initial checkin of SkSL compiler

src/sksl/ir/SkSLFunctionDefinition.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_FUNCTIONDEFINITION
+#define SKSL_FUNCTIONDEFINITION
+
+#include "SkSLBlock.h"
+#include "SkSLFunctionDeclaration.h"
+#include "SkSLProgramElement.h"
+
+namespace SkSL {
+
+/**
+ * A function definition (a declaration plus an associated block of code).
+ */
+struct FunctionDefinition : public ProgramElement {
+    FunctionDefinition(Position position, std::shared_ptr<FunctionDeclaration> declaration,
+                       std::unique_ptr<Block> body)
+    : INHERITED(position, kFunction_Kind)
+    , fDeclaration(std::move(declaration))
+    , fBody(std::move(body)) {}
+
+    std::string description() const override {
+        return fDeclaration->description() + " " + fBody->description();
+    }
+
+    const std::shared_ptr<FunctionDeclaration> fDeclaration;
+    const std::unique_ptr<Block> fBody;
+
+    typedef ProgramElement INHERITED;
+};
+
+} // namespace
+
+#endif