static SILValue getBehaviorInitStorageFn(SILGenFunction &SGF,
VarDecl *behaviorVar) {
Mangle::ASTMangler NewMangler;
std::string behaviorInitName = NewMangler.mangleBehaviorInitThunk(behaviorVar);
SILFunction *thunkFn;
// Skip out early if we already emitted this thunk.
if (auto existing = SGF.SGM.M.lookUpFunction(behaviorInitName)) {
thunkFn = existing;
} else {
auto init = behaviorVar->getBehavior()->InitStorageDecl.getDecl();
auto initFn = SGF.SGM.getFunction(SILDeclRef(init), NotForDefinition);
// Emit a thunk to inject the `self` metatype and implode tuples.
auto storageVar = behaviorVar->getBehavior()->StorageDecl;
auto selfTy = behaviorVar->getDeclContext()->getDeclaredInterfaceType();
auto initTy = SGF.getLoweredType(selfTy).getFieldType(behaviorVar,
SGF.SGM.M);
auto storageTy = SGF.getLoweredType(selfTy).getFieldType(storageVar,
SGF.SGM.M);
auto initConstantTy = initFn->getLoweredType().castTo<SILFunctionType>();
auto param = SILParameterInfo(initTy.getASTType(),
initTy.isAddress() ? ParameterConvention::Indirect_In
: ParameterConvention::Direct_Owned);
auto result = SILResultInfo(storageTy.getASTType(),
storageTy.isAddress() ? ResultConvention::Indirect
: ResultConvention::Owned);
initConstantTy = SILFunctionType::get(initConstantTy->getGenericSignature(),
initConstantTy->getExtInfo(),
SILCoroutineKind::None,
ParameterConvention::Direct_Unowned,
param,
/*yields*/ {},
result,
// TODO: throwing initializer?
None,
SGF.getASTContext());
// TODO: Generate the body of the thunk.
thunkFn = SGF.SGM.M.getOrCreateFunction(SILLocation(behaviorVar),
behaviorInitName,
SILLinkage::PrivateExternal,
initConstantTy,
IsBare, IsTransparent, IsSerialized);
}
return SGF.B.createFunctionRef(behaviorVar, thunkFn);
}
