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//===- RemoteMemoryManager.h - LLI MCJIT recording memory manager ------===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This memory manager allocates local storage and keeps a record of each
// allocation. Iterators are provided for all data and code allocations.
#include "RemoteTarget.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ExecutionEngine/JITMemoryManager.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Memory.h"
#include <utility>
namespace llvm {
class RemoteMemoryManager : public JITMemoryManager {
// Notice that this structure takes ownership of the memory allocated.
struct Allocation {
Allocation() {}
Allocation(sys::MemoryBlock mb, unsigned a, bool code)
: MB(mb), Alignment(a), IsCode(code) {}
sys::MemoryBlock MB;
unsigned Alignment;
bool IsCode;
// This vector contains Allocation objects for all sections which we have
// allocated. This vector effectively owns the memory associated with the
// allocations.
SmallVector<Allocation, 2> AllocatedSections;
// This vector contains pointers to Allocation objects for any sections we
// have allocated locally but have not yet remapped for the remote target.
// When we receive notification of a completed module load, we will map
// these sections into the remote target.
SmallVector<Allocation, 2> UnmappedSections;
// This map tracks the sections we have remapped for the remote target
// but have not yet copied to the target.
DenseMap<uint64_t, Allocation> MappedSections;
// FIXME: This is part of a work around to keep sections near one another
// when MCJIT performs relocations after code emission but before
// the generated code is moved to the remote target.
sys::MemoryBlock Near;
sys::MemoryBlock allocateSection(uintptr_t Size);
RemoteTarget *Target;
RemoteMemoryManager() : Target(nullptr) {}
virtual ~RemoteMemoryManager();
uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID,
StringRef SectionName) override;
uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID, StringRef SectionName,
bool IsReadOnly) override;
// For now, remote symbol resolution is not support in lli. The MCJIT
// interface does support this, but clients must provide their own
// mechanism for finding remote symbol addresses. MCJIT will resolve
// symbols from Modules it contains.
uint64_t getSymbolAddress(const std::string &Name) override { return 0; }
void notifyObjectLoaded(ExecutionEngine *EE, const ObjectImage *Obj) override;
bool finalizeMemory(std::string *ErrMsg) override;
// For now, remote EH frame registration isn't supported. Remote symbol
// resolution is a prerequisite to supporting remote EH frame registration.
void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr,
size_t Size) override {}
void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr,
size_t Size) override {}
// This is a non-interface function used by lli
void setRemoteTarget(RemoteTarget *T) { Target = T; }
// The following obsolete JITMemoryManager calls are stubbed out for
// this model.
void setMemoryWritable() override;
void setMemoryExecutable() override;
void setPoisonMemory(bool poison) override;
void AllocateGOT() override;
uint8_t *getGOTBase() const override;
uint8_t *startFunctionBody(const Function *F, uintptr_t &ActualSize) override;
uint8_t *allocateStub(const GlobalValue* F, unsigned StubSize,
unsigned Alignment) override;
void endFunctionBody(const Function *F, uint8_t *FunctionStart,
uint8_t *FunctionEnd) override;
uint8_t *allocateSpace(intptr_t Size, unsigned Alignment) override;
uint8_t *allocateGlobal(uintptr_t Size, unsigned Alignment) override;
void deallocateFunctionBody(void *Body) override;
} // end namespace llvm