-
Notifications
You must be signed in to change notification settings - Fork 10.7k
/
InstrProf.cpp
366 lines (315 loc) · 12.6 KB
/
InstrProf.cpp
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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
//=-- InstrProf.cpp - Instrumented profiling format support -----------------=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for clang's instrumentation based PGO and
// coverage.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/ProfileData/InstrProf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
using namespace llvm;
namespace {
class InstrProfErrorCategoryType : public std::error_category {
const char *name() const LLVM_NOEXCEPT override { return "llvm.instrprof"; }
std::string message(int IE) const override {
instrprof_error E = static_cast<instrprof_error>(IE);
switch (E) {
case instrprof_error::success:
return "Success";
case instrprof_error::eof:
return "End of File";
case instrprof_error::unrecognized_format:
return "Unrecognized instrumentation profile encoding format";
case instrprof_error::bad_magic:
return "Invalid instrumentation profile data (bad magic)";
case instrprof_error::bad_header:
return "Invalid instrumentation profile data (file header is corrupt)";
case instrprof_error::unsupported_version:
return "Unsupported instrumentation profile format version";
case instrprof_error::unsupported_hash_type:
return "Unsupported instrumentation profile hash type";
case instrprof_error::too_large:
return "Too much profile data";
case instrprof_error::truncated:
return "Truncated profile data";
case instrprof_error::malformed:
return "Malformed instrumentation profile data";
case instrprof_error::unknown_function:
return "No profile data available for function";
case instrprof_error::hash_mismatch:
return "Function control flow change detected (hash mismatch)";
case instrprof_error::count_mismatch:
return "Function basic block count change detected (counter mismatch)";
case instrprof_error::counter_overflow:
return "Counter overflow";
case instrprof_error::value_site_count_mismatch:
return "Function value site count change detected (counter mismatch)";
}
llvm_unreachable("A value of instrprof_error has no message.");
}
};
}
static ManagedStatic<InstrProfErrorCategoryType> ErrorCategory;
const std::error_category &llvm::instrprof_category() {
return *ErrorCategory;
}
namespace llvm {
std::string getPGOFuncName(StringRef RawFuncName,
GlobalValue::LinkageTypes Linkage,
StringRef FileName) {
// Function names may be prefixed with a binary '1' to indicate
// that the backend should not modify the symbols due to any platform
// naming convention. Do not include that '1' in the PGO profile name.
if (RawFuncName[0] == '\1')
RawFuncName = RawFuncName.substr(1);
std::string FuncName = RawFuncName;
if (llvm::GlobalValue::isLocalLinkage(Linkage)) {
// For local symbols, prepend the main file name to distinguish them.
// Do not include the full path in the file name since there's no guarantee
// that it will stay the same, e.g., if the files are checked out from
// version control in different locations.
if (FileName.empty())
FuncName = FuncName.insert(0, "<unknown>:");
else
FuncName = FuncName.insert(0, FileName.str() + ":");
}
return FuncName;
}
std::string getPGOFuncName(const Function &F) {
return getPGOFuncName(F.getName(), F.getLinkage(), F.getParent()->getName());
}
GlobalVariable *createPGOFuncNameVar(Module &M,
GlobalValue::LinkageTypes Linkage,
StringRef FuncName) {
// We generally want to match the function's linkage, but available_externally
// and extern_weak both have the wrong semantics, and anything that doesn't
// need to link across compilation units doesn't need to be visible at all.
if (Linkage == GlobalValue::ExternalWeakLinkage)
Linkage = GlobalValue::LinkOnceAnyLinkage;
else if (Linkage == GlobalValue::AvailableExternallyLinkage)
Linkage = GlobalValue::LinkOnceODRLinkage;
else if (Linkage == GlobalValue::InternalLinkage ||
Linkage == GlobalValue::ExternalLinkage)
Linkage = GlobalValue::PrivateLinkage;
auto *Value = ConstantDataArray::getString(M.getContext(), FuncName, false);
auto FuncNameVar =
new GlobalVariable(M, Value->getType(), true, Linkage, Value,
Twine(getInstrProfNameVarPrefix()) + FuncName);
// Hide the symbol so that we correctly get a copy for each executable.
if (!GlobalValue::isLocalLinkage(FuncNameVar->getLinkage()))
FuncNameVar->setVisibility(GlobalValue::HiddenVisibility);
return FuncNameVar;
}
GlobalVariable *createPGOFuncNameVar(Function &F, StringRef FuncName) {
return createPGOFuncNameVar(*F.getParent(), F.getLinkage(), FuncName);
}
namespace IndexedInstrProf {
uint32_t ValueProfRecord::getHeaderSize(uint32_t NumValueSites) {
uint32_t Size = offsetof(ValueProfRecord, SiteCountArray) +
sizeof(uint8_t) * NumValueSites;
// Round the size to multiple of 8 bytes.
Size = (Size + 7) & ~7;
return Size;
}
uint32_t ValueProfRecord::getSize(uint32_t NumValueSites,
uint32_t NumValueData) {
return getHeaderSize(NumValueSites) +
sizeof(InstrProfValueData) * NumValueData;
}
void ValueProfRecord::deserializeTo(InstrProfRecord &Record,
InstrProfRecord::ValueMapType *VMap) {
Record.reserveSites(Kind, NumValueSites);
InstrProfValueData *ValueData = this->getValueData();
for (uint64_t VSite = 0; VSite < NumValueSites; ++VSite) {
uint8_t ValueDataCount = this->SiteCountArray[VSite];
Record.addValueData(Kind, VSite, ValueData, ValueDataCount, VMap);
ValueData += ValueDataCount;
}
}
void ValueProfRecord::serializeFrom(const InstrProfRecord &Record,
uint32_t ValueKind,
uint32_t NumValueSites) {
Kind = ValueKind;
this->NumValueSites = NumValueSites;
InstrProfValueData *DstVD = getValueData();
for (uint32_t S = 0; S < NumValueSites; S++) {
uint32_t ND = Record.getNumValueDataForSite(ValueKind, S);
SiteCountArray[S] = ND;
std::unique_ptr<InstrProfValueData[]> SrcVD =
Record.getValueForSite(ValueKind, S);
for (uint32_t I = 0; I < ND; I++) {
DstVD[I] = SrcVD[I];
switch (ValueKind) {
case IPVK_IndirectCallTarget:
DstVD[I].Value = ComputeHash(HashType, (const char *)DstVD[I].Value);
break;
default:
llvm_unreachable("value kind not handled !");
}
}
DstVD += ND;
}
}
template <class T>
static T swapToHostOrder(const unsigned char *&D, support::endianness Orig) {
using namespace support;
if (Orig == little)
return endian::readNext<T, little, unaligned>(D);
else
return endian::readNext<T, big, unaligned>(D);
}
// For writing/serializing, Old is the host endianness, and New is
// byte order intended on disk. For Reading/deserialization, Old
// is the on-disk source endianness, and New is the host endianness.
void ValueProfRecord::swapBytes(support::endianness Old,
support::endianness New) {
using namespace support;
if (Old == New)
return;
if (getHostEndianness() != Old) {
sys::swapByteOrder<uint32_t>(NumValueSites);
sys::swapByteOrder<uint32_t>(Kind);
}
uint32_t ND = getNumValueData();
InstrProfValueData *VD = getValueData();
// No need to swap byte array: SiteCountArrray.
for (uint32_t I = 0; I < ND; I++) {
sys::swapByteOrder<uint64_t>(VD[I].Value);
sys::swapByteOrder<uint64_t>(VD[I].Count);
}
if (getHostEndianness() == Old) {
sys::swapByteOrder<uint32_t>(NumValueSites);
sys::swapByteOrder<uint32_t>(Kind);
}
}
uint32_t ValueProfData::getSize(const InstrProfRecord &Record) {
uint32_t TotalSize = sizeof(ValueProfData);
uint32_t NumValueKinds = Record.getNumValueKinds();
if (NumValueKinds == 0)
return TotalSize;
for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; Kind++) {
uint32_t NumValueSites = Record.getNumValueSites(Kind);
if (!NumValueSites)
continue;
TotalSize +=
ValueProfRecord::getSize(NumValueSites, Record.getNumValueData(Kind));
}
return TotalSize;
}
void ValueProfData::deserializeTo(InstrProfRecord &Record,
InstrProfRecord::ValueMapType *VMap) {
if (NumValueKinds == 0)
return;
ValueProfRecord *VR = getFirstValueProfRecord();
for (uint32_t K = 0; K < NumValueKinds; K++) {
VR->deserializeTo(Record, VMap);
VR = VR->getNext();
}
}
static std::unique_ptr<ValueProfData> AllocValueProfData(uint32_t TotalSize) {
return std::unique_ptr<ValueProfData>(new (::operator new(TotalSize))
ValueProfData());
}
std::unique_ptr<ValueProfData>
ValueProfData::serializeFrom(const InstrProfRecord &Record) {
uint32_t TotalSize = getSize(Record);
std::unique_ptr<ValueProfData> VPD = AllocValueProfData(TotalSize);
VPD->TotalSize = TotalSize;
VPD->NumValueKinds = Record.getNumValueKinds();
ValueProfRecord *VR = VPD->getFirstValueProfRecord();
for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; Kind++) {
uint32_t NumValueSites = Record.getNumValueSites(Kind);
if (!NumValueSites)
continue;
VR->serializeFrom(Record, Kind, NumValueSites);
VR = VR->getNext();
}
return VPD;
}
ErrorOr<std::unique_ptr<ValueProfData>>
ValueProfData::getValueProfData(const unsigned char *D,
const unsigned char *const BufferEnd,
support::endianness Endianness) {
using namespace support;
if (D + sizeof(ValueProfData) > BufferEnd)
return instrprof_error::truncated;
const unsigned char *Header = D;
uint32_t TotalSize = swapToHostOrder<uint32_t>(Header, Endianness);
uint32_t NumValueKinds = swapToHostOrder<uint32_t>(Header, Endianness);
if (D + TotalSize > BufferEnd)
return instrprof_error::too_large;
if (NumValueKinds > IPVK_Last + 1)
return instrprof_error::malformed;
// Total size needs to be mulltiple of quadword size.
if (TotalSize % sizeof(uint64_t))
return instrprof_error::malformed;
std::unique_ptr<ValueProfData> VPD = AllocValueProfData(TotalSize);
memcpy(VPD.get(), D, TotalSize);
// Byte swap.
VPD->swapBytesToHost(Endianness);
// Data integrety check:
ValueProfRecord *VR = VPD->getFirstValueProfRecord();
for (uint32_t K = 0; K < VPD->NumValueKinds; K++) {
if (VR->Kind > IPVK_Last)
return instrprof_error::malformed;
VR = VR->getNext();
if ((char *)VR - (char *)VPD.get() > (ptrdiff_t)TotalSize)
return instrprof_error::malformed;
}
return std::move(VPD);
}
void ValueProfData::swapBytesToHost(support::endianness Endianness) {
using namespace support;
if (Endianness == getHostEndianness())
return;
sys::swapByteOrder<uint32_t>(TotalSize);
sys::swapByteOrder<uint32_t>(NumValueKinds);
ValueProfRecord *VR = getFirstValueProfRecord();
for (uint32_t K = 0; K < NumValueKinds; K++) {
VR->swapBytes(Endianness, getHostEndianness());
VR = VR->getNext();
}
}
void ValueProfData::swapBytesFromHost(support::endianness Endianness) {
using namespace support;
if (Endianness == getHostEndianness())
return;
ValueProfRecord *VR = getFirstValueProfRecord();
for (uint32_t K = 0; K < NumValueKinds; K++) {
ValueProfRecord *NVR = VR->getNext();
VR->swapBytes(getHostEndianness(), Endianness);
VR = NVR;
}
sys::swapByteOrder<uint32_t>(TotalSize);
sys::swapByteOrder<uint32_t>(NumValueKinds);
}
ValueProfRecord *ValueProfData::getFirstValueProfRecord() {
return reinterpret_cast<ValueProfRecord *>((char *)this +
sizeof(ValueProfData));
}
uint32_t ValueProfRecord::getNumValueData() const {
uint32_t NumValueData = 0;
for (uint32_t I = 0; I < NumValueSites; I++)
NumValueData += SiteCountArray[I];
return NumValueData;
}
ValueProfRecord *ValueProfRecord::getNext() {
return reinterpret_cast<ValueProfRecord *>((char *)this + getSize());
}
InstrProfValueData *ValueProfRecord::getValueData() {
return reinterpret_cast<InstrProfValueData *>((char *)this +
getHeaderSize(NumValueSites));
}
} // End of IndexedInstrProf namespace.
}