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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 - 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/AST.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ArchetypeBuilder.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/Initializer.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/Parse/Parser.h"
#include "swift/Serialization/BCReadingExtras.h"
#include "llvm/Support/raw_ostream.h"
using namespace swift;
using namespace swift::serialization;
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 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<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;
}
}
};
private:
ModuleDecl &baseM;
SmallVector<PathPiece, 8> path;
public:
PrettyXRefTrace(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 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";
}
}
};
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";
}
};
} // 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
}
void ModuleFile::finishPendingActions() {
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);
}
Pattern *ModuleFile::maybeReadPattern(DeclContext *owningDC) {
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;
/// 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 = maybeReadPattern(owningDC);
assert(subPattern);
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 = maybeReadPattern(owningDC);
assert(subPattern);
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 var = cast<VarDecl>(getDecl(varID));
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);
Pattern *subPattern = maybeReadPattern(owningDC);
assert(subPattern);
auto result = new (getContext()) TypedPattern(subPattern, 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 = maybeReadPattern(owningDC);
assert(subPattern);
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(getAssociatedModule(),
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(),
ctx.AllocateCopy(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(getAssociatedModule(),
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, inheritedCount;
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,
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 inherited conformances.
InheritedConformanceMap inheritedConformances;
while (inheritedCount--) {
auto inheritedRef = readConformance(DeclTypeCursor);
assert(inheritedRef.isConcrete());
auto inherited = inheritedRef.getConcrete();
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,
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(getAssociatedModule(),
replacementTy);
}
SmallVector<ProtocolConformanceRef, 4> conformanceBuf;
while (numConformances--) {
conformanceBuf.push_back(readConformance(cursor));
}
lastRecordOffset.reset();
return Substitution{replacementTy,
getContext().AllocateCopy(conformanceBuf)};
}
GenericParamList *
ModuleFile::maybeGetOrReadGenericParams(serialization::DeclID genericContextID,
DeclContext *DC) {
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);
}
}
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;
SmallVector<RequirementRepr, 8> requirements;
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::Layout: {
auto subject = getType(rawTypeIDs[0]);
// TODO: Deserialize the layout constraint.
LayoutConstraint layoutConstraint;
requirements.push_back(Requirement(RequirementKind::Layout,
subject, layoutConstraint));
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;
}
default:
// This record is not part of the GenericParamList.
shouldContinue = false;
break;
}
if (!shouldContinue)
break;
}
}
void ModuleFile::configureGenericEnvironment(
llvm::PointerUnion3<GenericTypeDecl *, ExtensionDecl *,
AbstractFunctionDecl *> 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 *>()) {
if (auto type = genericDecl.dyn_cast<GenericTypeDecl *>()) {
type->setLazyGenericEnvironment(this, genericSig, envID);
DelayedGenericEnvironments.push_back(type);
} else if (auto func = genericDecl.dyn_cast<AbstractFunctionDecl *>()) {
func->setLazyGenericEnvironment(this, genericSig, envID);
DelayedGenericEnvironments.push_back(func);
} else {
auto ext = genericDecl.get<ExtensionDecl *>();
ext->setLazyGenericEnvironment(this, genericSig, envID);
DelayedGenericEnvironments.push_back(ext);
}
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 *>()) {
if (auto type = genericDecl.dyn_cast<GenericTypeDecl *>()) {
type->setGenericEnvironment(genericEnv);
} else if (auto func = genericDecl.dyn_cast<AbstractFunctionDecl *>()) {
func->setGenericEnvironment(genericEnv);
} else {
auto ext = genericDecl.get<ExtensionDecl *>();
ext->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);