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487ea14a46
Since the order of the IDs in the AST file (e.g. DeclIDs, SelectorIDs) is not stable, it is not safe to load an AST file that depends on another AST file that has been rebuilt since the importer was built, even if "nothing changed". We previously used size and modtime to check this, but I've seen cases where a module rebuilt quickly enough to foil this check and caused very hard to debug build errors. To save cycles when we're loading the AST, we just generate a random nonce value and check that it hasn't changed when we load an imported module, rather than actually hash the whole file. This is slightly complicated by the fact that we need to verify the signature inside addModule, since we might otherwise consider that a mdoule is "OutOfDate" when really it is the importer that is out of date. I didn't see any regressions in module load time after this change. llvm-svn: 220493
123 lines
4.9 KiB
C++
123 lines
4.9 KiB
C++
//===--- Module.cpp - Module description ------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Module class, which describes a module that has
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// been loaded from an AST file.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Serialization/Module.h"
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#include "ASTReaderInternals.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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using namespace serialization;
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using namespace reader;
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ModuleFile::ModuleFile(ModuleKind Kind, unsigned Generation)
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: Kind(Kind), File(nullptr), Signature(0), DirectlyImported(false),
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Generation(Generation), SizeInBits(0),
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LocalNumSLocEntries(0), SLocEntryBaseID(0),
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SLocEntryBaseOffset(0), SLocEntryOffsets(nullptr),
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LocalNumIdentifiers(0),
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IdentifierOffsets(nullptr), BaseIdentifierID(0),
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IdentifierTableData(nullptr), IdentifierLookupTable(nullptr),
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LocalNumMacros(0), MacroOffsets(nullptr),
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BasePreprocessedEntityID(0),
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PreprocessedEntityOffsets(nullptr), NumPreprocessedEntities(0),
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LocalNumHeaderFileInfos(0),
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HeaderFileInfoTableData(nullptr), HeaderFileInfoTable(nullptr),
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LocalNumSubmodules(0), BaseSubmoduleID(0),
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LocalNumSelectors(0), SelectorOffsets(nullptr), BaseSelectorID(0),
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SelectorLookupTableData(nullptr), SelectorLookupTable(nullptr),
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LocalNumDecls(0), DeclOffsets(nullptr), BaseDeclID(0),
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LocalNumCXXBaseSpecifiers(0), CXXBaseSpecifiersOffsets(nullptr),
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FileSortedDecls(nullptr), NumFileSortedDecls(0),
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RedeclarationsMap(nullptr), LocalNumRedeclarationsInMap(0),
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ObjCCategoriesMap(nullptr), LocalNumObjCCategoriesInMap(0),
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LocalNumTypes(0), TypeOffsets(nullptr), BaseTypeIndex(0)
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{}
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ModuleFile::~ModuleFile() {
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for (DeclContextInfosMap::iterator I = DeclContextInfos.begin(),
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E = DeclContextInfos.end();
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I != E; ++I) {
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if (I->second.NameLookupTableData)
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delete I->second.NameLookupTableData;
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}
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delete static_cast<ASTIdentifierLookupTable *>(IdentifierLookupTable);
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delete static_cast<HeaderFileInfoLookupTable *>(HeaderFileInfoTable);
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delete static_cast<ASTSelectorLookupTable *>(SelectorLookupTable);
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}
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template<typename Key, typename Offset, unsigned InitialCapacity>
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static void
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dumpLocalRemap(StringRef Name,
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const ContinuousRangeMap<Key, Offset, InitialCapacity> &Map) {
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if (Map.begin() == Map.end())
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return;
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typedef ContinuousRangeMap<Key, Offset, InitialCapacity> MapType;
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llvm::errs() << " " << Name << ":\n";
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for (typename MapType::const_iterator I = Map.begin(), IEnd = Map.end();
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I != IEnd; ++I) {
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llvm::errs() << " " << I->first << " -> " << I->second << "\n";
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}
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}
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void ModuleFile::dump() {
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llvm::errs() << "\nModule: " << FileName << "\n";
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if (!Imports.empty()) {
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llvm::errs() << " Imports: ";
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for (unsigned I = 0, N = Imports.size(); I != N; ++I) {
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if (I)
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llvm::errs() << ", ";
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llvm::errs() << Imports[I]->FileName;
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}
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llvm::errs() << "\n";
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}
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// Remapping tables.
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llvm::errs() << " Base source location offset: " << SLocEntryBaseOffset
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<< '\n';
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dumpLocalRemap("Source location offset local -> global map", SLocRemap);
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llvm::errs() << " Base identifier ID: " << BaseIdentifierID << '\n'
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<< " Number of identifiers: " << LocalNumIdentifiers << '\n';
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dumpLocalRemap("Identifier ID local -> global map", IdentifierRemap);
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llvm::errs() << " Base macro ID: " << BaseMacroID << '\n'
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<< " Number of macros: " << LocalNumMacros << '\n';
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dumpLocalRemap("Macro ID local -> global map", MacroRemap);
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llvm::errs() << " Base submodule ID: " << BaseSubmoduleID << '\n'
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<< " Number of submodules: " << LocalNumSubmodules << '\n';
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dumpLocalRemap("Submodule ID local -> global map", SubmoduleRemap);
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llvm::errs() << " Base selector ID: " << BaseSelectorID << '\n'
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<< " Number of selectors: " << LocalNumSelectors << '\n';
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dumpLocalRemap("Selector ID local -> global map", SelectorRemap);
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llvm::errs() << " Base preprocessed entity ID: " << BasePreprocessedEntityID
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<< '\n'
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<< " Number of preprocessed entities: "
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<< NumPreprocessedEntities << '\n';
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dumpLocalRemap("Preprocessed entity ID local -> global map",
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PreprocessedEntityRemap);
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llvm::errs() << " Base type index: " << BaseTypeIndex << '\n'
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<< " Number of types: " << LocalNumTypes << '\n';
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dumpLocalRemap("Type index local -> global map", TypeRemap);
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llvm::errs() << " Base decl ID: " << BaseDeclID << '\n'
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<< " Number of decls: " << LocalNumDecls << '\n';
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dumpLocalRemap("Decl ID local -> global map", DeclRemap);
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}
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