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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [macroexp.h] - Blame information for rev 157

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1 24 jeremybenn
/* Interface to C preprocessor macro expansion for GDB.
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   Copyright (C) 2002, 2007, 2008 Free Software Foundation, Inc.
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   Contributed by Red Hat, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#ifndef MACROEXP_H
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#define MACROEXP_H
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/* A function for looking up preprocessor macro definitions.  Return
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   the preprocessor definition of NAME in scope according to BATON, or
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   zero if NAME is not defined as a preprocessor macro.
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   The caller must not free or modify the definition returned.  It is
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   probably unwise for the caller to hold pointers to it for very
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   long; it probably lives in some objfile's obstacks.  */
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typedef struct macro_definition *(macro_lookup_ftype) (const char *name,
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                                                       void *baton);
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/* Expand any preprocessor macros in SOURCE, and return the expanded
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   text.  Use LOOKUP_FUNC and LOOKUP_FUNC_BATON to find identifiers'
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   preprocessor definitions.  SOURCE is a null-terminated string.  The
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   result is a null-terminated string, allocated using xmalloc; it is
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   the caller's responsibility to free it.  */
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char *macro_expand (const char *source,
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                    macro_lookup_ftype *lookup_func,
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                    void *lookup_func_baton);
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/* Expand all preprocessor macro references that appear explicitly in
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   SOURCE, but do not expand any new macro references introduced by
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   that first level of expansion.  Use LOOKUP_FUNC and
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   LOOKUP_FUNC_BATON to find identifiers' preprocessor definitions.
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   SOURCE is a null-terminated string.  The result is a
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   null-terminated string, allocated using xmalloc; it is the caller's
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   responsibility to free it.  */
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char *macro_expand_once (const char *source,
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                         macro_lookup_ftype *lookup_func,
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                         void *lookup_func_baton);
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/* If the null-terminated string pointed to by *LEXPTR begins with a
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   macro invocation, return the result of expanding that invocation as
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   a null-terminated string, and set *LEXPTR to the next character
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   after the invocation.  The result is completely expanded; it
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   contains no further macro invocations.
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   Otherwise, if *LEXPTR does not start with a macro invocation,
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   return zero, and leave *LEXPTR unchanged.
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   Use LOOKUP_FUNC and LOOKUP_BATON to find macro definitions.
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   If this function returns a string, the caller is responsible for
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   freeing it, using xfree.
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   We need this expand-one-token-at-a-time interface in order to
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   accomodate GDB's C expression parser, which may not consume the
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   entire string.  When the user enters a command like
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      (gdb) break *func+20 if x == 5
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   the parser is expected to consume `func+20', and then stop when it
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   sees the "if".  But of course, "if" appearing in a character string
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   or as part of a larger identifier doesn't count.  So you pretty
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   much have to do tokenization to find the end of the string that
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   needs to be macro-expanded.  Our C/C++ tokenizer isn't really
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   designed to be called by anything but the yacc parser engine.  */
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char *macro_expand_next (char **lexptr,
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                         macro_lookup_ftype *lookup_func,
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                         void *lookup_baton);
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#endif /* MACROEXP_H */

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