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| 4358 | 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 opt_dead_functions.cpp |
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| 26 | * |
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| 27 | * Eliminates unused functions from the linked program. |
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| 28 | */ |
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| 29 | |||
| 30 | #include "ir.h" |
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| 31 | #include "ir_visitor.h" |
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| 32 | #include "ir_expression_flattening.h" |
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| 33 | #include "glsl_types.h" |
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| 34 | |||
| 35 | namespace { |
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| 36 | |||
| 37 | class signature_entry : public exec_node |
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| 38 | { |
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| 39 | public: |
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| 40 | signature_entry(ir_function_signature *sig) |
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| 41 | { |
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| 42 | this->signature = sig; |
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| 43 | this->used = false; |
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| 44 | } |
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| 45 | |||
| 46 | ir_function_signature *signature; |
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| 47 | bool used; |
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| 48 | }; |
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| 49 | |||
| 50 | class ir_dead_functions_visitor : public ir_hierarchical_visitor { |
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| 51 | public: |
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| 52 | ir_dead_functions_visitor() |
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| 53 | { |
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| 54 | this->mem_ctx = ralloc_context(NULL); |
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| 55 | } |
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| 56 | |||
| 57 | ~ir_dead_functions_visitor() |
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| 58 | { |
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| 59 | ralloc_free(this->mem_ctx); |
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| 60 | } |
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| 61 | |||
| 62 | virtual ir_visitor_status visit_enter(ir_function_signature *); |
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| 63 | virtual ir_visitor_status visit_enter(ir_call *); |
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| 64 | |||
| 65 | signature_entry *get_signature_entry(ir_function_signature *var); |
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| 66 | |||
| 67 | /* List of signature_entry */ |
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| 68 | exec_list signature_list; |
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| 69 | void *mem_ctx; |
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| 70 | }; |
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| 71 | |||
| 72 | } /* unnamed namespace */ |
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| 73 | |||
| 74 | signature_entry * |
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| 75 | ir_dead_functions_visitor::get_signature_entry(ir_function_signature *sig) |
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| 76 | { |
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| 77 | foreach_iter(exec_list_iterator, iter, this->signature_list) { |
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| 78 | signature_entry *entry = (signature_entry *)iter.get(); |
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| 79 | if (entry->signature == sig) |
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| 80 | return entry; |
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| 81 | } |
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| 82 | |||
| 83 | signature_entry *entry = new(mem_ctx) signature_entry(sig); |
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| 84 | this->signature_list.push_tail(entry); |
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| 85 | return entry; |
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| 86 | } |
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| 87 | |||
| 88 | |||
| 89 | ir_visitor_status |
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| 90 | ir_dead_functions_visitor::visit_enter(ir_function_signature *ir) |
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| 91 | { |
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| 92 | signature_entry *entry = this->get_signature_entry(ir); |
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| 93 | |||
| 94 | if (strcmp(ir->function_name(), "main") == 0) { |
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| 95 | entry->used = true; |
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| 96 | } |
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| 97 | |||
| 98 | |||
| 99 | |||
| 100 | return visit_continue; |
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| 101 | } |
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| 102 | |||
| 103 | |||
| 104 | ir_visitor_status |
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| 105 | ir_dead_functions_visitor::visit_enter(ir_call *ir) |
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| 106 | { |
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| 107 | signature_entry *entry = this->get_signature_entry(ir->callee); |
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| 108 | |||
| 109 | entry->used = true; |
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| 110 | |||
| 111 | return visit_continue; |
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| 112 | } |
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| 113 | |||
| 114 | bool |
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| 115 | do_dead_functions(exec_list *instructions) |
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| 116 | { |
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| 117 | ir_dead_functions_visitor v; |
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| 118 | bool progress = false; |
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| 119 | |||
| 120 | visit_list_elements(&v, instructions); |
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| 121 | |||
| 122 | /* Now that we've figured out which function signatures are used, remove |
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| 123 | * the unused ones, and remove function definitions that have no more |
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| 124 | * signatures. |
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| 125 | */ |
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| 126 | foreach_iter(exec_list_iterator, iter, v.signature_list) { |
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| 127 | signature_entry *entry = (signature_entry *)iter.get(); |
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| 128 | |||
| 129 | if (!entry->used) { |
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| 130 | entry->signature->remove(); |
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| 131 | delete entry->signature; |
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| 132 | progress = true; |
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| 133 | } |
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| 134 | delete(entry); |
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| 135 | } |
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| 136 | |||
| 137 | /* We don't just do this above when we nuked a signature because of |
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| 138 | * const pointers. |
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| 139 | */ |
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| 140 | foreach_iter(exec_list_iterator, iter, *instructions) { |
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| 141 | ir_instruction *ir = (ir_instruction *)iter.get(); |
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| 142 | ir_function *func = ir->as_function(); |
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| 143 | |||
| 144 | if (func && func->signatures.is_empty()) { |
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| 145 | /* At this point (post-linking), the symbol table is no |
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| 146 | * longer in use, so not removing the function from the |
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| 147 | * symbol table should be OK. |
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| 148 | */ |
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| 149 | func->remove(); |
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| 150 | delete func; |
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| 151 | progress = true; |
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| 152 | } |
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| 153 | } |
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| 154 | |||
| 155 | return progress; |
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| 156 | } |