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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.cpp
  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 "ir_variable_refcount.h"
  35. #include "glsl_types.h"
  36.  
  37.  
  38. // constructor
  39. variable_entry::variable_entry(ir_variable *var)
  40. {
  41.    this->var = var;
  42.    assign = NULL;
  43.    assigned_count = 0;
  44.    declaration = false;
  45.    referenced_count = 0;
  46. }
  47.  
  48.  
  49. variable_entry *
  50. ir_variable_refcount_visitor::get_variable_entry(ir_variable *var)
  51. {
  52.    assert(var);
  53.    foreach_iter(exec_list_iterator, iter, this->variable_list) {
  54.       variable_entry *entry = (variable_entry *)iter.get();
  55.       if (entry->var == var)
  56.          return entry;
  57.    }
  58.  
  59.    variable_entry *entry = new(mem_ctx) variable_entry(var);
  60.    assert(entry->referenced_count == 0);
  61.    this->variable_list.push_tail(entry);
  62.    return entry;
  63. }
  64.  
  65.  
  66. ir_visitor_status
  67. ir_variable_refcount_visitor::visit(ir_variable *ir)
  68. {
  69.    variable_entry *entry = this->get_variable_entry(ir);
  70.    if (entry)
  71.       entry->declaration = true;
  72.  
  73.    return visit_continue;
  74. }
  75.  
  76.  
  77. ir_visitor_status
  78. ir_variable_refcount_visitor::visit(ir_dereference_variable *ir)
  79. {
  80.    ir_variable *const var = ir->variable_referenced();
  81.    variable_entry *entry = this->get_variable_entry(var);
  82.  
  83.    if (entry)
  84.       entry->referenced_count++;
  85.  
  86.    return visit_continue;
  87. }
  88.  
  89.  
  90. ir_visitor_status
  91. ir_variable_refcount_visitor::visit_enter(ir_function_signature *ir)
  92. {
  93.    /* We don't want to descend into the function parameters and
  94.     * dead-code eliminate them, so just accept the body here.
  95.     */
  96.    visit_list_elements(this, &ir->body);
  97.    return visit_continue_with_parent;
  98. }
  99.  
  100.  
  101. ir_visitor_status
  102. ir_variable_refcount_visitor::visit_leave(ir_assignment *ir)
  103. {
  104.    variable_entry *entry;
  105.    entry = this->get_variable_entry(ir->lhs->variable_referenced());
  106.    if (entry) {
  107.       entry->assigned_count++;
  108.       if (entry->assign == NULL)
  109.          entry->assign = ir;
  110.    }
  111.  
  112.    return visit_continue;
  113. }
  114.