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RuntimeDyld symbol info previously consisted of just a Section/Offset pair. This patch replaces that pair type with a SymbolInfo class that also tracks symbol visibility. A new method, RuntimeDyld::getExportedSymbolLoadAddress, is introduced which only returns a non-zero result for exported symbols. For non-exported or non-existant symbols this method will return zero. The RuntimeDyld::getSymbolAddress method retains its current behavior, returning non-zero results for all symbols regardless of visibility. No in-tree clients of RuntimeDyld are changed. The newly introduced functionality will be used by the Orc APIs. No test case: Since this patch doesn't modify the behavior for any in-tree clients we don't have a good tool to test this with yet. Once Orc is in we can use it to write regression tests that test these changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226341 91177308-0d34-0410-b5e6-96231b3b80d8
130 lines
4.6 KiB
C++
130 lines
4.6 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/RTDyldMemoryManager.h"
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#include "llvm/Support/Memory.h"
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#include <memory>
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namespace llvm {
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namespace object {
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class ObjectFile;
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template <typename T> class OwningBinary;
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}
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class RuntimeDyldImpl;
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class RuntimeDyldCheckerImpl;
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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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/// \brief Information about the loaded object.
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class LoadedObjectInfo {
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friend class RuntimeDyldImpl;
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public:
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LoadedObjectInfo(RuntimeDyldImpl &RTDyld, unsigned BeginIdx,
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unsigned EndIdx)
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: RTDyld(RTDyld), BeginIdx(BeginIdx), EndIdx(EndIdx) { }
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virtual ~LoadedObjectInfo() {}
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virtual object::OwningBinary<object::ObjectFile>
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getObjectForDebug(const object::ObjectFile &Obj) const = 0;
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uint64_t getSectionLoadAddress(StringRef Name) const;
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protected:
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virtual void anchor();
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RuntimeDyldImpl &RTDyld;
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unsigned BeginIdx, EndIdx;
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};
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RuntimeDyld(RTDyldMemoryManager *);
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~RuntimeDyld();
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/// Add the referenced object file to the list of objects to be loaded and
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/// relocated.
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std::unique_ptr<LoadedObjectInfo> loadObject(const object::ObjectFile &O);
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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 (works for both exported
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/// and non-exported symbols). This is the address used for relocation.
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uint64_t getSymbolLoadAddress(StringRef Name) const;
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/// Get the address of the target copy of the symbol (works for exported
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/// symbols only). This is the address used for relocation.
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uint64_t getExportedSymbolLoadAddress(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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