remove this == null

R=danno@chromium.org

BUG=chromium:381910

Review URL: https://codereview.chromium.org/336483002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21807 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -1192,14 +1192,14 @@ static i::Handle<i::AccessorInfo> MakeAccessorInfo(
 
 
 Local<ObjectTemplate> FunctionTemplate::InstanceTemplate() {
-  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
-  if (!Utils::ApiCheck(this != NULL,
+  i::Handle<i::FunctionTemplateInfo> handle = Utils::OpenHandle(this, true);
+  if (!Utils::ApiCheck(!handle.is_null(),
                        "v8::FunctionTemplate::InstanceTemplate()",
                        "Reading from empty handle")) {
     return Local<ObjectTemplate>();
   }
+  i::Isolate* isolate = handle->GetIsolate();
   ENTER_V8(isolate);
-  i::Handle<i::FunctionTemplateInfo> handle = Utils::OpenHandle(this);
   if (handle->instance_template()->IsUndefined()) {
     Local<ObjectTemplate> templ =
         ObjectTemplate::New(isolate, ToApiHandle<FunctionTemplate>(handle));
@@ -1616,11 +1616,11 @@ Handle<Value> UnboundScript::GetScriptName() {
 
 
 Local<Value> Script::Run() {
+  i::Handle<i::HeapObject> obj =
+      i::Handle<i::HeapObject>::cast(Utils::OpenHandle(this, true));
   // If execution is terminating, Compile(..)->Run() requires this
   // check.
-  if (this == NULL) return Local<Value>();
-  i::Handle<i::HeapObject> obj =
-      i::Handle<i::HeapObject>::cast(Utils::OpenHandle(this));
+  if (obj.is_null()) return Local<Value>();
   i::Isolate* isolate = obj->GetIsolate();
   ON_BAILOUT(isolate, "v8::Script::Run()", return Local<Value>());
   LOG_API(isolate, "Script::Run");
@@ -2912,14 +2912,14 @@ int32_t Value::Int32Value() const {
 
 bool Value::Equals(Handle<Value> that) const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (!Utils::ApiCheck(this != NULL && !that.IsEmpty(),
+  i::Handle<i::Object> obj = Utils::OpenHandle(this, true);
+  if (!Utils::ApiCheck(!obj.is_null() && !that.IsEmpty(),
                        "v8::Value::Equals()",
                        "Reading from empty handle")) {
     return false;
   }
   LOG_API(isolate, "Equals");
   ENTER_V8(isolate);
-  i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> other = Utils::OpenHandle(*that);
   // If both obj and other are JSObjects, we'd better compare by identity
   // immediately when going into JS builtin.  The reason is Invoke
@@ -2939,13 +2939,13 @@ bool Value::Equals(Handle<Value> that) const {
 
 bool Value::StrictEquals(Handle<Value> that) const {
   i::Isolate* isolate = i::Isolate::Current();
-  if (!Utils::ApiCheck(this != NULL && !that.IsEmpty(),
+  i::Handle<i::Object> obj = Utils::OpenHandle(this, true);
+  if (!Utils::ApiCheck(!obj.is_null() && !that.IsEmpty(),
                        "v8::Value::StrictEquals()",
                        "Reading from empty handle")) {
     return false;
   }
   LOG_API(isolate, "StrictEquals");
-  i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> other = Utils::OpenHandle(*that);
   // Must check HeapNumber first, since NaN !== NaN.
   if (obj->IsHeapNumber()) {
@@ -2971,12 +2971,12 @@ bool Value::StrictEquals(Handle<Value> that) const {
 
 
 bool Value::SameValue(Handle<Value> that) const {
-  if (!Utils::ApiCheck(this != NULL && !that.IsEmpty(),
+  i::Handle<i::Object> obj = Utils::OpenHandle(this, true);
+  if (!Utils::ApiCheck(!obj.is_null() && !that.IsEmpty(),
                        "v8::Value::SameValue()",
                        "Reading from empty handle")) {
     return false;
   }
-  i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> other = Utils::OpenHandle(*that);
   return obj->SameValue(*other);
 }

src/factory.cc

@@ -1411,7 +1411,8 @@ Handle<Code> Factory::NewCode(const CodeDesc& desc,
   int obj_size = Code::SizeFor(body_size);
 
   Handle<Code> code = NewCodeRaw(obj_size, immovable);
-  ASSERT(!isolate()->code_range()->exists() ||
+  ASSERT(isolate()->code_range() == NULL ||
+         !isolate()->code_range()->valid() ||
          isolate()->code_range()->contains(code->address()));
 
   // The code object has not been fully initialized yet.  We rely on the

src/heap.cc

@@ -3365,8 +3365,9 @@ AllocationResult Heap::AllocateCode(int object_size,
 
   result->set_map_no_write_barrier(code_map());
   Code* code = Code::cast(result);
-  ASSERT(!isolate_->code_range()->exists() ||
-      isolate_->code_range()->contains(code->address()));
+  ASSERT(isolate_->code_range() == NULL ||
+         !isolate_->code_range()->valid() ||
+         isolate_->code_range()->contains(code->address()));
   code->set_gc_metadata(Smi::FromInt(0));
   code->set_ic_age(global_ic_age_);
   return code;
@@ -3407,8 +3408,9 @@ AllocationResult Heap::CopyCode(Code* code) {
   new_code->set_constant_pool(new_constant_pool);
 
   // Relocate the copy.
-  ASSERT(!isolate_->code_range()->exists() ||
-      isolate_->code_range()->contains(code->address()));
+  ASSERT(isolate_->code_range() == NULL ||
+         !isolate_->code_range()->valid() ||
+         isolate_->code_range()->contains(code->address()));
   new_code->Relocate(new_addr - old_addr);
   return new_code;
 }
@@ -3471,8 +3473,9 @@ AllocationResult Heap::CopyCode(Code* code, Vector<byte> reloc_info) {
             static_cast<size_t>(reloc_info.length()));
 
   // Relocate the copy.
-  ASSERT(!isolate_->code_range()->exists() ||
-      isolate_->code_range()->contains(code->address()));
+  ASSERT(isolate_->code_range() == NULL ||
+         !isolate_->code_range()->valid() ||
+         isolate_->code_range()->contains(code->address()));
   new_code->Relocate(new_addr - old_addr);
 
 #ifdef VERIFY_HEAP

src/hydrogen-load-elimination.cc

@@ -25,11 +25,10 @@ class HFieldApproximation : public ZoneObject {
 
   // Recursively copy the entire linked list of field approximations.
   HFieldApproximation* Copy(Zone* zone) {
-    if (this == NULL) return NULL;
     HFieldApproximation* copy = new(zone) HFieldApproximation();
     copy->object_ = this->object_;
     copy->last_value_ = this->last_value_;
-    copy->next_ = this->next_->Copy(zone);
+    copy->next_ = this->next_ == NULL ? NULL : this->next_->Copy(zone);
     return copy;
   }
 };
@@ -148,7 +147,7 @@ class HLoadEliminationTable : public ZoneObject {
         new(zone) HLoadEliminationTable(zone, aliasing_);
     copy->EnsureFields(fields_.length());
     for (int i = 0; i < fields_.length(); i++) {
-      copy->fields_[i] = fields_[i]->Copy(zone);
+      copy->fields_[i] = fields_[i] == NULL ? NULL : fields_[i]->Copy(zone);
     }
     if (FLAG_trace_load_elimination) {
       TRACE((" copy-to B%d\n", succ->block_id()));

src/spaces.cc

@@ -322,9 +322,12 @@ void MemoryAllocator::FreeMemory(VirtualMemory* reservation,
     size_executable_ -= size;
   }
   // Code which is part of the code-range does not have its own VirtualMemory.
-  ASSERT(!isolate_->code_range()->contains(
-      static_cast<Address>(reservation->address())));
-  ASSERT(executable == NOT_EXECUTABLE || !isolate_->code_range()->exists());
+  ASSERT(isolate_->code_range() == NULL ||
+         !isolate_->code_range()->contains(
+             static_cast<Address>(reservation->address())));
+  ASSERT(executable == NOT_EXECUTABLE ||
+         isolate_->code_range() == NULL ||
+         !isolate_->code_range()->valid());
   reservation->Release();
 }
 
@@ -342,11 +345,14 @@ void MemoryAllocator::FreeMemory(Address base,
     ASSERT(size_executable_ >= size);
     size_executable_ -= size;
   }
-  if (isolate_->code_range()->contains(static_cast<Address>(base))) {
+  if (isolate_->code_range() != NULL &&
+      isolate_->code_range()->contains(static_cast<Address>(base))) {
     ASSERT(executable == EXECUTABLE);
     isolate_->code_range()->FreeRawMemory(base, size);
   } else {
-    ASSERT(executable == NOT_EXECUTABLE || !isolate_->code_range()->exists());
+    ASSERT(executable == NOT_EXECUTABLE ||
+           isolate_->code_range() == NULL ||
+           !isolate_->code_range()->valid());
     bool result = VirtualMemory::ReleaseRegion(base, size);
     USE(result);
     ASSERT(result);
@@ -522,7 +528,8 @@ bool MemoryChunk::CommitArea(size_t requested) {
       }
     } else {
       CodeRange* code_range = heap_->isolate()->code_range();
-      ASSERT(code_range->exists() && IsFlagSet(IS_EXECUTABLE));
+      ASSERT(code_range != NULL && code_range->valid() &&
+             IsFlagSet(IS_EXECUTABLE));
       if (!code_range->CommitRawMemory(start, length)) return false;
     }
 
@@ -538,7 +545,8 @@ bool MemoryChunk::CommitArea(size_t requested) {
       if (!reservation_.Uncommit(start, length)) return false;
     } else {
       CodeRange* code_range = heap_->isolate()->code_range();
-      ASSERT(code_range->exists() && IsFlagSet(IS_EXECUTABLE));
+      ASSERT(code_range != NULL && code_range->valid() &&
+             IsFlagSet(IS_EXECUTABLE));
       if (!code_range->UncommitRawMemory(start, length)) return false;
     }
   }
@@ -628,7 +636,7 @@ MemoryChunk* MemoryAllocator::AllocateChunk(intptr_t reserve_area_size,
                                  OS::CommitPageSize());
     // Allocate executable memory either from code range or from the
     // OS.
-    if (isolate_->code_range()->exists()) {
+    if (isolate_->code_range() != NULL && isolate_->code_range()->valid()) {
       base = isolate_->code_range()->AllocateRawMemory(chunk_size,
                                                        commit_size,
                                                        &chunk_size);
@@ -1050,8 +1058,9 @@ intptr_t PagedSpace::SizeOfFirstPage() {
     case PROPERTY_CELL_SPACE:
       size = 8 * kPointerSize * KB;
       break;
-    case CODE_SPACE:
-      if (heap()->isolate()->code_range()->exists()) {
+    case CODE_SPACE: {
+      CodeRange* code_range = heap()->isolate()->code_range();
+      if (code_range != NULL && code_range->valid()) {
         // When code range exists, code pages are allocated in a special way
         // (from the reserved code range). That part of the code is not yet
         // upgraded to handle small pages.
@@ -1062,6 +1071,7 @@ intptr_t PagedSpace::SizeOfFirstPage() {
             kPointerSize);
       }
       break;
+    }
     default:
       UNREACHABLE();
   }

src/spaces.h

@@ -929,13 +929,13 @@ class CodeRange {
   // manage it.
   void TearDown();
 
-  bool exists() { return this != NULL && code_range_ != NULL; }
+  bool valid() { return code_range_ != NULL; }
   Address start() {
-    if (this == NULL || code_range_ == NULL) return NULL;
+    ASSERT(valid());
     return static_cast<Address>(code_range_->address());
   }
   bool contains(Address address) {
-    if (this == NULL || code_range_ == NULL) return false;
+    if (!valid()) return false;
     Address start = static_cast<Address>(code_range_->address());
     return start <= address && address < start + code_range_->size();
   }

src/x64/assembler-x64-inl.h

@@ -77,7 +77,6 @@ void Assembler::emit_code_target(Handle<Code> target,
 
 void Assembler::emit_runtime_entry(Address entry, RelocInfo::Mode rmode) {
   ASSERT(RelocInfo::IsRuntimeEntry(rmode));
-  ASSERT(isolate()->code_range()->exists());
   RecordRelocInfo(rmode);
   emitl(static_cast<uint32_t>(entry - isolate()->code_range()->start()));
 }
@@ -213,7 +212,6 @@ Handle<Object> Assembler::code_target_object_handle_at(Address pc) {
 
 
 Address Assembler::runtime_entry_at(Address pc) {
-  ASSERT(isolate()->code_range()->exists());
   return Memory::int32_at(pc) + isolate()->code_range()->start();
 }
 

test/cctest/test-spaces.cc

@@ -169,7 +169,7 @@ static void VerifyMemoryChunk(Isolate* isolate,
                                                               commit_area_size,
                                                               executable,
                                                               NULL);
-  size_t alignment = code_range->exists() ?
+  size_t alignment = code_range != NULL && code_range->valid() ?
                      MemoryChunk::kAlignment : OS::CommitPageSize();
   size_t reserved_size = ((executable == EXECUTABLE))
       ? RoundUp(header_size + guard_size + reserve_area_size + guard_size,