diff -r 000000000000 -r 6474c204b198 js/src/jit/Recover.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit/Recover.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,71 @@
+/* -*- 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_Recover_h
+#define jit_Recover_h
+
+#include "mozilla/Attributes.h"
+
+#include "jit/Snapshots.h"
+
+namespace js {
+namespace jit {
+
+class RResumePoint;
+
+class RInstruction
+{
+  public:
+    enum Opcode
+    {
+        Recover_ResumePoint = 0
+    };
+
+    virtual Opcode opcode() const = 0;
+
+    bool isResumePoint() const {
+        return opcode() == Recover_ResumePoint;
+    }
+    inline const RResumePoint *toResumePoint() const;
+
+    virtual uint32_t numOperands() const = 0;
+
+    static void readRecoverData(CompactBufferReader &reader, RInstructionStorage *raw);
+};
+
+class RResumePoint MOZ_FINAL : public RInstruction
+{
+  private:
+    uint32_t pcOffset_;           // Offset from script->code.
+    uint32_t numOperands_;        // Number of slots.
+
+    friend class RInstruction;
+    RResumePoint(CompactBufferReader &reader);
+
+  public:
+    virtual Opcode opcode() const {
+        return Recover_ResumePoint;
+    }
+
+    uint32_t pcOffset() const {
+        return pcOffset_;
+    }
+    virtual uint32_t numOperands() const {
+        return numOperands_;
+    }
+};
+
+const RResumePoint *
+RInstruction::toResumePoint() const
+{
+    MOZ_ASSERT(isResumePoint());
+    return static_cast<const RResumePoint *>(this);
+}
+
+}
+}
+
+#endif /* jit_Recover_h */