Crankshaft part of the 'loads and stores to global vars through property cell shortcuts' feature.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index b7e9903f05aa078e458654341a77b464fc231e33..c7838a0eac0816536d5102e8a86432fc78a5a5cf 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -119,6 +119,7 @@ class LChunkBuilder;
   V(LoadFieldByIndex)                         \
   V(LoadFunctionPrototype)                    \
   V(LoadGlobalGeneric)                        \
+  V(LoadGlobalViaContext)                     \
   V(LoadKeyed)                                \
   V(LoadKeyedGeneric)                         \
   V(LoadNamedField)                           \
@@ -147,6 +148,7 @@ class LChunkBuilder;
   V(StoreCodeEntry)                           \
   V(StoreContextSlot)                         \
   V(StoreFrameContext)                        \
+  V(StoreGlobalViaContext)                    \
   V(StoreKeyed)                               \
   V(StoreKeyedGeneric)                        \
   V(StoreNamedField)                          \
@@ -5445,6 +5447,39 @@ class HLoadGlobalGeneric final : public HTemplateInstruction<2> {
 };
 
 
+class HLoadGlobalViaContext final : public HTemplateInstruction<1> {
+ public:
+  DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P3(HLoadGlobalViaContext,
+                                              Handle<String>, int, int);

[Jakob Kummerow, 2015/07/19 10:34:53]

s/Handle<String>/Handle<Name>/ here and below? Since HLoadGlobalGeneric uses
Strings too, it probably doesn't matter much.

[Igor Sheludko, 2015/07/20 08:42:00]

This operation is about writing to global via variables, which has only string
names. So it's ok.
Probably I should update name's type in HStoreGlobalViaContext to be
Handle<String> as well.

+
+  HValue* context() { return OperandAt(0); }
+  Handle<String> name() const { return name_; }
+  int depth() const { return depth_; }
+  int slot_index() const { return slot_index_; }
+
+  std::ostream& PrintDataTo(std::ostream& os) const override;  // NOLINT
+
+  Representation RequiredInputRepresentation(int index) override {
+    return Representation::Tagged();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(LoadGlobalViaContext)
+
+ private:
+  HLoadGlobalViaContext(HValue* context, Handle<String> name, int depth,
+                        int slot_index)
+      : name_(name), depth_(depth), slot_index_(slot_index) {
+    SetOperandAt(0, context);
+    set_representation(Representation::Tagged());
+    SetAllSideEffects();
+  }
+
+  Handle<String> name_;
+  int depth_;
+  int slot_index_;
+};
+
+
 class HAllocate final : public HTemplateInstruction<2> {
  public:
   static bool CompatibleInstanceTypes(InstanceType type1,
@@ -6979,6 +7014,45 @@ class HStoreNamedGeneric final : public HTemplateInstruction<3> {
 };
 
 
+class HStoreGlobalViaContext final : public HTemplateInstruction<2> {
+ public:
+  DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P5(HStoreGlobalViaContext,
+                                              Handle<Name>, HValue*, int, int,
+                                              LanguageMode);
+  HValue* context() const { return OperandAt(0); }
+  HValue* value() const { return OperandAt(1); }
+  Handle<Name> name() const { return name_; }
+  int depth() const { return depth_; }
+  int slot_index() const { return slot_index_; }
+  LanguageMode language_mode() const { return language_mode_; }
+
+  std::ostream& PrintDataTo(std::ostream& os) const override;  // NOLINT
+
+  Representation RequiredInputRepresentation(int index) override {
+    return Representation::Tagged();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(StoreGlobalViaContext)
+
+ private:
+  HStoreGlobalViaContext(HValue* context, Handle<Name> name, HValue* value,
+                         int depth, int slot_index, LanguageMode language_mode)
+      : name_(name),
+        depth_(depth),
+        slot_index_(slot_index),
+        language_mode_(language_mode) {
+    SetOperandAt(0, context);
+    SetOperandAt(1, value);
+    SetAllSideEffects();
+  }
+
+  Handle<Name> name_;
+  int depth_;
+  int slot_index_;
+  LanguageMode language_mode_;
+};
+
+
 class HStoreKeyed final : public HTemplateInstruction<3>,
                           public ArrayInstructionInterface {
  public: