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347
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1 /*
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2 pseudo.c
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3 Copyright © 2010 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 #include <config.h>
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23
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24 #include "lwasm.h"
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25 #include "instab.h"
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26
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27 // for no-op pseudos
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28 PARSEFUNC(pseudo_parse_noop)
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29 {
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30 }
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31
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32 RESOLVEFUNC(pseudo_resolve_noop)
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33 {
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34 }
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35
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36 // for "end"
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37 PARSEFUNC(pseudo_parse_end)
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38 {
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39 lw_expr_t addr;
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40
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41 as -> endseen = 1;
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42
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43 if (as -> output_format != OUTPUT_DECB)
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44 {
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45 skip_operand(p);
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46 return;
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47 }
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48
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49 addr = lwasm_parse_expr(as, p);
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50 if (!addr)
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51 {
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52 lwasm_register_error(as, l, "Bad expression");
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53 addr = lw_expr_build(lw_expr_type_int, 0);
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54 }
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55 lwasm_save_expr(l, 0, addr);
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56 }
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57
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58 RESOLVEFUNC(pseudo_resolve_end)
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59 {
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60 lw_expr_t addr;
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61
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62 addr = lwasm_fetch_expr(l, 0);
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63
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64 if (addr)
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65 {
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66 if (!lw_expr_istype(addr, lw_expr_type_int))
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67 lwasm_register_error(as, l, "Exec address not constant!");
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68 else
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69 as -> execaddr = lw_expr_intval(addr);
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70 }
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71 as -> endseen = 1;
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72 }
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73
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74 PARSEFUNC(pseudo_parse_fcb)
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75 {
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76 int i = 0;
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77 lw_expr_t e;
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78
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79 for (;;)
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80 {
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81 e = lwasm_parse_expr(as, p);
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82 if (!e)
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83 {
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84 lwasm_register_error(as, l, "Bad expression (#%s)", i);
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85 break;
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86 }
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87 lwasm_save_expr(l, i, e);
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88 i++;
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89 }
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90
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91 l -> len = i;
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92 }
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93
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94 RESOLVEFUNC(pseudo_resolve_fcb)
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95 {
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96 int i;
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97 lw_expr_t e;
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98 int v;
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99
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100 for (i = 0; i < l -> len; i++)
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101 {
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102 e = lwasm_fetch_expr(l, i);
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103 lwasm_emitexpr(l, e, 1);
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104 }
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105 }
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106
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107 PARSEFUNC(pseudo_parse_fdb)
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108 {
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109 int i = 0;
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110 lw_expr_t e;
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111
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112 for (;;)
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113 {
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114 e = lwasm_parse_expr(as, p);
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115 if (!e)
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116 {
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117 lwasm_register_error(as, l, "Bad expression (#%s)", i);
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118 break;
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119 }
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120 lwasm_save_expr(l, i, e);
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121 i++;
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122 }
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123
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124 l -> len = i * 2;
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125 }
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126
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127 RESOLVEFUNC(pseudo_resolve_fdb)
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128 {
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129 int i;
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130 lw_expr_t e;
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131 int v;
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132
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133 for (i = 0; i < (l -> len)/2; i++)
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134 {
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135 e = lwasm_fetch_expr(l, i);
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136 lwasm_emitexpr(l, e, 2);
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137 }
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138 }
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139
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140 PARSEFUNC(pseudo_parse_fqb)
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141 {
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142 int i = 0;
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143 lw_expr_t e;
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144
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145 for (;;)
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146 {
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147 e = lwasm_parse_expr(as, p);
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148 if (!e)
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149 {
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150 lwasm_register_error(as, l, "Bad expression (#%s)", i);
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151 break;
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152 }
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153 lwasm_save_expr(l, i, e);
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154 i++;
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155 }
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156
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157 l -> len = i * 4;
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158 }
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159
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160 RESOLVEFUNC(pseudo_resolve_fqb)
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161 {
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162 int i;
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163 lw_expr_t e;
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164 int v;
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165
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166 for (i = 0; i < (l -> len)/4; i++)
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167 {
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168 e = lwasm_fetch_expr(l, i);
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169 lwasm_emitexpr(l, e, 4);
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170 }
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171 }
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