Generate the TransitionElementsStub using Crankshaft

src/x64/macro-assembler-x64.cc

 // Copyright 2012 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 3859 matching lines @@
   }
 }
 
 
 void MacroAssembler::AllocateInNewSpace(Register object_size,
                                         Register result,
                                         Register result_end,
                                         Register scratch,
                                         Label* gc_required,
                                         AllocationFlags flags) {
-  ASSERT((flags & (DOUBLE_ALIGNMENT | RESULT_CONTAINS_TOP |
-                   SIZE_IN_WORDS)) == 0);
+  ASSERT((flags & (RESULT_CONTAINS_TOP | SIZE_IN_WORDS)) == 0);
   if (!FLAG_inline_new) {
     if (emit_debug_code()) {
       // Trash the registers to simulate an allocation failure.
       movl(result, Immediate(0x7091));
       movl(result_end, Immediate(0x7191));
       if (scratch.is_valid()) {
         movl(scratch, Immediate(0x7291));
       }
       // object_size is left unchanged by this function.
     }
@@ skipping 13 matching lines @@
   }
   addq(result_end, result);
   j(carry, gc_required);
   Operand limit_operand = ExternalOperand(new_space_allocation_limit);
   cmpq(result_end, limit_operand);
   j(above, gc_required);
 
   // Update allocation top.
   UpdateAllocationTopHelper(result_end, scratch);
 
+  // Align the next allocation. Storing the filler map without checking top is
+  // always safe because the limit of the heap is always aligned.
+  if (((flags & DOUBLE_ALIGNMENT) != 0) && FLAG_debug_code) {
+    testq(result, Immediate(kDoubleAlignmentMask));
+    Check(zero, "Allocation is not double aligned");
+  }
+
   // Tag the result if requested.
   if ((flags & TAG_OBJECT) != 0) {
     addq(result, Immediate(kHeapObjectTag));
   }
 }
 
 
 void MacroAssembler::UndoAllocationInNewSpace(Register object) {
   ExternalReference new_space_allocation_top =
       ExternalReference::new_space_allocation_top_address(isolate());
@@ skipping 674 matching lines @@
        FieldOperand(rcx, JSObject::kElementsOffset));
   j(not_equal, call_runtime);
 
   movq(rcx, FieldOperand(rbx, Map::kPrototypeOffset));
   cmpq(rcx, null_value);
   j(not_equal, &next);
 }
 
 void MacroAssembler::TestJSArrayForAllocationSiteInfo(
     Register receiver_reg,
-    Register scratch_reg,
-    Label* allocation_info_present) {
+    Register scratch_reg) {
   Label no_info_available;
   ExternalReference new_space_start =
       ExternalReference::new_space_start(isolate());
   ExternalReference new_space_allocation_top =
       ExternalReference::new_space_allocation_top_address(isolate());
 
   lea(scratch_reg, Operand(receiver_reg,
       JSArray::kSize + AllocationSiteInfo::kSize - kHeapObjectTag));
   movq(kScratchRegister, new_space_start);
   cmpq(scratch_reg, kScratchRegister);
   j(less, &no_info_available);
   cmpq(scratch_reg, ExternalOperand(new_space_allocation_top));
   j(greater, &no_info_available);
   CompareRoot(MemOperand(scratch_reg, -AllocationSiteInfo::kSize),
               Heap::kAllocationSiteInfoMapRootIndex);
-  j(equal, allocation_info_present);
   bind(&no_info_available);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64