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annotate test/callback_plain_c++/test_main.cc @ 555:214c4efc104f

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- test/callback_plain_c++: added check and a slightly different test for C++ copy-elision/retval-optimization, as C++ finds ambiguities totally ok
author Tassilo Philipp
date Mon, 20 Jun 2022 17:42:13 +0200
parents ca28e9e3c644
children b36a738c8975
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1 /*
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2
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3 Package: dyncall
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4 Library: test
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5 File: test/callback_plain_c++/test_main.c
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6 Description:
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7
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8 Tests only C++ specifics:
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9 - method callback handlers (= standard dyncallback handler, but testing
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10 calling convention mode setting and hidden this ptr)
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11 - calling functions or methods that take/return non-trivial C++ aggregates
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12
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13 License:
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14
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15 Copyright (c) 2022 Tassilo Philipp <tphilipp@potion-studios.com>
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16
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17 Permission to use, copy, modify, and distribute this software for any
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18 purpose with or without fee is hereby granted, provided that the above
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19 copyright notice and this permission notice appear in all copies.
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20
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21 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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22 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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24 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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25 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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26 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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27 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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28
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29 */
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30
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31 #include "../../dyncallback/dyncall_callback.h"
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32 #include "../common/platformInit.h"
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33 #include "../common/platformInit.c" /* Impl. for functions only used in this translation unit */
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35
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36 #if defined(DC__Feature_AggrByVal)
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37 struct Triv {
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38 float t;
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39 };
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40
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41 struct NonTriv {
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42 int i, j;
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43 static int a, b;
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44 NonTriv(int a, int b) : i(a),j(b) { printf("%s\n", "NonTriv::NonTriv(int,int) called"); }
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45 NonTriv(const NonTriv& rhs) { printf("%s\n", "NonTriv::NonTriv(const NonTriv&) called"); i = a++; j = b++; }
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46 };
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47 int NonTriv::a = 13;
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48 int NonTriv::b = 37;
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49
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52 char cbNonTrivAggrArgHandler(DCCallback* cb, DCArgs* args, DCValue* result, void* userdata)
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53 {
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54 int* ud = (int*)userdata;
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55 int arg1;
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56 NonTriv arg2(0, 0);
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57 NonTriv arg3(0, 0);
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58 Triv arg4;
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59 double arg5;
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60
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61 printf("reached callback\n");
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62 printf("userdata: %d\n", *ud);
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63
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64 // the non-triv arg4 test basically assures that the aggr description list is
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65 // respected (with first two being NULL as non-trivial aggrs)
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66 arg1 = dcbArgInt(args); printf("1st argument: %d\n", arg1);
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67 arg2 = *(NonTriv*)dcbArgAggr(args, NULL); printf("2nd argument: %d %d\n", arg2.i, arg2.j);
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68 arg3 = *(NonTriv*)dcbArgAggr(args, NULL); printf("3nd argument: %d %d\n", arg3.i, arg3.j);
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69 dcbArgAggr(args, (DCpointer)&arg4); printf("4th argument: %f\n", arg4.t);
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70 arg5 = dcbArgDouble(args); printf("5th argument: %f\n", arg5);
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71
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72 // the non-triv aggregate members are 14, 38 and 15, 39, respectively, b/c of
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73 // copy-ctor call on *passing* them to this handler (not b/c of assignment
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74 // operator, above); see above where 13 and 37 are initialized
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75 result->d = *ud + arg1 + arg2.i + arg2.j + arg3.i + arg3.j + arg4.t + arg5;
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76 return 'd';
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77 }
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78
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79
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80 int testNonTrivAggrArgsCallback()
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81 {
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82 DCCallback* cb;
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83 Triv t = { 1.75f };
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84 NonTriv a(1, 2);
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85 NonTriv b(a);
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86
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87 int ret = 1;
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88 double result = 0;
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89 int userdata = 1337;
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90
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91 DCaggr *triv_aggr = dcNewAggr(1, sizeof(t));
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92 dcAggrField(triv_aggr, DC_SIGCHAR_FLOAT, offsetof(Triv, t), 1);
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93 dcCloseAggr(triv_aggr);
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94
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95 DCaggr *aggrs[3] = { NULL, NULL, triv_aggr }; // NULL b/c non-trivial aggrs, see manpage
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96
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97 cb = dcbNewCallback2("iAAAd)d", &cbNonTrivAggrArgHandler, &userdata, aggrs);
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98
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99 result = ((double(*)(int, NonTriv, NonTriv, Triv, double))cb)(123, a, b, t, 4.5);
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100 dcbFreeCallback(cb);
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101
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102 printf("successfully returned from callback\n");
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103 printf("retval (should be 1572.25): %f\n", result);
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104
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105 ret = result == 1572.25 && ret;
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106
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107 return ret;
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108 }
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109
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110
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111
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112 char cbNonTrivAggrReturnHandler(DCCallback* cb, DCArgs* args, DCValue* result, void* userdata)
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113 {
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114 printf("reached callback\n");
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115 dcbReturnAggr(args, result, NULL); // this sets result->p to the non-triv aggr space allocated by the calling convention
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116 *(NonTriv*)result->p = NonTriv(1, 3); // explicit non-copy ctor and assignment operator, so not using NonTriv's statics a and b
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117
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118 return 'A';
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119 }
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120
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121
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122 int testNonTrivAggrReturnCallback()
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123 {
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124 int ret = 1;
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125
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126 {
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127 DCCallback* cb;
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128 DCaggr *aggrs[1] = { NULL }; // one non-triv aggr
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129 cb = dcbNewCallback2(")A", &cbNonTrivAggrReturnHandler, NULL, aggrs);
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130
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131 NonTriv result = ((NonTriv(*)())cb)(); // potential copy elision on construction
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132
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133 int a = NonTriv::a-1;
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134 int b = NonTriv::b-1;
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135 printf("successfully returned from callback 1/2\n");
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136 printf("retval w/ potential retval optimization and copy-init (should be %d %d for init or %d %d for copy, both allowed by C++): %d %d\n", 1, 3, a, b, result.i, result.j);
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137
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138 ret = ((result.i == 1 && result.j == 3) || (result.i == a && result.j == b)) && ret;
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139
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140 // avoid copy elision on construction
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141 result.i = result.j = -77;
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142 result = ((NonTriv(*)())cb)(); // potential copy elision
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143
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144 a = NonTriv::a-1;
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145 b = NonTriv::b-1;
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146 printf("successfully returned from callback 2/2\n");
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147 printf("retval w/ potential retval optimization and copy-init (should be %d %d for init or %d %d for copy, both allowed by C++): %d %d\n", 1, 3, a, b, result.i, result.j);
545
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148
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149 dcbFreeCallback(cb);
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150
555
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151 ret = ((result.i == 1 && result.j == 3) || (result.i == a && result.j == b)) && ret;
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152 }
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153
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154 return ret;
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155 }
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156 #endif
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157
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158
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159 int main()
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160 {
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161 int result = 1;
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162
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163 dcTest_initPlatform();
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164
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165 #if defined(DC__Feature_AggrByVal)
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166 result = testNonTrivAggrArgsCallback() && result;
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167 result = testNonTrivAggrReturnCallback() && result;
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168 #endif
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169
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170 printf("result: callback_plain_c++: %d\n", result);
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171
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172 dcTest_deInitPlatform();
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173
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174 return !result;
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175 }
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176