void TypeChecker::markInvalidGenericSignature(ValueDecl *VD) {
GenericParamList *genericParams;
if (auto *AFD = dyn_cast<AbstractFunctionDecl>(VD))
genericParams = AFD->getGenericParams();
else
genericParams = cast<GenericTypeDecl>(VD)->getGenericParams();
// If there aren't any generic parameters at this level, we're done.
if (genericParams == nullptr)
return;
DeclContext *DC = VD->getDeclContext();
ArchetypeBuilder builder = createArchetypeBuilder(DC->getParentModule());
if (auto sig = DC->getGenericSignatureOfContext())
builder.addGenericSignature(sig, true);
// Visit each of the generic parameters.
for (auto param : *genericParams)
builder.addGenericParameter(param);
// Wire up the archetypes.
for (auto GP : *genericParams)
GP->setArchetype(builder.getArchetype(GP));
genericParams->setAllArchetypes(
Context.AllocateCopy(builder.getAllArchetypes()));
}
GenericEnvironment *
TypeChecker::markInvalidGenericSignature(DeclContext *DC) {
GenericParamList *genericParams = DC->getGenericParamsOfContext();
GenericSignature *genericSig = DC->getGenericSignatureOfContext();
// Build new archetypes without any generic requirements.
DeclContext *parentDC = DC->getParent();
auto builder = createArchetypeBuilder(parentDC->getParentModule());
auto parentSig = parentDC->getGenericSignatureOfContext();
auto parentEnv = parentDC->getGenericEnvironmentOfContext();
assert(parentSig != nullptr || DC->isInnermostContextGeneric());
if (parentSig != nullptr)
builder.addGenericSignature(parentSig, parentEnv);
if (DC->isInnermostContextGeneric()) {
// Visit each of the generic parameters.
for (auto param : *genericParams)
builder.addGenericParameter(param);
}
// Wire up the archetypes.
auto genericEnv = builder.getGenericEnvironment(
genericSig->getGenericParams());
return genericEnv;
}
/// Check the generic parameters in the given generic parameter list (and its
/// parent generic parameter lists) according to the given resolver.
void TypeChecker::checkGenericParamList(GenericSignatureBuilder *builder,
GenericParamList *genericParams,
GenericSignature *parentSig,
GenericTypeResolver *resolver) {
// If there is a parent context, add the generic parameters and requirements
// from that context.
if (builder)
builder->addGenericSignature(parentSig);
// If there aren't any generic parameters at this level, we're done.
if (!genericParams)
return;
assert(genericParams->size() > 0 &&
"Parsed an empty generic parameter list?");
// Determine where and how to perform name lookup for the generic
// parameter lists and where clause.
TypeResolutionOptions options;
DeclContext *lookupDC = genericParams->begin()[0]->getDeclContext();
if (!lookupDC->isModuleScopeContext()) {
assert((isa<GenericTypeDecl>(lookupDC) ||
isa<ExtensionDecl>(lookupDC) ||
isa<AbstractFunctionDecl>(lookupDC) ||
isa<SubscriptDecl>(lookupDC)) &&
"not a proper generic parameter context?");
options = TR_GenericSignature;
}
// First, add the generic parameters to the generic signature builder.
// Do this before checking the inheritance clause, since it may
// itself be dependent on one of these parameters.
if (builder) {
for (auto param : *genericParams)
builder->addGenericParameter(param);
}
// Now, check the inheritance clauses of each parameter.
for (auto param : *genericParams) {
checkInheritanceClause(param, resolver);
if (builder)
builder->addGenericParameterRequirements(param);
}
// Visit each of the requirements, adding them to the builder.
// Add the requirements clause to the builder, validating the types in
// the requirements clause along the way.
for (auto &req : genericParams->getRequirements()) {
if (validateRequirement(genericParams->getWhereLoc(), req, lookupDC,
options, resolver))
continue;
if (builder &&
isErrorResult(builder->addRequirement(&req,
lookupDC->getParentModule())))
req.setInvalid();
}
}
SILLinkage SILDeclRef::getLinkage(ForDefinition_t forDefinition) const {
// Anonymous functions have shared linkage.
// FIXME: This should really be the linkage of the parent function.
if (getAbstractClosureExpr())
return SILLinkage::Shared;
// Native function-local declarations have shared linkage.
// FIXME: @objc declarations should be too, but we currently have no way
// of marking them "used" other than making them external.
ValueDecl *d = getDecl();
DeclContext *moduleContext = d->getDeclContext();
while (!moduleContext->isModuleScopeContext()) {
if (!isForeign && moduleContext->isLocalContext())
return SILLinkage::Shared;
moduleContext = moduleContext->getParent();
}
// Currying and calling convention thunks have shared linkage.
if (isThunk())
// If a function declares a @_cdecl name, its native-to-foreign thunk
// is exported with the visibility of the function.
if (!isNativeToForeignThunk() || !d->getAttrs().hasAttribute<CDeclAttr>())
return SILLinkage::Shared;
// Enum constructors are essentially the same as thunks, they are
// emitted by need and have shared linkage.
if (kind == Kind::EnumElement)
return SILLinkage::Shared;
// Declarations imported from Clang modules have shared linkage.
const SILLinkage ClangLinkage = SILLinkage::Shared;
if (isClangImported())
return ClangLinkage;
// Declarations that were derived on behalf of types in Clang modules get
// shared linkage.
if (auto *FD = dyn_cast<FuncDecl>(d)) {
if (auto derivedFor = FD->getDerivedForTypeDecl())
if (isa<ClangModuleUnit>(derivedFor->getModuleScopeContext()))
return ClangLinkage;
}
// If the module is being built with -sil-serialize-all, everything has
// to have public linkage.
if (moduleContext->getParentModule()->getResilienceStrategy()
== ResilienceStrategy::Fragile) {
return (forDefinition ? SILLinkage::Public : SILLinkage::PublicExternal);
}
// Otherwise, linkage is determined by accessibility at the AST level.
switch (d->getEffectiveAccess()) {
case Accessibility::Private:
return (forDefinition ? SILLinkage::Private : SILLinkage::PrivateExternal);
case Accessibility::Internal:
return (forDefinition ? SILLinkage::Hidden : SILLinkage::HiddenExternal);
default:
return (forDefinition ? SILLinkage::Public : SILLinkage::PublicExternal);
}
}
std::pair<SynthesizedExtensionInfo, ExtensionMergeInfo>
isApplicable(ExtensionDecl *Ext, bool IsSynthesized,
ExtensionDecl *EnablingExt, NormalProtocolConformance *Conf) {
SynthesizedExtensionInfo Result(IsSynthesized, EnablingExt);
ExtensionMergeInfo MergeInfo;
MergeInfo.HasDocComment = !Ext->getRawComment().isEmpty();
MergeInfo.InheritsCount = countInherits(Ext);
// There's (up to) two extensions here: the extension with the items that we
// might be merging, plus the "enabling extension", which is the route
// through which \c Ext itself applies, e.g. extension SomeProtocol {}
// extension SomeType: SomeProtocol where T: SomeProtocol {}. The former is
// Ext and the latter is EnablingExt/Conf. Either of these can be
// conditional in ways that need to be considered when merging.
auto conformanceIsConditional =
Conf && !Conf->getConditionalRequirements().empty();
if (!Ext->isConstrainedExtension() && !conformanceIsConditional) {
if (IncludeUnconditional)
Result.Ext = Ext;
return {Result, MergeInfo};
}
auto handleRequirements = [&](SubstitutionMap subMap,
GenericSignature *GenericSig,
ArrayRef<Requirement> Reqs) {
for (auto Req : Reqs) {
auto Kind = Req.getKind();
// FIXME: Could do something here
if (Kind == RequirementKind::Layout)
continue;
auto First = Req.getFirstType();
auto Second = Req.getSecondType();
if (!BaseType->isExistentialType()) {
First = First.subst(subMap);
Second = Second.subst(subMap);
if (!First || !Second) {
// Substitution with interface type bases can only fail
// if a concrete type fails to conform to a protocol.
// In this case, just give up on the extension altogether.
return true;
}
}
switch (Kind) {
case RequirementKind::Conformance:
case RequirementKind::Superclass:
// FIXME: This could be more accurate; check
// conformance instead of subtyping
if (!canPossiblyConvertTo(First, Second, *DC))
return true;
else if (!isConvertibleTo(First, Second, *DC))
MergeInfo.addRequirement(GenericSig, First, Second, Kind);
break;
case RequirementKind::SameType:
if (!canPossiblyEqual(First, Second, *DC)) {
return true;
} else if (!First->isEqual(Second)) {
MergeInfo.addRequirement(GenericSig, First, Second, Kind);
}
break;
case RequirementKind::Layout:
llvm_unreachable("Handled above");
}
}
return false;
};
auto *M = DC->getParentModule();
if (Ext->isConstrainedExtension()) {
// Get the substitutions from the generic signature of
// the extension to the interface types of the base type's
// declaration.
SubstitutionMap subMap;
if (!BaseType->isExistentialType())
subMap = BaseType->getContextSubstitutionMap(M, Ext);
assert(Ext->getGenericSignature() && "No generic signature.");
auto GenericSig = Ext->getGenericSignature();
if (handleRequirements(subMap, GenericSig, GenericSig->getRequirements()))
return {Result, MergeInfo};
}
if (Conf && handleRequirements(Conf->getSubstitutions(M),
Conf->getGenericSignature(),
Conf->getConditionalRequirements()))
return {Result, MergeInfo};
Result.Ext = Ext;
return {Result, MergeInfo};
}
std::pair<SynthesizedExtensionInfo, ExtensionMergeInfo>
isApplicable(ExtensionDecl *Ext, bool IsSynthesized) {
SynthesizedExtensionInfo Result(IsSynthesized);
ExtensionMergeInfo MergeInfo;
MergeInfo.HasDocComment = !Ext->getRawComment().isEmpty();
MergeInfo.InheritsCount = countInherits(Ext);
if (!Ext->isConstrainedExtension()) {
if (IncludeUnconditional)
Result.Ext = Ext;
return {Result, MergeInfo};
}
// Get the substitutions from the generic signature of
// the extension to the interface types of the base type's
// declaration.
auto *M = DC->getParentModule();
SubstitutionMap subMap;
if (!BaseType->isExistentialType())
subMap = BaseType->getContextSubstitutionMap(M, Ext);
assert(Ext->getGenericSignature() && "No generic signature.");
for (auto Req : Ext->getGenericSignature()->getRequirements()) {
auto Kind = Req.getKind();
// FIXME: Could do something here
if (Kind == RequirementKind::Layout)
continue;
auto First = Req.getFirstType();
auto Second = Req.getSecondType();
if (!BaseType->isExistentialType()) {
First = First.subst(subMap);
Second = Second.subst(subMap);
if (!First || !Second) {
// Substitution with interface type bases can only fail
// if a concrete type fails to conform to a protocol.
// In this case, just give up on the extension altogether.
return {Result, MergeInfo};
}
}
switch (Kind) {
case RequirementKind::Conformance:
case RequirementKind::Superclass:
// FIXME: This could be more accurate; check
// conformance instead of subtyping
if (!canPossiblyConvertTo(First, Second, *DC))
return {Result, MergeInfo};
else if (!isConvertibleTo(First, Second, *DC))
MergeInfo.addRequirement(First, Second, Kind);
break;
case RequirementKind::SameType:
if (!canPossiblyEqual(First, Second, *DC)) {
return {Result, MergeInfo};
} else if (!First->isEqual(Second)) {
MergeInfo.addRequirement(First, Second, Kind);
}
break;
case RequirementKind::Layout:
llvm_unreachable("Handled above");
}
}
Result.Ext = Ext;
return {Result, MergeInfo};
}