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cmd/compile: remove OIOTA

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OIOTA used to be used to represent "iota" in the pre-typechecked IR,
before we knew whether it was safe to replace it with a constant
(because it could be redefined as a global symbol later).

However, now types2 handles constant folding, including handling of
"iota". So this can go away.

Updates #51691.

Change-Id: I3cec45b22c4c8f1c357dcc4003292c21ae32aa90
Reviewed-on: https://go-review.googlesource.com/c/go/+/393255
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This commit is contained in:
Matthew Dempsky 2022-03-15 22:49:12 -07:00
parent 1024503f84
commit d661bdeabf
8 changed files with 53 additions and 100 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/cmd/compile/internal/ir/func.go
View file

@ -50,7 +50,6 @@ import (
type Func struct {
miniNode
Body Nodes
Iota int64
Nname *Name // ONAME node
OClosure *ClosureExpr // OCLOSURE node
@ -140,7 +139,6 @@ func NewFunc(pos src.XPos) *Func {
f := new(Func)
f.pos = pos
f.op = ODCLFUNC
f.Iota = -1
// Most functions are ABIInternal. The importer or symabis
// pass may override this.
f.ABI = obj.ABIInternal

10
src/cmd/compile/internal/ir/name.go
View file

@ -166,14 +166,6 @@ func NewNameAt(pos src.XPos, sym *types.Sym) *Name {
return newNameAt(pos, ONAME, sym)
}
// NewIota returns a new OIOTA Node.
func NewIota(pos src.XPos, sym *types.Sym) *Name {
if sym == nil {
base.Fatalf("NewIota nil")
}
return newNameAt(pos, OIOTA, sym)
}
// NewDeclNameAt returns a new Name associated with symbol s at position pos.
// The caller is responsible for setting Curfn.
func NewDeclNameAt(pos src.XPos, op Op, sym *types.Sym) *Name {
@ -223,8 +215,6 @@ func (n *Name) SetOffset(x int64) {
}
func (n *Name) FrameOffset() int64 { return n.Offset_ }
func (n *Name) SetFrameOffset(x int64) { n.Offset_ = x }
func (n *Name) Iota() int64 { return n.Offset_ }
func (n *Name) SetIota(x int64) { n.Offset_ = x }
func (n *Name) Walkdef() uint8 { return n.bits.get2(miniWalkdefShift) }
func (n *Name) SetWalkdef(x uint8) {
if x > 3 {

1
src/cmd/compile/internal/ir/node.go
View file

@ -240,7 +240,6 @@ const (
ORECV // <-X
ORUNESTR // Type(X) (Type is string, X is rune)
OSELRECV2 // like OAS2: Lhs = Rhs where len(Lhs)=2, len(Rhs)=1, Rhs[0].Op = ORECV (appears as .Var of OCASE)
OIOTA // iota
OREAL // real(X)
OIMAG // imag(X)
OCOMPLEX // complex(X, Y)

105
src/cmd/compile/internal/ir/op_string.go
View file

@ -112,62 +112,61 @@ func _() {
_ = x[ORECV-101]
_ = x[ORUNESTR-102]
_ = x[OSELRECV2-103]
_ = x[OIOTA-104]
_ = x[OREAL-105]
_ = x[OIMAG-106]
_ = x[OCOMPLEX-107]
_ = x[OALIGNOF-108]
_ = x[OOFFSETOF-109]
_ = x[OSIZEOF-110]
_ = x[OUNSAFEADD-111]
_ = x[OUNSAFESLICE-112]
_ = x[OMETHEXPR-113]
_ = x[OMETHVALUE-114]
_ = x[OBLOCK-115]
_ = x[OBREAK-116]
_ = x[OCASE-117]
_ = x[OCONTINUE-118]
_ = x[ODEFER-119]
_ = x[OFALL-120]
_ = x[OFOR-121]
_ = x[OFORUNTIL-122]
_ = x[OGOTO-123]
_ = x[OIF-124]
_ = x[OLABEL-125]
_ = x[OGO-126]
_ = x[ORANGE-127]
_ = x[ORETURN-128]
_ = x[OSELECT-129]
_ = x[OSWITCH-130]
_ = x[OTYPESW-131]
_ = x[OFUNCINST-132]
_ = x[OTFUNC-133]
_ = x[OINLCALL-134]
_ = x[OEFACE-135]
_ = x[OITAB-136]
_ = x[OIDATA-137]
_ = x[OSPTR-138]
_ = x[OCFUNC-139]
_ = x[OCHECKNIL-140]
_ = x[OVARDEF-141]
_ = x[OVARKILL-142]
_ = x[OVARLIVE-143]
_ = x[ORESULT-144]
_ = x[OINLMARK-145]
_ = x[OLINKSYMOFFSET-146]
_ = x[ODYNAMICDOTTYPE-147]
_ = x[ODYNAMICDOTTYPE2-148]
_ = x[ODYNAMICTYPE-149]
_ = x[OTAILCALL-150]
_ = x[OGETG-151]
_ = x[OGETCALLERPC-152]
_ = x[OGETCALLERSP-153]
_ = x[OEND-154]
_ = x[OREAL-104]
_ = x[OIMAG-105]
_ = x[OCOMPLEX-106]
_ = x[OALIGNOF-107]
_ = x[OOFFSETOF-108]
_ = x[OSIZEOF-109]
_ = x[OUNSAFEADD-110]
_ = x[OUNSAFESLICE-111]
_ = x[OMETHEXPR-112]
_ = x[OMETHVALUE-113]
_ = x[OBLOCK-114]
_ = x[OBREAK-115]
_ = x[OCASE-116]
_ = x[OCONTINUE-117]
_ = x[ODEFER-118]
_ = x[OFALL-119]
_ = x[OFOR-120]
_ = x[OFORUNTIL-121]
_ = x[OGOTO-122]
_ = x[OIF-123]
_ = x[OLABEL-124]
_ = x[OGO-125]
_ = x[ORANGE-126]
_ = x[ORETURN-127]
_ = x[OSELECT-128]
_ = x[OSWITCH-129]
_ = x[OTYPESW-130]
_ = x[OFUNCINST-131]
_ = x[OTFUNC-132]
_ = x[OINLCALL-133]
_ = x[OEFACE-134]
_ = x[OITAB-135]
_ = x[OIDATA-136]
_ = x[OSPTR-137]
_ = x[OCFUNC-138]
_ = x[OCHECKNIL-139]
_ = x[OVARDEF-140]
_ = x[OVARKILL-141]
_ = x[OVARLIVE-142]
_ = x[ORESULT-143]
_ = x[OINLMARK-144]
_ = x[OLINKSYMOFFSET-145]
_ = x[ODYNAMICDOTTYPE-146]
_ = x[ODYNAMICDOTTYPE2-147]
_ = x[ODYNAMICTYPE-148]
_ = x[OTAILCALL-149]
_ = x[OGETG-150]
_ = x[OGETCALLERPC-151]
_ = x[OGETCALLERSP-152]
_ = x[OEND-153]
}
const _Op_name = "XXXNAMENONAMETYPELITERALNILADDSUBORXORADDSTRADDRANDANDAPPENDBYTES2STRBYTES2STRTMPRUNES2STRSTR2BYTESSTR2BYTESTMPSTR2RUNESSLICE2ARRPTRASAS2AS2DOTTYPEAS2FUNCAS2MAPRAS2RECVASOPCALLCALLFUNCCALLMETHCALLINTERCAPCLOSECLOSURECOMPLITMAPLITSTRUCTLITARRAYLITSLICELITPTRLITCONVCONVIFACECONVIDATACONVNOPCOPYDCLDCLFUNCDCLCONSTDCLTYPEDELETEDOTDOTPTRDOTMETHDOTINTERXDOTDOTTYPEDOTTYPE2EQNELTLEGEGTDEREFINDEXINDEXMAPKEYSTRUCTKEYLENMAKEMAKECHANMAKEMAPMAKESLICEMAKESLICECOPYMULDIVMODLSHRSHANDANDNOTNEWNOTBITNOTPLUSNEGORORPANICPRINTPRINTNPARENSENDSLICESLICEARRSLICESTRSLICE3SLICE3ARRSLICEHEADERRECOVERRECOVERFPRECVRUNESTRSELRECV2IOTAREALIMAGCOMPLEXALIGNOFOFFSETOFSIZEOFUNSAFEADDUNSAFESLICEMETHEXPRMETHVALUEBLOCKBREAKCASECONTINUEDEFERFALLFORFORUNTILGOTOIFLABELGORANGERETURNSELECTSWITCHTYPESWFUNCINSTTFUNCINLCALLEFACEITABIDATASPTRCFUNCCHECKNILVARDEFVARKILLVARLIVERESULTINLMARKLINKSYMOFFSETDYNAMICDOTTYPEDYNAMICDOTTYPE2DYNAMICTYPETAILCALLGETGGETCALLERPCGETCALLERSPEND"
const _Op_name = "XXXNAMENONAMETYPELITERALNILADDSUBORXORADDSTRADDRANDANDAPPENDBYTES2STRBYTES2STRTMPRUNES2STRSTR2BYTESSTR2BYTESTMPSTR2RUNESSLICE2ARRPTRASAS2AS2DOTTYPEAS2FUNCAS2MAPRAS2RECVASOPCALLCALLFUNCCALLMETHCALLINTERCAPCLOSECLOSURECOMPLITMAPLITSTRUCTLITARRAYLITSLICELITPTRLITCONVCONVIFACECONVIDATACONVNOPCOPYDCLDCLFUNCDCLCONSTDCLTYPEDELETEDOTDOTPTRDOTMETHDOTINTERXDOTDOTTYPEDOTTYPE2EQNELTLEGEGTDEREFINDEXINDEXMAPKEYSTRUCTKEYLENMAKEMAKECHANMAKEMAPMAKESLICEMAKESLICECOPYMULDIVMODLSHRSHANDANDNOTNEWNOTBITNOTPLUSNEGORORPANICPRINTPRINTNPARENSENDSLICESLICEARRSLICESTRSLICE3SLICE3ARRSLICEHEADERRECOVERRECOVERFPRECVRUNESTRSELRECV2REALIMAGCOMPLEXALIGNOFOFFSETOFSIZEOFUNSAFEADDUNSAFESLICEMETHEXPRMETHVALUEBLOCKBREAKCASECONTINUEDEFERFALLFORFORUNTILGOTOIFLABELGORANGERETURNSELECTSWITCHTYPESWFUNCINSTTFUNCINLCALLEFACEITABIDATASPTRCFUNCCHECKNILVARDEFVARKILLVARLIVERESULTINLMARKLINKSYMOFFSETDYNAMICDOTTYPEDYNAMICDOTTYPE2DYNAMICTYPETAILCALLGETGGETCALLERPCGETCALLERSPEND"
var _Op_index = [...]uint16{0, 3, 7, 13, 17, 24, 27, 30, 33, 35, 38, 44, 48, 54, 60, 69, 81, 90, 99, 111, 120, 132, 134, 137, 147, 154, 161, 168, 172, 176, 184, 192, 201, 204, 209, 216, 223, 229, 238, 246, 254, 260, 264, 273, 282, 289, 293, 296, 303, 311, 318, 324, 327, 333, 340, 348, 352, 359, 367, 369, 371, 373, 375, 377, 379, 384, 389, 397, 400, 409, 412, 416, 424, 431, 440, 453, 456, 459, 462, 465, 468, 471, 477, 480, 483, 489, 493, 496, 500, 505, 510, 516, 521, 525, 530, 538, 546, 552, 561, 572, 579, 588, 592, 599, 607, 611, 615, 619, 626, 633, 641, 647, 656, 667, 675, 684, 689, 694, 698, 706, 711, 715, 718, 726, 730, 732, 737, 739, 744, 750, 756, 762, 768, 776, 781, 788, 793, 797, 802, 806, 811, 819, 825, 832, 839, 845, 852, 865, 879, 894, 905, 913, 917, 928, 939, 942}
var _Op_index = [...]uint16{0, 3, 7, 13, 17, 24, 27, 30, 33, 35, 38, 44, 48, 54, 60, 69, 81, 90, 99, 111, 120, 132, 134, 137, 147, 154, 161, 168, 172, 176, 184, 192, 201, 204, 209, 216, 223, 229, 238, 246, 254, 260, 264, 273, 282, 289, 293, 296, 303, 311, 318, 324, 327, 333, 340, 348, 352, 359, 367, 369, 371, 373, 375, 377, 379, 384, 389, 397, 400, 409, 412, 416, 424, 431, 440, 453, 456, 459, 462, 465, 468, 471, 477, 480, 483, 489, 493, 496, 500, 505, 510, 516, 521, 525, 530, 538, 546, 552, 561, 572, 579, 588, 592, 599, 607, 611, 615, 622, 629, 637, 643, 652, 663, 671, 680, 685, 690, 694, 702, 707, 711, 714, 722, 726, 728, 733, 735, 740, 746, 752, 758, 764, 772, 777, 784, 789, 793, 798, 802, 807, 815, 821, 828, 835, 841, 848, 861, 875, 890, 901, 909, 913, 924, 935, 938}
func (i Op) String() string {
if i >= Op(len(_Op_index)-1) {

2
src/cmd/compile/internal/ir/sizeof_test.go
View file

@ -20,7 +20,7 @@ func TestSizeof(t *testing.T) {
_32bit uintptr // size on 32bit platforms
_64bit uintptr // size on 64bit platforms
}{
{Func{}, 192, 328},
{Func{}, 184, 320},
{Name{}, 108, 192},
}

6
src/cmd/compile/internal/typecheck/func.go
View file

@ -241,12 +241,6 @@ func tcClosure(clo *ir.ClosureExpr, top int) ir.Node {
base.FatalfAt(fn.Pos(), "underlying closure func already typechecked: %v", fn)
}
// Set current associated iota value, so iota can be used inside
// function in ConstSpec, see issue #22344
if x := getIotaValue(); x >= 0 {
fn.Iota = x
}
ir.NameClosure(clo, ir.CurFunc)
Func(fn)

23
src/cmd/compile/internal/typecheck/typecheck.go
View file

@ -153,13 +153,6 @@ func Resolve(n ir.Node) (res ir.Node) {
return n
}
if r.Op() == ir.OIOTA {
if x := getIotaValue(); x >= 0 {
return ir.NewInt(x)
}
return n
}
return r
}
@ -2152,22 +2145,6 @@ func CheckReturn(fn *ir.Func) {
}
}
// getIotaValue returns the current value for "iota",
// or -1 if not within a ConstSpec.
func getIotaValue() int64 {
if i := len(typecheckdefstack); i > 0 {
if x := typecheckdefstack[i-1]; x.Op() == ir.OLITERAL {
return x.Iota()
}
}
if ir.CurFunc != nil && ir.CurFunc.Iota >= 0 {
return ir.CurFunc.Iota
}
return -1
}
// curpkg returns the current package, based on Curfn.
func curpkg() *types.Pkg {
fn := ir.CurFunc

4
src/cmd/compile/internal/typecheck/universe.go
View file

@ -7,7 +7,6 @@ package typecheck
import (
"go/constant"
"cmd/compile/internal/base"
"cmd/compile/internal/ir"
"cmd/compile/internal/types"
"cmd/internal/src"
@ -108,9 +107,6 @@ func InitUniverse() {
nnil.(*ir.NilExpr).SetSym(s)
s.Def = nnil
s = types.BuiltinPkg.Lookup("iota")
s.Def = ir.NewIota(base.Pos, s)
// initialize okfor
for et := types.Kind(0); et < types.NTYPE; et++ {
if types.IsInt[et] || et == types.TIDEAL {