[clang] Pull some utility functions into CompilerInvocation NFC

Move copying compiler arguments to a vector<string> and modifying
common module-related options into CompilerInvocation in preparation for
using some of them in more places and to avoid duplicating this code
accidentally in the future.

Differential Revision: https://reviews.llvm.org/D132419

3 files changed, 35 insertions, 32 deletions

diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index e3b5447..03b5d04 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -1150,8 +1150,7 @@ compileModuleImpl(CompilerInstance &ImportingInstance, SourceLocation ImportLoc,
 
   // For any options that aren't intended to affect how a module is built,
   // reset them to their default values.
-  Invocation->getLangOpts()->resetNonModularOptions();
-  PPOpts.resetNonModularOptions();
+  Invocation->resetNonModularOptions();
 
   // Remove any macro definitions that are explicitly ignored by the module.
   // They aren't supposed to affect how the module is built anyway.
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 9731d40..7e6d0cd 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -4672,6 +4672,37 @@ void CompilerInvocation::generateCC1CommandLine(
   GenerateDependencyOutputArgs(DependencyOutputOpts, Args, SA);
 }
 
+std::vector<std::string> CompilerInvocation::getCC1CommandLine() const {
+  // Set up string allocator.
+  llvm::BumpPtrAllocator Alloc;
+  llvm::StringSaver Strings(Alloc);
+  auto SA = [&Strings](const Twine &Arg) { return Strings.save(Arg).data(); };
+
+  // Synthesize full command line from the CompilerInvocation, including "-cc1".
+  SmallVector<const char *, 32> Args{"-cc1"};
+  generateCC1CommandLine(Args, SA);
+
+  // Convert arguments to the return type.
+  return std::vector<std::string>{Args.begin(), Args.end()};
+}
+
+void CompilerInvocation::resetNonModularOptions() {
+  getLangOpts()->resetNonModularOptions();
+  getPreprocessorOpts().resetNonModularOptions();
+}
+
+void CompilerInvocation::clearImplicitModuleBuildOptions() {
+  getLangOpts()->ImplicitModules = false;
+  getHeaderSearchOpts().ImplicitModuleMaps = false;
+  getHeaderSearchOpts().ModuleCachePath.clear();
+  getHeaderSearchOpts().ModulesValidateOncePerBuildSession = false;
+  getHeaderSearchOpts().BuildSessionTimestamp = 0;
+  // The specific values we canonicalize to for pruning don't affect behaviour,
+  /// so use the default values so they may be dropped from the command-line.
+  getHeaderSearchOpts().ModuleCachePruneInterval = 7 * 24 * 60 * 60;
+  getHeaderSearchOpts().ModuleCachePruneAfter = 31 * 24 * 60 * 60;
+}
+
 IntrusiveRefCntPtr<llvm::vfs::FileSystem>
 clang::createVFSFromCompilerInvocation(const CompilerInvocation &CI,
                                        DiagnosticsEngine &Diags) {
diff --git a/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp b/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
index db1489f..f2de018 100644
--- a/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
+++ b/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
@@ -98,8 +98,8 @@ ModuleDepCollector::makeInvocationForModuleBuildWithoutOutputs(
   // Make a deep copy of the original Clang invocation.
   CompilerInvocation CI(OriginalInvocation);
 
-  CI.getLangOpts()->resetNonModularOptions();
-  CI.getPreprocessorOpts().resetNonModularOptions();
+  CI.resetNonModularOptions();
+  CI.clearImplicitModuleBuildOptions();
 
   // Remove options incompatible with explicit module build or are likely to
   // differ between identical modules discovered from different translation
@@ -120,18 +120,6 @@ ModuleDepCollector::makeInvocationForModuleBuildWithoutOutputs(
   CI.getLangOpts()->ModuleName = Deps.ID.ModuleName;
   CI.getFrontendOpts().IsSystemModule = Deps.IsSystem;
 
-  // Disable implicit modules and canonicalize options that are only used by
-  // implicit modules.
-  CI.getLangOpts()->ImplicitModules = false;
-  CI.getHeaderSearchOpts().ImplicitModuleMaps = false;
-  CI.getHeaderSearchOpts().ModuleCachePath.clear();
-  CI.getHeaderSearchOpts().ModulesValidateOncePerBuildSession = false;
-  CI.getHeaderSearchOpts().BuildSessionTimestamp = 0;
-  // The specific values we canonicalize to for pruning don't affect behaviour,
-  /// so use the default values so they will be dropped from the command-line.
-  CI.getHeaderSearchOpts().ModuleCachePruneInterval = 7 * 24 * 60 * 60;
-  CI.getHeaderSearchOpts().ModuleCachePruneAfter = 31 * 24 * 60 * 60;
-
   // Inputs
   InputKind ModuleMapInputKind(CI.getFrontendOpts().DashX.getLanguage(),
                                InputKind::Format::ModuleMap);
@@ -182,23 +170,8 @@ ModuleDepCollector::makeInvocationForModuleBuildWithoutOutputs(
   return CI;
 }
 
-static std::vector<std::string>
-serializeCompilerInvocation(const CompilerInvocation &CI) {
-  // Set up string allocator.
-  llvm::BumpPtrAllocator Alloc;
-  llvm::StringSaver Strings(Alloc);
-  auto SA = [&Strings](const Twine &Arg) { return Strings.save(Arg).data(); };
-
-  // Synthesize full command line from the CompilerInvocation, including "-cc1".
-  SmallVector<const char *, 32> Args{"-cc1"};
-  CI.generateCC1CommandLine(Args, SA);
-
-  // Convert arguments to the return type.
-  return std::vector<std::string>{Args.begin(), Args.end()};
-}
-
 std::vector<std::string> ModuleDeps::getCanonicalCommandLine() const {
-  return serializeCompilerInvocation(BuildInvocation);
+  return BuildInvocation.getCC1CommandLine();
 }
 
 static std::string getModuleContextHash(const ModuleDeps &MD,