deps: patch V8 to 12.9.202.26

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 12
 #define V8_MINOR_VERSION 9
 #define V8_BUILD_NUMBER 202
-#define V8_PATCH_LEVEL 19
+#define V8_PATCH_LEVEL 26
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/flags/flag-definitions.h

@@ -566,8 +566,8 @@ DEFINE_BOOL(maglev_inlining, true,
             "enable inlining in the maglev optimizing compiler")
 DEFINE_BOOL(maglev_loop_peeling, true,
             "enable loop peeling in the maglev optimizing compiler")
-DEFINE_BOOL(maglev_optimistic_peeled_loops, true,
-            "enable aggressive optimizations for loops (loop SPeeling) in the "
+DEFINE_BOOL(maglev_optimistic_peeled_loops, false,
+            "enable speculation on loop state using peeling as fallback in the "
             "maglev optimizing compiler")
 DEFINE_INT(maglev_loop_peeling_max_size, 200,
            "max loop size for loop peeling in the maglev optimizing compiler")
@@ -582,6 +582,7 @@ DEFINE_BOOL(maglev_destroy_on_background, true,
 DEFINE_BOOL(maglev_inline_api_calls, false,
             "Inline CallApiCallback builtin into generated code")
 DEFINE_EXPERIMENTAL_FEATURE(maglev_licm, "loop invariant code motion")
+DEFINE_WEAK_IMPLICATION(maglev_future, maglev_optimistic_peeled_loops)
 DEFINE_WEAK_IMPLICATION(maglev_future, maglev_speculative_hoist_phi_untagging)
 DEFINE_WEAK_IMPLICATION(maglev_future, maglev_inline_api_calls)
 DEFINE_WEAK_IMPLICATION(maglev_future, maglev_escape_analysis)
@@ -2499,7 +2500,7 @@ DEFINE_BOOL_READONLY(fast_map_update, false,
 DEFINE_INT(max_valid_polymorphic_map_count, 4,
            "maximum number of valid maps to track in POLYMORPHIC state")
 DEFINE_BOOL(
-    clone_object_sidestep_transitions, true,
+    clone_object_sidestep_transitions, false,
     "support sidestep transitions for dependency tracking object clone maps")
 DEFINE_WEAK_IMPLICATION(future, clone_object_sidestep_transitions)
 

deps/v8/src/maglev/maglev-graph-builder.cc

@@ -1370,7 +1370,14 @@ DeoptFrame MaglevGraphBuilder::GetDeoptFrameForLazyDeoptHelper(
         current_source_position_, GetParentDeoptFrame());
     ret.frame_state()->ForEachValue(
         *compilation_unit_, [this](ValueNode* node, interpreter::Register reg) {
-          AddDeoptUse(node);
+          // Receiver and closure values have to be materialized, even if
+          // they don't otherwise escape.
+          if (reg == interpreter::Register::receiver() ||
+              reg == interpreter::Register::function_closure()) {
+            node->add_use();
+          } else {
+            AddDeoptUse(node);
+          }
         });
     AddDeoptUse(ret.closure());
     return ret;
@@ -6965,15 +6972,21 @@ void MaglevGraphBuilder::VisitDeletePropertySloppy() {
 
 void MaglevGraphBuilder::VisitGetSuperConstructor() {
   ValueNode* active_function = GetAccumulator();
-  ValueNode* map_proto;
+  // TODO(victorgomes): Maybe BuildLoadTaggedField should support constants
+  // instead.
   if (compiler::OptionalHeapObjectRef constant =
           TryGetConstant(active_function)) {
-    map_proto = GetConstant(constant->map(broker()).prototype(broker()));
-  } else {
-    ValueNode* map =
-        BuildLoadTaggedField(active_function, HeapObject::kMapOffset);
-    map_proto = BuildLoadTaggedField(map, Map::kPrototypeOffset);
+    compiler::MapRef map = constant->map(broker());
+    if (map.is_stable()) {
+      broker()->dependencies()->DependOnStableMap(map);
+      ValueNode* map_proto = GetConstant(map.prototype(broker()));
+      StoreRegister(iterator_.GetRegisterOperand(0), map_proto);
+      return;
+    }
   }
+  ValueNode* map =
+      BuildLoadTaggedField(active_function, HeapObject::kMapOffset);
+  ValueNode* map_proto = BuildLoadTaggedField(map, Map::kPrototypeOffset);
   StoreRegister(iterator_.GetRegisterOperand(0), map_proto);
 }
 

deps/v8/src/parsing/parser-base.h

@@ -620,26 +620,32 @@ class ParserBase {
       return instance_members_scope != nullptr;
     }
 
-    DeclarationScope* EnsureStaticElementsScope(ParserBase* parser,
-                                                int beg_pos) {
+    DeclarationScope* EnsureStaticElementsScope(ParserBase* parser, int beg_pos,
+                                                int info_id) {
       if (!has_static_elements()) {
         static_elements_scope = parser->NewFunctionScope(
             FunctionKind::kClassStaticInitializerFunction);
         static_elements_scope->SetLanguageMode(LanguageMode::kStrict);
         static_elements_scope->set_start_position(beg_pos);
-        static_elements_function_id = parser->GetNextInfoId();
+        static_elements_function_id = info_id;
+        // Actually consume the id. The id that was passed in might be an
+        // earlier id in case of computed property names.
+        parser->GetNextInfoId();
       }
       return static_elements_scope;
     }
 
     DeclarationScope* EnsureInstanceMembersScope(ParserBase* parser,
-                                                 int beg_pos) {
+                                                 int beg_pos, int info_id) {
       if (!has_instance_members()) {
         instance_members_scope = parser->NewFunctionScope(
             FunctionKind::kClassMembersInitializerFunction);
         instance_members_scope->SetLanguageMode(LanguageMode::kStrict);
         instance_members_scope->set_start_position(beg_pos);
-        instance_members_function_id = parser->GetNextInfoId();
+        instance_members_function_id = info_id;
+        // Actually consume the id. The id that was passed in might be an
+        // earlier id in case of computed property names.
+        parser->GetNextInfoId();
       }
       return instance_members_scope;
     }
@@ -1321,7 +1327,7 @@ class ParserBase {
                             ParseFunctionFlags flags, bool is_static,
                             bool* has_seen_constructor);
   ExpressionT ParseMemberInitializer(ClassInfo* class_info, int beg_pos,
-                                     bool is_static);
+                                     int info_id, bool is_static);
   BlockT ParseClassStaticBlock(ClassInfo* class_info);
   ObjectLiteralPropertyT ParseObjectPropertyDefinition(
       ParsePropertyInfo* prop_info, bool* has_seen_proto);
@@ -2624,6 +2630,8 @@ ParserBase<Impl>::ParseClassPropertyDefinition(ClassInfo* class_info,
   DCHECK_NOT_NULL(class_info);
   DCHECK_EQ(prop_info->position, PropertyPosition::kClassLiteral);
 
+  int next_info_id = PeekNextInfoId();
+
   Token::Value name_token = peek();
   int property_beg_pos = peek_position();
   int name_token_position = property_beg_pos;
@@ -2667,12 +2675,18 @@ ParserBase<Impl>::ParseClassPropertyDefinition(ClassInfo* class_info,
                                         // field.
       DCHECK_IMPLIES(prop_info->is_computed_name, !prop_info->is_private);
 
-      if (!prop_info->is_computed_name) {
+      if (prop_info->is_computed_name) {
+        if (!has_error() && next_info_id != PeekNextInfoId() &&
+            !(prop_info->is_static ? class_info->has_static_elements()
+                                   : class_info->has_instance_members())) {
+          impl()->ReindexComputedMemberName(name_expression);
+        }
+      } else {
         CheckClassFieldName(prop_info->name, prop_info->is_static);
       }
 
-      ExpressionT value = ParseMemberInitializer(class_info, property_beg_pos,
-                                                 prop_info->is_static);
+      ExpressionT value = ParseMemberInitializer(
+          class_info, property_beg_pos, next_info_id, prop_info->is_static);
       ExpectSemicolon();
 
       ClassLiteralPropertyT result;
@@ -2786,11 +2800,12 @@ ParserBase<Impl>::ParseClassPropertyDefinition(ClassInfo* class_info,
 
 template <typename Impl>
 typename ParserBase<Impl>::ExpressionT ParserBase<Impl>::ParseMemberInitializer(
-    ClassInfo* class_info, int beg_pos, bool is_static) {
+    ClassInfo* class_info, int beg_pos, int info_id, bool is_static) {
   FunctionParsingScope body_parsing_scope(impl());
   DeclarationScope* initializer_scope =
-      is_static ? class_info->EnsureStaticElementsScope(this, beg_pos)
-                : class_info->EnsureInstanceMembersScope(this, beg_pos);
+      is_static
+          ? class_info->EnsureStaticElementsScope(this, beg_pos, info_id)
+          : class_info->EnsureInstanceMembersScope(this, beg_pos, info_id);
 
   if (Check(Token::kAssign)) {
     FunctionState initializer_state(&function_state_, &scope_,
@@ -2811,7 +2826,7 @@ typename ParserBase<Impl>::BlockT ParserBase<Impl>::ParseClassStaticBlock(
   Consume(Token::kStatic);
 
   DeclarationScope* initializer_scope =
-      class_info->EnsureStaticElementsScope(this, position());
+      class_info->EnsureStaticElementsScope(this, position(), PeekNextInfoId());
 
   FunctionState initializer_state(&function_state_, &scope_, initializer_scope);
   FunctionParsingScope body_parsing_scope(impl());

deps/v8/src/parsing/parser.cc

@@ -2735,6 +2735,13 @@ void Parser::ReindexArrowFunctionFormalParameters(
   }
 }
 
+void Parser::ReindexComputedMemberName(Expression* computed_name) {
+  // Make space for the member initializer function above the computed property
+  // name.
+  AstFunctionLiteralIdReindexer reindexer(stack_limit_, 1);
+  reindexer.Reindex(computed_name);
+}
+
 void Parser::PrepareGeneratorVariables() {
   // Calling a generator returns a generator object.  That object is stored
   // in a temporary variable, a definition that is used by "yield"

deps/v8/src/parsing/parser.h

@@ -894,6 +894,7 @@ class V8_EXPORT_PRIVATE Parser : public NON_EXPORTED_BASE(ParserBase<Parser>) {
   }
 
   void ReindexArrowFunctionFormalParameters(ParserFormalParameters* parameters);
+  void ReindexComputedMemberName(Expression* computed_name);
   void DeclareArrowFunctionFormalParameters(
       ParserFormalParameters* parameters, Expression* params,
       const Scanner::Location& params_loc);

deps/v8/src/parsing/preparser.h

@@ -1556,6 +1556,8 @@ class PreParser : public ParserBase<PreParser> {
 
   V8_INLINE void ReindexArrowFunctionFormalParameters(
       PreParserFormalParameters* parameters) {}
+  V8_INLINE void ReindexComputedMemberName(
+      const PreParserExpression& expression) {}
   V8_INLINE void DeclareFormalParameters(
       const PreParserFormalParameters* parameters) {
     if (!parameters->is_simple) parameters->scope->SetHasNonSimpleParameters();

deps/v8/src/wasm/graph-builder-interface.cc

@@ -1206,14 +1206,15 @@ class WasmGraphBuildingInterface {
 
   void BrOnNonNull(FullDecoder* decoder, const Value& ref_object, Value* result,
                    uint32_t depth, bool /* drop_null_on_fallthrough */) {
-    result->node = ref_object.node;
     SsaEnv* false_env = ssa_env_;
     SsaEnv* true_env = Split(decoder->zone(), false_env);
     false_env->SetNotMerged();
     std::tie(false_env->control, true_env->control) =
         builder_->BrOnNull(ref_object.node, ref_object.type);
     builder_->SetControl(false_env->control);
     ScopedSsaEnv scoped_env(this, true_env);
+    // Make sure the TypeGuard has the right Control dependency.
+    SetAndTypeNode(result, builder_->TypeGuard(ref_object.node, result->type));
     BrOrRet(decoder, depth);
   }
 

deps/v8/src/wasm/streaming-decoder.cc

@@ -294,6 +294,10 @@ void AsyncStreamingDecoder::Finish(bool can_use_compiled_module) {
   if (!full_wire_bytes_.back().empty()) {
     size_t total_length = 0;
     for (auto& bytes : full_wire_bytes_) total_length += bytes.size();
+    if (ok()) {
+      // {DecodeSectionLength} enforces this with graceful error reporting.
+      CHECK_LE(total_length, max_module_size());
+    }
     auto all_bytes = base::OwnedVector<uint8_t>::NewForOverwrite(total_length);
     uint8_t* ptr = all_bytes.begin();
     for (auto& bytes : full_wire_bytes_) {
@@ -627,6 +631,18 @@ std::unique_ptr<AsyncStreamingDecoder::DecodingState>
 AsyncStreamingDecoder::DecodeSectionLength::NextWithValue(
     AsyncStreamingDecoder* streaming) {
   TRACE_STREAMING("DecodeSectionLength(%zu)\n", value_);
+  // Check if this section fits into the overall module length limit.
+  // Note: {this->module_offset_} is the position of the section ID byte,
+  // {streaming->module_offset_} is the start of the section's payload (i.e.
+  // right after the just-decoded section length varint).
+  // The latter can already exceed the max module size, when the previous
+  // section barely fit into it, and this new section's ID or length crossed
+  // the threshold.
+  uint32_t payload_start = streaming->module_offset();
+  size_t max_size = max_module_size();
+  if (payload_start > max_size || max_size - payload_start < value_) {
+    return streaming->ToErrorState();
+  }
   SectionBuffer* buf =
       streaming->CreateNewBuffer(module_offset_, section_id_, value_,
                                  buffer().SubVector(0, bytes_consumed_));

deps/v8/src/wasm/wasm-engine.cc

@@ -2016,10 +2016,11 @@ uint32_t max_table_init_entries() {
 
 // {max_module_size} is declared in wasm-limits.h.
 size_t max_module_size() {
-  // Clamp the value of --wasm-max-module-size between 16 and just below 2GB.
+  // Clamp the value of --wasm-max-module-size between 16 and the maximum
+  // that the implementation supports.
   constexpr size_t kMin = 16;
-  constexpr size_t kMax = RoundDown<kSystemPointerSize>(size_t{kMaxInt});
-  static_assert(kMin <= kV8MaxWasmModuleSize && kV8MaxWasmModuleSize <= kMax);
+  constexpr size_t kMax = kV8MaxWasmModuleSize;
+  static_assert(kMin <= kV8MaxWasmModuleSize);
   return std::clamp(v8_flags.wasm_max_module_size.value(), kMin, kMax);
 }
 

deps/v8/src/wasm/wasm-js.cc

@@ -202,8 +202,8 @@ GET_FIRST_ARGUMENT_AS(Tag)
 #undef GET_FIRST_ARGUMENT_AS
 
 i::wasm::ModuleWireBytes GetFirstArgumentAsBytes(
-    const v8::FunctionCallbackInfo<v8::Value>& info, ErrorThrower* thrower,
-    bool* is_shared) {
+    const v8::FunctionCallbackInfo<v8::Value>& info, size_t max_length,
+    ErrorThrower* thrower, bool* is_shared) {
   DCHECK(i::ValidateCallbackInfo(info));
   const uint8_t* start = nullptr;
   size_t length = 0;
@@ -234,7 +234,6 @@ i::wasm::ModuleWireBytes GetFirstArgumentAsBytes(
   if (length == 0) {
     thrower->CompileError("BufferSource argument is empty");
   }
-  size_t max_length = i::wasm::max_module_size();
   if (length > max_length) {
     // The spec requires a CompileError for implementation-defined limits, see
     // https://webassembly.github.io/spec/js-api/index.html#limits.
@@ -637,7 +636,8 @@ void WebAssemblyCompileImpl(const v8::FunctionCallbackInfo<v8::Value>& info) {
       new AsyncCompilationResolver(isolate, context, promise_resolver));
 
   bool is_shared = false;
-  auto bytes = GetFirstArgumentAsBytes(info, &thrower, &is_shared);
+  auto bytes = GetFirstArgumentAsBytes(info, i::wasm::max_module_size(),
+                                       &thrower, &is_shared);
   if (thrower.error()) {
     resolver->OnCompilationFailed(thrower.Reify());
     return;
@@ -669,8 +669,11 @@ void WasmStreamingCallbackForTesting(
       v8::WasmStreaming::Unpack(info.GetIsolate(), info.Data());
 
   bool is_shared = false;
+  // We don't check the buffer length up front, to allow d8 to test that the
+  // streaming decoder implementation handles overly large inputs correctly.
+  size_t unlimited = std::numeric_limits<size_t>::max();
   i::wasm::ModuleWireBytes bytes =
-      GetFirstArgumentAsBytes(info, &thrower, &is_shared);
+      GetFirstArgumentAsBytes(info, unlimited, &thrower, &is_shared);
   if (thrower.error()) {
     streaming->Abort(Utils::ToLocal(thrower.Reify()));
     return;
@@ -771,7 +774,8 @@ void WebAssemblyValidateImpl(const v8::FunctionCallbackInfo<v8::Value>& info) {
   ErrorThrower thrower(i_isolate, "WebAssembly.validate()");
 
   bool is_shared = false;
-  auto bytes = GetFirstArgumentAsBytes(info, &thrower, &is_shared);
+  auto bytes = GetFirstArgumentAsBytes(info, i::wasm::max_module_size(),
+                                       &thrower, &is_shared);
 
   v8::ReturnValue<v8::Value> return_value = info.GetReturnValue();
 
@@ -850,7 +854,8 @@ void WebAssemblyModuleImpl(const v8::FunctionCallbackInfo<v8::Value>& info) {
   }
 
   bool is_shared = false;
-  auto bytes = GetFirstArgumentAsBytes(info, &thrower, &is_shared);
+  auto bytes = GetFirstArgumentAsBytes(info, i::wasm::max_module_size(),
+                                       &thrower, &is_shared);
 
   if (thrower.error()) {
     return;
@@ -1168,7 +1173,8 @@ void WebAssemblyInstantiateImpl(
   }
 
   bool is_shared = false;
-  auto bytes = GetFirstArgumentAsBytes(info, &thrower, &is_shared);
+  auto bytes = GetFirstArgumentAsBytes(info, i::wasm::max_module_size(),
+                                       &thrower, &is_shared);
   if (thrower.error()) {
     resolver->OnInstantiationFailed(thrower.Reify());
     return;

deps/v8/test/mjsunit/maglev/regress-369630648.js

@@ -0,0 +1,18 @@
+// Copyright 2024 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.
+//
+// Flags: --allow-natives-syntax --no-lazy-feedback-allocation
+
+class C extends Array {
+  constructor() {
+      (() => (() => super())())();
+  }
+}
+%PrepareFunctionForOptimization(C);
+new C();
+new C();
+%OptimizeFunctionOnNextCall(C);
+new C();
+C.__proto__ = [1];
+assertThrows(() => { new C() }, TypeError);

deps/v8/test/mjsunit/regress/regress-363538434.js

@@ -0,0 +1,9 @@
+// Copyright 2024 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.
+
+try {
+  new class {
+      static [function(){}] = [].trigger_error();
+  }
+} catch (e) {}

deps/v8/test/mjsunit/regress/regress-366323452.js

@@ -0,0 +1,7 @@
+// Copyright 2024 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.
+
+assertThrows(`new class {
+    static [{aaa(){}];
+};`);