Documentation

Index

Constants

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const (
	H0 = 2166136261
	Hp = 16777619
)

FNV-1 hash function constants.

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const (
	EscFuncUnknown = 0 + iota
	EscFuncPlanned
	EscFuncStarted
	EscFuncTagged
)
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const (
	EscUnknown = iota
	EscNone    // Does not escape to heap, result, or parameters.
	EscHeap    // Reachable from the heap
	EscNever   // By construction will not escape.
)
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const (
	FErr fmtMode = 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

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const (
	InitNotStarted = iota
	InitDone
	InitPending
)

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

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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
)
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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.

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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

	NTYPE = types.NTYPE
)

convenience constants

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const ArhdrSize = 60

architecture-independent object file output

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const (
	BADWIDTH = types.BADWIDTH
)
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const StackMapDontCare = -1000

StackMapDontCare indicates that the stack map index at a Value doesn't matter.

This is a sentinel value that should never be emitted to the PCDATA stream. We use -1000 because that's obviously never a valid stack index (but -1 is).

Variables

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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
)
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var (
	Debug_append       int
	Debug_checkptr     int
	Debug_closure      int
	Debug_compilelater int

	Debug_libfuzzer    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
	Debug_defer        int
)
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var Ctxt *obj.Link
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var Debug [256]int
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var Debug_checknil int
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var (
	Debug_export int // if set, print debugging information about export data
)
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var Debug_gcprog int // set by -d gcprog
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var Debug_typeassert int
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var GCWriteBarrierReg map[int16]*obj.LSym

GCWriteBarrierReg maps from registers to gcWriteBarrier implementation LSyms.

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var LivenessInvalid = LivenessIndex{StackMapDontCare, StackMapDontCare, true} // only for !go115ReduceLiveness

LivenessInvalid indicates an unsafe point with no stack map.

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var Runtimepkg *types.Pkg // fake package runtime
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var Widthptr int
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var Widthreg int

Functions

func AddAux

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

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

func AddrAuto

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

func Addrconst

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

func CheckLoweredGetClosurePtr

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

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 EqCanPanic

func EqCanPanic(t *types.Type) bool

EqCanPanic reports whether == on type t could panic (has an interface somewhere). t must be comparable.

func Exit

func Exit(code int)

func Fatalf

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

func IncomparableField

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

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

func IsAlias

func IsAlias(sym *types.Sym) bool

func IsComparable

func IsComparable(t *types.Type) bool

IsComparable reports whether t is a comparable type.

func IsRegularMemory

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

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
)

func (AlgKind) String

func (i AlgKind) String() string

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 zeroes a range of memory on stack. It is only inserted
	// at function entry, and it is ok to clobber registers.
	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)
}

type BlockEffects

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

BlockEffects summarizes the liveness effects on an SSA block.

type Branch

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

Branch is an unresolved branch.

type Class

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

)

go:generate stringer -type=Class

func (Class) String

func (i Class) String() string

type Ctype

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

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

An EscEdge represents an assignment edge between two Go variables.

type EscHole

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 EscLeaks

type EscLeaks [1 + numEscResults]uint8

An EscLeaks represents a set of assignment flows from a parameter to the heap or to any of its function's (first numEscResults) result parameters.

func ParseLeaks

func ParseLeaks(s string) EscLeaks

ParseLeaks parses a binary string representing an EscLeaks.

func (*EscLeaks) AddHeap

func (l *EscLeaks) AddHeap(derefs int)

AddHeap adds an assignment flow from l to the heap.

func (*EscLeaks) AddResult

func (l *EscLeaks) AddResult(i, derefs int)

AddResult adds an assignment flow from l to its function's i'th result parameter.

func (EscLeaks) Empty

func (l EscLeaks) Empty() bool

Empty reports whether l is an empty set (i.e., no assignment flows).

func (EscLeaks) Encode

func (l EscLeaks) Encode() string

Encode converts l into a binary string for export data.

func (EscLeaks) Heap

func (l EscLeaks) Heap() int

Heap returns the minimum deref count of any assignment flow from l to the heap. If no such flows exist, Heap returns -1.

func (*EscLeaks) Optimize

func (l *EscLeaks) Optimize()

Optimize removes result flow paths that are equal in length or longer than the shortest heap flow path.

func (EscLeaks) Result

func (l EscLeaks) Result(i int) int

Result returns the minimum deref count of any assignment flow from l to its function's i'th result parameter. If no such flows exist, Result returns -1.

type EscLocation

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

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

type EscNote

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

type Escape

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

type FmtFlag

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 PragmaFlag // 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

func (f *Func) ExportInline() bool

func (*Func) HasDefer

func (f *Func) HasDefer() bool

func (*Func) InlinabilityChecked

func (f *Func) InlinabilityChecked() bool

func (*Func) InstrumentBody

func (f *Func) InstrumentBody() bool

func (*Func) IsHiddenClosure

func (f *Func) IsHiddenClosure() bool

func (*Func) Needctxt

func (f *Func) Needctxt() bool

func (*Func) NilCheckDisabled

func (f *Func) NilCheckDisabled() bool

func (*Func) OpenCodedDeferDisallowed

func (f *Func) OpenCodedDeferDisallowed() bool

func (*Func) ReflectMethod

func (f *Func) ReflectMethod() bool

func (*Func) SetDupok

func (f *Func) SetDupok(b bool)

func (*Func) SetExportInline

func (f *Func) SetExportInline(b bool)

func (*Func) SetHasDefer

func (f *Func) SetHasDefer(b bool)

func (*Func) SetInlinabilityChecked

func (f *Func) SetInlinabilityChecked(b bool)

func (*Func) SetInstrumentBody

func (f *Func) SetInstrumentBody(b bool)

func (*Func) SetIsHiddenClosure

func (f *Func) SetIsHiddenClosure(b bool)

func (*Func) SetNeedctxt

func (f *Func) SetNeedctxt(b bool)

func (*Func) SetNilCheckDisabled

func (f *Func) SetNilCheckDisabled(b bool)

func (*Func) SetOpenCodedDeferDisallowed

func (f *Func) SetOpenCodedDeferDisallowed(b bool)

func (*Func) SetReflectMethod

func (f *Func) SetReflectMethod(b bool)

func (*Func) SetWrapper

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 IndexJump

type IndexJump struct {
	Jump  obj.As
	Index int
}

For generating consecutive jump instructions to model a specific branching

type InitEntry

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

type InitOrder

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

type InitPlan

type InitPlan struct {
	E []InitEntry
}

type InitSchedule

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

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 Liveness

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

A collection of global state used by liveness analysis.

type LivenessIndex

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

LivenessIndex stores the liveness map information for a Value.

func (LivenessIndex) RegMapValid

func (idx LivenessIndex) RegMapValid() bool

func (LivenessIndex) StackMapValid

func (idx LivenessIndex) StackMapValid() bool

type LivenessMap

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

LivenessMap maps from *ssa.Value to LivenessIndex.

func (LivenessMap) Get

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

type Mark

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

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

func (v *Mpcplx) GoString() string

func (*Mpcplx) Mul

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

func (v *Mpcplx) String() string

type Mpflt

type Mpflt struct {
	Val big.Float
}

Mpflt represents a floating-point constant.

func (*Mpflt) Add

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

func (*Mpflt) AddFloat64

func (a *Mpflt) AddFloat64(c float64)

func (*Mpflt) Cmp

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

func (*Mpflt) CmpFloat64

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

func (*Mpflt) Float32

func (a *Mpflt) Float32() float64

func (*Mpflt) Float64

func (a *Mpflt) Float64() float64

func (*Mpflt) GoString

func (fvp *Mpflt) GoString() string

func (*Mpflt) Mul

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

func (*Mpflt) MulFloat64

func (a *Mpflt) MulFloat64(c float64)

func (*Mpflt) Neg

func (a *Mpflt) Neg()

func (*Mpflt) Quo

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

func (*Mpflt) Set

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

func (*Mpflt) SetFloat64

func (a *Mpflt) SetFloat64(c float64)

func (*Mpflt) SetInt

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

func (*Mpflt) SetString

func (a *Mpflt) SetString(as string)

func (*Mpflt) String

func (f *Mpflt) String() string

func (*Mpflt) Sub

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

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

func (*Mpint) And

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

func (*Mpint) AndNot

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

func (*Mpint) Cmp

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

func (*Mpint) CmpInt64

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

func (*Mpint) GoString

func (a *Mpint) GoString() string

func (*Mpint) Int64

func (a *Mpint) Int64() int64

func (*Mpint) Lsh

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

func (*Mpint) Mul

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

func (*Mpint) Neg

func (a *Mpint) Neg()

func (*Mpint) Or

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

func (*Mpint) Quo

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

func (*Mpint) Rem

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

func (*Mpint) Rsh

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

func (*Mpint) Set

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

func (*Mpint) SetFloat

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

func (*Mpint) SetInt64

func (a *Mpint) SetInt64(c int64)

func (*Mpint) SetOverflow

func (a *Mpint) SetOverflow()

func (*Mpint) SetString

func (a *Mpint) SetString(as string)

func (*Mpint) String

func (a *Mpint) String() string

func (*Mpint) Sub

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

func (*Mpint) Xor

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) Addrtaken

func (n *Name) Addrtaken() bool

func (*Name) Assigned

func (n *Name) Assigned() bool

func (*Name) AutoTemp

func (n *Name) AutoTemp() bool

func (*Name) Byval

func (n *Name) Byval() bool

func (*Name) Captured

func (n *Name) Captured() bool

func (*Name) InlFormal

func (n *Name) InlFormal() bool

func (*Name) InlLocal

func (n *Name) InlLocal() bool

func (*Name) IsClosureVar

func (n *Name) IsClosureVar() bool

func (*Name) IsOutputParamHeapAddr

func (n *Name) IsOutputParamHeapAddr() bool

func (*Name) Keepalive

func (n *Name) Keepalive() bool

func (*Name) LibfuzzerExtraCounter

func (n *Name) LibfuzzerExtraCounter() bool

func (*Name) Needzero

func (n *Name) Needzero() bool

func (*Name) OpenDeferSlot

func (n *Name) OpenDeferSlot() bool

func (*Name) Readonly

func (n *Name) Readonly() bool

func (*Name) SetAddrtaken

func (n *Name) SetAddrtaken(b bool)

func (*Name) SetAssigned

func (n *Name) SetAssigned(b bool)

func (*Name) SetAutoTemp

func (n *Name) SetAutoTemp(b bool)

func (*Name) SetByval

func (n *Name) SetByval(b bool)

func (*Name) SetCaptured

func (n *Name) SetCaptured(b bool)

func (*Name) SetInlFormal

func (n *Name) SetInlFormal(b bool)

func (*Name) SetInlLocal

func (n *Name) SetInlLocal(b bool)

func (*Name) SetIsClosureVar

func (n *Name) SetIsClosureVar(b bool)

func (*Name) SetIsOutputParamHeapAddr

func (n *Name) SetIsOutputParamHeapAddr(b bool)

func (*Name) SetKeepalive

func (n *Name) SetKeepalive(b bool)

func (*Name) SetLibfuzzerExtraCounter

func (n *Name) SetLibfuzzerExtraCounter(b bool)

func (*Name) SetNeedzero

func (n *Name) SetNeedzero(b bool)

func (*Name) SetOpenDeferSlot

func (n *Name) SetOpenDeferSlot(b bool)

func (*Name) SetReadonly

func (n *Name) SetReadonly(b bool)

func (*Name) SetUsed

func (n *Name) SetUsed(b bool)

func (*Name) Used

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.
	// - OCLOSURE uses it to store ambient iota value, if any.
	// 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

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) 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) CanBeAnSSASym

func (n *Node) CanBeAnSSASym()

The compiler needs *Node to be assignable to cmd/compile/internal/ssa.Sym.

func (*Node) CanInt64

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

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

func (*Node) HasBreak

func (n *Node) HasBreak() bool

func (*Node) HasCall

func (n *Node) HasCall() bool

func (*Node) HasOpt

func (n *Node) HasOpt() bool

func (*Node) HasVal

func (n *Node) HasVal() bool

func (*Node) Implicit

func (n *Node) Implicit() bool

func (*Node) IndexMapLValue

func (n *Node) IndexMapLValue() bool

func (*Node) Initorder

func (n *Node) Initorder() uint8

func (*Node) Int64

func (n *Node) Int64() int64

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

func (*Node) Iota

func (n *Node) Iota() int64

func (*Node) IsAutoTmp

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) IsDDD

func (n *Node) IsDDD() bool

func (*Node) IsMethod

func (n *Node) IsMethod() bool

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

func (*Node) IsSynthetic

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) MarkNonNil

func (n *Node) MarkNonNil()

MarkNonNil marks a pointer n as being guaranteed non-nil, on all code paths, at all times. During conversion to SSA, non-nil pointers won't have nil checks inserted before dereferencing. See state.exprPtr.

func (*Node) MarkReadonly

func (n *Node) MarkReadonly()

MarkReadonly indicates that n is an ONAME with readonly contents.

func (*Node) NoInline

func (n *Node) NoInline() bool

func (*Node) NonNil

func (n *Node) NonNil() bool

func (*Node) Opt

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

Opt returns the optimizer data for the node.

func (*Node) ResetAux

func (n *Node) ResetAux()

func (*Node) SetBounded

func (n *Node) SetBounded(b bool)

SetBounded indicates whether operation n does not need safety checks. When n is an index or slice operation, n does not need bounds checks. When n is a dereferencing operation, n does not need nil checks. When n is a makeslice+copy operation, n does not need length and cap checks.

func (*Node) SetClass

func (n *Node) SetClass(b Class)

func (*Node) SetColas

func (n *Node) SetColas(b bool)

func (*Node) SetDiag

func (n *Node) SetDiag(b bool)

func (*Node) SetEmbedded

func (n *Node) SetEmbedded(b bool)

func (*Node) SetHasBreak

func (n *Node) SetHasBreak(b bool)

func (*Node) SetHasCall

func (n *Node) SetHasCall(b bool)

func (*Node) SetHasOpt

func (n *Node) SetHasOpt(b bool)

func (*Node) SetHasVal

func (n *Node) SetHasVal(b bool)

func (*Node) SetImplicit

func (n *Node) SetImplicit(b bool)

func (*Node) SetIndexMapLValue

func (n *Node) SetIndexMapLValue(b bool)

func (*Node) SetInitorder

func (n *Node) SetInitorder(b uint8)

func (*Node) SetIota

func (n *Node) SetIota(x int64)

func (*Node) SetIsDDD

func (n *Node) SetIsDDD(b bool)

func (*Node) SetLikely

func (n *Node) SetLikely(b bool)

func (*Node) SetNoInline

func (n *Node) SetNoInline(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

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

func (n *Node) SetSubOp(op Op)

func (*Node) SetTChanDir

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

func (*Node) SetTransient

func (n *Node) SetTransient(b bool)

func (*Node) SetTypecheck

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

func (n *Node) SetWalkdef(b uint8)

func (*Node) SliceBounds

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

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

func (*Node) String

func (n *Node) String() string

func (*Node) SubOp

func (n *Node) SubOp() Op

func (*Node) TChanDir

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

func (*Node) Transient

func (n *Node) Transient() bool

func (*Node) Typ

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 NodeSet

type NodeSet map[*Node]struct{}

NodeSet is a set of Nodes.

func (*NodeSet) Add

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

Add adds n to s.

func (NodeSet) Has

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

Has reports whether s contains n.

func (NodeSet) Sorted

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

Sorted returns s sorted according to less.

type Nodes

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

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

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

Append appends entries to Nodes.

func (*Nodes) AppendNodes

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

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

func (Nodes) First

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

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

func (Nodes) Index

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

func (n Nodes) Len() int

Len returns the number of entries in Nodes.

func (*Nodes) MoveNodes

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

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

func (*Nodes) Prepend

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

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

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

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

func (*Nodes) Set1

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

Set1 sets n to a slice containing a single node.

func (*Nodes) Set2

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

Set2 sets n to a slice containing two nodes.

func (*Nodes) Set3

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

Set3 sets n to a slice containing three nodes.

func (Nodes) SetFirst

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

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

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

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

func (n Nodes) String() string

type Op

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 = Right (x, ok = I.(int))
	OAS2FUNC      // List = Right (x, y = f())
	OAS2MAPR      // List = Right (x, ok = m["foo"])
	OAS2RECV      // List = Right (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.
	// After walk, List is a series of assignments to temporaries,
	// and Rlist is an updated set of arguments.
	// 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)
	OMAKESLICECOPY // makeslicecopy(Type, Left, Right) (type is slice; Left is length and Right is the copied from slice)
	// OMAKESLICECOPY is created by the order pass and corresponds to:
	//  s = make(Type, Left); copy(s, Right)
	//
	// Bounded can be set on the node when Left == len(Right) is known at compile time.
	//
	// This node is created so the walk pass can optimize this pattern which would
	// otherwise be hard to detect after the order pass.
	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: (appears 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 List: Nbody (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 OCASE)
	OSWITCH // switch Ninit; Left { List } (List is a list of 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}.
	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

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

func (Op) GoString

func (o Op) GoString() string

func (Op) IsSlice3

func (o Op) IsSlice3() bool

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

func (Op) String

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 PragmaFlag
	Alias  bool // node is alias for Ntype (only used when type-checking ODCLTYPE)
}

type Pragma

type Pragma struct {
	Flag PragmaFlag  // collected bits
	Pos  []PragmaPos // position of each individual flag
}

*Pragma is the value stored in a syntax.Pragma during parsing.

type PragmaFlag

type PragmaFlag int16
const (
	// Func pragmas.
	Nointerface    PragmaFlag = 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
	NoCheckPtr                // func should not be instrumented by checkptr
	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
)

type PragmaPos

type PragmaPos struct {
	Flag PragmaFlag
	Pos  syntax.Pos
}

type Progs

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

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

func (pp *Progs) Flush()

Flush converts from pp to machine code.

func (*Progs) Free

func (pp *Progs) Free()

Free clears pp and any associated resources.

func (*Progs) NewProg

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

func (*Progs) Prog

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

Prog adds a Prog with instruction As to pp.

type SSAGenState

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

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

func (*SSAGenState) Br

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

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) CombJump

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

CombJump generates combinational instructions (2 at present) for a block jump, thereby the behaviour of non-standard condition codes could be simulated

func (*SSAGenState) DebugFriendlySetPosFrom

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) Pc

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

Pc returns the current Prog.

func (*SSAGenState) PrepareCall

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

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

Prog appends a new Prog.

func (*SSAGenState) SetPos

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

SetPos sets the current source position.

func (*SSAGenState) UseArgs

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

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

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

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

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

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

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

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

func (Val) Interface

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.