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/* Part of CPP library. (Macro hash table support.)
Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef __GCC_CPPHASH__
#define __GCC_CPPHASH__
/* Structure returned by create_definition */
typedef struct macrodef MACRODEF;
struct macrodef
{
struct definition *defn;
const U_CHAR *symnam;
int symlen;
};
/* Structure allocated for every #define. For a simple replacement
such as
#define foo bar ,
nargs = -1, the `pattern' list is null, and the expansion is just
the replacement text. Nargs = 0 means a functionlike macro with no args,
e.g.,
#define getchar() getc (stdin) .
When there are args, the expansion is the replacement text with the
args squashed out, and the reflist is a list describing how to
build the output from the input: e.g., "3 chars, then the 1st arg,
then 9 chars, then the 3rd arg, then 0 chars, then the 2nd arg".
The chars here come from the expansion. Whatever is left of the
expansion after the last arg-occurrence is copied after that arg.
Note that the reflist can be arbitrarily long---
its length depends on the number of times the arguments appear in
the replacement text, not how many args there are. Example:
#define f(x) x+x+x+x+x+x+x would have replacement text "++++++" and
pattern list
{ (0, 1), (1, 1), (1, 1), ..., (1, 1), NULL }
where (x, y) means (nchars, argno). */
typedef struct definition DEFINITION;
struct definition {
int nargs;
int length; /* length of expansion string */
unsigned char *expansion;
int line; /* Line number of definition */
const char *file; /* File of definition */
char rest_args; /* Nonzero if last arg. absorbs the rest */
struct reflist {
struct reflist *next;
char stringify; /* nonzero if this arg was preceded by a
# operator. */
char raw_before; /* Nonzero if a ## operator before arg. */
char raw_after; /* Nonzero if a ## operator after arg. */
char rest_args; /* Nonzero if this arg. absorbs the rest */
int nchars; /* Number of literal chars to copy before
this arg occurrence. */
int argno; /* Number of arg to substitute (origin-0) */
} *pattern;
/* Names of macro args, concatenated in reverse order
with comma-space between them.
The only use of this is that we warn on redefinition
if this differs between the old and new definitions. */
unsigned char *argnames;
};
/* different kinds of things that can appear in the value field
of a hash node. */
union hashval
{
const char *cpval; /* some predefined macros */
DEFINITION *defn; /* #define */
struct hashnode *aschain; /* #assert */
};
typedef struct hashnode HASHNODE;
struct hashnode {
struct hashnode *next; /* double links for easy deletion */
struct hashnode *prev;
struct hashnode **bucket_hdr; /* also, a back pointer to this node's hash
chain is kept, in case the node is the head
of the chain and gets deleted. */
enum node_type type; /* type of special token */
int length; /* length of token, for quick comparison */
U_CHAR *name; /* the actual name */
union hashval value; /* pointer to expansion, or whatever */
};
extern HASHNODE *cpp_install PARAMS ((cpp_reader *, const U_CHAR *, int,
enum node_type, const char *));
extern HASHNODE *cpp_lookup PARAMS ((cpp_reader *, const U_CHAR *, int));
extern void free_definition PARAMS ((DEFINITION *));
extern void delete_macro PARAMS ((HASHNODE *));
extern MACRODEF create_definition PARAMS ((U_CHAR *, U_CHAR *,
cpp_reader *));
extern int compare_defs PARAMS ((cpp_reader *, DEFINITION *,
DEFINITION *));
extern void macroexpand PARAMS ((cpp_reader *, HASHNODE *));
extern void dump_definition PARAMS ((cpp_reader *, const U_CHAR *, long,
DEFINITION *));
#endif
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