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1 //===------- EHFrameSupportImpl.h - JITLink eh-frame utils ------*- C++ -*-===//
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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 //
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9 // EHFrame registration support for JITLink.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #ifndef LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
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14 #define LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
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15
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16 #include "llvm/ExecutionEngine/JITLink/EHFrameSupport.h"
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17
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18 #include "llvm/ExecutionEngine/JITLink/JITLink.h"
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19 #include "llvm/Support/BinaryStreamReader.h"
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20
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21 namespace llvm {
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22 namespace jitlink {
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23
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24 /// A LinkGraph pass that splits blocks in an eh-frame section into sub-blocks
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25 /// representing individual eh-frames.
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26 /// EHFrameSplitter should not be run without EHFrameEdgeFixer, which is
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27 /// responsible for adding FDE-to-CIE edges.
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28 class EHFrameSplitter {
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29 public:
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30 EHFrameSplitter(StringRef EHFrameSectionName);
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31 Error operator()(LinkGraph &G);
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32
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33 private:
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34 Error processBlock(LinkGraph &G, Block &B, LinkGraph::SplitBlockCache &Cache);
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35
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36 StringRef EHFrameSectionName;
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37 };
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38
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39 /// A LinkGraph pass that adds missing FDE-to-CIE, FDE-to-PC and FDE-to-LSDA
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40 /// edges.
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41 class EHFrameEdgeFixer {
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42 public:
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43 EHFrameEdgeFixer(StringRef EHFrameSectionName, Edge::Kind FDEToCIE,
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44 Edge::Kind FDEToPCBegin, Edge::Kind FDEToLSDA);
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45 Error operator()(LinkGraph &G);
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46
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47 private:
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48
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49 struct AugmentationInfo {
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50 bool AugmentationDataPresent = false;
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51 bool EHDataFieldPresent = false;
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52 uint8_t Fields[4] = {0x0, 0x0, 0x0, 0x0};
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53 };
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54
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55 struct CIEInformation {
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56 CIEInformation() = default;
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57 CIEInformation(Symbol &CIESymbol) : CIESymbol(&CIESymbol) {}
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58 Symbol *CIESymbol = nullptr;
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59 bool FDEsHaveLSDAField = false;
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60 };
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61
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62 struct EdgeTarget {
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63 EdgeTarget() = default;
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64 EdgeTarget(const Edge &E) : Target(&E.getTarget()), Addend(E.getAddend()) {}
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65
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66 Symbol *Target = nullptr;
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67 Edge::AddendT Addend = 0;
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68 };
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69
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70 using BlockEdgeMap = DenseMap<Edge::OffsetT, EdgeTarget>;
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71 using CIEInfosMap = DenseMap<JITTargetAddress, CIEInformation>;
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72
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73 struct ParseContext {
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74 ParseContext(LinkGraph &G) : G(G) {}
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75
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76 Expected<CIEInformation *> findCIEInfo(JITTargetAddress Address) {
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77 auto I = CIEInfos.find(Address);
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78 if (I == CIEInfos.end())
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79 return make_error<JITLinkError>("No CIE found at address " +
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80 formatv("{0:x16}", Address));
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81 return &I->second;
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82 }
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83
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84 LinkGraph &G;
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85 CIEInfosMap CIEInfos;
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86 BlockAddressMap AddrToBlock;
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87 SymbolAddressMap AddrToSyms;
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88 };
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89
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90 Error processBlock(ParseContext &PC, Block &B);
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91 Error processCIE(ParseContext &PC, Block &B, size_t RecordOffset,
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92 size_t RecordLength, size_t CIEDeltaFieldOffset);
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93 Error processFDE(ParseContext &PC, Block &B, size_t RecordOffset,
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94 size_t RecordLength, size_t CIEDeltaFieldOffset,
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95 uint32_t CIEDelta, BlockEdgeMap &BlockEdges);
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96
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97 Expected<AugmentationInfo>
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98 parseAugmentationString(BinaryStreamReader &RecordReader);
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99 Expected<JITTargetAddress>
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100 readAbsolutePointer(LinkGraph &G, BinaryStreamReader &RecordReader);
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101 Expected<Symbol &> getOrCreateSymbol(ParseContext &PC, JITTargetAddress Addr);
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102
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103 StringRef EHFrameSectionName;
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104 Edge::Kind FDEToCIE;
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105 Edge::Kind FDEToPCBegin;
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106 Edge::Kind FDEToLSDA;
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107 };
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108
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109 } // end namespace jitlink
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110 } // end namespace llvm
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111
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112 #endif // LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
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