oweals/busybox.git
5 years agobc: reduce indentation, no code changes
Denys Vlasenko [Wed, 26 Dec 2018 18:24:15 +0000 (19:24 +0100)]
bc: reduce indentation, no code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix "bc only" build
Denys Vlasenko [Wed, 26 Dec 2018 18:09:23 +0000 (19:09 +0100)]
bc: fix "bc only" build

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix "dc only" build
Denys Vlasenko [Wed, 26 Dec 2018 18:06:05 +0000 (19:06 +0100)]
bc: fix "dc only" build

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: comment out code which appears to be never reached
Denys Vlasenko [Wed, 26 Dec 2018 17:59:42 +0000 (18:59 +0100)]
bc: comment out code which appears to be never reached

function                                             old     new   delta
zbc_lex_next                                        1587    1568     -19

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: remove all logic for multi-line buffering
Denys Vlasenko [Wed, 26 Dec 2018 17:46:03 +0000 (18:46 +0100)]
bc: remove all logic for multi-line buffering

function                                             old     new   delta
zbc_vm_process                                       865     874      +9
zbc_parse_text_init                                   51      38     -13
bc_read_line                                         394     345     -49
peek_inbuf                                           292      69    -223
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/3 up/down: 9/-285)           Total: -276 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: prepare for char-by-char input handling
Denys Vlasenko [Wed, 26 Dec 2018 17:32:43 +0000 (18:32 +0100)]
bc: prepare for char-by-char input handling

function                                             old     new   delta
peek_inbuf                                             -     292    +292
parse_lex_by_checking_eq_sign                          -      26     +26
eat_inbuf                                              -      22     +22
zbc_vm_execute_FILE                                   52      61      +9
bc_lex_lineComment                                    29      30      +1
zbc_lex_number                                       174     172      -2
bc_vm_run                                            104      99      -5
zbc_num_divmod                                       156     150      -6
bc_lex_file                                           24       -     -24
bc_lex_assign                                         26       -     -26
zbc_lex_next                                        1982    1587    -395
------------------------------------------------------------------------------
(add/remove: 3/2 grow/shrink: 2/4 up/down: 350/-458)         Total: -108 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix handling of comment/string interactions while buffering input
Denys Vlasenko [Wed, 26 Dec 2018 11:23:05 +0000 (12:23 +0100)]
bc: fix handling of comment/string interactions while buffering input

function                                             old     new   delta
zbc_lex_next                                        1965    1982     +17
zbc_num_divmod                                       150     156      +6
bc_read_line                                         411     394     -17
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 23/-17)              Total: 6 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix interactive handling of comments in strings and quotes in comments
Denys Vlasenko [Tue, 25 Dec 2018 22:45:57 +0000 (23:45 +0100)]
bc: fix interactive handling of comments in strings and quotes in comments

function                                             old     new   delta
zbc_lex_next                                        1965    1979     +14

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: simplify input pointer manipulation while lexing
Denys Vlasenko [Tue, 25 Dec 2018 22:15:59 +0000 (23:15 +0100)]
bc: simplify input pointer manipulation while lexing

function                                             old     new   delta
bc_lex_name                                           70      68      -2
zbc_lex_number                                       177     174      -3
bc_vm_init                                           679     676      -3
bc_lex_whitespace                                     42      39      -3
zbc_parse_text_init                                   55      51      -4
bc_lex_lineComment                                    37      29      -8
bc_lex_assign                                         34      26      -8
zbc_lex_next                                        2039    1965     -74
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/8 up/down: 0/-105)           Total: -105 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fold struct BcLex into BcParse
Denys Vlasenko [Tue, 25 Dec 2018 21:32:41 +0000 (22:32 +0100)]
bc: fold struct BcLex into BcParse

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: move BcLex::lex member to be the first in struct globals
Denys Vlasenko [Tue, 25 Dec 2018 21:20:14 +0000 (22:20 +0100)]
bc: move BcLex::lex member to be the first in struct globals

function                                             old     new   delta
zbc_program_exec                                    3967    4003     +36
zdc_program_execStr                                  501     520     +19
zbc_posix_error_fmt                                   58      62      +4
bc_vm_init                                           675     679      +4
bc_read_line                                         407     411      +4
bc_error_fmt                                          36      40      +4
zdc_parse_register                                    45      44      -1
zdc_parse_exprs_until_eof                             28      27      -1
zbc_parse_text_init                                   56      55      -1
zbc_parse_stmt_allow_NLINE_before                     55      54      -1
zbc_lex_skip_if_at_NLINE                              19      18      -1
zbc_lex_number                                       178     177      -1
bc_parse_create                                       97      96      -1
bc_lex_whitespace                                     43      42      -1
bc_lex_name                                           71      70      -1
bc_lex_lineComment                                    38      37      -1
bc_lex_assign                                         35      34      -1
zdc_parse_expr                                       476     473      -3
bc_verror_msg                                         93      90      -3
bc_lex_file                                           27      24      -3
zbc_parse_name                                       453     448      -5
bc_parse_expr_empty_ok                              1776    1764     -12
zbc_vm_process                                       878     865     -13
zbc_parse_stmt_possibly_auto                        1451    1425     -26
zbc_lex_next                                        2075    2039     -36
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 6/19 up/down: 71/-112)          Total: -41 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename some members and macros, no code changes
Denys Vlasenko [Tue, 25 Dec 2018 20:44:10 +0000 (21:44 +0100)]
bc: rename some members and macros, no code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shorten error messages
Denys Vlasenko [Tue, 25 Dec 2018 20:28:25 +0000 (21:28 +0100)]
bc: shorten error messages

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: make it clear that the code is adapted
Gavin Howard [Tue, 18 Dec 2018 17:03:14 +0000 (10:03 -0700)]
bc: make it clear that the code is adapted

Signed-off-by: Gavin Howard <yzena.tech@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agodc: add two tests
Denys Vlasenko [Tue, 25 Dec 2018 19:50:41 +0000 (20:50 +0100)]
dc: add two tests

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: stop passing a pointer to G.prs down the call chain
Denys Vlasenko [Tue, 25 Dec 2018 19:40:55 +0000 (20:40 +0100)]
bc: stop passing a pointer to G.prs down the call chain

function                                             old     new   delta
rewrite_label_to_current                              19      26      +7
bc_lex_assign                                         28      35      +7
zbc_lex_skip_if_at_NLINE                              14      19      +5
bc_parse_push                                         11      16      +5
bc_parse_operator                                    147     152      +5
bc_parse_create                                       92      97      +5
bc_lex_whitespace                                     38      43      +5
bc_lex_name                                           66      71      +5
bc_lex_lineComment                                    33      38      +5
zbc_lex_number                                       174     178      +4
zbc_parse_text_init                                   53      56      +3
zdc_parse_register                                    43      45      +2
zdc_parse_exprs_until_eof                             26      28      +2
bc_parse_free                                         38      40      +2
bc_lex_file                                           28      27      -1
zbc_parse_pushSTR                                     65      63      -2
bc_parse_expr_empty_ok                              1778    1776      -2
zbc_vm_execute_FILE                                   55      52      -3
bc_vm_init                                           678     675      -3
zbc_parse_stmt_allow_NLINE_before                     59      55      -4
bc_parse_pushNUM                                      80      74      -6
bc_parse_pushJUMP_ZERO                                27      21      -6
bc_parse_pushJUMP                                     27      21      -6
bc_vm_run                                            112     104      -8
bc_parse_pushName                                     39      31      -8
bc_parse_pushIndex                                    60      52      -8
zbc_parse_name                                       468     453     -15
zdc_program_execStr                                  524     501     -23
zdc_parse_mem                                         93      70     -23
zbc_program_exec                                    4003    3967     -36
zdc_parse_expr                                       518     476     -42
zbc_vm_process                                       923     878     -45
zbc_lex_next                                        2158    2070     -88
zbc_parse_stmt_possibly_auto                        1560    1451    -109
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 14/20 up/down: 62/-438)        Total: -376 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: make zbc_program_read() and zdc_program_execStr() use G.prs
Denys Vlasenko [Tue, 25 Dec 2018 18:38:13 +0000 (19:38 +0100)]
bc: make zbc_program_read() and zdc_program_execStr() use G.prs

function                                             old     new   delta
zbc_program_print                                    656     683     +27
zbc_program_exec                                    3976    4003     +27
zdc_program_execStr                                  512     524     +12
bc_num_printNewline                                   45      54      +9
bc_num_printHex                                       61      67      +6
bc_num_printDigits                                   131     137      +6
dc_num_printChar                                      21      24      +3
bc_vm_init                                           675     678      +3
zbc_program_assign                                   424     426      +2
bc_read_line                                         410     407      -3
bc_verror_msg                                         99      93      -6
zbc_lex_next                                        2167    2158      -9
zbc_vm_execute_FILE                                   67      55     -12
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 9/4 up/down: 95/-30)             Total: 65 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix interactive read()
Denys Vlasenko [Tue, 25 Dec 2018 18:37:23 +0000 (19:37 +0100)]
bc: fix interactive read()

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: add code to detect errors like "print 1 print 2"
Denys Vlasenko [Tue, 25 Dec 2018 17:37:52 +0000 (18:37 +0100)]
bc: add code to detect errors like "print 1 print 2"

function                                             old     new   delta
zbc_vm_process                                       831     925     +94
zbc_program_exec                                    3964    3976     +12
zdc_program_execStr                                  506     512      +6
zbc_lex_next                                        2161    2167      +6
zbc_program_assign                                   419     424      +5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 5/0 up/down: 123/0)             Total: 123 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: allow {break} and {continue} (allow RBRACE to terminate them)
Denys Vlasenko [Tue, 25 Dec 2018 16:07:51 +0000 (17:07 +0100)]
bc: allow {break} and {continue} (allow RBRACE to terminate them)

function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        1599    1560     -39

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shrink parsing code a bit more, disallow "auto a b c" (without commas)
Denys Vlasenko [Tue, 25 Dec 2018 15:39:01 +0000 (16:39 +0100)]
bc: shrink parsing code a bit more, disallow "auto a b c" (without commas)

function                                             old     new   delta
bc_parse_expr_empty_ok                              1791    1785      -6
zbc_parse_stmt_possibly_auto                        1675    1599     -76
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-82)             Total: -82 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: simplify bc_parse_expr_empty_ok()
Denys Vlasenko [Tue, 25 Dec 2018 00:43:52 +0000 (01:43 +0100)]
bc: simplify bc_parse_expr_empty_ok()

function                                             old     new   delta
bc_parse_expr_empty_ok                              1810    1791     -19

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: simplify bc_parse_expr_empty_ok()
Denys Vlasenko [Tue, 25 Dec 2018 00:21:16 +0000 (01:21 +0100)]
bc: simplify bc_parse_expr_empty_ok()

function                                             old     new   delta
bc_parse_expr_empty_ok                              1819    1810      -9

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: simplify bc_parse_expr_empty_ok()
Denys Vlasenko [Tue, 25 Dec 2018 00:16:37 +0000 (01:16 +0100)]
bc: simplify bc_parse_expr_empty_ok()

function                                             old     new   delta
bc_parse_expr_empty_ok                              1846    1819     -27

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: BC_RESULT_ONE is bc-specific
Denys Vlasenko [Mon, 24 Dec 2018 22:41:31 +0000 (23:41 +0100)]
bc: BC_RESULT_ONE is bc-specific

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: partially deinline BC_PARSE_LEAF() macro
Denys Vlasenko [Mon, 24 Dec 2018 22:22:40 +0000 (23:22 +0100)]
bc: partially deinline BC_PARSE_LEAF() macro

function                                             old     new   delta
ok_in_expr                                             -      30     +30
bc_parse_expr_empty_ok                              1972    1846    -126
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/1 up/down: 30/-126)           Total: -96 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename lexer variables, use smallints where appropriate
Denys Vlasenko [Mon, 24 Dec 2018 21:55:54 +0000 (22:55 +0100)]
bc: rename lexer variables, use smallints where appropriate

function                                             old     new   delta
bc_parse_expr_empty_ok                              1966    1972      +6
zdc_parse_expr                                       514     518      +4
zbc_lex_number                                       177     174      -3
dc_num_printChar                                      24      21      -3
bc_lex_whitespace                                     41      38      -3
bc_lex_name                                           69      66      -3
bc_lex_lineComment                                    36      33      -3
bc_lex_assign                                         31      28      -3
zbc_parse_name                                       472     468      -4
zbc_vm_process                                       836     831      -5
zdc_program_execStr                                  512     506      -6
zbc_parse_text_init                                   59      53      -6
bc_num_printNewline                                   51      45      -6
bc_num_printHex                                       67      61      -6
bc_num_printDigits                                   137     131      -6
zbc_program_assign                                   426     419      -7
zbc_parse_stmt_possibly_auto                        1682    1675      -7
zbc_program_exec                                    3977    3964     -13
zbc_program_print                                    683     656     -27
zbc_lex_next                                        2233    2161     -72
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/18 up/down: 10/-183)         Total: -173 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix "bc -s" only warning on "define f()<newline>", not exiting
Denys Vlasenko [Mon, 24 Dec 2018 17:28:56 +0000 (18:28 +0100)]
bc: fix "bc -s" only warning on "define f()<newline>", not exiting

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: POSIX error/warn functions can be 'z' functions too
Denys Vlasenko [Mon, 24 Dec 2018 17:11:41 +0000 (18:11 +0100)]
bc: POSIX error/warn functions can be 'z' functions too

In non-interactive config, they either return 'success', or do not return.

function                                             old     new   delta
zbc_posix_error_fmt                                   41      39      -2
bc_parse_expr_empty_ok                              1751    1744      -7
zbc_parse_stmt_possibly_auto                        1322    1314      -8
------------------------------------------------------------------------------
(add/remove: 5/5 grow/shrink: 0/2 up/down: 118/-135)          Total: -17 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: remove unnecessary NULL initializers
Denys Vlasenko [Mon, 24 Dec 2018 16:15:34 +0000 (17:15 +0100)]
bc: remove unnecessary NULL initializers

function                                             old     new   delta
zbc_program_assign                                   442     426     -16
zbc_program_exec                                    4043    3977     -66
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-82)             Total: -82 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: move relational LEXs before math LEXs - shorten dc_LEX_to_INST[]
Denys Vlasenko [Mon, 24 Dec 2018 16:06:37 +0000 (17:06 +0100)]
bc: move relational LEXs before math LEXs - shorten dc_LEX_to_INST[]

function                                             old     new   delta
dc_LEX_to_INST                                        48      42      -6
zdc_parse_expr                                       523     514      -9
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-15)             Total: -15 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: offset dc_LEX_to_INST[] start
Denys Vlasenko [Mon, 24 Dec 2018 14:29:08 +0000 (15:29 +0100)]
bc: offset dc_LEX_to_INST[] start

function                                             old     new   delta
zdc_parse_expr                                       516     523      +7
dc_LEX_to_INST                                        56      48      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 7/-8)               Total: -1 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename BC_LEX_NLINE/WHITESPACE/STR/NAME/NUMBER to XC_LEX_
Denys Vlasenko [Mon, 24 Dec 2018 14:05:49 +0000 (15:05 +0100)]
bc: rename  BC_LEX_NLINE/WHITESPACE/STR/NAME/NUMBER to XC_LEX_

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: separate many bc and dc LEX constants
Denys Vlasenko [Mon, 24 Dec 2018 14:00:56 +0000 (15:00 +0100)]
bc: separate many bc and dc LEX constants

function                                             old     new   delta
zdc_parse_expr                                       510     516      +6
bc_parse_expr_empty_ok                              1963    1966      +3
dc_LEX_to_INST                                        83      56     -27
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 9/-27)             Total: -18 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename several BC_LEX_OPs to XC_LEX_OPs.
Denys Vlasenko [Mon, 24 Dec 2018 13:14:23 +0000 (14:14 +0100)]
bc: rename several BC_LEX_OPs to XC_LEX_OPs.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: move BC_LEX_OP_INC/DEC to the end of operation LEX constants
Denys Vlasenko [Mon, 24 Dec 2018 12:20:57 +0000 (13:20 +0100)]
bc: move BC_LEX_OP_INC/DEC to the end of operation LEX constants

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename BC_LEXs to XC_LEXs for common constants, and to DC_LEXs for dc-specific
Denys Vlasenko [Mon, 24 Dec 2018 11:25:20 +0000 (12:25 +0100)]
bc: rename BC_LEXs to XC_LEXs for common constants, and to DC_LEXs for dc-specific

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: move functions/macros around, no code changes
Denys Vlasenko [Mon, 24 Dec 2018 04:00:36 +0000 (05:00 +0100)]
bc: move functions/macros around, no code changes

Order now is:
enums/structures/defines,
utility/common functions,
parsing,
execution,
main loop,
main()

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename common INST constants to XC_, dc-specific ones to DC_
Denys Vlasenko [Mon, 24 Dec 2018 03:26:07 +0000 (04:26 +0100)]
bc: rename common INST constants to XC_, dc-specific ones to DC_

This will assist in disentangling dc and bc LEX constants

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agodc: without -x, do not parse extended regs: 's p' means: store to ' ' reg, print
Denys Vlasenko [Mon, 24 Dec 2018 00:53:55 +0000 (01:53 +0100)]
dc: without -x, do not parse extended regs: 's p' means: store to ' ' reg, print

function                                             old     new   delta
zbc_lex_next                                        2240    2233      -7
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-7)               Total: -7 bytes
   text    data     bss     dec     hex filename
 981437     485    7296  989218   f1822 busybox_old
 981412     485    7296  989193   f1809 busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix incorrect bit in BC_PARSE_EXPRS_BITS: 'limits' is not allowed
Denys Vlasenko [Mon, 24 Dec 2018 00:02:59 +0000 (01:02 +0100)]
bc: fix incorrect bit in BC_PARSE_EXPRS_BITS: 'limits' is not allowed

Alsl, move and rename dc_lex_tokens[] to dc_char_to_LEX[]

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: for "dc only" remove handling of LAST, move OBASE enums up to IBASE
Denys Vlasenko [Sun, 23 Dec 2018 23:50:32 +0000 (00:50 +0100)]
bc: for "dc only" remove handling of LAST, move OBASE enums up to IBASE

function                                             old     new   delta
dc_LEX_to_INST                                         -      82     +82
bc_parse_pushNUM                                       -      62     +62
zbc_program_num                                      981     978      -3
bc_result_free                                        46      43      -3
zbc_program_binOpPrep                                305     300      -5
static.msg                                            24      12     -12
zbc_program_exec                                    4013    3994     -19
zdc_parse_expr                                       583     507     -76
dc_parse_insts                                        83       -     -83
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 0/6 up/down: 144/-201)          Total: -57 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix empty lines in dc generating "bad token" message
Denys Vlasenko [Sat, 22 Dec 2018 23:13:15 +0000 (00:13 +0100)]
bc: fix empty lines in dc generating "bad token" message

function                                             old     new   delta
zdc_program_asciify                                    -     370    +370
zbc_program_pushArray                                  -     147    +147
zbc_vm_process                                       824     828      +4
zbc_program_exec                                    4182    4046    -136
zdc_program_printStream                              146       -    -146
zbc_program_read                                     268       -    -268
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 1/1 up/down: 521/-550)          Total: -29 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shrink modular exponentiation code
Denys Vlasenko [Sat, 22 Dec 2018 22:59:21 +0000 (23:59 +0100)]
bc: shrink modular exponentiation code

function                                             old     new   delta
zdc_program_modexp                                   721     694     -27

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: do not yet allow 2^2.1
Denys Vlasenko [Sat, 22 Dec 2018 22:14:48 +0000 (23:14 +0100)]
bc: do not yet allow 2^2.1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: avoid having to twiddle b->neg in zbc_num_p()
Denys Vlasenko [Sat, 22 Dec 2018 20:52:30 +0000 (21:52 +0100)]
bc: avoid having to twiddle b->neg in zbc_num_p()

function                                             old     new   delta
zbc_num_ulong_abs                                      -      70     +70
zbc_num_p                                            424     413     -11
zbc_num_ulong                                         81      21     -60
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/2 up/down: 70/-71)             Total: -1 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: do not disallow powers to N.0000 degree - it's even shorter code
Denys Vlasenko [Sat, 22 Dec 2018 20:45:18 +0000 (21:45 +0100)]
bc: do not disallow powers to N.0000 degree - it's even shorter code

function                                             old     new   delta
zbc_num_p                                            440     424     -16

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shrink zbc_num_ulong()
Denys Vlasenko [Sat, 22 Dec 2018 20:37:46 +0000 (21:37 +0100)]
bc: shrink zbc_num_ulong()

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: make long-running dc drop data it does not need (when it can)
Denys Vlasenko [Sat, 22 Dec 2018 18:23:46 +0000 (19:23 +0100)]
bc: make long-running dc drop data it does not need (when it can)

function                                             old     new   delta
zbc_vm_process                                       765     824     +59

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: unbreak "z function" macro machinery
Denys Vlasenko [Sat, 22 Dec 2018 17:24:19 +0000 (18:24 +0100)]
bc: unbreak "z function" macro machinery

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agodc: unbreak interactive mode - was trying to get next tokens instead of executing
Denys Vlasenko [Sat, 22 Dec 2018 17:04:08 +0000 (18:04 +0100)]
dc: unbreak interactive mode - was trying to get next tokens instead of executing

function                                             old     new   delta
zbc_program_read                                       -     268    +268
zdc_program_printStream                                -     146    +146
zbc_program_exec                                    4046    4182    +136
zdc_program_execStr                                  472     512     +40
zdc_parse_exprs_until_eof                              -      26     +26
zbc_vm_process                                       740     765     +25
zbc_lex_next                                        2225    2240     +15
zdc_parse_expr                                       569     535     -34
zbc_program_pushArray                                147       -    -147
zdc_program_asciify                                  370       -    -370
------------------------------------------------------------------------------
(add/remove: 3/2 grow/shrink: 4/1 up/down: 656/-551)          Total: 105 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: move zbc_lex_next() out of zdc_parse_string() and zdc_parse_mem()
Denys Vlasenko [Sat, 22 Dec 2018 15:40:38 +0000 (16:40 +0100)]
bc: move zbc_lex_next() out of zdc_parse_string() and zdc_parse_mem()

function                                             old     new   delta
zdc_parse_mem                                         99      93      -6
zdc_parse_expr                                       586     569     -17
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-23)             Total: -23 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shorten sanity-check code
Denys Vlasenko [Sat, 22 Dec 2018 13:18:47 +0000 (14:18 +0100)]
bc: shorten sanity-check code

function                                             old     new   delta
zbc_vm_process                                       745     740      -5

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fold single-callsite functions into callers, commonalize code
Denys Vlasenko [Sat, 22 Dec 2018 05:00:25 +0000 (06:00 +0100)]
bc: fold single-callsite functions into callers, commonalize code

function                                             old     new   delta
zbc_vm_process                                       699     745     +46
zbc_parse_stmt_possibly_auto                        1689    1682      -7
bc_parse_reset                                       113       -    -113
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/1 up/down: 46/-120)           Total: -74 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: zcommon_parse_expr() has only one user, fold it in
Denys Vlasenko [Sat, 22 Dec 2018 02:38:52 +0000 (03:38 +0100)]
bc: zcommon_parse_expr() has only one user, fold it in

function                                             old     new   delta
zbc_program_exec                                    4021    4046     +25
zdc_parse_expr                                       589     586      -3
zcommon_parse_expr                                    28       -     -28
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/1 up/down: 25/-31)             Total: -6 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: zcommon_parse_expr() lost its flags argument
Denys Vlasenko [Sat, 22 Dec 2018 01:30:18 +0000 (02:30 +0100)]
bc: zcommon_parse_expr() lost its flags argument

function                                             old     new   delta
zcommon_parse_expr                                     -      28     +28
zdc_program_execStr                                  474     472      -2
zbc_program_exec                                    4023    4021      -2
common_parse_expr                                     29       -     -29
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 0/2 up/down: 28/-33)             Total: -5 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: stop using BC_PARSE_NOCALL in dc code
Denys Vlasenko [Sat, 22 Dec 2018 01:23:08 +0000 (02:23 +0100)]
bc: stop using BC_PARSE_NOCALL in dc code

function                                             old     new   delta
zdc_program_execStr                                  465     474      +9
zbc_vm_process                                       701     699      -2
common_parse_expr                                     32      29      -3
zdc_parse_expr                                       615     586     -29
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/3 up/down: 9/-34)             Total: -25 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: unbreak read(), remove checks for nested read()
Denys Vlasenko [Sat, 22 Dec 2018 00:34:10 +0000 (01:34 +0100)]
bc: unbreak read(), remove checks for nested read()

function                                             old     new   delta
zbc_parse_pushSTR                                      -      65     +65
common_parse_expr                                      -      32     +32
bc_error_nested_read_call                             10       -     -10
bc_parse_expr_empty_ok                              1977    1963     -14
zdc_parse_expr                                       635     615     -20
zcommon_parse_expr                                    32       -     -32
zbc_program_exec                                    4064    4023     -41
bc_parse_pushSTR                                      65       -     -65
------------------------------------------------------------------------------
(add/remove: 2/3 grow/shrink: 0/3 up/down: 97/-182)           Total: -85 bytes
   text    data     bss     dec     hex filename
 981661     485    7296  989442   f1902 busybox_old
 981540     485    7296  989321   f1889 busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: code shrink
Denys Vlasenko [Fri, 21 Dec 2018 22:13:48 +0000 (23:13 +0100)]
bc: code shrink

function                                             old     new   delta
bc_result_pop_and_push                                 -      73     +73
zbc_program_exec                                    4068    4064      -4
bc_program_binOpRetire                                46      32     -14
zdc_program_assignStr                                146     126     -20
zdc_program_asciify                                  395     370     -25
bc_program_retire                                     35       7     -28
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/5 up/down: 73/-91)            Total: -18 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename BcInstPtr::idx and ::len
Denys Vlasenko [Fri, 21 Dec 2018 22:01:26 +0000 (23:01 +0100)]
bc: rename BcInstPtr::idx and ::len

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: remove unnecessary initializations
Denys Vlasenko [Fri, 21 Dec 2018 21:43:53 +0000 (22:43 +0100)]
bc: remove unnecessary initializations

function                                             old     new   delta
zdc_program_asciify                                  403     395      -8
zbc_program_print                                    691     683      -8
zbc_program_exec                                    4079    4068     -11
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-27)             Total: -27 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: use non-allocated BcNum's where appropriate
Denys Vlasenko [Fri, 21 Dec 2018 21:36:04 +0000 (22:36 +0100)]
bc: use non-allocated BcNum's where appropriate

function                                             old     new   delta
zbc_num_printNum                                     540     543      +3
zdc_program_asciify                                  407     403      -4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 3/-4)               Total: -1 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: optimize bc_vec_push() usage
Denys Vlasenko [Fri, 21 Dec 2018 21:16:17 +0000 (22:16 +0100)]
bc: optimize bc_vec_push() usage

function                                             old     new   delta
bc_parse_pushNUM                                      87      80      -7
zbc_parse_stmt_possibly_auto                        1697    1689      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-15)             Total: -15 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix for() to not leave data on stack
Denys Vlasenko [Fri, 21 Dec 2018 19:29:34 +0000 (20:29 +0100)]
bc: fix for() to not leave data on stack

function                                             old     new   delta
zbc_parse_stmt_possibly_auto                        1665    1697     +32
zbc_vm_process                                       672     701     +29
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 61/0)               Total: 61 bytes
   text    data     bss     dec     hex filename
 981656     485    7296  989437   f18fd busybox_old
 981748     485    7296  989529   f1959 busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix infinite state growth for "yes 1 | bc" case
Denys Vlasenko [Fri, 21 Dec 2018 15:22:26 +0000 (16:22 +0100)]
bc: fix infinite state growth for "yes 1 | bc" case

function                                             old     new   delta
zbc_vm_process                                       585     672     +87
bc_func_init                                          50      86     +36
zbc_program_num                                      990    1022     +32
bc_program_str                                        17      47     +30
bc_program_current_func                                -      22     +22
bc_parse_pushNUM                                      66      87     +21
bc_func_free                                          27      43     +16
zbc_num_binary                                       145     147      +2
bc_program_reset                                      64      61      -3
bc_parse_pushSTR                                      73      65      -8
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 7/2 up/down: 246/-11)           Total: 235 bytes
   text    data     bss     dec     hex filename
 981393     485    7296  989174   f17f6 busybox_old
 981656     485    7296  989437   f18fd busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix comment
Denys Vlasenko [Thu, 20 Dec 2018 23:39:02 +0000 (00:39 +0100)]
bc: fix comment

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: for(;;) fix from upstream
Denys Vlasenko [Thu, 20 Dec 2018 23:35:22 +0000 (00:35 +0100)]
bc: for(;;) fix from upstream

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shrink bc_program_add_fn()
Denys Vlasenko [Thu, 20 Dec 2018 23:10:26 +0000 (00:10 +0100)]
bc: shrink bc_program_add_fn()

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: "dc only" config does not need G.prog.fn_map
Denys Vlasenko [Thu, 20 Dec 2018 19:34:09 +0000 (20:34 +0100)]
bc: "dc only" config does not need G.prog.fn_map

function                                             old     new   delta
bc_program_add_fn                                      -      43     +43
bc_vm_init                                           655     675     +20
bc_program_addFunc                                   138     118     -20
zdc_parse_expr                                       658     635     -23
zdc_program_asciify                                  447     407     -40
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/3 up/down: 63/-83)            Total: -20 bytes
   text    data     bss     dec     hex filename
 984739     489    7312  992540   f251c busybox_old
 984712     489    7312  992513   f2501 busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix keyword matching to not think "ifz" is the "if" keyword
Denys Vlasenko [Thu, 20 Dec 2018 15:48:50 +0000 (16:48 +0100)]
bc: fix keyword matching to not think "ifz" is the "if" keyword

function                                             old     new   delta
zbc_lex_next                                        2224    2225      +1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shrink "dc only" code by dropping unused structure members
Denys Vlasenko [Thu, 20 Dec 2018 15:24:18 +0000 (16:24 +0100)]
bc: shrink "dc only" code by dropping unused structure members

function                                             old     new   delta
zbc_program_num                                      979     981      +2
zbc_program_pushArray                                147     145      -2
bc_program_pushVar                                   198     196      -2
bc_program_func                                       17      15      -2
dc_num_printChar                                      24      21      -3
bc_program_retire                                     35      32      -3
bc_program_binOpRetire                                46      43      -3
zdc_program_printStream                              153     148      -5
zbc_program_prep                                      91      86      -5
zbc_program_copyToVar                                300     295      -5
zdc_program_modexp                                   721     715      -6
zbc_program_binOpPrep                                311     305      -6
bc_program_addFunc                                   138     132      -6
bc_num_printNewline                                   51      45      -6
bc_num_printHex                                       67      61      -6
bc_num_printDigits                                   137     131      -6
zdc_program_assignStr                                146     137      -9
bc_program_reset                                      64      55      -9
bc_func_free                                          27       5     -22
bc_parse_free                                         38       8     -30
bc_parse_create                                       92      47     -45
bc_func_init                                          50       5     -45
dc_main                                              691     645     -46
zdc_program_execStr                                  496     442     -54
zbc_program_print                                    677     623     -54
zbc_vm_process                                       204     137     -67
zbc_program_exec                                    4132    4057     -75
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/26 up/down: 2/-522)          Total: -520 bytes
   text    data     bss     dec     hex filename
 969767     485    7296  977548   eea8c busybox_old
 969210     485    7296  976991   ee85f busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shorten bc_program_addFunc()
Denys Vlasenko [Wed, 19 Dec 2018 19:05:50 +0000 (20:05 +0100)]
bc: shorten bc_program_addFunc()

function                                             old     new   delta
bc_func_init                                           -      50     +50
bc_program_addFunc                                   201     138     -63
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/1 up/down: 50/-63)            Total: -13 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: fix "dc only" and "bc only" configs
Denys Vlasenko [Wed, 19 Dec 2018 18:43:03 +0000 (19:43 +0100)]
bc: fix "dc only" and "bc only" configs

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename dc-specific functions, simplify zdc_program_execStr() a bit
Denys Vlasenko [Wed, 19 Dec 2018 18:35:40 +0000 (19:35 +0100)]
bc: rename dc-specific functions, simplify zdc_program_execStr() a bit

function                                             old     new   delta
zbc_program_execStr                                  496       -    -496
zdc_program_execStr                                    -     491    +491

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename zbc_parse_string->bc_parse_pushSTR, do not emit next opcode in it
Denys Vlasenko [Wed, 19 Dec 2018 18:10:40 +0000 (19:10 +0100)]
bc: rename zbc_parse_string->bc_parse_pushSTR, do not emit next opcode in it

function                                             old     new   delta
bc_parse_pushSTR                                       -      73     +73
zbc_parse_stmt_possibly_auto                        1638    1640      +2
zbc_parse_string                                      89       -     -89
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 1/0 up/down: 75/-89)            Total: -14 bytes
   text    data     bss     dec     hex filename
 981377     485    7296  989158   f17e6 busybox_old
 981363     485    7296  989144   f17d8 busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: avoid bc_vec_item() calls in bc_vm_run()
Denys Vlasenko [Wed, 19 Dec 2018 17:09:31 +0000 (18:09 +0100)]
bc: avoid bc_vec_item() calls in bc_vm_run()

function                                             old     new   delta
bc_vm_run                                            124     112     -12

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: avoid bc_vec_item() calls in bc_array_copy()
Denys Vlasenko [Wed, 19 Dec 2018 16:59:30 +0000 (17:59 +0100)]
bc: avoid bc_vec_item() calls in bc_array_copy()

function                                             old     new   delta
zbc_program_copyToVar                                311     300     -11

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: avoid successive bc_vec_item(&func->autos, i)
Denys Vlasenko [Wed, 19 Dec 2018 16:55:23 +0000 (17:55 +0100)]
bc: avoid successive bc_vec_item(&func->autos, i)

function                                             old     new   delta
zbc_func_insert                                       97     100      +3
zbc_program_call                                     353     354      +1
zbc_program_exec                                    4085    4078      -7
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 4/-7)               Total: -3 bytes
   text    data     bss     dec     hex filename
 981403     485    7296  989184   f1800 busybox_old
 981400     485    7296  989181   f17fd busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: remove unnecessary union use
Denys Vlasenko [Wed, 19 Dec 2018 16:15:04 +0000 (17:15 +0100)]
bc: remove unnecessary union use

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: "unsigned_n > 0" is shorter code than "unsigned_n >= 1"
Denys Vlasenko [Wed, 19 Dec 2018 16:09:01 +0000 (17:09 +0100)]
bc: "unsigned_n > 0" is shorter code than "unsigned_n >= 1"

function                                             old     new   delta
zbc_program_print                                    680     677      -3
zbc_program_exec                                    4089    4085      -4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-7)               Total: -7 bytes
   text    data     bss     dec     hex filename
 981404     485    7296  989185   f1801 busybox_old
 981397     485    7296  989178   f17fa busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: open-code bc_parse_updateFunc() macro
Denys Vlasenko [Wed, 19 Dec 2018 14:13:14 +0000 (15:13 +0100)]
bc: open-code bc_parse_updateFunc() macro

This clearly shows one place which would need changing
for nested funcdefs to work.

function                                             old     new   delta
bc_parse_reset                                       106     110      +4
zbc_vm_process                                       586     585      -1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 4/-1)                Total: 3 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: make bc_program_addFunc() return new idx, untangle &p->fidx interaction
Denys Vlasenko [Wed, 19 Dec 2018 13:57:23 +0000 (14:57 +0100)]
bc: make bc_program_addFunc() return new idx, untangle &p->fidx interaction

In:
       bc_program_addFunc(name, idx);
       p->func = bc_program_func(p->fidx);
in some cases p->fidx was updated by _first_ statement - because passed idx
was pointing at it. This was very obscure.

function                                             old     new   delta
zdc_parse_expr                                       653     658      +5
bc_program_addFunc                                   204     201      -3
zbc_vm_process                                       594     586      -8
bc_vm_init                                           663     655      -8
zbc_parse_name                                       482     472     -10
bc_parse_addFunc                                      25       -     -25
zbc_program_asciify                                  473     447     -26
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/5 up/down: 5/-80)             Total: -75 bytes
   text    data     bss     dec     hex filename
 981482     485    7296  989263   f184f busybox_old
 981401     485    7296  989182   f17fe busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: "reload stack only after insts" change missed a few places
Denys Vlasenko [Wed, 19 Dec 2018 13:02:59 +0000 (14:02 +0100)]
bc: "reload stack only after insts" change missed a few places

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: rename a few functions
Denys Vlasenko [Wed, 19 Dec 2018 12:55:53 +0000 (13:55 +0100)]
bc: rename a few functions

function                                             old     new   delta
bc_map_find_ge                                         -      71     +71
bc_map_find_exact                                      -      50     +50
bc_map_index                                          50       -     -50
bc_map_find                                           71       -     -71
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 0/0 up/down: 121/-121)            Total: 0 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: remove redundant strdup+free in zbc_parse_call()
Denys Vlasenko [Wed, 19 Dec 2018 12:19:44 +0000 (13:19 +0100)]
bc: remove redundant strdup+free in zbc_parse_call()

function                                             old     new   delta
zbc_parse_name                                       527     482     -45
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-45)             Total: -45 bytes
   text    data     bss     dec     hex filename
 981541     485    7296  989322   f188a busybox_old
 981486     485    7296  989267   f1853 busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: delete G.prog.strmb for real
Denys Vlasenko [Wed, 19 Dec 2018 11:47:45 +0000 (12:47 +0100)]
bc: delete G.prog.strmb for real

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: in execution loop, reload stack only after insts which can change it
Denys Vlasenko [Wed, 19 Dec 2018 11:35:27 +0000 (12:35 +0100)]
bc: in execution loop, reload stack only after insts which can change it

Only these functions affect G.prog.exestack:
zbc_program_read
zbc_program_call
zbc_program_return
zbc_program_nquit
zbc_program_execStr

function                                             old     new   delta
zbc_program_exec                                    3995    4093     +98
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 98/0)               Total: 98 bytes
   text    data     bss     dec     hex filename
 981364     485    7296  989145   f17d9 busybox_old
 981462     485    7296  989243   f183b busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: simplify bc_array_expand()
Denys Vlasenko [Tue, 18 Dec 2018 19:10:48 +0000 (20:10 +0100)]
bc: simplify bc_array_expand()

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: code shrink
Denys Vlasenko [Tue, 18 Dec 2018 18:20:04 +0000 (19:20 +0100)]
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>
5 years agobc: code shrink
Denys Vlasenko [Tue, 18 Dec 2018 18:17:11 +0000 (19:17 +0100)]
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>
5 years agobc: shrink bc_program_pushVar()
Denys Vlasenko [Tue, 18 Dec 2018 16:14:34 +0000 (17:14 +0100)]
bc: shrink bc_program_pushVar()

function                                             old     new   delta
bc_program_pushVar                                   203     198      -5

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: get rid of G.prog.ob, G.prog.strmb
Denys Vlasenko [Tue, 18 Dec 2018 16:00:35 +0000 (17:00 +0100)]
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>
5 years agobc: do not show -i in --help, it's a NOP (for now)
Denys Vlasenko [Tue, 18 Dec 2018 15:32:25 +0000 (16:32 +0100)]
bc: do not show -i in --help, it's a NOP (for now)

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: style edit, no code changes
Denys Vlasenko [Tue, 18 Dec 2018 15:24:07 +0000 (16:24 +0100)]
bc: style edit, no code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shrink bc_program_index()
Denys Vlasenko [Tue, 18 Dec 2018 14:49:42 +0000 (15:49 +0100)]
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>
5 years agobc: fix "echo -n '#foo' | bc" not eating last 'o'
Denys Vlasenko [Tue, 18 Dec 2018 13:37:16 +0000 (14:37 +0100)]
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>
5 years agobc: shrink zdc_parse_expr()
Denys Vlasenko [Tue, 18 Dec 2018 13:11:35 +0000 (14:11 +0100)]
bc: shrink zdc_parse_expr()

function                                             old     new   delta
zdc_parse_expr                                       656     653      -3

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: optimize zbc_lex_string()
Denys Vlasenko [Tue, 18 Dec 2018 13:03:20 +0000 (14:03 +0100)]
bc: optimize zbc_lex_string()

function                                             old     new   delta
zbc_lex_next                                        2359    2353      -6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
5 years agobc: shrink zdc_lex_string()
Denys Vlasenko [Tue, 18 Dec 2018 12:48:37 +0000 (13:48 +0100)]
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>
5 years agobc: another for() loop simplified
Denys Vlasenko [Tue, 18 Dec 2018 12:22:23 +0000 (13:22 +0100)]
bc: another for() loop simplified

function                                             old     new   delta
zbc_program_print                                    688     686      -2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>