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      1 // Copyright 2008 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 "checks.h"
     32 #include "globals.h"
     33 
     34 namespace v8 {
     35 namespace internal {
     36 
     37 // Called when allocation routines fail to allocate.
     38 // This function should not return, but should terminate the current
     39 // processing.
     40 void FatalProcessOutOfMemory(const char* message);
     41 
     42 // Superclass for classes managed with new & delete.
     43 class Malloced {
     44  public:
     45   void* operator new(size_t size) { return New(size); }
     46   void  operator delete(void* p) { Delete(p); }
     47 
     48   static void FatalProcessOutOfMemory();
     49   static void* New(size_t size);
     50   static void Delete(void* p);
     51 };
     52 
     53 
     54 // A macro is used for defining the base class used for embedded instances.
     55 // The reason is some compilers allocate a minimum of one word for the
     56 // superclass. The macro prevents the use of new & delete in debug mode.
     57 // In release mode we are not willing to pay this overhead.
     58 
     59 #ifdef DEBUG
     60 // Superclass for classes with instances allocated inside stack
     61 // activations or inside other objects.
     62 class Embedded {
     63  public:
     64   void* operator new(size_t size);
     65   void  operator delete(void* p);
     66 };
     67 #define BASE_EMBEDDED : public Embedded
     68 #else
     69 #define BASE_EMBEDDED
     70 #endif
     71 
     72 
     73 // Superclass for classes only using statics.
     74 class AllStatic {
     75 #ifdef DEBUG
     76  public:
     77   void* operator new(size_t size);
     78   void operator delete(void* p);
     79 #endif
     80 };
     81 
     82 
     83 template <typename T>
     84 static T* NewArray(int size) {
     85   T* result = new T[size];
     86   if (result == NULL) Malloced::FatalProcessOutOfMemory();
     87   return result;
     88 }
     89 
     90 
     91 template <typename T>
     92 static void DeleteArray(T* array) {
     93   delete[] array;
     94 }
     95 
     96 
     97 // The normal strdup functions use malloc.  These versions of StrDup
     98 // and StrNDup uses new and calls the FatalProcessOutOfMemory handler
     99 // if allocation fails.
    100 char* StrDup(const char* str);
    101 char* StrNDup(const char* str, int n);
    102 
    103 
    104 // Allocation policy for allocating in the C free store using malloc
    105 // and free. Used as the default policy for lists.
    106 class FreeStoreAllocationPolicy {
    107  public:
    108   INLINE(static void* New(size_t size)) { return Malloced::New(size); }
    109   INLINE(static void Delete(void* p)) { Malloced::Delete(p); }
    110 };
    111 
    112 
    113 // Allocation policy for allocating in preallocated space.
    114 // Used as an allocation policy for ScopeInfo when generating
    115 // stack traces.
    116 class PreallocatedStorage {
    117  public:
    118   explicit PreallocatedStorage(size_t size);
    119   size_t size() { return size_; }
    120 
    121   // TODO(isolates): Get rid of these-- we'll have to change the allocator
    122   //                 interface to include a pointer to an isolate to do this
    123   //                 efficiently.
    124   static inline void* New(size_t size);
    125   static inline void Delete(void* p);
    126 
    127  private:
    128   size_t size_;
    129   PreallocatedStorage* previous_;
    130   PreallocatedStorage* next_;
    131 
    132   void LinkTo(PreallocatedStorage* other);
    133   void Unlink();
    134 
    135   friend class Isolate;
    136 
    137   DISALLOW_IMPLICIT_CONSTRUCTORS(PreallocatedStorage);
    138 };
    139 
    140 
    141 } }  // namespace v8::internal
    142 
    143 #endif  // V8_ALLOCATION_H_
    144