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Diffstat (limited to 'ICSharpCode.Decompiler/ILAst/SymbolicExecution.cs')
| -rw-r--r-- | ICSharpCode.Decompiler/ILAst/SymbolicExecution.cs | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/ICSharpCode.Decompiler/ILAst/SymbolicExecution.cs b/ICSharpCode.Decompiler/ILAst/SymbolicExecution.cs deleted file mode 100644 index 76c57eb0..00000000 --- a/ICSharpCode.Decompiler/ILAst/SymbolicExecution.cs +++ /dev/null @@ -1,157 +0,0 @@ -// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team -// -// Permission is hereby granted, free of charge, to any person obtaining a copy of this -// software and associated documentation files (the "Software"), to deal in the Software -// without restriction, including without limitation the rights to use, copy, modify, merge, -// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons -// to whom the Software is furnished to do so, subject to the following conditions: -// -// The above copyright notice and this permission notice shall be included in all copies or -// substantial portions of the Software. -// -// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, -// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR -// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE -// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR -// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER -// DEALINGS IN THE SOFTWARE. - -using System; -using System.Collections.Generic; -using System.Diagnostics; -using Mono.Cecil; - -namespace ICSharpCode.Decompiler.ILAst -{ - /// <summary> - /// This exception is thrown when we find something else than we expect from the C# compiler. - /// This aborts the analysis and makes the whole transform fail. - /// </summary> - internal class SymbolicAnalysisFailedException : Exception {} - - internal enum SymbolicValueType - { - /// <summary> - /// Unknown value - /// </summary> - Unknown, - /// <summary> - /// int: Constant (result of ldc.i4) - /// </summary> - IntegerConstant, - /// <summary> - /// int: State + Constant - /// </summary> - State, - /// <summary> - /// This pointer (result of ldarg.0) - /// </summary> - This, - /// <summary> - /// bool: State == Constant - /// </summary> - StateEquals, - /// <summary> - /// bool: State != Constant - /// </summary> - StateInEquals - } - - internal struct SymbolicValue - { - public readonly int Constant; - public readonly SymbolicValueType Type; - - public SymbolicValue(SymbolicValueType type, int constant = 0) - { - Type = type; - Constant = constant; - } - - public SymbolicValue AsBool() - { - if (Type == SymbolicValueType.State) { - // convert state integer to bool: - // if (state + c) = if (state + c != 0) = if (state != -c) - return new SymbolicValue(SymbolicValueType.StateInEquals, unchecked(-Constant)); - } - return this; - } - public override string ToString() - { - return string.Format("[SymbolicValue {0}: {1}]", Type, Constant); - } - } - - internal class SymbolicEvaluationContext - { - readonly FieldDefinition stateField; - readonly List<ILVariable> stateVariables = new List<ILVariable>(); - - public SymbolicEvaluationContext(FieldDefinition stateField) - { - this.stateField = stateField; - } - - public void AddStateVariable(ILVariable v) - { - if (!stateVariables.Contains(v)) - stateVariables.Add(v); - } - - SymbolicValue Failed() - { - return new SymbolicValue(SymbolicValueType.Unknown); - } - - public SymbolicValue Eval(ILExpression expr) - { - SymbolicValue left, right; - switch (expr.Code) { - case ILCode.Sub: - left = Eval(expr.Arguments[0]); - right = Eval(expr.Arguments[1]); - if (left.Type != SymbolicValueType.State && left.Type != SymbolicValueType.IntegerConstant) - return Failed(); - if (right.Type != SymbolicValueType.IntegerConstant) - return Failed(); - return new SymbolicValue(left.Type, unchecked ( left.Constant - right.Constant )); - case ILCode.Ldfld: - if (Eval(expr.Arguments[0]).Type != SymbolicValueType.This) - return Failed(); - if (CecilExtensions.ResolveWithinSameModule(expr.Operand as FieldReference) != stateField) - return Failed(); - return new SymbolicValue(SymbolicValueType.State); - case ILCode.Ldloc: - ILVariable loadedVariable = (ILVariable)expr.Operand; - if (stateVariables.Contains(loadedVariable)) - return new SymbolicValue(SymbolicValueType.State); - else if (loadedVariable.IsParameter && loadedVariable.OriginalParameter.Index < 0) - return new SymbolicValue(SymbolicValueType.This); - else - return Failed(); - case ILCode.Ldc_I4: - return new SymbolicValue(SymbolicValueType.IntegerConstant, (int)expr.Operand); - case ILCode.Ceq: - case ILCode.Cne: - left = Eval(expr.Arguments[0]); - right = Eval(expr.Arguments[1]); - if (left.Type != SymbolicValueType.State || right.Type != SymbolicValueType.IntegerConstant) - return Failed(); - // bool: (state + left.Constant == right.Constant) - // bool: (state == right.Constant - left.Constant) - return new SymbolicValue(expr.Code == ILCode.Ceq ? SymbolicValueType.StateEquals : SymbolicValueType.StateInEquals, unchecked(right.Constant - left.Constant)); - case ILCode.LogicNot: - SymbolicValue val = Eval(expr.Arguments[0]).AsBool(); - if (val.Type == SymbolicValueType.StateEquals) - return new SymbolicValue(SymbolicValueType.StateInEquals, val.Constant); - else if (val.Type == SymbolicValueType.StateInEquals) - return new SymbolicValue(SymbolicValueType.StateEquals, val.Constant); - else - return Failed(); - default: - return Failed(); - } - } - } -} |