c0fca4e8c8
R=jkummerow BUG=v8:2642 Review URL: https://codereview.chromium.org/14367020 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14348 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
126 lines
4.3 KiB
C++
126 lines
4.3 KiB
C++
// Copyright 2013 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_SAMPLER_H_
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#define V8_SAMPLER_H_
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#include "atomicops.h"
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#include "v8globals.h"
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namespace v8 {
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namespace internal {
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class Isolate;
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// ----------------------------------------------------------------------------
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// Sampler
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//
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// A sampler periodically samples the state of the VM and optionally
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// (if used for profiling) the program counter and stack pointer for
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// the thread that created it.
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// TickSample captures the information collected for each sample.
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struct TickSample {
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TickSample()
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: state(OTHER),
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pc(NULL),
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sp(NULL),
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fp(NULL),
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external_callback(NULL),
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frames_count(0),
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has_external_callback(false) {}
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void Trace(Isolate* isolate);
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StateTag state; // The state of the VM.
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Address pc; // Instruction pointer.
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Address sp; // Stack pointer.
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Address fp; // Frame pointer.
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union {
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Address tos; // Top stack value (*sp).
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Address external_callback;
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};
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static const int kMaxFramesCount = 64;
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Address stack[kMaxFramesCount]; // Call stack.
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int frames_count : 8; // Number of captured frames.
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bool has_external_callback : 1;
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};
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class Sampler {
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public:
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// Initializes the Sampler support. Called once at VM startup.
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static void SetUp();
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static void TearDown();
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// Initialize sampler.
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Sampler(Isolate* isolate, int interval);
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virtual ~Sampler();
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Isolate* isolate() const { return isolate_; }
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int interval() const { return interval_; }
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// Performs stack sampling.
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void SampleStack(TickSample* sample);
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// This method is called for each sampling period with the current
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// program counter.
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virtual void Tick(TickSample* sample) = 0;
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// Start and stop sampler.
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void Start();
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void Stop();
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// Is the sampler used for profiling?
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bool IsProfiling() const { return NoBarrier_Load(&profiling_) > 0; }
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void IncreaseProfilingDepth() { NoBarrier_AtomicIncrement(&profiling_, 1); }
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void DecreaseProfilingDepth() { NoBarrier_AtomicIncrement(&profiling_, -1); }
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// Whether the sampler is running (that is, consumes resources).
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bool IsActive() const { return NoBarrier_Load(&active_); }
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// Used in tests to make sure that stack sampling is performed.
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int samples_taken() const { return samples_taken_; }
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void ResetSamplesTaken() { samples_taken_ = 0; }
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class PlatformData;
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PlatformData* platform_data() const { return data_; }
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private:
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void SetActive(bool value) { NoBarrier_Store(&active_, value); }
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Isolate* isolate_;
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const int interval_;
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Atomic32 profiling_;
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Atomic32 active_;
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PlatformData* data_; // Platform specific data.
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int samples_taken_; // Counts stack samples taken.
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DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
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};
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} } // namespace v8::internal
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#endif // V8_SAMPLER_H_
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