C# Cil.MethodBody类代码示例

        protected BlockStatement RunInternal(MethodBody body, BlockStatement block, ILanguage language)
        {
            try
            {
                if (body.Instructions.Count != 0 || body.Method.IsJustDecompileGenerated)
                {
                    foreach (IDecompilationStep step in steps)
                    {
                        if (language != null && language.IsStopped)
                        {
                            break;
                        }

                        block = step.Process(Context, block);
                    }
                }
            }
            finally
            {
                if (Context.MethodContext.IsMethodBodyChanged)
                {
                    body.Method.RefreshBody();
                }
            }

            return block;
        }

        private static void EmitArchsInit(MethodBody body, FieldReference archRef, Action<Instruction> emit)
        {
            var module = body.Method.Module;
              GenericInstanceType dictStrStrRef = (GenericInstanceType)archRef.FieldType;
              TypeReference dictOpenRef = dictStrStrRef.ElementType;
              GenericInstanceType iEqCompStrRef = new GenericInstanceType(module.Import(typeof(IEqualityComparer<>)));
              iEqCompStrRef.GenericArguments.Add(dictOpenRef.GenericParameters[0]);
              MethodReference dictStrStrCtor = CecilUtils.ImportInstanceMethodRef(module, dictStrStrRef, ".ctor", null, iEqCompStrRef);
              MethodReference dictAddRef = CecilUtils.ImportInstanceMethodRef(module, dictStrStrRef, "Add", null, dictOpenRef.GenericParameters[0], dictOpenRef.GenericParameters[1]);

            // Variables
              body.Variables.Add(new VariableDefinition(dictStrStrRef));
              int varIdx = body.Variables.Count - 1;
            Instruction varSt = CecilUtils.ShortestStloc(varIdx);
            Instruction varLd = CecilUtils.ShortestLdloc(varIdx);

            emit(Instruction.Create(OpCodes.Ldnull));
            emit(Instruction.Create(OpCodes.Newobj, dictStrStrCtor));
              emit(varSt.Clone());
              emit(varLd.Clone());
              emit(Instruction.Create(OpCodes.Stsfld, archRef));
              Action<string, string> emitAddPair = (k, v) =>
              {
              emit(varLd.Clone());
                emit(Instruction.Create(OpCodes.Ldstr, k));
                emit(Instruction.Create(OpCodes.Ldstr, v));
            emit(Instruction.Create(OpCodes.Callvirt, dictAddRef));
              };
              emitAddPair("x86", "Win32");
              emitAddPair("AMD64", "x64");
              emitAddPair("IA64", "Itanium");
              emitAddPair("ARM", "WinCE");
        }

 protected override void ProxyMethod(MethodBody body, MethodReference proceedTargetMethod)
 {
     // Create base call
     if (!Method.IsAbstract)
     {
         callBaseMethod = new MethodDefinition(Name + "$Base", MethodAttributes.Private, Method.ReturnType);
         Method.CopyParameters(callBaseMethod);
         Method.CopyGenericParameters(callBaseMethod);
         callBaseMethod.Body.Emit(il =>
         {
             il.Emit(OpCodes.Ldarg_0);
             for (var i = 0; i < Method.Parameters.Count; i++)
             {
                 il.Emit(OpCodes.Ldarg, (short)i + 1);
             }
             var methodReference = GetProceedMethodTarget();
             if (Method.GenericParameters.Count > 0)
                 methodReference = methodReference.MakeGenericMethod(callBaseMethod.GenericParameters.ToArray());
             il.Emit(OpCodes.Call, methodReference);
             il.Emit(OpCodes.Ret);
         });
         ClassWeaver.ProxyType.Methods.Add(callBaseMethod);
     }
     base.ProxyMethod(body, proceedTargetMethod);
 }

		public override void VisitMethodBody (MethodBody body)
		{
			MethodDefinition meth = body.Method;
			MethodBody methBody = body;
			BinaryReader br = m_reflectReader.Module.ImageReader.MetadataReader.GetDataReader (meth.RVA);

			// lets read the method
			int flags = br.ReadByte ();
			switch (flags & 0x3) {
			case (int) MethodHeader.TinyFormat :
				methBody.CodeSize = flags >> 2;
				methBody.MaxStack = 8;
				ReadCilBody (methBody, br);
				break;
			case (int) MethodHeader.FatFormat :
				br.BaseStream.Position--;
				int fatflags = br.ReadUInt16 ();
				//int headersize = (fatflags >> 12) & 0xf;
				methBody.MaxStack = br.ReadUInt16 ();
				methBody.CodeSize = br.ReadInt32 ();
				methBody.LocalVarToken = br.ReadInt32 ();
				body.InitLocals = (fatflags & (int) MethodHeader.InitLocals) != 0;
				if (methBody.LocalVarToken != 0)
					VisitVariableDefinitionCollection (methBody.Variables);
				ReadCilBody (methBody, br);
				if ((fatflags & (int) MethodHeader.MoreSects) != 0)
					ReadSection (methBody, br);
				break;
			}
		}

        public void Replace(MethodBody currentBody, ICollection<MethodReference> modifiedItems)
        {
            var invalidCalls = _callFilter.GetInvalidCalls(currentBody, modifiedItems);
            if (invalidCalls.Count == 0)
                return;

            var currentInstructions = currentBody.Instructions.Cast<Instruction>().ToArray();
            var stackCtor = _targetModule.ImportConstructor<Stack<object>>(new Type[0]);
            var IL = currentBody.CilWorker;

            var targetMethod = currentBody.Method;
            var currentArgument = targetMethod.AddLocal<object>();
            var currentArguments = targetMethod.AddLocal<Stack<object>>();

            currentBody.Instructions.Clear();

            // Create the stack that will hold the method arguments
            IL.Emit(OpCodes.Newobj, stackCtor);
            IL.Emit(OpCodes.Stloc, currentArguments);
            foreach (var currentInstruction in currentInstructions)
            {
                var currentMethod = currentInstruction.Operand as MethodReference;

                // Ignore any instructions that weren't affected by the
                // interface extraction
                if (currentMethod != null && invalidCalls.ContainsKey(currentMethod))
                {
                    var context = new MethodContext(IL, currentArguments, currentMethod, currentArgument);
                    _replaceMethodCall.Replace(context, _targetModule);
                }

                IL.Append(currentInstruction);
            }
        }

        public override void TerminateMethodBody(MethodBody body)
        {
            long pos = m_binaryWriter.BaseStream.Position;

            if (body.Variables.Count > 0 || body.ExceptionHandlers.Count > 0
                || m_codeWriter.BaseStream.Length >= 64 || body.MaxStack > 8) {

                MethodHeader header = MethodHeader.FatFormat;
                if (body.InitLocals)
                    header |= MethodHeader.InitLocals;
                if (body.ExceptionHandlers.Count > 0)
                    header |= MethodHeader.MoreSects;

                m_binaryWriter.Write ((byte) header);
                m_binaryWriter.Write ((byte) 0x30); // (header size / 4) << 4
                m_binaryWriter.Write ((short) body.MaxStack);
                m_binaryWriter.Write ((int) m_codeWriter.BaseStream.Length);
                m_binaryWriter.Write (((int) TokenType.Signature | body.LocalVarToken));

                WriteExceptionHandlerCollection (body.ExceptionHandlers);
            } else
                m_binaryWriter.Write ((byte) ((byte) MethodHeader.TinyFormat |
                    m_codeWriter.BaseStream.Length << 2));

            m_binaryWriter.Write (m_codeWriter);
            m_binaryWriter.QuadAlign ();

            m_reflectWriter.MetadataWriter.AddData (
                (int) (m_binaryWriter.BaseStream.Position - pos));
        }

		void CreateScopes (MethodBody body, ScopeCollection scopes, SymbolToken localVarToken)
		{
			foreach (Scope s in scopes) {
				int startOffset = s.Start.Offset;
				int endOffset = s.End == body.Instructions.Outside ?
					body.Instructions[body.Instructions.Count - 1].Offset + 1 :
					s.End.Offset;

				m_writer.OpenScope (startOffset);
				m_writer.UsingNamespace (body.Method.DeclaringType.Namespace);
				m_writer.OpenNamespace (body.Method.DeclaringType.Namespace);

				int start = body.Instructions.IndexOf (s.Start);
				int end = s.End == body.Instructions.Outside ?
					body.Instructions.Count - 1 :
					body.Instructions.IndexOf (s.End);

				ArrayList instructions = CollectSequencePoints (body, start, end);
				DefineSequencePoints (instructions);

				CreateLocalVariable (s, startOffset, endOffset, localVarToken);

				CreateScopes (body, s.Scopes, localVarToken);
				m_writer.CloseNamespace ();

				m_writer.CloseScope (endOffset);
			}
		}

		internal DecompilationContext (MethodBody body, ControlFlowGraph cfg)
		{
			this.body = body;
			this.method = body.Method;
			this.variables = CloneCollection (body.Variables);
			this.cfg = cfg;
		}

        /// <summary>
        /// Create a new method in the declaring type of the given implicit implementation with the given name.
        /// This method will call the implicit implementation.
        /// </summary>
        internal static MethodDefinition CreateExplicitStub(MethodDefinition implicitImpl, string name, MethodDefinition iMethod, bool avoidGenericParam)
        {
            // Create method
            var newMethod = new MethodDefinition(name, implicitImpl.Attributes, implicitImpl.ReturnType);
            newMethod.IsVirtual = false;
            newMethod.IsAbstract = false;
            newMethod.IsFinal = true;

            // Clone generic parameters
            foreach (var gp in implicitImpl.GenericParameters)
            {
                newMethod.GenericParameters.Add(new GenericParameter(gp.Name, newMethod));
            }

            // Update according to new context
            var cloner = new TypeCloner(avoidGenericParam, implicitImpl.Module.TypeSystem);
            newMethod.ReturnType = cloner.Get(implicitImpl.ReturnType, newMethod);

            // Clone parameters
            foreach (var p in iMethod.Parameters)
            {
                newMethod.Parameters.Add(new ParameterDefinition(p.Name, p.Attributes, cloner.Get(p.ParameterType, newMethod)));
            }

            // Add the method
            var targetType = implicitImpl.DeclaringType;
            targetType.Methods.Add(newMethod);


            // Add override
            newMethod.Overrides.Add(iMethod);

            // Create method body
            var body = new MethodBody(newMethod);
            newMethod.Body = body;
            var worker = body.GetILProcessor();

            // Push this 
            worker.Emit(OpCodes.Ldarg, body.ThisParameter);
            for (var i = 0; i < implicitImpl.Parameters.Count; i++)
            {
                var p = iMethod.Parameters[i];
                var newMethodParam = newMethod.Parameters[i];
                worker.Emit(OpCodes.Ldarg, newMethodParam);
                if (/*avoidGenericParam &&*/ p.ParameterType.ContainsGenericParameter)
                {
                    worker.Emit(OpCodes.Box, implicitImpl.Parameters[i].ParameterType);
                }
            }
            worker.Emit(implicitImpl.IsVirtual ? OpCodes.Callvirt : OpCodes.Call, implicitImpl);
            worker.Emit(OpCodes.Ret);

            // Mark method reachable
            if (implicitImpl.IsReachable)
            {
                newMethod.SetReachable(null);
            }

            return newMethod;
        }

        private static void SwapMethods(MethodBody body, IEnumerable<Instruction> oldInstructions, IDictionary<MethodReference, MethodReference> methodMap, 
            TypeDefinition targetDependency)
        {
            var IL = body.CilWorker;
            foreach (var instruction in oldInstructions)
            {
                var opCode = instruction.OpCode;
                if (opCode != OpCodes.Call && opCode != OpCodes.Callvirt)
                {
                    IL.Append(instruction);
                    continue;
                }

                var currentMethod = instruction.Operand as MethodReference;
                if (currentMethod == null || !methodMap.ContainsKey(currentMethod))
                {
                    IL.Append(instruction);
                    continue;
                }

                if (currentMethod.DeclaringType != targetDependency)
                {
                    IL.Append(instruction);
                    continue;
                }

                var interfaceMethod = methodMap[currentMethod];
                instruction.Operand = interfaceMethod;
                instruction.OpCode = OpCodes.Callvirt;

                IL.Append(instruction);
            }
        }

        public void Write(MethodBody body, /*Telerik Authorship*/ MetadataToken methodToken, /*Telerik Authorship*/ MetadataToken localVarToken)
        {
            var method = new SourceMethod (body.Method);

            var instructions = GetInstructions (body);
            int count = instructions.Count;
            if (count == 0)
                return;

            var offsets = new int [count];
            var start_rows = new int [count];
            var start_cols = new int [count];

            SourceFile file;
            Populate (instructions, offsets, start_rows, start_cols, out file);

            var builder = writer.OpenMethod (file.CompilationUnit, 0, method);

            for (int i = 0; i < count; i++)
                builder.MarkSequencePoint (
                    offsets [i],
                    file.CompilationUnit.SourceFile,
                    start_rows [i],
                    start_cols [i],
                    false);

            if (body.HasVariables)
                AddVariables (body.Variables);

            writer.CloseMethod ();
        }

 public void VisitMethodBody(MethodBody body)
 {
     this.MethodBody = body;
     //VisitVariableDefinitionCollection(body.Variables);
     //VisitInstructionCollection(body.Instructions);
     //VisitExceptionHandlerCollection(body.ExceptionHandlers);
 }

 public void Write(MethodBody body, byte [][] variables)
 {
     CreateDocuments (body);
     m_writer.OpenMethod (new SymbolToken ((int) body.Method.MetadataToken.ToUInt ()));
     CreateScopes (body, body.Scopes, variables);
     m_writer.CloseMethod ();
 }

 public static bool ContainsCallTo(MethodBody m,
     string methodFullName)
 {
     return m.Instructions.Any(i =>
         (i.OpCode == OpCodes.Call || i.OpCode == OpCodes.Callvirt) &&
         ((MethodReference)i.Operand).FullName == methodFullName);
 }

        public void Write(MethodBody body)
        {
            var method_token = body.Method.MetadataToken;
            var sym_token = new SymbolToken (method_token.ToInt32 ());

            var instructions = CollectInstructions (body);
            if (instructions.Count == 0 && !body.HasVariables)
                return;

            writer.OpenMethod (sym_token);

            DefineSequencePoints (instructions);

            if (body.Scope != null)
                WriteScope (body, body.Scope);
            else
            if (body.HasVariables)
            {
                var start_offset = 0;
                var end_offset = body.CodeSize;

                writer.OpenScope  (start_offset);
                DefineVariables   (body, body.Variables, start_offset, end_offset);
                writer.CloseScope (end_offset);
            }

            if (body.IteratorType != null)
                DefineIteratorType   (sym_token, body.IteratorType.Name);

            if (body.iterator_scopes != null)
                DefineIteratorScopes (sym_token, body.IteratorScopes, body.CodeSize);

            writer.CloseMethod ();
        }