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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. #include "util/hash_table.h"
  37.  
  38. ir_variable_refcount_visitor::ir_variable_refcount_visitor()
  39. {
  40.    this->mem_ctx = ralloc_context(NULL);
  41.    this->ht = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
  42.                                       _mesa_key_pointer_equal);
  43. }
  44.  
  45. static void
  46. free_entry(struct hash_entry *entry)
  47. {
  48.    ir_variable_refcount_entry *ivre = (ir_variable_refcount_entry *) entry->data;
  49.    delete ivre;
  50. }
  51.  
  52. ir_variable_refcount_visitor::~ir_variable_refcount_visitor()
  53. {
  54.    ralloc_free(this->mem_ctx);
  55.    _mesa_hash_table_destroy(this->ht, free_entry);
  56. }
  57.  
  58. // constructor
  59. ir_variable_refcount_entry::ir_variable_refcount_entry(ir_variable *var)
  60. {
  61.    this->var = var;
  62.    assign = NULL;
  63.    assigned_count = 0;
  64.    declaration = false;
  65.    referenced_count = 0;
  66. }
  67.  
  68.  
  69. ir_variable_refcount_entry *
  70. ir_variable_refcount_visitor::get_variable_entry(ir_variable *var)
  71. {
  72.    assert(var);
  73.  
  74.    struct hash_entry *e = _mesa_hash_table_search(this->ht, var);
  75.    if (e)
  76.       return (ir_variable_refcount_entry *)e->data;
  77.  
  78.    ir_variable_refcount_entry *entry = new ir_variable_refcount_entry(var);
  79.    assert(entry->referenced_count == 0);
  80.    _mesa_hash_table_insert(this->ht, var, entry);
  81.  
  82.    return entry;
  83. }
  84.  
  85.  
  86. ir_visitor_status
  87. ir_variable_refcount_visitor::visit(ir_variable *ir)
  88. {
  89.    ir_variable_refcount_entry *entry = this->get_variable_entry(ir);
  90.    if (entry)
  91.       entry->declaration = true;
  92.  
  93.    return visit_continue;
  94. }
  95.  
  96.  
  97. ir_visitor_status
  98. ir_variable_refcount_visitor::visit(ir_dereference_variable *ir)
  99. {
  100.    ir_variable *const var = ir->variable_referenced();
  101.    ir_variable_refcount_entry *entry = this->get_variable_entry(var);
  102.  
  103.    if (entry)
  104.       entry->referenced_count++;
  105.  
  106.    return visit_continue;
  107. }
  108.  
  109.  
  110. ir_visitor_status
  111. ir_variable_refcount_visitor::visit_enter(ir_function_signature *ir)
  112. {
  113.    /* We don't want to descend into the function parameters and
  114.     * dead-code eliminate them, so just accept the body here.
  115.     */
  116.    visit_list_elements(this, &ir->body);
  117.    return visit_continue_with_parent;
  118. }
  119.  
  120.  
  121. ir_visitor_status
  122. ir_variable_refcount_visitor::visit_leave(ir_assignment *ir)
  123. {
  124.    ir_variable_refcount_entry *entry;
  125.    entry = this->get_variable_entry(ir->lhs->variable_referenced());
  126.    if (entry) {
  127.       entry->assigned_count++;
  128.       if (entry->assign == NULL)
  129.          entry->assign = ir;
  130.    }
  131.  
  132.    return visit_continue;
  133. }
  134.