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yap-6.3/C/compiler.c

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: compiler.c *
* comments: Clause compiler *
* *
* Last rev: $Date: 2004-03-08 19:31:01 $,$Author: vsc $ *
* $Log: not supported by cvs2svn $ *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif /* SCCS */
#include "Yap.h"
#include "compile.h"
#include "clause.h"
#include "yapio.h"
#if HAVE_STRING_H
#include <string.h>
#endif
typedef struct branch_descriptor {
int id; /* the branch id */
Term cm; /* if a banch is associated with a commit */
} branch;
typedef struct compiler_struct_struct {
branch parent_branches[256];
branch *branch_pointer;
PInstr *BodyStart;
Ventry *vtable;
CExpEntry *common_exps;
int n_common_exps;
int goalno;
int onlast;
int onhead;
int onbranch;
int curbranch;
Prop current_p0;
#ifdef TABLING_INNER_CUTS
PInstr *cut_mark;
#endif /* TABLING_INNER_CUTS */
#ifdef DEBUG
int pbvars;
#endif /* DEBUG */
int nvars;
UInt labelno;
int or_found;
UInt max_args;
int MaxCTemps;
UInt tmpreg;
Int vreg;
Int vadr;
Int *Uses;
Term *Contents;
CIntermediates cint;
} compiler_struct;
STATIC_PROTO(int active_branch, (int, int));
STATIC_PROTO(void c_var, (Term, Int, unsigned int, unsigned int, compiler_struct *));
STATIC_PROTO(void reset_vars, (Ventry *));
STATIC_PROTO(Term optimize_ce, (Term, unsigned int, unsigned int, compiler_struct *));
STATIC_PROTO(void c_arg, (Int, Term, unsigned int, unsigned int, compiler_struct *));
STATIC_PROTO(void c_args, (Term, unsigned int, compiler_struct *));
STATIC_PROTO(void c_eq, (Term, Term, compiler_struct *));
STATIC_PROTO(void c_test, (Int, Term, compiler_struct *));
STATIC_PROTO(void c_bifun, (Int, Term, Term, Term, int, compiler_struct *));
STATIC_PROTO(void c_goal, (Term, int, compiler_struct *));
STATIC_PROTO(void c_body, (Term, int, compiler_struct *));
STATIC_PROTO(void c_head, (Term, compiler_struct *));
STATIC_PROTO(int usesvar, (compiler_vm_op));
STATIC_PROTO(CELL *init_bvarray, (int, compiler_struct *));
#ifdef DEBUG
STATIC_PROTO(void clear_bvarray, (int, CELL *, compiler_struct *));
#else
STATIC_PROTO(void clear_bvarray, (int, CELL *));
#endif
STATIC_PROTO(void add_bvarray_op, (PInstr *,CELL *, int, compiler_struct *));
STATIC_PROTO(void AssignPerm, (PInstr *, compiler_struct *));
STATIC_PROTO(void CheckUnsafe, (PInstr *, compiler_struct *));
STATIC_PROTO(void CheckVoids, (compiler_struct *));
STATIC_PROTO( int checktemp, (Int, Int, compiler_vm_op, compiler_struct *));
STATIC_PROTO( Int checkreg, (Int, Int, compiler_vm_op, int, compiler_struct *));
STATIC_PROTO(void c_layout, (compiler_struct *));
STATIC_PROTO(void c_optimize, (PInstr *));
#ifdef SFUNC
STATIC_PROTO(void compile_sf_term, (Term, int));
#endif
static void
push_branch(int id, Term cmvar, compiler_struct *cglobs) {
cglobs->branch_pointer->id = id;
cglobs->branch_pointer->cm = cmvar;
cglobs->branch_pointer++;
}
static int
pop_branch(compiler_struct *cglobs) {
cglobs->branch_pointer--;
return(cglobs->branch_pointer->id);
}
#ifdef TABLING
#define is_tabled(pe) (pe->PredFlags & TabledPredFlag)
#endif /* TABLING */
static inline int
active_branch(int i, int onbranch)
{
/* register int *bp;*/
return (i == onbranch);
/* bp = cglobs->branch_pointer;
while (bp > parent_branches) {
if (*--bp == onbranch)
return (TRUE);
}
return(i==onbranch);*/
}
#define FAIL(M,T,E) { Yap_ErrorMessage=M; Yap_Error_TYPE = T; Yap_Error_Term = E; return; }
#define IsNewVar(v) (Addr(v)<cglobs->cint.freep0 || Addr(v)>cglobs->cint.freep)
inline static void pop_code(unsigned int, compiler_struct *);
inline static void
pop_code(unsigned int level, compiler_struct *cglobs)
{
if (level == 0)
return;
if (cglobs->cint.cpc->op == pop_op)
++(cglobs->cint.cpc->rnd1);
else {
Yap_emit(pop_op, One, Zero, &cglobs->cint);
}
}
static void
adjust_current_commits(compiler_struct *cglobs) {
branch *bp = cglobs->branch_pointer;
while (bp > cglobs->parent_branches) {
bp--;
if (bp->cm != TermNil) {
c_var(bp->cm, patch_b_flag, 1, 0, cglobs);
}
}
}
static void
c_var(Term t, Int argno, unsigned int arity, unsigned int level, compiler_struct *cglobs)
{
int flags, new = FALSE;
Ventry *v = (Ventry *) Deref(t);
if (IsNewVar(v)) { /* new var */
v = (Ventry *) Yap_AllocCMem(sizeof(*v), &cglobs->cint);
#if SBA
v->SelfOfVE = 0;
#else
v->SelfOfVE = (CELL) v;
#endif
v->AdrsOfVE = t;
*CellPtr(t) = (CELL) v;
v->KindOfVE = v->NoOfVE = Unassigned;
flags = 0;
/* Be careful with eithers. I may make a variable global in a branch,
and not in another.
a :- (b([X]) ; c), go(X).
This variaiable will not be globalised if we are coming from
the second branch.
I also need to protect the onhead because Luis uses that to
optimise unification in the body of a clause, eg
a :- (X = 2 ; c), go(X).
And, yes, there is code like this...
*/
if (((level > 0 || cglobs->onhead) && cglobs->curbranch == 0)
|| argno == save_pair_flag ||
argno == save_appl_flag)
flags |= SafeVar;
if ((level > 0 && cglobs->curbranch == 0) || argno == save_pair_flag ||
argno == save_appl_flag)
flags |= GlobalVal;
v->FlagsOfVE = flags;
v->BranchOfVE = cglobs->onbranch;
v->NextOfVE = cglobs->vtable;
v->RCountOfVE = 0;
v->AgeOfVE = v->FirstOfVE = cglobs->goalno;
new = TRUE;
cglobs->vtable = v;
} else {
v->FlagsOfVE |= NonVoid;
if (v->BranchOfVE > 0) {
if (!active_branch(v->BranchOfVE, cglobs->onbranch)) {
v->AgeOfVE = v->FirstOfVE = 1;
new = FALSE;
v->FlagsOfVE |= BranchVar;
/* set the original instruction correctly */
switch (v->FirstOpForV->op) {
case get_var_op:
v->FirstOpForV->op = get_val_op;
break;
case unify_var_op:
v->FirstOpForV->op = unify_val_op;
break;
case unify_last_var_op:
v->FirstOpForV->op = unify_last_val_op;
break;
case put_var_op:
v->FirstOpForV->op = put_val_op;
break;
case write_var_op:
v->FirstOpForV->op = write_val_op;
break;
default:
break;
}
}
}
}
if (cglobs->onhead)
v->FlagsOfVE |= OnHeadFlag;
switch (argno) {
case save_b_flag:
Yap_emit(save_b_op, (CELL) v, Zero, &cglobs->cint);
break;
case commit_b_flag:
Yap_emit(commit_b_op, (CELL) v, Zero, &cglobs->cint);
Yap_emit(empty_call_op, Zero, Zero, &cglobs->cint);
Yap_emit(restore_tmps_and_skip_op, Zero, Zero, &cglobs->cint);
break;
case patch_b_flag:
Yap_emit(patch_b_op, (CELL) v, 0, &cglobs->cint);
break;
case save_pair_flag:
Yap_emit(save_pair_op, (CELL) v, 0, &cglobs->cint);
break;
case save_appl_flag:
Yap_emit(save_appl_op, (CELL) v, 0, &cglobs->cint);
break;
case f_flag:
if (new) {
++cglobs->nvars;
Yap_emit(f_var_op, (CELL) v, (CELL)arity, &cglobs->cint);
} else
Yap_emit(f_val_op, (CELL) v, (CELL)arity, &cglobs->cint);
break;
case bt1_flag:
Yap_emit(fetch_args_for_bccall, (CELL)v, 0, &cglobs->cint);
break;
case bt2_flag:
Yap_emit(bccall_op, (CELL)v, (CELL)cglobs->current_p0, &cglobs->cint);
break;
default:
#ifdef SFUNC
if (argno < 0) {
if (new)
Yap_emit((cglobs->onhead ? unify_s_var_op : write_s_var_op), v, -argno, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? unify_s_val_op : write_s_val_op), v, -argno, &cglobs->cint);
} else
#endif
if (cglobs->onhead) {
if (level == 0)
Yap_emit((new ? (++cglobs->nvars, get_var_op) : get_val_op), (CELL) v, argno, &cglobs->cint);
else
Yap_emit((new ? (++cglobs->nvars, (argno == (Int)arity ?
unify_last_var_op :
unify_var_op)) :
(argno == (Int)arity ? unify_last_val_op :
unify_val_op)),
(CELL) v, Zero, &cglobs->cint);
}
else {
if (level == 0)
Yap_emit((new ? (++cglobs->nvars, put_var_op) : put_val_op), (CELL) v, argno, &cglobs->cint);
else
Yap_emit((new ? (++cglobs->nvars, write_var_op) : write_val_op), (CELL) v, Zero, &cglobs->cint);
}
}
if (new) {
v->FirstOpForV = cglobs->cint.cpc;
}
++(v->RCountOfVE);
if (cglobs->onlast)
v->FlagsOfVE |= OnLastGoal;
if (v->AgeOfVE < cglobs->goalno)
v->AgeOfVE = cglobs->goalno;
}
static void
reset_vars(Ventry *vtable)
{
Ventry *v = vtable;
CELL *t;
while (v != NIL) {
t = (CELL *) v->AdrsOfVE;
RESET_VARIABLE(t);
v = v->NextOfVE;
}
}
static Term
optimize_ce(Term t, unsigned int arity, unsigned int level, compiler_struct *cglobs)
{
CExpEntry *p = cglobs->common_exps, *parent = cglobs->common_exps;
int cmp = 0;
if (IsApplTerm(t) && IsExtensionFunctor(FunctorOfTerm(t)))
return (t);
while (p != NULL) {
CELL *OldH = H;
H = (CELL *)cglobs->cint.freep;
cmp = Yap_compare_terms(t, (p->TermOfCE));
H = OldH;
if (cmp > 0) {
parent = p;
p = p->RightCE;
}
else if (cmp < 0) {
parent = p;
p = p->LeftCE;
}
else
break;
}
if (p != NULL) { /* already there */
return (p->VarOfCE);
}
/* first occurrence */
if (cglobs->onbranch)
return (t);
++(cglobs->n_common_exps);
p = (CExpEntry *) Yap_AllocCMem(sizeof(CExpEntry), &cglobs->cint);
p->TermOfCE = t;
p->VarOfCE = MkVarTerm();
if (H >= (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
p->RightCE = NULL;
p->LeftCE = NULL;
if (parent == NULL)
cglobs->common_exps = p;
else if (cmp > 0)
parent->RightCE = p;
else /* if (cmp < 0) */
parent->LeftCE = p;
if (IsApplTerm(t))
c_var(p->VarOfCE, save_appl_flag, arity, level, cglobs);
else if (IsPairTerm(t))
c_var(p->VarOfCE, save_pair_flag, arity, level, cglobs);
return (t);
}
#ifdef SFUNC
static void
compile_sf_term(Term t, int argno, int level)
{
Functor f = FunctorOfTerm(t);
CELL *p = ArgsOfSFTerm(t) - 1;
SFEntry *pe = RepSFProp(Yap_GetAProp(NameOfFunctor(f), SFProperty));
Term nullvalue = pe->NilValue;
if (level == 0)
Yap_emit((cglobs->onhead ? get_s_f_op : put_s_f_op), f, argno, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? unify_s_f_op : write_s_f_op), f, Zero, &cglobs->cint);
++level;
while ((argno = *++p)) {
t = Derefa(++p);
if (t != nullvalue) {
if (IsAtomicTerm(t))
Yap_emit((cglobs->onhead ? unify_s_a_op : write_s_a_op), t, (CELL) argno, &cglobs->cint);
else if (!IsVarTerm(t)) {
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = TermNil;
Yap_ErrorMessage = "illegal argument of soft functor";
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 2);
}
else
c_var(t, -argno, arity, level, cglobs);
}
}
--level;
if (level == 0)
Yap_emit((cglobs->onhead ? get_s_end_op : put_s_end_op), Zero, Zero, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? unify_s_end_op : write_s_end_op), Zero, Zero, &cglobs->cint);
}
#endif
inline static void
c_args(Term app, unsigned int level, compiler_struct *cglobs)
{
Functor f = FunctorOfTerm(app);
unsigned int Arity = ArityOfFunctor(f);
unsigned int i;
if (level == 0) {
if (Arity >= MaxTemps) {
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = TermNil;
Yap_ErrorMessage = "exceed maximum arity of compiled goal";
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 2);
}
if (Arity > cglobs->max_args)
cglobs->max_args = Arity;
}
for (i = 1; i <= Arity; ++i)
c_arg(i, ArgOfTerm(i, app), Arity, level, cglobs);
}
static void
c_arg(Int argno, Term t, unsigned int arity, unsigned int level, compiler_struct *cglobs)
{
restart:
if (IsVarTerm(t))
c_var(t, argno, arity, level, cglobs);
else if (IsAtomTerm(t)) {
if (level == 0)
Yap_emit((cglobs->onhead ? get_atom_op : put_atom_op), (CELL) t, argno, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? (argno == (Int)arity ? unify_last_atom_op
: unify_atom_op) :
write_atom_op), (CELL) t, Zero, &cglobs->cint);
}
else if (IsIntegerTerm(t) || IsFloatTerm(t) || IsBigIntTerm(t)) {
if (!IsIntTerm(t)) {
/* we are taking a blob, that is a binary that is supposed to be
guarded in the clause itself. Possible examples include
floats, long ints, bignums, bitmaps.... */
CELL l1 = ++cglobs->labelno;
CELL *src = RepAppl(t);
PInstr *ocpc = cglobs->cint.cpc, *OCodeStart = cglobs->cint.CodeStart;
/* use a special list to store the blobs */
cglobs->cint.cpc = cglobs->cint.icpc;
/* if (IsFloatTerm(t)) {
Yap_emit(align_float_op, Zero, Zero, &cglobs->cint);
}*/
Yap_emit(label_op, l1, Zero, &cglobs->cint);
if (IsFloatTerm(t)) {
/* let us do floats first */
CELL *dest =
Yap_emit_extra_size(blob_op,
(CELL)(SIZEOF_DOUBLE/SIZEOF_LONG_INT+1),
(1+SIZEOF_DOUBLE/SIZEOF_LONG_INT)*CellSize, &cglobs->cint);
/* copy the float bit by bit */
dest[0] = src[0];
dest[1] = src[1];
#if SIZEOF_DOUBLE == 2*SIZEOF_LONG_INT
dest[2] = src[2];
#endif
/* note that we don't need to copy size info, unless we wanted
to garbage collect clauses ;-) */
cglobs->cint.icpc = cglobs->cint.cpc;
if (cglobs->cint.BlobsStart == NULL)
cglobs->cint.BlobsStart = cglobs->cint.CodeStart;
cglobs->cint.cpc = ocpc;
cglobs->cint.CodeStart = OCodeStart;
/* The argument to pass to the structure is now the label for
where we are storing the blob */
if (level == 0)
Yap_emit((cglobs->onhead ? get_float_op : put_float_op), l1, argno, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? (argno == (Int)arity ? unify_last_float_op
: unify_float_op) :
write_float_op), l1, Zero, &cglobs->cint);
#if USE_GMP
} else if (IsBigIntTerm(t)) {
/* next, let us do bigints */
Int sz = sizeof(CELL)+
sizeof(MP_INT)+
((((MP_INT *)(RepAppl(t)+1))->_mp_alloc)*sizeof(mp_limb_t));
CELL *dest =
Yap_emit_extra_size(blob_op, sz/CellSize, sz, &cglobs->cint);
/* copy the bignum */
memcpy(dest, src, sz);
/* note that we don't need to copy size info, unless we wanted
to garbage collect clauses ;-) */
cglobs->cint.icpc = cglobs->cint.cpc;
if (cglobs->cint.BlobsStart == NULL)
cglobs->cint.BlobsStart = cglobs->cint.CodeStart;
cglobs->cint.cpc = ocpc;
cglobs->cint.CodeStart = OCodeStart;
/* The argument to pass to the structure is now the label for
where we are storing the blob */
if (level == 0)
Yap_emit((cglobs->onhead ? get_bigint_op : put_bigint_op), l1, argno, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? (argno == (Int)arity ? unify_last_bigint_op
: unify_bigint_op) :
write_bigint_op), l1, Zero, &cglobs->cint);
#endif
} else {
/* for now, it's just a long int */
CELL *dest =
Yap_emit_extra_size(blob_op,
2,
2*CellSize, &cglobs->cint);
/* copy the long int in one fell swoop */
dest[0] = src[0];
dest[1] = src[1];
cglobs->cint.icpc = cglobs->cint.cpc;
if (cglobs->cint.BlobsStart == NULL)
cglobs->cint.BlobsStart = cglobs->cint.CodeStart;
cglobs->cint.cpc = ocpc;
cglobs->cint.CodeStart = OCodeStart;
if (level == 0)
Yap_emit((cglobs->onhead ? get_longint_op : put_longint_op), l1, argno, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? (argno == (Int)arity ? unify_last_longint_op
: unify_longint_op) :
write_longint_op), l1, Zero, &cglobs->cint);
}
/* That's it folks! */
return;
}
if (level == 0)
Yap_emit((cglobs->onhead ? get_num_op : put_num_op), (CELL) t, argno, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? (argno == (Int)arity ? unify_last_num_op
: unify_num_op) :
write_num_op), (CELL) t, Zero, &cglobs->cint);
}
else if (IsPairTerm(t)) {
if (optimizer_on && (!cglobs->onhead || argno != 1 || level > 1) && level < 6) {
t = optimize_ce(t, arity, level, cglobs);
if (IsVarTerm(t)) {
c_var(t, argno, arity, level, cglobs);
return;
}
}
if (level == 0)
Yap_emit((cglobs->onhead ? get_list_op : put_list_op), Zero, argno, &cglobs->cint);
else if (argno == (Int)arity)
Yap_emit((cglobs->onhead ? unify_last_list_op : write_last_list_op), Zero, Zero, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? unify_list_op : write_list_op), Zero, Zero, &cglobs->cint);
++level;
c_arg(1, HeadOfTerm(t), 2, level, cglobs);
if (argno == (Int)arity) {
/* optimise for tail recursion */
t = TailOfTerm(t);
goto restart;
}
c_arg(2, TailOfTerm(t), 2, level, cglobs);
--level;
if (argno != (Int)arity) {
pop_code(level, cglobs);
}
} else if (IsRefTerm(t)) {
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (!(cglobs->cint.CurrentPred->PredFlags & (DynamicPredFlag|LogUpdatePredFlag))) {
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
FAIL("can not compile data base reference",TYPE_ERROR_CALLABLE,t);
} else {
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
Yap_emit((cglobs->onhead ? get_atom_op : put_atom_op), (CELL) t, argno, &cglobs->cint);
}
} else {
#ifdef SFUNC
if (SFTerm(t)) {
compile_sf_term(t, argno);
return;
}
#endif
if (optimizer_on && (!cglobs->onhead || argno != 1 || level > 1)) {
t = optimize_ce(t, arity, level, cglobs);
if (IsVarTerm(t)) {
c_var(t, argno, arity, level, cglobs);
return;
}
}
if (level == 0)
Yap_emit((cglobs->onhead ? get_struct_op : put_struct_op),
(CELL) FunctorOfTerm(t), argno, &cglobs->cint);
else if (argno == (Int)arity)
Yap_emit((cglobs->onhead ? unify_last_struct_op : write_last_struct_op),
(CELL) FunctorOfTerm(t), Zero, &cglobs->cint);
else
Yap_emit((cglobs->onhead ? unify_struct_op : write_struct_op),
(CELL) FunctorOfTerm(t), Zero, &cglobs->cint);
++level;
c_args(t, level, cglobs);
--level;
if (argno != (Int)arity) {
pop_code(level, cglobs);
}
}
}
static void
c_eq(Term t1, Term t2, compiler_struct *cglobs)
{
Term t;
--cglobs->tmpreg;
if (IsVarTerm(t2))
t = t2, t2 = t1, t1 = t;
if (IsVarTerm(t1)) {
if (IsVarTerm(t2)) { /* both are variables */
if (IsNewVar(t2))
t = t2, t2 = t1, t1 = t;
c_var(t2, cglobs->tmpreg, 2, 0, cglobs);
cglobs->onhead = 1;
c_var(t1, cglobs->tmpreg, 2, 0, cglobs);
cglobs->onhead = 0;
}
else if (IsNewVar(t1)) {
c_arg(cglobs->tmpreg, t2, 0, 0, cglobs);
cglobs->onhead = 1;
c_var(t1, cglobs->tmpreg, 2, 0, cglobs);
cglobs->onhead = 0;
}
else { /* t2 is non var */
c_var(t1, cglobs->tmpreg, 2, 0, cglobs);
cglobs->onhead = 1;
c_arg(cglobs->tmpreg, t2, 0, 0, cglobs);
cglobs->onhead = 0;
}
}
else {
c_arg(cglobs->tmpreg, t1, 0, 0, cglobs);
cglobs->onhead = 1;
c_arg(cglobs->tmpreg, t2, 0, 0, cglobs);
cglobs->onhead = 0;
}
}
static void
c_test(Int Op, Term t1, compiler_struct *cglobs) {
Term t = Deref(t1);
if (!IsVarTerm(t)) {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_VARIABLE;
Yap_Error_Term = t;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "when compiling %s/1", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 1);
}
if (IsNewVar(t)) {
/* in this case, var trivially succeeds and the others trivially fail */
if (Op != _var)
Yap_emit(fail_op, Zero, Zero, &cglobs->cint);
} else {
c_var(t,f_flag,(unsigned int)Op, 0, cglobs);
}
}
/* Arithmetic builtins will be compiled in the form:
fetch_args_vv Xi,Xj
put_val Xi,Ri
put_val Xj,Rj
put_var Xk,Ak
bip_body Op,Xk
The put_var should always be disposable, and the put_vals can be disposed of if R is an X.
This, in the best case, Ri and Rj are WAM temp registers and this will reduce to:
bip Op,Ak,Ri,Rj
meaning a single WAM op will call the clause.
If one of the arguments is a constant, the result will be:
fetch_args_vc Xi,C
put_val Xi,Ri
put_var Xk,Ak
bip_body Op,Xk
and this should reduce to :
bip_cons Op,Xk,Ri,C
*/
static void
c_bifun(Int Op, Term t1, Term t2, Term t3, int mod, compiler_struct *cglobs)
{
/* compile Z = X Op Y arithmetic function */
/* first we fetch the arguments */
if (IsVarTerm(t1)) {
if (IsNewVar(t1)) {
char s[32];
Yap_Error_TYPE = INSTANTIATION_ERROR;
Yap_Error_Term = t1;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "when compiling %s/2", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 1);
} else if (IsVarTerm(t2)) {
if (IsNewVar(t2)) {
char s[32];
Yap_Error_TYPE = INSTANTIATION_ERROR;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "when compiling %s/2", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 1);
} else {
/* first temp */
Int v1 = --cglobs->tmpreg;
/* second temp */
Int v2 = --cglobs->tmpreg;
Yap_emit(fetch_args_vv_op, Zero, Zero, &cglobs->cint);
/* these should be the arguments */
c_var(t1, v1, 0, 0, cglobs);
c_var(t2, v2, 0, 0, cglobs);
/* now we know where the arguments are */
}
} else {
if (Op == _arg) {
Term tn = MkVarTerm();
Int v1 = --cglobs->tmpreg;
Int v2 = --cglobs->tmpreg;
c_arg(t2, v2, 0, 0, cglobs);
Yap_emit(fetch_args_vv_op, Zero, Zero, &cglobs->cint);
/* these should be the arguments */
c_var(t1, v1, 0, 0, cglobs);
c_var(tn, v2, 0, 0, cglobs);
/* it has to be either an integer or a floating point */
} else if (IsIntTerm(t2)) {
/* first temp */
Int v1 = --cglobs->tmpreg;
Yap_emit(fetch_args_vc_op, (CELL)IntOfTerm(t2), Zero, &cglobs->cint);
/* these should be the arguments */
c_var(t1, v1, 0, 0, cglobs);
/* now we know where the arguments are */
} else if (IsLongIntTerm(t2)) {
/* first temp */
Int v1 = --cglobs->tmpreg;
Yap_emit(fetch_args_vc_op, (CELL)LongIntOfTerm(t2), Zero, &cglobs->cint);
/* these should be the arguments */
c_var(t1, v1, 0, 0, cglobs);
/* now we know where the arguments are */
} else {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_NUMBER;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling %s/2 with output bound", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
}
} else { /* t1 is bound */
/* it has to be either an integer or a floating point */
if (IsVarTerm(t2)) {
if (IsNewVar(t2)) {
char s[32];
Yap_Error_TYPE = INSTANTIATION_ERROR;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling functor/3");
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
} else {
if (Op == _functor) {
/* both arguments are bound, we must perform unification */
Int i2;
if (!IsIntegerTerm(t2)) {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_INTEGER;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling functor/3");
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
i2 = IntegerOfTerm(t2);
if (i2 < 0) {
char s[32];
Yap_Error_TYPE = DOMAIN_ERROR_NOT_LESS_THAN_ZERO;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling functor/3");
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
if (IsNumTerm(t1)) {
/* we will always fail */
if (i2)
c_goal(MkAtomTerm(AtomFalse), mod, cglobs);
} else if (!IsAtomTerm(t1)) {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_ATOM;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling functor/3");
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
if (i2 == 0)
c_eq(t1, t3, cglobs);
else {
CELL *hi = H;
Int i;
if (t1 == TermDot && i2 == 2) {
if (H+2 >= (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
RESET_VARIABLE(H);
RESET_VARIABLE(H+1);
H += 2;
c_eq(AbsPair(H-2),t3, cglobs);
} else {
*H++ = (CELL)Yap_MkFunctor(AtomOfTerm(t1),i2);
for (i=0; i < i2; i++) {
if (H >= (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
RESET_VARIABLE(H);
H++;
}
c_eq(AbsAppl(hi),t3, cglobs);
}
}
} else if (Op == _arg) {
Int i1;
if (IsIntegerTerm(t1))
i1 = IntegerOfTerm(t1);
else {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_INTEGER;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling %s/2", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
if (IsAtomicTerm(t2) ||
(IsApplTerm(t2) && IsExtensionFunctor(FunctorOfTerm(t2)))) {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_COMPOUND;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling %s/2", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
} else if (IsApplTerm(t2)) {
Functor f = FunctorOfTerm(t2);
if (i1 < 1 || i1 > ArityOfFunctor(f)) {
c_goal(MkAtomTerm(AtomFalse), mod, cglobs);
} else {
c_eq(ArgOfTerm(i1, t2), t3, cglobs);
}
return;
} else if (IsPairTerm(t2)) {
switch (i1) {
case 1:
c_eq(HeadOfTerm(t2), t3, cglobs);
return;
case 2:
c_eq(TailOfTerm(t2), t3, cglobs);
return;
default:
c_goal(MkAtomTerm(AtomFalse), mod, cglobs);
return;
}
}
} else {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_INTEGER;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling %s/2", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
}
if (Op == _functor) {
if (!IsAtomicTerm(t1)) {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_ATOM;
Yap_Error_Term = t1;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling %s/2", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
} else {
if (!IsVarTerm(t2)) {
Int arity;
/* We actually have the term ready, so let's just do the unification now */
if (!IsIntegerTerm(t2)) {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_INTEGER;
Yap_Error_Term = t2;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling %s/2", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
arity = IntOfTerm(t2);
if (arity < 0) {
/* fail straight away */
Yap_emit(fail_op, Zero, Zero, &cglobs->cint);
}
if (arity) {
Term tnew;
if (!IsAtomTerm(t1)) {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_ATOM;
Yap_Error_Term = t1;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling %s/2", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
if (H+1+arity >= (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
tnew = AbsAppl(H);
*H++ = (CELL)Yap_MkFunctor(AtomOfTerm(t1),arity);
while (arity--) {
RESET_VARIABLE(H);
H++;
}
c_eq(tnew, t3, cglobs);
} else {
/* just unify the two arguments */
c_eq(t1,t3, cglobs);
}
return;
} else {
/* first temp */
Int v1 = --cglobs->tmpreg;
Yap_emit(fetch_args_cv_op, t1, Zero, &cglobs->cint);
/* these should be the arguments */
c_var(t2, v1, 0, 0, cglobs);
/* now we know where the arguments are */
}
}
} else if (IsIntTerm(t1)) {
/* first temp */
Int v1 = --cglobs->tmpreg;
Yap_emit(fetch_args_cv_op, (CELL)IntOfTerm(t1), Zero, &cglobs->cint);
/* these should be the arguments */
c_var(t2, v1, 0, 0, cglobs);
/* now we know where the arguments are */
} else if (IsLongIntTerm(t1)) {
/* first temp */
Int v1 = --cglobs->tmpreg;
Yap_emit(fetch_args_cv_op, (CELL)LongIntOfTerm(t1), Zero, &cglobs->cint);
/* these should be the arguments */
c_var(t2, v1, 0, 0, cglobs);
/* now we know where the arguments are */
} else {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_VARIABLE;
Yap_Error_Term = t1;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling %s/2 with output bound", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
}
/* then we compile the opcode/result */
if (!IsVarTerm(t3)) {
if (Op == _arg) {
Term tmpvar = MkVarTerm();
if (H == (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
c_var(tmpvar,f_flag,(unsigned int)Op, 0, cglobs);
c_eq(tmpvar,t3, cglobs);
} else {
char s[32];
Yap_Error_TYPE = TYPE_ERROR_VARIABLE;
Yap_Error_Term = t3;
Yap_ErrorMessage = Yap_ErrorSay;
Yap_bip_name(Op, s);
sprintf(Yap_ErrorMessage, "compiling %s/2 with input unbound", s);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
} else if (IsNewVar(t3) && cglobs->curbranch == 0 /* otherwise you may have trouble with z(X) :- ( Z is X*2 ; write(Z)) */) {
c_var(t3,f_flag,(unsigned int)Op, 0, cglobs);
if (Op == _functor) {
Yap_emit(empty_call_op, Zero, Zero, &cglobs->cint);
Yap_emit(restore_tmps_and_skip_op, Zero, Zero, &cglobs->cint);
}
} else {
/* generate code for a temp and then unify temp with previous variable */
Term tmpvar = MkVarTerm();
if (H == (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
c_var(tmpvar,f_flag,(unsigned int)Op, 0, cglobs);
/* I have to dit here, before I do the unification */
if (Op == _functor) {
Yap_emit(empty_call_op, Zero, Zero, &cglobs->cint);
Yap_emit(restore_tmps_and_skip_op, Zero, Zero, &cglobs->cint);
}
c_eq(tmpvar,t3, cglobs);
}
}
static void
c_functor(Term Goal, int mod, compiler_struct *cglobs)
{
Term t1 = ArgOfTerm(1, Goal);
Term t2 = ArgOfTerm(2, Goal);
Term t3 = ArgOfTerm(3, Goal);
if (IsVarTerm(t1) && IsNewVar(t1)) {
c_bifun(_functor, t2, t3, t1, mod, cglobs);
} else if (IsNonVarTerm(t1)) {
/* just split the structure */
if (IsAtomicTerm(t1)) {
c_eq(t1,t2, cglobs);
c_eq(t3,MkIntTerm(0), cglobs);
} else if (IsApplTerm(t1)) {
Functor f = FunctorOfTerm(t1);
c_eq(t2,MkAtomTerm(NameOfFunctor(f)), cglobs);
c_eq(t3,MkIntegerTerm(ArityOfFunctor(f)), cglobs);
} else /* list */ {
c_eq(t2,TermDot, cglobs);
c_eq(t3,MkIntTerm(2), cglobs);
}
} else if (IsVarTerm(t2) && IsNewVar(t2) &&
IsVarTerm(t3) && IsNewVar(t3)) {
Int v1 = --cglobs->tmpreg;
Yap_emit(fetch_args_vc_op, Zero, Zero, &cglobs->cint);
c_var(t1, v1, 0, 0, cglobs);
c_var(t2,f_flag,(unsigned int)_functor, 0, cglobs);
c_var(t3,f_flag,(unsigned int)_functor, 0, cglobs);
} else {
Functor f = FunctorOfTerm(Goal);
Prop p0 = PredPropByFunc(f, mod);
if (profiling)
Yap_emit(enter_profiling_op, (CELL)RepPredProp(p0), Zero, &cglobs->cint);
else if (call_counting)
Yap_emit(count_call_op, (CELL)RepPredProp(p0), Zero, &cglobs->cint);
c_args(Goal, 0, cglobs);
Yap_emit(safe_call_op, (CELL)p0 , Zero, &cglobs->cint);
Yap_emit(empty_call_op, Zero, Zero, &cglobs->cint);
Yap_emit(restore_tmps_and_skip_op, Zero, Zero, &cglobs->cint);
}
}
static int
IsTrueGoal(Term t) {
if (IsVarTerm(t)) return(FALSE);
if (IsApplTerm(t)) {
Functor f = FunctorOfTerm(t);
if (f == FunctorModule) {
return(IsTrueGoal(ArgOfTerm(2,t)));
}
if (f == FunctorComma || f == FunctorOr || f == FunctorArrow) {
return(IsTrueGoal(ArgOfTerm(1,t)) && IsTrueGoal(ArgOfTerm(2,t)));
}
return(FALSE);
}
return(t == MkAtomTerm(AtomTrue));
}
static void
c_goal(Term Goal, int mod, compiler_struct *cglobs)
{
Functor f;
PredEntry *p;
Prop p0;
if (IsVarTerm(Goal)) {
Goal = Yap_MkApplTerm(FunctorCall, 1, &Goal);
}
if (IsApplTerm(Goal) && FunctorOfTerm(Goal) == FunctorModule) {
Term M = ArgOfTerm(1, Goal);
if (IsVarTerm(M) || !IsAtomTerm(M)) {
if (IsVarTerm(M)) {
Yap_Error_TYPE = INSTANTIATION_ERROR;
} else {
Yap_Error_TYPE = TYPE_ERROR_ATOM;
}
Yap_Error_Term = M;
Yap_ErrorMessage = "in module name";
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 1);
}
Goal = ArgOfTerm(2, Goal);
mod = M;
}
if (IsVarTerm(Goal)) {
Goal = Yap_MkApplTerm(FunctorCall, 1, &Goal);
} else if (IsNumTerm(Goal)) {
FAIL("goal can not be a number", TYPE_ERROR_CALLABLE, Goal);
} else if (IsRefTerm(Goal)) {
Yap_Error_TYPE = TYPE_ERROR_DBREF;
Yap_Error_Term = Goal;
FAIL("goal argument in static procedure can not be a data base reference", TYPE_ERROR_CALLABLE, Goal);
}
else if (IsPairTerm(Goal)) {
Goal = Yap_MkApplTerm(FunctorCall, 1, &Goal);
}
if (IsAtomTerm(Goal)) {
Atom atom = AtomOfTerm(Goal);
if (atom == AtomFail || atom == AtomFalse) {
Yap_emit(fail_op, Zero, Zero, &cglobs->cint);
return;
}
else if (atom == AtomTrue || atom == AtomOtherwise) {
if (cglobs->onlast) {
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
if (is_tabled(cglobs->cint.CurrentPred))
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
else
#endif /* TABLING */
Yap_emit(procceed_op, Zero, Zero, &cglobs->cint);
}
return;
}
else if (atom == AtomCut) {
if (profiling)
Yap_emit(enter_profiling_op, (CELL)RepPredProp(PredPropByAtom(AtomCut,0)), Zero, &cglobs->cint);
else if (call_counting)
Yap_emit(count_call_op, (CELL)RepPredProp(PredPropByAtom(AtomCut,0)), Zero, &cglobs->cint);
if (cglobs->onlast) {
/* never a problem here with a -> b, !, c ; d */
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred)) {
Yap_emit_3ops(cut_op, Zero, Zero, Zero, &cglobs->cint);
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
}
else
#endif /* TABLING */
{
Yap_emit_3ops(cutexit_op, Zero, Zero, Zero, &cglobs->cint);
}
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
}
else {
Yap_emit_3ops(cut_op, Zero, Zero, Zero, &cglobs->cint);
/* needs to adjust previous commits */
adjust_current_commits(cglobs);
}
return;
}
#ifndef YAPOR
else if (atom == AtomRepeat) {
CELL l1 = ++cglobs->labelno;
CELL l2 = ++cglobs->labelno;
if (profiling)
Yap_emit(enter_profiling_op, (CELL)RepPredProp(PredPropByAtom(AtomRepeat,0)), Zero, &cglobs->cint);
else if (call_counting)
Yap_emit(count_call_op, (CELL)RepPredProp(PredPropByAtom(AtomRepeat,0)), Zero, &cglobs->cint);
cglobs->or_found = TRUE;
push_branch(cglobs->onbranch, TermNil, cglobs);
cglobs->curbranch++;
cglobs->onbranch = cglobs->curbranch;
if (cglobs->onlast)
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
Yap_emit_3ops(push_or_op, l1, Zero, Zero, &cglobs->cint);
Yap_emit_3ops(either_op, l1, Zero, Zero, &cglobs->cint);
Yap_emit(restore_tmps_op, Zero, Zero, &cglobs->cint);
Yap_emit(jump_op, l2, Zero, &cglobs->cint);
Yap_emit(label_op, l1, Zero, &cglobs->cint);
Yap_emit(pushpop_or_op, Zero, Zero, &cglobs->cint);
Yap_emit_3ops(orelse_op, l1, Zero, Zero, &cglobs->cint);
Yap_emit(label_op, l2, Zero, &cglobs->cint);
if (cglobs->onlast) {
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred))
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
else
#endif /* TABLING */
Yap_emit(procceed_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
}
else
++cglobs->goalno;
cglobs->onbranch = pop_branch(cglobs);
Yap_emit(pop_or_op, Zero, Zero, &cglobs->cint);
/* --cglobs->onbranch; */
return;
}
#endif /* YAPOR */
p = RepPredProp(p0 = Yap_PredPropByAtomNonThreadLocal(atom, mod));
/* if we are profiling, make sure we register we entered this predicate */
if (profiling)
Yap_emit(enter_profiling_op, (CELL)p, Zero, &cglobs->cint);
if (call_counting)
Yap_emit(count_call_op, (CELL)p, Zero, &cglobs->cint);
}
else {
f = FunctorOfTerm(Goal);
p = RepPredProp(p0 = Yap_PredPropByFunctorNonThreadLocal(f, mod));
if (f == FunctorOr) {
CELL l = ++cglobs->labelno;
CELL m = ++cglobs->labelno;
Term arg;
int save = cglobs->onlast;
int savegoalno = cglobs->goalno;
int frst = TRUE;
int commitflag = 0;
int looking_at_commit = FALSE;
int optimizing_commit = FALSE;
Term commitvar = 0;
PInstr *FirstP = cglobs->cint.cpc, *savecpc, *savencpc;
push_branch(cglobs->onbranch, TermNil, cglobs);
++cglobs->curbranch;
cglobs->onbranch = cglobs->curbranch;
cglobs->or_found = TRUE;
do {
arg = ArgOfTerm(1, Goal);
looking_at_commit = IsApplTerm(arg) &&
FunctorOfTerm(arg) == FunctorArrow;
if (frst) {
if (optimizing_commit) {
Yap_emit(label_op, l, Zero, &cglobs->cint);
l = ++cglobs->labelno;
}
Yap_emit_3ops(push_or_op, l, Zero, Zero, &cglobs->cint);
if (looking_at_commit &&
Yap_is_a_test_pred(ArgOfTerm(1, arg), mod)) {
/*
* let them think they are still the
* first
*/
Yap_emit(commit_opt_op, l, Zero, &cglobs->cint);
optimizing_commit = TRUE;
}
else {
optimizing_commit = FALSE;
Yap_emit_3ops(either_op, l, Zero, Zero, &cglobs->cint);
Yap_emit(restore_tmps_op, Zero, Zero, &cglobs->cint);
frst = FALSE;
}
}
else {
optimizing_commit = FALSE;
Yap_emit(label_op, l, Zero, &cglobs->cint);
Yap_emit(pushpop_or_op, Zero, Zero, &cglobs->cint);
Yap_emit_3ops(orelse_op, l = ++cglobs->labelno, Zero, Zero, &cglobs->cint);
}
/*
* if(IsApplTerm(arg) &&
* FunctorOfTerm(arg)==FunctorArrow) {
*/
if (looking_at_commit) {
if (!optimizing_commit && !commitflag) {
/* This instruction is placed before
* the disjunction. This means that
* the program counter must point
* correctly, and also that the age
* of variable is older than the
* current branch.
*/
int my_goalno = cglobs->goalno;
cglobs->goalno = savegoalno;
commitflag = cglobs->labelno;
commitvar = MkVarTerm();
if (H == (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
savecpc = cglobs->cint.cpc;
savencpc = FirstP->nextInst;
cglobs->cint.cpc = FirstP;
cglobs->onbranch = pop_branch(cglobs);
c_var(commitvar, save_b_flag, 1, 0, cglobs);
push_branch(cglobs->onbranch, commitvar, cglobs);
cglobs->onbranch = cglobs->curbranch;
cglobs->cint.cpc->nextInst = savencpc;
cglobs->cint.cpc = savecpc;
cglobs->goalno = my_goalno;
}
save = cglobs->onlast;
cglobs->onlast = FALSE;
c_goal(ArgOfTerm(1, arg), mod, cglobs);
if (!optimizing_commit) {
c_var((Term) commitvar, commit_b_flag,
1, 0, cglobs);
}
cglobs->onlast = save;
c_goal(ArgOfTerm(2, arg), mod, cglobs);
}
else
c_goal(ArgOfTerm(1, Goal), mod, cglobs);
if (!cglobs->onlast) {
Yap_emit(jump_op, m, Zero, &cglobs->cint);
}
cglobs->goalno = savegoalno + 1;
Goal = ArgOfTerm(2, Goal);
++cglobs->curbranch;
cglobs->onbranch = cglobs->curbranch;
} while (IsNonVarTerm(Goal) && IsApplTerm(Goal)
&& FunctorOfTerm(Goal) == FunctorOr);
Yap_emit(pushpop_or_op, Zero, Zero, &cglobs->cint);
Yap_emit(label_op, l, Zero, &cglobs->cint);
if (!optimizing_commit)
Yap_emit(orlast_op, Zero, Zero, &cglobs->cint);
else {
optimizing_commit = FALSE; /* not really necessary */
}
c_goal(Goal, mod, cglobs);
/* --cglobs->onbranch; */
cglobs->onbranch = pop_branch(cglobs);
if (!cglobs->onlast) {
Yap_emit(label_op, m, Zero, &cglobs->cint);
if ((cglobs->onlast = save))
c_goal(MkAtomTerm(AtomTrue), mod, cglobs);
}
Yap_emit(pop_or_op, Zero, Zero, &cglobs->cint);
return;
}
else if (f == FunctorComma) {
int save = cglobs->onlast;
int t2 = ArgOfTerm(2, Goal);
cglobs->onlast = FALSE;
c_goal(ArgOfTerm(1, Goal), mod, cglobs);
cglobs->onlast = save;
c_goal(t2, mod, cglobs);
return;
}
else if (f == FunctorNot || f == FunctorAltNot) {
CELL label = (cglobs->labelno += 2);
CELL end_label = (cglobs->labelno += 2);
int save = cglobs->onlast;
Term commitvar;
commitvar = MkVarTerm();
if (H == (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
push_branch(cglobs->onbranch, commitvar, cglobs);
++cglobs->curbranch;
cglobs->onbranch = cglobs->curbranch;
cglobs->or_found = TRUE;
cglobs->onlast = FALSE;
c_var(commitvar, save_b_flag, 1, 0, cglobs);
Yap_emit_3ops(push_or_op, label, Zero, Zero, &cglobs->cint);
Yap_emit_3ops(either_op, label, Zero, Zero, &cglobs->cint);
Yap_emit(restore_tmps_op, Zero, Zero, &cglobs->cint);
c_goal(ArgOfTerm(1, Goal), mod, cglobs);
c_var(commitvar, commit_b_flag, 1, 0, cglobs);
cglobs->onlast = save;
Yap_emit(fail_op, end_label, Zero, &cglobs->cint);
Yap_emit(pushpop_or_op, Zero, Zero, &cglobs->cint);
Yap_emit(label_op, label, Zero, &cglobs->cint);
Yap_emit(orlast_op, Zero, Zero, &cglobs->cint);
Yap_emit(label_op, end_label, Zero, &cglobs->cint);
cglobs->onlast = save;
/* --cglobs->onbranch; */
cglobs->onbranch = pop_branch(cglobs);
c_goal(MkAtomTerm(AtomTrue), mod, cglobs);
++cglobs->goalno;
Yap_emit(pop_or_op, Zero, Zero, &cglobs->cint);
return;
}
else if (f == FunctorArrow) {
Term commitvar;
int save = cglobs->onlast;
commitvar = MkVarTerm();
if (H == (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
cglobs->onlast = FALSE;
c_var(commitvar, save_b_flag, 1, 0, cglobs);
c_goal(ArgOfTerm(1, Goal), mod, cglobs);
c_var(commitvar, commit_b_flag, 1, 0, cglobs);
cglobs->onlast = save;
c_goal(ArgOfTerm(2, Goal), mod, cglobs);
return;
}
else if (f == FunctorEq) {
if (profiling)
Yap_emit(enter_profiling_op, (CELL)p, Zero, &cglobs->cint);
else if (call_counting)
Yap_emit(count_call_op, (CELL)p, Zero, &cglobs->cint);
c_eq(ArgOfTerm(1, Goal), ArgOfTerm(2, Goal), cglobs);
if (cglobs->onlast) {
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred))
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
else
#endif /* TABLING */
Yap_emit(procceed_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
}
return;
}
else if (p->PredFlags & AsmPredFlag) {
int op = p->PredFlags & 0x7f;
if (profiling)
Yap_emit(enter_profiling_op, (CELL)p, Zero, &cglobs->cint);
else if (call_counting)
Yap_emit(count_call_op, (CELL)p, Zero, &cglobs->cint);
if (op >= _atom && op <= _primitive) {
c_test(op, ArgOfTerm(1, Goal), cglobs);
if (cglobs->onlast) {
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred))
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
else
#endif /* TABLING */
Yap_emit(procceed_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
}
return;
}
else if (op >= _plus && op <= _functor) {
if (op == _functor) {
c_functor(Goal, mod, cglobs);
}
else {
c_bifun(op,
ArgOfTerm(1, Goal),
ArgOfTerm(2, Goal),
ArgOfTerm(3, Goal),
mod,
cglobs);
}
if (cglobs->onlast) {
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred))
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
else
#endif /* TABLING */
Yap_emit(procceed_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
}
return;
}
else {
c_args(Goal, 0, cglobs);
}
}
else if (p->PredFlags & BinaryTestPredFlag) {
Term a1 = ArgOfTerm(1,Goal);
if (IsVarTerm(a1) && !IsNewVar(a1)) {
Term a2 = ArgOfTerm(2,Goal);
if (IsVarTerm(a2) && !IsNewVar(a2)) {
if (IsNewVar(a2)) {
Yap_Error_TYPE = INSTANTIATION_ERROR;
Yap_Error_Term = a2;
Yap_ErrorMessage = Yap_ErrorSay;
sprintf(Yap_ErrorMessage, "compiling %s/2 with second arg unbound", RepAtom(NameOfFunctor(p->FunctorOfPred))->StrOfAE);
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,1);
}
c_var(a1, bt1_flag, 2, 0, cglobs);
cglobs->current_p0 = p0;
c_var(a2, bt2_flag, 2, 0, cglobs);
}
else {
Term t2 = MkVarTerm();
if (H == (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
c_eq(t2, a2, cglobs);
c_var(a1, bt1_flag, 2, 0, cglobs);
cglobs->current_p0 = p0;
c_var(t2, bt2_flag, 2, 0, cglobs);
}
} else {
Term a2 = ArgOfTerm(2,Goal);
Term t1 = MkVarTerm();
if (H == (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
c_eq(t1, a1, cglobs);
if (IsVarTerm(a2) && !IsNewVar(a2)) {
c_var(t1, bt1_flag, 2, 0, cglobs);
cglobs->current_p0 = p0;
c_var(a2, bt2_flag, 2, 0, cglobs);
}
else {
Term t2 = MkVarTerm();
if (H == (CELL *)cglobs->cint.freep0) {
/* oops, too many new variables */
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch,4);
}
c_eq(t2, a2, cglobs);
c_var(t1, bt1_flag, 2, 0, cglobs);
cglobs->current_p0 = p0;
c_var(t2, bt2_flag, 2, 0, cglobs);
}
}
if (cglobs->onlast) {
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred))
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
else
#endif /* TABLING */
Yap_emit(procceed_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
}
return;
} else {
if (profiling)
Yap_emit(enter_profiling_op, (CELL)p, Zero, &cglobs->cint);
else if (call_counting)
Yap_emit(count_call_op, (CELL)p, Zero, &cglobs->cint);
if (f == FunctorExecuteInMod) {
/* compile the first argument only */
c_arg(1, ArgOfTerm(1,Goal), 1, 0, cglobs);
} else {
c_args(Goal, 0, cglobs);
}
}
}
if (p->PredFlags & SafePredFlag
#ifdef YAPOR
/* synchronisation means saving the state, so it is never safe in YAPOR */
&& !(p->PredFlags & SyncPredFlag)
#endif /* YAPOR */
) {
Yap_emit(safe_call_op, (CELL) p0, Zero, &cglobs->cint);
if (cglobs->onlast) {
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred))
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
else
#endif /* TABLING */
Yap_emit(procceed_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
}
}
else {
if (p->PredFlags & (CPredFlag | AsmPredFlag)) {
#ifdef YAPOR
if (p->PredFlags & SyncPredFlag)
Yap_emit(sync_op, (CELL)p, (CELL)(p->ArityOfPE), &cglobs->cint);
#endif /* YAPOR */
if (p->FunctorOfPred == FunctorExecuteInMod) {
Yap_emit_4ops(call_op, (CELL) p0, Zero, Zero, ArgOfTerm(2,Goal), &cglobs->cint);
} else {
Yap_emit_3ops(call_op, (CELL) p0, Zero, Zero, &cglobs->cint);
}
/* functor is allowed to call the garbage collector */
if (cglobs->onlast) {
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
cglobs->or_found = TRUE;
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred))
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
else
#endif /* TABLING */
Yap_emit(procceed_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
}
}
else {
if (cglobs->onlast) {
Yap_emit(deallocate_op, Zero, Zero, &cglobs->cint);
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred)) {
Yap_emit_3ops(call_op, (CELL) p0, Zero, Zero, &cglobs->cint);
Yap_emit(table_new_answer_op, Zero, cglobs->cint.CurrentPred->ArityOfPE, &cglobs->cint);
}
else
#endif /* TABLING */
Yap_emit(execute_op, (CELL) p0, Zero, &cglobs->cint);
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
}
else {
Yap_emit_3ops(call_op, (CELL) p0, Zero, Zero, &cglobs->cint);
}
}
if (!cglobs->onlast)
++cglobs->goalno;
}
}
static void
c_body(Term Body, int mod, compiler_struct *cglobs)
{
cglobs->onhead = FALSE;
cglobs->BodyStart = cglobs->cint.cpc;
cglobs->goalno = 1;
while (IsNonVarTerm(Body) && IsApplTerm(Body)
&& FunctorOfTerm(Body) == FunctorComma) {
Term t2 = ArgOfTerm(2, Body);
if (IsTrueGoal(t2)) {
/* optimise the case where some idiot left trues at the end
of the clause.
*/
Body = ArgOfTerm(1, Body);
break;
}
c_goal(ArgOfTerm(1, Body), mod, cglobs);
Body = t2;
}
cglobs->onlast = TRUE;
c_goal(Body, mod, cglobs);
}
static void
c_head(Term t, compiler_struct *cglobs)
{
Functor f;
cglobs->goalno = 0;
cglobs->onhead = TRUE;
cglobs->onlast = FALSE;
cglobs->curbranch = cglobs->onbranch = 0;
cglobs->branch_pointer = cglobs->parent_branches;
if (IsAtomTerm(t)) {
Yap_emit(name_op, (CELL) AtomOfTerm(t), Zero, &cglobs->cint);
return;
}
f = FunctorOfTerm(t);
Yap_emit(name_op, (CELL) NameOfFunctor(f), ArityOfFunctor(f), &cglobs->cint);
c_args(t, 0, cglobs);
}
/* number of permanent variables in the clause */
static int nperm;
inline static int
usesvar(compiler_vm_op ic)
{
if (ic >= get_var_op && ic <= put_val_op)
return (TRUE);
switch (ic) {
case save_b_op:
case commit_b_op:
case patch_b_op:
case save_appl_op:
case save_pair_op:
case f_val_op:
case f_var_op:
case fetch_args_for_bccall:
case bccall_op:
return (TRUE);
default:
break;
}
#ifdef SFUNC
if (ic >= unify_s_var_op && ic <= write_s_val_op)
return (TRUE);
#endif
return ((ic >= unify_var_op && ic <= write_val_op)
||
(ic >= unify_last_var_op && ic <= unify_last_val_op));
}
/*
* Do as in the traditional WAM and make sure voids are in
* environments
*/
#define LOCALISE_VOIDS 1
#ifdef LOCALISE_VOIDS
typedef struct env_tmp {
Ventry * Var;
struct env_tmp *Next;
} EnvTmp;
#endif
static void
AssignPerm(PInstr *pc, compiler_struct *cglobs)
{
int uses_var;
PInstr *opc = NULL;
#ifdef LOCALISE_VOIDS
EnvTmp *EnvTmps = NULL;
#endif
/* The WAM tries to keep voids on the
* environment. Traditionally, YAP liberally globalises
* voids.
*
* The new version goes to some length to keep void variables
* in environments, but it is dubious that improves
* performance, and may actually slow down the system
*/
while (pc != NULL) {
PInstr *tpc = pc->nextInst;
#ifdef LOCALISE_VOIDS
if (pc->op == put_var_op) {
Ventry *v = (Ventry *) (pc->rnd1);
if (v->AgeOfVE == v->FirstOfVE
&& !(v->FlagsOfVE & (GlobalVal|OnHeadFlag|OnLastGoal|NonVoid)) ) {
EnvTmp *x = (EnvTmp *)Yap_AllocCMem(sizeof(*x), &cglobs->cint);
x->Next = EnvTmps;
x->Var = v;
EnvTmps = x;
}
}
#endif
if (pc->op == call_op || pc->op == either_op || pc->op == orelse_op || pc->op == push_or_op) {
#ifdef LOCALISE_VOIDS
pc->ops.opseqt[1] = (CELL)EnvTmps;
if (EnvTmps)
EnvTmps = NULL;
#endif
}
pc->nextInst = opc;
opc = pc;
pc = tpc;
}
pc = opc;
opc = NULL;
do {
PInstr *npc = pc->nextInst;
pc->nextInst = opc;
uses_var = usesvar(pc->op);
if (uses_var) {
Ventry *v = (Ventry *) (pc->rnd1);
if (v->NoOfVE == Unassigned) {
if ((v->AgeOfVE > 1 && (v->AgeOfVE > v->FirstOfVE))
|| v->KindOfVE == PermVar /*
* * || (v->FlagsOfVE & NonVoid && !(v->FlagsOfVE &
* * OnHeadFlag))
*/ ) {
v->NoOfVE = PermVar | (nperm++);
v->KindOfVE = PermVar;
v->FlagsOfVE |= PermFlag;
}
else
v->NoOfVE = v->KindOfVE = TempVar;
}
} else if (pc->op == empty_call_op) {
pc->rnd2 = nperm;
} else if (pc->op == call_op || pc->op == either_op || pc->op == orelse_op || pc->op == push_or_op) {
#ifdef LOCALISE_VOIDS
EnvTmps = (EnvTmp *)(pc->ops.opseqt[1]);
while (EnvTmps) {
Ventry *v = EnvTmps->Var;
v->NoOfVE = PermVar | (nperm++);
v->KindOfVE = PermVar;
v->FlagsOfVE |= (PermFlag|SafeVar);
EnvTmps = EnvTmps->Next;
}
#endif
pc->rnd2 = nperm;
} else if (pc->op == cut_op || pc->op == cutexit_op) {
pc->rnd2 = nperm;
}
opc = pc;
pc = npc;
} while (pc != NULL);
}
static CELL *
init_bvarray(int nperm, compiler_struct *cglobs)
{
CELL *vinfo = NULL;
unsigned int i;
CELL *vptr;
vptr = vinfo = (CELL *)Yap_AllocCMem(sizeof(CELL)*(1+nperm/(8*sizeof(CELL))), &cglobs->cint);
for (i = 0; i <= nperm/(8*sizeof(CELL)); i++) {
*vptr++ = (CELL)(0L);
}
return(vinfo);
}
static void
clear_bvarray(int var, CELL *bvarray
#ifdef DEBUG
, compiler_struct *cglobs
#endif
)
{
int max = 8*sizeof(CELL);
CELL nbit;
/* get to the array position */
while (var >= max) {
bvarray++;
var -= max;
}
/* now put a 0 on it, from now on the variable is initialised */
nbit = (1 << var);
#ifdef DEBUG
if (*bvarray & nbit) {
/* someone had already marked this variable: complain */
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = TermNil;
Yap_ErrorMessage = "repeated bit for variable";
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 2);
}
cglobs->pbvars++;
#endif
*bvarray |= nbit;
}
/* copy the current state of the perm variable state array to code space */
static void
add_bvarray_op(PInstr *cp, CELL *bvarray, int env_size, compiler_struct *cglobs)
{
int i, size = env_size/(8*sizeof(CELL));
CELL *dest;
dest =
Yap_emit_extra_size(mark_initialised_pvars_op, (CELL)env_size, (size+1)*sizeof(CELL), &cglobs->cint);
/* copy the cells to dest */
for (i = 0; i <= size; i++)
*dest++ = *bvarray++;
}
/* vsc: this code is not working, as it is too complex */
typedef struct {
int lab;
int last;
PInstr *pc;
} bventry;
#define MAX_DISJUNCTIONS 32
static bventry *bvstack;
static int bvindex = 0;
static void
push_bvmap(int label, PInstr *pcpc, compiler_struct *cglobs)
{
if (bvindex == MAX_DISJUNCTIONS) {
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = TermNil;
Yap_ErrorMessage = "Too many embedded disjunctions";
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 2);
}
/* the label instruction */
bvstack[bvindex].lab = label;
bvstack[bvindex].last = -1;
/* where we have the code */
bvstack[bvindex].pc = pcpc;
bvindex++;
}
static void
reset_bvmap(CELL *bvarray, int nperm, compiler_struct *cglobs)
{
int size, size1, env_size, i;
CELL *source;
if (bvindex == 0) {
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = TermNil;
Yap_ErrorMessage = "No embedding in disjunctions";
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 2);
}
env_size = (bvstack[bvindex-1].pc)->rnd1;
size = env_size/(8*sizeof(CELL));
size1 = nperm/(8*sizeof(CELL));
source = (bvstack[bvindex-1].pc)->arnds;
for (i = 0; i <= size; i++)
*bvarray++ = *source++;
for (i = size+1; i<= size1; i++)
*bvarray++ = (CELL)(0);
}
static void
pop_bvmap(CELL *bvarray, int nperm, compiler_struct *cglobs)
{
if (bvindex == 0) {
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = TermNil;
Yap_ErrorMessage = "Too few embedded disjunctions";
/* save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 2); */
}
reset_bvmap(bvarray, nperm, cglobs);
bvindex--;
}
typedef struct {
PInstr *p;
Ventry *v;
} UnsafeEntry;
/* extend to also support variable usage bitmaps for garbage collection */
static void
CheckUnsafe(PInstr *pc, compiler_struct *cglobs)
{
int pending = 0;
/* say that all variables are yet to initialise */
CELL *vstat = init_bvarray(nperm, cglobs);
UnsafeEntry *UnsafeStack =
(UnsafeEntry *) Yap_AllocCMem(nperm * sizeof(UnsafeEntry), &cglobs->cint);
/* keep a copy of previous cglobs->cint.cpc and CodeStart */
PInstr *opc = cglobs->cint.cpc;
PInstr *OldCodeStart = cglobs->cint.CodeStart;
cglobs->cint.CodeStart = cglobs->cint.BlobsStart;
cglobs->cint.cpc = cglobs->cint.icpc;
bvindex = 0;
bvstack = (bventry *)Yap_AllocCMem(MAX_DISJUNCTIONS * sizeof(bventry), &cglobs->cint);
while (pc != NIL) {
switch(pc->op) {
case put_val_op:
{
Ventry *v = (Ventry *) (pc->rnd1);
if ((v->FlagsOfVE & PermFlag) && !(v->FlagsOfVE & SafeVar)) {
UnsafeStack[pending].p = pc;
UnsafeStack[pending++].v = v;
v->FlagsOfVE |= SafeVar;
}
break;
}
case put_var_op:
case get_var_op:
case save_b_op:
case unify_var_op:
case unify_last_var_op:
case write_var_op:
case save_appl_op:
case save_pair_op:
case f_var_op:
{
Ventry *v = (Ventry *) (pc->rnd1);
if (v->FlagsOfVE & PermFlag && pc == v->FirstOpForV) {
/* the second condition covers cases such as save_b_op
in a disjunction */
clear_bvarray((v->NoOfVE & MaskVarAdrs), vstat
#ifdef DEBUG
, cglobs
#endif
);
}
}
break;
case push_or_op:
Yap_emit(label_op, ++cglobs->labelno, Zero, &cglobs->cint);
pc->ops.opseqt[1] = (CELL)cglobs->labelno;
add_bvarray_op(pc, vstat, pc->rnd2, cglobs);
push_bvmap((CELL)cglobs->labelno, cglobs->cint.cpc, cglobs);
break;
case either_op:
/* add a first entry to the array */
Yap_emit(label_op, ++cglobs->labelno, Zero, &cglobs->cint);
pc->ops.opseqt[1] = (CELL)cglobs->labelno;
add_bvarray_op(pc, vstat, pc->rnd2, cglobs);
break;
case pushpop_or_op:
reset_bvmap(vstat, nperm, cglobs);
break;
case orelse_op:
Yap_emit(label_op, ++cglobs->labelno, Zero, &cglobs->cint);
pc->ops.opseqt[1] = (CELL)cglobs->labelno;
add_bvarray_op(pc, vstat, pc->rnd2, cglobs);
break;
case pop_or_op:
pop_bvmap(vstat, nperm, cglobs);
break;
case empty_call_op:
/* just get ourselves a label describing how
many permanent variables are alive */
Yap_emit(label_op, ++cglobs->labelno, Zero, &cglobs->cint);
pc->rnd1 = (CELL)cglobs->labelno;
add_bvarray_op(pc, vstat, pc->rnd2, cglobs);
break;
case cut_op:
case cutexit_op:
/* just get ourselves a label describing how
many permanent variables are alive */
Yap_emit(label_op, ++cglobs->labelno, Zero, &cglobs->cint);
pc->rnd1 = (CELL)cglobs->labelno;
add_bvarray_op(pc, vstat, pc->rnd2, cglobs);
break;
case call_op:
Yap_emit(label_op, ++cglobs->labelno, Zero, &cglobs->cint);
pc->ops.opseqt[1] = (CELL)cglobs->labelno;
add_bvarray_op(pc, vstat, pc->rnd2, cglobs);
case deallocate_op:
{
int n = pc->op == call_op ? pc->rnd2 : 0;
int no;
while (pending) {
Ventry *v = UnsafeStack[--pending].v;
v->FlagsOfVE &= ~SafeVar;
no = (v->NoOfVE) & MaskVarAdrs;
if (no >= n)
UnsafeStack[pending].p->op = put_unsafe_op;
}
}
default:
break;
}
pc = pc->nextInst;
}
cglobs->cint.icpc = cglobs->cint.cpc;
cglobs->cint.cpc = opc;
cglobs->cint.BlobsStart = cglobs->cint.CodeStart;
cglobs->cint.CodeStart = OldCodeStart;
}
static void
CheckVoids(compiler_struct *cglobs)
{ /* establish voids in the head and initial
* uses */
Ventry *ve;
compiler_vm_op ic;
struct PSEUDO *cpc;
cpc = cglobs->cint.CodeStart;
while ((ic = cpc->op) != allocate_op) {
switch (ic) {
case get_var_op:
case unify_var_op:
case unify_last_var_op:
#ifdef SFUNC
case unify_s_var_op:
#endif
case save_pair_op:
case save_appl_op:
ve = ((Ventry *) cpc->rnd1);
if ((ve->FlagsOfVE & PermFlag) == 0 && ve->RCountOfVE <= 1) {
ve->NoOfVE = ve->KindOfVE = VoidVar;
if (ic == get_var_op || ic ==
save_pair_op || ic == save_appl_op
#ifdef SFUNC
|| ic == unify_s_var_op
#endif
) {
cpc->op = nop_op;
break;
}
}
if (ic != get_var_op)
break;
case get_val_op:
case get_atom_op:
case get_num_op:
case get_float_op:
case get_longint_op:
case get_bigint_op:
case get_list_op:
case get_struct_op:
cglobs->Uses[cpc->rnd2] = 1;
default:
break;
}
cpc = cpc->nextInst;
}
}
static int
checktemp(Int arg, Int rn, compiler_vm_op ic, compiler_struct *cglobs)
{
Ventry *v = (Ventry *) arg;
PInstr *q;
Int Needed[MaxTemps];
Int r, target1, target2;
Int n, *np, *rp;
CELL *cp;
Int vadr;
Int vreg;
cglobs->vadr = vadr = (v->NoOfVE);
cglobs->vreg = vreg = vadr & MaskVarAdrs;
if (v->KindOfVE == PermVar || v->KindOfVE == VoidVar)
return 0;
if (v->RCountOfVE == 1)
return 0;
if (vreg) {
--cglobs->Uses[vreg];
return 1;
}
/* follow the life of the variable */
q = cglobs->cint.cpc;
/*
* for(r=0; r<cglobs->MaxCTemps; ++r) Needed[r] = cglobs->Uses[r]; might be written
* as:
*/
np = Needed;
rp = cglobs->Uses;
for (r = 0; r < cglobs->MaxCTemps; ++r)
*np++ = *rp++;
if (rn > 0 && (ic == get_var_op || ic == put_var_op)) {
if (ic == put_var_op)
Needed[rn] = 1;
target1 = rn; /* try to leave it where it is */
}
else
target1 = cglobs->MaxCTemps;
target2 = cglobs->MaxCTemps;
n = v->RCountOfVE - 1;
while ((q = q->nextInst) != NIL) {
if (q->rnd2 < 0);
else if (usesvar(ic = q->op) && arg == q->rnd1) {
--n;
if (ic == put_val_op) {
if (target1 == cglobs->MaxCTemps && Needed[q->rnd2] == 0)
target1 = q->rnd2;
else if (target1 != (r = q->rnd2)) {
if (target2 == cglobs->MaxCTemps && Needed[r] == 0)
target2 = r;
else if (target2 > r && cglobs->Uses[r] == 0 && Needed[r] == 0)
target2 = r;
}
}
}
#ifdef SFUNC
else if ((ic >= get_var_op && ic <= put_unsafe_op)
|| ic == get_s_f_op || ic == put_s_f_op)
Needed[q->rnd2] = 1;
#else
else if (ic >= get_var_op && ic <= put_unsafe_op)
Needed[q->rnd2] = 1;
#endif
if ((ic == call_op || ic == safe_call_op) && n == 0)
break;
}
if (target2 < target1) {
r = target2;
target2 = target1;
target1 = r;
}
if (target1 == cglobs->MaxCTemps || cglobs->Uses[target1] || Needed[target1])
if ((target1 = target2) == cglobs->MaxCTemps || cglobs->Uses[target1] || Needed[target1]) {
target1 = cglobs->MaxCTemps;
do
--target1;
while (target1 && cglobs->Uses[target1] == 0 && Needed[target1] == 0);
++target1;
}
if (target1 == cglobs->MaxCTemps) {
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = TermNil;
Yap_ErrorMessage = "too many temporaries";
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 1);
}
v->NoOfVE = cglobs->vadr = vadr = TempVar | target1;
v->KindOfVE = TempVar;
cglobs->Uses[cglobs->vreg = vreg = target1] = v->RCountOfVE - 1;
/*
* for(r=0; r<cglobs->MaxCTemps; ++r) if(cglobs->Contents[r]==vadr) cglobs->Contents[r] =
* NIL;
*/
cp = cglobs->Contents;
for (r = 0; r < cglobs->MaxCTemps; ++r)
if (*cp++ == (Term)vadr)
cp[-1] = NIL;
cglobs->Contents[vreg] = vadr;
return 1;
}
static Int
checkreg(Int arg, Int rn, compiler_vm_op ic, int var_arg, compiler_struct *cglobs)
{
PInstr *p = cglobs->cint.cpc;
Int vreg;
if (rn >= 0)
return rn;
vreg = 0;
if (var_arg) {
Ventry *v = (Ventry *) arg;
vreg = (v->NoOfVE) & MaskVarAdrs;
if (v->KindOfVE == PermVar)
vreg = 0;
else if (vreg == 0) {
checktemp(arg, rn, ic, cglobs);
++cglobs->Uses[vreg];
}
}
if (vreg == 0) {
vreg = cglobs->MaxCTemps;
do
--vreg;
while (vreg && cglobs->Uses[vreg] == 0);
++vreg;
++cglobs->Uses[vreg];
}
while (p) {
if (p->op >= get_var_op && p->op <= put_unsafe_op && p->rnd2 == rn)
p->rnd2 = vreg;
/* only copy variables until you reach a call */
if (p->op == procceed_op || p->op == call_op || p->op == push_or_op || p->op == pushpop_or_op)
break;
p = p->nextInst;
}
return vreg;
}
/* Create a bitmap with all live variables */
static CELL
copy_live_temps_bmap(int max, compiler_struct *cglobs)
{
unsigned int size = (max|7)/8+1;
int i;
CELL *dest = Yap_emit_extra_size(mark_live_regs_op, max, size, &cglobs->cint);
CELL *ptr=dest;
*ptr = 0L;
for (i=1; i <= max; i++) {
/* move to next cell */
if (i%(8*CellSize) == 0) {
ptr++;
*ptr = 0L;
}
/* set the register live bit */
if (cglobs->Contents[i]) {
int j = i%(8*CellSize);
*ptr |= (1<<j);
}
}
return((CELL)dest);
}
static void
c_layout(compiler_struct *cglobs)
{
PInstr *savepc = cglobs->BodyStart->nextInst;
register Ventry *v = cglobs->vtable;
Int *up = cglobs->Uses, Arity;
CELL *cop = cglobs->Contents;
cglobs->cint.cpc = cglobs->BodyStart;
while (v != NIL) {
if (v->FlagsOfVE & BranchVar) {
v->AgeOfVE = v->FirstOfVE + 1; /* force permanent */
++(v->RCountOfVE);
Yap_emit(put_var_op, (CELL) v, Zero, &cglobs->cint);
v->FlagsOfVE &= ~GlobalVal;
v->FirstOpForV = cglobs->cint.cpc;
}
v = v->NextOfVE;
}
cglobs->cint.cpc->nextInst = savepc;
nperm = 0;
AssignPerm(cglobs->cint.CodeStart, cglobs);
/* vsc: need to do it from the beginning to find which perm vars are active */
/* CheckUnsafe(cglobs->BodyStart, cglobs); */
#ifdef DEBUG
cglobs->pbvars = 0;
#endif
CheckUnsafe(cglobs->cint.CodeStart, cglobs);
#ifdef DEBUG
if (cglobs->pbvars != nperm) {
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = TermNil;
Yap_ErrorMessage = "wrong number of variables found in bitmap";
save_machine_regs();
longjmp(cglobs->cint.CompilerBotch, 2);
}
#endif
cglobs->MaxCTemps = cglobs->nvars + cglobs->max_args - cglobs->tmpreg + cglobs->n_common_exps + 2;
if (cglobs->MaxCTemps >= MaxTemps)
cglobs->MaxCTemps = MaxTemps;
{
Int rn;
for (rn = 0; rn < cglobs->MaxCTemps; ++rn) {
/* cglobs->Uses[rn] = 0; cglobs->Contents[rn] = NIL; */
*up++ = 0;
*cop++ = NIL;
}
}
CheckVoids(cglobs);
/* second scan: allocate registers */
cglobs->cint.cpc = cglobs->cint.CodeStart;
while (cglobs->cint.cpc) {
compiler_vm_op ic = cglobs->cint.cpc->op;
Int arg = cglobs->cint.cpc->rnd1;
Int rn = cglobs->cint.cpc->rnd2;
switch (ic) {
#ifdef TABLING_INNER_CUTS
case cut_op:
case cutexit_op:
cglobs->cut_mark->op = clause_with_cut_op;
break;
#endif /* TABLING_INNER_CUTS */
case allocate_op:
case deallocate_op:
#ifdef TABLING
READ_LOCK(cglobs->cint.CurrentPred->PRWLock);
if (is_tabled(cglobs->cint.CurrentPred))
cglobs->cint.cpc->op = nop_op;
else
#endif /* TABLING */
if (cglobs->goalno == 1 && !cglobs->or_found && nperm == 0)
cglobs->cint.cpc->op = nop_op;
#ifdef TABLING
READ_UNLOCK(cglobs->cint.CurrentPred->PRWLock);
#endif
break;
case pop_op:
ic = (cglobs->cint.cpc->nextInst)->op;
if (ic >= get_var_op && ic <= put_unsafe_op)
cglobs->cint.cpc->op = nop_op;
break;
case get_var_op:
--cglobs->Uses[rn];
if (checktemp(arg, rn, ic, cglobs)) {
if (cglobs->vreg == rn)
cglobs->cint.cpc->op = nop_op;
}
cglobs->Contents[rn] = cglobs->vadr;
break;
case get_val_op:
--cglobs->Uses[rn];
checktemp(arg, rn, ic, cglobs);
cglobs->Contents[rn] = cglobs->vadr;
break;
case f_var_op:
case unify_var_op:
case unify_val_op:
case unify_last_var_op:
case unify_last_val_op:
#ifdef SFUNC
case unify_s_var_op:
case unify_s_val_op:
#endif
case fetch_args_for_bccall:
case bccall_op:
checktemp(arg, rn, ic, cglobs);
break;
case get_atom_op:
case get_num_op:
case get_float_op:
case get_longint_op:
case get_bigint_op:
--cglobs->Uses[rn];
cglobs->Contents[rn] = arg;
break;
case get_list_op:
case get_struct_op:
cglobs->Contents[rn] = NIL;
--cglobs->Uses[rn];
break;
case put_var_op:
case put_unsafe_op:
rn = checkreg(arg, rn, ic, TRUE, cglobs);
checktemp(arg, rn, ic, cglobs);
cglobs->Contents[rn] = cglobs->vadr;
++cglobs->Uses[rn];
break;
case put_val_op:
rn = checkreg(arg, rn, ic, TRUE, cglobs);
checktemp(arg, rn, ic, cglobs);
if (cglobs->Contents[rn] == (Term)cglobs->vadr)
cglobs->cint.cpc->op = nop_op;
cglobs->Contents[rn] = cglobs->vadr;
++cglobs->Uses[rn];
break;
#ifdef SFUNC
case write_s_var_op:
{
Ventry *ve = (Ventry *) arg;
if ((ve->FlagsOfVE & PermFlag) == 0 && ve->RCountOfVE <= 1)
cglobs->cint.cpc->op = nop_op;
}
break;
case write_s_val_op:
#endif
case write_var_op:
case write_val_op:
case f_val_op:
checktemp(arg, rn, ic, cglobs);
break;
#ifdef SFUNC
case put_s_f_op:
cglobs->Contents[rn] = arg;
++cglobs->Uses[rn];
break;
#endif
case put_atom_op:
case put_num_op:
case put_float_op:
case put_longint_op:
case put_bigint_op:
rn = checkreg(arg, rn, ic, FALSE, cglobs);
if (cglobs->Contents[rn] == arg)
cglobs->cint.cpc->op = nop_op;
cglobs->Contents[rn] = arg;
++cglobs->Uses[rn];
break;
case put_list_op:
case put_struct_op:
rn = checkreg(arg, rn, ic, FALSE, cglobs);
cglobs->Contents[rn] = NIL;
++cglobs->Uses[rn];
break;
case commit_b_op:
#ifdef TABLING_INNER_CUTS
cglobs->cut_mark->op = clause_with_cut_op;
#endif /* TABLING_INNER_CUTS */
case save_b_op:
case patch_b_op:
case save_appl_op:
case save_pair_op:
checktemp(arg, rn, ic, cglobs);
break;
case safe_call_op:
Arity = RepPredProp((Prop) arg)->ArityOfPE;
for (rn = 1; rn <= Arity; ++rn)
--cglobs->Uses[rn];
break;
case call_op:
case label_op:
/*
* for(rn=1; rn<cglobs->MaxCTemps; ++rn) cglobs->Uses[rn] =
* cglobs->Contents[rn] = NIL;
*/
up = cglobs->Uses;
cop = cglobs->Contents;
for (rn = 1; rn < cglobs->MaxCTemps; ++rn)
*up++ = *cop++ = NIL;
break;
case cut_op:
case cutexit_op:
{
int i, max;
max = 0;
for (i = 1; i < cglobs->MaxCTemps; ++i) {
if (cglobs->Contents[i]) max = i;
}
cglobs->cint.cpc->ops.opseqt[1] = max;
}
break;
case restore_tmps_and_skip_op:
case restore_tmps_op:
/*
This instruction is required by the garbage collector to find out
how many temporaries are live right now. It is also useful when
waking up goals before an either or ! instruction.
*/
{
PInstr *mycpc = cglobs->cint.cpc, *oldCodeStart = cglobs->cint.CodeStart;
int i, max;
/* instructions must be placed at BlobsStart */
cglobs->cint.CodeStart = cglobs->cint.BlobsStart;
cglobs->cint.cpc = cglobs->cint.icpc;
max = 0;
for (i = 1; i < cglobs->MaxCTemps; ++i) {
if (cglobs->Contents[i]) max = i;
}
Yap_emit(label_op, ++cglobs->labelno, Zero, &cglobs->cint);
mycpc->rnd1 = cglobs->labelno;
rn = copy_live_temps_bmap(max, cglobs);
cglobs->cint.icpc = cglobs->cint.cpc;
cglobs->cint.BlobsStart = cglobs->cint.CodeStart;
cglobs->cint.cpc = mycpc;
cglobs->cint.CodeStart = oldCodeStart;
}
default:
break;
}
if (cglobs->cint.cpc->nextInst)
cglobs->cint.cpc = cglobs->cint.cpc->nextInst;
else return;
}
}
static void
c_optimize(PInstr *pc)
{
char onTail;
Ventry *v;
PInstr *opc = NULL;
/* first reverse the pointers */
while (pc != NULL) {
PInstr *tpc = pc->nextInst;
pc->nextInst = opc;
opc = pc;
pc = tpc;
}
pc = opc;
opc = NULL;
onTail = 1;
do {
PInstr *npc = pc->nextInst;
pc->nextInst = opc;
switch (pc->op) {
case save_pair_op:
{
Term ve = (Term) pc->rnd1;
PInstr *npc = pc->nextInst;
if (((Ventry *) ve)->RCountOfVE <= 1)
pc->op = nop_op;
else {
*pc = *npc;
pc->nextInst = npc;
npc->op = save_pair_op;
npc->rnd1 = (CELL) ve;
}
}
break;
case save_appl_op:
{
Term ve = (Term) pc->rnd1;
PInstr *npc = pc->nextInst;
if (((Ventry *) ve)->RCountOfVE <= 1)
pc->op = nop_op;
else {
*pc = *npc;
pc->nextInst = npc;
npc->op = save_appl_op;
npc->rnd1 = (CELL) ve;
}
break;
}
case nop_op:
break;
case unify_var_op:
case unify_last_var_op:
#ifdef OLD_SYSTEM
/* In the good old days Yap would remove lots of small void
* instructions for a structure. This is not such a
* good idea nowadays, as we need to know where we
* finish the structure for the last instructions to
* work correctly. Instead, we will use unify_void
* with very little overhead */
v = (Ventry *) (pc->rnd1);
if (v->KindOfVE == VoidVar && onTail) {
pc->op = nop_op;
}
else
#endif /* OLD_SYSTEM */
onTail = 0;
break;
case unify_val_op:
v = (Ventry *) (pc->rnd1);
if (!(v->FlagsOfVE & GlobalVal))
pc->op = unify_local_op;
onTail = 0;
break;
case unify_last_val_op:
v = (Ventry *) (pc->rnd1);
if (!(v->FlagsOfVE & GlobalVal))
pc->op = unify_last_local_op;
onTail = 0;
break;
case write_val_op:
v = (Ventry *) (pc->rnd1);
if (!(v->FlagsOfVE & GlobalVal))
pc->op = write_local_op;
onTail = 0;
break;
case pop_op:
if (FALSE && onTail == 1) {
pc->op = nop_op;
onTail = 1;
break;
}
else {
PInstr *p = pc->nextInst;
while (p != NIL && p->op == nop_op)
p = p->nextInst;
if (p != NIL && p->op == pop_op) {
pc->rnd1 += p->rnd1;
pc->nextInst = p->nextInst;
}
onTail = 2;
break;
}
case write_var_op:
case unify_atom_op:
case unify_last_atom_op:
case write_atom_op:
case unify_num_op:
case unify_last_num_op:
case write_num_op:
case unify_float_op:
case unify_last_float_op:
case write_float_op:
case unify_longint_op:
case unify_bigint_op:
case unify_last_longint_op:
case unify_last_bigint_op:
case write_longint_op:
case write_bigint_op:
case unify_list_op:
case write_list_op:
case unify_struct_op:
case write_struct_op:
case write_unsafe_op:
case unify_last_list_op:
case write_last_list_op:
case unify_last_struct_op:
case write_last_struct_op:
#ifdef SFUNC
case unify_s_f_op:
case write_s_f_op:
#endif
onTail = 0;
break;
default:
onTail = 1;
break;
}
opc = pc;
pc = npc;
} while (pc != NULL);
}
yamop *
Yap_cclause(Term inp_clause, int NOfArgs, int mod, Term src)
{ /* compile a prolog clause, copy of clause myst be in ARG1 */
/* returns address of code for clause */
Term head, body;
yamop *acode;
volatile int maxvnum = 512;
int botch_why;
volatile Term my_clause = inp_clause;
/* may botch while doing a different module */
/* first, initialise cglobs->cint.CompilerBotch to handle all cases of interruptions */
Yap_ErrorMessage = NULL;
Yap_Error_Size = 0;
compiler_struct cglobs;
if ((botch_why = setjmp(cglobs.cint.CompilerBotch)) == 3) {
/* out of local stack, just duplicate the stack */
restore_machine_regs();
reset_vars(cglobs.vtable);
{
Int osize = 2*sizeof(CELL)*(ASP-H);
ARG1 = my_clause;
*H++ = src;
if (!Yap_gcl(Yap_Error_Size, 2, ENV, P)) {
Yap_Error_TYPE = OUT_OF_STACK_ERROR;
Yap_Error_Term = my_clause;
}
if (osize > ASP-H) {
if (!Yap_growstack(2*sizeof(CELL)*(ASP-H))) {
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = my_clause;
}
}
src = *--H;
my_clause = ARG1;
}
} else if (botch_why == 4) {
/* out of temporary cells */
restore_machine_regs();
reset_vars(cglobs.vtable);
if (maxvnum < 16*1024) {
maxvnum *= 2;
} else {
maxvnum += 4096;
}
} else if (botch_why == 2) {
/* not enough heap */
restore_machine_regs();
reset_vars(cglobs.vtable);
Yap_Error_TYPE = SYSTEM_ERROR;
Yap_Error_Term = TermNil;
return(0);
}
restart_compilation:
if (Yap_ErrorMessage != NULL) {
reset_vars(cglobs.vtable);
return (0);
}
HB = H;
Yap_ErrorMessage = NULL;
/* initialize variables for code generation */
cglobs.cint.CodeStart = cglobs.cint.cpc = NULL;
cglobs.cint.BlobsStart = cglobs.cint.icpc = NULL;
cglobs.cint.freep =
cglobs.cint.freep0 =
(char *) (H + maxvnum+(sizeof(Int)/sizeof(CELL))*MaxTemps+MaxTemps);
if (ASP <= CellPtr (cglobs.cint.freep) + 256) {
cglobs.vtable = NULL;
Yap_Error_Size = (256+maxvnum)*sizeof(CELL);
save_machine_regs();
longjmp(cglobs.cint.CompilerBotch,3);
}
cglobs.Uses = (Term *)(H+maxvnum);
cglobs.Contents = (Term *)(H+maxvnum+(sizeof(Int)/sizeof(CELL))*MaxTemps);
cglobs.curbranch = cglobs.onbranch = 0;
cglobs.branch_pointer = cglobs.parent_branches;
cglobs.or_found = FALSE;
cglobs.max_args = 0;
cglobs.nvars = 0;
cglobs.tmpreg = 0;
/*
* 2000 added to H in case we need to construct call(G) when G is a
* variable used as a goal
*/
cglobs.vtable = NULL;
cglobs.common_exps = NULL;
cglobs.n_common_exps = 0;
cglobs.labelno = 0L;
if (IsVarTerm(my_clause)) {
Yap_Error_TYPE = INSTANTIATION_ERROR;
Yap_Error_Term = my_clause;
Yap_ErrorMessage = "in compiling clause";
return 0;
}
if (IsApplTerm(my_clause) && FunctorOfTerm(my_clause) == FunctorAssert) {
head = ArgOfTerm(1, my_clause);
body = ArgOfTerm(2, my_clause);
}
else {
head = my_clause, body = MkAtomTerm(AtomTrue);
}
if (IsVarTerm(head) || IsPairTerm(head) || IsIntTerm(head) || IsFloatTerm(head) || IsRefTerm(head)) {
Yap_Error_TYPE = TYPE_ERROR_CALLABLE;
Yap_Error_Term = my_clause;
Yap_ErrorMessage = "clause should be atom or term";
return (0);
} else {
/* find out which predicate we are compiling for */
if (IsAtomTerm(head)) {
Atom ap = AtomOfTerm(head);
cglobs.cint.CurrentPred = RepPredProp(PredPropByAtom(ap, mod));
} else {
cglobs.cint.CurrentPred = RepPredProp(PredPropByFunc(FunctorOfTerm(head),mod));
}
/* insert extra instructions to count calls */
READ_LOCK(cglobs.cint.CurrentPred->PRWLock);
if ((cglobs.cint.CurrentPred->PredFlags & ProfiledPredFlag) ||
(PROFILING && (cglobs.cint.CurrentPred->cs.p_code.FirstClause == NIL))) {
profiling = TRUE;
call_counting = FALSE;
} else if ((cglobs.cint.CurrentPred->PredFlags & CountPredFlag) ||
(CALL_COUNTING && (cglobs.cint.CurrentPred->cs.p_code.FirstClause == NIL))) {
call_counting = TRUE;
profiling = FALSE;
} else {
profiling = FALSE;
call_counting = FALSE;
}
READ_UNLOCK(cglobs.cint.CurrentPred->PRWLock);
}
/* phase 1 : produce skeleton code and variable information */
c_head(head, &cglobs);
#ifdef TABLING_INNER_CUTS
Yap_emit(nop_op, Zero, Zero, &cglobs.cint);
cglobs->cut_mark = cpc;
#endif /* TABLING_INNER_CUTS */
Yap_emit(allocate_op, Zero, Zero, &cglobs.cint);
c_body(body, mod, &cglobs);
/* Insert blobs at the very end */
if (cglobs.cint.BlobsStart != NULL) {
cglobs.cint.cpc->nextInst = cglobs.cint.BlobsStart;
cglobs.cint.BlobsStart = NULL;
}
reset_vars(cglobs.vtable);
H = HB;
if (B != NULL) {
HB = B->cp_h;
}
if (Yap_ErrorMessage)
return (0);
#ifdef DEBUG
if (Yap_Option['g' - 96])
Yap_ShowCode(&cglobs.cint);
#endif
/* phase 2: classify variables and optimize temporaries */
c_layout(&cglobs);
/* Insert blobs at the very end */
if (cglobs.cint.BlobsStart != NULL) {
cglobs.cint.cpc->nextInst = cglobs.cint.BlobsStart;
cglobs.cint.BlobsStart = NULL;
while (cglobs.cint.cpc->nextInst != NULL)
cglobs.cint.cpc = cglobs.cint.cpc->nextInst;
}
/* eliminate superfluous pop's and unify_var's */
c_optimize(cglobs.cint.CodeStart);
#ifdef DEBUG
if (Yap_Option['f' - 96])
Yap_ShowCode(&cglobs.cint);
#endif
/* phase 3: assemble code */
acode = Yap_assemble(ASSEMBLING_CLAUSE, src, cglobs.cint.CurrentPred, body == MkAtomTerm(AtomTrue), &cglobs.cint);
/* check first if there was space for us */
if (acode == NULL) {
/* make sure we have enough space */
reset_vars(cglobs.vtable);
if (!Yap_growheap(FALSE, Yap_Error_Size, NULL)) {
save_machine_regs();
my_clause = Deref(ARG1);
longjmp(cglobs.cint.CompilerBotch, 2);
return(NULL);
} else {
my_clause = Deref(ARG1);
goto restart_compilation;
}
} else {
#ifdef LOW_PROF
if (ProfilerOn) {
Yap_inform_profiler_of_clause(acode, ProfEnd, cglobs.cint.CurrentPred,0);
}
#endif /* LOW_PROF */
return(acode);
}
}
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