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annotate lwasm/insn_rtor.c @ 402:b20f14edda5a

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Completed initial conversion to new parser allowing spaces in operands Converted the remaining addressing modes. This required a complete rewrite of a large portion of the indexed addressing parser. Now the entire indexed parsing system is programmatic without cheating with a lookup table. This update also fixes the "force 0,r" by writing a literal 0,r which is *supposed* to work. There will likely be some pseudo ops that need tweaking for space handling, specially those that take multiple operands of some description which are not expressions. (The expression parser call eats the spaces both before and after the expression, if appropriate.)
author William Astle <lost@l-w.ca>
date Wed, 14 Oct 2015 20:49:41 -0600
parents 8764142b3192
children
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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(!CURPRAGMA(l, PRAGMA_6809) ? regs : regs9, p);
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38 lwasm_skip_to_next_token(l, p);
0
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39 if (r0 < 0 || *(*p)++ != ',')
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40 {
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41 lwasm_register_error(as, l, E_OPERAND_BAD);
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42 r0 = r1 = 0;
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43 }
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44 else
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45 {
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46 lwasm_skip_to_next_token(l, p);
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47 r1 = lwasm_lookupreg2(!CURPRAGMA(l, PRAGMA_6809) ? regs : regs9, p);
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48 if (r1 < 0)
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49 {
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50 lwasm_register_error(as, l, E_OPERAND_BAD);
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51 r0 = r1 = 0;
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52 }
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53 }
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54 l -> pb = (r0 << 4) | r1;
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55 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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56 }
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57
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58 EMITFUNC(insn_emit_rtor)
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59 {
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60 lwasm_emitop(l, instab[l -> insn].ops[0]);
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61 lwasm_emit(l, l -> pb);
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62 }