allocation.hpp revision 13370:731370f39fcd
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 31541Srgrimes * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 41541Srgrimes * 51541Srgrimes * This code is free software; you can redistribute it and/or modify it 61541Srgrimes * under the terms of the GNU General Public License version 2 only, as 71541Srgrimes * published by the Free Software Foundation. 81541Srgrimes * 91541Srgrimes * This code is distributed in the hope that it will be useful, but WITHOUT 101541Srgrimes * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 111541Srgrimes * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 121541Srgrimes * version 2 for more details (a copy is included in the LICENSE file that 131541Srgrimes * accompanied this code). 1458705Scharnier * 151541Srgrimes * You should have received a copy of the GNU General Public License version 161541Srgrimes * 2 along with this work; if not, write to the Free Software Foundation, 171541Srgrimes * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 181541Srgrimes * 191541Srgrimes * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 201541Srgrimes * or visit www.oracle.com if you need additional information or have any 211541Srgrimes * questions. 221541Srgrimes * 231541Srgrimes */ 241541Srgrimes 251541Srgrimes#ifndef SHARE_VM_MEMORY_ALLOCATION_HPP 261541Srgrimes#define SHARE_VM_MEMORY_ALLOCATION_HPP 271541Srgrimes 281541Srgrimes#include "runtime/globals.hpp" 291541Srgrimes#include "utilities/globalDefinitions.hpp" 301541Srgrimes#include "utilities/macros.hpp" 311541Srgrimes#ifdef COMPILER1 321541Srgrimes#include "c1/c1_globals.hpp" 331541Srgrimes#endif 3450477Speter#ifdef COMPILER2 351541Srgrimes#include "opto/c2_globals.hpp" 361541Srgrimes#endif 371541Srgrimes 381541Srgrimes#include <new> 391541Srgrimes 401541Srgrimes// The byte alignment to be used by Arena::Amalloc. See bugid 4169348. 4134924Sbde// Note: this value must be a power of 2 4212662Sdg 4312662Sdg#define ARENA_AMALLOC_ALIGNMENT (2*BytesPerWord) 441541Srgrimes 4540794Speter#define ARENA_ALIGN_M1 (((size_t)(ARENA_AMALLOC_ALIGNMENT)) - 1) 4612726Sbde#define ARENA_ALIGN_MASK (~((size_t)ARENA_ALIGN_M1)) 4712662Sdg#define ARENA_ALIGN(x) ((((size_t)(x)) + ARENA_ALIGN_M1) & ARENA_ALIGN_MASK) 4822521Sdyson 4912662Sdgclass AllocFailStrategy { 5012662Sdgpublic: 5112662Sdg enum AllocFailEnum { EXIT_OOM, RETURN_NULL }; 521541Srgrimes}; 531541Srgrimestypedef AllocFailStrategy::AllocFailEnum AllocFailType; 5412623Sphk 5512623Sphk// All classes in the virtual machine must be subclassed 5612623Sphk// by one of the following allocation classes: 579759Sbde// 581541Srgrimes// For objects allocated in the resource area (see resourceArea.hpp). 5912820Sphk// - ResourceObj 601541Srgrimes// 611541Srgrimes// For objects allocated in the C-heap (managed by: free & malloc). 621541Srgrimes// - CHeapObj 631541Srgrimes// 641541Srgrimes// For objects allocated on the stack. 6512820Sphk// - StackObj 661541Srgrimes// 671541Srgrimes// For embedded objects. 681541Srgrimes// - ValueObj 691541Srgrimes// 701541Srgrimes// For classes used as name spaces. 711541Srgrimes// - AllStatic 721541Srgrimes// 731541Srgrimes// For classes in Metaspace (class data) 741541Srgrimes// - MetaspaceObj 759507Sdg// 7612286Sphk// The printable subclasses are used for debugging and define virtual 771541Srgrimes// member functions for printing. Classes that avoid allocating the 781541Srgrimes// vtbl entries in the objects should therefore not be the printable 791541Srgrimes// subclasses. 801541Srgrimes// 8169947Sjake// The following macros and function should be used to allocate memory 8214531Shsu// directly in the resource area or in the C-heap, The _OBJ variants 831541Srgrimes// of the NEW/FREE_C_HEAP macros are used for alloc/dealloc simple 841541Srgrimes// objects which are not inherited from CHeapObj, note constructor and 851541Srgrimes// destructor are not called. The preferable way to allocate objects 861541Srgrimes// is using the new operator. 8758634Scharnier// 881541Srgrimes// WARNING: The array variant must only be used for a homogenous array 8965904Sjhb// where all objects are of the exact type specified. If subtypes are 9065904Sjhb// stored in the array then must pay attention to calling destructors 9165904Sjhb// at needed. 921541Srgrimes// 931541Srgrimes// NEW_RESOURCE_ARRAY(type, size) 941541Srgrimes// NEW_RESOURCE_OBJ(type) 951541Srgrimes// NEW_C_HEAP_ARRAY(type, size) 9669947Sjake// NEW_C_HEAP_OBJ(type, memflags) 971541Srgrimes// FREE_C_HEAP_ARRAY(type, old) 981541Srgrimes// FREE_C_HEAP_OBJ(objname, type, memflags) 995455Sdg// char* AllocateHeap(size_t size, const char* name); 1001541Srgrimes// void FreeHeap(void* p); 1011541Srgrimes// 1029507Sdg// C-heap allocation can be traced using +PrintHeapAllocation. 1039507Sdg// malloc and free should therefore never called directly. 1049507Sdg 1059507Sdg// Base class for objects allocated in the C-heap. 10634961Sphk 1079507Sdg// In non product mode we introduce a super class for all allocation classes 1089507Sdg// that supports printing. 1099507Sdg// We avoid the superclass in product mode since some C++ compilers add 1109507Sdg// a word overhead for empty super classes. 1119507Sdg 11262622Sjhb#ifdef PRODUCT 11312286Sphk#define ALLOCATION_SUPER_CLASS_SPEC 11462622Sjhb#else 11512286Sphk#define ALLOCATION_SUPER_CLASS_SPEC : public AllocatedObj 11662622Sjhbclass AllocatedObj { 11712286Sphk public: 11862622Sjhb // Printing support 11912286Sphk void print() const; 12062622Sjhb void print_value() const; 12112286Sphk 12262622Sjhb virtual void print_on(outputStream* st) const; 12312286Sphk virtual void print_value_on(outputStream* st) const; 12462622Sjhb}; 12512286Sphk#endif 12662622Sjhb 12751337Sdillon 12812286Sphk/* 12946381Sbillf * Memory types 13046381Sbillf */ 1311541Srgrimesenum MemoryType { 13212286Sphk // Memory type by sub systems. It occupies lower byte. 13362573Sphk mtJavaHeap = 0x00, // Java heap 1341541Srgrimes mtClass = 0x01, // memory class for Java classes 13512286Sphk mtThread = 0x02, // memory for thread objects 13612286Sphk mtThreadStack = 0x03, 13712286Sphk mtCode = 0x04, // memory for generated code 13812286Sphk mtGC = 0x05, // memory for GC 13912286Sphk mtCompiler = 0x06, // memory for compiler 1401541Srgrimes mtInternal = 0x07, // memory used by VM, but does not belong to 1411541Srgrimes // any of above categories, and not used for 14212286Sphk // native memory tracking 1431541Srgrimes mtOther = 0x08, // memory not used by VM 1441541Srgrimes mtSymbol = 0x09, // symbol 1451541Srgrimes mtNMT = 0x0A, // memory used by native memory tracking 1461541Srgrimes mtClassShared = 0x0B, // class data sharing 14715809Sdyson mtChunk = 0x0C, // chunk that holds content of arenas 1485455Sdg mtTest = 0x0D, // Test type for verifying NMT 14915809Sdyson mtTracing = 0x0E, // memory used for Tracing 15038517Sdfr mtLogging = 0x0F, // memory for logging 1511541Srgrimes mtArguments = 0x10, // memory for argument processing 1521541Srgrimes mtModule = 0x11, // memory for module processing 1531541Srgrimes mtNone = 0x12, // undefined 15469947Sjake mt_number_of_types = 0x13 // number of memory types (mtDontTrack 15514531Shsu // is not included as validate type) 1561541Srgrimes}; 1571541Srgrimes 1581541Srgrimestypedef MemoryType MEMFLAGS; 1591541Srgrimes 1601541Srgrimes 1611541Srgrimes#if INCLUDE_NMT 16265557Sjasone 1631541Srgrimesextern bool NMT_track_callsite; 1641541Srgrimes 1651541Srgrimes#else 1661541Srgrimes 1671541Srgrimesconst bool NMT_track_callsite = false; 1681541Srgrimes 1691541Srgrimes#endif // INCLUDE_NMT 1701541Srgrimes 1711541Srgrimesclass NativeCallStack; 1721541Srgrimes 1731541Srgrimes 1741541Srgrimestemplate <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC { 1751541Srgrimes public: 17665557Sjasone NOINLINE void* operator new(size_t size, const NativeCallStack& stack) throw(); 17765557Sjasone NOINLINE void* operator new(size_t size) throw(); 17865557Sjasone NOINLINE void* operator new (size_t size, const std::nothrow_t& nothrow_constant, 17965557Sjasone const NativeCallStack& stack) throw(); 1801541Srgrimes NOINLINE void* operator new (size_t size, const std::nothrow_t& nothrow_constant) 1811541Srgrimes throw(); 1821541Srgrimes NOINLINE void* operator new [](size_t size, const NativeCallStack& stack) throw(); 1831541Srgrimes NOINLINE void* operator new [](size_t size) throw(); 1841541Srgrimes NOINLINE void* operator new [](size_t size, const std::nothrow_t& nothrow_constant, 1851541Srgrimes const NativeCallStack& stack) throw(); 1861541Srgrimes NOINLINE void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) 1871541Srgrimes throw(); 1881541Srgrimes void operator delete(void* p); 1891541Srgrimes void operator delete [] (void* p); 1901541Srgrimes}; 1911541Srgrimes 1921541Srgrimes// Base class for objects allocated on the stack only. 1931541Srgrimes// Calling new or delete will result in fatal error. 1941541Srgrimes 1955455Sdgclass StackObj ALLOCATION_SUPER_CLASS_SPEC { 19643748Sdillon private: 1971541Srgrimes void* operator new(size_t size) throw(); 1981541Srgrimes void* operator new [](size_t size) throw(); 19938517Sdfr#ifdef __IBMCPP__ 2001541Srgrimes public: 2011541Srgrimes#endif 2021541Srgrimes void operator delete(void* p); 2031541Srgrimes void operator delete [](void* p); 2041541Srgrimes}; 20569947Sjake 2061541Srgrimes// Base class for objects used as value objects. 2071541Srgrimes// Calling new or delete will result in fatal error. 2081541Srgrimes// 20915809Sdyson// Portability note: Certain compilers (e.g. gcc) will 2105455Sdg// always make classes bigger if it has a superclass, even 21115809Sdyson// if the superclass does not have any virtual methods or 21242957Sdillon// instance fields. The HotSpot implementation relies on this 21342957Sdillon// not to happen. So never make a ValueObj class a direct subclass 21442957Sdillon// of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g., 21542957Sdillon// like this: 21642957Sdillon// 21718169Sdyson// class A VALUE_OBJ_CLASS_SPEC { 2181541Srgrimes// ... 2191541Srgrimes// } 22018169Sdyson// 2211541Srgrimes// With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can 2221541Srgrimes// be defined as a an empty string "". 22318169Sdyson// 2241541Srgrimesclass _ValueObj { 22518169Sdyson private: 2261541Srgrimes void* operator new(size_t size) throw(); 2271541Srgrimes void operator delete(void* p); 22818169Sdyson void* operator new [](size_t size) throw(); 2291541Srgrimes void operator delete [](void* p); 2301541Srgrimes}; 2311541Srgrimes 2321541Srgrimes 2335455Sdg// Base class for objects stored in Metaspace. 23412286Sphk// Calling delete will result in fatal error. 2351541Srgrimes// 23612286Sphk// Do not inherit from something with a vptr because this class does 23712286Sphk// not introduce one. This class is used to allocate both shared read-only 23846381Sbillf// and shared read-write classes. 23946381Sbillf// 24040794Speter 24140794Speterclass ClassLoaderData; 24240794Speterclass MetaspaceClosure; 24340794Speter 24462622Sjhbclass MetaspaceObj { 24540794Speter public: 24662622Sjhb bool is_metaspace_object() const; 24740794Speter bool is_shared() const; 24862622Sjhb void print_address_on(outputStream* st) const; // nonvirtual address printing 24940794Speter 25062622Sjhb#define METASPACE_OBJ_TYPES_DO(f) \ 25146381Sbillf f(Unknown) \ 25262622Sjhb f(Class) \ 25346381Sbillf f(Symbol) \ 25462622Sjhb f(TypeArrayU1) \ 25540794Speter f(TypeArrayU2) \ 25662622Sjhb f(TypeArrayU4) \ 25740794Speter f(TypeArrayU8) \ 25862622Sjhb f(TypeArrayOther) \ 25940794Speter f(Method) \ 26062622Sjhb f(ConstMethod) \ 26140794Speter f(MethodData) \ 26262622Sjhb f(ConstantPool) \ 26340794Speter f(ConstantPoolCache) \ 26462622Sjhb f(Annotations) \ 26540794Speter f(MethodCounters) 26662622Sjhb 26740794Speter#define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type, 26862622Sjhb#define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name; 26940794Speter 27062622Sjhb enum Type { 27140794Speter // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc 27262622Sjhb METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE) 27340794Speter _number_of_types 27462622Sjhb }; 27540794Speter 27662622Sjhb static const char * type_name(Type type) { 27740794Speter switch(type) { 27862622Sjhb METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE) 27940794Speter default: 28062622Sjhb ShouldNotReachHere(); 28140794Speter return NULL; 28262622Sjhb } 28340794Speter } 28462622Sjhb 28540794Speter static MetaspaceObj::Type array_type(size_t elem_size) { 28662622Sjhb switch (elem_size) { 28740794Speter case 1: return TypeArrayU1Type; 28862622Sjhb case 2: return TypeArrayU2Type; 28940794Speter case 4: return TypeArrayU4Type; 29062622Sjhb case 8: return TypeArrayU8Type; 29140794Speter default: 29262622Sjhb return TypeArrayOtherType; 29340794Speter } 29462622Sjhb } 29540794Speter 29662622Sjhb void* operator new(size_t size, ClassLoaderData* loader_data, 29740794Speter size_t word_size, 29862622Sjhb Type type, Thread* thread) throw(); 29940794Speter // can't use TRAPS from this header file. 30062622Sjhb void operator delete(void* p) { ShouldNotCallThis(); } 30140794Speter 30262622Sjhb // Declare a *static* method with the same signature in any subclass of MetaspaceObj 30340794Speter // that should be read-only by default. See symbol.hpp for an example. This function 30462622Sjhb // is used by the templates in metaspaceClosure.hpp 30540794Speter static bool is_read_only_by_default() { return false; } 30662622Sjhb}; 30740794Speter 30862622Sjhb// Base class for classes that constitute name spaces. 30940794Speter 31062622Sjhbclass AllStatic { 31140794Speter public: 31262622Sjhb AllStatic() { ShouldNotCallThis(); } 31340794Speter ~AllStatic() { ShouldNotCallThis(); } 31462622Sjhb}; 31540794Speter 31662622Sjhb 31740794Speter//------------------------------Chunk------------------------------------------ 31862622Sjhb// Linked list of raw memory chunks 31940794Speterclass Chunk: CHeapObj<mtChunk> { 32062622Sjhb friend class VMStructs; 32140794Speter 32262622Sjhb protected: 32340794Speter Chunk* _next; // Next Chunk in list 32440794Speter const size_t _len; // Size of this Chunk 32540794Speter public: 32640794Speter void* operator new(size_t size, AllocFailType alloc_failmode, size_t length) throw(); 32740794Speter void operator delete(void* p); 32840794Speter Chunk(size_t length); 32940794Speter 33040794Speter enum { 33140794Speter // default sizes; make them slightly smaller than 2**k to guard against 33240794Speter // buddy-system style malloc implementations 33340794Speter#ifdef _LP64 33440794Speter slack = 40, // [RGV] Not sure if this is right, but make it 33540794Speter // a multiple of 8. 33640794Speter#else 33740794Speter slack = 20, // suspected sizeof(Chunk) + internal malloc headers 33840794Speter#endif 33940794Speter 340 tiny_size = 256 - slack, // Size of first chunk (tiny) 341 init_size = 1*K - slack, // Size of first chunk (normal aka small) 342 medium_size= 10*K - slack, // Size of medium-sized chunk 343 size = 32*K - slack, // Default size of an Arena chunk (following the first) 344 non_pool_size = init_size + 32 // An initial size which is not one of above 345 }; 346 347 void chop(); // Chop this chunk 348 void next_chop(); // Chop next chunk 349 static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); } 350 static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); } 351 352 size_t length() const { return _len; } 353 Chunk* next() const { return _next; } 354 void set_next(Chunk* n) { _next = n; } 355 // Boundaries of data area (possibly unused) 356 char* bottom() const { return ((char*) this) + aligned_overhead_size(); } 357 char* top() const { return bottom() + _len; } 358 bool contains(char* p) const { return bottom() <= p && p <= top(); } 359 360 // Start the chunk_pool cleaner task 361 static void start_chunk_pool_cleaner_task(); 362 363 static void clean_chunk_pool(); 364}; 365 366//------------------------------Arena------------------------------------------ 367// Fast allocation of memory 368class Arena : public CHeapObj<mtNone> { 369protected: 370 friend class ResourceMark; 371 friend class HandleMark; 372 friend class NoHandleMark; 373 friend class VMStructs; 374 375 MEMFLAGS _flags; // Memory tracking flags 376 377 Chunk *_first; // First chunk 378 Chunk *_chunk; // current chunk 379 char *_hwm, *_max; // High water mark and max in current chunk 380 // Get a new Chunk of at least size x 381 void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 382 size_t _size_in_bytes; // Size of arena (used for native memory tracking) 383 384 NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start 385 friend class AllocStats; 386 debug_only(void* malloc(size_t size);) 387 debug_only(void* internal_malloc_4(size_t x);) 388 NOT_PRODUCT(void inc_bytes_allocated(size_t x);) 389 390 void signal_out_of_memory(size_t request, const char* whence) const; 391 392 bool check_for_overflow(size_t request, const char* whence, 393 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) const { 394 if (UINTPTR_MAX - request < (uintptr_t)_hwm) { 395 if (alloc_failmode == AllocFailStrategy::RETURN_NULL) { 396 return false; 397 } 398 signal_out_of_memory(request, whence); 399 } 400 return true; 401 } 402 403 public: 404 Arena(MEMFLAGS memflag); 405 Arena(MEMFLAGS memflag, size_t init_size); 406 ~Arena(); 407 void destruct_contents(); 408 char* hwm() const { return _hwm; } 409 410 // new operators 411 void* operator new (size_t size) throw(); 412 void* operator new (size_t size, const std::nothrow_t& nothrow_constant) throw(); 413 414 // dynamic memory type tagging 415 void* operator new(size_t size, MEMFLAGS flags) throw(); 416 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw(); 417 void operator delete(void* p); 418 419 // Fast allocate in the arena. Common case is: pointer test + increment. 420 void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { 421 assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2"); 422 x = ARENA_ALIGN(x); 423 debug_only(if (UseMallocOnly) return malloc(x);) 424 if (!check_for_overflow(x, "Arena::Amalloc", alloc_failmode)) 425 return NULL; 426 NOT_PRODUCT(inc_bytes_allocated(x);) 427 if (_hwm + x > _max) { 428 return grow(x, alloc_failmode); 429 } else { 430 char *old = _hwm; 431 _hwm += x; 432 return old; 433 } 434 } 435 // Further assume size is padded out to words 436 void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { 437 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); 438 debug_only(if (UseMallocOnly) return malloc(x);) 439 if (!check_for_overflow(x, "Arena::Amalloc_4", alloc_failmode)) 440 return NULL; 441 NOT_PRODUCT(inc_bytes_allocated(x);) 442 if (_hwm + x > _max) { 443 return grow(x, alloc_failmode); 444 } else { 445 char *old = _hwm; 446 _hwm += x; 447 return old; 448 } 449 } 450 451 // Allocate with 'double' alignment. It is 8 bytes on sparc. 452 // In other cases Amalloc_D() should be the same as Amalloc_4(). 453 void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { 454 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); 455 debug_only(if (UseMallocOnly) return malloc(x);) 456#if defined(SPARC) && !defined(_LP64) 457#define DALIGN_M1 7 458 size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm; 459 x += delta; 460#endif 461 if (!check_for_overflow(x, "Arena::Amalloc_D", alloc_failmode)) 462 return NULL; 463 NOT_PRODUCT(inc_bytes_allocated(x);) 464 if (_hwm + x > _max) { 465 return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes. 466 } else { 467 char *old = _hwm; 468 _hwm += x; 469#if defined(SPARC) && !defined(_LP64) 470 old += delta; // align to 8-bytes 471#endif 472 return old; 473 } 474 } 475 476 // Fast delete in area. Common case is: NOP (except for storage reclaimed) 477 void Afree(void *ptr, size_t size) { 478#ifdef ASSERT 479 if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory 480 if (UseMallocOnly) return; 481#endif 482 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; 483 } 484 485 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size, 486 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 487 488 // Move contents of this arena into an empty arena 489 Arena *move_contents(Arena *empty_arena); 490 491 // Determine if pointer belongs to this Arena or not. 492 bool contains( const void *ptr ) const; 493 494 // Total of all chunks in use (not thread-safe) 495 size_t used() const; 496 497 // Total # of bytes used 498 size_t size_in_bytes() const { return _size_in_bytes; }; 499 void set_size_in_bytes(size_t size); 500 501 static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN; 502 static void free_all(char** start, char** end) PRODUCT_RETURN; 503 504private: 505 // Reset this Arena to empty, access will trigger grow if necessary 506 void reset(void) { 507 _first = _chunk = NULL; 508 _hwm = _max = NULL; 509 set_size_in_bytes(0); 510 } 511}; 512 513// One of the following macros must be used when allocating 514// an array or object from an arena 515#define NEW_ARENA_ARRAY(arena, type, size) \ 516 (type*) (arena)->Amalloc((size) * sizeof(type)) 517 518#define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \ 519 (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \ 520 (new_size) * sizeof(type) ) 521 522#define FREE_ARENA_ARRAY(arena, type, old, size) \ 523 (arena)->Afree((char*)(old), (size) * sizeof(type)) 524 525#define NEW_ARENA_OBJ(arena, type) \ 526 NEW_ARENA_ARRAY(arena, type, 1) 527 528 529//%note allocation_1 530extern char* resource_allocate_bytes(size_t size, 531 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 532extern char* resource_allocate_bytes(Thread* thread, size_t size, 533 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 534extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size, 535 AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 536extern void resource_free_bytes( char *old, size_t size ); 537 538//---------------------------------------------------------------------- 539// Base class for objects allocated in the resource area per default. 540// Optionally, objects may be allocated on the C heap with 541// new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena) 542// ResourceObj's can be allocated within other objects, but don't use 543// new or delete (allocation_type is unknown). If new is used to allocate, 544// use delete to deallocate. 545class ResourceObj ALLOCATION_SUPER_CLASS_SPEC { 546 public: 547 enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 }; 548 static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN; 549#ifdef ASSERT 550 private: 551 // When this object is allocated on stack the new() operator is not 552 // called but garbage on stack may look like a valid allocation_type. 553 // Store negated 'this' pointer when new() is called to distinguish cases. 554 // Use second array's element for verification value to distinguish garbage. 555 uintptr_t _allocation_t[2]; 556 bool is_type_set() const; 557 public: 558 allocation_type get_allocation_type() const; 559 bool allocated_on_stack() const { return get_allocation_type() == STACK_OR_EMBEDDED; } 560 bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; } 561 bool allocated_on_C_heap() const { return get_allocation_type() == C_HEAP; } 562 bool allocated_on_arena() const { return get_allocation_type() == ARENA; } 563 ResourceObj(); // default constructor 564 ResourceObj(const ResourceObj& r); // default copy constructor 565 ResourceObj& operator=(const ResourceObj& r); // default copy assignment 566 ~ResourceObj(); 567#endif // ASSERT 568 569 public: 570 void* operator new(size_t size, allocation_type type, MEMFLAGS flags) throw(); 571 void* operator new [](size_t size, allocation_type type, MEMFLAGS flags) throw(); 572 void* operator new(size_t size, const std::nothrow_t& nothrow_constant, 573 allocation_type type, MEMFLAGS flags) throw(); 574 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant, 575 allocation_type type, MEMFLAGS flags) throw(); 576 577 void* operator new(size_t size, Arena *arena) throw() { 578 address res = (address)arena->Amalloc(size); 579 DEBUG_ONLY(set_allocation_type(res, ARENA);) 580 return res; 581 } 582 583 void* operator new [](size_t size, Arena *arena) throw() { 584 address res = (address)arena->Amalloc(size); 585 DEBUG_ONLY(set_allocation_type(res, ARENA);) 586 return res; 587 } 588 589 void* operator new(size_t size) throw() { 590 address res = (address)resource_allocate_bytes(size); 591 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);) 592 return res; 593 } 594 595 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { 596 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL); 597 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);) 598 return res; 599 } 600 601 void* operator new [](size_t size) throw() { 602 address res = (address)resource_allocate_bytes(size); 603 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);) 604 return res; 605 } 606 607 void* operator new [](size_t size, const std::nothrow_t& nothrow_constant) throw() { 608 address res = (address)resource_allocate_bytes(size, AllocFailStrategy::RETURN_NULL); 609 DEBUG_ONLY(if (res != NULL) set_allocation_type(res, RESOURCE_AREA);) 610 return res; 611 } 612 613 void operator delete(void* p); 614 void operator delete [](void* p); 615}; 616 617// One of the following macros must be used when allocating an array 618// or object to determine whether it should reside in the C heap on in 619// the resource area. 620 621#define NEW_RESOURCE_ARRAY(type, size)\ 622 (type*) resource_allocate_bytes((size) * sizeof(type)) 623 624#define NEW_RESOURCE_ARRAY_RETURN_NULL(type, size)\ 625 (type*) resource_allocate_bytes((size) * sizeof(type), AllocFailStrategy::RETURN_NULL) 626 627#define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\ 628 (type*) resource_allocate_bytes(thread, (size) * sizeof(type)) 629 630#define NEW_RESOURCE_ARRAY_IN_THREAD_RETURN_NULL(thread, type, size)\ 631 (type*) resource_allocate_bytes(thread, (size) * sizeof(type), AllocFailStrategy::RETURN_NULL) 632 633#define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\ 634 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type)) 635 636#define REALLOC_RESOURCE_ARRAY_RETURN_NULL(type, old, old_size, new_size)\ 637 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type),\ 638 (new_size) * sizeof(type), AllocFailStrategy::RETURN_NULL) 639 640#define FREE_RESOURCE_ARRAY(type, old, size)\ 641 resource_free_bytes((char*)(old), (size) * sizeof(type)) 642 643#define FREE_FAST(old)\ 644 /* nop */ 645 646#define NEW_RESOURCE_OBJ(type)\ 647 NEW_RESOURCE_ARRAY(type, 1) 648 649#define NEW_RESOURCE_OBJ_RETURN_NULL(type)\ 650 NEW_RESOURCE_ARRAY_RETURN_NULL(type, 1) 651 652#define NEW_C_HEAP_ARRAY3(type, size, memflags, pc, allocfail)\ 653 (type*) AllocateHeap((size) * sizeof(type), memflags, pc, allocfail) 654 655#define NEW_C_HEAP_ARRAY2(type, size, memflags, pc)\ 656 (type*) (AllocateHeap((size) * sizeof(type), memflags, pc)) 657 658#define NEW_C_HEAP_ARRAY(type, size, memflags)\ 659 (type*) (AllocateHeap((size) * sizeof(type), memflags)) 660 661#define NEW_C_HEAP_ARRAY2_RETURN_NULL(type, size, memflags, pc)\ 662 NEW_C_HEAP_ARRAY3(type, (size), memflags, pc, AllocFailStrategy::RETURN_NULL) 663 664#define NEW_C_HEAP_ARRAY_RETURN_NULL(type, size, memflags)\ 665 NEW_C_HEAP_ARRAY3(type, (size), memflags, CURRENT_PC, AllocFailStrategy::RETURN_NULL) 666 667#define REALLOC_C_HEAP_ARRAY(type, old, size, memflags)\ 668 (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags)) 669 670#define REALLOC_C_HEAP_ARRAY_RETURN_NULL(type, old, size, memflags)\ 671 (type*) (ReallocateHeap((char*)(old), (size) * sizeof(type), memflags, AllocFailStrategy::RETURN_NULL)) 672 673#define FREE_C_HEAP_ARRAY(type, old) \ 674 FreeHeap((char*)(old)) 675 676// allocate type in heap without calling ctor 677#define NEW_C_HEAP_OBJ(type, memflags)\ 678 NEW_C_HEAP_ARRAY(type, 1, memflags) 679 680#define NEW_C_HEAP_OBJ_RETURN_NULL(type, memflags)\ 681 NEW_C_HEAP_ARRAY_RETURN_NULL(type, 1, memflags) 682 683// deallocate obj of type in heap without calling dtor 684#define FREE_C_HEAP_OBJ(objname)\ 685 FreeHeap((char*)objname); 686 687// for statistics 688#ifndef PRODUCT 689class AllocStats : StackObj { 690 julong start_mallocs, start_frees; 691 julong start_malloc_bytes, start_mfree_bytes, start_res_bytes; 692 public: 693 AllocStats(); 694 695 julong num_mallocs(); // since creation of receiver 696 julong alloc_bytes(); 697 julong num_frees(); 698 julong free_bytes(); 699 julong resource_bytes(); 700 void print(); 701}; 702#endif 703 704 705//------------------------------ReallocMark--------------------------------- 706// Code which uses REALLOC_RESOURCE_ARRAY should check an associated 707// ReallocMark, which is declared in the same scope as the reallocated 708// pointer. Any operation that could __potentially__ cause a reallocation 709// should check the ReallocMark. 710class ReallocMark: public StackObj { 711protected: 712 NOT_PRODUCT(int _nesting;) 713 714public: 715 ReallocMark() PRODUCT_RETURN; 716 void check() PRODUCT_RETURN; 717}; 718 719// Helper class to allocate arrays that may become large. 720// Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit 721// and uses mapped memory for larger allocations. 722// Most OS mallocs do something similar but Solaris malloc does not revert 723// to mapped memory for large allocations. By default ArrayAllocatorMallocLimit 724// is set so that we always use malloc except for Solaris where we set the 725// limit to get mapped memory. 726template <class E> 727class ArrayAllocator : public AllStatic { 728 private: 729 static bool should_use_malloc(size_t length); 730 731 static E* allocate_malloc(size_t length, MEMFLAGS flags); 732 static E* allocate_mmap(size_t length, MEMFLAGS flags); 733 734 static void free_malloc(E* addr, size_t length); 735 static void free_mmap(E* addr, size_t length); 736 737 public: 738 static E* allocate(size_t length, MEMFLAGS flags); 739 static E* reallocate(E* old_addr, size_t old_length, size_t new_length, MEMFLAGS flags); 740 static void free(E* addr, size_t length); 741}; 742 743// Uses mmaped memory for all allocations. All allocations are initially 744// zero-filled. No pre-touching. 745template <class E> 746class MmapArrayAllocator : public AllStatic { 747 private: 748 static size_t size_for(size_t length); 749 750 public: 751 static E* allocate_or_null(size_t length, MEMFLAGS flags); 752 static E* allocate(size_t length, MEMFLAGS flags); 753 static void free(E* addr, size_t length); 754}; 755 756// Uses malloc:ed memory for all allocations. 757template <class E> 758class MallocArrayAllocator : public AllStatic { 759 public: 760 static size_t size_for(size_t length); 761 762 static E* allocate(size_t length, MEMFLAGS flags); 763 static void free(E* addr, size_t length); 764}; 765 766#endif // SHARE_VM_MEMORY_ALLOCATION_HPP 767