Hide heap methods where possible.

src/heap.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_H_
 #define V8_HEAP_H_
 
 #include <cmath>
 
 #include "allocation.h"
@@ skipping 664 matching lines @@
     return old_pointer_space_->allocation_limit_address();
   }
 
   Address* OldDataSpaceAllocationTopAddress() {
     return old_data_space_->allocation_top_address();
   }
   Address* OldDataSpaceAllocationLimitAddress() {
     return old_data_space_->allocation_limit_address();
   }
 
-  // Allocates and initializes a new JavaScript object based on a
-  // constructor.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // If allocation_site is non-null, then a memento is emitted after the object
-  // that points to the site.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateJSObject(
-      JSFunction* constructor,
-      PretenureFlag pretenure = NOT_TENURED,
-      AllocationSite* allocation_site = NULL);
-
   // Returns a deep copy of the JavaScript object.
   // Properties and elements are copied too.
   // Returns failure if allocation failed.
   // Optionally takes an AllocationSite to be appended in an AllocationMemento.
   MUST_USE_RESULT MaybeObject* CopyJSObject(JSObject* source,
                                             AllocationSite* site = NULL);
 
-  // Allocates and initializes a new JavaScript object based on a map.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Passing an allocation site means that a memento will be created that
-  // points to the site.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateJSObjectFromMap(
-      Map* map,
-      PretenureFlag pretenure = NOT_TENURED,
-      bool alloc_props = true,
-      AllocationSite* allocation_site = NULL);
-
-  // Allocates a heap object based on the map.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* Allocate(Map* map, AllocationSpace space,
-                                        AllocationSite* allocation_site = NULL);
-
-  // Allocates a JS Map in the heap.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateMap(
-      InstanceType instance_type,
-      int instance_size,
-      ElementsKind elements_kind = TERMINAL_FAST_ELEMENTS_KIND);
-
-  // Allocates a partial map for bootstrapping.
-  MUST_USE_RESULT MaybeObject* AllocatePartialMap(InstanceType instance_type,
-                                                  int instance_size);
-
-  // Allocate a block of memory in the given space (filled with a filler).
-  // Used as a fall-back for generated code when the space is full.
-  MUST_USE_RESULT MaybeObject* AllocateFillerObject(int size,
-                                                    bool double_align,
-                                                    AllocationSpace space);
-
   // Clear the Instanceof cache (used when a prototype changes).
   inline void ClearInstanceofCache();
 
   // Iterates the whole code space to clear all ICs of the given kind.
   void ClearAllICsByKind(Code::Kind kind);
 
   // For use during bootup.
   void RepairFreeListsAfterBoot();
 
-  // Allocates and fully initializes a String.  There are two String
-  // encodings: ASCII and two byte. One should choose between the three string
-  // allocation functions based on the encoding of the string buffer used to
-  // initialized the string.
-  //   - ...FromAscii initializes the string from a buffer that is ASCII
-  //     encoded (it does not check that the buffer is ASCII encoded) and the
-  //     result will be ASCII encoded.
-  //   - ...FromUTF8 initializes the string from a buffer that is UTF-8
-  //     encoded.  If the characters are all single-byte characters, the
-  //     result will be ASCII encoded, otherwise it will converted to two
-  //     byte.
-  //   - ...FromTwoByte initializes the string from a buffer that is two-byte
-  //     encoded.  If the characters are all single-byte characters, the
-  //     result will be converted to ASCII, otherwise it will be left as
-  //     two-byte.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateStringFromUtf8Slow(
-      Vector<const char> str,
-      int non_ascii_start,
-      PretenureFlag pretenure = NOT_TENURED);
-  MUST_USE_RESULT MaybeObject* AllocateStringFromTwoByte(
-      Vector<const uc16> str,
-      PretenureFlag pretenure = NOT_TENURED);
-
   // Allocates an internalized string in old space based on the character
   // stream. Returns Failure::RetryAfterGC(requested_bytes, space) if the
   // allocation failed.
   // Please note this function does not perform a garbage collection.
   MUST_USE_RESULT inline MaybeObject* AllocateInternalizedStringFromUtf8(
       Vector<const char> str,
       int chars,
       uint32_t hash_field);
 
   MUST_USE_RESULT inline MaybeObject* AllocateOneByteInternalizedString(
         Vector<const uint8_t> str,
         uint32_t hash_field);
 
   MUST_USE_RESULT inline MaybeObject* AllocateTwoByteInternalizedString(
         Vector<const uc16> str,
         uint32_t hash_field);
 
   template<typename T>
   static inline bool IsOneByte(T t, int chars);
 
   template<typename T>
   MUST_USE_RESULT inline MaybeObject* AllocateInternalizedStringImpl(
       T t, int chars, uint32_t hash_field);
 
-  template<bool is_one_byte, typename T>
-  MUST_USE_RESULT MaybeObject* AllocateInternalizedStringImpl(
-      T t, int chars, uint32_t hash_field);
-
-  // Allocate a byte array of the specified length
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateByteArray(
-      int length,
-      PretenureFlag pretenure = NOT_TENURED);
-
-  // Allocates an external array of the specified length and type.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateExternalArray(
-      int length,
-      ExternalArrayType array_type,
-      void* external_pointer,
-      PretenureFlag pretenure);
-
-  // Allocates a fixed typed array of the specified length and type.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateFixedTypedArray(
-      int length,
-      ExternalArrayType array_type,
-      PretenureFlag pretenure);
-
-  // Allocate a symbol in old space.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateSymbol();
-  MUST_USE_RESULT MaybeObject* AllocatePrivateSymbol();
-
   // Allocates a fixed array initialized with undefined values
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
   MUST_USE_RESULT MaybeObject* AllocateFixedArray(
       int length,
       PretenureFlag pretenure = NOT_TENURED);
 
   // Allocates an uninitialized fixed array. It must be filled by the caller.
   //
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
   MUST_USE_RESULT MaybeObject* AllocateUninitializedFixedArray(int length);
 
   // Move len elements within a given array from src_index index to dst_index
   // index.
   void MoveElements(FixedArray* array, int dst_index, int src_index, int len);
 
   // Make a copy of src and return it. Returns
   // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
   MUST_USE_RESULT inline MaybeObject* CopyFixedArray(FixedArray* src);
 
-  // Make a copy of src and return it. Returns
-  // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
-  MUST_USE_RESULT MaybeObject* CopyAndTenureFixedCOWArray(FixedArray* src);
-
   // Make a copy of src, set the map, and return the copy. Returns
   // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
   MUST_USE_RESULT MaybeObject* CopyFixedArrayWithMap(FixedArray* src, Map* map);
 
   // Make a copy of src and return it. Returns
   // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
   MUST_USE_RESULT inline MaybeObject* CopyFixedDoubleArray(
       FixedDoubleArray* src);
 
-  // Make a copy of src, set the map, and return the copy. Returns
-  // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
-  MUST_USE_RESULT MaybeObject* CopyFixedDoubleArrayWithMap(
-      FixedDoubleArray* src, Map* map);
-
   // Make a copy of src and return it. Returns
   // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
   MUST_USE_RESULT inline MaybeObject* CopyConstantPoolArray(
       ConstantPoolArray* src);
 
-  // Make a copy of src, set the map, and return the copy. Returns
-  // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
-  MUST_USE_RESULT MaybeObject* CopyConstantPoolArrayWithMap(
-      ConstantPoolArray* src, Map* map);
-
-  MUST_USE_RESULT MaybeObject* AllocateConstantPoolArray(
-      int number_of_int64_entries,
-      int number_of_code_ptr_entries,
-      int number_of_heap_ptr_entries,
-      int number_of_int32_entries);
-
-  // Allocates a fixed double array with uninitialized values. Returns
-  // Failure::RetryAfterGC(requested_bytes, space) if the allocation failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateUninitializedFixedDoubleArray(
-      int length,
-      PretenureFlag pretenure = NOT_TENURED);
-
   // AllocateHashTable is identical to AllocateFixedArray except
   // that the resulting object has hash_table_map as map.
   MUST_USE_RESULT MaybeObject* AllocateHashTable(
       int length, PretenureFlag pretenure = NOT_TENURED);
 
-  // Allocates a new utility object in the old generation.
-  MUST_USE_RESULT MaybeObject* AllocateStruct(InstanceType type);
-
   // Sloppy mode arguments object size.
   static const int kSloppyArgumentsObjectSize =
       JSObject::kHeaderSize + 2 * kPointerSize;
   // Strict mode arguments has no callee so it is smaller.
   static const int kStrictArgumentsObjectSize =
       JSObject::kHeaderSize + 1 * kPointerSize;
   // Indicies for direct access into argument objects.
   static const int kArgumentsLengthIndex = 0;
   // callee is only valid in sloppy mode.
   static const int kArgumentsCalleeIndex = 1;
 
-  // Allocates an arguments object - optionally with an elements array.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateArgumentsObject(
-      Object* callee, int length);
-
-  // Allocated a HeapNumber from value.
-  MUST_USE_RESULT MaybeObject* AllocateHeapNumber(
-      double value, PretenureFlag pretenure = NOT_TENURED);
-
   // Converts an int into either a Smi or a HeapNumber object.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
   MUST_USE_RESULT inline MaybeObject* NumberFromUint32(
       uint32_t value, PretenureFlag pretenure = NOT_TENURED);
 
-  // Allocates a new foreign object.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateForeign(
-      Address address, PretenureFlag pretenure = NOT_TENURED);
-
   // Finalizes an external string by deleting the associated external
   // data and clearing the resource pointer.
   inline void FinalizeExternalString(String* string);
 
   // Initialize a filler object to keep the ability to iterate over the heap
   // when shortening objects.
   void CreateFillerObjectAt(Address addr, int size);
 
   bool CanMoveObjectStart(HeapObject* object);
 
   enum InvocationMode { FROM_GC, FROM_MUTATOR };
 
   // Maintain marking consistency for IncrementalMarking.
   void AdjustLiveBytes(Address address, int by, InvocationMode mode);
 
-  MUST_USE_RESULT MaybeObject* AllocateCode(int object_size, bool immovable);
-
-  MUST_USE_RESULT MaybeObject* CopyCode(Code* code);
-
-  // Copy the code and scope info part of the code object, but insert
-  // the provided data as the relocation information.
-  MUST_USE_RESULT MaybeObject* CopyCode(Code* code, Vector<byte> reloc_info);
-
-  // Finds the internalized copy for string in the string table.
-  // If not found, a new string is added to the table and returned.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if allocation
-  // failed.
-  // Please note this function does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* InternalizeStringWithKey(HashTableKey* key);
-
   bool InternalizeStringIfExists(String* str, String** result);
   bool InternalizeTwoCharsStringIfExists(String* str, String** result);
 
   // Converts the given boolean condition to JavaScript boolean value.
   inline Object* ToBoolean(bool condition);
 
   // Performs garbage collection operation.
   // Returns whether there is a chance that another major GC could
   // collect more garbage.
   inline bool CollectGarbage(
@@ skipping 679 matching lines @@
 
   void InitializeWeakObjectToCodeTable() {
     set_weak_object_to_code_table(undefined_value());
   }
 
   void EnsureWeakObjectToCodeTable();
 
   static void FatalProcessOutOfMemory(const char* location,
                                       bool take_snapshot = false);
 
+ protected:
+  // Methods made available to tests.
+
+  // Allocates a JS Map in the heap.
+  MUST_USE_RESULT MaybeObject* AllocateMap(
+      InstanceType instance_type,
+      int instance_size,
+      ElementsKind elements_kind = TERMINAL_FAST_ELEMENTS_KIND);
+
+  // Allocates and initializes a new JavaScript object based on a
+  // constructor.
+  // If allocation_site is non-null, then a memento is emitted after the object
+  // that points to the site.
+  MUST_USE_RESULT MaybeObject* AllocateJSObject(
+      JSFunction* constructor,
+      PretenureFlag pretenure = NOT_TENURED,
+      AllocationSite* allocation_site = NULL);
+
+  // Allocates and initializes a new JavaScript object based on a map.
+  // Passing an allocation site means that a memento will be created that
+  // points to the site.
+  MUST_USE_RESULT MaybeObject* AllocateJSObjectFromMap(
+      Map* map,
+      PretenureFlag pretenure = NOT_TENURED,
+      bool alloc_props = true,
+      AllocationSite* allocation_site = NULL);
+
+  // Allocated a HeapNumber from value.
+  MUST_USE_RESULT MaybeObject* AllocateHeapNumber(
+      double value, PretenureFlag pretenure = NOT_TENURED);
+
+  // Allocate a byte array of the specified length
+  MUST_USE_RESULT MaybeObject* AllocateByteArray(
+      int length,
+      PretenureFlag pretenure = NOT_TENURED);
+
+  // Allocates an arguments object - optionally with an elements array.
+  MUST_USE_RESULT MaybeObject* AllocateArgumentsObject(
+      Object* callee, int length);
+
+  // Copy the code and scope info part of the code object, but insert
+  // the provided data as the relocation information.
+  MUST_USE_RESULT MaybeObject* CopyCode(Code* code, Vector<byte> reloc_info);
+
+  MUST_USE_RESULT MaybeObject* CopyCode(Code* code);
+
  private:
   Heap();
 
   // This can be calculated directly from a pointer to the heap; however, it is
   // more expedient to get at the isolate directly from within Heap methods.
   Isolate* isolate_;
 
   Object* roots_[kRootListLength];
 
   intptr_t code_range_size_;
@@ skipping 236 matching lines @@
   }
 
   // Allocate an uninitialized object.  The memory is non-executable if the
   // hardware and OS allow.  This is the single choke-point for allocations
   // performed by the runtime and should not be bypassed (to extend this to
   // inlined allocations, use the Heap::DisableInlineAllocation() support).
   MUST_USE_RESULT inline MaybeObject* AllocateRaw(int size_in_bytes,
                                                   AllocationSpace space,
                                                   AllocationSpace retry_space);
 
+  // Allocates a heap object based on the map.
+  MUST_USE_RESULT MaybeObject* Allocate(Map* map, AllocationSpace space,
+                                        AllocationSite* allocation_site = NULL);
+
+  // Allocates a partial map for bootstrapping.
+  MUST_USE_RESULT MaybeObject* AllocatePartialMap(InstanceType instance_type,
+                                                  int instance_size);
+
+  // Initializes a JSObject based on its map.
+  void InitializeJSObjectFromMap(JSObject* obj,
+                                 FixedArray* properties,
+                                 Map* map);
+  void InitializeAllocationMemento(AllocationMemento* memento,
+                                   AllocationSite* allocation_site);
+
+  // Allocate a block of memory in the given space (filled with a filler).
+  // Used as a fall-back for generated code when the space is full.
+  MUST_USE_RESULT MaybeObject* AllocateFillerObject(int size,
+                                                    bool double_align,
+                                                    AllocationSpace space);
+
   // Allocate an uninitialized fixed array.
   MUST_USE_RESULT MaybeObject* AllocateRawFixedArray(
       int length, PretenureFlag pretenure);
 
   // Allocate an uninitialized fixed double array.
   MUST_USE_RESULT MaybeObject* AllocateRawFixedDoubleArray(
       int length, PretenureFlag pretenure);
 
   // Allocate an initialized fixed array with the given filler value.
   MUST_USE_RESULT MaybeObject* AllocateFixedArrayWithFiller(
       int length, PretenureFlag pretenure, Object* filler);
 
   // Allocate and partially initializes a String.  There are two String
   // encodings: ASCII and two byte.  These functions allocate a string of the
   // given length and set its map and length fields.  The characters of the
   // string are uninitialized.
   MUST_USE_RESULT MaybeObject* AllocateRawOneByteString(
       int length, PretenureFlag pretenure);
   MUST_USE_RESULT MaybeObject* AllocateRawTwoByteString(
       int length, PretenureFlag pretenure);
 
-  // Initializes a JSObject based on its map.
-  void InitializeJSObjectFromMap(JSObject* obj,
-                                 FixedArray* properties,
-                                 Map* map);
-  void InitializeAllocationMemento(AllocationMemento* memento,
-                                   AllocationSite* allocation_site);
+  // Allocates and fully initializes a String.  There are two String
+  // encodings: ASCII and two byte. One should choose between the three string
+  // allocation functions based on the encoding of the string buffer used to
+  // initialized the string.
+  //   - ...FromAscii initializes the string from a buffer that is ASCII
+  //     encoded (it does not check that the buffer is ASCII encoded) and the
+  //     result will be ASCII encoded.
+  //   - ...FromUTF8 initializes the string from a buffer that is UTF-8
+  //     encoded.  If the characters are all single-byte characters, the
+  //     result will be ASCII encoded, otherwise it will converted to two
+  //     byte.
+  //   - ...FromTwoByte initializes the string from a buffer that is two-byte
+  //     encoded.  If the characters are all single-byte characters, the
+  //     result will be converted to ASCII, otherwise it will be left as
+  //     two-byte.
+  MUST_USE_RESULT MaybeObject* AllocateStringFromUtf8Slow(
+      Vector<const char> str,
+      int non_ascii_start,
+      PretenureFlag pretenure = NOT_TENURED);
+  MUST_USE_RESULT MaybeObject* AllocateStringFromTwoByte(
+      Vector<const uc16> str,
+      PretenureFlag pretenure = NOT_TENURED);
 
   bool CreateInitialMaps();
   void CreateInitialObjects();
 
+  template<bool is_one_byte, typename T>
+  MUST_USE_RESULT MaybeObject* AllocateInternalizedStringImpl(
+      T t, int chars, uint32_t hash_field);
+
+  // Computes a single character string where the character has code.
+  // A cache is used for ASCII codes.
+  MUST_USE_RESULT MaybeObject* LookupSingleCharacterStringFromCode(
+      uint16_t code);
+
+  // Allocate a symbol in old space.
+  MUST_USE_RESULT MaybeObject* AllocateSymbol();
+
+  // Make a copy of src, set the map, and return the copy.
+  MUST_USE_RESULT MaybeObject* CopyConstantPoolArrayWithMap(
+      ConstantPoolArray* src, Map* map);
+
+  MUST_USE_RESULT MaybeObject* AllocateConstantPoolArray(
+      int number_of_int64_entries,
+      int number_of_code_ptr_entries,
+      int number_of_heap_ptr_entries,
+      int number_of_int32_entries);
+
+  // Allocates an external array of the specified length and type.
+  MUST_USE_RESULT MaybeObject* AllocateExternalArray(
+      int length,
+      ExternalArrayType array_type,
+      void* external_pointer,
+      PretenureFlag pretenure);
+
+  // Allocates a fixed typed array of the specified length and type.
+  MUST_USE_RESULT MaybeObject* AllocateFixedTypedArray(
+      int length,
+      ExternalArrayType array_type,
+      PretenureFlag pretenure);
+
+  // Make a copy of src and return it.
+  MUST_USE_RESULT MaybeObject* CopyAndTenureFixedCOWArray(FixedArray* src);
+
+  // Make a copy of src, set the map, and return the copy.
+  MUST_USE_RESULT MaybeObject* CopyFixedDoubleArrayWithMap(
+      FixedDoubleArray* src, Map* map);
+
+  // Allocates a fixed double array with uninitialized values. Returns
+  MUST_USE_RESULT MaybeObject* AllocateUninitializedFixedDoubleArray(
+      int length,
+      PretenureFlag pretenure = NOT_TENURED);
+
   // These five Create*EntryStub functions are here and forced to not be inlined
   // because of a gcc-4.4 bug that assigns wrong vtable entries.
   NO_INLINE(void CreateJSEntryStub());
   NO_INLINE(void CreateJSConstructEntryStub());
 
   void CreateFixedStubs();
 
   // Allocate empty fixed array.
   MUST_USE_RESULT MaybeObject* AllocateEmptyFixedArray();
 
   // Allocate empty external array of given type.
   MUST_USE_RESULT MaybeObject* AllocateEmptyExternalArray(
       ExternalArrayType array_type);
 
   // Allocate empty fixed typed array of given type.
   MUST_USE_RESULT MaybeObject* AllocateEmptyFixedTypedArray(
       ExternalArrayType array_type);
 
   // Allocate empty constant pool array.
   MUST_USE_RESULT MaybeObject* AllocateEmptyConstantPoolArray();
 
   // Allocate a tenured simple cell.
   MUST_USE_RESULT MaybeObject* AllocateCell(Object* value);
 
   // Allocate a tenured JS global property cell initialized with the hole.
   MUST_USE_RESULT MaybeObject* AllocatePropertyCell();
 
+  // Allocates a new utility object in the old generation.
+  MUST_USE_RESULT MaybeObject* AllocateStruct(InstanceType type);
+
+  // Allocates a new foreign object.
+  MUST_USE_RESULT MaybeObject* AllocateForeign(
+      Address address, PretenureFlag pretenure = NOT_TENURED);
+
+  MUST_USE_RESULT MaybeObject* AllocateCode(int object_size, bool immovable);
+
+  MUST_USE_RESULT MaybeObject* InternalizeStringWithKey(HashTableKey* key);
+
+  MUST_USE_RESULT MaybeObject* InternalizeString(String* str);
+
   // Performs a minor collection in new generation.
   void Scavenge();
 
   // Commits from space if it is uncommitted.
   void EnsureFromSpaceIsCommitted();
 
   // Uncommit unused semi space.
   bool UncommitFromSpace() { return new_space_.UncommitFromSpace(); }
 
   // Fill in bogus values in from space
@@ skipping 858 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_