initial checkin of SkSL compiler

src/sksl/ir/SkSLDoStatement.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_DOSTATEMENT
+#define SKSL_DOSTATEMENT
+
+#include "SkSLExpression.h"
+#include "SkSLStatement.h"
+
+namespace SkSL {
+
+/**
+ * A 'do' statement.
+ */
+struct DoStatement : public Statement {

[dogben, 2016/06/22 17:43:57]

Similar to comment above, in my experience, loops disappear in IR.

[ethannicholas, 2016/06/24 21:23:09]

Again, that's only an option when you have access to goto, which I don't :-(.
Furthermore, even SPIR-V (which does include a goto) requires that you know
you're dealing with a loop because of its (mandatory) structured loop ops.

+    DoStatement(Position position, std::unique_ptr<Statement> statement,
+                std::unique_ptr<Expression> test)
+    : INHERITED(position, kDo_Kind)
+    , fStatement(std::move(statement))
+    , fTest(std::move(test)) {}
+
+    std::string description() const override {
+        return "do " + fStatement->description() + " while (" + fTest->description() + ");";
+    }
+
+    const std::unique_ptr<Statement> fStatement;
+    const std::unique_ptr<Expression> fTest;
+
+    typedef Statement INHERITED;
+};
+
+} // namespace
+
+#endif