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gh-87092: refactor assemble() to a number of separate functions, which do not need the compiler struct #102562

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merged 10 commits into from
Mar 13, 2023
Merged

gh-87092: refactor assemble() to a number of separate functions, which do not need the compiler struct #102562

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8b71935
remove compiler as arg from some codegen functions
iritkatriel Mar 8, 2023
ed9c7d2
prepare_localsplus doesn't need the whole compiler struct
iritkatriel Mar 8, 2023
1232d41
don't pass compiler around so much in assembler stage
iritkatriel Mar 8, 2023
dbf22d1
extract optimize_code_unit() out of assemble()
iritkatriel Mar 9, 2023
db4b2b8
_PyCompile_CodeGen doesn't need to construct a cfg
iritkatriel Mar 9, 2023
9071570
refactor optimize_code_unit further
iritkatriel Mar 9, 2023
4e7857f
unit tests run all of the optimization stage, not just optimize_cfg
iritkatriel Mar 9, 2023
d0166c4
break up assemble() some more
iritkatriel Mar 10, 2023
c9fc294
remove obsolete comment
iritkatriel Mar 10, 2023
0f198b6
tidy up the no-arg representation in unit test instruction sequences
iritkatriel Mar 10, 2023
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2 changes: 1 addition & 1 deletion Lib/test/support/bytecode_helper.py
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ def normalize_insts(self, insts):
if isinstance(oparg, self.Label):
arg = oparg.value
else:
arg = oparg if opcode in self.HAS_ARG else None
arg = oparg if opcode in self.HAS_ARG else 0
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Why? And why do some of the 'NOP's below in test_peepholer.py have a None operand and some have 0?

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Yeah, that was just messy. I've tidied it up now. Thanks.

opcode = dis.opname[opcode]
res.append((opcode, arg, *loc))
return res
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39 changes: 26 additions & 13 deletions Lib/test/test_peepholer.py
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Expand Up @@ -995,15 +995,20 @@ def test_conditional_jump_forward_non_const_condition(self):
('LOAD_CONST', 2, 13),
lbl,
('LOAD_CONST', 3, 14),
('RETURN_VALUE', 14),
]
expected = [
expected_insts = [
('LOAD_NAME', 1, 11),
('POP_JUMP_IF_TRUE', lbl := self.Label(), 12),
('LOAD_CONST', 2, 13),
('LOAD_CONST', 1, 13),
lbl,
('LOAD_CONST', 3, 14)
('NOP', 0, 14),
('RETURN_CONST', 2, 0),
]
self.cfg_optimization_test(insts, expected, consts=list(range(5)))
self.cfg_optimization_test(insts,
expected_insts,
consts=[0, 1, 2, 3, 4],
expected_consts=[0, 2, 3])

def test_conditional_jump_forward_const_condition(self):
# The unreachable branch of the jump is removed, the jump
Expand All @@ -1015,43 +1020,51 @@ def test_conditional_jump_forward_const_condition(self):
('LOAD_CONST', 2, 13),
lbl,
('LOAD_CONST', 3, 14),
('RETURN_VALUE', 14),
]
expected = [
expected_insts = [
('NOP', None, 11),
('NOP', None, 12),
('LOAD_CONST', 3, 14)
('NOP', 0, 14),
('RETURN_CONST', 1, 0),
]
self.cfg_optimization_test(insts, expected, consts=list(range(5)))
self.cfg_optimization_test(insts,
expected_insts,
consts=[0, 1, 2, 3, 4],
expected_consts=[0, 3])

def test_conditional_jump_backward_non_const_condition(self):
insts = [
lbl1 := self.Label(),
('LOAD_NAME', 1, 11),
('POP_JUMP_IF_TRUE', lbl1, 12),
('LOAD_CONST', 2, 13),
('LOAD_NAME', 2, 13),
('RETURN_VALUE', 13),
]
expected = [
lbl := self.Label(),
('LOAD_NAME', 1, 11),
('POP_JUMP_IF_TRUE', lbl, 12),
('LOAD_CONST', 2, 13)
('LOAD_NAME', 2, 13),
('RETURN_VALUE', 13),
]
self.cfg_optimization_test(insts, expected, consts=list(range(5)))

def test_conditional_jump_backward_const_condition(self):
# The unreachable branch of the jump is removed
insts = [
lbl1 := self.Label(),
('LOAD_CONST', 1, 11),
('LOAD_CONST', 3, 11),
('POP_JUMP_IF_TRUE', lbl1, 12),
('LOAD_CONST', 2, 13),
('RETURN_VALUE', 13),
]
expected = [
expected_insts = [
lbl := self.Label(),
('NOP', None, 11),
('JUMP', lbl, 12)
('JUMP', lbl, 12),
]
self.cfg_optimization_test(insts, expected, consts=list(range(5)))
self.cfg_optimization_test(insts, expected_insts, consts=list(range(5)))


if __name__ == "__main__":
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