mirror of
https://github.com/Sei-Lisa/LSL-PyOptimizer
synced 2025-07-01 23:58:20 +00:00
319 lines
12 KiB
Python
319 lines
12 KiB
Python
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import lslfuncs
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from lslparse import S
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import math
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CONSTANT = S['CONSTANT']
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class optimizer(object):
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# explicitly exclude assignments
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binary_ops = frozenset(('+','-','*','/','%','<<','>>','<','<=','>','>=',
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'==','!=','|','^','&','||','&&'))
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def FoldAndRemoveEmptyStmts(self, lst):
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"""Utility function for elimination of useless expressions in FOR"""
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x = 0
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while x < len(lst):
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self.FoldTree(lst[x])
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self.FoldStmt(lst[x])
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# If eliminated, it must be totally removed. A ';' won't do.
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if lst[x][0] == ';':
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del lst[x]
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else:
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x += 1
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def FoldStmt(self, code):
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"""If the statement is a constant or an identifier, remove it as it does
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nothing.
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"""
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if code[0] in (CONSTANT, 'IDENT', 'FIELD'):
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code[:] = [S[';'], None]
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else:
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code[:] = code
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def FoldTree(self, code):
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"""Recursively traverse the tree to fold constants, changing it in
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place.
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Also optimizes away IF, WHILE, etc.
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"""
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while code[0] == 'EXPR':
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code[:] = code[2]
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code0 = code[0]
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if code0 == 'CAST':
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self.FoldTree(code[2])
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if code[2][0] == CONSTANT:
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# Enable key constants. We'll typecast them back on output, but
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# this enables some optimizations.
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#if code[1] != 'key': # key constants not possible
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code[:] = [CONSTANT, code[1], lslfuncs.typecast(code[2][2])]
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return
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if code0 == 'NEG':
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self.FoldTree(code[2])
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if code[2][0] == CONSTANT:
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code[:] = [CONSTANT, code[1], lslfuncs.neg(code[2][2])]
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return
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if code0 == '!':
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self.FoldTree(code[2])
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if code[2][0] == CONSTANT:
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code[:] = [CONSTANT, code[1], int(not code[2][2])]
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return
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if code0 == '~':
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self.FoldTree(code[2])
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if code[2][0] == CONSTANT:
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code[:] = [CONSTANT, code[1], ~code[2][2]]
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return
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if code0 == '()':
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self.FoldTree(code[2])
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if code[2][0] == CONSTANT:
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code[:] = code[2]
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if code0 in self.binary_ops:
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# RTL evaluation
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self.FoldTree(code[3])
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self.FoldTree(code[2])
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if code[2][0] == code[3][0] == CONSTANT:
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op = code0
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op1 = code[2][2]
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op2 = code[3][2]
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if op == '+':
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result = lslfuncs.add(op1, op2)
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elif op == '-':
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result = lslfuncs.sub(op1, op2)
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elif op == '*':
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result = lslfuncs.mul(op1, op2)
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elif op == '/':
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result = lslfuncs.div(op1, op2)
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elif op == '%':
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result = lslfuncs.mod(op1, op2)
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elif op == '<<':
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result = lslfuncs.S32(op1 << (op2 & 31))
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elif op == '>>':
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result = lslfuncs.S32(op1 >> (op2 & 31))
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elif op == '==' or op == '!=':
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result = lslfuncs.compare(op1, op2, op == '==')
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elif op in ('<', '<=', '>', '>='):
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if op in ('>', '<='):
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result = lslfuncs.less(op2, op1)
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else:
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result = lslfuncs.less(op1, op2)
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if op in ('>=', '<='):
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result = not result
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elif op == '|':
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result = op1 | op2
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elif op == '^':
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result = op1 ^ op2
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elif op == '&':
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result = op1 & op2
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elif op == '||':
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result = int(op1 or op2)
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elif op == '&&':
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result = int(op1 and op2)
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else:
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raise Exception(u'Internal error: Operator not found: ' + op.decode('utf8'))
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code[:] = [CONSTANT, code[1], result]
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elif code[0] == '-' and code[2][1] in ('integer', 'float') and code[3][1] in ('integer', 'float'):
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# Change - to + - for int/float
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if code[3][0] == CONSTANT:
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code[3][2] = lslfuncs.neg(code[3][2])
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else:
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code[:] = [S['+'], code[1], code[2], [S['NEG'], code[3][1], code[3]]]
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elif code[0] == '<<' and code[3][0] == CONSTANT:
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# Transforming << into multiply saves some bytes.
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if code[2][0] in ('+', '-', 'NEG'): # operands with priority between * and <<
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code[2] = [S['()'], code[2][1], code[2]]
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code[:] = [S['*'], code[1], code[2], 1<<(code[3][2] & 31)]
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return
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if self.globalmode:
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if code0 == 'IDENT':
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if code[1] != 'key' and self.symtab[code[3]][code[2]][2] is not None:
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code[:] = [CONSTANT, code[1], self.symtab[code[2]][2]]
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return
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if code0 == 'FUNCTION':
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for x in code[3][::-1]:
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self.FoldTree(x)
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if code[2] in self.functions and self.functions[code[2]][2] is not None:
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for x in code[3]:
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if x[0] != CONSTANT:
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break
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else:
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# Call it
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val = self.functions[code[2]][2](*tuple(x[2] for x in code[3]))
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code[:] = [CONSTANT, code[1], val]
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return
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if code0 == 'PRINT':
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# useless but who knows
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self.FoldTree(code[2])
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return
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if code0 in ('VECTOR', 'ROTATION', 'LIST'):
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for x in code[:1:-1]:
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self.FoldTree(x)
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# TODO: Fold into constant if possible.
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return
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if code0 == 'FIELD':
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if self.globalmode:
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# We can fold a vector or rotation field as they are constant.
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assert code[2][0] == 'IDENT'
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value = self.symtab[code[2][3]][code[2][2]][2]
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assert type(value) in (lslfuncs.Vector, lslfuncs.Quaternion)
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code[:] = [CONSTANT, 'float', lslfuncs.ff(value['xyzs'].index(code[3]))]
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return
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if code0 == '{}':
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for x in code[2:]:
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self.FoldTree(x)
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self.FoldStmt(x)
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return
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if code0 == 'IF':
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self.FoldTree(code[2])
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if code[2][0] == CONSTANT:
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# We can remove one of the branches safely.
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if lslfuncs.cond(code[2][2]):
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self.FoldTree(code[3])
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code[:] = code[3]
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self.FoldStmt(code)
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elif len(code) > 4:
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self.FoldTree(code[4])
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code[:] = code[4]
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self.FoldStmt(code)
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else:
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# No ELSE branch, replace the statement with an empty one.
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code[:] = [S[';'], None]
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else:
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self.FoldTree(code[3])
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self.FoldStmt(code[3])
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if len(code) > 4:
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self.FoldTree(code[4])
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self.FoldStmt(code[4])
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return
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if code0 == 'WHILE':
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self.FoldTree(code[2])
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if code[2][0] == CONSTANT:
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# See if the whole WHILE can be eliminated.
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if lslfuncs.cond(code[2][2]):
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# Endless loop which must be kept.
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# First, replace the constant.
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code[2][1:2] = [S['integer'], 1]
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# Recurse on the statement.
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self.FoldTree(code[3])
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self.FoldStmt(code[3])
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else:
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# Can be removed.
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code[:] = [S[';'], None]
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else:
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self.FoldTree(code[3])
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self.FoldStmt(code[3])
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return
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if code0 == 'DO':
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self.FoldTree(code[2]) # This one is always executed.
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self.FoldStmt(code[2])
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self.FoldTree(code[3])
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# See if the latest part is a constant.
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if code[3][0] == CONSTANT:
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if lslfuncs.cond(code[3][2]):
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# Endless loop. Replace the constant.
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code[3][1:2] = [S['integer'], 1]
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else:
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# Only one go. Replace with the statement(s).
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code[:] = code[2]
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return
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if code0 == 'FOR':
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self.FoldAndRemoveEmptyStmts(code[2])
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self.FoldTree(code[3]) # Condition.
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if code[3][0] == CONSTANT:
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# FOR is delicate. It can have multiple expressions at start.
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# And if there is more than one, these expressions will need a
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# new block, which means new scope, which is dangerous.
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# They are expressions, no declarations or labels allowed, but
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# it feels creepy.
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if lslfuncs.cond(code[3][2]):
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# Endless loop. Just replace the constant and traverse the rest.
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code[3][1:2] = [S['integer'], 1]
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self.FoldAndRemoveEmptyStmts(code[4])
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self.FoldTree(code[5])
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self.FoldStmt(code[5])
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elif len(code[2]) > 1:
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code[:] = [S['{}'], None] + code[2]
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elif code[2]:
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code[:] = code[2][0]
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else:
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code[:] = [S[';'], None]
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else:
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self.FoldAndRemoveEmptyStmts(code[4])
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self.FoldTree(code[5])
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self.FoldStmt(code[5])
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return
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if code0 == 'RETURN':
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if code[2] is not None:
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self.FoldTree(code[2])
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if code0 == 'DECL':
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# The expression code is elsewhere.
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expr = self.symtab[code[3]][code[2]][2]
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if expr is not None:
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self.FoldTree(expr)
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def Fold(self, code, IsGlobal = True):
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assert type(code[2]) == tuple
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tree = list(code[2])
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self.globalmode = IsGlobal and len(code) == 3
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self.FoldTree(tree)
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# As a special case, we fold the constants that are keys,
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# because the folder
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# TODO: Move this to a post-folding optimization.
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# Reasons: (1) it doesn't optimize deep constants and
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# (2) it disturbs normal folding if done on the fly.
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# Mono optimization: (integer)-5 and (float)-3.0 is cheaper.
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if not IsGlobal and tree[0] == 'CONSTANT':
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# Disabled because we print integer constants in hex anyway.
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#if tree[1] == 'integer' and tree[2] < 0:
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# tree[:] = [S['CAST'], 'integer', tree]
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if tree[1] == 'float' and tree[2] < 0.0 and not math.isinf(tree[2]):
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tree[:] = [S['CAST'], 'float', tree]
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if type(code) == tuple:
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code = list(code)
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code[2] = tuple(tree)
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code = tuple(code)
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else:
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assert False
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code[2] = tuple(tree)
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del self.globalmode
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def optimize(self, symtab, functions):
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"""Optimize the symbolic table symtab in place. Uses a table of
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predefined functions for folding constants.
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"""
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self.functions = functions
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self.symtab = symtab
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# Fold constants etc.
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for name in symtab[0]:
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if name == -1:
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continue
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entry = symtab[0][name]
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if entry[1] == 'State':
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for event in entry[2]:
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self.Fold(entry[2][event], False)
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elif type(entry[2]) == tuple:
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self.Fold(entry) # global
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