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Code Editor : universe.go
// Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // TODO(gri) This file should probably become part of package types. package gc import "cmd/compile/internal/types" // builtinpkg is a fake package that declares the universe block. var builtinpkg *types.Pkg var basicTypes = [...]struct { name string etype types.EType }{ {"int8", TINT8}, {"int16", TINT16}, {"int32", TINT32}, {"int64", TINT64}, {"uint8", TUINT8}, {"uint16", TUINT16}, {"uint32", TUINT32}, {"uint64", TUINT64}, {"float32", TFLOAT32}, {"float64", TFLOAT64}, {"complex64", TCOMPLEX64}, {"complex128", TCOMPLEX128}, {"bool", TBOOL}, {"string", TSTRING}, } var typedefs = [...]struct { name string etype types.EType sameas32 types.EType sameas64 types.EType }{ {"int", TINT, TINT32, TINT64}, {"uint", TUINT, TUINT32, TUINT64}, {"uintptr", TUINTPTR, TUINT32, TUINT64}, } var builtinFuncs = [...]struct { name string op Op }{ {"append", OAPPEND}, {"cap", OCAP}, {"close", OCLOSE}, {"complex", OCOMPLEX}, {"copy", OCOPY}, {"delete", ODELETE}, {"imag", OIMAG}, {"len", OLEN}, {"make", OMAKE}, {"new", ONEW}, {"panic", OPANIC}, {"print", OPRINT}, {"println", OPRINTN}, {"real", OREAL}, {"recover", ORECOVER}, } // isBuiltinFuncName reports whether name matches a builtin function // name. func isBuiltinFuncName(name string) bool { for _, fn := range builtinFuncs { if fn.name == name { return true } } return false } var unsafeFuncs = [...]struct { name string op Op }{ {"Alignof", OALIGNOF}, {"Offsetof", OOFFSETOF}, {"Sizeof", OSIZEOF}, } // initUniverse initializes the universe block. func initUniverse() { lexinit() typeinit() lexinit1() } // lexinit initializes known symbols and the basic types. func lexinit() { for _, s := range basicTypes { etype := s.etype if int(etype) >= len(types.Types) { Fatalf("lexinit: %s bad etype", s.name) } s2 := builtinpkg.Lookup(s.name) t := types.Types[etype] if t == nil { t = types.New(etype) t.Sym = s2 if etype != TANY && etype != TSTRING { dowidth(t) } types.Types[etype] = t } s2.Def = asTypesNode(typenod(t)) asNode(s2.Def).Name = new(Name) } for _, s := range builtinFuncs { s2 := builtinpkg.Lookup(s.name) s2.Def = asTypesNode(newname(s2)) asNode(s2.Def).SetSubOp(s.op) } for _, s := range unsafeFuncs { s2 := unsafepkg.Lookup(s.name) s2.Def = asTypesNode(newname(s2)) asNode(s2.Def).SetSubOp(s.op) } types.Idealstring = types.New(TSTRING) types.Idealbool = types.New(TBOOL) types.Types[TANY] = types.New(TANY) s := builtinpkg.Lookup("true") s.Def = asTypesNode(nodbool(true)) asNode(s.Def).Sym = lookup("true") asNode(s.Def).Name = new(Name) asNode(s.Def).Type = types.Idealbool s = builtinpkg.Lookup("false") s.Def = asTypesNode(nodbool(false)) asNode(s.Def).Sym = lookup("false") asNode(s.Def).Name = new(Name) asNode(s.Def).Type = types.Idealbool s = lookup("_") s.Block = -100 s.Def = asTypesNode(newname(s)) types.Types[TBLANK] = types.New(TBLANK) asNode(s.Def).Type = types.Types[TBLANK] nblank = asNode(s.Def) s = builtinpkg.Lookup("_") s.Block = -100 s.Def = asTypesNode(newname(s)) types.Types[TBLANK] = types.New(TBLANK) asNode(s.Def).Type = types.Types[TBLANK] types.Types[TNIL] = types.New(TNIL) s = builtinpkg.Lookup("nil") var v Val v.U = new(NilVal) s.Def = asTypesNode(nodlit(v)) asNode(s.Def).Sym = s asNode(s.Def).Name = new(Name) s = builtinpkg.Lookup("iota") s.Def = asTypesNode(nod(OIOTA, nil, nil)) asNode(s.Def).Sym = s asNode(s.Def).Name = new(Name) } func typeinit() { if Widthptr == 0 { Fatalf("typeinit before betypeinit") } for et := types.EType(0); et < NTYPE; et++ { simtype[et] = et } types.Types[TPTR] = types.New(TPTR) dowidth(types.Types[TPTR]) t := types.New(TUNSAFEPTR) types.Types[TUNSAFEPTR] = t t.Sym = unsafepkg.Lookup("Pointer") t.Sym.Def = asTypesNode(typenod(t)) asNode(t.Sym.Def).Name = new(Name) dowidth(types.Types[TUNSAFEPTR]) for et := TINT8; et <= TUINT64; et++ { isInt[et] = true } isInt[TINT] = true isInt[TUINT] = true isInt[TUINTPTR] = true isFloat[TFLOAT32] = true isFloat[TFLOAT64] = true isComplex[TCOMPLEX64] = true isComplex[TCOMPLEX128] = true // initialize okfor for et := types.EType(0); et < NTYPE; et++ { if isInt[et] || et == TIDEAL { okforeq[et] = true okforcmp[et] = true okforarith[et] = true okforadd[et] = true okforand[et] = true okforconst[et] = true issimple[et] = true minintval[et] = new(Mpint) maxintval[et] = new(Mpint) } if isFloat[et] { okforeq[et] = true okforcmp[et] = true okforadd[et] = true okforarith[et] = true okforconst[et] = true issimple[et] = true minfltval[et] = newMpflt() maxfltval[et] = newMpflt() } if isComplex[et] { okforeq[et] = true okforadd[et] = true okforarith[et] = true okforconst[et] = true issimple[et] = true } } issimple[TBOOL] = true okforadd[TSTRING] = true okforbool[TBOOL] = true okforcap[TARRAY] = true okforcap[TCHAN] = true okforcap[TSLICE] = true okforconst[TBOOL] = true okforconst[TSTRING] = true okforlen[TARRAY] = true okforlen[TCHAN] = true okforlen[TMAP] = true okforlen[TSLICE] = true okforlen[TSTRING] = true okforeq[TPTR] = true okforeq[TUNSAFEPTR] = true okforeq[TINTER] = true okforeq[TCHAN] = true okforeq[TSTRING] = true okforeq[TBOOL] = true okforeq[TMAP] = true // nil only; refined in typecheck okforeq[TFUNC] = true // nil only; refined in typecheck okforeq[TSLICE] = true // nil only; refined in typecheck okforeq[TARRAY] = true // only if element type is comparable; refined in typecheck okforeq[TSTRUCT] = true // only if all struct fields are comparable; refined in typecheck okforcmp[TSTRING] = true var i int for i = 0; i < len(okfor); i++ { okfor[i] = okfornone[:] } // binary okfor[OADD] = okforadd[:] okfor[OAND] = okforand[:] okfor[OANDAND] = okforbool[:] okfor[OANDNOT] = okforand[:] okfor[ODIV] = okforarith[:] okfor[OEQ] = okforeq[:] okfor[OGE] = okforcmp[:] okfor[OGT] = okforcmp[:] okfor[OLE] = okforcmp[:] okfor[OLT] = okforcmp[:] okfor[OMOD] = okforand[:] okfor[OMUL] = okforarith[:] okfor[ONE] = okforeq[:] okfor[OOR] = okforand[:] okfor[OOROR] = okforbool[:] okfor[OSUB] = okforarith[:] okfor[OXOR] = okforand[:] okfor[OLSH] = okforand[:] okfor[ORSH] = okforand[:] // unary okfor[OBITNOT] = okforand[:] okfor[ONEG] = okforarith[:] okfor[ONOT] = okforbool[:] okfor[OPLUS] = okforarith[:] // special okfor[OCAP] = okforcap[:] okfor[OLEN] = okforlen[:] // comparison iscmp[OLT] = true iscmp[OGT] = true iscmp[OGE] = true iscmp[OLE] = true iscmp[OEQ] = true iscmp[ONE] = true maxintval[TINT8].SetString("0x7f") minintval[TINT8].SetString("-0x80") maxintval[TINT16].SetString("0x7fff") minintval[TINT16].SetString("-0x8000") maxintval[TINT32].SetString("0x7fffffff") minintval[TINT32].SetString("-0x80000000") maxintval[TINT64].SetString("0x7fffffffffffffff") minintval[TINT64].SetString("-0x8000000000000000") maxintval[TUINT8].SetString("0xff") maxintval[TUINT16].SetString("0xffff") maxintval[TUINT32].SetString("0xffffffff") maxintval[TUINT64].SetString("0xffffffffffffffff") // f is valid float if min < f < max. (min and max are not themselves valid.) maxfltval[TFLOAT32].SetString("33554431p103") // 2^24-1 p (127-23) + 1/2 ulp minfltval[TFLOAT32].SetString("-33554431p103") maxfltval[TFLOAT64].SetString("18014398509481983p970") // 2^53-1 p (1023-52) + 1/2 ulp minfltval[TFLOAT64].SetString("-18014398509481983p970") maxfltval[TCOMPLEX64] = maxfltval[TFLOAT32] minfltval[TCOMPLEX64] = minfltval[TFLOAT32] maxfltval[TCOMPLEX128] = maxfltval[TFLOAT64] minfltval[TCOMPLEX128] = minfltval[TFLOAT64] types.Types[TINTER] = types.New(TINTER) // empty interface // simple aliases simtype[TMAP] = TPTR simtype[TCHAN] = TPTR simtype[TFUNC] = TPTR simtype[TUNSAFEPTR] = TPTR slice_array = int(Rnd(0, int64(Widthptr))) slice_nel = int(Rnd(int64(slice_array)+int64(Widthptr), int64(Widthptr))) slice_cap = int(Rnd(int64(slice_nel)+int64(Widthptr), int64(Widthptr))) sizeof_Slice = int(Rnd(int64(slice_cap)+int64(Widthptr), int64(Widthptr))) // string is same as slice wo the cap sizeof_String = int(Rnd(int64(slice_nel)+int64(Widthptr), int64(Widthptr))) dowidth(types.Types[TSTRING]) dowidth(types.Idealstring) } func makeErrorInterface() *types.Type { field := types.NewField() field.Type = types.Types[TSTRING] f := functypefield(fakeRecvField(), nil, []*types.Field{field}) field = types.NewField() field.Sym = lookup("Error") field.Type = f t := types.New(TINTER) t.SetInterface([]*types.Field{field}) return t } func lexinit1() { // error type s := builtinpkg.Lookup("error") types.Errortype = makeErrorInterface() types.Errortype.Sym = s types.Errortype.Orig = makeErrorInterface() s.Def = asTypesNode(typenod(types.Errortype)) dowidth(types.Errortype) // We create separate byte and rune types for better error messages // rather than just creating type alias *types.Sym's for the uint8 and // int32 types. Hence, (bytetype|runtype).Sym.isAlias() is false. // TODO(gri) Should we get rid of this special case (at the cost // of less informative error messages involving bytes and runes)? // (Alternatively, we could introduce an OTALIAS node representing // type aliases, albeit at the cost of having to deal with it everywhere). // byte alias s = builtinpkg.Lookup("byte") types.Bytetype = types.New(TUINT8) types.Bytetype.Sym = s s.Def = asTypesNode(typenod(types.Bytetype)) asNode(s.Def).Name = new(Name) dowidth(types.Bytetype) // rune alias s = builtinpkg.Lookup("rune") types.Runetype = types.New(TINT32) types.Runetype.Sym = s s.Def = asTypesNode(typenod(types.Runetype)) asNode(s.Def).Name = new(Name) dowidth(types.Runetype) // backend-dependent builtin types (e.g. int). for _, s := range typedefs { s1 := builtinpkg.Lookup(s.name) sameas := s.sameas32 if Widthptr == 8 { sameas = s.sameas64 } simtype[s.etype] = sameas minfltval[s.etype] = minfltval[sameas] maxfltval[s.etype] = maxfltval[sameas] minintval[s.etype] = minintval[sameas] maxintval[s.etype] = maxintval[sameas] t := types.New(s.etype) t.Sym = s1 types.Types[s.etype] = t s1.Def = asTypesNode(typenod(t)) asNode(s1.Def).Name = new(Name) s1.Origpkg = builtinpkg dowidth(t) } } // finishUniverse makes the universe block visible within the current package. func finishUniverse() { // Operationally, this is similar to a dot import of builtinpkg, except // that we silently skip symbols that are already declared in the // package block rather than emitting a redeclared symbol error. for _, s := range builtinpkg.Syms { if s.Def == nil { continue } s1 := lookup(s.Name) if s1.Def != nil { continue } s1.Def = s.Def s1.Block = s.Block } nodfp = newname(lookup(".fp")) nodfp.Type = types.Types[TINT32] nodfp.SetClass(PPARAM) nodfp.Name.SetUsed(true) }
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