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annotate lwasm/pass2.c @ 455:cad5937314cb

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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 8764142b3192
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 <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 pass 2: deal with undefined symbols and do a simplification pass
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33 on all the expressions. Handle PRAGMA_IMPORTUNDEFEXPORT
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34
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35 */
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36 void do_pass2(asmstate_t *as)
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37 {
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38 line_t *cl;
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39 exportlist_t *ex;
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40 struct symtabe *s;
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41 importlist_t *im;
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42 struct line_expr_s *le;
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43
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44 // verify the export list
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45 if (as -> output_format == OUTPUT_OBJ)
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46 {
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47 for (ex = as -> exportlist; ex; ex = ex -> next)
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48 {
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49 s = lookup_symbol(as, NULL, ex -> symbol);
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50 if (!s)
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51 {
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52 if (CURPRAGMA(ex -> line, PRAGMA_IMPORTUNDEFEXPORT))
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53 {
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54 for (im = as -> importlist; im; im = im -> next)
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55 {
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56 if (!strcmp(ex -> symbol, im -> symbol))
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57 break;
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58 }
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59 if (!im)
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60 {
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61 im = lw_alloc(sizeof(importlist_t));
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62 im -> symbol = lw_strdup(ex -> symbol);
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63 im -> next = as -> importlist;
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64 as -> importlist = im;
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65 }
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66 }
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67 else
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68 {
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69 // undefined export - register error
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70 lwasm_register_error(as, ex->line, E_SYMBOL_UNDEFINED_EXPORT);
0
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71 }
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72 }
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73 ex -> se = s;
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74 }
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75 if (as -> errorcount > 0)
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76 return;
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77 }
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78
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79 // we want to throw errors on undefined symbols here
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80 as -> badsymerr = 1;
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81
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82 // now do some reductions on expressions
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83 for (cl = as -> line_head; cl; cl = cl -> next)
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84 {
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85 as -> cl = cl;
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86
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87 // simplify address
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88 lwasm_reduce_expr(as, cl -> addr);
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89
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90 // simplify data address
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91 lwasm_reduce_expr(as, cl -> daddr);
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92
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93 // simplify each expression
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94 for (le = cl -> exprs; le; le = le -> next)
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95 lwasm_reduce_expr(as, le -> expr);
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96 }
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97 }