// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/compiler/frame.h"
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#include "src/compiler/linkage.h"
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#include "src/compiler/register-allocator.h"
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#include "src/macro-assembler.h"
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namespace v8 {
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namespace internal {
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namespace compiler {
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Frame::Frame(int fixed_frame_size_in_slots)
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: fixed_slot_count_(fixed_frame_size_in_slots),
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frame_slot_count_(fixed_frame_size_in_slots),
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spill_slot_count_(0),
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return_slot_count_(0),
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allocated_registers_(nullptr),
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allocated_double_registers_(nullptr) {}
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int Frame::AlignFrame(int alignment) {
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int alignment_slots = alignment / kPointerSize;
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// We have to align return slots separately, because they are claimed
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// separately on the stack.
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int return_delta =
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alignment_slots - (return_slot_count_ & (alignment_slots - 1));
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if (return_delta != alignment_slots) {
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frame_slot_count_ += return_delta;
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}
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int delta = alignment_slots - (frame_slot_count_ & (alignment_slots - 1));
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if (delta != alignment_slots) {
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frame_slot_count_ += delta;
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if (spill_slot_count_ != 0) {
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spill_slot_count_ += delta;
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}
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}
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return delta;
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}
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void FrameAccessState::MarkHasFrame(bool state) {
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has_frame_ = state;
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SetFrameAccessToDefault();
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}
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void FrameAccessState::SetFrameAccessToDefault() {
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if (has_frame() && !FLAG_turbo_sp_frame_access) {
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SetFrameAccessToFP();
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} else {
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SetFrameAccessToSP();
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}
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}
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FrameOffset FrameAccessState::GetFrameOffset(int spill_slot) const {
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const int frame_offset = FrameSlotToFPOffset(spill_slot);
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if (access_frame_with_fp()) {
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return FrameOffset::FromFramePointer(frame_offset);
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} else {
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// No frame. Retrieve all parameters relative to stack pointer.
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int sp_offset = frame_offset + GetSPToFPOffset();
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return FrameOffset::FromStackPointer(sp_offset);
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}
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}
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} // namespace compiler
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} // namespace internal
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} // namespace v8
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