Index: base/profiler/native_stack_sampler.h |
diff --git a/base/profiler/native_stack_sampler.h b/base/profiler/native_stack_sampler.h |
index 8d7e441b69306b072ed67321a531ac76aee4e28c..ebd7c3c4b816ad1416eb2867f71dc05f43b8f986 100644 |
--- a/base/profiler/native_stack_sampler.h |
+++ b/base/profiler/native_stack_sampler.h |
@@ -21,6 +21,26 @@ class NativeStackSamplerTestDelegate; |
// given thread. |
class NativeStackSampler { |
public: |
+ // This class contains a buffer for stack copies that can be shared across |
+ // multiple instances of NativeStackSampler. |
+ class StackBuffer { |
+ public: |
+ StackBuffer(size_t buffer_size); |
+ ~StackBuffer(); |
+ |
+ void* buffer() const { return buffer_.get(); } |
+ size_t size() const { return size_; } |
+ |
+ private: |
+ // The word-aligned buffer. |
+ const std::unique_ptr<uintptr_t[]> buffer_; |
+ |
+ // The size of the buffer. |
+ const size_t size_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(StackBuffer); |
+ }; |
+ |
// The callback type used to add annotations to a sample during collection. |
// This is passed to the native sampler to be applied at the most appropriate |
// time. It is a simple function-pointer because the generated code must be |
@@ -39,6 +59,13 @@ class NativeStackSampler { |
AnnotateCallback annotator, |
NativeStackSamplerTestDelegate* test_delegate); |
+ // Gets the required size of the stack buffer. |
+ static size_t GetStackBufferSize(); |
+ |
+ // Creates an instance of the a stack buffer that can be used for calls to |
+ // any NativeStackSampler object. |
+ static std::unique_ptr<StackBuffer> CreateStackBuffer(); |
+ |
// The following functions are all called on the SamplingThread (not the |
// thread being sampled). |
@@ -48,11 +75,12 @@ class NativeStackSampler { |
std::vector<StackSamplingProfiler::Module>* modules) = 0; |
// Records a stack sample to |sample|. |
- virtual void RecordStackSample(StackSamplingProfiler::Sample* sample) = 0; |
+ virtual void RecordStackSample(StackBuffer* stackbuffer, |
+ StackSamplingProfiler::Sample* sample) = 0; |
// Notifies the sampler that we've stopped recording the current |
// profile. |
- virtual void ProfileRecordingStopped() = 0; |
+ virtual void ProfileRecordingStopped(StackBuffer* stackbuffer) = 0; |
protected: |
NativeStackSampler(); |