large number of method locals causes java.lang.InternalError

Name: szC45993 Date: 03/23/97



The following JCK tests fails on JDK1.1.1E:

vm/instr/astore_w/astore_w004/astore_w00401/astore_w00401.html
vm/instr/dload_w/dload_w001/dload_w00101/dload_w00101.html
vm/instr/dstore_w/dstore_w005/dstore_w00501/dstore_w00501.html

The JVM Specification (chapter 4.10 Limitations of the Java
Virtual Machine and class File Format, p. 136) says:

"The number of local variables in a method is limited to 65535 by the
two-byte index operand of many Java Virtual Machine instructions and
the size of the max_locals item of the ClassFile structure ($4.1)."

Test below runs successfully only with locals number <= 1987 and throws
java.lang.InternalError for larger numbers of locals.

Note that JDK1.0.2 and JDK1.1 runs successfully with 65535 locals.

> java -version
java version "1.1.1"
> java -oss5m -verify javasoft.sqe.tests.vm.astore_w.astore_w004.astore_w00401.astore_w00401
java.lang.InternalError
at javasoft.sqe.tests.vm.astore_w.astore_w004.astore_w00401.astore_w00401.main(astore_w00401.jasm)

--------------------- astore_w00401.jasm
//File: @(#)astore_w00401.jasm 1.2 97/01/15
//Copyright 01/15/97 Sun Microsystems, Inc. All Rights Reserved

package javasoft/sqe/tests/vm/astore_w/astore_w004/astore_w00401;

public class astore_w00401 {

public static Method run:"([Ljava/lang/String;Ljava/io/PrintStream;)I"
// stack 2 locals 65535
stack 2 locals 1988
// stack 2 locals 1987
{
aconst_null;
// astore_w 65534;
astore_w 1987;
// astore_w 1986;
        iconst_0;
ireturn;
}

public static Method main:"([Ljava/lang/String;)V"
stack 2 locals 2
{
aload_0;
getstatic Field java/lang/System.out:"Ljava/io/PrintStream;";
invokestatic Method run:"([Ljava/lang/String;Ljava/io/PrintStream;)I";
bipush 95/*STATUS_TEMP*/;
iadd;
invokestatic Method java/lang/System.exit:"(I)V";
return;
}

} // end Class astore_w00401
---------------------

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