| //===-- UnifyFunctionExitNodes.h - Ensure fn's have one return --*- 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This pass is used to ensure that functions have at most one return and one |
| // unwind instruction in them. Additionally, it keeps track of which node is |
| // the new exit node of the CFG. If there are no return or unwind instructions |
| // in the function, the getReturnBlock/getUnwindBlock methods will return a null |
| // pointer. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H |
| #define LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H |
| |
| #include "llvm/Pass.h" |
| #include "llvm/PassRegistry.h" |
| |
| namespace llvm { |
| |
| struct UnifyFunctionExitNodes : public FunctionPass { |
| BasicBlock *ReturnBlock = nullptr; |
| BasicBlock *UnwindBlock = nullptr; |
| BasicBlock *UnreachableBlock; |
| |
| public: |
| static char ID; // Pass identification, replacement for typeid |
| UnifyFunctionExitNodes(); |
| |
| // We can preserve non-critical-edgeness when we unify function exit nodes |
| void getAnalysisUsage(AnalysisUsage &AU) const override; |
| |
| // getReturn|Unwind|UnreachableBlock - Return the new single (or nonexistent) |
| // return, unwind, or unreachable basic blocks in the CFG. |
| // |
| BasicBlock *getReturnBlock() const { return ReturnBlock; } |
| BasicBlock *getUnwindBlock() const { return UnwindBlock; } |
| BasicBlock *getUnreachableBlock() const { return UnreachableBlock; } |
| |
| bool runOnFunction(Function &F) override; |
| }; |
| |
| Pass *createUnifyFunctionExitNodesPass(); |
| |
| } // end namespace llvm |
| |
| #endif // LLVM_TRANSFORMS_UTILS_UNIFYFUNCTIONEXITNODES_H |