[stubs] GetPropertyStub added.

src/code-stub-assembler.h

 // Copyright 2016 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.
 
 #ifndef V8_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
+#include <functional>
+
 #include "src/compiler/code-assembler.h"
 #include "src/objects.h"
 
 namespace v8 {
 namespace internal {
 
 class CallInterfaceDescriptor;
 class StatsCounter;
 class StubCache;
 
@@ skipping 245 matching lines @@
     return BitFieldDecode(word32, T::kShift, T::kMask);
   }
 
   compiler::Node* BitFieldDecode(compiler::Node* word32, uint32_t shift,
                                  uint32_t mask);
 
   void SetCounter(StatsCounter* counter, int value);
   void IncrementCounter(StatsCounter* counter, int delta);
   void DecrementCounter(StatsCounter* counter, int delta);
 
+  // Generates "if (false) goto label" code. Useful for marking a label as
+  // "live" to avoid assertion failures during graph building. In the resulting
+  // code this check will be eliminated.
+  void Use(Label* label);
+
   // Various building blocks for stubs doing property lookups.
   void TryToName(compiler::Node* key, Label* if_keyisindex, Variable* var_index,
                  Label* if_keyisunique, Label* if_bailout);
 
   // Calculates array index for given dictionary entry and entry field.
   // See Dictionary::EntryToIndex().
   template <typename Dictionary>
   compiler::Node* EntryToIndex(compiler::Node* entry, int field_index);
   template <typename Dictionary>
   compiler::Node* EntryToIndex(compiler::Node* entry) {
@@ skipping 63 matching lines @@
                          compiler::Node* unique_name, Label* if_found_fast,
                          Label* if_found_dict, Label* if_found_global,
                          Variable* var_meta_storage, Variable* var_name_index,
                          Label* if_not_found, Label* if_bailout);
 
   void TryLookupElement(compiler::Node* object, compiler::Node* map,
                         compiler::Node* instance_type, compiler::Node* index,
                         Label* if_found, Label* if_not_found,
                         Label* if_bailout);
 
+  // This is a type of a lookup in holder generator function. In case of a
+  // property lookup the {key} is guaranteed to be a unique name and in case of
+  // element lookup the key is an Int32 index.
+  typedef std::function<void(compiler::Node* receiver, compiler::Node* holder,
+                             compiler::Node* map, compiler::Node* instance_type,
+                             compiler::Node* key, Label* next_holder,
+                             Label* if_bailout)>
+      LookupInHolder;
+
+  // Generic property prototype chain lookup generator.
+  // For properties it generates lookup using given {lookup_property_in_holder}
+  // and for elements it uses {lookup_element_in_holder}.
+  // Upon reaching the end of prototype chain the control goes to {if_end}.
+  // If it can't handle the case {receiver}/{key} case then the control goes
+  // to {if_bailout}.
+  void TryPrototypeChainLookup(compiler::Node* receiver, compiler::Node* key,
+                               LookupInHolder& lookup_property_in_holder,
+                               LookupInHolder& lookup_element_in_holder,
+                               Label* if_end, Label* if_bailout);
+
   // Instanceof helpers.
   // ES6 section 7.3.19 OrdinaryHasInstance (C, O)
   compiler::Node* OrdinaryHasInstance(compiler::Node* context,
                                       compiler::Node* callable,
                                       compiler::Node* object);
 
   // LoadIC helpers.
   struct LoadICParameters {
     LoadICParameters(compiler::Node* context, compiler::Node* receiver,
                      compiler::Node* name, compiler::Node* slot,
@@ skipping 66 matching lines @@
                                        AllocationFlags flags,
                                        compiler::Node* top_adddress,
                                        compiler::Node* limit_address);
 
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_