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var decl/ varref codegen

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janis 2025-11-02 16:49:46 +01:00
parent 6ebc6afb2b
commit 6dff42cfa5
Signed by: janis
SSH key fingerprint: SHA256:bB1qbbqmDXZNT0KKD5c2Dfjg53JGhj7B3CFcLIzSqq8
1 changed files with 72 additions and 5 deletions
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77
lang/src/codegen.asm
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@ -8,6 +8,7 @@ extern vec_extend
extern vec_get
extern vec_push
extern vec_insert_sorted
extern vec_binary_search_by
extern vec_insert_many
extern vec_init_with
extern int_to_str2
@ -967,8 +968,9 @@ codegen_expr:
; function_ctx: [8..16]
; ctx [0..8]
sub rsp, 80
mov [rsp], rdi ; ctx
mov [rsp + 8], rsi ; &function_ctx
mov [rsp], rdi ; ctx
mov [rsp + 8], rsi ; &function_ctx
mov [rsp + 16], rdx ; expr index
mov rdi, [rdi] ; ast
mov rsi, rdx ; statement index
@ -1241,12 +1243,13 @@ codegen_expr:
lea rdx, [rsp + 64] ; scratch value
call codegen_move_dst_src
.after_unspill_rdx:
; free [scratch, rhs, lhs]
; free scratch
mov rdi, [rsp + 8] ; &function_ctx
lea rsi, [rsp + 64] ; scratch value
call codegen_free_operand
.after_unspill_rdx:
; free [rhs, lhs]
mov rdi, [rsp + 8] ; &function_ctx
lea rsi, [rsp + 48] ; right operand
call codegen_free_operand
@ -1286,9 +1289,70 @@ codegen_expr:
jmp .done
.var_decl:
; allocate place for variable
mov rdi, [rsp + 8] ; &function_ctx
mov rsi, 8 ; size_of::<u64>
call codegen_allocate_place
mov [rsp + 64], rax ; Operand
mov [rsp + 72], rdx ; Operand.value
neg rdx
mov [rsp + 24], rdx ; &(_, offset)
mov rdi, [rsp + 8] ; &function_ctx
lea rdi, [rsp + 8] ; stack_vars
lea rsi, [rsp + 16] ; &(index, offset)
mov rdx, stackvar_cmp
mov rcx, 0
call vec_insert_sorted
mov rax, [rsp + 64] ; Operand
mov rdx, [rsp + 72] ; Operand.value
jmp .done
.var_ref:
.assignment:
mov rax, [rax + 8] ; AstNode.data
mov rax, [rax] ; variable index
mov [rsp + 16], rax
mov qword [rsp + 24], 0
; lookup variable in stack_vars
mov rdi, [rsp + 8] ; &function_ctx
lea rdi, [rdi + 8] ; stack_vars
lea rsi, [rsp + 16] ; &(index, offset)
mov rdx, stackvar_cmp
mov rcx, 0
call vec_binary_search_by
cmp rdx, 1
je .panic ; variable not found
mov rdi, [rsp + 8] ; &function_ctx
lea rdi, [rdi + 8] ; stack_vars
mov rsi, rax ; index
call vec_get
mov rdx, [rax + 8] ; offset
neg rdx
mov rax, qword [rel OPERAND_RBP_OFFSET]
mov [rsp + 16], rax
mov [rsp + 24], rdx
; allocate value (?)
mov rdi, [rsp + 8] ; &function_ctx
mov rsi, 8 ; width = size_of::<* const()>
call codegen_allocate_value
mov [rsp + 32], rax ; dst
mov [rsp + 40], rdx
; lea dst, [rbp - offset]
mov rdi, [rsp] ; ctx
lea rsi, [rdi + 8] ; &ctx.text
mov rdi, [rsp + 8] ; &function_ctx
lea rdx, [rsp + 32] ; dst
lea rcx, [rsp + 16] ; src
mov r8, 'lea '
call codegen_binary_op_rm64_rm64
.place_to_value:
.assignment:
.value_to_place:
.deref:
.address_of:
@ -1875,4 +1939,7 @@ section .rdata
; Operand { kind: REGISTER, register: 0, width: 8, len: 0, padding: 0, value: 0 }
align 8
OPERAND_RAX dq 0x0000_8001, 0
align 8
OPERAND_RDX dq 0x0000_8301, 0
align 8
OPERAND_RBP_OFFSET dq 0x0000_8002, 0