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[dev.regabi] cmd/compile: add NewBasic and cleanup universe
This CL introduces types.NewBasic, for creating the predeclared universal types, and reorganizes how the universe is initialized so that all predeclared types are uniformly constructed. There are now a bunch of Type fields that are no longer assigned outside of the package, so this CL also introduces some new accessor methods that a subsequent CL will mechanically introduce uses of. Change-Id: Ie7996c3d5f1ca46cd5bfe45ecc91ebfa6a7b6c7d Reviewed-on: https://go-review.googlesource.com/c/go/+/274435 Trust: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Matthew Dempsky
parent
f37aa5e4e2
commit
a17c5e2fce
@ -87,31 +87,80 @@ var unsafeFuncs = [...]struct {
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// initUniverse initializes the universe block.
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func initUniverse() {
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lexinit()
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typeinit()
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lexinit1()
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if Widthptr == 0 {
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base.Fatalf("typeinit before betypeinit")
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}
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// lexinit initializes known symbols and the basic types.
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func lexinit() {
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for _, s := range &basicTypes {
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etype := s.etype
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if int(etype) >= len(types.Types) {
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base.Fatalf("lexinit: %s bad etype", s.name)
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slicePtrOffset = 0
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sliceLenOffset = Rnd(slicePtrOffset+int64(Widthptr), int64(Widthptr))
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sliceCapOffset = Rnd(sliceLenOffset+int64(Widthptr), int64(Widthptr))
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sizeofSlice = Rnd(sliceCapOffset+int64(Widthptr), int64(Widthptr))
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// string is same as slice wo the cap
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sizeofString = Rnd(sliceLenOffset+int64(Widthptr), int64(Widthptr))
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for et := types.EType(0); et < types.NTYPE; et++ {
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simtype[et] = et
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}
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s2 := ir.BuiltinPkg.Lookup(s.name)
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t := types.Types[etype]
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if t == nil {
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t = types.New(etype)
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t.Sym = s2
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if etype != types.TANY && etype != types.TSTRING {
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types.Types[types.TANY] = types.New(types.TANY)
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types.Types[types.TINTER] = types.New(types.TINTER) // empty interface
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defBasic := func(kind types.EType, pkg *types.Pkg, name string) *types.Type {
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sym := pkg.Lookup(name)
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n := ir.NewNameAt(src.NoXPos, sym)
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n.SetOp(ir.OTYPE)
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t := types.NewBasic(kind, n)
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n.SetType(t)
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sym.Def = n
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if kind != types.TANY {
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dowidth(t)
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}
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types.Types[etype] = t
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return t
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}
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s2.Def = ir.TypeNode(t)
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for _, s := range &basicTypes {
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types.Types[s.etype] = defBasic(s.etype, ir.BuiltinPkg, s.name)
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}
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for _, s := range &typedefs {
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sameas := s.sameas32
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if Widthptr == 8 {
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sameas = s.sameas64
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}
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simtype[s.etype] = sameas
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types.Types[s.etype] = defBasic(s.etype, ir.BuiltinPkg, s.name)
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}
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// We create separate byte and rune types for better error messages
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// rather than just creating type alias *types.Sym's for the uint8 and
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// int32 types. Hence, (bytetype|runtype).Sym.isAlias() is false.
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// TODO(gri) Should we get rid of this special case (at the cost
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// of less informative error messages involving bytes and runes)?
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// (Alternatively, we could introduce an OTALIAS node representing
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// type aliases, albeit at the cost of having to deal with it everywhere).
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types.Bytetype = defBasic(types.TUINT8, ir.BuiltinPkg, "byte")
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types.Runetype = defBasic(types.TINT32, ir.BuiltinPkg, "rune")
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// error type
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s := ir.BuiltinPkg.Lookup("error")
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n := ir.NewNameAt(src.NoXPos, s)
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n.SetOp(ir.OTYPE)
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types.Errortype = types.NewNamed(n)
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types.Errortype.SetUnderlying(makeErrorInterface())
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n.SetType(types.Errortype)
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s.Def = n
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dowidth(types.Errortype)
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types.Types[types.TUNSAFEPTR] = defBasic(types.TUNSAFEPTR, unsafepkg, "Pointer")
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// simple aliases
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simtype[types.TMAP] = types.TPTR
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simtype[types.TCHAN] = types.TPTR
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simtype[types.TFUNC] = types.TPTR
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simtype[types.TUNSAFEPTR] = types.TPTR
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for _, s := range &builtinFuncs {
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s2 := ir.BuiltinPkg.Lookup(s.name)
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s2.Def = NewName(s2)
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@ -124,19 +173,13 @@ func lexinit() {
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ir.AsNode(s2.Def).SetSubOp(s.op)
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}
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types.UntypedString = types.New(types.TSTRING)
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types.UntypedBool = types.New(types.TBOOL)
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types.Types[types.TANY] = types.New(types.TANY)
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s := ir.BuiltinPkg.Lookup("true")
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s = ir.BuiltinPkg.Lookup("true")
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s.Def = nodbool(true)
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ir.AsNode(s.Def).SetSym(lookup("true"))
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ir.AsNode(s.Def).SetType(types.UntypedBool)
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s = ir.BuiltinPkg.Lookup("false")
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s.Def = nodbool(false)
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ir.AsNode(s.Def).SetSym(lookup("false"))
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ir.AsNode(s.Def).SetType(types.UntypedBool)
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s = lookup("_")
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s.Block = -100
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@ -160,28 +203,6 @@ func lexinit() {
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s = ir.BuiltinPkg.Lookup("iota")
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s.Def = ir.Nod(ir.OIOTA, nil, nil)
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ir.AsNode(s.Def).SetSym(s)
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}
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func typeinit() {
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if Widthptr == 0 {
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base.Fatalf("typeinit before betypeinit")
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}
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for et := types.EType(0); et < types.NTYPE; et++ {
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simtype[et] = et
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}
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types.Types[types.TPTR] = types.New(types.TPTR)
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dowidth(types.Types[types.TPTR])
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t := types.New(types.TUNSAFEPTR)
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types.Types[types.TUNSAFEPTR] = t
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t.Sym = unsafepkg.Lookup("Pointer")
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n := ir.NewNameAt(src.NoXPos, t.Sym) // NewNameAt to get a package for use tracking
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n.SetOp(ir.OTYPE)
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n.SetType(t)
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t.Sym.Def = n
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dowidth(types.Types[types.TUNSAFEPTR])
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for et := types.TINT8; et <= types.TUINT64; et++ {
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isInt[et] = true
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@ -259,8 +280,7 @@ func typeinit() {
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okforcmp[types.TSTRING] = true
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var i int
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for i = 0; i < len(okfor); i++ {
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for i := range okfor {
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okfor[i] = okfornone[:]
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}
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@ -302,25 +322,6 @@ func typeinit() {
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iscmp[ir.OLE] = true
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iscmp[ir.OEQ] = true
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iscmp[ir.ONE] = true
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types.Types[types.TINTER] = types.New(types.TINTER) // empty interface
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// simple aliases
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simtype[types.TMAP] = types.TPTR
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simtype[types.TCHAN] = types.TPTR
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simtype[types.TFUNC] = types.TPTR
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simtype[types.TUNSAFEPTR] = types.TPTR
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slicePtrOffset = 0
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sliceLenOffset = Rnd(slicePtrOffset+int64(Widthptr), int64(Widthptr))
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sliceCapOffset = Rnd(sliceLenOffset+int64(Widthptr), int64(Widthptr))
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sizeofSlice = Rnd(sliceCapOffset+int64(Widthptr), int64(Widthptr))
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// string is same as slice wo the cap
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sizeofString = Rnd(sliceLenOffset+int64(Widthptr), int64(Widthptr))
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dowidth(types.Types[types.TSTRING])
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dowidth(types.UntypedString)
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}
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func makeErrorInterface() *types.Type {
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@ -335,59 +336,6 @@ func makeErrorInterface() *types.Type {
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return t
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}
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func lexinit1() {
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// error type
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n := ir.NewNameAt(src.NoXPos, ir.BuiltinPkg.Lookup("error"))
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types.Errortype = types.NewNamed(n)
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types.Errortype.SetUnderlying(makeErrorInterface())
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n.SetOp(ir.OTYPE)
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n.SetType(types.Errortype)
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n.Sym().Def = n
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dowidth(types.Errortype)
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// We create separate byte and rune types for better error messages
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// rather than just creating type alias *types.Sym's for the uint8 and
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// int32 types. Hence, (bytetype|runtype).Sym.isAlias() is false.
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// TODO(gri) Should we get rid of this special case (at the cost
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// of less informative error messages involving bytes and runes)?
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// (Alternatively, we could introduce an OTALIAS node representing
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// type aliases, albeit at the cost of having to deal with it everywhere).
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// byte alias
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s := ir.BuiltinPkg.Lookup("byte")
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types.Bytetype = types.New(types.TUINT8)
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types.Bytetype.Sym = s
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s.Def = ir.TypeNode(types.Bytetype)
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dowidth(types.Bytetype)
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// rune alias
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s = ir.BuiltinPkg.Lookup("rune")
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types.Runetype = types.New(types.TINT32)
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types.Runetype.Sym = s
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s.Def = ir.TypeNode(types.Runetype)
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dowidth(types.Runetype)
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// backend-dependent builtin types (e.g. int).
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for _, s := range &typedefs {
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s1 := ir.BuiltinPkg.Lookup(s.name)
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sameas := s.sameas32
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if Widthptr == 8 {
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sameas = s.sameas64
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}
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simtype[s.etype] = sameas
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t := types.New(s.etype)
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t.Sym = s1
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types.Types[s.etype] = t
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s1.Def = ir.TypeNode(t)
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s1.Origpkg = ir.BuiltinPkg
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dowidth(t)
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}
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}
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// finishUniverse makes the universe block visible within the current package.
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func finishUniverse() {
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// Operationally, this is similar to a dot import of builtinpkg, except
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@ -110,8 +110,8 @@ var (
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Errortype *Type
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// Types to represent untyped string and boolean constants.
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UntypedString *Type
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UntypedBool *Type
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UntypedString = New(TSTRING)
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UntypedBool = New(TBOOL)
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// Types to represent untyped numeric constants.
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UntypedInt = New(TIDEAL)
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@ -184,6 +184,15 @@ func (t *Type) SetNoalg(b bool) { t.flags.set(typeNoalg, b) }
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func (t *Type) SetDeferwidth(b bool) { t.flags.set(typeDeferwidth, b) }
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func (t *Type) SetRecur(b bool) { t.flags.set(typeRecur, b) }
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// Kind returns the kind of type t.
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func (t *Type) Kind() EType { return t.Etype }
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// Sym returns the name of type t.
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func (t *Type) GetSym() *Sym { return t.Sym }
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// Underlying returns the underlying type of type t.
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func (t *Type) Underlying() *Type { return t.Orig }
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// SetNod associates t with syntax node n.
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func (t *Type) SetNod(n IRNode) {
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// t.nod can be non-nil already
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@ -1601,3 +1610,11 @@ func (t *Type) SetUnderlying(underlying *Type) {
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}
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}
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}
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// NewNamed returns a new basic type of the given kind.
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func NewBasic(kind EType, obj IRNode) *Type {
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t := New(kind)
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t.Sym = obj.Sym()
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t.nod = obj
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return t
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}
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