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Commit 071e43a9 authored by Matthew Dempsky's avatar Matthew Dempsky
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cmd/compile: stop representing keywords as Syms 

Instead add a dedicated keywords map for use in lexer.ident and drop
Sym's Lexical field.

Change-Id: Ia668e65499035ff7167fabbbd0cd027102b21231
Reviewed-on: https://go-review.googlesource.com/19935Reviewed-by: 's avatarRobert Griesemer <gri@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
parent af558acc
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Showing with 98 additions and 104 deletions
src/cmd/compile/internal/gc/go.go
View file @ 071e43a9
......@@ -122,10 +122,9 @@ type Pkg struct {
}
type Sym struct {
Lexical uint16
Flags uint8
Link *Sym
Uniqgen uint32
Link *Sym
Importdef *Pkg // where imported definition was found
Linkname string // link name
......
src/cmd/compile/internal/gc/lex.go
View file @ 071e43a9
......@@ -1265,16 +1265,64 @@ func (l *lexer) ident(c rune) {
cp = nil
l.ungetr(c)
s := LookupBytes(lexbuf.Bytes())
name := lexbuf.Bytes()
if len(name) >= 2 {
if tok, ok := keywords[string(name)]; ok {
if Debug['x'] != 0 {
fmt.Printf("lex: %s %s\n", s, lexname(rune(s.Lexical)))
fmt.Printf("lex: %s\n", lexname(tok))
}
l.sym_ = s
switch s.Lexical {
case LNAME, LRETURN, LBREAK, LCONTINUE, LFALL:
switch tok {
case LBREAK, LCONTINUE, LFALL, LRETURN:
l.nlsemi = true
}
l.tok = int32(s.Lexical)
l.tok = tok
return
}
}
s := LookupBytes(name)
if Debug['x'] != 0 {
fmt.Printf("lex: ident %s\n", s)
}
l.sym_ = s
l.nlsemi = true
l.tok = LNAME
}
var keywords = map[string]int32{
"break": LBREAK,
"case": LCASE,
"chan": LCHAN,
"const": LCONST,
"continue": LCONTINUE,
"default": LDEFAULT,
"defer": LDEFER,
"else": LELSE,
"fallthrough": LFALL,
"for": LFOR,
"func": LFUNC,
"go": LGO,
"goto": LGOTO,
"if": LIF,
"import": LIMPORT,
"interface": LINTERFACE,
"map": LMAP,
"package": LPACKAGE,
"range": LRANGE,
"return": LRETURN,
"select": LSELECT,
"struct": LSTRUCT,
"switch": LSWITCH,
"type": LTYPE,
"var": LVAR,
// 💩
"notwithstanding": LIGNORE,
"thetruthofthematter": LIGNORE,
"despiteallobjections": LIGNORE,
"whereas": LIGNORE,
"insofaras": LIGNORE,
}
func (l *lexer) number(c rune) {
......@@ -1993,80 +2041,47 @@ func (l *lexer) hexchar(n int) uint32 {
var syms = []struct {
name string
lexical int
etype EType
op Op
}{
// basic types
{"int8", LNAME, TINT8, OXXX},
{"int16", LNAME, TINT16, OXXX},
{"int32", LNAME, TINT32, OXXX},
{"int64", LNAME, TINT64, OXXX},
{"uint8", LNAME, TUINT8, OXXX},
{"uint16", LNAME, TUINT16, OXXX},
{"uint32", LNAME, TUINT32, OXXX},
{"uint64", LNAME, TUINT64, OXXX},
{"float32", LNAME, TFLOAT32, OXXX},
{"float64", LNAME, TFLOAT64, OXXX},
{"complex64", LNAME, TCOMPLEX64, OXXX},
{"complex128", LNAME, TCOMPLEX128, OXXX},
{"bool", LNAME, TBOOL, OXXX},
{"string", LNAME, TSTRING, OXXX},
{"any", LNAME, TANY, OXXX},
{"break", LBREAK, Txxx, OXXX},
{"case", LCASE, Txxx, OXXX},
{"chan", LCHAN, Txxx, OXXX},
{"const", LCONST, Txxx, OXXX},
{"continue", LCONTINUE, Txxx, OXXX},
{"default", LDEFAULT, Txxx, OXXX},
{"else", LELSE, Txxx, OXXX},
{"defer", LDEFER, Txxx, OXXX},
{"fallthrough", LFALL, Txxx, OXXX},
{"for", LFOR, Txxx, OXXX},
{"func", LFUNC, Txxx, OXXX},
{"go", LGO, Txxx, OXXX},
{"goto", LGOTO, Txxx, OXXX},
{"if", LIF, Txxx, OXXX},
{"import", LIMPORT, Txxx, OXXX},
{"interface", LINTERFACE, Txxx, OXXX},
{"map", LMAP, Txxx, OXXX},
{"package", LPACKAGE, Txxx, OXXX},
{"range", LRANGE, Txxx, OXXX},
{"return", LRETURN, Txxx, OXXX},
{"select", LSELECT, Txxx, OXXX},
{"struct", LSTRUCT, Txxx, OXXX},
{"switch", LSWITCH, Txxx, OXXX},
{"type", LTYPE, Txxx, OXXX},
{"var", LVAR, Txxx, OXXX},
{"append", LNAME, Txxx, OAPPEND},
{"cap", LNAME, Txxx, OCAP},
{"close", LNAME, Txxx, OCLOSE},
{"complex", LNAME, Txxx, OCOMPLEX},
{"copy", LNAME, Txxx, OCOPY},
{"delete", LNAME, Txxx, ODELETE},
{"imag", LNAME, Txxx, OIMAG},
{"len", LNAME, Txxx, OLEN},
{"make", LNAME, Txxx, OMAKE},
{"new", LNAME, Txxx, ONEW},
{"panic", LNAME, Txxx, OPANIC},
{"print", LNAME, Txxx, OPRINT},
{"println", LNAME, Txxx, OPRINTN},
{"real", LNAME, Txxx, OREAL},
{"recover", LNAME, Txxx, ORECOVER},
{"notwithstanding", LIGNORE, Txxx, OXXX},
{"thetruthofthematter", LIGNORE, Txxx, OXXX},
{"despiteallobjections", LIGNORE, Txxx, OXXX},
{"whereas", LIGNORE, Txxx, OXXX},
{"insofaras", LIGNORE, Txxx, OXXX},
{"int8", TINT8, OXXX},
{"int16", TINT16, OXXX},
{"int32", TINT32, OXXX},
{"int64", TINT64, OXXX},
{"uint8", TUINT8, OXXX},
{"uint16", TUINT16, OXXX},
{"uint32", TUINT32, OXXX},
{"uint64", TUINT64, OXXX},
{"float32", TFLOAT32, OXXX},
{"float64", TFLOAT64, OXXX},
{"complex64", TCOMPLEX64, OXXX},
{"complex128", TCOMPLEX128, OXXX},
{"bool", TBOOL, OXXX},
{"string", TSTRING, OXXX},
{"any", TANY, OXXX},
// builtin funcs
{"append", Txxx, OAPPEND},
{"cap", Txxx, OCAP},
{"close", Txxx, OCLOSE},
{"complex", Txxx, OCOMPLEX},
{"copy", Txxx, OCOPY},
{"delete", Txxx, ODELETE},
{"imag", Txxx, OIMAG},
{"len", Txxx, OLEN},
{"make", Txxx, OMAKE},
{"new", Txxx, ONEW},
{"panic", Txxx, OPANIC},
{"print", Txxx, OPRINT},
{"println", Txxx, OPRINTN},
{"real", Txxx, OREAL},
{"recover", Txxx, ORECOVER},
}
// lexinit initializes known symbols and the basic types.
func lexinit() {
for _, s := range syms {
lex := s.lexical
s1 := Lookup(s.name)
s1.Lexical = uint16(lex)
if etype := s.etype; etype != Txxx {
if int(etype) >= len(Types) {
Fatalf("lexinit: %s bad etype", s.name)
......@@ -2083,7 +2098,6 @@ func lexinit() {
Types[etype] = t
}
s2.Lexical = LNAME
s2.Def = typenod(t)
s2.Def.Name = new(Name)
continue
......@@ -2092,7 +2106,6 @@ func lexinit() {
// TODO(marvin): Fix Node.EType type union.
if etype := s.op; etype != OXXX {
s2 := Pkglookup(s.name, builtinpkg)
s2.Lexical = LNAME
s2.Def = Nod(ONAME, nil, nil)
s2.Def.Sym = s2
s2.Def.Etype = EType(etype)
......@@ -2171,46 +2184,29 @@ func lexinit1() {
t.Type.Type = f
// error type
s := Lookup("error")
s.Lexical = LNAME
s1 := Pkglookup("error", builtinpkg)
s := Pkglookup("error", builtinpkg)
errortype = t
errortype.Sym = s1
s1.Lexical = LNAME
s1.Def = typenod(errortype)
errortype.Sym = s
s.Def = typenod(errortype)
// byte alias
s = Lookup("byte")
s.Lexical = LNAME
s1 = Pkglookup("byte", builtinpkg)
s = Pkglookup("byte", builtinpkg)
bytetype = typ(TUINT8)
bytetype.Sym = s1
s1.Lexical = LNAME
s1.Def = typenod(bytetype)
s1.Def.Name = new(Name)
bytetype.Sym = s
s.Def = typenod(bytetype)
s.Def.Name = new(Name)
// rune alias
s = Lookup("rune")
s.Lexical = LNAME
s1 = Pkglookup("rune", builtinpkg)
s = Pkglookup("rune", builtinpkg)
runetype = typ(TINT32)
runetype.Sym = s1
s1.Lexical = LNAME
s1.Def = typenod(runetype)
s1.Def.Name = new(Name)
runetype.Sym = s
s.Def = typenod(runetype)
s.Def.Name = new(Name)
}
func lexfini() {
for i := range syms {
lex := syms[i].lexical
if lex != LNAME {
continue
}
s := Lookup(syms[i].name)
s.Lexical = uint16(lex)
etype := syms[i].etype
if etype != Txxx && (etype != TANY || Debug['A'] != 0) && s.Def == nil {
......
src/cmd/compile/internal/gc/subr.go
View file @ 071e43a9
......@@ -240,7 +240,6 @@ func (pkg *Pkg) Lookup(name string) *Sym {
s := &Sym{
Name: name,
Pkg: pkg,
Lexical: LNAME,
}
if name == "init" {
initSyms = append(initSyms, s)
......
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