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111
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1 /* Basic data types for Objective C.
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145
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2 Copyright (C) 1998-2020 Free Software Foundation, Inc.
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111
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3 Contributed by Ovidiu Predescu.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "objc-private/common.h"
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27 #include "objc/objc.h"
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28
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29 #if OBJC_WITH_GC
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30
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31 #include "tconfig.h"
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32 #include <assert.h>
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33 #include <ctype.h> /* For isdigit. */
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34 #include <string.h>
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35 #include <stdlib.h>
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36 #include "objc/runtime.h"
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37 #include "objc-private/module-abi-8.h"
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38
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39 #include <gc/gc.h>
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40 #include <limits.h>
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41
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42 /* gc_typed.h uses the following but doesn't declare them */
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43 typedef GC_word word;
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44 typedef GC_signed_word signed_word;
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45 #define BITS_PER_WORD (CHAR_BIT * sizeof (word))
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46
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47 #include <gc/gc_typed.h>
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48
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49 /* The following functions set up in `mask` the corresponding pointers.
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50 The offset is incremented with the size of the type. */
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51
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52 #define ROUND(V, A) \
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53 ({ typeof (V) __v = (V); typeof (A) __a = (A); \
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54 __a * ((__v+__a - 1)/__a); })
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55
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56 #define SET_BIT_FOR_OFFSET(mask, offset) \
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57 GC_set_bit (mask, offset / sizeof (void *))
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58
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59 /* Some prototypes */
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60 static void
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61 __objc_gc_setup_struct (GC_bitmap mask, const char *type, int offset);
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62 static void
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63 __objc_gc_setup_union (GC_bitmap mask, const char *type, int offset);
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64
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65
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66 static void
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67 __objc_gc_setup_array (GC_bitmap mask, const char *type, int offset)
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68 {
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69 int i, len = atoi (type + 1);
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70
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71 while (isdigit (*++type))
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72 /* do nothing */; /* skip the size of the array */
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73
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74 switch (*type) {
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75 case _C_ARY_B:
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76 for (i = 0; i < len; i++)
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77 __objc_gc_setup_array (mask, type, offset);
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78 break;
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79
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80 case _C_STRUCT_B:
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81 for (i = 0; i < len; i++)
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82 __objc_gc_setup_struct (mask, type, offset);
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83 break;
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84
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85 case _C_UNION_B:
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86 for (i = 0; i < len; i++)
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87 __objc_gc_setup_union (mask, type, offset);
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88 break;
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89
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90 default:
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91 break;
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92 }
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93 }
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94
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95 static void
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96 __objc_gc_setup_struct (GC_bitmap mask, const char *type, int offset)
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97 {
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98 struct objc_struct_layout layout;
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99 unsigned int position;
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100 const char *mtype;
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101
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102 objc_layout_structure (type, &layout);
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103
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104 while (objc_layout_structure_next_member (&layout))
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105 {
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106 BOOL gc_invisible = NO;
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107
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108 objc_layout_structure_get_info (&layout, &position, NULL, &mtype);
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109
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110 /* Skip the variable name */
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111 if (*mtype == '"')
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112 {
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113 for (mtype++; *mtype++ != '"';)
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114 /* do nothing */;
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115 }
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116
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117 if (*mtype == _C_GCINVISIBLE)
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118 {
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119 gc_invisible = YES;
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120 mtype++;
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121 }
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122
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123 /* Add to position the offset of this structure */
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124 position += offset;
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125
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126 switch (*mtype) {
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127 case _C_ID:
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128 case _C_CLASS:
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129 case _C_SEL:
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130 case _C_PTR:
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131 case _C_CHARPTR:
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132 case _C_ATOM:
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133 if (! gc_invisible)
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134 SET_BIT_FOR_OFFSET (mask, position);
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135 break;
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136
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137 case _C_ARY_B:
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138 __objc_gc_setup_array (mask, mtype, position);
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139 break;
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140
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141 case _C_STRUCT_B:
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142 __objc_gc_setup_struct (mask, mtype, position);
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143 break;
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144
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145 case _C_UNION_B:
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146 __objc_gc_setup_union (mask, mtype, position);
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147 break;
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148
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149 default:
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150 break;
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151 }
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152 }
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153 }
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154
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155 static void
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156 __objc_gc_setup_union (GC_bitmap mask, const char *type, int offset)
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157 {
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158 /* Sub-optimal, quick implementation: assume the union is made of
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159 pointers, set up the mask accordingly. */
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160
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161 int i, size, align;
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162
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163 /* Skip the variable name */
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164 if (*type == '"')
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165 {
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166 for (type++; *type++ != '"';)
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167 /* do nothing */;
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168 }
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169
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170 size = objc_sizeof_type (type);
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171 align = objc_alignof_type (type);
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172
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173 offset = ROUND (offset, align);
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174 for (i = 0; i < size; i += sizeof (void *))
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175 {
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176 SET_BIT_FOR_OFFSET (mask, offset);
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177 offset += sizeof (void *);
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178 }
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179 }
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180
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181
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182 /* Iterates over the types in the structure that represents the class
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183 encoding and sets the bits in mask according to each ivar type. */
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184 static void
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185 __objc_gc_type_description_from_type (GC_bitmap mask, const char *type)
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186 {
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187 struct objc_struct_layout layout;
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188 unsigned int offset, align;
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189 const char *ivar_type;
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190
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191 objc_layout_structure (type, &layout);
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192
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193 while (objc_layout_structure_next_member (&layout))
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194 {
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195 BOOL gc_invisible = NO;
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196
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197 objc_layout_structure_get_info (&layout, &offset, &align, &ivar_type);
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198
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199 /* Skip the variable name */
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200 if (*ivar_type == '"')
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201 {
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202 for (ivar_type++; *ivar_type++ != '"';)
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203 /* do nothing */;
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204 }
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205
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206 if (*ivar_type == _C_GCINVISIBLE)
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207 {
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208 gc_invisible = YES;
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209 ivar_type++;
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210 }
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211
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212 switch (*ivar_type) {
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213 case _C_ID:
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214 case _C_CLASS:
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215 case _C_SEL:
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216 case _C_PTR:
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217 case _C_CHARPTR:
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218 if (! gc_invisible)
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219 SET_BIT_FOR_OFFSET (mask, offset);
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220 break;
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221
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222 case _C_ARY_B:
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223 __objc_gc_setup_array (mask, ivar_type, offset);
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224 break;
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225
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226 case _C_STRUCT_B:
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227 __objc_gc_setup_struct (mask, ivar_type, offset);
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228 break;
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229
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230 case _C_UNION_B:
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231 __objc_gc_setup_union (mask, ivar_type, offset);
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232 break;
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233
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234 default:
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235 break;
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236 }
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237 }
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238 }
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239
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240 /* Computes in *type the full type encoding of this class including
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241 its super classes. '*size' gives the total number of bytes allocated
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242 into *type, '*current' the number of bytes used so far by the
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243 encoding. */
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244 static void
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245 __objc_class_structure_encoding (Class class, char **type, int *size,
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246 int *current)
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247 {
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248 int i, ivar_count;
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249 struct objc_ivar_list *ivars;
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250
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251 if (! class)
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252 {
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253 strcat (*type, "{");
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254 (*current)++;
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255 return;
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256 }
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257
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258 /* Add the type encodings of the super classes */
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259 __objc_class_structure_encoding (class->super_class, type, size, current);
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260
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261 ivars = class->ivars;
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262 if (! ivars)
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263 return;
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264
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265 ivar_count = ivars->ivar_count;
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266
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267 for (i = 0; i < ivar_count; i++)
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268 {
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269 struct objc_ivar *ivar = &(ivars->ivar_list[i]);
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270 const char *ivar_type = ivar->ivar_type;
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271 int len = strlen (ivar_type);
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272
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273 if (*current + len + 1 >= *size)
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274 {
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275 /* Increase the size of the encoding string so that it
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276 contains this ivar's type. */
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277 *size = ROUND (*current + len + 1, 10);
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278 *type = objc_realloc (*type, *size);
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279 }
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280 strcat (*type + *current, ivar_type);
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281 *current += len;
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282 }
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283 }
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284
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285
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286 /* Allocates the memory that will hold the type description for class
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287 and calls the __objc_class_structure_encoding that generates this
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288 value. */
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289 void
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290 __objc_generate_gc_type_description (Class class)
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291 {
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292 GC_bitmap mask;
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293 int bits_no, size;
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294 int type_size = 10, current;
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295 char *class_structure_type;
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296
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297 if (! CLS_ISCLASS (class))
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298 return;
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299
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300 /* We have to create a mask in which each bit counts for a pointer member.
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301 We take into consideration all the non-pointer instance variables and we
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302 round them up to the alignment. */
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303
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304 /* The number of bits in the mask is the size of an instance in bytes divided
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305 by the size of a pointer. */
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306 bits_no = (ROUND (class_getInstanceSize (class), sizeof (void *))
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307 / sizeof (void *));
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308 size = ROUND (bits_no, BITS_PER_WORD) / BITS_PER_WORD;
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309 mask = objc_atomic_malloc (size * sizeof (int));
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310 memset (mask, 0, size * sizeof (int));
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311
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312 class_structure_type = objc_atomic_malloc (type_size);
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313 *class_structure_type = current = 0;
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314 __objc_class_structure_encoding (class, &class_structure_type,
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315 &type_size, ¤t);
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316 if (current + 1 == type_size)
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317 class_structure_type = objc_realloc (class_structure_type, ++type_size);
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318 strcat (class_structure_type + current, "}");
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319 #ifdef DEBUG
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320 printf ("type description for '%s' is %s\n", class->name, class_structure_type);
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321 #endif
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322
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323 __objc_gc_type_description_from_type (mask, class_structure_type);
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324 objc_free (class_structure_type);
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325
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326 #ifdef DEBUG
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327 printf (" mask for '%s', type '%s' (bits %d, mask size %d) is:",
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328 class_structure_type, class->name, bits_no, size);
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329 {
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330 int i;
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331 for (i = 0; i < size; i++)
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332 printf (" %lx", mask[i]);
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333 }
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334 puts ("");
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335 #endif
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336
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337 class->gc_object_type = (void *) GC_make_descriptor (mask, bits_no);
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338 }
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339
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340
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341 /* Returns YES if type denotes a pointer type, NO otherwise */
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342 static inline BOOL
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343 __objc_ivar_pointer (const char *type)
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344 {
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345 type = objc_skip_type_qualifiers (type);
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346
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347 return (*type == _C_ID
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348 || *type == _C_CLASS
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349 || *type == _C_SEL
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350 || *type == _C_PTR
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351 || *type == _C_CHARPTR
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352 || *type == _C_ATOM);
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353 }
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354
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355
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356 /* Mark the instance variable whose name is given by ivarname as a
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357 weak pointer (a pointer hidden to the garbage collector) if
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358 gc_invisible is true. If gc_invisible is false it unmarks the
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359 instance variable and makes it a normal pointer, visible to the
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360 garbage collector.
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361
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362 This operation only makes sense on instance variables that are
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363 pointers. */
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364 void
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365 class_ivar_set_gcinvisible (Class class, const char *ivarname,
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366 BOOL gc_invisible)
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367 {
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368 int i, ivar_count;
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369 struct objc_ivar_list *ivars;
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370
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371 if (! class || ! ivarname)
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372 return;
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373
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374 ivars = class->ivars;
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375 if (! ivars)
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376 return;
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377
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378 ivar_count = ivars->ivar_count;
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379
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380 for (i = 0; i < ivar_count; i++)
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381 {
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382 struct objc_ivar *ivar = &(ivars->ivar_list[i]);
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383 const char *type;
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384
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385 if (! ivar->ivar_name || strcmp (ivar->ivar_name, ivarname))
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386 continue;
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387
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388 assert (ivar->ivar_type);
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389 type = ivar->ivar_type;
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390
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391 /* Skip the variable name */
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392 if (*type == '"')
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393 {
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394 for (type++; *type++ != '"';)
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395 /* do nothing */;
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396 }
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397
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398 if (*type == _C_GCINVISIBLE)
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399 {
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400 char *new_type;
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401 size_t len;
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402
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403 if (gc_invisible || ! __objc_ivar_pointer (type))
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404 return; /* The type of the variable already matches the
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405 requested gc_invisible type */
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406
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407 /* The variable is gc_invisible so we make it gc visible. */
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408 new_type = objc_atomic_malloc (strlen(ivar->ivar_type));
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409 len = (type - ivar->ivar_type);
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410 memcpy (new_type, ivar->ivar_type, len);
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411 new_type[len] = 0;
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412 strcat (new_type, type + 1);
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413 ivar->ivar_type = new_type;
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414 }
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415 else
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416 {
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417 char *new_type;
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418 size_t len;
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419
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420 if (! gc_invisible || ! __objc_ivar_pointer (type))
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421 return; /* The type of the variable already matches the
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422 requested gc_invisible type */
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423
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424 /* The variable is gc visible so we make it gc_invisible. */
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425 new_type = objc_malloc (strlen(ivar->ivar_type) + 2);
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426
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427 /* Copy the variable name. */
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428 len = (type - ivar->ivar_type);
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429 memcpy (new_type, ivar->ivar_type, len);
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430 /* Add '!'. */
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431 new_type[len++] = _C_GCINVISIBLE;
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432 /* Copy the original types. */
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433 strcpy (new_type + len, type);
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434
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435 ivar->ivar_type = new_type;
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436 }
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437
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438 __objc_generate_gc_type_description (class);
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439 return;
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440 }
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441
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442 /* Search the instance variable in the superclasses */
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443 class_ivar_set_gcinvisible (class->super_class, ivarname, gc_invisible);
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444 }
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445
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446 #else /* !OBJC_WITH_GC */
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447
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448 void
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449 __objc_generate_gc_type_description (Class class __attribute__ ((__unused__)))
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450 {
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451 }
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452
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453 void class_ivar_set_gcinvisible (Class class __attribute__ ((__unused__)),
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454 const char *ivarname __attribute__ ((__unused__)),
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455 BOOL gc_invisible __attribute__ ((__unused__)))
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456 {
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457 }
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458
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459 #endif /* OBJC_WITH_GC */
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