Mercurial > hg > truffle
annotate src/share/vm/memory/allocation.cpp @ 10334:7c5a1b62f53d
8014971: Minor code cleanup of the freelist management
Reviewed-by: jwilhelm, jmasa, tschatzl
author | brutisso |
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date | Wed, 22 May 2013 08:04:58 +0200 |
parents | f9be75d21404 |
children | a1ebd310d5c1 ce9ecec70f99 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
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28 #include "memory/genCollectedHeap.hpp" |
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29 #include "memory/metaspaceShared.hpp" |
1972 | 30 #include "memory/resourceArea.hpp" |
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31 #include "memory/universe.hpp" |
6197 | 32 #include "runtime/atomic.hpp" |
1972 | 33 #include "runtime/os.hpp" |
34 #include "runtime/task.hpp" | |
35 #include "runtime/threadCritical.hpp" | |
6197 | 36 #include "services/memTracker.hpp" |
1972 | 37 #include "utilities/ostream.hpp" |
6197 | 38 |
1972 | 39 #ifdef TARGET_OS_FAMILY_linux |
40 # include "os_linux.inline.hpp" | |
41 #endif | |
42 #ifdef TARGET_OS_FAMILY_solaris | |
43 # include "os_solaris.inline.hpp" | |
44 #endif | |
45 #ifdef TARGET_OS_FAMILY_windows | |
46 # include "os_windows.inline.hpp" | |
47 #endif | |
3960 | 48 #ifdef TARGET_OS_FAMILY_bsd |
49 # include "os_bsd.inline.hpp" | |
50 #endif | |
0 | 51 |
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52 void* StackObj::operator new(size_t size) { ShouldNotCallThis(); return 0; } |
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53 void StackObj::operator delete(void* p) { ShouldNotCallThis(); } |
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54 void* StackObj::operator new [](size_t size) { ShouldNotCallThis(); return 0; } |
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55 void StackObj::operator delete [](void* p) { ShouldNotCallThis(); } |
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56 |
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57 void* _ValueObj::operator new(size_t size) { ShouldNotCallThis(); return 0; } |
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58 void _ValueObj::operator delete(void* p) { ShouldNotCallThis(); } |
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59 void* _ValueObj::operator new [](size_t size) { ShouldNotCallThis(); return 0; } |
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60 void _ValueObj::operator delete [](void* p) { ShouldNotCallThis(); } |
0 | 61 |
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62 void* MetaspaceObj::operator new(size_t size, ClassLoaderData* loader_data, |
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63 size_t word_size, bool read_only, TRAPS) { |
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64 // Klass has it's own operator new |
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65 return Metaspace::allocate(loader_data, word_size, read_only, |
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66 Metaspace::NonClassType, CHECK_NULL); |
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67 } |
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68 |
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69 bool MetaspaceObj::is_shared() const { |
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70 return MetaspaceShared::is_in_shared_space(this); |
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71 } |
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72 |
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73 bool MetaspaceObj::is_metadata() const { |
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74 // GC Verify checks use this in guarantees. |
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75 // TODO: either replace them with is_metaspace_object() or remove them. |
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76 // is_metaspace_object() is slower than this test. This test doesn't |
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77 // seem very useful for metaspace objects anymore though. |
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78 return !Universe::heap()->is_in_reserved(this); |
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79 } |
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80 |
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81 bool MetaspaceObj::is_metaspace_object() const { |
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82 return Metaspace::contains((void*)this); |
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83 } |
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84 |
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85 void MetaspaceObj::print_address_on(outputStream* st) const { |
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86 st->print(" {"INTPTR_FORMAT"}", this); |
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87 } |
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88 |
6197 | 89 void* ResourceObj::operator new(size_t size, allocation_type type, MEMFLAGS flags) { |
0 | 90 address res; |
91 switch (type) { | |
92 case C_HEAP: | |
6197 | 93 res = (address)AllocateHeap(size, flags, CALLER_PC); |
1685 | 94 DEBUG_ONLY(set_allocation_type(res, C_HEAP);) |
0 | 95 break; |
96 case RESOURCE_AREA: | |
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97 // new(size) sets allocation type RESOURCE_AREA. |
0 | 98 res = (address)operator new(size); |
99 break; | |
100 default: | |
101 ShouldNotReachHere(); | |
102 } | |
103 return res; | |
104 } | |
105 | |
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106 void* ResourceObj::operator new [](size_t size, allocation_type type, MEMFLAGS flags) { |
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107 return (address) operator new(size, type, flags); |
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108 } |
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109 |
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110 void* ResourceObj::operator new(size_t size, const std::nothrow_t& nothrow_constant, |
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111 allocation_type type, MEMFLAGS flags) { |
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112 //should only call this with std::nothrow, use other operator new() otherwise |
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113 address res; |
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114 switch (type) { |
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115 case C_HEAP: |
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116 res = (address)AllocateHeap(size, flags, CALLER_PC, AllocFailStrategy::RETURN_NULL); |
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117 DEBUG_ONLY(if (res!= NULL) set_allocation_type(res, C_HEAP);) |
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118 break; |
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119 case RESOURCE_AREA: |
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120 // new(size) sets allocation type RESOURCE_AREA. |
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121 res = (address)operator new(size, std::nothrow); |
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122 break; |
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123 default: |
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124 ShouldNotReachHere(); |
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125 } |
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126 return res; |
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127 } |
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128 |
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129 void* ResourceObj::operator new [](size_t size, const std::nothrow_t& nothrow_constant, |
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130 allocation_type type, MEMFLAGS flags) { |
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131 return (address)operator new(size, nothrow_constant, type, flags); |
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132 } |
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133 |
0 | 134 void ResourceObj::operator delete(void* p) { |
135 assert(((ResourceObj *)p)->allocated_on_C_heap(), | |
136 "delete only allowed for C_HEAP objects"); | |
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137 DEBUG_ONLY(((ResourceObj *)p)->_allocation_t[0] = (uintptr_t)badHeapOopVal;) |
0 | 138 FreeHeap(p); |
139 } | |
140 | |
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141 void ResourceObj::operator delete [](void* p) { |
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142 operator delete(p); |
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143 } |
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144 |
1685 | 145 #ifdef ASSERT |
146 void ResourceObj::set_allocation_type(address res, allocation_type type) { | |
147 // Set allocation type in the resource object | |
148 uintptr_t allocation = (uintptr_t)res; | |
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149 assert((allocation & allocation_mask) == 0, "address should be aligned to 4 bytes at least"); |
1685 | 150 assert(type <= allocation_mask, "incorrect allocation type"); |
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151 ResourceObj* resobj = (ResourceObj *)res; |
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152 resobj->_allocation_t[0] = ~(allocation + type); |
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153 if (type != STACK_OR_EMBEDDED) { |
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154 // Called from operator new() and CollectionSetChooser(), |
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155 // set verification value. |
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156 resobj->_allocation_t[1] = (uintptr_t)&(resobj->_allocation_t[1]) + type; |
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157 } |
1685 | 158 } |
159 | |
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160 ResourceObj::allocation_type ResourceObj::get_allocation_type() const { |
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161 assert(~(_allocation_t[0] | allocation_mask) == (uintptr_t)this, "lost resource object"); |
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162 return (allocation_type)((~_allocation_t[0]) & allocation_mask); |
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163 } |
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164 |
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165 bool ResourceObj::is_type_set() const { |
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166 allocation_type type = (allocation_type)(_allocation_t[1] & allocation_mask); |
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167 return get_allocation_type() == type && |
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168 (_allocation_t[1] - type) == (uintptr_t)(&_allocation_t[1]); |
1685 | 169 } |
170 | |
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171 ResourceObj::ResourceObj() { // default constructor |
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172 if (~(_allocation_t[0] | allocation_mask) != (uintptr_t)this) { |
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173 // Operator new() is not called for allocations |
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174 // on stack and for embedded objects. |
1685 | 175 set_allocation_type((address)this, STACK_OR_EMBEDDED); |
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176 } else if (allocated_on_stack()) { // STACK_OR_EMBEDDED |
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177 // For some reason we got a value which resembles |
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178 // an embedded or stack object (operator new() does not |
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179 // set such type). Keep it since it is valid value |
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180 // (even if it was garbage). |
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181 // Ignore garbage in other fields. |
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182 } else if (is_type_set()) { |
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183 // Operator new() was called and type was set. |
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184 assert(!allocated_on_stack(), |
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185 err_msg("not embedded or stack, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")", |
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186 this, get_allocation_type(), _allocation_t[0], _allocation_t[1])); |
1685 | 187 } else { |
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188 // Operator new() was not called. |
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189 // Assume that it is embedded or stack object. |
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190 set_allocation_type((address)this, STACK_OR_EMBEDDED); |
1685 | 191 } |
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192 _allocation_t[1] = 0; // Zap verification value |
1685 | 193 } |
194 | |
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195 ResourceObj::ResourceObj(const ResourceObj& r) { // default copy constructor |
1685 | 196 // Used in ClassFileParser::parse_constant_pool_entries() for ClassFileStream. |
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197 // Note: garbage may resembles valid value. |
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198 assert(~(_allocation_t[0] | allocation_mask) != (uintptr_t)this || !is_type_set(), |
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199 err_msg("embedded or stack only, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")", |
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200 this, get_allocation_type(), _allocation_t[0], _allocation_t[1])); |
1685 | 201 set_allocation_type((address)this, STACK_OR_EMBEDDED); |
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202 _allocation_t[1] = 0; // Zap verification value |
1685 | 203 } |
204 | |
205 ResourceObj& ResourceObj::operator=(const ResourceObj& r) { // default copy assignment | |
206 // Used in InlineTree::ok_to_inline() for WarmCallInfo. | |
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207 assert(allocated_on_stack(), |
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208 err_msg("copy only into local, this(" PTR_FORMAT ") type %d a[0]=(" PTR_FORMAT ") a[1]=(" PTR_FORMAT ")", |
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209 this, get_allocation_type(), _allocation_t[0], _allocation_t[1])); |
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210 // Keep current _allocation_t value; |
1685 | 211 return *this; |
212 } | |
213 | |
214 ResourceObj::~ResourceObj() { | |
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215 // allocated_on_C_heap() also checks that encoded (in _allocation) address == this. |
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216 if (!allocated_on_C_heap()) { // ResourceObj::delete() will zap _allocation for C_heap. |
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217 _allocation_t[0] = (uintptr_t)badHeapOopVal; // zap type |
1685 | 218 } |
219 } | |
220 #endif // ASSERT | |
221 | |
222 | |
0 | 223 void trace_heap_malloc(size_t size, const char* name, void* p) { |
224 // A lock is not needed here - tty uses a lock internally | |
2250 | 225 tty->print_cr("Heap malloc " INTPTR_FORMAT " " SIZE_FORMAT " %s", p, size, name == NULL ? "" : name); |
0 | 226 } |
227 | |
228 | |
229 void trace_heap_free(void* p) { | |
230 // A lock is not needed here - tty uses a lock internally | |
231 tty->print_cr("Heap free " INTPTR_FORMAT, p); | |
232 } | |
233 | |
234 //-------------------------------------------------------------------------------------- | |
235 // ChunkPool implementation | |
236 | |
237 // MT-safe pool of chunks to reduce malloc/free thrashing | |
238 // NB: not using Mutex because pools are used before Threads are initialized | |
6197 | 239 class ChunkPool: public CHeapObj<mtInternal> { |
0 | 240 Chunk* _first; // first cached Chunk; its first word points to next chunk |
241 size_t _num_chunks; // number of unused chunks in pool | |
242 size_t _num_used; // number of chunks currently checked out | |
243 const size_t _size; // size of each chunk (must be uniform) | |
244 | |
245 // Our three static pools | |
246 static ChunkPool* _large_pool; | |
247 static ChunkPool* _medium_pool; | |
248 static ChunkPool* _small_pool; | |
249 | |
250 // return first element or null | |
251 void* get_first() { | |
252 Chunk* c = _first; | |
253 if (_first) { | |
254 _first = _first->next(); | |
255 _num_chunks--; | |
256 } | |
257 return c; | |
258 } | |
259 | |
260 public: | |
261 // All chunks in a ChunkPool has the same size | |
262 ChunkPool(size_t size) : _size(size) { _first = NULL; _num_chunks = _num_used = 0; } | |
263 | |
264 // Allocate a new chunk from the pool (might expand the pool) | |
6197 | 265 _NOINLINE_ void* allocate(size_t bytes) { |
0 | 266 assert(bytes == _size, "bad size"); |
267 void* p = NULL; | |
6197 | 268 // No VM lock can be taken inside ThreadCritical lock, so os::malloc |
269 // should be done outside ThreadCritical lock due to NMT | |
0 | 270 { ThreadCritical tc; |
271 _num_used++; | |
272 p = get_first(); | |
273 } | |
6197 | 274 if (p == NULL) p = os::malloc(bytes, mtChunk, CURRENT_PC); |
0 | 275 if (p == NULL) |
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276 vm_exit_out_of_memory(bytes, OOM_MALLOC_ERROR, "ChunkPool::allocate"); |
0 | 277 |
278 return p; | |
279 } | |
280 | |
281 // Return a chunk to the pool | |
282 void free(Chunk* chunk) { | |
283 assert(chunk->length() + Chunk::aligned_overhead_size() == _size, "bad size"); | |
284 ThreadCritical tc; | |
285 _num_used--; | |
286 | |
287 // Add chunk to list | |
288 chunk->set_next(_first); | |
289 _first = chunk; | |
290 _num_chunks++; | |
291 } | |
292 | |
293 // Prune the pool | |
294 void free_all_but(size_t n) { | |
6197 | 295 Chunk* cur = NULL; |
296 Chunk* next; | |
297 { | |
0 | 298 // if we have more than n chunks, free all of them |
299 ThreadCritical tc; | |
300 if (_num_chunks > n) { | |
301 // free chunks at end of queue, for better locality | |
6197 | 302 cur = _first; |
0 | 303 for (size_t i = 0; i < (n - 1) && cur != NULL; i++) cur = cur->next(); |
304 | |
305 if (cur != NULL) { | |
6197 | 306 next = cur->next(); |
0 | 307 cur->set_next(NULL); |
308 cur = next; | |
309 | |
6197 | 310 _num_chunks = n; |
311 } | |
312 } | |
313 } | |
314 | |
315 // Free all remaining chunks, outside of ThreadCritical | |
316 // to avoid deadlock with NMT | |
0 | 317 while(cur != NULL) { |
318 next = cur->next(); | |
6197 | 319 os::free(cur, mtChunk); |
0 | 320 cur = next; |
321 } | |
322 } | |
323 | |
324 // Accessors to preallocated pool's | |
325 static ChunkPool* large_pool() { assert(_large_pool != NULL, "must be initialized"); return _large_pool; } | |
326 static ChunkPool* medium_pool() { assert(_medium_pool != NULL, "must be initialized"); return _medium_pool; } | |
327 static ChunkPool* small_pool() { assert(_small_pool != NULL, "must be initialized"); return _small_pool; } | |
328 | |
329 static void initialize() { | |
330 _large_pool = new ChunkPool(Chunk::size + Chunk::aligned_overhead_size()); | |
331 _medium_pool = new ChunkPool(Chunk::medium_size + Chunk::aligned_overhead_size()); | |
332 _small_pool = new ChunkPool(Chunk::init_size + Chunk::aligned_overhead_size()); | |
333 } | |
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334 |
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335 static void clean() { |
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336 enum { BlocksToKeep = 5 }; |
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337 _small_pool->free_all_but(BlocksToKeep); |
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338 _medium_pool->free_all_but(BlocksToKeep); |
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339 _large_pool->free_all_but(BlocksToKeep); |
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340 } |
0 | 341 }; |
342 | |
343 ChunkPool* ChunkPool::_large_pool = NULL; | |
344 ChunkPool* ChunkPool::_medium_pool = NULL; | |
345 ChunkPool* ChunkPool::_small_pool = NULL; | |
346 | |
347 void chunkpool_init() { | |
348 ChunkPool::initialize(); | |
349 } | |
350 | |
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351 void |
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352 Chunk::clean_chunk_pool() { |
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353 ChunkPool::clean(); |
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354 } |
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355 |
0 | 356 |
357 //-------------------------------------------------------------------------------------- | |
358 // ChunkPoolCleaner implementation | |
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359 // |
0 | 360 |
361 class ChunkPoolCleaner : public PeriodicTask { | |
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362 enum { CleaningInterval = 5000 }; // cleaning interval in ms |
0 | 363 |
364 public: | |
365 ChunkPoolCleaner() : PeriodicTask(CleaningInterval) {} | |
366 void task() { | |
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367 ChunkPool::clean(); |
0 | 368 } |
369 }; | |
370 | |
371 //-------------------------------------------------------------------------------------- | |
372 // Chunk implementation | |
373 | |
374 void* Chunk::operator new(size_t requested_size, size_t length) { | |
375 // requested_size is equal to sizeof(Chunk) but in order for the arena | |
376 // allocations to come out aligned as expected the size must be aligned | |
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377 // to expected arena alignment. |
0 | 378 // expect requested_size but if sizeof(Chunk) doesn't match isn't proper size we must align it. |
379 assert(ARENA_ALIGN(requested_size) == aligned_overhead_size(), "Bad alignment"); | |
380 size_t bytes = ARENA_ALIGN(requested_size) + length; | |
381 switch (length) { | |
382 case Chunk::size: return ChunkPool::large_pool()->allocate(bytes); | |
383 case Chunk::medium_size: return ChunkPool::medium_pool()->allocate(bytes); | |
384 case Chunk::init_size: return ChunkPool::small_pool()->allocate(bytes); | |
385 default: { | |
6197 | 386 void *p = os::malloc(bytes, mtChunk, CALLER_PC); |
0 | 387 if (p == NULL) |
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388 vm_exit_out_of_memory(bytes, OOM_MALLOC_ERROR, "Chunk::new"); |
0 | 389 return p; |
390 } | |
391 } | |
392 } | |
393 | |
394 void Chunk::operator delete(void* p) { | |
395 Chunk* c = (Chunk*)p; | |
396 switch (c->length()) { | |
397 case Chunk::size: ChunkPool::large_pool()->free(c); break; | |
398 case Chunk::medium_size: ChunkPool::medium_pool()->free(c); break; | |
399 case Chunk::init_size: ChunkPool::small_pool()->free(c); break; | |
6197 | 400 default: os::free(c, mtChunk); |
0 | 401 } |
402 } | |
403 | |
404 Chunk::Chunk(size_t length) : _len(length) { | |
405 _next = NULL; // Chain on the linked list | |
406 } | |
407 | |
408 | |
409 void Chunk::chop() { | |
410 Chunk *k = this; | |
411 while( k ) { | |
412 Chunk *tmp = k->next(); | |
413 // clear out this chunk (to detect allocation bugs) | |
414 if (ZapResourceArea) memset(k->bottom(), badResourceValue, k->length()); | |
415 delete k; // Free chunk (was malloc'd) | |
416 k = tmp; | |
417 } | |
418 } | |
419 | |
420 void Chunk::next_chop() { | |
421 _next->chop(); | |
422 _next = NULL; | |
423 } | |
424 | |
425 | |
426 void Chunk::start_chunk_pool_cleaner_task() { | |
427 #ifdef ASSERT | |
428 static bool task_created = false; | |
429 assert(!task_created, "should not start chuck pool cleaner twice"); | |
430 task_created = true; | |
431 #endif | |
432 ChunkPoolCleaner* cleaner = new ChunkPoolCleaner(); | |
433 cleaner->enroll(); | |
434 } | |
435 | |
436 //------------------------------Arena------------------------------------------ | |
6197 | 437 NOT_PRODUCT(volatile jint Arena::_instance_count = 0;) |
0 | 438 |
439 Arena::Arena(size_t init_size) { | |
440 size_t round_size = (sizeof (char *)) - 1; | |
441 init_size = (init_size+round_size) & ~round_size; | |
442 _first = _chunk = new (init_size) Chunk(init_size); | |
443 _hwm = _chunk->bottom(); // Save the cached hwm, max | |
444 _max = _chunk->top(); | |
445 set_size_in_bytes(init_size); | |
6197 | 446 NOT_PRODUCT(Atomic::inc(&_instance_count);) |
0 | 447 } |
448 | |
449 Arena::Arena() { | |
450 _first = _chunk = new (Chunk::init_size) Chunk(Chunk::init_size); | |
451 _hwm = _chunk->bottom(); // Save the cached hwm, max | |
452 _max = _chunk->top(); | |
453 set_size_in_bytes(Chunk::init_size); | |
6197 | 454 NOT_PRODUCT(Atomic::inc(&_instance_count);) |
0 | 455 } |
456 | |
457 Arena *Arena::move_contents(Arena *copy) { | |
458 copy->destruct_contents(); | |
459 copy->_chunk = _chunk; | |
460 copy->_hwm = _hwm; | |
461 copy->_max = _max; | |
462 copy->_first = _first; | |
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463 |
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464 // workaround rare racing condition, which could double count |
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465 // the arena size by native memory tracking |
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466 size_t size = size_in_bytes(); |
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467 set_size_in_bytes(0); |
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468 copy->set_size_in_bytes(size); |
0 | 469 // Destroy original arena |
470 reset(); | |
471 return copy; // Return Arena with contents | |
472 } | |
473 | |
474 Arena::~Arena() { | |
475 destruct_contents(); | |
6197 | 476 NOT_PRODUCT(Atomic::dec(&_instance_count);) |
477 } | |
478 | |
479 void* Arena::operator new(size_t size) { | |
480 assert(false, "Use dynamic memory type binding"); | |
481 return NULL; | |
482 } | |
483 | |
484 void* Arena::operator new (size_t size, const std::nothrow_t& nothrow_constant) { | |
485 assert(false, "Use dynamic memory type binding"); | |
486 return NULL; | |
487 } | |
488 | |
489 // dynamic memory type binding | |
490 void* Arena::operator new(size_t size, MEMFLAGS flags) { | |
491 #ifdef ASSERT | |
492 void* p = (void*)AllocateHeap(size, flags|otArena, CALLER_PC); | |
493 if (PrintMallocFree) trace_heap_malloc(size, "Arena-new", p); | |
494 return p; | |
495 #else | |
496 return (void *) AllocateHeap(size, flags|otArena, CALLER_PC); | |
497 #endif | |
498 } | |
499 | |
500 void* Arena::operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) { | |
501 #ifdef ASSERT | |
502 void* p = os::malloc(size, flags|otArena, CALLER_PC); | |
503 if (PrintMallocFree) trace_heap_malloc(size, "Arena-new", p); | |
504 return p; | |
505 #else | |
506 return os::malloc(size, flags|otArena, CALLER_PC); | |
507 #endif | |
508 } | |
509 | |
510 void Arena::operator delete(void* p) { | |
511 FreeHeap(p); | |
0 | 512 } |
513 | |
514 // Destroy this arenas contents and reset to empty | |
515 void Arena::destruct_contents() { | |
516 if (UseMallocOnly && _first != NULL) { | |
517 char* end = _first->next() ? _first->top() : _hwm; | |
518 free_malloced_objects(_first, _first->bottom(), end, _hwm); | |
519 } | |
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520 // reset size before chop to avoid a rare racing condition |
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521 // that can have total arena memory exceed total chunk memory |
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522 set_size_in_bytes(0); |
0 | 523 _first->chop(); |
524 reset(); | |
525 } | |
526 | |
6197 | 527 // This is high traffic method, but many calls actually don't |
528 // change the size | |
529 void Arena::set_size_in_bytes(size_t size) { | |
530 if (_size_in_bytes != size) { | |
531 _size_in_bytes = size; | |
532 MemTracker::record_arena_size((address)this, size); | |
533 } | |
534 } | |
0 | 535 |
536 // Total of all Chunks in arena | |
537 size_t Arena::used() const { | |
538 size_t sum = _chunk->length() - (_max-_hwm); // Size leftover in this Chunk | |
539 register Chunk *k = _first; | |
540 while( k != _chunk) { // Whilst have Chunks in a row | |
541 sum += k->length(); // Total size of this Chunk | |
542 k = k->next(); // Bump along to next Chunk | |
543 } | |
544 return sum; // Return total consumed space. | |
545 } | |
546 | |
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547 void Arena::signal_out_of_memory(size_t sz, const char* whence) const { |
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548 vm_exit_out_of_memory(sz, OOM_MALLOC_ERROR, whence); |
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549 } |
0 | 550 |
551 // Grow a new Chunk | |
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552 void* Arena::grow(size_t x, AllocFailType alloc_failmode) { |
0 | 553 // Get minimal required size. Either real big, or even bigger for giant objs |
554 size_t len = MAX2(x, (size_t) Chunk::size); | |
555 | |
556 Chunk *k = _chunk; // Get filled-up chunk address | |
557 _chunk = new (len) Chunk(len); | |
558 | |
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559 if (_chunk == NULL) { |
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560 if (alloc_failmode == AllocFailStrategy::EXIT_OOM) { |
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561 signal_out_of_memory(len * Chunk::aligned_overhead_size(), "Arena::grow"); |
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562 } |
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563 return NULL; |
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564 } |
0 | 565 if (k) k->set_next(_chunk); // Append new chunk to end of linked list |
566 else _first = _chunk; | |
567 _hwm = _chunk->bottom(); // Save the cached hwm, max | |
568 _max = _chunk->top(); | |
569 set_size_in_bytes(size_in_bytes() + len); | |
570 void* result = _hwm; | |
571 _hwm += x; | |
572 return result; | |
573 } | |
574 | |
575 | |
576 | |
577 // Reallocate storage in Arena. | |
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578 void *Arena::Arealloc(void* old_ptr, size_t old_size, size_t new_size, AllocFailType alloc_failmode) { |
0 | 579 assert(new_size >= 0, "bad size"); |
580 if (new_size == 0) return NULL; | |
581 #ifdef ASSERT | |
582 if (UseMallocOnly) { | |
583 // always allocate a new object (otherwise we'll free this one twice) | |
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584 char* copy = (char*)Amalloc(new_size, alloc_failmode); |
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585 if (copy == NULL) { |
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586 return NULL; |
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587 } |
0 | 588 size_t n = MIN2(old_size, new_size); |
589 if (n > 0) memcpy(copy, old_ptr, n); | |
590 Afree(old_ptr,old_size); // Mostly done to keep stats accurate | |
591 return copy; | |
592 } | |
593 #endif | |
594 char *c_old = (char*)old_ptr; // Handy name | |
595 // Stupid fast special case | |
596 if( new_size <= old_size ) { // Shrink in-place | |
597 if( c_old+old_size == _hwm) // Attempt to free the excess bytes | |
598 _hwm = c_old+new_size; // Adjust hwm | |
599 return c_old; | |
600 } | |
601 | |
602 // make sure that new_size is legal | |
603 size_t corrected_new_size = ARENA_ALIGN(new_size); | |
604 | |
605 // See if we can resize in-place | |
606 if( (c_old+old_size == _hwm) && // Adjusting recent thing | |
607 (c_old+corrected_new_size <= _max) ) { // Still fits where it sits | |
608 _hwm = c_old+corrected_new_size; // Adjust hwm | |
609 return c_old; // Return old pointer | |
610 } | |
611 | |
612 // Oops, got to relocate guts | |
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613 void *new_ptr = Amalloc(new_size, alloc_failmode); |
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614 if (new_ptr == NULL) { |
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615 return NULL; |
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616 } |
0 | 617 memcpy( new_ptr, c_old, old_size ); |
618 Afree(c_old,old_size); // Mostly done to keep stats accurate | |
619 return new_ptr; | |
620 } | |
621 | |
622 | |
623 // Determine if pointer belongs to this Arena or not. | |
624 bool Arena::contains( const void *ptr ) const { | |
625 #ifdef ASSERT | |
626 if (UseMallocOnly) { | |
627 // really slow, but not easy to make fast | |
628 if (_chunk == NULL) return false; | |
629 char** bottom = (char**)_chunk->bottom(); | |
630 for (char** p = (char**)_hwm - 1; p >= bottom; p--) { | |
631 if (*p == ptr) return true; | |
632 } | |
633 for (Chunk *c = _first; c != NULL; c = c->next()) { | |
634 if (c == _chunk) continue; // current chunk has been processed | |
635 char** bottom = (char**)c->bottom(); | |
636 for (char** p = (char**)c->top() - 1; p >= bottom; p--) { | |
637 if (*p == ptr) return true; | |
638 } | |
639 } | |
640 return false; | |
641 } | |
642 #endif | |
643 if( (void*)_chunk->bottom() <= ptr && ptr < (void*)_hwm ) | |
644 return true; // Check for in this chunk | |
645 for (Chunk *c = _first; c; c = c->next()) { | |
646 if (c == _chunk) continue; // current chunk has been processed | |
647 if ((void*)c->bottom() <= ptr && ptr < (void*)c->top()) { | |
648 return true; // Check for every chunk in Arena | |
649 } | |
650 } | |
651 return false; // Not in any Chunk, so not in Arena | |
652 } | |
653 | |
654 | |
655 #ifdef ASSERT | |
656 void* Arena::malloc(size_t size) { | |
657 assert(UseMallocOnly, "shouldn't call"); | |
658 // use malloc, but save pointer in res. area for later freeing | |
659 char** save = (char**)internal_malloc_4(sizeof(char*)); | |
6197 | 660 return (*save = (char*)os::malloc(size, mtChunk)); |
0 | 661 } |
662 | |
663 // for debugging with UseMallocOnly | |
664 void* Arena::internal_malloc_4(size_t x) { | |
665 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); | |
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666 check_for_overflow(x, "Arena::internal_malloc_4"); |
0 | 667 if (_hwm + x > _max) { |
668 return grow(x); | |
669 } else { | |
670 char *old = _hwm; | |
671 _hwm += x; | |
672 return old; | |
673 } | |
674 } | |
675 #endif | |
676 | |
677 | |
678 //-------------------------------------------------------------------------------------- | |
679 // Non-product code | |
680 | |
681 #ifndef PRODUCT | |
682 // The global operator new should never be called since it will usually indicate | |
683 // a memory leak. Use CHeapObj as the base class of such objects to make it explicit | |
684 // that they're allocated on the C heap. | |
685 // Commented out in product version to avoid conflicts with third-party C++ native code. | |
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686 // On certain platforms, such as Mac OS X (Darwin), in debug version, new is being called |
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687 // from jdk source and causing data corruption. Such as |
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688 // Java_sun_security_ec_ECKeyPairGenerator_generateECKeyPair |
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689 // define ALLOW_OPERATOR_NEW_USAGE for platform on which global operator new allowed. |
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690 // |
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691 #ifndef ALLOW_OPERATOR_NEW_USAGE |
0 | 692 void* operator new(size_t size){ |
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693 assert(false, "Should not call global operator new"); |
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694 return 0; |
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695 } |
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696 |
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697 void* operator new [](size_t size){ |
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698 assert(false, "Should not call global operator new[]"); |
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699 return 0; |
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700 } |
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701 |
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702 void* operator new(size_t size, const std::nothrow_t& nothrow_constant){ |
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703 assert(false, "Should not call global operator new"); |
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704 return 0; |
0 | 705 } |
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706 |
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707 void* operator new [](size_t size, std::nothrow_t& nothrow_constant){ |
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708 assert(false, "Should not call global operator new[]"); |
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709 return 0; |
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710 } |
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711 |
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712 void operator delete(void* p) { |
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713 assert(false, "Should not call global delete"); |
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714 } |
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715 |
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716 void operator delete [](void* p) { |
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717 assert(false, "Should not call global delete []"); |
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718 } |
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719 #endif // ALLOW_OPERATOR_NEW_USAGE |
0 | 720 |
721 void AllocatedObj::print() const { print_on(tty); } | |
722 void AllocatedObj::print_value() const { print_value_on(tty); } | |
723 | |
724 void AllocatedObj::print_on(outputStream* st) const { | |
725 st->print_cr("AllocatedObj(" INTPTR_FORMAT ")", this); | |
726 } | |
727 | |
728 void AllocatedObj::print_value_on(outputStream* st) const { | |
729 st->print("AllocatedObj(" INTPTR_FORMAT ")", this); | |
730 } | |
731 | |
2250 | 732 julong Arena::_bytes_allocated = 0; |
733 | |
734 void Arena::inc_bytes_allocated(size_t x) { inc_stat_counter(&_bytes_allocated, x); } | |
0 | 735 |
736 AllocStats::AllocStats() { | |
2250 | 737 start_mallocs = os::num_mallocs; |
738 start_frees = os::num_frees; | |
0 | 739 start_malloc_bytes = os::alloc_bytes; |
2250 | 740 start_mfree_bytes = os::free_bytes; |
741 start_res_bytes = Arena::_bytes_allocated; | |
0 | 742 } |
743 | |
2250 | 744 julong AllocStats::num_mallocs() { return os::num_mallocs - start_mallocs; } |
745 julong AllocStats::alloc_bytes() { return os::alloc_bytes - start_malloc_bytes; } | |
746 julong AllocStats::num_frees() { return os::num_frees - start_frees; } | |
747 julong AllocStats::free_bytes() { return os::free_bytes - start_mfree_bytes; } | |
748 julong AllocStats::resource_bytes() { return Arena::_bytes_allocated - start_res_bytes; } | |
0 | 749 void AllocStats::print() { |
2250 | 750 tty->print_cr(UINT64_FORMAT " mallocs (" UINT64_FORMAT "MB), " |
751 UINT64_FORMAT" frees (" UINT64_FORMAT "MB), " UINT64_FORMAT "MB resrc", | |
752 num_mallocs(), alloc_bytes()/M, num_frees(), free_bytes()/M, resource_bytes()/M); | |
0 | 753 } |
754 | |
755 | |
756 // debugging code | |
757 inline void Arena::free_all(char** start, char** end) { | |
758 for (char** p = start; p < end; p++) if (*p) os::free(*p); | |
759 } | |
760 | |
761 void Arena::free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) { | |
762 assert(UseMallocOnly, "should not call"); | |
763 // free all objects malloced since resource mark was created; resource area | |
764 // contains their addresses | |
765 if (chunk->next()) { | |
766 // this chunk is full, and some others too | |
767 for (Chunk* c = chunk->next(); c != NULL; c = c->next()) { | |
768 char* top = c->top(); | |
769 if (c->next() == NULL) { | |
770 top = hwm2; // last junk is only used up to hwm2 | |
771 assert(c->contains(hwm2), "bad hwm2"); | |
772 } | |
773 free_all((char**)c->bottom(), (char**)top); | |
774 } | |
775 assert(chunk->contains(hwm), "bad hwm"); | |
776 assert(chunk->contains(max), "bad max"); | |
777 free_all((char**)hwm, (char**)max); | |
778 } else { | |
779 // this chunk was partially used | |
780 assert(chunk->contains(hwm), "bad hwm"); | |
781 assert(chunk->contains(hwm2), "bad hwm2"); | |
782 free_all((char**)hwm, (char**)hwm2); | |
783 } | |
784 } | |
785 | |
786 | |
787 ReallocMark::ReallocMark() { | |
788 #ifdef ASSERT | |
789 Thread *thread = ThreadLocalStorage::get_thread_slow(); | |
790 _nesting = thread->resource_area()->nesting(); | |
791 #endif | |
792 } | |
793 | |
794 void ReallocMark::check() { | |
795 #ifdef ASSERT | |
796 if (_nesting != Thread::current()->resource_area()->nesting()) { | |
797 fatal("allocation bug: array could grow within nested ResourceMark"); | |
798 } | |
799 #endif | |
800 } | |
801 | |
802 #endif // Non-product |