Gecko [ 167.86.127.34 ]

Name	Size	Permission
testdata	[ DIR ]	drwxr-xr-x
api.go	13.6 KB	-rw-r--r--
api_test.go	41.52 KB	-rw-r--r--
assignments.go	8.58 KB	-rw-r--r--
builtins.go	17.25 KB	-rw-r--r--
builtins_test.go	7.54 KB	-rw-r--r--
call.go	13.86 KB	-rw-r--r--
check.go	12.43 KB	-rw-r--r--
check_test.go	8.65 KB	-rw-r--r--
conversions.go	4.86 KB	-rw-r--r--
decl.go	22.25 KB	-rw-r--r--
errors.go	3.14 KB	-rw-r--r--
eval.go	2.92 KB	-rw-r--r--
eval_test.go	7.12 KB	-rw-r--r--
example_test.go	8.77 KB	-rw-r--r--
expr.go	44.32 KB	-rw-r--r--
exprstring.go	4.54 KB	-rw-r--r--
exprstring_test.go	1.76 KB	-rw-r--r--
gccgosizes.go	1016 B	-rw-r--r--
gotype.go	8.4 KB	-rw-r--r--
hilbert_test.go	3.63 KB	-rw-r--r--
initorder.go	8.84 KB	-rw-r--r--
issues_test.go	12.86 KB	-rw-r--r--
labels.go	7.01 KB	-rw-r--r--
lookup.go	13.05 KB	-rw-r--r--
methodset.go	8.38 KB	-rw-r--r--
object.go	14.69 KB	-rw-r--r--
object_test.go	2.82 KB	-rw-r--r--
objset.go	927 B	-rw-r--r--
operand.go	7.46 KB	-rw-r--r--
package.go	2.19 KB	-rw-r--r--
predicates.go	9.01 KB	-rw-r--r--
resolver.go	20.76 KB	-rw-r--r--
resolver_test.go	4.58 KB	-rw-r--r--
return.go	4.23 KB	-rw-r--r--
scope.go	5.48 KB	-rw-r--r--
selection.go	3.99 KB	-rw-r--r--
self_test.go	2.2 KB	-rw-r--r--
sizes.go	6.61 KB	-rw-r--r--
sizes_test.go	2.46 KB	-rw-r--r--
stdlib_test.go	8.32 KB	-rw-r--r--
stmt.go	22.8 KB	-rw-r--r--
token_test.go	1.21 KB	-rw-r--r--
type.go	16.81 KB	-rw-r--r--
typestring.go	7.8 KB	-rw-r--r--
typestring_test.go	6.56 KB	-rw-r--r--
typexpr.go	20.6 KB	-rw-r--r--
universe.go	6.47 KB	-rw-r--r--

Code Editor : universe.go

// Copyright 2011 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.

// This file sets up the universe scope and the unsafe package.

package types

import (
	"go/constant"
	"go/token"
	"strings"
)

// The Universe scope contains all predeclared objects of Go.
// It is the outermost scope of any chain of nested scopes.
var Universe *Scope

// The Unsafe package is the package returned by an importer
// for the import path "unsafe".
var Unsafe *Package

var (
	universeIota *Const
	universeByte *Basic // uint8 alias, but has name "byte"
	universeRune *Basic // int32 alias, but has name "rune"
)

// Typ contains the predeclared *Basic types indexed by their
// corresponding BasicKind.
//
// The *Basic type for Typ[Byte] will have the name "uint8".
// Use Universe.Lookup("byte").Type() to obtain the specific
// alias basic type named "byte" (and analogous for "rune").
var Typ = []*Basic{
	Invalid: {Invalid, 0, "invalid type"},

Bool:          {Bool, IsBoolean, "bool"},
	Int:           {Int, IsInteger, "int"},
	Int8:          {Int8, IsInteger, "int8"},
	Int16:         {Int16, IsInteger, "int16"},
	Int32:         {Int32, IsInteger, "int32"},
	Int64:         {Int64, IsInteger, "int64"},
	Uint:          {Uint, IsInteger | IsUnsigned, "uint"},
	Uint8:         {Uint8, IsInteger | IsUnsigned, "uint8"},
	Uint16:        {Uint16, IsInteger | IsUnsigned, "uint16"},
	Uint32:        {Uint32, IsInteger | IsUnsigned, "uint32"},
	Uint64:        {Uint64, IsInteger | IsUnsigned, "uint64"},
	Uintptr:       {Uintptr, IsInteger | IsUnsigned, "uintptr"},
	Float32:       {Float32, IsFloat, "float32"},
	Float64:       {Float64, IsFloat, "float64"},
	Complex64:     {Complex64, IsComplex, "complex64"},
	Complex128:    {Complex128, IsComplex, "complex128"},
	String:        {String, IsString, "string"},
	UnsafePointer: {UnsafePointer, 0, "Pointer"},

UntypedBool:    {UntypedBool, IsBoolean | IsUntyped, "untyped bool"},
	UntypedInt:     {UntypedInt, IsInteger | IsUntyped, "untyped int"},
	UntypedRune:    {UntypedRune, IsInteger | IsUntyped, "untyped rune"},
	UntypedFloat:   {UntypedFloat, IsFloat | IsUntyped, "untyped float"},
	UntypedComplex: {UntypedComplex, IsComplex | IsUntyped, "untyped complex"},
	UntypedString:  {UntypedString, IsString | IsUntyped, "untyped string"},
	UntypedNil:     {UntypedNil, IsUntyped, "untyped nil"},
}

var aliases = [...]*Basic{
	{Byte, IsInteger | IsUnsigned, "byte"},
	{Rune, IsInteger, "rune"},
}

func defPredeclaredTypes() {
	for _, t := range Typ {
		def(NewTypeName(token.NoPos, nil, t.name, t))
	}
	for _, t := range aliases {
		def(NewTypeName(token.NoPos, nil, t.name, t))
	}

// Error has a nil package in its qualified name since it is in no package
	res := NewVar(token.NoPos, nil, "", Typ[String])
	sig := &Signature{results: NewTuple(res)}
	err := NewFunc(token.NoPos, nil, "Error", sig)
	typ := &Named{underlying: NewInterfaceType([]*Func{err}, nil).Complete()}
	sig.recv = NewVar(token.NoPos, nil, "", typ)
	def(NewTypeName(token.NoPos, nil, "error", typ))
}

var predeclaredConsts = [...]struct {
	name string
	kind BasicKind
	val  constant.Value
}{
	{"true", UntypedBool, constant.MakeBool(true)},
	{"false", UntypedBool, constant.MakeBool(false)},
	{"iota", UntypedInt, constant.MakeInt64(0)},
}

func defPredeclaredConsts() {
	for _, c := range predeclaredConsts {
		def(NewConst(token.NoPos, nil, c.name, Typ[c.kind], c.val))
	}
}

func defPredeclaredNil() {
	def(&Nil{object{name: "nil", typ: Typ[UntypedNil], color_: black}})
}

// A builtinId is the id of a builtin function.
type builtinId int

const (
	// universe scope
	_Append builtinId = iota
	_Cap
	_Close
	_Complex
	_Copy
	_Delete
	_Imag
	_Len
	_Make
	_New
	_Panic
	_Print
	_Println
	_Real
	_Recover

// package unsafe
	_Alignof
	_Offsetof
	_Sizeof

// testing support
	_Assert
	_Trace
)

var predeclaredFuncs = [...]struct {
	name     string
	nargs    int
	variadic bool
	kind     exprKind
}{
	_Append:  {"append", 1, true, expression},
	_Cap:     {"cap", 1, false, expression},
	_Close:   {"close", 1, false, statement},
	_Complex: {"complex", 2, false, expression},
	_Copy:    {"copy", 2, false, statement},
	_Delete:  {"delete", 2, false, statement},
	_Imag:    {"imag", 1, false, expression},
	_Len:     {"len", 1, false, expression},
	_Make:    {"make", 1, true, expression},
	_New:     {"new", 1, false, expression},
	_Panic:   {"panic", 1, false, statement},
	_Print:   {"print", 0, true, statement},
	_Println: {"println", 0, true, statement},
	_Real:    {"real", 1, false, expression},
	_Recover: {"recover", 0, false, statement},

_Alignof:  {"Alignof", 1, false, expression},
	_Offsetof: {"Offsetof", 1, false, expression},
	_Sizeof:   {"Sizeof", 1, false, expression},

_Assert: {"assert", 1, false, statement},
	_Trace:  {"trace", 0, true, statement},
}

func defPredeclaredFuncs() {
	for i := range predeclaredFuncs {
		id := builtinId(i)
		if id == _Assert || id == _Trace {
			continue // only define these in testing environment
		}
		def(newBuiltin(id))
	}
}

// DefPredeclaredTestFuncs defines the assert and trace built-ins.
// These built-ins are intended for debugging and testing of this
// package only.
func DefPredeclaredTestFuncs() {
	if Universe.Lookup("assert") != nil {
		return // already defined
	}
	def(newBuiltin(_Assert))
	def(newBuiltin(_Trace))
}

func init() {
	Universe = NewScope(nil, token.NoPos, token.NoPos, "universe")
	Unsafe = NewPackage("unsafe", "unsafe")
	Unsafe.complete = true

defPredeclaredTypes()
	defPredeclaredConsts()
	defPredeclaredNil()
	defPredeclaredFuncs()

universeIota = Universe.Lookup("iota").(*Const)
	universeByte = Universe.Lookup("byte").(*TypeName).typ.(*Basic)
	universeRune = Universe.Lookup("rune").(*TypeName).typ.(*Basic)
}

// Objects with names containing blanks are internal and not entered into
// a scope. Objects with exported names are inserted in the unsafe package
// scope; other objects are inserted in the universe scope.
//
func def(obj Object) {
	assert(obj.color() == black)
	name := obj.Name()
	if strings.Contains(name, " ") {
		return // nothing to do
	}
	// fix Obj link for named types
	if typ, ok := obj.Type().(*Named); ok {
		typ.obj = obj.(*TypeName)
	}
	// exported identifiers go into package unsafe
	scope := Universe
	if obj.Exported() {
		scope = Unsafe.scope
		// set Pkg field
		switch obj := obj.(type) {
		case *TypeName:
			obj.pkg = Unsafe
		case *Builtin:
			obj.pkg = Unsafe
		default:
			unreachable()
		}
	}
	if scope.Insert(obj) != nil {
		panic("internal error: double declaration")
	}
}

${this.title}

Code Editor : universe.go