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Code gen for pointer-to-datamember - WIP. 

llvm-svn: 84771
This commit is contained in:
Fariborz Jahanian 2009-10-21 18:38:00 +00:00
parent 945fec05dd
commit 4ebdff5e1c
3 changed files with 47 additions and 0 deletions
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21
clang/lib/CodeGen/CGExpr.cpp
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@ -866,6 +866,9 @@ LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
llvm::Value *V = LocalDeclMap[IPD];
assert(V && "BlockVarDecl not entered in LocalDeclMap?");
return LValue::MakeAddr(V, MakeQualifiers(E->getType()));
} else if (const QualifiedDeclRefExpr *QDRExpr =
dyn_cast<QualifiedDeclRefExpr>(E)) {
return EmitPointerToDataMemberLValue(QDRExpr);
}
assert(0 && "Unimp declref");
//an invalid LValue, but the assert will
@ -1513,6 +1516,24 @@ LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
}
LValue CodeGenFunction::EmitPointerToDataMemberLValue(
const QualifiedDeclRefExpr *E) {
const FieldDecl *Field = cast<FieldDecl>(E->getDecl());
const NestedNameSpecifier *NNSpec = E->getQualifier();
const Type *NNSpecType = NNSpec->getAsType();
QualType NNSpecTy = getContext().getCanonicalType(QualType(NNSpecType, 0));
NNSpecTy = getContext().getPointerType(NNSpecTy);
llvm::Value *V = llvm::Constant::getNullValue(ConvertType(NNSpecTy));
LValue MemExpLV = EmitLValueForField(V, const_cast<FieldDecl*>(Field),
/*isUnion*/false, /*Qualifiers*/0);
const llvm::Type* ResultType = ConvertType(
getContext().getPointerDiffType());
V = Builder.CreatePtrToInt(MemExpLV.getAddress(), ResultType,
"datamember");
LValue LV = LValue::MakeAddr(V, MakeQualifiers(E->getType()));
return LV;
}
RValue CodeGenFunction::EmitCall(llvm::Value *Callee, QualType CalleeType,
CallExpr::const_arg_iterator ArgBeg,
CallExpr::const_arg_iterator ArgEnd,

1
clang/lib/CodeGen/CodeGenFunction.h
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@ -819,6 +819,7 @@ public:
LValue EmitConditionalOperatorLValue(const ConditionalOperator *E);
LValue EmitCastLValue(const CastExpr *E);
LValue EmitNullInitializationLValue(const CXXZeroInitValueExpr *E);
LValue EmitPointerToDataMemberLValue(const QualifiedDeclRefExpr *E);
llvm::Value *EmitIvarOffset(const ObjCInterfaceDecl *Interface,
const ObjCIvarDecl *Ivar);

25
clang/test/CodeGenCXX/ptr-to-datamember.cpp Normal file
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@ -0,0 +1,25 @@
// RUN: clang-cc -emit-llvm -o - %s
extern "C" int printf(...);
class A {
public:
A() : f(1.0), d(2.0), Ai(100) {}
float f;
double d;
int Ai;
};
int main()
{
A a1;
int A::* pa = &A::Ai;
float A::* pf = &A::f;
double A::* pd = &A::d;
printf("%d %d %d\n", &A::Ai, &A::f, &A::d);
// FIXME. NYI
// printf(" %d, %f, %f \n", a1.*pa, a1.f, a1.d);
}