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[llvm-objcopy] Add --weaken-symbol (-W) option

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llvm-svn: 331070
This commit is contained in:
Paul Semel 2018-04-27 19:16:27 +00:00
parent 4f7c52eb8c
commit 9f7c96bb7c
3 changed files with 88 additions and 0 deletions
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75
test/tools/llvm-objcopy/weaken.test Normal file
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@ -0,0 +1,75 @@
# RUN: yaml2obj %s > %t
# RUN: llvm-objcopy --weaken-symbol Global -W Local -W Weak %t %t2
# RUN: llvm-readobj -symbols %t2 | FileCheck %s
!ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
Address: 0x1000
AddressAlign: 0x0000000000000010
Size: 64
Symbols:
Local:
- Name: Local
Type: STT_FUNC
Section: .text
Value: 0x1000
Size: 8
Weak:
- Name: Weak
Type: STT_FUNC
Size: 8
Section: .text
Value: 0x1008
Global:
- Name: Global
Type: STT_FUNC
Size: 8
Section: .text
Value: 0x1010
#CHECK: Symbols [
#CHECK-NEXT: Symbol {
#CHECK-NEXT: Name:
#CHECK-NEXT: Value: 0x0
#CHECK-NEXT: Size: 0
#CHECK-NEXT: Binding: Local
#CHECK-NEXT: Type: None
#CHECK-NEXT: Other: 0
#CHECK-NEXT: Section: Undefined
#CHECK-NEXT: }
#CHECK-NEXT: Symbol {
#CHECK-NEXT: Name: Local
#CHECK-NEXT: Value: 0x1000
#CHECK-NEXT: Size: 8
#CHECK-NEXT: Binding: Local
#CHECK-NEXT: Type: Function
#CHECK-NEXT: Other: 0
#CHECK-NEXT: Section: .text
#CHECK-NEXT: }
#CHECK-NEXT: Symbol {
#CHECK-NEXT: Name: Global
#CHECK-NEXT: Value: 0x1010
#CHECK-NEXT: Size: 8
#CHECK-NEXT: Binding: Weak
#CHECK-NEXT: Type: Function
#CHECK-NEXT: Other: 0
#CHECK-NEXT: Section: .text
#CHECK-NEXT: }
#CHECK-NEXT: Symbol {
#CHECK-NEXT: Name: Weak
#CHECK-NEXT: Value: 0x1008
#CHECK-NEXT: Size: 8
#CHECK-NEXT: Binding: Weak
#CHECK-NEXT: Type: Function
#CHECK-NEXT: Other: 0
#CHECK-NEXT: Section: .text
#CHECK-NEXT: }
#CHECK-NEXT:]

5
tools/llvm-objcopy/Opts.td
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@ -67,3 +67,8 @@ def L : JoinedOrSeparate<["-"], "L">,
defm globalize_symbol : Eq<"globalize-symbol">,
MetaVarName<"symbol">,
HelpText<"Mark <symbol> as global">;
defm weaken_symbol : Eq<"weaken-symbol">,
MetaVarName<"symbol">,
HelpText<"Mark <symbol> as weak">;
def W : JoinedOrSeparate<["-"], "W">,
Alias<weaken_symbol>;

8
tools/llvm-objcopy/llvm-objcopy.cpp
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@ -120,6 +120,7 @@ struct CopyConfig {
std::vector<StringRef> AddSection;
std::vector<StringRef> SymbolsToLocalize;
std::vector<StringRef> SymbolsToGlobalize;
std::vector<StringRef> SymbolsToWeaken;
StringMap<StringRef> SymbolsToRename;
bool StripAll;
bool StripAllGNU;
@ -328,6 +329,11 @@ void HandleArgs(const CopyConfig &Config, Object &Obj, const Reader &Reader,
is_contained(Config.SymbolsToGlobalize, Sym.Name))
Sym.Binding = STB_GLOBAL;
if (!Config.SymbolsToWeaken.empty() &&
is_contained(Config.SymbolsToWeaken, Sym.Name) &&
Sym.Binding == STB_GLOBAL)
Sym.Binding = STB_WEAK;
const auto I = Config.SymbolsToRename.find(Sym.Name);
if (I != Config.SymbolsToRename.end())
Sym.Name = I->getValue();
@ -421,6 +427,8 @@ CopyConfig ParseObjcopyOptions(ArrayRef<const char *> ArgsArr) {
Config.SymbolsToLocalize.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_globalize_symbol))
Config.SymbolsToGlobalize.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_weaken_symbol))
Config.SymbolsToWeaken.push_back(Arg->getValue());
return Config;
}