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llvm-project/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp

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//===- MemoryMapper.cpp - Cross-process memory mapper ------------*- C++ -*-==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/MemoryMapper.h"
#include "llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h"
#include "llvm/Support/WindowsError.h"
#include <algorithm>
#if defined(LLVM_ON_UNIX) && !defined(__ANDROID__)
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#elif defined(_WIN32)
#include <windows.h>
#endif
namespace llvm {
namespace orc {
MemoryMapper::~MemoryMapper() {}
InProcessMemoryMapper::InProcessMemoryMapper(size_t PageSize)
: PageSize(PageSize) {}
Expected<std::unique_ptr<InProcessMemoryMapper>>
InProcessMemoryMapper::Create() {
auto PageSize = sys::Process::getPageSize();
if (!PageSize)
return PageSize.takeError();
return std::make_unique<InProcessMemoryMapper>(*PageSize);
}
void InProcessMemoryMapper::reserve(size_t NumBytes,
OnReservedFunction OnReserved) {
std::error_code EC;
auto MB = sys::Memory::allocateMappedMemory(
NumBytes, nullptr, sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC);
if (EC)
return OnReserved(errorCodeToError(EC));
{
std::lock_guard<std::mutex> Lock(Mutex);
Reservations[MB.base()].Size = MB.allocatedSize();
}
OnReserved(
ExecutorAddrRange(ExecutorAddr::fromPtr(MB.base()), MB.allocatedSize()));
}
char *InProcessMemoryMapper::prepare(ExecutorAddr Addr, size_t ContentSize) {
return Addr.toPtr<char *>();
}
void InProcessMemoryMapper::initialize(MemoryMapper::AllocInfo &AI,
OnInitializedFunction OnInitialized) {
ExecutorAddr MinAddr(~0ULL);
ExecutorAddr MaxAddr(0);
for (auto &Segment : AI.Segments) {
auto Base = AI.MappingBase + Segment.Offset;
auto Size = Segment.ContentSize + Segment.ZeroFillSize;
if (Base < MinAddr)
MinAddr = Base;
if (Base + Size > MaxAddr)
MaxAddr = Base + Size;
std::memset((Base + Segment.ContentSize).toPtr<void *>(), 0,
Segment.ZeroFillSize);
if (auto EC = sys::Memory::protectMappedMemory({Base.toPtr<void *>(), Size},
Segment.Prot)) {
return OnInitialized(errorCodeToError(EC));
}
if (Segment.Prot & sys::Memory::MF_EXEC)
sys::Memory::InvalidateInstructionCache(Base.toPtr<void *>(), Size);
}
auto DeinitializeActions = shared::runFinalizeActions(AI.Actions);
if (!DeinitializeActions)
return OnInitialized(DeinitializeActions.takeError());
{
std::lock_guard<std::mutex> Lock(Mutex);
// This is the maximum range whose permission have been possibly modified
Allocations[MinAddr].Size = MaxAddr - MinAddr;
Allocations[MinAddr].DeinitializationActions =
std::move(*DeinitializeActions);
Reservations[AI.MappingBase.toPtr<void *>()].Allocations.push_back(MinAddr);
}
OnInitialized(MinAddr);
}
void InProcessMemoryMapper::deinitialize(
ArrayRef<ExecutorAddr> Bases,
MemoryMapper::OnDeinitializedFunction OnDeinitialized) {
Error AllErr = Error::success();
{
std::lock_guard<std::mutex> Lock(Mutex);
for (auto Base : Bases) {
if (Error Err = shared::runDeallocActions(
Allocations[Base].DeinitializationActions)) {
AllErr = joinErrors(std::move(AllErr), std::move(Err));
}
// Reset protections to read/write so the area can be reused
if (auto EC = sys::Memory::protectMappedMemory(
{Base.toPtr<void *>(), Allocations[Base].Size},
sys::Memory::ProtectionFlags::MF_READ |
sys::Memory::ProtectionFlags::MF_WRITE)) {
AllErr = joinErrors(std::move(AllErr), errorCodeToError(EC));
}
Allocations.erase(Base);
}
}
OnDeinitialized(std::move(AllErr));
}
void InProcessMemoryMapper::release(ArrayRef<ExecutorAddr> Bases,
OnReleasedFunction OnReleased) {
Error Err = Error::success();
for (auto Base : Bases) {
std::vector<ExecutorAddr> AllocAddrs;
size_t Size;
{
std::lock_guard<std::mutex> Lock(Mutex);
auto &R = Reservations[Base.toPtr<void *>()];
Size = R.Size;
AllocAddrs.swap(R.Allocations);
}
// deinitialize sub allocations
std::promise<MSVCPError> P;
auto F = P.get_future();
deinitialize(AllocAddrs, [&](Error Err) { P.set_value(std::move(Err)); });
if (Error E = F.get()) {
Err = joinErrors(std::move(Err), std::move(E));
}
// free the memory
auto MB = sys::MemoryBlock(Base.toPtr<void *>(), Size);
auto EC = sys::Memory::releaseMappedMemory(MB);
if (EC) {
Err = joinErrors(std::move(Err), errorCodeToError(EC));
}
std::lock_guard<std::mutex> Lock(Mutex);
Reservations.erase(Base.toPtr<void *>());
}
OnReleased(std::move(Err));
}
InProcessMemoryMapper::~InProcessMemoryMapper() {
std::vector<ExecutorAddr> ReservationAddrs;
{
std::lock_guard<std::mutex> Lock(Mutex);
ReservationAddrs.reserve(Reservations.size());
for (const auto &R : Reservations) {
ReservationAddrs.push_back(ExecutorAddr::fromPtr(R.getFirst()));
}
}
std::promise<MSVCPError> P;
auto F = P.get_future();
release(ReservationAddrs, [&](Error Err) { P.set_value(std::move(Err)); });
cantFail(F.get());
}
// SharedMemoryMapper
SharedMemoryMapper::SharedMemoryMapper(ExecutorProcessControl &EPC,
SymbolAddrs SAs, size_t PageSize)
: EPC(EPC), SAs(SAs), PageSize(PageSize) {
#if (!defined(LLVM_ON_UNIX) || defined(__ANDROID__)) && !defined(_WIN32)
llvm_unreachable("SharedMemoryMapper is not supported on this platform yet");
#endif
}
Expected<std::unique_ptr<SharedMemoryMapper>>
SharedMemoryMapper::Create(ExecutorProcessControl &EPC, SymbolAddrs SAs) {
#if (defined(LLVM_ON_UNIX) && !defined(__ANDROID__)) || defined(_WIN32)
auto PageSize = sys::Process::getPageSize();
if (!PageSize)
return PageSize.takeError();
return std::make_unique<SharedMemoryMapper>(EPC, SAs, *PageSize);
#else
return make_error<StringError>(
"SharedMemoryMapper is not supported on this platform yet",
inconvertibleErrorCode());
#endif
}
void SharedMemoryMapper::reserve(size_t NumBytes,
OnReservedFunction OnReserved) {
#if (defined(LLVM_ON_UNIX) && !defined(__ANDROID__)) || defined(_WIN32)
EPC.callSPSWrapperAsync<
rt::SPSExecutorSharedMemoryMapperServiceReserveSignature>(
SAs.Reserve,
[this, NumBytes, OnReserved = std::move(OnReserved)](
Error SerializationErr,
Expected<std::pair<ExecutorAddr, std::string>> Result) mutable {
if (SerializationErr) {
cantFail(Result.takeError());
return OnReserved(std::move(SerializationErr));
}
if (!Result)
return OnReserved(Result.takeError());
ExecutorAddr RemoteAddr;
std::string SharedMemoryName;
std::tie(RemoteAddr, SharedMemoryName) = std::move(*Result);
void *LocalAddr = nullptr;
#if defined(LLVM_ON_UNIX)
int SharedMemoryFile = shm_open(SharedMemoryName.c_str(), O_RDWR, 0700);
if (SharedMemoryFile < 0) {
return OnReserved(errorCodeToError(
std::error_code(errno, std::generic_category())));
}
// this prevents other processes from accessing it by name
shm_unlink(SharedMemoryName.c_str());
LocalAddr = mmap(nullptr, NumBytes, PROT_READ | PROT_WRITE, MAP_SHARED,
SharedMemoryFile, 0);
if (LocalAddr == MAP_FAILED) {
return OnReserved(errorCodeToError(
std::error_code(errno, std::generic_category())));
}
close(SharedMemoryFile);
#elif defined(_WIN32)
std::wstring WideSharedMemoryName(SharedMemoryName.begin(),
SharedMemoryName.end());
HANDLE SharedMemoryFile = OpenFileMappingW(
FILE_MAP_ALL_ACCESS, FALSE, WideSharedMemoryName.c_str());
if (!SharedMemoryFile)
return OnReserved(errorCodeToError(mapWindowsError(GetLastError())));
LocalAddr =
MapViewOfFile(SharedMemoryFile, FILE_MAP_ALL_ACCESS, 0, 0, 0);
if (!LocalAddr) {
CloseHandle(SharedMemoryFile);
return OnReserved(errorCodeToError(mapWindowsError(GetLastError())));
}
CloseHandle(SharedMemoryFile);
#endif
{
std::lock_guard<std::mutex> Lock(Mutex);
Reservations.insert({RemoteAddr, {LocalAddr, NumBytes}});
}
OnReserved(ExecutorAddrRange(RemoteAddr, NumBytes));
},
SAs.Instance, static_cast<uint64_t>(NumBytes));
#else
OnReserved(make_error<StringError>(
"SharedMemoryMapper is not supported on this platform yet",
inconvertibleErrorCode()));
#endif
}
char *SharedMemoryMapper::prepare(ExecutorAddr Addr, size_t ContentSize) {
auto R = Reservations.upper_bound(Addr);
assert(R != Reservations.begin() && "Attempt to prepare unknown range");
R--;
ExecutorAddrDiff Offset = Addr - R->first;
return static_cast<char *>(R->second.LocalAddr) + Offset;
}
void SharedMemoryMapper::initialize(MemoryMapper::AllocInfo &AI,
OnInitializedFunction OnInitialized) {
auto Reservation = std::lower_bound(
Reservations.rbegin(), Reservations.rend(), AI.MappingBase,
[](const auto &A, const auto &B) { return A.first > B; });
assert(Reservation != Reservations.rend() &&
"Attempt to initialize unreserved range");
tpctypes::SharedMemoryFinalizeRequest FR;
AI.Actions.swap(FR.Actions);
FR.Segments.reserve(AI.Segments.size());
for (auto Segment : AI.Segments) {
char *Base =
static_cast<char *>(Reservation->second.LocalAddr) + Segment.Offset;
std::memset(Base + Segment.ContentSize, 0, Segment.ZeroFillSize);
tpctypes::SharedMemorySegFinalizeRequest SegReq;
SegReq.Prot = tpctypes::toWireProtectionFlags(
static_cast<sys::Memory::ProtectionFlags>(Segment.Prot));
SegReq.Addr = AI.MappingBase + Segment.Offset;
SegReq.Size = Segment.ContentSize + Segment.ZeroFillSize;
FR.Segments.push_back(SegReq);
}
EPC.callSPSWrapperAsync<
rt::SPSExecutorSharedMemoryMapperServiceInitializeSignature>(
SAs.Initialize,
[OnInitialized = std::move(OnInitialized)](
Error SerializationErr, Expected<ExecutorAddr> Result) mutable {
if (SerializationErr) {
cantFail(Result.takeError());
return OnInitialized(std::move(SerializationErr));
}
OnInitialized(std::move(Result));
},
SAs.Instance, Reservation->first, std::move(FR));
}
void SharedMemoryMapper::deinitialize(
ArrayRef<ExecutorAddr> Allocations,
MemoryMapper::OnDeinitializedFunction OnDeinitialized) {
EPC.callSPSWrapperAsync<
rt::SPSExecutorSharedMemoryMapperServiceDeinitializeSignature>(
SAs.Deinitialize,
[OnDeinitialized = std::move(OnDeinitialized)](Error SerializationErr,
Error Result) mutable {
if (SerializationErr) {
cantFail(std::move(Result));
return OnDeinitialized(std::move(SerializationErr));
}
OnDeinitialized(std::move(Result));
},
SAs.Instance, Allocations);
}
void SharedMemoryMapper::release(ArrayRef<ExecutorAddr> Bases,
OnReleasedFunction OnReleased) {
#if (defined(LLVM_ON_UNIX) && !defined(__ANDROID__)) || defined(_WIN32)
Error Err = Error::success();
{
std::lock_guard<std::mutex> Lock(Mutex);
for (auto Base : Bases) {
#if defined(LLVM_ON_UNIX)
if (munmap(Reservations[Base].LocalAddr, Reservations[Base].Size) != 0)
Err = joinErrors(std::move(Err), errorCodeToError(std::error_code(
errno, std::generic_category())));
#elif defined(_WIN32)
if (!UnmapViewOfFile(Reservations[Base].LocalAddr))
Err = joinErrors(std::move(Err),
errorCodeToError(mapWindowsError(GetLastError())));
#endif
Reservations.erase(Base);
}
}
EPC.callSPSWrapperAsync<
rt::SPSExecutorSharedMemoryMapperServiceReleaseSignature>(
SAs.Release,
[OnReleased = std::move(OnReleased),
Err = std::move(Err)](Error SerializationErr, Error Result) mutable {
if (SerializationErr) {
cantFail(std::move(Result));
return OnReleased(
joinErrors(std::move(Err), std::move(SerializationErr)));
}
return OnReleased(joinErrors(std::move(Err), std::move(Result)));
},
SAs.Instance, Bases);
#else
OnReleased(make_error<StringError>(
"SharedMemoryMapper is not supported on this platform yet",
inconvertibleErrorCode()));
#endif
}
SharedMemoryMapper::~SharedMemoryMapper() {
for (const auto R : Reservations) {
#if defined(LLVM_ON_UNIX) && !defined(__ANDROID__)
munmap(R.second.LocalAddr, R.second.Size);
#elif defined(_WIN32)
UnmapViewOfFile(R.second.LocalAddr);
#endif
}
}
} // namespace orc
} // namespace llvm
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