Don't ensure fluids all over the place but scan for variables needed and ensure just before the compiled code all those.

* module/language/elisp/README: Document this.
* module/language/elisp/compile-tree-il.scm: Implement it here, pass bindings all around the compilation.
* module/language/elisp/bindings.scm: New module with symbol-tracking abilities needed for this.

module/language/elisp/bindings.scm

@@ -0,0 +1,74 @@
+;;; Guile Emac Lisp
+
+;; Copyright (C) 2001 Free Software Foundation, Inc.
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+;; 
+;; This program 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 General Public License for more details.
+;; 
+;; You should have received a copy of the GNU General Public License
+;; along with this program; see the file COPYING.  If not, write to
+;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Code:
+
+(define-module (language elisp bindings)
+  #:export (make-bindings mark-fluid-needed! map-fluids-needed))
+
+; This module defines routines to handle analysis of symbol bindings used
+; during elisp compilation.  This data allows to collect the symbols, for
+; which fluids need to be created, or mark certain symbols as lexically bound.
+
+
+; Record type used to hold the data necessary.
+
+(define bindings-type (make-record-type 'bindings '(needed-fluids)))
+
+
+; Construct an 'empty' instance of the bindings data structure to be used
+; at the start of a fresh compilation.
+
+(define (make-bindings)
+  ((record-constructor bindings-type) '()))
+
+
+; Mark that a given symbol is needed as fluid in the specified slot-module.
+
+(define (mark-fluid-needed! bindings sym module)
+  (let* ((old-needed ((record-accessor bindings-type 'needed-fluids) bindings))
+         (old-in-module (or (assoc-ref old-needed module) '()))
+         (new-in-module (if (memq sym old-in-module)
+                          old-in-module
+                          (cons sym old-in-module)))
+         (new-needed (assoc-set! old-needed module new-in-module)))
+    ((record-modifier bindings-type 'needed-fluids) bindings new-needed)))
+
+
+; Cycle through all fluids needed in order to generate the code for their
+; creation or some other analysis.
+
+(define (map-fluids-needed bindings proc)
+  (let* ((needed ((record-accessor bindings-type 'needed-fluids) bindings)))
+    (let iterate-modules ((mod-tail needed)
+                          (mod-result '()))
+      (if (null? mod-tail)
+        mod-result
+        (iterate-modules
+          (cdr mod-tail)
+          (let* ((aentry (car mod-tail))
+                 (module (car aentry))
+                 (symbols (cdr aentry)))
+            (let iterate-symbols ((sym-tail symbols)
+                                  (sym-result mod-result))
+              (if (null? sym-tail)
+                sym-result
+                (iterate-symbols (cdr sym-tail)
+                                 (cons (proc module (car sym-tail))
+                                       sym-result))))))))))