private void EnterIdentifiers(IEnumerable <IdentifierNode> identifiers, SymbolTableEntryType type, ref int localVariableIndex)
{
int index;
if (type == SymbolTableEntryType.Parameter)
{
index = 0;
}
else if (type == SymbolTableEntryType.Variable)
{
index = localVariableIndex;
}
else
{
throw new ArgumentException("type must be Parameter or Variable", "type");
}
foreach (var identifier in identifiers)
{
string scopeString = _scopeStack.CreateScopeString(identifier.Name);
var entry = new SymbolTableEntry(identifier.Name, type, index);
AddSymbol(scopeString, entry);
++index;
}
if (type == SymbolTableEntryType.Variable)
{
localVariableIndex = index;
}
}
private int GetLocalsIndex(SymbolTableEntry entry)
{
if (entry.Type == SymbolTableEntryType.Parameter)
{
return(entry.Index);
}
return(_parameterCounts.Peek() + entry.Index);
}
/// <summary>
/// Creates a baseline table entry and inserts it into the symbol table.
/// </summary>
/// <param name="entryType"></param>
public ISymbolTableEntry CreateTableEntry(EntryType entryType)
{
SymbolTableEntry entry = new SymbolTableEntry(Token.idt, lexeme.ToString(), depth, entryType);
CheckDuplicates();
Insert(entry);
return(entry);
}
public void FindSymbols(ProgramNode program)
{
// We want functions to be callable independently of their declaration order, so we do a first pass to find all function names
foreach (var function in program.Functions)
{
var entry = new SymbolTableEntry(function.Name.Name, SymbolTableEntryType.Function, 0);
AddSymbol(function.Name.Name, entry);
}
foreach (var function in program.Functions)
{
_scopeStack.PushScope(function.Name.Name);
int unused = 0;
EnterIdentifiers(function.Parameters, SymbolTableEntryType.Parameter, ref unused);
int localVariableIndex = 0;
FindSymbolsRecursively(function.Body, ref localVariableIndex);
_scopeStack.PopScope();
function.LocalVariableCount = localVariableIndex;
}
}
public void FindSymbols(ProgramNode program)
{
// We want functions to be callable independently of their declaration order, so we do a first pass to find all function names
foreach (var function in program.Functions)
{
var entry = new SymbolTableEntry(function.Name.Name, SymbolTableEntryType.Function, 0);
AddSymbol(function.Name.Name, entry);
}
foreach (var function in program.Functions)
{
_scopeStack.PushScope(function.Name.Name);
int unused = 0;
EnterIdentifiers(function.Parameters, SymbolTableEntryType.Parameter, ref unused);
int localVariableIndex = 0;
FindSymbolsRecursively(function.Body, ref localVariableIndex);
_scopeStack.PopScope();
function.LocalVariableCount = localVariableIndex;
}
}
private void EnterIdentifiers(IEnumerable<IdentifierNode> identifiers, SymbolTableEntryType type, ref int localVariableIndex)
{
int index;
if (type == SymbolTableEntryType.Parameter)
index = 0;
else if (type == SymbolTableEntryType.Variable)
index = localVariableIndex;
else
throw new ArgumentException("type must be Parameter or Variable", "type");
foreach (var identifier in identifiers)
{
string scopeString = _scopeStack.CreateScopeString(identifier.Name);
var entry = new SymbolTableEntry(identifier.Name, type, index);
AddSymbol(scopeString, entry);
++index;
}
if (type == SymbolTableEntryType.Variable)
localVariableIndex = index;
}
private void AddSymbol(string key, SymbolTableEntry entry)
{
_symbols.Add(key, entry);
}
private void AddSymbol(string key, SymbolTableEntry entry)
{
_symbols.Add(key, entry);
}
private int GetLocalsIndex(SymbolTableEntry entry)
{
if (entry.Type == SymbolTableEntryType.Parameter)
return entry.Index;
return _parameterCounts.Peek() + entry.Index;
}
