| // 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. |
| |
| // This file implements a pass to cleanup the CFG to remove superfluous |
| // constructs (e.g., unreachable basic blocks, empty control flow structures, |
| // etc) |
| |
| #include <queue> |
| #include <unordered_set> |
| |
| #include "cfg_cleanup_pass.h" |
| |
| #include "function.h" |
| #include "module.h" |
| |
| namespace spvtools { |
| namespace opt { |
| |
| void CFGCleanupPass::Initialize(ir::IRContext* c) { InitializeProcessing(c); } |
| |
| Pass::Status CFGCleanupPass::Process(ir::IRContext* c) { |
| Initialize(c); |
| |
| // Process all entry point functions. |
| ProcessFunction pfn = [this](ir::Function* fp) { return CFGCleanup(fp); }; |
| bool modified = ProcessReachableCallTree(pfn, context()); |
| return modified ? Pass::Status::SuccessWithChange |
| : Pass::Status::SuccessWithoutChange; |
| } |
| |
| } // namespace opt |
| } // namespace spvtools |
