Generate the TransitionElementsStub using Crankshaft

src/ia32/macro-assembler-ia32.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 1368 matching lines @@
   UpdateAllocationTopHelper(result_end, scratch);
 }
 
 
 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.
       mov(result, Immediate(0x7091));
       mov(result_end, Immediate(0x7191));
       if (scratch.is_valid()) {
         mov(scratch, Immediate(0x7291));
       }
       // object_size is left unchanged by this function.
     }
     jmp(gc_required);
     return;
   }
   ASSERT(!result.is(result_end));
 
   // Load address of new object into result.
   LoadAllocationTopHelper(result, scratch, flags);
 
+  // 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) {
+    ASSERT(kPointerAlignment * 2 == kDoubleAlignment);
+    Label aligned;
+    test(result, Immediate(kDoubleAlignmentMask));
+    j(zero, &aligned, Label::kNear);
+    mov(Operand(result, 0),
+        Immediate(isolate()->factory()->one_pointer_filler_map()));
+    add(result, Immediate(kDoubleSize / 2));
+    bind(&aligned);
+  }
+
   // Calculate new top and bail out if new space is exhausted.
   ExternalReference new_space_allocation_limit =
       ExternalReference::new_space_allocation_limit_address(isolate());
   if (!object_size.is(result_end)) {
     mov(result_end, object_size);
   }
   add(result_end, result);
   j(carry, gc_required);
   cmp(result_end, Operand::StaticVariable(new_space_allocation_limit));
   j(above, gc_required);
 
   // Tag result if requested.
   if ((flags & TAG_OBJECT) != 0) {
-    lea(result, Operand(result, kHeapObjectTag));
+    ASSERT(kHeapObjectTag == 1);
+    inc(result);
   }
 
   // Update allocation top.
   UpdateAllocationTopHelper(result_end, scratch);
 }
 
 
 void MacroAssembler::UndoAllocationInNewSpace(Register object) {
   ExternalReference new_space_allocation_top =
       ExternalReference::new_space_allocation_top_address(isolate());
@@ skipping 1612 matching lines @@
   j(not_equal, call_runtime);
 
   mov(ecx, FieldOperand(ebx, Map::kPrototypeOffset));
   cmp(ecx, isolate()->factory()->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));
   cmp(scratch_reg, Immediate(new_space_start));
   j(less, &no_info_available);
   cmp(scratch_reg, Operand::StaticVariable(new_space_allocation_top));
   j(greater, &no_info_available);
   cmp(MemOperand(scratch_reg, -AllocationSiteInfo::kSize),
       Immediate(Handle<Map>(isolate()->heap()->allocation_site_info_map())));
-  j(equal, allocation_info_present);
   bind(&no_info_available);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32