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annotate lwasm/insn_bitbit.c @ 502:14a40f8bb4eb

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Add various operators to lwcc Add various binary and ternary operators to lwcc, but only those which can work with constant operands. Seems like variables are probably required next.
author William Astle <lost@l-w.ca>
date Wed, 25 Sep 2019 20:23:49 -0600
parents b20f14edda5a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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))
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135 {
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lost@l-w.ca
parents:
diff changeset
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
lost@l-w.ca
parents:
diff changeset
137 v2 = v1 - ((l -> dpval) << 8);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
parents:
diff changeset
138 if (v2 > 0xFF || v2 < 0)
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
parents:
diff changeset
139 {
370
8764142b3192 Convert internal error/warning handling framework to a new unified system
William Astle <lost@l-w.ca>
parents: 2
diff changeset
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
parents:
diff changeset
141 return;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
parents:
diff changeset
142 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
parents:
diff changeset
143 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
lost@l-w.ca
parents:
diff changeset
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
parents:
diff changeset
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
parents:
diff changeset
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
parents:
diff changeset
147 }