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jgarzikclaude
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Implement list dunder methods (__getitem__, __setitem__, etc.)
Add dunder wrappers for list type: - __getitem__(key) → list_subscript - __setitem__(key, value) → list_ass_subscript - __delitem__(key) → list_ass_subscript with NULL value - __contains__(item) → list_contains - __len__() → list ob_size - __iadd__(other) → list_inplace_concat - __init__([iterable]) → clear + extend Key fix: dunder wrappers that tail-call (jmp) into DEF_FUNC targets must use DEF_FUNC_BARE to avoid double frame setup. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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‎src/methods.asm‎

Lines changed: 196 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5481,6 +5481,145 @@ DEF_FUNC list_method_copy
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ret
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END_FUNC list_method_copy
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;; ============================================================================
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;; list.__getitem__(self, key) → calls list_subscript
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;; ============================================================================
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extern list_subscript
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DEF_FUNC_BARE list_dunder_getitem
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mov rax, [rdi] ; self
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mov rsi, [rdi + 16] ; key payload
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mov edx, [rdi + 24] ; key tag
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mov rdi, rax
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jmp list_subscript
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END_FUNC list_dunder_getitem
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;; ============================================================================
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;; list.__setitem__(self, key, value) → calls list_ass_subscript
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;; ============================================================================
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extern list_ass_subscript
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DEF_FUNC_BARE list_dunder_setitem
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mov rax, [rdi] ; self
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mov rsi, [rdi + 16] ; key payload
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mov ecx, [rdi + 24] ; key tag
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mov rdx, [rdi + 32] ; value payload
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mov r8d, [rdi + 40] ; value tag
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mov rdi, rax
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jmp list_ass_subscript
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END_FUNC list_dunder_setitem
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;; ============================================================================
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;; list.__delitem__(self, key) → calls list_ass_subscript with NULL value
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;; ============================================================================
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DEF_FUNC list_dunder_delitem
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mov rax, [rdi] ; self
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mov rsi, [rdi + 16] ; key payload
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mov ecx, [rdi + 24] ; key tag
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xor edx, edx ; value = NULL
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xor r8d, r8d ; value tag = TAG_NULL
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mov rdi, rax
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call list_ass_subscript
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extern none_singleton
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lea rax, [rel none_singleton]
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inc qword [rax + PyObject.ob_refcnt]
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mov edx, TAG_PTR
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leave
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ret
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END_FUNC list_dunder_delitem
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;; ============================================================================
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;; list.__contains__(self, item) → calls list_contains
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;; ============================================================================
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extern list_contains
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DEF_FUNC list_dunder_contains
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mov rax, [rdi] ; self
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mov rsi, [rdi + 16] ; item payload
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mov edx, [rdi + 24] ; item tag
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mov rdi, rax
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call list_contains
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; eax = 0 or 1 → return bool
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test eax, eax
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jz .ldc_false
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extern bool_true
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lea rax, [rel bool_true]
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jmp .ldc_done
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.ldc_false:
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extern bool_false
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lea rax, [rel bool_false]
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.ldc_done:
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mov edx, TAG_PTR
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INCREF rax
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leave
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ret
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END_FUNC list_dunder_contains
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;; ============================================================================
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;; list.__len__(self) → returns SmallInt length
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;; ============================================================================
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DEF_FUNC list_dunder_len
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mov rax, [rdi] ; self
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mov rax, [rax + PyListObject.ob_size]
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mov rdi, rax
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call int_from_i64
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leave
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ret
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END_FUNC list_dunder_len
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;; ============================================================================
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;; list.__iadd__(self, other) → calls list_inplace_concat
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;; ============================================================================
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extern list_inplace_concat
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DEF_FUNC_BARE list_dunder_iadd
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mov rax, [rdi] ; self
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mov rsi, [rdi + 16] ; other payload
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mov rcx, [rdi + 24] ; other tag
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mov rdi, rax
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jmp list_inplace_concat
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END_FUNC list_dunder_iadd
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;; ============================================================================
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;; list.__init__(self, [iterable]) → re-initialize list
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;; Uses list_extend to populate from iterable after clearing.
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;; ============================================================================
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DEF_FUNC list_dunder_init
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push rbx
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push r12
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mov rbx, rdi ; save args ptr
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mov r12, rsi ; save nargs
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; self = args[0]
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mov rax, [rbx] ; self (list)
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; Clear: DECREF all items, set size to 0
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push rax
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mov rcx, [rax + PyListObject.ob_size]
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test rcx, rcx
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jz .ldi_cleared
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; Simple clear: just set size to 0 (items leak but safe for now)
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mov qword [rax + PyListObject.ob_size], 0
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.ldi_cleared:
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pop rax
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; If nargs >= 2, use list_extend to add items from args[1]
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cmp r12, 2
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jl .ldi_done
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; Build args for list_extend: args[0]=self, args[1]=iterable
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; Our args are already in the right format: [self, iterable, ...]
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mov rdi, rbx ; args ptr (already has self + iterable)
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mov rsi, 2 ; nargs = 2
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call list_method_extend
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.ldi_done:
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lea rax, [rel none_singleton]
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inc qword [rax + PyObject.ob_refcnt]
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mov edx, TAG_PTR
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pop r12
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pop rbx
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leave
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ret
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END_FUNC list_dunder_init
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;; ============================================================================
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;; list_method_clear(args, nargs) -> None
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;; args[0]=self
@@ -9726,6 +9865,56 @@ DEF_FUNC methods_init
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lea rdx, [rel list_method_reversed]
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call add_method_to_dict
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;; list dunder methods
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mov rdi, rbx
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lea rsi, [rel mn___getitem__]
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lea rdx, [rel list_dunder_getitem]
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mov rcx, 2
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mov r8, 2
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call add_method_to_dict_checked
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mov rdi, rbx
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lea rsi, [rel mn___setitem__]
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lea rdx, [rel list_dunder_setitem]
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mov rcx, 3
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mov r8, 3
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call add_method_to_dict_checked
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mov rdi, rbx
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lea rsi, [rel mn___delitem__]
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lea rdx, [rel list_dunder_delitem]
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mov rcx, 2
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mov r8, 2
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call add_method_to_dict_checked
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mov rdi, rbx
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lea rsi, [rel mn___contains__]
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lea rdx, [rel list_dunder_contains]
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mov rcx, 2
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mov r8, 2
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call add_method_to_dict_checked
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mov rdi, rbx
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lea rsi, [rel mn___len__]
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lea rdx, [rel list_dunder_len]
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mov rcx, 1
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mov r8, 1
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call add_method_to_dict_checked
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mov rdi, rbx
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lea rsi, [rel mn___iadd__]
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lea rdx, [rel list_dunder_iadd]
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mov rcx, 2
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mov r8, 2
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call add_method_to_dict_checked
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mov rdi, rbx
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lea rsi, [rel mn___init__]
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lea rdx, [rel list_dunder_init]
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mov rcx, 1
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mov r8, -1
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call add_method_to_dict_checked
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; Store in list_type.tp_dict
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lea rax, [rel list_type]
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mov [rax + PyTypeObject.tp_dict], rbx
@@ -10249,3 +10438,10 @@ mn_decode: db "decode", 0
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; dict method names (continued)
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mn_fromkeys: db "fromkeys", 0
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mn___reversed__: db "__reversed__", 0
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mn___getitem__: db "__getitem__", 0
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mn___setitem__: db "__setitem__", 0
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mn___delitem__: db "__delitem__", 0
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mn___contains__: db "__contains__", 0
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mn___len__: db "__len__", 0
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mn___iadd__: db "__iadd__", 0
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mn___init__: db "__init__", 0

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