office-gobmx/sal/rtl/alloc_arena.cxx
Gabor Kelemen 2e71c43905 tdf#146619 Remove unused includes from sal/ [cpp files]
Change-Id: I11a54c1ddf73c16ce46a0d1c375bf43157870db7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/155856
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
2023-09-19 08:35:12 +02:00

1115 lines
31 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/config.h>
#include "alloc_arena.hxx"
#include "alloc_impl.hxx"
#include <rtllifecycle.h>
#include <cassert>
#include <string.h>
#include <stdio.h>
#if defined(SAL_UNX)
#include <unistd.h>
#endif /* SAL_UNX */
namespace {
/**
@internal
*/
struct rtl_arena_list_st
{
rtl_memory_lock_type m_lock;
rtl_arena_type m_arena_head;
};
}
static rtl_arena_list_st g_arena_list;
/**
provided for arena_type allocations, and hash_table resizing.
@internal
*/
static rtl_arena_type * gp_arena_arena = nullptr;
/**
Low level virtual memory (pseudo) arena
(platform dependent implementation)
@internal
*/
static rtl_arena_type * gp_machdep_arena = nullptr;
rtl_arena_type * gp_default_arena = nullptr;
namespace
{
void * rtl_machdep_alloc(
rtl_arena_type * pArena,
sal_Size * pSize
);
void rtl_machdep_free(
rtl_arena_type * pArena,
void * pAddr,
sal_Size nSize
);
sal_Size rtl_machdep_pagesize();
void rtl_arena_segment_constructor(void * obj)
{
rtl_arena_segment_type * segment = static_cast<rtl_arena_segment_type*>(obj);
QUEUE_START_NAMED(segment, s);
QUEUE_START_NAMED(segment, f);
}
void rtl_arena_segment_destructor(void * obj)
{
rtl_arena_segment_type * segment = static_cast< rtl_arena_segment_type * >(
obj);
assert(QUEUE_STARTED_NAMED(segment, s));
assert(QUEUE_STARTED_NAMED(segment, f));
(void) segment; // avoid warnings
}
/**
@precond arena->m_lock acquired.
*/
bool rtl_arena_segment_populate(rtl_arena_type * arena)
{
rtl_arena_segment_type *span;
sal_Size size = rtl_machdep_pagesize();
span = static_cast< rtl_arena_segment_type * >(
rtl_machdep_alloc(gp_machdep_arena, &size));
if (span)
{
rtl_arena_segment_type *first, *last, *head;
sal_Size count = size / sizeof(rtl_arena_segment_type);
/* insert onto reserve span list */
QUEUE_INSERT_TAIL_NAMED(&(arena->m_segment_reserve_span_head), span, s);
QUEUE_START_NAMED(span, f);
span->m_addr = reinterpret_cast<sal_uIntPtr>(span);
span->m_size = size;
span->m_type = RTL_ARENA_SEGMENT_TYPE_SPAN;
/* insert onto reserve list */
head = &(arena->m_segment_reserve_head);
for (first = span + 1, last = span + count; first < last; ++first)
{
QUEUE_INSERT_TAIL_NAMED(head, first, s);
QUEUE_START_NAMED(first, f);
first->m_addr = 0;
first->m_size = 0;
first->m_type = 0;
}
}
return (span != nullptr);
}
/**
@precond arena->m_lock acquired.
@precond (*ppSegment == 0)
*/
void rtl_arena_segment_get(
rtl_arena_type * arena,
rtl_arena_segment_type ** ppSegment
)
{
rtl_arena_segment_type * head;
assert(!*ppSegment);
head = &(arena->m_segment_reserve_head);
if (head->m_snext != head || rtl_arena_segment_populate (arena))
{
(*ppSegment) = head->m_snext;
QUEUE_REMOVE_NAMED(*ppSegment, s);
}
}
/**
@precond arena->m_lock acquired.
@postcond (*ppSegment == 0)
*/
void rtl_arena_segment_put(
rtl_arena_type * arena,
rtl_arena_segment_type ** ppSegment
)
{
rtl_arena_segment_type * head;
assert(QUEUE_STARTED_NAMED(*ppSegment, s));
assert(QUEUE_STARTED_NAMED(*ppSegment, f));
(*ppSegment)->m_addr = 0;
(*ppSegment)->m_size = 0;
assert((*ppSegment)->m_type != RTL_ARENA_SEGMENT_TYPE_HEAD);
(*ppSegment)->m_type = 0;
/* keep as reserve */
head = &(arena->m_segment_reserve_head);
QUEUE_INSERT_HEAD_NAMED(head, (*ppSegment), s);
/* clear */
(*ppSegment) = nullptr;
}
/**
@precond arena->m_lock acquired.
*/
void rtl_arena_freelist_insert (
rtl_arena_type * arena,
rtl_arena_segment_type * segment
)
{
rtl_arena_segment_type * head;
const auto bit = highbit(segment->m_size);
assert(bit > 0);
head = &(arena->m_freelist_head[bit - 1]);
QUEUE_INSERT_TAIL_NAMED(head, segment, f);
arena->m_freelist_bitmap |= head->m_size;
}
/**
@precond arena->m_lock acquired.
*/
void rtl_arena_freelist_remove(
rtl_arena_type * arena,
rtl_arena_segment_type * segment
)
{
if (segment->m_fnext->m_type == RTL_ARENA_SEGMENT_TYPE_HEAD &&
segment->m_fprev->m_type == RTL_ARENA_SEGMENT_TYPE_HEAD)
{
rtl_arena_segment_type * head;
head = segment->m_fprev;
assert(arena->m_freelist_bitmap & head->m_size);
arena->m_freelist_bitmap ^= head->m_size;
}
QUEUE_REMOVE_NAMED(segment, f);
}
#define RTL_ARENA_HASH_INDEX_IMPL(a, s, q, m) \
((((a) + ((a) >> (s)) + ((a) >> ((s) << 1))) >> (q)) & (m))
#define RTL_ARENA_HASH_INDEX(arena, addr) \
RTL_ARENA_HASH_INDEX_IMPL((addr), (arena)->m_hash_shift, (arena)->m_quantum_shift, ((arena)->m_hash_size - 1))
/**
@precond arena->m_lock released.
*/
void rtl_arena_hash_rescale(
rtl_arena_type * arena,
sal_Size new_size
)
{
assert(new_size != 0);
rtl_arena_segment_type ** new_table;
sal_Size new_bytes;
new_bytes = new_size * sizeof(rtl_arena_segment_type*);
new_table = static_cast<rtl_arena_segment_type **>(rtl_arena_alloc (gp_arena_arena, &new_bytes));
if (new_table)
{
rtl_arena_segment_type ** old_table;
sal_Size old_size, i;
memset (new_table, 0, new_bytes);
RTL_MEMORY_LOCK_ACQUIRE(&(arena->m_lock));
old_table = arena->m_hash_table;
old_size = arena->m_hash_size;
arena->m_hash_table = new_table;
arena->m_hash_size = new_size;
arena->m_hash_shift = highbit(arena->m_hash_size) - 1;
for (i = 0; i < old_size; i++)
{
rtl_arena_segment_type * curr = old_table[i];
while (curr)
{
rtl_arena_segment_type * next = curr->m_fnext;
rtl_arena_segment_type ** head;
// coverity[negative_shift] - bogus
head = &(arena->m_hash_table[RTL_ARENA_HASH_INDEX(arena, curr->m_addr)]);
curr->m_fnext = (*head);
(*head) = curr;
curr = next;
}
old_table[i] = nullptr;
}
RTL_MEMORY_LOCK_RELEASE(&(arena->m_lock));
if (old_table != arena->m_hash_table_0)
{
sal_Size old_bytes = old_size * sizeof(rtl_arena_segment_type*);
rtl_arena_free (gp_arena_arena, old_table, old_bytes);
}
}
}
/**
Insert arena hash, and update stats.
*/
void rtl_arena_hash_insert(
rtl_arena_type * arena,
rtl_arena_segment_type * segment
)
{
rtl_arena_segment_type ** ppSegment;
ppSegment = &(arena->m_hash_table[RTL_ARENA_HASH_INDEX(arena, segment->m_addr)]);
segment->m_fnext = (*ppSegment);
(*ppSegment) = segment;
arena->m_stats.m_alloc += 1;
arena->m_stats.m_mem_alloc += segment->m_size;
}
/**
Remove arena hash, and update stats.
*/
rtl_arena_segment_type * rtl_arena_hash_remove(
rtl_arena_type * arena,
sal_uIntPtr addr,
sal_Size size
)
{
rtl_arena_segment_type *segment, **segpp;
sal_Size lookups = 0;
segpp = &(arena->m_hash_table[RTL_ARENA_HASH_INDEX(arena, addr)]);
while ((segment = *segpp))
{
if (segment->m_addr == addr)
{
*segpp = segment->m_fnext;
segment->m_fnext = segment->m_fprev = segment;
break;
}
/* update lookup miss stats */
lookups += 1;
segpp = &(segment->m_fnext);
}
assert(segment); // bad free
if (segment)
{
assert(segment->m_size == size);
(void) size; // avoid warnings
arena->m_stats.m_free += 1;
arena->m_stats.m_mem_alloc -= segment->m_size;
if (lookups > 1)
{
sal_Size nseg = static_cast<sal_Size>(arena->m_stats.m_alloc - arena->m_stats.m_free);
if (nseg > 4 * arena->m_hash_size)
{
if (!(arena->m_flags & RTL_ARENA_FLAG_RESCALE))
{
sal_Size ave = nseg >> arena->m_hash_shift;
assert(ave != 0);
sal_Size new_size = arena->m_hash_size << (highbit(ave) - 1);
arena->m_flags |= RTL_ARENA_FLAG_RESCALE;
RTL_MEMORY_LOCK_RELEASE(&(arena->m_lock));
rtl_arena_hash_rescale (arena, new_size);
RTL_MEMORY_LOCK_ACQUIRE(&(arena->m_lock));
arena->m_flags &= ~RTL_ARENA_FLAG_RESCALE;
}
}
}
}
return segment;
}
/**
allocate (and remove) segment from freelist
@precond arena->m_lock acquired
@precond (*ppSegment == 0)
*/
bool rtl_arena_segment_alloc(
rtl_arena_type * arena,
sal_Size size,
rtl_arena_segment_type ** ppSegment
)
{
int index = 0;
assert(!*ppSegment);
if (!RTL_MEMORY_ISP2(size))
{
unsigned int msb = highbit(size);
if (RTL_ARENA_FREELIST_SIZE == msb)
{
/* highest possible freelist: fall back to first fit */
rtl_arena_segment_type *head, *segment;
head = &(arena->m_freelist_head[msb - 1]);
for (segment = head->m_fnext; segment != head; segment = segment->m_fnext)
{
if (segment->m_size >= size)
{
/* allocate first fit segment */
(*ppSegment) = segment;
break;
}
}
goto dequeue_and_leave;
}
/* roundup to next power of 2 */
size = ((sal_Size(1)) << msb);
}
index = lowbit(RTL_MEMORY_P2ALIGN(arena->m_freelist_bitmap, size));
if (index > 0)
{
/* instant fit: allocate first free segment */
rtl_arena_segment_type *head;
head = &(arena->m_freelist_head[index - 1]);
(*ppSegment) = head->m_fnext;
assert((*ppSegment) != head);
}
dequeue_and_leave:
if (*ppSegment)
{
/* remove from freelist */
rtl_arena_freelist_remove (arena, (*ppSegment));
}
return (*ppSegment != nullptr);
}
/**
import new (span) segment from source arena
@precond arena->m_lock acquired
@precond (*ppSegment == 0)
*/
bool rtl_arena_segment_create(
rtl_arena_type * arena,
sal_Size size,
rtl_arena_segment_type ** ppSegment
)
{
assert(!*ppSegment);
if (arena->m_source_alloc)
{
rtl_arena_segment_get (arena, ppSegment);
if (*ppSegment)
{
rtl_arena_segment_type * span = nullptr;
rtl_arena_segment_get (arena, &span);
if (span)
{
/* import new span from source arena */
RTL_MEMORY_LOCK_RELEASE(&(arena->m_lock));
span->m_size = size;
span->m_addr = reinterpret_cast<sal_uIntPtr>(
(arena->m_source_alloc)(
arena->m_source_arena, &(span->m_size)));
RTL_MEMORY_LOCK_ACQUIRE(&(arena->m_lock));
if (span->m_addr != 0)
{
/* insert onto segment list, update stats */
span->m_type = RTL_ARENA_SEGMENT_TYPE_SPAN;
QUEUE_INSERT_HEAD_NAMED(&(arena->m_segment_head), span, s);
arena->m_stats.m_mem_total += span->m_size;
(*ppSegment)->m_addr = span->m_addr;
(*ppSegment)->m_size = span->m_size;
(*ppSegment)->m_type = RTL_ARENA_SEGMENT_TYPE_FREE;
QUEUE_INSERT_HEAD_NAMED(span, (*ppSegment), s);
/* report success */
return true;
}
rtl_arena_segment_put (arena, &span);
}
rtl_arena_segment_put (arena, ppSegment);
}
}
return false; // failure
}
/**
mark as free and join with adjacent free segment(s)
@precond arena->m_lock acquired
@precond segment marked 'used'
*/
void rtl_arena_segment_coalesce(
rtl_arena_type * arena,
rtl_arena_segment_type * segment
)
{
rtl_arena_segment_type *next, *prev;
/* mark segment free */
assert(segment->m_type == RTL_ARENA_SEGMENT_TYPE_USED);
segment->m_type = RTL_ARENA_SEGMENT_TYPE_FREE;
/* try to merge w/ next segment */
next = segment->m_snext;
if (next->m_type == RTL_ARENA_SEGMENT_TYPE_FREE)
{
assert(segment->m_addr + segment->m_size == next->m_addr);
segment->m_size += next->m_size;
/* remove from freelist */
rtl_arena_freelist_remove (arena, next);
/* remove from segment list */
QUEUE_REMOVE_NAMED(next, s);
/* release segment descriptor */
rtl_arena_segment_put (arena, &next);
}
/* try to merge w/ prev segment */
prev = segment->m_sprev;
if (prev->m_type == RTL_ARENA_SEGMENT_TYPE_FREE)
{
assert(prev->m_addr + prev->m_size == segment->m_addr);
segment->m_addr = prev->m_addr;
segment->m_size += prev->m_size;
/* remove from freelist */
rtl_arena_freelist_remove (arena, prev);
/* remove from segment list */
QUEUE_REMOVE_NAMED(prev, s);
/* release segment descriptor */
rtl_arena_segment_put (arena, &prev);
}
}
void rtl_arena_constructor(void * obj)
{
rtl_arena_type * arena = static_cast<rtl_arena_type*>(obj);
rtl_arena_segment_type * head;
size_t i;
memset (arena, 0, sizeof(rtl_arena_type));
QUEUE_START_NAMED(arena, arena_);
RTL_MEMORY_LOCK_INIT(&(arena->m_lock));
head = &(arena->m_segment_reserve_span_head);
rtl_arena_segment_constructor (head);
head->m_type = RTL_ARENA_SEGMENT_TYPE_HEAD;
head = &(arena->m_segment_reserve_head);
rtl_arena_segment_constructor (head);
head->m_type = RTL_ARENA_SEGMENT_TYPE_HEAD;
head = &(arena->m_segment_head);
rtl_arena_segment_constructor (head);
head->m_type = RTL_ARENA_SEGMENT_TYPE_HEAD;
for (i = 0; i < RTL_ARENA_FREELIST_SIZE; i++)
{
head = &(arena->m_freelist_head[i]);
rtl_arena_segment_constructor (head);
head->m_size = ((sal_Size(1)) << i);
head->m_type = RTL_ARENA_SEGMENT_TYPE_HEAD;
}
arena->m_hash_table = arena->m_hash_table_0;
arena->m_hash_size = RTL_ARENA_HASH_SIZE;
arena->m_hash_shift = highbit(arena->m_hash_size) - 1;
}
void rtl_arena_destructor(void * obj)
{
rtl_arena_type * arena = static_cast<rtl_arena_type*>(obj);
rtl_arena_segment_type * head;
size_t i;
assert(QUEUE_STARTED_NAMED(arena, arena_));
RTL_MEMORY_LOCK_DESTROY(&(arena->m_lock));
head = &(arena->m_segment_reserve_span_head);
assert(head->m_type == RTL_ARENA_SEGMENT_TYPE_HEAD);
rtl_arena_segment_destructor (head);
head = &(arena->m_segment_reserve_head);
assert(head->m_type == RTL_ARENA_SEGMENT_TYPE_HEAD);
rtl_arena_segment_destructor (head);
head = &(arena->m_segment_head);
assert(head->m_type == RTL_ARENA_SEGMENT_TYPE_HEAD);
rtl_arena_segment_destructor (head);
for (i = 0; i < RTL_ARENA_FREELIST_SIZE; i++)
{
head = &(arena->m_freelist_head[i]);
assert(head->m_size == ((sal_Size(1)) << i));
assert(head->m_type == RTL_ARENA_SEGMENT_TYPE_HEAD);
rtl_arena_segment_destructor (head);
}
assert(arena->m_hash_table == arena->m_hash_table_0);
assert(arena->m_hash_size == RTL_ARENA_HASH_SIZE);
assert(arena->m_hash_shift == highbit(arena->m_hash_size) - 1);
}
rtl_arena_type * rtl_arena_activate(
rtl_arena_type * arena,
const char * name,
sal_Size quantum,
rtl_arena_type * source_arena,
void * (SAL_CALL * source_alloc)(rtl_arena_type *, sal_Size *),
void (SAL_CALL * source_free) (rtl_arena_type *, void *, sal_Size)
)
{
assert(arena);
if (arena)
{
(void) snprintf (arena->m_name, sizeof(arena->m_name), "%s", name);
if (!RTL_MEMORY_ISP2(quantum))
{
/* roundup to next power of 2 */
quantum = ((sal_Size(1)) << highbit(quantum));
}
arena->m_quantum = quantum;
arena->m_quantum_shift = highbit(arena->m_quantum) - 1;
arena->m_source_arena = source_arena;
arena->m_source_alloc = source_alloc;
arena->m_source_free = source_free;
/* insert into arena list */
RTL_MEMORY_LOCK_ACQUIRE(&(g_arena_list.m_lock));
QUEUE_INSERT_TAIL_NAMED(&(g_arena_list.m_arena_head), arena, arena_);
RTL_MEMORY_LOCK_RELEASE(&(g_arena_list.m_lock));
}
return arena;
}
void rtl_arena_deactivate(rtl_arena_type * arena)
{
rtl_arena_segment_type * head, * segment;
/* remove from arena list */
RTL_MEMORY_LOCK_ACQUIRE(&(g_arena_list.m_lock));
QUEUE_REMOVE_NAMED(arena, arena_);
RTL_MEMORY_LOCK_RELEASE(&(g_arena_list.m_lock));
/* check for leaked segments */
if (arena->m_stats.m_alloc > arena->m_stats.m_free)
{
sal_Size i, n;
/* cleanup still used segment(s) */
for (i = 0, n = arena->m_hash_size; i < n; i++)
{
while ((segment = arena->m_hash_table[i]))
{
/* pop from hash table */
arena->m_hash_table[i] = segment->m_fnext;
segment->m_fnext = segment->m_fprev = segment;
/* coalesce w/ adjacent free segment(s) */
rtl_arena_segment_coalesce (arena, segment);
/* insert onto freelist */
rtl_arena_freelist_insert (arena, segment);
}
}
}
/* cleanup hash table */
if (arena->m_hash_table != arena->m_hash_table_0)
{
rtl_arena_free(
gp_arena_arena,
arena->m_hash_table,
arena->m_hash_size * sizeof(rtl_arena_segment_type*));
arena->m_hash_table = arena->m_hash_table_0;
arena->m_hash_size = RTL_ARENA_HASH_SIZE;
arena->m_hash_shift = highbit(arena->m_hash_size) - 1;
}
/* cleanup segment list */
head = &(arena->m_segment_head);
for (segment = head->m_snext; segment != head; segment = head->m_snext)
{
if (segment->m_type == RTL_ARENA_SEGMENT_TYPE_FREE)
{
/* remove from freelist */
rtl_arena_freelist_remove (arena, segment);
}
else
{
/* can have only free and span segments here */
assert(segment->m_type == RTL_ARENA_SEGMENT_TYPE_SPAN);
}
/* remove from segment list */
QUEUE_REMOVE_NAMED(segment, s);
/* release segment descriptor */
rtl_arena_segment_put (arena, &segment);
}
/* cleanup segment reserve list */
head = &(arena->m_segment_reserve_head);
for (segment = head->m_snext; segment != head; segment = head->m_snext)
{
/* remove from segment list */
QUEUE_REMOVE_NAMED(segment, s);
}
/* cleanup segment reserve span(s) */
head = &(arena->m_segment_reserve_span_head);
for (segment = head->m_snext; segment != head; segment = head->m_snext)
{
/* can have only span segments here */
assert(segment->m_type == RTL_ARENA_SEGMENT_TYPE_SPAN);
/* remove from segment list */
QUEUE_REMOVE_NAMED(segment, s);
/* return span to g_machdep_arena */
rtl_machdep_free (gp_machdep_arena, reinterpret_cast<void*>(segment->m_addr), segment->m_size);
}
}
} // namespace
rtl_arena_type * SAL_CALL rtl_arena_create(
const char * name,
sal_Size quantum,
sal_Size,
rtl_arena_type * source_arena,
void * (SAL_CALL * source_alloc)(rtl_arena_type *, sal_Size *),
void (SAL_CALL * source_free) (rtl_arena_type *, void *, sal_Size),
SAL_UNUSED_PARAMETER int
) SAL_THROW_EXTERN_C()
{
rtl_arena_type * result = nullptr;
sal_Size size = sizeof(rtl_arena_type);
try_alloc:
result = static_cast<rtl_arena_type*>(rtl_arena_alloc (gp_arena_arena, &size));
if (result)
{
rtl_arena_type * arena = result;
rtl_arena_constructor (arena);
if (!source_arena)
{
assert(gp_default_arena);
source_arena = gp_default_arena;
}
result = rtl_arena_activate (
arena,
name,
quantum,
source_arena,
source_alloc,
source_free
);
if (!result)
{
rtl_arena_deactivate (arena);
rtl_arena_destructor (arena);
rtl_arena_free (gp_arena_arena, arena, size);
}
}
else if (!gp_arena_arena)
{
ensureArenaSingleton();
if (gp_arena_arena)
{
/* try again */
goto try_alloc;
}
}
return result;
}
void SAL_CALL rtl_arena_destroy(rtl_arena_type * arena) SAL_THROW_EXTERN_C()
{
if (arena)
{
rtl_arena_deactivate (arena);
rtl_arena_destructor (arena);
rtl_arena_free (gp_arena_arena, arena, sizeof(rtl_arena_type));
}
}
void * SAL_CALL rtl_arena_alloc(
rtl_arena_type * arena,
sal_Size * pSize
) SAL_THROW_EXTERN_C()
{
void * addr = nullptr;
if (arena && pSize)
{
sal_Size size;
size = RTL_MEMORY_ALIGN(*pSize, arena->m_quantum);
if (size > 0)
{
/* allocate from segment list */
rtl_arena_segment_type *segment = nullptr;
RTL_MEMORY_LOCK_ACQUIRE(&(arena->m_lock));
if (rtl_arena_segment_alloc (arena, size, &segment) ||
rtl_arena_segment_create(arena, size, &segment) )
{
/* shrink to fit */
sal_Size oversize;
/* mark segment used */
assert(segment->m_type == RTL_ARENA_SEGMENT_TYPE_FREE);
segment->m_type = RTL_ARENA_SEGMENT_TYPE_USED;
/* resize */
assert(segment->m_size >= size);
oversize = segment->m_size - size;
if (oversize >= arena->m_quantum)
{
rtl_arena_segment_type * remainder = nullptr;
rtl_arena_segment_get (arena, &remainder);
if (remainder)
{
segment->m_size = size;
remainder->m_addr = segment->m_addr + segment->m_size;
remainder->m_size = oversize;
remainder->m_type = RTL_ARENA_SEGMENT_TYPE_FREE;
QUEUE_INSERT_HEAD_NAMED(segment, remainder, s);
rtl_arena_freelist_insert (arena, remainder);
}
}
rtl_arena_hash_insert (arena, segment);
(*pSize) = segment->m_size;
addr = reinterpret_cast<void*>(segment->m_addr);
}
RTL_MEMORY_LOCK_RELEASE(&(arena->m_lock));
}
}
return addr;
}
void SAL_CALL rtl_arena_free (
rtl_arena_type * arena,
void * addr,
sal_Size size
) SAL_THROW_EXTERN_C()
{
if (arena)
{
size = RTL_MEMORY_ALIGN(size, arena->m_quantum);
if (size > 0)
{
/* free to segment list */
rtl_arena_segment_type * segment;
RTL_MEMORY_LOCK_ACQUIRE(&(arena->m_lock));
segment = rtl_arena_hash_remove (arena, reinterpret_cast<sal_uIntPtr>(addr), size);
if (segment)
{
rtl_arena_segment_type *next, *prev;
/* coalesce w/ adjacent free segment(s) */
rtl_arena_segment_coalesce (arena, segment);
/* determine (new) next and prev segment */
next = segment->m_snext;
prev = segment->m_sprev;
/* entire span free when prev is a span, and next is either a span or a list head */
if (prev->m_type == RTL_ARENA_SEGMENT_TYPE_SPAN &&
((next->m_type == RTL_ARENA_SEGMENT_TYPE_SPAN) ||
(next->m_type == RTL_ARENA_SEGMENT_TYPE_HEAD)))
{
assert(
prev->m_addr == segment->m_addr
&& prev->m_size == segment->m_size);
if (arena->m_source_free)
{
addr = reinterpret_cast<void*>(prev->m_addr);
size = prev->m_size;
/* remove from segment list */
QUEUE_REMOVE_NAMED(segment, s);
/* release segment descriptor */
rtl_arena_segment_put (arena, &segment);
/* remove from segment list */
QUEUE_REMOVE_NAMED(prev, s);
/* release (span) segment descriptor */
rtl_arena_segment_put (arena, &prev);
/* update stats, return span to source arena */
arena->m_stats.m_mem_total -= size;
RTL_MEMORY_LOCK_RELEASE(&(arena->m_lock));
(arena->m_source_free)(arena->m_source_arena, addr, size);
return;
}
}
/* insert onto freelist */
rtl_arena_freelist_insert (arena, segment);
}
RTL_MEMORY_LOCK_RELEASE(&(arena->m_lock));
}
}
}
void rtl_arena_foreach (rtl_arena_type *arena, ArenaForeachFn foreachFn)
{
/* used segments */
for (int i = 0, n = arena->m_hash_size; i < n; i++)
{
for (rtl_arena_segment_type *segment = arena->m_hash_table[i];
segment != nullptr; segment = segment->m_fnext)
{
foreachFn(reinterpret_cast<void *>(segment->m_addr),
segment->m_size);
}
}
}
#if defined(SAL_UNX)
#include <sys/mman.h>
#elif defined(_WIN32)
#define MAP_FAILED nullptr
#endif /* SAL_UNX || _WIN32 */
namespace
{
void * rtl_machdep_alloc(
rtl_arena_type * pArena,
sal_Size * pSize
)
{
void * addr;
sal_Size size = *pSize;
assert(pArena == gp_machdep_arena);
#if defined(__sun) && defined(SPARC)
/* see @ mmap(2) man pages */
size += (pArena->m_quantum + pArena->m_quantum); /* "red-zone" pages */
if (size > (4 << 20))
size = RTL_MEMORY_P2ROUNDUP(size, (4 << 20));
else if (size > (512 << 10))
size = RTL_MEMORY_P2ROUNDUP(size, (512 << 10));
else
size = RTL_MEMORY_P2ROUNDUP(size, (64 << 10));
size -= (pArena->m_quantum + pArena->m_quantum); /* "red-zone" pages */
#else
/* default allocation granularity */
if (pArena->m_quantum < (64 << 10))
{
size = RTL_MEMORY_P2ROUNDUP(size, (64 << 10));
}
else
{
size = RTL_MEMORY_P2ROUNDUP(size, pArena->m_quantum);
}
#endif
#if defined(SAL_UNX)
addr = mmap (nullptr, static_cast<size_t>(size), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
#elif defined(_WIN32)
addr = VirtualAlloc (nullptr, static_cast<SIZE_T>(size), MEM_COMMIT, PAGE_READWRITE);
#endif /* (SAL_UNX || _WIN32) */
if (addr != MAP_FAILED)
{
pArena->m_stats.m_alloc += 1;
pArena->m_stats.m_mem_total += size;
pArena->m_stats.m_mem_alloc += size;
(*pSize) = size;
return addr;
}
return nullptr;
}
void rtl_machdep_free(
rtl_arena_type * pArena,
void * pAddr,
sal_Size nSize
)
{
assert(pArena == gp_machdep_arena);
pArena->m_stats.m_free += 1;
pArena->m_stats.m_mem_total -= nSize;
pArena->m_stats.m_mem_alloc -= nSize;
#if defined(SAL_UNX)
(void) munmap(pAddr, nSize);
#elif defined(_WIN32)
(void) VirtualFree (pAddr, SIZE_T(0), MEM_RELEASE);
#endif /* (SAL_UNX || _WIN32) */
}
sal_Size rtl_machdep_pagesize()
{
#if defined(SAL_UNX)
#if defined(FREEBSD) || defined(NETBSD) || defined(DRAGONFLY)
return (sal_Size)getpagesize();
#else /* POSIX */
return static_cast<sal_Size>(sysconf(_SC_PAGESIZE));
#endif /* xBSD || POSIX */
#elif defined(_WIN32)
SYSTEM_INFO info;
GetSystemInfo (&info);
return static_cast<sal_Size>(info.dwPageSize);
#endif /* (SAL_UNX || _WIN32) */
}
} //namespace
void rtl_arena_init()
{
{
/* list of arenas */
RTL_MEMORY_LOCK_INIT(&(g_arena_list.m_lock));
rtl_arena_constructor (&(g_arena_list.m_arena_head));
}
{
/* machdep (pseudo) arena */
static rtl_arena_type g_machdep_arena;
assert(!gp_machdep_arena);
rtl_arena_constructor (&g_machdep_arena);
gp_machdep_arena = rtl_arena_activate (
&g_machdep_arena,
"rtl_machdep_arena",
rtl_machdep_pagesize(),
nullptr, nullptr, nullptr /* no source */
);
assert(gp_machdep_arena);
}
{
/* default arena */
static rtl_arena_type g_default_arena;
assert(!gp_default_arena);
rtl_arena_constructor (&g_default_arena);
gp_default_arena = rtl_arena_activate (
&g_default_arena,
"rtl_default_arena",
rtl_machdep_pagesize(),
gp_machdep_arena, /* source */
rtl_machdep_alloc,
rtl_machdep_free
);
assert(gp_default_arena);
}
{
/* arena internal arena */
static rtl_arena_type g_arena_arena;
assert(!gp_arena_arena);
rtl_arena_constructor (&g_arena_arena);
gp_arena_arena = rtl_arena_activate(
&g_arena_arena,
"rtl_arena_internal_arena",
64, /* quantum */
gp_default_arena, /* source */
rtl_arena_alloc,
rtl_arena_free
);
assert(gp_arena_arena);
}
}
void rtl_arena_fini()
{
if (gp_arena_arena)
{
rtl_arena_type * arena, * head;
RTL_MEMORY_LOCK_ACQUIRE(&(g_arena_list.m_lock));
head = &(g_arena_list.m_arena_head);
for (arena = head->m_arena_next; arena != head; arena = arena->m_arena_next)
{
// noop
}
RTL_MEMORY_LOCK_RELEASE(&(g_arena_list.m_lock));
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */