.clang-tidy

# `maybe-*` checks are only available on OneFlow custom clang-tidy and clangd
# `-allow-enabling-analyzer-alpha-checkers` should be passed to clang-tidy for CSA checkers named `clang-analyzer-alpha.*` (or `-allow-enabling-alpha-checkers` for run-clang-tidy.py)
# `aggressive-binary-operation-simplification` should be enabled (via `-Xclang -analyzer-config -Xclang aggressive-binary-operation-simplification=true` in clang)
# there is some problem in `clang-analyzer-alpha.clone.*`, so do not enable it
# `clang-analyzer-alpha.deadcode.*` is just too verbose to enable
Checks: >-
  -*,
  clang-diagnostic-*,
  maybe-*,
  clang-analyzer-core.*,
  clang-analyzer-cplusplus.*,
  clang-analyzer-nullability.*,
  clang-analyzer-deadcode.*,
  clang-analyzer-security.*,
  clang-analyzer-optin.cplusplus.*,
  clang-analyzer-optin.performance.*,
  clang-analyzer-alpha.core.*,
  clang-analyzer-alpha.cplusplus.*,
  clang-analyzer-alpha.security.*,
  cppcoreguidelines-avoid-goto,
  cppcoreguidelines-init-variables,
  cppcoreguidelines-interfaces-global-init,
  cppcoreguidelines-no-malloc,
  cppcoreguidelines-prefer-member-initializer,
  cppcoreguidelines-pro-type-member-init,
  cppcoreguidelines-pro-type-static-cast-downcast,
  cppcoreguidelines-slicing,
  cppcoreguidelines-special-member-functions,
  performance-unnecessary-value-param,
  performance-unnecessary-copy-initialization,
  performance-noexcept-move-constructor,
  performance-no-automatic-move,
  performance-move-const-arg,
  performance-implicit-conversion-in-loop,
  performance-for-range-copy,
  google-default-arguments,
  google-global-names-in-headers,
  google-explicit-constructor,
  modernize-use-emplace

# TODO: treat all maybe warnings as errors when existing warnings are all fixed
# `clang-analyzer-cplusplus.NewDelete` cannot model reference counting properly for ObjectMsg
WarningsAsErrors: >-
  maybe-unused,
  clang-analyzer-nullability.*,
  clang-analyzer-cplusplus.*,
  performance-implicit-conversion-in-loop,
  performance-move-const-arg,
  performance-no-automatic-move,
  performance-noexcept-move-constructor,
  google-default-arguments,
  google-global-names-in-headers,
  -clang-analyzer-cplusplus.NewDelete,
  modernize-use-emplace

CheckOptions:
  # `cppcoreguidelines-special-member-functions` is enabled, refer to https://en.cppreference.com/w/cpp/language/rule_of_three
  - key:             cppcoreguidelines-special-member-functions.AllowSoleDefaultDtor
    value:           True
  - key:             performance-move-const-arg.CheckTriviallyCopyableMove
    value:           False
  - key:             cppcoreguidelines-special-member-functions.AllowMissingMoveFunctionsWhenCopyIsDeleted
    value:           True