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Adding dllimport, dllexport and external weak linkage types.

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DLL* linkages got full (I hope) codegeneration support in C & both x86
assembler backends.
External weak linkage added for future use, we don't provide any
codegeneration, etc. support for it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30374 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2006-09-14 18:23:27 +00:00
parent a17cf0a7e2
commit b74ed07bfd
30 changed files with 477 additions and 103 deletions
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42
lib/Linker/LinkModules.cpp
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@ -359,9 +359,16 @@ static bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src,
} else if (Src->isExternal()) {
// If Src is external or if both Src & Drc are external.. Just link the
// external globals, we aren't adding anything.
LinkFromSrc = false;
LT = Dest->getLinkage();
} else if (Dest->isExternal()) {
if (Src->hasDLLImportLinkage()) {
if (Dest->isExternal()) {
LinkFromSrc = true;
LT = Src->getLinkage();
}
} else {
LinkFromSrc = false;
LT = Dest->getLinkage();
}
} else if (Dest->isExternal() && !Dest->hasDLLImportLinkage()) {
// If Dest is external but Src is not:
LinkFromSrc = true;
LT = Src->getLinkage();
@ -372,7 +379,7 @@ 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 or Weak linkage.
// At this point we know that Dest has LinkOnce, External, Weak, DLL* linkage.
if (Dest->hasLinkOnceLinkage() && Src->hasWeakLinkage()) {
LinkFromSrc = true;
LT = Src->getLinkage();
@ -381,11 +388,16 @@ 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 linkage.
// At this point we know that Src has External or DLL* linkage.
LinkFromSrc = true;
LT = GlobalValue::ExternalLinkage;
} else {
assert(Dest->hasExternalLinkage() && Src->hasExternalLinkage() &&
assert((Dest->hasExternalLinkage() ||
Dest->hasDLLImportLinkage() ||
Dest->hasDLLExportLinkage()) &&
(Src->hasExternalLinkage() ||
Src->hasDLLImportLinkage() ||
Src->hasDLLExportLinkage()) &&
"Unexpected linkage type!");
return Error(Err, "Linking globals named '" + Src->getName() +
"': symbol multiply defined!");
@ -425,7 +437,8 @@ static bool LinkGlobals(Module *Dest, Module *Src,
if (DGV && DGV->hasInternalLinkage())
DGV = 0;
assert(SGV->hasInitializer() || SGV->hasExternalLinkage() &&
assert(SGV->hasInitializer() ||
SGV->hasExternalLinkage() || SGV->hasDLLImportLinkage() &&
"Global must either be external or have an initializer!");
GlobalValue::LinkageTypes NewLinkage;
@ -565,7 +578,7 @@ static bool LinkGlobalInits(Module *Dest, const Module *Src,
//
static bool LinkFunctionProtos(Module *Dest, const Module *Src,
std::map<const Value*, Value*> &ValueMap,
std::map<std::string, GlobalValue*> &GlobalsByName,
std::map<std::string, GlobalValue*> &GlobalsByName,
std::string *Err) {
SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable();
@ -604,12 +617,19 @@ static bool LinkFunctionProtos(Module *Dest, const Module *Src,
} else if (SF->isExternal()) {
// If SF is external or if both SF & DF are external.. Just link the
// external functions, we aren't adding anything.
ValueMap.insert(std::make_pair(SF, DF));
} else if (DF->isExternal()) { // If DF is external but SF is not...
if (SF->hasDLLImportLinkage()) {
if (DF->isExternal()) {
ValueMap.insert(std::make_pair(SF, DF));
DF->setLinkage(SF->getLinkage());
}
} else {
ValueMap.insert(std::make_pair(SF, DF));
}
} else if (DF->isExternal() && !DF->hasDLLImportLinkage()) {
// If DF is external but SF is not...
// Link the external functions, update linkage qualifiers
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.
ValueMap.insert(std::make_pair(SF, DF));