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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- EHPersonalities.h - Compute EH-related information -----------------===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |||
| 9 | #ifndef LLVM_ANALYSIS_EHPERSONALITIES_H |
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| 10 | #define LLVM_ANALYSIS_EHPERSONALITIES_H |
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| 11 | |||
| 12 | #include "llvm/ADT/DenseMap.h" |
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| 13 | #include "llvm/ADT/TinyPtrVector.h" |
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| 14 | |||
| 15 | namespace llvm { |
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| 16 | class BasicBlock; |
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| 17 | class Function; |
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| 18 | class Triple; |
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| 19 | class Value; |
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| 20 | |||
| 21 | enum class EHPersonality { |
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| 22 | Unknown, |
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| 23 | GNU_Ada, |
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| 24 | GNU_C, |
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| 25 | GNU_C_SjLj, |
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| 26 | GNU_CXX, |
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| 27 | GNU_CXX_SjLj, |
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| 28 | GNU_ObjC, |
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| 29 | MSVC_X86SEH, |
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| 30 | MSVC_TableSEH, |
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| 31 | MSVC_CXX, |
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| 32 | CoreCLR, |
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| 33 | Rust, |
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| 34 | Wasm_CXX, |
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| 35 | XL_CXX |
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| 36 | }; |
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| 37 | |||
| 38 | /// See if the given exception handling personality function is one |
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| 39 | /// that we understand. If so, return a description of it; otherwise return |
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| 40 | /// Unknown. |
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| 41 | EHPersonality classifyEHPersonality(const Value *Pers); |
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| 42 | |||
| 43 | StringRef getEHPersonalityName(EHPersonality Pers); |
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| 44 | |||
| 45 | EHPersonality getDefaultEHPersonality(const Triple &T); |
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| 46 | |||
| 47 | /// Returns true if this personality function catches asynchronous |
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| 48 | /// exceptions. |
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| 49 | inline bool isAsynchronousEHPersonality(EHPersonality Pers) { |
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| 50 | // The two SEH personality functions can catch asynch exceptions. We assume |
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| 51 | // unknown personalities don't catch asynch exceptions. |
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| 52 | switch (Pers) { |
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| 53 | case EHPersonality::MSVC_X86SEH: |
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| 54 | case EHPersonality::MSVC_TableSEH: |
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| 55 | return true; |
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| 56 | default: |
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| 57 | return false; |
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| 58 | } |
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| 59 | llvm_unreachable("invalid enum"); |
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| 60 | } |
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| 61 | |||
| 62 | /// Returns true if this is a personality function that invokes |
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| 63 | /// handler funclets (which must return to it). |
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| 64 | inline bool isFuncletEHPersonality(EHPersonality Pers) { |
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| 65 | switch (Pers) { |
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| 66 | case EHPersonality::MSVC_CXX: |
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| 67 | case EHPersonality::MSVC_X86SEH: |
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| 68 | case EHPersonality::MSVC_TableSEH: |
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| 69 | case EHPersonality::CoreCLR: |
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| 70 | return true; |
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| 71 | default: |
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| 72 | return false; |
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| 73 | } |
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| 74 | llvm_unreachable("invalid enum"); |
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| 75 | } |
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| 76 | |||
| 77 | /// Returns true if this personality uses scope-style EH IR instructions: |
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| 78 | /// catchswitch, catchpad/ret, and cleanuppad/ret. |
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| 79 | inline bool isScopedEHPersonality(EHPersonality Pers) { |
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| 80 | switch (Pers) { |
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| 81 | case EHPersonality::MSVC_CXX: |
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| 82 | case EHPersonality::MSVC_X86SEH: |
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| 83 | case EHPersonality::MSVC_TableSEH: |
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| 84 | case EHPersonality::CoreCLR: |
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| 85 | case EHPersonality::Wasm_CXX: |
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| 86 | return true; |
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| 87 | default: |
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| 88 | return false; |
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| 89 | } |
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| 90 | llvm_unreachable("invalid enum"); |
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| 91 | } |
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| 92 | |||
| 93 | /// Return true if this personality may be safely removed if there |
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| 94 | /// are no invoke instructions remaining in the current function. |
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| 95 | inline bool isNoOpWithoutInvoke(EHPersonality Pers) { |
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| 96 | switch (Pers) { |
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| 97 | case EHPersonality::Unknown: |
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| 98 | return false; |
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| 99 | // All known personalities currently have this behavior |
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| 100 | default: |
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| 101 | return true; |
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| 102 | } |
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| 103 | llvm_unreachable("invalid enum"); |
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| 104 | } |
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| 105 | |||
| 106 | bool canSimplifyInvokeNoUnwind(const Function *F); |
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| 107 | |||
| 108 | typedef TinyPtrVector<BasicBlock *> ColorVector; |
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| 109 | |||
| 110 | /// If an EH funclet personality is in use (see isFuncletEHPersonality), |
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| 111 | /// this will recompute which blocks are in which funclet. It is possible that |
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| 112 | /// some blocks are in multiple funclets. Consider this analysis to be |
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| 113 | /// expensive. |
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| 114 | DenseMap<BasicBlock *, ColorVector> colorEHFunclets(Function &F); |
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| 115 | |||
| 116 | } // end namespace llvm |
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| 117 | |||
| 118 | #endif |