Reland "[profiler] Surface VM & Embedder State"

This is a reland of 2d087f237e

The changes are :
* Fix redundant reinterpret_cast in test file for MSVC failure
https://crbug.com/v8/12476
* Fix flaky test
https://crbug.com/v8/12475
If a sample is captured during a GC, no embedder context is obtained
defaulting to EMPTY. This is the expected behavior, made it in clear
in implementation and in test.
* Synchronized the embedder context filter behavior with existing
native context filter.

Original change's description:

> Add APIs to surface VMState and new EmbedderState to CpuProfile samples.
>
> EmbedderState:
> * An EmbedderState is defined as a value uint8_t and a v8::context used
> for filtering.
> * EmbedderStates are stack allocated by the embedder, construction and
> destruction set/unset the state to the isolate thread local top.
> * A v8::context is used to filter states that are added to a CpuProfile,
> if the CpuProfile do not have a ContextFilter set or if contexts do not
> match, state defaults to Empty.
>
> * v8:StateTag is already propagated all the way to a Sample, simply add
> an API to surface it.
>
> VMState:
> Change-Id: I7eed08907360b99b0ad20ddcff59c95c7076c85e
> Bug: chromium:1263871
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3188072
> Auto-Submit: Corentin Pescheloche <cpescheloche@fb.com>
> Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Commit-Queue: Camillo Bruni <cbruni@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#78250}

Bug: chromium:1263871
Change-Id: Ief891b05da99c695e9fb70f94ed7ebdecc6c3b7b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3320037
Auto-Submit: Corentin Pescheloche <cpescheloche@fb.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78281}

BUILD.bazel

@@ -445,6 +445,7 @@ filegroup(
         "include/v8-date.h",
         "include/v8-debug.h",
         "include/v8-embedder-heap.h",
+        "include/v8-embedder-state-scope.h,
         "include/v8-exception.h",
         "include/v8-extension.h",
         "include/v8-external.h",
@@ -1214,6 +1215,8 @@ filegroup(
         "src/execution/arguments.h",
         "src/execution/encoded-c-signature.cc",
         "src/execution/encoded-c-signature.h",
+        "src/execution/embedder-state.h",
+        "src/execution/embedder-state.cc",
         "src/execution/execution.cc",
         "src/execution/execution.h",
         "src/execution/frame-constants.h",

BUILD.gn

@@ -2487,6 +2487,7 @@ v8_header_set("v8_headers") {
     "include/v8-date.h",
     "include/v8-debug.h",
     "include/v8-embedder-heap.h",
+    "include/v8-embedder-state-scope.h",
     "include/v8-exception.h",
     "include/v8-extension.h",
     "include/v8-external.h",
@@ -2864,6 +2865,7 @@ v8_header_set("v8_internal_headers") {
     "src/diagnostics/unwinder.h",
     "src/execution/arguments-inl.h",
     "src/execution/arguments.h",
+    "src/execution/embedder-state.h",
     "src/execution/encoded-c-signature.h",
     "src/execution/execution.h",
     "src/execution/frame-constants.h",
@@ -4079,6 +4081,7 @@ v8_source_set("v8_base_without_compiler") {
     "src/diagnostics/perf-jit.cc",
     "src/diagnostics/unwinder.cc",
     "src/execution/arguments.cc",
+    "src/execution/embedder-state.cc",
     "src/execution/encoded-c-signature.cc",
     "src/execution/execution.cc",
     "src/execution/frames.cc",

include/v8-embedder-state-scope.h

@@ -0,0 +1,48 @@
+// Copyright 2021 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 INCLUDE_V8_EMBEDDER_STATE_SCOPE_H_
+#define INCLUDE_V8_EMBEDDER_STATE_SCOPE_H_
+
+#include <memory>
+
+#include "v8-context.h"       // NOLINT(build/include_directory)
+#include "v8-internal.h"      // NOLINT(build/include_directory)
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+
+namespace v8 {
+
+namespace internal {
+class EmbedderState;
+}  // namespace internal
+
+// A StateTag represents a possible state of the embedder.
+enum class EmbedderStateTag : uint8_t {
+  EMPTY = 0,
+  // embedder can define any state in between
+  OTHER = UINT8_MAX,
+};
+
+// A stack-allocated class that manages an embedder state on the isolate.
+// After an EmbedderState scope has been created, a new embedder state will be
+// pushed on the isolate stack.
+class V8_EXPORT EmbedderStateScope {
+ public:
+  EmbedderStateScope(Isolate* isolate, Local<v8::Context> context,
+                     EmbedderStateTag tag);
+
+ private:
+  // Declaring operator new and delete as deleted is not spec compliant.
+  // Therefore declare them private instead to disable dynamic alloc
+  void* operator new(size_t size);
+  void* operator new[](size_t size);
+  void operator delete(void*, size_t);
+  void operator delete[](void*, size_t);
+
+  std::unique_ptr<internal::EmbedderState> embedder_state_;
+};
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_EMBEDDER_STATE_SCOPE_H_

include/v8-profiler.h

@@ -20,9 +20,11 @@
  */
 namespace v8 {
 
+enum class EmbedderStateTag : uint8_t;
 class HeapGraphNode;
 struct HeapStatsUpdate;
 class Object;
+enum StateTag : int;
 
 using NativeObject = void*;
 using SnapshotObjectId = uint32_t;
@@ -210,6 +212,16 @@ class V8_EXPORT CpuProfile {
    */
   int64_t GetStartTime() const;
 
+  /**
+   * Returns state of the vm when sample was captured.
+   */
+  StateTag GetSampleState(int index) const;
+
+  /**
+   * Returns state of the embedder when sample was captured.
+   */
+  EmbedderStateTag GetSampleEmbedderState(int index) const;
+
   /**
    * Returns time when the profile recording was stopped (in microseconds)
    * since some unspecified starting point.

include/v8-unwinder.h

@@ -7,7 +7,8 @@
 
 #include <memory>
 
-#include "v8config.h"  // NOLINT(build/include_directory)
+#include "v8-embedder-state-scope.h"  // NOLINT(build/include_directory)
+#include "v8config.h"                 // NOLINT(build/include_directory)
 
 namespace v8 {
 // Holds the callee saved registers needed for the stack unwinder. It is the
@@ -32,7 +33,7 @@ struct V8_EXPORT RegisterState {
 };
 
 // A StateTag represents a possible state of the VM.
-enum StateTag {
+enum StateTag : int {
   JS,
   GC,
   PARSER,
@@ -46,11 +47,13 @@ enum StateTag {
 
 // The output structure filled up by GetStackSample API function.
 struct SampleInfo {
-  size_t frames_count;            // Number of frames collected.
-  StateTag vm_state;              // Current VM state.
-  void* external_callback_entry;  // External callback address if VM is
-                                  // executing an external callback.
-  void* context;                  // Incumbent native context address.
+  size_t frames_count;              // Number of frames collected.
+  void* external_callback_entry;    // External callback address if VM is
+                                    // executing an external callback.
+  void* context;                    // Incumbent native context address.
+  void* embedder_context;           // Native context address for embedder state
+  StateTag vm_state;                // Current VM state.
+  EmbedderStateTag embedder_state;  // Current Embedder state
 };
 
 struct MemoryRange {

src/api/api.cc

@@ -15,6 +15,7 @@
 #include "include/v8-callbacks.h"
 #include "include/v8-cppgc.h"
 #include "include/v8-date.h"
+#include "include/v8-embedder-state-scope.h"
 #include "include/v8-extension.h"
 #include "include/v8-fast-api-calls.h"
 #include "include/v8-function.h"
@@ -46,6 +47,7 @@
 #include "src/debug/liveedit.h"
 #include "src/deoptimizer/deoptimizer.h"
 #include "src/diagnostics/gdb-jit.h"
+#include "src/execution/embedder-state.h"
 #include "src/execution/execution.h"
 #include "src/execution/frames-inl.h"
 #include "src/execution/isolate-inl.h"
@@ -9864,6 +9866,16 @@ int64_t CpuProfile::GetSampleTimestamp(int index) const {
   return profile->sample(index).timestamp.since_origin().InMicroseconds();
 }
 
+StateTag CpuProfile::GetSampleState(int index) const {
+  const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
+  return profile->sample(index).state_tag;
+}
+
+EmbedderStateTag CpuProfile::GetSampleEmbedderState(int index) const {
+  const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
+  return profile->sample(index).embedder_state_tag;
+}
+
 int64_t CpuProfile::GetStartTime() const {
   const i::CpuProfile* profile = reinterpret_cast<const i::CpuProfile*>(this);
   return profile->start_time().since_origin().InMicroseconds();
@@ -10332,6 +10344,11 @@ void EmbedderHeapTracer::ResetHandleInNonTracingGC(
   UNREACHABLE();
 }
 
+EmbedderStateScope::EmbedderStateScope(Isolate* isolate,
+                                       Local<v8::Context> context,
+                                       EmbedderStateTag tag)
+    : embedder_state_(new internal::EmbedderState(isolate, context, tag)) {}
+
 void TracedReferenceBase::CheckValue() const {
 #ifdef V8_HOST_ARCH_64_BIT
   if (!val_) return;

src/execution/embedder-state.cc

@@ -0,0 +1,45 @@
+// Copyright 2021 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.
+
+#include "src/execution/embedder-state.h"
+
+#include "src/api/api-inl.h"
+#include "src/base/logging.h"
+
+namespace v8 {
+
+namespace internal {
+
+EmbedderState::EmbedderState(v8::Isolate* isolate, Local<v8::Context> context,
+                             EmbedderStateTag tag)
+    : isolate_(reinterpret_cast<i::Isolate*>(isolate)),
+      tag_(tag),
+      previous_embedder_state_(isolate_->current_embedder_state()) {
+  if (!context.IsEmpty()) {
+    native_context_address_ =
+        v8::Utils::OpenHandle(*context)->native_context().address();
+  }
+
+  DCHECK_NE(this, isolate_->current_embedder_state());
+  isolate_->set_current_embedder_state(this);
+}
+
+EmbedderState::~EmbedderState() {
+  DCHECK_EQ(this, isolate_->current_embedder_state());
+  isolate_->set_current_embedder_state(previous_embedder_state_);
+}
+
+void EmbedderState::OnMoveEvent(Address from, Address to) {
+  EmbedderState* state = this;
+  do {
+    if (state->native_context_address_ == from) {
+      native_context_address_ = to;
+    }
+    state = state->previous_embedder_state_;
+  } while (state != nullptr);
+}
+
+}  // namespace internal
+
+}  // namespace v8

src/execution/embedder-state.h

@@ -0,0 +1,39 @@
+// Copyright 2021 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_EXECUTION_EMBEDDER_STATE_H_
+#define V8_EXECUTION_EMBEDDER_STATE_H_
+
+#include "include/v8-local-handle.h"
+#include "src/execution/isolate.h"
+
+namespace v8 {
+
+enum class EmbedderStateTag : uint8_t;
+
+namespace internal {
+class V8_EXPORT_PRIVATE EmbedderState {
+ public:
+  EmbedderState(v8::Isolate* isolate, Local<v8::Context> context,
+                EmbedderStateTag tag);
+
+  ~EmbedderState();
+
+  EmbedderStateTag GetState() const { return tag_; }
+
+  Address native_context_address() const { return native_context_address_; }
+
+  void OnMoveEvent(Address from, Address to);
+
+ private:
+  Isolate* isolate_;
+  EmbedderStateTag tag_;
+  Address native_context_address_ = kNullAddress;
+  EmbedderState* previous_embedder_state_;
+};
+}  // namespace internal
+
+}  // namespace v8
+
+#endif  // V8_EXECUTION_EMBEDDER_STATE_H_

src/execution/isolate.h

@@ -65,6 +65,8 @@ class V8Inspector;
 
 namespace v8 {
 
+class EmbedderState;
+
 namespace base {
 class RandomNumberGenerator;
 }  // namespace base
@@ -1303,6 +1305,7 @@ class V8_EXPORT_PRIVATE Isolate final : private HiddenFactory {
   THREAD_LOCAL_TOP_ACCESSOR(ExternalCallbackScope*, external_callback_scope)
 
   THREAD_LOCAL_TOP_ACCESSOR(StateTag, current_vm_state)
+  THREAD_LOCAL_TOP_ACCESSOR(EmbedderState*, current_embedder_state)
 
   void SetData(uint32_t slot, void* data) {
     DCHECK_LT(slot, Internals::kNumIsolateDataSlots);

src/execution/thread-local-top.cc

@@ -31,6 +31,7 @@ void ThreadLocalTop::Clear() {
   js_entry_sp_ = kNullAddress;
   external_callback_scope_ = nullptr;
   current_vm_state_ = EXTERNAL;
+  current_embedder_state_ = nullptr;
   failed_access_check_callback_ = nullptr;
   thread_in_wasm_flag_address_ = kNullAddress;
 #ifdef V8_ENABLE_CONSERVATIVE_STACK_SCANNING

src/execution/thread-local-top.h

@@ -23,6 +23,7 @@ class TryCatch;
 
 namespace internal {
 
+class EmbedderState;
 class ExternalCallbackScope;
 class Isolate;
 class PromiseOnStack;
@@ -34,9 +35,9 @@ class ThreadLocalTop {
   // refactor this to really consist of just Addresses and 32-bit
   // integer fields.
 #ifdef V8_ENABLE_CONSERVATIVE_STACK_SCANNING
-  static constexpr uint32_t kSizeInBytes = 25 * kSystemPointerSize;
+  static constexpr uint32_t kSizeInBytes = 26 * kSystemPointerSize;
 #else
-  static constexpr uint32_t kSizeInBytes = 24 * kSystemPointerSize;
+  static constexpr uint32_t kSizeInBytes = 25 * kSystemPointerSize;
 #endif
 
   // Does early low-level initialization that does not depend on the
@@ -151,6 +152,7 @@ class ThreadLocalTop {
   // The external callback we're currently in.
   ExternalCallbackScope* external_callback_scope_;
   StateTag current_vm_state_;
+  EmbedderState* current_embedder_state_;
 
   // Call back function to report unsafe JS accesses.
   v8::FailedAccessCheckCallback failed_access_check_callback_;

src/heap/heap.cc

@@ -27,6 +27,7 @@
 #include "src/compiler-dispatcher/optimizing-compile-dispatcher.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer/deoptimizer.h"
+#include "src/execution/embedder-state.h"
 #include "src/execution/isolate-utils-inl.h"
 #include "src/execution/microtask-queue.h"
 #include "src/execution/runtime-profiler.h"
@@ -3323,6 +3324,10 @@ void Heap::OnMoveEvent(HeapObject target, HeapObject source,
     LOG_CODE_EVENT(isolate_, SharedFunctionInfoMoveEvent(source.address(),
                                                          target.address()));
   } else if (target.IsNativeContext()) {
+    if (isolate_->current_embedder_state() != nullptr) {
+      isolate_->current_embedder_state()->OnMoveEvent(source.address(),
+                                                      target.address());
+    }
     PROFILE(isolate_,
             NativeContextMoveEvent(source.address(), target.address()));
   }

src/profiler/cpu-profiler.cc

@@ -230,12 +230,15 @@ void ProfilerEventsProcessor::CodeEventHandler(
 
 void SamplingEventsProcessor::SymbolizeAndAddToProfiles(
     const TickSampleEventRecord* record) {
+  const TickSample& tick_sample = record->sample;
   Symbolizer::SymbolizedSample symbolized =
-      symbolizer_->SymbolizeTickSample(record->sample);
+      symbolizer_->SymbolizeTickSample(tick_sample);
   profiles_->AddPathToCurrentProfiles(
-      record->sample.timestamp, symbolized.stack_trace, symbolized.src_line,
-      record->sample.update_stats_, record->sample.sampling_interval_,
-      reinterpret_cast<Address>(record->sample.context));
+      tick_sample.timestamp, symbolized.stack_trace, symbolized.src_line,
+      tick_sample.update_stats_, tick_sample.sampling_interval_,
+      tick_sample.state, tick_sample.embedder_state,
+      reinterpret_cast<Address>(tick_sample.context),
+      reinterpret_cast<Address>(tick_sample.embedder_context));
 }
 
 ProfilerEventsProcessor::SampleProcessingResult

src/profiler/profile-generator.cc

@@ -620,7 +620,9 @@ bool CpuProfile::CheckSubsample(base::TimeDelta source_sampling_interval) {
 
 void CpuProfile::AddPath(base::TimeTicks timestamp,
                          const ProfileStackTrace& path, int src_line,
-                         bool update_stats, base::TimeDelta sampling_interval) {
+                         bool update_stats, base::TimeDelta sampling_interval,
+                         StateTag state_tag,
+                         EmbedderStateTag embedder_state_tag) {
   if (!CheckSubsample(sampling_interval)) return;
 
   ProfileNode* top_frame_node =
@@ -632,7 +634,8 @@ void CpuProfile::AddPath(base::TimeTicks timestamp,
        samples_.size() < options_.max_samples());
 
   if (should_record_sample) {
-    samples_.push_back({top_frame_node, timestamp, src_line});
+    samples_.push_back(
+        {top_frame_node, timestamp, src_line, state_tag, embedder_state_tag});
   }
 
   if (!should_record_sample && delegate_ != nullptr) {
@@ -988,19 +991,24 @@ base::TimeDelta CpuProfilesCollection::GetCommonSamplingInterval() const {
 
 void CpuProfilesCollection::AddPathToCurrentProfiles(
     base::TimeTicks timestamp, const ProfileStackTrace& path, int src_line,
-    bool update_stats, base::TimeDelta sampling_interval,
-    Address native_context_address) {
+    bool update_stats, base::TimeDelta sampling_interval, StateTag state,
+    EmbedderStateTag embedder_state_tag, Address native_context_address,
+    Address embedder_native_context_address) {
   // As starting / stopping profiles is rare relatively to this
   // method, we don't bother minimizing the duration of lock holding,
   // e.g. copying contents of the list to a local vector.
   current_profiles_semaphore_.Wait();
   const ProfileStackTrace empty_path;
   for (const std::unique_ptr<CpuProfile>& profile : current_profiles_) {
+    ContextFilter& context_filter = profile->context_filter();
     // If the context filter check failed, omit the contents of the stack.
-    bool accepts_context =
-        profile->context_filter().Accept(native_context_address);
+    bool accepts_context = context_filter.Accept(native_context_address);
+    bool accepts_embedder_context =
+        context_filter.Accept(embedder_native_context_address);
     profile->AddPath(timestamp, accepts_context ? path : empty_path, src_line,
-                     update_stats, sampling_interval);
+                     update_stats, sampling_interval, state,
+                     accepts_embedder_context ? embedder_state_tag
+                                              : EmbedderStateTag::EMPTY);
   }
   current_profiles_semaphore_.Signal();
 }

src/profiler/profile-generator.h

@@ -17,6 +17,7 @@
 #include "include/v8-profiler.h"
 #include "src/base/platform/time.h"
 #include "src/builtins/builtins.h"
+#include "src/execution/vm-state.h"
 #include "src/logging/code-events.h"
 #include "src/profiler/strings-storage.h"
 #include "src/utils/allocation.h"
@@ -405,6 +406,8 @@ class CpuProfile {
     ProfileNode* node;
     base::TimeTicks timestamp;
     int line;
+    StateTag state_tag;
+    EmbedderStateTag embedder_state_tag;
   };
 
   V8_EXPORT_PRIVATE CpuProfile(
@@ -419,7 +422,8 @@ class CpuProfile {
   // Add pc -> ... -> main() call path to the profile.
   void AddPath(base::TimeTicks timestamp, const ProfileStackTrace& path,
                int src_line, bool update_stats,
-               base::TimeDelta sampling_interval);
+               base::TimeDelta sampling_interval, StateTag state,
+               EmbedderStateTag embedder_state);
   void FinishProfile();
 
   const char* title() const { return title_; }
@@ -554,11 +558,12 @@ class V8_EXPORT_PRIVATE CpuProfilesCollection {
   base::TimeDelta GetCommonSamplingInterval() const;
 
   // Called from profile generator thread.
-  void AddPathToCurrentProfiles(base::TimeTicks timestamp,
-                                const ProfileStackTrace& path, int src_line,
-                                bool update_stats,
-                                base::TimeDelta sampling_interval,
-                                Address native_context_address = kNullAddress);
+  void AddPathToCurrentProfiles(
+      base::TimeTicks timestamp, const ProfileStackTrace& path, int src_line,
+      bool update_stats, base::TimeDelta sampling_interval, StateTag state,
+      EmbedderStateTag embedder_state_tag,
+      Address native_context_address = kNullAddress,
+      Address native_embedder_context_address = kNullAddress);
 
   // Called from profile generator thread.
   void UpdateNativeContextAddressForCurrentProfiles(Address from, Address to);

src/profiler/tick-sample.cc

@@ -9,6 +9,7 @@
 #include "include/v8-profiler.h"
 #include "src/base/sanitizer/asan.h"
 #include "src/base/sanitizer/msan.h"
+#include "src/execution/embedder-state.h"
 #include "src/execution/frames-inl.h"
 #include "src/execution/simulator.h"
 #include "src/execution/vm-state-inl.h"
@@ -178,6 +179,8 @@ DISABLE_ASAN void TickSample::Init(Isolate* v8_isolate,
   frames_count = static_cast<unsigned>(info.frames_count);
   has_external_callback = info.external_callback_entry != nullptr;
   context = info.context;
+  embedder_context = info.embedder_context;
+  embedder_state = info.embedder_state;
   if (has_external_callback) {
     external_callback_entry = info.external_callback_entry;
   } else if (frames_count) {
@@ -210,9 +213,19 @@ bool TickSample::GetStackSample(Isolate* v8_isolate, RegisterState* regs,
   sample_info->frames_count = 0;
   sample_info->vm_state = isolate->current_vm_state();
   sample_info->external_callback_entry = nullptr;
+  sample_info->embedder_state = EmbedderStateTag::EMPTY;
+  sample_info->embedder_context = nullptr;
   sample_info->context = nullptr;
+
   if (sample_info->vm_state == GC) return true;
 
+  EmbedderState* embedder_state = isolate->current_embedder_state();
+  if (embedder_state != nullptr) {
+    sample_info->embedder_context =
+        reinterpret_cast<void*>(embedder_state->native_context_address());
+    sample_info->embedder_state = embedder_state->GetState();
+  }
+
   i::Address js_entry_sp = isolate->js_entry_sp();
   if (js_entry_sp == 0) return true;  // Not executing JS now.
 

src/profiler/tick-sample.h

@@ -23,6 +23,7 @@ struct V8_EXPORT TickSample {
 
   TickSample()
       : state(OTHER),
+        embedder_state(EmbedderStateTag::EMPTY),
         pc(nullptr),
         external_callback_entry(nullptr),
         frames_count(0),
@@ -82,6 +83,7 @@ struct V8_EXPORT TickSample {
   void print() const;
 
   StateTag state;  // The state of the VM.
+  EmbedderStateTag embedder_state;
   void* pc;        // Instruction pointer.
   union {
     void* tos;  // Top stack value (*sp).
@@ -91,6 +93,7 @@ struct V8_EXPORT TickSample {
   static const unsigned kMaxFramesCount = (1 << kMaxFramesCountLog2) - 1;
   void* stack[kMaxFramesCount];     // Call stack.
   void* context = nullptr;          // Address of the incumbent native context.
+  void* embedder_context = nullptr;  // Address of the embedder native context.
   unsigned frames_count : kMaxFramesCountLog2;  // Number of captured frames.
   bool has_external_callback : 1;
   bool update_stats_ : 1;  // Whether the sample should update aggregated stats.

test/cctest/test-cpu-profiler.cc

@@ -41,6 +41,7 @@
 #include "src/codegen/compilation-cache.h"
 #include "src/codegen/source-position-table.h"
 #include "src/deoptimizer/deoptimizer.h"
+#include "src/execution/embedder-state.h"
 #include "src/heap/spaces.h"
 #include "src/init/v8.h"
 #include "src/libplatform/default-platform.h"
@@ -3922,6 +3923,217 @@ TEST(ContextIsolation) {
   }
 }
 
+void ValidateEmbedderState(v8::CpuProfile* profile,
+                           EmbedderStateTag expected_tag) {
+  for (int i = 0; i < profile->GetSamplesCount(); i++) {
+    if (profile->GetSampleState(i) == StateTag::GC) {
+      // Samples captured during a GC do not have an EmbedderState
+      CHECK_EQ(profile->GetSampleEmbedderState(i), EmbedderStateTag::EMPTY);
+    } else {
+      CHECK_EQ(profile->GetSampleEmbedderState(i), expected_tag);
+    }
+  }
+}
+
+// Tests that embedder states from other contexts aren't recorded
+TEST(EmbedderContextIsolation) {
+  i::FLAG_allow_natives_syntax = true;
+  LocalContext execution_env;
+  i::HandleScope scope(CcTest::i_isolate());
+
+  v8::Isolate* isolate = execution_env.local()->GetIsolate();
+
+  // Install CollectSample callback for more deterministic sampling.
+  v8::Local<v8::FunctionTemplate> func_template =
+      v8::FunctionTemplate::New(isolate, CallCollectSample);
+  v8::Local<v8::Function> func =
+      func_template->GetFunction(execution_env.local()).ToLocalChecked();
+  func->SetName(v8_str("CallCollectSample"));
+  execution_env->Global()
+      ->Set(execution_env.local(), v8_str("CallCollectSample"), func)
+      .FromJust();
+
+  v8::Local<v8::Context> diff_context = v8::Context::New(isolate);
+  {
+    CHECK_NULL(CcTest::i_isolate()->current_embedder_state());
+    // prepare other embedder state
+    EmbedderStateScope scope(isolate, diff_context, EmbedderStateTag::OTHER);
+    CHECK_EQ(CcTest::i_isolate()->current_embedder_state()->GetState(),
+             EmbedderStateTag::OTHER);
+
+    ProfilerHelper helper(execution_env.local());
+    CompileRun(R"(
+      function optimized() {
+        CallCollectSample();
+      }
+
+      function unoptimized() {
+        CallCollectSample();
+      }
+
+      function start() {
+        // Test optimized functions
+        %PrepareFunctionForOptimization(optimized);
+        optimized();
+        optimized();
+        %OptimizeFunctionOnNextCall(optimized);
+        optimized();
+
+        // Test unoptimized functions
+        %NeverOptimizeFunction(unoptimized);
+        unoptimized();
+
+        // Test callback
+        CallCollectSample();
+      }
+    )");
+    v8::Local<v8::Function> function =
+        GetFunction(execution_env.local(), "start");
+
+    v8::CpuProfile* profile = helper.Run(
+        function, nullptr, 0, 0, 0, v8::CpuProfilingMode::kLeafNodeLineNumbers,
+        v8::CpuProfilingOptions::kNoSampleLimit, execution_env.local());
+    ValidateEmbedderState(profile, EmbedderStateTag::EMPTY);
+  }
+  CHECK_NULL(CcTest::i_isolate()->current_embedder_state());
+}
+
+// Tests that embedder states from same context are recorded
+TEST(EmbedderStatePropagate) {
+  i::FLAG_allow_natives_syntax = true;
+  LocalContext execution_env;
+  i::HandleScope scope(CcTest::i_isolate());
+
+  v8::Isolate* isolate = execution_env.local()->GetIsolate();
+
+  // Install CollectSample callback for more deterministic sampling.
+  v8::Local<v8::FunctionTemplate> func_template =
+      v8::FunctionTemplate::New(isolate, CallCollectSample);
+  v8::Local<v8::Function> func =
+      func_template->GetFunction(execution_env.local()).ToLocalChecked();
+  func->SetName(v8_str("CallCollectSample"));
+  execution_env->Global()
+      ->Set(execution_env.local(), v8_str("CallCollectSample"), func)
+      .FromJust();
+
+  {
+    // prepare embedder state
+    EmbedderState embedderState(isolate, execution_env.local(),
+                                EmbedderStateTag::OTHER);
+    CHECK_EQ(CcTest::i_isolate()->current_embedder_state(), &embedderState);
+
+    ProfilerHelper helper(execution_env.local());
+    CompileRun(R"(
+      function optimized() {
+        CallCollectSample();
+      }
+
+      function unoptimized() {
+        CallCollectSample();
+      }
+
+      function start() {
+        // Test optimized functions
+        %PrepareFunctionForOptimization(optimized);
+        optimized();
+        optimized();
+        %OptimizeFunctionOnNextCall(optimized);
+        optimized();
+
+        // Test unoptimized functions
+        %NeverOptimizeFunction(unoptimized);
+        unoptimized();
+
+        // Test callback
+        CallCollectSample();
+      }
+    )");
+    v8::Local<v8::Function> function =
+        GetFunction(execution_env.local(), "start");
+
+    v8::CpuProfile* profile = helper.Run(
+        function, nullptr, 0, 0, 0, v8::CpuProfilingMode::kLeafNodeLineNumbers,
+        v8::CpuProfilingOptions::kNoSampleLimit, execution_env.local());
+    ValidateEmbedderState(profile, EmbedderStateTag::OTHER);
+  }
+  CHECK_NULL(CcTest::i_isolate()->current_embedder_state());
+}
+
+// Tests that embedder states from same context are recorded
+// even after native context move
+TEST(EmbedderStatePropagateNativeContextMove) {
+  // Reusing context addresses will cause this test to fail.
+  if (i::FLAG_gc_global || i::FLAG_stress_compaction ||
+      i::FLAG_stress_incremental_marking || i::FLAG_enable_third_party_heap) {
+    return;
+  }
+  i::FLAG_allow_natives_syntax = true;
+  i::FLAG_manual_evacuation_candidates_selection = true;
+  LocalContext execution_env;
+  i::HandleScope scope(CcTest::i_isolate());
+
+  v8::Isolate* isolate = execution_env.local()->GetIsolate();
+
+  // Install CollectSample callback for more deterministic sampling.
+  v8::Local<v8::FunctionTemplate> func_template =
+      v8::FunctionTemplate::New(isolate, CallCollectSample);
+  v8::Local<v8::Function> func =
+      func_template->GetFunction(execution_env.local()).ToLocalChecked();
+  func->SetName(v8_str("CallCollectSample"));
+  execution_env->Global()
+      ->Set(execution_env.local(), v8_str("CallCollectSample"), func)
+      .FromJust();
+
+  {
+    // prepare embedder state
+    EmbedderState embedderState(isolate, execution_env.local(),
+                                EmbedderStateTag::OTHER);
+    CHECK_EQ(CcTest::i_isolate()->current_embedder_state(), &embedderState);
+
+    i::Address initial_address =
+        CcTest::i_isolate()->current_embedder_state()->native_context_address();
+
+    // Install a function that triggers the native context to be moved.
+    v8::Local<v8::FunctionTemplate> move_func_template =
+        v8::FunctionTemplate::New(
+            execution_env.local()->GetIsolate(),
+            [](const v8::FunctionCallbackInfo<v8::Value>& info) {
+              i::Isolate* isolate =
+                  reinterpret_cast<i::Isolate*>(info.GetIsolate());
+              i::heap::ForceEvacuationCandidate(
+                  i::Page::FromHeapObject(isolate->raw_native_context()));
+              CcTest::CollectAllGarbage();
+            });
+    v8::Local<v8::Function> move_func =
+        move_func_template->GetFunction(execution_env.local()).ToLocalChecked();
+    move_func->SetName(v8_str("ForceNativeContextMove"));
+    execution_env->Global()
+        ->Set(execution_env.local(), v8_str("ForceNativeContextMove"),
+              move_func)
+        .FromJust();
+
+    ProfilerHelper helper(execution_env.local());
+    CompileRun(R"(
+      function start() {
+        ForceNativeContextMove();
+        CallCollectSample();
+      }
+    )");
+    v8::Local<v8::Function> function =
+        GetFunction(execution_env.local(), "start");
+
+    v8::CpuProfile* profile = helper.Run(
+        function, nullptr, 0, 0, 0, v8::CpuProfilingMode::kLeafNodeLineNumbers,
+        v8::CpuProfilingOptions::kNoSampleLimit, execution_env.local());
+    ValidateEmbedderState(profile, EmbedderStateTag::OTHER);
+
+    i::Address new_address =
+        CcTest::i_isolate()->current_embedder_state()->native_context_address();
+    CHECK_NE(initial_address, new_address);
+  }
+  CHECK_NULL(CcTest::i_isolate()->current_embedder_state());
+}
+
 // Tests that when a native context that's being filtered is moved, we continue
 // to track its execution.
 TEST(ContextFilterMovedNativeContext) {

test/cctest/test-profile-generator.cc

@@ -482,9 +482,9 @@ TEST(SampleIds) {
   sample1.stack[0] = ToPointer(0x1510);
   sample1.frames_count = 1;
   auto symbolized = symbolizer.SymbolizeTickSample(sample1);
-  profiles.AddPathToCurrentProfiles(sample1.timestamp, symbolized.stack_trace,
-                                    symbolized.src_line, true,
-                                    base::TimeDelta());
+  profiles.AddPathToCurrentProfiles(
+      sample1.timestamp, symbolized.stack_trace, symbolized.src_line, true,
+      base::TimeDelta(), StateTag::JS, EmbedderStateTag::EMPTY);
 
   TickSample sample2;
   sample2.timestamp = v8::base::TimeTicks::HighResolutionNow();
@@ -494,9 +494,9 @@ TEST(SampleIds) {
   sample2.stack[2] = ToPointer(0x1620);
   sample2.frames_count = 3;
   symbolized = symbolizer.SymbolizeTickSample(sample2);
-  profiles.AddPathToCurrentProfiles(sample2.timestamp, symbolized.stack_trace,
-                                    symbolized.src_line, true,
-                                    base::TimeDelta());
+  profiles.AddPathToCurrentProfiles(
+      sample2.timestamp, symbolized.stack_trace, symbolized.src_line, true,
+      base::TimeDelta(), StateTag::JS, EmbedderStateTag::EMPTY);
 
   TickSample sample3;
   sample3.timestamp = v8::base::TimeTicks::HighResolutionNow();
@@ -505,9 +505,9 @@ TEST(SampleIds) {
   sample3.stack[1] = ToPointer(0x1610);
   sample3.frames_count = 2;
   symbolized = symbolizer.SymbolizeTickSample(sample3);
-  profiles.AddPathToCurrentProfiles(sample3.timestamp, symbolized.stack_trace,
-                                    symbolized.src_line, true,
-                                    base::TimeDelta());
+  profiles.AddPathToCurrentProfiles(
+      sample3.timestamp, symbolized.stack_trace, symbolized.src_line, true,
+      base::TimeDelta(), StateTag::JS, EmbedderStateTag::EMPTY);
 
   CpuProfile* profile = profiles.StopProfiling("");
   unsigned nodeId = 1;
@@ -603,9 +603,9 @@ TEST(MaxSamplesCallback) {
   sample1.stack[0] = ToPointer(0x1510);
   sample1.frames_count = 1;
   auto symbolized = symbolizer.SymbolizeTickSample(sample1);
-  profiles.AddPathToCurrentProfiles(sample1.timestamp, symbolized.stack_trace,
-                                    symbolized.src_line, true,
-                                    base::TimeDelta());
+  profiles.AddPathToCurrentProfiles(
+      sample1.timestamp, symbolized.stack_trace, symbolized.src_line, true,
+      base::TimeDelta(), StateTag::JS, EmbedderStateTag::EMPTY);
   CHECK_EQ(0, mock_platform->posted_count());
   TickSample sample2;
   sample2.timestamp = v8::base::TimeTicks::HighResolutionNow();
@@ -613,18 +613,18 @@ TEST(MaxSamplesCallback) {
   sample2.stack[0] = ToPointer(0x1780);
   sample2.frames_count = 2;
   symbolized = symbolizer.SymbolizeTickSample(sample2);
-  profiles.AddPathToCurrentProfiles(sample2.timestamp, symbolized.stack_trace,
-                                    symbolized.src_line, true,
-                                    base::TimeDelta());
+  profiles.AddPathToCurrentProfiles(
+      sample2.timestamp, symbolized.stack_trace, symbolized.src_line, true,
+      base::TimeDelta(), StateTag::JS, EmbedderStateTag::EMPTY);
   CHECK_EQ(1, mock_platform->posted_count());
   TickSample sample3;
   sample3.timestamp = v8::base::TimeTicks::HighResolutionNow();
   sample3.pc = ToPointer(0x1510);
   sample3.frames_count = 3;
   symbolized = symbolizer.SymbolizeTickSample(sample3);
-  profiles.AddPathToCurrentProfiles(sample3.timestamp, symbolized.stack_trace,
-                                    symbolized.src_line, true,
-                                    base::TimeDelta());
+  profiles.AddPathToCurrentProfiles(
+      sample3.timestamp, symbolized.stack_trace, symbolized.src_line, true,
+      base::TimeDelta(), StateTag::JS, EmbedderStateTag::EMPTY);
   CHECK_EQ(1, mock_platform->posted_count());
 
   // Teardown
@@ -654,7 +654,8 @@ TEST(NoSamples) {
   auto symbolized = symbolizer.SymbolizeTickSample(sample1);
   profiles.AddPathToCurrentProfiles(v8::base::TimeTicks::HighResolutionNow(),
                                     symbolized.stack_trace, symbolized.src_line,
-                                    true, base::TimeDelta());
+                                    true, base::TimeDelta(), StateTag::JS,
+                                    EmbedderStateTag::EMPTY);
 
   CpuProfile* profile = profiles.StopProfiling("");
   unsigned nodeId = 1;