100 lines
4.0 KiB
C
100 lines
4.0 KiB
C
/* Interface to C preprocessor macro expansion for GDB.
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Copyright (C) 2002-2020 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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gdb::unique_xmalloc_ptr<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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gdb::unique_xmalloc_ptr<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 (const char **lexptr,
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macro_lookup_ftype *lookup_func,
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void *lookup_baton);
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/* Functions to classify characters according to cpp rules. */
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int macro_is_whitespace (int c);
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int macro_is_identifier_nondigit (int c);
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int macro_is_digit (int c);
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/* Stringify STR according to C rules and return an xmalloc'd pointer
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to the result. */
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char *macro_stringify (const char *str);
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#endif /* MACROEXP_H */
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