diff -r 000000000000 -r 6474c204b198 gfx/angle/src/compiler/DetectCallDepth.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/angle/src/compiler/DetectCallDepth.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,80 @@
+//
+// Copyright (c) 2002-2011 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#ifndef COMPILER_DETECT_RECURSION_H_
+#define COMPILER_DETECT_RECURSION_H_
+
+#include "GLSLANG/ShaderLang.h"
+
+#include <limits.h>
+#include "compiler/intermediate.h"
+#include "compiler/VariableInfo.h"
+
+class TInfoSink;
+
+// Traverses intermediate tree to detect function recursion.
+class DetectCallDepth : public TIntermTraverser {
+public:
+    enum ErrorCode {
+        kErrorMissingMain,
+        kErrorRecursion,
+        kErrorMaxDepthExceeded,
+        kErrorNone
+    };
+
+    DetectCallDepth(TInfoSink& infoSync, bool limitCallStackDepth, int maxCallStackDepth);
+    ~DetectCallDepth();
+
+    virtual bool visitAggregate(Visit, TIntermAggregate*);
+
+    bool checkExceedsMaxDepth(int depth);
+
+    ErrorCode detectCallDepth();
+
+private:
+    class FunctionNode {
+    public:
+        static const int kInfiniteCallDepth = INT_MAX;
+
+        FunctionNode(const TString& fname);
+
+        const TString& getName() const;
+
+        // If a function is already in the callee list, this becomes a no-op.
+        void addCallee(FunctionNode* callee);
+
+        // Returns kInifinityCallDepth if recursive function calls are detected.
+        int detectCallDepth(DetectCallDepth* detectCallDepth, int depth);
+
+        // Reset state.
+        void reset();
+
+    private:
+        // mangled function name is unique.
+        TString name;
+
+        // functions that are directly called by this function.
+        TVector<FunctionNode*> callees;
+
+        Visit visit;
+    };
+
+    ErrorCode detectCallDepthForFunction(FunctionNode* func);
+    FunctionNode* findFunctionByName(const TString& name);
+    void resetFunctionNodes();
+
+    TInfoSink& getInfoSink() { return infoSink; }
+
+    TVector<FunctionNode*> functions;
+    FunctionNode* currentFunction;
+    TInfoSink& infoSink;
+    int maxDepth;
+
+    DetectCallDepth(const DetectCallDepth&);
+    void operator=(const DetectCallDepth&);
+};
+
+#endif  // COMPILER_DETECT_RECURSION_H_