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yap-6.3/H/cut_c.h

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#ifndef __CUT_C_H__
#define __CUT_C_H__
/* Some definitions */
#define Choice_Point_Type void *
/* necessary for not redefine NULL*/
#ifndef NULL
#define NULL nil
#endif
typedef struct cut_c_str *cut_c_str_ptr;
struct cut_c_str {
cut_c_str_ptr before;
void *try_userc_cut_yamop;
};
#define CUT_C_STR_SIZE ((sizeof(struct cut_c_str)) / (sizeof(CELL)))
#define EXTRA_CBACK_CUT_ARG(Type, Offset) EXTRA_CBACK_ARG(PP->ArityOfPE, Offset)
#define CBACK_CUT_ARG(Offset) B->cp_args[(Offset)-1]
#define CUT_C_PUSH(YAMOP, S_YREG) \
{ \
if ((YAMOP)->y_u.OtapFs.f) { \
S_YREG = S_YREG - CUT_C_STR_SIZE; \
cut_c_str_ptr new_top = (cut_c_str_ptr)S_YREG; \
new_top->try_userc_cut_yamop = YAMOP; \
cut_c_push(new_top); \
} \
}
#define POP_CHOICE_POINT(cp) \
(((CELL *)Yap_REGS.CUT_C_TOP != (CELL *)LOCAL_LocalBase) && \
((CELL *)(cp) > (CELL *)Yap_REGS.CUT_C_TOP))
#define POP_EXECUTE() \
cut_c_str_ptr TOP = Yap_REGS.CUT_C_TOP; \
CPredicate func = \
(CPredicate)((yamop *)TOP->try_userc_cut_yamop)->y_u.OtapFs.f; \
PredEntry *pred = \
(PredEntry *)((yamop *)TOP->try_userc_cut_yamop)->y_u.OtapFs.p; \
YAP_ExecuteOnCut(pred, func, TOP); \
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cut_c_pop();
#define POP_FAIL(handler) \
if (handler) { yamop *oap = handler->cp_ap; \
handler->cp_ap = NOCODE; \
P = (yamop *)FAILCODE; \
choiceptr olB = B; B = handler; \
HR = handler->cp_h; \
/* DBTerm *ref = Yap_RefToException(); */ \
Yap_exec_absmi(true, false); \
B = olB; handler->cp_ap = oap; }
#define POP_FAIL_EXECUTE(handler) \
POP_FAIL(handler); \
cut_c_str_ptr TOP = Yap_REGS.CUT_C_TOP; \
CPredicate func = \
(CPredicate)((yamop *)TOP->try_userc_cut_yamop)->y_u.OtapFs.f; \
PredEntry *pred = \
(PredEntry *)((yamop *)TOP->try_userc_cut_yamop)->y_u.OtapFs.p; \
YAP_ExecuteOnCut(pred, func, TOP); \
cut_c_pop();
/*Initializes CUT_C_TOP*/
void cut_c_initialize(int wid);
/*Removes a choice_point from the stack*/
void cut_c_pop(void);
/*Insert a choice_point in the stack*/
void cut_c_push(cut_c_str_ptr);
#endif /*_CUT_C_H__*/