| /* |
| * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_ARENA_HPP |
| #define SHARE_VM_ARENA_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "runtime/globals.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| |
| #include <new> |
| |
| // The byte alignment to be used by Arena::Amalloc. See bugid 4169348. |
| // Note: this value must be a power of 2 |
| |
| #define ARENA_AMALLOC_ALIGNMENT (2*BytesPerWord) |
| |
| #define ARENA_ALIGN_M1 (((size_t)(ARENA_AMALLOC_ALIGNMENT)) - 1) |
| #define ARENA_ALIGN_MASK (~((size_t)ARENA_ALIGN_M1)) |
| #define ARENA_ALIGN(x) ((((size_t)(x)) + ARENA_ALIGN_M1) & ARENA_ALIGN_MASK) |
| |
| //------------------------------Chunk------------------------------------------ |
| // Linked list of raw memory chunks |
| class Chunk: CHeapObj<mtChunk> { |
| |
| private: |
| Chunk* _next; // Next Chunk in list |
| const size_t _len; // Size of this Chunk |
| public: |
| void* operator new(size_t size, AllocFailType alloc_failmode, size_t length) throw(); |
| void operator delete(void* p); |
| Chunk(size_t length); |
| |
| enum { |
| // default sizes; make them slightly smaller than 2**k to guard against |
| // buddy-system style malloc implementations |
| #ifdef _LP64 |
| slack = 40, // [RGV] Not sure if this is right, but make it |
| // a multiple of 8. |
| #else |
| slack = 20, // suspected sizeof(Chunk) + internal malloc headers |
| #endif |
| |
| tiny_size = 256 - slack, // Size of first chunk (tiny) |
| init_size = 1*K - slack, // Size of first chunk (normal aka small) |
| medium_size= 10*K - slack, // Size of medium-sized chunk |
| size = 32*K - slack, // Default size of an Arena chunk (following the first) |
| non_pool_size = init_size + 32 // An initial size which is not one of above |
| }; |
| |
| void chop(); // Chop this chunk |
| void next_chop(); // Chop next chunk |
| static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); } |
| static size_t aligned_overhead_size(size_t byte_size) { return ARENA_ALIGN(byte_size); } |
| |
| size_t length() const { return _len; } |
| Chunk* next() const { return _next; } |
| void set_next(Chunk* n) { _next = n; } |
| // Boundaries of data area (possibly unused) |
| char* bottom() const { return ((char*) this) + aligned_overhead_size(); } |
| char* top() const { return bottom() + _len; } |
| bool contains(char* p) const { return bottom() <= p && p <= top(); } |
| |
| // Start the chunk_pool cleaner task |
| static void start_chunk_pool_cleaner_task(); |
| |
| static void clean_chunk_pool(); |
| }; |
| |
| //------------------------------Arena------------------------------------------ |
| // Fast allocation of memory |
| class Arena : public CHeapObj<mtNone> { |
| protected: |
| friend class ResourceMark; |
| friend class HandleMark; |
| friend class NoHandleMark; |
| friend class VMStructs; |
| |
| MEMFLAGS _flags; // Memory tracking flags |
| |
| Chunk *_first; // First chunk |
| Chunk *_chunk; // current chunk |
| char *_hwm, *_max; // High water mark and max in current chunk |
| // Get a new Chunk of at least size x |
| void* grow(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); |
| size_t _size_in_bytes; // Size of arena (used for native memory tracking) |
| |
| NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start |
| friend class AllocStats; |
| debug_only(void* malloc(size_t size);) |
| debug_only(void* internal_malloc_4(size_t x);) |
| NOT_PRODUCT(void inc_bytes_allocated(size_t x);) |
| |
| void signal_out_of_memory(size_t request, const char* whence) const; |
| |
| bool check_for_overflow(size_t request, const char* whence, |
| AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) const { |
| if (UINTPTR_MAX - request < (uintptr_t)_hwm) { |
| if (alloc_failmode == AllocFailStrategy::RETURN_NULL) { |
| return false; |
| } |
| signal_out_of_memory(request, whence); |
| } |
| return true; |
| } |
| |
| public: |
| Arena(MEMFLAGS memflag); |
| Arena(MEMFLAGS memflag, size_t init_size); |
| ~Arena(); |
| void destruct_contents(); |
| char* hwm() const { return _hwm; } |
| |
| // new operators |
| void* operator new (size_t size) throw(); |
| void* operator new (size_t size, const std::nothrow_t& nothrow_constant) throw(); |
| |
| // dynamic memory type tagging |
| void* operator new(size_t size, MEMFLAGS flags) throw(); |
| void* operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw(); |
| void operator delete(void* p); |
| |
| // Fast allocate in the arena. Common case is: pointer test + increment. |
| void* Amalloc(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { |
| assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2"); |
| x = ARENA_ALIGN(x); |
| debug_only(if (UseMallocOnly) return malloc(x);) |
| if (!check_for_overflow(x, "Arena::Amalloc", alloc_failmode)) |
| return NULL; |
| NOT_PRODUCT(inc_bytes_allocated(x);) |
| if (_hwm + x > _max) { |
| return grow(x, alloc_failmode); |
| } else { |
| char *old = _hwm; |
| _hwm += x; |
| return old; |
| } |
| } |
| // Further assume size is padded out to words |
| void *Amalloc_4(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { |
| assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); |
| debug_only(if (UseMallocOnly) return malloc(x);) |
| if (!check_for_overflow(x, "Arena::Amalloc_4", alloc_failmode)) |
| return NULL; |
| NOT_PRODUCT(inc_bytes_allocated(x);) |
| if (_hwm + x > _max) { |
| return grow(x, alloc_failmode); |
| } else { |
| char *old = _hwm; |
| _hwm += x; |
| return old; |
| } |
| } |
| |
| // Allocate with 'double' alignment. It is 8 bytes on sparc. |
| // In other cases Amalloc_D() should be the same as Amalloc_4(). |
| void* Amalloc_D(size_t x, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { |
| assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); |
| debug_only(if (UseMallocOnly) return malloc(x);) |
| #if defined(SPARC) && !defined(_LP64) |
| #define DALIGN_M1 7 |
| size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm; |
| x += delta; |
| #endif |
| if (!check_for_overflow(x, "Arena::Amalloc_D", alloc_failmode)) |
| return NULL; |
| NOT_PRODUCT(inc_bytes_allocated(x);) |
| if (_hwm + x > _max) { |
| return grow(x, alloc_failmode); // grow() returns a result aligned >= 8 bytes. |
| } else { |
| char *old = _hwm; |
| _hwm += x; |
| #if defined(SPARC) && !defined(_LP64) |
| old += delta; // align to 8-bytes |
| #endif |
| return old; |
| } |
| } |
| |
| // Fast delete in area. Common case is: NOP (except for storage reclaimed) |
| void Afree(void *ptr, size_t size) { |
| if (ptr == NULL) { |
| return; // as with free(3), freeing NULL is a noop. |
| } |
| #ifdef ASSERT |
| if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory |
| if (UseMallocOnly) return; |
| #endif |
| if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; |
| } |
| |
| void *Arealloc( void *old_ptr, size_t old_size, size_t new_size, |
| AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); |
| |
| // Move contents of this arena into an empty arena |
| Arena *move_contents(Arena *empty_arena); |
| |
| // Determine if pointer belongs to this Arena or not. |
| bool contains( const void *ptr ) const; |
| |
| // Total of all chunks in use (not thread-safe) |
| size_t used() const; |
| |
| // Total # of bytes used |
| size_t size_in_bytes() const { return _size_in_bytes; }; |
| void set_size_in_bytes(size_t size); |
| |
| static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN; |
| static void free_all(char** start, char** end) PRODUCT_RETURN; |
| |
| private: |
| // Reset this Arena to empty, access will trigger grow if necessary |
| void reset(void) { |
| _first = _chunk = NULL; |
| _hwm = _max = NULL; |
| set_size_in_bytes(0); |
| } |
| }; |
| |
| // One of the following macros must be used when allocating |
| // an array or object from an arena |
| #define NEW_ARENA_ARRAY(arena, type, size) \ |
| (type*) (arena)->Amalloc((size) * sizeof(type)) |
| |
| #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \ |
| (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \ |
| (new_size) * sizeof(type) ) |
| |
| #define FREE_ARENA_ARRAY(arena, type, old, size) \ |
| (arena)->Afree((char*)(old), (size) * sizeof(type)) |
| |
| #define NEW_ARENA_OBJ(arena, type) \ |
| NEW_ARENA_ARRAY(arena, type, 1) |
| |
| #endif // SHARE_VM_ARENA_HPP |