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Add support for 'weak' linkage.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9171 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-10-16 18:29:00 +00:00
parent 6b25242a4b
commit 72ac148d49
9 changed files with 117 additions and 22 deletions
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37
lib/Transforms/Utils/Linker.cpp
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@ -433,6 +433,24 @@ static bool LinkGlobals(Module *Dest, const Module *Src,
} else if (DGV->isExternal()) { // If DGV is external but SGV is not...
ValueMap.insert(std::make_pair(SGV, DGV));
DGV->setLinkage(SGV->getLinkage()); // Inherit linkage!
} else if (SGV->hasWeakLinkage()) {
// At this point we know that DGV has LinkOnce, Appending, Weak, or
// External linkage. If DGV is Appending, this is an error.
if (DGV->hasAppendingLinkage())
return Error(Err, "Linking globals named '" + SGV->getName() +
" ' with 'weak' and 'appending' linkage is not allowed!");
// Otherwise, just perform the link.
ValueMap.insert(std::make_pair(SGV, DGV));
} else if (DGV->hasWeakLinkage()) {
// At this point we know that SGV has LinkOnce, Appending, or External
// linkage. If SGV is Appending, this is an error.
if (SGV->hasAppendingLinkage())
return Error(Err, "Linking globals named '" + SGV->getName() +
" ' with 'weak' and 'appending' linkage is not allowed!");
if (!SGV->hasLinkOnceLinkage())
DGV->setLinkage(SGV->getLinkage()); // Inherit linkage!
ValueMap.insert(std::make_pair(SGV, DGV));
} else if (SGV->getLinkage() != DGV->getLinkage()) {
return Error(Err, "Global variables named '" + SGV->getName() +
"' have different linkage specifiers!");
@ -505,7 +523,7 @@ static bool LinkGlobalInits(Module *Dest, const Module *Src,
return Error(Err, "Global Variable Collision on '" +
SGV->getType()->getDescription() +"':%"+SGV->getName()+
" - Global variables have different initializers");
} else if (DGV->hasLinkOnceLinkage()) {
} else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage()) {
// Nothing is required, mapped values will take the new global
// automatically.
} else if (DGV->hasAppendingLinkage()) {
@ -574,6 +592,16 @@ static bool LinkFunctionProtos(Module *Dest, const Module *Src,
ValueMap.insert(std::make_pair(SF, DF));
DF->setLinkage(SF->getLinkage());
} else if (SF->hasWeakLinkage()) {
// At this point we know that DF has LinkOnce, Weak, or External linkage.
ValueMap.insert(std::make_pair(SF, DF));
} else if (DF->hasWeakLinkage()) {
// 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
DF->setLinkage(SF->getLinkage());
} else if (SF->getLinkage() != DF->getLinkage()) {
return Error(Err, "Functions named '" + SF->getName() +
"' have different linkage specifiers!");
@ -667,10 +695,9 @@ static bool LinkFunctionBodies(Module *Dest, const Module *Src,
// DF not external SF external?
if (!DF->isExternal()) {
if (DF->hasLinkOnceLinkage()) continue; // No relinkage for link-once!
if (Err)
*Err = "Function '" + (SF->hasName() ? SF->getName() :std::string(""))
+ "' body multiply defined!";
return true;
if (SF->hasWeakLinkage()) continue;
return Error(Err, "Function '" + SF->getName() +
"' body multiply defined!");
}
if (LinkFunctionBody(DF, SF, ValueMap, Err)) return true;