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test/script/basic/NASHORN-759.js@6d5471a497fb (annotated)

test/script/basic/NASHORN-759.js

Thu, 31 Aug 2017 15:30:47 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:30:47 +0800

changeset 952

6d5471a497fb

parent 7

5a1b0714df0e

parent 0

b1a7da25b547

child 1205

4112748288bb

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*/
aoqi@0	23
aoqi@0	24	/*
aoqi@0	25	* NASHORN-759 - Efficient string concatenation with + operator
aoqi@0	26	*
aoqi@0	27	* @test
aoqi@0	28	* @run
aoqi@0	29	*/
aoqi@0	30
aoqi@0	31	// Check invalidation of callsite for non-string CharSequence
aoqi@0	32	function checkProps(s) {
aoqi@0	33	print(typeof s);
aoqi@0	34	print(typeof s.length);
aoqi@0	35	print(s.charCodeAt === String.prototype.charCodeAt);
aoqi@0	36	print();
aoqi@0	37	}
aoqi@0	38
aoqi@0	39	var s1 = "foo";
aoqi@0	40	var s2 = "bar";
aoqi@0	41	var s3 = s1 + s2 + s1 + s2;
aoqi@0	42	var s4 = new java.lang.StringBuilder("abc");
aoqi@0	43	checkProps(s1);
aoqi@0	44	checkProps(s2);
aoqi@0	45	checkProps(s3);
aoqi@0	46	checkProps(s4);
aoqi@0	47
aoqi@0	48	// Rebuild string and compare to original
aoqi@0	49	function rebuildString(s) {
aoqi@0	50	var buf = s.split("");
aoqi@0	51	print(buf);
aoqi@0	52	while (buf.length > 1) {
aoqi@0	53	var result = [];
aoqi@0	54	buf.reduce(function(previous, current, index) {
aoqi@0	55	if (previous) {
aoqi@0	56	result.push(previous + current);
aoqi@0	57	return null;
aoqi@0	58	} else if (index === buf.length - 1) {
aoqi@0	59	result.push(current);
aoqi@0	60	return null;
aoqi@0	61	} else {
aoqi@0	62	return current;
aoqi@0	63	}
aoqi@0	64	});
aoqi@0	65	buf = result;
aoqi@0	66	print(buf);
aoqi@0	67	}
aoqi@0	68	return buf[0];
aoqi@0	69	}
aoqi@0	70
aoqi@0	71	var n1 = "The quick gray nashorn jumps over the lazy zebra.";
aoqi@0	72	var n2 = rebuildString(n1);
aoqi@0	73	print(n1, n2, n2.length, n1 == n2, n1 === n2, n1 < n2, n1 <= n2, n1 > n2, n1 >= n2);
aoqi@0	74	checkProps(n2);
aoqi@0	75
aoqi@0	76	var n3 = rebuildString(rebuildString(n2));
aoqi@0	77	print(n3, n3.length, n1 == n3, n2 == n3, n1 === n3, n2 === n3);
aoqi@0	78	checkProps(n3);