bool BytecodeUtil::getFunctionNameIndex()

in plugins/experimental/wasm/lib/src/bytecode_util.cc [140:195]

• 52 lines of code
• 15 McCabe index (conditional complexity)

bool BytecodeUtil::getFunctionNameIndex(std::string_view bytecode,
                                        std::unordered_map<uint32_t, std::string> &ret) {
  std::string_view name_section = {};
  if (!BytecodeUtil::getCustomSection(bytecode, "name", name_section)) {
    return false;
  };
  if (!name_section.empty()) {
    const char *pos = name_section.data();
    const char *end = name_section.data() + name_section.size();
    while (pos < end) {
      const auto subsection_id = *pos++;
      uint32_t subsection_size = 0;
      if (!parseVarint(pos, end, subsection_size) || pos + subsection_size > end) {
        return false;
      }

      if (subsection_id != 1) {
        // Skip other subsctions.
        pos += subsection_size;
      } else {
        // Enters function name subsection.
        const auto *const start = pos;
        uint32_t namemap_vector_size = 0;
        if (!parseVarint(pos, end, namemap_vector_size) || pos + namemap_vector_size > end) {
          return false;
        }
        for (uint32_t i = 0; i < namemap_vector_size; i++) {
          uint32_t func_index = 0;
          if (!parseVarint(pos, end, func_index)) {
            return false;
          }

          uint32_t func_name_size = 0;
          if (!parseVarint(pos, end, func_name_size) || pos + func_name_size > end) {
            return false;
          }
          auto func_name = std::string(pos, func_name_size);
#if !defined(_MSC_VER)
          int status;
          char *data = abi::__cxa_demangle(func_name.c_str(), nullptr, nullptr, &status);
          if (data != nullptr) {
            func_name = std::string(data);
            ::free(data);
          }
#endif
          ret.insert({func_index, func_name});
          pos += func_name_size;
        }
        if (start + subsection_size != pos) {
          return false;
        }
      }
    }
  }
  return true;
}