https://github.com/HerrCai0907 created
https://github.com/llvm/llvm-project/pull/113639
Fixed #111013
bool will be builtin type in C23 but comparison result in C is still int.
It is no need to change this kind of implicit cast to explicit cast.
>From 53ff1325281e37b164abc8705f2d75d7caeec3a4 Mon Sep 17 00:00:00 2001
From: Congcong Cai <congcongcai0...@163.com>
Date: Fri, 25 Oct 2024 11:07:14 +0800
Subject: [PATCH] [clang-tidy] fix false positive for implicit conversion of
comparison result in C23
Fixed #111013
bool will be builtin type in C23 but comparison result in C is still int.
It is no need to change this kind of implicit cast to explicit cast.
---
.../readability/ImplicitBoolConversionCheck.cpp | 7 +++++++
clang-tools-extra/docs/ReleaseNotes.rst | 3 ++-
.../checkers/readability/implicit-bool-conversion.c | 9 +++++++++
3 files changed, 18 insertions(+), 1 deletion(-)
diff --git
a/clang-tools-extra/clang-tidy/readability/ImplicitBoolConversionCheck.cpp
b/clang-tools-extra/clang-tidy/readability/ImplicitBoolConversionCheck.cpp
index 968a4a55a6d798..06415c1346a4f0 100644
--- a/clang-tools-extra/clang-tidy/readability/ImplicitBoolConversionCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/ImplicitBoolConversionCheck.cpp
@@ -26,6 +26,8 @@ AST_MATCHER(Stmt, isMacroExpansion) {
return SM.isMacroBodyExpansion(Loc) || SM.isMacroArgExpansion(Loc);
}
+AST_MATCHER(Stmt, isC23) { return Finder->getASTContext().getLangOpts().C23; }
+
bool isNULLMacroExpansion(const Stmt *Statement, ASTContext &Context) {
SourceManager &SM = Context.getSourceManager();
const LangOptions &LO = Context.getLangOpts();
@@ -298,6 +300,11 @@ void
ImplicitBoolConversionCheck::registerMatchers(MatchFinder *Finder) {
hasCastKind(CK_FloatingToBoolean),
hasCastKind(CK_PointerToBoolean),
hasCastKind(CK_MemberPointerToBoolean)),
+ // Exclude cases of C23 comparison result.
+ unless(allOf(
+ isC23(),
+ hasSourceExpression(binaryOperator(hasAnyOperatorName(
+ ">", ">=", "==", "!=", "<", "<="))))),
// Exclude case of using if or while statements with
variable
// declaration, e.g.:
// if (int var = functionCall()) {}
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst
b/clang-tools-extra/docs/ReleaseNotes.rst
index a9b1ab367f538a..e42082806fd308 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -244,7 +244,8 @@ Changes in existing checks
- Improved :doc:`readability-implicit-bool-conversion
<clang-tidy/checks/readability/implicit-bool-conversion>` check
by adding the option `UseUpperCaseLiteralSuffix` to select the
- case of the literal suffix in fixes.
+ case of the literal suffix in fixes and fixing false positive for implicit
+ conversion of comparison result in C23.
- Improved :doc:`readability-redundant-smartptr-get
<clang-tidy/checks/readability/redundant-smartptr-get>` check to
diff --git
a/clang-tools-extra/test/clang-tidy/checkers/readability/implicit-bool-conversion.c
b/clang-tools-extra/test/clang-tidy/checkers/readability/implicit-bool-conversion.c
index f3dc32c10d640a..0b231d10adf8fc 100644
---
a/clang-tools-extra/test/clang-tidy/checkers/readability/implicit-bool-conversion.c
+++
b/clang-tools-extra/test/clang-tidy/checkers/readability/implicit-bool-conversion.c
@@ -304,6 +304,15 @@ void
implicitConversionToBoolFromUnaryMinusAndZeroLiterals() {
// CHECK-FIXES: functionTakingBool((-0.0) != 0.0);
}
+void ignoreImplicitCastToBoolForComparisonResult() {
+ bool boolFromComparison0 = 1 != 0;
+ bool boolFromComparison1 = 1 == 0;
+ bool boolFromComparison2 = 1 > 0;
+ bool boolFromComparison3 = 1 >= 0;
+ bool boolFromComparison4 = 1 < 0;
+ bool boolFromComparison5 = 1 <= 0;
+}
+
void ignoreExplicitCastsToBool() {
int integer = 10;
bool boolComingFromInt = (bool)integer;
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