LLVM 19.0.0git
CVRecord.h
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1//===- CVRecord.h -----------------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_DEBUGINFO_CODEVIEW_CVRECORD_H
10#define LLVM_DEBUGINFO_CODEVIEW_CVRECORD_H
11
12#include "llvm/ADT/ArrayRef.h"
18#include "llvm/Support/Endian.h"
19#include "llvm/Support/Error.h"
20#include <cstdint>
21
22namespace llvm {
23
24namespace codeview {
25
26/// CVRecord is a fat pointer (base + size pair) to a symbol or type record.
27/// Carrying the size separately instead of trusting the size stored in the
28/// record prefix provides some extra safety and flexibility.
29template <typename Kind> class CVRecord {
30public:
31 CVRecord() = default;
32
34
35 CVRecord(const RecordPrefix *P, size_t Size)
36 : RecordData(reinterpret_cast<const uint8_t *>(P), Size) {}
37
38 bool valid() const { return kind() != Kind(0); }
39
40 uint32_t length() const { return RecordData.size(); }
41
42 Kind kind() const {
43 if (RecordData.size() < sizeof(RecordPrefix))
44 return Kind(0);
45 return static_cast<Kind>(static_cast<uint16_t>(
46 reinterpret_cast<const RecordPrefix *>(RecordData.data())->RecordKind));
47 }
48
49 ArrayRef<uint8_t> data() const { return RecordData; }
50
52 return StringRef(reinterpret_cast<const char *>(RecordData.data()),
54 }
55
57 return RecordData.drop_front(sizeof(RecordPrefix));
58 }
59
61};
62
63// There are two kinds of codeview records: type and symbol records.
66
67template <typename Record, typename Func>
69 while (!StreamBuffer.empty()) {
70 if (StreamBuffer.size() < sizeof(RecordPrefix))
71 return make_error<CodeViewError>(cv_error_code::corrupt_record);
72
73 const RecordPrefix *Prefix =
74 reinterpret_cast<const RecordPrefix *>(StreamBuffer.data());
75
76 size_t RealLen = Prefix->RecordLen + 2;
77 if (StreamBuffer.size() < RealLen)
78 return make_error<CodeViewError>(cv_error_code::corrupt_record);
79
80 ArrayRef<uint8_t> Data = StreamBuffer.take_front(RealLen);
81 StreamBuffer = StreamBuffer.drop_front(RealLen);
82
83 Record R(Data);
84 if (auto EC = F(R))
85 return EC;
86 }
87 return Error::success();
88}
89
90/// Read a complete record from a stream at a random offset.
91template <typename Kind>
94 const RecordPrefix *Prefix = nullptr;
95 BinaryStreamReader Reader(Stream);
96 Reader.setOffset(Offset);
97
98 if (auto EC = Reader.readObject(Prefix))
99 return std::move(EC);
100 if (Prefix->RecordLen < 2)
101 return make_error<CodeViewError>(cv_error_code::corrupt_record);
102
103 Reader.setOffset(Offset);
104 ArrayRef<uint8_t> RawData;
105 if (auto EC = Reader.readBytes(RawData, Prefix->RecordLen + sizeof(uint16_t)))
106 return std::move(EC);
107 return codeview::CVRecord<Kind>(RawData);
108}
109
110} // end namespace codeview
111
112template <typename Kind>
113struct VarStreamArrayExtractor<codeview::CVRecord<Kind>> {
116 auto ExpectedRec = codeview::readCVRecordFromStream<Kind>(Stream, 0);
117 if (!ExpectedRec)
118 return ExpectedRec.takeError();
119 Item = *ExpectedRec;
120 Len = ExpectedRec->length();
121 return Error::success();
122 }
123};
124
125namespace codeview {
129} // namespace codeview
130
131} // end namespace llvm
132
133#endif // LLVM_DEBUGINFO_CODEVIEW_CVRECORD_H
aarch64 promote const
uint64_t Size
#define F(x, y, z)
Definition: MD5.cpp:55
#define P(N)
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory),...
Definition: ArrayRef.h:41
ArrayRef< T > take_front(size_t N=1) const
Return a copy of *this with only the first N elements.
Definition: ArrayRef.h:228
ArrayRef< T > drop_front(size_t N=1) const
Drop the first N elements of the array.
Definition: ArrayRef.h:204
size_t size() const
size - Get the array size.
Definition: ArrayRef.h:165
bool empty() const
empty - Check if the array is empty.
Definition: ArrayRef.h:160
const T * data() const
Definition: ArrayRef.h:162
Provides read only access to a subclass of BinaryStream.
Error readObject(const T *&Dest)
Get a pointer to an object of type T from the underlying stream, as if by memcpy, and store the resul...
Error readBytes(ArrayRef< uint8_t > &Buffer, uint32_t Size)
Read Size bytes from the underlying stream at the current offset and and set Buffer to the resulting ...
void setOffset(uint64_t Off)
BinaryStreamRef is to BinaryStream what ArrayRef is to an Array.
Lightweight error class with error context and mandatory checking.
Definition: Error.h:160
static ErrorSuccess success()
Create a success value.
Definition: Error.h:334
Tagged union holding either a T or a Error.
Definition: Error.h:474
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
CVRecord is a fat pointer (base + size pair) to a symbol or type record.
Definition: CVRecord.h:29
CVRecord(ArrayRef< uint8_t > Data)
Definition: CVRecord.h:33
bool valid() const
Definition: CVRecord.h:38
StringRef str_data() const
Definition: CVRecord.h:51
CVRecord(const RecordPrefix *P, size_t Size)
Definition: CVRecord.h:35
ArrayRef< uint8_t > data() const
Definition: CVRecord.h:49
Kind kind() const
Definition: CVRecord.h:42
ArrayRef< uint8_t > RecordData
Definition: CVRecord.h:60
ArrayRef< uint8_t > content() const
Definition: CVRecord.h:56
uint32_t length() const
Definition: CVRecord.h:40
A range adaptor for a pair of iterators.
Error forEachCodeViewRecord(ArrayRef< uint8_t > StreamBuffer, Func F)
Definition: CVRecord.h:68
Expected< CVRecord< Kind > > readCVRecordFromStream(BinaryStreamRef Stream, uint32_t Offset)
Read a complete record from a stream at a random offset.
Definition: CVRecord.h:92
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
@ Offset
Definition: DWP.cpp:456
Error operator()(BinaryStreamRef Stream, uint32_t &Len, codeview::CVRecord< Kind > &Item)
Definition: CVRecord.h:114
VarStreamArrayExtractor is intended to be specialized to provide customized extraction logic.