Version 3.1.3....

src/x64/codegen-x64.cc

 // Copyright 2010 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 2975 matching lines @@
 
   // Add a label for checking the size of the code used for returning.
 #ifdef DEBUG
   Label check_exit_codesize;
   masm_->bind(&check_exit_codesize);
 #endif
 
   // Leave the frame and return popping the arguments and the
   // receiver.
   frame_->Exit();
-  masm_->ret((scope()->num_parameters() + 1) * kPointerSize);
+  int arguments_bytes = (scope()->num_parameters() + 1) * kPointerSize;
+  __ Ret(arguments_bytes, rcx);
   DeleteFrame();
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Add padding that will be overwritten by a debugger breakpoint.
-  // frame_->Exit() generates "movq rsp, rbp; pop rbp; ret k"
+  // The shortest return sequence generated is "movq rsp, rbp; pop rbp; ret k"
   // with length 7 (3 + 1 + 3).
   const int kPadding = Assembler::kJSReturnSequenceLength - 7;
   for (int i = 0; i < kPadding; ++i) {
     masm_->int3();
   }
-  // Check that the size of the code used for returning matches what is
-  // expected by the debugger.
-  ASSERT_EQ(Assembler::kJSReturnSequenceLength,
-            masm_->SizeOfCodeGeneratedSince(&check_exit_codesize));
+  // Check that the size of the code used for returning is large enough
+  // for the debugger's requirements.
+  ASSERT(Assembler::kJSReturnSequenceLength <=
+         masm_->SizeOfCodeGeneratedSince(&check_exit_codesize));
 #endif
 }
 
 
 void CodeGenerator::VisitWithEnterStatement(WithEnterStatement* node) {
   ASSERT(!in_spilled_code());
   Comment cmnt(masm_, "[ WithEnterStatement");
   CodeForStatementPosition(node);
   Load(node->expression());
   Result context;
@@ skipping 5787 matching lines @@
 }
 
 #endif
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64