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 #ifdef __cplusplus
  30 /**
  31  * Abstract base class of visitors of IR instruction trees
  32  */
  33 class ir_visitor {
  34 public:
  35    virtual ~ir_visitor()
  36    {
  37       /* empty */
  38    }
  39
  40    /**
  41     * \name Visit methods
  42     *
  43     * As typical for the visitor pattern, there must be one \c visit method for
  44     * each concrete subclass of \c ir_instruction.  Virtual base classes within
  45     * the hierarchy should not have \c visit methods.
  46     */
  47    /*@{*/
  48    virtual void visit(class ir_rvalue *) { assert(!"unhandled error_type"); }
  49    virtual void visit(class ir_variable *) = 0;
  50    virtual void visit(class ir_function_signature *) = 0;
  51    virtual void visit(class ir_function *) = 0;
  52    virtual void visit(class ir_expression *) = 0;
  53    virtual void visit(class ir_texture *) = 0;
  54    virtual void visit(class ir_swizzle *) = 0;
  55    virtual void visit(class ir_dereference_variable *) = 0;
  56    virtual void visit(class ir_dereference_array *) = 0;
  57    virtual void visit(class ir_dereference_record *) = 0;
  58    virtual void visit(class ir_assignment *) = 0;
  59    virtual void visit(class ir_constant *) = 0;
  60    virtual void visit(class ir_call *) = 0;
  61    virtual void visit(class ir_return *) = 0;
  62    virtual void visit(class ir_discard *) = 0;
  63    virtual void visit(class ir_if *) = 0;
  64    virtual void visit(class ir_loop *) = 0;
  65    virtual void visit(class ir_loop_jump *) = 0;
  66    virtual void visit(class ir_emit_vertex *) = 0;
  67    virtual void visit(class ir_end_primitive *) = 0;
  68    virtual void visit(class ir_barrier *) = 0;
  69    /*@}*/
  70 };
  71
  72 /* NOTE: function calls may never return due to discards inside them
  73  * This is usually not an issue, but if it is, keep it in mind
  74  */
  75 class ir_control_flow_visitor : public ir_visitor {
  76 public:
  77    virtual void visit(class ir_variable *) {}
  78    virtual void visit(class ir_expression *) {}
  79    virtual void visit(class ir_texture *) {}
  80    virtual void visit(class ir_swizzle *) {}
  81    virtual void visit(class ir_dereference_variable *) {}
  82    virtual void visit(class ir_dereference_array *) {}
  83    virtual void visit(class ir_dereference_record *) {}
  84    virtual void visit(class ir_assignment *) {}
  85    virtual void visit(class ir_constant *) {}
  86    virtual void visit(class ir_call *) {}
  87    virtual void visit(class ir_emit_vertex *) {}
  88    virtual void visit(class ir_end_primitive *) {}
  89    virtual void visit(class ir_barrier *) {}
  90 };
  91 #endif /* __cplusplus */
  92
  93 #endif /* IR_VISITOR_H */