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// Copyright 2015 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/frame.h"
#include "src/compiler/linkage.h"
#include "src/compiler/register-allocator.h"
#include "src/macro-assembler.h"
namespace v8 {
namespace internal {
namespace compiler {
Frame::Frame(int fixed_frame_size_in_slots)
: fixed_slot_count_(fixed_frame_size_in_slots),
frame_slot_count_(fixed_frame_size_in_slots),
spill_slot_count_(0),
return_slot_count_(0),
allocated_registers_(nullptr),
allocated_double_registers_(nullptr) {}
int Frame::AlignFrame(int alignment) {
int alignment_slots = alignment / kPointerSize;
// We have to align return slots separately, because they are claimed
// separately on the stack.
int return_delta =
alignment_slots - (return_slot_count_ & (alignment_slots - 1));
if (return_delta != alignment_slots) {
frame_slot_count_ += return_delta;
}
int delta = alignment_slots - (frame_slot_count_ & (alignment_slots - 1));
if (delta != alignment_slots) {
frame_slot_count_ += delta;
if (spill_slot_count_ != 0) {
spill_slot_count_ += delta;
}
}
return delta;
}
void FrameAccessState::MarkHasFrame(bool state) {
has_frame_ = state;
SetFrameAccessToDefault();
}
void FrameAccessState::SetFrameAccessToDefault() {
if (has_frame() && !FLAG_turbo_sp_frame_access) {
SetFrameAccessToFP();
} else {
SetFrameAccessToSP();
}
}
FrameOffset FrameAccessState::GetFrameOffset(int spill_slot) const {
const int frame_offset = FrameSlotToFPOffset(spill_slot);
if (access_frame_with_fp()) {
return FrameOffset::FromFramePointer(frame_offset);
} else {
// No frame. Retrieve all parameters relative to stack pointer.
int sp_offset = frame_offset + GetSPToFPOffset();
return FrameOffset::FromStackPointer(sp_offset);
}
}
} // namespace compiler
} // namespace internal
} // namespace v8
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