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cb086f2a4f
libExecutionEngine. Move method implementations that aren't specific to allocation out of SectionMemoryManager and into RTDyldMemoryManager. This is in preparation for exposing RTDyldMemoryManager through the C API. This is a fixed version of r182407. That revision broke builds because I forgot to move the conditional includes of various POSIX headers from SectionMemoryManager into RTDyldMemoryManager. Those includes are necessary because of how getPointerToNamedFunction works around the glibc libc_nonshared.a thing. llvm-svn: 182411
77 lines
3.4 KiB
C++
77 lines
3.4 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_RT_DYLD_MEMORY_MANAGER_H
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#define LLVM_EXECUTIONENGINE_RT_DYLD_MEMORY_MANAGER_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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#include "llvm-c/ExecutionEngine.h"
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namespace llvm {
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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(uintptr_t Size, unsigned Alignment,
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unsigned SectionID) = 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(uintptr_t Size, unsigned Alignment,
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unsigned SectionID, bool IsReadOnly) = 0;
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/// Register the EH frames with the runtime so that c++ exceptions work.
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virtual void registerEHFrames(StringRef SectionData);
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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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virtual void *getPointerToNamedFunction(const std::string &Name,
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bool AbortOnFailure = true);
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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 = 0) = 0;
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};
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} // namespace llvm
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#endif // LLVM_EXECUTIONENGINE_RT_DYLD_MEMORY_MANAGER_H
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