Loads and stores to global vars are now made via property cell shortcuts installed into parent scri…

src/code-stubs.h

 // 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.
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 60 matching lines @@
   V(ElementsTransitionAndStore)             \
   V(FastCloneShallowArray)                  \
   V(FastCloneShallowObject)                 \
   V(FastNewClosure)                         \
   V(FastNewContext)                         \
   V(GrowArrayElements)                      \
   V(InternalArrayNArgumentsConstructor)     \
   V(InternalArrayNoArgumentConstructor)     \
   V(InternalArraySingleArgumentConstructor) \
   V(KeyedLoadGeneric)                       \
+  V(LoadGlobalViaContext)                   \
   V(LoadScriptContextField)                 \
   V(LoadDictionaryElement)                  \
   V(NameDictionaryLookup)                   \
   V(NumberToString)                         \
   V(Typeof)                                 \
   V(RegExpConstructResult)                  \
   V(StoreFastElement)                       \
+  V(StoreGlobalViaContext)                  \
   V(StoreScriptContextField)                \
   V(StringAdd)                              \
   V(ToBoolean)                              \
   V(TransitionElementsKind)                 \
   V(KeyedLoadIC)                            \
   V(LoadIC)                                 \
   /* TurboFanCodeStubs */                   \
   V(StringLengthTF)                         \
   V(StringAddTF)                            \
   V(MathFloor)                              \
@@ skipping 1236 matching lines @@
  private:
   class CellTypeBits : public BitField<PropertyCellType, 0, 2> {};
   class ConstantTypeBits : public BitField<PropertyCellConstantType, 2, 2> {};
   class RepresentationBits : public BitField<Representation::Kind, 4, 8> {};
   class CheckGlobalBits : public BitField<bool, 12, 1> {};
 
   DEFINE_HANDLER_CODE_STUB(StoreGlobal, HandlerStub);
 };
 
 
+class LoadGlobalViaContextStub : public HydrogenCodeStub {
+ public:
+  // Use the loop version for depths higher than this one.
+  static const int kDynamicDepth = 7;
+
+  LoadGlobalViaContextStub(Isolate* isolate, int depth)
+      : HydrogenCodeStub(isolate) {
+    if (depth > kDynamicDepth) depth = kDynamicDepth;
+    set_sub_minor_key(DepthBits::encode(depth));
+  }
+
+  int depth() const { return DepthBits::decode(sub_minor_key()); }
+
+ private:
+  class DepthBits : public BitField<unsigned int, 0, 3> {};
+  STATIC_ASSERT(kDynamicDepth <= DepthBits::kMax);
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(LoadGlobalViaContext);
+  DEFINE_HYDROGEN_CODE_STUB(LoadGlobalViaContext, HydrogenCodeStub);
+};
+
+
+class StoreGlobalViaContextStub : public HydrogenCodeStub {
+ public:
+  // Use the loop version for depths higher than this one.
+  static const int kDynamicDepth = 7;
+
+  StoreGlobalViaContextStub(Isolate* isolate, int depth,
+                            LanguageMode language_mode)
+      : HydrogenCodeStub(isolate) {
+    if (depth > kDynamicDepth) depth = kDynamicDepth;
+    set_sub_minor_key(DepthBits::encode(depth) |
+                      LanguageModeBits::encode(language_mode));
+  }
+
+  int depth() const { return DepthBits::decode(sub_minor_key()); }
+
+  LanguageMode language_mode() const {
+    return LanguageModeBits::decode(sub_minor_key());
+  }
+
+ private:
+  class DepthBits : public BitField<unsigned int, 0, 4> {};
+  STATIC_ASSERT(kDynamicDepth <= DepthBits::kMax);
+
+  class LanguageModeBits : public BitField<LanguageMode, 4, 2> {};
+  STATIC_ASSERT(LANGUAGE_END == 3);
+
+ private:
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(StoreGlobalViaContext);
+  DEFINE_HYDROGEN_CODE_STUB(StoreGlobalViaContext, HydrogenCodeStub);
+};
+
+
 class CallApiFunctionStub : public PlatformCodeStub {
  public:
   explicit CallApiFunctionStub(Isolate* isolate, bool call_data_undefined)
       : PlatformCodeStub(isolate) {
     minor_key_ = CallDataUndefinedBits::encode(call_data_undefined);
   }
 
  private:
   bool call_data_undefined() const {
     return CallDataUndefinedBits::decode(minor_key_);
@@ skipping 1632 matching lines @@
 #undef DEFINE_PLATFORM_CODE_STUB
 #undef DEFINE_HANDLER_CODE_STUB
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_