runtime/Accessors.subproj/objc-accessors-i386.s

   1 /*
   2  * Copyright (c) 2006 Apple Inc.  All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 //////////////////////////////////////////////////////////////////////
  25 //
  26 // ENTRY                functionName
  27 //
  28 // Assembly directives to begin an exported function.
  29 //
  30 // Takes: functionName - name of the exported function
  31 //////////////////////////////////////////////////////////////////////
  32
  33 .macro ENTRY
  34         .text
  35         .globl  $0
  36 $0:
  37 .endmacro
  38
  39 //////////////////////////////////////////////////////////////////////
  40 //
  41 // END_ENTRY    functionName
  42 //
  43 // Assembly directives to end an exported function.  Just a placeholder,
  44 // a close-parenthesis for ENTRY, until it is needed for something.
  45 //
  46 // Takes: functionName - name of the exported function
  47 //////////////////////////////////////////////////////////////////////
  48
  49 .macro END_ENTRY
  50 .endmacro
  51
  52 //////////////////////////////////////////////////////////////////////
  53 //
  54 // OBJC_GET_PROPERTY_OFFSET     offset
  55 //
  56 // Optimized id typed accessor methods.
  57 // Generates an accesssor for a specified compile time offset.
  58 //
  59 // Takes: offset - offset of an id typed instance variable
  60 //////////////////////////////////////////////////////////////////////
  61
  62 .macro OBJC_GET_PROPERTY_OFFSET
  63         .private_extern __objc_getProperty_offset_$0
  64     ENTRY __objc_getProperty_offset_$0
  65         movl    4(%esp), %eax
  66         movl    $0(%eax), %eax
  67     ret
  68     END_ENTRY __objc_getProperty_offset_$0
  69 .endmacro
  70
  71 /*
  72  * Thunk to retrieve PC.
  73  * `call 1; 1: pop` sequence breaks any branch-prediction stack.
  74  */
  75 L_get_pc_thunk.edx:
  76         movl    (%esp,1), %edx
  77         ret
  78
  79 .macro LAZY_PIC_FUNCTION_STUB
  80 .data
  81 .picsymbol_stub
  82 L$0$stub:
  83         .indirect_symbol $0
  84         call    L_get_pc_thunk.edx
  85 L0$$0:
  86         movl    L$0$lz - L0$$0(%edx), %ecx
  87         jmp             *%ecx
  88 L$0$stub_binder:
  89         lea             L$0$lz - L0$$0(%edx),%eax
  90         pushl   %eax
  91         jmp             dyld_stub_binding_helper
  92         nop
  93 .data
  94 .lazy_symbol_pointer
  95 L$0$lz:
  96         .indirect_symbol $0
  97         .long L$0$stub_binder
  98 .endmacro
  99
 100 LAZY_PIC_FUNCTION_STUB  _objc_assign_ivar_gc
 101 #define OBJC_ASSIGN_IVAR L_objc_assign_ivar_gc$stub // call objc_assign_ivar_gc() directly to avoid extra levels of testing/branching
 102
 103 .macro OBJC_SET_PROPERTY_OFFSET
 104         .private_extern __objc_setProperty_offset_$0
 105         ENTRY __objc_setProperty_offset_$0
 106         movl    4(%esp), %eax
 107         movl    %eax, 8(%esp)                                   // pass self as the second parameter.
 108         movl    12(%esp), %eax
 109         movl    %eax, 4(%esp)                                   // pass value as the first parameter.
 110         movl    $$$0, 12(%esp)                                  // pass the offset as the third parameter.
 111         jmp             OBJC_ASSIGN_IVAR                                // objc_assign_ivar_gc() is __private_extern__
 112         END_ENTRY __objc_setProperty_offset_$0
 113 .endmacro
 114
 115 /********************************************************************
 116  * id _objc_getProperty_offset_N(id self, SEL _cmd);
 117  ********************************************************************/
 118
 119         OBJC_GET_PROPERTY_OFFSET        0
 120         OBJC_GET_PROPERTY_OFFSET        4
 121         OBJC_GET_PROPERTY_OFFSET        8
 122         OBJC_GET_PROPERTY_OFFSET        12
 123         OBJC_GET_PROPERTY_OFFSET        16
 124         OBJC_GET_PROPERTY_OFFSET        20
 125         OBJC_GET_PROPERTY_OFFSET        24
 126         OBJC_GET_PROPERTY_OFFSET        28
 127         OBJC_GET_PROPERTY_OFFSET        32
 128         OBJC_GET_PROPERTY_OFFSET        36
 129         OBJC_GET_PROPERTY_OFFSET        40
 130         OBJC_GET_PROPERTY_OFFSET        44
 131         OBJC_GET_PROPERTY_OFFSET        48
 132         OBJC_GET_PROPERTY_OFFSET        52
 133         OBJC_GET_PROPERTY_OFFSET        56
 134         OBJC_GET_PROPERTY_OFFSET        60
 135         OBJC_GET_PROPERTY_OFFSET        64
 136
 137 /********************************************************************
 138  * id _objc_setProperty_offset_N(id self, SEL _cmd, id value);
 139  ********************************************************************/
 140
 141         OBJC_SET_PROPERTY_OFFSET        0
 142         OBJC_SET_PROPERTY_OFFSET        4
 143         OBJC_SET_PROPERTY_OFFSET        8
 144         OBJC_SET_PROPERTY_OFFSET        12
 145         OBJC_SET_PROPERTY_OFFSET        16
 146         OBJC_SET_PROPERTY_OFFSET        20
 147         OBJC_SET_PROPERTY_OFFSET        24
 148         OBJC_SET_PROPERTY_OFFSET        28
 149         OBJC_SET_PROPERTY_OFFSET        32
 150         OBJC_SET_PROPERTY_OFFSET        36
 151         OBJC_SET_PROPERTY_OFFSET        40
 152         OBJC_SET_PROPERTY_OFFSET        44
 153         OBJC_SET_PROPERTY_OFFSET        48
 154         OBJC_SET_PROPERTY_OFFSET        52
 155         OBJC_SET_PROPERTY_OFFSET        56
 156         OBJC_SET_PROPERTY_OFFSET        60
 157         OBJC_SET_PROPERTY_OFFSET        64