From 668f62ec621e4e2919fb7d4caa5d805764c5852d Mon Sep 17 00:00:00 2001
From: Markus Armbruster <armbru@redhat.com>
Date: Tue, 7 Jul 2020 18:06:02 +0200
Subject: 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>
---
hw/misc/macio/macio.c | 19 ++++++-------------
1 file changed, 6 insertions(+), 13 deletions(-)
(limited to 'hw/misc/macio/macio.c')
diff --git a/hw/misc/macio/macio.c b/hw/misc/macio/macio.c
index 9b6e3f120e..679722628e 100644
--- a/hw/misc/macio/macio.c
+++ b/hw/misc/macio/macio.c
@@ -98,10 +98,8 @@ static void macio_common_realize(PCIDevice *d, Error **errp)
{
MacIOState *s = MACIO(d);
SysBusDevice *sysbus_dev;
- Error *err = NULL;
- if (!qdev_realize(DEVICE(&s->dbdma), BUS(&s->macio_bus), &err)) {
- error_propagate(errp, err);
+ if (!qdev_realize(DEVICE(&s->dbdma), BUS(&s->macio_bus), errp)) {
return;
}
sysbus_dev = SYS_BUS_DEVICE(&s->dbdma);
@@ -115,8 +113,7 @@ static void macio_common_realize(PCIDevice *d, Error **errp)
qdev_prop_set_chr(DEVICE(&s->escc), "chrB", serial_hd(1));
qdev_prop_set_uint32(DEVICE(&s->escc), "chnBtype", escc_serial);
qdev_prop_set_uint32(DEVICE(&s->escc), "chnAtype", escc_serial);
- if (!qdev_realize(DEVICE(&s->escc), BUS(&s->macio_bus), &err)) {
- error_propagate(errp, err);
+ if (!qdev_realize(DEVICE(&s->escc), BUS(&s->macio_bus), errp)) {
return;
}
@@ -157,8 +154,7 @@ static void macio_oldworld_realize(PCIDevice *d, Error **errp)
qdev_prop_set_uint64(DEVICE(&s->cuda), "timebase-frequency",
s->frequency);
- if (!qdev_realize(DEVICE(&s->cuda), BUS(&s->macio_bus), &err)) {
- error_propagate(errp, err);
+ if (!qdev_realize(DEVICE(&s->cuda), BUS(&s->macio_bus), errp)) {
return;
}
sysbus_dev = SYS_BUS_DEVICE(&s->cuda);
@@ -173,8 +169,7 @@ static void macio_oldworld_realize(PCIDevice *d, Error **errp)
sysbus_connect_irq(sysbus_dev, 1, qdev_get_gpio_in(pic_dev,
OLDWORLD_ESCCA_IRQ));
- if (!qdev_realize(DEVICE(&os->nvram), BUS(&s->macio_bus), &err)) {
- error_propagate(errp, err);
+ if (!qdev_realize(DEVICE(&os->nvram), BUS(&s->macio_bus), errp)) {
return;
}
sysbus_dev = SYS_BUS_DEVICE(&os->nvram);
@@ -343,8 +338,7 @@ static void macio_newworld_realize(PCIDevice *d, Error **errp)
object_property_set_link(OBJECT(&s->pmu), "gpio", OBJECT(sysbus_dev),
&error_abort);
qdev_prop_set_bit(DEVICE(&s->pmu), "has-adb", ns->has_adb);
- if (!qdev_realize(DEVICE(&s->pmu), BUS(&s->macio_bus), &err)) {
- error_propagate(errp, err);
+ if (!qdev_realize(DEVICE(&s->pmu), BUS(&s->macio_bus), errp)) {
return;
}
sysbus_dev = SYS_BUS_DEVICE(&s->pmu);
@@ -360,8 +354,7 @@ static void macio_newworld_realize(PCIDevice *d, Error **errp)
qdev_prop_set_uint64(DEVICE(&s->cuda), "timebase-frequency",
s->frequency);
- if (!qdev_realize(DEVICE(&s->cuda), BUS(&s->macio_bus), &err)) {
- error_propagate(errp, err);
+ if (!qdev_realize(DEVICE(&s->cuda), BUS(&s->macio_bus), errp)) {
return;
}
sysbus_dev = SYS_BUS_DEVICE(&s->cuda);
--
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