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e37ddb8250
Enum constants can be used as array sizes; if the enum itself does not
appear in the symbol expansion, a change in the enum constant will go
unnoticed. Example patch that changes the ABI but does not change the
checksum with current genksyms:
| enum e {
| E1,
| E2,
|+ E3,
| E_MAX
| };
|
| struct s {
| int a[E_MAX];
| }
|
| int f(struct s *s) { ... }
| EXPORT_SYMBOL(f)
Therefore, remember the value of each enum constant and
expand each occurence to <constant> <value>. The value is not actually
computed, but instead an expression in the form
(last explicitly assigned value) + N
is used. This avoids having to parse and semantically understand whole
of C.
Note: The changes won't take effect until the lexer and parser are
rebuilt by the next patch.
Signed-off-by: Michal Marek <mmarek@suse.cz>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/* Generate kernel symbol version hashes.
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Copyright 1996, 1997 Linux International.
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New implementation contributed by Richard Henderson <rth@tamu.edu>
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Based on original work by Bjorn Ekwall <bj0rn@blox.se>
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This file is part of the Linux modutils.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef MODUTILS_GENKSYMS_H
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#define MODUTILS_GENKSYMS_H 1
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#include <stdio.h>
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enum symbol_type {
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SYM_NORMAL, SYM_TYPEDEF, SYM_ENUM, SYM_STRUCT, SYM_UNION,
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SYM_ENUM_CONST
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};
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enum symbol_status {
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STATUS_UNCHANGED, STATUS_DEFINED, STATUS_MODIFIED
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};
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struct string_list {
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struct string_list *next;
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enum symbol_type tag;
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char *string;
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};
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struct symbol {
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struct symbol *hash_next;
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const char *name;
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enum symbol_type type;
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struct string_list *defn;
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struct symbol *expansion_trail;
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struct symbol *visited;
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int is_extern;
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int is_declared;
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enum symbol_status status;
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int is_override;
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};
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typedef struct string_list **yystype;
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#define YYSTYPE yystype
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extern int cur_line;
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extern char *cur_filename;
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struct symbol *find_symbol(const char *name, enum symbol_type ns, int exact);
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struct symbol *add_symbol(const char *name, enum symbol_type type,
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struct string_list *defn, int is_extern);
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void export_symbol(const char *);
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void free_node(struct string_list *list);
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void free_list(struct string_list *s, struct string_list *e);
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struct string_list *copy_node(struct string_list *);
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struct string_list *copy_list_range(struct string_list *start,
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struct string_list *end);
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int yylex(void);
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int yyparse(void);
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void error_with_pos(const char *, ...);
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/*----------------------------------------------------------------------*/
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#define xmalloc(size) ({ void *__ptr = malloc(size); \
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if(!__ptr && size != 0) { \
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fprintf(stderr, "out of memory\n"); \
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exit(1); \
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} \
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__ptr; })
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#define xstrdup(str) ({ char *__str = strdup(str); \
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if (!__str) { \
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fprintf(stderr, "out of memory\n"); \
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exit(1); \
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} \
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__str; })
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#endif /* genksyms.h */
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