// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Indexed package export.
//
// The indexed export data format is an evolution of the previous
// binary export data format. Its chief contribution is introducing an
// index table, which allows efficient random access of individual
// declarations and inline function bodies. In turn, this allows

func walkAssignMapRead(init *ir.Nodes, n *ir.AssignListStmt) ir.Node {
	init.Append(ir.TakeInit(n)...)

	r := n.Rhs[0].(*ir.IndexExpr)
	walkExprListSafe(n.Lhs, init)
	r.X = walkExpr(r.X, init)
	r.Index = walkExpr(r.Index, init)
	t := r.X.Type()

	fast := mapfast(t)
	key := mapKeyArg(fast, r, r.Index, false)

	// from:
	//   a,b = m[i]
	// to:
	//   var,b = mapaccess2*(t, m, i)
	//   a = *var
	a := n.Lhs[0]

	if !ok {
		return "", "", s, ErrHeader
	}

	// Parse the first token as a decimal integer.
	n, perr := strconv.ParseInt(nStr, 10, 0) // Intentionally parse as native int
	if perr != nil || n < 5 || n > int64(len(s)) {
		return "", "", s, ErrHeader
	}
	n -= int64(len(nStr) + 1) // convert from index in s to index in rest
	if n <= 0 {
		return "", "", s, ErrHeader
	}

		case *KeyValueExpr:
			m = n.Value
		case *FuncLit:
			m = n.Body
		case *ParenExpr:
			m = n.X
		case *SelectorExpr:
			m = n.Sel
		case *IndexExpr:
			m = n.Index
		case *SliceExpr:
			for i := len(n.Index) - 1; i >= 0; i-- {
				if x := n.Index[i]; x != nil {
					m = x
					continue
				}
			}
			m = n.X
		case *AssertExpr:
			m = n.Type
		case *TypeSwitchGuard:
			m = n.X

		}

		if argErr.Index != test.wantAt {
			t.Errorf("Instantiate(%v, %v): error at index %d, want index %d", T, test.targs, argErr.Index, test.wantAt)
		}
	}
}

func TestArgumentErrorUnwrapping(t *testing.T) {
	var err error = &ArgumentError{
		Index: 1,
		Err:   Error{Msg: "test"},
	}
	var e Error
	if !errors.As(err, &e) {

			// These appear to be fine, but they fail the
			// integer constraint below, so okay them here.
			// Sample non-integer conversion: map[string]string -> *uint8
			return v
		}

		if etypesign(from.Kind()) == 0 {
			s.Fatalf("CONVNOP unrecognized non-integer %v -> %v\n", from, to)
			return nil
		}

		// integer, same width, same sign
		return v

	case ir.OCONV:

		{name: "I64Load8S", asm: "I64Load8S", argLength: 2, reg: gpload, aux: "Int64", typ: "Int8"},     // read signed 8-bit integer from address arg0+aux, arg1=mem
		{name: "I64Load16U", asm: "I64Load16U", argLength: 2, reg: gpload, aux: "Int64", typ: "UInt16"}, // read unsigned 16-bit integer from address arg0+aux, arg1=mem

		}
		num = int16(amount)
	} else if p.peek() == '[' {
		// parses an element: [Index]
		p.get('[')
		tok := p.get(scanner.Int)
		index, err := strconv.ParseInt(tok.String(), 10, 16)
		p.get(']')
		if err != nil {
			p.errorf("parsing element index: %s", err)
		}
		isIndex = true
		isAmount = false
		num = int16(index)
	}

	switch p.arch.Family {
	case sys.ARM64:

	// AVX512GATHER index/index #UD cases.
	VPGATHERQQ (BP)(X2*2), K1, X2   // ERROR "index and destination registers should be distinct"
	VPGATHERQQ (BP)(Y15*2), K1, Y15 // ERROR "index and destination registers should be distinct"
	VPGATHERQQ (BP)(Z20*2), K1, Z20 // ERROR "index and destination registers should be distinct"
	VPGATHERDQ (BP)(X2*2), K1, X2   // ERROR "index and destination registers should be distinct"

		if l != nil {
			l.clear()
		}
	}
	m.lastIndex = -1
	m.lastMap = nil
}

// mapFor returns the line range map for a given file index.
func (m *xposmap) mapFor(index int32) *biasedSparseMap {
	if index == m.lastIndex {
		return m.lastMap
	}
	mf := m.maps[index]
	m.lastIndex = index
	m.lastMap = mf
	return mf
}

// set inserts p->v into the map.