ppb_trace_event_impl.cc revision c2e0dbddbe15c98d52c4786dac06cb8952a8ae6d 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ppapi/shared_impl/ppb_trace_event_impl.h"
6
7#include "base/debug/trace_event.h"
8#include "ppapi/thunk/thunk.h"
9
10
11namespace ppapi {
12
13// PPB_Trace_Event_Dev is a shared implementation because Trace Events can be
14// sent from either the plugin process or renderer process depending on whether
15// the plugin is in- or out-of-process.  Also, for NaCl plugins these functions
16// will be executed from untrusted code and handled appropriately by tracing
17// functionality in the IRT.
18
19// static
20void* TraceEventImpl::GetCategoryEnabled(const char* category_name) {
21  // This casting is here because all mem_t return types in Pepper are void* and
22  // non-const.  All mem_t parameters are const void* so there is no way to
23  // return a pointer type to the caller without some const_cast.  The pointer
24  // type the tracing system works with is normally unsigned char*.
25  return const_cast<void*>(static_cast<const void*>(
26      base::debug::TraceLog::GetInstance()->GetCategoryGroupEnabled(
27          category_name)));
28}
29
30// static
31void TraceEventImpl::AddTraceEvent(int8_t phase,
32                                      const void* category_enabled,
33                                      const char* name,
34                                      uint64_t id,
35                                      uint32_t num_args,
36                                      const char* arg_names[],
37                                      const uint8_t arg_types[],
38                                      const uint64_t arg_values[],
39                                      uint8_t flags) {
40  base::debug::TraceLog::GetInstance()->AddTraceEvent(phase,
41      static_cast<const unsigned char*>(category_enabled), name, id, num_args,
42      arg_names, arg_types,
43      // This cast is necessary for LP64 systems, where uint64_t is defined as
44      // an unsigned long int, but trace_event internals are hermetic and
45      // accepts an |unsigned long long*|.  The pointer types are compatible but
46      // the compiler throws an error without an explicit cast.
47      reinterpret_cast<const unsigned long long*>(arg_values), NULL, flags);
48}
49
50// static
51void TraceEventImpl::SetThreadName(const char* thread_name) {
52  base::PlatformThread::SetName(thread_name);
53}
54
55namespace {
56
57const PPB_Trace_Event_Dev g_ppb_trace_event_thunk = {
58  &TraceEventImpl::GetCategoryEnabled,
59  &TraceEventImpl::AddTraceEvent,
60  &TraceEventImpl::SetThreadName,
61};
62
63}  // namespace ppapi
64
65}  // namespace
66
67namespace ppapi {
68namespace thunk {
69
70const PPB_Trace_Event_Dev_0_1* GetPPB_Trace_Event_Dev_0_1_Thunk() {
71  return &g_ppb_trace_event_thunk;
72}
73
74}  // namespace thunk
75}  // namespace ppapi
76