1 /* 2 * Copyright 2010 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 */ 23 24 #include <assert.h> 25 #include <string.h> 26 #include <ctype.h> 27 #include "glcpp.h" 28 #include "main/core.h" /* for isblank() on MSVC */ 29 30 void 31 glcpp_error (YYLTYPE *locp, glcpp_parser_t *parser, const char *fmt, ...) 32 { 33 va_list ap; 34 35 parser->error = 1; 36 parser->info_log = hieralloc_asprintf_append(parser->info_log, 37 "%u:%u(%u): " 38 "preprocessor error: ", 39 locp->source, 40 locp->first_line, 41 locp->first_column); 42 va_start(ap, fmt); 43 parser->info_log = hieralloc_vasprintf_append(parser->info_log, fmt, ap); 44 va_end(ap); 45 parser->info_log = hieralloc_strdup_append(parser->info_log, "\n"); 46 } 47 48 void 49 glcpp_warning (YYLTYPE *locp, glcpp_parser_t *parser, const char *fmt, ...) 50 { 51 va_list ap; 52 53 parser->info_log = hieralloc_asprintf_append(parser->info_log, 54 "%u:%u(%u): " 55 "preprocessor warning: ", 56 locp->source, 57 locp->first_line, 58 locp->first_column); 59 va_start(ap, fmt); 60 parser->info_log = hieralloc_vasprintf_append(parser->info_log, fmt, ap); 61 va_end(ap); 62 parser->info_log = hieralloc_strdup_append(parser->info_log, "\n"); 63 } 64 65 /* Searches backwards for '^ *#' from a given starting point. */ 66 static int 67 in_directive(const char *shader, const char *ptr) 68 { 69 assert(ptr >= shader); 70 71 /* Search backwards for '#'. If we find a \n first, it doesn't count */ 72 for (; ptr >= shader && *ptr != '#'; ptr--) { 73 if (*ptr == '\n') 74 return 0; 75 } 76 if (ptr >= shader) { 77 /* Found '#'...look for spaces preceded by a newline */ 78 for (ptr--; ptr >= shader && isblank(*ptr); ptr--); 79 // FIXME: I don't think the '\n' case can happen 80 if (ptr < shader || *ptr == '\n') 81 return 1; 82 } 83 return 0; 84 } 85 86 /* Remove any line continuation characters in preprocessing directives. 87 * However, ignore any in GLSL code, as "There is no line continuation 88 * character" (1.30 page 9) in GLSL. 89 */ 90 static char * 91 remove_line_continuations(glcpp_parser_t *ctx, const char *shader) 92 { 93 int in_continued_line = 0; 94 int extra_newlines = 0; 95 char *clean = hieralloc_strdup(ctx, ""); 96 const char *search_start = shader; 97 const char *newline; 98 while ((newline = strchr(search_start, '\n')) != NULL) { 99 const char *backslash = NULL; 100 101 /* # of characters preceding the newline. */ 102 int n = newline - shader; 103 104 /* Find the preceding '\', if it exists */ 105 if (n >= 1 && newline[-1] == '\\') 106 backslash = newline - 1; 107 else if (n >= 2 && newline[-1] == '\r' && newline[-2] == '\\') 108 backslash = newline - 2; 109 110 /* Double backslashes don't count (the backslash is escaped) */ 111 if (backslash != NULL && backslash[-1] == '\\') { 112 backslash = NULL; 113 } 114 115 if (backslash != NULL) { 116 /* We found a line continuation, but do we care? */ 117 if (!in_continued_line) { 118 if (in_directive(shader, backslash)) { 119 in_continued_line = 1; 120 extra_newlines = 0; 121 } 122 } 123 if (in_continued_line) { 124 /* Copy everything before the \ */ 125 clean = hieralloc_strndup_append(clean, shader, backslash - shader); 126 shader = newline + 1; 127 extra_newlines++; 128 } 129 } else if (in_continued_line) { 130 /* Copy everything up to and including the \n */ 131 clean = hieralloc_strndup_append(clean, shader, newline - shader + 1); 132 shader = newline + 1; 133 /* Output extra newlines to make line numbers match */ 134 for (; extra_newlines > 0; extra_newlines--) 135 clean = hieralloc_strdup_append(clean, "\n"); 136 in_continued_line = 0; 137 } 138 search_start = newline + 1; 139 } 140 clean = hieralloc_strdup_append(clean, shader); 141 return clean; 142 } 143 144 int 145 preprocess(void *hieralloc_ctx, const char **shader, char **info_log, 146 const struct gl_extensions *extensions, int api) 147 { 148 int errors; 149 glcpp_parser_t *parser = glcpp_parser_create (extensions, api); 150 *shader = remove_line_continuations(parser, *shader); 151 152 glcpp_lex_set_source_string (parser, *shader); 153 154 glcpp_parser_parse (parser); 155 156 if (parser->skip_stack) 157 glcpp_error (&parser->skip_stack->loc, parser, "Unterminated #if\n"); 158 159 *info_log = hieralloc_strdup_append(*info_log, parser->info_log); 160 161 hieralloc_steal(hieralloc_ctx, parser->output); 162 *shader = parser->output; 163 164 errors = parser->error; 165 glcpp_parser_destroy (parser); 166 return errors; 167 } 168
