Method GetCodegendComputeFnImpl

be/src/exprs/literal.cc:389–462

IR produced for bigint literal 10: define { i8, i64 } @Literal(i8* %context, %"class.impala::TupleRow"* %row) { entry: ret { i8, i64 } { i8 0, i64 10 } }

//   ret { i8, i64 } { i8 0, i64 10 }
// }
Status Literal::GetCodegendComputeFnImpl(LlvmCodeGen* codegen, llvm::Function** fn) {
  DCHECK_EQ(GetNumChildren(), 0);
  llvm::Value* args[2];
  *fn = CreateIrFunctionPrototype("Literal", codegen, &args);
  llvm::BasicBlock* entry_block =
      llvm::BasicBlock::Create(codegen->context(), "entry", *fn);
  LlvmBuilder builder(entry_block);

  CodegenAnyVal v = CodegenAnyVal::GetNonNullVal(codegen, &builder, type_);
  switch (type_.type) {
    case TYPE_BOOLEAN:
      v.SetVal(value_.bool_val);
      break;
    case TYPE_TINYINT:
      v.SetVal(value_.tinyint_val);
      break;
    case TYPE_SMALLINT:
      v.SetVal(value_.smallint_val);
      break;
    case TYPE_INT:
      v.SetVal(value_.int_val);
      break;
    case TYPE_BIGINT:
      v.SetVal(value_.bigint_val);
      break;
    case TYPE_FLOAT:
      v.SetVal(value_.float_val);
      break;
    case TYPE_DOUBLE:
      v.SetVal(value_.double_val);
      break;
    case TYPE_STRING:
    case TYPE_VARCHAR:
    case TYPE_CHAR:
      v.SetLen(builder.getInt32(value_.string_val.Len()));
      v.SetPtr(codegen->GetStringConstant(
          &builder, value_.string_val.Ptr(), value_.string_val.Len()));
      break;
    case TYPE_DECIMAL:
      switch (type().GetByteSize()) {
        case 4:
          v.SetVal(value_.decimal4_val.value());
          break;
        case 8:
          v.SetVal(value_.decimal8_val.value());
          break;
        case 16:
          v.SetVal(value_.decimal16_val.value());
          break;
        default:
          DCHECK(false) << type_.DebugString();
      }
      break;
    case TYPE_TIMESTAMP:
      v.SetTimeOfDay(builder.getInt64(
          *reinterpret_cast<const int64_t*>(&value_.timestamp_val.time())));
      v.SetDate(builder.getInt32(
          *reinterpret_cast<const int32_t*>(&value_.timestamp_val.date())));