/*
* MemberLoader.java 1.8 99/02/11 SMI
*
* Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package jcc;
import java.io.PrintStream;
import java.io.InputStream;
import java.io.StreamTokenizer;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Vector;
import java.util.Enumeration;
import util.*;
import components.*;
import util.ClassFile;
/*
* MemberLoader is the Jld subsystem
* which processes the -memberlist option.
* It reads the named file,
* it causes class files to be read if necessary,
* it manipulates the ClassInfo structures
* by marking members to be included.
* and finally it expunges all references to unwanted members.
*/
public class MemberLoader {
String fname;
StreamTokenizer in;
ClassFileFinder finder;
ClassReader rdr;
public MemberLoader( ClassReader r, ClassFileFinder f ){
rdr = r;
finder = f;
}
private ClassInfo enterClass( String classname, Vector v ){
ClassInfo ce;
classname = classname.intern();
ce = components.ClassInfo.lookupClass( classname );
if ( ce != null ) return ce;
if ( rdr.readClass( classname, finder, v ) != 1 ){
//could not find anywhere.
System.err.println(Localizer.getString(
"memberloader.could_not_find_class",
classname));
return null; // or worse...
}
ce = (ClassInfo)( v.lastElement() );
//
// we know that this was loaded on account of us.
// unlike most classes, this one will start life
// as empty, with no members assumed.
ce.flags &= ~(ClassInfo.INCLUDE_ALL);
ce.clearMemberFlags( ClassMemberInfo.INCLUDE );
return ce;
}
private boolean
enterMember( ClassInfo ce, String name ){
if ( (ce.flags&ClassInfo.INCLUDE_ALL) != 0 ){
return true; // doesn't matter what we do anyway!
}
ClassMemberInfo t[];
String sig;
// determine if this is data or method by looking
// at the signature, or lack thereof.
int sigstart = name.indexOf( '(' );
if ( sigstart == -1 ){
// this is data.
// too bad we cannot use the standard procedure
// that components/FMIrefConstant.find() uses,
// but we cannot because the hash ID requires
// data type signature information, which we lack.
t = ce.fields;
sig = null;
} else {
// this is code.
//
sig = name.substring( sigstart );
name = name.substring( 0, sigstart );
t = ce.methods;
}
int l = t.length;
for ( int i = 0; i < l ; i++ ){
if ( t[i].name.string.equals( name ) ){
if ( (sig == null) || sig.equals( t[i].type.string ) ){
t[i].flags |= ClassMemberInfo.INCLUDE;
return true; // done.
}
}
}
System.err.println(Localizer.getString(
"memberloader.could_not_find_member",
ce.className, name));
return false;
}
private void openStream( String name ) throws IOException {
fname = name;
in = new StreamTokenizer(
new java.io.BufferedInputStream(
new java.io.FileInputStream( fname ) ) );
in.resetSyntax();
in.eolIsSignificant( true );
in.whitespaceChars( 0, 0x20 );
in.wordChars( '!', '~' );
in.commentChar('#');
in.ordinaryChar( '.' );
}
private void oops( String lmsg ) throws DataFormatException {
String errmsg = Localizer.getString(
"memberloader.dependence_file_error_near_line",
fname, Integer.toString(in.lineno()));
if ( lmsg != null ){
errmsg += Localizer.getString(lmsg);
}
in = null; // when we bail, close the file.
throw new DataFormatException( errmsg );
}
/*
* Read output of JavaFilter
*/
public void readFromFile( String fname, Vector classlist )throws DataFormatException, IOException{
int t;
openStream(fname);
while ( (t = in.nextToken() ) != StreamTokenizer.TT_EOF ){
/*
* Process a line of input. It may be empty
* or contain only a comment.
* Else there must be a class name.
* If the class name is followed by a .,
* then a member name follows. The name
* will include a signature, if a method is named.
* No signature is needed for data members.
*/
if ( t == StreamTokenizer.TT_EOL )
continue;
String className;
String memberName;
String sig;
if ( t != StreamTokenizer.TT_WORD )
oops("memberloader.missing_classname");
className = in.sval;
ClassInfo ce = enterClass( className, classlist );
if ( (t=in.nextToken()) == StreamTokenizer.TT_EOL ){
continue; // class name only
}
if ( t != '.' ){
oops( "memberloader.syntax_error" );
continue;
}
if ( (t=in.nextToken()) != StreamTokenizer.TT_WORD ){
oops("memberloader.malformed_member_name");
continue;
}
memberName = in.sval;
/*
* Now that we've read the names, process it.
*/
if ( ce != null )
enterMember( ce, memberName );
if ( in.nextToken() != StreamTokenizer.TT_EOL )
oops("memberloader.extra_material");
}
in = null; // close the file.
}
/*
* Traverse the class list.
* Delete unneeded methods!!
*/
private int deleteMembers( ClassMemberInfo mlist[] ){
if ( mlist == null || mlist.length == 0 )
return 0; // trivial case.
int n = mlist.length;
int ndeleted = 0;
for ( int i = 0; i < n; i++ ){
if ( (mlist[i].flags&ClassMemberInfo.INCLUDE) == 0 ){
mlist[i].index = -1; // obvious error value.
mlist[i] = null;
ndeleted+=1;
}
}
return ndeleted;
}
private static void copyNonNull( ClassMemberInfo from[], ClassMemberInfo to[] ){
int n = from.length;
int j = 0;
for ( int i = 0; i < n; i++ ){
if ( from[i] != null ){
from[i].index = j;
to[j++] = from[i];
}
}
}
private void loadMembers( ClassInfo ci ){
int ndeleted = deleteMembers( ci.methods );
if ( ndeleted != 0 ){
int n = ci.methods.length;
MethodInfo newlist[] = new MethodInfo[ n-ndeleted ];
copyNonNull( ci.methods, newlist );
ci.methods = newlist;
}
ndeleted = deleteMembers( ci.fields );
if ( ndeleted != 0 ){
int n = ci.fields.length;
FieldInfo newlist[] = new FieldInfo[ n-ndeleted ];
copyNonNull( ci.fields, newlist );
ci.fields = newlist;
}
}
/*
* This is serious!
* Iterate through all our classes.
* Look at all the members
* When I see one that doesn't have isLoaded set,
* just delete it! This could be very weird!!!
*/
public void deleteUnwantedMembers( Vector classes )
{
Enumeration e = classes.elements();
while ( e.hasMoreElements() ){
ClassInfo ci = (ClassInfo) e.nextElement();
if ( (ci.flags&ClassInfo.INCLUDE_ALL) != 0 )
continue; // a fully-loaded class.
loadMembers( ci );
}
}
}
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