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hush: ifdef out parts which are not needed

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if neither loops nor ifs are supported. Code savings:

function                                             old     new   delta
parse_stream                                        1758    1757      -1
checkjobs                                            335     318     -17
done_pipe                                             74      52     -22
expand_variables                                    1437    1407     -30
run_list                                            1232    1189     -43
parse_and_run_stream                                 328     267     -61
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/6 up/down: 0/-174)           Total: -174 bytes
This commit is contained in:
Denis Vlasenko 2008-06-24 00:50:07 +00:00
parent 003f9fb213
commit 5ec6132c98
1 changed files with 59 additions and 46 deletions
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101
shell/hush.c
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@ -150,9 +150,6 @@
#define debug_printf_subst(...) fprintf(stderr, __VA_ARGS__) #define debug_printf_subst(...) fprintf(stderr, __VA_ARGS__)
#endif #endif
/* Keep unconditionally on for now */
#define ENABLE_HUSH_DEBUG 1
#ifndef debug_printf_clean #ifndef debug_printf_clean
/* broken, of course, but OK for testing */ /* broken, of course, but OK for testing */
static const char *indenter(int i) static const char *indenter(int i)
@ -176,7 +173,6 @@ static void debug_print_strings(const char *prefix, char **vv)
#define debug_print_strings(prefix, vv) ((void)0) #define debug_print_strings(prefix, vv) ((void)0)
#endif #endif
/* /*
* Leak hunting. Use hush_leaktool.sh for post-processing. * Leak hunting. Use hush_leaktool.sh for post-processing.
*/ */
@ -216,6 +212,20 @@ void xxfree(void *ptr)
#endif #endif
/* Keep unconditionally on for now */
#define HUSH_DEBUG 1
/* Do we support ANY keywords? */
#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS
#define HAS_KEYWORDS 1
#define IF_HAS_KEYWORDS(...) __VA_ARGS__
#define IF_HAS_NO_KEYWORDS(...)
#else
#define HAS_KEYWORDS 0
#define IF_HAS_KEYWORDS(...)
#define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
#endif
#define SPECIAL_VAR_SYMBOL 3 #define SPECIAL_VAR_SYMBOL 3
#define PARSEFLAG_EXIT_FROM_LOOP 1 #define PARSEFLAG_EXIT_FROM_LOOP 1
@ -276,18 +286,20 @@ struct p_context {
struct pipe *list_head; struct pipe *list_head;
struct pipe *pipe; struct pipe *pipe;
struct redir_struct *pending_redirect; struct redir_struct *pending_redirect;
smallint res_w; #if HAS_KEYWORDS
smallint ctx_res_w;
smallint ctx_inverted; /* "! cmd | cmd" */ smallint ctx_inverted; /* "! cmd | cmd" */
int old_flag; /* bitmask of FLAG_xxx, for figuring out valid reserved words */ int old_flag; /* bitmask of FLAG_xxx, for figuring out valid reserved words */
struct p_context *stack; struct p_context *stack;
#endif
}; };
struct redir_struct { struct redir_struct {
struct redir_struct *next; struct redir_struct *next;
smallint /*redir_type*/ rd_type; char *rd_filename; /* filename */
int fd; /* file descriptor being redirected */ int fd; /* file descriptor being redirected */
int dup; /* -1, or file descriptor being duplicated */ int dup; /* -1, or file descriptor being duplicated */
char *rd_filename; /* filename */ smallint /*enum redir_type*/ rd_type;
}; };
struct child_prog { struct child_prog {
@ -317,9 +329,9 @@ struct pipe {
char *cmdtext; /* name of job */ char *cmdtext; /* name of job */
#endif #endif
struct child_prog *progs; /* array of commands in pipe */ struct child_prog *progs; /* array of commands in pipe */
smallint pi_inverted; /* "! cmd | cmd" */
smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
smallint res_word; /* needed for if, for, while, until... */ IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */
IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */
}; };
/* On program start, environ points to initial environment. /* On program start, environ points to initial environment.
@ -1629,8 +1641,7 @@ static int checkjobs(struct pipe* fg_pipe)
if (i == fg_pipe->num_progs - 1) { if (i == fg_pipe->num_progs - 1) {
/* last process gives overall exitstatus */ /* last process gives overall exitstatus */
rcode = WEXITSTATUS(status); rcode = WEXITSTATUS(status);
if (fg_pipe->pi_inverted) IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;)
rcode = !rcode;
} }
} else { } else {
fg_pipe->progs[i].is_stopped = 1; fg_pipe->progs[i].is_stopped = 1;
@ -1757,8 +1768,7 @@ static int run_pipe(struct pipe *pi)
rcode = run_list(child->group) & 0xff; rcode = run_list(child->group) & 0xff;
restore_redirects(squirrel); restore_redirects(squirrel);
debug_printf_exec("run_pipe return %d\n", rcode); debug_printf_exec("run_pipe return %d\n", rcode);
if (pi->pi_inverted) IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
rcode = !rcode;
return rcode; return rcode;
} }
@ -1801,8 +1811,7 @@ static int run_pipe(struct pipe *pi)
free(argv_expanded); free(argv_expanded);
restore_redirects(squirrel); restore_redirects(squirrel);
debug_printf_exec("run_pipe return %d\n", rcode); debug_printf_exec("run_pipe return %d\n", rcode);
if (pi->pi_inverted) IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
rcode = !rcode;
return rcode; return rcode;
} }
} }
@ -1819,8 +1828,7 @@ static int run_pipe(struct pipe *pi)
free(argv_expanded); free(argv_expanded);
restore_redirects(squirrel); restore_redirects(squirrel);
debug_printf_exec("run_pipe return %d\n", rcode); debug_printf_exec("run_pipe return %d\n", rcode);
if (pi->pi_inverted) IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
rcode = !rcode;
return rcode; return rcode;
} }
} }
@ -2003,8 +2011,7 @@ static int run_list(struct pipe *pi)
#else #else
enum { if_code = 0, next_if_code = 0 }; enum { if_code = 0, next_if_code = 0 };
#endif #endif
// TODO: rword and ->res_word are not needed if !LOOPS and !IF reserved_style rword IF_HAS_NO_KEYWORDS(= RES_NONE);
reserved_style rword;
reserved_style skip_more_for_this_rword = RES_XXXX; reserved_style skip_more_for_this_rword = RES_XXXX;
debug_printf_exec("run_list start lvl %d\n", run_list_level + 1); debug_printf_exec("run_list start lvl %d\n", run_list_level + 1);
@ -2075,7 +2082,8 @@ static int run_list(struct pipe *pi)
#endif /* JOB */ #endif /* JOB */
for (; pi; pi = flag_restore ? rpipe : pi->next) { for (; pi; pi = flag_restore ? rpipe : pi->next) {
rword = pi->res_word; IF_HAS_KEYWORDS(rword = pi->res_word;)
IF_HAS_NO_KEYWORDS(rword = RES_NONE;)
#if ENABLE_HUSH_LOOPS #if ENABLE_HUSH_LOOPS
if (rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) { if (rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) {
flag_restore = 0; flag_restore = 0;
@ -2272,7 +2280,9 @@ static int free_pipe_list(struct pipe *head, int indent)
struct pipe *pi, *next; struct pipe *pi, *next;
for (pi = head; pi; pi = next) { for (pi = head; pi; pi = next) {
#if HAS_KEYWORDS
debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word); debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
#endif
rcode = free_pipe(pi, indent); rcode = free_pipe(pi, indent);
debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup); debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
next = pi->next; next = pi->next;
@ -2548,7 +2558,7 @@ static char *expand_string_to_string(const char *str)
argv[0] = (char*)str; argv[0] = (char*)str;
argv[1] = NULL; argv[1] = NULL;
list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */ list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
if (ENABLE_HUSH_DEBUG) if (HUSH_DEBUG)
if (!list[0] || list[1]) if (!list[0] || list[1])
bb_error_msg_and_die("BUG in varexp2"); bb_error_msg_and_die("BUG in varexp2");
/* actually, just move string 2*sizeof(char*) bytes back */ /* actually, just move string 2*sizeof(char*) bytes back */
@ -2567,7 +2577,7 @@ static char* expand_strvec_to_string(char **argv)
if (list[0]) { if (list[0]) {
int n = 1; int n = 1;
while (list[n]) { while (list[n]) {
if (ENABLE_HUSH_DEBUG) if (HUSH_DEBUG)
if (list[n-1] + strlen(list[n-1]) + 1 != list[n]) if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
bb_error_msg_and_die("BUG in varexp3"); bb_error_msg_and_die("BUG in varexp3");
list[n][-1] = ' '; /* TODO: or to ifs[0]? */ list[n][-1] = ' '; /* TODO: or to ifs[0]? */
@ -2747,8 +2757,7 @@ static struct pipe *new_pipe(void)
struct pipe *pi; struct pipe *pi;
pi = xzalloc(sizeof(struct pipe)); pi = xzalloc(sizeof(struct pipe));
/*pi->followup = 0; - deliberately invalid value */ /*pi->followup = 0; - deliberately invalid value */
if (RES_NONE) /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */
pi->res_word = RES_NONE;
return pi; return pi;
} }
@ -2769,7 +2778,7 @@ static void initialize_context(struct p_context *ctx)
* Handles if, then, elif, else, fi, for, while, until, do, done. * Handles if, then, elif, else, fi, for, while, until, do, done.
* case, function, and select are obnoxious, save those for later. * case, function, and select are obnoxious, save those for later.
*/ */
#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS #if HAS_KEYWORDS
static int reserved_word(const o_string *word, struct p_context *ctx) static int reserved_word(const o_string *word, struct p_context *ctx)
{ {
struct reserved_combo { struct reserved_combo {
@ -2828,18 +2837,18 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
debug_printf("found reserved word %s, res %d\n", r->literal, r->res); debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
if (r->flag == 0) { /* '!' */ if (r->flag == 0) { /* '!' */
#if ENABLE_HUSH_LOOPS #if ENABLE_HUSH_LOOPS
if (ctx->res_w == RES_IN) { if (ctx->ctx_res_w == RES_IN) {
/* 'for a in ! a b c; ...' - ! isn't a keyword here */ /* 'for a in ! a b c; ...' - ! isn't a keyword here */
break; break;
} }
#endif #endif
if (ctx->ctx_inverted /* bash doesn't accept '! ! true' */ if (ctx->ctx_inverted /* bash doesn't accept '! ! true' */
#if ENABLE_HUSH_LOOPS #if ENABLE_HUSH_LOOPS
|| ctx->res_w == RES_FOR /* example: 'for ! a' */ || ctx->ctx_res_w == RES_FOR /* example: 'for ! a' */
#endif #endif
) { ) {
syntax(NULL); syntax(NULL);
ctx->res_w = RES_SNTX; IF_HAS_KEYWORDS(ctx->ctx_res_w = RES_SNTX;)
} }
ctx->ctx_inverted = 1; ctx->ctx_inverted = 1;
return 1; return 1;
@ -2848,9 +2857,9 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
struct p_context *new; struct p_context *new;
debug_printf("push stack\n"); debug_printf("push stack\n");
#if ENABLE_HUSH_LOOPS #if ENABLE_HUSH_LOOPS
if (ctx->res_w == RES_IN || ctx->res_w == RES_FOR) { if (ctx->ctx_res_w == RES_IN || ctx->ctx_res_w == RES_FOR) {
syntax("malformed for"); /* example: 'for if' */ syntax("malformed for"); /* example: 'for if' */
ctx->res_w = RES_SNTX; ctx->ctx_res_w = RES_SNTX;
return 1; return 1;
} }
#endif #endif
@ -2858,12 +2867,12 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
*new = *ctx; /* physical copy */ *new = *ctx; /* physical copy */
initialize_context(ctx); initialize_context(ctx);
ctx->stack = new; ctx->stack = new;
} else if (ctx->res_w == RES_NONE || !(ctx->old_flag & (1 << r->res))) { } else if (ctx->ctx_res_w == RES_NONE || !(ctx->old_flag & (1 << r->res))) {
syntax(NULL); syntax(NULL);
ctx->res_w = RES_SNTX; ctx->ctx_res_w = RES_SNTX;
return 1; return 1;
} }
ctx->res_w = r->res; ctx->ctx_res_w = r->res;
ctx->old_flag = r->flag; ctx->old_flag = r->flag;
if (ctx->old_flag & FLAG_END) { if (ctx->old_flag & FLAG_END) {
struct p_context *old; struct p_context *old;
@ -2879,8 +2888,6 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
} }
return 0; return 0;
} }
#else
#define reserved_word(word, ctx) ((int)0)
#endif #endif
/* Word is complete, look at it and update parsing context. /* Word is complete, look at it and update parsing context.
@ -2914,15 +2921,17 @@ static int done_word(o_string *word, struct p_context *ctx)
debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n"); debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n");
return 1; return 1;
} }
#if HAS_KEYWORDS
if (!child->argv) { /* if it's the first word... */ if (!child->argv) { /* if it's the first word... */
debug_printf_parse(": checking '%s' for reserved-ness\n", word->data); debug_printf_parse(": checking '%s' for reserved-ness\n", word->data);
if (reserved_word(word, ctx)) { if (reserved_word(word, ctx)) {
o_reset(word); o_reset(word);
word->o_assignment = NOT_ASSIGNMENT; word->o_assignment = NOT_ASSIGNMENT;
debug_printf_parse("done_word return %d\n", (ctx->res_w == RES_SNTX)); debug_printf_parse("done_word return %d\n", (ctx->ctx_res_w == RES_SNTX));
return (ctx->res_w == RES_SNTX); return (ctx->ctx_res_w == RES_SNTX);
} }
} }
#endif
if (word->nonnull /* we saw "xx" or 'xx' */ if (word->nonnull /* we saw "xx" or 'xx' */
/* optimization: and if it's ("" or '') or ($v... or `cmd`...): */ /* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
&& (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL) && (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
@ -2942,7 +2951,7 @@ static int done_word(o_string *word, struct p_context *ctx)
#if ENABLE_HUSH_LOOPS #if ENABLE_HUSH_LOOPS
/* Force FOR to have just one word (variable name) */ /* Force FOR to have just one word (variable name) */
if (ctx->res_w == RES_FOR) if (ctx->ctx_res_w == RES_FOR)
done_pipe(ctx, PIPE_SEQ); done_pipe(ctx, PIPE_SEQ);
#endif #endif
debug_printf_parse("done_word return 0\n"); debug_printf_parse("done_word return 0\n");
@ -2993,9 +3002,9 @@ static void done_pipe(struct p_context *ctx, pipe_style type)
debug_printf_parse("done_pipe entered, followup %d\n", type); debug_printf_parse("done_pipe entered, followup %d\n", type);
not_null = done_command(ctx); /* implicit closure of previous command */ not_null = done_command(ctx); /* implicit closure of previous command */
ctx->pipe->followup = type; ctx->pipe->followup = type;
ctx->pipe->res_word = ctx->res_w; IF_HAS_KEYWORDS(ctx->pipe->res_word = ctx->ctx_res_w;)
ctx->pipe->pi_inverted = ctx->ctx_inverted; IF_HAS_KEYWORDS(ctx->pipe->pi_inverted = ctx->ctx_inverted;)
ctx->ctx_inverted = 0; IF_HAS_KEYWORDS(ctx->ctx_inverted = 0;)
/* Without this check, even just <enter> on command line generates /* Without this check, even just <enter> on command line generates
* tree of three NOPs (!). Which is harmless but annoying. * tree of three NOPs (!). Which is harmless but annoying.
* IOW: it is safe to do it unconditionally. * IOW: it is safe to do it unconditionally.
@ -3480,7 +3489,7 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
//err chk? //err chk?
done_pipe(ctx, PIPE_SEQ); done_pipe(ctx, PIPE_SEQ);
} }
if (ctx->res_w == RES_NONE) { if (!HAS_KEYWORDS IF_HAS_KEYWORDS(|| ctx->ctx_res_w == RES_NONE)) {
debug_printf_parse("parse_stream return 0: end_trigger char found\n"); debug_printf_parse("parse_stream return 0: end_trigger char found\n");
return 0; return 0;
} }
@ -3650,7 +3659,7 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
debug_printf_parse("parse_stream return 1: unexpected '}'\n"); debug_printf_parse("parse_stream return 1: unexpected '}'\n");
return 1; return 1;
default: default:
if (ENABLE_HUSH_DEBUG) if (HUSH_DEBUG)
bb_error_msg_and_die("BUG: unexpected %c\n", ch); bb_error_msg_and_die("BUG: unexpected %c\n", ch);
} }
} /* while (1) */ } /* while (1) */
@ -3706,10 +3715,12 @@ static int parse_and_run_stream(struct in_str *inp, int parse_flag)
* Example: "sleep 9999; echo TEST" + ctrl-C: * Example: "sleep 9999; echo TEST" + ctrl-C:
* TEST should be printed */ * TEST should be printed */
rcode = parse_stream(&temp, &ctx, inp, ";\n"); rcode = parse_stream(&temp, &ctx, inp, ";\n");
#if HAS_KEYWORDS
if (rcode != 1 && ctx.old_flag != 0) { if (rcode != 1 && ctx.old_flag != 0) {
syntax(NULL); syntax(NULL);
} }
if (rcode != 1 && ctx.old_flag == 0) { #endif
if (rcode != 1 IF_HAS_KEYWORDS(&& ctx.old_flag == 0)) {
done_word(&temp, &ctx); done_word(&temp, &ctx);
done_pipe(&ctx, PIPE_SEQ); done_pipe(&ctx, PIPE_SEQ);
debug_print_tree(ctx.list_head, 0); debug_print_tree(ctx.list_head, 0);
@ -3717,10 +3728,12 @@ static int parse_and_run_stream(struct in_str *inp, int parse_flag)
run_and_free_list(ctx.list_head); run_and_free_list(ctx.list_head);
} else { } else {
/* We arrive here also if rcode == 1 (error in parse_stream) */ /* We arrive here also if rcode == 1 (error in parse_stream) */
#if HAS_KEYWORDS
if (ctx.old_flag != 0) { if (ctx.old_flag != 0) {
free(ctx.stack); free(ctx.stack);
o_reset(&temp); o_reset(&temp);
} }
#endif
/*temp.nonnull = 0; - o_free does it below */ /*temp.nonnull = 0; - o_free does it below */
/*temp.o_quote = 0; - o_free does it below */ /*temp.o_quote = 0; - o_free does it below */
free_pipe_list(ctx.list_head, /* indent: */ 0); free_pipe_list(ctx.list_head, /* indent: */ 0);