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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scalac.symtab;
import java.io.IOException;
import scalac.Global;
import scalac.Phase;
import scalac.symtab.Symbol;
import scalac.symtab.Type;
import scalac.util.Debug;
/**
* This class implements common behaviors of lazy types used to load
* symbols from external sources (containing source or compiled code).
*/
public abstract class SymbolLoader extends Type.LazyType {
//########################################################################
// Public Fields
/** The global environment */
public final Global global;
//########################################################################
// Public Constructors
/** Initializes this instance. */
public SymbolLoader(Global global) {
this.global = global;
}
//########################################################################
// Public Methods
/**
* Completes the symbol. More precisely, it completes all related
* symbols of the main class of the symbol. It is guaranteed that
* after this method call all these symbols are initialized (or at
* least that their info does not contain this lazy type).
*
* The main class of a symbol is:
* - the main class of the constructed class, if it's a
* constructor,
* - the main class of the module class, if it's a module,
* - the dual class, if it's a dual module class,
* - itself if it's a non-dual class or a non-module class,
* - undefined otherwise.
*
* The related symbols of a class include:
* - the class itself,
* - its constructor (symbol returned by allConstructors()),
* - its module, if it has one,
* - the related symbols of its dual class, if it's dual
* non-module class.
*/
public final void complete(Symbol symbol) {
Symbol clasz = getMainClass(symbol);
try {
long start = System.currentTimeMillis();
Phase phase = global.currentPhase;
global.currentPhase = global.PHASE.ANALYZER.phase();
String source = doComplete(clasz);
global.currentPhase = phase;
long end = System.currentTimeMillis();
global.operation("loaded " + source + " in " + (end-start) + "ms");
checkValidity(clasz, source, symbol);
} catch (IOException exception) {
if (global.debug) exception.printStackTrace();
String error = "error while loading " + symbol;
String message = exception.getMessage();
error = message != null ? error + ", " + message : "i/o " + error;
global.error(error);
}
initializeAll(clasz);
}
//########################################################################
// Protected Methods
/**
* Performs the actual loading and returns the name of the
* external source. It is guaranteed that the argument of this
* method is always a main class (see also method complete).
*/
protected abstract String doComplete(Symbol clasz) throws IOException;
//########################################################################
// Private Methods
/** Returns the main class of the symbol (see method complete). */
private Symbol getMainClass(Symbol symbol) {
if (symbol.isConstructor())
return getMainClass(symbol.constructorClass());
if (symbol.isModule())
return getMainClass(symbol.moduleClass());
assert symbol.isClassType(): Debug.show(symbol);
if (!symbol.isModuleClass()) return symbol;
return symbol.dualClass().isNone() ? symbol : symbol.dualClass();
}
/**
* Checks that at least the class or its dual class have been
* initialized and signals an error otherwise.
*/
private void checkValidity(Symbol clasz, String source, Symbol s) {
if (clasz.rawInfo() != this) return;
String what;
if (clasz.dualClass().isNone()) {
what = "does not define " + clasz;
} else {
if (clasz.dualClass().rawInfo() != this) return;
Symbol module = clasz.dualClass().module();
what = "defines neither " + clasz + " nor " + module;
}
global.error(source + " " + what);
}
/**
* Initializes all related symbols of the class whose info is this
* instance (see also method complete).
*/
private void initializeAll(Symbol clasz) {
initializeOne(clasz);
initializeOne(clasz.allConstructors());
if (clasz.isModuleClass()) initializeOne(clasz.module());
else if (!clasz.dualClass().isNone()) initializeAll(clasz.dualClass());
}
/** Initializes the symbol if its info is this instance. */
private void initializeOne(Symbol symbol) {
if (symbol.rawInfo() != this) return;
symbol.setInfo(symbol.isModule() ? Type.NoType : Type.ErrorType);
if (symbol.isConstructor()) symbol.flags |= Modifiers.PRIVATE;
}
//########################################################################
}
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