[Tooling] Print the progress when there are multiple files to process

[hokein]

Running clang tools on a single file can be slow. It is even worse when running multiple files, to improve the user experience, we print the processing status.

[llvmbot]

@llvm/pr-subscribers-clang

Author: Haojian Wu (hokein)

Changes

Running clang tools on a single file can be slow. It is even worse when running multiple files, to improve the user experience, we print the processing status.

---

Full diff: https://github.com/llvm/llvm-project/pull/75904.diff

1 Files Affected:

• (modified) clang/lib/Tooling/Tooling.cpp (+7-1)

diff --git a/clang/lib/Tooling/Tooling.cpp b/clang/lib/Tooling/Tooling.cpp
index 33bfa8d3d81f1e..92068d04ba5460 100644
--- a/clang/lib/Tooling/Tooling.cpp
+++ b/clang/lib/Tooling/Tooling.cpp
@@ -556,6 +556,8 @@ int ClangTool::run(ToolAction *Action) {
                  << CWD.getError().message() << "\n";
   }
 
+  size_t NumOfTotalFiles = AbsolutePaths.size();
+  unsigned ProcessedFileCounter = 0;
   for (llvm::StringRef File : AbsolutePaths) {
     // Currently implementations of CompilationDatabase::getCompileCommands can
     // change the state of the file system (e.g.  prepare generated headers), so
@@ -611,7 +613,11 @@ int ClangTool::run(ToolAction *Action) {
 
       // FIXME: We need a callback mechanism for the tool writer to output a
       // customized message for each file.
-      LLVM_DEBUG({ llvm::dbgs() << "Processing: " << File << ".\n"; });
+      if (NumOfTotalFiles > 1)
+        llvm::errs() << "[" + std::to_string(++ProcessedFileCounter) + "/" +
+                            std::to_string(NumOfTotalFiles) +
+                            "] Processing file " + File
+                     << ".\n";
       ToolInvocation Invocation(std::move(CommandLine), Action, Files.get(),
                                 PCHContainerOps);
       Invocation.setDiagnosticConsumer(DiagConsumer);

[kadircet]

thanks, lgtm!