1 //===-- UnifyFunctionExitNodes.h - Ensure fn's have one return --*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This pass is used to ensure that functions have at most one return and one
10 // unreachable instruction in them.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H
15 #define LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H
16 
17 #include "llvm/IR/PassManager.h"
18 #include "llvm/Pass.h"
19 
20 namespace llvm {
21 
22 class UnifyFunctionExitNodesLegacyPass : public FunctionPass {
23 public:
24   static char ID; // Pass identification, replacement for typeid
25   UnifyFunctionExitNodesLegacyPass();
26 
27   // We can preserve non-critical-edgeness when we unify function exit nodes
28   void getAnalysisUsage(AnalysisUsage &AU) const override;
29 
30   bool runOnFunction(Function &F) override;
31 };
32 
33 Pass *createUnifyFunctionExitNodesPass();
34 
35 class UnifyFunctionExitNodesPass
36     : public PassInfoMixin<UnifyFunctionExitNodesPass> {
37 public:
38   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
39 };
40 
41 } // end namespace llvm
42 
43 #endif // LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H
44