void visit(ClassDeclaration *decl) override {
IF_LOG Logger::println("ClassDeclaration::codegen: '%s'",
decl->toPrettyChars());
LOG_SCOPE
assert(!irs->dcomputetarget);
if (decl->ir->isDefined()) {
return;
}
if (decl->type->ty == Terror) {
error(decl->loc, "had semantic errors when compiling");
decl->ir->setDefined();
return;
}
if (decl->members && decl->symtab) {
DtoResolveClass(decl);
decl->ir->setDefined();
for (auto m : *decl->members) {
m->accept(this);
}
IrAggr *ir = getIrAggr(decl);
const auto lwc = DtoLinkage(decl);
auto &initZ = ir->getInitSymbol();
auto initGlobal = llvm::cast<LLGlobalVariable>(initZ);
initZ = irs->setGlobalVarInitializer(initGlobal, ir->getDefaultInit());
setLinkage(lwc, initGlobal);
llvm::GlobalVariable *vtbl = ir->getVtblSymbol();
vtbl->setInitializer(ir->getVtblInit());
setLinkage(lwc, vtbl);
llvm::GlobalVariable *classZ = ir->getClassInfoSymbol();
if (!isSpeculativeType(decl->type)) {
classZ->setInitializer(ir->getClassInfoInit());
setLinkage(lwc, classZ);
}
}
}
LLConstant* DtoDefineClassInfo(ClassDeclaration* cd)
{
// The layout is:
// {
// void **vptr;
// monitor_t monitor;
// byte[] initializer; // static initialization data
// char[] name; // class name
// void *[] vtbl;
// Interface[] interfaces;
// ClassInfo *base; // base class
// void *destructor;
// void *invariant; // class invariant
// uint flags;
// void *deallocator;
// OffsetTypeInfo[] offTi;
// void *defaultConstructor;
// version(D_Version2)
// immutable(void)* m_RTInfo;
// else
// TypeInfo typeinfo; // since dmd 1.045
// }
Logger::println("DtoDefineClassInfo(%s)", cd->toChars());
LOG_SCOPE;
assert(cd->type->ty == Tclass);
TypeClass* cdty = static_cast<TypeClass*>(cd->type);
IrAggr* ir = cd->ir.irAggr;
assert(ir);
ClassDeclaration* cinfo = ClassDeclaration::classinfo;
if (cinfo->fields.dim != 12)
{
error("object.d ClassInfo class is incorrect");
fatal();
}
// use the rtti builder
RTTIBuilder b(ClassDeclaration::classinfo);
LLConstant* c;
LLType* voidPtr = getVoidPtrType();
LLType* voidPtrPtr = getPtrToType(voidPtr);
// byte[] init
if (cd->isInterfaceDeclaration())
{
b.push_null_void_array();
}
else
{
LLType* cd_type = cdty->irtype->isClass()->getMemoryLLType();
size_t initsz = getTypePaddedSize(cd_type);
b.push_void_array(initsz, ir->getInitSymbol());
}
// class name
// code from dmd
const char *name = cd->ident->toChars();
size_t namelen = strlen(name);
if (!(namelen > 9 && memcmp(name, "TypeInfo_", 9) == 0))
{
name = cd->toPrettyChars();
namelen = strlen(name);
}
b.push_string(name);
// vtbl array
if (cd->isInterfaceDeclaration())
{
b.push_array(0, getNullValue(voidPtrPtr));
}
else
{
c = DtoBitCast(ir->getVtblSymbol(), voidPtrPtr);
b.push_array(cd->vtbl.dim, c);
}
// interfaces array
b.push(ir->getClassInfoInterfaces());
// base classinfo
// interfaces never get a base , just the interfaces[]
if (cd->baseClass && !cd->isInterfaceDeclaration())
b.push_classinfo(cd->baseClass);
else
b.push_null(cinfo->type);
// destructor
if (cd->isInterfaceDeclaration())
b.push_null_vp();
else
b.push(build_class_dtor(cd));
// invariant
VarDeclaration* invVar = static_cast<VarDeclaration*>(cinfo->fields.data[6]);
b.push_funcptr(cd->inv, invVar->type);
// uint flags
unsigned flags;
if (cd->isInterfaceDeclaration())
flags = 4 | cd->isCOMinterface() | 32;
else
flags = build_classinfo_flags(cd);
b.push_uint(flags);
// deallocator
b.push_funcptr(cd->aggDelete, Type::tvoid->pointerTo());
// offset typeinfo
VarDeclaration* offTiVar = static_cast<VarDeclaration*>(cinfo->fields.data[9]);
#if GENERATE_OFFTI
if (cd->isInterfaceDeclaration())
b.push_null(offTiVar->type);
else
b.push(build_offti_array(cd, DtoType(offTiVar->type)));
#else // GENERATE_OFFTI
b.push_null(offTiVar->type);
#endif // GENERATE_OFFTI
// default constructor
VarDeclaration* defConstructorVar = static_cast<VarDeclaration*>(cinfo->fields.data[10]);
b.push_funcptr(cd->defaultCtor, defConstructorVar->type);
// immutable(void)* m_RTInfo;
// The cases where getRTInfo is null are not quite here, but the code is
// modelled after what DMD does.
if (cd->getRTInfo)
b.push(cd->getRTInfo->toConstElem(gIR));
else if (flags & 2)
b.push_size_as_vp(0); // no pointers
else
b.push_size_as_vp(1); // has pointers
/*size_t n = inits.size();
for (size_t i=0; i<n; ++i)
{
Logger::cout() << "inits[" << i << "]: " << *inits[i] << '\n';
}*/
// build the initializer
LLType *initType = ir->classInfo->getType()->getContainedType(0);
LLConstant* finalinit = b.get_constant(isaStruct(initType));
//Logger::cout() << "built the classinfo initializer:\n" << *finalinit <<'\n';
ir->constClassInfo = finalinit;
// sanity check
assert(finalinit->getType() == initType &&
"__ClassZ initializer does not match the ClassInfo type");
// return initializer
return finalinit;
}
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 IrAggr
assert(cd->ir.irAggr == NULL);
IrAggr* irAggr = new IrAggr(cd);
cd->ir.irAggr = irAggr;
// 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 = irAggr->getClassInfoSymbol();
// emit the interfaceInfosZ symbol if necessary
if (cd->vtblInterfaces && cd->vtblInterfaces->dim > 0)
irAggr->getInterfaceArraySymbol(); // initializer is applied when it's built
// interface only emit typeinfo and classinfo
if (cd->isInterfaceDeclaration())
{
irAggr->initializeInterface();
}
else
{
// emit the initZ symbol
LLGlobalVariable* initZ = irAggr->getInitSymbol();
// emit the vtblZ symbol
LLGlobalVariable* vtblZ = irAggr->getVtblSymbol();
// perform definition
if (needs_def)
{
// set symbol initializers
initZ->setInitializer(irAggr->getDefaultInit());
vtblZ->setInitializer(irAggr->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(irAggr->getClassInfoInit());
}
}