/// <summary>
/// Emits the IL instructions that will store information about the method <paramref name="targetMethod">currently being executed</paramref>
/// and stores the results into the <paramref name="invocationInfo">variable.</paramref>
/// </summary>
/// <param name="emitter">The <see cref="IEmitInvocationInfo"/> instance.</param>
/// <param name="method">The method whose implementation will be intercepted.</param>
/// <param name="targetMethod">The actual method that will contain the resulting instructions.</param>
/// <param name="invocationInfo">The <see cref="VariableDefinition">local variable</see> that will store the current <see cref="IInvocationInfo"/> instance.</param>
public static void Emit(this IEmitInvocationInfo emitter, MethodInfo method, MethodDefinition targetMethod, VariableDefinition invocationInfo)
{
var module = targetMethod.DeclaringType.Module;
var interceptedMethod = module.Import(method);
emitter.Emit(targetMethod, interceptedMethod, invocationInfo);
}
/// <summary>
/// Saves the current <see cref="IExceptionHandlerInfo"/> instance.
/// </summary>
/// <param name="targetMethod">The target method.</param>
/// <param name="emitter">The <see cref="IEmitInvocationInfo"/> instance that will emit the current method context.</param>
private void SaveExceptionInfo(MethodDefinition targetMethod, IEmitInvocationInfo emitter)
{
var IL = targetMethod.GetILGenerator();
var module = IL.GetModule();
emitter.Emit(targetMethod, targetMethod, _invocationInfo);
IL.Emit(OpCodes.Ldloc, _exception);
IL.Emit(OpCodes.Ldloc, _invocationInfo);
var exceptionInfoConstructor = module.ImportConstructor <ExceptionHandlerInfo>(
typeof(Exception),
typeof(IInvocationInfo));
IL.Emit(OpCodes.Newobj, exceptionInfoConstructor);
IL.Emit(OpCodes.Stloc, _exceptionInfo);
var returnType = targetMethod.ReturnType.ReturnType;
if (returnType == _voidType || _returnValue == null)
{
return;
}
// exceptionInfo.ReturnValue = returnValue;
var setReturnValue = module.ImportMethod <IExceptionHandlerInfo>("set_ReturnValue");
IL.Emit(OpCodes.Ldloc, _exceptionInfo);
IL.Emit(OpCodes.Ldloc, _returnValue);
IL.Emit(OpCodes.Callvirt, setReturnValue);
}
/// <summary>
/// Initializes a new instance of the <see cref="InterceptAndSurroundMethodBody"/> class.
/// </summary>
/// <param name="emitter">The emitter that will instantiate the <see cref="IInvocationInfo"/> instance.</param>
/// <param name="getInterceptionDisabled">The emitter that will determine whether or not method interception is enabled.</param>
/// <param name="surroundMethodBody">The <see cref="ISurroundMethodBody"/> instance that will add the epilogs and prologs to the method body.</param>
/// <param name="getInstanceMethodReplacementProvider">The emitter that will obtain the method replacement provider instance.</param>
/// <param name="getClassMethodReplacementProvider">The emitter that will obtain the class-level method replacement provider instance.</param>
/// <param name="addMethodReplacement">The instruction emitter that will add the call to obtain the method body replacement instance. </param>
/// <param name="parameters">The parameters that describe the context of the method body rewrite.</param>
public InterceptAndSurroundMethodBody(IEmitInvocationInfo emitter,
IInstructionEmitter getInterceptionDisabled,
ISurroundMethodBody surroundMethodBody,
IInstructionEmitter getInstanceMethodReplacementProvider,
IInstructionEmitter getClassMethodReplacementProvider,
IInstructionEmitter addMethodReplacement,
IMethodBodyRewriterParameters parameters)
{
_getInterceptionDisabled = getInterceptionDisabled;
_surroundMethodBody = surroundMethodBody;
_getInstanceMethodReplacementProvider = getInstanceMethodReplacementProvider;
_getClassMethodReplacementProvider = getClassMethodReplacementProvider;
_addMethodReplacement = addMethodReplacement;
_parameters = parameters;
_emitter = emitter;
_interceptionDisabled = parameters.InterceptionDisabled;
}
/// <summary>
/// Initializes a new instance of the <see cref="InterceptAndSurroundMethodBody"/> class.
/// </summary>
/// <param name="emitter">The emitter that will instantiate the <see cref="IInvocationInfo"/> instance.</param>
/// <param name="getInterceptionDisabled">The emitter that will determine whether or not method interception is enabled.</param>
/// <param name="surroundMethodBody">The <see cref="ISurroundMethodBody"/> instance that will add the epilogs and prologs to the method body.</param>
/// <param name="getInstanceMethodReplacementProvider">The emitter that will obtain the method replacement provider instance.</param>
/// <param name="getClassMethodReplacementProvider">The emitter that will obtain the class-level method replacement provider instance.</param>
/// <param name="addMethodReplacement">The instruction emitter that will add the call to obtain the method body replacement instance. </param>
/// <param name="parameters">The parameters that describe the context of the method body rewrite.</param>
public InterceptAndSurroundMethodBody(IEmitInvocationInfo emitter,
IInstructionEmitter getInterceptionDisabled,
ISurroundMethodBody surroundMethodBody,
IInstructionEmitter getInstanceMethodReplacementProvider,
IInstructionEmitter getClassMethodReplacementProvider,
IInstructionEmitter addMethodReplacement,
IMethodBodyRewriterParameters parameters)
{
_getInterceptionDisabled = getInterceptionDisabled;
_surroundMethodBody = surroundMethodBody;
_getInstanceMethodReplacementProvider = getInstanceMethodReplacementProvider;
_getClassMethodReplacementProvider = getClassMethodReplacementProvider;
_addMethodReplacement = addMethodReplacement;
_parameters = parameters;
_emitter = emitter;
_interceptionDisabled = parameters.InterceptionDisabled;
}
/// <summary>
/// Saves the current <see cref="IExceptionHandlerInfo"/> instance.
/// </summary>
/// <param name="targetMethod">The target method.</param>
/// <param name="emitter">The <see cref="IEmitInvocationInfo"/> instance that will emit the current method context.</param>
private void SaveExceptionInfo(MethodDefinition targetMethod, IEmitInvocationInfo emitter)
{
var IL = targetMethod.GetILGenerator();
var module = IL.GetModule();
emitter.Emit(targetMethod, targetMethod, _invocationInfo);
IL.Emit(OpCodes.Ldloc, _exception);
IL.Emit(OpCodes.Ldloc, _invocationInfo);
var exceptionInfoConstructor = module.ImportConstructor<ExceptionHandlerInfo>(
typeof (Exception),
typeof (IInvocationInfo));
IL.Emit(OpCodes.Newobj, exceptionInfoConstructor);
IL.Emit(OpCodes.Stloc, _exceptionInfo);
var returnType = targetMethod.ReturnType.ReturnType;
if (returnType == _voidType || _returnValue == null)
return;
// exceptionInfo.ReturnValue = returnValue;
var setReturnValue = module.ImportMethod<IExceptionHandlerInfo>("set_ReturnValue");
IL.Emit(OpCodes.Ldloc, _exceptionInfo);
IL.Emit(OpCodes.Ldloc, _returnValue);
IL.Emit(OpCodes.Callvirt, setReturnValue);
}
/// <summary>
/// Initializes the MethodBodyEmitter class.
/// </summary>
/// <param name="source"></param>
public void Initialize(IServiceContainer source)
{
InvocationInfoEmitter = (IEmitInvocationInfo)source.GetService(typeof(IEmitInvocationInfo));
}
/// <summary>
/// Initializes the MethodBodyEmitter class.
/// </summary>
/// <param name="source"></param>
public void Initialize(IServiceContainer source)
{
InvocationInfoEmitter = (IEmitInvocationInfo) source.GetService(typeof (IEmitInvocationInfo));
}