gdb/namespace.c

   1 /* Code dealing with "using" directives for GDB.
   2    Copyright (C) 2003-2021 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "defs.h"
  20 #include "namespace.h"
  21
  22 /* Add a using directive to USING_DIRECTIVES.  If the using directive
  23    in question has already been added, don't add it twice.
  24
  25    Create a new struct using_direct which imports the namespace SRC
  26    into the scope DEST.  ALIAS is the name of the imported namespace
  27    in the current scope.  If ALIAS is NULL then the namespace is known
  28    by its original name.  DECLARATION is the name if the imported
  29    variable if this is a declaration import (Eg. using A::x), otherwise
  30    it is NULL.  EXCLUDES is a list of names not to import from an
  31    imported module or NULL.  If COPY_NAMES is non-zero, then the
  32    arguments are copied into newly allocated memory so they can be
  33    temporaries.  For EXCLUDES the contents of the vector are copied,
  34    but the pointed to characters are not copied.  */
  35
  36 void
  37 add_using_directive (struct using_direct **using_directives,
  38                      const char *dest,
  39                      const char *src,
  40                      const char *alias,
  41                      const char *declaration,
  42                      const std::vector<const char *> &excludes,
  43                      int copy_names,
  44                      struct obstack *obstack)
  45 {
  46   struct using_direct *current;
  47   struct using_direct *newobj;
  48   int alloc_len;
  49
  50   /* Has it already been added?  */
  51
  52   for (current = *using_directives; current != NULL; current = current->next)
  53     {
  54       int ix;
  55
  56       if (strcmp (current->import_src, src) != 0)
  57         continue;
  58       if (strcmp (current->import_dest, dest) != 0)
  59         continue;
  60       if ((alias == NULL && current->alias != NULL)
  61           || (alias != NULL && current->alias == NULL)
  62           || (alias != NULL && current->alias != NULL
  63               && strcmp (alias, current->alias) != 0))
  64         continue;
  65       if ((declaration == NULL && current->declaration != NULL)
  66           || (declaration != NULL && current->declaration == NULL)
  67           || (declaration != NULL && current->declaration != NULL
  68               && strcmp (declaration, current->declaration) != 0))
  69         continue;
  70
  71       /* Compare the contents of EXCLUDES.  */
  72       for (ix = 0; ix < excludes.size (); ++ix)
  73         if (current->excludes[ix] == NULL
  74             || strcmp (excludes[ix], current->excludes[ix]) != 0)
  75           break;
  76       if (ix < excludes.size () || current->excludes[ix] != NULL)
  77         continue;
  78
  79       /* Parameters exactly match CURRENT.  */
  80       return;
  81     }
  82
  83   alloc_len = (sizeof(*newobj)
  84                + (excludes.size () * sizeof(*newobj->excludes)));
  85   newobj = (struct using_direct *) obstack_alloc (obstack, alloc_len);
  86   memset (newobj, 0, sizeof (*newobj));
  87
  88   if (copy_names)
  89     {
  90       newobj->import_src = obstack_strdup (obstack, src);
  91       newobj->import_dest = obstack_strdup (obstack, dest);
  92     }
  93   else
  94     {
  95       newobj->import_src = src;
  96       newobj->import_dest = dest;
  97     }
  98
  99   if (alias != NULL && copy_names)
 100     newobj->alias = obstack_strdup (obstack, alias);
 101   else
 102     newobj->alias = alias;
 103
 104   if (declaration != NULL && copy_names)
 105     newobj->declaration = obstack_strdup (obstack, declaration);
 106   else
 107     newobj->declaration = declaration;
 108
 109   if (!excludes.empty ())
 110     memcpy (newobj->excludes, excludes.data (),
 111             excludes.size () * sizeof (*newobj->excludes));
 112   newobj->excludes[excludes.size ()] = NULL;
 113
 114   newobj->next = *using_directives;
 115   *using_directives = newobj;
 116 }