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00e08fcaa0
Add header guards to files that were missing guards. Remove #endif comments as they don't seem common in LLVM (we can easily add them back if we decide they're useful) Changes made by clang-tidy with minor tweaks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215558 91177308-0d34-0410-b5e6-96231b3b80d8
127 lines
5.7 KiB
C++
127 lines
5.7 KiB
C++
//===-- RTDyldMemoryManager.cpp - Memory manager 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 of the runtime dynamic memory manager base class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
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#define LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
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#include "llvm-c/ExecutionEngine.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/CBindingWrapping.h"
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#include "llvm/Support/Memory.h"
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namespace llvm {
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class ExecutionEngine;
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class ObjectImage;
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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 the subset of
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// JITMemoryManager required for dynamic loading of binaries.
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//
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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&) LLVM_DELETED_FUNCTION;
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void operator=(const RTDyldMemoryManager&) LLVM_DELETED_FUNCTION;
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public:
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RTDyldMemoryManager() {}
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virtual ~RTDyldMemoryManager();
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/// Allocate a memory block of (at least) the given size suitable for
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/// executable code. The SectionID is a unique identifier assigned by the JIT
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/// engine, and optionally recorded by the memory manager to access a loaded
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/// section.
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virtual uint8_t *allocateCodeSection(
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uintptr_t Size, unsigned Alignment, unsigned SectionID,
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StringRef SectionName) = 0;
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/// Allocate a memory block of (at least) the given size suitable for data.
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/// The SectionID is a unique identifier assigned by the JIT engine, and
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/// optionally recorded by the memory manager to access a loaded section.
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virtual uint8_t *allocateDataSection(
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uintptr_t Size, unsigned Alignment, unsigned SectionID,
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StringRef SectionName, bool IsReadOnly) = 0;
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/// Inform the memory manager about the total amount of memory required to
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/// allocate all sections to be loaded:
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/// \p CodeSize - the total size of all code sections
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/// \p DataSizeRO - the total size of all read-only data sections
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/// \p DataSizeRW - the total size of all read-write data sections
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///
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/// Note that by default the callback is disabled. To enable it
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/// redefine the method needsToReserveAllocationSpace to return true.
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virtual void reserveAllocationSpace(
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uintptr_t CodeSize, uintptr_t DataSizeRO, uintptr_t DataSizeRW) { }
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/// Override to return true to enable the reserveAllocationSpace callback.
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virtual bool needsToReserveAllocationSpace() { return false; }
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/// Register the EH frames with the runtime so that c++ exceptions work.
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///
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/// \p Addr parameter provides the local address of the EH frame section
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/// data, while \p LoadAddr provides the address of the data in the target
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/// address space. If the section has not been remapped (which will usually
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/// be the case for local execution) these two values will be the same.
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virtual void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size);
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virtual void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size);
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/// This method returns the address of the specified function or variable.
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/// It is used to resolve symbols during module linking.
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virtual uint64_t getSymbolAddress(const std::string &Name);
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/// This method returns the address of the specified function. As such it is
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/// only useful for resolving library symbols, not code generated symbols.
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///
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/// If \p AbortOnFailure is false and no function with the given name is
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/// found, this function returns a null pointer. Otherwise, it prints a
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/// message to stderr and aborts.
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///
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/// This function is deprecated for memory managers to be used with
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/// MCJIT or RuntimeDyld. Use getSymbolAddress instead.
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virtual void *getPointerToNamedFunction(const std::string &Name,
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bool AbortOnFailure = true);
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/// This method is called after an object has been loaded into memory but
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/// before relocations are applied to the loaded sections. The object load
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/// may have been initiated by MCJIT to resolve an external symbol for another
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/// object that is being finalized. In that case, the object about which
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/// the memory manager is being notified will be finalized immediately after
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/// the memory manager returns from this call.
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///
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/// Memory managers which are preparing code for execution in an external
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/// address space can use this call to remap the section addresses for the
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/// newly loaded object.
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virtual void notifyObjectLoaded(ExecutionEngine *EE,
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const ObjectImage *) {}
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/// This method is called when object loading is complete and section page
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/// permissions can be applied. It is up to the memory manager implementation
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/// to decide whether or not to act on this method. The memory manager will
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/// typically allocate all sections as read-write and then apply specific
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/// permissions when this method is called. Code sections cannot be executed
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/// until this function has been called. In addition, any cache coherency
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/// operations needed to reliably use the memory are also performed.
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///
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/// Returns true if an error occurred, false otherwise.
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virtual bool finalizeMemory(std::string *ErrMsg = nullptr) = 0;
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};
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// Create wrappers for C Binding types (see CBindingWrapping.h).
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DEFINE_SIMPLE_CONVERSION_FUNCTIONS(
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RTDyldMemoryManager, LLVMMCJITMemoryManagerRef)
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} // namespace llvm
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#endif
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