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111
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1 /* The implementation of exception handling primitives for Objective-C.
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145
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2 Copyright (C) 2004-2020 Free Software Foundation, Inc.
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111
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 3, or (at your option) any
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9 later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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14 License for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 #include "objc-private/common.h"
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26 #include <stdlib.h>
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27 #include "config.h"
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28 #include "objc/runtime.h"
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29 #include "objc/objc-exception.h"
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30 #include "unwind.h"
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31 #include "unwind-pe.h"
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32 #include <string.h> /* For memcpy */
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33
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34 /* 'is_kind_of_exception_matcher' is our default exception matcher -
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35 it determines if the object 'exception' is of class 'catch_class',
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36 or of a subclass. */
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37 static int
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38 is_kind_of_exception_matcher (Class catch_class, id exception)
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39 {
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40 /* NULL catch_class is catch-all (eg, @catch (id object)). */
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41 if (catch_class == Nil)
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42 return 1;
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43
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44 /* If exception is nil (eg, @throw nil;), then it can only be
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45 catched by a catch-all (eg, @catch (id object)). */
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46 if (exception != nil)
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47 {
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48 Class c;
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49
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50 for (c = exception->class_pointer; c != Nil;
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51 c = class_getSuperclass (c))
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52 if (c == catch_class)
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53 return 1;
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54 }
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55 return 0;
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56 }
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57
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58 /* The exception matcher currently in use. */
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59 static objc_exception_matcher
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60 __objc_exception_matcher = is_kind_of_exception_matcher;
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61
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62 objc_exception_matcher
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63 objc_setExceptionMatcher (objc_exception_matcher new_matcher)
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64 {
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65 objc_exception_matcher old_matcher = __objc_exception_matcher;
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66 __objc_exception_matcher = new_matcher;
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67 return old_matcher;
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68 }
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69
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70 /* The uncaught exception handler currently in use. */
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71 static objc_uncaught_exception_handler
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72 __objc_uncaught_exception_handler = NULL;
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73
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74 objc_uncaught_exception_handler
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75 objc_setUncaughtExceptionHandler (objc_uncaught_exception_handler
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76 new_handler)
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77 {
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78 objc_uncaught_exception_handler old_handler
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79 = __objc_uncaught_exception_handler;
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80 __objc_uncaught_exception_handler = new_handler;
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81 return old_handler;
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82 }
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83
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84
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85
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86 #ifdef __ARM_EABI_UNWINDER__
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87
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88 const _Unwind_Exception_Class __objc_exception_class
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89 = {'G', 'N', 'U', 'C', 'O', 'B', 'J', 'C'};
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90
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91 #else
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92
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93 /* This is the exception class we report -- "GNUCOBJC". */
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94 static const _Unwind_Exception_Class __objc_exception_class
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95 = ((((((((_Unwind_Exception_Class) 'G'
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96 << 8 | (_Unwind_Exception_Class) 'N')
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97 << 8 | (_Unwind_Exception_Class) 'U')
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98 << 8 | (_Unwind_Exception_Class) 'C')
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99 << 8 | (_Unwind_Exception_Class) 'O')
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100 << 8 | (_Unwind_Exception_Class) 'B')
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101 << 8 | (_Unwind_Exception_Class) 'J')
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102 << 8 | (_Unwind_Exception_Class) 'C');
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103
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104 #endif
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105
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106 /* This is the object that is passed around by the Objective C runtime
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107 to represent the exception in flight. */
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108 struct ObjcException
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109 {
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110 /* This bit is needed in order to interact with the unwind runtime. */
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111 struct _Unwind_Exception base;
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112
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113 /* The actual object we want to throw. Note: must come immediately
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114 after unwind header. */
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115 id value;
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116
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117 #ifdef __ARM_EABI_UNWINDER__
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118 /* Note: we use the barrier cache defined in the unwind control
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119 block for ARM EABI. */
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120 #else
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121 /* Cache some internal unwind data between phase 1 and phase 2. */
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122 _Unwind_Ptr landingPad;
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123 int handlerSwitchValue;
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124 #endif
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125 };
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126
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127
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128
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129 struct lsda_header_info
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130 {
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131 _Unwind_Ptr Start;
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132 _Unwind_Ptr LPStart;
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133 _Unwind_Ptr ttype_base;
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134 const unsigned char *TType;
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135 const unsigned char *action_table;
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136 unsigned char ttype_encoding;
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137 unsigned char call_site_encoding;
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138 };
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139
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140 static const unsigned char *
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141 parse_lsda_header (struct _Unwind_Context *context, const unsigned char *p,
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142 struct lsda_header_info *info)
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143 {
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144 _uleb128_t tmp;
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145 unsigned char lpstart_encoding;
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146
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147 info->Start = (context ? _Unwind_GetRegionStart (context) : 0);
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148
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149 /* Find @LPStart, the base to which landing pad offsets are
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150 relative. */
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151 lpstart_encoding = *p++;
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152 if (lpstart_encoding != DW_EH_PE_omit)
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153 p = read_encoded_value (context, lpstart_encoding, p, &info->LPStart);
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154 else
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155 info->LPStart = info->Start;
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156
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157 /* Find @TType, the base of the handler and exception spec type
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158 data. */
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159 info->ttype_encoding = *p++;
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160 if (info->ttype_encoding != DW_EH_PE_omit)
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161 {
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162 #if _GLIBCXX_OVERRIDE_TTYPE_ENCODING
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163 /* Older ARM EABI toolchains set this value incorrectly, so use a
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164 hardcoded OS-specific format. */
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165 info->ttype_encoding = _GLIBCXX_OVERRIDE_TTYPE_ENCODING;
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166 #endif
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167 p = read_uleb128 (p, &tmp);
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168 info->TType = p + tmp;
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169 }
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170 else
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171 info->TType = 0;
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172
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173 /* The encoding and length of the call-site table; the action table
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174 immediately follows. */
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175 info->call_site_encoding = *p++;
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176 p = read_uleb128 (p, &tmp);
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177 info->action_table = p + tmp;
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178
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179 return p;
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180 }
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181
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182 static Class
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183 get_ttype_entry (struct lsda_header_info *info, _Unwind_Word i)
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184 {
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185 _Unwind_Ptr ptr;
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186
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187 i *= size_of_encoded_value (info->ttype_encoding);
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188 read_encoded_value_with_base (info->ttype_encoding, info->ttype_base,
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189 info->TType - i, &ptr);
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190
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191 /* NULL ptr means catch-all. Note that if the class is not found,
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192 this will abort the program. */
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193 if (ptr)
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194 return objc_getRequiredClass ((const char *) ptr);
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195 else
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196 return 0;
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197 }
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198
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199 /* Using a different personality function name causes link failures
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200 when trying to mix code using different exception handling
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201 models. */
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202 #ifdef __USING_SJLJ_EXCEPTIONS__
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203 #define PERSONALITY_FUNCTION __gnu_objc_personality_sj0
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204 #define __builtin_eh_return_data_regno(x) x
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205 #elif defined(__SEH__)
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206 #define PERSONALITY_FUNCTION __gnu_objc_personality_imp
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207 #else
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208 #define PERSONALITY_FUNCTION __gnu_objc_personality_v0
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209 #endif
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210
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211 #ifdef __ARM_EABI_UNWINDER__
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212
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213 #define CONTINUE_UNWINDING \
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214 do \
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215 { \
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216 if (__gnu_unwind_frame(ue_header, context) != _URC_OK) \
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217 return _URC_FAILURE; \
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218 return _URC_CONTINUE_UNWIND; \
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219 } \
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220 while (0)
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221
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222 _Unwind_Reason_Code
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145
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223 __attribute__((target ("general-regs-only")))
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111
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224 PERSONALITY_FUNCTION (_Unwind_State state,
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225 struct _Unwind_Exception *ue_header,
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226 struct _Unwind_Context *context)
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227 #else
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228
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229 #define CONTINUE_UNWINDING return _URC_CONTINUE_UNWIND
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230
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231 #if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__)
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232 static
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233 #endif
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234 _Unwind_Reason_Code
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235 PERSONALITY_FUNCTION (int version,
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236 _Unwind_Action actions,
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237 _Unwind_Exception_Class exception_class,
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238 struct _Unwind_Exception *ue_header,
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239 struct _Unwind_Context *context)
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240 #endif
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241 {
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242 struct ObjcException *xh = (struct ObjcException *) ue_header;
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243
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244 struct lsda_header_info info;
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245 const unsigned char *language_specific_data;
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246 const unsigned char *action_record;
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247 const unsigned char *p;
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248 _Unwind_Ptr landing_pad, ip;
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249 int handler_switch_value;
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250 int saw_cleanup = 0, saw_handler, foreign_exception;
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251 void *return_object;
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252 int ip_before_insn = 0;
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253
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254 #ifdef __ARM_EABI_UNWINDER__
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255 _Unwind_Action actions;
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256
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257 switch (state & _US_ACTION_MASK)
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258 {
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259 case _US_VIRTUAL_UNWIND_FRAME:
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260 actions = _UA_SEARCH_PHASE;
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261 break;
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262
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263 case _US_UNWIND_FRAME_STARTING:
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264 actions = _UA_CLEANUP_PHASE;
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265 if (!(state & _US_FORCE_UNWIND)
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266 && ue_header->barrier_cache.sp == _Unwind_GetGR (context, 13))
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267 actions |= _UA_HANDLER_FRAME;
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268 break;
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269
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270 case _US_UNWIND_FRAME_RESUME:
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271 CONTINUE_UNWINDING;
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272 break;
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273
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274 default:
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275 abort();
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276 }
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277 actions |= state & _US_FORCE_UNWIND;
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278
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279 /* TODO: Foreign exceptions need some attention (e.g. rethrowing
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280 doesn't work). */
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281 foreign_exception = 0;
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282
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283 /* The dwarf unwinder assumes the context structure holds things
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284 like the function and LSDA pointers. The ARM implementation
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285 caches these in the exception header (UCB). To avoid rewriting
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286 everything we make the virtual IP register point at the UCB. */
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287 ip = (_Unwind_Ptr) ue_header;
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288 _Unwind_SetGR (context, 12, ip);
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289
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290 #else /* !__ARM_EABI_UNWINDER. */
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291 /* Interface version check. */
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292 if (version != 1)
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293 return _URC_FATAL_PHASE1_ERROR;
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294
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295 foreign_exception = (exception_class != __objc_exception_class);
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296 #endif
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297
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298 /* Shortcut for phase 2 found handler for domestic exception. */
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299 if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME)
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300 && !foreign_exception)
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301 {
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302 #ifdef __ARM_EABI_UNWINDER__
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303 handler_switch_value = (int) ue_header->barrier_cache.bitpattern[1];
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304 landing_pad = (_Unwind_Ptr) ue_header->barrier_cache.bitpattern[3];
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305 #else
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306 handler_switch_value = xh->handlerSwitchValue;
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307 landing_pad = xh->landingPad;
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308 #endif
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309 goto install_context;
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310 }
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311
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312 language_specific_data = (const unsigned char *)
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313 _Unwind_GetLanguageSpecificData (context);
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314
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315 /* If no LSDA, then there are no handlers or cleanups. */
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316 if (! language_specific_data)
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317 CONTINUE_UNWINDING;
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318
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319 /* Parse the LSDA header. */
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320 p = parse_lsda_header (context, language_specific_data, &info);
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321 info.ttype_base = base_of_encoded_value (info.ttype_encoding, context);
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322 #ifdef HAVE_GETIPINFO
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323 ip = _Unwind_GetIPInfo (context, &ip_before_insn);
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324 #else
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325 ip = _Unwind_GetIP (context);
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326 #endif
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327 if (!ip_before_insn)
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328 --ip;
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329 landing_pad = 0;
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330 action_record = 0;
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331 handler_switch_value = 0;
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332
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333 #ifdef __USING_SJLJ_EXCEPTIONS__
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334 /* The given "IP" is an index into the call-site table, with two
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335 exceptions -- -1 means no-action, and 0 means terminate. But
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336 since we're using uleb128 values, we've not got random access to
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337 the array. */
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338 if ((int) ip < 0)
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339 return _URC_CONTINUE_UNWIND;
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340 else
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341 {
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342 _uleb128_t cs_lp, cs_action;
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343 do
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344 {
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345 p = read_uleb128 (p, &cs_lp);
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346 p = read_uleb128 (p, &cs_action);
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347 }
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348 while (--ip);
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349
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350 /* Can never have null landing pad for sjlj -- that would have
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351 been indicated by a -1 call site index. */
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352 landing_pad = cs_lp + 1;
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353 if (cs_action)
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354 action_record = info.action_table + cs_action - 1;
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355 goto found_something;
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356 }
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357 #else
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358 /* Search the call-site table for the action associated with this
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359 IP. */
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360 while (p < info.action_table)
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361 {
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362 _Unwind_Ptr cs_start, cs_len, cs_lp;
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363 _uleb128_t cs_action;
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364
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365 /* Note that all call-site encodings are "absolute"
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366 displacements. */
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367 p = read_encoded_value (0, info.call_site_encoding, p, &cs_start);
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368 p = read_encoded_value (0, info.call_site_encoding, p, &cs_len);
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369 p = read_encoded_value (0, info.call_site_encoding, p, &cs_lp);
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370 p = read_uleb128 (p, &cs_action);
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371
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372 /* The table is sorted, so if we've passed the ip, stop. */
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373 if (ip < info.Start + cs_start)
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374 p = info.action_table;
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375 else if (ip < info.Start + cs_start + cs_len)
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376 {
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377 if (cs_lp)
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378 landing_pad = info.LPStart + cs_lp;
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379 if (cs_action)
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380 action_record = info.action_table + cs_action - 1;
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381 goto found_something;
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382 }
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383 }
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384 #endif /* __USING_SJLJ_EXCEPTIONS__ */
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385
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386 /* If ip is not present in the table, C++ would call terminate. */
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387 /* ??? As with Java, it's perhaps better to tweek the LSDA to that
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388 no-action is mapped to no-entry. */
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389 CONTINUE_UNWINDING;
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390
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391 found_something:
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392 saw_cleanup = 0;
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393 saw_handler = 0;
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394
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395 if (landing_pad == 0)
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396 {
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397 /* If ip is present, and has a null landing pad, there are no
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398 cleanups or handlers to be run. */
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399 }
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400 else if (action_record == 0)
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401 {
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402 /* If ip is present, has a non-null landing pad, and a null
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403 action table offset, then there are only cleanups present.
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404 Cleanups use a zero switch value, as set above. */
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405 saw_cleanup = 1;
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406 }
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|
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407 else
|
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408 {
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|
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409 /* Otherwise we have a catch handler. */
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|
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410 _sleb128_t ar_filter, ar_disp;
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411
|
|
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412 while (1)
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413 {
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414 p = action_record;
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415 p = read_sleb128 (p, &ar_filter);
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416 read_sleb128 (p, &ar_disp);
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417
|
|
|
418 if (ar_filter == 0)
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|
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419 {
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|
|
420 /* Zero filter values are cleanups. */
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|
|
421 saw_cleanup = 1;
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|
|
422 }
|
|
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423
|
|
|
424 /* During forced unwinding, we only run cleanups. With a
|
|
|
425 foreign exception class, we have no class info to
|
|
|
426 match. */
|
|
|
427 else if ((actions & _UA_FORCE_UNWIND) || foreign_exception)
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|
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428 ;
|
|
|
429
|
|
|
430 else if (ar_filter > 0)
|
|
|
431 {
|
|
|
432 /* Positive filter values are handlers. */
|
|
|
433 Class catch_type = get_ttype_entry (&info, ar_filter);
|
|
|
434
|
|
|
435 if ((*__objc_exception_matcher) (catch_type, xh->value))
|
|
|
436 {
|
|
|
437 handler_switch_value = ar_filter;
|
|
|
438 saw_handler = 1;
|
|
|
439 break;
|
|
|
440 }
|
|
|
441 }
|
|
|
442 else
|
|
|
443 {
|
|
|
444 /* Negative filter values are exception specifications,
|
|
|
445 which Objective-C does not use. */
|
|
|
446 abort ();
|
|
|
447 }
|
|
|
448
|
|
|
449 if (ar_disp == 0)
|
|
|
450 break;
|
|
|
451 action_record = p + ar_disp;
|
|
|
452 }
|
|
|
453 }
|
|
|
454
|
|
|
455 if (! saw_handler && ! saw_cleanup)
|
|
|
456 CONTINUE_UNWINDING;
|
|
|
457
|
|
|
458 if (actions & _UA_SEARCH_PHASE)
|
|
|
459 {
|
|
|
460 if (!saw_handler)
|
|
|
461 CONTINUE_UNWINDING;
|
|
|
462
|
|
|
463 /* For domestic exceptions, we cache data from phase 1 for phase
|
|
|
464 2. */
|
|
|
465 if (!foreign_exception)
|
|
|
466 {
|
|
|
467 #ifdef __ARM_EABI_UNWINDER__
|
|
|
468 ue_header->barrier_cache.sp = _Unwind_GetGR (context, 13);
|
|
|
469 ue_header->barrier_cache.bitpattern[1] = (_uw) handler_switch_value;
|
|
|
470 ue_header->barrier_cache.bitpattern[3] = (_uw) landing_pad;
|
|
|
471 #else
|
|
|
472 xh->handlerSwitchValue = handler_switch_value;
|
|
|
473 xh->landingPad = landing_pad;
|
|
|
474 #endif
|
|
|
475 }
|
|
|
476 return _URC_HANDLER_FOUND;
|
|
|
477 }
|
|
|
478
|
|
|
479 install_context:
|
|
|
480 if (saw_cleanup == 0)
|
|
|
481 {
|
|
|
482 return_object = xh->value;
|
|
|
483 if (!(actions & _UA_SEARCH_PHASE))
|
|
|
484 _Unwind_DeleteException(&xh->base);
|
|
|
485 }
|
|
|
486
|
|
|
487 _Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
|
|
|
488 __builtin_extend_pointer (saw_cleanup ? xh : return_object));
|
|
|
489 _Unwind_SetGR (context, __builtin_eh_return_data_regno (1),
|
|
|
490 handler_switch_value);
|
|
|
491 _Unwind_SetIP (context, landing_pad);
|
|
|
492 return _URC_INSTALL_CONTEXT;
|
|
|
493 }
|
|
|
494
|
|
|
495 static void
|
|
|
496 __objc_exception_cleanup (_Unwind_Reason_Code code __attribute__((unused)),
|
|
|
497 struct _Unwind_Exception *exc)
|
|
|
498 {
|
|
|
499 free (exc);
|
|
|
500 }
|
|
|
501
|
|
|
502 void
|
|
|
503 objc_exception_throw (id exception)
|
|
|
504 {
|
|
|
505 struct ObjcException *header = calloc (1, sizeof (*header));
|
|
|
506
|
|
|
507 memcpy (&header->base.exception_class, &__objc_exception_class,
|
|
|
508 sizeof (__objc_exception_class));
|
|
|
509 header->base.exception_cleanup = __objc_exception_cleanup;
|
|
|
510 header->value = exception;
|
|
|
511
|
|
|
512 #ifdef __USING_SJLJ_EXCEPTIONS__
|
|
|
513 _Unwind_SjLj_RaiseException (&header->base);
|
|
|
514 #else
|
|
|
515 _Unwind_RaiseException (&header->base);
|
|
|
516 #endif
|
|
|
517
|
|
|
518 /* No exception handler was installed. Call the uncaught exception
|
|
|
519 handler if any is defined. */
|
|
|
520 if (__objc_uncaught_exception_handler != 0)
|
|
|
521 {
|
|
|
522 (*__objc_uncaught_exception_handler) (exception);
|
|
|
523 }
|
|
|
524
|
|
|
525 abort ();
|
|
|
526 }
|
|
|
527
|
|
|
528 #if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__)
|
|
|
529 EXCEPTION_DISPOSITION
|
|
|
530 __gnu_objc_personality_seh0 (PEXCEPTION_RECORD ms_exc, void *this_frame,
|
|
|
531 PCONTEXT ms_orig_context,
|
|
|
532 PDISPATCHER_CONTEXT ms_disp)
|
|
|
533 {
|
|
|
534 return _GCC_specific_handler (ms_exc, this_frame, ms_orig_context,
|
|
|
535 ms_disp, __gnu_objc_personality_imp);
|
|
|
536 }
|
|
|
537 #endif
|
