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3d218156f8
The constructors of classes deriving from Binary normally take an error_code as an argument to the constructor. My original intent was to change them to have a trivial constructor and move the initial parsing logic to a static method returning an ErrorOr. I changed my mind because: * A constructor with an error_code out parameter is extremely convenient from the implementation side. We can incrementally construct the object and give up when we find an error. * It is very efficient when constructing on the stack or when there is no error. The only inefficient case is where heap allocating and an error is found (we have to free the memory). The result is that this is a much smaller patch. It just standardizes the create* helpers to return an ErrorOr. Almost no functionality change: The only difference is that this found that we were trying to read past the end of COFF import library but ignoring the error. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199770 91177308-0d34-0410-b5e6-96231b3b80d8
85 lines
2.8 KiB
C++
85 lines
2.8 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/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.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->getBufferSize() < 64) {
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delete Object;
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return 0;
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}
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sys::fs::file_magic Type = sys::fs::identify_magic(Object->getBuffer());
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switch (Type) {
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case sys::fs::file_magic::unknown:
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case sys::fs::file_magic::bitcode:
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case sys::fs::file_magic::archive:
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case sys::fs::file_magic::macho_universal_binary:
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case sys::fs::file_magic::windows_resource:
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delete Object;
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return 0;
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case sys::fs::file_magic::elf_relocatable:
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case sys::fs::file_magic::elf_executable:
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case sys::fs::file_magic::elf_shared_object:
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case sys::fs::file_magic::elf_core:
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return createELFObjectFile(Object).get();
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case sys::fs::file_magic::macho_object:
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case sys::fs::file_magic::macho_executable:
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case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
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case sys::fs::file_magic::macho_core:
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case sys::fs::file_magic::macho_preload_executable:
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case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
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case sys::fs::file_magic::macho_dynamic_linker:
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case sys::fs::file_magic::macho_bundle:
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case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
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case sys::fs::file_magic::macho_dsym_companion:
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return createMachOObjectFile(Object).get();
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case sys::fs::file_magic::coff_object:
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case sys::fs::file_magic::coff_import_library:
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case sys::fs::file_magic::pecoff_executable:
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return createCOFFObjectFile(Object).get();
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}
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llvm_unreachable("Unexpected Object File Type");
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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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