mirror of https://gitee.com/openkylin/qemu.git
668f62ec62
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>
|
||
|---|---|---|
| .. | ||
| Makefile.objs | ||
| arch_dump.c | ||
| cc_helper.c | ||
| cpu-param.h | ||
| cpu-qom.h | ||
| cpu.c | ||
| cpu.h | ||
| cpu_features.c | ||
| cpu_features.h | ||
| cpu_features_def.h | ||
| cpu_features_def.inc.h | ||
| cpu_models.c | ||
| cpu_models.h | ||
| crypto_helper.c | ||
| diag.c | ||
| excp_helper.c | ||
| fpu_helper.c | ||
| gdbstub.c | ||
| gen-features.c | ||
| helper.c | ||
| helper.h | ||
| insn-data.def | ||
| insn-format.def | ||
| int_helper.c | ||
| internal.h | ||
| interrupt.c | ||
| ioinst.c | ||
| kvm-stub.c | ||
| kvm.c | ||
| kvm_s390x.h | ||
| machine.c | ||
| mem_helper.c | ||
| misc_helper.c | ||
| mmu_helper.c | ||
| s390-tod.h | ||
| sigp.c | ||
| tcg-stub.c | ||
| tcg_s390x.h | ||
| trace-events | ||
| translate.c | ||
| translate_vx.inc.c | ||
| vec.h | ||
| vec_fpu_helper.c | ||
| vec_helper.c | ||
| vec_int_helper.c | ||
| vec_string_helper.c | ||