types

package
v0.0.0-...-16768cb Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Nov 17, 2017 License: BSD-3-Clause Imports: 6 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	Txxx = iota

	TINT8
	TUINT8
	TINT16
	TUINT16
	TINT32
	TUINT32
	TINT64
	TUINT64
	TINT
	TUINT
	TUINTPTR

	TCOMPLEX64
	TCOMPLEX128

	TFLOAT32
	TFLOAT64

	TBOOL

	TPTR32
	TPTR64

	TFUNC
	TSLICE
	TARRAY
	TSTRUCT
	TCHAN
	TMAP
	TINTER
	TFORW
	TANY
	TSTRING
	TUNSAFEPTR

	// pseudo-types for literals
	TIDEAL
	TNIL
	TBLANK

	// pseudo-types for frame layout
	TFUNCARGS
	TCHANARGS

	// pseudo-types for import/export
	TDDDFIELD // wrapper: contained type is a ... field

	// SSA backend types
	TSSA   // internal types used by SSA backend (flags, memory, etc.)
	TTUPLE // a pair of types, used by SSA backend

	NTYPE
)
View Source 
const (
	CMPlt = Cmp(-1)
	CMPeq = Cmp(0)
	CMPgt = Cmp(1)
)
View Source 
const BADWIDTH = -1000000000

Variables

View Source 
var (
	// Predeclared alias types. Kept separate for better error messages.
	Bytetype *Type
	Runetype *Type

	// Predeclared error interface type.
	Errortype *Type

	// Types to represent untyped string and boolean constants.
	Idealstring *Type
	Idealbool   *Type

	// Types to represent untyped numeric constants.
	// Note: Currently these are only used within the binary export
	// data format. The rest of the compiler only uses Types[TIDEAL].
	Idealint     = New(TIDEAL)
	Idealrune    = New(TIDEAL)
	Idealfloat   = New(TIDEAL)
	Idealcomplex = New(TIDEAL)
)
View Source 
var (
	Widthptr    int
	Dowidth     func(*Type)
	Fatalf      func(string, ...interface{})
	Sconv       func(*Sym, int, int) string       // orig: func sconv(s *Sym, flag FmtFlag, mode fmtMode) string
	Tconv       func(*Type, int, int, int) string // orig: func tconv(t *Type, flag FmtFlag, mode fmtMode, depth int) string
	FormatSym   func(*Sym, fmt.State, rune, int)  // orig: func symFormat(sym *Sym, s fmt.State, verb rune, mode fmtMode)
	FormatType  func(*Type, fmt.State, rune, int) // orig: func typeFormat(t *Type, s fmt.State, verb rune, mode fmtMode)
	TypeLinkSym func(*Type) *obj.LSym
	Ctxt        *obj.Link

	FmtLeft     int
	FmtUnsigned int
	FErr        int
)

The following variables must be initialized early by the frontend. They are here to break import cycles. TODO(gri) eliminate these dependencies.

View Source 
var Block int32 // current block number
View Source 
var InitSyms []*Sym
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 ParamsResults = [2]func(*Type) *Type{
	(*Type).Params, (*Type).Results,
}

ParamsResults is like RecvsParamsResults, but omits receiver parameters.

View Source 
var RecvsParamsResults = [3]func(*Type) *Type{
	(*Type).Recvs, (*Type).Params, (*Type).Results,
}

RecvsParamsResults stores the accessor functions for a function Type's receiver, parameters, and result parameters, in that order. It can be used to iterate over all of a function's parameter lists.

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[TIDEAL] represents untyped numeric constants.
  • Types[TNIL] represents the predeclared "nil" value's type.
  • Types[TUNSAFEPTR] is package unsafe's Pointer type.

Functions

func CleanroomDo 

func CleanroomDo(f func())

CleanroomDo invokes f in an environment with with no preexisting packages. For testing of import/export only.

func Haspointers 

func Haspointers(t *Type) bool

func InternString 

func InternString(b []byte) string

func IsDclstackValid 

func IsDclstackValid() bool

func Markdcl 

func Markdcl()

Markdcl records the start of a new block scope for declarations.

func Popdcl 

func Popdcl()

Popdcl pops the innermost block scope and restores all symbol declarations to their previous state.

func Pushdcl 

func Pushdcl(s *Sym)

Pushdcl pushes the current declaration for symbol s (if any) so that it can be shadowed by a new declaration within a nested block scope.

Types

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 DDDField 

type DDDField struct {
	T *Type // reference to a slice type for ... args
}

DDDField contains Type fields specific to TDDDFIELD types.

type EType 

type EType uint8

EType describes a kind of type. 

var Tptr EType // either TPTR32 or TPTR64

Initialized by frontend. Exists only here.

func (EType) String 

func (et EType) String() string

type Field 

type Field struct {
	Embedded uint8 // embedded field
	Funarg   Funarg

	Sym   *Sym
	Nname *Node

	Type *Type // field type

	// Offset in bytes of this field or method within its enclosing struct
	// or interface Type.
	Offset int64

	Note string // literal string annotation
	// contains filtered or unexported fields
}

A Field represents a field in a struct or a method in an interface or associated with a named type.

func NewField 

func NewField() *Field

func (*Field) Broke 

func (f *Field) Broke() bool

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 

func (f *Field) Isddd() bool

func (*Field) Nointerface 

func (f *Field) Nointerface() bool

func (*Field) SetBroke 

func (f *Field) SetBroke(b bool)

func (*Field) SetIsddd 

func (f *Field) SetIsddd(b bool)

func (*Field) SetNointerface 

func (f *Field) SetNointerface(b bool)

type Fields 

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

Fields is a pointer to a slice of *Field. This saves space in Types that do not have fields or methods compared to a simple slice of *Field.

func (*Fields) Append 

func (f *Fields) Append(s ...*Field)

Append appends entries to f.

func (*Fields) Index 

func (f *Fields) Index(i int) *Field

Index returns the i'th element of Fields. It panics if f does not have at least i+1 elements.

func (*Fields) Len 

func (f *Fields) Len() int

Len returns the number of entries in f.

func (*Fields) Set 

func (f *Fields) Set(s []*Field)

Set sets f to a slice. This takes ownership of the slice.

func (*Fields) Slice 

func (f *Fields) Slice() []*Field

Slice returns the entries in f as a slice. Changes to the slice entries will be reflected in f.

type Forward 

type Forward struct {
	Copyto      []*Node  // 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 Funarg 

type Funarg uint8

Fnstruct records the kind of function argument 

const (
	FunargNone    Funarg = iota
	FunargRcvr           // receiver
	FunargParams         // input parameters
	FunargResults        // output results
)

type Func 

type Func struct {
	Receiver *Type // function receiver
	Results  *Type // function results
	Params   *Type // function params

	Nname *Node

	// 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

	Outnamed bool
}

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 {
	Fields Fields
}

Interface contains Type fields specific to interface types.

type Map 

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

	Bucket *Type // internal struct type representing a hash bucket
	Hmap   *Type // internal struct type representing the Hmap (map header object)
	Hiter  *Type // internal struct type representing hash iterator state
}

Map contains Type fields specific to maps.

type Node 

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

Dummy Node so we can refer to *Node without actually having a gc.Node. Necessary to break import cycles. TODO(gri) try to eliminate soon

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"
	Pathsym  *obj.LSym
	Prefix   string // escaped path for use in symbol table
	Imported bool   // export data of this package was parsed
	Direct   bool   // imported directly
	Syms     map[string]*Sym
}

func ImportedPkgList 

func ImportedPkgList() []*Pkg

ImportedPkgList returns the list of directly imported packages. The list is sorted by package path.

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) LookupOK 

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

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

type Ptr 

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

Ptr contains Type fields specific to pointer types.

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

	Funarg Funarg // type of function arguments for arg struct
	// contains filtered or unexported fields
}

StructType contains Type fields specific to struct types.

type Sym 

type Sym struct {
	Importdef *Pkg   // where imported definition was found
	Linkname  string // link name

	// saved and restored by dcopy
	Pkg        *Pkg
	Name       string   // object name
	Def        *Node    // definition: ONAME OTYPE OPACK or OLITERAL
	Block      int32    // blocknumber to catch redeclaration
	Lastlineno src.XPos // last declaration for diagnostic

	Label   *Node // corresponding label (ephemeral)
	Origpkg *Pkg  // original package for . import
	// contains filtered or unexported fields
}

Sym represents an object name. 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.

func (*Sym) AlgGen 

func (sym *Sym) AlgGen() bool

func (*Sym) Asm 

func (sym *Sym) Asm() bool

func (*Sym) Export 

func (sym *Sym) Export() bool

func (*Sym) Exported 

func (sym *Sym) Exported() bool

func (*Sym) Format 

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

func (*Sym) IsBlank 

func (sym *Sym) IsBlank() bool

func (*Sym) Linksym 

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

func (*Sym) LinksymName 

func (sym *Sym) LinksymName() string

func (*Sym) Package 

func (sym *Sym) Package() bool

func (*Sym) SetAlgGen 

func (sym *Sym) SetAlgGen(b bool)

func (*Sym) SetAsm 

func (sym *Sym) SetAsm(b bool)

func (*Sym) SetExport 

func (sym *Sym) SetExport(b bool)

func (*Sym) SetExported 

func (sym *Sym) SetExported(b bool)

func (*Sym) SetPackage 

func (sym *Sym) SetPackage(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 {
	// Extra contains extra etype-specific fields.
	// As an optimization, those etype-specific structs which contain exactly
	// one pointer-shaped field are stored as values rather than pointers when possible.
	//
	// TMAP: *Map
	// TFORW: *Forward
	// TFUNC: *Func
	// TSTRUCT: *Struct
	// TINTER: *Inter
	// TDDDFIELD: DDDField
	// TFUNCARGS: FuncArgs
	// TCHANARGS: ChanArgs
	// TCHAN: *Chan
	// TPTR32, TPTR64: Ptr
	// TARRAY: *Array
	// TSLICE: Slice
	Extra interface{}

	// Width is the width of this Type in bytes.
	Width int64

	Nod  *Node // canonical OTYPE node
	Orig *Type // original type (type literal or predefined type)

	SliceOf *Type
	PtrBase *Type

	Sym    *Sym  // symbol containing name, for named types
	Vargen int32 // unique name for OTYPE/ONAME

	Etype EType // kind of type
	Align uint8 // the required alignment of this type, in bytes
	// contains filtered or unexported fields
}

A Type represents a Go type. 

var (
	TypeInvalid *Type = newSSA("invalid")
	TypeMem     *Type = newSSA("mem")
	TypeFlags   *Type = newSSA("flags")
	TypeVoid    *Type = newSSA("void")
	TypeInt128  *Type = newSSA("int128")
)

func FakeRecvType 

func FakeRecvType() *Type

FakeRecvType returns the singleton type used for interface method receivers.

func New 

func New(et EType) *Type

New returns a new Type of the specified kind.

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 NewDDDArray 

func NewDDDArray(elem *Type) *Type

NewDDDArray returns a new [...]T array Type.

func NewDDDField 

func NewDDDField(s *Type) *Type

NewDDDField returns a new TDDDFIELD type for slice type s.

func NewFuncArgs 

func NewFuncArgs(f *Type) *Type

NewFuncArgs returns a new TFUNCARGS type for func type f.

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 NewPtr 

func NewPtr(elem *Type) *Type

NewPtr returns the pointer type pointing to t.

func NewSlice 

func NewSlice(elem *Type) *Type

NewSlice returns the slice Type with element type elem.

func NewTuple 

func NewTuple(t1, t2 *Type) *Type

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() *Fields

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) Broke 

func (t *Type) Broke() bool

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) ChanType 

func (t *Type) ChanType() *Chan

ChanType returns t's extra channel-specific fields.

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) Copy 

func (t *Type) Copy() *Type

Copy returns a shallow copy of the Type.

func (*Type) DDDField 

func (t *Type) DDDField() *Type

DDDField returns the slice ... type for TDDDFIELD type t.

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, and slices.

func (*Type) ElemType 

func (t *Type) ElemType() *Type

func (*Type) Field 

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

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

func (*Type) FieldName 

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

func (*Type) FieldOff 

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

func (*Type) FieldSlice 

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

FieldSlice returns a slice of containing all fields/methods of struct/interface type t.

func (*Type) FieldType 

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

func (*Type) Fields 

func (t *Type) Fields() *Fields

func (*Type) Format 

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

func (*Type) ForwardType 

func (t *Type) ForwardType() *Forward

ForwardType returns t's extra forward-type-specific fields.

func (*Type) FuncArgs 

func (t *Type) FuncArgs() *Type

FuncArgs returns the channel type for TFUNCARGS type t.

func (*Type) FuncType 

func (t *Type) FuncType() *Func

FuncType returns t's extra func-specific fields.

func (*Type) HasPointer 

func (t *Type) HasPointer() bool

HasPointer returns whether t contains heap pointer. This is used for write barrier insertion, so we ignore pointers to go:notinheap types.

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) IsDDDArray 

func (t *Type) IsDDDArray() 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) IsFuncArgStruct 

func (t *Type) IsFuncArgStruct() bool

IsFuncArgStruct reports whether t is a struct representing function parameters.

func (*Type) IsInteger 

func (t *Type) IsInteger() bool

func (*Type) IsInterface 

func (t *Type) IsInterface() bool

func (*Type) IsKind 

func (t *Type) IsKind(et EType) 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) 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) 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) IsUnsafePtr 

func (t *Type) IsUnsafePtr() bool

IsUnsafePtr reports whether t is an unsafe pointer.

func (*Type) IsUntyped 

func (t *Type) IsUntyped() bool

IsUntyped reports whether t is an untyped type.

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) Local 

func (t *Type) Local() bool

func (*Type) LongString 

func (t *Type) LongString() string

LongString generates a complete description of t. It is useful for reflection, or when a unique fingerprint or hash of a type is required.

func (*Type) MapType 

func (t *Type) MapType() *Map

MapType returns t's extra map-specific fields.

func (*Type) Methods 

func (t *Type) Methods() *Fields

func (*Type) Nname 

func (t *Type) Nname() *Node

Nname returns the associated function's nname.

func (*Type) Noalg 

func (t *Type) Noalg() bool

func (*Type) NotInHeap 

func (t *Type) NotInHeap() bool

func (*Type) NumElem 

func (t *Type) NumElem() int64

func (*Type) NumFields 

func (t *Type) NumFields() int

func (*Type) Params 

func (t *Type) Params() *Type

func (*Type) PtrTo 

func (t *Type) PtrTo() *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) Recvs 

func (t *Type) Recvs() *Type

func (*Type) Results 

func (t *Type) Results() *Type

func (*Type) SetBroke 

func (t *Type) SetBroke(b bool)

func (*Type) SetDeferwidth 

func (t *Type) SetDeferwidth(b bool)

func (*Type) SetFields 

func (t *Type) SetFields(fields []*Field)

SetFields sets struct/interface type t's fields/methods to fields.

func (*Type) SetInterface 

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

func (*Type) SetLocal 

func (t *Type) SetLocal(b bool)

func (*Type) SetNname 

func (t *Type) SetNname(n *Node)

Nname sets the associated function's nname.

func (*Type) SetNoalg 

func (t *Type) SetNoalg(b bool)

func (*Type) SetNotInHeap 

func (t *Type) SetNotInHeap(b bool)

func (*Type) SetNumElem 

func (t *Type) SetNumElem(n int64)

SetNumElem sets the number of elements in an array type. The only allowed use is on array types created with NewDDDArray. For other uses, create a new array with NewArray instead.

func (*Type) SetRecur 

func (t *Type) SetRecur(b bool)

func (*Type) ShortString 

func (t *Type) ShortString() string

ShortString generates a short description of t. It is used in autogenerated method names, reflection, and itab names.

func (*Type) SimpleString 

func (t *Type) SimpleString() string

func (*Type) Size 

func (t *Type) Size() int64

func (*Type) String 

func (t *Type) String() string

func (*Type) StructType 

func (t *Type) StructType() *Struct

StructType returns t's extra struct-specific fields.

func (*Type) Symbol 

func (t *Type) Symbol() *obj.LSym

func (*Type) Tie 

func (t *Type) Tie() byte

Tie returns 'T' if t is a concrete type, 'I' if t is an interface type, and 'E' if t is an empty interface type. It is used to build calls to the conv* and assert* runtime routines.

func (*Type) ToUnsigned 

func (t *Type) ToUnsigned() *Type

ToUnsigned returns the unsigned equivalent of integer type t.

func (*Type) Val 

func (t *Type) Val() *Type

Val returns the value type of map type t.

func (*Type) WidthCalculated 

func (t *Type) WidthCalculated() bool

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