Mercurial > lcfOS
annotate python/target/instructionselector.py @ 305:0615b5308710
Updated docs
| author | Windel Bouwman |
|---|---|
| date | Fri, 06 Dec 2013 13:50:38 +0100 |
| parents | 6753763d3bec |
| children | d1ecc493384e |
| rev | line source |
|---|---|
| 301 | 1 from ppci import ir |
| 2 from ppci import irmach | |
| 3 from ppci.irmach import AbstractInstruction as makeIns | |
|
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4 import target |
| 269 | 5 |
| 6 def genTemps(): | |
| 7 n = 900 | |
| 8 while True: | |
| 275 | 9 yield ir.Temp('t{}'.format(n)) |
| 269 | 10 n = n + 1 |
| 11 | |
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12 |
| 269 | 13 class InstructionSelector: |
| 14 """ | |
| 15 Base instruction selector. This class must be overridden by | |
| 16 backends. | |
| 17 """ | |
| 275 | 18 def __init__(self): |
| 19 self.temps = genTemps() | |
| 20 | |
| 269 | 21 def newTmp(self): |
| 22 return self.temps.__next__() | |
| 23 | |
| 275 | 24 def munchFunction(self, f, frame): |
| 269 | 25 # Entry point for instruction selection |
| 275 | 26 assert isinstance(f, ir.Function) |
| 269 | 27 self.targets = {} |
| 275 | 28 # Enter a frame per function: |
| 29 self.frame = frame | |
| 30 # First define labels: | |
| 31 for bb in f.Blocks: | |
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parents:
279
diff
changeset
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32 itgt = makeIns(target.Label(bb.name)) |
| 275 | 33 self.targets[bb] = itgt |
| 34 # Generate code for all blocks: | |
| 35 for bb in f.Blocks: | |
| 36 self.emit2(self.targets[bb]) | |
| 37 for i in bb.Instructions: | |
| 38 self.munchStm(i) | |
| 39 self.munchStm(ir.Move(self.frame.rv, f.return_value)) | |
| 269 | 40 |
| 275 | 41 def move(self, dst, src): |
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parents:
279
diff
changeset
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42 raise NotImplementedError('Not target implemented') |
| 269 | 43 |
| 44 def emit(self, *args, **kwargs): | |
| 45 """ Abstract instruction emitter """ | |
| 275 | 46 i = makeIns(*args, **kwargs) |
| 269 | 47 return self.emit2(i) |
| 48 | |
| 49 def emit2(self, i): | |
| 274 | 50 self.frame.instructions.append(i) |
| 269 | 51 return i |
| 52 | |
| 53 def munchStm(self, s): | |
| 274 | 54 """ Implement this in the target specific back-end """ |
| 269 | 55 raise NotImplementedError() |
| 56 | |
| 57 def munchExpr(self, e): | |
| 274 | 58 """ Implement this in the target specific back-end """ |
| 269 | 59 raise NotImplementedError() |