Function encodeInstructionStartingWithImmediate

source/text.cpp:493–527

Encodes an instruction started by ! at the given position in text. Puts the encoded words into *pInst. If successful, moves position past the instruction and returns SPV_SUCCESS. Otherwise, returns an error code and leaves position pointing to the error in text.

/// instruction and returns SPV_SUCCESS.  Otherwise, returns an error code and
/// leaves position pointing to the error in text.
spv_result_t encodeInstructionStartingWithImmediate(
    const spvtools::AssemblyGrammar& grammar,
    spvtools::AssemblyContext* context, spv_instruction_t* pInst) {
  std::string firstWord;
  spv_position_t nextPosition = {};
  auto error = context->getWord(&firstWord, &nextPosition);
  if (error) return context->diagnostic(error) << "Internal Error";

  if ((error = encodeImmediate(context, firstWord.c_str(), pInst))) {
    return error;
  }
  while (context->advance() != SPV_END_OF_STREAM) {
    // A beginning of a new instruction means we're done.
    if (context->isStartOfNewInst()) return SPV_SUCCESS;

    // Otherwise, there must be an operand that's either a literal, an ID, or
    // an immediate.
    std::string operandValue;
    if ((error = context->getWord(&operandValue, &nextPosition)))
      return context->diagnostic(error) << "Internal Error";

    if (operandValue == "=")
      return context->diagnostic() << firstWord << " not allowed before =.";

    // Needed to pass to spvTextEncodeOperand(), but it shouldn't ever be
    // expanded.
    spv_operand_pattern_t dummyExpectedOperands;
    error = spvTextEncodeOperand(
        grammar, context, SPV_OPERAND_TYPE_OPTIONAL_CIV, operandValue.c_str(),
        pInst, &dummyExpectedOperands);
    if (error) return error;
    context->setPosition(nextPosition);
  }
  return SPV_SUCCESS;
}

/// @brief Translate an instruction started by OpUnknown and the following
/// operands to binary form