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), 39 update_stats(true) {} 40 void Init(Isolate* isolate, const v8::RegisterState& state, 41 RecordCEntryFrame record_c_entry_frame, bool update_stats); 42 static bool GetStackSample(Isolate* isolate, const v8::RegisterState& state, 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. 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_ 75
