48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
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"""
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Phase 132-Post: PHI Management Box
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Box-First principle: Encapsulate PHI lifecycle management
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- Track PHI ownership (which block created which PHI)
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- Protect PHIs from overwrites (SSOT principle)
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- Filter vmap to preserve PHI values
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"""
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class PhiManager:
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"""PHI value lifecycle manager (Box pattern)"""
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def __init__(self):
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self.predeclared = {} # (bid, vid) -> phi_value
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def register_phi(self, bid: int, vid: int, phi_value):
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"""Register a PHI as owned by specific block"""
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self.predeclared[(bid, vid)] = phi_value
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def is_phi_owned(self, bid: int, vid: int) -> bool:
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"""Check if PHI is owned by block"""
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return (bid, vid) in self.predeclared
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def filter_vmap_preserve_phis(self, vmap: dict, target_bid: int) -> dict:
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"""Filter vmap while preserving owned PHIs
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SSOT: PHIs in vmap are the single source of truth
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"""
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result = {}
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for vid, val in vmap.items():
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if hasattr(val, 'add_incoming'): # Is PHI?
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if self.is_phi_owned(target_bid, vid):
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result[vid] = val
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else:
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result[vid] = val
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return result
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def sync_protect_phis(self, target_vmap: dict, source_vmap: dict):
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"""Sync values but protect existing PHIs (Fail-Fast)
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Never overwrite PHIs - they are SSOT
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"""
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for vid, val in source_vmap.items():
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existing = target_vmap.get(vid)
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if existing and hasattr(existing, 'add_incoming'):
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continue # SSOT: Don't overwrite PHIs
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target_vmap[vid] = val
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