path: root/README

This directory contains the distribution of scm5d2.  Scm conforms to
Revised^5 Report on the Algorithmic Language Scheme and the IEEE P1178
specification. SCM runs under Amiga, Atari-ST, MacOS, MS-DOS, OS/2,
NOS/VE, Unicos, VMS, Unix and similar systems.

             `http://swissnet.ai.mit.edu/~jaffer/SCM.html'

Manifest
========

`.gdbinit'       provides commands for debugging SCM with GDB             
`COPYING'        details the LACK OF WARRANTY for SCM and the conditions  
                 for distributing SCM.                                    
`ChangeLog'      changes to SCM.                                          
`Iedline.scm'    Gnu readline input editing.                              
`Init.scm'       Scheme initialization.                                   
`Link.scm'       compiles and dynamically links.                          
`Macro.scm'      Supports Syntax-Rules Macros.                            
`Makefile'       builds SCMLIT using the `make' program.                  
`QUICKREF'       Quick Reference card for R4RS and IEEE Scheme.           
`README'         contains a MANIFEST, INSTALLATION INSTRUCTIONS, hints    
                 for EDITING SCHEME CODE, and a TROUBLE SHOOTING GUIDE.   
`Transcen.scm'   inexact builtin procedures.                              
`bench.scm'      computes and records performance statistics of pi.scm.   
`build.bat'      invokes build.scm for MS-DOS                             
`build.scm'      database for compiling and linking new SCM programs.     
`continue.c'     continuations.                                           
`continue.h'     continuations.                                           
`crs.c'          interactive terminal control.                            
`dynl.c'         dynamically load object files.                           
`ecrt0.c'        discover the start of initialized data space             
                 dynamically at runtime.                                  
`edline.c'       Gnu readline input editing (get                          
                 ftp.sys.toronto.edu:/pub/rc/editline.shar).              
`eval.c'         evaluator, apply, map, and foreach.                      
`example.scm'    example from R4RS which uses inexact numbers.            
`findexec.c'     find the executable file function.                       
`gmalloc.c'      Gnu malloc(); used for unexec.                           
`gsubr.c'        make_gsubr for arbitrary (< 11) arguments to C           
                 functions.                                               
`ioext.c'        system calls in common between PC compilers and unix.    
`mkimpcat.scm'   build SCM-specific catalog for SLIB.                     
`patchlvl.h'     patchlevel of this release.                              
`pi.c'           computes digits of pi [cc -o pi pi.c;time pi 100 5].     
`pi.scm'         computes digits of pi [type (pi 100 5)].  Test           
                 performance against pi.c.                                
`posix.c'        posix library interface.                                 
`pre-crt0.c'     loaded before crt0.o on machines which do not remap      
                 part of the data space into text space in unexec.        
`r4rstest.scm'   tests conformance with Scheme specifications.            
`ramap.c'        array mapping                                            
`record.c'       proposed `Record' user definable datatypes.              
`repl.c'         error, read-eval-print loop, read, write and load.       
`rgx.c'          string regular expression match.                         
`rope.c'         C interface functions.                                   
`sc2.c'          procedures from R2RS and R3RS not in R4RS.               
`scl.c'          inexact arithmetic                                       
`scm.1'          unix style man page.                                     
`scm.c'          initialization, interrupts, and non-IEEE utility         
                 functions.                                               
`scm.doc'        man page generated from scm.1.                           
`scm.h'          data type and external definitions of SCM.               
`scm.texi'       SCM installation and use.                                
`scmfig.h'       contains system dependent definitions.                   
`scmmain.c'      initialization, interrupts, and non-IEEE utility         
                 functions.                                               
`script.c'       utilities for running as `#!' script.                    
`setjump.h'      continuations, stacks, and memory allocation.            
`setjump.mar'    provides setjump and longjump which do not use $unwind   
                 utility on VMS.                                          
`setjump.s'      provides setjump and longjump for the Cray YMP.          
`socket.c'       BSD socket interface.                                    
`split.scm'      example use of crs.c.  Input, output, and diagnostic     
                 output directed to separate windows.                     
`subr.c'         the rest of IEEE functions.                              
`sys.c'          call-with-current-continuation, opening and closing      
                 files, storage allocation and garbage collection.        
`time.c'         functions dealing with time.                             
`ugsetjump.s'    provides setjump and longjump which work on Ultrix VAX.  
`unexalpha.c'    Convert a running program into an Alpha executable file. 
`unexec.c'       Convert a running program into an executable file.       
`unexelf.c'      Convert a running ELF program into an executable file.   
`unexhp9k800.c'  Convert a running HP-UX program into an executable file. 
`unexsgi.c'      Convert a running program into an IRIX executable file.  
`unexsunos4.c'   Convert a running program into an executable file.       
`unif.c'         uniform vectors.                                         
`unix.c'         non-posix system calls on unix systems.                  


File: scm.info,  Node: SLIB,  Next: Building SCM,  Prev: Making SCM,  Up: Installing SCM

SLIB
====

[SLIB] is a portable Scheme library meant to provide compatibility and
utility functions for all standard Scheme implementations.  Although
SLIB is not *neccessary* to run SCM, I strongly suggest you obtain and
install it.  Bug reports about running SCM without SLIB have very low
priority.  SLIB is available from the same sites as SCM:

   * swissnet.ai.mit.edu:/pub/scm/slib2c7.tar.gz

   * ftp.gnu.org:/pub/gnu/jacal/slib2c7.tar.gz

   * ftp.cs.indiana.edu:/pub/scheme-repository/imp/slib2c7.tar.gz

Unpack SLIB (`tar xzf slib2c7.tar.gz' or `unzip -ao slib2c7.zip') in an
appropriate directory for your system; both `tar' and `unzip' will
create the directory `slib'.

Then create a file `require.scm' in the SCM "implementation-vicinity"
(this is the same directory as where the file `Init5d2.scm' is
installed).  `require.scm' should have the contents:

     (define (library-vicinity) "/usr/local/lib/slib/")
     (load (in-vicinity (library-vicinity) "require"))

where the pathname string `/usr/local/lib/slib/' is to be replaced by
the pathname into which you installed SLIB.  Absolute pathnames are
recommended here; if you use a relative pathname, SLIB can get confused
when the working directory is changed (*note chmod: I/O-Extensions.).
The way to specify a relative pathname is to append it to the
implementation-vicinity, which is absolute:

     (define library-vicinity
       (let ((lv (string-append (implementation-vicinity) "../slib/")))
         (lambda () lv)))
     (load (in-vicinity (library-vicinity) "require"))

Alternatively, you can set the (shell) environment variable
`SCHEME_LIBRARY_PATH' to the pathname of the SLIB directory (*note
SCHEME_LIBRARY_PATH: SCM Variables.).  If set, the environment variable
overrides `require.scm'.  Again, absolute pathnames are recommended.



File: scm.info,  Node: Making SCM,  Next: SLIB,  Prev: Installing SCM,  Up: Installing SCM

Making SCM
==========

The SCM distribution has "Makefile" which contains rules for making
"scmlit", a "bare-bones" version of SCM sufficient for running
`build.scm'.  `build.scm' is used to compile (or create scripts to
compile) full featured versions.

Makefiles are not portable to the majority of platforms.  If `Makefile'
works for you, good; If not, I don't want to hear about it.  If you
need to compile SCM without build.scm, there are several ways to
proceed:

   * Use SCM on a different platform to run `build.scm' to create a
     script to build SCM;

   * Use another implementation of Scheme to run `build.scm' to create a
     script to build SCM;

   * Create your own script or `Makefile'.

   * Buy a SCM executable from jaffer @ ai.mit.edu.  See the end of the
     `ANNOUNCE' file in the distribution for details.

   * Use scmconfig (From: bos@scrg.cs.tcd.ie):

     Build and install scripts using GNU "autoconf" are available from
     `scmconfig4e3.tar.gz' in the distribution directories.  See
     `README.unix' in `scmconfig4e3.tar.gz' for further instructions.

     *Note:* The last release of scmconfig (4e3) was on March 20, 1996.
     I am moving it to the OLD subdirectory until someone submits an
     update.



File: scm.info,  Node: Editing Scheme Code,  Next: Debugging Scheme Code,  Prev: SCM Session,  Up: Operational Features

Editing Scheme Code
===================

 - Function: ed ARG1 ...
     The value of the environment variable `EDITOR' (or just `ed' if it
     isn't defined) is invoked as a command with arguments ARG1 ....

 - Function: ed FILENAME
     If SCM is compiled under VMS `ed' will invoke the editor with a
     single the single argument FILENAME.

Gnu Emacs:
     Editing of Scheme code is supported by emacs.  Buffers holding
     files ending in .scm are automatically put into scheme-mode.
     EMACS for MS-DOS and MS-Windows systems is available (free) from:

              `http://simtel.coast.net/SimTel/gnu/demacs.html'

     If your Emacs can run a process in a buffer you can use the Emacs
command `M-x run-scheme' with SCM.  Otherwise, use the emacs command
`M-x suspend-emacs'; or see "other systems" below.

Epsilon (MS-DOS):
     There is lisp (and scheme) mode available by use of the package
     `LISP.E'.  It offers several different indentation formats.  With
     this package, buffers holding files ending in `.L', `.LSP', `.S',
     and `.SCM' (my modification) are automatically put into lisp-mode.

     It is possible to run a process in a buffer under Epsilon.  With
     Epsilon 5.0 the command line options `-e512 -m0' are neccessary to
     manage RAM properly.  It has been reported that when compiling SCM
     with Turbo C, you need to `#define NOSETBUF' for proper operation
     in a process buffer with Epsilon 5.0.

     One can also call out to an editor from SCM if RAM is at a
     premium; See "under other systems" below.

other systems:
     Define the environment variable `EDITOR' to be the name of the
     editing program you use.  The SCM procedure `(ed arg1 ...)'  will
     invoke your editor and return to SCM when you exit the editor.  The
     following definition is convenient:

          (define (e) (ed "work.scm") (load "work.scm"))

     Typing `(e)' will invoke the editor with the file of interest.
     After editing, the modified file will be loaded.



File: scm.info,  Node: Problems Compiling,  Next: Problems Linking,  Prev: Automatic C Preprocessor Definitions,  Up: Installing SCM

Problems Compiling
==================

FILE    PROBLEM / MESSAGE                HOW TO FIX                       
*.c     include file not found.          Correct the status of            
                                         STDC_HEADERS in scmfig.h.        
                                         fix #include statement or add    
                                         #define for system type to       
                                         scmfig.h.                        
*.c     Function should return a value.  Ignore.                          
        Parameter is never used.                                          
        Condition is always false.                                        
        Unreachable code in function.                                     
scm.c   assignment between incompatible  Change SIGRETTYPE in scm.c.      
        types.                                                            
time.c  CLK_TCK redefined.               incompatablility between         
                                         <stdlib.h> and <sys/types.h>.    
                                         Remove STDC_HEADERS in scmfig.h. 
                                         Edit <sys/types.h> to remove     
                                         incompatability.                 
subr.c  Possibly incorrect assignment    Ignore.                          
        in function lgcd.                                                 
sys.c   statement not reached.           Ignore.                          
        constant in conditional                                           
        expression.                                                       
sys.c   undeclared, outside of           #undef STDC_HEADERS in scmfig.h. 
        functions.                                                        
scl.c   syntax error.                    #define SYSTNAME to your system  
                                         type in scl.c (softtype).        



File: scm.info,  Node: Problems Linking,  Next: Problems Running,  Prev: Problems Compiling,  Up: Installing SCM

Problems Linking
================

PROBLEM                              HOW TO FIX                           
_sin etc. missing.                   Uncomment LIBS in makefile.          



File: scm.info,  Node: Problems Running,  Next: Testing,  Prev: Problems Linking,  Up: Installing SCM

Problems Running
================

PROBLEM                              HOW TO FIX                           
Opening message and then machine     Change memory model option to C      
crashes.                             compiler (or makefile).              
                                     Make sure sizet definition is        
                                     correct in scmfig.h.                 
                                     Reduce the size of HEAP_SEG_SIZE in  
                                     setjump.h.                           
Input hangs.                         #define NOSETBUF                     
ERROR: heap: need larger initial.    Increase initial heap allocation     
                                     using -a<kb> or INIT_HEAP_SIZE.      
ERROR: Could not allocate.           Check sizet definition.              
                                     Use 32 bit compiler mode.            
                                     Don't try to run as subproccess.     
remove <FLAG> in scmfig.h and        Do so and recompile files.           
recompile scm.                                                            
add <FLAG> in scmfig.h and                                                
recompile scm.                                                            
ERROR: Init5d2.scm not found.        Assign correct IMPLINIT in makefile  
                                     or scmfig.h.                         
                                     Define environment variable          
                                     SCM_INIT_PATH to be the full         
                                     pathname of Init5d2.scm.             
WARNING: require.scm not found.      Define environment variable          
                                     SCHEME_LIBRARY_PATH to be the full   
                                     pathname of the scheme library       
                                     [SLIB].                              
                                     Change library-vicinity in           
                                     Init5d2.scm to point to library or   
                                     remove.                              
                                     Make sure the value of               
                                     (library-vicinity) has a trailing    
                                     file separator (like / or \).        



File: scm.info,  Node: Testing,  Next: Reporting Problems,  Prev: Problems Running,  Up: Installing SCM

Testing
=======

Loading `r4rstest.scm' in the distribution will run an [R4RS]
conformance test on `scm'.

     > (load "r4rstest.scm")
     -|
     ;loading "r4rstest.scm"
     SECTION(2 1)
     SECTION(3 4)
      #<primitive-procedure boolean?>
         #<primitive-procedure char?>
            #<primitive-procedure null?>
               #<primitive-procedure number?>
     ...

Loading `pi.scm' in the distribution will enable you to compute digits
of pi.

     > (load "pi")
     ;loading "pi"
     ;done loading "pi.scm"
     ;Evaluation took 20 mSec (0 in gc) 767 cells work, 233 bytes other
     #<unspecified>
     > (pi 100 5)
     00003 14159 26535 89793 23846 26433 83279 50288 41971 69399
     37510 58209 74944 59230 78164 06286 20899 86280 34825 34211
     70679
     ;Evaluation took 550 mSec (60 in gc) 36976 cells work, 1548 bytes other
     #<unspecified>

Loading `bench.scm' will compute and display performance statistics of
SCM running `pi.scm'.  `make bench' or `make benchlit' appends the
performance report to the file `BenchLog', facilitating tracking
effects of changes to SCM on performance.

PROBLEM                              HOW TO FIX                           
Runs some and then machine crashes.  See above under machine crashes.     
Runs some and then ERROR: ...        Remove optimization option to C      
(after a GC has happened).           compiler and recompile.              
                                     #define SHORT_ALIGN in `scmfig.h'.   
Some symbol names print incorrectly. Change memory model option to C      
                                     compiler (or makefile).              
                                     Check that HEAP_SEG_SIZE fits        
                                     within sizet.                        
                                     Increase size of HEAP_SEG_SIZE (or   
                                     INIT_HEAP_SIZE if it is smaller      
                                     than HEAP_SEG_SIZE).                 
ERROR: Rogue pointer in Heap.        See above under machine crashes.     
Newlines don't appear correctly in   Check file mode (define OPEN_... in  
output files.                        `Init5d2.scm').                      
Spaces or control characters appear  Check character defines in           
in symbol names.                     `scmfig.h'.                          
Negative numbers turn positive.      Check SRS in `scmfig.h'.             
VMS: Couldn't unwind stack.          #define CHEAP_CONTIUATIONS in        
                                     `scmfig.h'.                          
VAX: botched longjmp.                                                     

Sparc(SUN-4) heap is growing out of control
     You are experiencing a GC problem peculiar to the Sparc.  The
     problem is that SCM doesn't know how to clear register windows.
     Every location which is not reused still gets marked at GC time.
     This causes lots of stuff which should be collected to not be.
     This will be a problem with any *conservative* GC until we find
     what instruction will clear the register windows.  This problem is
     exacerbated by using lots of call-with-current-continuations.