diff -r 000000000000 -r 6474c204b198 js/src/jit/ParallelSafetyAnalysis.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit/ParallelSafetyAnalysis.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+/* -*- 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_ParallelSafetyAnalysis_h
+#define jit_ParallelSafetyAnalysis_h
+
+#include "jit/MIR.h"
+
+namespace js {
+
+class InterpreterFrame;
+
+namespace jit {
+
+class MIRGraph;
+class AutoDestroyAllocator;
+
+// Determines whether a function is compatible for parallel execution.
+// Removes basic blocks containing unsafe MIR operations from the
+// graph and replaces them with MAbortPar blocks.
+class ParallelSafetyAnalysis
+{
+    MIRGenerator *mir_;
+    MIRGraph &graph_;
+
+    bool removeResumePointOperands();
+    void replaceOperandsOnResumePoint(MResumePoint *resumePoint, MDefinition *withDef);
+
+  public:
+    ParallelSafetyAnalysis(MIRGenerator *mir,
+                           MIRGraph &graph)
+      : mir_(mir),
+        graph_(graph)
+    {}
+
+    bool analyze();
+};
+
+// Code to collect list of possible call targets by scraping through
+// TI and baseline data. Used to permit speculative transitive
+// compilation in vm/ForkJoin.
+//
+// This code may clone scripts and thus may invoke the GC.  Hence only
+// run from the link phase, which executes on the main thread.
+typedef Vector<JSScript *, 4, IonAllocPolicy> CallTargetVector;
+bool AddPossibleCallees(JSContext *cx, MIRGraph &graph, CallTargetVector &targets);
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_ParallelSafetyAnalysis_h */