deps: update V8 to 5.4.500.31

PR-URL: #8852
Reviewed-By: Franziska Hinkelmann <franzih@chromium.org>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: targos

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 5
 #define V8_MINOR_VERSION 4
 #define V8_BUILD_NUMBER 500
-#define V8_PATCH_LEVEL 27
+#define V8_PATCH_LEVEL 31
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/api.h

@@ -389,6 +389,7 @@ class HandleScopeImplementer {
         call_depth_(0),
         microtasks_depth_(0),
         microtasks_suppressions_(0),
+        entered_context_count_during_microtasks_(0),
 #ifdef DEBUG
         debug_microtasks_depth_(0),
 #endif
@@ -454,6 +455,11 @@ class HandleScopeImplementer {
   inline void EnterMicrotaskContext(Handle<Context> context);
   inline void LeaveMicrotaskContext();
   inline Handle<Context> MicrotaskContext();
+  inline bool MicrotaskContextIsLastEnteredContext() const {
+    return microtask_context_ &&
+           entered_context_count_during_microtasks_ ==
+               entered_contexts_.length();
+  }
 
   inline void SaveContext(Context* context);
   inline Context* RestoreContext();
@@ -474,6 +480,7 @@ class HandleScopeImplementer {
     entered_contexts_.Initialize(0);
     saved_contexts_.Initialize(0);
     microtask_context_ = nullptr;
+    entered_context_count_during_microtasks_ = 0;
     spare_ = NULL;
     last_handle_before_deferred_block_ = NULL;
     call_depth_ = 0;
@@ -508,6 +515,7 @@ class HandleScopeImplementer {
   int call_depth_;
   int microtasks_depth_;
   int microtasks_suppressions_;
+  int entered_context_count_during_microtasks_;
 #ifdef DEBUG
   int debug_microtasks_depth_;
 #endif
@@ -579,11 +587,13 @@ Handle<Context> HandleScopeImplementer::LastEnteredContext() {
 void HandleScopeImplementer::EnterMicrotaskContext(Handle<Context> context) {
   DCHECK(!microtask_context_);
   microtask_context_ = *context;
+  entered_context_count_during_microtasks_ = entered_contexts_.length();
 }
 
 void HandleScopeImplementer::LeaveMicrotaskContext() {
   DCHECK(microtask_context_);
   microtask_context_ = nullptr;
+  entered_context_count_during_microtasks_ = 0;
 }
 
 Handle<Context> HandleScopeImplementer::MicrotaskContext() {

deps/v8/src/builtins/builtins.cc

@@ -280,13 +280,12 @@ bool Builtins::AllowDynamicFunction(Isolate* isolate, Handle<JSFunction> target,
                                     Handle<JSObject> target_global_proxy) {
   if (FLAG_allow_unsafe_function_constructor) return true;
   HandleScopeImplementer* impl = isolate->handle_scope_implementer();
-  Handle<Context> responsible_context = impl->LastEnteredContext();
+  Handle<Context> responsible_context =
+      impl->MicrotaskContextIsLastEnteredContext() ? impl->MicrotaskContext()
+                                                   : impl->LastEnteredContext();
+  // TODO(jochen): Remove this.
   if (responsible_context.is_null()) {
-    responsible_context = impl->MicrotaskContext();
-    // TODO(jochen): Remove this.
-    if (responsible_context.is_null()) {
-      return true;
-    }
+    return true;
   }
   if (*responsible_context == target->context()) return true;
   return isolate->MayAccess(responsible_context, target_global_proxy);

deps/v8/src/compiler/access-info.cc

@@ -312,7 +312,9 @@ bool AccessInfoFactory::ComputePropertyAccessInfo(
                                           isolate());
               dependencies()->AssumeFieldType(field_owner_map);
             }
-            DCHECK(field_type->Is(Type::TaggedPointer()));
+            if (access_mode == AccessMode::kLoad) {
+              field_type = Type::Any();
+            }
           }
           *access_info = PropertyAccessInfo::DataField(
               MapList{receiver_map}, field_index, field_type, holder);

deps/v8/src/compiler/arm/code-generator-arm.cc

@@ -1878,10 +1878,7 @@ void CodeGenerator::AssembleMove(InstructionOperand* source,
         case Constant::kHeapObject: {
           Handle<HeapObject> src_object = src.ToHeapObject();
           Heap::RootListIndex index;
-          int slot;
-          if (IsMaterializableFromFrame(src_object, &slot)) {
-            __ ldr(dst, g.SlotToMemOperand(slot));
-          } else if (IsMaterializableFromRoot(src_object, &index)) {
+          if (IsMaterializableFromRoot(src_object, &index)) {
             __ LoadRoot(dst, index);
           } else {
             __ Move(dst, src_object);

deps/v8/src/compiler/arm64/code-generator-arm64.cc

@@ -1939,10 +1939,7 @@ void CodeGenerator::AssembleMove(InstructionOperand* source,
       if (src.type() == Constant::kHeapObject) {
         Handle<HeapObject> src_object = src.ToHeapObject();
         Heap::RootListIndex index;
-        int slot;
-        if (IsMaterializableFromFrame(src_object, &slot)) {
-          __ Ldr(dst, g.SlotToMemOperand(slot, masm()));
-        } else if (IsMaterializableFromRoot(src_object, &index)) {
+        if (IsMaterializableFromRoot(src_object, &index)) {
           __ LoadRoot(dst, index);
         } else {
           __ LoadObject(dst, src_object);

deps/v8/src/compiler/ast-loop-assignment-analyzer.cc

@@ -252,10 +252,12 @@ void ALAA::VisitForStatement(ForStatement* loop) {
 
 
 void ALAA::VisitForInStatement(ForInStatement* loop) {
+  Expression* l = loop->each();
   Enter(loop);
-  Visit(loop->each());
+  Visit(l);
   Visit(loop->subject());
   Visit(loop->body());
+  if (l->IsVariableProxy()) AnalyzeAssignment(l->AsVariableProxy()->var());
   Exit(loop);
 }
 

deps/v8/src/compiler/code-generator.cc

@@ -278,21 +278,6 @@ void CodeGenerator::RecordSafepoint(ReferenceMap* references,
   }
 }
 
-bool CodeGenerator::IsMaterializableFromFrame(Handle<HeapObject> object,
-                                              int* slot_return) {
-  if (linkage()->GetIncomingDescriptor()->IsJSFunctionCall()) {
-    if (object.is_identical_to(info()->context()) && !info()->is_osr()) {
-      *slot_return = Frame::kContextSlot;
-      return true;
-    } else if (object.is_identical_to(info()->closure())) {
-      *slot_return = Frame::kJSFunctionSlot;
-      return true;
-    }
-  }
-  return false;
-}
-
-
 bool CodeGenerator::IsMaterializableFromRoot(
     Handle<HeapObject> object, Heap::RootListIndex* index_return) {
   const CallDescriptor* incoming_descriptor =

deps/v8/src/compiler/code-generator.h

@@ -84,9 +84,6 @@ class CodeGenerator final : public GapResolver::Assembler {
   void RecordSafepoint(ReferenceMap* references, Safepoint::Kind kind,
                        int arguments, Safepoint::DeoptMode deopt_mode);
 
-  // Check if a heap object can be materialized by loading from the frame, which
-  // is usually way cheaper than materializing the actual heap object constant.
-  bool IsMaterializableFromFrame(Handle<HeapObject> object, int* slot_return);
   // Check if a heap object can be materialized by loading from a heap root,
   // which is cheaper on some platforms than materializing the actual heap
   // object constant.

deps/v8/src/compiler/ia32/code-generator-ia32.cc

@@ -2040,18 +2040,7 @@ void CodeGenerator::AssembleMove(InstructionOperand* source,
     Constant src_constant = g.ToConstant(source);
     if (src_constant.type() == Constant::kHeapObject) {
       Handle<HeapObject> src = src_constant.ToHeapObject();
-      int slot;
-      if (IsMaterializableFromFrame(src, &slot)) {
-        if (destination->IsRegister()) {
-          Register dst = g.ToRegister(destination);
-          __ mov(dst, g.SlotToOperand(slot));
-        } else {
-          DCHECK(destination->IsStackSlot());
-          Operand dst = g.ToOperand(destination);
-          __ push(g.SlotToOperand(slot));
-          __ pop(dst);
-        }
-      } else if (destination->IsRegister()) {
+      if (destination->IsRegister()) {
         Register dst = g.ToRegister(destination);
         __ LoadHeapObject(dst, src);
       } else {