Revert of Remove Scope::scope_uses_this_ flag

src/scopes.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/accessors.h"
 #include "src/bootstrapper.h"
 #include "src/messages.h"
 #include "src/parser.h"
@@ skipping 147 matching lines @@
   receiver_ = NULL;
   new_target_ = nullptr;
   function_ = NULL;
   arguments_ = NULL;
   illegal_redecl_ = NULL;
   scope_inside_with_ = false;
   scope_contains_with_ = false;
   scope_calls_eval_ = false;
   scope_uses_arguments_ = false;
   scope_uses_super_property_ = false;
+  scope_uses_this_ = false;
   asm_module_ = false;
   asm_function_ = outer_scope != NULL && outer_scope->asm_module_;
   // Inherit the language mode from the parent scope.
   language_mode_ = outer_scope != NULL ? outer_scope->language_mode_ : SLOPPY;
   outer_scope_calls_sloppy_eval_ = false;
   inner_scope_calls_eval_ = false;
   inner_scope_uses_arguments_ = false;
+  inner_scope_uses_this_ = false;
   inner_scope_uses_super_property_ = false;
   force_eager_compilation_ = false;
   force_context_allocation_ = (outer_scope != NULL && !is_function_scope())
       ? outer_scope->has_forced_context_allocation() : false;
   num_var_or_const_ = 0;
   num_stack_slots_ = 0;
   num_heap_slots_ = 0;
   num_modules_ = 0;
   module_var_ = NULL,
   rest_parameter_ = NULL;
@@ skipping 177 matching lines @@
   }
 
   // Move unresolved variables
   for (int i = 0; i < unresolved_.length(); i++) {
     outer_scope()->unresolved_.Add(unresolved_[i], zone());
   }
 
   // Propagate usage flags to outer scope.
   if (uses_arguments()) outer_scope_->RecordArgumentsUsage();
   if (uses_super_property()) outer_scope_->RecordSuperPropertyUsage();
+  if (uses_this()) outer_scope_->RecordThisUsage();
   if (scope_calls_eval_) outer_scope_->RecordEvalCall();
 
   return NULL;
 }
 
 
 Variable* Scope::LookupLocal(const AstRawString* name) {
   Variable* result = variables_.Lookup(name);
   if (result != NULL || scope_info_.is_null()) {
     return result;
@@ skipping 529 matching lines @@
     Indent(n1, "// strong mode scope\n");
   } else if (is_strict(language_mode())) {
     Indent(n1, "// strict mode scope\n");
   }
   if (scope_inside_with_) Indent(n1, "// scope inside 'with'\n");
   if (scope_contains_with_) Indent(n1, "// scope contains 'with'\n");
   if (scope_calls_eval_) Indent(n1, "// scope calls 'eval'\n");
   if (scope_uses_arguments_) Indent(n1, "// scope uses 'arguments'\n");
   if (scope_uses_super_property_)
     Indent(n1, "// scope uses 'super' property\n");
+  if (scope_uses_this_) Indent(n1, "// scope uses 'this'\n");
   if (inner_scope_uses_arguments_) {
     Indent(n1, "// inner scope uses 'arguments'\n");
   }
   if (inner_scope_uses_super_property_)
     Indent(n1, "// inner scope uses 'super' property\n");
+  if (inner_scope_uses_this_) Indent(n1, "// inner scope uses 'this'\n");
   if (outer_scope_calls_sloppy_eval_) {
     Indent(n1, "// outer scope calls 'eval' in sloppy context\n");
   }
   if (inner_scope_calls_eval_) Indent(n1, "// inner scope calls 'eval'\n");
   if (num_stack_slots_ > 0) { Indent(n1, "// ");
   PrintF("%d stack slots\n", num_stack_slots_); }
   if (num_heap_slots_ > 0) { Indent(n1, "// ");
   PrintF("%d heap slots\n", num_heap_slots_); }
 
   // Print locals.
@@ skipping 335 matching lines @@
     // usage of arguments/super/this, but do not propagate them out from normal
     // functions.
     if (!inner->is_function_scope() || inner->is_arrow_scope()) {
       if (inner->scope_uses_arguments_ || inner->inner_scope_uses_arguments_) {
         inner_scope_uses_arguments_ = true;
       }
       if (inner->scope_uses_super_property_ ||
           inner->inner_scope_uses_super_property_) {
         inner_scope_uses_super_property_ = true;
       }
+      if (inner->scope_uses_this_ || inner->inner_scope_uses_this_) {
+        inner_scope_uses_this_ = true;
+      }
     }
     if (inner->force_eager_compilation_) {
       force_eager_compilation_ = true;
     }
     if (asm_module_ && inner->scope_type() == FUNCTION_SCOPE) {
       inner->asm_function_ = true;
     }
   }
 }
 
@@ skipping 252 matching lines @@
       (function_ != NULL && function_->proxy()->var()->IsStackLocal() ? 1 : 0);
 }
 
 
 int Scope::ContextLocalCount() const {
   if (num_heap_slots() == 0) return 0;
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS -
       (function_ != NULL && function_->proxy()->var()->IsContextSlot() ? 1 : 0);
 }
 } }  // namespace v8::internal