AttrContext.java revision 2877:62e285806e83 
1/*
2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24 */
25
26package com.sun.tools.javac.comp;
27
28import com.sun.tools.javac.util.*;
29import com.sun.tools.javac.code.*;
30import com.sun.tools.javac.code.Scope.WriteableScope;
31
32/** Contains information specific to the attribute and enter
33 *  passes, to be used in place of the generic field in environments.
34 *
35 *  <p><b>This is NOT part of any supported API.
36 *  If you write code that depends on this, you do so at your own risk.
37 *  This code and its internal interfaces are subject to change or
38 *  deletion without notice.</b>
39 */
40public class AttrContext {
41
42    /** The scope of local symbols.
43     */
44    WriteableScope scope = null;
45
46    /** The number of enclosing `static' modifiers.
47     */
48    int staticLevel = 0;
49
50    /** Is this an environment for a this(...) or super(...) call?
51     */
52    boolean isSelfCall = false;
53
54    /** Are we evaluating the selector of a `super' or type name?
55     */
56    boolean selectSuper = false;
57
58    /** Is the current target of lambda expression or method reference serializable?
59     */
60    boolean isSerializable = false;
61
62    /** Is this a speculative attribution environment?
63     */
64    boolean isSpeculative = false;
65
66    /**
67     *  Is this an attribution environment for an anonymous class instantiated using <> ?
68     */
69    boolean isAnonymousDiamond = false;
70
71    /**
72     *  Is this an attribution environment for an instance creation expression?
73     */
74    boolean isNewClass = false;
75
76    /** Are arguments to current function applications boxed into an array for varargs?
77     */
78    Resolve.MethodResolutionPhase pendingResolutionPhase = null;
79
80    /** A record of the lint/SuppressWarnings currently in effect
81     */
82    Lint lint;
83
84    /** The variable whose initializer is being attributed
85     * useful for detecting self-references in variable initializers
86     */
87    Symbol enclVar = null;
88
89    /** ResultInfo to be used for attributing 'return' statement expressions
90     * (set by Attr.visitMethod and Attr.visitLambda)
91     */
92    Attr.ResultInfo returnResult = null;
93
94    /** Symbol corresponding to the site of a qualified default super call
95     */
96    Type defaultSuperCallSite = null;
97
98    /** Duplicate this context, replacing scope field and copying all others.
99     */
100    AttrContext dup(WriteableScope scope) {
101        AttrContext info = new AttrContext();
102        info.scope = scope;
103        info.staticLevel = staticLevel;
104        info.isSelfCall = isSelfCall;
105        info.selectSuper = selectSuper;
106        info.pendingResolutionPhase = pendingResolutionPhase;
107        info.lint = lint;
108        info.enclVar = enclVar;
109        info.returnResult = returnResult;
110        info.defaultSuperCallSite = defaultSuperCallSite;
111        info.isSerializable = isSerializable;
112        info.isSpeculative = isSpeculative;
113        info.isAnonymousDiamond = isAnonymousDiamond;
114        info.isNewClass = isNewClass;
115        return info;
116    }
117
118    /** Duplicate this context, copying all fields.
119     */
120    AttrContext dup() {
121        return dup(scope);
122    }
123
124    public Iterable<Symbol> getLocalElements() {
125        if (scope == null)
126            return List.nil();
127        return scope.getSymbols();
128    }
129
130    boolean lastResolveVarargs() {
131        return pendingResolutionPhase != null &&
132                pendingResolutionPhase.isVarargsRequired();
133    }
134
135    @Override
136    public String toString() {
137        return "AttrContext[" + scope.toString() + "]";
138    }
139}
140