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Internalize common symbols when we can.

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This fixes pr20974.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217981 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-09-17 20:41:13 +00:00
parent 580875d39d
commit 2bfef929c0
2 changed files with 21 additions and 1 deletions
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18
test/tools/gold/common.ll
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@ -8,4 +8,22 @@
@a = common global i8 0, align 8 @a = common global i8 0, align 8
; Shared library case, we merge @a as common and keep it for the symbol table.
; CHECK: @a = common global i16 0, align 8 ; CHECK: @a = common global i16 0, align 8
; RUN: ld -plugin %llvmshlibdir/LLVMgold.so \
; RUN: --plugin-opt=emit-llvm \
; RUN: %t1.o %t2.o -o %t3.o
; RUN: llvm-dis %t3.o -o - | FileCheck --check-prefix=EXEC %s
; All IR case, we internalize a after merging.
; EXEC: @a = internal global i16 0, align 8
; RUN: llc %p/Inputs/common.ll -o %t2.o -filetype=obj
; RUN: ld -plugin %llvmshlibdir/LLVMgold.so \
; RUN: --plugin-opt=emit-llvm \
; RUN: %t1.o %t2.o -o %t3.o
; RUN: llvm-dis %t3.o -o - | FileCheck --check-prefix=MIXED %s
; Mixed ELF and IR. We keep ours as common so the linker will finish the merge.
; MIXED: @a = common global i8 0, align 8

4
tools/gold/gold-plugin.cpp
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@ -578,10 +578,12 @@ getModuleForFile(LLVMContext &Context, claimed_file &F, raw_fd_ostream *ApiFile,
if (!GV) if (!GV)
continue; // Asm symbol. continue; // Asm symbol.
if (GV->hasCommonLinkage()) { if (Resolution != LDPR_PREVAILING_DEF_IRONLY && GV->hasCommonLinkage()) {
// Common linkage is special. There is no single symbol that wins the // Common linkage is special. There is no single symbol that wins the
// resolution. Instead we have to collect the maximum alignment and size. // resolution. Instead we have to collect the maximum alignment and size.
// The IR linker does that for us if we just pass it every common GV. // The IR linker does that for us if we just pass it every common GV.
// We still have to keep track of LDPR_PREVAILING_DEF_IRONLY so we
// internalize once the IR linker has done its job.
continue; continue;
} }