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TargetAddress.cs
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TargetAddress.cs
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using System;
namespace Mono.Debugger
{
// <summary>
// This is used to store an address in the target's address space.
// Addresses are only valid in the target that was used to get them.
//
// You should always use this struct to pass addresses around, it is a
// valuetype and has operators to compare, add, increment, decrement
// addresses.
//
// Note that it is not allowed to compare addresses from different
// targets, you'll get an ArgumentException() if you attempt to do so.
// This is also the reason why you should never use the `Address' property
// unless you know exactly what you're doing: by using this whole valuetype
// to pass addresses around, it'll protect you against accidentally using
// an address in another target.
// </summary>
[Serializable]
public struct TargetAddress : IComparable
{
private ulong address;
private AddressDomain domain;
// <remarks>
// Don't use this in a comparision, use IsNull instead.
// (TargetAddress.Null is in the null domain and comparision between
// different domains is not allowed).
// </remarks>
public static TargetAddress Null = new TargetAddress (null, 0);
// <summary>
// This is not what it looks like.
// Never use this constructor unless you know exactly what you're doing.
// </summary>
public TargetAddress (AddressDomain domain, long address)
{
this.domain = domain;
// FIXME: hack
// address &= 0x00000000ffffffffL;
this.address = (ulong) address;
}
public TargetAddress (AddressDomain domain, Register register)
: this (domain, register.Value)
{
}
// <summary>
// This is not what it looks like.
// Never use this property unless you know exactly what you're doing.
// </summary>
public long Address {
get {
return (long) address;
}
}
// <summary>
// The `domain' in which this address lives.
// Normally, this is in instance of the IInferior object, but it can also
// be anything else. It is used to ensure that addresses are only used in
// the domain they came from.
// </summary>
public AddressDomain Domain {
get {
return domain;
}
}
// <summary>
// Use this to check whether an address is null.
// </summary>
public bool IsNull {
get {
return (address == 0) && (domain == null);
}
}
public override string ToString ()
{
return String.Format ("0x{0}", FormatAddress ((long) address));
}
public static string FormatAddress (long address)
{
int bits = 8;
string saddr = address.ToString ("x");
for (int i = saddr.Length; i < bits; i++)
saddr = "0" + saddr;
return saddr;
}
static void check_domains (TargetAddress a, TargetAddress b)
{
if (a.domain == b.domain)
return;
throw new ArgumentException (String.Format (
"Cannot compare addresses from different domains {0} and {1}",
a.Domain, b.Domain));
}
public int CompareTo (object obj)
{
TargetAddress addr = (TargetAddress) obj;
check_domains (addr, this);
if (address < addr.address)
return -1;
else if (address > addr.address)
return 1;
else
return 0;
}
public override bool Equals (object o)
{
if (o == null || !(o is TargetAddress))
return false;
TargetAddress b = (TargetAddress)o;
return address == b.address;
}
public override int GetHashCode ()
{
return (int)address;
}
//
// Operators
//
public static bool operator < (TargetAddress a, TargetAddress b)
{
check_domains (a, b);
return a.address < b.address;
}
public static bool operator > (TargetAddress a, TargetAddress b)
{
check_domains (a, b);
return a.address > b.address;
}
public static bool operator == (TargetAddress a, TargetAddress b)
{
check_domains (a, b);
return a.Equals (b);
}
public static bool operator != (TargetAddress a, TargetAddress b)
{
check_domains (a, b);
return a.address != b.address;
}
public static bool operator <= (TargetAddress a, TargetAddress b)
{
check_domains (a, b);
return a.address <= b.address;
}
public static bool operator >= (TargetAddress a, TargetAddress b)
{
check_domains (a, b);
return a.address >= b.address;
}
public static TargetAddress operator + (TargetAddress a, long offset)
{
return new TargetAddress (a.domain, (long) (a.address + (ulong) offset));
}
public static TargetAddress operator - (TargetAddress a, long offset)
{
return new TargetAddress (a.domain, (long) (a.address - (ulong) offset));
}
public static TargetAddress operator ++ (TargetAddress a)
{
a.address++;
return a;
}
public static TargetAddress operator -- (TargetAddress a)
{
a.address--;
return a;
}
public static long operator - (TargetAddress a, TargetAddress b)
{
check_domains (a, b);
if (a > b)
return (long) (a.address - b.address);
else
return - (long) (b.address - a.address);
}
}
}