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ABI handling: Implement coercion for argument types (in addition to 

return types).

llvm-svn: 63645
This commit is contained in:
Daniel Dunbar 2009-02-03 19:12:28 +00:00
parent 712bfa6478
commit 2f219b0770
1 changed files with 39 additions and 4 deletions
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41
clang/lib/CodeGen/CGCall.cpp
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@ -926,6 +926,9 @@ CodeGenTypes::GetFunctionType(const CGFunctionInfo &FI, bool IsVariadic) {
break;
case ABIArgInfo::Coerce:
ArgTys.push_back(AI.getCoerceToType());
break;
case ABIArgInfo::StructRet:
assert(0 && "Invalid ABI kind for non-return argument");
@ -1005,9 +1008,11 @@ void CodeGenModule::ConstructAttributeList(const CGFunctionInfo &FI,
switch (AI.getKind()) {
case ABIArgInfo::StructRet:
case ABIArgInfo::Coerce:
assert(0 && "Invalid ABI kind for non-return argument");
case ABIArgInfo::Coerce:
break;
case ABIArgInfo::ByVal:
Attributes |= llvm::Attribute::ByVal;
assert(AI.getByValAlignment() == 0 && "FIXME: alignment unhandled");
@ -1105,7 +1110,21 @@ void CodeGenFunction::EmitFunctionProlog(const CGFunctionInfo &FI,
case ABIArgInfo::Ignore:
break;
case ABIArgInfo::Coerce:
case ABIArgInfo::Coerce: {
assert(AI != Fn->arg_end() && "Argument mismatch!");
// FIXME: This is very wasteful; EmitParmDecl is just going to
// drop the result in a new alloca anyway, so we could just
// store into that directly if we broke the abstraction down
// more.
llvm::Value *V = CreateTempAlloca(ConvertType(Ty), "coerce");
CreateCoercedStore(AI, V, *this);
// Match to what EmitParmDecl is expecting for this type.
if (!CodeGenFunction::hasAggregateLLVMType(Ty))
V = Builder.CreateLoad(V);
EmitParmDecl(*Arg, V);
break;
}
case ABIArgInfo::StructRet:
assert(0 && "Invalid ABI kind for non-return argument");
}
@ -1213,8 +1232,23 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
case ABIArgInfo::Ignore:
break;
case ABIArgInfo::Coerce: {
// FIXME: Avoid the conversion through memory if possible.
llvm::Value *SrcPtr;
if (RV.isScalar()) {
SrcPtr = CreateTempAlloca(ConvertType(I->second), "coerce");
Builder.CreateStore(RV.getScalarVal(), SrcPtr);
} else if (RV.isComplex()) {
SrcPtr = CreateTempAlloca(ConvertType(I->second), "coerce");
StoreComplexToAddr(RV.getComplexVal(), SrcPtr, false);
} else
SrcPtr = RV.getAggregateAddr();
Args.push_back(CreateCoercedLoad(SrcPtr, ArgInfo.getCoerceToType(),
*this));
break;
}
case ABIArgInfo::StructRet:
case ABIArgInfo::Coerce:
assert(0 && "Invalid ABI kind for non-return argument");
break;
@ -1266,6 +1300,7 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
return RValue::get(llvm::UndefValue::get(ConvertType(RetTy)));
case ABIArgInfo::Coerce: {
// FIXME: Avoid the conversion through memory if possible.
llvm::Value *V = CreateTempAlloca(ConvertType(RetTy), "coerce");
CreateCoercedStore(CI, V, *this);
if (RetTy->isAnyComplexType())