;; O Emacs, this is a -*- Lisp -*- file, despite appearance
;; 
;; Copyright (c) 1991-2002, The Numerical Algorithms Group Ltd.
;; All rights reserved.
;; 
;; Copyright (C) 2007-2011, Gabriel Dos Reis.
;; All rights reserved.
;;
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions are
;; met:
;;
;;     - Redistributions of source code must retain the above copyright
;;       notice, this list of conditions and the following disclaimer.
;;
;;     - Redistributions in binary form must reproduce the above copyright
;;       notice, this list of conditions and the following disclaimer in
;;       the documentation and/or other materials provided with the
;;       distribution.
;;
;;     - Neither the name of The Numerical Algorithms Group Ltd. nor the
;;       names of its contributors may be used to endorse or promote products
;;       derived from this software without specific prior written permission.
;;
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
;; IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
;; TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
;; PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
;; OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
;; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
;; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


;; 
;; -*- Abstract -*-
;; 
;;  This file defines the core of the system utilities for building
;;  Boot and OpenAxiom executable.  It essentially etablishes a namespace
;;  (package AxiomCore) and defines some macros and functions
;;  that need to be present during compilation and executable
;;  image construction.
;; 

(defpackage "AxiomCore"
  #+:common-lisp (:use "COMMON-LISP")
  #-:common-lisp (:use "LISP" "USER")
  #+(and :SBCL :SB-THREAD) (:use "SB-THREAD")
  #+(and :ECL :THREADS) (:use "MP")
  #+(and :CLISP :MT) (:use "THREADS")
  ;; For GCL we need to explicitly use the DEFPACKAGE, otherwise the
  ;; image obtained from compiler link will not work.  The root cause
  ;; is a non-ANSI compliant organization of GCL's implementation.
  #+:gcl (:use "DEFPACKAGE")
  ;; Clozure CL sequesters most of its useful extensions, in particular
  ;; threads, in the CCL package.
  #+:clozure (:use "CCL")
  (:export "%Thing"
	   "%Void"
	   "%Boolean"
	   "%String"
	   "%Symbol"
	   "%Short"
	   "%Bit"
	   "%Byte"
	   "%Char"
	   "%Bignum"
	   "%Integer"
	   "%Number"
	   "%IntegerSection"
	   "%DoubleFloat"
	   "%Atom"
	   "%Maybe"
	   "%Pair"
	   "%Node"
	   "%List"
	   "%Vector"
	   "%BitVector"
	   "%SimpleArray"

	   ;; Some common data structures
	   "makeTable"	  ; construct a hash table with a given comp function
	   "tableValue"	  ; value associated with a key in a table
	   "tableLength"  ; number of entries in the table.
	   "tableRemove!" ; remove an entry from a table

	   ;; IO
	   "$InputStream"
	   "$OutputStream"
	   "$ErrorStream"
	   
	   "inputBinaryFile"
	   "outputBinaryFile"
	   "inputTextFile"
	   "outputTextFile"
	   "closeFile"
	   "closeStream"
	   "prettyPrint"
	   "readLine"
	   "readExpr"

	   ;; compiler data structures
	   "%Mode"
	   "%Sig"
	   "%Code"
	   "%Env"
	   "%Form"
	   "%Triple"
	   "%Shell"
	   ;; functor data structures
	   "%FunctorData"
	   "%FunctorCoreData"
	   "%FunctorBytecode"
	   "%FunctorTemplate"
	   "%FunctorPredicateIndexTable"
	   "%FunctorOperatorDirectory"
	   "%FunctorCategoryTable"
	   "%FunctorAttributeTable"
	   "%FunctorDefaultTable"
	   "%FunctorLookupFunction"

	   "coreQuit"
           "fatalError"
           "internalError"
           "coreError"
           "errorCount"
           "countError"
	   "resetErrorCount"
           "warn"
	   "startCompileDuration"
	   "endCompileDuration"
           
	   "%ByteArray"
	   "makeByteArray"
	   "makeBitVector"
	   "makeString"

           "%hasFeature"
	   "%systemOptions"
	   "%systemArguments"
	   "%basicSystemIsComplete"
	   "%algebraSystemIsComplete"
	   "%nothing"
	   "%escapeSequenceAverseHost?"
	   
	   "$hostPlatform"
	   "$buildPlatform"
	   "$targetPlatform"

	   "$faslType"
	   "$effectiveFaslType"
	   "$NativeModuleExt"
	   "$systemInstallationDirectory"
	   "$NativeTypeTable"
	   "$LispOptimizeOptions"
	   "$StandardLinking"
	   "$ECLVersionNumber"
	   "$FilesToRetain"

	   "getOptionValue"
           "getCommandLineArguments"
           "$originalLispTopLevel"
           "link"
           "installDriver"
           "associateRequestWithFileType"
           "ensureTrailingSlash"
           "getOutputPathname"
           "loadPathname"
	   "loadFileIfPresent"
           "compileLispFile"
           "compileLispHandler"
           "Option"
	   "systemRootDirectory"
	   "systemLibraryDirectory"

	   "pathBasename"

           "IMPORT-MODULE"
	   "bootImport"
	   "CONCAT"
	   "$EditorProgram"

	   ;; numeric support
	   "%fNaN?"
           ))

(in-package "AxiomCore")

;; 
;; -*- Basic data types -*-
;; 

;; Type of nothing.  Bottom of the abstract machine type lattice.
;; Since Lisp functions always returns something, we cannot
;; use the `nil' type specifier (the ideal answer).  Second
;; best possibility is to have Void-returning functions
;; systematically return `nil'.  However, until the Lisp
;; backend is fixed, we will use the interpretation that a
;; Void-returning function may return anything, but nobody cares.
;; Hence, the choice below which contradicts the very first line
;; of this description.
(deftype |%Void| () 't)

(deftype |%Thing| () 't)

(deftype |%Boolean| () 'boolean)

(deftype |%String| () 'string)

(deftype |%Symbol| () 'symbol)

(deftype |%Short| () 'fixnum)

(deftype |%Bit| () 'bit)

(deftype |%Byte| () '(unsigned-byte 8))

(deftype |%Char| () 'character)

(deftype |%Bignum| () 'bignum)

(deftype |%Integer| () 'integer)

(deftype |%IntegerSection| (n) `(integer ,n))

(deftype |%DoubleFloat| () 'double-float)

(deftype |%Number| () 'number)

(deftype |%Atom| () 'atom)

(deftype |%Maybe| (s) `(or null ,s))

(deftype |%Pair| (u v)
  `(cons ,u ,v))

(deftype |%Node| (s)
  `(cons ,s null))

(deftype |%List| (s)
  `(or null (cons ,s)))

(deftype |%SimpleArray| (s) `(simple-array ,s))

(deftype |%Vector| (s) `(vector ,s))

(deftype |%BitVector| () '(simple-array bit))

(deftype |%Shell| () 'simple-vector)

(deftype |%Mode| () '(or symbol string cons))

(deftype |%Sig| () '(or symbol cons))

(deftype |%Code| () '(or |%Form| |%Char|))

(deftype |%Env| () '(or null cons))

(deftype |%Form| () '(or number symbol string cons))

(deftype |%Triple| () 
  '(cons |%Code| (cons |%Mode| (cons |%Env| null))))

;; Functor templates
(deftype |%FunctorTemplate| ()
  'simple-vector)

;; operator directory for functors.
(deftype |%FunctorOperatorDirectory| ()
  '(simple-array (or symbol fixnum)))

;; List of (attribute . predicate-index) pairs for functors.
(deftype |%FunctorAttributeTable| ()
  'list)

;; Lookup-function for functors.  For most functors, they are
;; either lookupIncomplete or lookupComplete.
;; Historical functors have lookupInTable.
(deftype |%FunctorLookupFunction| ()
  '|%Symbol|)

;; Functor predicate index table
(deftype |%FunctorPredicateIndexTable| ()
  '(simple-array fixnum))

;; vector of categories a functor instantiation may belong to.
(deftype |%FunctorCategoryTable| ()
  '(simple-array |%Form|))

;; vector of default category packages that a functor may implicitly use.
(deftype |%FunctorDefaultTable| ()
  '(simple-array (|%Maybe| |%Constructor|)))

;; sequence of `byte codes' for a functor
(deftype |%FunctorBytecode| ()
  '(simple-array fixnum))

;; PredicateIndex + DefaultTable + CategoryTable + Bytecode
(deftype |%FunctorCoreData| ()
  '(cons |%FunctorPredicateIndexTable|
	 (cons |%FunctorDefaultTable|
	       (cons |%FunctorCategoryTable| |%FunctorBytecode|))))
		     

;; The essential of what is needed to instantiate a functor.
;; This is the type of `infovec' properties of functors.
(deftype |%FunctorData| ()
  '(cons |%FunctorTemplate|
	 (cons |%FunctorOperatorDirectory|
	       (cons |%FunctorAttributeTable|
		     (cons |%Thing|
			   (cons |%FunctorLookupFunction| null))))))

;; 
;; -*- Configuration Constants -*-
;; 

;; The canonical triplets for host, build, and target.   For the moment,
;; they are all identical, for we don't support cross compilation yet.
(defconstant |$hostPlatform| "@host@")
(defconstant |$buildPlatform| "@build@")
(defconstant |$targetPlatform| "@target@")

;; How to invoke the host C++ compiler and linker flags
(defconstant oa-cxx "@CXX@")
(defconstant oa-ldflags "@LDFLAGS@")

;; The directory that contains the final installation directory, as
;; specified at configuration time (or in exoteric cases, as overriden
;; on the Make command line). 
(defconstant |$systemInstallationDirectory| 
  "@open_axiom_installdir@/")

;; File kinds to retain.
(defconstant |$FilesToRetain|
  '(@oa_keep_files@))

;; Lisp compiler optimization settings.
(defconstant |$LispOptimizeOptions|
  '(@oa_optimize_options@))

(proclaim '(optimize @oa_optimize_options@))

;; Enablig profiling of generated Lisp codes.
(eval-when (:compile-toplevel :load-toplevel :execute)
	   (defconstant |$EnableLispProfiling| @oa_enable_profiling@))

(eval-when (:compile-toplevel :load-toplevel :execute)
	   (progn #+sbcl (require :sb-sprof)))

;; Return true if the full OpenAxiom algebra system is completed
;; built.
(defun |%algebraSystemIsComplete| nil
  (member :open-axiom-algebra-system *features*))

;; Return true if the basic OpenAxiom system is complete.  This means
;; that we have a compiler and an interpreter, but not necessarily
;; the algebras.
(defun |%basicSystemIsComplete| nil
  (or (|%algebraSystemIsComplete|)
      (member :open-axiom-basic-system *features*)))

;; Return true if the Boot system is completely bootstrapped.
(defun boot-completed-p nil
  (or (|%basicSystemIsComplete|)
      (member :open-axiom-boot *features*)))

;; 
;; -*- Hosting Lisp System -*-
;;

(eval-when (:compile-toplevel :load-toplevel :execute)
	   (progn
	     (setq *read-default-float-format* 'double-float)
	     (setq *load-verbose* nil)))

;; True means that the base Lisp system uses conventional C-style
;; program linking model, whereby programs are constructed by linking
;; separately compiled units.  By constrast, many Lisp systems build
;; executable programs by loading FASLs into core and dumping the resulting
;; image on disk.
(defconstant |$StandardLinking|
  (eq '@oa_standard_linking@ 'yes))

;; Almost every supported Lisp use dynamic link for FFI.
;; ECL's support is partial.  GCL-2.6.x hasn't discovered it yet.
(defconstant |$useDynamicLink|
  #+:ecl (member :dffi *features*)
  #+:gcl nil
  #-(or :ecl :gcl) t)

;; The top level read-eval-print loop function of the base
;; Lisp system we are using.  This is a very brittle way
;; of achieving something conceptually simple.  
(defconstant |$originalLispTopLevel|
  #+:ecl #'si::top-level
  #+:gcl #'si::top-level
  #+:sbcl #'sb-impl::toplevel-init
  #+clisp #'system::main-loop
  #+:clozure nil			; don't know, kept private
  )

;; Lisp source file extension.
(defconstant |$LispFileType| "lisp")

;; Extenstion of FASL files.
(defconstant |$faslType|
  (pathname-type (compile-file-pathname "foo.lisp")))

(defconstant |$effectiveFaslType|
  #+:ecl (pathname-type (compile-file-pathname "foo.lisp" :system-p t))
  #-:ecl |$faslType|)

;; Extension of file containers for native shared libraries.
(defconstant |$NativeModuleExt|
  (cond (|$useDynamicLink| "@SHREXT@")
	(t ".@LIBEXT@")))

;; Return true if the host is escape sequence averse.  This is notably
;; true on windows-based builds (win32 or win64)
(defun |%escapeSequenceAverseHost?| ()
  (or (member :win32 *features*)
      (member :windows *features*)))


(defconstant |$EditorProgram| "@oa_editor@")

;; Token expression to indicate absence of value or bottom value.
;; This is also the bottom value of the Maybe domain.
(defconstant |%nothing| :|OpenAxiomNoValue|)

;; Base name of the native core runtime library
(defconstant |$CoreLibName|
  "open-axiom-core")

;; C runtime needed by the target system; e.g. -lm or -lwinsock
(defconstant |$ExtraRuntimeLibraries|
  '(@oa_c_runtime_extra@))

(defun extra-runtime-libs nil
  (if (boot-completed-p)
      (append
       (list (concatenate 'string "-L" (|systemLibraryDirectory|))
	     (concatenate 'string "-l" |$CoreLibName|))
       |$ExtraRuntimeLibraries|)
    |$ExtraRuntimeLibraries|))


#+:clisp 
(eval-when (:compile-toplevel :load-toplevel :execute)
	   (progn
	     (setf custom:*ansi* t)
	     (setf custom:*floating-point-contagion-ansi* t)
	     (setf custom:*warn-on-floating-point-contagion* t)
	     (setf custom:*trace-indent* t)
	     (setf custom:*foreign-encoding* 
		   (ext:make-encoding :charset charset:iso-8859-1))))


;; ECL is a moving target, especially, in its FII support.  Track
;; versions as poor man safeguard to portability chaos.
(defconstant |$ECLVersionNumber|
  #-:ecl -1
  #+:ecl (let ((ver (find-symbol "+ECL-VERSION-NUMBER+" "EXT")))
	   (cond (ver (symbol-value ver))
		 (t -1))))

;; -*- Hash table -*-
(defmacro |makeTable| (cmp)
  `(make-hash-table :test ,cmp))

(defmacro |tableValue| (ht k)
  `(gethash ,k ,ht))

(defmacro |tableRemove!| (ht k)
  `(remhash ,k ,ht))

(defmacro |tableLength| (ht)
  `(hash-table-count ,ht))

;; -*- File IO -*-

(defparameter |$InputStream| (make-synonym-stream '*standard-input*))
(defparameter |$OutputStream| (make-synonym-stream '*standard-output*))
(defparameter |$ErrorStream| (make-synonym-stream '*standard-output*))

(defun |inputBinaryFile| (f)
  (open f
	:direction :input
	:element-type 'unsigned-byte
	:if-does-not-exist nil))

(defun |outputBinaryFile| (f)
  (open f
	:direction :output
	:element-type 'unsigned-byte
	:if-exists :supersede))

(defun |inputTextFile| (f)
  (open f
	:direction :input
	:if-does-not-exist nil))

(defun |outputTextFile| (f)
  (open f
	:direction :output 
	:if-exists :supersede))

(defun |closeFile| (f)
  (close f))

(defmacro |closeStream| (s)
  `(close ,s))

;; Read a line from the input text file.  Quietly return
;; %nothing at end of file.
(defmacro |readLine| (f)
  `(read-line ,f nil |%nothing|))

(defmacro |readByte| (f)
  `(read-byte ,f nil |%nothing|))

(defmacro |readExpr| (f)
  `(read ,f nil |%nothing|))

;; Pretty-print a lisp form on a given output stream.
(defun |prettyPrint| (x &optional (s |$OutputStream|))
  (let ((*print-pretty* t)
	(*print-array* t)
	(*print-circle* t)
	(*print-length* nil)
	(*print-level* nil))
    (prin1 x s)))

;; 
;; -*- OpenAxiom filesystem -*-
;; 

(defconstant |$BootFileType| "boot")
(defconstant |$LibraryFileType| "spad")
(defconstant |$ScriptFileType| "input")

;; Canonalize source file extensions
(defun |getFileType|(file)
  (let ((file-type (pathname-type file)))
    (cond ((or (equal "clisp" file-type)
               (equal "lsp" file-type))
           |$LispFileType|)
          (t file-type))))

;; Returns the root directory of the running system.
;; A directory specified on command line takes precedence
;; over directory specified at configuration time.
(defun |systemRootDirectory| nil
  (let ((dir (assoc (|Option| "system") (|%systemOptions|))))
    (if (not (null dir))
	(|ensureTrailingSlash| (cdr dir))
      |$systemInstallationDirectory|)))

;; Returns the directory containing the core runtime support
;; libraries, either as specified on command line, or as inferred
;; from the system root directory.
(defun |systemLibraryDirectory| nil
  (let ((dir (assoc (|Option| "syslib") (|%systemOptions|))))
    (if (not (null dir))
	(|ensureTrailingSlash| (cdr dir))
      (concatenate 'string (|systemRootDirectory|) "lib/"))))


;; Return the list of linkable fasls in in the directory `dir'.
(defun linkset-from (dir)
  (mapcar #'(lambda(f) (concatenate 'string dir f))
	  (with-open-file (stream (concatenate 'string dir "linkset"))
			  (read stream t))))

;; Return a path to the the subdirectory `subdir' within the 
;; OpenAxiom filesystem.
(defun system-subdirectory (subdir)
  (concatenate 'string (|systemRootDirectory|) subdir))

;; Like linkset-from when `feature' in on the features list.
(defun linkset-from-if (dir feature)
  (if (member feature *features*)
      (linkset-from (system-subdirectory dir))
    nil))

;; Return a complete list of fasls as appropriate for building
;; an executable program user thought consists only of `fasls'.
(defun complete-fasl-list-for-link (fasls)
  (append (linkset-from-if "lisp/" :open-axiom-base-lisp)
	  (linkset-from-if "boot/" :open-axiom-boot)
	  (map 'list #'|compileFilePathname| fasls)))

;; 
;; -*- OpenAxiom Driver Table -*-
;; 

;; Global map from requests  to drivers.
;; Ideally we want to handle
;;    --help: just print a help menu and exit
;;    --version: Print version information and exit
;;    --system=<dir>: specify <dir> as the root directory
;;    --sysalg=<dir>: specify <dir> as directory containing algebras
;;    --compile: boot or lisp files
;;    --translate: boot files
;;    --prologue=<lisp-code>: Run <lisp-code> just before the main entry point.
;;    --make: boot, lisp, or fasl files
(defparameter |$driverTable| 
  (make-hash-table :test #'equal :size 10))


;; Look up the driver that can handle REQUEST.  Returns nil when
;; no driver exists.
(defun |getDriver| (request)
  (gethash request |$driverTable|))

;; Associate DRIVER with REQUEST.
;; There can exist at most one driver per request.
(defun |installDriver| (request driver)
  (when (|getDriver| request) 
    (|internalError| "attempt to override driver"))
  (setf (gethash request |$driverTable|) driver))

(defun |useFileType?| (request)
  (get request 'use-file-type))

;; Register DRIVER for a REQUEST for a file with FILE-TYPE extension.
(defun |associateRequestWithFileType| (request file-type driver)
  ;; If a driver is already installed, it must be non-null. 
  ;; We don't allow overriding at the moment.
  (let ((key (cons request file-type)))
    (unless (|useFileType?| request)
      (setf (get request 'use-file-type) file-type))
    (|installDriver| key driver)))


;; 
;; -*- OpenAxiom Command Line Parsing -*-
;; 

;; Return a symbol object represensing option named OPT, without leading
;; double dash (--).
(defun |Option| (opt)
  (intern (string opt) (find-package "AxiomCore")))


;; Translate option value:
;;    "no"   -> nil
;;    "yes"  -> t
;;    [0-9]+ -> integer value
;;   otherwise -> input string unmolested
(defun translate-option-value (val)
  (cond ((string= val "no") nil)
	((string= val "yes") t)
	(t (multiple-value-bind (ival idx)
	    (parse-integer val :junk-allowed t)
	    (cond ((null ival) val)
		  ((eql idx (length val)) ival)
		  (t val))))))
				
;; Returns a pair (name . value) if OPTION if of the form "--name=value",
;; where name is a symbol and value is a string.  Otherwise, if
;; OPTION is of the form "--name", returns the symbol name.
(defun |parseOption| (option)
  (setq option (subseq option 2))
  (let ((p (position #\= option)))
    (if p
        (cons (|Option| (subseq option 0 p)) 
	      (translate-option-value (subseq option (1+ p))))
      (|Option| option))))

;; Returns the value specified for OPTION. Otherwise, return nil
(defun |getOptionValue| (opt &optional (options (|%systemOptions|)))
  (let ((val (assoc (|Option| opt) options)))
    (cond (val (cdr val))
          (t nil))))

;; Walk through the command line arguments ARGV, separating options
;; of the form --opt or --opt=val into an a-list, and the rest
;; of the command line into a list.  The processing stop as soon as
;; a non-option form is encountered. OPTIONS-SO-FAR accumulates the
;; the list of processed options.
(defun |processCommandLine| (argv options-so-far args-so-far)
  (cond ((null argv)
	 ;; no more command-line argument to process
	 (values options-so-far (nreverse args-so-far)))
	((equal "--" (car argv))
	 ;; end of command-line options
	 (values options-so-far (concatenate 'list 
					     (nreverse args-so-far)
					     (cdr argv))))
	((or (< (length (car argv)) 2)
	     (not (equal "--" (subseq (car argv) 0 2))))
	 ;; not a command-line option
	 (|processCommandLine| (cdr argv) 
	                       options-so-far 
	                       (cons (car argv) args-so-far)))
	(t (let ((option (|parseOption| (car argv))))
	     (cond ((symbolp option)
		    (|processCommandLine| (cdr argv)
		                          (cons (cons option t)
						options-so-far)
					  args-so-far))
		   ((consp option) 
		    (|processCommandLine| (cdr argv) 
		                          (cons option options-so-far)
					  args-so-far))
		   (t (|internalError|
		       (format nil "processCommandLine: unknown option ~S"
			       option))))))))

;; 
;; -*- Building New Lisp Images -*-
;; 
;; At many points, the build machinery makes new Lisp images that
;; are the results of augmenting a given Lisp image with new 
;; Lisp files (either compiled or in source form).  For most Lisp
;; implementations, this is done by loading the Lisp files in the 
;; current image and dumping the result on disk as an executable.


(defun |getOutputPathname| (options)
  (let ((output-option (assoc (|Option| "output") options)))
    (when output-option
        ;; If an output file name was specified on the command line, it
        ;; is so relative to the current working directory.  In 
        ;; particular we want to prevent overly zelous SBCL to mess
        ;; around with the output file when we call compile-file-pathname. 
        ;; The SBCL-specific hack below does not work all the time, but in
        ;; most cases, it is OK.
        #+:sbcl (merge-pathnames (cdr output-option)
                                 *default-pathname-defaults*)
        #-:sbcl (cdr output-option))))


(defun |getMainEntryPoint| (options)
  (|getOptionValue| (|Option| "main") options))

(defun |getPrologue| (options)
  (let ((prologue (|getOptionValue| (|Option| "prologue") options)))
    (if prologue (read-from-string prologue) nil)))

;; Save current image on disk as executable and quit.
(defun |saveCore| (core-image &optional (entry-point nil))
  ;; When building the OpenAxiom system, and in many other cases I suspect,
  ;; the main entry point is some function in a package not known to
  ;; the Lisp system at compile time, so we have delayed the 
  ;; evaluation of the entry point in a form of a suspension.  At this
  ;; point we must have all data needed to complete the evaluation.
  (when (consp entry-point)
    (setq entry-point (apply (car entry-point) 
                             (cdr entry-point))))
  #+:sbcl (if (null entry-point)
              (sb-ext::save-lisp-and-die core-image :executable t)
            (sb-ext::save-lisp-and-die core-image 
                                       :toplevel entry-point
                                       :executable t))
  #+:gcl (progn 
           (when entry-point 
             (setq si::*top-level-hook* entry-point))
           (system::save-system core-image))
  #+:clisp (progn 
             (if entry-point
                 (ext::saveinitmem core-image 
                                   :init-function entry-point
                                   :executable t
                                   :norc t
				   :quiet t
                                   )
               (ext::saveinitmem core-image 
                                 :executable t
                                 :norc t
                                 ))
             (ext::quit))
  #+:clozure (progn
	       (ccl:save-application core-image
				     :toplevel-function entry-point
				     :error-handler :quit
				     :prepend-kernel t)
	       (return-from |saveCore|))
  (error "don't know how to save Lisp image"))


;; 
;; -*- Program Termination -*-
;; 
;; When working in batch mode, we need to return so-called `exit status'
;; to the calling shell.  Common Lisp has no provision for that ---
;; not even exiting from the toplevel read-eval-print loop.  Most
;; Lisp implementations provide an `exit' function as extensions, though
;; they don't agree on the exact spelling, therefore on the API.

;; The function |coreQuit| is our abstractions over those variabilties.
;; It takes an optional small integer value, the exit status code to
;; return to the calling shell.  When no exit status code is specified,
;; it would return $0$, meaning that everything is OK.
(defun |coreQuit| (&optional (status 0))
  #+:sbcl (sb-ext:quit :unix-status status)
  #+:clisp (ext:quit status)
  #+:gcl (si::bye status)
  #+:ecl (ext:quit status)
  #+:clozure (ccl:quit status)
  #-(or :sbcl :clisp :gcl :ecl :clozure) 
  (error "`coreQuit' not implemented for this Lisp"))


;; 
;; -*- Basic Diagnostic Routines -*-
;; 
;;    For the most basic batch stuff, we want:
;;       (1) fatal error: output message and exit with nonzero status
;;       (2) internal error: same.  This is for use on reporting internal
;;           consistency error.
(defun |diagnosticMessage|(prefix msg)
  (let ((text (concatenate 'string prefix ": " msg)))
    (write-line text *error-output*)))

;; Keep count of number of hard errors.
(defparameter |$errorCount| 0)

(defun |errorCount| nil
  |$errorCount|)

(defun |countError| nil
  (setq |$errorCount| (1+ |$errorCount|)))

(defun |resetErrorCount| nil
  (setq |$errorCount| 0))

;; utils

;; GCL has a hard limit on the number of arguments for concatenate.
;; However, it has a specialized versions for catenating string
;; that seems immune to that hard limit.  Specialized accordingly.
(defun |catenateStrings| (&rest l)
  #+ :gcl (apply #'si::string-concatenate l)
  #- :gcl (apply #'concatenate 'string l))

(defun concat (a b &rest l)
  (cond ((bit-vector-p a)
	 (apply #'concatenate 'bit-vector a b l))
	(t 
	 (apply #'|catenateStrings| 
		(string a)
		(string b) 
		(mapcar #'string l)))))

(defun |fatalError| (msg)
  (|countError|)
  (|diagnosticMessage| "fatal error" msg)
  (|coreQuit| 1))

(defun |internalError| (msg)
  (|countError|)
  (|diagnosticMessage| "internal error" msg)
  (|coreQuit| 1))

(defun |coreError| (msg)
  (|countError|)
  (|diagnosticMessage| "error"
   (cond ((consp msg) 
          (reduce #'(lambda (x y)
                      (concatenate 'string x y))
                  msg :initial-value ""))
         (t msg)))
  nil)

(defun |warn| (msg)
  (|diagnosticMessage| "warning"
   (cond ((consp msg) 
          (reduce #'(lambda (x y)
                      (concatenate 'string x y))
                  msg :initial-value ""))
         (t msg))))

;; 
;; -*- Command Line Arguments -*-

(defparameter |$sysOpts| nil)
(defparameter |$sysArgs| nil)

(defun |%systemOptions| ()
  |$sysOpts|)

(defun |%systemArguments| ()
  |$sysArgs|)

;; 
;; Ideally, we would just like to have a traditional command line
;; passing mechanism from the shell to the application.  That 
;; mechanism works fine with GCL.  Some Lisp implementations such as
;; SBCL or CLISP will insist on processing the command lines.  Some
;; such as CLISP will baffle when they hit an option they don't 
;; understand.  Which is silly.  It seems like the only common ground,
;; as ever, is to go with the most annoying behaviour and penalize
;; the good "citizen", sensible, Lisp implementations interfaces.
;; Consequently, we have standardized on the the following practice:
;; always issue a double bash (--) after the command line, and afterwards
;; supply options and other arguments.  The double dash has the effect
;; of dissuading the underlying lisp implementation of trying to
;; process whatever comes after as options.  

;; Command line arguments: equivalent of traditional `argv[]' from
;;  systems programming world.
(defun |getCommandLineArguments| nil
  #-(or :gcl :sbcl :clisp :ecl :clozure) 
  (|fatalError| "don't know how to get command line args")
  (let* ((all-args  
	  #+:clozure ccl:*command-line-argument-list*
          #+:ecl (ext:command-args)
          #+:gcl si::*command-args*
          #+:sbcl sb-ext::*posix-argv*
          #+:clisp (coerce (ext::argv) 'list))
         (args (member "--" all-args :test #'equal)))
    (cons (car all-args) (if args (cdr args) args))))


;; 
;; -*- Building Standalone Executable -*-
;; 
;; Build a standalone excutable from LISP-FILES -- a list of
;; pathnames designating compiled source files (either FASLs, for
;; most Lisp systems, or object files for systems like ECL.)
;; ENTRY-POINT is the entry point of the program.  If not supplied, or
;; if null, then the entry entry is supposed to be the top level
;; read-eval-print loop of original Lisp system.
;; Note, despite the name LISP-FILEs, we do not expect bare Lisp source
;; files here.  We do insist on FASLs.  There is no check for that at
;; this point.  You have been warned.
(defun |link| (core-image lisp-files 
			  &optional (entry-point nil) (prologue nil))
  (if (and entry-point (stringp entry-point))
      (setq entry-point `(read-from-string ,entry-point)))
  #-:ecl 
  (progn
    (mapcar #'(lambda (p) (|loadOrElse| p)) lisp-files)
    (eval prologue)
    (|saveCore| core-image entry-point))
  #+:ecl 
  (let* ((compiler::*ld* oa-cxx)
	 (compiler::*ld-flags* (concatenate 'string 
					    compiler::*ld-flags*
					    " " oa-ldflags)))
    (progn
      (unless entry-point
	(setq entry-point #'si::top-level))
      (c:build-program core-image 
		       :lisp-files 
		       (complete-fasl-list-for-link lisp-files)
		       :ld-flags (extra-runtime-libs)
		       :epilogue-code 
		       `(progn
			  (pushnew :open-axiom-base-lisp *features*)
			  ,prologue
			  (funcall ,entry-point)))
      (|coreQuit|)))
  )


;; 
;; -*- Handling Command Line Arguments -*-
;; 

(defun |handleRequest| (prog-name request options args)
  (let ((driver (|getDriver| request)))
    (when (null driver) 
      (|fatalError| (format nil "invalid option `--~a'" (string request))))
    (funcall driver prog-name options args)))

(defun |hasHandler?| (request)
  (or (|getDriver| request)
      (|useFileType?| request)))

(defun run-driver (prog-name action options args)
  (cond ((|useFileType?| (car action))
	 ;; If the action is file-type dependent, make sure
	 ;; we have at least one file.
	 (unless (not (null args))
	   (|coreError| "missing input files"))
	 (dolist (f args t)
	   (let* ((name (car action))
		  (file-type (or (|getFileType| f)
				 (|useFileType?| name)))
		  (request (cons name file-type)))
	     (unless (|handleRequest| prog-name request options f)
	       (return nil)))))
	(t (|handleRequest| prog-name (car action) options args))))


(defun |handleCommandLine| (prog-name options args)
  (when (or options args)
    (let (action)
      (dolist (opt options)
	(cond ((stringp (cdr opt))
	       ;; In general, nothing is to be done for option value 
	       ;; specifications, except when they require special handlers.
	       (when (|hasHandler?| (car opt))
		 (unless (|handleRequest| prog-name (car opt) options args)
		   (return nil))))

	      ;; Don't allow for more than one driver request.
	      ((|hasHandler?| (car opt))
	       (if (not (null action))
		   (|coreError| "multiple driver request")
		 (setq action opt)))))
      ;; By now, we hope to have figured out what action to perform.
      (cond ((consp action)
	     (run-driver prog-name action options args))
	    (t nil)))))

;; 
;; -*- --help Handler -*-
;; 

;; Print help screen
(defun |printUsage| (prog-name)
  (write-line "usage:")
  (write-line 
   (concatenate 'string prog-name " -- [options] [files]"))
  (write-line "option:")
  (write-line "   --help                   print this message")
  (write-line "   --system=<dir>           set <dir> to the root directory of running system")
  (write-line "   --sysalg=<dir>           set <dir> to the algebra directory of running system")
  (write-line "   --compile                compile file")
  (write-line "   --output=<out>           set output file to <out>")
  (write-line "   --load-directory=<dir>   use <dir> as search path for modules")
  (write-line "   --make                   create an executable"))

(defun |helpHandler|(prog-name options args)
  (declare (ignore options args))
  (|printUsage| prog-name)
  (|coreQuit|))

(|installDriver| (|Option| "help") #'|helpHandler|)


;; 
;; -*- --make Handler -*-
;; 

(defun |makeHandler| (prog-name options args)
  (declare (ignore prog-name))
  (unless (> (length args) 0)
    (|fatalError| "--make requires at least one file"))

  (|link| (or (|getOutputPathname| options) "a.out") 
          args 
          (|getMainEntryPoint| options)
	  (|getPrologue| options))
  (|coreQuit|))

(|installDriver| (|Option| "make") #'|makeHandler|)


;; 
;; -*- --load-directory Handler -*-
;; 

;; Remember value specified for the --load-dircetory option.  Notice
;; that this is the direct handler for that option.  Consequently, it
;; passed all three arguments: PROG-NAME OPTIONS ARGS.  Only the second
;; argument is of interest.
(defun |recordLoadDirectory| (prog-name options args)
  (declare (ignore prog-name args)
           (special |$LoadDirectories|))
  (let ((load-option (assoc (|Option| "load-directory") options)))
    (unless load-option
      (|internalError| "`recordLoadDirectory' called without option"))
    (unless (cdr load-option)
      (|fatalError| "--load-directory option without value"))
    (pushnew (cdr load-option) |$LoadDirectories| :test #'equal)
    ))

(|installDriver| (|Option| "load-directory")  #'|recordLoadDirectory|)

;; 
;; -*- --compile Handler for Lisp Source Files -*-
;; 
(declaim (inline |compileFilePathname|))
(defun |compileFilePathname| (file)
  #-:ecl (compile-file-pathname file)
  #+:ecl (compile-file-pathname file :type :object))

(defun |currentDirectoryName| nil
  (let* ((dir (namestring (truename "")))
         (n (1- (length dir))))
    (if (char= (char dir n) #\/)
        (subseq dir 0 n)
      dir)))    

;; Compile Lisp source files to target object code.  Most of the time
;; this function is called externally to accomplish just that: compile
;; a Lisp file.  So, by default, we exit the read-eval-print loop after
;; the task is done.
;; 
;; NOTE: The Lisp system ECL has an interesting compilation and program
;; build model.  It distinguishes between FASL files (results of 
;; compilation usable as operand to LOAD) and object files (result of
;; compilation usable to build standalone programs).  We are primarily
;; interested in producing compiled files that can be used to produce
;; standalone programs.  Consequently we must convince ECL to produce
;; object files.  Notice that when program components require that
;; previously compiled files be loaded in the startup environment, 
;; the system will load the FASL file.  So, we end up with a 2-step
;; compilation process for ECL:
;;   (1) compile as object code;
;;   (2) build a FASL from the result of (1).

(defun |compileLispFile| (file out-file)
  ;; When OUT-FILE does not have a specified parent directory, it is
  ;; implied that the compiled file is placed in the current directory.
  ;; This is a very common convention on traditional systems and
  ;; environments.  However GCL would insist to pick the parent
  ;; directory from FILE, which clearly is bogus.  
  ;; Consequently, we must convince GCL to do what we expected.
  #+gcl (when (and (pathname-directory file)
                   (not (pathname-directory out-file)))
          (setq out-file 
                (make-pathname :name (pathname-name out-file)
                               :type (pathname-type out-file)
                               :directory (list (|currentDirectoryName|)))))
  (unwind-protect
      (progn
	(|startCompileDuration|)
	(multiple-value-bind (result warning-p failure-p) 
	 #-:ecl (compile-file file :output-file out-file)
	 #+:ecl (if |$EnableLispProfiling|
		    (compile-file file :output-file out-file :system-p t
				  :c-file t :h-file t)
		  (compile-file file :output-file out-file :system-p t))
	 #+:ecl 
	 (let ((compiler::*ld* oa-cxx))
	   (if (and result (not failure-p)
		    (null (c::build-fasl (compile-file-pathname out-file)
					 :lisp-files `(,out-file)
					 :ld-flags (extra-runtime-libs))))
	       (setq result nil)))
	 (cond ((null result) 
		(|coreError| "compilation of Lisp code failed"))
	       (failure-p
		;; Since we believe the source code must
		;; be fixed, we don't want to leave
		;; the generated FASL behing us, as that
		;; would confuse both users and tools.
		(delete-file result)
		(|coreError| "Lisp code contained errors"))
	       (warning-p
		(|warn| "Lisp code contained warnings")))
	 result))
    (|endCompileDuration|)))

(defun |compileLispHandler| (prog-name options in-file)
  (declare (ignore prog-name))
  (let ((out-file (|compileFilePathname| (or (|getOutputPathname| options)
					     in-file))))
    (|compileLispFile| in-file out-file)))

(|associateRequestWithFileType| (|Option| "compile") |$LispFileType|
 #'|compileLispHandler|)

;; 
;; -*- Predefined System Entry Point -*-
;; 

;; The top level entry point to most saved Lisp image.
(defun |topLevel|()
  (let ((*package* (find-package "AxiomCore"))
	(command-args (|getCommandLineArguments|)))
    (when (null command-args) 
      (|internalError| "empty command line args"))
    ;; Existing system programming practive, and POSIX, have it
    ;; that the first argument on the command line is the name
    ;; of the current instantiation of the program.
    ;; We require at least two arguments:
    ;;    (0) the program name
    ;;    (1) either one of --help or --version, or
    ;;        a filename.
    (multiple-value-bind 
     (options args) (|processCommandLine| (cdr command-args) nil nil)

     (setq |$sysOpts| options)
     (setq |$sysArgs| args)
                        
     ;; Run the system-specific initialization.
     (when (fboundp '|%sysInit|)
       (funcall (symbol-function '|%sysInit|)))
     
     (when (|handleCommandLine| (car command-args) options args)
       (|coreQuit| (if (> (|errorCount|) 0) 1 0))))))


;; 
;; -*- Filesystem Utilities -*-
;; 

;; Make sure that directory name DIR ends with a slash.
(defun |ensureTrailingSlash| (dir)
  (let ((l (length dir)))
    (unless (> l 0)
      (|fatalError| "null directory name"))
    (if (char= (char dir (- l 1)) #\/)
        dir
      (concatenate 'string dir "/"))))


;; Return the basename (without extension) of a file.
(defun |pathBasename| (file)
  (pathname-name file))

;; 
;; -*- Modules in OpenAxiom -*-
;; 

;; List of directories to search for FASLs.
(defparameter |$LoadDirectories| nil)
;; List of FASLs imported

(defparameter |$ImportedModules| nil)
;; Return true if MODULE is known to have been imported or loaded.

(defun |getModuleInternalSymbol| (module)
  (intern module (find-package "AxiomCore")))

(defun |alreadyLoaded?| (module)
  (get (|getModuleInternalSymbol| (namestring module))
       '|AxiomCore.loaded|))

;; Remember that MODULE was imported or loaded.
(defun |noteUnitLoaded| (module)
  (setf (get (|getModuleInternalSymbol| (namestring module))
	     '|AxiomCore.loaded|) t))

;; We are searching for MODULE (currently a FASL) in DIRECTORY.  So, this
;; function returns a (tentative) pathname designating that module.
(defun |loadPathname| (module dir)
  (setq dir (|ensureTrailingSlash| dir))
  (make-pathname :directory (pathname-directory dir)
                 :name module
                 #-:ecl :type #-:ecl |$faslType|))

(defun |btxPthaname| (module dir)
  (setq dir (|ensureTrailingSlash| dir))
  (make-pathname :directory (pathname-directory dir)
                 :name module
		 :type "btx"))

(defun |loadFileIfPresent| (file)
  (load file :if-does-not-exist nil))

(defun |loadIfPresent| (module)
  (if (|alreadyLoaded?| module)
      module
    (when (|loadFileIfPresent| module)
      (|noteUnitLoaded| module)
      module)))

(defun |loadOrElse| (module)
  (if (|alreadyLoaded?| module)
      module
    (when (load module :if-does-not-exist :error)
      (|noteUnitLoaded| module)
      module)))

(defun import-module-if-present (module dir)
  (or (|loadIfPresent| (|btxPthaname| module dir))
      (|loadIfPresent| (|loadPathname| module dir))))

(defun do-import-module (module directories)
  (cond ((null directories)
	 (|fatalError| 
	  (format nil 
		  "module ~S not found in search path ~S"
		  module 
		  |$LoadDirectories|)))
	(t
	 (unless (import-module-if-present module (car directories))
	   (do-import-module module (cdr directories))))))

(defun |importModule| (module)
  (do-import-module module |$LoadDirectories|))

(defmacro import-module (module)
  `(progn (eval-when 
           #+:common-lisp (:compile-toplevel :load-toplevel :execute)
           #-:common-lisp (compile load eval)
	   (if (compile-time-p)
	       (|importModule| ,module)))))

(defmacro |bootImport| (module)
  `(|importModule| ,module))

;; 
;; -*- Feature Tests in Boot -*-
;; 

(defun |%hasFeature| (f)
  (member f *features* :test #'eq))

(defun |startCompileDuration| nil
  (push :open-axiom-compile-time *features*))

(defun |endCompileDuration| nil
  (delete :open-axiom-compile-time *features*))

(defun compile-time-p nil
  (member :open-axiom-compile-time *features*))

;; -*- Lisp Implementatiom-dependent Supports -*-

#+ :sbcl
(require "sb-posix")

#+ :sbcl
(defun shoe-provide-module(name)
  (load name)
  (provide name))

#+ :sbcl
(eval-when (:load-toplevel :execute)
   (pushnew #'shoe-provide-module sb-ext:*module-provider-functions*))

;; 
;; -*-* Numerics support -*-
;; 
(defmacro |%fNaN?| (x)
  #+:sbcl `(sb-ext:float-nan-p ,x)
  #+:ecl `(ext:float-nan-p ,x)
  #-(or :sbcl :ecl) `(/= ,x ,x))

;; 
;; -*- Native Datatype correspondance -*-
;; 

;; Datatype for buffers mostly used for transmitting data between
;; the Lisp world and Native World.
(deftype |%ByteArray| ()
  '(simple-array (unsigned-byte 8)))

(declaim (ftype (function (fixnum) |%ByteArray|) |makeByteArray|))
(defun |makeByteArray| (n)
  (make-array n 
	       :element-type '(unsigned-byte 8)
	       :initial-element 0))

(defmacro |makeBitVector| (n)
  `(make-array ,n :element-type 'bit :initial-element 0))

(defun |makeString| (n &optional (c (code-char 0)))
  (make-string n :initial-element c))

;; native data type translation table
(defconstant |$NativeTypeTable|
  '((|void|    . @void_type@)
    (|char|    . @char_type@)
    (|int|     . @int_type@)
    (|float|   . @float_type@)
    (|double|  . @double_type@)
    (|string|  . @string_type@)))