LLConstant * IrStruct::getClassInfoInterfaces()
{
IF_LOG Logger::println("Building ClassInfo.interfaces");
LOG_SCOPE;
ClassDeclaration* cd = aggrdecl->isClassDeclaration();
assert(cd);
size_t n = interfacesWithVtbls.size();
assert(stripModifiers(type)->irtype->isClass()->getNumInterfaceVtbls() == n &&
"inconsistent number of interface vtables in this class");
VarDeclarationIter interfaces_idx(ClassDeclaration::classinfo->fields, 3);
if (n == 0)
return getNullValue(DtoType(interfaces_idx->type));
// Build array of:
//
// struct Interface
// {
// ClassInfo classinfo;
// void*[] vtbl;
// ptrdiff_t offset;
// }
LLSmallVector<LLConstant*, 6> constants;
constants.reserve(cd->vtblInterfaces->dim);
LLType* classinfo_type = DtoType(ClassDeclaration::classinfo->type);
LLType* voidptrptr_type = DtoType(
Type::tvoid->pointerTo()->pointerTo());
VarDeclarationIter idx(ClassDeclaration::classinfo->fields, 3);
LLStructType* interface_type = isaStruct(DtoType(idx->type->nextOf()));
assert(interface_type);
for (size_t i = 0; i < n; ++i)
{
BaseClass* it = interfacesWithVtbls[i];
IF_LOG Logger::println("Adding interface %s", it->base->toPrettyChars());
IrStruct* irinter = it->base->ir.irStruct;
assert(irinter && "interface has null IrStruct");
IrTypeClass* itc = stripModifiers(irinter->type)->irtype->isClass();
assert(itc && "null interface IrTypeClass");
// classinfo
LLConstant* ci = irinter->getClassInfoSymbol();
ci = DtoBitCast(ci, classinfo_type);
// vtbl
LLConstant* vtb;
// interface get a null
if (cd->isInterfaceDeclaration())
{
vtb = DtoConstSlice(DtoConstSize_t(0), getNullValue(voidptrptr_type));
}
else
{
ClassGlobalMap::iterator itv = interfaceVtblMap.find(it->base);
assert(itv != interfaceVtblMap.end() && "interface vtbl not found");
vtb = itv->second;
vtb = DtoBitCast(vtb, voidptrptr_type);
vtb = DtoConstSlice(DtoConstSize_t(itc->getVtblSize()), vtb);
}
// offset
LLConstant* off = DtoConstSize_t(it->offset);
// create Interface struct
LLConstant* inits[3] = { ci, vtb, off };
LLConstant* entry = LLConstantStruct::get(interface_type, llvm::makeArrayRef(inits, 3));
constants.push_back(entry);
}
// create Interface[N]
LLArrayType* array_type = llvm::ArrayType::get(interface_type, n);
// create and apply initializer
LLConstant* arr = LLConstantArray::get(array_type, constants);
classInterfacesArray->setInitializer(arr);
// return null, only baseclass provide interfaces
if (cd->vtblInterfaces->dim == 0)
{
return getNullValue(DtoType(interfaces_idx->type));
}
// only the interface explicitly implemented by this class
// (not super classes) should show in ClassInfo
LLConstant* idxs[2] = {
DtoConstSize_t(0),
DtoConstSize_t(n - cd->vtblInterfaces->dim)
};
LLConstant* ptr = llvm::ConstantExpr::getGetElementPtr(
classInterfacesArray, idxs, true);
// return as a slice
return DtoConstSlice( DtoConstSize_t(cd->vtblInterfaces->dim), ptr );
}
void DtoResolveClass(ClassDeclaration* cd)
{
// make sure the base classes are processed first
ArrayIter<BaseClass> base_iter(cd->baseclasses);
while (base_iter.more())
{
BaseClass* bc = base_iter.get();
if (bc)
{
bc->base->codegen(Type::sir);
}
base_iter.next();
}
if (cd->ir.resolved) return;
cd->ir.resolved = true;
Logger::println("DtoResolveClass(%s): %s", cd->toPrettyChars(), cd->loc.toChars());
LOG_SCOPE;
// make sure type exists
DtoType(cd->type);
// create IrStruct
assert(cd->ir.irStruct == NULL);
IrStruct* irstruct = new IrStruct(cd);
cd->ir.irStruct = irstruct;
// make sure all fields really get their ir field
ArrayIter<VarDeclaration> it(cd->fields);
for (; !it.done(); it.next())
{
VarDeclaration* vd = it.get();
if (vd->ir.irField == NULL) {
new IrField(vd);
} else {
IF_LOG Logger::println("class field already exists!!!");
}
}
bool needs_def = mustDefineSymbol(cd);
// emit the ClassZ symbol
LLGlobalVariable* ClassZ = irstruct->getClassInfoSymbol();
// emit the interfaceInfosZ symbol if necessary
if (cd->vtblInterfaces && cd->vtblInterfaces->dim > 0)
irstruct->getInterfaceArraySymbol(); // initializer is applied when it's built
// interface only emit typeinfo and classinfo
if (cd->isInterfaceDeclaration())
{
irstruct->initializeInterface();
}
else
{
// emit the initZ symbol
LLGlobalVariable* initZ = irstruct->getInitSymbol();
// emit the vtblZ symbol
LLGlobalVariable* vtblZ = irstruct->getVtblSymbol();
// perform definition
if (needs_def)
{
// set symbol initializers
initZ->setInitializer(irstruct->getDefaultInit());
vtblZ->setInitializer(irstruct->getVtblInit());
}
}
// emit members
if (cd->members)
{
ArrayIter<Dsymbol> it(*cd->members);
while (!it.done())
{
Dsymbol* member = it.get();
if (member)
member->codegen(Type::sir);
it.next();
}
}
if (needs_def)
{
// emit typeinfo
DtoTypeInfoOf(cd->type);
// define classinfo
ClassZ->setInitializer(irstruct->getClassInfoInit());
}
}
