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view lwasm/insn_gen.c @ 264:346966cffeef
Clean up various warnings when building under -Wall
Add some gimmicks to prevent fread() and fwrite() warnings about ignoring
the return value. Yes, this is probably not a good thing to do, but doing
something with a non-success return value is going to involve crashing out
or something anyway.
Also fix several warnings about variables used while possibly uninitialized.
The code flow shows that this cannot be the case but initializing them to a
plausible value at declaration time costs pretty much nothing and it makes
gcc happy.
Also caught a use of | instead of || which probably would have caused a
certain check for duplicate declarations in __os9 sections to behave oddly.
author | William Astle <lost@l-w.ca> |
---|---|
date | Wed, 06 Feb 2013 21:43:10 -0700 |
parents | 67acad9db5b3 |
children | 210d261a614d |
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/* insn_gen.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/>. Contains code for parsing general addressing modes (IMM+DIR+EXT+IND) */ #include <ctype.h> #include <stdlib.h> #include <lw_expr.h> #include "lwasm.h" #include "instab.h" extern void insn_indexed_parse_aux(asmstate_t *as, line_t *l, char **p); extern void insn_indexed_resolve_aux(asmstate_t *as, line_t *l, int force, int elen); extern void insn_indexed_emit_aux(asmstate_t *as, line_t *l); extern void insn_parse_indexed_aux(asmstate_t *as, line_t *l, char **p); extern void insn_resolve_indexed_aux(asmstate_t *as, line_t *l, int force, int elen); // "extra" is required due to the way OIM, EIM, TIM, and AIM work void insn_parse_gen_aux(asmstate_t *as, line_t *l, char **p, int elen) { const char *optr2; int v1, tv; lw_expr_t s; if (!**p) { lwasm_register_error(as, l, "Bad operand"); return; } optr2 = *p; while (*optr2 && !isspace(*optr2) && *optr2 != ',') optr2++ /* do nothing */ ; if (*optr2 == ',' || **p == '[') { l -> lint = -1; l -> lint2 = 1; insn_parse_indexed_aux(as, l, p); l -> minlen = OPLEN(instab[l -> insn].ops[1]) + 1 + elen; l -> maxlen = OPLEN(instab[l -> insn].ops[1]) + 3 + elen; goto out; } if (**p == '<') { (*p)++; l -> lint2 = 0; } // for compatibility with asxxxx // * followed by a digit, alpha, or _, or ., or ?, or another * is "f8" else if (**p == '*') { tv = *(*p + 1); if (isdigit(tv) || isalpha(tv) || tv == '_' || tv == '.' || tv == '?' || tv == '@' || tv == '*' || tv == '+' || tv == '-') { l -> lint2 = 0; (*p)++; } } else if (**p == '>') { (*p)++; l -> lint2 = 2; } else { l -> lint2 = -1; } l -> minlen = OPLEN(instab[l -> insn].ops[0]) + 1 + elen; l -> maxlen = OPLEN(instab[l -> insn].ops[2]) + 2 + elen; s = lwasm_parse_expr(as, p); if (!s) { lwasm_register_error(as, l, "Bad operand"); return; } lwasm_save_expr(l, 0, s); if (as -> output_format == OUTPUT_OBJ && l -> lint2 == -1) { l -> lint2 = 2; goto out; } if (l -> lint2 != -1) goto out; // if we have a constant now, figure out dp vs nondp if (lw_expr_istype(s, lw_expr_type_int)) { v1 = lw_expr_intval(s); if (((v1 >> 8) & 0xff) == (l -> dpval & 0xff)) { l -> lint2 = 0; goto out; } l -> lint2 = 2; } else { int min; int max; if (lwasm_calculate_range(as, s, &min, &max) == 0) { // fprintf(stderr, "range (P) %d...%d for %s\n", min, max, lw_expr_print(s)); if (min > max) { // we don't know what to do in this case so don't do anything goto out; } min = (min >> 8) & 0xff; max = (max >> 8) & 0xff; if ((l -> dpval & 0xff) < min || (l -> dpval & 0xff) > max) { l -> lint2 = 2; goto out; } if (min == max && (l -> dpval & 0xff) == min) { l -> lint2 = 0; goto out; } // if here, we don't know if the value is in the DP or not { l -> lint2 = -1; goto out; } } } out: if (l -> lint2 != -1) { if (l -> lint2 == 0) { l -> len = OPLEN(instab[l -> insn].ops[0]) + 1 + elen; } else if (l -> lint2 == 2) { l -> len = OPLEN(instab[l -> insn].ops[2]) + 2 + elen; } else if (l -> lint2 == 1 && l -> lint != -1) { l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1 + elen; } } } void insn_resolve_gen_aux(asmstate_t *as, line_t *l, int force, int elen) { lw_expr_t e; if (l -> lint2 == 1) { // indexed insn_resolve_indexed_aux(as, l, force, elen); goto out; } if (l -> lint2 != -1) return; e = lwasm_fetch_expr(l, 0); lwasm_reduce_expr(as, e); if (lw_expr_istype(e, lw_expr_type_int)) { int v; v = lw_expr_intval(e); if (((v >> 8) & 0xff) == (l -> dpval & 0xff)) { l -> lint2 = 0; goto out; } l -> lint2 = 2; goto out; } else { int min; int max; if (lwasm_calculate_range(as, e, &min, &max) == 0) { // fprintf(stderr, "range (R) %d...%d for %s\n", min, max, lw_expr_print(e)); if (min > max) { // we don't know what to do in this case so don't do anything goto out; } min = (min >> 8) & 0xff; max = (max >> 8) & 0xff; if ((l -> dpval & 0xff) < min || (l -> dpval & 0xff) > max) { l -> lint2 = 2; goto out; } if (min == max && (l -> dpval & 0xff) == min) { l -> lint2 = 0; goto out; } // if here, we don't know if the value is in the DP or not { l -> lint2 = -1; goto out; } } } if (force) { l -> lint2 = 2; } out: if (l -> lint2 != -1) { if (l -> lint2 == 0) { l -> len = OPLEN(instab[l -> insn].ops[0]) + 1 + elen; } else if (l -> lint2 == 2) { l -> len = OPLEN(instab[l -> insn].ops[2]) + 2 + elen; } else if (l -> lint2 == 1 && l -> lint != -1) { l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1 + elen; } } } void insn_emit_gen_aux(asmstate_t *as, line_t *l, int extra) { lw_expr_t e; e = lwasm_fetch_expr(l, 0); lwasm_emitop(l, instab[l -> insn].ops[l -> lint2]); if (extra != -1) lwasm_emit(l, extra); if (l -> lint2 == 1) { lwasm_emit(l, l -> pb); if (l -> lint > 0) lwasm_emitexpr(l, e, l -> lint); return; } if (l -> lint2 == 2) lwasm_emitexpr(l, e, 2); else lwasm_emitexpr(l, e, 1); } // the various insn_gen? functions have an immediate mode of ? bits PARSEFUNC(insn_parse_gen0) { if (**p == '#') { lwasm_register_error(as, l, "Immediate mode not allowed"); return; } // handle non-immediate insn_parse_gen_aux(as, l, p, 0); } RESOLVEFUNC(insn_resolve_gen0) { if (l -> len != -1) return; // handle non-immediate insn_resolve_gen_aux(as, l, force, 0); } EMITFUNC(insn_emit_gen0) { insn_emit_gen_aux(as, l, -1); } PARSEFUNC(insn_parse_gen8) { if (**p == '#') { lw_expr_t e; (*p)++; e = lwasm_parse_expr(as, p); if (!e) { lwasm_register_error(as, l, "Bad operand"); return; } l -> len = OPLEN(instab[l -> insn].ops[3]) + 1; l -> lint2 = 3; lwasm_save_expr(l, 0, e); return; } // handle non-immediate insn_parse_gen_aux(as, l, p, 0); if (l -> lint2 != -1) { if (l -> lint2 == 0) { l -> len = OPLEN(instab[l -> insn].ops[0]) + 1; } else if (l -> lint2 == 2) { l -> len = OPLEN(instab[l -> insn].ops[2]) + 2; } else if (l -> lint2 == 1 && l -> lint != -1) { l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1; } } } RESOLVEFUNC(insn_resolve_gen8) { if (l -> len != -1) return; // handle non-immediate insn_resolve_gen_aux(as, l, force, 0); } EMITFUNC(insn_emit_gen8) { if (l -> lint2 == 3) { lw_expr_t e; e = lwasm_fetch_expr(l, 0); lwasm_emitop(l, instab[l -> insn].ops[3]); lwasm_emitexpr(l, e, 1); return; } insn_emit_gen_aux(as, l, -1); } PARSEFUNC(insn_parse_gen16) { if (**p == '#') { lw_expr_t e; (*p)++; e = lwasm_parse_expr(as, p); if (!e) { lwasm_register_error(as, l, "Bad operand"); return; } l -> len = OPLEN(instab[l -> insn].ops[3]) + 2; l -> lint2 = 3; lwasm_save_expr(l, 0, e); return; } // handle non-immediate insn_parse_gen_aux(as, l, p, 0); if (l -> lint2 != -1) { if (l -> lint2 == 0) { l -> len = OPLEN(instab[l -> insn].ops[0]) + 1; } else if (l -> lint2 == 2) { l -> len = OPLEN(instab[l -> insn].ops[2]) + 2; } else if (l -> lint2 == 1 && l -> lint != -1) { l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1; } } } RESOLVEFUNC(insn_resolve_gen16) { if (l -> len != -1) return; // handle non-immediate insn_resolve_gen_aux(as, l, force, 0); } EMITFUNC(insn_emit_gen16) { if (l -> lint2 == 3) { lw_expr_t e; e = lwasm_fetch_expr(l, 0); lwasm_emitop(l, instab[l -> insn].ops[3]); lwasm_emitexpr(l, e, 2); return; } insn_emit_gen_aux(as, l, -1); } PARSEFUNC(insn_parse_gen32) { if (**p == '#') { lw_expr_t e; (*p)++; e = lwasm_parse_expr(as, p); if (!e) { lwasm_register_error(as, l, "Bad operand"); return; } l -> len = OPLEN(instab[l -> insn].ops[3]) + 4; l -> lint2 = 3; lwasm_save_expr(l, 0, e); return; } // handle non-immediate insn_parse_gen_aux(as, l, p, 0); if (l -> lint2 != -1) { if (l -> lint2 == 0) { l -> len = OPLEN(instab[l -> insn].ops[0]) + 1; } else if (l -> lint2 == 2) { l -> len = OPLEN(instab[l -> insn].ops[2]) + 2; } else if (l -> lint2 == 1 && l -> lint != -1) { l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1; } } } RESOLVEFUNC(insn_resolve_gen32) { if (l -> len != -1) return; // handle non-immediate insn_resolve_gen_aux(as, l, force, 0); } EMITFUNC(insn_emit_gen32) { if (l -> lint2 == 3) { lw_expr_t e; e = lwasm_fetch_expr(l, 0); lwasm_emitop(l, instab[l -> insn].ops[3]); lwasm_emitexpr(l, e, 4); return; } insn_emit_gen_aux(as, l, -1); } PARSEFUNC(insn_parse_imm8) { lw_expr_t e; if (**p == '#') { (*p)++; e = lwasm_parse_expr(as, p); if (!e) { lwasm_register_error(as, l, "Bad operand"); return; } l -> len = OPLEN(instab[l -> insn].ops[0]) + 1; lwasm_save_expr(l, 0, e); } else { lwasm_register_error(as, l, "Bad operand"); } } EMITFUNC(insn_emit_imm8) { lw_expr_t e; lwasm_emitop(l, instab[l -> insn].ops[0]); e = lwasm_fetch_expr(l, 0); lwasm_emitexpr(l, e, 1); }