Reimplement stack manipulations for LiveEdit

src/scopeinfo.h

Index: src/scopeinfo.h
diff --git a/src/scopeinfo.h b/src/scopeinfo.h
index 9fb26d033981725d7cc19a9fb0bdfe6edc410ff7..c1d9545e1c23c99a18f4fab7d2ccd5d06438ab7d 100644
--- a/src/scopeinfo.h
+++ b/src/scopeinfo.h
@@ -46,6 +46,18 @@ namespace internal {
 // DebugInfo seems misleading, since this information is primarily used
 // in debugging-unrelated contexts.
 
+// Define state of the function execution. It reflects whether locals are
+// available or not.
+enum FunctionScopeState {
+  // Function is in a normal state.
+  FUNCTION_SCOPE_NORMAL,
+
+  // LiveEdit stack manipulation has reset the function execution:
+  // all below frame pointer (arguments, 'this' and outer context) is
+  // available, but locals are not.
+  FUNCTION_SCOPE_NOT_ENTERED
+};
+
 // Forward defined as
 // template <class Allocator = FreeStoreAllocationPolicy> class ScopeInfo;
 template<class Allocator>
@@ -55,7 +67,7 @@ class ScopeInfo BASE_EMBEDDED {
   explicit ScopeInfo(Scope* scope);
 
   // Create a ScopeInfo instance from a Code object.
-  explicit ScopeInfo(Code* code);
+  explicit ScopeInfo(Code* code, FunctionScopeState scope_state);
 
   // Write the ScopeInfo data into a Code object, and returns the
   // amount of space that was needed. If no Code object is provided
@@ -162,8 +174,8 @@ class ZoneScopeInfo: public ScopeInfo<ZoneListAllocationPolicy> {
       : ScopeInfo<ZoneListAllocationPolicy>(scope) {}
 
   // Create a ZoneScopeInfo instance from a Code object.
-  explicit ZoneScopeInfo(Code* code)
-      :  ScopeInfo<ZoneListAllocationPolicy>(code) {}
+  explicit ZoneScopeInfo(Code* code, FunctionScopeState scope_state)
+      :  ScopeInfo<ZoneListAllocationPolicy>(code, scope_state) {}
 };