js/src/jit/StackSlotAllocator.h@6474c204b198 (annotated)
js/src/jit/StackSlotAllocator.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * vim: set ts=8 sts=4 et sw=4 tw=99: |
| michael@0 | 3 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #ifndef jit_StackSlotAllocator_h |
| michael@0 | 8 | #define jit_StackSlotAllocator_h |
| michael@0 | 9 | |
| michael@0 | 10 | #include "jit/Registers.h" |
| michael@0 | 11 | |
| michael@0 | 12 | namespace js { |
| michael@0 | 13 | namespace jit { |
| michael@0 | 14 | |
| michael@0 | 15 | class StackSlotAllocator |
| michael@0 | 16 | { |
| michael@0 | 17 | js::Vector<uint32_t, 4, SystemAllocPolicy> normalSlots; |
| michael@0 | 18 | js::Vector<uint32_t, 4, SystemAllocPolicy> doubleSlots; |
| michael@0 | 19 | uint32_t height_; |
| michael@0 | 20 | |
| michael@0 | 21 | void freeSlot(uint32_t index) { |
| michael@0 | 22 | normalSlots.append(index); |
| michael@0 | 23 | } |
| michael@0 | 24 | void freeDoubleSlot(uint32_t index) { |
| michael@0 | 25 | doubleSlots.append(index); |
| michael@0 | 26 | } |
| michael@0 | 27 | |
| michael@0 | 28 | uint32_t allocateDoubleSlot() { |
| michael@0 | 29 | if (!doubleSlots.empty()) |
| michael@0 | 30 | return doubleSlots.popCopy(); |
| michael@0 | 31 | if (height_ % 8 != 0) |
| michael@0 | 32 | normalSlots.append(height_ += 4); |
| michael@0 | 33 | return height_ += 8; |
| michael@0 | 34 | } |
| michael@0 | 35 | uint32_t allocateSlot() { |
| michael@0 | 36 | if (!normalSlots.empty()) |
| michael@0 | 37 | return normalSlots.popCopy(); |
| michael@0 | 38 | if (!doubleSlots.empty()) { |
| michael@0 | 39 | uint32_t index = doubleSlots.popCopy(); |
| michael@0 | 40 | normalSlots.append(index - 4); |
| michael@0 | 41 | return index; |
| michael@0 | 42 | } |
| michael@0 | 43 | return height_ += 4; |
| michael@0 | 44 | } |
| michael@0 | 45 | |
| michael@0 | 46 | public: |
| michael@0 | 47 | StackSlotAllocator() : height_(0) |
| michael@0 | 48 | { } |
| michael@0 | 49 | |
| michael@0 | 50 | void freeSlot(LDefinition::Type type, uint32_t index) { |
| michael@0 | 51 | switch (type) { |
| michael@0 | 52 | #if JS_BITS_PER_WORD == 32 |
| michael@0 | 53 | case LDefinition::GENERAL: |
| michael@0 | 54 | case LDefinition::OBJECT: |
| michael@0 | 55 | case LDefinition::SLOTS: |
| michael@0 | 56 | #endif |
| michael@0 | 57 | case LDefinition::INT32: |
| michael@0 | 58 | case LDefinition::FLOAT32: return freeSlot(index); |
| michael@0 | 59 | #if JS_BITS_PER_WORD == 64 |
| michael@0 | 60 | case LDefinition::GENERAL: |
| michael@0 | 61 | case LDefinition::OBJECT: |
| michael@0 | 62 | case LDefinition::SLOTS: |
| michael@0 | 63 | #endif |
| michael@0 | 64 | #ifdef JS_PUNBOX64 |
| michael@0 | 65 | case LDefinition::BOX: |
| michael@0 | 66 | #endif |
| michael@0 | 67 | #ifdef JS_NUNBOX32 |
| michael@0 | 68 | case LDefinition::TYPE: |
| michael@0 | 69 | case LDefinition::PAYLOAD: |
| michael@0 | 70 | #endif |
| michael@0 | 71 | case LDefinition::DOUBLE: return freeDoubleSlot(index); |
| michael@0 | 72 | default: MOZ_ASSUME_UNREACHABLE("Unknown slot type"); |
| michael@0 | 73 | } |
| michael@0 | 74 | } |
| michael@0 | 75 | |
| michael@0 | 76 | uint32_t allocateSlot(LDefinition::Type type) { |
| michael@0 | 77 | switch (type) { |
| michael@0 | 78 | #if JS_BITS_PER_WORD == 32 |
| michael@0 | 79 | case LDefinition::GENERAL: |
| michael@0 | 80 | case LDefinition::OBJECT: |
| michael@0 | 81 | case LDefinition::SLOTS: |
| michael@0 | 82 | #endif |
| michael@0 | 83 | case LDefinition::INT32: |
| michael@0 | 84 | case LDefinition::FLOAT32: return allocateSlot(); |
| michael@0 | 85 | #if JS_BITS_PER_WORD == 64 |
| michael@0 | 86 | case LDefinition::GENERAL: |
| michael@0 | 87 | case LDefinition::OBJECT: |
| michael@0 | 88 | case LDefinition::SLOTS: |
| michael@0 | 89 | #endif |
| michael@0 | 90 | #ifdef JS_PUNBOX64 |
| michael@0 | 91 | case LDefinition::BOX: |
| michael@0 | 92 | #endif |
| michael@0 | 93 | #ifdef JS_NUNBOX32 |
| michael@0 | 94 | case LDefinition::TYPE: |
| michael@0 | 95 | case LDefinition::PAYLOAD: |
| michael@0 | 96 | #endif |
| michael@0 | 97 | case LDefinition::DOUBLE: return allocateDoubleSlot(); |
| michael@0 | 98 | default: MOZ_ASSUME_UNREACHABLE("Unknown slot type"); |
| michael@0 | 99 | } |
| michael@0 | 100 | } |
| michael@0 | 101 | |
| michael@0 | 102 | uint32_t stackHeight() const { |
| michael@0 | 103 | return height_; |
| michael@0 | 104 | } |
| michael@0 | 105 | }; |
| michael@0 | 106 | |
| michael@0 | 107 | } // namespace jit |
| michael@0 | 108 | } // namespace js |
| michael@0 | 109 | |
| michael@0 | 110 | #endif /* jit_StackSlotAllocator_h */ |
