XPost: alt.folklore.computers   
   From: cross@spitfire.i.gajendra.net   
      
   In article <84c7R.819121$PGrb.160843@fx10.iad>,   
   Scott Lurndal  wrote:   
   >cross@spitfire.i.gajendra.net (Dan Cross) writes:   
   >>In article <10jjc9s$3uhtk$1@dont-email.me>,   
   >>Chris Ahlstrom   wrote:   
   >>>Waldek Hebisch wrote this post by blinking in Morse code:   
   >>>   
   >>>> In alt.folklore.computers c186282  wrote:   
   >>>>    
   >>>>>   Hmm ... look at all the GNU 'compilers' -   
   >>>>>   FORTRAN, COBOL, Ada, 'D', M2, Rust,C++,   
   >>>>>   G++, even Algol-68. None are 'compilers'   
   >>>>>   per-se, but to-'C' TRANSLATORS. So, 'C',   
   >>>>>   pretty much All Are One And One Is All.   
   >>>>   
   >>>> No.  Compiler as first stage translate given language to a   
   >>>> common representation.  This representatiton is different   
   >>>> than C.  Ada and GNU Pascal have parametrized types, there   
   >>>> is nothing like that in C.   
   >>>>   
   >>>>    
   >>>>   
   >>>> C++ (and some other languages)   
   >>>> have exceptions, C do not have them.   
   >>>   
   >>>What about setjmp()/longjmp() ?   
   >>   
   >>Not at all the same thing.  `setjmp`/`longjmp` are about   
   >>non-local flows of control; exceptions are about non-local   
   >>passing of values.   
   >   
   >However, in many real world situations, [sig]setjump and   
   >[sig]longjmp can be used to emulate exceptions.   
      
   Yes, I said just that.  :-)   
      
   >I have a C++ application that models a computer (Burroughs V380   
   >et alia).   The thread that models each processor (cpu) uses   
   >longjmp whenever a condition is encountered that would have   
   >been signaled as a fault on the real cpu.    The processor code   
   >doesn't do dynamic memory allocation;  and the fault code is   
   >stored in the processor class before the longjmp call.   
   >   
   >I once tried replacing setjmp/longjmp with C++ exceptions which   
   >led to a 20% reduction in simulated CPU performance (as measured   
   >by the time to compile a COBOL program).   
      
   Huh.  Interesting.  I wonder why...possibly to run a bunch of   
   nop destructors?   
      
   	- Dan C.   
      
   --- SoupGate-Win32 v1.05   
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