PiotrZSL created this revision.
PiotrZSL added reviewers: njames93, carlosgalvezp, Izaron, fwolff.
Herald added a subscriber: xazax.hun.
Herald added a project: All.
PiotrZSL requested review of this revision.
Herald added a project: clang-tools-extra.
Herald added a subscriber: cfe-commits.
Fixed issue with the comparison of UnaryExprOrTypeTraitExpr
objects in which only the argument type was checked, without
considering the kind of expression. This led to false positives when
using sizeof(x) and alignof(x) expressions, as only the
comparison x = x was performed without checking if sizeof
was equal to alignof.
Fixes: https://github.com/llvm/llvm-project/issues/63096
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D152713
Files:
clang-tools-extra/clang-tidy/misc/RedundantExpressionCheck.cpp
clang-tools-extra/docs/ReleaseNotes.rst
clang-tools-extra/test/clang-tidy/checkers/misc/redundant-expression.cpp
Index: clang-tools-extra/test/clang-tidy/checkers/misc/redundant-expression.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/misc/redundant-expression.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/misc/redundant-expression.cpp
@@ -843,3 +843,15 @@
return 2;
}
+
+namespace PR63096 {
+
+struct alignas(sizeof(int)) X {
+ int x;
+};
+
+static_assert(alignof(X) == sizeof(X));
+static_assert(sizeof(X) == sizeof(X));
+// CHECK-MESSAGES: :[[@LINE-1]]:25: warning: both sides of operator are
equivalent
+
+}
Index: clang-tools-extra/docs/ReleaseNotes.rst
===================================================================
--- clang-tools-extra/docs/ReleaseNotes.rst
+++ clang-tools-extra/docs/ReleaseNotes.rst
@@ -306,6 +306,10 @@
<clang-tidy/checks/misc/definitions-in-headers>` to avoid warning on
declarations inside anonymous namespaces.
+- Fixed false-positive in :doc:`misc-redundant-expression
+ <clang-tidy/checks/misc/redundant-expression>` check where expressions like
+ ``alignof`` or ``sizeof`` were incorrectly flagged as identical.
+
- Improved :doc:`misc-unused-parameters
<clang-tidy/checks/misc/unused-parameters>` check with new `IgnoreVirtual`
option to optionally ignore virtual methods.
Index: clang-tools-extra/clang-tidy/misc/RedundantExpressionCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/misc/RedundantExpressionCheck.cpp
+++ clang-tools-extra/clang-tidy/misc/RedundantExpressionCheck.cpp
@@ -144,8 +144,9 @@
const auto *RightUnaryExpr =
cast<UnaryExprOrTypeTraitExpr>(Right);
if (LeftUnaryExpr->isArgumentType() && RightUnaryExpr->isArgumentType())
- return LeftUnaryExpr->getArgumentType() ==
- RightUnaryExpr->getArgumentType();
+ return LeftUnaryExpr->getKind() == RightUnaryExpr->getKind() &&
+ LeftUnaryExpr->getArgumentType() ==
+ RightUnaryExpr->getArgumentType();
if (!LeftUnaryExpr->isArgumentType() && !RightUnaryExpr->isArgumentType())
return areEquivalentExpr(LeftUnaryExpr->getArgumentExpr(),
RightUnaryExpr->getArgumentExpr());
Index: clang-tools-extra/test/clang-tidy/checkers/misc/redundant-expression.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/misc/redundant-expression.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/misc/redundant-expression.cpp
@@ -843,3 +843,15 @@
return 2;
}
+
+namespace PR63096 {
+
+struct alignas(sizeof(int)) X {
+ int x;
+};
+
+static_assert(alignof(X) == sizeof(X));
+static_assert(sizeof(X) == sizeof(X));
+// CHECK-MESSAGES: :[[@LINE-1]]:25: warning: both sides of operator are equivalent
+
+}
Index: clang-tools-extra/docs/ReleaseNotes.rst
===================================================================
--- clang-tools-extra/docs/ReleaseNotes.rst
+++ clang-tools-extra/docs/ReleaseNotes.rst
@@ -306,6 +306,10 @@
<clang-tidy/checks/misc/definitions-in-headers>` to avoid warning on
declarations inside anonymous namespaces.
+- Fixed false-positive in :doc:`misc-redundant-expression
+ <clang-tidy/checks/misc/redundant-expression>` check where expressions like
+ ``alignof`` or ``sizeof`` were incorrectly flagged as identical.
+
- Improved :doc:`misc-unused-parameters
<clang-tidy/checks/misc/unused-parameters>` check with new `IgnoreVirtual`
option to optionally ignore virtual methods.
Index: clang-tools-extra/clang-tidy/misc/RedundantExpressionCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/misc/RedundantExpressionCheck.cpp
+++ clang-tools-extra/clang-tidy/misc/RedundantExpressionCheck.cpp
@@ -144,8 +144,9 @@
const auto *RightUnaryExpr =
cast<UnaryExprOrTypeTraitExpr>(Right);
if (LeftUnaryExpr->isArgumentType() && RightUnaryExpr->isArgumentType())
- return LeftUnaryExpr->getArgumentType() ==
- RightUnaryExpr->getArgumentType();
+ return LeftUnaryExpr->getKind() == RightUnaryExpr->getKind() &&
+ LeftUnaryExpr->getArgumentType() ==
+ RightUnaryExpr->getArgumentType();
if (!LeftUnaryExpr->isArgumentType() && !RightUnaryExpr->isArgumentType())
return areEquivalentExpr(LeftUnaryExpr->getArgumentExpr(),
RightUnaryExpr->getArgumentExpr());
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