WIP: Implement ES6 Spread-calls

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 809 matching lines @@
   ExtraICState GetExtraICState() const FINAL {
     return static_cast<ExtraICState>(minor_key_);
   }
 
  protected:
   bool CallAsMethod() const {
     return state().call_type() == CallICState::METHOD;
   }
 
   int arg_count() const { return state().arg_count(); }
+  bool is_spread() const { return state().is_spread(); }
 
   CallICState state() const {
     return CallICState(static_cast<ExtraICState>(minor_key_));
   }
 
   // Code generation helpers.
   void GenerateMiss(MacroAssembler* masm);
 
  private:
   void PrintState(std::ostream& os) const OVERRIDE;  // NOLINT
@@ skipping 805 matching lines @@
   static const int kIndex = 1;
   static const int kInput = 2;
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(RegExpConstructResult);
   DEFINE_HYDROGEN_CODE_STUB(RegExpConstructResult, HydrogenCodeStub);
 };
 
 
 class CallFunctionStub: public PlatformCodeStub {
  public:
-  CallFunctionStub(Isolate* isolate, int argc, CallFunctionFlags flags)
+  CallFunctionStub(Isolate* isolate, int argc, CallFunctionFlags flags,
+                   bool is_spread = false)
       : PlatformCodeStub(isolate) {
     DCHECK(argc >= 0 && argc <= Code::kMaxArguments);
-    minor_key_ = ArgcBits::encode(argc) | FlagBits::encode(flags);
+    minor_key_ = ArgcBits::encode(argc) | FlagBits::encode(flags) |
+                 IsSpreadBits::encode(is_spread);
   }
 
   static int ExtractArgcFromMinorKey(int minor_key) {
     return ArgcBits::decode(minor_key);
   }
 
  private:
   int argc() const { return ArgcBits::decode(minor_key_); }
   int flags() const { return FlagBits::decode(minor_key_); }
 
   bool CallAsMethod() const {
     return flags() == CALL_AS_METHOD || flags() == WRAP_AND_CALL;
   }
 
+  bool is_spread() const { return IsSpreadBits::decode(minor_key_); }
+
   bool NeedsChecks() const { return flags() != WRAP_AND_CALL; }
 
   void PrintName(std::ostream& os) const OVERRIDE;  // NOLINT
 
   // Minor key encoding in 32 bits with Bitfield <Type, shift, size>.
   class FlagBits : public BitField<CallFunctionFlags, 0, 2> {};
-  class ArgcBits : public BitField<unsigned, 2, Code::kArgumentsBits> {};
-  STATIC_ASSERT(Code::kArgumentsBits + 2 <= kStubMinorKeyBits);
+  class IsSpreadBits : public BitField<bool, FlagBits::kNext, 1> {};
+  class ArgcBits : public BitField<unsigned, IsSpreadBits::kNext,
+                                   Code::kArgumentsBits> {};
+
+  STATIC_ASSERT(Code::kArgumentsBits + 3 <= kStubMinorKeyBits);
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(CallFunction);
   DEFINE_PLATFORM_CODE_STUB(CallFunction, PlatformCodeStub);
 };
 
 
 class CallConstructStub: public PlatformCodeStub {
  public:
   CallConstructStub(Isolate* isolate, CallConstructorFlags flags)
       : PlatformCodeStub(isolate) {
@@ skipping 999 matching lines @@
 
 #undef DEFINE_CALL_INTERFACE_DESCRIPTOR
 #undef DEFINE_PLATFORM_CODE_STUB
 #undef DEFINE_HANDLER_CODE_STUB
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_