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[LLD][COFF] Make /wholearchive thin-archive member identifiers consistent #145487

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Merged
merged 5 commits into from
Jul 22, 2025
Merged

[LLD][COFF] Make /wholearchive thin-archive member identifiers consistent #145487

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7c8c158
[LLD][COFF] Make /wholearchive thin-archive member identifiers consis…
bd1976bris Jun 24, 2025
7df4364
Account for spaces in paths from lit substitutions
bd1976bris Jul 21, 2025
741543e
Remove duplicated command line argument in one of the test-cases.
bd1976bris Jul 21, 2025
c244331
Make FileCheck argument order consistent
bd1976bris Jul 21, 2025
ba737e0
Use common function to add thin archive members. Improve comment expl…
bd1976bris Jul 21, 2025
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24 changes: 17 additions & 7 deletions lld/COFF/Driver.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -274,8 +274,13 @@ void LinkerDriver::addBuffer(std::unique_ptr<MemoryBuffer> mb,
make<std::unique_ptr<Archive>>(std::move(file)); // take ownership

int memberIndex = 0;
for (MemoryBufferRef m : getArchiveMembers(ctx, archive))
addArchiveBuffer(m, "<whole-archive>", filename, memberIndex++);
for (MemoryBufferRef m : getArchiveMembers(ctx, archive)) {
if (!archive->isThin())
addArchiveBuffer(m, "<whole-archive>", filename, memberIndex++);
else
addThinArchiveBuffer(m, "<whole-archive>");
}

return;
}
addFile(make<ArchiveFile>(ctx, mbref));
Expand Down Expand Up @@ -386,6 +391,14 @@ void LinkerDriver::addArchiveBuffer(MemoryBufferRef mb, StringRef symName,
Log(ctx) << "Loaded " << obj << " for " << symName;
}

void LinkerDriver::addThinArchiveBuffer(MemoryBufferRef mb, StringRef symName) {
// Pass an empty string as the archive name and an offset of 0 so that
// the original filename is used as the buffer identifier. This is
// useful for DTLTO, where having the member identifier be the actual
// path on disk enables distribution of bitcode files during ThinLTO.
addArchiveBuffer(mb, symName, /*parentName=*/"", /*OffsetInArchive=*/0);
}

void LinkerDriver::enqueueArchiveMember(const Archive::Child &c,
const Archive::Symbol &sym,
StringRef parentName) {
Expand Down Expand Up @@ -422,11 +435,8 @@ void LinkerDriver::enqueueArchiveMember(const Archive::Child &c,
reportBufferError(errorCodeToError(mbOrErr.second), childName);
llvm::TimeTraceScope timeScope("Archive: ",
mbOrErr.first->getBufferIdentifier());
// Pass empty string as archive name so that the original filename is
// used as the buffer identifier.
ctx.driver.addArchiveBuffer(takeBuffer(std::move(mbOrErr.first)),
toCOFFString(ctx, sym), "",
/*OffsetInArchive=*/0);
ctx.driver.addThinArchiveBuffer(takeBuffer(std::move(mbOrErr.first)),
toCOFFString(ctx, sym));
});
}

Expand Down
1 change: 1 addition & 0 deletions lld/COFF/Driver.h
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Original file line number Diff line number Diff line change
Expand Up @@ -173,6 +173,7 @@ class LinkerDriver {
bool lazy);
void addArchiveBuffer(MemoryBufferRef mbref, StringRef symName,
StringRef parentName, uint64_t offsetInArchive);
void addThinArchiveBuffer(MemoryBufferRef mbref, StringRef symName);

void enqueueTask(std::function<void()> task);
bool run();
Expand Down
39 changes: 25 additions & 14 deletions lld/test/COFF/thin-archive.s
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Original file line number Diff line number Diff line change
Expand Up @@ -22,23 +22,34 @@
# SYMTAB: ?f@@YAHXZ in
# NO-SYMTAB-NOT: ?f@@YAHXZ in

# RUN: lld-link /entry:main %t.main.obj %t.lib /out:%t.exe 2>&1 | \
# RUN: FileCheck --allow-empty %s
# RUN: lld-link /entry:main %t.main.obj %t_thin.lib /out:%t.exe 2>&1 | \
# RUN: FileCheck --allow-empty %s
# RUN: lld-link /entry:main %t.main.obj /wholearchive:%t_thin.lib /out:%t.exe 2>&1 | \
# RUN: FileCheck --allow-empty %s
# RUN: echo "/entry:main \"%t.main.obj\" /out:\"%t.exe\"" > %t.rsp

# RUN: lld-link @%t.rsp %t.lib /verbose 2>&1 | \
# RUN: FileCheck %s --check-prefix=LOAD_NON_THIN
# RUN: lld-link @%t.rsp %t_thin.lib /verbose 2>&1 | \
# RUN: FileCheck %s --check-prefix=LOAD_THIN_SYM
# RUN: lld-link @%t.rsp /wholearchive:%t_thin.lib /verbose 2>&1 | \
# RUN: FileCheck %s --check-prefix=LOAD_THIN_WHOLE
# RUN: lld-link @%t.rsp /wholearchive %t_thin.lib /verbose 2>&1 | \
# RUN: FileCheck %s --check-prefix=LOAD_THIN_WHOLE

# LOAD_NON_THIN: Loaded {{.*}}.lib({{.*}}.obj) for int __cdecl f(void)
# LOAD_THIN_SYM: Loaded {{.*}}.obj for int __cdecl f(void)
# LOAD_THIN_WHOLE: Loaded {{.*}}.obj for <whole-archive>

# RUN: rm %t.lib.obj
# RUN: lld-link /entry:main %t.main.obj %t.lib /out:%t.exe 2>&1 | \
# RUN: FileCheck --allow-empty %s
# RUN: env LLD_IN_TEST=1 not lld-link /entry:main %t.main.obj %t_thin.lib \
# RUN: /out:%t.exe 2>&1 | FileCheck --check-prefix=NOOBJ %s
# RUN: env LLD_IN_TEST=1 not lld-link /entry:main %t.main.obj %t_thin.lib /out:%t.exe \
# RUN: /demangle:no 2>&1 | FileCheck --check-prefix=NOOBJNODEMANGLE %s

# CHECK-NOT: error: could not get the buffer for the member defining
# RUN: lld-link @%t.rsp %t.lib 2>&1 | \
# RUN: FileCheck %s --check-prefix=ERR --allow-empty
# RUN: env LLD_IN_TEST=1 not lld-link @%t.rsp %t_thin.lib 2>&1 | \
# RUN: FileCheck %s --check-prefix=NOOBJ
# RUN: env LLD_IN_TEST=1 not lld-link @%t.rsp /wholearchive:%t_thin.lib 2>&1 | \
# RUN: FileCheck %s --check-prefix=NOOBJWHOLE
# RUN: env LLD_IN_TEST=1 not lld-link @%t.rsp %t_thin.lib /demangle:no 2>&1 | \
# RUN: FileCheck %s --check-prefix=NOOBJNODEMANGLE

# ERR-NOT: error: could not get the buffer for the member defining
# NOOBJ: error: could not get the buffer for the member defining symbol int __cdecl f(void): {{.*}}.lib({{.*}}.lib.obj):
# NOOBJWHOLE: error: {{.*}}.lib: could not get the buffer for a child of the archive: '{{.*}}.obj'
# NOOBJNODEMANGLE: error: could not get the buffer for the member defining symbol ?f@@YAHXZ: {{.*}}.lib({{.*}}.lib.obj):

.text
Expand Down
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