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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 "main/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_key_pointer_equal);
  42. }
  43.  
  44. static void
  45. free_entry(struct hash_entry *entry)
  46. {
  47.    ir_variable_refcount_entry *ivre = (ir_variable_refcount_entry *) entry->data;
  48.    delete ivre;
  49. }
  50.  
  51. ir_variable_refcount_visitor::~ir_variable_refcount_visitor()
  52. {
  53.    ralloc_free(this->mem_ctx);
  54.    _mesa_hash_table_destroy(this->ht, free_entry);
  55. }
  56.  
  57. // constructor
  58. ir_variable_refcount_entry::ir_variable_refcount_entry(ir_variable *var)
  59. {
  60.    this->var = var;
  61.    assign = NULL;
  62.    assigned_count = 0;
  63.    declaration = false;
  64.    referenced_count = 0;
  65. }
  66.  
  67.  
  68. ir_variable_refcount_entry *
  69. ir_variable_refcount_visitor::get_variable_entry(ir_variable *var)
  70. {
  71.    assert(var);
  72.  
  73.    struct hash_entry *e = _mesa_hash_table_search(this->ht,
  74.                                                     _mesa_hash_pointer(var),
  75.                                                     var);
  76.    if (e)
  77.       return (ir_variable_refcount_entry *)e->data;
  78.  
  79.    ir_variable_refcount_entry *entry = new ir_variable_refcount_entry(var);
  80.    assert(entry->referenced_count == 0);
  81.    _mesa_hash_table_insert(this->ht, _mesa_hash_pointer(var), var, entry);
  82.  
  83.    return entry;
  84. }
  85.  
  86.  
  87. ir_visitor_status
  88. ir_variable_refcount_visitor::visit(ir_variable *ir)
  89. {
  90.    ir_variable_refcount_entry *entry = this->get_variable_entry(ir);
  91.    if (entry)
  92.       entry->declaration = true;
  93.  
  94.    return visit_continue;
  95. }
  96.  
  97.  
  98. ir_visitor_status
  99. ir_variable_refcount_visitor::visit(ir_dereference_variable *ir)
  100. {
  101.    ir_variable *const var = ir->variable_referenced();
  102.    ir_variable_refcount_entry *entry = this->get_variable_entry(var);
  103.  
  104.    if (entry)
  105.       entry->referenced_count++;
  106.  
  107.    return visit_continue;
  108. }
  109.  
  110.  
  111. ir_visitor_status
  112. ir_variable_refcount_visitor::visit_enter(ir_function_signature *ir)
  113. {
  114.    /* We don't want to descend into the function parameters and
  115.     * dead-code eliminate them, so just accept the body here.
  116.     */
  117.    visit_list_elements(this, &ir->body);
  118.    return visit_continue_with_parent;
  119. }
  120.  
  121.  
  122. ir_visitor_status
  123. ir_variable_refcount_visitor::visit_leave(ir_assignment *ir)
  124. {
  125.    ir_variable_refcount_entry *entry;
  126.    entry = this->get_variable_entry(ir->lhs->variable_referenced());
  127.    if (entry) {
  128.       entry->assigned_count++;
  129.       if (entry->assign == NULL)
  130.          entry->assign = ir;
  131.    }
  132.  
  133.    return visit_continue;
  134. }
  135.