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 | // Helps with manual translation. It may or may not get folded into the
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9 | // header, that depends on how it interacts with concurancy.
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10 | void __try_resume_node_new(struct __try_resume_node * node,
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11 | _Bool (*handler)(exception except)) {
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12 | node->next = shared_stack.top_resume;
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13 | shared_stack.top_resume = node;
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14 | node->try_to_handle = handler;
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15 | }
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16 |
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17 | // Local Print On Exit:
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18 | struct raii_base_type {
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19 | const char * area;
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20 | };
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21 |
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22 | void raii_dtor(struct raii_base_type * this) {
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23 | printf("Exiting: %s\n", this->area);
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24 | }
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25 |
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26 | #define raii_t __attribute__((cleanup(raii_dtor))) struct raii_base_type
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27 |
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28 | // ===========================================================================
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29 | // Runtime code (post-translation).
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30 | void terminate(int except_value) {
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31 | raii_t a = {"terminate function"};
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32 | __throw_terminate(except_value);
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33 | printf("terminate returned\n");
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34 | }
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35 |
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36 | void resume(int except_value) {
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37 | raii_t a = {"resume function"};
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38 | __throw_resume(except_value);
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39 | printf("resume returned\n");
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40 | }
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41 |
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42 | // Termination Test: Two handlers: no catch, catch
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43 | void bar() {
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44 | raii_t a = {"bar function"};
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45 | {
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46 | void bar_try1() {
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47 | terminate(4);
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48 | }
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49 | void bar_catch1(int index, exception except) {
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50 | switch(except) {
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51 | case 1:
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52 | printf("bar caught exception 3.\n");
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53 | break;
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54 | default:
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55 | printf("INVALID INDEX in bar: %d (%d)\n", index, except);
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56 | }
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57 | }
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58 | int bar_match1(exception except) {
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59 | if (3 == except) {
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60 | return 1;
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61 | } else {
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62 | return 0;
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63 | }
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64 | }
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65 | __try_terminate(bar_try1, bar_catch1, bar_match1);
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66 | }
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67 | }
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68 |
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69 | void foo() {
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70 | raii_t a = {"foo function"};
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71 | {
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72 | void foo_try1() {
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73 | bar();
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74 | }
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75 | void foo_catch1(int index, exception except) {
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76 | switch(index) {
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77 | case 1:
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78 | printf("foo caught exception 4.\n");
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79 | break;
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80 | case 2:
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81 | printf("foo caught exception 2.\n");
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82 | break;
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83 | default:
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84 | printf("INVALID INDEX in foo: %d (%d)\n", index, except);
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85 | }
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86 | }
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87 | int foo_match1(exception except) {
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88 | if (4 == except) {
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89 | return 1;
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90 | } else if (2 == except) {
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91 | return 2;
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92 | } else {
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93 | return 0;
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94 | }
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95 | }
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96 | __try_terminate(foo_try1, foo_catch1, foo_match1);
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97 | }
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98 | }
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99 |
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100 | // Resumption Two Handler Test: no catch, catch.
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101 | void beta() {
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102 | raii_t a = {"beta function"};
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103 | {
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104 | bool beta_handle1(exception except) {
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105 | if (3 == except) {
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106 | printf("beta caught exception 3\n");
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107 | return true;
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108 | } else {
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109 | return false;
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110 | }
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111 | }
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112 | struct __try_resume_node node
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113 | __attribute__((cleanup(__try_resume_cleanup)));
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114 | __try_resume_node_new(&node, beta_handle1);
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115 | {
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116 | resume(4);
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117 | }
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118 | }
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119 | }
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120 | void alpha() {
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121 | raii_t a = {"alpha function"};
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122 | {
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123 | bool alpha_handle1(exception except) {
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124 | if (2 == except) {
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125 | printf("alpha caught exception 2\n");
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126 | return true;
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127 | } else if (4 == except) {
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128 | printf("alpha caught exception 4\n");
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129 | return true;
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130 | } else {
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131 | return false;
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132 | }
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133 | }
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134 | struct __try_resume_node node
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135 | __attribute__((cleanup(__try_resume_cleanup)));
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136 | __try_resume_node_new(&node, alpha_handle1);
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137 | {
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138 | beta();
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139 | }
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140 | }
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141 | }
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142 |
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143 | // Finally Test:
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144 | void farewell(bool jump) {
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145 | {
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146 | void farewell_finally1() {
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147 | printf("See you next time\n");
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148 | }
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149 | struct __cleanup_hook __hidden_hook
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150 | __attribute__((cleanup(farewell_finally1)));
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151 | {
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152 | if (jump) {
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153 | printf("jump out of farewell\n");
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154 | goto endoffunction;
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155 | } else {
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156 | printf("walk out of farewell\n");
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157 | }
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158 | }
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159 | }
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160 | endoffunction:
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161 | printf("leaving farewell\n");
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162 | }
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163 |
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164 | // Resume-to-Terminate Test:
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165 | void fallback() {
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166 | {
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167 | void fallback_try1() {
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168 | resume(1);
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169 | }
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170 | void fallback_catch1(int index, exception except) {
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171 | switch (index) {
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172 | case 1:
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173 | printf("fallback caught termination 1\n");
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174 | break;
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175 | default:
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176 | printf("INVALID INDEX in fallback: %d (%d)\n", index, except);
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177 | }
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178 | }
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179 | int fallback_match1(exception except) {
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180 | if (1 == except) {
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181 | return 1;
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182 | } else {
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183 | return 0;
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184 | }
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185 | }
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186 | __try_terminate(fallback_try1, fallback_catch1, fallback_match1);
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187 | }
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188 | }
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189 |
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190 | // Terminate Throw New Exception:
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191 | void terminate_swap() {
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192 | raii_t a = {"terminate_swap"};
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193 | {
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194 | void fn_try1() {
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195 | terminate(2);
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196 | }
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197 | void fn_catch1(int index, exception except) {
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198 | switch (index) {
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199 | case 1:
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200 | terminate(1);
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201 | break;
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202 | default:
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203 | printf("INVALID INDEX in terminate_swap: %d (%d)\n",
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204 | index, except);
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205 | }
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206 | }
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207 | int fn_match1(exception except) {
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208 | if (2 == except) {
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209 | return 1;
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210 | } else {
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211 | return 0;
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212 | }
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213 | }
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214 | __try_terminate(fn_try1, fn_catch1, fn_match1);
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215 | }
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216 | }
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217 |
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218 | void terminate_swapped() {
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219 | raii_t a = {"terminate_swapped"};
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220 | {
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221 | void fn_try1() {
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222 | terminate_swap();
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223 | }
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224 | void fn_catch1(int index, exception except) {
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225 | switch (index) {
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226 | case 1:
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227 | printf("terminate_swapped caught exception 1\n");
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228 | break;
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229 | default:
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230 | printf("INVALID INDEX in terminate_swapped: %d (%d)\n",
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231 | index, except);
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232 | }
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233 | }
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234 | int fn_match1(exception except) {
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235 | if (1 == except) {
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236 | return 1;
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237 | } else {
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238 | return 0;
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239 | }
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240 | }
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241 | __try_terminate(fn_try1, fn_catch1, fn_match1);
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242 | }
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243 | }
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244 |
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245 | // Resume Throw New Exception:
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246 | void resume_swap() {
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247 | raii_t a = {"terminate_swap"};
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248 | {
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249 | bool fn_handle1(exception except) {
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250 | if (2 == except) {
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251 | resume(1);
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252 | return true;
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253 | } else {
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254 | return false;
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255 | }
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256 | }
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257 | struct __try_resume_node node
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258 | __attribute__((cleanup(__try_resume_cleanup)));
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259 | __try_resume_node_new(&node, fn_handle1);
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260 | {
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261 | resume(2);
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262 | }
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263 | }
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264 | }
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265 |
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266 | void resume_swapped() {
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267 | {
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268 | bool fn_handle1(exception except) {
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269 | if (1 == except) {
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270 | printf("resume_swapped caught exception 1\n");
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271 | return true;
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272 | } else {
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273 | return false;
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274 | }
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275 | }
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276 | struct __try_resume_node node
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277 | __attribute__((cleanup(__try_resume_cleanup)));
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278 | __try_resume_node_new(&node, fn_handle1);
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279 | {
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280 | resume_swap();
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281 | }
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282 | }
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283 | }
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284 |
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285 | // Terminate Rethrow:
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286 | // I don't have an implementation for this.
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287 | void reterminate() {
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288 | {
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289 | void fn_try1() {
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290 | void fn_try2() {
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291 | terminate(1);
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292 | }
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293 | void fn_catch2(int index, exception except) {
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294 | switch (index) {
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295 | case 1:
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296 | printf("reterminate 2 caught and "
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297 | "will rethrow exception 1\n");
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298 | __rethrow_terminate();
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299 | break;
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300 | default:
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301 | printf("INVALID INDEX in reterminate 2: %d (%d)\n",
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302 | index, except);
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303 | }
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304 | }
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305 | int fn_match2(exception except) {
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306 | if (1 == except) {
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307 | return 1;
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308 | } else {
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309 | return 0;
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310 | }
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311 | }
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312 | __try_terminate(fn_try2, fn_catch2, fn_match2);
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313 | }
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314 | void fn_catch1(int index, exception except) {
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315 | switch (index) {
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316 | case 1:
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317 | printf("reterminate 1 caught exception 1\n");
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318 | break;
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319 | default:
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320 | printf("INVALID INDEX in reterminate 1: %d (%d)\n",
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321 | index, except);
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322 | }
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323 | }
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324 | int fn_match1(exception except) {
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325 | if (1 == except) {
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326 | return 1;
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327 | } else {
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328 | return 0;
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329 | }
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330 | }
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331 | __try_terminate(fn_try1, fn_catch1, fn_match1);
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332 | }
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333 | }
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334 |
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335 | // Resume Rethrow:
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336 | void reresume() {
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337 | {
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338 | bool reresume_handle1(exception except) {
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339 | if (1 == except) {
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340 | printf("reresume 1 caught exception 1\n");
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341 | return true;
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342 | } else {
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343 | return false;
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344 | }
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345 | }
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346 | struct __try_resume_node node
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347 | __attribute__((cleanup(__try_resume_cleanup)));
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348 | __try_resume_node_new(&node, reresume_handle1);
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349 | {
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350 | bool reresume_handle2(exception except) {
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351 | if (1 == except) {
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352 | printf("reresume 2 caught and rethrows exception 1\n");
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353 | return false;
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354 | } else {
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355 | return false;
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356 | }
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357 | }
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358 | struct __try_resume_node node
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359 | __attribute__((cleanup(__try_resume_cleanup)));
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360 | __try_resume_node_new(&node, reresume_handle2);
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361 | {
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362 | resume(1);
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363 | }
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364 | }
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365 | }
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366 | }
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367 |
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368 | // Terminate-Resume interaction:
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369 | void fum() {
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370 | // terminate block, call resume
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371 | {
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372 | void fum_try1() {
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373 | resume(3);
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374 | }
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375 | void fum_catch1(int index, exception except) {
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376 | switch (index) {
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377 | case 1:
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378 | printf("fum caught exception 3\n");
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379 | break;
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380 | default:
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381 | printf("INVALID INDEX in fum: %d (%d)\n", index, except);
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382 | }
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383 | }
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384 | int fum_match1(exception except) {
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385 | if (3 == except) {
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386 | return 1;
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387 | } else {
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388 | return 0;
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389 | }
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390 | }
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391 | __try_terminate(fum_try1, fum_catch1, fum_match1);
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392 | }
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393 | }
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394 |
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395 | void foe() {
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396 | // resume block, call terminate
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397 | {
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398 | bool foe_handle1(exception except) {
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399 | if (3 == except) {
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400 | printf("foe caught exception 3\n");
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401 | return true;
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402 | } else {
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403 | return false;
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404 | }
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405 | }
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406 | struct __try_resume_node node
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407 | __attribute__((cleanup(__try_resume_cleanup)));
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408 | __try_resume_node_new(&node, foe_handle1);
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409 | {
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410 | terminate(3);
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411 | }
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412 | }
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413 | }
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414 |
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415 | void fy() {
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416 | // terminate block calls fum, call foe
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417 | {
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418 | void fy_try1() {
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419 | foe();
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420 | }
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421 | void fy_catch1(int index, exception except) {
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422 | switch (index) {
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423 | case 1:
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424 | printf("fy caught exception 3\n");
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425 | fum();
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426 | break;
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427 | default:
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428 | printf("INVALID INDEX in fy: %d (%d)\n", index, except);
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429 | }
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430 | }
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431 | int fy_match1(exception except) {
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432 | if (3 == except) {
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433 | return 1;
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434 | } else {
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435 | return 0;
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436 | }
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437 | }
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438 | __try_terminate(fy_try1, fy_catch1, fy_match1);
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439 | }
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440 | }
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441 |
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442 | void fee() {
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443 | // resume block, call fy
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444 | {
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445 | bool fee_handle1(exception except) {
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446 | if (3 == except) {
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447 | printf("fee caught exception 3\n");
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448 | return true;
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449 | } else {
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450 | return false;
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451 | }
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452 | }
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453 | struct __try_resume_node node
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454 | __attribute__((cleanup(__try_resume_cleanup)));
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455 | __try_resume_node_new(&node, fee_handle1);
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456 | {
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457 | fy();
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458 | }
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459 | }
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460 | }
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461 |
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462 |
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463 | // main: choose which tests to run
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464 | int main(int argc, char * argv[]) {
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465 | raii_t a = {"main function"};
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466 |
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467 | foo(); printf("\n");
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468 | alpha(); printf("\n");
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469 | farewell(false); printf("\n");
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470 | farewell(true); printf("\n");
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471 | fallback(); printf("\n");
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472 | terminate_swapped(); printf("\n");
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473 | resume_swapped(); printf("\n");
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474 | reterminate(); printf("\n");
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475 | reresume(); printf("\n");
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476 | fee(); printf("\n");
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477 | // Uncaught termination test.
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478 | terminate(7);
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479 | }
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