Merge remote-tracking branch 'origin/stable-2.0'

Conflicts:
	configure.ac

module/ice-9/boot-9.scm

@@ -732,6 +732,9 @@ If there is no handler at all, Guile prints an error and then exits."
              (_ (default-printer)))
            args))
 
+  (define (getaddrinfo-error-printer port key args default-printer)
+    (format port "In procedure getaddrinfo: ~a" (gai-strerror (car args))))
+
   (set-exception-printer! 'goops-error scm-error-printer)
   (set-exception-printer! 'host-not-found scm-error-printer)
   (set-exception-printer! 'keyword-argument-error scm-error-printer)
@@ -751,7 +754,9 @@ If there is no handler at all, Guile prints an error and then exits."
   (set-exception-printer! 'wrong-number-of-args scm-error-printer)
   (set-exception-printer! 'wrong-type-arg scm-error-printer)
 
-  (set-exception-printer! 'syntax-error syntax-error-printer))
+  (set-exception-printer! 'syntax-error syntax-error-printer)
+
+  (set-exception-printer! 'getaddrinfo-error getaddrinfo-error-printer))
 
 
 
@@ -2874,6 +2879,36 @@ module '(ice-9 q) '(make-q q-length))}."
                            ...)
                body body* ...)))))))
 
+
+;;;
+;;; Current ports as parameters.
+;;;
+
+(let ((fluid->parameter
+       (lambda (fluid conv)
+         (make-struct <parameter> 0
+                      (case-lambda
+                        (() (fluid-ref fluid))
+                        ((x) (let ((prev (fluid-ref fluid)))
+                               (fluid-set! fluid (conv x))
+                               prev)))
+                      fluid conv))))
+  (define-syntax-rule (port-parameterize! binding fluid predicate msg)
+    (begin
+      (set! binding (fluid->parameter (module-ref (current-module) 'fluid)
+                                      (lambda (x)
+                                        (if (predicate x) x
+                                            (error msg x)))))
+      (module-remove! (current-module) 'fluid)))
+  
+  (port-parameterize! current-input-port %current-input-port-fluid
+                      input-port? "expected an input port")
+  (port-parameterize! current-output-port %current-output-port-fluid
+                      output-port? "expected an output port")
+  (port-parameterize! current-error-port %current-error-port-fluid
+                      output-port? "expected an output port"))
+
+
 
 ;;;
 ;;; Warnings.
@@ -3611,8 +3646,9 @@ module '(ice-9 q) '(make-q q-length))}."
     srfi-4   ;; homogenous numeric vectors
     srfi-6   ;; open-input-string etc, in the guile core
     srfi-13  ;; string library
-    srfi-23  ;; `error` procedure
     srfi-14  ;; character sets
+    srfi-23  ;; `error` procedure
+    srfi-39  ;; parameterize
     srfi-55  ;; require-extension
     srfi-61  ;; general cond clause
     ))

module/ice-9/session.scm

@@ -17,16 +17,17 @@
 
 
 (define-module (ice-9 session)
-  :use-module (ice-9 documentation)
-  :use-module (ice-9 regex)
-  :use-module (ice-9 rdelim)
-  :export (help
-           add-value-help-handler! remove-value-help-handler!
-           add-name-help-handler! remove-name-help-handler!
-           apropos apropos-internal apropos-fold apropos-fold-accessible
-           apropos-fold-exported apropos-fold-all source arity
-           procedure-arguments
-           module-commentary))
+  #:use-module (ice-9 documentation)
+  #:use-module (ice-9 regex)
+  #:use-module (ice-9 rdelim)
+  #:export (help
+            add-value-help-handler! remove-value-help-handler!
+            add-name-help-handler! remove-name-help-handler!
+            apropos-hook
+            apropos apropos-internal apropos-fold apropos-fold-accessible
+            apropos-fold-exported apropos-fold-all source arity
+            procedure-arguments
+            module-commentary))
 
 
 
@@ -284,8 +285,13 @@ where OPTIONSET is one of debug, read, eval, print
 ;;; Author: Roland Orre <orre@nada.kth.se>
 ;;;
 
+;; Two arguments: the module, and the pattern, as a string.
+;;
+(define apropos-hook (make-hook 2))
+
 (define (apropos rgx . options)
   "Search for bindings: apropos regexp {options= 'full 'shadow 'value}"
+  (run-hook apropos-hook (current-module) rgx)
   (if (zero? (string-length rgx))
       "Empty string not allowed"
       (let* ((match (make-regexp rgx))
@@ -354,6 +360,7 @@ Fourth arg FOLDER is one of
   (apropos-fold-accessible MODULE) ;fold over bindings accessible in MODULE
   apropos-fold-exported		   ;fold over all exported bindings
   apropos-fold-all		   ;fold over all bindings"
+  (run-hook apropos-hook (current-module) rgx)
   (let ((match (make-regexp rgx))
 	(recorded (make-hash-table)))
     (let ((fold-module

module/language/tree-il/peval.scm

@@ -99,6 +99,47 @@
            (or (proc (vlist-ref vlist i))
                (lp (1+ i)))))))
 
+(define (truncate-values x)
+  "Discard all but the first value of X."
+  (let loop ((x x))
+    (match x
+      (($ <const>) x)
+      (($ <lexical-ref>) x)
+      (($ <void>) x)
+      (($ <lexical-ref>) x)
+      (($ <primitive-ref>) x)
+      (($ <module-ref>) x)
+      (($ <toplevel-ref>) x)
+      (($ <conditional> src condition subsequent alternate)
+       (make-conditional src condition (loop subsequent) (loop alternate)))
+      (($ <application> _ ($ <primitive-ref> _ 'values) (first _ ...))
+       first)
+      (($ <application> _ ($ <primitive-ref> _ 'values) (val))
+       val)
+      (($ <application> src
+          (and prim ($ <primitive-ref> _ (? singly-valued-primitive?)))
+          args)
+       (make-application src prim (map loop args)))
+      (($ <application> src proc args)
+       (make-application src proc (map loop args)))
+      (($ <sequence> src (exps ... last))
+       (make-sequence src (append exps (list (loop last)))))
+      (($ <lambda>) x)
+      (($ <dynlet> src fluids vals body)
+       (make-dynlet src fluids vals (loop body)))
+      (($ <let> src names gensyms vals body)
+       (make-let src names gensyms vals (loop body)))
+      (($ <letrec> src in-order? names gensyms vals body)
+       (make-letrec src in-order? names gensyms vals (loop body)))
+      (($ <fix> src names gensyms vals body)
+       (make-fix src names gensyms vals body))
+      (($ <let-values> src exp body)
+       (make-let-values src exp (loop body)))
+      (else
+       (make-application (tree-il-src x)
+                         (make-primitive-ref #f 'values)
+                         (list x))))))
+
 ;; Peval will do a one-pass analysis on the source program to determine
 ;; the set of assigned lexicals, and to identify unreferenced and
 ;; singly-referenced lexicals.
@@ -278,8 +319,10 @@
   (constant-value operand-constant-value set-operand-constant-value!))
 
 (define* (make-operand var sym #:optional source visit)
+  ;; Bind SYM to VAR, with value SOURCE.
   ;; Bound operands are considered copyable until we prove otherwise.
-  (%make-operand var sym visit source 0 #f (and source #t) #f #f))
+  (let ((source (if source (truncate-values source) source)))
+    (%make-operand var sym visit source 0 #f (and source #t) #f #f)))
 
 (define (make-bound-operands vars syms sources visit)
   (map (lambda (x y z) (make-operand x y z visit)) vars syms sources))

module/srfi/srfi-39.scm

@@ -35,104 +35,19 @@
 ;;; Code:
 
 (define-module (srfi srfi-39)
-  #:use-module (srfi srfi-16)
-
-  #:export (make-parameter)
-  #:export-syntax (parameterize)
-
   ;; helper procedure not in srfi-39.
   #:export (with-parameters*)
-  #:replace (current-input-port current-output-port current-error-port))
+  #:re-export (make-parameter
+               parameterize
+               current-input-port current-output-port current-error-port))
 
-;; Make 'srfi-39 available as a feature identifiere to `cond-expand'.
-;;
-(cond-expand-provide (current-module) '(srfi-39))
-
-(define make-parameter
-  (case-lambda
-    ((val) (make-parameter/helper val (lambda (x) x)))
-    ((val conv) (make-parameter/helper val conv))))
-
-(define get-fluid-tag (lambda () 'get-fluid)) ;; arbitrary unique (as per eq?) value
-(define get-conv-tag (lambda () 'get-conv)) ;; arbitrary unique (as per eq?) value
-
-(define (make-parameter/helper val conv)
-  (let ((fluid (make-fluid (conv val))))
-    (case-lambda
-      (()
-       (fluid-ref fluid))
-      ((new-value)
-       (cond
-        ((eq? new-value get-fluid-tag) fluid)
-        ((eq? new-value get-conv-tag) conv)
-        (else (fluid-set! fluid (conv new-value))))))))
-
-(define-syntax-rule (parameterize ((?param ?value) ...) ?body ...)
-  (with-parameters* (list ?param ...)
-                    (list ?value ...)
-                    (lambda () ?body ...)))
-
-(define current-input-port
-  (case-lambda
-    (()
-     ((@ (guile) current-input-port)))
-    ((new-value)
-     (set-current-input-port new-value))))
-
-(define current-output-port
-  (case-lambda
-    (()
-     ((@ (guile) current-output-port)))
-    ((new-value)
-     (set-current-output-port new-value))))
-
-(define current-error-port
-  (case-lambda
-    (()
-     ((@ (guile) current-error-port)))
-    ((new-value)
-     (set-current-error-port new-value))))
-
-(define port-list
-  (list current-input-port current-output-port current-error-port))
-
-;; There are no fluids behind current-input-port etc, so those parameter
-;; objects are picked out of the list and handled separately with a
-;; dynamic-wind to swap their values to and from a location (the "value"
-;; variable in the swapper procedure "let").
-;;
-;; current-input-port etc are already per-dynamic-root, so this arrangement
-;; works the same as a fluid.  Perhaps they could become fluids for ease of
-;; implementation here.
-;;
-;; Notice the use of a param local variable for the swapper procedure.  It
-;; ensures any application changes to the PARAMS list won't affect the
-;; winding.
-;;
 (define (with-parameters* params values thunk)
   (let more ((params params)
 	     (values values)
 	     (fluids '())     ;; fluids from each of PARAMS
-	     (convs  '())     ;; VALUES with conversion proc applied
-	     (swapper noop))  ;; wind/unwind procedure for ports handling
+	     (convs  '()))    ;; VALUES with conversion proc applied
     (if (null? params)
-	(if (eq? noop swapper)
-	    (with-fluids* fluids convs thunk)
-	    (dynamic-wind
-		swapper
-		(lambda ()
-		  (with-fluids* fluids convs thunk))
-		swapper))
-	(if (memq (car params) port-list)
-	    (more (cdr params) (cdr values)
-		  fluids convs
-		  (let ((param (car params))
-			(value (car values))
-			(prev-swapper swapper))
-		    (lambda ()
-		      (set! value (param value))
-		      (prev-swapper))))
-	    (more (cdr params) (cdr values)
-		  (cons ((car params) get-fluid-tag) fluids)
-		  (cons (((car params) get-conv-tag) (car values)) convs)
-		  swapper)))))
+	(with-fluids* fluids convs thunk)
+        (more (cdr params) (cdr values)
+              (cons (parameter-fluid (car params)) fluids)
+              (cons ((parameter-converter (car params)) (car values)) convs)))))