/**
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* \file
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* Internal lock-free memory allocator.
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*
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* Copyright (C) 2012 Xamarin Inc
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*
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* Licensed under the MIT license. See LICENSE file in the project root for full license information.
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*/
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#include "config.h"
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#ifdef HAVE_SGEN_GC
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#include <string.h>
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#include "mono/sgen/sgen-gc.h"
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#include "mono/utils/lock-free-alloc.h"
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#include "mono/sgen/sgen-memory-governor.h"
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#include "mono/sgen/sgen-client.h"
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/*
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* When allocating sgen memory we choose the allocator with the smallest slot size
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* that can fit our requested size. These slots are allocated within a block that
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* can contain at least 2 slots of the specific size.
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*
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* Currently, slots from 8 to 2044/2040 are allocated inside 4096 sized blocks,
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* 2728 to 4092/4088 inside 8192 sized blocks, and higher inside 16384 sized
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* blocks. We also need to make sure the slots are pointer size aligned so we
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* don't allocate unaligned memory.
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*
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* The computation of these sizes spawns from two basic rules :
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* - if we use slots of size s1 that fit n times in a block, it is illogical
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* to use another slot of size s2 which also fits the same n times in a block.
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* - if we use slots of size s1 that fit n times in a block, there is no
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* s2 > s1 that can fit n times in the block. That would mean we are wasting memory
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* when allocating size S where s1 < S <= s2.
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*/
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#if SIZEOF_VOID_P == 4
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static const int allocator_sizes [] = {
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8, 16, 24, 32, 40, 48, 64, 80,
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96, 124, 160, 192, 224, 252, 292, 340,
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408, 452, 508, 584, 680, 816, 1020,
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1364, 2044, 2728, 4092, 5460, 8188 };
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#else
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static const int allocator_sizes [] = {
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8, 16, 24, 32, 40, 48, 64, 80,
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96, 128, 160, 192, 224, 248, 288, 336,
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368, 448, 504, 584, 680, 816, 1016,
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1360, 2040, 2728, 4088, 5456, 8184 };
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#endif
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#define NUM_ALLOCATORS (sizeof (allocator_sizes) / sizeof (int))
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static int allocator_block_sizes [NUM_ALLOCATORS];
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static MonoLockFreeAllocSizeClass size_classes [NUM_ALLOCATORS];
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static MonoLockFreeAllocator allocators [NUM_ALLOCATORS];
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#ifdef HEAVY_STATISTICS
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static int allocator_sizes_stats [NUM_ALLOCATORS];
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#endif
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static size_t
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block_size (size_t slot_size)
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{
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static int pagesize = -1;
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int size;
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size_t aligned_slot_size = SGEN_ALIGN_UP_TO (slot_size, SIZEOF_VOID_P);
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if (pagesize == -1)
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pagesize = mono_pagesize ();
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for (size = pagesize; size < LOCK_FREE_ALLOC_SB_MAX_SIZE; size <<= 1) {
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if (aligned_slot_size * 2 <= LOCK_FREE_ALLOC_SB_USABLE_SIZE (size))
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return size;
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}
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return LOCK_FREE_ALLOC_SB_MAX_SIZE;
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}
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/*
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* Find the allocator index for memory chunks that can contain @size
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* objects.
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*/
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static int
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index_for_size (size_t size)
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{
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int slot;
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/* do a binary search or lookup table later. */
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for (slot = 0; slot < NUM_ALLOCATORS; ++slot) {
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if (allocator_sizes [slot] >= size)
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return slot;
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}
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g_assert_not_reached ();
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return -1;
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}
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/*
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* Allocator indexes for the fixed INTERNAL_MEM_XXX types. -1 if that
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* type is dynamic.
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*/
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static int fixed_type_allocator_indexes [INTERNAL_MEM_MAX];
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void
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sgen_register_fixed_internal_mem_type (int type, size_t size)
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{
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int slot;
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g_assert (type >= 0 && type < INTERNAL_MEM_MAX);
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g_assert (size <= allocator_sizes [NUM_ALLOCATORS - 1]);
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slot = index_for_size (size);
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g_assert (slot >= 0);
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if (fixed_type_allocator_indexes [type] == -1)
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fixed_type_allocator_indexes [type] = slot;
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else {
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if (fixed_type_allocator_indexes [type] != slot)
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g_error ("Invalid double registration of type %d old slot %d new slot %d", type, fixed_type_allocator_indexes [type], slot);
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}
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}
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static const char*
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description_for_type (int type)
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{
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switch (type) {
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case INTERNAL_MEM_PIN_QUEUE: return "pin-queue";
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case INTERNAL_MEM_FRAGMENT: return "fragment";
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case INTERNAL_MEM_SECTION: return "section";
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case INTERNAL_MEM_SCAN_STARTS: return "scan-starts";
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case INTERNAL_MEM_FIN_TABLE: return "fin-table";
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case INTERNAL_MEM_FINALIZE_ENTRY: return "finalize-entry";
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case INTERNAL_MEM_FINALIZE_READY: return "finalize-ready";
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case INTERNAL_MEM_DISLINK_TABLE: return "dislink-table";
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case INTERNAL_MEM_DISLINK: return "dislink";
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case INTERNAL_MEM_ROOTS_TABLE: return "roots-table";
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case INTERNAL_MEM_ROOT_RECORD: return "root-record";
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case INTERNAL_MEM_STATISTICS: return "statistics";
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case INTERNAL_MEM_STAT_PINNED_CLASS: return "pinned-class";
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case INTERNAL_MEM_STAT_REMSET_CLASS: return "remset-class";
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case INTERNAL_MEM_GRAY_QUEUE: return "gray-queue";
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case INTERNAL_MEM_MS_TABLES: return "marksweep-tables";
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case INTERNAL_MEM_MS_BLOCK_INFO: return "marksweep-block-info";
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case INTERNAL_MEM_MS_BLOCK_INFO_SORT: return "marksweep-block-info-sort";
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case INTERNAL_MEM_WORKER_DATA: return "worker-data";
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case INTERNAL_MEM_THREAD_POOL_JOB: return "thread-pool-job";
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case INTERNAL_MEM_BRIDGE_DATA: return "bridge-data";
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case INTERNAL_MEM_OLD_BRIDGE_HASH_TABLE: return "old-bridge-hash-table";
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case INTERNAL_MEM_OLD_BRIDGE_HASH_TABLE_ENTRY: return "old-bridge-hash-table-entry";
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case INTERNAL_MEM_BRIDGE_HASH_TABLE: return "bridge-hash-table";
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case INTERNAL_MEM_BRIDGE_HASH_TABLE_ENTRY: return "bridge-hash-table-entry";
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case INTERNAL_MEM_TARJAN_BRIDGE_HASH_TABLE: return "tarjan-bridge-hash-table";
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case INTERNAL_MEM_TARJAN_BRIDGE_HASH_TABLE_ENTRY: return "tarjan-bridge-hash-table-entry";
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case INTERNAL_MEM_TARJAN_OBJ_BUCKET: return "tarjan-bridge-object-buckets";
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case INTERNAL_MEM_BRIDGE_ALIVE_HASH_TABLE: return "bridge-alive-hash-table";
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case INTERNAL_MEM_BRIDGE_ALIVE_HASH_TABLE_ENTRY: return "bridge-alive-hash-table-entry";
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case INTERNAL_MEM_BRIDGE_DEBUG: return "bridge-debug";
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case INTERNAL_MEM_TOGGLEREF_DATA: return "toggleref-data";
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case INTERNAL_MEM_CARDTABLE_MOD_UNION: return "cardtable-mod-union";
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case INTERNAL_MEM_BINARY_PROTOCOL: return "binary-protocol";
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case INTERNAL_MEM_TEMPORARY: return "temporary";
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case INTERNAL_MEM_LOG_ENTRY: return "log-entry";
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case INTERNAL_MEM_COMPLEX_DESCRIPTORS: return "complex-descriptors";
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default: {
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const char *description = sgen_client_description_for_internal_mem_type (type);
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SGEN_ASSERT (0, description, "Unknown internal mem type");
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return description;
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}
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}
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}
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void*
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sgen_alloc_internal_dynamic (size_t size, int type, gboolean assert_on_failure)
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{
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int index;
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void *p;
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if (size > allocator_sizes [NUM_ALLOCATORS - 1]) {
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p = sgen_alloc_os_memory (size, (SgenAllocFlags)(SGEN_ALLOC_INTERNAL | SGEN_ALLOC_ACTIVATE), NULL, MONO_MEM_ACCOUNT_SGEN_INTERNAL);
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if (!p)
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sgen_assert_memory_alloc (NULL, size, description_for_type (type));
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} else {
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index = index_for_size (size);
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#ifdef HEAVY_STATISTICS
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++ allocator_sizes_stats [index];
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#endif
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p = mono_lock_free_alloc (&allocators [index]);
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if (!p)
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sgen_assert_memory_alloc (NULL, size, description_for_type (type));
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memset (p, 0, size);
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}
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SGEN_ASSERT (0, !(((mword)p) & (sizeof(gpointer) - 1)), "Why do we allocate unaligned addresses ?");
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return p;
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}
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void
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sgen_free_internal_dynamic (void *addr, size_t size, int type)
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{
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if (!addr)
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return;
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if (size > allocator_sizes [NUM_ALLOCATORS - 1])
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sgen_free_os_memory (addr, size, SGEN_ALLOC_INTERNAL, MONO_MEM_ACCOUNT_SGEN_INTERNAL);
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else
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mono_lock_free_free (addr, block_size (size));
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}
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void*
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sgen_alloc_internal (int type)
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{
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int index, size;
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void *p;
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index = fixed_type_allocator_indexes [type];
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g_assert (index >= 0 && index < NUM_ALLOCATORS);
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#ifdef HEAVY_STATISTICS
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++ allocator_sizes_stats [index];
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#endif
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size = allocator_sizes [index];
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p = mono_lock_free_alloc (&allocators [index]);
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memset (p, 0, size);
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SGEN_ASSERT (0, !(((mword)p) & (sizeof(gpointer) - 1)), "Why do we allocate unaligned addresses ?");
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return p;
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}
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void
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sgen_free_internal (void *addr, int type)
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{
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int index;
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if (!addr)
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return;
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index = fixed_type_allocator_indexes [type];
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g_assert (index >= 0 && index < NUM_ALLOCATORS);
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mono_lock_free_free (addr, allocator_block_sizes [index]);
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}
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void
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sgen_dump_internal_mem_usage (FILE *heap_dump_file)
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{
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/*
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int i;
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fprintf (heap_dump_file, "<other-mem-usage type=\"large-internal\" size=\"%lld\"/>\n", large_internal_bytes_alloced);
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fprintf (heap_dump_file, "<other-mem-usage type=\"pinned-chunks\" size=\"%lld\"/>\n", pinned_chunk_bytes_alloced);
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for (i = 0; i < INTERNAL_MEM_MAX; ++i) {
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fprintf (heap_dump_file, "<other-mem-usage type=\"%s\" size=\"%ld\"/>\n",
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description_for_type (i), unmanaged_allocator.small_internal_mem_bytes [i]);
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}
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*/
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}
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void
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sgen_report_internal_mem_usage (void)
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{
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int i G_GNUC_UNUSED;
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#ifdef HEAVY_STATISTICS
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printf ("size -> # allocations\n");
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for (i = 0; i < NUM_ALLOCATORS; ++i)
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printf ("%d -> %d\n", allocator_sizes [i], allocator_sizes_stats [i]);
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#endif
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}
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void
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sgen_init_internal_allocator (void)
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{
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int i, size;
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for (i = 0; i < INTERNAL_MEM_MAX; ++i)
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fixed_type_allocator_indexes [i] = -1;
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for (i = 0; i < NUM_ALLOCATORS; ++i) {
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allocator_block_sizes [i] = block_size (allocator_sizes [i]);
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mono_lock_free_allocator_init_size_class (&size_classes [i], allocator_sizes [i], allocator_block_sizes [i]);
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mono_lock_free_allocator_init_allocator (&allocators [i], &size_classes [i], MONO_MEM_ACCOUNT_SGEN_INTERNAL);
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}
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for (size = mono_pagesize (); size <= LOCK_FREE_ALLOC_SB_MAX_SIZE; size <<= 1) {
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int max_size = (LOCK_FREE_ALLOC_SB_USABLE_SIZE (size) / 2) & ~(SIZEOF_VOID_P - 1);
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/*
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* we assert that allocator_sizes contains the biggest possible object size
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* per block which has to be an aligned address.
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* (4K => 2040, 8k => 4088, 16k => 8184 on 64bits),
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* so that we do not get different block sizes for sizes that should go to the same one
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*/
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g_assert (allocator_sizes [index_for_size (max_size)] == max_size);
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g_assert (block_size (max_size) == size);
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if (size < LOCK_FREE_ALLOC_SB_MAX_SIZE)
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g_assert (block_size (max_size + 1) == size << 1);
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}
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}
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#endif
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