| // Copyright (c) 2017 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "source/opt/eliminate_dead_functions_pass.h" |
| |
| #include <unordered_set> |
| |
| #include "source/opt/eliminate_dead_functions_util.h" |
| #include "source/opt/ir_context.h" |
| |
| namespace spvtools { |
| namespace opt { |
| |
| Pass::Status EliminateDeadFunctionsPass::Process() { |
| // Identify live functions first. Those that are not live |
| // are dead. |
| std::unordered_set<const Function*> live_function_set; |
| ProcessFunction mark_live = [&live_function_set](Function* fp) { |
| live_function_set.insert(fp); |
| return false; |
| }; |
| context()->ProcessReachableCallTree(mark_live); |
| |
| bool modified = false; |
| for (auto funcIter = get_module()->begin(); |
| funcIter != get_module()->end();) { |
| if (live_function_set.count(&*funcIter) == 0) { |
| modified = true; |
| funcIter = |
| eliminatedeadfunctionsutil::EliminateFunction(context(), &funcIter); |
| } else { |
| ++funcIter; |
| } |
| } |
| |
| return modified ? Pass::Status::SuccessWithChange |
| : Pass::Status::SuccessWithoutChange; |
| } |
| |
| } // namespace opt |
| } // namespace spvtools |