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mimalloc/include/mimalloc-types.h

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/* ----------------------------------------------------------------------------
Copyright (c) 2018, Microsoft Research, Daan Leijen
This is free software; you can redistribute it and/or modify it under the
terms of the MIT license. A copy of the license can be found in the file
"LICENSE" at the root of this distribution.
-----------------------------------------------------------------------------*/
#pragma once
#ifndef MIMALLOC_TYPES_H
#define MIMALLOC_TYPES_H
#include <stdlib.h> // size_t etc.
#include <stddef.h> // ptrdiff_t
#include <stdint.h> // uintptr_t, uint16_t, etc
// ------------------------------------------------------
// Variants
// ------------------------------------------------------
// Define NDEBUG in the release version to disable assertions.
// #define NDEBUG
// Define MI_STAT as 1 to maintain statistics; set it to 2 to have detailed statistics (but costs some performance).
// #define MI_STAT 1
// Define MI_SECURE as 1 to encode free lists
// #define MI_SECURE 1
#if !defined(MI_SECURE)
#define MI_SECURE 0
#endif
// Define MI_DEBUG as 1 for basic assert checks and statistics
// set it to 2 to do internal asserts,
// and to 3 to do extensive invariant checking.
#if !defined(MI_DEBUG)
#if !defined(NDEBUG) || defined(_DEBUG)
#define MI_DEBUG 1
#else
#define MI_DEBUG 0
#endif
#endif
// ------------------------------------------------------
// Platform specific values
// ------------------------------------------------------
// ------------------------------------------------------
// Size of a pointer.
// We assume that `sizeof(void*)==sizeof(intptr_t)`
// and it holds for all platforms we know of.
//
// However, the C standard only requires that:
// p == (void*)((intptr_t)p))
// but we also need:
// i == (intptr_t)((void*)i)
// or otherwise one might define an intptr_t type that is larger than a pointer...
// ------------------------------------------------------
#if INTPTR_MAX == 9223372036854775807LL
# define MI_INTPTR_SHIFT (3)
#elif INTPTR_MAX == 2147483647LL
# define MI_INTPTR_SHIFT (2)
#else
#error platform must be 32 or 64 bits
#endif
#define MI_INTPTR_SIZE (1<<MI_INTPTR_SHIFT)
// ------------------------------------------------------
// Main internal data-structures
// ------------------------------------------------------
// Main tuning parameters for segment and page sizes
// Sizes for 64-bit, divide by two for 32-bit
#define MI_SMALL_PAGE_SHIFT (13 + MI_INTPTR_SHIFT) // 64kb
#define MI_LARGE_PAGE_SHIFT ( 6 + MI_SMALL_PAGE_SHIFT) // 4mb
#define MI_SEGMENT_SHIFT ( MI_LARGE_PAGE_SHIFT) // 4mb
// Derived constants
#define MI_SEGMENT_SIZE (1<<MI_SEGMENT_SHIFT)
#define MI_SEGMENT_MASK ((uintptr_t)MI_SEGMENT_SIZE - 1)
#define MI_SMALL_PAGE_SIZE (1<<MI_SMALL_PAGE_SHIFT)
#define MI_LARGE_PAGE_SIZE (1<<MI_LARGE_PAGE_SHIFT)
#define MI_SMALL_PAGES_PER_SEGMENT (MI_SEGMENT_SIZE/MI_SMALL_PAGE_SIZE)
#define MI_LARGE_PAGES_PER_SEGMENT (MI_SEGMENT_SIZE/MI_LARGE_PAGE_SIZE)
#define MI_LARGE_SIZE_MAX (MI_LARGE_PAGE_SIZE/8) // 512kb on 64-bit
#define MI_LARGE_WSIZE_MAX (MI_LARGE_SIZE_MAX>>MI_INTPTR_SHIFT)
// Maximum number of size classes. (spaced exponentially in 16.7% increments)
#define MI_BIN_HUGE (64U)
// Minimal alignment necessary. On most platforms 16 bytes are needed
// due to SSE registers for example. This must be at least `MI_INTPTR_SIZE`
#define MI_MAX_ALIGN_SIZE 16 // sizeof(max_align_t)
#if (MI_LARGE_WSIZE_MAX > 131072)
#error "define more bins"
#endif
typedef uintptr_t mi_encoded_t;
// free lists contain blocks
typedef struct mi_block_s {
mi_encoded_t next;
} mi_block_t;
typedef enum mi_delayed_e {
MI_NO_DELAYED_FREE = 0,
MI_USE_DELAYED_FREE,
MI_DELAYED_FREEING
} mi_delayed_t;
typedef union mi_page_flags_u {
uint16_t value;
struct {
bool has_aligned;
bool in_full;
};
} mi_page_flags_t;
// Thread free list.
// We use 2 bits of the pointer for the `use_delayed_free` and `delayed_freeing` flags.
typedef union mi_thread_free_u {
volatile uintptr_t value;
struct {
mi_delayed_t delayed:2;
#if MI_INTPTR_SIZE==8
uintptr_t head:62; // head free block in the list (right-shifted by 2)
#elif MI_INTPTR_SIZE==4
uintptr_t head:30;
#endif
};
} mi_thread_free_t;
#define MI_TF_PTR_SHIFT (2)
// A page contains blocks of one specific size (`block_size`).
// Each page has three list of free blocks:
// `free` for blocks that can be allocated,
// `local_free` for freed blocks that are not yet available to `mi_malloc`
// `thread_free` for freed blocks by other threads
// The `local_free` and `thread_free` lists are migrated to the `free` list
// when it is exhausted. The separate `local_free` list is necessary to
// implement a monotonic heartbeat. The `thread_free` list is needed for
// avoiding atomic operations in the common case.
//
// `used - thread_freed` == actual blocks that are in use (alive)
// `used - thread_freed + |free| + |local_free| == capacity`
//
// note: we don't count `freed` (as |free|) instead of `used` to reduce
// the number of memory accesses in the `mi_page_all_free` function(s).
// note: the funny layout here is due to:
// - access is optimized for `mi_free` and `mi_page_alloc`
// - using `uint16_t` does not seem to slow things down
typedef struct mi_page_s {
// "owned" by the segment
uint8_t segment_idx; // index in the segment `pages` array, `page == &segment->pages[page->segment_idx]`
bool segment_in_use:1; // `true` if the segment allocated this page
bool is_reset:1; // `true` if the page memory was reset
// layout like this to optimize access in `mi_malloc` and `mi_free`
mi_page_flags_t flags;
uint16_t capacity; // number of blocks committed
uint16_t reserved; // numbes of blocks reserved in memory
mi_block_t* free; // list of available free blocks (`malloc` allocates from this list)
uintptr_t cookie; // random cookie to encode the free lists
size_t used; // number of blocks in use (including blocks in `local_free` and `thread_free`)
mi_block_t* local_free; // list of deferred free blocks by this thread (migrates to `free`)
volatile uintptr_t thread_freed; // at least this number of blocks are in `thread_free`
volatile mi_thread_free_t thread_free; // list of deferred free blocks freed by other threads
// less accessed info
size_t block_size; // size available in each block (always `>0`)
mi_heap_t* heap; // the owning heap
struct mi_page_s* next; // next page owned by this thread with the same `block_size`
struct mi_page_s* prev; // previous page owned by this thread with the same `block_size`
// improve page index calculation
#if MI_INTPTR_SIZE==8
//void* padding[1]; // 10 words on 64-bit
#elif MI_INTPTR_SIZE==4
void* padding[1]; // 12 words on 32-bit
#endif
} mi_page_t;
typedef enum mi_page_kind_e {
MI_PAGE_SMALL, // small blocks go into 64kb pages inside a segment
MI_PAGE_LARGE, // larger blocks go into a single page spanning a whole segment
MI_PAGE_HUGE // huge blocks (>512kb) are put into a single page in a segment of the exact size (but still 2mb aligned)
} mi_page_kind_t;
// Segments are large allocated memory blocks (2mb on 64 bit) from
// the OS. Inside segments we allocated fixed size _pages_ that
// contain blocks.
typedef struct mi_segment_s {
struct mi_segment_s* next;
struct mi_segment_s* prev;
struct mi_segment_s* abandoned_next;
size_t abandoned; // abandoned pages (i.e. the original owning thread stopped) (`abandoned <= used`)
size_t used; // count of pages in use (`used <= capacity`)
size_t capacity; // count of available pages (`#free + used`)
size_t segment_size;// for huge pages this may be different from `MI_SEGMENT_SIZE`
size_t segment_info_size; // space we are using from the first page for segment meta-data and possible guard pages.
uintptr_t cookie; // verify addresses in debug mode: `mi_ptr_cookie(segment) == segment->cookie`
// layout like this to optimize access in `mi_free`
size_t page_shift; // `1 << page_shift` == the page sizes == `page->block_size * page->reserved` (unless the first page, then `-segment_info_size`).
uintptr_t thread_id; // unique id of the thread owning this segment
mi_page_kind_t page_kind; // kind of pages: small, large, or huge
mi_page_t pages[1]; // up to `MI_SMALL_PAGES_PER_SEGMENT` pages
} mi_segment_t;
// ------------------------------------------------------
// Heaps
// Provide first-class heaps to allocate from.
// A heap just owns a set of pages for allocation and
// can only be allocate/reallocate from the thread that created it.
// Freeing blocks can be done from any thread though.
// Per thread, the segments are shared among its heaps.
// Per thread, there is always a default heap that is
// used for allocation; it is initialized to statically
// point to an empty heap to avoid initialization checks
// in the fast path.
// ------------------------------------------------------
// Thread local data
typedef struct mi_tld_s mi_tld_t;
// Pages of a certain block size are held in a queue.
typedef struct mi_page_queue_s {
mi_page_t* first;
mi_page_t* last;
size_t block_size;
} mi_page_queue_t;
#define MI_BIN_FULL (MI_BIN_HUGE+1)
// A heap owns a set of pages.
struct mi_heap_s {
mi_tld_t* tld;
mi_page_t* pages_free_direct[MI_SMALL_WSIZE_MAX + 2]; // optimize: array where every entry points a page with possibly free blocks in the corresponding queue for that size.
mi_page_queue_t pages[MI_BIN_FULL + 1]; // queue of pages for each size class (or "bin")
volatile mi_block_t* thread_delayed_free;
uintptr_t thread_id; // thread this heap belongs too
uintptr_t cookie;
uintptr_t random; // random number used for secure allocation
size_t page_count; // total number of pages in the `pages` queues.
bool no_reclaim; // `true` if this heap should not reclaim abandoned pages
};
// ------------------------------------------------------
// Debug
// ------------------------------------------------------
#define MI_DEBUG_UNINIT (0xD0)
#define MI_DEBUG_FREED (0xDF)
#if (MI_DEBUG)
// use our own assertion to print without memory allocation
void _mi_assert_fail(const char* assertion, const char* fname, unsigned int line, const char* func );
#define mi_assert(expr) ((expr) ? (void)0 : _mi_assert_fail(#expr,__FILE__,__LINE__,__func__))
#else
#define mi_assert(x)
#endif
#if (MI_DEBUG>1)
#define mi_assert_internal mi_assert
#else
#define mi_assert_internal(x)
#endif
#if (MI_DEBUG>2)
#define mi_assert_expensive mi_assert
#else
#define mi_assert_expensive(x)
#endif
// ------------------------------------------------------
// Statistics
// ------------------------------------------------------
#ifndef MI_STAT
#if (MI_DEBUG>0)
#define MI_STAT 2
#else
#define MI_STAT 0
#endif
#endif
typedef struct mi_stat_count_s {
int64_t allocated;
int64_t freed;
int64_t peak;
int64_t current;
} mi_stat_count_t;
typedef struct mi_stat_counter_s {
int64_t total;
int64_t count;
} mi_stat_counter_t;
typedef struct mi_stats_s {
mi_stat_count_t segments;
mi_stat_count_t pages;
mi_stat_count_t reserved;
mi_stat_count_t committed;
mi_stat_count_t reset;
mi_stat_count_t page_committed;
mi_stat_count_t segments_abandoned;
mi_stat_count_t pages_abandoned;
mi_stat_count_t pages_extended;
mi_stat_count_t mmap_calls;
mi_stat_count_t mmap_right_align;
mi_stat_count_t mmap_ensure_aligned;
mi_stat_count_t commit_calls;
mi_stat_count_t threads;
mi_stat_count_t huge;
mi_stat_count_t malloc;
mi_stat_counter_t searches;
#if MI_STAT>1
mi_stat_count_t normal[MI_BIN_HUGE+1];
#endif
} mi_stats_t;
void _mi_stat_increase(mi_stat_count_t* stat, size_t amount);
void _mi_stat_decrease(mi_stat_count_t* stat, size_t amount);
void _mi_stat_counter_increase(mi_stat_counter_t* stat, size_t amount);
#if (MI_STAT)
#define mi_stat_increase(stat,amount) _mi_stat_increase( &(stat), amount)
#define mi_stat_decrease(stat,amount) _mi_stat_decrease( &(stat), amount)
#define mi_stat_counter_increase(stat,amount) _mi_stat_counter_increase( &(stat), amount)
#else
#define mi_stat_increase(stat,amount) (void)0
#define mi_stat_decrease(stat,amount) (void)0
#define mi_stat_counter_increase(stat,amount) (void)0
#endif
#define mi_heap_stat_increase(heap,stat,amount) mi_stat_increase( (heap)->tld->stats.stat, amount)
#define mi_heap_stat_decrease(heap,stat,amount) mi_stat_decrease( (heap)->tld->stats.stat, amount)
// ------------------------------------------------------
// Thread Local data
// ------------------------------------------------------
// Queue of segments
typedef struct mi_segment_queue_s {
mi_segment_t* first;
mi_segment_t* last;
} mi_segment_queue_t;
// Segments thread local data
typedef struct mi_segments_tld_s {
mi_segment_queue_t small_free; // queue of segments with free small pages
size_t current_size; // current size of all segments
size_t peak_size; // peak size of all segments
size_t cache_count; // number of segments in the cache
size_t cache_size; // total size of all segments in the cache
mi_segment_queue_t cache; // (small) cache of segments for small and large pages (to avoid repeated mmap calls)
mi_stats_t* stats; // points to tld stats
} mi_segments_tld_t;
// OS thread local data
typedef struct mi_os_tld_s {
uintptr_t mmap_next_probable; // probable next address start allocated by mmap (to guess which path to take on alignment)
void* mmap_previous; // previous address returned by mmap
uint8_t* pool; // pool of segments to reduce mmap calls on some platforms
size_t pool_available; // bytes available in the pool
mi_stats_t* stats; // points to tld stats
} mi_os_tld_t;
// Thread local data
struct mi_tld_s {
unsigned long long heartbeat; // monotonic heartbeat count
mi_heap_t* heap_backing; // backing heap of this thread (cannot be deleted)
mi_segments_tld_t segments; // segment tld
mi_os_tld_t os; // os tld
mi_stats_t stats; // statistics
};
#endif
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