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[Qemu-devel] [PATCH] qom: avoid reporting errors for NULL error object
From: |
Daniel P . Berrangé |
Subject: |
[Qemu-devel] [PATCH] qom: avoid reporting errors for NULL error object |
Date: |
Mon, 19 Nov 2018 13:59:03 +0000 |
When debugging QEMU it is often useful to put a breakpoint on the
error_setg_internal method impl.
Unfortunately the object_property_add / object_class_property_add
methods call object_property_find / object_class_property_find methods
to check if a property exists already before adding the new property.
As a result there are a huge number of calls to error_setg_internal
on startup of most QEMU commands, making it very painful to set a
breakpoint on this method.
This puts a minor optimization on the code so that we avoid calling
error_setg() when errp is NULL. Functionally there's no difference
since error_setg() is a no-op when errp is NULL, but this lets us
use breakpoints in GDB in a practical way.
Signed-off-by: Daniel P. Berrangé <address@hidden>
---
qom/object.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/qom/object.c b/qom/object.c
index 547dcf97c3..ddd5e7a30e 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -1087,7 +1087,12 @@ ObjectProperty *object_property_find(Object *obj, const
char *name,
return prop;
}
- error_setg(errp, "Property '.%s' not found", name);
+ /* Optimized to avoid calling error_setg if errp == NULL
+ * otherwise every property add call hits error_setg
+ * making it impratical to set breakpoints in GDB */
+ if (errp) {
+ error_setg(errp, "Property '.%s' not found", name);
+ }
return NULL;
}
@@ -1133,7 +1138,10 @@ ObjectProperty *object_class_property_find(ObjectClass
*klass, const char *name,
}
prop = g_hash_table_lookup(klass->properties, name);
- if (!prop) {
+ /* Optimized to avoid calling error_setg if errp == NULL
+ * otherwise every property add call hits error_setg
+ * making it impratical to set breakpoints in GDB */
+ if (!prop && errp) {
error_setg(errp, "Property '.%s' not found", name);
}
return prop;
--
2.19.1
- [Qemu-devel] [PATCH] qom: avoid reporting errors for NULL error object,
Daniel P . Berrangé <=