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annotate lwasm/lwasm.c @ 347:1649bc7bda5a

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Some data oriented pseudo ops added
author lost@starbug
date Sat, 27 Mar 2010 20:16:24 -0600
parents a82c55070624
children 11a95c6414b4
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1 /*
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2 lwasm.c
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3
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4 Copyright © 2010 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
344
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22 #define ___lwasm_c_seen___
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23
337
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24 #include <config.h>
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25
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26 #include <stdio.h>
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27 #include <stdarg.h>
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28 #include <string.h>
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29
337
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30 #include <lw_expr.h>
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31 #include <lw_alloc.h>
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32 #include <lw_string.h>
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33
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34 #include "lwasm.h"
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35
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36 lw_expr_t lwasm_evaluate_var(char *var, void *priv)
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37 {
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38 return NULL;
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39 }
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40
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41 lw_expr_t lwasm_evaluate_special(int t, void *ptr, void *priv)
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42 {
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43 switch (t)
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44 {
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45 case lwasm_expr_linelen:
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46 {
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47 line_t *cl = ptr;
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48 if (cl -> len == -1)
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49 return NULL;
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50 return lw_expr_build(lw_expr_type_int, cl -> len);
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51 }
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52 break;
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53
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54 case lwasm_expr_lineaddr:
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55 {
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56 line_t *cl = ptr;
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57 if (cl -> addr)
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58 return lw_expr_copy(cl -> addr);
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59 else
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60 return NULL;
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61 }
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62 }
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63 return NULL;
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64 }
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65
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66 void lwasm_register_error(asmstate_t *as, line_t *l, const char *msg, ...)
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67 {
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68 lwasm_error_t *e;
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69 va_list args;
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70 char errbuff[1024];
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71 int r;
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72
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73 if (!l)
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74 return;
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75
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76 va_start(args, msg);
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77
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78 e = lw_alloc(sizeof(lwasm_error_t));
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79
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80 e -> next = l -> err;
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81 l -> err = e;
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82
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83 as -> errorcount++;
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84
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85 r = vsnprintf(errbuff, 1024, msg, args);
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86 e -> mess = lw_strdup(errbuff);
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87
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88 va_end(args);
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89 }
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90
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91 int lwasm_next_context(asmstate_t *as)
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92 {
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93 int r;
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94 r = as -> nextcontext;
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95 as -> nextcontext++;
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96 return r;
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97 }
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98
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99 void lwasm_emit(line_t *cl, int byte)
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100 {
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101 if (cl -> outputl == cl -> outputbl)
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102 {
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103 cl -> output = lw_realloc(cl -> output, cl -> outputbl + 8);
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104 cl -> outputbl += 8;
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105 }
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106 cl -> output[cl -> outputl++] = byte & 0xff;
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107 }
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108
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109 void lwasm_emitop(line_t *cl, int opc)
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110 {
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111 if (opc > 0x100)
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112 lwasm_emit(cl, opc >> 8);
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113 lwasm_emit(cl, opc);
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114 }
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115
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116 lw_expr_t lwasm_parse_term(char **p, void *priv)
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117 {
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118 asmstate_t *as = priv;
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119 int val;
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120
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121 if (!**p)
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122 return NULL;
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123
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124 if (**p == '*' || (
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125 **p == '.'
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126 && !((*p)[1] >= 'A' && (*p)[1] <= 'Z')
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127 && !((*p)[1] >= 'a' && (*p)[1] <= 'z')
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128 && !((*p)[1] >= '0' && (*p)[1] <= '9')
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129 ))
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130 {
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131 // special "symbol" for current line addr (*, .)
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132 (*p)++;
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133 return lw_expr_build(lw_expr_type_special, lwasm_expr_lineaddr, as -> cl);
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134 }
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135
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136 // branch points
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137 if (**p == '<')
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138 {
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139 (*p)++;
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140 return lw_expr_build(lw_expr_type_special, lwasm_expr_prevbp, as -> cl);
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141 }
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142 if (**p == '>')
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143 {
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144 (*p)++;
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145 return lw_expr_build(lw_expr_type_special, lwasm_expr_nextbp, as -> cl);
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146 }
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147
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148 // double ascii constant
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149 if (**p == '"')
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150 {
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151 int v;
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152 (*p)++;
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153 if (!**p)
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154 return NULL;
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155 if (!*((*p)+1))
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156 return NULL;
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157 v = (unsigned char)**p << 8 | (unsigned char)*((*p)+1);
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158 (*p) += 2;
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159 return lw_expr_build(lw_expr_type_int, v);
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160 }
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161
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162 if (**p == '\'')
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163 {
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164 int v;
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165
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166 (*p)++;
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167 if (!**p)
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168 return NULL;
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169
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170 v = (unsigned char)**p;
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171 (*p)++;
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172 return lw_expr_build(lw_expr_type_int, v);
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173 }
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174
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175 if (**p == '&')
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176 {
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177 // decimal constant
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178 int v = 0;
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179 (*p)++;
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180
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181 if (!strchr("0123456789", **p))
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182 return NULL;
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183
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184 while (**p && strchr("0123456789", **p))
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185 {
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186 val = val * 10 + (**p - '0');
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187 (*p)++;
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188 }
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189 return lw_expr_build(lw_expr_type_int, v);
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190 }
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191
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192 if (**p == '%')
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193 {
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194 // binary constant
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195 int v = 0;
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196 (*p)++;
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197
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198 if (**p != '0' && **p != '1')
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199 return NULL;
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200
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parents: 345
diff changeset
201 while (**p && (**p == '0' || **p == '1'))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
202 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
203 val = val * 2 + (**p - '0');
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
204 (*p)++;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
205 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
206 return lw_expr_build(lw_expr_type_int, v);
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
207 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
208
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
209 if (**p == '$')
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
210 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
211 // hexadecimal constant
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
212 int v = 0, v2;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
213 (*p)++;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
214
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
215 if (!strchr("0123456789abcdefABCDEF", **p))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
216 return NULL;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
217
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
218 while (**p && strchr("0123456789abcdefABCDEF", **p))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
219 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
220 v2 = toupper(**p) - '0';
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
221 if (v2 > 9)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
222 v2 -= 7;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
223 val = val * 16 + v2;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
224 (*p)++;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
225 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
226 return lw_expr_build(lw_expr_type_int, v);
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
227 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
228
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
229 if (**p == '0' && (*((*p)+1) == 'x' || *((*p)+1) == 'X'))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
230 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
231 // hexadecimal constant, C style
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
232 int v = 0, v2;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
233 (*p)+=2;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
234
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
235 if (!strchr("0123456789abcdefABCDEF", **p))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
236 return NULL;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
237
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
238 while (**p && strchr("0123456789abcdefABCDEF", **p))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
239 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
240 v2 = toupper(**p) - '0';
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
241 if (v2 > 9)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
242 v2 -= 7;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
243 val = val * 16 + v2;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
244 (*p)++;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
245 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
246 return lw_expr_build(lw_expr_type_int, v);
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
247 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
248
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
249 if (**p == '@' && (*((*p)+1) >= '0' && *((*p)+1) <= '7'))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
250 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
251 // octal constant
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
252 int v = 0;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
253 (*p)++;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
254
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
255 if (!strchr("01234567", **p))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
256 return NULL;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
257
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
258 while (**p && strchr("01234567", **p))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
259 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
260 val = val * 8 + (**p - '0');
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
261 (*p)++;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
262 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
263 return lw_expr_build(lw_expr_type_int, v);
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
264 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
265
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
266
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
267 // symbol or bare decimal or suffix constant here
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
268 do
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
269 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
270 int havedol = 0;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
271 int l = 0;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
272
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
273 while ((*p)[l] && strchr(SYMCHARS, (*p)[l]))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
274 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
275 if ((*p)[l] == '$')
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
276 havedol = 1;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
277 l++;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
278 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
279 if (l == 0)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
280 return NULL;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
281
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
282 if (havedol || **p < '0' || **p > '9')
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
283 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
284 // have a symbol here
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
285 char *sym;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
286 lw_expr_t term;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
287
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
288 sym = lw_strndup(*p, l);
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
289 (*p) += l;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
290 term = lw_expr_build(lw_expr_type_var, sym);
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
291 lw_free(sym);
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
292 return term;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
293 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
294 } while (0);
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
295
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
296 if (!**p)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
297 return NULL;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
298
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
299 // we have a numeric constant here, either decimal or postfix base notation
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
300 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
301 int decval = 0, binval = 0, hexval = 0, octval = 0;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
302 int valtype = 15; // 1 = bin, 2 = oct, 4 = dec, 8 = hex
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
303 int bindone = 0;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
304 int val;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
305 int dval;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
306
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
307 while (1)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
308 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
309 if (!**p || !strchr("0123456789ABCDEFabcdefqhoQHO", **p))
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
310 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
311 // we can legally be bin or decimal here
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
312 if (bindone)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
313 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
314 // just finished a binary value
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
315 val = binval;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
316 break;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
317 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
318 else if (valtype & 4)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
319 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
320 val = decval;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
321 break;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
322 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
323 else
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
324 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
325 // bad value
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
326 return NULL;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
327 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
328 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
329
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
330 dval = toupper(**p);
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
331 (*p)++;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
332
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
333 if (bindone)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
334 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
335 // any characters past "B" means it is not binary
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
336 bindone = 0;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
337 valtype &= 14;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
338 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
339
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
340 switch (dval)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
341 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
342 case 'Q':
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
343 case 'O':
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
344 if (valtype & 2)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
345 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
346 val = octval;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
347 valtype = -1;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
348 break;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
349 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
350 else
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
351 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
352 return NULL;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
353 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
354 /* can't get here */
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
355
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
356 case 'H':
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
357 if (valtype & 8)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
358 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
359 val = hexval;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
360 valtype = -1;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
361 break;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
362 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
363 else
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
364 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
365 return NULL;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
366 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
367 /* can't get here */
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
368
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
369 case 'B':
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
370 // this is a bit of a sticky one since B may be a
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
371 // hex number instead of the end of a binary number
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
372 // so it falls through to the digit case
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
373 if (valtype & 1)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
374 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
375 // could still be binary of hex
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
376 bindone = 1;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
377 valtype = 9;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
378 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
379 /* fall through intented */
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
380
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
381 default:
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
382 // digit
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
383 dval -= '0';
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
384 if (dval > 9)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
385 dval -= 7;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
386 if (valtype & 8)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
387 hexval = hexval * 16 + dval;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
388 if (valtype & 4)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
389 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
390 if (dval > 9)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
391 valtype &= 11;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
392 else
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
393 decval = decval * 10 + dval;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
394 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
395 if (valtype & 2)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
396 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
397 if (dval > 7)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
398 valtype &= 13;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
399 else
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
400 octval = octval * 8 + dval;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
401 }
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
402 if (valtype & 1)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
403 {
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
404 if (dval > 1)
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
405 valtype &= 14;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
406 else
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
407 binval = binval * 2 + dval;
a82c55070624 Added expression parsing infrastructure and misc fixes
lost@starbug
parents: 345
diff changeset
408 }
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409 }
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410 if (valtype == -1)
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411 break;
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412
a82c55070624 Added expression parsing infrastructure and misc fixes
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413 // return if no more valid types
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414 if (valtype == 0)
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415 return NULL;
a82c55070624 Added expression parsing infrastructure and misc fixes
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416
a82c55070624 Added expression parsing infrastructure and misc fixes
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417 val = decval; // in case we fall through
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418 }
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419
a82c55070624 Added expression parsing infrastructure and misc fixes
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420 // get here if we have a value
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421 return lw_expr_build(lw_expr_type_int, val);
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422 }
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423 // can't get here
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424 }
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425
a82c55070624 Added expression parsing infrastructure and misc fixes
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diff changeset
426 lw_expr_t lwasm_parse_expr(asmstate_t *as, char **p)
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427 {
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428 lw_expr_t e;
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429
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430 e = lw_expr_parse(p, as);
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431
a82c55070624 Added expression parsing infrastructure and misc fixes
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432 return e;
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433 }
347
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434
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435 void lwasm_save_expr(line_t *cl, int id, lw_expr_t expr)
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436 {
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diff changeset
437 struct line_expr_s *e;
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438
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439 for (e = cl -> exprs; e; e = e -> next)
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440 {
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441 if (e -> id == id)
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442 {
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443 lw_expr_destroy(e -> expr);
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444 e -> expr = expr;
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445 return;
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446 }
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447 }
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448
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449 e = lw_alloc(sizeof(struct line_expr_s));
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450 e -> expr = expr;
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diff changeset
451 e -> id = id;
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diff changeset
452 e -> next = cl -> exprs;
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diff changeset
453 cl -> exprs = e;
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454 }
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455
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diff changeset
456 lw_expr_t lwasm_fetch_expr(line_t *cl, int id)
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457 {
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diff changeset
458 struct line_expr_s *e;
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459
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diff changeset
460 for (e = cl -> exprs; e; e = e -> next)
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461 {
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462 if (e -> id == id)
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463 {
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464 return e -> expr;
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465 }
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466 }
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467 return NULL;
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468 }
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469
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diff changeset
470 void skip_operand(char **p)
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471 {
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472 for (; **p && !isspace(**p); (*p)++)
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473 /* do nothing */ ;
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474 }
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475
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diff changeset
476 int lwasm_emitexpr(line_t *l, lw_expr_t expr, int size)
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477 {
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diff changeset
478 int v;
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479
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diff changeset
480 if (lw_expr_istype(expr, lw_expr_type_int))
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481 {
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diff changeset
482 v = lw_expr_intval(expr);
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483 }
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diff changeset
484 else
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485 {
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diff changeset
486 lwasm_register_error(l -> as, l, "Expression not fully resolved");
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487 return -1;
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488 }
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diff changeset
489
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diff changeset
490 switch (size)
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491 {
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492 case 4:
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493 lwasm_emit(l, v >> 24);
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494 lwasm_emit(l, v >> 16);
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diff changeset
495 /* fallthrough intended */
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496
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497 case 2:
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498 lwasm_emit(l, v >> 8);
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499 /* fallthrough intended */
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500
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diff changeset
501 case 1:
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diff changeset
502 lwasm_emit(l, v);
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503 }
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diff changeset
504
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505 return 0;
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diff changeset
506 }