ecl/src/cmp/cmpdefs.lsp

;;;;  -*- Mode: Lisp; Syntax: Common-Lisp; Package: C -*-
;;;;
;;;;  Copyright (c) 1984, Taiichi Yuasa and Masami Hagiya.
;;;;  Copyright (c) 1990, Giuseppe Attardi.
;;;;
;;;;    This program is free software; you can redistribute it and/or
;;;;    modify it under the terms of the GNU Library General Public
;;;;    License as published by the Free Software Foundation; either
;;;;    version 2 of the License, or (at your option) any later version.
;;;;
;;;;    See file '../Copyright' for full details.

;;;; CMPDEF	Definitions

(si::package-lock "CL" nil)

(defpackage "C"
  (:nicknames "COMPILER")
  (:use "FFI" "CL" #+threads "MP")
  (:export "*COMPILER-BREAK-ENABLE*"
	   "*COMPILE-PRINT*"
	   "*COMPILE-TO-LINKING-CALL*"
	   "*COMPILE-VERBOSE*"
	   "*CC*"
	   "*CC-OPTIMIZE*"
           "*USER-CC-FLAGS*"
           "*USER-LD-FLAGS*"
           "*SUPPRESS-COMPILER-NOTES*"
           "*SUPPRESS-COMPILER-WARNINGS*"
           "*SUPPRESS-COMPILER-MESSAGES*"
	   "BUILD-ECL"
	   "BUILD-PROGRAM"
           "BUILD-FASL"
	   "BUILD-STATIC-LIBRARY"
	   "BUILD-SHARED-LIBRARY"
	   "COMPILER-WARNING"
	   "COMPILER-NOTE"
	   "COMPILER-MESSAGE"
	   "COMPILER-ERROR"
	   "COMPILER-FATAL-ERROR"
	   "COMPILER-INTERNAL-ERROR"
	   "COMPILER-UNDEFINED-VARIABLE"
	   "COMPILER-MESSAGE-FILE"
	   "COMPILER-MESSAGE-FILE-POSITION"
	   "COMPILER-MESSAGE-FORM"
	   "*SUPPRESS-COMPILER-WARNINGS*"
	   "*SUPPRESS-COMPILER-NOTES*"
	   "*SUPPRESS-COMPILER-MESSAGES*")
  (:import-from "SI" "GET-SYSPROP" "PUT-SYSPROP" "REM-SYSPROP" "MACRO"
		"*COMPILER-CONSTANTS*" "REGISTER-GLOBAL" "CMP-ENV-REGISTER-MACROLET"
		"COMPILER-LET"))

(in-package "COMPILER")

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; COMPILER STRUCTURES
;;;

;;;
;;; REF OBJECT
;;;
;;; Base object for functions, variables and statements. We use it to
;;; keep track of references to objects, how many times the object is
;;; referenced, by whom, and whether the references cross some closure
;;; boundaries.
;;;

(defstruct (ref (:print-object print-ref))
  name			;;; Identifier of reference.
  (ref 0 :type fixnum)	;;; Number of references.
  ref-ccb		;;; Cross closure reference.
			;;; During Pass1, T or NIL.
			;;; During Pass2, the index into the closure env
  ref-clb		;;; Cross local function reference.
			;;; During Pass1, T or NIL.
			;;; During Pass2, the lex-address for the
			;;; block id, or NIL.
  read-nodes		;;; Nodes (c1forms) in which the reference occurs
)

(deftype OBJECT () `(not (or fixnum character float)))

(defstruct (var (:include ref) (:constructor %make-var) (:print-object print-var))
;  name		;;; Variable name.
;  (ref 0 :type fixnum)
		;;; Number of references to the variable (-1 means IGNORE).
;  ref-ccb	;;; Cross closure reference: T or NIL.
;  ref-clb	;;; Cross local function reference: T or NIL.
;  read-nodes	;;; Nodes (c1forms) in which the reference occurs
  set-nodes	;;; Nodes in which the variable is modified
  kind		;;; One of LEXICAL, CLOSURE, SPECIAL, GLOBAL, :OBJECT, :FIXNUM,
  		;;; :CHAR, :DOUBLE, :FLOAT, or REPLACED (used for
		;;; LET variables).
  (function *current-function*)
		;;; For local variables, in which function it was created.
		;;; For global variables, it doesn't have a meaning.
  (functions-setting nil)
  (functions-reading nil)
		;;; Functions in which the variable has been modified or read.
  (loc 'OBJECT)	;;; During Pass 1: indicates whether the variable can
		;;; be allocated on the c-stack: OBJECT means
		;;; the variable is declared as OBJECT, and CLB means
		;;; the variable is referenced across Level Boundary and thus
		;;; cannot be allocated on the C stack.  Note that OBJECT is
		;;; set during variable binding and CLB is set when the
		;;; variable is used later, and therefore CLB may supersede
		;;; OBJECT.
		;;; During Pass 2:
  		;;; For REPLACED: the actual location of the variable.
  		;;; For :FIXNUM, :CHAR, :FLOAT, :DOUBLE, :OBJECT:
  		;;;   the cvar for the C variable that holds the value.
  		;;; For LEXICAL or CLOSURE: the frame-relative address for
		;;; the variable in the form of a cons '(lex-levl . lex-ndx)
		;;;	lex-levl is the level of lexical environment
		;;;	lex-ndx is the index within the array for this env.
		;;; For SPECIAL and GLOBAL: the vv-index for variable name.
  (type t)	;;; Type of the variable.
  (index -1)    ;;; position in *vars*. Used by similar.
  (ignorable nil) ;;; Whether there was an IGNORABLE/IGNORE declaration
  )

;;; A function may be compiled into a CFUN, CCLOSURE or CCLOSURE+LISP_CLOSURE
;;; Here are examples of function FOO for the 3 cases:
;;; 1.  (flet ((foo () (bar))) (foo))		CFUN
;;; 2.  (flet ((foo () (bar))) #'foo)		CFUN+LISP_CFUN
;;; 3.  (flet ((foo () x)) #'(lambda () (foo))) CCLOSURE
;;; 4.  (flet ((foo () x)) #'foo)		CCLOSURE+LISP_CLOSURE

;;; A function can be referred across a ccb without being a closure, e.g:
;;;   (flet ((foo () (bar))) #'(lambda () (foo)))
;;;   [the lambda also need not be a closure]
;;; and it can be a closure without being referred across ccb, e.g.:
;;;   (flet ((foo () x)) #'foo)  [ is this a mistake in local-function-ref?]
;;; Here instead the lambda must be a closure, but no closure is needed for foo
;;;   (flet ((foo () x)) #'(lambda () (foo)))
;;; So we use two separate fields: ref-ccb and closure.
;;; A CCLOSURE must be created for a function when:
;;; 1. it appears within a FUNCTION construct and
;;; 2. it uses some ccb references (directly or indirectly).
;;; ref-ccb corresponds to the first condition, i.e. function is referred
;;;   across CCB. It is computed during Pass 1. A value of 'RETURNED means
;;;   that it is immediately within FUNCTION.
;;; closure corresponds to second condition and is computed in Pass 2 by
;;;   looking at the info-referred-vars and info-local-referred of its body.

;;; A LISP_CFUN or LISP_CLOSURE must be created when the function is returned.
;;; The LISP funob may then be referred locally or across LB or CB:
;;;     (flet ((foo (z) (bar z))) (list #'foo)))
;;;     (flet ((foo (z) z)) (flet ((bar () #'foo)) (bar)))
;;;     (flet ((foo (z) (bar z))) #'(lambda () #'foo)))
;;; therefore we need field funob.

(defstruct (fun (:include ref))
;  name			;;; Function name.
;  (ref 0 :type fixnum)	;;; Number of references.
			;;; During Pass1, T or NIL.
			;;; During Pass2, the vs-address for the
			;;; function closure, or NIL.
;  ref-ccb		;;; Cross closure reference.
 			;;; During Pass1, T or NIL, depending on whether a
			;;; function object will be built.
			;;; During Pass2, the vs-address for the function
			;;; closure, or NIL.
;  ref-clb		;;; Unused.
;  read-nodes		;;; Nodes (c1forms) in which the reference occurs
  cfun			;;; The cfun for the function.
  (level 0)		;;; Level of lexical nesting for a function.
  (env 0)     		;;; Size of env of closure.
  (global nil)		;;; Global lisp function.
  (exported nil)	;;; Its C name can be seen outside the module.
  (no-entry nil)	;;; NIL if declared as C-LOCAL. Then we create no
			;;; function object and the C function is called
			;;; directly
  (shares-with nil)	;;; T if this function shares the C code with another one.
			;;; In that case we need not emit this one.
  closure		;;; During Pass2, T if env is used inside the function
  var			;;; the variable holding the funob
  description		;;; Text for the object, in case NAME == NIL.
  lambda		;;; Lambda c1-form for this function.
  (minarg 0)		;;; Min. number arguments that the function receives.
  (maxarg call-arguments-limit)
			;;; Max. number arguments that the function receives.
  (parent *current-function*)
			;;; Parent function, NIL if global.
  (local-vars nil)	;;; List of local variables created here.
  (referred-vars nil)	;;; List of external variables referenced here.
  (referred-funs nil)	;;; List of external functions called in this one.
			;;; We only register direct calls, not calls via object.
  (child-funs nil)	;;; List of local functions defined here.
  (debug 0)		;;; Debug quality
  (file (car ext:*source-location*))
			;;; Source file or NIL
  (file-position (or (cdr ext:*source-location*) *compile-file-position*))
			;;; Top-level form number in source file
  )

(defstruct (blk (:include ref))
;  name			;;; Block name.
;  (ref 0 :type fixnum)	;;; Number of references.
;  ref-ccb		;;; Cross closure reference.
			;;; During Pass1, T or NIL.
			;;; During Pass2, the ccb-lex for the
			;;; block id, or NIL.
;  ref-clb		;;; Cross local function reference.
			;;; During Pass1, T or NIL.
			;;; During Pass2, the lex-address for the
			;;; block id, or NIL.
;  read-nodes		;;; Nodes (c1forms) in which the reference occurs
  exit			;;; Where to return.  A label.
  destination		;;; Where the value of the block to go.
  var			;;; Variable containing the block ID.
  (type 'NIL)		;;; Estimated type.
  )

(defstruct (tag (:include ref))
;  name			;;; Tag name.
;  (ref 0 :type fixnum)	;;; Number of references.
;  ref-ccb		;;; Cross closure reference.
			;;; During Pass1, T or NIL.
;  ref-clb		;;; Cross local function reference.
			;;; During Pass1, T or NIL.
;  read-nodes		;;; Nodes (c1forms) in which the reference occurs
  label			;;; Where to jump: a label.
  unwind-exit		;;; Where to unwind-no-exit.
  var			;;; Variable containing frame ID.
  index			;;; An integer denoting the label.
  )

(defstruct (info)
  (local-vars nil)	;;; List of var-objects created directly in the form.
  (type t)		;;; Type of the form.
  (sp-change nil)	;;; Whether execution of the form may change
			;;; the value of a special variable.
  (volatile nil)	;;; whether there is a possible setjmp. Beppe
  )

(defstruct (inline-info)
  name			;;; Function name
  arg-rep-types		;;; List of representation types for the arguments
  return-rep-type	;;; Representation type for the output
  arg-types		;;; List of lisp types for the arguments
  return-type		;;; Lisp type for the output
  exact-return-type	;;; Only use this expansion when the output is
			;;; declared to have a subtype of RETURN-TYPE
  expansion		;;; C template containing the expansion
  one-liner		;;; Whether the expansion spans more than one line
)

;;;
;;; VARIABLES
;;;

;;; --cmpinline.lsp--
;;;
;;; Empty info struct
;;;
(defvar *info* (make-info))

(defvar *inline-functions* nil)
(defvar *inline-blocks* 0)
;;; *inline-functions* holds:
;;;	(...( function-name . inline-info )...)
;;;
;;; *inline-blocks* holds the number of C blocks opened for declaring
;;; temporaries for intermediate results of the evaluation of inlined
;;; function calls.

;;; --cmputil.lsp--
;;;
;;; Variables and constants for error handling
;;;
(defvar *current-form* '|compiler preprocess|)
(defvar *current-toplevel-form* '|compiler preprocess|)
(defvar *current-c2form* nil)
(defvar *compile-file-position* -1)
(defvar *first-error* t)
(defconstant *cmperr-tag* (cons nil nil))

(defvar *active-handlers* nil)
(defvar *active-protection* nil)
(defvar *pending-actions* nil)

(defvar *compiler-conditions* '()
  "This variable determines whether conditions are printed or just accumulated.")

(defvar *compile-print* nil
  "This variable controls whether the compiler displays messages about
each form it processes. The default value is NIL.")

(defvar *compile-verbose* nil
  "This variable controls whether the compiler should display messages about its
progress. The default value is T.")

(defvar *suppress-compiler-messages* 'compiler-debug-note
  "A type denoting which compiler messages and conditions are _not_ displayed.")

(defvar *suppress-compiler-notes* nil) ; Deprecated
(defvar *suppress-compiler-warnings* nil) ; Deprecated

(defvar *compiler-break-enable* nil)

(defvar *compiler-in-use* nil)
(defvar *compiler-input*)
(defvar *compiler-output1*)
(defvar *compiler-output2*)

;;; --cmpcbk.lsp--
;;;
;;; List of callbacks to be generated
;;;
(defvar *callbacks* nil)

;;; --cmpcall.lsp--
;;;
;;; Whether to use linking calls.
;;;
(defvar *compile-to-linking-call* t)
(defvar *compiler-declared-globals*)

;;; --cmpenv.lsp--
;;;
;;; These default settings are equivalent to (optimize (speed 3) (space 0) (safety 2))
;;;
(defvar *safety* 2)
(defvar *speed* 3)
(defvar *space* 0)
(defvar *debug* 0)

;;; Emit automatic CHECK-TYPE forms for function arguments in lambda forms.
(defvar *automatic-check-type-in-lambda* t)

;;;
;;; Compiled code uses the following kinds of variables:
;;; 1. Vi, declared explicitely, either unboxed or not (*lcl*, next-lcl)
;;; 2. Ti, declared collectively, of type object, may be reused (*temp*, next-temp)
;;; 4. lexi[j], for lexical variables in local functions
;;; 5. CLVi, for lexical variables in closures

(defvar *lcl* 0)		; number of local variables

(defvar *temp* 0)		; number of temporary variables
(defvar *max-temp* 0)		; maximum *temp* reached

(defvar *level* 0)		; nesting level for local functions

(defvar *lex* 0)		; number of lexical variables in local functions
(defvar *max-lex* 0)		; maximum *lex* reached

(defvar *env* 0)		; number of variables in current form
(defvar *max-env* 0)		; maximum *env* in whole function
(defvar *env-lvl* 0)		; number of levels of environments
(defvar *aux-closure* nil)	; stack allocated closure needed for indirect calls

(defvar *next-cmacro* 0)	; holds the last cmacro number used.
(defvar *next-cfun* 0)		; holds the last cfun used.

(defvar *debug-fun* 0)		; Level of debugging of functions

;;;
;;; *tail-recursion-info* holds NIL, if tail recursion is impossible.
;;; If possible, *tail-recursion-info* holds
;;	( c1-lambda-form  required-arg .... required-arg ),
;;; where each required-arg is a var-object.
;;;
(defvar *tail-recursion-info* nil)

;;;
;;; *function-declarations* holds :
;;	(... ( { function-name | fun-object } arg-types return-type ) ...)
;;; Function declarations for global functions are ASSOCed by function names,
;;; whereas those for local functions are ASSOCed by function objects.
;;;
;;; The valid argment type declaration is:
;;	( {type}* [ &optional {type}* ] [ &rest type ] [ &key {type}* ] )
;;; though &optional, &rest, and &key return types are simply ignored.
;;;
(defvar *function-declarations* nil)
(defvar *allow-c-local-declaration* t)
(defvar *notinline* nil)

;;; --cmpexit.lsp--
;;;
;;; *last-label* holds the label# of the last used label.
;;; *exit* holds an 'exit', which is
;;	( label# . ref-flag ) or one of RETURNs (i.e. RETURN, RETURN-FIXNUM,
;;	RETURN-CHARACTER, RETURN-DOUBLE-FLOAT, RETURN-SINGLE-FLOAT, or
;;	RETURN-OBJECT).
;;; *unwind-exit* holds a list consisting of:
;;	( label# . ref-flag ), one of RETURNs, TAIL-RECURSION-MARK, FRAME,
;;	JUMP, BDS-BIND (each pushed for a single special binding), or a
;;	LCL (which holds the bind stack pointer used to unbind).
;;;
(defvar *last-label* 0)
(defvar *exit*)
(defvar *unwind-exit*)

(defvar *current-function* nil)

(defvar *cmp-env* (cons nil nil)
"The compiler environment consists of a pair or cons of two
lists, one containing variable records, the other one macro and
function recors:

variable-record = (:block block-name) |
                  (:tag ({tag-name}*)) |
                  (:function function-name) |
                  (var-name {:special | nil} bound-p) |
                  (symbol si::symbol-macro macro-function) |
                  CB | LB | UNWIND-PROTECT
macro-record =	(function-name function) |
                (macro-name si::macro macro-function)
                CB | LB | UNWIND-PROTECT

A *-NAME is a symbol. A TAG-ID is either a symbol or a number. A
MACRO-FUNCTION is a function that provides us with the expansion
for that local macro or symbol macro. BOUND-P is true when the
variable has been bound by an enclosing form, while it is NIL if
the variable-record corresponds just to a special declaration.
CB, LB and UNWIND-PROTECT are only used by the C compiler and
they denote closure, lexical environment and unwind-protect
boundaries. Note that compared with the bytecodes compiler, these
records contain an additional variable, block, tag or function
object at the end.")

;;; --cmplog.lsp--
;;;
;;; Destination of output of different forms. See cmploc.lsp for types
;;; of destinations.
;;;
(defvar *destination*)

;;; --cmpmain.lsp--
;;;
;;; Do we debug the compiler? Then we need files not to be deleted.

(defvar *debug-compiler* nil)
(defvar *delete-files* t)
(defvar *files-to-be-deleted* '())

;;; This is copied into each .h file generated, EXCEPT for system-p calls.
;;; The constant string *include-string* is the content of file "ecl.h".
;;; Here we use just a placeholder: it will be replaced with sed.
(defvar *cmpinclude* "<ecl/ecl-cmp.h>")

(defvar *cc* "@ECL_CC@"
"This variable controls how the C compiler is invoked by ECL.
The default value is \"cc -I. -I/usr/local/include/\".
The second -I option names the directory where the file ECL.h has been installed.
One can set the variable appropriately adding for instance flags which the 
C compiler may need to exploit special hardware features (e.g. a floating point
coprocessor).")

(defvar *ld* "@ECL_CC@"
"This variable controls the linker which is used by ECL.")

(defvar *cc-flags* "@CPPFLAGS@ @CFLAGS@ @ECL_CFLAGS@")

(defvar *cc-optimize* #-msvc "-O"
                      #+msvc "@CFLAGS_OPTIMIZE@")

(defvar *ld-format* #-msvc "~A -o ~S -L~S ~{~S ~} ~@[~S~]~{ '~A'~} ~A"
                    #+msvc "~A -Fe~S~* ~{~S ~} ~@[~S~]~{ '~A'~} ~A")

(defvar *cc-format* #-msvc "~A \"-I~A\" ~A ~:[~*~;~A~] -w -c \"~A\" -o \"~A\"~{ '~A'~}"
                    #+msvc "~A -I\"~A\" ~A ~:[~*~;~A~] -w -c \"~A\" -Fo\"~A\"~{ '~A'~}")

#-dlopen
(defvar *ld-flags* "@LDFLAGS@ -lecl @CORE_LIBS@ @FASL_LIBS@ @LIBS@")
#+dlopen
(defvar *ld-flags* #-msvc "@LDFLAGS@ -lecl @FASL_LIBS@ @LIBS@"
                   #+msvc "@LDFLAGS@ ecl.lib @CLIBS@")
#+dlopen
(defvar *ld-shared-flags* #-msvc "@SHARED_LDFLAGS@ @LDFLAGS@ -lecl @FASL_LIBS@ @LIBS@"
                          #+msvc "@SHARED_LDFLAGS@ @LDFLAGS@ ecl.lib @CLIBS@")
#+dlopen
(defvar *ld-bundle-flags* #-msvc "@BUNDLE_LDFLAGS@ @LDFLAGS@ -lecl @FASL_LIBS@ @LIBS@"
                          #+msvc "@BUNDLE_LDFLAGS@ @LDFLAGS@ ecl.lib @CLIBS@")

(defvar *user-ld-flags* '()
"Flags and options to be passed to the linker when building FASL, shared libraries
and standalone programs. It is not required to surround values with quotes or use
slashes before special characters.")

(defvar *user-cc-flags* '()
"Flags and options to be passed to the C compiler when building FASL, shared libraries
and standalone programs. It is not required to surround values with quotes or use
slashes before special characters.")

(defvar +shared-library-prefix+ "@SHAREDPREFIX@")
(defvar +shared-library-extension+ "@SHAREDEXT@")
(defvar +shared-library-format+ "@SHAREDPREFIX@~a.@SHAREDEXT@")
(defvar +static-library-prefix+ "@LIBPREFIX@")
(defvar +static-library-extension+ "@LIBEXT@")
(defvar +static-library-format+ "@LIBPREFIX@~a.@LIBEXT@")
(defvar +object-file-extension+ "@OBJEXT@")
(defvar +executable-file-format+ "~a@EXEEXT@")

(defvar *ecl-include-directory* @includedir\@)
(defvar *ecl-library-directory* @libdir\@)

(defvar *ld-rpath*
  (let ((x "@ECL_LDRPATH@"))
    (and (plusp (length x))
         (format nil x *ecl-library-directory*))))

;;;
;;; Compiler program and flags.
;;;

;;; --cmptop.lsp--
;;;
(defvar *do-type-propagation* nil
  "Flag for switching on the type propagation phase. Use with care, experimental.")

(defvar *compiler-phase* nil)

(defvar *volatile*)
(defvar *setjmps* 0)

(defvar *compile-toplevel* T
  "Holds NIL or T depending on whether we are compiling a toplevel form.")

(defvar *clines-string-list* '()
  "List of strings containing C/C++ statements which are directly inserted
in the translated C/C++ file. Notice that it is unspecified where these
lines are inserted, but the order is preserved")

(defvar *compile-time-too* nil)
(defvar *not-compile-time* nil)

(defvar *permanent-data* nil)		; detemines whether we use *permanent-objects*
					; or *temporary-objects*
(defvar *permanent-objects* nil)	; holds { ( object (VV vv-index) ) }*
(defvar *temporary-objects* nil)	; holds { ( object (VV vv-index) ) }*
(defvar *load-objects* nil)		; hash with association object -> vv-location
(defvar *load-time-values* nil)		; holds { ( vv-index form ) }*,
;;;  where each vv-index should be given an object before
;;;  defining the current function during loading process.

(defvar *use-static-constants-p* nil)   ; T/NIL flag to determine whether one may
                                        ; generate lisp constant values as C structs
(defvar *static-constants* nil)		; constants that can be built as C values
                                        ; holds { ( object c-variable constant ) }*

(defvar *compiler-constants* nil)	; a vector with all constants
					; only used in COMPILE

(defvar *proclaim-fixed-args* nil)	; proclaim automatically functions
					; with fixed number of arguments.
					; watch out for multiple values.

(defvar *global-var-objects* nil)	; var objects for global/special vars
(defvar *global-vars* nil)		; variables declared special
(defvar *global-funs* nil)		; holds	{ fun }*
(defvar *global-cfuns-array* nil)	; holds	{ fun }*
(defvar *linking-calls* nil)		; holds { ( global-fun-name fun symbol c-fun-name var-name ) }*
(defvar *local-funs* nil)		; holds { fun }*
(defvar *top-level-forms* nil)		; holds { top-level-form }*
(defvar *make-forms* nil)		; holds { top-level-form }*

;;;
;;;     top-level-form:
;;;	  ( 'DEFUN'     fun-name cfun lambda-expr doc-vv sp )
;;;	| ( 'DEFMACRO'  macro-name cfun lambda-expr doc-vv sp )
;;;	| ( 'ORDINARY'  expr )
;;;	| ( 'DECLARE'   var-name-vv )
;;;	| ( 'DEFVAR'	var-name-vv expr doc-vv )
;;;	| ( 'CLINES'	string* )
;;;	| ( 'LOAD-TIME-VALUE' vv )

(defvar *reservations* nil)
(defvar *reservation-cmacro* nil)

;;; *reservations* holds (... ( cmacro . value ) ...).
;;; *reservation-cmacro* holds the cmacro current used as vs reservation.

;;; *global-entries* holds (... ( fname cfun return-types arg-type ) ...).
(defvar *global-entries* nil)

(defvar *self-destructing-fasl* '()
"A value T means that, when a FASL module is being unloaded (for
instance during garbage collection), the associated file will be
deleted. We need this for #'COMPILE because windows DLLs cannot
be deleted if they have been opened with LoadLibrary.")

(defvar *undefined-vars* nil)