[Libjit-developers] First Attempt at libjit

[manoloohara]

I'm trying to make a simple microprocessor emulator, but I don't know how to 
work with pointers with libjit.
I want to put a 0 in the more significative byte (msb) of AX.
Here is my code. It doesn't compile, and I don't know why.

Any idea?

#include <stdio.h>
#include <jit/jit-plus.h>


class register_class
{ 
private: jit_ubyte msb,lsb;

public: void msb_write(jit_ubyte new_value)
        {msb=new_value; }

        jit_ubyte *msb_address(void)
        {return (&msb); }  

        void lsb_write(jit_ubyte new_value)
        {lsb=new_value; }

        jit_ubyte *lsb_address(void)
        {return (&lsb);}  

        void print(void)
        {printf("msb= %d lsb=%d\n",msb,lsb);
        }
};


class ld_zero_function : public jit_function
{
public: register_class AX;

        jit_function_t function;
        
        ld_zero_function(jit_context& context) : jit_function(context)
            {create();}

        void print(void);
        
protected:
        virtual jit_type_t create_signature();
        virtual void build();
};

void ld_zero_function::print(void)
        {AX.print();}

 
jit_type_t ld_zero_function::create_signature()
{       return signature_helper (jit_type_void,  end_params);
        // Return type, terminated with "end_params".
}

void ld_zero_function::build()
{// Put 0 in AX.msb;
 jit_value_t x,temp1,zero_ubyte,y;
 zero_ubyte=jit_value_create_nint_constant(jit_function_t(),jit_type_ubyte,0);
 y=jit_type_create_pointer(jit_type_ubyte,1);
 y=jit_insn_load(jit_function_t(),AX.msb_address); //DOESN'T COMPILE. WHY?
 x=jit_insn_load_relative(jit_function_t(),y,0,jit_type_int);
 temp1=jit_insn_load_relative(jit_function_t(),x,0,jit_type_int); 
 jit_insn_store_relative(jit_function_t(),temp1,0,zero_ubyte);
};

int main(int argc, char **argv)
{ void *dummy_args[0];
        // Create a context to hold the JIT's primary state.
        jit_context context;

        // Create the function object.
        ld_zero_function ld_zero(context);

        // Execute the function.
        ld_zero.apply(dummy_args,dummy_args);
        // Print AX
        ld_zero.print();
        /* Finished */
        return 0;
}

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