[clang][Dependency Scanning][NFC] Move DependencyScanningAction to its own header and source files
#160795
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@llvm/pr-subscribers-clang Author: Qiongsi Wu (qiongsiwu) ChangesThis is the first of three PRs to implement #160207. This PR is NFC. It moves Patch is 50.18 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/160795.diff 4 Files Affected:
diff --git a/clang/lib/Tooling/DependencyScanning/CMakeLists.txt b/clang/lib/Tooling/DependencyScanning/CMakeLists.txt
index 42a63faa26d3e..433b3c6a013eb 100644
--- a/clang/lib/Tooling/DependencyScanning/CMakeLists.txt
+++ b/clang/lib/Tooling/DependencyScanning/CMakeLists.txt
@@ -10,6 +10,7 @@ add_clang_library(clangDependencyScanning
DependencyScanningService.cpp
DependencyScanningWorker.cpp
DependencyScanningTool.cpp
+ DependencyScanner.cpp
InProcessModuleCache.cpp
ModuleDepCollector.cpp
diff --git a/clang/lib/Tooling/DependencyScanning/DependencyScanner.cpp b/clang/lib/Tooling/DependencyScanning/DependencyScanner.cpp
new file mode 100644
index 0000000000000..a509a4311bc44
--- /dev/null
+++ b/clang/lib/Tooling/DependencyScanning/DependencyScanner.cpp
@@ -0,0 +1,526 @@
+//===- DependencyScanner.cpp - Performs module dependency scanning --------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "DependencyScanner.h"
+#include "clang/Basic/DiagnosticFrontend.h"
+#include "clang/Basic/DiagnosticSerialization.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Tooling/DependencyScanning/DependencyScanningWorker.h"
+
+using namespace clang;
+using namespace tooling;
+using namespace dependencies;
+
+namespace {
+/// Forwards the gatherered dependencies to the consumer.
+class DependencyConsumerForwarder : public DependencyFileGenerator {
+public:
+ DependencyConsumerForwarder(std::unique_ptr<DependencyOutputOptions> Opts,
+ StringRef WorkingDirectory, DependencyConsumer &C)
+ : DependencyFileGenerator(*Opts), WorkingDirectory(WorkingDirectory),
+ Opts(std::move(Opts)), C(C) {}
+
+ void finishedMainFile(DiagnosticsEngine &Diags) override {
+ C.handleDependencyOutputOpts(*Opts);
+ llvm::SmallString<256> CanonPath;
+ for (const auto &File : getDependencies()) {
+ CanonPath = File;
+ llvm::sys::path::remove_dots(CanonPath, /*remove_dot_dot=*/true);
+ llvm::sys::fs::make_absolute(WorkingDirectory, CanonPath);
+ C.handleFileDependency(CanonPath);
+ }
+ }
+
+private:
+ StringRef WorkingDirectory;
+ std::unique_ptr<DependencyOutputOptions> Opts;
+ DependencyConsumer &C;
+};
+
+class ScanningDependencyDirectivesGetter : public DependencyDirectivesGetter {
+ DependencyScanningWorkerFilesystem *DepFS;
+
+public:
+ ScanningDependencyDirectivesGetter(FileManager &FileMgr) : DepFS(nullptr) {
+ FileMgr.getVirtualFileSystem().visit([&](llvm::vfs::FileSystem &FS) {
+ auto *DFS = llvm::dyn_cast<DependencyScanningWorkerFilesystem>(&FS);
+ if (DFS) {
+ assert(!DepFS && "Found multiple scanning VFSs");
+ DepFS = DFS;
+ }
+ });
+ assert(DepFS && "Did not find scanning VFS");
+ }
+
+ std::unique_ptr<DependencyDirectivesGetter>
+ cloneFor(FileManager &FileMgr) override {
+ return std::make_unique<ScanningDependencyDirectivesGetter>(FileMgr);
+ }
+
+ std::optional<ArrayRef<dependency_directives_scan::Directive>>
+ operator()(FileEntryRef File) override {
+ return DepFS->getDirectiveTokens(File.getName());
+ }
+};
+
+static bool checkHeaderSearchPaths(const HeaderSearchOptions &HSOpts,
+ const HeaderSearchOptions &ExistingHSOpts,
+ DiagnosticsEngine *Diags,
+ const LangOptions &LangOpts) {
+ if (LangOpts.Modules) {
+ if (HSOpts.VFSOverlayFiles != ExistingHSOpts.VFSOverlayFiles) {
+ if (Diags) {
+ Diags->Report(diag::warn_pch_vfsoverlay_mismatch);
+ auto VFSNote = [&](int Type, ArrayRef<std::string> VFSOverlays) {
+ if (VFSOverlays.empty()) {
+ Diags->Report(diag::note_pch_vfsoverlay_empty) << Type;
+ } else {
+ std::string Files = llvm::join(VFSOverlays, "\n");
+ Diags->Report(diag::note_pch_vfsoverlay_files) << Type << Files;
+ }
+ };
+ VFSNote(0, HSOpts.VFSOverlayFiles);
+ VFSNote(1, ExistingHSOpts.VFSOverlayFiles);
+ }
+ }
+ }
+ return false;
+}
+
+using PrebuiltModuleFilesT = decltype(HeaderSearchOptions::PrebuiltModuleFiles);
+
+/// A listener that collects the imported modules and the input
+/// files. While visiting, collect vfsoverlays and file inputs that determine
+/// whether prebuilt modules fully resolve in stable directories.
+class PrebuiltModuleListener : public ASTReaderListener {
+public:
+ PrebuiltModuleListener(PrebuiltModuleFilesT &PrebuiltModuleFiles,
+ llvm::SmallVector<std::string> &NewModuleFiles,
+ PrebuiltModulesAttrsMap &PrebuiltModulesASTMap,
+ const HeaderSearchOptions &HSOpts,
+ const LangOptions &LangOpts, DiagnosticsEngine &Diags,
+ const ArrayRef<StringRef> StableDirs)
+ : PrebuiltModuleFiles(PrebuiltModuleFiles),
+ NewModuleFiles(NewModuleFiles),
+ PrebuiltModulesASTMap(PrebuiltModulesASTMap), ExistingHSOpts(HSOpts),
+ ExistingLangOpts(LangOpts), Diags(Diags), StableDirs(StableDirs) {}
+
+ bool needsImportVisitation() const override { return true; }
+ bool needsInputFileVisitation() override { return true; }
+ bool needsSystemInputFileVisitation() override { return true; }
+
+ /// Accumulate the modules are transitively depended on by the initial
+ /// prebuilt module.
+ void visitImport(StringRef ModuleName, StringRef Filename) override {
+ if (PrebuiltModuleFiles.insert({ModuleName.str(), Filename.str()}).second)
+ NewModuleFiles.push_back(Filename.str());
+
+ auto PrebuiltMapEntry = PrebuiltModulesASTMap.try_emplace(Filename);
+ PrebuiltModuleASTAttrs &PrebuiltModule = PrebuiltMapEntry.first->second;
+ if (PrebuiltMapEntry.second)
+ PrebuiltModule.setInStableDir(!StableDirs.empty());
+
+ if (auto It = PrebuiltModulesASTMap.find(CurrentFile);
+ It != PrebuiltModulesASTMap.end() && CurrentFile != Filename)
+ PrebuiltModule.addDependent(It->getKey());
+ }
+
+ /// For each input file discovered, check whether it's external path is in a
+ /// stable directory. Traversal is stopped if the current module is not
+ /// considered stable.
+ bool visitInputFileAsRequested(StringRef FilenameAsRequested,
+ StringRef Filename, bool isSystem,
+ bool isOverridden,
+ bool isExplicitModule) override {
+ if (StableDirs.empty())
+ return false;
+ auto PrebuiltEntryIt = PrebuiltModulesASTMap.find(CurrentFile);
+ if ((PrebuiltEntryIt == PrebuiltModulesASTMap.end()) ||
+ (!PrebuiltEntryIt->second.isInStableDir()))
+ return false;
+
+ PrebuiltEntryIt->second.setInStableDir(
+ isPathInStableDir(StableDirs, Filename));
+ return PrebuiltEntryIt->second.isInStableDir();
+ }
+
+ /// Update which module that is being actively traversed.
+ void visitModuleFile(StringRef Filename,
+ serialization::ModuleKind Kind) override {
+ // If the CurrentFile is not
+ // considered stable, update any of it's transitive dependents.
+ auto PrebuiltEntryIt = PrebuiltModulesASTMap.find(CurrentFile);
+ if ((PrebuiltEntryIt != PrebuiltModulesASTMap.end()) &&
+ !PrebuiltEntryIt->second.isInStableDir())
+ PrebuiltEntryIt->second.updateDependentsNotInStableDirs(
+ PrebuiltModulesASTMap);
+ CurrentFile = Filename;
+ }
+
+ /// Check the header search options for a given module when considering
+ /// if the module comes from stable directories.
+ bool ReadHeaderSearchOptions(const HeaderSearchOptions &HSOpts,
+ StringRef ModuleFilename,
+ StringRef SpecificModuleCachePath,
+ bool Complain) override {
+
+ auto PrebuiltMapEntry = PrebuiltModulesASTMap.try_emplace(CurrentFile);
+ PrebuiltModuleASTAttrs &PrebuiltModule = PrebuiltMapEntry.first->second;
+ if (PrebuiltMapEntry.second)
+ PrebuiltModule.setInStableDir(!StableDirs.empty());
+
+ if (PrebuiltModule.isInStableDir())
+ PrebuiltModule.setInStableDir(areOptionsInStableDir(StableDirs, HSOpts));
+
+ return false;
+ }
+
+ /// Accumulate vfsoverlays used to build these prebuilt modules.
+ bool ReadHeaderSearchPaths(const HeaderSearchOptions &HSOpts,
+ bool Complain) override {
+
+ auto PrebuiltMapEntry = PrebuiltModulesASTMap.try_emplace(CurrentFile);
+ PrebuiltModuleASTAttrs &PrebuiltModule = PrebuiltMapEntry.first->second;
+ if (PrebuiltMapEntry.second)
+ PrebuiltModule.setInStableDir(!StableDirs.empty());
+
+ PrebuiltModule.setVFS(
+ llvm::StringSet<>(llvm::from_range, HSOpts.VFSOverlayFiles));
+
+ return checkHeaderSearchPaths(
+ HSOpts, ExistingHSOpts, Complain ? &Diags : nullptr, ExistingLangOpts);
+ }
+
+private:
+ PrebuiltModuleFilesT &PrebuiltModuleFiles;
+ llvm::SmallVector<std::string> &NewModuleFiles;
+ PrebuiltModulesAttrsMap &PrebuiltModulesASTMap;
+ const HeaderSearchOptions &ExistingHSOpts;
+ const LangOptions &ExistingLangOpts;
+ DiagnosticsEngine &Diags;
+ std::string CurrentFile;
+ const ArrayRef<StringRef> StableDirs;
+};
+
+/// Transform arbitrary file name into an object-like file name.
+static std::string makeObjFileName(StringRef FileName) {
+ SmallString<128> ObjFileName(FileName);
+ llvm::sys::path::replace_extension(ObjFileName, "o");
+ return std::string(ObjFileName);
+}
+
+/// Deduce the dependency target based on the output file and input files.
+static std::string
+deduceDepTarget(const std::string &OutputFile,
+ const SmallVectorImpl<FrontendInputFile> &InputFiles) {
+ if (OutputFile != "-")
+ return OutputFile;
+
+ if (InputFiles.empty() || !InputFiles.front().isFile())
+ return "clang-scan-deps\\ dependency";
+
+ return makeObjFileName(InputFiles.front().getFile());
+}
+
+// Clang implements -D and -U by splatting text into a predefines buffer. This
+// allows constructs such as `-DFඞ=3 "-D F\u{0D9E} 4 3 2”` to be accepted and
+// define the same macro, or adding C++ style comments before the macro name.
+//
+// This function checks that the first non-space characters in the macro
+// obviously form an identifier that can be uniqued on without lexing. Failing
+// to do this could lead to changing the final definition of a macro.
+//
+// We could set up a preprocessor and actually lex the name, but that's very
+// heavyweight for a situation that will almost never happen in practice.
+static std::optional<StringRef> getSimpleMacroName(StringRef Macro) {
+ StringRef Name = Macro.split("=").first.ltrim(" \t");
+ std::size_t I = 0;
+
+ auto FinishName = [&]() -> std::optional<StringRef> {
+ StringRef SimpleName = Name.slice(0, I);
+ if (SimpleName.empty())
+ return std::nullopt;
+ return SimpleName;
+ };
+
+ for (; I != Name.size(); ++I) {
+ switch (Name[I]) {
+ case '(': // Start of macro parameter list
+ case ' ': // End of macro name
+ case '\t':
+ return FinishName();
+ case '_':
+ continue;
+ default:
+ if (llvm::isAlnum(Name[I]))
+ continue;
+ return std::nullopt;
+ }
+ }
+ return FinishName();
+}
+
+static void canonicalizeDefines(PreprocessorOptions &PPOpts) {
+ using MacroOpt = std::pair<StringRef, std::size_t>;
+ std::vector<MacroOpt> SimpleNames;
+ SimpleNames.reserve(PPOpts.Macros.size());
+ std::size_t Index = 0;
+ for (const auto &M : PPOpts.Macros) {
+ auto SName = getSimpleMacroName(M.first);
+ // Skip optimizing if we can't guarantee we can preserve relative order.
+ if (!SName)
+ return;
+ SimpleNames.emplace_back(*SName, Index);
+ ++Index;
+ }
+
+ llvm::stable_sort(SimpleNames, llvm::less_first());
+ // Keep the last instance of each macro name by going in reverse
+ auto NewEnd = std::unique(
+ SimpleNames.rbegin(), SimpleNames.rend(),
+ [](const MacroOpt &A, const MacroOpt &B) { return A.first == B.first; });
+ SimpleNames.erase(SimpleNames.begin(), NewEnd.base());
+
+ // Apply permutation.
+ decltype(PPOpts.Macros) NewMacros;
+ NewMacros.reserve(SimpleNames.size());
+ for (std::size_t I = 0, E = SimpleNames.size(); I != E; ++I) {
+ std::size_t OriginalIndex = SimpleNames[I].second;
+ // We still emit undefines here as they may be undefining a predefined macro
+ NewMacros.push_back(std::move(PPOpts.Macros[OriginalIndex]));
+ }
+ std::swap(PPOpts.Macros, NewMacros);
+}
+
+/// Visit the given prebuilt module and collect all of the modules it
+/// transitively imports and contributing input files.
+static bool visitPrebuiltModule(StringRef PrebuiltModuleFilename,
+ CompilerInstance &CI,
+ PrebuiltModuleFilesT &ModuleFiles,
+ PrebuiltModulesAttrsMap &PrebuiltModulesASTMap,
+ DiagnosticsEngine &Diags,
+ const ArrayRef<StringRef> StableDirs) {
+ // List of module files to be processed.
+ llvm::SmallVector<std::string> Worklist;
+
+ PrebuiltModuleListener Listener(ModuleFiles, Worklist, PrebuiltModulesASTMap,
+ CI.getHeaderSearchOpts(), CI.getLangOpts(),
+ Diags, StableDirs);
+
+ Listener.visitModuleFile(PrebuiltModuleFilename,
+ serialization::MK_ExplicitModule);
+ if (ASTReader::readASTFileControlBlock(
+ PrebuiltModuleFilename, CI.getFileManager(), CI.getModuleCache(),
+ CI.getPCHContainerReader(),
+ /*FindModuleFileExtensions=*/false, Listener,
+ /*ValidateDiagnosticOptions=*/false, ASTReader::ARR_OutOfDate))
+ return true;
+
+ while (!Worklist.empty()) {
+ Listener.visitModuleFile(Worklist.back(), serialization::MK_ExplicitModule);
+ if (ASTReader::readASTFileControlBlock(
+ Worklist.pop_back_val(), CI.getFileManager(), CI.getModuleCache(),
+ CI.getPCHContainerReader(),
+ /*FindModuleFileExtensions=*/false, Listener,
+ /*ValidateDiagnosticOptions=*/false))
+ return true;
+ }
+ return false;
+}
+
+} // namespace
+
+/// Sanitize diagnostic options for dependency scan.
+void clang::tooling::dependencies::sanitizeDiagOpts(
+ DiagnosticOptions &DiagOpts) {
+ // Don't print 'X warnings and Y errors generated'.
+ DiagOpts.ShowCarets = false;
+ // Don't write out diagnostic file.
+ DiagOpts.DiagnosticSerializationFile.clear();
+ // Don't emit warnings except for scanning specific warnings.
+ // TODO: It would be useful to add a more principled way to ignore all
+ // warnings that come from source code. The issue is that we need to
+ // ignore warnings that could be surpressed by
+ // `#pragma clang diagnostic`, while still allowing some scanning
+ // warnings for things we're not ready to turn into errors yet.
+ // See `test/ClangScanDeps/diagnostic-pragmas.c` for an example.
+ llvm::erase_if(DiagOpts.Warnings, [](StringRef Warning) {
+ return llvm::StringSwitch<bool>(Warning)
+ .Cases("pch-vfs-diff", "error=pch-vfs-diff", false)
+ .StartsWith("no-error=", false)
+ .Default(true);
+ });
+}
+
+bool DependencyScanningAction::runInvocation(
+ std::shared_ptr<CompilerInvocation> Invocation,
+ IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS,
+ std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+ DiagnosticConsumer *DiagConsumer) {
+ // Making sure that we canonicalize the defines before we create the deep
+ // copy to avoid unnecessary variants in the scanner and in the resulting
+ // explicit command lines.
+ if (any(Service.getOptimizeArgs() & ScanningOptimizations::Macros))
+ canonicalizeDefines(Invocation->getPreprocessorOpts());
+
+ // Make a deep copy of the original Clang invocation.
+ CompilerInvocation OriginalInvocation(*Invocation);
+
+ if (Scanned) {
+ // Scanning runs once for the first -cc1 invocation in a chain of driver
+ // jobs. For any dependent jobs, reuse the scanning result and just
+ // update the LastCC1Arguments to correspond to the new invocation.
+ // FIXME: to support multi-arch builds, each arch requires a separate scan
+ setLastCC1Arguments(std::move(OriginalInvocation));
+ return true;
+ }
+
+ Scanned = true;
+
+ // Create a compiler instance to handle the actual work.
+ auto ModCache = makeInProcessModuleCache(Service.getModuleCacheEntries());
+ ScanInstanceStorage.emplace(std::move(Invocation), std::move(PCHContainerOps),
+ ModCache.get());
+ CompilerInstance &ScanInstance = *ScanInstanceStorage;
+ ScanInstance.setBuildingModule(false);
+
+ ScanInstance.createVirtualFileSystem(FS, DiagConsumer);
+
+ // Create the compiler's actual diagnostics engine.
+ sanitizeDiagOpts(ScanInstance.getDiagnosticOpts());
+ assert(!DiagConsumerFinished && "attempt to reuse finished consumer");
+ ScanInstance.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
+ if (!ScanInstance.hasDiagnostics())
+ return false;
+
+ ScanInstance.getPreprocessorOpts().AllowPCHWithDifferentModulesCachePath =
+ true;
+
+ if (ScanInstance.getHeaderSearchOpts().ModulesValidateOncePerBuildSession)
+ ScanInstance.getHeaderSearchOpts().BuildSessionTimestamp =
+ Service.getBuildSessionTimestamp();
+
+ ScanInstance.getFrontendOpts().DisableFree = false;
+ ScanInstance.getFrontendOpts().GenerateGlobalModuleIndex = false;
+ ScanInstance.getFrontendOpts().UseGlobalModuleIndex = false;
+ // This will prevent us compiling individual modules asynchronously since
+ // FileManager is not thread-safe, but it does improve performance for now.
+ ScanInstance.getFrontendOpts().ModulesShareFileManager = true;
+ ScanInstance.getHeaderSearchOpts().ModuleFormat = "raw";
+ ScanInstance.getHeaderSearchOpts().ModulesIncludeVFSUsage =
+ any(Service.getOptimizeArgs() & ScanningOptimizations::VFS);
+
+ // Create a new FileManager to match the invocation's FileSystemOptions.
+ auto *FileMgr = ScanInstance.createFileManager();
+
+ // Use the dependency scanning optimized file system if requested to do so.
+ if (DepFS) {
+ DepFS->resetBypassedPathPrefix();
+ if (!ScanInstance.getHeaderSearchOpts().ModuleCachePath.empty()) {
+ SmallString<256> ModulesCachePath;
+ normalizeModuleCachePath(
+ *FileMgr, ScanInstance.getHeaderSearchOpts().ModuleCachePath,
+ ModulesCachePath);
+ DepFS->setBypassedPathPrefix(ModulesCachePath);
+ }
+
+ ScanInstance.setDependencyDirectivesGetter(
+ std::make_unique<ScanningDependencyDirectivesGetter>(*FileMgr));
+ }
+
+ ScanInstance.createSourceManager(*FileMgr);
+
+ // Create a collection of stable directories derived from the ScanInstance
+ // for determining whether module dependencies would fully resolve from
+ // those directories.
+ llvm::SmallVector<StringRef> StableDirs;
+ const StringRef Sysroot = ScanInstance.getHeaderSearchOpts().Sysroot;
+ if (!Sysroot.empty() && (llvm::sys::path::root_directory(Sysroot) != Sysroot))
+ StableDirs = {Sysroot, ScanInstance.getHeaderSearchOpts().ResourceDir};
+
+ // Store a mapping of prebuilt module files and their properties like header
+ // search options. This will prevent the implicit build to create duplicate
+ // modules and will force reuse of the existing prebuilt module files
+ // instead.
+ PrebuiltModulesAttrsMap PrebuiltModulesASTMap;
+
+ if (!ScanInstance.getPreprocessorOpts().ImplicitPCHInclude.empty())
+ if (visitPrebuiltModule(
+ ScanInstance.getPreprocessorOpts().ImplicitPCHInclude, ScanInstance,
+ ScanInstance.getHeaderSearchOpts().PrebuiltModuleFiles,
+ PrebuiltModulesASTMap, ScanInstance.getDiagnostics(), StableDirs))
+ return false;
+
+ // Create the dependency collector that will collect the produced
+ // dependencies.
+ //
+ // This also moves the existing dependency output options from the
+ // invocation to the collector. The options in the invocation are reset,
+ // which ensures that the co...
[truncated]
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I don't think we need to expose I also named the new files |
qiongsiwu
requested review from
Bigcheese,
benlangmuir,
cachemeifyoucan and
jansvoboda11
jansvoboda11
approved these changes
Sep 26, 2025
There was a problem hiding this comment.
Looks good overall, but I have some minor nits to consider:
- A couple of symbols (
visitPrebuiltModule(),sanitizeDiagOpts(),ScanningDependencyDirectivesGetter) moved around. I'd prefer if we kept the changes to the sources to the minimum for now and kept the ordering. (Runninggit-clang-formatis fine by me). - Newly-added files aren't newline-terminated.
- I'd probably rename the new files to
DependencyScannerImpl.{h,cpp}orDependencyScanningAction.{h.cpp}. JustDependencyScanner.hlooks like a top-level client header rather than an implementation detail.
|
Thanks so much for the prompt review! The latest commit:
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/169/builds/15356 Here is the relevant piece of the build log for the reference |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/186/builds/12721 Here is the relevant piece of the build log for the reference |
mahesh-attarde
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Oct 3, 2025
…its own header and source files (llvm#160795) This is the first of three PRs to land llvm#160207 in smaller pieces. This PR is an NFC. It moves `DependencyScanningAction` to its own source file, so we can later implement a `CompilerInstanceWithContext` in the new file. Part of work for rdar://136303612.
qiongsiwu
added a commit
that referenced
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Oct 3, 2025
…ialization (#161300) This PR follows #160795, and it is the second of a series of planned PRs to land #160207 in smaller pieces. The initialization steps before and within `DependencyScanningAction::runInvocation` are broken up in to several helper functions. The intention is to reuse the helper functions in a followup PR to initialize the `CompilerInstanceWithContext`. Part of work for rdar://136303612.
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…stance Initialization (#161300) This PR follows llvm/llvm-project#160795, and it is the second of a series of planned PRs to land llvm/llvm-project#160207 in smaller pieces. The initialization steps before and within `DependencyScanningAction::runInvocation` are broken up in to several helper functions. The intention is to reuse the helper functions in a followup PR to initialize the `CompilerInstanceWithContext`. Part of work for rdar://136303612.
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This is the first of three PRs to land #160207 in smaller pieces.
This PR is an NFC. It moves
DependencyScanningActionto its own source file, so we can later implement aCompilerInstanceWithContextin the new file.Part of work for rdar://136303612.