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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>
428 lines
8.4 KiB
Plaintext
428 lines
8.4 KiB
Plaintext
/* Lexical analysis for genksyms.
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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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Taken from Linux modutils 2.4.22.
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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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%{
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "genksyms.h"
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#include "parse.h"
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/* We've got a two-level lexer here. We let flex do basic tokenization
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and then we categorize those basic tokens in the second stage. */
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#define YY_DECL static int yylex1(void)
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%}
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IDENT [A-Za-z_\$][A-Za-z0-9_\$]*
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O_INT 0[0-7]*
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D_INT [1-9][0-9]*
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X_INT 0[Xx][0-9A-Fa-f]+
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I_SUF [Uu]|[Ll]|[Uu][Ll]|[Ll][Uu]
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INT ({O_INT}|{D_INT}|{X_INT}){I_SUF}?
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FRAC ([0-9]*\.[0-9]+)|([0-9]+\.)
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EXP [Ee][+-]?[0-9]+
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F_SUF [FfLl]
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REAL ({FRAC}{EXP}?{F_SUF}?)|([0-9]+{EXP}{F_SUF}?)
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STRING L?\"([^\\\"]*\\.)*[^\\\"]*\"
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CHAR L?\'([^\\\']*\\.)*[^\\\']*\'
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MC_TOKEN ([~%^&*+=|<>/-]=)|(&&)|("||")|(->)|(<<)|(>>)
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/* We don't do multiple input files. */
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%option noyywrap
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%option noinput
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%%
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/* Keep track of our location in the original source files. */
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^#[ \t]+{INT}[ \t]+\"[^\"\n]+\".*\n return FILENAME;
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^#.*\n cur_line++;
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\n cur_line++;
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/* Ignore all other whitespace. */
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[ \t\f\v\r]+ ;
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{STRING} return STRING;
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{CHAR} return CHAR;
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{IDENT} return IDENT;
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/* The Pedant requires that the other C multi-character tokens be
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recognized as tokens. We don't actually use them since we don't
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parse expressions, but we do want whitespace to be arranged
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around them properly. */
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{MC_TOKEN} return OTHER;
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{INT} return INT;
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{REAL} return REAL;
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"..." return DOTS;
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/* All other tokens are single characters. */
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. return yytext[0];
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%%
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/* Bring in the keyword recognizer. */
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#include "keywords.c"
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/* Macros to append to our phrase collection list. */
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/*
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* We mark any token, that that equals to a known enumerator, as
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* SYM_ENUM_CONST. The parser will change this for struct and union tags later,
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* the only problem is struct and union members:
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* enum e { a, b }; struct s { int a, b; }
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* but in this case, the only effect will be, that the ABI checksums become
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* more volatile, which is acceptable. Also, such collisions are quite rare,
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* so far it was only observed in include/linux/telephony.h.
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*/
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#define _APP(T,L) do { \
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cur_node = next_node; \
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next_node = xmalloc(sizeof(*next_node)); \
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next_node->next = cur_node; \
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cur_node->string = memcpy(xmalloc(L+1), T, L+1); \
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cur_node->tag = \
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find_symbol(cur_node->string, SYM_ENUM_CONST, 1)?\
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SYM_ENUM_CONST : SYM_NORMAL ; \
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} while (0)
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#define APP _APP(yytext, yyleng)
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/* The second stage lexer. Here we incorporate knowledge of the state
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of the parser to tailor the tokens that are returned. */
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int
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yylex(void)
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{
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static enum {
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ST_NOTSTARTED, ST_NORMAL, ST_ATTRIBUTE, ST_ASM, ST_BRACKET, ST_BRACE,
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ST_EXPRESSION, ST_TABLE_1, ST_TABLE_2, ST_TABLE_3, ST_TABLE_4,
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ST_TABLE_5, ST_TABLE_6
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} lexstate = ST_NOTSTARTED;
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static int suppress_type_lookup, dont_want_brace_phrase;
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static struct string_list *next_node;
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int token, count = 0;
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struct string_list *cur_node;
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if (lexstate == ST_NOTSTARTED)
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{
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next_node = xmalloc(sizeof(*next_node));
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next_node->next = NULL;
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lexstate = ST_NORMAL;
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}
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repeat:
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token = yylex1();
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if (token == 0)
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return 0;
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else if (token == FILENAME)
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{
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char *file, *e;
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/* Save the filename and line number for later error messages. */
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if (cur_filename)
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free(cur_filename);
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file = strchr(yytext, '\"')+1;
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e = strchr(file, '\"');
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*e = '\0';
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cur_filename = memcpy(xmalloc(e-file+1), file, e-file+1);
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cur_line = atoi(yytext+2);
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goto repeat;
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}
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switch (lexstate)
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{
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case ST_NORMAL:
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switch (token)
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{
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case IDENT:
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APP;
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{
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const struct resword *r = is_reserved_word(yytext, yyleng);
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if (r)
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{
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switch (token = r->token)
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{
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case ATTRIBUTE_KEYW:
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lexstate = ST_ATTRIBUTE;
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count = 0;
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goto repeat;
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case ASM_KEYW:
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lexstate = ST_ASM;
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count = 0;
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goto repeat;
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case STRUCT_KEYW:
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case UNION_KEYW:
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case ENUM_KEYW:
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dont_want_brace_phrase = 3;
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suppress_type_lookup = 2;
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goto fini;
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case EXPORT_SYMBOL_KEYW:
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goto fini;
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}
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}
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if (!suppress_type_lookup)
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{
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if (find_symbol(yytext, SYM_TYPEDEF, 1))
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token = TYPE;
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}
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}
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break;
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case '[':
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APP;
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lexstate = ST_BRACKET;
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count = 1;
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goto repeat;
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case '{':
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APP;
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if (dont_want_brace_phrase)
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break;
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lexstate = ST_BRACE;
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count = 1;
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goto repeat;
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case '=': case ':':
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APP;
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lexstate = ST_EXPRESSION;
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break;
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case DOTS:
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default:
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APP;
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break;
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}
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break;
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case ST_ATTRIBUTE:
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APP;
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switch (token)
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{
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case '(':
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++count;
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goto repeat;
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case ')':
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if (--count == 0)
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{
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lexstate = ST_NORMAL;
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token = ATTRIBUTE_PHRASE;
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break;
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}
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goto repeat;
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default:
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goto repeat;
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}
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break;
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case ST_ASM:
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APP;
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switch (token)
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{
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case '(':
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++count;
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goto repeat;
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case ')':
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if (--count == 0)
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{
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lexstate = ST_NORMAL;
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token = ASM_PHRASE;
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break;
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}
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goto repeat;
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default:
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goto repeat;
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}
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break;
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case ST_BRACKET:
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APP;
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switch (token)
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{
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case '[':
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++count;
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goto repeat;
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case ']':
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if (--count == 0)
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{
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lexstate = ST_NORMAL;
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token = BRACKET_PHRASE;
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break;
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}
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goto repeat;
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default:
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goto repeat;
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}
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break;
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case ST_BRACE:
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APP;
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switch (token)
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{
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case '{':
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++count;
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goto repeat;
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case '}':
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if (--count == 0)
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{
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lexstate = ST_NORMAL;
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token = BRACE_PHRASE;
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break;
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}
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goto repeat;
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default:
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goto repeat;
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}
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break;
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case ST_EXPRESSION:
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switch (token)
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{
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case '(': case '[': case '{':
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++count;
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APP;
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goto repeat;
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case '}':
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/* is this the last line of an enum declaration? */
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if (count == 0)
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{
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/* Put back the token we just read so's we can find it again
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after registering the expression. */
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unput(token);
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lexstate = ST_NORMAL;
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token = EXPRESSION_PHRASE;
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break;
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}
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/* FALLTHRU */
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case ')': case ']':
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--count;
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APP;
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goto repeat;
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case ',': case ';':
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if (count == 0)
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{
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/* Put back the token we just read so's we can find it again
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after registering the expression. */
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unput(token);
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lexstate = ST_NORMAL;
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token = EXPRESSION_PHRASE;
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break;
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}
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APP;
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goto repeat;
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default:
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APP;
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goto repeat;
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}
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break;
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case ST_TABLE_1:
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goto repeat;
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case ST_TABLE_2:
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if (token == IDENT && yyleng == 1 && yytext[0] == 'X')
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{
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token = EXPORT_SYMBOL_KEYW;
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lexstate = ST_TABLE_5;
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APP;
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break;
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}
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lexstate = ST_TABLE_6;
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/* FALLTHRU */
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case ST_TABLE_6:
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switch (token)
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{
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case '{': case '[': case '(':
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++count;
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break;
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case '}': case ']': case ')':
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--count;
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break;
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case ',':
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if (count == 0)
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lexstate = ST_TABLE_2;
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break;
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};
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goto repeat;
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case ST_TABLE_3:
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goto repeat;
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case ST_TABLE_4:
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if (token == ';')
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lexstate = ST_NORMAL;
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goto repeat;
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case ST_TABLE_5:
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switch (token)
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{
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case ',':
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token = ';';
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lexstate = ST_TABLE_2;
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APP;
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break;
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default:
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APP;
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break;
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}
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break;
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default:
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exit(1);
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}
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fini:
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if (suppress_type_lookup > 0)
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--suppress_type_lookup;
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if (dont_want_brace_phrase > 0)
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--dont_want_brace_phrase;
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yylval = &next_node->next;
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return token;
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}
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