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1 // RUN: %clang_cc1 %s -fsyntax-only -std=c99 -pedantic -verify -Wundef
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2 // RUN: %clang_cc1 %s -fsyntax-only -x c++ -pedantic -verify -Wundef
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3 // RUN: not %clang_cc1 %s -fsyntax-only -std=c99 -pedantic -Wundef 2>&1 | FileCheck -strict-whitespace %s
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4
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5 #define \u00FC
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6 #define a\u00FD() 0
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7 #ifndef \u00FC
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8 #error "This should never happen"
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9 #endif
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10
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11 #if a\u00FD()
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12 #error "This should never happen"
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13 #endif
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14
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15 #if a\U000000FD()
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16 #error "This should never happen"
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17 #endif
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18
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19 #if \uarecool // expected-warning{{incomplete universal character name; treating as '\' followed by identifier}} expected-error {{invalid token at start of a preprocessor expression}}
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20 #endif
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21 #if \uwerecool // expected-warning{{\u used with no following hex digits; treating as '\' followed by identifier}} expected-error {{invalid token at start of a preprocessor expression}}
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22 #endif
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23 #if \U0001000 // expected-warning{{incomplete universal character name; treating as '\' followed by identifier}} expected-error {{invalid token at start of a preprocessor expression}}
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24 #endif
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25
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26 // Make sure we reject disallowed UCNs
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27 #define \ufffe // expected-error {{macro name must be an identifier}}
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28 #define \U10000000 // expected-error {{macro name must be an identifier}}
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29 #define \u0061 // expected-error {{character 'a' cannot be specified by a universal character name}} expected-error {{macro name must be an identifier}}
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30
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31 #define a\u0024
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32
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33 #if \u0110 // expected-warning {{is not defined, evaluates to 0}}
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34 #endif
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35
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36
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37 #define \u0110 1 / 0
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38 #if \u0110 // expected-error {{division by zero in preprocessor expression}}
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39 #endif
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40
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41 #define STRINGIZE(X) # X
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42
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43 extern int check_size[sizeof(STRINGIZE(\u0112)) == 3 ? 1 : -1];
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44
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45 // Check that we still diagnose disallowed UCNs in #if 0 blocks.
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46 // C99 5.1.1.2p1 and C++11 [lex.phases]p1 dictate that preprocessor tokens are
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47 // formed before directives are parsed.
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48 // expected-error@+4 {{character 'a' cannot be specified by a universal character name}}
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49 #if 0
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50 #define \ufffe // okay
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51 #define \U10000000 // okay
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52 #define \u0061 // error, but -verify only looks at comments outside #if 0
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53 #endif
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54
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55
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56 // A UCN formed by token pasting is undefined in both C99 and C++.
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57 // Right now we don't do anything special, which causes us to coincidentally
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58 // accept the first case below but reject the second two.
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59 #define PASTE(A, B) A ## B
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60 extern int PASTE(\, u00FD);
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61 extern int PASTE(\u, 00FD); // expected-warning{{\u used with no following hex digits}}
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62 extern int PASTE(\u0, 0FD); // expected-warning{{incomplete universal character name}}
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63 #ifdef __cplusplus
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64 // expected-error@-3 {{expected unqualified-id}}
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65 // expected-error@-3 {{expected unqualified-id}}
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66 #else
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67 // expected-error@-6 {{expected identifier}}
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68 // expected-error@-6 {{expected identifier}}
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69 #endif
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70
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71
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72 // A UCN produced by line splicing is valid in C99 but undefined in C++.
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73 // Since undefined behavior can do anything including working as intended,
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74 // we just accept it in C++ as well.;
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75 #define newline_1_\u00F\
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76 C 1
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77 #define newline_2_\u00\
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78 F\
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79 C 1
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80 #define newline_3_\u\
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81 00\
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82 FC 1
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83 #define newline_4_\\
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84 u00FC 1
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85 #define newline_5_\\
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86 u\
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87 \
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88 0\
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89 0\
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90 F\
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91 C 1
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92
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93 #if (newline_1_\u00FC && newline_2_\u00FC && newline_3_\u00FC && \
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94 newline_4_\u00FC && newline_5_\u00FC)
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95 #else
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96 #error "Line splicing failed to produce UCNs"
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97 #endif
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98
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99
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100 #define capital_u_\U00FC
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101 // expected-warning@-1 {{incomplete universal character name}} expected-note@-1 {{did you mean to use '\u'?}} expected-warning@-1 {{whitespace}}
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102 // CHECK: note: did you mean to use '\u'?
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103 // CHECK-NEXT: #define capital_u_\U00FC
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104 // CHECK-NEXT: {{^ \^}}
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105 // CHECK-NEXT: {{^ u}}
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