Add Smi::Zero and replace all Smi::FromInt(0) calls

src/heap/heap-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_HEAP_INL_H_
 #define V8_HEAP_HEAP_INL_H_
 
 #include <cmath>
 
 #include "src/base/platform/platform.h"
@@ skipping 724 matching lines @@
 
 void Heap::ExternalStringTable::ShrinkNewStrings(int position) {
   new_space_strings_.Rewind(position);
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) {
     Verify();
   }
 #endif
 }
 
-void Heap::ClearInstanceofCache() {
-  set_instanceof_cache_function(Smi::FromInt(0));
-}
+void Heap::ClearInstanceofCache() { set_instanceof_cache_function(Smi::kZero); }
 
 Oddball* Heap::ToBoolean(bool condition) {
   return condition ? true_value() : false_value();
 }
 
 
 void Heap::CompletelyClearInstanceofCache() {
-  set_instanceof_cache_map(Smi::FromInt(0));
-  set_instanceof_cache_function(Smi::FromInt(0));
+  set_instanceof_cache_map(Smi::kZero);
+  set_instanceof_cache_function(Smi::kZero);
 }
 
 
 uint32_t Heap::HashSeed() {
   uint32_t seed = static_cast<uint32_t>(hash_seed()->value());
   DCHECK(FLAG_randomize_hashes || seed == 0);
   return seed;
 }
 
 
 int Heap::NextScriptId() {
   int last_id = last_script_id()->value();
   if (last_id == Smi::kMaxValue) {
     last_id = 1;
   } else {
     last_id++;
   }
   set_last_script_id(Smi::FromInt(last_id));
   return last_id;
 }
 
 void Heap::SetArgumentsAdaptorDeoptPCOffset(int pc_offset) {
-  DCHECK(arguments_adaptor_deopt_pc_offset() == Smi::FromInt(0));
+  DCHECK(arguments_adaptor_deopt_pc_offset() == Smi::kZero);
   set_arguments_adaptor_deopt_pc_offset(Smi::FromInt(pc_offset));
 }
 
 void Heap::SetConstructStubDeoptPCOffset(int pc_offset) {
-  DCHECK(construct_stub_deopt_pc_offset() == Smi::FromInt(0));
+  DCHECK(construct_stub_deopt_pc_offset() == Smi::kZero);
   set_construct_stub_deopt_pc_offset(Smi::FromInt(pc_offset));
 }
 
 void Heap::SetGetterStubDeoptPCOffset(int pc_offset) {
-  DCHECK(getter_stub_deopt_pc_offset() == Smi::FromInt(0));
+  DCHECK(getter_stub_deopt_pc_offset() == Smi::kZero);
   set_getter_stub_deopt_pc_offset(Smi::FromInt(pc_offset));
 }
 
 void Heap::SetSetterStubDeoptPCOffset(int pc_offset) {
-  DCHECK(setter_stub_deopt_pc_offset() == Smi::FromInt(0));
+  DCHECK(setter_stub_deopt_pc_offset() == Smi::kZero);
   set_setter_stub_deopt_pc_offset(Smi::FromInt(pc_offset));
 }
 
 void Heap::SetInterpreterEntryReturnPCOffset(int pc_offset) {
-  DCHECK(interpreter_entry_return_pc_offset() == Smi::FromInt(0));
+  DCHECK(interpreter_entry_return_pc_offset() == Smi::kZero);
   set_interpreter_entry_return_pc_offset(Smi::FromInt(pc_offset));
 }
 
 int Heap::GetNextTemplateSerialNumber() {
   int next_serial_number = next_template_serial_number()->value() + 1;
   set_next_template_serial_number(Smi::FromInt(next_serial_number));
   return next_serial_number;
 }
 
 void Heap::SetSerializedTemplates(FixedArray* templates) {
@@ skipping 25 matching lines @@
 
 void VerifySmisVisitor::VisitPointers(Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {
     CHECK((*current)->IsSmi());
   }
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_INL_H_