Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

external/cecil-legacy/Mono.Cecil.Cil/MethodBody.cs

@@ -0,0 +1,241 @@
+//
+// 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 ();
+
+				if (!method.HasThis)
+					return null;
+
+				if (this_parameter != null)
+					return this_parameter;
+
+				var declaring_type = method.DeclaringType;
+				var type = declaring_type.IsValueType || declaring_type.IsPrimitive
+					? new PointerType (declaring_type)
+					: declaring_type as TypeReference;
+
+				return this_parameter = new ParameterDefinition (type, method);
+			}
+		}
+
+		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;
+		}
+	}
+}