1 /* Various declarations for language-independent pretty-print subroutines. 2 Copyright (C) 2002-2018 Free Software Foundation, Inc. 3 Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net> 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 3, or (at your option) any later 10 version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 #ifndef GCC_PRETTY_PRINT_H 22 #define GCC_PRETTY_PRINT_H 23 24 #include "obstack.h" 25 26 /* Maximum number of format string arguments. */ 27 #define PP_NL_ARGMAX 30 28 29 /* The type of a text to be formatted according a format specification 30 along with a list of things. */ 31 struct text_info 32 { 33 const char *format_spec; 34 va_list *args_ptr; 35 int err_no; /* for %m */ 36 void **x_data; 37 rich_location *m_richloc; 38 39 void set_location (unsigned int idx, location_t loc, bool caret_p); 40 location_t get_location (unsigned int index_of_location) const; 41 }; 42 43 /* How often diagnostics are prefixed by their locations: 44 o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported; 45 o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit only once; 46 o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit each time a physical 47 line is started. */ 48 enum diagnostic_prefixing_rule_t 49 { 50 DIAGNOSTICS_SHOW_PREFIX_ONCE = 0x0, 51 DIAGNOSTICS_SHOW_PREFIX_NEVER = 0x1, 52 DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE = 0x2 53 }; 54 55 /* The chunk_info data structure forms a stack of the results from the 56 first phase of formatting (pp_format) which have not yet been 57 output (pp_output_formatted_text). A stack is necessary because 58 the diagnostic starter may decide to generate its own output by way 59 of the formatter. */ 60 struct chunk_info 61 { 62 /* Pointer to previous chunk on the stack. */ 63 struct chunk_info *prev; 64 65 /* Array of chunks to output. Each chunk is a NUL-terminated string. 66 In the first phase of formatting, even-numbered chunks are 67 to be output verbatim, odd-numbered chunks are format specifiers. 68 The second phase replaces all odd-numbered chunks with formatted 69 text, and the third phase simply emits all the chunks in sequence 70 with appropriate line-wrapping. */ 71 const char *args[PP_NL_ARGMAX * 2]; 72 }; 73 74 /* The output buffer datatype. This is best seen as an abstract datatype 75 whose fields should not be accessed directly by clients. */ 76 struct output_buffer 77 { 78 output_buffer (); 79 ~output_buffer (); 80 81 /* Obstack where the text is built up. */ 82 struct obstack formatted_obstack; 83 84 /* Obstack containing a chunked representation of the format 85 specification plus arguments. */ 86 struct obstack chunk_obstack; 87 88 /* Currently active obstack: one of the above two. This is used so 89 that the text formatters don't need to know which phase we're in. */ 90 struct obstack *obstack; 91 92 /* Stack of chunk arrays. These come from the chunk_obstack. */ 93 struct chunk_info *cur_chunk_array; 94 95 /* Where to output formatted text. */ 96 FILE *stream; 97 98 /* The amount of characters output so far. */ 99 int line_length; 100 101 /* This must be large enough to hold any printed integer or 102 floating-point value. */ 103 char digit_buffer[128]; 104 105 /* Nonzero means that text should be flushed when 106 appropriate. Otherwise, text is buffered until either 107 pp_really_flush or pp_clear_output_area are called. */ 108 bool flush_p; 109 }; 110 111 /* Finishes constructing a NULL-terminated character string representing 112 the buffered text. */ 113 static inline const char * 114 output_buffer_formatted_text (output_buffer *buff) 115 { 116 obstack_1grow (buff->obstack, '\0'); 117 return (const char *) obstack_base (buff->obstack); 118 } 119 120 /* Append to the output buffer a string specified by its 121 STARTing character and LENGTH. */ 122 static inline void 123 output_buffer_append_r (output_buffer *buff, const char *start, int length) 124 { 125 gcc_checking_assert (start); 126 obstack_grow (buff->obstack, start, length); 127 for (int i = 0; i < length; i++) 128 if (start[i] == '\n') 129 buff->line_length = 0; 130 else 131 buff->line_length++; 132 } 133 134 /* Return a pointer to the last character emitted in the 135 output_buffer. A NULL pointer means no character available. */ 136 static inline const char * 137 output_buffer_last_position_in_text (const output_buffer *buff) 138 { 139 const char *p = NULL; 140 struct obstack *text = buff->obstack; 141 142 if (obstack_base (text) != obstack_next_free (text)) 143 p = ((const char *) obstack_next_free (text)) - 1; 144 return p; 145 } 146 147 148 /* The type of pretty-printer flags passed to clients. */ 149 typedef unsigned int pp_flags; 150 151 enum pp_padding 152 { 153 pp_none, pp_before, pp_after 154 }; 155 156 /* Structure for switching in and out of verbatim mode in a convenient 157 manner. */ 158 struct pp_wrapping_mode_t 159 { 160 /* Current prefixing rule. */ 161 diagnostic_prefixing_rule_t rule; 162 163 /* The ideal upper bound of number of characters per line, as suggested 164 by front-end. */ 165 int line_cutoff; 166 }; 167 168 /* Maximum characters per line in automatic line wrapping mode. 169 Zero means don't wrap lines. */ 170 #define pp_line_cutoff(PP) (PP)->wrapping.line_cutoff 171 172 /* Prefixing rule used in formatting a diagnostic message. */ 173 #define pp_prefixing_rule(PP) (PP)->wrapping.rule 174 175 /* Get or set the wrapping mode as a single entity. */ 176 #define pp_wrapping_mode(PP) (PP)->wrapping 177 178 /* The type of a hook that formats client-specific data onto a pretty_printer. 179 A client-supplied formatter returns true if everything goes well, 180 otherwise it returns false. */ 181 typedef bool (*printer_fn) (pretty_printer *, text_info *, const char *, 182 int, bool, bool, bool, bool *, const char **); 183 184 /* Client supplied function used to decode formats. */ 185 #define pp_format_decoder(PP) (PP)->format_decoder 186 187 /* Base class for an optional client-supplied object for doing additional 188 processing between stages 2 and 3 of formatted printing. */ 189 class format_postprocessor 190 { 191 public: 192 virtual ~format_postprocessor () {} 193 virtual void handle (pretty_printer *) = 0; 194 }; 195 196 /* TRUE if a newline character needs to be added before further 197 formatting. */ 198 #define pp_needs_newline(PP) (PP)->need_newline 199 200 /* True if PRETTY-PRINTER is in line-wrapping mode. */ 201 #define pp_is_wrapping_line(PP) (pp_line_cutoff (PP) > 0) 202 203 /* The amount of whitespace to be emitted when starting a new line. */ 204 #define pp_indentation(PP) (PP)->indent_skip 205 206 /* True if identifiers are translated to the locale character set on 207 output. */ 208 #define pp_translate_identifiers(PP) (PP)->translate_identifiers 209 210 /* True if colors should be shown. */ 211 #define pp_show_color(PP) (PP)->show_color 212 213 /* The data structure that contains the bare minimum required to do 214 proper pretty-printing. Clients may derived from this structure 215 and add additional fields they need. */ 216 struct pretty_printer 217 { 218 // Default construct a pretty printer with specified prefix 219 // and a maximum line length cut off limit. 220 explicit pretty_printer (const char* = NULL, int = 0); 221 222 virtual ~pretty_printer (); 223 224 /* Where we print external representation of ENTITY. */ 225 output_buffer *buffer; 226 227 /* The prefix for each new line. */ 228 const char *prefix; 229 230 /* Where to put whitespace around the entity being formatted. */ 231 pp_padding padding; 232 233 /* The real upper bound of number of characters per line, taking into 234 account the case of a very very looong prefix. */ 235 int maximum_length; 236 237 /* Indentation count. */ 238 int indent_skip; 239 240 /* Current wrapping mode. */ 241 pp_wrapping_mode_t wrapping; 242 243 /* If non-NULL, this function formats a TEXT into the BUFFER. When called, 244 TEXT->format_spec points to a format code. FORMAT_DECODER should call 245 pp_string (and related functions) to add data to the BUFFER. 246 FORMAT_DECODER can read arguments from *TEXT->args_pts using VA_ARG. 247 If the BUFFER needs additional characters from the format string, it 248 should advance the TEXT->format_spec as it goes. When FORMAT_DECODER 249 returns, TEXT->format_spec should point to the last character processed. 250 The QUOTE and BUFFER_PTR are passed in, to allow for deferring-handling 251 of format codes (e.g. %H and %I in the C++ frontend). */ 252 printer_fn format_decoder; 253 254 /* If non-NULL, this is called by pp_format once after all format codes 255 have been processed, to allow for client-specific postprocessing. 256 This is used by the C++ frontend for handling the %H and %I 257 format codes (which interract with each other). */ 258 format_postprocessor *m_format_postprocessor; 259 260 /* Nonzero if current PREFIX was emitted at least once. */ 261 bool emitted_prefix; 262 263 /* Nonzero means one should emit a newline before outputting anything. */ 264 bool need_newline; 265 266 /* Nonzero means identifiers are translated to the locale character 267 set on output. */ 268 bool translate_identifiers; 269 270 /* Nonzero means that text should be colorized. */ 271 bool show_color; 272 }; 273 274 static inline const char * 275 pp_get_prefix (const pretty_printer *pp) { return pp->prefix; } 276 277 #define pp_space(PP) pp_character (PP, ' ') 278 #define pp_left_paren(PP) pp_character (PP, '(') 279 #define pp_right_paren(PP) pp_character (PP, ')') 280 #define pp_left_bracket(PP) pp_character (PP, '[') 281 #define pp_right_bracket(PP) pp_character (PP, ']') 282 #define pp_left_brace(PP) pp_character (PP, '{') 283 #define pp_right_brace(PP) pp_character (PP, '}') 284 #define pp_semicolon(PP) pp_character (PP, ';') 285 #define pp_comma(PP) pp_character (PP, ',') 286 #define pp_dot(PP) pp_character (PP, '.') 287 #define pp_colon(PP) pp_character (PP, ':') 288 #define pp_colon_colon(PP) pp_string (PP, "::") 289 #define pp_arrow(PP) pp_string (PP, "->") 290 #define pp_equal(PP) pp_character (PP, '=') 291 #define pp_question(PP) pp_character (PP, '?') 292 #define pp_bar(PP) pp_character (PP, '|') 293 #define pp_bar_bar(PP) pp_string (PP, "||") 294 #define pp_carret(PP) pp_character (PP, '^') 295 #define pp_ampersand(PP) pp_character (PP, '&') 296 #define pp_ampersand_ampersand(PP) pp_string (PP, "&&") 297 #define pp_less(PP) pp_character (PP, '<') 298 #define pp_less_equal(PP) pp_string (PP, "<=") 299 #define pp_greater(PP) pp_character (PP, '>') 300 #define pp_greater_equal(PP) pp_string (PP, ">=") 301 #define pp_plus(PP) pp_character (PP, '+') 302 #define pp_minus(PP) pp_character (PP, '-') 303 #define pp_star(PP) pp_character (PP, '*') 304 #define pp_slash(PP) pp_character (PP, '/') 305 #define pp_modulo(PP) pp_character (PP, '%') 306 #define pp_exclamation(PP) pp_character (PP, '!') 307 #define pp_complement(PP) pp_character (PP, '~') 308 #define pp_quote(PP) pp_character (PP, '\'') 309 #define pp_backquote(PP) pp_character (PP, '`') 310 #define pp_doublequote(PP) pp_character (PP, '"') 311 #define pp_underscore(PP) pp_character (PP, '_') 312 #define pp_maybe_newline_and_indent(PP, N) \ 313 if (pp_needs_newline (PP)) pp_newline_and_indent (PP, N) 314 #define pp_scalar(PP, FORMAT, SCALAR) \ 315 do \ 316 { \ 317 sprintf (pp_buffer (PP)->digit_buffer, FORMAT, SCALAR); \ 318 pp_string (PP, pp_buffer (PP)->digit_buffer); \ 319 } \ 320 while (0) 321 #define pp_decimal_int(PP, I) pp_scalar (PP, "%d", I) 322 #define pp_unsigned_wide_integer(PP, I) \ 323 pp_scalar (PP, HOST_WIDE_INT_PRINT_UNSIGNED, (unsigned HOST_WIDE_INT) I) 324 #define pp_wide_int(PP, W, SGN) \ 325 do \ 326 { \ 327 print_dec (W, pp_buffer (PP)->digit_buffer, SGN); \ 328 pp_string (PP, pp_buffer (PP)->digit_buffer); \ 329 } \ 330 while (0) 331 #define pp_pointer(PP, P) pp_scalar (PP, "%p", P) 332 333 #define pp_identifier(PP, ID) pp_string (PP, (pp_translate_identifiers (PP) \ 334 ? identifier_to_locale (ID) \ 335 : (ID))) 336 337 338 #define pp_buffer(PP) (PP)->buffer 339 340 extern void pp_set_line_maximum_length (pretty_printer *, int); 341 extern void pp_set_prefix (pretty_printer *, const char *); 342 extern void pp_destroy_prefix (pretty_printer *); 343 extern int pp_remaining_character_count_for_line (pretty_printer *); 344 extern void pp_clear_output_area (pretty_printer *); 345 extern const char *pp_formatted_text (pretty_printer *); 346 extern const char *pp_last_position_in_text (const pretty_printer *); 347 extern void pp_emit_prefix (pretty_printer *); 348 extern void pp_append_text (pretty_printer *, const char *, const char *); 349 extern void pp_newline_and_flush (pretty_printer *); 350 extern void pp_newline_and_indent (pretty_printer *, int); 351 extern void pp_separate_with (pretty_printer *, char); 352 353 /* If we haven't already defined a front-end-specific diagnostics 354 style, use the generic one. */ 355 #ifdef GCC_DIAG_STYLE 356 #define GCC_PPDIAG_STYLE GCC_DIAG_STYLE 357 #else 358 #define GCC_PPDIAG_STYLE __gcc_diag__ 359 #endif 360 361 /* This header may be included before diagnostics-core.h, hence the duplicate 362 definitions to allow for GCC-specific formats. */ 363 #if GCC_VERSION >= 3005 364 #define ATTRIBUTE_GCC_PPDIAG(m, n) __attribute__ ((__format__ (GCC_PPDIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m) 365 #else 366 #define ATTRIBUTE_GCC_PPDIAG(m, n) ATTRIBUTE_NONNULL(m) 367 #endif 368 extern void pp_printf (pretty_printer *, const char *, ...) 369 ATTRIBUTE_GCC_PPDIAG(2,3); 370 371 extern void pp_verbatim (pretty_printer *, const char *, ...) 372 ATTRIBUTE_GCC_PPDIAG(2,3); 373 extern void pp_flush (pretty_printer *); 374 extern void pp_really_flush (pretty_printer *); 375 extern void pp_format (pretty_printer *, text_info *); 376 extern void pp_output_formatted_text (pretty_printer *); 377 extern void pp_format_verbatim (pretty_printer *, text_info *); 378 379 extern void pp_indent (pretty_printer *); 380 extern void pp_newline (pretty_printer *); 381 extern void pp_character (pretty_printer *, int); 382 extern void pp_string (pretty_printer *, const char *); 383 extern void pp_write_text_to_stream (pretty_printer *); 384 extern void pp_write_text_as_dot_label_to_stream (pretty_printer *, bool); 385 extern void pp_maybe_space (pretty_printer *); 386 387 extern void pp_begin_quote (pretty_printer *, bool); 388 extern void pp_end_quote (pretty_printer *, bool); 389 390 /* Switch into verbatim mode and return the old mode. */ 391 static inline pp_wrapping_mode_t 392 pp_set_verbatim_wrapping_ (pretty_printer *pp) 393 { 394 pp_wrapping_mode_t oldmode = pp_wrapping_mode (pp); 395 pp_line_cutoff (pp) = 0; 396 pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_NEVER; 397 return oldmode; 398 } 399 #define pp_set_verbatim_wrapping(PP) pp_set_verbatim_wrapping_ (PP) 400 401 extern const char *identifier_to_locale (const char *); 402 extern void *(*identifier_to_locale_alloc) (size_t); 403 extern void (*identifier_to_locale_free) (void *); 404 405 /* Print I to PP in decimal. */ 406 407 inline void 408 pp_wide_integer (pretty_printer *pp, HOST_WIDE_INT i) 409 { 410 pp_scalar (pp, HOST_WIDE_INT_PRINT_DEC, i); 411 } 412 413 template<unsigned int N, typename T> 414 void pp_wide_integer (pretty_printer *pp, const poly_int_pod<N, T> &); 415 416 #endif /* GCC_PRETTY_PRINT_H */ 417