deps: patch V8 to 12.8.374.31

common.gypi

@@ -36,7 +36,7 @@
 
     # 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.14',
+    'v8_embedder_string': '-node.15',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 12
 #define V8_MINOR_VERSION 8
 #define V8_BUILD_NUMBER 374
-#define V8_PATCH_LEVEL 22
+#define V8_PATCH_LEVEL 31
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/ast/ast-function-literal-id-reindexer.cc

@@ -31,13 +31,6 @@ void AstFunctionLiteralIdReindexer::VisitFunctionLiteral(FunctionLiteral* lit) {
   lit->set_function_literal_id(lit->function_literal_id() + delta_);
 }
 
-void AstFunctionLiteralIdReindexer::VisitCall(Call* expr) {
-  AstTraversalVisitor::VisitCall(expr);
-  if (expr->is_possibly_eval()) {
-    expr->adjust_eval_scope_info_index(delta_);
-  }
-}
-
 void AstFunctionLiteralIdReindexer::VisitClassLiteral(ClassLiteral* expr) {
   // Manually visit the class literal so that we can change the property walk.
   // This should be kept in-sync with AstTraversalVisitor::VisitClassLiteral.

deps/v8/src/ast/ast-function-literal-id-reindexer.h

@@ -30,7 +30,6 @@ class AstFunctionLiteralIdReindexer final
   // AstTraversalVisitor implementation.
   void VisitFunctionLiteral(FunctionLiteral* lit);
   void VisitClassLiteral(ClassLiteral* lit);
-  void VisitCall(Call* lit);
 
  private:
   int delta_;

deps/v8/src/ast/ast.h

@@ -1731,7 +1731,7 @@ class CallBase : public Expression {
 class Call final : public CallBase {
  public:
   bool is_possibly_eval() const {
-    return EvalScopeInfoIndexField::decode(bit_field_) > 0;
+    return IsPossiblyEvalField::decode(bit_field_);
   }
 
   bool is_tagged_template() const {
@@ -1742,15 +1742,6 @@ class Call final : public CallBase {
     return IsOptionalChainLinkField::decode(bit_field_);
   }
 
-  uint32_t eval_scope_info_index() const {
-    return EvalScopeInfoIndexField::decode(bit_field_);
-  }
-
-  void adjust_eval_scope_info_index(int delta) {
-    bit_field_ = EvalScopeInfoIndexField::update(
-        bit_field_, eval_scope_info_index() + delta);
-  }
-
   enum CallType {
     GLOBAL_CALL,
     WITH_CALL,
@@ -1766,6 +1757,11 @@ class Call final : public CallBase {
     OTHER_CALL,
   };
 
+  enum PossiblyEval {
+    IS_POSSIBLY_EVAL,
+    NOT_EVAL,
+  };
+
   // Helpers to determine how to handle the call.
   CallType GetCallType() const;
 
@@ -1777,26 +1773,26 @@ class Call final : public CallBase {
 
   Call(Zone* zone, Expression* expression,
        const ScopedPtrList<Expression>& arguments, int pos, bool has_spread,
-       int eval_scope_info_index, bool optional_chain)
+       PossiblyEval possibly_eval, bool optional_chain)
       : CallBase(zone, kCall, expression, arguments, pos, has_spread) {
-    bit_field_ |= IsTaggedTemplateField::encode(false) |
-                  IsOptionalChainLinkField::encode(optional_chain) |
-                  EvalScopeInfoIndexField::encode(eval_scope_info_index);
-    DCHECK_EQ(eval_scope_info_index > 0, is_possibly_eval());
+    bit_field_ |=
+        IsPossiblyEvalField::encode(possibly_eval == IS_POSSIBLY_EVAL) |
+        IsTaggedTemplateField::encode(false) |
+        IsOptionalChainLinkField::encode(optional_chain);
   }
 
   Call(Zone* zone, Expression* expression,
        const ScopedPtrList<Expression>& arguments, int pos,
        TaggedTemplateTag tag)
       : CallBase(zone, kCall, expression, arguments, pos, false) {
-    bit_field_ |= IsTaggedTemplateField::encode(true) |
-                  IsOptionalChainLinkField::encode(false) |
-                  EvalScopeInfoIndexField::encode(0);
+    bit_field_ |= IsPossiblyEvalField::encode(false) |
+                  IsTaggedTemplateField::encode(true) |
+                  IsOptionalChainLinkField::encode(false);
   }
 
-  using IsTaggedTemplateField = CallBase::NextBitField<bool, 1>;
+  using IsPossiblyEvalField = CallBase::NextBitField<bool, 1>;
+  using IsTaggedTemplateField = IsPossiblyEvalField::Next<bool, 1>;
   using IsOptionalChainLinkField = IsTaggedTemplateField::Next<bool, 1>;
-  using EvalScopeInfoIndexField = IsOptionalChainLinkField::Next<uint32_t, 20>;
 };
 
 class CallNew final : public CallBase {
@@ -3188,11 +3184,12 @@ class AstNodeFactory final {
 
   Call* NewCall(Expression* expression,
                 const ScopedPtrList<Expression>& arguments, int pos,
-                bool has_spread, int eval_scope_info_index = 0,
+                bool has_spread,
+                Call::PossiblyEval possibly_eval = Call::NOT_EVAL,
                 bool optional_chain = false) {
-    DCHECK_IMPLIES(eval_scope_info_index > 0, !optional_chain);
+    DCHECK_IMPLIES(possibly_eval == Call::IS_POSSIBLY_EVAL, !optional_chain);
     return zone_->New<Call>(zone_, expression, arguments, pos, has_spread,
-                            eval_scope_info_index, optional_chain);
+                            possibly_eval, optional_chain);
   }
 
   SuperCallForwardArgs* NewSuperCallForwardArgs(SuperCallReference* expression,

deps/v8/src/ast/scopes.cc

@@ -2607,23 +2607,6 @@ void ModuleScope::AllocateModuleVariables() {
   }
 }
 
-// Needs to be kept in sync with ScopeInfo::UniqueIdInScript.
-int Scope::UniqueIdInScript() const {
-  // Script scopes start "before" the script to avoid clashing with a scope that
-  // starts on character 0.
-  if (is_script_scope() || scope_type() == EVAL_SCOPE ||
-      scope_type() == MODULE_SCOPE) {
-    return -1;
-  }
-  if (is_declaration_scope()) {
-    // Default constructors have the same start position as their parent class
-    // scope. Use the next char position to distinguish this scope.
-    return start_position() +
-           IsDefaultConstructor(AsDeclarationScope()->function_kind());
-  }
-  return start_position();
-}
-
 void Scope::AllocateVariablesRecursively() {
   this->ForEach([](Scope* scope) -> Iteration {
     DCHECK(!scope->already_resolved_);
@@ -2675,62 +2658,33 @@ void Scope::AllocateVariablesRecursively() {
 }
 
 template <typename IsolateT>
-void Scope::AllocateScopeInfosRecursively(
-    IsolateT* isolate, MaybeHandle<ScopeInfo> outer_scope,
-    std::unordered_map<int, Handle<ScopeInfo>>& scope_infos_to_reuse) {
+void Scope::AllocateScopeInfosRecursively(IsolateT* isolate,
+                                          MaybeHandle<ScopeInfo> outer_scope) {
   DCHECK(scope_info_.is_null());
   MaybeHandle<ScopeInfo> next_outer_scope = outer_scope;
 
-  auto it = scope_infos_to_reuse.find(UniqueIdInScript());
-  if (it != scope_infos_to_reuse.end()) {
-    scope_info_ = it->second;
-    CHECK(NeedsContext());
-    // The ScopeInfo chain mirrors the context chain, so we only link to the
-    // next outer scope that needs a context.
-    next_outer_scope = scope_info_;
-    DCHECK(!scope_info_.is_null());
-    DCHECK(!is_hidden_catch_scope());
-    CHECK_EQ(scope_info_->scope_type(), scope_type_);
-    CHECK_EQ(scope_info_->ContextLength(), num_heap_slots_);
-#ifdef DEBUG
-    // Consume the scope info.
-    it->second = {};
-#endif
-  } else if (NeedsScopeInfo()) {
-#ifdef DEBUG
-    // Mark this ID as being used. Skip hidden scopes because they are
-    // synthetic, unreusable, but hard to make unique.
-    if (v8_flags.reuse_scope_infos && !is_hidden_catch_scope()) {
-      scope_infos_to_reuse[UniqueIdInScript()] = {};
-    }
-#endif
+  if (NeedsScopeInfo()) {
     scope_info_ = ScopeInfo::Create(isolate, zone(), this, outer_scope);
-    DCHECK_EQ(UniqueIdInScript(), scope_info_->UniqueIdInScript());
-    // The ScopeInfo chain mirrors the context chain, so we only link to the
-    // next outer scope that needs a context.
+    // The ScopeInfo chain should mirror the context chain, so we only link to
+    // the next outer scope that needs a context.
     if (NeedsContext()) next_outer_scope = scope_info_;
   }
 
   // Allocate ScopeInfos for inner scopes.
   for (Scope* scope = inner_scope_; scope != nullptr; scope = scope->sibling_) {
-    DCHECK_IMPLIES(scope->sibling_, scope->sibling_->UniqueIdInScript() !=
-                                        scope->UniqueIdInScript());
     if (!scope->is_function_scope() ||
         scope->AsDeclarationScope()->ShouldEagerCompile()) {
-      scope->AllocateScopeInfosRecursively(isolate, next_outer_scope,
-                                           scope_infos_to_reuse);
+      scope->AllocateScopeInfosRecursively(isolate, next_outer_scope);
     }
   }
 }
 
 template EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) void Scope::
-    AllocateScopeInfosRecursively<Isolate>(
-        Isolate* isolate, MaybeHandle<ScopeInfo> outer_scope,
-        std::unordered_map<int, Handle<ScopeInfo>>& scope_infos_to_reuse);
+    AllocateScopeInfosRecursively<Isolate>(Isolate* isolate,
+                                           MaybeHandle<ScopeInfo> outer_scope);
 template EXPORT_TEMPLATE_DEFINE(V8_EXPORT_PRIVATE) void Scope::
     AllocateScopeInfosRecursively<LocalIsolate>(
-        LocalIsolate* isolate, MaybeHandle<ScopeInfo> outer_scope,
-        std::unordered_map<int, Handle<ScopeInfo>>& scope_infos_to_reuse);
+        LocalIsolate* isolate, MaybeHandle<ScopeInfo> outer_scope);
 
 void DeclarationScope::RecalcPrivateNameContextChain() {
   // The outermost scope in a class heritage expression is marked to skip the
@@ -2775,9 +2729,7 @@ void DeclarationScope::RecordNeedsPrivateNameContextChainRecalc() {
 
 // static
 template <typename IsolateT>
-void DeclarationScope::AllocateScopeInfos(ParseInfo* info,
-                                          Handle<Script> script,
-                                          IsolateT* isolate) {
+void DeclarationScope::AllocateScopeInfos(ParseInfo* info, IsolateT* isolate) {
   DeclarationScope* scope = info->literal()->scope();
 
   // No one else should have allocated a scope info for this scope yet.
@@ -2792,49 +2744,7 @@ void DeclarationScope::AllocateScopeInfos(ParseInfo* info,
   if (scope->needs_private_name_context_chain_recalc()) {
     scope->RecalcPrivateNameContextChain();
   }
-
-  Tagged<WeakFixedArray> infos = script->infos();
-  std::unordered_map<int, Handle<ScopeInfo>> scope_infos_to_reuse;
-  if (v8_flags.reuse_scope_infos && infos->length() != 0) {
-    Tagged<SharedFunctionInfo> sfi = *info->literal()->shared_function_info();
-    Tagged<ScopeInfo> outer = sfi->HasOuterScopeInfo()
-                                  ? sfi->GetOuterScopeInfo()
-                                  : Tagged<ScopeInfo>();
-    // Look at all the existing inner functions (they are numbered id+1 until
-    // max_id+1) to reattach their outer scope infos to corresponding scopes.
-    for (int i = info->literal()->function_literal_id() + 1;
-         i < info->max_info_id() + 1; ++i) {
-      Tagged<MaybeObject> maybe_info = infos->get(i);
-      if (maybe_info.IsWeak()) {
-        Tagged<Object> info = maybe_info.GetHeapObjectAssumeWeak();
-        Tagged<ScopeInfo> scope_info;
-        if (Is<SharedFunctionInfo>(info)) {
-          Tagged<SharedFunctionInfo> sfi = Cast<SharedFunctionInfo>(info);
-          // Reuse outer scope infos. Don't look at sfi->scope_info() because
-          // that might be empty if the sfi isn't compiled yet.
-          if (!sfi->HasOuterScopeInfo()) continue;
-          scope_info = sfi->GetOuterScopeInfo();
-        } else {
-          scope_info = Cast<ScopeInfo>(info);
-        }
-        while (true) {
-          if (scope_info == outer) break;
-          int id = scope_info->UniqueIdInScript();
-          auto it = scope_infos_to_reuse.find(id);
-          if (it != scope_infos_to_reuse.end()) {
-            CHECK_EQ(*it->second, scope_info);
-            break;
-          }
-          scope_infos_to_reuse[id] = handle(scope_info, isolate);
-          if (!scope_info->HasOuterScopeInfo()) break;
-          scope_info = scope_info->OuterScopeInfo();
-        }
-      }
-    }
-  }
-
-  scope->AllocateScopeInfosRecursively(isolate, outer_scope,
-                                       scope_infos_to_reuse);
+  scope->AllocateScopeInfosRecursively(isolate, outer_scope);
 
   // The debugger expects all shared function infos to contain a scope info.
   // Since the top-most scope will end up in a shared function info, make sure
@@ -2853,9 +2763,9 @@ void DeclarationScope::AllocateScopeInfos(ParseInfo* info,
 }
 
 template V8_EXPORT_PRIVATE void DeclarationScope::AllocateScopeInfos(
-    ParseInfo* info, Handle<Script> script, Isolate* isolate);
+    ParseInfo* info, Isolate* isolate);
 template V8_EXPORT_PRIVATE void DeclarationScope::AllocateScopeInfos(
-    ParseInfo* info, Handle<Script> script, LocalIsolate* isolate);
+    ParseInfo* info, LocalIsolate* isolate);
 
 int Scope::ContextLocalCount() const {
   if (num_heap_slots() == 0) return 0;

deps/v8/src/ast/scopes.h

@@ -101,11 +101,6 @@ class V8_EXPORT_PRIVATE Scope : public NON_EXPORTED_BASE(ZoneObject) {
   }
 #endif
 
-  // An ID that uniquely identifies this scope within the script. Inner scopes
-  // have a higher ID than their outer scopes. ScopeInfo created from a scope
-  // has the same ID as the scope.
-  int UniqueIdInScript() const;
-
   DeclarationScope* AsDeclarationScope();
   const DeclarationScope* AsDeclarationScope() const;
   ModuleScope* AsModuleScope();
@@ -339,10 +334,6 @@ class V8_EXPORT_PRIVATE Scope : public NON_EXPORTED_BASE(ZoneObject) {
   bool is_hidden() const { return is_hidden_; }
   void set_is_hidden() { is_hidden_ = true; }
 
-  bool is_hidden_catch_scope() const {
-    return is_hidden() && scope_type() == CATCH_SCOPE;
-  }
-
   void ForceContextAllocationForParameters() {
     DCHECK(!already_resolved_);
     force_context_allocation_for_parameters_ = true;
@@ -728,9 +719,11 @@ class V8_EXPORT_PRIVATE Scope : public NON_EXPORTED_BASE(ZoneObject) {
   void AllocateVariablesRecursively();
 
   template <typename IsolateT>
-  void AllocateScopeInfosRecursively(
-      IsolateT* isolate, MaybeHandle<ScopeInfo> outer_scope,
-      std::unordered_map<int, Handle<ScopeInfo>>& scope_infos_to_reuse);
+  void AllocateScopeInfosRecursively(IsolateT* isolate,
+                                     MaybeHandle<ScopeInfo> outer_scope);
+
+  void AllocateDebuggerScopeInfos(Isolate* isolate,
+                                  MaybeHandle<ScopeInfo> outer_scope);
 
   // Construct a scope based on the scope info.
   Scope(Zone* zone, ScopeType type, AstValueFactory* ast_value_factory,
@@ -830,6 +823,10 @@ class V8_EXPORT_PRIVATE Scope : public NON_EXPORTED_BASE(ZoneObject) {
 
   bool must_use_preparsed_scope_data_ : 1;
 
+  // True if this is a script scope that originated from
+  // DebugEvaluate::GlobalREPL().
+  bool is_repl_mode_scope_ : 1;
+
   // True if this is a deserialized scope which caches its lookups on another
   // Scope's variable map. This will be true for every scope above the first
   // non-eval declaration scope above the compilation entry point, e.g. for
@@ -1164,7 +1161,6 @@ class V8_EXPORT_PRIVATE DeclarationScope : public Scope {
   // Does nothing if ScopeInfo is already allocated.
   template <typename IsolateT>
   V8_EXPORT_PRIVATE static void AllocateScopeInfos(ParseInfo* info,
-                                                   Handle<Script> script,
                                                    IsolateT* isolate);
 
   // Determine if we can use lazy compilation for this scope.

deps/v8/src/builtins/builtins-function.cc

@@ -84,10 +84,11 @@ MaybeHandle<Object> CreateDynamicFunction(Isolate* isolate,
   // come from here.
   Handle<JSFunction> function;
   {
-    ASSIGN_RETURN_ON_EXCEPTION(isolate, function,
-                               Compiler::GetFunctionFromString(
-                                   handle(target->native_context(), isolate),
-                                   source, parameters_end_pos, is_code_like));
+    ASSIGN_RETURN_ON_EXCEPTION(
+        isolate, function,
+        Compiler::GetFunctionFromString(
+            handle(target->native_context(), isolate), source,
+            ONLY_SINGLE_FUNCTION_LITERAL, parameters_end_pos, is_code_like));
     Handle<Object> result;
     ASSIGN_RETURN_ON_EXCEPTION(
         isolate, result,

deps/v8/src/codegen/background-merge-task.h

@@ -73,7 +73,7 @@ class V8_EXPORT_PRIVATE BackgroundMergeTask {
   // SharedFunctionInfo in the cached script. The main thread must:
   // 1. Check whether the cached script gained corresponding SharedFunctionInfos
   //    for any of these, and if so, redo the merge.
-  // 2. Update the cached script's infos list to refer to these.
+  // 2. Update the cached script's shared_function_infos list to refer to these.
   std::vector<Handle<SharedFunctionInfo>> used_new_sfis_;
 
   // SharedFunctionInfos from the cached script which were not compiled, with