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annotate lwasm/pass3.c @ 186:1824cabf25ce

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Various enhancements to lwasm
author lost@l-w.ca
date Thu, 22 Dec 2011 18:04:13 -0700
parents 697bc543368c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 /*
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2 pass3.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 Resolve1 Pass
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33
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34 repeatedly resolve instruction sizes and line addresses
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35 until nothing more reduces
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36
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37 */
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38 void do_pass3(asmstate_t *as)
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39 {
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40 int rc;
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41 line_t *cl;
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42 struct line_expr_s *le;
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43
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44 do
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45 {
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46 rc = 0;
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47 for (cl = as -> line_head; cl; cl = cl -> next)
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48 {
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49 as -> cl = cl;
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50
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51 // simplify address
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52 lwasm_reduce_expr(as, cl -> addr);
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53
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54 // simplify data address
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55 lwasm_reduce_expr(as, cl -> daddr);
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56
0
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57 // simplify each expression
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58 for (le = cl -> exprs; le; le = le -> next)
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59 lwasm_reduce_expr(as, le -> expr);
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60
142
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61 if (cl -> len == -1 || cl -> dlen == -1)
0
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62 {
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63 // try resolving the instruction length
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64 // but don't force resolution
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65 if (cl -> insn >= 0 && instab[cl -> insn].resolve)
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66 {
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67 (instab[cl -> insn].resolve)(as, cl, 0);
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68 debug_message(as, 100, "len = %d, dlen = %d", cl -> len, cl -> dlen);
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69 if ((cl -> inmod == 0) && cl -> len >= 0 && cl -> dlen >= 0)
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70 {
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71 if (cl -> len == 0)
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72 cl -> len = cl -> dlen;
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73 else
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74 cl -> dlen = cl -> len;
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75 }
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76 if (cl -> len != -1 && cl -> dlen != -1)
0
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77 rc++;
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78 }
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79 }
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80 }
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81 if (as -> errorcount > 0)
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82 return;
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83 } while (rc > 0);
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84 }