1 /* Keeping a unique copy of strings. 2 3 Copyright (C) 2002-2003, 2008-2012 Free Software Foundation, Inc. 4 5 This file is part of Bison, the GNU Compiler Compiler. 6 7 This program is free software: you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation, either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #ifndef UNIQSTR_H_ 21 # define UNIQSTR_H_ 22 23 /*-----------------------------------------. 24 | Pointers to unique copies of C strings. | 25 `-----------------------------------------*/ 26 27 typedef char const *uniqstr; 28 29 /* Return the uniqstr for STR. */ 30 uniqstr uniqstr_new (char const *str); 31 32 /* Return a uniqstr built by vsprintf. In order to simply concatenate 33 strings, use UNIQSTR_CONCAT, which is a convenient wrapper around 34 this function. */ 35 uniqstr uniqstr_vsprintf (char const *format, ...) 36 __attribute__ ((__format__ (__printf__, 1, 2))); 37 38 /* Two uniqstr values have the same value iff they are the same. */ 39 #define UNIQSTR_EQ(USTR1, USTR2) (!!((USTR1) == (USTR2))) 40 41 /* Compare two uniqstr a la strcmp: negative for <, nul for =, and 42 positive for >. Undefined order, relies on addresses. */ 43 #define UNIQSTR_CMP(USTR1, USTR2) ((USTR1) - (USTR2)) 44 45 /*--------------------------------------. 46 | Initializing, destroying, debugging. | 47 `--------------------------------------*/ 48 49 /* Create the string table. */ 50 void uniqstrs_new (void); 51 52 /* Die if STR is not a uniqstr. */ 53 void uniqstr_assert (char const *str); 54 55 /* Free all the memory allocated for symbols. */ 56 void uniqstrs_free (void); 57 58 /* Report them all. */ 59 void uniqstrs_print (void); 60 61 /*----------------. 62 | Concatenation. | 63 `----------------*/ 64 65 /* Concatenate at most 20 strings and return a uniqstr. The goal of 66 this macro is to make the caller's code a little more succinct 67 without a trivial uniqstr_vsprintf format string to maintain 68 (for example, "%s%s%s") while still benefitting from gcc's type 69 checking. Unfortunately, because of the missing format string in the 70 macro invocation, the argument number reported by gcc for a bad 71 argument type is 1 too large. */ 72 #define UNIQSTR_CONCAT(...) \ 73 uniqstr_vsprintf (UNIQSTR_GEN_FORMAT (__VA_ARGS__, \ 74 "%s", "%s", "%s", "%s", "%s", \ 75 "%s", "%s", "%s", "%s", "%s", \ 76 "%s", "%s", "%s", "%s", "%s", \ 77 "%s", "%s", "%s", "%s", "%s"), \ 78 __VA_ARGS__) 79 80 #define UNIQSTR_GEN_FORMAT(F1, F2, F3, F4, F5, \ 81 F6, F7, F8, F9, F10, \ 82 F11, F12, F13, F14, F15, \ 83 F16, F17, F18, F19, F20, \ 84 ...) \ 85 UNIQSTR_GEN_FORMAT_ (__VA_ARGS__, \ 86 "", "", "", "", "", \ 87 "", "", "", "", "", \ 88 "", "", "", "", "", \ 89 "", "", "", "", "") 90 91 #define UNIQSTR_GEN_FORMAT_(F1, F2, F3, F4, F5, \ 92 F6, F7, F8, F9, F10, \ 93 F11, F12, F13, F14, F15, \ 94 F16, F17, F18, F19, F20, ...) \ 95 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 \ 96 F11 F12 F13 F14 F15 F16 F17 F18 F19 F20 97 98 #endif /* ! defined UNIQSTR_H_ */ 99
