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cmd/internal/obj: delete Debugzerostack dead code

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Fixes #11060

Change-Id: I4c6647fc2f103015b67e30dc2cdb6f771526c139
Reviewed-on: https://go-review.googlesource.com/13840
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-08-22 20:31:55 -07:00
parent c049d34006
commit 397b4f6cbf
3 changed files with 0 additions and 105 deletions
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59
src/cmd/internal/obj/arm/obj5.go
View File

@ -186,65 +186,6 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
cursym.Locals = autoffset
cursym.Args = p.To.Val.(int32)
if ctxt.Debugzerostack != 0 {
if autoffset != 0 && p.From3.Offset&obj.NOSPLIT == 0 {
// MOVW $4(R13), R1
p = obj.Appendp(ctxt, p)
p.As = AMOVW
p.From.Type = obj.TYPE_ADDR
p.From.Reg = REG_R13
p.From.Offset = 4
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_R1
// MOVW $n(R13), R2
p = obj.Appendp(ctxt, p)
p.As = AMOVW
p.From.Type = obj.TYPE_ADDR
p.From.Reg = REG_R13
p.From.Offset = 4 + int64(autoffset)
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_R2
// MOVW $0, R3
p = obj.Appendp(ctxt, p)
p.As = AMOVW
p.From.Type = obj.TYPE_CONST
p.From.Offset = 0
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_R3
// L:
// MOVW.nil R3, 0(R1) +4
// CMP R1, R2
// BNE L
pl := obj.Appendp(ctxt, p)
p := pl
p.As = AMOVW
p.From.Type = obj.TYPE_REG
p.From.Reg = REG_R3
p.To.Type = obj.TYPE_MEM
p.To.Reg = REG_R1
p.To.Offset = 4
p.Scond |= C_PBIT
p = obj.Appendp(ctxt, p)
p.As = ACMP
p.From.Type = obj.TYPE_REG
p.From.Reg = REG_R1
p.Reg = REG_R2
p = obj.Appendp(ctxt, p)
p.As = ABNE
p.To.Type = obj.TYPE_BRANCH
p.Pcond = pl
}
}
/*
* find leaf subroutines
* strip NOPs

1
src/cmd/internal/obj/link.go
View File

@ -466,7 +466,6 @@ type Link struct {
Arch *LinkArch
Debugasm int32
Debugvlog int32
Debugzerostack int32
Debugdivmod int32
Debugpcln int32
Flag_shared int32

45
src/cmd/internal/obj/x86/obj6.go
View File

@ -657,51 +657,6 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
p2.Pcond = p
}
if ctxt.Debugzerostack != 0 && autoffset != 0 && cursym.Text.From3.Offset&obj.NOSPLIT == 0 {
// 6l -Z means zero the stack frame on entry.
// This slows down function calls but can help avoid
// false positives in garbage collection.
p = obj.Appendp(ctxt, p)
p.As = AMOVQ
p.From.Type = obj.TYPE_REG
p.From.Reg = REG_SP
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_DI
if p.Mode == 32 {
p.As = AMOVL
}
p = obj.Appendp(ctxt, p)
p.As = AMOVQ
p.From.Type = obj.TYPE_CONST
p.From.Offset = int64(autoffset) / int64(ctxt.Arch.Regsize)
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_CX
if p.Mode == 32 {
p.As = AMOVL
}
p = obj.Appendp(ctxt, p)
p.As = AMOVQ
p.From.Type = obj.TYPE_CONST
p.From.Offset = 0
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_AX
if p.Mode == 32 {
p.As = AMOVL
}
p = obj.Appendp(ctxt, p)
p.As = AREP
p = obj.Appendp(ctxt, p)
p.As = ASTOSQ
if p.Mode == 32 {
p.As = ASTOSL
}
}
var a int
var pcsize int
for ; p != nil; p = p.Link {