bool Context::isThunkSymbol(llvm::StringRef MangledName) {
if (isMangledName(MangledName)) {
// First do a quick check
if (MangledName.endswith("TA") || // partial application forwarder
MangledName.endswith("Ta") || // ObjC partial application forwarder
MangledName.endswith("To") || // swift-as-ObjC thunk
MangledName.endswith("TO") || // ObjC-as-swift thunk
MangledName.endswith("TR") || // reabstraction thunk helper function
MangledName.endswith("Tr") || // reabstraction thunk
MangledName.endswith("TW") || // protocol witness thunk
MangledName.endswith("fC")) { // allocating constructor
// To avoid false positives, we need to fully demangle the symbol.
NodePointer Nd = D->demangleSymbol(MangledName);
if (!Nd || Nd->getKind() != Node::Kind::Global ||
Nd->getNumChildren() == 0)
return false;
switch (Nd->getFirstChild()->getKind()) {
case Node::Kind::ObjCAttribute:
case Node::Kind::NonObjCAttribute:
case Node::Kind::PartialApplyObjCForwarder:
case Node::Kind::PartialApplyForwarder:
case Node::Kind::ReabstractionThunkHelper:
case Node::Kind::ReabstractionThunk:
case Node::Kind::ProtocolWitness:
case Node::Kind::Allocator:
return true;
default:
break;
}
}
return false;
}
if (MangledName.startswith("_T")) {
// Old mangling.
StringRef Remaining = MangledName.substr(2);
if (Remaining.startswith("To") || // swift-as-ObjC thunk
Remaining.startswith("TO") || // ObjC-as-swift thunk
Remaining.startswith("PA_") || // partial application forwarder
Remaining.startswith("PAo_")) { // ObjC partial application forwarder
return true;
}
}
return false;
}
// Build a demangled type tree for a type.
Demangle::NodePointer
swift::_swift_buildDemanglingForMetadata(const Metadata *type,
Demangle::Demangler &Dem) {
using namespace Demangle;
switch (type->getKind()) {
case MetadataKind::Class:
case MetadataKind::Enum:
case MetadataKind::Optional:
case MetadataKind::Struct:
return _buildDemanglingForNominalType(type, Dem);
case MetadataKind::ObjCClassWrapper: {
#if SWIFT_OBJC_INTEROP
auto objcWrapper = static_cast<const ObjCClassWrapperMetadata *>(type);
const char *className = class_getName(objcWrapper->getObjCClassObject());
// ObjC classes mangle as being in the magic "__ObjC" module.
auto module = Dem.createNode(Node::Kind::Module, "__ObjC");
auto node = Dem.createNode(Node::Kind::Class);
node->addChild(module, Dem);
node->addChild(Dem.createNode(Node::Kind::Identifier,
llvm::StringRef(className)), Dem);
return node;
#else
assert(false && "no ObjC interop");
return nullptr;
#endif
}
case MetadataKind::ForeignClass: {
auto foreign = static_cast<const ForeignClassMetadata *>(type);
return Dem.demangleType(foreign->getName());
}
case MetadataKind::Existential: {
auto exis = static_cast<const ExistentialTypeMetadata *>(type);
std::vector<const ProtocolDescriptor *> protocols;
protocols.reserve(exis->Protocols.NumProtocols);
for (unsigned i = 0, e = exis->Protocols.NumProtocols; i < e; ++i)
protocols.push_back(exis->Protocols[i]);
auto type_list = Dem.createNode(Node::Kind::TypeList);
auto proto_list = Dem.createNode(Node::Kind::ProtocolList);
proto_list->addChild(type_list, Dem);
// The protocol descriptors should be pre-sorted since the compiler will
// only ever make a swift_getExistentialTypeMetadata invocation using
// its canonical ordering of protocols.
for (auto *protocol : protocols) {
// The protocol name is mangled as a type symbol, with the _Tt prefix.
StringRef ProtoName(protocol->Name);
NodePointer protocolNode = Dem.demangleSymbol(ProtoName);
// ObjC protocol names aren't mangled.
if (!protocolNode) {
auto module = Dem.createNode(Node::Kind::Module,
MANGLING_MODULE_OBJC);
auto node = Dem.createNode(Node::Kind::Protocol);
node->addChild(module, Dem);
node->addChild(Dem.createNode(Node::Kind::Identifier,
llvm::StringRef(protocol->Name)), Dem);
auto typeNode = Dem.createNode(Node::Kind::Type);
typeNode->addChild(node, Dem);
type_list->addChild(typeNode, Dem);
continue;
}
// FIXME: We have to dig through a ridiculous number of nodes to get
// to the Protocol node here.
protocolNode = protocolNode->getChild(0); // Global -> TypeMangling
protocolNode = protocolNode->getChild(0); // TypeMangling -> Type
protocolNode = protocolNode->getChild(0); // Type -> ProtocolList
protocolNode = protocolNode->getChild(0); // ProtocolList -> TypeList
protocolNode = protocolNode->getChild(0); // TypeList -> Type
assert(protocolNode->getKind() == Node::Kind::Type);
assert(protocolNode->getChild(0)->getKind() == Node::Kind::Protocol);
type_list->addChild(protocolNode, Dem);
}
if (auto superclass = exis->getSuperclassConstraint()) {
// If there is a superclass constraint, we mangle it specially.
auto result = Dem.createNode(Node::Kind::ProtocolListWithClass);
auto superclassNode = _swift_buildDemanglingForMetadata(superclass, Dem);
result->addChild(proto_list, Dem);
result->addChild(superclassNode, Dem);
return result;
}
if (exis->isClassBounded()) {
// Check if the class constraint is implied by any of our
// protocols.
bool requiresClassImplicit = false;
for (auto *protocol : protocols) {
if (protocol->Flags.getClassConstraint()
== ProtocolClassConstraint::Class)
requiresClassImplicit = true;
}
// If it was implied, we don't do anything special.
if (requiresClassImplicit)
return proto_list;
// If the existential type has an explicit AnyObject constraint,
// we must mangle it as such.
auto result = Dem.createNode(Node::Kind::ProtocolListWithAnyObject);
result->addChild(proto_list, Dem);
return result;
}
// Just a simple composition of protocols.
return proto_list;
}
case MetadataKind::ExistentialMetatype: {
auto metatype = static_cast<const ExistentialMetatypeMetadata *>(type);
auto instance = _swift_buildDemanglingForMetadata(metatype->InstanceType,
Dem);
auto node = Dem.createNode(Node::Kind::ExistentialMetatype);
node->addChild(instance, Dem);
return node;
}
case MetadataKind::Function: {
auto func = static_cast<const FunctionTypeMetadata *>(type);
Node::Kind kind;
switch (func->getConvention()) {
case FunctionMetadataConvention::Swift:
kind = Node::Kind::FunctionType;
break;
case FunctionMetadataConvention::Block:
kind = Node::Kind::ObjCBlock;
break;
case FunctionMetadataConvention::CFunctionPointer:
kind = Node::Kind::CFunctionPointer;
break;
case FunctionMetadataConvention::Thin:
kind = Node::Kind::ThinFunctionType;
break;
}
std::vector<NodePointer> inputs;
for (unsigned i = 0, e = func->getNumParameters(); i < e; ++i) {
auto param = func->getParameter(i);
auto flags = func->getParameterFlags(i);
auto input = _swift_buildDemanglingForMetadata(param, Dem);
if (flags.isInOut()) {
NodePointer inout = Dem.createNode(Node::Kind::InOut);
inout->addChild(input, Dem);
input = inout;
} else if (flags.isShared()) {
NodePointer shared = Dem.createNode(Node::Kind::Shared);
shared->addChild(input, Dem);
input = shared;
}
inputs.push_back(input);
}
NodePointer totalInput = nullptr;
switch (inputs.size()) {
case 1:
totalInput = inputs.front();
break;
// This covers both none and multiple parameters.
default:
auto tuple = Dem.createNode(Node::Kind::Tuple);
for (auto &input : inputs)
tuple->addChild(input, Dem);
totalInput = tuple;
break;
}
NodePointer args = Dem.createNode(Node::Kind::ArgumentTuple);
args->addChild(totalInput, Dem);
NodePointer resultTy = _swift_buildDemanglingForMetadata(func->ResultType,
Dem);
NodePointer result = Dem.createNode(Node::Kind::ReturnType);
result->addChild(resultTy, Dem);
auto funcNode = Dem.createNode(kind);
if (func->throws())
funcNode->addChild(Dem.createNode(Node::Kind::ThrowsAnnotation), Dem);
funcNode->addChild(args, Dem);
funcNode->addChild(result, Dem);
return funcNode;
}
case MetadataKind::Metatype: {
auto metatype = static_cast<const MetatypeMetadata *>(type);
auto instance = _swift_buildDemanglingForMetadata(metatype->InstanceType,
Dem);
auto typeNode = Dem.createNode(Node::Kind::Type);
typeNode->addChild(instance, Dem);
auto node = Dem.createNode(Node::Kind::Metatype);
node->addChild(typeNode, Dem);
return node;
}
case MetadataKind::Tuple: {
auto tuple = static_cast<const TupleTypeMetadata *>(type);
const char *labels = tuple->Labels;
auto tupleNode = Dem.createNode(Node::Kind::Tuple);
for (unsigned i = 0, e = tuple->NumElements; i < e; ++i) {
auto elt = Dem.createNode(Node::Kind::TupleElement);
// Add a label child if applicable:
if (labels) {
// Look for the next space in the labels string.
if (const char *space = strchr(labels, ' ')) {
// If there is one, and the label isn't empty, add a label child.
if (labels != space) {
auto eltName =
Dem.createNode(Node::Kind::TupleElementName,
llvm::StringRef(labels, space - labels));
elt->addChild(eltName, Dem);
}
// Skip past the space.
labels = space + 1;
}
}
// Add the element type child.
auto eltType =
_swift_buildDemanglingForMetadata(tuple->getElement(i).Type, Dem);
elt->addChild(eltType, Dem);
// Add the completed element to the tuple.
tupleNode->addChild(elt, Dem);
}
return tupleNode;
}
case MetadataKind::Opaque:
// FIXME: Some opaque types do have manglings, but we don't have enough info
// to figure them out.
case MetadataKind::HeapLocalVariable:
case MetadataKind::HeapGenericLocalVariable:
case MetadataKind::ErrorObject:
break;
}
// Not a type.
return nullptr;
}
void swift::gatherWrittenGenericArgs(
const Metadata *metadata,
const TypeContextDescriptor *description,
std::vector<const Metadata *> &allGenericArgs) {
auto generics = description->getGenericContext();
if (!generics)
return;
bool missingWrittenArguments = false;
auto genericArgs = description->getGenericArguments(metadata);
for (auto param : generics->getGenericParams()) {
switch (param.getKind()) {
case GenericParamKind::Type:
// The type should have a key argument unless it's been same-typed to
// another type.
if (param.hasKeyArgument()) {
auto genericArg = *genericArgs++;
allGenericArgs.push_back(genericArg);
} else {
// Leave a gap for us to fill in by looking at same type info.
allGenericArgs.push_back(nullptr);
missingWrittenArguments = true;
}
// We don't know about type parameters with extra arguments. Leave
// a hole for it.
if (param.hasExtraArgument()) {
allGenericArgs.push_back(nullptr);
++genericArgs;
}
break;
default:
// We don't know about this kind of parameter. Create placeholders where
// needed.
if (param.hasKeyArgument()) {
allGenericArgs.push_back(nullptr);
++genericArgs;
}
if (param.hasExtraArgument()) {
allGenericArgs.push_back(nullptr);
++genericArgs;
}
break;
}
}
// If there is no follow-up work to do, we're done.
if (!missingWrittenArguments)
return;
// We have generic arguments that would be written, but have been
// canonicalized away. Use same-type requirements to reconstitute them.
// Retrieve the mapping information needed for depth/index -> flat index.
std::vector<unsigned> genericParamCounts;
(void)_gatherGenericParameterCounts(description, genericParamCounts);
// Walk through the generic requirements to evaluate same-type
// constraints that are needed to fill in missing generic arguments.
for (const auto &req : generics->getGenericRequirements()) {
// We only care about same-type constraints.
if (req.Flags.getKind() != GenericRequirementKind::SameType)
continue;
// Where the left-hand side is a generic parameter.
if (req.Param.begin() != req.Param.end())
continue;
// If we don't yet have an argument for this parameter, it's a
// same-type-to-concrete constraint.
unsigned lhsFlatIndex = req.Param.getRootParamIndex();
if (lhsFlatIndex >= allGenericArgs.size())
continue;
if (!allGenericArgs[lhsFlatIndex]) {
// Substitute into the right-hand side.
SubstGenericParametersFromWrittenArgs substitutions(allGenericArgs,
genericParamCounts);
allGenericArgs[lhsFlatIndex] =
_getTypeByMangledName(req.getMangledTypeName(), substitutions);
continue;
}
// If we do have an argument for this parameter, it might be that
// the right-hand side is itself a generic parameter, which means
// we have a same-type constraint A == B where A is already filled in.
Demangler demangler;
NodePointer node = demangler.demangleType(req.getMangledTypeName());
if (!node)
continue;
// Find the flat index that the right-hand side refers to.
if (node->getKind() == Demangle::Node::Kind::Type)
node = node->getChild(0);
if (node->getKind() != Demangle::Node::Kind::DependentGenericParamType)
continue;
auto rhsFlatIndex =
_depthIndexToFlatIndex(node->getChild(0)->getIndex(),
node->getChild(1)->getIndex(),
genericParamCounts);
if (!rhsFlatIndex || *rhsFlatIndex >= allGenericArgs.size())
continue;
if (allGenericArgs[*rhsFlatIndex] || !allGenericArgs[lhsFlatIndex])
continue;
allGenericArgs[*rhsFlatIndex] = allGenericArgs[lhsFlatIndex];
}
}
NodePointer Demangle::stripGenericArgsFromContextNode(NodePointer node,
NodeFactory &factory) {
switch (node->getKind()) {
case Demangle::Node::Kind::BoundGenericClass:
case Demangle::Node::Kind::BoundGenericEnum:
case Demangle::Node::Kind::BoundGenericStructure:
case Demangle::Node::Kind::BoundGenericOtherNominalType:
// Bound generic types have a 'Type' node under them, whose child is
// the non-generic reference. If we don't see that structure, do nothing.
if (node->getNumChildren() < 2 ||
node->getChild(0)->getKind() != Demangle::Node::Kind::Type ||
node->getChild(0)->getNumChildren() < 1)
return node;
// Strip generic arguments from that child, then return it.
return stripGenericArgsFromContextNode(node->getChild(0)->getChild(0),
factory);
case Demangle::Node::Kind::Class:
case Demangle::Node::Kind::Enum:
case Demangle::Node::Kind::Structure:
case Demangle::Node::Kind::OtherNominalType: {
if (node->getNumChildren() < 2)
return node;
auto newContext = stripGenericArgsFromContextNode(node->getChild(0),
factory);
if (newContext == node->getChild(0)) return node;
auto newNode = factory.createNode(node->getKind());
newNode->addChild(newContext, factory);
for (unsigned i = 1, n = node->getNumChildren(); i != n; ++i)
newNode->addChild(node->getChild(i), factory);
return newNode;
}
case Demangle::Node::Kind::Extension: {
// Strip generic arguments from the extended type.
if (node->getNumChildren() < 2)
return node;
auto newExtended = stripGenericArgsFromContextNode(node->getChild(1),
factory);
if (newExtended == node->getChild(1)) return node;
auto newNode = factory.createNode(Node::Kind::Extension);
newNode->addChild(node->getChild(0), factory);
newNode->addChild(newExtended, factory);
if (node->getNumChildren() == 3)
newNode->addChild(node->getChild(2), factory);
return newNode;
}
case Demangle::Node::Kind::Module:
// Modules terminate the recursion.
return node;
default:
// FIXME: Handle local contexts.
return node;
}
}
