Represents a class that emits the instructions that determine whether or not method interception is disabled.
상속: IInstructionEmitter
예제 #1
0
        protected override void Replace(Instruction oldInstruction, MethodDefinition hostMethod,
                                        CilWorker IL)
        {
            var targetMethod = (MethodReference)oldInstruction.Operand;

            var callOriginalMethod = IL.Create(OpCodes.Nop);
            var returnType         = targetMethod.ReturnType.ReturnType;
            var endLabel           = IL.Create(OpCodes.Nop);
            var module             = hostMethod.DeclaringType.Module;

            // Create the stack that will hold the method arguments
            IL.Emit(OpCodes.Newobj, _stackCtor);
            IL.Emit(OpCodes.Stloc, _currentArguments);

            SaveInvocationInfo(IL, targetMethod, module, returnType);

            var getInterceptionDisabled = new GetInterceptionDisabled(hostMethod, _interceptionDisabled);

            getInterceptionDisabled.Emit(IL);

            var surroundMethodBody = new SurroundMethodBody(_methodReplacementProvider, _aroundInvokeProvider,
                                                            _invocationInfo, _interceptionDisabled, _returnValue, typeof(AroundInvokeMethodCallRegistry));

            surroundMethodBody.AddProlog(IL);
            // Use the MethodReplacementProvider attached to the
            // current host instance
            Replace(IL, oldInstruction, targetMethod, hostMethod, endLabel, callOriginalMethod);

            IL.Append(endLabel);

            surroundMethodBody.AddEpilog(IL);
        }
예제 #2
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        /// <summary>
        /// Rewrites the instructions in the target method body.
        /// </summary>
        /// <param name="method">The target method.</param>
        /// <param name="IL">The <see cref="CilWorker"/> instance that represents the method body.</param>
        /// <param name="oldInstructions">The IL instructions of the original method body.</param>
        protected override void RewriteMethodBody(MethodDefinition method, CilWorker IL,
                                                  IEnumerable <Instruction> oldInstructions)
        {
            if (IsExcluded(method))
            {
                AddOriginalInstructions(IL, oldInstructions);
                return;
            }

            VariableDefinition interceptionDisabled      = method.AddLocal <bool>();
            VariableDefinition invocationInfo            = method.AddLocal <IInvocationInfo>();
            VariableDefinition aroundInvokeProvider      = method.AddLocal <IAroundInvokeProvider>();
            VariableDefinition methodReplacementProvider = method.AddLocal <IMethodReplacementProvider>();


            VariableDefinition returnValue = method.AddLocal <object>();
            VariableDefinition classMethodReplacementProvider = method.AddLocal <IMethodReplacementProvider>();

            Func <ModuleDefinition, MethodReference> getInstanceMethodReplacementProviderMethod =
                module => module.Import(typeof(IMethodReplacementHost).GetMethod("get_MethodBodyReplacementProvider"));

            var parameters = new MethodBodyRewriterParameters(IL,
                                                              oldInstructions,
                                                              interceptionDisabled,
                                                              invocationInfo, returnValue,
                                                              methodReplacementProvider,
                                                              aroundInvokeProvider,
                                                              classMethodReplacementProvider,
                                                              getInstanceMethodReplacementProviderMethod,
                                                              typeof(AroundMethodBodyRegistry));

            var emitter = new InvocationInfoEmitter(true);

            IInstructionEmitter getMethodReplacementProvider =
                new GetMethodReplacementProvider(methodReplacementProvider, method,
                                                 getInstanceMethodReplacementProviderMethod);

            IInstructionEmitter getInterceptionDisabled           = new GetInterceptionDisabled(parameters);
            ISurroundMethodBody surroundMethodBody                = new SurroundMethodBody(parameters, "AroundMethodBodyProvider");
            IInstructionEmitter getClassMethodReplacementProvider = new GetClassMethodReplacementProvider(parameters,
                                                                                                          module =>
                                                                                                          module.Import(
                                                                                                              typeof(
                                                                                                                  MethodBodyReplacementProviderRegistry
                                                                                                                  ).
                                                                                                              GetMethod
                                                                                                                  ("GetProvider")));
            IInstructionEmitter addMethodReplacement = new AddMethodReplacementImplementation(parameters);

            var rewriter = new InterceptAndSurroundMethodBody(emitter, getInterceptionDisabled, surroundMethodBody,
                                                              getMethodReplacementProvider,
                                                              getClassMethodReplacementProvider, addMethodReplacement,
                                                              parameters);

            // Determine whether or not the method should be intercepted
            rewriter.Rewrite(method, IL, oldInstructions);
        }
예제 #3
0
        /// <summary>
        /// Rewrites the instructions in the target method body.
        /// </summary>
        /// <param name="method">The target method.</param>
        /// <param name="IL">The <see cref="CilWorker"/> instance that represents the method body.</param>
        /// <param name="oldInstructions">The IL instructions of the original method body.</param>
        protected override void RewriteMethodBody(MethodDefinition method, CilWorker IL,
                                                  IEnumerable<Instruction> oldInstructions)
        {
            if (IsExcluded(method))
            {
                AddOriginalInstructions(IL, oldInstructions);
                return;
            }

            VariableDefinition interceptionDisabled = method.AddLocal<bool>();
            VariableDefinition invocationInfo = method.AddLocal<IInvocationInfo>();
            VariableDefinition aroundInvokeProvider = method.AddLocal<IAroundInvokeProvider>();
            VariableDefinition methodReplacementProvider = method.AddLocal<IMethodReplacementProvider>();

            VariableDefinition returnValue = method.AddLocal<object>();
            VariableDefinition classMethodReplacementProvider = method.AddLocal<IMethodReplacementProvider>();

            Func<ModuleDefinition, MethodReference> getInstanceMethodReplacementProviderMethod =
                module => module.Import(typeof (IMethodReplacementHost).GetMethod("get_MethodBodyReplacementProvider"));

            var parameters = new MethodBodyRewriterParameters(IL,
                                                              oldInstructions,
                                                              interceptionDisabled,
                                                              invocationInfo, returnValue,
                                                              aroundInvokeProvider,
                                                              methodReplacementProvider,
                                                              classMethodReplacementProvider,
                                                              getInstanceMethodReplacementProviderMethod,
                                                              typeof (AroundMethodBodyRegistry));

            var emitter = new InvocationInfoEmitter(true);

            IInstructionEmitter getMethodReplacementProvider =
                new GetMethodReplacementProvider(methodReplacementProvider, method,
                                                 getInstanceMethodReplacementProviderMethod);

            IInstructionEmitter getInterceptionDisabled = new GetInterceptionDisabled(parameters);
            ISurroundMethodBody surroundMethodBody = new SurroundMethodBody(parameters, "AroundMethodBodyProvider");
            IInstructionEmitter getClassMethodReplacementProvider = new GetClassMethodReplacementProvider(parameters,
                                                                                                          module =>
                                                                                                          module.Import(
                                                                                                              typeof (
                                                                                                                  MethodBodyReplacementProviderRegistry
                                                                                                                  ).
                                                                                                                  GetMethod
                                                                                                                  ("GetProvider")));
            IInstructionEmitter addMethodReplacement = new AddMethodReplacementImplementation(parameters);

            var rewriter = new InterceptAndSurroundMethodBody(emitter, getInterceptionDisabled, surroundMethodBody,
                                                              getMethodReplacementProvider,
                                                              getClassMethodReplacementProvider, addMethodReplacement,
                                                              parameters);

            // Determine whether or not the method should be intercepted
            rewriter.Rewrite(method, IL, oldInstructions);
        }
예제 #4
0
        protected override void Replace(Instruction oldInstruction, MethodDefinition hostMethod,
            CilWorker IL)
        {
            var targetMethod = (MethodReference)oldInstruction.Operand;

            var callOriginalMethod = IL.Create(OpCodes.Nop);
            var returnType = targetMethod.ReturnType.ReturnType;
            var endLabel = IL.Create(OpCodes.Nop);
            var module = hostMethod.DeclaringType.Module;

            // Create the stack that will hold the method arguments
            IL.Emit(OpCodes.Newobj, _stackCtor);
            IL.Emit(OpCodes.Stloc, _currentArguments);

            SaveInvocationInfo(IL, targetMethod, module, returnType);

            var getInterceptionDisabled = new GetInterceptionDisabled(hostMethod, _interceptionDisabled);
            getInterceptionDisabled.Emit(IL);

            var surroundMethodBody = new SurroundMethodBody(_methodReplacementProvider, _aroundInvokeProvider,
                                                            _invocationInfo, _interceptionDisabled, _returnValue, typeof(AroundInvokeMethodCallRegistry));

            surroundMethodBody.AddProlog(IL);
            // Use the MethodReplacementProvider attached to the
            // current host instance
            Replace(IL, oldInstruction, targetMethod, hostMethod, endLabel, callOriginalMethod);

            IL.Append(endLabel);

            surroundMethodBody.AddEpilog(IL);
        }