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Unified Diff: src/profiler/sampling-heap-profiler.h

Issue 1555553002: [profiler] Implement POC Sampling Heap Profiler (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: remove unused variable Created 4 years, 11 months ago
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Index: src/profiler/sampling-heap-profiler.h
diff --git a/src/profiler/sampling-heap-profiler.h b/src/profiler/sampling-heap-profiler.h
new file mode 100644
index 0000000000000000000000000000000000000000..d9b88e9b861bdaa2d135f53b056f301a6f543096
--- /dev/null
+++ b/src/profiler/sampling-heap-profiler.h
@@ -0,0 +1,135 @@
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_PROFILER_SAMPLING_HEAP_PROFILER_H_
+#define V8_PROFILER_SAMPLING_HEAP_PROFILER_H_
+
+#include <deque>
+#include <map>
+#include <set>
+#include "include/v8-profiler.h"
+#include "src/heap/heap.h"
+#include "src/profiler/strings-storage.h"
+
+namespace v8 {
+
+namespace base {
+class RandomNumberGenerator;
+}
+
+namespace internal {
+
+
+class AllocationProfile : public v8::AllocationProfile {
+ public:
+ AllocationProfile() : nodes_() {}
+
+ Node* GetRootNode() override {
+ return nodes_.size() == 0 ? nullptr : &nodes_.front();
+ }
+
+ std::deque<Node>& nodes() { return nodes_; }
+
+ private:
+ std::deque<Node> nodes_;
+
+ DISALLOW_COPY_AND_ASSIGN(AllocationProfile);
+};
+
+class SamplingHeapProfiler : public InlineAllocationObserver {
+ public:
+ SamplingHeapProfiler(Heap* heap, StringsStorage* names, uint64_t rate,
+ int stack_depth);
+ ~SamplingHeapProfiler();
+
+ v8::AllocationProfile* GetAllocationProfile();
+
+ void Step(int bytes_allocated, Address soon_object, size_t size) override;
+ intptr_t GetNextStepSize() override {
+ return GetNextSampleInterval(random_, rate_);
+ }
+
+ StringsStorage* names() const { return names_; }
+
+ class FunctionInfo {
+ public:
+ FunctionInfo(SharedFunctionInfo* shared, StringsStorage* names);
+ explicit FunctionInfo(const char* name)
+ : name_(name),
+ script_name_(""),
+ script_id_(v8::UnboundScript::kNoScriptId),
+ start_position_(0) {}
+
+ const char* get_name() const { return name_; }
+ const char* get_script_name() const { return script_name_; }
+ int get_script_id() const { return script_id_; }
+ int get_start_position() const { return start_position_; }
+
+ private:
+ const char* const name_;
+ const char* script_name_;
+ int script_id_;
+ const int start_position_;
+ };
+
+ class SampledAllocation {
+ public:
+ SampledAllocation(SamplingHeapProfiler* sampling_heap_profiler,
+ Isolate* isolate, Local<Value> local, size_t size,
+ int max_frames);
+ ~SampledAllocation() {
+ for (auto info : stack_) {
+ delete info;
+ }
+ global_.Reset(); // drop the reference.
+ }
+ size_t get_size() const { return size_; }
+ const std::vector<FunctionInfo*>& get_stack() const { return stack_; }
+
+ private:
+ static void OnWeakCallback(const WeakCallbackInfo<SampledAllocation>& data);
+
+ SamplingHeapProfiler* const sampling_heap_profiler_;
+ Global<Value> global_;
+ std::vector<FunctionInfo*> stack_;
+ const size_t size_;
+
+ DISALLOW_COPY_AND_ASSIGN(SampledAllocation);
+ };
+
+ private:
+ using Node = v8::AllocationProfile::Node;
+
+ Heap* heap() const { return heap_; }
+
+ void SampleObject(Address soon_object, size_t size);
+
+ static intptr_t GetNextSampleInterval(base::RandomNumberGenerator* random,
+ uint64_t rate);
+
+ // Methods that construct v8::AllocationProfile.
+ Node* AddStack(AllocationProfile* profile,
+ const std::map<int, Script*>& scripts,
+ const std::vector<FunctionInfo*>& stack);
+ Node* FindOrAddChildNode(AllocationProfile* profile,
+ const std::map<int, Script*>& scripts, Node* parent,
+ FunctionInfo* function_info);
+ Node* AllocateNode(AllocationProfile* profile,
+ const std::map<int, Script*>& scripts,
+ FunctionInfo* function_info);
+
+ Isolate* const isolate_;
+ Heap* const heap_;
+ base::RandomNumberGenerator* const random_;
+ StringsStorage* const names_;
+ std::set<SampledAllocation*> samples_;
+ const uint64_t rate_;
+ const int stack_depth_;
+};
+
+
+} // namespace internal
+} // namespace v8
+
+#endif // V8_PROFILER_SAMPLING_HEAP_PROFILER_H_
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