GCC Code Coverage Report
Directory: ../ Exec Total Coverage
File: /home/iojs/build/workspace/node-test-commit-linux-coverage-daily/nodes/benchmark/out/../src/tracing/trace_event.h Lines: 64 75 85.3 %
Date: 2020-05-27 22:15:15 Branches: 57 118 48.3 %

Line Branch Exec Source
1
// Copyright 2015 the V8 project 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
#ifndef SRC_TRACING_TRACE_EVENT_H_
6
#define SRC_TRACING_TRACE_EVENT_H_
7
8
#include "node_platform.h"
9
#include "v8-platform.h"
10
#include "trace_event_common.h"
11
#include <atomic>
12
13
// This header file defines implementation details of how the trace macros in
14
// trace_event_common.h collect and store trace events. Anything not
15
// implementation-specific should go in trace_macros_common.h instead of here.
16
17
18
// The pointer returned from GetCategoryGroupEnabled() points to a
19
// value with zero or more of the following bits. Used in this class only.
20
// The TRACE_EVENT macros should only use the value as a bool.
21
// These values must be in sync with macro values in trace_log.h in
22
// chromium.
23
enum CategoryGroupEnabledFlags {
24
  // Category group enabled for the recording mode.
25
  kEnabledForRecording_CategoryGroupEnabledFlags = 1 << 0,
26
  // Category group enabled by SetEventCallbackEnabled().
27
  kEnabledForEventCallback_CategoryGroupEnabledFlags = 1 << 2,
28
  // Category group enabled to export events to ETW.
29
  kEnabledForETWExport_CategoryGroupEnabledFlags = 1 << 3,
30
};
31
32
// By default, const char* argument values are assumed to have long-lived scope
33
// and will not be copied. Use this macro to force a const char* to be copied.
34
#define TRACE_STR_COPY(str) node::tracing::TraceStringWithCopy(str)
35
36
// By default, uint64 ID argument values are not mangled with the Process ID in
37
// TRACE_EVENT_ASYNC macros. Use this macro to force Process ID mangling.
38
#define TRACE_ID_MANGLE(id) node::tracing::TraceID::ForceMangle(id)
39
40
// By default, pointers are mangled with the Process ID in TRACE_EVENT_ASYNC
41
// macros. Use this macro to prevent Process ID mangling.
42
#define TRACE_ID_DONT_MANGLE(id) node::tracing::TraceID::DontMangle(id)
43
44
// By default, trace IDs are eventually converted to a single 64-bit number. Use
45
// this macro to add a scope string.
46
#define TRACE_ID_WITH_SCOPE(scope, id) \
47
  trace_event_internal::TraceID::WithScope(scope, id)
48
49
#define INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE() \
50
  *INTERNAL_TRACE_EVENT_UID(category_group_enabled) &                    \
51
      (kEnabledForRecording_CategoryGroupEnabledFlags |                  \
52
       kEnabledForEventCallback_CategoryGroupEnabledFlags)
53
54
// The following macro has no implementation, but it needs to exist since
55
// it gets called from scoped trace events. It cannot call UNIMPLEMENTED()
56
// since an empty implementation is a valid one.
57
#define INTERNAL_TRACE_MEMORY(category, name)
58
59
////////////////////////////////////////////////////////////////////////////////
60
// Implementation specific tracing API definitions.
61
62
// Get a pointer to the enabled state of the given trace category. Only
63
// long-lived literal strings should be given as the category group. The
64
// returned pointer can be held permanently in a local static for example. If
65
// the unsigned char is non-zero, tracing is enabled. If tracing is enabled,
66
// TRACE_EVENT_API_ADD_TRACE_EVENT can be called. It's OK if tracing is disabled
67
// between the load of the tracing state and the call to
68
// TRACE_EVENT_API_ADD_TRACE_EVENT, because this flag only provides an early out
69
// for best performance when tracing is disabled.
70
// const uint8_t*
71
//     TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(const char* category_group)
72
#define TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED              \
73
  node::tracing::TraceEventHelper::GetTracingController()       \
74
      ->GetCategoryGroupEnabled
75
76
// Get the number of times traces have been recorded. This is used to implement
77
// the TRACE_EVENT_IS_NEW_TRACE facility.
78
// unsigned int TRACE_EVENT_API_GET_NUM_TRACES_RECORDED()
79
#define TRACE_EVENT_API_GET_NUM_TRACES_RECORDED UNIMPLEMENTED()
80
81
// Add a trace event to the platform tracing system.
82
// uint64_t TRACE_EVENT_API_ADD_TRACE_EVENT(
83
//                    char phase,
84
//                    const uint8_t* category_group_enabled,
85
//                    const char* name,
86
//                    const char* scope,
87
//                    uint64_t id,
88
//                    uint64_t bind_id,
89
//                    int num_args,
90
//                    const char** arg_names,
91
//                    const uint8_t* arg_types,
92
//                    const uint64_t* arg_values,
93
//                    unsigned int flags)
94
#define TRACE_EVENT_API_ADD_TRACE_EVENT node::tracing::AddTraceEventImpl
95
96
// Add a trace event to the platform tracing system.
97
// uint64_t TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_TIMESTAMP(
98
//                    char phase,
99
//                    const uint8_t* category_group_enabled,
100
//                    const char* name,
101
//                    const char* scope,
102
//                    uint64_t id,
103
//                    uint64_t bind_id,
104
//                    int num_args,
105
//                    const char** arg_names,
106
//                    const uint8_t* arg_types,
107
//                    const uint64_t* arg_values,
108
//                    unsigned int flags,
109
//                    int64_t timestamp)
110
#define TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_TIMESTAMP \
111
  node::tracing::AddTraceEventWithTimestampImpl
112
113
// Set the duration field of a COMPLETE trace event.
114
// void TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(
115
//     const uint8_t* category_group_enabled,
116
//     const char* name,
117
//     uint64_t id)
118
#define TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION             \
119
  node::tracing::TraceEventHelper::GetTracingController()       \
120
      ->UpdateTraceEventDuration
121
122
// Adds a metadata event to the trace log. The |AppendValueAsTraceFormat| method
123
// on the convertable value will be called at flush time.
124
// TRACE_EVENT_API_ADD_METADATA_EVENT(
125
//     const unsigned char* category_group_enabled,
126
//     const char* event_name,
127
//     const char* arg_name,
128
//     std::unique_ptr<ConvertableToTraceFormat> arg_value)
129
#define TRACE_EVENT_API_ADD_METADATA_EVENT node::tracing::AddMetadataEvent
130
131
// Defines atomic operations used internally by the tracing system.
132
#define TRACE_EVENT_API_ATOMIC_WORD std::atomic<intptr_t>
133
#define TRACE_EVENT_API_ATOMIC_WORD_VALUE intptr_t
134
#define TRACE_EVENT_API_ATOMIC_LOAD(var) (var).load()
135
#define TRACE_EVENT_API_ATOMIC_STORE(var, value) (var).store(value)
136
137
////////////////////////////////////////////////////////////////////////////////
138
139
// Implementation detail: trace event macros create temporary variables
140
// to keep instrumentation overhead low. These macros give each temporary
141
// variable a unique name based on the line number to prevent name collisions.
142
#define INTERNAL_TRACE_EVENT_UID3(a, b) trace_event_unique_##a##b
143
#define INTERNAL_TRACE_EVENT_UID2(a, b) INTERNAL_TRACE_EVENT_UID3(a, b)
144
#define INTERNAL_TRACE_EVENT_UID(name_prefix) \
145
  INTERNAL_TRACE_EVENT_UID2(name_prefix, __LINE__)
146
147
// Implementation detail: internal macro to create static category.
148
// No barriers are needed, because this code is designed to operate safely
149
// even when the unsigned char* points to garbage data (which may be the case
150
// on processors without cache coherency).
151
// TODO(fmeawad): This implementation contradicts that we can have a different
152
// configuration for each isolate,
153
// https://code.google.com/p/v8/issues/detail?id=4563
154
#define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO_CUSTOM_VARIABLES(             \
155
    category_group, atomic, category_group_enabled)                          \
156
  category_group_enabled =                                                   \
157
      reinterpret_cast<const uint8_t*>(TRACE_EVENT_API_ATOMIC_LOAD(atomic)); \
158
  if (!category_group_enabled) {                                             \
159
    category_group_enabled =                                                 \
160
        TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);          \
161
    TRACE_EVENT_API_ATOMIC_STORE(                                            \
162
        atomic, reinterpret_cast<TRACE_EVENT_API_ATOMIC_WORD_VALUE>(         \
163
                    category_group_enabled));                                \
164
  }
165
166
#define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group)             \
167
  static TRACE_EVENT_API_ATOMIC_WORD INTERNAL_TRACE_EVENT_UID(atomic) {0}; \
168
  const uint8_t* INTERNAL_TRACE_EVENT_UID(category_group_enabled);         \
169
  INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO_CUSTOM_VARIABLES(                 \
170
      category_group, INTERNAL_TRACE_EVENT_UID(atomic),                    \
171
      INTERNAL_TRACE_EVENT_UID(category_group_enabled));
172
173
// Implementation detail: internal macro to create static category and add
174
// event if the category is enabled.
175
#define INTERNAL_TRACE_EVENT_ADD(phase, category_group, name, flags, ...)    \
176
  do {                                                                       \
177
    INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group);                  \
178
    if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) {  \
179
      node::tracing::AddTraceEvent(                                          \
180
          phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), name,     \
181
          node::tracing::kGlobalScope, node::tracing::kNoId,                 \
182
          node::tracing::kNoId, flags, ##__VA_ARGS__);                       \
183
    }                                                                        \
184
  } while (0)
185
186
// Implementation detail: internal macro to create static category and add begin
187
// event if the category is enabled. Also adds the end event when the scope
188
// ends.
189
#define INTERNAL_TRACE_EVENT_ADD_SCOPED(category_group, name, ...)           \
190
  INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group);                    \
191
  node::tracing::ScopedTracer INTERNAL_TRACE_EVENT_UID(tracer);              \
192
  if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) {    \
193
    uint64_t h = node::tracing::AddTraceEvent(                               \
194
        TRACE_EVENT_PHASE_COMPLETE,                                          \
195
        INTERNAL_TRACE_EVENT_UID(category_group_enabled), name,              \
196
        node::tracing::kGlobalScope, node::tracing::kNoId,                   \
197
        node::tracing::kNoId, TRACE_EVENT_FLAG_NONE, ##__VA_ARGS__);         \
198
    INTERNAL_TRACE_EVENT_UID(tracer)                                         \
199
        .Initialize(INTERNAL_TRACE_EVENT_UID(category_group_enabled), name,  \
200
                    h);                                                      \
201
  }
202
203
#define INTERNAL_TRACE_EVENT_ADD_SCOPED_WITH_FLOW(category_group, name,     \
204
                                                  bind_id, flow_flags, ...) \
205
  INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group);                   \
206
  node::tracing::ScopedTracer INTERNAL_TRACE_EVENT_UID(tracer);             \
207
  if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) {   \
208
    unsigned int trace_event_flags = flow_flags;                            \
209
    node::tracing::TraceID trace_event_bind_id(bind_id,                     \
210
                                               &trace_event_flags);         \
211
    uint64_t h = node::tracing::AddTraceEvent(                              \
212
        TRACE_EVENT_PHASE_COMPLETE,                                         \
213
        INTERNAL_TRACE_EVENT_UID(category_group_enabled), name,             \
214
        node::tracing::kGlobalScope, node::tracing::kNoId,                  \
215
        trace_event_bind_id.raw_id(), trace_event_flags, ##__VA_ARGS__);    \
216
    INTERNAL_TRACE_EVENT_UID(tracer)                                        \
217
        .Initialize(INTERNAL_TRACE_EVENT_UID(category_group_enabled), name, \
218
                    h);                                                     \
219
  }
220
221
// Implementation detail: internal macro to create static category and add
222
// event if the category is enabled.
223
#define INTERNAL_TRACE_EVENT_ADD_WITH_ID(phase, category_group, name, id,      \
224
                                         flags, ...)                           \
225
  do {                                                                         \
226
    INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group);                    \
227
    if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) {    \
228
      unsigned int trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID;        \
229
      node::tracing::TraceID trace_event_trace_id(id,                          \
230
                                                  &trace_event_flags);         \
231
      node::tracing::AddTraceEvent(                                            \
232
          phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), name,       \
233
          trace_event_trace_id.scope(), trace_event_trace_id.raw_id(),         \
234
          node::tracing::kNoId, trace_event_flags, ##__VA_ARGS__);             \
235
    }                                                                          \
236
  } while (0)
237
238
// Adds a trace event with a given timestamp.
239
#define INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(phase, category_group, name, \
240
                                                timestamp, flags, ...)       \
241
  do {                                                                       \
242
    INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group);                  \
243
    if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) {  \
244
      node::tracing::AddTraceEventWithTimestamp(                     \
245
          phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), name,     \
246
          node::tracing::kGlobalScope, node::tracing::kNoId, \
247
          node::tracing::kNoId, flags, timestamp, ##__VA_ARGS__);    \
248
    }                                                                        \
249
  } while (0)
250
251
// Adds a trace event with a given id and timestamp. Not Implemented.
252
#define INTERNAL_TRACE_EVENT_ADD_WITH_ID_AND_TIMESTAMP(     \
253
    phase, category_group, name, id, timestamp, flags, ...) \
254
  UNIMPLEMENTED()
255
256
// Adds a trace event with a given id, thread_id, and timestamp. Not
257
// Implemented.
258
#define INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                  \
259
    phase, category_group, name, id, thread_id, timestamp, flags, ...)       \
260
  do {                                                                       \
261
    INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group);                  \
262
    if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) {  \
263
      unsigned int trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID;      \
264
      node::tracing::TraceID trace_event_trace_id(id,                        \
265
                                                  &trace_event_flags);       \
266
      node::tracing::AddTraceEventWithTimestamp(                             \
267
          phase, INTERNAL_TRACE_EVENT_UID(category_group_enabled), name,     \
268
          trace_event_trace_id.scope(), trace_event_trace_id.raw_id(),       \
269
          node::tracing::kNoId, trace_event_flags, timestamp, ##__VA_ARGS__);\
270
    }                                                                        \
271
  } while (0)
272
273
#define INTERNAL_TRACE_EVENT_METADATA_ADD(category_group, name, ...)  \
274
  do { \
275
    INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group); \
276
    if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \
277
      TRACE_EVENT_API_ADD_METADATA_EVENT( \
278
          INTERNAL_TRACE_EVENT_UID(category_group_enabled), name, \
279
          ##__VA_ARGS__); \
280
    } \
281
  } while(0)
282
283
// Enter and leave a context based on the current scope.
284
#define INTERNAL_TRACE_EVENT_SCOPED_CONTEXT(category_group, name, context) \
285
  struct INTERNAL_TRACE_EVENT_UID(ScopedContext) {                         \
286
   public:                                                                 \
287
    INTERNAL_TRACE_EVENT_UID(ScopedContext)(uint64_t cid) : cid_(cid) {    \
288
      TRACE_EVENT_ENTER_CONTEXT(category_group, name, cid_);               \
289
    }                                                                      \
290
    ~INTERNAL_TRACE_EVENT_UID(ScopedContext)() {                           \
291
      TRACE_EVENT_LEAVE_CONTEXT(category_group, name, cid_);               \
292
    }                                                                      \
293
                                                                           \
294
   private:                                                                \
295
    /* Local class friendly DISALLOW_COPY_AND_ASSIGN */                    \
296
    INTERNAL_TRACE_EVENT_UID(ScopedContext)                                \
297
    (const INTERNAL_TRACE_EVENT_UID(ScopedContext)&) {}                    \
298
    void operator=(const INTERNAL_TRACE_EVENT_UID(ScopedContext)&) {}      \
299
    uint64_t cid_;                                                         \
300
  };                                                                       \
301
  INTERNAL_TRACE_EVENT_UID(ScopedContext)                                  \
302
  INTERNAL_TRACE_EVENT_UID(scoped_context)(context);
303
304
namespace node {
305
namespace tracing {
306
307
// Specify these values when the corresponding argument of AddTraceEvent is not
308
// used.
309
const int kZeroNumArgs = 0;
310
const decltype(nullptr) kGlobalScope = nullptr;
311
const uint64_t kNoId = 0;
312
313
// Extern (for now) because embedders need access to TraceEventHelper.
314
// Refs: https://github.com/nodejs/node/pull/28724
315
class NODE_EXTERN TraceEventHelper {
316
 public:
317
  static v8::TracingController* GetTracingController();
318
  static void SetTracingController(v8::TracingController* controller);
319
320
  static Agent* GetAgent();
321
  static void SetAgent(Agent* agent);
322
};
323
324
// TraceID encapsulates an ID that can either be an integer or pointer. Pointers
325
// are by default mangled with the Process ID so that they are unlikely to
326
// collide when the same pointer is used on different processes.
327
class TraceID {
328
 public:
329
  class WithScope {
330
   public:
331
    WithScope(const char* scope, uint64_t raw_id)
332
        : scope_(scope), raw_id_(raw_id) {}
333
    uint64_t raw_id() const { return raw_id_; }
334
    const char* scope() const { return scope_; }
335
336
   private:
337
    const char* scope_ = nullptr;
338
    uint64_t raw_id_;
339
  };
340
341
  class DontMangle {
342
   public:
343
    explicit DontMangle(const void* raw_id)
344
        : raw_id_(static_cast<uint64_t>(reinterpret_cast<uintptr_t>(raw_id))) {}
345
    explicit DontMangle(uint64_t raw_id) : raw_id_(raw_id) {}
346
    explicit DontMangle(unsigned int raw_id) : raw_id_(raw_id) {}
347
    explicit DontMangle(uint16_t raw_id) : raw_id_(raw_id) {}
348
    explicit DontMangle(unsigned char raw_id) : raw_id_(raw_id) {}
349
    explicit DontMangle(int64_t raw_id)
350
        : raw_id_(static_cast<uint64_t>(raw_id)) {}
351
    explicit DontMangle(int raw_id) : raw_id_(static_cast<uint64_t>(raw_id)) {}
352
    explicit DontMangle(int16_t raw_id)
353
        : raw_id_(static_cast<uint64_t>(raw_id)) {}
354
    explicit DontMangle(signed char raw_id)
355
        : raw_id_(static_cast<uint64_t>(raw_id)) {}
356
    explicit DontMangle(WithScope scoped_id)
357
        : scope_(scoped_id.scope()), raw_id_(scoped_id.raw_id()) {}
358
    const char* scope() const { return scope_; }
359
    uint64_t raw_id() const { return raw_id_; }
360
361
   private:
362
    const char* scope_ = nullptr;
363
    uint64_t raw_id_;
364
  };
365
366
  class ForceMangle {
367
   public:
368
    explicit ForceMangle(uint64_t raw_id) : raw_id_(raw_id) {}
369
    explicit ForceMangle(unsigned int raw_id) : raw_id_(raw_id) {}
370
    explicit ForceMangle(uint16_t raw_id) : raw_id_(raw_id) {}
371
    explicit ForceMangle(unsigned char raw_id) : raw_id_(raw_id) {}
372
    explicit ForceMangle(int64_t raw_id)
373
        : raw_id_(static_cast<uint64_t>(raw_id)) {}
374
    explicit ForceMangle(int raw_id) : raw_id_(static_cast<uint64_t>(raw_id)) {}
375
    explicit ForceMangle(int16_t raw_id)
376
        : raw_id_(static_cast<uint64_t>(raw_id)) {}
377
    explicit ForceMangle(signed char raw_id)
378
        : raw_id_(static_cast<uint64_t>(raw_id)) {}
379
    uint64_t raw_id() const { return raw_id_; }
380
381
   private:
382
    uint64_t raw_id_;
383
  };
384
385
210
  TraceID(const void* raw_id, unsigned int* flags)
386
210
      : raw_id_(static_cast<uint64_t>(reinterpret_cast<uintptr_t>(raw_id))) {
387
210
    *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
388
210
  }
389
  TraceID(ForceMangle raw_id, unsigned int* flags) : raw_id_(raw_id.raw_id()) {
390
    *flags |= TRACE_EVENT_FLAG_MANGLE_ID;
391
  }
392
  TraceID(DontMangle maybe_scoped_id, unsigned int* flags)
393
      : scope_(maybe_scoped_id.scope()), raw_id_(maybe_scoped_id.raw_id()) {}
394
  TraceID(uint64_t raw_id, unsigned int* flags) : raw_id_(raw_id) {
395
    (void)flags;
396
  }
397
  TraceID(unsigned int raw_id, unsigned int* flags) : raw_id_(raw_id) {
398
    (void)flags;
399
  }
400
  TraceID(uint16_t raw_id, unsigned int* flags) : raw_id_(raw_id) {
401
    (void)flags;
402
  }
403
  TraceID(unsigned char raw_id, unsigned int* flags) : raw_id_(raw_id) {
404
    (void)flags;
405
  }
406
89
  TraceID(int64_t raw_id, unsigned int* flags)
407
89
      : raw_id_(static_cast<uint64_t>(raw_id)) {
408
    (void)flags;
409
89
  }
410
  TraceID(int raw_id, unsigned int* flags)
411
      : raw_id_(static_cast<uint64_t>(raw_id)) {
412
    (void)flags;
413
  }
414
  TraceID(int16_t raw_id, unsigned int* flags)
415
      : raw_id_(static_cast<uint64_t>(raw_id)) {
416
    (void)flags;
417
  }
418
  TraceID(signed char raw_id, unsigned int* flags)
419
      : raw_id_(static_cast<uint64_t>(raw_id)) {
420
    (void)flags;
421
  }
422
  TraceID(WithScope scoped_id, unsigned int* flags)
423
      : scope_(scoped_id.scope()), raw_id_(scoped_id.raw_id()) {}
424
425
299
  uint64_t raw_id() const { return raw_id_; }
426
299
  const char* scope() const { return scope_; }
427
428
 private:
429
  const char* scope_ = nullptr;
430
  uint64_t raw_id_;
431
};
432
433
// Simple union to store various types as uint64_t.
434
union TraceValueUnion {
435
  bool as_bool;
436
  uint64_t as_uint;
437
  int64_t as_int;
438
  double as_double;
439
  const void* as_pointer;
440
  const char* as_string;
441
};
442
443
// Simple container for const char* that should be copied instead of retained.
444
class TraceStringWithCopy {
445
 public:
446
67
  explicit TraceStringWithCopy(const char* str) : str_(str) {}
447
67
  operator const char*() const { return str_; }
448
449
 private:
450
  const char* str_;
451
};
452
453
642
static inline uint64_t AddTraceEventImpl(
454
    char phase, const uint8_t* category_group_enabled, const char* name,
455
    const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
456
    const char** arg_names, const uint8_t* arg_types,
457
    const uint64_t* arg_values, unsigned int flags) {
458
1284
  std::unique_ptr<v8::ConvertableToTraceFormat> arg_convertibles[2];
459

642
  if (num_args > 0 && arg_types[0] == TRACE_VALUE_TYPE_CONVERTABLE) {
460
33
    arg_convertibles[0].reset(reinterpret_cast<v8::ConvertableToTraceFormat*>(
461
66
        static_cast<intptr_t>(arg_values[0])));
462
  }
463

642
  if (num_args > 1 && arg_types[1] == TRACE_VALUE_TYPE_CONVERTABLE) {
464
    arg_convertibles[1].reset(reinterpret_cast<v8::ConvertableToTraceFormat*>(
465
        static_cast<intptr_t>(arg_values[1])));
466
  }
467
  // DCHECK(num_args, 2);
468
  v8::TracingController* controller =
469
642
      node::tracing::TraceEventHelper::GetTracingController();
470
642
  return controller->AddTraceEvent(phase, category_group_enabled, name, scope, id,
471
                                   bind_id, num_args, arg_names, arg_types,
472
1926
                                   arg_values, arg_convertibles, flags);
473
}
474
475
static V8_INLINE uint64_t AddTraceEventWithTimestampImpl(
476
    char phase, const uint8_t* category_group_enabled, const char* name,
477
    const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args,
478
    const char** arg_names, const uint8_t* arg_types,
479
    const uint64_t* arg_values, unsigned int flags, int64_t timestamp) {
480



130
  std::unique_ptr<v8::ConvertableToTraceFormat> arg_convertables[2];
481






65
  if (num_args > 0 && arg_types[0] == TRACE_VALUE_TYPE_CONVERTABLE) {
482
    arg_convertables[0].reset(reinterpret_cast<v8::ConvertableToTraceFormat*>(
483
        static_cast<intptr_t>(arg_values[0])));
484
  }
485






65
  if (num_args > 1 && arg_types[1] == TRACE_VALUE_TYPE_CONVERTABLE) {
486
    arg_convertables[1].reset(reinterpret_cast<v8::ConvertableToTraceFormat*>(
487
        static_cast<intptr_t>(arg_values[1])));
488
  }
489
  // DCHECK_LE(num_args, 2);
490
  v8::TracingController* controller =
491
65
      node::tracing::TraceEventHelper::GetTracingController();
492
65
  return controller->AddTraceEventWithTimestamp(
493
      phase, category_group_enabled, name, scope, id, bind_id, num_args,
494
130
      arg_names, arg_types, arg_values, arg_convertables, flags, timestamp);
495
}
496
497
static V8_INLINE void AddMetadataEventImpl(
498
    const uint8_t* category_group_enabled, const char* name, int32_t num_args,
499
    const char** arg_names, const uint8_t* arg_types,
500
    const uint64_t* arg_values, unsigned int flags) {
501


982
  std::unique_ptr<v8::ConvertableToTraceFormat> arg_convertibles[2];
502




491
  if (num_args > 0 && arg_types[0] == TRACE_VALUE_TYPE_CONVERTABLE) {
503
57
    arg_convertibles[0].reset(reinterpret_cast<v8::ConvertableToTraceFormat*>(
504
114
        static_cast<intptr_t>(arg_values[0])));
505
  }
506




490
  if (num_args > 1 && arg_types[1] == TRACE_VALUE_TYPE_CONVERTABLE) {
507
    arg_convertibles[1].reset(reinterpret_cast<v8::ConvertableToTraceFormat*>(
508
        static_cast<intptr_t>(arg_values[1])));
509
  }
510
  node::tracing::Agent* agent =
511
490
      node::tracing::TraceEventHelper::GetAgent();
512


491
  if (agent == nullptr) return;
513
491
  return agent->GetTracingController()->AddMetadataEvent(
514
      category_group_enabled, name, num_args, arg_names, arg_types, arg_values,
515
491
      arg_convertibles, flags);
516
}
517
518
// Define SetTraceValue for each allowed type. It stores the type and
519
// value in the return arguments. This allows this API to avoid declaring any
520
// structures so that it is portable to third_party libraries.
521
#define INTERNAL_DECLARE_SET_TRACE_VALUE(actual_type, union_member,         \
522
                                         value_type_id)                     \
523
  static inline void SetTraceValue(actual_type arg, unsigned char* type,    \
524
                                   uint64_t* value) {                       \
525
    TraceValueUnion type_value;                                             \
526
    type_value.union_member = arg;                                          \
527
    *type = value_type_id;                                                  \
528
    *value = type_value.as_uint;                                            \
529
  }
530
// Simpler form for int types that can be safely casted.
531
#define INTERNAL_DECLARE_SET_TRACE_VALUE_INT(actual_type, value_type_id)    \
532
  static inline void SetTraceValue(actual_type arg, unsigned char* type,    \
533
                                   uint64_t* value) {                       \
534
    *type = value_type_id;                                                  \
535
    *value = static_cast<uint64_t>(arg);                                    \
536
  }
537
538
INTERNAL_DECLARE_SET_TRACE_VALUE_INT(uint64_t, TRACE_VALUE_TYPE_UINT)
539
INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned int, TRACE_VALUE_TYPE_UINT)
540
INTERNAL_DECLARE_SET_TRACE_VALUE_INT(uint16_t, TRACE_VALUE_TYPE_UINT)
541
INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned char, TRACE_VALUE_TYPE_UINT)
542
INTERNAL_DECLARE_SET_TRACE_VALUE_INT(int64_t, TRACE_VALUE_TYPE_INT)
543
36
INTERNAL_DECLARE_SET_TRACE_VALUE_INT(int, TRACE_VALUE_TYPE_INT)
544
INTERNAL_DECLARE_SET_TRACE_VALUE_INT(int16_t, TRACE_VALUE_TYPE_INT)
545
INTERNAL_DECLARE_SET_TRACE_VALUE_INT(signed char, TRACE_VALUE_TYPE_INT)
546
INTERNAL_DECLARE_SET_TRACE_VALUE(bool, as_bool, TRACE_VALUE_TYPE_BOOL)
547
INTERNAL_DECLARE_SET_TRACE_VALUE(double, as_double, TRACE_VALUE_TYPE_DOUBLE)
548
INTERNAL_DECLARE_SET_TRACE_VALUE(const void*, as_pointer,
549
                                 TRACE_VALUE_TYPE_POINTER)
550
374
INTERNAL_DECLARE_SET_TRACE_VALUE(const char*, as_string,
551
                                 TRACE_VALUE_TYPE_STRING)
552
67
INTERNAL_DECLARE_SET_TRACE_VALUE(const TraceStringWithCopy&, as_string,
553
                                 TRACE_VALUE_TYPE_COPY_STRING)
554
555
#undef INTERNAL_DECLARE_SET_TRACE_VALUE
556
#undef INTERNAL_DECLARE_SET_TRACE_VALUE_INT
557
558
90
static inline void SetTraceValue(v8::ConvertableToTraceFormat* convertable_value,
559
                                    unsigned char* type, uint64_t* value) {
560
90
  *type = TRACE_VALUE_TYPE_CONVERTABLE;
561
90
  *value = static_cast<uint64_t>(reinterpret_cast<intptr_t>(convertable_value));
562
90
}
563
564
template <typename T>
565
static inline typename std::enable_if<
566
    std::is_convertible<T*, v8::ConvertableToTraceFormat*>::value>::type
567
90
SetTraceValue(std::unique_ptr<T> ptr, unsigned char* type, uint64_t* value) {
568
90
  SetTraceValue(ptr.release(), type, value);
569
90
}
570
571
// These AddTraceEvent template
572
// function is defined here instead of in the macro, because the arg_values
573
// could be temporary objects, such as std::string. In order to store
574
// pointers to the internal c_str and pass through to the tracing API,
575
// the arg_values must live throughout these procedures.
576
577
569
static inline uint64_t AddTraceEvent(char phase,
578
                                        const uint8_t* category_group_enabled,
579
                                        const char* name, const char* scope,
580
                                        uint64_t id, uint64_t bind_id,
581
                                        unsigned int flags) {
582
569
  return TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_group_enabled, name,
583
                                         scope, id, bind_id, kZeroNumArgs,
584
569
                                         nullptr, nullptr, nullptr, flags);
585
}
586
587
template <class ARG1_TYPE>
588
70
static inline uint64_t AddTraceEvent(
589
    char phase, const uint8_t* category_group_enabled, const char* name,
590
    const char* scope, uint64_t id, uint64_t bind_id, unsigned int flags,
591
    const char* arg1_name, ARG1_TYPE&& arg1_val) {
592
70
  const int num_args = 1;
593
  uint8_t arg_type;
594
  uint64_t arg_value;
595
70
  SetTraceValue(std::forward<ARG1_TYPE>(arg1_val), &arg_type, &arg_value);
596
70
  return TRACE_EVENT_API_ADD_TRACE_EVENT(
597
      phase, category_group_enabled, name, scope, id, bind_id, num_args,
598
70
      &arg1_name, &arg_type, &arg_value, flags);
599
}
600
601
template <class ARG1_TYPE, class ARG2_TYPE>
602
3
static inline uint64_t AddTraceEvent(
603
    char phase, const uint8_t* category_group_enabled, const char* name,
604
    const char* scope, uint64_t id, uint64_t bind_id, unsigned int flags,
605
    const char* arg1_name, ARG1_TYPE&& arg1_val, const char* arg2_name,
606
    ARG2_TYPE&& arg2_val) {
607
3
  const int num_args = 2;
608
3
  const char* arg_names[2] = {arg1_name, arg2_name};
609
  unsigned char arg_types[2];
610
  uint64_t arg_values[2];
611
3
  SetTraceValue(std::forward<ARG1_TYPE>(arg1_val), &arg_types[0],
612
                &arg_values[0]);
613
3
  SetTraceValue(std::forward<ARG2_TYPE>(arg2_val), &arg_types[1],
614
                &arg_values[1]);
615
3
  return TRACE_EVENT_API_ADD_TRACE_EVENT(
616
      phase, category_group_enabled, name, scope, id, bind_id, num_args,
617
3
      arg_names, arg_types, arg_values, flags);
618
}
619
620
static V8_INLINE uint64_t AddTraceEventWithTimestamp(
621
    char phase, const uint8_t* category_group_enabled, const char* name,
622
    const char* scope, uint64_t id, uint64_t bind_id, unsigned int flags,
623
    int64_t timestamp) {
624
65
  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_TIMESTAMP(
625
      phase, category_group_enabled, name, scope, id, bind_id, kZeroNumArgs,
626
65
      nullptr, nullptr, nullptr, flags, timestamp);
627
}
628
629
template <class ARG1_TYPE>
630
static V8_INLINE uint64_t AddTraceEventWithTimestamp(
631
    char phase, const uint8_t* category_group_enabled, const char* name,
632
    const char* scope, uint64_t id, uint64_t bind_id, unsigned int flags,
633
    int64_t timestamp, const char* arg1_name, ARG1_TYPE&& arg1_val) {
634
  const int num_args = 1;
635
  uint8_t arg_type;
636
  uint64_t arg_value;
637
  SetTraceValue(std::forward<ARG1_TYPE>(arg1_val), &arg_type, &arg_value);
638
  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_TIMESTAMP(
639
      phase, category_group_enabled, name, scope, id, bind_id, num_args,
640
      &arg1_name, &arg_type, &arg_value, flags, timestamp);
641
}
642
643
template <class ARG1_TYPE, class ARG2_TYPE>
644
static V8_INLINE uint64_t AddTraceEventWithTimestamp(
645
    char phase, const uint8_t* category_group_enabled, const char* name,
646
    const char* scope, uint64_t id, uint64_t bind_id, unsigned int flags,
647
    int64_t timestamp, const char* arg1_name, ARG1_TYPE&& arg1_val,
648
    const char* arg2_name, ARG2_TYPE&& arg2_val) {
649
  const int num_args = 2;
650
  const char* arg_names[2] = {arg1_name, arg2_name};
651
  unsigned char arg_types[2];
652
  uint64_t arg_values[2];
653
  SetTraceValue(std::forward<ARG1_TYPE>(arg1_val), &arg_types[0],
654
                &arg_values[0]);
655
  SetTraceValue(std::forward<ARG2_TYPE>(arg2_val), &arg_types[1],
656
                &arg_values[1]);
657
  return TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_TIMESTAMP(
658
      phase, category_group_enabled, name, scope, id, bind_id, num_args,
659
      arg_names, arg_types, arg_values, flags, timestamp);
660
}
661
662
template <class ARG1_TYPE>
663
static V8_INLINE void AddMetadataEvent(
664
    const uint8_t* category_group_enabled, const char* name,
665
    const char* arg1_name, ARG1_TYPE&& arg1_val) {
666
491
  const int num_args = 1;
667
  uint8_t arg_type;
668
  uint64_t arg_value;
669
491
  SetTraceValue(std::forward<ARG1_TYPE>(arg1_val), &arg_type, &arg_value);
670
  AddMetadataEventImpl(
671
      category_group_enabled, name, num_args, &arg1_name, &arg_type, &arg_value,
672
      TRACE_EVENT_FLAG_NONE);
673
}
674
675
// Used by TRACE_EVENTx macros. Do not use directly.
676
class ScopedTracer {
677
 public:
678
  // Note: members of data_ intentionally left uninitialized. See Initialize.
679
  ScopedTracer() : p_data_(nullptr) {}
680
681
  ~ScopedTracer() {
682
    if (p_data_ && *data_.category_group_enabled)
683
      TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(
684
          data_.category_group_enabled, data_.name, data_.event_handle);
685
  }
686
687
  void Initialize(const uint8_t* category_group_enabled, const char* name,
688
                  uint64_t event_handle) {
689
    data_.category_group_enabled = category_group_enabled;
690
    data_.name = name;
691
    data_.event_handle = event_handle;
692
    p_data_ = &data_;
693
  }
694
695
 private:
696
  // This Data struct workaround is to avoid initializing all the members
697
  // in Data during construction of this object, since this object is always
698
  // constructed, even when tracing is disabled. If the members of Data were
699
  // members of this class instead, compiler warnings occur about potential
700
  // uninitialized accesses.
701
  struct Data {
702
    const uint8_t* category_group_enabled;
703
    const char* name;
704
    uint64_t event_handle;
705
  };
706
  Data* p_data_;
707
  Data data_;
708
};
709
710
}  // namespace tracing
711
}  // namespace node
712
713
#endif  // SRC_TRACING_TRACE_EVENT_H_