From 668f62ec621e4e2919fb7d4caa5d805764c5852d Mon Sep 17 00:00:00 2001 From: Markus Armbruster 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 Reviewed-by: Eric Blake Message-Id: <20200707160613.848843-35-armbru@redhat.com> --- hw/arm/bcm2835_peripherals.c | 48 +++++++++++++++----------------------------- 1 file changed, 16 insertions(+), 32 deletions(-) (limited to 'hw/arm/bcm2835_peripherals.c') diff --git a/hw/arm/bcm2835_peripherals.c b/hw/arm/bcm2835_peripherals.c index cb724c18e8..a9d7f53f6e 100644 --- a/hw/arm/bcm2835_peripherals.c +++ b/hw/arm/bcm2835_peripherals.c @@ -156,8 +156,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) } /* Interrupt Controller */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->ic), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->ic), errp)) { return; } @@ -166,8 +165,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) sysbus_pass_irq(SYS_BUS_DEVICE(s), SYS_BUS_DEVICE(&s->ic)); /* Sys Timer */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->systmr), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->systmr), errp)) { return; } memory_region_add_subregion(&s->peri_mr, ST_OFFSET, @@ -178,8 +176,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) /* UART0 */ qdev_prop_set_chr(DEVICE(&s->uart0), "chardev", serial_hd(0)); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->uart0), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->uart0), errp)) { return; } @@ -192,8 +189,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) /* AUX / UART1 */ qdev_prop_set_chr(DEVICE(&s->aux), "chardev", serial_hd(1)); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->aux), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->aux), errp)) { return; } @@ -204,8 +200,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) INTERRUPT_AUX)); /* Mailboxes */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->mboxes), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->mboxes), errp)) { return; } @@ -223,13 +218,11 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) } if (!object_property_set_uint(OBJECT(&s->fb), "vcram-base", - ram_size - vcram_size, &err)) { - error_propagate(errp, err); + ram_size - vcram_size, errp)) { return; } - if (!sysbus_realize(SYS_BUS_DEVICE(&s->fb), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->fb), errp)) { return; } @@ -239,8 +232,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) qdev_get_gpio_in(DEVICE(&s->mboxes), MBOX_CHAN_FB)); /* Property channel */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->property), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->property), errp)) { return; } @@ -251,8 +243,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) qdev_get_gpio_in(DEVICE(&s->mboxes), MBOX_CHAN_PROPERTY)); /* Random Number Generator */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->rng), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->rng), errp)) { return; } @@ -275,8 +266,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) BCM2835_SDHC_CAPAREG, &error_abort); object_property_set_bool(OBJECT(&s->sdhci), "pending-insert-quirk", true, &error_abort); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->sdhci), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->sdhci), errp)) { return; } @@ -287,8 +277,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) INTERRUPT_ARASANSDIO)); /* SDHOST */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->sdhost), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->sdhost), errp)) { return; } @@ -299,8 +288,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) INTERRUPT_SDIO)); /* DMA Channels */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->dma), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->dma), errp)) { return; } @@ -317,16 +305,14 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) } /* THERMAL */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->thermal), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->thermal), errp)) { return; } memory_region_add_subregion(&s->peri_mr, THERMAL_OFFSET, sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->thermal), 0)); /* GPIO */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->gpio), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->gpio), errp)) { return; } @@ -336,8 +322,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) object_property_add_alias(OBJECT(s), "sd-bus", OBJECT(&s->gpio), "sd-bus"); /* Mphi */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->mphi), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->mphi), errp)) { return; } @@ -348,8 +333,7 @@ static void bcm2835_peripherals_realize(DeviceState *dev, Error **errp) INTERRUPT_HOSTPORT)); /* DWC2 */ - if (!sysbus_realize(SYS_BUS_DEVICE(&s->dwc2), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->dwc2), errp)) { return; } -- cgit v1.2.3-55-g7522