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9ab55d7f24
The C11 _Static_assert() keyword may be used at module scope, and we
need to teach genksyms about it to not abort with an error. We currently
have a growing number of static_assert() (but also direct usage of
_Static_assert()) users at module scope:
git grep -E '^_Static_assert\(|^static_assert\(' | grep -v '^tools' | wc -l
135
More recently, when enabling CONFIG_MODVERSIONS with CONFIG_KCSAN, we
observe a number of warnings:
WARNING: modpost: EXPORT symbol "<..all kcsan symbols..>" [vmlinux] [...]
When running a preprocessed source through 'genksyms -w' a number of
syntax errors point at usage of static_assert()s. In the case of
kernel/kcsan/encoding.h, new static_assert()s had been introduced which
used expressions that appear to cause genksyms to not even be able to
recover from the syntax error gracefully (as it appears was the case
previously).
Therefore, make genksyms ignore all _Static_assert() and the contained
expression. With the fix, usage of _Static_assert() no longer cause
"syntax error" all over the kernel, and the above modpost warnings for
KCSAN are gone, too.
Signed-off-by: Marco Elver <elver@google.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
495 lines
9.1 KiB
Plaintext
495 lines
9.1 KiB
Plaintext
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Lexical analysis for genksyms.
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* Copyright 1996, 1997 Linux International.
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*
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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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*
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* Taken from Linux modutils 2.4.22.
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*/
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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.tab.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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cur_node->in_source_file = in_source_file; \
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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_TYPEOF, ST_TYPEOF_1,
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ST_BRACKET, ST_BRACE, ST_EXPRESSION, ST_STATIC_ASSERT,
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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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if (!source_file) {
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source_file = xstrdup(cur_filename);
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in_source_file = 1;
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} else {
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in_source_file = (strcmp(cur_filename, source_file) == 0);
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}
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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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int r = is_reserved_word(yytext, yyleng);
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if (r >= 0)
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{
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switch (token = r)
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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 TYPEOF_KEYW:
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lexstate = ST_TYPEOF;
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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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case STATIC_ASSERT_KEYW:
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lexstate = ST_STATIC_ASSERT;
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count = 0;
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goto repeat;
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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_TYPEOF_1:
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if (token == IDENT)
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{
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if (is_reserved_word(yytext, yyleng) >= 0
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|| find_symbol(yytext, SYM_TYPEDEF, 1))
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{
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yyless(0);
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unput('(');
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lexstate = ST_NORMAL;
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token = TYPEOF_KEYW;
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break;
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}
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_APP("(", 1);
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}
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lexstate = ST_TYPEOF;
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/* FALLTHRU */
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case ST_TYPEOF:
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switch (token)
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{
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case '(':
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if ( ++count == 1 )
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lexstate = ST_TYPEOF_1;
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else
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APP;
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goto repeat;
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case ')':
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APP;
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if (--count == 0)
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{
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lexstate = ST_NORMAL;
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token = TYPEOF_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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APP;
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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_STATIC_ASSERT:
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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 = STATIC_ASSERT_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_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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