interpreter.hh

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#pragma once
#include <string>
#include <unordered_map>
#include <forward_list>
#include <vector>
#include "runtime.hh"

namespace Interpreter
{
    extern bool forceCompiler;
    using MysoreScript::Obj;
    class Value
    {
        Obj *holder = nullptr;
        Obj object;
        void set(Obj o);
        public:
        Obj *address()
        {
            return &object;
        }
        Value() : object(nullptr) {}
        Value(Obj o) : object(nullptr) { set(o); }
        Value(Value &o) : object(nullptr) { set(static_cast<Obj>(o)); }
        Value(Value &&o) : object(nullptr)
        {
            set(static_cast<Obj>(o));
            o.set(nullptr);
        }
        ~Value();
        void operator=(Obj o) { set(o); }
        void operator=(Value &o) { set(static_cast<Obj>(o)); }
        operator Obj()
        {
            return object;
        }
        bool isInteger()
        {
            return ((reinterpret_cast<intptr_t>(object)) & 7) == 1;
        }
        int getIntValue()
        {
            assert(isInteger());
            return reinterpret_cast<intptr_t>(object) >> 3;
        }
    };
    typedef std::unordered_map<std::string, Obj*> SymbolTable;
    class Context
    {
        std::forward_list<Value> globals;
        std::vector<SymbolTable*> symbols;
        public:
        SymbolTable globalSymbols;
        Value retVal = nullptr;
        bool isReturning = false;
        void pushSymbols(SymbolTable &s) { symbols.push_back(&s); }
        void popSymbols() { symbols.pop_back(); }
        Obj *lookupSymbol(const std::string &name);
        void setSymbol(const std::string &name, Obj *val);
        void setSymbol(const std::string &name, Obj val);
    };
    extern MysoreScript::ClosureInvoke closureTrampolines[];
};