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93 lines
2.3 KiB
C++
93 lines
2.3 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_symbols;
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std::atomic_int num_files;
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ObjectFile::ObjectFile(MemoryBufferRef mb) : mb(mb) {}
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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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llvm::Timer parse1_timer("parse1", "parse1", Timers);
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llvm::Timer parse2_timer("parse2", "parse2", Timers);
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void ObjectFile::parse() {
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num_files++;
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parse1_timer.startTimer();
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ELFFile<ELF64LE> obj = check(ELFFile<ELF64LE>::create(mb.getBuffer()));
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ArrayRef<ELF64LE::Shdr> sections = CHECK(obj.sections(), this);
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// Find a symbol table.
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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(sections, is_dso ? SHT_DYNSYM : SHT_SYMTAB);
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if (!symtab_sec)
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return;
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firstGlobal = symtab_sec->sh_info;
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ArrayRef<ELF64LE::Sym> elf_syms = CHECK(obj.symbols(symtab_sec), this);
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StringRef string_table =
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CHECK(obj.getStringTableForSymtab(*symtab_sec, sections), this);
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symbol_instances.reserve(elf_syms.size());
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symbols.reserve(elf_syms.size());
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parse1_timer.stopTimer();
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parse2_timer.startTimer();
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for (int i = 0; i < elf_syms.size(); i++) {
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StringRef name;
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if (firstGlobal <= i)
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name = CHECK(elf_syms[i].getName(string_table), this);
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symbol_instances.push_back({name, this});
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}
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parse2_timer.stopTimer();
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}
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void ObjectFile::register_defined_symbols() {
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for (int i = 0; i < symbol_instances.size(); i++) {
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Symbol &sym = symbol_instances[i];
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if (i < firstGlobal) {
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symbols.push_back(&sym);
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continue;
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}
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symbol_table.add(sym.name, sym);
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symbols.push_back(&sym);
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num_symbols++;
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}
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}
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StringRef ObjectFile::getFilename() {
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return mb.getBufferIdentifier();
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}
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std::string toString(ObjectFile *obj) {
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return obj->getFilename().str();
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}
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