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using NUnit.Framework;
using System;
using Microsoft.Boogie;
using System.Collections.Generic;
namespace CoreTests
{
[TestFixture()]
public class ExprImmutability : IErrorSink
{
public void Error(IToken tok, string msg)
{
Assert.Fail(msg);
}
// Cached hashcode checkers
[Test()]
public void CachedHashCodeLiteralExpr()
{
var literal = new LiteralExpr(Token.NoToken, true, /*immutable=*/true);
Assert.AreEqual(literal.ComputeHashCode(), literal.GetHashCode());
var literal2 = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(0), /*immutable=*/true);
Assert.AreEqual(literal2.ComputeHashCode(), literal2.GetHashCode());
var literal3 = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigDec.FromInt(0), /*immutable=*/true);
Assert.AreEqual(literal3.ComputeHashCode(), literal3.GetHashCode());
var literal4 = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(0), 8, /*immutable=*/true);
Assert.AreEqual(literal4.ComputeHashCode(), literal4.GetHashCode());
}
[Test()]
public void CachedHashCodeIdentifierExpr()
{
var id = new IdentifierExpr(Token.NoToken, "foo", BasicType.Bool, /*immutable=*/true);
Assert.AreEqual(id.ComputeHashCode(), id.GetHashCode());
var variable = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "foo2", BasicType.Int));
var id2 = new IdentifierExpr(Token.NoToken, variable, /*immutable=*/true);
Assert.AreEqual(id2.ComputeHashCode(), id2.GetHashCode());
}
[Test()]
public void CachedHashCodeNAryExpr()
{
var nary = new NAryExpr(Token.NoToken, new UnaryOperator(Token.NoToken, UnaryOperator.Opcode.Not), new List<Expr>() { Expr.True }, /*immutable=*/true);
Assert.AreEqual(nary.ComputeHashCode(), nary.GetHashCode());
}
[Test()]
public void CachedHashCodeBvExtractExpr()
{
var literalBv = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(0), 4, /*immutable=*/true);
var bvExtract = new BvExtractExpr(Token.NoToken, literalBv, 3, 0, /*immutable=*/true);
Assert.AreEqual(bvExtract.ComputeHashCode(), bvExtract.GetHashCode());
}
[Test()]
public void CachedHashCodeBvConcatExpr()
{
var literalBv = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(0), 4, /*immutable=*/true);
var bvConcat = new BvConcatExpr(Token.NoToken, literalBv, literalBv, /*immutable=*/true);
Assert.AreEqual(bvConcat.ComputeHashCode(), bvConcat.GetHashCode());
}
[Test()]
public void CachedHashCodeOldExpr()
{
var literalBv = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(0), 4, /*immutable=*/true);
var oldExpr = new OldExpr(Token.NoToken, literalBv, /*immutable=*/true);
Assert.AreEqual(oldExpr.ComputeHashCode(), oldExpr.GetHashCode());
}
[Test()]
public void CachedHashCodeForAllExpr()
{
var x = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var y = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var body = Expr.Gt (new IdentifierExpr (Token.NoToken, x, /*immutable=*/true),
new IdentifierExpr(Token.NoToken, y, /*immutable=*/true));
var forAll = new ForallExpr(Token.NoToken, new List<Variable> () {x, y }, body, /*immutable=*/ true);
Assert.AreEqual(forAll.ComputeHashCode(), forAll.GetHashCode());
}
[Test()]
public void CachedHashCodeExistsExpr()
{
var x = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var y = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var body = Expr.Gt (new IdentifierExpr (Token.NoToken, x, /*immutable=*/true),
new IdentifierExpr(Token.NoToken, y, /*immutable=*/true));
var exists = new ExistsExpr(Token.NoToken, new List<Variable> () {x, y }, body, /*immutable=*/ true);
Assert.AreEqual(exists.ComputeHashCode(), exists.GetHashCode());
}
[Test()]
public void CachedHashCodeLambdaExpr()
{
var x = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var y = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var body = Expr.Gt (new IdentifierExpr (Token.NoToken, x, /*immutable=*/true),
new IdentifierExpr(Token.NoToken, y, /*immutable=*/true));
var lambda = new LambdaExpr(Token.NoToken, new List<TypeVariable>(), new List<Variable>() { x, y},
null, body, /*immutable=*/true);
Assert.AreEqual(lambda.ComputeHashCode(), lambda.GetHashCode());
}
// Runtime immutability enforcement
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void IdentifierExprName()
{
var id = new IdentifierExpr(Token.NoToken, "foo", BasicType.Bool, /*immutable=*/true);
Assert.IsTrue(id.Immutable);
id.Name = "foo2";
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void IdentifierExprDecl()
{
var id = new IdentifierExpr(Token.NoToken, "foo", BasicType.Bool, /*immutable=*/true);
Assert.IsTrue(id.Immutable);
var typedIdent = new TypedIdent(Token.NoToken, "foo2", BasicType.Bool);
id.Decl = new GlobalVariable(Token.NoToken, typedIdent);
}
private NAryExpr GetUnTypedImmutableNAry()
{
var id = new IdentifierExpr(Token.NoToken, "foo", BasicType.Bool, /*immutable=*/true);
Assert.IsTrue(id.Immutable);
Assert.IsTrue(id.Type.IsBool);
var e = new NAryExpr(Token.NoToken, new BinaryOperator(Token.NoToken, BinaryOperator.Opcode.And), new List<Expr>() {
id,
id
}, /*immutable=*/true);
Assert.IsNull(e.Type);
Assert.IsTrue(e.Immutable);
return e;
}
[Test()]
public void ProtectedExprType()
{
var e = GetUnTypedImmutableNAry();
// Now Typecheck
// Even though it's immutable we allow the TypeCheck field to be set if the Expr has never been type checked
var TC = new TypecheckingContext(this);
e.Typecheck(TC);
Assert.IsNotNull(e.Type);
Assert.IsTrue(e.Type.IsBool);
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedExprChangeTypeFail()
{
var e = GetUnTypedImmutableNAry();
// Now Typecheck
// Even though it's immutable we allow the TypeCheck field to be set if the Expr has never been type checked
var TC = new TypecheckingContext(this);
e.Typecheck(TC);
Assert.IsNotNull(e.Type);
Assert.IsTrue(e.Type.IsBool);
// Trying to modify the Type to a different Type now should fail
e.Type = BasicType.Int;
}
[Test()]
public void ProtectedExprTypeChangeTypeSucceed()
{
var e = GetUnTypedImmutableNAry();
// Now Typecheck
// Even though it's immutable we allow the TypeCheck field to be set if the Expr has never been type checked
var TC = new TypecheckingContext(this);
e.Typecheck(TC);
Assert.IsNotNull(e.Type);
Assert.IsTrue(e.Type.IsBool);
// Trying to assign the same Type should succeed
e.Type = BasicType.Bool;
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedOldExpr()
{
var e = new OldExpr(Token.NoToken, Expr.True, /*immutable=*/ true);
e.Expr = Expr.False;
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedNAryFunc()
{
var e = GetUnTypedImmutableNAry();
e.Fun = new BinaryOperator(Token.NoToken, BinaryOperator.Opcode.Sub);
}
[Test(), ExpectedException(typeof(NotSupportedException))]
public void ProtectedNAryArgsList()
{
var e = GetUnTypedImmutableNAry();
e.Args.Add(null);
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedNAryArgs()
{
var e = GetUnTypedImmutableNAry();
e.Args = new List<Expr>();
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedForAllExprBody()
{
var x = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var y = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var xId = new IdentifierExpr(Token.NoToken, x, /*immutable=*/true);
var yId = new IdentifierExpr(Token.NoToken, y, /*immutable=*/true);
var body = Expr.Gt(xId, yId);
var forAll = new ForallExpr(Token.NoToken, new List<Variable> () { x, y }, body, /*immutable=*/true);
forAll.Body = Expr.Lt(xId, yId); // Changing the body of an immutable ForAllExpr should fail
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedExistsExprBody()
{
var x = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var y = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var xId = new IdentifierExpr(Token.NoToken, x, /*immutable=*/true);
var yId = new IdentifierExpr(Token.NoToken, y, /*immutable=*/true);
var body = Expr.Gt(xId, yId);
var exists = new ExistsExpr(Token.NoToken, new List<Variable> () { x, y }, body, /*immutable=*/true);
exists.Body = Expr.Lt(xId, yId); // Changing the body of an immutable ExistsExpr should fail
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedLambdaExprBody()
{
var x = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var y = new BoundVariable(Token.NoToken, new TypedIdent(Token.NoToken, "x", BasicType.Int));
var xId = new IdentifierExpr(Token.NoToken, x, /*immutable=*/true);
var yId = new IdentifierExpr(Token.NoToken, y, /*immutable=*/true);
var body = Expr.Gt(xId, yId);
var lambda = new LambdaExpr(Token.NoToken, new List<TypeVariable>(), new List<Variable>() { x, y},
null, body, /*immutable=*/true);
lambda.Body = Expr.Lt(xId, yId); // Changing the body of an immutable ExistsExpr should fail
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedBvConcatExprLhs()
{
var lhs = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(0), 32, /*immutable=*/true);
var rhs = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(1), 32, /*immutable=*/true);
var concat = new BvConcatExpr(Token.NoToken, lhs, rhs,/* immutable=*/true);
Assert.IsTrue(concat.Immutable);
concat.E0 = rhs; // Should throw
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedBvConcatExprRhs()
{
var lhs = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(0), 32, /*immutable=*/true);
var rhs = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(1), 32, /*immutable=*/true);
var concat = new BvConcatExpr(Token.NoToken, lhs, rhs,/* immutable=*/true);
Assert.IsTrue(concat.Immutable);
concat.E1 = lhs; // Should throw
}
[Test(), ExpectedException(typeof(InvalidOperationException))]
public void ProtectedBvExtract()
{
var bv = new LiteralExpr(Token.NoToken, Microsoft.Basetypes.BigNum.FromInt(0), 32, /*immutable=*/true);
var extract = new BvExtractExpr(Token.NoToken, bv, 32, 0, /*immutable=*/true);
Assert.IsTrue(extract.Immutable);
extract.Bitvector = bv; // Should throw
}
}
}
|
