initial checkin of SkSL compiler

src/sksl/ir/SkSLIntLiteral.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_INTLITERAL
+#define SKSL_INTLITERAL
+
+#include "SkSLExpression.h"
+
+namespace SkSL {
+
+/**
+ * A literal integer.
+ */
+struct IntLiteral : public Expression {
+    // FIXME: we will need to revisit this if/when we add full support for both signed and unsigned
+    // 64-bit integers, but for right now an int64_t will hold every value we care about
+    IntLiteral(Position position, int64_t value)
+    : INHERITED(position, kIntLiteral_Kind, kInt_Type)
+    , fValue(value) {}
+
+    virtual std::string description() const override {
+        return to_string(fValue);
+    }
+
+   bool isConstant() const override {
+        return true;
+    }
+
+    const int64_t fValue;
+
+    typedef Expression INHERITED;
+};
+
+} // namespace
+
+#endif