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cmd/internal/obj: clean up checkaddr

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Coalesce identical cases.
Give it a proper doc comment.
Fix comment locations.
Update/delete old comments.

Passes toolstash-check -all.

Change-Id: I88d9cf20e6e04b0c1c6583e92cd96335831f183f
Reviewed-on: https://go-review.googlesource.com/38442
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Josh Bleecher Snyder 2017-03-21 21:51:10 -07:00
parent 3394633db0
commit 33266df861
1 changed files with 9 additions and 29 deletions
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38
src/cmd/internal/obj/pass.go
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@ -49,31 +49,23 @@ func brloop(ctxt *Link, p *Prog) *Prog {
return q
}
// checkaddr checks that a has an expected encoding, especially TYPE_CONST vs TYPE_ADDR.
func checkaddr(ctxt *Link, p *Prog, a *Addr) {
// Check expected encoding, especially TYPE_CONST vs TYPE_ADDR.
switch a.Type {
case TYPE_NONE:
case TYPE_NONE, TYPE_REGREG2, TYPE_REGLIST:
return
case TYPE_BRANCH:
case TYPE_BRANCH, TYPE_TEXTSIZE:
if a.Reg != 0 || a.Index != 0 || a.Scale != 0 || a.Name != 0 {
break
}
return
case TYPE_TEXTSIZE:
if a.Reg != 0 || a.Index != 0 || a.Scale != 0 || a.Name != 0 {
break
}
return
//if(a->u.bits != 0)
// break;
case TYPE_MEM:
return
// TODO(rsc): After fixing SHRQ, check a->index != 0 too.
case TYPE_CONST:
// TODO(rsc): After fixing SHRQ, check a.Index != 0 too.
if a.Name != 0 || a.Sym != nil || a.Reg != 0 {
ctxt.Diag("argument is TYPE_CONST, should be TYPE_ADDR, in %v", p)
return
@ -90,9 +82,9 @@ func checkaddr(ctxt *Link, p *Prog, a *Addr) {
}
return
// TODO(rsc): After fixing PINSRQ, check a->offset != 0 too.
// TODO(rsc): After fixing SHRQ, check a->index != 0 too.
case TYPE_REG:
// TODO(rsc): After fixing PINSRQ, check a.Offset != 0 too.
// TODO(rsc): After fixing SHRQ, check a.Index != 0 too.
if a.Scale != 0 || a.Name != 0 || a.Sym != nil {
break
}
@ -107,27 +99,15 @@ func checkaddr(ctxt *Link, p *Prog, a *Addr) {
}
return
case TYPE_SHIFT:
case TYPE_SHIFT, TYPE_REGREG:
if a.Index != 0 || a.Scale != 0 || a.Name != 0 || a.Sym != nil || a.Val != nil {
break
}
return
case TYPE_REGREG:
if a.Index != 0 || a.Scale != 0 || a.Name != 0 || a.Sym != nil || a.Val != nil {
break
}
return
case TYPE_REGREG2:
return
case TYPE_REGLIST:
return
// Expect sym and name to be set, nothing else.
// Technically more is allowed, but this is only used for *name(SB).
case TYPE_INDIR:
// Expect sym and name to be set, nothing else.
// Technically more is allowed, but this is only used for *name(SB).
if a.Reg != 0 || a.Index != 0 || a.Scale != 0 || a.Name == 0 || a.Offset != 0 || a.Sym == nil || a.Val != nil {
break
}