Golang Object.Name方法代码示例

func isStringer(obj types.Object) bool {
	switch obj := obj.(type) {
	case *types.Func:
		if obj.Name() != "String" {
			return false
		}
		sig, ok := obj.Type().(*types.Signature)
		if !ok {
			return false
		}
		if sig.Recv() == nil {
			return false
		}
		if sig.Params().Len() != 0 {
			return false
		}
		res := sig.Results()
		if res.Len() != 1 {
			return false
		}
		ret := res.At(0).Type()
		if ret != types.Universe.Lookup("string").Type() {
			return false
		}
		return true
	default:
		return false
	}

	return false
}

// lookup returns the address of the named variable identified by obj
// that is local to function f or one of its enclosing functions.
// If escaping, the reference comes from a potentially escaping pointer
// expression and the referent must be heap-allocated.
//
func (f *Function) lookup(obj types.Object, escaping bool) Value {
	if v, ok := f.objects[obj]; ok {
		if alloc, ok := v.(*Alloc); ok && escaping {
			alloc.Heap = true
		}
		return v // function-local var (address)
	}

	// Definition must be in an enclosing function;
	// plumb it through intervening closures.
	if f.parent == nil {
		panic("no Value for type.Object " + obj.Name())
	}
	outer := f.parent.lookup(obj, true) // escaping
	v := &FreeVar{
		name:   obj.Name(),
		typ:    outer.Type(),
		pos:    outer.Pos(),
		outer:  outer,
		parent: f,
	}
	f.objects[obj] = v
	f.FreeVars = append(f.FreeVars, v)
	return v
}

func (r *Unexporter) selectionConflict(objsToUpdate map[types.Object]string, from types.Object, to string, delta int, syntax *ast.SelectorExpr, obj types.Object) {
	rename := r.errorf(from.Pos(), "renaming this %s %q to %q",
		objectKind(from), from.Name(), to)

	switch {
	case delta < 0:
		// analogous to sub-block conflict
		r.warn(from, rename,
			r.errorf(syntax.Sel.Pos(),
				"\twould change the referent of this selection"),
			r.errorf(obj.Pos(), "\tof this %s", objectKind(obj)))
	case delta == 0:
		// analogous to same-block conflict
		r.warn(from, rename,
			r.errorf(syntax.Sel.Pos(),
				"\twould make this reference ambiguous"),
			r.errorf(obj.Pos(), "\twith this %s", objectKind(obj)))
	case delta > 0:
		// analogous to super-block conflict
		r.warn(from, rename,
			r.errorf(syntax.Sel.Pos(),
				"\twould shadow this selection"),
			r.errorf(obj.Pos(), "\tof the %s declared here",
				objectKind(obj)))
	}
}

func formatMember(obj types.Object, maxname int) string {
	var buf bytes.Buffer
	fmt.Fprintf(&buf, "%-5s %-*s", tokenOf(obj), maxname, obj.Name())
	switch obj := obj.(type) {
	case *types.Const:
		fmt.Fprintf(&buf, " %s = %s", types.TypeString(obj.Pkg(), obj.Type()), obj.Val().String())

	case *types.Func:
		fmt.Fprintf(&buf, " %s", types.TypeString(obj.Pkg(), obj.Type()))

	case *types.TypeName:
		// Abbreviate long aggregate type names.
		var abbrev string
		switch t := obj.Type().Underlying().(type) {
		case *types.Interface:
			if t.NumMethods() > 1 {
				abbrev = "interface{...}"
			}
		case *types.Struct:
			if t.NumFields() > 1 {
				abbrev = "struct{...}"
			}
		}
		if abbrev == "" {
			fmt.Fprintf(&buf, " %s", types.TypeString(obj.Pkg(), obj.Type().Underlying()))
		} else {
			fmt.Fprintf(&buf, " %s", abbrev)
		}

	case *types.Var:
		fmt.Fprintf(&buf, " %s", types.TypeString(obj.Pkg(), obj.Type()))
	}
	return buf.String()
}

// memberFromObject populates package pkg with a member for the
// typechecker object obj.
//
// For objects from Go source code, syntax is the associated syntax
// tree (for funcs and vars only); it will be used during the build
// phase.
//
func memberFromObject(pkg *Package, obj types.Object, syntax ast.Node) {
	name := obj.Name()
	switch obj := obj.(type) {
	case *types.TypeName:
		pkg.Members[name] = &Type{
			object: obj,
			pkg:    pkg,
		}

	case *types.Const:
		c := &NamedConst{
			object: obj,
			Value:  NewConst(obj.Val(), obj.Type()),
			pkg:    pkg,
		}
		pkg.values[obj] = c.Value
		pkg.Members[name] = c

	case *types.Var:
		g := &Global{
			Pkg:    pkg,
			name:   name,
			object: obj,
			typ:    types.NewPointer(obj.Type()), // address
			pos:    obj.Pos(),
		}
		pkg.values[obj] = g
		pkg.Members[name] = g

	case *types.Func:
		sig := obj.Type().(*types.Signature)
		if sig.Recv() == nil && name == "init" {
			pkg.ninit++
			name = fmt.Sprintf("init#%d", pkg.ninit)
		}
		fn := &Function{
			name:      name,
			object:    obj,
			Signature: sig,
			syntax:    syntax,
			pos:       obj.Pos(),
			Pkg:       pkg,
			Prog:      pkg.Prog,
		}
		if syntax == nil {
			fn.Synthetic = "loaded from gc object file"
		}

		pkg.values[obj] = fn
		if sig.Recv() == nil {
			pkg.Members[name] = fn // package-level function
		}

	default: // (incl. *types.Package)
		panic("unexpected Object type: " + obj.String())
	}
}

func (f *Function) addParamObj(obj types.Object) *Parameter {
	name := obj.Name()
	if name == "" {
		name = fmt.Sprintf("arg%d", len(f.Params))
	}
	param := f.addParam(name, obj.Type(), obj.Pos())
	param.object = obj
	return param
}

// addSpilledParam declares a parameter that is pre-spilled to the
// stack; the function body will load/store the spilled location.
// Subsequent lifting will eliminate spills where possible.
//
func (f *Function) addSpilledParam(obj types.Object) {
	param := f.addParamObj(obj)
	spill := &Alloc{Comment: obj.Name()}
	spill.setType(types.NewPointer(obj.Type()))
	spill.setPos(obj.Pos())
	f.objects[obj] = spill
	f.Locals = append(f.Locals, spill)
	f.emit(spill)
	f.emit(&Store{Addr: spill, Val: param})
}

func (sym *symtab) addSymbol(obj types.Object) {
	fn := types.ObjectString(obj, nil)
	n := obj.Name()
	pkg := obj.Pkg()
	id := n
	if pkg != nil {
		id = pkg.Name() + "_" + n
	}
	switch obj.(type) {
	case *types.Const:
		sym.syms[fn] = &symbol{
			gopkg:   pkg,
			goobj:   obj,
			kind:    skConst,
			id:      id,
			goname:  n,
			cgoname: "cgo_const_" + id,
			cpyname: "cpy_const_" + id,
		}
		sym.addType(obj, obj.Type())

	case *types.Var:
		sym.syms[fn] = &symbol{
			gopkg:   pkg,
			goobj:   obj,
			kind:    skVar,
			id:      id,
			goname:  n,
			cgoname: "cgo_var_" + id,
			cpyname: "cpy_var_" + id,
		}
		sym.addType(obj, obj.Type())

	case *types.Func:
		sym.syms[fn] = &symbol{
			gopkg:   pkg,
			goobj:   obj,
			kind:    skFunc,
			id:      id,
			goname:  n,
			cgoname: "cgo_func_" + id,
			cpyname: "cpy_func_" + id,
		}
		sig := obj.Type().Underlying().(*types.Signature)
		sym.processTuple(sig.Params())
		sym.processTuple(sig.Results())

	case *types.TypeName:
		sym.addType(obj, obj.Type())

	default:
		panic(fmt.Errorf("gopy: handled object [%#v]", obj))
	}
}

func (r *resolver) defineObject(b *Block, name string, obj types.Object) {
	if obj.Name() == "_" {
		return
	}
	i := len(b.bindings)
	b.bindings = append(b.bindings, obj)
	b.index[name] = i
	if trace {
		logf("def %s = %s in %s\n", name, types.ObjectString(obj, r.qualifier), b)
	}
	r.result.Defs[obj] = b
}

func newObject(obj types.Object, sel *types.Selection) (*Object, error) {
	// WARN: Dev only
	if sel != nil {
		return newSelector(sel)
	}
	o := &Object{
		Name: obj.Name(),
		pos:  obj.Pos(),
	}
	o.setPkg(obj.Pkg())
	switch typ := obj.(type) {
	case *types.PkgName:
		o.ObjType = Package
		if p := typ.Imported(); p != nil {
			o.setPkg(p)
		}
	case *types.Const:
		o.ObjType = Const
	case *types.TypeName:
		o.ObjType = TypeName
	case *types.Var:
		o.ObjType = Var
		o.IsField = typ.IsField()
		if t, ok := derefType(typ.Type()).(*types.Named); ok {
			o.ObjType = TypeName
			// WARN: This looks wrong
			o.IsField = false
			if obj := t.Obj(); obj != nil {
				o.Name = obj.Name()
				o.setPkg(obj.Pkg())
				o.pos = obj.Pos() // WARN
			}
		}
	case *types.Func:
		if sig := typ.Type().(*types.Signature); sig != nil {
			o.ObjType = Func
		} else {
			switch r := derefType(sig.Recv().Type()).(type) {
			case *types.Named:
				o.ObjType = Method
				o.setParent(r.Obj())
			case *types.Interface:
				o.ObjType = Interface
			default:
				// This should never happen
			}
		}
	default:
		// TODO: log type
		o.ObjType = Bad
	}
	return o, nil
}

func (e *Export) checkInLexicalScope(from types.Object, to string) {
	info := e.u.pkgInfo
	lexinfo := lexical.Structure(e.u.prog.Fset, info.Pkg, &info.Info, info.Files)

	b := lexinfo.Defs[from] // the block defining the 'from' object
	if b != nil {
		to, toBlock := b.Lookup(to)
		if toBlock == b {
			e.Conflicting = true
			return // same-block conflict
		} else if toBlock != nil {
			for _, ref := range lexinfo.Refs[to] {
				if obj, _ := ref.Env.Lookup(from.Name()); obj == from {
					e.Conflicting = true
					return // super-block conflict
				}
			}
		}
	}

	// Check for sub-block conflict.
	// Is there an intervening definition of r.to between
	// the block defining 'from' and some reference to it?
	for _, ref := range lexinfo.Refs[from] {
		_, fromBlock := ref.Env.Lookup(from.Name())
		fromDepth := fromBlock.Depth()

		to, toBlock := ref.Env.Lookup(to)
		if to != nil {
			// sub-block conflict
			if toBlock.Depth() > fromDepth {
				e.Conflicting = true
				return
			}
		}
	}

	// Renaming a type that is used as an embedded field
	// requires renaming the field too. e.g.
	// 	type T int // if we rename this to U..
	// 	var s struct {T}
	// 	print(s.T) // ...this must change too
	if _, ok := from.(*types.TypeName); ok {
		for id, obj := range info.Uses {
			if obj == from {
				if field := info.Defs[id]; field != nil {
					e.check(field, to)
				}
			}
		}
	}
}

func (p *exporter) obj(obj types.Object) {
	if trace {
		p.tracef("object %s {\n", obj.Name())
		defer p.tracef("}\n")
	}

	switch obj := obj.(type) {
	case *types.Const:
		p.int(constTag)
		p.string(obj.Name())
		p.typ(obj.Type())
		p.value(obj.Val())
	case *types.TypeName:
		p.int(typeTag)
		// name is written by corresponding named type
		p.typ(obj.Type().(*types.Named))
	case *types.Var:
		p.int(varTag)
		p.string(obj.Name())
		p.typ(obj.Type())
	case *types.Func:
		p.int(funcTag)
		p.string(obj.Name())
		p.typ(obj.Type())
	default:
		panic(fmt.Sprintf("unexpected object type %T", obj))
	}
}

func printObject(u *unexporter.Unexporter, o types.Object) {
	var objName string
	if simpleNamesFlag {
		objName = o.Name()
	} else {
		objName = o.String()
	}
	if showFilename {
		pos := u.PositionForObject(o)
		fmt.Printf("%s:%d:%d: %s\n", pos.Filename, pos.Line, pos.Column, objName)
	} else {
		fmt.Println(objName)
	}
}

func (r *renamer) checkExport(id *ast.Ident, pkg *types.Package, from types.Object) bool {
	// Reject cross-package references if r.to is unexported.
	// (Such references may be qualified identifiers or field/method
	// selections.)
	if !ast.IsExported(r.to) && pkg != from.Pkg() {
		r.errorf(from.Pos(),
			"renaming this %s %q to %q would make it unexported",
			objectKind(from), from.Name(), r.to)
		r.errorf(id.Pos(), "\tbreaking references from packages such as %q",
			pkg.Path())
		return false
	}
	return true
}

func getKey(obj types.Object) object {
	if obj == nil {
		return object{}
	}

	pkg := obj.Pkg()
	pkgPath := ""
	if pkg != nil {
		pkgPath = pkg.Path()
	}

	return object{
		pkgPath: pkgPath,
		name:    obj.Name(),
	}
}