def find_region_inout_vars(blocks, livemap, callfrom, returnto,
body_block_ids):
"""Find input and output variables to a block region.
"""
inputs = livemap[callfrom]
outputs = livemap[returnto]
# ensure live variables are actually used in the blocks, else remove,
# saves having to create something valid to run through postproc
# to achieve similar
loopblocks = {}
for k in body_block_ids:
loopblocks[k] = blocks[k]
used_vars = set()
def_vars = set()
defs = compute_use_defs(loopblocks)
for vs in defs.usemap.values():
used_vars |= vs
for vs in defs.defmap.values():
def_vars |= vs
used_or_defined = used_vars | def_vars
# note: sorted for stable ordering
inputs = sorted(set(inputs) & used_or_defined)
outputs = sorted(set(outputs) & used_or_defined & def_vars)
return inputs, outputs
def usedefs(self):
return analysis.compute_use_defs(self._blocks)