58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
#ifndef __CUT_C_H__
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#define __CUT_C_H__
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/* Some definitions */
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#define Choice_Point_Type void *
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/* necessary for not redefine NULL*/
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#ifndef NULL
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#define NULL nil
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#endif
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typedef struct cut_c_str *cut_c_str_ptr;
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struct cut_c_str{
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cut_c_str_ptr before;
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void *try_userc_cut_yamop;
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};
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#define CUT_C_STR_SIZE ((sizeof(struct cut_c_str))/(sizeof(CELL)))
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#define EXTRA_CBACK_CUT_ARG(Type,Offset) \
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((Type) (*(Type *)(((CELL *)Yap_REGS.CUT_C_TOP) - (((yamop *)Yap_REGS.CUT_C_TOP->try_userc_cut_yamop)->u.OtapFs.extra)) + (Offset-1)))
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#define CUT_C_PUSH(YAMOP,S_YREG) \
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{ \
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if ((YAMOP)->u.OtapFs.f){ \
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S_YREG = S_YREG - CUT_C_STR_SIZE; \
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cut_c_str_ptr new_top = (cut_c_str_ptr) S_YREG; \
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new_top->try_userc_cut_yamop = YAMOP; \
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cut_c_push(new_top); \
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} \
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}
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#define POP_CHOICE_POINT(cp) \
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(((CELL *)Yap_REGS.CUT_C_TOP != (CELL *)LOCAL_LocalBase) && ((CELL *)(cp) > (CELL *)Yap_REGS.CUT_C_TOP))
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#define POP_EXECUTE() \
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cut_c_str_ptr TOP = Yap_REGS.CUT_C_TOP; \
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CPredicate func = (CPredicate)((yamop *)TOP->try_userc_cut_yamop)->u.OtapFs.f; \
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PredEntry *pred = (PredEntry *)((yamop *)TOP->try_userc_cut_yamop)->u.OtapFs.p; \
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Yap_StartSlots( PASS_REGS1 ); \
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YAP_ExecuteOnCut(pred, func, TOP); \
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Yap_CloseSlots( PASS_REGS1 ); \
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cut_c_pop();
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/*Initializes CUT_C_TOP*/
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void cut_c_initialize(void);
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/*Removes a choice_point from the stack*/
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void cut_c_pop(void);
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/*Insert a choice_point in the stack*/
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void cut_c_push(cut_c_str_ptr);
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#endif /*_CUT_C_H__*/
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