1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_ALLOCATION_H_ 6 #define V8_ALLOCATION_H_ 7 8 #include "src/base/compiler-specific.h" 9 #include "src/globals.h" 10 11 namespace v8 { 12 namespace internal { 13 14 // Called when allocation routines fail to allocate. 15 // This function should not return, but should terminate the current 16 // processing. 17 V8_EXPORT_PRIVATE void FatalProcessOutOfMemory(const char* message); 18 19 // Superclass for classes managed with new & delete. 20 class V8_EXPORT_PRIVATE Malloced { 21 public: new(size_t size)22 void* operator new(size_t size) { return New(size); } delete(void * p)23 void operator delete(void* p) { Delete(p); } 24 25 static void* New(size_t size); 26 static void Delete(void* p); 27 }; 28 29 30 // A macro is used for defining the base class used for embedded instances. 31 // The reason is some compilers allocate a minimum of one word for the 32 // superclass. The macro prevents the use of new & delete in debug mode. 33 // In release mode we are not willing to pay this overhead. 34 35 #ifdef DEBUG 36 // Superclass for classes with instances allocated inside stack 37 // activations or inside other objects. 38 class Embedded { 39 public: 40 void* operator new(size_t size); 41 void operator delete(void* p); 42 }; 43 #define BASE_EMBEDDED : public NON_EXPORTED_BASE(Embedded) 44 #else 45 #define BASE_EMBEDDED 46 #endif 47 48 49 // Superclass for classes only using static method functions. 50 // The subclass of AllStatic cannot be instantiated at all. 51 class AllStatic { 52 #ifdef DEBUG 53 public: 54 AllStatic() = delete; 55 #endif 56 }; 57 58 59 template <typename T> NewArray(size_t size)60T* NewArray(size_t size) { 61 T* result = new T[size]; 62 if (result == NULL) FatalProcessOutOfMemory("NewArray"); 63 return result; 64 } 65 66 67 template <typename T> DeleteArray(T * array)68void DeleteArray(T* array) { 69 delete[] array; 70 } 71 72 73 // The normal strdup functions use malloc. These versions of StrDup 74 // and StrNDup uses new and calls the FatalProcessOutOfMemory handler 75 // if allocation fails. 76 V8_EXPORT_PRIVATE char* StrDup(const char* str); 77 char* StrNDup(const char* str, int n); 78 79 80 // Allocation policy for allocating in the C free store using malloc 81 // and free. Used as the default policy for lists. 82 class FreeStoreAllocationPolicy { 83 public: INLINE(void * New (size_t size))84 INLINE(void* New(size_t size)) { return Malloced::New(size); } INLINE(static void Delete (void * p))85 INLINE(static void Delete(void* p)) { Malloced::Delete(p); } 86 }; 87 88 89 void* AlignedAlloc(size_t size, size_t alignment); 90 void AlignedFree(void *ptr); 91 92 } // namespace internal 93 } // namespace v8 94 95 #endif // V8_ALLOCATION_H_ 96