_index] = new (zone_) BlockInitialState(eh_frame_writer_.base_register(), eh_frame_writer_.base_offset(), tracking_fp_); } } } void UnwindingInfoWriter::MarkFrameConstructed(int pc_base) { if (!enabled()) return; // push rbp eh_frame_writer_.AdvanceLocation(pc_base + 1); eh_frame_writer_.IncreaseBaseAddressOffset(kInt64Size); // <base address> points at the bottom of the current frame on x64 and // <base register> is rsp, which points to the top of the frame by definition. // Thus, the distance between <base address> and the top is -<base offset>. int top_of_stack = -eh_frame_writer_.base_offset(); eh_frame_writer_.RecordRegisterSavedToStack(rbp, top_of_stack); // mov rbp, rsp eh_frame_writer_.AdvanceLocation(pc_base + 4); eh_frame_writer_.SetBaseAddressRegister(rbp); tracking_fp_ = true; } void UnwindingInfoWriter::MarkFrameDeconstructed(int pc_base) { if (!enabled()) return; // mov rsp, rbp eh_frame_writer_.AdvanceLocation(pc_base + 3); eh_frame_writer_.SetBaseAddressRegister(rsp); // pop rbp eh_frame_writer_.AdvanceLocation(pc_base + 4); eh_frame_writer_.IncreaseBaseAddressOffset(-kInt64Size); tracking_fp_ = false; } } // namespace compiler } // namespace internal } // namespace v8