Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- SimplifyCFG.h - Simplify and canonicalize the CFG --------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

/// \file

/// This file provides the interface for the pass responsible for both

/// simplifying and canonicalizing the CFG.

///

//===----------------------------------------------------------------------===//

#ifndef LLVM_TRANSFORMS_SCALAR_SIMPLIFYCFG_H

#define LLVM_TRANSFORMS_SCALAR_SIMPLIFYCFG_H

#include "llvm/IR/Function.h"

#include "llvm/IR/PassManager.h"

#include "llvm/Transforms/Utils/SimplifyCFGOptions.h"

namespace llvm {

/// A pass to simplify and canonicalize the CFG of a function.

///

/// This pass iteratively simplifies the entire CFG of a function. It may change

/// or remove control flow to put the CFG into a canonical form expected by

/// other passes of the mid-level optimizer. Depending on the specified options,

/// it may further optimize control-flow to create non-canonical forms.

class SimplifyCFGPass : public PassInfoMixin<SimplifyCFGPass> {

  SimplifyCFGOptions Options;

public:

  /// The default constructor sets the pass options to create canonical IR,

  /// rather than optimal IR. That is, by default we bypass transformations that

  /// are likely to improve performance but make analysis for other passes more

  /// difficult.

  SimplifyCFGPass();

  /// Construct a pass with optional optimizations.

  SimplifyCFGPass(const SimplifyCFGOptions &PassOptions);

  /// Run the pass over the function.

  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);

  void printPipeline(raw_ostream &OS,

                     function_ref<StringRef(StringRef)> MapClassName2PassName);

};

}

#endif