1 | #include "exception.h" |
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2 | |
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3 | // Use: gcc -fexceptions -Wall -Werror -g exception.c test-main.c |
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4 | |
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5 | #include <stdio.h> |
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6 | #include <stdbool.h> |
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7 | |
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8 | // Translation Helpers: |
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9 | #define CLEANUP(function) \ |
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10 | struct __cleanup_hook __hidden_hook __attribute__((cleanup(function))) |
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11 | |
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12 | #define SET_UP_RESUME_NODE(handler_function) \ |
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13 | struct __try_resume_node node \ |
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14 | __attribute__((cleanup(__try_resume_node_delete))); \ |
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15 | __try_resume_node_new(&node, handler_function) |
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16 | |
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17 | void __try_resume_node_new(struct __try_resume_node * node, |
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18 | _Bool (*handler)(exception except)) { |
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19 | node->next = shared_stack.top_resume; |
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20 | shared_stack.top_resume = node; |
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21 | node->try_to_handle = handler; |
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22 | } |
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23 | |
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24 | void __try_resume_node_delete(struct __try_resume_node * node) { |
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25 | shared_stack.top_resume = node->next; |
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26 | } |
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27 | |
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28 | // Local Print On Exit: |
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29 | struct raii_base_type { |
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30 | const char * area; |
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31 | }; |
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32 | |
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33 | void raii_dtor(struct raii_base_type * this) { |
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34 | printf("Exiting: %s\n", this->area); |
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35 | } |
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36 | |
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37 | #define raii_t __attribute__((cleanup(raii_dtor))) struct raii_base_type |
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38 | |
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39 | // =========================================================================== |
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40 | // Runtime code (post-translation). |
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41 | void terminate(int except_value) { |
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42 | raii_t a = {"terminate function"}; |
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43 | __throw_terminate(except_value); |
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44 | printf("terminate returned\n"); |
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45 | } |
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46 | |
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47 | void resume(int except_value) { |
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48 | raii_t a = {"resume function"}; |
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49 | __throw_resume(except_value); |
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50 | printf("resume returned\n"); |
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51 | } |
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52 | |
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53 | // Termination Test: Two handlers: no catch, catch |
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54 | void bar() { |
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55 | raii_t a = {"bar function"}; |
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56 | { |
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57 | void bar_try1() { |
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58 | terminate(4); |
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59 | } |
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60 | void bar_catch1(int index, exception except) { |
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61 | switch(except) { |
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62 | case 1: |
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63 | printf("bar caught exception 3.\n"); |
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64 | break; |
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65 | default: |
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66 | printf("INVALID INDEX in bar: %d (%d)\n", index, except); |
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67 | } |
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68 | } |
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69 | int bar_match1(exception except) { |
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70 | if (3 == except) { |
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71 | return 1; |
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72 | } else { |
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73 | return 0; |
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74 | } |
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75 | } |
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76 | __try_terminate(bar_try1, bar_catch1, bar_match1); |
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77 | } |
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78 | } |
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79 | |
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80 | void foo() { |
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81 | raii_t a = {"foo function"}; |
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82 | { |
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83 | void foo_try1() { |
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84 | bar(); |
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85 | } |
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86 | void foo_catch1(int index, exception except) { |
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87 | switch(index) { |
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88 | case 1: |
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89 | printf("foo caught exception 4.\n"); |
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90 | break; |
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91 | case 2: |
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92 | printf("foo caught exception 2.\n"); |
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93 | break; |
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94 | default: |
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95 | printf("INVALID INDEX in foo: %d (%d)\n", index, except); |
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96 | } |
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97 | } |
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98 | int foo_match1(exception except) { |
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99 | if (4 == except) { |
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100 | return 1; |
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101 | } else if (2 == except) { |
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102 | return 2; |
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103 | } else { |
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104 | return 0; |
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105 | } |
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106 | } |
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107 | __try_terminate(foo_try1, foo_catch1, foo_match1); |
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108 | } |
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109 | } |
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110 | |
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111 | // Resumption Two Handler Test: no catch, catch. |
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112 | void beta() { |
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113 | raii_t a = {"beta function"}; |
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114 | { |
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115 | bool beta_handle1(exception except) { |
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116 | if (3 == except) { |
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117 | printf("beta caught exception 3\n"); |
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118 | return true; |
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119 | } else { |
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120 | return false; |
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121 | } |
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122 | } |
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123 | struct __try_resume_node node |
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124 | __attribute__((cleanup(__try_resume_node_delete))); |
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125 | __try_resume_node_new(&node, beta_handle1); |
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126 | { |
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127 | resume(4); |
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128 | } |
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129 | } |
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130 | } |
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131 | void alpha() { |
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132 | raii_t a = {"alpha function"}; |
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133 | { |
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134 | bool alpha_handle1(exception except) { |
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135 | if (2 == except) { |
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136 | printf("alpha caught exception 2\n"); |
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137 | return true; |
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138 | } else if (4 == except) { |
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139 | printf("alpha caught exception 4\n"); |
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140 | return true; |
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141 | } else { |
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142 | return false; |
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143 | } |
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144 | } |
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145 | struct __try_resume_node node |
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146 | __attribute__((cleanup(__try_resume_node_delete))); |
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147 | __try_resume_node_new(&node, alpha_handle1); |
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148 | { |
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149 | beta(); |
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150 | } |
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151 | } |
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152 | } |
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153 | |
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154 | // Finally Test: |
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155 | void farewell() { |
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156 | { |
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157 | void farewell_finally1() { |
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158 | printf("See you next time\n"); |
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159 | } |
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160 | struct __cleanup_hook __hidden_hook |
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161 | __attribute__((cleanup(farewell_finally1))); |
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162 | { |
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163 | printf("walk out of farewell\n"); |
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164 | } |
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165 | } |
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166 | } |
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167 | |
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168 | // Resume-to-Terminate Test: |
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169 | void fallback() { |
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170 | { |
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171 | void fallback_try1() { |
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172 | resume(1); |
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173 | } |
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174 | void fallback_catch1(int index, exception except) { |
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175 | switch (index) { |
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176 | case 1: |
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177 | printf("fallback caught termination 1\n"); |
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178 | break; |
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179 | default: |
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180 | printf("INVALID INDEX in fallback: %d (%d)\n", index, except); |
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181 | } |
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182 | } |
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183 | int fallback_match1(exception except) { |
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184 | if (1 == except) { |
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185 | return 1; |
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186 | } else { |
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187 | return 0; |
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188 | } |
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189 | } |
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190 | __try_terminate(fallback_try1, fallback_catch1, fallback_match1); |
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191 | } |
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192 | } |
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193 | |
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194 | // Terminate Throw New Exception: |
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195 | void terminate_swap() { |
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196 | raii_t a = {"terminate_swap"}; |
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197 | { |
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198 | void fn_try1() { |
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199 | terminate(2); |
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200 | } |
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201 | void fn_catch1(int index, exception except) { |
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202 | switch (index) { |
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203 | case 1: |
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204 | terminate(1); |
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205 | break; |
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206 | default: |
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207 | printf("INVALID INDEX in terminate_swap: %d (%d)\n", |
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208 | index, except); |
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209 | } |
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210 | } |
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211 | int fn_match1(exception except) { |
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212 | if (2 == except) { |
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213 | return 1; |
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214 | } else { |
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215 | return 0; |
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216 | } |
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217 | } |
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218 | __try_terminate(fn_try1, fn_catch1, fn_match1); |
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219 | } |
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220 | } |
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221 | |
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222 | void terminate_swapped() { |
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223 | raii_t a = {"terminate_swapped"}; |
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224 | { |
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225 | void fn_try1() { |
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226 | terminate_swap(); |
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227 | } |
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228 | void fn_catch1(int index, exception except) { |
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229 | switch (index) { |
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230 | case 1: |
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231 | printf("terminate_swapped caught exception 1\n"); |
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232 | break; |
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233 | default: |
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234 | printf("INVALID INDEX in terminate_swapped: %d (%d)\n", |
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235 | index, except); |
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236 | } |
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237 | } |
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238 | int fn_match1(exception except) { |
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239 | if (1 == except) { |
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240 | return 1; |
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241 | } else { |
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242 | return 0; |
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243 | } |
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244 | } |
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245 | __try_terminate(fn_try1, fn_catch1, fn_match1); |
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246 | } |
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247 | } |
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248 | |
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249 | // Resume Throw New Exception: |
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250 | void resume_swap() { |
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251 | raii_t a = {"terminate_swap"}; |
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252 | { |
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253 | bool fn_handle1(exception except) { |
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254 | if (2 == except) { |
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255 | resume(1); |
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256 | return true; |
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257 | } else { |
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258 | return false; |
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259 | } |
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260 | } |
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261 | struct __try_resume_node node |
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262 | __attribute__((cleanup(__try_resume_node_delete))); |
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263 | __try_resume_node_new(&node, fn_handle1); |
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264 | { |
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265 | resume(2); |
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266 | } |
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267 | } |
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268 | } |
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269 | |
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270 | void resume_swapped() { |
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271 | { |
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272 | bool fn_handle1(exception except) { |
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273 | if (1 == except) { |
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274 | printf("resume_swapped caught exception 1\n"); |
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275 | return true; |
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276 | } else { |
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277 | return false; |
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278 | } |
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279 | } |
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280 | struct __try_resume_node node |
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281 | __attribute__((cleanup(__try_resume_node_delete))); |
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282 | __try_resume_node_new(&node, fn_handle1); |
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283 | { |
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284 | resume_swap(); |
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285 | } |
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286 | } |
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287 | } |
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288 | |
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289 | // Terminate Rethrow: |
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290 | // I don't have an implementation for this. |
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291 | |
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292 | // Resume Rethrow: |
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293 | void reresume() { |
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294 | { |
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295 | bool reresume_handle1(exception except) { |
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296 | if (1 == except) { |
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297 | printf("reresume 1 caught exception 1\n"); |
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298 | return true; |
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299 | } else { |
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300 | return false; |
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301 | } |
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302 | } |
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303 | struct __try_resume_node node |
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304 | __attribute__((cleanup(__try_resume_node_delete))); |
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305 | __try_resume_node_new(&node, reresume_handle1); |
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306 | { |
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307 | bool reresume_handle2(exception except) { |
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308 | if (1 == except) { |
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309 | printf("reresume 2 caught and rethrows exception 1\n"); |
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310 | return false; |
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311 | } else { |
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312 | return false; |
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313 | } |
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314 | } |
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315 | struct __try_resume_node node |
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316 | __attribute__((cleanup(__try_resume_node_delete))); |
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317 | __try_resume_node_new(&node, reresume_handle2); |
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318 | { |
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319 | resume(1); |
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320 | } |
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321 | } |
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322 | } |
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323 | } |
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324 | |
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325 | // Terminate-Resume interaction: |
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326 | void fum() { |
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327 | // terminate block, call resume |
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328 | { |
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329 | void fum_try1() { |
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330 | resume(3); |
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331 | } |
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332 | void fum_catch1(int index, exception except) { |
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333 | switch (index) { |
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334 | case 1: |
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335 | printf("fum caught exception 3\n"); |
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336 | break; |
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337 | default: |
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338 | printf("INVALID INDEX in fum: %d (%d)\n", index, except); |
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339 | } |
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340 | } |
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341 | int fum_match1(exception except) { |
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342 | if (3 == except) { |
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343 | return 1; |
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344 | } else { |
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345 | return 0; |
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346 | } |
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347 | } |
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348 | __try_terminate(fum_try1, fum_catch1, fum_match1); |
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349 | } |
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350 | } |
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351 | |
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352 | void foe() { |
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353 | // resume block, call terminate |
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354 | { |
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355 | bool foe_handle1(exception except) { |
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356 | if (3 == except) { |
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357 | printf("foe caught exception 3\n"); |
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358 | return true; |
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359 | } else { |
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360 | return false; |
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361 | } |
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362 | } |
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363 | struct __try_resume_node node |
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364 | __attribute__((cleanup(__try_resume_node_delete))); |
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365 | __try_resume_node_new(&node, foe_handle1); |
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366 | { |
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367 | terminate(3); |
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368 | } |
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369 | } |
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370 | } |
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371 | |
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372 | void fy() { |
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373 | // terminate block calls fum, call foe |
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374 | { |
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375 | void fy_try1() { |
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376 | foe(); |
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377 | } |
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378 | void fy_catch1(int index, exception except) { |
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379 | switch (index) { |
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380 | case 1: |
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381 | printf("fy caught exception 3\n"); |
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382 | fum(); |
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383 | break; |
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384 | default: |
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385 | printf("INVALID INDEX in fy: %d (%d)\n", index, except); |
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386 | } |
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387 | } |
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388 | int fy_match1(exception except) { |
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389 | if (3 == except) { |
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390 | return 1; |
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391 | } else { |
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392 | return 0; |
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393 | } |
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394 | } |
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395 | __try_terminate(fy_try1, fy_catch1, fy_match1); |
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396 | } |
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397 | } |
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398 | |
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399 | void fee() { |
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400 | // resume block, call fy |
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401 | { |
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402 | bool fee_handle1(exception except) { |
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403 | if (3 == except) { |
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404 | printf("fee caught exception 3\n"); |
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405 | return true; |
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406 | } else { |
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407 | return false; |
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408 | } |
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409 | } |
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410 | struct __try_resume_node node |
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411 | __attribute__((cleanup(__try_resume_node_delete))); |
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412 | __try_resume_node_new(&node, fee_handle1); |
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413 | { |
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414 | fy(); |
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415 | } |
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416 | } |
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417 | } |
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418 | |
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419 | |
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420 | // main: choose which tests to run |
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421 | int main(int argc, char * argv[]) { |
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422 | raii_t a = {"main function"}; |
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423 | |
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424 | foo(); printf("\n"); |
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425 | alpha(); printf("\n"); |
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426 | farewell(); printf("\n"); |
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427 | fallback(); printf("\n"); |
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428 | terminate_swapped(); printf("\n"); |
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429 | resume_swapped(); printf("\n"); |
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430 | reresume(); printf("\n"); |
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431 | fee(); printf("\n"); |
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432 | // Uncaught termination test. |
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433 | terminate(7); |
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434 | } |
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