4e66c9ef64
Store the input filename and line number in Event. A later patch will use this to improve error messages. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-Id: <20200827142915.108730-4-stefanha@redhat.com>
514 lines
15 KiB
Python
514 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Machinery for generating tracing-related intermediate files.
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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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import re
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import sys
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import weakref
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import tracetool.format
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import tracetool.backend
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import tracetool.transform
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def error_write(*lines):
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"""Write a set of error lines."""
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sys.stderr.writelines("\n".join(lines) + "\n")
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def error(*lines):
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"""Write a set of error lines and exit."""
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error_write(*lines)
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sys.exit(1)
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out_lineno = 1
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out_filename = '<none>'
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out_fobj = sys.stdout
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def out_open(filename):
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global out_filename, out_fobj
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out_filename = filename
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out_fobj = open(filename, 'wt')
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def out(*lines, **kwargs):
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"""Write a set of output lines.
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You can use kwargs as a shorthand for mapping variables when formatting all
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the strings in lines.
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The 'out_lineno' kwarg is automatically added to reflect the current output
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file line number. The 'out_next_lineno' kwarg is also automatically added
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with the next output line number. The 'out_filename' kwarg is automatically
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added with the output filename.
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"""
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global out_lineno
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output = []
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for l in lines:
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kwargs['out_lineno'] = out_lineno
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kwargs['out_next_lineno'] = out_lineno + 1
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kwargs['out_filename'] = out_filename
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output.append(l % kwargs)
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out_lineno += 1
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out_fobj.writelines("\n".join(output) + "\n")
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# We only want to allow standard C types or fixed sized
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# integer types. We don't want QEMU specific types
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# as we can't assume trace backends can resolve all the
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# typedefs
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ALLOWED_TYPES = [
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"int",
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"long",
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"short",
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"char",
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"bool",
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"unsigned",
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"signed",
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"int8_t",
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"uint8_t",
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"int16_t",
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"uint16_t",
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"int32_t",
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"uint32_t",
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"int64_t",
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"uint64_t",
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"void",
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"size_t",
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"ssize_t",
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"uintptr_t",
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"ptrdiff_t",
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# Magic substitution is done by tracetool
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"TCGv",
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]
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def validate_type(name):
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bits = name.split(" ")
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for bit in bits:
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bit = re.sub("\*", "", bit)
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if bit == "":
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continue
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if bit == "const":
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continue
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if bit not in ALLOWED_TYPES:
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raise ValueError("Argument type '%s' is not in whitelist. "
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"Only standard C types and fixed size integer "
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"types should be used. struct, union, and "
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"other complex pointer types should be "
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"declared as 'void *'" % name)
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class Arguments:
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"""Event arguments description."""
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def __init__(self, args):
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"""
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Parameters
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----------
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args :
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List of (type, name) tuples or Arguments objects.
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"""
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self._args = []
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for arg in args:
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if isinstance(arg, Arguments):
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self._args.extend(arg._args)
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else:
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self._args.append(arg)
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def copy(self):
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"""Create a new copy."""
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return Arguments(list(self._args))
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@staticmethod
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def build(arg_str):
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"""Build and Arguments instance from an argument string.
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Parameters
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----------
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arg_str : str
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String describing the event arguments.
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"""
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res = []
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for arg in arg_str.split(","):
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arg = arg.strip()
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if not arg:
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raise ValueError("Empty argument (did you forget to use 'void'?)")
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if arg == 'void':
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continue
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if '*' in arg:
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arg_type, identifier = arg.rsplit('*', 1)
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arg_type += '*'
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identifier = identifier.strip()
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else:
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arg_type, identifier = arg.rsplit(None, 1)
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validate_type(arg_type)
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res.append((arg_type, identifier))
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return Arguments(res)
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def __getitem__(self, index):
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if isinstance(index, slice):
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return Arguments(self._args[index])
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else:
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return self._args[index]
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def __iter__(self):
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"""Iterate over the (type, name) pairs."""
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return iter(self._args)
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def __len__(self):
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"""Number of arguments."""
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return len(self._args)
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def __str__(self):
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"""String suitable for declaring function arguments."""
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if len(self._args) == 0:
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return "void"
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else:
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return ", ".join([ " ".join([t, n]) for t,n in self._args ])
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def __repr__(self):
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"""Evaluable string representation for this object."""
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return "Arguments(\"%s\")" % str(self)
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def names(self):
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"""List of argument names."""
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return [ name for _, name in self._args ]
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def types(self):
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"""List of argument types."""
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return [ type_ for type_, _ in self._args ]
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def casted(self):
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"""List of argument names casted to their type."""
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return ["(%s)%s" % (type_, name) for type_, name in self._args]
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def transform(self, *trans):
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"""Return a new Arguments instance with transformed types.
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The types in the resulting Arguments instance are transformed according
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to tracetool.transform.transform_type.
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"""
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res = []
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for type_, name in self._args:
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res.append((tracetool.transform.transform_type(type_, *trans),
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name))
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return Arguments(res)
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class Event(object):
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"""Event description.
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Attributes
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----------
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name : str
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The event name.
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fmt : str
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The event format string.
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properties : set(str)
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Properties of the event.
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args : Arguments
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The event arguments.
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lineno : int
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The line number in the input file.
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filename : str
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The path to the input file.
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"""
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_CRE = re.compile("((?P<props>[\w\s]+)\s+)?"
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"(?P<name>\w+)"
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"\((?P<args>[^)]*)\)"
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"\s*"
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"(?:(?:(?P<fmt_trans>\".+),)?\s*(?P<fmt>\".+))?"
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"\s*")
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_VALID_PROPS = set(["disable", "tcg", "tcg-trans", "tcg-exec", "vcpu"])
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def __init__(self, name, props, fmt, args, lineno, filename, orig=None,
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event_trans=None, event_exec=None):
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"""
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Parameters
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----------
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name : string
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Event name.
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props : list of str
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Property names.
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fmt : str, list of str
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Event printing format string(s).
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args : Arguments
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Event arguments.
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lineno : int
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The line number in the input file.
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filename : str
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The path to the input file.
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orig : Event or None
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Original Event before transformation/generation.
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event_trans : Event or None
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Generated translation-time event ("tcg" property).
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event_exec : Event or None
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Generated execution-time event ("tcg" property).
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"""
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self.name = name
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self.properties = props
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self.fmt = fmt
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self.args = args
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self.lineno = int(lineno)
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self.filename = str(filename)
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self.event_trans = event_trans
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self.event_exec = event_exec
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if len(args) > 10:
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raise ValueError("Event '%s' has more than maximum permitted "
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"argument count" % name)
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if orig is None:
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self.original = weakref.ref(self)
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else:
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self.original = orig
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unknown_props = set(self.properties) - self._VALID_PROPS
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if len(unknown_props) > 0:
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raise ValueError("Unknown properties: %s"
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% ", ".join(unknown_props))
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assert isinstance(self.fmt, str) or len(self.fmt) == 2
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def copy(self):
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"""Create a new copy."""
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return Event(self.name, list(self.properties), self.fmt,
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self.args.copy(), self.lineno, self.filename,
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self, self.event_trans, self.event_exec)
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@staticmethod
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def build(line_str, lineno, filename):
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"""Build an Event instance from a string.
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Parameters
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----------
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line_str : str
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Line describing the event.
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lineno : int
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Line number in input file.
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filename : str
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Path to input file.
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"""
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m = Event._CRE.match(line_str)
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assert m is not None
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groups = m.groupdict('')
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name = groups["name"]
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props = groups["props"].split()
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fmt = groups["fmt"]
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fmt_trans = groups["fmt_trans"]
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if fmt.find("%m") != -1 or fmt_trans.find("%m") != -1:
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raise ValueError("Event format '%m' is forbidden, pass the error "
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"as an explicit trace argument")
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if fmt.endswith(r'\n"'):
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raise ValueError("Event format must not end with a newline "
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"character")
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if len(fmt_trans) > 0:
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fmt = [fmt_trans, fmt]
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args = Arguments.build(groups["args"])
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if "tcg-trans" in props:
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raise ValueError("Invalid property 'tcg-trans'")
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if "tcg-exec" in props:
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raise ValueError("Invalid property 'tcg-exec'")
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if "tcg" not in props and not isinstance(fmt, str):
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raise ValueError("Only events with 'tcg' property can have two format strings")
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if "tcg" in props and isinstance(fmt, str):
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raise ValueError("Events with 'tcg' property must have two format strings")
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event = Event(name, props, fmt, args, lineno, filename)
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# add implicit arguments when using the 'vcpu' property
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import tracetool.vcpu
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event = tracetool.vcpu.transform_event(event)
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return event
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def __repr__(self):
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"""Evaluable string representation for this object."""
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if isinstance(self.fmt, str):
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fmt = self.fmt
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else:
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fmt = "%s, %s" % (self.fmt[0], self.fmt[1])
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return "Event('%s %s(%s) %s')" % (" ".join(self.properties),
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self.name,
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self.args,
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fmt)
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# Star matching on PRI is dangerous as one might have multiple
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# arguments with that format, hence the non-greedy version of it.
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_FMT = re.compile("(%[\d\.]*\w+|%.*?PRI\S+)")
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def formats(self):
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"""List conversion specifiers in the argument print format string."""
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assert not isinstance(self.fmt, list)
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return self._FMT.findall(self.fmt)
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QEMU_TRACE = "trace_%(name)s"
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QEMU_TRACE_NOCHECK = "_nocheck__" + QEMU_TRACE
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QEMU_TRACE_TCG = QEMU_TRACE + "_tcg"
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QEMU_DSTATE = "_TRACE_%(NAME)s_DSTATE"
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QEMU_BACKEND_DSTATE = "TRACE_%(NAME)s_BACKEND_DSTATE"
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QEMU_EVENT = "_TRACE_%(NAME)s_EVENT"
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def api(self, fmt=None):
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if fmt is None:
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fmt = Event.QEMU_TRACE
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return fmt % {"name": self.name, "NAME": self.name.upper()}
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def transform(self, *trans):
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"""Return a new Event with transformed Arguments."""
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return Event(self.name,
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list(self.properties),
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self.fmt,
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self.args.transform(*trans),
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self.lineno,
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self.filename,
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self)
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def read_events(fobj, fname):
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"""Generate the output for the given (format, backends) pair.
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Parameters
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----------
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fobj : file
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Event description file.
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fname : str
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Name of event file
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Returns a list of Event objects
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"""
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events = []
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for lineno, line in enumerate(fobj, 1):
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if line[-1] != '\n':
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raise ValueError("%s does not end with a new line" % fname)
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if not line.strip():
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continue
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if line.lstrip().startswith('#'):
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continue
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try:
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event = Event.build(line, lineno, fname)
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except ValueError as e:
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arg0 = 'Error at %s:%d: %s' % (fname, lineno, e.args[0])
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e.args = (arg0,) + e.args[1:]
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raise
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# transform TCG-enabled events
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if "tcg" not in event.properties:
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events.append(event)
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else:
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event_trans = event.copy()
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event_trans.name += "_trans"
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event_trans.properties += ["tcg-trans"]
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event_trans.fmt = event.fmt[0]
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# ignore TCG arguments
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args_trans = []
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for atrans, aorig in zip(
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event_trans.transform(tracetool.transform.TCG_2_HOST).args,
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event.args):
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if atrans == aorig:
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args_trans.append(atrans)
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event_trans.args = Arguments(args_trans)
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event_exec = event.copy()
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event_exec.name += "_exec"
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event_exec.properties += ["tcg-exec"]
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event_exec.fmt = event.fmt[1]
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event_exec.args = event_exec.args.transform(tracetool.transform.TCG_2_HOST)
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new_event = [event_trans, event_exec]
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event.event_trans, event.event_exec = new_event
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events.extend(new_event)
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return events
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class TracetoolError (Exception):
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"""Exception for calls to generate."""
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pass
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def try_import(mod_name, attr_name=None, attr_default=None):
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"""Try to import a module and get an attribute from it.
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Parameters
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----------
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mod_name : str
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Module name.
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attr_name : str, optional
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Name of an attribute in the module.
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attr_default : optional
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Default value if the attribute does not exist in the module.
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Returns
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-------
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A pair indicating whether the module could be imported and the module or
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object or attribute value.
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"""
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try:
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module = __import__(mod_name, globals(), locals(), ["__package__"])
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if attr_name is None:
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return True, module
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return True, getattr(module, str(attr_name), attr_default)
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except ImportError:
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return False, None
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def generate(events, group, format, backends,
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binary=None, probe_prefix=None):
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"""Generate the output for the given (format, backends) pair.
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Parameters
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----------
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events : list
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list of Event objects to generate for
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group: str
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Name of the tracing group
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format : str
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Output format name.
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backends : list
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Output backend names.
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binary : str or None
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See tracetool.backend.dtrace.BINARY.
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probe_prefix : str or None
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See tracetool.backend.dtrace.PROBEPREFIX.
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"""
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# fix strange python error (UnboundLocalError tracetool)
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import tracetool
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format = str(format)
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if len(format) == 0:
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raise TracetoolError("format not set")
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if not tracetool.format.exists(format):
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raise TracetoolError("unknown format: %s" % format)
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if len(backends) == 0:
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raise TracetoolError("no backends specified")
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for backend in backends:
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if not tracetool.backend.exists(backend):
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raise TracetoolError("unknown backend: %s" % backend)
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backend = tracetool.backend.Wrapper(backends, format)
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import tracetool.backend.dtrace
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tracetool.backend.dtrace.BINARY = binary
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tracetool.backend.dtrace.PROBEPREFIX = probe_prefix
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tracetool.format.generate(events, format, backend, group)
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