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// Copyright (c) 2010-2013 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.IO;
using System.Linq;
using System.Threading;
using ICSharpCode.NRefactory.CSharp.Resolver;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.TypeSystem.Implementation;
using NUnit.Framework;
namespace ICSharpCode.NRefactory.CSharp.Analysis
{
[TestFixture]
public class DefiniteAssignmentTests
{
DefiniteAssignmentAnalysis CreateDefiniteAssignmentAnalysis(Statement rootStatement)
{
var resolver = new CSharpAstResolver(new CSharpResolver(new SimpleCompilation(CecilLoaderTests.Mscorlib)), rootStatement);
return new DefiniteAssignmentAnalysis(rootStatement, resolver, CancellationToken.None);
}
[Test]
public void TryFinally()
{
BlockStatement block = new BlockStatement {
new TryCatchStatement {
TryBlock = new BlockStatement {
new GotoStatement("LABEL"),
new AssignmentExpression(new IdentifierExpression("i"), new PrimitiveExpression(1))
},
CatchClauses = {
new CatchClause {
Body = new BlockStatement {
new AssignmentExpression(new IdentifierExpression("i"), new PrimitiveExpression(3))
}
}
},
FinallyBlock = new BlockStatement {
new AssignmentExpression(new IdentifierExpression("j"), new PrimitiveExpression(5))
}
},
new LabelStatement { Label = "LABEL" },
new EmptyStatement()
};
TryCatchStatement tryCatchStatement = (TryCatchStatement)block.Statements.First();
Statement stmt1 = tryCatchStatement.TryBlock.Statements.ElementAt(1);
Statement stmt3 = tryCatchStatement.CatchClauses.Single().Body.Statements.Single();
Statement stmt5 = tryCatchStatement.FinallyBlock.Statements.Single();
LabelStatement label = (LabelStatement)block.Statements.ElementAt(1);
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(block);
da.Analyze("i");
Assert.AreEqual(0, da.UnassignedVariableUses.Count);
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(tryCatchStatement));
Assert.AreEqual(DefiniteAssignmentStatus.CodeUnreachable, da.GetStatusBefore(stmt1));
Assert.AreEqual(DefiniteAssignmentStatus.CodeUnreachable, da.GetStatusAfter(stmt1));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(stmt3));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(stmt3));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(stmt5));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusAfter(stmt5));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(tryCatchStatement));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBefore(label));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusAfter(label));
da.Analyze("j");
Assert.AreEqual(0, da.UnassignedVariableUses.Count);
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(tryCatchStatement));
Assert.AreEqual(DefiniteAssignmentStatus.CodeUnreachable, da.GetStatusBefore(stmt1));
Assert.AreEqual(DefiniteAssignmentStatus.CodeUnreachable, da.GetStatusAfter(stmt1));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(stmt3));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusAfter(stmt3));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(stmt5));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(stmt5));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(tryCatchStatement));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBefore(label));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(label));
}
[Test]
public void ConditionalAnd()
{
IfElseStatement ifStmt = new IfElseStatement {
Condition = new BinaryOperatorExpression {
Left = new BinaryOperatorExpression(new IdentifierExpression("x"), BinaryOperatorType.GreaterThan, new PrimitiveExpression(0)),
Operator = BinaryOperatorType.ConditionalAnd,
Right = new BinaryOperatorExpression {
Left = new ParenthesizedExpression {
Expression = new AssignmentExpression {
Left = new IdentifierExpression("i"),
Operator = AssignmentOperatorType.Assign,
Right = new IdentifierExpression("y")
}
},
Operator = BinaryOperatorType.GreaterThanOrEqual,
Right = new PrimitiveExpression(0)
}
},
TrueStatement = new BlockStatement(),
FalseStatement = new BlockStatement()
};
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(ifStmt);
da.Analyze("i");
Assert.AreEqual(0, da.UnassignedVariableUses.Count);
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(ifStmt));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBefore(ifStmt.TrueStatement));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(ifStmt.FalseStatement));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusAfter(ifStmt));
}
[Test]
public void ConditionalOr()
{
IfElseStatement ifStmt = new IfElseStatement {
Condition = new BinaryOperatorExpression {
Left = new BinaryOperatorExpression(new IdentifierExpression("x"), BinaryOperatorType.GreaterThan, new PrimitiveExpression(0)),
Operator = BinaryOperatorType.ConditionalOr,
Right = new BinaryOperatorExpression {
Left = new ParenthesizedExpression {
Expression = new AssignmentExpression {
Left = new IdentifierExpression("i"),
Operator = AssignmentOperatorType.Assign,
Right = new IdentifierExpression("y")
}
},
Operator = BinaryOperatorType.GreaterThanOrEqual,
Right = new PrimitiveExpression(0)
}
},
TrueStatement = new BlockStatement(),
FalseStatement = new BlockStatement()
};
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(ifStmt);
da.Analyze("i");
Assert.AreEqual(0, da.UnassignedVariableUses.Count);
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(ifStmt));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(ifStmt.TrueStatement));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBefore(ifStmt.FalseStatement));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusAfter(ifStmt));
}
[Test]
public void WhileTrue()
{
WhileStatement loop = new WhileStatement {
Condition = new PrimitiveExpression(true),
EmbeddedStatement = new BlockStatement {
new AssignmentExpression(new IdentifierExpression("i"), new PrimitiveExpression(0)),
new BreakStatement()
}
};
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(loop);
da.Analyze("i");
Assert.AreEqual(0, da.UnassignedVariableUses.Count);
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(loop));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(loop.EmbeddedStatement));
Assert.AreEqual(DefiniteAssignmentStatus.CodeUnreachable, da.GetStatusAfter(loop.EmbeddedStatement));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(loop));
}
[Test]
public void ForLoop()
{
ForStatement loop = new ForStatement {
Initializers = {
new ExpressionStatement(
new AssignmentExpression(new IdentifierExpression("i"), new PrimitiveExpression(0))
)
},
Condition = new BinaryOperatorExpression(new IdentifierExpression("i"), BinaryOperatorType.LessThan, new PrimitiveExpression(1000)),
Iterators = {
new ExpressionStatement(
new AssignmentExpression {
Left = new IdentifierExpression("i"),
Operator = AssignmentOperatorType.Add,
Right = new IdentifierExpression("j")
}
)
},
EmbeddedStatement = new ExpressionStatement(
new AssignmentExpression(new IdentifierExpression("j"), new IdentifierExpression("i"))
)};
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(loop);
da.Analyze("i");
Assert.AreEqual(0, da.UnassignedVariableUses.Count);
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(loop));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(loop.Initializers.Single()));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(loop.Initializers.Single()));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBeforeLoopCondition(loop));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBefore(loop.EmbeddedStatement));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(loop.EmbeddedStatement));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBefore(loop.Iterators.Single()));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(loop.Iterators.Single()));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(loop));
da.Analyze("j");
Assert.AreEqual(0, da.UnassignedVariableUses.Count);
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(loop));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(loop.Initializers.Single()));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusAfter(loop.Initializers.Single()));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBeforeLoopCondition(loop));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(loop.EmbeddedStatement));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(loop.EmbeddedStatement));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBefore(loop.Iterators.Single()));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(loop.Iterators.Single()));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusAfter(loop));
}
[Test]
public void SwitchWithGotoDefault()
{
SwitchStatement @switch = new SwitchStatement {
SwitchSections = {
new SwitchSection { // case 0:
CaseLabels = { new CaseLabel(new PrimitiveExpression(0)) },
Statements = { new GotoDefaultStatement() }
},
new SwitchSection { // default:
CaseLabels = { new CaseLabel() },
Statements = {
new ExpressionStatement(new AssignmentExpression(new IdentifierExpression("a"), new PrimitiveExpression(1))),
new BreakStatement()
}
}
}};
SwitchSection case0 = @switch.SwitchSections.ElementAt(0);
SwitchSection defaultSection = @switch.SwitchSections.ElementAt(1);
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(@switch);
da.Analyze("a");
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(@switch));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(case0.Statements.First()));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(defaultSection.Statements.First()));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBefore(defaultSection.Statements.Last()));
Assert.AreEqual(DefiniteAssignmentStatus.CodeUnreachable, da.GetStatusAfter(defaultSection.Statements.Last()));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(@switch));
}
[Test]
public void SwitchWithGotoCase()
{
SwitchStatement @switch = new SwitchStatement {
Expression = new PrimitiveExpression(1),
SwitchSections = {
new SwitchSection { // case 0:
CaseLabels = { new CaseLabel(new PrimitiveExpression(0)) },
Statements = { new BreakStatement() }
},
new SwitchSection { // case 1:
CaseLabels = { new CaseLabel(new PrimitiveExpression(1)) },
Statements = {
new ExpressionStatement(new AssignmentExpression(new IdentifierExpression("a"), new PrimitiveExpression(0))),
new GotoCaseStatement { LabelExpression = new PrimitiveExpression(2) }
}
},
new SwitchSection { // case 2:
CaseLabels = { new CaseLabel(new PrimitiveExpression(2)) },
Statements = { new BreakStatement() }
}
}};
SwitchSection case0 = @switch.SwitchSections.ElementAt(0);
SwitchSection case1 = @switch.SwitchSections.ElementAt(1);
SwitchSection case2 = @switch.SwitchSections.ElementAt(2);
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(@switch);
da.Analyze("a");
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(@switch));
Assert.AreEqual(DefiniteAssignmentStatus.CodeUnreachable, da.GetStatusBefore(case0.Statements.First()));
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusBefore(case1.Statements.First()));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusBefore(case2.Statements.First()));
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(@switch));
}
[Test]
public void ConditionalExpression1()
{
string code = "int a; int b = X ? (a = 1) : 0;";
var block = new BlockStatement();
block.Statements.AddRange(new CSharpParser().ParseStatements(code));
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(block);
da.Analyze("a");
Assert.AreEqual(DefiniteAssignmentStatus.PotentiallyAssigned, da.GetStatusAfter(block));
}
[Test]
public void ConditionalExpression2()
{
string code = "int a; int b = X ? (a = 1) : (a = 2);";
var block = new BlockStatement();
block.Statements.AddRange(new CSharpParser().ParseStatements(code));
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(block);
da.Analyze("a");
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(block));
}
[Test]
public void ConditionalExpression3()
{
string code = "int a; int b = true ? (a = 1) : 0;";
var block = new BlockStatement();
block.Statements.AddRange(new CSharpParser().ParseStatements(code));
DefiniteAssignmentAnalysis da = CreateDefiniteAssignmentAnalysis(block);
da.Analyze("a");
Assert.AreEqual(DefiniteAssignmentStatus.DefinitelyAssigned, da.GetStatusAfter(block));
}
}
}
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