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annotate lwasm/lwval.c @ 237:dca5938a64aa

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Updated documentation to reflect recent udates to LWASM
author lost
date Fri, 14 Aug 2009 04:20:15 +0000
parents bae1e3ecdce1
children
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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 #include <config.h>
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27
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28 #include <malloc.h>
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29
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30 #define __lwval_c_seen__
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31 #include "lwval.h"
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32
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33 LWVAL *lwval_construct_int(int value)
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34 {
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35 LWVAL *v;
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36
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37 v = malloc(sizeof(LWVAL));
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38 if (!v)
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39 return NULL;
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40
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41 v -> lwval_type = LWVAL_TYPE_INT;
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42 v -> dt.lwval_int = value;
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43
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44 return v;
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45 }
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46
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47 LWVAL *lwval_construct_err(int errno)
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48 {
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49 LWVAL *v;
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50
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51 v = malloc(sizeof(LWVAL));
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52 if (!v)
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53 return NULL;
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54
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55 v -> lwval_type = LWVAL_TYPE_ERR;
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56 v -> dt.lwval_int = errno;
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57
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58 return v;
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59 }
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60
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61 LWVAL *lwval_construct_nan(void)
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62 {
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63 LWVAL *v;
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64
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65 v = malloc(sizeof(LWVAL));
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66 if (!v)
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67 return NULL;
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68
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69 v -> lwval_type = LWVAL_TYPE_NAN;
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70
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71 return v;
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72 }
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73
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74 LWVAL *lwval_construct_undef(void)
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75 {
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76 LWVAL *v;
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77
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78 v = malloc(sizeof(LWVAL));
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79 if (!v)
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80 return NULL;
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81
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82 v -> lwval_type = LWVAL_TYPE_UNDEF;
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83
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84 return v;
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85 }
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86
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87 LWVAL *lwval_construct_expr(LWVAL *v1, LWVAL *v2, int op)
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88 {
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89 LWVAL *v;
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90 v = malloc(sizeof(LWVAL));
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91 if (!v)
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92 return NULL;
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93
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94 v -> lwval_type = LWVAL_TYPE_EXPR;
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95 v -> dt.expr.v1 = v1;
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96 v -> dt.expr.v2 = v2;
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97 v -> dt.expr.op = op;
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98 return v;
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99 }
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100
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101 void lwval_destroy(LWVAL *value)
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102 {
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103 if (value)
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104 {
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105 lwval_clear(value);
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106 free(value);
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107 }
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108 }
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109
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110 // performs a deep copy of an LWVAL, including ALL referenced values
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111 void lwval_dup(LWVAL *v1, LWVAL *v2)
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112 {
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113 lwval_clear(v2);
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114
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115 switch (v1 -> lwval_type)
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116 {
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117 case LWVAL_TYPE_INT:
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118 case LWVAL_TYPE_ERR:
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119 v2 -> dt.lwval_int = v1 -> dt.lwval_int;
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120 break;
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121
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122 case LWVAL_TYPE_EXPR:
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123 v2 -> dt.expr.op = v1 -> dt.expr.op;
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124 if (v1 -> dt.expr.v1)
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125 {
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126 v2 -> dt.expr.v1 = lwval_construct_undef();
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127 lwval_dup(v1 -> dt.expr.v1, v2 -> dt.expr.v1);
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128 }
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129 else
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130 v2 -> dt.expr.v1 = NULL;
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131 if (v1 -> dt.expr.v2)
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132 {
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133 v2 -> dt.expr.v2 = lwval_construct_undef();
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134 lwval_dup(v1 -> dt.expr.v2, v2 -> dt.expr.v2);
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135 }
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136 else
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137 v2 -> dt.expr.v2 = NULL;
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138 break;
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139 }
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140
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141 v2 -> lwval_type = v1 -> lwval_type;
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142 }
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143
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144 void lwval_clear(LWVAL *value)
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145 {
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146 switch (value -> lwval_type)
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147 {
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148 case LWVAL_TYPE_EXPR:
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149 lwval_destroy(value -> dt.expr.v1);
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150 lwval_destroy(value -> dt.expr.v2);
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151 break;
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152 }
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153 value -> lwval_type = LWVAL_TYPE_UNDEF;
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154 }
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155
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156 // for integer, simply negate value
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157 // for expr, change to "-1 * (expr)"
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158 // everything else: error
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159 LWVAL *lwval_neg(LWVAL *v1)
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160 {
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161 switch (v1 -> lwval_type)
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162 {
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163 case LWVAL_TYPE_INT:
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164 v1 -> dt.lwval_int = -(v1 -> dt.lwval_int);
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165 break;
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166
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167 case LWVAL_TYPE_EXPR:
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168 {
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169 LWVAL *v, *v2;
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170 v = lwval_construct_undef();
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171 lwval_dup(v1, v);
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172 lwval_clear(v1);
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173 v2 = lwval_construct_expr(lwval_construct_int(-1), v, '*');
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174 lwval_dup(v2, v1);
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175 lwval_destroy(v2);
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176 }
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177 break;
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178
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179 default:
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180 lwval_clear(v1);
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181 v1 -> lwval_type = LWVAL_TYPE_ERR;
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182 v1 -> dt.lwval_int = 1;
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183 }
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184
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185 return v1;
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186 }
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187
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188 // v1 + v2 -> v1
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189 LWVAL *lwval_add(LWVAL *v1, LWVAL *v2)
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190 {
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191 }
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192
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193 // v1 - v2 -> v1
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194 LWVAL *lwval_sub(LWVAL *v1, LWVAL *v2)
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195 {
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196 }
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197
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198 // v1 * v2 -> v1
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199 LWVAL *lwval_mul(LWVAL *v1, LWVAL *v2)
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200 {
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201 }
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202
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203 // v1 / v2 -> v1
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204 LWVAL *lwval_div(LWVAL *v1, LWVAL *v2)
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205 {
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206 }
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207
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208 // v1 % v2 -> v1
1f598d89b9b0 Started creating expression parser
lost
parents: 14
diff changeset
209 LWVAL *lwval_mod(LWVAL *v1, LWVAL *v2)
14
b28d7cb60779 checkpoint
lost
parents: 13
diff changeset
210 {
b28d7cb60779 checkpoint
lost
parents: 13
diff changeset
211 }