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src/share/classes/com/sun/tools/javac/code/TargetType.java@2eb010b6cb22 (annotated)

src/share/classes/com/sun/tools/javac/code/TargetType.java

Thu, 31 Aug 2017 15:17:03 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:17:03 +0800

changeset 2525

2eb010b6cb22

parent 1563

bc456436c613

parent 0

959103a6100f

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2008, 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. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.tools.javac.code;
aoqi@0	27
aoqi@0	28	import com.sun.tools.javac.util.Assert;
aoqi@0	29
aoqi@0	30	/**
aoqi@0	31	* Describes the type of program element an extended annotation (or extended
aoqi@0	32	* compound attribute) targets.
aoqi@0	33	*
aoqi@0	34	* By comparison, a Tree.Kind has enum values for all elements in the AST, and
aoqi@0	35	* it does not provide enough resolution for type arguments (i.e., whether an
aoqi@0	36	* annotation targets a type argument in a local variable, method return type,
aoqi@0	37	* or a typecast).
aoqi@0	38	*
aoqi@0	39	* <p><b>This is NOT part of any supported API.
aoqi@0	40	* If you write code that depends on this, you do so at your own risk.
aoqi@0	41	* This code and its internal interfaces are subject to change or
aoqi@0	42	* deletion without notice.</b>
aoqi@0	43	*/
aoqi@0	44	// Code duplicated in com.sun.tools.classfile.TypeAnnotation.TargetType
aoqi@0	45	public enum TargetType {
aoqi@0	46	/** For annotations on a class type parameter declaration. */
aoqi@0	47	CLASS_TYPE_PARAMETER(0x00),
aoqi@0	48
aoqi@0	49	/** For annotations on a method type parameter declaration. */
aoqi@0	50	METHOD_TYPE_PARAMETER(0x01),
aoqi@0	51
aoqi@0	52	/** For annotations on the type of an "extends" or "implements" clause. */
aoqi@0	53	CLASS_EXTENDS(0x10),
aoqi@0	54
aoqi@0	55	/** For annotations on a bound of a type parameter of a class. */
aoqi@0	56	CLASS_TYPE_PARAMETER_BOUND(0x11),
aoqi@0	57
aoqi@0	58	/** For annotations on a bound of a type parameter of a method. */
aoqi@0	59	METHOD_TYPE_PARAMETER_BOUND(0x12),
aoqi@0	60
aoqi@0	61	/** For annotations on a field. */
aoqi@0	62	FIELD(0x13),
aoqi@0	63
aoqi@0	64	/** For annotations on a method return type. */
aoqi@0	65	METHOD_RETURN(0x14),
aoqi@0	66
aoqi@0	67	/** For annotations on the method receiver. */
aoqi@0	68	METHOD_RECEIVER(0x15),
aoqi@0	69
aoqi@0	70	/** For annotations on a method parameter. */
aoqi@0	71	METHOD_FORMAL_PARAMETER(0x16),
aoqi@0	72
aoqi@0	73	/** For annotations on a throws clause in a method declaration. */
aoqi@0	74	THROWS(0x17),
aoqi@0	75
aoqi@0	76	/** For annotations on a local variable. */
aoqi@0	77	LOCAL_VARIABLE(0x40, true),
aoqi@0	78
aoqi@0	79	/** For annotations on a resource variable. */
aoqi@0	80	RESOURCE_VARIABLE(0x41, true),
aoqi@0	81
aoqi@0	82	/** For annotations on an exception parameter. */
aoqi@0	83	EXCEPTION_PARAMETER(0x42, true),
aoqi@0	84
aoqi@0	85	/** For annotations on a type test. */
aoqi@0	86	INSTANCEOF(0x43, true),
aoqi@0	87
aoqi@0	88	/** For annotations on an object creation expression. */
aoqi@0	89	NEW(0x44, true),
aoqi@0	90
aoqi@0	91	/** For annotations on a constructor reference receiver. */
aoqi@0	92	CONSTRUCTOR_REFERENCE(0x45, true),
aoqi@0	93
aoqi@0	94	/** For annotations on a method reference receiver. */
aoqi@0	95	METHOD_REFERENCE(0x46, true),
aoqi@0	96
aoqi@0	97	/** For annotations on a typecast. */
aoqi@0	98	CAST(0x47, true),
aoqi@0	99
aoqi@0	100	/** For annotations on a type argument of an object creation expression. */
aoqi@0	101	CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT(0x48, true),
aoqi@0	102
aoqi@0	103	/** For annotations on a type argument of a method call. */
aoqi@0	104	METHOD_INVOCATION_TYPE_ARGUMENT(0x49, true),
aoqi@0	105
aoqi@0	106	/** For annotations on a type argument of a constructor reference. */
aoqi@0	107	CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT(0x4A, true),
aoqi@0	108
aoqi@0	109	/** For annotations on a type argument of a method reference. */
aoqi@0	110	METHOD_REFERENCE_TYPE_ARGUMENT(0x4B, true),
aoqi@0	111
aoqi@0	112	/** For annotations with an unknown target. */
aoqi@0	113	UNKNOWN(0xFF);
aoqi@0	114
aoqi@0	115	private static final int MAXIMUM_TARGET_TYPE_VALUE = 0x4B;
aoqi@0	116
aoqi@0	117	private final int targetTypeValue;
aoqi@0	118	private final boolean isLocal;
aoqi@0	119
aoqi@0	120	private TargetType(int targetTypeValue) {
aoqi@0	121	this(targetTypeValue, false);
aoqi@0	122	}
aoqi@0	123
aoqi@0	124	private TargetType(int targetTypeValue, boolean isLocal) {
aoqi@0	125	if (targetTypeValue < 0
aoqi@0	126	|| targetTypeValue > 255)
aoqi@0	127	Assert.error("Attribute type value needs to be an unsigned byte: " + String.format("0x%02X", targetTypeValue));
aoqi@0	128	this.targetTypeValue = targetTypeValue;
aoqi@0	129	this.isLocal = isLocal;
aoqi@0	130	}
aoqi@0	131
aoqi@0	132	/**
aoqi@0	133	* Returns whether or not this TargetType represents an annotation whose
aoqi@0	134	* target is exclusively a tree in a method body
aoqi@0	135	*
aoqi@0	136	* Note: wildcard bound targets could target a local tree and a class
aoqi@0	137	* member declaration signature tree
aoqi@0	138	*/
aoqi@0	139	public boolean isLocal() {
aoqi@0	140	return isLocal;
aoqi@0	141	}
aoqi@0	142
aoqi@0	143	public int targetTypeValue() {
aoqi@0	144	return this.targetTypeValue;
aoqi@0	145	}
aoqi@0	146
aoqi@0	147	private static final TargetType[] targets;
aoqi@0	148
aoqi@0	149	static {
aoqi@0	150	targets = new TargetType[MAXIMUM_TARGET_TYPE_VALUE + 1];
aoqi@0	151	TargetType[] alltargets = values();
aoqi@0	152	for (TargetType target : alltargets) {
aoqi@0	153	if (target.targetTypeValue != UNKNOWN.targetTypeValue)
aoqi@0	154	targets[target.targetTypeValue] = target;
aoqi@0	155	}
aoqi@0	156	for (int i = 0; i <= MAXIMUM_TARGET_TYPE_VALUE; ++i) {
aoqi@0	157	if (targets[i] == null)
aoqi@0	158	targets[i] = UNKNOWN;
aoqi@0	159	}
aoqi@0	160	}
aoqi@0	161
aoqi@0	162	public static boolean isValidTargetTypeValue(int tag) {
aoqi@0	163	if (tag == UNKNOWN.targetTypeValue)
aoqi@0	164	return true;
aoqi@0	165
aoqi@0	166	return (tag >= 0 && tag < targets.length);
aoqi@0	167	}
aoqi@0	168
aoqi@0	169	public static TargetType fromTargetTypeValue(int tag) {
aoqi@0	170	if (tag == UNKNOWN.targetTypeValue)
aoqi@0	171	return UNKNOWN;
aoqi@0	172
aoqi@0	173	if (tag < 0 || tag >= targets.length)
aoqi@0	174	Assert.error("Unknown TargetType: " + tag);
aoqi@0	175	return targets[tag];
aoqi@0	176	}
aoqi@0	177	}