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error: Eliminate error_propagate() with Coccinelle, part 1

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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>
This commit is contained in:
Markus Armbruster 2020-07-07 18:06:02 +02:00
parent dcfe480544
commit 668f62ec62
114 changed files with 383 additions and 896 deletions
Download patch file Download diff file Expand all files Collapse all files

24
hw/arm/armv7m.c
View file

@ -175,27 +175,23 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
}
if (object_property_find(OBJECT(s->cpu), "init-svtor", NULL)) {
if (!object_property_set_uint(OBJECT(s->cpu), "init-svtor",
s->init_svtor, &err)) {
error_propagate(errp, err);
s->init_svtor, errp)) {
return;
}
}
if (object_property_find(OBJECT(s->cpu), "start-powered-off", NULL)) {
if (!object_property_set_bool(OBJECT(s->cpu), "start-powered-off",
s->start_powered_off, &err)) {
error_propagate(errp, err);
s->start_powered_off, errp)) {
return;
}
}
if (object_property_find(OBJECT(s->cpu), "vfp", NULL)) {
if (!object_property_set_bool(OBJECT(s->cpu), "vfp", s->vfp, &err)) {
error_propagate(errp, err);
if (!object_property_set_bool(OBJECT(s->cpu), "vfp", s->vfp, errp)) {
return;
}
}
if (object_property_find(OBJECT(s->cpu), "dsp", NULL)) {
if (!object_property_set_bool(OBJECT(s->cpu), "dsp", s->dsp, &err)) {
error_propagate(errp, err);
if (!object_property_set_bool(OBJECT(s->cpu), "dsp", s->dsp, errp)) {
return;
}
}
@ -207,14 +203,12 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
s->cpu->env.nvic = &s->nvic;
s->nvic.cpu = s->cpu;
if (!qdev_realize(DEVICE(s->cpu), NULL, &err)) {
error_propagate(errp, err);
if (!qdev_realize(DEVICE(s->cpu), NULL, errp)) {
return;
}
/* Note that we must realize the NVIC after the CPU */
if (!sysbus_realize(SYS_BUS_DEVICE(&s->nvic), &err)) {
error_propagate(errp, err);
if (!sysbus_realize(SYS_BUS_DEVICE(&s->nvic), errp)) {
return;
}
@ -240,14 +234,12 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
SysBusDevice *sbd = SYS_BUS_DEVICE(&s->bitband[i]);
if (!object_property_set_int(obj, "base",
bitband_input_addr[i], &err)) {
error_propagate(errp, err);
bitband_input_addr[i], errp)) {
return;
}
object_property_set_link(obj, "source-memory",
OBJECT(s->board_memory), &error_abort);
if (!sysbus_realize(SYS_BUS_DEVICE(obj), &err)) {
error_propagate(errp, err);
if (!sysbus_realize(SYS_BUS_DEVICE(obj), errp)) {
return;
}