[scopes]: With --print-scopes, print preparsed scopes before destroying them.

src/ast/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/ast/scopes.h"
 
 #include <set>
 
 #include "src/accessors.h"
 #include "src/ast/ast.h"
@@ skipping 609 matching lines @@
   // Ensuring that the outer script scope has a scope info avoids having
   // special case for native contexts vs other contexts.
   if (info->script_scope()->scope_info_.is_null()) {
     info->script_scope()->scope_info_ =
         handle(ScopeInfo::Empty(info->isolate()));
   }
 
 #ifdef DEBUG
   if (info->script_is_native() ? FLAG_print_builtin_scopes
                                : FLAG_print_scopes) {
+    PrintF("Global scope:\n");
     scope->Print();
   }
   scope->CheckScopePositions();
   scope->CheckZones();
 #endif
 }
 
 void DeclarationScope::DeclareThis(AstValueFactory* ast_value_factory) {
   DCHECK(!already_resolved_);
   DCHECK(is_declaration_scope());
@@ skipping 777 matching lines @@
       arguments_ = nullptr;
     }
 
     if (FLAG_preparser_scope_analysis) {
       // Decide context allocation for the locals and parameters and store the
       // info away.
       AllocateVariablesRecursively();
       CollectVariableData(preparsed_scope_data);
     }
   }
+#ifdef DEBUG
+  if (FLAG_print_scopes) {
+    PrintF("Inner function scope:\n");
+    Print();
+  }
+#endif
 
   ResetAfterPreparsing(ast_node_factory->ast_value_factory(), false);
 
   unresolved_ = unresolved;
 }
 
 #ifdef DEBUG
 namespace {
 
 const char* Header(ScopeType scope_type, FunctionKind function_kind,
@@ skipping 65 matching lines @@
   }
   PrintF("\n");
 }
 
 void PrintMap(int indent, const char* label, VariableMap* map, bool locals,
               Variable* function_var) {
   bool printed_label = false;
   for (VariableMap::Entry* p = map->Start(); p != nullptr; p = map->Next(p)) {
     Variable* var = reinterpret_cast<Variable*>(p->value);
     if (var == function_var) continue;
+    if (var == kDummyPreParserVariable ||
+        var == kDummyPreParserLexicalVariable) {
+      continue;
+    }
     bool local = !IsDynamicVariableMode(var->mode());
     if ((locals ? local : !local) &&
         (var->is_used() || !var->IsUnallocated())) {
       if (!printed_label) {
         Indent(indent, label);
         printed_label = true;
       }
       PrintVar(indent, var);
     }
   }
@@ skipping 685 matching lines @@
   Variable* function =
       is_function_scope() ? AsDeclarationScope()->function_var() : nullptr;
   bool is_function_var_in_context =
       function != nullptr && function->IsContextSlot();
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS -
          (is_function_var_in_context ? 1 : 0);
 }
 
 }  // namespace internal
 }  // namespace v8