2 // delegate.cs: Delegate Handler
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5 // Ravi Pratap (ravi@ximian.com)
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6 // Miguel de Icaza (miguel@ximian.com)
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8 // Licensed under the terms of the GNU GPL
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10 // (C) 2001 Ximian, Inc (http://www.ximian.com)
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15 using System.Collections;
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16 using System.Reflection;
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17 using System.Reflection.Emit;
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20 namespace Mono.CSharp {
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25 public class Delegate : DeclSpace {
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26 public Expression ReturnType;
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27 public Parameters Parameters;
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28 public Attributes OptAttributes;
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30 public ConstructorBuilder ConstructorBuilder;
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31 public MethodBuilder InvokeBuilder;
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32 public MethodBuilder BeginInvokeBuilder;
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33 public MethodBuilder EndInvokeBuilder;
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35 Type [] param_types;
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38 Expression instance_expr;
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39 MethodBase delegate_method;
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41 const int AllowedModifiers =
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44 Modifiers.PROTECTED |
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45 Modifiers.INTERNAL |
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49 public Delegate (NamespaceEntry ns, TypeContainer parent, Expression type,
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50 int mod_flags, string name, Parameters param_list,
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51 Attributes attrs, Location l)
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52 : base (ns, parent, name, l)
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54 this.ReturnType = type;
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55 ModFlags = Modifiers.Check (AllowedModifiers, mod_flags,
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56 IsTopLevel ? Modifiers.INTERNAL :
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57 Modifiers.PRIVATE, l);
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58 Parameters = param_list;
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59 OptAttributes = attrs;
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62 public override TypeBuilder DefineType ()
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64 if (TypeBuilder != null)
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67 TypeAttributes attr = Modifiers.TypeAttr (ModFlags, IsTopLevel) |
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68 TypeAttributes.Class | TypeAttributes.Sealed;
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71 if (TypeManager.NamespaceClash (Name, Location))
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74 ModuleBuilder builder = CodeGen.ModuleBuilder;
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76 TypeBuilder = builder.DefineType (
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77 Name, attr, TypeManager.multicast_delegate_type);
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79 TypeBuilder builder = Parent.TypeBuilder;
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81 string name = Name.Substring (1 + Name.LastIndexOf ('.'));
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82 TypeBuilder = builder.DefineNestedType (
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83 name, attr, TypeManager.multicast_delegate_type);
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86 TypeManager.AddDelegateType (Name, TypeBuilder, this);
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91 public override bool DefineMembers (TypeContainer container)
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96 public override bool Define (TypeContainer container)
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98 MethodAttributes mattr;
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100 ParameterBuilder pb;
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102 EmitContext ec = new EmitContext (this, this, Location, null,
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103 null, ModFlags, false);
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105 // FIXME: POSSIBLY make this static, as it is always constant
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107 Type [] const_arg_types = new Type [2];
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108 const_arg_types [0] = TypeManager.object_type;
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109 const_arg_types [1] = TypeManager.intptr_type;
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111 mattr = MethodAttributes.RTSpecialName | MethodAttributes.SpecialName |
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112 MethodAttributes.HideBySig | MethodAttributes.Public;
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114 ConstructorBuilder = TypeBuilder.DefineConstructor (mattr,
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115 CallingConventions.Standard,
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118 ConstructorBuilder.DefineParameter (1, ParameterAttributes.None, "object");
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119 ConstructorBuilder.DefineParameter (2, ParameterAttributes.None, "method");
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121 // HACK because System.Reflection.Emit is lame
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124 // FIXME: POSSIBLY make these static, as they are always the same
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125 Parameter [] fixed_pars = new Parameter [2];
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126 fixed_pars [0] = new Parameter (null, null, Parameter.Modifier.NONE, null);
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127 fixed_pars [1] = new Parameter (null, null, Parameter.Modifier.NONE, null);
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128 Parameters const_parameters = new Parameters (fixed_pars, null, Location);
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130 TypeManager.RegisterMethod (
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131 ConstructorBuilder,
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132 new InternalParameters (const_arg_types, const_parameters),
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136 ConstructorBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
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139 // Here the various methods like Invoke, BeginInvoke etc are defined
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141 // First, call the `out of band' special method for
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142 // defining recursively any types we need:
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144 if (!Parameters.ComputeAndDefineParameterTypes (this))
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147 param_types = Parameters.GetParameterInfo (this);
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148 if (param_types == null)
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155 // Check accessibility
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156 foreach (Type partype in param_types){
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157 if (!container.AsAccessible (partype, ModFlags)) {
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158 Report.Error (59, Location,
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159 "Inconsistent accessibility: parameter type `" +
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160 TypeManager.CSharpName (partype) + "` is less " +
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161 "accessible than delegate `" + Name + "'");
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164 if (partype.IsPointer && !UnsafeOK (container))
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168 ReturnType = ResolveTypeExpr (ReturnType, false, Location);
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169 ret_type = ReturnType.Type;
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170 if (ret_type == null)
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173 if (!container.AsAccessible (ret_type, ModFlags)) {
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174 Report.Error (58, Location,
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175 "Inconsistent accessibility: return type `" +
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176 TypeManager.CSharpName (ret_type) + "` is less " +
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177 "accessible than delegate `" + Name + "'");
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181 if (ret_type.IsPointer && !UnsafeOK (container))
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185 // We don't have to check any others because they are all
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186 // guaranteed to be accessible - they are standard types.
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189 CallingConventions cc = Parameters.GetCallingConvention ();
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191 mattr = MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.Virtual;
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193 InvokeBuilder = TypeBuilder.DefineMethod ("Invoke",
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200 // Define parameters, and count out/ref parameters
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202 int out_params = 0;
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204 if (Parameters.FixedParameters != null){
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205 int top = Parameters.FixedParameters.Length;
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208 for (; i < top; i++) {
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209 p = Parameters.FixedParameters [i];
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210 pb = InvokeBuilder.DefineParameter (i+1, p.Attributes, p.Name);
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211 cattr = p.OptAttributes;
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213 Attribute.ApplyAttributes (ec, pb, pb, cattr);
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215 if ((p.ModFlags & Parameter.Modifier.ISBYREF) != 0)
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219 if (Parameters.ArrayParameter != null){
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220 Parameter p = Parameters.ArrayParameter;
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222 pb = InvokeBuilder.DefineParameter (
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223 i+1, p.Attributes, p.Name);
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224 cattr = p.OptAttributes;
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226 Attribute.ApplyAttributes (ec, pb, pb, cattr);
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229 InvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
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231 TypeManager.RegisterMethod (InvokeBuilder,
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232 new InternalParameters (container, Parameters),
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238 int params_num = param_types.Length;
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239 Type [] async_param_types = new Type [params_num + 2];
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241 param_types.CopyTo (async_param_types, 0);
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243 async_param_types [params_num] = TypeManager.asynccallback_type;
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244 async_param_types [params_num + 1] = TypeManager.object_type;
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246 mattr = MethodAttributes.Public | MethodAttributes.HideBySig |
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247 MethodAttributes.Virtual | MethodAttributes.NewSlot;
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249 BeginInvokeBuilder = TypeBuilder.DefineMethod ("BeginInvoke",
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252 TypeManager.iasyncresult_type,
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253 async_param_types);
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256 if (Parameters.FixedParameters != null){
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257 int top = Parameters.FixedParameters.Length;
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260 for (i = 0 ; i < top; i++) {
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261 p = Parameters.FixedParameters [i];
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263 pb = BeginInvokeBuilder.DefineParameter (i+1, p.Attributes, p.Name);
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264 cattr = p.OptAttributes;
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266 Attribute.ApplyAttributes (ec, pb, pb, cattr);
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269 if (Parameters.ArrayParameter != null){
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270 Parameter p = Parameters.ArrayParameter;
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272 pb = BeginInvokeBuilder.DefineParameter (i+1, p.Attributes, p.Name);
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273 cattr = p.OptAttributes;
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275 Attribute.ApplyAttributes (ec, pb, pb, cattr);
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279 BeginInvokeBuilder.DefineParameter (i + 1, ParameterAttributes.None, "callback");
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280 BeginInvokeBuilder.DefineParameter (i + 2, ParameterAttributes.None, "object");
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282 BeginInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
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284 Parameter [] async_params = new Parameter [params_num + 2];
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286 if (Parameters.FixedParameters != null){
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287 Parameters.FixedParameters.CopyTo (async_params, 0);
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288 n = Parameters.FixedParameters.Length;
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290 if (Parameters.ArrayParameter != null)
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291 async_params [n] = Parameters.ArrayParameter;
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293 async_params [params_num] = new Parameter (
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294 TypeManager.system_asynccallback_expr, "callback",
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295 Parameter.Modifier.NONE, null);
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296 async_params [params_num + 1] = new Parameter (
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297 TypeManager.system_object_expr, "object",
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298 Parameter.Modifier.NONE, null);
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300 Parameters async_parameters = new Parameters (async_params, null, Location);
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301 async_parameters.ComputeAndDefineParameterTypes (this);
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303 async_parameters.ComputeAndDefineParameterTypes (this);
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304 TypeManager.RegisterMethod (BeginInvokeBuilder,
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305 new InternalParameters (container, async_parameters),
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306 async_param_types);
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309 // EndInvoke is a bit more interesting, all the parameters labeled as
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310 // out or ref have to be duplicated here.
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313 Type [] end_param_types = new Type [out_params + 1];
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314 Parameter [] end_params = new Parameter [out_params + 1];
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316 if (out_params > 0){
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317 int top = Parameters.FixedParameters.Length;
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318 for (i = 0; i < top; i++){
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319 Parameter p = Parameters.FixedParameters [i];
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320 if ((p.ModFlags & Parameter.Modifier.ISBYREF) == 0)
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323 end_param_types [param] = param_types [i];
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324 end_params [param] = p;
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328 end_param_types [out_params] = TypeManager.iasyncresult_type;
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329 end_params [out_params] = new Parameter (TypeManager.system_iasyncresult_expr, "result", Parameter.Modifier.NONE, null);
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332 // Create method, define parameters, register parameters with type system
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334 EndInvokeBuilder = TypeBuilder.DefineMethod ("EndInvoke", mattr, cc, ret_type, end_param_types);
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335 EndInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
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338 // EndInvoke: Label the parameters
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340 EndInvokeBuilder.DefineParameter (out_params + 1, ParameterAttributes.None, "result");
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341 for (i = 0; i < end_params.Length-1; i++){
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342 EndInvokeBuilder.DefineParameter (i + 1, end_params [i].Attributes, end_params [i].Name);
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345 Parameters end_parameters = new Parameters (end_params, null, Location);
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346 end_parameters.ComputeAndDefineParameterTypes (this);
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348 TypeManager.RegisterMethod (
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350 new InternalParameters (container, end_parameters),
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353 Attribute.ApplyAttributes (ec, TypeBuilder, this, OptAttributes);
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358 /// Verifies whether the method in question is compatible with the delegate
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359 /// Returns the method itself if okay and null if not.
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361 public static MethodBase VerifyMethod (EmitContext ec, Type delegate_type, MethodBase mb,
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364 ParameterData pd = Invocation.GetParameterData (mb);
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366 int pd_count = pd.Count;
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368 Expression ml = Expression.MemberLookup (
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369 ec, delegate_type, "Invoke", loc);
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371 if (!(ml is MethodGroupExpr)) {
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372 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
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376 MethodBase invoke_mb = ((MethodGroupExpr) ml).Methods [0];
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378 ParameterData invoke_pd = Invocation.GetParameterData (invoke_mb);
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380 if (invoke_pd.Count != pd_count)
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383 for (int i = pd_count; i > 0; ) {
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386 if (invoke_pd.ParameterType (i) == pd.ParameterType (i) &&
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387 invoke_pd.ParameterModifier (i) == pd.ParameterModifier (i))
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394 if (((MethodInfo) invoke_mb).ReturnType == ((MethodInfo) mb).ReturnType)
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401 // Verifies whether the invocation arguments are compatible with the
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402 // delegate's target method
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404 public static bool VerifyApplicability (EmitContext ec,
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405 Type delegate_type,
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414 arg_count = args.Count;
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416 Expression ml = Expression.MemberLookup (
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417 ec, delegate_type, "Invoke", loc);
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419 if (!(ml is MethodGroupExpr)) {
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420 Report.Error (-100, loc, "Internal error: could not find Invoke method!" + delegate_type);
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424 MethodBase mb = ((MethodGroupExpr) ml).Methods [0];
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425 ParameterData pd = Invocation.GetParameterData (mb);
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427 int pd_count = pd.Count;
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429 bool not_params_method = (pd_count == 0) ||
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430 (pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS);
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432 if (not_params_method && pd_count != arg_count) {
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433 Report.Error (1593, loc,
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434 "Delegate '" + delegate_type.ToString ()
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435 + "' does not take '" + arg_count + "' arguments");
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439 return Invocation.VerifyArgumentsCompat (ec, args, arg_count, mb, !not_params_method,
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440 delegate_type, loc);
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444 /// Verifies whether the delegate in question is compatible with this one in
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445 /// order to determine if instantiation from the same is possible.
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447 public static bool VerifyDelegate (EmitContext ec, Type delegate_type, Type probe_type, Location loc)
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449 Expression ml = Expression.MemberLookup (
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450 ec, delegate_type, "Invoke", loc);
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452 if (!(ml is MethodGroupExpr)) {
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453 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
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457 MethodBase mb = ((MethodGroupExpr) ml).Methods [0];
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458 ParameterData pd = Invocation.GetParameterData (mb);
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460 Expression probe_ml = Expression.MemberLookup (
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461 ec, delegate_type, "Invoke", loc);
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463 if (!(probe_ml is MethodGroupExpr)) {
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464 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
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468 MethodBase probe_mb = ((MethodGroupExpr) probe_ml).Methods [0];
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469 ParameterData probe_pd = Invocation.GetParameterData (probe_mb);
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471 if (((MethodInfo) mb).ReturnType != ((MethodInfo) probe_mb).ReturnType)
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474 if (pd.Count != probe_pd.Count)
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477 for (int i = pd.Count; i > 0; ) {
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480 if (pd.ParameterType (i) != probe_pd.ParameterType (i) ||
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481 pd.ParameterModifier (i) != probe_pd.ParameterModifier (i))
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488 public static string FullDelegateDesc (Type del_type, MethodBase mb, ParameterData pd)
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490 StringBuilder sb = new StringBuilder (TypeManager.CSharpName (((MethodInfo) mb).ReturnType));
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492 sb.Append (" " + del_type.ToString ());
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495 int length = pd.Count;
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497 for (int i = length; i > 0; ) {
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500 sb.Append (pd.ParameterDesc (length - i - 1));
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506 return sb.ToString ();
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510 // Hack around System.Reflection as found everywhere else
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511 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
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512 MemberFilter filter, object criteria)
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514 ArrayList members = new ArrayList ();
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516 if ((mt & MemberTypes.Method) != 0) {
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517 if (ConstructorBuilder != null)
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518 if (filter (ConstructorBuilder, criteria))
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519 members.Add (ConstructorBuilder);
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521 if (InvokeBuilder != null)
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522 if (filter (InvokeBuilder, criteria))
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523 members.Add (InvokeBuilder);
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525 if (BeginInvokeBuilder != null)
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526 if (filter (BeginInvokeBuilder, criteria))
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527 members.Add (BeginInvokeBuilder);
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529 if (EndInvokeBuilder != null)
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530 if (filter (EndInvokeBuilder, criteria))
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531 members.Add (EndInvokeBuilder);
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534 return new MemberList (members);
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537 public override MemberCache MemberCache {
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543 public Expression InstanceExpression {
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545 return instance_expr;
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548 instance_expr = value;
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552 public MethodBase TargetMethod {
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554 return delegate_method;
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557 delegate_method = value;
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561 public Type TargetReturnType {
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567 public Type [] ParameterTypes {
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569 return param_types;
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575 public class NewDelegate : Expression {
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577 public ArrayList Arguments;
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579 MethodBase constructor_method;
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580 MethodBase delegate_method;
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581 Expression delegate_instance_expr;
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583 public NewDelegate (Type type, ArrayList Arguments, Location loc)
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586 this.Arguments = Arguments;
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590 public override Expression DoResolve (EmitContext ec)
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592 if (Arguments == null || Arguments.Count != 1) {
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593 Report.Error (149, loc,
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594 "Method name expected");
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598 Expression ml = Expression.MemberLookup (
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599 ec, type, ".ctor", loc);
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601 if (!(ml is MethodGroupExpr)) {
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602 Report.Error (-100, loc, "Internal error: Could not find delegate constructor!");
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606 constructor_method = ((MethodGroupExpr) ml).Methods [0];
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607 Argument a = (Argument) Arguments [0];
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609 if (!a.ResolveMethodGroup (ec, Location))
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612 Expression e = a.Expr;
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614 Expression invoke_method = Expression.MemberLookup (
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615 ec, type, "Invoke", MemberTypes.Method,
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616 Expression.AllBindingFlags, loc);
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618 if (invoke_method == null) {
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619 Report.Error (-200, loc, "Internal error ! Could not find Invoke method!");
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623 if (e is MethodGroupExpr) {
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624 MethodGroupExpr mg = (MethodGroupExpr) e;
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626 foreach (MethodInfo mi in mg.Methods){
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627 delegate_method = Delegate.VerifyMethod (ec, type, mi, loc);
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629 if (delegate_method != null)
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633 if (delegate_method == null) {
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634 string method_desc;
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635 if (mg.Methods.Length > 1)
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636 method_desc = mg.Methods [0].Name;
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638 method_desc = Invocation.FullMethodDesc (mg.Methods [0]);
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640 MethodBase dm = ((MethodGroupExpr) invoke_method).Methods [0];
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641 ParameterData param = Invocation.GetParameterData (dm);
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642 string delegate_desc = Delegate.FullDelegateDesc (type, dm, param);
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644 Report.Error (123, loc, "Method '" + method_desc + "' does not " +
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645 "match delegate '" + delegate_desc + "'");
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651 // Check safe/unsafe of the delegate
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654 ParameterData param = Invocation.GetParameterData (delegate_method);
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655 int count = param.Count;
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657 for (int i = 0; i < count; i++){
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658 if (param.ParameterType (i).IsPointer){
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659 Expression.UnsafeError (loc);
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665 if (mg.InstanceExpression != null)
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666 delegate_instance_expr = mg.InstanceExpression.Resolve (ec);
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669 if (!delegate_method.IsStatic){
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670 Report.Error (120, loc,
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671 "An object reference is required for the non-static method " +
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672 delegate_method.Name);
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675 delegate_instance_expr = null;
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677 delegate_instance_expr = ec.GetThis (loc);
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680 if (delegate_instance_expr != null)
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681 if (delegate_instance_expr.Type.IsValueType)
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682 delegate_instance_expr = new BoxedCast (delegate_instance_expr);
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684 eclass = ExprClass.Value;
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688 Type e_type = e.Type;
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690 if (!TypeManager.IsDelegateType (e_type)) {
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691 e.Error_UnexpectedKind ("method");
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695 // This is what MS' compiler reports. We could always choose
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696 // to be more verbose and actually give delegate-level specifics
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698 if (!Delegate.VerifyDelegate (ec, type, e_type, loc)) {
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699 Report.Error (29, loc, "Cannot implicitly convert type '" + e_type + "' " +
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700 "to type '" + type + "'");
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704 delegate_instance_expr = e;
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705 delegate_method = ((MethodGroupExpr) invoke_method).Methods [0];
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707 eclass = ExprClass.Value;
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711 public override void Emit (EmitContext ec)
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713 if (delegate_instance_expr == null ||
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714 delegate_method.IsStatic)
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715 ec.ig.Emit (OpCodes.Ldnull);
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717 delegate_instance_expr.Emit (ec);
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719 if (delegate_method.IsVirtual) {
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720 ec.ig.Emit (OpCodes.Dup);
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721 ec.ig.Emit (OpCodes.Ldvirtftn, (MethodInfo) delegate_method);
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723 ec.ig.Emit (OpCodes.Ldftn, (MethodInfo) delegate_method);
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724 ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) constructor_method);
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728 public class DelegateInvocation : ExpressionStatement {
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730 public Expression InstanceExpr;
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731 public ArrayList Arguments;
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735 public DelegateInvocation (Expression instance_expr, ArrayList args, Location loc)
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737 this.InstanceExpr = instance_expr;
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738 this.Arguments = args;
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742 public override Expression DoResolve (EmitContext ec)
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744 if (InstanceExpr is EventExpr) {
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746 EventInfo ei = ((EventExpr) InstanceExpr).EventInfo;
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748 Expression ml = MemberLookup (
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749 ec, ec.ContainerType, ei.Name,
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750 MemberTypes.Event, AllBindingFlags | BindingFlags.DeclaredOnly, loc);
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754 // If this is the case, then the Event does not belong
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755 // to this Type and so, according to the spec
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756 // cannot be accessed directly
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758 // Note that target will not appear as an EventExpr
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759 // in the case it is being referenced within the same type container;
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760 // it will appear as a FieldExpr in that case.
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763 Assign.error70 (ei, loc);
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769 Type del_type = InstanceExpr.Type;
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770 if (del_type == null)
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773 if (Arguments != null){
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774 foreach (Argument a in Arguments){
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775 if (!a.Resolve (ec, loc))
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780 if (!Delegate.VerifyApplicability (ec, del_type, Arguments, loc))
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783 Expression lookup = Expression.MemberLookup (ec, del_type, "Invoke", loc);
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784 if (!(lookup is MethodGroupExpr)) {
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785 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
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789 method = ((MethodGroupExpr) lookup).Methods [0];
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790 type = ((MethodInfo) method).ReturnType;
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791 eclass = ExprClass.Value;
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796 public override void Emit (EmitContext ec)
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798 Delegate del = TypeManager.LookupDelegate (InstanceExpr.Type);
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801 // Invocation on delegates call the virtual Invoke member
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802 // so we are always `instance' calls
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804 Invocation.EmitCall (ec, false, false, InstanceExpr, method, Arguments, loc);
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807 public override void EmitStatement (EmitContext ec)
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811 // Pop the return value if there is one
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813 if (method is MethodInfo){
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814 if (((MethodInfo) method).ReturnType != TypeManager.void_type)
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815 ec.ig.Emit (OpCodes.Pop);
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