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use 'continue' to make the function linker simpler. When linking a strong

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function into a weak function, zap the weak function body so that the
strong one overrides it.  This fixes PR2410


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52135 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-06-09 07:47:34 +00:00
parent 8246849829
commit 822143e6f7
1 changed files with 37 additions and 21 deletions
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58
lib/Linker/LinkModules.cpp
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@ -916,20 +916,26 @@ static bool LinkFunctionProtos(Module *Dest, const Module *Src,
// the declarations, we aren't adding anything.
if (SF->hasDLLImportLinkage()) {
if (DF->isDeclaration()) {
ValueMap.insert(std::make_pair(SF, DF));
ValueMap[SF] = DF;
DF->setLinkage(SF->getLinkage());
}
}
} else {
ValueMap[SF] = DF;
}
} else if (DF->isDeclaration() && !DF->hasDLLImportLinkage()) {
// If DF is external but SF is not...
// Link the external functions, update linkage qualifiers
}
continue;
}
// If DF is external but SF is not, link the external functions, update
// linkage qualifiers.
if (DF->isDeclaration() && !DF->hasDLLImportLinkage()) {
ValueMap.insert(std::make_pair(SF, DF));
DF->setLinkage(SF->getLinkage());
} else if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage() ||
SF->hasCommonLinkage()) {
// At this point we know that DF has LinkOnce, Weak, or External* linkage.
continue;
}
// At this point we know that DF has LinkOnce, Weak, or External* linkage.
if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage() ||
SF->hasCommonLinkage()) {
ValueMap[SF] = DF;
// Linkonce+Weak = Weak
@ -938,24 +944,34 @@ static bool LinkFunctionProtos(Module *Dest, const Module *Src,
(SF->hasWeakLinkage() || SF->hasCommonLinkage())) ||
DF->hasExternalWeakLinkage())
DF->setLinkage(SF->getLinkage());
} else if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage() ||
DF->hasCommonLinkage()) {
continue;
}
if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage() ||
DF->hasCommonLinkage()) {
// At this point we know that SF has LinkOnce or External* linkage.
ValueMap[SF] = DF;
if (!SF->hasLinkOnceLinkage() && !SF->hasExternalWeakLinkage())
// Don't inherit linkonce & external weak linkage
// If the source function has stronger linkage than the destination,
// its body and linkage should override ours.
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!");
} else if (SF->hasExternalLinkage()) {
// The function is defined identically in both modules!!
DF->deleteBody();
}
continue;
}
if (SF->getLinkage() != DF->getLinkage())
return Error(Err, "Functions named '" + SF->getName() +
"' have different linkage specifiers!");
// The function is defined identically in both modules!
if (SF->hasExternalLinkage())
return Error(Err, "Function '" +
ToStr(SF->getFunctionType(), Src) + "':\"" +
SF->getName() + "\" - Function is already defined!");
} else {
assert(0 && "Unknown linkage configuration found!");
}
assert(0 && "Unknown linkage configuration found!");
}
return false;
}