27e08bab94
Both the dtrace and ust backends may include <sys/sdt.h> but LTTng Userspace Tracer 2.11 and later requires SDT_USE_VARIADIC to be defined before including the header file. This is a classic problem with C header files included from different parts of a program. If the same header is included twice within the same compilation unit then the first inclusion determines the macro environment. Work around this by defining SDT_USE_VARIADIC in the dtrace backend too. It doesn't hurt and fixes a missing STAP_PROBEV() compiler error when the ust backend is enabled together with the dtrace backend. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20200625140757.237012-1-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
69 lines
1.7 KiB
Python
69 lines
1.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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DTrace/SystemTAP backend.
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"""
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__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
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__copyright__ = "Copyright 2012-2017, 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@redhat.com"
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from tracetool import out
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PUBLIC = True
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PROBEPREFIX = None
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def probeprefix():
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if PROBEPREFIX is None:
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raise ValueError("you must set PROBEPREFIX")
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return PROBEPREFIX
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BINARY = None
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def binary():
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if BINARY is None:
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raise ValueError("you must set BINARY")
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return BINARY
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def generate_h_begin(events, group):
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if group == "root":
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header = "trace-dtrace-root.h"
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else:
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header = "trace-dtrace.h"
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# Workaround for ust backend, which also includes <sys/sdt.h> and may
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# require SDT_USE_VARIADIC to be defined. If dtrace includes <sys/sdt.h>
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# first without defining SDT_USE_VARIADIC then ust breaks because the
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# STAP_PROBEV() macro is not defined.
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out('#define SDT_USE_VARIADIC 1')
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out('#include "%s"' % header,
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'')
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# SystemTap defines <provider>_<name>_ENABLED() but other DTrace
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# implementations might not.
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for e in events:
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out('#ifndef QEMU_%(uppername)s_ENABLED',
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'#define QEMU_%(uppername)s_ENABLED() true',
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'#endif',
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uppername=e.name.upper())
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def generate_h(event, group):
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out(' QEMU_%(uppername)s(%(argnames)s);',
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uppername=event.name.upper(),
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argnames=", ".join(event.args.names()))
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def generate_h_backend_dstate(event, group):
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out(' QEMU_%(uppername)s_ENABLED() || \\',
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uppername=event.name.upper())
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