* cppfiles.c (stack_include_file): Don't optimize zero-length

[thirdparty/gcc.git] / gcc / langhooks.h

/* The lang_hooks data structure.
   Copyright 2001 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifndef GCC_LANG_HOOKS_H
#define GCC_LANG_HOOKS_H

/* A print hook for print_tree ().  */
typedef void (*lang_print_tree_hook) PARAMS ((FILE *, tree, int indent));

/* The following hooks are documented in langhooks.c.  Must not be
   NULL.  */

struct lang_hooks_for_tree_inlining
{
  union tree_node *(*walk_subtrees) PARAMS ((union tree_node **, int *,
					     union tree_node *(*)
					     (union tree_node **,
					      int *, void *),
					     void *, void *));
  int (*cannot_inline_tree_fn) PARAMS ((union tree_node **));
  int (*disregard_inline_limits) PARAMS ((union tree_node *));
  union tree_node *(*add_pending_fn_decls) PARAMS ((void *,
						    union tree_node *));
  int (*tree_chain_matters_p) PARAMS ((union tree_node *));
  int (*auto_var_in_fn_p) PARAMS ((union tree_node *, union tree_node *));
  union tree_node *(*copy_res_decl_for_inlining) PARAMS ((union tree_node *,
							  union tree_node *,
							  union tree_node *,
							  void *, int *,
							  void *));
  int (*anon_aggr_type_p) PARAMS ((union tree_node *));
};

/* The following hooks are used by tree-dump.c.  */

struct lang_hooks_for_tree_dump
{
  /* Dump language-specific parts of tree nodes.  Returns non-zero if it 
     does not want the usual dumping of the second argument.  */
  int (*dump_tree) PARAMS ((void *, tree));

  /* Determine type qualifiers in a language-specific way.  */
  int (*type_quals) PARAMS ((tree));
};

/* Language-specific hooks.  See langhooks-def.h for defaults.  */

struct lang_hooks
{
  /* String identifying the front end.  e.g. "GNU C++".  */
  const char *name;

  /* sizeof (struct lang_identifier), so make_node () creates
     identifier nodes long enough for the language-specific slots.  */
  size_t identifier_size;

  /* The first callback made to the front end, for simple
     initialization needed before any calls to decode_option.  */
  void (*init_options) PARAMS ((void));

  /* Function called with an option vector as argument, to decode a
     single option (typically starting with -f or -W or +).  It should
     return the number of command-line arguments it uses if it handles
     the option, or 0 and not complain if it does not recognise the
     option.  If this function returns a negative number, then its
     absolute value is the number of command-line arguments used, but,
     in addition, no language-independent option processing should be
     done for this option.  */
  int (*decode_option) PARAMS ((int, char **));

  /* Called when all command line options have been parsed.  Should do
     any required consistency checks, modifications etc.  Complex
     initialization should be left to the "init" callback, since GC
     and the identifier hashes are set up between now and then.  */
  void (*post_options) PARAMS ((void));

  /* Called after post_options, to initialize the front end.  The main
     input filename is passed, which may be NULL; the front end should
     return the original filename (e.g. foo.i -> foo.c).  Return NULL
     to indicate a serious error of some sort; in that case no
     compilation is performed, and the finish hook is called
     immediately.  */
  const char * (*init) PARAMS ((const char *));

  /* Called at the end of compilation, as a finalizer.  */
  void (*finish) PARAMS ((void));

  /* Called immediately after parsing to clear the binding stack.  */
  void (*clear_binding_stack) PARAMS ((void));

  /* Called to obtain the alias set to be used for an expression or type.
     Returns -1 if the language does nothing special for it.  */
  HOST_WIDE_INT (*get_alias_set) PARAMS ((tree));

  /* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored.  */
  bool honor_readonly;

  /* The front end can add its own statistics to -fmem-report with
     this hook.  It should output to stderr.  */
  void (*print_statistics) PARAMS ((void));

  /* Called by print_tree when there is a tree of class 'x' that it
     doesn't know how to display.  */
  lang_print_tree_hook print_xnode;

  /* Called to print language-dependent parts of a class 'd', class
     't', and IDENTIFIER_NODE nodes.  */
  lang_print_tree_hook print_decl;
  lang_print_tree_hook print_type;
  lang_print_tree_hook print_identifier;

  /* Set yydebug for bison-based parsers, when -dy is given on the
     command line.  By default, if the parameter is non-zero, prints a
     warning that the front end does not use such a parser.  */
  void (*set_yydebug) PARAMS ((int));

  struct lang_hooks_for_tree_inlining tree_inlining;
  
  struct lang_hooks_for_tree_dump tree_dump;

  /* Whenever you add entries here, make sure you adjust langhooks-def.h
     and langhooks.c accordingly.  */
};

/* Each front end provides its own.  */
extern const struct lang_hooks lang_hooks;

#endif /* GCC_LANG_HOOKS_H */