CallStack.h

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// 
//   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
//   Free Software Foundation, Inc
// 
// This program 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.
// 
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

#ifndef GNASH_VM_CALL_STACK_H
#define GNASH_VM_CALL_STACK_H

#include <vector>

#include "as_value.h"

// Forward declarations
namespace gnash {
    class as_object;
    struct ObjectURI;
    class UserFunction;
}

namespace gnash {

//
//
class CallFrame
{
public:

    typedef std::vector<as_value> Registers;

    //
    CallFrame(UserFunction* func);
    
    CallFrame(const CallFrame& other)
        :
        _locals(other._locals),
        _func(other._func),
        _registers(other._registers)
    {}

    CallFrame& operator=(const CallFrame& other) {
        _locals = other._locals;
        _func = other._func;
        _registers = other._registers;
        return *this;
    }

    as_object& locals() {
        return *_locals;
    }

    UserFunction& function() {
        return *_func;
    }

    //
    const as_value* getLocalRegister(size_t i) const {
        if (i >= _registers.size()) return nullptr;
        return &_registers[i];
    }

    //
    //
    void setLocalRegister(size_t i, const as_value& val);

    //
    bool hasRegisters() const {
        return !_registers.empty();
    }

    //
    void markReachableResources() const;


private:

    friend std::ostream& operator<<(std::ostream&, const CallFrame&);

    as_object* _locals;

    UserFunction* _func;
    
    Registers _registers;

};

//
//
void declareLocal(CallFrame& c, const ObjectURI& name);

//
//
void setLocal(CallFrame& c, const ObjectURI& name, const as_value& val);

typedef std::vector<CallFrame> CallStack;

std::ostream& operator<<(std::ostream& o, const CallFrame& fr);

} // namespace gnash

#endif // GNASH_VM_CALL_STACK_H