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gc: make constant arith errors a little more friendly

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Fixes #2804.

R=ken2
CC=golang-dev
https://golang.org/cl/5652067
This commit is contained in:
Russ Cox 2012-02-11 00:50:56 -05:00
parent 2233942e3c
commit 337547d1c9
9 changed files with 55 additions and 33 deletions
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2
src/cmd/gc/const.c
View File

@ -589,7 +589,7 @@ evconst(Node *n)
case TUP(OADD, CTINT):
case TUP(OADD, CTRUNE):
mpaddfixfix(v.u.xval, rv.u.xval);
mpaddfixfix(v.u.xval, rv.u.xval, 0);
break;
case TUP(OSUB, CTINT):
case TUP(OSUB, CTRUNE):

2
src/cmd/gc/go.h
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@ -1049,7 +1049,7 @@ void mpsubfltflt(Mpflt *a, Mpflt *b);
/*
* mparith2.c
*/
void mpaddfixfix(Mpint *a, Mpint *b);
void mpaddfixfix(Mpint *a, Mpint *b, int);
void mpandfixfix(Mpint *a, Mpint *b);
void mpandnotfixfix(Mpint *a, Mpint *b);
void mpdivfract(Mpint *a, Mpint *b);

2
src/cmd/gc/go.y
View File

@ -2027,7 +2027,7 @@ hidden_constant:
{
if($2->val.ctype == CTRUNE && $4->val.ctype == CTINT) {
$$ = $2;
mpaddfixfix($2->val.u.xval, $4->val.u.xval);
mpaddfixfix($2->val.u.xval, $4->val.u.xval, 0);
break;
}
$$ = nodcplxlit($2->val, $4->val);

10
src/cmd/gc/mparith1.c
View File

@ -72,7 +72,7 @@ void
mpsubfixfix(Mpint *a, Mpint *b)
{
mpnegfix(a);
mpaddfixfix(a, b);
mpaddfixfix(a, b, 0);
mpnegfix(a);
}
@ -90,7 +90,7 @@ mpaddcfix(Mpint *a, vlong c)
Mpint b;
mpmovecfix(&b, c);
mpaddfixfix(a, &b);
mpaddfixfix(a, &b, 0);
}
void
@ -302,7 +302,7 @@ mpatoflt(Mpflt *a, char *as)
if(c >= '0' && c <= '9') {
ex = ex*10 + (c-'0');
if(ex > 1e8) {
yyerror("exponent out of range");
yyerror("constant exponent out of range: %s", as);
errorexit();
}
continue;
@ -343,7 +343,7 @@ out:
return;
bad:
yyerror("set ovf in mpatof");
yyerror("constant too large: %s", as);
mpmovecflt(a, 0.0);
}
@ -431,7 +431,7 @@ out:
return;
bad:
yyerror("set ovf in mpatov: %s", as);
yyerror("constant too large: %s", as);
mpmovecfix(a, 0);
}

49
src/cmd/gc/mparith2.c
View File

@ -121,7 +121,8 @@ mpcmp(Mpint *a, Mpint *b)
int i;
if(a->ovf || b->ovf) {
yyerror("ovf in cmp");
if(nsavederrors+nerrors == 0)
yyerror("ovf in cmp");
return 0;
}
@ -190,13 +191,14 @@ mpshiftfix(Mpint *a, int s)
/// implements fix arihmetic
void
mpaddfixfix(Mpint *a, Mpint *b)
mpaddfixfix(Mpint *a, Mpint *b, int quiet)
{
int i, c;
long x, *a1, *b1;
if(a->ovf || b->ovf) {
yyerror("ovf in mpaddxx");
if(nsavederrors+nerrors == 0)
yyerror("ovf in mpaddxx");
a->ovf = 1;
return;
}
@ -218,8 +220,8 @@ mpaddfixfix(Mpint *a, Mpint *b)
*a1++ = x;
}
a->ovf = c;
if(a->ovf)
yyerror("set ovf in mpaddxx");
if(a->ovf && !quiet)
yyerror("constant addition overflow");
return;
@ -266,7 +268,8 @@ mpmulfixfix(Mpint *a, Mpint *b)
Mpint s, q;
if(a->ovf || b->ovf) {
yyerror("ovf in mpmulfixfix");
if(nsavederrors+nerrors == 0)
yyerror("ovf in mpmulfixfix");
a->ovf = 1;
return;
}
@ -290,7 +293,7 @@ mpmulfixfix(Mpint *a, Mpint *b)
x = *a1++;
for(j=0; j<Mpscale; j++) {
if(x & 1)
mpaddfixfix(&q, &s);
mpaddfixfix(&q, &s, 1);
mplsh(&s);
x >>= 1;
}
@ -299,7 +302,7 @@ mpmulfixfix(Mpint *a, Mpint *b)
q.neg = a->neg ^ b->neg;
mpmovefixfix(a, &q);
if(a->ovf)
yyerror("set ovf in mpmulfixfix");
yyerror("constant multiplication overflow");
}
void
@ -311,7 +314,8 @@ mpmulfract(Mpint *a, Mpint *b)
Mpint s, q;
if(a->ovf || b->ovf) {
yyerror("ovf in mpmulflt");
if(nsavederrors+nerrors == 0)
yyerror("ovf in mpmulflt");
a->ovf = 1;
return;
}
@ -334,7 +338,7 @@ mpmulfract(Mpint *a, Mpint *b)
for(j=0; j<Mpscale; j++) {
x <<= 1;
if(x & Mpbase)
mpaddfixfix(&q, &s);
mpaddfixfix(&q, &s, 1);
mprsh(&s);
}
}
@ -342,7 +346,7 @@ mpmulfract(Mpint *a, Mpint *b)
q.neg = a->neg ^ b->neg;
mpmovefixfix(a, &q);
if(a->ovf)
yyerror("set ovf in mpmulflt");
yyerror("constant multiplication overflow");
}
void
@ -353,7 +357,8 @@ mporfixfix(Mpint *a, Mpint *b)
x = 0;
if(a->ovf || b->ovf) {
yyerror("ovf in mporfixfix");
if(nsavederrors+nerrors == 0)
yyerror("ovf in mporfixfix");
mpmovecfix(a, 0);
a->ovf = 1;
return;
@ -388,7 +393,8 @@ mpandfixfix(Mpint *a, Mpint *b)
x = 0;
if(a->ovf || b->ovf) {
yyerror("ovf in mpandfixfix");
if(nsavederrors+nerrors == 0)
yyerror("ovf in mpandfixfix");
mpmovecfix(a, 0);
a->ovf = 1;
return;
@ -423,7 +429,8 @@ mpandnotfixfix(Mpint *a, Mpint *b)
x = 0;
if(a->ovf || b->ovf) {
yyerror("ovf in mpandnotfixfix");
if(nsavederrors+nerrors == 0)
yyerror("ovf in mpandnotfixfix");
mpmovecfix(a, 0);
a->ovf = 1;
return;
@ -458,7 +465,8 @@ mpxorfixfix(Mpint *a, Mpint *b)
x = 0;
if(a->ovf || b->ovf) {
yyerror("ovf in mporfixfix");
if(nsavederrors+nerrors == 0)
yyerror("ovf in mporfixfix");
mpmovecfix(a, 0);
a->ovf = 1;
return;
@ -491,7 +499,8 @@ mplshfixfix(Mpint *a, Mpint *b)
vlong s;
if(a->ovf || b->ovf) {
yyerror("ovf in mporfixfix");
if(nsavederrors+nerrors == 0)
yyerror("ovf in mporfixfix");
mpmovecfix(a, 0);
a->ovf = 1;
return;
@ -512,7 +521,8 @@ mprshfixfix(Mpint *a, Mpint *b)
vlong s;
if(a->ovf || b->ovf) {
yyerror("ovf in mprshfixfix");
if(nsavederrors+nerrors == 0)
yyerror("ovf in mprshfixfix");
mpmovecfix(a, 0);
a->ovf = 1;
return;
@ -542,7 +552,8 @@ mpgetfix(Mpint *a)
vlong v;
if(a->ovf) {
yyerror("constant overflow");
if(nsavederrors+nerrors == 0)
yyerror("constant overflow");
return 0;
}
@ -605,7 +616,7 @@ mpdivmodfixfix(Mpint *q, Mpint *r, Mpint *n, Mpint *d)
r->ovf = 1;
n->neg = ns;
d->neg = ds;
yyerror("set ovf in mpdivmodfixfix");
yyerror("constant division overflow");
return;
}

10
src/cmd/gc/mparith3.c
View File

@ -89,17 +89,17 @@ mpaddfltflt(Mpflt *a, Mpflt *b)
// a is larger, shift b right
mpmovefltflt(&c, b);
mpshiftfix(&c.val, -s);
mpaddfixfix(&a->val, &c.val);
mpaddfixfix(&a->val, &c.val, 0);
goto out;
}
if(s < 0) {
// b is larger, shift a right
mpshiftfix(&a->val, s);
a->exp -= s;
mpaddfixfix(&a->val, &b->val);
mpaddfixfix(&a->val, &b->val, 0);
goto out;
}
mpaddfixfix(&a->val, &b->val);
mpaddfixfix(&a->val, &b->val, 0);
out:
mpnorm(a);
@ -153,7 +153,7 @@ mpdivfltflt(Mpflt *a, Mpflt *b)
a->exp = 0;
a->val.neg = 0;
a->val.ovf = 1;
yyerror("mpdivfltflt divide by zero");
yyerror("constant division by zero");
return;
}
@ -185,7 +185,7 @@ mpgetflt(Mpflt *a)
uvlong v, vm;
double f;
if(a->val.ovf)
if(a->val.ovf && nsavederrors+nerrors == 0)
yyerror("mpgetflt ovf");
s = sigfig(a);

2
src/cmd/gc/y.tab.c
View File

@ -5188,7 +5188,7 @@ yyreduce:
{
if((yyvsp[(2) - (5)].node)->val.ctype == CTRUNE && (yyvsp[(4) - (5)].node)->val.ctype == CTINT) {
(yyval.node) = (yyvsp[(2) - (5)].node);
mpaddfixfix((yyvsp[(2) - (5)].node)->val.u.xval, (yyvsp[(4) - (5)].node)->val.u.xval);
mpaddfixfix((yyvsp[(2) - (5)].node)->val.u.xval, (yyvsp[(4) - (5)].node)->val.u.xval, 0);
break;
}
(yyval.node) = nodcplxlit((yyvsp[(2) - (5)].node)->val, (yyvsp[(4) - (5)].node)->val);

7
src/cmd/go/build.go
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@ -671,6 +671,13 @@ func (b *builder) install(a *action) error {
}
}
// remove object dir to keep the amount of
// garbage down in a large build. On an operating system
// with aggressive buffering, cleaning incrementally like
// this keeps the intermediate objects from hitting the disk.
defer os.RemoveAll(a1.objdir)
defer os.Remove(a1.target)
return b.copyFile(a.target, a1.target, perm)
}

4
test/const2.go
View File

@ -10,3 +10,7 @@ const (
A int = 1
B byte; // ERROR "type without expr|expected .=."
)
const LargeA = 1000000000000000000
const LargeB = LargeA * LargeA * LargeA
const LargeC = LargeB * LargeB * LargeB // ERROR "constant multiplication overflow"