ref: e93384f50f44d026b978b363eb107b14efeef3a1
dir: /6/genp9.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 "parse.h"
#include "mi.h"
#include "asm.h"
#include "../config.h"
/* string tables */
static char *insnfmt[] = {
#define Insn(val, gasfmt, p9fmt, use, def) p9fmt,
#include "insns.def"
#undef Insn
};
static char *regnames[] = {
#define Reg(r, gasname, p9name, mode) p9name,
#include "regs.def"
#undef Reg
};
static char* modenames[] = {
[ModeB] = "B",
[ModeW] = "W",
[ModeL] = "L",
[ModeQ] = "Q",
[ModeF] = "S",
[ModeD] = "D"
};
static size_t writeblob(FILE *fd, char *name, size_t off, Htab *globls, Htab *strtab, Node *blob);
static void locprint(FILE *fd, Loc *l, char spec);
static void fillglobls(Stab *st, Htab *globls)
{
void **k;
size_t i, nk;
Stab *stab;
Node *s;
k = htkeys(st->dcl, &nk);
for (i = 0; i < nk; i++) {
s = htget(st->dcl, k[i]);
htput(globls, s, asmname(s));
}
free(k);
k = htkeys(st->ns, &nk);
for (i = 0; i < nk; i++) {
stab = htget(st->ns, k[i]);
fillglobls(stab, globls);
}
free(k);
}
static void initconsts(Htab *globls)
{
Type *ty;
Node *name;
Node *dcl;
tyintptr = mktype(Zloc, Tyuint64);
tyword = mktype(Zloc, Tyuint);
tyvoid = mktype(Zloc, Tyvoid);
ty = mktyfunc(Zloc, NULL, 0, mktype(Zloc, Tyvoid));
name = mknsname(Zloc, "_rt", "abort_oob");
dcl = mkdecl(Zloc, name, ty);
dcl->decl.isconst = 1;
dcl->decl.isextern = 1;
htput(globls, dcl, asmname(dcl));
abortoob = mkexpr(Zloc, Ovar, name, NULL);
abortoob->expr.type = ty;
abortoob->expr.did = dcl->decl.did;
abortoob->expr.isconst = 1;
}
static void printmem(FILE *fd, Loc *l, char spec)
{
if (l->type == Locmem) {
if (l->mem.constdisp)
fprintf(fd, "%ld", l->mem.constdisp);
} else if (l->mem.lbldisp) {
fprintf(fd, "%s", l->mem.lbldisp);
}
if (!l->mem.base || l->mem.base->reg.colour == Rrip) {
fprintf(fd, "+0(SB)");
} else {
fprintf(fd, "(");
locprint(fd, l->mem.base, 'r');
fprintf(fd, ")");
}
if (l->mem.idx) {
fprintf(fd, "(");
locprint(fd, l->mem.idx, 'r');
fprintf(fd, "*%d", l->mem.scale);
fprintf(fd, ")");
}
}
static void locprint(FILE *fd, Loc *l, char spec)
{
spec = tolower(spec);
assert(l->mode);
switch (l->type) {
case Loclitl:
assert(spec == 'i' || spec == 'x' || spec == 'u');
fprintf(fd, "$%s", l->lbl);
break;
case Loclbl:
assert(spec == 'm' || spec == 'v' || spec == 'x');
fprintf(fd, "%s", l->lbl);
break;
case Locreg:
assert((spec == 'r' && isintmode(l->mode)) ||
(spec == 'f' && isfloatmode(l->mode)) ||
spec == 'v' ||
spec == 'x' ||
spec == 'u');
if (l->reg.colour == Rnone)
fprintf(fd, "%%P.%zd%s", l->reg.id, modenames[l->mode]);
else
fprintf(fd, "%s", regnames[l->reg.colour]);
break;
case Locmem:
case Locmeml:
assert(spec == 'm' || spec == 'v' || spec == 'x');
printmem(fd, l, spec);
break;
case Loclit:
assert(spec == 'i' || spec == 'x' || spec == 'u');
fprintf(fd, "$%ld", l->lit);
break;
case Locnone:
die("Bad location in locprint()");
break;
}
}
static int issubreg(Loc *a, Loc *b)
{
return rclass(a) == rclass(b) && a->mode != b->mode;
}
static void iprintf(FILE *fd, Insn *insn)
{
char *p;
int i;
int idx;
/* x64 has a quirk; it has no movzlq because mov zero extends. This
* means that we need to do a movl when we really want a movzlq. Since
* we don't know the name of the reg to use, we need to sub it in when
* writing... */
switch (insn->op) {
case Imovzx:
if (insn->args[0]->mode == ModeL && insn->args[1]->mode == ModeQ) {
if (insn->args[1]->reg.colour) {
insn->op = Imov;
insn->args[1] = coreg(insn->args[1]->reg.colour, ModeL);
}
}
break;
case Imovs:
if (insn->args[0]->reg.colour == Rnone || insn->args[1]->reg.colour == Rnone)
break;
/* moving a reg to itself is dumb. */
if (insn->args[0]->reg.colour == insn->args[1]->reg.colour)
return;
break;
case Imov:
assert(!isfloatmode(insn->args[0]->mode));
if (insn->args[0]->type != Locreg || insn->args[1]->type != Locreg)
break;
if (insn->args[0]->reg.colour == Rnone || insn->args[1]->reg.colour == Rnone)
break;
/* if one reg is a subreg of another, we can just use the right
* mode to move between them. */
if (issubreg(insn->args[0], insn->args[1]))
insn->args[0] = coreg(insn->args[0]->reg.colour, insn->args[1]->mode);
/* moving a reg to itself is dumb. */
if (insn->args[0]->reg.colour == insn->args[1]->reg.colour)
return;
break;
default:
break;
}
p = insnfmt[insn->op];
i = 0; /* NB: this is 1 based indexing */
for (; *p; p++) {
if (*p != '%') {
fputc(*p, fd);
continue;
}
/* %-formating */
p++;
idx = i;
again:
switch (*p) {
case '\0':
goto done; /* skip the final p++ */
break;
case 'R': /* int register */
case 'F': /* float register */
case 'M': /* memory */
case 'I': /* imm */
case 'V': /* reg/mem */
case 'U': /* reg/imm */
case 'X': /* reg/mem/imm */
locprint(fd, insn->args[idx], *p);
i++;
break;
case 'T':
fputs(modenames[insn->args[idx]->mode], fd);
break;
default:
/* the asm description uses 1-based indexing, so that 0
* can be used as a sentinel. */
if (!isdigit(*p))
die("Invalid %%-specifier '%c'", *p);
idx = strtol(p, &p, 10) - 1;
goto again;
break;
}
}
done:
return;
}
static size_t writebytes(FILE *fd, char *name, size_t off, char *p, size_t sz)
{
size_t i, len;
assert(sz != 0);
for (i = 0; i < sz; i++) {
len = min(sz - i, 8);
if (i % 8 == 0)
fprintf(fd, "DATA %s+%zd(SB)/%zd,$\"", name, off + i, len);
if (p[i] == '"' || p[i] == '\\')
fprintf(fd, "\\");
if (isprint(p[i]))
fprintf(fd, "%c", p[i]);
else
fprintf(fd, "\\%03o", (uint8_t)p[i] & 0xff);
/* line wrapping for readability */
if (i % 8 == 7 || i == sz - 1)
fprintf(fd, "\"\n");
}
return sz;
}
static size_t writelit(FILE *fd, char *name, size_t off, Htab *strtab, Node *v, Type *ty)
{
char buf[128];
char *lbl;
size_t sz;
union {
float fv;
double dv;
uint64_t qv;
uint32_t lv;
} u;
assert(v->type == Nlit);
sz = tysize(ty);
switch (v->lit.littype) {
case Lint:
fprintf(fd, "DATA %s+%zd(SB)/%zd,$%lld\n", name, off, sz, v->lit.intval);
break;
case Lbool:
fprintf(fd, "DATA %s+%zd(SB)/%zd,$%d\n", name, off, sz, v->lit.boolval);
break;
case Lchr:
fprintf(fd, "DATA %s+%zd(SB)/%zd,$%d\n", name, off, sz, v->lit.chrval);
break;
case Lflt:
if (tybase(v->lit.type)->type == Tyflt32) {
u.fv = v->lit.fltval;
fprintf(fd, "DATA %s+%zd(SB)/%zd, $0x%llx\n", name, off, sz, (vlong)u.lv);
} else if (tybase(v->lit.type)->type == Tyflt64) {
u.dv = v->lit.fltval;
fprintf(fd, "DATA %s+%zd(SB)/%zd, $0x%llx\n", name, off, sz, (vlong)u.qv);
}
break;
case Lstr:
if (hthas(strtab, &v->lit.strval)) {
lbl = htget(strtab, &v->lit.strval);
} else {
lbl = genlocallblstr(buf, sizeof buf);
htput(strtab, &v->lit.strval, strdup(lbl));
}
if (v->lit.strval.len > 0)
fprintf(fd, "DATA %s+%zd(SB)/8,$%s+0(SB)\n", name, off, lbl);
else
fprintf(fd, "DATA %s+%zd(SB)/8,$0\n", name, off);
fprintf(fd, "DATA %s+%zd(SB)/8,$%zd\n", name, off+8, v->lit.strval.len);
break;
case Lfunc:
die("Generating this shit ain't ready yet ");
break;
case Llbl:
die("Can't generate literal labels, ffs. They're not data.");
break;
}
return sz;
}
static size_t writepad(FILE *fd, char *name, size_t off, size_t sz)
{
size_t n;
assert((ssize_t)sz >= 0);
while (sz > 0) {
n = min(sz, 8);
fprintf(fd, "DATA %s+%zd(SB)/%zd,$0\n", name, off, n);
sz -= n;
}
return sz;
}
static size_t getintlit(Node *n, char *failmsg)
{
if (exprop(n) != Olit)
fatal(n, "%s", failmsg);
n = n->expr.args[0];
if (n->lit.littype != Lint)
fatal(n, "%s", failmsg);
return n->lit.intval;
}
static size_t writeslice(FILE *fd, char *name, size_t off, Htab *globls, Htab *strtab, Node *n)
{
Node *base, *lo, *hi;
ssize_t loval, hival, sz;
char *lbl;
base = n->expr.args[0];
lo = n->expr.args[1];
hi = n->expr.args[2];
/* by this point, all slicing operations should have had their bases
* pulled out, and we should have vars with their pseudo-decls in their
* place */
if (exprop(base) != Ovar || !base->expr.isconst)
fatal(base, "slice base is not a constant value");
loval = getintlit(lo, "lower bound in slice is not constant literal");
hival = getintlit(hi, "upper bound in slice is not constant literal");
sz = tysize(tybase(exprtype(base))->sub[0]);
lbl = htget(globls, base);
fprintf(fd, "DATA %s+%zd(SB)/8,$%s+%zd(SB)\n", name, off, lbl, loval*sz);
fprintf(fd, "DATA %s+%zd(SB)/8,$%zd\n", name, off + Ptrsz, (hival - loval));
return size(n);
}
static size_t writestruct(FILE *fd, char *name, size_t off, Htab *globls, Htab *strtab, Node *n)
{
Type *t;
Node **dcl;
int found;
size_t i, j;
size_t pad, start, end;
size_t ndcl;
start = off;
t = tybase(exprtype(n));
assert(t->type == Tystruct);
dcl = t->sdecls;
ndcl = t->nmemb;
for (i = 0; i < ndcl; i++) {
pad = alignto(off, decltype(dcl[i]));
off += writepad(fd, name, off, pad - off);
found = 0;
for (j = 0; j < n->expr.nargs; j++)
if (!strcmp(namestr(n->expr.args[j]->expr.idx), declname(dcl[i]))) {
found = 1;
off += writeblob(fd, name, off, globls, strtab, n->expr.args[j]);
}
if (!found)
off += writepad(fd, name, off, size(dcl[i]));
}
end = alignto(off, t);
off += writepad(fd, name, off, end - off);
return off - start;
}
static size_t writeblob(FILE *fd, char *name, size_t off, Htab *globls, Htab *strtab, Node *n)
{
size_t i, sz;
switch(exprop(n)) {
case Otup:
case Oarr:
sz = 0;
for (i = 0; i < n->expr.nargs; i++)
sz += writeblob(fd, name, off + sz, globls, strtab, n->expr.args[i]);
break;
case Ostruct:
sz = writestruct(fd, name, off, globls, strtab, n);
break;
case Olit:
sz = writelit(fd, name, off, strtab, n->expr.args[0], exprtype(n));
break;
case Oslice:
sz = writeslice(fd, name, off, globls, strtab, n);
break;
default:
dump(n, stdout);
die("Nonliteral initializer for global");
break;
}
return sz;
}
static void genstrings(FILE *fd, Htab *strtab)
{
void **k;
char *lbl;
Str *s;
size_t i, nk;
k = htkeys(strtab, &nk);
for (i = 0; i < nk; i++) {
s = k[i];
lbl = htget(strtab, k[i]);
if (s->len) {
fprintf(fd, "GLOBL %s+0(SB),$%lld\n", lbl, (vlong)s->len);
writebytes(fd, lbl, 0, s->buf, s->len);
}
}
}
static void writeasm(FILE *fd, Isel *s, Func *fn)
{
size_t i, j;
char *hidden;
hidden = "";
if (fn->isexport || streq(fn->name, Symprefix "main"))
hidden = "";
/* we don't use the stack size directive: myrddin handles
* the stack frobbing on its own */
fprintf(fd, "TEXT %s%s+0(SB),$0\n", fn->name, hidden);
for (j = 0; j < s->cfg->nbb; j++) {
if (!s->bb[j])
continue;
for (i = 0; i < s->bb[j]->nlbls; i++)
fprintf(fd, "%s:\n", s->bb[j]->lbls[i]);
for (i = 0; i < s->bb[j]->ni; i++)
iprintf(fd, s->bb[j]->il[i]);
}
}
static void genblob(FILE *fd, Node *blob, Htab *globls, Htab *strtab)
{
char *lbl;
/* lits and such also get wrapped in decls */
assert(blob->type == Ndecl);
lbl = htget(globls, blob);
fprintf(fd, "GLOBL %s+0(SB),$%zd\n", lbl, size(blob));
if (blob->decl.init)
writeblob(fd, lbl, 0, globls, strtab, blob->decl.init);
else
writepad(fd, lbl, 0, size(blob));
}
/* genfunc requires all nodes in 'nl' to map cleanly to operations that are
* natively supported, as promised in the output of reduce(). No 64-bit
* operations on x32, no structures, and so on. */
static void genfunc(FILE *fd, Func *fn, Htab *globls, Htab *strtab)
{
Isel is = {0,};
is.reglocs = mkht(varhash, vareq);
is.stkoff = fn->stkoff;
is.globls = globls;
is.ret = fn->ret;
is.cfg = fn->cfg;
selfunc(&is, fn, globls, strtab);
if (debugopt['i'])
writeasm(stdout, &is, fn);
writeasm(fd, &is, fn);
}
static void gentype(FILE *fd, Type *ty)
{
char buf[512];
/* FIXME: this generates dummy data. */
tydescid(buf, sizeof buf, ty);
fprintf(fd, "GLOBL %s%s<>+0(SB),$1\n", Symprefix, buf);
fprintf(fd, "DATA %s%s<>+0(SB)/1,$0\n", Symprefix, buf);
}
void genp9(Node *file, char *out)
{
Htab *globls, *strtab;
Node *n, **blob;
Func **fn;
size_t nfn, nblob;
size_t i;
FILE *fd;
/* ensure that all physical registers have a loc created before any
* other locs, so that locmap[Physreg] maps to the Loc for the physreg
* in question */
for (i = 0; i < Nreg; i++)
locphysreg(i);
fn = NULL;
nfn = 0;
blob = NULL;
nblob = 0;
globls = mkht(varhash, vareq);
initconsts(globls);
/* We need to define all global variables before use */
fillglobls(file->file.globls, globls);
pushstab(file->file.globls);
for (i = 0; i < file->file.nstmts; i++) {
n = file->file.stmts[i];
switch (n->type) {
case Nuse: /* nothing to do */
case Nimpl:
break;
case Ndecl:
simpglobl(n, globls, &fn, &nfn, &blob, &nblob);
break;
default:
die("Bad node %s in toplevel", nodestr[n->type]);
break;
}
}
popstab();
fd = fopen(out, "w");
if (!fd)
die("Couldn't open fd %s", out);
strtab = mkht(strlithash, strliteq);
for (i = 0; i < nblob; i++)
genblob(fd, blob[i], globls, strtab);
for (i = 0; i < nfn; i++)
genfunc(fd, fn[i], globls, strtab);
for (i = 0; i < ntypes; i++)
if (types[i]->isreflect && !types[i]->isimport)
gentype(fd, types[i]);
fprintf(fd, "\n");
genstrings(fd, strtab);
fclose(fd);
}