Port inline swapping of elements for the sort function in array.js...

src/x64/macro-assembler-x64.cc

 // Copyright 2009 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 57 matching lines @@
 
 void MacroAssembler::StackLimitCheck(Label* on_stack_overflow) {
   CompareRoot(rsp, Heap::kStackLimitRootIndex);
   j(below, on_stack_overflow);
 }
 
 
 void MacroAssembler::RecordWriteHelper(Register object,
                                        Register addr,
                                        Register scratch) {
+  if (FLAG_debug_code) {
+    // Check that the object is not in new space.
+    Label not_in_new_space;
+    InNewSpace(object, scratch, not_equal, &not_in_new_space);
+    Abort("new-space object passed to RecordWriteHelper");
+    bind(&not_in_new_space);
+  }
+
   Label fast;
 
   // Compute the page start address from the heap object pointer, and reuse
   // the 'object' register for it.
   ASSERT(is_int32(~Page::kPageAlignmentMask));
   and_(object,
        Immediate(static_cast<int32_t>(~Page::kPageAlignmentMask)));
   Register page_start = object;
 
   // Compute the bit addr in the remembered set/index of the pointer in the
@@ skipping 62 matching lines @@
                                  int offset,
                                  Register value,
                                  Register smi_index) {
   // The compiled code assumes that record write doesn't change the
   // context register, so we check that none of the clobbered
   // registers are rsi.
   ASSERT(!object.is(rsi) && !value.is(rsi) && !smi_index.is(rsi));
 
   // First, check if a remembered set write is even needed. The tests below
   // catch stores of Smis and stores into young gen (which does not have space
-  // for the remembered set bits.
+  // for the remembered set bits).
   Label done;
   JumpIfSmi(value, &done);
 
   RecordWriteNonSmi(object, offset, value, smi_index);
   bind(&done);
 
   // Clobber all input registers when running with the debug-code flag
   // turned on to provoke errors. This clobbering repeats the
   // clobbering done inside RecordWriteNonSmi but it's necessary to
   // avoid having the fast case for smis leave the registers
@@ skipping 2501 matching lines @@
 CodePatcher::~CodePatcher() {
   // Indicate that code has changed.
   CPU::FlushICache(address_, size_);
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 } }  // namespace v8::internal