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[clangd] [Modules] Use ASTReader directly in IsModuleFileUpToDate #113879

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Oct 31, 2024
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[clangd] [Modules] Use ASTReader directly in IsModuleFileUpToDate #113879

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[clangd] [Modules] Use ASTReader directly in IsModuleFileUpToDate
ChuanqiXu9 Oct 28, 2024
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ChuanqiXu9 Oct 29, 2024
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ChuanqiXu9 Oct 30, 2024
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ChuanqiXu9 Oct 30, 2024
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63 changes: 41 additions & 22 deletions clang-tools-extra/clangd/ModulesBuilder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
#include "clang/Frontend/FrontendAction.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Serialization/ASTReader.h"
#include "clang/Serialization/InMemoryModuleCache.h"

namespace clang {
namespace clangd {
Expand Down Expand Up @@ -127,50 +128,68 @@ struct ModuleFile {
std::string ModuleFilePath;
};

bool IsModuleFileUpToDate(
PathRef ModuleFilePath,
const PrerequisiteModules &RequisiteModules) {
IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
CompilerInstance::createDiagnostics(new DiagnosticOptions());

bool IsModuleFileUpToDate(PathRef ModuleFilePath,
const PrerequisiteModules &RequisiteModules,
llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
auto HSOpts = std::make_shared<HeaderSearchOptions>();
RequisiteModules.adjustHeaderSearchOptions(*HSOpts);
HSOpts->ForceCheckCXX20ModulesInputFiles = true;
HSOpts->ValidateASTInputFilesContent = true;

clang::clangd::IgnoreDiagnostics IgnoreDiags;
IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
CompilerInstance::createDiagnostics(new DiagnosticOptions, &IgnoreDiags,
/*ShouldOwnClient=*/false);

LangOptions LangOpts;
LangOpts.SkipODRCheckInGMF = true;

FileManager FileMgr(FileSystemOptions(), VFS);

SourceManager SourceMgr(*Diags, FileMgr);

HeaderSearch HeaderInfo(HSOpts, SourceMgr, *Diags, LangOpts,
/*Target=*/nullptr);

TrivialModuleLoader ModuleLoader;
Preprocessor PP(std::make_shared<PreprocessorOptions>(), *Diags, LangOpts,
SourceMgr, HeaderInfo, ModuleLoader);

IntrusiveRefCntPtr<InMemoryModuleCache> ModuleCache = new InMemoryModuleCache;
PCHContainerOperations PCHOperations;
std::unique_ptr<ASTUnit> Unit = ASTUnit::LoadFromASTFile(
ModuleFilePath.str(), PCHOperations.getRawReader(), ASTUnit::LoadASTOnly,
Diags, FileSystemOptions(), std::move(HSOpts));
ASTReader Reader(PP, *ModuleCache, /*ASTContext=*/nullptr,
PCHOperations.getRawReader(), {});

if (!Unit)
return false;
// We don't need any listener here. By default it will use a validator
// listener.
Reader.setListener(nullptr);

auto Reader = Unit->getASTReader();
if (!Reader)
if (Reader.ReadAST(ModuleFilePath, serialization::MK_MainFile,
SourceLocation(),
ASTReader::ARR_None) != ASTReader::Success)
return false;

bool UpToDate = true;
Reader->getModuleManager().visit([&](serialization::ModuleFile &MF) -> bool {
Reader->visitInputFiles(
Reader.getModuleManager().visit([&](serialization::ModuleFile &MF) -> bool {
Reader.visitInputFiles(
MF, /*IncludeSystem=*/false, /*Complain=*/false,
[&](const serialization::InputFile &IF, bool isSystem) {
if (!IF.getFile() || IF.isOutOfDate())
UpToDate = false;
});

return !UpToDate;
});

return UpToDate;
}

bool IsModuleFilesUpToDate(
llvm::SmallVector<PathRef> ModuleFilePaths,
const PrerequisiteModules &RequisiteModules) {
return llvm::all_of(ModuleFilePaths, [&RequisiteModules](auto ModuleFilePath) {
return IsModuleFileUpToDate(ModuleFilePath, RequisiteModules);
});
const PrerequisiteModules &RequisiteModules,
llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
return llvm::all_of(
ModuleFilePaths, [&RequisiteModules, VFS](auto ModuleFilePath) {
return IsModuleFileUpToDate(ModuleFilePath, RequisiteModules, VFS);
});
}

// StandalonePrerequisiteModules - stands for PrerequisiteModules for which all
Expand Down Expand Up @@ -347,7 +366,7 @@ bool StandalonePrerequisiteModules::canReuse(
SmallVector<StringRef> BMIPaths;
for (auto &MF : RequiredModules)
BMIPaths.push_back(MF.ModuleFilePath);
return IsModuleFilesUpToDate(BMIPaths, *this);
return IsModuleFilesUpToDate(BMIPaths, *this, VFS);
}

} // namespace clangd
Expand Down
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