From: montnaro@spyder.crd.ge.com (Skip Montanaro)
Newsgroups: gnu.gcc.help
Subject: Re: Making a C to PostScript compiler with GCC
Date: 28 Jan 93 14:50:14 GMT
Reply-To: montanaro@ausable.crd.ge.com (Skip Montanaro)
Distribution: gnu
Organization: GE Corporate Research & Development, Schenectady, NY


In article <9301262119.AA29680@osnome.che.wisc.edu> epperly@osnome.che.wisc.edu (Tom Epperly) writes:

   I was wondering how difficult it would be to make a C to PostScript
   compiler with GCC.  Could this be done by writing a GCC machine
   description file for the PostScript language?  Can someone describe if
   this is feasible and how difficult it would be?

There is something already available from the Turing Institute. Here's the
announcement.

----------

  From: Arthur van Hoff <arthur@turing-institute.ac.uk>
  To: pdb-list@turing-institute.ac.uk
  Subject: PDB -- ANSI-C to PostScript compiler
  Date: Wed, 20 Jan 93 12:19:36 GMT


  Hi HyperLook and HyperNeWS Hackers,

  PdB version 2.1 (ANSI-C to PostScript compiler) is now available
  via anonymous ftp from:

	   turing.com (192.133.90.28)  pub/pdb2.1-demo.tar.Z.

  There is no more need to write PostScript! Start using PdB right now!
  PdB is an optimizing compiler to compile ANSI-C (like) code into Adobe
  compatible PostScript. The release of version 2.1 includes:

  - Binaries for Sun SPARC station and IBM RS6000.
  - Include files for Abobe PostScript level I.
  - Include files for NeWS upto version 3.1.
  - Include files for TNT upto version 3.1.
  - Support for CPS OpenWindows upto version 3.1.
  - Support NeWS classing in a C++ manner.
  - Plenty of examples of all the above functions.
  - NeWS/OpenWindows test suite.
  - PostScript reference manual.
  - UNIX manual pages.

  Below are some examples of PdB code together with the PostScript
  produced by the compiler.

  Have fun,

	  Arthur van Hoff
	  pdb@turing.com



  ################################
  Code to draw a star shape in PdB
  ################################

  #include <graphics.h>

  void starpath(int ang)
  {
	  int i;

	  newpath();
	  moveto(100,100);
	  for (i = 1 ; i <= (int)(360 / ang) ; i++) {
		  rotate(180 + ang);
		  rlineto(100,0);
	  }
	  setgray(0);
	  stroke();
  }

  ########################
  Verbatim Compiler output
  ########################

  /starpath {
    % int --
    newpath 100 100 moveto 1 360 2 index div cvi exch sub 1 add 0 max {
      dup 180 add rotate 100 0 rlineto
    } repeat
    pop 0 setgray stroke
  } def

  ###########################
  Code for bubble-sort in PdB
  ###########################

  #include <postscript.h>

  /******************************************************
   * Bubble sort (page 66)
   * From: Algorithms + Data Structures = Programs
   *       Nicklaus Wirth
   */

  void bubblesort(int *a)
  {
	  int i, j;

	  for (i = length(a)-1 ; i > 1 ; i--)
		  for (j = 0 ; j < i ; j++)
			  if (a[j] > a[j+1]) {
				  int x = a[j+1];
				  a[j+1] = a[j];
				  a[j] = x;
			  }
  }

  ########################
  Verbatim Compiler output
  ########################

  /bubblesort {
    % int * --
    dup length 1 sub -1 2 {
      0 1 3 -1 roll 1 sub {
	2 copy get 2 index 2 index 1 add get gt {
	  2 copy 1 add get 2 index 2 index 1 add 4 index 4 index get put
	  2 index 3 1 roll put
	} {pop} ifelse
      } for
    } for
    pop
  } def

----------
--
Skip (montanaro@crd.ge.com)
Newsgroups: gnu.gcc.help,comp.unix.sysv386,biz.sco.general