/// <summary>
/// The contrucutor loads the SpecialRegister file and stores
/// register and memory address in the symbol table.
/// </summary>
public CSymbolTable(String Filename)
: base()
{
XmlReader SpecialRegFile = null;
try
{
SpecialRegFile = XmlReader.Create(Filename, new XmlReaderSettings());
while (SpecialRegFile.Read() == true)
{
CVariable SpecialRegisters = null;
String VariableName = "";
Int16 MemoryLocation = 0;
if (SpecialRegFile.NodeType == XmlNodeType.Element)
{
if (Int16.TryParse(SpecialRegFile.GetAttribute("address"), out (short)MemoryLocation) == true)
{
SpecialRegFile.Read();
VariableName = SpecialRegFile.Value;
SpecialRegisters = new CVariable(VariableName, TDataType.INTEGER, 0, MemoryLocation);
Add(VariableName, SpecialRegisters);
}
}
}
}
catch (InvalidOperationException)
{
throw new CCompilerException("Cannot Open " + Filename, TErrorCodes.FILE_ACCESS_ERR);
}
finally
{
SpecialRegFile.Close();
}
}
/// <summary>
///
/// </summary>
public void ParameterDeclaration(CFunction FunctionDefinition)
{
String Argument = "";
CVariable NewIdentifier = null;
TypeSpecifier();
Argument = Declarator(FunctionDefinition);
NewIdentifier = new CVariable(Argument, TDataType.INTEGER,
m_LexScanner.ScopeLevelCount, 0);
FunctionDefinition.AddParameter(Argument);
m_SymbolTable.Add(Argument, NewIdentifier);
}
/// <summary>
///
/// </summary>
public void InitDeclarations()
{
CIdentiferBase NewIdentifier = null;
// used for debugging
String TokenVal = "";
if (m_LexScanner.Match(TTokens.IDENTIFIER) == false)
throw new CCompilerException("Identifier expected.", m_LexScanner.LineNumber,
TErrorCodes.PARSER_ERROR);
// add the variable to the symbol table.
// The key value for the symbol entry is the identifier name and
// scope level value and the name of the current function.
if (m_SymbolTable.ContainsKey(m_LexScanner.TokenValue) == true)
throw new CCompilerException("Identifier already declared.", m_LexScanner.LineNumber,
TErrorCodes.PARSER_ERROR);
else
{
TokenVal = m_LexScanner.TokenValue;
NewIdentifier = new CVariable(m_LexScanner.TokenValue, TDataType.INTEGER,
m_LexScanner.ScopeLevelCount, 0);
m_SymbolTable.Add(m_LexScanner.TokenValue, NewIdentifier);
}
if (m_LexScanner.NextToken() == TTokens.ASSIGNMENT)
{
AssignmentExpression(ref m_CurrentOperator);
}
while (m_LexScanner.NextToken() == TTokens.COMMA)
{
m_LexScanner.Match(TTokens.COMMA);
InitDeclarations();
}
}
