Function exec_stmt_raise

src/pl/plpgsql/src/pl_exec.c:3674–3879

---------- * exec_stmt_raise Build a message and throw it with elog() * ---------- */

 * ----------
 */
static int
exec_stmt_raise(PLpgSQL_execstate *estate, PLpgSQL_stmt_raise *stmt)
{
	int			err_code = 0;
	char	   *condname = NULL;
	char	   *err_message = NULL;
	char	   *err_detail = NULL;
	char	   *err_hint = NULL;
	char	   *err_column = NULL;
	char	   *err_constraint = NULL;
	char	   *err_datatype = NULL;
	char	   *err_table = NULL;
	char	   *err_schema = NULL;
	MemoryContext stmt_mcontext;
	ListCell   *lc;

	/* RAISE with no parameters: re-throw current exception */
	if (stmt->condname == NULL && stmt->message == NULL &&
		stmt->options == NIL)
	{
		if (estate->cur_error != NULL)
			ReThrowError(estate->cur_error);
		/* oops, we're not inside a handler */
		ereport(ERROR,
				(errcode(ERRCODE_STACKED_DIAGNOSTICS_ACCESSED_WITHOUT_ACTIVE_HANDLER),
				 errmsg("RAISE without parameters cannot be used outside an exception handler")));
	}

	/* We'll need to accumulate the various strings in stmt_mcontext */
	stmt_mcontext = get_stmt_mcontext(estate);

	if (stmt->condname)
	{
		err_code = plpgsql_recognize_err_condition(stmt->condname, true);
		condname = MemoryContextStrdup(stmt_mcontext, stmt->condname);
	}

	if (stmt->message)
	{
		StringInfoData ds;
		ListCell   *current_param;
		char	   *cp;
		MemoryContext oldcontext;

		/* build string in stmt_mcontext */
		oldcontext = MemoryContextSwitchTo(stmt_mcontext);
		initStringInfo(&ds);
		MemoryContextSwitchTo(oldcontext);

		current_param = list_head(stmt->params);

		for (cp = stmt->message; *cp; cp++)
		{
			/*
			 * Occurrences of a single % are replaced by the next parameter's
			 * external representation. Double %'s are converted to one %.
			 */
			if (cp[0] == '%')