Win64 - Allow returning two values from a runtime function.

src/x64/macro-assembler-x64.h

 // Copyright 2006-2008 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 88 matching lines @@
   // ---------------------------------------------------------------------------
   // Activation frames
 
   void EnterInternalFrame() { EnterFrame(StackFrame::INTERNAL); }
   void LeaveInternalFrame() { LeaveFrame(StackFrame::INTERNAL); }
 
   void EnterConstructFrame() { EnterFrame(StackFrame::CONSTRUCT); }
   void LeaveConstructFrame() { LeaveFrame(StackFrame::CONSTRUCT); }
 
   // Enter specific kind of exit frame; either EXIT or
-  // EXIT_DEBUG. Expects the number of arguments in register eax and
-  // sets up the number of arguments in register edi and the pointer
-  // to the first argument in register esi.
-  void EnterExitFrame(StackFrame::Type type);
+  // EXIT_DEBUG. Expects the number of arguments in register rax and
+  // sets up the number of arguments in register rdi and the pointer
+  // to the first argument in register rsi.
+  void EnterExitFrame(StackFrame::Type type, int result_size = 1);
 
-  // Leave the current exit frame. Expects the return value in
-  // register eax:edx (untouched) and the pointer to the first
-  // argument in register esi.
-  void LeaveExitFrame(StackFrame::Type type);
+  // Leave the current exit frame. Expects/provides the return value in
+  // register rax:rdx (untouched) and the pointer to the first
+  // argument in register rsi.
+  void LeaveExitFrame(StackFrame::Type type, int result_size = 1);
 
 
   // ---------------------------------------------------------------------------
   // JavaScript invokes
 
   // Invoke the JavaScript function code by either calling or jumping.
   void InvokeCode(Register code,
                   const ParameterCount& expected,
                   const ParameterCount& actual,
                   InvokeFlag flag);
@@ skipping 182 matching lines @@
   // Call a runtime routine.
   // Eventually this should be used for all C calls.
   void CallRuntime(Runtime::Function* f, int num_arguments);
 
   // Convenience function: Same as above, but takes the fid instead.
   void CallRuntime(Runtime::FunctionId id, int num_arguments);
 
   // Tail call of a runtime routine (jump).
   // Like JumpToBuiltin, but also takes care of passing the number
   // of arguments.
-  void TailCallRuntime(const ExternalReference& ext, int num_arguments);
+  void TailCallRuntime(const ExternalReference& ext,
+                       int num_arguments,
+                       int result_size);
 
   // Jump to the builtin routine.
-  void JumpToBuiltin(const ExternalReference& ext);
+  void JumpToBuiltin(const ExternalReference& ext, int result_size);
 
 
   // ---------------------------------------------------------------------------
   // Utilities
 
   void Ret();
 
   struct Unresolved {
     int pc;
     uint32_t flags;  // see Bootstrapper::FixupFlags decoders/encoders.
@@ skipping 119 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_