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Remove a bunch of complicated code. The functionality is implemented in instcombine instead

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llvm-svn: 6782
This commit is contained in:
Chris Lattner 2003-06-19 16:59:19 +00:00
parent 19eecb51db
commit cee19b1ace
1 changed files with 6 additions and 118 deletions
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124
lib/Transforms/IPO/FunctionResolution.cpp
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@ -36,94 +36,6 @@ Pass *createFunctionResolvingPass() {
return new FunctionResolvingPass();
}
// ConvertCallTo - Convert a call to a varargs function with no arg types
// specified to a concrete nonvarargs function.
//
static void ConvertCallTo(CallInst *CI, Function *Dest) {
const FunctionType::ParamTypes &ParamTys =
Dest->getFunctionType()->getParamTypes();
BasicBlock *BB = CI->getParent();
// Keep an iterator to where we want to insert cast instructions if the
// argument types don't agree.
//
unsigned NumArgsToCopy = CI->getNumOperands()-1;
if (NumArgsToCopy != ParamTys.size() &&
!(NumArgsToCopy > ParamTys.size() &&
Dest->getFunctionType()->isVarArg())) {
std::cerr << "WARNING: Call arguments do not match expected number of"
<< " parameters.\n";
std::cerr << "WARNING: In function '"
<< CI->getParent()->getParent()->getName() << "': call: " << *CI;
std::cerr << "Function resolved to: ";
WriteAsOperand(std::cerr, Dest);
std::cerr << "\n";
if (NumArgsToCopy > ParamTys.size())
NumArgsToCopy = ParamTys.size();
}
std::vector<Value*> Params;
// Convert all of the call arguments over... inserting cast instructions if
// the types are not compatible.
for (unsigned i = 1; i <= NumArgsToCopy; ++i) {
Value *V = CI->getOperand(i);
if (i-1 < ParamTys.size() && V->getType() != ParamTys[i-1]) {
// Must insert a cast...
V = new CastInst(V, ParamTys[i-1], "argcast", CI);
}
Params.push_back(V);
}
// If the function takes extra parameters that are not being passed in, pass
// null values in now...
for (unsigned i = NumArgsToCopy; i < ParamTys.size(); ++i)
Params.push_back(Constant::getNullValue(ParamTys[i]));
// Replace the old call instruction with a new call instruction that calls
// the real function.
//
Instruction *NewCall = new CallInst(Dest, Params, "", CI);
std::string Name = CI->getName(); CI->setName("");
// Transfer the name over...
if (NewCall->getType() != Type::VoidTy)
NewCall->setName(Name);
// Replace uses of the old instruction with the appropriate values...
//
if (NewCall->getType() == CI->getType()) {
CI->replaceAllUsesWith(NewCall);
NewCall->setName(Name);
} else if (NewCall->getType() == Type::VoidTy) {
// Resolved function does not return a value but the prototype does. This
// often occurs because undefined functions default to returning integers.
// Just replace uses of the call (which are broken anyway) with dummy
// values.
CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
} else if (CI->getType() == Type::VoidTy) {
// If we are gaining a new return value, we don't have to do anything
// special here, because it will automatically be ignored.
} else {
// Insert a cast instruction to convert the return value of the function
// into it's new type. Of course we only need to do this if the return
// value of the function is actually USED.
//
if (!CI->use_empty()) {
// Insert the new cast instruction...
CastInst *NewCast = new CastInst(NewCall, CI->getType(), Name, CI);
CI->replaceAllUsesWith(NewCast);
}
}
// The old instruction is no longer needed, destroy it!
BB->getInstList().erase(CI);
}
static bool ResolveFunctions(Module &M, std::vector<GlobalValue*> &Globals,
Function *Concrete) {
bool Changed = false;
@ -168,36 +80,12 @@ static bool ResolveFunctions(Module &M, std::vector<GlobalValue*> &Globals,
// functions and that the Old function has no varargs fns specified. In
// otherwords it's just <retty> (...)
//
for (unsigned i = 0; i < Old->use_size(); ) {
User *U = *(Old->use_begin()+i);
if (CastInst *CI = dyn_cast<CastInst>(U)) {
// Convert casts directly
assert(CI->getOperand(0) == Old);
CI->setOperand(0, Concrete);
Changed = true;
++NumResolved;
} else if (CallInst *CI = dyn_cast<CallInst>(U)) {
// Can only fix up calls TO the argument, not args passed in.
if (CI->getCalledValue() == Old) {
ConvertCallTo(CI, Concrete);
Changed = true;
++NumResolved;
} else {
++i;
}
} else {
++i;
}
}
// If there are any more uses that we could not resolve, force them to use
// a casted pointer now.
if (!Old->use_empty()) {
NumResolved += Old->use_size();
Constant *NewCPR = ConstantPointerRef::get(Concrete);
Old->replaceAllUsesWith(ConstantExpr::getCast(NewCPR, Old->getType()));
Changed = true;
}
Value *Replacement = Concrete;
if (Concrete->getType() != Old->getType())
Replacement = ConstantExpr::getCast(ConstantPointerRef::get(Concrete),
Old->getType());
NumResolved += Old->use_size();
Old->replaceAllUsesWith(Replacement);
// Since there are no uses of Old anymore, remove it from the module.
M.getFunctionList().erase(Old);