Implement target cache for constructor calls.

src/code-stubs.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 20 matching lines @@
 #include "allocation.h"
 #include "globals.h"
 #include "codegen.h"
 
 namespace v8 {
 namespace internal {
 
 // List of code stubs used on all platforms.
 #define CODE_STUB_LIST_ALL_PLATFORMS(V)  \
   V(CallFunction)                        \
+  V(CallConstruct)                       \
   V(UnaryOp)                             \
   V(BinaryOp)                            \
   V(StringAdd)                           \
   V(SubString)                           \
   V(StringCompare)                       \
   V(Compare)                             \
   V(CompareIC)                           \
   V(MathPow)                             \
   V(RecordWrite)                         \
   V(StoreBufferOverflow)                 \
@@ skipping 673 matching lines @@
   RegExpConstructResultStub() { }
 
  private:
   Major MajorKey() { return RegExpConstructResult; }
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 };
 
 
-class CallFunctionStub: public CodeStub {
+// Base class for call stubs caching call targets in the instruction stream.
+class CallStub: public CodeStub {
  public:
-  CallFunctionStub(int argc, CallFunctionFlags flags)
-      : argc_(argc), flags_(flags) { }
-
-  void Generate(MacroAssembler* masm);
-
-  virtual void FinishCode(Handle<Code> code);
-
   static void Clear(Heap* heap, Address address);
 
   static Object* GetCachedValue(Address address);
 
-  static int ExtractArgcFromMinorKey(int minor_key) {
-    return ArgcBits::decode(minor_key);
+  // Checks whether a call to the given target has a cache attached.
+  static bool HasCache(Code* target) {
+    return target->kind() == Code::STUB &&
+           (target->major_key() == CallFunction ||
+            target->major_key() == CallConstruct) &&
+           target->has_function_cache();
   }
 
   // The object that indicates an uninitialized cache.
   static Handle<Object> UninitializedSentinel(Isolate* isolate) {
     return isolate->factory()->the_hole_value();
   }
 
   // A raw version of the uninitialized sentinel that's safe to read during
   // garbage collection (e.g., for patching the cache).
   static Object* RawUninitializedSentinel(Heap* heap) {
     return heap->raw_unchecked_the_hole_value();
   }
 
   // The object that indicates a megamorphic state.
   static Handle<Object> MegamorphicSentinel(Isolate* isolate) {
     return isolate->factory()->undefined_value();
   }
 
+ protected:
+  void GenerateRecordCallTarget(MacroAssembler* masm);
+};
+
+
+class CallFunctionStub: public CallStub {
+ public:
+  CallFunctionStub(int argc, CallFunctionFlags flags)
+      : argc_(argc), flags_(flags) { }
+
+  void Generate(MacroAssembler* masm);
+
+  virtual void FinishCode(Handle<Code> code);
+
+  static int ExtractArgcFromMinorKey(int minor_key) {
+    return ArgcBits::decode(minor_key);
+  }
+
  private:
   int argc_;
   CallFunctionFlags flags_;
 
   virtual void PrintName(StringStream* stream);
 
   // Minor key encoding in 32 bits with Bitfield <Type, shift, size>.
   class FlagBits: public BitField<CallFunctionFlags, 0, 2> {};
   class ArgcBits: public BitField<unsigned, 2, 32 - 2> {};
 
   Major MajorKey() { return CallFunction; }
   int MinorKey() {
     // Encode the parameters in a unique 32 bit value.
     return FlagBits::encode(flags_) | ArgcBits::encode(argc_);
   }
 
   bool ReceiverMightBeImplicit() {
     return (flags_ & RECEIVER_MIGHT_BE_IMPLICIT) != 0;
   }
 
   bool RecordCallTarget() {
     return (flags_ & RECORD_CALL_TARGET) != 0;
   }
 };
 
 
+class CallConstructStub: public CallStub {
+ public:
+  explicit CallConstructStub(CallFunctionFlags flags) : flags_(flags) {}
+
+  void Generate(MacroAssembler* masm);
+
+  virtual void FinishCode(Handle<Code> code);
+
+ private:
+  CallFunctionFlags flags_;
+
+  Major MajorKey() { return CallConstruct; }
+  int MinorKey() { return flags_; }
+
+  bool RecordCallTarget() {
+    return (flags_ & RECORD_CALL_TARGET) != 0;
+  }
+};
+
+
 enum StringIndexFlags {
   // Accepts smis or heap numbers.
   STRING_INDEX_IS_NUMBER,
 
   // Accepts smis or heap numbers that are valid array indices
   // (ECMA-262 15.4). Invalid indices are reported as being out of
   // range.
   STRING_INDEX_IS_ARRAY_INDEX
 };
 
@@ skipping 306 matching lines @@
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 
   DISALLOW_COPY_AND_ASSIGN(StoreArrayLiteralElementStub);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_