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Introducing external weak linkage. Darwin codegen should be added later.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32052 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2006-12-01 00:25:12 +00:00
parent 44c030a7ee
commit 78ee7b78c3
9 changed files with 89 additions and 30 deletions
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36
lib/Linker/LinkModules.cpp
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@ -360,6 +360,7 @@ static bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src,
// If Src is external or if both Src & Drc are external.. Just link the
// external globals, we aren't adding anything.
if (Src->hasDLLImportLinkage()) {
// If one of GVs has DLLImport linkage, result should be dllimport'ed.
if (Dest->isExternal()) {
LinkFromSrc = true;
LT = Src->getLinkage();
@ -379,8 +380,9 @@ static bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src,
LinkFromSrc = true; // Special cased.
LT = Src->getLinkage();
} else if (Src->hasWeakLinkage() || Src->hasLinkOnceLinkage()) {
// At this point we know that Dest has LinkOnce, External, Weak, DLL* linkage.
if (Dest->hasLinkOnceLinkage() && Src->hasWeakLinkage()) {
// At this point we know that Dest has LinkOnce, External*, Weak, DLL* linkage.
if ((Dest->hasLinkOnceLinkage() && Src->hasWeakLinkage()) ||
Dest->hasExternalWeakLinkage()) {
LinkFromSrc = true;
LT = Src->getLinkage();
} else {
@ -388,16 +390,23 @@ static bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src,
LT = Dest->getLinkage();
}
} else if (Dest->hasWeakLinkage() || Dest->hasLinkOnceLinkage()) {
// At this point we know that Src has External or DLL* linkage.
LinkFromSrc = true;
LT = GlobalValue::ExternalLinkage;
// At this point we know that Src has External* or DLL* linkage.
if (Src->hasExternalWeakLinkage()) {
LinkFromSrc = false;
LT = Dest->getLinkage();
} else {
LinkFromSrc = true;
LT = GlobalValue::ExternalLinkage;
}
} else {
assert((Dest->hasExternalLinkage() ||
Dest->hasDLLImportLinkage() ||
Dest->hasDLLExportLinkage()) &&
Dest->hasDLLExportLinkage() ||
Dest->hasExternalWeakLinkage()) &&
(Src->hasExternalLinkage() ||
Src->hasDLLImportLinkage() ||
Src->hasDLLExportLinkage()) &&
Src->hasDLLExportLinkage() ||
Src->hasExternalWeakLinkage()) &&
"Unexpected linkage type!");
return Error(Err, "Linking globals named '" + Src->getName() +
"': symbol multiply defined!");
@ -631,19 +640,22 @@ static bool LinkFunctionProtos(Module *Dest, const Module *Src,
ValueMap.insert(std::make_pair(SF, DF));
DF->setLinkage(SF->getLinkage());
} else if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage()) {
// At this point we know that DF has LinkOnce, Weak, or External linkage.
// At this point we know that DF has LinkOnce, Weak, or External* linkage.
ValueMap.insert(std::make_pair(SF, DF));
// Linkonce+Weak = Weak
if (DF->hasLinkOnceLinkage() && SF->hasWeakLinkage())
// *+External Weak = *
if ((DF->hasLinkOnceLinkage() && SF->hasWeakLinkage()) ||
DF->hasExternalWeakLinkage())
DF->setLinkage(SF->getLinkage());
} else if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage()) {
// At this point we know that SF has LinkOnce or External linkage.
// At this point we know that SF has LinkOnce or External* linkage.
ValueMap.insert(std::make_pair(SF, DF));
if (!SF->hasLinkOnceLinkage()) // Don't inherit linkonce linkage
if (!SF->hasLinkOnceLinkage() && !SF->hasExternalWeakLinkage())
// Don't inherit linkonce & external weak linkage
DF->setLinkage(SF->getLinkage());
} else if (SF->getLinkage() != DF->getLinkage()) {
return Error(Err, "Functions named '" + SF->getName() +
"' have different linkage specifiers!");