ppapi/shared_impl/ppb_trace_event_impl.cc

   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/basictypes.h"
   8 #include "base/threading/platform_thread.h"
   9 #include "base/trace_event/trace_event.h"
  10 #include "ppapi/thunk/thunk.h"
  11
  12 namespace ppapi {
  13
  14 // PPB_Trace_Event_Dev is a shared implementation because Trace Events can be
  15 // sent from either the plugin process or renderer process depending on whether
  16 // the plugin is in- or out-of-process.  Also, for NaCl plugins these functions
  17 // will be executed from untrusted code and handled appropriately by tracing
  18 // functionality in the IRT.
  19
  20 // static
  21 void* TraceEventImpl::GetCategoryEnabled(const char* category_name) {
  22   // This casting is here because all mem_t return types in Pepper are void* and
  23   // non-const.  All mem_t parameters are const void* so there is no way to
  24   // return a pointer type to the caller without some const_cast.  The pointer
  25   // type the tracing system works with is normally unsigned char*.
  26   return const_cast<void*>(static_cast<const void*>(
  27       base::trace_event::TraceLog::GetInstance()->GetCategoryGroupEnabled(
  28           category_name)));
  29 }
  30
  31 // static
  32 void TraceEventImpl::AddTraceEvent(int8_t phase,
  33                                    const void* category_enabled,
  34                                    const char* name,
  35                                    uint64_t id,
  36                                    uint32_t num_args,
  37                                    const char* arg_names[],
  38                                    const uint8_t arg_types[],
  39                                    const uint64_t arg_values[],
  40                                    uint8_t flags) {
  41
  42   static_assert(sizeof(unsigned long long) == sizeof(uint64_t),
  43                 "unexpected data type sizes");
  44
  45   base::trace_event::TraceLog::GetInstance()->AddTraceEvent(
  46       phase,
  47       static_cast<const unsigned char*>(category_enabled),
  48       name,
  49       id,
  50       num_args,
  51       arg_names,
  52       arg_types,
  53       // This cast is necessary for LP64 systems, where uint64_t is defined as
  54       // an unsigned long int, but trace_event internals are hermetic and
  55       // accepts an |unsigned long long*|.  The pointer types are compatible but
  56       // the compiler throws an error without an explicit cast.
  57       reinterpret_cast<const unsigned long long*>(arg_values),
  58       NULL,
  59       flags);
  60 }
  61
  62 // static
  63 void TraceEventImpl::AddTraceEventWithThreadIdAndTimestamp(
  64     int8_t phase,
  65     const void* category_enabled,
  66     const char* name,
  67     uint64_t id,
  68     int32_t thread_id,
  69     int64_t timestamp,
  70     uint32_t num_args,
  71     const char* arg_names[],
  72     const uint8_t arg_types[],
  73     const uint64_t arg_values[],
  74     uint8_t flags) {
  75   base::trace_event::TraceLog::GetInstance()
  76       ->AddTraceEventWithThreadIdAndTimestamp(
  77           phase,
  78           static_cast<const unsigned char*>(category_enabled),
  79           name,
  80           id,
  81           thread_id,
  82           base::TraceTicks::FromInternalValue(timestamp),
  83           num_args,
  84           arg_names,
  85           arg_types,
  86       // This cast is necessary for LP64 systems, where uint64_t is defined as
  87       // an unsigned long int, but trace_event internals are hermetic and
  88       // accepts an |unsigned long long*|.  The pointer types are compatible but
  89       // the compiler throws an error without an explicit cast.
  90       reinterpret_cast<const unsigned long long*>(arg_values),
  91       NULL,
  92       flags);
  93 }
  94
  95 // static
  96 int64_t TraceEventImpl::Now() {
  97   return base::TraceTicks::Now().ToInternalValue();
  98 }
  99
 100 // static
 101 void TraceEventImpl::SetThreadName(const char* thread_name) {
 102   base::PlatformThread::SetName(thread_name);
 103 }
 104
 105 namespace {
 106
 107 const PPB_Trace_Event_Dev_0_1 g_ppb_trace_event_thunk_0_1 = {
 108     &TraceEventImpl::GetCategoryEnabled, &TraceEventImpl::AddTraceEvent,
 109     &TraceEventImpl::SetThreadName, };
 110
 111 const PPB_Trace_Event_Dev_0_2 g_ppb_trace_event_thunk_0_2 = {
 112     &TraceEventImpl::GetCategoryEnabled,
 113     &TraceEventImpl::AddTraceEvent,
 114     &TraceEventImpl::AddTraceEventWithThreadIdAndTimestamp,
 115     &TraceEventImpl::Now,
 116     &TraceEventImpl::SetThreadName, };
 117
 118 }  // namespace ppapi
 119
 120 }  // namespace
 121
 122 namespace ppapi {
 123 namespace thunk {
 124
 125 const PPB_Trace_Event_Dev_0_1* GetPPB_Trace_Event_Dev_0_1_Thunk() {
 126   return &g_ppb_trace_event_thunk_0_1;
 127 }
 128
 129 const PPB_Trace_Event_Dev_0_2* GetPPB_Trace_Event_Dev_0_2_Thunk() {
 130   return &g_ppb_trace_event_thunk_0_2;
 131 }
 132
 133 }  // namespace thunk
 134 }  // namespace ppapi