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//===-- RemoteJITUtils.h - Utilities for remote-JITing with LLI -*- 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
//
//===----------------------------------------------------------------------===//
//
// Utilities for remote-JITing with LLI.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLI_REMOTEJITUTILS_H
#define LLVM_TOOLS_LLI_REMOTEJITUTILS_H
#include "llvm/ExecutionEngine/Orc/RPC/RawByteChannel.h"
#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
#include <mutex>
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
#else
#include <io.h>
#endif
/// RPC channel that reads from and writes from file descriptors.
class FDRawChannel final : public llvm::orc::rpc::RawByteChannel {
public:
FDRawChannel(int InFD, int OutFD) : InFD(InFD), OutFD(OutFD) {}
llvm::Error readBytes(char *Dst, unsigned Size) override {
assert(Dst && "Attempt to read into null.");
ssize_t Completed = 0;
while (Completed < static_cast<ssize_t>(Size)) {
ssize_t Read = ::read(InFD, Dst + Completed, Size - Completed);
if (Read <= 0) {
auto ErrNo = errno;
if (ErrNo == EAGAIN || ErrNo == EINTR)
continue;
else
return llvm::errorCodeToError(
std::error_code(errno, std::generic_category()));
}
Completed += Read;
}
return llvm::Error::success();
}
llvm::Error appendBytes(const char *Src, unsigned Size) override {
assert(Src && "Attempt to append from null.");
ssize_t Completed = 0;
while (Completed < static_cast<ssize_t>(Size)) {
ssize_t Written = ::write(OutFD, Src + Completed, Size - Completed);
if (Written < 0) {
auto ErrNo = errno;
if (ErrNo == EAGAIN || ErrNo == EINTR)
continue;
else
return llvm::errorCodeToError(
std::error_code(errno, std::generic_category()));
}
Completed += Written;
}
return llvm::Error::success();
}
llvm::Error send() override { return llvm::Error::success(); }
private:
int InFD, OutFD;
};
// launch the remote process (see lli.cpp) and return a channel to it.
std::unique_ptr<FDRawChannel> launchRemote();
namespace llvm {
// ForwardingMM - Adapter to connect MCJIT to Orc's Remote
// memory manager.
class ForwardingMemoryManager : public llvm::RTDyldMemoryManager {
public:
void setMemMgr(std::unique_ptr<RuntimeDyld::MemoryManager> MemMgr) {
this->MemMgr = std::move(MemMgr);
}
void setResolver(std::shared_ptr<LegacyJITSymbolResolver> Resolver) {
this->Resolver = std::move(Resolver);
}
uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID,
StringRef SectionName) override {
return MemMgr->allocateCodeSection(Size, Alignment, SectionID, SectionName);
}
uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID, StringRef SectionName,
bool IsReadOnly) override {
return MemMgr->allocateDataSection(Size, Alignment, SectionID, SectionName,
IsReadOnly);
}
void reserveAllocationSpace(uintptr_t CodeSize, uint32_t CodeAlign,
uintptr_t RODataSize, uint32_t RODataAlign,
uintptr_t RWDataSize,
uint32_t RWDataAlign) override {
MemMgr->reserveAllocationSpace(CodeSize, CodeAlign, RODataSize, RODataAlign,
RWDataSize, RWDataAlign);
}
bool needsToReserveAllocationSpace() override {
return MemMgr->needsToReserveAllocationSpace();
}
void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr,
size_t Size) override {
MemMgr->registerEHFrames(Addr, LoadAddr, Size);
}
void deregisterEHFrames() override {
MemMgr->deregisterEHFrames();
}
bool finalizeMemory(std::string *ErrMsg = nullptr) override {
return MemMgr->finalizeMemory(ErrMsg);
}
void notifyObjectLoaded(RuntimeDyld &RTDyld,
const object::ObjectFile &Obj) override {
MemMgr->notifyObjectLoaded(RTDyld, Obj);
}
// Don't hide the sibling notifyObjectLoaded from RTDyldMemoryManager.
using RTDyldMemoryManager::notifyObjectLoaded;
JITSymbol findSymbol(const std::string &Name) override {
return Resolver->findSymbol(Name);
}
JITSymbol
findSymbolInLogicalDylib(const std::string &Name) override {
return Resolver->findSymbolInLogicalDylib(Name);
}
private:
std::unique_ptr<RuntimeDyld::MemoryManager> MemMgr;
std::shared_ptr<LegacyJITSymbolResolver> Resolver;
};
}
#endif
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