ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1 | // Copyright 2008 the V8 project authors. All rights reserved. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 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 | namespace v8 { namespace internal { |
| 32 | |
| 33 | |
| 34 | // A class that controls whether allocation is allowed. This is for |
| 35 | // the C++ heap only! |
| 36 | class NativeAllocationChecker { |
| 37 | public: |
| 38 | typedef enum { ALLOW, DISALLOW } NativeAllocationAllowed; |
| 39 | explicit inline NativeAllocationChecker(NativeAllocationAllowed allowed) |
| 40 | : allowed_(allowed) { |
| 41 | #ifdef DEBUG |
| 42 | if (allowed == DISALLOW) { |
| 43 | allocation_disallowed_++; |
| 44 | } |
| 45 | #endif |
| 46 | } |
| 47 | ~NativeAllocationChecker() { |
| 48 | #ifdef DEBUG |
| 49 | if (allowed_ == DISALLOW) { |
| 50 | allocation_disallowed_--; |
| 51 | } |
| 52 | #endif |
| 53 | ASSERT(allocation_disallowed_ >= 0); |
| 54 | } |
| 55 | static inline bool allocation_allowed() { |
| 56 | return allocation_disallowed_ == 0; |
| 57 | } |
| 58 | private: |
| 59 | // This static counter ensures that NativeAllocationCheckers can be nested. |
| 60 | static int allocation_disallowed_; |
| 61 | // This flag applies to this particular instance. |
| 62 | NativeAllocationAllowed allowed_; |
| 63 | }; |
| 64 | |
| 65 | |
| 66 | // Superclass for classes managed with new & delete. |
| 67 | class Malloced { |
| 68 | public: |
| 69 | void* operator new(size_t size) { return New(size); } |
| 70 | void operator delete(void* p) { Delete(p); } |
| 71 | |
| 72 | static void FatalProcessOutOfMemory(); |
| 73 | static void* New(size_t size); |
| 74 | static void Delete(void* p); |
| 75 | }; |
| 76 | |
| 77 | |
| 78 | // A macro is used for defining the base class used for embedded instances. |
| 79 | // The reason is some compilers allocate a minimum of one word for the |
| 80 | // superclass. The macro prevents the use of new & delete in debug mode. |
| 81 | // In release mode we are not willing to pay this overhead. |
| 82 | |
| 83 | #ifdef DEBUG |
| 84 | // Superclass for classes with instances allocated inside stack |
| 85 | // activations or inside other objects. |
| 86 | class Embedded { |
| 87 | public: |
| 88 | void* operator new(size_t size); |
| 89 | void operator delete(void* p); |
| 90 | }; |
| 91 | #define BASE_EMBEDDED : public Embedded |
| 92 | #else |
| 93 | #define BASE_EMBEDDED |
| 94 | #endif |
| 95 | |
| 96 | |
| 97 | // Superclass for classes only using statics. |
| 98 | class AllStatic { |
| 99 | #ifdef DEBUG |
| 100 | public: |
| 101 | void* operator new(size_t size); |
| 102 | void operator delete(void* p); |
| 103 | #endif |
| 104 | }; |
| 105 | |
| 106 | |
| 107 | template <typename T> |
| 108 | static T* NewArray(int size) { |
| 109 | ASSERT(NativeAllocationChecker::allocation_allowed()); |
| 110 | T* result = new T[size]; |
| 111 | if (result == NULL) Malloced::FatalProcessOutOfMemory(); |
| 112 | return result; |
| 113 | } |
| 114 | |
| 115 | |
| 116 | template <typename T> |
| 117 | static void DeleteArray(T* array) { |
| 118 | delete[] array; |
| 119 | } |
| 120 | |
| 121 | |
| 122 | // The normal strdup function uses malloc. This version of StrDup |
| 123 | // uses new and calls the FatalProcessOutOfMemory handler if |
| 124 | // allocation fails. |
| 125 | char* StrDup(const char* str); |
| 126 | |
| 127 | |
| 128 | // Allocation policy for allocating in the C free store using malloc |
| 129 | // and free. Used as the default policy for lists. |
| 130 | class FreeStoreAllocationPolicy { |
| 131 | public: |
| 132 | INLINE(static void* New(size_t size)) { return Malloced::New(size); } |
| 133 | INLINE(static void Delete(void* p)) { Malloced::Delete(p); } |
| 134 | }; |
| 135 | |
| 136 | |
| 137 | // Allocation policy for allocating in preallocated space. |
| 138 | // Used as an allocation policy for ScopeInfo when generating |
| 139 | // stack traces. |
| 140 | class PreallocatedStorage : public AllStatic { |
| 141 | public: |
| 142 | explicit PreallocatedStorage(size_t size); |
| 143 | size_t size() { return size_; } |
| 144 | static void* New(size_t size); |
| 145 | static void Delete(void* p); |
| 146 | |
| 147 | // Preallocate a set number of bytes. |
| 148 | static void Init(size_t size); |
| 149 | |
| 150 | private: |
| 151 | size_t size_; |
| 152 | PreallocatedStorage* previous_; |
| 153 | PreallocatedStorage* next_; |
| 154 | static bool preallocated_; |
| 155 | |
| 156 | static PreallocatedStorage in_use_list_; |
| 157 | static PreallocatedStorage free_list_; |
| 158 | |
| 159 | void LinkTo(PreallocatedStorage* other); |
| 160 | void Unlink(); |
| 161 | DISALLOW_IMPLICIT_CONSTRUCTORS(PreallocatedStorage); |
| 162 | }; |
| 163 | |
| 164 | |
| 165 | } } // namespace v8::internal |
| 166 | |
| 167 | #endif // V8_ALLOCATION_H_ |