// 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 "source/opt/cfg_cleanup_pass.h"

#include "source/opt/function.h"

namespace spvtools {

namespace opt {

Pass::Status CFGCleanupPass::Process() {

  // Process all entry point functions.

  ProcessFunction pfn = [this](Function* fp) { return CFGCleanup(fp); };

  bool modified = context()->ProcessReachableCallTree(pfn);

  return modified ? Pass::Status::SuccessWithChange

                  : Pass::Status::SuccessWithoutChange;

}

}  // namespace opt

}  // namespace spvtools