mirror of
https://github.com/Sei-Lisa/LSL-PyOptimizer
synced 2025-07-23 04:59:34 -07:00
Add a bunch of optimizations. Fix || and && results.
Notably, addition/subtraction, and llGetListLength -> !=[] But also parenthesis removal etc. With test coverage.
This commit is contained in:
Sei Lisa
parent
0a567b0a39
commit
6ec39aa745
2 changed files with 237 additions and 35 deletions
|
|
@ -39,6 +39,13 @@ class optimizer(object):
|
|||
if parent[index]['nt'] in ('CONST', 'IDENT', 'FIELD'):
|
||||
parent[index] = {'nt':';','t':None}
|
||||
|
||||
def Cast(self, value, newtype):
|
||||
# Return a CAST node if the types are not equal, otherwise the
|
||||
# value unchanged
|
||||
if value['t'] == newtype:
|
||||
return value
|
||||
return {'nt':'CAST', 't':newtype, 'ch':[value]}
|
||||
|
||||
def FoldTree(self, parent, index):
|
||||
"""Recursively traverse the tree to fold constants, changing it in
|
||||
place.
|
||||
|
|
@ -68,35 +75,53 @@ class optimizer(object):
|
|||
|
||||
if nt == 'NEG':
|
||||
self.FoldTree(child, 0)
|
||||
if child[0]['nt'] == 'CONST':
|
||||
while child[0]['nt'] == '()' and child[0]['ch'][0]['nt'] == 'NEG':
|
||||
child[0] = child[0]['ch'][0] # Remove parentheses
|
||||
if child[0]['nt'] == 'NEG':
|
||||
# Double negation: - - expr
|
||||
parent[index] = child[0]['ch'][0]
|
||||
elif child[0]['nt'] == 'CONST':
|
||||
node = parent[index] = child[0]
|
||||
node['value'] = lslfuncs.neg(node['value'])
|
||||
return
|
||||
|
||||
if nt == '!':
|
||||
self.FoldTree(child, 0)
|
||||
if child[0]['nt'] == 'CONST':
|
||||
node = parent[index] = child[0]
|
||||
# !! can *not* be simplified to !, but !!! can be simplified to !!
|
||||
subexpr = child[0]
|
||||
while subexpr['nt'] == '()' and subexpr['ch'][0]['nt'] in ('()', '~', '!', '++V', '--V'):
|
||||
subexpr = child[0] = subexpr['ch'][0] # Remove parentheses
|
||||
if subexpr['nt'] == '!' and subexpr['ch'][0]['nt'] == '!':
|
||||
# Simplify !!! to !
|
||||
subexpr = child[0] = subexpr['ch'][0]['ch'][0]
|
||||
if subexpr['nt'] == 'CONST':
|
||||
node = parent[index] = subexpr
|
||||
node['value'] = int(not node['value'])
|
||||
return
|
||||
|
||||
if nt == '~':
|
||||
self.FoldTree(child, 0)
|
||||
if child[0]['nt'] == 'CONST':
|
||||
subexpr = child[0]
|
||||
while subexpr['nt'] == '()' and subexpr['ch'][0]['nt'] in ('()', '~', '!', '++V', '--V'):
|
||||
subexpr = child[0] = subexpr['ch'][0] # Remove parentheses
|
||||
if subexpr['nt'] == '~':
|
||||
# Double negation: ~~expr
|
||||
parent[index] = subexpr['ch'][0]
|
||||
elif subexpr['nt'] == 'CONST':
|
||||
node = parent[index] = child[0]
|
||||
node['value'] = ~node['value']
|
||||
return
|
||||
|
||||
if nt == '()':
|
||||
self.FoldTree(child, 0)
|
||||
if child[0]['nt'] in ('CONST', 'VECTOR', 'ROTATION', 'LIST',
|
||||
if child[0]['nt'] in ('()', 'CONST', 'VECTOR', 'ROTATION', 'LIST',
|
||||
'IDENT', 'FIELD', 'V++', 'V--', 'FUNCTION', 'PRINT'):
|
||||
# Child is an unary postfix expression; parentheses are
|
||||
# redundant and can be removed safely. Not strictly an
|
||||
# optimization but it helps keep the output tidy-ish a bit.
|
||||
# It's not done in general (e.g. (a * b) + c does not need
|
||||
# parentheses but these are not eliminated). Only the cases
|
||||
# like (myvar) are simplified.
|
||||
# Child is an unary postfix expression (highest priority);
|
||||
# parentheses are redundant and can be removed safely. Not
|
||||
# strictly an optimization but it helps keeping the output
|
||||
# tidy-ish a bit. It's not done in general (e.g. (a * b) + c
|
||||
# does not need parentheses but these are not eliminated). Only
|
||||
# cases like (3) or (myvar++) are simplified.
|
||||
parent[index] = child[0]
|
||||
return
|
||||
|
||||
|
|
@ -137,25 +162,163 @@ class optimizer(object):
|
|||
elif nt == '&':
|
||||
result = op1 & op2
|
||||
elif nt == '||':
|
||||
result = int(op1 or op2)
|
||||
result = int(bool(op1) or bool(op2))
|
||||
elif nt == '&&':
|
||||
result = int(op1 and op2)
|
||||
result = int(bool(op1) and bool(op2))
|
||||
else:
|
||||
raise Exception(u'Internal error: Operator not found: ' + nt.decode('utf8')) # pragma: no cover
|
||||
assert False, 'Internal error: Operator not found: ' + nt # pragma: no cover
|
||||
parent[index] = {'nt':'CONST', 't':node['t'], 'value':result}
|
||||
elif nt == '-' and child[0]['t'] in ('integer', 'float') \
|
||||
and child[1]['t'] in ('integer', 'float'):
|
||||
return
|
||||
|
||||
# Simplifications for particular operands
|
||||
optype = node['t']
|
||||
lval = child[0]
|
||||
ltype = lval['t']
|
||||
lnt = lval['nt']
|
||||
rval = child[1]
|
||||
rtype = rval['t']
|
||||
rnt = rval['nt']
|
||||
if nt == '-':
|
||||
if optype in ('vector', 'rotation'):
|
||||
if lnt == 'CONST' and all(component == 0 for component in lval['value']):
|
||||
# Change <0,0,0[,0]>-expr -> -expr
|
||||
parent[index] = {'nt':'NEG', 't':node['t'], 'ch':[rval]}
|
||||
elif rnt == 'CONST' and all(component == 0 for component in rval['value']):
|
||||
# Change expr-<0,0,0[,0]> -> expr
|
||||
parent[index] = lval
|
||||
return
|
||||
|
||||
# Change - to + - for int/float
|
||||
nt = node['nt'] = '+'
|
||||
if child[1]['nt'] == 'CONST':
|
||||
if child[1]['value'] == 0:
|
||||
parent[index] = child[0]
|
||||
else:
|
||||
node['nt'] = '+'
|
||||
child[1]['value'] = lslfuncs.neg(child[1]['value'])
|
||||
#TODO: Implement to transform 0-x into -x: elif child[0]['nt'] == 'CONST':
|
||||
rval['value'] = lslfuncs.neg(rval['value'])
|
||||
else:
|
||||
node['nt'] = '+'
|
||||
child[1] = {'nt':'NEG', 't':child[1]['t'], 'ch':[child[1]]}
|
||||
rnt = 'NEG'
|
||||
rval = child[1] = {'nt':rnt, 't':rval['t'], 'ch':[rval]}
|
||||
# rtype unchanged
|
||||
|
||||
# Fall through to simplify it as '+'
|
||||
|
||||
if nt == '+':
|
||||
# Tough one. Remove neutral elements for the diverse types,
|
||||
# and more.
|
||||
if optype == 'list' and not (ltype == rtype == 'list'):
|
||||
# Nothing to do with list + nonlist or nonlist + list.
|
||||
# FIXME: Not true. (list)"string" is a 5 byte saving vs.
|
||||
# [] + "string". Activating explicitcast forces the
|
||||
# conversion [] + (list)"string" -> (list)"string" which
|
||||
# is what we want here, but it is a loss for other types.
|
||||
# Further analysis needed.
|
||||
return
|
||||
|
||||
if optype in ('vector', 'rotation'):
|
||||
# not much to do with vectors or quaternions either
|
||||
if lnt == 'CONST' and all(component == 0 for component in lval['value']):
|
||||
# Change <0,0,0[,0]>+expr -> expr
|
||||
parent[index] = rval
|
||||
elif rnt == 'CONST' and all(component == 0 for component in rval['value']):
|
||||
# Change expr+<0,0,0[,0]> -> expr
|
||||
parent[index] = lval
|
||||
return
|
||||
|
||||
# Can't be key, as no combo of addition operands returns key
|
||||
# All these types evaluate as boolean False when they are
|
||||
# the neutral addition element.
|
||||
if optype in ('string', 'float', 'list'):
|
||||
if lnt == 'CONST' and not lval['value']:
|
||||
# 0 + expr -> expr
|
||||
# "" + expr -> expr
|
||||
# [] + expr -> expr
|
||||
parent[index] = self.Cast(rval, optype)
|
||||
elif rnt == 'CONST' and not rval['value']:
|
||||
# expr + 0 -> expr
|
||||
# expr + "" -> expr
|
||||
# expr + [] -> expr
|
||||
parent[index] = self.Cast(lval, optype)
|
||||
return
|
||||
|
||||
# Must be two integers. This allows for a number of
|
||||
# optimizations. First the most obvious ones.
|
||||
|
||||
if lnt == 'CONST' and lval['value'] == 0:
|
||||
parent[index] = rval
|
||||
return
|
||||
|
||||
if rnt == 'CONST' and rval['value'] == 0:
|
||||
parent[index] = lval
|
||||
return
|
||||
|
||||
# Remove parentheses if they enclose a NEG, to unhide their
|
||||
# operators. Precedence rules allow us.
|
||||
if lnt == '()' and lval['ch'][0]['nt'] == 'NEG':
|
||||
# (-expr) + expr -> -expr + expr
|
||||
lval = child[0] = lval['ch'][0]
|
||||
if rnt == '()' and rval['ch'][0]['nt'] == 'NEG':
|
||||
# expr + (-expr) -> expr + -expr
|
||||
rval = child[1] = rval['ch'][0]
|
||||
|
||||
if lnt != 'CONST' != rnt:
|
||||
# Neither is const. Two chances to optimize.
|
||||
# 1. -expr + -expr -> -(expr + expr) (saves 1 byte)
|
||||
# 2. lvalue + -lvalue -> 0
|
||||
# There may be other possibilities for optimization,
|
||||
# e.g. (type)ident + -(type)ident but we only do lvalues
|
||||
# here. Note these are integers, no NaN involved.
|
||||
if lnt == rnt == 'NEG':
|
||||
node = {'nt':'+', 't':optype, 'ch':[lval['ch'][0], rval['ch'][0]]}
|
||||
node = {'nt':'()', 't':optype, 'ch':[node]}
|
||||
parent[index] = {'nt':'NEG', 't':optype, 'ch':[node]}
|
||||
return
|
||||
|
||||
if lnt == 'NEG':
|
||||
# Swap to treat always as expr + -expr for simplicity.
|
||||
lnt, lval, rnt, rval = rnt, rval, lnt, lval
|
||||
if lnt == 'IDENT' and rnt == 'NEG' and rval['ch'][0]['nt'] == 'IDENT' \
|
||||
and lval['name'] == rval['ch'][0]['name']:
|
||||
# Replace with 0
|
||||
parent[index] = {'nt':'CONST', 't':optype, 'value':0}
|
||||
|
||||
return
|
||||
|
||||
if rnt == 'CONST':
|
||||
# Swap the vars to deal with const in lval always
|
||||
lval, lnt, rval, rnt = rval, rnt, lval, lnt
|
||||
if lval['value'] == -1:
|
||||
if rnt == 'NEG':
|
||||
parent[index] = {'nt':'~', 't':optype, 'ch':rval['ch']}
|
||||
else:
|
||||
parent[index] = {'nt':'~', 't':optype,
|
||||
'ch':[{'nt':'NEG', 't':optype, 'ch':[rval]}]}
|
||||
return
|
||||
|
||||
if lval['value'] == -2:
|
||||
if rnt == 'NEG': # Cancel the NEG
|
||||
node = {'nt':'~', 't':optype, 'ch':rval['ch']}
|
||||
node = {'nt':'NEG', 't':optype, 'ch':[node]}
|
||||
parent[index] = {'nt':'~', 't':optype, 'ch':[node]}
|
||||
else: # Add the NEG
|
||||
node = {'nt':'NEG', 't':optype, 'ch':[rval]}
|
||||
node = {'nt':'~', 't':optype, 'ch':[node]}
|
||||
node = {'nt':'NEG', 't':optype, 'ch':[node]}
|
||||
parent[index] = {'nt':'~', 't':optype, 'ch':[node]}
|
||||
return
|
||||
|
||||
if lval['value'] == 1:
|
||||
parent[index] = {'nt':'NEG', 't':optype,
|
||||
'ch':[{'nt':'~', 't':optype, 'ch':[rval]}]}
|
||||
return
|
||||
|
||||
if lval['value'] == 2:
|
||||
node = {'nt':'NEG', 't':optype,
|
||||
'ch':[{'nt':'~', 't':optype, 'ch':[rval]}]}
|
||||
parent[index] = {'nt':'NEG', 't':optype,
|
||||
'ch':[{'nt':'~', 't':optype, 'ch':[node]}]}
|
||||
return
|
||||
|
||||
# More than 2 becomes counter-productive.
|
||||
|
||||
return
|
||||
|
||||
elif nt == '<<' and child[1]['nt'] == 'CONST':
|
||||
# Transforming << into multiply saves some bytes.
|
||||
if child[1]['value'] & 31:
|
||||
|
|
@ -199,7 +362,18 @@ class optimizer(object):
|
|||
# Assume we already were there
|
||||
if 'ch' in defn:
|
||||
val = defn['ch'][0]
|
||||
if val['nt'] != 'CONST' or ident['t'] in ('list', 'key'):
|
||||
# TODO: We need some more analysis here.
|
||||
# As is, it "optimizes"
|
||||
# list A = [3,4,5,6,7,8,9];
|
||||
# list B = A;
|
||||
# to
|
||||
# list A = [3,4,5,6,7,8,9];
|
||||
# list B = [3,4,5,6,7,8,9];
|
||||
# which is counter-productive. But if we exclude lists,
|
||||
# we can't do this:
|
||||
# list A = [3,4,5,6,7,8,9];
|
||||
# list B = llList2List(A, 2, 3);
|
||||
if val['nt'] != 'CONST' or ident['t'] == 'key':
|
||||
return
|
||||
else:
|
||||
val = {'nt':'CONST', 't':defn['t'],
|
||||
|
|
@ -213,15 +387,20 @@ class optimizer(object):
|
|||
if nt == 'FNCALL':
|
||||
for idx in xrange(len(child)-1, -1, -1):
|
||||
self.FoldTree(child, idx)
|
||||
if 'fn' in self.symtab[0][node['name']]:
|
||||
fn = self.symtab[0][node['name']]['fn']
|
||||
if 'Fn' in self.symtab[0][node['name']]:
|
||||
if all(arg['nt'] == 'CONST' for arg in child):
|
||||
# Call it
|
||||
fn = self.symtab[0][node['name']]['Fn']
|
||||
value = fn(*tuple(arg['value'] for arg in child))
|
||||
if not self.foldtabs and isinstance(value, unicode) and '\t' in value:
|
||||
warning('WARNING: Tab in function result and foldtabs option not used.')
|
||||
return
|
||||
parent[index] = {'nt':'CONST', 't':node['t'], 'value':value}
|
||||
elif node['name'] == 'llGetListLength' and child[0]['nt'] == 'IDENT':
|
||||
# Convert llGetListLength(ident) to (ident != [])
|
||||
node = {'nt':'CONST', 't':'list', 'value':[]}
|
||||
node = {'nt':'!=', 't':'list', 'ch':[child[0], node]}
|
||||
parent[index] = {'nt':'()', 't':'list', 'ch':[node]}
|
||||
return
|
||||
|
||||
if nt == 'PRINT':
|
||||
|
|
|
|||
|
|
@ -253,12 +253,15 @@ class Test03_Optimizer(UnitTestCase):
|
|||
list a;
|
||||
float f;
|
||||
vector v=<1,2,f>;<1,2,3>;<1,2,3,4>;v.x;
|
||||
v-<0,0,0>;<0,0,0>-v;v+<0,0,0>;<0,0,0>+v;
|
||||
[]+f;
|
||||
integer j = 3||4&&5|6^7&8.==9!=10.e+01f<11<=12>13.>=14<<15>>16==0&&3==
|
||||
++f-f++-(3 + llFloor(f)<<3 << 32) - 2 - 0;
|
||||
integer k = 2 + (3 * 25 - 4)/2 % 9;
|
||||
a = 3; a += !3;
|
||||
f += 4; f += -4.3;
|
||||
integer i;
|
||||
i = llGetListLength(L);
|
||||
print(3+2);
|
||||
for(i=3,i;1;){}
|
||||
i |= !i;
|
||||
|
|
@ -270,6 +273,8 @@ class Test03_Optimizer(UnitTestCase):
|
|||
if (i) if (i); else ; while (i) ; do ; while (i); for(;i;);
|
||||
do while (1); while(1); for(;1;);
|
||||
for (i=0,i;0;);for(i=0,i=0;0;);return;
|
||||
(i-i)+(i-3)+(-i+i)+(-i-i)+(i+1)+(-i+1)+(i-1)+(-i-1)+(0.0+i);
|
||||
((-i)+j);((-i)+i);i-2;-i-2;2-i;
|
||||
}}''',
|
||||
['explicitcast','extendedtypecast','extendedassignment',
|
||||
'extendedglobalexpr', 'allowmultistrings', 'allowkeyconcat']
|
||||
|
|
@ -277,22 +282,30 @@ class Test03_Optimizer(UnitTestCase):
|
|||
self.opt.optimize(p)
|
||||
self.opt.optimize(p, ())
|
||||
print self.outscript.output(p)
|
||||
p = self.parser.parse('''string s = llUnescapeURL("%09");default{timer(){float f=llSqrt(-1);}}''',
|
||||
['explicitcast','extendedtypecast','extendedassignment',
|
||||
p = self.parser.parse('''string s = llUnescapeURL("%09");default{timer(){float f=llSqrt(-1);
|
||||
integer i;-(-(0.0+i));!!(!~~(!(i)));[]+i;}}''',
|
||||
['extendedtypecast','extendedassignment',
|
||||
'extendedglobalexpr', 'allowmultistrings', 'allowkeyconcat']
|
||||
)
|
||||
self.opt.optimize(p, ['optimize','foldtabs'])
|
||||
print self.outscript.output(p)
|
||||
def test_regression(self):
|
||||
|
||||
|
||||
p = self.parser.parse('''
|
||||
integer a;
|
||||
x() { if (1) { string s = "x"; s = s + (string)a; } }
|
||||
default { timer() { } }
|
||||
''', ['extendedassignment'])
|
||||
self.opt.optimize(p)
|
||||
self.outscript.output(p)
|
||||
p = self.parser.parse('''
|
||||
key k = "blah";
|
||||
out = self.outscript.output(p)
|
||||
self.assertEqual(out, 'integer a;\nx()\n{\n {\n '
|
||||
'string s = "x";\n s = s + (string)a;\n }\n}\n'
|
||||
'default\n{\n timer()\n {\n }\n}\n'
|
||||
)
|
||||
|
||||
p = self.parser.parse(
|
||||
'''key k = "blah";
|
||||
list L = [k, "xxxx", 1.0];
|
||||
float f;
|
||||
vector v = <f, 3, 4>;
|
||||
|
|
@ -301,10 +314,20 @@ class Test03_Optimizer(UnitTestCase):
|
|||
''', ['extendedassignment'])
|
||||
self.opt.optimize(p)
|
||||
out = self.outscript.output(p)
|
||||
print out
|
||||
self.assertEqual(out, 'key k = "blah";\nlist L = [k, "xxxx", 1.];\n'
|
||||
'float f;\nvector v = <0, 3, 4>;\ndefault\n{\n timer()\n'
|
||||
' {\n }\n}\n')
|
||||
'float f;\nvector v = <0, 3, 4>;\n'
|
||||
'default\n{\n timer()\n {\n }\n}\n'
|
||||
)
|
||||
|
||||
|
||||
p = self.parser.parse('list L;float f=llList2Float(L, 0);default{timer(){}}',
|
||||
['extendedglobalexpr'])
|
||||
self.opt.optimize(p)
|
||||
out = self.outscript.output(p)
|
||||
print out
|
||||
self.assertEqual(out, 'list L;\nfloat f = 0;\n'
|
||||
'default\n{\n timer()\n {\n }\n}\n')
|
||||
|
||||
|
||||
def tearDown(self):
|
||||
del self.parser
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue