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annotate src/lwval.c @ 112:a567dbb3f1d4

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author lost
date Sat, 17 Jan 2009 16:55:53 +0000
parents 1f598d89b9b0
children
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13
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1 /*
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2 lwval.c
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3 Copyright © 2008 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19 */
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20
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21 /*
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22 This file contains implementations associated with the expression evaluator
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23 used by LWASM.
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24
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25 */
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26
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27 #include <malloc.h>
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28
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29 #define __lwval_c_seen__
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30 #include "lwval.h"
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31
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32 LWVAL *lwval_construct_int(int value)
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33 {
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34 LWVAL *v;
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35
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36 v = malloc(sizeof(LWVAL));
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37 if (!v)
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38 return NULL;
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39
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40 v -> lwval_type = LWVAL_TYPE_INT;
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41 v -> dt.lwval_int = value;
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42
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43 return v;
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44 }
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45
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46 LWVAL *lwval_construct_err(int errno)
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47 {
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48 LWVAL *v;
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49
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50 v = malloc(sizeof(LWVAL));
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51 if (!v)
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52 return NULL;
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53
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54 v -> lwval_type = LWVAL_TYPE_ERR;
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55 v -> dt.lwval_int = errno;
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56
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57 return v;
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58 }
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59
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60 LWVAL *lwval_construct_nan(void)
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61 {
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62 LWVAL *v;
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63
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64 v = malloc(sizeof(LWVAL));
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65 if (!v)
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66 return NULL;
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67
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68 v -> lwval_type = LWVAL_TYPE_NAN;
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69
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70 return v;
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71 }
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72
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73 LWVAL *lwval_construct_undef(void)
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74 {
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75 LWVAL *v;
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76
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77 v = malloc(sizeof(LWVAL));
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78 if (!v)
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79 return NULL;
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80
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81 v -> lwval_type = LWVAL_TYPE_UNDEF;
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82
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83 return v;
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84 }
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85
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86 LWVAL *lwval_construct_expr(LWVAL *v1, LWVAL *v2, int op)
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87 {
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88 LWVAL *v;
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89 v = malloc(sizeof(LWVAL));
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90 if (!v)
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91 return NULL;
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92
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93 v -> lwval_type = LWVAL_TYPE_EXPR;
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94 v -> dt.expr.v1 = v1;
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95 v -> dt.expr.v2 = v2;
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96 v -> dt.expr.op = op;
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97 return v;
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98 }
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99
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100 void lwval_destroy(LWVAL *value)
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101 {
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102 if (value)
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103 {
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104 lwval_clear(value);
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105 free(value);
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106 }
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107 }
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108
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109 // performs a deep copy of an LWVAL, including ALL referenced values
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110 void lwval_dup(LWVAL *v1, LWVAL *v2)
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111 {
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112 lwval_clear(v2);
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113
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114 switch (v1 -> lwval_type)
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115 {
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116 case LWVAL_TYPE_INT:
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117 case LWVAL_TYPE_ERR:
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118 v2 -> dt.lwval_int = v1 -> dt.lwval_int;
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119 break;
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120
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121 case LWVAL_TYPE_EXPR:
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122 v2 -> dt.expr.op = v1 -> dt.expr.op;
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123 if (v1 -> dt.expr.v1)
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124 {
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125 v2 -> dt.expr.v1 = lwval_construct_undef();
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126 lwval_dup(v1 -> dt.expr.v1, v2 -> dt.expr.v1);
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127 }
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128 else
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129 v2 -> dt.expr.v1 = NULL;
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130 if (v1 -> dt.expr.v2)
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131 {
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132 v2 -> dt.expr.v2 = lwval_construct_undef();
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133 lwval_dup(v1 -> dt.expr.v2, v2 -> dt.expr.v2);
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134 }
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135 else
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136 v2 -> dt.expr.v2 = NULL;
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137 break;
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138 }
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139
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140 v2 -> lwval_type = v1 -> lwval_type;
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141 }
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142
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143 void lwval_clear(LWVAL *value)
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144 {
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145 switch (value -> lwval_type)
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146 {
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147 case LWVAL_TYPE_EXPR:
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148 lwval_destroy(value -> dt.expr.v1);
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149 lwval_destroy(value -> dt.expr.v2);
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150 break;
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151 }
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152 value -> lwval_type = LWVAL_TYPE_UNDEF;
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153 }
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154
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155 // for integer, simply negate value
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156 // for expr, change to "-1 * (expr)"
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157 // everything else: error
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158 LWVAL *lwval_neg(LWVAL *v1)
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159 {
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160 switch (v1 -> lwval_type)
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161 {
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162 case LWVAL_TYPE_INT:
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163 v1 -> dt.lwval_int = -(v1 -> dt.lwval_int);
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164 break;
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165
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166 case LWVAL_TYPE_EXPR:
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167 {
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168 LWVAL *v, *v2;
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169 v = lwval_construct_undef();
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170 lwval_dup(v1, v);
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171 lwval_clear(v1);
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172 v2 = lwval_construct_expr(lwval_construct_int(-1), v, '*');
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173 lwval_dup(v2, v1);
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174 lwval_destroy(v2);
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175 }
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176 break;
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177
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178 default:
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179 lwval_clear(v1);
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180 v1 -> lwval_type = LWVAL_TYPE_ERR;
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181 v1 -> dt.lwval_int = 1;
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182 }
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183
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184 return v1;
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185 }
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186
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187 // v1 + v2 -> v1
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188 LWVAL *lwval_add(LWVAL *v1, LWVAL *v2)
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189 {
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190 }
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191
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192 // v1 - v2 -> v1
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193 LWVAL *lwval_sub(LWVAL *v1, LWVAL *v2)
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194 {
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195 }
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196
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197 // v1 * v2 -> v1
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198 LWVAL *lwval_mul(LWVAL *v1, LWVAL *v2)
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199 {
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200 }
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201
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202 // v1 / v2 -> v1
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203 LWVAL *lwval_div(LWVAL *v1, LWVAL *v2)
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204 {
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205 }
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206
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207 // v1 % v2 -> v1
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208 LWVAL *lwval_mod(LWVAL *v1, LWVAL *v2)
14
b28d7cb60779 checkpoint
lost
parents: 13
diff changeset
209 {
b28d7cb60779 checkpoint
lost
parents: 13
diff changeset
210 }