Re: [PATCH v3 3/3] meson: generate trace events for qmp commands

[Markus Armbruster <armbru@redhat.com>]

Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> writes:

> 1. Use --add-trace-events when generate qmp commands
> 2. Add corresponding .trace-events files as outputs in qapi_files
>    custom target
> 3. Define global qapi_trace_events list of .trace-events file targets,
>    to fill in trace/qapi.build and to use in trace/meson.build
> 4. In trace/meson.build use the new array as an additional source of
>    .trace_events files to be processed
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
>  meson.build       |  5 +++++
>  qapi/meson.build  |  9 ++++++++-
>  trace/meson.build | 11 ++++++++---
>  3 files changed, 21 insertions(+), 4 deletions(-)
>
> diff --git a/meson.build b/meson.build
> index 762d7cee85..effd66e4c2 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -41,6 +41,7 @@ qemu_icondir = get_option('datadir') / 'icons'
>  
>  config_host_data = configuration_data()
>  genh = []
> +qapi_trace_events = []
>  
>  target_dirs = config_host['TARGET_DIRS'].split()
>  have_linux_user = false
> @@ -2554,6 +2555,10 @@ if 'CONFIG_VHOST_USER' in config_host
>    vhost_user = libvhost_user.get_variable('vhost_user_dep')
>  endif
>  
> +# Please keep ordering between 'qapi' and 'trace' subdirs:
> +# We should first handle 'qapi' subdir, so that all
> +# generated trace events be generated prior handling 'trace'
> +# subdir.

I naively expect explicit dependencies to be used for ordering, but I'm
a Meson noob.  I'd like an ACK from a non-noob on this one.

>  subdir('qapi')
>  subdir('qobject')
>  subdir('stubs')
> diff --git a/qapi/meson.build b/qapi/meson.build
> index c0c49c15e4..b48125f8da 100644
> --- a/qapi/meson.build
> +++ b/qapi/meson.build
> @@ -114,6 +114,7 @@ foreach module : qapi_all_modules
>        'qapi-events-@0@.h'.format(module),
>        'qapi-commands-@0@.c'.format(module),
>        'qapi-commands-@0@.h'.format(module),
> +      'qapi-commands-@0@.trace-events'.format(module),
>      ]
>    endif
>    if module.endswith('-target')
> @@ -126,7 +127,7 @@ endforeach
>  qapi_files = custom_target('shared QAPI source files',
>    output: qapi_util_outputs + qapi_specific_outputs + qapi_nonmodule_outputs,
>    input: [ files('qapi-schema.json') ],
> -  command: [ qapi_gen, '-o', 'qapi', '-b', '@INPUT0@' ],
> +  command: [ qapi_gen, '-o', 'qapi', '-b', '@INPUT0@', '--add-trace-events' ],
>    depend_files: [ qapi_inputs, qapi_gen_depends ])
>  
>  # Now go through all the outputs and add them to the right sourceset.
> @@ -137,6 +138,9 @@ foreach output : qapi_util_outputs
>    if output.endswith('.h')
>      genh += qapi_files[i]
>    endif
> +  if output.endswith('.trace-events')
> +    qapi_trace_events += qapi_files[i]
> +  endif
>    util_ss.add(qapi_files[i])
>    i = i + 1
>  endforeach
> @@ -145,6 +149,9 @@ foreach output : qapi_specific_outputs + qapi_nonmodule_outputs
>    if output.endswith('.h')
>      genh += qapi_files[i]
>    endif
> +  if output.endswith('.trace-events')
> +    qapi_trace_events += qapi_files[i]
> +  endif
>    specific_ss.add(when: 'CONFIG_SOFTMMU', if_true: qapi_files[i])
>    i = i + 1
>  endforeach
> diff --git a/trace/meson.build b/trace/meson.build
> index 573dd699c6..c4794a1f2a 100644
> --- a/trace/meson.build
> +++ b/trace/meson.build
> @@ -2,10 +2,15 @@
>  specific_ss.add(files('control-target.c'))
>  
>  trace_events_files = []
> -foreach dir : [ '.' ] + trace_events_subdirs
> -  trace_events_file = meson.project_source_root() / dir / 'trace-events'
> +foreach item : [ '.' ] + trace_events_subdirs + qapi_trace_events
> +  if item in qapi_trace_events
> +    trace_events_file = item
> +    group_name = item.full_path().split('/')[-1].underscorify()
> +  else
> +    trace_events_file = meson.project_source_root() / item / 'trace-events'
> +    group_name = item == '.' ? 'root' : item.underscorify()
> +  endif
>    trace_events_files += [ trace_events_file ]
> -  group_name = dir == '.' ? 'root' : dir.underscorify()
>    group = '--group=' + group_name
>    fmt = '@0@-' + group_name + '.@1@'