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Some C backend ByVal parameter attribute support. Not yet complete.

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llvm-svn: 45864
This commit is contained in:
Evan Cheng 2008-01-11 09:12:49 +00:00
parent b10a30578e
commit ae6d80dead
1 changed files with 30 additions and 3 deletions
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33
lib/Target/CBackend/CBackend.cpp
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@ -87,6 +87,7 @@ namespace {
std::map<const Type *, std::string> TypeNames;
std::map<const ConstantFP *, unsigned> FPConstantMap;
std::set<Function*> intrinsicPrototypesAlreadyGenerated;
std::set<const Value*> ByValParams;
public:
static char ID;
@ -113,14 +114,16 @@ namespace {
printFloatingPointConstants(F);
printFunction(F);
FPConstantMap.clear();
return false;
}
virtual bool doFinalization(Module &M) {
// Free memory...
delete Mang;
FPConstantMap.clear();
TypeNames.clear();
intrinsicPrototypesAlreadyGenerated.clear();
ByValParams.clear();
return false;
}
@ -370,6 +373,10 @@ void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
if (PrintedType)
FunctionInnards << ", ";
const Type *ArgTy = *I;
if (PAL && PAL->paramHasAttr(Idx, ParamAttr::ByVal)) {
assert(isa<PointerType>(ArgTy));
ArgTy = cast<PointerType>(ArgTy)->getElementType();
}
printType(FunctionInnards, ArgTy,
/*isSigned=*/PAL && PAL->paramHasAttr(Idx, ParamAttr::SExt), "");
PrintedType = true;
@ -1885,6 +1892,12 @@ void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
else
ArgName = "";
const Type *ArgTy = I->getType();
if (PAL && PAL->paramHasAttr(Idx, ParamAttr::ByVal)) {
assert(isa<PointerType>(ArgTy));
ArgTy = cast<PointerType>(ArgTy)->getElementType();
const Value *Arg = &(*I);
ByValParams.insert(Arg);
}
printType(FunctionInnards, ArgTy,
/*isSigned=*/PAL && PAL->paramHasAttr(Idx, ParamAttr::SExt),
ArgName);
@ -2384,6 +2397,13 @@ void CWriter::visitCastInst(CastInst &I) {
// Make sure we really get a sext from bool by subtracing the bool from 0
Out << "0-";
}
// If it's a byval parameter being casted, then takes its address.
bool isByVal = ByValParams.count(I.getOperand(0));
if (isByVal) {
assert(I.getOpcode() == Instruction::BitCast &&
"ByVal aggregate parameter must ptr type");
Out << '&';
}
writeOperand(I.getOperand(0));
if (DstTy == Type::Int1Ty &&
(I.getOpcode() == Instruction::Trunc ||
@ -2675,7 +2695,12 @@ void CWriter::visitCallInst(CallInst &I) {
/*isSigned=*/PAL && PAL->paramHasAttr(Idx, ParamAttr::SExt));
Out << ')';
}
writeOperand(*AI);
// If call is expecting argument to be passed by value, then do not
// take its address.
if (PAL && PAL->paramHasAttr(Idx, ParamAttr::ByVal))
writeOperandInternal(*AI);
else
writeOperand(*AI);
PrintedArg = true;
}
Out << ')';
@ -2869,7 +2894,9 @@ void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
// Print out the -> operator if possible...
if (TmpI != E && isa<StructType>(*TmpI)) {
Out << (HasImplicitAddress ? "." : "->");
// Check if it's actually an aggregate parameter passed by value.
bool isByVal = ByValParams.count(Ptr);
Out << ((HasImplicitAddress || isByVal) ? "." : "->");
Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
I = ++TmpI;
}