C# CodeEmitter.Emit方法代码示例

	internal static bool Emit(DynamicTypeWrapper.FinishContext context, TypeWrapper wrapper, CodeEmitter ilgen, ClassFile classFile, int i, ClassFile.Method.Instruction[] code, InstructionFlags[] flags)
	{
		if (i >= 3
			&& (flags[i - 0] & InstructionFlags.BranchTarget) == 0
			&& (flags[i - 1] & InstructionFlags.BranchTarget) == 0
			&& (flags[i - 2] & InstructionFlags.BranchTarget) == 0
			&& (flags[i - 3] & InstructionFlags.BranchTarget) == 0
			&& code[i - 1].NormalizedOpCode == NormalizedByteCode.__ldc_nothrow
			&& code[i - 2].NormalizedOpCode == NormalizedByteCode.__ldc
			&& code[i - 3].NormalizedOpCode == NormalizedByteCode.__ldc)
		{
			// we now have a structural match, now we need to make sure that the argument values are what we expect
			TypeWrapper tclass = classFile.GetConstantPoolClassType(code[i - 3].Arg1);
			TypeWrapper vclass = classFile.GetConstantPoolClassType(code[i - 2].Arg1);
			string fieldName = classFile.GetConstantPoolConstantString(code[i - 1].Arg1);
			if (tclass == wrapper && !vclass.IsUnloadable && !vclass.IsPrimitive && !vclass.IsNonPrimitiveValueType)
			{
				FieldWrapper field = wrapper.GetFieldWrapper(fieldName, vclass.SigName);
				if (field != null && !field.IsStatic && field.IsVolatile && field.DeclaringType == wrapper && field.FieldTypeWrapper == vclass)
				{
					// everything matches up, now call the actual emitter
					ilgen.Emit(OpCodes.Pop);
					ilgen.Emit(OpCodes.Pop);
					ilgen.Emit(OpCodes.Pop);
					ilgen.Emit(OpCodes.Newobj, context.GetAtomicReferenceFieldUpdater(field));
					return true;
				}
			}
		}
		return false;
	}

		internal static bool Emit(DynamicTypeWrapper.FinishContext context, ClassFile classFile, int constantPoolIndex, ClassFile.ConstantPoolItemInvokeDynamic cpi, CodeEmitter ilgen)
		{
			ClassFile.BootstrapMethod bsm = classFile.GetBootstrapMethod(cpi.BootstrapMethod);
			if (!IsLambdaMetafactory(classFile, bsm) && !IsLambdaAltMetafactory(classFile, bsm))
			{
				return false;
			}
			LambdaMetafactory lmf = context.GetValue<LambdaMetafactory>(constantPoolIndex);
			if (lmf.ctor == null && !lmf.EmitImpl(context, classFile, cpi, bsm, ilgen))
			{
#if STATIC_COMPILER
				if (context.TypeWrapper.GetClassLoader().DisableDynamicBinding)
				{
					StaticCompiler.IssueMessage(Message.UnableToCreateLambdaFactory);
				}
#endif
				return false;
			}
			ilgen.Emit(OpCodes.Newobj, lmf.ctor);
			// the CLR verification rules about type merging mean we have to explicitly cast to the interface type here
			ilgen.Emit(OpCodes.Castclass, cpi.GetRetType().TypeAsBaseType);
			return true;
		}

		protected override void EmitSetImpl(CodeEmitter ilgen)
		{
			ilgen.Emit(OpCodes.Call, setter);
		}

		protected override void EmitGetImpl(CodeEmitter ilgen)
		{
			// Reading a field should trigger the cctor, but since we're inlining the value
			// we have to trigger it explicitly
			DeclaringType.EmitRunClassConstructor(ilgen);

			// NOTE even though you're not supposed to access a constant static final (the compiler is supposed
			// to inline them), we have to support it (because it does happen, e.g. if the field becomes final
			// after the referencing class was compiled, or when we're accessing an unsigned primitive .NET field)
			object v = GetConstantValue();
			if(v == null)
			{
				ilgen.Emit(OpCodes.Ldnull);
			}
			else if(constant is int || 
				constant is short ||
				constant is ushort ||
				constant is byte ||
				constant is sbyte ||
				constant is char ||
				constant is bool)
			{
				ilgen.Emit(OpCodes.Ldc_I4, ((IConvertible)constant).ToInt32(null));
			}
			else if(constant is string)
			{
				ilgen.Emit(OpCodes.Ldstr, (string)constant);
			}
			else if(constant is float)
			{
				ilgen.Emit(OpCodes.Ldc_R4, (float)constant);
			}
			else if(constant is double)
			{
				ilgen.Emit(OpCodes.Ldc_R8, (double)constant);
			}
			else if(constant is long)
			{
				ilgen.Emit(OpCodes.Ldc_I8, (long)constant);
			}
			else if(constant is uint)
			{
				ilgen.Emit(OpCodes.Ldc_I4, unchecked((int)((IConvertible)constant).ToUInt32(null)));
			}
			else if(constant is ulong)
			{
				ilgen.Emit(OpCodes.Ldc_I8, unchecked((long)(ulong)constant));
			}
			else
			{
				throw new InvalidOperationException(constant.GetType().FullName);
			}
		}

				private void EmitRedirect(Type baseType, CodeEmitter ilgen)
				{
					string redirName = m.redirect.Name;
					string redirSig = m.redirect.Sig;
					if(redirName == null)
					{
						redirName = m.Name;
					}
					if(redirSig == null)
					{
						redirSig = m.Sig;
					}
					ClassLoaderWrapper classLoader = DeclaringType.GetClassLoader();
					// HACK if the class name contains a comma, we assume it is a .NET type
					if(m.redirect.Class == null || m.redirect.Class.IndexOf(',') >= 0)
					{
						// TODO better error handling
						Type type = m.redirect.Class == null ? baseType : StaticCompiler.Universe.GetType(m.redirect.Class, true);
						Type[] redirParamTypes = classLoader.ArgTypeListFromSig(redirSig);
						MethodInfo mi = type.GetMethod(m.redirect.Name, redirParamTypes);
						if(mi == null)
						{
							throw new InvalidOperationException();
						}
						ilgen.Emit(OpCodes.Call, mi);
					}
					else
					{
						TypeWrapper tw = classLoader.LoadClassByDottedName(m.redirect.Class);
						MethodWrapper mw = tw.GetMethodWrapper(redirName, redirSig, false);
						if(mw == null)
						{
							throw new InvalidOperationException("Missing redirect method: " + tw.Name + "." + redirName + redirSig);
						}
						mw.Link();
						mw.EmitCall(ilgen);
					}
				}

				private void EmitCallvirtImpl(CodeEmitter ilgen, bool cloneOrFinalizeHack)
				{
					if(mbHelper != null && !cloneOrFinalizeHack)
					{
						ilgen.Emit(OpCodes.Call, mbHelper);
					}
					else
					{
						ilgen.Emit(OpCodes.Callvirt, (MethodInfo)GetMethod());
					}
				}

				internal override void EmitCall(CodeEmitter ilgen)
				{
					if(!IsStatic && IsFinal)
					{
						// When calling a final instance method on a remapped type from a class derived from a .NET class (i.e. a cli.System.Object or cli.System.Exception derived base class)
						// then we can't call the java.lang.Object or java.lang.Throwable methods and we have to go through the instancehelper_ method. Note that since the method
						// is final, this won't affect the semantics.
						EmitCallvirt(ilgen);
					}
					else
					{
						ilgen.Emit(OpCodes.Call, (MethodInfo)GetMethod());
					}
				}

				internal override void EmitNewobj(CodeEmitter ilgen)
				{
					if(mbHelper != null)
					{
						ilgen.Emit(OpCodes.Call, mbHelper);
					}
					else
					{
						ilgen.Emit(OpCodes.Newobj, (ConstructorInfo)GetMethod());
					}
				}

 internal override void EmitInstanceOf(CodeEmitter ilgen)
 {
     if(IsGhost)
     {
         ilgen.Emit(OpCodes.Call, ghostIsInstanceMethod);
     }
     else if(IsGhostArray)
     {
         ilgen.Emit(OpCodes.Call, ghostIsInstanceArrayMethod);
     }
     else
     {
         base.EmitInstanceOf(ilgen);
     }
 }

 internal override void EmitCheckcast(CodeEmitter ilgen)
 {
     if(IsGhost)
     {
         ilgen.Emit(OpCodes.Dup);
         ilgen.Emit(OpCodes.Call, ghostCastMethod);
         ilgen.Emit(OpCodes.Pop);
     }
     else if(IsGhostArray)
     {
         ilgen.Emit(OpCodes.Dup);
         TypeWrapper tw = this;
         int rank = 0;
         while(tw.IsArray)
         {
             rank++;
             tw = tw.ElementTypeWrapper;
         }
         ilgen.EmitLdc_I4(rank);
         ilgen.Emit(OpCodes.Call, ghostCastArrayMethod);
         ilgen.Emit(OpCodes.Castclass, ArrayTypeWrapper.MakeArrayType(Types.Object, rank));
     }
     else
     {
         base.EmitCheckcast(ilgen);
     }
 }

		protected override void NewobjImpl(CodeEmitter ilgen)
		{
			ilgen.Emit(OpCodes.Newobj, stub);
		}

			internal void Emit(IKVM.Internal.MapXml.CodeGenContext context, CodeEmitter ilgen)
			{
				MethodWrapper mwSuppressFillInStackTrace = CoreClasses.java.lang.Throwable.Wrapper.GetMethodWrapper("__<suppressFillInStackTrace>", "()V", false);
				mwSuppressFillInStackTrace.Link();
				ilgen.Emit(OpCodes.Ldarg_0);
				ilgen.Emit(OpCodes.Callvirt, Compiler.getTypeMethod);
				for(int i = 0; i < map.Length; i++)
				{
					ilgen.Emit(OpCodes.Dup);
					ilgen.Emit(OpCodes.Ldtoken, StaticCompiler.Universe.GetType(map[i].src, true));
					ilgen.Emit(OpCodes.Call, Compiler.getTypeFromHandleMethod);
					ilgen.Emit(OpCodes.Ceq);
					CodeEmitterLabel label = ilgen.DefineLabel();
					ilgen.Emit(OpCodes.Brfalse_S, label);
					ilgen.Emit(OpCodes.Pop);
					if(map[i].code != null)
					{
						ilgen.Emit(OpCodes.Ldarg_0);
						if(map[i].code.invoke != null)
						{
							foreach(MapXml.Instruction instr in map[i].code.invoke)
							{
								MapXml.NewObj newobj = instr as MapXml.NewObj;
								if(newobj != null
									&& newobj.Class != null
									&& context.ClassLoader.LoadClassByDottedName(newobj.Class).IsSubTypeOf(CoreClasses.java.lang.Throwable.Wrapper))
								{
									mwSuppressFillInStackTrace.EmitCall(ilgen);
								}
								instr.Generate(context, ilgen);
							}
						}
						ilgen.Emit(OpCodes.Ret);
					}
					else
					{
						TypeWrapper tw = context.ClassLoader.LoadClassByDottedName(map[i].dst);
						MethodWrapper mw = tw.GetMethodWrapper("<init>", "()V", false);
						mw.Link();
						mwSuppressFillInStackTrace.EmitCall(ilgen);
						mw.EmitNewobj(ilgen);
						ilgen.Emit(OpCodes.Ret);
					}
					ilgen.MarkLabel(label);
				}
				ilgen.Emit(OpCodes.Pop);
				ilgen.Emit(OpCodes.Ldarg_0);
				ilgen.Emit(OpCodes.Ret);
			}

		internal override void EmitCallvirt(CodeEmitter ilgen)
		{
			ilgen.Emit(SimpleOpCodeToOpCode(callvirt), (MethodInfo)GetMethod());
		}

		internal static void EmitThrowNoSuchMethodErrorForGetter(CodeEmitter ilgen, TypeWrapper type, bool isStatic)
		{
			// HACK the branch around the throw is to keep the verifier happy
			CodeEmitterLabel label = ilgen.DefineLabel();
			ilgen.Emit(OpCodes.Ldc_I4_0);
			ilgen.Emit(OpCodes.Brtrue_S, label);
			ilgen.EmitThrow("java.lang.NoSuchMethodError");
			ilgen.MarkLabel(label);
			if (!isStatic)
			{
				ilgen.Emit(OpCodes.Pop);
			}
			ilgen.Emit(OpCodes.Ldloc, ilgen.DeclareLocal(type.TypeAsLocalOrStackType));
		}

		protected override void CallvirtImpl(CodeEmitter ilgen)
		{
			ilgen.Emit(SimpleOpCodeToOpCode(callvirt), (MethodInfo)GetMethod());
		}