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annotate lwasm/insn_bitbit.c @ 402:b20f14edda5a

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Completed initial conversion to new parser allowing spaces in operands Converted the remaining addressing modes. This required a complete rewrite of a large portion of the indexed addressing parser. Now the entire indexed parsing system is programmatic without cheating with a lookup table. This update also fixes the "force 0,r" by writing a literal 0,r which is *supposed* to work. There will likely be some pseudo ops that need tweaking for space handling, specially those that take multiple operands of some description which are not expressions. (The expression parser call eats the spaces both before and after the expression, if appropriate.)
author William Astle <lost@l-w.ca>
date Wed, 14 Oct 2015 20:49:41 -0600
parents 8764142b3192
children
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1 /*
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2 insn_bitbit.c
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3 Copyright © 2009 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 #include <stdlib.h>
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22 #include <ctype.h>
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23
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24 #include <lw_expr.h>
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25
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26 #include "lwasm.h"
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27 #include "instab.h"
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28
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29 // these instructions cannot tolerate external references
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30 PARSEFUNC(insn_parse_bitbit)
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31 {
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32 int r;
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33 lw_expr_t e;
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34 // int v1;
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35 // int tv;
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36
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37 r = toupper(*(*p)++);
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38 if (r == 'A')
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39 r = 1;
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40 else if (r == 'B')
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41 r = 2;
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42 else if (r == 'C' && toupper(**p) == 'C')
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43 {
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44 r = 0;
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45 (*p)++;
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46 }
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47 else
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48 {
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49 lwasm_register_error(as, l, E_REGISTER_BAD);
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50 return;
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51 }
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52 lwasm_skip_to_next_token(l, p);
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53 if (*(*p)++ != ',')
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54 {
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55 lwasm_register_error(as, l, E_OPERAND_BAD);
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56 return;
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57 }
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58 e = lwasm_parse_expr(as, p);
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59 if (!e)
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60 {
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61 lwasm_register_error(as, l, E_OPERAND_BAD);
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62 return;
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63 }
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64 lwasm_save_expr(l, 0, e);
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65 if (*(*p)++ != ',')
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66 {
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67 lwasm_register_error(as, l, E_OPERAND_BAD);
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68 return;
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69 }
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70
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71 e = lwasm_parse_expr(as, p);
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72 if (!e)
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73 {
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74 lwasm_register_error(as, l, E_OPERAND_BAD);
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75 return;
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76 }
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77 lwasm_save_expr(l, 1, e);
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78
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79 if (*(*p)++ != ',')
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80 {
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81 lwasm_register_error(as, l, E_OPERAND_BAD);
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82 return;
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83 }
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84 lwasm_skip_to_next_token(l, p);
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85 // ignore base page address modifier
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86 if (**p == '<')
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87 (*p)++;
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88
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89 e = lwasm_parse_expr(as, p);
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90 if (!e)
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91 {
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92 lwasm_register_error(as, l, E_OPERAND_BAD);
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93 return;
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94 }
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95 lwasm_save_expr(l, 2, e);
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96
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97 l -> lint = r;
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98 l -> len = OPLEN(instab[l -> insn].ops[0]) + 2;
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99 }
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100
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101 EMITFUNC(insn_emit_bitbit)
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102 {
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103 int v1, v2;
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104 lw_expr_t e;
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105
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106 e = lwasm_fetch_expr(l, 0);
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107 if (!lw_expr_istype(e, lw_expr_type_int))
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108 {
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109 lwasm_register_error(as, l, E_BITNUMBER_UNRESOLVED);
0
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110 return;
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111 }
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112 v1 = lw_expr_intval(e);
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113 if (v1 < 0 || v1 > 7)
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114 {
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115 lwasm_register_error(as, l, E_BITNUMBER_INVALID);
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116 v1 = 0;
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117 }
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118
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119 e = lwasm_fetch_expr(l, 1);
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120 if (!lw_expr_istype(e, lw_expr_type_int))
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121 {
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122 lwasm_register_error(as, l, E_BITNUMBER_UNRESOLVED);
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123 return;
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124 }
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125 v2 = lw_expr_intval(e);
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126 if (v2 < 0 || v2 > 7)
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127 {
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128 lwasm_register_error(as, l, E_BITNUMBER_INVALID);
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129 v2 = 0;
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130 }
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131 l -> pb = (l -> lint << 6) | (v1 << 3) | v2;
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132
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133 e = lwasm_fetch_expr(l, 2);
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134 if (lw_expr_istype(e, lw_expr_type_int))
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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135 {
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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136 v1 = lw_expr_intval(e) & 0xFFFF;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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137 v2 = v1 - ((l -> dpval) << 8);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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138 if (v2 > 0xFF || v2 < 0)
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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139 {
370
8764142b3192 Convert internal error/warning handling framework to a new unified system
William Astle <lost@l-w.ca>
parents: 2
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140 lwasm_register_error(as, l, E_BYTE_OVERFLOW);
0
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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141 return;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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142 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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143 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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144 lwasm_emitop(l, instab[l -> insn].ops[0]);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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145 lwasm_emit(l, l -> pb);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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146 lwasm_emitexpr(l, e, 1);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
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147 }