Share literals arrays per <NativeContext, SharedFunctionInfo> pair.

src/code-stubs-hydrogen.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/code-stubs.h"
 
 #include "src/bailout-reason.h"
 #include "src/field-index.h"
 #include "src/hydrogen.h"
 #include "src/ic/ic.h"
@@ skipping 1649 matching lines @@
     HValue* js_function,
     HValue* native_context,
     IfBuilder* builder,
     HValue* optimized_map,
     HValue* map_index) {
   HValue* osr_ast_id_none = Add<HConstant>(BailoutId::None().ToInt());
   HValue* context_slot = LoadFromOptimizedCodeMap(
       optimized_map, map_index, SharedFunctionInfo::kContextOffset);
   HValue* osr_ast_slot = LoadFromOptimizedCodeMap(
       optimized_map, map_index, SharedFunctionInfo::kOsrAstIdOffset);
+  HValue* code_object = LoadFromOptimizedCodeMap(
+      optimized_map, map_index, SharedFunctionInfo::kCachedCodeOffset);
   builder->If<HCompareObjectEqAndBranch>(native_context,
                                          context_slot);
   builder->AndIf<HCompareObjectEqAndBranch>(osr_ast_slot, osr_ast_id_none);
+  builder->And();
+  builder->IfNot<HCompareObjectEqAndBranch>(code_object,
+                                            graph()->GetConstant0());
   builder->Then();
-  HValue* code_object = LoadFromOptimizedCodeMap(optimized_map,
-      map_index, SharedFunctionInfo::kCachedCodeOffset);
   // and the literals

[Michael Starzinger, 2015/09/22 10:44:39]

nit: This comment doesn't provide any value anymore, let's drop it.

[Igor Sheludko, 2015/09/22 12:58:10]

Done.

   HValue* literals = LoadFromOptimizedCodeMap(optimized_map,
       map_index, SharedFunctionInfo::kLiteralsOffset);
 
   BuildInstallOptimizedCode(js_function, native_context, code_object, literals);
 
   // The builder continues in the "then" after this function.
 }
 
 
 void CodeStubGraphBuilderBase::BuildInstallOptimizedCode(HValue* js_function,
@@ skipping 522 matching lines @@
   return Pop();
 }
 
 
 Handle<Code> KeyedLoadGenericStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 }  // namespace internal
 }  // namespace v8