mirror of
https://github.com/SSCLI/sscli_20021101
synced 2026-06-08 12:28:57 +00:00
yallie
363 lines
15 KiB
C#
363 lines
15 KiB
C#
// ==++==
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//
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//
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// Copyright (c) 2002 Microsoft Corporation. All rights reserved.
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//
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// The use and distribution terms for this software are contained in the file
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// named license.txt, which can be found in the root of this distribution.
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// By using this software in any fashion, you are agreeing to be bound by the
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// terms of this license.
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//
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// You must not remove this notice, or any other, from this software.
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//
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//
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// ==--==
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namespace Microsoft.JScript
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{
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using Microsoft.JScript.Vsa;
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using System;
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using System.Reflection;
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using System.Reflection.Emit;
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using System.Diagnostics;
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public class Equality : BinaryOp{
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private Object metaData = null;
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internal Equality(Context context, AST operand1, AST operand2, JSToken operatorTok)
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: base(context, operand1, operand2, operatorTok) {
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}
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public Equality(int operatorTok)
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: base(null, null, null, (JSToken)operatorTok){
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}
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internal override Object Evaluate(){
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bool result = this.EvaluateEquality(this.operand1.Evaluate(), this.operand2.Evaluate(), VsaEngine.executeForJSEE);
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if (this.operatorTok == JSToken.Equal)
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return result;
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else
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return !result;
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}
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#if !DEBUG
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[DebuggerStepThroughAttribute]
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[DebuggerHiddenAttribute]
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#endif
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public bool EvaluateEquality(Object v1, Object v2){
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return EvaluateEquality(v1, v2, false);
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}
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#if !DEBUG
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[DebuggerStepThroughAttribute]
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[DebuggerHiddenAttribute]
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#endif
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private bool EvaluateEquality(Object v1, Object v2, bool checkForDebuggerObjects){
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if (v1 is String && v2 is String) return v1.Equals(v2);
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if (v1 is Int32 && v2 is Int32) return ((int)v1) == (int)v2;
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if (v1 is Double && v2 is Double) return ((double)v1) == (double)v2;
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if ((v2 == null || v2 is DBNull || v2 is Missing) && !checkForDebuggerObjects) return (v1 == null || v1 is DBNull || v1 is Missing);
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IConvertible ic1 = Convert.GetIConvertible(v1);
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IConvertible ic2 = Convert.GetIConvertible(v2);
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TypeCode t1 = Convert.GetTypeCode(v1, ic1);
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TypeCode t2 = Convert.GetTypeCode(v2, ic2);
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switch(t1){
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case TypeCode.Empty:
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case TypeCode.DBNull:
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break;
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case TypeCode.Object:
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switch(t2){
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case TypeCode.Empty:
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case TypeCode.DBNull:
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break;
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default:
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MethodInfo oper = this.GetOperator(v1.GetType(), v2.GetType());
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if (oper != null){
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bool result = (bool)oper.Invoke(null, (BindingFlags)0, JSBinder.ob, new Object[]{v1, v2}, null);
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if (this.operatorTok == JSToken.NotEqual) return !result;
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return result;
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}
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break;
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}
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break;
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default:
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switch(t2){
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case TypeCode.Object:
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MethodInfo oper = this.GetOperator(v1.GetType(), v2.GetType());
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if (oper != null){
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bool result = (bool)oper.Invoke(null, (BindingFlags)0, JSBinder.ob, new Object[]{v1, v2}, null);
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if (this.operatorTok == JSToken.NotEqual) return !result;
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return result;
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}
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break;
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}
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break;
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}
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return Equality.JScriptEquals(v1, v2, ic1, ic2, t1, t2, checkForDebuggerObjects);
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}
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public static bool JScriptEquals(Object v1, Object v2){
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if (v1 is String && v2 is String) return v1.Equals(v2);
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if (v1 is Int32 && v2 is Int32) return ((int)v1) == (int)v2;
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if (v1 is Double && v2 is Double) return ((double)v1) == (double)v2;
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if ((v2 == null || v2 is DBNull || v2 is Missing)) return (v1 == null || v1 is DBNull || v1 is Missing);
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IConvertible ic1 = Convert.GetIConvertible(v1);
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IConvertible ic2 = Convert.GetIConvertible(v2);
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TypeCode t1 = Convert.GetTypeCode(v1, ic1);
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TypeCode t2 = Convert.GetTypeCode(v2, ic2);
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return Equality.JScriptEquals(v1, v2, ic1, ic2, t1, t2, false);
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}
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private static bool JScriptEquals(Object v1, Object v2, IConvertible ic1, IConvertible ic2, TypeCode t1, TypeCode t2, bool checkForDebuggerObjects){
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if (StrictEquality.JScriptStrictEquals(v1, v2, ic1, ic2, t1, t2, checkForDebuggerObjects))
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return true;
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if (t2 == TypeCode.Boolean){
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v2 = ic2.ToBoolean(null) ? 1 : 0;
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ic2 = Convert.GetIConvertible(v2);
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return Equality.JScriptEquals(v1, v2, ic1, ic2, t1, TypeCode.Int32, false);
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}
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switch (t1){
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case TypeCode.Empty: return t2 == TypeCode.Empty || t2 == TypeCode.DBNull || (t2 == TypeCode.Object && v2 is Missing);
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case TypeCode.Object:
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switch (t2){
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case TypeCode.Empty:
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case TypeCode.DBNull:
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return v1 is Missing;
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case TypeCode.Char:
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case TypeCode.SByte:
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case TypeCode.Byte:
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case TypeCode.Int16:
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case TypeCode.UInt16:
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case TypeCode.Int32:
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case TypeCode.UInt32:
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case TypeCode.Int64:
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case TypeCode.UInt64:
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case TypeCode.Single:
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case TypeCode.Double:
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case TypeCode.Decimal:
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case TypeCode.String:
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IConvertible pvic1 = ic1;
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Object pv1 = Convert.ToPrimitive(v1, PreferredType.Either, ref pvic1);
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if (pvic1 != null && pv1 != v1)
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return Equality.JScriptEquals(pv1, v2, pvic1, ic2, pvic1.GetTypeCode(), t2, false);
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else
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return false;
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}
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return false;
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case TypeCode.DBNull: return t2 == TypeCode.DBNull || t2 == TypeCode.Empty || (t2 == TypeCode.Object && v2 is Missing);
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case TypeCode.Boolean:
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v1 = ic1.ToBoolean(null) ? 1 : 0;
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ic1 = Convert.GetIConvertible(v1);
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return Equality.JScriptEquals(v1, v2, ic1, ic2, TypeCode.Int32, t2, false);
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case TypeCode.Char:
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case TypeCode.SByte:
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case TypeCode.Byte:
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case TypeCode.Int16:
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case TypeCode.UInt16:
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case TypeCode.Int32:
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case TypeCode.UInt32:
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case TypeCode.Int64:
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case TypeCode.UInt64:
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case TypeCode.Single:
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case TypeCode.Double:
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case TypeCode.Decimal:
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if (t2 == TypeCode.Object){
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IConvertible pvic2 = ic2;
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Object pv2 = Convert.ToPrimitive(v2, PreferredType.Either, ref pvic2);
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if (pvic2 != null && pv2 != v2)
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return Equality.JScriptEquals(v1, pv2, ic1, pvic2, t1, pvic2.GetTypeCode(), false);
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else
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return false;
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}
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if (t2 == TypeCode.String){
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if (v1 is Enum) return Convert.ToString(v1).Equals(ic2.ToString(null));
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v2 = Convert.ToNumber(v2, ic2);
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ic2 = Convert.GetIConvertible(v2);
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return StrictEquality.JScriptStrictEquals(v1, v2, ic1, ic2, t1, TypeCode.Double, false);
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}
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return false;
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case TypeCode.DateTime:
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if (t2 == TypeCode.Object){
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IConvertible pvic2 = ic2;
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Object pv2 = Convert.ToPrimitive(v2, PreferredType.Either, ref pvic2);
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if (pv2 != null && pv2 != v2)
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return StrictEquality.JScriptStrictEquals(v1, pv2, ic1, pvic2, t1, pvic2.GetTypeCode(), false);
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}
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return false;
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case TypeCode.String:
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switch (t2){
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case TypeCode.Object:{
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IConvertible pvic2 = ic2;
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Object pv2 = Convert.ToPrimitive(v2, PreferredType.Either, ref pvic2);
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if (pvic2 != null && pv2 != v2)
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return Equality.JScriptEquals(v1, pv2, ic1, pvic2, t1, pvic2.GetTypeCode(), false);
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else
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return false;
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}
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case TypeCode.SByte:
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case TypeCode.Byte:
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case TypeCode.Int16:
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case TypeCode.UInt16:
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case TypeCode.Int32:
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case TypeCode.UInt32:
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case TypeCode.Int64:
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case TypeCode.UInt64:
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case TypeCode.Single:
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case TypeCode.Double:
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case TypeCode.Decimal:
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if (v2 is Enum) return Convert.ToString(v2).Equals(ic1.ToString(null));
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v1 = Convert.ToNumber(v1, ic1);
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ic1 = Convert.GetIConvertible(v1);
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return StrictEquality.JScriptStrictEquals(v1, v2, ic1, ic2, TypeCode.Double, t2, false);
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}
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return false;
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}
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return false;
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}
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internal override IReflect InferType(JSField inference_target){
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return Typeob.Boolean;
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}
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internal override void TranslateToConditionalBranch(ILGenerator il, bool branchIfTrue, Label label, bool shortForm){
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if (this.metaData == null){
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Type t1 = this.type1;
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Type t2 = this.type2;
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Type t3 = Typeob.Object;
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bool emitNullAndUndefined = true;
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if (t1.IsPrimitive && t2.IsPrimitive){
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t3 = Typeob.Double;
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if (t1 == Typeob.Single || t2 == Typeob.Single)
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t3 = Typeob.Single;
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else if (Convert.IsPromotableTo(t1, t2))
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t3 = t2;
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else if (Convert.IsPromotableTo(t2, t1))
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t3 = t1;
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}else if (t1 == Typeob.String && (t2 == Typeob.String || t2 == Typeob.Empty || t2 == Typeob.Null)){
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t3 = Typeob.String;
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if (t2 != Typeob.String){
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emitNullAndUndefined = false;
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branchIfTrue = !branchIfTrue;
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}
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}else if ((t1 == Typeob.Empty || t1 == Typeob.Null) && t2 == Typeob.String){
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t3 = Typeob.String;
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emitNullAndUndefined = false;
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branchIfTrue = !branchIfTrue;
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}
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if (t3 == Typeob.SByte || t3 == Typeob.Int16)
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t3 = Typeob.Int32;
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else if (t3 == Typeob.Byte || t3 == Typeob.UInt16)
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t3 = Typeob.UInt32;
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if (emitNullAndUndefined){
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this.operand1.TranslateToIL(il, t3);
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this.operand2.TranslateToIL(il, t3);
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if (t3 == Typeob.Object)
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il.Emit(OpCodes.Call, CompilerGlobals.jScriptEqualsMethod);
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else if (t3 == Typeob.String)
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il.Emit(OpCodes.Call, CompilerGlobals.stringEqualsMethod);
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}else if (t1 == Typeob.String)
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this.operand1.TranslateToIL(il, t3);
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else if (t2 == Typeob.String)
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this.operand2.TranslateToIL(il, t3);
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if (branchIfTrue){
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if (this.operatorTok == JSToken.Equal)
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if (t3 == Typeob.String || t3 == Typeob.Object)
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il.Emit(shortForm ? OpCodes.Brtrue_S : OpCodes.Brtrue, label);
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else
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il.Emit(shortForm ? OpCodes.Beq_S : OpCodes.Beq, label);
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else
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if (t3 == Typeob.String || t3 == Typeob.Object)
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il.Emit(shortForm ? OpCodes.Brfalse_S : OpCodes.Brfalse, label);
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else
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il.Emit(shortForm ? OpCodes.Bne_Un_S : OpCodes.Bne_Un, label);
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}else{
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if (this.operatorTok == JSToken.Equal)
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if (t3 == Typeob.String || t3 == Typeob.Object)
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il.Emit(shortForm ? OpCodes.Brfalse_S : OpCodes.Brfalse, label);
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else
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il.Emit(shortForm ? OpCodes.Bne_Un_S : OpCodes.Bne_Un, label);
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else
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if (t3 == Typeob.String || t3 == Typeob.Object)
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il.Emit(shortForm ? OpCodes.Brtrue_S : OpCodes.Brtrue, label);
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else
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il.Emit(shortForm ? OpCodes.Beq_S : OpCodes.Beq, label);
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}
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return;
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}
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if (this.metaData is MethodInfo){
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MethodInfo oper = (MethodInfo)this.metaData;
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ParameterInfo[] pars = oper.GetParameters();
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this.operand1.TranslateToIL(il, pars[0].ParameterType);
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this.operand2.TranslateToIL(il, pars[1].ParameterType);
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il.Emit(OpCodes.Call, oper);
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if (branchIfTrue)
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il.Emit(shortForm ? OpCodes.Brtrue_S : OpCodes.Brtrue, label);
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else
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il.Emit(shortForm ? OpCodes.Brfalse_S : OpCodes.Brfalse, label);
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return;
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}
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//Getting here is just too bad. We do not know until the code runs whether or not to call an overloaded operator method.
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//Compile operands to objects and devolve the decision making to run time thunks
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il.Emit(OpCodes.Ldloc, (LocalBuilder)this.metaData);
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this.operand1.TranslateToIL(il, Typeob.Object);
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this.operand2.TranslateToIL(il, Typeob.Object);
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il.Emit(OpCodes.Call, CompilerGlobals.evaluateEqualityMethod);
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if (branchIfTrue){
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if (this.operatorTok == JSToken.Equal)
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il.Emit(shortForm ? OpCodes.Brtrue_S : OpCodes.Brtrue, label);
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else
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il.Emit(shortForm ? OpCodes.Brfalse_S : OpCodes.Brfalse, label);
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}else{
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if (this.operatorTok == JSToken.Equal)
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il.Emit(shortForm ? OpCodes.Brfalse_S : OpCodes.Brfalse, label);
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else
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il.Emit(shortForm ? OpCodes.Brtrue_S : OpCodes.Brtrue, label);
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}
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return;
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}
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internal override void TranslateToIL(ILGenerator il, Type rtype){
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Label true_label = il.DefineLabel();
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Label done_label = il.DefineLabel();
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this.TranslateToConditionalBranch(il, true, true_label, true);
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il.Emit(OpCodes.Ldc_I4_0);
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il.Emit(OpCodes.Br_S, done_label);
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il.MarkLabel(true_label);
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il.Emit(OpCodes.Ldc_I4_1);
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il.MarkLabel(done_label);
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Convert.Emit(this, il, Typeob.Boolean, rtype);
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}
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internal override void TranslateToILInitializer(ILGenerator il){
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this.operand1.TranslateToILInitializer(il);
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this.operand2.TranslateToILInitializer(il);
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MethodInfo oper = this.GetOperator(this.operand1.InferType(null), this.operand2.InferType(null));
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if (oper != null){
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this.metaData = oper;
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return;
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}
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if (this.operand1 is ConstantWrapper){
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Object val = this.operand1.Evaluate();
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if (val == null) this.type1 = Typeob.Empty;
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else if (val is DBNull) this.type1 = Typeob.Null;
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}
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if (this.operand2 is ConstantWrapper){
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Object val = this.operand2.Evaluate();
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if (val == null) this.type2 = Typeob.Empty;
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else if (val is DBNull) this.type2 = Typeob.Null;
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}
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if (this.type1 == Typeob.Empty || this.type1 == Typeob.Null || this.type2 == Typeob.Empty || this.type2 == Typeob.Null) return;
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if ((this.type1.IsPrimitive || this.type1 == Typeob.String || Typeob.JSObject.IsAssignableFrom(this.type1))
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&& (this.type2.IsPrimitive || this.type2 == Typeob.String || Typeob.JSObject.IsAssignableFrom(this.type2)))
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return;
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this.metaData = il.DeclareLocal(typeof(Equality));
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ConstantWrapper.TranslateToILInt(il, (int)this.operatorTok);
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il.Emit(OpCodes.Newobj, CompilerGlobals.equalityConstructor);
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il.Emit(OpCodes.Stloc, (LocalBuilder)this.metaData);
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}
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}
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}
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