https://github.com/felix642 updated
https://github.com/llvm/llvm-project/pull/82947
From e67122cb2c17395e863725cc25d99afe6c7bb48c 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-negative
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 | 24 +++++++++--
clang-tools-extra/docs/ReleaseNotes.rst | 3 ++
.../checkers/modernize/use-using.cpp | 43 ++++++++++++++++++-
3 files changed, 66 insertions(+), 4 deletions(-)
diff --git a/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
b/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
index bb05f206c717cea..24eefdb082eb32a 100644
--- a/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
@@ -8,6 +8,7 @@
#include "UseUsingCheck.h"
#include "clang/AST/ASTContext.h"
+#include "clang/AST/DeclGroup.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
@@ -24,6 +25,7 @@ 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 +43,8 @@ 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 +54,32 @@ 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);
+ if (ParentDeclStmt) {
+ if (ParentDeclStmt->isSingleDecl())
+ ParentDecl = ParentDeclStmt->getSingleDecl();
+ else
+ ParentDecl =
+ ParentDeclStmt->getDeclGroup().getDeclGroup()
+ [ParentDeclStmt->getDeclGroup().getDeclGroup().size() - 1];
+ }
+ }
+
if (!ParentDecl)
return;
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst
b/clang-tools-extra/docs/ReleaseNotes.rst
index 44680f79de6f543..7e4c75b5c3a2948 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -224,6 +224,9 @@ Changes in existing checks
analyzed, se the check now handles the common patterns
`const auto e = (*vector_ptr)[i]` and `const auto e = vector_ptr->at(i);`.
+- Improved :doc:`modernize-use-using <clang-tidy/checks/modernize/use-using>`
+ check by adding support for detection of typedefs declared on function level.
+
- 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 462bc984fd3ad56..925e5f9c1ca54e8 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
@@ -1,4 +1,4 @@
-// RUN: %check_clang_tidy %s modernize-use-using %t -- -- -I
%S/Inputs/use-using/
+// RUN: %check_clang_tidy %s modernize-use-using %t -- --
-fno-delayed-template-parsing -I %S/Inputs/use-using/
typedef int Type;
// CHECK-MESSAGES: :[[@LINE-1]]:1: warning: use 'using' instead of 'typedef'
[modernize-use-using]
@@ -342,3 +342,44 @@ 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; }; };
+ }
+
+ template <typename T>
+ void foo3()
+ {
+ typedef T b;
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use 'using' instead of
'typedef' [modernize-use-using]
+ // CHECK-FIXES: using b = T;
+ }
+
+ template <typename T>
+ class MyClass
+ {
+ void foo()
+ {
+ typedef MyClass c;
+ // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: use 'using' instead of
'typedef' [modernize-use-using]
+ // CHECK-FIXES: using c = MyClass;
+ }
+ };
+
+ const auto foo4 = [](int a){typedef int d;};
+ // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: use 'using' instead of
'typedef' [modernize-use-using]
+ // CHECK-FIXES: const auto foo4 = [](int a){using d = int;};
+}
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