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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217263 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
4.3 KiB
C++
113 lines
4.3 KiB
C++
//===-- RuntimeDyld.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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// Interface for the runtime dynamic linker facilities of the MC-JIT.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_RUNTIMEDYLD_H
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#define LLVM_EXECUTIONENGINE_RUNTIMEDYLD_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ExecutionEngine/ObjectBuffer.h"
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#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
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#include "llvm/Support/Memory.h"
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namespace llvm {
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namespace object {
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class ObjectFile;
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}
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class RuntimeDyldImpl;
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class RuntimeDyldCheckerImpl;
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class ObjectImage;
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class RuntimeDyld {
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friend class RuntimeDyldCheckerImpl;
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RuntimeDyld(const RuntimeDyld &) LLVM_DELETED_FUNCTION;
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void operator=(const RuntimeDyld &) LLVM_DELETED_FUNCTION;
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// RuntimeDyldImpl is the actual class. RuntimeDyld is just the public
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// interface.
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std::unique_ptr<RuntimeDyldImpl> Dyld;
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RTDyldMemoryManager *MM;
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bool ProcessAllSections;
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RuntimeDyldCheckerImpl *Checker;
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protected:
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// Change the address associated with a section when resolving relocations.
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// Any relocations already associated with the symbol will be re-resolved.
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void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
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public:
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RuntimeDyld(RTDyldMemoryManager *);
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~RuntimeDyld();
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/// Prepare the object contained in the input buffer for execution.
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/// Ownership of the input buffer is transferred to the ObjectImage
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/// instance returned from this function if successful. In the case of load
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/// failure, the input buffer will be deleted.
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std::unique_ptr<ObjectImage>
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loadObject(std::unique_ptr<ObjectBuffer> InputBuffer);
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/// Prepare the referenced object file for execution.
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/// Ownership of the input object is transferred to the ObjectImage
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/// instance returned from this function if successful. In the case of load
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/// failure, the input object will be deleted.
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std::unique_ptr<ObjectImage>
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loadObject(std::unique_ptr<object::ObjectFile> InputObject);
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/// Get the address of our local copy of the symbol. This may or may not
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/// be the address used for relocation (clients can copy the data around
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/// and resolve relocatons based on where they put it).
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void *getSymbolAddress(StringRef Name) const;
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/// Get the address of the target copy of the symbol. This is the address
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/// used for relocation.
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uint64_t getSymbolLoadAddress(StringRef Name) const;
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/// Resolve the relocations for all symbols we currently know about.
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void resolveRelocations();
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/// Map a section to its target address space value.
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/// Map the address of a JIT section as returned from the memory manager
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/// to the address in the target process as the running code will see it.
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/// This is the address which will be used for relocation resolution.
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void mapSectionAddress(const void *LocalAddress, uint64_t TargetAddress);
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/// Register any EH frame sections that have been loaded but not previously
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/// registered with the memory manager. Note, RuntimeDyld is responsible
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/// for identifying the EH frame and calling the memory manager with the
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/// EH frame section data. However, the memory manager itself will handle
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/// the actual target-specific EH frame registration.
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void registerEHFrames();
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void deregisterEHFrames();
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bool hasError();
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StringRef getErrorString();
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/// By default, only sections that are "required for execution" are passed to
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/// the RTDyldMemoryManager, and other sections are discarded. Passing 'true'
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/// to this method will cause RuntimeDyld to pass all sections to its
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/// memory manager regardless of whether they are "required to execute" in the
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/// usual sense. This is useful for inspecting metadata sections that may not
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/// contain relocations, E.g. Debug info, stackmaps.
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///
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/// Must be called before the first object file is loaded.
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void setProcessAllSections(bool ProcessAllSections) {
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assert(!Dyld && "setProcessAllSections must be called before loadObject.");
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this->ProcessAllSections = ProcessAllSections;
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}
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};
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} // end namespace llvm
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#endif
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