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checker: ignore fields marked unused 

While comparing qemu-1.0 json output with qemu-2.1, a few fields got
marked unused.  These need to be skipped over, and not flagged as
mismatches.

For handling unused fields, the exact number of bytes need to be skipped
over as the size of the unused field.

Currently, only the term "unused" is matched.  When more field names
turn up, this will have to be updated based on the whitelist matching
method to match more such terms.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Amit Shah 2014-07-22 13:06:25 +05:30
parent bb9c3636d9
commit 32ce1b4817
1 changed files with 50 additions and 4 deletions
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54
scripts/vmstate-static-checker.py
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@ -144,6 +144,7 @@ def check_fields(src_fields, dest_fields, desc, sec):
advance_src = True
advance_dest = True
unused_count = 0
while True:
if advance_src:
@ -156,9 +157,10 @@ def check_fields(src_fields, dest_fields, desc, sec):
s_iter = s_iter_list.pop()
continue
else:
# We want to avoid advancing just once -- when entering a
# dest substruct, or when exiting one.
advance_src = True
if unused_count == 0:
# We want to avoid advancing just once -- when entering a
# dest substruct, or when exiting one.
advance_src = True
if advance_dest:
try:
@ -177,7 +179,37 @@ def check_fields(src_fields, dest_fields, desc, sec):
advance_src = False
continue
else:
advance_dest = True
if unused_count == 0:
advance_dest = True
if unused_count > 0:
if advance_dest == False:
unused_count = unused_count - s_item["size"]
if unused_count == 0:
advance_dest = True
continue
if unused_count < 0:
print "Section \"" + sec + "\",",
print "Description \"" + desc + "\":",
print "unused size mismatch near \"",
print s_item["field"] + "\""
bump_taint()
break
continue
if advance_src == False:
unused_count = unused_count - d_item["size"]
if unused_count == 0:
advance_src = True
continue
if unused_count < 0:
print "Section \"" + sec + "\",",
print "Description \"" + desc + "\":",
print "unused size mismatch near \"",
print d_item["field"] + "\""
bump_taint()
break
continue
if not check_fields_match(desc, s_item["field"], d_item["field"]):
# Some fields were put in substructs, keeping the
@ -208,6 +240,20 @@ def check_fields(src_fields, dest_fields, desc, sec):
advance_dest = False
continue
if s_item["field"] == "unused" or d_item["field"] == "unused":
if s_item["size"] == d_item["size"]:
continue
if d_item["field"] == "unused":
advance_dest = False
unused_count = d_item["size"] - s_item["size"]
continue
if s_item["field"] == "unused":
advance_src = False
unused_count = s_item["size"] - d_item["size"]
continue
print "Section \"" + sec + "\",",
print "Description \"" + desc + "\":",
print "expected field \"" + s_item["field"] + "\",",