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annotate lwasm/insn_tfm.c @ 402:b20f14edda5a
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> |
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date | Wed, 14 Oct 2015 20:49:41 -0600 |
parents | 2abcd82b455f |
children | 01bdad2118aa |
rev | line source |
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0
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1 /* |
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2 insn_tfm.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 <ctype.h> |
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22 #include <string.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 PARSEFUNC(insn_parse_tfm) |
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28 { |
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29 static const char *reglist = "DXYUS AB 00EF"; |
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30 int r0, r1; |
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31 char *c; |
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32 int tfm = 0; |
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33 |
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34 c = strchr(reglist, toupper(*(*p)++)); |
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35 if (!c) |
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36 { |
387
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37 lwasm_register_error(as, l, E_REGISTER_BAD); |
0
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38 return; |
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39 } |
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40 r0 = c - reglist; |
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41 if (**p == '+') |
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42 { |
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43 (*p)++; |
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44 tfm = 1; |
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45 } |
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46 else if (**p == '-') |
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47 { |
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48 (*p)++; |
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49 tfm = 2; |
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50 } |
402
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51 lwasm_skip_to_next_token(l, p); |
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52 if (*(*p)++ != ',') |
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53 { |
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54 lwasm_register_error(as, l, E_UNKNOWN_OPERATION); |
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55 return; |
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56 } |
402
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57 lwasm_skip_to_next_token(l, p); |
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58 c = strchr(reglist, toupper(*(*p)++)); |
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59 if (!c) |
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60 { |
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61 lwasm_register_error(as, l, E_REGISTER_BAD); |
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62 return; |
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63 } |
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64 r1 = c - reglist; |
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65 |
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66 if (**p == '+') |
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67 { |
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68 (*p)++; |
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69 tfm |= 4; |
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70 } |
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71 else if (**p == '-') |
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72 { |
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73 (*p)++; |
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74 tfm |= 8; |
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75 } |
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76 |
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77 if (**p && !isspace(**p)) |
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78 { |
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79 lwasm_register_error(as, l, E_OPERAND_BAD); |
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80 return; |
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81 } |
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82 /* only D, X, Y, U, S are valid tfm registers */ |
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83 if (r0 > 4 || r1 > 4) |
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84 { |
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85 if (r0 < r1) r0 = r1; |
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86 lwasm_register_error2(as, l, E_REGISTER_BAD, "'%c'", reglist[r0]); |
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87 } |
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88 |
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89 // valid values of tfm here are: |
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90 // 1: r0+,r1 (2) |
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91 // 4: r0,r1+ (3) |
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92 // 5: r0+,r1+ (0) |
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93 // 10: r0-,r1- (1) |
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94 switch (tfm) |
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95 { |
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96 case 5: //r0+,r1+ |
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97 l -> lint = instab[l -> insn].ops[0]; |
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98 break; |
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99 |
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100 case 10: //r0-,r1- |
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101 l -> lint = instab[l -> insn].ops[1]; |
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102 break; |
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103 |
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104 case 1: // r0+,r1 |
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105 l -> lint = instab[l -> insn].ops[2]; |
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106 break; |
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107 |
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108 case 4: // r0,r1+ |
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109 l -> lint = instab[l -> insn].ops[3]; |
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110 break; |
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111 |
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112 default: |
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113 lwasm_register_error(as, l, E_UNKNOWN_OPERATION); |
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114 return; |
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115 } |
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116 l -> pb = (r0 << 4) | r1; |
134 | 117 l -> len = OPLEN(l -> lint) + 1; |
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118 } |
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119 |
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120 EMITFUNC(insn_emit_tfm) |
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121 { |
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122 lwasm_emitop(l, l -> lint); |
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123 lwasm_emit(l, l -> pb); |
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124 } |
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125 |
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126 PARSEFUNC(insn_parse_tfmrtor) |
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127 { |
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128 int r0, r1; |
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129 static const char *regs = "D X Y U S A B 0 0 E F "; |
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130 |
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131 // register to register (r0,r1) |
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132 // registers are in order: |
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133 // D,X,Y,U,S,PC,W,V |
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134 // A,B,CC,DP,0,0,E,F |
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135 r0 = lwasm_lookupreg2(regs, p); |
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136 lwasm_skip_to_next_token(l, p); |
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137 if (r0 < 0 || *(*p)++ != ',') |
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138 { |
370
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139 lwasm_register_error(as, l, E_OPERAND_BAD); |
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140 r0 = r1 = 0; |
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141 } |
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142 else |
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143 { |
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144 lwasm_skip_to_next_token(l, p); |
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145 r1 = lwasm_lookupreg2(regs, p); |
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146 if (r1 < 0) |
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147 { |
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148 lwasm_register_error(as, l, E_OPERAND_BAD); |
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149 r0 = r1 = 0; |
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150 } |
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151 } |
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152 l -> len = instab[l -> insn].ops[0] + 1; |
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153 l -> pb = (r0 << 4) | r1; |
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154 } |
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155 |
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156 EMITFUNC(insn_emit_tfmrtor) |
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157 { |
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158 lwasm_emitop(l, instab[l -> insn].ops[0]); |
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159 lwasm_emit(l, l -> pb); |
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160 } |