gcc/cp/error.c

   1 /* Call-backs for C++ error reporting.
   2    This code is non-reentrant.
   3    Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003,
   4    2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   5    This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License 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 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "tree.h"
  26 #include "cp-tree.h"
  27 #include "toplev.h"
  28 #include "flags.h"
  29 #include "diagnostic.h"
  30 #include "tree-diagnostic.h"
  31 #include "langhooks-def.h"
  32 #include "intl.h"
  33 #include "cxx-pretty-print.h"
  34 #include "tree-pretty-print.h"
  35 #include "pointer-set.h"
  36
  37 #define pp_separate_with_comma(PP) pp_cxx_separate_with (PP, ',')
  38
  39 /* The global buffer where we dump everything.  It is there only for
  40    transitional purpose.  It is expected, in the near future, to be
  41    completely removed.  */
  42 static cxx_pretty_printer scratch_pretty_printer;
  43 #define cxx_pp (&scratch_pretty_printer)
  44
  45 /* Translate if being used for diagnostics, but not for dump files or
  46    __PRETTY_FUNCTION.  */
  47 #define M_(msgid) (pp_translate_identifiers (cxx_pp) ? _(msgid) : (msgid))
  48
  49 # define NEXT_CODE(T) (TREE_CODE (TREE_TYPE (T)))
  50
  51 static const char *args_to_string (tree, int);
  52 static const char *assop_to_string (enum tree_code);
  53 static const char *code_to_string (enum tree_code);
  54 static const char *cv_to_string (tree, int);
  55 static const char *decl_to_string (tree, int);
  56 static const char *expr_to_string (tree);
  57 static const char *fndecl_to_string (tree, int);
  58 static const char *op_to_string (enum tree_code);
  59 static const char *parm_to_string (int);
  60 static const char *type_to_string (tree, int);
  61
  62 static void dump_type (tree, int);
  63 static void dump_typename (tree, int);
  64 static void dump_simple_decl (tree, tree, int);
  65 static void dump_decl (tree, int);
  66 static void dump_template_decl (tree, int);
  67 static void dump_function_decl (tree, int);
  68 static void dump_expr (tree, int);
  69 static void dump_unary_op (const char *, tree, int);
  70 static void dump_binary_op (const char *, tree, int);
  71 static void dump_aggr_type (tree, int);
  72 static void dump_type_prefix (tree, int);
  73 static void dump_type_suffix (tree, int);
  74 static void dump_function_name (tree, int);
  75 static void dump_call_expr_args (tree, int, bool);
  76 static void dump_aggr_init_expr_args (tree, int, bool);
  77 static void dump_expr_list (tree, int);
  78 static void dump_global_iord (tree);
  79 static void dump_parameters (tree, int);
  80 static void dump_exception_spec (tree, int);
  81 static void dump_template_argument (tree, int);
  82 static void dump_template_argument_list (tree, int);
  83 static void dump_template_parameter (tree, int);
  84 static void dump_template_bindings (tree, tree, VEC(tree,gc) *);
  85 static void dump_scope (tree, int);
  86 static void dump_template_parms (tree, int, int);
  87 static int get_non_default_template_args_count (tree, int);
  88 static const char *function_category (tree);
  89 static void maybe_print_constexpr_context (diagnostic_context *);
  90 static void maybe_print_instantiation_context (diagnostic_context *);
  91 static void print_instantiation_full_context (diagnostic_context *);
  92 static void print_instantiation_partial_context (diagnostic_context *,
  93                                                  struct tinst_level *,
  94                                                  location_t);
  95 static void cp_diagnostic_starter (diagnostic_context *, diagnostic_info *);
  96 static void cp_diagnostic_finalizer (diagnostic_context *, diagnostic_info *);
  97 static void cp_print_error_function (diagnostic_context *, diagnostic_info *);
  98
  99 static bool cp_printer (pretty_printer *, text_info *, const char *,
 100                         int, bool, bool, bool);
 101 static location_t location_of (tree);
 102
 103 void
 104 init_error (void)
 105 {
 106   diagnostic_starter (global_dc) = cp_diagnostic_starter;
 107   diagnostic_finalizer (global_dc) = cp_diagnostic_finalizer;
 108   diagnostic_format_decoder (global_dc) = cp_printer;
 109
 110   pp_construct (pp_base (cxx_pp), NULL, 0);
 111   pp_cxx_pretty_printer_init (cxx_pp);
 112 }
 113
 114 /* Dump a scope, if deemed necessary.  */
 115
 116 static void
 117 dump_scope (tree scope, int flags)
 118 {
 119   int f = flags & (TFF_SCOPE | TFF_CHASE_TYPEDEF);
 120
 121   if (scope == NULL_TREE)
 122     return;
 123
 124   if (TREE_CODE (scope) == NAMESPACE_DECL)
 125     {
 126       if (scope != global_namespace)
 127         {
 128           dump_decl (scope, f);
 129           pp_cxx_colon_colon (cxx_pp);
 130         }
 131     }
 132   else if (AGGREGATE_TYPE_P (scope))
 133     {
 134       dump_type (scope, f);
 135       pp_cxx_colon_colon (cxx_pp);
 136     }
 137   else if ((flags & TFF_SCOPE) && TREE_CODE (scope) == FUNCTION_DECL)
 138     {
 139       dump_function_decl (scope, f);
 140       pp_cxx_colon_colon (cxx_pp);
 141     }
 142 }
 143
 144 /* Dump the template ARGument under control of FLAGS.  */
 145
 146 static void
 147 dump_template_argument (tree arg, int flags)
 148 {
 149   if (ARGUMENT_PACK_P (arg))
 150     dump_template_argument_list (ARGUMENT_PACK_ARGS (arg), flags);
 151   else if (TYPE_P (arg) || TREE_CODE (arg) == TEMPLATE_DECL)
 152     dump_type (arg, flags & ~TFF_CLASS_KEY_OR_ENUM);
 153   else
 154     {
 155       if (TREE_CODE (arg) == TREE_LIST)
 156         arg = TREE_VALUE (arg);
 157
 158       dump_expr (arg, (flags | TFF_EXPR_IN_PARENS) & ~TFF_CLASS_KEY_OR_ENUM);
 159     }
 160 }
 161
 162 /* Count the number of template arguments ARGS whose value does not
 163    match the (optional) default template parameter in PARAMS  */
 164
 165 static int
 166 get_non_default_template_args_count (tree args, int flags)
 167 {
 168   int n = TREE_VEC_LENGTH (INNERMOST_TEMPLATE_ARGS (args));
 169
 170   if (/* We use this flag when generating debug information.  We don't
 171          want to expand templates at this point, for this may generate
 172          new decls, which gets decl counts out of sync, which may in
 173          turn cause codegen differences between compilations with and
 174          without -g.  */
 175       (flags & TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS) != 0
 176       || !flag_pretty_templates)
 177     return n;
 178
 179   return GET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (INNERMOST_TEMPLATE_ARGS (args));
 180 }
 181
 182 /* Dump a template-argument-list ARGS (always a TREE_VEC) under control
 183    of FLAGS.  */
 184
 185 static void
 186 dump_template_argument_list (tree args, int flags)
 187 {
 188   int n = get_non_default_template_args_count (args, flags);
 189   int need_comma = 0;
 190   int i;
 191
 192   for (i = 0; i < n; ++i)
 193     {
 194       tree arg = TREE_VEC_ELT (args, i);
 195
 196       /* Only print a comma if we know there is an argument coming. In
 197          the case of an empty template argument pack, no actual
 198          argument will be printed.  */
 199       if (need_comma
 200           && (!ARGUMENT_PACK_P (arg)
 201               || TREE_VEC_LENGTH (ARGUMENT_PACK_ARGS (arg)) > 0))
 202         pp_separate_with_comma (cxx_pp);
 203
 204       dump_template_argument (arg, flags);
 205       need_comma = 1;
 206     }
 207 }
 208
 209 /* Dump a template parameter PARM (a TREE_LIST) under control of FLAGS.  */
 210
 211 static void
 212 dump_template_parameter (tree parm, int flags)
 213 {
 214   tree p;
 215   tree a;
 216
 217   if (parm == error_mark_node)
 218    return;
 219
 220   p = TREE_VALUE (parm);
 221   a = TREE_PURPOSE (parm);
 222
 223   if (TREE_CODE (p) == TYPE_DECL)
 224     {
 225       if (flags & TFF_DECL_SPECIFIERS)
 226         {
 227           pp_cxx_ws_string (cxx_pp, "class");
 228           if (TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (p)))
 229             pp_cxx_ws_string (cxx_pp, "...");
 230           if (DECL_NAME (p))
 231             pp_cxx_tree_identifier (cxx_pp, DECL_NAME (p));
 232         }
 233       else if (DECL_NAME (p))
 234         pp_cxx_tree_identifier (cxx_pp, DECL_NAME (p));
 235       else
 236         pp_cxx_canonical_template_parameter (cxx_pp, TREE_TYPE (p));
 237     }
 238   else
 239     dump_decl (p, flags | TFF_DECL_SPECIFIERS);
 240
 241   if ((flags & TFF_FUNCTION_DEFAULT_ARGUMENTS) && a != NULL_TREE)
 242     {
 243       pp_cxx_whitespace (cxx_pp);
 244       pp_equal (cxx_pp);
 245       pp_cxx_whitespace (cxx_pp);
 246       if (TREE_CODE (p) == TYPE_DECL || TREE_CODE (p) == TEMPLATE_DECL)
 247         dump_type (a, flags & ~TFF_CHASE_TYPEDEF);
 248       else
 249         dump_expr (a, flags | TFF_EXPR_IN_PARENS);
 250     }
 251 }
 252
 253 /* Dump, under control of FLAGS, a template-parameter-list binding.
 254    PARMS is a TREE_LIST of TREE_VEC of TREE_LIST and ARGS is a
 255    TREE_VEC.  */
 256
 257 static void
 258 dump_template_bindings (tree parms, tree args, VEC(tree,gc)* typenames)
 259 {
 260   int need_comma = 0;
 261   int i;
 262   tree t;
 263
 264   while (parms)
 265     {
 266       tree p = TREE_VALUE (parms);
 267       int lvl = TMPL_PARMS_DEPTH (parms);
 268       int arg_idx = 0;
 269       int i;
 270       tree lvl_args = NULL_TREE;
 271
 272       /* Don't crash if we had an invalid argument list.  */
 273       if (TMPL_ARGS_DEPTH (args) >= lvl)
 274         lvl_args = TMPL_ARGS_LEVEL (args, lvl);
 275
 276       for (i = 0; i < TREE_VEC_LENGTH (p); ++i)
 277         {
 278           tree arg = NULL_TREE;
 279
 280           /* Don't crash if we had an invalid argument list.  */
 281           if (lvl_args && NUM_TMPL_ARGS (lvl_args) > arg_idx)
 282             arg = TREE_VEC_ELT (lvl_args, arg_idx);
 283
 284           if (need_comma)
 285             pp_separate_with_comma (cxx_pp);
 286           dump_template_parameter (TREE_VEC_ELT (p, i), TFF_PLAIN_IDENTIFIER);
 287           pp_cxx_whitespace (cxx_pp);
 288           pp_equal (cxx_pp);
 289           pp_cxx_whitespace (cxx_pp);
 290           if (arg)
 291             {
 292               if (ARGUMENT_PACK_P (arg))
 293                 pp_cxx_left_brace (cxx_pp);
 294               dump_template_argument (arg, TFF_PLAIN_IDENTIFIER);
 295               if (ARGUMENT_PACK_P (arg))
 296                 pp_cxx_right_brace (cxx_pp);
 297             }
 298           else
 299             pp_string (cxx_pp, M_("<missing>"));
 300
 301           ++arg_idx;
 302           need_comma = 1;
 303         }
 304
 305       parms = TREE_CHAIN (parms);
 306     }
 307
 308   FOR_EACH_VEC_ELT (tree, typenames, i, t)
 309     {
 310       if (need_comma)
 311         pp_separate_with_comma (cxx_pp);
 312       dump_type (t, TFF_PLAIN_IDENTIFIER);
 313       pp_cxx_whitespace (cxx_pp);
 314       pp_equal (cxx_pp);
 315       pp_cxx_whitespace (cxx_pp);
 316       t = tsubst (t, args, tf_none, NULL_TREE);
 317       /* Strip typedefs.  We can't just use TFF_CHASE_TYPEDEF because
 318          pp_simple_type_specifier doesn't know about it.  */
 319       t = strip_typedefs (t);
 320       dump_type (t, TFF_PLAIN_IDENTIFIER);
 321     }
 322 }
 323
 324 /* Dump a human-readable equivalent of TYPE.  FLAGS controls the
 325    format.  */
 326
 327 static void
 328 dump_type (tree t, int flags)
 329 {
 330   if (t == NULL_TREE)
 331     return;
 332
 333   /* Don't print e.g. "struct mytypedef".  */
 334   if (TYPE_P (t) && typedef_variant_p (t))
 335     {
 336       tree decl = TYPE_NAME (t);
 337       if ((flags & TFF_CHASE_TYPEDEF)
 338           || DECL_SELF_REFERENCE_P (decl)
 339           || (!flag_pretty_templates
 340               && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)))
 341         t = strip_typedefs (t);
 342       else if (same_type_p (t, TREE_TYPE (decl)))
 343         t = decl;
 344       else
 345         {
 346           pp_cxx_cv_qualifier_seq (cxx_pp, t);
 347           pp_cxx_tree_identifier (cxx_pp, TYPE_IDENTIFIER (t));
 348           return;
 349         }
 350     }
 351
 352   if (TYPE_PTRMEMFUNC_P (t))
 353     goto offset_type;
 354
 355   switch (TREE_CODE (t))
 356     {
 357     case LANG_TYPE:
 358       if (t == init_list_type_node)
 359         pp_string (cxx_pp, M_("<brace-enclosed initializer list>"));
 360       else if (t == unknown_type_node)
 361         pp_string (cxx_pp, M_("<unresolved overloaded function type>"));
 362       else
 363         {
 364           pp_cxx_cv_qualifier_seq (cxx_pp, t);
 365           pp_cxx_tree_identifier (cxx_pp, TYPE_IDENTIFIER (t));
 366         }
 367       break;
 368
 369     case TREE_LIST:
 370       /* A list of function parms.  */
 371       dump_parameters (t, flags);
 372       break;
 373
 374     case IDENTIFIER_NODE:
 375       pp_cxx_tree_identifier (cxx_pp, t);
 376       break;
 377
 378     case TREE_BINFO:
 379       dump_type (BINFO_TYPE (t), flags);
 380       break;
 381
 382     case RECORD_TYPE:
 383     case UNION_TYPE:
 384     case ENUMERAL_TYPE:
 385       dump_aggr_type (t, flags);
 386       break;
 387
 388     case TYPE_DECL:
 389       if (flags & TFF_CHASE_TYPEDEF)
 390         {
 391           dump_type (DECL_ORIGINAL_TYPE (t)
 392                      ? DECL_ORIGINAL_TYPE (t) : TREE_TYPE (t), flags);
 393           break;
 394         }
 395       /* Else fall through.  */
 396
 397     case TEMPLATE_DECL:
 398     case NAMESPACE_DECL:
 399       dump_decl (t, flags & ~TFF_DECL_SPECIFIERS);
 400       break;
 401
 402     case INTEGER_TYPE:
 403     case REAL_TYPE:
 404     case VOID_TYPE:
 405     case BOOLEAN_TYPE:
 406     case COMPLEX_TYPE:
 407     case VECTOR_TYPE:
 408     case FIXED_POINT_TYPE:
 409       pp_type_specifier_seq (cxx_pp, t);
 410       break;
 411
 412     case TEMPLATE_TEMPLATE_PARM:
 413       /* For parameters inside template signature.  */
 414       if (TYPE_IDENTIFIER (t))
 415         pp_cxx_tree_identifier (cxx_pp, TYPE_IDENTIFIER (t));
 416       else
 417         pp_cxx_canonical_template_parameter (cxx_pp, t);
 418       break;
 419
 420     case BOUND_TEMPLATE_TEMPLATE_PARM:
 421       {
 422         tree args = TYPE_TI_ARGS (t);
 423         pp_cxx_cv_qualifier_seq (cxx_pp, t);
 424         pp_cxx_tree_identifier (cxx_pp, TYPE_IDENTIFIER (t));
 425         pp_cxx_begin_template_argument_list (cxx_pp);
 426         dump_template_argument_list (args, flags);
 427         pp_cxx_end_template_argument_list (cxx_pp);
 428       }
 429       break;
 430
 431     case TEMPLATE_TYPE_PARM:
 432       pp_cxx_cv_qualifier_seq (cxx_pp, t);
 433       if (TYPE_IDENTIFIER (t))
 434         pp_cxx_tree_identifier (cxx_pp, TYPE_IDENTIFIER (t));
 435       else
 436         pp_cxx_canonical_template_parameter
 437           (cxx_pp, TEMPLATE_TYPE_PARM_INDEX (t));
 438       break;
 439
 440       /* This is not always necessary for pointers and such, but doing this
 441          reduces code size.  */
 442     case ARRAY_TYPE:
 443     case POINTER_TYPE:
 444     case REFERENCE_TYPE:
 445     case OFFSET_TYPE:
 446     offset_type:
 447     case FUNCTION_TYPE:
 448     case METHOD_TYPE:
 449     {
 450       dump_type_prefix (t, flags);
 451       dump_type_suffix (t, flags);
 452       break;
 453     }
 454     case TYPENAME_TYPE:
 455       if (! (flags & TFF_CHASE_TYPEDEF)
 456           && DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
 457         {
 458           dump_decl (TYPE_NAME (t), TFF_PLAIN_IDENTIFIER);
 459           break;
 460         }
 461       pp_cxx_cv_qualifier_seq (cxx_pp, t);
 462       pp_cxx_ws_string (cxx_pp,
 463                          TYPENAME_IS_ENUM_P (t) ? "enum"
 464                          : TYPENAME_IS_CLASS_P (t) ? "class"
 465                          : "typename");
 466       dump_typename (t, flags);
 467       break;
 468
 469     case UNBOUND_CLASS_TEMPLATE:
 470       if (! (flags & TFF_UNQUALIFIED_NAME))
 471         {
 472           dump_type (TYPE_CONTEXT (t), flags);
 473           pp_cxx_colon_colon (cxx_pp);
 474         }
 475       pp_cxx_ws_string (cxx_pp, "template");
 476       dump_type (DECL_NAME (TYPE_NAME (t)), flags);
 477       break;
 478
 479     case TYPEOF_TYPE:
 480       pp_cxx_ws_string (cxx_pp, "__typeof__");
 481       pp_cxx_whitespace (cxx_pp);
 482       pp_cxx_left_paren (cxx_pp);
 483       dump_expr (TYPEOF_TYPE_EXPR (t), flags & ~TFF_EXPR_IN_PARENS);
 484       pp_cxx_right_paren (cxx_pp);
 485       break;
 486
 487     case TYPE_PACK_EXPANSION:
 488       dump_type (PACK_EXPANSION_PATTERN (t), flags);
 489       pp_cxx_ws_string (cxx_pp, "...");
 490       break;
 491
 492     case TYPE_ARGUMENT_PACK:
 493       dump_template_argument (t, flags);
 494       break;
 495
 496     case DECLTYPE_TYPE:
 497       pp_cxx_ws_string (cxx_pp, "decltype");
 498       pp_cxx_whitespace (cxx_pp);
 499       pp_cxx_left_paren (cxx_pp);
 500       dump_expr (DECLTYPE_TYPE_EXPR (t), flags & ~TFF_EXPR_IN_PARENS);
 501       pp_cxx_right_paren (cxx_pp);
 502       break;
 503
 504     case NULLPTR_TYPE:
 505       pp_string (cxx_pp, "std::nullptr_t");
 506       break;
 507
 508     default:
 509       pp_unsupported_tree (cxx_pp, t);
 510       /* Fall through to error.  */
 511
 512     case ERROR_MARK:
 513       pp_string (cxx_pp, M_("<type error>"));
 514       break;
 515     }
 516 }
 517
 518 /* Dump a TYPENAME_TYPE. We need to notice when the context is itself
 519    a TYPENAME_TYPE.  */
 520
 521 static void
 522 dump_typename (tree t, int flags)
 523 {
 524   tree ctx = TYPE_CONTEXT (t);
 525
 526   if (TREE_CODE (ctx) == TYPENAME_TYPE)
 527     dump_typename (ctx, flags);
 528   else
 529     dump_type (ctx, flags & ~TFF_CLASS_KEY_OR_ENUM);
 530   pp_cxx_colon_colon (cxx_pp);
 531   dump_decl (TYPENAME_TYPE_FULLNAME (t), flags);
 532 }
 533
 534 /* Return the name of the supplied aggregate, or enumeral type.  */
 535
 536 const char *
 537 class_key_or_enum_as_string (tree t)
 538 {
 539   if (TREE_CODE (t) == ENUMERAL_TYPE)
 540     {
 541       if (SCOPED_ENUM_P (t))
 542         return "enum class";
 543       else
 544         return "enum";
 545     }
 546   else if (TREE_CODE (t) == UNION_TYPE)
 547     return "union";
 548   else if (TYPE_LANG_SPECIFIC (t) && CLASSTYPE_DECLARED_CLASS (t))
 549     return "class";
 550   else
 551     return "struct";
 552 }
 553
 554 /* Print out a class declaration T under the control of FLAGS,
 555    in the form `class foo'.  */
 556
 557 static void
 558 dump_aggr_type (tree t, int flags)
 559 {
 560   tree name;
 561   const char *variety = class_key_or_enum_as_string (t);
 562   int typdef = 0;
 563   int tmplate = 0;
 564
 565   pp_cxx_cv_qualifier_seq (cxx_pp, t);
 566
 567   if (flags & TFF_CLASS_KEY_OR_ENUM)
 568     pp_cxx_ws_string (cxx_pp, variety);
 569
 570   name = TYPE_NAME (t);
 571
 572   if (name)
 573     {
 574       typdef = !DECL_ARTIFICIAL (name);
 575
 576       if ((typdef
 577            && ((flags & TFF_CHASE_TYPEDEF)
 578                || (!flag_pretty_templates && DECL_LANG_SPECIFIC (name)
 579                    && DECL_TEMPLATE_INFO (name))))
 580           || DECL_SELF_REFERENCE_P (name))
 581         {
 582           t = TYPE_MAIN_VARIANT (t);
 583           name = TYPE_NAME (t);
 584           typdef = 0;
 585         }
 586
 587       tmplate = !typdef && TREE_CODE (t) != ENUMERAL_TYPE
 588                 && TYPE_LANG_SPECIFIC (t) && CLASSTYPE_TEMPLATE_INFO (t)
 589                 && (TREE_CODE (CLASSTYPE_TI_TEMPLATE (t)) != TEMPLATE_DECL
 590                     || PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)));
 591
 592       if (! (flags & TFF_UNQUALIFIED_NAME))
 593         dump_scope (CP_DECL_CONTEXT (name), flags | TFF_SCOPE);
 594       flags &= ~TFF_UNQUALIFIED_NAME;
 595       if (tmplate)
 596         {
 597           /* Because the template names are mangled, we have to locate
 598              the most general template, and use that name.  */
 599           tree tpl = CLASSTYPE_TI_TEMPLATE (t);
 600
 601           while (DECL_TEMPLATE_INFO (tpl))
 602             tpl = DECL_TI_TEMPLATE (tpl);
 603           name = tpl;
 604         }
 605       name = DECL_NAME (name);
 606     }
 607
 608   if (name == 0 || ANON_AGGRNAME_P (name))
 609     {
 610       if (flags & TFF_CLASS_KEY_OR_ENUM)
 611         pp_string (cxx_pp, M_("<anonymous>"));
 612       else
 613         pp_printf (pp_base (cxx_pp), M_("<anonymous %s>"), variety);
 614     }
 615   else if (LAMBDANAME_P (name))
 616     {
 617       /* A lambda's "type" is essentially its signature.  */
 618       pp_string (cxx_pp, M_("<lambda"));
 619       if (lambda_function (t))
 620         dump_parameters (FUNCTION_FIRST_USER_PARMTYPE (lambda_function (t)),
 621                          flags);
 622       pp_character(cxx_pp, '>');
 623     }
 624   else
 625     pp_cxx_tree_identifier (cxx_pp, name);
 626   if (tmplate)
 627     dump_template_parms (TYPE_TEMPLATE_INFO (t),
 628                          !CLASSTYPE_USE_TEMPLATE (t),
 629                          flags & ~TFF_TEMPLATE_HEADER);
 630 }
 631
 632 /* Dump into the obstack the initial part of the output for a given type.
 633    This is necessary when dealing with things like functions returning
 634    functions.  Examples:
 635
 636    return type of `int (* fee ())()': pointer -> function -> int.  Both
 637    pointer (and reference and offset) and function (and member) types must
 638    deal with prefix and suffix.
 639
 640    Arrays must also do this for DECL nodes, like int a[], and for things like
 641    int *[]&.  */
 642
 643 static void
 644 dump_type_prefix (tree t, int flags)
 645 {
 646   if (TYPE_PTRMEMFUNC_P (t))
 647     {
 648       t = TYPE_PTRMEMFUNC_FN_TYPE (t);
 649       goto offset_type;
 650     }
 651
 652   switch (TREE_CODE (t))
 653     {
 654     case POINTER_TYPE:
 655     case REFERENCE_TYPE:
 656       {
 657         tree sub = TREE_TYPE (t);
 658
 659         dump_type_prefix (sub, flags);
 660         if (TREE_CODE (sub) == ARRAY_TYPE
 661             || TREE_CODE (sub) == FUNCTION_TYPE)
 662           {
 663             pp_cxx_whitespace (cxx_pp);
 664             pp_cxx_left_paren (cxx_pp);
 665           }
 666         if (TREE_CODE (t) == POINTER_TYPE)
 667           pp_character(cxx_pp, '*');
 668         else if (TREE_CODE (t) == REFERENCE_TYPE)
 669         {
 670           if (TYPE_REF_IS_RVALUE (t))
 671             pp_string (cxx_pp, "&&");
 672           else
 673             pp_character (cxx_pp, '&');
 674         }
 675         pp_base (cxx_pp)->padding = pp_before;
 676         pp_cxx_cv_qualifier_seq (cxx_pp, t);
 677       }
 678       break;
 679
 680     case OFFSET_TYPE:
 681     offset_type:
 682       dump_type_prefix (TREE_TYPE (t), flags);
 683       if (TREE_CODE (t) == OFFSET_TYPE) /* pmfs deal with this in d_t_p */
 684         {
 685           pp_maybe_space (cxx_pp);
 686           if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
 687              pp_cxx_left_paren (cxx_pp);
 688           dump_type (TYPE_OFFSET_BASETYPE (t), flags);
 689           pp_cxx_colon_colon (cxx_pp);
 690         }
 691       pp_cxx_star (cxx_pp);
 692       pp_cxx_cv_qualifier_seq (cxx_pp, t);
 693       pp_base (cxx_pp)->padding = pp_before;
 694       break;
 695
 696       /* This can be reached without a pointer when dealing with
 697          templates, e.g. std::is_function.  */
 698     case FUNCTION_TYPE:
 699       dump_type_prefix (TREE_TYPE (t), flags);
 700       break;
 701
 702     case METHOD_TYPE:
 703       dump_type_prefix (TREE_TYPE (t), flags);
 704       pp_maybe_space (cxx_pp);
 705       pp_cxx_left_paren (cxx_pp);
 706       dump_aggr_type (TYPE_METHOD_BASETYPE (t), flags);
 707       pp_cxx_colon_colon (cxx_pp);
 708       break;
 709
 710     case ARRAY_TYPE:
 711       dump_type_prefix (TREE_TYPE (t), flags);
 712       break;
 713
 714     case ENUMERAL_TYPE:
 715     case IDENTIFIER_NODE:
 716     case INTEGER_TYPE:
 717     case BOOLEAN_TYPE:
 718     case REAL_TYPE:
 719     case RECORD_TYPE:
 720     case TEMPLATE_TYPE_PARM:
 721     case TEMPLATE_TEMPLATE_PARM:
 722     case BOUND_TEMPLATE_TEMPLATE_PARM:
 723     case TREE_LIST:
 724     case TYPE_DECL:
 725     case TREE_VEC:
 726     case UNION_TYPE:
 727     case LANG_TYPE:
 728     case VOID_TYPE:
 729     case TYPENAME_TYPE:
 730     case COMPLEX_TYPE:
 731     case VECTOR_TYPE:
 732     case TYPEOF_TYPE:
 733     case DECLTYPE_TYPE:
 734     case TYPE_PACK_EXPANSION:
 735     case FIXED_POINT_TYPE:
 736     case NULLPTR_TYPE:
 737       dump_type (t, flags);
 738       pp_base (cxx_pp)->padding = pp_before;
 739       break;
 740
 741     default:
 742       pp_unsupported_tree (cxx_pp, t);
 743       /* fall through.  */
 744     case ERROR_MARK:
 745       pp_string (cxx_pp, M_("<typeprefixerror>"));
 746       break;
 747     }
 748 }
 749
 750 /* Dump the suffix of type T, under control of FLAGS.  This is the part
 751    which appears after the identifier (or function parms).  */
 752
 753 static void
 754 dump_type_suffix (tree t, int flags)
 755 {
 756   if (TYPE_PTRMEMFUNC_P (t))
 757     t = TYPE_PTRMEMFUNC_FN_TYPE (t);
 758
 759   switch (TREE_CODE (t))
 760     {
 761     case POINTER_TYPE:
 762     case REFERENCE_TYPE:
 763     case OFFSET_TYPE:
 764       if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE
 765           || TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE)
 766         pp_cxx_right_paren (cxx_pp);
 767       dump_type_suffix (TREE_TYPE (t), flags);
 768       break;
 769
 770     case FUNCTION_TYPE:
 771     case METHOD_TYPE:
 772       {
 773         tree arg;
 774         if (TREE_CODE (t) == METHOD_TYPE)
 775           /* Can only be reached through a pointer.  */
 776           pp_cxx_right_paren (cxx_pp);
 777         arg = TYPE_ARG_TYPES (t);
 778         if (TREE_CODE (t) == METHOD_TYPE)
 779           arg = TREE_CHAIN (arg);
 780
 781         /* Function pointers don't have default args.  Not in standard C++,
 782            anyway; they may in g++, but we'll just pretend otherwise.  */
 783         dump_parameters (arg, flags & ~TFF_FUNCTION_DEFAULT_ARGUMENTS);
 784
 785         if (TREE_CODE (t) == METHOD_TYPE)
 786           pp_cxx_cv_qualifier_seq
 787             (cxx_pp, TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (t))));
 788         else
 789           pp_cxx_cv_qualifier_seq (cxx_pp, t);
 790         dump_exception_spec (TYPE_RAISES_EXCEPTIONS (t), flags);
 791         dump_type_suffix (TREE_TYPE (t), flags);
 792         break;
 793       }
 794
 795     case ARRAY_TYPE:
 796       pp_maybe_space (cxx_pp);
 797       pp_cxx_left_bracket (cxx_pp);
 798       if (TYPE_DOMAIN (t))
 799         {
 800           tree dtype = TYPE_DOMAIN (t);
 801           tree max = TYPE_MAX_VALUE (dtype);
 802           if (host_integerp (max, 0))
 803             pp_wide_integer (cxx_pp, tree_low_cst (max, 0) + 1);
 804           else if (TREE_CODE (max) == MINUS_EXPR)
 805             dump_expr (TREE_OPERAND (max, 0),
 806                        flags & ~TFF_EXPR_IN_PARENS);
 807           else
 808             dump_expr (fold_build2_loc (input_location,
 809                                     PLUS_EXPR, dtype, max,
 810                                     build_int_cst (dtype, 1)),
 811                        flags & ~TFF_EXPR_IN_PARENS);
 812         }
 813       pp_cxx_right_bracket (cxx_pp);
 814       dump_type_suffix (TREE_TYPE (t), flags);
 815       break;
 816
 817     case ENUMERAL_TYPE:
 818     case IDENTIFIER_NODE:
 819     case INTEGER_TYPE:
 820     case BOOLEAN_TYPE:
 821     case REAL_TYPE:
 822     case RECORD_TYPE:
 823     case TEMPLATE_TYPE_PARM:
 824     case TEMPLATE_TEMPLATE_PARM:
 825     case BOUND_TEMPLATE_TEMPLATE_PARM:
 826     case TREE_LIST:
 827     case TYPE_DECL:
 828     case TREE_VEC:
 829     case UNION_TYPE:
 830     case LANG_TYPE:
 831     case VOID_TYPE:
 832     case TYPENAME_TYPE:
 833     case COMPLEX_TYPE:
 834     case VECTOR_TYPE:
 835     case TYPEOF_TYPE:
 836     case DECLTYPE_TYPE:
 837     case TYPE_PACK_EXPANSION:
 838     case FIXED_POINT_TYPE:
 839     case NULLPTR_TYPE:
 840       break;
 841
 842     default:
 843       pp_unsupported_tree (cxx_pp, t);
 844     case ERROR_MARK:
 845       /* Don't mark it here, we should have already done in
 846          dump_type_prefix.  */
 847       break;
 848     }
 849 }
 850
 851 static void
 852 dump_global_iord (tree t)
 853 {
 854   const char *p = NULL;
 855
 856   if (DECL_GLOBAL_CTOR_P (t))
 857     p = M_("(static initializers for %s)");
 858   else if (DECL_GLOBAL_DTOR_P (t))
 859     p = M_("(static destructors for %s)");
 860   else
 861     gcc_unreachable ();
 862
 863   pp_printf (pp_base (cxx_pp), p, input_filename);
 864 }
 865
 866 static void
 867 dump_simple_decl (tree t, tree type, int flags)
 868 {
 869   if (flags & TFF_DECL_SPECIFIERS)
 870     {
 871       if (TREE_CODE (t) == VAR_DECL
 872           && DECL_DECLARED_CONSTEXPR_P (t))
 873         pp_cxx_ws_string (cxx_pp, "constexpr");
 874       dump_type_prefix (type, flags & ~TFF_UNQUALIFIED_NAME);
 875       pp_maybe_space (cxx_pp);
 876     }
 877   if (! (flags & TFF_UNQUALIFIED_NAME)
 878       && TREE_CODE (t) != PARM_DECL
 879       && (!DECL_INITIAL (t)
 880           || TREE_CODE (DECL_INITIAL (t)) != TEMPLATE_PARM_INDEX))
 881     dump_scope (CP_DECL_CONTEXT (t), flags);
 882   flags &= ~TFF_UNQUALIFIED_NAME;
 883   if ((flags & TFF_DECL_SPECIFIERS)
 884       && DECL_TEMPLATE_PARM_P (t)
 885       && TEMPLATE_PARM_PARAMETER_PACK (DECL_INITIAL (t)))
 886     pp_string (cxx_pp, "...");
 887   if (DECL_NAME (t))
 888     dump_decl (DECL_NAME (t), flags);
 889   else
 890     pp_string (cxx_pp, M_("<anonymous>"));
 891   if (flags & TFF_DECL_SPECIFIERS)
 892     dump_type_suffix (type, flags);
 893 }
 894
 895 /* Dump a human readable string for the decl T under control of FLAGS.  */
 896
 897 static void
 898 dump_decl (tree t, int flags)
 899 {
 900   if (t == NULL_TREE)
 901     return;
 902
 903   /* If doing Objective-C++, give Objective-C a chance to demangle
 904      Objective-C method names.  */
 905   if (c_dialect_objc ())
 906     {
 907       const char *demangled = objc_maybe_printable_name (t, flags);
 908       if (demangled)
 909         {
 910           pp_string (cxx_pp, demangled);
 911           return;
 912         }
 913     }
 914
 915   switch (TREE_CODE (t))
 916     {
 917     case TYPE_DECL:
 918       /* Don't say 'typedef class A' */
 919       if (DECL_ARTIFICIAL (t) && !DECL_SELF_REFERENCE_P (t))
 920         {
 921           if ((flags & TFF_DECL_SPECIFIERS)
 922               && TREE_CODE (TREE_TYPE (t)) == TEMPLATE_TYPE_PARM)
 923             {
 924               /* Say `class T' not just `T'.  */
 925               pp_cxx_ws_string (cxx_pp, "class");
 926
 927               /* Emit the `...' for a parameter pack.  */
 928               if (TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (t)))
 929                 pp_cxx_ws_string (cxx_pp, "...");
 930             }
 931
 932           dump_type (TREE_TYPE (t), flags);
 933           break;
 934         }
 935       if ((flags & TFF_DECL_SPECIFIERS)
 936           && !DECL_SELF_REFERENCE_P (t))
 937         pp_cxx_ws_string (cxx_pp, "typedef");
 938       dump_simple_decl (t, DECL_ORIGINAL_TYPE (t)
 939                         ? DECL_ORIGINAL_TYPE (t) : TREE_TYPE (t),
 940                         flags);
 941       break;
 942
 943     case VAR_DECL:
 944       if (DECL_NAME (t) && VTABLE_NAME_P (DECL_NAME (t)))
 945         {
 946           pp_string (cxx_pp, M_("vtable for "));
 947           gcc_assert (TYPE_P (DECL_CONTEXT (t)));
 948           dump_type (DECL_CONTEXT (t), flags);
 949           break;
 950         }
 951       /* Else fall through.  */
 952     case FIELD_DECL:
 953     case PARM_DECL:
 954       dump_simple_decl (t, TREE_TYPE (t), flags);
 955       break;
 956
 957     case RESULT_DECL:
 958       pp_string (cxx_pp, M_("<return value> "));
 959       dump_simple_decl (t, TREE_TYPE (t), flags);
 960       break;
 961
 962     case NAMESPACE_DECL:
 963       if (flags & TFF_DECL_SPECIFIERS)
 964         pp_cxx_declaration (cxx_pp, t);
 965       else
 966         {
 967           if (! (flags & TFF_UNQUALIFIED_NAME))
 968             dump_scope (CP_DECL_CONTEXT (t), flags);
 969           flags &= ~TFF_UNQUALIFIED_NAME;
 970           if (DECL_NAME (t) == NULL_TREE)
 971             pp_cxx_ws_string (cxx_pp, M_("{anonymous}"));
 972           else
 973             pp_cxx_tree_identifier (cxx_pp, DECL_NAME (t));
 974         }
 975       break;
 976
 977     case SCOPE_REF:
 978       dump_type (TREE_OPERAND (t, 0), flags);
 979       pp_string (cxx_pp, "::");
 980       dump_decl (TREE_OPERAND (t, 1), flags|TFF_UNQUALIFIED_NAME);
 981       break;
 982
 983     case ARRAY_REF:
 984       dump_decl (TREE_OPERAND (t, 0), flags);
 985       pp_cxx_left_bracket (cxx_pp);
 986       dump_decl (TREE_OPERAND (t, 1), flags);
 987       pp_cxx_right_bracket (cxx_pp);
 988       break;
 989
 990       /* So that we can do dump_decl on an aggr type.  */
 991     case RECORD_TYPE:
 992     case UNION_TYPE:
 993     case ENUMERAL_TYPE:
 994       dump_type (t, flags);
 995       break;
 996
 997     case BIT_NOT_EXPR:
 998       /* This is a pseudo destructor call which has not been folded into
 999          a PSEUDO_DTOR_EXPR yet.  */
1000       pp_cxx_complement (cxx_pp);
1001       dump_type (TREE_OPERAND (t, 0), flags);
1002       break;
1003
1004     case TYPE_EXPR:
1005       gcc_unreachable ();
1006       break;
1007
1008       /* These special cases are duplicated here so that other functions
1009          can feed identifiers to error and get them demangled properly.  */
1010     case IDENTIFIER_NODE:
1011       if (IDENTIFIER_TYPENAME_P (t))
1012         {
1013           pp_cxx_ws_string (cxx_pp, "operator");
1014           /* Not exactly IDENTIFIER_TYPE_VALUE.  */
1015           dump_type (TREE_TYPE (t), flags);
1016           break;
1017         }
1018       else
1019         pp_cxx_tree_identifier (cxx_pp, t);
1020       break;
1021
1022     case OVERLOAD:
1023       if (OVL_CHAIN (t))
1024         {
1025           t = OVL_CURRENT (t);
1026           if (DECL_CLASS_SCOPE_P (t))
1027             {
1028               dump_type (DECL_CONTEXT (t), flags);
1029               pp_cxx_colon_colon (cxx_pp);
1030             }
1031           else if (DECL_CONTEXT (t))
1032             {
1033               dump_decl (DECL_CONTEXT (t), flags);
1034               pp_cxx_colon_colon (cxx_pp);
1035             }
1036           dump_decl (DECL_NAME (t), flags);
1037           break;
1038         }
1039
1040       /* If there's only one function, just treat it like an ordinary
1041          FUNCTION_DECL.  */
1042       t = OVL_CURRENT (t);
1043       /* Fall through.  */
1044
1045     case FUNCTION_DECL:
1046       if (! DECL_LANG_SPECIFIC (t))
1047         pp_string (cxx_pp, M_("<built-in>"));
1048       else if (DECL_GLOBAL_CTOR_P (t) || DECL_GLOBAL_DTOR_P (t))
1049         dump_global_iord (t);
1050       else
1051         dump_function_decl (t, flags);
1052       break;
1053
1054     case TEMPLATE_DECL:
1055       dump_template_decl (t, flags);
1056       break;
1057
1058     case TEMPLATE_ID_EXPR:
1059       {
1060         tree name = TREE_OPERAND (t, 0);
1061
1062         if (is_overloaded_fn (name))
1063           name = DECL_NAME (get_first_fn (name));
1064         dump_decl (name, flags);
1065         pp_cxx_begin_template_argument_list (cxx_pp);
1066         if (TREE_OPERAND (t, 1))
1067           dump_template_argument_list (TREE_OPERAND (t, 1), flags);
1068         pp_cxx_end_template_argument_list (cxx_pp);
1069       }
1070       break;
1071
1072     case LABEL_DECL:
1073       pp_cxx_tree_identifier (cxx_pp, DECL_NAME (t));
1074       break;
1075
1076     case CONST_DECL:
1077       if ((TREE_TYPE (t) != NULL_TREE && NEXT_CODE (t) == ENUMERAL_TYPE)
1078           || (DECL_INITIAL (t) &&
1079               TREE_CODE (DECL_INITIAL (t)) == TEMPLATE_PARM_INDEX))
1080         dump_simple_decl (t, TREE_TYPE (t), flags);
1081       else if (DECL_NAME (t))
1082         dump_decl (DECL_NAME (t), flags);
1083       else if (DECL_INITIAL (t))
1084         dump_expr (DECL_INITIAL (t), flags | TFF_EXPR_IN_PARENS);
1085       else
1086         pp_string (cxx_pp, M_("<enumerator>"));
1087       break;
1088
1089     case USING_DECL:
1090       pp_cxx_ws_string (cxx_pp, "using");
1091       dump_type (USING_DECL_SCOPE (t), flags);
1092       pp_cxx_colon_colon (cxx_pp);
1093       dump_decl (DECL_NAME (t), flags);
1094       break;
1095
1096     case STATIC_ASSERT:
1097       pp_cxx_declaration (cxx_pp, t);
1098       break;
1099
1100     case BASELINK:
1101       dump_decl (BASELINK_FUNCTIONS (t), flags);
1102       break;
1103
1104     case NON_DEPENDENT_EXPR:
1105       dump_expr (t, flags);
1106       break;
1107
1108     case TEMPLATE_TYPE_PARM:
1109       if (flags & TFF_DECL_SPECIFIERS)
1110         pp_cxx_declaration (cxx_pp, t);
1111       else
1112         pp_type_id (cxx_pp, t);
1113       break;
1114
1115     case UNBOUND_CLASS_TEMPLATE:
1116     case TYPE_PACK_EXPANSION:
1117     case TREE_BINFO:
1118       dump_type (t, flags);
1119       break;
1120
1121     default:
1122       pp_unsupported_tree (cxx_pp, t);
1123       /* Fall through to error.  */
1124
1125     case ERROR_MARK:
1126       pp_string (cxx_pp, M_("<declaration error>"));
1127       break;
1128     }
1129 }
1130
1131 /* Dump a template declaration T under control of FLAGS. This means the
1132    'template <...> leaders plus the 'class X' or 'void fn(...)' part.  */
1133
1134 static void
1135 dump_template_decl (tree t, int flags)
1136 {
1137   tree orig_parms = DECL_TEMPLATE_PARMS (t);
1138   tree parms;
1139   int i;
1140
1141   if (flags & TFF_TEMPLATE_HEADER)
1142     {
1143       for (parms = orig_parms = nreverse (orig_parms);
1144            parms;
1145            parms = TREE_CHAIN (parms))
1146         {
1147           tree inner_parms = INNERMOST_TEMPLATE_PARMS (parms);
1148           int len = TREE_VEC_LENGTH (inner_parms);
1149
1150           pp_cxx_ws_string (cxx_pp, "template");
1151           pp_cxx_begin_template_argument_list (cxx_pp);
1152
1153           /* If we've shown the template prefix, we'd better show the
1154              parameters' and decl's type too.  */
1155             flags |= TFF_DECL_SPECIFIERS;
1156
1157           for (i = 0; i < len; i++)
1158             {
1159               if (i)
1160                 pp_separate_with_comma (cxx_pp);
1161               dump_template_parameter (TREE_VEC_ELT (inner_parms, i), flags);
1162             }
1163           pp_cxx_end_template_argument_list (cxx_pp);
1164           pp_cxx_whitespace (cxx_pp);
1165         }
1166       nreverse(orig_parms);
1167
1168       if (DECL_TEMPLATE_TEMPLATE_PARM_P (t))
1169         {
1170           /* Say `template<arg> class TT' not just `template<arg> TT'.  */
1171           pp_cxx_ws_string (cxx_pp, "class");
1172
1173           /* If this is a parameter pack, print the ellipsis.  */
1174           if (TEMPLATE_TYPE_PARAMETER_PACK (TREE_TYPE (t)))
1175             pp_cxx_ws_string (cxx_pp, "...");
1176         }
1177     }
1178
1179   if (DECL_TEMPLATE_RESULT (t)
1180       && TREE_CODE (DECL_TEMPLATE_RESULT (t)) == TYPE_DECL)
1181     dump_type (TREE_TYPE (t),
1182                ((flags & ~TFF_CLASS_KEY_OR_ENUM) | TFF_TEMPLATE_NAME
1183                 | (flags & TFF_DECL_SPECIFIERS ? TFF_CLASS_KEY_OR_ENUM : 0)));
1184   else if (DECL_TEMPLATE_RESULT (t)
1185            && TREE_CODE (DECL_TEMPLATE_RESULT (t)) == VAR_DECL)
1186     dump_decl (DECL_TEMPLATE_RESULT (t), flags | TFF_TEMPLATE_NAME);
1187   else
1188     {
1189       gcc_assert (TREE_TYPE (t));
1190       switch (NEXT_CODE (t))
1191         {
1192         case METHOD_TYPE:
1193         case FUNCTION_TYPE:
1194           dump_function_decl (t, flags | TFF_TEMPLATE_NAME);
1195           break;
1196         default:
1197           /* This case can occur with some invalid code.  */
1198           dump_type (TREE_TYPE (t),
1199                      (flags & ~TFF_CLASS_KEY_OR_ENUM) | TFF_TEMPLATE_NAME
1200                      | (flags & TFF_DECL_SPECIFIERS
1201                         ? TFF_CLASS_KEY_OR_ENUM : 0));
1202         }
1203     }
1204 }
1205
1206 /* find_typenames looks through the type of the function template T
1207    and returns a VEC containing any typedefs, decltypes or TYPENAME_TYPEs
1208    it finds.  */
1209
1210 struct find_typenames_t
1211 {
1212   struct pointer_set_t *p_set;
1213   VEC (tree,gc) *typenames;
1214 };
1215
1216 static tree
1217 find_typenames_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED, void *data)
1218 {
1219   struct find_typenames_t *d = (struct find_typenames_t *)data;
1220   tree mv = NULL_TREE;
1221
1222   if (TYPE_P (*tp) && is_typedef_decl (TYPE_NAME (*tp)))
1223     /* Add the type of the typedef without any additional cv-quals.  */
1224     mv = TREE_TYPE (TYPE_NAME (*tp));
1225   else if (TREE_CODE (*tp) == TYPENAME_TYPE
1226            || TREE_CODE (*tp) == DECLTYPE_TYPE)
1227     /* Add the typename without any cv-qualifiers.  */
1228     mv = TYPE_MAIN_VARIANT (*tp);
1229
1230   if (mv && (mv == *tp || !pointer_set_insert (d->p_set, mv)))
1231     VEC_safe_push (tree, gc, d->typenames, mv);
1232
1233   /* Search into class template arguments, which cp_walk_subtrees
1234      doesn't do.  */
1235   if (CLASS_TYPE_P (*tp) && CLASSTYPE_TEMPLATE_INFO (*tp))
1236     cp_walk_tree (&CLASSTYPE_TI_ARGS (*tp), find_typenames_r,
1237                   data, d->p_set);
1238
1239   return NULL_TREE;
1240 }
1241
1242 static VEC(tree,gc) *
1243 find_typenames (tree t)
1244 {
1245   struct find_typenames_t ft;
1246   ft.p_set = pointer_set_create ();
1247   ft.typenames = NULL;
1248   cp_walk_tree (&TREE_TYPE (DECL_TEMPLATE_RESULT (t)),
1249                 find_typenames_r, &ft, ft.p_set);
1250   pointer_set_destroy (ft.p_set);
1251   return ft.typenames;
1252 }
1253
1254 /* Pretty print a function decl. There are several ways we want to print a
1255    function declaration. The TFF_ bits in FLAGS tells us how to behave.
1256    As error can only apply the '#' flag once to give 0 and 1 for V, there
1257    is %D which doesn't print the throw specs, and %F which does.  */
1258
1259 static void
1260 dump_function_decl (tree t, int flags)
1261 {
1262   tree fntype;
1263   tree parmtypes;
1264   tree cname = NULL_TREE;
1265   tree template_args = NULL_TREE;
1266   tree template_parms = NULL_TREE;
1267   int show_return = flags & TFF_RETURN_TYPE || flags & TFF_DECL_SPECIFIERS;
1268   int do_outer_scope = ! (flags & TFF_UNQUALIFIED_NAME);
1269   tree exceptions;
1270   VEC(tree,gc) *typenames = NULL;
1271
1272   if (DECL_NAME (t) && LAMBDA_FUNCTION_P (t))
1273     {
1274       /* A lambda's signature is essentially its "type", so defer.  */
1275       gcc_assert (LAMBDA_TYPE_P (DECL_CONTEXT (t)));
1276       dump_type (DECL_CONTEXT (t), flags);
1277       return;
1278     }
1279
1280   flags &= ~TFF_UNQUALIFIED_NAME;
1281   if (TREE_CODE (t) == TEMPLATE_DECL)
1282     t = DECL_TEMPLATE_RESULT (t);
1283
1284   /* Save the exceptions, in case t is a specialization and we are
1285      emitting an error about incompatible specifications.  */
1286   exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (t));
1287
1288   /* Pretty print template instantiations only.  */
1289   if (DECL_USE_TEMPLATE (t) && DECL_TEMPLATE_INFO (t)
1290       && flag_pretty_templates)
1291     {
1292       tree tmpl;
1293
1294       template_args = DECL_TI_ARGS (t);
1295       tmpl = most_general_template (t);
1296       if (tmpl && TREE_CODE (tmpl) == TEMPLATE_DECL)
1297         {
1298           template_parms = DECL_TEMPLATE_PARMS (tmpl);
1299           t = tmpl;
1300           typenames = find_typenames (t);
1301         }
1302     }
1303
1304   fntype = TREE_TYPE (t);
1305   parmtypes = FUNCTION_FIRST_USER_PARMTYPE (t);
1306
1307   if (DECL_CLASS_SCOPE_P (t))
1308     cname = DECL_CONTEXT (t);
1309   /* This is for partially instantiated template methods.  */
1310   else if (TREE_CODE (fntype) == METHOD_TYPE)
1311     cname = TREE_TYPE (TREE_VALUE (parmtypes));
1312
1313   if (flags & TFF_DECL_SPECIFIERS)
1314     {
1315       if (DECL_STATIC_FUNCTION_P (t))
1316         pp_cxx_ws_string (cxx_pp, "static");
1317       else if (DECL_VIRTUAL_P (t))
1318         pp_cxx_ws_string (cxx_pp, "virtual");
1319
1320       if (DECL_DECLARED_CONSTEXPR_P (STRIP_TEMPLATE (t)))
1321         pp_cxx_ws_string (cxx_pp, "constexpr");
1322     }
1323
1324   /* Print the return type?  */
1325   if (show_return)
1326     show_return = !DECL_CONV_FN_P (t)  && !DECL_CONSTRUCTOR_P (t)
1327                   && !DECL_DESTRUCTOR_P (t);
1328   if (show_return)
1329     dump_type_prefix (TREE_TYPE (fntype), flags);
1330
1331   /* Print the function name.  */
1332   if (!do_outer_scope)
1333     /* Nothing.  */;
1334   else if (cname)
1335     {
1336       dump_type (cname, flags);
1337       pp_cxx_colon_colon (cxx_pp);
1338     }
1339   else
1340     dump_scope (CP_DECL_CONTEXT (t), flags);
1341
1342   dump_function_name (t, flags);
1343
1344   if (!(flags & TFF_NO_FUNCTION_ARGUMENTS))
1345     {
1346       dump_parameters (parmtypes, flags);
1347
1348       if (TREE_CODE (fntype) == METHOD_TYPE)
1349         {
1350           pp_base (cxx_pp)->padding = pp_before;
1351           pp_cxx_cv_qualifier_seq
1352             (cxx_pp, TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype))));
1353         }
1354
1355       if (flags & TFF_EXCEPTION_SPECIFICATION)
1356         {
1357           pp_base (cxx_pp)->padding = pp_before;
1358           dump_exception_spec (exceptions, flags);
1359         }
1360
1361       if (show_return)
1362         dump_type_suffix (TREE_TYPE (fntype), flags);
1363     }
1364
1365   /* If T is a template instantiation, dump the parameter binding.  */
1366   if (template_parms != NULL_TREE && template_args != NULL_TREE)
1367     {
1368       pp_cxx_whitespace (cxx_pp);
1369       pp_cxx_left_bracket (cxx_pp);
1370       pp_cxx_ws_string (cxx_pp, M_("with"));
1371       pp_cxx_whitespace (cxx_pp);
1372       dump_template_bindings (template_parms, template_args, typenames);
1373       pp_cxx_right_bracket (cxx_pp);
1374     }
1375 }
1376
1377 /* Print a parameter list. If this is for a member function, the
1378    member object ptr (and any other hidden args) should have
1379    already been removed.  */
1380
1381 static void
1382 dump_parameters (tree parmtypes, int flags)
1383 {
1384   int first = 1;
1385   flags &= ~TFF_SCOPE;
1386   pp_cxx_left_paren (cxx_pp);
1387
1388   for (first = 1; parmtypes != void_list_node;
1389        parmtypes = TREE_CHAIN (parmtypes))
1390     {
1391       if (!first)
1392         pp_separate_with_comma (cxx_pp);
1393       first = 0;
1394       if (!parmtypes)
1395         {
1396           pp_cxx_ws_string (cxx_pp, "...");
1397           break;
1398         }
1399
1400       dump_type (TREE_VALUE (parmtypes), flags);
1401
1402       if ((flags & TFF_FUNCTION_DEFAULT_ARGUMENTS) && TREE_PURPOSE (parmtypes))
1403         {
1404           pp_cxx_whitespace (cxx_pp);
1405           pp_equal (cxx_pp);
1406           pp_cxx_whitespace (cxx_pp);
1407           dump_expr (TREE_PURPOSE (parmtypes), flags | TFF_EXPR_IN_PARENS);
1408         }
1409     }
1410
1411   pp_cxx_right_paren (cxx_pp);
1412 }
1413
1414 /* Print an exception specification. T is the exception specification.  */
1415
1416 static void
1417 dump_exception_spec (tree t, int flags)
1418 {
1419   if (t && TREE_PURPOSE (t))
1420     {
1421       pp_cxx_ws_string (cxx_pp, "noexcept");
1422       pp_cxx_whitespace (cxx_pp);
1423       pp_cxx_left_paren (cxx_pp);
1424       dump_expr (TREE_PURPOSE (t), flags);
1425       pp_cxx_right_paren (cxx_pp);
1426     }
1427   else if (t)
1428     {
1429       pp_cxx_ws_string (cxx_pp, "throw");
1430       pp_cxx_whitespace (cxx_pp);
1431       pp_cxx_left_paren (cxx_pp);
1432       if (TREE_VALUE (t) != NULL_TREE)
1433         while (1)
1434           {
1435             dump_type (TREE_VALUE (t), flags);
1436             t = TREE_CHAIN (t);
1437             if (!t)
1438               break;
1439             pp_separate_with_comma (cxx_pp);
1440           }
1441       pp_cxx_right_paren (cxx_pp);
1442     }
1443 }
1444
1445 /* Handle the function name for a FUNCTION_DECL node, grokking operators
1446    and destructors properly.  */
1447
1448 static void
1449 dump_function_name (tree t, int flags)
1450 {
1451   tree name = DECL_NAME (t);
1452
1453   /* We can get here with a decl that was synthesized by language-
1454      independent machinery (e.g. coverage.c) in which case it won't
1455      have a lang_specific structure attached and DECL_CONSTRUCTOR_P
1456      will crash.  In this case it is safe just to print out the
1457      literal name.  */
1458   if (!DECL_LANG_SPECIFIC (t))
1459     {
1460       pp_cxx_tree_identifier (cxx_pp, name);
1461       return;
1462     }
1463
1464   if (TREE_CODE (t) == TEMPLATE_DECL)
1465     t = DECL_TEMPLATE_RESULT (t);
1466
1467   /* Don't let the user see __comp_ctor et al.  */
1468   if (DECL_CONSTRUCTOR_P (t)
1469       || DECL_DESTRUCTOR_P (t))
1470     {
1471       if (LAMBDA_TYPE_P (DECL_CONTEXT (t)))
1472         name = get_identifier ("<lambda>");
1473       else
1474         name = constructor_name (DECL_CONTEXT (t));
1475     }
1476
1477   if (DECL_DESTRUCTOR_P (t))
1478     {
1479       pp_cxx_complement (cxx_pp);
1480       dump_decl (name, TFF_PLAIN_IDENTIFIER);
1481     }
1482   else if (DECL_CONV_FN_P (t))
1483     {
1484       /* This cannot use the hack that the operator's return
1485          type is stashed off of its name because it may be
1486          used for error reporting.  In the case of conflicting
1487          declarations, both will have the same name, yet
1488          the types will be different, hence the TREE_TYPE field
1489          of the first name will be clobbered by the second.  */
1490       pp_cxx_ws_string (cxx_pp, "operator");
1491       dump_type (TREE_TYPE (TREE_TYPE (t)), flags);
1492     }
1493   else if (name && IDENTIFIER_OPNAME_P (name))
1494     pp_cxx_tree_identifier (cxx_pp, name);
1495   else
1496     dump_decl (name, flags);
1497
1498   if (DECL_TEMPLATE_INFO (t)
1499       && !DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (t)
1500       && (TREE_CODE (DECL_TI_TEMPLATE (t)) != TEMPLATE_DECL
1501           || PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (t))))
1502     dump_template_parms (DECL_TEMPLATE_INFO (t), !DECL_USE_TEMPLATE (t), flags);
1503 }
1504
1505 /* Dump the template parameters from the template info INFO under control of
1506    FLAGS. PRIMARY indicates whether this is a primary template decl, or
1507    specialization (partial or complete). For partial specializations we show
1508    the specialized parameter values. For a primary template we show no
1509    decoration.  */
1510
1511 static void
1512 dump_template_parms (tree info, int primary, int flags)
1513 {
1514   tree args = info ? TI_ARGS (info) : NULL_TREE;
1515
1516   if (primary && flags & TFF_TEMPLATE_NAME)
1517     return;
1518   flags &= ~(TFF_CLASS_KEY_OR_ENUM | TFF_TEMPLATE_NAME);
1519   pp_cxx_begin_template_argument_list (cxx_pp);
1520
1521   /* Be careful only to print things when we have them, so as not
1522      to crash producing error messages.  */
1523   if (args && !primary)
1524     {
1525       int len, ix;
1526       len = get_non_default_template_args_count (args, flags);
1527
1528       args = INNERMOST_TEMPLATE_ARGS (args);
1529       for (ix = 0; ix != len; ix++)
1530         {
1531           tree arg = TREE_VEC_ELT (args, ix);
1532
1533           /* Only print a comma if we know there is an argument coming. In
1534              the case of an empty template argument pack, no actual
1535              argument will be printed.  */
1536           if (ix
1537               && (!ARGUMENT_PACK_P (arg)
1538                   || TREE_VEC_LENGTH (ARGUMENT_PACK_ARGS (arg)) > 0))
1539             pp_separate_with_comma (cxx_pp);
1540
1541           if (!arg)
1542             pp_string (cxx_pp, M_("<template parameter error>"));
1543           else
1544             dump_template_argument (arg, flags);
1545         }
1546     }
1547   else if (primary)
1548     {
1549       tree tpl = TI_TEMPLATE (info);
1550       tree parms = DECL_TEMPLATE_PARMS (tpl);
1551       int len, ix;
1552
1553       parms = TREE_CODE (parms) == TREE_LIST ? TREE_VALUE (parms) : NULL_TREE;
1554       len = parms ? TREE_VEC_LENGTH (parms) : 0;
1555
1556       for (ix = 0; ix != len; ix++)
1557         {
1558           tree parm;
1559
1560           if (TREE_VEC_ELT (parms, ix) == error_mark_node)
1561             {
1562               pp_string (cxx_pp, M_("<template parameter error>"));
1563               continue;
1564             }
1565
1566           parm = TREE_VALUE (TREE_VEC_ELT (parms, ix));
1567
1568           if (ix)
1569             pp_separate_with_comma (cxx_pp);
1570
1571           dump_decl (parm, flags & ~TFF_DECL_SPECIFIERS);
1572         }
1573     }
1574   pp_cxx_end_template_argument_list (cxx_pp);
1575 }
1576
1577 /* Print out the arguments of CALL_EXPR T as a parenthesized list using
1578    flags FLAGS.  Skip over the first argument if SKIPFIRST is true.  */
1579
1580 static void
1581 dump_call_expr_args (tree t, int flags, bool skipfirst)
1582 {
1583   tree arg;
1584   call_expr_arg_iterator iter;
1585
1586   pp_cxx_left_paren (cxx_pp);
1587   FOR_EACH_CALL_EXPR_ARG (arg, iter, t)
1588     {
1589       if (skipfirst)
1590         skipfirst = false;
1591       else
1592         {
1593           dump_expr (arg, flags | TFF_EXPR_IN_PARENS);
1594           if (more_call_expr_args_p (&iter))
1595             pp_separate_with_comma (cxx_pp);
1596         }
1597     }
1598   pp_cxx_right_paren (cxx_pp);
1599 }
1600
1601 /* Print out the arguments of AGGR_INIT_EXPR T as a parenthesized list
1602    using flags FLAGS.  Skip over the first argument if SKIPFIRST is
1603    true.  */
1604
1605 static void
1606 dump_aggr_init_expr_args (tree t, int flags, bool skipfirst)
1607 {
1608   tree arg;
1609   aggr_init_expr_arg_iterator iter;
1610
1611   pp_cxx_left_paren (cxx_pp);
1612   FOR_EACH_AGGR_INIT_EXPR_ARG (arg, iter, t)
1613     {
1614       if (skipfirst)
1615         skipfirst = false;
1616       else
1617         {
1618           dump_expr (arg, flags | TFF_EXPR_IN_PARENS);
1619           if (more_aggr_init_expr_args_p (&iter))
1620             pp_separate_with_comma (cxx_pp);
1621         }
1622     }
1623   pp_cxx_right_paren (cxx_pp);
1624 }
1625
1626 /* Print out a list of initializers (subr of dump_expr).  */
1627
1628 static void
1629 dump_expr_list (tree l, int flags)
1630 {
1631   while (l)
1632     {
1633       dump_expr (TREE_VALUE (l), flags | TFF_EXPR_IN_PARENS);
1634       l = TREE_CHAIN (l);
1635       if (l)
1636         pp_separate_with_comma (cxx_pp);
1637     }
1638 }
1639
1640 /* Print out a vector of initializers (subr of dump_expr).  */
1641
1642 static void
1643 dump_expr_init_vec (VEC(constructor_elt,gc) *v, int flags)
1644 {
1645   unsigned HOST_WIDE_INT idx;
1646   tree value;
1647
1648   FOR_EACH_CONSTRUCTOR_VALUE (v, idx, value)
1649     {
1650       dump_expr (value, flags | TFF_EXPR_IN_PARENS);
1651       if (idx != VEC_length (constructor_elt, v) - 1)
1652         pp_separate_with_comma (cxx_pp);
1653     }
1654 }
1655
1656
1657 /* We've gotten an indirect REFERENCE (an OBJ_TYPE_REF) to a virtual
1658    function.  Resolve it to a close relative -- in the sense of static
1659    type -- variant being overridden.  That is close to what was written in
1660    the source code.  Subroutine of dump_expr.  */
1661
1662 static tree
1663 resolve_virtual_fun_from_obj_type_ref (tree ref)
1664 {
1665   tree obj_type = TREE_TYPE (OBJ_TYPE_REF_OBJECT (ref));
1666   HOST_WIDE_INT index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1);
1667   tree fun = BINFO_VIRTUALS (TYPE_BINFO (TREE_TYPE (obj_type)));
1668   while (index)
1669     {
1670       fun = TREE_CHAIN (fun);
1671       index -= (TARGET_VTABLE_USES_DESCRIPTORS
1672                 ? TARGET_VTABLE_USES_DESCRIPTORS : 1);
1673     }
1674
1675   return BV_FN (fun);
1676 }
1677
1678 /* Print out an expression E under control of FLAGS.  */
1679
1680 static void
1681 dump_expr (tree t, int flags)
1682 {
1683   if (t == 0)
1684     return;
1685
1686   if (STATEMENT_CLASS_P (t))
1687     {
1688       pp_cxx_ws_string (cxx_pp, M_("<statement>"));
1689       return;
1690     }
1691
1692   switch (TREE_CODE (t))
1693     {
1694     case VAR_DECL:
1695     case PARM_DECL:
1696     case FIELD_DECL:
1697     case CONST_DECL:
1698     case FUNCTION_DECL:
1699     case TEMPLATE_DECL:
1700     case NAMESPACE_DECL:
1701     case LABEL_DECL:
1702     case OVERLOAD:
1703     case IDENTIFIER_NODE:
1704       dump_decl (t, (flags & ~TFF_DECL_SPECIFIERS) | TFF_NO_FUNCTION_ARGUMENTS);
1705       break;
1706
1707     case INTEGER_CST:
1708     case REAL_CST:
1709     case STRING_CST:
1710     case COMPLEX_CST:
1711       pp_constant (cxx_pp, t);
1712       break;
1713
1714     case THROW_EXPR:
1715       /* While waiting for caret diagnostics, avoid printing
1716          __cxa_allocate_exception, __cxa_throw, and the like.  */
1717       pp_cxx_ws_string (cxx_pp, M_("<throw-expression>"));
1718       break;
1719
1720     case PTRMEM_CST:
1721       pp_ampersand (cxx_pp);
1722       dump_type (PTRMEM_CST_CLASS (t), flags);
1723       pp_cxx_colon_colon (cxx_pp);
1724       pp_cxx_tree_identifier (cxx_pp, DECL_NAME (PTRMEM_CST_MEMBER (t)));
1725       break;
1726
1727     case COMPOUND_EXPR:
1728       pp_cxx_left_paren (cxx_pp);
1729       dump_expr (TREE_OPERAND (t, 0), flags | TFF_EXPR_IN_PARENS);
1730       pp_separate_with_comma (cxx_pp);
1731       dump_expr (TREE_OPERAND (t, 1), flags | TFF_EXPR_IN_PARENS);
1732       pp_cxx_right_paren (cxx_pp);
1733       break;
1734
1735     case COND_EXPR:
1736       pp_cxx_left_paren (cxx_pp);
1737       dump_expr (TREE_OPERAND (t, 0), flags | TFF_EXPR_IN_PARENS);
1738       pp_string (cxx_pp, " ? ");
1739       dump_expr (TREE_OPERAND (t, 1), flags | TFF_EXPR_IN_PARENS);
1740       pp_string (cxx_pp, " : ");
1741       dump_expr (TREE_OPERAND (t, 2), flags | TFF_EXPR_IN_PARENS);
1742       pp_cxx_right_paren (cxx_pp);
1743       break;
1744
1745     case SAVE_EXPR:
1746       if (TREE_HAS_CONSTRUCTOR (t))
1747         {
1748           pp_cxx_ws_string (cxx_pp, "new");
1749           pp_cxx_whitespace (cxx_pp);
1750           dump_type (TREE_TYPE (TREE_TYPE (t)), flags);
1751         }
1752       else
1753         dump_expr (TREE_OPERAND (t, 0), flags | TFF_EXPR_IN_PARENS);
1754       break;
1755
1756     case AGGR_INIT_EXPR:
1757       {
1758         tree fn = NULL_TREE;
1759
1760         if (TREE_CODE (AGGR_INIT_EXPR_FN (t)) == ADDR_EXPR)
1761           fn = TREE_OPERAND (AGGR_INIT_EXPR_FN (t), 0);
1762
1763         if (fn && TREE_CODE (fn) == FUNCTION_DECL)
1764           {
1765             if (DECL_CONSTRUCTOR_P (fn))
1766               dump_type (DECL_CONTEXT (fn), flags);
1767             else
1768               dump_decl (fn, 0);
1769           }
1770         else
1771           dump_expr (AGGR_INIT_EXPR_FN (t), 0);
1772       }
1773       dump_aggr_init_expr_args (t, flags, true);
1774       break;
1775
1776     case CALL_EXPR:
1777       {
1778         tree fn = CALL_EXPR_FN (t);
1779         bool skipfirst = false;
1780
1781         if (TREE_CODE (fn) == ADDR_EXPR)
1782           fn = TREE_OPERAND (fn, 0);
1783
1784         /* Nobody is interested in seeing the guts of vcalls.  */
1785         if (TREE_CODE (fn) == OBJ_TYPE_REF)
1786           fn = resolve_virtual_fun_from_obj_type_ref (fn);
1787
1788         if (TREE_TYPE (fn) != NULL_TREE
1789             && NEXT_CODE (fn) == METHOD_TYPE
1790             && call_expr_nargs (t))
1791           {
1792             tree ob = CALL_EXPR_ARG (t, 0);
1793             if (TREE_CODE (ob) == ADDR_EXPR)
1794               {
1795                 dump_expr (TREE_OPERAND (ob, 0), flags | TFF_EXPR_IN_PARENS);
1796                 pp_cxx_dot (cxx_pp);
1797               }
1798             else if (TREE_CODE (ob) != PARM_DECL
1799                      || strcmp (IDENTIFIER_POINTER (DECL_NAME (ob)), "this"))
1800               {
1801                 dump_expr (ob, flags | TFF_EXPR_IN_PARENS);
1802                 pp_cxx_arrow (cxx_pp);
1803               }
1804             skipfirst = true;
1805           }
1806         dump_expr (fn, flags | TFF_EXPR_IN_PARENS);
1807         dump_call_expr_args (t, flags, skipfirst);
1808       }
1809       break;
1810
1811     case TARGET_EXPR:
1812       /* Note that this only works for G++ target exprs.  If somebody
1813          builds a general TARGET_EXPR, there's no way to represent that
1814          it initializes anything other that the parameter slot for the
1815          default argument.  Note we may have cleared out the first
1816          operand in expand_expr, so don't go killing ourselves.  */
1817       if (TREE_OPERAND (t, 1))
1818         dump_expr (TREE_OPERAND (t, 1), flags | TFF_EXPR_IN_PARENS);
1819       break;
1820
1821     case POINTER_PLUS_EXPR:
1822       dump_binary_op ("+", t, flags);
1823       break;
1824
1825     case INIT_EXPR:
1826     case MODIFY_EXPR:
1827     case PLUS_EXPR:
1828     case MINUS_EXPR:
1829     case MULT_EXPR:
1830     case TRUNC_DIV_EXPR:
1831     case TRUNC_MOD_EXPR:
1832     case MIN_EXPR:
1833     case MAX_EXPR:
1834     case LSHIFT_EXPR:
1835     case RSHIFT_EXPR:
1836     case BIT_IOR_EXPR:
1837     case BIT_XOR_EXPR:
1838     case BIT_AND_EXPR:
1839     case TRUTH_ANDIF_EXPR:
1840     case TRUTH_ORIF_EXPR:
1841     case LT_EXPR:
1842     case LE_EXPR:
1843     case GT_EXPR:
1844     case GE_EXPR:
1845     case EQ_EXPR:
1846     case NE_EXPR:
1847     case EXACT_DIV_EXPR:
1848       dump_binary_op (operator_name_info[(int) TREE_CODE (t)].name, t, flags);
1849       break;
1850
1851     case CEIL_DIV_EXPR:
1852     case FLOOR_DIV_EXPR:
1853     case ROUND_DIV_EXPR:
1854     case RDIV_EXPR:
1855       dump_binary_op ("/", t, flags);
1856       break;
1857
1858     case CEIL_MOD_EXPR:
1859     case FLOOR_MOD_EXPR:
1860     case ROUND_MOD_EXPR:
1861       dump_binary_op ("%", t, flags);
1862       break;
1863
1864     case COMPONENT_REF:
1865       {
1866         tree ob = TREE_OPERAND (t, 0);
1867         if (TREE_CODE (ob) == INDIRECT_REF)
1868           {
1869             ob = TREE_OPERAND (ob, 0);
1870             if (TREE_CODE (ob) != PARM_DECL
1871                 || (DECL_NAME (ob)
1872                     && strcmp (IDENTIFIER_POINTER (DECL_NAME (ob)), "this")))
1873               {
1874                 dump_expr (ob, flags | TFF_EXPR_IN_PARENS);
1875                 pp_cxx_arrow (cxx_pp);
1876               }
1877           }
1878         else
1879           {
1880             dump_expr (ob, flags | TFF_EXPR_IN_PARENS);
1881             pp_cxx_dot (cxx_pp);
1882           }
1883         dump_expr (TREE_OPERAND (t, 1), flags & ~TFF_EXPR_IN_PARENS);
1884       }
1885       break;
1886
1887     case ARRAY_REF:
1888       dump_expr (TREE_OPERAND (t, 0), flags | TFF_EXPR_IN_PARENS);
1889       pp_cxx_left_bracket (cxx_pp);
1890       dump_expr (TREE_OPERAND (t, 1), flags | TFF_EXPR_IN_PARENS);
1891       pp_cxx_right_bracket (cxx_pp);
1892       break;
1893
1894     case UNARY_PLUS_EXPR:
1895       dump_unary_op ("+", t, flags);
1896       break;
1897
1898     case ADDR_EXPR:
1899       if (TREE_CODE (TREE_OPERAND (t, 0)) == FUNCTION_DECL
1900           || TREE_CODE (TREE_OPERAND (t, 0)) == STRING_CST
1901           /* An ADDR_EXPR can have reference type.  In that case, we
1902              shouldn't print the `&' doing so indicates to the user
1903              that the expression has pointer type.  */
1904           || (TREE_TYPE (t)
1905               && TREE_CODE (TREE_TYPE (t)) == REFERENCE_TYPE))
1906         dump_expr (TREE_OPERAND (t, 0), flags | TFF_EXPR_IN_PARENS);
1907       else if (TREE_CODE (TREE_OPERAND (t, 0)) == LABEL_DECL)
1908         dump_unary_op ("&&", t, flags);
1909       else
1910         dump_unary_op ("&", t, flags);
1911       break;
1912
1913     case INDIRECT_REF:
1914       if (TREE_HAS_CONSTRUCTOR (t))
1915         {
1916           t = TREE_OPERAND (t, 0);
1917           gcc_assert (TREE_CODE (t) == CALL_EXPR);
1918           dump_expr (CALL_EXPR_FN (t), flags | TFF_EXPR_IN_PARENS);
1919           dump_call_expr_args (t, flags, true);
1920         }
1921       else
1922         {
1923           if (TREE_OPERAND (t,0) != NULL_TREE
1924               && TREE_TYPE (TREE_OPERAND (t, 0))
1925               && NEXT_CODE (TREE_OPERAND (t, 0)) == REFERENCE_TYPE)
1926             dump_expr (TREE_OPERAND (t, 0), flags);
1927           else
1928             dump_unary_op ("*", t, flags);
1929         }
1930       break;
1931
1932     case NEGATE_EXPR:
1933     case BIT_NOT_EXPR:
1934     case TRUTH_NOT_EXPR:
1935     case PREDECREMENT_EXPR:
1936     case PREINCREMENT_EXPR:
1937       dump_unary_op (operator_name_info [(int)TREE_CODE (t)].name, t, flags);
1938       break;
1939
1940     case POSTDECREMENT_EXPR:
1941     case POSTINCREMENT_EXPR:
1942       pp_cxx_left_paren (cxx_pp);
1943       dump_expr (TREE_OPERAND (t, 0), flags | TFF_EXPR_IN_PARENS);
1944       pp_cxx_ws_string (cxx_pp, operator_name_info[(int)TREE_CODE (t)].name);
1945       pp_cxx_right_paren (cxx_pp);
1946       break;
1947
1948     case NON_LVALUE_EXPR:
1949       /* FIXME: This is a KLUDGE workaround for a parsing problem.  There
1950          should be another level of INDIRECT_REF so that I don't have to do
1951          this.  */
1952       if (TREE_TYPE (t) != NULL_TREE && NEXT_CODE (t) == POINTER_TYPE)
1953         {
1954           tree next = TREE_TYPE (TREE_TYPE (t));
1955
1956           while (TREE_CODE (next) == POINTER_TYPE)
1957             next = TREE_TYPE (next);
1958
1959           if (TREE_CODE (next) == FUNCTION_TYPE)
1960             {
1961               if (flags & TFF_EXPR_IN_PARENS)
1962                 pp_cxx_left_paren (cxx_pp);
1963               pp_cxx_star (cxx_pp);
1964               dump_expr (TREE_OPERAND (t, 0), flags & ~TFF_EXPR_IN_PARENS);
1965               if (flags & TFF_EXPR_IN_PARENS)
1966                 pp_cxx_right_paren (cxx_pp);
1967               break;
1968             }
1969           /* Else fall through.  */
1970         }
1971       dump_expr (TREE_OPERAND (t, 0), flags | TFF_EXPR_IN_PARENS);
1972       break;
1973
1974     CASE_CONVERT:
1975     case VIEW_CONVERT_EXPR:
1976       {
1977         tree op = TREE_OPERAND (t, 0);
1978         tree ttype = TREE_TYPE (t);
1979         tree optype = TREE_TYPE (op);
1980
1981         if (TREE_CODE (ttype) != TREE_CODE (optype)
1982             && POINTER_TYPE_P (ttype)
1983             && POINTER_TYPE_P (optype)
1984             && same_type_p (TREE_TYPE (optype),
1985                             TREE_TYPE (ttype)))
1986           {
1987             if (TREE_CODE (ttype) == REFERENCE_TYPE)
1988               dump_unary_op ("*", t, flags);
1989             else
1990               dump_unary_op ("&", t, flags);
1991           }
1992         else if (!same_type_p (TREE_TYPE (op), TREE_TYPE (t)))
1993           {
1994             /* It is a cast, but we cannot tell whether it is a
1995                reinterpret or static cast. Use the C style notation.  */
1996             if (flags & TFF_EXPR_IN_PARENS)
1997               pp_cxx_left_paren (cxx_pp);
1998             pp_cxx_left_paren (cxx_pp);
1999             dump_type (TREE_TYPE (t), flags);
2000             pp_cxx_right_paren (cxx_pp);
2001             dump_expr (op, flags | TFF_EXPR_IN_PARENS);
2002             if (flags & TFF_EXPR_IN_PARENS)
2003               pp_cxx_right_paren (cxx_pp);
2004           }
2005         else
2006           dump_expr (op, flags);
2007         break;
2008       }
2009
2010     case CONSTRUCTOR:
2011       if (TREE_TYPE (t) && TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2012         {
2013           tree idx = build_ptrmemfunc_access_expr (t, pfn_identifier);
2014
2015           if (integer_zerop (idx))
2016             {
2017               /* A NULL pointer-to-member constant.  */
2018               pp_cxx_left_paren (cxx_pp);
2019               pp_cxx_left_paren (cxx_pp);
2020               dump_type (TREE_TYPE (t), flags);
2021               pp_cxx_right_paren (cxx_pp);
2022               pp_character (cxx_pp, '0');
2023               pp_cxx_right_paren (cxx_pp);
2024               break;
2025             }
2026           else if (host_integerp (idx, 0))
2027             {
2028               tree virtuals;
2029               unsigned HOST_WIDE_INT n;
2030
2031               t = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (TREE_TYPE (t)));
2032               t = TYPE_METHOD_BASETYPE (t);
2033               virtuals = BINFO_VIRTUALS (TYPE_BINFO (TYPE_MAIN_VARIANT (t)));
2034
2035               n = tree_low_cst (idx, 0);
2036
2037               /* Map vtable index back one, to allow for the null pointer to
2038                  member.  */
2039               --n;
2040
2041               while (n > 0 && virtuals)
2042                 {
2043                   --n;
2044                   virtuals = TREE_CHAIN (virtuals);
2045                 }
2046               if (virtuals)
2047                 {
2048                   dump_expr (BV_FN (virtuals),
2049                              flags | TFF_EXPR_IN_PARENS);
2050                   break;
2051                 }
2052             }
2053         }
2054       if (TREE_TYPE (t) && EMPTY_CONSTRUCTOR_P (t))
2055         {
2056           dump_type (TREE_TYPE (t), 0);
2057           pp_cxx_left_paren (cxx_pp);
2058           pp_cxx_right_paren (cxx_pp);
2059         }
2060       else
2061         {
2062           pp_cxx_left_brace (cxx_pp);
2063           dump_expr_init_vec (CONSTRUCTOR_ELTS (t), flags);
2064           pp_cxx_right_brace (cxx_pp);
2065         }
2066
2067       break;
2068
2069     case OFFSET_REF:
2070       {
2071         tree ob = TREE_OPERAND (t, 0);
2072         if (is_dummy_object (ob))
2073           {
2074             t = TREE_OPERAND (t, 1);
2075             if (TREE_CODE (t) == FUNCTION_DECL)
2076               /* A::f */
2077               dump_expr (t, flags | TFF_EXPR_IN_PARENS);
2078             else if (BASELINK_P (t))
2079               dump_expr (OVL_CURRENT (BASELINK_FUNCTIONS (t)),
2080                          flags | TFF_EXPR_IN_PARENS);
2081             else
2082               dump_decl (t, flags);
2083           }
2084         else
2085           {
2086             if (TREE_CODE (ob) == INDIRECT_REF)
2087               {
2088                 dump_expr (TREE_OPERAND (ob, 0), flags | TFF_EXPR_IN_PARENS);
2089                 pp_cxx_arrow (cxx_pp);
2090                 pp_cxx_star (cxx_pp);
2091               }
2092             else
2093               {
2094                 dump_expr (ob, flags | TFF_EXPR_IN_PARENS);
2095                 pp_cxx_dot (cxx_pp);
2096                 pp_cxx_star (cxx_pp);
2097               }
2098             dump_expr (TREE_OPERAND (t, 1), flags | TFF_EXPR_IN_PARENS);
2099           }
2100         break;
2101       }
2102
2103     case TEMPLATE_PARM_INDEX:
2104       dump_decl (TEMPLATE_PARM_DECL (t), flags & ~TFF_DECL_SPECIFIERS);
2105       break;
2106
2107     case CAST_EXPR:
2108       if (TREE_OPERAND (t, 0) == NULL_TREE
2109           || TREE_CHAIN (TREE_OPERAND (t, 0)))
2110         {
2111           dump_type (TREE_TYPE (t), flags);
2112           pp_cxx_left_paren (cxx_pp);
2113           dump_expr_list (TREE_OPERAND (t, 0), flags);
2114           pp_cxx_right_paren (cxx_pp);
2115         }
2116       else
2117         {
2118           pp_cxx_left_paren (cxx_pp);
2119           dump_type (TREE_TYPE (t), flags);
2120           pp_cxx_right_paren (cxx_pp);
2121           pp_cxx_left_paren (cxx_pp);
2122           dump_expr_list (TREE_OPERAND (t, 0), flags);
2123           pp_cxx_right_paren (cxx_pp);
2124         }
2125       break;
2126
2127     case STATIC_CAST_EXPR:
2128       pp_cxx_ws_string (cxx_pp, "static_cast");
2129       goto cast;
2130     case REINTERPRET_CAST_EXPR:
2131       pp_cxx_ws_string (cxx_pp, "reinterpret_cast");
2132       goto cast;
2133     case CONST_CAST_EXPR:
2134       pp_cxx_ws_string (cxx_pp, "const_cast");
2135       goto cast;
2136     case DYNAMIC_CAST_EXPR:
2137       pp_cxx_ws_string (cxx_pp, "dynamic_cast");
2138     cast:
2139       pp_cxx_begin_template_argument_list (cxx_pp);
2140       dump_type (TREE_TYPE (t), flags);
2141       pp_cxx_end_template_argument_list (cxx_pp);
2142       pp_cxx_left_paren (cxx_pp);
2143       dump_expr (TREE_OPERAND (t, 0), flags);
2144       pp_cxx_right_paren (cxx_pp);
2145       break;
2146
2147     case ARROW_EXPR:
2148       dump_expr (TREE_OPERAND (t, 0), flags);
2149       pp_cxx_arrow (cxx_pp);
2150       break;
2151
2152     case SIZEOF_EXPR:
2153     case ALIGNOF_EXPR:
2154       if (TREE_CODE (t) == SIZEOF_EXPR)
2155         pp_cxx_ws_string (cxx_pp, "sizeof");
2156       else
2157         {
2158           gcc_assert (TREE_CODE (t) == ALIGNOF_EXPR);
2159           pp_cxx_ws_string (cxx_pp, "__alignof__");
2160         }
2161       pp_cxx_whitespace (cxx_pp);
2162       pp_cxx_left_paren (cxx_pp);
2163       if (TYPE_P (TREE_OPERAND (t, 0)))
2164         dump_type (TREE_OPERAND (t, 0), flags);
2165       else
2166         dump_expr (TREE_OPERAND (t, 0), flags);
2167       pp_cxx_right_paren (cxx_pp);
2168       break;
2169
2170     case AT_ENCODE_EXPR:
2171       pp_cxx_ws_string (cxx_pp, "@encode");
2172       pp_cxx_whitespace (cxx_pp);
2173       pp_cxx_left_paren (cxx_pp);
2174       dump_type (TREE_OPERAND (t, 0), flags);
2175       pp_cxx_right_paren (cxx_pp);
2176       break;
2177
2178     case NOEXCEPT_EXPR:
2179       pp_cxx_ws_string (cxx_pp, "noexcept");
2180       pp_cxx_whitespace (cxx_pp);
2181       pp_cxx_left_paren (cxx_pp);
2182       dump_expr (TREE_OPERAND (t, 0), flags);
2183       pp_cxx_right_paren (cxx_pp);
2184       break;
2185
2186     case REALPART_EXPR:
2187     case IMAGPART_EXPR:
2188       pp_cxx_ws_string (cxx_pp, operator_name_info[TREE_CODE (t)].name);
2189       pp_cxx_whitespace (cxx_pp);
2190       dump_expr (TREE_OPERAND (t, 0), flags);
2191       break;
2192
2193     case DEFAULT_ARG:
2194       pp_string (cxx_pp, M_("<unparsed>"));
2195       break;
2196
2197     case TRY_CATCH_EXPR:
2198     case WITH_CLEANUP_EXPR:
2199     case CLEANUP_POINT_EXPR:
2200       dump_expr (TREE_OPERAND (t, 0), flags);
2201       break;
2202
2203     case PSEUDO_DTOR_EXPR:
2204       dump_expr (TREE_OPERAND (t, 2), flags);
2205       pp_cxx_dot (cxx_pp);
2206       dump_type (TREE_OPERAND (t, 0), flags);
2207       pp_cxx_colon_colon (cxx_pp);
2208       pp_cxx_complement (cxx_pp);
2209       dump_type (TREE_OPERAND (t, 1), flags);
2210       break;
2211
2212     case TEMPLATE_ID_EXPR:
2213       dump_decl (t, flags);
2214       break;
2215
2216     case BIND_EXPR:
2217     case STMT_EXPR:
2218     case EXPR_STMT:
2219     case STATEMENT_LIST:
2220       /* We don't yet have a way of dumping statements in a
2221          human-readable format.  */
2222       pp_string (cxx_pp, "({...})");
2223       break;
2224
2225     case LOOP_EXPR:
2226       pp_string (cxx_pp, "while (1) { ");
2227       dump_expr (TREE_OPERAND (t, 0), flags & ~TFF_EXPR_IN_PARENS);
2228       pp_cxx_right_brace (cxx_pp);
2229       break;
2230
2231     case EXIT_EXPR:
2232       pp_string (cxx_pp, "if (");
2233       dump_expr (TREE_OPERAND (t, 0), flags & ~TFF_EXPR_IN_PARENS);
2234       pp_string (cxx_pp, ") break; ");
2235       break;
2236
2237     case BASELINK:
2238       dump_expr (get_first_fn (t), flags & ~TFF_EXPR_IN_PARENS);
2239       break;
2240
2241     case EMPTY_CLASS_EXPR:
2242       dump_type (TREE_TYPE (t), flags);
2243       pp_cxx_left_paren (cxx_pp);
2244       pp_cxx_right_paren (cxx_pp);
2245       break;
2246
2247     case NON_DEPENDENT_EXPR:
2248       dump_expr (TREE_OPERAND (t, 0), flags);
2249       break;
2250
2251     case ARGUMENT_PACK_SELECT:
2252       dump_template_argument (ARGUMENT_PACK_SELECT_FROM_PACK (t), flags);
2253       break;
2254
2255     case RECORD_TYPE:
2256     case UNION_TYPE:
2257     case ENUMERAL_TYPE:
2258     case REAL_TYPE:
2259     case VOID_TYPE:
2260     case BOOLEAN_TYPE:
2261     case INTEGER_TYPE:
2262     case COMPLEX_TYPE:
2263     case VECTOR_TYPE:
2264       pp_type_specifier_seq (cxx_pp, t);
2265       break;
2266
2267     case TYPENAME_TYPE:
2268       /* We get here when we want to print a dependent type as an
2269          id-expression, without any disambiguator decoration.  */
2270       pp_id_expression (cxx_pp, t);
2271       break;
2272
2273     case TEMPLATE_TYPE_PARM:
2274     case BOUND_TEMPLATE_TEMPLATE_PARM:
2275       dump_type (t, flags);
2276       break;
2277
2278     case TRAIT_EXPR:
2279       pp_cxx_trait_expression (cxx_pp, t);
2280       break;
2281
2282     case VA_ARG_EXPR:
2283       pp_cxx_va_arg_expression (cxx_pp, t);
2284       break;
2285
2286     case OFFSETOF_EXPR:
2287       pp_cxx_offsetof_expression (cxx_pp, t);
2288       break;
2289
2290     case SCOPE_REF:
2291       dump_decl (t, flags);
2292       break;
2293
2294     case EXPR_PACK_EXPANSION:
2295     case TYPEID_EXPR:
2296     case MEMBER_REF:
2297     case DOTSTAR_EXPR:
2298     case NEW_EXPR:
2299     case VEC_NEW_EXPR:
2300     case DELETE_EXPR:
2301     case VEC_DELETE_EXPR:
2302     case MODOP_EXPR:
2303     case ABS_EXPR:
2304     case CONJ_EXPR:
2305     case VECTOR_CST:
2306     case FIXED_CST:
2307     case UNORDERED_EXPR:
2308     case ORDERED_EXPR:
2309     case UNLT_EXPR:
2310     case UNLE_EXPR:
2311     case UNGT_EXPR:
2312     case UNGE_EXPR:
2313     case UNEQ_EXPR:
2314     case LTGT_EXPR:
2315     case COMPLEX_EXPR:
2316     case BIT_FIELD_REF:
2317     case FIX_TRUNC_EXPR:
2318     case FLOAT_EXPR:
2319       pp_expression (cxx_pp, t);
2320       break;
2321
2322     case TRUTH_AND_EXPR:
2323     case TRUTH_OR_EXPR:
2324     case TRUTH_XOR_EXPR:
2325       if (flags & TFF_EXPR_IN_PARENS)
2326         pp_cxx_left_paren (cxx_pp);
2327       pp_expression (cxx_pp, t);
2328       if (flags & TFF_EXPR_IN_PARENS)
2329         pp_cxx_right_paren (cxx_pp);
2330       break;
2331
2332     case OBJ_TYPE_REF:
2333       dump_expr (resolve_virtual_fun_from_obj_type_ref (t), flags);
2334       break;
2335
2336       /*  This list is incomplete, but should suffice for now.
2337           It is very important that `sorry' does not call
2338           `report_error_function'.  That could cause an infinite loop.  */
2339     default:
2340       pp_unsupported_tree (cxx_pp, t);
2341       /* fall through to ERROR_MARK...  */
2342     case ERROR_MARK:
2343       pp_string (cxx_pp, M_("<expression error>"));
2344       break;
2345     }
2346 }
2347
2348 static void
2349 dump_binary_op (const char *opstring, tree t, int flags)
2350 {
2351   pp_cxx_left_paren (cxx_pp);
2352   dump_expr (TREE_OPERAND (t, 0), flags | TFF_EXPR_IN_PARENS);
2353   pp_cxx_whitespace (cxx_pp);
2354   if (opstring)
2355     pp_cxx_ws_string (cxx_pp, opstring);
2356   else
2357     pp_string (cxx_pp, M_("<unknown operator>"));
2358   pp_cxx_whitespace (cxx_pp);
2359   dump_expr (TREE_OPERAND (t, 1), flags | TFF_EXPR_IN_PARENS);
2360   pp_cxx_right_paren (cxx_pp);
2361 }
2362
2363 static void
2364 dump_unary_op (const char *opstring, tree t, int flags)
2365 {
2366   if (flags & TFF_EXPR_IN_PARENS)
2367     pp_cxx_left_paren (cxx_pp);
2368   pp_cxx_ws_string (cxx_pp, opstring);
2369   dump_expr (TREE_OPERAND (t, 0), flags & ~TFF_EXPR_IN_PARENS);
2370   if (flags & TFF_EXPR_IN_PARENS)
2371     pp_cxx_right_paren (cxx_pp);
2372 }
2373
2374 static void
2375 reinit_cxx_pp (void)
2376 {
2377   pp_clear_output_area (cxx_pp);
2378   pp_base (cxx_pp)->padding = pp_none;
2379   pp_indentation (cxx_pp) = 0;
2380   pp_needs_newline (cxx_pp) = false;
2381   cxx_pp->enclosing_scope = current_function_decl;
2382 }
2383
2384
2385 /* Exported interface to stringifying types, exprs and decls under TFF_*
2386    control.  */
2387
2388 const char *
2389 type_as_string (tree typ, int flags)
2390 {
2391   reinit_cxx_pp ();
2392   pp_translate_identifiers (cxx_pp) = false;
2393   dump_type (typ, flags);
2394   return pp_formatted_text (cxx_pp);
2395 }
2396
2397 const char *
2398 type_as_string_translate (tree typ, int flags)
2399 {
2400   reinit_cxx_pp ();
2401   dump_type (typ, flags);
2402   return pp_formatted_text (cxx_pp);
2403 }
2404
2405 const char *
2406 expr_as_string (tree decl, int flags)
2407 {
2408   reinit_cxx_pp ();
2409   pp_translate_identifiers (cxx_pp) = false;
2410   dump_expr (decl, flags);
2411   return pp_formatted_text (cxx_pp);
2412 }
2413
2414 const char *
2415 decl_as_string (tree decl, int flags)
2416 {
2417   reinit_cxx_pp ();
2418   pp_translate_identifiers (cxx_pp) = false;
2419   dump_decl (decl, flags);
2420   return pp_formatted_text (cxx_pp);
2421 }
2422
2423 const char *
2424 decl_as_string_translate (tree decl, int flags)
2425 {
2426   reinit_cxx_pp ();
2427   dump_decl (decl, flags);
2428   return pp_formatted_text (cxx_pp);
2429 }
2430
2431 /* Generate the three forms of printable names for cxx_printable_name.  */
2432
2433 const char *
2434 lang_decl_name (tree decl, int v, bool translate)
2435 {
2436   if (v >= 2)
2437     return (translate
2438             ? decl_as_string_translate (decl, TFF_DECL_SPECIFIERS)
2439             : decl_as_string (decl, TFF_DECL_SPECIFIERS));
2440
2441   reinit_cxx_pp ();
2442   pp_translate_identifiers (cxx_pp) = translate;
2443   if (v == 1
2444       && (DECL_CLASS_SCOPE_P (decl)
2445           || (DECL_NAMESPACE_SCOPE_P (decl)
2446               && CP_DECL_CONTEXT (decl) != global_namespace)))
2447     {
2448       dump_type (CP_DECL_CONTEXT (decl), TFF_PLAIN_IDENTIFIER);
2449       pp_cxx_colon_colon (cxx_pp);
2450     }
2451
2452   if (TREE_CODE (decl) == FUNCTION_DECL)
2453     dump_function_name (decl, TFF_PLAIN_IDENTIFIER);
2454   else
2455     dump_decl (DECL_NAME (decl), TFF_PLAIN_IDENTIFIER);
2456
2457   return pp_formatted_text (cxx_pp);
2458 }
2459
2460 /* Return the location of a tree passed to %+ formats.  */
2461
2462 static location_t
2463 location_of (tree t)
2464 {
2465   if (TREE_CODE (t) == PARM_DECL && DECL_CONTEXT (t))
2466     t = DECL_CONTEXT (t);
2467   else if (TYPE_P (t))
2468     t = TYPE_MAIN_DECL (t);
2469   else if (TREE_CODE (t) == OVERLOAD)
2470     t = OVL_FUNCTION (t);
2471
2472   if (DECL_P (t))
2473     return DECL_SOURCE_LOCATION (t);
2474   return EXPR_LOC_OR_HERE (t);
2475 }
2476
2477 /* Now the interfaces from error et al to dump_type et al. Each takes an
2478    on/off VERBOSE flag and supply the appropriate TFF_ flags to a dump_
2479    function.  */
2480
2481 static const char *
2482 decl_to_string (tree decl, int verbose)
2483 {
2484   int flags = 0;
2485
2486   if (TREE_CODE (decl) == TYPE_DECL || TREE_CODE (decl) == RECORD_TYPE
2487       || TREE_CODE (decl) == UNION_TYPE || TREE_CODE (decl) == ENUMERAL_TYPE)
2488     flags = TFF_CLASS_KEY_OR_ENUM;
2489   if (verbose)
2490     flags |= TFF_DECL_SPECIFIERS;
2491   else if (TREE_CODE (decl) == FUNCTION_DECL)
2492     flags |= TFF_DECL_SPECIFIERS | TFF_RETURN_TYPE;
2493   flags |= TFF_TEMPLATE_HEADER;
2494
2495   reinit_cxx_pp ();
2496   dump_decl (decl, flags);
2497   return pp_formatted_text (cxx_pp);
2498 }
2499
2500 static const char *
2501 expr_to_string (tree decl)
2502 {
2503   reinit_cxx_pp ();
2504   dump_expr (decl, 0);
2505   return pp_formatted_text (cxx_pp);
2506 }
2507
2508 static const char *
2509 fndecl_to_string (tree fndecl, int verbose)
2510 {
2511   int flags;
2512
2513   flags = TFF_EXCEPTION_SPECIFICATION | TFF_DECL_SPECIFIERS
2514     | TFF_TEMPLATE_HEADER;
2515   if (verbose)
2516     flags |= TFF_FUNCTION_DEFAULT_ARGUMENTS;
2517   reinit_cxx_pp ();
2518   dump_decl (fndecl, flags);
2519   return pp_formatted_text (cxx_pp);
2520 }
2521
2522
2523 static const char *
2524 code_to_string (enum tree_code c)
2525 {
2526   return tree_code_name [c];
2527 }
2528
2529 const char *
2530 language_to_string (enum languages c)
2531 {
2532   switch (c)
2533     {
2534     case lang_c:
2535       return "C";
2536
2537     case lang_cplusplus:
2538       return "C++";
2539
2540     case lang_java:
2541       return "Java";
2542
2543     default:
2544       gcc_unreachable ();
2545     }
2546   return NULL;
2547 }
2548
2549 /* Return the proper printed version of a parameter to a C++ function.  */
2550
2551 static const char *
2552 parm_to_string (int p)
2553 {
2554   reinit_cxx_pp ();
2555   if (p < 0)
2556     pp_string (cxx_pp, "'this'");
2557   else
2558     pp_decimal_int (cxx_pp, p + 1);
2559   return pp_formatted_text (cxx_pp);
2560 }
2561
2562 static const char *
2563 op_to_string (enum tree_code p)
2564 {
2565   tree id = operator_name_info[(int) p].identifier;
2566   return id ? IDENTIFIER_POINTER (id) : M_("<unknown>");
2567 }
2568
2569 static const char *
2570 type_to_string (tree typ, int verbose)
2571 {
2572   int flags = 0;
2573   if (verbose)
2574     flags |= TFF_CLASS_KEY_OR_ENUM;
2575   flags |= TFF_TEMPLATE_HEADER;
2576
2577   reinit_cxx_pp ();
2578   dump_type (typ, flags);
2579   return pp_formatted_text (cxx_pp);
2580 }
2581
2582 static const char *
2583 assop_to_string (enum tree_code p)
2584 {
2585   tree id = assignment_operator_name_info[(int) p].identifier;
2586   return id ? IDENTIFIER_POINTER (id) : M_("{unknown}");
2587 }
2588
2589 static const char *
2590 args_to_string (tree p, int verbose)
2591 {
2592   int flags = 0;
2593   if (verbose)
2594     flags |= TFF_CLASS_KEY_OR_ENUM;
2595
2596   if (p == NULL_TREE)
2597     return "";
2598
2599   if (TYPE_P (TREE_VALUE (p)))
2600     return type_as_string_translate (p, flags);
2601
2602   reinit_cxx_pp ();
2603   for (; p; p = TREE_CHAIN (p))
2604     {
2605       if (TREE_VALUE (p) == null_node)
2606         pp_cxx_ws_string (cxx_pp, "NULL");
2607       else
2608         dump_type (error_type (TREE_VALUE (p)), flags);
2609       if (TREE_CHAIN (p))
2610         pp_separate_with_comma (cxx_pp);
2611     }
2612   return pp_formatted_text (cxx_pp);
2613 }
2614
2615 static const char *
2616 cv_to_string (tree p, int v)
2617 {
2618   reinit_cxx_pp ();
2619   pp_base (cxx_pp)->padding = v ? pp_before : pp_none;
2620   pp_cxx_cv_qualifier_seq (cxx_pp, p);
2621   return pp_formatted_text (cxx_pp);
2622 }
2623
2624 /* Langhook for print_error_function.  */
2625 void
2626 cxx_print_error_function (diagnostic_context *context, const char *file,
2627                           diagnostic_info *diagnostic)
2628 {
2629   lhd_print_error_function (context, file, diagnostic);
2630   pp_base_set_prefix (context->printer, file);
2631   maybe_print_instantiation_context (context);
2632 }
2633
2634 static void
2635 cp_diagnostic_starter (diagnostic_context *context,
2636                        diagnostic_info *diagnostic)
2637 {
2638   diagnostic_report_current_module (context);
2639   cp_print_error_function (context, diagnostic);
2640   maybe_print_instantiation_context (context);
2641   maybe_print_constexpr_context (context);
2642   pp_base_set_prefix (context->printer, diagnostic_build_prefix (context,
2643                                                                  diagnostic));
2644 }
2645
2646 static void
2647 cp_diagnostic_finalizer (diagnostic_context *context,
2648                          diagnostic_info *diagnostic ATTRIBUTE_UNUSED)
2649 {
2650   pp_base_destroy_prefix (context->printer);
2651 }
2652
2653 /* Print current function onto BUFFER, in the process of reporting
2654    a diagnostic message.  Called from cp_diagnostic_starter.  */
2655 static void
2656 cp_print_error_function (diagnostic_context *context,
2657                          diagnostic_info *diagnostic)
2658 {
2659   if (diagnostic_last_function_changed (context, diagnostic))
2660     {
2661       const char *old_prefix = context->printer->prefix;
2662       const char *file = LOCATION_FILE (diagnostic->location);
2663       tree abstract_origin = diagnostic_abstract_origin (diagnostic);
2664       char *new_prefix = (file && abstract_origin == NULL)
2665                          ? file_name_as_prefix (file) : NULL;
2666
2667       pp_base_set_prefix (context->printer, new_prefix);
2668
2669       if (current_function_decl == NULL)
2670         pp_base_string (context->printer, _("At global scope:"));
2671       else
2672         {
2673           tree fndecl, ao;
2674
2675           if (abstract_origin)
2676             {
2677               ao = BLOCK_ABSTRACT_ORIGIN (abstract_origin);
2678               while (TREE_CODE (ao) == BLOCK
2679                      && BLOCK_ABSTRACT_ORIGIN (ao)
2680                      && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
2681                 ao = BLOCK_ABSTRACT_ORIGIN (ao);
2682               gcc_assert (TREE_CODE (ao) == FUNCTION_DECL);
2683               fndecl = ao;
2684             }
2685           else
2686             fndecl = current_function_decl;
2687
2688           pp_printf (context->printer, function_category (fndecl),
2689                      cxx_printable_name_translate (fndecl, 2));
2690
2691           while (abstract_origin)
2692             {
2693               location_t *locus;
2694               tree block = abstract_origin;
2695
2696               locus = &BLOCK_SOURCE_LOCATION (block);
2697               fndecl = NULL;
2698               block = BLOCK_SUPERCONTEXT (block);
2699               while (block && TREE_CODE (block) == BLOCK
2700                      && BLOCK_ABSTRACT_ORIGIN (block))
2701                 {
2702                   ao = BLOCK_ABSTRACT_ORIGIN (block);
2703
2704                   while (TREE_CODE (ao) == BLOCK
2705                          && BLOCK_ABSTRACT_ORIGIN (ao)
2706                          && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
2707                     ao = BLOCK_ABSTRACT_ORIGIN (ao);
2708
2709                   if (TREE_CODE (ao) == FUNCTION_DECL)
2710                     {
2711                       fndecl = ao;
2712                       break;
2713                     }
2714                   else if (TREE_CODE (ao) != BLOCK)
2715                     break;
2716
2717                   block = BLOCK_SUPERCONTEXT (block);
2718                 }
2719               if (fndecl)
2720                 abstract_origin = block;
2721               else
2722                 {
2723                   while (block && TREE_CODE (block) == BLOCK)
2724                     block = BLOCK_SUPERCONTEXT (block);
2725
2726                   if (block && TREE_CODE (block) == FUNCTION_DECL)
2727                     fndecl = block;
2728                   abstract_origin = NULL;
2729                 }
2730               if (fndecl)
2731                 {
2732                   expanded_location s = expand_location (*locus);
2733                   pp_base_character (context->printer, ',');
2734                   pp_base_newline (context->printer);
2735                   if (s.file != NULL)
2736                     {
2737                       if (context->show_column && s.column != 0)
2738                         pp_printf (context->printer,
2739                                    _("    inlined from %qs at %s:%d:%d"),
2740                                    cxx_printable_name_translate (fndecl, 2),
2741                                    s.file, s.line, s.column);
2742                       else
2743                         pp_printf (context->printer,
2744                                    _("    inlined from %qs at %s:%d"),
2745                                    cxx_printable_name_translate (fndecl, 2),
2746                                    s.file, s.line);
2747
2748                     }
2749                   else
2750                     pp_printf (context->printer, _("    inlined from %qs"),
2751                                cxx_printable_name_translate (fndecl, 2));
2752                 }
2753             }
2754           pp_base_character (context->printer, ':');
2755         }
2756       pp_base_newline (context->printer);
2757
2758       diagnostic_set_last_function (context, diagnostic);
2759       pp_base_destroy_prefix (context->printer);
2760       context->printer->prefix = old_prefix;
2761     }
2762 }
2763
2764 /* Returns a description of FUNCTION using standard terminology.  The
2765    result is a format string of the form "In CATEGORY %qs".  */
2766 static const char *
2767 function_category (tree fn)
2768 {
2769   /* We can get called from the middle-end for diagnostics of function
2770      clones.  Make sure we have language specific information before
2771      dereferencing it.  */
2772   if (DECL_LANG_SPECIFIC (STRIP_TEMPLATE (fn))
2773       && DECL_FUNCTION_MEMBER_P (fn))
2774     {
2775       if (DECL_STATIC_FUNCTION_P (fn))
2776         return _("In static member function %qs");
2777       else if (DECL_COPY_CONSTRUCTOR_P (fn))
2778         return _("In copy constructor %qs");
2779       else if (DECL_CONSTRUCTOR_P (fn))
2780         return _("In constructor %qs");
2781       else if (DECL_DESTRUCTOR_P (fn))
2782         return _("In destructor %qs");
2783       else if (LAMBDA_FUNCTION_P (fn))
2784         return _("In lambda function");
2785       else
2786         return _("In member function %qs");
2787     }
2788   else
2789     return _("In function %qs");
2790 }
2791
2792 /* Report the full context of a current template instantiation,
2793    onto BUFFER.  */
2794 static void
2795 print_instantiation_full_context (diagnostic_context *context)
2796 {
2797   struct tinst_level *p = current_instantiation ();
2798   location_t location = input_location;
2799
2800   if (p)
2801     {
2802       if (current_function_decl != p->decl
2803           && current_function_decl != NULL_TREE)
2804         /* We can get here during the processing of some synthesized
2805            method.  Then, P->DECL will be the function that's causing
2806            the synthesis.  */
2807         ;
2808       else
2809         {
2810           if (current_function_decl == p->decl)
2811             /* Avoid redundancy with the "In function" line.  */;
2812           else
2813             pp_verbatim (context->printer,
2814                          _("%s: In instantiation of %qs:\n"),
2815                          LOCATION_FILE (location),
2816                          decl_as_string_translate (p->decl,
2817                                                    TFF_DECL_SPECIFIERS | TFF_RETURN_TYPE));
2818
2819           location = p->locus;
2820           p = p->next;
2821         }
2822     }
2823
2824   print_instantiation_partial_context (context, p, location);
2825 }
2826
2827 /* Helper function of print_instantiation_partial_context() that
2828    prints a single line of instantiation context.  */
2829
2830 static void
2831 print_instantiation_partial_context_line (diagnostic_context *context,
2832                                           const struct tinst_level *t,
2833                                           location_t loc, bool recursive_p)
2834 {
2835   expanded_location xloc;
2836   xloc = expand_location (loc);
2837
2838   if (t != NULL)
2839     {
2840       const char *str;
2841       str = decl_as_string_translate (t->decl,
2842                                       TFF_DECL_SPECIFIERS | TFF_RETURN_TYPE);
2843       if (context->show_column)
2844         pp_verbatim (context->printer,
2845                      recursive_p
2846                      ? _("%s:%d:%d:   recursively instantiated from %qs\n")
2847                      : _("%s:%d:%d:   instantiated from %qs\n"),
2848                      xloc.file, xloc.line, xloc.column, str);
2849       else
2850         pp_verbatim (context->printer,
2851                      recursive_p
2852                      ? _("%s:%d:   recursively instantiated from %qs\n")
2853                      : _("%s:%d:   recursively instantiated from %qs\n"),
2854                      xloc.file, xloc.line, str);
2855     }
2856   else
2857     {
2858       if (context->show_column)
2859         pp_verbatim (context->printer,
2860                      recursive_p
2861                      ? _("%s:%d:%d:   recursively instantiated from here")
2862                      : _("%s:%d:%d:   instantiated from here"),
2863                      xloc.file, xloc.line, xloc.column);
2864       else
2865         pp_verbatim (context->printer,
2866                      recursive_p
2867                      ? _("%s:%d:   recursively instantiated from here")
2868                      : _("%s:%d:   instantiated from here"),
2869                      xloc.file, xloc.line);
2870     }
2871 }
2872
2873 /* Same as print_instantiation_full_context but less verbose.  */
2874
2875 static void
2876 print_instantiation_partial_context (diagnostic_context *context,
2877                                      struct tinst_level *t0, location_t loc)
2878 {
2879   struct tinst_level *t;
2880   int n_total = 0;
2881   int n;
2882   location_t prev_loc = loc;
2883
2884   for (t = t0; t != NULL; t = t->next)
2885     if (prev_loc != t->locus)
2886       {
2887         prev_loc = t->locus;
2888         n_total++;
2889       }
2890
2891   t = t0;
2892
2893   if (n_total >= 12)
2894     {
2895       int skip = n_total - 10;
2896       for (n = 0; n < 5; n++)
2897         {
2898           gcc_assert (t != NULL);
2899           if (loc != t->locus)
2900             print_instantiation_partial_context_line (context, t, loc,
2901                                                       /*recursive_p=*/false);
2902           loc = t->locus;
2903           t = t->next;
2904         }
2905       if (t != NULL && skip > 1)
2906         {
2907           expanded_location xloc;
2908           xloc = expand_location (loc);
2909           if (context->show_column)
2910             pp_verbatim (context->printer,
2911                          _("%s:%d:%d:   [ skipping %d instantiation contexts ]\n"),
2912                          xloc.file, xloc.line, xloc.column, skip);
2913           else
2914             pp_verbatim (context->printer,
2915                          _("%s:%d:   [ skipping %d instantiation contexts ]\n"),
2916                          xloc.file, xloc.line, skip);
2917
2918           do {
2919             loc = t->locus;
2920             t = t->next;
2921           } while (t != NULL && --skip > 0);
2922         }
2923     }
2924
2925   while (t != NULL)
2926     {
2927       while (t->next != NULL && t->locus == t->next->locus)
2928         {
2929           loc = t->locus;
2930           t = t->next;
2931         }
2932       print_instantiation_partial_context_line (context, t, loc,
2933                                                 t->locus == loc);
2934       loc = t->locus;
2935       t = t->next;
2936     }
2937   print_instantiation_partial_context_line (context, NULL, loc,
2938                                             /*recursive_p=*/false);
2939   pp_base_newline (context->printer);
2940 }
2941
2942 /* Called from cp_thing to print the template context for an error.  */
2943 static void
2944 maybe_print_instantiation_context (diagnostic_context *context)
2945 {
2946   if (!problematic_instantiation_changed () || current_instantiation () == 0)
2947     return;
2948
2949   record_last_problematic_instantiation ();
2950   print_instantiation_full_context (context);
2951 }
2952
2953 /* Report the bare minimum context of a template instantiation.  */
2954 void
2955 print_instantiation_context (void)
2956 {
2957   print_instantiation_partial_context
2958     (global_dc, current_instantiation (), input_location);
2959   diagnostic_flush_buffer (global_dc);
2960 }
2961 \f
2962 /* Report what constexpr call(s) we're trying to expand, if any.  */
2963
2964 void
2965 maybe_print_constexpr_context (diagnostic_context *context)
2966 {
2967   VEC(tree,heap) *call_stack = cx_error_context ();
2968   unsigned ix;
2969   tree t;
2970
2971   FOR_EACH_VEC_ELT (tree, call_stack, ix, t)
2972     {
2973       expanded_location xloc = expand_location (EXPR_LOCATION (t));
2974       const char *s = expr_as_string (t, 0);
2975       if (context->show_column)
2976         pp_verbatim (context->printer,
2977                      _("%s:%d:%d:   in constexpr expansion of %qs"),
2978                      xloc.file, xloc.line, xloc.column, s);
2979       else
2980         pp_verbatim (context->printer,
2981                      _("%s:%d:   in constexpr expansion of %qs"),
2982                      xloc.file, xloc.line, s);
2983       pp_base_newline (context->printer);
2984     }
2985 }
2986 \f
2987 /* Called from output_format -- during diagnostic message processing --
2988    to handle C++ specific format specifier with the following meanings:
2989    %A   function argument-list.
2990    %C   tree code.
2991    %D   declaration.
2992    %E   expression.
2993    %F   function declaration.
2994    %L   language as used in extern "lang".
2995    %O   binary operator.
2996    %P   function parameter whose position is indicated by an integer.
2997    %Q   assignment operator.
2998    %T   type.
2999    %V   cv-qualifier.  */
3000 static bool
3001 cp_printer (pretty_printer *pp, text_info *text, const char *spec,
3002             int precision, bool wide, bool set_locus, bool verbose)
3003 {
3004   const char *result;
3005   tree t = NULL;
3006 #define next_tree    (t = va_arg (*text->args_ptr, tree))
3007 #define next_tcode   ((enum tree_code) va_arg (*text->args_ptr, int))
3008 #define next_lang    ((enum languages) va_arg (*text->args_ptr, int))
3009 #define next_int     va_arg (*text->args_ptr, int)
3010
3011   if (precision != 0 || wide)
3012     return false;
3013
3014   if (text->locus == NULL)
3015     set_locus = false;
3016
3017   switch (*spec)
3018     {
3019     case 'A': result = args_to_string (next_tree, verbose);     break;
3020     case 'C': result = code_to_string (next_tcode);             break;
3021     case 'D':
3022       {
3023         tree temp = next_tree;
3024         if (DECL_P (temp)
3025             && DECL_DEBUG_EXPR_IS_FROM (temp) && DECL_DEBUG_EXPR (temp))
3026           {
3027             temp = DECL_DEBUG_EXPR (temp);
3028             if (!DECL_P (temp))
3029               {
3030                 result = expr_to_string (temp);
3031                 break;
3032               }
3033           }
3034         result = decl_to_string (temp, verbose);
3035       }
3036       break;
3037     case 'E': result = expr_to_string (next_tree);              break;
3038     case 'F': result = fndecl_to_string (next_tree, verbose);   break;
3039     case 'L': result = language_to_string (next_lang);          break;
3040     case 'O': result = op_to_string (next_tcode);               break;
3041     case 'P': result = parm_to_string (next_int);               break;
3042     case 'Q': result = assop_to_string (next_tcode);            break;
3043     case 'T': result = type_to_string (next_tree, verbose);     break;
3044     case 'V': result = cv_to_string (next_tree, verbose);       break;
3045
3046     case 'K':
3047       percent_K_format (text);
3048       return true;
3049
3050     default:
3051       return false;
3052     }
3053
3054   pp_base_string (pp, result);
3055   if (set_locus && t != NULL)
3056     *text->locus = location_of (t);
3057   return true;
3058 #undef next_tree
3059 #undef next_tcode
3060 #undef next_lang
3061 #undef next_int
3062 }
3063 \f
3064 /* Warn about the use of C++0x features when appropriate.  */
3065 void
3066 maybe_warn_cpp0x (cpp0x_warn_str str)
3067 {
3068   if ((cxx_dialect == cxx98) && !in_system_header)
3069     /* We really want to suppress this warning in system headers,
3070        because libstdc++ uses variadic templates even when we aren't
3071        in C++0x mode. */
3072     switch (str)
3073       {
3074       case CPP0X_INITIALIZER_LISTS:
3075         pedwarn (input_location, 0,
3076                  "extended initializer lists "
3077                  "only available with -std=c++0x or -std=gnu++0x");
3078         break;
3079       case CPP0X_EXPLICIT_CONVERSION:
3080         pedwarn (input_location, 0,
3081                  "explicit conversion operators "
3082                  "only available with -std=c++0x or -std=gnu++0x");
3083         break;
3084       case CPP0X_VARIADIC_TEMPLATES:
3085         pedwarn (input_location, 0,
3086                  "variadic templates "
3087                  "only available with -std=c++0x or -std=gnu++0x");
3088         break;
3089       case CPP0X_LAMBDA_EXPR:
3090         pedwarn (input_location, 0,
3091                  "lambda expressions "
3092                   "only available with -std=c++0x or -std=gnu++0x");
3093         break;
3094       case CPP0X_AUTO:
3095         pedwarn (input_location, 0,
3096                  "C++0x auto only available with -std=c++0x or -std=gnu++0x");
3097         break;
3098       case CPP0X_SCOPED_ENUMS:
3099         pedwarn (input_location, 0,
3100                  "scoped enums only available with -std=c++0x or -std=gnu++0x");
3101         break;
3102       case CPP0X_DEFAULTED_DELETED:
3103         pedwarn (input_location, 0,
3104                  "defaulted and deleted functions "
3105                  "only available with -std=c++0x or -std=gnu++0x");
3106         break;
3107       case CPP0X_INLINE_NAMESPACES:
3108         pedwarn (input_location, OPT_pedantic,
3109                  "inline namespaces "
3110                  "only available with -std=c++0x or -std=gnu++0x");
3111         break;
3112       default:
3113         gcc_unreachable();
3114       }
3115 }
3116
3117 /* Warn about the use of variadic templates when appropriate.  */
3118 void
3119 maybe_warn_variadic_templates (void)
3120 {
3121   maybe_warn_cpp0x (CPP0X_VARIADIC_TEMPLATES);
3122 }
3123
3124
3125 /* Issue an ISO C++98 pedantic warning at LOCATION, conditional on
3126    option OPT with text GMSGID.  Use this function to report
3127    diagnostics for constructs that are invalid C++98, but valid
3128    C++0x.  */
3129 bool
3130 pedwarn_cxx98 (location_t location, int opt, const char *gmsgid, ...)
3131 {
3132   diagnostic_info diagnostic;
3133   va_list ap;
3134
3135   va_start (ap, gmsgid);
3136   diagnostic_set_info (&diagnostic, gmsgid, &ap, location,
3137                        (cxx_dialect == cxx98) ? DK_PEDWARN : DK_WARNING);
3138   diagnostic.option_index = opt;
3139   va_end (ap);
3140   return report_diagnostic (&diagnostic);
3141 }