VM support for running Kernel binaries.

runtime/vm/scopes.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_SCOPES_H_
 #define VM_SCOPES_H_
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "vm/allocation.h"
@@ skipping 15 matching lines @@
                 const AbstractType& type)
     : token_pos_(token_pos),
       name_(name),
       owner_(NULL),
       type_(type),
       const_value_(NULL),
       is_final_(false),
       is_captured_(false),
       is_invisible_(false),
       is_captured_parameter_(false),
+      is_forced_stack_(false),
       index_(LocalVariable::kUninitializedIndex) {
     ASSERT(type.IsZoneHandle() || type.IsReadOnlyHandle());
     ASSERT(type.IsFinalized());
     ASSERT(name.IsSymbol());
   }
 
   TokenPosition token_pos() const { return token_pos_; }
   const String& name() const { return name_; }
   LocalScope* owner() const { return owner_; }
   void set_owner(LocalScope* owner) {
     ASSERT(owner_ == NULL);
     owner_ = owner;
   }
 
   const AbstractType& type() const { return type_; }
 
   bool is_final() const { return is_final_; }
   void set_is_final() { is_final_ = true; }
 
   bool is_captured() const { return is_captured_; }
   void set_is_captured() { is_captured_ = true; }
 
+  // Variables marked as forced to stack are skipped and not captured by
+  // CaptureLocalVariables - which iterates scope chain between two scopes
+  // and indiscriminately marks all variables as captured.
+  // TODO(27590) remove the hardcoded blacklist from CaptureLocalVariables
+  bool is_forced_stack() const { return is_forced_stack_; }
+  void set_is_forced_stack() { is_forced_stack_ = true; }
+
   bool HasIndex() const {
     return index_ != kUninitializedIndex;
   }
   int index() const {
     ASSERT(HasIndex());
     return index_;
   }
 
   // Assign an index to a local.
   void set_index(int index) {
@@ skipping 47 matching lines @@
 
   const AbstractType& type_;  // Declaration type of local variable.
 
   const Instance* const_value_;   // NULL or compile-time const value.
 
   bool is_final_;  // If true, this variable is readonly.
   bool is_captured_;  // If true, this variable lives in the context, otherwise
                       // in the stack frame.
   bool is_invisible_;
   bool is_captured_parameter_;
+  bool is_forced_stack_;
   int index_;  // Allocation index in words relative to frame pointer (if not
                // captured), or relative to the context pointer (if captured).
 
   friend class LocalScope;
   DISALLOW_COPY_AND_ASSIGN(LocalVariable);
 };
 
 
 class NameReference : public ZoneAllocated {
  public:
@@ skipping 189 matching lines @@
 
   // Creates variable info for the scope and all its nested scopes.
   // Must be called after AllocateVariables() has been called.
   RawLocalVarDescriptors* GetVarDescriptors(const Function& func);
 
   // Create a ContextScope object describing all captured variables referenced
   // from this scope and belonging to outer scopes.
   RawContextScope* PreserveOuterScope(int current_context_level) const;
 
   // Mark all local variables that are accessible from this scope up to
-  // top_scope (included) as captured.
+  // top_scope (included) as captured unless they are marked as forced to stack.
   void CaptureLocalVariables(LocalScope* top_scope);
 
   // Creates a LocalScope representing the outer scope of a local function to be
   // compiled. This outer scope contains the variables captured by the function
   // as specified by the given ContextScope, which was created during the
   // compilation of the enclosing function.
   static LocalScope* RestoreOuterScope(const ContextScope& context_scope);
 
   // Create a ContextScope object which will capture "this" for an implicit
   // closure object.
@@ skipping 33 matching lines @@
   // List of names referenced in this scope and its children that
   // are not resolved to local variables.
   GrowableArray<NameReference*> referenced_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_SCOPES_H_