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7486d92a6c
For COFF and MachO, sections semantically have relocations that apply to them. That is not the case on ELF. In relocatable objects (.o), a section with relocations in ELF has offsets to another section where the relocations should be applied. In dynamic objects and executables, relocations don't have an offset, they have a virtual address. The section sh_info may or may not point to another section, but that is not actually used for resolving the relocations. This patch exposes that in the ObjectFile API. It has the following advantages: * Most (all?) clients can handle this more efficiently. They will normally walk all relocations, so doing an effort to iterate in a particular order doesn't save time. * llvm-readobj now prints relocations in the same way the native readelf does. * probably most important, relocations that don't point to any section are now visible. This is the case of relocations in the rela.dyn section. See the updated relocation-executable.test for example. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182908 91177308-0d34-0410-b5e6-96231b3b80d8
77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
//===- ObjectFile.cpp - File format independent object file -----*- 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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// This file defines a file format independent ObjectFile class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/system_error.h"
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using namespace llvm;
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using namespace object;
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void ObjectFile::anchor() { }
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ObjectFile::ObjectFile(unsigned int Type, MemoryBuffer *source)
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: Binary(Type, source) {
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}
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error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
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uint32_t &Result) const {
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Result = 0;
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return object_error::success;
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}
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section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
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return section_iterator(SectionRef(Sec, this));
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}
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ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) {
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if (!Object || Object->getBufferSize() < 64)
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return 0;
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sys::LLVMFileType type = sys::IdentifyFileType(Object->getBufferStart(),
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static_cast<unsigned>(Object->getBufferSize()));
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switch (type) {
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case sys::Unknown_FileType:
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return 0;
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case sys::ELF_Relocatable_FileType:
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case sys::ELF_Executable_FileType:
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case sys::ELF_SharedObject_FileType:
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case sys::ELF_Core_FileType:
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return createELFObjectFile(Object);
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case sys::Mach_O_Object_FileType:
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case sys::Mach_O_Executable_FileType:
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case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
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case sys::Mach_O_Core_FileType:
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case sys::Mach_O_PreloadExecutable_FileType:
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case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
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case sys::Mach_O_DynamicLinker_FileType:
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case sys::Mach_O_Bundle_FileType:
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case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
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case sys::Mach_O_DSYMCompanion_FileType:
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return createMachOObjectFile(Object);
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case sys::COFF_FileType:
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return createCOFFObjectFile(Object);
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default:
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llvm_unreachable("Unexpected Object File Type");
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}
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}
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ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
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OwningPtr<MemoryBuffer> File;
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if (MemoryBuffer::getFile(ObjectPath, File))
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return NULL;
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return createObjectFile(File.take());
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}
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