workbench/libs/mesa/src/glsl/ir_visitor.h

   1 /* -*- c++ -*- */
   2 /*
   3  * Copyright © 2010 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #pragma once
  26 #ifndef IR_VISITOR_H
  27 #define IR_VISITOR_H
  28
  29 /**
  30  * Abstract base class of visitors of IR instruction trees
  31  */
  32 class ir_visitor {
  33 public:
  34    virtual ~ir_visitor()
  35    {
  36       /* empty */
  37    }
  38
  39    /**
  40     * \name Visit methods
  41     *
  42     * As typical for the visitor pattern, there must be one \c visit method for
  43     * each concrete subclass of \c ir_instruction.  Virtual base classes within
  44     * the hierarchy should not have \c visit methods.
  45     */
  46    /*@{*/
  47    virtual void visit(class ir_variable *) = 0;
  48    virtual void visit(class ir_function_signature *) = 0;
  49    virtual void visit(class ir_function *) = 0;
  50    virtual void visit(class ir_expression *) = 0;
  51    virtual void visit(class ir_texture *) = 0;
  52    virtual void visit(class ir_swizzle *) = 0;
  53    virtual void visit(class ir_dereference_variable *) = 0;
  54    virtual void visit(class ir_dereference_array *) = 0;
  55    virtual void visit(class ir_dereference_record *) = 0;
  56    virtual void visit(class ir_assignment *) = 0;
  57    virtual void visit(class ir_constant *) = 0;
  58    virtual void visit(class ir_call *) = 0;
  59    virtual void visit(class ir_return *) = 0;
  60    virtual void visit(class ir_discard *) = 0;
  61    virtual void visit(class ir_if *) = 0;
  62    virtual void visit(class ir_loop *) = 0;
  63    virtual void visit(class ir_loop_jump *) = 0;
  64    /*@}*/
  65 };
  66
  67 /* NOTE: function calls may never return due to discards inside them
  68  * This is usually not an issue, but if it is, keep it in mind
  69  */
  70 class ir_control_flow_visitor : public ir_visitor {
  71 public:
  72    virtual void visit(class ir_variable *) {}
  73    virtual void visit(class ir_expression *) {}
  74    virtual void visit(class ir_texture *) {}
  75    virtual void visit(class ir_swizzle *) {}
  76    virtual void visit(class ir_dereference_variable *) {}
  77    virtual void visit(class ir_dereference_array *) {}
  78    virtual void visit(class ir_dereference_record *) {}
  79    virtual void visit(class ir_assignment *) {}
  80    virtual void visit(class ir_constant *) {}
  81    virtual void visit(class ir_call *) {}
  82 };
  83
  84 #endif /* IR_VISITOR_H */