diff options
Diffstat (limited to 'src/cmd/internal/obj/x86/obj6.go')
| -rw-r--r-- | src/cmd/internal/obj/x86/obj6.go | 239 |
1 files changed, 0 insertions, 239 deletions
diff --git a/src/cmd/internal/obj/x86/obj6.go b/src/cmd/internal/obj/x86/obj6.go index f1e2b2507d..ec73bb3327 100644 --- a/src/cmd/internal/obj/x86/obj6.go +++ b/src/cmd/internal/obj/x86/obj6.go @@ -34,7 +34,6 @@ import ( "cmd/internal/obj" "cmd/internal/sys" "fmt" - "log" "math" "strings" ) @@ -1183,241 +1182,6 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32, textarg int32) *ob return jls } -func follow(ctxt *obj.Link, s *obj.LSym) { - ctxt.Cursym = s - - firstp := ctxt.NewProg() - lastp := firstp - xfol(ctxt, s.Text, &lastp) - lastp.Link = nil - s.Text = firstp.Link -} - -func nofollow(a obj.As) bool { - switch a { - case obj.AJMP, - obj.ARET, - AIRETL, - AIRETQ, - AIRETW, - ARETFL, - ARETFQ, - ARETFW, - obj.AUNDEF: - return true - } - - return false -} - -func pushpop(a obj.As) bool { - switch a { - case APUSHL, - APUSHFL, - APUSHQ, - APUSHFQ, - APUSHW, - APUSHFW, - APOPL, - APOPFL, - APOPQ, - APOPFQ, - APOPW, - APOPFW: - return true - } - - return false -} - -func relinv(a obj.As) obj.As { - switch a { - case AJEQ: - return AJNE - case AJNE: - return AJEQ - case AJLE: - return AJGT - case AJLS: - return AJHI - case AJLT: - return AJGE - case AJMI: - return AJPL - case AJGE: - return AJLT - case AJPL: - return AJMI - case AJGT: - return AJLE - case AJHI: - return AJLS - case AJCS: - return AJCC - case AJCC: - return AJCS - case AJPS: - return AJPC - case AJPC: - return AJPS - case AJOS: - return AJOC - case AJOC: - return AJOS - } - - log.Fatalf("unknown relation: %s", a) - return 0 -} - -func xfol(ctxt *obj.Link, p *obj.Prog, last **obj.Prog) { - var q *obj.Prog - var i int - var a obj.As - -loop: - if p == nil { - return - } - if p.As == obj.AJMP { - q = p.Pcond - if q != nil && q.As != obj.ATEXT { - /* mark instruction as done and continue layout at target of jump */ - p.Mark |= DONE - - p = q - if p.Mark&DONE == 0 { - goto loop - } - } - } - - if p.Mark&DONE != 0 { - /* - * p goes here, but already used it elsewhere. - * copy up to 4 instructions or else branch to other copy. - */ - i = 0 - q = p - for ; i < 4; i, q = i+1, q.Link { - if q == nil { - break - } - if q == *last { - break - } - a = q.As - if a == obj.ANOP { - i-- - continue - } - - if nofollow(a) || pushpop(a) { - break // NOTE(rsc): arm does goto copy - } - if q.Pcond == nil || q.Pcond.Mark&DONE != 0 { - continue - } - if a == obj.ACALL || a == ALOOP { - continue - } - for { - if p.As == obj.ANOP { - p = p.Link - continue - } - - q = obj.Copyp(ctxt, p) - p = p.Link - q.Mark |= DONE - (*last).Link = q - *last = q - if q.As != a || q.Pcond == nil || q.Pcond.Mark&DONE != 0 { - continue - } - - q.As = relinv(q.As) - p = q.Pcond - q.Pcond = q.Link - q.Link = p - xfol(ctxt, q.Link, last) - p = q.Link - if p.Mark&DONE != 0 { - return - } - goto loop - /* */ - } - } - q = ctxt.NewProg() - q.As = obj.AJMP - q.Pos = p.Pos - q.To.Type = obj.TYPE_BRANCH - q.To.Offset = p.Pc - q.Pcond = p - p = q - } - - /* emit p */ - p.Mark |= DONE - - (*last).Link = p - *last = p - a = p.As - - /* continue loop with what comes after p */ - if nofollow(a) { - return - } - if p.Pcond != nil && a != obj.ACALL { - /* - * some kind of conditional branch. - * recurse to follow one path. - * continue loop on the other. - */ - q = obj.Brchain(ctxt, p.Pcond) - if q != nil { - p.Pcond = q - } - q = obj.Brchain(ctxt, p.Link) - if q != nil { - p.Link = q - } - if p.From.Type == obj.TYPE_CONST { - if p.From.Offset == 1 { - /* - * expect conditional jump to be taken. - * rewrite so that's the fall-through case. - */ - p.As = relinv(a) - - q = p.Link - p.Link = p.Pcond - p.Pcond = q - } - } else { - q = p.Link - if q.Mark&DONE != 0 { - if a != ALOOP { - p.As = relinv(a) - p.Link = p.Pcond - p.Pcond = q - } - } - } - - xfol(ctxt, p.Link, last) - if p.Pcond.Mark&DONE != 0 { - return - } - p = p.Pcond - goto loop - } - - p = p.Link - goto loop -} - var unaryDst = map[obj.As]bool{ ABSWAPL: true, ABSWAPQ: true, @@ -1472,7 +1236,6 @@ var Linkamd64 = obj.LinkArch{ Arch: sys.ArchAMD64, Preprocess: preprocess, Assemble: span6, - Follow: follow, Progedit: progedit, UnaryDst: unaryDst, } @@ -1481,7 +1244,6 @@ var Linkamd64p32 = obj.LinkArch{ Arch: sys.ArchAMD64P32, Preprocess: preprocess, Assemble: span6, - Follow: follow, Progedit: progedit, UnaryDst: unaryDst, } @@ -1490,7 +1252,6 @@ var Link386 = obj.LinkArch{ Arch: sys.Arch386, Preprocess: preprocess, Assemble: span6, - Follow: follow, Progedit: progedit, UnaryDst: unaryDst, } |