Golang Node.Left方法代碼示例

/*
 * generate:
 *	res = &n;
 * The generated code checks that the result is not nil.
 */
func agen(n *gc.Node, res *gc.Node) {
	if gc.Debug['g'] != 0 {
		gc.Dump("\nagen-res", res)
		gc.Dump("agen-r", n)
	}

	if n == nil || n.Type == nil {
		return
	}

	for n.Op == gc.OCONVNOP {
		n = n.Left
	}

	if gc.Isconst(n, gc.CTNIL) && n.Type.Width > int64(gc.Widthptr) {
		// Use of a nil interface or nil slice.
		// Create a temporary we can take the address of and read.
		// The generated code is just going to panic, so it need not
		// be terribly efficient. See issue 3670.
		var n1 gc.Node
		gc.Tempname(&n1, n.Type)

		gc.Gvardef(&n1)
		clearfat(&n1)
		var n2 gc.Node
		regalloc(&n2, gc.Types[gc.Tptr], res)
		var n3 gc.Node
		n3.Op = gc.OADDR
		n3.Left = &n1
		gins(ppc64.AMOVD, &n3, &n2)
		gmove(&n2, res)
		regfree(&n2)
		return
	}

	if n.Addable != 0 {
		var n1 gc.Node
		n1.Op = gc.OADDR
		n1.Left = n
		var n2 gc.Node
		regalloc(&n2, gc.Types[gc.Tptr], res)
		gins(ppc64.AMOVD, &n1, &n2)
		gmove(&n2, res)
		regfree(&n2)
		return
	}

	nl := n.Left

	switch n.Op {
	default:
		gc.Fatal("agen: unknown op %v", gc.Nconv(n, obj.FmtShort|obj.FmtSign))

		// TODO(minux): 5g has this: Release res so that it is available for cgen_call.
	// Pick it up again after the call for OCALLMETH and OCALLFUNC.
	case gc.OCALLMETH:
		gc.Cgen_callmeth(n, 0)

		cgen_aret(n, res)

	case gc.OCALLINTER:
		cgen_callinter(n, res, 0)
		cgen_aret(n, res)

	case gc.OCALLFUNC:
		cgen_call(n, 0)
		cgen_aret(n, res)

	case gc.OSLICE,
		gc.OSLICEARR,
		gc.OSLICESTR,
		gc.OSLICE3,
		gc.OSLICE3ARR:
		var n1 gc.Node
		gc.Tempname(&n1, n.Type)
		gc.Cgen_slice(n, &n1)
		agen(&n1, res)

	case gc.OEFACE:
		var n1 gc.Node
		gc.Tempname(&n1, n.Type)
		gc.Cgen_eface(n, &n1)
		agen(&n1, res)

	case gc.OINDEX:
		var n1 gc.Node
		agenr(n, &n1, res)
		gmove(&n1, res)
		regfree(&n1)

		// should only get here with names in this func.
	case gc.ONAME:
		if n.Funcdepth > 0 && n.Funcdepth != gc.Funcdepth {
			gc.Dump("bad agen", n)
			gc.Fatal("agen: bad ONAME funcdepth %d != %d", n.Funcdepth, gc.Funcdepth)
//.........這裏部分代碼省略.........

/*
 * generate:
 *	newreg = &n;
 *
 * caller must regfree(a).
 * The generated code checks that the result is not nil.
 */
func agenr(n *gc.Node, a *gc.Node, res *gc.Node) {
	if gc.Debug['g'] != 0 {
		gc.Dump("agenr-n", n)
	}

	nl := n.Left
	nr := n.Right

	switch n.Op {
	case gc.ODOT,
		gc.ODOTPTR,
		gc.OCALLFUNC,
		gc.OCALLMETH,
		gc.OCALLINTER:
		var n1 gc.Node
		igen(n, &n1, res)
		regalloc(a, gc.Types[gc.Tptr], &n1)
		agen(&n1, a)
		regfree(&n1)

	case gc.OIND:
		cgenr(n.Left, a, res)
		gc.Cgen_checknil(a)

	case gc.OINDEX:
		var p2 *obj.Prog // to be patched to panicindex.
		w := uint32(n.Type.Width)
		bounded := gc.Debug['B'] != 0 || n.Bounded
		var n1 gc.Node
		var n3 gc.Node
		if nr.Addable != 0 {
			var tmp gc.Node
			if !gc.Isconst(nr, gc.CTINT) {
				gc.Tempname(&tmp, gc.Types[gc.TINT32])
			}
			if !gc.Isconst(nl, gc.CTSTR) {
				agenr(nl, &n3, res)
			}
			if !gc.Isconst(nr, gc.CTINT) {
				p2 = cgenindex(nr, &tmp, bounded)
				regalloc(&n1, tmp.Type, nil)
				gmove(&tmp, &n1)
			}
		} else if nl.Addable != 0 {
			if !gc.Isconst(nr, gc.CTINT) {
				var tmp gc.Node
				gc.Tempname(&tmp, gc.Types[gc.TINT32])
				p2 = cgenindex(nr, &tmp, bounded)
				regalloc(&n1, tmp.Type, nil)
				gmove(&tmp, &n1)
			}

			if !gc.Isconst(nl, gc.CTSTR) {
				agenr(nl, &n3, res)
			}
		} else {
			var tmp gc.Node
			gc.Tempname(&tmp, gc.Types[gc.TINT32])
			p2 = cgenindex(nr, &tmp, bounded)
			nr = &tmp
			if !gc.Isconst(nl, gc.CTSTR) {
				agenr(nl, &n3, res)
			}
			regalloc(&n1, tmp.Type, nil)
			gins(optoas(gc.OAS, tmp.Type), &tmp, &n1)
		}

		// &a is in &n3 (allocated in res)
		// i is in &n1 (if not constant)
		// w is width

		// constant index
		if gc.Isconst(nr, gc.CTINT) {
			if gc.Isconst(nl, gc.CTSTR) {
				gc.Fatal("constant string constant index")
			}
			v := uint64(gc.Mpgetfix(nr.Val.U.Xval))
			var n2 gc.Node
			if gc.Isslice(nl.Type) || nl.Type.Etype == gc.TSTRING {
				if gc.Debug['B'] == 0 && !n.Bounded {
					n1 = n3
					n1.Op = gc.OINDREG
					n1.Type = gc.Types[gc.Tptr]
					n1.Xoffset = int64(gc.Array_nel)
					var n4 gc.Node
					regalloc(&n4, n1.Type, nil)
					gmove(&n1, &n4)
					gc.Nodconst(&n2, gc.Types[gc.TUINT32], int64(v))
					gcmp(optoas(gc.OCMP, gc.Types[gc.TUINT32]), &n4, &n2)
					regfree(&n4)
					p1 := gc.Gbranch(optoas(gc.OGT, gc.Types[gc.TUINT32]), nil, +1)
					ginscall(gc.Panicindex, 0)
					gc.Patch(p1, gc.Pc)
//.........這裏部分代碼省略.........