Module openj9.dtfj
Package com.ibm.j9ddr.corereaders.memory

Class BufferedMemory

java.lang.Object
com.ibm.j9ddr.corereaders.memory.SearchableMemory
com.ibm.j9ddr.corereaders.memory.AbstractMemory
com.ibm.j9ddr.corereaders.memory.BufferedMemory
All Implemented Interfaces:
IAddressSpace, IMemory, IProcess
public class BufferedMemory extends AbstractMemory implements IProcess, IAddressSpace
Object representing a single live process model where a section of memory in a the process can be represented in a byte buffer as its source
See Also:
  • invalid reference 
    Can be used for inspection of the
 scc, without the need of a core file
 For example in the following, it is
 used to inspect romMethods:

 
 BufferedMemory memory = new BufferedMemory(ByteOrder.nativeOrder());
 IVMData aVMData = VMDataFactory.getVMData((IProcess)memory);
 //this address denotes the beginning of range of interest, not shown here
 memory.addMemorySource(new BufferedMemorySource(sourceStartAddress, size));
 aVMData.bootstrap("com.ibm.j9ddr.vm29.SomeDebugHandler");

 public class SomeDebugHandler {
         //can fetch this address from a ROMClass Cookie
         J9ROMClassPointer pointer = J9ROMClassPointer.cast(romStartAddress);
         J9ROMMethodPointer romMethod = pointer.romMethods();
         long dumpFlags = (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN) ? 1 : 0;
         J9BCUtil.j9bcutil_dumpRomMethod(System.out, romMethod, pointer, dumpFlags, J9BCUtil.BCUtil_DumpAnnotations);
 }
 

 Behaviour of the model is not defined
 for the case where the underlying source's
 ByteBuffer is modified (address or capacity)
 during use.