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
|
//===------- 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 generic binary parser for eh-frame sections.
///
/// Adds blocks and symbols representing CIE and FDE entries to a JITLink graph.
///
/// This parser assumes that the user has already verified that the EH-frame's
/// address range does not overlap any other section/symbol, so that generated
/// CIE/FDE records do not overlap other sections/symbols.
class EHFrameBinaryParser {
public:
EHFrameBinaryParser(JITTargetAddress EHFrameAddress, StringRef EHFrameContent,
unsigned PointerSize, support::endianness Endianness);
virtual ~EHFrameBinaryParser() {}
Error addToGraph();
private:
virtual void anchor();
virtual Symbol *getSymbolAtAddress(JITTargetAddress Addr) = 0;
virtual Symbol &createCIERecord(JITTargetAddress RecordAddr,
StringRef RecordContent) = 0;
virtual Expected<Symbol &>
createFDERecord(JITTargetAddress RecordAddr, StringRef RecordContent,
Symbol &CIE, size_t CIEOffset, Symbol &Func,
size_t FuncOffset, Symbol *LSDA, size_t LSDAOffset) = 0;
struct AugmentationInfo {
bool AugmentationDataPresent = false;
bool EHDataFieldPresent = false;
uint8_t Fields[4] = {0x0, 0x0, 0x0, 0x0};
};
Expected<AugmentationInfo> parseAugmentationString();
Expected<JITTargetAddress> readAbsolutePointer();
Error processCIE(size_t RecordOffset, size_t RecordLength);
Error processFDE(size_t RecordOffset, size_t RecordLength,
JITTargetAddress CIEPointerOffset, uint32_t CIEPointer);
struct CIEInformation {
CIEInformation() = default;
CIEInformation(Symbol &CIESymbol) : CIESymbol(&CIESymbol) {}
Symbol *CIESymbol = nullptr;
bool FDEsHaveLSDAField = false;
};
JITTargetAddress EHFrameAddress;
StringRef EHFrameContent;
unsigned PointerSize;
BinaryStreamReader EHFrameReader;
DenseMap<JITTargetAddress, CIEInformation> CIEInfos;
};
} // end namespace jitlink
} // end namespace llvm
#endif // LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
|
