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comparison: js/src/jit/Safepoints.h
js/src/jit/Safepoints.h
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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_Safepoints_h | |
| 8 #define jit_Safepoints_h | |
| 9 | |
| 10 #include "jit/CompactBuffer.h" | |
| 11 #include "jit/shared/Assembler-shared.h" | |
| 12 | |
| 13 namespace js { | |
| 14 namespace jit { | |
| 15 | |
| 16 class BitSet; | |
| 17 struct SafepointNunboxEntry; | |
| 18 class LAllocation; | |
| 19 class LSafepoint; | |
| 20 | |
| 21 static const uint32_t INVALID_SAFEPOINT_OFFSET = uint32_t(-1); | |
| 22 | |
| 23 class SafepointWriter | |
| 24 { | |
| 25 CompactBufferWriter stream_; | |
| 26 BitSet *frameSlots_; | |
| 27 | |
| 28 public: | |
| 29 bool init(TempAllocator &alloc, uint32_t slotCount); | |
| 30 | |
| 31 private: | |
| 32 // A safepoint entry is written in the order these functions appear. | |
| 33 uint32_t startEntry(); | |
| 34 | |
| 35 void writeOsiCallPointOffset(uint32_t osiPointOffset); | |
| 36 void writeGcRegs(LSafepoint *safepoint); | |
| 37 void writeGcSlots(LSafepoint *safepoint); | |
| 38 void writeValueSlots(LSafepoint *safepoint); | |
| 39 | |
| 40 void writeSlotsOrElementsSlots(LSafepoint *safepoint); | |
| 41 | |
| 42 #ifdef JS_NUNBOX32 | |
| 43 void writeNunboxParts(LSafepoint *safepoint); | |
| 44 #endif | |
| 45 | |
| 46 void endEntry(); | |
| 47 | |
| 48 public: | |
| 49 void encode(LSafepoint *safepoint); | |
| 50 | |
| 51 size_t size() const { | |
| 52 return stream_.length(); | |
| 53 } | |
| 54 const uint8_t *buffer() const { | |
| 55 return stream_.buffer(); | |
| 56 } | |
| 57 }; | |
| 58 | |
| 59 class SafepointReader | |
| 60 { | |
| 61 CompactBufferReader stream_; | |
| 62 uint32_t frameSlots_; | |
| 63 uint32_t currentSlotChunk_; | |
| 64 uint32_t nextSlotChunkNumber_; | |
| 65 uint32_t osiCallPointOffset_; | |
| 66 GeneralRegisterSet gcSpills_; | |
| 67 GeneralRegisterSet valueSpills_; | |
| 68 GeneralRegisterSet slotsOrElementsSpills_; | |
| 69 GeneralRegisterSet allGprSpills_; | |
| 70 FloatRegisterSet allFloatSpills_; | |
| 71 uint32_t nunboxSlotsRemaining_; | |
| 72 uint32_t slotsOrElementsSlotsRemaining_; | |
| 73 | |
| 74 private: | |
| 75 void advanceFromGcRegs(); | |
| 76 void advanceFromGcSlots(); | |
| 77 void advanceFromValueSlots(); | |
| 78 void advanceFromNunboxSlots(); | |
| 79 bool getSlotFromBitmap(uint32_t *slot); | |
| 80 | |
| 81 public: | |
| 82 SafepointReader(IonScript *script, const SafepointIndex *si); | |
| 83 | |
| 84 static CodeLocationLabel InvalidationPatchPoint(IonScript *script, const SafepointIndex *si); | |
| 85 | |
| 86 uint32_t osiCallPointOffset() const { | |
| 87 return osiCallPointOffset_; | |
| 88 } | |
| 89 GeneralRegisterSet gcSpills() const { | |
| 90 return gcSpills_; | |
| 91 } | |
| 92 GeneralRegisterSet slotsOrElementsSpills() const { | |
| 93 return slotsOrElementsSpills_; | |
| 94 } | |
| 95 GeneralRegisterSet valueSpills() const { | |
| 96 return valueSpills_; | |
| 97 } | |
| 98 GeneralRegisterSet allGprSpills() const { | |
| 99 return allGprSpills_; | |
| 100 } | |
| 101 FloatRegisterSet allFloatSpills() const { | |
| 102 return allFloatSpills_; | |
| 103 } | |
| 104 uint32_t osiReturnPointOffset() const; | |
| 105 | |
| 106 // Returns true if a slot was read, false if there are no more slots. | |
| 107 bool getGcSlot(uint32_t *slot); | |
| 108 | |
| 109 // Returns true if a slot was read, false if there are no more value slots. | |
| 110 bool getValueSlot(uint32_t *slot); | |
| 111 | |
| 112 // Returns true if a nunbox slot was read, false if there are no more | |
| 113 // nunbox slots. | |
| 114 bool getNunboxSlot(LAllocation *type, LAllocation *payload); | |
| 115 | |
| 116 // Returns true if a slot was read, false if there are no more slots. | |
| 117 bool getSlotsOrElementsSlot(uint32_t *slot); | |
| 118 }; | |
| 119 | |
| 120 } // namespace jit | |
| 121 } // namespace js | |
| 122 | |
| 123 #endif /* jit_Safepoints_h */ |
