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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_RUNTIME_DYLD_H
#define LLVM_RUNTIME_DYLD_H
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Memory.h"
namespace llvm {
class RuntimeDyldImpl;
class MemoryBuffer;
// RuntimeDyld clients often want to handle the memory management of
// what gets placed where. For JIT clients, this is an abstraction layer
// over the JITMemoryManager, which references objects by their source
// representations in LLVM IR.
// FIXME: As the RuntimeDyld fills out, additional routines will be needed
// for the varying types of objects to be allocated.
class RTDyldMemoryManager {
RTDyldMemoryManager(const RTDyldMemoryManager&); // DO NOT IMPLEMENT
void operator=(const RTDyldMemoryManager&); // DO NOT IMPLEMENT
public:
RTDyldMemoryManager() {}
virtual ~RTDyldMemoryManager();
/// allocateCodeSection - Allocate a memory block of (at least) the given
/// size suitable for executable code.
virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID) = 0;
/// allocateDataSection - Allocate a memory block of (at least) the given
/// size suitable for data.
virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID) = 0;
// Allocate ActualSize bytes, or more, for the named function. Return
// a pointer to the allocated memory and update Size to reflect how much
// memory was acutally allocated.
virtual uint8_t *startFunctionBody(const char *Name, uintptr_t &Size) = 0;
// Mark the end of the function, including how much of the allocated
// memory was actually used.
virtual void endFunctionBody(const char *Name, uint8_t *FunctionStart,
uint8_t *FunctionEnd) = 0;
virtual void *getPointerToNamedFunction(const std::string &Name,
bool AbortOnFailure = true) = 0;
};
class RuntimeDyld {
RuntimeDyld(const RuntimeDyld &); // DO NOT IMPLEMENT
void operator=(const RuntimeDyld &); // DO NOT IMPLEMENT
// 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();
bool loadObject(MemoryBuffer *InputBuffer);
// 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);
// Resolve the relocations for all symbols we currently know about.
void resolveRelocations();
/// mapSectionAddress - 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(void *LocalAddress, uint64_t TargetAddress);
StringRef getErrorString();
};
} // end namespace llvm
#endif
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