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diff --git a/js/src/jit/Safepoints.h b/js/src/jit/Safepoints.h
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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 http://mozilla.org/MPL/2.0/. */
+
+#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_;
+
+ public:
+ explicit SafepointWriter(uint32_t slotCount, uint32_t argumentCount);
+ MOZ_MUST_USE bool init(TempAllocator& alloc);
+
+ private:
+ // 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);
+#endif
+
+ void endEntry();
+
+ public:
+ 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_;
+
+ private:
+ void advanceFromGcRegs();
+ void advanceFromGcSlots();
+ void advanceFromValueSlots();
+ void advanceFromNunboxSlots();
+ MOZ_MUST_USE bool getSlotFromBitmap(SafepointSlotEntry* entry);
+
+ public:
+ 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.
+ MOZ_MUST_USE bool getGcSlot(SafepointSlotEntry* entry);
+
+ // Returns true if a slot was read, false if there are no more value slots.
+ MOZ_MUST_USE bool getValueSlot(SafepointSlotEntry* entry);
+
+ // Returns true if a nunbox slot was read, false if there are no more
+ // nunbox slots.
+ MOZ_MUST_USE bool getNunboxSlot(LAllocation* type, LAllocation* payload);
+
+ // Returns true if a slot was read, false if there are no more slots.
+ MOZ_MUST_USE bool getSlotsOrElementsSlot(SafepointSlotEntry* entry);
+};
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_Safepoints_h */