source: branches/2947_ConfigurableIndexedDataTable/HeuristicLab.ExtLibs/HeuristicLab.Cecil/0.9.5/Mono.Cecil-0.9.5/Mono.Cecil/Mono.Cecil.Cil/MethodBody.cs @ 16148

//
// MethodBody.cs
//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2011 Jb Evain
//
// 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.
//

using System;

using Mono.Collections.Generic;

namespace Mono.Cecil.Cil {

  public sealed class MethodBody : IVariableDefinitionProvider {

    readonly internal MethodDefinition method;

    internal ParameterDefinition this_parameter;
    internal int max_stack_size;
    internal int code_size;
    internal bool init_locals;
    internal MetadataToken local_var_token;

    internal Collection<Instruction> instructions;
    internal Collection<ExceptionHandler> exceptions;
    internal Collection<VariableDefinition> variables;
    Scope scope;

    public MethodDefinition Method {
      get { return method; }
    }

    public int MaxStackSize {
      get { return max_stack_size; }
      set { max_stack_size = value; }
    }

    public int CodeSize {
      get { return code_size; }
    }

    public bool InitLocals {
      get { return init_locals; }
      set { init_locals = value; }
    }

    public MetadataToken LocalVarToken {
      get { return local_var_token; }
      set { local_var_token = value; }
    }

    public Collection<Instruction> Instructions {
      get { return instructions ?? (instructions = new InstructionCollection ()); }
    }

    public bool HasExceptionHandlers {
      get { return !exceptions.IsNullOrEmpty (); }
    }

    public Collection<ExceptionHandler> ExceptionHandlers {
      get { return exceptions ?? (exceptions = new Collection<ExceptionHandler> ()); }
    }

    public bool HasVariables {
      get { return !variables.IsNullOrEmpty (); }
    }

    public Collection<VariableDefinition> Variables {
      get { return variables ?? (variables = new VariableDefinitionCollection ()); }
    }

    public Scope Scope {
      get { return scope; }
      set { scope = value; }
    }

    public ParameterDefinition ThisParameter {
      get {
        if (method == null || method.DeclaringType == null)
          throw new NotSupportedException ();

        return this_parameter ?? (this_parameter = new ParameterDefinition ("0", ParameterAttributes.None, method.DeclaringType));
      }
    }

    public MethodBody (MethodDefinition method)
    {
      this.method = method;
    }

    public ILProcessor GetILProcessor ()
    {
      return new ILProcessor (this);
    }
  }

  public interface IVariableDefinitionProvider {
    bool HasVariables { get; }
    Collection<VariableDefinition> Variables { get; }
  }

  class VariableDefinitionCollection : Collection<VariableDefinition> {

    internal VariableDefinitionCollection ()
    {
    }

    internal VariableDefinitionCollection (int capacity)
      : base (capacity)
    {
    }

    protected override void OnAdd (VariableDefinition item, int index)
    {
      item.index = index;
    }

    protected override void OnInsert (VariableDefinition item, int index)
    {
      item.index = index;

      for (int i = index; i < size; i++)
        items [i].index = i + 1;
    }

    protected override void OnSet (VariableDefinition item, int index)
    {
      item.index = index;
    }

    protected override void OnRemove (VariableDefinition item, int index)
    {
      item.index = -1;

      for (int i = index + 1; i < size; i++)
        items [i].index = i - 1;
    }
  }

  class InstructionCollection : Collection<Instruction> {

    internal InstructionCollection ()
    {
    }

    internal InstructionCollection (int capacity)
      : base (capacity)
    {
    }

    protected override void OnAdd (Instruction item, int index)
    {
      if (index == 0)
        return;

      var previous = items [index - 1];
      previous.next = item;
      item.previous = previous;
    }

    protected override void OnInsert (Instruction item, int index)
    {
      if (size == 0)
        return;

      var current = items [index];
      if (current == null) {
        var last = items [index - 1];
        last.next = item;
        item.previous = last;
        return;
      }

      var previous = current.previous;
      if (previous != null) {
        previous.next = item;
        item.previous = previous;
      }

      current.previous = item;
      item.next = current;
    }

    protected override void OnSet (Instruction item, int index)
    {
      var current = items [index];

      item.previous = current.previous;
      item.next = current.next;

      current.previous = null;
      current.next = null;
    }

    protected override void OnRemove (Instruction item, int index)
    {
      var previous = item.previous;
      if (previous != null)
        previous.next = item.next;

      var next = item.next;
      if (next != null)
        next.previous = item.previous;

      item.previous = null;
      item.next = null;
    }
  }
}