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cmd/compile/internal/gc: avoid potential endless loop in float printing

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The compiler should not usually call Fconv with an infinity, but if
it does, Fconv will end in an endless loop. Test for infinities early.

Change-Id: I48f366466538b0bd26a851e01258725025babaff
Reviewed-on: https://go-review.googlesource.com/16777
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Robert Griesemer 2015-11-10 11:32:26 -08:00
parent 2fdff9586b
commit 50fa646776
1 changed files with 5 additions and 0 deletions
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5
src/cmd/compile/internal/gc/mparith3.go
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@ -207,6 +207,11 @@ func Fconv(fvp *Mpflt, flag int) string {
sign = "+"
}
// Don't try to convert infinities (will not terminate).
if f.IsInf() {
return sign + "Inf"
}
// Use fmt formatting if in float64 range (common case).
if x, _ := f.Float64(); !math.IsInf(x, 0) {
return fmt.Sprintf("%s%.6g", sign, x)