1 files changed, 37 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/compiler/translator/IsASTDepthBelowLimit.cpp b/gfx/angle/checkout/src/compiler/translator/IsASTDepthBelowLimit.cpp
new file mode 100644
index 0000000000..74a1b55807
--- /dev/null
+++ b/gfx/angle/checkout/src/compiler/translator/IsASTDepthBelowLimit.cpp
@@ -0,0 +1,37 @@
+//
+// Copyright 2017 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.
+//
+
+#include "compiler/translator/IsASTDepthBelowLimit.h"
+
+#include "compiler/translator/tree_util/IntermTraverse.h"
+
+namespace sh
+{
+
+namespace
+{
+
+// Traverse the tree and compute max depth. Takes a maximum depth limit to prevent stack overflow.
+class MaxDepthTraverser : public TIntermTraverser
+{
+  public:
+    MaxDepthTraverser(int depthLimit) : TIntermTraverser(true, false, false, nullptr)
+    {
+        setMaxAllowedDepth(depthLimit);
+    }
+};
+
+}  // anonymous namespace
+
+bool IsASTDepthBelowLimit(TIntermNode *root, int maxDepth)
+{
+    MaxDepthTraverser traverser(maxDepth + 1);
+    root->traverse(&traverser);
+
+    return traverser.getMaxDepth() <= maxDepth;
+}
+
+}  // namespace sh