1 | /*
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2 | ** proc.c - Proc 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 <mruby.h>
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8 | #include <mruby/class.h>
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9 | #include <mruby/proc.h>
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10 | #include <mruby/opcode.h>
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11 |
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12 | static mrb_code call_iseq[] = {
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13 | MKOP_A(OP_CALL, 0),
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14 | };
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15 |
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16 | struct RProc *
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17 | mrb_proc_new(mrb_state *mrb, mrb_irep *irep)
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18 | {
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19 | struct RProc *p;
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20 | mrb_callinfo *ci = mrb->c->ci;
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21 |
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22 | p = (struct RProc*)mrb_obj_alloc(mrb, MRB_TT_PROC, mrb->proc_class);
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23 | p->target_class = 0;
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24 | if (ci) {
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25 | if (ci->proc)
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26 | p->target_class = ci->proc->target_class;
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27 | if (!p->target_class)
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28 | p->target_class = ci->target_class;
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29 | }
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30 | p->body.irep = irep;
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31 | p->env = 0;
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32 | mrb_irep_incref(mrb, irep);
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33 |
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34 | return p;
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35 | }
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36 |
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37 | static struct REnv*
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38 | env_new(mrb_state *mrb, int nlocals)
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39 | {
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40 | struct REnv *e;
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41 |
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42 | e = (struct REnv*)mrb_obj_alloc(mrb, MRB_TT_ENV, (struct RClass*)mrb->c->ci->proc->env);
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43 | MRB_SET_ENV_STACK_LEN(e, nlocals);
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44 | e->cxt.c = mrb->c;
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45 | e->cioff = mrb->c->ci - mrb->c->cibase;
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46 | e->stack = mrb->c->stack;
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47 |
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48 | return e;
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49 | }
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50 |
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51 | static void
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52 | closure_setup(mrb_state *mrb, struct RProc *p, int nlocals)
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53 | {
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54 | struct REnv *e;
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55 |
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56 | if (!mrb->c->ci->env) {
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57 | e = env_new(mrb, nlocals);
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58 | mrb->c->ci->env = e;
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59 | }
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60 | else {
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61 | e = mrb->c->ci->env;
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62 | }
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63 | p->env = e;
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64 | mrb_field_write_barrier(mrb, (struct RBasic *)p, (struct RBasic *)p->env);
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65 | }
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66 |
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67 | struct RProc *
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68 | mrb_closure_new(mrb_state *mrb, mrb_irep *irep)
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69 | {
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70 | struct RProc *p = mrb_proc_new(mrb, irep);
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71 |
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72 | closure_setup(mrb, p, mrb->c->ci->proc->body.irep->nlocals);
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73 | return p;
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74 | }
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75 |
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76 | MRB_API struct RProc *
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77 | mrb_proc_new_cfunc(mrb_state *mrb, mrb_func_t func)
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78 | {
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79 | struct RProc *p;
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80 |
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81 | p = (struct RProc*)mrb_obj_alloc(mrb, MRB_TT_PROC, mrb->proc_class);
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82 | p->body.func = func;
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83 | p->flags |= MRB_PROC_CFUNC;
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84 | p->env = 0;
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85 |
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86 | return p;
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87 | }
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88 |
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89 | MRB_API struct RProc *
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90 | mrb_proc_new_cfunc_with_env(mrb_state *mrb, mrb_func_t func, mrb_int argc, const mrb_value *argv)
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91 | {
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92 | struct RProc *p = mrb_proc_new_cfunc(mrb, func);
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93 | struct REnv *e;
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94 | int i;
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95 |
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96 | p->env = e = env_new(mrb, argc);
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97 | mrb_field_write_barrier(mrb, (struct RBasic *)p, (struct RBasic *)p->env);
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98 | MRB_ENV_UNSHARE_STACK(e);
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99 | e->stack = (mrb_value*)mrb_malloc(mrb, sizeof(mrb_value) * argc);
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100 | if (argv) {
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101 | for (i = 0; i < argc; ++i) {
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102 | e->stack[i] = argv[i];
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103 | }
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104 | }
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105 | else {
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106 | for (i = 0; i < argc; ++i) {
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107 | SET_NIL_VALUE(e->stack[i]);
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108 | }
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109 | }
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110 | return p;
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111 | }
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112 |
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113 | MRB_API struct RProc *
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114 | mrb_closure_new_cfunc(mrb_state *mrb, mrb_func_t func, int nlocals)
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115 | {
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116 | return mrb_proc_new_cfunc_with_env(mrb, func, nlocals, NULL);
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117 | }
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118 |
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119 | MRB_API mrb_value
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120 | mrb_proc_cfunc_env_get(mrb_state *mrb, mrb_int idx)
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121 | {
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122 | struct RProc *p = mrb->c->ci->proc;
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123 | struct REnv *e = p->env;
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124 |
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125 | if (!MRB_PROC_CFUNC_P(p)) {
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126 | mrb_raise(mrb, E_TYPE_ERROR, "Can't get cfunc env from non-cfunc proc.");
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127 | }
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128 | if (!e) {
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129 | mrb_raise(mrb, E_TYPE_ERROR, "Can't get cfunc env from cfunc Proc without REnv.");
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130 | }
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131 | if (idx < 0 || MRB_ENV_STACK_LEN(e) <= idx) {
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132 | mrb_raisef(mrb, E_INDEX_ERROR, "Env index out of range: %S (expected: 0 <= index < %S)",
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133 | mrb_fixnum_value(idx), mrb_fixnum_value(MRB_ENV_STACK_LEN(e)));
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134 | }
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135 |
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136 | return e->stack[idx];
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137 | }
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138 |
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139 | void
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140 | mrb_proc_copy(struct RProc *a, struct RProc *b)
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141 | {
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142 | a->flags = b->flags;
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143 | a->body = b->body;
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144 | if (!MRB_PROC_CFUNC_P(a) && a->body.irep) {
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145 | a->body.irep->refcnt++;
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146 | }
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147 | a->target_class = b->target_class;
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148 | a->env = b->env;
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149 | }
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150 |
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151 | static mrb_value
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152 | mrb_proc_s_new(mrb_state *mrb, mrb_value proc_class)
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153 | {
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154 | mrb_value blk;
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155 | mrb_value proc;
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156 | struct RProc *p;
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157 |
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158 | mrb_get_args(mrb, "&", &blk);
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159 | if (mrb_nil_p(blk)) {
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160 | /* Calling Proc.new without a block is not implemented yet */
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161 | mrb_raise(mrb, E_ARGUMENT_ERROR, "tried to create Proc object without a block");
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162 | }
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163 | p = (struct RProc *)mrb_obj_alloc(mrb, MRB_TT_PROC, mrb_class_ptr(proc_class));
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164 | mrb_proc_copy(p, mrb_proc_ptr(blk));
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165 | proc = mrb_obj_value(p);
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166 | mrb_funcall_with_block(mrb, proc, mrb_intern_lit(mrb, "initialize"), 0, NULL, blk);
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167 | return proc;
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168 | }
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169 |
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170 | static mrb_value
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171 | mrb_proc_init_copy(mrb_state *mrb, mrb_value self)
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172 | {
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173 | mrb_value proc;
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174 |
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175 | mrb_get_args(mrb, "o", &proc);
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176 | if (mrb_type(proc) != MRB_TT_PROC) {
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177 | mrb_raise(mrb, E_ARGUMENT_ERROR, "not a proc");
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178 | }
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179 | mrb_proc_copy(mrb_proc_ptr(self), mrb_proc_ptr(proc));
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180 | return self;
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181 | }
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182 |
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183 | int
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184 | mrb_proc_cfunc_p(struct RProc *p)
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185 | {
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186 | return MRB_PROC_CFUNC_P(p);
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187 | }
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188 |
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189 | mrb_value
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190 | mrb_proc_call_cfunc(mrb_state *mrb, struct RProc *p, mrb_value self)
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191 | {
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192 | return (p->body.func)(mrb, self);
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193 | }
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194 |
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195 | /* 15.2.17.4.2 */
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196 | static mrb_value
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197 | mrb_proc_arity(mrb_state *mrb, mrb_value self)
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198 | {
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199 | struct RProc *p = mrb_proc_ptr(self);
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200 | struct mrb_irep *irep;
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201 | mrb_code *iseq;
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202 | mrb_aspec aspec;
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203 | int ma, op, ra, pa, arity;
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204 |
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205 | if (MRB_PROC_CFUNC_P(p)) {
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206 | /* TODO cfunc aspec not implemented yet */
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207 | return mrb_fixnum_value(-1);
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208 | }
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209 |
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210 | irep = p->body.irep;
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211 | if (!irep) {
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212 | return mrb_fixnum_value(0);
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213 | }
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214 |
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215 | iseq = irep->iseq;
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216 | /* arity is depend on OP_ENTER */
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217 | if (GET_OPCODE(*iseq) != OP_ENTER) {
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218 | return mrb_fixnum_value(0);
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219 | }
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220 |
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221 | aspec = GETARG_Ax(*iseq);
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222 | ma = MRB_ASPEC_REQ(aspec);
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223 | op = MRB_ASPEC_OPT(aspec);
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224 | ra = MRB_ASPEC_REST(aspec);
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225 | pa = MRB_ASPEC_POST(aspec);
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226 | arity = ra || (MRB_PROC_STRICT_P(p) && op) ? -(ma + pa + 1) : ma + pa;
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227 |
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228 | return mrb_fixnum_value(arity);
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229 | }
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230 |
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231 | /* 15.3.1.2.6 */
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232 | /* 15.3.1.3.27 */
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233 | /*
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234 | * call-seq:
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235 | * lambda { |...| block } -> a_proc
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236 | *
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237 | * Equivalent to <code>Proc.new</code>, except the resulting Proc objects
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238 | * check the number of parameters passed when called.
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239 | */
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240 | static mrb_value
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241 | proc_lambda(mrb_state *mrb, mrb_value self)
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242 | {
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243 | mrb_value blk;
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244 | struct RProc *p;
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245 |
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246 | mrb_get_args(mrb, "&", &blk);
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247 | if (mrb_nil_p(blk)) {
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248 | mrb_raise(mrb, E_ARGUMENT_ERROR, "tried to create Proc object without a block");
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249 | }
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250 | if (mrb_type(blk) != MRB_TT_PROC) {
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251 | mrb_raise(mrb, E_ARGUMENT_ERROR, "not a proc");
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252 | }
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253 | p = mrb_proc_ptr(blk);
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254 | if (!MRB_PROC_STRICT_P(p)) {
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255 | struct RProc *p2 = (struct RProc*)mrb_obj_alloc(mrb, MRB_TT_PROC, p->c);
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256 | mrb_proc_copy(p2, p);
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257 | p2->flags |= MRB_PROC_STRICT;
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258 | return mrb_obj_value(p2);
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259 | }
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260 | return blk;
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261 | }
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262 |
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263 | void
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264 | mrb_init_proc(mrb_state *mrb)
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265 | {
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266 | struct RProc *m;
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267 | mrb_irep *call_irep = (mrb_irep *)mrb_malloc(mrb, sizeof(mrb_irep));
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268 | static const mrb_irep mrb_irep_zero = { 0 };
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269 |
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270 | *call_irep = mrb_irep_zero;
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271 | call_irep->flags = MRB_ISEQ_NO_FREE;
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272 | call_irep->iseq = call_iseq;
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273 | call_irep->ilen = 1;
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274 | call_irep->nregs = 2; /* receiver and block */
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275 |
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276 | mrb_define_class_method(mrb, mrb->proc_class, "new", mrb_proc_s_new, MRB_ARGS_ANY());
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277 | mrb_define_method(mrb, mrb->proc_class, "initialize_copy", mrb_proc_init_copy, MRB_ARGS_REQ(1));
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278 | mrb_define_method(mrb, mrb->proc_class, "arity", mrb_proc_arity, MRB_ARGS_NONE());
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279 |
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280 | m = mrb_proc_new(mrb, call_irep);
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281 | mrb_define_method_raw(mrb, mrb->proc_class, mrb_intern_lit(mrb, "call"), m);
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282 | mrb_define_method_raw(mrb, mrb->proc_class, mrb_intern_lit(mrb, "[]"), m);
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283 |
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284 | mrb_define_class_method(mrb, mrb->kernel_module, "lambda", proc_lambda, MRB_ARGS_NONE()); /* 15.3.1.2.6 */
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285 | mrb_define_method(mrb, mrb->kernel_module, "lambda", proc_lambda, MRB_ARGS_NONE()); /* 15.3.1.3.27 */
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286 | }
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