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Revert "COFF: Emit all MCSymbols rather than filtering out some of them"

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This reverts commit r190888, to fix PR17967.  The original change wasn't
the right way to get @feat.00 into the object file.  The right fix is to
make @feat.00 be a global symbol.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195053 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2013-11-18 23:08:12 +00:00
parent 940267e7f2
commit a7b7a7d629
5 changed files with 34 additions and 12 deletions
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21
lib/MC/WinCOFFObjectWriter.cpp
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@ -154,6 +154,8 @@ public:
void MakeSymbolReal(COFFSymbol &S, size_t Index);
void MakeSectionReal(COFFSection &S, size_t Number);
bool ExportSymbol(MCSymbolData const &SymbolData, MCAssembler &Asm);
bool IsPhysicalSection(COFFSection *S);
// Entity writing methods.
@ -503,6 +505,18 @@ void WinCOFFObjectWriter::MakeSymbolReal(COFFSymbol &S, size_t Index) {
S.Index = Index;
}
bool WinCOFFObjectWriter::ExportSymbol(MCSymbolData const &SymbolData,
MCAssembler &Asm) {
// This doesn't seem to be right. Strings referred to from the .data section
// need symbols so they can be linked to code in the .text section right?
// return Asm.isSymbolLinkerVisible (&SymbolData);
// For now, all non-variable symbols are exported,
// the linker will sort the rest out for us.
return SymbolData.isExternal() || !SymbolData.getSymbol().isVariable();
}
bool WinCOFFObjectWriter::IsPhysicalSection(COFFSection *S) {
return (S->Header.Characteristics
& COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0;
@ -605,8 +619,11 @@ void WinCOFFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
for (MCAssembler::const_symbol_iterator i = Asm.symbol_begin(),
e = Asm.symbol_end();
i != e; i++)
DefineSymbol(*i, Asm, Layout);
i != e; i++) {
if (ExportSymbol(*i, Asm)) {
DefineSymbol(*i, Asm, Layout);
}
}
}
void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,

1
lib/Target/X86/X86AsmPrinter.cpp
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@ -535,6 +535,7 @@ void X86AsmPrinter::EmitStartOfAsmFile(Module &M) {
// cause the process to terminate immediately. LLVM does not know how to
// register any SEH handlers, so its object files should be safe.
S->setAbsolute();
OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
OutStreamer.EmitAssignment(
S, MCConstantExpr::Create(int64_t(1), MMI->getContext()));
}

11
test/MC/COFF/alias.s
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@ -45,15 +45,6 @@ weak_aliased_to_external = external2
// CHECK-NEXT: AuxSymbolCount: 0
// CHECK-NEXT: }
// CHECK-NEXT: Symbol {
// CHECK-NEXT: Name: external_aliased_to_local
// CHECK-NEXT: Value: 0
// CHECK-NEXT: Section: .text (1)
// CHECK-NEXT: BaseType: Null (0x0)
// CHECK-NEXT: ComplexType: Null (0x0)
// CHECK-NEXT: StorageClass: Static (0x3)
// CHECK-NEXT: AuxSymbolCount: 0
// CHECK-NEXT: }
// CHECK-NEXT: Symbol {
// CHECK-NEXT: Name: global_aliased_to_external
// CHECK-NEXT: Value: 0
// CHECK-NEXT: Section: (0)
@ -98,7 +89,7 @@ weak_aliased_to_external = external2
// CHECK-NEXT: StorageClass: WeakExternal (0x69)
// CHECK-NEXT: AuxSymbolCount: 1
// CHECK-NEXT: AuxWeakExternal {
// CHECK-NEXT: Linked: external2 (10)
// CHECK-NEXT: Linked: external2 (9)
// CHECK-NEXT: Search: Library (0x2)
// CHECK-NEXT: Unused: (00 00 00 00 00 00 00 00 00 00)
// CHECK-NEXT: }

1
test/MC/COFF/feat00.s
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@ -1,6 +1,7 @@
// RUN: llvm-mc -filetype=obj -triple i686-pc-win32 %s -o - | llvm-readobj -t | FileCheck %s
"@feat.00" = 123
.globl @feat.00
// CHECK: Symbol {
// CHECK: Name: @feat.00

12
test/MC/COFF/lset0.s Executable file
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@ -0,0 +1,12 @@
// RUN: llvm-mc -filetype=obj -triple i686-pc-win32 %s -o - | llvm-nm | FileCheck %s
not_global = 123
global = 456
.globl global
.Llocal = 789
// CHECK-NOT: not_global
// CHECK-NOT: Llocal
// CHECK: global
// CHECK-NOT: not_global
// CHECK-NOT: Llocal