initial checkin of SkSL compiler

src/sksl/ir/SkSLReturnStatement.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+ 
+#ifndef SKSL_RETURNSTATEMENT
+#define SKSL_RETURNSTATEMENT
+
+#include "SkSLExpression.h"
+#include "SkSLStatement.h"
+
+namespace SkSL {
+
+/**
+ * A 'return' statement.
+ */
+struct ReturnStatement : public Statement {
+    ReturnStatement(Position position)
+    : INHERITED(position, kReturn_Kind) {}
+
+    ReturnStatement(std::unique_ptr<Expression> expression)
+    : INHERITED(expression->fPosition, kReturn_Kind) 
+    , fExpression(std::move(expression)) {}
+
+    std::string description() const override {
+        if (fExpression) {
+            return "return " + fExpression->description() + ";";
+        } else {
+            return "return;";
+        }
+    }
+
+    const std::unique_ptr<Expression> fExpression;
+
+    typedef Statement INHERITED;
+};
+
+} // namespace
+
+#endif