AttrContext.java revision 2571:10fc81ac75b4 
1/*
2 * Copyright (c) 1999, 2014, 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
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
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    /**
63     * Are we doing speculative attribution?
64     */
65    boolean isSpeculative = false;
66
67    /** Are arguments to current function applications boxed into an array for varargs?
68     */
69    Resolve.MethodResolutionPhase pendingResolutionPhase = null;
70
71    /** A record of the lint/SuppressWarnings currently in effect
72     */
73    Lint lint;
74
75    /** The variable whose initializer is being attributed
76     * useful for detecting self-references in variable initializers
77     */
78    Symbol enclVar = null;
79
80    /** ResultInfo to be used for attributing 'return' statement expressions
81     * (set by Attr.visitMethod and Attr.visitLambda)
82     */
83    Attr.ResultInfo returnResult = null;
84
85    /** Symbol corresponding to the site of a qualified default super call
86     */
87    Type defaultSuperCallSite = null;
88
89    /** Duplicate this context, replacing scope field and copying all others.
90     */
91    AttrContext dup(WriteableScope scope) {
92        AttrContext info = new AttrContext();
93        info.scope = scope;
94        info.staticLevel = staticLevel;
95        info.isSelfCall = isSelfCall;
96        info.selectSuper = selectSuper;
97        info.pendingResolutionPhase = pendingResolutionPhase;
98        info.lint = lint;
99        info.enclVar = enclVar;
100        info.returnResult = returnResult;
101        info.defaultSuperCallSite = defaultSuperCallSite;
102        info.isSerializable = isSerializable;
103        info.isSpeculative = isSpeculative;
104        return info;
105    }
106
107    /** Duplicate this context, copying all fields.
108     */
109    AttrContext dup() {
110        return dup(scope);
111    }
112
113    public Iterable<Symbol> getLocalElements() {
114        if (scope == null)
115            return List.nil();
116        return scope.getSymbols();
117    }
118
119    boolean lastResolveVarargs() {
120        return pendingResolutionPhase != null &&
121                pendingResolutionPhase.isVarargsRequired();
122    }
123
124    @Override
125    public String toString() {
126        return "AttrContext[" + scope.toString() + "]";
127    }
128}
129