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1. The main works will made in the RuntimeDyLdImpl with uses the ObjectFile class. RuntimeDyLdMachO and RuntimeDyLdELF now only parses relocations and resolve it. This is allows to make improvements of the RuntimeDyLd more easily. In addition the support for COFF can be easily added. 2. Added ARM relocations to RuntimeDyLdELF. 3. Added support for stub functions for the ARM, allowing to do a long branch. 4. Added support for external functions that are not loaded from the object files, but can be loaded from external libraries. Now MCJIT can correctly execute the code containing the printf, putc, and etc. 5. The sections emitted instead functions, thanks Jim Grosbach. MemoryManager.startFunctionBody() and MemoryManager.endFunctionBody() have been removed. 6. MCJITMemoryManager.allocateDataSection() and MCJITMemoryManager. allocateCodeSection() used JMM->allocateSpace() instead of JMM->allocateCodeSection() and JMM->allocateDataSection(), because I got an error: "Cannot allocate an allocated block!" with object file contains more than one code or data sections. llvm-svn: 153754
88 lines
3.3 KiB
C++
88 lines
3.3 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_RUNTIME_DYLD_H
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#define LLVM_RUNTIME_DYLD_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Memory.h"
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namespace llvm {
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class RuntimeDyldImpl;
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class MemoryBuffer;
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// RuntimeDyld clients often want to handle the memory management of
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// what gets placed where. For JIT clients, this is an abstraction layer
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// over the JITMemoryManager, which references objects by their source
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// representations in LLVM IR.
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// FIXME: As the RuntimeDyld fills out, additional routines will be needed
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// for the varying types of objects to be allocated.
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class RTDyldMemoryManager {
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RTDyldMemoryManager(const RTDyldMemoryManager&); // DO NOT IMPLEMENT
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void operator=(const RTDyldMemoryManager&); // DO NOT IMPLEMENT
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public:
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RTDyldMemoryManager() {}
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virtual ~RTDyldMemoryManager();
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/// allocateCodeSection - Allocate a memory block of (at least) the given
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/// size suitable for executable code.
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virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
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unsigned SectionID) = 0;
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/// allocateDataSection - Allocate a memory block of (at least) the given
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/// size suitable for data.
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virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
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unsigned SectionID) = 0;
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virtual void *getPointerToNamedFunction(const std::string &Name,
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bool AbortOnFailure = true) = 0;
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};
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class RuntimeDyld {
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RuntimeDyld(const RuntimeDyld &); // DO NOT IMPLEMENT
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void operator=(const RuntimeDyld &); // DO NOT IMPLEMENT
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// RuntimeDyldImpl is the actual class. RuntimeDyld is just the public
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// interface.
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RuntimeDyldImpl *Dyld;
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RTDyldMemoryManager *MM;
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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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bool loadObject(MemoryBuffer *InputBuffer);
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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);
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// Resolve the relocations for all symbols we currently know about.
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void resolveRelocations();
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/// mapSectionAddress - 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(void *LocalAddress, uint64_t TargetAddress);
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StringRef getErrorString();
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};
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} // end namespace llvm
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#endif
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