Golang dwarf.Type類代碼示例

func newVariable(name string, addr uintptr, dwarfType dwarf.Type, thread *Thread) (*Variable, error) {
	v := &Variable{
		Name:      name,
		Addr:      addr,
		dwarfType: dwarfType,
		thread:    thread,
		Type:      dwarfType.String(),
	}

	switch t := dwarfType.(type) {
	case *dwarf.StructType:
		if strings.HasPrefix(t.StructName, "[]") {
			err := v.loadSliceInfo(t)
			if err != nil {
				return nil, err
			}
		}
	case *dwarf.ArrayType:
		v.base = v.Addr
		v.Len = t.Count
		v.Cap = -1
		v.fieldType = t.Type
		v.stride = 0

		if t.Count > 0 {
			v.stride = t.ByteSize / t.Count
		}
	}

	return v, nil
}

func (thread *Thread) readSlice(addr uintptr, t *dwarf.StructType) (string, error) {
	var sliceLen, sliceCap int64
	var arrayAddr uintptr
	var arrayType dwarf.Type
	for _, f := range t.Field {
		switch f.Name {
		case "array":
			val, err := thread.readMemory(addr+uintptr(f.ByteOffset), thread.dbp.arch.PtrSize())
			if err != nil {
				return "", err
			}
			arrayAddr = uintptr(binary.LittleEndian.Uint64(val))
			// Dereference array type to get value type
			ptrType, ok := f.Type.(*dwarf.PtrType)
			if !ok {
				return "", fmt.Errorf("Invalid type %s in slice array", f.Type)
			}
			arrayType = ptrType.Type
		case "len":
			lstr, err := thread.extractValue(nil, int64(addr+uintptr(f.ByteOffset)), f.Type, true)
			if err != nil {
				return "", err
			}
			sliceLen, err = strconv.ParseInt(lstr, 10, 64)
			if err != nil {
				return "", err
			}
		case "cap":
			cstr, err := thread.extractValue(nil, int64(addr+uintptr(f.ByteOffset)), f.Type, true)
			if err != nil {
				return "", err
			}
			sliceCap, err = strconv.ParseInt(cstr, 10, 64)
			if err != nil {
				return "", err
			}
		}
	}

	stride := arrayType.Size()
	if _, ok := arrayType.(*dwarf.PtrType); ok {
		stride = int64(thread.dbp.arch.PtrSize())
	}
	vals, err := thread.readArrayValues(arrayAddr, sliceLen, stride, arrayType)
	if err != nil {
		return "", err
	}

	return fmt.Sprintf("[]%s len: %d, cap: %d, [%s]", arrayType, sliceLen, sliceCap, strings.Join(vals, ",")), nil
}

// Type returns a *Type with the same memory layout as
// dtype when used as the type of a variable or a struct field.
func (c *typeConv) Type(dtype dwarf.Type, pos token.Pos) *Type {
	if t, ok := c.m[dtype]; ok {
		if t.Go == nil {
			fatalf("%s: type conversion loop at %s", lineno(pos), dtype)
		}
		return t
	}

	t := new(Type)
	t.Size = dtype.Size() // note: wrong for array of pointers, corrected below
	t.Align = -1
	t.C = &TypeRepr{Repr: dtype.Common().Name}
	c.m[dtype] = t

	switch dt := dtype.(type) {
	default:
		fatalf("%s: unexpected type: %s", lineno(pos), dtype)

	case *dwarf.AddrType:
		if t.Size != c.ptrSize {
			fatalf("%s: unexpected: %d-byte address type - %s", lineno(pos), t.Size, dtype)
		}
		t.Go = c.uintptr
		t.Align = t.Size

	case *dwarf.ArrayType:
		if dt.StrideBitSize > 0 {
			// Cannot represent bit-sized elements in Go.
			t.Go = c.Opaque(t.Size)
			break
		}
		count := dt.Count
		if count == -1 {
			// Indicates flexible array member, which Go doesn't support.
			// Translate to zero-length array instead.
			count = 0
		}
		sub := c.Type(dt.Type, pos)
		t.Align = sub.Align
		t.Go = &ast.ArrayType{
			Len: c.intExpr(count),
			Elt: sub.Go,
		}
		// Recalculate t.Size now that we know sub.Size.
		t.Size = count * sub.Size
		t.C.Set("__typeof__(%s[%d])", sub.C, dt.Count)

	case *dwarf.BoolType:
		t.Go = c.bool
		t.Align = 1

	case *dwarf.CharType:
		if t.Size != 1 {
			fatalf("%s: unexpected: %d-byte char type - %s", lineno(pos), t.Size, dtype)
		}
		t.Go = c.int8
		t.Align = 1

	case *dwarf.EnumType:
		if t.Align = t.Size; t.Align >= c.ptrSize {
			t.Align = c.ptrSize
		}
		t.C.Set("enum " + dt.EnumName)
		signed := 0
		t.EnumValues = make(map[string]int64)
		for _, ev := range dt.Val {
			t.EnumValues[ev.Name] = ev.Val
			if ev.Val < 0 {
				signed = signedDelta
			}
		}
		switch t.Size + int64(signed) {
		default:
			fatalf("%s: unexpected: %d-byte enum type - %s", lineno(pos), t.Size, dtype)
		case 1:
			t.Go = c.uint8
		case 2:
			t.Go = c.uint16
		case 4:
			t.Go = c.uint32
		case 8:
			t.Go = c.uint64
		case 1 + signedDelta:
			t.Go = c.int8
		case 2 + signedDelta:
			t.Go = c.int16
		case 4 + signedDelta:
			t.Go = c.int32
		case 8 + signedDelta:
			t.Go = c.int64
		}

	case *dwarf.FloatType:
		switch t.Size {
		default:
			fatalf("%s: unexpected: %d-byte float type - %s", lineno(pos), t.Size, dtype)
		case 4:
			t.Go = c.float32
//.........這裏部分代碼省略.........

// Type returns a *Type with the same memory layout as
// dtype when used as the type of a variable or a struct field.
func (c *typeConv) Type(dtype dwarf.Type, pos token.Pos) *Type {
	if t, ok := c.m[dtype]; ok {
		if t.Go == nil {
			fatalf("%s: type conversion loop at %s", lineno(pos), dtype)
		}
		return t
	}

	// clang won't generate DW_AT_byte_size for pointer types,
	// so we have to fix it here.
	if dt, ok := base(dtype).(*dwarf.PtrType); ok && dt.ByteSize == -1 {
		dt.ByteSize = c.ptrSize
	}

	t := new(Type)
	t.Size = dtype.Size() // note: wrong for array of pointers, corrected below
	t.Align = -1
	t.C = &TypeRepr{Repr: dtype.Common().Name}
	c.m[dtype] = t

	switch dt := dtype.(type) {
	default:
		fatalf("%s: unexpected type: %s", lineno(pos), dtype)

	case *dwarf.AddrType:
		if t.Size != c.ptrSize {
			fatalf("%s: unexpected: %d-byte address type - %s", lineno(pos), t.Size, dtype)
		}
		t.Go = c.uintptr
		t.Align = t.Size

	case *dwarf.ArrayType:
		if dt.StrideBitSize > 0 {
			// Cannot represent bit-sized elements in Go.
			t.Go = c.Opaque(t.Size)
			break
		}
		gt := &ast.ArrayType{
			Len: c.intExpr(dt.Count),
		}
		t.Go = gt // publish before recursive call
		sub := c.Type(dt.Type, pos)
		t.Align = sub.Align
		gt.Elt = sub.Go
		t.C.Set("__typeof__(%s[%d])", sub.C, dt.Count)

	case *dwarf.BoolType:
		t.Go = c.bool
		t.Align = 1

	case *dwarf.CharType:
		if t.Size != 1 {
			fatalf("%s: unexpected: %d-byte char type - %s", lineno(pos), t.Size, dtype)
		}
		t.Go = c.int8
		t.Align = 1

	case *dwarf.EnumType:
		if t.Align = t.Size; t.Align >= c.ptrSize {
			t.Align = c.ptrSize
		}
		t.C.Set("enum " + dt.EnumName)
		signed := 0
		t.EnumValues = make(map[string]int64)
		for _, ev := range dt.Val {
			t.EnumValues[ev.Name] = ev.Val
			if ev.Val < 0 {
				signed = signedDelta
			}
		}
		switch t.Size + int64(signed) {
		default:
			fatalf("%s: unexpected: %d-byte enum type - %s", lineno(pos), t.Size, dtype)
		case 1:
			t.Go = c.uint8
		case 2:
			t.Go = c.uint16
		case 4:
			t.Go = c.uint32
		case 8:
			t.Go = c.uint64
		case 1 + signedDelta:
			t.Go = c.int8
		case 2 + signedDelta:
			t.Go = c.int16
		case 4 + signedDelta:
			t.Go = c.int32
		case 8 + signedDelta:
			t.Go = c.int64
		}

	case *dwarf.FloatType:
		switch t.Size {
		default:
			fatalf("%s: unexpected: %d-byte float type - %s", lineno(pos), t.Size, dtype)
		case 4:
			t.Go = c.float32
		case 8:
//.........這裏部分代碼省略.........

// Type returns a *Type with the same memory layout as
// dtype when used as the type of a variable or a struct field.
func (c *typeConv) Type(dtype dwarf.Type) *Type {
	if t, ok := c.m[dtype]; ok {
		if t.Go == nil {
			fatalf("type conversion loop at %s", dtype)
		}
		return t
	}

	t := new(Type)
	t.Size = dtype.Size()
	t.Align = -1
	t.C = &TypeRepr{Repr: dtype.Common().Name}
	c.m[dtype] = t

	if t.Size < 0 {
		// Unsized types are [0]byte
		t.Size = 0
		t.Go = c.Opaque(0)
		if t.C.Empty() {
			t.C.Set("void")
		}
		return t
	}

	switch dt := dtype.(type) {
	default:
		fatalf("unexpected type: %s", dtype)

	case *dwarf.AddrType:
		if t.Size != c.ptrSize {
			fatalf("unexpected: %d-byte address type - %s", t.Size, dtype)
		}
		t.Go = c.uintptr
		t.Align = t.Size

	case *dwarf.ArrayType:
		if dt.StrideBitSize > 0 {
			// Cannot represent bit-sized elements in Go.
			t.Go = c.Opaque(t.Size)
			break
		}
		gt := &ast.ArrayType{
			Len: c.intExpr(dt.Count),
		}
		t.Go = gt // publish before recursive call
		sub := c.Type(dt.Type)
		t.Align = sub.Align
		gt.Elt = sub.Go
		t.C.Set("typeof(%s[%d])", sub.C, dt.Count)

	case *dwarf.BoolType:
		t.Go = c.bool
		t.Align = c.ptrSize

	case *dwarf.CharType:
		if t.Size != 1 {
			fatalf("unexpected: %d-byte char type - %s", t.Size, dtype)
		}
		t.Go = c.int8
		t.Align = 1

	case *dwarf.EnumType:
		if t.Align = t.Size; t.Align >= c.ptrSize {
			t.Align = c.ptrSize
		}
		t.C.Set("enum " + dt.EnumName)
		signed := 0
		t.EnumValues = make(map[string]int64)
		for _, ev := range dt.Val {
			t.EnumValues[ev.Name] = ev.Val
			if ev.Val < 0 {
				signed = signedDelta
			}
		}
		switch t.Size + int64(signed) {
		default:
			fatalf("unexpected: %d-byte enum type - %s", t.Size, dtype)
		case 1:
			t.Go = c.uint8
		case 2:
			t.Go = c.uint16
		case 4:
			t.Go = c.uint32
		case 8:
			t.Go = c.uint64
		case 1 + signedDelta:
			t.Go = c.int8
		case 2 + signedDelta:
			t.Go = c.int16
		case 4 + signedDelta:
			t.Go = c.int32
		case 8 + signedDelta:
			t.Go = c.int64
		}

	case *dwarf.FloatType:
		switch t.Size {
		default:
//.........這裏部分代碼省略.........

// Type returns a *Type with the same memory layout as
// dtype when used as the type of a variable or a struct field.
func (c *typeConv) Type(dtype dwarf.Type) *Type {
	if t, ok := c.m[dtype]; ok {
		if t.Go == nil {
			fatal("type conversion loop at %s", dtype)
		}
		return t
	}

	t := new(Type)
	t.Size = dtype.Size()
	t.Align = -1
	t.C = dtype.Common().Name
	if t.Size < 0 {
		fatal("dwarf.Type %s reports unknown size", dtype)
	}

	c.m[dtype] = t
	switch dt := dtype.(type) {
	default:
		fatal("unexpected type: %s", dtype)

	case *dwarf.AddrType:
		if t.Size != c.ptrSize {
			fatal("unexpected: %d-byte address type - %s", t.Size, dtype)
		}
		t.Go = c.uintptr
		t.Align = t.Size

	case *dwarf.ArrayType:
		if dt.StrideBitSize > 0 {
			// Cannot represent bit-sized elements in Go.
			t.Go = c.Opaque(t.Size)
			break
		}
		gt := &ast.ArrayType{
			Len: c.intExpr(dt.Count),
		}
		t.Go = gt // publish before recursive call
		sub := c.Type(dt.Type)
		t.Align = sub.Align
		gt.Elt = sub.Go
		t.C = fmt.Sprintf("typeof(%s[%d])", sub.C, dt.Count)

	case *dwarf.CharType:
		if t.Size != 1 {
			fatal("unexpected: %d-byte char type - %s", t.Size, dtype)
		}
		t.Go = c.int8
		t.Align = 1

	case *dwarf.EnumType:
		switch t.Size {
		default:
			fatal("unexpected: %d-byte enum type - %s", t.Size, dtype)
		case 1:
			t.Go = c.uint8
		case 2:
			t.Go = c.uint16
		case 4:
			t.Go = c.uint32
		case 8:
			t.Go = c.uint64
		}
		if t.Align = t.Size; t.Align >= c.ptrSize {
			t.Align = c.ptrSize
		}
		t.C = "enum " + dt.EnumName

	case *dwarf.FloatType:
		switch t.Size {
		default:
			fatal("unexpected: %d-byte float type - %s", t.Size, dtype)
		case 4:
			t.Go = c.float32
		case 8:
			t.Go = c.float64
		}
		if t.Align = t.Size; t.Align >= c.ptrSize {
			t.Align = c.ptrSize
		}

	case *dwarf.FuncType:
		// No attempt at translation: would enable calls
		// directly between worlds, but we need to moderate those.
		t.Go = c.uintptr
		t.Align = c.ptrSize

	case *dwarf.IntType:
		if dt.BitSize > 0 {
			fatal("unexpected: %d-bit int type - %s", dt.BitSize, dtype)
		}
		switch t.Size {
		default:
			fatal("unexpected: %d-byte int type - %s", t.Size, dtype)
		case 1:
			t.Go = c.int8
		case 2:
			t.Go = c.int16
//.........這裏部分代碼省略.........

func (v *Variable) isType(typ dwarf.Type, kind reflect.Kind) error {
	if v.DwarfType != nil {
		if typ != nil && typ.String() != v.RealType.String() {
			return fmt.Errorf("can not convert value of type %s to %s", v.DwarfType.String(), typ.String())
		}
		return nil
	}

	if typ == nil {
		return nil
	}

	if v == nilVariable {
		switch kind {
		case reflect.Slice, reflect.Map, reflect.Func, reflect.Ptr, reflect.Chan, reflect.Interface:
			return nil
		default:
			return fmt.Errorf("mismatched types nil and %s", typ.String())
		}
	}

	converr := fmt.Errorf("can not convert %s constant to %s", v.Value, typ.String())

	if v.Value == nil {
		return converr
	}

	switch t := typ.(type) {
	case *dwarf.IntType:
		if v.Value.Kind() != constant.Int {
			return converr
		}
	case *dwarf.UintType:
		if v.Value.Kind() != constant.Int {
			return converr
		}
	case *dwarf.FloatType:
		if (v.Value.Kind() != constant.Int) && (v.Value.Kind() != constant.Float) {
			return converr
		}
	case *dwarf.BoolType:
		if v.Value.Kind() != constant.Bool {
			return converr
		}
	case *dwarf.StructType:
		if t.StructName != "string" {
			return converr
		}
		if v.Value.Kind() != constant.String {
			return converr
		}
	case *dwarf.ComplexType:
		if v.Value.Kind() != constant.Complex && v.Value.Kind() != constant.Float && v.Value.Kind() != constant.Int {
			return converr
		}
	default:
		return converr
	}

	return nil
}

// Eval type cast expressions
func (scope *EvalScope) evalTypeCast(node *ast.CallExpr) (*Variable, error) {
	if len(node.Args) != 1 {
		return nil, fmt.Errorf("wrong number of arguments for a type cast")
	}

	argv, err := scope.evalAST(node.Args[0])
	if err != nil {
		return nil, err
	}
	argv.loadValue()
	if argv.Unreadable != nil {
		return nil, argv.Unreadable
	}

	fnnode := node.Fun

	// remove all enclosing parenthesis from the type name
	for {
		p, ok := fnnode.(*ast.ParenExpr)
		if !ok {
			break
		}
		fnnode = p.X
	}

	var typ dwarf.Type

	if snode, ok := fnnode.(*ast.StarExpr); ok {
		// Pointer types only appear in the dwarf informations when
		// a pointer to the type is used in the target program, here
		// we create a pointer type on the fly so that the user can
		// specify a pointer to any variable used in the target program
		ptyp, err := scope.findType(exprToString(snode.X))
		if err != nil {
			return nil, err
		}
		typ = &dwarf.PtrType{dwarf.CommonType{int64(scope.Thread.dbp.arch.PtrSize()), exprToString(fnnode)}, ptyp}
	} else {
		typ, err = scope.findType(exprToString(fnnode))
		if err != nil {
			return nil, err
		}
	}

	// only supports cast of integer constants into pointers
	ptyp, isptrtyp := typ.(*dwarf.PtrType)
	if !isptrtyp {
		return nil, fmt.Errorf("can not convert \"%s\" to %s", exprToString(node.Args[0]), typ.String())
	}

	switch argv.Kind {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		// ok
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		// ok
	default:
		return nil, fmt.Errorf("can not convert \"%s\" to %s", exprToString(node.Args[0]), typ.String())
	}

	n, _ := constant.Int64Val(argv.Value)

	v := newVariable("", 0, ptyp, scope.Thread)
	v.Children = []Variable{*newVariable("", uintptr(n), ptyp.Type, scope.Thread)}
	return v, nil
}