tracetool: add input filename and line number to Event

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>

scripts/tracetool/__init__.py

@@ -218,6 +218,10 @@ class Event(object):
         Properties of the event.
     args : Arguments
         The event arguments.
+    lineno : int
+        The line number in the input file.
+    filename : str
+        The path to the input file.
 
     """
 
@@ -230,7 +234,7 @@ class Event(object):
 
     _VALID_PROPS = set(["disable", "tcg", "tcg-trans", "tcg-exec", "vcpu"])
 
-    def __init__(self, name, props, fmt, args, orig=None,
+    def __init__(self, name, props, fmt, args, lineno, filename, orig=None,
                  event_trans=None, event_exec=None):
         """
         Parameters
@@ -243,6 +247,10 @@ class Event(object):
             Event printing format string(s).
         args : Arguments
             Event arguments.
+        lineno : int
+            The line number in the input file.
+        filename : str
+            The path to the input file.
         orig : Event or None
             Original Event before transformation/generation.
         event_trans : Event or None
@@ -255,6 +263,8 @@ class Event(object):
         self.properties = props
         self.fmt = fmt
         self.args = args
+        self.lineno = int(lineno)
+        self.filename = str(filename)
         self.event_trans = event_trans
         self.event_exec = event_exec
 
@@ -276,16 +286,21 @@ class Event(object):
     def copy(self):
         """Create a new copy."""
         return Event(self.name, list(self.properties), self.fmt,
-                     self.args.copy(), self, self.event_trans, self.event_exec)
+                     self.args.copy(), self.lineno, self.filename,
+                     self, self.event_trans, self.event_exec)
 
     @staticmethod
-    def build(line_str):
+    def build(line_str, lineno, filename):
         """Build an Event instance from a string.
 
         Parameters
         ----------
         line_str : str
             Line describing the event.
+        lineno : int
+            Line number in input file.
+        filename : str
+            Path to input file.
         """
         m = Event._CRE.match(line_str)
         assert m is not None
@@ -315,7 +330,7 @@ class Event(object):
         if "tcg" in props and isinstance(fmt, str):
             raise ValueError("Events with 'tcg' property must have two format strings")
 
-        event = Event(name, props, fmt, args)
+        event = Event(name, props, fmt, args, lineno, filename)
 
         # add implicit arguments when using the 'vcpu' property
         import tracetool.vcpu
@@ -360,6 +375,8 @@ class Event(object):
                      list(self.properties),
                      self.fmt,
                      self.args.transform(*trans),
+                     self.lineno,
+                     self.filename,
                      self)
 
 
@@ -386,7 +403,7 @@ def read_events(fobj, fname):
             continue
 
         try:
-            event = Event.build(line)
+            event = Event.build(line, lineno, fname)
         except ValueError as e:
             arg0 = 'Error at %s:%d: %s' % (fname, lineno, e.args[0])
             e.args = (arg0,) + e.args[1:]