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/* Interface to C preprocessor macro expansion for GDB.

   Copyright (C) 2002, 2007, 2008 Free Software Foundation, Inc.

   Contributed by Red Hat, Inc.

   This file is part of GDB.

   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */

#ifndef MACROEXP_H

#define MACROEXP_H

/* A function for looking up preprocessor macro definitions.  Return

   the preprocessor definition of NAME in scope according to BATON, or

   zero if NAME is not defined as a preprocessor macro.

   The caller must not free or modify the definition returned.  It is

   probably unwise for the caller to hold pointers to it for very

   long; it probably lives in some objfile's obstacks.  */

typedef struct macro_definition *(macro_lookup_ftype) (const char *name,

                                                       void *baton);

/* Expand any preprocessor macros in SOURCE, and return the expanded

   text.  Use LOOKUP_FUNC and LOOKUP_FUNC_BATON to find identifiers'

   preprocessor definitions.  SOURCE is a null-terminated string.  The

   result is a null-terminated string, allocated using xmalloc; it is

   the caller's responsibility to free it.  */

char *macro_expand (const char *source,

                    macro_lookup_ftype *lookup_func,

                    void *lookup_func_baton);

/* Expand all preprocessor macro references that appear explicitly in

   SOURCE, but do not expand any new macro references introduced by

   that first level of expansion.  Use LOOKUP_FUNC and

   LOOKUP_FUNC_BATON to find identifiers' preprocessor definitions.

   SOURCE is a null-terminated string.  The result is a

   null-terminated string, allocated using xmalloc; it is the caller's

   responsibility to free it.  */

char *macro_expand_once (const char *source,

                         macro_lookup_ftype *lookup_func,

                         void *lookup_func_baton);

/* If the null-terminated string pointed to by *LEXPTR begins with a

   macro invocation, return the result of expanding that invocation as

   a null-terminated string, and set *LEXPTR to the next character

   after the invocation.  The result is completely expanded; it

   contains no further macro invocations.

   Otherwise, if *LEXPTR does not start with a macro invocation,

   return zero, and leave *LEXPTR unchanged.

   Use LOOKUP_FUNC and LOOKUP_BATON to find macro definitions.

   If this function returns a string, the caller is responsible for

   freeing it, using xfree.

   We need this expand-one-token-at-a-time interface in order to

   accomodate GDB's C expression parser, which may not consume the

   entire string.  When the user enters a command like

      (gdb) break *func+20 if x == 5

   the parser is expected to consume `func+20', and then stop when it

   sees the "if".  But of course, "if" appearing in a character string

   or as part of a larger identifier doesn't count.  So you pretty

   much have to do tokenization to find the end of the string that

   needs to be macro-expanded.  Our C/C++ tokenizer isn't really

   designed to be called by anything but the yacc parser engine.  */

char *macro_expand_next (char **lexptr,

                         macro_lookup_ftype *lookup_func,

                         void *lookup_baton);

#endif /* MACROEXP_H */