Revert "Revert "Introduce a class to implement optimization passes.""

This reverts commit 1ddbf6d4b37979a9f11a203c12befd5ae8b65df4.

Change-Id: I110a14668d1564ee0604dc958b91394b40da89fc

1 files changed, 48 insertions, 0 deletions

diff --git a/compiler/optimizing/constant_folding.h b/compiler/optimizing/constant_folding.h
new file mode 100644
index 0000000..d2acfa6
--- /dev/null
+++ b/compiler/optimizing/constant_folding.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_
+#define ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_
+
+#include "nodes.h"
+#include "optimization.h"
+
+namespace art {
+
+/**
+ * Optimization pass performing a simple constant-expression
+ * evaluation on the SSA form.
+ *
+ * This class is named art::HConstantFolding to avoid name
+ * clashes with the art::ConstantPropagation class defined in
+ * compiler/dex/post_opt_passes.h.
+ */
+class HConstantFolding : public HOptimization {
+ public:
+  HConstantFolding(HGraph* graph, const HGraphVisualizer& visualizer)
+      : HOptimization(graph, true, kConstantFoldingPassName, visualizer) {}
+
+  virtual void Run() OVERRIDE;
+
+  static constexpr const char* kConstantFoldingPassName = "constant_folding";
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HConstantFolding);
+};
+
+}  // namespace art
+
+#endif  // ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_