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9916fdf17e
Protocols defined in Objective-C are mangled differently from Swift-defined protocols. Recognize this mangling and search for the appropriate Objective-C protocol using the Objective-C runtime.
538 lines
17 KiB
C++
538 lines
17 KiB
C++
//===--- MetadataLookup.cpp - Swift Language Type Name Lookup -------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Implementations of runtime functions for looking up a type by name.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Basic/LLVM.h"
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#include "swift/Basic/Lazy.h"
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#include "swift/Demangling/Demangler.h"
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#include "swift/Demangling/TypeDecoder.h"
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#include "swift/Runtime/Concurrent.h"
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#include "swift/Runtime/HeapObject.h"
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#include "swift/Runtime/Metadata.h"
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#include "swift/Runtime/Mutex.h"
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#include "swift/Strings.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/PointerIntPair.h"
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#include "llvm/ADT/StringExtras.h"
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#include "Private.h"
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#include "ImageInspection.h"
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#include <vector>
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using namespace swift;
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using namespace Demangle;
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#if SWIFT_OBJC_INTEROP
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#include <objc/runtime.h>
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#include <objc/message.h>
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#include <objc/objc.h>
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#endif
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#pragma mark Nominal type descriptor cache
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// Type Metadata Cache.
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namespace {
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struct TypeMetadataSection {
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const TypeMetadataRecord *Begin, *End;
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const TypeMetadataRecord *begin() const {
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return Begin;
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}
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const TypeMetadataRecord *end() const {
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return End;
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}
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};
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struct NominalTypeDescriptorCacheEntry {
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private:
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std::string Name;
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const NominalTypeDescriptor *Description;
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public:
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NominalTypeDescriptorCacheEntry(const llvm::StringRef name,
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const NominalTypeDescriptor *description)
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: Name(name.str()), Description(description) {}
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const NominalTypeDescriptor *getDescription() {
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return Description;
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}
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int compareWithKey(llvm::StringRef aName) const {
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return aName.compare(Name);
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}
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template <class... T>
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static size_t getExtraAllocationSize(T &&... ignored) {
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return 0;
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}
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};
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} // end anonymous namespace
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struct TypeMetadataState {
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ConcurrentMap<NominalTypeDescriptorCacheEntry> NominalCache;
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std::vector<TypeMetadataSection> SectionsToScan;
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Mutex SectionsToScanLock;
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TypeMetadataState() {
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SectionsToScan.reserve(16);
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initializeTypeMetadataRecordLookup();
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}
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};
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static Lazy<TypeMetadataState> TypeMetadataRecords;
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static void
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_registerTypeMetadataRecords(TypeMetadataState &T,
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const TypeMetadataRecord *begin,
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const TypeMetadataRecord *end) {
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ScopedLock guard(T.SectionsToScanLock);
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T.SectionsToScan.push_back(TypeMetadataSection{begin, end});
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}
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void swift::addImageTypeMetadataRecordBlockCallback(const void *records,
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uintptr_t recordsSize) {
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assert(recordsSize % sizeof(TypeMetadataRecord) == 0
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&& "weird-sized type metadata section?!");
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// If we have a section, enqueue the type metadata for lookup.
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auto recordBytes = reinterpret_cast<const char *>(records);
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auto recordsBegin
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= reinterpret_cast<const TypeMetadataRecord*>(records);
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auto recordsEnd
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= reinterpret_cast<const TypeMetadataRecord*>(recordBytes + recordsSize);
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// Type metadata cache should always be sufficiently initialized by this
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// point. Attempting to go through get() may also lead to an infinite loop,
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// since we register records during the initialization of
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// TypeMetadataRecords.
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_registerTypeMetadataRecords(TypeMetadataRecords.unsafeGetAlreadyInitialized(),
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recordsBegin, recordsEnd);
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}
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void
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swift::swift_registerTypeMetadataRecords(const TypeMetadataRecord *begin,
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const TypeMetadataRecord *end) {
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auto &T = TypeMetadataRecords.get();
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_registerTypeMetadataRecords(T, begin, end);
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}
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// returns the nominal type descriptor for the type named by typeName
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static const NominalTypeDescriptor *
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_searchTypeMetadataRecords(const TypeMetadataState &T,
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const llvm::StringRef typeName) {
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unsigned sectionIdx = 0;
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unsigned endSectionIdx = T.SectionsToScan.size();
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for (; sectionIdx < endSectionIdx; ++sectionIdx) {
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auto §ion = T.SectionsToScan[sectionIdx];
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for (const auto &record : section) {
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if (auto ntd = record.getNominalTypeDescriptor()) {
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if (ntd->Name.get() == typeName)
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return ntd;
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}
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}
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}
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return nullptr;
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}
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static const NominalTypeDescriptor *
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_findNominalTypeDescriptor(llvm::StringRef mangledName) {
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const NominalTypeDescriptor *foundNominal = nullptr;
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auto &T = TypeMetadataRecords.get();
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// Look for an existing entry.
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// Find the bucket for the metadata entry.
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if (auto Value = T.NominalCache.find(mangledName))
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return Value->getDescription();
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// Check type metadata records
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T.SectionsToScanLock.withLock([&] {
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foundNominal = _searchTypeMetadataRecords(T, mangledName);
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});
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// Check protocol conformances table. Note that this has no support for
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// resolving generic types yet.
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if (!foundNominal)
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foundNominal = _searchConformancesByMangledTypeName(mangledName);
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if (foundNominal) {
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T.NominalCache.getOrInsert(mangledName, foundNominal);
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}
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return foundNominal;
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}
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#pragma mark Protocol descriptor cache
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namespace {
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struct ProtocolSection {
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const ProtocolRecord *Begin, *End;
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const ProtocolRecord *begin() const {
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return Begin;
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}
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const ProtocolRecord *end() const {
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return End;
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}
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};
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struct ProtocolDescriptorCacheEntry {
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private:
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std::string Name;
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const ProtocolDescriptor *Description;
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public:
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ProtocolDescriptorCacheEntry(const llvm::StringRef name,
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const ProtocolDescriptor *description)
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: Name(name.str()), Description(description) {}
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const ProtocolDescriptor *getDescription() {
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return Description;
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}
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int compareWithKey(llvm::StringRef aName) const {
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return aName.compare(Name);
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}
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template <class... T>
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static size_t getExtraAllocationSize(T &&... ignored) {
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return 0;
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}
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};
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struct ProtocolMetadataState {
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ConcurrentMap<ProtocolDescriptorCacheEntry> ProtocolCache;
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std::vector<ProtocolSection> SectionsToScan;
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Mutex SectionsToScanLock;
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ProtocolMetadataState() {
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SectionsToScan.reserve(16);
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initializeProtocolLookup();
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}
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};
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static Lazy<ProtocolMetadataState> Protocols;
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}
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static void
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_registerProtocols(ProtocolMetadataState &C,
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const ProtocolRecord *begin,
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const ProtocolRecord *end) {
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ScopedLock guard(C.SectionsToScanLock);
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C.SectionsToScan.push_back(ProtocolSection{begin, end});
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}
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void swift::addImageProtocolsBlockCallback(const void *protocols,
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uintptr_t protocolsSize) {
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assert(protocolsSize % sizeof(ProtocolRecord) == 0 &&
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"protocols section not a multiple of ProtocolRecord");
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// If we have a section, enqueue the protocols for lookup.
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auto protocolsBytes = reinterpret_cast<const char *>(protocols);
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auto recordsBegin
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= reinterpret_cast<const ProtocolRecord *>(protocols);
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auto recordsEnd
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= reinterpret_cast<const ProtocolRecord *>(protocolsBytes + protocolsSize);
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// Conformance cache should always be sufficiently initialized by this point.
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_registerProtocols(Protocols.unsafeGetAlreadyInitialized(),
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recordsBegin, recordsEnd);
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}
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void swift::swift_registerProtocols(const ProtocolRecord *begin,
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const ProtocolRecord *end) {
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auto &C = Protocols.get();
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_registerProtocols(C, begin, end);
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}
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static const ProtocolDescriptor *
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_searchProtocolRecords(const ProtocolMetadataState &C,
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const llvm::StringRef protocolName){
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unsigned sectionIdx = 0;
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unsigned endSectionIdx = C.SectionsToScan.size();
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for (; sectionIdx < endSectionIdx; ++sectionIdx) {
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auto §ion = C.SectionsToScan[sectionIdx];
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for (const auto &record : section) {
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if (auto protocol = record.Protocol.getPointer()) {
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// Drop the "S$" prefix from the protocol record. It's not used in
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// the type itself.
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StringRef foundProtocolName = protocol->Name;
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assert(foundProtocolName.startswith("$S"));
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foundProtocolName = foundProtocolName.drop_front(2);
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if (foundProtocolName == protocolName)
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return protocol;
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}
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}
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}
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return nullptr;
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}
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static const ProtocolDescriptor *
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_findProtocolDescriptor(llvm::StringRef mangledName) {
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const ProtocolDescriptor *foundProtocol = nullptr;
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auto &T = Protocols.get();
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// Look for an existing entry.
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// Find the bucket for the metadata entry.
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if (auto Value = T.ProtocolCache.find(mangledName))
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return Value->getDescription();
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// Check type metadata records
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T.SectionsToScanLock.withLock([&] {
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foundProtocol = _searchProtocolRecords(T, mangledName);
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});
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if (foundProtocol) {
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T.ProtocolCache.getOrInsert(mangledName, foundProtocol);
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}
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return foundProtocol;
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}
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#pragma mark Metadata lookup via mangled name
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#if SWIFT_OBJC_INTEROP
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/// For a mangled node that refers to an Objective-C class or protocol,
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/// return the class or protocol name.
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static Optional<StringRef> getObjCClassOrProtocolName(
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const Demangle::NodePointer &node) {
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if (node->getKind() != Demangle::Node::Kind::Class &&
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node->getKind() != Demangle::Node::Kind::Protocol)
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return None;
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if (node->getNumChildren() != 2)
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return None;
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// Check whether we have the __ObjC module.
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auto moduleNode = node->getChild(0);
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if (moduleNode->getKind() != Demangle::Node::Kind::Module ||
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moduleNode->getText() != MANGLING_MODULE_OBJC)
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return None;
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// Check whether we have an identifier.
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auto nameNode = node->getChild(1);
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if (nameNode->getKind() != Demangle::Node::Kind::Identifier)
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return None;
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return nameNode->getText();
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}
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#endif
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namespace {
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/// Constructs metadata by decoding a mangled type name, for use with
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/// \c TypeDecoder.
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class DecodedMetadataBuilder {
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public:
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using BuiltType = const Metadata *;
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using BuiltNominalTypeDecl = const NominalTypeDescriptor *;
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using BuiltProtocolDecl = const ProtocolDescriptor *;
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BuiltNominalTypeDecl createNominalTypeDecl(
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const Demangle::NodePointer &node) const {
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// FIXME: Mangled Objective-C class names should go directly
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// through objc_lookupClass.
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// Look for a nominal type descriptor based on its mangled name.
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auto mangledName = Demangle::mangleNode(node);
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return _findNominalTypeDescriptor(mangledName);
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}
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BuiltProtocolDecl createProtocolDecl(
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const Demangle::NodePointer &node) const {
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#if SWIFT_OBJC_INTEROP
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// If we have an Objective-C class name, call into the Objective-C
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// runtime to find them.
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if (auto objcProtocolName = getObjCClassOrProtocolName(node)) {
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return (ProtocolDescriptor *)objc_getProtocol(
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objcProtocolName->str().c_str());
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}
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#endif
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auto mangledName = Demangle::mangleNode(node);
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// Look for a Swift protocol with this mangled name.
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if (auto protocol = _findProtocolDescriptor(mangledName))
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return protocol;
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#if SWIFT_OBJC_INTEROP
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// Look for a Swift-defined @objc protocol with the Swift 3 mangling that
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// is used for Objective-C entities.
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std::string objcMangledName =
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"_TtP" + mangledName.substr(0, mangledName.size()-1) + "_";
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if (auto protocol = objc_getProtocol(objcMangledName.c_str()))
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return (ProtocolDescriptor *)protocol;
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#endif
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return nullptr;
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}
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BuiltType createNominalType(BuiltNominalTypeDecl typeDecl,
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BuiltType parent) const {
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// FIXME: Generic nominal types.
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if (typeDecl->GenericParams.isGeneric())
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return BuiltType();
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// Use the access function to compute type metadata.
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if (auto accessFunction = typeDecl->getAccessFunction()) {
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return accessFunction();
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}
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// FIXME: Shouldn't get here? We've hit an unsupported case.
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return BuiltType();
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}
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BuiltType createBoundGenericType(BuiltNominalTypeDecl typeDecl,
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ArrayRef<BuiltType> genericArgs,
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BuiltType parent) const {
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// FIXME: Implement.
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return BuiltType();
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}
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BuiltType createBuiltinType(StringRef mangledName) const {
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// FIXME: Implement.
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return BuiltType();
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}
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BuiltType createMetatypeType(BuiltType instance, bool wasAbstract) const {
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return swift_getMetatypeMetadata(instance);
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}
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BuiltType createExistentialMetatypeType(BuiltType instance) const {
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return swift_getExistentialMetatypeMetadata(instance);
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}
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BuiltType createProtocolCompositionType(ArrayRef<BuiltProtocolDecl> protocols,
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BuiltType superclass,
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bool isClassBound) const {
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// Determine whether we have a class bound.
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ProtocolClassConstraint classConstraint = ProtocolClassConstraint::Any;
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if (isClassBound || superclass) {
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classConstraint = ProtocolClassConstraint::Class;
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} else {
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for (auto protocol : protocols) {
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if (protocol->Flags.getClassConstraint()
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== ProtocolClassConstraint::Class) {
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classConstraint = ProtocolClassConstraint::Class;
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break;
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}
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}
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}
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return swift_getExistentialTypeMetadata(classConstraint, superclass,
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protocols.size(), protocols.data());
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}
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BuiltType createGenericTypeParameterType(unsigned depth,
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unsigned index) const {
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// FIXME: Implement substitution logic here.
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return BuiltType();
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}
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BuiltType createFunctionType(
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ArrayRef<Demangle::FunctionParam<BuiltType>> params,
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BuiltType result, FunctionTypeFlags flags) const {
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std::vector<BuiltType> paramTypes;
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std::vector<uint32_t> paramFlags;
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// Fill in the parameters.
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paramTypes.reserve(params.size());
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if (flags.hasParameterFlags())
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paramFlags.reserve(params.size());
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for (const auto ¶m : params) {
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paramTypes.push_back(param.getType());
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if (flags.hasParameterFlags())
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paramFlags.push_back(param.getFlags().getIntValue());
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}
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return swift_getFunctionTypeMetadata(flags, paramTypes.data(),
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flags.hasParameterFlags()
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? paramFlags.data()
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: nullptr,
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result);
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}
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BuiltType createTupleType(ArrayRef<BuiltType> elements,
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std::string labels,
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bool variadic) const {
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// TODO: 'variadic' should no longer exist
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TupleTypeFlags flags(0);
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if (!labels.empty())
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flags = flags.withNonConstantLabels(true);
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return swift_getTupleTypeMetadata(elements.size(), elements.data(),
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labels.empty() ? nullptr : labels.c_str(),
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flags, /*proposedWitnesses=*/nullptr);
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}
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BuiltType createDependentMemberType(StringRef name, BuiltType base,
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BuiltProtocolDecl protocol) const {
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// FIXME: Implement.
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return BuiltType();
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}
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BuiltType createUnownedStorageType(BuiltType base) const {
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// FIXME: Implement.
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return BuiltType();
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}
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BuiltType createUnmanagedStorageType(BuiltType base) const {
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// FIXME: Implement.
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return BuiltType();
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}
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BuiltType createWeakStorageType(BuiltType base) const {
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// FIXME: Implement.
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return BuiltType();
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}
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BuiltType createSILBoxType(BuiltType base) const {
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// FIXME: Implement.
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return BuiltType();
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}
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};
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}
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SWIFT_CC(swift) SWIFT_RUNTIME_STDLIB_INTERNAL
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const Metadata * _Nullable
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swift_getTypeByMangledName(const char *typeNameStart, size_t typeNameLength) {
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llvm::StringRef typeName(typeNameStart, typeNameLength);
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Demangler demangler;
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NodePointer node;
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// Check whether this is the convenience syntax "ModuleName.ClassName".
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size_t dotPos = typeName.find('.');
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if (dotPos != llvm::StringRef::npos &&
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typeName.find('.', dotPos + 1) == llvm::StringRef::npos) {
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// Form a demangle tree for this class.
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NodePointer classNode = demangler.createNode(Node::Kind::Class);
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NodePointer moduleNode = demangler.createNode(Node::Kind::Module,
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typeName.substr(0, dotPos));
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NodePointer nameNode = demangler.createNode(Node::Kind::Identifier,
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typeName.substr(dotPos + 1));
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classNode->addChild(moduleNode, demangler);
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classNode->addChild(nameNode, demangler);
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node = classNode;
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} else {
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// Demangle the type name.
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node = demangler.demangleType(typeName);
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if (!node) return nullptr;
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}
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DecodedMetadataBuilder builder;
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return Demangle::decodeMangledType(builder, node);
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}
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