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Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1755870042046124100 Content-Type: text/plain; charset="utf-8" From: Tanish Desai 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. Fortunately, all common platforms have a known mapping of 8/16/32/64-bit integers to char/short/int/"long long": even if int64_t is equal to long, it is fine to change the format string from PRIx64's expansion "%lx" to "%llx". This makes it possible to have a static mapping from PRI macros to their expansion. 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. Signed-off-by: Tanish Desai [Move Rust argument conversion from Event to Arguments; string support. - Paolo] Signed-off-by: Paolo Bonzini --- scripts/tracetool/__init__.py | 156 +++++++++++++++++++++++++++++++++ scripts/tracetool/format/rs.py | 76 ++++++++++++++++ 2 files changed, 232 insertions(+) create mode 100644 scripts/tracetool/format/rs.py diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py index 1d5238a0843..0b8ec707332 100644 --- a/scripts/tracetool/__init__.py +++ b/scripts/tracetool/__init__.py @@ -31,6 +31,49 @@ def error(*lines): error_write(*lines) sys.exit(1) =20 +FMT_TOKEN =3D re.compile(r'''(?: + " ( (?: [^"\\] | \\[\\"abfnrt] | # a str= ing literal + \\x[0-9a-fA-F][0-9a-fA-F]) *? ) " + | ( PRI [duixX] (?:8|16|32|64|PTR|MAX) ) # a PRI= xxx macro + | \s+ # space= s (ignored) + )''', re.X) + +PRI_SIZE_MAP =3D { + '8': 'hh', + '16': 'h', + '32': '', + '64': 'll', + 'PTR': 't', + 'MAX': 'j', +} + +def expand_format_string(c_fmt, prefix=3D""): + def pri_macro_to_fmt(pri_macro): + assert pri_macro.startswith("PRI") + fmt_type =3D pri_macro[3] # 'd', 'i', 'u', or 'x' + fmt_size =3D pri_macro[4:] # '8', '16', '32', '64', 'PTR', 'MAX' + + size =3D PRI_SIZE_MAP.get(fmt_size, None) + if size is None: + raise Exception(f"unknown macro {pri_macro}") + return size + fmt_type + + result =3D prefix + pos =3D 0 + while pos < len(c_fmt): + m =3D FMT_TOKEN.match(c_fmt, pos) + if not m: + print("No match at position", pos, ":", repr(c_fmt[pos:]), fil= e=3Dsys.stderr) + raise Exception("syntax error in trace file") + if m[1]: + substr =3D m[1] + elif m[2]: + substr =3D pri_macro_to_fmt(m[2]) + else: + substr =3D "" + result +=3D substr + pos =3D m.end() + return result =20 out_lineno =3D 1 out_filename =3D '' @@ -90,6 +133,48 @@ def out(*lines, **kwargs): "ptrdiff_t", ] =20 +C_TYPE_KEYWORDS =3D {"int", "short", "long", "unsigned", "char"} + +C_TO_RUST_TYPE_MAP =3D { + "int": "std::ffi::c_int", + "long": "std::ffi::c_long", + "long long": "std::ffi::c_longlong", + "short": "std::ffi::c_short", + "char": "std::ffi::c_char", + "bool": "bool", + "unsigned": "std::ffi::c_uint", + "unsigned long": "std::ffi::c_long", + "unsigned long long": "std::ffi::c_ulonglong", + "unsigned short": "std::ffi::c_ushort", + "unsigned char": "u8", + "int8_t": "i8", + "uint8_t": "u8", + "int16_t": "i16", + "uint16_t": "u16", + "int32_t": "i32", + "uint32_t": "u32", + "int64_t": "i64", + "uint64_t": "u64", + "void": "()", + "size_t": "usize", + "ssize_t": "isize", + "uintptr_t": "usize", + "ptrdiff_t": "isize", +} + +# Rust requires manual casting of <32-bit types when passing them to +# variable-argument functions. +RUST_VARARGS_SMALL_TYPES =3D { + "std::ffi::c_short", + "std::ffi::c_ushort", + "std::ffi::c_char", + "i8", + "u8", + "i16", + "u16", + "bool", +} + def validate_type(name): bits =3D name.split(" ") for bit in bits: @@ -105,6 +190,40 @@ def validate_type(name): "other complex pointer types should be " "declared as 'void *'" % name) =20 +def c_type_to_rust(name): + ptr =3D False + const =3D False + name =3D name.rstrip() + if name[-1] =3D=3D '*': + name =3D name[:-1].rstrip() + ptr =3D True + if name[-1] =3D=3D '*': + # pointers to pointers are the same as void* + name =3D "void" + + bits =3D iter(name.split()) + bit =3D next(bits) + if bit =3D=3D "const": + const =3D True + bit =3D next(bits) + + if bit in C_TYPE_KEYWORDS: + if bit =3D=3D 'signed': + bit =3D '' + rest =3D list(bits) + if rest and rest[-1] =3D=3D 'int': + rest =3D rest[:-1] + name =3D bit + ' ' + ' '.join(rest) + else: + if list(bits): + raise ValueError("Invalid type '%s'." % name) + name =3D bit + + ty =3D C_TO_RUST_TYPE_MAP[name.strip()] + if ptr: + ty =3D f'*{"const" if const else "mut"} {ty}' + return ty + class Arguments: """Event arguments description.""" =20 @@ -197,6 +316,43 @@ def casted(self): """List of argument names casted to their type.""" return ["(%s)%s" % (type_, name) for type_, name in self._args] =20 + def rust_decl_extern(self): + """Return a Rust argument list for an extern "C" function""" + return ", ".join((f"_{name}: {c_type_to_rust(type_)}" + for type_, name in self._args)) + + def rust_decl(self): + """Return a Rust argument list for a tracepoint function""" + def decl_type(type_): + if type_ =3D=3D "const char *": + return "&std::ffi::CStr" + return c_type_to_rust(type_) + + return ", ".join((f"_{name}: {decl_type(type_)}" + for type_, name in self._args)) + + def rust_call_extern(self): + """Return a Rust argument list for a call to an extern "C" functio= n""" + def rust_cast(name, type_): + if type_ =3D=3D "const char *": + return f"_{name}.as_ptr()" + return "_{name}" + + return ", ".join((rust_cast(name, type_) for type_, name in self._= args)) + + def rust_call_varargs(self): + """Return a Rust argument list for a call to a C varargs function"= "" + def rust_cast(name, type_): + if type_ =3D=3D "const char *": + return f"_{name}.as_ptr()" + + type_ =3D c_type_to_rust(type_) + if type_ in RUST_VARARGS_SMALL_TYPES: + return f"_{name} as std::ffi::c_int" + return f"_{name} /* as {type_} */" + + return ", ".join((rust_cast(name, type_) for type_, name in self._= args)) + =20 class Event(object): """Event description. diff --git a/scripts/tracetool/format/rs.py b/scripts/tracetool/format/rs.py new file mode 100644 index 00000000000..bc8b2be5971 --- /dev/null +++ b/scripts/tracetool/format/rs.py @@ -0,0 +1,76 @@ +# -*- coding: utf-8 -*- + +""" +trace-DIR.rs +""" + +__author__ =3D "Tanish Desai " +__copyright__ =3D "Copyright 2025, Tanish Desai " +__license__ =3D "GPL version 2 or (at your option) any later version" + +__maintainer__ =3D "Stefan Hajnoczi" +__email__ =3D "stefanha@redhat.com" + + +from tracetool import out + + +def generate(events, backend, group): + out('// This file is autogenerated by tracetool, do not edit.', + '', + '#[allow(unused_imports)]', + 'use std::ffi::c_char;', + '#[allow(unused_imports)]', + 'use qemu_api::bindings;', + '', + '#[inline(always)]', + 'fn trace_event_get_state_dynamic_by_id(_id: u16) -> bool {', + ' unsafe { (trace_events_enabled_count !=3D 0) && (_id !=3D 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('}') + + # static state + for e in events: + if 'disable' in e.properties: + enabled =3D "false" + else: + enabled =3D "true" + if "tcg-exec" in e.properties: + # a single define for the two "sub-events" + out('const _TRACE_%(name)s_ENABLED: bool =3D %(enabled)s;', + name=3De.original.name.upper(), + enabled=3Denabled) + out('const _TRACE_%s_ENABLED: bool =3D %s;' % (e.name.upper(), ena= bled)) + + backend.generate_begin(events, group) + + for e in events: + out('', + '#[inline(always)]', + '#[allow(dead_code)]', + 'pub fn %(api)s(%(args)s)', + '{', + api=3De.api(e.QEMU_TRACE), + args=3De.args.rust_decl()) + + if "disable" not in e.properties: + backend.generate(e, group, check_trace_event_get_state=3DFalse) + if backend.check_trace_event_get_state: + event_id =3D 'TRACE_' + e.name.upper() + out(' if trace_event_get_state_dynamic_by_id(unsafe { _= %(event_id)s_DSTATE}) {', + event_id =3D event_id, + api=3De.api()) + backend.generate(e, group, check_trace_event_get_state=3DT= rue) + out(' }') + out('}') + + backend.generate_end(events, group) --=20 2.50.1