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Add string -> number conversion for preproc expression evaluator Q&D conversion from string to signed number. It should be noted that this really should be done during tokenization and the type of number be set by the tokenizer, including parsing floating point values. Then the preprocessor can decide what to do with non-integer numbers.
author William Astle <lost@l-w.ca>
date Sun, 15 Sep 2013 14:22:10 -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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16
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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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24
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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 }