mirror of
https://sourceware.org/git/binutils-gdb.git
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fd67aa1129
Adds two new external authors to etc/update-copyright.py to cover bfd/ax_tls.m4, and adds gprofng to dirs handled automatically, then updates copyright messages as follows: 1) Update cgen/utils.scm emitted copyrights. 2) Run "etc/update-copyright.py --this-year" with an extra external author I haven't committed, 'Kalray SA.', to cover gas testsuite files (which should have their copyright message removed). 3) Build with --enable-maintainer-mode --enable-cgen-maint=yes. 4) Check out */po/*.pot which we don't update frequently.
655 lines
19 KiB
C
655 lines
19 KiB
C
/* atof_generic.c - turn a string of digits into a Flonum
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Copyright (C) 1987-2024 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "as.h"
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#include "safe-ctype.h"
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#include <limits.h>
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#ifdef TRACE
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static void flonum_print (const FLONUM_TYPE *);
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#endif
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#define ASSUME_DECIMAL_MARK_IS_DOT
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/***********************************************************************\
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* *
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* Given a string of decimal digits , with optional decimal *
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* mark and optional decimal exponent (place value) of the *
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* lowest_order decimal digit: produce a floating point *
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* number. The number is 'generic' floating point: our *
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* caller will encode it for a specific machine architecture. *
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* *
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* Assumptions *
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* uses base (radix) 2 *
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* this machine uses 2's complement binary integers *
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* target flonums use " " " " *
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* target flonums exponents fit in a long *
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* *
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\***********************************************************************/
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/*
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Syntax:
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<flonum> ::= <optional-sign> <decimal-number> <optional-exponent>
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<optional-sign> ::= '+' | '-' | {empty}
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<decimal-number> ::= <integer>
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| <integer> <radix-character>
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| <integer> <radix-character> <integer>
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| <radix-character> <integer>
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<optional-exponent> ::= {empty}
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| <exponent-character> <optional-sign> <integer>
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<integer> ::= <digit> | <digit> <integer>
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<digit> ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
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<exponent-character> ::= {one character from "string_of_decimal_exponent_marks"}
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<radix-character> ::= {one character from "string_of_decimal_marks"}
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*/
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int
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atof_generic (/* return pointer to just AFTER number we read. */
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char **address_of_string_pointer,
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/* At most one per number. */
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const char *string_of_decimal_marks,
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const char *string_of_decimal_exponent_marks,
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FLONUM_TYPE *address_of_generic_floating_point_number)
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{
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int return_value = 0; /* 0 means OK. */
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char *first_digit;
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unsigned int number_of_digits_before_decimal;
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unsigned int number_of_digits_after_decimal;
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unsigned long decimal_exponent;
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unsigned int number_of_digits_available;
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char digits_sign_char;
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/*
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* Scan the input string, abstracting (1)digits (2)decimal mark (3) exponent.
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* It would be simpler to modify the string, but we don't; just to be nice
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* to caller.
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* We need to know how many digits we have, so we can allocate space for
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* the digits' value.
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*/
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char *p;
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char c;
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int seen_significant_digit;
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#ifdef ASSUME_DECIMAL_MARK_IS_DOT
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gas_assert (string_of_decimal_marks[0] == '.'
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&& string_of_decimal_marks[1] == 0);
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#define IS_DECIMAL_MARK(c) ((c) == '.')
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#else
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#define IS_DECIMAL_MARK(c) (0 != strchr (string_of_decimal_marks, (c)))
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#endif
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first_digit = *address_of_string_pointer;
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c = *first_digit;
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if (c == '-' || c == '+')
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{
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digits_sign_char = c;
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first_digit++;
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}
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else
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digits_sign_char = '+';
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switch (first_digit[0])
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{
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case 's':
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case 'S':
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case 'q':
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case 'Q':
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if (!strncasecmp ("nan", first_digit + 1, 3))
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{
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address_of_generic_floating_point_number->sign =
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digits_sign_char == '+' ? TOUPPER (first_digit[0])
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: TOLOWER (first_digit[0]);
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address_of_generic_floating_point_number->exponent = 0;
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address_of_generic_floating_point_number->leader =
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address_of_generic_floating_point_number->low;
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*address_of_string_pointer = first_digit + 4;
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return 0;
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}
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break;
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case 'n':
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case 'N':
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if (!strncasecmp ("nan", first_digit, 3))
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{
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address_of_generic_floating_point_number->sign =
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digits_sign_char == '+' ? 0 : 'q';
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address_of_generic_floating_point_number->exponent = 0;
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address_of_generic_floating_point_number->leader =
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address_of_generic_floating_point_number->low;
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*address_of_string_pointer = first_digit + 3;
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return 0;
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}
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break;
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case 'i':
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case 'I':
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if (!strncasecmp ("inf", first_digit, 3))
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{
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address_of_generic_floating_point_number->sign =
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digits_sign_char == '+' ? 'P' : 'N';
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address_of_generic_floating_point_number->exponent = 0;
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address_of_generic_floating_point_number->leader =
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address_of_generic_floating_point_number->low;
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first_digit += 3;
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if (!strncasecmp ("inity", first_digit, 5))
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first_digit += 5;
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*address_of_string_pointer = first_digit;
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return 0;
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}
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break;
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}
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number_of_digits_before_decimal = 0;
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number_of_digits_after_decimal = 0;
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decimal_exponent = 0;
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seen_significant_digit = 0;
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for (p = first_digit;
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(((c = *p) != '\0')
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&& (!c || !IS_DECIMAL_MARK (c))
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&& (!c || !strchr (string_of_decimal_exponent_marks, c)));
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p++)
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{
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if (ISDIGIT (c))
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{
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if (seen_significant_digit || c > '0')
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{
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++number_of_digits_before_decimal;
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seen_significant_digit = 1;
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}
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else
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{
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first_digit++;
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}
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}
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else
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{
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break; /* p -> char after pre-decimal digits. */
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}
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} /* For each digit before decimal mark. */
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#ifndef OLD_FLOAT_READS
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/* Ignore trailing 0's after the decimal point. The original code here
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(ifdef'd out) does not do this, and numbers like
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4.29496729600000000000e+09 (2**31)
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come out inexact for some reason related to length of the digit
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string. */
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/* The case number_of_digits_before_decimal = 0 is handled for
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deleting zeros after decimal. In this case the decimal mark and
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the first zero digits after decimal mark are skipped. */
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seen_significant_digit = 0;
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unsigned long subtract_decimal_exponent = 0;
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if (c && IS_DECIMAL_MARK (c))
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{
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unsigned int zeros = 0; /* Length of current string of zeros. */
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if (number_of_digits_before_decimal == 0)
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/* Skip decimal mark. */
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first_digit++;
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for (p++; (c = *p) && ISDIGIT (c); p++)
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{
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if (c == '0')
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{
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if (number_of_digits_before_decimal == 0
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&& !seen_significant_digit)
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{
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/* Skip '0' and the decimal mark. */
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first_digit++;
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subtract_decimal_exponent--;
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}
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else
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zeros++;
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}
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else
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{
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seen_significant_digit = 1;
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number_of_digits_after_decimal += 1 + zeros;
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zeros = 0;
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}
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}
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}
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#else
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if (c && IS_DECIMAL_MARK (c))
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{
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for (p++;
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(((c = *p) != '\0')
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&& (!c || !strchr (string_of_decimal_exponent_marks, c)));
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p++)
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{
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if (ISDIGIT (c))
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{
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/* This may be retracted below. */
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number_of_digits_after_decimal++;
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if ( /* seen_significant_digit || */ c > '0')
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{
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seen_significant_digit = true;
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}
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}
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else
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{
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if (!seen_significant_digit)
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{
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number_of_digits_after_decimal = 0;
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}
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break;
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}
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} /* For each digit after decimal mark. */
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}
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while (number_of_digits_after_decimal
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&& first_digit[number_of_digits_before_decimal
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+ number_of_digits_after_decimal] == '0')
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--number_of_digits_after_decimal;
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#endif
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if (flag_m68k_mri)
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{
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while (c == '_')
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c = *++p;
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}
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if (c && strchr (string_of_decimal_exponent_marks, c))
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{
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char digits_exponent_sign_char;
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c = *++p;
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if (flag_m68k_mri)
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{
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while (c == '_')
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c = *++p;
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}
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if (c && strchr ("+-", c))
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{
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digits_exponent_sign_char = c;
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c = *++p;
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}
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else
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{
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digits_exponent_sign_char = '+';
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}
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for (; (c); c = *++p)
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{
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if (ISDIGIT (c))
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{
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if (decimal_exponent > LONG_MAX / 10
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|| (decimal_exponent == LONG_MAX / 10
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&& c > '0' + (char) (LONG_MAX - LONG_MAX / 10 * 10)))
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return_value = ERROR_EXPONENT_OVERFLOW;
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decimal_exponent = decimal_exponent * 10 + c - '0';
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}
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else
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{
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break;
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}
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}
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if (digits_exponent_sign_char == '-')
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{
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decimal_exponent = -decimal_exponent;
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}
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}
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#ifndef OLD_FLOAT_READS
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/* Subtract_decimal_exponent != 0 when number_of_digits_before_decimal = 0
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and first digit after decimal is '0'. */
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decimal_exponent += subtract_decimal_exponent;
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#endif
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*address_of_string_pointer = p;
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number_of_digits_available =
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number_of_digits_before_decimal + number_of_digits_after_decimal;
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if (number_of_digits_available == 0)
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{
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address_of_generic_floating_point_number->exponent = 0; /* Not strictly necessary */
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address_of_generic_floating_point_number->leader
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= -1 + address_of_generic_floating_point_number->low;
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address_of_generic_floating_point_number->sign = digits_sign_char;
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/* We have just concocted (+/-)0.0E0 */
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}
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else
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{
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int count; /* Number of useful digits left to scan. */
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LITTLENUM_TYPE *temporary_binary_low = NULL;
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LITTLENUM_TYPE *power_binary_low = NULL;
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LITTLENUM_TYPE *digits_binary_low;
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unsigned int precision;
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unsigned int maximum_useful_digits;
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unsigned int number_of_digits_to_use;
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unsigned int more_than_enough_bits_for_digits;
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unsigned int more_than_enough_littlenums_for_digits;
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unsigned int size_of_digits_in_littlenums;
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unsigned int size_of_digits_in_chars;
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FLONUM_TYPE power_of_10_flonum;
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FLONUM_TYPE digits_flonum;
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precision = (address_of_generic_floating_point_number->high
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- address_of_generic_floating_point_number->low
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+ 1); /* Number of destination littlenums. */
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/* precision includes two littlenums worth of guard bits,
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so this gives us 10 decimal guard digits here. */
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maximum_useful_digits = (precision
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* LITTLENUM_NUMBER_OF_BITS
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* 1000000 / 3321928
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+ 1); /* round up. */
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if (number_of_digits_available > maximum_useful_digits)
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{
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number_of_digits_to_use = maximum_useful_digits;
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}
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else
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{
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number_of_digits_to_use = number_of_digits_available;
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}
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/* Cast these to SIGNED LONG first, otherwise, on systems with
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LONG wider than INT (such as Alpha OSF/1), unsignedness may
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cause unexpected results. */
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decimal_exponent += ((long) number_of_digits_before_decimal
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- (long) number_of_digits_to_use);
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more_than_enough_bits_for_digits
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= (number_of_digits_to_use * 3321928 / 1000000 + 1);
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more_than_enough_littlenums_for_digits
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= (more_than_enough_bits_for_digits
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/ LITTLENUM_NUMBER_OF_BITS)
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+ 2;
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/* Compute (digits) part. In "12.34E56" this is the "1234" part.
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Arithmetic is exact here. If no digits are supplied then this
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part is a 0 valued binary integer. Allocate room to build up
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the binary number as littlenums. We want this memory to
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disappear when we leave this function. Assume no alignment
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problems => (room for n objects) == n * (room for 1
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object). */
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size_of_digits_in_littlenums = more_than_enough_littlenums_for_digits;
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size_of_digits_in_chars = size_of_digits_in_littlenums
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* sizeof (LITTLENUM_TYPE);
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digits_binary_low = (LITTLENUM_TYPE *)
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xmalloc (size_of_digits_in_chars);
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memset ((char *) digits_binary_low, '\0', size_of_digits_in_chars);
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/* Digits_binary_low[] is allocated and zeroed. */
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/*
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* Parse the decimal digits as if * digits_low was in the units position.
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* Emit a binary number into digits_binary_low[].
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*
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* Use a large-precision version of:
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* (((1st-digit) * 10 + 2nd-digit) * 10 + 3rd-digit ...) * 10 + last-digit
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*/
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for (p = first_digit, count = number_of_digits_to_use; count; p++, --count)
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{
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c = *p;
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if (ISDIGIT (c))
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{
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/*
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* Multiply by 10. Assume can never overflow.
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* Add this digit to digits_binary_low[].
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*/
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long carry;
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LITTLENUM_TYPE *littlenum_pointer;
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LITTLENUM_TYPE *littlenum_limit;
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littlenum_limit = digits_binary_low
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+ more_than_enough_littlenums_for_digits
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- 1;
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carry = c - '0'; /* char -> binary */
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for (littlenum_pointer = digits_binary_low;
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littlenum_pointer <= littlenum_limit;
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littlenum_pointer++)
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{
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long work;
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work = carry + 10 * (long) (*littlenum_pointer);
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*littlenum_pointer = work & LITTLENUM_MASK;
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carry = work >> LITTLENUM_NUMBER_OF_BITS;
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}
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if (carry != 0)
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{
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/*
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* We have a GROSS internal error.
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* This should never happen.
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*/
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as_fatal (_("failed sanity check"));
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}
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}
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else
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{
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++count; /* '.' doesn't alter digits used count. */
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}
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}
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/*
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* Digits_binary_low[] properly encodes the value of the digits.
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* Forget about any high-order littlenums that are 0.
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*/
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while (digits_binary_low[size_of_digits_in_littlenums - 1] == 0
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&& size_of_digits_in_littlenums >= 2)
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size_of_digits_in_littlenums--;
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digits_flonum.low = digits_binary_low;
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digits_flonum.high = digits_binary_low + size_of_digits_in_littlenums - 1;
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digits_flonum.leader = digits_flonum.high;
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digits_flonum.exponent = 0;
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/*
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* The value of digits_flonum . sign should not be important.
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* We have already decided the output's sign.
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* We trust that the sign won't influence the other parts of the number!
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* So we give it a value for these reasons:
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* (1) courtesy to humans reading/debugging
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* these numbers so they don't get excited about strange values
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* (2) in future there may be more meaning attached to sign,
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* and what was
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* harmless noise may become disruptive, ill-conditioned (or worse)
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* input.
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*/
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digits_flonum.sign = '+';
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{
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/*
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* Compute the mantissa (& exponent) of the power of 10.
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* If successful, then multiply the power of 10 by the digits
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* giving return_binary_mantissa and return_binary_exponent.
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*/
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int decimal_exponent_is_negative;
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/* This refers to the "-56" in "12.34E-56". */
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/* FALSE: decimal_exponent is positive (or 0) */
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/* TRUE: decimal_exponent is negative */
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FLONUM_TYPE temporary_flonum;
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unsigned int size_of_power_in_littlenums;
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unsigned int size_of_power_in_chars;
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size_of_power_in_littlenums = precision;
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/* Precision has a built-in fudge factor so we get a few guard bits. */
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decimal_exponent_is_negative = (long) decimal_exponent < 0;
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if (decimal_exponent_is_negative)
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{
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decimal_exponent = -decimal_exponent;
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}
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/* From now on: the decimal exponent is > 0. Its sign is separate. */
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size_of_power_in_chars = size_of_power_in_littlenums
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* sizeof (LITTLENUM_TYPE) + 2;
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power_binary_low = (LITTLENUM_TYPE *) xmalloc (size_of_power_in_chars);
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temporary_binary_low = (LITTLENUM_TYPE *) xmalloc (size_of_power_in_chars);
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memset ((char *) power_binary_low, '\0', size_of_power_in_chars);
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*power_binary_low = 1;
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power_of_10_flonum.exponent = 0;
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power_of_10_flonum.low = power_binary_low;
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power_of_10_flonum.leader = power_binary_low;
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power_of_10_flonum.high = power_binary_low + size_of_power_in_littlenums - 1;
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power_of_10_flonum.sign = '+';
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temporary_flonum.low = temporary_binary_low;
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temporary_flonum.high = temporary_binary_low + size_of_power_in_littlenums - 1;
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/*
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* (power) == 1.
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* Space for temporary_flonum allocated.
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*/
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/*
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* ...
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*
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* WHILE more bits
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* DO find next bit (with place value)
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* multiply into power mantissa
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* OD
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*/
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{
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int place_number_limit;
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/* Any 10^(2^n) whose "n" exceeds this */
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/* value will fall off the end of */
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/* flonum_XXXX_powers_of_ten[]. */
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int place_number;
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const FLONUM_TYPE *multiplicand; /* -> 10^(2^n) */
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place_number_limit = table_size_of_flonum_powers_of_ten;
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multiplicand = (decimal_exponent_is_negative
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? flonum_negative_powers_of_ten
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: flonum_positive_powers_of_ten);
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for (place_number = 1;/* Place value of this bit of exponent. */
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decimal_exponent;/* Quit when no more 1 bits in exponent. */
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decimal_exponent >>= 1, place_number++)
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{
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if (decimal_exponent & 1)
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{
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if (place_number > place_number_limit)
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{
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/* The decimal exponent has a magnitude so great
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that our tables can't help us fragment it.
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Although this routine is in error because it
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can't imagine a number that big, signal an
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error as if it is the user's fault for
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presenting such a big number. */
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return_value = ERROR_EXPONENT_OVERFLOW;
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/* quit out of loop gracefully */
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decimal_exponent = 0;
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}
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else
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{
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#ifdef TRACE
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printf ("before multiply, place_number = %d., power_of_10_flonum:\n",
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place_number);
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flonum_print (&power_of_10_flonum);
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(void) putchar ('\n');
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#endif
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#ifdef TRACE
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printf ("multiplier:\n");
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flonum_print (multiplicand + place_number);
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(void) putchar ('\n');
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#endif
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flonum_multip (multiplicand + place_number,
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&power_of_10_flonum, &temporary_flonum);
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#ifdef TRACE
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printf ("after multiply:\n");
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flonum_print (&temporary_flonum);
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(void) putchar ('\n');
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#endif
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flonum_copy (&temporary_flonum, &power_of_10_flonum);
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#ifdef TRACE
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printf ("after copy:\n");
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flonum_print (&power_of_10_flonum);
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(void) putchar ('\n');
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#endif
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} /* If this bit of decimal_exponent was computable.*/
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} /* If this bit of decimal_exponent was set. */
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} /* For each bit of binary representation of exponent */
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#ifdef TRACE
|
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printf ("after computing power_of_10_flonum:\n");
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flonum_print (&power_of_10_flonum);
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(void) putchar ('\n');
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#endif
|
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}
|
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}
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|
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/*
|
|
* power_of_10_flonum is power of ten in binary (mantissa) , (exponent).
|
|
* It may be the number 1, in which case we don't NEED to multiply.
|
|
*
|
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* Multiply (decimal digits) by power_of_10_flonum.
|
|
*/
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|
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flonum_multip (&power_of_10_flonum, &digits_flonum, address_of_generic_floating_point_number);
|
|
/* Assert sign of the number we made is '+'. */
|
|
address_of_generic_floating_point_number->sign = digits_sign_char;
|
|
|
|
free (temporary_binary_low);
|
|
free (power_binary_low);
|
|
free (digits_binary_low);
|
|
}
|
|
return return_value;
|
|
}
|
|
|
|
#ifdef TRACE
|
|
static void
|
|
flonum_print (f)
|
|
const FLONUM_TYPE *f;
|
|
{
|
|
LITTLENUM_TYPE *lp;
|
|
char littlenum_format[10];
|
|
sprintf (littlenum_format, " %%0%dx", sizeof (LITTLENUM_TYPE) * 2);
|
|
#define print_littlenum(LP) (printf (littlenum_format, LP))
|
|
printf ("flonum @%p %c e%ld", f, f->sign, f->exponent);
|
|
if (f->low < f->high)
|
|
for (lp = f->high; lp >= f->low; lp--)
|
|
print_littlenum (*lp);
|
|
else
|
|
for (lp = f->low; lp <= f->high; lp++)
|
|
print_littlenum (*lp);
|
|
printf ("\n");
|
|
fflush (stdout);
|
|
}
|
|
#endif
|
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|
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/* end of atof_generic.c */
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