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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #ifndef V8_ALLOCATION_H_
     29 #define V8_ALLOCATION_H_
     30 
     31 #include "globals.h"
     32 
     33 namespace v8 {
     34 namespace internal {
     35 
     36 // Called when allocation routines fail to allocate.
     37 // This function should not return, but should terminate the current
     38 // processing.
     39 void FatalProcessOutOfMemory(const char* message);
     40 
     41 // Superclass for classes managed with new & delete.
     42 class Malloced {
     43  public:
     44   void* operator new(size_t size) { return New(size); }
     45   void  operator delete(void* p) { Delete(p); }
     46 
     47   static void FatalProcessOutOfMemory();
     48   static void* New(size_t size);
     49   static void Delete(void* p);
     50 };
     51 
     52 
     53 // A macro is used for defining the base class used for embedded instances.
     54 // The reason is some compilers allocate a minimum of one word for the
     55 // superclass. The macro prevents the use of new & delete in debug mode.
     56 // In release mode we are not willing to pay this overhead.
     57 
     58 #ifdef DEBUG
     59 // Superclass for classes with instances allocated inside stack
     60 // activations or inside other objects.
     61 class Embedded {
     62  public:
     63   void* operator new(size_t size);
     64   void  operator delete(void* p);
     65 };
     66 #define BASE_EMBEDDED : public Embedded
     67 #else
     68 #define BASE_EMBEDDED
     69 #endif
     70 
     71 
     72 // Superclass for classes only using statics.
     73 class AllStatic {
     74 #ifdef DEBUG
     75  public:
     76   void* operator new(size_t size);
     77   void operator delete(void* p);
     78 #endif
     79 };
     80 
     81 
     82 template <typename T>
     83 T* NewArray(size_t size) {
     84   T* result = new T[size];
     85   if (result == NULL) Malloced::FatalProcessOutOfMemory();
     86   return result;
     87 }
     88 
     89 
     90 template <typename T>
     91 void DeleteArray(T* array) {
     92   delete[] array;
     93 }
     94 
     95 
     96 // The normal strdup functions use malloc.  These versions of StrDup
     97 // and StrNDup uses new and calls the FatalProcessOutOfMemory handler
     98 // if allocation fails.
     99 char* StrDup(const char* str);
    100 char* StrNDup(const char* str, int n);
    101 
    102 
    103 // Allocation policy for allocating in the C free store using malloc
    104 // and free. Used as the default policy for lists.
    105 class FreeStoreAllocationPolicy {
    106  public:
    107   INLINE(static void* New(size_t size)) { return Malloced::New(size); }
    108   INLINE(static void Delete(void* p)) { Malloced::Delete(p); }
    109 };
    110 
    111 
    112 // Allocation policy for allocating in preallocated space.
    113 // Used as an allocation policy for ScopeInfo when generating
    114 // stack traces.
    115 class PreallocatedStorage {
    116  public:
    117   explicit PreallocatedStorage(size_t size);
    118   size_t size() { return size_; }
    119 
    120   // TODO(isolates): Get rid of these-- we'll have to change the allocator
    121   //                 interface to include a pointer to an isolate to do this
    122   //                 efficiently.
    123   static inline void* New(size_t size);
    124   static inline void Delete(void* p);
    125 
    126  private:
    127   size_t size_;
    128   PreallocatedStorage* previous_;
    129   PreallocatedStorage* next_;
    130 
    131   void LinkTo(PreallocatedStorage* other);
    132   void Unlink();
    133 
    134   friend class Isolate;
    135 
    136   DISALLOW_IMPLICIT_CONSTRUCTORS(PreallocatedStorage);
    137 };
    138 
    139 
    140 } }  // namespace v8::internal
    141 
    142 #endif  // V8_ALLOCATION_H_
    143