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)
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- !fun(args, &err, args2)
+ !fun(args, errp, args2)
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- 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;
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return c2;
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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
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!var
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var op c1
)
)
{
... when != err
when != lbl:
when strict
- error_propagate(errp, err);
... when != err
(
return;
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return c2;
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return false;
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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>
129 lines
4 KiB
C
129 lines
4 KiB
C
/*
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* QEMU 16550A UART emulation
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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* Copyright (c) 2008 Citrix Systems, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* see docs/specs/pci-serial.txt */
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "hw/char/serial.h"
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#include "hw/irq.h"
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#include "hw/pci/pci.h"
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#include "hw/qdev-properties.h"
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#include "migration/vmstate.h"
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typedef struct PCISerialState {
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PCIDevice dev;
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SerialState state;
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uint8_t prog_if;
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} PCISerialState;
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#define TYPE_PCI_SERIAL "pci-serial"
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#define PCI_SERIAL(s) OBJECT_CHECK(PCISerialState, (s), TYPE_PCI_SERIAL)
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static void serial_pci_realize(PCIDevice *dev, Error **errp)
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{
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PCISerialState *pci = DO_UPCAST(PCISerialState, dev, dev);
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SerialState *s = &pci->state;
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if (!qdev_realize(DEVICE(s), NULL, errp)) {
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return;
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}
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pci->dev.config[PCI_CLASS_PROG] = pci->prog_if;
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pci->dev.config[PCI_INTERRUPT_PIN] = 0x01;
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s->irq = pci_allocate_irq(&pci->dev);
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memory_region_init_io(&s->io, OBJECT(pci), &serial_io_ops, s, "serial", 8);
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pci_register_bar(&pci->dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &s->io);
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}
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static void serial_pci_exit(PCIDevice *dev)
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{
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PCISerialState *pci = DO_UPCAST(PCISerialState, dev, dev);
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SerialState *s = &pci->state;
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qdev_unrealize(DEVICE(s));
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qemu_free_irq(s->irq);
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}
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static const VMStateDescription vmstate_pci_serial = {
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.name = "pci-serial",
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.version_id = 1,
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.minimum_version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_PCI_DEVICE(dev, PCISerialState),
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VMSTATE_STRUCT(state, PCISerialState, 0, vmstate_serial, SerialState),
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VMSTATE_END_OF_LIST()
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}
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};
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static Property serial_pci_properties[] = {
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DEFINE_PROP_CHR("chardev", PCISerialState, state.chr),
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DEFINE_PROP_UINT8("prog_if", PCISerialState, prog_if, 0x02),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void serial_pci_class_initfn(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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PCIDeviceClass *pc = PCI_DEVICE_CLASS(klass);
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pc->realize = serial_pci_realize;
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pc->exit = serial_pci_exit;
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pc->vendor_id = PCI_VENDOR_ID_REDHAT;
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pc->device_id = PCI_DEVICE_ID_REDHAT_SERIAL;
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pc->revision = 1;
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pc->class_id = PCI_CLASS_COMMUNICATION_SERIAL;
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dc->vmsd = &vmstate_pci_serial;
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device_class_set_props(dc, serial_pci_properties);
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set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
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}
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static void serial_pci_init(Object *o)
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{
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PCISerialState *ps = PCI_SERIAL(o);
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object_initialize_child(o, "serial", &ps->state, TYPE_SERIAL);
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}
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static const TypeInfo serial_pci_info = {
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.name = TYPE_PCI_SERIAL,
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.parent = TYPE_PCI_DEVICE,
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.instance_size = sizeof(PCISerialState),
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.instance_init = serial_pci_init,
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.class_init = serial_pci_class_initfn,
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.interfaces = (InterfaceInfo[]) {
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{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
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{ },
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},
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};
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static void serial_pci_register_types(void)
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{
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type_register_static(&serial_pci_info);
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}
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type_init(serial_pci_register_types)
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