Function plpgsql_build_variable

src/pl/plpgsql/src/pl_comp.c:1906–1964

* plpgsql_build_variable - build a datum-array entry of a given * datatype * * The returned struct may be a PLpgSQL_var or PLpgSQL_rec * depending on the given datatype, and is allocated via * palloc. The struct is automatically added to the current datum * array, and optionally to the current namespace. */

 * array, and optionally to the current namespace.
 */
PLpgSQL_variable *
plpgsql_build_variable(const char *refname, int lineno, PLpgSQL_type *dtype,
					   bool add2namespace)
{
	PLpgSQL_variable *result;

	switch (dtype->ttype)
	{
		case PLPGSQL_TTYPE_SCALAR:
			{
				/* Ordinary scalar datatype */
				PLpgSQL_var *var;

				var = palloc0(sizeof(PLpgSQL_var));
				var->dtype = PLPGSQL_DTYPE_VAR;
				var->refname = pstrdup(refname);
				var->lineno = lineno;
				var->datatype = dtype;
				/* other fields are left as 0, might be changed by caller */

				/* preset to NULL */
				var->value = 0;
				var->isnull = true;
				var->freeval = false;

				plpgsql_adddatum((PLpgSQL_datum *) var);
				if (add2namespace)
					plpgsql_ns_additem(PLPGSQL_NSTYPE_VAR,
									   var->dno,
									   refname);
				result = (PLpgSQL_variable *) var;
				break;
			}
		case PLPGSQL_TTYPE_REC:
			{
				/* Composite type -- build a record variable */
				PLpgSQL_rec *rec;

				rec = plpgsql_build_record(refname, lineno,
										   dtype, dtype->typoid,
										   add2namespace);
				result = (PLpgSQL_variable *) rec;
				break;
			}
		case PLPGSQL_TTYPE_PSEUDO:
			ereport(ERROR,
					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
					 errmsg("variable \"%s\" has pseudo-type %s",
							refname, format_type_be(dtype->typoid))));
			result = NULL;		/* keep compiler quiet */
			break;
		default:
			elog(ERROR, "unrecognized ttype: %d", dtype->ttype);
			result = NULL;		/* keep compiler quiet */
			break;
	}

	return result;