https://github.com/ChuanqiXu9 updated
https://github.com/llvm/llvm-project/pull/92085
>From a2f883278bafb311eb290015a9cf04affeb8d760 Mon Sep 17 00:00:00 2001
From: Chuanqi Xu <yedeng...@linux.alibaba.com>
Date: Tue, 14 May 2024 15:33:12 +0800
Subject: [PATCH] [Serialization] No transitive identifier change
---
.../clang/Lex/ExternalPreprocessorSource.h | 2 +-
.../include/clang/Serialization/ASTBitCodes.h | 2 +-
clang/include/clang/Serialization/ASTReader.h | 19 ++-
.../include/clang/Serialization/ModuleFile.h | 3 -
clang/lib/Serialization/ASTReader.cpp | 96 ++++++++-------
clang/lib/Serialization/ASTWriter.cpp | 56 ++++++---
clang/lib/Serialization/GlobalModuleIndex.cpp | 3 +-
clang/lib/Serialization/ModuleFile.cpp | 1 -
.../no-transitive-identifier-change.cppm | 110 ++++++++++++++++++
9 files changed, 210 insertions(+), 82 deletions(-)
create mode 100644 clang/test/Modules/no-transitive-identifier-change.cppm
diff --git a/clang/include/clang/Lex/ExternalPreprocessorSource.h
b/clang/include/clang/Lex/ExternalPreprocessorSource.h
index 6672ada2ee732..48429948dbffe 100644
--- a/clang/include/clang/Lex/ExternalPreprocessorSource.h
+++ b/clang/include/clang/Lex/ExternalPreprocessorSource.h
@@ -36,7 +36,7 @@ class ExternalPreprocessorSource {
/// Return the identifier associated with the given ID number.
///
/// The ID 0 is associated with the NULL identifier.
- virtual IdentifierInfo *GetIdentifier(unsigned ID) = 0;
+ virtual IdentifierInfo *GetIdentifier(uint64_t ID) = 0;
/// Map a module ID to a module.
virtual Module *getModule(unsigned ModuleID) = 0;
diff --git a/clang/include/clang/Serialization/ASTBitCodes.h
b/clang/include/clang/Serialization/ASTBitCodes.h
index 9f0f900a02914..570b088532414 100644
--- a/clang/include/clang/Serialization/ASTBitCodes.h
+++ b/clang/include/clang/Serialization/ASTBitCodes.h
@@ -59,7 +59,7 @@ const unsigned VERSION_MINOR = 1;
///
/// The ID numbers of identifiers are consecutive (in order of discovery)
/// and start at 1. 0 is reserved for NULL.
-using IdentifierID = uint32_t;
+using IdentifierID = uint64_t;
/// The number of predefined identifier IDs.
const unsigned int NUM_PREDEF_IDENT_IDS = 1;
diff --git a/clang/include/clang/Serialization/ASTReader.h
b/clang/include/clang/Serialization/ASTReader.h
index 480f852e3bf07..0e95d82928459 100644
--- a/clang/include/clang/Serialization/ASTReader.h
+++ b/clang/include/clang/Serialization/ASTReader.h
@@ -661,14 +661,6 @@ class ASTReader
/// been loaded.
std::vector<IdentifierInfo *> IdentifiersLoaded;
- using GlobalIdentifierMapType =
- ContinuousRangeMap<serialization::IdentifierID, ModuleFile *, 4>;
-
- /// Mapping from global identifier IDs to the module in which the
- /// identifier resides along with the offset that should be added to the
- /// global identifier ID to produce a local ID.
- GlobalIdentifierMapType GlobalIdentifierMap;
-
/// A vector containing macros that have already been
/// loaded.
///
@@ -1547,6 +1539,11 @@ class ASTReader
/// Translate a \param GlobalDeclID to the index of DeclsLoaded array.
unsigned translateGlobalDeclIDToIndex(GlobalDeclID ID) const;
+ /// Translate an \param IdentifierID ID to the index of IdentifiersLoaded
+ /// array and the corresponding module file.
+ std::pair<ModuleFile *, unsigned>
+ translateIdentifierIDToIndex(serialization::IdentifierID ID) const;
+
public:
/// Load the AST file and validate its contents against the given
/// Preprocessor.
@@ -2131,7 +2128,7 @@ class ASTReader
/// Load a selector from disk, registering its ID if it exists.
void LoadSelector(Selector Sel);
- void SetIdentifierInfo(unsigned ID, IdentifierInfo *II);
+ void SetIdentifierInfo(serialization::IdentifierID ID, IdentifierInfo *II);
void SetGloballyVisibleDecls(IdentifierInfo *II,
const SmallVectorImpl<GlobalDeclID> &DeclIDs,
SmallVectorImpl<Decl *> *Decls = nullptr);
@@ -2158,10 +2155,10 @@ class ASTReader
return DecodeIdentifierInfo(ID);
}
- IdentifierInfo *getLocalIdentifier(ModuleFile &M, unsigned LocalID);
+ IdentifierInfo *getLocalIdentifier(ModuleFile &M, uint64_t LocalID);
serialization::IdentifierID getGlobalIdentifierID(ModuleFile &M,
- unsigned LocalID);
+ uint64_t LocalID);
void resolvePendingMacro(IdentifierInfo *II, const PendingMacroInfo &PMInfo);
diff --git a/clang/include/clang/Serialization/ModuleFile.h
b/clang/include/clang/Serialization/ModuleFile.h
index 56193d44dd6f3..3787f4eeb8a8b 100644
--- a/clang/include/clang/Serialization/ModuleFile.h
+++ b/clang/include/clang/Serialization/ModuleFile.h
@@ -310,9 +310,6 @@ class ModuleFile {
/// Base identifier ID for identifiers local to this module.
serialization::IdentifierID BaseIdentifierID = 0;
- /// Remapping table for identifier IDs in this module.
- ContinuousRangeMap<uint32_t, int, 2> IdentifierRemap;
-
/// Actual data for the on-disk hash table of identifiers.
///
/// This pointer points into a memory buffer, where the on-disk hash
diff --git a/clang/lib/Serialization/ASTReader.cpp
b/clang/lib/Serialization/ASTReader.cpp
index 0afbc44265370..43013ab61474e 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -954,7 +954,7 @@ ASTSelectorLookupTrait::ReadKey(const unsigned char* d,
unsigned) {
SelectorTable &SelTable = Reader.getContext().Selectors;
unsigned N = endian::readNext<uint16_t, llvm::endianness::little>(d);
const IdentifierInfo *FirstII = Reader.getLocalIdentifier(
- F, endian::readNext<uint32_t, llvm::endianness::little>(d));
+ F, endian::readNext<IdentifierID, llvm::endianness::little>(d));
if (N == 0)
return SelTable.getNullarySelector(FirstII);
else if (N == 1)
@@ -964,7 +964,7 @@ ASTSelectorLookupTrait::ReadKey(const unsigned char* d,
unsigned) {
Args.push_back(FirstII);
for (unsigned I = 1; I != N; ++I)
Args.push_back(Reader.getLocalIdentifier(
- F, endian::readNext<uint32_t, llvm::endianness::little>(d)));
+ F, endian::readNext<IdentifierID, llvm::endianness::little>(d)));
return SelTable.getSelector(N, Args.data());
}
@@ -1047,7 +1047,8 @@ static bool readBit(unsigned &Bits) {
IdentifierID ASTIdentifierLookupTrait::ReadIdentifierID(const unsigned char
*d) {
using namespace llvm::support;
- unsigned RawID = endian::readNext<uint32_t, llvm::endianness::little>(d);
+ IdentifierID RawID =
+ endian::readNext<IdentifierID, llvm::endianness::little>(d);
return Reader.getGlobalIdentifierID(F, RawID >> 1);
}
@@ -1065,9 +1066,12 @@ IdentifierInfo *ASTIdentifierLookupTrait::ReadData(const
internal_key_type& k,
unsigned DataLen) {
using namespace llvm::support;
- unsigned RawID = endian::readNext<uint32_t, llvm::endianness::little>(d);
+ IdentifierID RawID =
+ endian::readNext<IdentifierID, llvm::endianness::little>(d);
bool IsInteresting = RawID & 0x01;
+ DataLen -= sizeof(IdentifierID);
+
// Wipe out the "is interesting" bit.
RawID = RawID >> 1;
@@ -1098,7 +1102,7 @@ IdentifierInfo *ASTIdentifierLookupTrait::ReadData(const
internal_key_type& k,
bool HadMacroDefinition = readBit(Bits);
assert(Bits == 0 && "Extra bits in the identifier?");
- DataLen -= 8;
+ DataLen -= sizeof(uint16_t) * 2;
// Set or check the various bits in the IdentifierInfo structure.
// Token IDs are read-only.
@@ -1225,7 +1229,7 @@ ASTDeclContextNameLookupTrait::ReadKey(const unsigned
char *d, unsigned) {
case DeclarationName::CXXLiteralOperatorName:
case DeclarationName::CXXDeductionGuideName:
Data = (uint64_t)Reader.getLocalIdentifier(
- F, endian::readNext<uint32_t, llvm::endianness::little>(d));
+ F, endian::readNext<IdentifierID, llvm::endianness::little>(d));
break;
case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
@@ -2093,7 +2097,7 @@ HeaderFileInfoTrait::ReadData(internal_key_ref key, const
unsigned char *d,
HFI.DirInfo = (Flags >> 1) & 0x07;
HFI.IndexHeaderMapHeader = Flags & 0x01;
HFI.LazyControllingMacro = Reader.getGlobalIdentifierID(
- M, endian::readNext<uint32_t, llvm::endianness::little>(d));
+ M, endian::readNext<IdentifierID, llvm::endianness::little>(d));
if (unsigned FrameworkOffset =
endian::readNext<uint32_t, llvm::endianness::little>(d)) {
// The framework offset is 1 greater than the actual offset,
@@ -3467,24 +3471,11 @@ llvm::Error ASTReader::ReadASTBlock(ModuleFile &F,
"duplicate IDENTIFIER_OFFSET record in AST file");
F.IdentifierOffsets = (const uint32_t *)Blob.data();
F.LocalNumIdentifiers = Record[0];
- unsigned LocalBaseIdentifierID = Record[1];
F.BaseIdentifierID = getTotalNumIdentifiers();
- if (F.LocalNumIdentifiers > 0) {
- // Introduce the global -> local mapping for identifiers within this
- // module.
- GlobalIdentifierMap.insert(std::make_pair(getTotalNumIdentifiers() + 1,
- &F));
-
- // Introduce the local -> global mapping for identifiers within this
- // module.
- F.IdentifierRemap.insertOrReplace(
- std::make_pair(LocalBaseIdentifierID,
- F.BaseIdentifierID - LocalBaseIdentifierID));
-
+ if (F.LocalNumIdentifiers > 0)
IdentifiersLoaded.resize(IdentifiersLoaded.size()
+ F.LocalNumIdentifiers);
- }
break;
}
@@ -4089,7 +4080,6 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F) const {
F.ModuleOffsetMap = StringRef();
using RemapBuilder = ContinuousRangeMap<uint32_t, int, 2>::Builder;
- RemapBuilder IdentifierRemap(F.IdentifierRemap);
RemapBuilder MacroRemap(F.MacroRemap);
RemapBuilder PreprocessedEntityRemap(F.PreprocessedEntityRemap);
RemapBuilder SubmoduleRemap(F.SubmoduleRemap);
@@ -4122,8 +4112,6 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F) const {
ImportedModuleVector.push_back(OM);
- uint32_t IdentifierIDOffset =
- endian::readNext<uint32_t, llvm::endianness::little>(Data);
uint32_t MacroIDOffset =
endian::readNext<uint32_t, llvm::endianness::little>(Data);
uint32_t PreprocessedEntityIDOffset =
@@ -4143,7 +4131,6 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F) const {
static_cast<int>(BaseOffset - Offset)));
};
- mapOffset(IdentifierIDOffset, OM->BaseIdentifierID, IdentifierRemap);
mapOffset(MacroIDOffset, OM->BaseMacroID, MacroRemap);
mapOffset(PreprocessedEntityIDOffset, OM->BasePreprocessedEntityID,
PreprocessedEntityRemap);
@@ -8238,7 +8225,6 @@ LLVM_DUMP_METHOD void ASTReader::dump() {
dumpModuleIDMap("Global bit offset map", GlobalBitOffsetsMap);
dumpModuleIDMap("Global source location entry map", GlobalSLocEntryMap);
dumpModuleIDMap("Global type map", GlobalTypeMap);
- dumpModuleIDMap("Global identifier map", GlobalIdentifierMap);
dumpModuleIDMap("Global macro map", GlobalMacroMap);
dumpModuleIDMap("Global submodule map", GlobalSubmoduleMap);
dumpModuleIDMap("Global selector map", GlobalSelectorMap);
@@ -8878,8 +8864,9 @@ void ASTReader::LoadSelector(Selector Sel) {
void ASTReader::SetIdentifierInfo(IdentifierID ID, IdentifierInfo *II) {
assert(ID && "Non-zero identifier ID required");
- assert(ID <= IdentifiersLoaded.size() && "identifier ID out of range");
- IdentifiersLoaded[ID - 1] = II;
+ unsigned Index = translateIdentifierIDToIndex(ID).second;
+ assert(Index < IdentifiersLoaded.size() && "identifier ID out of range");
+ IdentifiersLoaded[Index] = II;
if (DeserializationListener)
DeserializationListener->IdentifierRead(ID, II);
}
@@ -8932,6 +8919,22 @@ void ASTReader::SetGloballyVisibleDecls(
}
}
+std::pair<ModuleFile *, unsigned>
+ASTReader::translateIdentifierIDToIndex(IdentifierID ID) const {
+ if (ID == 0)
+ return {nullptr, 0};
+
+ unsigned ModuleFileIndex = ID >> 32;
+ unsigned LocalID = ID & llvm::maskTrailingOnes<IdentifierID>(32);
+
+ assert(ModuleFileIndex && "not translating loaded IdentifierID?");
+ assert(getModuleManager().size() > ModuleFileIndex - 1);
+
+ ModuleFile &MF = getModuleManager()[ModuleFileIndex - 1];
+ assert(LocalID < MF.LocalNumIdentifiers);
+ return {&MF, MF.BaseIdentifierID + LocalID};
+}
+
IdentifierInfo *ASTReader::DecodeIdentifierInfo(IdentifierID ID) {
if (ID == 0)
return nullptr;
@@ -8941,45 +8944,48 @@ IdentifierInfo
*ASTReader::DecodeIdentifierInfo(IdentifierID ID) {
return nullptr;
}
- ID -= 1;
- if (!IdentifiersLoaded[ID]) {
- GlobalIdentifierMapType::iterator I = GlobalIdentifierMap.find(ID + 1);
- assert(I != GlobalIdentifierMap.end() && "Corrupted global identifier
map");
- ModuleFile *M = I->second;
- unsigned Index = ID - M->BaseIdentifierID;
+ auto [M, Index] = translateIdentifierIDToIndex(ID);
+ if (!IdentifiersLoaded[Index]) {
+ assert(M != nullptr && "Untranslated Identifier ID?");
+ assert(Index >= M->BaseIdentifierID);
+ unsigned LocalIndex = Index - M->BaseIdentifierID;
const unsigned char *Data =
- M->IdentifierTableData + M->IdentifierOffsets[Index];
+ M->IdentifierTableData + M->IdentifierOffsets[LocalIndex];
ASTIdentifierLookupTrait Trait(*this, *M);
auto KeyDataLen = Trait.ReadKeyDataLength(Data);
auto Key = Trait.ReadKey(Data, KeyDataLen.first);
auto &II = PP.getIdentifierTable().get(Key);
- IdentifiersLoaded[ID] = &II;
+ IdentifiersLoaded[Index] = &II;
markIdentifierFromAST(*this, II);
if (DeserializationListener)
- DeserializationListener->IdentifierRead(ID + 1, &II);
+ DeserializationListener->IdentifierRead(ID, &II);
}
- return IdentifiersLoaded[ID];
+ return IdentifiersLoaded[Index];
}
-IdentifierInfo *ASTReader::getLocalIdentifier(ModuleFile &M, unsigned LocalID)
{
+IdentifierInfo *ASTReader::getLocalIdentifier(ModuleFile &M, uint64_t LocalID)
{
return DecodeIdentifierInfo(getGlobalIdentifierID(M, LocalID));
}
-IdentifierID ASTReader::getGlobalIdentifierID(ModuleFile &M, unsigned LocalID)
{
+IdentifierID ASTReader::getGlobalIdentifierID(ModuleFile &M, uint64_t LocalID)
{
if (LocalID < NUM_PREDEF_IDENT_IDS)
return LocalID;
if (!M.ModuleOffsetMap.empty())
ReadModuleOffsetMap(M);
- ContinuousRangeMap<uint32_t, int, 2>::iterator I
- = M.IdentifierRemap.find(LocalID - NUM_PREDEF_IDENT_IDS);
- assert(I != M.IdentifierRemap.end()
- && "Invalid index into identifier index remap");
+ unsigned ModuleFileIndex = LocalID >> 32;
+ LocalID &= llvm::maskTrailingOnes<IdentifierID>(32);
+ ModuleFile *MF =
+ ModuleFileIndex ? M.TransitiveImports[ModuleFileIndex - 1] : &M;
+ assert(MF && "malformed identifier ID encoding?");
- return LocalID + I->second;
+ if (!ModuleFileIndex)
+ LocalID -= NUM_PREDEF_IDENT_IDS;
+
+ return ((IdentifierID)(MF->Index + 1) << 32) | LocalID;
}
MacroInfo *ASTReader::getMacro(MacroID ID) {
diff --git a/clang/lib/Serialization/ASTWriter.cpp
b/clang/lib/Serialization/ASTWriter.cpp
index a60092a48edbe..346bab34acb5e 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -1993,7 +1993,7 @@ namespace {
std::pair<unsigned, unsigned>
EmitKeyDataLength(raw_ostream& Out, key_type_ref key, data_type_ref Data) {
unsigned KeyLen = key.Filename.size() + 1 + 8 + 8;
- unsigned DataLen = 1 + 4 + 4;
+ unsigned DataLen = 1 + sizeof(IdentifierID) + 4;
for (auto ModInfo : Data.KnownHeaders)
if (Writer.getLocalOrImportedSubmoduleID(ModInfo.getModule()))
DataLen += 4;
@@ -3461,7 +3461,9 @@ class ASTMethodPoolTrait {
std::pair<unsigned, unsigned>
EmitKeyDataLength(raw_ostream& Out, Selector Sel,
data_type_ref Methods) {
- unsigned KeyLen = 2 + (Sel.getNumArgs()? Sel.getNumArgs() * 4 : 4);
+ unsigned KeyLen =
+ 2 + (Sel.getNumArgs() ? Sel.getNumArgs() * sizeof(IdentifierID)
+ : sizeof(IdentifierID));
unsigned DataLen = 4 + 2 + 2; // 2 bytes for each of the method counts
for (const ObjCMethodList *Method = &Methods.Instance; Method;
Method = Method->getNext())
@@ -3486,7 +3488,7 @@ class ASTMethodPoolTrait {
if (N == 0)
N = 1;
for (unsigned I = 0; I != N; ++I)
- LE.write<uint32_t>(
+ LE.write<IdentifierID>(
Writer.getIdentifierRef(Sel.getIdentifierInfoForSlot(I)));
}
@@ -3797,7 +3799,7 @@ class ASTIdentifierTableTrait {
InterestingIdentifierOffsets->push_back(Out.tell());
unsigned KeyLen = II->getLength() + 1;
- unsigned DataLen = 4; // 4 bytes for the persistent ID << 1
+ unsigned DataLen = sizeof(IdentifierID); // bytes for the persistent ID <<
1
if (isInterestingIdentifier(II, MacroOffset)) {
DataLen += 2; // 2 bytes for builtin ID
DataLen += 2; // 2 bytes for flags
@@ -3823,11 +3825,11 @@ class ASTIdentifierTableTrait {
auto MacroOffset = Writer.getMacroDirectivesOffset(II);
if (!isInterestingIdentifier(II, MacroOffset)) {
- LE.write<uint32_t>(ID << 1);
+ LE.write<IdentifierID>(ID << 1);
return;
}
- LE.write<uint32_t>((ID << 1) | 0x01);
+ LE.write<IdentifierID>((ID << 1) | 0x01);
uint32_t Bits = (uint32_t)II->getObjCOrBuiltinID();
assert((Bits & 0xffff) == Bits && "ObjCOrBuiltinID too big for
ASTReader.");
LE.write<uint16_t>(Bits);
@@ -3860,6 +3862,10 @@ class ASTIdentifierTableTrait {
} // namespace
+/// If the \param IdentifierID ID is a local Identifier ID. If the higher
+/// bits of ID is 0, it implies that the ID doesn't come from AST files.
+static bool isLocalIdentifierID(IdentifierID ID) { return !(ID >> 32); }
+
/// Write the identifier table into the AST file.
///
/// The identifier table consists of a blob containing string data
@@ -3904,7 +3910,7 @@ void ASTWriter::WriteIdentifierTable(Preprocessor &PP,
// Write out identifiers if either the ID is local or the identifier has
// changed since it was loaded.
- if (ID >= FirstIdentID || II->hasChangedSinceDeserialization() ||
+ if (isLocalIdentifierID(ID) || II->hasChangedSinceDeserialization() ||
(Trait.needDecls() &&
II->hasFETokenInfoChangedSinceDeserialization()))
Generator.insert(II, ID, Trait);
@@ -3938,7 +3944,6 @@ void ASTWriter::WriteIdentifierTable(Preprocessor &PP,
auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_OFFSET));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of identifiers
- Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
unsigned IdentifierOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
@@ -3948,8 +3953,7 @@ void ASTWriter::WriteIdentifierTable(Preprocessor &PP,
#endif
RecordData::value_type Record[] = {IDENTIFIER_OFFSET,
- IdentifierOffsets.size(),
- FirstIdentID - NUM_PREDEF_IDENT_IDS};
+ IdentifierOffsets.size()};
Stream.EmitRecordWithBlob(IdentifierOffsetAbbrev, Record,
bytes(IdentifierOffsets));
@@ -4043,11 +4047,13 @@ class ASTDeclContextNameLookupTrait {
unsigned KeyLen = 1;
switch (Name.getKind()) {
case DeclarationName::Identifier:
+ case DeclarationName::CXXLiteralOperatorName:
+ case DeclarationName::CXXDeductionGuideName:
+ KeyLen += sizeof(IdentifierID);
+ break;
case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
case DeclarationName::ObjCMultiArgSelector:
- case DeclarationName::CXXLiteralOperatorName:
- case DeclarationName::CXXDeductionGuideName:
KeyLen += 4;
break;
case DeclarationName::CXXOperatorName:
@@ -4075,7 +4081,7 @@ class ASTDeclContextNameLookupTrait {
case DeclarationName::Identifier:
case DeclarationName::CXXLiteralOperatorName:
case DeclarationName::CXXDeductionGuideName:
- LE.write<uint32_t>(Writer.getIdentifierRef(Name.getIdentifier()));
+ LE.write<IdentifierID>(Writer.getIdentifierRef(Name.getIdentifier()));
return;
case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
@@ -4793,8 +4799,15 @@ void ASTWriter::SetIdentifierOffset(const IdentifierInfo
*II, uint32_t Offset) {
IdentifierID ID = IdentifierIDs[II];
// Only store offsets new to this AST file. Other identifier names are looked
// up earlier in the chain and thus don't need an offset.
- if (ID >= FirstIdentID)
- IdentifierOffsets[ID - FirstIdentID] = Offset;
+ if (!isLocalIdentifierID(ID))
+ return;
+
+ // For local identifiers, the module file index must be 0.
+
+ assert(ID != 0);
+ ID -= NUM_PREDEF_IDENT_IDS;
+ assert(ID < IdentifierOffsets.size());
+ IdentifierOffsets[ID] = Offset;
}
/// Note that the selector Sel occurs at the given offset
@@ -5446,7 +5459,6 @@ ASTFileSignature ASTWriter::WriteASTCore(Sema &SemaRef,
StringRef isysroot,
// These values should be unique within a chain, since they will be
read
// as keys into ContinuousRangeMaps.
- writeBaseIDOrNone(M.BaseIdentifierID, M.LocalNumIdentifiers);
writeBaseIDOrNone(M.BaseMacroID, M.LocalNumMacros);
writeBaseIDOrNone(M.BasePreprocessedEntityID,
M.NumPreprocessedEntities);
@@ -6647,20 +6659,26 @@ void ASTWriter::ReaderInitialized(ASTReader *Reader) {
// Note, this will get called multiple times, once one the reader starts up
// and again each time it's done reading a PCH or module.
FirstTypeID = NUM_PREDEF_TYPE_IDS + Chain->getTotalNumTypes();
- FirstIdentID = NUM_PREDEF_IDENT_IDS + Chain->getTotalNumIdentifiers();
FirstMacroID = NUM_PREDEF_MACRO_IDS + Chain->getTotalNumMacros();
FirstSubmoduleID = NUM_PREDEF_SUBMODULE_IDS + Chain->getTotalNumSubmodules();
FirstSelectorID = NUM_PREDEF_SELECTOR_IDS + Chain->getTotalNumSelectors();
NextTypeID = FirstTypeID;
- NextIdentID = FirstIdentID;
NextMacroID = FirstMacroID;
NextSelectorID = FirstSelectorID;
NextSubmoduleID = FirstSubmoduleID;
}
void ASTWriter::IdentifierRead(IdentifierID ID, IdentifierInfo *II) {
- // Always keep the highest ID. See \p TypeRead() for more information.
IdentifierID &StoredID = IdentifierIDs[II];
+ unsigned OriginalModuleFileIndex = StoredID >> 32;
+
+ // Always keep the local identifier ID. See \p TypeRead() for more
+ // information.
+ if (OriginalModuleFileIndex == 0 && StoredID)
+ return;
+
+ // Otherwise, keep the highest ID since the module file comes later has
+ // higher module file indexes.
if (ID > StoredID)
StoredID = ID;
}
diff --git a/clang/lib/Serialization/GlobalModuleIndex.cpp
b/clang/lib/Serialization/GlobalModuleIndex.cpp
index f09ceb8d31620..1163943c5dffa 100644
--- a/clang/lib/Serialization/GlobalModuleIndex.cpp
+++ b/clang/lib/Serialization/GlobalModuleIndex.cpp
@@ -510,7 +510,8 @@ namespace {
// The first bit indicates whether this identifier is interesting.
// That's all we care about.
using namespace llvm::support;
- unsigned RawID = endian::readNext<uint32_t, llvm::endianness::little>(d);
+ IdentifierID RawID =
+ endian::readNext<IdentifierID, llvm::endianness::little>(d);
bool IsInteresting = RawID & 0x01;
return std::make_pair(k, IsInteresting);
}
diff --git a/clang/lib/Serialization/ModuleFile.cpp
b/clang/lib/Serialization/ModuleFile.cpp
index f64a59bd94891..7976c28b28671 100644
--- a/clang/lib/Serialization/ModuleFile.cpp
+++ b/clang/lib/Serialization/ModuleFile.cpp
@@ -62,7 +62,6 @@ LLVM_DUMP_METHOD void ModuleFile::dump() {
llvm::errs() << " Base identifier ID: " << BaseIdentifierID << '\n'
<< " Number of identifiers: " << LocalNumIdentifiers << '\n';
- dumpLocalRemap("Identifier ID local -> global map", IdentifierRemap);
llvm::errs() << " Base macro ID: " << BaseMacroID << '\n'
<< " Number of macros: " << LocalNumMacros << '\n';
diff --git a/clang/test/Modules/no-transitive-identifier-change.cppm
b/clang/test/Modules/no-transitive-identifier-change.cppm
new file mode 100644
index 0000000000000..97e8ac4444fdd
--- /dev/null
+++ b/clang/test/Modules/no-transitive-identifier-change.cppm
@@ -0,0 +1,110 @@
+// Testing that adding an new identifier in an unused module file won't change
+// the BMI of the current module file.
+//
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+//
+// RUN: %clang_cc1 -std=c++20 %t/m-partA.cppm -emit-reduced-module-interface
-o %t/m-partA.pcm
+// RUN: %clang_cc1 -std=c++20 %t/m-partA.v1.cppm
-emit-reduced-module-interface -o \
+// RUN: %t/m-partA.v1.pcm
+// RUN: %clang_cc1 -std=c++20 %t/m-partB.cppm -emit-reduced-module-interface
-o %t/m-partB.pcm
+// RUN: %clang_cc1 -std=c++20 %t/m.cppm -emit-reduced-module-interface -o
%t/m.pcm \
+// RUN: -fmodule-file=m:partA=%t/m-partA.pcm
-fmodule-file=m:partB=%t/m-partB.pcm
+// RUN: %clang_cc1 -std=c++20 %t/m.cppm -emit-reduced-module-interface -o
%t/m.v1.pcm \
+// RUN: -fmodule-file=m:partA=%t/m-partA.v1.pcm
-fmodule-file=m:partB=%t/m-partB.pcm
+//
+// RUN: %clang_cc1 -std=c++20 %t/useBOnly.cppm -emit-reduced-module-interface
-o %t/useBOnly.pcm \
+// RUN: -fmodule-file=m=%t/m.pcm -fmodule-file=m:partA=%t/m-partA.pcm \
+// RUN: -fmodule-file=m:partB=%t/m-partB.pcm
+// RUN: %clang_cc1 -std=c++20 %t/useBOnly.cppm -emit-reduced-module-interface
-o %t/useBOnly.v1.pcm \
+// RUN: -fmodule-file=m=%t/m.v1.pcm
-fmodule-file=m:partA=%t/m-partA.v1.pcm \
+// RUN: -fmodule-file=m:partB=%t/m-partB.pcm
+// Since useBOnly only uses partB from module M, the change in partA shouldn't
affect
+// useBOnly.
+// RUN: diff %t/useBOnly.pcm %t/useBOnly.v1.pcm &> /dev/null
+//
+// RUN: %clang_cc1 -std=c++20 %t/useAOnly.cppm -emit-reduced-module-interface
-o %t/useAOnly.pcm \
+// RUN: -fmodule-file=m=%t/m.pcm -fmodule-file=m:partA=%t/m-partA.pcm \
+// RUN: -fmodule-file=m:partB=%t/m-partB.pcm
+// RUN: %clang_cc1 -std=c++20 %t/useAOnly.cppm -emit-reduced-module-interface
-o %t/useAOnly.v1.pcm \
+// RUN: -fmodule-file=m=%t/m.v1.pcm
-fmodule-file=m:partA=%t/m-partA.v1.pcm \
+// RUN: -fmodule-file=m:partB=%t/m-partB.pcm
+// useAOnly should differ
+// RUN: not diff %t/useAOnly.pcm %t/useAOnly.v1.pcm &> /dev/null
+
+//--- m-partA.cppm
+export module m:partA;
+
+export inline int getA() {
+ return 43;
+}
+
+export class A {
+public:
+ int getMem();
+};
+
+export template <typename T>
+class ATempl {
+public:
+ T getT();
+};
+
+//--- m-partA.v1.cppm
+export module m:partA;
+
+export inline int getA() {
+ return 43;
+}
+
+// Now we add a new declaration without introducing a new type.
+// The consuming module which didn't use m:partA completely is expected to be
+// not changed.
+export inline int getA2() {
+ return 88;
+}
+
+export class A {
+public:
+ int getMem();
+ // Now we add a new declaration without introducing a new type.
+ // The consuming module which didn't use m:partA completely is expected to
be
+ // not changed.
+ int getMem2();
+};
+
+export template <typename T>
+class ATempl {
+public:
+ T getT();
+ // Add a new declaration without introducing a new type.
+ T getT2();
+};
+
+//--- m-partB.cppm
+export module m:partB;
+
+export inline int getB() {
+ return 430;
+}
+
+//--- m.cppm
+export module m;
+export import :partA;
+export import :partB;
+
+//--- useBOnly.cppm
+export module useBOnly;
+import m;
+
+export inline int get() {
+ return getB();
+}
+
+//--- useAOnly.cppm
+export module useAOnly;
+import m;
+
+export inline int get() {
+ return getA();
+}
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