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[Object] Add SF_Exported flag. This flag will be set on all symbols that would

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be exported from a dylib if their containing object file were linked into one.

No test case: No command line tools query this flag, and there are no Object
unit tests.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226217 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2015-01-15 22:33:30 +00:00
parent df1b4f601d
commit 07e3f81e93
3 changed files with 23 additions and 2 deletions
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17
include/llvm/Object/ELFObjectFile.h
View File

@ -177,6 +177,20 @@ protected:
return DRI;
}
bool isExportedToOtherDSO(const Elf_Sym *ESym) const {
unsigned char Binding = ESym->getBinding();
unsigned char Visibility = ESym->getVisibility();
// A symbol is exported if its binding is either GLOBAL or WEAK, and its
// visibility is either DEFAULT or PROTECTED. All other symbols are not
// exported.
if ((Binding == ELF::STB_GLOBAL || Binding == ELF::STB_WEAK) &&
(Visibility == ELF::STV_DEFAULT && Visibility == ELF::STV_PROTECTED))
return true;
return false;
}
// This flag is used for classof, to distinguish ELFObjectFile from
// its subclass. If more subclasses will be created, this flag will
// have to become an enum.
@ -389,6 +403,9 @@ uint32_t ELFObjectFile<ELFT>::getSymbolFlags(DataRefImpl Symb) const {
EF.getSymbolTableIndex(ESym) == ELF::SHN_COMMON)
Result |= SymbolRef::SF_Common;
if (isExportedToOtherDSO(ESym))
Result |= SymbolRef::SF_Exported;
return Result;
}

5
include/llvm/Object/SymbolicFile.h
View File

@ -87,9 +87,10 @@ public:
SF_Absolute = 1U << 3, // Absolute symbol
SF_Common = 1U << 4, // Symbol has common linkage
SF_Indirect = 1U << 5, // Symbol is an alias to another symbol
SF_FormatSpecific = 1U << 6, // Specific to the object file format
SF_Exported = 1U << 6, // Symbol is visible to other DSOs
SF_FormatSpecific = 1U << 7, // Specific to the object file format
// (e.g. section symbols)
SF_Thumb = 1U << 7 // Thumb symbol in a 32-bit ARM binary
SF_Thumb = 1U << 8, // Thumb symbol in a 32-bit ARM binary
};
BasicSymbolRef() : OwningObject(nullptr) { }

3
lib/Object/MachOObjectFile.cpp
View File

@ -478,6 +478,9 @@ uint32_t MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const {
if (Value && Value != UnknownAddressOrSize)
Result |= SymbolRef::SF_Common;
}
if (!(MachOType & MachO::N_PEXT))
Result |= SymbolRef::SF_Exported;
}
if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))