#include <stdbool.h>
#include <stdint.h>

#ifdef __CFORALL__
extern "C" {
#endif

#if ! defined(__CFA_INVOKE_PRIVATE__)
#ifndef _INVOKE_H_
#define _INVOKE_H_

      #define OFFSET_OF(type, field) ((intptr_t)( &((type*)0)->field))
      #define VPTR_OFFSET(type, vptr, field) (OFFSET_OF(type, field) - OFFSET_OF(type, vptr))

      struct coVtable_t { 
            void (*main)(void*);
            intptr_t offset_coroutine;
            intptr_t offset_object;
      };

      typedef struct coVtable_t* covptr_t;

      static inline struct coroutine* get_coroutine(covptr_t* vthis) {
            return (struct coroutine*) ( ((intptr_t)vthis) + ((intptr_t)(*vthis)->offset_coroutine) ); 
      }

      static inline void* get_object(covptr_t* vthis) {
            return (void*) ( ((intptr_t)vthis) + ((intptr_t)(*vthis)->offset_object) ); 
      }

      struct coStack_t {
            unsigned int size;		// size of stack
            void *storage;			// pointer to stack
            void *limit;			// stack grows towards stack limit
            void *base;				// base of stack
            void *context;			// address of cfa_context_t
            void *top;				// address of top of storage
            bool userStack;	
      };

      enum coroutine_state { Start, Inactive, Active, Halt };

      struct coroutine {
            struct coStack_t stack;
            const char *name;			// textual name for coroutine/task, initialized by uC++ generated code
            int errno_;				// copy of global UNIX variable errno
            enum coroutine_state state;	// current execution status for coroutine
            bool notHalted;			// indicate if execuation state is not halted

            struct coroutine *starter;	// first coroutine to resume this one
            struct coroutine *last;		// last coroutine to resume this one
      };

      void invokeCoroutine(covptr_t* this);
      void startCoroutine(covptr_t* this, void (*invoke)(covptr_t*));
#endif //_INVOKE_H_
#else //! defined(__CFA_INVOKE_PRIVATE__)
#ifndef _INVOKE_PRIVATE_H_
#define _INVOKE_PRIVATE_H_
      
     struct machine_context_t {
            void *SP;
            void *FP;
            void *PC;
      };

      // assembler routines that performs the context switch
      extern void coInvokeStub( void );
      void CtxSwitch( void *from, void *to ) asm ("CtxSwitch");

#endif //_INVOKE_PRIVATE_H_
#endif //! defined(__CFA_INVOKE_PRIVATE__)
#ifdef __CFORALL__
}
#endif