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bc: select parse_init() and parse_expr() using IS_BC, not function pointers

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function                                             old     new   delta
common_parse_expr                                      -      62     +62
common_parse_init                                      -      29     +29
dc_parse_parse                                        53      52      -1
dc_parse_expr                                        723     719      -4
bc_program_execStr                                   606     594     -12
dc_parse_init                                         33      18     -15
bc_parse_init                                         33      18     -15
bc_parse_expression                                   39       -     -39
bc_vm_run                                           1923    1872     -51
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 0/6 up/down: 91/-137)           Total: -46 bytes
   text	   data	    bss	    dec	    hex	filename
 988774	    485	   7296	 996555	  f34cb	busybox_old
 988728	    485	   7296	 996509	  f349d	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-12-02 17:36:00 +01:00
parent 785e4b3057
commit f6c1da5ff3
1 changed files with 27 additions and 25 deletions
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52
miscutils/bc.c
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@ -662,9 +662,7 @@ struct BcParse;
struct BcProgram;
typedef void (*BcParseInit)(struct BcParse *, struct BcProgram *, size_t);
typedef BcStatus (*BcParseParse)(struct BcParse *);
typedef BcStatus (*BcParseExpr)(struct BcParse *, uint8_t);
typedef struct BcParse {
@ -724,7 +722,6 @@ static BcStatus bc_parse_expr(BcParse *p, uint8_t flags, BcParseNext next);
static BcStatus dc_lex_token(BcLex *l);
static void dc_parse_init(BcParse *p, struct BcProgram *prog, size_t func);
static BcStatus dc_parse_expr(BcParse *p, uint8_t flags);
#endif // ENABLE_DC
@ -768,9 +765,6 @@ typedef struct BcProgram {
size_t nchars;
BcParseInit parse_init;
BcParseExpr parse_expr;
} BcProgram;
#define BC_PROG_STACK(s, n) ((s)->len >= ((size_t) n))
@ -5259,6 +5253,24 @@ static void dc_parse_init(BcParse *p, BcProgram *prog, size_t func)
}
#endif // ENABLE_DC
static void common_parse_init(BcParse *p, BcProgram *prog, size_t func)
{
if (IS_BC) {
bc_parse_init(p, prog, func);
} else {
dc_parse_init(p, prog, func);
}
}
static BcStatus common_parse_expr(BcParse *p, uint8_t flags)
{
if (IS_BC) {
return bc_parse_expression(p, flags);
} else {
return dc_parse_expr(p, flags);
}
}
static void bc_program_search(BcProgram *p, char *id, BcVec **ret, bool var)
{
BcStatus s;
@ -5469,13 +5481,12 @@ static BcStatus bc_program_read(void)
s = bc_read_line(&buf, "read> ");
if (s) goto io_err;
p->parse_init(&parse, p, BC_PROG_READ);
common_parse_init(&parse, p, BC_PROG_READ);
bc_lex_file(&parse.l, bc_program_stdin_name);
s = bc_parse_text(&parse, buf.v);
if (s) goto exec_err;
/// replace by IS_BC selection
s = p->parse_expr(&parse, BC_PARSE_NOREAD);
s = common_parse_expr(&parse, BC_PARSE_NOREAD);
if (s) goto exec_err;
if (parse.l.t.t != BC_LEX_NLINE && parse.l.t.t != BC_LEX_EOF) {
@ -6453,12 +6464,10 @@ static BcStatus bc_program_execStr(char *code, size_t *bgn,
f = bc_vec_item(&p->fns, fidx);
if (f->code.len == 0) {
/// replace by IS_BC selection
p->parse_init(&prs, p, fidx);
common_parse_init(&prs, p, fidx);
s = bc_parse_text(&prs, *str);
if (s) goto err;
/// replace by IS_BC selection
s = p->parse_expr(&prs, BC_PARSE_NOCALL);
s = common_parse_expr(&prs, BC_PARSE_NOCALL);
if (s) goto err;
if (prs.l.t.t != BC_LEX_EOF) {
@ -7212,13 +7221,6 @@ static void bc_program_init(size_t line_len)
/* G.prog.nchars = G.prog.scale = 0; - already is */
G.prog.len = line_len;
if (IS_BC) {
G.prog.parse_init = bc_parse_init;
G.prog.parse_expr = bc_parse_expression;
} else {
G.prog.parse_init = dc_parse_init;
G.prog.parse_expr = dc_parse_expr;
}
bc_num_init(&G.prog.ib, BC_NUM_DEF_SIZE);
bc_num_ten(&G.prog.ib);
@ -7267,7 +7269,6 @@ static void bc_program_init(size_t line_len)
static void bc_vm_init(const char *env_len)
{
BcParseInit init;
size_t len = bc_vm_envLen(env_len);
#if ENABLE_FEATURE_BC_SIGNALS
@ -7280,13 +7281,14 @@ static void bc_vm_init(const char *env_len)
if (getenv("POSIXLY_CORRECT"))
G.flags |= BC_FLAG_S;
bc_vm_envArgs();
init = bc_parse_init;
} else {
init = dc_parse_init;
}
bc_program_init(len);
init(&G.prs, &G.prog, BC_PROG_MAIN);
if (IS_BC) {
bc_parse_init(&G.prs, &G.prog, BC_PROG_MAIN);
} else {
dc_parse_init(&G.prs, &G.prog, BC_PROG_MAIN);
}
}
static BcStatus bc_vm_run(int argc, char *argv[],