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#include <util/system/info.h>
#include <util/system/defaults.h>
#if defined(_win_)
#include <util/system/winint.h>
#elif defined(_unix_)
#include <sys/types.h>
#include <sys/mman.h>
#ifndef MAP_NOCORE
#define MAP_NOCORE 0
#endif
#else
#error todo
#endif
#include "remmap.h"
static const size_t REMMAP_PAGESIZE = NSystemInfo::GetPageSize();
#if defined(_unix_)
TRemmapAllocation::TRemmapAllocation()
: Ptr_(nullptr)
, Size_(0)
{
}
TRemmapAllocation::TRemmapAllocation(size_t size, char* base)
: Ptr_(nullptr)
, Size_(0)
{
Alloc(size, base);
}
char* TRemmapAllocation::Alloc(size_t size, char* base) {
assert(Ptr_ == nullptr);
if (!size)
return nullptr;
const size_t HUGESIZE = size_t(16) << 30;
Ptr_ = CommonMMap(HUGESIZE, base);
if (Ptr_ != (char*)MAP_FAILED)
munmap((void*)Ptr_, HUGESIZE);
else
Ptr_ = nullptr;
Ptr_ = CommonMMap(AlignUp(size, REMMAP_PAGESIZE), Ptr_);
if (Ptr_ == (char*)MAP_FAILED)
Ptr_ = nullptr;
Size_ = Ptr_ ? size : 0;
return Ptr_;
}
char* TRemmapAllocation::Realloc(size_t newsize) {
if (Ptr_ == nullptr)
return Alloc(newsize);
size_t realSize = AlignUp(Size_, REMMAP_PAGESIZE);
size_t needSize = AlignUp(newsize, REMMAP_PAGESIZE);
if (needSize > realSize) {
char* part = Ptr_ + realSize;
char* bunch = CommonMMap(needSize - realSize, part);
if (bunch != (char*)MAP_FAILED && bunch != part)
munmap(bunch, needSize - realSize);
if (bunch == (char*)MAP_FAILED || bunch != part)
return FullRealloc(newsize);
} else if (needSize < realSize)
munmap(Ptr_ + needSize, realSize - needSize);
if ((Size_ = newsize) == 0)
Ptr_ = nullptr;
return Ptr_;
}
void TRemmapAllocation::Dealloc() {
if (Ptr_ != nullptr)
munmap(Ptr_, AlignUp(Size_, REMMAP_PAGESIZE));
Ptr_ = nullptr;
Size_ = 0;
}
char* TRemmapAllocation::FullRealloc(size_t newsize) {
char* newPtr = CommonMMap(newsize);
Y_ABORT_UNLESS(newPtr != MAP_FAILED, "mmap failed");
size_t useful = Min(Size_, newsize), cur = 0;
for (; cur + REMMAP_PAGESIZE < useful; cur += REMMAP_PAGESIZE) {
memcpy((void*)&newPtr[cur], (void*)&Ptr_[cur], REMMAP_PAGESIZE);
munmap((void*)&Ptr_[cur], REMMAP_PAGESIZE);
}
memcpy((void*)&newPtr[cur], (void*)&Ptr_[cur], useful - cur);
munmap((void*)&Ptr_[cur], AlignUp(Size_ - cur, REMMAP_PAGESIZE));
Size_ = newsize;
return (Ptr_ = newPtr);
}
inline char* TRemmapAllocation::CommonMMap(size_t size, char* base) {
return (char*)mmap((void*)base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
}
#else
TRemmapAllocation::TRemmapAllocation()
: Allocation_(0, false, NULL)
{
}
TRemmapAllocation::TRemmapAllocation(size_t size, char* base)
: Allocation_(size, false, (void*)base)
{
}
char* TRemmapAllocation::Alloc(size_t size, char* base) {
return (char*)Allocation_.Alloc(size, (void*)base);
}
char* TRemmapAllocation::Realloc(size_t newsize) {
return FullRealloc(newsize);
}
void TRemmapAllocation::Dealloc() {
Allocation_.Dealloc();
}
char* TRemmapAllocation::FullRealloc(size_t newsize) {
TMappedAllocation other(newsize);
memcpy(other.Ptr(), Allocation_.Ptr(), Min(other.MappedSize(), Allocation_.MappedSize()));
Allocation_.swap(other);
return Data();
}
#endif
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