In keeping with the recent coincidental trend of releasing a development snapshot every ten days, here's the next one. This time a got a little side tracked and decided to do some optimizations.

A cute one is that Object.getClass() is now an intrinsic in two specific scenarios. The first scenario is trivial, when it is used to do a null reference check (javac uses this pattern, both in its source and in the code it generates), the second scenario is a little more interesting:

boolean equals(Object other)
{
  if (other.getClass() != this.getClass())
    return false;
  ...
}

Is now compiled into:

boolean equals(Object other)
{
  if (Type.GetTypeHandle(other).Value != Type.GetTypeHandle(this).Value)
    return false;
  ...
}

This removes the need to create (and lookup) the System.Type and java.lang.Class objects entirely.

Changes:

• Added wildcard exports for assemblies referenced by non-main assembly in shared class loader group.
• Intrinsified two uses of Object.getClass().
• Minor optimization to TypeWrapper.ClassObject.
• Added optimization to reflective instantiation to use Activator.CreateInstance() when that is almost as fast as our LCG based implementation (which has a far higher initial cost).
• Removed some unnecessary initializations from java.lang.Class.
• Changed runtime calls to AccessController.doPrivileged() to explicitly pass callerID.
• Added support for multi level stack tracking to CodeEmitter.
• Made most Pop emitting lazy to enable optimizing them away (together with corresponding push).
• Made loading class literal lazy, to enable optimizing them away when they aren't used (e.g. because an atomic intrinsic).
• Made Class.desiredAssertionStatus() into an intrinsic, to be able to optimize it away when -removeassertions is used.
• Avoid constructing AssemblyName objects when reading the export map (it turns out that constructing an AssemblyName is pretty expensive).
• Made the export map reading lazy.

As always with a development snapshot, don't use this in production, but please do try it out and let me know about it. The sources are available in cvs and the binaries here: ikvmbin-0.39.3348.zip