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swift-mirror/lib/Serialization/Deserialization.cpp
Jordan Rose f1902fd719 [Serialization] Drop typealiases whose underlying types have changed. (#8896) 
In order to accomplish this, cross-module references to typealiases
are now banned except from within conformances and NameAliasTypes, the
latter of which records the canonical type to determine if the
typealias has changed. For conformances, we don't have a good way to
check if the typealias has changed without trying to map it into
context, but that's all right---the rest of the compiler can already
fall back to the canonical type.
2017-04-21 13:17:12 -07:00

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//===--- Deserialization.cpp - Loading a serialized AST -------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/Serialization/ModuleFile.h"
#include "swift/Serialization/ModuleFormat.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/Initializer.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/Parse/Parser.h"
#include "swift/Serialization/BCReadingExtras.h"
#include "swift/Serialization/SerializedModuleLoader.h"
#include "swift/Basic/Defer.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/raw_ostream.h"
#define DEBUG_TYPE "Serialization"
STATISTIC(NumDeclsLoaded, "# of decls deserialized");
STATISTIC(NumMemberListsLoaded,
"# of nominals/extensions whose members were loaded");
STATISTIC(NumNestedTypeShortcuts,
"# of same-module nested types resolved without lookup");
using namespace swift;
using namespace swift::serialization;
using llvm::Expected;
StringRef swift::getNameOfModule(const ModuleFile *MF) {
return MF->Name;
}
namespace {
struct IDAndKind {
const Decl *D;
DeclID ID;
};
static raw_ostream &operator<<(raw_ostream &os, IDAndKind &&pair) {
return os << Decl::getKindName(pair.D->getKind())
<< "Decl #" << pair.ID;
}
class PrettyDeclDeserialization : public llvm::PrettyStackTraceEntry {
const ModuleFile *MF;
const ModuleFile::Serialized<Decl*> &DeclOrOffset;
DeclID ID;
decls_block::RecordKind Kind;
public:
PrettyDeclDeserialization(ModuleFile *module,
const ModuleFile::Serialized<Decl*> &declOrOffset,
DeclID DID, decls_block::RecordKind kind)
: MF(module), DeclOrOffset(declOrOffset), ID(DID), Kind(kind) {
}
static const char *getRecordKindString(decls_block::RecordKind Kind) {
switch (Kind) {
#define RECORD(Id) case decls_block::Id: return #Id;
#include "swift/Serialization/DeclTypeRecordNodes.def"
}
llvm_unreachable("Unhandled RecordKind in switch.");
}
void print(raw_ostream &os) const override {
if (!DeclOrOffset.isComplete()) {
os << "While deserializing decl #" << ID << " ("
<< getRecordKindString(Kind) << ")";
} else {
os << "While deserializing ";
if (auto VD = dyn_cast<ValueDecl>(DeclOrOffset.get())) {
os << "'" << VD->getName() << "' (" << IDAndKind{VD, ID} << ")";
} else if (auto ED = dyn_cast<ExtensionDecl>(DeclOrOffset.get())) {
os << "extension of '" << ED->getExtendedType() << "' ("
<< IDAndKind{ED, ID} << ")";
} else {
os << IDAndKind{DeclOrOffset.get(), ID};
}
}
os << " in '" << getNameOfModule(MF) << "'\n";
}
};
class XRefTracePath {
class PathPiece {
public:
enum class Kind {
Value,
Type,
Operator,
OperatorFilter,
Accessor,
Extension,
GenericParam,
Unknown
};
private:
Kind kind;
void *data;
template <typename T>
T getDataAs() const {
return llvm::PointerLikeTypeTraits<T>::getFromVoidPointer(data);
}
public:
template <typename T>
PathPiece(Kind K, T value)
: kind(K),
data(llvm::PointerLikeTypeTraits<T>::getAsVoidPointer(value)) {}
void print(raw_ostream &os) const {
switch (kind) {
case Kind::Value:
os << getDataAs<Identifier>();
break;
case Kind::Type:
os << "with type " << getDataAs<Type>();
break;
case Kind::Extension:
if (getDataAs<ModuleDecl *>())
os << "in an extension in module '" << getDataAs<ModuleDecl *>()->getName()
<< "'";
else
os << "in an extension in any module";
break;
case Kind::Operator:
os << "operator " << getDataAs<Identifier>();
break;
case Kind::OperatorFilter:
switch (getDataAs<uintptr_t>()) {
case Infix:
os << "(infix)";
break;
case Prefix:
os << "(prefix)";
break;
case Postfix:
os << "(postfix)";
break;
default:
os << "(unknown operator filter)";
break;
}
break;
case Kind::Accessor:
switch (getDataAs<uintptr_t>()) {
case Getter:
os << "(getter)";
break;
case Setter:
os << "(setter)";
break;
case MaterializeForSet:
os << "(materializeForSet)";
break;
case Addressor:
os << "(addressor)";
break;
case MutableAddressor:
os << "(mutableAddressor)";
break;
case WillSet:
os << "(willSet)";
break;
case DidSet:
os << "(didSet)";
break;
default:
os << "(unknown accessor kind)";
break;
}
break;
case Kind::GenericParam:
os << "generic param #" << getDataAs<uintptr_t>();
break;
case Kind::Unknown:
os << "unknown xref kind " << getDataAs<uintptr_t>();
break;
}
}
};
ModuleDecl &baseM;
SmallVector<PathPiece, 8> path;
public:
explicit XRefTracePath(ModuleDecl &M) : baseM(M) {}
void addValue(Identifier name) {
path.push_back({ PathPiece::Kind::Value, name });
}
void addType(Type ty) {
path.push_back({ PathPiece::Kind::Type, ty });
}
void addOperator(Identifier name) {
path.push_back({ PathPiece::Kind::Operator, name });
}
void addOperatorFilter(uint8_t fixity) {
path.push_back({ PathPiece::Kind::OperatorFilter,
static_cast<uintptr_t>(fixity) });
}
void addAccessor(uint8_t kind) {
path.push_back({ PathPiece::Kind::Accessor,
static_cast<uintptr_t>(kind) });
}
void addExtension(ModuleDecl *M) {
path.push_back({ PathPiece::Kind::Extension, M });
}
void addGenericParam(uintptr_t index) {
path.push_back({ PathPiece::Kind::GenericParam, index });
}
void addUnknown(uintptr_t kind) {
path.push_back({ PathPiece::Kind::Unknown, kind });
}
void removeLast() {
path.pop_back();
}
void print(raw_ostream &os, StringRef leading = "") const {
os << "Cross-reference to module '" << baseM.getName() << "'\n";
for (auto &piece : path) {
os << leading << "... ";
piece.print(os);
os << "\n";
}
}
};
class PrettyXRefTrace :
public llvm::PrettyStackTraceEntry,
public XRefTracePath {
public:
explicit PrettyXRefTrace(ModuleDecl &M) : XRefTracePath(M) {}
void print(raw_ostream &os) const override {
XRefTracePath::print(os, "\t");
}
};
class PrettyStackTraceModuleFile : public llvm::PrettyStackTraceEntry {
const char *Action;
const ModuleFile *MF;
public:
explicit PrettyStackTraceModuleFile(const char *action, ModuleFile *module)
: Action(action), MF(module) {}
void print(raw_ostream &os) const override {
os << Action << " \'" << getNameOfModule(MF) << "'\n";
}
};
class XRefError : public llvm::ErrorInfo<XRefError> {
friend ErrorInfo;
static const char ID;
XRefTracePath path;
const char *message;
public:
template <size_t N>
XRefError(const char (&message)[N], XRefTracePath path)
: path(path), message(message) {}
void log(raw_ostream &OS) const override {
OS << message << "\n";
path.print(OS);
}
std::error_code convertToErrorCode() const override {
// This is a deprecated part of llvm::Error, so we just return a very
// generic value.
return {EINVAL, std::generic_category()};
}
};
const char XRefError::ID = '\0';
class OverrideError : public llvm::ErrorInfo<OverrideError> {
friend ErrorInfo;
static const char ID;
DeclName name;
public:
explicit OverrideError(DeclName name) : name(name) {}
void log(raw_ostream &OS) const override {
OS << "could not find '" << name << "' in parent class";
}
std::error_code convertToErrorCode() const override {
// This is a deprecated part of llvm::Error, so we just return a very
// generic value.
return {EINVAL, std::generic_category()};
}
};
const char OverrideError::ID = '\0';
} // end anonymous namespace
/// Skips a single record in the bitstream.
///
/// Returns true if the next entry is a record of type \p recordKind.
/// Destroys the stream position if the next entry is not a record.
static void skipRecord(llvm::BitstreamCursor &cursor, unsigned recordKind) {
auto next = cursor.advance(AF_DontPopBlockAtEnd);
assert(next.Kind == llvm::BitstreamEntry::Record);
#if NDEBUG
cursor.skipRecord(next.ID);
#else
SmallVector<uint64_t, 64> scratch;
StringRef blobData;
unsigned kind = cursor.readRecord(next.ID, scratch, &blobData);
assert(kind == recordKind);
#endif
}
void ModuleFile::fatal(llvm::Error error) {
if (FileContext) {
getContext().Diags.diagnose(SourceLoc(), diag::serialization_fatal, Name);
if (!CompatibilityVersion.empty()) {
SmallString<16> buffer;
llvm::raw_svector_ostream out(buffer);
out << getContext().LangOpts.EffectiveLanguageVersion;
if (out.str() != CompatibilityVersion) {
getContext().Diags.diagnose(
SourceLoc(), diag::serialization_compatibility_version_mismatch,
out.str(), Name, CompatibilityVersion);
}
}
}
logAllUnhandledErrors(std::move(error), llvm::errs(),
"\n*** DESERIALIZATION FAILURE (please include this "
"section in any bug report) ***\n");
abort();
}
ModuleFile &ModuleFile::getModuleFileForDelayedActions() {
assert(FileContext && "cannot delay actions before associating with a file");
ModuleDecl *associatedModule = getAssociatedModule();
// Check for the common case.
if (associatedModule->getFiles().size() == 1)
return *this;
for (FileUnit *file : associatedModule->getFiles())
if (auto *serialized = dyn_cast<SerializedASTFile>(file))
return serialized->File;
llvm_unreachable("should always have FileContext in the list of files");
}
void ModuleFile::finishPendingActions() {
assert(&getModuleFileForDelayedActions() == this &&
"wrong module used for delayed actions");
while (!DelayedGenericEnvironments.empty()) {
// Force completion of the last generic environment.
auto genericEnvDC = DelayedGenericEnvironments.back();
DelayedGenericEnvironments.pop_back();
(void)genericEnvDC->getGenericEnvironmentOfContext();
}
}
/// Translate from the serialization DefaultArgumentKind enumerators, which are
/// guaranteed to be stable, to the AST ones.
static Optional<swift::DefaultArgumentKind>
getActualDefaultArgKind(uint8_t raw) {
switch (static_cast<serialization::DefaultArgumentKind>(raw)) {
case serialization::DefaultArgumentKind::None:
return swift::DefaultArgumentKind::None;
case serialization::DefaultArgumentKind::Normal:
return swift::DefaultArgumentKind::Normal;
case serialization::DefaultArgumentKind::Inherited:
return swift::DefaultArgumentKind::Inherited;
case serialization::DefaultArgumentKind::Column:
return swift::DefaultArgumentKind::Column;
case serialization::DefaultArgumentKind::File:
return swift::DefaultArgumentKind::File;
case serialization::DefaultArgumentKind::Line:
return swift::DefaultArgumentKind::Line;
case serialization::DefaultArgumentKind::Function:
return swift::DefaultArgumentKind::Function;
case serialization::DefaultArgumentKind::DSOHandle:
return swift::DefaultArgumentKind::DSOHandle;
case serialization::DefaultArgumentKind::Nil:
return swift::DefaultArgumentKind::Nil;
case serialization::DefaultArgumentKind::EmptyArray:
return swift::DefaultArgumentKind::EmptyArray;
case serialization::DefaultArgumentKind::EmptyDictionary:
return swift::DefaultArgumentKind::EmptyDictionary;
}
return None;
}
ParameterList *ModuleFile::readParameterList() {
using namespace decls_block;
SmallVector<uint64_t, 8> scratch;
auto entry = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch);
assert(recordID == PARAMETERLIST);
(void) recordID;
unsigned numParams;
decls_block::ParameterListLayout::readRecord(scratch, numParams);
SmallVector<ParamDecl*, 8> params;
for (unsigned i = 0; i != numParams; ++i) {
scratch.clear();
auto entry = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch);
assert(recordID == PARAMETERLIST_ELT);
(void) recordID;
DeclID paramID;
bool isVariadic;
uint8_t rawDefaultArg;
decls_block::ParameterListEltLayout::readRecord(scratch, paramID,
isVariadic, rawDefaultArg);
auto decl = cast<ParamDecl>(getDecl(paramID));
decl->setVariadic(isVariadic);
// Decode the default argument kind.
// FIXME: Default argument expression, if available.
if (auto defaultArg = getActualDefaultArgKind(rawDefaultArg))
decl->setDefaultArgumentKind(*defaultArg);
params.push_back(decl);
}
return ParameterList::create(getContext(), params);
}
Expected<Pattern *> ModuleFile::readPattern(DeclContext *owningDC) {
// Currently, the only case in which this function can fail (return an error)
// is when reading a pattern for a single variable declaration.
using namespace decls_block;
auto readPatternUnchecked = [this](DeclContext *owningDC) -> Pattern * {
Expected<Pattern *> deserialized = readPattern(owningDC);
if (!deserialized) {
fatal(deserialized.takeError());
}
assert(deserialized.get());
return deserialized.get();
};
SmallVector<uint64_t, 8> scratch;
BCOffsetRAII restoreOffset(DeclTypeCursor);
auto next = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
if (next.Kind != llvm::BitstreamEntry::Record) {
error();
return nullptr;
}
/// Local function to record the type of this pattern.
auto recordPatternType = [&](Pattern *pattern, Type type) {
if (type->hasTypeParameter())
pattern->setDelayedInterfaceType(type, owningDC);
else
pattern->setType(type);
};
unsigned kind = DeclTypeCursor.readRecord(next.ID, scratch);
switch (kind) {
case decls_block::PAREN_PATTERN: {
bool isImplicit;
ParenPatternLayout::readRecord(scratch, isImplicit);
Pattern *subPattern = readPatternUnchecked(owningDC);
auto result = new (getContext()) ParenPattern(SourceLoc(),
subPattern,
SourceLoc(),
isImplicit);
if (Type interfaceType = subPattern->getDelayedInterfaceType())
result->setDelayedInterfaceType(ParenType::get(getContext(),
interfaceType), owningDC);
else
result->setType(ParenType::get(getContext(), subPattern->getType()));
restoreOffset.reset();
return result;
}
case decls_block::TUPLE_PATTERN: {
TypeID tupleTypeID;
unsigned count;
bool isImplicit;
TuplePatternLayout::readRecord(scratch, tupleTypeID, count, isImplicit);
SmallVector<TuplePatternElt, 8> elements;
for ( ; count > 0; --count) {
scratch.clear();
next = DeclTypeCursor.advance();
assert(next.Kind == llvm::BitstreamEntry::Record);
kind = DeclTypeCursor.readRecord(next.ID, scratch);
assert(kind == decls_block::TUPLE_PATTERN_ELT);
// FIXME: Add something for this record or remove it.
IdentifierID labelID;
TuplePatternEltLayout::readRecord(scratch, labelID);
Identifier label = getIdentifier(labelID);
Pattern *subPattern = readPatternUnchecked(owningDC);
elements.push_back(TuplePatternElt(label, SourceLoc(), subPattern));
}
auto result = TuplePattern::create(getContext(), SourceLoc(),
elements, SourceLoc(), isImplicit);
recordPatternType(result, getType(tupleTypeID));
restoreOffset.reset();
return result;
}
case decls_block::NAMED_PATTERN: {
DeclID varID;
TypeID typeID;
bool isImplicit;
NamedPatternLayout::readRecord(scratch, varID, typeID, isImplicit);
auto deserialized = getDeclChecked(varID);
if (!deserialized) {
// Pass through the error. It's too bad that it affects the whole pattern,
// but that's what we get.
return deserialized.takeError();
}
auto var = cast<VarDecl>(deserialized.get());
auto result = new (getContext()) NamedPattern(var, isImplicit);
recordPatternType(result, getType(typeID));
restoreOffset.reset();
return result;
}
case decls_block::ANY_PATTERN: {
TypeID typeID;
bool isImplicit;
AnyPatternLayout::readRecord(scratch, typeID, isImplicit);
auto result = new (getContext()) AnyPattern(SourceLoc(), isImplicit);
recordPatternType(result, getType(typeID));
restoreOffset.reset();
return result;
}
case decls_block::TYPED_PATTERN: {
TypeID typeID;
bool isImplicit;
TypedPatternLayout::readRecord(scratch, typeID, isImplicit);
Expected<Pattern *> subPattern = readPattern(owningDC);
if (!subPattern) {
// Pass through any errors.
return subPattern;
}
auto result = new (getContext()) TypedPattern(subPattern.get(), TypeLoc(),
isImplicit);
recordPatternType(result, getType(typeID));
restoreOffset.reset();
return result;
}
case decls_block::VAR_PATTERN: {
bool isImplicit, isLet;
VarPatternLayout::readRecord(scratch, isLet, isImplicit);
Pattern *subPattern = readPatternUnchecked(owningDC);
auto result = new (getContext()) VarPattern(SourceLoc(), isLet, subPattern,
isImplicit);
if (Type interfaceType = subPattern->getDelayedInterfaceType())
result->setDelayedInterfaceType(interfaceType, owningDC);
else
result->setType(subPattern->getType());
restoreOffset.reset();
return result;
}
default:
return nullptr;
}
}
SILLayout *ModuleFile::readSILLayout(llvm::BitstreamCursor &Cursor) {
using namespace decls_block;
SmallVector<uint64_t, 16> scratch;
auto next = Cursor.advance(AF_DontPopBlockAtEnd);
assert(next.Kind == llvm::BitstreamEntry::Record);
unsigned kind = Cursor.readRecord(next.ID, scratch);
switch (kind) {
case decls_block::SIL_LAYOUT: {
unsigned numFields;
ArrayRef<uint64_t> types;
decls_block::SILLayoutLayout::readRecord(scratch, numFields, types);
SmallVector<SILField, 4> fields;
for (auto fieldInfo : types.slice(0, numFields)) {
bool isMutable = fieldInfo & 0x80000000U;
auto typeId = fieldInfo & 0x7FFFFFFFU;
fields.push_back(
SILField(getType(typeId)->getCanonicalType(),
isMutable));
}
SmallVector<GenericTypeParamType*, 4> genericParams;
for (auto typeId : types.slice(numFields)) {
auto type = getType(typeId)->castTo<GenericTypeParamType>();
genericParams.push_back(type);
}
SmallVector<Requirement, 4> requirements;
readGenericRequirements(requirements, DeclTypeCursor);
CanGenericSignature sig;
if (!genericParams.empty() || !requirements.empty()) {
sig = GenericSignature::get(genericParams, requirements)
->getCanonicalSignature();
}
return SILLayout::get(getContext(), sig, fields);
}
default:
error();
return nullptr;
}
}
ProtocolConformanceRef ModuleFile::readConformance(
llvm::BitstreamCursor &Cursor,
GenericEnvironment *genericEnv) {
using namespace decls_block;
SmallVector<uint64_t, 16> scratch;
auto next = Cursor.advance(AF_DontPopBlockAtEnd);
assert(next.Kind == llvm::BitstreamEntry::Record);
unsigned kind = Cursor.readRecord(next.ID, scratch);
switch (kind) {
case ABSTRACT_PROTOCOL_CONFORMANCE: {
DeclID protoID;
AbstractProtocolConformanceLayout::readRecord(scratch, protoID);
auto proto = cast<ProtocolDecl>(getDecl(protoID));
return ProtocolConformanceRef(proto);
}
case SPECIALIZED_PROTOCOL_CONFORMANCE: {
TypeID conformingTypeID;
unsigned numSubstitutions;
SpecializedProtocolConformanceLayout::readRecord(scratch, conformingTypeID,
numSubstitutions);
ASTContext &ctx = getContext();
Type conformingType = getType(conformingTypeID);
if (genericEnv) {
conformingType = genericEnv->mapTypeIntoContext(conformingType);
}
PrettyStackTraceType trace(getAssociatedModule()->getASTContext(),
"reading specialized conformance for",
conformingType);
// Read the substitutions.
SmallVector<Substitution, 4> substitutions;
while (numSubstitutions--) {
auto sub = maybeReadSubstitution(Cursor, genericEnv);
assert(sub.hasValue() && "Missing substitution?");
substitutions.push_back(*sub);
}
ProtocolConformanceRef genericConformance =
readConformance(Cursor, genericEnv);
PrettyStackTraceDecl traceTo("... to", genericConformance.getRequirement());
assert(genericConformance.isConcrete() && "Abstract generic conformance?");
auto conformance =
ctx.getSpecializedConformance(conformingType,
genericConformance.getConcrete(),
substitutions);
return ProtocolConformanceRef(conformance);
}
case INHERITED_PROTOCOL_CONFORMANCE: {
TypeID conformingTypeID;
InheritedProtocolConformanceLayout::readRecord(scratch, conformingTypeID);
ASTContext &ctx = getContext();
Type conformingType = getType(conformingTypeID);
if (genericEnv) {
conformingType = genericEnv->mapTypeIntoContext(conformingType);
}
PrettyStackTraceType trace(getAssociatedModule()->getASTContext(),
"reading inherited conformance for",
conformingType);
ProtocolConformanceRef inheritedConformance =
readConformance(Cursor, genericEnv);
PrettyStackTraceDecl traceTo("... to",
inheritedConformance.getRequirement());
assert(inheritedConformance.isConcrete() &&
"Abstract inherited conformance?");
auto conformance =
ctx.getInheritedConformance(conformingType,
inheritedConformance.getConcrete());
return ProtocolConformanceRef(conformance);
}
case NORMAL_PROTOCOL_CONFORMANCE_ID: {
NormalConformanceID conformanceID;
NormalProtocolConformanceIdLayout::readRecord(scratch, conformanceID);
return ProtocolConformanceRef(readNormalConformance(conformanceID));
}
case PROTOCOL_CONFORMANCE_XREF: {
DeclID protoID;
DeclID nominalID;
ModuleID moduleID;
ProtocolConformanceXrefLayout::readRecord(scratch, protoID, nominalID,
moduleID);
auto nominal = cast<NominalTypeDecl>(getDecl(nominalID));
PrettyStackTraceDecl trace("cross-referencing conformance for", nominal);
auto proto = cast<ProtocolDecl>(getDecl(protoID));
PrettyStackTraceDecl traceTo("... to", proto);
auto module = getModule(moduleID);
SmallVector<ProtocolConformance *, 2> conformances;
nominal->lookupConformance(module, proto, conformances);
PrettyStackTraceModuleFile traceMsg(
"If you're seeing a crash here, check that your SDK and dependencies "
"are at least as new as the versions used to build", this);
// This would normally be an assertion but it's more useful to print the
// PrettyStackTrace here even in no-asserts builds.
if (conformances.empty())
abort();
return ProtocolConformanceRef(conformances.front());
}
// Not a protocol conformance.
default:
error();
ProtocolConformance *conformance = nullptr;
return ProtocolConformanceRef(conformance); // FIXME: this will assert
}
}
NormalProtocolConformance *ModuleFile::readNormalConformance(
NormalConformanceID conformanceID) {
auto &conformanceEntry = NormalConformances[conformanceID-1];
if (conformanceEntry.isComplete()) {
return conformanceEntry.get();
}
using namespace decls_block;
// Find the conformance record.
BCOffsetRAII restoreOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(conformanceEntry);
auto entry = DeclTypeCursor.advance();
if (entry.Kind != llvm::BitstreamEntry::Record) {
error();
return nullptr;
}
DeclID protoID;
DeclContextID contextID;
unsigned valueCount, typeCount;
ArrayRef<uint64_t> rawIDs;
SmallVector<uint64_t, 16> scratch;
unsigned kind = DeclTypeCursor.readRecord(entry.ID, scratch);
if (kind != NORMAL_PROTOCOL_CONFORMANCE) {
error();
return nullptr;
}
NormalProtocolConformanceLayout::readRecord(scratch, protoID,
contextID, valueCount,
typeCount,
rawIDs);
ASTContext &ctx = getContext();
DeclContext *dc = getDeclContext(contextID);
Type conformingType = dc->getDeclaredTypeInContext();
PrettyStackTraceType trace(ctx, "reading conformance for", conformingType);
auto proto = cast<ProtocolDecl>(getDecl(protoID));
PrettyStackTraceDecl traceTo("... to", proto);
auto conformance = ctx.getConformance(conformingType, proto, SourceLoc(), dc,
ProtocolConformanceState::Incomplete);
// Record this conformance.
if (conformanceEntry.isComplete())
return conformance;
uint64_t offset = conformanceEntry;
conformanceEntry = conformance;
dc->getAsNominalTypeOrNominalTypeExtensionContext()
->registerProtocolConformance(conformance);
// Read requirement signature conformances.
SmallVector<ProtocolConformanceRef, 4> reqConformances;
for (auto req : proto->getRequirementSignature()->getRequirements()) {
if (req.getKind() == RequirementKind::Conformance) {
auto reqConformance = readConformance(DeclTypeCursor);
reqConformances.push_back(reqConformance);
}
}
conformance->setSignatureConformances(reqConformances);
// If the conformance is complete, we're done.
if (conformance->isComplete())
return conformance;
conformance->setState(ProtocolConformanceState::Complete);
conformance->setLazyLoader(this, offset);
return conformance;
}
Optional<Substitution>
ModuleFile::maybeReadSubstitution(llvm::BitstreamCursor &cursor,
GenericEnvironment *genericEnv) {
BCOffsetRAII lastRecordOffset(cursor);
auto entry = cursor.advance(AF_DontPopBlockAtEnd);
if (entry.Kind != llvm::BitstreamEntry::Record)
return None;
StringRef blobData;
SmallVector<uint64_t, 2> scratch;
unsigned recordID = cursor.readRecord(entry.ID, scratch, &blobData);
if (recordID != decls_block::BOUND_GENERIC_SUBSTITUTION)
return None;
TypeID replacementID;
unsigned numConformances;
decls_block::BoundGenericSubstitutionLayout::readRecord(scratch,
replacementID,
numConformances);
auto replacementTy = getType(replacementID);
if (genericEnv) {
replacementTy = genericEnv->mapTypeIntoContext(replacementTy);
}
SmallVector<ProtocolConformanceRef, 4> conformanceBuf;
while (numConformances--) {
conformanceBuf.push_back(readConformance(cursor));
}
lastRecordOffset.reset();
return Substitution{replacementTy,
getContext().AllocateCopy(conformanceBuf)};
}
GenericParamList *ModuleFile::maybeReadGenericParams(DeclContext *DC,
GenericParamList *outerParams) {
using namespace decls_block;
assert(DC && "need a context for the decls in the list");
BCOffsetRAII lastRecordOffset(DeclTypeCursor);
SmallVector<uint64_t, 8> scratch;
StringRef blobData;
auto next = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
if (next.Kind != llvm::BitstreamEntry::Record)
return nullptr;
unsigned kind = DeclTypeCursor.readRecord(next.ID, scratch, &blobData);
if (kind != GENERIC_PARAM_LIST)
return nullptr;
SmallVector<GenericTypeParamDecl *, 8> params;
while (true) {
lastRecordOffset.reset();
bool shouldContinue = true;
auto entry = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
if (entry.Kind != llvm::BitstreamEntry::Record)
break;
scratch.clear();
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch,
&blobData);
switch (recordID) {
case GENERIC_PARAM: {
DeclID paramDeclID;
GenericParamLayout::readRecord(scratch, paramDeclID);
auto genericParam = cast<GenericTypeParamDecl>(getDecl(paramDeclID, DC));
// FIXME: There are unfortunate inconsistencies in the treatment of
// generic param decls. Currently the first request for context wins
// because we don't want to change context on-the-fly.
// Here are typical scenarios:
// (1) AST reads decl, get's scope.
// Later, readSILFunction tries to force module scope.
// (2) readSILFunction forces module scope.
// Later, readVTable requests an enclosing scope.
// ...other combinations are possible, but as long as AST lookups
// precede SIL linkage, we should be ok.
assert((genericParam->getDeclContext()->isModuleScopeContext() ||
DC->isModuleScopeContext() ||
genericParam->getDeclContext() == DC) &&
"Mismatched decl context for generic types.");
params.push_back(genericParam);
break;
}
default:
// This record is not part of the GenericParamList.
shouldContinue = false;
break;
}
if (!shouldContinue)
break;
}
auto paramList = GenericParamList::create(getContext(), SourceLoc(),
params, SourceLoc(), { },
SourceLoc());
paramList->setOuterParameters(outerParams ? outerParams :
DC->getGenericParamsOfContext());
return paramList;
}
void ModuleFile::readGenericRequirements(
SmallVectorImpl<Requirement> &requirements,
llvm::BitstreamCursor &Cursor) {
using namespace decls_block;
BCOffsetRAII lastRecordOffset(Cursor);
SmallVector<uint64_t, 8> scratch;
StringRef blobData;
while (true) {
lastRecordOffset.reset();
bool shouldContinue = true;
auto entry = Cursor.advance(AF_DontPopBlockAtEnd);
if (entry.Kind != llvm::BitstreamEntry::Record)
break;
scratch.clear();
unsigned recordID = Cursor.readRecord(entry.ID, scratch, &blobData);
switch (recordID) {
case GENERIC_REQUIREMENT: {
uint8_t rawKind;
uint64_t rawTypeIDs[2];
GenericRequirementLayout::readRecord(scratch, rawKind,
rawTypeIDs[0], rawTypeIDs[1]);
switch (rawKind) {
case GenericRequirementKind::Conformance: {
auto subject = getType(rawTypeIDs[0]);
auto constraint = getType(rawTypeIDs[1]);
requirements.push_back(Requirement(RequirementKind::Conformance,
subject, constraint));
break;
}
case GenericRequirementKind::Superclass: {
auto subject = getType(rawTypeIDs[0]);
auto constraint = getType(rawTypeIDs[1]);
requirements.push_back(Requirement(RequirementKind::Superclass,
subject, constraint));
break;
}
case GenericRequirementKind::SameType: {
auto first = getType(rawTypeIDs[0]);
auto second = getType(rawTypeIDs[1]);
requirements.push_back(Requirement(RequirementKind::SameType,
first, second));
break;
}
default:
// Unknown requirement kind. Drop the requirement and continue, but log
// an error so that we don't actually try to generate code.
error();
}
break;
}
case LAYOUT_REQUIREMENT: {
uint8_t rawKind;
uint64_t rawTypeID;
uint32_t size;
uint32_t alignment;
LayoutRequirementLayout::readRecord(scratch, rawKind, rawTypeID,
size, alignment);
auto first = getType(rawTypeID);
LayoutConstraint layout;
LayoutConstraintKind kind = LayoutConstraintKind::UnknownLayout;
switch (rawKind) {
default: {
// Unknown layout requirement kind.
error();
break;
}
case LayoutRequirementKind::NativeRefCountedObject:
kind = LayoutConstraintKind::NativeRefCountedObject;
break;
case LayoutRequirementKind::RefCountedObject:
kind = LayoutConstraintKind::RefCountedObject;
break;
case LayoutRequirementKind::Trivial:
kind = LayoutConstraintKind::Trivial;
break;
case LayoutRequirementKind::TrivialOfExactSize:
kind = LayoutConstraintKind::TrivialOfExactSize;
break;
case LayoutRequirementKind::TrivialOfAtMostSize:
kind = LayoutConstraintKind::TrivialOfAtMostSize;
break;
case LayoutRequirementKind::Class:
kind = LayoutConstraintKind::Class;
break;
case LayoutRequirementKind::NativeClass:
kind = LayoutConstraintKind::NativeClass;
break;
case LayoutRequirementKind::UnknownLayout:
kind = LayoutConstraintKind::UnknownLayout;
break;
}
ASTContext &ctx = getContext();
if (kind != LayoutConstraintKind::TrivialOfAtMostSize &&
kind != LayoutConstraintKind::TrivialOfExactSize)
layout = LayoutConstraint::getLayoutConstraint(kind, ctx);
else
layout =
LayoutConstraint::getLayoutConstraint(kind, size, alignment, ctx);
requirements.push_back(
Requirement(RequirementKind::Layout, first, layout));
break;
}
default:
// This record is not part of the GenericParamList.
shouldContinue = false;
break;
}
if (!shouldContinue)
break;
}
}
void ModuleFile::configureGenericEnvironment(
GenericContext *genericDecl,
serialization::GenericEnvironmentID envID) {
if (envID == 0) return;
auto sigOrEnv = getGenericSignatureOrEnvironment(envID);
// If we just have a generic signature, set up lazy generic environment
// creation.
if (auto genericSig = sigOrEnv.dyn_cast<GenericSignature *>()) {
genericDecl->setLazyGenericEnvironment(this, genericSig, envID);
ModuleFile &delayedActionFile = getModuleFileForDelayedActions();
delayedActionFile.DelayedGenericEnvironments.push_back(genericDecl);
return;
}
// If we have a full generic environment, it's because it happened to be
// deserialized already. Record it directly.
if (auto genericEnv = sigOrEnv.dyn_cast<GenericEnvironment *>()) {
genericDecl->setGenericEnvironment(genericEnv);
return;
}
}
llvm::PointerUnion<GenericSignature *, GenericEnvironment *>
ModuleFile::getGenericSignatureOrEnvironment(
serialization::GenericEnvironmentID ID,
bool wantEnvironment) {
// The empty result with the type the caller expects.
llvm::PointerUnion<GenericSignature *, GenericEnvironment *> result;
if (wantEnvironment)
result = static_cast<GenericEnvironment *>(nullptr);
// Zero is a sentinel for having no generic environment.
if (ID == 0) return result;
assert(ID <= GenericEnvironments.size() && "invalid GenericEnvironment ID");
auto &envOrOffset = GenericEnvironments[ID-1];
// If we've already deserialized this generic environment, return it.
if (envOrOffset.isComplete()) {
return envOrOffset.get();
}
// Read the generic environment.
BCOffsetRAII restoreOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(envOrOffset);
DeserializingEntityRAII deserializingEntity(*this);
SmallVector<GenericTypeParamType *, 4> paramTypes;
{
using namespace decls_block;
StringRef blobData;
SmallVector<uint64_t, 8> scratch;
// we only want to be tracking the offset for this part of the function,
// since loading the generic signature (a) may read the record we reject,
// and (b) shouldn't have its progress erased. (That function also does its
// own internal tracking.)
BCOffsetRAII lastRecordOffset(DeclTypeCursor);
auto entry = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
if (entry.Kind != llvm::BitstreamEntry::Record)
return result;
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch, &blobData);
switch (recordID) {
case GENERIC_ENVIRONMENT: {
lastRecordOffset.reset();
ArrayRef<uint64_t> rawParamIDs;
GenericEnvironmentLayout::readRecord(scratch, rawParamIDs);
for (unsigned i = 0, n = rawParamIDs.size(); i != n; ++i) {
auto paramTy = getType(rawParamIDs[i])->castTo<GenericTypeParamType>();
paramTypes.push_back(paramTy);
}
break;
}
case SIL_GENERIC_ENVIRONMENT: {
ArrayRef<uint64_t> rawParamIDs;
SILGenericEnvironmentLayout::readRecord(scratch, rawParamIDs);
lastRecordOffset.reset();
if (rawParamIDs.size() % 2 != 0) {
error();
return result;
}
for (unsigned i = 0, n = rawParamIDs.size(); i != n; i += 2) {
Identifier name = getIdentifier(rawParamIDs[i]);
auto paramTy = getType(rawParamIDs[i+1])->castTo<GenericTypeParamType>();
if (!name.empty()) {
auto paramDecl =
createDecl<GenericTypeParamDecl>(getAssociatedModule(),
name,
SourceLoc(),
paramTy->getDepth(),
paramTy->getIndex());
paramTy = paramDecl->getDeclaredInterfaceType()
->castTo<GenericTypeParamType>();
}
paramTypes.push_back(paramTy);
}
break;
}
default:
error();
return result;
}
}
// If there are no parameters, the environment is empty.
if (paramTypes.empty()) {
if (wantEnvironment)
envOrOffset = nullptr;
return result;
}
// Read the generic requirements.
SmallVector<Requirement, 4> requirements;
readGenericRequirements(requirements, DeclTypeCursor);
// Construct the generic signature from the loaded parameters and
// requirements.
auto signature = GenericSignature::get(paramTypes, requirements);
// If we only want the signature, return it now.
if (!wantEnvironment) return signature;
// If we've already deserialized this generic environment, return it.
if (envOrOffset.isComplete()) {
return envOrOffset.get();
}
// Form the generic environment. Record it now so that deserialization of
// the archetypes in the environment can refer to this environment.
auto genericEnv = signature->createGenericEnvironment(*getAssociatedModule());
envOrOffset = genericEnv;
return genericEnv;
}
GenericEnvironment *ModuleFile::getGenericEnvironment(
serialization::GenericEnvironmentID ID) {
return getGenericSignatureOrEnvironment(ID, /*wantEnvironment=*/true)
.get<GenericEnvironment *>();
;
}
bool ModuleFile::readMembers(SmallVectorImpl<Decl *> &Members) {
using namespace decls_block;
auto entry = DeclTypeCursor.advance();
if (entry.Kind != llvm::BitstreamEntry::Record)
return true;
SmallVector<uint64_t, 16> memberIDBuffer;
unsigned kind = DeclTypeCursor.readRecord(entry.ID, memberIDBuffer);
assert(kind == MEMBERS);
(void)kind;
ArrayRef<uint64_t> rawMemberIDs;
decls_block::MembersLayout::readRecord(memberIDBuffer, rawMemberIDs);
if (rawMemberIDs.empty())
return false;
Members.reserve(rawMemberIDs.size());
for (DeclID rawID : rawMemberIDs) {
Expected<Decl *> D = getDeclChecked(rawID);
if (!D) {
if (!getContext().LangOpts.EnableDeserializationRecovery)
fatal(D.takeError());
// Silently drop the member if it had an override-related problem.
llvm::handleAllErrors(D.takeError(),
[](const OverrideError &) { /* expected */ },
[this](std::unique_ptr<llvm::ErrorInfoBase> unhandled) {
fatal(std::move(unhandled));
});
continue;
}
assert(D.get() && "unchecked error deserializing next member");
Members.push_back(D.get());
}
return false;
}
bool ModuleFile::readDefaultWitnessTable(ProtocolDecl *proto) {
using namespace decls_block;
auto entry = DeclTypeCursor.advance();
if (entry.Kind != llvm::BitstreamEntry::Record)
return true;
SmallVector<uint64_t, 16> witnessIDBuffer;
unsigned kind = DeclTypeCursor.readRecord(entry.ID, witnessIDBuffer);
assert(kind == DEFAULT_WITNESS_TABLE);
(void)kind;
ArrayRef<uint64_t> rawWitnessIDs;
decls_block::DefaultWitnessTableLayout::readRecord(
witnessIDBuffer, rawWitnessIDs);
if (rawWitnessIDs.empty())
return false;
unsigned e = rawWitnessIDs.size();
assert(e % 2 == 0 && "malformed default witness table");
(void) e;
for (unsigned i = 0, e = rawWitnessIDs.size(); i < e; i += 2) {
ValueDecl *requirement = cast<ValueDecl>(getDecl(rawWitnessIDs[i]));
assert(requirement && "unable to deserialize next requirement");
ValueDecl *witness = cast<ValueDecl>(getDecl(rawWitnessIDs[i + 1]));
assert(witness && "unable to deserialize next witness");
assert(requirement->getDeclContext() == proto);
proto->setDefaultWitness(requirement, witness);
}
return false;
}
static Optional<swift::CtorInitializerKind>
getActualCtorInitializerKind(uint8_t raw) {
switch (serialization::CtorInitializerKind(raw)) {
#define CASE(NAME) \
case serialization::CtorInitializerKind::NAME: \
return swift::CtorInitializerKind::NAME;
CASE(Designated)
CASE(Convenience)
CASE(Factory)
CASE(ConvenienceFactory)
#undef CASE
}
return None;
}
/// Remove values from \p values that don't match the expected type or module.
///
/// Any of \p expectedTy, \p expectedModule, or \p expectedGenericSig can be
/// omitted, in which case any type or module is accepted. Values imported
/// from Clang can also appear in any module.
static void filterValues(Type expectedTy, ModuleDecl *expectedModule,
CanGenericSignature expectedGenericSig, bool isType,
bool inProtocolExt, bool isStatic,
Optional<swift::CtorInitializerKind> ctorInit,
SmallVectorImpl<ValueDecl *> &values) {
CanType canTy;
if (expectedTy)
canTy = expectedTy->getCanonicalType();
auto newEnd = std::remove_if(values.begin(), values.end(),
[=](ValueDecl *value) {
if (isType != isa<TypeDecl>(value))
return true;
if (!value->hasInterfaceType())
return true;
if (canTy && value->getInterfaceType()->getCanonicalType() != canTy)
return true;
if (value->isStatic() != isStatic)
return true;
// FIXME: Should be able to move a value from an extension in a derived
// module to the original definition in a base module.
if (expectedModule && !value->hasClangNode() &&
value->getModuleContext() != expectedModule)
return true;
// If we're expecting a member within a constrained extension with a
// particular generic signature, match that signature.
if (expectedGenericSig &&
value->getDeclContext()->getGenericSignatureOfContext()
->getCanonicalSignature() != expectedGenericSig)
return true;
// If we don't expect a specific generic signature, ignore anything from a
// constrained extension.
if (!expectedGenericSig &&
isa<ExtensionDecl>(value->getDeclContext()) &&
cast<ExtensionDecl>(value->getDeclContext())->isConstrainedExtension())
return true;
// If we're looking at members of a protocol or protocol extension,
// filter by whether we expect to find something in a protocol extension or
// not. This lets us distinguish between a protocol member and a protocol
// extension member that have the same type.
if (value->getDeclContext()->getAsProtocolOrProtocolExtensionContext() &&
(bool)value->getDeclContext()->getAsProtocolExtensionContext()
!= inProtocolExt)
return true;
// If we're expecting an initializer with a specific kind, and this is not
// an initializer with that kind, remove it.
if (ctorInit) {
if (!isa<ConstructorDecl>(value) ||
cast<ConstructorDecl>(value)->getInitKind() != *ctorInit)
return true;
}
return false;
});
values.erase(newEnd, values.end());
}
Expected<Decl *>
ModuleFile::resolveCrossReference(ModuleDecl *baseModule, uint32_t pathLen) {
using namespace decls_block;
assert(baseModule && "missing dependency");
PrettyXRefTrace pathTrace(*baseModule);
auto entry = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
if (entry.Kind != llvm::BitstreamEntry::Record) {
error();
return nullptr;
}
SmallVector<ValueDecl *, 8> values;
SmallVector<uint64_t, 8> scratch;
StringRef blobData;
// Read the first path piece. This one is special because lookup is performed
// against the base module, rather than against the previous link in the path.
// In particular, operator path pieces represent actual operators here, but
// filters on operator functions when they appear later on.
scratch.clear();
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch,
&blobData);
switch (recordID) {
case XREF_TYPE_PATH_PIECE:
case XREF_VALUE_PATH_PIECE: {
IdentifierID IID;
TypeID TID = 0;
bool isType = (recordID == XREF_TYPE_PATH_PIECE);
bool inProtocolExt = false;
bool isStatic = false;
if (isType)
XRefTypePathPieceLayout::readRecord(scratch, IID, inProtocolExt);
else
XRefValuePathPieceLayout::readRecord(scratch, TID, IID, inProtocolExt,
isStatic);
Identifier name = getIdentifier(IID);
pathTrace.addValue(name);
Type filterTy = getType(TID);
if (!isType)
pathTrace.addType(filterTy);
bool retrying = false;
retry:
baseModule->lookupQualified(ModuleType::get(baseModule), name,
NL_QualifiedDefault | NL_KnownNoDependency,
/*typeResolver=*/nullptr, values);
filterValues(filterTy, nullptr, nullptr, isType, inProtocolExt, isStatic,
None, values);
// HACK HACK HACK: Omit-needless-words hack to try to cope with
// the "NS" prefix being added/removed. No "real" compiler mode
// has to go through this path, but it's an option we toggle for
// testing.
if (values.empty() && !retrying &&
(baseModule->getName().str() == "ObjectiveC" ||
baseModule->getName().str() == "Foundation")) {
if (name.str().startswith("NS")) {
if (name.str().size() > 2 && name.str() != "NSCocoaError") {
auto known = getKnownFoundationEntity(name.str());
if (!known) {
name = getContext().getIdentifier(name.str().substr(2));
retrying = true;
goto retry;
}
}
} else {
SmallString<16> buffer;
buffer += "NS";
buffer += name.str();
// FIXME: Try uppercasing for non-types.
name = getContext().getIdentifier(buffer);
retrying = true;
goto retry;
}
}
break;
}
case XREF_EXTENSION_PATH_PIECE:
llvm_unreachable("can only extend a nominal");
case XREF_OPERATOR_OR_ACCESSOR_PATH_PIECE: {
IdentifierID IID;
uint8_t rawOpKind;
XRefOperatorOrAccessorPathPieceLayout::readRecord(scratch, IID, rawOpKind);
Identifier opName = getIdentifier(IID);
pathTrace.addOperator(opName);
switch (rawOpKind) {
case OperatorKind::Infix:
return baseModule->lookupInfixOperator(opName);
case OperatorKind::Prefix:
return baseModule->lookupPrefixOperator(opName);
case OperatorKind::Postfix:
return baseModule->lookupPostfixOperator(opName);
case OperatorKind::PrecedenceGroup:
return baseModule->lookupPrecedenceGroup(opName);
default:
// Unknown operator kind.
error();
return nullptr;
}
}
case XREF_GENERIC_PARAM_PATH_PIECE:
case XREF_INITIALIZER_PATH_PIECE:
llvm_unreachable("only in a nominal or function");
default:
// Unknown xref kind.
pathTrace.addUnknown(recordID);
error();
return nullptr;
}
if (values.empty()) {
return llvm::make_error<XRefError>("top-level value not found", pathTrace);
}
// Filters for values discovered in the remaining path pieces.
ModuleDecl *M = nullptr;
CanGenericSignature genericSig = nullptr;
// For remaining path pieces, filter or drill down into the results we have.
while (--pathLen) {
auto entry = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
if (entry.Kind != llvm::BitstreamEntry::Record) {
error();
return nullptr;
}
scratch.clear();
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch,
&blobData);
switch (recordID) {
case XREF_TYPE_PATH_PIECE: {
if (values.size() == 1) {
ModuleDecl *module = values.front()->getModuleContext();
if (module == this->getAssociatedModule()) {
// Fast path for nested types in the same module.
IdentifierID IID;
bool onlyInNominal = false;
XRefTypePathPieceLayout::readRecord(scratch, IID, onlyInNominal);
Identifier memberName = getIdentifier(IID);
pathTrace.addValue(memberName);
llvm::PrettyStackTraceString message{
"If you're seeing a crash here, try passing "
"-Xfrontend -disable-serialization-nested-type-lookup-table"};
TypeDecl *nestedType = nullptr;
if (onlyInNominal) {
// Only look in the file containing the type itself.
const DeclContext *dc = values.front()->getDeclContext();
auto *serializedFile =
dyn_cast<SerializedASTFile>(dc->getModuleScopeContext());
if (serializedFile) {
nestedType =
serializedFile->File.lookupNestedType(memberName,
values.front());
}
} else {
// Fault in extensions, then ask every serialized AST in the module.
(void)cast<NominalTypeDecl>(values.front())->getExtensions();
for (FileUnit *file : module->getFiles()) {
if (file == getFile())
continue;
auto *serializedFile = dyn_cast<SerializedASTFile>(file);
if (!serializedFile)
continue;
nestedType =
serializedFile->File.lookupNestedType(memberName,
values.front());
if (nestedType)
break;
}
}
if (nestedType) {
values.clear();
values.push_back(nestedType);
++NumNestedTypeShortcuts;
break;
}
pathTrace.removeLast();
}
}
LLVM_FALLTHROUGH;
}
case XREF_VALUE_PATH_PIECE:
case XREF_INITIALIZER_PATH_PIECE: {
TypeID TID = 0;
Identifier memberName;
Optional<swift::CtorInitializerKind> ctorInit;
bool isType = false;
bool inProtocolExt = false;
bool isStatic = false;
switch (recordID) {
case XREF_TYPE_PATH_PIECE: {
IdentifierID IID;
XRefTypePathPieceLayout::readRecord(scratch, IID, inProtocolExt);
memberName = getIdentifier(IID);
isType = true;
break;
}
case XREF_VALUE_PATH_PIECE: {
IdentifierID IID;
XRefValuePathPieceLayout::readRecord(scratch, TID, IID, inProtocolExt,
isStatic);
memberName = getIdentifier(IID);
break;
}
case XREF_INITIALIZER_PATH_PIECE: {
uint8_t kind;
XRefInitializerPathPieceLayout::readRecord(scratch, TID, inProtocolExt,
kind);
memberName = getContext().Id_init;
ctorInit = getActualCtorInitializerKind(kind);
break;
}
default:
llvm_unreachable("Unhandled path piece");
}
pathTrace.addValue(memberName);
Type filterTy = getType(TID);
if (!isType)
pathTrace.addType(filterTy);
if (values.size() != 1) {
return llvm::make_error<XRefError>("multiple matching base values",
pathTrace);
}
auto nominal = dyn_cast<NominalTypeDecl>(values.front());
values.clear();
if (!nominal) {
return llvm::make_error<XRefError>("base is not a nominal type",
pathTrace);
}
auto members = nominal->lookupDirect(memberName);
values.append(members.begin(), members.end());
filterValues(filterTy, M, genericSig, isType, inProtocolExt, isStatic,
ctorInit, values);
break;
}
case XREF_EXTENSION_PATH_PIECE: {
ModuleID ownerID;
ArrayRef<uint64_t> genericParamIDs;
XRefExtensionPathPieceLayout::readRecord(scratch, ownerID,
genericParamIDs);
M = getModule(ownerID);
pathTrace.addExtension(M);
// Read the generic signature, if we have one.
if (!genericParamIDs.empty()) {
SmallVector<GenericTypeParamType *, 4> params;
SmallVector<Requirement, 5> requirements;
for (TypeID paramID : genericParamIDs) {
params.push_back(getType(paramID)->castTo<GenericTypeParamType>());
}
readGenericRequirements(requirements, DeclTypeCursor);
genericSig = GenericSignature::getCanonical(params, requirements);
}
continue;
}
case XREF_OPERATOR_OR_ACCESSOR_PATH_PIECE: {
uint8_t rawKind;
XRefOperatorOrAccessorPathPieceLayout::readRecord(scratch, None,
rawKind);
if (values.size() == 1) {
if (auto storage = dyn_cast<AbstractStorageDecl>(values.front())) {
pathTrace.addAccessor(rawKind);
switch (rawKind) {
case Getter:
values.front() = storage->getGetter();
break;
case Setter:
values.front() = storage->getSetter();
break;
case MaterializeForSet:
values.front() = storage->getMaterializeForSetFunc();
break;
case Addressor:
values.front() = storage->getAddressor();
break;
case MutableAddressor:
values.front() = storage->getMutableAddressor();
break;
case WillSet:
case DidSet:
llvm_unreachable("invalid XREF accessor kind");
default:
// Unknown accessor kind.
error();
return nullptr;
}
break;
}
}
pathTrace.addOperatorFilter(rawKind);
auto newEnd = std::remove_if(values.begin(), values.end(),
[=](ValueDecl *value) {
auto fn = dyn_cast<FuncDecl>(value);
if (!fn)
return true;
if (!fn->getOperatorDecl())
return true;
if (getStableFixity(fn->getOperatorDecl()->getKind()) != rawKind)
return true;
return false;
});
values.erase(newEnd, values.end());
break;
}
case XREF_GENERIC_PARAM_PATH_PIECE: {
if (values.size() != 1) {
return llvm::make_error<XRefError>("multiple matching base values",
pathTrace);
}
uint32_t paramIndex;
XRefGenericParamPathPieceLayout::readRecord(scratch, paramIndex);
pathTrace.addGenericParam(paramIndex);
ValueDecl *base = values.front();
GenericParamList *paramList = nullptr;
if (auto nominal = dyn_cast<NominalTypeDecl>(base)) {
if (genericSig) {
// Find an extension in the requested module that has the
// correct generic signature.
for (auto ext : nominal->getExtensions()) {
if (ext->getModuleContext() == M &&
ext->getGenericSignature()->getCanonicalSignature()
== genericSig) {
paramList = ext->getGenericParams();
break;
}
}
assert(paramList && "Couldn't find constrained extension");
} else {
// Simple case: use the nominal type's generic parameters.
paramList = nominal->getGenericParams();
}
} else if (auto alias = dyn_cast<TypeAliasDecl>(base)) {
paramList = alias->getGenericParams();
} else if (auto fn = dyn_cast<AbstractFunctionDecl>(base))
paramList = fn->getGenericParams();
if (!paramList) {
return llvm::make_error<XRefError>(
"cross-reference to generic param for non-generic type",
pathTrace);
}
if (paramIndex >= paramList->size()) {
return llvm::make_error<XRefError>(
"generic argument index out of bounds",
pathTrace);
}
values.clear();
values.push_back(paramList->getParams()[paramIndex]);
assert(values.back());
break;
}
default:
// Unknown xref path piece.
pathTrace.addUnknown(recordID);
error();
return nullptr;
}
Optional<PrettyStackTraceModuleFile> traceMsg;
if (M != getAssociatedModule()) {
traceMsg.emplace("If you're seeing a crash here, check that your SDK "
"and dependencies match the versions used to build",
this);
}
if (values.empty()) {
return llvm::make_error<XRefError>("result not found", pathTrace);
}
// Reset the module filter.
M = nullptr;
genericSig = nullptr;
}
// Make sure we /used/ the last module filter we got.
// This catches the case where the last path piece we saw was an Extension
// path piece, which is not a valid way to end a path. (Cross-references to
// extensions are not allowed because they cannot be uniquely named.)
if (M) {
error();
return nullptr;
}
// When all is said and done, we should have a single value here to return.
if (values.size() != 1) {
return llvm::make_error<llvm::StringError>(
"result is ambiguous",
std::error_code(EINVAL, std::generic_category()));
}
return values.front();
}
Identifier ModuleFile::getIdentifier(IdentifierID IID) {
if (IID == 0)
return Identifier();
size_t rawID = IID - NUM_SPECIAL_MODULES;
assert(rawID < Identifiers.size() && "invalid identifier ID");
auto identRecord = Identifiers[rawID];
if (identRecord.Offset == 0)
return identRecord.Ident;
assert(!IdentifierData.empty() && "no identifier data in module");
StringRef rawStrPtr = IdentifierData.substr(identRecord.Offset);
size_t terminatorOffset = rawStrPtr.find('\0');
assert(terminatorOffset != StringRef::npos &&
"unterminated identifier string data");
return getContext().getIdentifier(rawStrPtr.slice(0, terminatorOffset));
}
DeclContext *ModuleFile::getLocalDeclContext(DeclContextID DCID) {
assert(DCID != 0 && "invalid local DeclContext ID 0");
auto &declContextOrOffset = LocalDeclContexts[DCID-1];
if (declContextOrOffset.isComplete())
return declContextOrOffset;
BCOffsetRAII restoreOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(declContextOrOffset);
auto entry = DeclTypeCursor.advance();
if (entry.Kind != llvm::BitstreamEntry::Record) {
error();
return nullptr;
}
ASTContext &ctx = getContext();
SmallVector<uint64_t, 64> scratch;
StringRef blobData;
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch,
&blobData);
switch(recordID) {
case decls_block::ABSTRACT_CLOSURE_EXPR_CONTEXT: {
TypeID closureTypeID;
unsigned discriminator = 0;
bool implicit = false;
DeclContextID parentID;
decls_block::AbstractClosureExprLayout::readRecord(scratch,
closureTypeID,
implicit,
discriminator,
parentID);
DeclContext *parent = getDeclContext(parentID);
auto type = getType(closureTypeID);
declContextOrOffset = new (ctx)
SerializedAbstractClosureExpr(type, implicit, discriminator, parent);
break;
}
case decls_block::TOP_LEVEL_CODE_DECL_CONTEXT: {
DeclContextID parentID;
decls_block::TopLevelCodeDeclContextLayout::readRecord(scratch,
parentID);
DeclContext *parent = getDeclContext(parentID);
declContextOrOffset = new (ctx) SerializedTopLevelCodeDeclContext(parent);
break;
}
case decls_block::PATTERN_BINDING_INITIALIZER_CONTEXT: {
DeclID bindingID;
uint32_t bindingIndex;
decls_block::PatternBindingInitializerLayout::readRecord(scratch,
bindingID,
bindingIndex);
auto decl = getDecl(bindingID);
PatternBindingDecl *binding = cast<PatternBindingDecl>(decl);
if (!declContextOrOffset.isComplete())
declContextOrOffset = new (ctx)
SerializedPatternBindingInitializer(binding, bindingIndex);
break;
}
case decls_block::DEFAULT_ARGUMENT_INITIALIZER_CONTEXT: {
DeclContextID parentID;
unsigned index = 0;
decls_block::DefaultArgumentInitializerLayout::readRecord(scratch,
parentID,
index);
DeclContext *parent = getDeclContext(parentID);
declContextOrOffset = new (ctx)
SerializedDefaultArgumentInitializer(index, parent);
break;
}
default:
llvm_unreachable("Unknown record ID found when reading local DeclContext.");
}
return declContextOrOffset;
}
DeclContext *ModuleFile::getDeclContext(DeclContextID DCID) {
if (DCID == 0)
return FileContext;
assert(DCID <= DeclContexts.size() && "invalid DeclContext ID");
auto &declContextOrOffset = DeclContexts[DCID-1];
if (declContextOrOffset.isComplete())
return declContextOrOffset;
BCOffsetRAII restoreOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(declContextOrOffset);
auto entry = DeclTypeCursor.advance();
if (entry.Kind != llvm::BitstreamEntry::Record) {
error();
return nullptr;
}
SmallVector<uint64_t, 64> scratch;
StringRef blobData;
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch, &blobData);
if (recordID != decls_block::DECL_CONTEXT)
llvm_unreachable("Expected a DECL_CONTEXT record");
DeclContextID declOrDeclContextId;
bool isDecl;
decls_block::DeclContextLayout::readRecord(scratch, declOrDeclContextId,
isDecl);
if (!isDecl)
return getLocalDeclContext(declOrDeclContextId);
auto D = getDecl(declOrDeclContextId);
if (auto ND = dyn_cast<NominalTypeDecl>(D)) {
declContextOrOffset = ND;
} else if (auto ED = dyn_cast<ExtensionDecl>(D)) {
declContextOrOffset = ED;
} else if (auto AFD = dyn_cast<AbstractFunctionDecl>(D)) {
declContextOrOffset = AFD;
} else if (auto SD = dyn_cast<SubscriptDecl>(D)) {
declContextOrOffset = SD;
} else if (auto TAD = dyn_cast<TypeAliasDecl>(D)) {
declContextOrOffset = TAD;
} else {
llvm_unreachable("Unknown Decl : DeclContext kind");
}
return declContextOrOffset;
}
ModuleDecl *ModuleFile::getModule(ModuleID MID) {
if (MID < NUM_SPECIAL_MODULES) {
switch (static_cast<SpecialModuleID>(static_cast<uint8_t>(MID))) {
case BUILTIN_MODULE_ID:
return getContext().TheBuiltinModule;
case CURRENT_MODULE_ID:
return FileContext->getParentModule();
case OBJC_HEADER_MODULE_ID: {
auto clangImporter =
static_cast<ClangImporter *>(getContext().getClangModuleLoader());
return clangImporter->getImportedHeaderModule();
}
case NUM_SPECIAL_MODULES:
llvm_unreachable("implementation detail only");
}
}
return getModule(getIdentifier(MID));
}
ModuleDecl *ModuleFile::getModule(ArrayRef<Identifier> name) {
if (name.empty() || name.front().empty())
return getContext().TheBuiltinModule;
// FIXME: duplicated from NameBinder::getModule
if (name.size() == 1 &&
name.front() == FileContext->getParentModule()->getName()) {
if (!ShadowedModule) {
auto importer = getContext().getClangModuleLoader();
assert(importer && "no way to import shadowed module");
ShadowedModule = importer->loadModule(SourceLoc(),
{ { name.front(), SourceLoc() } });
}
return ShadowedModule;
}
SmallVector<ImportDecl::AccessPathElement, 4> importPath;
for (auto pathElem : name)
importPath.push_back({ pathElem, SourceLoc() });
return getContext().getModule(importPath);
}
/// Translate from the Serialization associativity enum values to the AST
/// strongly-typed enum.
///
/// The former is guaranteed to be stable, but may not reflect this version of
/// the AST.
static Optional<swift::Associativity> getActualAssociativity(uint8_t assoc) {
switch (assoc) {
case serialization::Associativity::LeftAssociative:
return swift::Associativity::Left;
case serialization::Associativity::RightAssociative:
return swift::Associativity::Right;
case serialization::Associativity::NonAssociative:
return swift::Associativity::None;
default:
return None;
}
}
static Optional<swift::StaticSpellingKind>
getActualStaticSpellingKind(uint8_t raw) {
switch (serialization::StaticSpellingKind(raw)) {
case serialization::StaticSpellingKind::None:
return swift::StaticSpellingKind::None;
case serialization::StaticSpellingKind::KeywordStatic:
return swift::StaticSpellingKind::KeywordStatic;
case serialization::StaticSpellingKind::KeywordClass:
return swift::StaticSpellingKind::KeywordClass;
}
return None;
}
static bool isDeclAttrRecord(unsigned ID) {
using namespace decls_block;
switch (ID) {
#define DECL_ATTR(NAME, CLASS, ...) case CLASS##_DECL_ATTR: return true;
#include "swift/Serialization/DeclTypeRecordNodes.def"
default: return false;
}
}
static Optional<swift::Accessibility>
getActualAccessibility(uint8_t raw) {
switch (serialization::AccessibilityKind(raw)) {
#define CASE(NAME) \
case serialization::AccessibilityKind::NAME: \
return Accessibility::NAME;
CASE(Private)
CASE(FilePrivate)
CASE(Internal)
CASE(Public)
CASE(Open)
#undef CASE
}
return None;
}
static Optional<swift::OptionalTypeKind>
getActualOptionalTypeKind(uint8_t raw) {
switch (serialization::OptionalTypeKind(raw)) {
case serialization::OptionalTypeKind::None:
return OTK_None;
case serialization::OptionalTypeKind::Optional:
return OTK_Optional;
case serialization::OptionalTypeKind::ImplicitlyUnwrappedOptional:
return OTK_ImplicitlyUnwrappedOptional;
}
return None;
}
static Optional<swift::AddressorKind>
getActualAddressorKind(uint8_t raw) {
switch (serialization::AddressorKind(raw)) {
case serialization::AddressorKind::NotAddressor:
return swift::AddressorKind::NotAddressor;
case serialization::AddressorKind::Unsafe:
return swift::AddressorKind::Unsafe;
case serialization::AddressorKind::Owning:
return swift::AddressorKind::Owning;
case serialization::AddressorKind::NativeOwning:
return swift::AddressorKind::NativeOwning;
case serialization::AddressorKind::NativePinning:
return swift::AddressorKind::NativePinning;
}
return None;
}
void ModuleFile::configureStorage(AbstractStorageDecl *decl,
unsigned rawStorageKind,
serialization::DeclID getter,
serialization::DeclID setter,
serialization::DeclID materializeForSet,
serialization::DeclID addressor,
serialization::DeclID mutableAddressor,
serialization::DeclID willSet,
serialization::DeclID didSet) {
// We currently don't serialize these locations.
SourceLoc beginLoc, endLoc;
auto makeAddressed = [&] {
decl->makeAddressed(beginLoc,
cast_or_null<FuncDecl>(getDecl(addressor)),
cast_or_null<FuncDecl>(getDecl(mutableAddressor)),
endLoc);
};
auto addTrivialAccessors = [&] {
decl->addTrivialAccessors(
cast_or_null<FuncDecl>(getDecl(getter)),
cast_or_null<FuncDecl>(getDecl(setter)),
cast_or_null<FuncDecl>(getDecl(materializeForSet)));
};
auto setObservingAccessors = [&] {
decl->setObservingAccessors(
cast_or_null<FuncDecl>(getDecl(getter)),
cast_or_null<FuncDecl>(getDecl(setter)),
cast_or_null<FuncDecl>(getDecl(materializeForSet)));
};
switch ((StorageKind) rawStorageKind) {
case StorageKind::Stored:
return;
case StorageKind::StoredWithTrivialAccessors:
addTrivialAccessors();
return;
case StorageKind::StoredWithObservers:
decl->makeStoredWithObservers(beginLoc,
cast_or_null<FuncDecl>(getDecl(willSet)),
cast_or_null<FuncDecl>(getDecl(didSet)),
endLoc);
setObservingAccessors();
return;
case StorageKind::InheritedWithObservers:
decl->makeInheritedWithObservers(beginLoc,
cast_or_null<FuncDecl>(getDecl(willSet)),
cast_or_null<FuncDecl>(getDecl(didSet)),
endLoc);
setObservingAccessors();
return;
case StorageKind::Addressed:
makeAddressed();
return;
case StorageKind::AddressedWithTrivialAccessors:
makeAddressed();
addTrivialAccessors();
return;
case StorageKind::AddressedWithObservers:
decl->makeAddressedWithObservers(beginLoc,
cast_or_null<FuncDecl>(getDecl(addressor)),
cast_or_null<FuncDecl>(getDecl(mutableAddressor)),
cast_or_null<FuncDecl>(getDecl(willSet)),
cast_or_null<FuncDecl>(getDecl(didSet)),
endLoc);
setObservingAccessors();
return;
case StorageKind::Computed:
decl->makeComputed(beginLoc,
cast_or_null<FuncDecl>(getDecl(getter)),
cast_or_null<FuncDecl>(getDecl(setter)),
cast_or_null<FuncDecl>(getDecl(materializeForSet)),
endLoc);
return;
case StorageKind::ComputedWithMutableAddress:
decl->makeComputedWithMutableAddress(beginLoc,
cast_or_null<FuncDecl>(getDecl(getter)),
cast_or_null<FuncDecl>(getDecl(setter)),
cast_or_null<FuncDecl>(getDecl(materializeForSet)),
cast_or_null<FuncDecl>(getDecl(mutableAddressor)),
endLoc);
return;
}
llvm_unreachable("bad storage kind");
}
template <typename T, typename ...Args>
T *ModuleFile::createDecl(Args &&... args) {
// Note that this method is not used for all decl kinds.
static_assert(std::is_base_of<Decl, T>::value, "not a Decl");
T *result = new (getContext()) T(std::forward<Args>(args)...);
result->setEarlyAttrValidation(true);
return result;
}
static const uint64_t lazyConformanceContextDataPositionMask = 0xFFFFFFFFFFFF;
/// Decode the context data for lazily-loaded conformances.
static std::pair<uint64_t, uint64_t> decodeLazyConformanceContextData(
uint64_t contextData) {
return std::make_pair(contextData >> 48,
contextData & lazyConformanceContextDataPositionMask);
}
/// Encode the context data for lazily-loaded conformances.
static uint64_t encodeLazyConformanceContextData(uint64_t numProtocols,
uint64_t bitPosition) {
assert(numProtocols < 0xFFFF);
assert(bitPosition < lazyConformanceContextDataPositionMask);
return (numProtocols << 48) | bitPosition;
}
Decl *ModuleFile::getDecl(DeclID DID, Optional<DeclContext *> ForcedContext) {
Expected<Decl *> deserialized = getDeclChecked(DID, ForcedContext);
if (!deserialized) {
fatal(deserialized.takeError());
}
return deserialized.get();
}
Expected<Decl *>
ModuleFile::getDeclChecked(DeclID DID, Optional<DeclContext *> ForcedContext) {
if (DID == 0)
return nullptr;
assert(DID <= Decls.size() && "invalid decl ID");
auto &declOrOffset = Decls[DID-1];
if (declOrOffset.isComplete())
return declOrOffset;
++NumDeclsLoaded;
BCOffsetRAII restoreOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(declOrOffset);
auto entry = DeclTypeCursor.advance();
if (entry.Kind != llvm::BitstreamEntry::Record) {
// We don't know how to serialize decls represented by sub-blocks.
error();
return nullptr;
}
ASTContext &ctx = getContext();
SmallVector<uint64_t, 64> scratch;
StringRef blobData;
// Read the attributes (if any).
DeclAttribute *DAttrs = nullptr;
DeclAttribute **AttrsNext = &DAttrs;
auto AddAttribute = [&](DeclAttribute *Attr) {
// Advance the linked list.
*AttrsNext = Attr;
AttrsNext = Attr->getMutableNext();
};
unsigned recordID;
class PrivateDiscriminatorRAII {
ModuleFile &moduleFile;
Serialized<Decl *> &declOrOffset;
public:
Identifier discriminator;
PrivateDiscriminatorRAII(ModuleFile &moduleFile,
Serialized<Decl *> &declOrOffset)
: moduleFile(moduleFile), declOrOffset(declOrOffset) {}
~PrivateDiscriminatorRAII() {
if (!discriminator.empty() && declOrOffset.isComplete())
if (auto value = dyn_cast_or_null<ValueDecl>(declOrOffset.get()))
moduleFile.PrivateDiscriminatorsByValue[value] = discriminator;
}
};
class LocalDiscriminatorRAII {
Serialized<Decl *> &declOrOffset;
public:
unsigned discriminator;
LocalDiscriminatorRAII(Serialized<Decl *> &declOrOffset)
: declOrOffset(declOrOffset), discriminator(0) {}
~LocalDiscriminatorRAII() {
if (discriminator != 0 && declOrOffset.isComplete())
if (auto value = dyn_cast<ValueDecl>(declOrOffset.get()))
value->setLocalDiscriminator(discriminator);
}
};
PrivateDiscriminatorRAII privateDiscriminatorRAII{*this, declOrOffset};
LocalDiscriminatorRAII localDiscriminatorRAII(declOrOffset);
DeserializingEntityRAII deserializingEntity(*this);
// Local function that handles the "inherited" list for a type.
auto handleInherited
= [&](TypeDecl *nominal, ArrayRef<uint64_t> rawInheritedIDs) {
auto inheritedTypes = ctx.Allocate<TypeLoc>(rawInheritedIDs.size());
for_each(inheritedTypes, rawInheritedIDs,
[this](TypeLoc &tl, uint64_t rawID) {
tl = TypeLoc::withoutLoc(getType(rawID));
});
nominal->setInherited(inheritedTypes);
nominal->setCheckedInheritanceClause();
};
while (true) {
if (entry.Kind != llvm::BitstreamEntry::Record) {
// We don't know how to serialize decls represented by sub-blocks.
error();
return nullptr;
}
recordID = DeclTypeCursor.readRecord(entry.ID, scratch, &blobData);
if (isDeclAttrRecord(recordID)) {
DeclAttribute *Attr = nullptr;
switch (recordID) {
case decls_block::SILGenName_DECL_ATTR: {
bool isImplicit;
serialization::decls_block::SILGenNameDeclAttrLayout::readRecord(
scratch, isImplicit);
Attr = new (ctx) SILGenNameAttr(blobData, isImplicit);
break;
}
case decls_block::CDecl_DECL_ATTR: {
bool isImplicit;
serialization::decls_block::CDeclDeclAttrLayout::readRecord(
scratch, isImplicit);
Attr = new (ctx) CDeclAttr(blobData, isImplicit);
break;
}
case decls_block::Alignment_DECL_ATTR: {
bool isImplicit;
unsigned alignment;
serialization::decls_block::AlignmentDeclAttrLayout::readRecord(
scratch, isImplicit, alignment);
Attr = new (ctx) AlignmentAttr(alignment, SourceLoc(), SourceRange(),
isImplicit);
break;
}
case decls_block::SwiftNativeObjCRuntimeBase_DECL_ATTR: {
bool isImplicit;
IdentifierID nameID;
serialization::decls_block::SwiftNativeObjCRuntimeBaseDeclAttrLayout
::readRecord(scratch, isImplicit, nameID);
auto name = getIdentifier(nameID);
Attr = new (ctx) SwiftNativeObjCRuntimeBaseAttr(name, SourceLoc(),
SourceRange(),
isImplicit);
break;
}
case decls_block::Semantics_DECL_ATTR: {
bool isImplicit;
serialization::decls_block::SemanticsDeclAttrLayout::readRecord(
scratch, isImplicit);
Attr = new (ctx) SemanticsAttr(blobData, isImplicit);
break;
}
case decls_block::Inline_DECL_ATTR: {
unsigned kind;
serialization::decls_block::InlineDeclAttrLayout::readRecord(
scratch, kind);
Attr = new (ctx) InlineAttr((InlineKind)kind);
break;
}
case decls_block::Effects_DECL_ATTR: {
unsigned kind;
serialization::decls_block::EffectsDeclAttrLayout::readRecord(scratch,
kind);
Attr = new (ctx) EffectsAttr((EffectsKind)kind);
break;
}
case decls_block::Available_DECL_ATTR: {
#define LIST_VER_TUPLE_PIECES(X)\
X##_Major, X##_Minor, X##_Subminor, X##_HasMinor, X##_HasSubminor
#define DEF_VER_TUPLE_PIECES(X) unsigned LIST_VER_TUPLE_PIECES(X)
#define DECODE_VER_TUPLE(X)\
if (X##_HasMinor) {\
if (X##_HasSubminor)\
X = clang::VersionTuple(X##_Major, X##_Minor, X##_Subminor);\
else\
X = clang::VersionTuple(X##_Major, X##_Minor);\
}\
else X = clang::VersionTuple(X##_Major);
bool isImplicit;
bool isUnavailable;
bool isDeprecated;
DEF_VER_TUPLE_PIECES(Introduced);
DEF_VER_TUPLE_PIECES(Deprecated);
DEF_VER_TUPLE_PIECES(Obsoleted);
unsigned platform, messageSize, renameSize;
// Decode the record, pulling the version tuple information.
serialization::decls_block::AvailableDeclAttrLayout::readRecord(
scratch, isImplicit, isUnavailable, isDeprecated,
LIST_VER_TUPLE_PIECES(Introduced),
LIST_VER_TUPLE_PIECES(Deprecated),
LIST_VER_TUPLE_PIECES(Obsoleted),
platform, messageSize, renameSize);
StringRef message = blobData.substr(0, messageSize);
blobData = blobData.substr(messageSize);
StringRef rename = blobData.substr(0, renameSize);
clang::VersionTuple Introduced, Deprecated, Obsoleted;
DECODE_VER_TUPLE(Introduced)
DECODE_VER_TUPLE(Deprecated)
DECODE_VER_TUPLE(Obsoleted)
PlatformAgnosticAvailabilityKind platformAgnostic;
if (isUnavailable)
platformAgnostic = PlatformAgnosticAvailabilityKind::Unavailable;
else if (isDeprecated)
platformAgnostic = PlatformAgnosticAvailabilityKind::Deprecated;
else if (((PlatformKind)platform) == PlatformKind::none &&
(!Introduced.empty() ||
!Deprecated.empty() ||
!Obsoleted.empty()))
platformAgnostic =
PlatformAgnosticAvailabilityKind::SwiftVersionSpecific;
else
platformAgnostic = PlatformAgnosticAvailabilityKind::None;
Attr = new (ctx) AvailableAttr(
SourceLoc(), SourceRange(),
(PlatformKind)platform, message, rename,
Introduced, SourceRange(),
Deprecated, SourceRange(),
Obsoleted, SourceRange(),
platformAgnostic, isImplicit);
break;
#undef DEF_VER_TUPLE_PIECES
#undef LIST_VER_TUPLE_PIECES
#undef DECODE_VER_TUPLE
}
case decls_block::AutoClosure_DECL_ATTR: {
bool isImplicit;
bool isEscaping;
serialization::decls_block::AutoClosureDeclAttrLayout::readRecord(
scratch, isImplicit, isEscaping);
Attr = new (ctx) AutoClosureAttr(SourceLoc(), SourceRange(),
isEscaping, isImplicit);
break;
}
case decls_block::ObjC_DECL_ATTR: {
bool isImplicit;
bool isImplicitName;
bool isSwift3Inferred;
uint64_t numArgs;
ArrayRef<uint64_t> rawPieceIDs;
serialization::decls_block::ObjCDeclAttrLayout::readRecord(
scratch, isImplicit, isSwift3Inferred, isImplicitName, numArgs,
rawPieceIDs);
SmallVector<Identifier, 4> pieces;
for (auto pieceID : rawPieceIDs)
pieces.push_back(getIdentifier(pieceID));
if (numArgs == 0)
Attr = ObjCAttr::create(ctx, None, isImplicitName);
else
Attr = ObjCAttr::create(ctx, ObjCSelector(ctx, numArgs-1, pieces),
isImplicitName);
Attr->setImplicit(isImplicit);
cast<ObjCAttr>(Attr)->setSwift3Inferred(isSwift3Inferred);
break;
}
case decls_block::Specialize_DECL_ATTR: {
unsigned exported;
SpecializeAttr::SpecializationKind specializationKind;
unsigned specializationKindVal;
SmallVector<Requirement, 8> requirements;
serialization::decls_block::SpecializeDeclAttrLayout::readRecord(
scratch, exported, specializationKindVal);
specializationKind = specializationKindVal
? SpecializeAttr::SpecializationKind::Partial
: SpecializeAttr::SpecializationKind::Full;
readGenericRequirements(requirements, DeclTypeCursor);
Attr = SpecializeAttr::create(ctx, SourceLoc(), SourceRange(),
requirements, exported != 0,
specializationKind);
break;
}
#define SIMPLE_DECL_ATTR(NAME, CLASS, ...) \
case decls_block::CLASS##_DECL_ATTR: { \
bool isImplicit; \
serialization::decls_block::CLASS##DeclAttrLayout::readRecord( \
scratch, isImplicit); \
Attr = new (ctx) CLASS##Attr(isImplicit); \
break; \
}
#include "swift/AST/Attr.def"
default:
// We don't know how to deserialize this kind of attribute.
error();
return nullptr;
}
if (!Attr)
return nullptr;
AddAttribute(Attr);
} else if (recordID == decls_block::PRIVATE_DISCRIMINATOR) {
IdentifierID discriminatorID;
decls_block::PrivateDiscriminatorLayout::readRecord(scratch,
discriminatorID);
privateDiscriminatorRAII.discriminator = getIdentifier(discriminatorID);
} else if (recordID == decls_block::LOCAL_DISCRIMINATOR) {
unsigned discriminator;
decls_block::LocalDiscriminatorLayout::readRecord(scratch, discriminator);
localDiscriminatorRAII.discriminator = discriminator;
} else {
break;
}
// Advance bitstream cursor to the next record.
entry = DeclTypeCursor.advance();
// Prepare to read the next record.
scratch.clear();
}
PrettyDeclDeserialization stackTraceEntry(
this, declOrOffset, DID, static_cast<decls_block::RecordKind>(recordID));
switch (recordID) {
case decls_block::TYPE_ALIAS_DECL: {
IdentifierID nameID;
DeclContextID contextID;
TypeID underlyingTypeID, interfaceTypeID;
bool isImplicit;
GenericEnvironmentID genericEnvID;
uint8_t rawAccessLevel;
decls_block::TypeAliasLayout::readRecord(scratch, nameID, contextID,
underlyingTypeID, interfaceTypeID,
isImplicit, genericEnvID,
rawAccessLevel);
auto DC = ForcedContext ? *ForcedContext : getDeclContext(contextID);
auto genericParams = maybeReadGenericParams(DC);
if (declOrOffset.isComplete())
return declOrOffset;
auto alias = createDecl<TypeAliasDecl>(SourceLoc(), SourceLoc(),
getIdentifier(nameID),
SourceLoc(), genericParams, DC);
declOrOffset = alias;
configureGenericEnvironment(alias, genericEnvID);
alias->setUnderlyingType(getType(underlyingTypeID));
if (auto accessLevel = getActualAccessibility(rawAccessLevel)) {
alias->setAccessibility(*accessLevel);
} else {
error();
return nullptr;
}
if (isImplicit)
alias->setImplicit();
alias->setCheckedInheritanceClause();
break;
}
case decls_block::GENERIC_TYPE_PARAM_DECL: {
IdentifierID nameID;
DeclContextID contextID;
bool isImplicit;
unsigned depth;
unsigned index;
decls_block::GenericTypeParamDeclLayout::readRecord(scratch, nameID,
contextID,
isImplicit,
depth,
index);
auto DC = ForcedContext ? *ForcedContext : getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto genericParam = createDecl<GenericTypeParamDecl>(DC,
getIdentifier(nameID),
SourceLoc(),
depth,
index);
declOrOffset = genericParam;
if (isImplicit)
genericParam->setImplicit();
break;
}
case decls_block::ASSOCIATED_TYPE_DECL: {
IdentifierID nameID;
DeclContextID contextID;
TypeID defaultDefinitionID;
bool isImplicit;
ArrayRef<uint64_t> rawInheritedIDs;
decls_block::AssociatedTypeDeclLayout::readRecord(scratch, nameID,
contextID,
defaultDefinitionID,
isImplicit,
rawInheritedIDs);
auto DC = ForcedContext ? *ForcedContext : getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
// The where-clause information is pushed up into the protocol
// (specifically, into its requirement signature) and
// serialized/deserialized there, so the actual Decl doesn't need to store
// it.
TrailingWhereClause *trailingWhere = nullptr;
auto assocType = createDecl<AssociatedTypeDecl>(
DC, SourceLoc(), getIdentifier(nameID), SourceLoc(), trailingWhere,
this, defaultDefinitionID);
declOrOffset = assocType;
assocType->computeType();
assert(!assocType->getDeclaredInterfaceType()->hasError() &&
"erroneous associated type");
Accessibility parentAccess = cast<ProtocolDecl>(DC)->getFormalAccess();
assocType->setAccessibility(std::max(parentAccess,Accessibility::Internal));
if (isImplicit)
assocType->setImplicit();
auto inherited = ctx.Allocate<TypeLoc>(rawInheritedIDs.size());
for_each(inherited, rawInheritedIDs, [this](TypeLoc &loc, uint64_t rawID) {
loc.setType(getType(rawID));
});
assocType->setInherited(inherited);
assocType->setCheckedInheritanceClause();
break;
}
case decls_block::STRUCT_DECL: {
IdentifierID nameID;
DeclContextID contextID;
bool isImplicit;
GenericEnvironmentID genericEnvID;
uint8_t rawAccessLevel;
unsigned numConformances;
ArrayRef<uint64_t> rawInheritedIDs;
decls_block::StructLayout::readRecord(scratch, nameID, contextID,
isImplicit, genericEnvID,
rawAccessLevel,
numConformances,
rawInheritedIDs);
auto DC = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto genericParams = maybeReadGenericParams(DC);
if (declOrOffset.isComplete())
return declOrOffset;
auto theStruct = createDecl<StructDecl>(SourceLoc(), getIdentifier(nameID),
SourceLoc(), None, genericParams,
DC);
declOrOffset = theStruct;
// Read the generic environment.
configureGenericEnvironment(theStruct, genericEnvID);
if (auto accessLevel = getActualAccessibility(rawAccessLevel)) {
theStruct->setAccessibility(*accessLevel);
} else {
error();
return nullptr;
}
if (isImplicit)
theStruct->setImplicit();
theStruct->computeType();
handleInherited(theStruct, rawInheritedIDs);
theStruct->setMemberLoader(this, DeclTypeCursor.GetCurrentBitNo());
skipRecord(DeclTypeCursor, decls_block::MEMBERS);
theStruct->setConformanceLoader(
this,
encodeLazyConformanceContextData(numConformances,
DeclTypeCursor.GetCurrentBitNo()));
break;
}
case decls_block::CONSTRUCTOR_DECL: {
DeclContextID contextID;
uint8_t rawFailability;
bool isImplicit, isObjC, hasStubImplementation, throws;
GenericEnvironmentID genericEnvID;
uint8_t storedInitKind, rawAccessLevel;
TypeID interfaceID;
DeclID overriddenID;
ArrayRef<uint64_t> argNameIDs;
decls_block::ConstructorLayout::readRecord(scratch, contextID,
rawFailability, isImplicit,
isObjC, hasStubImplementation,
throws, storedInitKind,
genericEnvID, interfaceID,
overriddenID, rawAccessLevel,
argNameIDs);
auto parent = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto *genericParams = maybeReadGenericParams(parent);
if (declOrOffset.isComplete())
return declOrOffset;
// Resolve the name ids.
SmallVector<Identifier, 2> argNames;
for (auto argNameID : argNameIDs)
argNames.push_back(getIdentifier(argNameID));
OptionalTypeKind failability = OTK_None;
if (auto actualFailability = getActualOptionalTypeKind(rawFailability))
failability = *actualFailability;
DeclName name(ctx, ctx.Id_init, argNames);
auto ctor =
createDecl<ConstructorDecl>(name, SourceLoc(),
failability, /*FailabilityLoc=*/SourceLoc(),
/*Throws=*/throws, /*ThrowsLoc=*/SourceLoc(),
/*BodyParams=*/nullptr, nullptr,
genericParams, parent);
declOrOffset = ctor;
configureGenericEnvironment(ctor, genericEnvID);
if (auto accessLevel = getActualAccessibility(rawAccessLevel)) {
ctor->setAccessibility(*accessLevel);
} else {
error();
return nullptr;
}
auto *bodyParams0 = readParameterList();
bodyParams0->get(0)->setImplicit(); // self is implicit.
auto *bodyParams1 = readParameterList();
assert(bodyParams0 && bodyParams1 && "missing parameters for constructor");
ctor->setParameterLists(bodyParams0->get(0), bodyParams1);
auto interfaceType = getType(interfaceID);
ctor->setInterfaceType(interfaceType);
// Set the initializer interface type of the constructor.
auto allocType = ctor->getInterfaceType();
auto selfTy = ctor->computeInterfaceSelfType(/*isInitializingCtor=*/true);
if (auto polyFn = allocType->getAs<GenericFunctionType>()) {
ctor->setInitializerInterfaceType(
GenericFunctionType::get(polyFn->getGenericSignature(),
selfTy, polyFn->getResult(),
polyFn->getExtInfo()));
} else {
auto fn = allocType->castTo<FunctionType>();
ctor->setInitializerInterfaceType(FunctionType::get(selfTy,
fn->getResult(),
fn->getExtInfo()));
}
if (auto errorConvention = maybeReadForeignErrorConvention())
ctor->setForeignErrorConvention(*errorConvention);
if (isImplicit)
ctor->setImplicit();
if (hasStubImplementation)
ctor->setStubImplementation(true);
if (auto initKind = getActualCtorInitializerKind(storedInitKind))
ctor->setInitKind(*initKind);
if (auto overridden
= dyn_cast_or_null<ConstructorDecl>(getDecl(overriddenID)))
ctor->setOverriddenDecl(overridden);
break;
}
case decls_block::VAR_DECL: {
IdentifierID nameID;
DeclContextID contextID;
bool isImplicit, isObjC, isStatic, isLet, hasNonPatternBindingInit;
uint8_t storageKind, rawAccessLevel, rawSetterAccessLevel;
TypeID interfaceTypeID;
DeclID getterID, setterID, materializeForSetID, willSetID, didSetID;
DeclID addressorID, mutableAddressorID, overriddenID;
decls_block::VarLayout::readRecord(scratch, nameID, contextID,
isImplicit, isObjC, isStatic, isLet,
hasNonPatternBindingInit, storageKind,
interfaceTypeID, getterID,
setterID, materializeForSetID,
addressorID, mutableAddressorID,
willSetID, didSetID, overriddenID,
rawAccessLevel, rawSetterAccessLevel);
Identifier name = getIdentifier(nameID);
Expected<Decl *> overridden = getDeclChecked(overriddenID);
if (!overridden) {
llvm::handleAllErrors(overridden.takeError(),
[](const XRefError &) { /* expected */ },
[this](std::unique_ptr<llvm::ErrorInfoBase> unhandled){
fatal(std::move(unhandled));
});
return llvm::make_error<OverrideError>(name);
}
auto DC = ForcedContext ? *ForcedContext : getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto var = createDecl<VarDecl>(/*IsStatic*/isStatic, /*IsLet*/isLet,
/*IsCaptureList*/false, SourceLoc(), name,
Type(), DC);
var->setHasNonPatternBindingInit(hasNonPatternBindingInit);
declOrOffset = var;
Type interfaceType = getType(interfaceTypeID);
var->setInterfaceType(interfaceType);
if (auto referenceStorage = interfaceType->getAs<ReferenceStorageType>())
AddAttribute(new (ctx) OwnershipAttr(referenceStorage->getOwnership()));
configureStorage(var, storageKind, getterID, setterID, materializeForSetID,
addressorID, mutableAddressorID, willSetID, didSetID);
if (auto accessLevel = getActualAccessibility(rawAccessLevel)) {
var->setAccessibility(*accessLevel);
} else {
error();
return nullptr;
}
if (var->isSettable(nullptr)) {
if (auto setterAccess = getActualAccessibility(rawSetterAccessLevel)) {
var->setSetterAccessibility(*setterAccess);
} else {
error();
return nullptr;
}
}
if (isImplicit)
var->setImplicit();
if (auto overriddenVar = cast_or_null<VarDecl>(overridden.get())) {
var->setOverriddenDecl(overriddenVar);
AddAttribute(new (ctx) OverrideAttr(SourceLoc()));
}
break;
}
case decls_block::PARAM_DECL: {
IdentifierID argNameID, paramNameID;
DeclContextID contextID;
bool isLet;
TypeID interfaceTypeID;
decls_block::ParamLayout::readRecord(scratch, argNameID, paramNameID,
contextID, isLet, interfaceTypeID);
auto DC = ForcedContext ? *ForcedContext : getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto param = createDecl<ParamDecl>(isLet, SourceLoc(), SourceLoc(),
getIdentifier(argNameID), SourceLoc(),
getIdentifier(paramNameID), Type(), DC);
declOrOffset = param;
auto paramTy = getType(interfaceTypeID);
if (paramTy->hasError()) {
// FIXME: This should never happen, because we don't serialize
// error types.
DC->dumpContext();
paramTy->dump();
error();
return nullptr;
}
param->setInterfaceType(paramTy);
break;
}
case decls_block::FUNC_DECL: {
DeclContextID contextID;
bool isImplicit;
bool isStatic;
uint8_t rawStaticSpelling, rawAccessLevel, rawAddressorKind;
bool isObjC, isMutating, hasDynamicSelf, throws;
unsigned numParamPatterns;
GenericEnvironmentID genericEnvID;
TypeID interfaceTypeID;
DeclID associatedDeclID;
DeclID overriddenID;
DeclID accessorStorageDeclID;
bool hasCompoundName;
ArrayRef<uint64_t> nameIDs;
decls_block::FuncLayout::readRecord(scratch, contextID, isImplicit,
isStatic, rawStaticSpelling, isObjC,
isMutating, hasDynamicSelf, throws,
numParamPatterns, genericEnvID,
interfaceTypeID, associatedDeclID,
overriddenID, accessorStorageDeclID,
hasCompoundName, rawAddressorKind,
rawAccessLevel, nameIDs);
// Resolve the name ids.
SmallVector<Identifier, 2> names;
for (auto nameID : nameIDs)
names.push_back(getIdentifier(nameID));
DeclName name;
if (!names.empty()) {
if (hasCompoundName)
name = DeclName(ctx, names[0],
llvm::makeArrayRef(names.begin() + 1, names.end()));
else
name = DeclName(names[0]);
}
Expected<Decl *> overridden = getDeclChecked(overriddenID);
if (!overridden) {
llvm::handleAllErrors(overridden.takeError(),
[](const XRefError &) { /* expected */ },
[this](std::unique_ptr<llvm::ErrorInfoBase> unhandled) {
fatal(std::move(unhandled));
});
return llvm::make_error<OverrideError>(name);
}
auto DC = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
// Read generic params before reading the type, because the type may
// reference generic parameters, and we want them to have a dummy
// DeclContext for now.
GenericParamList *genericParams = maybeReadGenericParams(DC);
auto staticSpelling = getActualStaticSpellingKind(rawStaticSpelling);
if (!staticSpelling.hasValue()) {
error();
return nullptr;
}
if (declOrOffset.isComplete())
return declOrOffset;
auto fn = FuncDecl::createDeserialized(
ctx, /*StaticLoc=*/SourceLoc(), staticSpelling.getValue(),
/*FuncLoc=*/SourceLoc(), name, /*NameLoc=*/SourceLoc(),
/*Throws=*/throws, /*ThrowsLoc=*/SourceLoc(),
/*AccessorKeywordLoc=*/SourceLoc(), genericParams,
numParamPatterns, DC);
fn->setEarlyAttrValidation();
declOrOffset = fn;
configureGenericEnvironment(fn, genericEnvID);
if (auto accessLevel = getActualAccessibility(rawAccessLevel)) {
fn->setAccessibility(*accessLevel);
} else {
error();
return nullptr;
}
if (auto addressorKind = getActualAddressorKind(rawAddressorKind)) {
if (*addressorKind != AddressorKind::NotAddressor)
fn->setAddressorKind(*addressorKind);
} else {
error();
return nullptr;
}
if (Decl *associated = getDecl(associatedDeclID)) {
if (auto op = dyn_cast<OperatorDecl>(associated)) {
fn->setOperatorDecl(op);
if (isa<PrefixOperatorDecl>(op))
fn->getAttrs().add(new (ctx) PrefixAttr(/*implicit*/false));
else if (isa<PostfixOperatorDecl>(op))
fn->getAttrs().add(new (ctx) PostfixAttr(/*implicit*/false));
// Note that an explicit 'infix' is not required.
}
// Otherwise, unknown associated decl kind.
}
// Set the interface type.
auto interfaceType = getType(interfaceTypeID);
fn->setInterfaceType(interfaceType);
SmallVector<ParameterList*, 2> paramLists;
for (unsigned i = 0, e = numParamPatterns; i != e; ++i)
paramLists.push_back(readParameterList());
// If the first parameter list is (self), mark it implicit.
if (numParamPatterns && DC->isTypeContext())
paramLists[0]->get(0)->setImplicit();
fn->setDeserializedSignature(paramLists, TypeLoc());
if (auto errorConvention = maybeReadForeignErrorConvention())
fn->setForeignErrorConvention(*errorConvention);
if (auto overriddenFunc = cast_or_null<FuncDecl>(overridden.get())) {
fn->setOverriddenDecl(overriddenFunc);
AddAttribute(new (ctx) OverrideAttr(SourceLoc()));
}
fn->setStatic(isStatic);
if (isImplicit)
fn->setImplicit();
fn->setMutating(isMutating);
fn->setDynamicSelf(hasDynamicSelf);
// If we are an accessor on a var or subscript, make sure it is deserialized
// too.
getDecl(accessorStorageDeclID);
break;
}
case decls_block::PATTERN_BINDING_DECL: {
DeclContextID contextID;
bool isImplicit;
bool isStatic;
uint8_t RawStaticSpelling;
unsigned numPatterns;
ArrayRef<uint64_t> initContextIDs;
decls_block::PatternBindingLayout::readRecord(scratch, contextID,
isImplicit,
isStatic,
RawStaticSpelling,
numPatterns,
initContextIDs);
auto StaticSpelling = getActualStaticSpellingKind(RawStaticSpelling);
if (!StaticSpelling.hasValue()) {
error();
return nullptr;
}
auto dc = getDeclContext(contextID);
SmallVector<std::pair<Pattern *, DeclContextID>, 4> patterns;
for (unsigned i = 0; i != numPatterns; ++i) {
auto pattern = readPattern(dc);
if (!pattern) {
// Silently drop the pattern if it had an override-related problem.
llvm::handleAllErrors(pattern.takeError(),
[](const OverrideError &) { /* expected */ },
[this](std::unique_ptr<llvm::ErrorInfoBase> unhandled) {
fatal(std::move(unhandled));
});
// ...but continue to read any further patterns we're expecting.
continue;
}
patterns.emplace_back(pattern.get(), DeclContextID());
if (!initContextIDs.empty())
patterns.back().second = initContextIDs[i];
}
auto binding =
PatternBindingDecl::createDeserialized(ctx, SourceLoc(),
StaticSpelling.getValue(),
SourceLoc(), patterns.size(), dc);
binding->setEarlyAttrValidation(true);
declOrOffset = binding;
binding->setStatic(isStatic);
if (isImplicit)
binding->setImplicit();
for (unsigned i = 0; i != patterns.size(); ++i) {
DeclContext *initContext = getDeclContext(patterns[i].second);
binding->setPattern(i, patterns[i].first, initContext);
}
break;
}
case decls_block::PROTOCOL_DECL: {
IdentifierID nameID;
DeclContextID contextID;
bool isImplicit, isClassBounded, isObjC;
GenericEnvironmentID genericEnvID;
uint8_t rawAccessLevel;
ArrayRef<uint64_t> rawInheritedIDs;
decls_block::ProtocolLayout::readRecord(scratch, nameID, contextID,
isImplicit, isClassBounded, isObjC,
genericEnvID, rawAccessLevel,
rawInheritedIDs);
auto DC = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto proto = createDecl<ProtocolDecl>(DC, SourceLoc(), SourceLoc(),
getIdentifier(nameID), None,
/*TrailingWhere=*/nullptr);
declOrOffset = proto;
proto->setRequiresClass(isClassBounded);
if (auto accessLevel = getActualAccessibility(rawAccessLevel)) {
proto->setAccessibility(*accessLevel);
} else {
error();
return nullptr;
}
auto genericParams = maybeReadGenericParams(DC);
assert(genericParams && "protocol with no generic parameters?");
proto->setGenericParams(genericParams);
handleInherited(proto, rawInheritedIDs);
configureGenericEnvironment(proto, genericEnvID);
SmallVector<Requirement, 4> requirements;
readGenericRequirements(requirements, DeclTypeCursor);
if (isImplicit)
proto->setImplicit();
proto->computeType();
auto signature = GenericSignature::get(
{ proto->getProtocolSelfType() }, requirements);
proto->setRequirementSignature(signature);
proto->setMemberLoader(this, DeclTypeCursor.GetCurrentBitNo());
proto->setCircularityCheck(CircularityCheck::Checked);
break;
}
case decls_block::PREFIX_OPERATOR_DECL: {
IdentifierID nameID;
DeclContextID contextID;
decls_block::PrefixOperatorLayout::readRecord(scratch, nameID,
contextID);
auto DC = getDeclContext(contextID);
declOrOffset = createDecl<PrefixOperatorDecl>(DC, SourceLoc(),
getIdentifier(nameID),
SourceLoc());
break;
}
case decls_block::POSTFIX_OPERATOR_DECL: {
IdentifierID nameID;
DeclContextID contextID;
decls_block::PostfixOperatorLayout::readRecord(scratch, nameID,
contextID);
auto DC = getDeclContext(contextID);
declOrOffset = createDecl<PostfixOperatorDecl>(DC, SourceLoc(),
getIdentifier(nameID),
SourceLoc());
break;
}
case decls_block::INFIX_OPERATOR_DECL: {
IdentifierID nameID;
DeclContextID contextID;
DeclID precedenceGroupID;
decls_block::InfixOperatorLayout::readRecord(scratch, nameID, contextID,
precedenceGroupID);
PrecedenceGroupDecl *precedenceGroup = nullptr;
Identifier precedenceGroupName;
if (precedenceGroupID) {
precedenceGroup =
dyn_cast_or_null<PrecedenceGroupDecl>(getDecl(precedenceGroupID));
if (precedenceGroup) {
precedenceGroupName = precedenceGroup->getName();
}
}
auto DC = getDeclContext(contextID);
auto result = createDecl<InfixOperatorDecl>(DC, SourceLoc(),
getIdentifier(nameID),
SourceLoc(), SourceLoc(),
precedenceGroupName,
SourceLoc());
result->setPrecedenceGroup(precedenceGroup);
declOrOffset = result;
break;
}
case decls_block::PRECEDENCE_GROUP_DECL: {
IdentifierID nameID;
DeclContextID contextID;
uint8_t rawAssociativity;
bool assignment;
unsigned numHigherThan;
ArrayRef<uint64_t> rawRelations;
decls_block::PrecedenceGroupLayout::readRecord(scratch, nameID, contextID,
rawAssociativity,
assignment, numHigherThan,
rawRelations);
auto DC = getDeclContext(contextID);
auto associativity = getActualAssociativity(rawAssociativity);
if (!associativity.hasValue()) {
error();
return nullptr;
}
if (numHigherThan > rawRelations.size()) {
error();
return nullptr;
}
SmallVector<PrecedenceGroupDecl::Relation, 4> higherThan;
for (auto relID : rawRelations.slice(0, numHigherThan)) {
PrecedenceGroupDecl *rel = nullptr;
if (relID)
rel = dyn_cast_or_null<PrecedenceGroupDecl>(getDecl(relID));
if (!rel) {
error();
return nullptr;
}
higherThan.push_back({SourceLoc(), rel->getName(), rel});
}
SmallVector<PrecedenceGroupDecl::Relation, 4> lowerThan;
for (auto relID : rawRelations.slice(numHigherThan)) {
PrecedenceGroupDecl *rel = nullptr;
if (relID)
rel = dyn_cast_or_null<PrecedenceGroupDecl>(getDecl(relID));
if (!rel) {
error();
return nullptr;
}
lowerThan.push_back({SourceLoc(), rel->getName(), rel});
}
declOrOffset = PrecedenceGroupDecl::create(DC, SourceLoc(), SourceLoc(),
getIdentifier(nameID),
SourceLoc(),
SourceLoc(), SourceLoc(),
*associativity,
SourceLoc(), SourceLoc(),
assignment,
SourceLoc(), higherThan,
SourceLoc(), lowerThan,
SourceLoc());
break;
}
case decls_block::CLASS_DECL: {
IdentifierID nameID;
DeclContextID contextID;
bool isImplicit, isObjC, requiresStoredPropertyInits;
GenericEnvironmentID genericEnvID;
TypeID superclassID;
uint8_t rawAccessLevel;
unsigned numConformances;
ArrayRef<uint64_t> rawInheritedIDs;
decls_block::ClassLayout::readRecord(scratch, nameID, contextID,
isImplicit, isObjC,
requiresStoredPropertyInits,
genericEnvID, superclassID,
rawAccessLevel, numConformances,
rawInheritedIDs);
auto DC = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto genericParams = maybeReadGenericParams(DC);
if (declOrOffset.isComplete())
return declOrOffset;
auto theClass = createDecl<ClassDecl>(SourceLoc(), getIdentifier(nameID),
SourceLoc(), None, genericParams, DC);
declOrOffset = theClass;
configureGenericEnvironment(theClass, genericEnvID);
if (auto accessLevel = getActualAccessibility(rawAccessLevel)) {
theClass->setAccessibility(*accessLevel);
} else {
error();
return nullptr;
}
theClass->setAddedImplicitInitializers();
if (isImplicit)
theClass->setImplicit();
theClass->setSuperclass(getType(superclassID));
if (requiresStoredPropertyInits)
theClass->setRequiresStoredPropertyInits(true);
theClass->computeType();
handleInherited(theClass, rawInheritedIDs);
theClass->setMemberLoader(this, DeclTypeCursor.GetCurrentBitNo());
theClass->setHasDestructor();
skipRecord(DeclTypeCursor, decls_block::MEMBERS);
theClass->setConformanceLoader(
this,
encodeLazyConformanceContextData(numConformances,
DeclTypeCursor.GetCurrentBitNo()));
theClass->setCircularityCheck(CircularityCheck::Checked);
break;
}
case decls_block::ENUM_DECL: {
IdentifierID nameID;
DeclContextID contextID;
bool isImplicit;
GenericEnvironmentID genericEnvID;
TypeID rawTypeID;
uint8_t rawAccessLevel;
unsigned numConformances;
ArrayRef<uint64_t> rawInheritedIDs;
decls_block::EnumLayout::readRecord(scratch, nameID, contextID,
isImplicit, genericEnvID, rawTypeID,
rawAccessLevel,
numConformances, rawInheritedIDs);
auto DC = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto genericParams = maybeReadGenericParams(DC);
if (declOrOffset.isComplete())
return declOrOffset;
auto theEnum = createDecl<EnumDecl>(SourceLoc(), getIdentifier(nameID),
SourceLoc(), None, genericParams, DC);
declOrOffset = theEnum;
configureGenericEnvironment(theEnum, genericEnvID);
if (auto accessLevel = getActualAccessibility(rawAccessLevel)) {
theEnum->setAccessibility(*accessLevel);
} else {
error();
return nullptr;
}
if (isImplicit)
theEnum->setImplicit();
theEnum->setRawType(getType(rawTypeID));
theEnum->computeType();
handleInherited(theEnum, rawInheritedIDs);
theEnum->setMemberLoader(this, DeclTypeCursor.GetCurrentBitNo());
skipRecord(DeclTypeCursor, decls_block::MEMBERS);
theEnum->setConformanceLoader(
this,
encodeLazyConformanceContextData(numConformances,
DeclTypeCursor.GetCurrentBitNo()));
break;
}
case decls_block::ENUM_ELEMENT_DECL: {
IdentifierID nameID;
DeclContextID contextID;
TypeID interfaceTypeID;
bool hasArgumentType;
bool isImplicit; bool isNegative;
unsigned rawValueKindID;
decls_block::EnumElementLayout::readRecord(scratch, nameID,
contextID,
interfaceTypeID,
hasArgumentType,
isImplicit, rawValueKindID,
isNegative);
DeclContext *DC = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto elem = createDecl<EnumElementDecl>(SourceLoc(),
getIdentifier(nameID),
TypeLoc(),
hasArgumentType,
SourceLoc(),
nullptr,
DC);
declOrOffset = elem;
// Deserialize the literal raw value, if any.
switch ((EnumElementRawValueKind)rawValueKindID) {
case EnumElementRawValueKind::None:
break;
case EnumElementRawValueKind::IntegerLiteral: {
auto literalText = getContext().AllocateCopy(blobData);
auto literal = new (getContext()) IntegerLiteralExpr(literalText,
SourceLoc(),
/*implicit*/ true);
if (isNegative)
literal->setNegative(SourceLoc());
elem->setRawValueExpr(literal);
}
}
auto interfaceType = getType(interfaceTypeID);
elem->setInterfaceType(interfaceType);
if (isImplicit)
elem->setImplicit();
elem->setAccessibility(std::max(cast<EnumDecl>(DC)->getFormalAccess(),
Accessibility::Internal));
break;
}
case decls_block::SUBSCRIPT_DECL: {
DeclContextID contextID;
bool isImplicit, isObjC;
GenericEnvironmentID genericEnvID;
TypeID interfaceTypeID;
DeclID getterID, setterID, materializeForSetID;
DeclID addressorID, mutableAddressorID, willSetID, didSetID;
DeclID overriddenID;
uint8_t rawAccessLevel, rawSetterAccessLevel;
uint8_t rawStorageKind;
ArrayRef<uint64_t> argNameIDs;
decls_block::SubscriptLayout::readRecord(scratch, contextID,
isImplicit, isObjC, rawStorageKind,
genericEnvID,
interfaceTypeID,
getterID, setterID,
materializeForSetID,
addressorID, mutableAddressorID,
willSetID, didSetID,
overriddenID, rawAccessLevel,
rawSetterAccessLevel,
argNameIDs);
// Resolve the name ids.
SmallVector<Identifier, 2> argNames;
for (auto argNameID : argNameIDs)
argNames.push_back(getIdentifier(argNameID));
DeclName name(ctx, ctx.Id_subscript, argNames);
Expected<Decl *> overridden = getDeclChecked(overriddenID);
if (!overridden) {
llvm::handleAllErrors(overridden.takeError(),
[](const XRefError &) { /* expected */ },
[this](std::unique_ptr<llvm::ErrorInfoBase> unhandled) {
fatal(std::move(unhandled));
});
return llvm::make_error<OverrideError>(name);
}
auto parent = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto *genericParams = maybeReadGenericParams(parent);
if (declOrOffset.isComplete())
return declOrOffset;
auto subscript = createDecl<SubscriptDecl>(name, SourceLoc(), nullptr,
SourceLoc(), TypeLoc(),
parent, genericParams);
declOrOffset = subscript;
configureGenericEnvironment(subscript, genericEnvID);
subscript->setIndices(readParameterList());
configureStorage(subscript, rawStorageKind,
getterID, setterID, materializeForSetID,
addressorID, mutableAddressorID, willSetID, didSetID);
if (auto accessLevel = getActualAccessibility(rawAccessLevel)) {
subscript->setAccessibility(*accessLevel);
} else {
error();
return nullptr;
}
if (subscript->isSettable()) {
if (auto setterAccess = getActualAccessibility(rawSetterAccessLevel)) {
subscript->setSetterAccessibility(*setterAccess);
} else {
error();
return nullptr;
}
}
auto interfaceType = getType(interfaceTypeID);
subscript->setInterfaceType(interfaceType);
if (isImplicit)
subscript->setImplicit();
if (auto overriddenSub = cast_or_null<SubscriptDecl>(overridden.get())) {
subscript->setOverriddenDecl(overriddenSub);
AddAttribute(new (ctx) OverrideAttr(SourceLoc()));
}
break;
}
case decls_block::EXTENSION_DECL: {
TypeID baseID;
DeclContextID contextID;
bool isImplicit;
GenericEnvironmentID genericEnvID;
unsigned numConformances;
ArrayRef<uint64_t> rawInheritedIDs;
decls_block::ExtensionLayout::readRecord(scratch, baseID, contextID,
isImplicit, genericEnvID,
numConformances, rawInheritedIDs);
auto DC = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto extension = ExtensionDecl::create(ctx, SourceLoc(), TypeLoc(), { },
DC, nullptr);
extension->setEarlyAttrValidation();
declOrOffset = extension;
// Generic parameter lists are written from outermost to innermost.
// Keep reading until we run out of generic parameter lists.
GenericParamList *outerParams = nullptr;
while (auto *genericParams = maybeReadGenericParams(DC, outerParams))
outerParams = genericParams;
extension->setGenericParams(outerParams);
configureGenericEnvironment(extension, genericEnvID);
auto baseTy = getType(baseID);
auto nominal = baseTy->getAnyNominal();
extension->getExtendedTypeLoc().setType(baseTy);
if (isImplicit)
extension->setImplicit();
auto inheritedTypes = ctx.Allocate<TypeLoc>(rawInheritedIDs.size());
for_each(inheritedTypes, rawInheritedIDs,
[this](TypeLoc &tl, uint64_t rawID) {
tl = TypeLoc::withoutLoc(getType(rawID));
});
extension->setInherited(inheritedTypes);
extension->setCheckedInheritanceClause();
extension->setMemberLoader(this, DeclTypeCursor.GetCurrentBitNo());
skipRecord(DeclTypeCursor, decls_block::MEMBERS);
extension->setConformanceLoader(
this,
encodeLazyConformanceContextData(numConformances,
DeclTypeCursor.GetCurrentBitNo()));
nominal->addExtension(extension);
#ifndef NDEBUG
if (outerParams) {
unsigned paramCount = 0;
for (auto *paramList = outerParams;
paramList != nullptr;
paramList = paramList->getOuterParameters()) {
paramCount += paramList->size();
}
assert(paramCount ==
extension->getGenericSignature()->getGenericParams().size());
}
#endif
break;
}
case decls_block::DESTRUCTOR_DECL: {
DeclContextID contextID;
bool isImplicit, isObjC;
GenericEnvironmentID genericEnvID;
TypeID interfaceID;
decls_block::DestructorLayout::readRecord(scratch, contextID,
isImplicit, isObjC,
genericEnvID,
interfaceID);
DeclContext *DC = getDeclContext(contextID);
if (declOrOffset.isComplete())
return declOrOffset;
auto dtor = createDecl<DestructorDecl>(ctx.Id_deinit, SourceLoc(),
/*selfpat*/nullptr, DC);
declOrOffset = dtor;
configureGenericEnvironment(dtor, genericEnvID);
dtor->setAccessibility(std::max(cast<ClassDecl>(DC)->getFormalAccess(),
Accessibility::Internal));
auto *selfParams = readParameterList();
selfParams->get(0)->setImplicit(); // self is implicit.
assert(selfParams && "Didn't get self pattern?");
dtor->setSelfDecl(selfParams->get(0));
auto interfaceType = getType(interfaceID);
dtor->setInterfaceType(interfaceType);
if (isImplicit)
dtor->setImplicit();
break;
}
case decls_block::XREF: {
assert(DAttrs == nullptr);
ModuleID baseModuleID;
uint32_t pathLen;
decls_block::XRefLayout::readRecord(scratch, baseModuleID, pathLen);
auto resolved = resolveCrossReference(getModule(baseModuleID), pathLen);
if (!resolved)
return resolved;
declOrOffset = resolved.get();
break;
}
default:
// We don't know how to deserialize this kind of decl.
error();
return nullptr;
}
// Record the attributes.
if (DAttrs)
declOrOffset.get()->getAttrs().setRawAttributeChain(DAttrs);
auto decl = declOrOffset.get();
decl->setValidationStarted();
return decl;
}
/// Translate from the Serialization function type repr enum values to the AST
/// strongly-typed enum.
///
/// The former is guaranteed to be stable, but may not reflect this version of
/// the AST.
static Optional<swift::FunctionType::Representation>
getActualFunctionTypeRepresentation(uint8_t rep) {
switch (rep) {
#define CASE(THE_CC) \
case (uint8_t)serialization::FunctionTypeRepresentation::THE_CC: \
return swift::FunctionType::Representation::THE_CC;
CASE(Swift)
CASE(Block)
CASE(Thin)
CASE(CFunctionPointer)
#undef CASE
default:
return None;
}
}
/// Translate from the Serialization function type repr enum values to the AST
/// strongly-typed enum.
///
/// The former is guaranteed to be stable, but may not reflect this version of
/// the AST.
static Optional<swift::SILFunctionType::Representation>
getActualSILFunctionTypeRepresentation(uint8_t rep) {
switch (rep) {
#define CASE(THE_CC) \
case (uint8_t)serialization::SILFunctionTypeRepresentation::THE_CC: \
return swift::SILFunctionType::Representation::THE_CC;
CASE(Thick)
CASE(Block)
CASE(Thin)
CASE(CFunctionPointer)
CASE(Method)
CASE(ObjCMethod)
CASE(WitnessMethod)
#undef CASE
default:
return None;
}
}
/// Translate from the serialization Ownership enumerators, which are
/// guaranteed to be stable, to the AST ones.
static
Optional<swift::Ownership> getActualOwnership(serialization::Ownership raw) {
switch (raw) {
case serialization::Ownership::Strong: return swift::Ownership::Strong;
case serialization::Ownership::Unmanaged:return swift::Ownership::Unmanaged;
case serialization::Ownership::Unowned: return swift::Ownership::Unowned;
case serialization::Ownership::Weak: return swift::Ownership::Weak;
}
return None;
}
/// Translate from the serialization ParameterConvention enumerators,
/// which are guaranteed to be stable, to the AST ones.
static
Optional<swift::ParameterConvention> getActualParameterConvention(uint8_t raw) {
switch (serialization::ParameterConvention(raw)) {
#define CASE(ID) \
case serialization::ParameterConvention::ID: \
return swift::ParameterConvention::ID;
CASE(Indirect_In)
CASE(Indirect_Inout)
CASE(Indirect_InoutAliasable)
CASE(Indirect_In_Guaranteed)
CASE(Direct_Owned)
CASE(Direct_Unowned)
CASE(Direct_Guaranteed)
#undef CASE
}
return None;
}
/// Translate from the serialization ResultConvention enumerators,
/// which are guaranteed to be stable, to the AST ones.
static
Optional<swift::ResultConvention> getActualResultConvention(uint8_t raw) {
switch (serialization::ResultConvention(raw)) {
#define CASE(ID) \
case serialization::ResultConvention::ID: return swift::ResultConvention::ID;
CASE(Indirect)
CASE(Owned)
CASE(Unowned)
CASE(UnownedInnerPointer)
CASE(Autoreleased)
#undef CASE
}
return None;
}
Type ModuleFile::getType(TypeID TID) {
Expected<Type> deserialized = getTypeChecked(TID);
if (!deserialized) {
fatal(deserialized.takeError());
}
return deserialized.get();
}
Expected<Type> ModuleFile::getTypeChecked(TypeID TID) {
if (TID == 0)
return Type();
assert(TID <= Types.size() && "invalid type ID");
auto &typeOrOffset = Types[TID-1];
if (typeOrOffset.isComplete())
return typeOrOffset;
BCOffsetRAII restoreOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(typeOrOffset);
auto entry = DeclTypeCursor.advance();
if (entry.Kind != llvm::BitstreamEntry::Record) {
// We don't know how to serialize types represented by sub-blocks.
error();
return nullptr;
}
ASTContext &ctx = getContext();
SmallVector<uint64_t, 64> scratch;
StringRef blobData;
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch, &blobData);
switch (recordID) {
case decls_block::NAME_ALIAS_TYPE: {
DeclID underlyingID;
TypeID canonicalTypeID;
decls_block::NameAliasTypeLayout::readRecord(scratch, underlyingID,
canonicalTypeID);
auto alias = dyn_cast_or_null<TypeAliasDecl>(getDecl(underlyingID));
if (!alias) {
error();
return nullptr;
}
if (ctx.LangOpts.EnableDeserializationRecovery) {
if (Type expectedType = getType(canonicalTypeID)) {
if (!alias->getDeclaredInterfaceType()->isEqual(expectedType)) {
// Fall back to the canonical type.
typeOrOffset = expectedType;
break;
}
}
}
typeOrOffset = alias->getDeclaredInterfaceType();
break;
}
case decls_block::NOMINAL_TYPE: {
DeclID declID;
TypeID parentID;
decls_block::NominalTypeLayout::readRecord(scratch, declID, parentID);
Type parentTy = getType(parentID);
// Record the type as soon as possible. Members of a nominal type often
// try to refer back to the type.
auto nominal = cast<NominalTypeDecl>(getDecl(declID));
typeOrOffset = NominalType::get(nominal, parentTy, ctx);
assert(typeOrOffset.isComplete());
break;
}
case decls_block::PAREN_TYPE: {
TypeID underlyingID;
bool isVariadic, isAutoClosure, isEscaping;
decls_block::ParenTypeLayout::readRecord(scratch, underlyingID, isVariadic,
isAutoClosure, isEscaping);
typeOrOffset = ParenType::get(
ctx, getType(underlyingID),
ParameterTypeFlags(isVariadic, isAutoClosure, isEscaping));
break;
}
case decls_block::TUPLE_TYPE: {
// The tuple record itself is empty. Read all trailing elements.
SmallVector<TupleTypeElt, 8> elements;
while (true) {
auto entry = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
if (entry.Kind != llvm::BitstreamEntry::Record)
break;
scratch.clear();
unsigned recordID = DeclTypeCursor.readRecord(entry.ID, scratch,
&blobData);
if (recordID != decls_block::TUPLE_TYPE_ELT)
break;
IdentifierID nameID;
TypeID typeID;
bool isVariadic, isAutoClosure, isEscaping;
decls_block::TupleTypeEltLayout::readRecord(
scratch, nameID, typeID, isVariadic, isAutoClosure, isEscaping);
elements.emplace_back(
getType(typeID), getIdentifier(nameID),
ParameterTypeFlags(isVariadic, isAutoClosure, isEscaping));
}
typeOrOffset = TupleType::get(elements, ctx);
break;
}
case decls_block::FUNCTION_TYPE: {
TypeID inputID;
TypeID resultID;
uint8_t rawRepresentation;
bool autoClosure, noescape, throws;
decls_block::FunctionTypeLayout::readRecord(scratch, inputID, resultID,
rawRepresentation,
autoClosure,
noescape,
throws);
auto representation = getActualFunctionTypeRepresentation(rawRepresentation);
if (!representation.hasValue()) {
error();
return nullptr;
}
auto Info = FunctionType::ExtInfo(*representation,
autoClosure, noescape,
throws);
typeOrOffset = FunctionType::get(getType(inputID), getType(resultID),
Info);
break;
}
case decls_block::EXISTENTIAL_METATYPE_TYPE: {
TypeID instanceID;
uint8_t repr;
decls_block::ExistentialMetatypeTypeLayout::readRecord(scratch,
instanceID, repr);
switch (repr) {
case serialization::MetatypeRepresentation::MR_None:
typeOrOffset = ExistentialMetatypeType::get(getType(instanceID));
break;
case serialization::MetatypeRepresentation::MR_Thin:
error();
break;
case serialization::MetatypeRepresentation::MR_Thick:
typeOrOffset = ExistentialMetatypeType::get(getType(instanceID),
MetatypeRepresentation::Thick);
break;
case serialization::MetatypeRepresentation::MR_ObjC:
typeOrOffset = ExistentialMetatypeType::get(getType(instanceID),
MetatypeRepresentation::ObjC);
break;
default:
error();
break;
}
break;
}
case decls_block::METATYPE_TYPE: {
TypeID instanceID;
uint8_t repr;
decls_block::MetatypeTypeLayout::readRecord(scratch, instanceID, repr);
switch (repr) {
case serialization::MetatypeRepresentation::MR_None:
typeOrOffset = MetatypeType::get(getType(instanceID));
break;
case serialization::MetatypeRepresentation::MR_Thin:
typeOrOffset = MetatypeType::get(getType(instanceID),
MetatypeRepresentation::Thin);
break;
case serialization::MetatypeRepresentation::MR_Thick:
typeOrOffset = MetatypeType::get(getType(instanceID),
MetatypeRepresentation::Thick);
break;
case serialization::MetatypeRepresentation::MR_ObjC:
typeOrOffset = MetatypeType::get(getType(instanceID),
MetatypeRepresentation::ObjC);
break;
default:
error();
break;
}
break;
}
case decls_block::DYNAMIC_SELF_TYPE: {
TypeID selfID;
decls_block::DynamicSelfTypeLayout::readRecord(scratch, selfID);
typeOrOffset = DynamicSelfType::get(getType(selfID), ctx);
break;
}
case decls_block::LVALUE_TYPE: {
TypeID objectTypeID;
decls_block::LValueTypeLayout::readRecord(scratch, objectTypeID);
typeOrOffset = LValueType::get(getType(objectTypeID));
break;
}
case decls_block::INOUT_TYPE: {
TypeID objectTypeID;
decls_block::LValueTypeLayout::readRecord(scratch, objectTypeID);
typeOrOffset = InOutType::get(getType(objectTypeID));
break;
}
case decls_block::REFERENCE_STORAGE_TYPE: {
uint8_t rawOwnership;
TypeID referentTypeID;
decls_block::ReferenceStorageTypeLayout::readRecord(scratch, rawOwnership,
referentTypeID);
auto ownership =
getActualOwnership((serialization::Ownership) rawOwnership);
if (!ownership.hasValue()) {
error();
break;
}
typeOrOffset = ReferenceStorageType::get(getType(referentTypeID),
ownership.getValue(), ctx);
break;
}
case decls_block::ARCHETYPE_TYPE: {
GenericEnvironmentID envID;
TypeID interfaceTypeID;
decls_block::ArchetypeTypeLayout::readRecord(scratch, envID,
interfaceTypeID);
auto env = getGenericEnvironment(envID);
if (!env) {
error();
break;
}
Type interfaceType = getType(interfaceTypeID);
Type contextType = env->mapTypeIntoContext(interfaceType);
typeOrOffset = contextType;
if (contextType->hasError()) {
error();
break;
}
break;
}
case decls_block::OPENED_EXISTENTIAL_TYPE: {
TypeID existentialID;
decls_block::OpenedExistentialTypeLayout::readRecord(scratch,
existentialID);
typeOrOffset = ArchetypeType::getOpened(getType(existentialID));
break;
}
case decls_block::GENERIC_TYPE_PARAM_TYPE: {
DeclID declIDOrDepth;
unsigned indexPlusOne;
decls_block::GenericTypeParamTypeLayout::readRecord(scratch, declIDOrDepth,
indexPlusOne);
if (indexPlusOne == 0) {
auto genericParam
= dyn_cast_or_null<GenericTypeParamDecl>(getDecl(declIDOrDepth));
if (!genericParam) {
error();
return nullptr;
}
// See if we triggered deserialization through our conformances.
if (typeOrOffset.isComplete())
break;
typeOrOffset = genericParam->getDeclaredInterfaceType();
break;
}
typeOrOffset = GenericTypeParamType::get(declIDOrDepth,indexPlusOne-1,ctx);
break;
}
case decls_block::PROTOCOL_COMPOSITION_TYPE: {
bool hasExplicitAnyObject;
ArrayRef<uint64_t> rawProtocolIDs;
decls_block::ProtocolCompositionTypeLayout::readRecord(scratch,
hasExplicitAnyObject,
rawProtocolIDs);
SmallVector<Type, 4> protocols;
for (TypeID protoID : rawProtocolIDs)
protocols.push_back(getType(protoID));
typeOrOffset = ProtocolCompositionType::get(ctx, protocols,
hasExplicitAnyObject);
break;
}
case decls_block::DEPENDENT_MEMBER_TYPE: {
TypeID baseID;
DeclID assocTypeID;
decls_block::DependentMemberTypeLayout::readRecord(scratch, baseID,
assocTypeID);
typeOrOffset = DependentMemberType::get(
getType(baseID),
cast<AssociatedTypeDecl>(getDecl(assocTypeID)));
break;
}
case decls_block::BOUND_GENERIC_TYPE: {
DeclID declID;
TypeID parentID;
ArrayRef<uint64_t> rawArgumentIDs;
decls_block::BoundGenericTypeLayout::readRecord(scratch, declID, parentID,
rawArgumentIDs);
auto nominal = cast<NominalTypeDecl>(getDecl(declID));
auto parentTy = getType(parentID);
SmallVector<Type, 8> genericArgs;
for (TypeID type : rawArgumentIDs)
genericArgs.push_back(getType(type));
auto boundTy = BoundGenericType::get(nominal, parentTy, genericArgs);
typeOrOffset = boundTy;
break;
}
case decls_block::GENERIC_FUNCTION_TYPE: {
TypeID inputID;
TypeID resultID;
uint8_t rawRep;
bool throws = false;
ArrayRef<uint64_t> genericParamIDs;
decls_block::GenericFunctionTypeLayout::readRecord(scratch,
inputID,
resultID,
rawRep,
throws,
genericParamIDs);
auto rep = getActualFunctionTypeRepresentation(rawRep);
if (!rep.hasValue()) {
error();
return nullptr;
}
// Read the generic parameters.
SmallVector<GenericTypeParamType *, 4> genericParams;
for (auto paramID : genericParamIDs) {
auto param = dyn_cast_or_null<GenericTypeParamType>(
getType(paramID).getPointer());
if (!param) {
error();
break;
}
genericParams.push_back(param);
}
// Read the generic requirements.
SmallVector<Requirement, 4> requirements;
readGenericRequirements(requirements, DeclTypeCursor);
auto info = GenericFunctionType::ExtInfo(*rep, throws);
auto sig = GenericSignature::get(genericParams, requirements);
typeOrOffset = GenericFunctionType::get(sig,
getType(inputID),
getType(resultID),
info);
break;
}
case decls_block::SIL_BLOCK_STORAGE_TYPE: {
TypeID captureID;
decls_block::SILBlockStorageTypeLayout::readRecord(scratch, captureID);
typeOrOffset = SILBlockStorageType::get(getType(captureID)
->getCanonicalType());
break;
}
case decls_block::SIL_BOX_TYPE: {
SILLayoutID layoutID;
decls_block::SILBoxTypeLayout::readRecord(scratch, layoutID);
// Get the layout.
auto getLayout = [&]() -> SILLayout * {
assert(layoutID > 0 && layoutID <= SILLayouts.size()
&& "invalid layout ID");
auto &layoutOrOffset = SILLayouts[layoutID - 1];
if (layoutOrOffset.isComplete()) {
return layoutOrOffset;
}
BCOffsetRAII saveOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(layoutOrOffset);
auto layout = readSILLayout(DeclTypeCursor);
if (!layout) {
error();
return nullptr;
}
layoutOrOffset = layout;
return layout;
};
auto layout = getLayout();
if (!layout)
return nullptr;
SmallVector<Substitution, 4> genericArgs;
if (auto sig = layout->getGenericSignature()) {
for (unsigned i : range(sig->getSubstitutionListSize())) {
(void)i;
auto sub = maybeReadSubstitution(DeclTypeCursor);
if (!sub) {
error();
return nullptr;
}
genericArgs.push_back(
Substitution(sub->getReplacement()->getCanonicalType(),
sub->getConformances()));
}
}
typeOrOffset = SILBoxType::get(getContext(), layout, genericArgs);
break;
}
case decls_block::SIL_FUNCTION_TYPE: {
uint8_t rawCalleeConvention;
uint8_t rawRepresentation;
bool pseudogeneric = false;
bool hasErrorResult;
unsigned numParams;
unsigned numResults;
ArrayRef<uint64_t> variableData;
decls_block::SILFunctionTypeLayout::readRecord(scratch,
rawCalleeConvention,
rawRepresentation,
pseudogeneric,
hasErrorResult,
numParams,
numResults,
variableData);
// Process the ExtInfo.
auto representation
= getActualSILFunctionTypeRepresentation(rawRepresentation);
if (!representation.hasValue()) {
error();
return nullptr;
}
SILFunctionType::ExtInfo extInfo(*representation, pseudogeneric);
// Process the callee convention.
auto calleeConvention = getActualParameterConvention(rawCalleeConvention);
if (!calleeConvention.hasValue()) {
error();
return nullptr;
}
auto processParameter = [&](TypeID typeID, uint64_t rawConvention)
-> Optional<SILParameterInfo> {
auto convention = getActualParameterConvention(rawConvention);
auto type = getType(typeID);
if (!convention || !type) return None;
return SILParameterInfo(type->getCanonicalType(), *convention);
};
auto processResult = [&](TypeID typeID, uint64_t rawConvention)
-> Optional<SILResultInfo> {
auto convention = getActualResultConvention(rawConvention);
auto type = getType(typeID);
if (!convention || !type) return None;
return SILResultInfo(type->getCanonicalType(), *convention);
};
// Bounds check. FIXME: overflow
if (2 * numParams + 2 * numResults + 2 * unsigned(hasErrorResult)
> variableData.size()) {
error();
return nullptr;
}
unsigned nextVariableDataIndex = 0;
// Process the parameters.
SmallVector<SILParameterInfo, 8> allParams;
allParams.reserve(numParams);
for (unsigned i = 0; i != numParams; ++i) {
auto typeID = variableData[nextVariableDataIndex++];
auto rawConvention = variableData[nextVariableDataIndex++];
auto param = processParameter(typeID, rawConvention);
if (!param) {
error();
return nullptr;
}
allParams.push_back(*param);
}
// Process the results.
SmallVector<SILResultInfo, 8> allResults;
allParams.reserve(numResults);
for (unsigned i = 0; i != numResults; ++i) {
auto typeID = variableData[nextVariableDataIndex++];
auto rawConvention = variableData[nextVariableDataIndex++];
auto result = processResult(typeID, rawConvention);
if (!result) {
error();
return nullptr;
}
allResults.push_back(*result);
}
// Process the error result.
Optional<SILResultInfo> errorResult;
if (hasErrorResult) {
auto typeID = variableData[nextVariableDataIndex++];
auto rawConvention = variableData[nextVariableDataIndex++];
errorResult = processResult(typeID, rawConvention);
if (!errorResult) {
error();
return nullptr;
}
}
// Process the generic signature parameters.
SmallVector<GenericTypeParamType *, 8> genericParamTypes;
for (auto id : variableData.slice(nextVariableDataIndex)) {
genericParamTypes.push_back(
cast<GenericTypeParamType>(getType(id)->getCanonicalType()));
}
// Read the generic requirements, if any.
SmallVector<Requirement, 4> requirements;
readGenericRequirements(requirements, DeclTypeCursor);
GenericSignature *genericSig = nullptr;
if (!genericParamTypes.empty() || !requirements.empty())
genericSig = GenericSignature::get(genericParamTypes, requirements,
/*isKnownCanonical=*/true);
typeOrOffset = SILFunctionType::get(genericSig, extInfo,
calleeConvention.getValue(),
allParams, allResults, errorResult,
ctx);
break;
}
case decls_block::ARRAY_SLICE_TYPE: {
TypeID baseID;
decls_block::ArraySliceTypeLayout::readRecord(scratch, baseID);
auto sliceTy = ArraySliceType::get(getType(baseID));
typeOrOffset = sliceTy;
break;
}
case decls_block::DICTIONARY_TYPE: {
TypeID keyID, valueID;
decls_block::DictionaryTypeLayout::readRecord(scratch, keyID, valueID);
auto dictTy = DictionaryType::get(getType(keyID), getType(valueID));
typeOrOffset = dictTy;
break;
}
case decls_block::OPTIONAL_TYPE: {
TypeID baseID;
decls_block::OptionalTypeLayout::readRecord(scratch, baseID);
auto optionalTy = OptionalType::get(getType(baseID));
typeOrOffset = optionalTy;
break;
}
case decls_block::UNCHECKED_OPTIONAL_TYPE: {
TypeID baseID;
decls_block::ImplicitlyUnwrappedOptionalTypeLayout::readRecord(scratch, baseID);
auto optionalTy = ImplicitlyUnwrappedOptionalType::get(getType(baseID));
typeOrOffset = optionalTy;
break;
}
case decls_block::UNBOUND_GENERIC_TYPE: {
DeclID genericID;
TypeID parentID;
decls_block::UnboundGenericTypeLayout::readRecord(scratch,
genericID, parentID);
auto genericDecl = cast<GenericTypeDecl>(getDecl(genericID));
typeOrOffset = UnboundGenericType::get(genericDecl, getType(parentID), ctx);
break;
}
default:
// We don't know how to deserialize this kind of type.
error();
return nullptr;
}
#ifndef NDEBUG
PrettyStackTraceType trace(ctx, "deserializing", typeOrOffset.get());
if (typeOrOffset.get()->hasError()) {
typeOrOffset.get()->dump();
llvm_unreachable("deserialization produced an invalid type "
"(rdar://problem/30382791)");
}
#endif
// Invoke the callback on the deserialized type.
DeserializedTypeCallback(typeOrOffset);
return typeOrOffset;
}
void ModuleFile::loadAllMembers(Decl *D, uint64_t contextData) {
PrettyStackTraceDecl trace("loading members for", D);
++NumMemberListsLoaded;
BCOffsetRAII restoreOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(contextData);
SmallVector<Decl *, 16> members;
bool Err = readMembers(members);
assert(!Err && "unable to read members");
(void)Err;
IterableDeclContext *IDC;
if (auto *nominal = dyn_cast<NominalTypeDecl>(D))
IDC = nominal;
else
IDC = cast<ExtensionDecl>(D);
for (auto member : members)
IDC->addMember(member);
if (auto *proto = dyn_cast<ProtocolDecl>(D)) {
PrettyStackTraceDecl trace("reading default witness table for", D);
bool Err = readDefaultWitnessTable(proto);
assert(!Err && "unable to read default witness table");
(void)Err;
}
}
void
ModuleFile::loadAllConformances(const Decl *D, uint64_t contextData,
SmallVectorImpl<ProtocolConformance*> &conformances) {
PrettyStackTraceDecl trace("loading conformances for", D);
uint64_t numConformances;
uint64_t bitPosition;
std::tie(numConformances, bitPosition)
= decodeLazyConformanceContextData(contextData);
BCOffsetRAII restoreOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(bitPosition);
while (numConformances--) {
auto conf = readConformance(DeclTypeCursor);
if (conf.isConcrete())
conformances.push_back(conf.getConcrete());
}
}
TypeLoc
ModuleFile::loadAssociatedTypeDefault(const swift::AssociatedTypeDecl *ATD,
uint64_t contextData) {
return TypeLoc::withoutLoc(getType(contextData));
}
void ModuleFile::finishNormalConformance(NormalProtocolConformance *conformance,
uint64_t contextData) {
using namespace decls_block;
// Find the conformance record.
BCOffsetRAII restoreOffset(DeclTypeCursor);
DeclTypeCursor.JumpToBit(contextData);
auto entry = DeclTypeCursor.advance();
assert(entry.Kind == llvm::BitstreamEntry::Record &&
"registered lazy loader incorrectly");
DeclID protoID;
DeclContextID contextID;
unsigned valueCount, typeCount;
ArrayRef<uint64_t> rawIDs;
SmallVector<uint64_t, 16> scratch;
unsigned kind = DeclTypeCursor.readRecord(entry.ID, scratch);
(void) kind;
assert(kind == NORMAL_PROTOCOL_CONFORMANCE &&
"registered lazy loader incorrectly");
NormalProtocolConformanceLayout::readRecord(scratch, protoID,
contextID, valueCount,
typeCount,
rawIDs);
// Skip requirement signature conformances.
auto proto = conformance->getProtocol();
for (auto req : proto->getRequirementSignature()->getRequirements()) {
if (req.getKind() == RequirementKind::Conformance) {
(void)readConformance(DeclTypeCursor);
}
}
ArrayRef<uint64_t>::iterator rawIDIter = rawIDs.begin();
while (valueCount--) {
auto req = cast<ValueDecl>(getDecl(*rawIDIter++));
auto witness = cast_or_null<ValueDecl>(getDecl(*rawIDIter++));
assert(witness ||
req->getAttrs().hasAttribute<OptionalAttr>() ||
req->getAttrs().isUnavailable(getContext()));
if (!witness) {
conformance->setWitness(req, Witness());
continue;
}
// Generic signature and environment.
GenericSignature *syntheticSig = nullptr;
GenericEnvironment *syntheticEnv = nullptr;
// Requirement -> synthetic map.
SmallVector<Substitution, 4> reqToSyntheticSubs;
if (unsigned numGenericParams = *rawIDIter++) {
// Generic parameters of the synthetic environment.
SmallVector<GenericTypeParamType *, 2> genericParams;
while (numGenericParams--) {
genericParams.push_back(
getType(*rawIDIter++)->castTo<GenericTypeParamType>());
}
// Generic requirements of the synthetic environment.
SmallVector<Requirement, 4> requirements;
readGenericRequirements(requirements, DeclTypeCursor);
// Form the generic signature for the synthetic environment.
syntheticSig = GenericSignature::get(genericParams, requirements);
// Create the synthetic environment.
syntheticEnv =
syntheticSig->createGenericEnvironment(*getAssociatedModule());
// Requirement -> synthetic substitutions.
if (unsigned numReqSubstitutions = *rawIDIter++) {
while (numReqSubstitutions--) {
auto sub = maybeReadSubstitution(DeclTypeCursor, nullptr);
reqToSyntheticSubs.push_back(*sub);
}
}
}
// Witness substitutions.
SmallVector<Substitution, 4> witnessSubstitutions;
if (unsigned numWitnessSubstitutions = *rawIDIter++) {
while (numWitnessSubstitutions--) {
auto sub = maybeReadSubstitution(DeclTypeCursor, syntheticEnv);
witnessSubstitutions.push_back(*sub);
}
}
// Handle simple witnesses.
if (witnessSubstitutions.empty() && !syntheticSig && !syntheticEnv &&
reqToSyntheticSubs.empty()) {
conformance->setWitness(req, Witness(witness));
continue;
}
// Set the witness.
conformance->setWitness(req, Witness(witness, witnessSubstitutions,
syntheticEnv, reqToSyntheticSubs));
}
assert(rawIDIter <= rawIDs.end() && "read too much");
TypeWitnessMap typeWitnesses;
while (typeCount--) {
// FIXME: We don't actually want to allocate an archetype here; we just
// want to get an access path within the protocol.
auto first = cast<AssociatedTypeDecl>(getDecl(*rawIDIter++));
auto second = getType(*rawIDIter++);
auto third = cast_or_null<TypeDecl>(getDecl(*rawIDIter++));
if (isa<TypeAliasDecl>(third) &&
third->getModuleContext() != getAssociatedModule() &&
!third->getDeclaredInterfaceType()->isEqual(second)) {
// Conservatively drop references to typealiases in other modules
// that may have changed. This may also drop references to typealiases
// that /haven't/ changed but just happen to have generics in them, but
// in practice having a declaration here isn't actually required by the
// rest of the compiler.
third = nullptr;
}
typeWitnesses[first] = std::make_pair(second, third);
}
assert(rawIDIter <= rawIDs.end() && "read too much");
// Set type witnesses.
for (auto typeWitness : typeWitnesses) {
conformance->setTypeWitness(typeWitness.first, typeWitness.second.first,
typeWitness.second.second);
}
}
GenericEnvironment *ModuleFile::loadGenericEnvironment(const DeclContext *decl,
uint64_t contextData) {
return getGenericEnvironment(contextData);
}
static Optional<ForeignErrorConvention::Kind>
decodeRawStableForeignErrorConventionKind(uint8_t kind) {
switch (kind) {
case static_cast<uint8_t>(ForeignErrorConventionKind::ZeroResult):
return ForeignErrorConvention::ZeroResult;
case static_cast<uint8_t>(ForeignErrorConventionKind::NonZeroResult):
return ForeignErrorConvention::NonZeroResult;
case static_cast<uint8_t>(ForeignErrorConventionKind::ZeroPreservedResult):
return ForeignErrorConvention::ZeroPreservedResult;
case static_cast<uint8_t>(ForeignErrorConventionKind::NilResult):
return ForeignErrorConvention::NilResult;
case static_cast<uint8_t>(ForeignErrorConventionKind::NonNilError):
return ForeignErrorConvention::NonNilError;
default:
return None;
}
}
Optional<ForeignErrorConvention> ModuleFile::maybeReadForeignErrorConvention() {
using namespace decls_block;
SmallVector<uint64_t, 8> scratch;
BCOffsetRAII restoreOffset(DeclTypeCursor);
auto next = DeclTypeCursor.advance(AF_DontPopBlockAtEnd);
if (next.Kind != llvm::BitstreamEntry::Record)
return None;
unsigned recKind = DeclTypeCursor.readRecord(next.ID, scratch);
switch (recKind) {
case FOREIGN_ERROR_CONVENTION:
restoreOffset.reset();
break;
default:
return None;
}
uint8_t rawKind;
bool isOwned;
bool isReplaced;
unsigned errorParameterIndex;
TypeID errorParameterTypeID;
TypeID resultTypeID;
ForeignErrorConventionLayout::readRecord(scratch, rawKind,
isOwned, isReplaced,
errorParameterIndex,
errorParameterTypeID,
resultTypeID);
ForeignErrorConvention::Kind kind;
if (auto optKind = decodeRawStableForeignErrorConventionKind(rawKind))
kind = *optKind;
else {
error();
return None;
}
Type errorParameterType = getType(errorParameterTypeID);
CanType canErrorParameterType;
if (errorParameterType)
canErrorParameterType = errorParameterType->getCanonicalType();
Type resultType = getType(resultTypeID);
CanType canResultType;
if (resultType)
canResultType = resultType->getCanonicalType();
auto owned = isOwned ? ForeignErrorConvention::IsOwned
: ForeignErrorConvention::IsNotOwned;
auto replaced = ForeignErrorConvention::IsReplaced_t(isOwned);
switch (kind) {
case ForeignErrorConvention::ZeroResult:
return ForeignErrorConvention::getZeroResult(errorParameterIndex,
owned, replaced,
canErrorParameterType,
canResultType);
case ForeignErrorConvention::NonZeroResult:
return ForeignErrorConvention::getNonZeroResult(errorParameterIndex,
owned, replaced,
canErrorParameterType,
canResultType);
case ForeignErrorConvention::ZeroPreservedResult:
return ForeignErrorConvention::getZeroPreservedResult(errorParameterIndex,
owned, replaced,
canErrorParameterType);
case ForeignErrorConvention::NilResult:
return ForeignErrorConvention::getNilResult(errorParameterIndex,
owned, replaced,
canErrorParameterType);
case ForeignErrorConvention::NonNilError:
return ForeignErrorConvention::getNonNilError(errorParameterIndex,
owned, replaced,
canErrorParameterType);
}
llvm_unreachable("Unhandled ForeignErrorConvention in switch.");
}
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