Mercurial > hg > index.cgi
view lwasm/insn_tfm.c @ 502:14a40f8bb4eb
Add various operators to lwcc
Add various binary and ternary operators to lwcc, but only those which can
work with constant operands. Seems like variables are probably required
next.
author | William Astle <lost@l-w.ca> |
---|---|
date | Wed, 25 Sep 2019 20:23:49 -0600 |
parents | b20f14edda5a |
children | 01bdad2118aa |
line wrap: on
line source
/* insn_tfm.c Copyright © 2009 William Astle This file is part of LWASM. LWASM is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <ctype.h> #include <string.h> #include "lwasm.h" #include "instab.h" PARSEFUNC(insn_parse_tfm) { static const char *reglist = "DXYUS AB 00EF"; int r0, r1; char *c; int tfm = 0; c = strchr(reglist, toupper(*(*p)++)); if (!c) { lwasm_register_error(as, l, E_REGISTER_BAD); return; } r0 = c - reglist; if (**p == '+') { (*p)++; tfm = 1; } else if (**p == '-') { (*p)++; tfm = 2; } lwasm_skip_to_next_token(l, p); if (*(*p)++ != ',') { lwasm_register_error(as, l, E_UNKNOWN_OPERATION); return; } lwasm_skip_to_next_token(l, p); c = strchr(reglist, toupper(*(*p)++)); if (!c) { lwasm_register_error(as, l, E_REGISTER_BAD); return; } r1 = c - reglist; if (**p == '+') { (*p)++; tfm |= 4; } else if (**p == '-') { (*p)++; tfm |= 8; } if (**p && !isspace(**p)) { lwasm_register_error(as, l, E_OPERAND_BAD); return; } /* only D, X, Y, U, S are valid tfm registers */ if (r0 > 4 || r1 > 4) { if (r0 < r1) r0 = r1; lwasm_register_error2(as, l, E_REGISTER_BAD, "'%c'", reglist[r0]); } // valid values of tfm here are: // 1: r0+,r1 (2) // 4: r0,r1+ (3) // 5: r0+,r1+ (0) // 10: r0-,r1- (1) switch (tfm) { case 5: //r0+,r1+ l -> lint = instab[l -> insn].ops[0]; break; case 10: //r0-,r1- l -> lint = instab[l -> insn].ops[1]; break; case 1: // r0+,r1 l -> lint = instab[l -> insn].ops[2]; break; case 4: // r0,r1+ l -> lint = instab[l -> insn].ops[3]; break; default: lwasm_register_error(as, l, E_UNKNOWN_OPERATION); return; } l -> pb = (r0 << 4) | r1; l -> len = OPLEN(l -> lint) + 1; } EMITFUNC(insn_emit_tfm) { lwasm_emitop(l, l -> lint); lwasm_emit(l, l -> pb); } PARSEFUNC(insn_parse_tfmrtor) { int r0, r1; static const char *regs = "D X Y U S A B 0 0 E F "; // register to register (r0,r1) // registers are in order: // D,X,Y,U,S,PC,W,V // A,B,CC,DP,0,0,E,F r0 = lwasm_lookupreg2(regs, p); lwasm_skip_to_next_token(l, p); if (r0 < 0 || *(*p)++ != ',') { lwasm_register_error(as, l, E_OPERAND_BAD); r0 = r1 = 0; } else { lwasm_skip_to_next_token(l, p); r1 = lwasm_lookupreg2(regs, p); if (r1 < 0) { lwasm_register_error(as, l, E_OPERAND_BAD); r0 = r1 = 0; } } l -> len = instab[l -> insn].ops[0] + 1; l -> pb = (r0 << 4) | r1; } EMITFUNC(insn_emit_tfmrtor) { lwasm_emitop(l, instab[l -> insn].ops[0]); lwasm_emit(l, l -> pb); }