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Be a bit smarter when optimizing out default labels.

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(Was a TODO item). Also cosmetic changes.
This commit is contained in:
Sei Lisa 2016-05-08 03:55:55 +02:00
parent 3669bbb06e
commit 91ad438bb7
1 changed files with 16 additions and 11 deletions
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27
lslopt/lslparse.py
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@ -1695,21 +1695,26 @@ list lazy_list_set(list L, integer i, list v)
if switchcasedefault is None:
if self.errmissingdefault:
raise EParseMissingDefault(self)
# Check if it's worth adding a break. If there's no executable
# code, there's no point. However, this check is insufficient.
# It misses SEF expressions. For that reason, this is best left
# up to a later optimizer that knows about SEF. But we do a
# preliminary elimination here.
# Check if it's worth adding a break label. If there's no
# executable code, there's no point. However, this check is
# insufficient. It misses SEF expressions. For that reason,
# this is best left up to a later optimizer that knows about
# SEF. But we do a preliminary elimination here.
if self.does_something(blk):
switchcasedefault = brk
self.breakstack[-1][2] = True
else:
# TODO: Keep checking until there's output-generating code.
# For example, this isn't optimized due to the semicolon:
# switch(1) { ; default: 1; }
if blk and blk[0]['nt'] == '@' and blk[0]['name'] == switchcasedefault:
switchcasedefault = None
del blk[0]
# Check if no code up to the default label does anything.
# If so, remove the label and don't generate the jump.
for i in xrange(len(blk)):
node = blk[i]
if node['nt'] == '@' and node['name'] == switchcasedefault:
switchcasedefault = None
del blk[i]
break
if self.does_something([node]):
break
del i, node
if switchcasedefault is not None:
prelude.append({'nt':'JUMP', 't':None, 'name':switchcasedefault,