Mercurial > lcfOS
view python/instructionselector.py @ 288:a747a45dcd78
Various styling work
author | Windel Bouwman |
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date | Thu, 21 Nov 2013 14:26:13 +0100 |
parents | 02385f62f250 |
children |
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import ir import irmach from irmach import AbstractInstruction as makeIns import target def genTemps(): n = 900 while True: yield ir.Temp('t{}'.format(n)) n = n + 1 class InstructionSelector: """ Base instruction selector. This class must be overridden by backends. """ def __init__(self): self.temps = genTemps() def newTmp(self): return self.temps.__next__() def munchFunction(self, f, frame): # Entry point for instruction selection assert isinstance(f, ir.Function) self.targets = {} # Enter a frame per function: self.frame = frame # First define labels: for bb in f.Blocks: itgt = makeIns(target.Label(bb.name)) self.targets[bb] = itgt # Generate code for all blocks: for bb in f.Blocks: self.emit2(self.targets[bb]) for i in bb.Instructions: self.munchStm(i) self.munchStm(ir.Move(self.frame.rv, f.return_value)) def move(self, dst, src): raise NotImplementedError('Not target implemented') def emit(self, *args, **kwargs): """ Abstract instruction emitter """ i = makeIns(*args, **kwargs) return self.emit2(i) def emit2(self, i): self.frame.instructions.append(i) return i def munchStm(self, s): """ Implement this in the target specific back-end """ raise NotImplementedError() def munchExpr(self, e): """ Implement this in the target specific back-end """ raise NotImplementedError()