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/* -*- c++ -*- */
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/*
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 * Copyright © 2010 Intel Corporation
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice (including the next
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 * paragraph) shall be included in all copies or substantial portions of the
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 * Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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 * DEALINGS IN THE SOFTWARE.
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 */
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#pragma once
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#ifndef IR_VISITOR_H
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#define IR_VISITOR_H
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/**
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 * Abstract base class of visitors of IR instruction trees
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 */
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class ir_visitor {
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public:
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   virtual ~ir_visitor()
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   {
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      /* empty */
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   }
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   /**
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    * \name Visit methods
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    *
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    * As typical for the visitor pattern, there must be one \c visit method for
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    * each concrete subclass of \c ir_instruction.  Virtual base classes within
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    * the hierarchy should not have \c visit methods.
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    */
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   /*@{*/
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   virtual void visit(class ir_variable *) = 0;
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   virtual void visit(class ir_function_signature *) = 0;
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   virtual void visit(class ir_function *) = 0;
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   virtual void visit(class ir_expression *) = 0;
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   virtual void visit(class ir_texture *) = 0;
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   virtual void visit(class ir_swizzle *) = 0;
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   virtual void visit(class ir_dereference_variable *) = 0;
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   virtual void visit(class ir_dereference_array *) = 0;
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   virtual void visit(class ir_dereference_record *) = 0;
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   virtual void visit(class ir_assignment *) = 0;
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   virtual void visit(class ir_constant *) = 0;
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   virtual void visit(class ir_call *) = 0;
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   virtual void visit(class ir_return *) = 0;
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   virtual void visit(class ir_discard *) = 0;
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   virtual void visit(class ir_if *) = 0;
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   virtual void visit(class ir_loop *) = 0;
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   virtual void visit(class ir_loop_jump *) = 0;
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   /*@}*/
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};
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/* NOTE: function calls may never return due to discards inside them
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 * This is usually not an issue, but if it is, keep it in mind
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 */
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class ir_control_flow_visitor : public ir_visitor {
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public:
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   virtual void visit(class ir_variable *) {}
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   virtual void visit(class ir_expression *) {}
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   virtual void visit(class ir_texture *) {}
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   virtual void visit(class ir_swizzle *) {}
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   virtual void visit(class ir_dereference_variable *) {}
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   virtual void visit(class ir_dereference_array *) {}
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   virtual void visit(class ir_dereference_record *) {}
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   virtual void visit(class ir_assignment *) {}
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   virtual void visit(class ir_constant *) {}
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   virtual void visit(class ir_call *) {}
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};
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#endif /* IR_VISITOR_H */