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04b897752e
This is recommit for D90903 with fixes for BB: 1) Used std::move<> when returning Expected<> (http://lab.llvm.org:8011/#/builders/112/builds/913) 2) Fixed the name of temporarily file in the file-headers.test (http://lab.llvm.org:8011/#/builders/36/builds/1269) (a local old temporarily file was used before) For creating `ELFObjectFile` instances we have the factory method `ELFObjectFile<ELFT>::create(MemoryBufferRef Object)`. The problem of this method is that it scans the section header to locate some sections. When a file is truncated or has broken fields in the ELF header, this approach does not allow us to create the `ELFObjectFile` and dump the ELF header. This is https://bugs.llvm.org/show_bug.cgi?id=40804 This patch suggests a solution - it allows to delay scaning sections in the `ELFObjectFile<ELFT>::create`. It now allows user code to call an object initialization (`initContent()`) later. With that it is possible, for example, for dumpers just to dump the file header and exit. By default initialization is still performed as before, what helps to keep the logic of existent callers untouched. I've experimented with different approaches when worked on this patch. I think this approach is better than doing initialization of sections (i.e. scan of them) on demand, because normally users of `ELFObjectFile` API expect to work with a valid object. In most cases when a section header table can't be read (because of an error), we don't have to continue to work with object. So we probably don't need to implement a more complex API. Differential revision: https://reviews.llvm.org/D90903
128 lines
4.4 KiB
C++
128 lines
4.4 KiB
C++
//===- SymbolicFile.cpp - Interface that only provides symbols ------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a file format independent SymbolicFile class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/SymbolicFile.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/BinaryFormat/Magic.h"
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#include "llvm/Object/COFFImportFile.h"
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#include "llvm/Object/Error.h"
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#include "llvm/Object/IRObjectFile.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <algorithm>
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#include <memory>
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using namespace llvm;
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using namespace object;
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SymbolicFile::SymbolicFile(unsigned int Type, MemoryBufferRef Source)
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: Binary(Type, Source) {}
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SymbolicFile::~SymbolicFile() = default;
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Expected<std::unique_ptr<SymbolicFile>>
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SymbolicFile::createSymbolicFile(MemoryBufferRef Object, file_magic Type,
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LLVMContext *Context, bool InitContent) {
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StringRef Data = Object.getBuffer();
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if (Type == file_magic::unknown)
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Type = identify_magic(Data);
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if (!isSymbolicFile(Type, Context))
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return errorCodeToError(object_error::invalid_file_type);
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switch (Type) {
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case file_magic::bitcode:
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// Context is guaranteed to be non-null here, because bitcode magic only
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// indicates a symbolic file when Context is non-null.
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return IRObjectFile::create(Object, *Context);
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case file_magic::elf:
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case file_magic::elf_executable:
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case file_magic::elf_shared_object:
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case file_magic::elf_core:
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case file_magic::macho_executable:
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case file_magic::macho_fixed_virtual_memory_shared_lib:
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case file_magic::macho_core:
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case file_magic::macho_preload_executable:
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case file_magic::macho_dynamically_linked_shared_lib:
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case file_magic::macho_dynamic_linker:
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case file_magic::macho_bundle:
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case file_magic::macho_dynamically_linked_shared_lib_stub:
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case file_magic::macho_dsym_companion:
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case file_magic::macho_kext_bundle:
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case file_magic::pecoff_executable:
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case file_magic::xcoff_object_32:
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case file_magic::xcoff_object_64:
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case file_magic::wasm_object:
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return ObjectFile::createObjectFile(Object, Type, InitContent);
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case file_magic::coff_import_library:
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return std::unique_ptr<SymbolicFile>(new COFFImportFile(Object));
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case file_magic::elf_relocatable:
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case file_magic::macho_object:
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case file_magic::coff_object: {
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Expected<std::unique_ptr<ObjectFile>> Obj =
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ObjectFile::createObjectFile(Object, Type, InitContent);
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if (!Obj || !Context)
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return std::move(Obj);
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Expected<MemoryBufferRef> BCData =
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IRObjectFile::findBitcodeInObject(*Obj->get());
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if (!BCData) {
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consumeError(BCData.takeError());
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return std::move(Obj);
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}
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return IRObjectFile::create(
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MemoryBufferRef(BCData->getBuffer(), Object.getBufferIdentifier()),
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*Context);
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}
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default:
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llvm_unreachable("Unexpected Binary File Type");
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}
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}
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bool SymbolicFile::isSymbolicFile(file_magic Type, const LLVMContext *Context) {
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switch (Type) {
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case file_magic::bitcode:
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return Context != nullptr;
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case file_magic::elf:
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case file_magic::elf_executable:
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case file_magic::elf_shared_object:
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case file_magic::elf_core:
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case file_magic::macho_executable:
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case file_magic::macho_fixed_virtual_memory_shared_lib:
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case file_magic::macho_core:
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case file_magic::macho_preload_executable:
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case file_magic::macho_dynamically_linked_shared_lib:
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case file_magic::macho_dynamic_linker:
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case file_magic::macho_bundle:
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case file_magic::macho_dynamically_linked_shared_lib_stub:
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case file_magic::macho_dsym_companion:
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case file_magic::macho_kext_bundle:
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case file_magic::pecoff_executable:
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case file_magic::xcoff_object_32:
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case file_magic::xcoff_object_64:
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case file_magic::wasm_object:
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case file_magic::coff_import_library:
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case file_magic::elf_relocatable:
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case file_magic::macho_object:
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case file_magic::coff_object:
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return true;
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default:
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return false;
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}
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}
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