// Inferno utils/5l/pass.c
// http://code.google.com/p/inferno-os/source/browse/utils/5l/pass.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "l.h"
#include "../ld/lib.h"
void
dodata(void)
{
int i, t;
Sym *s;
Prog *p;
int32 orig, v;
if(debug['v'])
Bprint(&bso, "%5.2f dodata\n", cputime());
Bflush(&bso);
for(p = datap; p != P; p = p->link) {
s = p->from.sym;
if(p->as == ADYNT || p->as == AINIT)
s->value = dtype;
if(s->type == SBSS)
s->type = SDATA;
if(s->type != SDATA)
diag("initialize non-data (%d): %s\n%P",
s->type, s->name, p);
v = p->from.offset + p->reg;
if(v > s->value)
diag("initialize bounds (%ld/%ld): %s\n%P",
v, s->value, s->name, p);
if((s->type == SBSS || s->type == SDATA) && (p->to.type == D_CONST || p->to.type == D_OCONST) && (p->to.name == D_EXTERN || p->to.name == D_STATIC)){
s = p->to.sym;
if(s != S && (s->type == STEXT || s->type == SLEAF || s->type == SCONST || s->type == SXREF))
s->fnptr = 1;
}
}
if(debug['t']) {
/*
* pull out string constants
*/
for(p = datap; p != P; p = p->link) {
s = p->from.sym;
if(p->to.type == D_SCONST)
s->type = SSTRING;
}
}
/*
* pass 1
* assign 'small' variables to data segment
* (rational is that data segment is more easily
* addressed through offset on R12)
*/
orig = 0;
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link) {
t = s->type;
if(t != SDATA && t != SBSS)
continue;
v = s->value;
if(v == 0) {
diag("%s: no size", s->name);
v = 1;
}
while(v & 3)
v++;
s->value = v;
if(v > MINSIZ)
continue;
s->value = orig;
orig += v;
s->type = SDATA1;
}
/*
* pass 2
* assign large 'data' variables to data segment
*/
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link) {
t = s->type;
if(t != SDATA) {
if(t == SDATA1)
s->type = SDATA;
continue;
}
v = s->value;
s->value = orig;
orig += v;
}
while(orig & 7)
orig++;
datsize = orig;
/*
* pass 3
* everything else to bss segment
*/
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link) {
if(s->type != SBSS)
continue;
v = s->value;
s->value = orig;
orig += v;
}
while(orig & 7)
orig++;
bsssize = orig-datsize;
xdefine("setR12", SDATA, 0L+BIG);
xdefine("bdata", SDATA, 0L);
xdefine("data", SBSS, 0);
xdefine("edata", SDATA, datsize);
xdefine("end", SBSS, datsize+bsssize);
xdefine("etext", STEXT, 0L);
}
void
undef(void)
{
int i;
Sym *s;
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link)
if(s->type == SXREF)
diag("%s: not defined", s->name);
}
Prog*
brchain(Prog *p)
{
int i;
for(i=0; i<20; i++) {
if(p == P || p->as != AB)
return p;
p = p->cond;
}
return P;
}
int
relinv(int a)
{
switch(a) {
case ABEQ: return ABNE;
case ABNE: return ABEQ;
case ABCS: return ABCC;
case ABHS: return ABLO;
case ABCC: return ABCS;
case ABLO: return ABHS;
case ABMI: return ABPL;
case ABPL: return ABMI;
case ABVS: return ABVC;
case ABVC: return ABVS;
case ABHI: return ABLS;
case ABLS: return ABHI;
case ABGE: return ABLT;
case ABLT: return ABGE;
case ABGT: return ABLE;
case ABLE: return ABGT;
}
diag("unknown relation: %s", anames[a]);
return a;
}
void
follow(void)
{
if(debug['v'])
Bprint(&bso, "%5.2f follow\n", cputime());
Bflush(&bso);
firstp = prg();
lastp = firstp;
xfol(textp);
firstp = firstp->link;
lastp->link = P;
}
void
xfol(Prog *p)
{
Prog *q, *r;
int a, i;
loop:
if(p == P)
return;
setarch(p);
a = p->as;
if(a == ATEXT)
curtext = p;
if(!curtext->from.sym->reachable) {
p = p->cond;
goto loop;
}
if(a == AB) {
q = p->cond;
if(q != P) {
p->mark |= FOLL;
p = q;
if(!(p->mark & FOLL))
goto loop;
}
}
if(p->mark & FOLL) {
for(i=0,q=p; i<4; i++,q=q->link) {
if(q == lastp)
break;
a = q->as;
if(a == ANOP) {
i--;
continue;
}
if(a == AB || (a == ARET && q->scond == 14) || a == ARFE)
goto copy;
if(!q->cond || (q->cond->mark&FOLL))
continue;
if(a != ABEQ && a != ABNE)
continue;
copy:
for(;;) {
r = prg();
*r = *p;
if(!(r->mark&FOLL))
print("cant happen 1\n");
r->mark |= FOLL;
if(p != q) {
p = p->link;
lastp->link = r;
lastp = r;
continue;
}
lastp->link = r;
lastp = r;
if(a == AB || (a == ARET && q->scond == 14) || a == ARFE)
return;
r->as = ABNE;
if(a == ABNE)
r->as = ABEQ;
r->cond = p->link;
r->link = p->cond;
if(!(r->link->mark&FOLL))
xfol(r->link);
if(!(r->cond->mark&FOLL))
print("cant happen 2\n");
return;
}
}
a = AB;
q = prg();
q->as = a;
q->line = p->line;
q->to.type = D_BRANCH;
q->to.offset = p->pc;
q->cond = p;
p = q;
}
p->mark |= FOLL;
lastp->link = p;
lastp = p;
if(a == AB || (a == ARET && p->scond == 14) || a == ARFE){
return;
}
if(p->cond != P)
if(a != ABL && a != ABX && p->link != P) {
q = brchain(p->link);
if(a != ATEXT && a != ABCASE)
if(q != P && (q->mark&FOLL)) {
p->as = relinv(a);
p->link = p->cond;
p->cond = q;
}
xfol(p->link);
q = brchain(p->cond);
if(q == P)
q = p->cond;
if(q->mark&FOLL) {
p->cond = q;
return;
}
p = q;
goto loop;
}
p = p->link;
goto loop;
}
void
patch(void)
{
int32 c, vexit;
Prog *p, *q;
Sym *s, *s1;
int a;
if(debug['v'])
Bprint(&bso, "%5.2f patch\n", cputime());
Bflush(&bso);
mkfwd();
s = lookup("exit", 0);
vexit = s->value;
for(p = firstp; p != P; p = p->link) {
setarch(p);
a = p->as;
if(a == ATEXT)
curtext = p;
if(seenthumb && a == ABL){
// if((s = p->to.sym) != S && (s1 = curtext->from.sym) != S)
// print("%s calls %s\n", s1->name, s->name);
if((s = p->to.sym) != S && (s1 = curtext->from.sym) != S && s->thumb != s1->thumb)
s->foreign = 1;
}
if((a == ABL || a == ABX || a == AB || a == ARET) &&
p->to.type != D_BRANCH && p->to.sym != S) {
s = p->to.sym;
switch(s->type) {
default:
diag("undefined: %s", s->name);
s->type = STEXT;
s->value = vexit;
continue; // avoid more error messages
case STEXT:
p->to.offset = s->value;
p->to.type = D_BRANCH;
break;
case SUNDEF:
if(p->as != ABL)
diag("help: SUNDEF in AB || ARET");
p->to.offset = 0;
p->to.type = D_BRANCH;
p->cond = UP;
break;
}
}
if(p->to.type != D_BRANCH || p->cond == UP)
continue;
c = p->to.offset;
for(q = firstp; q != P;) {
if(q->forwd != P)
if(c >= q->forwd->pc) {
q = q->forwd;
continue;
}
if(c == q->pc)
break;
q = q->link;
}
if(q == P) {
diag("branch out of range %ld\n%P", c, p);
p->to.type = D_NONE;
}
p->cond = q;
}
for(p = firstp; p != P; p = p->link) {
setarch(p);
a = p->as;
if(p->as == ATEXT)
curtext = p;
if(seenthumb && a == ABL) {
#ifdef CALLEEBX
if(0)
{}
#else
if((s = p->to.sym) != S && (s->foreign || s->fnptr))
p->as = ABX;
#endif
else if(p->to.type == D_OREG)
p->as = ABX;
}
if(p->cond != P && p->cond != UP) {
p->cond = brloop(p->cond);
if(p->cond != P)
if(p->to.type == D_BRANCH)
p->to.offset = p->cond->pc;
}
}
}
#define LOG 5
void
mkfwd(void)
{
Prog *p;
int32 dwn[LOG], cnt[LOG], i;
Prog *lst[LOG];
for(i=0; i<LOG; i++) {
if(i == 0)
cnt[i] = 1; else
cnt[i] = LOG * cnt[i-1];
dwn[i] = 1;
lst[i] = P;
}
i = 0;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
i--;
if(i < 0)
i = LOG-1;
p->forwd = P;
dwn[i]--;
if(dwn[i] <= 0) {
dwn[i] = cnt[i];
if(lst[i] != P)
lst[i]->forwd = p;
lst[i] = p;
}
}
}
Prog*
brloop(Prog *p)
{
Prog *q;
int c;
for(c=0; p!=P;) {
if(p->as != AB)
return p;
q = p->cond;
if(q <= p) {
c++;
if(q == p || c > 5000)
break;
}
p = q;
}
return P;
}
int32
atolwhex(char *s)
{
int32 n;
int f;
n = 0;
f = 0;
while(*s == ' ' || *s == '\t')
s++;
if(*s == '-' || *s == '+') {
if(*s++ == '-')
f = 1;
while(*s == ' ' || *s == '\t')
s++;
}
if(s[0]=='0' && s[1]){
if(s[1]=='x' || s[1]=='X'){
s += 2;
for(;;){
if(*s >= '0' && *s <= '9')
n = n*16 + *s++ - '0';
else if(*s >= 'a' && *s <= 'f')
n = n*16 + *s++ - 'a' + 10;
else if(*s >= 'A' && *s <= 'F')
n = n*16 + *s++ - 'A' + 10;
else
break;
}
} else
while(*s >= '0' && *s <= '7')
n = n*8 + *s++ - '0';
} else
while(*s >= '0' && *s <= '9')
n = n*10 + *s++ - '0';
if(f)
n = -n;
return n;
}
int32
rnd(int32 v, int32 r)
{
int32 c;
if(r <= 0)
return v;
v += r - 1;
c = v % r;
if(c < 0)
c += r;
v -= c;
return v;
}
#define Reachable(n) if((s = lookup(n, 0)) != nil) s->used++
static void
rused(Adr *a)
{
Sym *s = a->sym;
if(s == S)
return;
if(a->type == D_OREG || a->type == D_OCONST || a->type == D_CONST){
if(a->name == D_EXTERN || a->name == D_STATIC){
if(s->used == 0)
s->used = 1;
}
}
else if(a->type == D_BRANCH){
if(s->used == 0)
s->used = 1;
}
}
void
reachable()
{
Prog *p, *prev, *prevt, *nextt, *q;
Sym *s, *s0;
int i, todo;
char *a;
Reachable("_div");
Reachable("_divu");
Reachable("_mod");
Reachable("_modu");
a = INITENTRY;
if(*a >= '0' && *a <= '9')
return;
s = lookup(a, 0);
if(s == nil)
return;
if(s->type == 0){
s->used = 1; // to stop asm complaining
for(p = firstp; p != P && p->as != ATEXT; p = p->link)
;
if(p == nil)
return;
s = p->from.sym;
}
s->used = 1;
do{
todo = 0;
for(p = firstp; p != P; p = p->link){
if(p->as == ATEXT && (s0 = p->from.sym)->used == 1){
todo = 1;
for(q = p->link; q != P && q->as != ATEXT; q = q->link){
rused(&q->from);
rused(&q->to);
}
s0->used = 2;
}
}
for(p = datap; p != P; p = p->link){
if((s0 = p->from.sym)->used == 1){
todo = 1;
for(q = p; q != P; q = q->link){ // data can be scattered
if(q->from.sym == s0)
rused(&q->to);
}
s0->used = 2;
}
}
}while(todo);
prev = nil;
prevt = nextt = nil;
for(p = firstp; p != P; ){
if(p->as == ATEXT){
prevt = nextt;
nextt = p;
}
if(p->as == ATEXT && (s0 = p->from.sym)->used == 0){
s0->type = SREMOVED;
for(q = p->link; q != P && q->as != ATEXT; q = q->link)
;
if(q != p->cond)
diag("bad ptr in reachable()");
if(prev == nil)
firstp = q;
else
prev->link = q;
if(q == nil)
lastp = prev;
if(prevt == nil)
textp = q;
else
prevt->cond = q;
if(q == nil)
etextp = prevt;
nextt = prevt;
if(debug['V'])
print("%s unused\n", s0->name);
p = q;
}
else{
prev = p;
p = p->link;
}
}
prevt = nil;
for(p = datap; p != nil; ){
if((s0 = p->from.sym)->used == 0){
s0->type = SREMOVED;
prev = prevt;
for(q = p; q != nil; q = q->link){
if(q->from.sym == s0){
if(prev == nil)
datap = q->link;
else
prev->link = q->link;
}
else
prev = q;
}
if(debug['V'])
print("%s unused (data)\n", s0->name);
p = prevt->link;
}
else{
prevt = p;
p = p->link;
}
}
for(i=0; i<NHASH; i++){
for(s = hash[i]; s != S; s = s->link){
if(s->used == 0)
s->type = SREMOVED;
}
}
}
static void
fused(Adr *a, Prog *p, Prog *ct)
{
Sym *s = a->sym;
Use *u;
if(s == S)
return;
if(a->type == D_OREG || a->type == D_OCONST || a->type == D_CONST){
if(a->name == D_EXTERN || a->name == D_STATIC){
u = malloc(sizeof(Use));
u->p = p;
u->ct = ct;
u->link = s->use;
s->use = u;
}
}
else if(a->type == D_BRANCH){
u = malloc(sizeof(Use));
u->p = p;
u->ct = ct;
u->link = s->use;
s->use = u;
}
}
static int
ckfpuse(Prog *p, Prog *ct, Sym *fp, Sym *r)
{
int reg;
USED(fp);
USED(ct);
if(p->from.sym == r && p->as == AMOVW && (p->from.type == D_CONST || p->from.type == D_OREG) && p->reg == NREG && p->to.type == D_REG){
reg = p->to.reg;
for(p = p->link; p != P && p->as != ATEXT; p = p->link){
if((p->as == ABL || p->as == ABX) && p->to.type == D_OREG && p->to.reg == reg)
return 1;
if(!debug['F'] && (isbranch(p) || p->as == ARET)){
// print("%s: branch %P in %s\n", fp->name, p, ct->from.sym->name);
return 0;
}
if((p->from.type == D_REG || p->from.type == D_OREG) && p->from.reg == reg){
if(!debug['F'] && p->to.type != D_REG){
// print("%s: store %P in %s\n", fp->name, p, ct->from.sym->name);
return 0;
}
reg = p->to.reg;
}
}
}
// print("%s: no MOVW O(R), R\n", fp->name);
return debug['F'];
}
static void
setfpuse(Prog *p, Sym *fp, Sym *r)
{
int reg;
if(p->from.sym == r && p->as == AMOVW && (p->from.type == D_CONST || p->from.type == D_OREG) && p->reg == NREG && p->to.type == D_REG){
reg = p->to.reg;
for(p = p->link; p != P && p->as != ATEXT; p = p->link){
if((p->as == ABL || p->as == ABX) && p->to.type == D_OREG && p->to.reg == reg){
fp->fnptr = 0;
p->as = ABL; // safe to do so
// print("simplified %s call\n", fp->name);
break;
}
if(!debug['F'] && (isbranch(p) || p->as == ARET))
diag("bad setfpuse call");
if((p->from.type == D_REG || p->from.type == D_OREG) && p->from.reg == reg){
if(!debug['F'] && p->to.type != D_REG)
diag("bad setfpuse call");
reg = p->to.reg;
}
}
}
}
static int
cksymuse(Sym *s, int t)
{
Prog *p;
for(p = datap; p != P; p = p->link){
if(p->from.sym == s && p->to.sym != nil && strcmp(p->to.sym->name, ".string") != 0 && p->to.sym->thumb != t){
// print("%s %s %d %d ", p->from.sym->name, p->to.sym->name, p->to.sym->thumb, t);
return 0;
}
}
return 1;
}
/* check the use of s at the given point */
static int
ckuse(Sym *s, Sym *s0, Use *u)
{
Sym *s1;
s1 = u->p->from.sym;
// print("ckuse %s %s %s\n", s->name, s0->name, s1 ? s1->name : "nil");
if(u->ct == nil){ /* in data area */
if(s0 == s && !cksymuse(s1, s0->thumb)){
// print("%s: cksymuse fails\n", s0->name);
return 0;
}
for(u = s1->use; u != U; u = u->link)
if(!ckuse(s1, s0, u))
return 0;
}
else{ /* in text area */
if(u->ct->from.sym->thumb != s0->thumb){
// print("%s(%d): foreign call %s(%d)\n", s0->name, s0->thumb, u->ct->from.sym->name, u->ct->from.sym->thumb);
return 0;
}
return ckfpuse(u->p, u->ct, s0, s);
}
return 1;
}
static void
setuse(Sym *s, Sym *s0, Use *u)
{
Sym *s1;
s1 = u->p->from.sym;
if(u->ct == nil){ /* in data area */
for(u = s1->use; u != U; u = u->link)
setuse(s1, s0, u);
}
else{ /* in text area */
setfpuse(u->p, s0, s);
}
}
/* detect BX O(R) which can be done as BL O(R) */
void
fnptrs()
{
int i;
Sym *s;
Prog *p;
Use *u;
for(i=0; i<NHASH; i++){
for(s = hash[i]; s != S; s = s->link){
if(s->fnptr && (s->type == STEXT || s->type == SLEAF || s->type == SCONST)){
// print("%s : fnptr %d %d\n", s->name, s->thumb, s->foreign);
}
}
}
/* record use of syms */
for(p = firstp; p != P; p = p->link){
if(p->as == ATEXT)
curtext = p;
else{
fused(&p->from, p, curtext);
fused(&p->to, p, curtext);
}
}
for(p = datap; p != P; p = p->link)
fused(&p->to, p, nil);
/* now look for fn ptrs */
for(i=0; i<NHASH; i++){
for(s = hash[i]; s != S; s = s->link){
if(s->fnptr && (s->type == STEXT || s->type == SLEAF || s->type == SCONST)){
for(u = s->use; u != U; u = u->link){
if(!ckuse(s, s, u))
break;
}
if(u == U){ // can simplify
for(u = s->use; u != U; u = u->link)
setuse(s, s, u);
}
}
}
}
/* now free Use structures */
}
void
import(void)
{
int i;
Sym *s;
for(i = 0; i < NHASH; i++)
for(s = hash[i]; s != S; s = s->link)
if(s->sig != 0 && s->type == SXREF && (nimports == 0 || s->subtype == SIMPORT)){
undefsym(s);
Bprint(&bso, "IMPORT: %s sig=%lux v=%ld\n", s->name, s->sig, s->value);
}
}
void
ckoff(Sym *s, int32 v)
{
if(v < 0 || v >= 1<<Roffset)
diag("relocation offset %ld for %s out of range", v, s->name);
}
Prog*
newdata(Sym *s, int o, int w, int t)
{
Prog *p;
p = prg();
p->link = datap;
datap = p;
p->as = ADATA;
p->reg = w;
p->from.type = D_OREG;
p->from.name = t;
p->from.sym = s;
p->from.offset = o;
p->to.type = D_CONST;
p->to.name = D_NONE;
s->data = p;
return p;
}
void
export(void)
{
int i, j, n, off, nb, sv, ne;
Sym *s, *et, *str, **esyms;
Prog *p;
char buf[NSNAME], *t;
n = 0;
for(i = 0; i < NHASH; i++)
for(s = hash[i]; s != S; s = s->link)
if(s->sig != 0 && s->type != SXREF && s->type != SUNDEF && (nexports == 0 || s->subtype == SEXPORT))
n++;
esyms = malloc(n*sizeof(Sym*));
ne = n;
n = 0;
for(i = 0; i < NHASH; i++)
for(s = hash[i]; s != S; s = s->link)
if(s->sig != 0 && s->type != SXREF && s->type != SUNDEF && (nexports == 0 || s->subtype == SEXPORT))
esyms[n++] = s;
for(i = 0; i < ne-1; i++)
for(j = i+1; j < ne; j++)
if(strcmp(esyms[i]->name, esyms[j]->name) > 0){
s = esyms[i];
esyms[i] = esyms[j];
esyms[j] = s;
}
nb = 0;
off = 0;
et = lookup(EXPTAB, 0);
if(et->type != 0 && et->type != SXREF)
diag("%s already defined", EXPTAB);
et->type = SDATA;
str = lookup(".string", 0);
if(str->type == 0)
str->type = SDATA;
sv = str->value;
for(i = 0; i < ne; i++){
s = esyms[i];
Bprint(&bso, "EXPORT: %s sig=%lux t=%d\n", s->name, s->sig, s->type);
/* signature */
p = newdata(et, off, sizeof(int32), D_EXTERN);
off += sizeof(int32);
p->to.offset = s->sig;
/* address */
p = newdata(et, off, sizeof(int32), D_EXTERN);
off += sizeof(int32);
p->to.name = D_EXTERN;
p->to.sym = s;
/* string */
t = s->name;
n = strlen(t)+1;
for(;;){
buf[nb++] = *t;
sv++;
if(nb >= NSNAME){
p = newdata(str, sv-NSNAME, NSNAME, D_STATIC);
p->to.type = D_SCONST;
p->to.sval = malloc(NSNAME);
memmove(p->to.sval, buf, NSNAME);
nb = 0;
}
if(*t++ == 0)
break;
}
/* name */
p = newdata(et, off, sizeof(int32), D_EXTERN);
off += sizeof(int32);
p->to.name = D_STATIC;
p->to.sym = str;
p->to.offset = sv-n;
}
if(nb > 0){
p = newdata(str, sv-nb, nb, D_STATIC);
p->to.type = D_SCONST;
p->to.sval = malloc(NSNAME);
memmove(p->to.sval, buf, nb);
}
for(i = 0; i < 3; i++){
newdata(et, off, sizeof(int32), D_EXTERN);
off += sizeof(int32);
}
et->value = off;
if(sv == 0)
sv = 1;
str->value = sv;
exports = ne;
free(esyms);
}
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