Objective-C layer: Add functions for determining the Objective-C runtime used and for asking for the size of types by typespec.

darcs-hash:197f36840c1568c5b3431833a0118d06729b9247

5 files changed, 96 insertions, 1 deletions

diff --git a/Lisp/defpackage.lisp b/Lisp/defpackage.lisp
index 0de0341..2a04fb6 100644
--- a/Lisp/defpackage.lisp
+++ b/Lisp/defpackage.lisp
@@ -41,4 +41,12 @@
            ;; Metaclasses
            #:objective-c-class))
 
+
+(defpackage #:mulk.objective-cl-features
+  (:nicknames #:objcl-features #:objective-cl-features #:mulk.objcl-features)
+  (:use)
+  (:export #:gnu-runtime
+           #:next-runtime))
+
+
 #-(or cmu sbcl) (declaim (declaration values))
diff --git a/Lisp/init.lisp b/Lisp/init.lisp
index 72d616f..a56d2e2 100644
--- a/Lisp/init.lisp
+++ b/Lisp/init.lisp
@@ -9,4 +9,10 @@
   (unless (boundp '+yes+)
     (defconstant +yes+ (objcl-get-yes)))
   (unless (boundp '+no+)
-    (defconstant +no+ (objcl-get-no))))
+    (defconstant +no+ (objcl-get-no)))
+  (unless (boundp '+runtime-type+)
+    (defconstant +runtime-type+ (runtime-type)))
+  (pushnew (case +runtime-type+
+             ((:gnu) 'objcl-features:gnu-runtime)
+             ((:next) 'objcl-features:next-runtime))
+           *features*))
diff --git a/Lisp/libobjcl.lisp b/Lisp/libobjcl.lisp
index 1d14e8b..d2f3e3c 100644
--- a/Lisp/libobjcl.lisp
+++ b/Lisp/libobjcl.lisp
@@ -64,6 +64,17 @@
     :pointer
   (obj :pointer))
 
+(defcfun ("objcl_get_runtime_type" %objcl-get-runtime-type) :string)
+
+(defcfun ("objcl_sizeof_type" %objcl-sizeof-type) :long
+  (typespec :string))
+
+(defcfun ("objcl_sizeof_return_type" %objcl-sizeof-return-type) :long
+  (typespec :string))
+
+(defcfun ("objcl_alignof_type" %objcl-alignof-type) :long
+  (typespec :string))
+
 (defcfun objcl-get-nil :pointer)
 (defcfun objcl-get-yes :long)
 (defcfun objcl-get-no :long)
@@ -523,3 +534,23 @@ Returns: (VALUES typespec byte-position string-position)"
               byte-position)
             #-(or) nil
             string-position)))
+
+
+;;;; (@* "Helper functions")
+(defun sizeof (typespec)
+  (%objcl-sizeof-type typespec))
+
+(defun alignof (typespec)
+  (%objcl-alignof-type typespec))
+
+(defun return-type-sizeof (typespec)
+  (%objcl-sizeof-return-type typespec))
+
+(defun runtime-type ()
+  (let ((runtime (%objcl-get-runtime-type)))
+    (assert (member runtime '("GNU" "NeXT") :test #'string=)
+            (runtime)
+            "Unkown Objective-C runtime type ~S.  Allowed: (\"GNU\" \"NeXT\")."
+            runtime)
+    (cond ((string= runtime "GNU") :gnu)
+          ((string= runtime "NeXT") :next))))
diff --git a/Objective-C/libobjcl.h b/Objective-C/libobjcl.h
index c84dbb9..2ebea37 100644
--- a/Objective-C/libobjcl.h
+++ b/Objective-C/libobjcl.h
@@ -69,3 +69,15 @@ objcl_get_yes (void);
 
 long
 objcl_get_no (void);
+
+const char *
+objcl_get_runtime_type (void);
+
+long
+objcl_sizeof_type (const char *typespec);
+
+long
+objcl_sizeof_return_type (const char *typespec);
+
+long
+objcl_alignof_type (const char *typespec);
diff --git a/Objective-C/libobjcl.m b/Objective-C/libobjcl.m
index 205a998..8c4f3fd 100644
--- a/Objective-C/libobjcl.m
+++ b/Objective-C/libobjcl.m
@@ -248,3 +248,41 @@ objcl_get_no (void)
     fprintf (stderr, "WARNING: objcl_get_no: NO might not fit into a long.\n");
   return NO;
 }
+
+
+const char *
+objcl_get_runtime_type (void)
+{
+#ifdef __NEXT_RUNTIME__
+  return "NeXT";
+#else
+  return "GNU";
+#endif
+}
+
+
+long
+objcl_sizeof_type (const char *typespec)
+{
+  if (sizeof (ssize_t) > sizeof (long))
+    fprintf (stderr, "WARNING: objcl_sizeof_typespec: Size might not fit into a long.\n");
+  return PyObjCRT_SizeOfType (typespec);
+}
+
+
+long
+objcl_sizeof_return_type (const char *typespec)
+{
+  if (sizeof (ssize_t) > sizeof (long))
+    fprintf (stderr, "WARNING: objcl_sizeof_return_typespec: Size might not fit into a long.\n");
+  return PyObjCRT_SizeOfReturnType (typespec);
+}
+
+
+long
+objcl_alignof_type (const char *typespec)
+{
+  if (sizeof (ssize_t) > sizeof (long))
+    fprintf (stderr, "WARNING: objcl_align_typespec: Alignment might not fit into a long.\n");
+  return PyObjCRT_AlignOfType (typespec);
+}