[llvm] r331397 - [llvm-objcopy] Add --weaken option
Paul Semel via llvm-commits
llvm-commits at lists.llvm.org
Wed May 2 13:14:49 PDT 2018
Author: paulsemel
Date: Wed May 2 13:14:49 2018
New Revision: 331397
URL: http://llvm.org/viewvc/llvm-project?rev=331397&view=rev
Log:
[llvm-objcopy] Add --weaken option
Added:
llvm/trunk/test/tools/llvm-objcopy/weaken-all.test
Modified:
llvm/trunk/tools/llvm-objcopy/Opts.td
llvm/trunk/tools/llvm-objcopy/llvm-objcopy.cpp
Added: llvm/trunk/test/tools/llvm-objcopy/weaken-all.test
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/llvm-objcopy/weaken-all.test?rev=331397&view=auto
==============================================================================
--- llvm/trunk/test/tools/llvm-objcopy/weaken-all.test (added)
+++ llvm/trunk/test/tools/llvm-objcopy/weaken-all.test Wed May 2 13:14:49 2018
@@ -0,0 +1,94 @@
+# RUN: yaml2obj %s > %t
+# RUN: llvm-objcopy --weaken %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
+ - Name: .rel.text
+ Type: SHT_REL
+ Info: .text
+ Relocations:
+ - Offset: 0x1000
+ Symbol: undefGlobal
+ Type: R_X86_64_PC32
+Symbols:
+ Local:
+ - Name: Local
+ Type: STT_FUNC
+ Section: .text
+ Value: 0x1008
+ Size: 8
+ Weak:
+ - Name: Weak
+ Type: STT_FUNC
+ Size: 8
+ Section: .text
+ Value: 0x1010
+ Global:
+ - Name: Global
+ Type: STT_FUNC
+ Size: 8
+ Section: .text
+ Value: 0x1018
+ - Name: undefGlobal
+ Type: STT_FUNC
+ Size: 8
+
+#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: 0x1008
+#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: 0x1018
+#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: undefGlobal
+#CHECK-NEXT: Value: 0x0
+#CHECK-NEXT: Size: 8
+#CHECK-NEXT: Binding: Global
+#CHECK-NEXT: Type: Function
+#CHECK-NEXT: Other: 0
+#CHECK-NEXT: Section:
+#CHECK-NEXT: }
+#CHECK-NEXT: Symbol {
+#CHECK-NEXT: Name: Weak
+#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:]
Modified: llvm/trunk/tools/llvm-objcopy/Opts.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/llvm-objcopy/Opts.td?rev=331397&r1=331396&r2=331397&view=diff
==============================================================================
--- llvm/trunk/tools/llvm-objcopy/Opts.td (original)
+++ llvm/trunk/tools/llvm-objcopy/Opts.td Wed May 2 13:14:49 2018
@@ -72,3 +72,5 @@ defm weaken_symbol : Eq<"weaken-symbol">
HelpText<"Mark <symbol> as weak">;
def W : JoinedOrSeparate<["-"], "W">,
Alias<weaken_symbol>;
+def weaken : Flag<["-", "--"], "weaken">,
+ HelpText<"Mark all global symbols as weak">;
Modified: llvm/trunk/tools/llvm-objcopy/llvm-objcopy.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/llvm-objcopy/llvm-objcopy.cpp?rev=331397&r1=331396&r2=331397&view=diff
==============================================================================
--- llvm/trunk/tools/llvm-objcopy/llvm-objcopy.cpp (original)
+++ llvm/trunk/tools/llvm-objcopy/llvm-objcopy.cpp Wed May 2 13:14:49 2018
@@ -130,6 +130,7 @@ struct CopyConfig {
bool StripDWO;
bool ExtractDWO;
bool LocalizeHidden;
+ bool Weaken;
};
using SectionPred = std::function<bool(const SectionBase &Sec)>;
@@ -334,6 +335,10 @@ void HandleArgs(const CopyConfig &Config
Sym.Binding == STB_GLOBAL)
Sym.Binding = STB_WEAK;
+ if (Config.Weaken && Sym.Binding == STB_GLOBAL &&
+ Sym.getShndx() != SHN_UNDEF)
+ Sym.Binding = STB_WEAK;
+
const auto I = Config.SymbolsToRename.find(Sym.Name);
if (I != Config.SymbolsToRename.end())
Sym.Name = I->getValue();
@@ -423,6 +428,7 @@ CopyConfig ParseObjcopyOptions(ArrayRef<
Config.StripNonAlloc = InputArgs.hasArg(OBJCOPY_strip_non_alloc);
Config.ExtractDWO = InputArgs.hasArg(OBJCOPY_extract_dwo);
Config.LocalizeHidden = InputArgs.hasArg(OBJCOPY_localize_hidden);
+ Config.Weaken = InputArgs.hasArg(OBJCOPY_weaken);
for (auto Arg : InputArgs.filtered(OBJCOPY_localize_symbol))
Config.SymbolsToLocalize.push_back(Arg->getValue());
for (auto Arg : InputArgs.filtered(OBJCOPY_globalize_symbol))
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