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Commit 0061e561 authored by Rob Pike's avatar Rob Pike
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Add names to types to avoid recursive explosion and to get 

the right answer when a type name redefines an existing type.

R=rsc
DELTA=133  (53 added, 8 deleted, 72 changed)
OCL=17637
CL=17639
parent 79985fa5
Show whitespace changes
Inline Side-by-side
Showing with 111 additions and 66 deletions
usr/r/reflect/main.go
View file @ 0061e561
......@@ -9,12 +9,12 @@ import (
)
func typedump(s string) {
t := reflect.ParseTypeString(s);
t := reflect.ParseTypeString("", s);
print(reflect.TypeToString(t),"; size = ", t.Size(), "\n");
}
func valuedump(s string) {
t := reflect.ParseTypeString(s);
t := reflect.ParseTypeString("", s);
v := reflect.NewInitValue(t);
switch v.Kind() {
case reflect.Int8Kind:
......
usr/r/reflect/tostring.go
View file @ 0061e561
......@@ -35,6 +35,9 @@ func TypeFieldsToString(t HasFields, sep string) string {
func TypeToString(typ Type) string {
var str string;
if name := typ.Name(); name != "" {
return name
}
switch(typ.Kind()) {
case MissingKind:
return "$missing$";
......
usr/r/reflect/type.go
View file @ 0061e561
......@@ -43,14 +43,15 @@ var MissingString = "$missing$" // syntactic name for undefined type names
export type Type interface {
Kind() int;
Name() string;
Size() uint64;
}
// -- Basic
type BasicType struct{
name string;
kind int;
name string;
size uint64;
}
......@@ -106,18 +107,13 @@ func (t *StubType) Get() Type {
return t.typ
}
func NewStubType(t Type) *StubType {
func NewStubType(name string, t Type) *StubType {
s := new(StubType);
s.name = name;
s.typ = t;
return s;
}
func NewNamedStubType(n string) *StubType {
s := new(StubType);
s.name = n;
return s;
}
// -- Pointer
export type PtrType interface {
......@@ -125,13 +121,18 @@ export type PtrType interface {
}
type PtrTypeStruct struct {
sub *StubType
name string;
sub *StubType;
}
func (t *PtrTypeStruct) Kind() int {
return PtrKind
}
func (t *PtrTypeStruct) Name() string {
return t.name
}
func (t *PtrTypeStruct) Size() uint64 {
return ptrsize
}
......@@ -140,8 +141,9 @@ func (t *PtrTypeStruct) Sub() Type {
return t.sub.Get()
}
func NewPtrTypeStruct(sub *StubType) *PtrTypeStruct {
func NewPtrTypeStruct(name string, sub *StubType) *PtrTypeStruct {
t := new(PtrTypeStruct);
t.name = name;
t.sub = sub;
return t;
}
......@@ -155,6 +157,7 @@ export type ArrayType interface {
}
type ArrayTypeStruct struct {
name string;
elem *StubType;
open bool; // otherwise fixed size
len uint64;
......@@ -164,6 +167,10 @@ func (t *ArrayTypeStruct) Kind() int {
return ArrayKind
}
func (t *ArrayTypeStruct) Name() string {
return t.name
}
func (t *ArrayTypeStruct) Size() uint64 {
if t.open {
return ptrsize // open arrays are pointers to structures
......@@ -184,8 +191,9 @@ func (t *ArrayTypeStruct) Elem() Type {
return t.elem.Get()
}
func NewArrayTypeStruct(open bool, len uint64, elem *StubType) *ArrayTypeStruct {
func NewArrayTypeStruct(name string, open bool, len uint64, elem *StubType) *ArrayTypeStruct {
t := new(ArrayTypeStruct);
t.name = name;
t.open = open;
t.len = len;
t.elem = elem;
......@@ -200,6 +208,7 @@ export type MapType interface {
}
type MapTypeStruct struct {
name string;
key *StubType;
elem *StubType;
}
......@@ -208,6 +217,10 @@ func (t *MapTypeStruct) Kind() int {
return MapKind
}
func (t *MapTypeStruct) Name() string {
return t.name
}
func (t *MapTypeStruct) Size() uint64 {
panic("reflect.type: map.Size(): cannot happen");
return 0
......@@ -221,8 +234,9 @@ func (t *MapTypeStruct) Elem() Type {
return t.elem.Get()
}
func NewMapTypeStruct(key, elem *StubType) *MapTypeStruct {
func NewMapTypeStruct(name string, key, elem *StubType) *MapTypeStruct {
t := new(MapTypeStruct);
t.name = name;
t.key = key;
t.elem = elem;
return t;
......@@ -242,6 +256,7 @@ export const ( // channel direction
)
type ChanTypeStruct struct {
name string;
elem *StubType;
dir int;
}
......@@ -250,6 +265,10 @@ func (t *ChanTypeStruct) Kind() int {
return ChanKind
}
func (t *ChanTypeStruct) Name() string {
return t.name
}
func (t *ChanTypeStruct) Size() uint64 {
panic("reflect.type: chan.Size(): cannot happen");
return 0
......@@ -264,8 +283,9 @@ func (t *ChanTypeStruct) Elem() Type {
return t.elem.Get()
}
func NewChanTypeStruct(dir int, elem *StubType) *ChanTypeStruct {
func NewChanTypeStruct(name string, dir int, elem *StubType) *ChanTypeStruct {
t := new(ChanTypeStruct);
t.name = name;
t.dir = dir;
t.elem = elem;
return t;
......@@ -286,6 +306,7 @@ type Field struct {
}
type StructTypeStruct struct {
name string;
field *[]Field;
}
......@@ -293,6 +314,10 @@ func (t *StructTypeStruct) Kind() int {
return StructKind
}
func (t *StructTypeStruct) Name() string {
return t.name
}
// TODO: not portable; depends on 6g
func (t *StructTypeStruct) Size() uint64 {
size := uint64(0);
......@@ -324,8 +349,9 @@ func (t *StructTypeStruct) Len() int {
return len(t.field)
}
func NewStructTypeStruct(field *[]Field) *StructTypeStruct {
func NewStructTypeStruct(name string, field *[]Field) *StructTypeStruct {
t := new(StructTypeStruct);
t.name = name;
t.field = field;
return t;
}
......@@ -338,6 +364,7 @@ export type InterfaceType interface {
}
type InterfaceTypeStruct struct {
name string;
field *[]Field;
}
......@@ -349,8 +376,9 @@ func (t *InterfaceTypeStruct) Len() int {
return len(t.field)
}
func NewInterfaceTypeStruct(field *[]Field) *InterfaceTypeStruct {
func NewInterfaceTypeStruct(name string, field *[]Field) *InterfaceTypeStruct {
t := new(InterfaceTypeStruct);
t.name = name;
t.field = field;
return t;
}
......@@ -359,6 +387,10 @@ func (t *InterfaceTypeStruct) Kind() int {
return InterfaceKind
}
func (t *InterfaceTypeStruct) Name() string {
return t.name
}
func (t *InterfaceTypeStruct) Size() uint64 {
return interfacesize
}
......@@ -371,6 +403,7 @@ export type FuncType interface {
}
type FuncTypeStruct struct {
name string;
in *StructTypeStruct;
out *StructTypeStruct;
}
......@@ -379,6 +412,10 @@ func (t *FuncTypeStruct) Kind() int {
return FuncKind
}
func (t *FuncTypeStruct) Name() string {
return t.name
}
func (t *FuncTypeStruct) Size() uint64 {
panic("reflect.type: func.Size(): cannot happen");
return 0
......@@ -395,8 +432,9 @@ func (t *FuncTypeStruct) Out() StructType {
return t.out
}
func NewFuncTypeStruct(in, out *StructTypeStruct) *FuncTypeStruct {
func NewFuncTypeStruct(name string, in, out *StructTypeStruct) *FuncTypeStruct {
t := new(FuncTypeStruct);
t.name = name;
t.in = in;
t.out = out;
return t;
......@@ -452,20 +490,20 @@ func init() {
types["string"] = &String;
// Basics get prebuilt stubs
MissingStub = NewStubType(Missing);
MissingStub = NewStubType(MissingString, Missing);
basicstub[MissingString] = MissingStub;
basicstub["int8"] = NewStubType(Int8);
basicstub["int16"] = NewStubType(Int16);
basicstub["int32"] = NewStubType(Int32);
basicstub["int64"] = NewStubType(Int64);
basicstub["uint8"] = NewStubType(Uint8);
basicstub["uint16"] = NewStubType(Uint16);
basicstub["uint32"] = NewStubType(Uint32);
basicstub["uint64"] = NewStubType(Uint64);
basicstub["float32"] = NewStubType(Float32);
basicstub["float64"] = NewStubType(Float64);
basicstub["float80"] = NewStubType(Float80);
basicstub["string"] = NewStubType(String);
basicstub["int8"] = NewStubType("int8", Int8);
basicstub["int16"] = NewStubType("int16", Int16);
basicstub["int32"] = NewStubType("int32", Int32);
basicstub["int64"] = NewStubType("int64", Int64);
basicstub["uint8"] = NewStubType("uint8", Uint8);
basicstub["uint16"] = NewStubType("uint16", Uint16);
basicstub["uint32"] = NewStubType("uint32", Uint32);
basicstub["uint64"] = NewStubType("uint64", Uint64);
basicstub["float32"] = NewStubType("float32", Float32);
basicstub["float64"] = NewStubType("float64", Float64);
basicstub["float80"] = NewStubType("float80", Float80);
basicstub["string"] = NewStubType("string", String);
Unlock();
}
......@@ -571,9 +609,9 @@ func (p *Parser) Next() {
p.token = p.str[start : p.index];
}
func (p *Parser) Type() *StubType
func (p *Parser) Type(name string) *StubType
func (p *Parser) Array() *StubType {
func (p *Parser) Array(name string) *StubType {
size := uint64(0);
open := true;
if p.token != "]" {
......@@ -592,25 +630,25 @@ func (p *Parser) Array() *StubType {
return MissingStub
}
p.Next();
elemtype := p.Type();
return NewStubType(NewArrayTypeStruct(open, size, elemtype));
elemtype := p.Type("");
return NewStubType(name, NewArrayTypeStruct(name, open, size, elemtype));
}
func (p *Parser) Map() *StubType {
func (p *Parser) Map(name string) *StubType {
if p.token != "[" {
return MissingStub
}
p.Next();
keytype := p.Type();
keytype := p.Type("");
if p.token != "]" {
return MissingStub
}
p.Next();
elemtype := p.Type();
return NewStubType(NewMapTypeStruct(keytype, elemtype));
elemtype := p.Type("");
return NewStubType(name, NewMapTypeStruct(name, keytype, elemtype));
}
func (p *Parser) Chan(dir int) *StubType {
func (p *Parser) Chan(name string, dir int) *StubType {
if p.token == "<-" {
if dir != BothDir {
return MissingStub
......@@ -618,8 +656,8 @@ func (p *Parser) Chan(dir int) *StubType {
p.Next();
dir = SendDir;
}
elemtype := p.Type();
return NewStubType(NewChanTypeStruct(dir, elemtype));
elemtype := p.Type("");
return NewStubType(name, NewChanTypeStruct(name, dir, elemtype));
}
// Parse array of fields for struct, interface, and func arguments
......@@ -636,7 +674,7 @@ func (p *Parser) Fields(sep string) *[]Field {
}
a[nf].name = p.token;
p.Next();
a[nf].typ = p.Type();
a[nf].typ = p.Type("");
nf++;
if p.token != sep {
break;
......@@ -646,59 +684,59 @@ func (p *Parser) Fields(sep string) *[]Field {
return a[0:nf];
}
func (p *Parser) Struct() *StubType {
func (p *Parser) Struct(name string) *StubType {
f := p.Fields(";");
if p.token != "}" {
return MissingStub;
}
p.Next();
return NewStubType(NewStructTypeStruct(f));
return NewStubType(name, NewStructTypeStruct(name, f));
}
func (p *Parser) Interface() *StubType {
func (p *Parser) Interface(name string) *StubType {
f := p.Fields(";");
if p.token != "}" {
return MissingStub;
}
p.Next();
return NewStubType(NewInterfaceTypeStruct(f));
return NewStubType(name, NewInterfaceTypeStruct(name, f));
}
func (p *Parser) Func() *StubType {
func (p *Parser) Func(name string) *StubType {
// may be 1 or 2 parenthesized lists
f1 := NewStructTypeStruct(p.Fields(","));
f1 := NewStructTypeStruct("", p.Fields(","));
if p.token != ")" {
return MissingStub;
}
p.Next();
if p.token != "(" {
// 1 list: the in parameters only
return NewStubType(NewFuncTypeStruct(f1, nil));
return NewStubType(name, NewFuncTypeStruct(name, f1, nil));
}
p.Next();
f2 := NewStructTypeStruct(p.Fields(","));
f2 := NewStructTypeStruct("", p.Fields(","));
if p.token != ")" {
return MissingStub;
}
p.Next();
// 2 lists: the in and out parameters are present
return NewStubType(NewFuncTypeStruct(f1, f2));
return NewStubType(name, NewFuncTypeStruct(name, f1, f2));
}
func (p *Parser) Type() *StubType {
func (p *Parser) Type(name string) *StubType {
dir := BothDir;
switch {
case p.token == "":
return nil;
case p.token == "*":
p.Next();
return NewStubType(NewPtrTypeStruct(p.Type()));
return NewStubType(name, NewPtrTypeStruct(name, p.Type("")));
case p.token == "[":
p.Next();
return p.Array();
return p.Array(name);
case p.token == "map":
p.Next();
return p.Map();
return p.Map(name);
case p.token == "<-":
p.Next();
dir = RecvDir;
......@@ -708,24 +746,24 @@ func (p *Parser) Type() *StubType {
fallthrough;
case p.token == "chan":
p.Next();
return p.Chan(dir);
return p.Chan(name, dir);
case p.token == "struct":
p.Next();
if p.token != "{" {
return MissingStub
}
p.Next();
return p.Struct();
return p.Struct(name);
case p.token == "interface":
p.Next();
if p.token != "{" {
return MissingStub
}
p.Next();
return p.Interface();
return p.Interface(name);
case p.token == "(":
p.Next();
return p.Func();
return p.Func(name);
case isdigit(p.token[0]):
p.Next();
return MissingStub;
......@@ -736,6 +774,11 @@ func (p *Parser) Type() *StubType {
// must be an identifier. is it basic? if so, we have a stub
if s, ok := basicstub[p.token]; ok {
p.Next();
if name != "" {
// Need to make a copy because we are renaming a basic type
b := s.Get();
s = NewStubType(name, NewBasicType(name, b.Kind(), b.Size()));
}
return s
}
// not a basic - must be of the form "P.T"
......@@ -749,17 +792,16 @@ func (p *Parser) Type() *StubType {
p.Next();
return MissingStub;
}
s := new(StubType);
s.name = p.token;
s := NewStubType(p.token, nil);
p.Next();
return s;
}
export func ParseTypeString(str string) Type {
export func ParseTypeString(name, typestring string) Type {
p := new(Parser);
p.str = str;
p.str = typestring;
p.Next();
return p.Type().Get();
return p.Type(name).Get();
}
// Create typestring map from reflect.typestrings() data. Lock is held.
......@@ -819,7 +861,7 @@ func ExpandType(name string) Type {
return *t
}
types[name] = &Missing; // prevent recursion; will overwrite
t1 := ParseTypeString(TypeNameToTypeString(name));
t1 := ParseTypeString(name, TypeNameToTypeString(name));
p := new(Type);
*p = t1;
types[name] = p;
......
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