public override void CheckSemantics(TigerScope scope, Report report)
{
ContainingScope = scope;
//Check children
IdNode.CheckSemantics(scope, report);
ExpressionNode.CheckSemantics(scope, report);
if (!IdNode.IsOK || !ExpressionNode.IsOK)
{
return;
}
//Check use of variable name
if (!scope.VariableNameAvailable(IdNode.Name))
{
report.AddError(SemanticErrors.VariableNameAlreadyInUse(IdNode, IdNode.Name));
return;
}
//Check children types
if (TigerType.AreOfSameType(ExpressionNode.TigerType, TigerType.Nil) || TigerType.AreOfSameType(ExpressionNode.TigerType, TigerType.Void))
{
report.AddError(SemanticErrors.InvalidImplicitVariableDeclaration(ExpressionNode, ExpressionNode.TigerType));
return;
}
//Add variable to scope
VariableInfo = scope.DefineVariable(IdNode.Name, ExpressionNode.TigerType, scope);
IsOK = true;
}
public void CheckBodySemantics(TigerScope scope, Report report)
{
//If CheckSemantics failed (FunctionInfo was not created) return
if (!IsOK)
{
return;
}
IsOK = false;
//Create function scope
FunctionBodyNode.CheckSemantics(FunctionScope, report);
if (!FunctionBodyNode.IsOK)
{
return;
}
IsOK = true;
if (ReturnTypeNode != null && !ReturnTypeNode.TigerType.Assignable(FunctionBodyNode.TigerType))
{
report.AddError(SemanticErrors.IncompatibleFunctionReturnTypeBody(FunctionBodyNode, ReturnTypeNode.TigerType, FunctionBodyNode.TigerType));
}
else if (ReturnTypeNode == null && !TigerType.AreOfSameType(TigerType.Void, FunctionBodyNode.TigerType))
{
report.AddError(SemanticErrors.IncompatibleFunctionReturnTypeBody(FunctionBodyNode, TigerType.Void, FunctionBodyNode.TigerType));
}
}
public override void GenerateCode(ILGenerator generator)
{
var saveFields = ContainingScope.FieldsToFunctionDeclaration(FunctionInfo);
foreach (var fieldBuilder in saveFields)
{
generator.Emit(OpCodes.Ldsfld, fieldBuilder);
}
foreach (var expressionNode in Arguments)
{
expressionNode.GenerateCode(generator);
}
var method = FunctionInfo.MethodBuilder;
generator.Emit(OpCodes.Call, method);
LocalBuilder methodResult = null;
if (!TigerType.AreOfSameType(FunctionInfo.ReturnType, TigerType.Void))
{
methodResult = generator.DeclareLocal(FunctionInfo.ReturnType.Type);
generator.Emit(OpCodes.Stloc, methodResult);
}
foreach (var t in saveFields)
{
generator.Emit(OpCodes.Stsfld, t);
}
if (!TigerType.AreOfSameType(FunctionInfo.ReturnType, TigerType.Void))
{
generator.Emit(OpCodes.Ldloc, methodResult);
}
}
public override void GenerateCode(ILGenerator generator)
{
if (InstructionNodes.Length == 0)
{
return;
}
for (var i = 0; i < InstructionNodes.Length - 1; i++)
{
InstructionNodes[i].GenerateCode(generator);
if (!TigerType.AreOfSameType(InstructionNodes[i].TigerType, TigerType.Void))
{
generator.Emit(OpCodes.Pop);
}
}
InstructionNodes.Last().GenerateCode(generator);
}
public override void CheckSemantics(TigerScope scope, Report report)
{
ContainingScope = scope;
//Check children
LeftOperandNode.CheckSemantics(scope, report);
RightOperandNode.CheckSemantics(scope, report);
if (!LeftOperandNode.IsOK || !RightOperandNode.IsOK)
{
return;
}
TigerType = TigerType.Int;
//Check children types
if (!TigerType.AreCompatible(LeftOperandNode.TigerType, RightOperandNode.TigerType) ||
(TigerType.AreOfSameType(LeftOperandNode.TigerType, TigerType.Nil) && TigerType.AreOfSameType(RightOperandNode.TigerType, TigerType.Nil)))
{
report.AddError(SemanticErrors.InvalidIdentityComparison(this, LeftOperandNode.TigerType,
RightOperandNode.TigerType));
}
}
private static int Main(string[] args)
{
Console.WriteLine("Tiger Compiler version 1.0");
Console.WriteLine(@"Copyright (C) 2015-2016 Laila González Fernández & Mario César Muñiz Jiménez");
//Creating report, parser and lexer
var arg = args[0];
var report = new Report();
var characters = new ANTLRFileStream(arg);
var lexer = new TigerLexer(report, characters);
var tokens = new CommonTokenStream(lexer);
var parser = new TigerParser(report, tokens)
{
TraceDestination = Console.Out,
TreeAdaptor = new TreeAdaptor()
};
//Syntactic analysis
var ret = (ProgramNode)parser.program().Tree;
if (!report.IsOk)
{
foreach (var message in report)
{
Console.WriteLine($"({message.Line}, {message.Column}): {message.Text}");
}
return(1);
}
//Preparing assembly
var name = Path.GetFileNameWithoutExtension(arg);
var filename = name + ".exe";
var assemblyName = new AssemblyName(name);
var assembly = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave);
var moduleBuilder = assembly.DefineDynamicModule(name, filename);
var programType = moduleBuilder.DefineType(name + ".Program", TypeAttributes.Public);
var mainMethod = programType.DefineMethod("Main", MethodAttributes.Static | MethodAttributes.Public, typeof(void), Type.EmptyTypes);
var generator = mainMethod.GetILGenerator();
assembly.SetEntryPoint(mainMethod);
ProgramNode.Module = moduleBuilder;
ProgramNode.Program = programType;
//Semantic analysis
ret.CheckSemantics(new TigerScope(programType), report);
if (!report.IsOk)
{
foreach (var message in report)
{
Console.WriteLine($"({message.Line}, {message.Column}): {message.Text}");
}
return(1);
}
generator.BeginExceptionBlock();
//Code generation
ret.GenerateCode(generator);
if (!TigerType.AreOfSameType(ret.TigerType, TigerType.Void))
{
generator.Emit(OpCodes.Pop);
}
generator.BeginCatchBlock(typeof(Exception));
generator.BeginScope();
LocalBuilder exception = generator.DeclareLocal(typeof(Exception));
MethodInfo writeLineSO = typeof(TextWriter).GetMethod("WriteLine", new Type[] { typeof(string), typeof(object) });
MethodInfo writeLineS = typeof(TextWriter).GetMethod("WriteLine", new Type[] { typeof(string) });
MethodInfo standardErrorOutput = typeof(Console).GetProperty("Error").GetGetMethod();
generator.Emit(OpCodes.Stloc, exception);
generator.Emit(OpCodes.Call, standardErrorOutput);
generator.Emit(OpCodes.Ldstr, "Exception of type '{0}' was thrown.");
generator.Emit(OpCodes.Ldloc, exception);
generator.Emit(OpCodes.Callvirt, typeof(Exception).GetMethod("GetType", Type.EmptyTypes));
generator.Emit(OpCodes.Callvirt, typeof(Type).GetProperty("Name").GetGetMethod());
generator.Emit(OpCodes.Callvirt, writeLineSO);
generator.Emit(OpCodes.Call, standardErrorOutput);
generator.Emit(OpCodes.Ldloc, exception);
generator.Emit(OpCodes.Callvirt, typeof(Exception).GetProperty("Message").GetGetMethod());
generator.Emit(OpCodes.Callvirt, writeLineS);
generator.EndScope();
generator.Emit(OpCodes.Ldc_I4_1);
generator.Emit(OpCodes.Call, typeof(Environment).GetMethod("Exit"));
generator.EndExceptionBlock();
generator.Emit(OpCodes.Ret);
programType.CreateType();
assembly.Save(filename);
return(0);
}