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//
// StackInfo.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2011 Alexander Chebaturkin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
namespace Mono.CodeContracts.Static.Analysis.StackAnalysis {
struct StackInfo {
private StackInfo<object> stack;
public int Depth {
get { return this.stack.Depth; }
}
public object this [int offset] {
get { return this.stack [offset]; }
}
public StackInfo (int depth, int capacity)
{
this.stack = new StackInfo<object> (depth, capacity);
}
private StackInfo (StackInfo<object> copy)
{
this.stack = copy;
}
public StackInfo Pop (int slots)
{
return new StackInfo (this.stack.Pop (slots));
}
public StackInfo Push ()
{
this.stack.Push (null);
return this;
}
public StackInfo PushThis ()
{
this.stack.Push (true);
return this;
}
public StackInfo Push<T> (T target)
{
this.stack.Push (target);
return this;
}
public void Adjust (int delta)
{
if (delta == 0)
return;
if (delta < 0)
this.stack.Pop (-delta);
for (int i = 0; i < delta; ++i)
Push ();
}
public bool IsThis (int offset)
{
return As<bool> (offset);
}
public bool TryGet<T> (int offset, out T target)
{
object o = this [offset];
if (o is T) {
target = (T) o;
return true;
}
target = default(T);
return false;
}
private T As<T> (int offset)
{
T res;
TryGetTarget (offset, out res);
return res;
}
public StackInfo Clone ()
{
return new StackInfo (new StackInfo<object> (this.stack));
}
public override string ToString ()
{
return this.stack.ToString ();
}
public bool TryGetTarget<T> (int offset, out T target)
{
if (this [offset] is T) {
target = (T) this [offset];
return true;
}
target = default(T);
return false;
}
}
}
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