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[BOLT][DWARF] Improve reporting on missing DWOs (#171506)

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List all required missing DWO files and report a summary with
recommendations on how to proceed.
This commit is contained in:
Maksim Panchenko
2025-12-09 15:46:43 -08:00
committed by GitHub
parent 782f50792f
commit dda715df2d
2 changed files with 38 additions and 5 deletions
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25
bolt/lib/Core/BinaryContext.cpp
View File

@@ -1888,6 +1888,9 @@ void BinaryContext::preprocessDebugInfo() {
preprocessDWODebugInfo();
// Check if required DWO files are missing.
uint64_t NumMissingDWOs = 0;
// Populate MCContext with DWARF files from all units.
StringRef GlobalPrefix = AsmInfo->getPrivateGlobalPrefix();
for (const std::unique_ptr<DWARFUnit> &CU : DwCtx->compile_units()) {
@@ -1909,19 +1912,23 @@ void BinaryContext::preprocessDebugInfo() {
std::optional<MD5::MD5Result> Checksum;
if (LineTable->Prologue.ContentTypes.HasMD5)
Checksum = LineTable->Prologue.FileNames[0].Checksum;
std::optional<const char *> Name =
const char *Name =
dwarf::toString(CU->getUnitDIE().find(dwarf::DW_AT_name), nullptr);
if (std::optional<uint64_t> DWOID = CU->getDWOId()) {
auto Iter = DWOCUs.find(*DWOID);
if (Iter == DWOCUs.end()) {
this->errs() << "BOLT-ERROR: DWO CU was not found for " << Name
<< '\n';
exit(1);
const char *DWOName =
dwarf::toString(CU->getUnitDIE().find(dwarf::DW_AT_dwo_name),
"<missing DW_AT_dwo_name>");
this->errs() << "BOLT-ERROR: unable to load " << DWOName
<< " for DWO_id 0x" << Twine::utohexstr(*DWOID) << '\n';
NumMissingDWOs++;
continue;
}
Name = dwarf::toString(
Iter->second->getUnitDIE().find(dwarf::DW_AT_name), nullptr);
}
BinaryLineTable.setRootFile(CU->getCompilationDir(), *Name, Checksum,
BinaryLineTable.setRootFile(CU->getCompilationDir(), Name, Checksum,
std::nullopt);
}
@@ -1956,6 +1963,14 @@ void BinaryContext::preprocessDebugInfo() {
DwarfVersion));
}
}
if (NumMissingDWOs) {
this->errs() << "BOLT-ERROR: " << NumMissingDWOs
<< " required DWO file(s) not found. Unable to update debug"
" info. Use --comp-dir-override to locate the file(s) or"
" --update-debug-sections=0 to remove debug info\n";
exit(1);
}
}
bool BinaryContext::shouldEmit(const BinaryFunction &Function) const {

18
bolt/test/dwarf5-missing-dwo.c Normal file
View File

@@ -0,0 +1,18 @@
// Check that llvm-bolt correctly reports a missing DWO file while updating
// debug info.
//
// RUN: %clang %cflags -g -dwarf5 -gsplit-dwarf=single -c %s -o %t.o
// RUN: %clang %cflags %t.o -o %t.exe -Wl,-q
// RUN: rm %t.o
// RUN: not llvm-bolt %t.exe -o %t.bolt --update-debug-sections \
// RUN: 2>&1 | FileCheck %s -DDWO=%t.o
//
// Check that llvm-bolt succeeds on the same binary with disabled debug info
// update.
//
// RUN: llvm-bolt %t.exe -o %t.bolt --update-debug-sections=0
// CHECK: BOLT-ERROR: unable to load [[DWO]]
// CHECK-NEXT: BOLT-ERROR: 1 required DWO file(s) not found
int main() { return 0; }