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Fix CompareTrees to not compare unstable functions as equal.

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Sei Lisa 2017-10-21 10:44:09 +02:00
parent 4d92cc8838
commit e6b23a2d7a
1 changed files with 2 additions and 4 deletions
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6
lslopt/lslfoldconst.py
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@ -149,10 +149,7 @@ class foldconst(object):
def CompareTrees(self, node1, node2):
"""Try to compare two subtrees to see if they are equivalent."""
# They MUST be SEF
# FIXME: They must also be stable, i.e. return the same value
# in two successive calls with a certain degree of certainty.
# Counterexamples are llFrand, llGetTimestamp.
# They MUST be SEF and stable.
if 'SEF' not in node1 or 'SEF' not in node2:
return False
# So far it's only accepted if both are identifiers or function calls,
@ -162,6 +159,7 @@ class foldconst(object):
and node1['scope'] == node2['scope']
or node1['nt'] == node2['nt'] == 'FNCALL'
and node1['name'] == node2['name']
and 'uns' not in self.symtab[0][node1['name']]
and all(self.CompareTrees(node1['ch'][i],
node2['ch'][i])
for i in xrange(len(node1['ch'])))