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|
;; The MIT License (MIT)
;;
;; Copyright (c) 2013-2014 Olivier Gayot
;;
;; Permission is hereby granted, free of charge, to any person obtaining a copy
;; of this software and associated documentation files (the "Software"), to deal
;; in the Software without restriction, including without limitation the rights
;; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
;; copies of the Software, and to permit persons to whom the Software is
;; furnished to do so, subject to the following conditions:
;;
;; The above copyright notice and this permission notice shall be included in
;; all copies or substantial portions of the Software.
;;
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
;; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
;; THE SOFTWARE.
extern malloc
extern free
;; initializes the list stored at address $rdi with default values
global list_init:function
;; dynamically allocate a new list and return its address via $rax. If
;; the dynamic allocation unlikely fails, $rax will contain a null pointer
global list_new_raw:function
;; same as list_new_raw, unless the list is initialized with default values
global list_new:function
;; remove every element of the list pointed to by $rip.
;; the elements are freed using free() from the libc
global list_clear:function
;; create a new element (using dynamic allocation) at the end of the list
;; stored at address $rdi. the created element will contain the value of $rsi
;; if, unlikely, the allocation fails, $rax will contain -1.
;; otherwise (on success), $rax will be set to 0
global list_append:function
;; for every element in the list stored at address $rdi, call the 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: ;; {{{
mov QWORD [rdi + list_t.first], 0 ; first = NULL
mov DWORD [rdi + list_t.size], 0 ; size = 0
ret
;; }}}
list_new: ;; {{{
call list_new_raw
test rax, rax
je .end
mov rdi, rax
call list_init
.end:
ret
;; }}}
list_new_raw: ;; {{{
enter 0, 0
mov rdi, list_t_size
call malloc
leave
ret
;; }}}
list_clear: ;; {{{
enter 0, 0
mov ecx, [rdi + list_t.size] ; load the size of the list into the counter
test ecx, ecx
je .end
mov rsi, QWORD [rdi + list_t.first]
; the list is reset to its initial state
mov DWORD [rdi + list_t.size], 0
mov QWORD [rdi + list_t.first], 0
.loop:
push QWORD [rsi + elem_t.next]
push rcx
mov rdi, rsi
call free
pop rcx
pop rsi
dec ecx
test ecx, ecx
jne .loop
.end:
leave
ret
;; }}}
list_append: ;; {{{
enter 0x18, 0
mov [rsp], rdi
mov [rsp + 8], rsi
mov rdi, elem_t_size
call malloc
test rax, rax
jne .malloc_succeed
mov rax, -1
jmp .end
.malloc_succeed:
; set the new element
mov rsi, QWORD [rsp + 8]
mov QWORD [rax + elem_t.next], 0
mov QWORD [rax + elem_t.value], rsi
mov rdi, [rsp]
mov ecx, [rdi + list_t.size]
.loop:
test ecx, ecx
je .set_elem
dec ecx
mov rdi, QWORD [rdi + elem_t.next]
jmp .loop
.set_elem:
; set the next element
mov [rdi], rax
; increment size
mov rdi, QWORD [rsp]
inc DWORD [rdi + list_t.size]
xor rax, rax
.end:
leave
ret
;; }}}
list_apply: ;; {{{
enter 0x14, 0
mov QWORD [rsp], rsi
mov ecx, DWORD [rdi + list_t.size]
.loop:
test ecx, ecx
je .end
dec ecx
; elem = list->first or elem = elem->next
mov rdi, QWORD [rdi]
; backup our registers
mov DWORD [rsp + 8], ecx
mov QWORD [rsp + 0xc], rdi
mov rdi, QWORD [rdi + elem_t.value]
call QWORD [rsp]
; get back the registers
mov ecx, DWORD [rsp + 8]
mov rdi, QWORD [rsp + 0xc]
jmp .loop
.end:
leave
ret
;; }}}
; vim:ft=nasm
|
