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cmd/internal/objabi: support boolean GOEXPERIMENTs

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Currently, objabi exports GOEXPERIMENT flags as ints that are either 0
or 1. Since the dawn of time, there's been a comment saying that we
*could* support general integers here, but it's never happened and all
the "== 0" and "!= 0" and "== 1" are driving me crazy and are making
the code harder to read and maintain. Hence, this CL adds support for
boolean GOEXPERIMENT flags. We'll introduce some bool-typed flags in
the next CL.

Change-Id: I7813400db130a9b8f71a644fe7912808dbe645bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/302069
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Austin Clements 2021-03-15 16:23:21 -04:00
parent 6461d74bf2
commit af4388aee1
1 changed files with 20 additions and 8 deletions
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28
src/cmd/internal/objabi/util.go
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@ -157,17 +157,22 @@ func init() {
var Framepointer_enabled = GOARCH == "amd64" || GOARCH == "arm64"
func addexp(s string) {
// Could do general integer parsing here, but the runtime copy doesn't yet.
v := 1
// Could do general integer parsing here, but the runtime.haveexperiment doesn't yet.
v, vb := 1, true
name := s
if len(name) > 2 && name[:2] == "no" {
v = 0
v, vb = 0, false
name = name[2:]
}
for i := 0; i < len(exper); i++ {
if exper[i].name == name {
if exper[i].val != nil {
*exper[i].val = v
switch val := exper[i].val.(type) {
case *int:
*val = v
case *bool:
*val = vb
default:
panic("bad GOEXPERIMENT type for " + s)
}
return
}
@ -189,7 +194,7 @@ var (
// variable recorded when the toolchain is built.
var exper = []struct {
name string
val *int
val interface{} // Must be *int or *bool
}{
{"fieldtrack", &Fieldtrack_enabled},
{"preemptibleloops", &Preemptibleloops_enabled},
@ -204,8 +209,15 @@ var defaultExpstring string
func expList() string {
buf := ""
for i := range exper {
if *exper[i].val != 0 {
buf += "," + exper[i].name
switch val := exper[i].val.(type) {
case *int:
if *val != 0 {
buf += "," + exper[i].name
}
case *bool:
if *val {
buf += "," + exper[i].name
}
}
}
if len(buf) == 0 {