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Remove jumps that just go to the next statement

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This might help a bit with switch().
This commit is contained in:
Sei Lisa 2018-05-17 09:46:06 +02:00
parent 285c7172fd
commit 89c627b0c0
1 changed files with 41 additions and 5 deletions
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46
lslopt/lslfoldconst.py
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@ -1562,18 +1562,54 @@ class foldconst(object):
if nt == '{}':
# Remove SEF statements, and mark as SEF if it ends up empty
idx = 0
issef = True
while idx < len(child):
nchild = len(child)
while idx < nchild:
self.FoldTree(child, idx)
self.FoldStmt(child, idx)
if child[idx].SEF:
# SEF statements can be removed
del child[idx]
nchild -= 1
else:
idx += 1
issef = False
if issef:
node.SEF = True
# Make another pass to remove JUMPs to the next statement
changed = True # Allow entering the loop
while changed:
changed = False
idx = 0
while idx < nchild:
advance = 1
if child[idx].nt == 'JUMP':
idx2 = idx + 1
while idx2 < nchild:
# Search for a label that is the destination of this
# JUMP, skipping other labels
if child[idx2].nt != '@':
break
if (child[idx].scope == child[idx2].scope
and child[idx].name == child[idx2].name
):
sym = self.symtab[child[idx].scope][child[idx].name]
# remove the JUMP
del child[idx]
advance = 0
changed = True
idx2 -= 1 # it has scrolled
nchild -= 1
# remove reference to label
assert(sym['ref'])
sym['ref'] -= 1
if sym['ref'] == 0:
# No longer referenced - delete label too
del child[idx2]
nchild -= 1
break
idx2 += 1
del idx2
idx += advance
# We're SEF if we're empty, as we've removed all SEF statements
node.SEF = nchild == 0
return
if nt == 'IF':