[clang-tools-extra] [clang-tidy][modernize-use-using]fix function pointer typedef correctly (PR #65558)

[Congcong Cai via cfe-commits]

https://github.com/HerrCai0907 created https://github.com/llvm/llvm-project/pull/65558:

Fixed #65055


>From f25a855ac2d3ec4b89f55a08e415596b3b65f142 Mon Sep 17 00:00:00 2001
From: Congcong Cai <congcongcai0907 at 163.com>
Date: Thu, 7 Sep 2023 10:14:28 +0800
Subject: [PATCH] [clang-tidy][modernize-use-using]fix function pointer typedef
 correctly

---
 clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp   | 6 ++++--
 clang-tools-extra/docs/ReleaseNotes.rst                    | 3 +++
 .../test/clang-tidy/checkers/modernize/use-using.cpp       | 7 +++++++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp b/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
index c1af8b5bfa11cac..22dc9e21cab9d5a 100644
--- a/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
@@ -120,8 +120,10 @@ void UseUsingCheck::check(const MatchFinder::MatchResult &Result) {
         Type.substr(0, FirstTypedefType.size()) == FirstTypedefType)
       Type = FirstTypedefName + Type.substr(FirstTypedefType.size() + 1);
   }
-  if (!ReplaceRange.getEnd().isMacroID())
-    LastReplacementEnd = ReplaceRange.getEnd().getLocWithOffset(Name.size());
+  if (!ReplaceRange.getEnd().isMacroID()) {
+    const SourceLocation::IntTy Offset = MatchedDecl->getFunctionType() ? 0 : Name.size();
+    LastReplacementEnd = ReplaceRange.getEnd().getLocWithOffset(Offset);
+  }
 
   auto Diag = diag(ReplaceRange.getBegin(), UseUsingWarning);
 
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index a2cde526a8c04d9..90a782fa53b257d 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -246,6 +246,9 @@ Changes in existing checks
   <clang-tidy/checks/modernize/use-std-print>` check to accurately generate
   fixes for reordering arguments.
 
+- Improved :doc:`modernize-use-using<clang-tidy/checks/modernize/use-using>` 
+  check to fix function pointer ``typedef`` correctly.
+
 - Improved :doc:`performance-faster-string-find
   <clang-tidy/checks/performance/faster-string-find>` check to properly escape
   single quotes.
diff --git a/clang-tools-extra/test/clang-tidy/checkers/modernize/use-using.cpp b/clang-tools-extra/test/clang-tidy/checkers/modernize/use-using.cpp
index 14469e31c826249..01f22f26c034ebe 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/modernize/use-using.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/modernize/use-using.cpp
@@ -314,3 +314,10 @@ typedef struct { struct { int a; struct { struct { int b; } c; int d; } e; } f;
 typedef struct { struct { int a; } b; union { int c; float d; struct { int e; }; }; struct { double f; } g; } PR50990_siblings;
 // CHECK-MESSAGES: :[[@LINE-1]]:1: warning: use 'using' instead of 'typedef'
 // CHECK-FIXES: using PR50990_siblings = struct { struct { int a; } b; union { int c; float d; struct { int e; }; }; struct { double f; } g; };
+
+typedef void (*ISSUE_65055_1)(int);
+typedef bool (*ISSUE_65055_2)(int);
+// CHECK-MESSAGES: :[[@LINE-2]]:1: warning: use 'using' instead of 'typedef'
+// CHECK-MESSAGES: :[[@LINE-2]]:1: warning: use 'using' instead of 'typedef'
+// CHECK-FIXES: using ISSUE_65055_1 = void (*)(int)
+// CHECK-FIXES: using ISSUE_65055_2 = bool (*)(int)