)

// A SymEffect describes the effect that an SSA Value has on the variable
// identified by the symbol in its Aux field.
type SymEffect int8

const (
	SymRead SymEffect = 1 << iota
	SymWrite
	SymAddr

	SymRdWr = SymRead | SymWrite

	SymNone SymEffect = 0
)

// A Sym represents a symbolic offset from a base register.
// Currently a Sym can be one of 3 things:

	if v {
		l.attrUsedInIface.Set(i)
	} else {
		l.attrUsedInIface.Unset(i)
	}
}

// SymAddr checks that a symbol is reachable, and returns its value.
func (l *Loader) SymAddr(i Sym) int64 {
	if !l.AttrReachable(i) {
		panic("unreachable symbol in symaddr")
	}
	return l.values[i]
}

// AttrNotInSymbolTable returns true for symbols that should not be

				symtab.AddUint8(0)
			} else {
				symtab.AddUint8(uint8(ldr.SymSect(o).Extnum))
			}
			symtab.AddUint16(ctxt.Arch, 0) // desc
			symtab.AddUintXX(ctxt.Arch, uint64(ldr.SymAddr(s)), ctxt.Arch.PtrSize)
		}
	}
}

func machodysymtab(ctxt *Link, base int64) {
	ml := newMachoLoad(ctxt.Arch, LC_DYSYMTAB, 18)

	n := 0

		rematerializeable: true,
		symEffect:         SymAddr,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 65791}, // AX CX DX BX SP BP SI DI SB
			},
			outputs: []outputInfo{
				{0, 239}, // AX CX DX BX BP SI DI
			},
		},
	},
	{
		name:        "LEAL1",
		auxType:     auxSymOff,
		argLen:      2,
		commutative: true,
		symEffect:   SymAddr,
		reg: regInfo{
			inputs: []inputInfo{

	// This also prevents a variable from "coming back from the dead" and presenting
	// stale pointers to the garbage collector. See issue 28445.
	if e&(ssa.SymRead|ssa.SymAddr) != 0 {
		effect |= uevar
	}
	if e&ssa.SymWrite != 0 {
		if !isfat(n.Type()) || v.Op == ssa.OpVarDef {
			effect |= varkill
		} else if lv.conservativeWrites {
			effect |= uevar
		}
	}

	ldr.SetAttrLocal(s, true)
	ctxt.xdefine("runtime.egcdata", sym.SRODATA, ldr.SymAddr(s)+ldr.SymSize(s))
	ldr.SetSymSect(ldr.LookupOrCreateSym("runtime.egcdata", 0), ldr.SymSect(s))

	s = ldr.LookupOrCreateSym("runtime.gcbss", 0)
	ldr.SetAttrLocal(s, true)
	ctxt.xdefine("runtime.egcbss", sym.SRODATA, ldr.SymAddr(s)+ldr.SymSize(s))
	ldr.SetSymSect(ldr.LookupOrCreateSym("runtime.egcbss", 0), ldr.SymSect(s))

			continue
		}
		if v.Type.IsTuple() && v.Type.FieldType(1).IsMemory() {
			// We could handle this situation however it is likely
			// to be very rare.
			return false
		}
		if v.Op.SymEffect()&SymAddr != 0 {
			// This case prevents an operation that calculates the
			// address of a local variable from being forced to schedule
			// before its corresponding VarDef.
			// See issue 28445.
			//   v1 = LOAD ...