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using System;
using Mono.Debugger.Backend;
namespace Mono.Debugger.Languages
{
// <summary>
// This class represents the `location' of a variable. The idea is that we do
// not always have an address for a variable (for instance if it's stored in a
// register) and that an addresses lifetime may be limited.
// </summary>
public abstract class TargetLocation
{
// <summary>
// Whether this variable has an address. A variable may not have an
// address, for instance if it's stored in a register.
// </summary>
internal abstract bool HasAddress {
get;
}
internal abstract TargetAddress GetAddress (TargetMemoryAccess target);
internal virtual TargetBlob ReadMemory (TargetMemoryAccess target, int size)
{
return target.ReadMemory (GetAddress (target), size);
}
// <summary>
// Same than ReadMemory(), but returns a byte[] array.
// </summary>
internal byte[] ReadBuffer (TargetMemoryAccess target, int size)
{
return ReadMemory (target, size).Contents;
}
internal virtual void WriteBuffer (TargetMemoryAccess target, byte[] data)
{
target.WriteBuffer (GetAddress (target), data);
}
internal virtual void WriteAddress (TargetMemoryAccess target, TargetAddress address)
{
target.WriteAddress (GetAddress (target), address);
}
// <summary>
// Clones this location, but adds `offset' to its offset.
// Note that this'll just affect the new location's `Offset' property -
// if you use this for reference types, this won't modify the address
// which gets dereferenced.
// This is usually what you want to access the data at `offset' within
// the variable's contents (for instance to skip a header or access an
// array element).
// </summary>
internal TargetLocation GetLocationAtOffset (long offset)
{
if (offset != 0)
return new RelativeTargetLocation (this, offset);
else
return this;
}
internal TargetLocation GetDereferencedLocation ()
{
return new DereferencedTargetLocation (this);
}
protected virtual string MyToString ()
{
return "";
}
public abstract string Print ();
public override string ToString ()
{
return String.Format ("{0} ({1})", GetType (), MyToString ());
}
}
}
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