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Move side-effect-free check for functions to a method.

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This will in future allow us to check argument-dependent SEFness.
This commit is contained in:
Sei Lisa 2017-10-25 19:24:12 +02:00
parent 0bbfb08234
commit 22e057e2ec
1 changed files with 13 additions and 3 deletions
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16
lslopt/lslfoldconst.py
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@ -168,6 +168,14 @@ class foldconst(object):
and self.CompareTrees(node1['ch'][0], node2['ch'][0])
)
def FnSEF(self, node):
'''Applied to function call nodes, return whether the node corresponds
to a SEF function.
'''
assert node['nt'] == 'FNCALL'
sym = self.symtab[0][node['name']]
return 'SEF' in sym and sym['SEF'] is True
def FoldStmt(self, parent, index):
"""Simplify a statement."""
node = parent[index]
@ -198,7 +206,9 @@ class foldconst(object):
# If the statement is a function call and the function is marked as SEF
# at this point, it means the arguments are not SEF. Replace the node
# in that case with a block.
if node['nt'] == 'FNCALL' and 'SEF' in self.symtab[0][node['name']] and 'Loc' in self.symtab[0][node['name']]:
if (node['nt'] == 'FNCALL' and 'Loc' in self.symtab[0][node['name']]
and self.FnSEF(node)
):
parent[index] = {'nt':'{}', 't':None, 'ch':
[{'nt':'EXPR','t':x['t'],'ch':[x]} for x in node['ch']]}
self.FoldTree(parent, index)
@ -1314,7 +1324,7 @@ class foldconst(object):
sym = self.symtab[0][name]
OptimizeArgs(node, sym)
try:
if 'Fn' in sym and ('SEF' in sym or lslcommon.IsCalc):
if 'Fn' in sym and (self.FnSEF(node) or lslcommon.IsCalc):
# It's side-effect free if the children are and the function
# is marked as SEF.
if SEFargs:
@ -1383,7 +1393,7 @@ class foldconst(object):
return
if nt == 'FNDEF':
# used when folding llDetected* function calls
# CurEvent is needed when folding llDetected* function calls
if 'scope' in node:
# function definition
self.CurEvent = None