gc

package standard library
go1.13.2 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Oct 17, 2019 License: BSD-3-Clause Imports: 46 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	H0 = 2166136261
	Hp = 16777619
)

FNV-1 hash function constants.

View Source 
const (
	EscFuncUnknown = 0 + iota
	EscFuncPlanned
	EscFuncStarted
	EscFuncTagged
)
View Source 
const (
	EscUnknown        = iota
	EscNone           // Does not escape to heap, result, or parameters.
	EscReturn         // Is returned or reachable from returned.
	EscHeap           // Reachable from the heap
	EscNever          // By construction will not escape.
	EscBits           = 3
	EscMask           = (1 << EscBits) - 1
	EscContentEscapes = 1 << EscBits // value obtained by indirect of parameter escapes to heap
	EscReturnBits     = EscBits + 1
)

Escape constants are numbered in order of increasing "escapiness" to help make inferences be monotonic. With the exception of EscNever which is sticky, eX < eY means that eY is more exposed than eX, and hence replaces it in a conservative analysis.

View Source 
const (
	FErr = iota
	FDbg
	FTypeId
	FTypeIdName // same as FTypeId, but use package name instead of prefix
)

*types.Sym, *types.Type, and *Node types use the flags below to set the format mode

View Source 
const (
	InitNotStarted = iota
	InitDone
	InitPending
)

Static initialization phase. These values are stored in two bits in Node.flags.

View Source 
const (
	// Func pragmas.
	Nointerface    syntax.Pragma = 1 << iota
	Noescape                     // func parameters don't escape
	Norace                       // func must not have race detector annotations
	Nosplit                      // func should not execute on separate stack
	Noinline                     // func should not be inlined
	CgoUnsafeArgs                // treat a pointer to one arg as a pointer to them all
	UintptrEscapes               // pointers converted to uintptr escape

	// Runtime-only func pragmas.
	// See ../../../../runtime/README.md for detailed descriptions.
	Systemstack        // func must run on system stack
	Nowritebarrier     // emit compiler error instead of write barrier
	Nowritebarrierrec  // error on write barrier in this or recursive callees
	Yeswritebarrierrec // cancels Nowritebarrierrec in this function and callees

	// Runtime-only type pragmas
	NotInHeap // values of this type must not be heap allocated
)
View Source 
const (
	// Maximum size in bits for Mpints before signalling
	// overflow and also mantissa precision for Mpflts.
	Mpprec = 512
	// Turn on for constant arithmetic debugging output.
	Mpdebug = false
)
View Source 
const (
	BUCKETSIZE  = 8
	MAXKEYSIZE  = 128
	MAXELEMSIZE = 128
)

Builds a type representing a Bucket structure for the given map type. This type is not visible to users - we include only enough information to generate a correct GC program for it. Make sure this stays in sync with runtime/map.go.

View Source 
const (
	Txxx = types.Txxx

	TINT8    = types.TINT8
	TUINT8   = types.TUINT8
	TINT16   = types.TINT16
	TUINT16  = types.TUINT16
	TINT32   = types.TINT32
	TUINT32  = types.TUINT32
	TINT64   = types.TINT64
	TUINT64  = types.TUINT64
	TINT     = types.TINT
	TUINT    = types.TUINT
	TUINTPTR = types.TUINTPTR

	TCOMPLEX64  = types.TCOMPLEX64
	TCOMPLEX128 = types.TCOMPLEX128

	TFLOAT32 = types.TFLOAT32
	TFLOAT64 = types.TFLOAT64

	TBOOL = types.TBOOL

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

	// pseudo-types for literals
	TIDEAL = types.TIDEAL
	TNIL   = types.TNIL
	TBLANK = types.TBLANK

	// pseudo-types for frame layout
	TFUNCARGS = types.TFUNCARGS
	TCHANARGS = types.TCHANARGS

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

	NTYPE = types.NTYPE
)

convenience constants

View Source 
const ArhdrSize = 60

architecture-independent object file output

View Source 
const (
	BADWIDTH = types.BADWIDTH
)
View Source 
const (
	Etype // evaluated in type context

)
View Source 
const MinLevel = -2

There are loops in the escape graph, causing arbitrary recursion into deeper and deeper levels. Cut this off safely by making minLevel sticky: once you get that deep, you cannot go down any further but you also cannot go up any further. This is a conservative fix. Making minLevel smaller (more negative) would handle more complex chains of indirections followed by address-of operations, at the cost of repeating the traversal once for each additional allowed level when a loop is encountered. Using -2 suffices to pass all the tests we have written so far, which we assume matches the level of complexity we want the escape analysis code to handle.

View Source 
const NOTALOOPDEPTH = -1

Variables

View Source 
var (
	Deferreturn,
	Duffcopy,
	Duffzero,

	Udiv *obj.LSym

	BoundsCheckFunc [ssa.BoundsKindCount]*obj.LSym
	ExtendCheckFunc [ssa.BoundsKindCount]*obj.LSym

	// GO386=387
	ControlWord64trunc,
	ControlWord32 *obj.LSym

	// Wasm
	WasmMove,
	WasmZero,
	WasmDiv,
	WasmTruncS,
	WasmTruncU,
	SigPanic *obj.LSym
)
View Source 
var (
	Debug_append       int
	Debug_closure      int
	Debug_compilelater int

	Debug_panic        int
	Debug_slice        int
	Debug_vlog         bool
	Debug_wb           int
	Debug_pctab        string
	Debug_locationlist int
	Debug_typecheckinl int
	Debug_gendwarfinl  int
	Debug_softfloat    int
)
View Source 
var Ctxt *obj.Link
View Source 
var Debug [256]int
View Source 
var Debug_checknil int
View Source 
var (
	Debug_export int // if set, print debugging information about export data
)
View Source 
var Debug_gcprog int // set by -d gcprog
View Source 
var Debug_typeassert int
View Source 
var LivenessInvalid = LivenessIndex{-2, -2}

LivenessInvalid indicates an unsafe point.

We use index -2 because PCDATA tables conventionally start at -1, so -1 is used to mean the entry liveness map (which is actually at index 0; sigh). TODO(austin): Maybe we should use PCDATA+1 as the index into the liveness map so -1 uniquely refers to the entry liveness map.

View Source 
var Nacl bool
View Source 
var Runtimepkg *types.Pkg // fake package runtime
View Source 
var Widthptr int
View Source 
var Widthreg int

Functions

func AddAux added in go1.7 

func AddAux(a *obj.Addr, v *ssa.Value)

AddAux adds the offset in the aux fields (AuxInt and Aux) of v to a.

func AddAux2 added in go1.7 

func AddAux2(a *obj.Addr, v *ssa.Value, offset int64)

func AddrAuto added in go1.8 

func AddrAuto(a *obj.Addr, v *ssa.Value)

func Addrconst added in go1.8 

func Addrconst(a *obj.Addr, v int64)

func AuxOffset added in go1.8 

func AuxOffset(v *ssa.Value) (offset int64)

func CheckLoweredGetClosurePtr added in go1.8 

func CheckLoweredGetClosurePtr(v *ssa.Value)

CheckLoweredGetClosurePtr checks that v is the first instruction in the function's entry block. The output of LoweredGetClosurePtr is generally hardwired to the correct register. That register contains the closure pointer on closure entry.

func CheckLoweredPhi added in go1.8 

func CheckLoweredPhi(v *ssa.Value)

CheckLoweredPhi checks that regalloc and stackalloc correctly handled phi values. Called during ssaGenValue.

func Dump 

func Dump(s string, n *Node)

func Exit 

func Exit(code int)

func Fatalf added in go1.6 

func Fatalf(fmt_ string, args ...interface{})

func IncomparableField added in go1.9 

func IncomparableField(t *types.Type) *types.Field

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

func IsAlias added in go1.9 

func IsAlias(sym *types.Sym) bool

func IsComparable added in go1.9 

func IsComparable(t *types.Type) bool

IsComparable reports whether t is a comparable type.

func IsRegularMemory added in go1.9 

func IsRegularMemory(t *types.Type) bool

IsRegularMemory reports whether t can be compared/hashed as regular memory.

func Isconst 

func Isconst(n *Node, ct Ctype) bool

func Main 

func Main(archInit func(*Arch))

Main parses flags and Go source files specified in the command-line arguments, type-checks the parsed Go package, compiles functions to machine code, and finally writes the compiled package definition to disk.

func Patch 

func Patch(p *obj.Prog, to *obj.Prog)

func Rnd 

func Rnd(o int64, r int64) int64

func Warn 

func Warn(fmt_ string, args ...interface{})

func Warnl 

func Warnl(line src.XPos, fmt_ string, args ...interface{})

Types

type AlgKind added in go1.7 

type AlgKind int

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

const (
	// These values are known by runtime.
	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
)

type Arch 

type Arch struct {
	LinkArch *obj.LinkArch

	REGSP     int
	MAXWIDTH  int64
	Use387    bool // should 386 backend use 387 FP instructions instead of sse2.
	SoftFloat bool

	PadFrame     func(int64) int64
	ZeroRange    func(*Progs, *obj.Prog, int64, int64, *uint32) *obj.Prog
	Ginsnop      func(*Progs) *obj.Prog
	Ginsnopdefer func(*Progs) *obj.Prog // special ginsnop for deferreturn

	// SSAMarkMoves marks any MOVXconst ops that need to avoid clobbering flags.
	SSAMarkMoves func(*SSAGenState, *ssa.Block)

	// SSAGenValue emits Prog(s) for the Value.
	SSAGenValue func(*SSAGenState, *ssa.Value)

	// SSAGenBlock emits end-of-block Progs. SSAGenValue should be called
	// for all values in the block before SSAGenBlock.
	SSAGenBlock func(s *SSAGenState, b, next *ssa.Block)

	// ZeroAuto emits code to zero the given auto stack variable.
	// ZeroAuto must not use any non-temporary registers.
	// ZeroAuto will only be called for variables which contain a pointer.
	ZeroAuto func(*Progs, *Node)
}

type BlockEffects added in go1.9 

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

BlockEffects summarizes the liveness effects on an SSA block.

type Branch added in go1.7 

type Branch struct {
	P *obj.Prog  // branch instruction
	B *ssa.Block // target
}

Branch is an unresolved branch.

type Class added in go1.6 

type Class uint8

The Class of a variable/function describes the "storage class" of a variable or function. During parsing, storage classes are called declaration contexts. 

const (
	Pxxx      Class = iota // no class; used during ssa conversion to indicate pseudo-variables
	PEXTERN                // global variable
	PAUTO                  // local variables
	PAUTOHEAP              // local variable or parameter moved to heap
	PPARAM                 // input arguments
	PPARAMOUT              // output results
	PFUNC                  // global function

	PDISCARD // discard during parse of duplicate import

)

func (Class) String added in go1.9 

func (i Class) String() string

type Ctype added in go1.6 

type Ctype uint8

Ctype describes the constant kind of an "ideal" (untyped) constant. 

const (
	CTxxx Ctype = iota

	CTINT
	CTRUNE
	CTFLT
	CTCPLX
	CTSTR
	CTBOOL
	CTNIL
)

type Dlist 

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

A Dlist stores a pointer to a TFIELD Type embedded within a TSTRUCT or TINTER Type.

type Error 

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

type EscEdge added in go1.13 

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

An EscEdge represents an assignment edge between two Go variables.

type EscHole added in go1.13 

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

An EscHole represents a context for evaluation a Go expression. E.g., when evaluating p in "x = **p", we'd have a hole with dst==x and derefs==2.

type EscLocation added in go1.13 

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

An EscLocation represents an abstract location that stores a Go variable.

type EscState 

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

type EscStep added in go1.7 

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

An EscStep documents one step in the path from memory that is heap allocated to the (alleged) reason for the heap allocation.

type Escape added in go1.13 

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

type FloatingEQNEJump added in go1.7 

type FloatingEQNEJump struct {
	Jump  obj.As
	Index int
}

type FmtFlag added in go1.7 

type FmtFlag int

A FmtFlag value is a set of flags (or 0). They control how the Xconv functions format their values. See the respective function's documentation for details. 

const (
	FmtLeft     FmtFlag = 1 << iota // '-'
	FmtSharp                        // '#'
	FmtSign                         // '+'
	FmtUnsigned                     // internal use only (historic: u flag)
	FmtShort                        // verb == 'S'       (historic: h flag)
	FmtLong                         // verb == 'L'       (historic: l flag)
	FmtComma                        // '.' (== hasPrec)  (historic: , flag)
	FmtByte                         // '0'               (historic: hh flag)
)

type Func 

type Func struct {
	Shortname *types.Sym
	Enter     Nodes // for example, allocate and initialize memory for escaping parameters
	Exit      Nodes
	Cvars     Nodes   // closure params
	Dcl       []*Node // autodcl for this func/closure

	// Parents records the parent scope of each scope within a
	// function. The root scope (0) has no parent, so the i'th
	// scope's parent is stored at Parents[i-1].
	Parents []ScopeID

	// Marks records scope boundary changes.
	Marks []Mark

	// Closgen tracks how many closures have been generated within
	// this function. Used by closurename for creating unique
	// function names.
	Closgen int

	FieldTrack map[*types.Sym]struct{}
	DebugInfo  *ssa.FuncDebug
	Ntype      *Node // signature
	Top        int   // top context (ctxCallee, etc)
	Closure    *Node // OCLOSURE <-> ODCLFUNC
	Nname      *Node

	Inl *Inline

	Label int32 // largest auto-generated label in this function

	Endlineno src.XPos
	WBPos     src.XPos // position of first write barrier; see SetWBPos

	Pragma syntax.Pragma // go:xxx function annotations
	// contains filtered or unexported fields
}

Func holds Node fields used only with function-like nodes.

func (*Func) Dupok 

func (f *Func) Dupok() bool

func (*Func) ExportInline added in go1.10 

func (f *Func) ExportInline() bool

func (*Func) HasDefer added in go1.9 

func (f *Func) HasDefer() bool

func (*Func) InlinabilityChecked added in go1.10 

func (f *Func) InlinabilityChecked() bool

func (*Func) InstrumentBody added in go1.11 

func (f *Func) InstrumentBody() bool

func (*Func) IsHiddenClosure added in go1.8 

func (f *Func) IsHiddenClosure() bool

func (*Func) Needctxt 

func (f *Func) Needctxt() bool

func (*Func) NilCheckDisabled added in go1.9 

func (f *Func) NilCheckDisabled() bool

func (*Func) ReflectMethod added in go1.7 

func (f *Func) ReflectMethod() bool

func (*Func) SetDupok added in go1.9 

func (f *Func) SetDupok(b bool)

func (*Func) SetExportInline added in go1.10 

func (f *Func) SetExportInline(b bool)

func (*Func) SetHasDefer added in go1.9 

func (f *Func) SetHasDefer(b bool)

func (*Func) SetInlinabilityChecked added in go1.10 

func (f *Func) SetInlinabilityChecked(b bool)

func (*Func) SetInstrumentBody added in go1.11 

func (f *Func) SetInstrumentBody(b bool)

func (*Func) SetIsHiddenClosure added in go1.9 

func (f *Func) SetIsHiddenClosure(b bool)

func (*Func) SetNeedctxt added in go1.9 

func (f *Func) SetNeedctxt(b bool)

func (*Func) SetNilCheckDisabled added in go1.9 

func (f *Func) SetNilCheckDisabled(b bool)

func (*Func) SetReflectMethod added in go1.9 

func (f *Func) SetReflectMethod(b bool)

func (*Func) SetWrapper added in go1.9 

func (f *Func) SetWrapper(b bool)

func (*Func) Wrapper 

func (f *Func) Wrapper() bool

type GCProg 

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

type InitEntry 

type InitEntry struct {
	Xoffset int64 // struct, array only
	Expr    *Node // bytes of run-time computed expressions
}

type InitOrder added in go1.13 

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

type InitPlan 

type InitPlan struct {
	E []InitEntry
}

type InitSchedule added in go1.13 

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

An InitSchedule is used to decompose assignment statements into static and dynamic initialization parts. Static initializations are handled by populating variables' linker symbol data, while dynamic initializations are accumulated to be executed in order.

type Inline added in go1.11 

type Inline struct {
	Cost int32 // heuristic cost of inlining this function

	// Copies of Func.Dcl and Nbody for use during inlining.
	Dcl  []*Node
	Body []*Node
}

An Inline holds fields used for function bodies that can be inlined.

type Level 

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

There's one of these for each Node, and the integer values rarely exceed even what can be stored in 4 bits, never mind 8.

type Liveness 

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

A collection of global state used by liveness analysis.

type LivenessIndex added in go1.11 

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

LivenessIndex stores the liveness map index for a safe-point.

func (LivenessIndex) Valid added in go1.11 

func (idx LivenessIndex) Valid() bool

type LivenessMap added in go1.11 

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

LivenessMap maps from *ssa.Value to LivenessIndex.

func (LivenessMap) Get added in go1.11 

func (m LivenessMap) Get(v *ssa.Value) LivenessIndex

type Mark added in go1.9 

type Mark struct {
	// Pos is the position of the token that marks the scope
	// change.
	Pos src.XPos

	// Scope identifies the innermost scope to the right of Pos.
	Scope ScopeID
}

A Mark represents a scope boundary.

type Mpcplx 

type Mpcplx struct {
	Real Mpflt
	Imag Mpflt
}

Mpcplx represents a complex constant.

func (*Mpcplx) Div added in go1.11 

func (v *Mpcplx) Div(rv *Mpcplx) bool

complex divide v /= rv 

(a, b) / (c, d) = ((a*c + b*d), (b*c - a*d))/(c*c + d*d)

func (*Mpcplx) GoString added in go1.12 

func (v *Mpcplx) GoString() string

func (*Mpcplx) Mul added in go1.11 

func (v *Mpcplx) Mul(rv *Mpcplx)

complex multiply v *= rv 

(a, b) * (c, d) = (a*c - b*d, b*c + a*d)

func (*Mpcplx) String added in go1.12 

func (v *Mpcplx) String() string

type Mpflt 

type Mpflt struct {
	Val big.Float
}

Mpflt represents a floating-point constant.

func (*Mpflt) Add added in go1.7 

func (a *Mpflt) Add(b *Mpflt)

func (*Mpflt) AddFloat64 added in go1.7 

func (a *Mpflt) AddFloat64(c float64)

func (*Mpflt) Cmp added in go1.7 

func (a *Mpflt) Cmp(b *Mpflt) int

func (*Mpflt) CmpFloat64 added in go1.7 

func (a *Mpflt) CmpFloat64(c float64) int

func (*Mpflt) Float32 added in go1.7 

func (a *Mpflt) Float32() float64

func (*Mpflt) Float64 added in go1.7 

func (a *Mpflt) Float64() float64

func (*Mpflt) GoString added in go1.12 

func (fvp *Mpflt) GoString() string

func (*Mpflt) Mul added in go1.7 

func (a *Mpflt) Mul(b *Mpflt)

func (*Mpflt) MulFloat64 added in go1.7 

func (a *Mpflt) MulFloat64(c float64)

func (*Mpflt) Neg added in go1.7 

func (a *Mpflt) Neg()

func (*Mpflt) Quo added in go1.7 

func (a *Mpflt) Quo(b *Mpflt)

func (*Mpflt) Set added in go1.7 

func (a *Mpflt) Set(b *Mpflt)

func (*Mpflt) SetFloat64 added in go1.7 

func (a *Mpflt) SetFloat64(c float64)

func (*Mpflt) SetInt added in go1.7 

func (a *Mpflt) SetInt(b *Mpint)

func (*Mpflt) SetString added in go1.7 

func (a *Mpflt) SetString(as string)

func (*Mpflt) String 

func (f *Mpflt) String() string

func (*Mpflt) Sub added in go1.7 

func (a *Mpflt) Sub(b *Mpflt)

type Mpint 

type Mpint struct {
	Val  big.Int
	Ovf  bool // set if Val overflowed compiler limit (sticky)
	Rune bool // set if syntax indicates default type rune
}

Mpint represents an integer constant.

func (*Mpint) Add added in go1.7 

func (a *Mpint) Add(b *Mpint)

func (*Mpint) And added in go1.7 

func (a *Mpint) And(b *Mpint)

func (*Mpint) AndNot added in go1.7 

func (a *Mpint) AndNot(b *Mpint)

func (*Mpint) Cmp added in go1.7 

func (a *Mpint) Cmp(b *Mpint) int

func (*Mpint) CmpInt64 added in go1.7 

func (a *Mpint) CmpInt64(c int64) int

func (*Mpint) GoString added in go1.12 

func (a *Mpint) GoString() string

func (*Mpint) Int64 added in go1.7 

func (a *Mpint) Int64() int64

func (*Mpint) Lsh added in go1.7 

func (a *Mpint) Lsh(b *Mpint)

func (*Mpint) Mul added in go1.7 

func (a *Mpint) Mul(b *Mpint)

func (*Mpint) Neg added in go1.7 

func (a *Mpint) Neg()

func (*Mpint) Or added in go1.7 

func (a *Mpint) Or(b *Mpint)

func (*Mpint) Quo added in go1.7 

func (a *Mpint) Quo(b *Mpint)

func (*Mpint) Rem added in go1.7 

func (a *Mpint) Rem(b *Mpint)

func (*Mpint) Rsh added in go1.7 

func (a *Mpint) Rsh(b *Mpint)

func (*Mpint) Set added in go1.7 

func (a *Mpint) Set(b *Mpint)

func (*Mpint) SetFloat added in go1.7 

func (a *Mpint) SetFloat(b *Mpflt) bool

func (*Mpint) SetInt64 added in go1.7 

func (a *Mpint) SetInt64(c int64)

func (*Mpint) SetOverflow added in go1.7 

func (a *Mpint) SetOverflow()

func (*Mpint) SetString added in go1.7 

func (a *Mpint) SetString(as string)

func (*Mpint) String 

func (a *Mpint) String() string

func (*Mpint) Sub added in go1.7 

func (a *Mpint) Sub(b *Mpint)

func (*Mpint) Xor added in go1.7 

func (a *Mpint) Xor(b *Mpint)

type Name 

type Name struct {
	Pack      *Node      // real package for import . names
	Pkg       *types.Pkg // pkg for OPACK nodes
	Defn      *Node      // initializing assignment
	Curfn     *Node      // function for local variables
	Param     *Param     // additional fields for ONAME, OTYPE
	Decldepth int32      // declaration loop depth, increased for every loop or label
	Vargen    int32      // unique name for ONAME within a function.  Function outputs are numbered starting at one.
	// contains filtered or unexported fields
}

Name holds Node fields used only by named nodes (ONAME, OTYPE, OPACK, OLABEL, some OLITERAL).

func (*Name) AutoTemp added in go1.8 

func (n *Name) AutoTemp() bool

func (*Name) Byval 

func (n *Name) Byval() bool

func (*Name) Captured 

func (n *Name) Captured() bool

func (*Name) Keepalive added in go1.6 

func (n *Name) Keepalive() bool

func (*Name) Needzero 

func (n *Name) Needzero() bool

func (*Name) Readonly 

func (n *Name) Readonly() bool

func (*Name) SetAutoTemp added in go1.9 

func (n *Name) SetAutoTemp(b bool)

func (*Name) SetByval added in go1.9 

func (n *Name) SetByval(b bool)

func (*Name) SetCaptured added in go1.9 

func (n *Name) SetCaptured(b bool)

func (*Name) SetKeepalive added in go1.9 

func (n *Name) SetKeepalive(b bool)

func (*Name) SetNeedzero added in go1.9 

func (n *Name) SetNeedzero(b bool)

func (*Name) SetReadonly added in go1.9 

func (n *Name) SetReadonly(b bool)

func (*Name) SetUsed added in go1.9 

func (n *Name) SetUsed(b bool)

func (*Name) Used added in go1.9 

func (n *Name) Used() bool

type NilVal 

type NilVal struct{}

type Node 

type Node struct {
	// Tree structure.
	// Generic recursive walks should follow these fields.
	Left  *Node
	Right *Node
	Ninit Nodes
	Nbody Nodes
	List  Nodes
	Rlist Nodes

	// most nodes
	Type *types.Type
	Orig *Node // original form, for printing, and tracking copies of ONAMEs

	// func
	Func *Func

	// ONAME, OTYPE, OPACK, OLABEL, some OLITERAL
	Name *Name

	Sym *types.Sym  // various
	E   interface{} // Opt or Val, see methods below

	// Various. Usually an offset into a struct. For example:
	// - ONAME nodes that refer to local variables use it to identify their stack frame position.
	// - ODOT, ODOTPTR, and ORESULT use it to indicate offset relative to their base address.
	// - OSTRUCTKEY uses it to store the named field's offset.
	// - Named OLITERALs use it to store their ambient iota value.
	// - OINLMARK stores an index into the inlTree data structure.
	// Possibly still more uses. If you find any, document them.
	Xoffset int64

	Pos src.XPos

	Esc uint16 // EscXXX

	Op Op
	// contains filtered or unexported fields
}

A Node is a single node in the syntax tree. Actually the syntax tree is a syntax DAG, because there is only one node with Op=ONAME for a given instance of a variable x. The same is true for Op=OTYPE and Op=OLITERAL. See Node.mayBeShared. 

var Curfn *Node

func AutoVar added in go1.7 

func AutoVar(v *ssa.Value) (*Node, int64)

AutoVar returns a *Node and int64 representing the auto variable and offset within it where v should be spilled.

func (*Node) Addable 

func (n *Node) Addable() bool

func (*Node) Addrtaken 

func (n *Node) Addrtaken() bool

func (*Node) Assigned 

func (n *Node) Assigned() bool

func (*Node) Bool 

func (n *Node) Bool() bool

Bool returns n as a bool. n must be a boolean constant.

func (*Node) Bounded 

func (n *Node) Bounded() bool

func (*Node) CanInt64 added in go1.10.5 

func (n *Node) CanInt64() bool

CanInt64 reports whether it is safe to call Int64() on n.

func (*Node) Class 

func (n *Node) Class() Class

func (*Node) Colas 

func (n *Node) Colas() bool

func (*Node) Diag 

func (n *Node) Diag() bool

func (*Node) Embedded 

func (n *Node) Embedded() bool

func (*Node) Format added in go1.8 

func (n *Node) Format(s fmt.State, verb rune)

func (*Node) HasBreak added in go1.7 

func (n *Node) HasBreak() bool

func (*Node) HasCall added in go1.9 

func (n *Node) HasCall() bool

func (*Node) HasOpt added in go1.9 

func (n *Node) HasOpt() bool

func (*Node) HasVal added in go1.9 

func (n *Node) HasVal() bool

func (*Node) Implicit 

func (n *Node) Implicit() bool

func (*Node) IndexMapLValue added in go1.11 

func (n *Node) IndexMapLValue() bool

func (*Node) Initorder 

func (n *Node) Initorder() uint8

func (*Node) InlFormal added in go1.10 

func (n *Node) InlFormal() bool

func (*Node) InlLocal added in go1.10 

func (n *Node) InlLocal() bool

func (*Node) Int64 added in go1.7 

func (n *Node) Int64() int64

Int64 returns n as an int64. n must be an integer or rune constant.

func (*Node) Iota added in go1.8 

func (n *Node) Iota() int64

func (*Node) IsAutoTmp added in go1.8 

func (n *Node) IsAutoTmp() bool

IsAutoTmp indicates if n was created by the compiler as a temporary, based on the setting of the .AutoTemp flag in n's Name.

func (*Node) IsClosureVar added in go1.9 

func (n *Node) IsClosureVar() bool

func (*Node) IsDDD added in go1.12 

func (n *Node) IsDDD() bool

func (*Node) IsMethod added in go1.8 

func (n *Node) IsMethod() bool

IsMethod reports whether n is a method. n must be a function or a method.

func (*Node) IsOutputParamHeapAddr added in go1.7 

func (n *Node) IsOutputParamHeapAddr() bool

func (*Node) IsSynthetic added in go1.11 

func (n *Node) IsSynthetic() bool

func (*Node) Likely 

func (n *Node) Likely() bool

func (*Node) Line 

func (n *Node) Line() string

Line returns n's position as a string. If n has been inlined, it uses the outermost position where n has been inlined.

func (*Node) NoInline added in go1.9 

func (n *Node) NoInline() bool

func (*Node) Noescape 

func (n *Node) Noescape() bool

func (*Node) NonNil added in go1.7 

func (n *Node) NonNil() bool

func (*Node) Opt 

func (n *Node) Opt() interface{}

Opt returns the optimizer data for the node.

func (*Node) ResetAux added in go1.11 

func (n *Node) ResetAux()

func (*Node) SetAddable added in go1.9 

func (n *Node) SetAddable(b bool)

func (*Node) SetAddrtaken added in go1.9 

func (n *Node) SetAddrtaken(b bool)

func (*Node) SetAssigned added in go1.9 

func (n *Node) SetAssigned(b bool)

func (*Node) SetBounded added in go1.9 

func (n *Node) SetBounded(b bool)

func (*Node) SetClass added in go1.9 

func (n *Node) SetClass(b Class)

func (*Node) SetColas added in go1.9 

func (n *Node) SetColas(b bool)

func (*Node) SetDiag added in go1.9 

func (n *Node) SetDiag(b bool)

func (*Node) SetEmbedded added in go1.9 

func (n *Node) SetEmbedded(b bool)

func (*Node) SetHasBreak added in go1.7 

func (n *Node) SetHasBreak(b bool)

func (*Node) SetHasCall added in go1.9 

func (n *Node) SetHasCall(b bool)

func (*Node) SetHasOpt added in go1.9 

func (n *Node) SetHasOpt(b bool)

func (*Node) SetHasVal added in go1.9 

func (n *Node) SetHasVal(b bool)

func (*Node) SetImplicit added in go1.9 

func (n *Node) SetImplicit(b bool)

func (*Node) SetIndexMapLValue added in go1.11 

func (n *Node) SetIndexMapLValue(b bool)

func (*Node) SetInitorder added in go1.9 

func (n *Node) SetInitorder(b uint8)

func (*Node) SetInlFormal added in go1.10 

func (n *Node) SetInlFormal(b bool)

func (*Node) SetInlLocal added in go1.10 

func (n *Node) SetInlLocal(b bool)

func (*Node) SetIota added in go1.8 

func (n *Node) SetIota(x int64)

func (*Node) SetIsClosureVar added in go1.9 

func (n *Node) SetIsClosureVar(b bool)

func (*Node) SetIsDDD added in go1.12 

func (n *Node) SetIsDDD(b bool)

func (*Node) SetIsOutputParamHeapAddr added in go1.9 

func (n *Node) SetIsOutputParamHeapAddr(b bool)

func (*Node) SetLikely added in go1.9 

func (n *Node) SetLikely(b bool)

func (*Node) SetNoInline added in go1.9 

func (n *Node) SetNoInline(b bool)

func (*Node) SetNoescape added in go1.9 

func (n *Node) SetNoescape(b bool)

func (*Node) SetNonNil added in go1.9 

func (n *Node) SetNonNil(b bool)

func (*Node) SetOpt 

func (n *Node) SetOpt(x interface{})

SetOpt sets the optimizer data for the node, which must not have been used with SetVal. SetOpt(nil) is ignored for Vals to simplify call sites that are clearing Opts.

func (*Node) SetSliceBounds added in go1.7 

func (n *Node) SetSliceBounds(low, high, max *Node)

SetSliceBounds sets n's slice bounds, where n is a slice expression. n must be a slice expression. If max is non-nil, n must be a full slice expression.

func (*Node) SetSubOp added in go1.11 

func (n *Node) SetSubOp(op Op)

func (*Node) SetTChanDir added in go1.11 

func (n *Node) SetTChanDir(dir types.ChanDir)

func (*Node) SetTypecheck added in go1.9 

func (n *Node) SetTypecheck(b uint8)

func (*Node) SetVal 

func (n *Node) SetVal(v Val)

SetVal sets the Val for the node, which must not have been used with SetOpt.

func (*Node) SetWalkdef added in go1.9 

func (n *Node) SetWalkdef(b uint8)

func (*Node) SliceBounds added in go1.7 

func (n *Node) SliceBounds() (low, high, max *Node)

SliceBounds returns n's slice bounds: low, high, and max in expr[low:high:max]. n must be a slice expression. max is nil if n is a simple slice expression.

func (*Node) StorageClass added in go1.10 

func (n *Node) StorageClass() ssa.StorageClass

func (*Node) String 

func (n *Node) String() string

func (*Node) SubOp added in go1.11 

func (n *Node) SubOp() Op

func (*Node) TChanDir added in go1.11 

func (n *Node) TChanDir() types.ChanDir

func (*Node) Typ added in go1.7 

func (n *Node) Typ() *types.Type

func (*Node) Typecheck 

func (n *Node) Typecheck() uint8

func (*Node) Val 

func (n *Node) Val() Val

Val returns the Val for the node.

func (*Node) Walkdef 

func (n *Node) Walkdef() uint8

type NodeEscState 

type NodeEscState struct {
	Curfn             *Node
	Flowsrc           []EscStep // flow(this, src)
	Retval            Nodes     // on OCALLxxx, list of dummy return values
	Loopdepth         int32     // -1: global, 0: return variables, 1:function top level, increased inside function for every loop or label to mark scopes
	Level             Level
	Walkgen           uint32
	Maxextraloopdepth int32
}

type NodeSet added in go1.13 

type NodeSet map[*Node]struct{}

NodeSet is a set of Nodes.

func (*NodeSet) Add added in go1.13 

func (s *NodeSet) Add(n *Node)

Add adds n to s.

func (NodeSet) Has added in go1.13 

func (s NodeSet) Has(n *Node) bool

Has reports whether s contains n.

func (NodeSet) Sorted added in go1.13 

func (s NodeSet) Sorted(less func(*Node, *Node) bool) []*Node

Sorted returns s sorted according to less.

type Nodes added in go1.7 

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

Nodes is a pointer to a slice of *Node. For fields that are not used in most nodes, this is used instead of a slice to save space.

func (Nodes) Addr added in go1.7 

func (n Nodes) Addr(i int) **Node

Addr returns the address of the i'th element of Nodes. It panics if n does not have at least i+1 elements.

func (*Nodes) Append added in go1.7 

func (n *Nodes) Append(a ...*Node)

Append appends entries to Nodes.

func (*Nodes) AppendNodes added in go1.7 

func (n *Nodes) AppendNodes(n2 *Nodes)

AppendNodes appends the contents of *n2 to n, then clears n2.

func (Nodes) First added in go1.7 

func (n Nodes) First() *Node

First returns the first element of Nodes (same as n.Index(0)). It panics if n has no elements.

func (Nodes) Format added in go1.8 

func (n Nodes) Format(s fmt.State, verb rune)

func (Nodes) Index added in go1.7 

func (n Nodes) Index(i int) *Node

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

func (Nodes) Len added in go1.7 

func (n Nodes) Len() int

Len returns the number of entries in Nodes.

func (*Nodes) MoveNodes added in go1.7 

func (n *Nodes) MoveNodes(n2 *Nodes)

MoveNodes sets n to the contents of n2, then clears n2.

func (*Nodes) Prepend added in go1.8 

func (n *Nodes) Prepend(a ...*Node)

Prepend prepends entries to Nodes. If a slice is passed in, this will take ownership of it.

func (Nodes) Second added in go1.7 

func (n Nodes) Second() *Node

Second returns the second element of Nodes (same as n.Index(1)). It panics if n has fewer than two elements.

func (*Nodes) Set added in go1.7 

func (n *Nodes) Set(s []*Node)

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

func (*Nodes) Set1 added in go1.7 

func (n *Nodes) Set1(n1 *Node)

Set1 sets n to a slice containing a single node.

func (*Nodes) Set2 added in go1.8 

func (n *Nodes) Set2(n1, n2 *Node)

Set2 sets n to a slice containing two nodes.

func (*Nodes) Set3 added in go1.9 

func (n *Nodes) Set3(n1, n2, n3 *Node)

Set3 sets n to a slice containing three nodes.

func (Nodes) SetFirst added in go1.9 

func (n Nodes) SetFirst(node *Node)

SetFirst sets the first element of Nodes to node. It panics if n does not have at least one elements.

func (Nodes) SetIndex added in go1.7 

func (n Nodes) SetIndex(i int, node *Node)

SetIndex sets the i'th element of Nodes to node. It panics if n does not have at least i+1 elements.

func (Nodes) SetSecond added in go1.9 

func (n Nodes) SetSecond(node *Node)

SetSecond sets the second element of Nodes to node. It panics if n does not have at least two elements.

func (Nodes) Slice added in go1.7 

func (n Nodes) Slice() []*Node

Slice returns the entries in Nodes as a slice. Changes to the slice entries (as in s[i] = n) will be reflected in the Nodes.

func (Nodes) String added in go1.7 

func (n Nodes) String() string

type Op added in go1.6 

type Op uint8
const (
	OXXX Op = iota

	// names
	ONAME    // var or func name
	ONONAME  // unnamed arg or return value: f(int, string) (int, error) { etc }
	OTYPE    // type name
	OPACK    // import
	OLITERAL // literal

	// expressions
	OADD          // Left + Right
	OSUB          // Left - Right
	OOR           // Left | Right
	OXOR          // Left ^ Right
	OADDSTR       // +{List} (string addition, list elements are strings)
	OADDR         // &Left
	OANDAND       // Left && Right
	OAPPEND       // append(List); after walk, Left may contain elem type descriptor
	OBYTES2STR    // Type(Left) (Type is string, Left is a []byte)
	OBYTES2STRTMP // Type(Left) (Type is string, Left is a []byte, ephemeral)
	ORUNES2STR    // Type(Left) (Type is string, Left is a []rune)
	OSTR2BYTES    // Type(Left) (Type is []byte, Left is a string)
	OSTR2BYTESTMP // Type(Left) (Type is []byte, Left is a string, ephemeral)
	OSTR2RUNES    // Type(Left) (Type is []rune, Left is a string)
	OAS           // Left = Right or (if Colas=true) Left := Right
	OAS2          // List = Rlist (x, y, z = a, b, c)
	OAS2DOTTYPE   // List = Rlist (x, ok = I.(int))
	OAS2FUNC      // List = Rlist (x, y = f())
	OAS2MAPR      // List = Rlist (x, ok = m["foo"])
	OAS2RECV      // List = Rlist (x, ok = <-c)
	OASOP         // Left Etype= Right (x += y)
	OCALL         // Left(List) (function call, method call or type conversion)

	// OCALLFUNC, OCALLMETH, and OCALLINTER have the same structure.
	// Prior to walk, they are: Left(List), where List is all regular arguments.
	// If present, Right is an ODDDARG that holds the
	// generated slice used in a call to a variadic function.
	// After walk, List is a series of assignments to temporaries,
	// and Rlist is an updated set of arguments, including any ODDDARG slice.
	// TODO(josharian/khr): Use Ninit instead of List for the assignments to temporaries. See CL 114797.
	OCALLFUNC  // Left(List/Rlist) (function call f(args))
	OCALLMETH  // Left(List/Rlist) (direct method call x.Method(args))
	OCALLINTER // Left(List/Rlist) (interface method call x.Method(args))
	OCALLPART  // Left.Right (method expression x.Method, not called)
	OCAP       // cap(Left)
	OCLOSE     // close(Left)
	OCLOSURE   // func Type { Body } (func literal)
	OCOMPLIT   // Right{List} (composite literal, not yet lowered to specific form)
	OMAPLIT    // Type{List} (composite literal, Type is map)
	OSTRUCTLIT // Type{List} (composite literal, Type is struct)
	OARRAYLIT  // Type{List} (composite literal, Type is array)
	OSLICELIT  // Type{List} (composite literal, Type is slice) Right.Int64() = slice length.
	OPTRLIT    // &Left (left is composite literal)
	OCONV      // Type(Left) (type conversion)
	OCONVIFACE // Type(Left) (type conversion, to interface)
	OCONVNOP   // Type(Left) (type conversion, no effect)
	OCOPY      // copy(Left, Right)
	ODCL       // var Left (declares Left of type Left.Type)

	// Used during parsing but don't last.
	ODCLFUNC  // func f() or func (r) f()
	ODCLFIELD // struct field, interface field, or func/method argument/return value.
	ODCLCONST // const pi = 3.14
	ODCLTYPE  // type Int int or type Int = int

	ODELETE      // delete(Left, Right)
	ODOT         // Left.Sym (Left is of struct type)
	ODOTPTR      // Left.Sym (Left is of pointer to struct type)
	ODOTMETH     // Left.Sym (Left is non-interface, Right is method name)
	ODOTINTER    // Left.Sym (Left is interface, Right is method name)
	OXDOT        // Left.Sym (before rewrite to one of the preceding)
	ODOTTYPE     // Left.Right or Left.Type (.Right during parsing, .Type once resolved); after walk, .Right contains address of interface type descriptor and .Right.Right contains address of concrete type descriptor
	ODOTTYPE2    // Left.Right or Left.Type (.Right during parsing, .Type once resolved; on rhs of OAS2DOTTYPE); after walk, .Right contains address of interface type descriptor
	OEQ          // Left == Right
	ONE          // Left != Right
	OLT          // Left < Right
	OLE          // Left <= Right
	OGE          // Left >= Right
	OGT          // Left > Right
	ODEREF       // *Left
	OINDEX       // Left[Right] (index of array or slice)
	OINDEXMAP    // Left[Right] (index of map)
	OKEY         // Left:Right (key:value in struct/array/map literal)
	OSTRUCTKEY   // Sym:Left (key:value in struct literal, after type checking)
	OLEN         // len(Left)
	OMAKE        // make(List) (before type checking converts to one of the following)
	OMAKECHAN    // make(Type, Left) (type is chan)
	OMAKEMAP     // make(Type, Left) (type is map)
	OMAKESLICE   // make(Type, Left, Right) (type is slice)
	OMUL         // Left * Right
	ODIV         // Left / Right
	OMOD         // Left % Right
	OLSH         // Left << Right
	ORSH         // Left >> Right
	OAND         // Left & Right
	OANDNOT      // Left &^ Right
	ONEW         // new(Left); corresponds to calls to new in source code
	ONEWOBJ      // runtime.newobject(n.Type); introduced by walk; Left is type descriptor
	ONOT         // !Left
	OBITNOT      // ^Left
	OPLUS        // +Left
	ONEG         // -Left
	OOROR        // Left || Right
	OPANIC       // panic(Left)
	OPRINT       // print(List)
	OPRINTN      // println(List)
	OPAREN       // (Left)
	OSEND        // Left <- Right
	OSLICE       // Left[List[0] : List[1]] (Left is untypechecked or slice)
	OSLICEARR    // Left[List[0] : List[1]] (Left is array)
	OSLICESTR    // Left[List[0] : List[1]] (Left is string)
	OSLICE3      // Left[List[0] : List[1] : List[2]] (Left is untypedchecked or slice)
	OSLICE3ARR   // Left[List[0] : List[1] : List[2]] (Left is array)
	OSLICEHEADER // sliceheader{Left, List[0], List[1]} (Left is unsafe.Pointer, List[0] is length, List[1] is capacity)
	ORECOVER     // recover()
	ORECV        // <-Left
	ORUNESTR     // Type(Left) (Type is string, Left is rune)
	OSELRECV     // Left = <-Right.Left: (appears as .Left of OCASE; Right.Op == ORECV)
	OSELRECV2    // List = <-Right.Left: (apperas as .Left of OCASE; count(List) == 2, Right.Op == ORECV)
	OIOTA        // iota
	OREAL        // real(Left)
	OIMAG        // imag(Left)
	OCOMPLEX     // complex(Left, Right) or complex(List[0]) where List[0] is a 2-result function call
	OALIGNOF     // unsafe.Alignof(Left)
	OOFFSETOF    // unsafe.Offsetof(Left)
	OSIZEOF      // unsafe.Sizeof(Left)

	// statements
	OBLOCK    // { List } (block of code)
	OBREAK    // break [Sym]
	OCASE     // case Left or List[0]..List[1]: Nbody (select case after processing; Left==nil and List==nil means default)
	OXCASE    // case List: Nbody (select case before processing; List==nil means default)
	OCONTINUE // continue [Sym]
	ODEFER    // defer Left (Left must be call)
	OEMPTY    // no-op (empty statement)
	OFALL     // fallthrough
	OFOR      // for Ninit; Left; Right { Nbody }
	// OFORUNTIL is like OFOR, but the test (Left) is applied after the body:
	// 	Ninit
	// 	top: { Nbody }   // Execute the body at least once
	// 	cont: Right
	// 	if Left {        // And then test the loop condition
	// 		List     // Before looping to top, execute List
	// 		goto top
	// 	}
	// OFORUNTIL is created by walk. There's no way to write this in Go code.
	OFORUNTIL
	OGOTO   // goto Sym
	OIF     // if Ninit; Left { Nbody } else { Rlist }
	OLABEL  // Sym:
	OGO     // go Left (Left must be call)
	ORANGE  // for List = range Right { Nbody }
	ORETURN // return List
	OSELECT // select { List } (List is list of OXCASE or OCASE)
	OSWITCH // switch Ninit; Left { List } (List is a list of OXCASE or OCASE)
	OTYPESW // Left = Right.(type) (appears as .Left of OSWITCH)

	// types
	OTCHAN   // chan int
	OTMAP    // map[string]int
	OTSTRUCT // struct{}
	OTINTER  // interface{}
	OTFUNC   // func()
	OTARRAY  // []int, [8]int, [N]int or [...]int

	// misc
	ODDD        // func f(args ...int) or f(l...) or var a = [...]int{0, 1, 2}.
	ODDDARG     // func f(args ...int), introduced by escape analysis.
	OINLCALL    // intermediary representation of an inlined call.
	OEFACE      // itable and data words of an empty-interface value.
	OITAB       // itable word of an interface value.
	OIDATA      // data word of an interface value in Left
	OSPTR       // base pointer of a slice or string.
	OCLOSUREVAR // variable reference at beginning of closure function
	OCFUNC      // reference to c function pointer (not go func value)
	OCHECKNIL   // emit code to ensure pointer/interface not nil
	OVARDEF     // variable is about to be fully initialized
	OVARKILL    // variable is dead
	OVARLIVE    // variable is alive
	ORESULT     // result of a function call; Xoffset is stack offset
	OINLMARK    // start of an inlined body, with file/line of caller. Xoffset is an index into the inline tree.

	// arch-specific opcodes
	ORETJMP // return to other function
	OGETG   // runtime.getg() (read g pointer)

	OEND
)

Node ops.

func (Op) Format added in go1.8 

func (o Op) Format(s fmt.State, verb rune)

func (Op) GoString added in go1.7 

func (o Op) GoString() string

func (Op) IsSlice3 added in go1.7 

func (o Op) IsSlice3() bool

IsSlice3 reports whether o is a slice3 op (OSLICE3, OSLICE3ARR). o must be a slicing op.

func (Op) String added in go1.7 

func (i Op) String() string

type Order 

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

Order holds state during the ordering process.

type Param 

type Param struct {
	Ntype    *Node
	Heapaddr *Node // temp holding heap address of param

	// ONAME PAUTOHEAP
	Stackcopy *Node // the PPARAM/PPARAMOUT on-stack slot (moved func params only)

	// ONAME closure linkage
	// Consider:
	//
	//	func f() {
	//		x := 1 // x1
	//		func() {
	//			use(x) // x2
	//			func() {
	//				use(x) // x3
	//				--- parser is here ---
	//			}()
	//		}()
	//	}
	//
	// There is an original declaration of x and then a chain of mentions of x
	// leading into the current function. Each time x is mentioned in a new closure,
	// we create a variable representing x for use in that specific closure,
	// since the way you get to x is different in each closure.
	//
	// Let's number the specific variables as shown in the code:
	// x1 is the original x, x2 is when mentioned in the closure,
	// and x3 is when mentioned in the closure in the closure.
	//
	// We keep these linked (assume N > 1):
	//
	//   - x1.Defn = original declaration statement for x (like most variables)
	//   - x1.Innermost = current innermost closure x (in this case x3), or nil for none
	//   - x1.IsClosureVar() = false
	//
	//   - xN.Defn = x1, N > 1
	//   - xN.IsClosureVar() = true, N > 1
	//   - x2.Outer = nil
	//   - xN.Outer = x(N-1), N > 2
	//
	//
	// When we look up x in the symbol table, we always get x1.
	// Then we can use x1.Innermost (if not nil) to get the x
	// for the innermost known closure function,
	// but the first reference in a closure will find either no x1.Innermost
	// or an x1.Innermost with .Funcdepth < Funcdepth.
	// In that case, a new xN must be created, linked in with:
	//
	//     xN.Defn = x1
	//     xN.Outer = x1.Innermost
	//     x1.Innermost = xN
	//
	// When we finish the function, we'll process its closure variables
	// and find xN and pop it off the list using:
	//
	//     x1 := xN.Defn
	//     x1.Innermost = xN.Outer
	//
	// We leave xN.Innermost set so that we can still get to the original
	// variable quickly. Not shown here, but once we're
	// done parsing a function and no longer need xN.Outer for the
	// lexical x reference links as described above, closurebody
	// recomputes xN.Outer as the semantic x reference link tree,
	// even filling in x in intermediate closures that might not
	// have mentioned it along the way to inner closures that did.
	// See closurebody for details.
	//
	// During the eventual compilation, then, for closure variables we have:
	//
	//     xN.Defn = original variable
	//     xN.Outer = variable captured in next outward scope
	//                to make closure where xN appears
	//
	// Because of the sharding of pieces of the node, x.Defn means x.Name.Defn
	// and x.Innermost/Outer means x.Name.Param.Innermost/Outer.
	Innermost *Node
	Outer     *Node

	// OTYPE
	//
	// TODO: Should Func pragmas also be stored on the Name?
	Pragma syntax.Pragma
	Alias  bool // node is alias for Ntype (only used when type-checking ODCLTYPE)
}

type Progs added in go1.9 

type Progs struct {
	Text *obj.Prog // ATEXT Prog for this function
	// contains filtered or unexported fields
}

Progs accumulates Progs for a function and converts them into machine code.

func (*Progs) Appendpp added in go1.9 

func (pp *Progs) Appendpp(p *obj.Prog, as obj.As, ftype obj.AddrType, freg int16, foffset int64, ttype obj.AddrType, treg int16, toffset int64) *obj.Prog

func (*Progs) Flush added in go1.9 

func (pp *Progs) Flush()

Flush converts from pp to machine code.

func (*Progs) Free added in go1.9 

func (pp *Progs) Free()

Free clears pp and any associated resources.

func (*Progs) NewProg added in go1.9 

func (pp *Progs) NewProg() *obj.Prog

func (*Progs) Prog added in go1.9 

func (pp *Progs) Prog(as obj.As) *obj.Prog

Prog adds a Prog with instruction As to pp.

type SSAGenState added in go1.7 

type SSAGenState struct {

	// Branches remembers all the branch instructions we've seen
	// and where they would like to go.
	Branches []Branch

	// 387 port: maps from SSE registers (REG_X?) to 387 registers (REG_F?)
	SSEto387 map[int16]int16
	// Some architectures require a 64-bit temporary for FP-related register shuffling. Examples include x86-387, PPC, and Sparc V8.
	ScratchFpMem *Node

	// wasm: The number of values on the WebAssembly stack. This is only used as a safeguard.
	OnWasmStackSkipped int
	// contains filtered or unexported fields
}

SSAGenState contains state needed during Prog generation.

func (*SSAGenState) AddrScratch added in go1.8 

func (s *SSAGenState) AddrScratch(a *obj.Addr)

func (*SSAGenState) Br added in go1.11 

func (s *SSAGenState) Br(op obj.As, target *ssa.Block) *obj.Prog

Br emits a single branch instruction and returns the instruction. Not all architectures need the returned instruction, but otherwise the boilerplate is common to all.

func (*SSAGenState) Call added in go1.9 

func (s *SSAGenState) Call(v *ssa.Value) *obj.Prog

Call returns a new CALL instruction for the SSA value v. It uses PrepareCall to prepare the call.

func (*SSAGenState) DebugFriendlySetPosFrom added in go1.9 

func (s *SSAGenState) DebugFriendlySetPosFrom(v *ssa.Value)

DebugFriendlySetPosFrom adjusts Pos.IsStmt subject to heuristics that reduce "jumpy" line number churn when debugging. Spill/fill/copy instructions from the register allocator, phi functions, and instructions with a no-pos position are examples of instructions that can cause churn.

func (*SSAGenState) FPJump added in go1.9 

func (s *SSAGenState) FPJump(b, next *ssa.Block, jumps *[2][2]FloatingEQNEJump)

func (*SSAGenState) Pc added in go1.7 

func (s *SSAGenState) Pc() *obj.Prog

Pc returns the current Prog.

func (*SSAGenState) PrepareCall added in go1.11 

func (s *SSAGenState) PrepareCall(v *ssa.Value)

PrepareCall prepares to emit a CALL instruction for v and does call-related bookkeeping. It must be called immediately before emitting the actual CALL instruction, since it emits PCDATA for the stack map at the call (calls are safe points).

func (*SSAGenState) Prog added in go1.9 

func (s *SSAGenState) Prog(as obj.As) *obj.Prog

Prog appends a new Prog.

func (*SSAGenState) SetPos added in go1.9 

func (s *SSAGenState) SetPos(pos src.XPos)

SetPos sets the current source position.

func (*SSAGenState) UseArgs added in go1.13 

func (s *SSAGenState) UseArgs(n int64)

UseArgs records the fact that an instruction needs a certain amount of callee args space for its use.

type ScopeID added in go1.9 

type ScopeID int32

A ScopeID represents a lexical scope within a function.

type Sig 

type Sig struct {
	// contains filtered or unexported fields
}
type Symlink struct {
	// contains filtered or unexported fields
}

type Timings added in go1.8 

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

Timings collects the execution times of labeled phases which are added trough a sequence of Start/Stop calls. Events may be associated with each phase via AddEvent.

func (*Timings) AddEvent added in go1.8 

func (t *Timings) AddEvent(size int64, unit string)

AddEvent associates an event, i.e., a count, or an amount of data, with the most recently started or stopped phase; or the very first phase if Start or Stop hasn't been called yet. The unit specifies the unit of measurement (e.g., MB, lines, no. of funcs, etc.).

func (*Timings) Start added in go1.8 

func (t *Timings) Start(labels ...string)

Start marks the beginning of a new phase and implicitly stops the previous phase. The phase name is the colon-separated concatenation of the labels.

func (*Timings) Stop added in go1.8 

func (t *Timings) Stop(labels ...string)

Stop marks the end of a phase and implicitly starts a new phase. The labels are added to the labels of the ended phase.

func (*Timings) Write added in go1.8 

func (t *Timings) Write(w io.Writer, prefix string)

Write prints the phase times to w. The prefix is printed at the start of each line.

type Val 

type Val struct {
	// U contains one of:
	// bool     bool when Ctype() == CTBOOL
	// *Mpint   int when Ctype() == CTINT, rune when Ctype() == CTRUNE
	// *Mpflt   float when Ctype() == CTFLT
	// *Mpcplx  pair of floats when Ctype() == CTCPLX
	// string   string when Ctype() == CTSTR
	// *Nilval  when Ctype() == CTNIL
	U interface{}
}

func (Val) Ctype 

func (v Val) Ctype() Ctype

func (Val) Format added in go1.8 

func (v Val) Format(s fmt.State, verb rune)

func (Val) Interface added in go1.8 

func (v Val) Interface() interface{}

Interface returns the constant value stored in v as an interface{}. It returns int64s for ints and runes, float64s for floats, complex128s for complex values, and nil for constant nils.

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