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4223
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1 #include "expr.h"
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2 #include "main_opt.h"
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3 #include "sub.h"
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4 #include "transmogrify.h"
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5 #include "xmalloc.h"
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6
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7 #include <stddef.h>
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8
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9 struct sub {
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10 struct expr *expr;
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11 size_t refs;
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12 size_t id;
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13 };
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14
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15 static struct expr *dup(const struct expr *e) {
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16 struct expr *p;
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17
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18 if (!e) {
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19 return NULL;
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20 }
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21
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22 p = xmalloc(1, sizeof *p);
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23 *p = *e;
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24
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25 switch (e->type) {
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26 case literE:
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27 p->v.val = v_undef();
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28 v_set(p->v.val, e->v.val);
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29 break;
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30
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31 case varE:
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32 break;
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33
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34 case varhashE:
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35 p->right = dup(e->right);
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36 break;
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37
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38 case symbolE:
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39 switch (e->op) {
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40 case S_ARGV:
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41 p->right = dup(e->right);
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42 break;
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43 }
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44 break;
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45
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46 case unopE:
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47 p->right = dup(e->right);
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48 if (e->op == F_MATCH) {
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49 p->left.rx = re_dup(e->left.rx);
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50 }
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51 break;
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52
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53 case binopE:
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54 case listE:
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55 p->right = dup(e->right);
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56 p->left.expr = dup(e->left.expr);
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57 break;
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58 }
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59
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60 return p;
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61 }
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62
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63 static void solid(struct expr *e) {
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64 if (!e) {
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65 return;
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66 }
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67
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68 switch (e->type) {
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69 case literE:
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70 break;
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71
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72 case varE:
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73 e->v.val = eval_expr(e);
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74 e->type = literE;
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75 break;
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76
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77 case varhashE:
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78 break;
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79
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80 case symbolE:
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81 switch (e->op) {
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82 case S_ARGV:
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83 solid(e->right);
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84 break;
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85 }
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86 break;
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87
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88 case unopE:
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89 solid(e->right);
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90 break;
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91
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92 case binopE:
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93 case listE:
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94 solid(e->left.expr);
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95 solid(e->right);
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96 break;
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97 }
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98 }
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99
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100 struct sub *sub_new(const struct expr *e) {
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101 static size_t idcount;
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102 struct sub *p;
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103 p = xmalloc(1, sizeof *p);
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104 p->expr = dup(e);
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105 solid(p->expr);
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106 if (!Opt.unoptimize) {
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107 trans_fold(&p->expr);
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108 }
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109 p->refs = 0;
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110 p->id = idcount++;
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111 return p;
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112 }
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113
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114 struct sub *sub_incr(struct sub *p) {
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115 ++p->refs;
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116 return p;
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117 }
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118
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119 void sub_decr(struct sub *p) {
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120 if (!p->refs) {
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121 free_expr(p->expr);
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122 xfree(p);
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123 return;
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124 }
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125 --p->refs;
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126 }
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127
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128 struct expr *sub_expr(const struct sub *p) {
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129 return p->expr;
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130 }
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131
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132 size_t sub_id(const struct sub *p) {
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133 return p->id;
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134 }
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