/// <summary> /// Generates CIL for the relational operators. /// </summary> /// <param name="generator"> The generator to output the CIL to. </param> /// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param> private void GenerateRelational(ILGenerator generator, OptimizationInfo optimizationInfo) { // Get the statically-determined types of the left and right operands. PrimitiveType leftType = this.Left.ResultType; PrimitiveType rightType = this.Right.ResultType; // The relational operators compare strings if both of the operands are strings. if (leftType == PrimitiveType.String && rightType == PrimitiveType.String) { // Both of the operands are strings. // Load the left hand side operand onto the stack. this.Left.GenerateCode(generator, optimizationInfo); // Load the right hand side operand onto the stack. this.Right.GenerateCode(generator, optimizationInfo); // Compare the two strings. generator.Call(ReflectionHelpers.String_CompareOrdinal); switch (this.OperatorType) { case OperatorType.LessThan: generator.LoadInt32(0); generator.CompareLessThan(); break; case OperatorType.LessThanOrEqual: generator.LoadInt32(1); generator.CompareLessThan(); break; case OperatorType.GreaterThan: generator.LoadInt32(0); generator.CompareGreaterThan(); break; case OperatorType.GreaterThanOrEqual: generator.LoadInt32(-1); generator.CompareGreaterThan(); break; } } else if (leftType == PrimitiveType.Int32 && rightType == PrimitiveType.Int32) { // Both of the operands are integers. // Load the left hand side operand onto the stack. this.Left.GenerateCode(generator, optimizationInfo); // Load the right hand side operand onto the stack. this.Right.GenerateCode(generator, optimizationInfo); // Compare the two numbers. switch (this.OperatorType) { case OperatorType.LessThan: generator.CompareLessThan(); break; case OperatorType.GreaterThan: generator.CompareGreaterThan(); break; case OperatorType.LessThanOrEqual: // a <= b <--> (a > b) == false generator.CompareGreaterThan(); generator.LoadBoolean(false); generator.CompareEqual(); break; case OperatorType.GreaterThanOrEqual: // a >= b <--> (a < b) == false generator.CompareLessThan(); generator.LoadBoolean(false); generator.CompareEqual(); break; } } else if (PrimitiveTypeUtilities.IsNumeric(leftType) || PrimitiveTypeUtilities.IsNumeric(rightType)) { // At least one of the operands is a number. // Load the left hand side operand onto the stack. this.Left.GenerateCode(generator, optimizationInfo); // Convert the operand to a number. EmitConversion.ToNumber(generator, leftType); // Load the right hand side operand onto the stack. this.Right.GenerateCode(generator, optimizationInfo); // Convert the operand to a number. EmitConversion.ToNumber(generator, rightType); // Compare the two numbers. switch (this.OperatorType) { case OperatorType.LessThan: generator.CompareLessThan(); break; case OperatorType.GreaterThan: generator.CompareGreaterThan(); break; case OperatorType.LessThanOrEqual: // a <= b <--> (a > b) == false generator.CompareGreaterThanUnsigned(); generator.LoadBoolean(false); generator.CompareEqual(); break; case OperatorType.GreaterThanOrEqual: // a >= b <--> (a < b) == false generator.CompareLessThanUnsigned(); generator.LoadBoolean(false); generator.CompareEqual(); break; } } else { // It is unknown whether one of the operands is a string. // Load the left hand side operand onto the stack. this.Left.GenerateCode(generator, optimizationInfo); EmitConversion.ToAny(generator, leftType); // Load the right hand side operand onto the stack. this.Right.GenerateCode(generator, optimizationInfo); EmitConversion.ToAny(generator, rightType); switch (this.OperatorType) { case OperatorType.LessThan: generator.Call(ReflectionHelpers.TypeComparer_LessThan); break; case OperatorType.LessThanOrEqual: generator.Call(ReflectionHelpers.TypeComparer_LessThanOrEqual); break; case OperatorType.GreaterThan: generator.Call(ReflectionHelpers.TypeComparer_GreaterThan); break; case OperatorType.GreaterThanOrEqual: generator.Call(ReflectionHelpers.TypeComparer_GreaterThanOrEqual); break; } } }
/// <summary> /// Generates CIL for the relational operators. /// </summary> /// <param name="generator"> The generator to output the CIL to. </param> /// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param> private void GenerateRelational(ILGenerator generator, OptimizationInfo optimizationInfo) { // Get the statically-determined types of the left and right operands. PrimitiveType leftType = this.Left.ResultType; PrimitiveType rightType = this.Right.ResultType; // The relational operators compare strings if both of the operands are strings. if (leftType == PrimitiveType.String && rightType == PrimitiveType.String) { // Both of the operands are strings. // Load the left hand side operand onto the stack. this.Left.GenerateCode(generator, optimizationInfo); // Load the right hand side operand onto the stack. this.Right.GenerateCode(generator, optimizationInfo); // Compare the two strings. generator.Call(ReflectionHelpers.String_CompareOrdinal); switch (this.OperatorType) { case OperatorType.LessThan: generator.LoadInt32(0); generator.CompareLessThan(); break; case OperatorType.LessThanOrEqual: generator.LoadInt32(1); generator.CompareLessThan(); break; case OperatorType.GreaterThan: generator.LoadInt32(0); generator.CompareGreaterThan(); break; case OperatorType.GreaterThanOrEqual: generator.LoadInt32(-1); generator.CompareGreaterThan(); break; } } else if (leftType == PrimitiveType.Int32 && rightType == PrimitiveType.Int32) { // Both of the operands are integers. // Load the left hand side operand onto the stack. this.Left.GenerateCode(generator, optimizationInfo); // Load the right hand side operand onto the stack. this.Right.GenerateCode(generator, optimizationInfo); // Compare the two numbers. switch (this.OperatorType) { case OperatorType.LessThan: generator.CompareLessThan(); break; case OperatorType.GreaterThan: generator.CompareGreaterThan(); break; case OperatorType.LessThanOrEqual: // a <= b <--> (a > b) == false generator.CompareGreaterThan(); generator.LoadBoolean(false); generator.CompareEqual(); break; case OperatorType.GreaterThanOrEqual: // a >= b <--> (a < b) == false generator.CompareLessThan(); generator.LoadBoolean(false); generator.CompareEqual(); break; } } else if (PrimitiveTypeUtilities.IsNumeric(leftType) || PrimitiveTypeUtilities.IsNumeric(rightType)) { // At least one of the operands is a number. // Load the left hand side operand onto the stack. this.Left.GenerateCode(generator, optimizationInfo); // Convert the operand to a number. EmitConversion.ToNumber(generator, leftType); // Load the right hand side operand onto the stack. this.Right.GenerateCode(generator, optimizationInfo); // Convert the operand to a number. EmitConversion.ToNumber(generator, rightType); // Compare the two numbers. switch (this.OperatorType) { case OperatorType.LessThan: generator.CompareLessThan(); break; case OperatorType.GreaterThan: generator.CompareGreaterThan(); break; case OperatorType.LessThanOrEqual: // a <= b <--> (a > b) == false generator.CompareGreaterThanUnsigned(); generator.LoadBoolean(false); generator.CompareEqual(); break; case OperatorType.GreaterThanOrEqual: // a >= b <--> (a < b) == false generator.CompareLessThanUnsigned(); generator.LoadBoolean(false); generator.CompareEqual(); break; } } else { // It is unknown whether one of the operands is a string. // Load the left hand side operand onto the stack. this.Left.GenerateCode(generator, optimizationInfo); EmitConversion.ToAny(generator, leftType); // Load the right hand side operand onto the stack. this.Right.GenerateCode(generator, optimizationInfo); EmitConversion.ToAny(generator, rightType); switch (this.OperatorType) { case OperatorType.LessThan: generator.Call(ReflectionHelpers.TypeComparer_LessThan); break; case OperatorType.LessThanOrEqual: generator.Call(ReflectionHelpers.TypeComparer_LessThanOrEqual); break; case OperatorType.GreaterThan: generator.Call(ReflectionHelpers.TypeComparer_GreaterThan); break; case OperatorType.GreaterThanOrEqual: generator.Call(ReflectionHelpers.TypeComparer_GreaterThanOrEqual); break; } } }