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Non alloca sections should not keep other sections live.

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This matches the gold behaviour and is important to prevent debug info
from effectively disabling gc.

llvm-svn: 282444
This commit is contained in:
Rafael Espindola 2016-09-26 21:34:34 +00:00
parent 3b66056a3f
commit 2b9008e5e5
2 changed files with 33 additions and 1 deletions
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3
lld/ELF/MarkLive.cpp
View File

@ -208,7 +208,8 @@ template <class ELFT> void elf::markLive() {
return; return;
R.Sec->Live = true; R.Sec->Live = true;
if (InputSection<ELFT> *S = dyn_cast<InputSection<ELFT>>(R.Sec)) if (InputSection<ELFT> *S = dyn_cast<InputSection<ELFT>>(R.Sec))
Q.push_back(S); if (S->getSectionHdr()->sh_flags & SHF_ALLOC)
Q.push_back(S);
}; };
auto MarkSymbol = [&](const SymbolBody *Sym) { auto MarkSymbol = [&](const SymbolBody *Sym) {

31
lld/test/ELF/gc-sections-alloc.s Normal file
View File

@ -0,0 +1,31 @@
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
# RUN: ld.lld %t -o %t2 --gc-sections -shared
# RUN: llvm-readobj -sections -section-data %t2 | FileCheck %s
# Non alloca section .bar should not keep section .foo alive.
# CHECK-NOT: Name: .foo
# CHECK: Name: .bar
# CHECK-NEXT: Type: SHT_PROGBITS
# CHECK-NEXT: Flags [
# CHECK-NEXT: ]
# CHECK-NEXT: Address:
# CHECK-NEXT: Offset:
# CHECK-NEXT: Size:
# CHECK-NEXT: Link:
# CHECK-NEXT: Info:
# CHECK-NEXT: AddressAlignment:
# CHECK-NEXT: EntrySize:
# CHECK-NEXT: SectionData (
# CHECK-NEXT: 0000: 00000000 00000000 |
# CHECK-NEXT: )
.section .foo,"a"
.byte 0
.section .bar
.quad .foo