public void ShouldConflictWithMainClassTest()
{
var mainMethod = MethodDeclaration.CreateMainMethodDeclaration(new List<IStatement>(), 0, 0);
var mainClass = ClassDeclaration.CreateMainClassDeclaration("Foo", mainMethod, 0, 0);
var otherClass = new ClassDeclaration("Foo", null, new List<Declaration>(), 2, 0);
var program = new Program(mainClass, new List<ClassDeclaration>(
new ClassDeclaration[] { otherClass }));
var errorReporter = new ErrorLogger();
var builder = new SymbolTableBuilder(program, errorReporter);
Assert.AreEqual(SymbolTableBuilder.ExitCode.FatalError, builder.BuildSymbolTable());
var errors = errorReporter.Errors;
Assert.AreEqual(errors.Count, 1);
Assert.AreEqual("Conflicting definitions for Foo.", errors[0].Content);
Assert.AreEqual(errors[0].Row, 2);
}
public static SemanticsChecker SetUpTypeAndReferenceChecker(string program, out IErrorReporter errorLog)
{
var reader = new StringReader(program);
var scanner = new MiniJavaScanner(reader);
var errors = new ErrorLogger();
var parser = new Parser(scanner, errors, true);
Program syntaxTree;
parser.TryParse(out syntaxTree);
reader.Close();
Assert.That(errors.Errors, Is.Empty);
var symbolTableBuilder = new SymbolTableBuilder(syntaxTree, errors);
Assert.That(errors.Errors, Is.Empty);
Assert.DoesNotThrow(() => symbolTableBuilder.BuildSymbolTable());
errorLog = new ErrorLogger();
return new SemanticsChecker(syntaxTree, errorLog);
}
public void ShouldConflictWithPredefinedTypesTest()
{
var mainMethod = MethodDeclaration.CreateMainMethodDeclaration(new List<IStatement>(), 0, 0);
var mainClass = ClassDeclaration.CreateMainClassDeclaration("int", mainMethod, 1, 0);
var secondClass = new ClassDeclaration("boolean", null, new List<Declaration>(), 2, 0);
var thirdClass = new ClassDeclaration("int", null, new List<Declaration>(), 3, 0);
var program = new Program(mainClass, new List<ClassDeclaration> (
new [] { secondClass, thirdClass }));
var errorReporter = new ErrorLogger();
var builder = new SymbolTableBuilder(program, errorReporter);
Assert.AreEqual(SymbolTableBuilder.ExitCode.FatalError, builder.BuildSymbolTable());
var errors = errorReporter.Errors;
Assert.AreEqual(3, errors.Count);
Assert.AreEqual("Conflicting definitions for int.", errors[0].Content);
Assert.AreEqual(1, errors[0].Row);
Assert.AreEqual("Conflicting definitions for boolean.", errors[1].Content);
Assert.AreEqual(2, errors[1].Row);
Assert.AreEqual("Conflicting definitions for int.", errors[2].Content);
Assert.AreEqual(3, errors[2].Row);
}
/* Performs semantic analysis on the program. Returns null if any of the phases
* fails. If a fatal error is encountered in one phase, analysis will not continue,
* but internal recovery is attempted within each phase of analysis.
*
* The phases are:
* 1. Building a symbol table. This checks that there are no name clashes in
* type declarations or cyclic dependencies. Cyclic dependencies are treated
* as fatal errors and will lead to type and reference checks not being run.
* If name clashes are found, the compiler will not even proceed to check
* cyclic dependencies. This is also treated as a fatal error.
* 2. Semantic checks. This phase checks first the validity of name references
* and then performs type checks on all expressions. References to possibly
* uninitialized variables are also detected.
*
* All errors are logged in the error log.
*/
private bool ConstructSymbolTableAndCheckProgram(Program abstractSyntaxTree)
{
var symbolTableSuccess = new SymbolTableBuilder(abstractSyntaxTree, _errorLog).BuildSymbolTable();
bool semanticCheckSuccess = true;
if (symbolTableSuccess != SymbolTableBuilder.ExitCode.FatalError)
{
semanticCheckSuccess = new SemanticsChecker(abstractSyntaxTree, _errorLog).RunCheck();
}
return (symbolTableSuccess == SymbolTableBuilder.ExitCode.Success) && semanticCheckSuccess;
}
public void ValidTypeDefinitionsTest()
{
var mainMethod = MethodDeclaration.CreateMainMethodDeclaration(new List<IStatement>(), 0, 0);
var mainClass = ClassDeclaration.CreateMainClassDeclaration("Foo", mainMethod, 0, 0);
var secondClass = new ClassDeclaration("Bar", null, new List<Declaration>(), 2, 0);
var thirdClass = new ClassDeclaration("Baz", null, new List<Declaration>(), 3, 0);
var program = new Program(mainClass, new List<ClassDeclaration>(
new [] { secondClass, thirdClass }));
var errorReporter = new ErrorLogger();
var builder = new SymbolTableBuilder(program, errorReporter);
builder.BuildSymbolTable();
var types = (program.Scope as GlobalScope).UserDefinedTypeNames.ToList();
Assert.Contains("Foo", types);
Assert.Contains("Bar", types);
Assert.Contains("Baz", types);
Assert.That(types, Is.Not.Contains("int"));
Assert.That(types, Is.Not.Contains("boolean"));
Assert.That(types.Count, Is.EqualTo(3));
}
private SymbolTableBuilder.ExitCode BuildSymbolTableFor(string program, out GlobalScope symbolTable)
{
var reader = new StringReader(program);
var scanner = new MiniJavaScanner(reader);
_errors = new ErrorLogger();
var parser = new Parser(scanner, _errors, true);
Program syntaxTree;
parser.TryParse(out syntaxTree);
reader.Close();
Assert.That(_errors.Errors, Is.Empty);
var symbolTableBuilder = new SymbolTableBuilder(syntaxTree, _errors);
Assert.That(_errors.Errors, Is.Empty);
var success = symbolTableBuilder.BuildSymbolTable();
symbolTable = syntaxTree.Scope as GlobalScope;
return success;
}