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hush: in run_list(), some loop_top ops seems to be superfluous.
comment them out. Also, use separate temp variable for verification loop, helps gcc to optimize better. function old new delta run_list 2039 1984 -55
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30
shell/hush.c
30
shell/hush.c
@ -2016,7 +2016,7 @@ static int run_list(struct pipe *pi)
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char *case_word = NULL;
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#endif
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#if ENABLE_HUSH_LOOPS
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struct pipe *loop_top;
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struct pipe *loop_top = loop_top; /* just for compiler */
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char *for_varname = NULL;
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char **for_lcur = NULL;
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char **for_list = NULL;
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@ -2024,7 +2024,7 @@ static int run_list(struct pipe *pi)
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smallint flag_goto_looptop = 0;
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#endif
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smallint flag_skip = 1;
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smalluint rcode = 0; /* probably for gcc only */
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smalluint rcode = 0; /* probably just for compiler */
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#if ENABLE_HUSH_IF
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smalluint cond_code = 0;
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///experimentally off: last_cond_code seems to be bogus
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@ -2039,21 +2039,21 @@ static int run_list(struct pipe *pi)
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#if ENABLE_HUSH_LOOPS
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/* check syntax for "for" */
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for (loop_top = pi; loop_top; loop_top = loop_top->next) {
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if (loop_top->res_word != RES_FOR && loop_top->res_word != RES_IN)
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for (struct pipe *cpipe = pi; cpipe; cpipe = cpipe->next) {
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if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN)
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continue;
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/* current word is FOR or IN (BOLD in comments below) */
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if (loop_top->next == NULL) {
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if (cpipe->next == NULL) {
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syntax("malformed for");
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debug_printf_exec("run_list lvl %d return 1\n", run_list_level);
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return 1;
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}
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/* "FOR v; do ..." and "for v IN a b; do..." are ok */
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if (loop_top->next->res_word == RES_DO)
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if (cpipe->next->res_word == RES_DO)
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continue;
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/* next word is not "do". It must be "in" then ("FOR v in ...") */
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if (loop_top->res_word == RES_IN /* "for v IN a b; not_do..."? */
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|| loop_top->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
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if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
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|| cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
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) {
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syntax("malformed for");
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debug_printf_exec("run_list lvl %d return 1\n", run_list_level);
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@ -2118,10 +2118,10 @@ static int run_list(struct pipe *pi)
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if (rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) {
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/* start of a loop: remember it */
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flag_goto_looptop = 0; /* not yet reached final "done" */
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if (!loop_top) { /* hmm why this check is needed? */
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flag_run_loop = 0; /* suppose loop condition is false (for now) */
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// if (!loop_top) { /* hmm why this check is needed? */
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// flag_run_loop = 0; /* suppose loop condition is false (for now) */
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loop_top = pi; /* remember where loop starts */
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}
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// }
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}
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#endif
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if (rword == skip_more_for_this_rword && flag_skip) {
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@ -2145,7 +2145,7 @@ static int run_list(struct pipe *pi)
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break; /* "if <true> then ... ELIF cmd": skip cmd and all following ones */
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#endif
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#if ENABLE_HUSH_LOOPS
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if (rword == RES_FOR && pi->num_progs) {
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if (rword == RES_FOR && pi->num_progs) { /* hmm why "&& pi->num_progs"? */
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if (!for_lcur) {
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/* first loop through for */
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@ -2158,7 +2158,7 @@ static int run_list(struct pipe *pi)
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char **vals;
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vals = (char**)encoded_dollar_at_argv;
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if (loop_top->next->res_word == RES_IN) {
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if (pi->next->res_word == RES_IN) {
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/* if no variable values after "in" we skip "for" */
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if (!pi->next->progs->argv)
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continue;
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@ -2196,8 +2196,8 @@ static int run_list(struct pipe *pi)
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if (rword == RES_DONE) { /* end of loop? */
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if (flag_run_loop) {
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flag_goto_looptop = 1;
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} else {
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loop_top = NULL;
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// } else {
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// loop_top = NULL;
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}
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continue; //TEST /* "done" has no cmd anyway */
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}
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