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annotate lwasm/pass4.c @ 416:1d69ed28f175
Fixed offset problem with emission of incomplete references at start of insn
| author | lost@l-w.ca |
|---|---|
| date | Tue, 10 Aug 2010 22:00:21 -0600 |
| parents | a741d2e4869f |
| children |
| rev | line source |
|---|---|
| 365 | 1 /* |
| 2 pass4.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 <config.h> | |
| 23 | |
| 24 #include <stdio.h> | |
| 25 #include <string.h> | |
| 26 | |
| 27 #include <lw_alloc.h> | |
| 28 #include <lw_string.h> | |
| 29 | |
| 30 #include "lwasm.h" | |
| 31 #include "instab.h" | |
| 32 | |
| 33 /* | |
| 34 Resolve2 Pass | |
| 35 | |
| 36 Force resolution of instruction sizes. | |
| 37 | |
| 38 */ | |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
371
diff
changeset
|
39 void do_pass4_aux(asmstate_t *as, int force) |
| 365 | 40 { |
| 41 int rc; | |
| 42 int cnt; | |
| 43 line_t *cl, *sl; | |
| 44 struct line_expr_s *le; | |
| 45 | |
| 46 // first, count the number of unresolved instructions | |
| 47 for (cnt = 0, cl = as -> line_head; cl; cl = cl -> next) | |
| 48 { | |
| 49 if (cl -> len == -1) | |
| 50 cnt++; | |
| 51 } | |
| 52 | |
| 53 sl = as -> line_head; | |
| 54 while (cnt > 0) | |
| 55 { | |
| 56 // find an unresolved instruction | |
| 57 for ( ; sl && sl -> len != -1; sl = sl -> next) | |
| 366 | 58 { |
| 59 as -> cl = sl; | |
| 60 lwasm_reduce_expr(as, sl -> addr); | |
| 365 | 61 |
| 366 | 62 // simplify each expression |
| 63 for (le = sl -> exprs; le; le = le -> next) | |
| 64 lwasm_reduce_expr(as, le -> expr); | |
| 65 } | |
| 66 | |
| 365 | 67 // simplify address |
| 68 as -> cl = sl; | |
| 69 lwasm_reduce_expr(as, sl -> addr); | |
| 70 | |
| 71 // simplify each expression | |
| 72 for (le = sl -> exprs; le; le = le -> next) | |
| 73 lwasm_reduce_expr(as, le -> expr); | |
| 74 | |
| 75 | |
| 371 | 76 if (sl -> len == -1 && sl -> insn >= 0 && instab[sl -> insn].resolve) |
| 365 | 77 { |
| 371 | 78 (instab[sl -> insn].resolve)(as, sl, 1); |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
371
diff
changeset
|
79 if (force && sl -> len == -1) |
| 365 | 80 { |
| 81 lwasm_register_error(as, sl, "Instruction failed to resolve."); | |
| 82 return; | |
| 83 } | |
| 84 } | |
| 85 cnt--; | |
| 86 if (cnt == 0) | |
| 87 return; | |
| 88 | |
| 89 do | |
| 90 { | |
| 91 rc = 0; | |
| 92 for (cl = sl; cl; cl = cl -> next) | |
| 93 { | |
| 94 as -> cl = cl; | |
| 95 | |
| 96 // simplify address | |
| 97 lwasm_reduce_expr(as, cl -> addr); | |
| 98 | |
| 99 // simplify each expression | |
| 100 for (le = cl -> exprs; le; le = le -> next) | |
| 101 lwasm_reduce_expr(as, le -> expr); | |
| 102 | |
| 103 if (cl -> len == -1) | |
| 104 { | |
| 105 // try resolving the instruction length | |
| 106 // but don't force resolution | |
| 107 if (cl -> insn >= 0 && instab[cl -> insn].resolve) | |
| 108 { | |
| 109 (instab[cl -> insn].resolve)(as, cl, 0); | |
| 110 if (cl -> len != -1) | |
| 111 { | |
| 112 rc++; | |
| 113 cnt--; | |
| 114 if (cnt == 0) | |
| 115 return; | |
| 116 } | |
| 117 } | |
| 118 } | |
| 119 } | |
| 120 if (as -> errorcount > 0) | |
| 121 return; | |
| 122 } while (rc > 0); | |
| 123 } | |
| 124 } | |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
371
diff
changeset
|
125 |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
371
diff
changeset
|
126 void do_pass4(asmstate_t *as) |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
371
diff
changeset
|
127 { |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
371
diff
changeset
|
128 do_pass4_aux(as, 1); |
|
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
371
diff
changeset
|
129 } |