ref: d7651f741ddd7b3db322a726a0499642d3c5fbec
dir: /6/typeinfo.c/
#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 "util.h"
#include "parse.h"
#include "mi.h"
#include "asm.h"
#include "../config.h"
#define Tdindirect 0x80
Blob *tydescsub(Type *ty);
size_t
blobsz(Blob *b)
{
size_t n;
size_t i;
switch (b->type) {
case Bti8: return 1; break;
case Bti16: return 2; break;
case Bti32: return 4; break;
case Bti64: return 8; break;
case Btref: return 8; break;
case Btbytes: return b->bytes.len; break;
case Btimin:
if (b->ival >= 1ULL << 56)
die("packed int too big");
for (i = 1; i < 8; i++)
if (b->ival < 1ULL << (7*i))
return i;
die("impossible blob size");
break;
case Btseq:
n = 0;
for (i = 0; i < b->seq.nsub; i++)
n += blobsz(b->seq.sub[i]);
return n;
break;
default:
die("unknown blob type");
}
return 0;
}
void
namevec(Blob ***sub, size_t *nsub, Node *n)
{
char *buf;
size_t len;
if (n->name.ns) {
len = strlen(n->name.name) + strlen(n->name.ns) + 1;
buf = xalloc(len + 1);
bprintf(buf, len + 1, "%s.%s", n->name.ns, n->name.name);
} else {
len = strlen(n->name.name);
buf = xalloc(len + 1);
bprintf(buf, len + 1, "%s", n->name.name);
}
lappend(sub, nsub, mkblobi(Btimin, len));
lappend(sub, nsub, mkblobbytes(buf, len));
}
static void
structmemb(Blob ***sub, size_t *nsub, Node *sdecl)
{
Blob *b;
namevec(sub, nsub, sdecl->decl.name);
b = tydescsub(sdecl->decl.type);
lappend(sub, nsub, b);
}
static void
unionmemb(Blob ***sub, size_t *nsub, Ucon *ucon)
{
namevec(sub, nsub, ucon->name);
if (ucon->etype) {
lappend(sub, nsub, tydescsub(ucon->etype));
} else {
lappend(sub, nsub, mkblobi(Btimin, 1));
lappend(sub, nsub, mkblobi(Bti8, Tybad));
}
}
static void
encodetypeinfo(Blob ***sub, size_t *nsub, Type *t)
{
lappend(sub, nsub, mkblobi(Btimin, tysize(t)));
lappend(sub, nsub, mkblobi(Btimin, tyalign(t)));
}
Blob *
tydescsub(Type *ty)
{
Blob **sub, *sz, *bt, *b;
size_t i, nsub;
char buf[512];
uint8_t tt;
Node *len;
int isextern;
sub = NULL;
nsub = 0;
/* names are pulled out of line */
tt = ty->type;
/* tyvars can get tagged, but aren't desired */
if (ty->type == Tyvar)
return NULL;
ty = tydedup(ty);
if (ty->type == Tyname)
tt |= Tdindirect;
sz = mkblobi(Btimin, 0);
bt = mkblobi(Bti8, tt);
lappend(&sub, &nsub, bt);
switch (ty->type) {
case Ntypes: case Tyvar: case Tybad: case Typaram:
case Tygeneric: case Tycode: case Tyunres:
die("invalid type in tydesc");
break;
/* atomic types -- nothing else to do */
case Tyvoid: case Tychar: case Tybool: case Tyint8:
case Tyint16: case Tyint: case Tyint32: case Tyint64:
case Tybyte: case Tyuint8: case Tyuint16:
case Tyuint: case Tyuint32: case Tyuint64:
case Tyflt32: case Tyflt64: case Tyvalist:
break;
case Typtr:
lappend(&sub, &nsub, tydescsub(ty->sub[0]));
break;
case Tyslice:
lappend(&sub, &nsub, tydescsub(ty->sub[0]));
break;
case Tyarray:
encodetypeinfo(&sub, &nsub, ty);
ty->asize = fold(ty->asize, 1);
len = ty->asize;
if (len) {
assert(len->type == Nexpr);
len = len->expr.args[0];
assert(len->type == Nlit && len->lit.littype == Lint);
lappend(&sub, &nsub, mkblobi(Btimin, len->lit.intval));
} else {
lappend(&sub, &nsub, mkblobi(Btimin, 0));
}
lappend(&sub, &nsub, tydescsub(ty->sub[0]));
break;
case Tyfunc:
lappend(&sub, &nsub, mkblobi(Btimin, ty->nsub));
for (i = 0; i < ty->nsub; i++)
lappend(&sub, &nsub, tydescsub(ty->sub[i]));
break;
case Tytuple:
encodetypeinfo(&sub, &nsub, ty);
lappend(&sub, &nsub, mkblobi(Btimin, ty->nsub));
for (i = 0; i < ty->nsub; i++)
lappend(&sub, &nsub, tydescsub(ty->sub[i]));
break;
case Tystruct:
encodetypeinfo(&sub, &nsub, ty);
lappend(&sub, &nsub, mkblobi(Btimin, ty->nmemb));
for (i = 0; i < ty->nmemb; i++)
structmemb(&sub, &nsub, ty->sdecls[i]);
break;
case Tyunion:
encodetypeinfo(&sub, &nsub, ty);
lappend(&sub, &nsub, mkblobi(Btimin, ty->nmemb));
for (i = 0; i < ty->nmemb; i++)
unionmemb(&sub, &nsub, ty->udecls[i]);
break;
case Tyname:
i = bprintf(buf, sizeof buf, "%s", Symprefix);
tydescid(buf + i, sizeof buf - i, ty);
isextern = ty->isimport || ty->vis != Visintern;
lappend(&sub, &nsub, mkblobref(buf, 0, isextern));
break;
}
b = mkblobseq(sub, nsub);
sz->ival = blobsz(b);
linsert(&b->seq.sub, &b->seq.nsub, 0, sz);
return b;
}
Blob *
namedesc(Type *ty)
{
Blob **sub;
size_t nsub;
sub = NULL;
nsub = 0;
lappend(&sub, &nsub, mkblobi(Bti8, Tyname));
namevec(&sub, &nsub, ty->name);
lappend(&sub, &nsub, tydescsub(ty->sub[0]));
return mkblobseq(sub, nsub);
}
Blob *
tydescblob(Type *ty)
{
char buf[512];
Blob *b, *sz, *sub;
if (ty->type == Tyname && hasparams(ty))
return NULL;
if (ty->type == Tyname) {
b = mkblobseq(NULL, 0);
sz = mkblobi(Btimin, 0);
sub = namedesc(ty);
sz->ival = blobsz(sub);
lappend(&b->seq.sub, &b->seq.nsub, sz);
lappend(&b->seq.sub, &b->seq.nsub, sub);
if (ty->vis != Visintern)
b->isglobl = 1;
} else {
b = tydescsub(ty);
}
tydescid(buf, sizeof buf, ty);
b->lbl = strdup(buf);
return b;
}
size_t
tysize(Type *t)
{
size_t sz;
size_t i;
sz = 0;
if (!t)
die("size of empty type => bailing.");
switch (t->type) {
case Tyvoid:
return 0;
case Tybool: case Tyint8:
case Tybyte: case Tyuint8:
return 1;
case Tyint16: case Tyuint16:
return 2;
case Tyint: case Tyint32:
case Tyuint: case Tyuint32:
case Tychar: /* utf32 */
return 4;
case Typtr:
case Tyvalist: /* ptr to first element of valist */
return Ptrsz;
case Tyint64:
case Tyuint64:
return 8;
/*end integer types*/
case Tyflt32:
return 4;
case Tyflt64:
return 8;
case Tycode:
return Ptrsz;
case Tyfunc:
return 2*Ptrsz;
case Tyslice:
return 2*Ptrsz; /* len; ptr */
case Tyname:
return tysize(t->sub[0]);
case Tyarray:
if (!t->asize)
return 0;
t->asize = fold(t->asize, 1);
assert(exprop(t->asize) == Olit);
return t->asize->expr.args[0]->lit.intval * tysize(t->sub[0]);
case Tytuple:
for (i = 0; i < t->nsub; i++) {
sz = alignto(sz, t->sub[i]);
sz += tysize(t->sub[i]);
}
sz = alignto(sz, t);
return sz;
break;
case Tystruct:
for (i = 0; i < t->nmemb; i++) {
sz = alignto(sz, decltype(t->sdecls[i]));
sz += size(t->sdecls[i]);
}
sz = alignto(sz, t);
return sz;
break;
case Tyunion:
sz = Wordsz;
for (i = 0; i < t->nmemb; i++)
if (t->udecls[i]->etype)
sz = max(sz, tysize(t->udecls[i]->etype) + Wordsz);
return align(sz, tyalign(t));
break;
case Tygeneric: case Tybad: case Tyvar:
case Typaram: case Tyunres: case Ntypes:
die("Type %s does not have size; why did it get down to here?", tystr(t));
break;
}
return -1;
}
size_t
tyalign(Type *ty)
{
size_t align, i;
align = 1;
ty = tybase(ty);
switch (ty->type) {
case Tyarray:
align = tyalign(ty->sub[0]);
break;
case Tytuple:
for (i = 0; i < ty->nsub; i++)
align = max(align, tyalign(ty->sub[0]));
break;
case Tyunion:
align = 4;
for (i = 0; i < ty->nmemb; i++)
if (ty->udecls[i]->etype)
align = max(align, tyalign(ty->udecls[i]->etype));
break;
case Tystruct:
for (i = 0; i < ty->nmemb; i++)
align = max(align, tyalign(decltype(ty->sdecls[i])));
break;
default:
align = max(align, tysize(ty));
}
return min(align, Ptrsz);
}
/* gets the byte offset of 'memb' within the aggregate type 'aggr' */
ssize_t
tyoffset(Type *ty, Node *memb)
{
size_t i;
size_t off;
ty = tybase(ty);
if (ty->type == Typtr)
ty = tybase(ty->sub[0]);
assert(ty->type == Tystruct);
off = 0;
for (i = 0; i < ty->nmemb; i++) {
off = alignto(off, decltype(ty->sdecls[i]));
if (!strcmp(namestr(memb), declname(ty->sdecls[i])))
return off;
off += size(ty->sdecls[i]);
}
die("bad offset");
return 0;
}
size_t
size(Node *n)
{
Type *t;
if (n->type == Nexpr)
t = n->expr.type;
else
t = n->decl.type;
return tysize(t);
}
ssize_t
offset(Node *aggr, Node *memb)
{
return tyoffset(exprtype(aggr), memb);
}