From e2e182bef73f24d885f7f2ca589d8ec004c24877 Mon Sep 17 00:00:00 2001 From: Tanish Desai Date: Mon, 29 Sep 2025 17:49:30 +0200 Subject: tracetool: Add Rust format support Generating .rs files makes it possible to support tracing in rust. This support comprises a new format, and common code that converts the C expressions in trace-events to Rust. In particular, types need to be converted, and PRI macros expanded. As of this commit no backend generates Rust code, but it is already possible to use tracetool to generate Rust sources; they are not functional but they compile and contain tracepoint functions. [Move Rust argument conversion from Event to Arguments; string support. - Paolo] Signed-off-by: Tanish Desai Signed-off-by: Paolo Bonzini Message-ID: <20250929154938.594389-9-pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi --- scripts/tracetool/format/rs.py | 64 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 scripts/tracetool/format/rs.py (limited to 'scripts/tracetool/format/rs.py') diff --git a/scripts/tracetool/format/rs.py b/scripts/tracetool/format/rs.py new file mode 100644 index 0000000000..32ac4e5977 --- /dev/null +++ b/scripts/tracetool/format/rs.py @@ -0,0 +1,64 @@ +# SPDX-License-Identifier: GPL-2.0-or-later + +""" +trace-DIR.rs +""" + +__author__ = "Tanish Desai " +__copyright__ = "Copyright 2025, Tanish Desai " +__license__ = "GPL version 2 or (at your option) any later version" + +__maintainer__ = "Stefan Hajnoczi" +__email__ = "stefanha@redhat.com" + + +from tracetool import out + + +def generate(events, backend, group): + out('// SPDX-License-Identifier: GPL-2.0-or-later', + '// This file is @generated by tracetool, do not edit.', + '', + '#[allow(unused_imports)]', + 'use std::ffi::c_char;', + '#[allow(unused_imports)]', + 'use util::bindings;', + '', + '#[inline(always)]', + 'fn trace_event_state_is_enabled(dstate: u16) -> bool {', + ' (unsafe { trace_events_enabled_count }) != 0 && dstate != 0', + '}', + '', + 'extern "C" {', + ' static mut trace_events_enabled_count: u32;', + '}',) + + out('extern "C" {') + + for e in events: + out(' static mut %s: u16;' % e.api(e.QEMU_DSTATE)) + out('}') + + backend.generate_begin(events, group) + + for e in events: + out('', + '#[inline(always)]', + '#[allow(dead_code)]', + 'pub fn %(api)s(%(args)s)', + '{', + api=e.api(e.QEMU_TRACE), + args=e.args.rust_decl()) + + if "disable" not in e.properties: + backend.generate(e, group, check_trace_event_get_state=False) + if backend.check_trace_event_get_state: + event_id = 'TRACE_' + e.name.upper() + out(' if trace_event_state_is_enabled(unsafe { _%(event_id)s_DSTATE}) {', + event_id = event_id, + api=e.api()) + backend.generate(e, group, check_trace_event_get_state=True) + out(' }') + out('}') + + backend.generate_end(events, group) -- cgit 1.4.1