/*

  * Copyright (C) 2012 David Anderson

  *

  * This file is part of JITCraft.

  *

  * JITCraft is free software: you can redistribute it and/or modify it under

  * the terms of the GNU General Public License as published by the Free

  * Software Foundation, either version 3 of the License, or (at your option)

  * any later version.

  * 

  * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY

  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License along with

  * JITCraft. If not, see http://www.gnu.org/licenses/.

  */

 #ifndef _include_jitcraft_scopes_h_

 #define _include_jitcraft_scopes_h_

 #include <vector>

 #include "PoolAllocator.h"

 #include "AST.h"

 #include "NameBinding.h"

 namespace jc {

 class Scope : public PoolObject

 {

     PoolAllocator &pool_;

     std::vector<BoundName *> names_;

     std::vector<Scope *> children_;

     std::vector<Variable *> parameters_;

     unsigned locals_;

     unsigned maxContainedLocals_;

     unsigned numFunctions_;

     bool empty() const {

         return names_.size() == 0;

     }

     void unlink();

   public:

     enum Kind {

         GLOBAL,

         FUNCTION,

         BLOCK

     };

   public:

     Scope(PoolAllocator &pool, Kind kind, Scope *enclosing);

     bool initialize();

     Kind kind() const {

         return kind_;

     }

     Scope *enclosing() const {

         return enclosing_;

     }

     unsigned locals() const {

         return locals_;

     }

     unsigned maxContainedLocals() const {

         return maxContainedLocals_;

     }

     unsigned numFunctions() const {

         return numFunctions_;

     }

     unsigned numArguments() const {

         return parameters_.size();

     }

     Variable *getArgument(size_t index) {

         return parameters_[index];

     }

     Scope *unlinkIfEmpty();

     BoundName *localLookup(Name *name);

     BoundName *lookup(Name *name);

     NamedFunction *declareFunction(Name *name);

     Variable *declareVariable(Name *name);

     Variable *declareArgument(Name *name);

     void allocate();

     void allocateGlobals();

   public:

     static bool BindAndAllocate(ParseTree *tree);

   private:

     Kind kind_;

     Scope *enclosing_;

 };

 }

 #endif // _include_jitcraft_scopes_h_