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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"
namespace llvm {
namespace orc {
MemoryMapper::~MemoryMapper() {}
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);
for (auto &Segment : AI.Segments) {
auto Base = AI.MappingBase + Segment.Offset;
auto Size = Segment.ContentSize + Segment.ZeroFillSize;
if (Base < MinAddr)
MinAddr = Base;
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);
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));
}
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());
}
} // namespace orc
} // namespace llvm
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