| // Copyright 2008 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_ALLOCATION_H_ |
| #define V8_ALLOCATION_H_ |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| // A class that controls whether allocation is allowed. This is for |
| // the C++ heap only! |
| class NativeAllocationChecker { |
| public: |
| typedef enum { ALLOW, DISALLOW } NativeAllocationAllowed; |
| explicit inline NativeAllocationChecker(NativeAllocationAllowed allowed) |
| : allowed_(allowed) { |
| #ifdef DEBUG |
| if (allowed == DISALLOW) { |
| allocation_disallowed_++; |
| } |
| #endif |
| } |
| ~NativeAllocationChecker() { |
| #ifdef DEBUG |
| if (allowed_ == DISALLOW) { |
| allocation_disallowed_--; |
| } |
| #endif |
| ASSERT(allocation_disallowed_ >= 0); |
| } |
| static inline bool allocation_allowed() { |
| return allocation_disallowed_ == 0; |
| } |
| private: |
| // This static counter ensures that NativeAllocationCheckers can be nested. |
| static int allocation_disallowed_; |
| // This flag applies to this particular instance. |
| NativeAllocationAllowed allowed_; |
| }; |
| |
| |
| // Superclass for classes managed with new & delete. |
| class Malloced { |
| public: |
| void* operator new(size_t size) { return New(size); } |
| void operator delete(void* p) { Delete(p); } |
| |
| static void FatalProcessOutOfMemory(); |
| static void* New(size_t size); |
| static void Delete(void* p); |
| }; |
| |
| |
| // A macro is used for defining the base class used for embedded instances. |
| // The reason is some compilers allocate a minimum of one word for the |
| // superclass. The macro prevents the use of new & delete in debug mode. |
| // In release mode we are not willing to pay this overhead. |
| |
| #ifdef DEBUG |
| // Superclass for classes with instances allocated inside stack |
| // activations or inside other objects. |
| class Embedded { |
| public: |
| void* operator new(size_t size); |
| void operator delete(void* p); |
| }; |
| #define BASE_EMBEDDED : public Embedded |
| #else |
| #define BASE_EMBEDDED |
| #endif |
| |
| |
| // Superclass for classes only using statics. |
| class AllStatic { |
| #ifdef DEBUG |
| public: |
| void* operator new(size_t size); |
| void operator delete(void* p); |
| #endif |
| }; |
| |
| |
| template <typename T> |
| static T* NewArray(int size) { |
| ASSERT(NativeAllocationChecker::allocation_allowed()); |
| T* result = new T[size]; |
| if (result == NULL) Malloced::FatalProcessOutOfMemory(); |
| return result; |
| } |
| |
| |
| template <typename T> |
| static void DeleteArray(T* array) { |
| delete[] array; |
| } |
| |
| |
| // The normal strdup functions use malloc. These versions of StrDup |
| // and StrNDup uses new and calls the FatalProcessOutOfMemory handler |
| // if allocation fails. |
| char* StrDup(const char* str); |
| char* StrNDup(const char* str, size_t n); |
| |
| |
| // Allocation policy for allocating in the C free store using malloc |
| // and free. Used as the default policy for lists. |
| class FreeStoreAllocationPolicy { |
| public: |
| INLINE(static void* New(size_t size)) { return Malloced::New(size); } |
| INLINE(static void Delete(void* p)) { Malloced::Delete(p); } |
| }; |
| |
| |
| // Allocation policy for allocating in preallocated space. |
| // Used as an allocation policy for ScopeInfo when generating |
| // stack traces. |
| class PreallocatedStorage : public AllStatic { |
| public: |
| explicit PreallocatedStorage(size_t size); |
| size_t size() { return size_; } |
| static void* New(size_t size); |
| static void Delete(void* p); |
| |
| // Preallocate a set number of bytes. |
| static void Init(size_t size); |
| |
| private: |
| size_t size_; |
| PreallocatedStorage* previous_; |
| PreallocatedStorage* next_; |
| static bool preallocated_; |
| |
| static PreallocatedStorage in_use_list_; |
| static PreallocatedStorage free_list_; |
| |
| void LinkTo(PreallocatedStorage* other); |
| void Unlink(); |
| DISALLOW_IMPLICIT_CONSTRUCTORS(PreallocatedStorage); |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_ALLOCATION_H_ |