From b7b5bd2d3ca7f3e339512582179e355d4df71293 Mon Sep 17 00:00:00 2001
From: Matthias Benkard <code@mail.matthias.benkard.de>
Date: Sun, 3 Feb 2008 22:35:36 +0100
Subject: Objective-C layer: Add slot handling functions.

darcs-hash:b4ec2fb1229c4eb9f3201e378a2d3e6e5fc6b872
---
 Objective-C/PyObjC/pyobjc.h |  2 +-
 Objective-C/libobjcl.h      | 27 +++++++++++++++++
 Objective-C/libobjcl.m      | 70 +++++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 95 insertions(+), 4 deletions(-)

diff --git a/Objective-C/PyObjC/pyobjc.h b/Objective-C/PyObjC/pyobjc.h
index 3a159c8..f762f70 100644
--- a/Objective-C/PyObjC/pyobjc.h
+++ b/Objective-C/PyObjC/pyobjc.h
@@ -5,7 +5,6 @@
 
 #include <stdlib.h>
 #include <stdio.h>
-#include "libobjcl.h"
 
 #ifdef __NEXT_RUNTIME__
 #include "pyobjc-compat.h"
@@ -51,5 +50,6 @@
 
 #include "objc_support.h"
 #include "libffi_support.h"
+#import "libobjcl.h"
 
 #endif /* __pyobjc_H */
diff --git a/Objective-C/libobjcl.h b/Objective-C/libobjcl.h
index 968cf14..09b08ab 100644
--- a/Objective-C/libobjcl.h
+++ b/Objective-C/libobjcl.h
@@ -22,6 +22,10 @@
 
 #include "../config.h"
 
+#import "PyObjC/pyobjc.h"
+#import "PyObjC/objc_support.h"
+#import "PyObjC/objc-runtime-compat.h"
+
 #ifdef USE_LIBFFI
 #ifdef HAVE_FFI_H
 #include <ffi.h>
@@ -33,6 +37,12 @@
 #endif
 #endif
 
+#ifdef __NEXT_RUNTIME__
+typedef Ivar IVAR_T;
+#else
+typedef struct objc_ivar *IVAR_T;
+#endif
+
 extern NSException *objcl_oom_exception;
 
 
@@ -118,3 +128,20 @@ objcl_sizeof_return_type (const char *typespec);
 
 long
 objcl_alignof_type (const char *typespec);
+
+void
+objcl_set_slot_value (id obj, const char *ivar_name, void *value);
+
+void *
+objcl_slot_value (id obj, const char *ivar_name);
+
+/* The following function returns a freshly consed array that the caller
+   must deallocate. */
+IVAR_T *
+objcl_class_direct_slots (Class class, unsigned int *count, unsigned int *element_size);
+
+const char *
+objcl_slot_name (IVAR_T ivar);
+
+const char *
+objcl_slot_type (IVAR_T ivar);
diff --git a/Objective-C/libobjcl.m b/Objective-C/libobjcl.m
index 53fbaaf..f49d502 100644
--- a/Objective-C/libobjcl.m
+++ b/Objective-C/libobjcl.m
@@ -19,8 +19,6 @@
 
 #import "libobjcl.h"
 #import "PyObjC/libffi_support.h"
-#import "PyObjC/objc_support.h"
-#import "PyObjC/objc-runtime-compat.h"
 
 #import <Foundation/Foundation.h>
 #include <stdarg.h>
@@ -30,7 +28,6 @@
 #include <objc/objc-class.h>
 #endif
 
-
 static NSAutoreleasePool *objcl_autorelease_pool = NULL;
 
 /* Preallocate an exception to throw when memory is all used up. */
@@ -372,3 +369,70 @@ objcl_alignof_type (const char *typespec)
     fprintf (stderr, "WARNING: objcl_align_typespec: Alignment might not fit into a long.\n");
   return PyObjCRT_AlignOfType (typespec);
 }
+
+
+void
+objcl_set_slot_value (id obj, const char *ivar_name, void *value)
+{
+  /* For the GNU runtime, this function is defined in objc-runtime-gnu.m. */
+  object_setInstanceVariable (obj, ivar_name, value);
+}
+
+
+void *
+objcl_slot_value (id obj, const char *ivar_name)
+{
+  void *value;
+  /* Caching Ivars may be useful here.  Using those instead of strings
+     is claimed to be faster. */
+  /* For the GNU runtime, this function is defined in objc-runtime-gnu.m. */
+  object_getInstanceVariable (obj, ivar_name, &value);
+  return value;
+}
+
+
+IVAR_T *
+objcl_class_direct_slots (Class class, unsigned int *count, unsigned int *element_size)
+{
+  IVAR_T *ivars;
+
+#ifdef __NEXT_RUNTIME__
+#else
+  int i;
+#endif
+
+  *element_size = sizeof (IVAR_T);
+
+#ifdef __NEXT_RUNTIME__
+  ivars = class_copyIvarList (class, count);
+#else
+  *count = class->ivars->ivar_count;
+  ivars = malloc ((*count) * (*element_size));
+  for (i = 0; i < *count; i++)
+    ivars[i] = &class->ivars->ivar_list[i];
+#endif
+
+  return ivars;
+}
+
+
+const char *
+objcl_slot_name (IVAR_T ivar)
+{
+#ifdef __NEXT_RUNTIME__
+  return ivar_getName (ivar);
+#else
+  return ivar->ivar_name;
+#endif
+}
+
+
+const char *
+objcl_slot_type (IVAR_T ivar)
+{
+#ifdef __NEXT_RUNTIME__
+  return ivar_getTypeEncoding (ivar);
+#else
+  return ivar->ivar_type;
+#endif
+}
-- 
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