ref: cef2d4ebd48ab554330e49f8961547e05df47127
dir: /6/blob.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"
static size_t blobrec(Blob *b, Htab *globls, Htab *strtab, Node *n);
Blob *
mkblobi(Blobtype type, uint64_t ival)
{
Blob *b;
b = zalloc(sizeof(Blob));
b->type = type;
b->ival = ival;
return b;
}
Blob *
mkblobpad(size_t sz)
{
Blob *b;
b = zalloc(sizeof(Blob));
b->type = Btpad;
b->npad = sz;
return b;
}
Blob *
mkblobbytes(char *buf, size_t len)
{
Blob *b;
b = zalloc(sizeof(Blob));
b->type = Btbytes;
b->bytes.buf = buf;
b->bytes.len = len;
return b;
}
Blob *
mkblobseq(Blob **sub, size_t nsub)
{
Blob *b;
b = zalloc(sizeof(Blob));
b->type = Btseq;
b->seq.sub = sub;
b->seq.nsub = nsub;
return b;
}
Blob *
mkblobref(char *lbl, size_t off, int isextern)
{
Blob *b;
b = zalloc(sizeof(Blob));
b->type = Btref;
b->ref.str = strdup(lbl);
b->ref.isextern = isextern;
b->ref.off = off;
return b;
}
void
blobfree(Blob *b)
{
size_t i;
if (!b)
return;
switch (b->type) {
case Btref:
free(b->lbl);
break;
case Btseq:
for (i = 0; i < b->seq.nsub; i++)
blobfree(b->seq.sub[i]);
break;
default:
break;
}
free(b);
}
static size_t
getintlit(Node *n, char *failmsg)
{
if (exprop(n) != Olit)
fatal(n, "%s", failmsg);
n = n->expr.args[0];
if (n->lit.littype != Lint)
fatal(n, "%s", failmsg);
return n->lit.intval;
}
void
b(Blob *b, Blob *n)
{
lappend(&b->seq.sub, &b->seq.nsub, n);
}
static size_t
blobpad(Blob *seq, size_t sz)
{
if (sz)
b(seq, mkblobpad(sz));
return sz;
}
static size_t
bloblit(Blob *seq, Htab *strtab, Node *v, Type *ty)
{
char buf[128];
char *lbl;
size_t sz;
Blobtype intsz[] = {
[1] = Bti8,
[2] = Bti16,
[4] = Bti32,
[8] = Bti64
};
union {
float fv;
double dv;
uint64_t qv;
uint32_t lv;
} u;
assert(v->type == Nlit);
sz = tysize(ty);
switch (v->lit.littype) {
case Lvoid: break;
case Lint: b(seq, mkblobi(intsz[sz], v->lit.intval)); break;
case Lbool: b(seq, mkblobi(Bti8, v->lit.boolval)); break;
case Lchr: b(seq, mkblobi(Bti32, v->lit.chrval)); break;
case Lflt:
if (tybase(v->lit.type)->type == Tyflt32) {
u.fv = v->lit.fltval;
b(seq, mkblobi(Bti32, u.lv));
} else if (tybase(v->lit.type)->type == Tyflt64) {
u.dv = v->lit.fltval;
b(seq, mkblobi(Bti64, u.qv));
}
break;
case Lstr:
if (hthas(strtab, &v->lit.strval)) {
lbl = htget(strtab, &v->lit.strval);
} else {
lbl = genlocallblstr(buf, sizeof buf);
htput(strtab, &v->lit.strval, strdup(lbl));
}
if (v->lit.strval.len > 0)
b(seq, mkblobref(lbl, 0, 1));
else
b(seq, mkblobi(Bti64, 0));
b(seq, mkblobi(Bti64, v->lit.strval.len));
break;
case Lfunc:
lbl = asmname(v);
b(seq, mkblobi(Bti64, 0));
b(seq, mkblobref(lbl, 0, 0));
break;
case Llbl:
die("Can't generate literal labels, ffs. They're not data.");
break;
}
return sz;
}
static size_t
blobslice(Blob *seq, Htab *globls, Htab *strtab, Node *n)
{
Node *base, *lo, *hi;
ssize_t loval, hival, sz;
Blob *slbase;
char *lbl;
base = n->expr.args[0];
lo = n->expr.args[1];
hi = n->expr.args[2];
/* by this point, all slicing operations should have had their base
* pulled out, and we should have vars with their pseudo-decls in their
* place */
loval = getintlit(lo, "lower bound in slice is not constant literal");
hival = getintlit(hi, "upper bound in slice is not constant literal");
if (exprop(base) == Ovar && base->expr.isconst) {
sz = tysize(tybase(exprtype(base))->sub[0]);
lbl = htget(globls, base);
slbase = mkblobref(lbl, loval*sz, 1);
} else if (exprop(base) == Olit || exprop(base) == Oarr) {
slbase = mkblobi(Bti64, getintlit(base, "invalid base expr"));
} else {
fatal(base, "slice base is not a constant value");
}
b(seq, slbase);
b(seq, mkblobi(Bti64, (hival - loval)));
return 16;
}
static Node *
structmemb(Node *n, char *dcl)
{
size_t i;
for (i = 0; i < n->expr.nargs; i++)
if (!strcmp(namestr(n->expr.args[i]->expr.idx), dcl))
return n->expr.args[i];
return NULL;
}
static size_t
blobstruct(Blob *seq, Htab *globls, Htab *strtab, Node *n)
{
size_t i, sz, pad, end, ndcl;
Node **dcl, *m;
Type *t;
sz = 0;
t = tybase(exprtype(n));
assert(t->type == Tystruct);
dcl = t->sdecls;
ndcl = t->nmemb;
for (i = 0; i < ndcl; i++) {
pad = alignto(sz, decltype(dcl[i]));
m = structmemb(n, declname(dcl[i]));
sz += blobpad(seq, pad - sz);
if (m)
sz += blobrec(seq, globls, strtab, m);
else
sz += blobpad(seq, size(dcl[i]));
}
end = alignto(sz, t);
sz += blobpad(seq, end - sz);
return sz;
}
static size_t
blobucon(Blob *seq, Htab *globls, Htab *strtab, Node *n)
{
size_t sz, align;
Ucon *uc;
sz = 4;
uc = finducon(exprtype(n), n->expr.args[0]);
b(seq, mkblobi(Bti32, uc->id));
align = 1;
if (n->expr.nargs > 1) {
align = tyalign(exprtype(n->expr.args[1]));
if (align > sz)
sz += blobpad(seq, align - sz);
sz += blobrec(seq, globls, strtab, n->expr.args[1]);
}
sz += blobpad(seq, size(n) - sz);
return sz;
}
static size_t
blobvar(Blob *seq, Htab *strtab, Node *var, Type *ty)
{
Node *dcl;
Ty tt;
dcl = decls[var->expr.did];
tt = tybase(ty)->type;
if ((tt != Tyfunc && tt != Tycode)|| !dcl->decl.isglobl)
fatal(var, "non-constant initializer %s", namestr(var->expr.args[0]));
b(seq, mkblobi(Bti64, 0));
b(seq, mkblobref(asmname(dcl), 0, 1));
return 16;
}
static size_t
blobrec(Blob *b, Htab *globls, Htab *strtab, Node *n)
{
size_t i, sz, end;
switch(exprop(n)) {
case Oucon: sz = blobucon(b, globls, strtab, n); break;
case Oslice: sz = blobslice(b, globls, strtab, n); break;
case Ostruct: sz = blobstruct(b, globls, strtab, n); break;
case Ovar: sz = blobvar(b, strtab, n, exprtype(n)); break;
case Olit: sz = bloblit(b, strtab, n->expr.args[0], exprtype(n)); break;
case Otup:
case Oarr:
/* Assumption: We sorted this while folding */
sz = 0;
if (!n->expr.args)
break;
for (i = 0; i < n->expr.nargs; i++) {
end = alignto(sz, exprtype(n->expr.args[i]));
sz += blobpad(b, end - sz);
sz += blobrec(b, globls, strtab, n->expr.args[i]);
}
/* if we need padding at the end.. */
end = alignto(sz, exprtype(n));
sz += blobpad(b, end - sz);
break;
default:
dump(n, stdout);
die("Nonliteral initializer for global");
break;
}
return sz;
}
Blob *
litblob(Htab *globls, Htab *strtab, Node *n)
{
Blob *b;
b = mkblobseq(NULL, 0);
blobrec(b, globls, strtab, n);
return b;
}