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Issue 9667026: Revert 126020 - Experiment for updating the tcmalloc chromium branch to r144 (gperftools 2.0). (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: Created 8 years, 9 months ago
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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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