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