Code Generation

Code generation can be broken into several steps:

1. Generate the prologue

2. Generate the program code

3. Generate the epilogue

Subroutines are provided to generate the prologue and epilogue.

The arguments to the code generator are:

gencode(pcode, varsize, maxlabel)

   pcode    = pointer to code:
              (program foo (progn output)
                           (progn ...))
   varsize  = size of local storage in bytes
   maxlabel = max label number used so far

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