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[src/trunk]: src/usr.bin/indent indent: reduce code and data size for lexing ...
details: https://anonhg.NetBSD.org/src/rev/ddd49c6d3d20
branches: trunk
changeset: 987395:ddd49c6d3d20
user: rillig <rillig%NetBSD.org@localhost>
date: Sat Sep 25 19:49:13 2021 +0000
description:
indent: reduce code and data size for lexing of numbers
Instead of having a table of strings (121 pointers + 121 data
relocations), reduce that table to the actual character data and use a
secondary table for looking up the correct row in the main table.
No functional change.
diffstat:
usr.bin/indent/indent.c | 5 +-
usr.bin/indent/indent.h | 3 +-
usr.bin/indent/lexi.c | 92 +++++++++++++++++++++++++-----------------------
3 files changed, 51 insertions(+), 49 deletions(-)
diffs (185 lines):
diff -r 292c3b74b8ef -r ddd49c6d3d20 usr.bin/indent/indent.c
--- a/usr.bin/indent/indent.c Sat Sep 25 19:16:31 2021 +0000
+++ b/usr.bin/indent/indent.c Sat Sep 25 19:49:13 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: indent.c,v 1.76 2021/09/25 18:49:03 rillig Exp $ */
+/* $NetBSD: indent.c,v 1.77 2021/09/25 19:49:13 rillig Exp $ */
/*-
* SPDX-License-Identifier: BSD-4-Clause
@@ -43,7 +43,7 @@
#include <sys/cdefs.h>
#if defined(__NetBSD__)
-__RCSID("$NetBSD: indent.c,v 1.76 2021/09/25 18:49:03 rillig Exp $");
+__RCSID("$NetBSD: indent.c,v 1.77 2021/09/25 19:49:13 rillig Exp $");
#elif defined(__FreeBSD__)
__FBSDID("$FreeBSD: head/usr.bin/indent/indent.c 340138 2018-11-04 19:24:49Z oshogbo $");
#endif
@@ -390,7 +390,6 @@
buf_init(&code);
buf_init(&token);
alloc_typenames();
- init_constant_tt();
opt.else_if = true; /* XXX: redundant? */
in_buffer = xmalloc(10);
diff -r 292c3b74b8ef -r ddd49c6d3d20 usr.bin/indent/indent.h
--- a/usr.bin/indent/indent.h Sat Sep 25 19:16:31 2021 +0000
+++ b/usr.bin/indent/indent.h Sat Sep 25 19:49:13 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: indent.h,v 1.22 2021/09/25 17:36:51 rillig Exp $ */
+/* $NetBSD: indent.h,v 1.23 2021/09/25 19:49:13 rillig Exp $ */
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
@@ -47,7 +47,6 @@
int compute_label_indent(void);
int indentation_after_range(int, const char *, const char *);
int indentation_after(int, const char *);
-void init_constant_tt(void);
#ifdef debug
void debug_vis_range(const char *, const char *, const char *,
const char *);
diff -r 292c3b74b8ef -r ddd49c6d3d20 usr.bin/indent/lexi.c
--- a/usr.bin/indent/lexi.c Sat Sep 25 19:16:31 2021 +0000
+++ b/usr.bin/indent/lexi.c Sat Sep 25 19:49:13 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: lexi.c,v 1.55 2021/09/25 17:36:51 rillig Exp $ */
+/* $NetBSD: lexi.c,v 1.56 2021/09/25 19:49:13 rillig Exp $ */
/*-
* SPDX-License-Identifier: BSD-4-Clause
@@ -43,7 +43,7 @@
#include <sys/cdefs.h>
#if defined(__NetBSD__)
-__RCSID("$NetBSD: lexi.c,v 1.55 2021/09/25 17:36:51 rillig Exp $");
+__RCSID("$NetBSD: lexi.c,v 1.56 2021/09/25 19:49:13 rillig Exp $");
#elif defined(__FreeBSD__)
__FBSDID("$FreeBSD: head/usr.bin/indent/lexi.c 337862 2018-08-15 18:19:45Z pstef $");
#endif
@@ -52,6 +52,7 @@
#include <err.h>
#include <stdio.h>
#include <ctype.h>
+#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
@@ -133,7 +134,7 @@
* HP H* "." H+ P FS? -> $float; "0" O* IS? -> $int;
* HP H+ "." P FS -> $float; BP B+ IS? -> $int;
*/
-static char const *table[] = {
+static const char num_lex_state[][26] = {
/* examples:
00
s 0xx
@@ -142,40 +143,42 @@
r 11ee0001101lbuuxx.a.pp
t.01.e+008bLuxll0Ll.aa.p+0
states: ABCDEFGHIJKLMNOPQRSTUVWXYZ */
- ['0'] = "CEIDEHHHIJQ U Q VUVVZZZ",
- ['1'] = "DEIDEHHHIJQ U Q VUVVZZZ",
- ['7'] = "DEIDEHHHIJ U VUVVZZZ",
- ['9'] = "DEJDEHHHJJ U VUVVZZZ",
- ['a'] = " U VUVV ",
- ['b'] = " K U VUVV ",
- ['e'] = " FFF FF U VUVV ",
- ['f'] = " f f U VUVV f",
- ['u'] = " MM M i iiM M ",
- ['x'] = " N ",
- ['p'] = " FFX ",
- ['L'] = " LLf fL PR Li L f",
- ['l'] = " OOf fO S P O i O f",
- ['+'] = " G Y ",
- ['.'] = "B EE EE T W ",
+ [0] = "uuiifuufiuuiiuiiiiiuiuuuuu",
+ [1] = "CEIDEHHHIJQ U Q VUVVZZZ",
+ [2] = "DEIDEHHHIJQ U Q VUVVZZZ",
+ [3] = "DEIDEHHHIJ U VUVVZZZ",
+ [4] = "DEJDEHHHJJ U VUVVZZZ",
+ [5] = " U VUVV ",
+ [6] = " K U VUVV ",
+ [7] = " FFF FF U VUVV ",
+ [8] = " f f U VUVV f",
+ [9] = " LLf fL PR Li L f",
+ [10] = " OOf fO S P O i O f",
+ [11] = " FFX ",
+ [12] = " MM M i iiM M ",
+ [13] = " N ",
+ [14] = " G Y ",
+ [15] = "B EE EE T W ",
/* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
- [0] = "uuiifuufiuuiiuiiiiiuiuuuuu",
};
-/* Initialize constant transition table */
-void
-init_constant_tt(void)
-{
- table['-'] = table['+'];
- table['8'] = table['9'];
- table['2'] = table['3'] = table['4'] = table['5'] = table['6'] = table['7'];
- table['A'] = table['C'] = table['D'] = table['c'] = table['d'] = table['a'];
- table['B'] = table['b'];
- table['E'] = table['e'];
- table['U'] = table['u'];
- table['X'] = table['x'];
- table['P'] = table['p'];
- table['F'] = table['f'];
-}
+static const uint8_t num_lex_row[] = {
+ ['0'] = 1,
+ ['1'] = 2,
+ ['2'] = 3, ['3'] = 3, ['4'] = 3, ['5'] = 3, ['6'] = 3, ['7'] = 3,
+ ['8'] = 4, ['9'] = 4,
+ ['A'] = 5, ['a'] = 5, ['C'] = 5, ['c'] = 5, ['D'] = 5, ['d'] = 5,
+ ['B'] = 6, ['b'] = 6,
+ ['E'] = 7, ['e'] = 7,
+ ['F'] = 8, ['f'] = 8,
+ ['L'] = 9,
+ ['l'] = 10,
+ ['P'] = 11, ['p'] = 11,
+ ['U'] = 12, ['u'] = 12,
+ ['X'] = 13, ['x'] = 13,
+ ['+'] = 14, ['-'] = 14,
+ ['.'] = 15,
+};
static char
inbuf_peek(void)
@@ -275,21 +278,22 @@
static void
lex_number(void)
{
- char s;
- unsigned char i;
-
- for (s = 'A'; s != 'f' && s != 'i' && s != 'u'; ) {
- i = (unsigned char)*buf_ptr;
- if (i >= nitems(table) || table[i] == NULL ||
- table[i][s - 'A'] == ' ') {
- s = table[0][s - 'A'];
+ for (uint8_t s = 'A'; s != 'f' && s != 'i' && s != 'u'; ) {
+ uint8_t ch = (uint8_t)*buf_ptr;
+ if (ch >= nitems(num_lex_row) || num_lex_row[ch] == 0)
+ break;
+ uint8_t row = num_lex_row[ch];
+ if (num_lex_state[row][s - 'A'] == ' ') {
+ /*
+ * num_lex_state[0][s - 'A'] now indicates the type:
+ * f = floating, ch = integer, u = unknown
+ */
break;
}
- s = table[i][s - 'A'];
+ s = num_lex_state[row][s - 'A'];
check_size_token(1);
*token.e++ = inbuf_next();
}
- /* s now indicates the type: f(loating), i(integer), u(nknown) */
}
static void
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