Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 1 | // Copyright 2013 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 V8_PROFILER_TICK_SAMPLE_H_ |
| 6 | #define V8_PROFILER_TICK_SAMPLE_H_ |
| 7 | |
| 8 | #include "include/v8.h" |
| 9 | |
| 10 | #include "src/base/platform/time.h" |
| 11 | #include "src/frames.h" |
| 12 | #include "src/globals.h" |
| 13 | |
| 14 | namespace v8 { |
| 15 | namespace internal { |
| 16 | |
| 17 | class Isolate; |
| 18 | |
| 19 | // ---------------------------------------------------------------------------- |
| 20 | // Sampler |
| 21 | // |
| 22 | // A sampler periodically samples the state of the VM and optionally |
| 23 | // (if used for profiling) the program counter and stack pointer for |
| 24 | // the thread that created it. |
| 25 | |
| 26 | // TickSample captures the information collected for each sample. |
| 27 | struct TickSample { |
| 28 | // Internal profiling (with --prof + tools/$OS-tick-processor) wants to |
| 29 | // include the runtime function we're calling. Externally exposed tick |
| 30 | // samples don't care. |
| 31 | enum RecordCEntryFrame { kIncludeCEntryFrame, kSkipCEntryFrame }; |
| 32 | |
| 33 | TickSample() |
| 34 | : state(OTHER), |
| 35 | pc(NULL), |
| 36 | external_callback_entry(NULL), |
| 37 | frames_count(0), |
| 38 | has_external_callback(false), |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 39 | update_stats(true) {} |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 40 | void Init(Isolate* isolate, const v8::RegisterState& state, |
| 41 | RecordCEntryFrame record_c_entry_frame, bool update_stats); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 42 | static bool GetStackSample(Isolate* isolate, const v8::RegisterState& state, |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 43 | RecordCEntryFrame record_c_entry_frame, |
| 44 | void** frames, size_t frames_limit, |
| 45 | v8::SampleInfo* sample_info); |
| 46 | StateTag state; // The state of the VM. |
| 47 | Address pc; // Instruction pointer. |
| 48 | union { |
| 49 | Address tos; // Top stack value (*sp). |
| 50 | Address external_callback_entry; |
| 51 | }; |
| 52 | static const unsigned kMaxFramesCountLog2 = 8; |
| 53 | static const unsigned kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1; |
| 54 | Address stack[kMaxFramesCount]; // Call stack. |
| 55 | base::TimeTicks timestamp; |
| 56 | unsigned frames_count : kMaxFramesCountLog2; // Number of captured frames. |
| 57 | bool has_external_callback : 1; |
| 58 | bool update_stats : 1; // Whether the sample should update aggregated stats. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 59 | }; |
| 60 | |
| 61 | |
| 62 | #if defined(USE_SIMULATOR) |
| 63 | class SimulatorHelper { |
| 64 | public: |
| 65 | // Returns true if register values were successfully retrieved |
| 66 | // from the simulator, otherwise returns false. |
| 67 | static bool FillRegisters(Isolate* isolate, v8::RegisterState* state); |
| 68 | }; |
| 69 | #endif // USE_SIMULATOR |
| 70 | |
| 71 | } // namespace internal |
| 72 | } // namespace v8 |
| 73 | |
| 74 | #endif // V8_PROFILER_TICK_SAMPLE_H_ |