From: anton@mips.complang.tuwien.ac.at   
      
   Bruce Axtens  writes:   
   >I've just become aware of QBE . Could one write   
   >a FORTH in it?   
      
   An interpreter written in QBE?  Should be possible.   
      
   Compiling Forth through QBE to machine code?  Here the problem is that   
   QBE (like some other intermediate languages) defines C-inspired   
   functions and imposes the resulting calling convention on the   
   languages compiling to it.  This is not ideal for all programming   
   languages, which is why LLVM has the option for other calling   
   conventions, but I don't see that for QBE.  So one option is to live   
   with the constraints of the given calling convention (but why compile   
   to QBE instead of C in that case?), another is to eschew functions,   
   calls, and returns, and implement everything in one function, with   
   calls implemented as push-and-jump, and returns implemented as   
   pull-and-indirect-jump.  Both are not ideal.   
      
   - anton   
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   M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html   
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