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da62155c11
MCJIT.
This patch decouples the two responsibilities of the RTDyldMemoryManager class,
memory management and symbol resolution, into two new classes:
RuntimeDyld::MemoryManager and RuntimeDyld::SymbolResolver.
The symbol resolution interface is modified slightly, from:
uint64_t getSymbolAddress(const std::string &Name);
to:
RuntimeDyld::SymbolInfo findSymbol(const std::string &Name);
The latter passes symbol flags along with symbol addresses, allowing RuntimeDyld
and others to reason about non-strong/non-exported symbols.
The memory management interface removes the following method:
void notifyObjectLoaded(ExecutionEngine *EE,
const object::ObjectFile &) {}
as it is not related to memory management. (Note: Backwards compatibility *is*
maintained for this method in MCJIT and OrcMCJITReplacement, see below).
The RTDyldMemoryManager class remains in-tree for backwards compatibility.
It inherits directly from RuntimeDyld::SymbolResolver, and indirectly from
RuntimeDyld::MemoryManager via the new MCJITMemoryManager class, which
just subclasses RuntimeDyld::MemoryManager and reintroduces the
notifyObjectLoaded method for backwards compatibility).
The EngineBuilder class retains the existing method:
EngineBuilder&
setMCJITMemoryManager(std::unique_ptr<RTDyldMemoryManager> mcjmm);
and includes two new methods:
EngineBuilder&
setMemoryManager(std::unique_ptr<MCJITMemoryManager> MM);
EngineBuilder&
setSymbolResolver(std::unique_ptr<RuntimeDyld::SymbolResolver> SR);
Clients should use EITHER:
A single call to setMCJITMemoryManager with an RTDyldMemoryManager.
OR (exclusive)
One call each to each of setMemoryManager and setSymbolResolver.
This patch should be fully compatible with existing uses of RTDyldMemoryManager.
If it is not it should be considered a bug, and the patch either fixed or
reverted.
If clients find the new API to be an improvement the goal will be to deprecate
and eventually remove the RTDyldMemoryManager class in favor of the new classes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233509 91177308-0d34-0410-b5e6-96231b3b80d8
124 lines
4.7 KiB
C++
124 lines
4.7 KiB
C++
//===-- RuntimeDyldELF.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-===//
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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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// ELF support for MC-JIT runtime dynamic linker.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
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#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
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#include "RuntimeDyldImpl.h"
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#include "llvm/ADT/DenseMap.h"
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using namespace llvm;
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namespace llvm {
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class RuntimeDyldELF : public RuntimeDyldImpl {
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void resolveRelocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend,
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uint64_t SymOffset = 0);
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void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend,
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uint64_t SymOffset);
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void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset,
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uint32_t Value, uint32_t Type, int32_t Addend);
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void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend);
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void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset,
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uint32_t Value, uint32_t Type, int32_t Addend);
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void resolveMIPSRelocation(const SectionEntry &Section, uint64_t Offset,
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uint32_t Value, uint32_t Type, int32_t Addend);
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void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend);
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void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset,
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uint64_t Value, uint32_t Type, int64_t Addend);
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unsigned getMaxStubSize() override {
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if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be)
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return 20; // movz; movk; movk; movk; br
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if (Arch == Triple::arm || Arch == Triple::thumb)
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return 8; // 32-bit instruction and 32-bit address
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else if (Arch == Triple::mipsel || Arch == Triple::mips)
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return 16;
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else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le)
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return 44;
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else if (Arch == Triple::x86_64)
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return 6; // 2-byte jmp instruction + 32-bit relative address
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else if (Arch == Triple::systemz)
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return 16;
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else
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return 0;
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}
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unsigned getStubAlignment() override {
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if (Arch == Triple::systemz)
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return 8;
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else
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return 1;
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}
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void findPPC64TOCSection(const ObjectFile &Obj,
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ObjSectionToIDMap &LocalSections,
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RelocationValueRef &Rel);
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void findOPDEntrySection(const ObjectFile &Obj,
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ObjSectionToIDMap &LocalSections,
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RelocationValueRef &Rel);
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uint64_t findGOTEntry(uint64_t LoadAddr, uint64_t Offset);
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size_t getGOTEntrySize();
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void updateGOTEntries(StringRef Name, uint64_t Addr) override;
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// Relocation entries for symbols whose position-independent offset is
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// updated in a global offset table.
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typedef SmallVector<RelocationValueRef, 2> GOTRelocations;
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GOTRelocations GOTEntries; // List of entries requiring finalization.
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SmallVector<std::pair<SID, GOTRelocations>, 8> GOTs; // Allocated tables.
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// When a module is loaded we save the SectionID of the EH frame section
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// in a table until we receive a request to register all unregistered
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// EH frame sections with the memory manager.
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SmallVector<SID, 2> UnregisteredEHFrameSections;
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SmallVector<SID, 2> RegisteredEHFrameSections;
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public:
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RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr,
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RuntimeDyld::SymbolResolver &Resolver);
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virtual ~RuntimeDyldELF();
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std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
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loadObject(const object::ObjectFile &O) override;
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void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override;
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relocation_iterator
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processRelocationRef(unsigned SectionID, relocation_iterator RelI,
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const ObjectFile &Obj,
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ObjSectionToIDMap &ObjSectionToID,
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StubMap &Stubs) override;
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bool isCompatibleFile(const object::ObjectFile &Obj) const override;
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void registerEHFrames() override;
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void deregisterEHFrames() override;
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void finalizeLoad(const ObjectFile &Obj,
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ObjSectionToIDMap &SectionMap) override;
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};
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} // end namespace llvm
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#endif
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