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| 1901 | serge | 1 | /* |
| 2 | * Copyright © 2010 Intel Corporation |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice (including the next |
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| 12 | * paragraph) shall be included in all copies or substantial portions of the |
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| 13 | * Software. |
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| 14 | * |
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 21 | * DEALINGS IN THE SOFTWARE. |
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| 22 | */ |
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| 23 | |||
| 24 | /** |
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| 25 | * \file ir_variable_refcount.cpp |
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| 26 | * |
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| 27 | * Provides a visitor which produces a list of variables referenced, |
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| 28 | * how many times they were referenced and assigned, and whether they |
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| 29 | * were defined in the scope. |
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| 30 | */ |
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| 31 | |||
| 32 | #include "ir.h" |
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| 33 | #include "ir_visitor.h" |
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| 34 | #include "ir_variable_refcount.h" |
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| 35 | #include "glsl_types.h" |
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| 36 | |||
| 37 | |||
| 38 | // constructor |
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| 39 | variable_entry::variable_entry(ir_variable *var) |
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| 40 | { |
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| 41 | this->var = var; |
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| 42 | assign = NULL; |
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| 43 | assigned_count = 0; |
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| 44 | declaration = false; |
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| 45 | referenced_count = 0; |
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| 46 | } |
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| 47 | |||
| 48 | |||
| 49 | variable_entry * |
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| 50 | ir_variable_refcount_visitor::get_variable_entry(ir_variable *var) |
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| 51 | { |
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| 52 | assert(var); |
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| 53 | foreach_iter(exec_list_iterator, iter, this->variable_list) { |
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| 54 | variable_entry *entry = (variable_entry *)iter.get(); |
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| 55 | if (entry->var == var) |
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| 56 | return entry; |
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| 57 | } |
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| 58 | |||
| 59 | variable_entry *entry = new(mem_ctx) variable_entry(var); |
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| 60 | assert(entry->referenced_count == 0); |
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| 61 | this->variable_list.push_tail(entry); |
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| 62 | return entry; |
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| 63 | } |
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| 64 | |||
| 65 | |||
| 66 | ir_visitor_status |
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| 67 | ir_variable_refcount_visitor::visit(ir_variable *ir) |
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| 68 | { |
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| 69 | variable_entry *entry = this->get_variable_entry(ir); |
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| 70 | if (entry) |
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| 71 | entry->declaration = true; |
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| 72 | |||
| 73 | return visit_continue; |
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| 74 | } |
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| 75 | |||
| 76 | |||
| 77 | ir_visitor_status |
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| 78 | ir_variable_refcount_visitor::visit(ir_dereference_variable *ir) |
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| 79 | { |
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| 80 | ir_variable *const var = ir->variable_referenced(); |
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| 81 | variable_entry *entry = this->get_variable_entry(var); |
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| 82 | |||
| 83 | if (entry) |
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| 84 | entry->referenced_count++; |
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| 85 | |||
| 86 | return visit_continue; |
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| 87 | } |
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| 88 | |||
| 89 | |||
| 90 | ir_visitor_status |
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| 91 | ir_variable_refcount_visitor::visit_enter(ir_function_signature *ir) |
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| 92 | { |
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| 93 | /* We don't want to descend into the function parameters and |
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| 94 | * dead-code eliminate them, so just accept the body here. |
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| 95 | */ |
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| 96 | visit_list_elements(this, &ir->body); |
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| 97 | return visit_continue_with_parent; |
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| 98 | } |
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| 99 | |||
| 100 | |||
| 101 | ir_visitor_status |
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| 102 | ir_variable_refcount_visitor::visit_leave(ir_assignment *ir) |
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| 103 | { |
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| 104 | variable_entry *entry; |
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| 105 | entry = this->get_variable_entry(ir->lhs->variable_referenced()); |
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| 106 | if (entry) { |
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| 107 | entry->assigned_count++; |
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| 108 | if (entry->assign == NULL) |
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| 109 | entry->assign = ir; |
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| 110 | } |
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| 111 | |||
| 112 | return visit_continue; |
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| 113 | } |