* included in the distribution.
*
* $RCSfile: static.c,v $
- * $Revision: 1.12 $
- * $Date: 1999/10/19 12:05:27 $
+ * $Revision: 1.28 $
+ * $Date: 2000/03/10 14:53:00 $
* ------------------------------------------------------------------------*/
#include "prelude.h"
static List local checkExportTycon Args((List,Text,Cell,Tycon));
static List local checkExportClass Args((List,Text,Cell,Class));
static List local checkExport Args((List,Text,Cell));
-static List local checkImportEntity Args((List,Module,Cell));
-static List local resolveImportList Args((Module,Cell));
+static List local checkImportEntity Args((List,Module,Bool,Cell));
+static List local resolveImportList Args((Module,Cell,Bool));
static Void local checkImportList Args((Pair));
static Void local importEntity Args((Module,Cell));
static Void local checkClassDefn Args((Class));
static Cell local depPredExp Args((Int,List,Cell));
static Void local checkMems Args((Class,List,Cell));
+static Void local checkMems2 Args((Class,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 Text local generateText Args((String,Class));
-static Int local visitClass Args((Class));
static List local classBindings Args((String,Class,List));
static Name local memberName Args((Class,Text));
static List local numInsert Args((Int,Cell,List));
- List local typeVarsIn Args((Cell,List,List,List));
static List local maybeAppendVar Args((Cell,List));
static Type local checkSigType Args((Int,String,Cell,Type));
return imports;
}
-static List local checkImportEntity(imports,exporter,entity)
+static List local checkImportEntity(imports,exporter,priv,entity)
List imports; /* Accumulated list of things to import */
Module exporter;
-Cell entity; { /* Entry from import list */
+Bool priv;
+Cell entity; { /* Entry from import list */
List oldImports = imports;
Text t = isIdent(entity) ? textOf(entity) : textOf(fst(entity));
- List es = module(exporter).exports;
+ List es = NIL;
+ if (priv) {
+ es = module(exporter).names;
+ es = dupOnto(module(exporter).tycons,es);
+ es = dupOnto(module(exporter).classes,es);
+ } else {
+ es = module(exporter).exports;
+ }
+
for(; nonNull(es); es=tl(es)) {
- Cell e = hd(es); /* :: Entity | (Entity, NIL|DOTDOT) */
+ Cell e = hd(es); /* :: Entity
+ | (Entity, NIL|DOTDOT)
+ | tycon
+ | class
+ */
if (isPair(e)) {
Cell f = fst(e);
if (isTycon(f)) {
if (isIdent(entity) && name(e).text == t) {
imports = cons(e,imports);
}
+ } else if (isTycon(e) && priv) {
+ if (tycon(e).text == t) {
+ imports = cons(e,imports);
+ return dupOnto(tycon(e).defn,imports);
+ }
+ } else if (isClass(e) && priv) {
+ if (cclass(e).text == t) {
+ imports = cons(e,imports);
+ return dupOnto(cclass(e).members,imports);
+ }
+ } else if (whatIs(e) == TUPLE && priv) {
+ // do nothing
} else {
internal("checkImportEntity3");
}
return imports;
}
-static List local resolveImportList(m,impList)
+static List local resolveImportList(m,impList,priv)
Module m; /* exporting module */
-Cell impList; {
+Cell impList;
+Bool priv; {
List imports = NIL;
if (DOTDOT == impList) {
List es = module(m).exports;
}
}
} else {
- map1Accum(checkImportEntity,imports,m,impList);
+ map2Accum(checkImportEntity,imports,m,priv,impList);
}
return imports;
}
/* Somewhat inefficient - but obviously correct:
* imports = importsOf("module Foo") `setDifference` hidden;
*/
- hidden = resolveImportList(m, snd(impList));
- imports = resolveImportList(m, DOTDOT);
+ hidden = resolveImportList(m, snd(impList),FALSE);
+ imports = resolveImportList(m, DOTDOT,FALSE);
+ } else if (isPair(impList) && STAR == fst(impList)) {
+ List privileged;
+ imports = resolveImportList(m, DOTDOT, FALSE);
+ privileged = resolveImportList(m, snd(impList),TRUE);
+ imports = dupOnto(privileged,imports);
} else {
- imports = resolveImportList(m, impList);
+ imports = resolveImportList(m, impList,FALSE);
}
+
for(; nonNull(imports); imports=tl(imports)) {
Cell e = hd(imports);
if (!cellIsMember(e,hidden))
switch (whatIs(e)) {
case NAME : importName(source,e);
break;
+ case TUPLE:
case TYCON : importTycon(source,e);
break;
case CLASS : importClass(source,e);
con = ty;
}
- if (nr2>0) /* Add rank 2 annotation */
- type = ap(RANK2,pair(mkInt(nr2),type));
+ if (nr2>0) { /* Add rank 2 annotation */
+ type = ap(RANK2,pair(mkInt(nr2-length(lps)),type));
+ }
if (nonNull(evs)) { /* Add existential annotation */
if (nonNull(derivs)) {
cclass(nw).members = ms;
cclass(nw).level = 0;
cclass(nw).fds = fds;
+ cclass(nw).xfds = NIL;
classDefns = cons(nw,classDefns);
if (arity!=1)
h98DoesntSupport(line,"multiple parameter classes");
/* Check for trivial dependency
*/
- if (isNull(snd(fd))) {
+ if (isNull(vs)) {
ERRMSG(cclass(c).line) "Functional dependency is trivial"
EEND;
}
tcDeps = NIL;
}
+
+/* --------------------------------------------------------------------------
+ * Functional dependencies are inherited from superclasses.
+ * For example, if I've got the following classes:
+ *
+ * class C a b | a -> b
+ * class C [b] a => D a b
+ *
+ * then C will have the dependency ([a], [b]) as expected, and D will inherit
+ * the dependency ([b], [a]) from C.
+ * When doing pairwise improvement, we have to consider not just improving
+ * when we see a pair of Cs or a pair of Ds in the context, but when we've
+ * got a C and a D as well. In this case, we only improve when the
+ * predicate in question matches the type skeleton in the relevant superclass
+ * constraint. E.g., we improve the pair (C [Int] a, D b Int) (unifying
+ * a and b), but we don't improve the pair (C Int a, D b Int).
+ * To implement functional dependency inheritance, we calculate
+ * the closure of all functional dependencies, and store the result
+ * in an additional field `xfds' (extended functional dependencies).
+ * The `xfds' field is a list of functional dependency lists, annotated
+ * with a list of predicate skeletons constraining when improvement can
+ * happen against this dependency list. For example, the xfds field
+ * for C above would be:
+ * [([C a b], [([a], [b])])]
+ * and the xfds field for D would be:
+ * [([C [b] a, D a b], [([b], [a])])]
+ * Self-improvement (of a C with a C, or a D with a D) is treated as a
+ * special case of an inherited dependency.
+ * ------------------------------------------------------------------------*/
+static List local inheritFundeps ( Class c, Cell pi, Int o )
+{
+ Int alpha = newKindedVars(cclass(c).kinds);
+ List scs = cclass(c).supers;
+ List xfds = NIL;
+ Cell this = NIL;
+ /* better not fail ;-) */
+ if (!matchPred(pi,o,cclass(c).head,alpha))
+ internal("inheritFundeps - predicate failed to match it's own head!");
+ this = copyPred(pi,o);
+ for (; nonNull(scs); scs=tl(scs)) {
+ Class s = getHead(hd(scs));
+ if (isClass(s)) {
+ List sfds = inheritFundeps(s,hd(scs),alpha);
+ for (; nonNull(sfds); sfds=tl(sfds)) {
+ Cell h = hd(sfds);
+ xfds = cons(pair(cons(this,fst(h)),snd(h)),xfds);
+ }
+ }
+ }
+ if (nonNull(cclass(c).fds)) {
+ List fds = NIL, fs = cclass(c).fds;
+ for (; nonNull(fs); fs=tl(fs)) {
+ fds = cons(pair(otvars(this,fst(hd(fs))),
+ otvars(this,snd(hd(fs)))),fds);
+ }
+ xfds = cons(pair(cons(this,NIL),fds),xfds);
+ }
+ return xfds;
+}
+
+static Void local extendFundeps ( Class c )
+{
+ Int alpha;
+ emptySubstitution();
+ alpha = newKindedVars(cclass(c).kinds);
+ cclass(c).xfds = inheritFundeps(c,cclass(c).head,alpha);
+
+ /* we can now check for ambiguity */
+ map1Proc(checkMems2,c,fst(cclass(c).members));
+}
+
+
static Cell local depPredExp(line,tyvars,pred)
Int line;
List tyvars;
h98CheckType(line,"member type",hd(vs),t);
}
+static Void local checkMems2(c,m) /* check member function details */
+Class c;
+Cell m; {
+ Int line = intOf(fst3(m));
+ List vs = snd3(m);
+ Type t = thd3(m);
+}
+
static Void local addMembers(c) /* Add definitions of member funs */
Class c; { /* and other parts of class struct.*/
List ms = fst(cclass(c).members);
*/
mno = cclass(c).numSupers + cclass(c).numMembers;
- cclass(c).dcon = addPrimCfun(generateText("Make.%s",c),mno,0,NIL);
- implementCfun(cclass(c).dcon,NIL); /* ADR addition */
+ /* cclass(c).dcon = addPrimCfun(generateText("Make.%s",c),mno,0,NIL); */
+ cclass(c).dcon = addPrimCfun(generateText(":D%s",c),mno,0,NIL);
+ /* implementCfun(cclass(c).dcon,NIL);
+ Don't manufacture a wrapper fn for dictionary constructors.
+ Applications of dictionary constructors are always saturated,
+ and translate.c:stgExpr() special-cases saturated constructor apps.
+ */
if (mno==1) { /* Single entry dicts use newtype */
name(cclass(c).dcon).defn = nameId;
name(m).arity = 1;
name(m).number = mfunNo(no);
name(m).type = t;
- name(m).inlineMe = TRUE;
return m;
}
-static Name local newDSel(c,no) /* Make definition for dict selectr*/
+Name newDSel(c,no) /* Make definition for dict selectr*/
Class c;
Int no; {
Name s;
char buf[16];
- sprintf(buf,"sc%d.%s",no,"%s");
+ /* sprintf(buf,"sc%d.%s",no,"%s"); */
+ sprintf(buf,"$p%d%s",no+1,"%s");
s = newName(generateText(buf,c),c);
name(s).line = cclass(c).line;
name(s).arity = 1;
return findText(buffer);
}
-static Int local visitClass(c) /* visit class defn to check that */
+ Int visitClass(c) /* visit class defn to check that */
Class c; { /* class hierarchy is acyclic */
#if TREX
if (isExt(c)) { /* special case for lacks preds */
List us; /* from left to right ignoring any */
List ws; /* listed in us. */
List vs; { /* ws = explicitly quantified vars */
+ if (isNull(ty)) return vs;
switch (whatIs(ty)) {
+ case DICTAP : return typeVarsIn(snd(snd(ty)),us,ws,vs);
+ case UNBOXEDTUP: return typeVarsIn(snd(ty),us,ws,vs);
+
case AP : return typeVarsIn(snd(ty),us,ws,
typeVarsIn(fst(ty),us,ws,vs));
}
return vs;
}
+ case TUPLE:
+ case TYCON:
+ case CONIDCELL:
+ case QUALIDENT: return vs;
+
+ default: fprintf(stderr, " bad tag = %d\n", whatIs(ty));internal("typeVarsIn");
}
- return vs;
+ assert(0);
}
static List local maybeAppendVar(v,vs) /* append variable to list if not */
else
return cons(t,vs);
- case OFFSET : internal("zonkTyvarsIn");
+ /* this case will lead to a type error --
+ much better than reporting an internal error ;-) */
+ /* case OFFSET : internal("zonkTyvarsIn"); */
default : return vs;
}
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);
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);
- }
+ List xfs = cclass(c).xfds;
+ for (; nonNull(xfs); xfs=tl(xfs)) {
+ List fs = snd(hd(xfs));
+ 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)) {
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);
+ List xfs = cclass(c).xfds;
+ for (; nonNull(xfs); xfs=tl(xfs)) {
+ List fs = snd(hd(xfs));
+ for (; nonNull(fs); fs=tl(fs)) {
+ fds = cons(pair(otvarsZonk(pi,fst(hd(fs)),o),
+ otvarsZonk(pi,snd(hd(fs)),o)),fds);
+ }
}
}
#if IPARAM
ERRMSG(line) "Illegal predicate in instance declaration"
EEND;
}
+
+ if (nonNull(cclass(inst(in).c).fds)) {
+ List fds = cclass(inst(in).c).fds;
+ for (; nonNull(fds); fds=tl(fds)) {
+ List as = otvars(inst(in).head, fst(hd(fds)));
+ List bs = otvars(inst(in).head, snd(hd(fds)));
+ List fs = calcFunDeps(inst(in).specifics);
+ as = oclose(fs,as);
+ if (!osubset(bs,as)) {
+ ERRMSG(inst(in).line)
+ "Instance is more general than a dependency allows"
+ ETHEN
+ ERRTEXT "\n*** Instance : "
+ ETHEN ERRPRED(inst(in).head);
+ ERRTEXT "\n*** For class : "
+ ETHEN ERRPRED(cclass(inst(in).c).head);
+ ERRTEXT "\n*** Under dependency : "
+ ETHEN ERRFD(hd(fds));
+ ERRTEXT "\n"
+ EEND;
+ }
+ }
+ }
+
kindInst(in,length(tyvars));
insertInst(in);
List spcs = fst(snd(inst(in).specifics));
Int beta = inst(in).numSpecifics;
Int its = 1;
+ Int factor = 1+length(ps);
#ifdef DEBUG_DERIVING
Printf("calcInstPreds: ");
while (nonNull(ps)) {
Cell p = hd(ps);
ps = tl(ps);
- if (its++ >= cutoff) {
+ if (its++ >= factor*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
* Foreign import declarations are Hugs' equivalent of GHC's ccall mechanism.
* They are used to "import" C functions into a module.
* They are usually not written by hand but, rather, generated automatically
- * by GreenCard, IDL compilers or whatever.
+ * by GreenCard, IDL compilers or whatever. We support foreign import
+ * (static) and foreign import dynamic. In the latter case, extName==NIL.
*
* Foreign export declarations generate C wrappers for Hugs functions.
* Hugs only provides "foreign export dynamic" because it's not obvious
* what "foreign export static" would mean in an interactive setting.
* ------------------------------------------------------------------------*/
-Void foreignImport(line,extName,intName,type) /* Handle foreign imports */
+Void foreignImport(line,callconv,extName,intName,type)
+ /* Handle foreign imports */
Cell line;
+Text callconv;
Pair extName;
Cell intName;
Cell type; {
ERRMSG(l) "Redeclaration of foreign \"%s\"", textToStr(t)
EEND;
}
- name(n).line = l;
- name(n).defn = extName;
- name(n).type = type;
- foreignImports = cons(n,foreignImports);
+ name(n).line = l;
+ name(n).defn = extName;
+ name(n).type = type;
+ name(n).callconv = callconv;
+ foreignImports = cons(n,foreignImports);
}
static Void local checkForeignImport(p) /* Check foreign import */
implementForeignImport(p);
}
-Void foreignExport(line,extName,intName,type)/* Handle foreign exports */
+Void foreignExport(line,callconv,extName,intName,type)
+ /* Handle foreign exports */
Cell line;
+Text callconv;
Cell extName;
Cell intName;
Cell type; {
ERRMSG(l) "Redeclaration of foreign \"%s\"", textToStr(t)
EEND;
}
- name(n).line = l;
- name(n).defn = NIL; /* nothing to say */
- name(n).type = type;
- foreignExports = cons(n,foreignExports);
+ name(n).line = l;
+ name(n).defn = NIL; /* nothing to say */
+ name(n).type = type;
+ name(n).callconv = callconv;
+ foreignExports = cons(n,foreignExports);
}
static Void local checkForeignExport(p) /* Check foreign export */
static Cell local checkMaybeCnkPat(l,p)/* Check applicative pattern with */
Int l; /* the possibility of n+k pattern */
Cell p; {
-#if NPLUSK
Cell h = getHead(p);
if (argCount==2 && isVar(h) && textOf(h)==textPlus) { /* n+k */
arg(p) = checkPat(l,v);
return p;
}
-#endif
return checkApPat(l,0,p);
}
staticAnalysis(RESET);
}
-Void checkContext() { /* Top level static check on Expr */
+#if EXPLAIN_INSTANCE_RESOLUTION
+Void checkContext(void) { /* Top level static check on Expr */
List vs, qs;
staticAnalysis(RESET);
leaveScope();
staticAnalysis(RESET);
}
+#endif
Void checkDefns() { /* Top level static analysis */
Module thisModule = lastModule();
}
mapProc(checkImportList, unqualImports);
- linkPreludeTC(); /* Get prelude tycons and classes */
+ /* Note: there's a lot of side-effecting going on here, so
+ don't monkey about with the order of operations here unless
+ you know what you are doing */
+ if (!combined) linkPreludeTC(); /* Get prelude tycons and classes */
+
mapProc(checkTyconDefn,tyconDefns); /* validate tycon definitions */
checkSynonyms(tyconDefns); /* check synonym definitions */
mapProc(checkClassDefn,classDefns); /* process class definitions */
mapProc(kindTCGroup,tcscc(tyconDefns,classDefns)); /* attach kinds */
+ mapProc(visitClass,classDefns); /* check class hierarchy */
+ mapProc(extendFundeps,classDefns); /* finish class definitions */
+ /* (convenient if we do this after */
+ /* calling `visitClass' so that we */
+ /* know the class hierarchy is */
+ /* acyclic) */
+
mapProc(addMembers,classDefns); /* add definitions for member funs */
- mapProc(visitClass,classDefns); /* check class hierarchy */
- linkPreludeCM(); /* Get prelude cfuns and mfuns */
+
+ if (!combined) linkPreludeCM(); /* Get prelude cfuns and mfuns */
instDefns = rev(instDefns); /* process instance definitions */
mapProc(checkInstDefn,instDefns);
mapProc(allNoPrevDef,valDefns); /* check against previous defns */
- linkPreludeNames();
+ if (!combined) linkPrimitiveNames(); /* link primitive names */
mapProc(checkForeignImport,foreignImports); /* check foreign imports */
mapProc(checkForeignExport,foreignExports); /* check foreign exports */
#endif
break;
- case INSTALL : staticAnalysis(RESET);
+ case POSTPREL: break;
+
+ case PREPREL : staticAnalysis(RESET);
#if TREX
extKind = pair(STAR,pair(ROW,ROW));
#endif
- break;
}
}
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