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comparison: js/src/jit/StackSlotAllocator.h
js/src/jit/StackSlotAllocator.h
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| -1:000000000000 | 0:5efff98017b7 |
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef jit_StackSlotAllocator_h | |
| 8 #define jit_StackSlotAllocator_h | |
| 9 | |
| 10 #include "jit/Registers.h" | |
| 11 | |
| 12 namespace js { | |
| 13 namespace jit { | |
| 14 | |
| 15 class StackSlotAllocator | |
| 16 { | |
| 17 js::Vector<uint32_t, 4, SystemAllocPolicy> normalSlots; | |
| 18 js::Vector<uint32_t, 4, SystemAllocPolicy> doubleSlots; | |
| 19 uint32_t height_; | |
| 20 | |
| 21 void freeSlot(uint32_t index) { | |
| 22 normalSlots.append(index); | |
| 23 } | |
| 24 void freeDoubleSlot(uint32_t index) { | |
| 25 doubleSlots.append(index); | |
| 26 } | |
| 27 | |
| 28 uint32_t allocateDoubleSlot() { | |
| 29 if (!doubleSlots.empty()) | |
| 30 return doubleSlots.popCopy(); | |
| 31 if (height_ % 8 != 0) | |
| 32 normalSlots.append(height_ += 4); | |
| 33 return height_ += 8; | |
| 34 } | |
| 35 uint32_t allocateSlot() { | |
| 36 if (!normalSlots.empty()) | |
| 37 return normalSlots.popCopy(); | |
| 38 if (!doubleSlots.empty()) { | |
| 39 uint32_t index = doubleSlots.popCopy(); | |
| 40 normalSlots.append(index - 4); | |
| 41 return index; | |
| 42 } | |
| 43 return height_ += 4; | |
| 44 } | |
| 45 | |
| 46 public: | |
| 47 StackSlotAllocator() : height_(0) | |
| 48 { } | |
| 49 | |
| 50 void freeSlot(LDefinition::Type type, uint32_t index) { | |
| 51 switch (type) { | |
| 52 #if JS_BITS_PER_WORD == 32 | |
| 53 case LDefinition::GENERAL: | |
| 54 case LDefinition::OBJECT: | |
| 55 case LDefinition::SLOTS: | |
| 56 #endif | |
| 57 case LDefinition::INT32: | |
| 58 case LDefinition::FLOAT32: return freeSlot(index); | |
| 59 #if JS_BITS_PER_WORD == 64 | |
| 60 case LDefinition::GENERAL: | |
| 61 case LDefinition::OBJECT: | |
| 62 case LDefinition::SLOTS: | |
| 63 #endif | |
| 64 #ifdef JS_PUNBOX64 | |
| 65 case LDefinition::BOX: | |
| 66 #endif | |
| 67 #ifdef JS_NUNBOX32 | |
| 68 case LDefinition::TYPE: | |
| 69 case LDefinition::PAYLOAD: | |
| 70 #endif | |
| 71 case LDefinition::DOUBLE: return freeDoubleSlot(index); | |
| 72 default: MOZ_ASSUME_UNREACHABLE("Unknown slot type"); | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 uint32_t allocateSlot(LDefinition::Type type) { | |
| 77 switch (type) { | |
| 78 #if JS_BITS_PER_WORD == 32 | |
| 79 case LDefinition::GENERAL: | |
| 80 case LDefinition::OBJECT: | |
| 81 case LDefinition::SLOTS: | |
| 82 #endif | |
| 83 case LDefinition::INT32: | |
| 84 case LDefinition::FLOAT32: return allocateSlot(); | |
| 85 #if JS_BITS_PER_WORD == 64 | |
| 86 case LDefinition::GENERAL: | |
| 87 case LDefinition::OBJECT: | |
| 88 case LDefinition::SLOTS: | |
| 89 #endif | |
| 90 #ifdef JS_PUNBOX64 | |
| 91 case LDefinition::BOX: | |
| 92 #endif | |
| 93 #ifdef JS_NUNBOX32 | |
| 94 case LDefinition::TYPE: | |
| 95 case LDefinition::PAYLOAD: | |
| 96 #endif | |
| 97 case LDefinition::DOUBLE: return allocateDoubleSlot(); | |
| 98 default: MOZ_ASSUME_UNREACHABLE("Unknown slot type"); | |
| 99 } | |
| 100 } | |
| 101 | |
| 102 uint32_t stackHeight() const { | |
| 103 return height_; | |
| 104 } | |
| 105 }; | |
| 106 | |
| 107 } // namespace jit | |
| 108 } // namespace js | |
| 109 | |
| 110 #endif /* jit_StackSlotAllocator_h */ |
