108 lines
1.7 KiB
Text
108 lines
1.7 KiB
Text
; declaration:
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; global <type> <name>
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; local <type> <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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; syscall <term> <term> ...
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; return <rvalue>
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; byte <number>
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; term:
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; <var>
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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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; *<var>
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; <var>[<term>]
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; rvalue:
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; `<string>`
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; <var>
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; &<var>
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; *1 <var> / *2 <var> / *4 <var> / *8 <var>
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; <var>[<term>]
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; ~<var>
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; <function>(<term>, <term>, ...)
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; syscall <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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: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 0 0 0 0
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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 0 0 0 0
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return
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:main
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function
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local hello
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hello = `Hello, world!
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`
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puts(hello)
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syscall 0x3c 0 0 0 0 0 0 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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return *2p
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:something
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return *4p
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