public void pushScope(boolean bInitialInstanceMethodScope) {
   if (_scopes == null) {
     _scopes = new Stack<IRScope>();
   }
   IRScope parent = _scopes.isEmpty() ? null : _scopes.peek();
   _scopes.push(new IRScope(parent));
   if (bInitialInstanceMethodScope) {
     assert parent == null;
     _scopes.peek().addSymbol(Keyword.KW_this.getName(), _context.getIRTypeForCurrentClass());
   }
 }
 public IRSymbol getSymbol(String symbolName) {
   IRSymbol symbol = _scopes.peek().getSymbol(symbolName);
   if (symbol == null) {
     throw new IllegalStateException("No symbol found named " + symbolName);
   }
   return symbol;
 }
 public IRSymbol makeAndIndexTempSymbol(String strNameSuffix, IRType type) {
   String strName =
       strNameSuffix != null ? TEMP_VAR_PREFIX + strNameSuffix : TEMP_VAR_PREFIX + _tempVarCount++;
   IRSymbol symbol = new IRSymbol(strName, type, true);
   _scopes.peek().addSymbol(symbol);
   return symbol;
 }
 public IRSymbol getTypeParamIndex(TypeVariableType type) {
   return _scopes
       .peek()
       .getSymbol(AbstractElementTransformer.TYPE_PARAM_PREFIX + type.getRelativeName());
 }
 public IRSymbol createSymbol(String name, IRType type) {
   return _scopes.peek().addSymbol(name, type);
 }
 public void putSymbol(IRSymbol symbol) {
   _scopes.peek().addSymbol(symbol);
 }
 public boolean hasSymbol(String symbolName) {
   return _scopes.peek().getSymbol(symbolName) != null;
 }