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Fix crash on listing when nested noexpand macros are used Macros flagged noexpand were causing a segfault during listing. The problem was incorrect accounting for nesting levels for noexpand macros causing the listing handler to fall off the end of the program in certain circumstances and in other circumstances it would fail to suppress expansion. Both the segfault in the case of misbehaviour and the misbhaviour itself are corrected with this update. If you do not use nested noexpand macros, this bug has no effect.
author William Astle <lost@l-w.ca>
date Sat, 25 May 2013 13:35:46 -0600
parents 3a5f718b24c1
children c6d2a1f54e0c
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1 /*
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2 insn_rtor.c
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3 Copyright © 2010 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 */
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21
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22 #include "lwasm.h"
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23 #include "instab.h"
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25 PARSEFUNC(insn_parse_rtor)
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26 {
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27 int r0, r1;
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28
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29 static const char *regs = "D X Y U S PCW V A B CCDP0 0 E F ";
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30 static const char *regs9 = "D X Y U S PC A B CCDP ";
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31
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32 // register to register (r0,r1)
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33 // registers are in order:
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34 // D,X,Y,U,S,PC,W,V
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35 // A,B,CC,DP,0,0,E,F
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36
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37 r0 = lwasm_lookupreg2((as -> target == TARGET_6309) ? regs : regs9, p);
0
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38 if (r0 < 0 || *(*p)++ != ',')
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39 {
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40 lwasm_register_error(as, l, "Bad operand");
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41 r0 = r1 = 0;
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42 }
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43 else
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44 {
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45 r1 = lwasm_lookupreg2((as -> target == TARGET_6309) ? regs : regs9, p);
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46 if (r1 < 0)
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47 {
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48 lwasm_register_error(as, l, "Bad operand");
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49 r0 = r1 = 0;
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50 }
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51 }
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52 l -> pb = (r0 << 4) | r1;
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53 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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54 }
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55
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56 EMITFUNC(insn_emit_rtor)
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57 {
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58 lwasm_emitop(l, instab[l -> insn].ops[0]);
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59 lwasm_emit(l, l -> pb);
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60 }