annotate src/insn_gen.c @ 37:538e15927776

Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
author lost
date Sat, 03 Jan 2009 04:20:49 +0000
parents b29eec6f3819
children da1337724ecd
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1 /*
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2 insn_gen.c, Copyright © 2009 William Astle
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4 This file is part of LWASM.
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5
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6 LWASM is free software: you can redistribute it and/or modify it under the
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7 terms of the GNU General Public License as published by the Free Software
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8 Foundation, either version 3 of the License, or (at your option) any later
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9 version.
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10
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11 This program is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 You should have received a copy of the GNU General Public License along with
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17 this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 Contains code for parsing general addressing modes (IMM+DIR+EXT+IND)
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20 */
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21
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22 #include <ctype.h>
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23 #include <stdlib.h>
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24
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25 #include "lwasm.h"
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26 #include "instab.h"
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27 #include "expr.h"
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28
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29 extern void insn_indexed_aux(asmstate_t *as, lwasm_line_t *l, const char **p, int *b1, int *b2, int *b3);
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30
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31 // "extra" is required due to the way OIM, EIM, TIM, and AIM work
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32 void insn_gen_aux(asmstate_t *as, lwasm_line_t *l, char **optr, int opnum, int extra)
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33 {
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34 int b1 = -1, b2 = -1, b3 = -1;
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35
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36 const char *optr2;
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37 int v1, tv, rval;
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38 lwasm_expr_stack_t *s;
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39 int f8 = 0;
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40 int f16 = 0;
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41
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42 optr2 = *optr;
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43 while (*optr2 && !isspace(*optr2) && *optr2 != ',') optr2++
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44 /* do nothing */ ;
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45
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46 if (*optr2 != ',' && **optr != '[')
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47 {
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48 // not indexed
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49 if (l -> fsize == 1)
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50 f8 = 1;
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51 else if (l -> fsize == 2)
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52 f16 = 1;
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53
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54 if (**optr == '<')
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55 {
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56 (*optr)++;
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57 f8 = 1;
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58 }
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59 else if (**optr == '>')
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60 {
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61 (*optr)++;
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62 f16 = 1;
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63 }
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64 s = lwasm_evaluate_expr(as, l, *optr, NULL);
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65 if (!s)
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66 {
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67 register_error(as, l, 1, "Bad expression");
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68 return;
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69 }
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70 if (!lwasm_expr_is_constant(s))
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71 {
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72 f16 = 1;
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73 l -> fsize = 2;
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74 register_error(as, l, 2, "Incomplete reference");
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75 }
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76 v1 = lwasm_expr_get_value(s);
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77 lwasm_expr_stack_free(s);
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78
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79 if (f8 || (!f16 && v1 >= -128 && v1 <= 255))
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80 {
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81 v1 = v1 & 0xffff;
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82 tv = v1 - ((as -> dpval) << 8);
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83 if (tv < 0 || tv > 0xff)
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84 {
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85 register_error(as, l, 2, "Byte overflow");
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86 }
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87 v1 = v1 & 0xff;
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88 lwasm_emitop(as, l, instab[opnum].ops[0]);
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89 if (extra != -1)
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90 lwasm_emit(as, l, extra);
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91 lwasm_emit(as, l, v1 & 0xff);
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92 return;
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93 }
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94 else
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95 {
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96 // everything else is 16 bit....
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97 lwasm_emitop(as, l, instab[opnum].ops[2]);
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98 if (extra != -1)
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99 lwasm_emit(as, l, extra);
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100 lwasm_emit(as, l, v1 >> 8);
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101 lwasm_emit(as, l, v1 & 0xff);
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102 return;
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103 }
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104 }
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105
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106 lwasm_emitop(as, l, instab[opnum].ops[1]);
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107 if (extra != -1)
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108 lwasm_emit(as, l, extra);
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109 insn_indexed_aux(as, l, (const char **)optr, &b1, &b2, &b3);
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110 if (b1 != -1)
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111 lwasm_emit(as, l, b1);
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112 if (b2 != -1)
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113 lwasm_emit(as, l, b2);
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114 if (b3 != -1)
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115 lwasm_emit(as, l, b3);
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116 return;
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117 }
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118
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119 // the various insn_gen? functions have an immediate mode of ? bits
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120 OPFUNC(insn_gen0)
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121 {
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122 if (**p == '#')
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123 {
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124 register_error(as, l, 1, "Immediate mode not allowed");
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125 return;
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126 }
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127
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128 // handle non-immediate
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129 insn_gen_aux(as, l, p, opnum, -1);
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130 }
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131
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132 OPFUNC(insn_gen8)
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133 {
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134 lwasm_expr_stack_t *s;
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135 int rval;
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136
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137 if (**p == '#')
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138 {
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139 lwasm_emitop(as, l, instab[opnum].ops[3]);
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140 (*p)++;
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141 s = lwasm_evaluate_expr(as, l, *p, NULL);
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142 if (!s)
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143 {
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144 register_error(as, l, 1, "Bad expression");
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145 rval = 0;
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146 }
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147 else
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148 {
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149 if (!lwasm_expr_is_constant(s))
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150 register_error(as, l, 2, "Incomplete reference");
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151 rval = lwasm_expr_get_value(s);
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152 lwasm_expr_stack_free(s);
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153 }
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154 if (rval < -128 || rval > 255)
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155 register_error(as, l, 2, "Byte overflow");
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156 lwasm_emit(as, l, rval & 0xff);
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157 return;
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158 }
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159
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160 insn_gen_aux(as, l, p, opnum, -1);
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161 }
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162
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163 OPFUNC(insn_gen16)
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164 {
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165 lwasm_expr_stack_t *s;
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166 int rval;
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167
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168 if (**p == '#')
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169 {
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170 lwasm_emitop(as, l, instab[opnum].ops[3]);
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171 (*p)++;
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538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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parents: 34
diff changeset
172 s = lwasm_evaluate_expr(as, l, *p, NULL);
33
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
173 if (!s)
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
174 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
175 register_error(as, l, 1, "Bad expression");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
176 rval = 0;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
177 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
178 else
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
179 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
180 if (!lwasm_expr_is_constant(s))
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
181 register_error(as, l, 2, "Incomplete reference");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
182 rval = lwasm_expr_get_value(s);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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183 lwasm_expr_stack_free(s);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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184 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
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185 lwasm_emit(as, l, (rval >> 8) & 0xff);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
186 lwasm_emit(as, l, rval & 0xff);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
187 return;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
188 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
189
34
b29eec6f3819 Finished adding addressing mode handlers
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diff changeset
190 insn_gen_aux(as, l, p, opnum, -1);
33
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
191 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
192
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
193 OPFUNC(insn_gen32)
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
194 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
195 lwasm_expr_stack_t *s;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
196 int rval;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
197
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
198 if (**p == '#')
0
57495da01900 Initial checking of LWASM
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199 {
33
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
200 lwasm_emitop(as, l, instab[opnum].ops[3]);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
201 (*p)++;
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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parents: 34
diff changeset
202 s = lwasm_evaluate_expr(as, l, *p, NULL);
33
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
203 if (!s)
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
204 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
205 register_error(as, l, 1, "Bad expression");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
206 rval = 0;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
207 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
208 else
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
209 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
210 if (!lwasm_expr_is_constant(s))
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
211 register_error(as, l, 2, "Incomplete reference");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
212 rval = lwasm_expr_get_value(s);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
213 lwasm_expr_stack_free(s);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
214 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
215 lwasm_emit(as, l, (rval >> 24) & 0xff);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
216 lwasm_emit(as, l, (rval >> 16) & 0xff);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
217 lwasm_emit(as, l, (rval >> 8) & 0xff);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
218 lwasm_emit(as, l, rval & 0xff);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
219 return;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
220 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
221
34
b29eec6f3819 Finished adding addressing mode handlers
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parents: 33
diff changeset
222 insn_gen_aux(as, l, p, opnum, -1);
33
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
223 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
224
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
225 OPFUNC(insn_imm8)
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
226 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
227 lwasm_expr_stack_t *s;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
228 int rval;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
229
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
230 if (**p == '#')
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
231 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
232 lwasm_emitop(as, l, instab[opnum].ops[0]);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
233 (*p)++;
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 34
diff changeset
234 s = lwasm_evaluate_expr(as, l, *p, NULL);
33
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
235 if (!s)
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
236 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
237 register_error(as, l, 1, "Bad expression");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
238 rval = 0;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
239 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
240 else
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
241 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
242 if (!lwasm_expr_is_constant(s))
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
243 register_error(as, l, 2, "Incomplete reference");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
244 rval = lwasm_expr_get_value(s);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
245 lwasm_expr_stack_free(s);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
246 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
247 if (rval < -128 || rval > 255)
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
248 register_error(as, l, 2, "Byte overflow");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
249 lwasm_emit(as, l, rval & 0xff);
0
57495da01900 Initial checking of LWASM
lost
parents:
diff changeset
250 return;
57495da01900 Initial checking of LWASM
lost
parents:
diff changeset
251 }
57495da01900 Initial checking of LWASM
lost
parents:
diff changeset
252
33
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
253 register_error(as, l, 1, "Bad operand");
0
57495da01900 Initial checking of LWASM
lost
parents:
diff changeset
254 }