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111
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1 /* The implementation of exception handling primitives for Objective-C.
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131
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2 Copyright (C) 2004-2018 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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223 PERSONALITY_FUNCTION (_Unwind_State state,
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224 struct _Unwind_Exception *ue_header,
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225 struct _Unwind_Context *context)
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226 #else
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227
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228 #define CONTINUE_UNWINDING return _URC_CONTINUE_UNWIND
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229
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230 #if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__)
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231 static
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232 #endif
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233 _Unwind_Reason_Code
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234 PERSONALITY_FUNCTION (int version,
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235 _Unwind_Action actions,
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236 _Unwind_Exception_Class exception_class,
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237 struct _Unwind_Exception *ue_header,
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238 struct _Unwind_Context *context)
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239 #endif
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240 {
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241 struct ObjcException *xh = (struct ObjcException *) ue_header;
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242
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243 struct lsda_header_info info;
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244 const unsigned char *language_specific_data;
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245 const unsigned char *action_record;
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246 const unsigned char *p;
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247 _Unwind_Ptr landing_pad, ip;
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248 int handler_switch_value;
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249 int saw_cleanup = 0, saw_handler, foreign_exception;
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250 void *return_object;
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251 int ip_before_insn = 0;
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252
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253 #ifdef __ARM_EABI_UNWINDER__
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254 _Unwind_Action actions;
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255
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256 switch (state & _US_ACTION_MASK)
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257 {
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258 case _US_VIRTUAL_UNWIND_FRAME:
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259 actions = _UA_SEARCH_PHASE;
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260 break;
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261
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262 case _US_UNWIND_FRAME_STARTING:
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263 actions = _UA_CLEANUP_PHASE;
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264 if (!(state & _US_FORCE_UNWIND)
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265 && ue_header->barrier_cache.sp == _Unwind_GetGR (context, 13))
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266 actions |= _UA_HANDLER_FRAME;
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267 break;
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268
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269 case _US_UNWIND_FRAME_RESUME:
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270 CONTINUE_UNWINDING;
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271 break;
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272
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273 default:
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274 abort();
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275 }
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276 actions |= state & _US_FORCE_UNWIND;
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277
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278 /* TODO: Foreign exceptions need some attention (e.g. rethrowing
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279 doesn't work). */
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280 foreign_exception = 0;
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281
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282 /* The dwarf unwinder assumes the context structure holds things
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283 like the function and LSDA pointers. The ARM implementation
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284 caches these in the exception header (UCB). To avoid rewriting
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285 everything we make the virtual IP register point at the UCB. */
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286 ip = (_Unwind_Ptr) ue_header;
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287 _Unwind_SetGR (context, 12, ip);
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288
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289 #else /* !__ARM_EABI_UNWINDER. */
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290 /* Interface version check. */
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291 if (version != 1)
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292 return _URC_FATAL_PHASE1_ERROR;
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293
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294 foreign_exception = (exception_class != __objc_exception_class);
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295 #endif
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296
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297 /* Shortcut for phase 2 found handler for domestic exception. */
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298 if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME)
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299 && !foreign_exception)
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300 {
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301 #ifdef __ARM_EABI_UNWINDER__
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302 handler_switch_value = (int) ue_header->barrier_cache.bitpattern[1];
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303 landing_pad = (_Unwind_Ptr) ue_header->barrier_cache.bitpattern[3];
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304 #else
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305 handler_switch_value = xh->handlerSwitchValue;
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306 landing_pad = xh->landingPad;
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307 #endif
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308 goto install_context;
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309 }
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310
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311 language_specific_data = (const unsigned char *)
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312 _Unwind_GetLanguageSpecificData (context);
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313
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314 /* If no LSDA, then there are no handlers or cleanups. */
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315 if (! language_specific_data)
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316 CONTINUE_UNWINDING;
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317
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318 /* Parse the LSDA header. */
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319 p = parse_lsda_header (context, language_specific_data, &info);
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320 info.ttype_base = base_of_encoded_value (info.ttype_encoding, context);
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321 #ifdef HAVE_GETIPINFO
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322 ip = _Unwind_GetIPInfo (context, &ip_before_insn);
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323 #else
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324 ip = _Unwind_GetIP (context);
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325 #endif
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326 if (!ip_before_insn)
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327 --ip;
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328 landing_pad = 0;
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329 action_record = 0;
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330 handler_switch_value = 0;
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331
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332 #ifdef __USING_SJLJ_EXCEPTIONS__
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333 /* The given "IP" is an index into the call-site table, with two
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334 exceptions -- -1 means no-action, and 0 means terminate. But
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335 since we're using uleb128 values, we've not got random access to
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336 the array. */
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337 if ((int) ip < 0)
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338 return _URC_CONTINUE_UNWIND;
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339 else
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340 {
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341 _uleb128_t cs_lp, cs_action;
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342 do
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343 {
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344 p = read_uleb128 (p, &cs_lp);
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345 p = read_uleb128 (p, &cs_action);
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346 }
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347 while (--ip);
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348
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349 /* Can never have null landing pad for sjlj -- that would have
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350 been indicated by a -1 call site index. */
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351 landing_pad = cs_lp + 1;
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352 if (cs_action)
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353 action_record = info.action_table + cs_action - 1;
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354 goto found_something;
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355 }
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356 #else
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357 /* Search the call-site table for the action associated with this
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358 IP. */
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359 while (p < info.action_table)
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360 {
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361 _Unwind_Ptr cs_start, cs_len, cs_lp;
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362 _uleb128_t cs_action;
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363
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364 /* Note that all call-site encodings are "absolute"
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365 displacements. */
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366 p = read_encoded_value (0, info.call_site_encoding, p, &cs_start);
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367 p = read_encoded_value (0, info.call_site_encoding, p, &cs_len);
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368 p = read_encoded_value (0, info.call_site_encoding, p, &cs_lp);
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369 p = read_uleb128 (p, &cs_action);
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370
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371 /* The table is sorted, so if we've passed the ip, stop. */
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372 if (ip < info.Start + cs_start)
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373 p = info.action_table;
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374 else if (ip < info.Start + cs_start + cs_len)
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375 {
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376 if (cs_lp)
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377 landing_pad = info.LPStart + cs_lp;
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378 if (cs_action)
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379 action_record = info.action_table + cs_action - 1;
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380 goto found_something;
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381 }
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382 }
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383 #endif /* __USING_SJLJ_EXCEPTIONS__ */
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384
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385 /* If ip is not present in the table, C++ would call terminate. */
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386 /* ??? As with Java, it's perhaps better to tweek the LSDA to that
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387 no-action is mapped to no-entry. */
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388 CONTINUE_UNWINDING;
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389
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390 found_something:
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391 saw_cleanup = 0;
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392 saw_handler = 0;
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393
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394 if (landing_pad == 0)
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395 {
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396 /* If ip is present, and has a null landing pad, there are no
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397 cleanups or handlers to be run. */
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398 }
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399 else if (action_record == 0)
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400 {
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401 /* If ip is present, has a non-null landing pad, and a null
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402 action table offset, then there are only cleanups present.
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403 Cleanups use a zero switch value, as set above. */
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404 saw_cleanup = 1;
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405 }
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|
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406 else
|
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407 {
|
|
|
408 /* Otherwise we have a catch handler. */
|
|
|
409 _sleb128_t ar_filter, ar_disp;
|
|
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410
|
|
|
411 while (1)
|
|
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412 {
|
|
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413 p = action_record;
|
|
|
414 p = read_sleb128 (p, &ar_filter);
|
|
|
415 read_sleb128 (p, &ar_disp);
|
|
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416
|
|
|
417 if (ar_filter == 0)
|
|
|
418 {
|
|
|
419 /* Zero filter values are cleanups. */
|
|
|
420 saw_cleanup = 1;
|
|
|
421 }
|
|
|
422
|
|
|
423 /* During forced unwinding, we only run cleanups. With a
|
|
|
424 foreign exception class, we have no class info to
|
|
|
425 match. */
|
|
|
426 else if ((actions & _UA_FORCE_UNWIND) || foreign_exception)
|
|
|
427 ;
|
|
|
428
|
|
|
429 else if (ar_filter > 0)
|
|
|
430 {
|
|
|
431 /* Positive filter values are handlers. */
|
|
|
432 Class catch_type = get_ttype_entry (&info, ar_filter);
|
|
|
433
|
|
|
434 if ((*__objc_exception_matcher) (catch_type, xh->value))
|
|
|
435 {
|
|
|
436 handler_switch_value = ar_filter;
|
|
|
437 saw_handler = 1;
|
|
|
438 break;
|
|
|
439 }
|
|
|
440 }
|
|
|
441 else
|
|
|
442 {
|
|
|
443 /* Negative filter values are exception specifications,
|
|
|
444 which Objective-C does not use. */
|
|
|
445 abort ();
|
|
|
446 }
|
|
|
447
|
|
|
448 if (ar_disp == 0)
|
|
|
449 break;
|
|
|
450 action_record = p + ar_disp;
|
|
|
451 }
|
|
|
452 }
|
|
|
453
|
|
|
454 if (! saw_handler && ! saw_cleanup)
|
|
|
455 CONTINUE_UNWINDING;
|
|
|
456
|
|
|
457 if (actions & _UA_SEARCH_PHASE)
|
|
|
458 {
|
|
|
459 if (!saw_handler)
|
|
|
460 CONTINUE_UNWINDING;
|
|
|
461
|
|
|
462 /* For domestic exceptions, we cache data from phase 1 for phase
|
|
|
463 2. */
|
|
|
464 if (!foreign_exception)
|
|
|
465 {
|
|
|
466 #ifdef __ARM_EABI_UNWINDER__
|
|
|
467 ue_header->barrier_cache.sp = _Unwind_GetGR (context, 13);
|
|
|
468 ue_header->barrier_cache.bitpattern[1] = (_uw) handler_switch_value;
|
|
|
469 ue_header->barrier_cache.bitpattern[3] = (_uw) landing_pad;
|
|
|
470 #else
|
|
|
471 xh->handlerSwitchValue = handler_switch_value;
|
|
|
472 xh->landingPad = landing_pad;
|
|
|
473 #endif
|
|
|
474 }
|
|
|
475 return _URC_HANDLER_FOUND;
|
|
|
476 }
|
|
|
477
|
|
|
478 install_context:
|
|
|
479 if (saw_cleanup == 0)
|
|
|
480 {
|
|
|
481 return_object = xh->value;
|
|
|
482 if (!(actions & _UA_SEARCH_PHASE))
|
|
|
483 _Unwind_DeleteException(&xh->base);
|
|
|
484 }
|
|
|
485
|
|
|
486 _Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
|
|
|
487 __builtin_extend_pointer (saw_cleanup ? xh : return_object));
|
|
|
488 _Unwind_SetGR (context, __builtin_eh_return_data_regno (1),
|
|
|
489 handler_switch_value);
|
|
|
490 _Unwind_SetIP (context, landing_pad);
|
|
|
491 return _URC_INSTALL_CONTEXT;
|
|
|
492 }
|
|
|
493
|
|
|
494 static void
|
|
|
495 __objc_exception_cleanup (_Unwind_Reason_Code code __attribute__((unused)),
|
|
|
496 struct _Unwind_Exception *exc)
|
|
|
497 {
|
|
|
498 free (exc);
|
|
|
499 }
|
|
|
500
|
|
|
501 void
|
|
|
502 objc_exception_throw (id exception)
|
|
|
503 {
|
|
|
504 struct ObjcException *header = calloc (1, sizeof (*header));
|
|
|
505
|
|
|
506 memcpy (&header->base.exception_class, &__objc_exception_class,
|
|
|
507 sizeof (__objc_exception_class));
|
|
|
508 header->base.exception_cleanup = __objc_exception_cleanup;
|
|
|
509 header->value = exception;
|
|
|
510
|
|
|
511 #ifdef __USING_SJLJ_EXCEPTIONS__
|
|
|
512 _Unwind_SjLj_RaiseException (&header->base);
|
|
|
513 #else
|
|
|
514 _Unwind_RaiseException (&header->base);
|
|
|
515 #endif
|
|
|
516
|
|
|
517 /* No exception handler was installed. Call the uncaught exception
|
|
|
518 handler if any is defined. */
|
|
|
519 if (__objc_uncaught_exception_handler != 0)
|
|
|
520 {
|
|
|
521 (*__objc_uncaught_exception_handler) (exception);
|
|
|
522 }
|
|
|
523
|
|
|
524 abort ();
|
|
|
525 }
|
|
|
526
|
|
|
527 #if defined (__SEH__) && !defined (__USING_SJLJ_EXCEPTIONS__)
|
|
|
528 EXCEPTION_DISPOSITION
|
|
|
529 __gnu_objc_personality_seh0 (PEXCEPTION_RECORD ms_exc, void *this_frame,
|
|
|
530 PCONTEXT ms_orig_context,
|
|
|
531 PDISPATCHER_CONTEXT ms_disp)
|
|
|
532 {
|
|
|
533 return _GCC_specific_handler (ms_exc, this_frame, ms_orig_context,
|
|
|
534 ms_disp, __gnu_objc_personality_imp);
|
|
|
535 }
|
|
|
536 #endif
|
