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test/tools/javac/StringsInSwitch/StringSwitches.java@959103a6100f (annotated)

test/tools/javac/StringsInSwitch/StringSwitches.java

Wed, 27 Apr 2016 01:34:52 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:34:52 +0800

changeset 0

959103a6100f

child 2525

2eb010b6cb22

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/langtools/
changeset: 2573:53ca196be1ae
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2009, 2011, 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	* @test
aoqi@0	26	* @bug 6827009 7071246
aoqi@0	27	* @summary Positive tests for strings in switch.
aoqi@0	28	* @author Joseph D. Darcy
aoqi@0	29	*/
aoqi@0	30
aoqi@0	31	public class StringSwitches {
aoqi@0	32
aoqi@0	33	public static void main(String... args) {
aoqi@0	34	int failures = 0;
aoqi@0	35
aoqi@0	36	failures += testPileup();
aoqi@0	37	failures += testSwitchingTwoWays();
aoqi@0	38	failures += testNamedBreak();
aoqi@0	39	failures += testExtraParens();
aoqi@0	40
aoqi@0	41	if (failures > 0) {
aoqi@0	42	throw new RuntimeException();
aoqi@0	43	}
aoqi@0	44	}
aoqi@0	45
aoqi@0	46	/*
aoqi@0	47	* A zero length string and all strings consisting only of the
aoqi@0	48	* zero character \u0000 have a hash code of zero. This method
aoqi@0	49	* maps such strings to the number of times \u0000 appears for 0
aoqi@0	50	* through 6 occurrences.
aoqi@0	51	*/
aoqi@0	52	private static int zeroHashes(String s) {
aoqi@0	53	int result = Integer.MAX_VALUE;
aoqi@0	54	switch(s) {
aoqi@0	55	case "":
aoqi@0	56	return 0;
aoqi@0	57
aoqi@0	58	case "\u0000":
aoqi@0	59	result = 1; break;
aoqi@0	60
aoqi@0	61	case "\u0000\u0000":
aoqi@0	62	return 2;
aoqi@0	63
aoqi@0	64	case "\u0000\u0000\u0000":
aoqi@0	65	result = 3; break;
aoqi@0	66
aoqi@0	67	case "\u0000\u0000\u0000\u0000":
aoqi@0	68	return 4;
aoqi@0	69
aoqi@0	70	case "\u0000\u0000\u0000\u0000\u0000":
aoqi@0	71	result = 5; break;
aoqi@0	72
aoqi@0	73	case "\u0000\u0000\u0000\u0000\u0000\u0000":
aoqi@0	74	return 6;
aoqi@0	75
aoqi@0	76	default:
aoqi@0	77	result = -1;
aoqi@0	78	}
aoqi@0	79	return result;
aoqi@0	80	}
aoqi@0	81
aoqi@0	82	private static int testPileup() {
aoqi@0	83	int failures = 0;
aoqi@0	84	String zero = "";
aoqi@0	85	for(int i = 0; i <= 6; i++, zero += "\u0000") {
aoqi@0	86	int result = zeroHashes(zero);
aoqi@0	87	if (result != i) {
aoqi@0	88	failures++;
aoqi@0	89	System.err.printf("For string \"%s\" unexpectedly got %d instead of %d%n.",
aoqi@0	90	zero, result, i);
aoqi@0	91	}
aoqi@0	92	}
aoqi@0	93
aoqi@0	94	if (zeroHashes("foo") != -1) {
aoqi@0	95	failures++;
aoqi@0	96	System.err.println("Failed to get -1 for input string.");
aoqi@0	97	}
aoqi@0	98
aoqi@0	99	return failures;
aoqi@0	100	}
aoqi@0	101
aoqi@0	102	/**
aoqi@0	103	* Verify that a switch on an enum and a switch with the same
aoqi@0	104	* structure on the string name of an enum compute equivalent
aoqi@0	105	* values.
aoqi@0	106	*/
aoqi@0	107	private static int testSwitchingTwoWays() {
aoqi@0	108	int failures = 0;
aoqi@0	109
aoqi@0	110	for(MetaSynVar msv : MetaSynVar.values()) {
aoqi@0	111	int enumResult = enumSwitch(msv);
aoqi@0	112	int stringResult = stringSwitch(msv.name());
aoqi@0	113
aoqi@0	114	if (enumResult != stringResult) {
aoqi@0	115	failures++;
aoqi@0	116	System.err.printf("One value %s, computed 0x%x with the enum switch " +
aoqi@0	117	"and 0x%x with the string one.%n",
aoqi@0	118	msv, enumResult, stringResult);
aoqi@0	119	}
aoqi@0	120	}
aoqi@0	121
aoqi@0	122	return failures;
aoqi@0	123	}
aoqi@0	124
aoqi@0	125	private static enum MetaSynVar {
aoqi@0	126	FOO,
aoqi@0	127	BAR,
aoqi@0	128	BAZ,
aoqi@0	129	QUX,
aoqi@0	130	QUUX,
aoqi@0	131	QUUUX,
aoqi@0	132	MUMBLE,
aoqi@0	133	FOOBAR;
aoqi@0	134	}
aoqi@0	135
aoqi@0	136	private static int enumSwitch(MetaSynVar msv) {
aoqi@0	137	int result = 0;
aoqi@0	138	switch(msv) {
aoqi@0	139	case FOO:
aoqi@0	140	result |= (1<<0);
aoqi@0	141	// fallthrough:
aoqi@0	142
aoqi@0	143	case BAR:
aoqi@0	144	case BAZ:
aoqi@0	145	result |= (1<<1);
aoqi@0	146	break;
aoqi@0	147
aoqi@0	148	default:
aoqi@0	149	switch(msv) {
aoqi@0	150	case QUX:
aoqi@0	151	result |= (1<<2);
aoqi@0	152	break;
aoqi@0	153
aoqi@0	154	case QUUX:
aoqi@0	155	result |= (1<<3);
aoqi@0	156
aoqi@0	157	default:
aoqi@0	158	result |= (1<<4);
aoqi@0	159	}
aoqi@0	160	result |= (1<<5);
aoqi@0	161	break;
aoqi@0	162
aoqi@0	163	case MUMBLE:
aoqi@0	164	result |= (1<<6);
aoqi@0	165	return result;
aoqi@0	166
aoqi@0	167	case FOOBAR:
aoqi@0	168	result |= (1<<7);
aoqi@0	169	break;
aoqi@0	170	}
aoqi@0	171	result |= (1<<8);
aoqi@0	172	return result;
aoqi@0	173	}
aoqi@0	174
aoqi@0	175	private static int stringSwitch(String msvName) {
aoqi@0	176	int result = 0;
aoqi@0	177	switch(msvName) {
aoqi@0	178	case "FOO":
aoqi@0	179	result |= (1<<0);
aoqi@0	180	// fallthrough:
aoqi@0	181
aoqi@0	182	case "BAR":
aoqi@0	183	case "BAZ":
aoqi@0	184	result |= (1<<1);
aoqi@0	185	break;
aoqi@0	186
aoqi@0	187	default:
aoqi@0	188	switch(msvName) {
aoqi@0	189	case "QUX":
aoqi@0	190	result |= (1<<2);
aoqi@0	191	break;
aoqi@0	192
aoqi@0	193	case "QUUX":
aoqi@0	194	result |= (1<<3);
aoqi@0	195
aoqi@0	196	default:
aoqi@0	197	result |= (1<<4);
aoqi@0	198	}
aoqi@0	199	result |= (1<<5);
aoqi@0	200	break;
aoqi@0	201
aoqi@0	202	case "MUMBLE":
aoqi@0	203	result |= (1<<6);
aoqi@0	204	return result;
aoqi@0	205
aoqi@0	206	case "FOOBAR":
aoqi@0	207	result |= (1<<7);
aoqi@0	208	break;
aoqi@0	209	}
aoqi@0	210	result |= (1<<8);
aoqi@0	211	return result;
aoqi@0	212	}
aoqi@0	213
aoqi@0	214	private static int testNamedBreak() {
aoqi@0	215	int failures = 0;
aoqi@0	216	String[] testStrings = {"a", "b", "c", "d", "e"};
aoqi@0	217	int[] testExpected = { 0b101011, 0b101, 0b100001, 0b101000, 0b10000};
aoqi@0	218
aoqi@0	219	for(int i = 0; i < testStrings.length; i++) {
aoqi@0	220	int expected = testExpected[i];
aoqi@0	221	int result = namedBreak(testStrings[i]);
aoqi@0	222
aoqi@0	223	if (result != expected) {
aoqi@0	224	failures++;
aoqi@0	225
aoqi@0	226	System.err.printf("On input %s, got %d instead of %d.%n",
aoqi@0	227	testStrings[i], result, expected);
aoqi@0	228	}
aoqi@0	229	}
aoqi@0	230
aoqi@0	231	return failures;
aoqi@0	232	}
aoqi@0	233
aoqi@0	234	private static int namedBreak(String s) {
aoqi@0	235	int result = 0;
aoqi@0	236	outer: switch(s) {
aoqi@0	237	case "a":
aoqi@0	238	case "b":
aoqi@0	239	case "c":
aoqi@0	240	result |= (1<<0);
aoqi@0	241	inner: switch(s + s) {
aoqi@0	242	case "aa":
aoqi@0	243	result |= (1<<1);
aoqi@0	244	break inner;
aoqi@0	245
aoqi@0	246	case "cc":
aoqi@0	247	break outer;
aoqi@0	248
aoqi@0	249	default:
aoqi@0	250	result |= (1<<2);
aoqi@0	251	return result;
aoqi@0	252	}
aoqi@0	253
aoqi@0	254	case "d":
aoqi@0	255	result |= (1<<3);
aoqi@0	256	break outer;
aoqi@0	257
aoqi@0	258	default:
aoqi@0	259	return result |= (1<<4);
aoqi@0	260	}
aoqi@0	261	result |= (1<<5);
aoqi@0	262	return result;
aoqi@0	263	}
aoqi@0	264
aoqi@0	265	private static int testExtraParens() {
aoqi@0	266	int failures = 1;
aoqi@0	267	String s = "first";
aoqi@0	268
aoqi@0	269	switch(s) {
aoqi@0	270	case (("first")):
aoqi@0	271	failures = 0;
aoqi@0	272	break;
aoqi@0	273	case ("second"):
aoqi@0	274	throw new RuntimeException("Should not be reached.");
aoqi@0	275	}
aoqi@0	276
aoqi@0	277	return failures;
aoqi@0	278	}
aoqi@0	279	}