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annotate lwasm/insn_rel.c @ 36:5325b640424d

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First pass expression parsing
author Lost Wizard (lost@starbug3)
date Tue, 08 Feb 2011 22:42:12 -0700
parents 7317fbe024af
children 651b85a98c1b
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0
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1 /*
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2 insn_rel.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 /*
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22 for handling relative mode instructions
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23 */
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24
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25 #include <stdlib.h>
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26
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27 #include <lw_expr.h>
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28
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29 #include "lwasm.h"
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30 #include "instab.h"
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31
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32 PARSEFUNC(insn_parse_rel8)
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33 {
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34 // int v;
0
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35 lw_expr_t t, e1, e2;
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36 // int r;
0
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37
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38 // sometimes there is a "#", ignore if there
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39 if (**p == '#')
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40 (*p)++;
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41
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42 t = lwasm_parse_expr(as, p);
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43 if (!t)
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44 {
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45 lwasm_register_error(as, l, "Bad operand");
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46 return;
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47 }
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48 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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49
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50 e1 = lw_expr_build(lw_expr_type_special, lwasm_expr_linelen, l);
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51 e2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, e1, l -> addr);
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52 lw_expr_destroy(e1);
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53 e1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, t, e2);
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54 lw_expr_destroy(e2);
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55 lwasm_save_expr(l, 0, e1);
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56 }
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57
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58 EMITFUNC(insn_emit_rel8)
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59 {
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60 lw_expr_t e;
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61 int offs;
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62
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63 e = lwasm_fetch_expr(l, 0);
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64 if (!lw_expr_istype(e, lw_expr_type_int))
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65 {
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66 lwasm_register_error(as, l, "Illegal non-constant expression");
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67 return;
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68 }
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69
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70 offs = lw_expr_intval(e);
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71 if (offs < -128 || offs > 127)
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72 {
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73 lwasm_register_error(as, l, "Byte overflow");
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74 return;
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75 }
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76
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77 lwasm_emitop(l, instab[l -> insn].ops[0]);
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78 lwasm_emit(l, offs);
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79 }
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80
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81 PARSEFUNC(insn_parse_rel16)
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82 {
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83 // int v;
0
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84 lw_expr_t t, e1, e2;
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85 // int r;
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86
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87 // sometimes there is a "#", ignore if there
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88 if (**p == '#')
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89 (*p)++;
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90
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91 t = lwasm_parse_expr(as, p);
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92 if (!t)
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93 {
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94 lwasm_register_error(as, l, "Bad operand");
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95 return;
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96 }
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97 l -> len = OPLEN(instab[l -> insn].ops[0]) + 2;
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98
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99 e1 = lw_expr_build(lw_expr_type_special, lwasm_expr_linelen, l);
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100 e2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, e1, l -> addr);
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101 lw_expr_destroy(e1);
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102 e1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, t, e2);
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103 lw_expr_destroy(e2);
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104 lwasm_save_expr(l, 0, e1);
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105 }
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106
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107 EMITFUNC(insn_emit_rel16)
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108 {
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109 lw_expr_t e;
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110 // int offs;
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111
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112 e = lwasm_fetch_expr(l, 0);
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113
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114 lwasm_emitop(l, instab[l -> insn].ops[0]);
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115 lwasm_emitexpr(l, e, 2);
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116 }