diff options
author | Markus Armbruster <armbru@redhat.com> | 2020-07-07 18:06:02 +0200 |
---|---|---|
committer | Markus Armbruster <armbru@redhat.com> | 2020-07-10 15:18:08 +0200 |
commit | 668f62ec621e4e2919fb7d4caa5d805764c5852d (patch) | |
tree | 8cb4b78b9ab596b0eb573a0cae77ac1893456826 /hw/misc/pca9552.c | |
parent | dcfe480544eef72d666cb1695624449e2c22da2d (diff) |
error: Eliminate error_propagate() with Coccinelle, part 1
When all we do with an Error we receive into a local variable is
propagating to somewhere else, we can just as well receive it there
right away. Convert
if (!foo(..., &err)) {
...
error_propagate(errp, err);
...
return ...
}
to
if (!foo(..., errp)) {
...
...
return ...
}
where nothing else needs @err. Coccinelle script:
@rule1 forall@
identifier fun, err, errp, lbl;
expression list args, args2;
binary operator op;
constant c1, c2;
symbol false;
@@
if (
(
- fun(args, &err, args2)
+ fun(args, errp, args2)
|
- !fun(args, &err, args2)
+ !fun(args, errp, args2)
|
- fun(args, &err, args2) op c1
+ fun(args, errp, args2) op c1
)
)
{
... when != err
when != lbl:
when strict
- error_propagate(errp, err);
... when != err
(
return;
|
return c2;
|
return false;
)
}
@rule2 forall@
identifier fun, err, errp, lbl;
expression list args, args2;
expression var;
binary operator op;
constant c1, c2;
symbol false;
@@
- var = fun(args, &err, args2);
+ var = fun(args, errp, args2);
... when != err
if (
(
var
|
!var
|
var op c1
)
)
{
... when != err
when != lbl:
when strict
- error_propagate(errp, err);
... when != err
(
return;
|
return c2;
|
return false;
|
return var;
)
}
@depends on rule1 || rule2@
identifier err;
@@
- Error *err = NULL;
... when != err
Not exactly elegant, I'm afraid.
The "when != lbl:" is necessary to avoid transforming
if (fun(args, &err)) {
goto out
}
...
out:
error_propagate(errp, err);
even though other paths to label out still need the error_propagate().
For an actual example, see sclp_realize().
Without the "when strict", Coccinelle transforms vfio_msix_setup(),
incorrectly. I don't know what exactly "when strict" does, only that
it helps here.
The match of return is narrower than what I want, but I can't figure
out how to express "return where the operand doesn't use @err". For
an example where it's too narrow, see vfio_intx_enable().
Silently fails to convert hw/arm/armsse.c, because Coccinelle gets
confused by ARMSSE being used both as typedef and function-like macro
there. Converted manually.
Line breaks tidied up manually. One nested declaration of @local_err
deleted manually. Preexisting unwanted blank line dropped in
hw/riscv/sifive_e.c.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200707160613.848843-35-armbru@redhat.com>
Diffstat (limited to 'hw/misc/pca9552.c')
-rw-r--r-- | hw/misc/pca9552.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c index d2b99fc706..e4ccdeaf78 100644 --- a/hw/misc/pca9552.c +++ b/hw/misc/pca9552.c @@ -291,13 +291,11 @@ static void pca955x_set_led(Object *obj, Visitor *v, const char *name, { PCA955xClass *k = PCA955X_GET_CLASS(obj); PCA955xState *s = PCA955X(obj); - Error *local_err = NULL; int led, rc, reg, val; uint8_t state; char *state_str; - if (!visit_type_str(v, name, &state_str, &local_err)) { - error_propagate(errp, local_err); + if (!visit_type_str(v, name, &state_str, errp)) { return; } rc = sscanf(name, "led%2d", &led); |