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cmd/compile: add a debug flag to enable/disable open-coded defers

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For debugging.

Change-Id: I831947376569cd2285b713ad304329951adf60ab
Reviewed-on: https://go-review.googlesource.com/c/go/+/307230
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Cherry Zhang 2021-04-02 21:48:00 -04:00
parent dcf85b30ba
commit e617b2b0dd
2 changed files with 3 additions and 0 deletions
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1
src/cmd/compile/internal/base/debug.go
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@ -39,6 +39,7 @@ type DebugFlags struct {
Libfuzzer int `help:"enable coverage instrumentation for libfuzzer"`
LocationLists int `help:"print information about DWARF location list creation"`
Nil int `help:"print information about nil checks"`
NoOpenDefer int `help:"disable open-coded defers"`
PCTab string `help:"print named pc-value table"`
Panic int `help:"show all compiler panics"`
Slice int `help:"print information about slice compilation"`

2
src/cmd/compile/internal/ssagen/ssa.go
View File

@ -470,6 +470,8 @@ func buildssa(fn *ir.Func, worker int) *ssa.Func {
s.hasOpenDefers = base.Flag.N == 0 && s.hasdefer && !s.curfn.OpenCodedDeferDisallowed()
switch {
case base.Debug.NoOpenDefer != 0:
s.hasOpenDefers = false
case s.hasOpenDefers && (base.Ctxt.Flag_shared || base.Ctxt.Flag_dynlink) && base.Ctxt.Arch.Name == "386":
// Don't support open-coded defers for 386 ONLY when using shared
// libraries, because there is extra code (added by rewriteToUseGot())