private void JumpToFunction()
{
AST_FunctionDefinitionNode functionDefinitionNode = (CurrentNode as AST_FunctionCall).FunctionDefinitionRef;
string functionName = functionDefinitionNode.getChild(1).getTokenString();
int nrOfParameters = functionDefinitionNode.getChild(2).getChildren().Count;
ReturnValue[] parameters = new ReturnValue[nrOfParameters];
for (int i = nrOfParameters - 1; i >= 0; i--)
{
parameters[i] = PopValue();
}
if (m_externalFunctionCreator.externalFunctions.ContainsKey(functionName))
{
//Console.WriteLine("Calling external function " + functionName);
ExternalFunctionCreator.OnFunctionCall fc = m_externalFunctionCreator.externalFunctions[functionName];
ReturnValue rv = fc(parameters);
if (rv.getReturnValueType() != ReturnValueType.VOID)
{
PushValue(rv);
}
}
else
{
PushNewScope(functionDefinitionNode.getScope(), functionName + "_memorySpace" + functionCounter++, functionDefinitionNode);
for (int i = nrOfParameters - 1; i >= 0; i--)
{
PushValue(parameters[i]); // reverse order
}
}
}
private AST functionDeclaration()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("function declaration");
#endif
if (m_isInsideFunctionDefinition)
{
throw new Error("Trying to define a function inside a function (are you missing the END word?)", Error.ErrorType.SYNTAX,
lookAhead(1).LineNr, lookAhead(1).LinePosition);
}
else
{
m_isInsideFunctionDefinition = true;
}
AST_FunctionDefinitionNode funcDeclarationTree =
new AST_FunctionDefinitionNode(new Token(Token.TokenType.FUNC_DECLARATION, "<FUNC_DECL>", lookAhead(1).LineNr, lookAhead(1).LinePosition));
funcDeclarationTree.addChild(match(Token.TokenType.BUILT_IN_TYPE_NAME)); // child 0 (function return type)
funcDeclarationTree.addChild(match(Token.TokenType.NAME)); // child 1 (function name)
match(Token.TokenType.PARANTHESIS_LEFT);
funcDeclarationTree.addChild(parameterList()); // child 2 (parameter list)
match(Token.TokenType.PARANTHESIS_RIGHT);
allowLineBreak();
funcDeclarationTree.addChild(statementList(false)); // child 3
match(Token.TokenType.BLOCK_END);
m_isInsideFunctionDefinition = false;
return(funcDeclarationTree);
}
private void JumpToFunction()
{
AST_FunctionDefinitionNode functionDefinitionNode = (CurrentNode as AST_FunctionCall).FunctionDefinitionRef;
string functionName = functionDefinitionNode.getChild(1).getTokenString();
#if BUILT_IN_PROFILING
ProfileData data = null;
if (m_profileData.TryGetValue(functionName, out data))
{
data.calls++;
}
else
{
m_profileData.Add(functionName, new ProfileData()
{
calls = 1,
totalTime = 0f,
});
}
#endif
var parameterDefs = functionDefinitionNode.getChild(2).getChildren();
//ASTPainter painter = new ASTPainter();
int nrOfParameters = parameterDefs.Count;
object[] parameters = new object[nrOfParameters];
for (int i = nrOfParameters - 1; i >= 0; i--)
{
//painter.PaintAST(parameterDefs[i]);
var paramDef = parameterDefs[i];
var declaration = paramDef.getChild(0) as AST_VariableDeclaration;
parameters[i] = ReturnValueConversions.ChangeTypeBasedOnReturnValueType(PopValue(), declaration.Type);
}
//try {
if (IsFunctionExternal(functionName))
{
CallExternalFunction(functionName, parameters);
}
else
{
PushNewScope(functionDefinitionNode.getScope(), functionName + "_memorySpace" + functionCounter++, functionDefinitionNode);
for (int i = nrOfParameters - 1; i >= 0; i--)
{
PushValue(parameters[i]); // reverse order
}
}
// }
// catch(Exception e) {
// Console.WriteLine("Exception when calling " + functionName + ": " + e.StackTrace);
// throw e;
// }
}
/// <summary>
/// Sets the program to execute function.
/// Returns true if the program had the function.
/// </summary>
public ProgramFunctionCallStatus SetProgramToExecuteFunction(string functionName, object[] args)
{
//Console.WriteLine ("Will execute '" + functionName + "' in global scope '" + m_globalScope + "'");
FunctionSymbol functionSymbol = (FunctionSymbol)m_globalScope.resolve(functionName);
//Console.WriteLine("Found function symbol: " + functionSymbol.ToString());
if (functionSymbol == null)
{
return(ProgramFunctionCallStatus.NO_FUNCTION);
}
if (IsFunctionExternal(functionName))
{
CallExternalFunction(functionName, args);
return(ProgramFunctionCallStatus.EXTERNAL_FUNCTION);
}
else
{
AST_FunctionDefinitionNode functionDefinitionNode = (AST_FunctionDefinitionNode)functionSymbol.getFunctionDefinitionNode();
if (functionDefinitionNode != null)
{
var parameters = functionDefinitionNode.getChild(2).getChildren();
int nrOfParameters = parameters.Count;
if (nrOfParameters != args.Length)
{
throw new Error("The function " + functionName + " takes " + nrOfParameters + " arguments, not " + args.Length);
}
Reset();
m_topLevelDepth = 1;
m_currentScope = functionDefinitionNode.getScope();
m_currentScope.ClearMemorySpaces();
string nameOfNewMemorySpace = functionName + "_memorySpace" + functionCounter++;
PushNewScope(functionDefinitionNode.getScope(), nameOfNewMemorySpace, functionDefinitionNode);
for (int i = args.Length - 1; i >= 0; i--)
{
var declaration = parameters[i].getChild(0) as AST_VariableDeclaration;
object convertedValue = ReturnValueConversions.ChangeTypeBasedOnReturnValueType(args[i], declaration.Type);
PushValue(convertedValue); // reverse order
}
//Console.WriteLine ("Ready to start running function '" + functionName + "' with memory space '" + nameOfNewMemorySpace + "'");
}
else
{
throw new Error(functionName + " has got no function definition node!");
}
}
return(ProgramFunctionCallStatus.NORMAL_FUNCTION); // all went well (starting the function)
}
private AST_FunctionDefinitionNode createFunctionDefinitionNode(string returnTypeName, string functionName, AST parameterList)
{
AST_FunctionDefinitionNode functionNode =
new AST_FunctionDefinitionNode(new Token(Token.TokenType.FUNC_DECLARATION, "<EXTERNAL_FUNC_DECLARATION>"));
functionNode.addChild(new Token(Token.TokenType.BUILT_IN_TYPE_NAME, returnTypeName));
functionNode.addChild(new Token(Token.TokenType.NAME, functionName));
functionNode.addChild(parameterList);
functionNode.addChild(new Token(Token.TokenType.STATEMENT_LIST, "<EMPTY_STATEMENT_LIST>"));
return functionNode;
}
private AST_FunctionDefinitionNode createFunctionDefinitionNode(string returnTypeName, string functionName, AST parameterList)
{
AST_FunctionDefinitionNode functionNode =
new AST_FunctionDefinitionNode(new Token(Token.TokenType.FUNC_DECLARATION, "<EXTERNAL_FUNC_DECLARATION>"));
functionNode.addChild(new Token(Token.TokenType.BUILT_IN_TYPE_NAME, returnTypeName));
functionNode.addChild(new Token(Token.TokenType.NAME, functionName));
functionNode.addChild(parameterList);
functionNode.addChild(new Token(Token.TokenType.STATEMENT_LIST, "<EMPTY_STATEMENT_LIST>"));
return(functionNode);
}
private void evaluateReferencesForFUNCTION_CALL(AST tree)
{
// Function name:
string functionName = tree.getTokenString();
var sym = m_currentScope.resolve(functionName);
FunctionSymbol function = sym as FunctionSymbol;
if (function == null)
{
m_errorHandler.errorOccured("Can't find function with name " + functionName,
Error.ErrorType.SCOPE,
tree.getToken().LineNr,
tree.getToken().LinePosition
);
}
else
{
#if WRITE_DEBUG_INFO
Console.WriteLine("Resolved function call with name " + functionName + " (on line " + tree.getToken().LineNr + ")");
#endif
// Parameters
evaluateReferencesInAllChildren(tree);
AST node = function.getFunctionDefinitionNode();
AST_FunctionDefinitionNode functionDefinitionTree = (AST_FunctionDefinitionNode)(node);
/*if(functionDefinitionTree.getTokenString() != "<EXTERNAL_FUNC_DECLARATION>") {
* evaluateReferencesForFUNC_DECLARATION(functionDefinitionTree);
* }*/
// Setup reference to Function Definition AST node
AST_FunctionCall functionCallAst = tree as AST_FunctionCall;
Debug.Assert(functionCallAst != null);
functionCallAst.FunctionDefinitionRef = functionDefinitionTree;
List <AST> calleeParameterList = functionDefinitionTree.getChild(2).getChildren();
// Check that the number of arguments is right
AST callerParameterList = tree.getChild(0);
List <AST> arguments = callerParameterList.getChildren();
if (arguments.Count != calleeParameterList.Count)
{
m_errorHandler.errorOccured(
"Wrong nr of arguments to '" + functionDefinitionTree.getChild(1).getTokenString() + "' , expected " + calleeParameterList.Count + " but got " + arguments.Count
, Error.ErrorType.SYNTAX, tree.getToken().LineNr, tree.getToken().LinePosition);
}
}
}
private void evaluateFunctionScope(AST tree)
{
// Define function name
ReturnValueType returnType = ReturnValue.getReturnValueTypeFromString(tree.getChild(0).getTokenString());
string functionName = tree.getChild(1).getTokenString();
Symbol functionScope = new FunctionSymbol(m_currentScope, functionName, returnType, tree);
m_globalScope.define(functionScope); // all functions are saved in the global scope
m_currentScope = (Scope)functionScope;
AST_FunctionDefinitionNode functionCallNode = (AST_FunctionDefinitionNode)(tree);
functionCallNode.setScope((Scope)functionScope);
#if WRITE_DEBUG_INFO
Console.WriteLine("\nDefined function with name " + functionName + " and return type " + returnType);
#endif
// Process the body of the function
evaluateScopeDeclarations(tree.getChild(3));
m_currentScope = m_currentScope.getEnclosingScope(); // pop scope
}
private AST functionDeclaration()
{
#if WRITE_DEBUG_INFO
Console.WriteLine("function declaration");
#endif
if (m_isInsideFunctionDefinition) {
throw new Error("Trying to define a function inside a function (are you missing the END word?)", Error.ErrorType.SYNTAX,
lookAhead(1).LineNr, lookAhead(1).LinePosition);
} else {
m_isInsideFunctionDefinition = true;
}
AST_FunctionDefinitionNode funcDeclarationTree =
new AST_FunctionDefinitionNode(new Token(Token.TokenType.FUNC_DECLARATION, "<FUNC_DECL>", lookAhead(1).LineNr, lookAhead(1).LinePosition));
funcDeclarationTree.addChild(match(Token.TokenType.BUILT_IN_TYPE_NAME)); // child 0 (function return type)
funcDeclarationTree.addChild(match(Token.TokenType.NAME)); // child 1 (function name)
match(Token.TokenType.PARANTHESIS_LEFT);
funcDeclarationTree.addChild(parameterList()); // child 2 (parameter list)
match(Token.TokenType.PARANTHESIS_RIGHT);
allowLineBreak();
funcDeclarationTree.addChild(statementList(false)); // child 3
match(Token.TokenType.BLOCK_END);
m_isInsideFunctionDefinition = false;
return funcDeclarationTree;
}
private ReturnValue function(AST tree, List <ReturnValue> parameterValues)
{
// Push scope
Scope m_previousScope = m_currentScope;
AST_FunctionDefinitionNode functionDefinitionNode = (AST_FunctionDefinitionNode)(tree);
Assert.IsNotNull(functionDefinitionNode);
m_currentScope = (Scope)functionDefinitionNode.getScope();
Assert.IsNotNull(m_currentScope);
// Push memory space
MemorySpace m_previousMemorySpace = m_currentMemorySpace;
MemorySpace functionMemorySpace =
new MemorySpace("<FUNCTION_SPACE " + tree.getChild(1).getTokenString() + ">");
m_memoryStack.Push(functionMemorySpace);
m_currentMemorySpace = functionMemorySpace;
// Add parameters to memory space
List <AST> parameterDeclarations = tree.getChild(2).getChildren();
if (parameterDeclarations != null)
{
if (parameterDeclarations.Count != parameterValues.Count)
{
m_errorHandler.errorOccured(
"The number of arguments in function " +
tree.getChild(1).getTokenString() +
" does not match!",
Error.ErrorType.SYNTAX);
}
foreach (AST parameter in parameterDeclarations)
{
varDeclaration(parameter);
}
}
// Assign values to parameters
if (parameterValues != null)
{
int i = 0;
foreach (ReturnValue parameterValue in parameterValues)
{
string parameterName = parameterDeclarations[i].getChild(1).getTokenString();
assignValue(parameterName, parameterValue);
i++;
}
}
// Execute function
ReturnValue returnValue = null;
try {
executeAllChildNodes(tree.getChild(3)); // child 3 is the function body
}
catch (ReturnValue functionReturnValue) {
returnValue = functionReturnValue;
}
// Pop memory space
m_memoryStack.Pop();
m_currentMemorySpace = m_previousMemorySpace;
// Pop scope
m_currentScope = m_previousScope;
Assert.IsNotNull(m_currentScope);
return(returnValue);
}
