https://github.com/jansvoboda11 created
https://github.com/llvm/llvm-project/pull/74892
AFAICT, `ModuleFile::File` can be `std::nullopt` only for PCM files loaded from
the standard input. This patch starts setting that variable to
`FileManager::getSTDIN()` in that case, which makes it possible to remove the
optionality, and also simplifies code that actually reads the file.
This is part of an effort to get rid of
`Optional{File,Directory}EntryRefDegradesTo{File,Directory}EntryPtr`.
>From fb5c8c9fe856aaa2a314effa26486d5fbf019140 Mon Sep 17 00:00:00 2001
From: Jan Svoboda <jan_svob...@apple.com>
Date: Thu, 7 Dec 2023 14:04:35 -0800
Subject: [PATCH] [clang] NFCI: Make `ModuleFile::File` non-optional
---
.../include/clang/Serialization/ModuleFile.h | 6 +--
clang/lib/Serialization/ASTReader.cpp | 2 +-
clang/lib/Serialization/ASTWriter.cpp | 2 +-
clang/lib/Serialization/GlobalModuleIndex.cpp | 4 +-
clang/lib/Serialization/ModuleManager.cpp | 54 ++++++++-----------
5 files changed, 29 insertions(+), 39 deletions(-)
diff --git a/clang/include/clang/Serialization/ModuleFile.h
b/clang/include/clang/Serialization/ModuleFile.h
index 48be8676cc26a4..70ab61dec8b6bf 100644
--- a/clang/include/clang/Serialization/ModuleFile.h
+++ b/clang/include/clang/Serialization/ModuleFile.h
@@ -123,8 +123,8 @@ class InputFile {
/// other modules.
class ModuleFile {
public:
- ModuleFile(ModuleKind Kind, unsigned Generation)
- : Kind(Kind), Generation(Generation) {}
+ ModuleFile(ModuleKind Kind, FileEntryRef File, unsigned Generation)
+ : Kind(Kind), File(File), Generation(Generation) {}
~ModuleFile();
// === General information ===
@@ -176,7 +176,7 @@ class ModuleFile {
bool DidReadTopLevelSubmodule = false;
/// The file entry for the module file.
- OptionalFileEntryRefDegradesToFileEntryPtr File;
+ FileEntryRef File;
/// The signature of the module file, which may be used instead of the size
/// and modification time to identify this particular file.
diff --git a/clang/lib/Serialization/ASTReader.cpp
b/clang/lib/Serialization/ASTReader.cpp
index f22da838424b41..49f25d6648c801 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -5786,7 +5786,7 @@ llvm::Error ASTReader::ReadSubmoduleBlock(ModuleFile &F,
PartialDiagnostic(diag::err_module_file_conflict,
ContextObj->DiagAllocator)
<< CurrentModule->getTopLevelModuleName() << CurFile->getName()
- << F.File->getName();
+ << F.File.getName();
return DiagnosticError::create(CurrentImportLoc, ConflictError);
}
}
diff --git a/clang/lib/Serialization/ASTWriter.cpp
b/clang/lib/Serialization/ASTWriter.cpp
index 6df815234e235f..38e8b8ccbe058d 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -1413,7 +1413,7 @@ void ASTWriter::WriteControlBlock(Preprocessor &PP,
ASTContext &Context,
// If we have calculated signature, there is no need to store
// the size or timestamp.
- Record.push_back(M.Signature ? 0 : M.File->getSize());
+ Record.push_back(M.Signature ? 0 : M.File.getSize());
Record.push_back(M.Signature ? 0 : getTimestampForOutput(M.File));
llvm::append_range(Record, M.Signature);
diff --git a/clang/lib/Serialization/GlobalModuleIndex.cpp
b/clang/lib/Serialization/GlobalModuleIndex.cpp
index fb80a1998d0efe..dd4fc3e009050f 100644
--- a/clang/lib/Serialization/GlobalModuleIndex.cpp
+++ b/clang/lib/Serialization/GlobalModuleIndex.cpp
@@ -342,8 +342,8 @@ bool GlobalModuleIndex::loadedModuleFile(ModuleFile *File) {
// If the size and modification time match what we expected, record this
// module file.
bool Failed = true;
- if (File->File->getSize() == Info.Size &&
- File->File->getModificationTime() == Info.ModTime) {
+ if (File->File.getSize() == Info.Size &&
+ File->File.getModificationTime() == Info.ModTime) {
Info.File = File;
ModulesByFile[File] = Known->second;
diff --git a/clang/lib/Serialization/ModuleManager.cpp
b/clang/lib/Serialization/ModuleManager.cpp
index de4cd3d05853ac..7cf97125b8ef03 100644
--- a/clang/lib/Serialization/ModuleManager.cpp
+++ b/clang/lib/Serialization/ModuleManager.cpp
@@ -108,7 +108,7 @@ ModuleManager::addModule(StringRef FileName, ModuleKind
Type,
// Look for the file entry. This only fails if the expected size or
// modification time differ.
- OptionalFileEntryRefDegradesToFileEntryPtr Entry;
+ OptionalFileEntryRef Entry;
if (Type == MK_ExplicitModule || Type == MK_PrebuiltModule) {
// If we're not expecting to pull this file out of the module cache, it
// might have a different mtime due to being moved across filesystems in
@@ -123,7 +123,7 @@ ModuleManager::addModule(StringRef FileName, ModuleKind
Type,
return OutOfDate;
}
- if (!Entry && FileName != "-") {
+ if (!Entry) {
ErrorStr = "module file not found";
return Missing;
}
@@ -150,7 +150,7 @@ ModuleManager::addModule(StringRef FileName, ModuleKind
Type,
};
// Check whether we already loaded this module, before
- if (ModuleFile *ModuleEntry = Modules.lookup(Entry)) {
+ if (ModuleFile *ModuleEntry = Modules.lookup(*Entry)) {
if (implicitModuleNamesMatch(Type, ModuleEntry, *Entry)) {
// Check the stored signature.
if (checkSignature(ModuleEntry->Signature, ExpectedSignature, ErrorStr))
@@ -163,10 +163,9 @@ ModuleManager::addModule(StringRef FileName, ModuleKind
Type,
}
// Allocate a new module.
- auto NewModule = std::make_unique<ModuleFile>(Type, Generation);
+ auto NewModule = std::make_unique<ModuleFile>(Type, *Entry, Generation);
NewModule->Index = Chain.size();
NewModule->FileName = FileName.str();
- NewModule->File = Entry;
NewModule->ImportLoc = ImportLoc;
NewModule->InputFilesValidationTimestamp = 0;
@@ -198,21 +197,15 @@ ModuleManager::addModule(StringRef FileName, ModuleKind
Type,
Entry->closeFile();
return OutOfDate;
} else {
- // Open the AST file.
- llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
Buf((std::error_code()));
- if (FileName == "-") {
- Buf = llvm::MemoryBuffer::getSTDIN();
- } else {
- // Get a buffer of the file and close the file descriptor when done.
- // The file is volatile because in a parallel build we expect multiple
- // compiler processes to use the same module file rebuilding it if
needed.
- //
- // RequiresNullTerminator is false because module files don't need it,
and
- // this allows the file to still be mmapped.
- Buf = FileMgr.getBufferForFile(*NewModule->File,
- /*IsVolatile=*/true,
- /*RequiresNullTerminator=*/false);
- }
+ // Get a buffer of the file and close the file descriptor when done.
+ // The file is volatile because in a parallel build we expect multiple
+ // compiler processes to use the same module file rebuilding it if needed.
+ //
+ // RequiresNullTerminator is false because module files don't need it, and
+ // this allows the file to still be mmapped.
+ auto Buf = FileMgr.getBufferForFile(NewModule->File,
+ /*IsVolatile=*/true,
+ /*RequiresNullTerminator=*/false);
if (!Buf) {
ErrorStr = Buf.getError().message();
@@ -232,7 +225,7 @@ ModuleManager::addModule(StringRef FileName, ModuleKind
Type,
return OutOfDate;
// We're keeping this module. Store it everywhere.
- Module = Modules[Entry] = NewModule.get();
+ Module = Modules[*Entry] = NewModule.get();
updateModuleImports(*NewModule, ImportedBy, ImportLoc);
@@ -441,22 +434,19 @@ void
ModuleManager::visit(llvm::function_ref<bool(ModuleFile &M)> Visitor,
bool ModuleManager::lookupModuleFile(StringRef FileName, off_t ExpectedSize,
time_t ExpectedModTime,
OptionalFileEntryRef &File) {
- File = std::nullopt;
- if (FileName == "-")
+ if (FileName == "-") {
+ File = expectedToOptional(FileMgr.getSTDIN());
return false;
+ }
// Open the file immediately to ensure there is no race between stat'ing and
// opening the file.
- OptionalFileEntryRef FileOrErr =
- expectedToOptional(FileMgr.getFileRef(FileName, /*OpenFile=*/true,
- /*CacheFailure=*/false));
- if (!FileOrErr)
- return false;
-
- File = *FileOrErr;
+ File = expectedToOptional(FileMgr.getFileRef(FileName, /*OpenFile=*/true,
+ /*CacheFailure=*/false));
- if ((ExpectedSize && ExpectedSize != File->getSize()) ||
- (ExpectedModTime && ExpectedModTime != File->getModificationTime()))
+ if (File &&
+ ((ExpectedSize && ExpectedSize != File->getSize()) ||
+ (ExpectedModTime && ExpectedModTime != File->getModificationTime())))
// Do not destroy File, as it may be referenced. If we need to rebuild it,
// it will be destroyed by removeModules.
return true;
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