From e9f634bca5d931bed8705e74d20596e9982a8654 Mon Sep 17 00:00:00 2001
From: janis <janis@nirgendwo.xyz>
Date: Mon, 20 Oct 2025 17:55:32 +0200
Subject: [PATCH] vec get

---
 lang/src/vec.asm | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/lang/src/vec.asm b/lang/src/vec.asm
index e9f6748..1714329 100644
--- a/lang/src/vec.asm
+++ b/lang/src/vec.asm
@@ -15,7 +15,7 @@ global vec_pop
 global vec_swap
 global vec_remove
 global vec_get
-global vec_free
+global vec_drop
 
 
 ;; Byte vector structure
@@ -56,6 +56,25 @@ vec_init:
     mov qword [r15 + 32], rdx ; drop
     ret
 
+;; rdi: pointer to Vec struct
+;; rsi: index
+;; fn vec_get(vec: *mut Vec, index: usize) -> *mut u8
+vec_get:
+    ; if (index >= vec.len) panic();
+    mov rax, [rdi + 8]    ; len
+    cmp rsi, rax
+    jge .panic
+    ; return &mut vec.data[index * vec.item_size];
+    mov rax, [rdi + 24]   ; item_size
+    imul rax, rsi         ; index * item_size
+    mov rsi, [rdi]       ; data
+    add rax, rsi         ; data + index * item_size
+    ret
+.panic:
+    call panic
+    ret
+
+
 ;; rdi: pointer to Vec struct
 ;; rsi: pointer to data to push
 ;; rdx: size of data to push