initial checkin of SkSL compiler

src/sksl/ir/SkSLSymbol.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_SYMBOL
+#define SKSL_SYMBOL
+
+#include "SkSLIRNode.h"
+
+namespace SkSL {
+
+/**
+ * Represents a symboltable entry.
+ */
+struct Symbol : public IRNode {
+    enum Kind {
+        kFunctionDeclaration_Kind,
+        kUnresolvedFunction_Kind,
+        kType_Kind,
+        kVariable_Kind,
+        kField_Kind
+    };
+
+    Symbol(Position position, Kind kind, std::string name)
+    : INHERITED(position)
+    , fKind(kind)
+    , fName(std::move(name)) {}
+
+    const Kind fKind;
+    const std::string fName;
+
+    typedef IRNode INHERITED;
+};
+
+} // namespace
+
+#endif