annotate src/insn_gen.c @ 76:2fe5fd7d65a3

Checkpointing object target implementation
author lost
date Thu, 08 Jan 2009 02:57:24 +0000
parents 31d8e85706e7
children a338d496350e
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1 /*
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2 insn_gen.c, Copyright © 2009 William Astle
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3
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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 int isdp = 0;
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42
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43 optr2 = *optr;
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44 while (*optr2 && !isspace(*optr2) && *optr2 != ',') optr2++
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45 /* do nothing */ ;
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46
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47 if (*optr2 != ',' && **optr != '[')
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48 {
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49 // not indexed
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50 if (l -> fsize == 1)
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51 f8 = 1;
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52 else if (l -> fsize == 2)
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53 f16 = 1;
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54
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55 if (**optr == '<')
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56 {
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57 (*optr)++;
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58 f8 = 1;
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59 }
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60 else if (**optr == '>')
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61 {
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62 (*optr)++;
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63 f16 = 1;
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64 }
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65 s = lwasm_evaluate_expr(as, l, *optr, NULL);
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66 if (!s)
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67 {
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68 register_error(as, l, 1, "Bad expression");
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69 return;
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70 }
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71 if (!lwasm_expr_is_constant(s) && as -> passnum == 1)
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72 {
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73 f16 = 1;
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74 l -> fsize = 2;
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75 register_error(as, l, 2, "Incomplete reference");
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76 }
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77 v1 = lwasm_expr_get_value(s);
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78 lwasm_expr_stack_free(s);
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79
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80 if (((v1 >> 8) & 0xff) == (as -> dpval & 0xff))
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81 isdp = 1;
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82
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83 if (f8 || (!f16 && isdp))
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84 {
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85 v1 = v1 & 0xffff;
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86 tv = v1 - ((as -> dpval) << 8);
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87 if (tv < 0 || tv > 0xff)
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88 {
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89 register_error(as, l, 2, "Byte overflow");
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90 }
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91 v1 = v1 & 0xff;
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92 lwasm_emitop(as, l, instab[opnum].ops[0]);
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93 if (extra != -1)
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94 lwasm_emit(as, l, extra);
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95 lwasm_emit(as, l, v1 & 0xff);
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96 return;
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97 }
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98 else
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99 {
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100 // everything else is 16 bit....
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101 lwasm_emitop(as, l, instab[opnum].ops[2]);
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102 if (extra != -1)
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103 lwasm_emit(as, l, extra);
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104 lwasm_emit(as, l, v1 >> 8);
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105 lwasm_emit(as, l, v1 & 0xff);
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106 return;
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107 }
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108 }
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109
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110 lwasm_emitop(as, l, instab[opnum].ops[1]);
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111 if (extra != -1)
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112 lwasm_emit(as, l, extra);
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113 insn_indexed_aux(as, l, (const char **)optr, &b1, &b2, &b3);
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114 if (b1 != -1)
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115 lwasm_emit(as, l, b1);
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116 if (b2 != -1)
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117 lwasm_emit(as, l, b2);
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118 if (b3 != -1)
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119 lwasm_emit(as, l, b3);
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120 return;
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121 }
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122
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123 // the various insn_gen? functions have an immediate mode of ? bits
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124 OPFUNC(insn_gen0)
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125 {
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126 if (**p == '#')
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127 {
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128 register_error(as, l, 1, "Immediate mode not allowed");
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129 return;
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130 }
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131
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132 // handle non-immediate
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133 insn_gen_aux(as, l, p, opnum, -1);
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134 }
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135
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136 OPFUNC(insn_gen8)
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137 {
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138 int rval;
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139
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140 if (**p == '#')
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141 {
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142 lwasm_emitop(as, l, instab[opnum].ops[3]);
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143 (*p)++;
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144 if (lwasm_expr_result(as, l, p, EXPR_PASS2CONST | EXPR_BYTE, &rval) < 0)
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145 rval = 0;
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146 lwasm_emit(as, l, rval & 0xff);
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147 return;
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148 }
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149
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150 insn_gen_aux(as, l, p, opnum, -1);
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151 }
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152
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153 OPFUNC(insn_gen16)
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154 {
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155 lwasm_expr_stack_t *s;
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156 int rval;
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157
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158 if (**p == '#')
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159 {
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160 lwasm_emitop(as, l, instab[opnum].ops[3]);
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161 (*p)++;
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162 s = lwasm_evaluate_expr(as, l, *p, NULL);
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163 if (!s)
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164 {
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165 register_error(as, l, 1, "Bad expression");
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166 rval = 0;
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167 }
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168 else
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169 {
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170 if (!lwasm_expr_is_constant(s))
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
171 register_error(as, l, 2, "Incomplete reference");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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172 rval = lwasm_expr_get_value(s);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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173 lwasm_expr_stack_free(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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parents: 4
diff changeset
175 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
176 lwasm_emit(as, l, rval & 0xff);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
177 return;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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178 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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179
34
b29eec6f3819 Finished adding addressing mode handlers
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parents: 33
diff changeset
180 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
181 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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diff changeset
182
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
183 OPFUNC(insn_gen32)
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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185 lwasm_expr_stack_t *s;
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diff changeset
186 int rval;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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187
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
188 if (**p == '#')
0
57495da01900 Initial checking of LWASM
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189 {
33
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
190 lwasm_emitop(as, l, instab[opnum].ops[3]);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
191 (*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
192 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
193 if (!s)
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
194 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
195 register_error(as, l, 1, "Bad expression");
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diff changeset
196 rval = 0;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
197 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
198 else
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
199 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
200 if (!lwasm_expr_is_constant(s))
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
201 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
202 rval = lwasm_expr_get_value(s);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
203 lwasm_expr_stack_free(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 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
206 lwasm_emit(as, l, (rval >> 16) & 0xff);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
207 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
208 lwasm_emit(as, l, rval & 0xff);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
209 return;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
210 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
211
34
b29eec6f3819 Finished adding addressing mode handlers
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parents: 33
diff changeset
212 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
213 }
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 OPFUNC(insn_imm8)
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
216 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
217 lwasm_expr_stack_t *s;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
218 int rval;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
219
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
220 if (**p == '#')
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
221 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
222 lwasm_emitop(as, l, instab[opnum].ops[0]);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
223 (*p)++;
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 34
diff changeset
224 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
225 if (!s)
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 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
228 rval = 0;
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
229 }
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
230 else
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
231 {
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
232 if (!lwasm_expr_is_constant(s))
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
233 register_error(as, l, 2, "Incomplete reference");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
234 rval = lwasm_expr_get_value(s);
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
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parents: 4
diff changeset
235 lwasm_expr_stack_free(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)
lost
parents: 4
diff changeset
237 if (rval < -128 || rval > 255)
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
238 register_error(as, l, 2, "Byte overflow");
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
239 lwasm_emit(as, l, rval & 0xff);
0
57495da01900 Initial checking of LWASM
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parents:
diff changeset
240 return;
57495da01900 Initial checking of LWASM
lost
parents:
diff changeset
241 }
57495da01900 Initial checking of LWASM
lost
parents:
diff changeset
242
33
74a3fef7c8d0 Added general addressing modes (immediate, base page, extended, indexed)
lost
parents: 4
diff changeset
243 register_error(as, l, 1, "Bad operand");
0
57495da01900 Initial checking of LWASM
lost
parents:
diff changeset
244 }