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Fix linking of unnamed_addr. 

This was regression from r134829. When linking we have to be conservative. If
one of the symbols has a significant address, then the result should have it
too.

llvm-svn: 189935
This commit is contained in:
Rafael Espindola 2013-09-04 14:05:09 +00:00
parent 0a3b151fdf
commit d4885daefa
2 changed files with 9 additions and 5 deletions
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6
llvm/lib/Linker/LinkModules.cpp
View File

@ -746,6 +746,7 @@ bool ModuleLinker::linkAppendingVarProto(GlobalVariable *DstGV,
bool ModuleLinker::linkGlobalProto(GlobalVariable *SGV) {
GlobalValue *DGV = getLinkedToGlobal(SGV);
llvm::Optional<GlobalValue::VisibilityTypes> NewVisibility;
bool HasUnnamedAddr = SGV->hasUnnamedAddr();
if (DGV) {
// Concatenation of appending linkage variables is magic and handled later.
@ -755,6 +756,7 @@ bool ModuleLinker::linkGlobalProto(GlobalVariable *SGV) {
// Determine whether linkage of these two globals follows the source
// module's definition or the destination module's definition.
GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage;
HasUnnamedAddr = HasUnnamedAddr && DGV->hasUnnamedAddr();
GlobalValue::VisibilityTypes NV;
bool LinkFromSrc = false;
if (getLinkageResult(DGV, SGV, NewLinkage, NV, LinkFromSrc))
@ -769,9 +771,10 @@ bool ModuleLinker::linkGlobalProto(GlobalVariable *SGV) {
if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant())
DGVar->setConstant(true);
// Set calculated linkage and visibility.
// Set calculated linkage, visibility and unnamed_addr.
DGV->setLinkage(NewLinkage);
DGV->setVisibility(*NewVisibility);
DGV->setUnnamedAddr(HasUnnamedAddr);
// Make sure to remember this mapping.
ValueMap[SGV] = ConstantExpr::getBitCast(DGV,TypeMap.get(SGV->getType()));
@ -797,6 +800,7 @@ bool ModuleLinker::linkGlobalProto(GlobalVariable *SGV) {
copyGVAttributes(NewDGV, SGV);
if (NewVisibility)
NewDGV->setVisibility(*NewVisibility);
NewDGV->setUnnamedAddr(HasUnnamedAddr);
if (DGV) {
DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV, DGV->getType()));

6
llvm/test/Linker/unnamed-addr1-a.ll
View File

@ -10,15 +10,15 @@
@c = common unnamed_addr global i32 0
; CHECK: @c = common unnamed_addr global i32 0
@d = external global i32
; CHECK: @d = unnamed_addr global i32 42
; CHECK: @d = global i32 42
@e = external unnamed_addr global i32
; CHECK: @e = unnamed_addr global i32 42
@f = weak global i32 42
; CHECK: @f = unnamed_addr global i32 42
; CHECK: @f = global i32 42
; Other file has non-unnamed_addr definition
@g = common unnamed_addr global i32 0
; CHECK: @g = common unnamed_addr global i32 0
; CHECK: @g = common global i32 0
@h = external global i32
; CHECK: @h = global i32 42
@i = external unnamed_addr global i32