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* Fairly substantial change. Instead of creating new globalvariables, then

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replaceAllUsesWith'ing any forward references, just use the forward
  reference if it exists.

This introduces GetForwardRefForGlobal, which will eventually completely
replace the horrible DeclareNewGlobalValue function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14828 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-07-14 21:44:00 +00:00
parent cb9d6a8f73
commit 8a32784ad4
1 changed files with 49 additions and 14 deletions
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63
lib/AsmParser/llvmAsmParser.y
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@ -112,6 +112,21 @@ static struct PerModuleInfo {
}
// GetForwardRefForGlobal - Check to see if there is a forward reference
// for this global. If so, remove it from the GlobalRefs map and return it.
// If not, just return null.
GlobalValue *GetForwardRefForGlobal(const PointerType *PTy, ValID ID) {
// Check to see if there is a forward reference to this global variable...
// if there is, eliminate it and patch the reference to use the new def'n.
GlobalRefsType::iterator I = GlobalRefs.find(std::make_pair(PTy, ID));
GlobalValue *Ret = 0;
if (I != GlobalRefs.end()) {
Ret = I->second;
GlobalRefs.erase(I);
}
return Ret;
}
// DeclareNewGlobalValue - Called every time a new GV has been defined. This
// is used to remove things from the forward declaration map, resolving them
// to the correct thing as needed.
@ -626,15 +641,30 @@ static void ParseGlobalVariable(char *NameStr,GlobalValue::LinkageTypes Linkage,
}
}
GlobalVariable *GV = new GlobalVariable(Ty, isConstantGlobal, Linkage,
Initializer, Name,
CurModule.CurrentModule);
int Slot = InsertValue(GV, CurModule.Values);
if (Slot != -1) {
CurModule.DeclareNewGlobalValue(GV, ValID::create(Slot));
const PointerType *PTy = PointerType::get(Ty);
// See if this global value was forward referenced. If so, recycle the
// object.
ValID ID;
if (!Name.empty()) {
ID = ValID::create((char*)Name.c_str());
} else {
CurModule.DeclareNewGlobalValue(GV, ValID::create((char*)Name.c_str()));
ID = ValID::create((int)CurModule.Values[PTy].size());
}
if (GlobalValue *FWGV = CurModule.GetForwardRefForGlobal(PTy, ID)) {
// Move the global to the end of the list, from whereever it was
// previously inserted.
GlobalVariable *GV = cast<GlobalVariable>(FWGV);
CurModule.CurrentModule->getGlobalList().remove(GV);
CurModule.CurrentModule->getGlobalList().push_back(GV);
GV->setInitializer(Initializer);
GV->setLinkage(Linkage);
GV->setConstant(isConstantGlobal);
} else {
// Otherwise there is no existing GV to use, create one now.
new GlobalVariable(Ty, isConstantGlobal, Linkage, Initializer, Name,
CurModule.CurrentModule);
}
}
@ -1261,15 +1291,20 @@ ConstVal: Types '[' ConstVector ']' { // Nonempty unsized arr
V = I->second; // Placeholder already exists, use it...
$2.destroy();
} else {
std::string Name;
/// FIXME: We shouldn't be creating global vars as forward refs for
/// functions at all here!
if (!isa<FunctionType>(PT->getElementType()))
if ($2.Type == ValID::NameVal) Name = $2.Name;
// Create a placeholder for the global variable reference...
GlobalVariable *GV = new GlobalVariable(PT->getElementType(),
false,
GlobalValue::ExternalLinkage);
GlobalVariable *GV = new GlobalVariable(PT->getElementType(), false,
GlobalValue::ExternalLinkage,0,
Name, CurModule.CurrentModule);
// Keep track of the fact that we have a forward ref to recycle it
CurModule.GlobalRefs.insert(std::make_pair(std::make_pair(PT, $2), GV));
// Must temporarily push this value into the module table...
CurModule.CurrentModule->getGlobalList().push_back(GV);
V = GV;
}
}