Method parseModule

source/binary.cpp:268–308

}

spv_result_t Parser::parseModule() {
  if (!_.words) return diagnostic() << "Missing module.";

  if (_.num_words < SPV_INDEX_INSTRUCTION)
    return diagnostic() << "Module has incomplete header: only " << _.num_words
                        << " words instead of " << SPV_INDEX_INSTRUCTION;

  // Check the magic number and detect the module's endianness.
  spv_const_binary_t binary{_.words, _.num_words};
  if (spvBinaryEndianness(&binary, &_.endian)) {
    return diagnostic() << "Invalid SPIR-V magic number '" << std::hex
                        << _.words[0] << "'.";
  }
  _.requires_endian_conversion = !spvIsHostEndian(_.endian);

  // Process the header.
  spv_header_t header;
  if (spvBinaryHeaderGet(&binary, _.endian, &header)) {
    // It turns out there is no way to trigger this error since the only
    // failure cases are already handled above, with better messages.
    return diagnostic(SPV_ERROR_INTERNAL)
           << "Internal error: unhandled header parse failure";
  }
  if (parsed_header_fn_) {
    if (auto error = parsed_header_fn_(user_data_, _.endian, header.magic,
                                       header.version, header.generator,
                                       header.bound, header.schema)) {
      return error;
    }
  }

  // Process the instructions.
  _.word_index = SPV_INDEX_INSTRUCTION;
  while (_.word_index < _.num_words)
    if (auto error = parseInstruction()) return error;

  // Running off the end should already have been reported earlier.
  assert(_.word_index == _.num_words);

  return SPV_SUCCESS;
}

spv_result_t Parser::parseInstruction() {
  _.instruction_count++;