107 lines
1.8 KiB
Text
107 lines
1.8 KiB
Text
; types: char, short, int, long, *type
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; 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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; *<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 char x
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global short y ;123
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global long z
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:strlen
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function
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argument *char s
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local long len
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local char c
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len = 0
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:strlen_loop
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c = s[len]
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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 char c
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local *char 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 *char s
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local long 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 *char 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 *long x
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argument *long y
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local long v
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local *long p
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v = *x
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p = *y
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*p = v
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if v == 0 goto something
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p[1] = v + 1
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return p[2]
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:something
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return p[1]
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