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annotate clang/test/Preprocessor/macro_fn_comma_swallow2.c @ 236:c4bab56944e8 llvm-original

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LLVM 16
author kono
date Wed, 09 Nov 2022 17:45:10 +0900
parents 1d019706d866
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
150
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1 // Test the __VA_ARGS__ comma swallowing extensions of various compiler dialects.
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2
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3 // RUN: %clang_cc1 -E %s | FileCheck -check-prefix=GCC -strict-whitespace %s
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4 // RUN: %clang_cc1 -E -std=c99 %s | FileCheck -check-prefix=C99 -strict-whitespace %s
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5 // RUN: %clang_cc1 -E -std=c11 %s | FileCheck -check-prefix=C99 -strict-whitespace %s
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6 // RUN: %clang_cc1 -E -x c++ %s | FileCheck -check-prefix=GCC -strict-whitespace %s
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7 // RUN: %clang_cc1 -E -std=gnu99 %s | FileCheck -check-prefix=GCC -strict-whitespace %s
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8 // RUN: %clang_cc1 -E -fms-compatibility %s | FileCheck -check-prefix=MS -strict-whitespace %s
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9 // RUN: %clang_cc1 -E -DNAMED %s | FileCheck -check-prefix=GCC -strict-whitespace %s
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10 // RUN: %clang_cc1 -E -std=c99 -DNAMED %s | FileCheck -check-prefix=C99 -strict-whitespace %s
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11
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12
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13 #ifndef NAMED
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14 # define A(...) [ __VA_ARGS__ ]
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15 # define B(...) [ , __VA_ARGS__ ]
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16 # define C(...) [ , ## __VA_ARGS__ ]
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17 # define D(A,...) [ A , ## __VA_ARGS__ ]
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18 # define E(A,...) [ __VA_ARGS__ ## A ]
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19 #else
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20 // These are the GCC named argument versions of the C99-style variadic macros.
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21 // Note that __VA_ARGS__ *may* be used as the name, this is not prohibited!
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22 # define A(__VA_ARGS__...) [ __VA_ARGS__ ]
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23 # define B(__VA_ARGS__...) [ , __VA_ARGS__ ]
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24 # define C(__VA_ARGS__...) [ , ## __VA_ARGS__ ]
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25 # define D(A,__VA_ARGS__...) [ A , ## __VA_ARGS__ ]
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26 # define E(A,__VA_ARGS__...) [ __VA_ARGS__ ## A ]
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27 #endif
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28
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29
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30 1: A() B() C() D() E()
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31 2: A(a) B(a) C(a) D(a) E(a)
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32 3: A(,) B(,) C(,) D(,) E(,)
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33 4: A(a,b,c) B(a,b,c) C(a,b,c) D(a,b,c) E(a,b,c)
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34 5: A(a,b,) B(a,b,) C(a,b,) D(a,b,)
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35
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36 // The GCC ", ## __VA_ARGS__" extension swallows the comma when followed by
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37 // empty __VA_ARGS__. This extension does not apply in -std=c99 mode, but
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38 // does apply in C++.
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39 //
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40 // GCC: 1: [ ] [ , ] [ ] [ ] [ ]
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41 // GCC: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ]
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42 // GCC: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ]
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43 // GCC: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ]
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44 // GCC: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ]
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45
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46 // Under C99 standard mode, the GCC ", ## __VA_ARGS__" extension *does not*
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47 // swallow the comma when followed by empty __VA_ARGS__.
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48 //
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49 // C99: 1: [ ] [ , ] [ , ] [ ] [ ]
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50 // C99: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ]
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51 // C99: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ]
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52 // C99: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ]
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53 // C99: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ]
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54
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55 // Microsoft's extension is on ", __VA_ARGS__" (without explicit ##) where
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56 // the comma is swallowed when followed by empty __VA_ARGS__.
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57 //
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58 // MS: 1: [ ] [ ] [ ] [ ] [ ]
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59 // MS: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ]
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60 // MS: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ]
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61 // MS: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ]
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62 // MS: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ]
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63
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64 // FIXME: Item 3(d) in MS output should be [ ] not [ , ]