[Qemu-devel] [PATCH trace] Avoid all systemtap reserved words

[Qemu-devel] [PATCH trace] Avoid all systemtap reserved words

[Daniel P. Berrange]

From: "Daniel P. Berrange" <berrange@redhat.com>

Over time various systemtap reserved words have been blacklisted
in the trace backend generator. The list is not complete though,
so there is continued risk of problems in the future. Preempt
such problems by specifying the full list of systemtap keywords
listed in its parser as identified here:

  http://sourceware.org/ml/systemtap/2012-q4/msg00157.html

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 scripts/tracetool/backend/dtrace.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/scripts/tracetool/backend/dtrace.py b/scripts/tracetool/backend/dtrace.py
index 6be7047..23c43e2 100644
--- a/scripts/tracetool/backend/dtrace.py
+++ b/scripts/tracetool/backend/dtrace.py
@@ -73,6 +73,15 @@ def d(events):
         '};')
 
 
+# Technically 'self' is not used by systemtap yet, but
+# they recommended we keep it in the reserved list anyway
+RESERVED_WORDS = (
+    'break', 'catch', 'continue', 'delete', 'else', 'for',
+    'foreach', 'function', 'global', 'if', 'in', 'limit',
+    'long', 'next', 'probe', 'return', 'self', 'string',
+    'try', 'while'
+    )
+
 def stap(events):
     for e in events:
         # Define prototype for probe arguments
@@ -87,7 +96,7 @@ def stap(events):
         if len(e.args) > 0:
             for name in e.args.names():
                 # Append underscore to reserved keywords
-                if name in ('limit', 'in', 'next', 'self', 'function'):
+                if name in RESERVED_WORDS:
                     name += '_'
                 out('  %s = $arg%d;' % (name, i))
                 i += 1
-- 
1.7.11.7

Re: [Qemu-devel] [PATCH trace] Avoid all systemtap reserved words

[Stefan Hajnoczi]

On Fri, Nov 02, 2012 at 12:00:53PM +0000, Daniel P. Berrange wrote:
> From: "Daniel P. Berrange" <berrange@redhat.com>
> 
> Over time various systemtap reserved words have been blacklisted
> in the trace backend generator. The list is not complete though,
> so there is continued risk of problems in the future. Preempt
> such problems by specifying the full list of systemtap keywords
> listed in its parser as identified here:
> 
>   http://sourceware.org/ml/systemtap/2012-q4/msg00157.html
> 
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> ---
>  scripts/tracetool/backend/dtrace.py | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)

Thanks, applied to the tracing tree:
https://github.com/stefanha/qemu/commits/tracing

Stefan