[Qemu-devel] [PATCH v9 1/7] trace: Extend API to manage event arguments

From: "Lluís Vilanova" <vilanova@ac.upc.edu>
To: qemu-devel@nongnu.org
Cc: "Alex Bennée" <alex.bennee@linaro.org>,
	"Eduardo Habkost" <ehabkost@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>
Subject: [Qemu-devel] [PATCH v9 1/7] trace: Extend API to manage event arguments
Date: Thu, 25 Feb 2016 17:43:04 +0100	[thread overview]
Message-ID: <145641858432.30295.3069911069472672646.stgit@localhost> (raw)
In-Reply-To: <145641857632.30295.407142116443473458.stgit@localhost>

Lets the user manage event arguments as a list, and simplifies argument
concatenation.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 scripts/tracetool/__init__.py |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index 181675f..0663e7f 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -50,9 +50,14 @@ class Arguments:
         Parameters
         ----------
         args :
-            List of (type, name) tuples.
+            List of (type, name) tuples or Arguments objects.
         """
-        self._args = args
+        self._args = []
+        for arg in args:
+            if isinstance(arg, Arguments):
+                self._args.extend(arg._args)
+            else:
+                self._args.append(arg)
 
     def copy(self):
         """Create a new copy."""
@@ -83,6 +88,12 @@ class Arguments:
             res.append((arg_type, identifier))
         return Arguments(res)
 
+    def __getitem__(self, index):
+        if isinstance(index, slice):
+            return Arguments(self._args[index])
+        else:
+            return self._args[index]
+
     def __iter__(self):
         """Iterate over the (type, name) pairs."""
         return iter(self._args)
