initial checkin of SkSL compiler

src/sksl/ast/SkSLASTIntLiteral.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_ASTINTLITERAL
+#define SKSL_ASTINTLITERAL
+
+#include "SkSLASTExpression.h"
+
+namespace SkSL {
+
+/**
+ * A literal integer. At the AST level, integer literals are always positive; a negative number will
+ * appear as a unary minus being applied to an integer literal.
+ */
+struct ASTIntLiteral : public ASTExpression {
+    ASTIntLiteral(Position position, uint64_t value)
+    : INHERITED(position, kInt_Kind)
+    , fValue(value) {}
+
+    std::string description() const override {
+        return to_string(fValue);
+    }
+
+    const uint64_t fValue;
+
+    typedef ASTExpression INHERITED;
+};
+
+} // namespace
+
+#endif