| /* -*- 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 "jit/Registers.h" |
| |
| namespace js { |
| namespace jit { |
| |
| class StackSlotAllocator |
| { |
| js::Vector<uint32_t, 4, SystemAllocPolicy> normalSlots; |
| js::Vector<uint32_t, 4, SystemAllocPolicy> doubleSlots; |
| js::Vector<uint32_t, 4, SystemAllocPolicy> quadSlots; |
| uint32_t height_; |
| |
| void freeSlot(uint32_t index) { |
| normalSlots.append(index); |
| } |
| void freeDoubleSlot(uint32_t index) { |
| doubleSlots.append(index); |
| } |
| void freeQuadSlot(uint32_t index) { |
| MOZ_ASSERT(SupportsSimd); |
| quadSlots.append(index); |
| } |
| |
| uint32_t allocateQuadSlot() { |
| MOZ_ASSERT(SupportsSimd); |
| // This relies on the fact that any architecture specific |
| // alignment of the stack pointer is done a priori. |
| if (!quadSlots.empty()) |
| return quadSlots.popCopy(); |
| if (height_ % 8 != 0) |
| normalSlots.append(height_ += 4); |
| if (height_ % 16 != 0) |
| doubleSlots.append(height_ += 8); |
| return height_ += 16; |
| } |
| uint32_t allocateDoubleSlot() { |
| if (!doubleSlots.empty()) |
| return doubleSlots.popCopy(); |
| if (!quadSlots.empty()) { |
| uint32_t index = quadSlots.popCopy(); |
| doubleSlots.append(index - 8); |
| return index; |
| } |
| if (height_ % 8 != 0) |
| normalSlots.append(height_ += 4); |
| return height_ += 8; |
| } |
| uint32_t allocateSlot() { |
| if (!normalSlots.empty()) |
| return normalSlots.popCopy(); |
| if (!doubleSlots.empty()) { |
| uint32_t index = doubleSlots.popCopy(); |
| normalSlots.append(index - 4); |
| return index; |
| } |
| if (!quadSlots.empty()) { |
| uint32_t index = quadSlots.popCopy(); |
| normalSlots.append(index - 4); |
| doubleSlots.append(index - 8); |
| return index; |
| } |
| return height_ += 4; |
| } |
| |
| public: |
| StackSlotAllocator() : height_(0) |
| { } |
| |
| static uint32_t width(LDefinition::Type type) { |
| switch (type) { |
| #if JS_BITS_PER_WORD == 32 |
| case LDefinition::GENERAL: |
| case LDefinition::OBJECT: |
| case LDefinition::SLOTS: |
| #endif |
| case LDefinition::INT32: |
| case LDefinition::FLOAT32: return 4; |
| #if JS_BITS_PER_WORD == 64 |
| case LDefinition::GENERAL: |
| case LDefinition::OBJECT: |
| case LDefinition::SLOTS: |
| #endif |
| #ifdef JS_PUNBOX64 |
| case LDefinition::BOX: |
| #endif |
| #ifdef JS_NUNBOX32 |
| case LDefinition::TYPE: |
| case LDefinition::PAYLOAD: |
| #endif |
| case LDefinition::DOUBLE: return 8; |
| case LDefinition::SINCOS: |
| case LDefinition::FLOAT32X4: |
| case LDefinition::INT32X4: return 16; |
| } |
| MOZ_CRASH("Unknown slot type"); |
| } |
| |
| void freeSlot(LDefinition::Type type, uint32_t index) { |
| switch (width(type)) { |
| case 4: return freeSlot(index); |
| case 8: return freeDoubleSlot(index); |
| case 16: return freeQuadSlot(index); |
| } |
| MOZ_CRASH("Unknown slot width"); |
| } |
| |
| uint32_t allocateSlot(LDefinition::Type type) { |
| switch (width(type)) { |
| case 4: return allocateSlot(); |
| case 8: return allocateDoubleSlot(); |
| case 16: return allocateQuadSlot(); |
| } |
| MOZ_CRASH("Unknown slot width"); |
| } |
| |
| uint32_t stackHeight() const { |
| return height_; |
| } |
| }; |
| |
| } // namespace jit |
| } // namespace js |
| |
| #endif /* jit_StackSlotAllocator_h */ |