From 08bda4d37253d9c187372100a7017447735e0096 Mon Sep 17 00:00:00 2001
From: Olivier Gayot <duskcoder@gmail.com>
Date: Fri, 14 Feb 2014 01:52:14 +0100
Subject: use a structure to define a list and an element

we make use of the struc / endstruc notation of nasm.

this allows us to have change / add / remove some fields of the so said
structures without having to change the whole code.
---
 list.asm | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

(limited to 'list.asm')

diff --git a/list.asm b/list.asm
index ae3951c..c104af7 100644
--- a/list.asm
+++ b/list.asm
@@ -42,14 +42,24 @@ global list_append:function
 ;; pointed to by $rsi with the value of the current element.
 global list_apply:function
 
+struc list_t
+    .first: resq 1
+    .size:  resd 1
+endstruc
+
+struc elem_t
+    .next:  resq 1
+    .value: resq 1
+endstruc
+
 section .text
 
 list_init: ;; {{{
 
     enter 0, 0
+    mov QWORD [rdi + list_t.first], 0 ; first = NULL
+    mov DWORD [rdi + list_t.size], 0 ; size = 0
 
-    mov QWORD [rdi], 0 ; first = NULL
-    mov DWORD [rdi + 8], 0 ; size = 0
 
     leave
     ret
@@ -73,7 +83,7 @@ list_new_raw: ;; {{{
 
     enter 0, 0
 
-    mov rdi, 0xc
+    mov rdi, list_t_size
     call malloc
 
     leave
@@ -87,7 +97,7 @@ list_append: ;; {{{
     mov [rsp], rdi
     mov [rsp + 8], rsi
 
-    mov rdi, 0x10
+    mov rdi, elem_t_size
     call malloc
 
     test rax, rax
@@ -98,17 +108,17 @@ list_append: ;; {{{
     .malloc_succeed:
     ; set the new element
     mov rsi, QWORD [rsp + 8]
-    mov QWORD [rax], 0
-    mov QWORD [rax + 8], rsi
+    mov QWORD [rax + elem_t.next], 0
+    mov QWORD [rax + elem_t.value], rsi
 
     mov rdi, [rsp]
-    mov ecx, [rdi + 8]
+    mov ecx, [rdi + list_t.size]
 
     .loop:
     test ecx, ecx
     je .set_elem
     dec ecx
-    mov rdi, QWORD [rdi]
+    mov rdi, QWORD [rdi + elem_t.next]
     jmp .loop
 
     .set_elem:
@@ -117,7 +127,7 @@ list_append: ;; {{{
 
     ; increment size
     mov rdi, QWORD [rsp]
-    inc DWORD [rdi + 8]
+    inc DWORD [rdi + list_t.size]
 
     xor rax, rax
 
@@ -132,7 +142,7 @@ list_apply: ;; {{{
 
     mov QWORD [rsp], rsi
 
-    mov ecx, DWORD [rdi + 8]
+    mov ecx, DWORD [rdi + list_t.size]
 
     .loop:
     test ecx, ecx
@@ -145,7 +155,7 @@ list_apply: ;; {{{
     mov DWORD [rsp + 8], ecx
     mov QWORD [rsp + 0xc], rdi
 
-    mov rdi, QWORD [rdi + 8]
+    mov rdi, QWORD [rdi + elem_t.value]
     call QWORD [rsp]
 
     ; get back the registers
-- 
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