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807e967c61
Currently, ir_call can be used as either a statement (for void functions) or a value (for non-void functions). This is rather awkward, as it's the only class that can be used in both forms. A number of places use ir_call::get_error_instruction() to construct a generic value of error_type. If ir_call is to become a statement, it can no longer serve this purpose. Unfortunately, none of our classes are particularly well suited for this, and creating a new one would be rather aggrandizing. So, this patch introduces ir_rvalue::error_value(), a static method that creates an instance of the base class, ir_rvalue. This has the nice property that you can't accidentally try and access uninitialized fields (as it doesn't have any). The downside is that the base class is no longer abstract. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
85 lines
3.2 KiB
C++
85 lines
3.2 KiB
C++
/* -*- 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_rvalue *) { assert(!"unhandled error_type"); }
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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 */
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