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agent (5836)

agent
  agentzh@yahoo.cn
http://agentzh.spaces.live.com/

Agent Zhang (章亦春) is a happy Yahoo! China guy who loves Perl more than anything else.

Journal of agent (5836)

Saturday November 05, 2005
12:50 AM

MASM Port for Test::More

[ #27458 ]

The upcoming CPAN module, Test::Masm::Dos, will be a MASM port for the excellent Test::More module on Perl's land. The approach is to give special meanings to MASM comments so that we can write something like

        mov ax, 0ffffh
        ; is ax, -1, "Test a negative number";

directly in the context of 16-bit MASM source code. The implementation for these smart comments is straightforward too -- expand each comment with a piece of assembly code that implements exactly what the comment says. Hence most of the amazing power the Perl QA Group owns can be brought to the poor 16-bit MASM, a legacy MS-DOS assembly language developed by Microsoft.

Here is a complete (thought still trivial) example:

        ; foo.asm
        code segment
                assume cs:code
        start:
                ; tests => 5;
                mov ax, 1011011B
                inc ax
                ; is ax, 91;
                mov cx, 5
                next:
                ; say "# cx = ", cx;
                ; ok cx

        code ends
                  end start

Then we could feed it to my masmt script:

        masmt -o ~foo.asm foo.asm

where ~foo.asm is a temporary program with all the smart comments expanded by corresponding assembly instructions. So now we can assemble this to an executable named ~foo.exe, which is a MASM tester that produces TAP report!

At this point, I've only implemented the "say" comment. However, my classmates and I have already found it very helpful, especially when debugging our assembly programs. You know, it's really a painful experience to do even simple I/O in MASM!

With smart comments in hand, we can easily realize our dreams of applying Perl's debugging strategy to MASM: tweak, run, and tweak, run!

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