MIPS: Implement inlined object allocation in Crankshaft.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 25754c5e5423946741848142d2b51a1d7c51d18a..a463cd3257e526bc8230d57fc0494526107a8bea 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4243,9 +4243,45 @@ void LCodeGen::DoAllocateObject(LAllocateObject* instr) {
 
   DeferredAllocateObject* deferred = new DeferredAllocateObject(this, instr);
 
-  // TODO(mstarzinger): Implement inlined version instead of jumping to
-  // deferred runtime call.
-  __ jmp(deferred->entry());
+  Register result = ToRegister(instr->result());
+  Register scratch = ToRegister(instr->TempAt(0));
+  Register scratch2 = ToRegister(instr->TempAt(1));
+  Handle<JSFunction> constructor = instr->hydrogen()->constructor();
+  Handle<Map> initial_map(constructor->initial_map());
+  int instance_size = initial_map->instance_size();
+  ASSERT(initial_map->pre_allocated_property_fields() +
+         initial_map->unused_property_fields() -
+         initial_map->inobject_properties() == 0);
+
+  // Allocate memory for the object.  The initial map might change when
+  // the constructor's prototype changes, but instance size and property
+  // counts remain unchanged (if slack tracking finished).
+  ASSERT(!constructor->shared()->IsInobjectSlackTrackingInProgress());
+  __ AllocateInNewSpace(instance_size,
+                        result,
+                        scratch,
+                        scratch2,
+                        deferred->entry(),
+                        TAG_OBJECT);
+
+  // Load the initial map.
+  Register map = scratch;
+  __ LoadHeapObject(map, constructor);
+  __ lw(map, FieldMemOperand(map, JSFunction::kPrototypeOrInitialMapOffset));
+
+  // Initialize map and fields of the newly allocated object.
+  ASSERT(initial_map->instance_type() == JS_OBJECT_TYPE);
+  __ sw(map, FieldMemOperand(result, JSObject::kMapOffset));
+  __ LoadRoot(scratch, Heap::kEmptyFixedArrayRootIndex);
+  __ sw(scratch, FieldMemOperand(result, JSObject::kElementsOffset));
+  __ sw(scratch, FieldMemOperand(result, JSObject::kPropertiesOffset));
+  if (initial_map->inobject_properties() != 0) {
+    __ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
+    for (int i = 0; i < initial_map->inobject_properties(); i++) {
+      int property_offset = JSObject::kHeaderSize + i * kPointerSize;
+      __ sw(scratch, FieldMemOperand(result, property_offset));
+    }
+  }
 
   __ bind(deferred->exit());
 }