def convert_to_ssa(func):
# return labeled blocks
blocks = block_map(form_blocks(func['instrs']))
# add entry block if required
add_entry(blocks)
# add terminators to block if required
add_terminators(blocks)
# get the successor of each block
succ = {name: successors(block[-1]) for name, block in blocks.items()}
# get the predecessor of each block
pred = map_inv(succ)
# get dominator of each block
dom = get_dom(succ, list(blocks.keys())[0])
# get dominate frontier of each block
df = dom_fronts(dom, succ)
# varaible map to block label
defs = def_blocks(blocks)
# get function type
types = get_types(func)
# get argument name
arg_names = {a['name'] for a in func['args']} if 'args' in func else set()
# find phi nodes
phis = get_phis(blocks, df, defs)
# rename variables
phi_args, phi_dests = ssa_rename(blocks, phis, succ, dom_tree(dom),
arg_names)
# inserte phi nodes
insert_phis(blocks, phi_args, phi_dests, types)
# rebuild the updated blocks
func['instrs'] = reassemble(blocks)
def func_from_ssa(func):
blocks = block_map(form_blocks(func['instrs']))
add_entry(blocks)
add_terminators(blocks)
# Replace each phi-node.
for block in blocks.values():
# Insert copies for each phi.
for instr in block:
if instr.get('op') == 'phi':
dest = instr['dest']
type = instr['type']
for i, label in enumerate(instr['labels']):
var = instr['args'][i]
# Insert a copy in the predecessor block, before the
# terminator.
pred = blocks[label]
pred.insert(-1, {
'op': 'id',
'type': type,
'args': [var],
'dest': dest,
})
# Remove all phis.
new_block = [i for i in block if i.get('op') != 'phi']
block[:] = new_block
func['instrs'] = reassemble(blocks)
def to_ssa(json_input):
inp = json.loads(json_input)
for func in inp['functions']:
blocks = block_map(form_blocks(func['instrs']))
add_entry(blocks)
add_terminators(blocks)
blocks = insert_phi(blocks)
blocks = rename_vars(blocks)
func['instrs'] = reassemble(blocks)
return json.dumps(inp)
def func_to_ssa(func):
blocks = block_map(form_blocks(func['instrs']))
add_entry(blocks)
add_terminators(blocks)
succ = {name: successors(block[-1]) for name, block in blocks.items()}
dom = get_dom(succ, list(blocks.keys())[0])
df = dom_fronts(dom, succ)
defs = def_blocks(blocks)
types = get_types(func)
arg_names = {a['name'] for a in func['args']} if 'args' in func else set()
phis = get_phis(blocks, df, defs)
phi_args, phi_dests = ssa_rename(blocks, phis, succ, dom_tree(dom),
arg_names)
insert_phis(blocks, phi_args, phi_dests, types)
func['instrs'] = reassemble(blocks)