1 // RUN: %clang_cc1 %s -fsyntax-only -std=c99 -pedantic -verify -Wundef 2 // RUN: %clang_cc1 %s -fsyntax-only -x c++ -pedantic -verify -Wundef 3 // RUN: not %clang_cc1 %s -fsyntax-only -std=c99 -pedantic -Wundef 2>&1 | FileCheck -strict-whitespace %s 4 5 #define \u00FC 6 #define a\u00FD() 0 7 #ifndef \u00FC 8 #error "This should never happen" 9 #endif 10 11 #if a\u00FD() 12 #error "This should never happen" 13 #endif 14 15 #if a\U000000FD() 16 #error "This should never happen" 17 #endif 18 19 #if \uarecool // expected-warning{{incomplete universal character name; treating as '\' followed by identifier}} expected-error {{invalid token at start of a preprocessor expression}} 20 #endif 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}} 22 #endif 23 #if \U0001000 // expected-warning{{incomplete universal character name; treating as '\' followed by identifier}} expected-error {{invalid token at start of a preprocessor expression}} 24 #endif 25 26 // Make sure we reject disallowed UCNs 27 #define \ufffe // expected-error {{macro name must be an identifier}} 28 #define \U10000000 // expected-error {{macro name must be an identifier}} 29 #define \u0061 // expected-error {{character 'a' cannot be specified by a universal character name}} expected-error {{macro name must be an identifier}} 30 31 // FIXME: Not clear what our behavior should be here; \u0024 is "$". 32 #define a\u0024 // expected-warning {{whitespace}} 33 34 #if \u0110 // expected-warning {{is not defined, evaluates to 0}} 35 #endif 36 37 38 #define \u0110 1 / 0 39 #if \u0110 // expected-error {{division by zero in preprocessor expression}} 40 #endif 41 42 #define STRINGIZE(X) # X 43 44 extern int check_size[sizeof(STRINGIZE(\u0112)) == 3 ? 1 : -1]; 45 46 // Check that we still diagnose disallowed UCNs in #if 0 blocks. 47 // C99 5.1.1.2p1 and C++11 [lex.phases]p1 dictate that preprocessor tokens are 48 // formed before directives are parsed. 49 // expected-error@+4 {{character 'a' cannot be specified by a universal character name}} 50 #if 0 51 #define \ufffe // okay 52 #define \U10000000 // okay 53 #define \u0061 // error, but -verify only looks at comments outside #if 0 54 #endif 55 56 57 // A UCN formed by token pasting is undefined in both C99 and C++. 58 // Right now we don't do anything special, which causes us to coincidentally 59 // accept the first case below but reject the second two. 60 #define PASTE(A, B) A ## B 61 extern int PASTE(\, u00FD); 62 extern int PASTE(\u, 00FD); // expected-warning{{\u used with no following hex digits}} 63 extern int PASTE(\u0, 0FD); // expected-warning{{incomplete universal character name}} 64 #ifdef __cplusplus 65 // expected-error@-3 {{expected unqualified-id}} 66 // expected-error@-3 {{expected unqualified-id}} 67 #else 68 // expected-error@-6 {{expected identifier}} 69 // expected-error@-6 {{expected identifier}} 70 #endif 71 72 73 // A UCN produced by line splicing is valid in C99 but undefined in C++. 74 // Since undefined behavior can do anything including working as intended, 75 // we just accept it in C++ as well.; 76 #define newline_1_\u00F\ 77 C 1 78 #define newline_2_\u00\ 79 F\ 80 C 1 81 #define newline_3_\u\ 82 00\ 83 FC 1 84 #define newline_4_\\ 85 u00FC 1 86 #define newline_5_\\ 87 u\ 88 \ 89 0\ 90 0\ 91 F\ 92 C 1 93 94 #if (newline_1_\u00FC && newline_2_\u00FC && newline_3_\u00FC && \ 95 newline_4_\u00FC && newline_5_\u00FC) 96 #else 97 #error "Line splicing failed to produce UCNs" 98 #endif 99 100 101 #define capital_u_\U00FC 102 // expected-warning@-1 {{incomplete universal character name}} expected-note@-1 {{did you mean to use '\u'?}} expected-warning@-1 {{whitespace}} 103 // CHECK: note: did you mean to use '\u'? 104 // CHECK-NEXT: #define capital_u_\U00FC 105 // CHECK-NEXT: {{^ \^}} 106 // CHECK-NEXT: {{^ u}} 107