Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/linker/cecil/Mono.Cecil.Cil/MethodBody.cs

@@ -0,0 +1,248 @@
+//
+// Author:
+//   Jb Evain (jbevain@gmail.com)
+//
+// Copyright (c) 2008 - 2015 Jb Evain
+// Copyright (c) 2008 - 2011 Novell, Inc.
+//
+// Licensed under the MIT/X11 license.
+//
+
+using System;
+using System.Threading;
+
+using Mono.Collections.Generic;
+
+namespace Mono.Cecil.Cil {
+
+	public sealed class MethodBody {
+
+		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;
+
+		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 (method)); }
+		}
+
+		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 ParameterDefinition ThisParameter {
+			get {
+				if (method == null || method.DeclaringType == null)
+					throw new NotSupportedException ();
+
+				if (!method.HasThis)
+					return null;
+
+				if (this_parameter == null)
+					Interlocked.CompareExchange (ref this_parameter, CreateThisParameter (method), null);
+
+				return this_parameter;
+			}
+		}
+
+		static ParameterDefinition CreateThisParameter (MethodDefinition method)
+		{
+			var parameter_type = method.DeclaringType as TypeReference;
+
+			if (parameter_type.HasGenericParameters) {
+				var instance = new GenericInstanceType (parameter_type);
+				for (int i = 0; i < parameter_type.GenericParameters.Count; i++)
+					instance.GenericArguments.Add (parameter_type.GenericParameters [i]);
+
+				parameter_type = instance;
+
+			}
+
+			if (parameter_type.IsValueType || parameter_type.IsPrimitive)
+				parameter_type = new ByReferenceType (parameter_type);
+
+			return new ParameterDefinition (parameter_type, method);
+		}
+
+		public MethodBody (MethodDefinition method)
+		{
+			this.method = method;
+		}
+
+		public ILProcessor GetILProcessor ()
+		{
+			return new ILProcessor (this);
+		}
+	}
+
+	sealed 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> {
+
+		readonly MethodDefinition method;
+
+		internal InstructionCollection (MethodDefinition method)
+		{
+			this.method = method;
+		}
+
+		internal InstructionCollection (MethodDefinition method, int capacity)
+			: base (capacity)
+		{
+			this.method = method;
+		}
+
+		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;
+
+			RemoveSequencePoint (item);
+
+			item.previous = null;
+			item.next = null;
+		}
+
+		void RemoveSequencePoint (Instruction instruction)
+		{
+			var debug_info = method.debug_info;
+			if (debug_info == null || !debug_info.HasSequencePoints)
+				return;
+
+			var sequence_points = debug_info.sequence_points;
+			for (int i = 0; i < sequence_points.Count; i++) {
+				if (sequence_points [i].Offset == instruction.offset) {
+					sequence_points.RemoveAt (i);
+					return;
+				}
+			}
+		}
+	}
+}