1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ipc/ipc_message.h"
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include "base/atomic_sequence_num.h"
#include "base/logging.h"
#include "build/build_config.h"
#include "ipc/ipc_message_attachment.h"
#include "ipc/ipc_message_attachment_set.h"
#if defined(OS_POSIX)
#include "base/file_descriptor_posix.h"
#include "ipc/ipc_platform_file_attachment_posix.h"
#endif
namespace {
base::StaticAtomicSequenceNumber g_ref_num;
// Create a reference number for identifying IPC messages in traces. The return
// values has the reference number stored in the upper 24 bits, leaving the low
// 8 bits set to 0 for use as flags.
inline uint32_t GetRefNumUpper24() {
base::trace_event::TraceLog* trace_log =
base::trace_event::TraceLog::GetInstance();
uint32_t pid = trace_log ? trace_log->process_id() : 0;
uint32_t count = g_ref_num.GetNext();
// The 24 bit hash is composed of 14 bits of the count and 10 bits of the
// Process ID. With the current trace event buffer cap, the 14-bit count did
// not appear to wrap during a trace. Note that it is not a big deal if
// collisions occur, as this is only used for debugging and trace analysis.
return ((pid << 14) | (count & 0x3fff)) << 8;
}
} // namespace
namespace IPC {
//------------------------------------------------------------------------------
Message::~Message() {
}
Message::Message() : base::Pickle(sizeof(Header)) {
header()->routing = header()->type = 0;
header()->flags = GetRefNumUpper24();
#if defined(OS_POSIX)
header()->num_fds = 0;
header()->pad = 0;
#endif
Init();
}
Message::Message(int32_t routing_id, uint32_t type, PriorityValue priority)
: base::Pickle(sizeof(Header)) {
header()->routing = routing_id;
header()->type = type;
DCHECK((priority & 0xffffff00) == 0);
header()->flags = priority | GetRefNumUpper24();
#if defined(OS_POSIX)
header()->num_fds = 0;
header()->pad = 0;
#endif
Init();
}
Message::Message(const char* data, int data_len)
: base::Pickle(data, data_len) {
Init();
}
Message::Message(const Message& other) : base::Pickle(other) {
Init();
attachment_set_ = other.attachment_set_;
}
void Message::Init() {
dispatch_error_ = false;
#ifdef IPC_MESSAGE_LOG_ENABLED
received_time_ = 0;
dont_log_ = false;
log_data_ = NULL;
#endif
}
Message& Message::operator=(const Message& other) {
*static_cast<base::Pickle*>(this) = other;
attachment_set_ = other.attachment_set_;
return *this;
}
void Message::SetHeaderValues(int32_t routing, uint32_t type, uint32_t flags) {
// This should only be called when the message is already empty.
DCHECK(payload_size() == 0);
header()->routing = routing;
header()->type = type;
header()->flags = flags;
}
void Message::EnsureMessageAttachmentSet() {
if (attachment_set_.get() == NULL)
attachment_set_ = new MessageAttachmentSet;
}
#ifdef IPC_MESSAGE_LOG_ENABLED
void Message::set_sent_time(int64_t time) {
DCHECK((header()->flags & HAS_SENT_TIME_BIT) == 0);
header()->flags |= HAS_SENT_TIME_BIT;
WriteInt64(time);
}
int64_t Message::sent_time() const {
if ((header()->flags & HAS_SENT_TIME_BIT) == 0)
return 0;
const char* data = end_of_payload();
data -= sizeof(int64_t);
return *(reinterpret_cast<const int64_t*>(data));
}
void Message::set_received_time(int64_t time) const {
received_time_ = time;
}
#endif
Message::NextMessageInfo::NextMessageInfo()
: message_size(0), message_found(false), pickle_end(nullptr),
message_end(nullptr) {}
Message::NextMessageInfo::~NextMessageInfo() {}
// static
void Message::FindNext(const char* range_start,
const char* range_end,
NextMessageInfo* info) {
DCHECK(info);
info->message_found = false;
info->message_size = 0;
size_t pickle_size = 0;
if (!base::Pickle::PeekNext(sizeof(Header),
range_start, range_end, &pickle_size))
return;
bool have_entire_pickle =
static_cast<size_t>(range_end - range_start) >= pickle_size;
info->message_size = pickle_size;
if (!have_entire_pickle)
return;
const char* pickle_end = range_start + pickle_size;
info->message_end = pickle_end;
info->pickle_end = pickle_end;
info->message_found = true;
}
bool Message::WriteAttachment(
scoped_refptr<base::Pickle::Attachment> attachment) {
size_t index;
bool success = attachment_set()->AddAttachment(
make_scoped_refptr(static_cast<MessageAttachment*>(attachment.get())),
&index);
DCHECK(success);
// NOTE: If you add more data to the pickle, make sure to update
// PickleSizer::AddAttachment.
// Write the index of the descriptor so that we don't have to
// keep the current descriptor as extra decoding state when deserialising.
WriteInt(static_cast<int>(index));
return success;
}
bool Message::ReadAttachment(
base::PickleIterator* iter,
scoped_refptr<base::Pickle::Attachment>* attachment) const {
int index;
if (!iter->ReadInt(&index))
return false;
MessageAttachmentSet* attachment_set = attachment_set_.get();
if (!attachment_set)
return false;
*attachment = attachment_set->GetAttachmentAt(index);
return nullptr != attachment->get();
}
bool Message::HasAttachments() const {
return attachment_set_.get() && !attachment_set_->empty();
}
} // namespace IPC
|
