summaryrefslogtreecommitdiff
path: root/tools/profiler/public/GeckoProfiler.h
blob: bef017d11558baf9c4a86ab68cb844849b2b359d (plain)
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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* *************** SPS Sampler Information ****************
 *
 * SPS is an always on profiler that takes fast and low overheads samples
 * of the program execution using only userspace functionity for portability.
 * The goal of this module is to provide performance data in a generic
 * cross platform way without requiring custom tools or kernel support.
 *
 * Non goals: Support features that are platform specific or replace
 *            platform specific profilers.
 *
 * Samples are collected to form a timeline with optional timeline event (markers)
 * used for filtering.
 *
 * SPS collects samples in a platform independant way by using a speudo stack abstraction
 * of the real program stack by using 'sample stack frames'. When a sample is collected
 * all active sample stack frames and the program counter are recorded.
 */

/* *************** SPS Sampler File Format ****************
 *
 * Simple new line seperated tag format:
 * S      -> BOF tags EOF
 * tags   -> tag tags
 * tag    -> CHAR - STRING
 *
 * Tags:
 * 's' - Sample tag followed by the first stack frame followed by 0 or more 'c' tags.
 * 'c' - Continue Sample tag gives remaining tag element. If a 'c' tag is seen without
 *         a preceding 's' tag it should be ignored. This is to support the behavior
 *         of circular buffers.
 *         If the 'stackwalk' feature is enabled this tag will have the format
 *         'l-<library name>@<hex address>' and will expect an external tool to translate
 *         the tag into something readable through a symbolication processing step.
 * 'm' - Timeline marker. Zero or more may appear before a 's' tag.
 * 'l' - Information about the program counter library and address. Post processing
 *         can include function and source line. If built with leaf data enabled
 *         this tag will describe the last 'c' tag.
 * 'r' - Responsiveness tag following an 's' tag. Gives an indication on how well the
 *          application is responding to the event loop. Lower is better.
 * 't' - Elapse time since recording started.
 *
 */

#ifndef SAMPLER_H
#define SAMPLER_H

#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#ifndef SPS_STANDALONE
#include "js/TypeDecls.h"
#endif
#include "mozilla/UniquePtr.h"
#include "mozilla/Vector.h"

namespace mozilla {
class TimeStamp;

namespace dom {
class Promise;
} // namespace dom

} // namespace mozilla

#ifndef SPS_STANDALONE
class nsIProfilerStartParams;
#endif

enum TracingMetadata {
  TRACING_DEFAULT,
  TRACING_INTERVAL_START,
  TRACING_INTERVAL_END,
  TRACING_EVENT,
  TRACING_EVENT_BACKTRACE,
  TRACING_TIMESTAMP
};

#if !defined(MOZ_ENABLE_PROFILER_SPS)

#include <stdint.h>
#include <stdarg.h>

// Insert a RAII in this scope to active a pseudo label. Any samples collected
// in this scope will contain this annotation. For dynamic strings use
// PROFILER_LABEL_PRINTF. Arguments must be string literals.
#define PROFILER_LABEL(name_space, info, category) do {} while (0)

// Similar to PROFILER_LABEL, PROFILER_LABEL_FUNC will push/pop the enclosing
// functon name as the pseudostack label.
#define PROFILER_LABEL_FUNC(category) do {} while (0)

// Format a dynamic string as a pseudo label. These labels will a considerable
// storage size in the circular buffer compared to regular labels. This function
// can be used to annotate custom information such as URL for the resource being
// decoded or the size of the paint.
#define PROFILER_LABEL_PRINTF(name_space, info, category, format, ...) do {} while (0)

// Insert a marker in the profile timeline. This is useful to delimit something
// important happening such as the first paint. Unlike profiler_label that are
// only recorded if a sample is collected while it is active, marker will always
// be collected.
#define PROFILER_MARKER(info) do {} while (0)
#define PROFILER_MARKER_PAYLOAD(info, payload) do { mozilla::UniquePtr<ProfilerMarkerPayload> payloadDeletor(payload); } while (0)

// Main thread specilization to avoid TLS lookup for performance critical use.
#define PROFILER_MAIN_THREAD_LABEL(name_space, info, category) do {} while (0)
#define PROFILER_MAIN_THREAD_LABEL_PRINTF(name_space, info, category, format, ...) do {} while (0)

static inline void profiler_tracing(const char* aCategory, const char* aInfo,
                                    TracingMetadata metaData = TRACING_DEFAULT) {}
class ProfilerBacktrace;

static inline void profiler_tracing(const char* aCategory, const char* aInfo,
                                    ProfilerBacktrace* aCause,
                                    TracingMetadata metaData = TRACING_DEFAULT) {}

// Initilize the profiler TLS, signal handlers on linux. If MOZ_PROFILER_STARTUP
// is set the profiler will be started. This call must happen before any other
// sampler calls. Particularly sampler_label/sampler_marker.
static inline void profiler_init(void* stackTop) {};

// Clean up the profiler module, stopping it if required. This function may
// also save a shutdown profile if requested. No profiler calls should happen
// after this point and all pseudo labels should have been popped.
static inline void profiler_shutdown() {};

// Start the profiler with the selected options. The samples will be
// recorded in a circular buffer.
//   "aProfileEntries" is an abstract size indication of how big
//       the profile's circular buffer should be. Multiply by 4
//       words to get the cost.
//   "aInterval" the sampling interval. The profiler will do its
//       best to sample at this interval. The profiler visualization
//       should represent the actual sampling accuracy.
static inline void profiler_start(int aProfileEntries, double aInterval,
                              const char** aFeatures, uint32_t aFeatureCount,
                              const char** aThreadNameFilters, uint32_t aFilterCount) {}

// Stop the profiler and discard the profile. Call 'profiler_save' before this
// to retrieve the profile.
static inline void profiler_stop() {}

// These functions pause and resume the profiler. While paused the profile will not
// take any samples and will not record any data into its buffers. The profiler
// remains fully initialized in this state. Timeline markers will still be stored.
// This feature will keep javascript profiling enabled, thus allowing toggling the
// profiler without invalidating the JIT.
static inline bool profiler_is_paused() { return false; }
static inline void profiler_pause() {}
static inline void profiler_resume() {}


// Immediately capture the current thread's call stack and return it
static inline ProfilerBacktrace* profiler_get_backtrace() { return nullptr; }
static inline void profiler_get_backtrace_noalloc(char *output, size_t outputSize) { return; }

// Free a ProfilerBacktrace returned by profiler_get_backtrace()
static inline void profiler_free_backtrace(ProfilerBacktrace* aBacktrace) {}

static inline bool profiler_is_active() { return false; }

// Check if an external profiler feature is active.
// Supported:
//  * gpu
static inline bool profiler_feature_active(const char*) { return false; }

// Internal-only. Used by the event tracer.
static inline void profiler_responsiveness(const mozilla::TimeStamp& aTime) {}

// Internal-only.
static inline void profiler_set_frame_number(int frameNumber) {}

// Get the profile encoded as a JSON string.
static inline mozilla::UniquePtr<char[]> profiler_get_profile(double aSinceTime = 0) {
  return nullptr;
}

// Get the profile encoded as a JSON object.
static inline JSObject* profiler_get_profile_jsobject(JSContext* aCx,
                                                      double aSinceTime = 0) {
  return nullptr;
}

#ifndef SPS_STANDALONE
// Get the profile encoded as a JSON object.
static inline void profiler_get_profile_jsobject_async(double aSinceTime = 0,
                                                       mozilla::dom::Promise* = 0) {}
static inline void profiler_get_start_params(int* aEntrySize,
                                             double* aInterval,
                                             mozilla::Vector<const char*>* aFilters,
                                             mozilla::Vector<const char*>* aFeatures) {}
#endif

// Get the profile and write it into a file
static inline void profiler_save_profile_to_file(char* aFilename) { }

// Get the features supported by the profiler that are accepted by profiler_init.
// Returns a null terminated char* array.
static inline char** profiler_get_features() { return nullptr; }

// Get information about the current buffer status.
// Retursn (using outparams) the current write position in the buffer,
// the total size of the buffer, and the generation of the buffer.
// This information may be useful to a user-interface displaying the
// current status of the profiler, allowing the user to get a sense
// for how fast the buffer is being written to, and how much
// data is visible.
static inline void profiler_get_buffer_info(uint32_t *aCurrentPosition,
                                            uint32_t *aTotalSize,
                                            uint32_t *aGeneration)
{
  *aCurrentPosition = 0;
  *aTotalSize = 0;
  *aGeneration = 0;
}

// Discard the profile, throw away the profile and notify 'profiler-locked'.
// This function is to be used when entering private browsing to prevent
// the profiler from collecting sensitive data.
static inline void profiler_lock() {}

// Re-enable the profiler and notify 'profiler-unlocked'.
static inline void profiler_unlock() {}

static inline void profiler_register_thread(const char* name, void* guessStackTop) {}
static inline void profiler_unregister_thread() {}

// These functions tell the profiler that a thread went to sleep so that we can avoid
// sampling it while it's sleeping. Calling profiler_sleep_start() twice without
// profiler_sleep_end() is an error.
static inline void profiler_sleep_start() {}
static inline void profiler_sleep_end() {}
static inline bool profiler_is_sleeping() { return false; }

// Call by the JSRuntime's operation callback. This is used to enable
// profiling on auxilerary threads.
static inline void profiler_js_operation_callback() {}

static inline double profiler_time() { return 0; }
static inline double profiler_time(const mozilla::TimeStamp& aTime) { return 0; }

static inline bool profiler_in_privacy_mode() { return false; }

static inline void profiler_log(const char *str) {}
static inline void profiler_log(const char *fmt, va_list args) {}

#else

#include "GeckoProfilerImpl.h"

#endif

class MOZ_RAII GeckoProfilerInitRAII {
public:
  explicit GeckoProfilerInitRAII(void* stackTop) {
    profiler_init(stackTop);
  }
  ~GeckoProfilerInitRAII() {
    profiler_shutdown();
  }
};

class MOZ_RAII GeckoProfilerSleepRAII {
public:
  GeckoProfilerSleepRAII() {
    profiler_sleep_start();
  }
  ~GeckoProfilerSleepRAII() {
    profiler_sleep_end();
  }
};

/**
 * Temporarily wake up the profiler while servicing events such as
 * Asynchronous Procedure Calls (APCs).
 */
class MOZ_RAII GeckoProfilerWakeRAII {
public:
  GeckoProfilerWakeRAII()
    : mIssuedWake(profiler_is_sleeping())
  {
    if (mIssuedWake) {
      profiler_sleep_end();
    }
  }
  ~GeckoProfilerWakeRAII() {
    if (mIssuedWake) {
      MOZ_ASSERT(!profiler_is_sleeping());
      profiler_sleep_start();
    }
  }
private:
  bool mIssuedWake;
};

#endif // ifndef SAMPLER_H