gcc/langhooks.h

   1 /* The lang_hooks data structure.
   2    Copyright 2001 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC 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 2, or (at your option)
   9 any later version.
  10
  11 GNU CC 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 GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef GCC_LANG_HOOKS_H
  22 #define GCC_LANG_HOOKS_H
  23
  24 /* A print hook for print_tree ().  */
  25 typedef void (*lang_print_tree_hook) PARAMS ((FILE *, tree, int indent));
  26
  27 /* The following hooks are documented in langhooks.c.  Must not be
  28    NULL.  */
  29
  30 struct lang_hooks_for_tree_inlining
  31 {
  32   union tree_node *(*walk_subtrees) PARAMS ((union tree_node **, int *,
  33                                              union tree_node *(*)
  34                                              (union tree_node **,
  35                                               int *, void *),
  36                                              void *, void *));
  37   int (*cannot_inline_tree_fn) PARAMS ((union tree_node **));
  38   int (*disregard_inline_limits) PARAMS ((union tree_node *));
  39   union tree_node *(*add_pending_fn_decls) PARAMS ((void *,
  40                                                     union tree_node *));
  41   int (*tree_chain_matters_p) PARAMS ((union tree_node *));
  42   int (*auto_var_in_fn_p) PARAMS ((union tree_node *, union tree_node *));
  43   union tree_node *(*copy_res_decl_for_inlining) PARAMS ((union tree_node *,
  44                                                           union tree_node *,
  45                                                           union tree_node *,
  46                                                           void *, int *,
  47                                                           void *));
  48   int (*anon_aggr_type_p) PARAMS ((union tree_node *));
  49   int (*start_inlining) PARAMS ((union tree_node *));
  50   void (*end_inlining) PARAMS ((union tree_node *));
  51 };
  52
  53 /* The following hooks are used by tree-dump.c.  */
  54
  55 struct lang_hooks_for_tree_dump
  56 {
  57   /* Dump language-specific parts of tree nodes.  Returns non-zero if it
  58      does not want the usual dumping of the second argument.  */
  59   int (*dump_tree) PARAMS ((void *, tree));
  60
  61   /* Determine type qualifiers in a language-specific way.  */
  62   int (*type_quals) PARAMS ((tree));
  63 };
  64
  65 /* Language-specific hooks.  See langhooks-def.h for defaults.  */
  66
  67 struct lang_hooks
  68 {
  69   /* String identifying the front end.  e.g. "GNU C++".  */
  70   const char *name;
  71
  72   /* sizeof (struct lang_identifier), so make_node () creates
  73      identifier nodes long enough for the language-specific slots.  */
  74   size_t identifier_size;
  75
  76   /* The first callback made to the front end, for simple
  77      initialization needed before any calls to decode_option.  */
  78   void (*init_options) PARAMS ((void));
  79
  80   /* Function called with an option vector as argument, to decode a
  81      single option (typically starting with -f or -W or +).  It should
  82      return the number of command-line arguments it uses if it handles
  83      the option, or 0 and not complain if it does not recognise the
  84      option.  If this function returns a negative number, then its
  85      absolute value is the number of command-line arguments used, but,
  86      in addition, no language-independent option processing should be
  87      done for this option.  */
  88   int (*decode_option) PARAMS ((int, char **));
  89
  90   /* Called when all command line options have been parsed.  Should do
  91      any required consistency checks, modifications etc.  Complex
  92      initialization should be left to the "init" callback, since GC
  93      and the identifier hashes are set up between now and then.  */
  94   void (*post_options) PARAMS ((void));
  95
  96   /* Called after post_options, to initialize the front end.  The main
  97      input filename is passed, which may be NULL; the front end should
  98      return the original filename (e.g. foo.i -> foo.c).  Return NULL
  99      to indicate a serious error of some sort; in that case no
 100      compilation is performed, and the finish hook is called
 101      immediately.  */
 102   const char * (*init) PARAMS ((const char *));
 103
 104   /* Called at the end of compilation, as a finalizer.  */
 105   void (*finish) PARAMS ((void));
 106
 107   /* Called immediately after parsing to clear the binding stack.  */
 108   void (*clear_binding_stack) PARAMS ((void));
 109
 110   /* Called to obtain the alias set to be used for an expression or type.
 111      Returns -1 if the language does nothing special for it.  */
 112   HOST_WIDE_INT (*get_alias_set) PARAMS ((tree));
 113
 114   /* Called with an expression that is to be processed as a constant.
 115      Returns either the same expression or a language-independent
 116      constant equivalent to its input.  */
 117   tree (*expand_constant) PARAMS ((tree));
 118
 119   /* Hook called by safe_from_p for language-specific tree codes.  It is
 120      up to the language front-end to install a hook if it has any such
 121      codes that safe_from_p needs to know about.  Since same_from_p will
 122      recursively explore the TREE_OPERANDs of an expression, this hook
 123      should not reexamine those pieces.  This routine may recursively
 124      call safe_from_p; it should always pass `0' as the TOP_P
 125      parameter.  */
 126   int (*safe_from_p) PARAMS ((rtx, tree));
 127
 128   /* Hook called by staticp for language-specific tree codes.  */
 129   int (*staticp) PARAMS ((tree));
 130
 131   /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
 132      DECL_NODE with a newly GC-allocated copy.  */
 133   void (*dup_lang_specific_decl) PARAMS ((tree));
 134
 135   /* Called before its argument, an UNSAVE_EXPR, is to be
 136      unsaved.  Modify it in-place so that all the evaluate only once
 137      things are cleared out.  */
 138   tree (*unsave_expr_now) PARAMS ((tree));
 139
 140   /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored.  */
 141   bool honor_readonly;
 142
 143   /* The front end can add its own statistics to -fmem-report with
 144      this hook.  It should output to stderr.  */
 145   void (*print_statistics) PARAMS ((void));
 146
 147   /* Called by print_tree when there is a tree of class 'x' that it
 148      doesn't know how to display.  */
 149   lang_print_tree_hook print_xnode;
 150
 151   /* Called to print language-dependent parts of a class 'd', class
 152      't', and IDENTIFIER_NODE nodes.  */
 153   lang_print_tree_hook print_decl;
 154   lang_print_tree_hook print_type;
 155   lang_print_tree_hook print_identifier;
 156
 157   /* Set yydebug for bison-based parsers, when -dy is given on the
 158      command line.  By default, if the parameter is non-zero, prints a
 159      warning that the front end does not use such a parser.  */
 160   void (*set_yydebug) PARAMS ((int));
 161
 162   struct lang_hooks_for_tree_inlining tree_inlining;
 163
 164   struct lang_hooks_for_tree_dump tree_dump;
 165
 166   /* Whenever you add entries here, make sure you adjust langhooks-def.h
 167      and langhooks.c accordingly.  */
 168 };
 169
 170 /* Each front end provides its own.  */
 171 extern const struct lang_hooks lang_hooks;
 172
 173 #endif /* GCC_LANG_HOOKS_H */