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[clang-tidy] Teach readability-uppercase-literal-suffix about C++23 and C23 suffixes #148275

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[clang-tidy] Teach readability-uppercase-literal-suffix about C++23 and C23 suffixes #148275

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13 changes: 7 additions & 6 deletions clang-tools-extra/clang-tidy/readability/UppercaseLiteralSuffixCheck.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -25,10 +25,11 @@ struct IntegerLiteralCheck {
static constexpr llvm::StringLiteral Name = llvm::StringLiteral("integer");
// What should be skipped before looking for the Suffixes? (Nothing here.)
static constexpr llvm::StringLiteral SkipFirst = llvm::StringLiteral("");
// Suffix can only consist of 'u' and 'l' chars, and can be a complex number
// ('i', 'j'). In MS compatibility mode, suffixes like i32 are supported.
// Suffix can only consist of 'u', 'l', and 'z' chars, can be a bit-precise
// integer (wb), and can be a complex number ('i', 'j'). In MS compatibility
// mode, suffixes like i32 are supported.
static constexpr llvm::StringLiteral Suffixes =
llvm::StringLiteral("uUlLiIjJ");
llvm::StringLiteral("uUlLzZwWbBiIjJ");
};
constexpr llvm::StringLiteral IntegerLiteralCheck::Name;
constexpr llvm::StringLiteral IntegerLiteralCheck::SkipFirst;
Expand All @@ -45,10 +46,10 @@ struct FloatingLiteralCheck {
// Since the exponent ('p'/'P') is mandatory for hexadecimal floating-point
// literals, we first skip everything before the exponent.
static constexpr llvm::StringLiteral SkipFirst = llvm::StringLiteral("pP");
// Suffix can only consist of 'f', 'l', "f16", 'h', 'q' chars,
// and can be a complex number ('i', 'j').
// Suffix can only consist of 'f', 'l', "f16", "bf16", "df", "dd", "dl",
// 'h', 'q' chars, and can be a complex number ('i', 'j').
static constexpr llvm::StringLiteral Suffixes =
llvm::StringLiteral("fFlLhHqQiIjJ");
llvm::StringLiteral("fFlLbBdDhHqQiIjJ");
};
constexpr llvm::StringLiteral FloatingLiteralCheck::Name;
constexpr llvm::StringLiteral FloatingLiteralCheck::SkipFirst;
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4 changes: 4 additions & 0 deletions clang-tools-extra/docs/ReleaseNotes.rst
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Expand Up @@ -354,6 +354,10 @@ Changes in existing checks
<clang-tidy/checks/readability/redundant-smartptr-get>` check by fixing
some false positives involving smart pointers to arrays.

- Improved :doc:`readability-uppercase-literal-suffix
<clang-tidy/checks/readability/uppercase-literal-suffix>` check to recognize
literal suffixes added in C++23 and C23.

Removed checks
^^^^^^^^^^^^^^

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162 changes: 162 additions & 0 deletions clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-c23.c
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@@ -0,0 +1,162 @@
// TODO: When Clang adds support for decimal floating point types, enable these tests by:
// 1. Removing all the #if 0 + #endif guards.
// 2. Removing all occurrences of the string "DISABLED-" in this file.
// 3. Deleting this message.

// RUN: %check_clang_tidy %s readability-uppercase-literal-suffix %t -- -- -std=c23
// RUN: grep -Ev "// *[A-Z-]+:" %s > %t.c
// RUN: clang-tidy %t.c -checks='-*,readability-uppercase-literal-suffix' -fix -- -std=c23
// RUN: clang-tidy %t.c -checks='-*,readability-uppercase-literal-suffix' -warnings-as-errors='-*,readability-uppercase-literal-suffix' -- -std=c23

void bit_precise_literal_suffix() {
// _BitInt()

static constexpr auto v1 = 1wb;
// CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'wb', which is not uppercase
// CHECK-MESSAGES-NEXT: static constexpr auto v1 = 1wb;
// CHECK-MESSAGES-NEXT: ^~~
// CHECK-MESSAGES-NEXT: WB{{$}}
// CHECK-FIXES: static constexpr auto v1 = 1WB;
static_assert(v1 == 1WB);

static constexpr auto v2 = 1WB; // OK.
static_assert(v2 == 1WB);

// _BitInt() Unsigned

static constexpr auto v3 = 1wbu;
// CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'wbu', which is not uppercase
// CHECK-MESSAGES-NEXT: static constexpr auto v3 = 1wbu;
// CHECK-MESSAGES-NEXT: ^~~~
// CHECK-MESSAGES-NEXT: WBU{{$}}
// CHECK-FIXES: static constexpr auto v3 = 1WBU;
static_assert(v3 == 1WBU);

static constexpr auto v4 = 1WBu;
// CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'WBu', which is not uppercase
// CHECK-MESSAGES-NEXT: static constexpr auto v4 = 1WBu;
// CHECK-MESSAGES-NEXT: ^~~~
// CHECK-MESSAGES-NEXT: WBU{{$}}
// CHECK-FIXES: static constexpr auto v4 = 1WBU;
static_assert(v4 == 1WBU);

static constexpr auto v5 = 1wbU;
// CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'wbU', which is not uppercase
// CHECK-MESSAGES-NEXT: static constexpr auto v5 = 1wbU;
// CHECK-MESSAGES-NEXT: ^~~~
// CHECK-MESSAGES-NEXT: WBU{{$}}
// CHECK-FIXES: static constexpr auto v5 = 1WBU;
static_assert(v5 == 1WBU);

static constexpr auto v6 = 1WBU; // OK.
static_assert(v6 == 1WBU);

// Unsigned _BitInt()

static constexpr auto v7 = 1uwb;
// CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'uwb', which is not uppercase
// CHECK-MESSAGES-NEXT: static constexpr auto v7 = 1uwb;
// CHECK-MESSAGES-NEXT: ^~~~
// CHECK-MESSAGES-NEXT: UWB{{$}}
// CHECK-FIXES: static constexpr auto v7 = 1UWB;
static_assert(v7 == 1UWB);

static constexpr auto v8 = 1uWB;
// CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'uWB', which is not uppercase
// CHECK-MESSAGES-NEXT: static constexpr auto v8 = 1uWB;
// CHECK-MESSAGES-NEXT: ^~~~
// CHECK-MESSAGES-NEXT: UWB{{$}}
// CHECK-FIXES: static constexpr auto v8 = 1UWB;
static_assert(v8 == 1UWB);

static constexpr auto v9 = 1Uwb;
// CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'Uwb', which is not uppercase
// CHECK-MESSAGES-NEXT: static constexpr auto v9 = 1Uwb;
// CHECK-MESSAGES-NEXT: ^~~~
// CHECK-MESSAGES-NEXT: UWB{{$}}
// CHECK-FIXES: static constexpr auto v9 = 1UWB;
static_assert(v9 == 1UWB);

static constexpr auto v10 = 1UWB; // OK.
static_assert(v10 == 1UWB);
}

void decimal_floating_point_suffix() {
// _Decimal32

#if 0
static constexpr auto v1 = 1.df;
// DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'df', which is not uppercase
// DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v1 = 1.df;
// DISABLED-CHECK-MESSAGES-NEXT: ^ ~
// DISABLED-CHECK-MESSAGES-NEXT: DF{{$}}
// DISABLED-CHECK-FIXES: static constexpr auto v1 = 1.DF;
static_assert(v1 == 1.DF);

static constexpr auto v2 = 1.e0df;
// DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'df', which is not uppercase
// DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v2 = 1.e0df;
// DISABLED-CHECK-MESSAGES-NEXT: ^ ~
// DISABLED-CHECK-MESSAGES-NEXT: DF{{$}}
// DISABLED-CHECK-FIXES: static constexpr auto v2 = 1.e0DF;
static_assert(v2 == 1.DF);

static constexpr auto v3 = 1.DF; // OK.
static_assert(v3 == 1.DF);

static constexpr auto v4 = 1.e0DF; // OK.
static_assert(v4 == 1.DF);
#endif

// _Decimal64

#if 0
static constexpr auto v5 = 1.dd;
// DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'dd', which is not uppercase
// DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v5 = 1.dd;
// DISABLED-CHECK-MESSAGES-NEXT: ^ ~
// DISABLED-CHECK-MESSAGES-NEXT: DD{{$}}
// DISABLED-CHECK-FIXES: static constexpr auto v5 = 1.DD;
static_assert(v5 == 1.DD);

static constexpr auto v6 = 1.e0dd;
// DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'dd', which is not uppercase
// DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v6 = 1.e0dd;
// DISABLED-CHECK-MESSAGES-NEXT: ^ ~
// DISABLED-CHECK-MESSAGES-NEXT: DD{{$}}
// DISABLED-CHECK-FIXES: static constexpr auto v6 = 1.e0DD;
static_assert(v6 == 1.DD);

static constexpr auto v7 = 1.DD; // OK.
static_assert(v7 == 1.DD);

static constexpr auto v8 = 1.e0DD; // OK.
static_assert(v8 == 1.DD);
#endif

// _Decimal128

#if 0
static constexpr auto v9 = 1.dl;
// DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'dl', which is not uppercase
// DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v9 = 1.dl;
// DISABLED-CHECK-MESSAGES-NEXT: ^ ~
// DISABLED-CHECK-MESSAGES-NEXT: DL{{$}}
// DISABLED-CHECK-FIXES: static constexpr auto v9 = 1.DL;
static_assert(v9 == 1.DL);

static constexpr auto v10 = 1.e0dl;
// DISABLED-CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'dl', which is not uppercase
// DISABLED-CHECK-MESSAGES-NEXT: static constexpr auto v10 = 1.e0dl;
// DISABLED-CHECK-MESSAGES-NEXT: ^ ~
// DISABLED-CHECK-MESSAGES-NEXT: DL{{$}}
// DISABLED-CHECK-FIXES: static constexpr auto v10 = 1.e0DL;
static_assert(v10 == 1.DL);

static constexpr auto v11 = 1.DL; // OK.
static_assert(v11 == 1.DL);

static constexpr auto v12 = 1.e0DL; // OK.
static_assert(v12 == 1.DL);
#endif
}
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