types

package standard library
go1.22.2 Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: Apr 3, 2024 License: BSD-3-Clause Imports: 19 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	CMPlt = Cmp(-1)
	CMPeq = Cmp(0)
	CMPgt = Cmp(1)
)
View Source 
const (
	IgnoreBlankFields componentsIncludeBlankFields = false
	CountBlankFields  componentsIncludeBlankFields = true
)
View Source 
const BADWIDTH = -1000000000

Variables

View Source 
var (
	SlicePtrOffset int64
	SliceLenOffset int64
	SliceCapOffset int64

	SliceSize  int64
	StringSize int64
)

Slices in the runtime are represented by three components: 

type slice struct {
	ptr unsafe.Pointer
	len int
	cap int
}

Strings in the runtime are represented by two components: 

type string struct {
	ptr unsafe.Pointer
	len int
}

These variables are the offsets of fields and sizes of these structs.

View Source 
var (
	// Predeclared alias types. These are actually created as distinct
	// defined types for better error messages, but are then specially
	// treated as identical to their respective underlying types.
	AnyType  *Type
	ByteType *Type
	RuneType *Type

	// Predeclared error interface type.
	ErrorType *Type
	// Predeclared comparable interface type.
	ComparableType *Type

	// Types to represent untyped string and boolean constants.
	UntypedString = newType(TSTRING)
	UntypedBool   = newType(TBOOL)

	// Types to represent untyped numeric constants.
	UntypedInt     = newType(TIDEAL)
	UntypedRune    = newType(TIDEAL)
	UntypedFloat   = newType(TIDEAL)
	UntypedComplex = newType(TIDEAL)
)
View Source 
var (
	// TSSA types. HasPointers assumes these are pointer-free.
	TypeInvalid   = newSSA("invalid")
	TypeMem       = newSSA("mem")
	TypeFlags     = newSSA("flags")
	TypeVoid      = newSSA("void")
	TypeInt128    = newSSA("int128")
	TypeResultMem = newResults([]*Type{TypeMem})
)
View Source 
var (
	IsInt     [NTYPE]bool
	IsFloat   [NTYPE]bool
	IsComplex [NTYPE]bool
	IsSimple  [NTYPE]bool
)
View Source 
var BasicTypeNames = []string{
	TINT:        "int",
	TUINT:       "uint",
	TINT8:       "int8",
	TUINT8:      "uint8",
	TINT16:      "int16",
	TUINT16:     "uint16",
	TINT32:      "int32",
	TUINT32:     "uint32",
	TINT64:      "int64",
	TUINT64:     "uint64",
	TUINTPTR:    "uintptr",
	TFLOAT32:    "float32",
	TFLOAT64:    "float64",
	TCOMPLEX64:  "complex64",
	TCOMPLEX128: "complex128",
	TBOOL:       "bool",
	TANY:        "any",
	TSTRING:     "string",
	TNIL:        "nil",
	TIDEAL:      "untyped number",
	TBLANK:      "blank",
}
View Source 
var CalcSizeDisabled bool

CalcSizeDisabled indicates whether it is safe to calculate Types' widths and alignments. See CalcSize.

View Source 
var DefaultKinds = [...]Kind{
	constant.Bool:    TBOOL,
	constant.String:  TSTRING,
	constant.Int:     TINT,
	constant.Float:   TFLOAT64,
	constant.Complex: TCOMPLEX128,
}

DefaultKinds maps from a constant.Kind to its default Kind.

View Source 
var IsOrdered [NTYPE]bool
View Source 
var MaxWidth int64

MaxWidth is the maximum size of a value on the target architecture.

View Source 
var NewPtrCacheEnabled = true

NewPtrCacheEnabled controls whether *T Types are cached in T. Caching is disabled just before starting the backend. This allows the backend to run concurrently.

View Source 
var NumImport = make(map[string]int)

numImport tracks how often a package with a given name is imported. It is used to provide a better error message (by using the package path to disambiguate) if a package that appears multiple times with the same name appears in an error message.

View Source 
var PtrSize int
View Source 
var RegSize int
View Source 
var ShapePkg = NewPkg("go.shape", "go.shape")

Fake package for shape types (see typecheck.Shapify()).

View Source 
var SimType [NTYPE]Kind
View Source 
var SkipSizeForTracing bool
View Source 
var Types [NTYPE]*Type

Types stores pointers to predeclared named types.

It also stores pointers to several special types:

  • Types[TANY] is the placeholder "any" type recognized by SubstArgTypes.
  • Types[TBLANK] represents the blank variable's type.
  • Types[TINTER] is the canonical "interface{}" type.
  • Types[TNIL] represents the predeclared "nil" value's type.
  • Types[TUNSAFEPTR] is package unsafe's Pointer type.
View Source 
var UntypedTypes = [...]*Type{
	constant.Bool:    UntypedBool,
	constant.String:  UntypedString,
	constant.Int:     UntypedInt,
	constant.Float:   UntypedFloat,
	constant.Complex: UntypedComplex,
}

UntypedTypes maps from a constant.Kind to its untyped Type representation.

Functions

func AlgType added in go1.17 

func AlgType(t *Type) (AlgKind, *Type)

AlgType returns the AlgKind used for comparing and hashing Type t. If it returns ANOEQ, it also returns the component type of t that makes it incomparable.

func AllowsGoVersion added in go1.17 

func AllowsGoVersion(major, minor int) bool

AllowsGoVersion reports whether local package is allowed to use Go version major.minor.

func CalcSize added in go1.17 

func CalcSize(t *Type)

CalcSize calculates and stores the size and alignment for t. If CalcSizeDisabled is set, and the size/alignment have not already been calculated, it calls Fatal. This is used to prevent data races in the back end.

func CalcStructSize added in go1.17 

func CalcStructSize(t *Type)

CalcStructSize calculates the size of t, filling in t.width, t.align, t.intRegs, and t.floatRegs, even if size calculation is otherwise disabled.

func CheckSize added in go1.17 

func CheckSize(t *Type)

func DeferCheckSize added in go1.17 

func DeferCheckSize()

func Identical added in go1.12 

func Identical(t1, t2 *Type) bool

Identical reports whether t1 and t2 are identical types, following the spec rules. Receiver parameter types are ignored. Named (defined) types are only equal if they are pointer-equal - i.e. there must be a unique types.Type for each specific named type. Also, a type containing a shape type is considered identical to another type (shape or not) if their underlying types are the same, or they are both pointers.

func IdenticalIgnoreTags added in go1.12 

func IdenticalIgnoreTags(t1, t2 *Type) bool

IdenticalIgnoreTags is like Identical, but it ignores struct tags for struct identity.

func IdenticalStrict added in go1.18 

func IdenticalStrict(t1, t2 *Type) bool

IdenticalStrict is like Identical, but matches types exactly, without the exception for shapes.

func InitTypes added in go1.18 

func InitTypes(defTypeName func(sym *Sym, typ *Type) Object)

func InternString 

func InternString(b []byte) string

func IsComparable added in go1.17 

func IsComparable(t *Type) bool

IsComparable reports whether t is a comparable type.

func IsDirectIface added in go1.17 

func IsDirectIface(t *Type) bool

Can this type be stored directly in an interface word? Yes, if the representation is a single pointer.

func IsExported added in go1.11 

func IsExported(name string) bool

IsExported reports whether name is an exported Go symbol (that is, whether it begins with an upper-case letter).

func IsInterfaceMethod added in go1.17 

func IsInterfaceMethod(f *Type) bool

IsInterfaceMethod reports whether (field) m is an interface method. Such methods have the special receiver type types.FakeRecvType().

func IsMethodApplicable added in go1.17 

func IsMethodApplicable(t *Type, m *Field) bool

IsMethodApplicable reports whether method m can be called on a value of type t. This is necessary because we compute a single method set for both T and *T, but some *T methods are not applicable to T receivers.

func IsNoInstrumentPkg added in go1.21.0 

func IsNoInstrumentPkg(p *Pkg) bool

IsNoInstrumentPkg reports whether p is a package that should not be instrumented.

func IsNoRacePkg added in go1.21.0 

func IsNoRacePkg(p *Pkg) bool

IsNoRacePkg reports whether p is a package that should not be race instrumented.

func IsPaddedField added in go1.17 

func IsPaddedField(t *Type, i int) bool

IsPaddedField reports whether the i'th field of struct type t is followed by padding.

func IsReflexive added in go1.17 

func IsReflexive(t *Type) bool

IsReflexive reports whether t has a reflexive equality operator. That is, if x==x for all x of type t.

func ParseLangFlag added in go1.17 

func ParseLangFlag()

ParseLangFlag verifies that the -lang flag holds a valid value, and exits if not. It initializes data used by AllowsGoVersion.

func PkgMap added in go1.22.0 

func PkgMap() map[string]*Pkg

func PtrDataSize added in go1.17 

func PtrDataSize(t *Type) int64

PtrDataSize returns the length in bytes of the prefix of t containing pointer data. Anything after this offset is scalar data.

PtrDataSize is only defined for actual Go types. It's an error to use it on compiler-internal types (e.g., TSSA, TRESULTS).

func ReflectSymName added in go1.22.0 

func ReflectSymName(s *Sym) string

ReflectSymName returns the name of s if it's in package "reflect"; otherwise it returns "".

func ResumeCheckSize added in go1.17 

func ResumeCheckSize()

func RoundUp added in go1.20 

func RoundUp(o int64, r int64) int64

RoundUp rounds o to a multiple of r, r is a power of 2.

func RuntimeSymName added in go1.22.0 

func RuntimeSymName(s *Sym) string

RuntimeSymName returns the name of s if it's in package "runtime"; otherwise it returns "".

func SplitVargenSuffix added in go1.20 

func SplitVargenSuffix(name string) (base, suffix string)

SplitVargenSuffix returns name split into a base string and a ·N suffix, if any.

func TypeHasNoAlg added in go1.17 

func TypeHasNoAlg(t *Type) bool

TypeHasNoAlg reports whether t does not have any associated hash/eq algorithms because t, or some component of t, is marked Noalg.

func TypeHash added in go1.17 

func TypeHash(t *Type) uint32

TypeHash computes a hash value for type t to use in type switch statements.

func TypeSymName added in go1.17 

func TypeSymName(t *Type) string

Types

type AlgKind added in go1.17 

type AlgKind int

AlgKind describes the kind of algorithms used for comparing and hashing a Type. 

const (
	ANOEQ AlgKind = iota
	AMEM0
	AMEM8
	AMEM16
	AMEM32
	AMEM64
	AMEM128
	ASTRING
	AINTER
	ANILINTER
	AFLOAT32
	AFLOAT64
	ACPLX64
	ACPLX128

	// Type can be compared/hashed as regular memory.
	AMEM AlgKind = 100

	// Type needs special comparison/hashing functions.
	ASPECIAL AlgKind = -1
)

func (AlgKind) String added in go1.17 

func (i AlgKind) String() string

type Array 

type Array struct {
	Elem  *Type // element type
	Bound int64 // number of elements; <0 if unknown yet
}

Array contains Type fields specific to array types.

type Chan 

type Chan struct {
	Elem *Type   // element type
	Dir  ChanDir // channel direction
}

Chan contains Type fields specific to channel types.

type ChanArgs 

type ChanArgs struct {
	T *Type // reference to a chan type whose elements need a width check
}

ChanArgs contains Type fields specific to TCHANARGS types.

type ChanDir 

type ChanDir uint8

ChanDir is whether a channel can send, receive, or both. 

const (
	// types of channel
	// must match ../../../../reflect/type.go:/ChanDir
	Crecv ChanDir = 1 << 0
	Csend ChanDir = 1 << 1
	Cboth ChanDir = Crecv | Csend
)

func (ChanDir) CanRecv 

func (c ChanDir) CanRecv() bool

func (ChanDir) CanSend 

func (c ChanDir) CanSend() bool

type Cmp 

type Cmp int8

Cmp is a comparison between values a and b. 

-1 if a < b
 0 if a == b
 1 if a > b

type EmbeddedsByName added in go1.18 

type EmbeddedsByName []*Field

EmbeddedsByName sorts embedded types by name.

func (EmbeddedsByName) Len added in go1.18 

func (x EmbeddedsByName) Len() int

func (EmbeddedsByName) Less added in go1.18 

func (x EmbeddedsByName) Less(i, j int) bool

func (EmbeddedsByName) Swap added in go1.18 

func (x EmbeddedsByName) Swap(i, j int)

type Field 

type Field struct {
	Embedded uint8 // embedded field

	Pos src.XPos

	// Name of field/method/parameter. Can be nil for interface fields embedded
	// in interfaces and unnamed parameters.
	Sym  *Sym
	Type *Type  // field type
	Note string // literal string annotation

	// For fields that represent function parameters, Nname points to the
	// associated ONAME Node. For fields that represent methods, Nname points to
	// the function name node.
	Nname Object

	// Offset in bytes of this field or method within its enclosing struct
	// or interface Type. For parameters, this is BADWIDTH.
	Offset int64
	// contains filtered or unexported fields
}

A Field is a (Sym, Type) pairing along with some other information, and, depending on the context, is used to represent:

  • a field in a struct
  • a method in an interface or associated with a named type
  • a function parameter

func FakeRecv added in go1.18 

func FakeRecv() *Field

func IncomparableField added in go1.17 

func IncomparableField(t *Type) *Field

IncomparableField returns an incomparable Field of struct Type t, if any.

func NewField 

func NewField(pos src.XPos, sym *Sym, typ *Type) *Field

func (*Field) Copy 

func (f *Field) Copy() *Field

func (*Field) End 

func (f *Field) End() int64

End returns the offset of the first byte immediately after this field.

func (*Field) IsDDD added in go1.12 

func (f *Field) IsDDD() bool

func (*Field) IsMethod added in go1.13 

func (f *Field) IsMethod() bool

IsMethod reports whether f represents a method rather than a struct field.

func (*Field) Nointerface 

func (f *Field) Nointerface() bool

func (*Field) SetIsDDD added in go1.12 

func (f *Field) SetIsDDD(b bool)

func (*Field) SetNointerface 

func (f *Field) SetNointerface(b bool)

type Forward 

type Forward struct {
	Copyto      []*Type  // where to copy the eventual value to
	Embedlineno src.XPos // first use of this type as an embedded type
}

Forward contains Type fields specific to forward types.

type Func 

type Func struct {

	// Argwid is the total width of the function receiver, params, and results.
	// It gets calculated via a temporary TFUNCARGS type.
	// Note that TFUNC's Width is Widthptr.
	Argwid int64
	// contains filtered or unexported fields
}

Func contains Type fields specific to func types.

type FuncArgs 

type FuncArgs struct {
	T *Type // reference to a func type whose elements need a width check
}

// FuncArgs contains Type fields specific to TFUNCARGS types.

type Interface 

type Interface struct {
}

Interface contains Type fields specific to interface types.

type Kind added in go1.17 

type Kind uint8

Kind describes a kind of type. 

const (
	Txxx Kind = iota

	TINT8
	TUINT8
	TINT16
	TUINT16
	TINT32
	TUINT32
	TINT64
	TUINT64
	TINT
	TUINT
	TUINTPTR

	TCOMPLEX64
	TCOMPLEX128

	TFLOAT32
	TFLOAT64

	TBOOL

	TPTR
	TFUNC
	TSLICE
	TARRAY
	TSTRUCT
	TCHAN
	TMAP
	TINTER
	TFORW
	TANY
	TSTRING
	TUNSAFEPTR

	// pseudo-types for literals
	TIDEAL // untyped numeric constants
	TNIL
	TBLANK

	// pseudo-types used temporarily only during frame layout (CalcSize())
	TFUNCARGS
	TCHANARGS

	// SSA backend types
	TSSA     // internal types used by SSA backend (flags, memory, etc.)
	TTUPLE   // a pair of types, used by SSA backend
	TRESULTS // multiple types; the result of calling a function or method, with a memory at the end.

	NTYPE
)

func (Kind) String added in go1.17 

func (i Kind) String() string

type Map 

type Map struct {
	Key  *Type // Key type
	Elem *Type // Val (elem) type

	Bucket *Type // internal struct type representing a hash bucket
}

Map contains Type fields specific to maps.

type MethodsByName added in go1.17 

type MethodsByName []*Field

MethodsByName sorts methods by name.

func (MethodsByName) Len added in go1.17 

func (x MethodsByName) Len() int

func (MethodsByName) Less added in go1.17 

func (x MethodsByName) Less(i, j int) bool

func (MethodsByName) Swap added in go1.17 

func (x MethodsByName) Swap(i, j int)

type Object added in go1.17 

type Object interface {
	Pos() src.XPos
	Sym() *Sym
	Type() *Type
}

Object represents an ir.Node, but without needing to import cmd/compile/internal/ir, which would cause an import cycle. The uses in other packages must type assert values of type Object to ir.Node or a more specific type.

type Pkg 

type Pkg struct {
	Path    string // string literal used in import statement, e.g. "runtime/internal/sys"
	Name    string // package name, e.g. "sys"
	Prefix  string // escaped path for use in symbol table
	Syms    map[string]*Sym
	Pathsym *obj.LSym

	Direct bool // imported directly
}
var BuiltinPkg *Pkg

BuiltinPkg is a fake package that declares the universe block. 

var LocalPkg *Pkg

LocalPkg is the package being compiled. 

var UnsafePkg *Pkg

UnsafePkg is package unsafe.

func NewPkg 

func NewPkg(path, name string) *Pkg

NewPkg returns a new Pkg for the given package path and name. Unless name is the empty string, if the package exists already, the existing package name and the provided name must match.

func (*Pkg) Lookup 

func (pkg *Pkg) Lookup(name string) *Sym

func (*Pkg) LookupBytes 

func (pkg *Pkg) LookupBytes(name []byte) *Sym

func (*Pkg) LookupNum added in go1.19 

func (pkg *Pkg) LookupNum(prefix string, n int) *Sym

LookupNum looks up the symbol starting with prefix and ending with the decimal n. If prefix is too long, LookupNum panics.

func (*Pkg) LookupOK 

func (pkg *Pkg) LookupOK(name string) (s *Sym, existed bool)

LookupOK looks up name in pkg and reports whether it previously existed.

func (*Pkg) Selector added in go1.22.0 

func (pkg *Pkg) Selector(name string) *Sym

Selector looks up a selector identifier.

type Ptr 

type Ptr struct {
	Elem *Type // element type
}

Ptr contains Type fields specific to pointer types.

type Results added in go1.16 

type Results struct {
	Types []*Type // Last element is memory output from call.
}

Results are the output from calls that will be late-expanded.

type Slice 

type Slice struct {
	Elem *Type // element type
}

Slice contains Type fields specific to slice types.

type Struct 

type Struct struct {

	// Maps have three associated internal structs (see struct MapType).
	// Map links such structs back to their map type.
	Map *Type

	ParamTuple bool // whether this struct is actually a tuple of signature parameters
	// contains filtered or unexported fields
}

StructType contains Type fields specific to struct types.

type Sym 

type Sym struct {
	Linkname string // link name

	Pkg  *Pkg
	Name string // object name

	// The unique ONAME, OTYPE, OPACK, or OLITERAL node that this symbol is
	// bound to within the current scope. (Most parts of the compiler should
	// prefer passing the Node directly, rather than relying on this field.)
	//
	// Deprecated: New code should avoid depending on Sym.Def. Add
	// mdempsky@ as a reviewer for any CLs involving Sym.Def.
	Def Object
	// contains filtered or unexported fields
}

Sym represents an object name in a segmented (pkg, name) namespace. Most commonly, this is a Go identifier naming an object declared within a package, but Syms are also used to name internal synthesized objects.

As an exception, field and method names that are exported use the Sym associated with localpkg instead of the package that declared them. This allows using Sym pointer equality to test for Go identifier uniqueness when handling selector expressions.

Ideally, Sym should be used for representing Go language constructs, while cmd/internal/obj.LSym is used for representing emitted artifacts.

NOTE: In practice, things can be messier than the description above for various reasons (historical, convenience). 

var BlankSym *Sym

BlankSym is the blank (_) symbol.

func TypeSym added in go1.17 

func TypeSym(t *Type) *Sym

func TypeSymLookup added in go1.17 

func TypeSymLookup(name string) *Sym

func (*Sym) Asm 

func (sym *Sym) Asm() bool

func (*Sym) Format 

func (s *Sym) Format(f fmt.State, verb rune)

Format implements formatting for a Sym. The valid formats are: 

%v	Go syntax: Name for symbols in the local package, PkgName.Name for imported symbols.
%+v	Debug syntax: always include PkgName. prefix even for local names.
%S	Short syntax: Name only, no matter what.

func (*Sym) Func added in go1.12 

func (sym *Sym) Func() bool

func (*Sym) IsBlank 

func (sym *Sym) IsBlank() bool

func (*Sym) Less added in go1.11 

func (a *Sym) Less(b *Sym) bool

Less reports whether symbol a is ordered before symbol b.

Symbols are ordered exported before non-exported, then by name, and finally (for non-exported symbols) by package path.

func (*Sym) Linksym deprecated 

func (sym *Sym) Linksym() *obj.LSym

Deprecated: This method should not be used directly. Instead, use a higher-level abstraction that directly returns the linker symbol for a named object. For example, reflectdata.TypeLinksym(t) instead of reflectdata.TypeSym(t).Linksym().

func (*Sym) LinksymABI deprecated added in go1.17 

func (sym *Sym) LinksymABI(abi obj.ABI) *obj.LSym

Deprecated: This method should not be used directly. Instead, use a higher-level abstraction that directly returns the linker symbol for a named object. For example, (*ir.Name).LinksymABI(abi) instead of (*ir.Name).Sym().LinksymABI(abi).

func (*Sym) OnExportList added in go1.11 

func (sym *Sym) OnExportList() bool

func (*Sym) SetAsm 

func (sym *Sym) SetAsm(b bool)

func (*Sym) SetFunc added in go1.12 

func (sym *Sym) SetFunc(b bool)

func (*Sym) SetOnExportList added in go1.11 

func (sym *Sym) SetOnExportList(b bool)

func (*Sym) SetSiggen 

func (sym *Sym) SetSiggen(b bool)

func (*Sym) SetUniq 

func (sym *Sym) SetUniq(b bool)

func (*Sym) Siggen 

func (sym *Sym) Siggen() bool

func (*Sym) String 

func (s *Sym) String() string

func (*Sym) Uniq 

func (sym *Sym) Uniq() bool

type Tuple 

type Tuple struct {
	// contains filtered or unexported fields
}

type Type 

type Type struct {
	// contains filtered or unexported fields
}

A Type represents a Go type.

There may be multiple unnamed types with identical structure. However, there must be a unique Type object for each unique named (defined) type. After noding, a package-level type can be looked up by building its unique symbol sym (sym = package.Lookup(name)) and checking sym.Def. If sym.Def is non-nil, the type already exists at package scope and is available at sym.Def.(*ir.Name).Type(). Local types (which may have the same name as a package-level type) are distinguished by their vargen, which is embedded in their symbol name.

func ComplexForFloat added in go1.17 

func ComplexForFloat(t *Type) *Type

func FakeRecvType 

func FakeRecvType() *Type

FakeRecvType returns the singleton type used for interface method receivers.

func FloatForComplex added in go1.17 

func FloatForComplex(t *Type) *Type

func NewArray 

func NewArray(elem *Type, bound int64) *Type

NewArray returns a new fixed-length array Type.

func NewChan 

func NewChan(elem *Type, dir ChanDir) *Type

NewChan returns a new chan Type with direction dir.

func NewChanArgs 

func NewChanArgs(c *Type) *Type

NewChanArgs returns a new TCHANARGS type for channel type c.

func NewFuncArgs 

func NewFuncArgs(f *Type) *Type

NewFuncArgs returns a new TFUNCARGS type for func type f.

func NewInterface added in go1.17 

func NewInterface(methods []*Field) *Type

NewInterface returns a new interface for the given methods and embedded types. Embedded types are specified as fields with no Sym.

func NewMap 

func NewMap(k, v *Type) *Type

NewMap returns a new map Type with key type k and element (aka value) type v.

func NewNamed added in go1.17 

func NewNamed(obj Object) *Type

NewNamed returns a new named type for the given type name. obj should be an ir.Name. The new type is incomplete (marked as TFORW kind), and the underlying type should be set later via SetUnderlying(). References to the type are maintained until the type is filled in, so those references can be updated when the type is complete.

func NewPtr 

func NewPtr(elem *Type) *Type

NewPtr returns the pointer type pointing to t.

func NewResults added in go1.16 

func NewResults(types []*Type) *Type

func NewSignature added in go1.17 

func NewSignature(recv *Field, params, results []*Field) *Type

NewSignature returns a new function type for the given receiver, parameters, and results, any of which may be nil.

func NewSlice 

func NewSlice(elem *Type) *Type

NewSlice returns the slice Type with element type elem.

func NewStruct added in go1.17 

func NewStruct(fields []*Field) *Type

NewStruct returns a new struct with the given fields.

func NewTuple 

func NewTuple(t1, t2 *Type) *Type

func ReceiverBaseType added in go1.17 

func ReceiverBaseType(t *Type) *Type

ReceiverBaseType returns the underlying type, if any, that owns methods with receiver parameter t. The result is either a named type or an anonymous struct.

func SubstAny 

func SubstAny(t *Type, types *[]*Type) *Type

SubstAny walks t, replacing instances of "any" with successive elements removed from types. It returns the substituted type.

func (*Type) Alignment 

func (t *Type) Alignment() int64

func (*Type) AllMethods 

func (t *Type) AllMethods() []*Field

AllMethods returns a pointer to all the methods (including embedding) for type t. For an interface type, this is the set of methods that are typically iterated over. For non-interface types, AllMethods() only returns a valid result after CalcMethods() has been called at least once.

func (*Type) ArgWidth 

func (t *Type) ArgWidth() int64

ArgWidth returns the total aligned argument size for a function. It includes the receiver, parameters, and results.

func (*Type) CanBeAnSSAAux added in go1.17 

func (*Type) CanBeAnSSAAux()

func (*Type) ChanArgs 

func (t *Type) ChanArgs() *Type

ChanArgs returns the channel type for TCHANARGS type t.

func (*Type) ChanDir 

func (t *Type) ChanDir() ChanDir

ChanDir returns the direction of a channel type t. The direction will be one of Crecv, Csend, or Cboth.

func (*Type) Compare 

func (t *Type) Compare(x *Type) Cmp

Compare compares types for purposes of the SSA back end, returning a Cmp (one of CMPlt, CMPeq, CMPgt). The answers are correct for an optimizer or code generator, but not necessarily typechecking. The order chosen is arbitrary, only consistency and division into equivalence classes (Types that compare CMPeq) matters.

func (*Type) Deferwidth 

func (t *Type) Deferwidth() bool

func (*Type) Elem 

func (t *Type) Elem() *Type

Elem returns the type of elements of t. Usable with pointers, channels, arrays, slices, and maps.

func (*Type) Field 

func (t *Type) Field(i int) *Field

Field returns the i'th field of struct type t.

func (*Type) FieldName 

func (t *Type) FieldName(i int) string

func (*Type) FieldOff 

func (t *Type) FieldOff(i int) int64

func (*Type) FieldType 

func (t *Type) FieldType(i int) *Type

func (*Type) Fields 

func (t *Type) Fields() []*Field

Fields returns a slice of containing all fields of a struct type t.

func (*Type) Format 

func (t *Type) Format(s fmt.State, verb rune)

Format implements formatting for a Type. The valid formats are: 

%v	Go syntax
%+v	Debug syntax: Go syntax with a KIND- prefix for all but builtins.
%L	Go syntax for underlying type if t is named
%S	short Go syntax: drop leading "func" in function type
%-S	special case for method receiver symbol

func (*Type) FuncArgs 

func (t *Type) FuncArgs() *Type

FuncArgs returns the func type for TFUNCARGS type t.

func (*Type) HasNil added in go1.14 

func (t *Type) HasNil() bool

HasNil reports whether the set of values determined by t includes nil.

func (*Type) HasPointers added in go1.15.3 

func (t *Type) HasPointers() bool

HasPointers reports whether t contains a heap pointer. Note that this function ignores pointers to not-in-heap types.

func (*Type) HasShape added in go1.18 

func (t *Type) HasShape() bool

func (*Type) IsArray 

func (t *Type) IsArray() bool

func (*Type) IsBoolean 

func (t *Type) IsBoolean() bool

func (*Type) IsChan 

func (t *Type) IsChan() bool

func (*Type) IsComplex 

func (t *Type) IsComplex() bool

func (*Type) IsEmptyInterface 

func (t *Type) IsEmptyInterface() bool

IsEmptyInterface reports whether t is an empty interface type.

func (*Type) IsFlags 

func (t *Type) IsFlags() bool

func (*Type) IsFloat 

func (t *Type) IsFloat() bool

func (*Type) IsFullyInstantiated added in go1.18 

func (t *Type) IsFullyInstantiated() bool

IsFullyInstantiated reports whether t is a fully instantiated generic type; i.e. an instantiated generic type where all type arguments are non-generic or fully instantiated generic types.

func (*Type) IsFuncArgStruct 

func (t *Type) IsFuncArgStruct() bool

IsFuncArgStruct reports whether t is a struct representing function parameters or results.

func (*Type) IsInteger 

func (t *Type) IsInteger() bool

func (*Type) IsInterface 

func (t *Type) IsInterface() bool

func (*Type) IsKind 

func (t *Type) IsKind(et Kind) bool

IsKind reports whether t is a Type of the specified kind.

func (*Type) IsMap 

func (t *Type) IsMap() bool

func (*Type) IsMemory 

func (t *Type) IsMemory() bool

func (*Type) IsPtr 

func (t *Type) IsPtr() bool

IsPtr reports whether t is a regular Go pointer type. This does not include unsafe.Pointer.

func (*Type) IsPtrElem added in go1.12 

func (t *Type) IsPtrElem() bool

IsPtrElem reports whether t is the element of a pointer (to t).

func (*Type) IsPtrShaped 

func (t *Type) IsPtrShaped() bool

IsPtrShaped reports whether t is represented by a single machine pointer. In addition to regular Go pointer types, this includes map, channel, and function types and unsafe.Pointer. It does not include array or struct types that consist of a single pointer shaped type. TODO(mdempsky): Should it? See golang.org/issue/15028.

func (*Type) IsResults added in go1.16 

func (t *Type) IsResults() bool

func (*Type) IsScalar added in go1.17 

func (t *Type) IsScalar() bool

IsScalar reports whether 't' is a scalar Go type, e.g. bool/int/float/complex. Note that struct and array types consisting of a single scalar element are not considered scalar, likewise pointer types are also not considered scalar.

func (*Type) IsShape added in go1.18 

func (t *Type) IsShape() bool

func (*Type) IsSigned 

func (t *Type) IsSigned() bool

func (*Type) IsSlice 

func (t *Type) IsSlice() bool

func (*Type) IsString 

func (t *Type) IsString() bool

func (*Type) IsStruct 

func (t *Type) IsStruct() bool

func (*Type) IsTuple 

func (t *Type) IsTuple() bool

func (*Type) IsUintptr added in go1.16 

func (t *Type) IsUintptr() bool

IsUintptr reports whether t is a uintptr.

func (*Type) IsUnsafePtr 

func (t *Type) IsUnsafePtr() bool

IsUnsafePtr reports whether t is an unsafe pointer.

func (*Type) IsUnsigned added in go1.17 

func (t *Type) IsUnsigned() bool

func (*Type) IsUntyped 

func (t *Type) IsUntyped() bool

IsUntyped reports whether t is an untyped type.

func (*Type) IsVariadic added in go1.11 

func (t *Type) IsVariadic() bool

IsVariadic reports whether function type t is variadic.

func (*Type) IsVoid 

func (t *Type) IsVoid() bool

func (*Type) Key 

func (t *Type) Key() *Type

Key returns the key type of map type t.

func (*Type) Kind added in go1.17 

func (t *Type) Kind() Kind

Kind returns the kind of type t.

func (*Type) LinkString added in go1.18 

func (t *Type) LinkString() string

LinkString returns a string description of t, suitable for use in link symbols.

The description corresponds to type identity. That is, for any pair of types t1 and t2, Identical(t1, t2) == (t1.LinkString() == t2.LinkString()) is true. Thus it's safe to use as a map key to implement a type-identity-keyed map.

func (*Type) MapType 

func (t *Type) MapType() *Map

MapType returns t's extra map-specific fields.

func (*Type) Methods 

func (t *Type) Methods() []*Field

Methods returns a pointer to the base methods (excluding embedding) for type t. These can either be concrete methods (for non-interface types) or interface methods (for interface types).

func (*Type) NameString added in go1.18 

func (t *Type) NameString() string

NameString generates a user-readable, mostly unique string description of t. NameString always returns the same description for identical types, even across compilation units.

NameString qualifies identifiers by package name, so it has collisions when different packages share the same names and identifiers. It also does not distinguish function-scope defined types from package-scoped defined types or from each other.

func (*Type) Noalg 

func (t *Type) Noalg() bool

func (*Type) NotInHeap 

func (t *Type) NotInHeap() bool

func (*Type) NumComponents added in go1.10 

func (t *Type) NumComponents(countBlank componentsIncludeBlankFields) int64

NumComponents returns the number of primitive elements that compose t. Struct and array types are flattened for the purpose of counting. All other types (including string, slice, and interface types) count as one element. If countBlank is IgnoreBlankFields, then blank struct fields (and their comprised elements) are excluded from the count. struct { x, y [3]int } has six components; [10]struct{ x, y string } has twenty.

func (*Type) NumElem 

func (t *Type) NumElem() int64

func (*Type) NumFields 

func (t *Type) NumFields() int

func (*Type) NumParams added in go1.10 

func (t *Type) NumParams() int

func (*Type) NumRecvs added in go1.10 

func (t *Type) NumRecvs() int

func (*Type) NumResults added in go1.10 

func (t *Type) NumResults() int

func (*Type) Obj added in go1.17 

func (t *Type) Obj() Object

Obj returns the canonical type name node for a named type t, nil for an unnamed type.

func (*Type) OffsetOf added in go1.22.0 

func (t *Type) OffsetOf(name string) int64

OffsetOf reports the offset of the field of a struct. The field is looked up by name.

func (*Type) Param added in go1.22.0 

func (t *Type) Param(i int) *Field

Param returns the i'th parameter of signature type t.

func (*Type) Params 

func (t *Type) Params() []*Field

Params returns a slice of regular parameters of signature type t.

func (*Type) ParamsResults added in go1.22.0 

func (t *Type) ParamsResults() []*Field

ParamsResults returns a slice containing the signature's (normal) parameters followed by its results.

func (*Type) Pos added in go1.17 

func (t *Type) Pos() src.XPos

Pos returns a position associated with t, if any. This should only be used for diagnostics.

func (*Type) PtrTo 

func (t *Type) PtrTo() *Type

func (*Type) RParams added in go1.17 

func (t *Type) RParams() []*Type

func (*Type) Recur 

func (t *Type) Recur() bool

func (*Type) Recv 

func (t *Type) Recv() *Field

Recv returns the receiver of function type t, if any.

func (*Type) RecvParams added in go1.22.0 

func (t *Type) RecvParams() []*Field

RecvParams returns a slice containing the signature's receiver (if any) followed by its (normal) parameters.

func (*Type) RecvParamsResults added in go1.22.0 

func (t *Type) RecvParamsResults() []*Field

RecvsParamsResults returns a slice containing all of the signature's parameters in receiver (if any), (normal) parameters, and then results.

func (*Type) Recvs 

func (t *Type) Recvs() []*Field

Recvs returns a slice of receiver parameters of signature type t. The returned slice always has length 0 or 1.

func (*Type) Registers added in go1.22.0 

func (t *Type) Registers() (uint8, uint8)

Registers returns the number of integer and floating-point registers required to represent a parameter of this type under the ABIInternal calling conventions.

If t must be passed by memory, Registers returns (math.MaxUint8, math.MaxUint8).

func (*Type) Result added in go1.22.0 

func (t *Type) Result(i int) *Field

Result returns the i'th result of signature type t.

func (*Type) Results 

func (t *Type) Results() []*Field

Results returns a slice of result parameters of signature type t.

func (*Type) ResultsTuple added in go1.22.0 

func (t *Type) ResultsTuple() *Type

ResultTuple returns the result type of signature type t as a tuple. This can be used as the type of multi-valued call expressions.

func (*Type) SetAllMethods added in go1.17 

func (t *Type) SetAllMethods(fs []*Field)

SetAllMethods sets the set of all methods for type t (i.e., including promoted methods from embedded types).

func (*Type) SetDeferwidth 

func (t *Type) SetDeferwidth(b bool)

func (*Type) SetHasShape added in go1.18 

func (t *Type) SetHasShape(b bool)

func (*Type) SetInterface 

func (t *Type) SetInterface(methods []*Field)

SetInterface sets the base methods of an interface type t.

func (*Type) SetIsShape added in go1.18 

func (t *Type) SetIsShape(b bool)

Should always do SetHasShape(true) when doing SetIsShape(true).

func (*Type) SetMethods added in go1.22.0 

func (t *Type) SetMethods(fs []*Field)

SetMethods sets the direct method set for type t (i.e., *not* including promoted methods from embedded types).

func (*Type) SetNoalg 

func (t *Type) SetNoalg(b bool)

func (*Type) SetNotInHeap 

func (t *Type) SetNotInHeap(b bool)

func (*Type) SetRParams added in go1.17 

func (t *Type) SetRParams(rparams []*Type)

func (*Type) SetRecur 

func (t *Type) SetRecur(b bool)

func (*Type) SetUnderlying added in go1.17 

func (t *Type) SetUnderlying(underlying *Type)

SetUnderlying sets the underlying type of an incomplete type (i.e. type whose kind is currently TFORW). SetUnderlying automatically updates any types that were waiting for this type to be completed.

func (*Type) SimpleString 

func (t *Type) SimpleString() string

func (*Type) Size 

func (t *Type) Size() int64

func (*Type) SoleComponent added in go1.13 

func (t *Type) SoleComponent() *Type

SoleComponent returns the only primitive component in t, if there is exactly one. Otherwise, it returns nil. Components are counted as in NumComponents, including blank fields. Keep in sync with cmd/compile/internal/walk/convert.go:soleComponent.

func (*Type) String 

func (t *Type) String() string

String returns the Go syntax for the type t.

func (*Type) StructType 

func (t *Type) StructType() *Struct

StructType returns t's extra struct-specific fields.

func (*Type) Sym 

func (t *Type) Sym() *Sym

Sym returns the name of type t.

func (*Type) ToUnsigned 

func (t *Type) ToUnsigned() *Type

ToUnsigned returns the unsigned equivalent of integer type t.

func (*Type) Underlying added in go1.17 

func (t *Type) Underlying() *Type

Underlying returns the underlying type of type t.

Source Files

View all Source files

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.