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|
:test
return -0x3874f
; declaration:
; global <type> <name>
; local <type> <name>
; :<label>
; statement:
; <declaration>
; if <term> <==/</>/>=/<=/!=> <term> goto <label> NOTE: this uses signed comparisons
; goto <label>
; <lvalue> = <rvalue>
; <lvalue> += <rvalue>
; <lvalue> -= <rvalue>
; <function>(<term>, <term>, ...)
; return <rvalue>
; string <str>
; byte <number>
; term:
; <var>
; <number>
; number:
; 'c
; 12345
; 0xabc
; lvalue:
; <var>
; *1 <var> / *2 <var> / *4 <var> / *8 <var>
; rvalue:
; <var>
; &<var>
; *1 <var> / *2 <var> / *4 <var> / *8 <var>
; ~<var>
; <function>(<term>, <term>, ...)
; <term> + <term>
; <term> - <term>
; NOTE: *, /, % are signed (imul and idiv)
; <term> * <term>
; <term> / <term>
; <term> % <term>
; <term> & <term>
; <term> | <term>
; <term> ^ <term>
; <term> < <term> (left shift)
; <term> > <term> (unsigned right shift)
main() ; hello
global x
global y ;123
global z
:syscall
function
; ...
byte 0x0f
byte 0x05
:strlen
function
argument s
local len
local c
local p
len = 0
:strlen_loop
p = s + len
c = *1 p
if c == 0 goto strlen_loop_end
len += 1
goto strlen_loop
:strlen_loop_end
return len
:putc
function
argument c
local p
p = &c
syscall(1, 1, p, 1)
return
:puts
function
argument s
local len
len = strlen(s)
syscall(1, 1, s, len)
return
:main
function
puts(str_hello_world)
syscall(0x3c, 0)
:str_hello_world
string Hello, world!
byte 10
byte 0
:f
function
argument x
argument y
local v
local p
v = *4x
p = *8y
*4p = v
if v == 0 goto something
*1p = v + 1
v = *2p
return v
:something
v = *4p
return v
|
