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Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
author lost@l-w.ca
date Wed, 19 Jan 2011 22:27:17 -0700
parents
children 697bc543368c
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-1:000000000000 0:2c24602be78f
1 /*
2 pass2.c
3
4 Copyright © 2010 William Astle
5
6 This file is part of LWTOOLS.
7
8 LWTOOLS is free software: you can redistribute it and/or modify it under the
9 terms of the GNU General Public License as published by the Free Software
10 Foundation, either version 3 of the License, or (at your option) any later
11 version.
12
13 This program is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 more details.
17
18 You should have received a copy of the GNU General Public License along with
19 this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include <stdio.h>
23 #include <string.h>
24
25 #include <lw_alloc.h>
26 #include <lw_string.h>
27
28 #include "lwasm.h"
29 #include "instab.h"
30
31 /*
32 pass 2: deal with undefined symbols and do a simplification pass
33 on all the expressions. Handle PRAGMA_IMPORTUNDEFEXPORT
34
35 */
36 void do_pass2(asmstate_t *as)
37 {
38 line_t *cl;
39 exportlist_t *ex;
40 struct symtabe *s;
41 importlist_t *im;
42 struct line_expr_s *le;
43
44 // verify the export list
45 if (as -> output_format == OUTPUT_OBJ)
46 {
47 for (ex = as -> exportlist; ex; ex = ex -> next)
48 {
49 s = lookup_symbol(as, NULL, ex -> symbol);
50 if (!s)
51 {
52 if (CURPRAGMA(ex -> line, PRAGMA_IMPORTUNDEFEXPORT))
53 {
54 for (im = as -> importlist; im; im = im -> next)
55 {
56 if (!strcmp(ex -> symbol, im -> symbol))
57 break;
58 }
59 if (!im)
60 {
61 im = lw_alloc(sizeof(importlist_t));
62 im -> symbol = lw_strdup(ex -> symbol);
63 im -> next = as -> importlist;
64 as -> importlist = im;
65 }
66 }
67 else
68 {
69 // undefined export - register error
70 lwasm_register_error(as, ex -> line, "Undefined exported symbol");
71 }
72 }
73 ex -> se = s;
74 }
75 if (as -> errorcount > 0)
76 return;
77 }
78
79 // we want to throw errors on undefined symbols here
80 as -> badsymerr = 1;
81
82 // now do some reductions on expressions
83 for (cl = as -> line_head; cl; cl = cl -> next)
84 {
85 as -> cl = cl;
86
87 // simplify address
88 lwasm_reduce_expr(as, cl -> addr);
89
90 // simplify each expression
91 for (le = cl -> exprs; le; le = le -> next)
92 lwasm_reduce_expr(as, le -> expr);
93 }
94 }