1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
//===------- EHFrameSupportImpl.h - JITLink eh-frame utils ------*- 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
//
//===----------------------------------------------------------------------===//
//
// EHFrame registration support for JITLink.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
#define LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
#include "llvm/ExecutionEngine/JITLink/EHFrameSupport.h"
#include "llvm/ExecutionEngine/JITLink/JITLink.h"
#include "llvm/Support/BinaryStreamReader.h"
namespace llvm {
namespace jitlink {
/// A LinkGraph pass that splits blocks in an eh-frame section into sub-blocks
/// representing individual eh-frames.
/// EHFrameSplitter should not be run without EHFrameEdgeFixer, which is
/// responsible for adding FDE-to-CIE edges.
class EHFrameSplitter {
public:
EHFrameSplitter(StringRef EHFrameSectionName);
Error operator()(LinkGraph &G);
private:
Error processBlock(LinkGraph &G, Block &B, LinkGraph::SplitBlockCache &Cache);
StringRef EHFrameSectionName;
};
/// A LinkGraph pass that adds missing FDE-to-CIE, FDE-to-PC and FDE-to-LSDA
/// edges.
class EHFrameEdgeFixer {
public:
EHFrameEdgeFixer(StringRef EHFrameSectionName, unsigned PointerSize,
Edge::Kind Delta64, Edge::Kind Delta32,
Edge::Kind NegDelta32);
Error operator()(LinkGraph &G);
private:
struct AugmentationInfo {
bool AugmentationDataPresent = false;
bool EHDataFieldPresent = false;
uint8_t Fields[4] = {0x0, 0x0, 0x0, 0x0};
};
struct CIEInformation {
CIEInformation() = default;
CIEInformation(Symbol &CIESymbol) : CIESymbol(&CIESymbol) {}
Symbol *CIESymbol = nullptr;
bool FDEsHaveLSDAField = false;
uint8_t FDEPointerEncoding = 0;
uint8_t LSDAPointerEncoding = 0;
};
struct EdgeTarget {
EdgeTarget() = default;
EdgeTarget(const Edge &E) : Target(&E.getTarget()), Addend(E.getAddend()) {}
Symbol *Target = nullptr;
Edge::AddendT Addend = 0;
};
using BlockEdgeMap = DenseMap<Edge::OffsetT, EdgeTarget>;
using CIEInfosMap = DenseMap<orc::ExecutorAddr, CIEInformation>;
struct ParseContext {
ParseContext(LinkGraph &G) : G(G) {}
Expected<CIEInformation *> findCIEInfo(orc::ExecutorAddr Address) {
auto I = CIEInfos.find(Address);
if (I == CIEInfos.end())
return make_error<JITLinkError>("No CIE found at address " +
formatv("{0:x16}", Address));
return &I->second;
}
LinkGraph &G;
CIEInfosMap CIEInfos;
BlockAddressMap AddrToBlock;
SymbolAddressMap AddrToSyms;
};
Error processBlock(ParseContext &PC, Block &B);
Error processCIE(ParseContext &PC, Block &B, size_t RecordOffset,
size_t RecordLength, size_t CIEDeltaFieldOffset);
Error processFDE(ParseContext &PC, Block &B, size_t RecordOffset,
size_t RecordLength, size_t CIEDeltaFieldOffset,
uint32_t CIEDelta, BlockEdgeMap &BlockEdges);
Expected<AugmentationInfo>
parseAugmentationString(BinaryStreamReader &RecordReader);
static bool isSupportedPointerEncoding(uint8_t PointerEncoding);
unsigned getPointerEncodingDataSize(uint8_t PointerEncoding);
Expected<std::pair<orc::ExecutorAddr, Edge::Kind>>
readEncodedPointer(uint8_t PointerEncoding,
orc::ExecutorAddr PointerFieldAddress,
BinaryStreamReader &RecordReader);
Expected<Symbol &> getOrCreateSymbol(ParseContext &PC,
orc::ExecutorAddr Addr);
StringRef EHFrameSectionName;
unsigned PointerSize;
Edge::Kind Delta64;
Edge::Kind Delta32;
Edge::Kind NegDelta32;
};
/// Add a 32-bit null-terminator to the end of the eh-frame section.
class EHFrameNullTerminator {
public:
EHFrameNullTerminator(StringRef EHFrameSectionName);
Error operator()(LinkGraph &G);
private:
static char NullTerminatorBlockContent[];
StringRef EHFrameSectionName;
};
} // end namespace jitlink
} // end namespace llvm
#endif // LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
|
