From 5226e2890df9a25bd1d33514ff67539da7794905 Mon Sep 17 00:00:00 2001
From: admin <admin@vouivredigital.com>
Date: Fri, 22 Sep 2023 17:49:13 +0900
Subject: [PATCH] Copy files from
 guile-3.0.9.22-1ae50-dirty/module/language/scheme/

---
 compile-tree-il.scm   |  33 ++
 decompile-tree-il.scm | 796 ++++++++++++++++++++++++++++++++++++++++++
 spec.scm              |  63 ++++
 3 files changed, 892 insertions(+)
 create mode 100644 compile-tree-il.scm
 create mode 100644 decompile-tree-il.scm
 create mode 100644 spec.scm

diff --git a/compile-tree-il.scm b/compile-tree-il.scm
new file mode 100644
index 0000000..d9d2d7a
--- /dev/null
+++ b/compile-tree-il.scm
@@ -0,0 +1,33 @@
+;;; Guile Scheme specification
+
+;; Copyright (C) 2001, 2009, 2010 Free Software Foundation, Inc.
+
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 3 of the License, or (at your option) any later version.
+;;;; 
+;;;; This library is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;;; Lesser General Public License for more details.
+;;;; 
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+;;; Code:
+
+(define-module (language scheme compile-tree-il)
+  #:use-module (language tree-il)
+  #:export (compile-tree-il))
+
+;;; environment := MODULE
+
+(define (compile-tree-il x e opts)
+  (save-module-excursion
+   (lambda ()
+     (set-current-module e)
+     (let* ((x (macroexpand x 'c '(compile load eval)))
+            (cenv (current-module)))
+       (values x cenv cenv)))))
diff --git a/decompile-tree-il.scm b/decompile-tree-il.scm
new file mode 100644
index 0000000..99edee4
--- /dev/null
+++ b/decompile-tree-il.scm
@@ -0,0 +1,796 @@
+;;; Guile VM code converters
+
+;; Copyright (C) 2001, 2009, 2012, 2013 Free Software Foundation, Inc.
+
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 3 of the License, or (at your option) any later version.
+;;;; 
+;;;; This library is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;;; Lesser General Public License for more details.
+;;;; 
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+;;; Code:
+
+(define-module (language scheme decompile-tree-il)
+  #:use-module (language tree-il)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 receive)
+  #:use-module (ice-9 vlist)
+  #:use-module (ice-9 match)
+  #:use-module (system base syntax)
+  #:export (decompile-tree-il))
+
+(define (decompile-tree-il e env opts)
+  (apply do-decompile e env opts))
+
+(define* (do-decompile e env
+                       #:key
+                       (use-derived-syntax? #t)
+                       (avoid-lambda? #t)
+                       (use-case? #t)
+                       (strip-numeric-suffixes? #f)
+                       #:allow-other-keys)
+
+  (receive (output-name-table occurrence-count-table)
+      (choose-output-names e use-derived-syntax? strip-numeric-suffixes?)
+
+    (define (output-name s)      (hashq-ref output-name-table s))
+    (define (occurrence-count s) (hashq-ref occurrence-count-table s))
+
+    (define (const x) (lambda (_) x))
+    (define (atom? x) (not (or (pair? x) (vector? x))))
+
+    (define (build-void) '(if #f #f))
+
+    (define (build-begin es)
+      (match es
+        (() (build-void))
+        ((e) e)
+        (_ `(begin ,@es))))
+
+    (define (build-lambda-body e)
+      (match e
+        (('let () body ...) body)
+        (('begin es ...) es)
+        (_ (list e))))
+
+    (define (build-begin-body e)
+      (match e
+        (('begin es ...) es)
+        (_ (list e))))
+
+    (define (build-define name e)
+      (match e
+        ((? (const avoid-lambda?)
+            ('lambda formals body ...))
+         `(define (,name ,@formals) ,@body))
+        ((? (const avoid-lambda?)
+            ('lambda* formals body ...))
+         `(define* (,name ,@formals) ,@body))
+        (_ `(define ,name ,e))))
+
+    (define (build-let names vals body)
+      (match `(let ,(map list names vals)
+                ,@(build-lambda-body body))
+        ((_ () e) e)
+        ((_ (b) ('let* (bs ...) body ...))
+         `(let* (,b ,@bs) ,@body))
+        ((? (const use-derived-syntax?)
+            (_ (b1) ('let (b2) body ...)))
+         `(let* (,b1 ,b2) ,@body))
+        (e e)))
+
+    (define (build-letrec in-order? names vals body)
+      (match `(,(if in-order? 'letrec* 'letrec)
+               ,(map list names vals)
+               ,@(build-lambda-body body))
+        ((_ () e) e)
+        ((_ () body ...) `(let () ,@body))
+        ((_ ((name ('lambda (formals ...) body ...)))
+            (name args ...))
+         (=> failure)
+         (if (= (length formals) (length args))
+             `(let ,name ,(map list formals args) ,@body)
+             (failure)))
+        ((? (const avoid-lambda?)
+            ('letrec* _ body ...))
+         `(let ()
+            ,@(map build-define names vals)
+            ,@body))
+        (e e)))
+
+    (define (build-if test consequent alternate)
+      (match alternate
+        (('if #f _) `(if ,test ,consequent))
+        (_ `(if ,test ,consequent ,alternate))))
+
+    (define (build-and xs)
+      (match xs
+        (() #t)
+        ((x) x)
+        (_ `(and ,@xs))))
+
+    (define (build-or xs)
+      (match xs
+        (() #f)
+        ((x) x)
+        (_ `(or ,@xs))))
+
+    (define (case-test-var test)
+      (match test
+        (('memv (? atom? v) ('quote (datums ...)))
+         v)
+        (('eqv? (? atom? v) ('quote datum))
+         v)
+        (_ #f)))
+
+    (define (test->datums v test)
+      (match (cons v test)
+        ((v 'memv v ('quote (xs ...)))
+         xs)
+        ((v 'eqv? v ('quote x))
+         (list x))
+        (_ #f)))
+
+    (define (build-else-tail e)
+      (match e
+        (('if #f _) '())
+        (('and xs ... x) `((,(build-and xs) ,@(build-begin-body x))
+                           (else #f)))
+        (_ `((else ,@(build-begin-body e))))))
+
+    (define (build-cond-else-tail e)
+      (match e
+        (('cond clauses ...) clauses)
+        (_ (build-else-tail e))))
+
+    (define (build-case-else-tail v e)
+      (match (cons v e)
+        ((v 'case v clauses ...)
+         clauses)
+        ((v 'if ('memv v ('quote (xs ...))) consequent . alternate*)
+         `((,xs ,@(build-begin-body consequent))
+           ,@(build-case-else-tail v (build-begin alternate*))))
+        ((v 'if ('eqv? v ('quote x)) consequent . alternate*)
+         `(((,x) ,@(build-begin-body consequent))
+           ,@(build-case-else-tail v (build-begin alternate*))))
+        (_ (build-else-tail e))))
+
+    (define (clauses+tail clauses)
+      (match clauses
+        ((cs ... (and c ('else . _))) (values cs (list c)))
+        (_ (values clauses '()))))
+
+    (define (build-cond tests consequents alternate)
+      (case (length tests)
+        ((0) alternate)
+        ((1) (build-if (car tests) (car consequents) alternate))
+        (else `(cond ,@(map (lambda (test consequent)
+                              `(,test ,@(build-begin-body consequent)))
+                            tests consequents)
+                     ,@(build-cond-else-tail alternate)))))
+
+    (define (build-cond-or-case tests consequents alternate)
+      (if (not use-case?)
+          (build-cond tests consequents alternate)
+          (let* ((v (and (not (null? tests))
+                         (case-test-var (car tests))))
+                 (datum-lists (take-while identity
+                                          (map (cut test->datums v <>)
+                                               tests)))
+                 (n (length datum-lists))
+                 (tail (build-case-else-tail v (build-cond
+                                                (drop tests n)
+                                                (drop consequents n)
+                                                alternate))))
+            (receive (clauses tail) (clauses+tail tail)
+              (let ((n (+ n (length clauses)))
+                    (datum-lists (append datum-lists
+                                         (map car clauses)))
+                    (consequents (append consequents
+                                         (map build-begin
+                                              (map cdr clauses)))))
+                (if (< n 2)
+                    (build-cond tests consequents alternate)
+                    `(case ,v
+                       ,@(map cons datum-lists (map build-begin-body
+                                                    (take consequents n)))
+                       ,@tail)))))))
+
+    (define (recurse e)
+
+      (define (recurse-body e)
+        (build-lambda-body (recurse e)))
+
+      (record-case e
+        ((<void>)
+         (build-void))
+
+        ((<const> exp)
+         (if (and (self-evaluating? exp) (not (vector? exp)))
+             exp
+             `(quote ,exp)))
+
+        ((<seq> head tail)
+         (build-begin (cons (recurse head)
+                            (build-begin-body
+                             (recurse tail)))))
+
+        ((<call> proc args)
+         (match `(,(recurse proc) ,@(map recurse args))
+           ((('lambda (formals ...) body ...) args ...)
+            (=> failure)
+            (if (= (length formals) (length args))
+                (build-let formals args (build-begin body))
+                (failure)))
+           (e e)))
+
+        ((<primcall> name args)
+         `(,name ,@(map recurse args)))
+
+        ((<primitive-ref> name)
+         name)
+
+        ((<lexical-ref> gensym)
+         (output-name gensym))
+
+        ((<lexical-set> gensym exp)
+         `(set! ,(output-name gensym) ,(recurse exp)))
+
+        ((<module-ref> mod name public?)
+         `(,(if public? '@ '@@) ,mod ,name))
+
+        ((<module-set> mod name public? exp)
+         `(set! (,(if public? '@ '@@) ,mod ,name) ,(recurse exp)))
+
+        ((<toplevel-ref> name)
+         name)
+
+        ((<toplevel-set> name exp)
+         `(set! ,name ,(recurse exp)))
+
+        ((<toplevel-define> name exp)
+         (build-define name (recurse exp)))
+
+        ((<lambda> meta body)
+         (if body
+             (let ((body (recurse body))
+                   (doc (assq-ref meta 'documentation)))
+               (if (not doc)
+                   body
+                   (match body
+                     (('lambda formals body ...)
+                      `(lambda ,formals ,doc ,@body))
+                     (('lambda* formals body ...)
+                      `(lambda* ,formals ,doc ,@body))
+                     (('case-lambda (formals body ...) clauses ...)
+                      `(case-lambda (,formals ,doc ,@body) ,@clauses))
+                     (('case-lambda* (formals body ...) clauses ...)
+                      `(case-lambda* (,formals ,doc ,@body) ,@clauses))
+                     (e e))))
+             '(case-lambda)))
+
+        ((<lambda-case> req opt rest kw inits gensyms body alternate)
+         (let ((names (map output-name gensyms)))
+           (cond
+            ((and (not opt) (not kw) (not alternate))
+             `(lambda ,(if rest (apply cons* names) names)
+                ,@(recurse-body body)))
+            ((and (not opt) (not kw))
+             (let ((alt-expansion (recurse alternate))
+                   (formals (if rest (apply cons* names) names)))
+               (case (car alt-expansion)
+                 ((lambda)
+                  `(case-lambda (,formals ,@(recurse-body body))
+                                ,(cdr alt-expansion)))
+                 ((lambda*)
+                  `(case-lambda* (,formals ,@(recurse-body body))
+                                 ,(cdr alt-expansion)))
+                 ((case-lambda)
+                  `(case-lambda (,formals ,@(recurse-body body))
+                                ,@(cdr alt-expansion)))
+                 ((case-lambda*)
+                  `(case-lambda* (,formals ,@(recurse-body body))
+                                 ,@(cdr alt-expansion))))))
+            (else
+             (let* ((alt-expansion (and alternate (recurse alternate)))
+                    (nreq (length req))
+                    (nopt (if opt (length opt) 0))
+                    (restargs (if rest (list-ref names (+ nreq nopt)) '()))
+                    (reqargs (list-head names nreq))
+                    (optargs (if opt
+                                 `(#:optional
+                                   ,@(map list
+                                          (list-head (list-tail names nreq) nopt)
+                                          (map recurse
+                                               (list-head inits nopt))))
+                                 '()))
+                    (kwargs (if kw
+                                `(#:key
+                                  ,@(map list
+                                         (map output-name (map caddr (cdr kw)))
+                                         (map recurse
+                                              (list-tail inits nopt))
+                                         (map car (cdr kw)))
+                                  ,@(if (car kw)
+                                        '(#:allow-other-keys)
+                                        '()))
+                                '()))
+                    (formals `(,@reqargs ,@optargs ,@kwargs . ,restargs)))
+               (if (not alt-expansion)
+                   `(lambda* ,formals ,@(recurse-body body))
+                   (case (car alt-expansion)
+                     ((lambda lambda*)
+                      `(case-lambda* (,formals ,@(recurse-body body))
+                                     ,(cdr alt-expansion)))
+                     ((case-lambda case-lambda*)
+                      `(case-lambda* (,formals ,@(recurse-body body))
+                                     ,@(cdr alt-expansion))))))))))
+
+        ((<conditional> test consequent alternate)
+         (define (simplify-test e)
+           (match e
+             (('if ('eqv? (? atom? v) ('quote a)) #t ('eqv? v ('quote b)))
+              `(memv ,v '(,a ,b)))
+             (('if ('eqv? (? atom? v) ('quote a)) #t ('memv v ('quote (bs ...))))
+              `(memv ,v '(,a ,@bs)))
+             (('case (? atom? v)
+                ((datum) #t) ...
+                ('else ('eqv? v ('quote last-datum))))
+              `(memv ,v '(,@datum ,last-datum)))
+             (_ e)))
+         (match `(if ,(simplify-test (recurse test))
+                     ,(recurse consequent)
+                     ,@(if (void? alternate) '()
+                           (list (recurse alternate))))
+           (('if test ('if ('and xs ...) consequent))
+            (build-if (build-and (cons test xs))
+                      consequent
+                      (build-void)))
+           ((? (const use-derived-syntax?)
+               ('if test1 ('if test2 consequent)))
+            (build-if (build-and (list test1 test2))
+                      consequent
+                      (build-void)))
+           (('if (? atom? x) x ('or ys ...))
+            (build-or (cons x ys)))
+           ((? (const use-derived-syntax?)
+               ('if (? atom? x) x y))
+            (build-or (list x y)))
+           (('if test consequent)
+            `(if ,test ,consequent))
+           (('if test ('and xs ...) #f)
+            (build-and (cons test xs)))
+           ((? (const use-derived-syntax?)
+               ('if test consequent #f))
+            (build-and (list test consequent)))
+           ((? (const use-derived-syntax?)
+               ('if test1 consequent1
+                    ('if test2 consequent2 . alternate*)))
+            (build-cond-or-case (list test1 test2)
+                                (list consequent1 consequent2)
+                                (build-begin alternate*)))
+           (('if test consequent ('cond clauses ...))
+            `(cond (,test ,@(build-begin-body consequent))
+                   ,@clauses))
+           (('if ('memv (? atom? v) ('quote (xs ...))) consequent
+                 ('case v clauses ...))
+            `(case ,v (,xs ,@(build-begin-body consequent))
+                   ,@clauses))
+           (('if ('eqv? (? atom? v) ('quote x)) consequent
+                 ('case v clauses ...))
+            `(case ,v ((,x) ,@(build-begin-body consequent))
+                   ,@clauses))
+           (e e)))
+
+        ((<let> gensyms vals body)
+         (match (build-let (map output-name gensyms)
+                           (map recurse vals)
+                           (recurse body))
+           (('let ((v e)) ('or v xs ...))
+            (=> failure)
+            (if (and (not (null? gensyms))
+                     (= 3 (occurrence-count (car gensyms))))
+                `(or ,e ,@xs)
+                (failure)))
+           (('let ((v e)) ('case v clauses ...))
+            (=> failure)
+            (if (and (not (null? gensyms))
+                     ;; FIXME: This fails if any of the 'memv's were
+                     ;; optimized into multiple 'eqv?'s, because the
+                     ;; occurrence count will be higher than we expect.
+                     (= (occurrence-count (car gensyms))
+                        (1+ (length (clauses+tail clauses)))))
+                `(case ,e ,@clauses)
+                (failure)))
+           (e e)))
+
+        ((<letrec> in-order? gensyms vals body)
+         (build-letrec in-order?
+                       (map output-name gensyms)
+                       (map recurse vals)
+                       (recurse body)))
+
+        ((<fix> gensyms vals body)
+         ;; not a typo, we really do translate back to letrec. use letrec* since it
+         ;; doesn't matter, and the naive letrec* transformation does not require an
+         ;; inner let.
+         (build-letrec #t
+                       (map output-name gensyms)
+                       (map recurse vals)
+                       (recurse body)))
+
+        ((<let-values> exp body)
+         `(call-with-values (lambda () ,@(recurse-body exp))
+            ,(recurse (make-lambda #f '() body))))
+
+        ((<prompt> escape-only? tag body handler)
+         `(call-with-prompt
+           ,(recurse tag)
+           ,(if escape-only?
+                `(lambda () ,(recurse body))
+                (recurse body))
+           ,(recurse handler)))
+
+
+        ((<abort> tag args tail)
+         `(apply abort ,(recurse tag) ,@(map recurse args)
+                 ,(recurse tail)))))
+    (values (recurse e) env)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; Algorithm for choosing better variable names
+;; ============================================
+;;
+;; First we perform an analysis pass, collecting the following
+;; information:
+;;
+;; * For each gensym: how many occurrences will occur in the output?
+;;
+;; * For each gensym A: which gensyms does A conflict with?  Gensym A
+;;   and gensym B conflict if they have the same base name (usually the
+;;   same as the source name, but see below), and if giving them the
+;;   same name would cause a bad variable reference due to unintentional
+;;   variable capture.
+;;
+;; The occurrence counter is indexed by gensym and is global (within each
+;; invocation of the algorithm), implemented using a hash table.  We also
+;; keep a global mapping from gensym to source name as provided by the
+;; binding construct (we prefer not to trust the source names in the
+;; lexical ref or set).
+;;
+;; As we recurse down into lexical binding forms, we keep track of a
+;; mapping from base name to an ordered list of bindings, innermost
+;; first.  When we encounter a variable occurrence, we increment the
+;; counter, look up the base name (preferring not to trust the 'name' in
+;; the lexical ref or set), and then look up the bindings currently in
+;; effect for that base name.  Hopefully our gensym will be the first
+;; (innermost) binding.  If not, we register a conflict between the
+;; referenced gensym and the other bound gensyms with the same base name
+;; that shadow the binding we want.  These are simply the gensyms on the
+;; binding list that come before our gensym.
+;;
+;; Top-level bindings are treated specially.  Whenever top-level
+;; references are found, they conflict with every lexical binding
+;; currently in effect with the same base name.  They are guaranteed to
+;; be assigned to their source names.  For purposes of recording
+;; conflicts (which are normally keyed on gensyms) top-level identifiers
+;; are assigned a pseudo-gensym that is an interned pair of the form
+;; (top-level . <name>).  This allows them to be compared using 'eq?'
+;; like other gensyms.
+;;
+;; The base name is normally just the source name.  However, if the
+;; source name has a suffix of the form "-N" (where N is a positive
+;; integer without leading zeroes), then we strip that suffix (multiple
+;; times if necessary) to form the base name.  We must do this because
+;; we add suffixes of that form in order to resolve conflicts, and we
+;; must ensure that only identifiers with the same base name can
+;; possibly conflict with each other.
+;;
+;; XXX FIXME: Currently, primitives are treated exactly like top-level
+;; bindings.  This handles conflicting lexical bindings properly, but
+;; does _not_ handle the case where top-level bindings conflict with the
+;; needed primitives.
+;;
+;; Also note that this requires that 'choose-output-names' be kept in
+;; sync with 'tree-il->scheme'.  Primitives that are introduced by
+;; 'tree-il->scheme' must be anticipated by 'choose-output-name'.
+;;
+;; We also ensure that lexically-bound identifiers found in operator
+;; position will never be assigned one of the standard primitive names.
+;; This is needed because 'tree-il->scheme' recognizes primitive names
+;; in operator position and assumes that they have the standard
+;; bindings.
+;;
+;;
+;; How we assign an output name to each gensym
+;; ===========================================
+;;
+;; We process the gensyms in order of decreasing occurrence count, with
+;; each gensym choosing the best output name possible, as long as it
+;; isn't the same name as any of the previously-chosen output names of
+;; conflicting gensyms.
+;;
+
+
+;;
+;; 'choose-output-names' analyzes the top-level form e, chooses good
+;; variable names that are as close as possible to the source names,
+;; and returns two values:
+;;
+;;  * a hash table mapping gensym to output name
+;;  * a hash table mapping gensym to number of occurrences
+;;
+(define choose-output-names
+  (let ()
+    (define primitive?
+      ;; This is a list of primitives that 'tree-il->scheme' assumes
+      ;; will have the standard bindings when found in operator
+      ;; position.
+      (let* ((primitives '(if quote @ @@ set! define define*
+                              begin let let* letrec letrec*
+                              and or cond case
+                              lambda lambda* case-lambda case-lambda*
+                              apply call-with-values dynamic-wind
+                              with-fluids fluid-ref fluid-set!
+                              call-with-prompt abort memv eqv?))
+             (table (make-hash-table (length primitives))))
+        (for-each (cut hashq-set! table <> #t) primitives)
+        (lambda (name) (hashq-ref table name))))
+
+    ;; Repeatedly strip suffix of the form "-N", where N is a string
+    ;; that could be produced by number->string given a positive
+    ;; integer.  In other words, the first digit of N may not be 0.
+    (define compute-base-name
+      (let ((digits (string->char-set "0123456789")))
+        (define (base-name-string str)
+          (let ((i (string-skip-right str digits)))
+            (if (and i (< (1+ i) (string-length str))
+                     (eq? #\- (string-ref str i))
+                     (not (eq? #\0 (string-ref str (1+ i)))))
+                (base-name-string (substring str 0 i))
+                str)))
+        (lambda (sym)
+          (string->symbol (base-name-string (symbol->string sym))))))
+
+    ;; choose-output-names
+    (lambda (e use-derived-syntax? strip-numeric-suffixes?)
+
+      (define lexical-gensyms '())
+
+      (define top-level-intern!
+        (let ((table (make-hash-table)))
+          (lambda (name)
+            (let ((h (hashq-create-handle! table name #f)))
+              (or (cdr h) (begin (set-cdr! h (cons 'top-level name))
+                                 (cdr h)))))))
+      (define (top-level? s) (pair? s))
+      (define (top-level-name s) (cdr s))
+
+      (define occurrence-count-table (make-hash-table))
+      (define (occurrence-count s) (or (hashq-ref occurrence-count-table s) 0))
+      (define (increment-occurrence-count! s)
+        (let ((h (hashq-create-handle! occurrence-count-table s 0)))
+          (if (zero? (cdr h))
+              (set! lexical-gensyms (cons s lexical-gensyms)))
+          (set-cdr! h (1+ (cdr h)))))
+
+      (define base-name
+        (let ((table (make-hash-table)))
+          (lambda (name)
+            (let ((h (hashq-create-handle! table name #f)))
+              (or (cdr h) (begin (set-cdr! h (compute-base-name name))
+                                 (cdr h)))))))
+
+      (define source-name-table (make-hash-table))
+      (define (set-source-name! s name)
+        (if (not (top-level? s))
+            (let ((name (if strip-numeric-suffixes?
+                            (base-name name)
+                            name)))
+              (hashq-set! source-name-table s name))))
+      (define (source-name s)
+        (if (top-level? s)
+            (top-level-name s)
+            (hashq-ref source-name-table s)))
+
+      (define conflict-table (make-hash-table))
+      (define (conflicts s) (or (hashq-ref conflict-table s) '()))
+      (define (add-conflict! a b)
+        (define (add! a b)
+          (if (not (top-level? a))
+              (let ((h (hashq-create-handle! conflict-table a '())))
+                (if (not (memq b (cdr h)))
+                    (set-cdr! h (cons b (cdr h)))))))
+        (add! a b)
+        (add! b a))
+
+      (let recurse-with-bindings ((e e) (bindings vlist-null))
+        (let recurse ((e e))
+
+          ;; We call this whenever we encounter a top-level ref or set
+          (define (top-level name)
+            (let ((bname (base-name name)))
+              (let ((s (top-level-intern! name))
+                    (conflicts (vhash-foldq* cons '() bname bindings)))
+                (for-each (cut add-conflict! s <>) conflicts))))
+
+          ;; We call this whenever we encounter a primitive reference.
+          ;; We must also call it for every primitive that might be
+          ;; inserted by 'tree-il->scheme'.  It is okay to call this
+          ;; even when 'tree-il->scheme' will not insert the named
+          ;; primitive; the worst that will happen is for a lexical
+          ;; variable of the same name to be renamed unnecessarily.
+          (define (primitive name) (top-level name))
+
+          ;; We call this whenever we encounter a lexical ref or set.
+          (define (lexical s)
+            (increment-occurrence-count! s)
+            (let ((conflicts
+                   (take-while
+                    (lambda (s*) (not (eq? s s*)))
+                    (reverse! (vhash-foldq* cons
+                                            '()
+                                            (base-name (source-name s))
+                                            bindings)))))
+              (for-each (cut add-conflict! s <>) conflicts)))
+
+          (record-case e
+            ((<void>)  (primitive 'if)) ; (if #f #f)
+            ((<const>) (primitive 'quote))
+
+            ((<call> proc args)
+             (if (lexical-ref? proc)
+                 (let* ((gensym (lexical-ref-gensym proc))
+                        (name (source-name gensym)))
+                   ;; If the operator position contains a bare variable
+                   ;; reference with the same source name as a standard
+                   ;; primitive, we must ensure that it will be given a
+                   ;; different name, so that 'tree-il->scheme' will not
+                   ;; misinterpret the resulting expression.
+                   (if (primitive? name)
+                       (add-conflict! gensym (top-level-intern! name)))))
+             (recurse proc)
+             (for-each recurse args))
+
+            ((<primitive-ref> name) (primitive name))
+            ((<primcall> name args) (primitive name) (for-each recurse args))
+
+            ((<lexical-ref> gensym) (lexical gensym))
+            ((<lexical-set> gensym exp)
+             (primitive 'set!) (lexical gensym) (recurse exp))
+
+            ((<module-ref> public?) (primitive (if public? '@ '@@)))
+            ((<module-set> public? exp)
+             (primitive 'set!) (primitive (if public? '@ '@@)) (recurse exp))
+
+            ((<toplevel-ref> name) (top-level name))
+            ((<toplevel-set> name exp)
+             (primitive 'set!) (top-level name) (recurse exp))
+            ((<toplevel-define> name exp) (top-level name) (recurse exp))
+
+            ((<conditional> test consequent alternate)
+             (cond (use-derived-syntax?
+                    (primitive 'and) (primitive 'or)
+                    (primitive 'cond) (primitive 'case)
+                    (primitive 'else) (primitive '=>)))
+             (primitive 'if)
+             (recurse test) (recurse consequent) (recurse alternate))
+
+            ((<seq> head tail)
+             (primitive 'begin) (recurse head) (recurse tail))
+
+            ((<lambda> body)
+             (if body (recurse body) (primitive 'case-lambda)))
+
+            ((<lambda-case> req opt rest kw inits gensyms body alternate)
+             (primitive 'lambda)
+             (cond ((or opt kw alternate)
+                    (primitive 'lambda*)
+                    (primitive 'case-lambda)
+                    (primitive 'case-lambda*)))
+             (primitive 'let)
+             (if use-derived-syntax? (primitive 'let*))
+             (let* ((names (append req (or opt '()) (if rest (list rest) '())
+                                   (map cadr (if kw (cdr kw) '()))))
+                    (base-names (map base-name names))
+                    (body-bindings
+                     (fold vhash-consq bindings base-names gensyms)))
+               (for-each increment-occurrence-count! gensyms)
+               (for-each set-source-name! gensyms names)
+               (for-each recurse inits)
+               (recurse-with-bindings body body-bindings)
+               (if alternate (recurse alternate))))
+
+            ((<let> names gensyms vals body)
+             (primitive 'let)
+             (cond (use-derived-syntax? (primitive 'let*) (primitive 'or)))
+             (for-each increment-occurrence-count! gensyms)
+             (for-each set-source-name! gensyms names)
+             (for-each recurse vals)
+             (recurse-with-bindings
+              body (fold vhash-consq bindings (map base-name names) gensyms)))
+
+            ((<letrec> in-order? names gensyms vals body)
+             (primitive 'let)
+             (cond (use-derived-syntax? (primitive 'let*) (primitive 'or)))
+             (primitive (if in-order? 'letrec* 'letrec))
+             (for-each increment-occurrence-count! gensyms)
+             (for-each set-source-name! gensyms names)
+             (let* ((base-names (map base-name names))
+                    (bindings (fold vhash-consq bindings base-names gensyms)))
+               (for-each (cut recurse-with-bindings <> bindings) vals)
+               (recurse-with-bindings body bindings)))
+
+            ((<fix> names gensyms vals body)
+             (primitive 'let)
+             (primitive 'letrec*)
+             (cond (use-derived-syntax? (primitive 'let*) (primitive 'or)))
+             (for-each increment-occurrence-count! gensyms)
+             (for-each set-source-name! gensyms names)
+             (let* ((base-names (map base-name names))
+                    (bindings (fold vhash-consq bindings base-names gensyms)))
+               (for-each (cut recurse-with-bindings <> bindings) vals)
+               (recurse-with-bindings body bindings)))
+
+            ((<let-values> exp body)
+             (primitive 'call-with-values)
+             (recurse exp) (recurse body))
+
+            ((<prompt> tag body handler)
+             (primitive 'call-with-prompt)
+             (recurse tag) (recurse body) (recurse handler))
+
+            ((<abort> tag args tail)
+             (primitive 'apply)
+             (primitive 'abort)
+             (recurse tag) (for-each recurse args) (recurse tail)))))
+
+      (let ()
+        (define output-name-table (make-hash-table))
+        (define (set-output-name! s name)
+          (hashq-set! output-name-table s name))
+        (define (output-name s)
+          (if (top-level? s)
+              (top-level-name s)
+              (hashq-ref output-name-table s)))
+
+        (define sorted-lexical-gensyms
+          (sort-list lexical-gensyms
+                     (lambda (a b) (> (occurrence-count a)
+                                      (occurrence-count b)))))
+
+        (for-each (lambda (s)
+                    (set-output-name!
+                     s
+                     (let ((the-conflicts (conflicts s))
+                           (the-source-name (source-name s)))
+                       (define (not-yet-taken? name)
+                         (not (any (lambda (s*)
+                                     (and=> (output-name s*)
+                                            (cut eq? name <>)))
+                                   the-conflicts)))
+                       (if (not-yet-taken? the-source-name)
+                           the-source-name
+                           (let ((prefix (string-append
+                                          (symbol->string the-source-name)
+                                          "-")))
+                             (let loop ((i 1) (name the-source-name))
+                               (if (not-yet-taken? name)
+                                   name
+                                   (loop (+ i 1)
+                                         (string->symbol
+                                          (string-append
+                                           prefix
+                                           (number->string i)))))))))))
+                  sorted-lexical-gensyms)
+        (values output-name-table occurrence-count-table)))))
diff --git a/spec.scm b/spec.scm
new file mode 100644
index 0000000..18af552
--- /dev/null
+++ b/spec.scm
@@ -0,0 +1,63 @@
+;;; Guile Scheme specification
+
+;; Copyright (C) 2001, 2009, 2010, 2011, 2012, 2021 Free Software Foundation, Inc.
+
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 3 of the License, or (at your option) any later version.
+;;;; 
+;;;; This library is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;;; Lesser General Public License for more details.
+;;;; 
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+;;; Code:
+
+(define-module (language scheme spec)
+  #:use-module (system base compile)
+  #:use-module (system base language)
+  #:use-module (language scheme compile-tree-il)
+  #:use-module (language scheme decompile-tree-il)
+  #:export (scheme))
+
+;;;
+;;; Language definition
+;;;
+
+(define-language scheme
+  #:title	"Scheme"
+  #:reader      (lambda (port env)
+                  ;; Use the binding of current-reader from the environment.
+                  ;; FIXME: Handle `read-options' as well?
+                  ((or (and=> (and=> (module-variable env 'current-reader)
+                                     variable-ref)
+                              fluid-ref)
+                       read-syntax)
+                   port))
+
+  #:compilers   `((tree-il . ,compile-tree-il))
+  #:decompilers `((tree-il . ,decompile-tree-il))
+  #:evaluator	(lambda (x module) (primitive-eval x))
+  #:printer	write
+  #:make-default-environment
+                (lambda ()
+                  ;; Ideally we'd duplicate the whole module hierarchy so that `set!',
+                  ;; `fluid-set!', etc. don't have any effect in the current environment.
+                  (let ((m (make-fresh-user-module)))
+                    ;; Provide a separate `current-reader' fluid so that
+                    ;; compile-time changes to `current-reader' are
+                    ;; limited to the current compilation unit.
+                    (module-define! m 'current-reader (make-fluid))
+
+                    ;; Default to `simple-format', as is the case until
+                    ;; (ice-9 format) is loaded.  This allows
+                    ;; compile-time warnings to be emitted when using
+                    ;; unsupported options.
+                    (module-set! m 'format simple-format)
+
+                    m)))
-- 
2.39.5