Mercurial > lcfOS
annotate python/ppci/codegen/flowgraph.py @ 313:04cf4d26a3bc
Added constant function
| author | Windel Bouwman |
|---|---|
| date | Wed, 18 Dec 2013 18:02:26 +0100 |
| parents | 6753763d3bec |
| children | b00219172a42 |
| rev | line source |
|---|---|
| 296 | 1 from .graph import DiGraph, DiNode |
| 269 | 2 |
| 3 | |
| 296 | 4 class FlowGraphNode(DiNode): |
| 269 | 5 """ A node in the flow graph """ |
| 6 def __init__(self, g, ins): | |
| 7 super().__init__(g) | |
| 8 self.ins = ins | |
| 9 self.uses = set(ins.src) | |
| 10 self.defs = set(ins.dst) | |
| 11 self.live_in = set() | |
| 12 self.live_out = set() | |
| 13 | |
| 14 def __repr__(self): | |
| 274 | 15 r = '{}'.format(self.ins) |
| 16 if self.uses: | |
| 17 r += ' uses:' + ', '.join(str(u) for u in self.uses) | |
| 18 if self.defs: | |
| 19 r += ' defs:' + ', '.join(str(d) for d in self.defs) | |
| 20 return r | |
| 269 | 21 |
| 22 | |
| 296 | 23 class FlowGraph(DiGraph): |
| 269 | 24 def __init__(self, instrs): |
| 25 """ Create a flowgraph from a list of abstract instructions """ | |
|
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First implementation of regalloc with coalsesc
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parents:
277
diff
changeset
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26 super().__init__() |
| 269 | 27 self._map = {} |
| 28 # Add nodes: | |
| 29 for ins in instrs: | |
|
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9fca39eebe50
First implementation of regalloc with coalsesc
Windel Bouwman
parents:
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diff
changeset
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30 n = FlowGraphNode(self, ins) |
|
9fca39eebe50
First implementation of regalloc with coalsesc
Windel Bouwman
parents:
277
diff
changeset
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31 self._map[ins] = n |
|
9fca39eebe50
First implementation of regalloc with coalsesc
Windel Bouwman
parents:
277
diff
changeset
|
32 self.addNode(n) |
| 269 | 33 |
| 34 # Make edges: | |
| 35 prev = None | |
| 36 for ins in instrs: | |
| 37 n = self._map[ins] | |
| 38 if prev: | |
| 39 self.addEdge(prev, n) | |
| 40 if ins.jumps: | |
| 41 prev = None | |
| 42 for j in ins.jumps: | |
| 43 to_n = self._map[j] | |
| 44 self.addEdge(n, to_n) | |
| 45 else: | |
| 46 prev = n |