Count closures using the feedback vector cell map, specialize if count==1.

src/compiler/js-create-lowering.cc

 // Copyright 2016 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/compiler/js-create-lowering.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
@@ skipping 192 matching lines @@
 }  // namespace
 
 Reduction JSCreateLowering::Reduce(Node* node) {
   switch (node->opcode()) {
     case IrOpcode::kJSCreate:
       return ReduceJSCreate(node);
     case IrOpcode::kJSCreateArguments:
       return ReduceJSCreateArguments(node);
     case IrOpcode::kJSCreateArray:
       return ReduceJSCreateArray(node);
-    case IrOpcode::kJSCreateClosure:
-      return ReduceJSCreateClosure(node);
     case IrOpcode::kJSCreateIterResultObject:
       return ReduceJSCreateIterResultObject(node);
     case IrOpcode::kJSCreateKeyValueArray:
       return ReduceJSCreateKeyValueArray(node);
     case IrOpcode::kJSCreateLiteralArray:
     case IrOpcode::kJSCreateLiteralObject:
       return ReduceJSCreateLiteral(node);
     case IrOpcode::kJSCreateFunctionContext:
       return ReduceJSCreateFunctionContext(node);
     case IrOpcode::kJSCreateWithContext:
@@ skipping 520 matching lines @@
           length_type->Min() == length_type->Max()) {
         int capacity = static_cast<int>(length_type->Max());
         return ReduceNewArray(node, length, capacity, site);
       }
     }
   }
 
   return ReduceNewArrayToStubCall(node, site);
 }
 
-Reduction JSCreateLowering::ReduceJSCreateClosure(Node* node) {
-  if (!FLAG_turbo_lower_create_closure) return NoChange();
-  DCHECK_EQ(IrOpcode::kJSCreateClosure, node->opcode());
-  CreateClosureParameters const& p = CreateClosureParametersOf(node->op());
-  Handle<SharedFunctionInfo> shared = p.shared_info();
-  Node* effect = NodeProperties::GetEffectInput(node);
-  Node* control = NodeProperties::GetControlInput(node);
-  Node* context = NodeProperties::GetContextInput(node);
-
-  int const function_map_index =
-      Context::FunctionMapIndex(shared->language_mode(), shared->kind());
-  Node* function_map = jsgraph()->HeapConstant(
-      handle(Map::cast(native_context()->get(function_map_index)), isolate()));
-
-  FeedbackSlot slot = p.feedback().slot();
-  Node* literals_cell = jsgraph()->HeapConstant(
-      handle(Cell::cast(p.feedback().vector()->Get(slot)), isolate()));
-
-  // Note that it is only safe to embed the raw entry point of the compile
-  // lazy stub into the code, because that stub is immortal and immovable.
-  Node* compile_entry = jsgraph()->PointerConstant(
-      jsgraph()->isolate()->builtins()->CompileLazy()->entry());
-  Node* empty_fixed_array = jsgraph()->EmptyFixedArrayConstant();
-  Node* the_hole = jsgraph()->TheHoleConstant();
-  Node* undefined = jsgraph()->UndefinedConstant();
-  AllocationBuilder a(jsgraph(), effect, control);
-  STATIC_ASSERT(JSFunction::kSize == 9 * kPointerSize);
-  a.Allocate(JSFunction::kSize, p.pretenure());
-  a.Store(AccessBuilder::ForMap(), function_map);
-  a.Store(AccessBuilder::ForJSObjectProperties(), empty_fixed_array);
-  a.Store(AccessBuilder::ForJSObjectElements(), empty_fixed_array);
-  a.Store(AccessBuilder::ForJSFunctionFeedbackVector(), literals_cell);
-  a.Store(AccessBuilder::ForJSFunctionPrototypeOrInitialMap(), the_hole);
-  a.Store(AccessBuilder::ForJSFunctionSharedFunctionInfo(), shared);
-  a.Store(AccessBuilder::ForJSFunctionContext(), context);
-  a.Store(AccessBuilder::ForJSFunctionCodeEntry(), compile_entry);
-  a.Store(AccessBuilder::ForJSFunctionNextFunctionLink(), undefined);
-  RelaxControls(node);
-  a.FinishAndChange(node);
-  return Changed(node);
-}
-
 Reduction JSCreateLowering::ReduceJSCreateIterResultObject(Node* node) {
   DCHECK_EQ(IrOpcode::kJSCreateIterResultObject, node->opcode());
   Node* value = NodeProperties::GetValueInput(node, 0);
   Node* done = NodeProperties::GetValueInput(node, 1);
   Node* effect = NodeProperties::GetEffectInput(node);
 
   Node* iterator_result_map = jsgraph()->HeapConstant(
       handle(native_context()->iterator_result_map(), isolate()));
 
   // Emit code to allocate the JSIteratorResult instance.
@@ skipping 584 matching lines @@
   return jsgraph()->simplified();
 }
 
 MachineOperatorBuilder* JSCreateLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8