remove this == null

src/spaces.h

 // Copyright 2011 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_SPACES_H_
 #define V8_SPACES_H_
 
 #include "src/allocation.h"
 #include "src/base/atomicops.h"
 #include "src/hashmap.h"
@@ skipping 911 matching lines @@
 
   // Reserves a range of virtual memory, but does not commit any of it.
   // Can only be called once, at heap initialization time.
   // Returns false on failure.
   bool SetUp(size_t requested_size);
 
   // Frees the range of virtual memory, and frees the data structures used to
   // 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();
   }
 
   // Allocates a chunk of memory from the large-object portion of
   // the code range.  On platforms with no separate code range, should
   // not be called.
   MUST_USE_RESULT Address AllocateRawMemory(const size_t requested_size,
                                             const size_t commit_size,
                                             size_t* allocated);
@@ skipping 2051 matching lines @@
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_