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// 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 "eliminate_dead_functions_pass.h"
#include "ir_context.h"
#include <unordered_set>
namespace spvtools {
namespace opt {
Pass::Status EliminateDeadFunctionsPass::Process() {
// Identify live functions first. Those that are not live
// are dead.
std::unordered_set<const opt::Function*> live_function_set;
ProcessFunction mark_live = [&live_function_set](opt::Function* fp) {
live_function_set.insert(fp);
return false;
};
ProcessReachableCallTree(mark_live, context());
bool modified = false;
for (auto funcIter = get_module()->begin();
funcIter != get_module()->end();) {
if (live_function_set.count(&*funcIter) == 0) {
modified = true;
EliminateFunction(&*funcIter);
funcIter = funcIter.Erase();
} else {
++funcIter;
}
}
return modified ? Pass::Status::SuccessWithChange
: Pass::Status::SuccessWithoutChange;
}
void EliminateDeadFunctionsPass::EliminateFunction(opt::Function* func) {
// Remove all of the instruction in the function body
func->ForEachInst(
[this](opt::Instruction* inst) { context()->KillInst(inst); }, true);
}
} // namespace opt
} // namespace spvtools
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