deps,src: patch V8 to be API/ABI compatible with 7.4 (from 7.8)

deps: revert 2ac8bb719 from upstream V8

Original commit message:

    profiler: Allow querying SnapshotObjectId for native objects

    - Adds regular native heap entries to the HeapObjectsMap.
    - Adds a side map for keeping a mapping of native objects to their canonical
      heap entry that they have been merged into.

    Change-Id: Ida00628126ded1948ceb2a0cbe14da817af7f361
    Bug: chromium:988350
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1720810
    Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
    Reviewed-by: Alexei Filippov <alph@chromium.org>
    Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#63140}

Refs: v8/v8@2ac8bb7

[The `SuppressMicrotaskExecutionScope` hack only works because
the constructor that allows specifying an alternative microtask
queue was never actually implemented.]

deps: revert fb698cec37 from upstream V8

Original commit message:

    [isolate-data] Move hot fields closer to isolate_root

    In generated code, we access fields inside IsolateData through the
    root-register. On some platforms it is significantly cheaper to access
    things that are close to the root-register value than things that are
    located far away. The motivation for this CL was a 5% difference in
    Octane/Mandreel scores between

    // Part of the stack check.
    cmpq rsp,[r13+0x9ea8]

    and

    cmpq rsp,[r13-0x30]  // Mandreel score improved by 5%.

    This moves the StackGuard up to fix Mandreel. As a drive-by, also move
    two more fields up that are accessed by each CallCFunction.

    Tbr: yangguo@chromium.org
    Bug: v8:9534,chromium:993264
    Change-Id: I5418b63d40274a138e285fa3c99b96e33a814fb1
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1751345
    Reviewed-by: Jakob Gruber <jgruber@chromium.org>
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Auto-Submit: Jakob Gruber <jgruber@chromium.org>
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#63187}

Refs: v8/v8@fb698ce

src: re-add flags removed in V8 7.8 as no-ops

PR-URL: #30109
Reviewed-By: Myles Borins <myles.borins@gmail.com>

common.gypi

@@ -38,7 +38,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.20',
+    'v8_embedder_string': '-node.21',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/include/v8-internal.h

@@ -152,22 +152,15 @@ class Internals {
 
   static const uint32_t kNumIsolateDataSlots = 4;
 
-  // IsolateData layout guarantees.
   static const int kIsolateEmbedderDataOffset = 0;
   static const int kExternalMemoryOffset =
       kNumIsolateDataSlots * kApiSystemPointerSize;
   static const int kExternalMemoryLimitOffset =
       kExternalMemoryOffset + kApiInt64Size;
   static const int kExternalMemoryAtLastMarkCompactOffset =
       kExternalMemoryLimitOffset + kApiInt64Size;
-  static const int kIsolateFastCCallCallerFpOffset =
-      kExternalMemoryAtLastMarkCompactOffset + kApiInt64Size;
-  static const int kIsolateFastCCallCallerPcOffset =
-      kIsolateFastCCallCallerFpOffset + kApiSystemPointerSize;
-  static const int kIsolateStackGuardOffset =
-      kIsolateFastCCallCallerPcOffset + kApiSystemPointerSize;
   static const int kIsolateRootsOffset =
-      kIsolateStackGuardOffset + 7 * kApiSystemPointerSize;
+      kExternalMemoryAtLastMarkCompactOffset + kApiInt64Size;
 
   static const int kUndefinedValueRootIndex = 4;
   static const int kTheHoleValueRootIndex = 5;
@@ -186,7 +179,7 @@ class Internals {
 
   static const int kFirstNonstringType = 0x40;
   static const int kOddballType = 0x43;
-  static const int kForeignType = 0x46;
+  static const int kForeignType = 0x47;
   static const int kJSSpecialApiObjectType = 0x410;
   static const int kJSApiObjectType = 0x420;
   static const int kJSObjectType = 0x421;

deps/v8/include/v8-platform.h

@@ -439,6 +439,14 @@ class Platform {
    */
   virtual void DumpWithoutCrashing() {}
 
+  /**
+   * Lets the embedder to add crash keys.
+   */
+  virtual void AddCrashKey(int id, const char* name, uintptr_t value) {
+    // "noop" is a valid implementation if the embedder doesn't care to log
+    // additional data for crashes.
+  }
+
  protected:
   /**
    * Default implementation of current wall-clock time in milliseconds

deps/v8/include/v8-profiler.h

@@ -18,8 +18,8 @@ namespace v8 {
 class HeapGraphNode;
 struct HeapStatsUpdate;
 
-using NativeObject = void*;
-using SnapshotObjectId = uint32_t;
+typedef uint32_t SnapshotObjectId;
+
 
 struct CpuProfileDeoptFrame {
   int script_id;
@@ -272,10 +272,12 @@ class V8_EXPORT CpuProfilingOptions {
    *                             zero, the sampling interval will be equal to
    *                             the profiler's sampling interval.
    */
-  CpuProfilingOptions(
-      CpuProfilingMode mode = kLeafNodeLineNumbers,
-      unsigned max_samples = kNoSampleLimit, int sampling_interval_us = 0,
-      MaybeLocal<Context> filter_context = MaybeLocal<Context>());
+  CpuProfilingOptions(CpuProfilingMode mode = kLeafNodeLineNumbers,
+                      unsigned max_samples = kNoSampleLimit,
+                      int sampling_interval_us = 0)
+      : mode_(mode),
+        max_samples_(max_samples),
+        sampling_interval_us_(sampling_interval_us) {}
 
   CpuProfilingMode mode() const { return mode_; }
   unsigned max_samples() const { return max_samples_; }
@@ -284,13 +286,12 @@ class V8_EXPORT CpuProfilingOptions {
  private:
   friend class internal::CpuProfile;
 
-  bool has_filter_context() const { return !filter_context_.IsEmpty(); }
+  bool has_filter_context() const;
   void* raw_filter_context() const;
 
   CpuProfilingMode mode_;
   unsigned max_samples_;
   int sampling_interval_us_;
-  CopyablePersistentTraits<Context>::CopyablePersistent filter_context_;
 };
 
 /**
@@ -752,12 +753,6 @@ class V8_EXPORT EmbedderGraph {
      */
     virtual const char* NamePrefix() { return nullptr; }
 
-    /**
-     * Returns the NativeObject that can be used for querying the
-     * |HeapSnapshot|.
-     */
-    virtual NativeObject GetNativeObject() { return nullptr; }
-
     Node(const Node&) = delete;
     Node& operator=(const Node&) = delete;
   };
@@ -820,12 +815,6 @@ class V8_EXPORT HeapProfiler {
    */
   SnapshotObjectId GetObjectId(Local<Value> value);
 
-  /**
-   * Returns SnapshotObjectId for a native object referenced by |value| if it
-   * has been seen by the heap profiler, kUnknownObjectId otherwise.
-   */
-  SnapshotObjectId GetObjectId(NativeObject value);
-
   /**
    * Returns heap object with given SnapshotObjectId if the object is alive,
    * otherwise empty handle is returned.

deps/v8/include/v8.h

@@ -2094,7 +2094,6 @@ struct SampleInfo {
   StateTag vm_state;              // Current VM state.
   void* external_callback_entry;  // External callback address if VM is
                                   // executing an external callback.
-  void* top_context;              // Incumbent native context address.
 };
 
 struct MemoryRange {
@@ -7561,9 +7560,8 @@ class V8_EXPORT EmbedderHeapTracer {
    * overriden to fill a |TraceSummary| that is used by V8 to schedule future
    * garbage collections.
    */
-  V8_DEPRECATE_SOON("Use version with parameter.",
-                    virtual void TraceEpilogue()) {}
-  virtual void TraceEpilogue(TraceSummary* trace_summary);
+  virtual void TraceEpilogue() {}
+  virtual void TraceEpilogue(TraceSummary* trace_summary) { TraceEpilogue(); }
 
   /**
    * Called upon entering the final marking pause. No more incremental marking
@@ -7835,7 +7833,6 @@ class V8_EXPORT Isolate {
   class V8_EXPORT SuppressMicrotaskExecutionScope {
    public:
     explicit SuppressMicrotaskExecutionScope(Isolate* isolate);
-    explicit SuppressMicrotaskExecutionScope(MicrotaskQueue* microtask_queue);
     ~SuppressMicrotaskExecutionScope();
 
     // Prevent copying of Scope objects.
@@ -7846,8 +7843,13 @@ class V8_EXPORT Isolate {
 
    private:
     internal::Isolate* const isolate_;
-    internal::MicrotaskQueue* const microtask_queue_;
     internal::Address previous_stack_height_;
+    static_assert(sizeof(internal::Address) ==
+                      sizeof(internal::MicrotaskQueue*) &&
+                  alignof(internal::Address) ==
+                      alignof(internal::MicrotaskQueue*),
+                  "The previous_stack_height_ field can replace the "
+                  "microtask_queue_ field ABI-wise");
 
     friend class internal::ThreadLocalTop;
   };

deps/v8/src/api/api.cc

@@ -8183,14 +8183,13 @@ Isolate::AllowJavascriptExecutionScope::~AllowJavascriptExecutionScope() {
 
 Isolate::SuppressMicrotaskExecutionScope::SuppressMicrotaskExecutionScope(
     Isolate* isolate)
-    : isolate_(reinterpret_cast<i::Isolate*>(isolate)),
-      microtask_queue_(isolate_->default_microtask_queue()) {
+    : isolate_(reinterpret_cast<i::Isolate*>(isolate)) {
   isolate_->thread_local_top()->IncrementCallDepth(this);
-  microtask_queue_->IncrementMicrotasksSuppressions();
+  isolate_->default_microtask_queue()->IncrementMicrotasksSuppressions();
 }
 
 Isolate::SuppressMicrotaskExecutionScope::~SuppressMicrotaskExecutionScope() {
-  microtask_queue_->DecrementMicrotasksSuppressions();
+  isolate_->default_microtask_queue()->DecrementMicrotasksSuppressions();
   isolate_->thread_local_top()->DecrementCallDepth(this);
 }
 
@@ -9975,25 +9974,12 @@ CpuProfiler* CpuProfiler::New(Isolate* isolate, CpuProfilingNamingMode mode) {
   return New(isolate, mode, kLazyLogging);
 }
 
-CpuProfilingOptions::CpuProfilingOptions(CpuProfilingMode mode,
-                                         unsigned max_samples,
-                                         int sampling_interval_us,
-                                         MaybeLocal<Context> filter_context)
-    : mode_(mode),
-      max_samples_(max_samples),
-      sampling_interval_us_(sampling_interval_us) {
-  if (!filter_context.IsEmpty()) {
-    Local<Context> local_filter_context = filter_context.ToLocalChecked();
-    filter_context_.Reset(local_filter_context->GetIsolate(),
-                          local_filter_context);
-  }
+bool CpuProfilingOptions::has_filter_context() const {
+  return false;
 }
 
 void* CpuProfilingOptions::raw_filter_context() const {
-  return reinterpret_cast<void*>(
-      i::Context::cast(*Utils::OpenPersistent(filter_context_))
-          .native_context()
-          .address());
+  return nullptr;
 }
 
 void CpuProfiler::Dispose() { delete reinterpret_cast<i::CpuProfiler*>(this); }
@@ -10265,10 +10251,6 @@ SnapshotObjectId HeapProfiler::GetObjectId(Local<Value> value) {
   return reinterpret_cast<i::HeapProfiler*>(this)->GetSnapshotObjectId(obj);
 }
 
-SnapshotObjectId HeapProfiler::GetObjectId(NativeObject value) {
-  return reinterpret_cast<i::HeapProfiler*>(this)->GetSnapshotObjectId(value);
-}
-
 Local<Value> HeapProfiler::FindObjectById(SnapshotObjectId id) {
   i::Handle<i::Object> obj =
       reinterpret_cast<i::HeapProfiler*>(this)->FindHeapObjectById(id);
@@ -10401,17 +10383,6 @@ void EmbedderHeapTracer::TracePrologue(TraceFlags flags) {
 #endif
 }
 
-void EmbedderHeapTracer::TraceEpilogue(TraceSummary* trace_summary) {
-#if __clang__
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wdeprecated"
-#endif
-  TraceEpilogue();
-#if __clang__
-#pragma clang diagnostic pop
-#endif
-}
-
 void EmbedderHeapTracer::FinalizeTracing() {
   if (isolate_) {
     i::Isolate* isolate = reinterpret_cast<i::Isolate*>(isolate_);

deps/v8/src/execution/isolate-data.h

@@ -111,27 +111,21 @@ class IsolateData final {
   Address* builtins() { return builtins_; }
 
  private:
-  // Static layout definition.
-  //
-  // Note: The location of fields within IsolateData is significant. The
-  // closer they are to the value of kRootRegister (i.e.: isolate_root()), the
-  // cheaper it is to access them. See also: https://crbug.com/993264.
-  // The recommend guideline is to put frequently-accessed fields close to the
-  // beginning of IsolateData.
+// Static layout definition.
 #define FIELDS(V)                                                             \
   V(kEmbedderDataOffset, Internals::kNumIsolateDataSlots* kSystemPointerSize) \
   V(kExternalMemoryOffset, kInt64Size)                                        \
   V(kExternalMemoryLlimitOffset, kInt64Size)                                  \
   V(kExternalMemoryAtLastMarkCompactOffset, kInt64Size)                       \
-  V(kFastCCallCallerFPOffset, kSystemPointerSize)                             \
-  V(kFastCCallCallerPCOffset, kSystemPointerSize)                             \
-  V(kStackGuardOffset, StackGuard::kSizeInBytes)                              \
   V(kRootsTableOffset, RootsTable::kEntriesCount* kSystemPointerSize)         \
   V(kExternalReferenceTableOffset, ExternalReferenceTable::kSizeInBytes)      \
   V(kThreadLocalTopOffset, ThreadLocalTop::kSizeInBytes)                      \
   V(kBuiltinEntryTableOffset, Builtins::builtin_count* kSystemPointerSize)    \
   V(kBuiltinsTableOffset, Builtins::builtin_count* kSystemPointerSize)        \
   V(kVirtualCallTargetRegisterOffset, kSystemPointerSize)                     \
+  V(kFastCCallCallerFPOffset, kSystemPointerSize)                             \
+  V(kFastCCallCallerPCOffset, kSystemPointerSize)                             \
+  V(kStackGuardOffset, StackGuard::kSizeInBytes)                              \
   V(kStackIsIterableOffset, kUInt8Size)                                       \
   /* This padding aligns IsolateData size by 8 bytes. */                      \
   V(kPaddingOffset,                                                           \
@@ -159,17 +153,6 @@ class IsolateData final {
   // Caches the amount of external memory registered at the last MC.
   int64_t external_memory_at_last_mark_compact_ = 0;
 
-  // Stores the state of the caller for TurboAssembler::CallCFunction so that
-  // the sampling CPU profiler can iterate the stack during such calls. These
-  // are stored on IsolateData so that they can be stored to with only one move
-  // instruction in compiled code.
-  Address fast_c_call_caller_fp_ = kNullAddress;
-  Address fast_c_call_caller_pc_ = kNullAddress;
-
-  // Fields related to the system and JS stack. In particular, this contains the
-  // stack limit used by stack checks in generated code.
-  StackGuard stack_guard_;
-
   RootsTable roots_;
 
   ExternalReferenceTable external_reference_table_;
@@ -189,6 +172,17 @@ class IsolateData final {
   // ia32 (otherwise the arguments adaptor call runs out of registers).
   void* virtual_call_target_register_ = nullptr;
 
+  // Stores the state of the caller for TurboAssembler::CallCFunction so that
+  // the sampling CPU profiler can iterate the stack during such calls. These
+  // are stored on IsolateData so that they can be stored to with only one move
+  // instruction in compiled code.
+  Address fast_c_call_caller_fp_ = kNullAddress;
+  Address fast_c_call_caller_pc_ = kNullAddress;
+
+  // Fields related to the system and JS stack. In particular, this contains the
+  // stack limit used by stack checks in generated code.
+  StackGuard stack_guard_;
+
   // Whether the SafeStackFrameIterator can successfully iterate the current
   // stack. Only valid values are 0 or 1.
   uint8_t stack_is_iterable_ = 1;

deps/v8/src/execution/isolate.cc

@@ -2924,14 +2924,6 @@ void Isolate::CheckIsolateLayout() {
   CHECK_EQ(OFFSET_OF(Isolate, isolate_data_), 0);
   CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, isolate_data_.embedder_data_)),
            Internals::kIsolateEmbedderDataOffset);
-  CHECK_EQ(static_cast<int>(
-               OFFSET_OF(Isolate, isolate_data_.fast_c_call_caller_fp_)),
-           Internals::kIsolateFastCCallCallerFpOffset);
-  CHECK_EQ(static_cast<int>(
-               OFFSET_OF(Isolate, isolate_data_.fast_c_call_caller_pc_)),
-           Internals::kIsolateFastCCallCallerPcOffset);
-  CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, isolate_data_.stack_guard_)),
-           Internals::kIsolateStackGuardOffset);
   CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, isolate_data_.roots_)),
            Internals::kIsolateRootsOffset);
   CHECK_EQ(Internals::kExternalMemoryOffset % 8, 0);

deps/v8/src/objects/instance-type.h

@@ -133,8 +133,8 @@ enum InstanceType : uint16_t {
 
   // "Data", objects that cannot contain non-map-word pointers to heap
   // objects.
-  FOREIGN_TYPE,
   BYTE_ARRAY_TYPE,
+  FOREIGN_TYPE,
   BYTECODE_ARRAY_TYPE,
   FREE_SPACE_TYPE,
   FIXED_DOUBLE_ARRAY_TYPE,

deps/v8/src/objects/objects-definitions.h

@@ -67,8 +67,8 @@ namespace internal {
                                                          \
   V(MAP_TYPE)                                            \
   V(CODE_TYPE)                                           \
-  V(FOREIGN_TYPE)                                        \
   V(BYTE_ARRAY_TYPE)                                     \
+  V(FOREIGN_TYPE)                                        \
   V(BYTECODE_ARRAY_TYPE)                                 \
   V(FREE_SPACE_TYPE)                                     \
                                                          \

deps/v8/src/profiler/heap-profiler.cc

@@ -151,17 +151,6 @@ SnapshotObjectId HeapProfiler::GetSnapshotObjectId(Handle<Object> obj) {
   return ids_->FindEntry(HeapObject::cast(*obj).address());
 }
 
-SnapshotObjectId HeapProfiler::GetSnapshotObjectId(NativeObject obj) {
-  // Try to find id of regular native node first.
-  SnapshotObjectId id = ids_->FindEntry(reinterpret_cast<Address>(obj));
-  // In case no id has been found, check whether there exists an entry where the
-  // native objects has been merged into a V8 entry.
-  if (id == v8::HeapProfiler::kUnknownObjectId) {
-    id = ids_->FindMergedNativeEntry(obj);
-  }
-  return id;
-}
-
 void HeapProfiler::ObjectMoveEvent(Address from, Address to, int size) {
   base::MutexGuard guard(&profiler_mutex_);
   bool known_object = ids_->MoveObject(from, to, size);

deps/v8/src/profiler/heap-profiler.h

@@ -52,7 +52,6 @@ class HeapProfiler : public HeapObjectAllocationTracker {
   int GetSnapshotsCount();
   HeapSnapshot* GetSnapshot(int index);
   SnapshotObjectId GetSnapshotObjectId(Handle<Object> obj);
-  SnapshotObjectId GetSnapshotObjectId(NativeObject obj);
   void DeleteAllSnapshots();
   void RemoveSnapshot(HeapSnapshot* snapshot);