[llvm-branch-commits] [clang-tools-extra] [clang-tidy] support to detect conversion in `make_optional` for `bugprone-optional-value-conversion` (PR #130417)

[Congcong Cai via llvm-branch-commits]

https://github.com/HerrCai0907 updated https://github.com/llvm/llvm-project/pull/130417

>From 1747df81cf0bf83838777a71ec577b083a66d85d Mon Sep 17 00:00:00 2001
From: Congcong Cai <congcongcai0907 at 163.com>
Date: Sat, 8 Mar 2025 21:50:19 +0800
Subject: [PATCH] [clang-tidy] support to detect conversion in `make_optional`
 for `bugprone-optional-value-conversion`

Fixes: #119554
---
 .../bugprone/OptionalValueConversionCheck.cpp      | 14 ++++++++++++++
 clang-tools-extra/docs/ReleaseNotes.rst            |  4 ++++
 ...ptional-value-conversion-construct-from-std.cpp | 13 +++++++++++++
 3 files changed, 31 insertions(+)

diff --git a/clang-tools-extra/clang-tidy/bugprone/OptionalValueConversionCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/OptionalValueConversionCheck.cpp
index 33e823ac07490..cb5a1c7bea801 100644
--- a/clang-tools-extra/clang-tidy/bugprone/OptionalValueConversionCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/OptionalValueConversionCheck.cpp
@@ -12,6 +12,7 @@
 #include "../utils/OptionsUtils.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
 #include <array>
 
 using namespace clang::ast_matchers;
@@ -31,6 +32,7 @@ constexpr std::array<StringRef, 2> MakeSmartPtrList{
     "::std::make_unique",
     "::std::make_shared",
 };
+constexpr StringRef MakeOptional = "::std::make_optional";
 
 } // namespace
 
@@ -86,6 +88,18 @@ void OptionalValueConversionCheck::registerMatchers(MatchFinder *Finder) {
                    callee(functionDecl(
                        matchers::matchesAnyListedName(MakeSmartPtrList),
                        hasTemplateArgument(0, refersToType(BindOptionalType)))),
+                   hasArgument(0, OptionalDerefMatcher)),
+               callExpr(
+                   // match first std::make_optional by limit argument count (1)
+                   // and template count (1).
+                   // 1. template< class T > constexpr
+                   //    std::optional<decay_t<T>> make_optional(T&& value);
+                   // 2. template< class T, class... Args > constexpr
+                   //    std::optional<T> make_optional(Args&&... args);
+                   argumentCountIs(1),
+                   callee(functionDecl(templateArgumentCountIs(1),
+                                       hasName(MakeOptional),
+                                       returns(BindOptionalType))),
                    hasArgument(0, OptionalDerefMatcher))),
            unless(anyOf(hasAncestor(typeLoc()),
                         hasAncestor(expr(matchers::hasUnevaluatedContext())))))
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index ce1418a2a7d58..a726015a708f7 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -115,6 +115,10 @@ Changes in existing checks
   no longer be needed and will be removed. Also fixing false positive from 
   const reference accessors to objects containing optional member.
 
+- Improved :doc:`bugprone-optional-value-conversion
+  <clang-tidy/checks/bugprone/optional-value-conversion>` check to detect
+  conversion in argument of ``std::make_optional``.
+
 - Improved :doc:`bugprone-unsafe-functions
   <clang-tidy/checks/bugprone/unsafe-functions>` check to allow specifying
   additional C++ member functions to match.
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/optional-value-conversion-construct-from-std.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone/optional-value-conversion-construct-from-std.cpp
index 768ab1ce014ce..305fd6890710d 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/bugprone/optional-value-conversion-construct-from-std.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/optional-value-conversion-construct-from-std.cpp
@@ -27,9 +27,19 @@ class unique_ptr {};
 template <typename type>
 class shared_ptr {};
 
+template <typename T>
+class initializer_list {};
+
 template <class T, class... Args> unique_ptr<T> make_unique(Args &&...args);
 template <class T, class... Args> shared_ptr<T> make_shared(Args &&...args);
 
+template <class T>
+constexpr std::optional<__decay(T)> make_optional(T &&value);
+template <class T, class... Args>
+constexpr std::optional<T> make_optional(Args &&...args);
+template <class T, class U, class... Args>
+constexpr std::optional<T> make_optional(std::initializer_list<U> il, Args &&...args);
+
 } // namespace std
 
 struct A {
@@ -45,9 +55,12 @@ void invalid() {
   // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: conversion from 'std::optional<int>' into 'int' and back into 'std::optional<int>', remove potentially error-prone optional dereference [bugprone-optional-value-conversion]
   std::make_shared<std::optional<int>>(opt.value());
   // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: conversion from 'std::optional<int>' into 'int' and back into 'std::optional<int>', remove potentially error-prone optional dereference [bugprone-optional-value-conversion]
+  std::make_optional(opt.value());
+  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: conversion from 'std::optional<int>' into 'int' and back into 'std::optional<int>', remove potentially error-prone optional dereference [bugprone-optional-value-conversion]
 }
 
 void valid() {
   std::make_unique<A>(opt.value());
   std::make_shared<A>(opt.value());
+  std::make_optional<int>(opt.value());
 }