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annotate lwasm/pass6.c @ 235:e3741cf53e00
Fix error messages related to undefined symbols in lwlink
Make lwlink not complain about seciton base and length symbols. Also silence
duplicate complaints about undefined symbols. There is no need to complain
about undefined symbols during the file/section resolution stage! If they
are truly undefined, they'll still be undefined at the reference resolution
stage.
author | William Astle <lost@l-w.ca> |
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date | Sat, 11 Aug 2012 15:18:58 -0600 |
parents | 02804b7c051c |
children | 8764142b3192 |
rev | line source |
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0
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1 /* |
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2 pass6.c |
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3 |
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4 Copyright © 2010 William Astle |
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5 |
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6 This file is part of LWTOOLS. |
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7 |
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8 LWTOOLS is free software: you can redistribute it and/or modify it under the |
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9 terms of the GNU General Public License as published by the Free Software |
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10 Foundation, either version 3 of the License, or (at your option) any later |
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11 version. |
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12 |
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13 This program is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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16 more details. |
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17 |
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18 You should have received a copy of the GNU General Public License along with |
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19 this program. If not, see <http://www.gnu.org/licenses/>. |
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20 */ |
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21 |
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22 #include <stdio.h> |
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23 #include <string.h> |
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24 |
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25 #include <lw_alloc.h> |
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26 #include <lw_string.h> |
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27 |
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28 #include "lwasm.h" |
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29 #include "instab.h" |
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30 |
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31 /* |
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32 Finalize Pass |
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33 |
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34 Reduce all expressions in a final pass. |
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35 |
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36 Observation: |
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37 |
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38 Everything should reduce as far as it is going to in a single pass |
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39 because all line addresses are now constant (or section-base offset) |
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40 */ |
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41 |
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42 static int exprok_aux(lw_expr_t e, void *priv) |
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43 { |
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44 asmstate_t *as = priv; |
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45 |
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46 if (lw_expr_istype(e, lw_expr_type_int)) |
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47 return 0; |
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48 |
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49 if (as -> output_format == OUTPUT_OBJ) |
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50 { |
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51 if (lw_expr_istype(e, lw_expr_type_oper)) |
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52 return 0; |
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53 if (lw_expr_istype(e, lw_expr_type_special) && as -> output_format == OUTPUT_OBJ) |
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54 { |
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55 int t; |
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56 t = lw_expr_specint(e); |
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57 if (t == lwasm_expr_secbase || t == lwasm_expr_syment || t == lwasm_expr_import) |
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58 return 0; |
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59 } |
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60 } |
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61 |
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62 return 1; |
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63 } |
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64 |
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65 static int exprok(asmstate_t *as, lw_expr_t e) |
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66 { |
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67 if (lw_expr_testterms(e, exprok_aux, as)) |
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68 return 0; |
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69 return 1; |
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70 } |
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71 |
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72 |
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73 void do_pass6(asmstate_t *as) |
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74 { |
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75 line_t *cl; |
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76 struct line_expr_s *le; |
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77 |
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78 for (cl = as -> line_head; cl; cl = cl -> next) |
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79 { |
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80 as -> cl = cl; |
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81 for (le = cl -> exprs; le; le = le -> next) |
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82 { |
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83 lwasm_reduce_expr(as, le -> expr); |
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84 if (!exprok(as, le -> expr)) |
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85 { |
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86 lwasm_register_error(as, cl, "Invalid expression: %s", lw_expr_print(le -> expr)); |
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87 } |
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88 } |
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89 } |
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90 } |