Mercurial > hg > truffle
annotate src/share/vm/memory/allocation.hpp @ 4939:45a1bf98f1bb
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Reviewed-by: kvn, never
author | twisti |
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date | Mon, 13 Feb 2012 02:29:22 -0800 |
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0 | 1 /* |
2250 | 2 * Copyright (c) 1997, 2011, 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 #ifndef SHARE_VM_MEMORY_ALLOCATION_HPP |
26 #define SHARE_VM_MEMORY_ALLOCATION_HPP | |
27 | |
28 #include "runtime/globals.hpp" | |
29 #include "utilities/globalDefinitions.hpp" | |
30 #ifdef COMPILER1 | |
31 #include "c1/c1_globals.hpp" | |
32 #endif | |
33 #ifdef COMPILER2 | |
34 #include "opto/c2_globals.hpp" | |
35 #endif | |
36 | |
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37 #include <new> |
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38 |
0 | 39 #define ARENA_ALIGN_M1 (((size_t)(ARENA_AMALLOC_ALIGNMENT)) - 1) |
40 #define ARENA_ALIGN_MASK (~((size_t)ARENA_ALIGN_M1)) | |
41 #define ARENA_ALIGN(x) ((((size_t)(x)) + ARENA_ALIGN_M1) & ARENA_ALIGN_MASK) | |
42 | |
43 // All classes in the virtual machine must be subclassed | |
44 // by one of the following allocation classes: | |
45 // | |
46 // For objects allocated in the resource area (see resourceArea.hpp). | |
47 // - ResourceObj | |
48 // | |
49 // For objects allocated in the C-heap (managed by: free & malloc). | |
50 // - CHeapObj | |
51 // | |
52 // For objects allocated on the stack. | |
53 // - StackObj | |
54 // | |
55 // For embedded objects. | |
56 // - ValueObj | |
57 // | |
58 // For classes used as name spaces. | |
59 // - AllStatic | |
60 // | |
61 // The printable subclasses are used for debugging and define virtual | |
62 // member functions for printing. Classes that avoid allocating the | |
63 // vtbl entries in the objects should therefore not be the printable | |
64 // subclasses. | |
65 // | |
66 // The following macros and function should be used to allocate memory | |
67 // directly in the resource area or in the C-heap: | |
68 // | |
69 // NEW_RESOURCE_ARRAY(type,size) | |
70 // NEW_RESOURCE_OBJ(type) | |
71 // NEW_C_HEAP_ARRAY(type,size) | |
72 // NEW_C_HEAP_OBJ(type) | |
73 // char* AllocateHeap(size_t size, const char* name); | |
74 // void FreeHeap(void* p); | |
75 // | |
76 // C-heap allocation can be traced using +PrintHeapAllocation. | |
77 // malloc and free should therefore never called directly. | |
78 | |
79 // Base class for objects allocated in the C-heap. | |
80 | |
81 // In non product mode we introduce a super class for all allocation classes | |
82 // that supports printing. | |
83 // We avoid the superclass in product mode since some C++ compilers add | |
84 // a word overhead for empty super classes. | |
85 | |
86 #ifdef PRODUCT | |
87 #define ALLOCATION_SUPER_CLASS_SPEC | |
88 #else | |
89 #define ALLOCATION_SUPER_CLASS_SPEC : public AllocatedObj | |
90 class AllocatedObj { | |
91 public: | |
92 // Printing support | |
93 void print() const; | |
94 void print_value() const; | |
95 | |
96 virtual void print_on(outputStream* st) const; | |
97 virtual void print_value_on(outputStream* st) const; | |
98 }; | |
99 #endif | |
100 | |
101 class CHeapObj ALLOCATION_SUPER_CLASS_SPEC { | |
102 public: | |
103 void* operator new(size_t size); | |
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104 void* operator new (size_t size, const std::nothrow_t& nothrow_constant); |
0 | 105 void operator delete(void* p); |
106 void* new_array(size_t size); | |
107 }; | |
108 | |
109 // Base class for objects allocated on the stack only. | |
110 // Calling new or delete will result in fatal error. | |
111 | |
112 class StackObj ALLOCATION_SUPER_CLASS_SPEC { | |
113 public: | |
114 void* operator new(size_t size); | |
115 void operator delete(void* p); | |
116 }; | |
117 | |
118 // Base class for objects used as value objects. | |
119 // Calling new or delete will result in fatal error. | |
120 // | |
121 // Portability note: Certain compilers (e.g. gcc) will | |
122 // always make classes bigger if it has a superclass, even | |
123 // if the superclass does not have any virtual methods or | |
124 // instance fields. The HotSpot implementation relies on this | |
125 // not to happen. So never make a ValueObj class a direct subclass | |
126 // of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g., | |
127 // like this: | |
128 // | |
129 // class A VALUE_OBJ_CLASS_SPEC { | |
130 // ... | |
131 // } | |
132 // | |
133 // With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can | |
134 // be defined as a an empty string "". | |
135 // | |
136 class _ValueObj { | |
137 public: | |
138 void* operator new(size_t size); | |
139 void operator delete(void* p); | |
140 }; | |
141 | |
142 // Base class for classes that constitute name spaces. | |
143 | |
144 class AllStatic { | |
145 public: | |
146 AllStatic() { ShouldNotCallThis(); } | |
147 ~AllStatic() { ShouldNotCallThis(); } | |
148 }; | |
149 | |
150 | |
151 //------------------------------Chunk------------------------------------------ | |
152 // Linked list of raw memory chunks | |
153 class Chunk: public CHeapObj { | |
3939 | 154 friend class VMStructs; |
155 | |
0 | 156 protected: |
157 Chunk* _next; // Next Chunk in list | |
158 const size_t _len; // Size of this Chunk | |
159 public: | |
160 void* operator new(size_t size, size_t length); | |
161 void operator delete(void* p); | |
162 Chunk(size_t length); | |
163 | |
164 enum { | |
165 // default sizes; make them slightly smaller than 2**k to guard against | |
166 // buddy-system style malloc implementations | |
167 #ifdef _LP64 | |
168 slack = 40, // [RGV] Not sure if this is right, but make it | |
169 // a multiple of 8. | |
170 #else | |
171 slack = 20, // suspected sizeof(Chunk) + internal malloc headers | |
172 #endif | |
173 | |
174 init_size = 1*K - slack, // Size of first chunk | |
175 medium_size= 10*K - slack, // Size of medium-sized chunk | |
176 size = 32*K - slack, // Default size of an Arena chunk (following the first) | |
177 non_pool_size = init_size + 32 // An initial size which is not one of above | |
178 }; | |
179 | |
180 void chop(); // Chop this chunk | |
181 void next_chop(); // Chop next chunk | |
182 static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); } | |
183 | |
184 size_t length() const { return _len; } | |
185 Chunk* next() const { return _next; } | |
186 void set_next(Chunk* n) { _next = n; } | |
187 // Boundaries of data area (possibly unused) | |
188 char* bottom() const { return ((char*) this) + aligned_overhead_size(); } | |
189 char* top() const { return bottom() + _len; } | |
190 bool contains(char* p) const { return bottom() <= p && p <= top(); } | |
191 | |
192 // Start the chunk_pool cleaner task | |
193 static void start_chunk_pool_cleaner_task(); | |
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194 |
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195 static void clean_chunk_pool(); |
0 | 196 }; |
197 | |
198 //------------------------------Arena------------------------------------------ | |
199 // Fast allocation of memory | |
200 class Arena: public CHeapObj { | |
201 protected: | |
202 friend class ResourceMark; | |
203 friend class HandleMark; | |
204 friend class NoHandleMark; | |
3939 | 205 friend class VMStructs; |
206 | |
0 | 207 Chunk *_first; // First chunk |
208 Chunk *_chunk; // current chunk | |
209 char *_hwm, *_max; // High water mark and max in current chunk | |
210 void* grow(size_t x); // Get a new Chunk of at least size x | |
211 NOT_PRODUCT(size_t _size_in_bytes;) // Size of arena (used for memory usage tracing) | |
2250 | 212 NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start |
0 | 213 friend class AllocStats; |
214 debug_only(void* malloc(size_t size);) | |
215 debug_only(void* internal_malloc_4(size_t x);) | |
2250 | 216 NOT_PRODUCT(void inc_bytes_allocated(size_t x);) |
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217 |
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218 void signal_out_of_memory(size_t request, const char* whence) const; |
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219 |
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220 void check_for_overflow(size_t request, const char* whence) const { |
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221 if (UINTPTR_MAX - request < (uintptr_t)_hwm) { |
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222 signal_out_of_memory(request, whence); |
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223 } |
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224 } |
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225 |
0 | 226 public: |
227 Arena(); | |
228 Arena(size_t init_size); | |
229 Arena(Arena *old); | |
230 ~Arena(); | |
231 void destruct_contents(); | |
232 char* hwm() const { return _hwm; } | |
233 | |
234 // Fast allocate in the arena. Common case is: pointer test + increment. | |
235 void* Amalloc(size_t x) { | |
236 assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2"); | |
237 x = ARENA_ALIGN(x); | |
238 debug_only(if (UseMallocOnly) return malloc(x);) | |
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239 check_for_overflow(x, "Arena::Amalloc"); |
2250 | 240 NOT_PRODUCT(inc_bytes_allocated(x);) |
0 | 241 if (_hwm + x > _max) { |
242 return grow(x); | |
243 } else { | |
244 char *old = _hwm; | |
245 _hwm += x; | |
246 return old; | |
247 } | |
248 } | |
249 // Further assume size is padded out to words | |
250 void *Amalloc_4(size_t x) { | |
251 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); | |
252 debug_only(if (UseMallocOnly) return malloc(x);) | |
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253 check_for_overflow(x, "Arena::Amalloc_4"); |
2250 | 254 NOT_PRODUCT(inc_bytes_allocated(x);) |
0 | 255 if (_hwm + x > _max) { |
256 return grow(x); | |
257 } else { | |
258 char *old = _hwm; | |
259 _hwm += x; | |
260 return old; | |
261 } | |
262 } | |
263 | |
264 // Allocate with 'double' alignment. It is 8 bytes on sparc. | |
265 // In other cases Amalloc_D() should be the same as Amalloc_4(). | |
266 void* Amalloc_D(size_t x) { | |
267 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); | |
268 debug_only(if (UseMallocOnly) return malloc(x);) | |
269 #if defined(SPARC) && !defined(_LP64) | |
270 #define DALIGN_M1 7 | |
271 size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm; | |
272 x += delta; | |
273 #endif | |
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274 check_for_overflow(x, "Arena::Amalloc_D"); |
2250 | 275 NOT_PRODUCT(inc_bytes_allocated(x);) |
0 | 276 if (_hwm + x > _max) { |
277 return grow(x); // grow() returns a result aligned >= 8 bytes. | |
278 } else { | |
279 char *old = _hwm; | |
280 _hwm += x; | |
281 #if defined(SPARC) && !defined(_LP64) | |
282 old += delta; // align to 8-bytes | |
283 #endif | |
284 return old; | |
285 } | |
286 } | |
287 | |
288 // Fast delete in area. Common case is: NOP (except for storage reclaimed) | |
289 void Afree(void *ptr, size_t size) { | |
290 #ifdef ASSERT | |
291 if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory | |
292 if (UseMallocOnly) return; | |
293 #endif | |
294 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; | |
295 } | |
296 | |
297 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size ); | |
298 | |
299 // Move contents of this arena into an empty arena | |
300 Arena *move_contents(Arena *empty_arena); | |
301 | |
302 // Determine if pointer belongs to this Arena or not. | |
303 bool contains( const void *ptr ) const; | |
304 | |
305 // Total of all chunks in use (not thread-safe) | |
306 size_t used() const; | |
307 | |
308 // Total # of bytes used | |
309 size_t size_in_bytes() const NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
310 void set_size_in_bytes(size_t size) NOT_PRODUCT({ _size_in_bytes = size; }) PRODUCT_RETURN; | |
311 static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN; | |
312 static void free_all(char** start, char** end) PRODUCT_RETURN; | |
313 | |
314 private: | |
315 // Reset this Arena to empty, access will trigger grow if necessary | |
316 void reset(void) { | |
317 _first = _chunk = NULL; | |
318 _hwm = _max = NULL; | |
319 } | |
320 }; | |
321 | |
322 // One of the following macros must be used when allocating | |
323 // an array or object from an arena | |
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324 #define NEW_ARENA_ARRAY(arena, type, size) \ |
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325 (type*) (arena)->Amalloc((size) * sizeof(type)) |
0 | 326 |
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327 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \ |
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328 (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \ |
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329 (new_size) * sizeof(type) ) |
0 | 330 |
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331 #define FREE_ARENA_ARRAY(arena, type, old, size) \ |
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332 (arena)->Afree((char*)(old), (size) * sizeof(type)) |
0 | 333 |
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334 #define NEW_ARENA_OBJ(arena, type) \ |
0 | 335 NEW_ARENA_ARRAY(arena, type, 1) |
336 | |
337 | |
338 //%note allocation_1 | |
339 extern char* resource_allocate_bytes(size_t size); | |
340 extern char* resource_allocate_bytes(Thread* thread, size_t size); | |
341 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size); | |
342 extern void resource_free_bytes( char *old, size_t size ); | |
343 | |
344 //---------------------------------------------------------------------- | |
345 // Base class for objects allocated in the resource area per default. | |
346 // Optionally, objects may be allocated on the C heap with | |
347 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena) | |
348 // ResourceObj's can be allocated within other objects, but don't use | |
349 // new or delete (allocation_type is unknown). If new is used to allocate, | |
350 // use delete to deallocate. | |
351 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC { | |
352 public: | |
1685 | 353 enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 }; |
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354 static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN; |
0 | 355 #ifdef ASSERT |
356 private: | |
1685 | 357 // When this object is allocated on stack the new() operator is not |
358 // called but garbage on stack may look like a valid allocation_type. | |
359 // Store negated 'this' pointer when new() is called to distinguish cases. | |
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360 // Use second array's element for verification value to distinguish garbage. |
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361 uintptr_t _allocation_t[2]; |
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362 bool is_type_set() const; |
0 | 363 public: |
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364 allocation_type get_allocation_type() const; |
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365 bool allocated_on_stack() const { return get_allocation_type() == STACK_OR_EMBEDDED; } |
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366 bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; } |
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367 bool allocated_on_C_heap() const { return get_allocation_type() == C_HEAP; } |
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368 bool allocated_on_arena() const { return get_allocation_type() == ARENA; } |
1685 | 369 ResourceObj(); // default construtor |
370 ResourceObj(const ResourceObj& r); // default copy construtor | |
371 ResourceObj& operator=(const ResourceObj& r); // default copy assignment | |
372 ~ResourceObj(); | |
0 | 373 #endif // ASSERT |
374 | |
375 public: | |
376 void* operator new(size_t size, allocation_type type); | |
377 void* operator new(size_t size, Arena *arena) { | |
378 address res = (address)arena->Amalloc(size); | |
1685 | 379 DEBUG_ONLY(set_allocation_type(res, ARENA);) |
0 | 380 return res; |
381 } | |
382 void* operator new(size_t size) { | |
383 address res = (address)resource_allocate_bytes(size); | |
1685 | 384 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);) |
0 | 385 return res; |
386 } | |
387 void operator delete(void* p); | |
388 }; | |
389 | |
390 // One of the following macros must be used when allocating an array | |
391 // or object to determine whether it should reside in the C heap on in | |
392 // the resource area. | |
393 | |
394 #define NEW_RESOURCE_ARRAY(type, size)\ | |
395 (type*) resource_allocate_bytes((size) * sizeof(type)) | |
396 | |
397 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\ | |
398 (type*) resource_allocate_bytes(thread, (size) * sizeof(type)) | |
399 | |
400 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\ | |
401 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type) ) | |
402 | |
403 #define FREE_RESOURCE_ARRAY(type, old, size)\ | |
404 resource_free_bytes((char*)(old), (size) * sizeof(type)) | |
405 | |
406 #define FREE_FAST(old)\ | |
407 /* nop */ | |
408 | |
409 #define NEW_RESOURCE_OBJ(type)\ | |
410 NEW_RESOURCE_ARRAY(type, 1) | |
411 | |
412 #define NEW_C_HEAP_ARRAY(type, size)\ | |
413 (type*) (AllocateHeap((size) * sizeof(type), XSTR(type) " in " __FILE__)) | |
414 | |
415 #define REALLOC_C_HEAP_ARRAY(type, old, size)\ | |
416 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), XSTR(type) " in " __FILE__)) | |
417 | |
418 #define FREE_C_HEAP_ARRAY(type,old) \ | |
419 FreeHeap((char*)(old)) | |
420 | |
421 #define NEW_C_HEAP_OBJ(type)\ | |
422 NEW_C_HEAP_ARRAY(type, 1) | |
423 | |
424 extern bool warn_new_operator; | |
425 | |
426 // for statistics | |
427 #ifndef PRODUCT | |
428 class AllocStats : StackObj { | |
2250 | 429 julong start_mallocs, start_frees; |
430 julong start_malloc_bytes, start_mfree_bytes, start_res_bytes; | |
0 | 431 public: |
432 AllocStats(); | |
433 | |
2250 | 434 julong num_mallocs(); // since creation of receiver |
435 julong alloc_bytes(); | |
436 julong num_frees(); | |
437 julong free_bytes(); | |
438 julong resource_bytes(); | |
0 | 439 void print(); |
440 }; | |
441 #endif | |
442 | |
443 | |
444 //------------------------------ReallocMark--------------------------------- | |
445 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated | |
446 // ReallocMark, which is declared in the same scope as the reallocated | |
447 // pointer. Any operation that could __potentially__ cause a reallocation | |
448 // should check the ReallocMark. | |
449 class ReallocMark: public StackObj { | |
450 protected: | |
451 NOT_PRODUCT(int _nesting;) | |
452 | |
453 public: | |
454 ReallocMark() PRODUCT_RETURN; | |
455 void check() PRODUCT_RETURN; | |
456 }; | |
1972 | 457 |
458 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP |