initial checkin of SkSL compiler

src/sksl/ir/SkSLUnresolvedFunction.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_UNRESOLVEDFUNCTION
+#define SKSL_UNRESOLVEDFUNCTION
+
+#include "SkSLFunctionDeclaration.h"
+
+namespace SkSL {
+
+/**
+ * A symbol representing multiple functions with the same name.
+ */
+struct UnresolvedFunction : public Symbol {
+    UnresolvedFunction(std::vector<std::shared_ptr<FunctionDeclaration>> funcs)
+    : INHERITED(Position(), kUnresolvedFunction_Kind, funcs[0]->fName)
+    , fFunctions(std::move(funcs)) {
+        for (auto func : funcs) {
+                ASSERT(func->fName == fName);
+        }
+    }
+
+    virtual std::string description() const override {
+        return fName;
+    }
+
+    const std::vector<std::shared_ptr<FunctionDeclaration>> fFunctions;
+
+    typedef Symbol INHERITED;
+};
+
+} // namespace
+
+#endif