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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 - 2020 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 "BCReadingExtras.h"
#include "DeserializationErrors.h"
#include "ModuleFile.h"
#include "ModuleFormat.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/Attr.h"
#include "swift/AST/AttrKind.h"
#include "swift/AST/AutoDiff.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/DistributedDecl.h"
#include "swift/AST/Expr.h"
#include "swift/AST/ForeignAsyncConvention.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/Initializer.h"
#include "swift/AST/MacroDefinition.h"
#include "swift/AST/NameLookupRequests.h"
#include "swift/AST/PackConformance.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/AST/PropertyWrappers.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/Basic/Assertions.h"
#include "swift/Basic/Defer.h"
#include "swift/Basic/Statistic.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/ClangImporter/ClangModule.h"
#include "swift/ClangImporter/SwiftAbstractBasicReader.h"
#include "swift/Serialization/SerializedModuleLoader.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/Attr.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/AttributeCommonInfo.h"
#include "clang/Index/USRGeneration.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/raw_ostream.h"
#define DEBUG_TYPE "Serialization"
// Unwrap an Expected<> variable following the typical deserialization pattern:
// - On a value, assign it to Output.
// - On an error, return it to bubble it up to the caller.
#define UNWRAP(Input, Output) { \
auto ValueOrError = Input; \
if (!ValueOrError) \
return ValueOrError.takeError(); \
Output = ValueOrError.get(); \
}
STATISTIC(NumDeclsLoaded, "# of decls deserialized");
STATISTIC(NumMemberListsLoaded,
"# of nominals/extensions whose members were loaded");
STATISTIC(NumNormalProtocolConformancesLoaded,
"# of normal protocol conformances deserialized");
STATISTIC(NumNormalProtocolConformancesCompleted,
"# of normal protocol conformances completed");
STATISTIC(NumNestedTypeShortcuts,
"# of nested types resolved without full lookup");
using namespace swift;
using namespace swift::serialization;
using llvm::Expected;
namespace {
struct DeclAndOffset {
const Decl *D;
uint64_t offset;
};
static raw_ostream &operator<<(raw_ostream &os, DeclAndOffset &&pair) {
return os << Decl::getKindName(pair.D->getKind())
<< "Decl @ " << pair.offset;
}
class PrettyDeclDeserialization : public llvm::PrettyStackTraceEntry {
const ModuleFile *MF;
const ModuleFile::Serialized<Decl*> &DeclOrOffset;
uint64_t offset;
decls_block::RecordKind Kind;
public:
PrettyDeclDeserialization(ModuleFile *module,
const ModuleFile::Serialized<Decl*> &declOrOffset,
decls_block::RecordKind kind)
: MF(module), DeclOrOffset(declOrOffset), offset(declOrOffset),
Kind(kind) {
}
static const char *getRecordKindString(decls_block::RecordKind Kind) {
switch (Kind) {
#define RECORD(Id) case decls_block::Id: return #Id;
#include "DeclTypeRecordNodes.def"
}
llvm_unreachable("Unhandled RecordKind in switch.");
}
void print(raw_ostream &os) const override {
if (!DeclOrOffset.isComplete()) {
os << "While deserializing decl @ " << offset << " ("
<< getRecordKindString(Kind) << ")";
} else {
os << "While deserializing ";
if (auto VD = dyn_cast<ValueDecl>(DeclOrOffset.get())) {
os << "'" << VD->getBaseName() << "' (" << DeclAndOffset{VD, offset}
<< ")";
} else if (auto ED = dyn_cast<ExtensionDecl>(DeclOrOffset.get())) {
os << "extension of '" << ED->getExtendedType() << "' ("
<< DeclAndOffset{ED, offset} << ")";
} else {
os << DeclAndOffset{DeclOrOffset.get(), offset};
}
}
os << " in '" << MF->getName() << "'\n";
}
};
class PrettySupplementalDeclNameTrace : public llvm::PrettyStackTraceEntry {
DeclName name;
public:
PrettySupplementalDeclNameTrace(DeclName name)
: name(name) { }
void print(raw_ostream &os) const override {
os << " ...decl is named '" << name << "'\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");
}
};
} // end anonymous namespace
const char DeclDeserializationError::ID = '\0';
void DeclDeserializationError::anchor() {}
const char XRefError::ID = '\0';
void XRefError::anchor() {}
const char XRefNonLoadedModuleError::ID = '\0';
void XRefNonLoadedModuleError::anchor() {}
const char OverrideError::ID = '\0';
void OverrideError::anchor() {}
const char TypeError::ID = '\0';
void TypeError::anchor() {}
const char ExtensionError::ID = '\0';
void ExtensionError::anchor() {}
const char DeclAttributesDidNotMatch::ID = '\0';
void DeclAttributesDidNotMatch::anchor() {}
const char InvalidRecordKindError::ID = '\0';
void InvalidRecordKindError::anchor() {}
const char UnsafeDeserializationError::ID = '\0';
void UnsafeDeserializationError::anchor() {}
const char ModularizationError::ID = '\0';
void ModularizationError::anchor() {}
const char InvalidEnumValueError::ID = '\0';
void InvalidEnumValueError::anchor() {}
/// Skips a single record in the bitstream.
///
/// Destroys the stream position if the next entry is not a record.
static void skipRecord(llvm::BitstreamCursor &cursor, unsigned recordKind) {
auto next = llvm::cantFail<llvm::BitstreamEntry>(
cursor.advance(AF_DontPopBlockAtEnd));
assert(next.Kind == llvm::BitstreamEntry::Record);
unsigned kind = llvm::cantFail<unsigned>(cursor.skipRecord(next.ID));
assert(kind == recordKind);
(void)kind;
}
char FatalDeserializationError::ID;
void ModuleFile::fatal(llvm::Error error) const {
Core->fatal(diagnoseFatal(std::move(error)));
}
SourceLoc ModuleFile::getSourceLoc() const {
auto &SourceMgr = getContext().Diags.SourceMgr;
auto filename = getModuleFilename();
auto bufferID = SourceMgr.getIDForBufferIdentifier(filename);
if (!bufferID)
bufferID = SourceMgr.addMemBufferCopy("<binary format>", filename);
return SourceMgr.getLocForBufferStart(*bufferID);
}
SourceLoc ModularizationError::getSourceLoc() const {
auto &SourceMgr = referenceModule->getContext().Diags.SourceMgr;
auto filename = referenceModule->getModuleFilename();
// Synthesize some context. We don't have an actual decl here
// so try to print a simple representation of the reference.
std::string S;
llvm::raw_string_ostream OS(S);
OS << expectedModule->getName() << "." << name;
// If we enable these remarks by default we may want to reuse these buffers.
auto bufferID = SourceMgr.addMemBufferCopy(S, filename);
return SourceMgr.getLocForBufferStart(bufferID);
}
void
ModularizationError::diagnose(const ModuleFile *MF,
DiagnosticBehavior limit) const {
auto &ctx = MF->getContext();
auto loc = getSourceLoc();
auto diagnoseError = [&](Kind errorKind) {
switch (errorKind) {
case Kind::DeclMoved:
return ctx.Diags.diagnose(loc,
diag::modularization_issue_decl_moved,
declIsType, name, expectedModule,
foundModule);
case Kind::DeclKindChanged:
return
ctx.Diags.diagnose(loc,
diag::modularization_issue_decl_type_changed,
declIsType, name, expectedModule,
referenceModule->getName(), foundModule,
foundModule != expectedModule);
case Kind::DeclNotFound:
return ctx.Diags.diagnose(loc,
diag::modularization_issue_decl_not_found,
declIsType, name, expectedModule);
}
llvm_unreachable("Unhandled ModularizationError::Kind in switch.");
};
auto inFlight = diagnoseError(errorKind);
inFlight.limitBehavior(limit);
inFlight.flush();
// We could pass along the `path` information through notes.
// However, for a top-level decl a path would just duplicate the
// expected module name and the decl name from the diagnostic.
// Show context with relevant file paths.
ctx.Diags.diagnose(loc,
diag::modularization_issue_note_expected,
declIsType, expectedModule,
expectedModule->getModuleSourceFilename());
const clang::Module *expectedUnderlying =
expectedModule->findUnderlyingClangModule();
if (!expectedModule->isNonSwiftModule() &&
expectedUnderlying) {
auto CML = ctx.getClangModuleLoader();
auto &CSM = CML->getClangASTContext().getSourceManager();
StringRef filename = CSM.getFilename(expectedUnderlying->DefinitionLoc);
ctx.Diags.diagnose(loc,
diag::modularization_issue_note_expected_underlying,
expectedUnderlying->Name,
filename);
}
if (foundModule)
ctx.Diags.diagnose(loc,
diag::modularization_issue_note_found,
declIsType, foundModule,
foundModule->getModuleSourceFilename());
if (mismatchingTypes.has_value()) {
ctx.Diags.diagnose(loc,
diag::modularization_issue_type_mismatch,
mismatchingTypes->first, mismatchingTypes->second);
}
// A Swift language version mismatch could lead to a different set of rules
// from APINotes files being applied when building the module vs when reading
// from it.
version::Version
moduleLangVersion = referenceModule->getCompatibilityVersion(),
clientLangVersion = MF->getContext().LangOpts.EffectiveLanguageVersion;
ModuleDecl *referenceModuleDecl = referenceModule->getAssociatedModule();
if (clientLangVersion != moduleLangVersion) {
ctx.Diags.diagnose(loc,
diag::modularization_issue_swift_version,
referenceModuleDecl, moduleLangVersion,
clientLangVersion);
}
// If the error is in a resilient swiftmodule adjacent to a swiftinterface,
// deleting the module to rebuild from the swiftinterface may fix the issue.
// Limit this suggestion to distributed Swift modules to not hint at
// deleting local caches and such.
bool referenceModuleIsDistributed = referenceModuleDecl &&
referenceModuleDecl->isNonUserModule();
if (referenceModule->getResilienceStrategy() ==
ResilienceStrategy::Resilient &&
referenceModuleIsDistributed) {
ctx.Diags.diagnose(loc,
diag::modularization_issue_stale_module,
referenceModuleDecl,
referenceModule->getModuleFilename());
}
// If the missing decl was expected to be in a clang module,
// it may be hidden by some clang defined passed via `-Xcc` affecting how
// headers are seen.
if (expectedUnderlying) {
ctx.Diags.diagnose(loc,
diag::modularization_issue_audit_headers,
expectedModule->isNonSwiftModule(), expectedModule);
}
// If the reference goes from a distributed module to a local module,
// the compiler may have picked up an undesired module. We usually expect
// distributed modules to only reference other distributed modules.
// Local modules can reference both local modules and distributed modules.
if (referenceModuleIsDistributed) {
if (!expectedModule->isNonUserModule()) {
ctx.Diags.diagnose(loc,
diag::modularization_issue_layering_expected_local,
referenceModuleDecl, expectedModule);
} else if (foundModule && !foundModule->isNonUserModule()) {
ctx.Diags.diagnose(loc,
diag::modularization_issue_layering_found_local,
referenceModuleDecl, foundModule);
}
}
// If a type moved between MyModule and MyModule_Private, it can be caused
// by the use of `-Xcc -D` to change the API of the modules, leading to
// decls moving between both modules.
if (errorKind == Kind::DeclMoved ||
errorKind == Kind::DeclKindChanged) {
StringRef foundModuleName = foundModule->getName().str();
StringRef expectedModuleName = expectedModule->getName().str();
if (foundModuleName != expectedModuleName &&
(foundModuleName.starts_with(expectedModuleName) ||
expectedModuleName.starts_with(foundModuleName)) &&
(expectedUnderlying ||
expectedModule->findUnderlyingClangModule())) {
ctx.Diags.diagnose(loc,
diag::modularization_issue_related_modules,
declIsType, name);
}
}
ctx.Diags.flushConsumers();
}
void TypeError::diagnose(const ModuleFile *MF) const {
MF->getContext().Diags.diagnose(MF->getSourceLoc(),
diag::modularization_issue_side_effect_type_error,
name);
}
void ExtensionError::diagnose(const ModuleFile *MF) const {
MF->getContext().Diags.diagnose(MF->getSourceLoc(),
diag::modularization_issue_side_effect_extension_error);
}
llvm::Error
ModuleFile::diagnoseModularizationError(llvm::Error error,
DiagnosticBehavior limit) const {
auto handleModularizationError =
[&](const ModularizationError &modularError) -> llvm::Error {
modularError.diagnose(this, limit);
return llvm::Error::success();
};
llvm::Error outError = llvm::handleErrors(std::move(error),
handleModularizationError,
[&](TypeError &typeError) -> llvm::Error {
if (typeError.diagnoseUnderlyingReason(handleModularizationError)) {
typeError.diagnose(this);
return llvm::Error::success();
}
return llvm::make_error<TypeError>(std::move(typeError));
},
[&](ExtensionError &extError) -> llvm::Error {
if (extError.diagnoseUnderlyingReason(handleModularizationError)) {
extError.diagnose(this);
return llvm::Error::success();
}
return llvm::make_error<ExtensionError>(std::move(extError));
});
return outError;
}
llvm::Error ModuleFile::diagnoseFatal(llvm::Error error) const {
auto &ctx = getContext();
if (FileContext) {
if (ctx.LangOpts.EnableDeserializationRecovery) {
error = diagnoseModularizationError(std::move(error));
// If no error is left, it was reported as a diagnostic. There's no
// need to crash.
if (!error)
return llvm::Error::success();
}
// General deserialization failure message.
ctx.Diags.diagnose(getSourceLoc(), diag::serialization_fatal, Core->Name);
}
// Unless in the debugger, crash. ModuleFileSharedCore::fatal() calls abort().
// This allows aggregation of crash logs for compiler development, but in a
// long-running process like LLDB this is undesirable. Only abort() if not in
// the debugger.
if (!ctx.LangOpts.DebuggerSupport)
Core->fatal(std::move(error));
// Otherwise, augment the error with contextual information at this point
// of failure and pass it back to be reported later.
std::string msg;
{
llvm::raw_string_ostream os(msg);
Core->outputDiagnosticInfo(os);
os << '\n';
llvm::sys::PrintStackTrace(os, 128);
}
msg += ": " + toString(std::move(error));
return llvm::make_error<FatalDeserializationError>(msg);
}
void ModuleFile::outputDiagnosticInfo(llvm::raw_ostream &os) const {
Core->outputDiagnosticInfo(os);
}
static std::optional<swift::AccessorKind> getActualAccessorKind(uint8_t raw) {
switch (serialization::AccessorKind(raw)) {
#define ACCESSOR(ID) \
case serialization::AccessorKind::ID: return swift::AccessorKind::ID;
#include "swift/AST/AccessorKinds.def"
}
return std::nullopt;
}
/// Translate from the serialization DefaultArgumentKind enumerators, which are
/// guaranteed to be stable, to the AST ones.
static std::optional<swift::DefaultArgumentKind>
getActualDefaultArgKind(uint8_t raw) {
switch (static_cast<serialization::DefaultArgumentKind>(raw)) {
#define CASE(X) \
case serialization::DefaultArgumentKind::X: \
return swift::DefaultArgumentKind::X;
CASE(None)
CASE(Normal)
CASE(Inherited)
CASE(Column)
CASE(FileID)
CASE(FileIDSpelledAsFile)
CASE(FilePath)
CASE(FilePathSpelledAsFile)
CASE(Line)
CASE(Function)
CASE(DSOHandle)
CASE(NilLiteral)
CASE(EmptyArray)
CASE(EmptyDictionary)
CASE(StoredProperty)
CASE(ExpressionMacro)
#undef CASE
}
return std::nullopt;
}
static std::optional<swift::ActorIsolation::Kind>
getActualActorIsolationKind(uint8_t raw) {
switch (static_cast<serialization::ActorIsolation>(raw)) {
#define CASE(X) \
case serialization::ActorIsolation::X: \
return swift::ActorIsolation::Kind::X;
CASE(Unspecified)
CASE(ActorInstance)
CASE(Nonisolated)
CASE(NonisolatedUnsafe)
CASE(GlobalActor)
CASE(Erased)
#undef CASE
case serialization::ActorIsolation::GlobalActorUnsafe:
return swift::ActorIsolation::GlobalActor;
}
return std::nullopt;
}
static std::optional<StableSerializationPath::ExternalPath::ComponentKind>
getActualClangDeclPathComponentKind(uint64_t raw) {
switch (static_cast<serialization::ClangDeclPathComponentKind>(raw)) {
#define CASE(ID) \
case serialization::ClangDeclPathComponentKind::ID: \
return StableSerializationPath::ExternalPath::ID;
CASE(Record)
CASE(Enum)
CASE(Namespace)
CASE(Typedef)
CASE(TypedefAnonDecl)
CASE(ObjCInterface)
CASE(ObjCProtocol)
#undef CASE
}
return std::nullopt;
}
Expected<ParameterList *> ModuleFile::readParameterList() {
using namespace decls_block;
SmallVector<uint64_t, 8> scratch;
llvm::BitstreamEntry entry =
fatalIfUnexpected(DeclTypeCursor.advance(AF_DontPopBlockAtEnd));
unsigned recordID =
fatalIfUnexpected(DeclTypeCursor.readRecord(entry.ID, scratch));
if (recordID != PARAMETERLIST)
fatal(llvm::make_error<InvalidRecordKindError>(recordID));
ArrayRef<uint64_t> rawMemberIDs;
decls_block::ParameterListLayout::readRecord(scratch, rawMemberIDs);
SmallVector<ParamDecl *, 8> params;
for (DeclID paramID : rawMemberIDs) {
Decl *param;
UNWRAP(getDeclChecked(paramID), param);
params.push_back(cast<ParamDecl>(param));
}
return ParameterList::create(getContext(), params);
}
static std::optional<swift::VarDecl::Introducer>
getActualVarDeclIntroducer(serialization::VarDeclIntroducer raw) {
switch (raw) {
#define CASE(ID) \
case serialization::VarDeclIntroducer::ID: \
return swift::VarDecl::Introducer::ID;
CASE(Let)
CASE(Var)
CASE(InOut)
CASE(Borrowing)
}
#undef CASE
return std::nullopt;
}
Expected<Pattern *> ModuleFile::readPattern(DeclContext *owningDC) {
using namespace decls_block;
SmallVector<uint64_t, 8> scratch;
BCOffsetRAII restoreOffset(DeclTypeCursor);
llvm::BitstreamEntry next =
fatalIfUnexpected(DeclTypeCursor.advance(AF_DontPopBlockAtEnd));
if (next.Kind != llvm::BitstreamEntry::Record)
return diagnoseFatal();
/// 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 =
fatalIfUnexpected(DeclTypeCursor.readRecord(next.ID, scratch));
switch (kind) {
case decls_block::PAREN_PATTERN: {
Pattern *subPattern;
UNWRAP(readPattern(owningDC), subPattern);
auto result = ParenPattern::createImplicit(getContext(), subPattern);
if (Type interfaceType = subPattern->getDelayedInterfaceType())
result->setDelayedInterfaceType(interfaceType, owningDC);
else
result->setType(subPattern->getType());
restoreOffset.reset();
return result;
}
case decls_block::TUPLE_PATTERN: {
TypeID tupleTypeID;
unsigned count;
TuplePatternLayout::readRecord(scratch, tupleTypeID, count);
SmallVector<TuplePatternElt, 8> elements;
for ( ; count > 0; --count) {
scratch.clear();
next = fatalIfUnexpected(DeclTypeCursor.advance());
assert(next.Kind == llvm::BitstreamEntry::Record);
kind = fatalIfUnexpected(DeclTypeCursor.readRecord(next.ID, scratch));
if (kind != decls_block::TUPLE_PATTERN_ELT)
fatal(llvm::make_error<InvalidRecordKindError>(kind));
// FIXME: Add something for this record or remove it.
IdentifierID labelID;
TuplePatternEltLayout::readRecord(scratch, labelID);
Identifier label = getIdentifier(labelID);
Pattern *subPattern;
UNWRAP(readPattern(owningDC), subPattern);
elements.push_back(TuplePatternElt(label, SourceLoc(), subPattern));
}
auto result = TuplePattern::createImplicit(getContext(), elements);
Type tupleType;
UNWRAP(getTypeChecked(tupleTypeID), tupleType);
recordPatternType(result, tupleType);
restoreOffset.reset();
return result;
}
case decls_block::NAMED_PATTERN: {
DeclID varID;
TypeID typeID;
NamedPatternLayout::readRecord(scratch, varID, typeID);
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 = NamedPattern::createImplicit(getContext(), var);
auto typeOrErr = getTypeChecked(typeID);
if (!typeOrErr)
return typeOrErr.takeError();
recordPatternType(result, typeOrErr.get());
restoreOffset.reset();
return result;
}
case decls_block::ANY_PATTERN: {
TypeID typeID;
bool isAsyncLet;
AnyPatternLayout::readRecord(scratch, typeID, isAsyncLet);
auto result = AnyPattern::createImplicit(getContext());
if (isAsyncLet) {
result->setIsAsyncLet();
}
recordPatternType(result, getType(typeID));
restoreOffset.reset();
return result;
}
case decls_block::TYPED_PATTERN: {
TypeID typeID;
TypedPatternLayout::readRecord(scratch, typeID);
Expected<Pattern *> subPattern = readPattern(owningDC);
if (!subPattern) {
// Pass through any errors.
return subPattern;
}
auto type = getType(typeID);
auto result = TypedPattern::createImplicit(getContext(),
subPattern.get(), type);
recordPatternType(result, type);
restoreOffset.reset();
return result;
}
case decls_block::VAR_PATTERN: {
unsigned rawIntroducer;
BindingPatternLayout::readRecord(scratch, rawIntroducer);
Pattern *subPattern;
UNWRAP(readPattern(owningDC), subPattern);
auto introducer = getActualVarDeclIntroducer(
(serialization::VarDeclIntroducer) rawIntroducer);
if (!introducer)
return diagnoseFatal();
auto result = BindingPattern::createImplicit(
getContext(), *introducer, subPattern);
if (Type interfaceType = subPattern->getDelayedInterfaceType())
result->setDelayedInterfaceType(interfaceType, owningDC);
else
result->setType(subPattern->getType());
restoreOffset.reset();
return result;
}
default:
return llvm::make_error<InvalidRecordKindError>(kind);
}
}
SILLayout *ModuleFile::readSILLayout(llvm::BitstreamCursor &Cursor) {
using namespace decls_block;
SmallVector<uint64_t, 16> scratch;
llvm::BitstreamEntry next =
fatalIfUnexpected(Cursor.advance(AF_DontPopBlockAtEnd));
assert(next.Kind == llvm::BitstreamEntry::Record);
unsigned kind = fatalIfUnexpected(Cursor.readRecord(next.ID, scratch));
switch (kind) {
case decls_block::SIL_LAYOUT: {
GenericSignatureID rawGenericSig;
bool capturesGenerics;
unsigned numFields;
ArrayRef<uint64_t> types;
decls_block::SILLayoutLayout::readRecord(scratch, rawGenericSig,
capturesGenerics,
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));
}
CanGenericSignature canSig;
if (auto sig = getGenericSignature(rawGenericSig))
canSig = sig.getCanonicalSignature();
return SILLayout::get(getContext(), canSig, fields, capturesGenerics);
}
default:
fatal(llvm::make_error<InvalidRecordKindError>(kind));
}
}
namespace swift {
class ProtocolConformanceDeserializer {
ModuleFile &MF;
ASTContext &ctx;
using TypeID = serialization::TypeID;
using ProtocolConformanceID = serialization::ProtocolConformanceID;
public:
ProtocolConformanceDeserializer(ModuleFile &mf)
: MF(mf), ctx(mf.getContext()) {}
Expected<ProtocolConformance *>
read(ModuleFile::Serialized<ProtocolConformance *> &entry);
Expected<ProtocolConformance *>
readSelfProtocolConformance(ArrayRef<uint64_t> data);
Expected<ProtocolConformance *>
readSpecializedProtocolConformance(ArrayRef<uint64_t> data);
Expected<ProtocolConformance *>
readInheritedProtocolConformance(ArrayRef<uint64_t> data);
Expected<ProtocolConformance *>
readBuiltinProtocolConformance(ArrayRef<uint64_t> data);
Expected<ProtocolConformance *>
readNormalProtocolConformance(ArrayRef<uint64_t> data,
ModuleFile::Serialized<ProtocolConformance *> &entry);
Expected<ProtocolConformance *>
readNormalProtocolConformanceXRef(ArrayRef<uint64_t> data);
Expected<PackConformance *>
read(ModuleFile::Serialized<PackConformance *> &entry);
};
} // end namespace swift
Expected<ProtocolConformance*>
ProtocolConformanceDeserializer::read(
ModuleFile::Serialized<ProtocolConformance *> &conformanceEntry) {
SmallVector<uint64_t, 16> scratch;
if (auto s = ctx.Stats)
++s->getFrontendCounters().NumConformancesDeserialized;
llvm::BitstreamEntry entry =
MF.fatalIfUnexpected(MF.DeclTypeCursor.advance());
if (entry.Kind != llvm::BitstreamEntry::Record) {
// We don't know how to serialize types represented by sub-blocks.
return MF.diagnoseFatal();
}
StringRef blobData;
unsigned kind = MF.fatalIfUnexpected(
MF.DeclTypeCursor.readRecord(entry.ID, scratch, &blobData));
assert(blobData.empty());
switch (kind) {
case decls_block::SELF_PROTOCOL_CONFORMANCE:
return readSelfProtocolConformance(scratch);
case decls_block::SPECIALIZED_PROTOCOL_CONFORMANCE:
return readSpecializedProtocolConformance(scratch);
case decls_block::INHERITED_PROTOCOL_CONFORMANCE:
return readInheritedProtocolConformance(scratch);
case decls_block::BUILTIN_PROTOCOL_CONFORMANCE:
return readBuiltinProtocolConformance(scratch);
case decls_block::NORMAL_PROTOCOL_CONFORMANCE:
return readNormalProtocolConformance(scratch, conformanceEntry);
case decls_block::PROTOCOL_CONFORMANCE_XREF:
return readNormalProtocolConformanceXRef(scratch);
// Not a protocol conformance.
default:
return MF.diagnoseFatal(llvm::make_error<InvalidRecordKindError>(kind));
}
}
Expected<ProtocolConformance *>
ProtocolConformanceDeserializer::readSelfProtocolConformance(
ArrayRef<uint64_t> scratch) {
using namespace decls_block;
DeclID protoID;
SelfProtocolConformanceLayout::readRecord(scratch, protoID);
auto decl = MF.getDeclChecked(protoID);
if (!decl)
return decl.takeError();
auto proto = cast<ProtocolDecl>(decl.get());
auto conformance = ctx.getSelfConformance(proto);
return conformance;
}
Expected<ProtocolConformance *>
ProtocolConformanceDeserializer::readSpecializedProtocolConformance(
ArrayRef<uint64_t> scratch) {
using namespace decls_block;
ProtocolConformanceID conformanceID;
TypeID conformingTypeID;
SubstitutionMapID substitutionMapID;
SpecializedProtocolConformanceLayout::readRecord(scratch,
conformanceID,
conformingTypeID,
substitutionMapID);
Type conformingType = MF.getType(conformingTypeID);
PrettyStackTraceType trace(MF.getAssociatedModule()->getASTContext(),
"reading specialized conformance for",
conformingType);
auto subMapOrError = MF.getSubstitutionMapChecked(substitutionMapID);
if (!subMapOrError)
return subMapOrError.takeError();
auto subMap = subMapOrError.get();
auto genericConformance = MF.getConformance(conformanceID);
PrettyStackTraceDecl traceTo("... to", genericConformance.getRequirement());
++NumNormalProtocolConformancesLoaded;
auto *rootConformance = cast<NormalProtocolConformance>(
genericConformance.getConcrete());
auto conformance =
ctx.getSpecializedConformance(conformingType, rootConformance, subMap);
return conformance;
}
Expected<ProtocolConformance *>
ProtocolConformanceDeserializer::readInheritedProtocolConformance(
ArrayRef<uint64_t> scratch) {
using namespace decls_block;
ProtocolConformanceID conformanceID;
TypeID conformingTypeID;
InheritedProtocolConformanceLayout::readRecord(scratch, conformanceID,
conformingTypeID);
auto conformingTypeOrError =
MF.getTypeChecked(conformingTypeID);
if (!conformingTypeOrError)
return conformingTypeOrError.takeError();
Type conformingType = conformingTypeOrError.get();
PrettyStackTraceType trace(ctx, "reading inherited conformance for",
conformingType);
ProtocolConformanceRef inheritedConformance =
MF.getConformance(conformanceID);
PrettyStackTraceDecl traceTo("... to",
inheritedConformance.getRequirement());
assert(inheritedConformance.isConcrete() &&
"Abstract inherited conformance?");
auto conformance =
ctx.getInheritedConformance(conformingType,
inheritedConformance.getConcrete());
return conformance;
}
Expected<ProtocolConformance *>
ProtocolConformanceDeserializer::readBuiltinProtocolConformance(
ArrayRef<uint64_t> scratch) {
using namespace decls_block;
TypeID conformingTypeID;
DeclID protoID;
unsigned builtinConformanceKind;
BuiltinProtocolConformanceLayout::readRecord(scratch, conformingTypeID,
protoID, builtinConformanceKind);
auto conformingType = MF.getTypeChecked(conformingTypeID);
if (!conformingType)
return conformingType.takeError();
auto decl = MF.getDeclChecked(protoID);
if (!decl)
return decl.takeError();
auto proto = cast<ProtocolDecl>(decl.get());
auto conformance = ctx.getBuiltinConformance(
conformingType.get(), proto,
static_cast<BuiltinConformanceKind>(builtinConformanceKind));
return conformance;
}
Expected<ProtocolConformance *>
ProtocolConformanceDeserializer::readNormalProtocolConformanceXRef(
ArrayRef<uint64_t> scratch) {
using namespace decls_block;
DeclID protoID;
DeclID nominalID;
ModuleID moduleID;
ProtocolConformanceXrefLayout::readRecord(scratch, protoID, nominalID,
moduleID);
auto maybeNominal = MF.getDeclChecked(nominalID);
if (!maybeNominal)
return maybeNominal.takeError();
auto nominal = cast<NominalTypeDecl>(maybeNominal.get());
PrettyStackTraceDecl trace("cross-referencing conformance for", nominal);
auto proto = cast<ProtocolDecl>(MF.getDecl(protoID));
PrettyStackTraceDecl traceTo("... to", proto);
auto module = MF.getModule(moduleID);
// FIXME: If the module hasn't been loaded, we probably don't want to fall
// back to the current module like this.
if (!module)
module = MF.getAssociatedModule();
SmallVector<ProtocolConformance *, 2> conformances;
nominal->lookupConformance(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", MF);
// 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 conformances.front();
}
Expected<ProtocolConformance *>
ProtocolConformanceDeserializer::readNormalProtocolConformance(
ArrayRef<uint64_t> scratch,
ModuleFile::Serialized<ProtocolConformance *> &conformanceEntry) {
using namespace decls_block;
DeclID protoID;
DeclContextID contextID;
unsigned valueCount, typeCount, conformanceCount, isUnchecked,
isPreconcurrency;
ArrayRef<uint64_t> rawIDs;
NormalProtocolConformanceLayout::readRecord(scratch, protoID,
contextID, typeCount,
valueCount, conformanceCount,
isUnchecked,
isPreconcurrency,
rawIDs);
auto doOrError = MF.getDeclContextChecked(contextID);
if (!doOrError)
return doOrError.takeError();
DeclContext *dc = doOrError.get();
assert(!isa<ClangModuleUnit>(dc->getModuleScopeContext())
&& "should not have serialized a conformance from a clang module");
Type conformingType = dc->getSelfInterfaceType();
PrettyStackTraceType trace(ctx, "reading conformance for", conformingType);
auto protoOrError = MF.getDeclChecked(protoID);