Revert "[LLD] [COFF] Fix linking MSVC generated implib header objects" #123877
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@llvm/pr-subscribers-llvm-binary-utilities @llvm/pr-subscribers-lld-coff Author: Thurston Dang (thurstond) ChangesReverts llvm/llvm-project#122811 due to buildbot breakage e.g., https://lab.llvm.org/buildbot/#/builders/52/builds/5421/steps/11/logs/stdio ASan output from local re-run: Full diff: https://github.com/llvm/llvm-project/pull/123877.diff 4 Files Affected:
diff --git a/lld/COFF/InputFiles.cpp b/lld/COFF/InputFiles.cpp
index 74883ac9e7578c..5ee73d4dc4f8b7 100644
--- a/lld/COFF/InputFiles.cpp
+++ b/lld/COFF/InputFiles.cpp
@@ -458,16 +458,9 @@ Symbol *ObjFile::createRegular(COFFSymbolRef sym) {
return nullptr;
return symtab.addUndefined(name, this, false);
}
- if (sc) {
- const coff_symbol_generic *symGen = sym.getGeneric();
- if (sym.isSection()) {
- auto *customSymGen = make<coff_symbol_generic>(*symGen);
- customSymGen->Value = 0;
- symGen = customSymGen;
- }
+ if (sc)
return make<DefinedRegular>(this, /*Name*/ "", /*IsCOMDAT*/ false,
- /*IsExternal*/ false, symGen, sc);
- }
+ /*IsExternal*/ false, sym.getGeneric(), sc);
return nullptr;
}
@@ -762,23 +755,15 @@ std::optional<Symbol *> ObjFile::createDefined(
memset(hdr, 0, sizeof(*hdr));
strncpy(hdr->Name, name.data(),
std::min(name.size(), (size_t)COFF::NameSize));
- // The Value field in a section symbol may contain the characteristics,
- // or it may be zero, where we make something up (that matches what is
- // used in .idata sections in the regular object files in import libraries).
- if (sym.getValue())
- hdr->Characteristics = sym.getValue() | IMAGE_SCN_ALIGN_4BYTES;
- else
- hdr->Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA |
- IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE |
- IMAGE_SCN_ALIGN_4BYTES;
+ // We have no idea what characteristics should be assumed here; pick
+ // a default. This matches what is used for .idata sections in the regular
+ // object files in import libraries.
+ hdr->Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ |
+ IMAGE_SCN_MEM_WRITE | IMAGE_SCN_ALIGN_4BYTES;
auto *sc = make<SectionChunk>(this, hdr);
chunks.push_back(sc);
-
- coff_symbol_generic *symGen = make<coff_symbol_generic>(*sym.getGeneric());
- // Ignore the Value offset of these symbols, as it may be a bitmask.
- symGen->Value = 0;
return make<DefinedRegular>(this, /*name=*/"", /*isCOMDAT=*/false,
- /*isExternal=*/false, symGen, sc);
+ /*isExternal=*/false, sym.getGeneric(), sc);
}
if (llvm::COFF::isReservedSectionNumber(sectionNumber))
diff --git a/lld/test/COFF/empty-section-decl.yaml b/lld/test/COFF/empty-section-decl.yaml
index 12fe6d44ebb832..320df340000289 100644
--- a/lld/test/COFF/empty-section-decl.yaml
+++ b/lld/test/COFF/empty-section-decl.yaml
@@ -6,7 +6,7 @@
# RUN: FileCheck %s --check-prefix=MAP < %t.map
# CHECK: Contents of section .itest:
-# CHECK-NEXT: 180001000 0c100000 0c100000 00000000 01000000
+# CHECK-NEXT: 180001000 0c100080 01000000 00000000 01000000
# MAP: 00001000 0000000a 4 {{.*}}:(.itest$2)
# MAP: 00001000 00000000 0 .itest$2
@@ -28,10 +28,7 @@ sections:
Relocations:
- VirtualAddress: 0
SymbolName: '.itest$4'
- Type: IMAGE_REL_AMD64_ADDR32NB
- - VirtualAddress: 4
- SymbolName: '.itest$6'
- Type: IMAGE_REL_AMD64_ADDR32NB
+ Type: IMAGE_REL_AMD64_ADDR64
- Name: '.itest$6'
Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ, IMAGE_SCN_MEM_WRITE ]
Alignment: 2
@@ -45,13 +42,13 @@ symbols:
ComplexType: IMAGE_SYM_DTYPE_NULL
StorageClass: IMAGE_SYM_CLASS_SECTION
- Name: '.itest$6'
- Value: 3221225536
+ Value: 0
SectionNumber: 2
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_NULL
- StorageClass: IMAGE_SYM_CLASS_SECTION
+ StorageClass: IMAGE_SYM_CLASS_STATIC
- Name: '.itest$4'
- Value: 3221225536
+ Value: 0
SectionNumber: 0
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_NULL
diff --git a/llvm/include/llvm/Object/COFF.h b/llvm/include/llvm/Object/COFF.h
index 3d0738c4090497..4de2c680f57b1a 100644
--- a/llvm/include/llvm/Object/COFF.h
+++ b/llvm/include/llvm/Object/COFF.h
@@ -383,8 +383,8 @@ class COFFSymbolRef {
}
bool isCommon() const {
- return isExternal() && getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED &&
- getValue() != 0;
+ return (isExternal() || isSection()) &&
+ getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED && getValue() != 0;
}
bool isUndefined() const {
@@ -393,7 +393,8 @@ class COFFSymbolRef {
}
bool isEmptySectionDeclaration() const {
- return isSection() && getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED;
+ return isSection() && getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED &&
+ getValue() == 0;
}
bool isWeakExternal() const {
diff --git a/llvm/test/Object/coff-sec-sym.test b/llvm/test/Object/coff-sec-sym.test
new file mode 100644
index 00000000000000..0b7117250150de
--- /dev/null
+++ b/llvm/test/Object/coff-sec-sym.test
@@ -0,0 +1,20 @@
+# Check that section symbol (IMAGE_SYM_CLASS_SECTION) is listed as common symbol.
+
+# RUN: yaml2obj %s -o %t.obj
+# RUN: llvm-nm %t.obj | FileCheck %s
+
+# CHECK: 00000001 C foo
+
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: [ ]
+sections:
+symbols:
+ - Name: foo
+ Value: 1
+ SectionNumber: 0
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_SECTION
+...
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Reverts #122811 due to buildbot breakage e.g., https://lab.llvm.org/buildbot/#/builders/52/builds/5421/steps/11/logs/stdio
ASan output from local re-run: