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  1. /*
  2.  * Copyright © 2010 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21.  * DEALINGS IN THE SOFTWARE.
  22.  */
  23.  
  24. /**
  25.  * \file ir_variable_refcount.h
  26.  *
  27.  * Provides a visitor which produces a list of variables referenced,
  28.  * how many times they were referenced and assigned, and whether they
  29.  * were defined in the scope.
  30.  */
  31.  
  32. #include "ir.h"
  33. #include "ir_visitor.h"
  34. #include "glsl_types.h"
  35.  
  36. class variable_entry : public exec_node
  37. {
  38. public:
  39.    variable_entry(ir_variable *var);
  40.  
  41.    ir_variable *var; /* The key: the variable's pointer. */
  42.    ir_assignment *assign; /* An assignment to the variable, if any */
  43.  
  44.    /** Number of times the variable is referenced, including assignments. */
  45.    unsigned referenced_count;
  46.  
  47.    /** Number of times the variable is assigned. */
  48.    unsigned assigned_count;
  49.  
  50.    bool declaration; /* If the variable had a decl in the instruction stream */
  51. };
  52.  
  53. class ir_variable_refcount_visitor : public ir_hierarchical_visitor {
  54. public:
  55.    ir_variable_refcount_visitor(void)
  56.    {
  57.       this->mem_ctx = ralloc_context(NULL);
  58.       this->variable_list.make_empty();
  59.    }
  60.  
  61.    ~ir_variable_refcount_visitor(void)
  62.    {
  63.       ralloc_free(this->mem_ctx);
  64.    }
  65.  
  66.    virtual ir_visitor_status visit(ir_variable *);
  67.    virtual ir_visitor_status visit(ir_dereference_variable *);
  68.  
  69.    virtual ir_visitor_status visit_enter(ir_function_signature *);
  70.    virtual ir_visitor_status visit_leave(ir_assignment *);
  71.  
  72.    variable_entry *get_variable_entry(ir_variable *var);
  73.  
  74.    /* List of variable_entry */
  75.    exec_list variable_list;
  76.  
  77.    void *mem_ctx;
  78. };
  79.