clang/test/Preprocessor/macro_vaopt_expand.cpp

   1 // RUN: %clang_cc1 -E %s -pedantic -std=c++2a | FileCheck -strict-whitespace %s
   2
   3 #define LPAREN (
   4 #define RPAREN )
   5
   6 #define A0 expandedA0
   7 #define A1  expandedA1 A0
   8 #define A2  expandedA2 A1
   9 #define A3  expandedA3 A2
  10
  11 #define A() B LPAREN )
  12 #define B() C LPAREN )
  13 #define C() D LPAREN )
  14
  15
  16 #define F(x, y) x + y
  17 #define ELLIP_FUNC(...) __VA_OPT__(__VA_ARGS__)
  18
  19 1: ELLIP_FUNC(F, LPAREN, 'a', 'b', RPAREN);
  20 2: ELLIP_FUNC(F LPAREN 'a', 'b' RPAREN);
  21 #undef F
  22 #undef ELLIP_FUNC
  23
  24 // CHECK: 1: F, (, 'a', 'b', );
  25 // CHECK: 2: 'a' + 'b';
  26
  27 #define F(...) f(0 __VA_OPT__(,) __VA_ARGS__)
  28 3: F(a, b, c) // replaced by f(0, a, b, c)
  29 4: F() // replaced by f(0)
  30
  31 // CHECK: 3: f(0 , a, b, c)
  32 // CHECK: 4: f(0 )
  33 #undef F
  34
  35 #define G(X, ...) f(0, X __VA_OPT__(,) __VA_ARGS__)
  36
  37 5: G(a, b, c) // replaced by f(0, a , b, c)
  38 6: G(a) // replaced by f(0, a)
  39 7: G(a,) // replaced by f(0, a)
  40 7.1: G(a,,)
  41
  42
  43 // CHECK: 5: f(0, a , b, c)
  44 // CHECK: 6: f(0, a )
  45 // CHECK: 7: f(0, a )
  46 // CHECK: 7.1: f(0, a , ,)
  47 #undef G
  48
  49 #define HT_B() TONG
  50
  51 #define F(x, ...) HT_ ## __VA_OPT__(x x A()  #x)
  52
  53 8: F(1)
  54 9: F(A(),1)
  55
  56 // CHECK: 8: HT_
  57 // CHECK: 9: TONG C ( ) B ( ) "A()"
  58 #undef HT_B
  59 #undef F
  60
  61 #define F(a,...) #__VA_OPT__(A1 a)
  62
  63 10: F(A())
  64 11: F(A1 A(), 1)
  65 // CHECK: 10: ""
  66 // CHECK: 11: "A1 expandedA1 expandedA0 B ( )"
  67 #undef F
  68
  69
  70 #define F(a,...) a ## __VA_OPT__(A1 a) ## __VA_ARGS__ ## a
  71 12.0: F()
  72 12: F(,)
  73 13: F(B,)
  74 // CHECK: 12.0:
  75 // CHECK: 12:
  76 // CHECK: 13: BB
  77 #undef F
  78
  79 #define F(...) #__VA_OPT__()  X ## __VA_OPT__()  #__VA_OPT__(        )
  80
  81 14: F()
  82 15: F(1)
  83
  84 // CHECK: 14: "" X ""
  85 // CHECK: 15: "" X ""
  86
  87 #undef F
  88
  89 #define SDEF(sname, ...) S sname __VA_OPT__(= { __VA_ARGS__ })
  90
  91 16: SDEF(foo); // replaced by S foo;
  92 17: SDEF(bar, 1, 2); // replaced by S bar = { 1, 2 };
  93
  94 // CHECK: 16: S foo ;
  95 // CHECK: 17: S bar = { 1, 2 };
  96 #undef SDEF
  97
  98 #define F(a,...) A() #__VA_OPT__(A3 __VA_ARGS__ a ## __VA_ARGS__ ## a ## C A3) A()
  99
 100 18: F()
 101 19: F(,)
 102 20: F(,A3)
 103 21: F(A3, A(),A0)
 104
 105
 106 // CHECK: 18: B ( ) "" B ( )
 107 // CHECK: 19: B ( ) "" B ( )
 108 // CHECK: 20: B ( ) "A3 expandedA3 expandedA2 expandedA1 expandedA0 A3C A3" B ( )
 109 // CHECK: 21: B ( ) "A3 B ( ),expandedA0 A3A(),A0A3C A3" B ( )
 110
 111 #undef F
 112
 113 #define F(a,...) A() #__VA_OPT__(A3 __VA_ARGS__ a ## __VA_ARGS__ ## a ## C A3) a __VA_OPT__(A0 __VA_ARGS__ a ## __VA_ARGS__ ## a ## C A0) A()
 114
 115 22: F()
 116 23: F(,)
 117 24: F(,A0)
 118 25: F(A0, A(),A0)
 119
 120
 121 // CHECK: 22: B ( ) "" B ( )
 122 // CHECK: 23: B ( ) "" B ( )
 123 // CHECK: 24: B ( ) "A3 expandedA0 A0C A3" expandedA0 expandedA0 A0C expandedA0 B ( )
 124 // CHECK: 25: B ( ) "A3 B ( ),expandedA0 A0A(),A0A0C A3" expandedA0 expandedA0 C ( ),expandedA0 A0A(),A0A0C expandedA0 B ( )
 125
 126 #undef F
 127
 128 #define F(a,...)  __VA_OPT__(B a ## a) ## 1
 129 #define G(a,...)  __VA_OPT__(B a) ## 1
 130 26: F(,1)
 131 26_1: G(,1)
 132 // CHECK: 26: B 1
 133 // CHECK: 26_1: B 1
 134 #undef F
 135 #undef G
 136
 137 #define F(a,...)  B ## __VA_OPT__(a 1) ## 1
 138 #define G(a,...)  B ## __VA_OPT__(a ## a 1) ## 1
 139
 140 27: F(,1)
 141 27_1: F(A0,1)
 142 28: G(,1)
 143 // CHECK: 27: B 11
 144 // CHECK: 27_1: BexpandedA0 11
 145 // CHECK: 28: B 11
 146
 147 #undef F
 148 #undef G