#ifndef pac_dataptr_h
#define pac_dataptr_h

#include <string>

#include "pac_common.h"
#include "pac_dbg.h"

// A data pointer is represented by an data pointer variable
// plus a constant offset.

class DataPtr
	{
public:
	DataPtr(Env* env, const ID* arg_id, const int arg_off);
	DataPtr(DataPtr const& x) { *this = x; }

	DataPtr const& operator=(DataPtr const& x)
		{
		id_ = x.id();
		offset_ = x.offset();
		ptr_expr_ = x.ptr_expr();

		return *this;
		}

	const ID* id() const { return id_; }
	int offset() const { return offset_; }

	const char* ptr_expr() const
		{
		ASSERT(id_);
		return ptr_expr_.c_str();
		}

	int AbsOffset(const ID* base_ptr) const;
	char* AbsOffsetExpr(Env* env, const ID* base_ptr) const;

	void GenBoundaryCheck(Output* out, Env* env, const char* data_size,
	                      const char* data_name) const;

protected:
	const ID* id_;
	int offset_;
	string ptr_expr_;
	};

#endif // pac_dataptr_h