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cmd/compile: keep JMPs around with -N

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When -N, make sure we don't drop every instruction from
a block, even ones which would otherwise be empty.
Helps keep line numbers around for debugging, particularly
for break and continue statements (which often compile
down to nothing).

Fixes #14379

Change-Id: I33722c4f0dcd502f146fa48af262ba3a477c959a
Reviewed-on: https://go-review.googlesource.com/19854
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
This commit is contained in:
Keith Randall 2016-02-23 10:54:36 -08:00
parent c4cb365ea2
commit e360f7c4db
6 changed files with 20 additions and 12 deletions
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4
src/cmd/internal/obj/objfile.go
View file

@ -295,7 +295,9 @@ func Flushplist(ctxt *Link) {
for s := text; s != nil; s = s.Next {
mkfwd(s)
linkpatch(ctxt, s)
ctxt.Arch.Follow(ctxt, s)
if ctxt.Flag_optimize {
ctxt.Arch.Follow(ctxt, s)
}
ctxt.Arch.Preprocess(ctxt, s)
ctxt.Arch.Assemble(ctxt, s)
fieldtrack(ctxt, s)