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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-12-11 14:00:53 +0300 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-12-15 11:45:20 +0300 |
| commit | 2f60e46e605a9bcd8dc4fe7745b5576084900850 (patch) | |
| tree | b65340cd102494113ba4931c2837e914454a660d /scripts/kconfig/zconf.y | |
| parent | 6900ae9eeee397436df25ef51835a8b27865d46d (diff) | |
| download | linux-2f60e46e605a9bcd8dc4fe7745b5576084900850.tar.xz | |
kconfig: remove grammatically ambiguous option_error
This commit decreases 6 shift/reduce conflicts, and finally achieves
conflict-free parser.
Since Kconfig has no terminator for a config block, detecting the end
of config_stmt is not easy.
For example, there are two ways for handling the error in the following
code:
1 config FOO
2 =
[A] Print "unknown option" error, assuming the line 2 is a part of
config_option_list
[B] Print "invalid statement", assuming the line 1 is reduced into
a config_stmt by itself
Bison actually chooses [A] because it performs the shift rather than
the reduction where both are possible.
However, there is no reason to choose one over the other.
Let's remove the option_error, and let it fall back to [B].
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'scripts/kconfig/zconf.y')
| -rw-r--r-- | scripts/kconfig/zconf.y | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y index cef6123228c0..a92f167e8267 100644 --- a/scripts/kconfig/zconf.y +++ b/scripts/kconfig/zconf.y @@ -31,7 +31,6 @@ struct symbol *symbol_hash[SYMBOL_HASHSIZE]; static struct menu *current_menu, *current_entry; %} -%expect 6 %union { @@ -138,12 +137,6 @@ common_stmt: | assignment_stmt ; -option_error: - T_WORD error T_EOL { zconf_error("unknown option \"%s\"", $1); } - | error T_EOL { zconf_error("invalid option"); } -; - - /* config/menuconfig entry */ config_entry_start: T_CONFIG nonconst_symbol T_EOL @@ -180,7 +173,6 @@ config_option_list: | config_option_list symbol_option | config_option_list depends | config_option_list help - | config_option_list option_error ; config_option: T_TYPE prompt_stmt_opt T_EOL @@ -280,7 +272,6 @@ choice_option_list: | choice_option_list choice_option | choice_option_list depends | choice_option_list help - | choice_option_list option_error ; choice_option: T_PROMPT prompt if_expr T_EOL @@ -429,7 +420,6 @@ help: help_start T_HELPTEXT depends_list: /* empty */ | depends_list depends - | depends_list option_error ; depends: T_DEPENDS T_ON expr T_EOL |