Method ApplyHeader

view/sharedcache/core/MachOProcessor.cpp:20–132

}

void SharedCacheMachOProcessor::ApplyHeader(const SharedCache& cache, SharedCacheMachOHeader& header)
{
	auto typeLibraryFromName = [&](const std::string& name) -> Ref<TypeLibrary> {
		// Check to see if we have already loaded the type library.
		if (auto typeLib = m_view->GetTypeLibrary(name))
			return typeLib;

		auto typeLibs = m_view->GetDefaultPlatform()->GetTypeLibrariesByName(name);
		if (!typeLibs.empty())
			return typeLibs.front();
		return nullptr;
	};

	// Add a section for the header itself.
	std::string headerSection = fmt::format("{}::__macho_header", header.identifierPrefix);
	uint64_t machHeaderSize = m_vm->GetAddressSize() == 8 ? sizeof(mach_header_64) : sizeof(mach_header);
	uint64_t headerSectionSize = machHeaderSize + header.ident.sizeofcmds;
	m_view->AddUserSection(headerSection, header.textBase, headerSectionSize, ReadOnlyDataSectionSemantics);

	ApplyHeaderSections(header);
	ApplyHeaderDataVariables(header);

	// Pull the available type library for the image we are loading, so we can apply known types.
	auto typeLib = typeLibraryFromName(header.installName);

	if (header.linkeditPresent && m_vm->IsAddressMapped(header.linkeditSegment.vmaddr))
	{
		if (m_applyFunctions && header.functionStartsPresent)
		{
			auto targetPlatform = m_view->GetDefaultPlatform();
			auto functions = header.ReadFunctionTable(*m_vm);
			for (const auto& func : functions)
				m_view->AddFunctionForAnalysis(targetPlatform, func, false);
		}

		m_view->BeginBulkModifySymbols();

		// Apply symbols from symbol table.
		if (header.symtab.symoff != 0)
		{
			// NOTE: This table is read relative to the link edit segment file base.
			// NOTE: This does not handle the shared .symbols cache entry symbols, that is the responsibility of the caller.
			TableInfo symbolInfo = { header.GetLinkEditFileBase() + header.symtab.symoff, header.symtab.nsyms };
			TableInfo stringInfo = { header.GetLinkEditFileBase() + header.symtab.stroff, header.symtab.strsize };
			const auto symbols = header.ReadSymbolTable(*m_vm, symbolInfo, stringInfo);
			for (const auto& sym : symbols)
			{
				auto [symbol, symbolType] = sym.GetBNSymbolAndType(*m_view);
				ApplySymbol(m_view, typeLib, symbol, symbolType);
			}
		}

		// Apply symbols from export trie.
		if (header.exportTriePresent)
		{
			// NOTE: This table is read relative to the link edit segment file base.
			const auto exportSymbols = header.ReadExportSymbolTrie(*m_vm);
			for (const auto& sym : exportSymbols)