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    <p>You may be interested in <a href="http://en.wikipedia.org/wiki/Continuation_passing_style" rel="nofollow">continuation passing style</a>. Probably, <a href="http://gabriel.kerneis.info/software/cpc/" rel="nofollow">CPC</a> should interest you. Please notice that CPS transformation is a <em>whole program</em> transformation. Read also wikipages on <a href="http://en.wikipedia.org/wiki/Continuation" rel="nofollow">continuations</a>, <a href="http://en.wikipedia.org/wiki/Coroutine" rel="nofollow">coroutines</a>, <a href="http://en.wikipedia.org/wiki/Cooperative_multitasking" rel="nofollow">cooperative multitasking</a>, <a href="http://en.wikipedia.org/wiki/Nonpreemptive_multitasking" rel="nofollow">non-preemptive multitasking</a>, <a href="http://en.wikipedia.org/wiki/Callback_%28computer_programming%29" rel="nofollow">callbacks</a> ...</p> <p>Read Andrew <a href="http://www.ebook3000.com/-Compiling-with-Continuations--by-Andrew-W--Appel_80709.html" rel="nofollow">Appel's old book on <em>Compiling with Continuations</em></a> and the more recent paper <a href="http://research.microsoft.com/pubs/64044/compilingwithcontinuationscontinued.pdf" rel="nofollow">Compiling with Continuations, Continued</a> by A.Kennedy.</p> <p>You could use computed <a href="http://en.wikipedia.org/wiki/Goto" rel="nofollow">Goto</a>-s. In standard C99 it is not possible, but some compilers (notably <a href="http://gcc.gnu.org/" rel="nofollow">GCC</a>) provide <a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html" rel="nofollow">labels as values</a> with indirect <code>goto</code> as an extension. This enables <a href="http://en.wikipedia.org/wiki/Threaded_code" rel="nofollow">threaded code</a> (for interpreters).</p> <p>I have no idea if your compiler on PIC is giving you all that. Perhaps you should consider implementing your own whole program source to source transformer (or find a language and a compiler more suited to your needs, or develop your own PIC compiler, which is an interesting project as such. See also <a href="http://www.algo-prog.info/ocapic/web/" rel="nofollow">ocapic</a>...).</p> <p>Perhaps you should consider porting <a href="http://gabriel.kerneis.info/software/cpc/" rel="nofollow">CPC</a> to your system or compiler....</p> <h3>addenda</h3> <p>your original code </p> <pre><code> #define resume_from(x) goto point##x unsigned char status = 0; void my_func(void) { resume_from(status); </code></pre> <p>should not even compile. The last line is expanded by the <a href="http://en.wikipedia.org/wiki/C_preprocessor" rel="nofollow">C preprocessor</a> as <code>goto pointstatus;</code> and you don't have any <code>pointstatus</code> label. Try to get the preprocessed form (e.g. with <code>gcc -C -E</code> or the equivalent). You probably want a <code>switch</code> or a computed goto (if your compiler gives you that).</p>
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    1. POHow to make "goto" go to the label that is set by variable using preprocessor?
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    1. USBasile Starynkevitch
    1. USBasile Starynkevitch
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    1. CO*I have no idea if your compiler on PIC is giving you all that* — doubtful but possible. Microchip's compilers for recent chips are GCC based, but can't do everything. Compiling as `gnu99` is possible though. If it's an older PIC... probably not.
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    2. COIsn't continuation passing style inappropriate for C? I thought it depended on having lexically-scoped identifiers (closures), which C doesn't.
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    3. CO@Steve314: CPS requires a whole program transformation, see the papers on CPC ....
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      1. USBasile Starynkevitch
 

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