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implement codegen support for the "default argument promotions" (C99 6.5.2.2p6). 

Not having this prevented promoting float arguments to double when passed
into printf, for example.

llvm-svn: 39727
This commit is contained in:
Chris Lattner 2007-07-10 22:18:37 +00:00
parent 11eef2eb9c
commit c14236b8ae
1 changed files with 34 additions and 3 deletions
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37
clang/CodeGen/CGExpr.cpp
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@ -523,15 +523,46 @@ RValue CodeGenFunction::EmitCastExpr(const CastExpr *E) {
}
RValue CodeGenFunction::EmitCallExpr(const CallExpr *E) {
QualType Ty;
QualType CalleeTy;
llvm::Value *Callee =
EmitExprWithUsualUnaryConversions(E->getCallee(), Ty).getVal();
EmitExprWithUsualUnaryConversions(E->getCallee(), CalleeTy).getVal();
// The callee type will always be a pointer to function type, get the function
// type.
CalleeTy = cast<PointerType>(CalleeTy.getCanonicalType())->getPointeeType();
// Get information about the argument types.
FunctionTypeProto::arg_type_iterator ArgTyIt = 0, ArgTyEnd = 0;
// Calling unprototyped functions provides no argument info.
if (const FunctionTypeProto *FTP = dyn_cast<FunctionTypeProto>(CalleeTy)) {
ArgTyIt = FTP->arg_type_begin();
ArgTyEnd = FTP->arg_type_end();
}
llvm::SmallVector<llvm::Value*, 16> Args;
// FIXME: Handle struct return.
for (unsigned i = 0, e = E->getNumArgs(); i != e; ++i) {
RValue ArgVal = EmitExprWithUsualUnaryConversions(E->getArg(i), Ty);
QualType ArgTy;
RValue ArgVal = EmitExprWithUsualUnaryConversions(E->getArg(i), ArgTy);
// If this argument has prototype information, convert it.
if (ArgTyIt != ArgTyEnd) {
ArgVal = EmitConversion(ArgVal, ArgTy, *ArgTyIt++);
} else {
// Otherwise, if passing through "..." or to a function with no prototype,
// perform the "default argument promotions" (C99 6.5.2.2p6), which
// includes the usual unary conversions, but also promotes float to
// double.
if (const BuiltinType *BT =
dyn_cast<BuiltinType>(ArgTy.getCanonicalType())) {
if (BT->getKind() == BuiltinType::Float)
ArgVal = RValue::get(Builder.CreateFPExt(ArgVal.getVal(),
llvm::Type::DoubleTy,"tmp"));
}
}
if (ArgVal.isScalar())
Args.push_back(ArgVal.getVal());