forked from OSchip/llvm-project
264 lines
6.7 KiB
C++
264 lines
6.7 KiB
C++
//===-- sanitizer_libc.cc -------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is shared between AddressSanitizer and ThreadSanitizer
|
|
// run-time libraries. See sanitizer_libc.h for details.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "sanitizer_allocator_internal.h"
|
|
#include "sanitizer_common.h"
|
|
#include "sanitizer_libc.h"
|
|
|
|
namespace __sanitizer {
|
|
|
|
s64 internal_atoll(const char *nptr) {
|
|
return internal_simple_strtoll(nptr, nullptr, 10);
|
|
}
|
|
|
|
void *internal_memchr(const void *s, int c, uptr n) {
|
|
const char *t = (const char *)s;
|
|
for (uptr i = 0; i < n; ++i, ++t)
|
|
if (*t == c)
|
|
return reinterpret_cast<void *>(const_cast<char *>(t));
|
|
return nullptr;
|
|
}
|
|
|
|
void *internal_memrchr(const void *s, int c, uptr n) {
|
|
const char *t = (const char *)s;
|
|
void *res = nullptr;
|
|
for (uptr i = 0; i < n; ++i, ++t) {
|
|
if (*t == c) res = reinterpret_cast<void *>(const_cast<char *>(t));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
int internal_memcmp(const void* s1, const void* s2, uptr n) {
|
|
const char *t1 = (const char *)s1;
|
|
const char *t2 = (const char *)s2;
|
|
for (uptr i = 0; i < n; ++i, ++t1, ++t2)
|
|
if (*t1 != *t2)
|
|
return *t1 < *t2 ? -1 : 1;
|
|
return 0;
|
|
}
|
|
|
|
void *internal_memcpy(void *dest, const void *src, uptr n) {
|
|
char *d = (char*)dest;
|
|
const char *s = (const char *)src;
|
|
for (uptr i = 0; i < n; ++i)
|
|
d[i] = s[i];
|
|
return dest;
|
|
}
|
|
|
|
void *internal_memmove(void *dest, const void *src, uptr n) {
|
|
char *d = (char*)dest;
|
|
const char *s = (const char *)src;
|
|
sptr i, signed_n = (sptr)n;
|
|
CHECK_GE(signed_n, 0);
|
|
if (d < s) {
|
|
for (i = 0; i < signed_n; ++i)
|
|
d[i] = s[i];
|
|
} else {
|
|
if (d > s && signed_n > 0)
|
|
for (i = signed_n - 1; i >= 0 ; --i) {
|
|
d[i] = s[i];
|
|
}
|
|
}
|
|
return dest;
|
|
}
|
|
|
|
// Semi-fast bzero for 16-aligned data. Still far from peak performance.
|
|
void internal_bzero_aligned16(void *s, uptr n) {
|
|
struct S16 { u64 a, b; } ALIGNED(16);
|
|
CHECK_EQ((reinterpret_cast<uptr>(s) | n) & 15, 0);
|
|
for (S16 *p = reinterpret_cast<S16*>(s), *end = p + n / 16; p < end; p++) {
|
|
p->a = p->b = 0;
|
|
// Make sure this does not become memset.
|
|
SanitizerBreakOptimization(nullptr);
|
|
}
|
|
}
|
|
|
|
void *internal_memset(void* s, int c, uptr n) {
|
|
// The next line prevents Clang from making a call to memset() instead of the
|
|
// loop below.
|
|
// FIXME: building the runtime with -ffreestanding is a better idea. However
|
|
// there currently are linktime problems due to PR12396.
|
|
char volatile *t = (char*)s;
|
|
for (uptr i = 0; i < n; ++i, ++t) {
|
|
*t = c;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
uptr internal_strcspn(const char *s, const char *reject) {
|
|
uptr i;
|
|
for (i = 0; s[i]; i++) {
|
|
if (internal_strchr(reject, s[i]))
|
|
return i;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
char* internal_strdup(const char *s) {
|
|
uptr len = internal_strlen(s);
|
|
char *s2 = (char*)InternalAlloc(len + 1);
|
|
internal_memcpy(s2, s, len);
|
|
s2[len] = 0;
|
|
return s2;
|
|
}
|
|
|
|
char* internal_strndup(const char *s, uptr n) {
|
|
uptr len = internal_strnlen(s, n);
|
|
char *s2 = (char*)InternalAlloc(len + 1);
|
|
internal_memcpy(s2, s, len);
|
|
s2[len] = 0;
|
|
return s2;
|
|
}
|
|
|
|
int internal_strcmp(const char *s1, const char *s2) {
|
|
while (true) {
|
|
unsigned c1 = *s1;
|
|
unsigned c2 = *s2;
|
|
if (c1 != c2) return (c1 < c2) ? -1 : 1;
|
|
if (c1 == 0) break;
|
|
s1++;
|
|
s2++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int internal_strncmp(const char *s1, const char *s2, uptr n) {
|
|
for (uptr i = 0; i < n; i++) {
|
|
unsigned c1 = *s1;
|
|
unsigned c2 = *s2;
|
|
if (c1 != c2) return (c1 < c2) ? -1 : 1;
|
|
if (c1 == 0) break;
|
|
s1++;
|
|
s2++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
char* internal_strchr(const char *s, int c) {
|
|
while (true) {
|
|
if (*s == (char)c)
|
|
return const_cast<char *>(s);
|
|
if (*s == 0)
|
|
return nullptr;
|
|
s++;
|
|
}
|
|
}
|
|
|
|
char *internal_strchrnul(const char *s, int c) {
|
|
char *res = internal_strchr(s, c);
|
|
if (!res)
|
|
res = const_cast<char *>(s) + internal_strlen(s);
|
|
return res;
|
|
}
|
|
|
|
char *internal_strrchr(const char *s, int c) {
|
|
const char *res = nullptr;
|
|
for (uptr i = 0; s[i]; i++) {
|
|
if (s[i] == c) res = s + i;
|
|
}
|
|
return const_cast<char *>(res);
|
|
}
|
|
|
|
uptr internal_strlen(const char *s) {
|
|
uptr i = 0;
|
|
while (s[i]) i++;
|
|
return i;
|
|
}
|
|
|
|
char *internal_strncat(char *dst, const char *src, uptr n) {
|
|
uptr len = internal_strlen(dst);
|
|
uptr i;
|
|
for (i = 0; i < n && src[i]; i++)
|
|
dst[len + i] = src[i];
|
|
dst[len + i] = 0;
|
|
return dst;
|
|
}
|
|
|
|
char *internal_strncpy(char *dst, const char *src, uptr n) {
|
|
uptr i;
|
|
for (i = 0; i < n && src[i]; i++)
|
|
dst[i] = src[i];
|
|
internal_memset(dst + i, '\0', n - i);
|
|
return dst;
|
|
}
|
|
|
|
uptr internal_strnlen(const char *s, uptr maxlen) {
|
|
uptr i = 0;
|
|
while (i < maxlen && s[i]) i++;
|
|
return i;
|
|
}
|
|
|
|
char *internal_strstr(const char *haystack, const char *needle) {
|
|
// This is O(N^2), but we are not using it in hot places.
|
|
uptr len1 = internal_strlen(haystack);
|
|
uptr len2 = internal_strlen(needle);
|
|
if (len1 < len2) return nullptr;
|
|
for (uptr pos = 0; pos <= len1 - len2; pos++) {
|
|
if (internal_memcmp(haystack + pos, needle, len2) == 0)
|
|
return const_cast<char *>(haystack) + pos;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
s64 internal_simple_strtoll(const char *nptr, char **endptr, int base) {
|
|
CHECK_EQ(base, 10);
|
|
while (IsSpace(*nptr)) nptr++;
|
|
int sgn = 1;
|
|
u64 res = 0;
|
|
bool have_digits = false;
|
|
char *old_nptr = const_cast<char *>(nptr);
|
|
if (*nptr == '+') {
|
|
sgn = 1;
|
|
nptr++;
|
|
} else if (*nptr == '-') {
|
|
sgn = -1;
|
|
nptr++;
|
|
}
|
|
while (IsDigit(*nptr)) {
|
|
res = (res <= UINT64_MAX / 10) ? res * 10 : UINT64_MAX;
|
|
int digit = ((*nptr) - '0');
|
|
res = (res <= UINT64_MAX - digit) ? res + digit : UINT64_MAX;
|
|
have_digits = true;
|
|
nptr++;
|
|
}
|
|
if (endptr) {
|
|
*endptr = (have_digits) ? const_cast<char *>(nptr) : old_nptr;
|
|
}
|
|
if (sgn > 0) {
|
|
return (s64)(Min((u64)INT64_MAX, res));
|
|
} else {
|
|
return (res > INT64_MAX) ? INT64_MIN : ((s64)res * -1);
|
|
}
|
|
}
|
|
|
|
bool mem_is_zero(const char *beg, uptr size) {
|
|
CHECK_LE(size, 1ULL << FIRST_32_SECOND_64(30, 40)); // Sanity check.
|
|
const char *end = beg + size;
|
|
uptr *aligned_beg = (uptr *)RoundUpTo((uptr)beg, sizeof(uptr));
|
|
uptr *aligned_end = (uptr *)RoundDownTo((uptr)end, sizeof(uptr));
|
|
uptr all = 0;
|
|
// Prologue.
|
|
for (const char *mem = beg; mem < (char*)aligned_beg && mem < end; mem++)
|
|
all |= *mem;
|
|
// Aligned loop.
|
|
for (; aligned_beg < aligned_end; aligned_beg++)
|
|
all |= *aligned_beg;
|
|
// Epilogue.
|
|
if ((char*)aligned_end >= beg)
|
|
for (const char *mem = (char*)aligned_end; mem < end; mem++)
|
|
all |= *mem;
|
|
return all == 0;
|
|
}
|
|
|
|
} // namespace __sanitizer
|