diff options
Diffstat (limited to 'contrib/libpcap/optimize.c')
| -rw-r--r-- | contrib/libpcap/optimize.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/contrib/libpcap/optimize.c b/contrib/libpcap/optimize.c index bb3b6c9..a3ef13e 100644 --- a/contrib/libpcap/optimize.c +++ b/contrib/libpcap/optimize.c @@ -22,7 +22,7 @@ */ #ifndef lint static const char rcsid[] = - "@(#) $Header: /tcpdump/master/libpcap/optimize.c,v 1.67 2000/11/19 13:37:20 itojun Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/libpcap/optimize.c,v 1.69 2001/11/12 21:57:06 fenner Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -940,7 +940,10 @@ opt_stmt(s, val, alter) op = BPF_OP(s->code); if (alter) { if (s->k == 0) { - if (op == BPF_ADD || op == BPF_SUB || + /* don't optimize away "sub #0" + * as it may be needed later to + * fixup the generated math code */ + if (op == BPF_ADD || op == BPF_LSH || op == BPF_RSH || op == BPF_OR) { s->code = NOP; @@ -1578,8 +1581,10 @@ opt_loop(root, do_stmts) { #ifdef BDEBUG - if (dflag > 1) + if (dflag > 1) { + printf("opt_loop(root, %d) begin\n", do_stmts); opt_dump(root); + } #endif do { done = 1; @@ -1590,8 +1595,10 @@ opt_loop(root, do_stmts) find_edom(root); opt_blks(root, do_stmts); #ifdef BDEBUG - if (dflag > 1) + if (dflag > 1) { + printf("opt_loop(root, %d) bottom, done=%d\n", do_stmts, done); opt_dump(root); + } #endif } while (!done); } @@ -1611,7 +1618,19 @@ bpf_optimize(rootp) opt_loop(root, 0); opt_loop(root, 1); intern_blocks(root); +#ifdef BDEBUG + if (dflag > 1) { + printf("after intern_blocks()\n"); + opt_dump(root); + } +#endif opt_root(rootp); +#ifdef BDEBUG + if (dflag > 1) { + printf("after opt_root()\n"); + opt_dump(root); + } +#endif opt_cleanup(); } @@ -2075,7 +2094,7 @@ icode_to_fcode(root, lenp) struct bpf_insn *fp; /* - * Loop doing convert_codr_r() until no branches remain + * Loop doing convert_code_r() until no branches remain * with too-large offsets. */ while (1) { |
