annotate lwasm/insn_rel.c @ 455:cad5937314cb

Add operandsizewarning pragma Add operandsizewarning pragma that will raise warnings for certain operands if the operand size could be smaller. (Long branch used instead of short branch, for instance.)
author William Astle <lost@l-w.ca>
date Fri, 16 Feb 2018 22:53:46 -0700
parents 0af33282b518
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 <ctype.h>
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26 #include <stdlib.h>
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27 #include <stdio.h>
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28 #include <string.h>
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29
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30 #include <lw_expr.h>
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31
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32 #include "lwasm.h"
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33 #include "instab.h"
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34
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35 /*
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36 For generic relative, the first "opcode" is the natural opcode for the
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37 mneumonic. The second "opcode" is the natural size of the relative offset.
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38 These will be used when pragma autobranchlength is NOT in effect.
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39
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40 The third "opcode" is the short (8 bit) version of the branch. The final one
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41 is the long (16 bit) version of the branch. These will be used when pragma
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42 autobranchlength is in effect.
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43
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44 When autobranchlength is in effect, the branch target can be prefixed with
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45 either < or > to force a short or long branch. Note that in this mode,
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46 a > or < on its own still specifies a branch point.
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47
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48 */
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49 PARSEFUNC(insn_parse_relgen)
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50 {
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51 lw_expr_t t = NULL, e1, e2;
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52
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53 l -> lint = -1;
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54 l -> maxlen = OPLEN(instab[l -> insn].ops[3]) + 2;
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55 l -> minlen = OPLEN(instab[l -> insn].ops[2]) + 1;
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56 if (CURPRAGMA(l, PRAGMA_AUTOBRANCHLENGTH) == 0)
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57 {
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58 l -> lint = instab[l -> insn].ops[1];
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59 }
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60 else
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61 {
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62 if (**p == '>' && (((*p)[1]) && !isspace((*p)[1])))
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63 {
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64 (*p)++;
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65 l -> lint = 16;
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66 }
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67 else if (**p == '<' && (((*p)[1]) && !isspace((*p)[1])))
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68 {
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69 (*p)++;
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70 l -> lint = 8;
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71 }
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72 }
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73
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74 /* forced sizes handled */
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75
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76 // sometimes there is a "#", ignore if there
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77 if (**p == '#')
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78 (*p)++;
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79
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80 if (CURPRAGMA(l, PRAGMA_QRTS))
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81 {
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82 // handle ?RTS conditional return
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83 if (**p == '?')
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84 {
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85 if (strncasecmp(*p, "?RTS", 4) == 0)
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86 {
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87 (*p) += 4;
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88
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89 line_t *cl = l;
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90 for (cl = cl->prev; cl; cl = cl->prev)
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91 {
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92 if (cl->insn == -1)
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93 continue;
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94
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95 if (l->addr->value - cl->addr->value > 128)
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96 {
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97 cl = NULL;
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98 break;
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99 }
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100
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101 if (cl->conditional_return)
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102 break;
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103
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104 if (instab[cl->insn].ops[0] == 0x39)
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105 break;
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106 }
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107
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108 if (cl)
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109 {
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110 l->lint = -1;
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111 if (cl->conditional_return)
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112 {
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113 e2 = lw_expr_build(lw_expr_type_special, lwasm_expr_lineaddr, cl);
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114 e1 = lw_expr_build(lw_expr_type_int, 2);
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115 t = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, e1, e2);
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116 }
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117 else
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118 {
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119 t = lw_expr_build(lw_expr_type_special, lwasm_expr_lineaddr, cl);
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120 }
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121 }
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122 else
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123 {
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124 l->conditional_return = 1;
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125
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126 // t = * + 1
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127
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128 e2 = lw_expr_build(lw_expr_type_special, lwasm_expr_lineaddr, l);
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129 e1 = lw_expr_build(lw_expr_type_int, 1);
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130 t = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, e1, e2);
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131
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132 lw_expr_destroy(e1);
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133 lw_expr_destroy(e2);
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134 }
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135 }
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136 }
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137 }
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138
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139 if (!t)
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140 {
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141 t = lwasm_parse_expr(as, p);
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142 }
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143
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144 if (!t)
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145 {
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146 lwasm_register_error(as, l, E_OPERAND_BAD);
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147 return;
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148 }
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149
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150 // if we know the length of the instruction, set it now
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151 if (l -> lint == 8)
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152 {
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153 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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154 if (l->conditional_return) l->len++;
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155 }
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diff changeset
156 else if (l -> lint == 16)
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diff changeset
157 {
122
2be2649841f8 Fixed embarrassing off by one in insn_rel length calculation
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diff changeset
158 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
116
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diff changeset
159 }
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diff changeset
160
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diff changeset
161 // the offset calculation here depends on the length of this line!
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162 // how to calculate requirements?
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diff changeset
163 // this is the same problem faced by ,pcr indexing
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diff changeset
164 e2 = lw_expr_build(lw_expr_type_special, lwasm_expr_linelen, l);
0
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165 e1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, t, e2);
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166 lw_expr_destroy(e2);
116
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diff changeset
167 e2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, e1, l -> addr);
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diff changeset
168 lw_expr_destroy(e1);
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diff changeset
169 lwasm_save_expr(l, 0, e2);
89
651b85a98c1b Fixed memory leaks revealed by valgrind
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diff changeset
170 lw_expr_destroy(t);
116
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diff changeset
171
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diff changeset
172 if (l -> len == -1)
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diff changeset
173 {
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diff changeset
174 e1 = lw_expr_copy(e2);
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diff changeset
175 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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diff changeset
176 lwasm_reduce_expr(as, e1);
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diff changeset
177 l -> len = -1;
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178 if (lw_expr_istype(e1, lw_expr_type_int))
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diff changeset
179 {
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diff changeset
180 int v;
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diff changeset
181 v = lw_expr_intval(e1);
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182 if (v >= -128 && v <= 127)
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diff changeset
183 {
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diff changeset
184 l -> lint = 8;
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diff changeset
185 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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diff changeset
186 }
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diff changeset
187 else
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diff changeset
188 {
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diff changeset
189 l -> lint = 16;
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190 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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diff changeset
191 }
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diff changeset
192 }
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diff changeset
193 lw_expr_destroy(e1);
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diff changeset
194 }
0
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195 }
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196
116
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diff changeset
197 RESOLVEFUNC(insn_resolve_relgen)
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198 {
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diff changeset
199 lw_expr_t e, e2;
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diff changeset
200 int offs;
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diff changeset
201
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diff changeset
202 if (l -> lint == -1)
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parents: 91
diff changeset
203 {
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diff changeset
204 e = lwasm_fetch_expr(l, 0);
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diff changeset
205 if (!lw_expr_istype(e, lw_expr_type_int))
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diff changeset
206 {
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diff changeset
207 // temporarily set the instruction length to see if we get a
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diff changeset
208 // constant for our expression; if so, we can select an instruction
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diff changeset
209 // size
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diff changeset
210 e2 = lw_expr_copy(e);
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diff changeset
211 // size of 8-bit opcode + 8 bit offset
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diff changeset
212 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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diff changeset
213 lwasm_reduce_expr(as, e2);
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diff changeset
214 l -> len = -1;
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diff changeset
215 if (lw_expr_istype(e2, lw_expr_type_int))
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diff changeset
216 {
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diff changeset
217 // it reduced to an integer; is it in 8 bit range?
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diff changeset
218 offs = lw_expr_intval(e2);
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219 if (offs >= -128 && offs <= 127)
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220 {
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diff changeset
221 // fits in 8 bits
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diff changeset
222 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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diff changeset
223 l -> lint = 8;
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diff changeset
224 }
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diff changeset
225 else
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diff changeset
226 {
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diff changeset
227 // requires 16 bits
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diff changeset
228 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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diff changeset
229 l -> lint = 16;
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diff changeset
230 }
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diff changeset
231 }
211
6f2e18f1fe67 Improve autobranchlength pragma
William Astle <lost@l-w.ca>
parents: 122
diff changeset
232 // size of 8-bit opcode + 8 bit offset
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diff changeset
233 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
6f2e18f1fe67 Improve autobranchlength pragma
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parents: 122
diff changeset
234 as -> pretendmax = 1;
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parents: 122
diff changeset
235 lwasm_reduce_expr(as, e2);
6f2e18f1fe67 Improve autobranchlength pragma
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parents: 122
diff changeset
236 as -> pretendmax = 0;
6f2e18f1fe67 Improve autobranchlength pragma
William Astle <lost@l-w.ca>
parents: 122
diff changeset
237 l -> len = -1;
6f2e18f1fe67 Improve autobranchlength pragma
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parents: 122
diff changeset
238 if (lw_expr_istype(e2, lw_expr_type_int))
6f2e18f1fe67 Improve autobranchlength pragma
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parents: 122
diff changeset
239 {
6f2e18f1fe67 Improve autobranchlength pragma
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parents: 122
diff changeset
240 // it reduced to an integer; is it in 8 bit range?
6f2e18f1fe67 Improve autobranchlength pragma
William Astle <lost@l-w.ca>
parents: 122
diff changeset
241 offs = lw_expr_intval(e2);
6f2e18f1fe67 Improve autobranchlength pragma
William Astle <lost@l-w.ca>
parents: 122
diff changeset
242 if (offs >= -128 && offs <= 127)
6f2e18f1fe67 Improve autobranchlength pragma
William Astle <lost@l-w.ca>
parents: 122
diff changeset
243 {
6f2e18f1fe67 Improve autobranchlength pragma
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parents: 122
diff changeset
244 // fits in 8 bits with a worst case scenario
6f2e18f1fe67 Improve autobranchlength pragma
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parents: 122
diff changeset
245 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
6f2e18f1fe67 Improve autobranchlength pragma
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parents: 122
diff changeset
246 l -> lint = 8;
6f2e18f1fe67 Improve autobranchlength pragma
William Astle <lost@l-w.ca>
parents: 122
diff changeset
247 }
6f2e18f1fe67 Improve autobranchlength pragma
William Astle <lost@l-w.ca>
parents: 122
diff changeset
248 }
116
7b0716264251 Pragma autobranchlength implementation completed
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diff changeset
249 lw_expr_destroy(e2);
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
250 }
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
251 if (lw_expr_istype(e, lw_expr_type_int))
7b0716264251 Pragma autobranchlength implementation completed
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diff changeset
252 {
7b0716264251 Pragma autobranchlength implementation completed
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diff changeset
253 // it reduced to an integer; is it in 8 bit range?
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diff changeset
254 offs = lw_expr_intval(e);
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parents: 91
diff changeset
255 if (offs >= -128 && offs <= 127)
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parents: 91
diff changeset
256 {
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diff changeset
257 // fits in 8 bits
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parents: 91
diff changeset
258 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
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diff changeset
259 l -> lint = 8;
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
260 }
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
261 else
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
262 {
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parents: 91
diff changeset
263 // requires 16 bits
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parents: 91
diff changeset
264 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
265 l -> lint = 16;
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
266 }
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
267 }
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
268 }
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
269 if (!force)
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diff changeset
270 return;
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parents: 91
diff changeset
271
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
272 if (l -> len == -1)
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
273 {
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
274 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
275 l -> lint = 16;
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
276 }
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
277 }
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
278
7b0716264251 Pragma autobranchlength implementation completed
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diff changeset
279 EMITFUNC(insn_emit_relgen)
0
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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diff changeset
280 {
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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parents:
diff changeset
281 lw_expr_t e;
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
282 int offs;
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
283
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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diff changeset
284 e = lwasm_fetch_expr(l, 0);
116
7b0716264251 Pragma autobranchlength implementation completed
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diff changeset
285 if (l -> lint == 8)
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
286 {
116
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
287 if (!lw_expr_istype(e, lw_expr_type_int))
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
288 {
370
8764142b3192 Convert internal error/warning handling framework to a new unified system
William Astle <lost@l-w.ca>
parents: 241
diff changeset
289 lwasm_register_error(as, l, E_EXPRESSION_NOT_CONST);
116
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
290 return;
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
291 }
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
292
116
7b0716264251 Pragma autobranchlength implementation completed
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parents: 91
diff changeset
293 offs = lw_expr_intval(e);
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lost@l-w.ca
parents: 91
diff changeset
294 if (l -> lint == 8 && (offs < -128 || offs > 127))
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
295 {
370
8764142b3192 Convert internal error/warning handling framework to a new unified system
William Astle <lost@l-w.ca>
parents: 241
diff changeset
296 lwasm_register_error(as, l, E_BYTE_OVERFLOW);
116
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
297 return;
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
298 }
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
299
377
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
300 if (l->conditional_return)
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
301 {
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
302 lwasm_emitop(l, instab[l->insn].ops[2] ^ 1); /* flip branch, add RTS */
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
303 lwasm_emit(l, 1);
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
304 lwasm_emit(l, 0x39);
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
305 l->cycle_adj = 3;
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
306 }
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
307 else
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
308 {
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
309 lwasm_emitop(l, instab[l->insn].ops[2]);
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
310 lwasm_emit(l, offs);
67373a053c49 Add ?rts target for branch instructions
William Astle <lost@l-w.ca>
parents: 376
diff changeset
311 }
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
312 }
116
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
313 else
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
314 {
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
315 lwasm_emitop(l, instab[l -> insn].ops[3]);
7b0716264251 Pragma autobranchlength implementation completed
lost@l-w.ca
parents: 91
diff changeset
316 lwasm_emitexpr(l, e, 2);
455
cad5937314cb Add operandsizewarning pragma
William Astle <lost@l-w.ca>
parents: 408
diff changeset
317 if (CURPRAGMA(l, PRAGMA_OPERANDSIZE) && lw_expr_istype(e, lw_expr_type_int))
cad5937314cb Add operandsizewarning pragma
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318 {
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319 offs = lw_expr_intval(e);
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320 if (offs >= -128 && offs <= 127)
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321 {
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322 lwasm_register_error(as, l, W_OPERAND_SIZE);
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323 }
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324 }
116
7b0716264251 Pragma autobranchlength implementation completed
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325 }
0
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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326 }