name string
	op   ir.Op
}{
	{"append", ir.OAPPEND},
	{"cap", ir.OCAP},
	{"clear", ir.OCLEAR},
	{"close", ir.OCLOSE},
	{"complex", ir.OCOMPLEX},
	{"copy", ir.OCOPY},
	{"delete", ir.ODELETE},
	{"imag", ir.OIMAG},
	{"len", ir.OLEN},
	{"make", ir.OMAKE},
	{"max", ir.OMAX},
	{"min", ir.OMIN},
	{"new", ir.ONEW},
	{"panic", ir.OPANIC},
	{"print", ir.OPRINT},
	{"println", ir.OPRINTLN},

	case ir.OAS,
		ir.OASOP,
		ir.OAS2,
		ir.OAS2DOTTYPE,
		ir.OAS2RECV,
		ir.OAS2FUNC,
		ir.OAS2MAPR,
		ir.OCLEAR,
		ir.OCLOSE,
		ir.OCOPY,
		ir.OCALLINTER,
		ir.OCALL,
		ir.OCALLFUNC,
		ir.ODELETE,
		ir.OSEND,
		ir.OPRINT,
		ir.OPRINTLN,
		ir.OPANIC,
		ir.ORECOVERFP,
		ir.OGETG:
		if n.Typecheck() == 0 {
			base.Fatalf("missing typecheck: %+v", n)
		}

		init := ir.TakeInit(n)

	OCASE:             "case",
	OCLEAR:            "clear",
	OCLOSE:            "close",
	OCOMPLEX:          "complex",
	OBITNOT:           "^",
	OCONTINUE:         "continue",
	OCOPY:             "copy",
	ODELETE:           "delete",
	ODEFER:            "defer",
	ODIV:              "/",
	OEQ:               "==",
	OFALL:             "fallthrough",
	OFOR:              "for",
	OGE:               ">=",
	OGOTO:             "goto",

// an expression that yields the *runtime._type value representing the
// map type.
func DeleteMapRType(pos src.XPos, n *ir.CallExpr) ir.Node {
	assertOp(n, ir.ODELETE)
	if hasRType(n, n.RType, "RType") {
		return n.RType
	}
	return mapRType(pos, n.Args[0].Type())
}

// IndexMapRType asserts that n is a map index operation, and returns

	switch n.Op() {
	case ir.OAPPEND,
		ir.OCALL,
		ir.OCALLFUNC,
		ir.OCALLINTER,
		ir.OCALLMETH,
		ir.OCAP,
		ir.OCLEAR,
		ir.OCLOSE,
		ir.OCOMPLEX,
		ir.OCOPY,
		ir.ODELETE,
		ir.OIMAG,
		ir.OLEN,
		ir.OMAKE,
		ir.OMAX,
		ir.OMIN,
		ir.ONEW,
		ir.OPANIC,
		ir.OPRINT,
		ir.OPRINTLN,
		ir.OREAL,
		ir.ORECOVER,
		ir.ORECOVERFP,
		ir.ORECV,

		return tcComplex(n)

	case ir.OCLEAR:
		n := n.(*ir.UnaryExpr)
		return tcClear(n)

	case ir.OCLOSE:
		n := n.(*ir.UnaryExpr)
		return tcClose(n)

	case ir.ODELETE:
		n := n.(*ir.CallExpr)
		return tcDelete(n)

	case ir.OAPPEND:
		n := n.(*ir.CallExpr)
		return tcAppend(n)

	case ir.OCOPY:
		n := n.(*ir.BinaryExpr)
		return tcCopy(n)

	case ir.OCONV:

		}

		realOut = out
		out = out + ".o"

	case "c-shared":
		ldflags = append(ldflags, "-shared", "-nostdlib")
		if cfg.Goos != "windows" {
			ldflags = append(ldflags, "-Wl,-z,nodelete")
		}
		ldflags = append(ldflags, goLibBegin...)
		ldflags = append(ldflags, "-lgo", "-lgcc_s", "-lgcc", "-lc", "-lgcc")

	case "shared":
		if cfg.Goos != "aix" {
			ldflags = append(ldflags, "-zdefs")

	case ir.OCALLINTER:
		call := call.(*ir.CallExpr)
		argps = append(argps, &call.Fun.(*ir.SelectorExpr).X) // must be first for OCHECKNIL; see below
		visitList(call.Args)

	case ir.OAPPEND, ir.ODELETE, ir.OPRINT, ir.OPRINTLN, ir.ORECOVERFP:
		call := call.(*ir.CallExpr)
		visitList(call.Args)
		visit(&call.RType)

	case ir.OCOPY:
		call := call.(*ir.BinaryExpr)
		visit(&call.X)
		visit(&call.Y)

	if !ir.DeclaredBy(k, n) {
		return false
	}

	if len(n.Body) != 1 {
		return false
	}

	stmt := n.Body[0] // only stmt in body
	if stmt == nil || stmt.Op() != ir.ODELETE {
		return false
	}

	m := n.X
	if delete := stmt.(*ir.CallExpr); !ir.SameSafeExpr(delete.Args[0], m) || !ir.SameSafeExpr(delete.Args[1], k) {
		return false
	}

for(let i=0,l=toDelete.length;i<l;++i)tree.remove(toDelete[i]);};CodeMap.prototype.isAddressBelongsTo_=function(addr,node){return addr>=node.key&&addr<(node.key+nod...