1 files changed, 45 insertions, 0 deletions
diff --git a/deps/v8/src/compiler/lowering-builder.cc b/deps/v8/src/compiler/lowering-builder.cc
new file mode 100644
index 000000000..1246f54f1
--- /dev/null
+++ b/deps/v8/src/compiler/lowering-builder.cc
@@ -0,0 +1,45 @@
+// Copyright 2014 the V8 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 "src/compiler/graph-inl.h"
+#include "src/compiler/lowering-builder.h"
+#include "src/compiler/node-aux-data-inl.h"
+#include "src/compiler/node-properties-inl.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+class LoweringBuilder::NodeVisitor : public NullNodeVisitor {
+ public:
+  explicit NodeVisitor(LoweringBuilder* lowering) : lowering_(lowering) {}
+
+  GenericGraphVisit::Control Post(Node* node) {
+    if (lowering_->source_positions_ != NULL) {
+      SourcePositionTable::Scope pos(lowering_->source_positions_, node);
+      lowering_->Lower(node);
+    } else {
+      lowering_->Lower(node);
+    }
+    return GenericGraphVisit::CONTINUE;
+  }
+
+ private:
+  LoweringBuilder* lowering_;
+};
+
+
+LoweringBuilder::LoweringBuilder(Graph* graph,
+                                 SourcePositionTable* source_positions)
+    : graph_(graph), source_positions_(source_positions) {}
+
+
+void LoweringBuilder::LowerAllNodes() {
+  NodeVisitor visitor(this);
+  graph()->VisitNodeInputsFromEnd(&visitor);
+}
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8