195 lines
6.9 KiB
C
195 lines
6.9 KiB
C
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/*************************************************************************
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* *
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* BEAM -> Basic Extended Andorra Model *
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* BEAM extends the YAP Prolog system to support the EAM *
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* *
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* Copyright: Ricardo Lopes and NCC - University of Porto, Portugal *
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* *
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**************************************************************************
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* comments: eam compiler data structures and routines *
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*************************************************************************/
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#define Print_Code 0
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/* To help on compiler debuging
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1 -> show predicates info
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2 -> show YAP abstract machine code (YAAM)
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4 -> show YAAM after transformation
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8 -> show indexing code
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16 -> show EAM intermediate code
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32 -> show EAM intermediate code with direct_calls
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128 -> show EAM abstrac machine code
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*/
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#define Variavel 1
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#define Lista 2
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#define Estrutura 4
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#define Constante 8
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typedef unsigned long Cell;
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typedef struct PCODE{
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struct PCODE *nextInst;
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int op, new1;
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unsigned long new4;
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} CInstr;
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struct Clauses {
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unsigned int idx; /* info for indexing on first arg */
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Cell val; /* atom or functor in first arg */
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unsigned int nr_vars; /* nr of local vars */
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struct Predicates *predi; /* predicate struct */
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int side_effects; /* clause has side effects */
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Cell *code;
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struct Clauses *next; /* next clause within the same predicate */
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};
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struct HASH_TABLE {
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Cell value;
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Cell *code;
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struct HASH_TABLE *next;
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};
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struct Predicates { /* To register information about predicates */
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unsigned long id;
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unsigned char *name;
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unsigned int arity;
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unsigned int nr_alt; /* nr of alternativas */
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unsigned int calls; /* nr of existent calls to this predicate */
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struct Clauses *first;
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struct Clauses *last;
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int idx; /* is code indexed ? 0= needs compilation -1= no indexing possible 1= indexed */
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unsigned int idx_var; /* nr clauses with 1st argument var */
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unsigned int idx_list; /* nr clauses with 1st argument list */
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unsigned int idx_atom; /* nr clauses with 1st argument atom */
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unsigned int idx_functor; /* nr clauses with 1st argument functor */
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short int eager_split; /* allow eager splitting */
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Cell *code; /* try, retry and trust code or Indexing code */
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struct HASH_TABLE **atom;
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struct HASH_TABLE **functor;
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Cell *list;
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Cell *vars;
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struct Predicates *next;
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};
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/**************************** EAM TRUE STUFF *************/
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struct SUSPENSIONS {
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struct AND_BOX *and_box; /* And_box where the variable has suspended */
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short int reason; /* suspended before executing call number nr_call */
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struct SUSPENSIONS *next; /* Pointer to the next suspention */
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struct SUSPENSIONS *prev;
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};
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struct SUSPENSIONS_VAR {
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struct AND_BOX *and_box; /* And_box where the variable has suspended */
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struct SUSPENSIONS_VAR *next; /* Pointer to the next suspention */
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};
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struct PERM_VAR {
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Cell value; /* value assigned to the variable */
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struct AND_BOX *home; /* pointer to the goal_box structure of the variable */
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Cell *yapvar;
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struct SUSPENSIONS_VAR *suspensions; /* Pointer to a Suspension List */
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struct PERM_VAR *next;
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};
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struct EXTERNAL_VAR { /* to be used as some kind of trail */
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Cell value; /* value assign to the variable */
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struct PERM_VAR *var; /* pointer to the local_var struct */
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struct EXTERNAL_VAR *next;
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};
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struct status_and {
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struct OR_BOX *call; /* POINTER TO A OR_BOX */
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Cell *locals; /* temporary vars vector */
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Cell *code; /* Pointer to the start code */
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int state; /* State of the OR_BOX */
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struct status_and *previous;
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struct status_and *next;
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};
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struct status_or {
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struct AND_BOX *alternative; /* POINTER TO A AND_BOX */
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Cell *args; /* Saved Arguments */
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Cell *code; /* Pointer to Start Code */
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int state; /* State of the AND_BOX */
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struct status_or *previous;
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struct status_or *next;
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};
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struct OR_BOX {
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struct AND_BOX *parent;
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struct status_and *nr_call; /* order of this box */
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short int nr_all_alternatives; /* number of existing alternatives */
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struct status_or *alternatives; /* alternatives of the or_box */
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short int eager_split;
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};
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struct AND_BOX {
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struct OR_BOX *parent; /* pointer to the parent or-box */
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struct status_or *nr_alternative; /* This box is alternative id */
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short int nr_all_calls; /* numger of all goals */
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struct PERM_VAR *perms;
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struct status_and *calls;
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short int level; /* indicates the level in the tree */
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struct EXTERNAL_VAR *externals; /* pointer to a list of external_vars */
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struct SUSPENSIONS *suspended; /* pointer to a list of suspended boxes */
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short int side_effects; /* to mark if are calls to builtins with side_efects (like write) */
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};
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/* TYPE OF STATES */
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#define ZERO 0 /* No State yet */
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#define SUCCESS 1
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#define FAILS 2
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#define READY 4 /* Is ready to start execution */
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#define RUNNING 8 /* Is running */
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#define RUNAGAIN 16 /* Is running again */
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#define SUSPEND 32 /* Has suspended */
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#define WAKE 64 /* Was Suspended, but now is Ready again */
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#define CHANGED 128 /* Has received some change on it's external variables, needs to re-run */
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#define END 256 /* Has suspended on end, on wake up can pass to a success state */
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#define WAITING 512 /* The clause is waiting for the previous predicates to leave the Suspended state */
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#define FAILED 1024 /* has failed */
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#define CUT_RIGHT 2048
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#define SKIP_VAR 4096
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#define LEFTMOST_PARENT 8192
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#define FIRST 16384
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#define LEFTMOST 32768
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#define WAITING_TO_BE_FIRST (WAITING + FIRST)
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#define WAITING_TO_BE_LEFTMOST (WAITING + LEFTMOST)
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#define WAITING_TO_BE_LEFTMOST_PARENT (WAITING + LEFTMOST_PARENT)
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#define WAITING_TO_CUT (WAITING + CUT_RIGHT)
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#define WAITING_SKIP_VAR (WAITING + SKIP_VAR)
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#define SUSPEND_END (SUSPEND+END)
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#define WAKE_END (WAKE+END)
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#define NORMAL_SUSPENSION 0
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#define LEFTMOST_SUSPENSION 1
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#define WAIT_SUSPENSION 2
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#define CUT_SUSPENSION 3
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#define WRITE_SUSPENSION 4
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#define VAR_SUSPENSION 5
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#define YAP_VAR_SUSPENSION 6
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/* TYPE OF SIDE_EFFECTS */
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#define WRITE 1
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#define COMMIT 2
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#define VAR 4
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#define SEQUENCIAL 8
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#define CUT 32 /* Greater than 32 always cut */
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