--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/share/opensource/javac/doc/javac_lifecycle/Enter.html Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,90 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<!--
+Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
+DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+
+This code is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License version 2 only, as
+published by the Free Software Foundation. Sun designates this
+particular file as subject to the "Classpath" exception as provided
+by Sun in the LICENSE file that accompanied this code.
+
+This code is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+version 2 for more details (a copy is included in the LICENSE file that
+accompanied this code).
+
+You should have received a copy of the GNU General Public License version
+2 along with this work; if not, write to the Free Software Foundation,
+Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+CA 95054 USA or visit www.sun.com if you need additional information or
+have any questions.
+-->
+
+<html>
+ <head>
+ <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
+ <meta name="author" content="Jonathan Gibbons">
+ <link type="text/css" rel=stylesheet href="style.css">
+ <title>com.sun.tools.javac.comp.Enter</title>
+ </head>
+ <body>
+
+ <h3>com.sun.tools.javac.comp.Enter</h3>
+
+ This enters symbols for all encountered definitions into
+ the symbol table. The pass consists of two phases, organized as
+ follows:
+
+ <ol>
+ <li><p>In the first phase, all class symbols are entered into their
+ enclosing scope, descending recursively down the tree for classes
+ which are members of other classes. The class symbols are given a
+ MemberEnter object as completer.</p></li>
+
+ <p><a name="package-info"></a>In addition,
+ if any <span class=code>package-info.java</span> files are found,
+ containing package annotations, then the TopLevel tree node for
+ the package-info.java file is put on the "to do" as well.
+ </p>
+
+ <li><p>In the second phase, classes are completed using
+ MemberEnter.complete(). Completion might occur on demand, but
+ any classes that are not completed that way will be eventually
+ completed by processing the `uncompleted' queue. Completion
+ entails
+ <ul><li>(1) determination of a class's parameters, supertype and
+ interfaces, as well as <li>(2) entering all symbols defined in the
+ class into its scope, with the exception of class symbols which
+ have been entered in phase 1.</li>
+ </ul>
+ (2) depends on (1) having been
+ completed for a class and all its superclasses and enclosing
+ classes. That's why, after doing (1), we put classes in a
+ `halfcompleted' queue. Only when we have performed (1) for a class
+ and all it's superclasses and enclosing classes, we proceed to
+ (2).</p></li>
+ </ol>
+
+ <p>Whereas the first phase is organized as a sweep through all
+ compiled syntax trees, the second phase is demand. Members of a
+ class are entered when the contents of a class are first
+ accessed. This is accomplished by installing completer objects in
+ class symbols for compiled classes which invoke the member-enter
+ phase for the corresponding class tree.</p>
+
+ <p>Classes migrate from one phase to the next via queues:</p>
+
+ <pre>
+ class enter -> (Enter.uncompleted) --> member enter (1)
+ -> (MemberEnter.halfcompleted) --> member enter (2)
+ -> (Todo) --> attribute
+ (only for toplevel classes)
+ </pre>
+
+ </body>
+</html>
+