1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jit/Safepoints.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,123 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef jit_Safepoints_h
1.11 +#define jit_Safepoints_h
1.12 +
1.13 +#include "jit/CompactBuffer.h"
1.14 +#include "jit/shared/Assembler-shared.h"
1.15 +
1.16 +namespace js {
1.17 +namespace jit {
1.18 +
1.19 +class BitSet;
1.20 +struct SafepointNunboxEntry;
1.21 +class LAllocation;
1.22 +class LSafepoint;
1.23 +
1.24 +static const uint32_t INVALID_SAFEPOINT_OFFSET = uint32_t(-1);
1.25 +
1.26 +class SafepointWriter
1.27 +{
1.28 + CompactBufferWriter stream_;
1.29 + BitSet *frameSlots_;
1.30 +
1.31 + public:
1.32 + bool init(TempAllocator &alloc, uint32_t slotCount);
1.33 +
1.34 + private:
1.35 + // A safepoint entry is written in the order these functions appear.
1.36 + uint32_t startEntry();
1.37 +
1.38 + void writeOsiCallPointOffset(uint32_t osiPointOffset);
1.39 + void writeGcRegs(LSafepoint *safepoint);
1.40 + void writeGcSlots(LSafepoint *safepoint);
1.41 + void writeValueSlots(LSafepoint *safepoint);
1.42 +
1.43 + void writeSlotsOrElementsSlots(LSafepoint *safepoint);
1.44 +
1.45 +#ifdef JS_NUNBOX32
1.46 + void writeNunboxParts(LSafepoint *safepoint);
1.47 +#endif
1.48 +
1.49 + void endEntry();
1.50 +
1.51 + public:
1.52 + void encode(LSafepoint *safepoint);
1.53 +
1.54 + size_t size() const {
1.55 + return stream_.length();
1.56 + }
1.57 + const uint8_t *buffer() const {
1.58 + return stream_.buffer();
1.59 + }
1.60 +};
1.61 +
1.62 +class SafepointReader
1.63 +{
1.64 + CompactBufferReader stream_;
1.65 + uint32_t frameSlots_;
1.66 + uint32_t currentSlotChunk_;
1.67 + uint32_t nextSlotChunkNumber_;
1.68 + uint32_t osiCallPointOffset_;
1.69 + GeneralRegisterSet gcSpills_;
1.70 + GeneralRegisterSet valueSpills_;
1.71 + GeneralRegisterSet slotsOrElementsSpills_;
1.72 + GeneralRegisterSet allGprSpills_;
1.73 + FloatRegisterSet allFloatSpills_;
1.74 + uint32_t nunboxSlotsRemaining_;
1.75 + uint32_t slotsOrElementsSlotsRemaining_;
1.76 +
1.77 + private:
1.78 + void advanceFromGcRegs();
1.79 + void advanceFromGcSlots();
1.80 + void advanceFromValueSlots();
1.81 + void advanceFromNunboxSlots();
1.82 + bool getSlotFromBitmap(uint32_t *slot);
1.83 +
1.84 + public:
1.85 + SafepointReader(IonScript *script, const SafepointIndex *si);
1.86 +
1.87 + static CodeLocationLabel InvalidationPatchPoint(IonScript *script, const SafepointIndex *si);
1.88 +
1.89 + uint32_t osiCallPointOffset() const {
1.90 + return osiCallPointOffset_;
1.91 + }
1.92 + GeneralRegisterSet gcSpills() const {
1.93 + return gcSpills_;
1.94 + }
1.95 + GeneralRegisterSet slotsOrElementsSpills() const {
1.96 + return slotsOrElementsSpills_;
1.97 + }
1.98 + GeneralRegisterSet valueSpills() const {
1.99 + return valueSpills_;
1.100 + }
1.101 + GeneralRegisterSet allGprSpills() const {
1.102 + return allGprSpills_;
1.103 + }
1.104 + FloatRegisterSet allFloatSpills() const {
1.105 + return allFloatSpills_;
1.106 + }
1.107 + uint32_t osiReturnPointOffset() const;
1.108 +
1.109 + // Returns true if a slot was read, false if there are no more slots.
1.110 + bool getGcSlot(uint32_t *slot);
1.111 +
1.112 + // Returns true if a slot was read, false if there are no more value slots.
1.113 + bool getValueSlot(uint32_t *slot);
1.114 +
1.115 + // Returns true if a nunbox slot was read, false if there are no more
1.116 + // nunbox slots.
1.117 + bool getNunboxSlot(LAllocation *type, LAllocation *payload);
1.118 +
1.119 + // Returns true if a slot was read, false if there are no more slots.
1.120 + bool getSlotsOrElementsSlot(uint32_t *slot);
1.121 +};
1.122 +
1.123 +} // namespace jit
1.124 +} // namespace js
1.125 +
1.126 +#endif /* jit_Safepoints_h */
