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https://github.com/qemu/qemu.git
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3d508e096b
Implement DTrace/SystemTap SDT by emitting the following: - The probe crate's probe!() macro is used to emit a DTrace/SystemTap SDT probe. - Every trace event gets a corresponding trace_<name>_enabled() -> bool generated function that Rust code can use to avoid expensive computation when a trace event is disabled. This API works for other trace backends too. `#[allow(dead_code)]` additions are necessary for QEMU's dstate in generated trace-<dir>.rs files since they are unused by the dtrace backend. `./configure --enable-trace-backends=` can enable multiple backends, so keep it simple and just silence the warning instead of trying to detect the condition when generating the dstate code can be skipped. The tracetool tests are updated. Take a look at tests/tracetool/dtrace.rs to see what the new generated code looks like. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Link: https://lore.kernel.org/r/20251119205200.173170-5-stefanha@redhat.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
84 lines
2.5 KiB
Python
84 lines
2.5 KiB
Python
# SPDX-License-Identifier: GPL-2.0-or-later
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"""
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trace-DIR.rs
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"""
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__author__ = "Tanish Desai <tanishdesai37@gmail.com>"
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__copyright__ = "Copyright 2025, Tanish Desai <tanishdesai37@gmail.com>"
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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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def generate(events, backend, group):
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out('// SPDX-License-Identifier: GPL-2.0-or-later',
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'// This file is @generated by tracetool, do not edit.',
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'',
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'#[allow(unused_imports)]',
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'use std::ffi::c_char;',
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'#[allow(unused_imports)]',
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'use util::bindings;',
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'',
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'#[allow(dead_code)]',
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'#[inline(always)]',
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'fn trace_event_state_is_enabled(dstate: u16) -> bool {',
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' (unsafe { trace_events_enabled_count }) != 0 && dstate != 0',
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'}',
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'',
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'extern "C" {',
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' #[allow(dead_code)]',
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' static mut trace_events_enabled_count: u32;',
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'}',)
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out('extern "C" {')
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for e in events:
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out(' #[allow(dead_code)]',
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' static mut %s: u16;' % e.api(e.QEMU_DSTATE))
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out('}',
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'')
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backend.generate_begin(events, group)
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for e in events:
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out('#[inline(always)]',
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'#[allow(dead_code)]',
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'pub fn %(api)s() -> bool',
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'{',
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api=e.api(e.QEMU_RUST_DSTATE))
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if "disable" not in e.properties:
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backend.generate_backend_dstate(e, group)
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if backend.check_trace_event_get_state:
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out(' trace_event_state_is_enabled(unsafe { _%(event_id)s_DSTATE}) ||',
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event_id = 'TRACE_' + e.name.upper())
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out(' false',
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'}',
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'',
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'#[inline(always)]',
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'#[allow(dead_code)]',
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'pub fn %(api)s(%(args)s)',
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'{',
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api=e.api(e.QEMU_TRACE),
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args=e.args.rust_decl())
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if "disable" not in e.properties:
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backend.generate(e, group, check_trace_event_get_state=False)
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if backend.check_trace_event_get_state:
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event_id = 'TRACE_' + e.name.upper()
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out(' if trace_event_state_is_enabled(unsafe { _%(event_id)s_DSTATE}) {',
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event_id = event_id,
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api=e.api())
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backend.generate(e, group, check_trace_event_get_state=True)
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out(' }')
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out('}',
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'')
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backend.generate_end(events, group)
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