private Statement ParseUnaryConditionalBranch(IOperation currentOperation)
{
Expression condition = this.PopOperandStack();
var castIfPossible = condition as CastIfPossible;
if (castIfPossible != null) {
condition = new CheckIfInstance() {
Locations = castIfPossible.Locations,
Operand = castIfPossible.ValueToCast,
TypeToCheck = castIfPossible.TargetType,
};
} else if (condition.Type != Dummy.TypeReference && condition.Type.TypeCode != PrimitiveTypeCode.Boolean) {
var defaultValue = new DefaultValue() { DefaultValueType = condition.Type, Type = condition.Type };
condition = new NotEquality() { LeftOperand = condition, RightOperand = defaultValue };
}
condition.Type = this.platformType.SystemBoolean;
GotoStatement gotoStatement = MakeGoto(currentOperation);
ConditionalStatement ifStatement = new ConditionalStatement();
ifStatement.Condition = condition;
switch (currentOperation.OperationCode) {
case OperationCode.Brfalse:
case OperationCode.Brfalse_S:
ifStatement.TrueBranch = new EmptyStatement();
ifStatement.FalseBranch = gotoStatement;
break;
case OperationCode.Brtrue:
case OperationCode.Brtrue_S:
default:
ifStatement.TrueBranch = gotoStatement;
ifStatement.FalseBranch = new EmptyStatement();
break;
}
return ifStatement;
}
/// <summary>
/// Visits the specified default value.
/// </summary>
/// <param name="defaultValue">The default value.</param>
public override void Visit(IDefaultValue defaultValue)
{
DefaultValue mutableDefaultValue = new DefaultValue(defaultValue);
this.resultExpression = this.myCodeCopier.DeepCopy(mutableDefaultValue);
}
/// <summary>
/// Visits the specified default value.
/// </summary>
/// <param name="defaultValue">The default value.</param>
/// <returns></returns>
protected virtual IExpression DeepCopy(DefaultValue defaultValue)
{
defaultValue.DefaultValueType = Substitute(defaultValue.DefaultValueType);
defaultValue.Type = this.Substitute(defaultValue.Type);
return defaultValue;
}
private static IExpression ConvertToBoolean(IExpression expression) {
Contract.Requires(expression != null);
Contract.Ensures(Contract.Result<IExpression>() != null);
IPlatformType platformType = expression.Type.PlatformType;
var cc = expression as CompileTimeConstant;
if (cc != null && TypeHelper.IsPrimitiveInteger(cc.Type)) {
cc.Value = !ExpressionHelper.IsIntegralZero(cc);
cc.Type = platformType.SystemBoolean;
return cc;
}
var conditional = expression as Conditional;
if (conditional != null) {
conditional.ResultIfTrue = ConvertToBoolean(conditional.ResultIfTrue);
conditional.ResultIfFalse = ConvertToBoolean(conditional.ResultIfFalse);
conditional.Type = platformType.SystemBoolean;
return conditional;
}
object/*?*/ val = null;
ITypeReference type = platformType.SystemObject;
ITypeReference expressionType = expression.Type;
IExpression rightOperand = null; // zero or null, but has to be type-specific
switch (expressionType.TypeCode) {
case PrimitiveTypeCode.Boolean: {
var addrDeref = expression as AddressDereference;
Conversion conversion;
IManagedPointerTypeReference mgdPtr;
if (addrDeref != null && (conversion = addrDeref.Address as Conversion) != null &&
(mgdPtr = conversion.ValueToConvert.Type as IManagedPointerTypeReference) != null) {
expressionType = mgdPtr.TargetType;
addrDeref.Address = conversion.ValueToConvert;
addrDeref.Type = expressionType;
expression = addrDeref;
goto default;
}
return expression;
}
case PrimitiveTypeCode.Char: val = (char)0; type = platformType.SystemChar; break;
case PrimitiveTypeCode.Float32: val = (float)0; type = platformType.SystemFloat32; break;
case PrimitiveTypeCode.Float64: val = (double)0; type = platformType.SystemFloat64; break;
case PrimitiveTypeCode.Int16: val = (short)0; type = platformType.SystemInt16; break;
case PrimitiveTypeCode.Int32: val = (int)0; type = platformType.SystemInt32; break;
case PrimitiveTypeCode.Int64: val = (long)0; type = platformType.SystemInt64; break;
case PrimitiveTypeCode.Int8: val = (sbyte)0; type = platformType.SystemInt8; break;
case PrimitiveTypeCode.IntPtr: val = IntPtr.Zero; type = platformType.SystemIntPtr; break;
case PrimitiveTypeCode.UInt16: val = (ushort)0; type = platformType.SystemUInt16; break;
case PrimitiveTypeCode.UInt32: val = (uint)0; type = platformType.SystemUInt32; break;
case PrimitiveTypeCode.UInt64: val = (ulong)0; type = platformType.SystemUInt64; break;
case PrimitiveTypeCode.UInt8: val = (byte)0; type = platformType.SystemUInt8; break;
case PrimitiveTypeCode.UIntPtr: val = UIntPtr.Zero; type = platformType.SystemUIntPtr; break;
default:
rightOperand = new DefaultValue() {
DefaultValueType = expressionType,
Type = expressionType,
};
break;
}
if (rightOperand == null) {
rightOperand = new CompileTimeConstant() {
Value = val,
Type = type,
};
}
NotEquality result = new NotEquality() {
LeftOperand = expression,
RightOperand = rightOperand,
Type = platformType.SystemBoolean,
};
return result;
}
/// <summary>
/// If the local declaration has an initial value, then generate the
/// statement "loc := e" from it.
/// Special case: if "loc" is a struct, then treat it as a call to
/// the default ctor.
/// Otherwise ignore it.
/// </summary>
public override void TraverseChildren(ILocalDeclarationStatement localDeclarationStatement) {
var initVal = localDeclarationStatement.InitialValue;
var typ = localDeclarationStatement.LocalVariable.Type;
var isStruct = TranslationHelper.IsStruct(typ);
if (initVal == null && !isStruct)
return;
var boogieLocal = this.sink.FindOrCreateLocalVariable(localDeclarationStatement.LocalVariable);
var boogieLocalExpr = Bpl.Expr.Ident(boogieLocal);
var tok = localDeclarationStatement.Token();
Bpl.Expr e = null;
var structCopy = isStruct && initVal != null && !(initVal is IDefaultValue);
// then a struct value of type S is being assigned: "lhs := s"
// model this as the statement "call lhs := S..#copy_ctor(s)" that does the bit-wise copying
if (isStruct) {
if (!structCopy) {
var defaultValue = new DefaultValue() {
DefaultValueType = typ,
Locations = new List<ILocation>(localDeclarationStatement.Locations),
Type = typ,
};
var e2 = ExpressionFor(defaultValue);
StmtBuilder.Add(Bpl.Cmd.SimpleAssign(tok, boogieLocalExpr, e2));
} else
/*if (structCopy) */{
var proc = this.sink.FindOrCreateProcedureForStructCopy(typ);
e = ExpressionFor(initVal);
StmtBuilder.Add(new Bpl.CallCmd(tok, proc.Name, new List<Bpl.Expr> { e, }, new List<Bpl.IdentifierExpr>{ boogieLocalExpr, }));
}
} else {
e = ExpressionFor(initVal);
StmtBuilder.Add(Bpl.Cmd.SimpleAssign(tok, boogieLocalExpr, e));
}
return;
}
/// <summary>
/// Rewrites the children of the given defalut value expression.
/// </summary>
public virtual void RewriteChildren(DefaultValue defaultValue)
{
this.RewriteChildren((Expression)defaultValue);
defaultValue.DefaultValueType = this.Rewrite(defaultValue.DefaultValueType);
}
/// <summary>
/// Visits the specified default value.
/// </summary>
/// <param name="defaultValue">The default value.</param>
/// <returns></returns>
public virtual IExpression Visit(DefaultValue defaultValue)
{
defaultValue.DefaultValueType = Visit(defaultValue.DefaultValueType);
defaultValue.Type = this.Visit(defaultValue.Type);
return defaultValue;
}
/// <summary>
/// Visits the specified default value.
/// </summary>
/// <param name="defaultValue">The default value.</param>
public override void Visit(IDefaultValue defaultValue)
{
DefaultValue mutableDefaultValue = defaultValue as DefaultValue;
if (alwaysMakeACopy || mutableDefaultValue == null) mutableDefaultValue = new DefaultValue(defaultValue);
this.resultExpression = this.myCodeMutator.Visit(mutableDefaultValue);
}