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internal/buildcfg: make regabi an alias for regabi sub-experiments
Currently, specifying GOEXPERIMENT=regabi will turn on all regabi sub-experiments, but GOEXPERIMENT=noregabi won't turn anything off. Regabi also isn't a "real" experiment in the sense that nothing in the code base should depend on it as an experiment flag (it should depend on the appropriate sub-experiments). Hence, drop Regabi from goexperiment.Flags and make "regabi" in GOEXPERIMENT be a real alias for all of the sub-flags, so regabi will turn on all of the sub-flags and noregabi will turn off all of the sub-flags. This way, once we enable the sub-experiments in the baseline configuration, it will be easy to turn off with "noregabi". For #40724. Change-Id: I0fb95be42f756d412e729a396be607d629ae2bab Reviewed-on: https://go-review.googlesource.com/c/go/+/310609 Trust: Austin Clements <austin@google.com> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
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@ -45,12 +45,25 @@ func parseExperiments() goexperiment.Flags {
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if env != "" {
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// Create a map of known experiment names.
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names := make(map[string]reflect.Value)
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names := make(map[string]func(bool))
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rv := reflect.ValueOf(&flags).Elem()
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rt := rv.Type()
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for i := 0; i < rt.NumField(); i++ {
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field := rv.Field(i)
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names[strings.ToLower(rt.Field(i).Name)] = field
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names[strings.ToLower(rt.Field(i).Name)] = field.SetBool
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}
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// "regabi" is an alias for all working regabi
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// subexperiments, and not an experiment itself. Doing
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// this as an alias make both "regabi" and "noregabi"
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// do the right thing.
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names["regabi"] = func(v bool) {
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flags.RegabiWrappers = v
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flags.RegabiG = v
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flags.RegabiReflect = v
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flags.RegabiDefer = v
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// Not ready yet:
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//flags.RegabiArgs = v
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}
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// Parse names.
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@ -69,33 +82,23 @@ func parseExperiments() goexperiment.Flags {
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if strings.HasPrefix(f, "no") {
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f, val = f[2:], false
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}
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field, ok := names[f]
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set, ok := names[f]
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if !ok {
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fmt.Printf("unknown experiment %s\n", f)
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os.Exit(2)
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}
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field.SetBool(val)
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set(val)
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}
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}
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// regabi is only supported on amd64.
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if GOARCH != "amd64" {
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flags.Regabi = false
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flags.RegabiWrappers = false
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flags.RegabiG = false
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flags.RegabiReflect = false
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flags.RegabiDefer = false
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flags.RegabiArgs = false
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}
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// Setting regabi sets working sub-experiments.
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if flags.Regabi {
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flags.RegabiWrappers = true
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flags.RegabiG = true
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flags.RegabiReflect = true
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flags.RegabiDefer = true
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// Not ready yet:
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//flags.RegabiArgs = true
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}
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// Check regabi dependencies.
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if flags.RegabiG && !flags.RegabiWrappers {
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panic("GOEXPERIMENT regabig requires regabiwrappers")
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@ -60,9 +60,10 @@ type Flags struct {
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StaticLockRanking bool
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// Regabi is split into several sub-experiments that can be
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// enabled individually. GOEXPERIMENT=regabi implies the
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// subset that are currently "working". Not all combinations work.
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Regabi bool
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// enabled individually. Not all combinations work.
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// The "regabi" GOEXPERIMENT is an alias for all "working"
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// subexperiments.
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// RegabiWrappers enables ABI wrappers for calling between
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// ABI0 and ABIInternal functions. Without this, the ABIs are
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// assumed to be identical so cross-ABI calls are direct.
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