Additional work to get array literal allocation tracking working, even with --always-opt

src/arm/lithium-codegen-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 5413 matching lines @@
   __ push(r0);
   CallRuntimeFromDeferred(Runtime::kAllocateInNewSpace, 1, instr);
   __ StoreToSafepointRegisterSlot(r0, result);
 }
 
 
 void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
   Handle<FixedArray> literals(instr->environment()->closure()->literals());
   ElementsKind boilerplate_elements_kind =
       instr->hydrogen()->boilerplate_elements_kind();
+  AllocationSiteMode allocation_site_mode =
+      instr->hydrogen()->allocation_site_mode();
 
   // Deopt if the array literal boilerplate ElementsKind is of a type different
   // than the expected one. The check isn't necessary if the boilerplate has
   // already been converted to TERMINAL_FAST_ELEMENTS_KIND.
   if (CanTransitionToMoreGeneralFastElementsKind(
           boilerplate_elements_kind, true)) {
     __ LoadHeapObject(r1, instr->hydrogen()->boilerplate_object());
     // Load map into r2.
     __ ldr(r2, FieldMemOperand(r1, HeapObject::kMapOffset));
     // Load the map's "bit field 2".
@@ skipping 11 matching lines @@
   // Pass an empty fixed array.
   __ mov(r1, Operand(isolate()->factory()->empty_fixed_array()));
   __ Push(r3, r2, r1);
 
   // Pick the right runtime function or stub to call.
   int length = instr->hydrogen()->length();
   if (instr->hydrogen()->IsCopyOnWrite()) {
     ASSERT(instr->hydrogen()->depth() == 1);
     FastCloneShallowArrayStub::Mode mode =
         FastCloneShallowArrayStub::COPY_ON_WRITE_ELEMENTS;
-    FastCloneShallowArrayStub stub(mode, length);
+    FastCloneShallowArrayStub stub(mode, DONT_TRACK_ALLOCATION_SITE, length);
     CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
   } else if (instr->hydrogen()->depth() > 1) {
     CallRuntime(Runtime::kCreateArrayLiteral, 3, instr);
   } else if (length > FastCloneShallowArrayStub::kMaximumClonedLength) {
     CallRuntime(Runtime::kCreateArrayLiteralShallow, 3, instr);
   } else {
     FastCloneShallowArrayStub::Mode mode =
         boilerplate_elements_kind == FAST_DOUBLE_ELEMENTS
-            ? FastCloneShallowArrayStub::CLONE_DOUBLE_ELEMENTS
-            : FastCloneShallowArrayStub::CLONE_ELEMENTS;
-    FastCloneShallowArrayStub stub(mode, length);
+        ? FastCloneShallowArrayStub::CLONE_DOUBLE_ELEMENTS
+        : FastCloneShallowArrayStub::CLONE_ELEMENTS;
+    FastCloneShallowArrayStub stub(mode, allocation_site_mode, length);
     CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
   }
 }
 
 
 void LCodeGen::EmitDeepCopy(Handle<JSObject> object,
                             Register result,
                             Register source,
-                            int* offset) {
+                            int* offset,
+                            AllocationSiteMode mode) {
   ASSERT(!source.is(r2));
   ASSERT(!result.is(r2));
 
+  bool create_allocation_site_info = mode == TRACK_ALLOCATION_SITE &&
+      object->map()->CanTrackAllocationSite();
+
   // Only elements backing stores for non-COW arrays need to be copied.
   Handle<FixedArrayBase> elements(object->elements());
   bool has_elements = elements->length() > 0 &&
       elements->map() != isolate()->heap()->fixed_cow_array_map();
 
   // Increase the offset so that subsequent objects end up right after
   // this object and its backing store.
   int object_offset = *offset;
   int object_size = object->map()->instance_size();
+  int elements_size = has_elements ? elements->Size() : 0;
   int elements_offset = *offset + object_size;
-  int elements_size = has_elements ? elements->Size() : 0;
+  if (create_allocation_site_info) {
+    elements_offset += AllocationSiteInfo::kSize;
+    *offset += AllocationSiteInfo::kSize;
+  }
+
   *offset += object_size + elements_size;
 
   // Copy object header.
   ASSERT(object->properties()->length() == 0);
   int inobject_properties = object->map()->inobject_properties();
   int header_size = object_size - inobject_properties * kPointerSize;
   for (int i = 0; i < header_size; i += kPointerSize) {
     if (has_elements && i == JSObject::kElementsOffset) {
       __ add(r2, result, Operand(elements_offset));
     } else {
       __ ldr(r2, FieldMemOperand(source, i));
     }
     __ str(r2, FieldMemOperand(result, object_offset + i));
   }
 
   // Copy in-object properties.
   for (int i = 0; i < inobject_properties; i++) {
     int total_offset = object_offset + object->GetInObjectPropertyOffset(i);
     Handle<Object> value = Handle<Object>(object->InObjectPropertyAt(i));
     if (value->IsJSObject()) {
       Handle<JSObject> value_object = Handle<JSObject>::cast(value);
       __ add(r2, result, Operand(*offset));
       __ str(r2, FieldMemOperand(result, total_offset));
       __ LoadHeapObject(source, value_object);
-      EmitDeepCopy(value_object, result, source, offset);
+      EmitDeepCopy(value_object, result, source, offset,
+                   DONT_TRACK_ALLOCATION_SITE);
     } else if (value->IsHeapObject()) {
       __ LoadHeapObject(r2, Handle<HeapObject>::cast(value));
       __ str(r2, FieldMemOperand(result, total_offset));
     } else {
       __ mov(r2, Operand(value));
       __ str(r2, FieldMemOperand(result, total_offset));
     }
   }
 
+  // Build Allocation Site Info if desired
+  if (create_allocation_site_info) {
+    __ mov(r2, Operand(Handle<Map>(isolate()->heap()->
+                                   allocation_site_info_map())));
+    __ str(r2, FieldMemOperand(result, object_size));
+    __ str(source, FieldMemOperand(result, object_size + kPointerSize));
+  }
+
   if (has_elements) {
     // Copy elements backing store header.
     __ LoadHeapObject(source, elements);
     for (int i = 0; i < FixedArray::kHeaderSize; i += kPointerSize) {
       __ ldr(r2, FieldMemOperand(source, i));
       __ str(r2, FieldMemOperand(result, elements_offset + i));
     }
 
     // Copy elements backing store content.
     int elements_length = has_elements ? elements->length() : 0;
@@ skipping 15 matching lines @@
     } else if (elements->IsFixedArray()) {
       Handle<FixedArray> fast_elements = Handle<FixedArray>::cast(elements);
       for (int i = 0; i < elements_length; i++) {
         int total_offset = elements_offset + FixedArray::OffsetOfElementAt(i);
         Handle<Object> value(fast_elements->get(i));
         if (value->IsJSObject()) {
           Handle<JSObject> value_object = Handle<JSObject>::cast(value);
           __ add(r2, result, Operand(*offset));
           __ str(r2, FieldMemOperand(result, total_offset));
           __ LoadHeapObject(source, value_object);
-          EmitDeepCopy(value_object, result, source, offset);
+          EmitDeepCopy(value_object, result, source, offset,
+                       DONT_TRACK_ALLOCATION_SITE);
         } else if (value->IsHeapObject()) {
           __ LoadHeapObject(r2, Handle<HeapObject>::cast(value));
           __ str(r2, FieldMemOperand(result, total_offset));
         } else {
           __ mov(r2, Operand(value));
           __ str(r2, FieldMemOperand(result, total_offset));
         }
       }
     } else {
       UNREACHABLE();
@@ skipping 30 matching lines @@
   __ jmp(&allocated);
 
   __ bind(&runtime_allocate);
   __ mov(r0, Operand(Smi::FromInt(size)));
   __ push(r0);
   CallRuntime(Runtime::kAllocateInNewSpace, 1, instr);
 
   __ bind(&allocated);
   int offset = 0;
   __ LoadHeapObject(r1, instr->hydrogen()->boilerplate());
-  EmitDeepCopy(instr->hydrogen()->boilerplate(), r0, r1, &offset);
+  EmitDeepCopy(instr->hydrogen()->boilerplate(), r0, r1, &offset,
+               instr->hydrogen()->allocation_site_mode());
   ASSERT_EQ(size, offset);
 }
 
 
 void LCodeGen::DoObjectLiteral(LObjectLiteral* instr) {
   Handle<FixedArray> literals(instr->environment()->closure()->literals());
   Handle<FixedArray> constant_properties =
       instr->hydrogen()->constant_properties();
 
   // Set up the parameters to the stub/runtime call.
@@ skipping 453 matching lines @@
   __ sub(scratch, result, Operand(index, LSL, kPointerSizeLog2 - kSmiTagSize));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal