[ nice-Bugs-1286427 ] bytecode uses interfaces too much

Bugs item #1286427, was opened at 2005-09-10 09:49
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Artem Gr Kozarezov (artemgr)
Assigned to: Nobody/Anonymous (nobody)
Summary: bytecode uses interfaces too much

Initial Comment:
Consider an example, hastily taken from a real-life:

public interface SmartResponseData {}
class DeflateOStream extends java.io.OutputStream
implements SmartResponseData {}
public class SmartResponse {
  ?SmartResponseData os = null;
}
public void finish(SmartResponse sr){
  let os = sr.os;
  if (os instanceof DeflateOStream) os.close();
}

The "os.close()" here will emit the
aload_N
instanceof DeflateOStream
ifeq NN
aload_N
checkcast java/io/Closable
invokeinterface java/io/Closable.close
under Nice 0.9.12, Java 1.5.0_04.

java/io/Closable is absent from Java 1.4, therefore the
code which is perfectly compatible with Java 1.4
becames incompatible becouse Nice used a Closable
interface to invoke close.

Nice should have preferred direct invocation of
checkcast DeflateOStream
invoke DeflateOStream.close
or nearest invocation of
checkcast java/io/OutputStream
invoke java/io/OutputStream.close
whereas Nice seems to choose which class to use for
invocation just at random.

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