SPIRV-Tools/source/opt/cfg_cleanup_pass.cpp

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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.
// 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