[2/6] vfprintf: Introduce JUMP_TABLE_BASE_LABEL
Commit Message
This makes the offset handling more explicit and avoids
cross-references between the jump tables.
---
stdio-common/vfprintf.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
Comments
Florian Weimer <fweimer@redhat.com> writes:
> @@ -1897,7 +1898,9 @@ do_positional:
> {
> #undef REF
> #ifdef SHARED
> -# define REF(Name) &&do2_##Name - &&do_form_unknown
> +# undef JUMP_TABLE_BASE_LABEL
> +# define JUMP_TABLE_BASE_LABEL do2_form_unknown
Where do you define that label?
Andreas.
On 03/01/2015 11:36 PM, Andreas Schwab wrote:
> Florian Weimer <fweimer@redhat.com> writes:
>
>> @@ -1897,7 +1898,9 @@ do_positional:
>> {
>> #undef REF
>> #ifdef SHARED
>> -# define REF(Name) &&do2_##Name - &&do_form_unknown
>> +# undef JUMP_TABLE_BASE_LABEL
>> +# define JUMP_TABLE_BASE_LABEL do2_form_unknown
>
> Where do you define that label?
Its name is generated with the LABEL macro:
#define LABEL(Name) do2_##Name
and eventually defined by the STEP4_TABLE macro.
Florian Weimer wrote:
> +# define REF(Name) &&do_##Name - &&JUMP_TABLE_BASE_LABEL
...
> +# define REF(Name) &&do2_##Name - &&JUMP_TABLE_BASE_LABEL
The definientia should be parenthesized.
On 03/03/2015 03:00 AM, Paul Eggert wrote:
> Florian Weimer wrote:
>> +# define REF(Name) &&do_##Name - &&JUMP_TABLE_BASE_LABEL
> ...
>> +# define REF(Name) &&do2_##Name - &&JUMP_TABLE_BASE_LABEL
>
> The definientia should be parenthesized.
Committed with this change.
@@ -304,7 +304,7 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap)
spec = (ChExpr); \
offset = NOT_IN_JUMP_RANGE (spec) ? REF (form_unknown) \
: table[CHAR_CLASS (spec)]; \
- ptr = &&do_form_unknown + offset; \
+ ptr = &&JUMP_TABLE_BASE_LABEL + offset; \
goto *ptr; \
} \
while (0)
@@ -1329,7 +1329,8 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap)
do
{
#ifdef SHARED
-# define REF(Name) &&do_##Name - &&do_form_unknown
+# define JUMP_TABLE_BASE_LABEL do_form_unknown
+# define REF(Name) &&do_##Name - &&JUMP_TABLE_BASE_LABEL
#else
# define REF(Name) &&do_##Name
#endif
@@ -1897,7 +1898,9 @@ do_positional:
{
#undef REF
#ifdef SHARED
-# define REF(Name) &&do2_##Name - &&do_form_unknown
+# undef JUMP_TABLE_BASE_LABEL
+# define JUMP_TABLE_BASE_LABEL do2_form_unknown
+# define REF(Name) &&do2_##Name - &&JUMP_TABLE_BASE_LABEL
#else
# define REF(Name) &&do2_##Name
#endif