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8d3f8ca12a
The $Id$ keywords were used in Subversion where they can be substituted with filename, last revision number change, last changed date, and last user who changed it. In Git this functionality is different and can be done with Git attribute ident. These need to be defined manually for each file in the .gitattributes file and are afterwards replaced with 40-character hexadecimal blob object name which is based only on the particular file contents. This patch simplifies handling of $Id$ keywords by removing them since they are not used anymore.
354 lines
9.8 KiB
C
354 lines
9.8 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2018 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Sascha Schumann <sascha@schumann.cx> |
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| Ard Biesheuvel <ard.biesheuvel@linaro.org> |
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+----------------------------------------------------------------------+
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*/
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#include "zend_portability.h"
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#ifndef ZEND_MULTIPLY_H
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#define ZEND_MULTIPLY_H
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#if PHP_HAVE_BUILTIN_SMULL_OVERFLOW && SIZEOF_LONG == SIZEOF_ZEND_LONG
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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long __tmpvar; \
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if (((usedval) = __builtin_smull_overflow((a), (b), &__tmpvar))) { \
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(dval) = (double) (a) * (double) (b); \
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} \
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else (lval) = __tmpvar; \
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} while (0)
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#elif PHP_HAVE_BUILTIN_SMULLL_OVERFLOW && SIZEOF_LONG_LONG == SIZEOF_ZEND_LONG
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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long long __tmpvar; \
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if (((usedval) = __builtin_smulll_overflow((a), (b), &__tmpvar))) { \
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(dval) = (double) (a) * (double) (b); \
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} \
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else (lval) = __tmpvar; \
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} while (0)
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#elif (defined(__i386__) || defined(__x86_64__)) && defined(__GNUC__)
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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zend_long __tmpvar; \
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__asm__ ("imul %3,%0\n" \
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"adc $0,%1" \
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: "=r"(__tmpvar),"=r"(usedval) \
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: "0"(a), "r"(b), "1"(0)); \
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if (usedval) (dval) = (double) (a) * (double) (b); \
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else (lval) = __tmpvar; \
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} while (0)
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#elif defined(__arm__) && defined(__GNUC__)
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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zend_long __tmpvar; \
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__asm__("smull %0, %1, %2, %3\n" \
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"sub %1, %1, %0, asr #31" \
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: "=r"(__tmpvar), "=r"(usedval) \
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: "r"(a), "r"(b)); \
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if (usedval) (dval) = (double) (a) * (double) (b); \
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else (lval) = __tmpvar; \
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} while (0)
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#elif defined(__aarch64__) && defined(__GNUC__)
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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zend_long __tmpvar; \
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__asm__("mul %0, %2, %3\n" \
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"smulh %1, %2, %3\n" \
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"sub %1, %1, %0, asr #63\n" \
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: "=&r"(__tmpvar), "=&r"(usedval) \
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: "r"(a), "r"(b)); \
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if (usedval) (dval) = (double) (a) * (double) (b); \
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else (lval) = __tmpvar; \
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} while (0)
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#elif defined(ZEND_WIN32)
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# ifdef _M_X64
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# pragma intrinsic(_mul128)
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# define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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__int64 __high; \
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__int64 __low = _mul128((a), (b), &__high); \
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if ((__low >> 63I64) == __high) { \
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(usedval) = 0; \
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(lval) = __low; \
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} else { \
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(usedval) = 1; \
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(dval) = (double)(a) * (double)(b); \
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} \
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} while (0)
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# else
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# define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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zend_long __lres = (a) * (b); \
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long double __dres = (long double)(a) * (long double)(b); \
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long double __delta = (long double) __lres - __dres; \
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if ( ((usedval) = (( __dres + __delta ) != __dres))) { \
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(dval) = __dres; \
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} else { \
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(lval) = __lres; \
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} \
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} while (0)
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# endif
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#elif defined(__powerpc64__) && defined(__GNUC__)
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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long __low, __high; \
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__asm__("mulld %0,%2,%3\n\t" \
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"mulhd %1,%2,%3\n" \
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: "=&r"(__low), "=&r"(__high) \
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: "r"(a), "r"(b)); \
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if ((__low >> 63) != __high) { \
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(dval) = (double) (a) * (double) (b); \
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(usedval) = 1; \
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} else { \
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(lval) = __low; \
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(usedval) = 0; \
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} \
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} while (0)
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#elif SIZEOF_ZEND_LONG == 4
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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int64_t __result = (int64_t) (a) * (int64_t) (b); \
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if (__result > ZEND_LONG_MAX || __result < ZEND_LONG_MIN) { \
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(dval) = (double) __result; \
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(usedval) = 1; \
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} else { \
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(lval) = (long) __result; \
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(usedval) = 0; \
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} \
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} while (0)
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#else
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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long __lres = (a) * (b); \
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long double __dres = (long double)(a) * (long double)(b); \
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long double __delta = (long double) __lres - __dres; \
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if ( ((usedval) = (( __dres + __delta ) != __dres))) { \
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(dval) = __dres; \
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} else { \
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(lval) = __lres; \
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} \
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} while (0)
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#endif
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#if defined(__GNUC__) && (defined(__native_client__) || defined(i386))
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static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, int *overflow)
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{
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size_t res = nmemb;
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size_t m_overflow = 0;
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if (ZEND_CONST_COND(offset == 0, 0)) {
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__asm__ ("mull %3\n\tadcl $0,%1"
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: "=&a"(res), "=&d" (m_overflow)
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: "%0"(res),
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"rm"(size));
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} else {
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__asm__ ("mull %3\n\taddl %4,%0\n\tadcl $0,%1"
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: "=&a"(res), "=&d" (m_overflow)
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: "%0"(res),
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"rm"(size),
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"rm"(offset));
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}
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if (UNEXPECTED(m_overflow)) {
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*overflow = 1;
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return 0;
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}
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*overflow = 0;
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return res;
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}
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#elif defined(__GNUC__) && defined(__x86_64__)
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static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, int *overflow)
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{
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size_t res = nmemb;
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zend_ulong m_overflow = 0;
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#ifdef __ILP32__ /* x32 */
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# define LP_SUFF "l"
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#else /* amd64 */
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# define LP_SUFF "q"
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#endif
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if (ZEND_CONST_COND(offset == 0, 0)) {
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__asm__ ("mul" LP_SUFF " %3\n\t"
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"adc $0,%1"
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: "=&a"(res), "=&d" (m_overflow)
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: "%0"(res),
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"rm"(size));
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} else {
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__asm__ ("mul" LP_SUFF " %3\n\t"
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"add %4,%0\n\t"
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"adc $0,%1"
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: "=&a"(res), "=&d" (m_overflow)
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: "%0"(res),
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"rm"(size),
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"rm"(offset));
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}
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#undef LP_SUFF
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if (UNEXPECTED(m_overflow)) {
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*overflow = 1;
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return 0;
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}
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*overflow = 0;
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return res;
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}
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#elif defined(__GNUC__) && defined(__arm__)
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static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, int *overflow)
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{
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size_t res;
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zend_ulong m_overflow;
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__asm__ ("umlal %0,%1,%2,%3"
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: "=r"(res), "=r"(m_overflow)
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: "r"(nmemb),
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"r"(size),
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"0"(offset),
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"1"(0));
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if (UNEXPECTED(m_overflow)) {
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*overflow = 1;
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return 0;
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}
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*overflow = 0;
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return res;
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}
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#elif defined(__GNUC__) && defined(__aarch64__)
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static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, int *overflow)
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{
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size_t res;
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zend_ulong m_overflow;
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__asm__ ("mul %0,%2,%3\n\tumulh %1,%2,%3\n\tadds %0,%0,%4\n\tadc %1,%1,xzr"
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: "=&r"(res), "=&r"(m_overflow)
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: "r"(nmemb),
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"r"(size),
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"r"(offset));
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if (UNEXPECTED(m_overflow)) {
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*overflow = 1;
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return 0;
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}
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*overflow = 0;
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return res;
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}
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#elif defined(__GNUC__) && defined(__powerpc64__)
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static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, int *overflow)
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{
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size_t res;
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unsigned long m_overflow;
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__asm__ ("mulld %0,%2,%3\n\t"
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"mulhdu %1,%2,%3\n\t"
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"addc %0,%0,%4\n\t"
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"addze %1,%1\n"
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: "=&r"(res), "=&r"(m_overflow)
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: "r"(nmemb),
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"r"(size),
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"r"(offset));
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if (UNEXPECTED(m_overflow)) {
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*overflow = 1;
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return 0;
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}
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*overflow = 0;
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return res;
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}
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#elif SIZEOF_SIZE_T == 4
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static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, int *overflow)
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{
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uint64_t res = (uint64_t) nmemb * (uint64_t) size + (uint64_t) offset;
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if (UNEXPECTED(res > UINT64_C(0xFFFFFFFF))) {
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*overflow = 1;
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return 0;
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}
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*overflow = 0;
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return (size_t) res;
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}
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#else
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static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, int *overflow)
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{
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size_t res = nmemb * size + offset;
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double _d = (double)nmemb * (double)size + (double)offset;
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double _delta = (double)res - _d;
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if (UNEXPECTED((_d + _delta ) != _d)) {
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*overflow = 1;
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return 0;
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}
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*overflow = 0;
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return res;
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}
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#endif
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static zend_always_inline size_t zend_safe_address_guarded(size_t nmemb, size_t size, size_t offset)
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{
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int overflow;
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size_t ret = zend_safe_address(nmemb, size, offset, &overflow);
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if (UNEXPECTED(overflow)) {
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zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (%zu * %zu + %zu)", nmemb, size, offset);
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return 0;
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}
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return ret;
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}
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/* A bit more generic version of the same */
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static zend_always_inline size_t zend_safe_addmult(size_t nmemb, size_t size, size_t offset, const char *message)
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{
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int overflow;
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size_t ret = zend_safe_address(nmemb, size, offset, &overflow);
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if (UNEXPECTED(overflow)) {
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zend_error_noreturn(E_ERROR, "Possible integer overflow in %s (%zu * %zu + %zu)", message, nmemb, size, offset);
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return 0;
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}
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return ret;
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}
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#endif /* ZEND_MULTIPLY_H */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* indent-tabs-mode: t
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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