[PATCH] D52670: [clang-tidy] Add new 'readability-uppercase-literal-suffix' check (CERT DCL16-C, MISRA C:2012, 7.3, MISRA C++:2008, 2-13-4)

[Roman Lebedev via Phabricator via cfe-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: JonasToth, aaron.ballman, alexfh, hokein, xazax.hun.
lebedev.ri added a project: clang-tools-extra.
Herald added subscribers: rnkovacs, mgorny.

Detects when the integral literal or floating point (decimal or hexadecimal)
literal has non-uppercase suffix, and suggests to make the suffix uppercase,
with fix-it.

All valid combinations of suffixes are supported.

  auto x = 1;  // OK, no suffix.
  
  auto x = 1u; // warning: integer literal suffix 'u' is not upper-case
  
  auto x = 1U; // OK, suffix is uppercase.
  
  ...

References:

- CERT DCL16-C <https://wiki.sei.cmu.edu/confluence/pages/viewpage.action?pageId=87152241>
- MISRA C:2012, 7.3 - The lowercase character "l" shall not be used in a literal suffix
- MISRA C++:2008, 2-13-4 - Literal suffixes shall be upper case


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D52670

Files:
  clang-tidy/cert/CERTTidyModule.cpp
  clang-tidy/cert/CMakeLists.txt
  clang-tidy/readability/CMakeLists.txt
  clang-tidy/readability/MagicNumbersCheck.cpp
  clang-tidy/readability/MagicNumbersCheck.h
  clang-tidy/readability/ReadabilityTidyModule.cpp
  clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp
  clang-tidy/readability/UppercaseLiteralSuffixCheck.h
  clang-tidy/utils/ASTUtils.cpp
  clang-tidy/utils/ASTUtils.h
  docs/ReleaseNotes.rst
  docs/clang-tidy/checks/list.rst
  docs/clang-tidy/checks/readability-uppercase-literal-suffix.rst
  test/clang-tidy/readability-uppercase-literal-suffix-floating-point.cpp
  test/clang-tidy/readability-uppercase-literal-suffix-hexadecimal-floating-point.cpp
  test/clang-tidy/readability-uppercase-literal-suffix-integer.cpp

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