}

// asmPCData assembles a PCDATA pseudo-op.
// PCDATA $2, $705
func (p *Parser) asmPCData(operands [][]lex.Token) {
	if len(operands) != 2 {
		p.errorf("expect two operands for PCDATA")
		return
	}

	// Operand 0 must be an immediate constant.
	key := p.address(operands[0])
	if !p.validImmediate("PCDATA", &key) {
		return
	}

	// we are still in function prologue. We need to fix the
	// SP data and PCDATA.
	spfix := obj.Appendp(p, c.newprog)
	spfix.As = obj.ANOP
	spfix.Spadj = -framesize

	pcdata := c.ctxt.EmitEntryStackMap(c.cursym, spfix, c.newprog)
	pcdata = c.ctxt.StartUnsafePoint(pcdata, c.newprog)

	// MOVD	LR, R5
	p = obj.Appendp(pcdata, c.newprog)
	pPre.To.SetTarget(p)
	p.As = AMOVD
	p.From.Type = obj.TYPE_REG

// whose argument size is unknown (C vararg functions, and
// assembly code without an explicit specification).
// This value is generated by the compiler, assembler, or linker.
const ArgsSizeUnknown = -0x80000000

// IDs for PCDATA and FUNCDATA tables in Go binaries.
//
// These must agree with ../../../runtime/funcdata.h.
const (
	PCDATA_UnsafePoint   = 0
	PCDATA_StackMapIndex = 1
	PCDATA_InlTreeIndex  = 2
	PCDATA_ArgLiveIndex  = 3

// list for the function arguments. Both lists are indexed by the same PCDATA
// index, so the corresponding pairs must be considered together when
// merging duplicates. The argument bitmaps change much less often during
// function execution than the local variable bitmaps, so it is possible that
// we could introduce a separate PCDATA index for arguments vs locals and

	// we are still in function prologue. We need to fix the
	// SP data and PCDATA.
	spfix := obj.Appendp(last, newprog)
	spfix.As = obj.ANOP
	spfix.Spadj = -framesize

	pcdata := ctxt.EmitEntryStackMap(cursym, spfix, newprog)
	spill := ctxt.StartUnsafePoint(pcdata, newprog)
	pcdata = cursym.Func().SpillRegisterArgs(spill, newprog)

	call := obj.Appendp(pcdata, newprog)
	call.Pos = cursym.Func().Text.Pos
	call.As = obj.ACALL

	0x003e 00062 (x.go:5)	ADDQ	$16, SP
	0x0042 00066 (x.go:5)	RET
	0x0043 00067 (x.go:5)	NOP
	0x0043 00067 (x.go:3)	PCDATA	$1, $-1
	0x0043 00067 (x.go:3)	PCDATA	$0, $-1
	0x0043 00067 (x.go:3)	CALL	runtime.morestack_noctxt(SB)
	0x0048 00072 (x.go:3)	JMP	0
...
</pre>

<p>
The <code>FUNCDATA</code> and <code>PCDATA</code> directives contain information
for use by the garbage collector; they are introduced by the compiler.
</p>

<p>

	// arrays that reference the pcdata and funcdata locations for this
	// function.

	// pcdata contains the offset into moduledata.pctab for the start of
	// that index's table. e.g.,
	// &moduledata.pctab[_func.pcdata[_PCDATA_UnsafePoint]] is the start of
	// the unsafe point table.
	//
	// An offset of 0 indicates that there is no table.
	//
	// pcdata [npcdata]uint32

			w.aux1(goobj.AuxPcinline, fn.Pcln.Pcinline)
		}
		if fn.sehUnwindInfoSym != nil && fn.sehUnwindInfoSym.Size != 0 {
			w.aux1(goobj.AuxSehUnwindInfo, fn.sehUnwindInfoSym)
		}
		for _, pcSym := range fn.Pcln.Pcdata {
			w.aux1(goobj.AuxPcdata, pcSym)
		}
		if fn.WasmImportSym != nil {
			if fn.WasmImportSym.Size == 0 {
				panic("wasmimport aux sym must have non-zero size")
			}

			// work correctly for entries in the result of runtime.Callers.
			pc--
		}
		// It's important that interpret pc non-strictly as cgoTraceback may
		// have added bogus PCs with a valid funcInfo but invalid PCDATA.
		u, uf := newInlineUnwinder(funcInfo, pc)
		sf := u.srcFunc(uf)
		if u.isInlined(uf) {
			// Note: entry is not modified. It always refers to a real frame, not an inlined one.

func (l *Loader) Pcsp(i Sym) Sym { return l.aux1(i, goobj.AuxPcsp) }

// Returns all aux symbols of per-PC data for symbol i.
// tmp is a scratch space for the pcdata slice.
func (l *Loader) PcdataAuxs(i Sym, tmp []Sym) (pcsp, pcfile, pcline, pcinline Sym, pcdata []Sym) {
	pcdata = tmp[:0]
	r, auxs := l.auxs(i)
	for j := range auxs {
		a := &auxs[j]
		switch a.Type() {
		case goobj.AuxPcsp:
			pcsp = l.resolve(r, a.Sym())