private FieldReference BuildDelegateToken(ClassEmitter proxy)
{
var callback = proxy.CreateStaticField(namingScope.GetUniqueName("callback_" + method.Method.Name), delegateType);
var createDelegate = new MethodInvocationExpression(
null,
DelegateMethods.CreateDelegate,
new TypeTokenExpression(delegateType),
NullExpression.Instance,
new MethodTokenExpression(method.MethodOnTarget));
var bindDelegate = new AssignStatement(callback, new ConvertExpression(delegateType, createDelegate));
proxy.ClassConstructor.CodeBuilder.AddStatement(bindDelegate);
return callback;
}
protected FieldReference CreateOptionsField(ClassEmitter emitter)
{
return emitter.CreateStaticField("proxyGenerationOptions", typeof (ProxyGenerationOptions));
}
protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class, ProxyGenerationOptions options,INamingScope namingScope)
{
var invocationType = invocation;
Trace.Assert(MethodToOverride.IsGenericMethod == invocationType.IsGenericTypeDefinition);
Type[] genericMethodArgs = Type.EmptyTypes;
ConstructorInfo constructor = invocation.GetConstructors()[0];
Expression proxiedMethodTokenExpression;
if (MethodToOverride.IsGenericMethod)
{
// bind generic method arguments to invocation's type arguments
genericMethodArgs = emitter.MethodBuilder.GetGenericArguments();
invocationType = invocationType.MakeGenericType(genericMethodArgs);
constructor = TypeBuilder.GetConstructor(invocationType, constructor);
// Not in the cache: generic method
proxiedMethodTokenExpression = new MethodTokenExpression(MethodToOverride.MakeGenericMethod(genericMethodArgs));
}
else
{
var proxiedMethodToken = @class.CreateStaticField(namingScope.GetUniqueName("token_" + MethodToOverride.Name), typeof(MethodInfo));
@class.ClassConstructor.CodeBuilder.AddStatement(new AssignStatement(proxiedMethodToken, new MethodTokenExpression(MethodToOverride)));
proxiedMethodTokenExpression = proxiedMethodToken.ToExpression();
}
var dereferencedArguments = IndirectReference.WrapIfByRef(emitter.Arguments);
var ctorArguments = GetCtorArguments(@class, namingScope, proxiedMethodTokenExpression, dereferencedArguments);
var invocationLocal = emitter.CodeBuilder.DeclareLocal(invocationType);
emitter.CodeBuilder.AddStatement(new AssignStatement(invocationLocal,
new NewInstanceExpression(constructor, ctorArguments)));
if (MethodToOverride.ContainsGenericParameters)
{
EmitLoadGenricMethodArguments(emitter, MethodToOverride.MakeGenericMethod(genericMethodArgs), invocationLocal);
}
emitter.CodeBuilder.AddStatement(
new ExpressionStatement(new MethodInvocationExpression(invocationLocal, InvocationMethods.Proceed)));
GeneratorUtil.CopyOutAndRefParameters(dereferencedArguments, invocationLocal, MethodToOverride, emitter);
if (MethodToOverride.ReturnType != typeof(void))
{
// Emit code to return with cast from ReturnValue
var getRetVal = new MethodInvocationExpression(invocationLocal, InvocationMethods.GetReturnValue);
emitter.CodeBuilder.AddStatement(new ReturnStatement(new ConvertExpression(emitter.ReturnType, getRetVal)));
}
else
{
emitter.CodeBuilder.AddStatement(new ReturnStatement());
}
return emitter;
}
public void CreateStaticFieldWithAttributes()
{
ClassEmitter emitter = new ClassEmitter(generator.ProxyBuilder.ModuleScope, "Foo", typeof (object), Type.EmptyTypes);
emitter.CreateStaticField("myField", typeof (string), FieldAttributes.FamANDAssem | FieldAttributes.InitOnly);
Type t = emitter.BuildType();
FieldInfo field = t.GetField("myField", BindingFlags.NonPublic | BindingFlags.Static);
Assert.IsNotNull(field);
Assert.AreEqual(FieldAttributes.Static | FieldAttributes.FamANDAssem | FieldAttributes.InitOnly, field.Attributes);
}
protected void SetGenerationOptions (ProxyGenerationOptions options, ClassEmitter emitter)
{
if (proxyGenerationOptions != null)
{
throw new InvalidOperationException ("ProxyGenerationOptions can only be set once.");
}
proxyGenerationOptions = options;
proxyGenerationOptionsField = emitter.CreateStaticField ("proxyGenerationOptions", typeof (ProxyGenerationOptions));
}
protected void AddFieldToCacheMethodTokenAndStatementsToInitialize(
MethodInfo method, ConstructorEmitter typeInitializerConstructor, ClassEmitter classEmitter)
{
if (!method2TokenField.ContainsKey(method))
{
FieldReference fieldCache =
classEmitter.CreateStaticField("tokenCache" + fieldCount++, typeof(MethodInfo));
method2TokenField.Add(method, fieldCache);
typeInitializerConstructor.CodeBuilder.AddStatement(
new AssignStatement(fieldCache, new MethodTokenExpression(method)));
}
}
/// <summary>
/// Improvement: this cache should be static. We should generate a
/// type constructor instead
/// </summary>
protected void CreateInitializeCacheMethodBody(
Type targetType, MethodInfo[] methods, ClassEmitter classEmitter, ConstructorEmitter typeInitializerConstructor)
{
typeTokenField = classEmitter.CreateStaticField("typeTokenCache", typeof(Type));
typeInitializerConstructor.CodeBuilder.AddStatement(
new AssignStatement(typeTokenField, new TypeTokenExpression(targetType)));
CacheMethodTokens(classEmitter, methods, typeInitializerConstructor);
}
protected override MethodEmitter BuildProxiedMethodBody(MethodEmitter emitter, ClassEmitter @class,
ProxyGenerationOptions options, INamingScope namingScope)
{
var invocationType = invocation;
Trace.Assert(MethodToOverride.IsGenericMethod == invocationType.IsGenericTypeDefinition());
var genericArguments = TypeExtender.EmptyTypes;
var constructor = invocation.GetConstructors()[0];
Expression proxiedMethodTokenExpression;
if (MethodToOverride.IsGenericMethod)
{
// bind generic method arguments to invocation's type arguments
genericArguments = emitter.MethodBuilder.GetGenericArguments();
invocationType = invocationType.MakeGenericType(genericArguments);
constructor = TypeBuilder.GetConstructor(invocationType, constructor);
// Not in the cache: generic method
proxiedMethodTokenExpression = new MethodTokenExpression(MethodToOverride.MakeGenericMethod(genericArguments));
}
else
{
var proxiedMethodToken = @class.CreateStaticField(namingScope.GetUniqueName("token_" + MethodToOverride.Name),
typeof(MethodInfo));
@class.ClassConstructor.CodeBuilder.AddStatement(new AssignStatement(proxiedMethodToken,
new MethodTokenExpression(MethodToOverride)));
proxiedMethodTokenExpression = proxiedMethodToken.ToExpression();
}
var dereferencedArguments = IndirectReference.WrapIfByRef(emitter.Arguments);
var hasByRefArguments = HasByRefArguments(emitter.Arguments);
var arguments = GetCtorArguments(@class, namingScope, proxiedMethodTokenExpression,
dereferencedArguments);
var ctorArguments = ModifyArguments(@class, arguments);
var invocationLocal = emitter.CodeBuilder.DeclareLocal(invocationType);
emitter.CodeBuilder.AddStatement(new AssignStatement(invocationLocal,
new NewInstanceExpression(constructor, ctorArguments)));
if (MethodToOverride.ContainsGenericParameters)
{
EmitLoadGenricMethodArguments(emitter, MethodToOverride.MakeGenericMethod(genericArguments), invocationLocal);
}
if (hasByRefArguments)
{
emitter.CodeBuilder.AddStatement(new TryStatement());
}
var proceed = new ExpressionStatement(new MethodInvocationExpression(invocationLocal, InvocationMethods.Proceed));
emitter.CodeBuilder.AddStatement(proceed);
if (hasByRefArguments)
{
emitter.CodeBuilder.AddStatement(new FinallyStatement());
}
GeneratorUtil.CopyOutAndRefParameters(dereferencedArguments, invocationLocal, MethodToOverride, emitter);
if (hasByRefArguments)
{
emitter.CodeBuilder.AddStatement(new EndExceptionBlockStatement());
}
if (MethodToOverride.ReturnType != typeof(void))
{
// Emit code to return with cast from ReturnValue
// @mbrit - 2012-05-31 - see the note associated with the GetReturnValueForWinRt declaration
// for more information on this...
var useWinRtGenericHandler = false;
#if NETFX_CORE
if (emitter.ReturnType == typeof(int) || emitter.ReturnType == typeof(bool))
useWinRtGenericHandler = true;
#endif
if(!(useWinRtGenericHandler))
{
var getRetVal = new MethodInvocationExpression(invocationLocal, InvocationMethods.GetReturnValue);
emitter.CodeBuilder.AddStatement(new ReturnStatement(new ConvertExpression(emitter.ReturnType, getRetVal)));
}
else
{
#if NETFX_CORE
var grvArgs = new Type[] { emitter.ReturnType };
var grvCall = InvocationMethods.GetReturnValueForWinRt.MakeGenericMethod(grvArgs);
var getRetVal = new MethodInvocationExpression(invocationLocal, grvCall);
emitter.CodeBuilder.AddStatement(new ReturnStatement(getRetVal));
#endif
}
}
else
{
emitter.CodeBuilder.AddStatement(new ReturnStatement());
}
return emitter;
}
protected void CreateOptionsField(ClassEmitter emitter)
{
proxyGenerationOptionsField = emitter.CreateStaticField("proxyGenerationOptions", typeof(ProxyGenerationOptions));
}