[clang-tidy] Teach modernize-type-traits about more type traits
#147074
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@llvm/pr-subscribers-clang-tools-extra Author: Victor Chernyakin (localspook) ChangesThese new traits come from various standard versions: C++14:
C++17:
C++20:
C++23:
C++26:
This doesn't add Full diff: https://github.com/llvm/llvm-project/pull/147074.diff 2 Files Affected:
diff --git a/clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp b/clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp
index c0766395ec5cc..92e6f61a6d9d4 100644
--- a/clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp
@@ -28,8 +28,10 @@ static const llvm::StringSet<> ValueTraits = {
"is_array",
"is_assignable",
"is_base_of",
+ "is_bind_expression",
"is_bounded_array",
"is_class",
+ "is_clock",
"is_compound",
"is_const",
"is_constructible",
@@ -40,10 +42,14 @@ static const llvm::StringSet<> ValueTraits = {
"is_destructible",
"is_empty",
"is_enum",
+ "is_error_code_enum",
+ "is_error_condition_enum",
+ "is_execution_policy",
"is_final",
"is_floating_point",
"is_function",
"is_fundamental",
+ "is_implicit_lifetime",
"is_integral",
"is_invocable",
"is_invocable_r",
@@ -65,14 +71,17 @@ static const llvm::StringSet<> ValueTraits = {
"is_nothrow_invocable_r",
"is_nothrow_move_assignable",
"is_nothrow_move_constructible",
+ "is_nothrow_relocatable",
"is_nothrow_swappable",
"is_nothrow_swappable_with",
"is_null_pointer",
"is_object",
+ "is_placeholder",
"is_pointer",
"is_pointer_interconvertible_base_of",
"is_polymorphic",
"is_reference",
+ "is_replaceable",
"is_rvalue_reference",
"is_same",
"is_scalar",
@@ -91,15 +100,27 @@ static const llvm::StringSet<> ValueTraits = {
"is_trivially_destructible",
"is_trivially_move_assignable",
"is_trivially_move_constructible",
+ "is_trivially_relocatable",
"is_unbounded_array",
"is_union",
"is_unsigned",
+ "is_virtual_base_of",
"is_void",
"is_volatile",
"negation",
"rank",
+ "ratio_equal",
+ "ratio_greater_equal",
+ "ratio_greater",
+ "ratio_less_equal",
+ "ratio_less",
+ "ratio_not_equal",
"reference_constructs_from_temporary",
"reference_converts_from_temporary",
+ "treat_as_floating_point",
+ "tuple_size",
+ "uses_allocator",
+ "variant_size",
};
static const llvm::StringSet<> TypeTraits = {
@@ -130,6 +151,12 @@ static const llvm::StringSet<> TypeTraits = {
"result_of",
"invoke_result",
"type_identity",
+ "tuple_element",
+ "variant_alternative",
+ "compare_three_way_result",
+ "common_comparison_category",
+ "unwrap_ref_decay",
+ "unwrap_reference",
};
static DeclarationName getName(const DependentScopeDeclRefExpr &D) {
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index f8f183e9de1cc..3d554733ad3fd 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -276,6 +276,9 @@ Changes in existing checks
excluding variables with ``thread_local`` storage class specifier from being
matched.
+- Improved :doc:`modernize-type-traits
+ <clang-tidy/checks/modernize/type-traits>` check by detecting more type traits.
+
- Improved :doc:`modernize-use-default-member-init
<clang-tidy/checks/modernize/use-default-member-init>` check by matching
arithmetic operations, ``constexpr`` and ``static`` values, and detecting
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@llvm/pr-subscribers-clang-tidy Author: Victor Chernyakin (localspook) ChangesThese new traits come from various standard versions: C++14:
C++17:
C++20:
C++23:
C++26:
This doesn't add Full diff: https://github.com/llvm/llvm-project/pull/147074.diff 2 Files Affected:
diff --git a/clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp b/clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp
index c0766395ec5cc..92e6f61a6d9d4 100644
--- a/clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp
@@ -28,8 +28,10 @@ static const llvm::StringSet<> ValueTraits = {
"is_array",
"is_assignable",
"is_base_of",
+ "is_bind_expression",
"is_bounded_array",
"is_class",
+ "is_clock",
"is_compound",
"is_const",
"is_constructible",
@@ -40,10 +42,14 @@ static const llvm::StringSet<> ValueTraits = {
"is_destructible",
"is_empty",
"is_enum",
+ "is_error_code_enum",
+ "is_error_condition_enum",
+ "is_execution_policy",
"is_final",
"is_floating_point",
"is_function",
"is_fundamental",
+ "is_implicit_lifetime",
"is_integral",
"is_invocable",
"is_invocable_r",
@@ -65,14 +71,17 @@ static const llvm::StringSet<> ValueTraits = {
"is_nothrow_invocable_r",
"is_nothrow_move_assignable",
"is_nothrow_move_constructible",
+ "is_nothrow_relocatable",
"is_nothrow_swappable",
"is_nothrow_swappable_with",
"is_null_pointer",
"is_object",
+ "is_placeholder",
"is_pointer",
"is_pointer_interconvertible_base_of",
"is_polymorphic",
"is_reference",
+ "is_replaceable",
"is_rvalue_reference",
"is_same",
"is_scalar",
@@ -91,15 +100,27 @@ static const llvm::StringSet<> ValueTraits = {
"is_trivially_destructible",
"is_trivially_move_assignable",
"is_trivially_move_constructible",
+ "is_trivially_relocatable",
"is_unbounded_array",
"is_union",
"is_unsigned",
+ "is_virtual_base_of",
"is_void",
"is_volatile",
"negation",
"rank",
+ "ratio_equal",
+ "ratio_greater_equal",
+ "ratio_greater",
+ "ratio_less_equal",
+ "ratio_less",
+ "ratio_not_equal",
"reference_constructs_from_temporary",
"reference_converts_from_temporary",
+ "treat_as_floating_point",
+ "tuple_size",
+ "uses_allocator",
+ "variant_size",
};
static const llvm::StringSet<> TypeTraits = {
@@ -130,6 +151,12 @@ static const llvm::StringSet<> TypeTraits = {
"result_of",
"invoke_result",
"type_identity",
+ "tuple_element",
+ "variant_alternative",
+ "compare_three_way_result",
+ "common_comparison_category",
+ "unwrap_ref_decay",
+ "unwrap_reference",
};
static DeclarationName getName(const DependentScopeDeclRefExpr &D) {
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index f8f183e9de1cc..3d554733ad3fd 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -276,6 +276,9 @@ Changes in existing checks
excluding variables with ``thread_local`` storage class specifier from being
matched.
+- Improved :doc:`modernize-type-traits
+ <clang-tidy/checks/modernize/type-traits>` check by detecting more type traits.
+
- Improved :doc:`modernize-use-default-member-init
<clang-tidy/checks/modernize/use-default-member-init>` check by matching
arithmetic operations, ``constexpr`` and ``static`` values, and detecting
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EugeneZelenko
requested review from
PiotrZSL,
Copilot,
vbvictor,
carlosgalvezp,
5chmidti and
HerrCai0907
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Pull Request Overview
Adds support for more C++ type traits in the modernize-type-traits clang-tidy check and updates the release notes accordingly.
- Expanded
ValueTraitsandTypeTraitsstring sets inTypeTraitsCheck.cppwith new traits from C++14 through C++26. - Updated
ReleaseNotes.rstto document enhanced detection in themodernize-type-traitscheck.
Reviewed Changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| clang-tools-extra/docs/ReleaseNotes.rst | Added a bullet to announce improved trait detection in the modernize-type-traits check |
| clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp | Inserted numerous new trait names into ValueTraits and TypeTraits sets |
Comments suppressed due to low confidence (2)
clang-tools-extra/docs/ReleaseNotes.rst:279
- [nitpick] The bullet link is split across two lines which may break RST formatting; consider combining the link and description on one line or properly indenting the continuation to match list formatting.
- Improved :doc:`modernize-type-traits
clang-tools-extra/clang-tidy/modernize/TypeTraitsCheck.cpp:152
- This line uses a tab for indentation; please replace it with spaces to match the surrounding entries and project style.
"tuple_element",
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I wonder did you find this somehow automatically or manually? |
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Mostly manually: I took a list of all standard library symbols, used a hacky regex to find |
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I've changed the tests to use |
clang-tools-extra/docs/clang-tidy/checks/modernize/type-traits.rst
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When we're ready to merge, someone please do it for me, I don't have write permissions. |
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@localspook Congratulations on having your first Pull Request (PR) merged into the LLVM Project! Your changes will be combined with recent changes from other authors, then tested by our build bots. If there is a problem with a build, you may receive a report in an email or a comment on this PR. Please check whether problems have been caused by your change specifically, as the builds can include changes from many authors. It is not uncommon for your change to be included in a build that fails due to someone else's changes, or infrastructure issues. How to do this, and the rest of the post-merge process, is covered in detail here. If your change does cause a problem, it may be reverted, or you can revert it yourself. This is a normal part of LLVM development. You can fix your changes and open a new PR to merge them again. If you don't get any reports, no action is required from you. Your changes are working as expected, well done! |
These new traits come from various standard versions:
C++14:
tuple_element_tC++17:
is_placeholder_vis_bind_expression_vratio_equal_vratio_not_equal_vratio_less_vratio_less_equal_vratio_greater_vratio_greater_equal_vis_error_code_enum_vis_error_condition_enum_vis_execution_policy_vtuple_size_vvariant_size_vuses_allocator_vvariant_alternative_tC++20:
compare_three_way_result_tcommon_comparison_category_tunwrap_ref_decay_tunwrap_reference_tC++23:
is_implicit_lifetime_vC++26:
is_nothrow_relocatable_vis_replaceable_vis_trivially_relocatable_vis_virtual_base_of_vThis doesn't add
treat_as_floating_point_voris_clock_vbecause they require more invasive changes; instead I've opened #147072 to track them.