* included in the distribution.
*
* $RCSfile: static.c,v $
- * $Revision: 1.10 $
- * $Date: 1999/10/15 21:40:55 $
+ * $Revision: 1.11 $
+ * $Date: 1999/10/16 02:17:30 $
* ------------------------------------------------------------------------*/
#include "prelude.h"
static Type local instantiateSyn Args((Type,Type));
static Void local checkClassDefn Args((Class));
-static Void local depPredExp Args((Int,List,Cell));
+static Cell local depPredExp Args((Int,List,Cell));
static Void local checkMems Args((Class,List,Cell));
static Void local addMembers Args((Class));
static Name local newMember Args((Int,Int,Cell,Type,Class));
static Name local newDSel Args((Class,Int));
-static Name local newDBuild Args((Class));
static Text local generateText Args((String,Class));
static Int local visitClass Args((Class));
static Name local memberName Args((Class,Text));
static List local numInsert Args((Int,Cell,List));
+static List local typeVarsIn Args((Cell,List,List,List));
static List local maybeAppendVar Args((Cell,List));
static Type local checkSigType Args((Int,String,Cell,Type));
+static Void local checkOptQuantVars Args((Int,List,List));
static Type local depTopType Args((Int,List,Type));
static Type local depCompType Args((Int,List,Type));
static Type local depTypeExp Args((Int,List,Type));
static Type local depTypeVar Args((Int,List,Text));
static List local checkQuantVars Args((Int,List,List,Cell));
+static List local otvars Args((Cell,List));
+static Bool local osubset Args((List,List));
static Void local kindConstr Args((Int,Int,Int,Constr));
static Kind local kindAtom Args((Int,Constr));
static Void local kindPred Args((Int,Int,Int,Cell));
static Void local initDerInst Args((Inst));
static Void local calcInstPreds Args((Inst));
static Void local maybeAddPred Args((Cell,Int,Int,List));
+static List local calcFunDeps Args((List));
static Cell local copyAdj Args((Cell,Int,Int));
static Void local tidyDerInst Args((Inst));
+static List local otvarsZonk Args((Cell,List,Int));
static Void local addDerivImp Args((Inst));
static Void local depConFlds Args((Int,Cell,Bool));
static Void local depUpdFlds Args((Int,Cell));
static List local depFields Args((Int,Cell,List,Bool));
+#if IPARAM
+static Void local depWith Args((Int,Cell));
+static List local depDwFlds Args((Int,Cell,List));
+#endif
#if TREX
static Cell local depRecord Args((Int,Cell));
#endif
static Void local addRSsigdecls Args((Pair));
static Void local allNoPrevDef Args((Cell));
static Void local noPrevDef Args((Int,Cell));
+static Bool local odiff Args((List,List));
+
static Void local duplicateErrorAux Args((Int,Module,Text,String));
#define duplicateError(l,m,t,k) duplicateErrorAux(l,m,t,k)
static Void local checkTypeIn Args((Pair));
EEND;
}
}
- return 0; /* NOTREACHED */
+ return exports; /* NOTUSED */
}
static List local checkExports(exports)
for (i=0; i<tycon(t).arity; ++i) /* build representation for tycon */
lhs = ap(lhs,mkOffset(i)); /* applied to full comp. of args */
- if (whatIs(cs)==QUAL) { /* allow for possible context */
+ if (isQualType(cs)) { /* allow for possible context */
ctxt = fst(snd(cs));
cs = snd(snd(cs));
- map2Proc(depPredExp,line,tyvars,ctxt);
+ map2Over(depPredExp,line,tyvars,ctxt);
h98CheckCtxt(line,"context",TRUE,ctxt,NIL);
}
sig = checkQuantVars(line,evs,sig,con);
}
- if (whatIs(con)==QUAL) { /* Local predicates */
+ if (isQualType(con)) { /* Local predicates */
List us;
lps = fst(snd(con));
- for (us = typeVarsIn(lps,NIL,NIL); nonNull(us); us=tl(us))
+ for (us = typeVarsIn(lps,NIL,NIL,NIL); nonNull(us); us=tl(us))
if (!varIsMember(textOf(hd(us)),evs)) {
ERRMSG(line)
"Variable \"%s\" in constraint is not locally bound",
textToStr(textOf(hd(us)))
EEND;
}
- map2Proc(depPredExp,line,sig,lps);
+ map2Over(depPredExp,line,sig,lps);
con = snd(snd(con));
arity = length(lps);
}
Type ty = fun(con);
Type cmp = arg(con);
fun(con) = typeArrow;
- if (isPolyType(cmp)) {
+ if (isPolyOrQualType(cmp)) {
if (nonNull(derivs)) {
ERRMSG(line) "Cannot derive instances for types" ETHEN
- ERRTEXT " with polymorphic components"
+ ERRTEXT " with polymorphic or qualified components"
EEND;
}
if (nr2==0)
* stages of static analysis.
* ------------------------------------------------------------------------*/
-Void classDefn(line,head,ms) /* process new class definition */
-Int line; /* definition line number */
-Cell head; /* class header :: ([Supers],Class) */
-List ms; { /* class definition body */
+Void classDefn(line,head,ms,fds) /* process new class definition */
+Int line; /* definition line number */
+Cell head; /* class header :: ([Supers],Class) */
+List ms; /* class definition body */
+List fds; { /* functional dependencies */
Text ct = textOf(getHead(snd(head)));
Int arity = argCount;
if (nonNull(findClass(ct))) {
- ERRMSG(line) "Repeated definition of class \"%s\"",
- textToStr(ct)
- EEND;
+ ERRMSG(line) "Repeated definition of class \"%s\"",
+ textToStr(ct)
+ EEND;
} else if (nonNull(findTycon(ct))) {
- ERRMSG(line) "\"%s\" used as both class and type constructor",
- textToStr(ct)
- EEND;
+ ERRMSG(line) "\"%s\" used as both class and type constructor",
+ textToStr(ct)
+ EEND;
} else {
- Class nw = newClass(ct);
- cclass(nw).line = line;
- cclass(nw).arity = arity;
- cclass(nw).head = snd(head);
- cclass(nw).supers = fst(head);
- cclass(nw).members = ms;
- cclass(nw).level = 0;
- classDefns = cons(nw,classDefns);
- if (arity!=1)
- h98DoesntSupport(line,"multiple parameter classes");
+ Class nw = newClass(ct);
+ cclass(nw).line = line;
+ cclass(nw).arity = arity;
+ cclass(nw).head = snd(head);
+ cclass(nw).supers = fst(head);
+ cclass(nw).members = ms;
+ cclass(nw).level = 0;
+ cclass(nw).fds = fds;
+ classDefns = cons(nw,classDefns);
+ if (arity!=1)
+ h98DoesntSupport(line,"multiple parameter classes");
}
}
tyvars = cons(arg(temp),tyvars);
}
- for (temp=cclass(c).head; args>0; temp=fun(temp), args--) {
- arg(temp) = mkOffset(args);
+ for (fs=cclass(c).fds; nonNull(fs); fs=tl(fs)) {
+ Pair fd = hd(fs);
+ List vs = snd(fd);
+
+ /* Check for trivial dependency
+ */
+ if (isNull(snd(fd))) {
+ ERRMSG(cclass(c).line) "Functional dependency is trivial"
+ EEND;
+ }
+
+ /* Check for duplicated vars on right hand side, and for vars on
+ * right that also appear on the left:
+ */
+ for (vs=snd(fd); nonNull(vs); vs=tl(vs)) {
+ if (varIsMember(textOf(hd(vs)),fst(fd))) {
+ ERRMSG(cclass(c).line)
+ "Trivial dependency for variable \"%s\"",
+ textToStr(textOf(hd(vs)))
+ EEND;
+ }
+ if (varIsMember(textOf(hd(vs)),tl(vs))) {
+ ERRMSG(cclass(c).line)
+ "Repeated variable \"%s\" in functional dependency",
+ textToStr(textOf(hd(vs)))
+ EEND;
+ }
+ hd(vs) = depTypeVar(cclass(c).line,tyvars,textOf(hd(vs)));
+ }
+
+ /* Check for duplicated vars on left hand side:
+ */
+ for (vs=fst(fd); nonNull(vs); vs=tl(vs)) {
+ if (varIsMember(textOf(hd(vs)),tl(vs))) {
+ ERRMSG(cclass(c).line)
+ "Repeated variable \"%s\" in functional dependency",
+ textToStr(textOf(hd(vs)))
+ EEND;
+ }
+ hd(vs) = depTypeVar(cclass(c).line,tyvars,textOf(hd(vs)));
+ }
+ }
+
+ if (cclass(c).arity==0) {
+ cclass(c).head = c;
+ } else {
+ Int args = cclass(c).arity - 1;
+ for (temp=cclass(c).head; args>0; temp=fun(temp), args--) {
+ arg(temp) = mkOffset(args);
+ }
+ arg(temp) = mkOffset(0);
+ fun(temp) = c;
}
- arg(temp) = mkOffset(0);
- fun(temp) = c;
- tcDeps = NIL; /* find dependents */
- map2Proc(depPredExp,cclass(c).line,tyvars,cclass(c).supers);
+ tcDeps = NIL; /* find dependents */
+ map2Over(depPredExp,cclass(c).line,tyvars,cclass(c).supers);
h98CheckCtxt(cclass(c).line,"class definition",FALSE,cclass(c).supers,NIL);
cclass(c).numSupers = length(cclass(c).supers);
cclass(c).defaults = extractBindings(cclass(c).members); /* defaults*/
tcDeps = NIL;
}
-static Void local depPredExp(line,tyvars,pred)
+static Cell local depPredExp(line,tyvars,pred)
Int line;
List tyvars;
Cell pred; {
- Int args = 1; /* parser guarantees >=1 args */
- Cell h = fun(pred);
+ Int args = 0;
+ Cell prev = NIL;
+ Cell h = pred;
for (; isAp(h); args++) {
- arg(pred) = depTypeExp(line,tyvars,arg(pred));
- pred = h;
- h = fun(pred);
+ arg(h) = depTypeExp(line,tyvars,arg(h));
+ prev = h;
+ h = fun(h);
+ }
+
+ if (args==0) {
+ h98DoesntSupport(line,"tag classes");
+ } else if (args!=1) {
+ h98DoesntSupport(line,"multiple parameter classes");
}
- arg(pred) = depTypeExp(line,tyvars,arg(pred));
- if (args!=1)
- h98DoesntSupport(line,"multiple parameter classes");
if (isQCon(h)) { /* standard class constraint */
Class c = findQualClass(h);
ERRMSG(line) "Undefined class \"%s\"", identToStr(h)
EEND;
}
- fun(pred) = c;
+ if (isNull(prev)) {
+ pred = c;
+ } else {
+ fun(prev) = c;
+ }
if (args!=cclass(c).arity) {
ERRMSG(line) "Wrong number of arguments for class \"%s\"",
textToStr(cclass(c).text)
}
}
#endif
- else { /* check for other kinds of pred */
- internal("depPredExp"); /* ... but there aren't any! */
+ else
+#if IPARAM
+ if (whatIs(h) != IPCELL)
+#endif
+ {
+ internal("depPredExp");
}
+ return pred;
}
static Void local checkMems(c,tyvars,m) /* check member function details */
Type t = thd3(m);
List sig = NIL;
List tvs = NIL;
+ List xtvs = NIL;
+
+ if (isPolyType(t)) {
+ xtvs = fst(snd(t));
+ t = monotypeOf(t);
+ }
+
- tyvars = typeVarsIn(t,NIL,tyvars);/* Look for extra type vars. */
+ tyvars = typeVarsIn(t,NIL,xtvs,tyvars);
+ /* Look for extra type vars. */
+ checkOptQuantVars(line,xtvs,tyvars);
- if (whatIs(t)==QUAL) { /* Overloaded member signatures? */
- map2Proc(depPredExp,line,tyvars,fst(snd(t)));
+ if (isQualType(t)) { /* Overloaded member signatures? */
+ map2Over(depPredExp,line,tyvars,fst(snd(t)));
} else {
t = ap(QUAL,pair(NIL,t));
}
for (tvs=tyvars; nonNull(tvs); tvs=tl(tvs)){/* Quantify */
sig = ap(NIL,sig);
}
- t = mkPolyType(sig,t);
+ if (nonNull(sig)) {
+ t = mkPolyType(sig,t);
+ }
thd3(m) = t; /* Save type */
take(cclass(c).arity,tyvars); /* Delete extra type vars */
if (mno==1) { /* Single entry dicts use newtype */
name(cclass(c).dcon).defn = nameId;
- name(hd(cclass(c).members)).number = mfunNo(0);
+ if (nonNull(cclass(c).members)) {
+ name(hd(cclass(c).members)).number = mfunNo(0);
+ }
}
- cclass(c).dbuild = newDBuild(c);
cclass(c).defaults = classBindings("class",c,cclass(c).defaults);
}
return s;
}
-static Name local newDBuild(c) /* Make definition for builder */
-Class c; {
- Name b = newName(generateText("class.%s",c),c);
- name(b).line = cclass(c).line;
- name(b).arity = cclass(c).numSupers+1;
- return b;
-}
-
#define MAX_GEN 128
static Text local generateText(sk,c) /* We need to generate names for */
* occur in the type expression when read from left to right.
* ------------------------------------------------------------------------*/
-List typeVarsIn(ty,us,vs) /* Calculate list of type variables*/
-Cell ty; /* used in type expression, reading*/
-List us; /* from left to right ignoring any */
-List vs; { /* listed in us. */
+static List local typeVarsIn(ty,us,ws,vs)/*Calculate list of type variables*/
+Cell ty; /* used in type expression, reading*/
+List us; /* from left to right ignoring any */
+List ws; /* listed in us. */
+List vs; { /* ws = explicitly quantified vars */
switch (whatIs(ty)) {
- case AP : return typeVarsIn(snd(ty),us,
- typeVarsIn(fst(ty),us,vs));
+ case AP : return typeVarsIn(snd(ty),us,ws,
+ typeVarsIn(fst(ty),us,ws,vs));
- case VARIDCELL :
- case VAROPCELL : if (nonNull(findBtyvs(textOf(ty)))
- || varIsMember(textOf(ty),us)) {
- return vs;
- } else {
- return maybeAppendVar(ty,vs);
- }
+ case VARIDCELL :
+ case VAROPCELL : if ((nonNull(findBtyvs(textOf(ty)))
+ && !varIsMember(textOf(ty),ws))
+ || varIsMember(textOf(ty),us)) {
+ return vs;
+ } else {
+ return maybeAppendVar(ty,vs);
+ }
- case POLYTYPE : return typeVarsIn(monotypeOf(ty),polySigOf(ty),vs);
+ case POLYTYPE : return typeVarsIn(monotypeOf(ty),polySigOf(ty),ws,vs);
- case QUAL : { List qs = fst(snd(ty));
- for (; nonNull(qs); qs=tl(qs)) {
- vs = typeVarsIn(hd(qs),us,vs);
- }
- return typeVarsIn(snd(snd(ty)),us,vs);
- }
+ case QUAL : { vs = typeVarsIn(fst(snd(ty)),us,ws,vs);
+ return typeVarsIn(snd(snd(ty)),us,ws,vs);
+ }
- case BANG : return typeVarsIn(snd(ty),us,vs);
+ case BANG : return typeVarsIn(snd(ty),us,ws,vs);
- case LABC : { List fs = snd(snd(ty));
- for (; nonNull(fs); fs=tl(fs)) {
- vs = typeVarsIn(snd(hd(fs)),us,vs);
- }
- return vs;
- }
+ case LABC : { List fs = snd(snd(ty));
+ for (; nonNull(fs); fs=tl(fs)) {
+ vs = typeVarsIn(snd(hd(fs)),us,ws,vs);
+ }
+ return vs;
+ }
}
return vs;
}
String where; /* explicit type signature */
Cell e;
Type type; {
- List tvs = typeVarsIn(type,NIL,NIL);
- Int n = length(tvs);
- List sunk = unkindTypes;
+ List tvs = NIL;
+ List sunk = NIL;
+ List xtvs = NIL;
+
+ if (isPolyType(type)) {
+ xtvs = fst(snd(type));
+ type = monotypeOf(type);
+ }
+ tvs = typeVarsIn(type,NIL,xtvs,NIL);
+ sunk = unkindTypes;
+ checkOptQuantVars(line,xtvs,tvs);
- if (whatIs(type)==QUAL) {
- map2Proc(depPredExp,line,tvs,fst(snd(type)));
- snd(snd(type)) = depTopType(line,tvs,snd(snd(type)));
+ if (isQualType(type)) {
+ map2Over(depPredExp,line,tvs,fst(snd(type)));
+ snd(snd(type)) = depTopType(line,tvs,snd(snd(type)));
if (isAmbiguous(type)) {
ambigError(line,where,e,type);
type = depTopType(line,tvs,type);
}
- if (n>0) {
- if (n>=NUM_OFFSETS) {
+ if (nonNull(tvs)) {
+ if (length(tvs)>=NUM_OFFSETS) {
ERRMSG(line) "Too many type variables in %s\n", where
EEND;
} else {
return type;
}
+static Void local checkOptQuantVars(line,xtvs,tvs)
+Int line;
+List xtvs; /* Explicitly quantified vars */
+List tvs; { /* Implicitly quantified vars */
+ if (nonNull(xtvs)) {
+ List vs = tvs;
+ for (; nonNull(vs); vs=tl(vs)) {
+ if (!varIsMember(textOf(hd(vs)),xtvs)) {
+ ERRMSG(line) "Quantifier does not mention type variable \"%s\"",
+ textToStr(textOf(hd(vs)))
+ EEND;
+ }
+ }
+ for (vs=xtvs; nonNull(vs); vs=tl(vs)) {
+ if (!varIsMember(textOf(hd(vs)),tvs)) {
+ ERRMSG(line) "Quantified type variable \"%s\" is not used",
+ textToStr(textOf(hd(vs)))
+ EEND;
+ }
+ if (varIsMember(textOf(hd(vs)),tl(vs))) {
+ ERRMSG(line) "Quantified type variable \"%s\" is repeated",
+ textToStr(textOf(hd(vs)))
+ EEND;
+ }
+ }
+ }
+}
+
static Type local depTopType(l,tvs,t) /* Check top-level of type sig */
Int l;
List tvs;
Int i = 1;
for (; getHead(t1)==typeArrow && argCount==2; ++i) {
arg(fun(t1)) = depCompType(l,tvs,arg(fun(t1)));
- if (isPolyType(arg(fun(t1)))) {
+ if (isPolyOrQualType(arg(fun(t1)))) {
nr2 = i;
}
prev = t1;
Int l;
List tvs;
Type t; {
- if (isPolyType(t)) {
- Int ntvs = length(tvs);
- List nfr = NIL;
- if (isPolyType(t)) {
- List vs = fst(snd(t));
- t = monotypeOf(t);
- tvs = checkQuantVars(l,vs,tvs,t);
- nfr = replicate(length(vs),NIL);
- }
- if (whatIs(t)==QUAL) {
- map2Proc(depPredExp,l,tvs,fst(snd(t)));
- snd(snd(t)) = depTypeExp(l,tvs,snd(snd(t)));
- if (isAmbiguous(t)) {
- ambigError(l,"type component",NIL,t);
- }
- } else {
- t = depTypeExp(l,tvs,t);
- }
- if (isNull(nfr)) {
- return t;
- }
- take(ntvs,tvs);
- return mkPolyType(nfr,t);
- } else {
- return depTypeExp(l,tvs,t);
+ Int ntvs = length(tvs);
+ List nfr = NIL;
+ if (isPolyType(t)) {
+ List vs = fst(snd(t));
+ t = monotypeOf(t);
+ tvs = checkQuantVars(l,vs,tvs,t);
+ nfr = replicate(length(vs),NIL);
+ }
+ if (isQualType(t)) {
+ map2Over(depPredExp,l,tvs,fst(snd(t)));
+ snd(snd(t)) = depTypeExp(l,tvs,snd(snd(t)));
+ if (isAmbiguous(t)) {
+ ambigError(l,"type component",NIL,t);
}
+ } else {
+ t = depTypeExp(l,tvs,t);
+ }
+ if (isNull(nfr)) {
+ return t;
+ }
+ take(ntvs,tvs);
+ return mkPolyType(nfr,t);
}
static Type local depTypeExp(line,tyvars,type)
Int line;
List tyvars;
Text tv; {
- Int offset = 0;
- Cell vt = findBtyvs(tv);
+ Int offset = 0;
+ Int found = (-1);
- if (nonNull(vt)) {
- return fst(vt);
+ for (; nonNull(tyvars); offset++) {
+ if (tv==textOf(hd(tyvars))) {
+ found = offset;
+ }
+ tyvars = tl(tyvars);
}
- for (; nonNull(tyvars) && tv!=textOf(hd(tyvars)); offset++) {
- tyvars = tl(tyvars);
- }
- if (isNull(tyvars)) {
- ERRMSG(line) "Undefined type variable \"%s\"", textToStr(tv)
- EEND;
+ if (found<0) {
+ Cell vt = findBtyvs(tv);
+ if (nonNull(vt)) {
+ return fst(vt);
+ }
+ ERRMSG(line) "Undefined type variable \"%s\"", textToStr(tv)
+ EEND;
}
- return mkOffset(offset);
+ return mkOffset(found);
}
static List local checkQuantVars(line,vs,tvs,body)
List tvs; /* variables already in scope */
Cell body; { /* type/constr for scope of vars */
if (nonNull(vs)) {
- List bvs = typeVarsIn(body,NIL,NIL);
+ List bvs = typeVarsIn(body,NIL,NIL,NIL);
List us = vs;
for (; nonNull(us); us=tl(us)) {
Text u = textOf(hd(us));
textToStr(u)
EEND;
}
+#if 0
if (varIsMember(u,tvs)) {
ERRMSG(line) "Local quantifier for %s hides an outer use",
textToStr(u)
EEND;
}
+#endif
if (!varIsMember(u,bvs)) {
ERRMSG(line) "Locally quantified variable %s is not used",
textToStr(u)
}
}
-Bool isAmbiguous(type) /* Determine whether type is */
-Type type; { /* ambiguous */
+List zonkTyvarsIn(t,vs)
+Type t;
+List vs; {
+ switch (whatIs(t)) {
+ case AP : return zonkTyvarsIn(fun(t),
+ zonkTyvarsIn(arg(t),vs));
+
+ case INTCELL : if (cellIsMember(t,vs))
+ return vs;
+ else
+ return cons(t,vs);
+
+ case OFFSET : internal("zonkTyvarsIn");
+
+ default : return vs;
+ }
+}
+
+static List local otvars(pi,os) /* os is a list of offsets that */
+Cell pi; /* refer to the arguments of pi; */
+List os; { /* find list of offsets in those */
+ List us = NIL; /* positions */
+ for (; nonNull(os); os=tl(os)) {
+ us = offsetTyvarsIn(nthArg(offsetOf(hd(os)),pi),us);
+ }
+ return us;
+}
+
+static List local otvarsZonk(pi,os,o) /* same as above, but zonks */
+Cell pi;
+List os; {
+ List us = NIL;
+ List vs = NIL;
+ for (; nonNull(os); os=tl(os)) {
+ Type t = zonkType(nthArg(offsetOf(hd(os)),pi),o);
+ us = zonkTyvarsIn(t,us);
+ }
+ return us;
+}
+
+static Bool local odiff(us,vs)
+List us, vs; {
+ while (nonNull(us) && cellIsMember(hd(us),vs)) {
+ us = tl(us);
+ }
+ return us;
+}
+
+static Bool local osubset(us,vs) /* Determine whether us is subset */
+List us, vs; { /* of vs */
+ while (nonNull(us) && cellIsMember(hd(us),vs)) {
+ us = tl(us);
+ }
+ return isNull(us);
+}
+
+List oclose(fds,vs) /* Compute closure of vs wrt to fds*/
+List fds;
+List vs; {
+ Bool changed = TRUE;
+ while (changed) {
+ List fds1 = NIL;
+ changed = FALSE;
+ while (nonNull(fds)) {
+ Cell fd = hd(fds);
+ List next = tl(fds);
+ if (osubset(fst(fd),vs)) { /* Test if fd applies */
+ List os = snd(fd);
+ for (; nonNull(os); os=tl(os)) {
+ if (!cellIsMember(hd(os),vs)) {
+ vs = cons(hd(os),vs);
+ changed = TRUE;
+ }
+ }
+ } else { /* Didn't apply this time, so keep */
+ tl(fds) = fds1;
+ fds1 = fds;
+ }
+ fds = next;
+ }
+ fds = fds1;
+ }
+ return vs;
+}
+
+Bool isAmbiguous(type) /* Determine whether type is */
+Type type; { /* ambiguous */
if (isPolyType(type)) {
- type = monotypeOf(type);
+ type = monotypeOf(type);
}
- if (whatIs(type)==QUAL) { /* only qualified types can be */
- List tvps = offsetTyvarsIn(fst(snd(type)),NIL); /* ambiguous */
- List tvts = offsetTyvarsIn(snd(snd(type)),NIL);
- while (nonNull(tvps) && cellIsMember(hd(tvps),tvts)) {
- tvps = tl(tvps);
- }
- return nonNull(tvps);
+ if (isQualType(type)) { /* only qualified types can be */
+ List ps = fst(snd(type)); /* ambiguous */
+ List tvps = offsetTyvarsIn(ps,NIL);
+ List tvts = offsetTyvarsIn(snd(snd(type)),NIL);
+ List fds = calcFunDeps(ps);
+
+ tvts = oclose(fds,tvts); /* Close tvts under fds */
+ return !osubset(tvps,tvts);
}
return FALSE;
}
+List calcFunDeps(ps)
+List ps; {
+ List fds = NIL;
+ for (; nonNull(ps); ps=tl(ps)) {/* Calc functional dependencies */
+ Cell pi = hd(ps);
+ Cell c = getHead(pi);
+ if (isClass(c)) {
+ List fs = cclass(c).fds;
+ for (; nonNull(fs); fs=tl(fs)) {
+ fds = cons(pair(otvars(pi,fst(hd(fs))),
+ otvars(pi,snd(hd(fs)))),fds);
+ }
+ }
+#if IPARAM
+ else if (isIP(c)) {
+ fds = cons(pair(NIL,offsetTyvarsIn(arg(pi),NIL)),fds);
+ }
+#endif
+ }
+ return fds;
+}
+
+List calcFunDepsPreds(ps)
+List ps; {
+ List fds = NIL;
+ for (; nonNull(ps); ps=tl(ps)) {/* Calc functional dependencies */
+ Cell pi3 = hd(ps);
+ Cell pi = fst3(pi3);
+ Cell c = getHead(pi);
+ Int o = intOf(snd3(pi3));
+ if (isClass(c)) {
+ List fs = cclass(c).fds;
+ for (; nonNull(fs); fs=tl(fs)) {
+ fds = cons(pair(otvarsZonk(pi,fst(hd(fs)),o),
+ otvarsZonk(pi,snd(hd(fs)),o)),fds);
+ }
+ }
+#if IPARAM
+ else if (isIP(c)) {
+ fds = cons(pair(NIL,zonkTyvarsIn(arg(pi),NIL)),fds);
+ }
+#endif
+ }
+ return fds;
+}
+
Void ambigError(line,where,e,type) /* produce error message for */
Int line; /* ambiguity */
String where;
Int m;
Cell pi; {
#if TREX
- if (isExt(fun(pi))) {
+ if (isAp(pi) && isExt(fun(pi))) {
static String lackspred = "lacks predicate";
checkKind(l,alpha,m,arg(pi),NIL,lackspred,ROW,0);
return;
}
#endif
+#if IPARAM
+ if (isAp(pi) && whatIs(fun(pi)) == IPCELL) {
+ static String ippred = "iparam predicate";
+ checkKind(l,alpha,m,arg(pi),NIL,ippred,STAR,0);
+ return;
+ }
+#endif
{ static String predicate = "class constraint";
Class c = getHead(pi);
List as = getArgs(pi);
Int n = cclass(c).arity;
Int beta = newKindvars(n);
cclass(c).kinds = NIL;
- do {
+ while (n>0) {
n--;
cclass(c).kinds = pair(mkInt(beta+n),cclass(c).kinds);
- } while (n>0);
+ }
}
}
switch (whatIs(tycon(c).what)) {
case NEWTYPE :
case DATATYPE : { List cs = tycon(c).defn;
- if (whatIs(cs)==QUAL) {
+ if (isQualType(cs)) {
map3Proc(kindPred,line,beta,m,
fst(snd(cs)));
tycon(c).defn = cs = snd(snd(cs));
static Void local checkInstDefn(in) /* Validate instance declaration */
Inst in; {
Int line = inst(in).line;
- List tyvars = typeVarsIn(inst(in).head,NIL,NIL);
+ List tyvars = typeVarsIn(inst(in).head,NIL,NIL,NIL);
+ List tvps = NIL, tvts = NIL;
+ List fds = NIL;
if (haskell98) { /* Check for `simple' type */
List tvs = NIL;
}
}
- depPredExp(line,tyvars,inst(in).head);
+ /* add in the tyvars from the `specifics' so that we don't
+ prematurely complain about undefined tyvars */
+ tyvars = typeVarsIn(inst(in).specifics,NIL,NIL,tyvars);
+ inst(in).head = depPredExp(line,tyvars,inst(in).head);
if (haskell98) {
Type h = getHead(arg(inst(in).head));
}
}
- map2Proc(depPredExp,line,tyvars,inst(in).specifics);
+ map2Over(depPredExp,line,tyvars,inst(in).specifics);
+
+ /* OK, now we start over, and test for ambiguity */
+ tvts = offsetTyvarsIn(inst(in).head,NIL);
+ tvps = offsetTyvarsIn(inst(in).specifics,NIL);
+ fds = calcFunDeps(inst(in).specifics);
+ tvts = oclose(fds,tvts);
+ tvts = odiff(tvps,tvts);
+ if (!isNull(tvts)) {
+ ERRMSG(line) "Undefined type variable \"%s\"",
+ textToStr(textOf(nth(offsetOf(hd(tvts)),tyvars)))
+ EEND;
+ }
+
h98CheckCtxt(line,"instance definition",FALSE,inst(in).specifics,NIL);
inst(in).numSpecifics = length(inst(in).specifics);
inst(in).c = getHead(inst(in).head);
List ins = cclass(c).instances;
List prev = NIL;
+ if (nonNull(cclass(c).fds)) { /* Check for conflicts with fds */
+ List ins1 = cclass(c).instances;
+ for (; nonNull(ins1); ins1=tl(ins1)) {
+ List fds = cclass(c).fds;
+ substitution(RESET);
+ for (; nonNull(fds); fds=tl(fds)) {
+ Int alpha = newKindedVars(inst(in).kinds);
+ Int beta = newKindedVars(inst(hd(ins1)).kinds);
+ List as = fst(hd(fds));
+ Bool same = TRUE;
+ for (; same && nonNull(as); as=tl(as)) {
+ Int n = offsetOf(hd(as));
+ same &= unify(nthArg(n,inst(in).head),alpha,
+ nthArg(n,inst(hd(ins1)).head),beta);
+ }
+ if (isNull(as) && same) {
+ for (as=snd(hd(fds)); same && nonNull(as); as=tl(as)) {
+ Int n = offsetOf(hd(as));
+ same &= sameType(nthArg(n,inst(in).head),alpha,
+ nthArg(n,inst(hd(ins1)).head),beta);
+ }
+ if (!same) {
+ ERRMSG(inst(in).line)
+ "Instances are not consistent with dependencies"
+ ETHEN
+ ERRTEXT "\n*** This instance : "
+ ETHEN ERRPRED(inst(in).head);
+ ERRTEXT "\n*** Conflicts with : "
+ ETHEN ERRPRED(inst(hd(ins)).head);
+ ERRTEXT "\n*** For class : "
+ ETHEN ERRPRED(cclass(c).head);
+ ERRTEXT "\n*** Under dependency : "
+ ETHEN ERRFD(hd(fds));
+ ERRTEXT "\n"
+ EEND;
+ }
+ }
+ }
+ }
+ }
+
+
substitution(RESET);
while (nonNull(ins)) { /* Look for overlap w/ other insts */
Int alpha = newKindedVars(inst(in).kinds);
continue;
}
}
+#if MULTI_INST
+ if (multiInstRes && nonNull(inst(in).specifics)) {
+ break;
+ } else {
+#endif
ERRMSG(inst(in).line) "Overlapping instances for class \"%s\"",
textToStr(cclass(c).text)
ETHEN
ERRTEXT "\n"
EEND;
}
+#if MULTI_INST
+ }
+#endif
prev = ins; /* No overlap detected, so move on */
ins = tl(ins); /* to next instance */
}
List ts; /* and named class ct */
Cell ct; {
Int line = tycon(t).line;
- Class c = findClass(textOf(ct));
+ Class c = findQualClass(ct);
if (isNull(c)) {
ERRMSG(line) "Unknown class \"%s\" in derived instance",
- textToStr(textOf(ct))
+ identToStr(ct)
EEND;
}
addDerInst(line,c,p,dupList(ts),t,tycon(t).arity);
List ps = snd(snd(inst(in).specifics));
List spcs = fst(snd(inst(in).specifics));
Int beta = inst(in).numSpecifics;
+ Int its = 1;
#ifdef DEBUG_DERIVING
Printf("calcInstPreds: ");
while (nonNull(ps)) {
Cell p = hd(ps);
ps = tl(ps);
+ if (its++ >= cutoff) {
+ Cell bpi = inst(in).head;
+ Cell pi = copyPred(fun(p),intOf(snd(p)));
+ ERRMSG(inst(in).line) "\n*** Cannot derive " ETHEN ERRPRED(bpi);
+ ERRTEXT " after %d iterations.", its-1 ETHEN
+ ERRTEXT
+ "\n*** This may indicate that the problem is undecidable. However,\n"
+ ETHEN ERRTEXT
+ "*** you may still try to increase the cutoff limit using the -c\n"
+ ETHEN ERRTEXT
+ "*** option and then try again. (The current setting is -c%d)\n",
+ cutoff
+ EEND;
+ }
if (isInt(fst(p))) { /* Delayed substitution? */
List qs = snd(p);
for (; nonNull(hd(qs)); qs=tl(qs)) {
String wh;
Cell e;
Type t; {
- List tvs = typeVarsIn(t,NIL,NIL);
+ List tvs = typeVarsIn(t,NIL,NIL,NIL);
h98DoesntSupport(l,"pattern type annotations");
for (; nonNull(tvs); tvs=tl(tvs)) {
Int beta = newKindvars(1);
hd(btyvars) = cons(pair(hd(tvs),mkInt(beta)), hd(btyvars));
}
t = checkSigType(l,"pattern type",e,t);
- if (isPolyType(t) || whatIs(t)==QUAL || whatIs(t)==RANK2) {
+ if (isPolyOrQualType(t) || whatIs(t)==RANK2) {
ERRMSG(l) "Illegal syntax in %s type annotation", wh
EEND;
}
break;
#endif
+#if IPARAM
+ case IPVAR :
+#endif
+
case NAME :
case TUPLE :
case STRCELL :
case UPDFLDS : depUpdFlds(line,e);
break;
+#if IPARAM
+ case WITHEXP : depWith(line,e);
+ break;
+#endif
+
case ASPAT : ERRMSG(line) "Illegal `@' in expression"
EEND;
if (isPolyType(t)) { /* Find tycon that c belongs to */
t = monotypeOf(t);
}
- if (whatIs(t)==QUAL) {
+ if (isQualType(t)) {
t = snd(snd(t));
}
if (whatIs(t)==CDICTS) {
return cs;
}
+#if IPARAM
+static Void local depWith(line,e) /* check with using fields */
+Int line;
+Cell e; {
+ fst(snd(e)) = depExpr(line,fst(snd(e)));
+ snd(snd(e)) = depDwFlds(line,e,snd(snd(e)));
+}
+
+static List local depDwFlds(l,e,fs)/* check field binding list */
+Int l;
+Cell e;
+List fs;
+{
+ Cell c = fs;
+ for (; nonNull(c); c=tl(c)) { /* for each field binding */
+ snd(hd(c)) = depExpr(l,snd(hd(c)));
+ }
+ return fs;
+}
+#endif
+
#if TREX
static Cell local depRecord(line,e) /* find dependents of record and */
Int line; /* sort fields into approp. order */
staticAnalysis(RESET);
}
+Void checkContext() { /* Top level static check on Expr */
+ List vs, qs;
+
+ staticAnalysis(RESET);
+ clearScope(); /* Analyse expression in the scope */
+ withinScope(NIL); /* of no local bindings */
+ qs = inputContext;
+ for (vs = NIL; nonNull(qs); qs=tl(qs)) {
+ vs = typeVarsIn(hd(qs),NIL,NIL,vs);
+ }
+ map2Proc(depPredExp,0,vs,inputContext);
+ leaveScope();
+ staticAnalysis(RESET);
+}
+
Void checkDefns() { /* Top level static analysis */
Module thisModule = lastModule();
staticAnalysis(RESET);
mapProc(checkInstDefn,instDefns);
setCurrModule(thisModule);
+ mapProc(addRSsigdecls,typeInDefns); /* add sigdecls for RESTRICTSYN */
+ valDefns = eqnsToBindings(valDefns,tyconDefns,classDefns,/*primDefns*/NIL);
+ mapProc(allNoPrevDef,valDefns); /* check against previous defns */
mapProc(addDerivImp,derivedInsts); /* Add impls for derived instances */
deriveContexts(derivedInsts); /* Calculate derived inst contexts */
instDefns = appendOnto(instDefns,derivedInsts);
checkDefaultDefns(); /* validate default definitions */
- mapProc(addRSsigdecls,typeInDefns); /* add sigdecls for RESTRICTSYN */
- valDefns = eqnsToBindings(valDefns,tyconDefns,classDefns, NIL/*primDefns*/ );
- tyconDefns = NIL;
-
mapProc(allNoPrevDef,valDefns); /* check against previous defns */
linkPreludeNames();
staticAnalysis(RESET);
}
+
+
+
static Void local addRSsigdecls(pr) /* add sigdecls from TYPE ... IN ..*/
Pair pr; {
List vs = snd(pr); /* get list of variables */
Type ty = t;
if (isPolyType(t))
t = monotypeOf(t);
- if (whatIs(t)==QUAL) {
+ if (isQualType(t)) {
Cell pi = h98Context(TRUE,fst(snd(t)));
if (nonNull(pi)) {
ERRMSG(line) "Illegal Haskell 98 class constraint in %s",wh
projects / ghc-hetmet.git / blobdiff