--- a/langtools/src/share/opensource/javac/doc/javac_lifecycle/Enter.html Wed Apr 23 14:35:26 2008 +0400
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-<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>
-