Use a different map to distinguish eval contexts

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 852 matching lines @@
         return Replace(value);
       }
     }
   }
 
   return NoChange();
 }
 
 Reduction JSCreateLowering::ReduceJSCreateFunctionContext(Node* node) {
   DCHECK_EQ(IrOpcode::kJSCreateFunctionContext, node->opcode());
-  int slot_count = OpParameter<int>(node->op());
+  const CreateFunctionContextParameters& parameters =
+      CreateFunctionContextParametersOf(node->op());
+  int slot_count = parameters.slot_count();
+  ScopeType scope_type = parameters.scope_type();
   Node* const closure = NodeProperties::GetValueInput(node, 0);
 
   // Use inline allocation for function contexts up to a size limit.
   if (slot_count < kFunctionContextAllocationLimit) {
     // JSCreateFunctionContext[slot_count < limit]](fun)
     Node* effect = NodeProperties::GetEffectInput(node);
     Node* control = NodeProperties::GetControlInput(node);
     Node* context = NodeProperties::GetContextInput(node);
     Node* extension = jsgraph()->TheHoleConstant();
     AllocationBuilder a(jsgraph(), effect, control);
     STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == 4);  // Ensure fully covered.
     int context_length = slot_count + Context::MIN_CONTEXT_SLOTS;
-    a.AllocateArray(context_length, factory()->function_context_map());
+    Handle<Map> map;
+    switch (scope_type) {
+      case EVAL_SCOPE:
+        map = factory()->eval_context_map();
+        break;
+      case FUNCTION_SCOPE:
+        map = factory()->function_context_map();
+        break;
+      default:
+        UNREACHABLE();
+    }
+    a.AllocateArray(context_length, map);
     a.Store(AccessBuilder::ForContextSlot(Context::CLOSURE_INDEX), closure);
     a.Store(AccessBuilder::ForContextSlot(Context::PREVIOUS_INDEX), context);
     a.Store(AccessBuilder::ForContextSlot(Context::EXTENSION_INDEX), extension);
     a.Store(AccessBuilder::ForContextSlot(Context::NATIVE_CONTEXT_INDEX),
             jsgraph()->HeapConstant(native_context()));
     for (int i = Context::MIN_CONTEXT_SLOTS; i < context_length; ++i) {
       a.Store(AccessBuilder::ForContextSlot(i), jsgraph()->UndefinedConstant());
     }
     RelaxControls(node);
     a.FinishAndChange(node);
@@ skipping 464 matching lines @@
   return jsgraph()->simplified();
 }
 
 MachineOperatorBuilder* JSCreateLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8