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/* -*- 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 */
#ifndef jit_Safepoints_h
#define jit_Safepoints_h
#include "jit/BitSet.h"
#include "jit/CompactBuffer.h"
#include "jit/shared/Assembler-shared.h"
namespace js {
namespace jit {
struct SafepointSlotEntry;
class LAllocation;
class LSafepoint;
static const uint32_t INVALID_SAFEPOINT_OFFSET = uint32_t(-1);
class SafepointWriter
CompactBufferWriter stream_;
BitSet frameSlots_;
BitSet argumentSlots_;
explicit SafepointWriter(uint32_t slotCount, uint32_t argumentCount);
bool init(TempAllocator& alloc);
// A safepoint entry is written in the order these functions appear.
uint32_t startEntry();
void writeOsiCallPointOffset(uint32_t osiPointOffset);
void writeGcRegs(LSafepoint* safepoint);
void writeGcSlots(LSafepoint* safepoint);
void writeValueSlots(LSafepoint* safepoint);
void writeSlotsOrElementsSlots(LSafepoint* safepoint);
#ifdef JS_NUNBOX32
void writeNunboxParts(LSafepoint* safepoint);
void endEntry();
void encode(LSafepoint* safepoint);
size_t size() const {
return stream_.length();
const uint8_t* buffer() const {
return stream_.buffer();
bool oom() const {
return stream_.oom();
class SafepointReader
CompactBufferReader stream_;
uint32_t frameSlots_;
uint32_t argumentSlots_;
uint32_t currentSlotChunk_;
bool currentSlotsAreStack_;
uint32_t nextSlotChunkNumber_;
uint32_t osiCallPointOffset_;
GeneralRegisterSet gcSpills_;
GeneralRegisterSet valueSpills_;
GeneralRegisterSet slotsOrElementsSpills_;
GeneralRegisterSet allGprSpills_;
FloatRegisterSet allFloatSpills_;
uint32_t nunboxSlotsRemaining_;
uint32_t slotsOrElementsSlotsRemaining_;
void advanceFromGcRegs();
void advanceFromGcSlots();
void advanceFromValueSlots();
void advanceFromNunboxSlots();
bool getSlotFromBitmap(SafepointSlotEntry* entry);
SafepointReader(IonScript* script, const SafepointIndex* si);
static CodeLocationLabel InvalidationPatchPoint(IonScript* script, const SafepointIndex* si);
uint32_t osiCallPointOffset() const {
return osiCallPointOffset_;
LiveGeneralRegisterSet gcSpills() const {
return LiveGeneralRegisterSet(gcSpills_);
LiveGeneralRegisterSet slotsOrElementsSpills() const {
return LiveGeneralRegisterSet(slotsOrElementsSpills_);
LiveGeneralRegisterSet valueSpills() const {
return LiveGeneralRegisterSet(valueSpills_);
LiveGeneralRegisterSet allGprSpills() const {
return LiveGeneralRegisterSet(allGprSpills_);
LiveFloatRegisterSet allFloatSpills() const {
return LiveFloatRegisterSet(allFloatSpills_);
uint32_t osiReturnPointOffset() const;
// Returns true if a slot was read, false if there are no more slots.
bool getGcSlot(SafepointSlotEntry* entry);
// Returns true if a slot was read, false if there are no more value slots.
bool getValueSlot(SafepointSlotEntry* entry);
// Returns true if a nunbox slot was read, false if there are no more
// nunbox slots.
bool getNunboxSlot(LAllocation* type, LAllocation* payload);
// Returns true if a slot was read, false if there are no more slots.
bool getSlotsOrElementsSlot(SafepointSlotEntry* entry);
} // namespace jit
} // namespace js
#endif /* jit_Safepoints_h */