--- /dev/null
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Machinery for generating tracing-related intermediate files.
+"""
+
+__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
+__license__ = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__ = "stefanha@linux.vnet.ibm.com"
+
+
+import re
+import sys
+import weakref
+
+import tracetool.format
+import tracetool.backend
+import tracetool.transform
+
+
+def error_write(*lines):
+ """Write a set of error lines."""
+ sys.stderr.writelines("\n".join(lines) + "\n")
+
+def error(*lines):
+ """Write a set of error lines and exit."""
+ error_write(*lines)
+ sys.exit(1)
+
+
+def out(*lines, **kwargs):
+ """Write a set of output lines.
+
+ You can use kwargs as a shorthand for mapping variables when formating all
+ the strings in lines.
+ """
+ lines = [ l % kwargs for l in lines ]
+ sys.stdout.writelines("\n".join(lines) + "\n")
+
+
+class Arguments:
+ """Event arguments description."""
+
+ def __init__(self, args):
+ """
+ Parameters
+ ----------
+ args :
+ List of (type, name) tuples.
+ """
+ self._args = args
+
+ def copy(self):
+ """Create a new copy."""
+ return Arguments(list(self._args))
+
+ @staticmethod
+ def build(arg_str):
+ """Build and Arguments instance from an argument string.
+
+ Parameters
+ ----------
+ arg_str : str
+ String describing the event arguments.
+ """
+ res = []
+ for arg in arg_str.split(","):
+ arg = arg.strip()
+ if arg == 'void':
+ continue
+
+ if '*' in arg:
+ arg_type, identifier = arg.rsplit('*', 1)
+ arg_type += '*'
+ identifier = identifier.strip()
+ else:
+ arg_type, identifier = arg.rsplit(None, 1)
+
+ res.append((arg_type, identifier))
+ return Arguments(res)
+
+ def __iter__(self):
+ """Iterate over the (type, name) pairs."""
+ return iter(self._args)
+
+ def __len__(self):
+ """Number of arguments."""
+ return len(self._args)
+
+ def __str__(self):
+ """String suitable for declaring function arguments."""
+ if len(self._args) == 0:
+ return "void"
+ else:
+ return ", ".join([ " ".join([t, n]) for t,n in self._args ])
+
+ def __repr__(self):
+ """Evaluable string representation for this object."""
+ return "Arguments(\"%s\")" % str(self)
+
+ def names(self):
+ """List of argument names."""
+ return [ name for _, name in self._args ]
+
+ def types(self):
+ """List of argument types."""
+ return [ type_ for type_, _ in self._args ]
+
+ def transform(self, *trans):
+ """Return a new Arguments instance with transformed types.
+
+ The types in the resulting Arguments instance are transformed according
+ to tracetool.transform.transform_type.
+ """
+ res = []
+ for type_, name in self._args:
+ res.append((tracetool.transform.transform_type(type_, *trans),
+ name))
+ return Arguments(res)
+
+
+class Event(object):
+ """Event description.
+
+ Attributes
+ ----------
+ name : str
+ The event name.
+ fmt : str
+ The event format string.
+ properties : set(str)
+ Properties of the event.
+ args : Arguments
+ The event arguments.
+
+ """
+
+ _CRE = re.compile("((?P<props>[\w\s]+)\s+)?"
+ "(?P<name>\w+)"
+ "\((?P<args>[^)]*)\)"
+ "\s*"
+ "(?:(?:(?P<fmt_trans>\".+),)?\s*(?P<fmt>\".+))?"
+ "\s*")
+
+ _VALID_PROPS = set(["disable", "tcg", "tcg-trans", "tcg-exec"])
+
+ def __init__(self, name, props, fmt, args, orig=None):
+ """
+ Parameters
+ ----------
+ name : string
+ Event name.
+ props : list of str
+ Property names.
+ fmt : str, list of str
+ Event printing format (or formats).
+ args : Arguments
+ Event arguments.
+ orig : Event or None
+ Original Event before transformation.
+
+ """
+ self.name = name
+ self.properties = props
+ self.fmt = fmt
+ self.args = args
+
+ if orig is None:
+ self.original = weakref.ref(self)
+ else:
+ self.original = orig
+
+ unknown_props = set(self.properties) - self._VALID_PROPS
+ if len(unknown_props) > 0:
+ raise ValueError("Unknown properties: %s"
+ % ", ".join(unknown_props))
+ assert isinstance(self.fmt, str) or len(self.fmt) == 2
+
+ def copy(self):
+ """Create a new copy."""
+ return Event(self.name, list(self.properties), self.fmt,
+ self.args.copy(), self)
+
+ @staticmethod
+ def build(line_str):
+ """Build an Event instance from a string.
+
+ Parameters
+ ----------
+ line_str : str
+ Line describing the event.
+ """
+ m = Event._CRE.match(line_str)
+ assert m is not None
+ groups = m.groupdict('')
+
+ name = groups["name"]
+ props = groups["props"].split()
+ fmt = groups["fmt"]
+ fmt_trans = groups["fmt_trans"]
+ if len(fmt_trans) > 0:
+ fmt = [fmt_trans, fmt]
+ args = Arguments.build(groups["args"])
+
+ if "tcg-trans" in props:
+ raise ValueError("Invalid property 'tcg-trans'")
+ if "tcg-exec" in props:
+ raise ValueError("Invalid property 'tcg-exec'")
+ if "tcg" not in props and not isinstance(fmt, str):
+ raise ValueError("Only events with 'tcg' property can have two formats")
+ if "tcg" in props and isinstance(fmt, str):
+ raise ValueError("Events with 'tcg' property must have two formats")
+
+ return Event(name, props, fmt, args)
+
+ def __repr__(self):
+ """Evaluable string representation for this object."""
+ if isinstance(self.fmt, str):
+ fmt = self.fmt
+ else:
+ fmt = "%s, %s" % (self.fmt[0], self.fmt[1])
+ return "Event('%s %s(%s) %s')" % (" ".join(self.properties),
+ self.name,
+ self.args,
+ fmt)
+
+ _FMT = re.compile("(%[\d\.]*\w+|%.*PRI\S+)")
+
+ def formats(self):
+ """List of argument print formats."""
+ assert not isinstance(self.fmt, list)
+ return self._FMT.findall(self.fmt)
+
+ QEMU_TRACE = "trace_%(name)s"
+ QEMU_TRACE_TCG = QEMU_TRACE + "_tcg"
+
+ def api(self, fmt=None):
+ if fmt is None:
+ fmt = Event.QEMU_TRACE
+ return fmt % {"name": self.name}
+
+ def transform(self, *trans):
+ """Return a new Event with transformed Arguments."""
+ return Event(self.name,
+ list(self.properties),
+ self.fmt,
+ self.args.transform(*trans),
+ self)
+
+
+def _read_events(fobj):
+ events = []
+ for line in fobj:
+ if not line.strip():
+ continue
+ if line.lstrip().startswith('#'):
+ continue
+
+ event = Event.build(line)
+
+ # transform TCG-enabled events
+ if "tcg" not in event.properties:
+ events.append(event)
+ else:
+ event_trans = event.copy()
+ event_trans.name += "_trans"
+ event_trans.properties += ["tcg-trans"]
+ event_trans.fmt = event.fmt[0]
+ args_trans = []
+ for atrans, aorig in zip(
+ event_trans.transform(tracetool.transform.TCG_2_HOST).args,
+ event.args):
+ if atrans == aorig:
+ args_trans.append(atrans)
+ event_trans.args = Arguments(args_trans)
+ event_trans = event_trans.copy()
+
+ event_exec = event.copy()
+ event_exec.name += "_exec"
+ event_exec.properties += ["tcg-exec"]
+ event_exec.fmt = event.fmt[1]
+ event_exec = event_exec.transform(tracetool.transform.TCG_2_HOST)
+
+ new_event = [event_trans, event_exec]
+ event.event_trans, event.event_exec = new_event
+
+ events.extend(new_event)
+
+ return events
+
+
+class TracetoolError (Exception):
+ """Exception for calls to generate."""
+ pass
+
+
+def try_import(mod_name, attr_name=None, attr_default=None):
+ """Try to import a module and get an attribute from it.
+
+ Parameters
+ ----------
+ mod_name : str
+ Module name.
+ attr_name : str, optional
+ Name of an attribute in the module.
+ attr_default : optional
+ Default value if the attribute does not exist in the module.
+
+ Returns
+ -------
+ A pair indicating whether the module could be imported and the module or
+ object or attribute value.
+ """
+ try:
+ module = __import__(mod_name, globals(), locals(), ["__package__"])
+ if attr_name is None:
+ return True, module
+ return True, getattr(module, str(attr_name), attr_default)
+ except ImportError:
+ return False, None
+
+
+def generate(fevents, format, backends,
+ binary=None, probe_prefix=None):
+ """Generate the output for the given (format, backends) pair.
+
+ Parameters
+ ----------
+ fevents : file
+ Event description file.
+ format : str
+ Output format name.
+ backends : list
+ Output backend names.
+ binary : str or None
+ See tracetool.backend.dtrace.BINARY.
+ probe_prefix : str or None
+ See tracetool.backend.dtrace.PROBEPREFIX.
+ """
+ # fix strange python error (UnboundLocalError tracetool)
+ import tracetool
+
+ format = str(format)
+ if len(format) is 0:
+ raise TracetoolError("format not set")
+ if not tracetool.format.exists(format):
+ raise TracetoolError("unknown format: %s" % format)
+
+ if len(backends) is 0:
+ raise TracetoolError("no backends specified")
+ for backend in backends:
+ if not tracetool.backend.exists(backend):
+ raise TracetoolError("unknown backend: %s" % backend)
+ backend = tracetool.backend.Wrapper(backends, format)
+
+ import tracetool.backend.dtrace
+ tracetool.backend.dtrace.BINARY = binary
+ tracetool.backend.dtrace.PROBEPREFIX = probe_prefix
+
+ events = _read_events(fevents)
+
+ tracetool.format.generate(events, format, backend)
Code Review / kvmfornfv.git / blobdiff