[clang-tools-extra] [clang-tidy] Improve modernize-make-shared check (PR #70600)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL created https://github.com/llvm/llvm-project/pull/70600

Improved modernize-make-shared check to support
std::shared_ptr implementations that inherit the
reset method from a base class.
In GCC that class is called __shared_ptr.

Fixes #64481

>From 79c01dbf330cd3489ee8ac1dd284c80eacebce85 Mon Sep 17 00:00:00 2001
From: Piotr Zegar <me at piotrzegar.pl>
Date: Sun, 29 Oct 2023 19:21:23 +0000
Subject: [PATCH] [clang-tidy] Improve modernize-make-shared check

Improved modernize-make-shared check to support
std::shared_ptr implementations that inherit the
reset method from a base class.
In GCC that class is called __shared_ptr.
---
 .../modernize/MakeSmartPtrCheck.cpp           | 20 ++++++++------
 clang-tools-extra/docs/ReleaseNotes.rst       |  5 ++++
 .../modernize/Inputs/smart-ptr/shared_ptr.h   | 27 ++++++++++++-------
 3 files changed, 35 insertions(+), 17 deletions(-)

diff --git a/clang-tools-extra/clang-tidy/modernize/MakeSmartPtrCheck.cpp b/clang-tools-extra/clang-tidy/modernize/MakeSmartPtrCheck.cpp
index 2f9f47d3f6c3e85..71fd8eca300c1b2 100644
--- a/clang-tools-extra/clang-tidy/modernize/MakeSmartPtrCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/MakeSmartPtrCheck.cpp
@@ -96,14 +96,18 @@ void MakeSmartPtrCheck::registerMatchers(ast_matchers::MatchFinder *Finder) {
       this);
 
   Finder->addMatcher(
-      traverse(TK_AsIs,
-               cxxMemberCallExpr(
-                   thisPointerType(getSmartPointerTypeMatcher()),
-                   callee(cxxMethodDecl(hasName("reset"))),
-                   hasArgument(0, cxxNewExpr(CanCallCtor, unless(IsPlacement))
-                                      .bind(NewExpression)),
-                   unless(isInTemplateInstantiation()))
-                   .bind(ResetCall)),
+      traverse(
+          TK_AsIs,
+          cxxMemberCallExpr(
+              unless(isInTemplateInstantiation()),
+              hasArgument(0, cxxNewExpr(CanCallCtor, unless(IsPlacement))
+                                 .bind(NewExpression)),
+              callee(cxxMethodDecl(hasName("reset"))),
+              anyOf(thisPointerType(getSmartPointerTypeMatcher()),
+                    on(ignoringImplicit(anyOf(
+                        hasType(getSmartPointerTypeMatcher()),
+                        hasType(pointsTo(getSmartPointerTypeMatcher())))))))
+              .bind(ResetCall)),
       this);
 }
 
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index 5ce38ab48bf295f..2a755e9b75aa739 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -331,6 +331,11 @@ Changes in existing checks
   iterators initialized by free functions like ``begin``, ``end``, or ``size``
   and avoid crash for array of dependent array.
 
+- Improved :doc:`modernize-make-shared
+  <clang-tidy/checks/modernize/make-shared>` check to support
+  ``std::shared_ptr`` implementations that inherit the ``reset`` method from a
+  base class.
+
 - Improved :doc:`modernize-return-braced-init-list
   <clang-tidy/checks/modernize/return-braced-init-list>` check to ignore
   false-positives when constructing the container with ``count`` copies of
diff --git a/clang-tools-extra/test/clang-tidy/checkers/modernize/Inputs/smart-ptr/shared_ptr.h b/clang-tools-extra/test/clang-tidy/checkers/modernize/Inputs/smart-ptr/shared_ptr.h
index 0f4f2a97095b56f..337cb28228b09c4 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/modernize/Inputs/smart-ptr/shared_ptr.h
+++ b/clang-tools-extra/test/clang-tidy/checkers/modernize/Inputs/smart-ptr/shared_ptr.h
@@ -1,24 +1,33 @@
 namespace std {
 
 template <typename type>
-class shared_ptr {
+class __shared_ptr {
+protected:
+  __shared_ptr();
+  __shared_ptr(type *ptr);
+  ~__shared_ptr();
 public:
-  shared_ptr();
-  shared_ptr(type *ptr);
-  shared_ptr(const shared_ptr<type> &t) {}
-  shared_ptr(shared_ptr<type> &&t) {}
-  ~shared_ptr();
   type &operator*() { return *ptr; }
   type *operator->() { return ptr; }
   type *release();
   void reset();
   void reset(type *pt);
-  shared_ptr &operator=(shared_ptr &&);
-  template <typename T>
-  shared_ptr &operator=(shared_ptr<T> &&);
 
 private:
   type *ptr;
 };
 
+template <typename type>
+class shared_ptr : public __shared_ptr<type> {
+public:
+  shared_ptr();
+  shared_ptr(type *ptr);
+  shared_ptr(const shared_ptr<type> &t);
+  shared_ptr(shared_ptr<type> &&t);
+  ~shared_ptr();
+  shared_ptr &operator=(shared_ptr &&);
+  template <typename T>
+  shared_ptr &operator=(shared_ptr<T> &&);
+};
+
 }  // namespace std