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cmd/compile: disable open-coded defers on riscv64

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Open-coded defers are currently broken on riscv64 - disable them for the
time being. All of the standard package tests now pass on linux/riscv64.

Updates issue #27532 and #36786

Change-Id: I20fc25ce91dfad48be32409ba5c64ca9a6acef1d
Reviewed-on: https://go-review.googlesource.com/c/go/+/216517
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Joel Sing 2020-01-27 09:32:52 +11:00
parent d8e052667f
commit a858d15f11
2 changed files with 10 additions and 1 deletions
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7
src/cmd/compile/internal/gc/ssa.go
View file

@ -340,12 +340,17 @@ func buildssa(fn *Node, worker int) *ssa.Func {
s.startmem = s.entryNewValue0(ssa.OpInitMem, types.TypeMem)
s.hasOpenDefers = Debug['N'] == 0 && s.hasdefer && !s.curfn.Func.OpenCodedDeferDisallowed()
if s.hasOpenDefers && (Ctxt.Flag_shared || Ctxt.Flag_dynlink) && thearch.LinkArch.Name == "386" {
switch {
case s.hasOpenDefers && (Ctxt.Flag_shared || Ctxt.Flag_dynlink) && thearch.LinkArch.Name == "386":
// Don't support open-coded defers for 386 ONLY when using shared
// libraries, because there is extra code (added by rewriteToUseGot())
// preceding the deferreturn/ret code that is generated by gencallret()
// that we don't track correctly.
s.hasOpenDefers = false
case thearch.LinkArch.Name == "riscv64":
// The use of open-coded defers is currently broken on riscv64,
// hence disable it for now - see issue golang.org/issue/36786
s.hasOpenDefers = false
}
if s.hasOpenDefers && s.curfn.Func.Exit.Len() > 0 {
// Skip doing open defers if there is any extra exit code (likely

4
test/defererrcheck.go
View file

@ -1,4 +1,5 @@
// errorcheck -0 -l -d=defer
// +build !riscv64
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
@ -6,6 +7,9 @@
// check that open-coded defers are used in expected situations
// TODO(jsing): Re-enable on riscv64 once open-coded defers are turned
// back on - see golang.org/issue/36786
package main
import "fmt"