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Not a bug. ctor vs object. Try this: <div class="snippet-clipboa

Sometimes `Object() == Object`. about potion HOT 1 CLOSED

perl11 commented on May 18, 2024

Sometimes `Object() == Object`.

from potion.

Comments (1)

rurban commented on May 18, 2024

Not a bug. ctor vs object.

Try this:

$ bin/potion -Dt -e'Object()
Object
Object()
Object()!=Object'
-- run-time --
[ 1] self     1     ; Lobby
[ 2] loadk    0 0   ; Object
[ 3] msg      0 1   ; Object
[ 4] call     0 1   ; <Object 7ffca42d26d8>
[ 5] self     1     ; Lobby
[ 6] loadk    0 0   ; Object
[ 7] bind     0 1   ; function Object()
[ 8] loadpn   2 0   ; nil
[ 9] call     0 2   ; Object
[10] self     1     ; Lobby
[11] loadk    0 0   ; Object
[12] msg      0 1   ; Object
[13] call     0 1   ; <Object 7ffca42d2860>
[14] self     1     ; Lobby
[15] loadk    0 0   ; Object
[16] msg      0 1   ; Object
[17] call     0 1   ; <Object 7ffca42d2948>
[18] self     2     ; Lobby
[19] loadk    1 0   ; Object
[20] bind     1 2   ; function Object()
[21] loadpn   3 0   ; nil
[22] call     1 3   ; Object
[23] neq      0 1   ; <Object 7ffca42d2948>!=Object ; true
[24] return   0     ; true

With -Dvt even more.

Object() creates a new Object instance, it is the ctor ("constructor").
That's the first VTABLE path in OP_CALL in the vm, calling potion_object_new(), and then falling thru to the 2nd closure path.

Object returns the current Object.
That's running only the second CLOSURE path in OP_CALL in the vm, just calling the
closure without creating a new object.

from potion.

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