https://github.com/ChuanqiXu9 updated
https://github.com/llvm/llvm-project/pull/86912
>From 2c20a6200fb2790b3a891ffc8c43682c113c7e8a Mon Sep 17 00:00:00 2001
From: Chuanqi Xu <yedeng...@linux.alibaba.com>
Date: Mon, 18 Mar 2024 08:36:55 +0800
Subject: [PATCH] [Modules] No transitive source location change
---
clang/include/clang/Basic/SourceLocation.h | 1 +
.../include/clang/Serialization/ASTBitCodes.h | 56 +++++-------
clang/include/clang/Serialization/ASTReader.h | 48 ++++++----
clang/include/clang/Serialization/ASTWriter.h | 4 +
.../include/clang/Serialization/ModuleFile.h | 14 ++-
.../Serialization/SourceLocationEncoding.h | 91 +++++++++++++------
clang/lib/Frontend/ASTUnit.cpp | 2 -
clang/lib/Serialization/ASTReader.cpp | 57 ++++--------
clang/lib/Serialization/ASTReaderDecl.cpp | 2 +-
clang/lib/Serialization/ASTWriter.cpp | 41 +++++++--
clang/lib/Serialization/ASTWriterDecl.cpp | 8 +-
clang/lib/Serialization/ModuleFile.cpp | 1 -
.../no-transitive-source-location-change.cppm | 69 ++++++++++++++
clang/test/Modules/pr61067.cppm | 25 -----
.../SourceLocationEncodingTest.cpp | 12 ++-
15 files changed, 269 insertions(+), 162 deletions(-)
create mode 100644 clang/test/Modules/no-transitive-source-location-change.cppm
diff --git a/clang/include/clang/Basic/SourceLocation.h
b/clang/include/clang/Basic/SourceLocation.h
index 00b1e0fa855b7a..7a0f5ba8d1270b 100644
--- a/clang/include/clang/Basic/SourceLocation.h
+++ b/clang/include/clang/Basic/SourceLocation.h
@@ -90,6 +90,7 @@ class SourceLocation {
friend class ASTWriter;
friend class SourceManager;
friend struct llvm::FoldingSetTrait<SourceLocation, void>;
+ friend class SourceLocationEncoding;
public:
using UIntTy = uint32_t;
diff --git a/clang/include/clang/Serialization/ASTBitCodes.h
b/clang/include/clang/Serialization/ASTBitCodes.h
index 186c3b722ced16..94a3d24d47926b 100644
--- a/clang/include/clang/Serialization/ASTBitCodes.h
+++ b/clang/include/clang/Serialization/ASTBitCodes.h
@@ -23,6 +23,7 @@
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/OperatorKinds.h"
#include "clang/Basic/SourceLocation.h"
+#include "clang/Serialization/SourceLocationEncoding.h"
#include "llvm/ADT/DenseMapInfo.h"
#include "llvm/Bitstream/BitCodes.h"
#include <cassert>
@@ -167,45 +168,38 @@ const unsigned int NUM_PREDEF_SUBMODULE_IDS = 1;
/// Source range/offset of a preprocessed entity.
struct PPEntityOffset {
+ using RawLocEncoding = SourceLocationEncoding::RawLocEncoding;
+
/// Raw source location of beginning of range.
- SourceLocation::UIntTy Begin;
+ RawLocEncoding Begin;
/// Raw source location of end of range.
- SourceLocation::UIntTy End;
+ RawLocEncoding End;
/// Offset in the AST file relative to ModuleFile::MacroOffsetsBase.
uint32_t BitOffset;
- PPEntityOffset(SourceRange R, uint32_t BitOffset)
- : Begin(R.getBegin().getRawEncoding()), End(R.getEnd().getRawEncoding()),
- BitOffset(BitOffset) {}
-
- SourceLocation getBegin() const {
- return SourceLocation::getFromRawEncoding(Begin);
- }
+ PPEntityOffset(RawLocEncoding Begin, RawLocEncoding End, uint32_t BitOffset)
+ : Begin(Begin), End(End), BitOffset(BitOffset) {}
- SourceLocation getEnd() const {
- return SourceLocation::getFromRawEncoding(End);
- }
+ RawLocEncoding getBegin() const { return Begin; }
+ RawLocEncoding getEnd() const { return End; }
};
/// Source range of a skipped preprocessor region
struct PPSkippedRange {
+ using RawLocEncoding = SourceLocationEncoding::RawLocEncoding;
+
/// Raw source location of beginning of range.
- SourceLocation::UIntTy Begin;
+ RawLocEncoding Begin;
/// Raw source location of end of range.
- SourceLocation::UIntTy End;
+ RawLocEncoding End;
- PPSkippedRange(SourceRange R)
- : Begin(R.getBegin().getRawEncoding()), End(R.getEnd().getRawEncoding())
{
- }
+ PPSkippedRange(RawLocEncoding Begin, RawLocEncoding End)
+ : Begin(Begin), End(End) {}
- SourceLocation getBegin() const {
- return SourceLocation::getFromRawEncoding(Begin);
- }
- SourceLocation getEnd() const {
- return SourceLocation::getFromRawEncoding(End);
- }
+ RawLocEncoding getBegin() const { return Begin; }
+ RawLocEncoding getEnd() const { return End; }
};
/// Offset in the AST file. Use splitted 64-bit integer into low/high
@@ -231,8 +225,10 @@ struct UnderalignedInt64 {
/// Source location and bit offset of a declaration.
struct DeclOffset {
+ using RawLocEncoding = SourceLocationEncoding::RawLocEncoding;
+
/// Raw source location.
- SourceLocation::UIntTy Loc = 0;
+ RawLocEncoding RawLoc = 0;
/// Offset relative to the start of the DECLTYPES_BLOCK block. Keep
/// structure alignment 32-bit and avoid padding gap because undefined
@@ -240,17 +236,15 @@ struct DeclOffset {
UnderalignedInt64 BitOffset;
DeclOffset() = default;
- DeclOffset(SourceLocation Loc, uint64_t BitOffset,
- uint64_t DeclTypesBlockStartOffset) {
- setLocation(Loc);
+ DeclOffset(RawLocEncoding RawLoc, uint64_t BitOffset,
+ uint64_t DeclTypesBlockStartOffset)
+ : RawLoc(RawLoc) {
setBitOffset(BitOffset, DeclTypesBlockStartOffset);
}
- void setLocation(SourceLocation L) { Loc = L.getRawEncoding(); }
+ void setRawLoc(RawLocEncoding Loc) { RawLoc = Loc; }
- SourceLocation getLocation() const {
- return SourceLocation::getFromRawEncoding(Loc);
- }
+ RawLocEncoding getRawLoc() const { return RawLoc; }
void setBitOffset(uint64_t Offset, const uint64_t DeclTypesBlockStartOffset)
{
BitOffset.setBitOffset(Offset - DeclTypesBlockStartOffset);
diff --git a/clang/include/clang/Serialization/ASTReader.h
b/clang/include/clang/Serialization/ASTReader.h
index 64f1ebc117b327..e24fa121528f3f 100644
--- a/clang/include/clang/Serialization/ASTReader.h
+++ b/clang/include/clang/Serialization/ASTReader.h
@@ -1771,6 +1771,7 @@ class ASTReader
/// Retrieve the module manager.
ModuleManager &getModuleManager() { return ModuleMgr; }
+ const ModuleManager &getModuleManager() const { return ModuleMgr; }
/// Retrieve the preprocessor.
Preprocessor &getPreprocessor() const { return PP; }
@@ -2177,8 +2178,8 @@ class ASTReader
/// Retrieve the global submodule ID given a module and its local ID
/// number.
- serialization::SubmoduleID
- getGlobalSubmoduleID(ModuleFile &M, unsigned LocalID);
+ serialization::SubmoduleID getGlobalSubmoduleID(ModuleFile &M,
+ unsigned LocalID) const;
/// Retrieve the submodule that corresponds to a global submodule ID.
///
@@ -2191,7 +2192,7 @@ class ASTReader
/// Retrieve the module file with a given local ID within the specified
/// ModuleFile.
- ModuleFile *getLocalModuleFile(ModuleFile &M, unsigned ID);
+ ModuleFile *getLocalModuleFile(ModuleFile &M, unsigned ID) const;
/// Get an ID for the given module file.
unsigned getModuleFileID(ModuleFile *M);
@@ -2227,33 +2228,46 @@ class ASTReader
return Sema::AlignPackInfo::getFromRawEncoding(Raw);
}
+ using RawLocEncoding = SourceLocationEncoding::RawLocEncoding;
+
/// Read a source location from raw form and return it in its
/// originating module file's source location space.
- SourceLocation ReadUntranslatedSourceLocation(SourceLocation::UIntTy Raw,
- LocSeq *Seq = nullptr) const {
+ std::pair<SourceLocation, unsigned>
+ ReadUntranslatedSourceLocation(RawLocEncoding Raw,
+ LocSeq *Seq = nullptr) const {
return SourceLocationEncoding::decode(Raw, Seq);
}
/// Read a source location from raw form.
- SourceLocation ReadSourceLocation(ModuleFile &ModuleFile,
- SourceLocation::UIntTy Raw,
+ SourceLocation ReadSourceLocation(ModuleFile &MF, RawLocEncoding Raw,
LocSeq *Seq = nullptr) const {
- SourceLocation Loc = ReadUntranslatedSourceLocation(Raw, Seq);
- return TranslateSourceLocation(ModuleFile, Loc);
+ if (!MF.ModuleOffsetMap.empty())
+ ReadModuleOffsetMap(MF);
+
+ auto [Loc, ModuleFileIndex] = ReadUntranslatedSourceLocation(Raw, Seq);
+ ModuleFile *OwningModuleFile =
+ ModuleFileIndex == 0 ? &MF : MF.DependentModules[ModuleFileIndex - 1];
+
+ assert(!SourceMgr.isLoadedSourceLocation(Loc) &&
+ "Run out source location space");
+
+ return TranslateSourceLocation(*OwningModuleFile, Loc);
}
/// Translate a source location from another module file's source
/// location space into ours.
SourceLocation TranslateSourceLocation(ModuleFile &ModuleFile,
SourceLocation Loc) const {
- if (!ModuleFile.ModuleOffsetMap.empty())
- ReadModuleOffsetMap(ModuleFile);
- assert(ModuleFile.SLocRemap.find(Loc.getOffset()) !=
- ModuleFile.SLocRemap.end() &&
- "Cannot find offset to remap.");
- SourceLocation::IntTy Remap =
- ModuleFile.SLocRemap.find(Loc.getOffset())->second;
- return Loc.getLocWithOffset(Remap);
+ if (Loc.isInvalid())
+ return Loc;
+
+ // FIXME: TranslateSourceLocation is not re-enterable. It is problematic
+ // to call TranslateSourceLocation on a translated source location.
+ // We either need a method to know whether or not a source location is
+ // translated or refactor the code to make it clear that
+ // TranslateSourceLocation won't be called with translated source location.
+
+ return Loc.getLocWithOffset(ModuleFile.SLocEntryBaseOffset - 2);
}
/// Read a source location.
diff --git a/clang/include/clang/Serialization/ASTWriter.h
b/clang/include/clang/Serialization/ASTWriter.h
index 6c45b7348b8552..428bf6a5a791b3 100644
--- a/clang/include/clang/Serialization/ASTWriter.h
+++ b/clang/include/clang/Serialization/ASTWriter.h
@@ -666,6 +666,10 @@ class ASTWriter : public ASTDeserializationListener,
void AddSourceLocation(SourceLocation Loc, RecordDataImpl &Record,
LocSeq *Seq = nullptr);
+ /// Return the raw encodings for source locations.
+ SourceLocationEncoding::RawLocEncoding
+ getRawSourceLocationEncoding(SourceLocation Loc, LocSeq *Seq = nullptr);
+
/// Emit a source range.
void AddSourceRange(SourceRange Range, RecordDataImpl &Record,
LocSeq *Seq = nullptr);
diff --git a/clang/include/clang/Serialization/ModuleFile.h
b/clang/include/clang/Serialization/ModuleFile.h
index 25f644e76edb1a..ba8df0ed259427 100644
--- a/clang/include/clang/Serialization/ModuleFile.h
+++ b/clang/include/clang/Serialization/ModuleFile.h
@@ -295,10 +295,6 @@ class ModuleFile {
/// AST file.
const uint32_t *SLocEntryOffsets = nullptr;
- /// Remapping table for source locations in this module.
- ContinuousRangeMap<SourceLocation::UIntTy, SourceLocation::IntTy, 2>
- SLocRemap;
-
// === Identifiers ===
/// The number of identifiers in this AST file.
@@ -512,9 +508,17 @@ class ModuleFile {
/// List of modules which depend on this module
llvm::SetVector<ModuleFile *> ImportedBy;
- /// List of modules which this module depends on
+ /// List of modules which this module directly imported
llvm::SetVector<ModuleFile *> Imports;
+ /// List of modules which this modules dependent on. Different
+ /// from `Imports`, this includes indirectly imported modules too.
+ /// The order of DependentModules is significant. It should keep
+ /// the same order with that module file manager when we write
+ /// the current module file. The value of the member will be initialized
+ /// in `ASTReader::ReadModuleOffsetMap`.
+ llvm::SmallVector<ModuleFile *, 16> DependentModules;
+
/// Determine whether this module was directly imported at
/// any point during translation.
bool isDirectlyImported() const { return DirectlyImported; }
diff --git a/clang/include/clang/Serialization/SourceLocationEncoding.h
b/clang/include/clang/Serialization/SourceLocationEncoding.h
index 9bb0dbe2e4d6f6..33ca1728fa4797 100644
--- a/clang/include/clang/Serialization/SourceLocationEncoding.h
+++ b/clang/include/clang/Serialization/SourceLocationEncoding.h
@@ -6,28 +6,33 @@
//
//===----------------------------------------------------------------------===//
//
-// Source locations are stored pervasively in the AST, making up a third of
-// the size of typical serialized files. Storing them efficiently is important.
+// We wish to encode the SourceLocation from other module file not dependent
+// on the other module file. So that the source location changes from other
+// module file may not affect the contents of the current module file. Then the
+// users don't need to recompile the whole project due to a new line in a
module
+// unit in the root of the dependency graph.
//
-// We use integers optimized by VBR-encoding, because:
-// - when abbreviations cannot be used, VBR6 encoding is our only choice
-// - in the worst case a SourceLocation can be ~any 32-bit number, but in
-// practice they are highly predictable
+// To achieve this, we need to encode the index of the module file into the
+// encoding of the source location. The encoding of the source location may be:
//
-// We encode the integer so that likely values encode as small numbers that
-// turn into few VBR chunks:
-// - the invalid sentinel location is a very common value: it encodes as 0
-// - the "macro or not" bit is stored at the bottom of the integer
-// (rather than at the top, as in memory), so macro locations can have
-// small representations.
-// - related locations (e.g. of a left and right paren pair) are usually
-// similar, so when encoding a sequence of locations we store only
-// differences between successive elements.
+// |-----------------------|-----------------------|
+// | A | B | C |
+//
+// * A: 32 bit. The index of the module file in the module manager + 1. The +1
+// here is necessary since we wish 0 stands for the current module file.
+// * B: 31 bit. The offset of the source location to the module file
containing
+// it.
+// * C: The macro bit. We rotate it to the lowest bit so that we can save some
+// space in case the index of the module file is 0.
+//
+// Specially, if the index of the module file is 0, we allow to encode a
+// sequence of locations we store only differences between successive elements.
//
//===----------------------------------------------------------------------===//
-#include <climits>
#include "clang/Basic/SourceLocation.h"
+#include "llvm/Support/MathExtras.h"
+#include <climits>
#ifndef LLVM_CLANG_SERIALIZATION_SOURCELOCATIONENCODING_H
#define LLVM_CLANG_SERIALIZATION_SOURCELOCATIONENCODING_H
@@ -52,9 +57,13 @@ class SourceLocationEncoding {
friend SourceLocationSequence;
public:
- static uint64_t encode(SourceLocation Loc,
- SourceLocationSequence * = nullptr);
- static SourceLocation decode(uint64_t, SourceLocationSequence * = nullptr);
+ using RawLocEncoding = uint64_t;
+
+ static RawLocEncoding encode(SourceLocation Loc, UIntTy BaseOffset,
+ unsigned BaseModuleFileIndex,
+ SourceLocationSequence * = nullptr);
+ static std::pair<SourceLocation, unsigned>
+ decode(RawLocEncoding, SourceLocationSequence * = nullptr);
};
/// Serialized encoding of a sequence of SourceLocations.
@@ -149,14 +158,44 @@ class SourceLocationSequence::State {
operator SourceLocationSequence *() { return &Seq; }
};
-inline uint64_t SourceLocationEncoding::encode(SourceLocation Loc,
- SourceLocationSequence *Seq) {
- return Seq ? Seq->encode(Loc) : encodeRaw(Loc.getRawEncoding());
+inline SourceLocationEncoding::RawLocEncoding
+SourceLocationEncoding::encode(SourceLocation Loc, UIntTy BaseOffset,
+ unsigned BaseModuleFileIndex,
+ SourceLocationSequence *Seq) {
+ // If the source location is a local source location, we can try to optimize
+ // the similar sequences to only record the differences.
+ if (!BaseOffset)
+ return Seq ? Seq->encode(Loc) : encodeRaw(Loc.getRawEncoding());
+
+ if (Loc.isInvalid())
+ return 0;
+
+ // Otherwise, the higher bits are used to store the module file index,
+ // so it is meaningless to optimize the source locations into small
+ // integers. Let's try to always use the raw encodings.
+ assert(Loc.getOffset() >= BaseOffset);
+ Loc = Loc.getLocWithOffset(-BaseOffset);
+ RawLocEncoding Encoded = encodeRaw(Loc.getRawEncoding());
+
+ // 16 bits should be sufficient to store the module file index.
+ assert(BaseModuleFileIndex < (1 << 16));
+ Encoded |= (RawLocEncoding)BaseModuleFileIndex << 32;
+ return Encoded;
}
-inline SourceLocation
-SourceLocationEncoding::decode(uint64_t Encoded, SourceLocationSequence *Seq) {
- return Seq ? Seq->decode(Encoded)
- : SourceLocation::getFromRawEncoding(decodeRaw(Encoded));
+inline std::pair<SourceLocation, unsigned>
+SourceLocationEncoding::decode(RawLocEncoding Encoded,
+ SourceLocationSequence *Seq) {
+ unsigned ModuleFileIndex = Encoded >> 32;
+
+ if (!ModuleFileIndex)
+ return {Seq ? Seq->decode(Encoded)
+ : SourceLocation::getFromRawEncoding(decodeRaw(Encoded)),
+ ModuleFileIndex};
+
+ Encoded &= llvm::maskTrailingOnes<RawLocEncoding>(32);
+ SourceLocation Loc = SourceLocation::getFromRawEncoding(decodeRaw(Encoded));
+
+ return {Loc, ModuleFileIndex};
}
} // namespace clang
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 1b93588553a276..755aaddc0ad747 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -2374,8 +2374,6 @@ bool ASTUnit::serialize(raw_ostream &OS) {
return serializeUnit(Writer, Buffer, getSema(), OS);
}
-using SLocRemap = ContinuousRangeMap<unsigned, int, 2>;
-
void ASTUnit::TranslateStoredDiagnostics(
FileManager &FileMgr,
SourceManager &SrcMgr,
diff --git a/clang/lib/Serialization/ASTReader.cpp
b/clang/lib/Serialization/ASTReader.cpp
index c99d6ed1c36c88..a581a8fe27a673 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -3030,8 +3030,10 @@ ASTReader::ReadControlBlock(ModuleFile &F,
// The import location will be the local one for now; we will adjust
// all import locations of module imports after the global source
// location info are setup, in ReadAST.
- SourceLocation ImportLoc =
+ auto [ImportLoc, ImportModuleFileIndex] =
ReadUntranslatedSourceLocation(Record[Idx++]);
+ // The import location must belong to the current module file itself.
+ assert(ImportModuleFileIndex == 0);
off_t StoredSize = !IsImportingStdCXXModule ? (off_t)Record[Idx++] : 0;
time_t StoredModTime =
!IsImportingStdCXXModule ? (time_t)Record[Idx++] : 0;
@@ -3653,13 +3655,6 @@ llvm::Error ASTReader::ReadASTBlock(ModuleFile &F,
std::make_pair(SourceManager::MaxLoadedOffset - F.SLocEntryBaseOffset
- SLocSpaceSize,&F));
- // Initialize the remapping table.
- // Invalid stays invalid.
- F.SLocRemap.insertOrReplace(std::make_pair(0U, 0));
- // This module. Base was 2 when being compiled.
- F.SLocRemap.insertOrReplace(std::make_pair(
- 2U, static_cast<SourceLocation::IntTy>(F.SLocEntryBaseOffset - 2)));
-
TotalNumSLocEntries += F.LocalNumSLocEntries;
break;
}
@@ -4047,18 +4042,7 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F) const
{
const unsigned char *DataEnd = Data + F.ModuleOffsetMap.size();
F.ModuleOffsetMap = StringRef();
- // If we see this entry before SOURCE_LOCATION_OFFSETS, add placeholders.
- if (F.SLocRemap.find(0) == F.SLocRemap.end()) {
- F.SLocRemap.insert(std::make_pair(0U, 0));
- F.SLocRemap.insert(std::make_pair(2U, 1));
- }
-
- // Continuous range maps we may be updating in our module.
- using SLocRemapBuilder =
- ContinuousRangeMap<SourceLocation::UIntTy, SourceLocation::IntTy,
- 2>::Builder;
using RemapBuilder = ContinuousRangeMap<uint32_t, int, 2>::Builder;
- SLocRemapBuilder SLocRemap(F.SLocRemap);
RemapBuilder IdentifierRemap(F.IdentifierRemap);
RemapBuilder MacroRemap(F.MacroRemap);
RemapBuilder PreprocessedEntityRemap(F.PreprocessedEntityRemap);
@@ -4067,6 +4051,9 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F) const {
RemapBuilder DeclRemap(F.DeclRemap);
RemapBuilder TypeRemap(F.TypeRemap);
+ auto &ImportedModuleVector = F.DependentModules;
+ assert(ImportedModuleVector.empty());
+
while (Data < DataEnd) {
// FIXME: Looking up dependency modules by filename is horrible. Let's
// start fixing this with prebuilt, explicit and implicit modules and see
@@ -4082,15 +4069,14 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F)
const {
? ModuleMgr.lookupByModuleName(Name)
: ModuleMgr.lookupByFileName(Name));
if (!OM) {
- std::string Msg =
- "SourceLocation remap refers to unknown module, cannot find ";
+ std::string Msg = "refers to unknown module, cannot find ";
Msg.append(std::string(Name));
Error(Msg);
return;
}
- SourceLocation::UIntTy SLocOffset =
- endian::readNext<uint32_t, llvm::endianness::little>(Data);
+ ImportedModuleVector.push_back(OM);
+
uint32_t IdentifierIDOffset =
endian::readNext<uint32_t, llvm::endianness::little>(Data);
uint32_t MacroIDOffset =
@@ -4114,13 +4100,6 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F) const
{
static_cast<int>(BaseOffset - Offset)));
};
- constexpr SourceLocation::UIntTy SLocNone =
- std::numeric_limits<SourceLocation::UIntTy>::max();
- if (SLocOffset != SLocNone)
- SLocRemap.insert(std::make_pair(
- SLocOffset, static_cast<SourceLocation::IntTy>(
- OM->SLocEntryBaseOffset - SLocOffset)));
-
mapOffset(IdentifierIDOffset, OM->BaseIdentifierID, IdentifierRemap);
mapOffset(MacroIDOffset, OM->BaseMacroID, MacroRemap);
mapOffset(PreprocessedEntityIDOffset, OM->BasePreprocessedEntityID,
@@ -6256,8 +6235,8 @@ SourceRange ASTReader::ReadSkippedRange(unsigned
GlobalIndex) {
unsigned LocalIndex = GlobalIndex - M->BasePreprocessedSkippedRangeID;
assert(LocalIndex < M->NumPreprocessedSkippedRanges);
PPSkippedRange RawRange = M->PreprocessedSkippedRangeOffsets[LocalIndex];
- SourceRange Range(TranslateSourceLocation(*M, RawRange.getBegin()),
- TranslateSourceLocation(*M, RawRange.getEnd()));
+ SourceRange Range(ReadSourceLocation(*M, RawRange.getBegin()),
+ ReadSourceLocation(*M, RawRange.getEnd()));
assert(Range.isValid());
return Range;
}
@@ -6293,8 +6272,8 @@ PreprocessedEntity
*ASTReader::ReadPreprocessedEntity(unsigned Index) {
return nullptr;
// Read the record.
- SourceRange Range(TranslateSourceLocation(M, PPOffs.getBegin()),
- TranslateSourceLocation(M, PPOffs.getEnd()));
+ SourceRange Range(ReadSourceLocation(M, PPOffs.getBegin()),
+ ReadSourceLocation(M, PPOffs.getEnd()));
PreprocessingRecord &PPRec = *PP.getPreprocessingRecord();
StringRef Blob;
RecordData Record;
@@ -6406,7 +6385,7 @@ struct PPEntityComp {
}
SourceLocation getLoc(const PPEntityOffset &PPE) const {
- return Reader.TranslateSourceLocation(M, PPE.getBegin());
+ return Reader.ReadSourceLocation(M, PPE.getBegin());
}
};
@@ -6450,7 +6429,7 @@ PreprocessedEntityID
ASTReader::findPreprocessedEntity(SourceLocation Loc,
PPI = First;
std::advance(PPI, Half);
if (SourceMgr.isBeforeInTranslationUnit(
- TranslateSourceLocation(M, PPI->getEnd()), Loc)) {
+ ReadSourceLocation(M, PPI->getEnd()), Loc)) {
First = PPI;
++First;
Count = Count - Half - 1;
@@ -6491,7 +6470,7 @@ std::optional<bool>
ASTReader::isPreprocessedEntityInFileID(unsigned Index,
unsigned LocalIndex = PPInfo.second;
const PPEntityOffset &PPOffs = M.PreprocessedEntityOffsets[LocalIndex];
- SourceLocation Loc = TranslateSourceLocation(M, PPOffs.getBegin());
+ SourceLocation Loc = ReadSourceLocation(M, PPOffs.getBegin());
if (Loc.isInvalid())
return false;
@@ -8964,7 +8943,7 @@ MacroID ASTReader::getGlobalMacroID(ModuleFile &M,
unsigned LocalID) {
}
serialization::SubmoduleID
-ASTReader::getGlobalSubmoduleID(ModuleFile &M, unsigned LocalID) {
+ASTReader::getGlobalSubmoduleID(ModuleFile &M, unsigned LocalID) const {
if (LocalID < NUM_PREDEF_SUBMODULE_IDS)
return LocalID;
@@ -8997,7 +8976,7 @@ Module *ASTReader::getModule(unsigned ID) {
return getSubmodule(ID);
}
-ModuleFile *ASTReader::getLocalModuleFile(ModuleFile &M, unsigned ID) {
+ModuleFile *ASTReader::getLocalModuleFile(ModuleFile &M, unsigned ID) const {
if (ID & 1) {
// It's a module, look it up by submodule ID.
auto I = GlobalSubmoduleMap.find(getGlobalSubmoduleID(M, ID >> 1));
diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp
b/clang/lib/Serialization/ASTReaderDecl.cpp
index 744f11de88c2f8..40b543f2b72462 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -3249,7 +3249,7 @@ ASTReader::RecordLocation
ASTReader::DeclCursorForID(GlobalDeclID ID,
ModuleFile *M = I->second;
const DeclOffset &DOffs =
M->DeclOffsets[ID.get() - M->BaseDeclID - NUM_PREDEF_DECL_IDS];
- Loc = TranslateSourceLocation(*M, DOffs.getLocation());
+ Loc = ReadSourceLocation(*M, DOffs.getRawLoc());
return RecordLocation(M, DOffs.getBitOffset(M->DeclsBlockStartOffset));
}
diff --git a/clang/lib/Serialization/ASTWriter.cpp
b/clang/lib/Serialization/ASTWriter.cpp
index 0408eeb6a95b00..34f0aa46cf6adb 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -2677,8 +2677,10 @@ void
ASTWriter::WritePreprocessorDetail(PreprocessingRecord &PPRec,
uint64_t Offset = Stream.GetCurrentBitNo() - MacroOffsetsBase;
assert((Offset >> 32) == 0 && "Preprocessed entity offset too large");
- PreprocessedEntityOffsets.push_back(
- PPEntityOffset(getAdjustedRange((*E)->getSourceRange()), Offset));
+ SourceRange R = getAdjustedRange((*E)->getSourceRange());
+ PreprocessedEntityOffsets.emplace_back(
+ getRawSourceLocationEncoding(R.getBegin()),
+ getRawSourceLocationEncoding(R.getEnd()), Offset);
if (auto *MD = dyn_cast<MacroDefinitionRecord>(*E)) {
// Record this macro definition's ID.
@@ -2745,7 +2747,9 @@ void
ASTWriter::WritePreprocessorDetail(PreprocessingRecord &PPRec,
std::vector<PPSkippedRange> SerializedSkippedRanges;
SerializedSkippedRanges.reserve(SkippedRanges.size());
for (auto const& Range : SkippedRanges)
- SerializedSkippedRanges.emplace_back(Range);
+ SerializedSkippedRanges.emplace_back(
+ getRawSourceLocationEncoding(Range.getBegin()),
+ getRawSourceLocationEncoding(Range.getEnd()));
using namespace llvm;
auto Abbrev = std::make_shared<BitCodeAbbrev>();
@@ -2911,8 +2915,8 @@ void ASTWriter::WriteSubmodules(Module *WritingModule) {
ParentID = SubmoduleIDs[Mod->Parent];
}
- uint64_t DefinitionLoc =
-
SourceLocationEncoding::encode(getAdjustedLocation(Mod->DefinitionLoc));
+ SourceLocationEncoding::RawLocEncoding DefinitionLoc =
+ getRawSourceLocationEncoding(getAdjustedLocation(Mod->DefinitionLoc));
// Emit the definition of the block.
{
@@ -5296,7 +5300,6 @@ 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.SLocEntryBaseOffset, M.LocalNumSLocEntries);
writeBaseIDOrNone(M.BaseIdentifierID, M.LocalNumIdentifiers);
writeBaseIDOrNone(M.BaseMacroID, M.LocalNumMacros);
writeBaseIDOrNone(M.BasePreprocessedEntityID,
@@ -5789,10 +5792,34 @@ void ASTWriter::AddFileID(FileID FID, RecordDataImpl
&Record) {
Record.push_back(getAdjustedFileID(FID).getOpaqueValue());
}
+SourceLocationEncoding::RawLocEncoding
+ASTWriter::getRawSourceLocationEncoding(SourceLocation Loc, LocSeq *Seq) {
+ unsigned BaseOffset = 0;
+ unsigned ModuleFileIndex = 0;
+
+ // See SourceLocationEncoding.h for the encoding details.
+ if (Context->getSourceManager().isLoadedSourceLocation(Loc) &&
+ Loc.isValid()) {
+ assert(getChain());
+ auto SLocMapI = getChain()->GlobalSLocOffsetMap.find(
+ SourceManager::MaxLoadedOffset - Loc.getOffset() - 1);
+ assert(SLocMapI != getChain()->GlobalSLocOffsetMap.end() &&
+ "Corrupted global sloc offset map");
+ ModuleFile *F = SLocMapI->second;
+ BaseOffset = F->SLocEntryBaseOffset - 2;
+ // 0 means the location is not loaded. So we need to add 1 to the index to
+ // make it clear.
+ ModuleFileIndex = F->Index + 1;
+ assert(&getChain()->getModuleManager()[F->Index] == F);
+ }
+
+ return SourceLocationEncoding::encode(Loc, BaseOffset, ModuleFileIndex, Seq);
+}
+
void ASTWriter::AddSourceLocation(SourceLocation Loc, RecordDataImpl &Record,
SourceLocationSequence *Seq) {
Loc = getAdjustedLocation(Loc);
- Record.push_back(SourceLocationEncoding::encode(Loc, Seq));
+ Record.push_back(getRawSourceLocationEncoding(Loc, Seq));
}
void ASTWriter::AddSourceRange(SourceRange Range, RecordDataImpl &Record,
diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp
b/clang/lib/Serialization/ASTWriterDecl.cpp
index 0edc4feda3ef23..6201d284f0e025 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -2809,14 +2809,16 @@ void ASTWriter::WriteDecl(ASTContext &Context, Decl *D)
{
// Record the offset for this declaration
SourceLocation Loc = D->getLocation();
+ SourceLocationEncoding::RawLocEncoding RawLoc =
+ getRawSourceLocationEncoding(getAdjustedLocation(Loc));
+
unsigned Index = ID.get() - FirstDeclID.get();
if (DeclOffsets.size() == Index)
- DeclOffsets.emplace_back(getAdjustedLocation(Loc), Offset,
- DeclTypesBlockStartOffset);
+ DeclOffsets.emplace_back(RawLoc, Offset, DeclTypesBlockStartOffset);
else if (DeclOffsets.size() < Index) {
// FIXME: Can/should this happen?
DeclOffsets.resize(Index+1);
- DeclOffsets[Index].setLocation(getAdjustedLocation(Loc));
+ DeclOffsets[Index].setRawLoc(RawLoc);
DeclOffsets[Index].setBitOffset(Offset, DeclTypesBlockStartOffset);
} else {
llvm_unreachable("declarations should be emitted in ID order");
diff --git a/clang/lib/Serialization/ModuleFile.cpp
b/clang/lib/Serialization/ModuleFile.cpp
index db896fd361159d..2c42d33a8f5dd3 100644
--- a/clang/lib/Serialization/ModuleFile.cpp
+++ b/clang/lib/Serialization/ModuleFile.cpp
@@ -59,7 +59,6 @@ LLVM_DUMP_METHOD void ModuleFile::dump() {
// Remapping tables.
llvm::errs() << " Base source location offset: " << SLocEntryBaseOffset
<< '\n';
- dumpLocalRemap("Source location offset local -> global map", SLocRemap);
llvm::errs() << " Base identifier ID: " << BaseIdentifierID << '\n'
<< " Number of identifiers: " << LocalNumIdentifiers << '\n';
diff --git a/clang/test/Modules/no-transitive-source-location-change.cppm
b/clang/test/Modules/no-transitive-source-location-change.cppm
new file mode 100644
index 00000000000000..b876fbb6d9f0cf
--- /dev/null
+++ b/clang/test/Modules/no-transitive-source-location-change.cppm
@@ -0,0 +1,69 @@
+// Testing that adding a new line in a module interface unit won't cause the
BMI
+// of consuming module unit changes.
+//
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+// RUN: cd %t
+//
+// RUN: %clang_cc1 -std=c++20 %t/A.cppm -emit-module-interface -o %t/A.pcm
+
+//
+// RUN: %clang_cc1 -std=c++20 %t/A.v1.cppm -emit-module-interface -o
%t/A.v1.pcm
+//
+// The BMI may not be the same since the source location differs.
+// RUN: not diff %t/A.pcm %t/A.v1.pcm &> /dev/null
+//
+// The BMI of B shouldn't change since all the locations remain the same.
+// RUN: %clang_cc1 -std=c++20 %t/B.cppm -emit-module-interface
-fmodule-file=A=%t/A.pcm \
+// RUN: -o %t/B.pcm
+// RUN: %clang_cc1 -std=c++20 %t/B.cppm -emit-module-interface
-fmodule-file=A=%t/A.v1.pcm \
+// RUN: -o %t/B.v1.pcm
+// RUN: diff %t/B.v1.pcm %t/B.pcm &> /dev/null
+//
+// The BMI of C may change since the locations for instantiations changes.
+// RUN: %clang_cc1 -std=c++20 %t/C.cppm -emit-module-interface
-fmodule-file=A=%t/A.pcm \
+// RUN: -o %t/C.pcm
+// RUN: %clang_cc1 -std=c++20 %t/C.cppm -emit-module-interface
-fmodule-file=A=%t/A.v1.pcm \
+// RUN: -o %t/C.v1.pcm
+// RUN: not diff %t/C.v1.pcm %t/C.pcm &> /dev/null
+
+//--- A.cppm
+export module A;
+export template <class T>
+struct C {
+ T func() {
+ return T(43);
+ }
+};
+export int funcA() {
+ return 43;
+}
+
+//--- A.v1.cppm
+export module A;
+
+export template <class T>
+struct C {
+ T func() {
+ return T(43);
+ }
+};
+export int funcA() {
+ return 43;
+}
+
+//--- B.cppm
+export module B;
+import A;
+
+export int funcB() {
+ return funcA();
+}
+
+//--- C.cppm
+export module C;
+import A;
+export void testD() {
+ C<int> c;
+ c.func();
+}
diff --git a/clang/test/Modules/pr61067.cppm b/clang/test/Modules/pr61067.cppm
index b7f9d22e253854..f853491fe76bf7 100644
--- a/clang/test/Modules/pr61067.cppm
+++ b/clang/test/Modules/pr61067.cppm
@@ -9,22 +9,6 @@
// RUN: -emit-module-interface -fmodule-file=a=%t/a.pcm -o %t/b.pcm
// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/b.pcm -S \
// RUN: -emit-llvm -fmodule-file=a=%t/a.pcm -disable-llvm-passes -o - |
FileCheck %t/b.cppm
-// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/c.cpp
-fmodule-file=a=%t/a.pcm \
-// RUN: -S -emit-llvm -disable-llvm-passes -o - | FileCheck %t/c.cpp
-
-// Test again with reduced BMI
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
-// RUN: split-file %s %t
-//
-// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/a.cppm \
-// RUN: -emit-reduced-module-interface -o %t/a.pcm
-// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/b.cppm \
-// RUN: -emit-module-interface -fmodule-file=a=%t/a.pcm -o %t/b.pcm
-// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/b.pcm -S \
-// RUN: -emit-llvm -fmodule-file=a=%t/a.pcm -disable-llvm-passes -o - |
FileCheck %t/b.cppm
-// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/c.cpp
-fmodule-file=a=%t/a.pcm \
-// RUN: -S -emit-llvm -disable-llvm-passes -o - | FileCheck %t/c.cpp
//--- a.cppm
export module a;
@@ -43,12 +27,3 @@ void b() {
}
// CHECK: define{{.*}}linkonce_odr{{.*}}@_ZW1aeqS_1aS0_(
-
-//--- c.cpp
-import a;
-
-int c() {
- (void)(a() == a());
-}
-
-// CHECK: define{{.*}}linkonce_odr{{.*}}@_ZW1aeqS_1aS0_(
diff --git a/clang/unittests/Serialization/SourceLocationEncodingTest.cpp
b/clang/unittests/Serialization/SourceLocationEncodingTest.cpp
index 141da4c27f8d0b..c80a8fd0e52b17 100644
--- a/clang/unittests/Serialization/SourceLocationEncodingTest.cpp
+++ b/clang/unittests/Serialization/SourceLocationEncodingTest.cpp
@@ -23,13 +23,14 @@ using LocSeq = SourceLocationSequence;
// Loc is the raw (in-memory) form of SourceLocation.
void roundTrip(SourceLocation::UIntTy Loc,
std::optional<uint64_t> ExpectedEncoded = std::nullopt) {
- uint64_t ActualEncoded =
- SourceLocationEncoding::encode(SourceLocation::getFromRawEncoding(Loc));
+ uint64_t ActualEncoded = SourceLocationEncoding::encode(
+ SourceLocation::getFromRawEncoding(Loc), /*BaseOffset=*/0,
+ /*BaseModuleFileIndex=*/0);
if (ExpectedEncoded) {
ASSERT_EQ(ActualEncoded, *ExpectedEncoded) << "Encoding " << Loc;
}
SourceLocation::UIntTy DecodedEncoded =
- SourceLocationEncoding::decode(ActualEncoded).getRawEncoding();
+ SourceLocationEncoding::decode(ActualEncoded).first.getRawEncoding();
ASSERT_EQ(DecodedEncoded, Loc) << "Decoding " << ActualEncoded;
}
@@ -41,7 +42,8 @@ void roundTrip(std::vector<SourceLocation::UIntTy> Locs,
LocSeq::State Seq;
for (auto L : Locs)
ActualEncoded.push_back(SourceLocationEncoding::encode(
- SourceLocation::getFromRawEncoding(L), Seq));
+ SourceLocation::getFromRawEncoding(L), /*BaseOffset=*/0,
+ /*BaseModuleFileIndex=*/0, Seq));
if (!ExpectedEncoded.empty()) {
ASSERT_EQ(ActualEncoded, ExpectedEncoded)
<< "Encoding " << testing::PrintToString(Locs);
@@ -51,7 +53,7 @@ void roundTrip(std::vector<SourceLocation::UIntTy> Locs,
{
LocSeq::State Seq;
for (auto L : ActualEncoded) {
- SourceLocation Loc = SourceLocationEncoding::decode(L, Seq);
+ SourceLocation Loc = SourceLocationEncoding::decode(L, Seq).first;
DecodedEncoded.push_back(Loc.getRawEncoding());
}
ASSERT_EQ(DecodedEncoded, Locs)
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