gcc/pretty-print.h

   1 /* Various declarations for language-independent pretty-print subroutines.
   2    Copyright (C) 2002-2013 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 #include "input.h"
  26
  27 /* Maximum number of format string arguments.  */
  28 #define PP_NL_ARGMAX   30
  29
  30 /* The type of a text to be formatted according a format specification
  31    along with a list of things.  */
  32 typedef struct
  33 {
  34   const char *format_spec;
  35   va_list *args_ptr;
  36   int err_no;  /* for %m */
  37   location_t *locus;
  38   void **x_data;
  39 } text_info;
  40
  41 /* How often diagnostics are prefixed by their locations:
  42    o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
  43    o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit only once;
  44    o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit each time a physical
  45    line is started.  */
  46 typedef enum
  47 {
  48   DIAGNOSTICS_SHOW_PREFIX_ONCE       = 0x0,
  49   DIAGNOSTICS_SHOW_PREFIX_NEVER      = 0x1,
  50   DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE = 0x2
  51 } diagnostic_prefixing_rule_t;
  52
  53 /* The chunk_info data structure forms a stack of the results from the
  54    first phase of formatting (pp_base_format) which have not yet been
  55    output (pp_base_output_formatted_text).  A stack is necessary because
  56    the diagnostic starter may decide to generate its own output by way
  57    of the formatter.  */
  58 struct chunk_info
  59 {
  60   /* Pointer to previous chunk on the stack.  */
  61   struct chunk_info *prev;
  62
  63   /* Array of chunks to output.  Each chunk is a NUL-terminated string.
  64      In the first phase of formatting, even-numbered chunks are
  65      to be output verbatim, odd-numbered chunks are format specifiers.
  66      The second phase replaces all odd-numbered chunks with formatted
  67      text, and the third phase simply emits all the chunks in sequence
  68      with appropriate line-wrapping.  */
  69   const char *args[PP_NL_ARGMAX * 2];
  70 };
  71
  72 /* The output buffer datatype.  This is best seen as an abstract datatype
  73    whose fields should not be accessed directly by clients.  */
  74 typedef struct
  75 {
  76   /* Obstack where the text is built up.  */
  77   struct obstack formatted_obstack;
  78
  79   /* Obstack containing a chunked representation of the format
  80      specification plus arguments.  */
  81   struct obstack chunk_obstack;
  82
  83   /* Currently active obstack: one of the above two.  This is used so
  84      that the text formatters don't need to know which phase we're in.  */
  85   struct obstack *obstack;
  86
  87   /* Stack of chunk arrays.  These come from the chunk_obstack.  */
  88   struct chunk_info *cur_chunk_array;
  89
  90   /* Where to output formatted text.  */
  91   FILE *stream;
  92
  93   /* The amount of characters output so far.  */
  94   int line_length;
  95
  96   /* This must be large enough to hold any printed integer or
  97      floating-point value.  */
  98   char digit_buffer[128];
  99 } output_buffer;
 100
 101 /* The type of pretty-printer flags passed to clients.  */
 102 typedef unsigned int pp_flags;
 103
 104 typedef enum
 105 {
 106   pp_none, pp_before, pp_after
 107 } pp_padding;
 108
 109 /* Structure for switching in and out of verbatim mode in a convenient
 110    manner.  */
 111 typedef struct
 112 {
 113   /* Current prefixing rule.  */
 114   diagnostic_prefixing_rule_t rule;
 115
 116   /* The ideal upper bound of number of characters per line, as suggested
 117      by front-end.  */
 118   int line_cutoff;
 119 } pp_wrapping_mode_t;
 120
 121 /* Maximum characters per line in automatic line wrapping mode.
 122    Zero means don't wrap lines.  */
 123 #define pp_line_cutoff(PP)  pp_base (PP)->wrapping.line_cutoff
 124
 125 /* Prefixing rule used in formatting a diagnostic message.  */
 126 #define pp_prefixing_rule(PP)  pp_base (PP)->wrapping.rule
 127
 128 /* Get or set the wrapping mode as a single entity.  */
 129 #define pp_wrapping_mode(PP) pp_base (PP)->wrapping
 130
 131 /* The type of a hook that formats client-specific data onto a pretty_pinter.
 132    A client-supplied formatter returns true if everything goes well,
 133    otherwise it returns false.  */
 134 typedef bool (*printer_fn) (pretty_printer *, text_info *, const char *,
 135                             int, bool, bool, bool);
 136
 137 /* Client supplied function used to decode formats.  */
 138 #define pp_format_decoder(PP) pp_base (PP)->format_decoder
 139
 140 /* TRUE if a newline character needs to be added before further
 141    formatting.  */
 142 #define pp_needs_newline(PP)  pp_base (PP)->need_newline
 143
 144 /* True if PRETTY-PRINTER is in line-wrapping mode.  */
 145 #define pp_is_wrapping_line(PP) (pp_line_cutoff (PP) > 0)
 146
 147 /* The amount of whitespace to be emitted when starting a new line.  */
 148 #define pp_indentation(PP) pp_base (PP)->indent_skip
 149
 150 /* True if identifiers are translated to the locale character set on
 151    output.  */
 152 #define pp_translate_identifiers(PP) pp_base (PP)->translate_identifiers
 153
 154 /* The data structure that contains the bare minimum required to do
 155    proper pretty-printing.  Clients may derived from this structure
 156    and add additional fields they need.  */
 157 struct pretty_print_info
 158 {
 159   /* Where we print external representation of ENTITY.  */
 160   output_buffer *buffer;
 161
 162   /* The prefix for each new line.  */
 163   const char *prefix;
 164
 165   /* Where to put whitespace around the entity being formatted.  */
 166   pp_padding padding;
 167
 168   /* The real upper bound of number of characters per line, taking into
 169      account the case of a very very looong prefix.  */
 170   int maximum_length;
 171
 172   /* Indentation count.  */
 173   int indent_skip;
 174
 175   /* Current wrapping mode.  */
 176   pp_wrapping_mode_t wrapping;
 177
 178   /* If non-NULL, this function formats a TEXT into the BUFFER.  When called,
 179      TEXT->format_spec points to a format code.  FORMAT_DECODER should call
 180      pp_string (and related functions) to add data to the BUFFER.
 181      FORMAT_DECODER can read arguments from *TEXT->args_pts using VA_ARG.
 182      If the BUFFER needs additional characters from the format string, it
 183      should advance the TEXT->format_spec as it goes.  When FORMAT_DECODER
 184      returns, TEXT->format_spec should point to the last character processed.
 185   */
 186   printer_fn format_decoder;
 187
 188   /* Nonzero if current PREFIX was emitted at least once.  */
 189   bool emitted_prefix;
 190
 191   /* Nonzero means one should emit a newline before outputting anything.  */
 192   bool need_newline;
 193
 194   /* Nonzero means identifiers are translated to the locale character
 195      set on output.  */
 196   bool translate_identifiers;
 197 };
 198
 199 #define pp_set_line_maximum_length(PP, L) \
 200    pp_base_set_line_maximum_length (pp_base (PP), L)
 201 #define pp_set_prefix(PP, P)    pp_base_set_prefix (pp_base (PP), P)
 202 #define pp_get_prefix(PP)       pp_base_get_prefix (pp_base (PP))
 203 static inline const char *
 204 pp_base_get_prefix (const pretty_printer *pp) { return pp->prefix; }
 205 #define pp_destroy_prefix(PP)   pp_base_destroy_prefix (pp_base (PP))
 206 #define pp_remaining_character_count_for_line(PP) \
 207   pp_base_remaining_character_count_for_line (pp_base (PP))
 208 #define pp_clear_output_area(PP) \
 209   pp_base_clear_output_area (pp_base (PP))
 210 #define pp_formatted_text(PP)   pp_base_formatted_text (pp_base (PP))
 211 #define pp_last_position_in_text(PP) \
 212   pp_base_last_position_in_text (pp_base (PP))
 213 #define pp_emit_prefix(PP)      pp_base_emit_prefix (pp_base (PP))
 214 #define pp_append_text(PP, B, E) \
 215   pp_base_append_text (pp_base (PP), B, E)
 216 #define pp_flush(PP)            pp_base_flush (pp_base (PP))
 217 #define pp_format(PP, TI)       pp_base_format (pp_base (PP), TI)
 218 #define pp_output_formatted_text(PP) \
 219   pp_base_output_formatted_text (pp_base (PP))
 220 #define pp_format_verbatim(PP, TI) \
 221   pp_base_format_verbatim (pp_base (PP), TI)
 222
 223 #define pp_character(PP, C)     pp_base_character (pp_base (PP), C)
 224 #define pp_string(PP, S)        pp_base_string (pp_base (PP), S)
 225 #define pp_newline(PP)          pp_base_newline (pp_base (PP))
 226
 227 #define pp_space(PP)            pp_character (PP, ' ')
 228 #define pp_left_paren(PP)       pp_character (PP, '(')
 229 #define pp_right_paren(PP)      pp_character (PP, ')')
 230 #define pp_left_bracket(PP)     pp_character (PP, '[')
 231 #define pp_right_bracket(PP)    pp_character (PP, ']')
 232 #define pp_left_brace(PP)       pp_character (PP, '{')
 233 #define pp_right_brace(PP)      pp_character (PP, '}')
 234 #define pp_semicolon(PP)        pp_character (PP, ';')
 235 #define pp_comma(PP)            pp_string (PP, ", ")
 236 #define pp_dot(PP)              pp_character (PP, '.')
 237 #define pp_colon(PP)            pp_character (PP, ':')
 238 #define pp_colon_colon(PP)      pp_string (PP, "::")
 239 #define pp_arrow(PP)            pp_string (PP, "->")
 240 #define pp_equal(PP)            pp_character (PP, '=')
 241 #define pp_question(PP)         pp_character (PP, '?')
 242 #define pp_bar(PP)              pp_character (PP, '|')
 243 #define pp_carret(PP)           pp_character (PP, '^')
 244 #define pp_ampersand(PP)        pp_character (PP, '&')
 245 #define pp_less(PP)             pp_character (PP, '<')
 246 #define pp_greater(PP)          pp_character (PP, '>')
 247 #define pp_plus(PP)             pp_character (PP, '+')
 248 #define pp_minus(PP)            pp_character (PP, '-')
 249 #define pp_star(PP)             pp_character (PP, '*')
 250 #define pp_slash(PP)            pp_character (PP, '/')
 251 #define pp_modulo(PP)           pp_character (PP, '%')
 252 #define pp_exclamation(PP)      pp_character (PP, '!')
 253 #define pp_complement(PP)       pp_character (PP, '~')
 254 #define pp_quote(PP)            pp_character (PP, '\'')
 255 #define pp_backquote(PP)        pp_character (PP, '`')
 256 #define pp_doublequote(PP)      pp_character (PP, '"')
 257 #define pp_newline_and_flush(PP)     \
 258   do {                               \
 259     pp_newline (PP);                 \
 260     pp_flush (PP);                   \
 261     pp_needs_newline (PP) = false;   \
 262   } while (0)
 263 #define pp_newline_and_indent(PP, N) \
 264   do {                               \
 265     pp_indentation (PP) += N;        \
 266     pp_newline (PP);                 \
 267     pp_base_indent (pp_base (PP));   \
 268     pp_needs_newline (PP) = false;   \
 269   } while (0)
 270 #define pp_maybe_newline_and_indent(PP, N) \
 271   if (pp_needs_newline (PP)) pp_newline_and_indent (PP, N)
 272 #define pp_maybe_space(PP)   pp_base_maybe_space (pp_base (PP))
 273 #define pp_separate_with(PP, C)     \
 274    do {                             \
 275      pp_character (PP, C);          \
 276      pp_space (PP);                 \
 277    } while (0)
 278 #define pp_scalar(PP, FORMAT, SCALAR)                         \
 279   do                                                          \
 280     {                                                         \
 281       sprintf (pp_buffer (PP)->digit_buffer, FORMAT, SCALAR); \
 282       pp_string (PP, pp_buffer (PP)->digit_buffer);           \
 283     }                                                         \
 284   while (0)
 285 #define pp_decimal_int(PP, I)  pp_scalar (PP, "%d", I)
 286 #define pp_unsigned_wide_integer(PP, I) \
 287    pp_scalar (PP, HOST_WIDE_INT_PRINT_UNSIGNED, (unsigned HOST_WIDE_INT) I)
 288 #define pp_wide_integer(PP, I) \
 289    pp_scalar (PP, HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT) I)
 290 #define pp_widest_integer(PP, I) \
 291    pp_scalar (PP, HOST_WIDEST_INT_PRINT_DEC, (HOST_WIDEST_INT) I)
 292 #define pp_pointer(PP, P)      pp_scalar (PP, "%p", P)
 293
 294 #define pp_identifier(PP, ID)  pp_string (PP, (pp_translate_identifiers (PP) \
 295                                           ? identifier_to_locale (ID)   \
 296                                           : (ID)))
 297
 298
 299 #define pp_buffer(PP) pp_base (PP)->buffer
 300 /* Clients that directly derive from pretty_printer need to override
 301    this macro to return a pointer to the base pretty_printer structure.  */
 302 #define pp_base(PP) (PP)
 303
 304 extern void pp_construct (pretty_printer *, const char *, int);
 305 extern void pp_base_set_line_maximum_length (pretty_printer *, int);
 306 extern void pp_base_set_prefix (pretty_printer *, const char *);
 307 extern void pp_base_destroy_prefix (pretty_printer *);
 308 extern int pp_base_remaining_character_count_for_line (pretty_printer *);
 309 extern void pp_base_clear_output_area (pretty_printer *);
 310 extern const char *pp_base_formatted_text (pretty_printer *);
 311 extern const char *pp_base_last_position_in_text (const pretty_printer *);
 312 extern void pp_base_emit_prefix (pretty_printer *);
 313 extern void pp_base_append_text (pretty_printer *, const char *, const char *);
 314
 315 /* If we haven't already defined a front-end-specific diagnostics
 316    style, use the generic one.  */
 317 #ifdef GCC_DIAG_STYLE
 318 #define GCC_PPDIAG_STYLE GCC_DIAG_STYLE
 319 #else
 320 #define GCC_PPDIAG_STYLE __gcc_diag__
 321 #endif
 322
 323 /* This header may be included before diagnostics-core.h, hence the duplicate
 324    definitions to allow for GCC-specific formats.  */
 325 #if GCC_VERSION >= 3005
 326 #define ATTRIBUTE_GCC_PPDIAG(m, n) __attribute__ ((__format__ (GCC_PPDIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 327 #else
 328 #define ATTRIBUTE_GCC_PPDIAG(m, n) ATTRIBUTE_NONNULL(m)
 329 #endif
 330 extern void pp_printf (pretty_printer *, const char *, ...)
 331      ATTRIBUTE_GCC_PPDIAG(2,3);
 332
 333 extern void pp_verbatim (pretty_printer *, const char *, ...)
 334      ATTRIBUTE_GCC_PPDIAG(2,3);
 335 extern void pp_base_flush (pretty_printer *);
 336 extern void pp_base_format (pretty_printer *, text_info *);
 337 extern void pp_base_output_formatted_text (pretty_printer *);
 338 extern void pp_base_format_verbatim (pretty_printer *, text_info *);
 339
 340 extern void pp_base_indent (pretty_printer *);
 341 extern void pp_base_newline (pretty_printer *);
 342 extern void pp_base_character (pretty_printer *, int);
 343 extern void pp_base_string (pretty_printer *, const char *);
 344 extern void pp_write_text_to_stream (pretty_printer *);
 345 extern void pp_write_text_as_dot_label_to_stream (pretty_printer *, bool);
 346 extern void pp_base_maybe_space (pretty_printer *);
 347
 348 /* Switch into verbatim mode and return the old mode.  */
 349 static inline pp_wrapping_mode_t
 350 pp_set_verbatim_wrapping_ (pretty_printer *pp)
 351 {
 352   pp_wrapping_mode_t oldmode = pp_wrapping_mode (pp);
 353   pp_line_cutoff (pp) = 0;
 354   pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_NEVER;
 355   return oldmode;
 356 }
 357 #define pp_set_verbatim_wrapping(PP) pp_set_verbatim_wrapping_ (pp_base (PP))
 358
 359 extern const char *identifier_to_locale (const char *);
 360 extern void *(*identifier_to_locale_alloc) (size_t);
 361 extern void (*identifier_to_locale_free) (void *);
 362
 363 #endif /* GCC_PRETTY_PRINT_H */