shithub: mc

ref: 0bd2678722f5f70a063190d54d12e62420f02b05
dir: /parse/type.c/

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#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <inttypes.h>
#include <ctype.h>
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include "parse.h"

typedef struct Typename Typename;
struct Typename {
    Ty ty;
    char *name;
};

Type **tytab = NULL;
Type **types = NULL;
size_t ntypes;
Trait **traittab;
size_t ntraittab;

/* Built in type constraints */
static Trait *traits[Ntypes + 1][4];
static int tybfmt(char *buf, size_t len, Type *t);

Type *mktype(Srcloc loc, Ty ty)
{
    Type *t;
    int i;

    /* the first 'n' types will be identity mapped: tytab[Tyint], eg,
     * will map to an instantitaion of Tyint.
     *
     * This is accomplished at program startup by calling mktype() on
     * each builtin type in order. As we do this, we put the type into
     * the table as ususal, which gives us an identity mapping.
     */
    if (ty <= Tyvalist && ty < ntypes)
        return types[ty];

    t = zalloc(sizeof(Type));
    t->type = ty;
    t->tid = ntypes++;
    t->loc = loc;
    tytab = xrealloc(tytab, ntypes*sizeof(Type*));
    tytab[t->tid] = NULL;
    types = xrealloc(types, ntypes*sizeof(Type*));
    types[t->tid] = t;
    if (ty <= Tyvalist) /* the last builtin atomic type */
        t->vis = Visbuiltin;

    for(i = 0; traits[ty][i]; i++)
        settrait(t, traits[ty][i]);

    return t;
}

/*
 * Shallowly duplicates a type, so we can frob
 * its internals later
 */
Type *tydup(Type *t)
{
    Type *r;

    r = mktype(t->loc, t->type);
    r->resolved = 0; /* re-resolving doesn't hurt */
    r->fixed = 0; /* re-resolving doesn't hurt */

    r->traits = bsdup(t->traits);
    r->traitlist = memdup(t->traitlist, t->ntraitlist * sizeof(Node*));
    r->ntraitlist = t->ntraitlist;

    r->arg = memdup(t->arg, t->narg * sizeof(Type*));
    r->narg = t->narg;
    r->inst = memdup(t->arg, t->narg * sizeof(Type*));
    r->ninst = t->ninst;

    r->sub = memdup(t->sub, t->nsub * sizeof(Type*));
    r->nsub = t->nsub;
    r->nmemb = t->nmemb;
    switch (t->type) {
        case Tyname:   	r->name = t->name;              break;
        case Tyunres:   r->name = t->name;              break;
        case Tyarray:   r->asize = t->asize;            break;
        case Typaram:   r->pname = strdup(t->pname);    break;
        case Tystruct:  r->sdecls = memdup(t->sdecls, t->nmemb*sizeof(Node*));   break;
        case Tyunion:   r->udecls = memdup(t->udecls, t->nmemb*sizeof(Node*));   break;
        default:        break;
    }
    return r;
}

/*
 * Creates a Tyvar with the same
 * constrants as the 'like' type
 */
Type *mktylike(Srcloc loc, Ty like)
{
    Type *t;
    int i;

    t = mktyvar(loc);
    for (i = 0; traits[like][i]; i++)
        settrait(t, traits[like][i]);
    return t;
}

/* steals memb, funcs */
Trait *mktrait(Srcloc loc, Node *name, Type *param, Node **memb, size_t nmemb, Node **funcs, size_t nfuncs, int isproto)
{
    Trait *t;

    t = zalloc(sizeof(Trait));
    t->uid = ntraittab++;
    t->loc = loc;
    if (t->uid < Ntraits)
        t->vis = Visbuiltin;
    t->vis = Visintern;
    t->name = name;
    t->param = param;
    t->memb = memb;
    t->nmemb = nmemb;
    t->funcs = funcs;
    t->nfuncs = nfuncs;
    t->isproto = isproto;

    traittab = xrealloc(traittab, ntraittab*sizeof(Trait*));
    traittab[t->uid] = t;
    return t;
}

Type *mktyvar(Srcloc loc)
{
    Type *t;

    t = mktype(loc, Tyvar);
    return t;
}

Type *mktyparam(Srcloc loc, char *name)
{
    Type *t;

    t = mktype(loc, Typaram);
    t->pname = strdup(name);
    return t;
}

Type *mktyunres(Srcloc loc, Node *name, Type **arg, size_t narg)
{
    Type *t;

    /* resolve it in the type inference stage */
    t = mktype(loc, Tyunres);
    t->name = name;
    t->arg = arg;
    t->narg = narg;
    return t;
}

Type *mktygeneric(Srcloc loc, Node *name, Type **param, size_t nparam, Type *base)
{
    Type *t;

    t = mktype(loc, Tygeneric);
    t->name = name;
    t->nsub = 1;
    t->traits = bsdup(base->traits);
    t->sub = xalloc(sizeof(Type*));
    t->sub[0] = base;
    t->gparam = param;
    t->ngparam = nparam;
    return t;
}

Type *mktyname(Srcloc loc, Node *name, Type *base)
{
    Type *t;

    t = mktype(loc, Tyname);
    t->name = name;
    t->nsub = 1;
    t->traits = bsdup(base->traits);
    t->sub = xalloc(sizeof(Type*));
    t->sub[0] = base;
    return t;
}

Type *mktyarray(Srcloc loc, Type *base, Node *sz)
{
    Type *t;

    t = mktype(loc, Tyarray);
    t->nsub = 1;
    t->nmemb = 1; /* the size is a "member" */
    t->sub = xalloc(sizeof(Type*));
    t->sub[0] = base;
    t->asize = sz;

    return t;
}

Type *mktyslice(Srcloc loc, Type *base)
{
    Type *t;

    t = mktype(loc, Tyslice);
    t->nsub = 1;
    t->sub = xalloc(sizeof(Type*));
    t->sub[0] = base;
    return t;
}

Type *mktyidxhack(Srcloc loc, Type *base)
{
    Type *t;

    t = mktype(loc, Tyvar);
    t->nsub = 1;
    t->sub = xalloc(sizeof(Type*));
    t->sub[0] = base;
    return t;
}

Type *mktyptr(Srcloc loc, Type *base)
{
    Type *t;

    t = mktype(loc, Typtr);
    t->nsub = 1;
    t->sub = xalloc(sizeof(Type*));
    t->sub[0] = base;
    return t;
}

Type *mktytuple(Srcloc loc, Type **sub, size_t nsub)
{
    Type *t;
    size_t i;

    t = mktype(loc, Tytuple);
    t->nsub = nsub;
    t->sub = xalloc(nsub*sizeof(Type*));
    for (i = 0; i < nsub; i++)
        t->sub[i] = sub[i];
    return t;
}

Type *mktyfunc(Srcloc loc, Node **args, size_t nargs, Type *ret)
{
    Type *t;
    size_t i;

    t = mktype(loc, Tyfunc);
    t->nsub = nargs + 1;
    t->sub = xalloc((1 + nargs)*sizeof(Type*));
    t->sub[0] = ret;
    for (i = 0; i < nargs; i++)
        t->sub[i + 1] = nodetype(args[i]);
    return t;
}

Type *mktystruct(Srcloc loc, Node **decls, size_t ndecls)
{
    Type *t;

    t = mktype(loc, Tystruct);
    t->nsub = 0;
    t->nmemb = ndecls;
    t->sdecls = memdup(decls, ndecls*sizeof(Node *));
    return t;
}

Type *mktyunion(Srcloc loc, Ucon **decls, size_t ndecls)
{
    Type *t;

    t = mktype(loc, Tyunion);
    t->nmemb = ndecls;
    t->udecls = decls;
    return t;
}

Ucon *finducon(Type *ty, Node *name)
{
    size_t i;

    ty = tybase(ty);
    for (i = 0; i < ty->nmemb; i++)
        if (!strcmp(namestr(ty->udecls[i]->name), namestr(name)))
            return ty->udecls[i];
    return NULL;
}

int istyunsigned(Type *t)
{
    switch (tybase(t)->type) {
        case Tybyte: case Tyuint8: case Tyuint16: case Tyuint:
        case Tychar: case Tyuint32: case Tyuint64: case Tyulong:
	case Typtr: case Tybool:
            return 1;
        default:
            return 0;
    }
}

int istysigned(Type *t)
{
    switch (tybase(t)->type) {
        case Tyint8: case Tyint16: case Tyint:
        case Tyint32: case Tyint64: case Tylong:
            return 1;
        default:
            return 0;
    }
}

int istyfloat(Type *t)
{
    switch (tybase(t)->type) {
        case Tyflt32: case Tyflt64:
            return 1;
        default:
            return 0;
    }
}

int istyprimitive(Type *t)
{
    return istysigned(t) || istyunsigned(t) || istyfloat(t);
}

/*
 * Checks if a type contains any type
 * parameers at all (ie, if it generic).
 */
int hasparamsrec(Type *t, Bitset *visited)
{
    size_t i;

    if (bshas(visited, t->tid))
        return 0;
    bsput(visited, t->tid);
    switch (t->type) {
        case Typaram:
        case Tygeneric:
            return 1;
        case Tyname:
            for (i = 0; i < t->narg; i++)
                if (hasparamsrec(t->arg[i], visited))
                    return 1;
            return hasparamsrec(t->sub[0], visited);
        case Tyunres:
            for (i = 0; i < t->narg; i++)
                if (hasparamsrec(t->arg[i], visited))
                    return 1;
            break;
        case Tystruct:
            for (i = 0; i < t->nmemb; i++)
                if (hasparamsrec(t->sdecls[i]->decl.type, visited))
                    return 1;
            break;
        case Tyunion:
            for (i = 0; i < t->nmemb; i++)
                if (t->udecls[i]->etype && hasparamsrec(t->udecls[i]->etype, visited))
                    return 1;
            break;
        default:
            for (i = 0; i < t->nsub; i++)
                if (hasparamsrec(t->sub[i], visited))
                    return 1;
            break;
    }
    return 0;
}

int hasparams(Type *t)
{
    Bitset *visited;
    int r;

    visited = mkbs();
    r = hasparamsrec(t, visited);
    bsfree(visited);
    return r;
}

Type *tybase(Type *t)
{
    assert(t != NULL);
    while (t->type == Tyname || t->type == Tygeneric)
        t = t->sub[0];
    return t;
}


static int namefmt(char *buf, size_t len, Node *n)
{
    char *p;
    char *end;

    p = buf;
    end = p + len;
    if (n->name.ns)
        p += bprintf(p, end - p, "%s.", n->name.ns);
    p += bprintf(p, end - p, "%s", n->name.name);
    return len - (end - p);
}

int settrait(Type *t, Trait *c)
{
    if (!t->traits)
        t->traits = mkbs();
    bsput(t->traits, c->uid);
    return 1;
}

int hastrait(Type *t, Trait *c)
{
    return t->traits && bshas(t->traits, c->uid);
}

int traitfmt(char *buf, size_t len, Type *t)
{
    size_t i;
    char *p;
    char *end;
    char *sep;

    if (!t->traits || !bscount(t->traits))
        return 0;

    p = buf;
    end = p + len;

    p += bprintf(p, end - p, " :: ");
    sep = "";
    for (i = 0; i < ntraittab; i++) {
        if (bshas(t->traits, i)) {
            p += bprintf(p, end - p, "%s%s", sep, namestr(traittab[i]->name));
            sep = ",";
        }
    }
    return p - buf;
}

static int fmtstruct(char *buf, size_t len, Type *t)
{
    size_t i;
    char *end, *p;
    char *name, *ty;

    p = buf;
    end = p + len;
    p += bprintf(p, end - p, "struct\n");
    for (i = 0; i < t->nmemb; i++) {
        name = declname(t->sdecls[i]);
        ty = tystr(decltype(t->sdecls[i]));
        p += bprintf(p, end - p, "\t%s:%s\n ", name, ty);
        free(ty);
    }
    p += bprintf(p, end - p, ";;");
    return p - buf;
}

static int fmtunion(char *buf, size_t len, Type *t)
{
    size_t i;
    char *end, *p;
    char *name, *ty;

    p = buf;
    end = p + len;
    p += bprintf(p, end - p, "union\n");
    for (i = 0; i < t->nmemb; i++) {
        name = namestr(t->udecls[i]->name);
        if (t->udecls[i]->etype) {
            ty = tystr(t->udecls[i]->etype);
            p += bprintf(p, end - p, "\t`%s %s\n", name, ty);
            free(ty);
        } else {
            p += bprintf(p, end - p, "\t`%s\n", name);
        }
    }
    p += bprintf(p, end - p, ";;");
    return p - buf;
}

static int fmtlist(char *buf, size_t len, Type **arg, size_t narg)
{
    char *end, *p, *sep;
    size_t i;

    sep = "";
    p = buf;
    end = p + len;
    p += bprintf(p, end - p, "(");
    for (i = 0; i < narg; i++)  {
        p += bprintf(p, end - p, "%s", sep);
        p += tybfmt(p, end - p, arg[i]);
        sep = ", ";
    }
    p += bprintf(p, end - p, ")");
    return p - buf;
}

static int tybfmt(char *buf, size_t len, Type *t)
{
    size_t i;
    char *p;
    char *end;
    char *sep;

    sep = "";
    p = buf;
    end = p + len;
    if (!t) {
        p += bprintf(p, end - p, "tynil");
        return len - (end - p);
    }
    switch (t->type) {
        case Tybad:     p += bprintf(p, end - p, "BAD");       break;
        case Tyvoid:    p += bprintf(p, end - p, "void");      break;
        case Tybool:    p += bprintf(p, end - p, "bool");      break;
        case Tychar:    p += bprintf(p, end - p, "char");      break;
        case Tyint8:    p += bprintf(p, end - p, "int8");      break;
        case Tyint16:   p += bprintf(p, end - p, "int16");     break;
        case Tyint:     p += bprintf(p, end - p, "int");       break;
        case Tyint32:   p += bprintf(p, end - p, "int32");     break;
        case Tyint64:   p += bprintf(p, end - p, "int64");     break;
        case Tylong:    p += bprintf(p, end - p, "long");      break;
        case Tybyte:    p += bprintf(p, end - p, "byte");      break;
        case Tyuint8:   p += bprintf(p, end - p, "uint8");     break;
        case Tyuint16:  p += bprintf(p, end - p, "uint16");    break;
        case Tyuint:    p += bprintf(p, end - p, "uint");      break;
        case Tyuint32:  p += bprintf(p, end - p, "uint32");    break;
        case Tyuint64:  p += bprintf(p, end - p, "uint64");    break;
        case Tyulong:   p += bprintf(p, end - p, "ulong");     break;
        case Tyflt32: p += bprintf(p, end - p, "flt32");   break;
        case Tyflt64: p += bprintf(p, end - p, "flt64");   break;
        case Tyvalist:  p += bprintf(p, end - p, "...");       break;

        case Typtr:     
            p += tybfmt(p, end - p, t->sub[0]);
            p += bprintf(p, end - p, "#");
            break;
        case Tyslice:
            p += tybfmt(p, end - p, t->sub[0]);
            p += bprintf(p, end - p, "[:]");
            break;
        case Tyarray:
            p += tybfmt(p, end - p, t->sub[0]);
            if (t->asize) {
                i = t->asize->expr.args[0]->lit.intval;
                p += bprintf(p, end - p, "[%zd]", i);
            } else {
                p += bprintf(p, end - p, "[]");
            }
            break;
        case Tyfunc:
            p += bprintf(p, end - p, "(");
            for (i = 1; i < t->nsub; i++) {
                p += bprintf(p, end - p, "%s", sep);
                p += tybfmt(p, end - p, t->sub[i]);
                sep = ", ";
            }
            p += bprintf(p, end - p, " -> ");
            p += tybfmt(p, end - p, t->sub[0]);
            p += bprintf(p, end - p, ")");
            break;
        case Tytuple:
            p += bprintf(p, end - p, "(");
            for (i = 0; i < t->nsub; i++) {
                p += bprintf(p, end - p, "%s", sep);
                p += tybfmt(p, end - p, t->sub[i]);
                sep = ",";
            }
            p += bprintf(p, end - p, ")");
            break;
        case Tyvar:
            p += bprintf(p, end - p, "$%d", t->tid);
            if (t->nsub) {
                p += bprintf(p, end - p, "(");
                for (i = 0; i < t->nsub; i++) {
                    p += bprintf(p, end - p, "%s", sep);
                    p += tybfmt(p, end - p, t->sub[i]);
                    sep = ", ";
                }
                p += bprintf(p, end - p, ")[]");
            }
            break;
        case Typaram:
            p += bprintf(p, end - p, "@%s", t->pname);
            break;
        case Tyunres:
            p += namefmt(p, end - p, t->name);
            if (t->narg)
                p += fmtlist(p, end - p, t->arg, t->narg);
            break;
        case Tyname:
            if (t->name->name.ns)
                p += bprintf(p, end - p, "%s.", t->name->name.ns);
            p += bprintf(p, end - p, "%s", namestr(t->name));
            if (t->narg)
                p += fmtlist(p, end - p, t->arg, t->narg);
            break;
        case Tygeneric:
            if (t->name->name.ns)
                p += bprintf(p, end - p, "%s.", t->name->name.ns);
            p += bprintf(p, end - p, "%s", namestr(t->name));
            if (t->ngparam)
                p += fmtlist(p, end - p, t->gparam, t->ngparam);
            break;
        case Tystruct:  p += fmtstruct(p, end - p, t);  break;
        case Tyunion:   p += fmtunion(p, end - p, t);   break;
        case Ntypes:
            die("Ntypes is not a type");
            break;
    }

    /* we only show constraints on non-builtin typaram */
    if (t->type == Tyvar || t->type == Typaram)
        p += traitfmt(p, end - p, t);

    return p - buf;
}

char *tyfmt(char *buf, size_t len, Type *t)
{
    tybfmt(buf, len, t);
    return buf;
}

char *traitstr(Type *t)
{
    char buf[1024];
    traitfmt(buf, 1024, t);
    return strdup(buf);
}

char *tystr(Type *t)
{
    char buf[1024];
    tyfmt(buf, 1024, t);
    return strdup(buf);
}

ulong tyhash(void *ty)
{
    size_t i;
    Type *t;
    ulong hash;

    t = (Type *)ty;
    switch (t->type) {
        /* Important: we want tyhash to be consistent cross-file, since it
         * is used in naming trait impls and such.
         *
         * We should find a better name.
         */
        case Tyvar:     hash = inthash(t->tid);         break;
        case Typaram:   hash = strhash(t->pname);       break;
        case Tyunion:   hash = inthash(t->type);        break;
        case Tystruct:  hash = inthash(t->type);        break;
        case Tyname:    hash = namehash(t->name);       break;
        default:        hash = inthash(t->type);        break;
    }

    for (i = 0; i < t->narg; i++)
        hash ^= tyhash(t->arg[i]);
    return hash;
}

int tyeq_rec(Type *a, Type *b, Bitset *visited)
{
    size_t i;

    if (!a || !b)
        return a == b;
    if (a->type != b->type)
        return 0;
    if (a->narg != b->narg)
        return 0;
    if (a->nsub != b->nsub)
        return 0;
    if (a->nmemb != b->nmemb)
        return 0;

    if (a->tid == b->tid)
        return 1;
    if (bshas(visited, a->tid) || bshas(visited, b->tid))
        return 1;

    bsput(visited, a->tid);
    bsput(visited, b->tid);

    switch (a->type) {
        case Typaram:
            return streq(a->pname, b->pname);
            break;
        case Tyvar:
            if (a->tid != b->tid)
                return 0;
            break;
        case Tyunres:
            if (!nameeq(a->name, b->name))
                return 0;
        case Tyunion:
            for (i = 0; i < a->nmemb; i++) {
                if (!nameeq(a->udecls[i]->name, b->udecls[i]->name))
                    return 0;
                if (!tyeq_rec(a->udecls[i]->etype, b->udecls[i]->etype, visited))
                    return 0;
            }
            break;
        case Tystruct:
            for (i = 0; i < a->nmemb; i++) {
                if (strcmp(declname(a->sdecls[i]), declname(b->sdecls[i])) != 0)
                    return 0;
                if (!tyeq_rec(decltype(a->sdecls[i]), decltype(b->sdecls[i]), visited))
                    return 0;
            }
            break;
        case Tyname:
            if (!nameeq(a->name, b->name))
                return 0;
            for (i = 0; i < a->narg; i++)
                if (!tyeq_rec(a->arg[i], b->arg[i], visited))
                    return 0;
            for (i = 0; i < a->nsub; i++)
                if (!tyeq_rec(a->sub[i], b->sub[i], visited))
                    return 0;
            break;
        case Tyarray:
            if (arraysz(a->asize) != arraysz(b->asize))
                return 0;
            break;
        default:
            break;
    }
    for (i = 0; i < a->nsub; i++)
        if (!tyeq_rec(a->sub[i], b->sub[i], visited))
            return 0;
    return 1;
}

int tyeq(void *a, void *b)
{
    Bitset *bs;
    int eq;

    if (a == b)
        return 1;
    bs = mkbs();
    eq = tyeq_rec(a, b, bs);
    bsfree(bs);
    return eq;
}

size_t tyidfmt(char *buf, size_t sz, Type *ty)
{
    size_t i;
    char *p, *end;

    p = buf;
    end = buf + sz;
    switch (ty->type) {
        case Ntypes:
        case Tybad:     die("invalid type");    break;
        case Tyvar:     die("tyvar has no idstr");      break;
        case Tyvoid:    p += bprintf(p, end - p, "v");  break;
        case Tychar:    p += bprintf(p, end - p, "c");  break;
        case Tybool:    p += bprintf(p, end - p, "t");  break;
        case Tyint8:    p += bprintf(p, end - p, "b");  break;
        case Tyint16:   p += bprintf(p, end - p, "s");  break;
        case Tyint:     p += bprintf(p, end - p, "i");  break;
        case Tyint32:   p += bprintf(p, end - p, "w");  break;
        case Tyint64:   p += bprintf(p, end - p, "q");  break;
        case Tylong:    p += bprintf(p, end - p, "l");  break;

        case Tybyte:    p += bprintf(p, end - p, "H");  break;
        case Tyuint8:   p += bprintf(p, end - p, "B");  break;
        case Tyuint16:  p += bprintf(p, end - p, "S");  break;
        case Tyuint:    p += bprintf(p, end - p, "I");  break;
        case Tyuint32:  p += bprintf(p, end - p, "W");  break;
        case Tyuint64:  p += bprintf(p, end - p, "Q");  break;
        case Tyulong:   p += bprintf(p, end - p, "L");  break;
        case Tyflt32:   p += bprintf(p, end - p, "f");  break;
        case Tyflt64:   p += bprintf(p, end - p, "d");  break;
        case Tyvalist:  p += bprintf(p, end - p, "V");  break;
        case Typtr:
            p += bprintf(p, end - p, "$p");
            p += tyidfmt(p, end - p, ty->sub[0]);
            break;
        case Tyarray:
            p += bprintf(p, end - p, "$a%lld", (vlong)arraysz(ty->asize));
            p += tyidfmt(p, end - p, ty->sub[0]);
            break;
        case Tyslice:
            p += bprintf(p, end - p, "$s");
            p += tyidfmt(p, end - p, ty->sub[0]);
            break;
        case Tyfunc:
            p += bprintf(p, end - p, "$f");
            for (i = 0; i < ty->nsub; i++) {
                p += tyidfmt(p, end - p, ty->sub[i]);
                p += bprintf(p, end - p, "$");
            }
            break;
        case Tytuple:
            p += bprintf(p, end - p, "$e");
            for (i = 0; i < ty->nsub; i++) {
                p += tyidfmt(p, end - p, ty->sub[i]);
            }
            p += bprintf(p, end - p, "$");
            break;
        case Tystruct:
            p += bprintf(p, end - p, "$t%lld", ty->tid);
            break;
        case Tyunion:
            p += bprintf(p, end - p, "$u%lld", ty->tid);
            break;
        case Typaram:
            p += bprintf(p, end - p, "$r%s", ty->pname);
            break;
        case Tyunres:
        case Tyname:
            p += bprintf(p, end - p, "$n");
            if (ty->name->name.ns)
                p += bprintf(p, end - p, "%s", ty->name->name.ns);
            p += bprintf(p, end - p, "$%s", ty->name->name.name);
            if (ty->arg)
                for (i = 0; i < ty->narg; i++)
                    p += tyidfmt(p, end - p, ty->arg[i]);
            else if (ty->gparam)
                for (i = 0; i < ty->ngparam; i++)
                    p += tyidfmt(p, end - p, ty->gparam[i]);
            break;
        case Tygeneric:
            break;
    }
    return p - buf;
}

void tyinit(Stab *st)
{
    int i;
    Type *ty;

/* this must be done after all the types are created, otherwise we will
 * clobber the memoized bunch of types with the type params. */
#define Tc(c, n) \
    mktrait(Zloc, mkname(Zloc, n), NULL, NULL, 0, NULL, 0, 0);
#include "trait.def"
#undef Tc

    /* char::(numeric,integral) */
    traits[Tychar][0] = traittab[Tcnum];
    traits[Tychar][1] = traittab[Tcint];

    traits[Tybyte][0] = traittab[Tcnum];
    traits[Tybyte][1] = traittab[Tcint];

    /* <integer types>::(numeric,integral) */
    for (i = Tyint8; i < Tyflt32; i++) {
        traits[i][0] = traittab[Tcnum];
        traits[i][1] = traittab[Tcint];
    }

    /* <floats>::(numeric,floating) */
    traits[Tyflt32][0] = traittab[Tcnum];
    traits[Tyflt32][1] = traittab[Tcfloat];
    traits[Tyflt64][0] = traittab[Tcnum];
    traits[Tyflt64][1] = traittab[Tcfloat];

    /* @a*::(sliceable) */
    traits[Typtr][0] = traittab[Tcslice];

    /* @a[:]::(indexable,sliceable) */
    traits[Tyslice][0] = traittab[Tcslice];
    traits[Tyslice][1] = traittab[Tcidx];

    /* @a[SZ]::(indexable,sliceable) */
    traits[Tyarray][0] = traittab[Tcidx];
    traits[Tyarray][1] = traittab[Tcslice];

/* Definining and registering the types has to go after we define the
 * constraints, otherwise they will have no constraints set on them. */
#define Ty(t, n) \
    if (t != Ntypes) {\
      ty = mktype(Zloc, t); \
      if (n) { \
          puttype(st, mkname(Zloc, n), ty); \
      } \
    }
#include "types.def"
#undef Ty
}