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[MemorySSA] Tighten up API type signatures. NFC.

Authored by bryant on Oct 30 2016, 2:34 AM.



From what I understand, MSSA nodes are either MemoryPhis (which must only be associated with BasicBlocks), or MemoryUseOrDef (which must only be associated Instructions). Assuming that this invariant would not change in the future (which could easily not be the case if, for instance, there is desire for additional MSSA node types):

  1. getMemoryAccess could only ever return meaningful values when give a BasicBlock or Instruction,
  2. createMemoryAccessBefore/After could only ever return nodes for Instructions,
  3. Insertion of a new MemoryUseOrDef could only occur before another MemoryUseOrDef, since MemoryPhis must always come first in a BB's AccessList.

These type changes also have the pleasant side effect of reducing pointer casting verbiage.

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bryant updated this revision to Diff 76329.Oct 30 2016, 2:34 AM
bryant retitled this revision from to [MemorySSA] Tighten up API type signatures..
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bryant retitled this revision from [MemorySSA] Tighten up API type signatures. to [MemorySSA] Tighten up API type signatures. NFC..Oct 30 2016, 3:08 AM
dberlin accepted this revision.Oct 31 2016, 7:15 AM
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This revision is now accepted and ready to land.Oct 31 2016, 7:15 AM
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