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ModuleDependencyCacheSerialization.cpp
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//=== ModuleDependencyCacheSerialization.cpp - serialized format -*- C++ -*-==//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/AST/FileSystem.h"
#include "swift/AST/ModuleDependencies.h"
#include "swift/Basic/PrettyStackTrace.h"
#include "swift/Basic/Version.h"
#include "swift/DependencyScan/SerializedModuleDependencyCacheFormat.h"
#include "llvm/ADT/DenseMap.h"
#include <unordered_map>
using namespace swift;
using namespace dependencies;
using namespace module_dependency_cache_serialization;
// MARK: Deserialization
namespace swift {
class ModuleDependenciesCacheDeserializer {
std::vector<std::string> Identifiers;
std::vector<std::vector<uint64_t>> ArraysOfIdentifierIDs;
llvm::BitstreamCursor Cursor;
SmallVector<uint64_t, 64> Scratch;
StringRef BlobData;
// These return true if there was an error.
bool readSignature();
bool enterGraphBlock();
bool readMetadata();
bool readGraph(SwiftDependencyScanningService &cache);
llvm::Optional<std::string> getIdentifier(unsigned n);
llvm::Optional<std::vector<std::string>> getStringArray(unsigned n);
llvm::Optional<std::vector<ModuleDependencyID>> getModuleDependencyIDArray(unsigned n);
public:
ModuleDependenciesCacheDeserializer(llvm::MemoryBufferRef Data) : Cursor(Data) {}
bool readInterModuleDependenciesCache(SwiftDependencyScanningService &cache);
};
} // end namespace
/// Read in the expected signature: IMDC
bool ModuleDependenciesCacheDeserializer::readSignature() {
for (unsigned char byte : MODULE_DEPENDENCY_CACHE_FORMAT_SIGNATURE) {
if (Cursor.AtEndOfStream())
return true;
if (auto maybeRead = Cursor.Read(8)) {
if (maybeRead.get() != byte)
return true;
} else {
return true;
}
}
return false;
}
/// Read in the info block and enter the top-level block which represents the
/// graph
bool ModuleDependenciesCacheDeserializer::enterGraphBlock() {
// Read the BLOCKINFO_BLOCK, which contains metadata used when dumping
// the binary data with llvm-bcanalyzer.
{
auto next = Cursor.advance();
if (!next) {
consumeError(next.takeError());
return true;
}
if (next->Kind != llvm::BitstreamEntry::SubBlock)
return true;
if (next->ID != llvm::bitc::BLOCKINFO_BLOCK_ID)
return true;
if (!Cursor.ReadBlockInfoBlock())
return true;
}
// Enters our top-level subblock,
// which contains the actual module dependency information.
{
auto next = Cursor.advance();
if (!next) {
consumeError(next.takeError());
return true;
}
if (next->Kind != llvm::BitstreamEntry::SubBlock)
return true;
if (next->ID != GRAPH_BLOCK_ID)
return true;
if (auto err = Cursor.EnterSubBlock(GRAPH_BLOCK_ID)) {
consumeError(std::move(err));
return true;
}
}
return false;
}
/// Read in the serialized file's format version, error/exit if not matching
/// current version.
bool ModuleDependenciesCacheDeserializer::readMetadata() {
using namespace graph_block;
auto entry = Cursor.advance();
if (!entry) {
consumeError(entry.takeError());
return true;
}
if (entry->Kind != llvm::BitstreamEntry::Record)
return true;
auto recordID = Cursor.readRecord(entry->ID, Scratch, &BlobData);
if (!recordID) {
consumeError(recordID.takeError());
return true;
}
if (*recordID != METADATA)
return true;
unsigned majorVersion, minorVersion;
MetadataLayout::readRecord(Scratch, majorVersion, minorVersion);
if (majorVersion != MODULE_DEPENDENCY_CACHE_FORMAT_VERSION_MAJOR ||
minorVersion != MODULE_DEPENDENCY_CACHE_FORMAT_VERSION_MINOR) {
return true;
}
return false;
}
/// Read in the top-level block's graph structure by first reading in
/// all of the file's identifiers and arrays of identifiers, followed by
/// consuming individual module info records and registering them into the
/// cache.
bool ModuleDependenciesCacheDeserializer::readGraph(SwiftDependencyScanningService &cache) {
using namespace graph_block;
bool hasCurrentModule = false;
std::string currentModuleName;
unsigned currentContextHashID;
llvm::Optional<std::vector<std::string>> currentModuleImports;
llvm::Optional<std::vector<ModuleDependencyID>> currentModuleDependencyIDs;
auto getContextHash = [&]() {
assert(currentContextHashID &&
"Expected context hash ID for a MODULE_DETAILS_NODE record");
auto contextHash = getIdentifier(currentContextHashID);
if (!contextHash.has_value())
llvm::report_fatal_error("Unexpected MODULE_DETAILS_NODE record");
return contextHash.value();
};
while (!Cursor.AtEndOfStream()) {
auto entry = cantFail(Cursor.advance(), "Advance bitstream cursor");
if (entry.Kind == llvm::BitstreamEntry::EndBlock) {
Cursor.ReadBlockEnd();
assert(Cursor.GetCurrentBitNo() % CHAR_BIT == 0);
break;
}
if (entry.Kind != llvm::BitstreamEntry::Record)
llvm::report_fatal_error("Bad bitstream entry kind");
Scratch.clear();
unsigned recordID =
cantFail(Cursor.readRecord(entry.ID, Scratch, &BlobData),
"Read bitstream record");
switch (recordID) {
case METADATA: {
// METADATA must appear at the beginning and is read by readMetadata().
llvm::report_fatal_error("Unexpected METADATA record");
break;
}
case IDENTIFIER_NODE: {
// IDENTIFIER_NODE must come before MODULE_NODEs.
if (hasCurrentModule)
llvm::report_fatal_error("Unexpected IDENTIFIER_NODE record");
IdentifierNodeLayout::readRecord(Scratch);
Identifiers.push_back(BlobData.str());
break;
}
case IDENTIFIER_ARRAY_NODE: {
// IDENTIFIER_ARRAY_NODE must come before MODULE_NODEs.
if (hasCurrentModule)
llvm::report_fatal_error("Unexpected IDENTIFIER_NODE record");
ArrayRef<uint64_t> identifierIDs;
IdentifierArrayLayout::readRecord(Scratch, identifierIDs);
ArraysOfIdentifierIDs.push_back(identifierIDs.vec());
break;
}
case MODULE_NODE: {
hasCurrentModule = true;
unsigned moduleNameID, contextHashID,
moduleImportsArrayID, moduleDependencyIDArrayID;
ModuleInfoLayout::readRecord(Scratch, moduleNameID, contextHashID,
moduleImportsArrayID,
moduleDependencyIDArrayID);
auto moduleName = getIdentifier(moduleNameID);
if (!moduleName)
llvm::report_fatal_error("Bad module name");
currentModuleName = *moduleName;
currentContextHashID = contextHashID;
currentModuleImports = getStringArray(moduleImportsArrayID);
currentModuleDependencyIDs = getModuleDependencyIDArray(moduleDependencyIDArrayID);
if (!currentModuleImports)
llvm::report_fatal_error("Bad direct dependencies: no imports");
if (!currentModuleDependencyIDs)
llvm::report_fatal_error("Bad direct dependencies: no qualified dependencies");
break;
}
case SWIFT_INTERFACE_MODULE_DETAILS_NODE: {
if (!hasCurrentModule)
llvm::report_fatal_error(
"Unexpected SWIFT_TEXTUAL_MODULE_DETAILS_NODE record");
cache.configureForContextHash(getContextHash());
unsigned outputPathFileID, interfaceFileID, compiledModuleCandidatesArrayID,
buildCommandLineArrayID, extraPCMArgsArrayID, contextHashID,
isFramework, bridgingHeaderFileID, sourceFilesArrayID,
bridgingSourceFilesArrayID, bridgingModuleDependenciesArrayID;
SwiftInterfaceModuleDetailsLayout::readRecord(
Scratch, outputPathFileID, interfaceFileID, compiledModuleCandidatesArrayID,
buildCommandLineArrayID, extraPCMArgsArrayID, contextHashID,
isFramework, bridgingHeaderFileID, sourceFilesArrayID,
bridgingSourceFilesArrayID, bridgingModuleDependenciesArrayID);
auto outputModulePath = getIdentifier(outputPathFileID);
if (!outputModulePath)
llvm::report_fatal_error("Bad .swiftmodule output path");
Optional<std::string> optionalSwiftInterfaceFile;
if (interfaceFileID != 0) {
auto swiftInterfaceFile = getIdentifier(interfaceFileID);
if (!swiftInterfaceFile)
llvm::report_fatal_error("Bad swift interface file path");
optionalSwiftInterfaceFile = *swiftInterfaceFile;
}
auto compiledModuleCandidates = getStringArray(compiledModuleCandidatesArrayID);
if (!compiledModuleCandidates)
llvm::report_fatal_error("Bad compiled module candidates");
auto commandLine = getStringArray(buildCommandLineArrayID);
if (!commandLine)
llvm::report_fatal_error("Bad command line");
auto extraPCMArgs = getStringArray(extraPCMArgsArrayID);
if (!extraPCMArgs)
llvm::report_fatal_error("Bad PCM Args set");
auto contextHash = getIdentifier(contextHashID);
if (!contextHash)
llvm::report_fatal_error("Bad context hash");
// forSwiftInterface API demands references here.
std::vector<StringRef> buildCommandRefs;
for (auto &arg : *commandLine)
buildCommandRefs.push_back(arg);
std::vector<StringRef> extraPCMRefs;
for (auto &arg : *extraPCMArgs)
extraPCMRefs.push_back(arg);
// Form the dependencies storage object
auto moduleDep = ModuleDependencyInfo::forSwiftInterfaceModule(
outputModulePath.value(),
optionalSwiftInterfaceFile.value(), *compiledModuleCandidates,
buildCommandRefs, extraPCMRefs, *contextHash, isFramework);
// Add imports of this module
for (const auto &moduleName : *currentModuleImports)
moduleDep.addModuleImport(moduleName);
// Add qualified dependencies of this module
moduleDep.resolveDependencies(*currentModuleDependencyIDs);
// Add bridging header file path
if (bridgingHeaderFileID != 0) {
auto bridgingHeaderFile = getIdentifier(bridgingHeaderFileID);
if (!bridgingHeaderFile)
llvm::report_fatal_error("Bad bridging header path");
moduleDep.addBridgingHeader(*bridgingHeaderFile);
}
// Add bridging source files
auto bridgingSourceFiles = getStringArray(bridgingSourceFilesArrayID);
if (!bridgingSourceFiles)
llvm::report_fatal_error("Bad bridging source files");
for (const auto &file : *bridgingSourceFiles)
moduleDep.addBridgingSourceFile(file);
// Add source files
auto sourceFiles = getStringArray(sourceFilesArrayID);
if (!sourceFiles)
llvm::report_fatal_error("Bad bridging source files");
for (const auto &file : *sourceFiles)
moduleDep.addSourceFile(file);
// Add bridging module dependencies
auto bridgingModuleDeps = getStringArray(bridgingModuleDependenciesArrayID);
if (!bridgingModuleDeps)
llvm::report_fatal_error("Bad bridging module dependencies");
llvm::StringSet<> alreadyAdded;
for (const auto &mod : *bridgingModuleDeps)
moduleDep.addBridgingModuleDependency(mod, alreadyAdded);
cache.recordDependency(currentModuleName, std::move(moduleDep));
hasCurrentModule = false;
break;
}
case SWIFT_SOURCE_MODULE_DETAILS_NODE: {
if (!hasCurrentModule)
llvm::report_fatal_error(
"Unexpected SWIFT_SOURCE_MODULE_DETAILS_NODE record");
// Expected context hash ID is 0
if (currentContextHashID)
llvm::report_fatal_error(
"Unexpected context hash on MODULE_NODE corresponding to a "
"SWIFT_SOURCE_MODULE_DETAILS_NODE record");
unsigned extraPCMArgsArrayID, bridgingHeaderFileID, sourceFilesArrayID,
bridgingSourceFilesArrayID, bridgingModuleDependenciesArrayID;
SwiftSourceModuleDetailsLayout::readRecord(
Scratch, extraPCMArgsArrayID, bridgingHeaderFileID,
sourceFilesArrayID, bridgingSourceFilesArrayID,
bridgingModuleDependenciesArrayID);
auto extraPCMArgs = getStringArray(extraPCMArgsArrayID);
if (!extraPCMArgs)
llvm::report_fatal_error("Bad PCM Args set");
std::vector<StringRef> extraPCMRefs;
for (auto &arg : *extraPCMArgs)
extraPCMRefs.push_back(arg);
// Form the dependencies storage object
auto moduleDep = ModuleDependencyInfo::forSwiftSourceModule(extraPCMRefs);
// Add dependencies of this module
for (const auto &moduleName : *currentModuleImports)
moduleDep.addModuleImport(moduleName);
// Add bridging header file path
if (bridgingHeaderFileID != 0) {
auto bridgingHeaderFile = getIdentifier(bridgingHeaderFileID);
if (!bridgingHeaderFile)
llvm::report_fatal_error("Bad bridging header path");
moduleDep.addBridgingHeader(*bridgingHeaderFile);
}
// Add bridging source files
auto bridgingSourceFiles = getStringArray(bridgingSourceFilesArrayID);
if (!bridgingSourceFiles)
llvm::report_fatal_error("Bad bridging source files");
for (const auto &file : *bridgingSourceFiles)
moduleDep.addBridgingSourceFile(file);
// Add source files
auto sourceFiles = getStringArray(sourceFilesArrayID);
if (!sourceFiles)
llvm::report_fatal_error("Bad bridging source files");
for (const auto &file : *sourceFiles)
moduleDep.addSourceFile(file);
// Add bridging module dependencies
auto bridgingModuleDeps = getStringArray(bridgingModuleDependenciesArrayID);
if (!bridgingModuleDeps)
llvm::report_fatal_error("Bad bridging module dependencies");
llvm::StringSet<> alreadyAdded;
for (const auto &mod : *bridgingModuleDeps)
moduleDep.addBridgingModuleDependency(mod, alreadyAdded);
cache.recordDependency(currentModuleName, std::move(moduleDep));
hasCurrentModule = false;
break;
}
case SWIFT_BINARY_MODULE_DETAILS_NODE: {
if (!hasCurrentModule)
llvm::report_fatal_error(
"Unexpected SWIFT_BINARY_MODULE_DETAILS_NODE record");
cache.configureForContextHash(getContextHash());
unsigned compiledModulePathID, moduleDocPathID, moduleSourceInfoPathID,
isFramework;
SwiftBinaryModuleDetailsLayout::readRecord(
Scratch, compiledModulePathID, moduleDocPathID,
moduleSourceInfoPathID, isFramework);
auto compiledModulePath = getIdentifier(compiledModulePathID);
if (!compiledModulePath)
llvm::report_fatal_error("Bad compiled module path");
auto moduleDocPath = getIdentifier(moduleDocPathID);
if (!moduleDocPath)
llvm::report_fatal_error("Bad module doc path");
auto moduleSourceInfoPath = getIdentifier(moduleSourceInfoPathID);
if (!moduleSourceInfoPath)
llvm::report_fatal_error("Bad module source info path");
// Form the dependencies storage object
auto moduleDep = ModuleDependencyInfo::forSwiftBinaryModule(
*compiledModulePath, *moduleDocPath, *moduleSourceInfoPath,
isFramework);
// Add dependencies of this module
for (const auto &moduleName : *currentModuleImports)
moduleDep.addModuleImport(moduleName);
cache.recordDependency(currentModuleName, std::move(moduleDep));
hasCurrentModule = false;
break;
}
case SWIFT_PLACEHOLDER_MODULE_DETAILS_NODE: {
if (!hasCurrentModule)
llvm::report_fatal_error(
"Unexpected SWIFT_PLACEHOLDER_MODULE_DETAILS_NODE record");
cache.configureForContextHash(getContextHash());
unsigned compiledModulePathID, moduleDocPathID, moduleSourceInfoPathID;
SwiftPlaceholderModuleDetailsLayout::readRecord(
Scratch, compiledModulePathID, moduleDocPathID,
moduleSourceInfoPathID);
auto compiledModulePath = getIdentifier(compiledModulePathID);
if (!compiledModulePath)
llvm::report_fatal_error("Bad compiled module path");
auto moduleDocPath = getIdentifier(moduleDocPathID);
if (!moduleDocPath)
llvm::report_fatal_error("Bad module doc path");
auto moduleSourceInfoPath = getIdentifier(moduleSourceInfoPathID);
if (!moduleSourceInfoPath)
llvm::report_fatal_error("Bad module source info path");
// Form the dependencies storage object
auto moduleDep = ModuleDependencyInfo::forPlaceholderSwiftModuleStub(
*compiledModulePath, *moduleDocPath, *moduleSourceInfoPath);
// Add dependencies of this module
for (const auto &moduleName : *currentModuleImports)
moduleDep.addModuleImport(moduleName);
cache.recordDependency(currentModuleName, std::move(moduleDep));
hasCurrentModule = false;
break;
}
case CLANG_MODULE_DETAILS_NODE: {
if (!hasCurrentModule)
llvm::report_fatal_error("Unexpected CLANG_MODULE_DETAILS_NODE record");
cache.configureForContextHash(getContextHash());
unsigned pcmOutputPathID, moduleMapPathID, contextHashID, commandLineArrayID,
fileDependenciesArrayID, capturedPCMArgsArrayID;
ClangModuleDetailsLayout::readRecord(Scratch, pcmOutputPathID, moduleMapPathID,
contextHashID, commandLineArrayID,
fileDependenciesArrayID,
capturedPCMArgsArrayID);
auto pcmOutputPath = getIdentifier(pcmOutputPathID);
if (!pcmOutputPath)
llvm::report_fatal_error("Bad pcm output path");
auto moduleMapPath = getIdentifier(moduleMapPathID);
if (!moduleMapPath)
llvm::report_fatal_error("Bad module map path");
auto contextHash = getIdentifier(contextHashID);
if (!contextHash)
llvm::report_fatal_error("Bad context hash");
auto commandLineArgs = getStringArray(commandLineArrayID);
if (!commandLineArgs)
llvm::report_fatal_error("Bad command line");
auto fileDependencies = getStringArray(fileDependenciesArrayID);
if (!fileDependencies)
llvm::report_fatal_error("Bad file dependencies");
auto capturedPCMArgs = getStringArray(capturedPCMArgsArrayID);
if (!capturedPCMArgs)
llvm::report_fatal_error("Bad captured PCM Args");
// Form the dependencies storage object
auto moduleDep = ModuleDependencyInfo::forClangModule(*pcmOutputPath,
*moduleMapPath, *contextHash, *commandLineArgs, *fileDependencies,
*capturedPCMArgs);
// Add dependencies of this module
for (const auto &moduleName : *currentModuleImports)
moduleDep.addModuleImport(moduleName);
cache.recordDependency(currentModuleName, std::move(moduleDep));
hasCurrentModule = false;
break;
}
default: {
llvm::report_fatal_error("Unknown record ID");
}
}
}
return false;
}
bool ModuleDependenciesCacheDeserializer::readInterModuleDependenciesCache(
SwiftDependencyScanningService &cache) {
using namespace graph_block;
if (readSignature())
return true;
if (enterGraphBlock())
return true;
if (readMetadata())
return true;
if (readGraph(cache))
return true;
return false;
}
llvm::Optional<std::string> ModuleDependenciesCacheDeserializer::getIdentifier(unsigned n) {
if (n == 0)
return std::string();
--n;
if (n >= Identifiers.size())
return None;
return Identifiers[n];
}
llvm::Optional<std::vector<std::string>> ModuleDependenciesCacheDeserializer::getStringArray(unsigned n) {
if (n == 0)
return std::vector<std::string>();
--n;
if (n >= ArraysOfIdentifierIDs.size())
return None;
auto &identifierIDs = ArraysOfIdentifierIDs[n];
auto IDtoStringMap = [this](unsigned id) {
auto identifier = getIdentifier(id);
if (!identifier)
llvm::report_fatal_error("Bad identifier array element");
return *identifier;
};
std::vector<std::string> result;
result.reserve(identifierIDs.size());
std::transform(identifierIDs.begin(), identifierIDs.end(),
std::back_inserter(result), IDtoStringMap);
return result;
}
llvm::Optional<std::vector<ModuleDependencyID>> ModuleDependenciesCacheDeserializer::getModuleDependencyIDArray(unsigned n) {
auto encodedIdentifierStringArray = getStringArray(n);
if (encodedIdentifierStringArray.has_value()) {
static const std::string textualPrefix("swiftTextual");
static const std::string binaryPrefix("swiftBinary");
static const std::string placeholderPrefix("swiftPlaceholder");
static const std::string clangPrefix("clang");
std::vector<ModuleDependencyID> result;
for (const auto &encodedIdentifierString : *encodedIdentifierStringArray) {
ModuleDependencyID id;
if (!encodedIdentifierString.compare(0, textualPrefix.size(), textualPrefix)) {
auto moduleName = encodedIdentifierString.substr(textualPrefix.size() + 1);
id = {moduleName, ModuleDependencyKind::SwiftInterface};
} else if (!encodedIdentifierString.compare(0, binaryPrefix.size(), binaryPrefix)) {
auto moduleName = encodedIdentifierString.substr(binaryPrefix.size() + 1);
id = {moduleName, ModuleDependencyKind::SwiftBinary};
} else if (!encodedIdentifierString.compare(0, placeholderPrefix.size(), placeholderPrefix)) {
auto moduleName = encodedIdentifierString.substr(placeholderPrefix.size() + 1);
id = {moduleName, ModuleDependencyKind::SwiftPlaceholder};
} else {
auto moduleName = encodedIdentifierString.substr(clangPrefix.size() + 1);
id = {moduleName, ModuleDependencyKind::Clang};
}
result.push_back(id);
}
return result;
}
return None;
}
bool swift::dependencies::module_dependency_cache_serialization::
readInterModuleDependenciesCache(llvm::MemoryBuffer &buffer,
SwiftDependencyScanningService &cache) {
ModuleDependenciesCacheDeserializer deserializer(buffer.getMemBufferRef());
return deserializer.readInterModuleDependenciesCache(cache);
}
bool swift::dependencies::module_dependency_cache_serialization::
readInterModuleDependenciesCache(StringRef path,
SwiftDependencyScanningService &cache) {
PrettyStackTraceStringAction stackTrace(
"loading inter-module dependency graph", path);
auto buffer = llvm::MemoryBuffer::getFile(path);
if (!buffer)
return true;
return readInterModuleDependenciesCache(*buffer.get(), cache);
}
// MARK: Serialization
/// Kinds of arrays that we track being serialized. Used to query serialized
/// array ID for a given module.
enum ModuleIdentifierArrayKind : uint8_t {
Empty = 0,
DependencyImports,
QualifiedModuleDependencyIDs,
CompiledModuleCandidates,
BuildCommandLine,
ExtraPCMArgs,
SourceFiles,
BridgingSourceFiles,
BridgingModuleDependencies,
NonPathCommandLine,
FileDependencies,
CapturedPCMArgs,
LastArrayKind
};
using ModuleIdentifierArrayKey =
std::pair<ModuleDependencyID, ModuleIdentifierArrayKind>;
// DenseMap Infos for hashing of ModuleIdentifierArrayKind
template <>
struct llvm::DenseMapInfo<ModuleIdentifierArrayKind> {
using UnderlyingType = std::underlying_type<ModuleIdentifierArrayKind>::type;
using UnderlyingInfo = DenseMapInfo<UnderlyingType>;
static inline ModuleIdentifierArrayKind getEmptyKey() {
return ModuleIdentifierArrayKind::Empty;
}
static inline ModuleIdentifierArrayKind getTombstoneKey() {
return ModuleIdentifierArrayKind::LastArrayKind;
}
static unsigned getHashValue(const ModuleIdentifierArrayKind &arrKind) {
auto underlyingValue = static_cast<UnderlyingType>(arrKind);
return UnderlyingInfo::getHashValue(underlyingValue);
}
static bool isEqual(const ModuleIdentifierArrayKind &LHS,
const ModuleIdentifierArrayKind &RHS) {
return LHS == RHS;
}
};
namespace swift {
class ModuleDependenciesCacheSerializer {
llvm::StringMap<unsigned, llvm::BumpPtrAllocator> IdentifierIDs;
std::unordered_map<ModuleDependencyID,
llvm::DenseMap<ModuleIdentifierArrayKind, unsigned>>
ArrayIDs;
unsigned LastIdentifierID = 0;
unsigned LastArrayID = 0;
std::vector<StringRef> Identifiers;
std::vector<std::vector<unsigned>> ArraysOfIdentifiers;
llvm::BitstreamWriter &Out;
/// A reusable buffer for emitting records.
SmallVector<uint64_t, 64> ScratchRecord;
std::array<unsigned, 256> AbbrCodes;
// Returns the identifier ID of the added identifier, either
// new or previously-hashed
unsigned addIdentifier(const std::string &str);
unsigned getIdentifier(const std::string &str) const;
// Returns the array ID of the added array
void addStringArray(ModuleDependencyID moduleID,
ModuleIdentifierArrayKind arrayKind,
const std::vector<std::string> &vec);
void addDependencyIDArray(ModuleDependencyID moduleID,
ModuleIdentifierArrayKind arrayKind,
const std::vector<ModuleDependencyID> &vec);
unsigned getArrayID(ModuleDependencyID moduleID,
ModuleIdentifierArrayKind arrayKind) const;
template <typename Layout>
void registerRecordAbbr() {
using AbbrArrayTy = decltype(AbbrCodes);
static_assert(Layout::Code <= std::tuple_size<AbbrArrayTy>::value,
"layout has invalid record code");
AbbrCodes[Layout::Code] = Layout::emitAbbrev(Out);
}
void collectStringsAndArrays(const SwiftDependencyScanningService &cache);
void emitBlockID(unsigned ID, StringRef name,
SmallVectorImpl<unsigned char> &nameBuffer);
void emitRecordID(unsigned ID, StringRef name,
SmallVectorImpl<unsigned char> &nameBuffer);
void writeSignature();
void writeBlockInfoBlock();
void writeMetadata();
void writeIdentifiers();
void writeArraysOfIdentifiers();
void writeModuleInfo(ModuleDependencyID moduleID,
Optional<std::string> contextHash,
const ModuleDependencyInfo &dependencyInfo);
public:
ModuleDependenciesCacheSerializer(llvm::BitstreamWriter &ExistingOut) : Out(ExistingOut) {}
public:
void
writeInterModuleDependenciesCache(const SwiftDependencyScanningService &cache);
};
} // end namespace
/// Record the name of a block.
void ModuleDependenciesCacheSerializer::emitBlockID(unsigned ID, StringRef name,
SmallVectorImpl<unsigned char> &nameBuffer) {
SmallVector<unsigned, 1> idBuffer;
idBuffer.push_back(ID);
Out.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETBID, idBuffer);
// Emit the block name if present.
if (name.empty())
return;
nameBuffer.resize(name.size());
memcpy(nameBuffer.data(), name.data(), name.size());
Out.EmitRecord(llvm::bitc::BLOCKINFO_CODE_BLOCKNAME, nameBuffer);
}
/// Record the name of a record.
void ModuleDependenciesCacheSerializer::emitRecordID(unsigned ID, StringRef name,
SmallVectorImpl<unsigned char> &nameBuffer) {
assert(ID < 256 && "can't fit record ID in next to name");
nameBuffer.resize(name.size() + 1);
nameBuffer[0] = ID;
memcpy(nameBuffer.data() + 1, name.data(), name.size());
Out.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETRECORDNAME, nameBuffer);
}
void ModuleDependenciesCacheSerializer::writeBlockInfoBlock() {
llvm::BCBlockRAII restoreBlock(Out, llvm::bitc::BLOCKINFO_BLOCK_ID, 2);
SmallVector<unsigned char, 64> nameBuffer;
#define BLOCK(X) emitBlockID(X##_ID, #X, nameBuffer)
#define BLOCK_RECORD(K, X) emitRecordID(K::X, #X, nameBuffer)
BLOCK(GRAPH_BLOCK);
BLOCK_RECORD(graph_block, METADATA);
BLOCK_RECORD(graph_block, IDENTIFIER_NODE);
BLOCK_RECORD(graph_block, IDENTIFIER_ARRAY_NODE);
BLOCK_RECORD(graph_block, MODULE_NODE);
BLOCK_RECORD(graph_block, SWIFT_INTERFACE_MODULE_DETAILS_NODE);
BLOCK_RECORD(graph_block, SWIFT_SOURCE_MODULE_DETAILS_NODE);
BLOCK_RECORD(graph_block, SWIFT_BINARY_MODULE_DETAILS_NODE);
BLOCK_RECORD(graph_block, SWIFT_PLACEHOLDER_MODULE_DETAILS_NODE);
BLOCK_RECORD(graph_block, CLANG_MODULE_DETAILS_NODE);
}
void ModuleDependenciesCacheSerializer::writeSignature() {
for (auto c : MODULE_DEPENDENCY_CACHE_FORMAT_SIGNATURE)
Out.Emit((unsigned)c, 8);
}
void ModuleDependenciesCacheSerializer::writeMetadata() {
using namespace graph_block;
MetadataLayout::emitRecord(Out, ScratchRecord,
AbbrCodes[MetadataLayout::Code],
MODULE_DEPENDENCY_CACHE_FORMAT_VERSION_MAJOR,
MODULE_DEPENDENCY_CACHE_FORMAT_VERSION_MINOR,
version::getSwiftFullVersion());
}
void ModuleDependenciesCacheSerializer::writeIdentifiers() {
using namespace graph_block;
for (auto str : Identifiers) {
IdentifierNodeLayout::emitRecord(
Out, ScratchRecord, AbbrCodes[IdentifierNodeLayout::Code], str);
}
}
void ModuleDependenciesCacheSerializer::writeArraysOfIdentifiers() {
using namespace graph_block;
for (auto vec : ArraysOfIdentifiers) {
IdentifierArrayLayout::emitRecord(
Out, ScratchRecord, AbbrCodes[IdentifierArrayLayout::Code], vec);
}
}
void ModuleDependenciesCacheSerializer::writeModuleInfo(ModuleDependencyID moduleID,
Optional<std::string> contextHash,
const ModuleDependencyInfo &dependencyInfo) {
using namespace graph_block;
auto contextHashStrID = contextHash.has_value() ? getIdentifier(contextHash.value()) : 0;
ModuleInfoLayout::emitRecord(
Out, ScratchRecord, AbbrCodes[ModuleInfoLayout::Code],
getIdentifier(moduleID.first), contextHashStrID,
getArrayID(moduleID, ModuleIdentifierArrayKind::DependencyImports),
getArrayID(moduleID, ModuleIdentifierArrayKind::QualifiedModuleDependencyIDs));
switch (dependencyInfo.getKind()) {
case swift::ModuleDependencyKind::SwiftInterface: {
assert(contextHash.has_value() && "Expected context hash for serializing MODULE_NODE");
auto swiftTextDeps = dependencyInfo.getAsSwiftInterfaceModule();
assert(swiftTextDeps);
unsigned outputModulePathFileId =
getIdentifier(swiftTextDeps->moduleOutputPath);
unsigned swiftInterfaceFileId =
getIdentifier(swiftTextDeps->swiftInterfaceFile);
unsigned bridgingHeaderFileId =
swiftTextDeps->textualModuleDetails.bridgingHeaderFile
? getIdentifier(swiftTextDeps->textualModuleDetails
.bridgingHeaderFile.value())
: 0;
SwiftInterfaceModuleDetailsLayout::emitRecord(
Out, ScratchRecord, AbbrCodes[SwiftInterfaceModuleDetailsLayout::Code],
outputModulePathFileId,
swiftInterfaceFileId,
getArrayID(moduleID, ModuleIdentifierArrayKind::CompiledModuleCandidates),
getArrayID(moduleID, ModuleIdentifierArrayKind::BuildCommandLine),
getArrayID(moduleID, ModuleIdentifierArrayKind::ExtraPCMArgs),
getIdentifier(swiftTextDeps->contextHash),
swiftTextDeps->isFramework,
bridgingHeaderFileId,
getArrayID(moduleID, ModuleIdentifierArrayKind::SourceFiles),
getArrayID(moduleID, ModuleIdentifierArrayKind::BridgingSourceFiles),
getArrayID(moduleID, ModuleIdentifierArrayKind::BridgingModuleDependencies));
break;
}
case swift::ModuleDependencyKind::SwiftSource: {
assert(!contextHash.has_value() &&
"Did not expect context hash for serializing MODULE_NODE");
auto swiftSourceDeps = dependencyInfo.getAsSwiftSourceModule();
assert(swiftSourceDeps);
unsigned bridgingHeaderFileId =
swiftSourceDeps->textualModuleDetails.bridgingHeaderFile
? getIdentifier(swiftSourceDeps->textualModuleDetails
.bridgingHeaderFile.value())
: 0;
SwiftSourceModuleDetailsLayout::emitRecord(
Out, ScratchRecord, AbbrCodes[SwiftSourceModuleDetailsLayout::Code],
getArrayID(moduleID, ModuleIdentifierArrayKind::ExtraPCMArgs),
bridgingHeaderFileId,
getArrayID(moduleID, ModuleIdentifierArrayKind::SourceFiles),
getArrayID(moduleID, ModuleIdentifierArrayKind::BridgingSourceFiles),
getArrayID(moduleID, ModuleIdentifierArrayKind::BridgingModuleDependencies));
break;
}
case swift::ModuleDependencyKind::SwiftBinary: {
assert(contextHash.has_value() && "Expected context hash for serializing MODULE_NODE");
auto swiftBinDeps = dependencyInfo.getAsSwiftBinaryModule();
assert(swiftBinDeps);
SwiftBinaryModuleDetailsLayout::emitRecord(
Out, ScratchRecord, AbbrCodes[SwiftBinaryModuleDetailsLayout::Code],
getIdentifier(swiftBinDeps->compiledModulePath),
getIdentifier(swiftBinDeps->moduleDocPath),
getIdentifier(swiftBinDeps->sourceInfoPath),
swiftBinDeps->isFramework);
break;
}
case swift::ModuleDependencyKind::SwiftPlaceholder: {
assert(contextHash.has_value() && "Expected context hash for serializing MODULE_NODE");
auto swiftPHDeps = dependencyInfo.getAsPlaceholderDependencyModule();
assert(swiftPHDeps);
SwiftPlaceholderModuleDetailsLayout::emitRecord(
Out, ScratchRecord,
AbbrCodes[SwiftPlaceholderModuleDetailsLayout::Code],
getIdentifier(swiftPHDeps->compiledModulePath),
getIdentifier(swiftPHDeps->moduleDocPath),
getIdentifier(swiftPHDeps->sourceInfoPath));
break;
}
case swift::ModuleDependencyKind::Clang: {
assert(contextHash.has_value() && "Expected context hash for serializing MODULE_NODE");
auto clangDeps = dependencyInfo.getAsClangModule();
assert(clangDeps);
ClangModuleDetailsLayout::emitRecord(
Out, ScratchRecord, AbbrCodes[ClangModuleDetailsLayout::Code],
getIdentifier(clangDeps->pcmOutputPath),
getIdentifier(clangDeps->moduleMapFile),
getIdentifier(clangDeps->contextHash),
getArrayID(moduleID, ModuleIdentifierArrayKind::NonPathCommandLine),
getArrayID(moduleID, ModuleIdentifierArrayKind::FileDependencies),
getArrayID(moduleID, ModuleIdentifierArrayKind::CapturedPCMArgs));
break;
}
default:
llvm_unreachable("Unhandled dependency kind.");
}
}
unsigned ModuleDependenciesCacheSerializer::addIdentifier(const std::string &str) {
if (str.empty())
return 0;
decltype(IdentifierIDs)::iterator iter;
bool isNew;
std::tie(iter, isNew) = IdentifierIDs.insert({str, LastIdentifierID + 1});
if (!isNew)
return iter->getValue();
++LastIdentifierID;
// Note that we use the string data stored in the StringMap.
Identifiers.push_back(iter->getKey());
return iter->getValue();
}
unsigned ModuleDependenciesCacheSerializer::getIdentifier(const std::string &str) const {
if (str.empty())
return 0;
auto iter = IdentifierIDs.find(str);
assert(iter != IdentifierIDs.end());
assert(iter->second != 0);
return iter->second;
}
void ModuleDependenciesCacheSerializer::addDependencyIDArray(ModuleDependencyID moduleID,
ModuleIdentifierArrayKind arrayKind,
const std::vector<ModuleDependencyID> &vec) {
std::vector<std::string> encodedDependencyIDs;
for (const auto &moduleID : vec)
encodedDependencyIDs.push_back(createEncodedModuleKindAndName(moduleID));
addStringArray(moduleID, ModuleIdentifierArrayKind::QualifiedModuleDependencyIDs,
encodedDependencyIDs);
return;
}
void ModuleDependenciesCacheSerializer::addStringArray(ModuleDependencyID moduleID,
ModuleIdentifierArrayKind arrayKind,
const std::vector<std::string> &vec) {
if (ArrayIDs.find(moduleID) != ArrayIDs.end()) {
// Already have arrays for this module
llvm::DenseMap<ModuleIdentifierArrayKind, unsigned>::iterator iter;
bool isNew;
std::tie(iter, isNew) =
ArrayIDs[moduleID].insert({arrayKind, LastArrayID + 1});
if (!isNew)
return;
} else {
// Do not yet have any arrays for this module
ArrayIDs[moduleID] = llvm::DenseMap<ModuleIdentifierArrayKind, unsigned>();
ArrayIDs[moduleID].insert({arrayKind, LastArrayID + 1});
}
++LastArrayID;
// Add in the individual identifiers in the array
std::vector<unsigned> identifierIDs;
identifierIDs.reserve(vec.size());
for (const auto &id : vec) {
identifierIDs.push_back(addIdentifier(id));
}
ArraysOfIdentifiers.push_back(identifierIDs);
return;
}
unsigned ModuleDependenciesCacheSerializer::getArrayID(ModuleDependencyID moduleID,
ModuleIdentifierArrayKind arrayKind) const {
auto iter = ArrayIDs.find(moduleID);
assert(iter != ArrayIDs.end());
auto &innerMap = iter->second;
auto arrayIter = innerMap.find(arrayKind);
assert(arrayIter != innerMap.end());
return arrayIter->second;
}
void ModuleDependenciesCacheSerializer::collectStringsAndArrays(
const SwiftDependencyScanningService &cache) {
for (auto &moduleID : cache.getAllSourceModules()) {
assert(moduleID.second == ModuleDependencyKind::SwiftSource &&
"Expected source-based dependency");
auto optionalDependencyInfo =
cache.findSourceModuleDependency(moduleID.first);
assert(optionalDependencyInfo.has_value() && "Expected dependency info.");
auto dependencyInfo = optionalDependencyInfo.value();
// Add the module's name
addIdentifier(moduleID.first);
// Add the module's dependencies
addStringArray(moduleID, ModuleIdentifierArrayKind::DependencyImports,