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1335 Commits

Author SHA1 Message Date
Denys Vlasenko
30a8e0c2f9 bc: code shrink 
function                                             old     new   delta
zbc_program_print                                    684     680      -4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-4)               Total: -4 bytes
   text	   data	    bss	    dec	    hex	filename
 981368	    485	   7296	 989149	  f17dd	busybox_old
 981364	    485	   7296	 989145	  f17d9	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 19:20:04 +01:00
Denys Vlasenko
694d2982e5 bc: code shrink 
function                                             old     new   delta
bc_program_name                                       67      63      -4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-4)               Total: -4 bytes
   text	   data	    bss	    dec	    hex	filename
 981372	    485	   7296	 989153	  f17e1	busybox_old
 981368	    485	   7296	 989149	  f17dd	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 19:17:11 +01:00
Denys Vlasenko
7b30bc0222 bc: shrink bc_program_pushVar() 
function                                             old     new   delta
bc_program_pushVar                                   203     198      -5

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 17:14:34 +01:00
Denys Vlasenko
d340143247 bc: get rid of G.prog.ob, G.prog.strmb 
function                                             old     new   delta
zbc_num_printNum                                     489     540     +51
zbc_program_asciify                                  426     473     +47
zbc_program_print                                    686     684      -2
zbc_program_exec                                    4008    3995     -13
zbc_program_assign                                   474     440     -34
bc_vm_init                                           739     663     -76
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/4 up/down: 98/-125)           Total: -27 bytes
   text	   data	    bss	    dec	    hex	filename
 981404	    485	   7296	 989185	  f1801	busybox_old
 981377	    485	   7296	 989158	  f17e6	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 17:00:35 +01:00
Denys Vlasenko
09fe0aaefa bc: do not show -i in --help, it's a NOP (for now) 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 16:32:25 +01:00
Denys Vlasenko
7f2d59c38d bc: style edit, no code changes 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 16:24:07 +01:00
Denys Vlasenko
3f940c9c70 bc: shrink bc_program_index() 
function                                             old     new   delta
bc_program_index                                      66      47     -19
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-19)             Total: -19 bytes
   text	   data	    bss	    dec	    hex	filename
 981418	    485	   7296	 989199	  f180f	busybox_old
 981399	    485	   7296	 989180	  f17fc	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 15:49:42 +01:00
Denys Vlasenko
55f3cab7e9 bc: fix "echo -n '#foo' | bc" not eating last 'o' 
function                                             old     new   delta
zdc_parse_expr                                       656     653      -3
bc_lex_lineComment                                    39      36      -3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-6)               Total: -6 bytes
   text	   data	    bss	    dec	    hex	filename
 981424	    485	   7296	 989205	  f1815	busybox_old
 981418	    485	   7296	 989199	  f180f	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 14:39:33 +01:00
Denys Vlasenko
a199cc95b7 bc: shrink zdc_parse_expr() 
function                                             old     new   delta
zdc_parse_expr                                       656     653      -3

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 14:11:35 +01:00
Denys Vlasenko
07597cd35d bc: optimize zbc_lex_string() 
function                                             old     new   delta
zbc_lex_next                                        2359    2353      -6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 14:03:20 +01:00
Denys Vlasenko
ef271da33f bc: shrink zdc_lex_string() 
This actually fixes a rather obscure bug. This was failing to find
end of the string:

	$ echo -n '[foo]' | dc
	dc: string end could not be found

function                                             old     new   delta
zbc_lex_next                                        2230    2141     -89
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-89)             Total: -89 bytes
   text	   data	    bss	    dec	    hex	filename
 981461	    485	   7296	 989242	  f183a	busybox_old
 981372	    485	   7296	 989153	  f17e1	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 13:48:37 +01:00
Denys Vlasenko
d4258dd321 bc: another for() loop simplified 
function                                             old     new   delta
zbc_program_print                                    688     686      -2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 13:22:23 +01:00
Denys Vlasenko
5c0c5abba0 bc: simplify another for() loop 
function                                             old     new   delta
zbc_num_d                                            563     557      -6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 13:15:55 +01:00
Denys Vlasenko
6b0fbd14fc bc: rewrite more for() loops 
function                                             old     new   delta
bc_program_name                                       75      67      -8

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 12:55:40 +01:00
Denys Vlasenko
71c82d1d8c bc: rewrite another for() loop 
function                                             old     new   delta
zbc_num_d                                            570     563      -7

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 12:43:21 +01:00
Denys Vlasenko
e2e6ffd3c5 bc: replace signed division / 10 by unsigned 
function                                             old     new   delta
zbc_num_a                                            443     441      -2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 12:23:16 +01:00
Denys Vlasenko
4113e1f2cd bc: rewrite bc_num_compare() to be readable 
function                                             old     new   delta
bc_num_compare                                        59      51      -8

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 03:30:23 +01:00
Denys Vlasenko
57734c926b bc: fold zbc_num_stream() into its single caller 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 03:30:23 +01:00
Denys Vlasenko
f6e3f8511e bc: get rid of BcNum BcProgram::ib,hexb 
function                                             old     new   delta
zbc_program_num                                      907     943     +36
zbc_program_assign                                   485     474     -11
bc_vm_init                                           757     739     -18
bc_num_ten                                            30       -     -30
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/2 up/down: 36/-59)            Total: -23 bytes
   text	   data	    bss	    dec	    hex	filename
 981532	    485	   7296	 989313	  f1881	busybox_old
 981509	    485	   7296	 989290	  f186a	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 03:30:23 +01:00
Denys Vlasenko
0f31a5c79e bc: fixes to bugs found while testing 64-bit build 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 03:16:48 +01:00
Denys Vlasenko
f4f10720fe bc: fixed from 64-bit compile 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-18 02:23:53 +01:00
Denys Vlasenko
4b72aebe80 bc: remove "error after expression parsing" check 
It is misplaced: caller knows better what can or cannot follow the expression.
Sometimes even caller's caller: "if (1) return a+b else..." -
parser of "return" does not know that "else" after it is valid,
parser of stmt does not know it either, - only parser of
"if" knows it!

The removed code balked on e.g. "{ print 1 }" statement.

This does not break any valid programs, but starts accepting some
invalid ones, e.g. "print 1 print 2" would work.

function                                             old     new   delta
zcommon_parse_expr                                    40      32      -8
zbc_parse_name                                       509     494     -15
zbc_parse_stmt_possibly_auto                        1678    1638     -40
bc_parse_expr_empty_ok                              2025    1977     -48
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/4 up/down: 0/-111)           Total: -111 bytes
   text	   data	    bss	    dec	    hex	filename
 981599	    485	   7296	 989380	  f18c4	busybox_old
 981488	    485	   7296	 989269	  f1855	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-17 17:00:29 +01:00
Denys Vlasenko
b44a7f1d66 bc: tighten up input NUL handling 
function                                             old     new   delta
static.dc_lex_tokens                                   -      90     +90
bc_error_bad_character                                17      31     +14
static.dc_lex_regs                                     -      13     +13
bc_read_line                                         406     410      +4
bc_program_index                                      64      66      +2
dc_lex_regs                                           13       -     -13
zdc_parse_expr                                       671     656     -15
zbc_lex_next                                        2318    2230     -88
dc_lex_tokens                                         91       -     -91
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 3/2 up/down: 123/-207)          Total: -84 bytes
   text	   data	    bss	    dec	    hex	filename
 981667	    485	   7296	 989448	  f1908	busybox_old
 981599	    485	   7296	 989380	  f18c4	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-17 11:58:20 +01:00
Denys Vlasenko
e42cc19b51 bc: simplify zdc_parse_string() 
function                                             old     new   delta
bc_program_index                                      64      66      +2
zdc_parse_expr                                       671     656     -15
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 2/-15)             Total: -13 bytes
   text	   data	    bss	    dec	    hex	filename
 981667	    485	   7296	 989448	  f1908	busybox_old
 981655	    485	   7296	 989436	  f18fc	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-17 11:02:26 +01:00
Denys Vlasenko
59d4ce935e bc: use common strings 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-17 10:42:31 +01:00
Denys Vlasenko
ec60318f15 bc: tidy up "z-function" macro machinery 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-17 10:34:02 +01:00
Denys Vlasenko
e4ba4c4371 bc: parse file arguments piecemeal (do not read entire file) 
function                                             old     new   delta
bc_read_line                                         336     406     +70
zbc_vm_execute_FILE                                    -      67     +67
zbc_lex_next                                        2309    2318      +9
zbc_program_exec                                    4002    4008      +6
bc_program_index                                      66      64      -2
bc_vm_run                                            139     124     -15
zbc_vm_file                                          208      32    -176
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 3/3 up/down: 152/-193)          Total: -41 bytes
   text	   data	    bss	    dec	    hex	filename
 981736	    485	   7296	 989517	  f194d	busybox_old
 981667	    485	   7296	 989448	  f1908	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-17 09:51:43 +01:00
Denys Vlasenko
c5774a3458 bc: move fflush to the _actual_ execution loop 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-17 01:22:53 +01:00
Denys Vlasenko
51b22b1bce bc: fix typo: defone -> define 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-17 00:15:35 +01:00
Denys Vlasenko
94f72a387c bc: factor out common code 
function                                             old     new   delta
zbc_parse_stmt_allow_NLINE_before                      -      59     +59
bc_parse_pushJUMP_ZERO                                 -      27     +27
bc_parse_pushJUMP                                      -      27     +27
rewrite_label_to_current                               -      19     +19
zbc_vm_process                                       594     599      +5
zbc_lex_next_and_skip_NLINE                           22       -     -22
zbc_parse_stmt_fail_if_bare_NLINE                     28       -     -28
zbc_parse_stmt_possibly_auto                        1909    1678    -231
------------------------------------------------------------------------------
(add/remove: 4/2 grow/shrink: 1/1 up/down: 137/-281)         Total: -144 bytes
   text	   data	    bss	    dec	    hex	filename
 981879	    485	   7296	 989660	  f19dc	busybox_old
 981755	    485	   7296	 989536	  f1960	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-17 00:07:48 +01:00
Denys Vlasenko
5ebd2a6128 bc: remove use of "BcInstPtr ip" object from loop parsing 
function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        1964    1909     -55
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-55)             Total: -55 bytes
   text	   data	    bss	    dec	    hex	filename
 981934	    485	   7296	 989715	  f1a13	busybox_old
 981879	    485	   7296	 989660	  f19dc	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 23:35:04 +01:00
Denys Vlasenko
266aa00012 bc: store only index in p->exits, it's the only thing used there 
function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        1967    1964      -3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-3)               Total: -3 bytes
   text	   data	    bss	    dec	    hex	filename
 981937	    485	   7296	 989718	  f1a16	busybox_old
 981934	    485	   7296	 989715	  f1a13	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 23:24:25 +01:00
Denys Vlasenko
8e7686e457 bc: p->exits.func is never zero, do not check for that 
function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        1978    1967     -11
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-11)             Total: -11 bytes
   text	   data	    bss	    dec	    hex	filename
 981948	    485	   7296	 989729	  f1a21	busybox_old
 981937	    485	   7296	 989718	  f1a16	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 23:18:28 +01:00
Denys Vlasenko
de24e9d366 bc: remove redundant JUMP generation when parsing 'while' 
function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        2065    2025     -40
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-40)             Total: -40 bytes
   text	   data	    bss	    dec	    hex	filename
 982035	    485	   7296	 989816	  f1a78	busybox_old
 981995	    485	   7296	 989776	  f1a50	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 23:02:22 +01:00
Denys Vlasenko
06ade77002 bc: simplify use of "ip" in loop parsing functions 
function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        2106    2065     -41
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-41)             Total: -41 bytes
   text	   data	    bss	    dec	    hex	filename
 982076	    485	   7296	 989857	  f1aa1	busybox_old
 982035	    485	   7296	 989816	  f1a78	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 22:44:51 +01:00
Denys Vlasenko
146a79d19c bc: shring bc_lib[] 
function                                             old     new   delta
bc_lib                                              1586    1584      -2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 21:46:11 +01:00
Denys Vlasenko
15850832be bc: shrink zbc_parse_if() a bit more 
function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        2180    2106     -74
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-74)             Total: -74 bytes
   text	   data	    bss	    dec	    hex	filename
 982152	    485	   7296	 989933	  f1aed	busybox_old
 982078	    485	   7296	 989859	  f1aa3	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 21:41:17 +01:00
Denys Vlasenko
6b5b46f817 bc: stop using p->exits when parsing if() 
function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        2180    2138     -42

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 21:29:08 +01:00
Denys Vlasenko
7415633128 bc: preparation to stop using p->exits when parsing if() 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 21:21:27 +01:00
Denys Vlasenko
5d18f6be90 bc: fix "print 1,2,3" parsing 
function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        2245    2180     -65
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-65)             Total: -65 bytes
   text	   data	    bss	    dec	    hex	filename
 982237	    485	   7296	 990018	  f1b42	busybox_old
 982152	    485	   7296	 989933	  f1aed	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 21:08:30 +01:00
Denys Vlasenko
cb18b546f7 bc: disallow empty statement as function body 
$ bc
	define z() <cr>
	<cr>
	bc: no statement after 'define'

function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        2239    2245      +6
zbc_vm_process                                       589     594      +5
zbc_parse_stmt_fail_if_bare_NLINE                     25      28      +3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 14/0)               Total: 14 bytes
   text	   data	    bss	    dec	    hex	filename
 982216	    485	   7296	 989997	  f1b2d	busybox_old
 982237	    485	   7296	 990018	  f1b42	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 20:46:15 +01:00
Denys Vlasenko
2e8be023cb bc: allow only one <newline> between if() and stmt 
Attempt to have more than one causes this error message:

	$ bc -q
	if (1)<cr>
	<cr>
	bc: no statement after 'if'

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 20:41:32 +01:00
Denys Vlasenko
e6c40c48d9 bc: simplify bc_parse_pushName(), do not free name in it - avoids one strdup 
function                                             old     new   delta
zbc_parse_name                                       511     509      -2
zdc_parse_register                                    50      43      -7
bc_parse_pushName                                     61      39     -22
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-31)             Total: -31 bytes
   text	   data	    bss	    dec	    hex	filename
 982183	    485	   7296	 989964	  f1b0c	busybox_old
 982152	    485	   7296	 989933	  f1aed	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 20:32:58 +01:00
Denys Vlasenko
563d93c9a4 bc: simplify zbc_parse_break_or_continue(), logic is the same 
function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        2259    2224     -35
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-35)             Total: -35 bytes
   text	   data	    bss	    dec	    hex	filename
 982218	    485	   7296	 989999	  f1b2f	busybox_old
 982183	    485	   7296	 989964	  f1b0c	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 19:47:40 +01:00
Denys Vlasenko
a50576a415 bc: fold zbc_parse_else() into its only caller 
While at it, allow newline between "else" and its body

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 19:21:57 +01:00
Denys Vlasenko
6d29879c67 bc: fold bc_parse_noElse() into its only caller 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 19:10:38 +01:00
Denys Vlasenko
9dc5d08baa bc: delete unused (write-only) BcParse::nbraces member 
function                                             old     new   delta
zbc_lex_next                                        2296    2309     +13
bc_parse_expr_empty_ok                              2021    2025      +4
bc_vm_init                                           760     757      -3
bc_num_printNewline                                   54      51      -3
zbc_num_divmod                                       156     150      -6
bc_parse_reset                                       113     106      -7
zbc_lex_number                                       200     192      -8
bc_parse_number                                       83      66     -17
zdc_parse_expr                                       707     671     -36
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/7 up/down: 17/-80)            Total: -63 bytes
   text	   data	    bss	    dec	    hex	filename
 982275	    485	   7296	 990056	  f1b68	busybox_old
 982212	    485	   7296	 989993	  f1b29	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 18:43:51 +01:00
Denys Vlasenko
202dd1943c bc: fixes for multi-line if/while/for 
function                                             old     new   delta
zbc_vm_process                                       561     589     +28
zbc_lex_next_and_skip_NLINE                            -      22     +22
zbc_parse_stmt_possibly_auto                        2232    2253     +21
zbc_lex_skip_if_at_NLINE                               -      14     +14
zbc_lex_number                                       192     200      +8
zbc_num_divmod                                       150     156      +6
bc_vm_run                                            134     139      +5
bc_vm_init                                           757     760      +3
bc_num_printNewline                                   51      54      +3
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 7/0 up/down: 110/0)             Total: 110 bytes
   text	   data	    bss	    dec	    hex	filename
 982138	    485	   7296	 989919	  f1adf	busybox_old
 982275	    485	   7296	 990056	  f1b68	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 17:30:35 +01:00
Denys Vlasenko
e9519e44a6 bc: fix handling of 'return' not in functions, and 'define f()<newline>{...}' 
function                                             old     new   delta
zbc_vm_process                                       561     597     +36
zbc_parse_stmt_possibly_auto                        2232    2253     +21
zbc_lex_number                                       192     200      +8
zbc_num_divmod                                       150     156      +6
bc_vm_run                                            134     139      +5
bc_vm_init                                           757     760      +3
bc_num_printNewline                                   51      54      +3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 7/0 up/down: 82/0)               Total: 82 bytes
   text	   data	    bss	    dec	    hex	filename
 982138	    485	   7296	 989919	  f1adf	busybox_old
 982247	    485	   7296	 990028	  f1b4c	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 17:06:07 +01:00
Denys Vlasenko
d1d29b4245 bc: partially rewrite parser, tests pass, ^C might be broken now 
The entire control construct (if/while/for/funcdef) or {} block is
"eaten" by the corresponding parsing function, instead of maintaining
special "block flag stack" with magic bits in it, and returning to main
input loop after every inner statement (every input line, essentially).

This required moving line input deep into lexer - now zbc_lex_next()
triggers more reading when needed.

"block flag stack" is gone.

Correctness of ^C handling wasn't checked, might need fixing now.

if/else syntax is changed to match GNU bc: "else" can not be on
the next line (the rationale is that "if (1) 2" statement in interactive
mode should execute and print 2 instead of waiting for possible
"else ..." line).

This change fixes the following examples:

if (1) if (1) 1 else 2 else 3

if (0) 1 else if (1) 2

define w() { auto z; return 1; }

function                                             old     new   delta
zbc_parse_stmt_possibly_auto                           -    2232   +2232
zbc_vm_process                                        89     561    +472
zbc_lex_next                                        1982    2296    +314
bc_vm_init                                           749     757      +8
bc_parse_expr_empty_ok                              2016    2021      +5
bc_num_printNewline                                   54      51      -3
zbc_program_read                                     289     280      -9
bc_parse_free                                         47      38      -9
bc_parse_reset                                       126     113     -13
bc_parse_create                                      108      92     -16
bc_parse_push_block_flag                              47       -     -47
bc_parse_noElse                                       48       -     -48
zbc_parse_text_init                                  113      59     -54
zbc_parse_body                                       121       -    -121
zbc_parse_else                                       125       -    -125
zbc_parse_endBody                                    254       -    -254
bc_vm_run                                            421     134    -287
zbc_parse_auto                                       290       -    -290
zcommon_parse                                        476       -    -476
zbc_parse_stmt                                      1682       7   -1675
------------------------------------------------------------------------------
(add/remove: 1/7 grow/shrink: 4/8 up/down: 3031/-3427)       Total: -396 bytes
   text	   data	    bss	    dec	    hex	filename
 982586	    485	   7296	 990367	  f1c9f	busybox_old
 982138	    485	   7296	 989919	  f1adf	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2018-12-16 16:10:38 +01:00