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1 # Copyright 2013 The Chromium Authors. All rights reserved. | 1 # Copyright 2013 The Chromium Authors. All rights reserved. |
2 # Use of this source code is governed by a BSD-style license that can be | 2 # Use of this source code is governed by a BSD-style license that can be |
3 # found in the LICENSE file. | 3 # found in the LICENSE file. |
4 | 4 |
5 import mojom | 5 import mojom |
6 | 6 |
7 # mojom_pack provides a mechanism for determining the packed order and offsets | 7 # mojom_pack provides a mechanism for determining the packed order and offsets |
8 # of a mojom.Struct. | 8 # of a mojom.Struct. |
9 # | 9 # |
10 # ps = mojom_pack.PackedStruct(struct) | 10 # ps = mojom_pack.PackedStruct(struct) |
11 # ps.packed_fields will access a list of PackedField objects, each of which | 11 # ps.packed_fields will access a list of PackedField objects, each of which |
12 # will have an offset, a size and a bit (for mojom.BOOLs). | 12 # will have an offset, a size and a bit (for mojom.BOOLs). |
13 | 13 |
14 class PackedField(object): | 14 class PackedField(object): |
15 kind_to_size = { | 15 kind_to_size = { |
16 mojom.BOOL: 1, | 16 mojom.BOOL: 1, |
17 mojom.INT8: 1, | 17 mojom.INT8: 1, |
18 mojom.UINT8: 1, | 18 mojom.UINT8: 1, |
19 mojom.INT16: 2, | 19 mojom.INT16: 2, |
20 mojom.UINT16: 2, | 20 mojom.UINT16: 2, |
21 mojom.INT32: 4, | 21 mojom.INT32: 4, |
22 mojom.UINT32: 4, | 22 mojom.UINT32: 4, |
23 mojom.FLOAT: 4, | 23 mojom.FLOAT: 4, |
24 mojom.HANDLE: 4, | 24 mojom.HANDLE: 4, |
25 mojom.MSGPIPE: 4, | 25 mojom.MSGPIPE: 4, |
26 mojom.DCPIPE: 4, | 26 mojom.SHAREDBUFFER: 4, |
27 mojom.DPPIPE: 4, | 27 mojom.DCPIPE: 4, |
28 mojom.INT64: 8, | 28 mojom.DPPIPE: 4, |
29 mojom.UINT64: 8, | 29 mojom.INT64: 8, |
30 mojom.DOUBLE: 8, | 30 mojom.UINT64: 8, |
31 mojom.STRING: 8 | 31 mojom.DOUBLE: 8, |
| 32 mojom.STRING: 8 |
32 } | 33 } |
33 | 34 |
34 @classmethod | 35 @classmethod |
35 def GetSizeForKind(cls, kind): | 36 def GetSizeForKind(cls, kind): |
36 if isinstance(kind, mojom.Array) or isinstance(kind, mojom.Struct): | 37 if isinstance(kind, mojom.Array) or isinstance(kind, mojom.Struct): |
37 return 8 | 38 return 8 |
38 if isinstance(kind, mojom.Interface): | 39 if isinstance(kind, mojom.Interface): |
39 kind = mojom.MSGPIPE | 40 kind = mojom.MSGPIPE |
40 if isinstance(kind, mojom.Enum): | 41 if isinstance(kind, mojom.Enum): |
41 # TODO(mpcomplete): what about big enums? | 42 # TODO(mpcomplete): what about big enums? |
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139 limit_of_previous_field = packed_field.offset + packed_field.size | 140 limit_of_previous_field = packed_field.offset + packed_field.size |
140 | 141 |
141 for i in xrange(limit_of_previous_field, len(bytes)): | 142 for i in xrange(limit_of_previous_field, len(bytes)): |
142 bytes[i].is_padding = True | 143 bytes[i].is_padding = True |
143 | 144 |
144 for byte in bytes: | 145 for byte in bytes: |
145 # A given byte cannot both be padding and have a fields packed into it. | 146 # A given byte cannot both be padding and have a fields packed into it. |
146 assert not (byte.is_padding and byte.packed_fields) | 147 assert not (byte.is_padding and byte.packed_fields) |
147 | 148 |
148 return bytes | 149 return bytes |
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