llvm-6502/include/llvm/ExecutionEngine/RuntimeDyld.h
Lang Hames 42fdb1f00f Re-apply r196639: Add support for archives and object file caching under MCJIT.
I believe the bot failures on linux systems were due to overestimating the
alignment of object-files within archives, which are only guaranteed to be
two-byte aligned. I have reduced the alignment in
RuntimeDyldELF::createObjectImageFromFile accordingly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198737 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-08 04:09:09 +00:00

92 lines
3.3 KiB
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//===-- RuntimeDyld.h - Run-time dynamic linker for MC-JIT ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Interface for the runtime dynamic linker facilities of the MC-JIT.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_RUNTIMEDYLD_H
#define LLVM_EXECUTIONENGINE_RUNTIMEDYLD_H
#include "llvm/ADT/StringRef.h"
#include "llvm/ExecutionEngine/ObjectBuffer.h"
#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
#include "llvm/Support/Memory.h"
namespace llvm {
namespace object {
class ObjectFile;
}
class RuntimeDyldImpl;
class ObjectImage;
class RuntimeDyld {
RuntimeDyld(const RuntimeDyld &) LLVM_DELETED_FUNCTION;
void operator=(const RuntimeDyld &) LLVM_DELETED_FUNCTION;
// RuntimeDyldImpl is the actual class. RuntimeDyld is just the public
// interface.
RuntimeDyldImpl *Dyld;
RTDyldMemoryManager *MM;
protected:
// Change the address associated with a section when resolving relocations.
// Any relocations already associated with the symbol will be re-resolved.
void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
public:
RuntimeDyld(RTDyldMemoryManager *);
~RuntimeDyld();
/// Prepare the object contained in the input buffer for execution.
/// Ownership of the input buffer is transferred to the ObjectImage
/// instance returned from this function if successful. In the case of load
/// failure, the input buffer will be deleted.
ObjectImage *loadObject(ObjectBuffer *InputBuffer);
/// Prepare the referenced object file for execution.
/// Ownership of the input object is transferred to the ObjectImage
/// instance returned from this function if successful. In the case of load
/// failure, the input object will be deleted.
ObjectImage *loadObject(object::ObjectFile *InputObject);
/// Get the address of our local copy of the symbol. This may or may not
/// be the address used for relocation (clients can copy the data around
/// and resolve relocatons based on where they put it).
void *getSymbolAddress(StringRef Name);
/// Get the address of the target copy of the symbol. This is the address
/// used for relocation.
uint64_t getSymbolLoadAddress(StringRef Name);
/// Resolve the relocations for all symbols we currently know about.
void resolveRelocations();
/// Map a section to its target address space value.
/// Map the address of a JIT section as returned from the memory manager
/// to the address in the target process as the running code will see it.
/// This is the address which will be used for relocation resolution.
void mapSectionAddress(const void *LocalAddress, uint64_t TargetAddress);
/// Register any EH frame sections that have been loaded but not previously
/// registered with the memory manager. Note, RuntimeDyld is responsible
/// for identifying the EH frame and calling the memory manager with the
/// EH frame section data. However, the memory manager itself will handle
/// the actual target-specific EH frame registration.
void registerEHFrames();
void deregisterEHFrames();
StringRef getErrorString();
};
} // end namespace llvm
#endif