SEA
Static bytecode simulator for creating dependency/dependant based experimental bytecode format for CPython.
Example
a = random()
if a >= 5.0:
print('a is too big')
a = 5.0
elif a <= 2.0:
print('a is too small')
a *= 2
for counter in range(int(a)):
if counter > 4:
print('up to 4')
break
print(counter)
print('done')
Would normally compile to this
Original dis output (click to expand)
1 0 LOAD_NAME 0 (random)
2 CALL_FUNCTION 0
4 STORE_NAME 1 (a)
3 6 LOAD_NAME 1 (a)
8 LOAD_CONST 0 (5.0)
10 COMPARE_OP 5 (>=)
12 POP_JUMP_IF_FALSE 28
4 14 LOAD_NAME 2 (print)
16 LOAD_CONST 1 ('a is too big')
18 CALL_FUNCTION 1
20 POP_TOP
5 22 LOAD_CONST 0 (5.0)
24 STORE_NAME 1 (a)
26 JUMP_FORWARD 24 (to 52)
6 >> 28 LOAD_NAME 1 (a)
30 LOAD_CONST 2 (2.0)
32 COMPARE_OP 1 (<=)
34 POP_JUMP_IF_FALSE 52
7 36 LOAD_NAME 2 (print)
38 LOAD_CONST 3 ('a is too small')
40 CALL_FUNCTION 1
42 POP_TOP
8 44 LOAD_NAME 1 (a)
46 LOAD_CONST 4 (2)
48 INPLACE_MULTIPLY
50 STORE_NAME 1 (a)
10 >> 52 LOAD_NAME 3 (range)
54 LOAD_NAME 4 (int)
56 LOAD_NAME 1 (a)
58 CALL_FUNCTION 1
60 CALL_FUNCTION 1
62 GET_ITER
>> 64 FOR_ITER 32 (to 98)
66 STORE_NAME 5 (counter)
11 68 LOAD_NAME 5 (counter)
70 LOAD_CONST 5 (4)
72 COMPARE_OP 4 (>)
74 POP_JUMP_IF_FALSE 88
12 76 LOAD_NAME 2 (print)
78 LOAD_CONST 6 ('up to 4')
80 CALL_FUNCTION 1
82 POP_TOP
13 84 POP_TOP
86 JUMP_ABSOLUTE 98
15 >> 88 LOAD_NAME 2 (print)
90 LOAD_NAME 5 (counter)
92 CALL_FUNCTION 1
94 POP_TOP
96 JUMP_ABSOLUTE 64
17 >> 98 LOAD_NAME 2 (print)
100 LOAD_CONST 7 ('done')
102 CALL_FUNCTION 1
104 POP_TOP
106 LOAD_CONST 8 (None)
108 RETURN_VALUE
However with basic SEA, it is getting compiled to this
python -m sea (click to expand)
$0 = LOAD_NAME('random')
$1 = CALL_FUNCTION(0, $0)
$2 = STORE_NAME('a', $1)
$3 = LOAD_NAME('a')
$4 = LOAD_CONST(5.0)
$5 = COMPARE_OP('>=', $3, $4)
$6 = POP_JUMP_IF_FALSE(28, $5)
$7 = LOAD_NAME('print')
$8 = LOAD_CONST('a is too big')
$9 = CALL_FUNCTION(1, $7, $8)
$10 = POP_TOP($9)
$11 = LOAD_CONST(5.0)
$12 = STORE_NAME('a', $11)
$13 = JUMP_FORWARD(52)
$14 = LOAD_NAME('a')
$15 = LOAD_CONST(2.0)
$16 = COMPARE_OP('<=', $14, $15)
$17 = POP_JUMP_IF_FALSE(52, $16)
$18 = LOAD_NAME('print')
$19 = LOAD_CONST('a is too small')
$20 = CALL_FUNCTION(1, $18, $19)
$21 = POP_TOP($20)
$22 = LOAD_NAME('a')
$23 = LOAD_CONST(2)
$24 = INPLACE_MULTIPLY($22, $23)
$25 = STORE_NAME('a', $24)
$26 = LOAD_NAME('range')
$27 = LOAD_NAME('int')
$28 = LOAD_NAME('a')
$29 = CALL_FUNCTION(1, $27, $28)
$30 = CALL_FUNCTION(1, $26, $29)
$31 = GET_ITER($30)
$32 = FOR_ITER(98)
$33 = STORE_NAME('counter', $32)
$34 = LOAD_NAME('counter')
$35 = LOAD_CONST(4)
$36 = COMPARE_OP('>', $34, $35)
$37 = POP_JUMP_IF_FALSE(88, $36)
$38 = LOAD_NAME('print')
$39 = LOAD_CONST('up to 4')
$40 = CALL_FUNCTION(1, $38, $39)
$41 = POP_TOP($40)
$42 = POP_TOP($31)
$43 = JUMP_ABSOLUTE(98)
$44 = LOAD_NAME('print')
$45 = LOAD_NAME('counter')
$46 = CALL_FUNCTION(1, $44, $45)
$47 = POP_TOP($46)
$48 = JUMP_ABSOLUTE(64)
$49 = LOAD_NAME('print')
$50 = LOAD_CONST('done')
$51 = CALL_FUNCTION(1, $49, $50)
$52 = POP_TOP($51)
$53 = LOAD_CONST(None)
$54 = RETURN_VALUE($53)
And with the IR mode, it even supports basic control flow operations accross blocks;
python -m sea --enable-ir (click to expand)
Block $B0:
$0 = LOAD_NAME('random')
$1 = CALL_FUNCTION(0, $0)
$2 = STORE_NAME('a', $1)
$3 = LOAD_NAME('a')
$4 = LOAD_CONST(5.0)
$5 = COMPARE_OP('>=', $3, $4)
$6 = POP_JUMP_IF_FALSE(28, $5)
may jump to: $B1 (on false), $B2 (on true)
Block $B1:
$7 = LOAD_NAME('a')
$8 = LOAD_CONST(2.0)
$9 = COMPARE_OP('<=', $7, $8)
$10 = POP_JUMP_IF_FALSE(52, $9)
may jump to: $B3 (on false), $B4 (on true)
Block $B2:
$11 = LOAD_NAME('print')
$12 = LOAD_CONST('a is too big')
$13 = CALL_FUNCTION(1, $11, $12)
$14 = POP_TOP($13)
$15 = LOAD_CONST(5.0)
$16 = STORE_NAME('a', $15)
$17 = JUMP_FORWARD(52)
may jump to: $B3
Block $B3:
$18 = LOAD_NAME('range')
$19 = LOAD_NAME('int')
$20 = LOAD_NAME('a')
$21 = CALL_FUNCTION(1, $19, $20)
$22 = CALL_FUNCTION(1, $18, $21)
$23 = GET_ITER($22)
$24 = FOR_ITER(98)
may jump to: $B5 (on exhaust), $B6 (on loop)
Block $B4:
$25 = LOAD_NAME('print')
$26 = LOAD_CONST('a is too small')
$27 = CALL_FUNCTION(1, $25, $26)
$28 = POP_TOP($27)
$29 = LOAD_NAME('a')
$30 = LOAD_CONST(2)
$31 = INPLACE_MULTIPLY($29, $30)
$32 = STORE_NAME('a', $31)
may jump to: $B3
Block $B5:
$33 = LOAD_NAME('print')
$34 = LOAD_CONST('done')
$35 = CALL_FUNCTION(1, $33, $34)
$36 = POP_TOP($35)
$37 = LOAD_CONST(None)
$38 = RETURN_VALUE($37)
Block $B6:
$39 = STORE_NAME('counter', $24)
$40 = LOAD_NAME('counter')
$41 = LOAD_CONST(4)
$42 = COMPARE_OP('>', $40, $41)
$43 = POP_JUMP_IF_FALSE(88, $42)
may jump to: $B7 (on false), $B8 (on true)
Block $B7:
$44 = LOAD_NAME('print')
$45 = LOAD_NAME('counter')
$46 = CALL_FUNCTION(1, $44, $45)
$47 = POP_TOP($46)
$48 = JUMP_ABSOLUTE(64)
may jump to: $B3
Block $B8:
$49 = LOAD_NAME('print')
$50 = LOAD_CONST('up to 4')
$51 = CALL_FUNCTION(1, $49, $50)
$52 = POP_TOP($51)
$53 = POP_TOP($23)
$54 = JUMP_ABSOLUTE(98)
may jump to: $B5
For visualizing this output, you can simply pass --show-graph option; 
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574 Dec 26, 2022
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2 Oct 31, 2021
52 Jan 03, 2023
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