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tracetool: add output filename command-line argument 

The tracetool.py script writes to stdout. This means the output filename
is not available to the script. Add the output filename to the
command-line so that the script has access to the filename.

This also simplifies the tracetool.py invocation. It's no longer
necessary to use meson's custom_build(capture : true) to save output.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20200827142915.108730-2-stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2020-08-27 15:29:12 +01:00
parent 6745c8a01f
commit c05012a365
5 changed files with 33 additions and 24 deletions
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3
docs/devel/tracing.txt
View File

@ -318,7 +318,8 @@ probes:
--target-type system \
--target-name x86_64 \
--group=all \
trace-events-all >qemu.stp
trace-events-all \
qemu.stp
To facilitate simple usage of systemtap where there merely needs to be printf
logging of certain probes, a helper script "qemu-trace-stap" is provided.

3
meson.build
View File

@ -1901,7 +1901,6 @@ foreach target : target_dirs
custom_target(exe['name'] + stp['ext'],
input: trace_events_all,
output: exe['name'] + stp['ext'],
capture: true,
install: stp['install'],
install_dir: get_option('datadir') / 'systemtap/tapset',
command: [
@ -1910,7 +1909,7 @@ foreach target : target_dirs
'--target-name=' + target_name,
'--target-type=' + target_type,
'--probe-prefix=qemu.' + target_type + '.' + target_name,
'@INPUT@',
'@INPUT@', '@OUTPUT@'
])
endforeach
endif

12
scripts/tracetool.py
View File

@ -16,7 +16,7 @@ __email__ = "stefanha@redhat.com"
import sys
import getopt
from tracetool import error_write, out
from tracetool import error_write, out, out_open
import tracetool.backend
import tracetool.format
@ -32,7 +32,7 @@ def error_opt(msg = None):
format_descr = "\n".join([ " %-15s %s" % (n, d)
for n,d in tracetool.format.get_list() ])
error_write("""\
Usage: %(script)s --format=<format> --backends=<backends> [<options>]
Usage: %(script)s --format=<format> --backends=<backends> [<options>] <trace-events> ... <output>
Backends:
%(backends)s
@ -135,13 +135,15 @@ def main(args):
if probe_prefix is None:
probe_prefix = ".".join(["qemu", target_type, target_name])
if len(args) < 1:
error_opt("missing trace-events filepath")
if len(args) < 2:
error_opt("missing trace-events and output filepaths")
events = []
for arg in args:
for arg in args[:-1]:
with open(arg, "r") as fh:
events.extend(tracetool.read_events(fh, arg))
out_open(args[-1])
try:
tracetool.generate(events, arg_group, arg_format, arg_backends,
binary=binary, probe_prefix=probe_prefix)

18
scripts/tracetool/__init__.py
View File

@ -31,14 +31,28 @@ def error(*lines):
sys.exit(1)
out_filename = '<none>'
out_fobj = sys.stdout
def out_open(filename):
global out_filename, out_fobj
out_filename = filename
out_fobj = open(filename, 'wt')
def out(*lines, **kwargs):
"""Write a set of output lines.
You can use kwargs as a shorthand for mapping variables when formatting all
the strings in lines.
The 'out_filename' kwarg is automatically added with the output filename.
"""
lines = [ l % kwargs for l in lines ]
sys.stdout.writelines("\n".join(lines) + "\n")
output = []
for l in lines:
kwargs['out_filename'] = out_filename
output.append(l % kwargs)
out_fobj.writelines("\n".join(output) + "\n")
# We only want to allow standard C types or fixed sized
# integer types. We don't want QEMU specific types

21
trace/meson.build
View File

@ -11,20 +11,17 @@ foreach dir : [ '.' ] + trace_events_subdirs
trace_h = custom_target(fmt.format('trace', 'h'),
output: fmt.format('trace', 'h'),
input: trace_events_file,
command: [ tracetool, group, '--format=h', '@INPUT@' ],
capture: true)
command: [ tracetool, group, '--format=h', '@INPUT@', '@OUTPUT@' ])
genh += trace_h
trace_c = custom_target(fmt.format('trace', 'c'),
output: fmt.format('trace', 'c'),
input: trace_events_file,
command: [ tracetool, group, '--format=c', '@INPUT@' ],
capture: true)
command: [ tracetool, group, '--format=c', '@INPUT@', '@OUTPUT@' ])
if 'CONFIG_TRACE_UST' in config_host
trace_ust_h = custom_target(fmt.format('trace-ust', 'h'),
output: fmt.format('trace-ust', 'h'),
input: trace_events_file,
command: [ tracetool, group, '--format=ust-events-h', '@INPUT@' ],
capture: true)
command: [ tracetool, group, '--format=ust-events-h', '@INPUT@', '@OUTPUT@' ])
trace_ss.add(trace_ust_h, lttng, urcubp)
genh += trace_ust_h
endif
@ -33,8 +30,7 @@ foreach dir : [ '.' ] + trace_events_subdirs
trace_dtrace = custom_target(fmt.format('trace-dtrace', 'dtrace'),
output: fmt.format('trace-dtrace', 'dtrace'),
input: trace_events_file,
command: [ tracetool, group, '--format=d', '@INPUT@' ],
capture: true)
command: [ tracetool, group, '--format=d', '@INPUT@', '@OUTPUT@' ])
trace_dtrace_h = custom_target(fmt.format('trace-dtrace', 'h'),
output: fmt.format('trace-dtrace', 'h'),
input: trace_dtrace,
@ -69,8 +65,7 @@ foreach d : [
gen = custom_target(d[0],
output: d[0],
input: meson.source_root() / 'trace-events',
command: [ tracetool, '--group=root', '--format=@0@'.format(d[1]), '@INPUT@' ],
capture: true)
command: [ tracetool, '--group=root', '--format=@0@'.format(d[1]), '@INPUT@', '@OUTPUT@' ])
specific_ss.add(gen)
endforeach
@ -78,13 +73,11 @@ if 'CONFIG_TRACE_UST' in config_host
trace_ust_all_h = custom_target('trace-ust-all.h',
output: 'trace-ust-all.h',
input: trace_events_files,
command: [ tracetool, '--group=all', '--format=ust-events-h', '@INPUT@' ],
capture: true)
command: [ tracetool, '--group=all', '--format=ust-events-h', '@INPUT@', '@OUTPUT@' ])
trace_ust_all_c = custom_target('trace-ust-all.c',
output: 'trace-ust-all.c',
input: trace_events_files,
command: [ tracetool, '--group=all', '--format=ust-events-c', '@INPUT@' ],
capture: true)
command: [ tracetool, '--group=all', '--format=ust-events-c', '@INPUT@', '@OUTPUT@' ])
trace_ss.add(trace_ust_all_h, trace_ust_all_c)
genh += trace_ust_all_h
endif