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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
//===- xray-log-reader.cc - XRay Log Reader Implementation ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// XRay log reader implementation.
//
//===----------------------------------------------------------------------===//
#include <sys/types.h>
#include "xray-log-reader.h"
#include "xray-record-yaml.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/FileSystem.h"
using namespace llvm;
using namespace llvm::xray;
using llvm::yaml::Input;
LogReader::LogReader(
StringRef Filename, Error &Err, bool Sort,
std::function<Error(StringRef, XRayFileHeader &, std::vector<XRayRecord> &)>
Loader) {
ErrorAsOutParameter Guard(&Err);
int Fd;
if (auto EC = sys::fs::openFileForRead(Filename, Fd)) {
Err = make_error<StringError>(
Twine("Cannot read log from '") + Filename + "'", EC);
return;
}
uint64_t FileSize;
if (auto EC = sys::fs::file_size(Filename, FileSize)) {
Err = make_error<StringError>(
Twine("Cannot read log from '") + Filename + "'", EC);
return;
}
std::error_code EC;
sys::fs::mapped_file_region MappedFile(
Fd, sys::fs::mapped_file_region::mapmode::readonly, FileSize, 0, EC);
if (EC) {
Err = make_error<StringError>(
Twine("Cannot read log from '") + Filename + "'", EC);
return;
}
if (auto E = Loader(StringRef(MappedFile.data(), MappedFile.size()),
FileHeader, Records)) {
Err = std::move(E);
return;
}
if (Sort)
std::sort(
Records.begin(), Records.end(),
[](const XRayRecord &L, const XRayRecord &R) { return L.TSC < R.TSC; });
}
Error llvm::xray::NaiveLogLoader(StringRef Data, XRayFileHeader &FileHeader,
std::vector<XRayRecord> &Records) {
// FIXME: Maybe deduce whether the data is little or big-endian using some
// magic bytes in the beginning of the file?
// First 32 bytes of the file will always be the header. We assume a certain
// format here:
//
// (2) uint16 : version
// (2) uint16 : type
// (4) uint32 : bitfield
// (8) uint64 : cycle frequency
// (16) - : padding
//
if (Data.size() < 32)
return make_error<StringError>(
"Not enough bytes for an XRay log.",
std::make_error_code(std::errc::invalid_argument));
if (Data.size() - 32 == 0 || Data.size() % 32 != 0)
return make_error<StringError>(
"Invalid-sized XRay data.",
std::make_error_code(std::errc::invalid_argument));
DataExtractor HeaderExtractor(Data, true, 8);
uint32_t OffsetPtr = 0;
FileHeader.Version = HeaderExtractor.getU16(&OffsetPtr);
FileHeader.Type = HeaderExtractor.getU16(&OffsetPtr);
uint32_t Bitfield = HeaderExtractor.getU32(&OffsetPtr);
FileHeader.ConstantTSC = Bitfield & 1uL;
FileHeader.NonstopTSC = Bitfield & 1uL << 1;
FileHeader.CycleFrequency = HeaderExtractor.getU64(&OffsetPtr);
if (FileHeader.Version != 1)
return make_error<StringError>(
Twine("Unsupported XRay file version: ") + Twine(FileHeader.Version),
std::make_error_code(std::errc::invalid_argument));
// Each record after the header will be 32 bytes, in the following format:
//
// (2) uint16 : record type
// (1) uint8 : cpu id
// (1) uint8 : type
// (4) sint32 : function id
// (8) uint64 : tsc
// (4) uint32 : thread id
// (12) - : padding
for (auto S = Data.drop_front(32); !S.empty(); S = S.drop_front(32)) {
DataExtractor RecordExtractor(S, true, 8);
uint32_t OffsetPtr = 0;
Records.emplace_back();
auto &Record = Records.back();
Record.RecordType = RecordExtractor.getU16(&OffsetPtr);
Record.CPU = RecordExtractor.getU8(&OffsetPtr);
auto Type = RecordExtractor.getU8(&OffsetPtr);
switch (Type) {
case 0:
Record.Type = RecordTypes::ENTER;
break;
case 1:
Record.Type = RecordTypes::EXIT;
break;
default:
return make_error<StringError>(
Twine("Unknown record type '") + Twine(int{Type}) + "'",
std::make_error_code(std::errc::protocol_error));
}
Record.FuncId = RecordExtractor.getSigned(&OffsetPtr, sizeof(int32_t));
Record.TSC = RecordExtractor.getU64(&OffsetPtr);
Record.TId = RecordExtractor.getU32(&OffsetPtr);
}
return Error::success();
}
Error llvm::xray::YAMLLogLoader(StringRef Data, XRayFileHeader &FileHeader,
std::vector<XRayRecord> &Records) {
// Load the documents from the MappedFile.
YAMLXRayTrace Trace;
Input In(Data);
In >> Trace;
if (In.error())
return make_error<StringError>("Failed loading YAML Data.", In.error());
FileHeader.Version = Trace.Header.Version;
FileHeader.Type = Trace.Header.Type;
FileHeader.ConstantTSC = Trace.Header.ConstantTSC;
FileHeader.NonstopTSC = Trace.Header.NonstopTSC;
FileHeader.CycleFrequency = Trace.Header.CycleFrequency;
if (FileHeader.Version != 1)
return make_error<StringError>(
Twine("Unsupported XRay file version: ") + Twine(FileHeader.Version),
std::make_error_code(std::errc::invalid_argument));
Records.clear();
std::transform(Trace.Records.begin(), Trace.Records.end(),
std::back_inserter(Records), [&](const YAMLXRayRecord &R) {
return XRayRecord{R.RecordType, R.CPU, R.Type,
R.FuncId, R.TSC, R.TId};
});
return Error::success();
}
|
