Can someone clarify what Jetrnio.JET is please ? On 9/8/06, Weldon Washburn <[EMAIL PROTECTED]> wrote:
On 9/8/06, Mikhail Fursov <[EMAIL PROTECTED]> wrote: > > Weldon, > I added 'alloc' support to JIRA 816 (magic2.zip file) > Now it supports objects allocation only, not arrays. MMTk allocation works > only for class named 'test' and methods with prefix 'testAlloc'. To turn > it on use "-Xjit jet::alloc4j" option. Thanks! I will take a look this weekend. I had a problem with implementation: usual 'new' vm helper does vtable field > initialization in allocated object space by itself. Your alloc() method > doesn't. > In the patch in JIRA I added vtable initialization code right after the > alloc() call to JIT, that is actually bad design decision (IMO). You are correct. Its bad design. Writing the vtable pointer is not the responsibility of the JIT. MMTk is somewhat vague on who owns vtable ptr init. In any case, it looks like the jit should follow the call to alloc() with a call to postAlloc(). I will make sure the postAlloc() code fixes up the vtable ptr. Its OK to "bend" the typeRef. All I want is the hard ptr that gets written into the object header. We will go back later and fix this interface hack. See below: /** * Perform post-allocation actions. For many allocators none are * required. * * @param ref The newly allocated object * @param typeRef the type reference for the instance being created * @param bytes The size of the space to be allocated (in bytes) * @param allocator The allocator number to be used for this allocation */ public void postAlloc(ObjectReference ref, ObjectReference typeRef, int bytes, int allocator) throws InlinePragma { Can we replace the 'alloc()' call with another Java method that uses > unboxed API and behaves exactly like 'new' helper? > > +The test in the patch throws NullPointerException because no memory is > allocated in alloc() now and JET tries to write vtable data by NULL > address. > > > > On 9/7/06, Weldon Washburn <[EMAIL PROTECTED]> wrote: > > > > At some point soon we need to go multithread. When can you fix the > > vmmagic > > atomic operations? > > > > I need one more day to estimate the complexity of this move. > > > -- > Mikhail Fursov > > -- Weldon Washburn Intel Middleware Products Division
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