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34c5ac614c
* Fixes #2358. Added to the reducer the ability to remove a function that is not directly called. Factored out some code from the optimizer to help with this.
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
// Copyright (c) 2017 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/opt/eliminate_dead_functions_pass.h"
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#include "source/opt/eliminate_dead_functions_util.h"
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#include <unordered_set>
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace opt {
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Pass::Status EliminateDeadFunctionsPass::Process() {
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// Identify live functions first. Those that are not live
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// are dead.
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std::unordered_set<const Function*> live_function_set;
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ProcessFunction mark_live = [&live_function_set](Function* fp) {
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live_function_set.insert(fp);
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return false;
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};
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context()->ProcessReachableCallTree(mark_live);
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bool modified = false;
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for (auto funcIter = get_module()->begin();
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funcIter != get_module()->end();) {
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if (live_function_set.count(&*funcIter) == 0) {
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modified = true;
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funcIter =
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eliminatedeadfunctionsutil::EliminateFunction(context(), &funcIter);
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} else {
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++funcIter;
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}
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}
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return modified ? Pass::Status::SuccessWithChange
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: Pass::Status::SuccessWithoutChange;
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}
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} // namespace opt
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} // namespace spvtools
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