1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // dtor-early-exit.c -- |
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8 | // |
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9 | // Author : Rob Schluntz |
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10 | // Created On : Wed Aug 17 08:26:25 2016 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Wed Aug 17 08:29:37 2016 |
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13 | // Update Count : 2 |
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14 | // |
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15 | |
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16 | #include <fstream.hfa> |
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17 | #include <stdlib.hfa> |
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18 | extern "C" { |
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19 | #define false ((int)0) // until stdbool.h works |
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20 | #define assert(cond) if (! (cond)) { sout | "Assertion failed: (" | #cond | ") at " __FILE__ | ":" | __LINE__ | endl; abort(); } |
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21 | } |
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22 | |
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23 | struct A { |
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24 | const char * name; |
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25 | int * x; |
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26 | }; |
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27 | |
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28 | // don't want these called |
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29 | void ?{}(A & a) { assert( false ); } |
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30 | void ?{}(A & a, const char * name) { a.name = name; sout | "construct " | name | endl; a.x = (int*)malloc(); } |
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31 | void ?{}(A & a, const char * name, int * ptr) { assert( false ); } |
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32 | |
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33 | A ?=?(A & a, A b) { sout | "assign " | a.name | " " | b.name; return a; } |
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34 | void ?{}(A & a, A b) { sout | "copy construct " | b.name | endl; a.x = (int*)malloc(); } |
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35 | void ^?{}(A & a) { sout | "destruct " | a.name | endl; free(a.x); } |
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36 | |
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37 | // test returns |
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38 | void f(int i) { |
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39 | sout | "f i=" | i | endl; |
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40 | A x = { "x" }; // construct x |
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41 | { |
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42 | A y = { "y" }; // construct y |
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43 | { |
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44 | A z = { "z" }; // construct z |
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45 | { |
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46 | if (i == 0) return; // destruct x, y, z |
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47 | } |
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48 | if (i == 1) return; // destruct x, y, z |
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49 | // destruct z |
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50 | } |
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51 | if (i == 2) return; // destruct x, y |
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52 | // destruct y |
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53 | } |
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54 | return; // destruct x |
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55 | } |
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56 | |
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57 | // test loops, switch, etc. |
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58 | void g() { |
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59 | for (int i = 0; i < 10; i++) { |
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60 | sout | "g for i=" | i | endl; |
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61 | A x = { "x" }; |
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62 | // construct x |
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63 | // destruct x |
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64 | } |
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65 | sout | endl; |
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66 | { |
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67 | int i = 0; |
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68 | while (i < 10) { |
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69 | sout | "g while i=" | i | endl; |
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70 | A x = { "x" }; |
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71 | // construct x |
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72 | i++; |
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73 | // destruct x |
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74 | } |
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75 | } |
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76 | sout | endl; |
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77 | for (int i = 0; i < 10; i++) { |
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78 | switch(10) { |
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79 | case 0: |
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80 | case 5: |
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81 | case 10: { |
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82 | A y = { "y" }; |
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83 | sout | "g switch i=" | i | endl; |
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84 | // construct y |
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85 | break; // destruct y |
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86 | } |
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87 | default: { |
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88 | sout | "g switch i=" | i | endl; |
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89 | A x = { "x" }; |
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90 | // construct x |
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91 | break; // destruct x |
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92 | } |
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93 | } |
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94 | } |
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95 | sout | endl; |
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96 | for (int k = 0; k < 2; k++) { |
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97 | sout | "g for k=" | k | endl; |
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98 | L1: for (int i = 0; i < 10; i++) { |
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99 | sout | "g for i=" | i | endl; |
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100 | |
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101 | A x = { "x" }; |
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102 | if (i == 2) { |
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103 | sout | "continue L1" | endl; |
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104 | continue; // destruct x |
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105 | } else if (i == 3) { |
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106 | sout | "break L1" | endl; |
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107 | break; // destruct x |
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108 | } |
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109 | |
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110 | L2: for (int j = 0; j < 10; j++) { |
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111 | sout | "g for j=" | j | endl; |
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112 | A y = { "y" }; |
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113 | if (j == 0) { |
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114 | sout | "continue L2" | endl; |
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115 | continue; // destruct y - missing because object that needs to be destructed is not a part of this block, it's a part of the for's block |
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116 | } else if (j == 1) { |
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117 | sout | "break L2" | endl; |
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118 | break; // destruct y |
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119 | } else if (i == 1) { |
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120 | sout | "continue L1" | endl; |
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121 | continue L1; // destruct x,y - note: continue takes you to destructors for block, so only generate destructor for y |
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122 | } else if (k == 1) { |
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123 | sout | "break L1" | endl; |
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124 | break L1; // destruct x,y |
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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 | |
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130 | sout | endl; |
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131 | L3: if( 3 ) { |
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132 | A w = { "w" }; |
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133 | if( 4 ) { |
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134 | A v = { "v" }; |
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135 | sout | "break L3" | endl; |
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136 | break L3; |
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137 | } |
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138 | } |
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139 | } |
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140 | |
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141 | // test goto |
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142 | void h() { |
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143 | int i = 0; |
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144 | // for each goto G with target label L: |
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145 | // * find all constructed variables alive at G (set S_G) |
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146 | // * find all constructed variables alive at L (set S_L) |
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147 | // * if S_L-S_G is non-empty, error |
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148 | // * emit destructors for all variables in S_G-S_L |
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149 | sout | "h" | endl; |
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150 | { |
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151 | L0: ; |
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152 | #ifdef ERR1 |
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153 | goto L1; // this is an error in g++ because it skips initialization of y |
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154 | #endif |
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155 | A y = { "y" }; |
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156 | // S_L1 = { y } |
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157 | L1: sout | "L1" | endl; |
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158 | A x = { "x" }; |
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159 | // S_L2 = { y, x } |
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160 | L2: sout | "L2" | endl; |
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161 | if (i == 0) { |
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162 | ++i; |
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163 | sout | "goto L1" | endl; |
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164 | // S_G = { y, x } |
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165 | goto L1; // jump back, destruct b/c before x definition |
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166 | // S_L-S_G = {} => no error |
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167 | // S_G-S_L = { x } => destruct x |
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168 | } else if (i == 1) { |
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169 | ++i; |
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170 | sout | "goto L2" | endl; |
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171 | // S_G = { y, x } |
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172 | goto L2; // jump back, do not destruct |
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173 | // S_L-S_G = {} |
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174 | // S_G-S_L = {} => destruct nothing |
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175 | } else if (i == 2) { |
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176 | ++i; |
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177 | sout | "goto L3" | endl; |
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178 | // S_G = { y, x } |
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179 | goto L3; // jump ahead, do not destruct |
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180 | // S_L-S_G = {} |
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181 | // S_G-S_L = {} |
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182 | } else if (false) { |
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183 | ++i; |
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184 | A z = { "z" }; |
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185 | sout | "goto L3-2" | endl; |
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186 | // S_G = { z, y, x } |
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187 | goto L3; |
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188 | // S_L-S_G = {} |
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189 | // S_G-S_L = {z} => destruct z |
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190 | } else { |
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191 | ++i; |
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192 | sout | "goto L4" | endl; |
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193 | // S_G = { y, x } |
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194 | goto L4; // jump ahead, destruct b/c left block x was defined in |
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195 | // S_L-S_G = {} |
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196 | // S_G-S_L = { y, x } => destruct y, x |
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197 | } |
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198 | // S_L3 = { y, x } |
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199 | L3: sout | "L3" | endl; |
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200 | sout | "goto L2-2" | endl; |
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201 | // S_G = { y, x } |
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202 | goto L2; // jump back, do not destruct |
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203 | // S_L-S_G = {} |
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204 | // S_G-S_L = {} |
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205 | } |
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206 | // S_L4 = {} |
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207 | L4: sout | "L4" | endl; |
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208 | if (i == 4) { |
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209 | sout | "goto L0" | endl; |
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210 | // S_G = {} |
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211 | goto L0; |
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212 | // S_L-S_G = {} |
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213 | // S_G-S_L = {} |
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214 | } |
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215 | #ifdef ERR2 |
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216 | // S_G = {} |
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217 | if (i == 5) goto L2; // this is an error in g++ because it skips initialization of y, x |
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218 | // S_L-S_G = { y, x } => non-empty, so error |
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219 | #endif |
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220 | } |
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221 | |
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222 | // TODO: implement __label__ and uncomment these lines |
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223 | void computedGoto() { |
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224 | // __label__ bar; |
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225 | void *ptr; |
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226 | ptr = &&foo; |
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227 | goto *ptr; |
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228 | assert(false); |
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229 | foo: ; |
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230 | // void f() { |
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231 | // ptr = &&bar; |
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232 | // goto *ptr; |
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233 | // assert(false); |
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234 | // } |
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235 | // f(); |
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236 | // assert(false); |
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237 | // bar: ; |
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238 | } |
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239 | |
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240 | int main() { |
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241 | sepDisable(sout); |
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242 | for (int i = 0; i < 4; i++) { |
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243 | f(i); |
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244 | } |
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245 | sout | endl; |
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246 | g(); |
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247 | sout | endl; |
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248 | h(); |
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249 | |
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250 | computedGoto(); |
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251 | } |
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252 | |
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253 | // Local Variables: // |
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254 | // tab-width: 4 // |
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255 | // compile-command: "cfa dtor-early-exit" // |
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256 | // End: // |
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