mirror of
https://github.com/golang/go
synced 2024-11-18 12:44:49 -07:00
bug in stack size used in
extending segmented stack R=r OCL=27319 CL=27319
This commit is contained in:
Ken Thompson
parent
78edbfdcf4
commit
cb15bbe748
@ -37,7 +37,7 @@ argsize(void)
|
||||
int32 s;
|
||||
|
||||
//print("t=%T\n", thisfn);
|
||||
s = 0;
|
||||
s = align(0, thisfn->link, Aarg0);
|
||||
for(t=thisfn->down; t!=T; t=t->down) {
|
||||
switch(t->etype) {
|
||||
case TVOID:
|
||||
|
||||
@ -1,550 +0,0 @@
|
||||
// Inferno utils/6c/sgen.c
|
||||
// http://code.google.com/p/inferno-os/source/browse/utils/6c/sgen.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 "gc.h"
|
||||
|
||||
void
|
||||
codgen(Node *n, Node *nn)
|
||||
{
|
||||
Prog *sp;
|
||||
Node *n1, nod, nod1;
|
||||
|
||||
cursafe = 0;
|
||||
curarg = 0;
|
||||
maxargsafe = 0;
|
||||
|
||||
/*
|
||||
* isolate name
|
||||
*/
|
||||
for(n1 = nn;; n1 = n1->left) {
|
||||
if(n1 == Z) {
|
||||
diag(nn, "cant find function name");
|
||||
return;
|
||||
}
|
||||
if(n1->op == ONAME)
|
||||
break;
|
||||
}
|
||||
nearln = nn->lineno;
|
||||
gpseudo(ATEXT, n1->sym, nodconst(stkoff));
|
||||
sp = p;
|
||||
|
||||
/*
|
||||
* isolate first argument
|
||||
*/
|
||||
if(REGARG) {
|
||||
if(typecmplx[thisfn->link->etype]) {
|
||||
nod1 = *nodret->left;
|
||||
nodreg(&nod, &nod1, REGARG);
|
||||
gmove(&nod, &nod1);
|
||||
} else
|
||||
if(firstarg && typeword[firstargtype->etype]) {
|
||||
nod1 = *nodret->left;
|
||||
nod1.sym = firstarg;
|
||||
nod1.type = firstargtype;
|
||||
nod1.xoffset = align(0, firstargtype, Aarg1);
|
||||
nod1.etype = firstargtype->etype;
|
||||
nodreg(&nod, &nod1, REGARG);
|
||||
gmove(&nod, &nod1);
|
||||
}
|
||||
}
|
||||
|
||||
canreach = 1;
|
||||
warnreach = 1;
|
||||
gen(n);
|
||||
if(canreach && thisfn->link->etype != TVOID)
|
||||
warn(Z, "no return at end of function: %s", n1->sym->name);
|
||||
noretval(3);
|
||||
gbranch(ORETURN);
|
||||
|
||||
if(!debug['N'] || debug['R'] || debug['P'])
|
||||
regopt(sp);
|
||||
|
||||
if(thechar=='6' || thechar=='7') /* [sic] */
|
||||
maxargsafe = xround(maxargsafe, 8);
|
||||
sp->to.offset += maxargsafe;
|
||||
}
|
||||
|
||||
void
|
||||
supgen(Node *n)
|
||||
{
|
||||
int owarn;
|
||||
int32 spc;
|
||||
Prog *sp;
|
||||
|
||||
if(n == Z)
|
||||
return;
|
||||
suppress++;
|
||||
owarn = warnreach;
|
||||
warnreach = 0;
|
||||
spc = pc;
|
||||
sp = lastp;
|
||||
gen(n);
|
||||
lastp = sp;
|
||||
pc = spc;
|
||||
sp->link = nil;
|
||||
suppress--;
|
||||
warnreach = owarn;
|
||||
}
|
||||
|
||||
void
|
||||
gen(Node *n)
|
||||
{
|
||||
Node *l, nod;
|
||||
Prog *sp, *spc, *spb;
|
||||
Case *cn;
|
||||
int32 sbc, scc;
|
||||
int snbreak, sncontin;
|
||||
int f, o, oldreach;
|
||||
|
||||
loop:
|
||||
if(n == Z)
|
||||
return;
|
||||
nearln = n->lineno;
|
||||
o = n->op;
|
||||
if(debug['G'])
|
||||
if(o != OLIST)
|
||||
print("%L %O\n", nearln, o);
|
||||
|
||||
if(!canreach) {
|
||||
switch(o) {
|
||||
case OLABEL:
|
||||
case OCASE:
|
||||
case OLIST:
|
||||
case OBREAK:
|
||||
case OFOR:
|
||||
case OWHILE:
|
||||
case ODWHILE:
|
||||
/* all handled specially - see switch body below */
|
||||
break;
|
||||
default:
|
||||
if(warnreach) {
|
||||
warn(n, "unreachable code %O", o);
|
||||
warnreach = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
switch(o) {
|
||||
|
||||
default:
|
||||
complex(n);
|
||||
cgen(n, Z);
|
||||
break;
|
||||
|
||||
case OLIST:
|
||||
gen(n->left);
|
||||
|
||||
rloop:
|
||||
n = n->right;
|
||||
goto loop;
|
||||
|
||||
case ORETURN:
|
||||
canreach = 0;
|
||||
warnreach = !suppress;
|
||||
complex(n);
|
||||
if(n->type == T)
|
||||
break;
|
||||
l = n->left;
|
||||
if(l == Z) {
|
||||
noretval(3);
|
||||
gbranch(ORETURN);
|
||||
break;
|
||||
}
|
||||
if(typecmplx[n->type->etype]) {
|
||||
sugen(l, nodret, n->type->width);
|
||||
noretval(3);
|
||||
gbranch(ORETURN);
|
||||
break;
|
||||
}
|
||||
regret(&nod, n);
|
||||
cgen(l, &nod);
|
||||
regfree(&nod);
|
||||
if(typefd[n->type->etype])
|
||||
noretval(1);
|
||||
else
|
||||
noretval(2);
|
||||
gbranch(ORETURN);
|
||||
break;
|
||||
|
||||
case OLABEL:
|
||||
canreach = 1;
|
||||
l = n->left;
|
||||
if(l) {
|
||||
l->pc = pc;
|
||||
if(l->label)
|
||||
patch(l->label, pc);
|
||||
}
|
||||
gbranch(OGOTO); /* prevent self reference in reg */
|
||||
patch(p, pc);
|
||||
goto rloop;
|
||||
|
||||
case OGOTO:
|
||||
canreach = 0;
|
||||
warnreach = !suppress;
|
||||
n = n->left;
|
||||
if(n == Z)
|
||||
return;
|
||||
if(n->complex == 0) {
|
||||
diag(Z, "label undefined: %s", n->sym->name);
|
||||
return;
|
||||
}
|
||||
if(suppress)
|
||||
return;
|
||||
gbranch(OGOTO);
|
||||
if(n->pc) {
|
||||
patch(p, n->pc);
|
||||
return;
|
||||
}
|
||||
if(n->label)
|
||||
patch(n->label, pc-1);
|
||||
n->label = p;
|
||||
return;
|
||||
|
||||
case OCASE:
|
||||
canreach = 1;
|
||||
l = n->left;
|
||||
if(cases == C)
|
||||
diag(n, "case/default outside a switch");
|
||||
if(l == Z) {
|
||||
cas();
|
||||
cases->val = 0;
|
||||
cases->def = 1;
|
||||
cases->label = pc;
|
||||
cases->isv = 0;
|
||||
goto rloop;
|
||||
}
|
||||
complex(l);
|
||||
if(l->type == T)
|
||||
goto rloop;
|
||||
if(l->op == OCONST)
|
||||
if(typeword[l->type->etype] && l->type->etype != TIND) {
|
||||
cas();
|
||||
cases->val = l->vconst;
|
||||
cases->def = 0;
|
||||
cases->label = pc;
|
||||
cases->isv = typev[l->type->etype];
|
||||
goto rloop;
|
||||
}
|
||||
diag(n, "case expression must be integer constant");
|
||||
goto rloop;
|
||||
|
||||
case OSWITCH:
|
||||
l = n->left;
|
||||
complex(l);
|
||||
if(l->type == T)
|
||||
break;
|
||||
if(!typeword[l->type->etype] || l->type->etype == TIND) {
|
||||
diag(n, "switch expression must be integer");
|
||||
break;
|
||||
}
|
||||
|
||||
gbranch(OGOTO); /* entry */
|
||||
sp = p;
|
||||
|
||||
cn = cases;
|
||||
cases = C;
|
||||
cas();
|
||||
|
||||
sbc = breakpc;
|
||||
breakpc = pc;
|
||||
snbreak = nbreak;
|
||||
nbreak = 0;
|
||||
gbranch(OGOTO);
|
||||
spb = p;
|
||||
|
||||
gen(n->right); /* body */
|
||||
if(canreach){
|
||||
gbranch(OGOTO);
|
||||
patch(p, breakpc);
|
||||
nbreak++;
|
||||
}
|
||||
|
||||
patch(sp, pc);
|
||||
regalloc(&nod, l, Z);
|
||||
/* always signed */
|
||||
if(typev[l->type->etype])
|
||||
nod.type = types[TVLONG];
|
||||
else
|
||||
nod.type = types[TLONG];
|
||||
cgen(l, &nod);
|
||||
doswit(&nod);
|
||||
regfree(&nod);
|
||||
patch(spb, pc);
|
||||
|
||||
cases = cn;
|
||||
breakpc = sbc;
|
||||
canreach = nbreak!=0;
|
||||
if(canreach == 0)
|
||||
warnreach = !suppress;
|
||||
nbreak = snbreak;
|
||||
break;
|
||||
|
||||
case OWHILE:
|
||||
case ODWHILE:
|
||||
l = n->left;
|
||||
gbranch(OGOTO); /* entry */
|
||||
sp = p;
|
||||
|
||||
scc = continpc;
|
||||
continpc = pc;
|
||||
gbranch(OGOTO);
|
||||
spc = p;
|
||||
|
||||
sbc = breakpc;
|
||||
breakpc = pc;
|
||||
snbreak = nbreak;
|
||||
nbreak = 0;
|
||||
gbranch(OGOTO);
|
||||
spb = p;
|
||||
|
||||
patch(spc, pc);
|
||||
if(n->op == OWHILE)
|
||||
patch(sp, pc);
|
||||
bcomplex(l, Z); /* test */
|
||||
patch(p, breakpc);
|
||||
if(l->op != OCONST || vconst(l) == 0)
|
||||
nbreak++;
|
||||
|
||||
if(n->op == ODWHILE)
|
||||
patch(sp, pc);
|
||||
gen(n->right); /* body */
|
||||
gbranch(OGOTO);
|
||||
patch(p, continpc);
|
||||
|
||||
patch(spb, pc);
|
||||
continpc = scc;
|
||||
breakpc = sbc;
|
||||
canreach = nbreak!=0;
|
||||
if(canreach == 0)
|
||||
warnreach = !suppress;
|
||||
nbreak = snbreak;
|
||||
break;
|
||||
|
||||
case OFOR:
|
||||
l = n->left;
|
||||
if(!canreach && l->right->left && warnreach) {
|
||||
warn(n, "unreachable code FOR");
|
||||
warnreach = 0;
|
||||
}
|
||||
gen(l->right->left); /* init */
|
||||
gbranch(OGOTO); /* entry */
|
||||
sp = p;
|
||||
|
||||
/*
|
||||
* if there are no incoming labels in the
|
||||
* body and the top's not reachable, warn
|
||||
*/
|
||||
if(!canreach && warnreach && deadheads(n)) {
|
||||
warn(n, "unreachable code %O", o);
|
||||
warnreach = 0;
|
||||
}
|
||||
|
||||
scc = continpc;
|
||||
continpc = pc;
|
||||
gbranch(OGOTO);
|
||||
spc = p;
|
||||
|
||||
sbc = breakpc;
|
||||
breakpc = pc;
|
||||
snbreak = nbreak;
|
||||
nbreak = 0;
|
||||
sncontin = ncontin;
|
||||
ncontin = 0;
|
||||
gbranch(OGOTO);
|
||||
spb = p;
|
||||
|
||||
patch(spc, pc);
|
||||
gen(l->right->right); /* inc */
|
||||
patch(sp, pc);
|
||||
if(l->left != Z) { /* test */
|
||||
bcomplex(l->left, Z);
|
||||
patch(p, breakpc);
|
||||
if(l->left->op != OCONST || vconst(l->left) == 0)
|
||||
nbreak++;
|
||||
}
|
||||
canreach = 1;
|
||||
gen(n->right); /* body */
|
||||
if(canreach){
|
||||
gbranch(OGOTO);
|
||||
patch(p, continpc);
|
||||
ncontin++;
|
||||
}
|
||||
if(!ncontin && l->right->right && warnreach) {
|
||||
warn(l->right->right, "unreachable FOR inc");
|
||||
warnreach = 0;
|
||||
}
|
||||
|
||||
patch(spb, pc);
|
||||
continpc = scc;
|
||||
breakpc = sbc;
|
||||
canreach = nbreak!=0;
|
||||
if(canreach == 0)
|
||||
warnreach = !suppress;
|
||||
nbreak = snbreak;
|
||||
ncontin = sncontin;
|
||||
break;
|
||||
|
||||
case OCONTINUE:
|
||||
if(continpc < 0) {
|
||||
diag(n, "continue not in a loop");
|
||||
break;
|
||||
}
|
||||
gbranch(OGOTO);
|
||||
patch(p, continpc);
|
||||
ncontin++;
|
||||
canreach = 0;
|
||||
warnreach = !suppress;
|
||||
break;
|
||||
|
||||
case OBREAK:
|
||||
if(breakpc < 0) {
|
||||
diag(n, "break not in a loop");
|
||||
break;
|
||||
}
|
||||
/*
|
||||
* Don't complain about unreachable break statements.
|
||||
* There are breaks hidden in yacc's output and some people
|
||||
* write return; break; in their switch statements out of habit.
|
||||
* However, don't confuse the analysis by inserting an
|
||||
* unreachable reference to breakpc either.
|
||||
*/
|
||||
if(!canreach)
|
||||
break;
|
||||
gbranch(OGOTO);
|
||||
patch(p, breakpc);
|
||||
nbreak++;
|
||||
canreach = 0;
|
||||
warnreach = !suppress;
|
||||
break;
|
||||
|
||||
case OIF:
|
||||
l = n->left;
|
||||
if(bcomplex(l, n->right)) {
|
||||
if(typefd[l->type->etype])
|
||||
f = !l->fconst;
|
||||
else
|
||||
f = !l->vconst;
|
||||
if(debug['c'])
|
||||
print("%L const if %s\n", nearln, f ? "false" : "true");
|
||||
if(f) {
|
||||
canreach = 1;
|
||||
supgen(n->right->left);
|
||||
oldreach = canreach;
|
||||
canreach = 1;
|
||||
gen(n->right->right);
|
||||
/*
|
||||
* treat constant ifs as regular ifs for
|
||||
* reachability warnings.
|
||||
*/
|
||||
if(!canreach && oldreach && debug['w'] < 2)
|
||||
warnreach = 0;
|
||||
}
|
||||
else {
|
||||
canreach = 1;
|
||||
gen(n->right->left);
|
||||
oldreach = canreach;
|
||||
canreach = 1;
|
||||
supgen(n->right->right);
|
||||
/*
|
||||
* treat constant ifs as regular ifs for
|
||||
* reachability warnings.
|
||||
*/
|
||||
if(!oldreach && canreach && debug['w'] < 2)
|
||||
warnreach = 0;
|
||||
canreach = oldreach;
|
||||
}
|
||||
}
|
||||
else {
|
||||
sp = p;
|
||||
canreach = 1;
|
||||
if(n->right->left != Z)
|
||||
gen(n->right->left);
|
||||
oldreach = canreach;
|
||||
canreach = 1;
|
||||
if(n->right->right != Z) {
|
||||
gbranch(OGOTO);
|
||||
patch(sp, pc);
|
||||
sp = p;
|
||||
gen(n->right->right);
|
||||
}
|
||||
patch(sp, pc);
|
||||
canreach = canreach || oldreach;
|
||||
if(canreach == 0)
|
||||
warnreach = !suppress;
|
||||
}
|
||||
break;
|
||||
|
||||
case OSET:
|
||||
case OUSED:
|
||||
usedset(n->left, o);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
usedset(Node *n, int o)
|
||||
{
|
||||
if(n->op == OLIST) {
|
||||
usedset(n->left, o);
|
||||
usedset(n->right, o);
|
||||
return;
|
||||
}
|
||||
complex(n);
|
||||
switch(n->op) {
|
||||
case OADDR: /* volatile */
|
||||
gins(ANOP, n, Z);
|
||||
break;
|
||||
case ONAME:
|
||||
if(o == OSET)
|
||||
gins(ANOP, Z, n);
|
||||
else
|
||||
gins(ANOP, n, Z);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
int
|
||||
bcomplex(Node *n, Node *c)
|
||||
{
|
||||
|
||||
complex(n);
|
||||
if(n->type != T)
|
||||
if(tcompat(n, T, n->type, tnot))
|
||||
n->type = T;
|
||||
if(n->type == T) {
|
||||
gbranch(OGOTO);
|
||||
return 0;
|
||||
}
|
||||
if(c != Z && n->op == OCONST && deadheads(c))
|
||||
return 1;
|
||||
bool64(n);
|
||||
boolgen(n, 1, Z);
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user