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//===-- RuntimeDyldImpl.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 implementations of runtime dynamic linker facilities.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_RUNTIME_DYLD_IMPL_H
#define LLVM_RUNTIME_DYLD_IMPL_H
#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Twine.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/Support/Memory.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/system_error.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
namespace llvm {
class RuntimeDyldImpl {
protected:
unsigned CPUType;
unsigned CPUSubtype;
// The MemoryManager to load objects into.
RTDyldMemoryManager *MemMgr;
// For each section, we have a MemoryBlock of it's data.
// Indexed by SectionID.
SmallVector<sys::MemoryBlock, 32> Sections;
// For each section, the address it will be considered to live at for
// relocations. The same as the pointer to the above memory block for hosted
// JITs. Indexed by SectionID.
SmallVector<uint64_t, 32> SectionLoadAddress;
// Keep a map of starting local address to the SectionID which references it.
// Lookup function for when we assign virtual addresses.
DenseMap<void *, unsigned> SectionLocalMemToID;
// Master symbol table. As modules are loaded and external symbols are
// resolved, their addresses are stored here as a SectionID/Offset pair.
typedef std::pair<unsigned, uint64_t> SymbolLoc;
StringMap<SymbolLoc> SymbolTable;
bool HasError;
std::string ErrorStr;
// Set the error state and record an error string.
bool Error(const Twine &Msg) {
ErrorStr = Msg.str();
HasError = true;
return true;
}
uint8_t *getSectionAddress(unsigned SectionID) {
return (uint8_t*)Sections[SectionID].base();
}
void extractFunction(StringRef Name, uint8_t *StartAddress,
uint8_t *EndAddress);
public:
RuntimeDyldImpl(RTDyldMemoryManager *mm) : MemMgr(mm), HasError(false) {}
virtual ~RuntimeDyldImpl();
virtual bool loadObject(MemoryBuffer *InputBuffer) = 0;
void *getSymbolAddress(StringRef Name) {
// FIXME: Just look up as a function for now. Overly simple of course.
// Work in progress.
if (SymbolTable.find(Name) == SymbolTable.end())
return 0;
SymbolLoc Loc = SymbolTable.lookup(Name);
return getSectionAddress(Loc.first) + Loc.second;
}
virtual void resolveRelocations();
virtual void reassignSectionAddress(unsigned SectionID, uint64_t Addr) = 0;
void mapSectionAddress(void *LocalAddress, uint64_t TargetAddress);
// Is the linker in an error state?
bool hasError() { return HasError; }
// Mark the error condition as handled and continue.
void clearError() { HasError = false; }
// Get the error message.
StringRef getErrorString() { return ErrorStr; }
virtual bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const = 0;
};
} // end namespace llvm
#endif
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