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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"
namespace v8 {
namespace internal {
namespace compiler {
Frame::Frame(int fixed_frame_size_in_slots)
: fixed_slot_count_(fixed_frame_size_in_slots),
allocated_registers_(nullptr),
allocated_double_registers_(nullptr) {
slot_allocator_.AllocateUnaligned(fixed_frame_size_in_slots);
}
void Frame::AlignFrame(int alignment) {
#if DEBUG
spill_slots_finished_ = true;
frame_aligned_ = true;
#endif
// In the calculations below we assume that alignment is a power of 2.
DCHECK(base::bits::IsPowerOfTwo(alignment));
int alignment_in_slots = AlignedSlotAllocator::NumSlotsForWidth(alignment);
// We have to align return slots separately, because they are claimed
// separately on the stack.
const int mask = alignment_in_slots - 1;
int return_delta = alignment_in_slots - (return_slot_count_ & mask);
if (return_delta != alignment_in_slots) {
return_slot_count_ += return_delta;
}
int delta = alignment_in_slots - (slot_allocator_.Size() & mask);
if (delta != alignment_in_slots) {
slot_allocator_.Align(alignment_in_slots);
if (spill_slot_count_ != 0) {
spill_slot_count_ += delta;
}
}
}
void FrameAccessState::MarkHasFrame(bool state) {
has_frame_ = state;
SetFrameAccessToDefault();
}
void FrameAccessState::SetFrameAccessToDefault() {
if (has_frame() && !v8_flags.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();
DCHECK_GE(sp_offset, 0);
return FrameOffset::FromStackPointer(sp_offset);
}
}
} // namespace compiler
} // namespace internal
} // namespace v8
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