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--- dyld/dyld-955/common/OptimizerSwift.cpp
+++ /dev/null
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-/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
- *
- * Copyright (c) 2014 Apple Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-// Swift Optimizations
-//
-// The shared cache Swift optimizations are designed to speed up protocol conformance
-// lookups.
-//
-// Protocol conformances are stored as an array on each dylib. To find out if a type conforms
-// to a protocol, Swift must walk these arrays in all loaded dylibs. This is then cached in
-// the Swift runtime.
-//
-// This optimization builds a number of hash tables to speed up these lookups, and allows the
-// Swift runtime to avoid caching the results from these tables. This saves both time and memory.
-//
-// We start by finding all protocol conformances by walking the "__TEXT, __swift5_proto" section.
-// There are several kinds of conformance:
-// 1) (type*, protocol*)
-// 2) (objc_class*, protocol*)
-// 3) (class name*, protocol*)
-// 4) (foreign metadata name*, protocol*)
-//
-// 1) Type Pointers
-//
-// These are made up of a pointer to a type, and a pointer to a protocol.
-// We turn these in to shared cache offsets for the type, protocol, conformance,
-// and the index of the dylib containing the conformance. See SwiftTypeProtocolConformanceLocation.
-// At runtime, we look in the table at typeConformanceHashTableCacheOffset, to see if a given type and
-// protocol are in the table, and if the conformance is from a loaded image.
-// Note it is possible for this table to contain duplicates. In this case, we return the first found
-// conformance, in the order we found them in the shared cache.
-//
-// 2) ObjC Class Pointers
-//
-// These are similar to type pointers, but are classed as metadata in the Swift runtime.
-// Again, similarly to the above, we convert the metadata, protocol, and conformance pointers to
-// shared cache offsets. See SwiftForeignTypeProtocolConformanceLocationKey.
-// At runtime, we may be passed a non-null metadata pointer. In that case, we search the table
-// reached via metadataConformanceHashTableCacheOffset, for matching a ObjC Class and Protocol,
-// and check that the conformance dylib is loaded. Again duplicates are supported.
-//
-// 3) ObjC Class Names
-//
-// In this case, we have the "const char*" name of the ObjC class to lookup. The Swift runtime does
-// this by asking the ObjC runtime for the Class with this name. In the shared cache, we use the ObjC
-// class hash table to find the Class pointers for all classes with the given name. As we won't know
-// which one is loaded, we record them all, so duplicates are likely to happen here.
-// The Class pointers we find from the ObjC hash table are converted to shared cache offsets, and stored
-// in the same hash table as 2) above. All other details in 2) apply.
-//
-// 4) Foreign Metadata Names
-//
-// These names are found via the Type Pointers in 1). We visiting a TypeDescriptor, we may
-// find it has an attached Foreign Name. This is used when the Swift runtime wants to unique a Type by
-// name, not by pointer.
-// In this case, names and their protocols are converted to cache offsets and stored in the hash table
-// found via foreignTypeConformanceHashTableCacheOffset.
-// At runtime, the Swift runtime will pass a name and protocol to look up in this table.
-//
-// Foreign metadata names may additionally have "ImportInfo", which describes an alternative name to use.
-// This alternative name is the key we store in the map. It can be found by the getForeignFullIdentity() method.
-// The Swift runtime also knows if metadata has one of these "Full Identities", and will always pass in the
-// Full Identity when calling the SPI. At runtime, dyld does not know that a given entry in the map is
-// a regular Foreign metadata name, or the Full Identity.
-//
-// One final quirk of Full Identity names, is that they can contain null characters. Eg, NNSFoo\0St.
-// Given this, all of the code to handle foreign metadata names, including lookups in the hash table, and
-// the SPI below, take name and name length. We never assume that the name is a null-terminated C string.
-//
-// SPIs
-//
-// The above types are stored in 3 tables: Type, Metadata, Foreign Metadata.
-// These are accessed by 2 different SPIs.
-//
-// _dyld_find_protocol_conformance()
-//
-// This searches for types and metadata. It takes Type* and Metadata* arguments
-// and looks up the corresponding table, depending on which of Type* or Metadata*
-// is non-null.
-//
-// _dyld_find_foreign_type_protocol_conformance()
-//
-// This looks up the given name in the Foreign Metadata table. Matches are done
-// by string comparison. As noted above in 4), the name may contain null characters
-// so all hashing, etc, is done with std::string_view which allows null characters.
-
-
-#include "DyldSharedCache.h"
-#include "Diagnostics.h"
-#include "MachOLoaded.h"
-#include "MachOAnalyzer.h"
-#include "OptimizerObjC.h"
-#include "OptimizerSwift.h"
-#include "PerfectHash.h"
-
-#if BUILDING_CACHE_BUILDER
-#include "SharedCacheBuilder.h"
-#include "objc-shared-cache.h"
-#endif
-
-typedef dyld3::MachOAnalyzer::SwiftProtocolConformance SwiftProtocolConformance;
-
-// Tracks which types conform to which protocols
-
-namespace std {
- template<>
- struct hash<SwiftTypeProtocolConformanceLocationKey>
- {
- size_t operator()(const SwiftTypeProtocolConformanceLocationKey& v) const {
- return std::hash<uint64_t>{}(v.typeDescriptorCacheOffset) ^ std::hash<uint64_t>{}(v.protocolCacheOffset);
- }
- };
-
- template<>
- struct equal_to<SwiftTypeProtocolConformanceLocationKey>
- {
- bool operator()(const SwiftTypeProtocolConformanceLocationKey& a,
- const SwiftTypeProtocolConformanceLocationKey& b) const {
- return a.typeDescriptorCacheOffset == b.typeDescriptorCacheOffset && a.protocolCacheOffset == b.protocolCacheOffset;
- }
- };
-}
-
-// Tracks which Metadata conform to which protocols
-
-namespace std {
- template<>
- struct hash<SwiftMetadataProtocolConformanceLocationKey>
- {
- size_t operator()(const SwiftMetadataProtocolConformanceLocationKey& v) const {
- return std::hash<uint64_t>{}(v.metadataCacheOffset) ^ std::hash<uint64_t>{}(v.protocolCacheOffset);
- }
- };
-
- template<>
- struct equal_to<SwiftMetadataProtocolConformanceLocationKey>
- {
- bool operator()(const SwiftMetadataProtocolConformanceLocationKey& a,
- const SwiftMetadataProtocolConformanceLocationKey& b) const {
- return a.metadataCacheOffset == b.metadataCacheOffset && a.protocolCacheOffset == b.protocolCacheOffset;
- }
- };
-}
-
-// Tracks which foreign types conform to which protocols
-
-namespace std {
- template<>
- struct hash<SwiftForeignTypeProtocolConformanceLocationKey>
- {
- size_t operator()(const SwiftForeignTypeProtocolConformanceLocationKey& v) const {
- return std::hash<uint64_t>{}(v.rawForeignDescriptor) ^ std::hash<uint64_t>{}(v.protocolCacheOffset);
- }
- };
-
- template<>
- struct equal_to<SwiftForeignTypeProtocolConformanceLocationKey>
- {
- bool operator()(const SwiftForeignTypeProtocolConformanceLocationKey& a,
- const SwiftForeignTypeProtocolConformanceLocationKey& b) const {
- return a.rawForeignDescriptor == b.rawForeignDescriptor && a.protocolCacheOffset == b.protocolCacheOffset;
- }
- };
-}
-
-// Type Hash Table methods
-template<>
-uint32_t SwiftHashTable::hash(const SwiftTypeProtocolConformanceLocationKey& key,
- const uint8_t*) const {
- uint64_t val1 = objc::lookup8(key.key1Buffer(nullptr), key.key1Size(), salt);
- uint64_t val2 = objc::lookup8((uint8_t*)&key.protocolCacheOffset, sizeof(key.protocolCacheOffset), salt);
- uint64_t val = val1 ^ val2;
- uint32_t index = (uint32_t)((shift == 64) ? 0 : (val>>shift)) ^ scramble[tab[val&mask]];
- return index;
-}
-
-
-template<>
-bool SwiftHashTable::equal(const SwiftTypeProtocolConformanceLocationKey& key, const SwiftTypeProtocolConformanceLocationKey& value,
- const uint8_t*) const {
- return memcmp(&key, &value, sizeof(SwiftTypeProtocolConformanceLocationKey)) == 0;
-}
-
-template<>
-SwiftHashTable::CheckByteType SwiftHashTable::checkbyte(const SwiftTypeProtocolConformanceLocationKey& key, const uint8_t*) const
-{
- const uint8_t* keyBytes = (const uint8_t*)&key;
- return ((keyBytes[0] & 0x7) << 5) | ((uint8_t)sizeof(SwiftTypeProtocolConformanceLocationKey) & 0x1f);
-}
-
-// Metadata Hash Table methods
-template<>
-uint32_t SwiftHashTable::hash(const SwiftMetadataProtocolConformanceLocationKey& key,
- const uint8_t*) const {
- uint64_t val1 = objc::lookup8(key.key1Buffer(nullptr), key.key1Size(), salt);
- uint64_t val2 = objc::lookup8((uint8_t*)&key.protocolCacheOffset, sizeof(key.protocolCacheOffset), salt);
- uint64_t val = val1 ^ val2;
- uint32_t index = (uint32_t)((shift == 64) ? 0 : (val>>shift)) ^ scramble[tab[val&mask]];
- return index;
-}
-
-
-template<>
-bool SwiftHashTable::equal(const SwiftMetadataProtocolConformanceLocationKey& key, const SwiftMetadataProtocolConformanceLocationKey& value,
- const uint8_t*) const {
- return memcmp(&key, &value, sizeof(SwiftMetadataProtocolConformanceLocationKey)) == 0;
-}
-
-template<>
-SwiftHashTable::CheckByteType SwiftHashTable::checkbyte(const SwiftMetadataProtocolConformanceLocationKey& key, const uint8_t*) const
-{
- const uint8_t* keyBytes = (const uint8_t*)&key;
- return ((keyBytes[0] & 0x7) << 5) | ((uint8_t)sizeof(SwiftTypeProtocolConformanceLocationKey) & 0x1f);
-}
-
-// Foreign Type Hash Table methods
-template<>
-uint32_t SwiftHashTable::hash(const SwiftForeignTypeProtocolConformanceLocationKey& key,
- const uint8_t* stringBaseAddress) const {
- // Combine the hashes of the foreign type string and the protocol cache offset.
- // Then combine them to get the hash for this value
- const char* name = (const char*)stringBaseAddress + key.foreignDescriptorNameCacheOffset;
- uint64_t val1 = objc::lookup8((uint8_t*)name, key.foreignDescriptorNameLength, salt);
- uint64_t val2 = objc::lookup8((uint8_t*)&key.protocolCacheOffset, sizeof(key.protocolCacheOffset), salt);
- uint64_t val = val1 ^ val2;
- uint32_t index = (uint32_t)((shift == 64) ? 0 : (val>>shift)) ^ scramble[tab[val&mask]];
- return index;
-}
-
-
-template<>
-bool SwiftHashTable::equal(const SwiftForeignTypeProtocolConformanceLocationKey& key, const SwiftForeignTypeProtocolConformanceLocationKey& value,
- const uint8_t*) const {
- return memcmp(&key, &value, sizeof(SwiftForeignTypeProtocolConformanceLocationKey)) == 0;
-}
-
-template<>
-SwiftHashTable::CheckByteType SwiftHashTable::checkbyte(const SwiftForeignTypeProtocolConformanceLocationKey& key, const uint8_t* stringBaseAddress) const
-{
- const char* name = (const char*)stringBaseAddress + key.foreignDescriptorNameCacheOffset;
- const uint8_t* keyBytes = (const uint8_t*)name;
- return ((keyBytes[0] & 0x7) << 5) | ((uint8_t)key.foreignDescriptorNameLength & 0x1f);
-}
-
-// Foreign Type Hash Table methods, using a string as a key
-template<>
-uint32_t SwiftHashTable::hash(const SwiftForeignTypeProtocolConformanceLookupKey& key,
- const uint8_t* stringBaseAddress) const {
- // Combine the hashes of the foreign type string and the protocol cache offset.
- // Then combine them to get the hash for this value
- const std::string_view& name = key.foreignDescriptorName;
- uint64_t val1 = objc::lookup8((uint8_t*)name.data(), name.size(), salt);
- uint64_t val2 = objc::lookup8((uint8_t*)&key.protocolCacheOffset, sizeof(key.protocolCacheOffset), salt);
- uint64_t val = val1 ^ val2;
- uint32_t index = (uint32_t)((shift == 64) ? 0 : (val>>shift)) ^ scramble[tab[val&mask]];
- return index;
-}
-
-
-template<>
-bool SwiftHashTable::equal(const SwiftForeignTypeProtocolConformanceLocationKey& key, const SwiftForeignTypeProtocolConformanceLookupKey& value,
- const uint8_t* stringBaseAddress) const {
- std::string_view keyName((const char*)key.key1Buffer(stringBaseAddress), key.key1Size());
- return (key.protocolCacheOffset == value.protocolCacheOffset) && (keyName == value.foreignDescriptorName);
-}
-
-template<>
-SwiftHashTable::CheckByteType SwiftHashTable::checkbyte(const SwiftForeignTypeProtocolConformanceLookupKey& key, const uint8_t* stringBaseAddress) const
-{
- const std::string_view& name = key.foreignDescriptorName;
- const uint8_t* keyBytes = (const uint8_t*)name.data();
- return ((keyBytes[0] & 0x7) << 5) | ((uint8_t)name.size() & 0x1f);
-}
-
-#if BUILDING_CACHE_BUILDER
-
-// Swift hash tables
-template<typename TargetT>
-static void make_perfect(const std::vector<TargetT> targets, const uint8_t* stringBaseAddress,
- objc::PerfectHash& phash)
-{
- dyld3::OverflowSafeArray<objc::PerfectHash::key> keys;
-
- /* read in the list of keywords */
- keys.reserve(targets.size());
- for (const TargetT& target : targets) {
- objc::PerfectHash::key mykey;
- mykey.name1_k = (uint8_t*)target.key1Buffer(stringBaseAddress);
- mykey.len1_k = (uint32_t)target.key1Size();
- mykey.name2_k = (uint8_t*)target.key2Buffer(stringBaseAddress);
- mykey.len2_k = (uint32_t)target.key2Size();
- keys.push_back(mykey);
- }
-
- objc::PerfectHash::make_perfect(keys, phash);
-}
-
-template<typename PerfectHashT, typename TargetT>
-void SwiftHashTable::write(const PerfectHashT& phash, const std::vector<TargetT>& targetValues,
- const uint8_t* targetValuesBufferBaseAddress,
- const uint8_t* stringBaseAddress)
-{
- // Set header
- capacity = phash.capacity;
- occupied = phash.occupied;
- shift = phash.shift;
- mask = phash.mask;
- sentinelTarget = sentinel;
- roundedTabSize = std::max(phash.mask+1, 4U);
- salt = phash.salt;
-
- // Set hash data
- for (uint32_t i = 0; i < 256; i++) {
- scramble[i] = phash.scramble[i];
- }
- for (uint32_t i = 0; i < phash.mask+1; i++) {
- tab[i] = phash.tab[i];
- }
-
- dyld3::Array<TargetOffsetType> targetsArray = targets();
- dyld3::Array<CheckByteType> checkBytesArray = checkBytes();
-
- // Set offsets to the sentinel
- for (uint32_t i = 0; i < phash.capacity; i++) {
- targetsArray[i] = sentinel;
- }
- // Set checkbytes to 0
- for (uint32_t i = 0; i < phash.capacity; i++) {
- checkBytesArray[i] = 0;
- }
-
- // Set real value offsets and checkbytes
- uint32_t offsetOfTargetBaseFromMap = (uint32_t)((uint64_t)targetValuesBufferBaseAddress - (uint64_t)this);
- bool skipNext = false;
- for (const TargetT& targetValue : targetValues) {
- // Skip chains of duplicates
- bool skipThisEntry = skipNext;
- skipNext = targetValue.nextIsDuplicate;
- if ( skipThisEntry )
- continue;
-
- uint32_t h = hash<typename TargetT::KeyType>(targetValue, stringBaseAddress);
- uint32_t offsetOfTargetValueInArray = (uint32_t)((uint64_t)&targetValue - (uint64_t)targetValues.data());
- assert(targetsArray[h] == sentinel);
- targetsArray[h] = offsetOfTargetBaseFromMap + offsetOfTargetValueInArray;
- assert(checkBytesArray[h] == 0);
- checkBytesArray[h] = checkbyte<typename TargetT::KeyType>(targetValue, stringBaseAddress);
- }
-}
-
-// Map from an unsigned 32-bit type to its signed counterpart.
-// Used for offset calculations
-template<typename PointerType>
-struct OffsetType {
-};
-
-template<>
-struct OffsetType<uint32_t> {
- typedef int32_t SignedType;
-};
-
-template<>
-struct OffsetType<uint64_t> {
- typedef int64_t SignedType;
-};
-
-template <typename PointerType>
-struct header_info_rw {
-};
-
-template<>
-struct header_info_rw<uint64_t> {
-
- bool getLoaded() const {
- return isLoaded;
- }
-
-private:
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunused-private-field"
- uint64_t isLoaded : 1;
- uint64_t allClassesRealized : 1;
- uint64_t next : 62;
-#pragma clang diagnostic pop
-};
-
-template<>
-struct header_info_rw<uint32_t> {
-
- bool getLoaded() const {
- return isLoaded;
- }
-
-private:
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunused-private-field"
- uint32_t isLoaded : 1;
- uint32_t allClassesRealized : 1;
- uint32_t next : 30;
-#pragma clang diagnostic pop
-};
-
-template <typename PointerType>
-class objc_header_info_ro_t {
-private:
- PointerType mhdr_offset; // offset to mach_header or mach_header_64
- PointerType info_offset; // offset to objc_image_info *
-
-public:
- const mach_header* mhdr() const {
- typedef typename OffsetType<PointerType>::SignedType SignedType;
- return (const mach_header*)(((intptr_t)&mhdr_offset) + (SignedType)mhdr_offset);
- }
-};
-
-template <typename PointerType>
-struct objc_headeropt_ro_t {
- uint32_t count;
- uint32_t entsize;
- objc_header_info_ro_t<PointerType> headers[0]; // sorted by mhdr address
-
- objc_header_info_ro_t<PointerType>& getOrEnd(uint32_t i) const {
- assert(i <= count);
- return *(objc_header_info_ro_t<PointerType>*)((uint8_t *)&headers + (i * entsize));
- }
-
- objc_header_info_ro_t<PointerType>& get(uint32_t i) const {
- assert(i < count);
- return *(objc_header_info_ro_t<PointerType>*)((uint8_t *)&headers + (i * entsize));
- }
-
- uint32_t index(const objc_header_info_ro_t<PointerType>* hi) const {
- const objc_header_info_ro_t<PointerType>* begin = &get(0);
- const objc_header_info_ro_t<PointerType>* end = &getOrEnd(count);
- assert(hi >= begin && hi < end);
- return (uint32_t)(((uintptr_t)hi - (uintptr_t)begin) / entsize);
- }
-
- objc_header_info_ro_t<PointerType>* get(const mach_header* mhdr)
- {
- int32_t start = 0;
- int32_t end = count;
- while (start <= end) {
- int32_t i = (start+end)/2;
- objc_header_info_ro_t<PointerType> &hi = get(i);
- if (mhdr == hi.mhdr()) return &hi;
- else if (mhdr < hi.mhdr()) end = i-1;
- else start = i+1;
- }
-
- return nullptr;
- }
-};
-
-template <typename PointerType>
-struct objc_headeropt_rw_t {
- uint32_t count;
- uint32_t entsize;
- header_info_rw<PointerType> headers[0]; // sorted by mhdr address
-
- void* get(uint32_t i) const {
- assert(i < count);
- return (void*)((uint8_t *)&headers + (i * entsize));
- }
-};
-
-static std::optional<uint16_t> getPreoptimizedHeaderRWIndex(const void* headerInfoRO, const void* headerInfoRW, const dyld3::MachOAnalyzer* ma)
-{
- assert(headerInfoRO != nullptr);
- assert(headerInfoRW != nullptr);
- if ( ma->is64() ) {
- typedef uint64_t PointerType;
- objc_headeropt_ro_t<PointerType>* hinfoRO = (objc_headeropt_ro_t<PointerType>*)headerInfoRO;
- objc_headeropt_rw_t<PointerType>* hinfoRW = (objc_headeropt_rw_t<PointerType>*)headerInfoRW;
-
- objc_header_info_ro_t<PointerType>* hdr = hinfoRO->get(ma);
- if ( hdr == nullptr )
- return {};
- int32_t index = hinfoRO->index(hdr);
- assert(hinfoRW->entsize == sizeof(header_info_rw<PointerType>));
- return (uint16_t)index;
- } else {
- typedef uint32_t PointerType;
- objc_headeropt_ro_t<PointerType>* hinfoRO = (objc_headeropt_ro_t<PointerType>*)headerInfoRO;
- objc_headeropt_rw_t<PointerType>* hinfoRW = (objc_headeropt_rw_t<PointerType>*)headerInfoRW;
-
- objc_header_info_ro_t<PointerType>* hdr = hinfoRO->get(ma);
- if ( hdr == nullptr )
- return {};
- int32_t index = hinfoRO->index(hdr);
- assert(hinfoRW->entsize == sizeof(header_info_rw<PointerType>));
- return (uint16_t)index;
- }
-}
-
-// Foreign metadata names might not be a regular C string. Instead they might be
-// a NULL-separated array of C strings. The "full identity" is the result including any
-// intermidiate NULL characters. Eg, "NNSFoo\0St" would be a legitimate result
-static std::string_view getForeignFullIdentity(const char* arrayStart)
-{
- // Track the extent of the current component.
- const char* componentStart = arrayStart;
- const char* componentEnd = componentStart + strlen(arrayStart);
-
- // Set initial range to the extent of the user-facing name.
- const char* identityBeginning = componentStart;
- const char* identityEnd = componentEnd;
-
- // Start examining the following array components, starting past the NUL
- // terminator of the user-facing name:
- while (true) {
- // Advance past the NUL terminator.
- componentStart = componentEnd + 1;
- componentEnd = componentStart + strlen(componentStart);
-
- // If the component is empty, then we're done.
- if (componentStart == componentEnd)
- break;
-
- // Switch on the component type at the beginning of the component.
- switch (componentStart[0]) {
- case 'N':
- // ABI name, set identity beginning and end.
- identityBeginning = componentStart + 1;
- identityEnd = componentEnd;
- break;
- case 'S':
- case 'R':
- // Symbol namespace or related entity name, set identity end.
- identityEnd = componentEnd;
- break;
- default:
- // Ignore anything else.
- break;
- }
- }
-
- size_t stringSize = identityEnd - identityBeginning;
- return std::string_view(identityBeginning, stringSize);
-}
-
-static bool findProtocolConformances(Diagnostics& diags, const DyldSharedCache* dyldCache,
- std::vector<SwiftTypeProtocolConformanceLocation>& foundTypeProtocolConformances,
- std::vector<SwiftMetadataProtocolConformanceLocation>& foundMetadataProtocolConformances,
- std::vector<SwiftForeignTypeProtocolConformanceLocation>& foundForeignTypeProtocolConformances)
-{
- // If we have the read only data, make sure it has a valid selector table inside.
- const objc_opt::objc_opt_t* optObjCHeader = dyldCache->objcOpt();
- const objc::ClassHashTable* classHashTable = nullptr;
- if ( optObjCHeader != nullptr ) {
- classHashTable = optObjCHeader->classOpt();
- }
-
- if ( classHashTable == nullptr ) {
- diags.warning("Skipped optimizing Swift protocols due to missing objc class optimisations");
- return false;
- }
-
- const void* headerInfoRO = (const void*)optObjCHeader->headeropt_ro();
- const void* headerInfoRW = (const void*)optObjCHeader->headeropt_rw();
- if ( (headerInfoRO == nullptr) || (headerInfoRW == nullptr) ) {
- diags.warning("Skipped optimizing Swift protocols due to missing objc header infos");
- return false;
- }
-
- const bool log = false;
-
- // Find all conformances in all binaries
- dyldCache->forEachImage(^(const mach_header* machHeader, const char* installName) {
-
- if ( diags.hasError() )
- return;
-
- const dyld3::MachOAnalyzer* ma = (const dyld3::MachOAnalyzer*)machHeader;
-
- auto vmAddrConverter = ma->makeVMAddrConverter(true);
- // HACK: At this point in the builder, everything contains vmAddr's. Setting
- // the above vmAddrConverter as "rebabed" and a 0 slide, causes nothing to be converted later
- vmAddrConverter.slide = 0;
-
- uint64_t binaryCacheOffset = (uint64_t)ma - (uint64_t)dyldCache;
-
- __block std::unordered_map<uint64_t, const char*> symbols;
- if ( log ) {
- uint64_t baseAddress = ma->preferredLoadAddress();
- ma->forEachGlobalSymbol(diags, ^(const char *symbolName, uint64_t n_value, uint8_t n_type, uint8_t n_sect, uint16_t n_desc, bool &stop) {
- symbols[n_value - baseAddress] = symbolName;
- });
- }
-
- ma->forEachSwiftProtocolConformance(diags, vmAddrConverter, true,
- ^(uint64_t protocolConformanceRuntimeOffset, const SwiftProtocolConformance &protocolConformance,
- bool &stopProtocolConformance) {
-
- std::optional<uint16_t> objcIndex = getPreoptimizedHeaderRWIndex(headerInfoRO, headerInfoRW, ma);
- if ( !objcIndex.has_value() ) {
- diags.error("Could not find objc header info for Swift dylib: %s", installName);
- stopProtocolConformance = true;
- return;
- }
-
- uint16_t dylibObjCIndex = *objcIndex;
-
- // The type descriptor might be a pointer to an objc name/class. If so, we need to translate that in to a pointer to a type descriptor
- // For now just skip adding found protocols to objc
- if ( protocolConformance.typeConformanceRuntimeOffset != 0 ) {
- SwiftTypeProtocolConformanceLocation protoLoc;
- protoLoc.protocolConformanceCacheOffset = binaryCacheOffset + protocolConformanceRuntimeOffset;
- protoLoc.dylibObjCIndex = dylibObjCIndex;
- protoLoc.typeDescriptorCacheOffset = binaryCacheOffset + protocolConformance.typeConformanceRuntimeOffset;
- protoLoc.protocolCacheOffset = binaryCacheOffset + protocolConformance.protocolRuntimeOffset;
- foundTypeProtocolConformances.push_back(protoLoc);
- if ( log ) {
- const char* typeName = "";
- const char* protocolName = "";
- const char* conformanceName = "";
- if ( auto it = symbols.find(protocolConformance.typeConformanceRuntimeOffset); it != symbols.end() )
- typeName = it->second;
- if ( auto it = symbols.find(protocolConformance.protocolRuntimeOffset); it != symbols.end() )
- protocolName = it->second;
- if ( auto it = symbols.find(protocolConformanceRuntimeOffset); it != symbols.end() )
- conformanceName = it->second;
- fprintf(stderr, "%s: (%s, %s) -> %s", ma->installName(), typeName, protocolName, conformanceName);
- }
- } else if ( protocolConformance.typeConformanceObjCClassRuntimeOffset != 0 ) {
- SwiftMetadataProtocolConformanceLocation protoLoc;
- protoLoc.protocolConformanceCacheOffset = binaryCacheOffset + protocolConformanceRuntimeOffset;
- protoLoc.dylibObjCIndex = dylibObjCIndex;
- protoLoc.metadataCacheOffset = binaryCacheOffset + protocolConformance.typeConformanceObjCClassRuntimeOffset;
- protoLoc.protocolCacheOffset = binaryCacheOffset + protocolConformance.protocolRuntimeOffset;
- foundMetadataProtocolConformances.push_back(protoLoc);
- if ( log ) {
- const char* metadataName = "";
- const char* protocolName = "";
- const char* conformanceName = "";
- if ( auto it = symbols.find(protocolConformance.typeConformanceObjCClassRuntimeOffset); it != symbols.end() )
- metadataName = it->second;
- if ( auto it = symbols.find(protocolConformance.protocolRuntimeOffset); it != symbols.end() )
- protocolName = it->second;
- if ( auto it = symbols.find(protocolConformanceRuntimeOffset); it != symbols.end() )
- conformanceName = it->second;
- fprintf(stderr, "%s: (%s, %s) -> %s", ma->installName(), metadataName, protocolName, conformanceName);
- }
- } else if ( protocolConformance.typeConformanceObjCClassNameRuntimeOffset != 0 ) {
- const char* className = (const char*)ma + protocolConformance.typeConformanceObjCClassNameRuntimeOffset;
- classHashTable->forEachClass(className, ^(uint64_t classCacheOffset, uint16_t dylibObjCIndexForClass, bool &stopClasses) {
- // exactly one matching class
- SwiftMetadataProtocolConformanceLocation protoLoc;
- protoLoc.protocolConformanceCacheOffset = binaryCacheOffset + protocolConformanceRuntimeOffset;
- protoLoc.dylibObjCIndex = dylibObjCIndex;
- protoLoc.metadataCacheOffset = classCacheOffset;
- protoLoc.protocolCacheOffset = binaryCacheOffset + protocolConformance.protocolRuntimeOffset;
- foundMetadataProtocolConformances.push_back(protoLoc);
- if ( log ) {
- const char* protocolName = "";
- const char* conformanceName = "";
- if ( auto it = symbols.find(protocolConformance.protocolRuntimeOffset); it != symbols.end() )
- protocolName = it->second;
- if ( auto it = symbols.find(protocolConformanceRuntimeOffset); it != symbols.end() )
- conformanceName = it->second;
- fprintf(stderr, "%s: (%s, %s) -> %s", ma->installName(), className, protocolName, conformanceName);
- }
- });
- } else {
- // assert(0 && "Unknown protocol conformance");
- // Missing weak imports can result in us wanting to skip a confornmance. Assume that is the case here
- }
-
- // Type's can also have foreign names, which are used to identify the descriptor by name instead of just pointer value
- if ( protocolConformance.foreignMetadataNameRuntimeOffset != 0 ) {
- uint64_t foreignDescriptorNameCacheOffset = binaryCacheOffset + protocolConformance.foreignMetadataNameRuntimeOffset;
- const char* name = (const char*)dyldCache + foreignDescriptorNameCacheOffset;
- std::string_view fullName(name);
- if ( protocolConformance.foreignMetadataNameHasImportInfo )
- fullName = getForeignFullIdentity(name);
-
- // We only have 16-bits for the length. Hopefully that is enough!
- if ( fullName.size() >= (1 << 16) ) {
- diags.error("Protocol conformance exceeded name length of 16-bits");
- stopProtocolConformance = true;
- return;
- }
-
- SwiftForeignTypeProtocolConformanceLocation protoLoc;
- protoLoc.protocolConformanceCacheOffset = binaryCacheOffset + protocolConformanceRuntimeOffset;
- protoLoc.dylibObjCIndex = dylibObjCIndex;
- protoLoc.foreignDescriptorNameCacheOffset = (fullName.data() - (const char*)dyldCache);
- protoLoc.foreignDescriptorNameLength = fullName.size();
- protoLoc.protocolCacheOffset = binaryCacheOffset + protocolConformance.protocolRuntimeOffset;
- foundForeignTypeProtocolConformances.push_back(protoLoc);
- if ( log ) {
- const char* typeName = "";
- const char* protocolName = "";
- const char* conformanceName = "";
- typeName = (const char*)dyldCache + protoLoc.foreignDescriptorNameCacheOffset;
- if ( auto it = symbols.find(protocolConformance.protocolRuntimeOffset); it != symbols.end() )
- protocolName = it->second;
- if ( auto it = symbols.find(protocolConformanceRuntimeOffset); it != symbols.end() )
- conformanceName = it->second;
- fprintf(stderr, "%s: (%s, %s) -> %s", ma->installName(), typeName, protocolName, conformanceName);
- }
- }
- });
- });
-
- return !diags.hasError();
-}
-
-static bool operator<(const SwiftTypeProtocolConformanceLocation& a,
- const SwiftTypeProtocolConformanceLocation& b) {
- if ( a.typeDescriptorCacheOffset != b.typeDescriptorCacheOffset )
- return a.typeDescriptorCacheOffset < b.typeDescriptorCacheOffset;
- if ( a.protocolCacheOffset != b.protocolCacheOffset )
- return a.protocolCacheOffset < b.protocolCacheOffset;
- if ( a.raw != b.raw )
- return a.raw < b.raw;
- return false;
-}
-
-static bool operator<(const SwiftMetadataProtocolConformanceLocation& a,
- const SwiftMetadataProtocolConformanceLocation& b) {
- if ( a.metadataCacheOffset != b.metadataCacheOffset )
- return a.metadataCacheOffset < b.metadataCacheOffset;
- if ( a.protocolCacheOffset != b.protocolCacheOffset )
- return a.protocolCacheOffset < b.protocolCacheOffset;
- if ( a.raw != b.raw )
- return a.raw < b.raw;
- return false;
-}
-
-static bool operator<(const SwiftForeignTypeProtocolConformanceLocation& a,
- const SwiftForeignTypeProtocolConformanceLocation& b) {
- if ( a.foreignDescriptorNameCacheOffset != b.foreignDescriptorNameCacheOffset )
- return a.foreignDescriptorNameCacheOffset < b.foreignDescriptorNameCacheOffset;
- if ( a.foreignDescriptorNameLength != b.foreignDescriptorNameLength )
- return a.foreignDescriptorNameLength < b.foreignDescriptorNameLength;
- if ( a.protocolCacheOffset != b.protocolCacheOffset )
- return a.protocolCacheOffset < b.protocolCacheOffset;
- if ( a.raw != b.raw )
- return a.raw < b.raw;
- return false;
-}
-
-static void optimizeProtocolConformances(Diagnostics& diags, DyldSharedCache* dyldCache,
- uint8_t* swiftReadOnlyBuffer, uint64_t swiftReadOnlyBufferSizeAllocated)
-{
- std::vector<SwiftTypeProtocolConformanceLocation> foundTypeProtocolConformances;
- std::vector<SwiftMetadataProtocolConformanceLocation> foundMetadataProtocolConformances;
- std::vector<SwiftForeignTypeProtocolConformanceLocation> foundForeignTypeProtocolConformances;
- if ( !findProtocolConformances(diags, dyldCache, foundTypeProtocolConformances, foundMetadataProtocolConformances,
- foundForeignTypeProtocolConformances) )
- return;
-
- // Sort the lists, and look for duplicates
-
- // Types
- std::sort(foundTypeProtocolConformances.begin(), foundTypeProtocolConformances.end());
- for (uint64_t i = 1; i < foundTypeProtocolConformances.size(); ++i) {
- // Check if this protocol is the same as the previous one
- auto& prev = foundTypeProtocolConformances[i - 1];
- auto& current = foundTypeProtocolConformances[i];
- if ( std::equal_to<SwiftTypeProtocolConformanceLocationKey>()(prev, current) )
- prev.nextIsDuplicate = 1;
- }
-
- std::vector<SwiftTypeProtocolConformanceLocationKey> typeProtocolConformanceKeys;
- for (const auto& protoLoc : foundTypeProtocolConformances) {
- if ( protoLoc.nextIsDuplicate )
- continue;
- typeProtocolConformanceKeys.push_back(protoLoc);
- }
-
- // Metadata
- std::sort(foundMetadataProtocolConformances.begin(), foundMetadataProtocolConformances.end());
- for (uint64_t i = 1; i < foundMetadataProtocolConformances.size(); ++i) {
- // Check if this protocol is the same as the previous one
- auto& prev = foundMetadataProtocolConformances[i - 1];
- auto& current = foundMetadataProtocolConformances[i];
- if ( std::equal_to<SwiftMetadataProtocolConformanceLocationKey>()(prev, current) )
- prev.nextIsDuplicate = 1;
- }
-
- std::vector<SwiftMetadataProtocolConformanceLocationKey> metadataProtocolConformanceKeys;
- for (const auto& protoLoc : foundMetadataProtocolConformances) {
- if ( protoLoc.nextIsDuplicate )
- continue;
- metadataProtocolConformanceKeys.push_back(protoLoc);
- }
-
- // Foreign types
- // First unique the offsets so that they all have the same offset for the same name
- {
- std::unordered_map<std::string_view, uint64_t> canonicalForeignNameOffsets;
- for (auto& protoLoc : foundForeignTypeProtocolConformances) {
- uint64_t nameOffset = protoLoc.foreignDescriptorNameCacheOffset;
- const char* name = (const char*)dyldCache + nameOffset;
- // The name might have additional ImportInfo, which may include null characters.
- // The size we calculated earlier includes any necessary null characters
- std::string_view fullName(name, protoLoc.foreignDescriptorNameLength);
- auto itAndInserted = canonicalForeignNameOffsets.insert({ fullName, nameOffset });
- if ( !itAndInserted.second ) {
- // We didn't insert the name, so use the offset already there for this name
- protoLoc.foreignDescriptorNameCacheOffset = itAndInserted.first->second;
- }
- }
- }
-
- std::sort(foundForeignTypeProtocolConformances.begin(), foundForeignTypeProtocolConformances.end());
- for (uint64_t i = 1; i < foundForeignTypeProtocolConformances.size(); ++i) {
- // Check if this protocol is the same as the previous one
- auto& prev = foundForeignTypeProtocolConformances[i - 1];
- auto& current = foundForeignTypeProtocolConformances[i];
- if ( std::equal_to<SwiftForeignTypeProtocolConformanceLocationKey>()(prev, current) )
- prev.nextIsDuplicate = 1;
- }
-
- std::vector<SwiftForeignTypeProtocolConformanceLocationKey> foreignTypeProtocolConformanceKeys;
- for (const auto& protoLoc : foundForeignTypeProtocolConformances) {
- if ( protoLoc.nextIsDuplicate )
- continue;
- foreignTypeProtocolConformanceKeys.push_back(protoLoc);
- }
-
- // Build a map of all found conformances
-
- // Build the perfect hash table for type conformances
- objc::PerfectHash typeConformancePerfectHash;
- make_perfect(typeProtocolConformanceKeys, nullptr, typeConformancePerfectHash);
-
- // Build the perfect hash table for metadata
- objc::PerfectHash metadataConformancePerfectHash;
- make_perfect(metadataProtocolConformanceKeys, nullptr, metadataConformancePerfectHash);
-
- // Build the perfect hash table for foreign types
- objc::PerfectHash foreignTypeConformancePerfectHash;
- make_perfect(foreignTypeProtocolConformanceKeys, (const uint8_t*)dyldCache, foreignTypeConformancePerfectHash);
-
- // Make space for all the hash tables
- uint8_t* bufferStart = swiftReadOnlyBuffer;
- uint8_t* bufferEnd = swiftReadOnlyBuffer + swiftReadOnlyBufferSizeAllocated;
-
- // Add a header
- SwiftOptimizationHeader* swiftOptimizationHeader = (SwiftOptimizationHeader*)swiftReadOnlyBuffer;
- swiftReadOnlyBuffer += sizeof(SwiftOptimizationHeader);
-
- // Make space for the type conformance map
- uint8_t* typeConformanceHashTableBuffer = swiftReadOnlyBuffer;
- size_t typeConformanceHashTableSize = SwiftHashTable::size(typeConformancePerfectHash);
- swiftReadOnlyBuffer += typeConformanceHashTableSize;
-
- // Make space for the metadata conformance map
- uint8_t* metadataConformanceHashTableBuffer = swiftReadOnlyBuffer;
- size_t metadataConformanceHashTableSize = SwiftHashTable::size(metadataConformancePerfectHash);
- swiftReadOnlyBuffer += metadataConformanceHashTableSize;
-
- // Make space for the foreign types conformance map
- uint8_t* foreignTypeConformanceHashTableBuffer = swiftReadOnlyBuffer;
- size_t foreignTypeConformanceHashTableSize = SwiftHashTable::size(foreignTypeConformancePerfectHash);
- swiftReadOnlyBuffer += foreignTypeConformanceHashTableSize;
-
- // Make space for the type conformance structs
- uint8_t* typeConformanceBuffer = swiftReadOnlyBuffer;
- size_t typeConformanceBufferSize = (foundTypeProtocolConformances.size() * sizeof(*foundTypeProtocolConformances.data()));
- swiftReadOnlyBuffer += typeConformanceBufferSize;
-
- // Make space for the metadata conformance structs
- uint8_t* metadataConformanceBuffer = swiftReadOnlyBuffer;
- size_t metadataConformanceBufferSize = (foundMetadataProtocolConformances.size() * sizeof(*foundMetadataProtocolConformances.data()));
- swiftReadOnlyBuffer += metadataConformanceBufferSize;
-
- // Make space for the foreign type conformance structs
- uint8_t* foreignTypeConformanceBuffer = swiftReadOnlyBuffer;
- size_t foreignTypeConformanceBufferSize = (foundForeignTypeProtocolConformances.size() * sizeof(*foundForeignTypeProtocolConformances.data()));
- swiftReadOnlyBuffer += foreignTypeConformanceBufferSize;
-
- // Check for overflow
- if ( swiftReadOnlyBuffer > bufferEnd ) {
- diags.error("Overflow in Swift type hash tables (%lld allocated vs %lld used",
- swiftReadOnlyBufferSizeAllocated, (uint64_t)(swiftReadOnlyBuffer - bufferStart));
- return;
- }
-
- // Write all the hash tables
- dyldCache->header.swiftOptsOffset = (uint64_t)swiftOptimizationHeader - (uint64_t)dyldCache;
- dyldCache->header.swiftOptsSize = (uint64_t)swiftReadOnlyBuffer - (uint64_t)bufferStart;
-
- swiftOptimizationHeader->version = 1;
- swiftOptimizationHeader->padding = 0;
- swiftOptimizationHeader->typeConformanceHashTableCacheOffset = (uint64_t)typeConformanceHashTableBuffer - (uint64_t)dyldCache;
- swiftOptimizationHeader->metadataConformanceHashTableCacheOffset = (uint64_t)metadataConformanceHashTableBuffer - (uint64_t)dyldCache;
- swiftOptimizationHeader->foreignTypeConformanceHashTableCacheOffset = (uint64_t)foreignTypeConformanceHashTableBuffer - (uint64_t)dyldCache;
-
- ((SwiftHashTable*)typeConformanceHashTableBuffer)->write(typeConformancePerfectHash, foundTypeProtocolConformances,
- typeConformanceBuffer, nullptr);
- ((SwiftHashTable*)metadataConformanceHashTableBuffer)->write(metadataConformancePerfectHash, foundMetadataProtocolConformances,
- metadataConformanceBuffer, nullptr);
- ((SwiftHashTable*)foreignTypeConformanceHashTableBuffer)->write(foreignTypeConformancePerfectHash, foundForeignTypeProtocolConformances,
- foreignTypeConformanceBuffer, (const uint8_t*)dyldCache);
- memcpy(typeConformanceBuffer, foundTypeProtocolConformances.data(), typeConformanceBufferSize);
- memcpy(metadataConformanceBuffer, foundMetadataProtocolConformances.data(), metadataConformanceBufferSize);
- memcpy(foreignTypeConformanceBuffer, foundForeignTypeProtocolConformances.data(), foreignTypeConformanceBufferSize);
-
- // Check that the hash tables work!
- for (const auto& target : foundTypeProtocolConformances) {
- const SwiftHashTable* hashTable = (const SwiftHashTable*)typeConformanceHashTableBuffer;
- const auto* protocolTarget = hashTable->getValue<SwiftTypeProtocolConformanceLocation>(target, nullptr);
- assert(protocolTarget != nullptr);
- if ( !protocolTarget->nextIsDuplicate ) {
- // No duplicates, so we should match
- assert(memcmp(protocolTarget, &target, sizeof(SwiftTypeProtocolConformanceLocation)) == 0);
- } else {
- // One of the duplicates should match
- bool foundMatch = false;
- while ( true ) {
- if ( memcmp(protocolTarget, &target, sizeof(SwiftTypeProtocolConformanceLocation)) == 0 ) {
- foundMatch = true;
- break;
- }
- if ( !protocolTarget->nextIsDuplicate )
- break;
- protocolTarget = ++protocolTarget;
- }
- assert(foundMatch);
- }
- }
- for (const auto& target : foundMetadataProtocolConformances) {
- const SwiftHashTable* hashTable = (const SwiftHashTable*)metadataConformanceHashTableBuffer;
- const auto* protocolTarget = hashTable->getValue<SwiftMetadataProtocolConformanceLocation>(target, nullptr);
- assert(protocolTarget != nullptr);
- if ( !protocolTarget->nextIsDuplicate ) {
- // No duplicates, so we should match
- assert(memcmp(protocolTarget, &target, sizeof(SwiftMetadataProtocolConformanceLocation)) == 0);
- } else {
- // One of the duplicates should match
- bool foundMatch = false;
- while ( true ) {
- if ( memcmp(protocolTarget, &target, sizeof(SwiftMetadataProtocolConformanceLocation)) == 0 ) {
- foundMatch = true;
- break;
- }
- if ( !protocolTarget->nextIsDuplicate )
- break;
- protocolTarget = ++protocolTarget;
- }
- assert(foundMatch);
- }
- }
- for (const auto& target : foundForeignTypeProtocolConformances) {
- const SwiftHashTable* hashTable = (const SwiftHashTable*)foreignTypeConformanceHashTableBuffer;
- const auto* protocolTarget = hashTable->getValue<SwiftForeignTypeProtocolConformanceLocation>(target, (const uint8_t*)dyldCache);
- assert(protocolTarget != nullptr);
- if ( !protocolTarget->nextIsDuplicate ) {
- // No duplicates, so we should match
- assert(memcmp(protocolTarget, &target, sizeof(SwiftForeignTypeProtocolConformanceLocation)) == 0);
- } else {
- // One of the duplicates should match
- bool foundMatch = false;
- while ( true ) {
- if ( memcmp(protocolTarget, &target, sizeof(SwiftForeignTypeProtocolConformanceLocation)) == 0 ) {
- foundMatch = true;
- break;
- }
- if ( !protocolTarget->nextIsDuplicate )
- break;
- protocolTarget = ++protocolTarget;
- }
- assert(foundMatch);
- }
- }
- // Check the foreign table again, with a string key, as that is what the SPI will use
- for (const auto& target : foundForeignTypeProtocolConformances) {
- const SwiftHashTable* hashTable = (const SwiftHashTable*)foreignTypeConformanceHashTableBuffer;
-
- const char* typeName = (const char*)dyldCache + target.foreignDescriptorNameCacheOffset;
- assert((const uint8_t*)typeName == target.key1Buffer((const uint8_t*)dyldCache));
- // The type name might include null characters, if it has additional import info
- std::string_view fullName(typeName, target.key1Size());
- SwiftForeignTypeProtocolConformanceLookupKey lookupKey = { fullName, target.protocolCacheOffset };
-
- const auto* protocolTarget = hashTable->getValue<SwiftForeignTypeProtocolConformanceLookupKey, SwiftForeignTypeProtocolConformanceLocation>(lookupKey, (const uint8_t*)dyldCache);
- assert(protocolTarget != nullptr);
- if ( !protocolTarget->nextIsDuplicate ) {
- // No duplicates, so we should match
- assert(memcmp(protocolTarget, &target, sizeof(SwiftForeignTypeProtocolConformanceLocation)) == 0);
- } else {
- // One of the duplicates should match
- bool foundMatch = false;
- while ( true ) {
- if ( memcmp(protocolTarget, &target, sizeof(SwiftForeignTypeProtocolConformanceLocation)) == 0 ) {
- foundMatch = true;
- break;
- }
- if ( !protocolTarget->nextIsDuplicate )
- break;
- protocolTarget = ++protocolTarget;
- }
- assert(foundMatch);
- }
- }
-
- diags.verbose("[Swift]: Wrote %lld bytes of hash tables\n", (uint64_t)(swiftReadOnlyBuffer - bufferStart));
-}
-
-void SharedCacheBuilder::optimizeSwift()
-{
- DyldSharedCache* dyldCache = (DyldSharedCache*)_subCaches.front()._readExecuteRegion.buffer;
-
- // The only thing we do for now is optimize protocols conformances. But we'll put that in
- // its own method just to keep it self-contained
- optimizeProtocolConformances(_diagnostics, dyldCache, _swiftReadOnlyBuffer, _swiftReadOnlyBufferSizeAllocated);
-}
-
-static uint32_t hashTableSize(uint32_t maxElements, uint32_t perElementData)
-{
- uint32_t elementsWithPadding = maxElements*11/10; // if close to power of 2, perfect hash may fail, so don't get within 10% of that
- uint32_t powTwoCapacity = 1 << (32 - __builtin_clz(elementsWithPadding - 1));
- uint32_t headerSize = 4*(8+256);
- return headerSize + powTwoCapacity/2 + powTwoCapacity + powTwoCapacity*perElementData;
-}
-
-// Allocate enough space for the Swift hash tables in the read-only region of the cache
-uint32_t SharedCacheBuilder::computeReadOnlySwift()
-{
- __block uint32_t numTypeConformances = 0;
- __block uint32_t numMetadataConformances = 0;
- __block uint32_t numForeignMetadataConformances = 0;
- for (DylibInfo& dylib : _sortedDylibs) {
- Diagnostics diags;
- dylib.input->mappedFile.mh->forEachSwiftProtocolConformance(diags, dylib.input->mappedFile.mh->makeVMAddrConverter(false), false,
- ^(uint64_t protocolConformanceRuntimeOffset,
- const SwiftProtocolConformance &protocolConformance,
- bool &stopProtocolConformance) {
- if ( protocolConformance.protocolRuntimeOffset != 0 )
- ++numTypeConformances;
- else
- ++numMetadataConformances;
-
- if ( protocolConformance.foreignMetadataNameRuntimeOffset != 0 )
- ++numForeignMetadataConformances;
- });
- }
- // Each conformance entry is 3 uint64_t's internally, plus the space for the hash table
- uint32_t sizeNeeded = 0x4000 * 3;
- sizeNeeded += (numTypeConformances * 3 * sizeof(uint64_t)) + hashTableSize(numTypeConformances, 5);;
- sizeNeeded += (numMetadataConformances * 3 * sizeof(uint64_t)) + hashTableSize(numMetadataConformances, 5);
- sizeNeeded += (numForeignMetadataConformances * 3 * sizeof(uint64_t)) + hashTableSize(numForeignMetadataConformances, 5);
- return sizeNeeded;
-}
-#endif