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1 // Copyright (c) 2008, Google Inc. | 1 // Copyright (c) 2008, Google Inc. |
2 // All rights reserved. | 2 // All rights reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions are | 5 // modification, are permitted provided that the following conditions are |
6 // met: | 6 // met: |
7 // | 7 // |
8 // * Redistributions of source code must retain the above copyright | 8 // * Redistributions of source code must retain the above copyright |
9 // notice, this list of conditions and the following disclaimer. | 9 // notice, this list of conditions and the following disclaimer. |
10 // * Redistributions in binary form must reproduce the above | 10 // * Redistributions in binary form must reproduce the above |
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30 // --- | 30 // --- |
31 // Author: Sanjay Ghemawat <opensource@google.com> | 31 // Author: Sanjay Ghemawat <opensource@google.com> |
32 | 32 |
33 #ifndef TCMALLOC_PAGE_HEAP_ALLOCATOR_H_ | 33 #ifndef TCMALLOC_PAGE_HEAP_ALLOCATOR_H_ |
34 #define TCMALLOC_PAGE_HEAP_ALLOCATOR_H_ | 34 #define TCMALLOC_PAGE_HEAP_ALLOCATOR_H_ |
35 | 35 |
36 #include <stddef.h> // for NULL, size_t | 36 #include <stddef.h> // for NULL, size_t |
37 | 37 |
38 #include "common.h" // for MetaDataAlloc | 38 #include "common.h" // for MetaDataAlloc |
39 #include "free_list.h" // for FL_Push/FL_Pop | 39 #include "free_list.h" // for FL_Push/FL_Pop |
40 #include "internal_logging.h" // for ASSERT | 40 #include "internal_logging.h" // for ASSERT, CRASH |
41 #include "system-alloc.h" // for TCMalloc_SystemAddGuard | 41 #include "system-alloc.h" // for TCMalloc_SystemAddGuard |
42 | 42 |
43 namespace tcmalloc { | 43 namespace tcmalloc { |
44 | 44 |
45 // Simple allocator for objects of a specified type. External locking | 45 // Simple allocator for objects of a specified type. External locking |
46 // is required before accessing one of these objects. | 46 // is required before accessing one of these objects. |
47 template <class T> | 47 template <class T> |
48 class PageHeapAllocator { | 48 class PageHeapAllocator { |
49 public: | 49 public: |
50 // We use an explicit Init function because these variables are statically | 50 // We use an explicit Init function because these variables are statically |
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64 // Consult free list | 64 // Consult free list |
65 void* result; | 65 void* result; |
66 if (free_list_ != NULL) { | 66 if (free_list_ != NULL) { |
67 result = FL_Pop(&free_list_); | 67 result = FL_Pop(&free_list_); |
68 } else { | 68 } else { |
69 if (free_avail_ < sizeof(T)) { | 69 if (free_avail_ < sizeof(T)) { |
70 // Need more room. We assume that MetaDataAlloc returns | 70 // Need more room. We assume that MetaDataAlloc returns |
71 // suitably aligned memory. | 71 // suitably aligned memory. |
72 free_area_ = reinterpret_cast<char*>(MetaDataAlloc(kAllocIncrement)); | 72 free_area_ = reinterpret_cast<char*>(MetaDataAlloc(kAllocIncrement)); |
73 if (free_area_ == NULL) { | 73 if (free_area_ == NULL) { |
74 Log(kCrash, __FILE__, __LINE__, | 74 CRASH("FATAL ERROR: Out of memory trying to allocate internal " |
75 "FATAL ERROR: Out of memory trying to allocate internal " | 75 "tcmalloc data (%d bytes, object-size %d)\n", |
76 "tcmalloc data (bytes, object-size)", | 76 kAllocIncrement, static_cast<int>(sizeof(T))); |
77 kAllocIncrement, sizeof(T)); | |
78 } | 77 } |
79 | 78 |
80 // This guard page protects the metadata from being corrupted by a | 79 // This guard page protects the metadata from being corrupted by a |
81 // buffer overrun. We currently have no mechanism for freeing it, since | 80 // buffer overrun. We currently have no mechanism for freeing it, since |
82 // we never release the metadata buffer. If that changes we'll need to | 81 // we never release the metadata buffer. If that changes we'll need to |
83 // add something like TCMalloc_SystemRemoveGuard. | 82 // add something like TCMalloc_SystemRemoveGuard. |
84 size_t guard_size = TCMalloc_SystemAddGuard(free_area_, | 83 size_t guard_size = TCMalloc_SystemAddGuard(free_area_, |
85 kAllocIncrement); | 84 kAllocIncrement); |
86 free_area_ += guard_size; | 85 free_area_ += guard_size; |
87 free_avail_ = kAllocIncrement - guard_size; | 86 free_avail_ = kAllocIncrement - guard_size; |
88 if (free_avail_ < sizeof(T)) { | 87 if (free_avail_ < sizeof(T)) { |
89 Log(kCrash, __FILE__, __LINE__, | 88 CRASH("FATAL ERROR: Insufficient memory to guard internal tcmalloc " |
90 "FATAL ERROR: Insufficient memory to guard internal tcmalloc " | 89 "data (%d bytes, object-size %d, guard-size %d)\n", |
91 "data (%d bytes, object-size %d, guard-size %d)\n", | 90 kAllocIncrement, static_cast<int>(sizeof(T)), guard_size); |
92 kAllocIncrement, static_cast<int>(sizeof(T)), guard_size); | |
93 } | 91 } |
94 } | 92 } |
95 result = free_area_; | 93 result = free_area_; |
96 free_area_ += sizeof(T); | 94 free_area_ += sizeof(T); |
97 free_avail_ -= sizeof(T); | 95 free_avail_ -= sizeof(T); |
98 } | 96 } |
99 inuse_++; | 97 inuse_++; |
100 return reinterpret_cast<T*>(result); | 98 return reinterpret_cast<T*>(result); |
101 } | 99 } |
102 | 100 |
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118 // Free list of already carved objects | 116 // Free list of already carved objects |
119 void* free_list_; | 117 void* free_list_; |
120 | 118 |
121 // Number of allocated but unfreed objects | 119 // Number of allocated but unfreed objects |
122 int inuse_; | 120 int inuse_; |
123 }; | 121 }; |
124 | 122 |
125 } // namespace tcmalloc | 123 } // namespace tcmalloc |
126 | 124 |
127 #endif // TCMALLOC_PAGE_HEAP_ALLOCATOR_H_ | 125 #endif // TCMALLOC_PAGE_HEAP_ALLOCATOR_H_ |
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