static uint64_t LookupFieldBitOffset(CodeGen::CodeGenModule &CGM,
const ObjCInterfaceDecl *OID,
const ObjCImplementationDecl *ID,
const ObjCIvarDecl *Ivar) {
const ObjCInterfaceDecl *Container = Ivar->getContainingInterface();
// FIXME: We should eliminate the need to have ObjCImplementationDecl passed
// in here; it should never be necessary because that should be the lexical
// decl context for the ivar.
// If we know have an implementation (and the ivar is in it) then
// look up in the implementation layout.
const ASTRecordLayout *RL;
if (ID && ID->getClassInterface() == Container)
RL = &CGM.getContext().getASTObjCImplementationLayout(ID);
else
RL = &CGM.getContext().getASTObjCInterfaceLayout(Container);
// Compute field index.
//
// FIXME: The index here is closely tied to how ASTContext::getObjCLayout is
// implemented. This should be fixed to get the information from the layout
// directly.
unsigned Index = 0;
for (const ObjCIvarDecl *IVD = Container->all_declared_ivar_begin();
IVD; IVD = IVD->getNextIvar()) {
if (Ivar == IVD)
break;
++Index;
}
assert(Index < RL->getFieldCount() && "Ivar is not inside record layout!");
return RL->getFieldOffset(Index);
}
uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
const ObjCImplementationDecl *OID,
const ObjCIvarDecl *Ivar) {
return LookupFieldBitOffset(CGM, OID->getClassInterface(), OID, Ivar) /
CGM.getContext().getCharWidth();
}
uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
const ObjCInterfaceDecl *OID,
const ObjCIvarDecl *Ivar) {
return LookupFieldBitOffset(CGM, OID, nullptr, Ivar) /
CGM.getContext().getCharWidth();
}