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//===-- RTDyldMemoryManager.cpp - Memory manager 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 of the runtime dynamic memory manager base class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
#define LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
#include "llvm-c/ExecutionEngine.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/CBindingWrapping.h"
#include "llvm/Support/Memory.h"
namespace llvm {
class ExecutionEngine;
namespace object {
class ObjectFile;
}
// RuntimeDyld clients often want to handle the memory management of
// what gets placed where. For JIT clients, this is the subset of
// JITMemoryManager required for dynamic loading of binaries.
//
// 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&) = delete;
void operator=(const RTDyldMemoryManager&) = delete;
public:
RTDyldMemoryManager() {}
virtual ~RTDyldMemoryManager();
/// Allocate a memory block of (at least) the given size suitable for
/// executable code. The SectionID is a unique identifier assigned by the JIT
/// engine, and optionally recorded by the memory manager to access a loaded
/// section.
virtual uint8_t *allocateCodeSection(
uintptr_t Size, unsigned Alignment, unsigned SectionID,
StringRef SectionName) = 0;
/// Allocate a memory block of (at least) the given size suitable for data.
/// The SectionID is a unique identifier assigned by the JIT engine, and
/// optionally recorded by the memory manager to access a loaded section.
virtual uint8_t *allocateDataSection(
uintptr_t Size, unsigned Alignment, unsigned SectionID,
StringRef SectionName, bool IsReadOnly) = 0;
/// Inform the memory manager about the total amount of memory required to
/// allocate all sections to be loaded:
/// \p CodeSize - the total size of all code sections
/// \p DataSizeRO - the total size of all read-only data sections
/// \p DataSizeRW - the total size of all read-write data sections
///
/// Note that by default the callback is disabled. To enable it
/// redefine the method needsToReserveAllocationSpace to return true.
virtual void reserveAllocationSpace(
uintptr_t CodeSize, uintptr_t DataSizeRO, uintptr_t DataSizeRW) { }
/// Override to return true to enable the reserveAllocationSpace callback.
virtual bool needsToReserveAllocationSpace() { return false; }
/// Register the EH frames with the runtime so that c++ exceptions work.
///
/// \p Addr parameter provides the local address of the EH frame section
/// data, while \p LoadAddr provides the address of the data in the target
/// address space. If the section has not been remapped (which will usually
/// be the case for local execution) these two values will be the same.
virtual void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size);
virtual void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size);
/// This method returns the address of the specified function or variable in
/// the current process.
static uint64_t getSymbolAddressInProcess(const std::string &Name);
/// This method returns the address of the specified function or variable.
/// It is used to resolve symbols during module linking.
virtual uint64_t getSymbolAddress(const std::string &Name) {
return getSymbolAddressInProcess(Name);
}
/// This method returns the address of the specified symbol if it exists
/// within the logical dynamic library represented by this
/// RTDyldMemoryManager. Unlike getSymbolAddress, queries through this
/// interface should return addresses for hidden symbols.
///
/// This is of particular importance for the Orc JIT APIs, which support lazy
/// compilation by breaking up modules: Each of those broken out modules
/// must be able to resolve hidden symbols provided by the others. Clients
/// writing memory managers for MCJIT can usually ignore this method.
///
/// This method will be queried by RuntimeDyld when checking for previous
/// definitions of common symbols. It will *not* be queried by default when
/// resolving external symbols (this minimises the link-time overhead for
/// MCJIT clients who don't care about Orc features). If you are writing a
/// RTDyldMemoryManager for Orc and want "external" symbol resolution to
/// search the logical dylib, you should override your getSymbolAddress
/// method call this method directly.
virtual uint64_t getSymbolAddressInLogicalDylib(const std::string &Name) {
return 0;
}
/// This method returns the address of the specified function. As such it is
/// only useful for resolving library symbols, not code generated symbols.
///
/// If \p AbortOnFailure is false and no function with the given name is
/// found, this function returns a null pointer. Otherwise, it prints a
/// message to stderr and aborts.
///
/// This function is deprecated for memory managers to be used with
/// MCJIT or RuntimeDyld. Use getSymbolAddress instead.
virtual void *getPointerToNamedFunction(const std::string &Name,
bool AbortOnFailure = true);
/// This method is called after an object has been loaded into memory but
/// before relocations are applied to the loaded sections. The object load
/// may have been initiated by MCJIT to resolve an external symbol for another
/// object that is being finalized. In that case, the object about which
/// the memory manager is being notified will be finalized immediately after
/// the memory manager returns from this call.
///
/// Memory managers which are preparing code for execution in an external
/// address space can use this call to remap the section addresses for the
/// newly loaded object.
virtual void notifyObjectLoaded(ExecutionEngine *EE,
const object::ObjectFile &) {}
/// This method is called when object loading is complete and section page
/// permissions can be applied. It is up to the memory manager implementation
/// to decide whether or not to act on this method. The memory manager will
/// typically allocate all sections as read-write and then apply specific
/// permissions when this method is called. Code sections cannot be executed
/// until this function has been called. In addition, any cache coherency
/// operations needed to reliably use the memory are also performed.
///
/// Returns true if an error occurred, false otherwise.
virtual bool finalizeMemory(std::string *ErrMsg = nullptr) = 0;
};
// Create wrappers for C Binding types (see CBindingWrapping.h).
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(
RTDyldMemoryManager, LLVMMCJITMemoryManagerRef)
} // namespace llvm
#endif
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