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HaohaiWenHaohaiWen
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[llvm-profgen] Support COFF binary (#83972)
Intel Vtune/SEP has supported collecting LBR on Windows and generating perf-script file which is same format as Linux perf script. This patch teaches llvm-profgen to disassemble COFF binary so that we can do Sampling based PGO on Windows.
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7 files changed

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-28
lines changed

7 files changed

+165
-28
lines changed

‎llvm/lib/DebugInfo/Symbolize/Symbolize.cpp

Lines changed: 10 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -628,13 +628,20 @@ LLVMSymbolizer::getOrCreateModuleInfo(const std::string &ModuleName) {
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ObjectPair Objects = ObjectsOrErr.get();
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std::unique_ptr<DIContext> Context;
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// If this is a COFF object containing PDB info, use a PDBContext to
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// symbolize. Otherwise, use DWARF.
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// If this is a COFF object containing PDB info and not containing DWARF
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// section, use a PDBContext to symbolize. Otherwise, use DWARF.
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if (auto CoffObject = dyn_cast<COFFObjectFile>(Objects.first)) {
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const codeview::DebugInfo *DebugInfo;
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StringRef PDBFileName;
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auto EC = CoffObject->getDebugPDBInfo(DebugInfo, PDBFileName);
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if (!EC && DebugInfo != nullptr && !PDBFileName.empty()) {
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// Use DWARF if there're DWARF sections.
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bool HasDwarf =
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llvm::any_of(Objects.first->sections(), [](SectionRef Section) -> bool {
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if (Expected<StringRef> SectionName = Section.getName())
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return SectionName.get() == ".debug_info";
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return false;
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});
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if (!EC && !HasDwarf && DebugInfo != nullptr && !PDBFileName.empty()) {
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using namespace pdb;
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std::unique_ptr<IPDBSession> Session;
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‎llvm/test/tools/llvm-profgen/Inputs/coff-profile.exe

1.55 MB
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‎llvm/test/tools/llvm-profgen/Inputs/coff-profile.perfscript

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,13 @@
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PERF_RECORD_MMAP2 5752/0: [0x7ff70a1b0000(0x640000) @ 0x1000 00:00 0 0]: r-xp c:\Users\haohaiwe\Desktop\coff-profile.exe
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‎llvm/test/tools/llvm-profgen/coff-profile.test

Lines changed: 79 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,79 @@
1+
; RUN: llvm-profgen --format=text --perfscript=%S/Inputs/coff-profile.perfscript --binary=%S/Inputs/coff-profile.exe --output=%t
2+
; RUN: FileCheck %s --input-file %t
3+
4+
CHECK: main:31837:0
5+
CHECK-NEXT: 0: 0
6+
CHECK-NEXT: 3.1: 0
7+
CHECK-NEXT: 3.2: 0
8+
CHECK-NEXT: 8: 0
9+
CHECK-NEXT: 65501: 0
10+
CHECK-NEXT: 1: ??$init@HG@MyNameSpace2@@YAXHPEAG@Z:0
11+
CHECK-NEXT: 1: 0
12+
CHECK-NEXT: 1.1: 0
13+
CHECK-NEXT: 1.2: 0
14+
CHECK-NEXT: 2: 0
15+
CHECK-NEXT: 65514: 0
16+
CHECK-NEXT: 4: ?work1@?$MyClass@GH@MyNameSpace1@@QEAAXQEAGH@Z:3193
17+
CHECK-NEXT: 0: ?work@?$MyClass@GH@MyNameSpace1@@AEAAXQEAGHH@Z:3193
18+
CHECK-NEXT: 1.1: 31
19+
CHECK-NEXT: 1.2: 31
20+
CHECK-NEXT: 2: 31
21+
CHECK-NEXT: 3: 31
22+
CHECK-NEXT: 65530: 0
23+
CHECK-NEXT: 5: ?work2@?$MyClass@GH@MyNameSpace1@@QEAAXQEAGH@Z:28644
24+
CHECK-NEXT: 0: ?work@?$MyClass@GH@MyNameSpace1@@AEAAXQEAGHH@Z:28644
25+
CHECK-NEXT: 1.1: 341
26+
CHECK-NEXT: 1.2: 341
27+
CHECK-NEXT: 2: 341
28+
CHECK-NEXT: 3: 341
29+
CHECK-NEXT: 65530: 0
30+
CHECK-NEXT: 7: ?print@MyNameSpace2@@YAXPEAGH@Z:0
31+
CHECK-NEXT: 1: 0
32+
33+
; Original code
34+
; clang-cl.exe -O2 -gdwarf -gline-tables-only coff-profile.cpp -fuse-ld=lld -Xclang -fdebug-info-for-profiling -link -debug:dwarf
35+
36+
#include <stdio.h>
37+
38+
namespace MyNameSpace1 {
39+
40+
template <typename T1, typename T2> class MyClass {
41+
void work(T1 map[], T2 n, T2 m) {
42+
for (int i = 1; i < n; i++) {
43+
map[i] = map[i - 1] * map[i - 1];
44+
map[i] += (i * map[i - 1]) / m + i % m;
45+
}
46+
}
47+
48+
public:
49+
void work1(T1 map[], T2 n) { work(map, n, 7); }
50+
void work2(T1 map[], T2 n) { work(map, n, 3); }
51+
};
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53+
} // namespace MyNameSpace1
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55+
namespace MyNameSpace2 {
56+
57+
template <typename T1, typename T2> void init(T1 c, T2 *p) {
58+
for (int i = 0; i < c * 1000000; i++) {
59+
p[i] = i / 3 + (i * i) % 3;
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}
61+
}
62+
63+
void print(unsigned short *p, int i) {
64+
printf("%d %d %d\n", p[i * i * 100], p[i * i * 100 + 1], p[i * i * 100 + 2]);
65+
}
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67+
} // namespace MyNameSpace2
68+
69+
unsigned short M[3000000];
70+
int main(int argc, char *argv[]) {
71+
MyNameSpace2::init(argc, M);
72+
MyNameSpace1::MyClass<unsigned short, int> Obj;
73+
for (int i = 0; i <= argc * 10; i++) {
74+
Obj.work1(&M[argc], argc * 100000);
75+
Obj.work2(&M[argc * argc], argc * 1000000);
76+
}
77+
MyNameSpace2::print(M, argc);
78+
return 0;
79+
}

‎llvm/tools/llvm-profgen/PerfReader.cpp

Lines changed: 15 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -408,9 +408,22 @@ PerfScriptReader::convertPerfDataToTrace(ProfiledBinary *Binary,
408408
PerfContent::UnknownContent};
409409
}
410410

411+
static StringRef filename(StringRef Path, bool UseBackSlash) {
412+
llvm::sys::path::Style PathStyle =
413+
UseBackSlash ? llvm::sys::path::Style::windows_backslash
414+
: llvm::sys::path::Style::native;
415+
StringRef FileName = llvm::sys::path::filename(Path, PathStyle);
416+
417+
// In case this file use \r\n as newline.
418+
if (UseBackSlash && FileName.back() == '\r')
419+
return FileName.drop_back();
420+
421+
return FileName;
422+
}
423+
411424
void PerfScriptReader::updateBinaryAddress(const MMapEvent &Event) {
412425
// Drop the event which doesn't belong to user-provided binary
413-
StringRef BinaryName = llvm::sys::path::filename(Event.BinaryPath);
426+
StringRef BinaryName = filename(Event.BinaryPath, Binary->isCOFF());
414427
if (Binary->getName() != BinaryName)
415428
return;
416429

@@ -975,7 +988,7 @@ bool PerfScriptReader::extractMMap2EventForBinary(ProfiledBinary *Binary,
975988
<< format("0x%" PRIx64 ":", MMap.Address) << " \n";
976989
}
977990

978-
StringRef BinaryName = llvm::sys::path::filename(MMap.BinaryPath);
991+
StringRef BinaryName = filename(MMap.BinaryPath, Binary->isCOFF());
979992
return Binary->getName() == BinaryName;
980993
}
981994

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