b33b890cd0
target/hppa/trace-events only contains disabled events, resulting in a
trace-dtrace.dtrace file that says "provider qemu {}". SystemTap's
dtrace(1) tool prints a warning when processing this input file.
This patch avoids the error by emitting an empty file instead of
"provider qemu {}" when there are no enabled trace events.
Fixes: 23c3d569f44284066714ff7c46bc4f19e630583f ("target/hppa: add TLB trace events")
Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Message-id: 20190321170831.6539-3-stefanha@redhat.com
Message-Id: <20190321170831.6539-3-stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
60 lines
1.7 KiB
Python
60 lines
1.7 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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trace/generated-tracers.dtrace (DTrace only).
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"""
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__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
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__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
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__license__ = "GPL version 2 or (at your option) any later version"
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__maintainer__ = "Stefan Hajnoczi"
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__email__ = "stefanha@linux.vnet.ibm.com"
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from tracetool import out
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# Reserved keywords from
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# https://wikis.oracle.com/display/DTrace/Types,+Operators+and+Expressions
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RESERVED_WORDS = (
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'auto', 'goto', 'sizeof', 'break', 'if', 'static', 'case', 'import',
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'string', 'char', 'inline', 'stringof', 'const', 'int', 'struct',
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'continue', 'long', 'switch', 'counter', 'offsetof', 'this',
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'default', 'probe', 'translator', 'do', 'provider', 'typedef',
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'double', 'register', 'union', 'else', 'restrict', 'unsigned',
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'enum', 'return', 'void', 'extern', 'self', 'volatile', 'float',
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'short', 'while', 'for', 'signed', 'xlate',
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)
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def generate(events, backend, group):
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events = [e for e in events
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if "disable" not in e.properties]
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# SystemTap's dtrace(1) warns about empty "provider qemu {}" but is happy
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# with an empty file. Avoid the warning.
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if not events:
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return
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out('/* This file is autogenerated by tracetool, do not edit. */'
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'',
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'provider qemu {')
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for e in events:
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args = []
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for type_, name in e.args:
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if name in RESERVED_WORDS:
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name += '_'
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args.append(type_ + ' ' + name)
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# Define prototype for probe arguments
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out('',
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'probe %(name)s(%(args)s);',
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name=e.name,
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args=','.join(args))
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out('',
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'};')
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