Implement tracking and optimizations of packed arrays

src/arm/builtins-arm.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 96 matching lines @@
 // and filled with the hole values.
 static void AllocateEmptyJSArray(MacroAssembler* masm,
                                  Register array_function,
                                  Register result,
                                  Register scratch1,
                                  Register scratch2,
                                  Register scratch3,
                                  Label* gc_required) {
   const int initial_capacity = JSArray::kPreallocatedArrayElements;
   STATIC_ASSERT(initial_capacity >= 0);
-  __ LoadInitialArrayMap(array_function, scratch2, scratch1);
+  __ LoadInitialArrayMap(array_function, scratch2, scratch1, false);
 
   // Allocate the JSArray object together with space for a fixed array with the
   // requested elements.
   int size = JSArray::kSize;
   if (initial_capacity > 0) {
     size += FixedArray::SizeFor(initial_capacity);
   }
   __ AllocateInNewSpace(size,
                         result,
                         scratch2,
@@ skipping 73 matching lines @@
                             Register array_function,  // Array function.
                             Register array_size,  // As a smi, cannot be 0.
                             Register result,
                             Register elements_array_storage,
                             Register elements_array_end,
                             Register scratch1,
                             Register scratch2,
                             bool fill_with_hole,
                             Label* gc_required) {
   // Load the initial map from the array function.
-  __ LoadInitialArrayMap(array_function, scratch2, elements_array_storage);
+  __ LoadInitialArrayMap(array_function, scratch2,
+                         elements_array_storage, fill_with_hole);
 
   if (FLAG_debug_code) {  // Assert that array size is not zero.
     __ tst(array_size, array_size);
     __ Assert(ne, "array size is unexpectedly 0");
   }
 
   // Allocate the JSArray object together with space for a FixedArray with the
   // requested number of elements.
   STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
   __ mov(elements_array_end,
@@ skipping 211 matching lines @@
 
   __ bind(&has_non_smi_element);
   // Double values are handled by the runtime.
   __ CheckMap(
       r2, r9, Heap::kHeapNumberMapRootIndex, &not_double, DONT_DO_SMI_CHECK);
   __ bind(&cant_transition_map);
   __ UndoAllocationInNewSpace(r3, r4);
   __ b(call_generic_code);
 
   __ bind(&not_double);
-  // Transition FAST_SMI_ONLY_ELEMENTS to FAST_ELEMENTS.
+  // Transition FAST_SMI_ELEMENTS to FAST_ELEMENTS.
   // r3: JSArray
   __ ldr(r2, FieldMemOperand(r3, HeapObject::kMapOffset));
-  __ LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
+  __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS,
                                          FAST_ELEMENTS,
                                          r2,
                                          r9,
                                          &cant_transition_map);
   __ str(r2, FieldMemOperand(r3, HeapObject::kMapOffset));
   __ RecordWriteField(r3,
                       HeapObject::kMapOffset,
                       r2,
                       r9,
                       kLRHasNotBeenSaved,
@@ skipping 1302 matching lines @@
   __ bind(&dont_adapt_arguments);
   __ Jump(r3);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM