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osutils.cpp
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osutils.cpp
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// [AsmJit]
// Complete x86/x64 JIT and Remote Assembler for C++.
//
// [License]
// Zlib - See LICENSE.md file in the package.
// [Export]
#define ASMJIT_EXPORTS
// [Dependencies]
#include "../base/osutils.h"
#include "../base/utils.h"
#if ASMJIT_OS_POSIX
# include <sys/types.h>
# include <sys/mman.h>
# include <time.h>
# include <unistd.h>
#endif // ASMJIT_OS_POSIX
#if ASMJIT_OS_MAC
# include <mach/mach_time.h>
#endif // ASMJIT_OS_MAC
#if ASMJIT_OS_WINDOWS
# if defined(_MSC_VER) && _MSC_VER >= 1400
# include <intrin.h>
# else
# define _InterlockedCompareExchange InterlockedCompareExchange
# endif // _MSC_VER
#endif // ASMJIT_OS_WINDOWS
// [Api-Begin]
#include "../asmjit_apibegin.h"
namespace asmjit {
// ============================================================================
// [asmjit::OSUtils - Virtual Memory]
// ============================================================================
// Windows specific implementation using `VirtualAllocEx` and `VirtualFree`.
#if ASMJIT_OS_WINDOWS
static ASMJIT_NOINLINE const VMemInfo& OSUtils_GetVMemInfo() noexcept {
static VMemInfo vmi;
if (ASMJIT_UNLIKELY(!vmi.hCurrentProcess)) {
SYSTEM_INFO info;
::GetSystemInfo(&info);
vmi.pageSize = Utils::alignToPowerOf2<uint32_t>(info.dwPageSize);
vmi.pageGranularity = info.dwAllocationGranularity;
vmi.hCurrentProcess = ::GetCurrentProcess();
}
return vmi;
};
VMemInfo OSUtils::getVirtualMemoryInfo() noexcept { return OSUtils_GetVMemInfo(); }
void* OSUtils::allocVirtualMemory(size_t size, size_t* allocated, uint32_t flags) noexcept {
return allocProcessMemory(static_cast<HANDLE>(0), size, allocated, flags);
}
Error OSUtils::releaseVirtualMemory(void* p, size_t size) noexcept {
return releaseProcessMemory(static_cast<HANDLE>(0), p, size);
}
void* OSUtils::allocProcessMemory(HANDLE hProcess, size_t size, size_t* allocated, uint32_t flags) noexcept {
if (size == 0)
return nullptr;
const VMemInfo& vmi = OSUtils_GetVMemInfo();
if (!hProcess) hProcess = vmi.hCurrentProcess;
// VirtualAllocEx rounds the allocated size to a page size automatically,
// but we need the `alignedSize` so we can store the real allocated size
// into `allocated` output.
size_t alignedSize = Utils::alignTo(size, vmi.pageSize);
// Windows XP SP2 / Vista+ allow data-execution-prevention (DEP).
DWORD protectFlags = 0;
if (flags & kVMExecutable)
protectFlags |= (flags & kVMWritable) ? PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ;
else
protectFlags |= (flags & kVMWritable) ? PAGE_READWRITE : PAGE_READONLY;
LPVOID mBase = ::VirtualAllocEx(hProcess, nullptr, alignedSize, MEM_COMMIT | MEM_RESERVE, protectFlags);
if (ASMJIT_UNLIKELY(!mBase)) return nullptr;
ASMJIT_ASSERT(Utils::isAligned<size_t>(reinterpret_cast<size_t>(mBase), vmi.pageSize));
if (allocated) *allocated = alignedSize;
return mBase;
}
Error OSUtils::releaseProcessMemory(HANDLE hProcess, void* p, size_t size) noexcept {
const VMemInfo& vmi = OSUtils_GetVMemInfo();
if (!hProcess) hProcess = vmi.hCurrentProcess;
if (ASMJIT_UNLIKELY(!::VirtualFreeEx(hProcess, p, 0, MEM_RELEASE)))
return DebugUtils::errored(kErrorInvalidState);
return kErrorOk;
}
#endif // ASMJIT_OS_WINDOWS
// Posix specific implementation using `mmap()` and `munmap()`.
#if ASMJIT_OS_POSIX
// Mac uses MAP_ANON instead of MAP_ANONYMOUS.
#if !defined(MAP_ANONYMOUS)
# define MAP_ANONYMOUS MAP_ANON
#endif // MAP_ANONYMOUS
static const VMemInfo& OSUtils_GetVMemInfo() noexcept {
static VMemInfo vmi;
if (ASMJIT_UNLIKELY(!vmi.pageSize)) {
size_t pageSize = ::getpagesize();
vmi.pageSize = pageSize;
vmi.pageGranularity = std::max<size_t>(pageSize, 65536);
}
return vmi;
};
VMemInfo OSUtils::getVirtualMemoryInfo() noexcept { return OSUtils_GetVMemInfo(); }
void* OSUtils::allocVirtualMemory(size_t size, size_t* allocated, uint32_t flags) noexcept {
const VMemInfo& vmi = OSUtils_GetVMemInfo();
size_t alignedSize = Utils::alignTo<size_t>(size, vmi.pageSize);
int protection = PROT_READ;
if (flags & kVMWritable ) protection |= PROT_WRITE;
if (flags & kVMExecutable) protection |= PROT_EXEC;
void* mbase = ::mmap(nullptr, alignedSize, protection, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (ASMJIT_UNLIKELY(mbase == MAP_FAILED)) return nullptr;
if (allocated) *allocated = alignedSize;
return mbase;
}
Error OSUtils::releaseVirtualMemory(void* p, size_t size) noexcept {
if (ASMJIT_UNLIKELY(::munmap(p, size) != 0))
return DebugUtils::errored(kErrorInvalidState);
return kErrorOk;
}
#endif // ASMJIT_OS_POSIX
// ============================================================================
// [asmjit::OSUtils - GetTickCount]
// ============================================================================
#if ASMJIT_OS_WINDOWS
static ASMJIT_INLINE uint32_t OSUtils_calcHiRes(const LARGE_INTEGER& now, double freq) noexcept {
return static_cast<uint32_t>(
(int64_t)(double(now.QuadPart) / freq) & 0xFFFFFFFF);
}
uint32_t OSUtils::getTickCount() noexcept {
static volatile uint32_t _hiResTicks;
static volatile double _hiResFreq;
do {
uint32_t hiResOk = _hiResTicks;
LARGE_INTEGER qpf, now;
// If for whatever reason this fails, bail to `GetTickCount()`.
if (!::QueryPerformanceCounter(&now)) break;
// Expected - if we ran through this at least once `hiResTicks` will be
// either 1 or 0xFFFFFFFF. If it's '1' then the Hi-Res counter is available
// and `QueryPerformanceCounter()` can be used.
if (hiResOk == 1) return OSUtils_calcHiRes(now, _hiResFreq);
// Hi-Res counter is not available, bail to `GetTickCount()`.
if (hiResOk != 0) break;
// Detect availability of Hi-Res counter, if not available, bail to `GetTickCount()`.
if (!::QueryPerformanceFrequency(&qpf)) {
_InterlockedCompareExchange((LONG*)&_hiResTicks, 0xFFFFFFFF, 0);
break;
}
double freq = double(qpf.QuadPart) / 1000.0;
_hiResFreq = freq;
_InterlockedCompareExchange((LONG*)&_hiResTicks, 1, 0);
return OSUtils_calcHiRes(now, freq);
} while (0);
return ::GetTickCount();
}
#elif ASMJIT_OS_MAC
uint32_t OSUtils::getTickCount() noexcept {
static mach_timebase_info_data_t _machTime;
// See Apple's QA1398.
if (ASMJIT_UNLIKELY(_machTime.denom == 0) || mach_timebase_info(&_machTime) != KERN_SUCCESS)
return 0;
// `mach_absolute_time()` returns nanoseconds, we want milliseconds.
uint64_t t = mach_absolute_time() / 1000000;
t = t * _machTime.numer / _machTime.denom;
return static_cast<uint32_t>(t & 0xFFFFFFFFU);
}
#elif defined(_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
uint32_t OSUtils::getTickCount() noexcept {
struct timespec ts;
if (ASMJIT_UNLIKELY(clock_gettime(CLOCK_MONOTONIC, &ts) != 0))
return 0;
uint64_t t = (uint64_t(ts.tv_sec ) * 1000) + (uint64_t(ts.tv_nsec) / 1000000);
return static_cast<uint32_t>(t & 0xFFFFFFFFU);
}
#else
#error "[asmjit] OSUtils::getTickCount() is not implemented for your target OS."
uint32_t OSUtils::getTickCount() noexcept { return 0; }
#endif
} // asmjit namespace
// [Api-End]
#include "../asmjit_apiend.h"