[clang][serialization] Enable ASTWriter to work with Preprocessor only
#115237
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@llvm/pr-subscribers-clang-modules @llvm/pr-subscribers-clang Author: Jan Svoboda (jansvoboda11) ChangesThis PR builds on top of #115235 and makes it possible to call Patch is 46.09 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/115237.diff 7 Files Affected:
diff --git a/clang/include/clang/Serialization/ASTRecordWriter.h b/clang/include/clang/Serialization/ASTRecordWriter.h
index d6090ba1a6c690..67720a0aebc1ca 100644
--- a/clang/include/clang/Serialization/ASTRecordWriter.h
+++ b/clang/include/clang/Serialization/ASTRecordWriter.h
@@ -60,8 +60,9 @@ class ASTRecordWriter
public:
/// Construct a ASTRecordWriter that uses the default encoding scheme.
- ASTRecordWriter(ASTWriter &W, ASTWriter::RecordDataImpl &Record)
- : DataStreamBasicWriter(W.getASTContext()), Writer(&W), Record(&Record) {}
+ ASTRecordWriter(ASTContext &Context, ASTWriter &W,
+ ASTWriter::RecordDataImpl &Record)
+ : DataStreamBasicWriter(Context), Writer(&W), Record(&Record) {}
/// Construct a ASTRecordWriter that uses the same encoding scheme as another
/// ASTRecordWriter.
@@ -208,7 +209,7 @@ class ASTRecordWriter
/// Emit a reference to a type.
void AddTypeRef(QualType T) {
- return Writer->AddTypeRef(T, *Record);
+ return Writer->AddTypeRef(getASTContext(), T, *Record);
}
void writeQualType(QualType T) {
AddTypeRef(T);
diff --git a/clang/include/clang/Serialization/ASTWriter.h b/clang/include/clang/Serialization/ASTWriter.h
index d0e841f367c1e0..7b5b0117874d7a 100644
--- a/clang/include/clang/Serialization/ASTWriter.h
+++ b/clang/include/clang/Serialization/ASTWriter.h
@@ -119,9 +119,6 @@ class ASTWriter : public ASTDeserializationListener,
/// The PCM manager which manages memory buffers for pcm files.
InMemoryModuleCache &ModuleCache;
- /// The ASTContext we're writing.
- ASTContext *Context = nullptr;
-
/// The preprocessor we're writing.
Preprocessor *PP = nullptr;
@@ -545,7 +542,7 @@ class ASTWriter : public ASTDeserializationListener,
unsigned getSubmoduleID(Module *Mod);
/// Write the given subexpression to the bitstream.
- void WriteSubStmt(Stmt *S);
+ void WriteSubStmt(ASTContext &Context, Stmt *S);
void WriteBlockInfoBlock();
void WriteControlBlock(Preprocessor &PP, StringRef isysroot);
@@ -564,34 +561,36 @@ class ASTWriter : public ASTDeserializationListener,
void WriteHeaderSearch(const HeaderSearch &HS);
void WritePreprocessorDetail(PreprocessingRecord &PPRec,
uint64_t MacroOffsetsBase);
- void WriteSubmodules(Module *WritingModule);
+ void WriteSubmodules(Module *WritingModule, ASTContext *Context);
void WritePragmaDiagnosticMappings(const DiagnosticsEngine &Diag,
bool isModule);
unsigned TypeExtQualAbbrev = 0;
void WriteTypeAbbrevs();
- void WriteType(QualType T);
+ void WriteType(ASTContext &Context, QualType T);
bool isLookupResultExternal(StoredDeclsList &Result, DeclContext *DC);
- void GenerateNameLookupTable(const DeclContext *DC,
+ void GenerateNameLookupTable(ASTContext &Context, const DeclContext *DC,
llvm::SmallVectorImpl<char> &LookupTable);
uint64_t WriteDeclContextLexicalBlock(ASTContext &Context,
const DeclContext *DC);
uint64_t WriteDeclContextVisibleBlock(ASTContext &Context, DeclContext *DC);
void WriteTypeDeclOffsets();
void WriteFileDeclIDsMap();
- void WriteComments();
+ void WriteComments(ASTContext &Context);
void WriteSelectors(Sema &SemaRef);
void WriteReferencedSelectorsPool(Sema &SemaRef);
- void WriteIdentifierTable(Preprocessor &PP, IdentifierResolver &IdResolver,
+ void WriteIdentifierTable(Preprocessor &PP, IdentifierResolver *IdResolver,
bool IsModule);
void WriteDeclAndTypes(ASTContext &Context);
void PrepareWritingSpecialDecls(Sema &SemaRef);
void WriteSpecialDeclRecords(Sema &SemaRef);
- void WriteDeclUpdatesBlocks(RecordDataImpl &OffsetsRecord);
- void WriteDeclContextVisibleUpdate(const DeclContext *DC);
+ void WriteDeclUpdatesBlocks(ASTContext &Context,
+ RecordDataImpl &OffsetsRecord);
+ void WriteDeclContextVisibleUpdate(ASTContext &Context,
+ const DeclContext *DC);
void WriteFPPragmaOptions(const FPOptionsOverride &Opts);
void WriteOpenCLExtensions(Sema &SemaRef);
void WriteCUDAPragmas(Sema &SemaRef);
@@ -640,7 +639,7 @@ class ASTWriter : public ASTDeserializationListener,
void WriteDeclAbbrevs();
void WriteDecl(ASTContext &Context, Decl *D);
- ASTFileSignature WriteASTCore(Sema &SemaRef, StringRef isysroot,
+ ASTFileSignature WriteASTCore(Sema *SemaPtr, StringRef isysroot,
Module *WritingModule);
public:
@@ -653,11 +652,6 @@ class ASTWriter : public ASTDeserializationListener,
bool GeneratingReducedBMI = false);
~ASTWriter() override;
- ASTContext &getASTContext() const {
- assert(Context && "requested AST context when not writing AST");
- return *Context;
- }
-
const LangOptions &getLangOpts() const;
/// Get a timestamp for output into the AST file. The actual timestamp
@@ -667,8 +661,8 @@ class ASTWriter : public ASTDeserializationListener,
/// Write a precompiled header for the given semantic analysis.
///
- /// \param SemaRef a reference to the semantic analysis object that processed
- /// the AST to be written into the precompiled header.
+ /// \param Subject The object that processed the input to be written into the
+ /// AST file.
///
/// \param WritingModule The module that we are writing. If null, we are
/// writing a precompiled header.
@@ -679,8 +673,9 @@ class ASTWriter : public ASTDeserializationListener,
///
/// \return the module signature, which eventually will be a hash of
/// the module but currently is merely a random 32-bit number.
- ASTFileSignature WriteAST(Sema &SemaRef, StringRef OutputFile,
- Module *WritingModule, StringRef isysroot,
+ ASTFileSignature WriteAST(llvm::PointerUnion<Sema *, Preprocessor*> Subject,
+ StringRef OutputFile, Module *WritingModule,
+ StringRef isysroot,
bool ShouldCacheASTInMemory = false);
/// Emit a token.
@@ -723,10 +718,10 @@ class ASTWriter : public ASTDeserializationListener,
uint32_t getMacroDirectivesOffset(const IdentifierInfo *Name);
/// Emit a reference to a type.
- void AddTypeRef(QualType T, RecordDataImpl &Record);
+ void AddTypeRef(ASTContext &Context, QualType T, RecordDataImpl &Record);
/// Force a type to be emitted and get its ID.
- serialization::TypeID GetOrCreateTypeID(QualType T);
+ serialization::TypeID GetOrCreateTypeID(ASTContext &Context, QualType T);
/// Find the first local declaration of a given local redeclarable
/// decl.
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 4aec928f9eb0a5..f58e27a7979d1e 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -2359,7 +2359,7 @@ bool ASTUnit::Save(StringRef File) {
static bool serializeUnit(ASTWriter &Writer, SmallVectorImpl<char> &Buffer,
Sema &S, raw_ostream &OS) {
- Writer.WriteAST(S, std::string(), nullptr, "");
+ Writer.WriteAST(&S, std::string(), nullptr, "");
// Write the generated bitstream to "Out".
if (!Buffer.empty())
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index b95e29cbc02515..43fac29f32609c 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -277,8 +277,8 @@ class ASTTypeWriter {
ASTRecordWriter BasicWriter;
public:
- ASTTypeWriter(ASTWriter &Writer)
- : Writer(Writer), BasicWriter(Writer, Record) {}
+ ASTTypeWriter(ASTContext &Context, ASTWriter &Writer)
+ : Writer(Writer), BasicWriter(Context, Writer, Record) {}
uint64_t write(QualType T) {
if (T.hasLocalNonFastQualifiers()) {
@@ -2872,7 +2872,7 @@ static unsigned getNumberOfModules(Module *Mod) {
return ChildModules + 1;
}
-void ASTWriter::WriteSubmodules(Module *WritingModule) {
+void ASTWriter::WriteSubmodules(Module *WritingModule, ASTContext *Context) {
// Enter the submodule description block.
Stream.EnterSubblock(SUBMODULE_BLOCK_ID, /*bits for abbreviations*/5);
@@ -3123,12 +3123,14 @@ void ASTWriter::WriteSubmodules(Module *WritingModule) {
// Emit the reachable initializers.
// The initializer may only be unreachable in reduced BMI.
- RecordData Inits;
- for (Decl *D : Context->getModuleInitializers(Mod))
- if (wasDeclEmitted(D))
- AddDeclRef(D, Inits);
- if (!Inits.empty())
- Stream.EmitRecord(SUBMODULE_INITIALIZERS, Inits);
+ if (Context) {
+ RecordData Inits;
+ for (Decl *D : Context->getModuleInitializers(Mod))
+ if (wasDeclEmitted(D))
+ AddDeclRef(D, Inits);
+ if (!Inits.empty())
+ Stream.EmitRecord(SUBMODULE_INITIALIZERS, Inits);
+ }
// Emit the name of the re-exported module, if any.
if (!Mod->ExportAsModule.empty()) {
@@ -3259,7 +3261,7 @@ void ASTWriter::WritePragmaDiagnosticMappings(const DiagnosticsEngine &Diag,
//===----------------------------------------------------------------------===//
/// Write the representation of a type to the AST stream.
-void ASTWriter::WriteType(QualType T) {
+void ASTWriter::WriteType(ASTContext &Context, QualType T) {
TypeIdx &IdxRef = TypeIdxs[T];
if (IdxRef.getValue() == 0) // we haven't seen this type before.
IdxRef = TypeIdx(0, NextTypeID++);
@@ -3269,7 +3271,8 @@ void ASTWriter::WriteType(QualType T) {
assert(Idx.getValue() >= FirstTypeID && "Writing predefined type");
// Emit the type's representation.
- uint64_t Offset = ASTTypeWriter(*this).write(T) - DeclTypesBlockStartOffset;
+ uint64_t Offset =
+ ASTTypeWriter(Context, *this).write(T) - DeclTypesBlockStartOffset;
// Record the offset for this type.
uint64_t Index = Idx.getValue() - FirstTypeID;
@@ -3393,7 +3396,7 @@ void ASTWriter::WriteFileDeclIDsMap() {
Stream.EmitRecordWithBlob(AbbrevCode, Record, bytes(FileGroupedDeclIDs));
}
-void ASTWriter::WriteComments() {
+void ASTWriter::WriteComments(ASTContext &Context) {
Stream.EnterSubblock(COMMENTS_BLOCK_ID, 3);
auto _ = llvm::make_scope_exit([this] { Stream.ExitBlock(); });
if (!PP->getPreprocessorOpts().WriteCommentListToPCH)
@@ -3406,7 +3409,7 @@ void ASTWriter::WriteComments() {
return;
RecordData Record;
- for (const auto &FO : Context->Comments.OrderedComments) {
+ for (const auto &FO : Context.Comments.OrderedComments) {
for (const auto &OC : FO.second) {
const RawComment *I = OC.second;
Record.clear();
@@ -3656,7 +3659,7 @@ void ASTWriter::WriteReferencedSelectorsPool(Sema &SemaRef) {
return;
RecordData Record;
- ASTRecordWriter Writer(*this, Record);
+ ASTRecordWriter Writer(SemaRef.Context, *this, Record);
// Note: this writes out all references even for a dependent AST. But it is
// very tricky to fix, and given that @selector shouldn't really appear in
@@ -3742,7 +3745,7 @@ bool IsInterestingNonMacroIdentifier(const IdentifierInfo *II,
class ASTIdentifierTableTrait {
ASTWriter &Writer;
Preprocessor &PP;
- IdentifierResolver &IdResolver;
+ IdentifierResolver *IdResolver;
bool IsModule;
bool NeedDecls;
ASTWriter::RecordData *InterestingIdentifierOffsets;
@@ -3767,7 +3770,7 @@ class ASTIdentifierTableTrait {
using offset_type = unsigned;
ASTIdentifierTableTrait(ASTWriter &Writer, Preprocessor &PP,
- IdentifierResolver &IdResolver, bool IsModule,
+ IdentifierResolver *IdResolver, bool IsModule,
ASTWriter::RecordData *InterestingIdentifierOffsets)
: Writer(Writer), PP(PP), IdResolver(IdResolver), IsModule(IsModule),
NeedDecls(!IsModule || !Writer.getLangOpts().CPlusPlus),
@@ -3806,8 +3809,8 @@ class ASTIdentifierTableTrait {
if (MacroOffset)
DataLen += 4; // MacroDirectives offset.
- if (NeedDecls)
- DataLen += std::distance(IdResolver.begin(II), IdResolver.end()) *
+ if (NeedDecls && IdResolver)
+ DataLen += std::distance(IdResolver->begin(II), IdResolver->end()) *
sizeof(DeclID);
}
return emitULEBKeyDataLength(KeyLen, DataLen, Out);
@@ -3845,14 +3848,14 @@ class ASTIdentifierTableTrait {
if (HadMacroDefinition)
LE.write<uint32_t>(MacroOffset);
- if (NeedDecls) {
+ if (NeedDecls && IdResolver) {
// Emit the declaration IDs in reverse order, because the
// IdentifierResolver provides the declarations as they would be
// visible (e.g., the function "stat" would come before the struct
// "stat"), but the ASTReader adds declarations to the end of the list
// (so we need to see the struct "stat" before the function "stat").
// Only emit declarations that aren't from a chained PCH, though.
- SmallVector<NamedDecl *, 16> Decls(IdResolver.decls(II));
+ SmallVector<NamedDecl *, 16> Decls(IdResolver->decls(II));
for (NamedDecl *D : llvm::reverse(Decls))
LE.write<DeclID>((DeclID)Writer.getDeclID(
getDeclForLocalLookup(PP.getLangOpts(), D)));
@@ -3872,7 +3875,7 @@ static bool isLocalIdentifierID(IdentifierID ID) { return !(ID >> 32); }
/// (the actual identifiers themselves) and a separate "offsets" index
/// that maps identifier IDs to locations within the blob.
void ASTWriter::WriteIdentifierTable(Preprocessor &PP,
- IdentifierResolver &IdResolver,
+ IdentifierResolver *IdResolver,
bool IsModule) {
using namespace llvm;
@@ -4137,9 +4140,9 @@ static bool isLookupResultNotInteresting(ASTWriter &Writer,
return true;
}
-void
-ASTWriter::GenerateNameLookupTable(const DeclContext *ConstDC,
- llvm::SmallVectorImpl<char> &LookupTable) {
+void ASTWriter::GenerateNameLookupTable(
+ ASTContext &Context, const DeclContext *ConstDC,
+ llvm::SmallVectorImpl<char> &LookupTable) {
assert(!ConstDC->hasLazyLocalLexicalLookups() &&
!ConstDC->hasLazyExternalLexicalLookups() &&
"must call buildLookups first");
@@ -4234,8 +4237,8 @@ ASTWriter::GenerateNameLookupTable(const DeclContext *ConstDC,
// another declaration in the redecl chain. Any non-implicit constructor or
// conversion function which doesn't occur in all the lexical contexts
// would be an ODR violation.
- auto ImplicitCtorName = Context->DeclarationNames.getCXXConstructorName(
- Context->getCanonicalType(Context->getRecordType(D)));
+ auto ImplicitCtorName = Context.DeclarationNames.getCXXConstructorName(
+ Context.getCanonicalType(Context.getRecordType(D)));
if (ConstructorNameSet.erase(ImplicitCtorName))
Names.push_back(ImplicitCtorName);
@@ -4415,7 +4418,7 @@ uint64_t ASTWriter::WriteDeclContextVisibleBlock(ASTContext &Context,
// Create the on-disk hash table in a buffer.
SmallString<4096> LookupTable;
- GenerateNameLookupTable(DC, LookupTable);
+ GenerateNameLookupTable(Context, DC, LookupTable);
// Write the lookup table
RecordData::value_type Record[] = {DECL_CONTEXT_VISIBLE};
@@ -4431,14 +4434,15 @@ uint64_t ASTWriter::WriteDeclContextVisibleBlock(ASTContext &Context,
/// DeclContext in a dependent AST file. As such, they only exist for the TU
/// (in C++), for namespaces, and for classes with forward-declared unscoped
/// enumeration members (in C++11).
-void ASTWriter::WriteDeclContextVisibleUpdate(const DeclContext *DC) {
+void ASTWriter::WriteDeclContextVisibleUpdate(ASTContext &Context,
+ const DeclContext *DC) {
StoredDeclsMap *Map = DC->getLookupPtr();
if (!Map || Map->empty())
return;
// Create the on-disk hash table in a buffer.
SmallString<4096> LookupTable;
- GenerateNameLookupTable(DC, LookupTable);
+ GenerateNameLookupTable(Context, DC, LookupTable);
// If we're updating a namespace, select a key declaration as the key for the
// update record; those are the only ones that will be checked on reload.
@@ -4753,15 +4757,12 @@ void ASTWriter::AddString(StringRef Str, RecordDataImpl &Record) {
}
bool ASTWriter::PreparePathForOutput(SmallVectorImpl<char> &Path) {
- assert(Context && "should have context when outputting path");
-
// Leave special file names as they are.
StringRef PathStr(Path.data(), Path.size());
if (PathStr == "<built-in>" || PathStr == "<command line>")
return false;
- bool Changed =
- cleanPathForOutput(Context->getSourceManager().getFileManager(), Path);
+ bool Changed = cleanPathForOutput(PP->getFileManager(), Path);
// Remove a prefix to make the path relative, if relevant.
const char *PathBegin = Path.data();
@@ -4850,21 +4851,28 @@ ASTWriter::~ASTWriter() = default;
const LangOptions &ASTWriter::getLangOpts() const {
assert(WritingAST && "can't determine lang opts when not writing AST");
- return Context->getLangOpts();
+ return PP->getLangOpts();
}
time_t ASTWriter::getTimestampForOutput(const FileEntry *E) const {
return IncludeTimestamps ? E->getModificationTime() : 0;
}
-ASTFileSignature ASTWriter::WriteAST(Sema &SemaRef, StringRef OutputFile,
- Module *WritingModule, StringRef isysroot,
- bool ShouldCacheASTInMemory) {
+ASTFileSignature
+ASTWriter::WriteAST(llvm::PointerUnion<Sema *, Preprocessor *> Subject,
+ StringRef OutputFile, Module *WritingModule,
+ StringRef isysroot, bool ShouldCacheASTInMemory) {
llvm::TimeTraceScope scope("WriteAST", OutputFile);
WritingAST = true;
- ASTHasCompilerErrors =
- SemaRef.PP.getDiagnostics().hasUncompilableErrorOccurred();
+ Sema *SemaPtr = Subject.dyn_cast<Sema *>();
+ Preprocessor &PPRef = [&]() -> Preprocessor & {
+ if (SemaPtr)
+ return SemaPtr->getPreprocessor();
+ return *Subject.get<Preprocessor *>();
+ }();
+
+ ASTHasCompilerErrors = PPRef.getDiagnostics().hasUncompilableErrorOccurred();
// Emit the file header.
Stream.Emit((unsigned)'C', 8);
@@ -4874,18 +4882,16 @@ ASTFileSignature ASTWriter::WriteAST(Sema &SemaRef, StringRef OutputFile,
WriteBlockInfoBlock();
- Context = &SemaRef.Context;
- PP = &SemaRef.PP;
+ PP = &PPRef;
this->WritingModule = WritingModule;
- ASTFileSignature Signature = WriteASTCore(SemaRef, isysroot, WritingModule);
- Context = nullptr;
+ ASTFileSignature Signature = WriteASTCore(SemaPtr, isysroot, WritingModule);
PP = nullptr;
this->WritingModule = nullptr;
this->BaseDirectory.clear();
WritingAST = false;
- if (WritingModule && SemaRef.PP.getHeaderSearchInfo()
+ if (WritingModule && PPRef.getHeaderSearchInfo()
.getHeaderSearchOpts()
.ModulesValidateOncePerBuildSession)
updateModuleTimestamp(OutputFile);
@@ -5350,7 +5356,7 @@ void ASTWriter::WriteSpecialDeclRecords(Sema &SemaRef) {
Stream.EmitRecord(VTABLES_TO_EMIT, VTablesToEmit);
}
-ASTFileSignature ASTWriter::WriteASTCore(Sema &SemaRef, StringRef isysroot,
+ASTFileSignature ASTWriter::WriteASTCore(Sema *SemaPtr, StringRef isysroot,
Module *WritingModule) {
using namespace llvm;
@@ -5360,14 +5366,11 @@ ASTFileSignature ASTWriter::WriteASTCore(Sema &SemaRef, StringRef isysroot,
if (Chain)
Chain->finalizeForWriting();
- ASTContext &Context = SemaRef.Context;
- Preprocessor &PP = SemaRef.PP;
-
// This needs to be done very early, since everything that writes
// SourceLocations or FileIDs depends on it.
computeNonAffectingInputFiles();
- writeUnhashedControlBlock(PP);
+ writeUnhashedControlBlock(*PP);
// Don't reuse type ID and Identifier ID from readers for C++ standard named
// modules since we want to support no-transitive-change model for named
@@ -5392,7 +5395,7 @@ ASTFileSignature ASTWriter::WriteASTCore(Sema &SemaRef, StringRef isysroot,
// We do this before emitting any Decl and Types to make sure the
// Identifier ID is stable.
SmallVector<const IdentifierInfo *, 128> IIs;
- for (const auto &ID : PP.getIdentifierTable())
+ for (const auto &ID : PP->getIdentifierTable(...
[truncated]
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✅ With the latest revision this PR passed the C/C++ code formatter. |
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ASTWriter work with Preprocessor onlyASTWriter to work with Preprocessor only
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… only (llvm#115237) This PR builds on top of llvm#115235 and makes it possible to call `ASTWriter::WriteAST()` with `Preprocessor` only instead of full `Sema` object. So far, there are no clients that leverage the new capability - that will come in a follow-up commit. (cherry picked from commit a2f9d1d)
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This patch builds on top of llvm#115237 and llvm#115235, only passing the `Preprocessor` object to `ASTWriter`. This reduces the size of scanning PCM files by 1/3 and speeds up scans by 16%. (cherry picked from commit 25d1ac1)
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… only (llvm#115237) This PR builds on top of llvm#115235 and makes it possible to call `ASTWriter::WriteAST()` with `Preprocessor` only instead of full `Sema` object. So far, there are no clients that leverage the new capability - that will come in a follow-up commit.
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This patch builds on top of llvm#115237 and llvm#115235, only passing the `Preprocessor` object to `ASTWriter`. This reduces the size of scanning PCM files by 1/3 and speeds up scans by 16%.
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This PR builds on top of #115235 and makes it possible to call
ASTWriter::WriteAST()withPreprocessoronly instead of fullSemaobject. So far, there are no clients that leverage the new capability - that will come in a follow-up commit.