1.0.4.33: check that context is not a null-alien

[sbcl.git] / src / code / interr.lisp

diff --git a/src/code/interr.lisp b/src/code/interr.lisp
index 5bb783f..b441516 100644 (file)
--- a/src/code/interr.lisp
+++ b/src/code/interr.lisp
@@ -363,8 +363,8 @@
           (values "<error finding caller name -- trapped debug-condition>"
                   nil)))))
 
-(defun find-interrupted-name ()
-  (/show0 "entering FIND-INTERRUPTED-NAME")
+(defun find-interrupted-name-and-frame ()
+  (/show0 "entering FIND-INTERRUPTED-NAME-AND-FRAME")
   (if *finding-name*
       (values "<error finding interrupted name -- already finding name>" nil)
       (handler-case
@@ -390,6 +390,7 @@
           (values "<error finding interrupted name -- trapped debug-condition>"
                   nil)))))
 \f
+
 ;;;; INTERNAL-ERROR signal handler
 
 (defun internal-error (context continuable)
@@ -400,7 +401,7 @@
   (infinite-error-protect
    (/show0 "about to bind ALIEN-CONTEXT")
    (let ((alien-context (locally
-                          (declare (optimize (inhibit-warnings 3)))
+                            (declare (optimize (inhibit-warnings 3)))
                           (sb!alien:sap-alien context (* os-context-t)))))
      (/show0 "about to bind ERROR-NUMBER and ARGUMENTS")
      (multiple-value-bind (error-number arguments)
@@ -418,7 +419,7 @@
          (%primitive sb!c:halt))
 
        (multiple-value-bind (name sb!debug:*stack-top-hint*)
-           (find-interrupted-name)
+           (find-interrupted-name-and-frame)
          (/show0 "back from FIND-INTERRUPTED-NAME")
          (let ((fp (int-sap (sb!vm:context-register alien-context
                                                     sb!vm::cfp-offset)))
@@ -454,11 +455,40 @@
              "Control stack guard page temporarily disabled: proceed with caution~%")
      (error 'control-stack-exhausted))))
 
+;;; KLUDGE: we keep a single HEAP-EXHAUSTED-ERROR object around, so
+;;; that we don't need to allocate it when running out of memory. Similarly
+;;; we pass the amounts in special variables as there may be multiple threads
+;;; running into trouble at the same time. The condition is created by GC-REINIT.
+(defvar *heap-exhausted-error-condition*)
+(defvar *heap-exhausted-error-available-bytes*)
+(defvar *heap-exhausted-error-requested-bytes*)
+
+(defun heap-exhausted-error (available requested)
+  (infinite-error-protect
+   (let ((*heap-exhausted-error-available-bytes* available)
+         (*heap-exhausted-error-requested-bytes* requested))
+     (error *heap-exhausted-error-condition*))))
+
 (defun undefined-alien-variable-error ()
   (error 'undefined-alien-variable-error))
 
 (defun undefined-alien-function-error ()
   (error 'undefined-alien-function-error))
 
+#!-win32
+(define-alien-variable current-memory-fault-address long)
+
+#!-win32
 (defun memory-fault-error ()
-  (error 'memory-fault-error))
+  (error 'memory-fault-error
+         :address current-memory-fault-address))
+
+;;; This is SIGTRAP / EXCEPTION_BREAKPOINT that runtime could not deal
+;;; with. Prior to Windows we just had a Lisp side handler for
+;;; SIGTRAP, but now we need to deal this portably.
+(defun unhandled-trap-error (context-sap)
+  (declare (type system-area-pointer context-sap))
+  (infinite-error-protect
+   (let ((context (sap-alien context-sap (* os-context-t))))
+     (error "Unhandled breakpoint/trap at #x~X."
+            (sap-int (sb!vm:context-pc context))))))