124 lines
1.8 KiB
Text
124 lines
1.8 KiB
Text
; declaration:
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; global <name>
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; local <name>
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; argument <name>
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; :<label>
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; statement:
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; <declaration>
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; if <term> <==/</>/>=/<=/!=> <term> goto <label> NOTE: this uses signed comparisons
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; goto <label>
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; <lvalue> = <rvalue>
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; <lvalue> += <rvalue>
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; <lvalue> -= <rvalue>
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; <function>(<term>, <term>, ...)
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; return <rvalue>
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; string <str>
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; byte <number>
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; reserve <number>
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; term:
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; <var>
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; .<label>
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; <number>
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; number:
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; 'c
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; 12345
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; 0xabc
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; lvalue:
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; <var>
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; *1<var> / *2<var> / *4<var> / *8<var>
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; rvalue:
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; <term>
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; &<var>
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; *1<var> / *2<var> / *4<var> / *8<var>
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; ~<term>
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; <function>(<term>, <term>, ...)
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; <term> + <term>
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; <term> - <term>
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; NOTE: *, /, % are signed (imul and idiv)
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; <term> * <term>
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; <term> / <term>
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; <term> % <term>
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; <term> & <term>
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; <term> | <term>
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; <term> ^ <term>
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; <term> < <term> (left shift)
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; <term> > <term> (unsigned right shift)
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main() ; hello
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global x
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global y ;123
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global z
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:test
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function
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local eee
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local fff
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local ggg
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return *2fff
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:test2
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function
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return -123
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:syscall
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function
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; ...
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byte 0x0f
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byte 0x05
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:strlen
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function
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argument s
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local len
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local c
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local p
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len = 0
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:strlen_loop
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p = s + len
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c = *1 p
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if c == 0 goto strlen_loop_end
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len += 1
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goto strlen_loop
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:strlen_loop_end
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return len
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:putc
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function
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argument c
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local p
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p = &c
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syscall(1, 1, p, 1)
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return
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:puts
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function
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argument s
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local len
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len = strlen(s)
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syscall(1, 1, s, len)
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return
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:main
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function
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puts(str_hello_world)
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syscall(0x3c, 0)
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:str_hello_world
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string Hello, world!
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byte 10
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byte 0
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:f
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function
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argument x
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argument y
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local v
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local p
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v = *4x
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p = *8y
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*4p = v
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if v == 0 goto something
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*1p = v + 1
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v = *2p
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return v
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:something
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v = *4p
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return v
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