On 8/6/19 5:14 PM, Markus Armbruster wrote:
> In my "build everything" tree, changing a type in qapi/common.json
> triggers a recompile of some 3600 out of 6600 objects (not counting
> tests and objects that don't depend on qemu/osdep.h).
>
> One common dependency is QapiErrorClass: it's used only in in
> qapi/error.h, which uses nothing else, and is widely included.
>
> Move QapiErrorClass from common.json to new error.json. Touching
> common.json now recompiles only some 2900 objects.
Nice.
>
> Cc: Eric Blake <ebl...@redhat.com>
> Signed-off-by: Markus Armbruster <arm...@redhat.com>
> Reviewed-by: Eric Blake <ebl...@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com>
Tested-by: Philippe Mathieu-Daudé <phi...@redhat.com>
> ---
> MAINTAINERS | 2 ++
> include/qapi/error.h | 2 +-
> qapi/Makefile.objs | 2 +-
> qapi/common.json | 24 ------------------------
> qapi/error.json | 29 +++++++++++++++++++++++++++++
> qapi/qapi-schema.json | 1 +
> 6 files changed, 34 insertions(+), 26 deletions(-)
> create mode 100644 qapi/error.json
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index d6de200453..adc64cfe33 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1874,6 +1874,7 @@ M: Markus Armbruster <arm...@redhat.com>
> S: Supported
> F: include/qapi/error.h
> F: include/qemu/error-report.h
> +F: qapi/error.json
> F: util/error.c
> F: util/qemu-error.c
>
> @@ -2062,6 +2063,7 @@ F: monitor/monitor-internal.h
> F: monitor/qmp*
> F: monitor/misc.c
> F: monitor/monitor.c
> +F: qapi/error.json
> F: docs/devel/*qmp-*
> F: docs/interop/*qmp-*
> F: scripts/qmp/
> diff --git a/include/qapi/error.h b/include/qapi/error.h
> index 51b63dd4b5..3f95141a01 100644
> --- a/include/qapi/error.h
> +++ b/include/qapi/error.h
> @@ -119,7 +119,7 @@
> #ifndef ERROR_H
> #define ERROR_H
>
> -#include "qapi/qapi-types-common.h"
> +#include "qapi/qapi-types-error.h"
>
> /*
> * Overall category of an error.
> diff --git a/qapi/Makefile.objs b/qapi/Makefile.objs
> index c5a29e86e2..dd3f5e6f94 100644
> --- a/qapi/Makefile.objs
> +++ b/qapi/Makefile.objs
> @@ -6,7 +6,7 @@ util-obj-y += qmp-event.o
> util-obj-y += qapi-util.o
>
> QAPI_COMMON_MODULES = audio authz block-core block char common crypto
> -QAPI_COMMON_MODULES += dump introspect job machine migration misc net
> +QAPI_COMMON_MODULES += dump error introspect job machine migration misc net
> QAPI_COMMON_MODULES += qdev qom rdma rocker run-state sockets tpm
> QAPI_COMMON_MODULES += trace transaction ui
> QAPI_TARGET_MODULES = machine-target misc-target
> diff --git a/qapi/common.json b/qapi/common.json
> index 99d313ef3b..3d4e8de1e0 100644
> --- a/qapi/common.json
> +++ b/qapi/common.json
> @@ -4,30 +4,6 @@
> # = Common data types
> ##
>
> -##
> -# @QapiErrorClass:
> -#
> -# QEMU error classes
> -#
> -# @GenericError: this is used for errors that don't require a specific error
> -# class. This should be the default case for most errors
> -#
> -# @CommandNotFound: the requested command has not been found
> -#
> -# @DeviceNotActive: a device has failed to be become active
> -#
> -# @DeviceNotFound: the requested device has not been found
> -#
> -# @KVMMissingCap: the requested operation can't be fulfilled because a
> -# required KVM capability is missing
> -#
> -# Since: 1.2
> -##
> -{ 'enum': 'QapiErrorClass',
> - # Keep this in sync with ErrorClass in error.h
> - 'data': [ 'GenericError', 'CommandNotFound',
> - 'DeviceNotActive', 'DeviceNotFound', 'KVMMissingCap' ] }
> -
> ##
> # @IoOperationType:
> #
> diff --git a/qapi/error.json b/qapi/error.json
> new file mode 100644
> index 0000000000..3fad08f506
> --- /dev/null
> +++ b/qapi/error.json
> @@ -0,0 +1,29 @@
> +# -*- Mode: Python -*-
> +
> +##
> +# = QMP errors
> +##
> +
> +##
> +# @QapiErrorClass:
> +#
> +# QEMU error classes
> +#
> +# @GenericError: this is used for errors that don't require a specific error
> +# class. This should be the default case for most errors
> +#
> +# @CommandNotFound: the requested command has not been found
> +#
> +# @DeviceNotActive: a device has failed to be become active
> +#
> +# @DeviceNotFound: the requested device has not been found
> +#
> +# @KVMMissingCap: the requested operation can't be fulfilled because a
> +# required KVM capability is missing
> +#
> +# Since: 1.2
> +##
> +{ 'enum': 'QapiErrorClass',
> + # Keep this in sync with ErrorClass in error.h
> + 'data': [ 'GenericError', 'CommandNotFound',
> + 'DeviceNotActive', 'DeviceNotFound', 'KVMMissingCap' ] }
> diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json
> index 38af54d6b3..920b03b0aa 100644
> --- a/qapi/qapi-schema.json
> +++ b/qapi/qapi-schema.json
> @@ -80,6 +80,7 @@
> # stable order, it's best to include each sub-schema just once, or
> # include it first right here.
>
> +{ 'include': 'error.json' }
> { 'include': 'common.json' }
> { 'include': 'sockets.json' }
> { 'include': 'run-state.json' }
>
