php-src/Zend/zend_multiply.h
George Peter Banyard fa8d9b1183 Improve type declarations for Zend APIs
Voidification of Zend API which always succeeded
Use bool argument types instead of int for boolean arguments
Use bool return type for functions which return true/false (1/0)
Use zend_result return type for functions which return SUCCESS/FAILURE as they don't follow normal boolean semantics

Closes GH-6002
2020-08-28 15:41:27 +02:00

344 lines
9.6 KiB
C

/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Sascha Schumann <sascha@schumann.cx> |
| Ard Biesheuvel <ard.biesheuvel@linaro.org> |
+----------------------------------------------------------------------+
*/
#include "zend_portability.h"
#ifndef ZEND_MULTIPLY_H
#define ZEND_MULTIPLY_H
#if PHP_HAVE_BUILTIN_SMULL_OVERFLOW && SIZEOF_LONG == SIZEOF_ZEND_LONG
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
long __tmpvar; \
if (((usedval) = __builtin_smull_overflow((a), (b), &__tmpvar))) { \
(dval) = (double) (a) * (double) (b); \
} \
else (lval) = __tmpvar; \
} while (0)
#elif PHP_HAVE_BUILTIN_SMULLL_OVERFLOW && SIZEOF_LONG_LONG == SIZEOF_ZEND_LONG
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
long long __tmpvar; \
if (((usedval) = __builtin_smulll_overflow((a), (b), &__tmpvar))) { \
(dval) = (double) (a) * (double) (b); \
} \
else (lval) = __tmpvar; \
} while (0)
#elif (defined(__i386__) || defined(__x86_64__)) && defined(__GNUC__)
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
zend_long __tmpvar; \
__asm__ ("imul %3,%0\n" \
"adc $0,%1" \
: "=r"(__tmpvar),"=r"(usedval) \
: "0"(a), "r"(b), "1"(0)); \
if (usedval) (dval) = (double) (a) * (double) (b); \
else (lval) = __tmpvar; \
} while (0)
#elif defined(__arm__) && defined(__GNUC__)
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
zend_long __tmpvar; \
__asm__("smull %0, %1, %2, %3\n" \
"sub %1, %1, %0, asr #31" \
: "=r"(__tmpvar), "=r"(usedval) \
: "r"(a), "r"(b)); \
if (usedval) (dval) = (double) (a) * (double) (b); \
else (lval) = __tmpvar; \
} while (0)
#elif defined(__aarch64__) && defined(__GNUC__)
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
zend_long __tmpvar; \
__asm__("mul %0, %2, %3\n" \
"smulh %1, %2, %3\n" \
"sub %1, %1, %0, asr #63\n" \
: "=&r"(__tmpvar), "=&r"(usedval) \
: "r"(a), "r"(b)); \
if (usedval) (dval) = (double) (a) * (double) (b); \
else (lval) = __tmpvar; \
} while (0)
#elif defined(ZEND_WIN32)
# ifdef _M_X64
# pragma intrinsic(_mul128)
# define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
__int64 __high; \
__int64 __low = _mul128((a), (b), &__high); \
if ((__low >> 63I64) == __high) { \
(usedval) = 0; \
(lval) = __low; \
} else { \
(usedval) = 1; \
(dval) = (double)(a) * (double)(b); \
} \
} while (0)
# else
# define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
zend_long __lres = (a) * (b); \
long double __dres = (long double)(a) * (long double)(b); \
long double __delta = (long double) __lres - __dres; \
if ( ((usedval) = (( __dres + __delta ) != __dres))) { \
(dval) = __dres; \
} else { \
(lval) = __lres; \
} \
} while (0)
# endif
#elif defined(__powerpc64__) && defined(__GNUC__)
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
long __low, __high; \
__asm__("mulld %0,%2,%3\n\t" \
"mulhd %1,%2,%3\n" \
: "=&r"(__low), "=&r"(__high) \
: "r"(a), "r"(b)); \
if ((__low >> 63) != __high) { \
(dval) = (double) (a) * (double) (b); \
(usedval) = 1; \
} else { \
(lval) = __low; \
(usedval) = 0; \
} \
} while (0)
#elif SIZEOF_ZEND_LONG == 4
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
int64_t __result = (int64_t) (a) * (int64_t) (b); \
if (__result > ZEND_LONG_MAX || __result < ZEND_LONG_MIN) { \
(dval) = (double) __result; \
(usedval) = 1; \
} else { \
(lval) = (long) __result; \
(usedval) = 0; \
} \
} while (0)
#else
#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
long __lres = (a) * (b); \
long double __dres = (long double)(a) * (long double)(b); \
long double __delta = (long double) __lres - __dres; \
if ( ((usedval) = (( __dres + __delta ) != __dres))) { \
(dval) = __dres; \
} else { \
(lval) = __lres; \
} \
} while (0)
#endif
#if defined(__GNUC__) && (defined(__native_client__) || defined(i386))
static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, bool *overflow)
{
size_t res = nmemb;
size_t m_overflow = 0;
if (ZEND_CONST_COND(offset == 0, 0)) {
__asm__ ("mull %3\n\tadcl $0,%1"
: "=&a"(res), "=&d" (m_overflow)
: "%0"(res),
"rm"(size));
} else {
__asm__ ("mull %3\n\taddl %4,%0\n\tadcl $0,%1"
: "=&a"(res), "=&d" (m_overflow)
: "%0"(res),
"rm"(size),
"rm"(offset));
}
if (UNEXPECTED(m_overflow)) {
*overflow = 1;
return 0;
}
*overflow = 0;
return res;
}
#elif defined(__GNUC__) && defined(__x86_64__)
static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, bool *overflow)
{
size_t res = nmemb;
zend_ulong m_overflow = 0;
#ifdef __ILP32__ /* x32 */
# define LP_SUFF "l"
#else /* amd64 */
# define LP_SUFF "q"
#endif
if (ZEND_CONST_COND(offset == 0, 0)) {
__asm__ ("mul" LP_SUFF " %3\n\t"
"adc $0,%1"
: "=&a"(res), "=&d" (m_overflow)
: "%0"(res),
"rm"(size));
} else {
__asm__ ("mul" LP_SUFF " %3\n\t"
"add %4,%0\n\t"
"adc $0,%1"
: "=&a"(res), "=&d" (m_overflow)
: "%0"(res),
"rm"(size),
"rm"(offset));
}
#undef LP_SUFF
if (UNEXPECTED(m_overflow)) {
*overflow = 1;
return 0;
}
*overflow = 0;
return res;
}
#elif defined(__GNUC__) && defined(__arm__)
static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, bool *overflow)
{
size_t res;
zend_ulong m_overflow;
__asm__ ("umlal %0,%1,%2,%3"
: "=r"(res), "=r"(m_overflow)
: "r"(nmemb),
"r"(size),
"0"(offset),
"1"(0));
if (UNEXPECTED(m_overflow)) {
*overflow = 1;
return 0;
}
*overflow = 0;
return res;
}
#elif defined(__GNUC__) && defined(__aarch64__)
static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, bool *overflow)
{
size_t res;
zend_ulong m_overflow;
__asm__ ("mul %0,%2,%3\n\tumulh %1,%2,%3\n\tadds %0,%0,%4\n\tadc %1,%1,xzr"
: "=&r"(res), "=&r"(m_overflow)
: "r"(nmemb),
"r"(size),
"r"(offset));
if (UNEXPECTED(m_overflow)) {
*overflow = 1;
return 0;
}
*overflow = 0;
return res;
}
#elif defined(__GNUC__) && defined(__powerpc64__)
static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, bool *overflow)
{
size_t res;
unsigned long m_overflow;
__asm__ ("mulld %0,%2,%3\n\t"
"mulhdu %1,%2,%3\n\t"
"addc %0,%0,%4\n\t"
"addze %1,%1\n"
: "=&r"(res), "=&r"(m_overflow)
: "r"(nmemb),
"r"(size),
"r"(offset));
if (UNEXPECTED(m_overflow)) {
*overflow = 1;
return 0;
}
*overflow = 0;
return res;
}
#elif SIZEOF_SIZE_T == 4
static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, bool *overflow)
{
uint64_t res = (uint64_t) nmemb * (uint64_t) size + (uint64_t) offset;
if (UNEXPECTED(res > UINT64_C(0xFFFFFFFF))) {
*overflow = 1;
return 0;
}
*overflow = 0;
return (size_t) res;
}
#else
static zend_always_inline size_t zend_safe_address(size_t nmemb, size_t size, size_t offset, bool *overflow)
{
size_t res = nmemb * size + offset;
double _d = (double)nmemb * (double)size + (double)offset;
double _delta = (double)res - _d;
if (UNEXPECTED((_d + _delta ) != _d)) {
*overflow = 1;
return 0;
}
*overflow = 0;
return res;
}
#endif
static zend_always_inline size_t zend_safe_address_guarded(size_t nmemb, size_t size, size_t offset)
{
bool overflow;
size_t ret = zend_safe_address(nmemb, size, offset, &overflow);
if (UNEXPECTED(overflow)) {
zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (%zu * %zu + %zu)", nmemb, size, offset);
return 0;
}
return ret;
}
/* A bit more generic version of the same */
static zend_always_inline size_t zend_safe_addmult(size_t nmemb, size_t size, size_t offset, const char *message)
{
bool overflow;
size_t ret = zend_safe_address(nmemb, size, offset, &overflow);
if (UNEXPECTED(overflow)) {
zend_error_noreturn(E_ERROR, "Possible integer overflow in %s (%zu * %zu + %zu)", message, nmemb, size, offset);
return 0;
}
return ret;
}
#endif /* ZEND_MULTIPLY_H */