https://github.com/felix642 created
https://github.com/llvm/llvm-project/pull/82947
The check needs a parent decl to match but if the typedef is in a function, the
parent is a declStmt which is not a decl by itself. Improved the matcher to
match on either a decl or a declstmt and extract the decl from the stmt in the
latter case.
fixes #72179
CC: @FabianWolff @PiotrZSL @njames93
From 003ec9d5b75cdf6de3140612e1c4b42322a52413 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?F=C3=A9lix-Antoine=20Constantin?=
<felix-antoine.constan...@polymtl.ca>
Date: Sun, 25 Feb 2024 20:20:59 -0500
Subject: [PATCH] [clang-tidy] Improved modernize-use-using by fixing a
false-positive
The check needs a parent decl to match but if the typedef is in a function,
the parent is a declStmt which is not a decl by itself.
Improved the matcher to match on either a decl or a declstmt and extract
the decl from the stmt in the latter case.
fixes #72179
---
.../clang-tidy/modernize/UseUsingCheck.cpp | 16 +++++++++++++---
clang-tools-extra/docs/ReleaseNotes.rst | 3 +++
.../checkers/modernize/use-using.cpp | 18 ++++++++++++++++++
3 files changed, 34 insertions(+), 3 deletions(-)
diff --git a/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
b/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
index bb05f206c717ce..50a07fc02e31b4 100644
--- a/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
@@ -24,6 +24,7 @@ static constexpr llvm::StringLiteral ExternCDeclName =
"extern-c-decl";
static constexpr llvm::StringLiteral ParentDeclName = "parent-decl";
static constexpr llvm::StringLiteral TagDeclName = "tag-decl";
static constexpr llvm::StringLiteral TypedefName = "typedef";
+static constexpr llvm::StringLiteral DeclStmtName = "decl-stmt";
UseUsingCheck::UseUsingCheck(StringRef Name, ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
@@ -41,7 +42,8 @@ void UseUsingCheck::registerMatchers(MatchFinder *Finder) {
unless(isInstantiated()),
optionally(hasAncestor(
linkageSpecDecl(isExternCLinkage()).bind(ExternCDeclName))),
- hasParent(decl().bind(ParentDeclName)))
+ anyOf(hasParent(decl().bind(ParentDeclName)),
+ hasParent(declStmt().bind(DeclStmtName))))
.bind(TypedefName),
this);
@@ -51,17 +53,25 @@ void UseUsingCheck::registerMatchers(MatchFinder *Finder) {
tagDecl(
anyOf(allOf(unless(anyOf(isImplicit(),
classTemplateSpecializationDecl())),
- hasParent(decl().bind(ParentDeclName))),
+ anyOf(hasParent(decl().bind(ParentDeclName)),
+ hasParent(declStmt().bind(DeclStmtName)))),
// We want the parent of the ClassTemplateDecl, not the parent
// of the specialization.
classTemplateSpecializationDecl(hasAncestor(classTemplateDecl(
- hasParent(decl().bind(ParentDeclName)))))))
+ anyOf(hasParent(decl().bind(ParentDeclName)),
+ hasParent(declStmt().bind(DeclStmtName))))))))
.bind(TagDeclName),
this);
}
void UseUsingCheck::check(const MatchFinder::MatchResult &Result) {
const auto *ParentDecl = Result.Nodes.getNodeAs<Decl>(ParentDeclName);
+
+ if (!ParentDecl) {
+ const auto *ParentDeclStmt =
Result.Nodes.getNodeAs<DeclStmt>(DeclStmtName);
+ ParentDecl = ParentDeclStmt->getSingleDecl();
+ }
+
if (!ParentDecl)
return;
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst
b/clang-tools-extra/docs/ReleaseNotes.rst
index 6fd01ed9d471c5..2b36ae4acb9f1d 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -183,6 +183,9 @@ Changes in existing checks
<clang-tidy/checks/modernize/use-override>` check to also remove any trailing
whitespace when deleting the ``virtual`` keyword.
+- Improved :doc:`modernize-use-using <clang-tidy/checks/modernize/use-using>`
+ check by fixing false-negative in functions.
+
- Improved :doc:`readability-implicit-bool-conversion
<clang-tidy/checks/readability/implicit-bool-conversion>` check to provide
valid fix suggestions for ``static_cast`` without a preceding space and
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 462bc984fd3ad5..230c7c94cda1cf 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
@@ -342,3 +342,21 @@ typedef int InExternCPP;
// CHECK-FIXES: using InExternCPP = int;
}
+
+namespace ISSUE_72179
+{
+ void foo()
+ {
+ typedef int a;
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use 'using' instead of
'typedef' [modernize-use-using]
+ // CHECK-FIXES: using a = int;
+
+ }
+
+ void foo2()
+ {
+ typedef struct { int a; union { int b; }; } c;
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use 'using' instead of
'typedef' [modernize-use-using]
+ // CHECK-FIXES: using c = struct { int a; union { int b; }; };
+ }
+}
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