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annotate lwasm/pass2.c @ 426:652eee8f0c82

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Fixed lw_expr_destroy() to not crash on NULL
author lost@l-w.ca
date Sun, 19 Sep 2010 10:40:37 -0600
parents d99322ef6f21
children
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363
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1 /*
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2 pass2.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 <config.h>
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23
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24 #include <stdio.h>
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25 #include <string.h>
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26
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27 #include <lw_alloc.h>
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28 #include <lw_string.h>
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29
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30 #include "lwasm.h"
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31 #include "instab.h"
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32
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33 /*
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34 pass 2: deal with undefined symbols and do a simplification pass
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35 on all the expressions. Handle PRAGMA_IMPORTUNDEFEXPORT
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36
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37 */
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38 void do_pass2(asmstate_t *as)
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39 {
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40 line_t *cl;
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41 exportlist_t *ex;
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42 struct symtabe *s;
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43 importlist_t *im;
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44 struct line_expr_s *le;
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45
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46 // verify the export list
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47 if (as -> output_format == OUTPUT_OBJ)
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48 {
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49 for (ex = as -> exportlist; ex; ex = ex -> next)
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50 {
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51 s = lookup_symbol(as, NULL, ex -> symbol);
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52 if (!s)
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53 {
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54 if (CURPRAGMA(ex -> line, PRAGMA_IMPORTUNDEFEXPORT))
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55 {
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56 for (im = as -> importlist; im; im = im -> next)
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57 {
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58 if (!strcmp(ex -> symbol, im -> symbol))
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59 break;
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60 }
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61 if (!im)
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62 {
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63 im = lw_alloc(sizeof(importlist_t));
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64 im -> symbol = lw_strdup(ex -> symbol);
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65 im -> next = as -> importlist;
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66 as -> importlist = im;
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67 }
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68 }
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69 else
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70 {
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71 // undefined export - register error
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72 lwasm_register_error(as, ex -> line, "Undefined exported symbol");
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73 }
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74 }
374
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75 ex -> se = s;
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76 }
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77 if (as -> errorcount > 0)
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78 return;
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79 }
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80
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81 // we want to throw errors on undefined symbols here
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82 as -> badsymerr = 1;
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83
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84 // now do some reductions on expressions
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85 for (cl = as -> line_head; cl; cl = cl -> next)
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86 {
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87 as -> cl = cl;
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88
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89 // simplify address
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90 lwasm_reduce_expr(as, cl -> addr);
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91
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92 // simplify each expression
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93 for (le = cl -> exprs; le; le = le -> next)
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94 lwasm_reduce_expr(as, le -> expr);
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95 }
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96 }