harpoon.Analysis.MemOpt
Class PreallocAllocationStrategy

java.lang.Object
  harpoon.Backend.Runtime1.AllocationStrategy
      harpoon.Backend.Runtime1.MallocAllocationStrategy
          harpoon.Backend.Runtime1.BDWAllocationStrategy
              harpoon.Analysis.MemOpt.PreallocAllocationStrategy

All Implemented Interfaces:

Serializable

public class PreallocAllocationStrategy
extends BDWAllocationStrategy

PreallocAllocationStrategy is the allocation strategy for the Static Memory Preallocation Optimization (via Ovy's Incompatibility Analysis). When asked to generate code that allocates memory for an allocation site, it behaves as follows:

• If the AllocationProperties object for that allocation site indicates that the memory space has been preallocated, then generate code that simply reads the static variable that points to the pre-allocated chunk of memory.
• Otherwise, use the standard allocation from BDWAllocationStrategy (yes, the preallocation optimization currently works only with BDW).

Version:

$Id: PreallocAllocationStrategy.java,v 1.7 2003/03/07 20:57:20 salcianu Exp $

Author:

Alexandru Salcianu <salcianu@MIT.edu>

See Also:

Serialized Form

Field Summary

Fields inherited from class harpoon.Backend.Runtime1.MallocAllocationStrategy

frame

Constructor Summary

PreallocAllocationStrategy(Frame f)
Creates a PreallocAllocationStrategy.

Method Summary

Exp	memAlloc(TreeFactory tf, HCodeElement source, DerivationGenerator dg, AllocationInformation.AllocationProperties ap, Exp length) Return a Tree.Exp created with the given TreeFactory that returns a pointer to a piece of memory length bytes long.

Methods inherited from class harpoon.Backend.Runtime1.MallocAllocationStrategy

buildAllocCall, DECLARE, DECLARE

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PreallocAllocationStrategy

public PreallocAllocationStrategy(Frame f)

Creates a PreallocAllocationStrategy.

Method Detail

memAlloc

public Exp memAlloc(TreeFactory tf,
                    HCodeElement source,
                    DerivationGenerator dg,
                    AllocationInformation.AllocationProperties ap,
                    Exp length)

Description copied from class: AllocationStrategy

Return a Tree.Exp created with the given TreeFactory that returns a pointer to a piece of memory length bytes long.

Overrides:

memAlloc in class BDWAllocationStrategy