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cmd/internal/obj: consolidate emitting entry stack map

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The obj package needs to emit the PCDATA to select the entry stack map
before calling morestack. Currently this is copied for every
architecture. Since we're about to change how this works, consolidate
all of these copies into a single helper function.

For #24543.

Change-Id: Ia92d94de78f8e23fd06dba747c43e03e5989f67b
Reviewed-on: https://go-review.googlesource.com/109346
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Austin Clements 2018-04-21 21:13:56 -04:00
parent 837ed98d63
commit 02495da6b6
7 changed files with 23 additions and 28 deletions
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8
src/cmd/internal/obj/arm/obj5.go
View File

@ -768,13 +768,7 @@ func (c *ctxt5) stacksplit(p *obj.Prog, framesize int32) *obj.Prog {
spfix.As = obj.ANOP
spfix.Spadj = -framesize
pcdata := obj.Appendp(spfix, c.newprog)
pcdata.Pos = c.cursym.Func.Text.Pos
pcdata.As = obj.APCDATA
pcdata.From.Type = obj.TYPE_CONST
pcdata.From.Offset = objabi.PCDATA_StackMapIndex
pcdata.To.Type = obj.TYPE_CONST
pcdata.To.Offset = -1 // pcdata starts at -1 at function entry
pcdata := c.ctxt.EmitEntryLiveness(c.cursym, spfix, c.newprog)
// MOVW LR, R3
movw := obj.Appendp(pcdata, c.newprog)

8
src/cmd/internal/obj/arm64/obj7.go
View File

@ -167,13 +167,7 @@ func (c *ctxt7) stacksplit(p *obj.Prog, framesize int32) *obj.Prog {
spfix.As = obj.ANOP
spfix.Spadj = -framesize
pcdata := obj.Appendp(spfix, c.newprog)
pcdata.Pos = c.cursym.Func.Text.Pos
pcdata.As = obj.APCDATA
pcdata.From.Type = obj.TYPE_CONST
pcdata.From.Offset = objabi.PCDATA_StackMapIndex
pcdata.To.Type = obj.TYPE_CONST
pcdata.To.Offset = -1 // pcdata starts at -1 at function entry
pcdata := c.ctxt.EmitEntryLiveness(c.cursym, spfix, c.newprog)
// MOV LR, R3
movlr := obj.Appendp(pcdata, c.newprog)

2
src/cmd/internal/obj/mips/obj0.go
View File

@ -790,6 +790,8 @@ func (c *ctxt0) stacksplit(p *obj.Prog, framesize int32) *obj.Prog {
p.Mark |= LABEL
}
p = c.ctxt.EmitEntryLiveness(c.cursym, p, c.newprog)
// JAL runtime.morestack(SB)
p = obj.Appendp(p, c.newprog)

15
src/cmd/internal/obj/plist.go
View File

@ -190,3 +190,18 @@ func (ctxt *Link) Globl(s *LSym, size int64, flag int) {
s.Type = objabi.STLSBSS
}
}
// EmitEntryLiveness generates PCDATA Progs after p to switch to the
// liveness map active at the entry of function s. It returns the last
// Prog generated.
func (ctxt *Link) EmitEntryLiveness(s *LSym, p *Prog, newprog ProgAlloc) *Prog {
pcdata := Appendp(p, newprog)
pcdata.Pos = s.Func.Text.Pos
pcdata.As = APCDATA
pcdata.From.Type = TYPE_CONST
pcdata.From.Offset = objabi.PCDATA_StackMapIndex
pcdata.To.Type = TYPE_CONST
pcdata.To.Offset = -1 // pcdata starts at -1 at function entry
return pcdata
}

2
src/cmd/internal/obj/ppc64/obj9.go
View File

@ -966,6 +966,8 @@ func (c *ctxt9) stacksplit(p *obj.Prog, framesize int32) *obj.Prog {
q.Pcond = p
}
p = c.ctxt.EmitEntryLiveness(c.cursym, p, c.newprog)
var morestacksym *obj.LSym
if c.cursym.CFunc() {
morestacksym = c.ctxt.Lookup("runtime.morestackc")

8
src/cmd/internal/obj/s390x/objz.go
View File

@ -679,13 +679,7 @@ func (c *ctxtz) stacksplitPost(p *obj.Prog, pPre *obj.Prog, pPreempt *obj.Prog,
spfix.As = obj.ANOP
spfix.Spadj = -framesize
pcdata := obj.Appendp(spfix, c.newprog)
pcdata.Pos = c.cursym.Func.Text.Pos
pcdata.As = obj.APCDATA
pcdata.From.Type = obj.TYPE_CONST
pcdata.From.Offset = objabi.PCDATA_StackMapIndex
pcdata.To.Type = obj.TYPE_CONST
pcdata.To.Offset = -1 // pcdata starts at -1 at function entry
pcdata := c.ctxt.EmitEntryLiveness(c.cursym, spfix, c.newprog)
// MOVD LR, R5
p = obj.Appendp(pcdata, c.newprog)

8
src/cmd/internal/obj/x86/obj6.go
View File

@ -1150,13 +1150,7 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
spfix.As = obj.ANOP
spfix.Spadj = -framesize
pcdata := obj.Appendp(spfix, newprog)
pcdata.Pos = cursym.Func.Text.Pos
pcdata.As = obj.APCDATA
pcdata.From.Type = obj.TYPE_CONST
pcdata.From.Offset = objabi.PCDATA_StackMapIndex
pcdata.To.Type = obj.TYPE_CONST
pcdata.To.Offset = -1 // pcdata starts at -1 at function entry
pcdata := ctxt.EmitEntryLiveness(cursym, spfix, newprog)
call := obj.Appendp(pcdata, newprog)
call.Pos = cursym.Func.Text.Pos