[Clangd][NFC] Normalize all file path root names

[EcutAtom336]

Normalize all file path root names in GlobalChanges to uppercase to avoid case-sensitive copying on Windows. This will cause vscode-clangd to be unable to rename symbols (renaming cannot apply modifications).

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[llvmbot]

@llvm/pr-subscribers-clang-tools-extra

@llvm/pr-subscribers-clangd

Author: zhujiatao (EcutAtom336)

Changes

Normalize all file path root names in GlobalChanges to uppercase to avoid case-sensitive copying on Windows. This will cause vscode-clangd to be unable to rename symbols (renaming cannot apply modifications).

---

Full diff: https://github.com/llvm/llvm-project/pull/153736.diff

1 Files Affected:

• (modified) clang-tools-extra/clangd/refactor/Rename.cpp (+20)

diff --git a/clang-tools-extra/clangd/refactor/Rename.cpp b/clang-tools-extra/clangd/refactor/Rename.cpp
index c56375b1a98d3..6b2b38caf15fd 100644
--- a/clang-tools-extra/clangd/refactor/Rename.cpp
+++ b/clang-tools-extra/clangd/refactor/Rename.cpp
@@ -31,12 +31,16 @@
 #include "clang/Tooling/Syntax/Tokens.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/JSON.h"
+#include "llvm/Support/Path.h"
 #include <algorithm>
 #include <optional>
+#include <string>
 
 namespace clang {
 namespace clangd {
@@ -1196,6 +1200,22 @@ llvm::Expected<RenameResult> rename(const RenameInputs &RInputs) {
   // Attach the rename edits for the main file.
   Result.GlobalChanges.try_emplace(RInputs.MainFilePath,
                                    std::move(MainFileEdits));
+
+#if defined(_WIN32) || defined(_WIN64)
+  // Normalize all file path root names in GlobalChanges to uppercase to avoid
+  // Case-sensitive replication on Windows.
+  FileEdits Normalized;
+  for (auto &Entry : Result.GlobalChanges) {
+    std::string Key = Entry.first().str();
+    llvm::sys::path::convert_to_slash(Key);
+    if (llvm::sys::path::has_root_name(llvm::Twine(Key))) {
+      Key[0] = llvm::toUpper(Key[0]);
+    }
+    Normalized[Key] = std::move(Entry.second);
+  }
+  Result.GlobalChanges.swap(Normalized);
+#endif // defined(_WIN32) || defined(_WIN64)
+
   return Result;
 }
 

[HighCommander4]

Making this change in code specific to the "rename" operation is just going to address one symptom of a larger underlying problem, which is clangd/clangd#108.

A more comprehensive fix for the underlying issue is being worked on in #136439.