mirror of
https://github.com/rui314/mold.git
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135 lines
3.3 KiB
C++
135 lines
3.3 KiB
C++
#include "chibild.h"
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using namespace llvm;
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using namespace llvm::ELF;
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std::atomic_int num_defined;
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std::atomic_int num_undefined;
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std::atomic_int num_files;
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ObjectFile::ObjectFile(MemoryBufferRef mb, StringRef archive_name)
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: mb(mb), archive_name(archive_name),
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obj(check(ELFFile<ELF64LE>::create(mb.getBuffer()))) {}
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MemoryBufferRef readFile(StringRef path) {
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auto mbOrErr = MemoryBuffer::getFile(path, -1, false);
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if (auto ec = mbOrErr.getError())
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error("cannot open " + path + ": " + ec.message());
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std::unique_ptr<MemoryBuffer> &mb = *mbOrErr;
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MemoryBufferRef mbref = mb->getMemBufferRef();
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mb.release();
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return mbref;
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}
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static const ELF64LE::Shdr
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*findSection(ArrayRef<ELF64LE::Shdr> sections, uint32_t type) {
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for (const ELF64LE::Shdr &sec : sections)
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if (sec.sh_type == type)
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return &sec;
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return nullptr;
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}
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void ObjectFile::initialize_sections() {
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elf_sections = CHECK(obj.sections(), this);
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StringRef section_strtab = CHECK(obj.getSectionStringTable(elf_sections), this);
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this->sections.reserve(sections.size());
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for (const ELF64LE::Shdr &shdr : elf_sections) {
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StringRef name = CHECK(obj.getSectionName(shdr, section_strtab), this);
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this->sections.push_back(new InputSection(this, &shdr, name));
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}
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}
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void ObjectFile::initialize_symbols() {
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bool is_dso = (identify_magic(mb.getBuffer()) == file_magic::elf_shared_object);
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const ELF64LE::Shdr *symtab_sec
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= findSection(elf_sections, is_dso ? SHT_DYNSYM : SHT_SYMTAB);
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if (!symtab_sec)
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return;
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this->first_global = symtab_sec->sh_info;
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// Parse symbols
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this->elf_syms = CHECK(obj.symbols(symtab_sec), this);
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StringRef string_table =
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CHECK(obj.getStringTableForSymtab(*symtab_sec, elf_sections), this);
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this->symbols.resize(elf_syms.size());
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for (int i = 0; i < elf_syms.size(); i++) {
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if (i < first_global)
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continue;
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StringRef name = CHECK(this->elf_syms[i].getName(string_table), this);
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symbols[i] = Symbol::intern(name);
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}
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}
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void ObjectFile::parse() {
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num_files++;
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initialize_sections();
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initialize_symbols();
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}
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class Spinlock {
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public:
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Spinlock(std::atomic_flag &lock) : lock(lock) {
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while (lock.test_and_set(std::memory_order_acquire));
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}
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~Spinlock() {
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lock.clear(std::memory_order_release);
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}
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private:
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std::atomic_flag &lock;
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};
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void ObjectFile::register_defined_symbols() {
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for (int i = first_global; i < symbols.size(); i++) {
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if (!elf_syms[i].isDefined())
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continue;
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num_defined++;
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Symbol *sym = symbols[i];
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Spinlock lock(sym->lock);
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if (sym->file && sym->file->priority < this->priority)
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continue;
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sym->file = this;
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}
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}
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void ObjectFile::register_undefined_symbols() {
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if (is_alive.exchange(true))
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return;
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for (int i = first_global; i < symbols.size(); i++) {
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if (elf_syms[i].isDefined())
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continue;
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num_undefined++;
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Symbol *sym = symbols[i];
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if (sym->file && sym->file->is_in_archive() && !sym->file->is_alive)
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sym->file->register_undefined_symbols();
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}
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}
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StringRef ObjectFile::get_filename() {
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return mb.getBufferIdentifier();
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}
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bool ObjectFile::is_in_archive() {
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return !archive_name.empty();
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}
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std::string toString(ObjectFile *obj) {
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StringRef s = obj->get_filename();
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if (obj->archive_name == "")
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return s.str();
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return (obj->archive_name + ":" + s).str();
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}
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