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ModuleFileSharedCore.cpp
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//===--- ModuleFileSharedCore.cpp - Core of a serialized module -----------===//
//
// 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 "ModuleFileSharedCore.h"
#include "ModuleFileCoreTableInfo.h"
#include "BCReadingExtras.h"
#include "DeserializationErrors.h"
#include "swift/Basic/LangOptions.h"
#include "swift/Strings.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/OnDiskHashTable.h"
#include "llvm/Support/PrettyStackTrace.h"
using namespace swift;
using namespace swift::serialization;
using namespace llvm::support;
using llvm::Expected;
static bool checkModuleSignature(llvm::BitstreamCursor &cursor,
ArrayRef<unsigned char> signature) {
for (unsigned char byte : signature) {
if (cursor.AtEndOfStream())
return false;
if (Expected<llvm::SimpleBitstreamCursor::word_t> maybeRead =
cursor.Read(8)) {
if (maybeRead.get() != byte)
return false;
} else {
consumeError(maybeRead.takeError());
return false;
}
}
return true;
}
static bool enterTopLevelModuleBlock(llvm::BitstreamCursor &cursor,
unsigned ID,
bool shouldReadBlockInfo = true) {
Expected<llvm::BitstreamEntry> maybeNext = cursor.advance();
if (!maybeNext) {
// FIXME this drops the error on the floor.
consumeError(maybeNext.takeError());
return false;
}
llvm::BitstreamEntry next = maybeNext.get();
if (next.Kind != llvm::BitstreamEntry::SubBlock)
return false;
if (next.ID == llvm::bitc::BLOCKINFO_BLOCK_ID) {
if (shouldReadBlockInfo) {
if (!cursor.ReadBlockInfoBlock())
return false;
} else {
if (cursor.SkipBlock())
return false;
}
return enterTopLevelModuleBlock(cursor, ID, false);
}
if (next.ID != ID)
return false;
if (llvm::Error Err = cursor.EnterSubBlock(ID)) {
// FIXME this drops the error on the floor.
consumeError(std::move(Err));
return false;
}
return true;
}
/// Populate \p extendedInfo with the data from the options block.
///
/// Returns true on success.
static bool readOptionsBlock(llvm::BitstreamCursor &cursor,
SmallVectorImpl<uint64_t> &scratch,
ExtendedValidationInfo &extendedInfo,
PathObfuscator &pathRecoverer) {
while (!cursor.AtEndOfStream()) {
Expected<llvm::BitstreamEntry> maybeEntry = cursor.advance();
if (!maybeEntry) {
// FIXME this drops the error on the floor.
consumeError(maybeEntry.takeError());
return false;
}
llvm::BitstreamEntry entry = maybeEntry.get();
if (entry.Kind == llvm::BitstreamEntry::EndBlock)
break;
if (entry.Kind == llvm::BitstreamEntry::Error)
return false;
if (entry.Kind == llvm::BitstreamEntry::SubBlock) {
// Unknown metadata sub-block, possibly for use by a future version of
// the module format.
if (cursor.SkipBlock())
return false;
continue;
}
scratch.clear();
StringRef blobData;
Expected<unsigned> maybeKind =
cursor.readRecord(entry.ID, scratch, &blobData);
if (!maybeKind) {
// FIXME this drops the error on the floor.
consumeError(maybeKind.takeError());
return false;
}
unsigned kind = maybeKind.get();
switch (kind) {
case options_block::SDK_PATH:
extendedInfo.setSDKPath(pathRecoverer.recover(blobData));
break;
case options_block::XCC:
extendedInfo.addExtraClangImporterOption(blobData);
break;
case options_block::IS_SIB:
bool IsSIB;
options_block::IsSIBLayout::readRecord(scratch, IsSIB);
extendedInfo.setIsSIB(IsSIB);
break;
case options_block::IS_STATIC_LIBRARY:
extendedInfo.setIsStaticLibrary(true);
break;
case options_block::HAS_HERMETIC_SEAL_AT_LINK:
extendedInfo.setHasHermeticSealAtLink(true);
break;
case options_block::IS_TESTABLE:
extendedInfo.setIsTestable(true);
break;
case options_block::ARE_PRIVATE_IMPORTS_ENABLED:
extendedInfo.setPrivateImportsEnabled(true);
break;
case options_block::IS_IMPLICIT_DYNAMIC_ENABLED:
extendedInfo.setImplicitDynamicEnabled(true);
break;
case options_block::RESILIENCE_STRATEGY:
unsigned Strategy;
options_block::ResilienceStrategyLayout::readRecord(scratch, Strategy);
extendedInfo.setResilienceStrategy(ResilienceStrategy(Strategy));
break;
case options_block::IS_ALLOW_MODULE_WITH_COMPILER_ERRORS_ENABLED:
extendedInfo.setAllowModuleWithCompilerErrorsEnabled(true);
break;
case options_block::MODULE_ABI_NAME:
extendedInfo.setModuleABIName(blobData);
break;
case options_block::IS_CONCURRENCY_CHECKED:
extendedInfo.setIsConcurrencyChecked(true);
break;
default:
// Unknown options record, possibly for use by a future version of the
// module format.
break;
}
}
return true;
}
static ValidationInfo validateControlBlock(
llvm::BitstreamCursor &cursor, SmallVectorImpl<uint64_t> &scratch,
std::pair<uint16_t, uint16_t> expectedVersion, bool requiresOSSAModules,
bool requiresRevisionMatch,
StringRef requiredSDK,
ExtendedValidationInfo *extendedInfo,
PathObfuscator &pathRecoverer) {
// The control block is malformed until we've at least read a major version
// number.
ValidationInfo result;
bool versionSeen = false;
bool revisionSeen = false;
while (!cursor.AtEndOfStream()) {
Expected<llvm::BitstreamEntry> maybeEntry = cursor.advance();
if (!maybeEntry) {
// FIXME this drops the error on the floor.
consumeError(maybeEntry.takeError());
result.status = Status::Malformed;
return result;
}
llvm::BitstreamEntry entry = maybeEntry.get();
if (entry.Kind == llvm::BitstreamEntry::EndBlock)
break;
if (entry.Kind == llvm::BitstreamEntry::Error) {
result.status = Status::Malformed;
return result;
}
if (entry.Kind == llvm::BitstreamEntry::SubBlock) {
if (entry.ID == OPTIONS_BLOCK_ID && extendedInfo) {
if (llvm::Error Err = cursor.EnterSubBlock(OPTIONS_BLOCK_ID)) {
// FIXME this drops the error on the floor.
consumeError(std::move(Err));
result.status = Status::Malformed;
return result;
}
if (!readOptionsBlock(cursor, scratch, *extendedInfo, pathRecoverer)) {
result.status = Status::Malformed;
return result;
}
} else {
// Unknown metadata sub-block, possibly for use by a future version of
// the module format.
if (cursor.SkipBlock()) {
result.status = Status::Malformed;
return result;
}
}
continue;
}
scratch.clear();
StringRef blobData;
Expected<unsigned> maybeKind =
cursor.readRecord(entry.ID, scratch, &blobData);
if (!maybeKind) {
// FIXME this drops the error on the floor.
consumeError(maybeKind.takeError());
result.status = Status::Malformed;
return result;
}
unsigned kind = maybeKind.get();
switch (kind) {
case control_block::METADATA: {
if (versionSeen) {
result.status = Status::Malformed;
break;
}
uint16_t versionMajor = scratch[0];
if (versionMajor > expectedVersion.first)
result.status = Status::FormatTooNew;
else if (versionMajor < expectedVersion.first)
result.status = Status::FormatTooOld;
else
result.status = Status::Valid;
// Major version 0 does not have stable minor versions.
if (versionMajor == 0) {
uint16_t versionMinor = scratch[1];
if (versionMinor != expectedVersion.second) {
if (versionMinor < expectedVersion.second)
result.status = Status::FormatTooOld;
else
result.status = Status::FormatTooNew;
}
}
// These fields were added later; be resilient against their absence.
switch (scratch.size()) {
default:
// Add new cases here, in descending order.
case 8:
case 7:
case 6:
case 5: {
auto subMinor = 0;
auto build = 0;
// case 7 and 8 were added after case 5 and 6, so we need to have this
// special handling to make sure we can still load the module without
// case 7 and case 8 successfully.
if (scratch.size() >= 8) {
subMinor = scratch[6];
build = scratch[7];
}
result.userModuleVersion = llvm::VersionTuple(scratch[4], scratch[5],
subMinor, build);
LLVM_FALLTHROUGH;
}
case 4:
if (scratch[3] != 0) {
result.compatibilityVersion =
version::Version(blobData.substr(scratch[2]+1, scratch[3]),
SourceLoc(), nullptr);
}
LLVM_FALLTHROUGH;
case 3:
result.shortVersion = blobData.slice(0, scratch[2]);
LLVM_FALLTHROUGH;
case 2:
case 1:
case 0:
break;
}
result.miscVersion = blobData;
versionSeen = true;
break;
}
case control_block::MODULE_NAME:
result.name = blobData;
break;
case control_block::TARGET:
result.targetTriple = blobData;
break;
case control_block::SDK_NAME: {
result.sdkName = blobData;
// Enable this check for tagged compiler or when the
// env var is set (for testing).
static const char* forceDebugPreSDKRestriction =
::getenv("SWIFT_DEBUG_FORCE_SWIFTMODULE_PER_SDK");
if (!version::isCurrentCompilerTagged() &&
!forceDebugPreSDKRestriction) {
break;
}
// The loaded module was built with a compatible SDK if either:
// * it was the same SDK
// * or one who's name is a prefix of the clients' SDK name. This expects
// that a module built with macOS11 can be used with the macOS11.secret SDK.
// This is generally the case as SDKs with suffixes are a superset of the
// short SDK name equivalent. While this is accepted, this is still not a
// recommended configuration and may lead to unreadable swiftmodules.
StringRef moduleSDK = blobData;
if (!moduleSDK.empty() && !requiredSDK.empty() &&
!requiredSDK.startswith(moduleSDK)) {
result.status = Status::SDKMismatch;
return result;
}
break;
}
case control_block::REVISION: {
revisionSeen = true;
// Tagged compilers should only load modules if they were
// produced by the exact same compiler tag.
// Disable this restriction for compiler testing by setting this
// env var to any value.
static const char* ignoreRevision =
::getenv("SWIFT_DEBUG_IGNORE_SWIFTMODULE_REVISION");
if (ignoreRevision)
break;
// Override this env var for testing, forcing the behavior of a tagged
// compiler and using the env var value to override this compiler's
// revision.
static const char* forcedDebugRevision =
::getenv("SWIFT_DEBUG_FORCE_SWIFTMODULE_REVISION");
bool isCompilerTagged = forcedDebugRevision ||
version::isCurrentCompilerTagged();
StringRef moduleRevision = blobData;
if (isCompilerTagged) {
StringRef compilerRevision = forcedDebugRevision ?
forcedDebugRevision : version::getCurrentCompilerTag();
if (moduleRevision != compilerRevision) {
result.status = Status::RevisionIncompatible;
// We can't trust this module format at this point.
return result;
}
}
break;
}
case control_block::IS_OSSA: {
auto isModuleInOSSA = scratch[0];
if (requiresOSSAModules && !isModuleInOSSA)
result.status = Status::NotInOSSA;
break;
}
default:
// Unknown metadata record, possibly for use by a future version of the
// module format.
break;
}
}
// Last resort check in cases where the format is broken enough that
// we didn't read the REVISION block, report such a case as incompatible.
if (requiresRevisionMatch &&
!revisionSeen &&
result.status == Status::Valid)
result.status = Status::RevisionIncompatible;
return result;
}
static bool validateInputBlock(
llvm::BitstreamCursor &cursor, SmallVectorImpl<uint64_t> &scratch,
SmallVectorImpl<SerializationOptions::FileDependency> &dependencies) {
SmallVector<StringRef, 4> dependencyDirectories;
SmallString<256> dependencyFullPathBuffer;
while (!cursor.AtEndOfStream()) {
Expected<llvm::BitstreamEntry> maybeEntry = cursor.advance();
if (!maybeEntry) {
// FIXME this drops the error on the floor.
consumeError(maybeEntry.takeError());
return true;
}
llvm::BitstreamEntry entry = maybeEntry.get();
if (entry.Kind == llvm::BitstreamEntry::EndBlock)
break;
if (entry.Kind == llvm::BitstreamEntry::Error)
return true;
scratch.clear();
StringRef blobData;
Expected<unsigned> maybeKind =
cursor.readRecord(entry.ID, scratch, &blobData);
if (!maybeKind) {
// FIXME this drops the error on the floor.
consumeError(maybeKind.takeError());
return true;
}
unsigned kind = maybeKind.get();
switch (kind) {
case input_block::FILE_DEPENDENCY: {
bool isHashBased = scratch[2] != 0;
bool isSDKRelative = scratch[3] != 0;
StringRef path = blobData;
size_t directoryIndex = scratch[4];
if (directoryIndex != 0) {
if (directoryIndex > dependencyDirectories.size())
return true;
dependencyFullPathBuffer = dependencyDirectories[directoryIndex-1];
llvm::sys::path::append(dependencyFullPathBuffer, blobData);
path = dependencyFullPathBuffer;
}
if (isHashBased) {
dependencies.push_back(
SerializationOptions::FileDependency::hashBased(
path, isSDKRelative, scratch[0], scratch[1]));
} else {
dependencies.push_back(
SerializationOptions::FileDependency::modTimeBased(
path, isSDKRelative, scratch[0], scratch[1]));
}
break;
}
case input_block::DEPENDENCY_DIRECTORY:
dependencyDirectories.push_back(blobData);
break;
default:
// Unknown metadata record, possibly for use by a future version of the
// module format.
break;
}
}
return false;
}
bool serialization::isSerializedAST(StringRef data) {
StringRef signatureStr(reinterpret_cast<const char *>(SWIFTMODULE_SIGNATURE),
llvm::array_lengthof(SWIFTMODULE_SIGNATURE));
return data.startswith(signatureStr);
}
ValidationInfo serialization::validateSerializedAST(
StringRef data, bool requiresOSSAModules, StringRef requiredSDK,
ExtendedValidationInfo *extendedInfo,
SmallVectorImpl<SerializationOptions::FileDependency> *dependencies) {
ValidationInfo result;
// Check 32-bit alignment.
if (data.size() % SWIFTMODULE_ALIGNMENT != 0 ||
reinterpret_cast<uintptr_t>(data.data()) % SWIFTMODULE_ALIGNMENT != 0)
return result;
llvm::BitstreamCursor cursor(data);
SmallVector<uint64_t, 32> scratch;
if (!checkModuleSignature(cursor, SWIFTMODULE_SIGNATURE) ||
!enterTopLevelModuleBlock(cursor, MODULE_BLOCK_ID, false))
return result;
llvm::BitstreamEntry topLevelEntry;
while (!cursor.AtEndOfStream()) {
Expected<llvm::BitstreamEntry> maybeEntry =
cursor.advance(AF_DontPopBlockAtEnd);
if (!maybeEntry) {
// FIXME this drops the error on the floor.
consumeError(maybeEntry.takeError());
result.status = Status::Malformed;
return result;
}
topLevelEntry = maybeEntry.get();
if (topLevelEntry.Kind != llvm::BitstreamEntry::SubBlock)
break;
if (topLevelEntry.ID == CONTROL_BLOCK_ID) {
if (llvm::Error Err = cursor.EnterSubBlock(CONTROL_BLOCK_ID)) {
// FIXME this drops the error on the floor.
consumeError(std::move(Err));
result.status = Status::Malformed;
return result;
}
PathObfuscator localObfuscator;
result = validateControlBlock(
cursor, scratch,
{SWIFTMODULE_VERSION_MAJOR, SWIFTMODULE_VERSION_MINOR},
requiresOSSAModules, /*requiresRevisionMatch=*/true,
requiredSDK,
extendedInfo, localObfuscator);
if (result.status == Status::Malformed)
return result;
} else if (dependencies &&
result.status == Status::Valid &&
topLevelEntry.ID == INPUT_BLOCK_ID) {
if (llvm::Error Err = cursor.EnterSubBlock(INPUT_BLOCK_ID)) {
// FIXME this drops the error on the floor.
consumeError(std::move(Err));
result.status = Status::Malformed;
return result;
}
if (validateInputBlock(cursor, scratch, *dependencies)) {
result.status = Status::Malformed;
return result;
}
} else {
if (cursor.SkipBlock()) {
result.status = Status::Malformed;
return result;
}
}
}
if (topLevelEntry.Kind == llvm::BitstreamEntry::EndBlock) {
cursor.ReadBlockEnd();
assert(cursor.GetCurrentBitNo() % CHAR_BIT == 0);
result.bytes = cursor.GetCurrentBitNo() / CHAR_BIT;
} else {
result.status = Status::Malformed;
}
return result;
}
std::string ModuleFileSharedCore::Dependency::getPrettyPrintedPath() const {
StringRef pathWithoutScope = RawPath;
if (isScoped()) {
size_t splitPoint = pathWithoutScope.find_last_of('\0');
pathWithoutScope = pathWithoutScope.slice(0, splitPoint);
}
std::string output = pathWithoutScope.str();
std::replace(output.begin(), output.end(), '\0', '.');
return output;
}
void ModuleFileSharedCore::fatal(llvm::Error error) const {
llvm::SmallString<0> errorStr;
llvm::raw_svector_ostream out(errorStr);
out << "*** DESERIALIZATION FAILURE ***\n";
out << "*** If any module named here was modified in the SDK, please delete the ***\n";
out << "*** new swiftmodule files from the SDK and keep only swiftinterfaces. ***\n";
outputDiagnosticInfo(out);
out << "\n";
if (error) {
handleAllErrors(std::move(error), [&](const llvm::ErrorInfoBase &ei) {
ei.log(out);
out << "\n";
});
}
llvm::PrettyStackTraceString trace(errorStr.c_str());
abort();
}
void ModuleFileSharedCore::outputDiagnosticInfo(llvm::raw_ostream &os) const {
os << "module '" << Name << "' with full misc version '" << MiscVersion
<< "'";
if (Bits.IsAllowModuleWithCompilerErrorsEnabled)
os << " (built with -experimental-allow-module-with-compiler-errors)";
}
ModuleFileSharedCore::~ModuleFileSharedCore() { }
std::unique_ptr<ModuleFileSharedCore::SerializedDeclTable>
ModuleFileSharedCore::readDeclTable(ArrayRef<uint64_t> fields,
StringRef blobData) const {
uint32_t tableOffset;
index_block::DeclListLayout::readRecord(fields, tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedDeclTable>;
return OwnedTable(SerializedDeclTable::Create(base + tableOffset,
base + sizeof(uint32_t), base));
}
std::unique_ptr<ModuleFileSharedCore::SerializedExtensionTable>
ModuleFileSharedCore::readExtensionTable(ArrayRef<uint64_t> fields,
StringRef blobData) const {
uint32_t tableOffset;
index_block::DeclListLayout::readRecord(fields, tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedExtensionTable>;
return OwnedTable(SerializedExtensionTable::Create(base + tableOffset,
base + sizeof(uint32_t), base, ExtensionTableInfo(*this)));
}
std::unique_ptr<ModuleFileSharedCore::SerializedLocalDeclTable>
ModuleFileSharedCore::readLocalDeclTable(ArrayRef<uint64_t> fields,
StringRef blobData) const {
uint32_t tableOffset;
index_block::DeclListLayout::readRecord(fields, tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedLocalDeclTable>;
return OwnedTable(SerializedLocalDeclTable::Create(base + tableOffset,
base + sizeof(uint32_t), base));
}
std::unique_ptr<ModuleFileSharedCore::SerializedNestedTypeDeclsTable>
ModuleFileSharedCore::readNestedTypeDeclsTable(ArrayRef<uint64_t> fields,
StringRef blobData) const {
uint32_t tableOffset;
index_block::NestedTypeDeclsLayout::readRecord(fields, tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedNestedTypeDeclsTable>;
return OwnedTable(SerializedNestedTypeDeclsTable::Create(base + tableOffset,
base + sizeof(uint32_t), base));
}
std::unique_ptr<ModuleFileSharedCore::SerializedDeclMemberNamesTable>
ModuleFileSharedCore::readDeclMemberNamesTable(ArrayRef<uint64_t> fields,
StringRef blobData) const {
uint32_t tableOffset;
index_block::DeclMemberNamesLayout::readRecord(fields, tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedDeclMemberNamesTable>;
return OwnedTable(SerializedDeclMemberNamesTable::Create(base + tableOffset,
base + sizeof(uint32_t), base));
}
std::unique_ptr<ModuleFileSharedCore::SerializedDeclMembersTable>
ModuleFileSharedCore::readDeclMembersTable(ArrayRef<uint64_t> fields,
StringRef blobData) const {
uint32_t tableOffset;
decl_member_tables_block::DeclMembersLayout::readRecord(fields,
tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedDeclMembersTable>;
return OwnedTable(SerializedDeclMembersTable::Create(base + tableOffset,
base + sizeof(uint32_t), base));
}
std::unique_ptr<ModuleFileSharedCore::SerializedDeclFingerprintsTable>
ModuleFileSharedCore::readDeclFingerprintsTable(ArrayRef<uint64_t> fields,
StringRef blobData) const {
uint32_t tableOffset;
index_block::DeclFingerprintsLayout::readRecord(fields, tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedDeclFingerprintsTable>;
return OwnedTable(SerializedDeclFingerprintsTable::Create(
base + tableOffset, base + sizeof(uint32_t), base));
}
std::unique_ptr<ModuleFileSharedCore::SerializedObjCMethodTable>
ModuleFileSharedCore::readObjCMethodTable(ArrayRef<uint64_t> fields,
StringRef blobData) const {
uint32_t tableOffset;
index_block::ObjCMethodTableLayout::readRecord(fields, tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedObjCMethodTable>;
return OwnedTable(
SerializedObjCMethodTable::Create(base + tableOffset,
base + sizeof(uint32_t), base));
}
std::unique_ptr<ModuleFileSharedCore::SerializedDerivativeFunctionConfigTable>
ModuleFileSharedCore::readDerivativeFunctionConfigTable(
ArrayRef<uint64_t> fields, StringRef blobData) const {
uint32_t tableOffset;
index_block::DerivativeFunctionConfigTableLayout::readRecord(fields,
tableOffset);
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
using OwnedTable = std::unique_ptr<SerializedDerivativeFunctionConfigTable>;
return OwnedTable(SerializedDerivativeFunctionConfigTable::Create(
base + tableOffset, base + sizeof(uint32_t), base));
}
bool ModuleFileSharedCore::readIndexBlock(llvm::BitstreamCursor &cursor) {
if (llvm::Error Err = cursor.EnterSubBlock(INDEX_BLOCK_ID)) {
// FIXME this drops the error on the floor.
consumeError(std::move(Err));
return false;
}
SmallVector<uint64_t, 4> scratch;
StringRef blobData;
while (!cursor.AtEndOfStream()) {
Expected<llvm::BitstreamEntry> maybeEntry = cursor.advance();
if (!maybeEntry) {
// FIXME this drops the error on the floor.
consumeError(maybeEntry.takeError());
return false;
}
llvm::BitstreamEntry entry = maybeEntry.get();
switch (entry.Kind) {
case llvm::BitstreamEntry::EndBlock:
return true;
case llvm::BitstreamEntry::Error:
return false;
case llvm::BitstreamEntry::SubBlock:
if (entry.ID == DECL_MEMBER_TABLES_BLOCK_ID) {
DeclMemberTablesCursor = cursor;
if (llvm::Error Err = DeclMemberTablesCursor.EnterSubBlock(
DECL_MEMBER_TABLES_BLOCK_ID)) {
// FIXME this drops the error on the floor.
consumeError(std::move(Err));
return false;
}
llvm::BitstreamEntry subentry;
do {
// Scan forward, to load the cursor with any abbrevs we'll need while
// seeking inside this block later.
Expected<llvm::BitstreamEntry> maybeEntry =
DeclMemberTablesCursor.advance(
llvm::BitstreamCursor::AF_DontPopBlockAtEnd);
if (!maybeEntry) {
// FIXME this drops the error on the floor.
consumeError(maybeEntry.takeError());
return false;
}
subentry = maybeEntry.get();
} while (!DeclMemberTablesCursor.AtEndOfStream() &&
subentry.Kind != llvm::BitstreamEntry::Record &&
subentry.Kind != llvm::BitstreamEntry::EndBlock);
}
if (cursor.SkipBlock())
return false;
break;
case llvm::BitstreamEntry::Record:
scratch.clear();
blobData = {};
Expected<unsigned> maybeKind =
cursor.readRecord(entry.ID, scratch, &blobData);
if (!maybeKind) {
// FIXME this drops the error on the floor.
consumeError(maybeKind.takeError());
return false;
}
unsigned kind = maybeKind.get();
switch (kind) {
case index_block::DECL_OFFSETS:
assert(blobData.empty());
allocateBuffer(Decls, scratch);
break;
case index_block::TYPE_OFFSETS:
assert(blobData.empty());
allocateBuffer(Types, scratch);
break;
case index_block::CLANG_TYPE_OFFSETS:
assert(blobData.empty());
allocateBuffer(ClangTypes, scratch);
break;
case index_block::IDENTIFIER_OFFSETS:
assert(blobData.empty());
allocateBuffer(Identifiers, scratch);
break;
case index_block::TOP_LEVEL_DECLS:
TopLevelDecls = readDeclTable(scratch, blobData);
break;
case index_block::OPERATORS:
OperatorDecls = readDeclTable(scratch, blobData);
break;
case index_block::PRECEDENCE_GROUPS:
PrecedenceGroupDecls = readDeclTable(scratch, blobData);
break;
case index_block::EXTENSIONS:
ExtensionDecls = readExtensionTable(scratch, blobData);
break;
case index_block::CLASS_MEMBERS_FOR_DYNAMIC_LOOKUP:
ClassMembersForDynamicLookup = readDeclTable(scratch, blobData);
break;
case index_block::OPERATOR_METHODS:
OperatorMethodDecls = readDeclTable(scratch, blobData);
break;
case index_block::OBJC_METHODS:
ObjCMethods = readObjCMethodTable(scratch, blobData);
break;
case index_block::DERIVATIVE_FUNCTION_CONFIGURATIONS:
DerivativeFunctionConfigurations =
readDerivativeFunctionConfigTable(scratch, blobData);
break;
case index_block::ENTRY_POINT:
assert(blobData.empty());
setEntryPointClassID(scratch.front());
break;
case index_block::ORDERED_TOP_LEVEL_DECLS:
allocateBuffer(OrderedTopLevelDecls, scratch);
break;
case index_block::EXPORTED_PRESPECIALIZATION_DECLS:
allocateBuffer(ExportedPrespecializationDecls, scratch);
break;
case index_block::LOCAL_TYPE_DECLS:
LocalTypeDecls = readLocalDeclTable(scratch, blobData);
break;
case index_block::OPAQUE_RETURN_TYPE_DECLS:
OpaqueReturnTypeDecls = readLocalDeclTable(scratch, blobData);
break;
case index_block::NESTED_TYPE_DECLS:
NestedTypeDecls = readNestedTypeDeclsTable(scratch, blobData);
break;
case index_block::DECL_MEMBER_NAMES:
DeclMemberNames = readDeclMemberNamesTable(scratch, blobData);
break;
case index_block::DECL_FINGERPRINTS:
DeclFingerprints = readDeclFingerprintsTable(scratch, blobData);
break;
case index_block::LOCAL_DECL_CONTEXT_OFFSETS:
assert(blobData.empty());
allocateBuffer(LocalDeclContexts, scratch);
break;
case index_block::GENERIC_SIGNATURE_OFFSETS:
assert(blobData.empty());
allocateBuffer(GenericSignatures, scratch);
break;
case index_block::SUBSTITUTION_MAP_OFFSETS:
assert(blobData.empty());
allocateBuffer(SubstitutionMaps, scratch);
break;
case index_block::PROTOCOL_CONFORMANCE_OFFSETS:
assert(blobData.empty());
allocateBuffer(Conformances, scratch);
break;
case index_block::SIL_LAYOUT_OFFSETS:
assert(blobData.empty());
allocateBuffer(SILLayouts, scratch);
break;
default:
// Unknown index kind, which this version of the compiler won't use.
break;
}
break;
}
}
return false;
}
std::unique_ptr<ModuleFileSharedCore::SerializedDeclCommentTable>
ModuleFileSharedCore::readDeclCommentTable(ArrayRef<uint64_t> fields,
StringRef blobData) const {
if (fields.empty() || blobData.empty())
return nullptr;
uint32_t tableOffset = static_cast<uint32_t>(fields.front());
auto base = reinterpret_cast<const uint8_t *>(blobData.data());
return std::unique_ptr<SerializedDeclCommentTable>(
SerializedDeclCommentTable::Create(base + tableOffset,
base + sizeof(uint32_t), base));
}
std::unique_ptr<ModuleFileSharedCore::GroupNameTable>
ModuleFileSharedCore::readGroupTable(ArrayRef<uint64_t> Fields,
StringRef BlobData) const {
auto pMap = std::make_unique<llvm::DenseMap<unsigned, StringRef>>();
auto Data = reinterpret_cast<const uint8_t *>(BlobData.data());
unsigned GroupCount = endian::readNext<uint32_t, little, unaligned>(Data);
for (unsigned I = 0; I < GroupCount; ++I) {
auto RawSize = endian::readNext<uint32_t, little, unaligned>(Data);
auto RawText = StringRef(reinterpret_cast<const char *>(Data), RawSize);
Data += RawSize;
(*pMap)[I] = RawText;
}
return std::unique_ptr<ModuleFileSharedCore::GroupNameTable>(pMap.release());
}
bool ModuleFileSharedCore::readCommentBlock(llvm::BitstreamCursor &cursor) {
if (llvm::Error Err = cursor.EnterSubBlock(COMMENT_BLOCK_ID)) {
// FIXME this drops the error on the floor.
consumeError(std::move(Err));
return false;
}
SmallVector<uint64_t, 4> scratch;
StringRef blobData;
while (!cursor.AtEndOfStream()) {
Expected<llvm::BitstreamEntry> maybeEntry = cursor.advance();
if (!maybeEntry) {
// FIXME this drops the error on the floor.
consumeError(maybeEntry.takeError());
return false;
}
llvm::BitstreamEntry entry = maybeEntry.get();
switch (entry.Kind) {
case llvm::BitstreamEntry::EndBlock:
return true;
case llvm::BitstreamEntry::Error:
return false;
case llvm::BitstreamEntry::SubBlock:
// Unknown sub-block, which this version of the compiler won't use.
if (cursor.SkipBlock())
return false;
break;
case llvm::BitstreamEntry::Record:
scratch.clear();
Expected<unsigned> maybeKind =
cursor.readRecord(entry.ID, scratch, &blobData);
if (!maybeKind) {
// FIXME this drops the error on the floor.
consumeError(maybeKind.takeError());
return false;
}
unsigned kind = maybeKind.get();
switch (kind) {
case comment_block::DECL_COMMENTS:
DeclCommentTable = readDeclCommentTable(scratch, blobData);
break;
case comment_block::GROUP_NAMES:
GroupNamesMap = readGroupTable(scratch, blobData);
break;
default:
// Unknown index kind, which this version of the compiler won't use.
break;
}
break;
}
}
return false;
}
static Optional<swift::LibraryKind> getActualLibraryKind(unsigned rawKind) {
auto stableKind = static_cast<serialization::LibraryKind>(rawKind);
if (stableKind != rawKind)
return None;
switch (stableKind) {
case serialization::LibraryKind::Library:
return swift::LibraryKind::Library;
case serialization::LibraryKind::Framework:
return swift::LibraryKind::Framework;
}
// If there's a new case value in the module file, ignore it.
return None;
}
static Optional<ModuleDecl::ImportFilterKind>
getActualImportControl(unsigned rawValue) {
// We switch on the raw value rather than the enum in order to handle future
// values.
switch (rawValue) {
case static_cast<unsigned>(serialization::ImportControl::Normal):
return ModuleDecl::ImportFilterKind::Default;
case static_cast<unsigned>(serialization::ImportControl::Exported):
return ModuleDecl::ImportFilterKind::Exported;
case static_cast<unsigned>(serialization::ImportControl::ImplementationOnly):
return ModuleDecl::ImportFilterKind::ImplementationOnly;
default:
return None;
}
}
bool ModuleFileSharedCore::readModuleDocIfPresent(PathObfuscator &pathRecoverer) {
if (!this->ModuleDocInputBuffer)
return true;
llvm::BitstreamCursor docCursor{ModuleDocInputBuffer->getMemBufferRef()};
if (!checkModuleSignature(docCursor, SWIFTDOC_SIGNATURE) ||
!enterTopLevelModuleBlock(docCursor, MODULE_DOC_BLOCK_ID)) {
return false;
}
SmallVector<uint64_t, 64> scratch;
llvm::BitstreamEntry topLevelEntry;