Stop (describe (make-instance 'generic-function)) from crashing.

All the describy things can be pried out of a generic function only if
it's a standard-generic-function.
Also add an FNDB entry for FUNCTION-LAMBDA-EXPRESSION.

diff --git a/src/code/describe.lisp b/src/code/describe.lisp
index 77f3c36..50f45ac 100644 (file)
--- a/src/code/describe.lisp
+++ b/src/code/describe.lisp
@@ -616,7 +616,7 @@
                                            (:declared :declared)
                                            ;; This is hopefully clearer to users
                                            ((:defined-method :defined) :derived))))))
-                       (if (typep fun 'generic-function)
+                       (if (typep fun 'standard-generic-function)
                            (values fun
                                    "a generic function"
                                    (sb-mop:generic-function-lambda-list fun)

diff --git a/src/compiler/fndb.lisp b/src/compiler/fndb.lisp
index bb39bc4..0909630 100644 (file)
--- a/src/compiler/fndb.lisp
+++ b/src/compiler/fndb.lisp
@@ -1374,6 +1374,7 @@
   null)
 
 (defknown describe (t &optional (or stream (member t nil))) (values))
+(defknown function-lambda-expression (function) (values t boolean t))
 (defknown inspect (t) (values))
 (defknown room (&optional (member t nil :default)) (values))
 (defknown ed (&optional (or symbol cons filename))

diff --git a/tests/interface.impure.lisp b/tests/interface.impure.lisp
index 0838bdd..da179ed 100644 (file)
--- a/tests/interface.impure.lisp
+++ b/tests/interface.impure.lisp
@@ -30,31 +30,32 @@
 (assert (string= (documentation #'(setf foo) 'function)
                  "(setf foo) documentation"))
 \f
+(with-test (:name :disassemble)
 ;;; DISASSEMBLE shouldn't fail on closures or unpurified functions
-(defun disassemble-fun (x) x)
-(disassemble 'disassemble-fun)
-
-(let ((x 1)) (defun disassemble-closure (y) (if y (setq x y) x)))
-(disassemble 'disassemble-closure)
-
-#+sb-eval
-(progn
-  ;; Nor should it fail on interpreted functions
-  (let ((sb-ext:*evaluator-mode* :interpret))
-    (eval `(defun disassemble-eval (x) x))
-    (disassemble 'disassemble-eval))
-
-  ;; disassemble-eval should still be an interpreted function.
-  ;; clhs disassemble: "(If that function is an interpreted function,
-  ;; it is first compiled but the result of this implicit compilation
-  ;; is not installed.)"
-  (assert (sb-eval:interpreted-function-p #'disassemble-eval)))
-
-;; nor should it fail on generic functions or other funcallable instances
-(defgeneric disassemble-generic (x))
-(disassemble 'disassemble-generic)
-(let ((fin (sb-mop:make-instance 'sb-mop:funcallable-standard-object)))
-  (disassemble fin))
+  (defun disassemble-fun (x) x)
+  (disassemble 'disassemble-fun)
+
+  (let ((x 1)) (defun disassemble-closure (y) (if y (setq x y) x)))
+  (disassemble 'disassemble-closure)
+
+  #+sb-eval
+  (progn
+    ;; Nor should it fail on interpreted functions
+    (let ((sb-ext:*evaluator-mode* :interpret))
+      (eval `(defun disassemble-eval (x) x))
+      (disassemble 'disassemble-eval))
+
+    ;; disassemble-eval should still be an interpreted function.
+    ;; clhs disassemble: "(If that function is an interpreted function,
+    ;; it is first compiled but the result of this implicit compilation
+    ;; is not installed.)"
+    (assert (sb-eval:interpreted-function-p #'disassemble-eval)))
+
+  ;; nor should it fail on generic functions or other funcallable instances
+  (defgeneric disassemble-generic (x))
+  (disassemble 'disassemble-generic)
+  (let ((fin (make-instance 'sb-mop:funcallable-standard-object)))
+    (disassemble fin)))
 
 ;;; while we're at it, much the same applies to
 ;;; FUNCTION-LAMBDA-EXPRESSION:
@@ -69,7 +70,11 @@
     (assert (eql (fle-name #'fle-closure) 'fle-closure))
     (assert (eql (fle-name #'disassemble-generic) 'disassemble-generic))
     (function-lambda-expression
-     (sb-mop:make-instance 'sb-mop:funcallable-standard-object))
+     (make-instance 'sb-mop:funcallable-standard-object))
+    (function-lambda-expression
+     (make-instance 'generic-function))
+    (function-lambda-expression
+     (make-instance 'standard-generic-function))
     #+sb-eval
     (progn
       (let ((sb-ext:*evaluator-mode* :interpret))
@@ -86,6 +91,10 @@
 (let ((sb-ext:*evaluator-mode* :compile))
   (eval `(let (x) (defun closure-to-describe () (incf x)))))
 
+(with-test (:name :describe-empty-gf)
+  (describe (make-instance 'generic-function))
+  (describe (make-instance 'standard-generic-function)))
+
 ;;; DESCRIBE should run without signalling an error.
 (with-test (:name (describe :no-error))
   (describe (make-to-be-described))