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概要[]
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300 /* A cpp_reader encapsulates the "state" of a pre-processor run.
301 Applying cpp_get_token repeatedly yields a stream of pre-processor
302 tokens. Usually, there is only one cpp_reader object active. */
303 struct cpp_reader
304 {
305 /* Top of buffer stack. */
306 cpp_buffer *buffer;
307
308 /* Overlaid buffer (can be different after processing #include). */
309 cpp_buffer *overlaid_buffer;
310
311 /* Lexer state. */
312 struct lexer_state state;
313
314 /* Source line tracking. */
315 struct line_maps *line_table;
316
317 /* The line of the '#' of the current directive. */
318 source_location directive_line;
319
320 /* Memory buffers. */
321 _cpp_buff *a_buff; /* Aligned permanent storage. */
322 _cpp_buff *u_buff; /* Unaligned permanent storage. */
323 _cpp_buff *free_buffs; /* Free buffer chain. */
324
325 /* Context stack. */
326 struct cpp_context base_context;
327 struct cpp_context *context;
328
329 /* If in_directive, the directive if known. */
330 const struct directive *directive;
331
332 /* Token generated while handling a directive, if any. */
333 cpp_token directive_result;
334
335 /* Search paths for include files. */
336 struct cpp_dir *quote_include; /* "" */
337 struct cpp_dir *bracket_include; /* <> */
338 struct cpp_dir no_search_path; /* No path. */
339
340 /* Chain of all hashed _cpp_file instances. */
341 struct _cpp_file *all_files;
342
343 struct _cpp_file *main_file;
344
345 /* File and directory hash table. */
346 struct htab *file_hash;
347 struct htab *dir_hash;
348 struct file_hash_entry *file_hash_entries;
349 unsigned int file_hash_entries_allocated, file_hash_entries_used;
350
351 /* Nonzero means don't look for #include "foo" the source-file
352 directory. */
353 bool quote_ignores_source_dir;
354
355 /* Nonzero if any file has contained #pragma once or #import has
356 been used. */
357 bool seen_once_only;
358
359 /* Multiple include optimization. */
360 const cpp_hashnode *mi_cmacro;
361 const cpp_hashnode *mi_ind_cmacro;
362 bool mi_valid;
363
364 /* Lexing. */
365 cpp_token *cur_token;
366 tokenrun base_run, *cur_run;
367 unsigned int lookaheads;
368
369 /* Nonzero prevents the lexer from re-using the token runs. */
370 unsigned int keep_tokens;
371
372 /* Error counter for exit code. */
373 unsigned int errors;
374
375 /* Buffer to hold macro definition string. */
376 unsigned char *macro_buffer;
377 unsigned int macro_buffer_len;
378
379 /* Descriptor for converting from the source character set to the
380 execution character set. */
381 struct cset_converter narrow_cset_desc;
382
383 /* Descriptor for converting from the source character set to the
384 wide execution character set. */
385 struct cset_converter wide_cset_desc;
386
387 /* Date and time text. Calculated together if either is requested. */
388 const unsigned char *date;
389 const unsigned char *time;
390
391 /* EOF token, and a token forcing paste avoidance. */
392 cpp_token avoid_paste;
393 cpp_token eof;
394
395 /* Opaque handle to the dependencies of mkdeps.c. */
396 struct deps *deps;
397
398 /* Obstack holding all macro hash nodes. This never shrinks.
399 See identifiers.c */
400 struct obstack hash_ob;
401
402 /* Obstack holding buffer and conditional structures. This is a
403 real stack. See directives.c. */
404 struct obstack buffer_ob;
405
406 /* Pragma table - dynamic, because a library user can add to the
407 list of recognized pragmas. */
408 struct pragma_entry *pragmas;
409
410 /* Call backs to cpplib client. */
411 struct cpp_callbacks cb;
412
413 /* Identifier hash table. */
414 struct ht *hash_table;
415
416 /* Expression parser stack. */
417 struct op *op_stack, *op_limit;
418
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419 /* User visible options. */
420 struct cpp_options opts;
421
422 /* Special nodes - identifiers with predefined significance to the
423 preprocessor. */
424 struct spec_nodes spec_nodes;
425
426 /* Whether cpplib owns the hashtable. */
427 bool our_hashtable;
428
429 /* Traditional preprocessing output buffer (a logical line). */
430 struct
431 {
432 unsigned char *base;
433 unsigned char *limit;
434 unsigned char *cur;
435 source_location first_line;
436 } out;
437
438 /* Used for buffer overlays by traditional.c. */
439 const unsigned char *saved_cur, *saved_rlimit, *saved_line_base;
440
441 /* A saved list of the defined macros, for dependency checking
442 of precompiled headers. */
443 struct cpp_savedstate *savedstate;
444 };
