1 | #include "mruby.h"
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2 | #include "mruby/class.h"
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3 | #include "mruby/compile.h"
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4 | #include "mruby/irep.h"
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5 | #include "mruby/proc.h"
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6 | #include "mruby/opcode.h"
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7 |
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8 | static struct mrb_irep *
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9 | get_closure_irep(mrb_state *mrb, int level)
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10 | {
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11 | struct mrb_context *c = mrb->c;
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12 | struct REnv *e = c->ci[-1].proc->env;
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13 | struct RProc *proc;
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14 |
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15 | if (level == 0) {
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16 | proc = c->ci[-1].proc;
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17 | if (MRB_PROC_CFUNC_P(proc)) {
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18 | return NULL;
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19 | }
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20 | return proc->body.irep;
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21 | }
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22 |
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23 | while (--level) {
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24 | e = (struct REnv*)e->c;
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25 | if (!e) return NULL;
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26 | }
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27 |
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28 | if (!e) return NULL;
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29 | proc = c->cibase[e->cioff].proc;
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30 |
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31 | if (!proc || MRB_PROC_CFUNC_P(proc)) {
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32 | return NULL;
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33 | }
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34 | return proc->body.irep;
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35 | }
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36 |
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37 | static inline mrb_code
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38 | search_variable(mrb_state *mrb, mrb_sym vsym, int bnest)
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39 | {
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40 | mrb_irep *virep;
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41 | int level;
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42 | int pos;
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43 |
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44 | for (level = 0; (virep = get_closure_irep(mrb, level)); level++) {
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45 | if (!virep || virep->lv == NULL) {
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46 | continue;
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47 | }
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48 | for (pos = 0; pos < virep->nlocals - 1; pos++) {
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49 | if (vsym == virep->lv[pos].name) {
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50 | return (MKARG_B(pos + 1) | MKARG_C(level + bnest));
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51 | }
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52 | }
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53 | }
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54 |
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55 | return 0;
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56 | }
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57 |
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58 | static mrb_bool
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59 | potential_upvar_p(struct mrb_locals *lv, uint16_t v, int argc, uint16_t nlocals)
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60 | {
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61 | if (v >= nlocals) return FALSE;
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62 | /* skip arguments */
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63 | if (v < argc+1) return FALSE;
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64 | return TRUE;
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65 | }
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66 |
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67 | static void
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68 | patch_irep(mrb_state *mrb, mrb_irep *irep, int bnest)
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69 | {
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70 | size_t i;
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71 | mrb_code c;
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72 | int argc = 0;
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73 |
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74 | for (i = 0; i < irep->ilen; i++) {
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75 | c = irep->iseq[i];
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76 | switch(GET_OPCODE(c)){
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77 | case OP_ENTER:
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78 | {
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79 | mrb_aspec ax = GETARG_Ax(c);
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80 | /* extra 1 means a slot for block */
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81 | argc = MRB_ASPEC_REQ(ax)+MRB_ASPEC_OPT(ax)+MRB_ASPEC_REST(ax)+MRB_ASPEC_POST(ax)+1;
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82 | }
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83 | break;
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84 |
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85 | case OP_EPUSH:
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86 | patch_irep(mrb, irep->reps[GETARG_Bx(c)], bnest + 1);
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87 | break;
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88 |
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89 | case OP_LAMBDA:
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90 | {
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91 | int arg_c = GETARG_c(c);
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92 | if (arg_c & OP_L_CAPTURE) {
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93 | patch_irep(mrb, irep->reps[GETARG_b(c)], bnest + 1);
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94 | }
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95 | }
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96 | break;
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97 |
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98 | case OP_SEND:
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99 | if (GETARG_C(c) != 0) {
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100 | break;
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101 | }
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102 | {
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103 | mrb_code arg = search_variable(mrb, irep->syms[GETARG_B(c)], bnest);
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104 | if (arg != 0) {
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105 | /* must replace */
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106 | irep->iseq[i] = MKOPCODE(OP_GETUPVAR) | MKARG_A(GETARG_A(c)) | arg;
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107 | }
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108 | }
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109 | break;
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110 |
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111 | case OP_MOVE:
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112 | /* src part */
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113 | if (potential_upvar_p(irep->lv, GETARG_B(c), argc, irep->nlocals)) {
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114 | mrb_code arg = search_variable(mrb, irep->lv[GETARG_B(c) - 1].name, bnest);
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115 | if (arg != 0) {
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116 | /* must replace */
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117 | irep->iseq[i] = MKOPCODE(OP_GETUPVAR) | MKARG_A(GETARG_A(c)) | arg;
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118 | }
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119 | }
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120 | /* dst part */
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121 | if (potential_upvar_p(irep->lv, GETARG_A(c), argc, irep->nlocals)) {
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122 | mrb_code arg = search_variable(mrb, irep->lv[GETARG_A(c) - 1].name, bnest);
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123 | if (arg != 0) {
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124 | /* must replace */
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125 | irep->iseq[i] = MKOPCODE(OP_SETUPVAR) | MKARG_A(GETARG_B(c)) | arg;
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126 | }
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127 | }
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128 | break;
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129 | }
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130 | }
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131 | }
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132 |
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133 | static struct RProc*
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134 | create_proc_from_string(mrb_state *mrb, char *s, int len, mrb_value binding, char *file, mrb_int line)
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135 | {
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136 | mrbc_context *cxt;
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137 | struct mrb_parser_state *p;
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138 | struct RProc *proc;
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139 | struct REnv *e;
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140 | struct mrb_context *c = mrb->c;
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141 |
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142 | if (!mrb_nil_p(binding)) {
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143 | mrb_raise(mrb, E_ARGUMENT_ERROR, "Binding of eval must be nil.");
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144 | }
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145 |
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146 | cxt = mrbc_context_new(mrb);
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147 | cxt->lineno = line;
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148 | if (file) {
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149 | mrbc_filename(mrb, cxt, file);
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150 | }
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151 | cxt->capture_errors = TRUE;
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152 | cxt->no_optimize = TRUE;
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153 |
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154 | p = mrb_parse_nstring(mrb, s, len, cxt);
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155 |
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156 | /* only occur when memory ran out */
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157 | if (!p) {
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158 | mrb_raise(mrb, E_RUNTIME_ERROR, "Failed to create parser state.");
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159 | }
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160 |
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161 | if (0 < p->nerr) {
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162 | /* parse error */
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163 | char buf[256];
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164 | int n;
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165 | n = snprintf(buf, sizeof(buf), "line %d: %s\n", p->error_buffer[0].lineno, p->error_buffer[0].message);
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166 | mrb_parser_free(p);
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167 | mrbc_context_free(mrb, cxt);
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168 | mrb_exc_raise(mrb, mrb_exc_new(mrb, E_SYNTAX_ERROR, buf, n));
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169 | }
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170 |
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171 | proc = mrb_generate_code(mrb, p);
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172 | if (proc == NULL) {
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173 | /* codegen error */
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174 | mrb_parser_free(p);
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175 | mrbc_context_free(mrb, cxt);
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176 | mrb_raise(mrb, E_SCRIPT_ERROR, "codegen error");
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177 | }
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178 | if (c->ci[-1].proc->target_class) {
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179 | proc->target_class = c->ci[-1].proc->target_class;
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180 | }
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181 | e = c->ci[-1].proc->env;
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182 | if (!e) e = c->ci[-1].env;
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183 | e = (struct REnv*)mrb_obj_alloc(mrb, MRB_TT_ENV, (struct RClass*)e);
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184 | e->mid = c->ci[-1].mid;
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185 | e->cioff = c->ci - c->cibase - 1;
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186 | e->stack = c->ci->stackent;
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187 | MRB_SET_ENV_STACK_LEN(e, c->ci[-1].proc->body.irep->nlocals);
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188 | c->ci->env = e;
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189 | proc->env = e;
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190 | patch_irep(mrb, proc->body.irep, 0);
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191 |
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192 | mrb_parser_free(p);
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193 | mrbc_context_free(mrb, cxt);
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194 |
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195 | return proc;
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196 | }
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197 |
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198 | static mrb_value
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199 | f_eval(mrb_state *mrb, mrb_value self)
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200 | {
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201 | char *s;
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202 | mrb_int len;
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203 | mrb_value binding = mrb_nil_value();
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204 | char *file = NULL;
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205 | mrb_int line = 1;
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206 | mrb_value ret;
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207 | struct RProc *proc;
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208 |
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209 | mrb_get_args(mrb, "s|ozi", &s, &len, &binding, &file, &line);
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210 |
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211 | proc = create_proc_from_string(mrb, s, len, binding, file, line);
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212 | ret = mrb_toplevel_run(mrb, proc);
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213 | if (mrb->exc) {
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214 | mrb_exc_raise(mrb, mrb_obj_value(mrb->exc));
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215 | }
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216 |
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217 | return ret;
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218 | }
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219 |
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220 | mrb_value mrb_obj_instance_eval(mrb_state *mrb, mrb_value self);
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221 |
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222 | #define CI_ACC_SKIP -1
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223 |
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224 | static mrb_value
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225 | f_instance_eval(mrb_state *mrb, mrb_value self)
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226 | {
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227 | struct mrb_context *c = mrb->c;
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228 | mrb_value b;
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229 | mrb_int argc; mrb_value *argv;
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230 |
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231 | mrb_get_args(mrb, "*&", &argv, &argc, &b);
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232 |
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233 | if (mrb_nil_p(b)) {
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234 | char *s;
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235 | mrb_int len;
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236 | char *file = NULL;
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237 | mrb_int line = 1;
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238 | mrb_value cv;
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239 |
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240 | mrb_get_args(mrb, "s|zi", &s, &len, &file, &line);
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241 | c->ci->acc = CI_ACC_SKIP;
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242 | cv = mrb_singleton_class(mrb, self);
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243 | c->ci->target_class = mrb_class_ptr(cv);
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244 | return mrb_run(mrb, create_proc_from_string(mrb, s, len, mrb_nil_value(), file, line), self);
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245 | }
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246 | else {
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247 | mrb_get_args(mrb, "&", &b);
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248 | return mrb_obj_instance_eval(mrb, self);
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249 | }
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250 | }
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251 |
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252 | void
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253 | mrb_mruby_eval_gem_init(mrb_state* mrb)
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254 | {
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255 | mrb_define_module_function(mrb, mrb->kernel_module, "eval", f_eval, MRB_ARGS_ARG(1, 3));
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256 | mrb_define_method(mrb, mrb->kernel_module, "instance_eval", f_instance_eval, MRB_ARGS_ARG(1, 2));
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257 | }
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258 |
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259 | void
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260 | mrb_mruby_eval_gem_final(mrb_state* mrb)
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261 | {
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262 | }
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