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/stm32f405_soc.c | 27 +++++++++------------------ 1 file changed, 9 insertions(+), 18 deletions(-) (limited to 'hw/arm/stm32f405_soc.c') diff --git a/hw/arm/stm32f405_soc.c b/hw/arm/stm32f405_soc.c index ddc680bfe0..cb04c11198 100644 --- a/hw/arm/stm32f405_soc.c +++ b/hw/arm/stm32f405_soc.c @@ -118,15 +118,13 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp) qdev_prop_set_bit(armv7m, "enable-bitband", true); object_property_set_link(OBJECT(&s->armv7m), "memory", OBJECT(system_memory), &error_abort); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->armv7m), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->armv7m), errp)) { return; } /* System configuration controller */ dev = DEVICE(&s->syscfg); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->syscfg), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->syscfg), errp)) { return; } busdev = SYS_BUS_DEVICE(dev); @@ -137,8 +135,7 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp) for (i = 0; i < STM_NUM_USARTS; i++) { dev = DEVICE(&(s->usart[i])); qdev_prop_set_chr(dev, "chardev", serial_hd(i)); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->usart[i]), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->usart[i]), errp)) { return; } busdev = SYS_BUS_DEVICE(dev); @@ -150,8 +147,7 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp) for (i = 0; i < STM_NUM_TIMERS; i++) { dev = DEVICE(&(s->timer[i])); qdev_prop_set_uint64(dev, "clock-frequency", 1000000000); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->timer[i]), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->timer[i]), errp)) { return; } busdev = SYS_BUS_DEVICE(dev); @@ -162,14 +158,12 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp) /* ADC device, the IRQs are ORed together */ if (!object_initialize_child_with_props(OBJECT(s), "adc-orirq", &s->adc_irqs, sizeof(s->adc_irqs), - TYPE_OR_IRQ, &err, NULL)) { - error_propagate(errp, err); + TYPE_OR_IRQ, errp, NULL)) { return; } object_property_set_int(OBJECT(&s->adc_irqs), "num-lines", STM_NUM_ADCS, &error_abort); - if (!qdev_realize(DEVICE(&s->adc_irqs), NULL, &err)) { - error_propagate(errp, err); + if (!qdev_realize(DEVICE(&s->adc_irqs), NULL, errp)) { return; } qdev_connect_gpio_out(DEVICE(&s->adc_irqs), 0, @@ -177,8 +171,7 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp) for (i = 0; i < STM_NUM_ADCS; i++) { dev = DEVICE(&(s->adc[i])); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->adc[i]), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->adc[i]), errp)) { return; } busdev = SYS_BUS_DEVICE(dev); @@ -190,8 +183,7 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp) /* SPI devices */ for (i = 0; i < STM_NUM_SPIS; i++) { dev = DEVICE(&(s->spi[i])); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->spi[i]), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->spi[i]), errp)) { return; } busdev = SYS_BUS_DEVICE(dev); @@ -201,8 +193,7 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp) /* EXTI device */ dev = DEVICE(&s->exti); - if (!sysbus_realize(SYS_BUS_DEVICE(&s->exti), &err)) { - error_propagate(errp, err); + if (!sysbus_realize(SYS_BUS_DEVICE(&s->exti), errp)) { return; } busdev = SYS_BUS_DEVICE(dev); -- cgit 1.4.1