| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sts=4 et sw=4 tw=99: |
| * This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| #ifndef jit_StackSlotAllocator_h |
| #define jit_StackSlotAllocator_h |
| |
| #include "Registers.h" |
| |
| namespace js { |
| namespace jit { |
| |
| class StackSlotAllocator |
| { |
| js::Vector<uint32_t, 4, SystemAllocPolicy> normalSlots; |
| js::Vector<uint32_t, 4, SystemAllocPolicy> doubleSlots; |
| uint32_t height_; |
| |
| public: |
| StackSlotAllocator() : height_(0) |
| { } |
| |
| void freeSlot(uint32_t index) { |
| normalSlots.append(index); |
| } |
| void freeDoubleSlot(uint32_t index) { |
| doubleSlots.append(index); |
| } |
| void freeValueSlot(uint32_t index) { |
| freeDoubleSlot(index); |
| } |
| |
| uint32_t allocateDoubleSlot() { |
| if (!doubleSlots.empty()) |
| return doubleSlots.popCopy(); |
| if (ComputeByteAlignment(height_, DOUBLE_STACK_ALIGNMENT)) |
| normalSlots.append(++height_); |
| height_ += (sizeof(double) / STACK_SLOT_SIZE); |
| return height_; |
| } |
| uint32_t allocateSlot() { |
| if (!normalSlots.empty()) |
| return normalSlots.popCopy(); |
| if (!doubleSlots.empty()) { |
| uint32_t index = doubleSlots.popCopy(); |
| normalSlots.append(index - 1); |
| return index; |
| } |
| return ++height_; |
| } |
| uint32_t allocateValueSlot() { |
| return allocateDoubleSlot(); |
| } |
| uint32_t stackHeight() const { |
| return height_; |
| } |
| }; |
| |
| } // namespace jit |
| } // namespace js |
| |
| #endif /* jit_StackSlotAllocator_h */ |
