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Deserialization.cpp
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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 - 2015 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/Serialization/ModuleFile.h"
#include "swift/Serialization/ModuleFormat.h"
#include "swift/AST/AST.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/Serialization/BCReadingExtras.h"
#include "llvm/Support/raw_ostream.h"
using namespace swift;
using namespace swift::serialization;
using ConformancePair = std::pair<ProtocolDecl *, ProtocolConformance *>;
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::Serialized<Decl*> &DeclOrOffset;
DeclID ID;
decls_block::RecordKind Kind;
public:
PrettyDeclDeserialization(const ModuleFile::Serialized<Decl*> &declOrOffset,
DeclID DID, decls_block::RecordKind kind)
: 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"
}
}
virtual void print(raw_ostream &os) const override {
if (!DeclOrOffset.isComplete()) {
os << "While deserializing decl #" << ID << " ("
<< getRecordKindString(Kind) << ")\n";
return;
}
os << "While deserializing ";
if (auto VD = dyn_cast<ValueDecl>(DeclOrOffset.get())) {
os << "'" << VD->getName() << "' (" << IDAndKind{VD, ID} << ") \n";
} else if (auto ED = dyn_cast<ExtensionDecl>(DeclOrOffset.get())) {
os << "extension of '" << ED->getExtendedType() << "' ("
<< IDAndKind{ED, ID} << ") \n";
} else {
os << IDAndKind{DeclOrOffset.get(), ID} << "\n";
}
}
};
class PrettyXRefTrace : public llvm::PrettyStackTraceEntry {
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<Module *>())
os << "in an extension in module '" << getDataAs<Module *>()->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;
}
}
};
private:
Module &baseM;
SmallVector<PathPiece, 8> path;
public:
PrettyXRefTrace(Module &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(Module *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 });
}
virtual void print(raw_ostream &os) const override {
os << "Cross-reference to module '" << baseM.getName() << "'\n";
for (auto &piece : path) {
os << "\t... ";
piece.print(os);
os << "\n";
}
}
};
} // 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 bool skipRecord(llvm::BitstreamCursor &cursor, unsigned recordKind) {
auto next = cursor.advance(AF_DontPopBlockAtEnd);
if (next.Kind != llvm::BitstreamEntry::Record)
return false;
SmallVector<uint64_t, 64> scratch;
StringRef blobData;
#if NDEBUG
cursor.skipRecord(next.ID);
return true;
#else
unsigned kind = cursor.readRecord(next.ID, scratch, &blobData);
return kind == recordKind;
#endif
}
/// 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;
}
return None;
}
Pattern *ModuleFile::maybeReadPattern() {
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 nullptr;
unsigned kind = DeclTypeCursor.readRecord(next.ID, scratch);
switch (kind) {
case decls_block::PAREN_PATTERN: {
bool isImplicit;
ParenPatternLayout::readRecord(scratch, isImplicit);
Pattern *subPattern = maybeReadPattern();
assert(subPattern);
auto result = new (getContext()) ParenPattern(SourceLoc(),
subPattern,
SourceLoc(),
isImplicit);
result->setType(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;
uint8_t rawDefaultArg;
bool hasEllipsis;
TuplePatternEltLayout::readRecord(scratch, labelID, hasEllipsis,
rawDefaultArg);
Identifier label = getIdentifier(labelID);
Pattern *subPattern = maybeReadPattern();
assert(subPattern);
// Decode the default argument kind.
// FIXME: Default argument expression, if available.
swift::DefaultArgumentKind defaultArgKind
= swift::DefaultArgumentKind::None;
if (auto defaultArg = getActualDefaultArgKind(rawDefaultArg))
defaultArgKind = *defaultArg;
elements.push_back(TuplePatternElt(label, SourceLoc(), subPattern,
hasEllipsis, SourceLoc(),
nullptr, defaultArgKind));
}
auto result = TuplePattern::create(getContext(), SourceLoc(),
elements, SourceLoc(), isImplicit);
result->setType(getType(tupleTypeID));
restoreOffset.reset();
return result;
}
case decls_block::NAMED_PATTERN: {
DeclID varID;
bool isImplicit;
NamedPatternLayout::readRecord(scratch, varID, isImplicit);
auto var = cast<VarDecl>(getDecl(varID));
auto result = new (getContext()) NamedPattern(var, isImplicit);
if (var->hasType())
result->setType(var->getType());
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);
result->setType(getType(typeID));
restoreOffset.reset();
return result;
}
case decls_block::TYPED_PATTERN: {
TypeID typeID;
bool isImplicit;
TypedPatternLayout::readRecord(scratch, typeID, isImplicit);
Pattern *subPattern = maybeReadPattern();
assert(subPattern);
TypeLoc typeInfo = TypeLoc::withoutLoc(getType(typeID));
auto result = new (getContext()) TypedPattern(subPattern, typeInfo,
isImplicit);
result->setType(typeInfo.getType());
restoreOffset.reset();
return result;
}
case decls_block::VAR_PATTERN: {
bool isImplicit, isLet;
VarPatternLayout::readRecord(scratch, isLet, isImplicit);
Pattern *subPattern = maybeReadPattern();
assert(subPattern);
auto result = new (getContext()) VarPattern(SourceLoc(), isLet, subPattern,
isImplicit);
result->setType(subPattern->getType());
restoreOffset.reset();
return result;
}
default:
return nullptr;
}
}
ProtocolConformance *ModuleFile::readConformance(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 NO_CONFORMANCE: {
// Nothing to read.
return nullptr;
}
case SPECIALIZED_PROTOCOL_CONFORMANCE: {
TypeID conformingTypeID;
unsigned numSubstitutions;
SpecializedProtocolConformanceLayout::readRecord(scratch, conformingTypeID,
numSubstitutions);
ASTContext &ctx = getContext();
Type conformingType = getType(conformingTypeID);
// Read the substitutions.
SmallVector<Substitution, 4> substitutions;
while (numSubstitutions--) {
auto sub = maybeReadSubstitution(Cursor);
assert(sub.hasValue() && "Missing substitution?");
substitutions.push_back(*sub);
}
ProtocolConformance *genericConformance = readConformance(Cursor);
assert(genericConformance && "Missing generic conformance?");
return ctx.getSpecializedConformance(conformingType, genericConformance,
ctx.AllocateCopy(substitutions));
}
case INHERITED_PROTOCOL_CONFORMANCE: {
TypeID conformingTypeID;
InheritedProtocolConformanceLayout::readRecord(scratch, conformingTypeID);
ASTContext &ctx = getContext();
Type conformingType = getType(conformingTypeID);
ProtocolConformance *inheritedConformance = readConformance(Cursor);
assert(inheritedConformance && "Missing generic conformance?");
return ctx.getInheritedConformance(conformingType, inheritedConformance);
}
case NORMAL_PROTOCOL_CONFORMANCE_ID: {
NormalConformanceID conformanceID;
NormalProtocolConformanceIdLayout::readRecord(scratch, conformanceID);
return readNormalConformance(conformanceID);
}
case PROTOCOL_CONFORMANCE_XREF: {
DeclID protoID;
DeclID nominalID;
ModuleID moduleID;
ProtocolConformanceXrefLayout::readRecord(scratch, protoID, nominalID,
moduleID);
auto proto = cast<ProtocolDecl>(getDecl(protoID));
auto nominal = cast<NominalTypeDecl>(getDecl(nominalID));
auto module = getModule(moduleID);
SmallVector<ProtocolConformance *, 2> conformances;
nominal->lookupConformance(module, proto,
conformances);
assert(!conformances.empty() && "Could not find conformance");
return conformances.front();
}
// Not a protocol conformance.
default:
error();
return nullptr;
}
}
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, inheritedCount, defaultedCount;
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, inheritedCount,
defaultedCount, rawIDs);
auto proto = cast<ProtocolDecl>(getDecl(protoID));
ASTContext &ctx = getContext();
DeclContext *dc = getDeclContext(contextID);
Type conformingType = dc->getDeclaredTypeInContext();
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->isNominalTypeOrNominalTypeExtensionContext()
->registerProtocolConformance(conformance);
// Read inherited conformances.
InheritedConformanceMap inheritedConformances;
while (inheritedCount--) {
auto inherited = readConformance(DeclTypeCursor);
assert(inherited);
inheritedConformances[inherited->getProtocol()] = inherited;
}
// If the conformance is complete, we're done.
if (conformance->isComplete())
return conformance;
// Record the inherited conformance.
if (conformance->getInheritedConformances().empty())
for (auto inherited : inheritedConformances)
conformance->setInheritedConformance(inherited.first, inherited.second);
conformance->setState(ProtocolConformanceState::Complete);
conformance->setLazyLoader(this, offset);
return conformance;
}
Optional<Substitution>
ModuleFile::maybeReadSubstitution(llvm::BitstreamCursor &cursor) {
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 archetypeID, replacementID;
unsigned numConformances;
decls_block::BoundGenericSubstitutionLayout::readRecord(scratch,
archetypeID,
replacementID,
numConformances);
auto archetypeTy = getType(archetypeID)->castTo<ArchetypeType>();
auto replacementTy = getType(replacementID);
SmallVector<ProtocolConformance *, 4> conformanceBuf;
while (numConformances--) {
conformanceBuf.push_back(readConformance(cursor));
}
lastRecordOffset.reset();
return Substitution{archetypeTy, replacementTy,
getContext().AllocateCopy(conformanceBuf)};
}
GenericParamList *
ModuleFile::maybeGetOrReadGenericParams(serialization::DeclID genericContextID,
DeclContext *DC,
llvm::BitstreamCursor &Cursor) {
if (genericContextID) {
Decl *genericContext = getDecl(genericContextID);
assert(genericContext && "loading PolymorphicFunctionType before its decl");
if (auto fn = dyn_cast<AbstractFunctionDecl>(genericContext))
return fn->getGenericParams();
if (auto nominal = dyn_cast<NominalTypeDecl>(genericContext))
return nominal->getGenericParams();
if (auto ext = dyn_cast<ExtensionDecl>(genericContext))
return ext->getGenericParams();
llvm_unreachable("only functions and nominals can provide generic params");
} else {
return maybeReadGenericParams(DC, Cursor);
}
}
GenericParamList *ModuleFile::maybeReadGenericParams(DeclContext *DC,
llvm::BitstreamCursor &Cursor,
GenericParamList *outerParams) {
using namespace decls_block;
assert(DC && "need a context for the decls in the list");
BCOffsetRAII lastRecordOffset(Cursor);
SmallVector<uint64_t, 8> scratch;
StringRef blobData;
auto next = Cursor.advance(AF_DontPopBlockAtEnd);
if (next.Kind != llvm::BitstreamEntry::Record)
return nullptr;
// Read the raw archetype IDs into a different scratch buffer
// because we need to keep this alive for longer.
SmallVector<uint64_t, 4> rawArchetypeIDsBuffer;
unsigned kind = Cursor.readRecord(next.ID, rawArchetypeIDsBuffer, &blobData);
if (kind != GENERIC_PARAM_LIST)
return nullptr;
// Read in the raw-archetypes buffer, but don't try to consume it yet.
ArrayRef<uint64_t> rawArchetypeIDs;
GenericParamListLayout::readRecord(rawArchetypeIDsBuffer, rawArchetypeIDs);
SmallVector<GenericTypeParamDecl *, 8> params;
SmallVector<RequirementRepr, 8> requirements;
SmallVector<ArchetypeType *, 8> archetypes;
// The GenericTypeParamDecls might be from a different module file.
// If so, we need to map the archetype IDs from the serialized
// all-archetypes list in this module file over to the corresponding
// archetypes from the original generic parameter decls, or else
// we'll end up constructing fresh archetypes that don't match the
// ones from the generic parameters.
// We have to do this mapping before we might call getType on one of
// those archetypes, but after we've read all the generic parameters.
// Therefore we do it lazily.
bool haveMappedArchetypes = false;
auto mapArchetypes = [&] {
if (haveMappedArchetypes) return;
GenericParamList::deriveAllArchetypes(params, archetypes);
assert(rawArchetypeIDs.size() == archetypes.size());
for (unsigned index : indices(rawArchetypeIDs)) {
TypeID TID = rawArchetypeIDs[index];
auto &typeOrOffset = Types[TID-1];
if (typeOrOffset.isComplete()) {
// FIXME: this assertion is absolutely correct, but it's
// currently fouled up by the presence of archetypes in
// substitutions. Those *should* be irrelevant for all the
// cases where this is wrong, but...
//assert(typeOrOffset.get().getPointer() == archetypes[index] &&
// "already deserialized this archetype to a different type!");
// TODO: remove unsafeOverwrite when this hack goes away
typeOrOffset.unsafeOverwrite(archetypes[index]);
} else {
typeOrOffset = archetypes[index];
}
}
haveMappedArchetypes = true;
};
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_PARAM: {
assert(!haveMappedArchetypes &&
"generic parameters interleaved with requirements?");
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;
}
case GENERIC_REQUIREMENT: {
uint8_t rawKind;
uint64_t rawTypeIDs[2];
GenericRequirementLayout::readRecord(scratch, rawKind,
rawTypeIDs[0], rawTypeIDs[1]);
mapArchetypes();
switch (rawKind) {
case GenericRequirementKind::Conformance: {
auto subject = TypeLoc::withoutLoc(getType(rawTypeIDs[0]));
auto constraint = TypeLoc::withoutLoc(getType(rawTypeIDs[1]));
requirements.push_back(RequirementRepr::getConformance(subject,
SourceLoc(),
constraint));
break;
}
case GenericRequirementKind::SameType: {
auto first = TypeLoc::withoutLoc(getType(rawTypeIDs[0]));
auto second = TypeLoc::withoutLoc(getType(rawTypeIDs[1]));
requirements.push_back(RequirementRepr::getSameType(first,
SourceLoc(),
second));
break;
}
case WitnessMarker: {
// Shouldn't happen where we have requirement representations.
error();
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();
}
requirements.back().setAsWrittenString(blobData);
break;
}
case LAST_GENERIC_REQUIREMENT:
// Read the end-of-requirements record.
uint8_t dummy;
LastGenericRequirementLayout::readRecord(scratch, dummy);
lastRecordOffset.reset();
shouldContinue = false;
break;
default:
// This record is not part of the GenericParamList.
shouldContinue = false;
break;
}
if (!shouldContinue)
break;
}
// Make sure we map the archetypes if we haven't yet.
mapArchetypes();
auto paramList = GenericParamList::create(getContext(), SourceLoc(),
params, SourceLoc(), requirements,
SourceLoc());
paramList->setAllArchetypes(getContext().AllocateCopy(archetypes));
paramList->setOuterParameters(outerParams ? outerParams :
DC->getGenericParamsOfContext());
return paramList;
}
void ModuleFile::readGenericRequirements(
SmallVectorImpl<Requirement> &requirements) {
using namespace decls_block;
BCOffsetRAII lastRecordOffset(DeclTypeCursor);
SmallVector<uint64_t, 8> scratch;
StringRef blobData;
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_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::SameType: {
auto first = getType(rawTypeIDs[0]);
auto second = getType(rawTypeIDs[1]);
requirements.push_back(Requirement(RequirementKind::SameType,
first, second));
break;
}
case GenericRequirementKind::WitnessMarker: {
auto first = getType(rawTypeIDs[0]);
requirements.push_back(Requirement(RequirementKind::WitnessMarker,
first, Type()));
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;
}
default:
// This record is not part of the GenericParamList.
shouldContinue = false;
break;
}
if (!shouldContinue)
break;
}
}
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) {
Decl *D = getDecl(rawID);
assert(D && "unable to deserialize next member");
Members.push_back(D);
}
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, Module *expectedModule,
CanGenericSignature expectedGenericSig, bool isType,
bool inProtocolExt,
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->hasType())
return true;
if (canTy && value->getInterfaceType()->getCanonicalType() != canTy)
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'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()->isProtocolOrProtocolExtensionContext() &&
(bool)value->getDeclContext()->isProtocolExtensionContext()
!= 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());
}
Decl *ModuleFile::resolveCrossReference(Module *M, uint32_t pathLen) {
using namespace decls_block;
assert(M && "missing dependency");
PrettyXRefTrace pathTrace(*M);
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 onlyInNominal = false;
bool inProtocolExt = false;
if (isType)
XRefTypePathPieceLayout::readRecord(scratch, IID, onlyInNominal);
else
XRefValuePathPieceLayout::readRecord(scratch, TID, IID, inProtocolExt);
Identifier name = getIdentifier(IID);
pathTrace.addValue(name);
Type filterTy = getType(TID);
if (!isType)