// 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" 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() && !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