Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===-- EscapeEnumerator.h --------------------------------------*- 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

//

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

//

// Defines a helper class that enumerates all possible exits from a function,

// including exception handling.

//

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

#ifndef LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H

#define LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H

#include "llvm/IR/Function.h"

#include "llvm/IR/IRBuilder.h"

namespace llvm {

class DomTreeUpdater;

/// EscapeEnumerator - This is a little algorithm to find all escape points

/// from a function so that "finally"-style code can be inserted. In addition

/// to finding the existing return and unwind instructions, it also (if

/// necessary) transforms any call instructions into invokes and sends them to

/// a landing pad.

class EscapeEnumerator {

  Function &F;

  const char *CleanupBBName;

  Function::iterator StateBB, StateE;

  IRBuilder<> Builder;

  bool Done = false;

  bool HandleExceptions;

  DomTreeUpdater *DTU;

public:

  EscapeEnumerator(Function &F, const char *N = "cleanup",

                   bool HandleExceptions = true, DomTreeUpdater *DTU = nullptr)

      : F(F), CleanupBBName(N), StateBB(F.begin()), StateE(F.end()),

        Builder(F.getContext()), HandleExceptions(HandleExceptions), DTU(DTU) {}

  IRBuilder<> *Next();

};

}

#endif // LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H