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