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annotate lwcc/tree.c @ 501:f3e9732973f1

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Add basic integer operations to lwcc Add +, -, *, and / to lwcc parser and code generator. Multiplication and division require helper functions in a yet to be created support library. These operations are integer only for the moment.
author William Astle <lost@l-w.ca>
date Tue, 24 Sep 2019 22:07:56 -0600
parents 1bd2d590d734
children 14a40f8bb4eb
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1 /*
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2 lwcc/tree.c
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3
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4 Copyright © 2013 William Astle
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5
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6 This file is part of LWTOOLS.
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7
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 terms of the GNU General Public License as published by the Free Software
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10 Foundation, either version 3 of the License, or (at your option) any later
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11 version.
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12
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13 This program is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 more details.
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17
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18 You should have received a copy of the GNU General Public License along with
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19 this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #include <stdarg.h>
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23 #include <string.h>
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24 #include <lw_alloc.h>
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25 #include <lw_string.h>
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26
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27 #include "tree.h"
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28
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29 static char *node_names[] = {
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30 "NONE",
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31 "PROGRAM",
314
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32 "DECL",
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33 "TYPE_CHAR",
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34 "TYPE_SHORT",
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35 "TYPE_INT",
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36 "TYPE_LONG",
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37 "TYPE_LONGLONG",
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38 "IDENT",
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39 "TYPE_PTR",
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40 "TYPE_SCHAR",
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41 "TYPE_UCHAR",
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42 "TYPE_USHORT",
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43 "TYPE_UINT",
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44 "TYPE_ULONG",
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45 "TYPE_ULONGLONG",
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46 "TYPE_VOID",
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47 "TYPE_FLOAT",
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48 "TYPE_DOUBLE",
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49 "TYPE_LDOUBLE",
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50 "FUNDEF",
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51 "FUNDECL",
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52 "FUNARGS",
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53 "BLOCK",
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54 "STMT_RETURN",
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55 "CONST_INT",
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56 "OPER_PLUS",
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57 "OPER_MINUS",
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58 "OPER_TIMES",
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59 "OPER_DIVIDE",
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60 };
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61
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62
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63
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64 node_t *node_create(int type, ...)
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65 {
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66 node_t *r;
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67 int nargs = 0;
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68 va_list args;
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69
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70 va_start(args, type);
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71 r = lw_alloc(sizeof(node_t));
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72 memset(r, 0, sizeof(node_t));
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73 r -> type = type;
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74
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75 switch (type)
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76 {
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77 case NODE_OPER_PLUS:
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78 case NODE_OPER_MINUS:
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79 case NODE_OPER_TIMES:
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80 case NODE_OPER_DIVIDE:
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81 nargs = 2;
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82 break;
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83
314
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84 case NODE_DECL:
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85 nargs = 2;
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86 break;
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87
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88 case NODE_TYPE_PTR:
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89 nargs = 1;
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90 break;
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91
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92 case NODE_IDENT:
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93 case NODE_CONST_INT:
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94 r -> strval = lw_strdup(va_arg(args, char *));
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95 break;
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96
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97 case NODE_FUNDEF:
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98 nargs = 4;
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99 break;
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100
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101 case NODE_FUNDECL:
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102 nargs = 3;
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103 break;
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104 }
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105
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106 while (nargs--)
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107 {
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108 node_addchild(r, va_arg(args, node_t *));
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109 }
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110 va_end(args);
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111 return r;
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112 }
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113
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114 void node_destroy(node_t *node)
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115 {
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116 node_t *n;
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117
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118 while (node -> children)
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119 {
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120 n = node -> children -> next_child;
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121 node_destroy(node -> children);
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122 node -> children = n;
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123 }
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124 lw_free(node -> strval);
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125 lw_free(node);
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126 }
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127
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128 void node_addchild(node_t *node, node_t *nn)
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129 {
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130 node_t *tmp;
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131
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132 if (!nn)
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133 return;
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134
312
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135 nn -> parent = node;
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136 nn -> next_child = NULL;
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137 if (node -> children)
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138 {
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139 for (tmp = node -> children; tmp -> next_child; tmp = tmp -> next_child)
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140 /* do nothing */ ;
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141 tmp -> next_child = nn;
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142 }
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143 else
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144 {
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145 node -> children = nn;
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146 }
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147 }
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148
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149 void node_removechild(node_t *node, node_t *nn)
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150 {
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151 node_t **pp;
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152 node_t *np;
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153
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154 if (!node)
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155 node = nn -> parent;
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156
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157 pp = &(node -> children);
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158 for (np = node -> children; np; np = np -> next_child)
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159 {
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160 if (np -> next_child == nn)
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161 break;
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162 pp = &((*pp) -> next_child);
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163 }
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164 if (!np)
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165 return;
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166
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167 *pp = nn -> next_child;
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168 nn -> parent = NULL;
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169 nn -> next_child = NULL;
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170 }
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171
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172 void node_removechild_destroy(node_t *node, node_t *nn)
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173 {
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174 node_removechild(node, nn);
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175 node_destroy(nn);
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176 }
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177
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178 static void node_display_aux(node_t *node, FILE *f, int level)
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179 {
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180 node_t *nn;
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181 int i;
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182
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183 for (i = 0; i < level * 4; i++)
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184 fputc(' ', f);
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185 fprintf(f, "(%s ", node_names[node -> type]);
314
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186 if (node -> strval)
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187 fprintf(f, "\"%s\" ", node -> strval);
312
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188 fputc('\n', f);
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189 for (nn = node -> children; nn; nn = nn -> next_child)
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190 node_display_aux(nn, f, level + 1);
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191 for (i = 0; i < level * 4; i++)
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192 fputc(' ', f);
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193 fputc(')', f);
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194 fputc('\n', f);
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195 }
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196
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197 void node_display(node_t *node, FILE *f)
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198 {
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199 node_display_aux(node, f, 0);
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200 }