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Rather than generating random identifiers for locals, prefix them with 'loc_'.

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Should help improving readability of the optimized script.
This commit is contained in:
Sei Lisa 2015-03-07 14:51:51 +01:00
parent a292846d28
commit 1e8b77bf50
1 changed files with 9 additions and 19 deletions
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28
lslopt/lslrenamer.py
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@ -25,9 +25,6 @@
# TODO: Rename locals to loc_<identifier> rather than random names. # TODO: Rename locals to loc_<identifier> rather than random names.
import random
from base64 import b64encode
class renamer(object): class renamer(object):
CharSet1 = '_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' CharSet1 = '_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
CharSet2 = '0123456789_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' CharSet2 = '0123456789_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
@ -67,8 +64,6 @@ class renamer(object):
# Names from ReusableNames that have already been used # Names from ReusableNames that have already been used
self.UsedNames = set() self.UsedNames = set()
UsedLocals = set()
# Make a first pass to separate the symbols into three categories. # Make a first pass to separate the symbols into three categories.
globalvars = [] globalvars = []
states = [] states = []
@ -97,7 +92,7 @@ class renamer(object):
# the event name, e.g. edefaultstate_entry. Since a new identifier # the event name, e.g. edefaultstate_entry. Since a new identifier
# having part of the state name is created for every event in that # having part of the state name is created for every event in that
# state, the shortest the state name, the least bytes it will use. # state, the shortest the state name, the least bytes it will use.
# Furthermore, a state switch instruction further adds an Unicode # Furthermore, a state switch instruction further adds a Unicode
# string (all other identifier names use one-byte strings), which # string (all other identifier names use one-byte strings), which
# is the more reason to shorten it as much as possible. # is the more reason to shorten it as much as possible.
# #
@ -117,7 +112,7 @@ class renamer(object):
del states del states
for name in functions: for name in functions:
# Assign a new name. Internal function names get a 'g' prepended # Assign a new name. Internally, function names get a 'g' prepended
# to them, so these are candidates for reuse too. # to them, so these are candidates for reuse too.
# Unfortunately, we won't find any reusable name starting with 'g' # Unfortunately, we won't find any reusable name starting with 'g'
@ -150,7 +145,7 @@ class renamer(object):
if name == -1: continue if name == -1: continue
if sym['Kind'] != 'v': if sym['Kind'] != 'v':
assert sym['Kind'] == 'l' assert sym['Kind'] == 'l'
name = name # trick the optimizer name = name # trick python to not optimize out the jump
continue continue
if 'Param' in sym: if 'Param' in sym:
if not InParams: if not InParams:
@ -168,17 +163,12 @@ class renamer(object):
short = self.GetNextShortest() short = self.GetNextShortest()
table[name]['NewName'] = short table[name]['NewName'] = short
else: else:
# Generate new identifier # Generate new identifier, by prepending the four character
while True: # string 'loc_'. This generates identifiers with five chars
x = random.randint(0, 16777215) # or more. We assume that is enough for them to stay safe
unique = 'L_' + b64encode(chr(x>>16) + chr((x>>8)&255) # from name collisions with globals and parameter names.
+ chr(x&255)).replace('+', '_') # Four letters allow for more than 1.4 million identifiers.
x = random.randint(0, 16777215) unique = 'loc_' + name
unique += b64encode(chr(x>>16) + chr((x>>8)&255)
+ chr(x&255)).replace('+', '_')
if '/' not in unique not in UsedLocals:
break
UsedLocals.add(unique)
table[name]['NewName'] = unique table[name]['NewName'] = unique
del globalvars del globalvars