Fe file change

概要

• gcc-4.1.0/gcc/c-lex.cにて定義

引数

• const struct line_map *new_map

実装

213 void
214 fe_file_change (const struct line_map *new_map)
215 {
216   if (new_map == NULL)
217     return;
218 

• ファイルが変わったのは新しくファイルと取り込むから

219   if (new_map->reason == LC_ENTER)
220     {
221       /* Don't stack the main buffer on the input stack;
222          we already did in compile_file.  */
223       if (!MAIN_FILE_P (new_map))
224         {
225 #ifdef USE_MAPPED_LOCATION
226           int included_at = LAST_SOURCE_LINE_LOCATION (new_map - 1);
227 
228           input_location = included_at;
229           push_srcloc (new_map->start_location);
230 #else
231           int included_at = LAST_SOURCE_LINE (new_map - 1);
232 
233           input_line = included_at;
234           push_srcloc (new_map->to_file, 1);
235 #endif
236           (*debug_hooks->start_source_file) (included_at, new_map->to_file);
237 #ifndef NO_IMPLICIT_EXTERN_C
238           if (c_header_level)
239             ++c_header_level;
240           else if (new_map->sysp == 2)
241             {
242               c_header_level = 1;
243               ++pending_lang_change;
244             }
245 #endif
246         }
247     }

• ファイルが変わったのはファイルを抜けることになったから

248   else if (new_map->reason == LC_LEAVE)
249     {
250 #ifndef NO_IMPLICIT_EXTERN_C
251       if (c_header_level && --c_header_level == 0)
252         {
253           if (new_map->sysp == 2)
254             warning (0, "badly nested C headers from preprocessor");
255           --pending_lang_change;
256         }
257 #endif
258       pop_srcloc ();
259 
260       (*debug_hooks->end_source_file) (new_map->to_line);
261     }
262 

263   update_header_times (new_map->to_file);
264   in_system_header = new_map->sysp != 0;
265 #ifdef USE_MAPPED_LOCATION
266   input_location = new_map->start_location;
267 #else
268   input_filename = new_map->to_file;
269   input_line = new_map->to_line;
270 #endif
271 }

リンク元