1 | /*
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2 | ** error.c - Exception class
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3 | **
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4 | ** See Copyright Notice in mruby.h
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5 | */
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6 |
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7 | #include <errno.h>
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8 | #include <stdarg.h>
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9 | #include <stdlib.h>
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10 | #include <mruby.h>
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11 | #include <mruby/array.h>
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12 | #include <mruby/irep.h>
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13 | #include <mruby/proc.h>
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14 | #include <mruby/string.h>
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15 | #include <mruby/variable.h>
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16 | #include <mruby/debug.h>
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17 | #include <mruby/error.h>
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18 | #include <mruby/class.h>
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19 | #include <mruby/throw.h>
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20 |
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21 | MRB_API mrb_value
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22 | mrb_exc_new(mrb_state *mrb, struct RClass *c, const char *ptr, size_t len)
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23 | {
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24 | mrb_value arg = mrb_str_new(mrb, ptr, len);
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25 | return mrb_obj_new(mrb, c, 1, &arg);
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26 | }
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27 |
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28 | MRB_API mrb_value
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29 | mrb_exc_new_str(mrb_state *mrb, struct RClass* c, mrb_value str)
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30 | {
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31 | str = mrb_str_to_str(mrb, str);
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32 | return mrb_obj_new(mrb, c, 1, &str);
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33 | }
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34 |
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35 | /*
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36 | * call-seq:
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37 | * Exception.new(msg = nil) -> exception
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38 | *
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39 | * Construct a new Exception object, optionally passing in
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40 | * a message.
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41 | */
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42 |
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43 | static mrb_value
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44 | exc_initialize(mrb_state *mrb, mrb_value exc)
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45 | {
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46 | mrb_value mesg;
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47 | mrb_int argc;
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48 | mrb_value *argv;
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49 |
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50 | if (mrb_get_args(mrb, "|o*", &mesg, &argv, &argc) >= 1) {
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51 | mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "mesg"), mesg);
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52 | }
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53 | return exc;
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54 | }
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55 |
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56 | /*
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57 | * Document-method: exception
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58 | *
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59 | * call-seq:
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60 | * exc.exception(string) -> an_exception or exc
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61 | *
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62 | * With no argument, or if the argument is the same as the receiver,
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63 | * return the receiver. Otherwise, create a new
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64 | * exception object of the same class as the receiver, but with a
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65 | * message equal to <code>string</code>.
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66 | *
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67 | */
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68 |
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69 | static mrb_value
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70 | exc_exception(mrb_state *mrb, mrb_value self)
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71 | {
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72 | mrb_value exc;
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73 | mrb_value a;
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74 | int argc;
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75 |
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76 | argc = mrb_get_args(mrb, "|o", &a);
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77 | if (argc == 0) return self;
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78 | if (mrb_obj_equal(mrb, self, a)) return self;
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79 | exc = mrb_obj_clone(mrb, self);
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80 | mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "mesg"), a);
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81 |
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82 | return exc;
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83 | }
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84 |
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85 | /*
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86 | * call-seq:
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87 | * exception.to_s -> string
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88 | *
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89 | * Returns exception's message (or the name of the exception if
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90 | * no message is set).
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91 | */
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92 |
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93 | static mrb_value
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94 | exc_to_s(mrb_state *mrb, mrb_value exc)
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95 | {
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96 | mrb_value mesg = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "mesg"));
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97 | struct RObject *p;
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98 |
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99 | if (!mrb_string_p(mesg)) {
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100 | return mrb_str_new_cstr(mrb, mrb_obj_classname(mrb, exc));
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101 | }
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102 | p = mrb_obj_ptr(mesg);
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103 | if (!p->c) {
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104 | p->c = mrb->string_class;
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105 | }
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106 | return mesg;
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107 | }
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108 |
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109 | /*
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110 | * call-seq:
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111 | * exception.message -> string
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112 | *
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113 | * Returns the result of invoking <code>exception.to_s</code>.
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114 | * Normally this returns the exception's message or name.
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115 | */
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116 |
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117 | static mrb_value
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118 | exc_message(mrb_state *mrb, mrb_value exc)
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119 | {
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120 | return mrb_funcall(mrb, exc, "to_s", 0);
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121 | }
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122 |
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123 | /*
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124 | * call-seq:
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125 | * exception.inspect -> string
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126 | *
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127 | * Returns this exception's file name, line number,
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128 | * message and class name.
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129 | * If file name or line number is not set,
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130 | * returns message and class name.
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131 | */
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132 |
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133 | static mrb_value
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134 | exc_inspect(mrb_state *mrb, mrb_value exc)
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135 | {
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136 | mrb_value str, mesg, file, line;
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137 | mrb_bool append_mesg;
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138 | const char *cname;
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139 |
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140 | mesg = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "mesg"));
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141 | file = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "file"));
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142 | line = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "line"));
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143 |
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144 | append_mesg = !mrb_nil_p(mesg);
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145 | if (append_mesg) {
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146 | mesg = mrb_obj_as_string(mrb, mesg);
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147 | append_mesg = RSTRING_LEN(mesg) > 0;
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148 | }
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149 |
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150 | cname = mrb_obj_classname(mrb, exc);
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151 | str = mrb_str_new_cstr(mrb, cname);
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152 | if (mrb_string_p(file) && mrb_fixnum_p(line)) {
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153 | if (append_mesg) {
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154 | str = mrb_format(mrb, "%S:%S:%S (%S)", file, line, mesg, str);
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155 | }
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156 | else {
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157 | str = mrb_format(mrb, "%S:%S:%S", file, line, str);
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158 | }
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159 | }
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160 | else if (append_mesg) {
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161 | str = mrb_format(mrb, "%S:%S", str, mesg);
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162 | }
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163 | return str;
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164 | }
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165 |
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166 | void mrb_keep_backtrace(mrb_state *mrb, mrb_value exc);
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167 |
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168 | static void
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169 | set_backtrace(mrb_state *mrb, mrb_value exc, mrb_value backtrace)
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170 | {
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171 | if (!mrb_array_p(backtrace)) {
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172 | type_err:
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173 | mrb_raise(mrb, E_TYPE_ERROR, "backtrace must be Array of String");
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174 | }
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175 | else {
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176 | const mrb_value *p = RARRAY_PTR(backtrace);
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177 | const mrb_value *pend = p + RARRAY_LEN(backtrace);
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178 |
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179 | while (p < pend) {
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180 | if (!mrb_string_p(*p)) goto type_err;
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181 | p++;
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182 | }
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183 | }
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184 | mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "backtrace"), backtrace);
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185 | }
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186 |
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187 | static mrb_value
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188 | exc_set_backtrace(mrb_state *mrb, mrb_value exc)
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189 | {
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190 | mrb_value backtrace;
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191 |
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192 | mrb_get_args(mrb, "o", &backtrace);
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193 | set_backtrace(mrb, exc, backtrace);
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194 | return backtrace;
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195 | }
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196 |
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197 | static void
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198 | exc_debug_info(mrb_state *mrb, struct RObject *exc)
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199 | {
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200 | mrb_callinfo *ci = mrb->c->ci;
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201 | mrb_code *pc = ci->pc;
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202 |
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203 | while (ci >= mrb->c->cibase) {
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204 | mrb_code *err = ci->err;
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205 |
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206 | if (!err && pc) err = pc - 1;
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207 | if (err && ci->proc && !MRB_PROC_CFUNC_P(ci->proc)) {
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208 | mrb_irep *irep = ci->proc->body.irep;
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209 |
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210 | int32_t const line = mrb_debug_get_line(irep, (uint32_t)(err - irep->iseq));
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211 | char const* file = mrb_debug_get_filename(irep, (uint32_t)(err - irep->iseq));
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212 | if (line != -1 && file) {
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213 | mrb_obj_iv_set(mrb, exc, mrb_intern_lit(mrb, "file"), mrb_str_new_cstr(mrb, file));
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214 | mrb_obj_iv_set(mrb, exc, mrb_intern_lit(mrb, "line"), mrb_fixnum_value(line));
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215 | return;
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216 | }
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217 | }
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218 | pc = ci->pc;
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219 | ci--;
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220 | }
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221 | }
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222 |
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223 | void
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224 | mrb_exc_set(mrb_state *mrb, mrb_value exc)
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225 | {
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226 | if (mrb_nil_p(exc)) {
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227 | mrb->exc = 0;
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228 | }
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229 | else {
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230 | mrb->exc = mrb_obj_ptr(exc);
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231 | if (!mrb->gc.out_of_memory) {
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232 | exc_debug_info(mrb, mrb->exc);
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233 | mrb_keep_backtrace(mrb, exc);
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234 | }
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235 | }
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236 | }
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237 |
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238 | MRB_API mrb_noreturn void
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239 | mrb_exc_raise(mrb_state *mrb, mrb_value exc)
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240 | {
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241 | if (!mrb_obj_is_kind_of(mrb, exc, mrb->eException_class)) {
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242 | mrb_raise(mrb, E_TYPE_ERROR, "exception object expected");
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243 | }
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244 | mrb_exc_set(mrb, exc);
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245 | if (!mrb->jmp) {
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246 | mrb_p(mrb, exc);
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247 | abort();
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248 | }
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249 | MRB_THROW(mrb->jmp);
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250 | }
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251 |
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252 | MRB_API mrb_noreturn void
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253 | mrb_raise(mrb_state *mrb, struct RClass *c, const char *msg)
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254 | {
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255 | mrb_exc_raise(mrb, mrb_exc_new_str(mrb, c, mrb_str_new_cstr(mrb, msg)));
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256 | }
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257 |
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258 | MRB_API mrb_value
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259 | mrb_vformat(mrb_state *mrb, const char *format, va_list ap)
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260 | {
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261 | const char *p = format;
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262 | const char *b = p;
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263 | ptrdiff_t size;
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264 | mrb_value ary = mrb_ary_new_capa(mrb, 4);
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265 | int ai = mrb_gc_arena_save(mrb);
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266 |
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267 | while (*p) {
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268 | const char c = *p++;
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269 |
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270 | if (c == '%') {
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271 | if (*p == 'S') {
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272 | size = p - b - 1;
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273 | mrb_ary_push(mrb, ary, mrb_str_new(mrb, b, size));
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274 | mrb_ary_push(mrb, ary, va_arg(ap, mrb_value));
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275 | b = p + 1;
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276 | }
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277 | }
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278 | else if (c == '\\') {
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279 | if (*p) {
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280 | size = p - b - 1;
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281 | mrb_ary_push(mrb, ary, mrb_str_new(mrb, b, size));
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282 | mrb_ary_push(mrb, ary, mrb_str_new(mrb, p, 1));
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283 | b = ++p;
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284 | }
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285 | else {
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286 | break;
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287 | }
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288 | }
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289 | mrb_gc_arena_restore(mrb, ai);
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290 | }
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291 | if (b == format) {
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292 | return mrb_str_new_cstr(mrb, format);
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293 | }
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294 | else {
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295 | size = p - b;
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296 | if (size > 0) {
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297 | mrb_ary_push(mrb, ary, mrb_str_new(mrb, b, size));
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298 | mrb_gc_arena_restore(mrb, ai);
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299 | }
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300 | return mrb_ary_join(mrb, ary, mrb_nil_value());
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301 | }
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302 | }
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303 |
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304 | MRB_API mrb_value
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305 | mrb_format(mrb_state *mrb, const char *format, ...)
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306 | {
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307 | va_list ap;
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308 | mrb_value str;
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309 |
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310 | va_start(ap, format);
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311 | str = mrb_vformat(mrb, format, ap);
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312 | va_end(ap);
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313 |
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314 | return str;
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315 | }
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316 |
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317 | static mrb_noreturn void
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318 | raise_va(mrb_state *mrb, struct RClass *c, const char *fmt, va_list ap, int argc, mrb_value *argv)
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319 | {
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320 | mrb_value mesg;
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321 |
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322 | mesg = mrb_vformat(mrb, fmt, ap);
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323 | if (argv == NULL) {
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324 | argv = &mesg;
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325 | }
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326 | else {
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327 | argv[0] = mesg;
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328 | }
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329 | mrb_exc_raise(mrb, mrb_obj_new(mrb, c, argc+1, argv));
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330 | }
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331 |
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332 | MRB_API mrb_noreturn void
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333 | mrb_raisef(mrb_state *mrb, struct RClass *c, const char *fmt, ...)
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334 | {
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335 | va_list args;
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336 |
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337 | va_start(args, fmt);
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338 | raise_va(mrb, c, fmt, args, 0, NULL);
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339 | va_end(args);
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340 | }
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341 |
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342 | MRB_API mrb_noreturn void
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343 | mrb_name_error(mrb_state *mrb, mrb_sym id, const char *fmt, ...)
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344 | {
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345 | mrb_value argv[2];
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346 | va_list args;
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347 |
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348 | va_start(args, fmt);
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349 | argv[1] = mrb_symbol_value(id);
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350 | raise_va(mrb, E_NAME_ERROR, fmt, args, 1, argv);
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351 | va_end(args);
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352 | }
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353 |
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354 | MRB_API void
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355 | mrb_warn(mrb_state *mrb, const char *fmt, ...)
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356 | {
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357 | #ifndef MRB_DISABLE_STDIO
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358 | va_list ap;
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359 | mrb_value str;
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360 |
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361 | va_start(ap, fmt);
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362 | str = mrb_vformat(mrb, fmt, ap);
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363 | fputs("warning: ", stderr);
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364 | fwrite(RSTRING_PTR(str), RSTRING_LEN(str), 1, stderr);
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365 | va_end(ap);
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366 | #endif
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367 | }
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368 |
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369 | MRB_API mrb_noreturn void
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370 | mrb_bug(mrb_state *mrb, const char *fmt, ...)
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371 | {
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372 | #ifndef MRB_DISABLE_STDIO
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373 | va_list ap;
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374 | mrb_value str;
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375 |
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376 | va_start(ap, fmt);
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377 | str = mrb_vformat(mrb, fmt, ap);
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378 | fputs("bug: ", stderr);
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379 | fwrite(RSTRING_PTR(str), RSTRING_LEN(str), 1, stderr);
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380 | va_end(ap);
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381 | #endif
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382 | exit(EXIT_FAILURE);
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383 | }
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384 |
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385 | MRB_API mrb_value
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386 | mrb_make_exception(mrb_state *mrb, int argc, const mrb_value *argv)
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387 | {
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388 | mrb_value mesg;
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389 | int n;
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390 |
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391 | mesg = mrb_nil_value();
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392 | switch (argc) {
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393 | case 0:
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394 | break;
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395 | case 1:
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396 | if (mrb_nil_p(argv[0]))
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397 | break;
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398 | if (mrb_string_p(argv[0])) {
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399 | mesg = mrb_exc_new_str(mrb, E_RUNTIME_ERROR, argv[0]);
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400 | break;
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401 | }
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402 | n = 0;
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403 | goto exception_call;
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404 |
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405 | case 2:
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406 | case 3:
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407 | n = 1;
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408 | exception_call:
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409 | {
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410 | mrb_sym exc = mrb_intern_lit(mrb, "exception");
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411 | if (mrb_respond_to(mrb, argv[0], exc)) {
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412 | mesg = mrb_funcall_argv(mrb, argv[0], exc, n, argv+1);
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413 | }
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414 | else {
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415 | /* undef */
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416 | mrb_raise(mrb, E_TYPE_ERROR, "exception class/object expected");
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417 | }
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418 | }
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419 |
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420 | break;
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421 | default:
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422 | mrb_raisef(mrb, E_ARGUMENT_ERROR, "wrong number of arguments (%S for 0..3)", mrb_fixnum_value(argc));
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423 | break;
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424 | }
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425 | if (argc > 0) {
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426 | if (!mrb_obj_is_kind_of(mrb, mesg, mrb->eException_class))
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427 | mrb_raise(mrb, mrb->eException_class, "exception object expected");
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428 | if (argc > 2)
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429 | set_backtrace(mrb, mesg, argv[2]);
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430 | }
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431 |
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432 | return mesg;
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433 | }
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434 |
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435 | MRB_API void
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436 | mrb_sys_fail(mrb_state *mrb, const char *mesg)
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437 | {
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438 | struct RClass *sce;
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439 | mrb_int no;
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440 |
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441 | no = (mrb_int)errno;
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442 | if (mrb_class_defined(mrb, "SystemCallError")) {
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443 | sce = mrb_class_get(mrb, "SystemCallError");
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444 | if (mesg != NULL) {
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445 | mrb_funcall(mrb, mrb_obj_value(sce), "_sys_fail", 2, mrb_fixnum_value(no), mrb_str_new_cstr(mrb, mesg));
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446 | }
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447 | else {
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448 | mrb_funcall(mrb, mrb_obj_value(sce), "_sys_fail", 1, mrb_fixnum_value(no));
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449 | }
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450 | }
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451 | else {
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452 | mrb_raise(mrb, E_RUNTIME_ERROR, mesg);
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453 | }
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454 | }
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455 |
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456 | MRB_API mrb_noreturn void
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457 | mrb_no_method_error(mrb_state *mrb, mrb_sym id, mrb_value args, char const* fmt, ...)
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458 | {
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459 | mrb_value exc;
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460 | mrb_value argv[3];
|
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461 | va_list ap;
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462 |
|
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463 | va_start(ap, fmt);
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464 | argv[0] = mrb_vformat(mrb, fmt, ap);
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465 | argv[1] = mrb_symbol_value(id);
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466 | argv[2] = args;
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467 | va_end(ap);
|
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468 | exc = mrb_obj_new(mrb, E_NOMETHOD_ERROR, 3, argv);
|
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469 | mrb_exc_raise(mrb, exc);
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470 | }
|
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471 |
|
---|
472 | void
|
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473 | mrb_init_exception(mrb_state *mrb)
|
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474 | {
|
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475 | struct RClass *exception, *script_error, *stack_error, *nomem_error;
|
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476 |
|
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477 | mrb->eException_class = exception = mrb_define_class(mrb, "Exception", mrb->object_class); /* 15.2.22 */
|
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478 | MRB_SET_INSTANCE_TT(exception, MRB_TT_EXCEPTION);
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479 | mrb_define_class_method(mrb, exception, "exception", mrb_instance_new, MRB_ARGS_ANY());
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480 | mrb_define_method(mrb, exception, "exception", exc_exception, MRB_ARGS_ANY());
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481 | mrb_define_method(mrb, exception, "initialize", exc_initialize, MRB_ARGS_ANY());
|
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482 | mrb_define_method(mrb, exception, "to_s", exc_to_s, MRB_ARGS_NONE());
|
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483 | mrb_define_method(mrb, exception, "message", exc_message, MRB_ARGS_NONE());
|
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484 | mrb_define_method(mrb, exception, "inspect", exc_inspect, MRB_ARGS_NONE());
|
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485 | mrb_define_method(mrb, exception, "backtrace", mrb_exc_backtrace, MRB_ARGS_NONE());
|
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486 | mrb_define_method(mrb, exception, "set_backtrace", exc_set_backtrace, MRB_ARGS_REQ(1));
|
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487 |
|
---|
488 | mrb->eStandardError_class = mrb_define_class(mrb, "StandardError", mrb->eException_class); /* 15.2.23 */
|
---|
489 | mrb_define_class(mrb, "RuntimeError", mrb->eStandardError_class); /* 15.2.28 */
|
---|
490 | script_error = mrb_define_class(mrb, "ScriptError", mrb->eException_class); /* 15.2.37 */
|
---|
491 | mrb_define_class(mrb, "SyntaxError", script_error); /* 15.2.38 */
|
---|
492 | stack_error = mrb_define_class(mrb, "SystemStackError", exception);
|
---|
493 | mrb->stack_err = mrb_obj_ptr(mrb_exc_new_str_lit(mrb, stack_error, "stack level too deep"));
|
---|
494 |
|
---|
495 | nomem_error = mrb_define_class(mrb, "NoMemoryError", exception);
|
---|
496 | mrb->nomem_err = mrb_obj_ptr(mrb_exc_new_str_lit(mrb, nomem_error, "Out of memory"));
|
---|
497 | #ifdef MRB_GC_FIXED_ARENA
|
---|
498 | mrb->arena_err = mrb_obj_ptr(mrb_exc_new_str_lit(mrb, nomem_error, "arena overflow error"));
|
---|
499 | #endif
|
---|
500 | }
|
---|