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Add support for weak symbols in LTO. 

llvm-svn: 261881
This commit is contained in:
Rafael Espindola 2016-02-25 16:25:41 +00:00
parent f1ce4cf1f1
commit 148445ef98
4 changed files with 23 additions and 5 deletions
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6
lld/ELF/InputFiles.cpp
View File

@ -450,10 +450,12 @@ void BitcodeFile::parse() {
Sym.printName(OS);
StringRef NameRef = Saver.save(StringRef(Name));
SymbolBody *Body;
if (Sym.getFlags() & BasicSymbolRef::SF_Undefined)
uint32_t Flags = Sym.getFlags();
if (Flags & BasicSymbolRef::SF_Undefined)
Body = new (Alloc) Undefined(NameRef, false, STV_DEFAULT, false);
else
Body = new (Alloc) DefinedBitcode(NameRef);
Body =
new (Alloc) DefinedBitcode(NameRef, Flags & BasicSymbolRef::SF_Weak);
SymbolBodies.push_back(Body);
}
}

4
lld/ELF/Symbols.cpp
View File

@ -161,8 +161,8 @@ Defined::Defined(Kind K, StringRef Name, bool IsWeak, uint8_t Visibility,
bool IsTls, bool IsFunction)
: SymbolBody(K, Name, IsWeak, Visibility, IsTls, IsFunction) {}
DefinedBitcode::DefinedBitcode(StringRef Name)
: Defined(DefinedBitcodeKind, Name, false, STV_DEFAULT, false, false) {}
DefinedBitcode::DefinedBitcode(StringRef Name, bool IsWeak)
: Defined(DefinedBitcodeKind, Name, IsWeak, STV_DEFAULT, false, false) {}
bool DefinedBitcode::classof(const SymbolBody *S) {
return S->kind() == DefinedBitcodeKind;

2
lld/ELF/Symbols.h
View File

@ -190,7 +190,7 @@ public:
class DefinedBitcode : public Defined {
public:
DefinedBitcode(StringRef Name);
DefinedBitcode(StringRef Name, bool IsWeak);
static bool classof(const SymbolBody *S);
};

16
lld/test/ELF/lto/weak.ll Normal file
View File

@ -0,0 +1,16 @@
; REQUIRES: x86
; RUN: llvm-as %s -o %t.o
; RUN: ld.lld -m elf_x86_64 %t.o %t.o -o %t.so -shared
; RUN: llvm-readobj -t %t.so | FileCheck %s
target triple = "x86_64-unknown-linux-gnu"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define weak void @f() {
ret void
}
; CHECK: Name: f
; CHECK-NEXT: Value: 0x1000
; CHECK-NEXT: Size: 1
; CHECK-NEXT: Binding: Weak