AriasCreations/LSL-PyOptimizer
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Bunch of bug fixes.

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This commit is contained in:
Sei Lisa 2014-07-27 18:07:35 +02:00
parent f1656c41aa
commit c483d5ea71
1 changed files with 37 additions and 13 deletions
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50
lslopt/lsloptimizer.py
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@ -1,6 +1,6 @@
import lslfuncs
from lslparse import S
from lslparse import S, warning
CONSTANT = S['CONSTANT']
@ -135,20 +135,42 @@ class optimizer(object):
elif code[0] == '-' and code[2][1] in ('integer', 'float') and code[3][1] in ('integer', 'float'):
# Change - to + - for int/float
if code[3][0] == CONSTANT:
code[3][2] = lslfuncs.neg(code[3][2])
if code[3][2] == 0:
code[:] = code[2]
else:
code[0] = S['+']
code[3][2] = lslfuncs.neg(code[3][2])
else:
code[:] = [S['+'], code[1], code[2], [S['NEG'], code[3][1], code[3]]]
elif code[0] == '<<' and code[3][0] == CONSTANT:
# Transforming << into multiply saves some bytes.
if code[2][0] in ('+', '-', 'NEG'): # operands with priority between * and <<
code[2] = [S['()'], code[2][1], code[2]]
code[:] = [S['*'], code[1], code[2], 1<<(code[3][2] & 31)]
if not (code[3][2] & 31):
code[:] = code[2]
else:
code[:] = [S['*'], code[1], code[2], [CONSTANT, 'integer', 1<<(code[3][2] & 31)]]
else:
pass # TODO: Eliminate redundancy (x+0, x*1, x*-1, v+ZERO_VECTOR, perhaps x-1=~-x, etc.)
# Note some cases e.g. x*0 can't be optimized away without side-effect analysis.
# But some cases like %1 can be turned into *0 to save bytes.
return
if code0 in self.assign_ops:
# TODO: Eliminate redundant operations, e.g. a += 0; etc.
self.FoldTree(code[3])
return
if code0 == 'IDENT':
if self.globalmode:
if code[1] != 'key' and self.symtab[code[3]][code[2]][2] is not None:
code[:] = [CONSTANT, code[1], self.symtab[code[2]][2]]
val = self.symtab[code[3]][code[2]][2]
if val is not None:
# WARNING: Possible reference loop here
# TODO: Break reference loop by only accepting globals in order
# of definition during parsing.
self.FoldTree(val)
if code[1] != 'key' and val is not None:
code[:] = [CONSTANT, code[1], val]
return
if code0 == 'FUNCTION':
@ -295,19 +317,15 @@ class optimizer(object):
self.FoldTree(expr)
return
if code0 in self.assign_ops:
self.FoldTree(code[3])
return
if code0 in ('V++','V--','--V','++V'):
return
raise Exception('Internal error: This should not happen, node = ' + code0)
def Fold(self, code, IsGlobal = True):
assert type(code[2]) == tuple
assert type(code) == tuple
self.globalmode = IsGlobal and len(code) == 3
self.FoldTree(code[2])
self.FoldTree(code)
del self.globalmode
def optimize(self, symtab, functions):
@ -324,6 +342,12 @@ class optimizer(object):
entry = symtab[0][name]
if entry[1] == 'State':
for event in entry[2]:
self.Fold(entry[2][event], False)
self.Fold(entry[2][event][2], False)
elif type(entry[2]) == tuple:
self.Fold(entry) # global
self.Fold(entry[2]) # global
val = entry[2]
# Unfold constant
if val[0] == 'EXPR' and val[2][0] == CONSTANT:
symtab[0][name] = entry[:2] + (val[2][2],) + entry[3:]
else:
warning(u'Expression does not collapse to a single constant.')