Yi Kong | 8328301 | 2023-12-13 12:57:00 +0900 | [diff] [blame^] | 1 | //===-- EscapeEnumerator.h --------------------------------------*- 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 | // Defines a helper class that enumerates all possible exits from a function, |
| 10 | // including exception handling. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #ifndef LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H |
| 15 | #define LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H |
| 16 | |
| 17 | #include "llvm/IR/Function.h" |
| 18 | #include "llvm/IR/IRBuilder.h" |
| 19 | |
| 20 | namespace llvm { |
| 21 | |
| 22 | class DomTreeUpdater; |
| 23 | |
| 24 | /// EscapeEnumerator - This is a little algorithm to find all escape points |
| 25 | /// from a function so that "finally"-style code can be inserted. In addition |
| 26 | /// to finding the existing return and unwind instructions, it also (if |
| 27 | /// necessary) transforms any call instructions into invokes and sends them to |
| 28 | /// a landing pad. |
| 29 | class EscapeEnumerator { |
| 30 | Function &F; |
| 31 | const char *CleanupBBName; |
| 32 | |
| 33 | Function::iterator StateBB, StateE; |
| 34 | IRBuilder<> Builder; |
| 35 | bool Done = false; |
| 36 | bool HandleExceptions; |
| 37 | |
| 38 | DomTreeUpdater *DTU; |
| 39 | |
| 40 | public: |
| 41 | EscapeEnumerator(Function &F, const char *N = "cleanup", |
| 42 | bool HandleExceptions = true, DomTreeUpdater *DTU = nullptr) |
| 43 | : F(F), CleanupBBName(N), StateBB(F.begin()), StateE(F.end()), |
| 44 | Builder(F.getContext()), HandleExceptions(HandleExceptions), DTU(DTU) {} |
| 45 | |
| 46 | IRBuilder<> *Next(); |
| 47 | }; |
| 48 | |
| 49 | } |
| 50 | |
| 51 | #endif // LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H |