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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 |