-/*
- * Copyright (c) 2004, 2007 Apple Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#include <TargetConditionals.h>
-
-#if __i386__ && !TARGET_OS_IPHONE && !TARGET_OS_WIN32
-
-/*
- This file defines the non-GC variants of objc_assign_* on a dedicated
- page in the (__DATA,__data) section. At load time under GC, each
- routine is overwritten with a jump to its GC variant. It is necessary
- for these routines to exist on a dedicated page for vm_protect to
- work properly in the GC case. The page exists in the data segment to
- reduce the kernel's page table overhead.
-
- Note: To avoid wasting more space than necessary at runtime, this file
- must not contain anything other than the objc_assign_* routines.
-*/
-
-.section __IMPORT, __objctext, regular, pure_instructions + self_modifying_code
-
-.align 12 // align to page boundary
-
-// id objc_assign_ivar(id value, id dest, ptrdiff_t offset);
-.globl _objc_assign_ivar
-_objc_assign_ivar:
- pushl %ebp
- movl %esp,%ebp
- movl 0x08(%ebp),%eax // value
- movl 0x0c(%ebp),%ecx // dest
- movl 0x10(%ebp),%edx // offset
- movl %eax,(%ecx,%edx) // return (*(dest + offset) = value);
- leave
- ret
-
-// id objc_assign_global(id value, id *dest);
-.globl _objc_assign_global
-_objc_assign_global:
- pushl %ebp
- movl %esp,%ebp
- movl 0x08(%ebp),%eax // value
- movl 0x0c(%ebp),%edx // dest
- movl %eax,(%edx) // return (*dest = value);
- leave
- ret
-
-// id objc_assign_threadlocal(id value, id *dest);
-.globl _objc_assign_threadlocal
-_objc_assign_threadlocal:
- pushl %ebp
- movl %esp,%ebp
- movl 0x08(%ebp),%eax // value
- movl 0x0c(%ebp),%edx // dest
- movl %eax,(%edx) // return (*dest = value);
- leave
- ret
-
-// As of OS X 10.5, objc_assign_strongCast_non_gc is identical to
-// objc_assign_global_non_gc.
-
-// id objc_assign_strongCast(id value, id *dest);
-.globl _objc_assign_strongCast
-_objc_assign_strongCast:
- pushl %ebp
- movl %esp,%ebp
- movl 0x08(%ebp),%eax // value
- movl 0x0c(%ebp),%edx // dest
- movl %eax,(%edx) // return (*dest = value);
- leave
- ret
-
-// Claim the remainder of the page.
-.align 12, 0
-
-#endif
projects / apple / objc4.git / commitdiff
