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view lwasm/pass4.c @ 277:1dcc0b174e3b lwtools-4.8
Bump version string to show 4.8 in preparation for release
author | William Astle <lost@l-w.ca> |
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date | Thu, 13 Jun 2013 22:12:35 -0600 |
parents | 8beb109dfd69 |
children | 8764142b3192 |
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/* pass4.c Copyright © 2010 William Astle This file is part of LWTOOLS. LWTOOLS 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 <stdio.h> #include <string.h> #include <lw_alloc.h> #include <lw_string.h> #include "lwasm.h" #include "instab.h" /* Resolve2 Pass Force resolution of instruction sizes. */ void do_pass4_aux(asmstate_t *as, int force) { int rc; int cnt; line_t *cl, *sl; struct line_expr_s *le; int trycount = 0; // first, count the number of unresolved instructions for (cnt = 0, cl = as -> line_head; cl; cl = cl -> next) { if (cl -> len == -1) cnt++; } sl = as -> line_head; while (cnt > 0) { trycount = cnt; debug_message(as, 60, "%d unresolved instructions", cnt); // find an unresolved instruction for ( ; sl && sl -> len != -1; sl = sl -> next) { debug_message(as, 200, "Search line %p", sl); as -> cl = sl; lwasm_reduce_expr(as, sl -> addr); lwasm_reduce_expr(as, sl -> daddr); // simplify each expression for (le = sl -> exprs; le; le = le -> next) lwasm_reduce_expr(as, le -> expr); } debug_message(as, 200, "Found line %p", sl); // simplify address as -> cl = sl; lwasm_reduce_expr(as, sl -> addr); lwasm_reduce_expr(as, sl -> daddr); // simplify each expression for (le = sl -> exprs; le; le = le -> next) lwasm_reduce_expr(as, le -> expr); if (sl -> len == -1 && sl -> insn >= 0 && instab[sl -> insn].resolve) { (instab[sl -> insn].resolve)(as, sl, 1); debug_message(as, 200, "Try resolve = %d/%d", sl -> len, sl -> dlen); if (force && sl -> len == -1 && sl -> dlen == -1) { lwasm_register_error(as, sl, "Instruction failed to resolve."); return; } } if (sl -> len != -1 && sl -> dlen != -1) { cnt--; if (cnt == 0) return; // this one resolved - try looking for the next one instead // of wasting time running through the rest of the lines continue; } do { debug_message(as, 200, "Flatten after..."); rc = 0; for (cl = sl; cl; cl = cl -> next) { debug_message(as, 200, "Flatten line %p", cl); as -> cl = cl; // simplify address lwasm_reduce_expr(as, cl -> addr); lwasm_reduce_expr(as, cl -> daddr); // simplify each expression for (le = cl -> exprs; le; le = le -> next) lwasm_reduce_expr(as, le -> expr); if (cl -> len == -1) { // try resolving the instruction length // but don't force resolution if (cl -> insn >= 0 && instab[cl -> insn].resolve) { (instab[cl -> insn].resolve)(as, cl, 0); if ((cl -> inmod == 0) && cl -> len >= 0 && cl -> dlen >= 0) { if (cl -> len == 0) cl -> len = cl -> dlen; else cl -> dlen = cl -> len; } debug_message(as, 200, "Flatten resolve returns %d", cl -> len); if (cl -> len != -1 && cl -> dlen != -1) { rc++; cnt--; if (cnt == 0) return; } } } } if (as -> errorcount > 0) return; } while (rc > 0); if (trycount == cnt) break; } } void do_pass4(asmstate_t *as) { do_pass4_aux(as, 1); }