objc-msg-simulator-i386.s   [plain text]

/*
 * Copyright (c) 1999-2009 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 defined(__i386__)  &&  TARGET_IPHONE_SIMULATOR

#define __OBJC2__ 1

#include "objc-config.h"

.data

// Substitute receiver for messages sent to nil (usually also nil)
// id _objc_nilReceiver
.align 4
.private_extern __objc_nilReceiver
__objc_nilReceiver:
	.long   0

// _objc_entryPoints and _objc_exitPoints are used by objc
// to get the critical regions for which method caches 
// cannot be garbage collected.

.private_extern _objc_entryPoints
_objc_entryPoints:
	.long	__cache_getImp
	.long	__cache_getMethod
	.long	_objc_msgSend
	.long	_objc_msgSend_fpret
	.long	_objc_msgSend_stret
	.long	_objc_msgSendSuper
	.long	_objc_msgSendSuper2
	.long	_objc_msgSendSuper_stret
	.long	_objc_msgSendSuper2_stret
	.long	0

.private_extern _objc_exitPoints
_objc_exitPoints:
	.long	LGetImpExit
	.long	LGetMethodExit
	.long	LMsgSendExit
	.long	LMsgSendFpretExit
	.long	LMsgSendStretExit
	.long	LMsgSendSuperExit
	.long	LMsgSendSuper2Exit
	.long	LMsgSendSuperStretExit
	.long	LMsgSendSuper2StretExit
	.long	0


/********************************************************************
 *
 * Structure definitions.
 *
 ********************************************************************/

// Offsets from %esp
	self            = 4
	super           = 4
	selector        = 8
	marg_size       = 12
	marg_list       = 16
	first_arg       = 12

	struct_addr     = 4

	self_stret      = 8
	super_stret     = 8
	selector_stret  = 12
	marg_size_stret = 16
	marg_list_stret = 20

// objc_super parameter to sendSuper
	receiver        = 0
	class           = 4

// Selected field offsets in class structure
	isa             = 0
	superclass	= 4
#if __OBJC2__
	cache           = 8
#else
	cache           = 32
#endif

// Method descriptor
	method_name     = 0
	method_imp      = 8

// Cache header
	mask            = 0
	occupied        = 4
	buckets         = 8		// variable length array


//////////////////////////////////////////////////////////////////////
//
// ENTRY		functionName
//
// Assembly directives to begin an exported function.
//
// Takes: functionName - name of the exported function
//////////////////////////////////////////////////////////////////////

.macro ENTRY
	.text
	.globl	$0
	.align	2, 0x90
$0:
.endmacro

.macro STATIC_ENTRY
	.text
	.private_extern	$0
	.align	4, 0x90
$0:
.endmacro

//////////////////////////////////////////////////////////////////////
//
// END_ENTRY	functionName
//
// Assembly directives to end an exported function.  Just a placeholder,
// a close-parenthesis for ENTRY, until it is needed for something.
//
// Takes: functionName - name of the exported function
//////////////////////////////////////////////////////////////////////

.macro END_ENTRY
.endmacro


/////////////////////////////////////////////////////////////////////
//
//
// CacheLookup	WORD_RETURN | STRUCT_RETURN, MSG_SEND | MSG_SENDSUPER | MSG_SENDSUPER2 | CACHE_GET, cacheMissLabel
//
// Locate the implementation for a selector in a class method cache.
//
// Takes: WORD_RETURN	   (first parameter is at sp+4)
//        STRUCT_RETURN	   (struct address is at sp+4, first parameter at sp+8)
//        MSG_SEND	   (first parameter is receiver)
//        MSG_SENDSUPER[2] (first parameter is address of objc_super structure)
//        CACHE_GET	   (first parameter is class; return method triplet)
//        selector in %ecx
//        class to search in %edx
//
//	  cacheMissLabel = label to branch to iff method is not cached
//
// On exit: (found) MSG_SEND and MSG_SENDSUPER[2]: return imp in eax
//          (found) CACHE_GET: return method triplet in eax
//          (not found) jumps to cacheMissLabel
//	
/////////////////////////////////////////////////////////////////////


// Values to specify to method lookup macros whether the return type of
// the method is word or structure.
WORD_RETURN   = 0
STRUCT_RETURN = 1

// Values to specify to method lookup macros whether the first argument
// is an object/class reference or a 'objc_super' structure.
MSG_SEND       = 0	// first argument is receiver, search the isa
MSG_SENDSUPER  = 1	// first argument is objc_super, search the class
MSG_SENDSUPER2 = 2	// first argument is objc_super, search the class
CACHE_GET      = 3	// first argument is class, search that class

.macro	CacheLookup

// load variables and save caller registers.

	pushl	%edi			// save scratch register
	movl	cache(%edx), %edi	// cache = class->cache
	pushl	%esi			// save scratch register

	movl	mask(%edi), %esi		// mask = cache->mask
	movl	%ecx, %edx		// index = selector
	shrl	$$2, %edx		// index = selector >> 2

// search the receiver's cache
// ecx = selector
// edi = cache
// esi = mask
// edx = index
// eax = method (soon)
LMsgSendProbeCache_$0_$1_$2:
	andl	%esi, %edx		// index &= mask
	movl	buckets(%edi, %edx, 4), %eax	// meth = cache->buckets[index]

	testl	%eax, %eax		// check for end of bucket
	je	LMsgSendCacheMiss_$0_$1_$2	// go to cache miss code
	cmpl	method_name(%eax), %ecx	// check for method name match
	je	LMsgSendCacheHit_$0_$1_$2	// go handle cache hit
	addl	$$1, %edx			// bump index ...
	jmp	LMsgSendProbeCache_$0_$1_$2 // ... and loop

// not found in cache: restore state and go to callers handler
LMsgSendCacheMiss_$0_$1_$2:

.if $0 == WORD_RETURN			// Regular word return
.if $1 == MSG_SEND			// MSG_SEND
	popl	%esi			//  restore callers register
	popl	%edi			//  restore callers register
	movl	self(%esp), %edx	//  get messaged object
	movl	isa(%edx), %eax		//  get objects class
.elseif $1 == MSG_SENDSUPER || $1 == MSG_SENDSUPER2  // MSG_SENDSUPER[2]
	// replace "super" arg with "receiver"
	movl	super+8(%esp), %edi	//  get super structure
	movl	receiver(%edi), %edx	//  get messaged object
	movl	%edx, super+8(%esp)	//  make it the first argument
	movl	class(%edi), %eax	//  get messaged class
	.if $1 == MSG_SENDSUPER2
	movl	superclass(%eax), %eax	//  get messaged class
	.endif
	popl	%esi			//  restore callers register
	popl	%edi			//  restore callers register
.else					// CACHE_GET
	popl	%esi			//  restore callers register
	popl	%edi			//  restore callers register
.endif
.else					// Struct return
.if $1 == MSG_SEND			// MSG_SEND (stret)
	popl	%esi			//  restore callers register
	popl	%edi			//  restore callers register
	movl	self_stret(%esp), %edx	//  get messaged object
	movl	isa(%edx), %eax		//  get objects class
.elseif $1 == MSG_SENDSUPER || $1 == MSG_SENDSUPER2 // MSG_SENDSUPER[2] (stret)
	// replace "super" arg with "receiver"
	movl	super_stret+8(%esp), %edi//  get super structure
	movl	receiver(%edi), %edx	//  get messaged object
	movl	%edx, super_stret+8(%esp)//  make it the first argument
	movl	class(%edi), %eax	//  get messaged class
	.if $1 == MSG_SENDSUPER2
	movl	superclass(%eax), %eax	//  get messaged class
	.endif
	popl	%esi			//  restore callers register
	popl	%edi			//  restore callers register
.else					// CACHE_GET
	!! This should not happen.
.endif
.endif

					// edx = receiver
					// ecx = selector
					// eax = class
	jmp	$2			// go to callers handler

// eax points to matching cache entry
	.align	4, 0x90
LMsgSendCacheHit_$0_$1_$2:

// load implementation address, restore state, and we're done
.if $1 == CACHE_GET
	// method triplet is already in eax
.else
	movl	method_imp(%eax), %eax	// imp = method->method_imp
.endif

.if $0 == WORD_RETURN			// Regular word return
.if $1 == MSG_SENDSUPER || $1 == MSG_SENDSUPER2
	// replace "super" arg with "self"
	movl	super+8(%esp), %edi
	movl	receiver(%edi), %esi
	movl	%esi, super+8(%esp)
.endif
.else					// Struct return
.if $1 == MSG_SENDSUPER || $1 == MSG_SENDSUPER2
	// replace "super" arg with "self"
	movl	super_stret+8(%esp), %edi
	movl	receiver(%edi), %esi
	movl	%esi, super_stret+8(%esp)
.endif
.endif

	// restore caller registers
	popl	%esi
	popl	%edi
.endmacro


/////////////////////////////////////////////////////////////////////
//
// MethodTableLookup WORD_RETURN | STRUCT_RETURN, MSG_SEND | MSG_SENDSUPER
//
// Takes: WORD_RETURN	(first parameter is at sp+4)
//	  STRUCT_RETURN	(struct address is at sp+4, first parameter at sp+8)
// 	  MSG_SEND	(first parameter is receiver)
//	  MSG_SENDSUPER	(first parameter is address of objc_super structure)
//
//	  edx = receiver
// 	  ecx = selector
// 	  eax = class
//        (all set by CacheLookup's miss case)
// 
// Stack must be at 0xXXXXXXXc on entrance.
//
// On exit:  esp unchanged
//           imp in eax
//
/////////////////////////////////////////////////////////////////////

.macro MethodTableLookup
	// stack is already aligned
	pushl	%eax			// class
	pushl	%ecx			// selector
	pushl	%edx			// receiver
	call	__class_lookupMethodAndLoadCache3
	addl    $$12, %esp		// pop parameters
.endmacro


/********************************************************************
 * Method _cache_getMethod(Class cls, SEL sel, IMP msgForward_internal_imp)
 *
 * If found, returns method triplet pointer.
 * If not found, returns NULL.
 *
 * NOTE: _cache_getMethod never returns any cache entry whose implementation
 * is _objc_msgForward_internal. It returns 1 instead. This prevents thread-
 * safety and memory management bugs in _class_lookupMethodAndLoadCache. 
 * See _class_lookupMethodAndLoadCache for details.
 *
 * _objc_msgForward_internal is passed as a parameter because it's more 
 * efficient to do the (PIC) lookup once in the caller than repeatedly here.
 ********************************************************************/
        
	.private_extern __cache_getMethod
	ENTRY __cache_getMethod

// load the class and selector
	movl	selector(%esp), %ecx
	movl	self(%esp), %edx

// do lookup
	CacheLookup WORD_RETURN, CACHE_GET, LGetMethodMiss

// cache hit, method triplet in %eax
	movl    first_arg(%esp), %ecx   // check for _objc_msgForward_internal
	cmpl    method_imp(%eax), %ecx  // if (imp==_objc_msgForward_internal)
	je      1f                      //     return (Method)1
	ret                             // else return method triplet address
1:	movl	$1, %eax
	ret

LGetMethodMiss:
// cache miss, return nil
	xorl    %eax, %eax      // zero %eax
	ret

LGetMethodExit:
	END_ENTRY __cache_getMethod


/********************************************************************
 * IMP _cache_getImp(Class cls, SEL sel)
 *
 * If found, returns method implementation.
 * If not found, returns NULL.
 ********************************************************************/

	.private_extern __cache_getImp
	ENTRY __cache_getImp

// load the class and selector
	movl    selector(%esp), %ecx
	movl	self(%esp), %edx

// do lookup
	CacheLookup WORD_RETURN, CACHE_GET, LGetImpMiss

// cache hit, method triplet in %eax
	movl    method_imp(%eax), %eax  // return method imp
	ret

LGetImpMiss:
// cache miss, return nil
	xorl    %eax, %eax      // zero %eax
	ret

LGetImpExit:
	END_ENTRY __cache_getImp


/********************************************************************
 *
 * id objc_msgSend(id self, SEL	_cmd,...);
 *
 ********************************************************************/

	ENTRY	_objc_msgSend

// load receiver and selector
	movl    selector(%esp), %ecx
	movl	self(%esp), %eax

#if SUPPORT_IGNORED_SELECTOR_CONSTANT
// check whether selector is ignored
	cmpl    $ kIgnore, %ecx
	je      LMsgSendDone		// return self from %eax
#endif

// check whether receiver is nil 
	testl	%eax, %eax
	je	LMsgSendNilSelf

// receiver (in %eax) is non-nil: search the cache
LMsgSendReceiverOk:
	movl	isa(%eax), %edx		// class = self->isa
	CacheLookup WORD_RETURN, MSG_SEND, LMsgSendCacheMiss
	xor	%edx, %edx		// set nonstret for msgForward_internal
	jmp	*%eax

// cache miss: go search the method lists
LMsgSendCacheMiss:
	MethodTableLookup WORD_RETURN, MSG_SEND
	xor	%edx, %edx		// set nonstret for msgForward_internal
	jmp	*%eax			// goto *imp

// message sent to nil: redirect to nil receiver, if any
LMsgSendNilSelf:
	call	1f			// load new receiver
1:	popl	%edx
	movl	__objc_nilReceiver-1b(%edx),%eax
	testl	%eax, %eax		// return nil if no new receiver
	je	LMsgSendReturnZero
	movl	%eax, self(%esp)	// send to new receiver
	jmp	LMsgSendReceiverOk	// receiver must be in %eax
LMsgSendReturnZero:
	// %eax is already zero
	movl	$0,%edx
LMsgSendDone:
	ret
LMsgSendExit:
	END_ENTRY	_objc_msgSend

/********************************************************************
 *
 * id objc_msgSendSuper(struct objc_super *super, SEL _cmd,...);
 *
 * struct objc_super {
 *		id	receiver;
 *		Class	class;
 * };
 ********************************************************************/

	ENTRY	_objc_msgSendSuper

// load selector and class to search
	movl	super(%esp), %eax	// struct objc_super
	movl    selector(%esp), %ecx
	movl	class(%eax), %edx	// struct objc_super->class

#if SUPPORT_IGNORED_SELECTOR_CONSTANT
// check whether selector is ignored
	cmpl    $ kIgnore, %ecx
	je      LMsgSendSuperIgnored	// return self from %eax
#endif

// search the cache (class in %edx)
	CacheLookup WORD_RETURN, MSG_SENDSUPER, LMsgSendSuperCacheMiss
	xor	%edx, %edx		// set nonstret for msgForward_internal
	jmp	*%eax			// goto *imp

// cache miss: go search the method lists
LMsgSendSuperCacheMiss:
	MethodTableLookup WORD_RETURN, MSG_SENDSUPER
	xor	%edx, %edx		// set nonstret for msgForward_internal
	jmp	*%eax			// goto *imp

// ignored selector: return self
LMsgSendSuperIgnored:
	movl	super(%esp), %eax
	movl    receiver(%eax), %eax
	ret
	
LMsgSendSuperExit:
	END_ENTRY	_objc_msgSendSuper


	ENTRY	_objc_msgSendSuper2

// load selector and class to search
	movl	super(%esp), %eax	// struct objc_super
	movl    selector(%esp), %ecx
	movl	class(%eax), %eax	// struct objc_super->class
	mov	superclass(%eax), %edx	// edx = objc_super->class->super_class

#if SUPPORT_IGNORED_SELECTOR_CONSTANT
// check whether selector is ignored
	cmpl    $ kIgnore, %ecx
	je      LMsgSendSuperIgnored	// return self from %eax
#endif

// search the cache (class in %edx)
	CacheLookup WORD_RETURN, MSG_SENDSUPER2, LMsgSendSuper2CacheMiss
	xor	%edx, %edx		// set nonstret for msgForward_internal
	jmp	*%eax			// goto *imp

// cache miss: go search the method lists
LMsgSendSuper2CacheMiss:
	MethodTableLookup WORD_RETURN, MSG_SENDSUPER2
	xor	%edx, %edx		// set nonstret for msgForward_internal
	jmp	*%eax			// goto *imp

// ignored selector: return self
LMsgSendSuper2Ignored:
	movl	super(%esp), %eax
	movl    receiver(%eax), %eax
	ret
	
LMsgSendSuper2Exit:
	END_ENTRY	_objc_msgSendSuper2


/********************************************************************
 *
 * double objc_msgSend_fpret(id self, SEL _cmd,...);
 *
 ********************************************************************/

	ENTRY	_objc_msgSend_fpret

// load receiver and selector
	movl    selector(%esp), %ecx
	movl	self(%esp), %eax

#if SUPPORT_IGNORED_SELECTOR_CONSTANT
// check whether selector is ignored
	cmpl    $ kIgnore, %ecx
	je      LMsgSendFpretDone	// return self from %eax
#endif

// check whether receiver is nil 
	testl	%eax, %eax
	je	LMsgSendFpretNilSelf

// receiver (in %eax) is non-nil: search the cache
LMsgSendFpretReceiverOk:
	movl	isa(%eax), %edx		// class = self->isa
	CacheLookup WORD_RETURN, MSG_SEND, LMsgSendFpretCacheMiss
	xor	%edx, %edx		// set nonstret for msgForward_internal
	jmp	*%eax			// goto *imp

// cache miss: go search the method lists
LMsgSendFpretCacheMiss:
	MethodTableLookup WORD_RETURN, MSG_SEND
	xor	%edx, %edx		// set nonstret for msgForward_internal
	jmp	*%eax			// goto *imp

// message sent to nil: redirect to nil receiver, if any
LMsgSendFpretNilSelf:
	call	1f			// load new receiver
1:	popl	%edx
	movl	__objc_nilReceiver-1b(%edx),%eax
	testl	%eax, %eax		// return zero if no new receiver
	je	LMsgSendFpretReturnZero
	movl	%eax, self(%esp)	// send to new receiver
	jmp	LMsgSendFpretReceiverOk	// receiver must be in %eax
LMsgSendFpretReturnZero:
	fldz
LMsgSendFpretDone:
	ret

LMsgSendFpretExit:
	END_ENTRY	_objc_msgSend_fpret
	

/********************************************************************
 *
 * void	objc_msgSend_stret(void *st_addr	, id self, SEL _cmd, ...);
 *
 *
 * objc_msgSend_stret is the struct-return form of msgSend.
 * The ABI calls for (sp+4) to be used as the address of the structure
 * being returned, with the parameters in the succeeding locations.
 *
 * On entry:	(sp+4)is the address where the structure is returned,
 *		(sp+8) is the message receiver,
 *		(sp+12) is the selector
 ********************************************************************/

	ENTRY	_objc_msgSend_stret

// load receiver and selector
	movl	self_stret(%esp), %eax
	movl	(selector_stret)(%esp), %ecx

// check whether receiver is nil 
	testl	%eax, %eax
	je	LMsgSendStretNilSelf

// receiver (in %eax) is non-nil: search the cache
LMsgSendStretReceiverOk:
	movl	isa(%eax), %edx		//   class = self->isa
	CacheLookup STRUCT_RETURN, MSG_SEND, LMsgSendStretCacheMiss
	movl	$1, %edx		// set stret for objc_msgForward
	jmp	*%eax			// goto *imp

// cache miss: go search the method lists
LMsgSendStretCacheMiss:
	MethodTableLookup STRUCT_RETURN, MSG_SEND
	movl	$1, %edx		// set stret for objc_msgForward
	jmp	*%eax			// goto *imp

// message sent to nil: redirect to nil receiver, if any
LMsgSendStretNilSelf:
	call	1f			// load new receiver
1:	popl	%edx
	movl	__objc_nilReceiver-1b(%edx),%eax
	testl	%eax, %eax		// return nil if no new receiver
	je	LMsgSendStretDone
	movl	%eax, self_stret(%esp)	// send to new receiver
	jmp	LMsgSendStretReceiverOk	// receiver must be in %eax
LMsgSendStretDone:
	ret	$4			// pop struct return address (#2995932)
LMsgSendStretExit:
	END_ENTRY	_objc_msgSend_stret

/********************************************************************
 *
 * void objc_msgSendSuper_stret(void *st_addr, struct objc_super *super, SEL _cmd, ...);
 *
 * struct objc_super {
 *		id	receiver;
 *		Class	class;
 * };
 *
 * objc_msgSendSuper_stret is the struct-return form of msgSendSuper.
 * The ABI calls for (sp+4) to be used as the address of the structure
 * being returned, with the parameters in the succeeding registers.
 *
 * On entry:	(sp+4)is the address where the structure is returned,
 *		(sp+8) is the address of the objc_super structure,
 *		(sp+12) is the selector
 *
 ********************************************************************/

	ENTRY	_objc_msgSendSuper_stret

// load selector and class to search
	movl	super_stret(%esp), %eax	// struct objc_super
	movl	(selector_stret)(%esp), %ecx	//   get selector
	movl	class(%eax), %edx	// struct objc_super->class

// search the cache (class in %edx)
	CacheLookup STRUCT_RETURN, MSG_SENDSUPER, LMsgSendSuperStretCacheMiss
	movl	$1, %edx		// set stret for objc_msgForward
	jmp	*%eax			// goto *imp

// cache miss: go search the method lists
LMsgSendSuperStretCacheMiss:
	MethodTableLookup STRUCT_RETURN, MSG_SENDSUPER
	movl	$1, %edx		// set stret for objc_msgForward
	jmp	*%eax			// goto *imp

LMsgSendSuperStretExit:
	END_ENTRY	_objc_msgSendSuper_stret


	ENTRY	_objc_msgSendSuper2_stret

// load selector and class to search
	movl	super_stret(%esp), %eax	// struct objc_super
	movl	(selector_stret)(%esp), %ecx	//   get selector
	movl	class(%eax), %eax	// struct objc_super->class
	mov	superclass(%eax), %edx	// edx = objc_super->class->super_class

// search the cache (class in %edx)
	CacheLookup STRUCT_RETURN, MSG_SENDSUPER2, LMsgSendSuper2StretCacheMiss
	movl	$1, %edx		// set stret for objc_msgForward
	jmp	*%eax			// goto *imp

// cache miss: go search the method lists
LMsgSendSuper2StretCacheMiss:
	MethodTableLookup STRUCT_RETURN, MSG_SENDSUPER2
	movl	$1, %edx		// set stret for objc_msgForward
	jmp	*%eax			// goto *imp

LMsgSendSuper2StretExit:
	END_ENTRY	_objc_msgSendSuper2_stret


/********************************************************************
 *
 * id _objc_msgForward(id self, SEL _cmd,...);
 *
 ********************************************************************/

// _FwdSel is @selector(forward::), set up in map_images().
// ALWAYS dereference _FwdSel to get to "forward::" !!
	.data
	.align 2
	.private_extern _FwdSel
_FwdSel: .long 0


	.cstring
	.align 2
LUnkSelStr: .ascii "Does not recognize selector %s\0"

	.data
	.align 2
	.private_extern __objc_forward_handler
__objc_forward_handler:	.long 0

	.data
	.align 2
	.private_extern __objc_forward_stret_handler
__objc_forward_stret_handler:	.long 0

	ENTRY	__objc_msgForward_internal
	.private_extern __objc_msgForward_internal
	// Method cache version
	
	// THIS IS NOT A CALLABLE C FUNCTION
	// Out-of-band register %edx is nonzero for stret, zero otherwise
	
	// Check return type (stret or not)
	testl	%edx, %edx
	jnz	__objc_msgForward_stret
	jmp	__objc_msgForward
	
	END_ENTRY	_objc_msgForward_internal

	
	ENTRY	__objc_msgForward
	// Non-struct return version

	// Get PIC base into %edx
	call	L__objc_msgForward$pic_base
L__objc_msgForward$pic_base:
	popl	%edx
	
	// Call user handler, if any
	movl	__objc_forward_handler-L__objc_msgForward$pic_base(%edx),%ecx
	testl	%ecx, %ecx		// if not NULL
	je	1f			//   skip to default handler
	jmp	*%ecx			// call __objc_forward_handler
1:	
	// No user handler
	// Push stack frame
	pushl   %ebp
	movl    %esp, %ebp
	
	// Die if forwarding "forward::"
	movl    (selector+4)(%ebp), %eax
	movl	_FwdSel-L__objc_msgForward$pic_base(%edx),%ecx
	cmpl	%ecx, %eax
	je	LMsgForwardError

	// Call [receiver forward:sel :margs]
	subl    $8, %esp		// 16-byte align the stack
	leal    (self+4)(%ebp), %ecx
	pushl	%ecx			// &margs
	pushl	%eax			// sel
	movl	_FwdSel-L__objc_msgForward$pic_base(%edx),%ecx
	pushl	%ecx			// forward::
	pushl   (self+4)(%ebp)		// receiver
	
	call	_objc_msgSend
	
	movl    %ebp, %esp
	popl    %ebp
	ret

LMsgForwardError:
	// Call __objc_error(receiver, "unknown selector %s", "forward::")
	subl    $12, %esp		// 16-byte align the stack
	movl	_FwdSel-L__objc_msgForward$pic_base(%edx),%eax
	pushl 	%eax
	leal	LUnkSelStr-L__objc_msgForward$pic_base(%edx),%eax
	pushl 	%eax
	pushl   (self+4)(%ebp)
	call	___objc_error	// never returns

	END_ENTRY	__objc_msgForward


	ENTRY	__objc_msgForward_stret
	// Struct return version

	// Get PIC base into %edx
	call	L__objc_msgForwardStret$pic_base
L__objc_msgForwardStret$pic_base:
	popl	%edx

	// Call user handler, if any
	movl	__objc_forward_stret_handler-L__objc_msgForwardStret$pic_base(%edx), %ecx
	testl	%ecx, %ecx		// if not NULL
	je	1f			//   skip to default handler
	jmp	*%ecx			// call __objc_forward_stret_handler
1:	
	// No user handler
	// Push stack frame
	pushl	%ebp
	movl	%esp, %ebp

	// Die if forwarding "forward::"
	movl	(selector_stret+4)(%ebp), %eax
	movl	_FwdSel-L__objc_msgForwardStret$pic_base(%edx), %ecx
	cmpl	%ecx, %eax
	je	LMsgForwardStretError

	// Call [receiver forward:sel :margs]
	subl    $8, %esp		// 16-byte align the stack
	leal    (self_stret+4)(%ebp), %ecx
	pushl	%ecx			// &margs
	pushl	%eax			// sel
	movl	_FwdSel-L__objc_msgForwardStret$pic_base(%edx),%ecx
	pushl	%ecx			// forward::
	pushl   (self_stret+4)(%ebp)	// receiver
	
	call	_objc_msgSend
	
	movl    %ebp, %esp
	popl    %ebp
	ret	$4			// pop struct return address (#2995932)

LMsgForwardStretError:
	// Call __objc_error(receiver, "unknown selector %s", "forward::")
	subl    $12, %esp		// 16-byte align the stack
	leal	_FwdSel-L__objc_msgForwardStret$pic_base(%edx),%eax
	pushl 	%eax
	leal	LUnkSelStr-L__objc_msgForwardStret$pic_base(%edx),%eax
	pushl 	%eax
	pushl   (self_stret+4)(%ebp)
	call	___objc_error	// never returns

	END_ENTRY	__objc_msgForward_stret


	ENTRY _objc_msgSend_debug
	jmp	_objc_msgSend
	END_ENTRY _objc_msgSend_debug

	ENTRY _objc_msgSendSuper2_debug
	jmp	_objc_msgSendSuper2
	END_ENTRY _objc_msgSendSuper2_debug

	ENTRY _objc_msgSend_stret_debug
	jmp	_objc_msgSend_stret
	END_ENTRY _objc_msgSend_stret_debug

	ENTRY _objc_msgSendSuper2_stret_debug
	jmp	_objc_msgSendSuper2_stret
	END_ENTRY _objc_msgSendSuper2_stret_debug

	ENTRY _objc_msgSend_fpret_debug
	jmp	_objc_msgSend_fpret
	END_ENTRY _objc_msgSend_fpret_debug


	ENTRY _objc_msgSend_noarg
	jmp	_objc_msgSend
	END_ENTRY _objc_msgSend_noarg
	

	ENTRY _method_invoke

	movl	selector(%esp), %ecx
	movl	method_name(%ecx), %edx
	movl	method_imp(%ecx), %eax
	movl	%edx, selector(%esp)
	jmp	*%eax
	
	END_ENTRY _method_invoke


	ENTRY _method_invoke_stret

	movl	selector_stret(%esp), %ecx
	movl	method_name(%ecx), %edx
	movl	method_imp(%ecx), %eax
	movl	%edx, selector_stret(%esp)
	jmp	*%eax
	
	END_ENTRY _method_invoke_stret

#if !defined(NDEBUG)
	STATIC_ENTRY __objc_ignored_method
	
	movl	self(%esp), %eax
	ret
	
	END_ENTRY __objc_ignored_method
#endif

#endif