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/*****************************************************************************/
/* dalist: a zero-dependency book-keeping library */
/* Copyright (C) 2013--2021 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.DALIST. */
/*****************************************************************************/
#include <dalist/dalist.h>
#include "dalist_impl.h"
/* private prototypes */
static void * dalist_alloc(struct dalist_ex * dlist);
static int dalist_memfn_internal(
struct dalist_ex * dlist,
void ** addr,
size_t * alloc_size);
dalist_api
int dalist_get_free_node(
struct dalist_ex * dlist,
void ** fnode)
{
int ret;
struct dalist_node * nfree;
/* in case we fail */
*fnode = (void *)0;
if (dlist->free)
/* allocation is not needed */
nfree = (struct dalist_node *)dlist->free;
else
nfree = (struct dalist_node *)dalist_alloc(dlist);
if (nfree) {
*fnode = nfree;
dlist->free = nfree->next;
if (nfree->next) /* new head of dlist->free */
nfree->next->prev = 0;
/* bookkeeping */
dlist->info.free_nodes--;
/* and for good measure */
nfree->prev = nfree->next = 0;
ret = DALIST_OK;
} else
ret = DALIST_EMEMFN;
return ret;
}
dalist_api
int dalist_deposit_free_node(
struct dalist_ex * dlist,
void * fnode)
{
int ret;
struct dalist_node * nfree;
if (fnode) {
nfree = (struct dalist_node *)fnode;
nfree->next = (struct dalist_node *)dlist->free;
/* fnode is now the head free node */
nfree->prev = 0;
dlist->free = fnode;
/* bookkeeping */
dlist->info.free_nodes++;
ret = DALIST_OK;
} else {
ret = DALIST_ENODE;
}
return ret;
}
dalist_api
int dalist_deposit_memory_block(
struct dalist_ex * dlist,
void * addr,
size_t alloc_size)
{
struct dalist_node * fnode;
struct dalist_node * fnode_next;
char * naddr;
char * naddr_next;
char * naddr_upper;
size_t node_size;
/* node_size: before alignment */
if (dlist->dblock_size == 0)
node_size = sizeof(struct dalist_node);
else
node_size = (size_t)&((struct dalist_node_ex *)0)->dblock
+ dlist->dblock_size;
/* node_size: after alignment */
node_size += sizeof(uintptr_t)-1;
node_size |= sizeof(uintptr_t)-1;
node_size ^= sizeof(uintptr_t)-1;
/* validate block size */
if (alloc_size < node_size)
return DALIST_EMEMBLOCK;
/* marks */
naddr = (char *)addr;
naddr_next = naddr + node_size;
naddr_upper = naddr + alloc_size;
/* chain of free nodes */
while ((naddr_next + node_size) <= naddr_upper) {
fnode = (struct dalist_node *)naddr;
fnode_next = (struct dalist_node *)naddr_next;
fnode->next = fnode_next;
fnode_next->prev = fnode;
naddr += node_size;
naddr_next += node_size;
}
/* free nodes block: head and tail */
fnode = (struct dalist_node *)addr;
fnode_next = (struct dalist_node *)naddr;
if (dlist->free) {
/* link with pre-allocated free nodes */
fnode_next->next = (struct dalist_node *)dlist->free;
((struct dalist_node *)dlist->free)->prev = fnode_next;
} else {
/* no pre-allocated free nodes */
fnode_next->next = 0;
}
/* fnode is now the head free node */
fnode->prev = 0;
dlist->free = fnode;
/* bookkeeping */
dlist->info.free_nodes += (alloc_size / node_size);
return DALIST_OK;
}
static void * __cdecl dalist_alloc(struct dalist_ex * dlist)
{
int ret;
void * addr;
size_t alloc_size;
memfn_custom * pmemfn;
struct dalist_node * fnode;
/* pmemfn */
if (dlist->memfn_method == DALIST_MEMFN_CUSTOM)
pmemfn = (dalist_memfn_custom *)(uintptr_t)dlist->memfn_ptr;
else
pmemfn = dalist_memfn_internal;
/* allocate: try */
addr = 0;
fnode = 0;
ret = pmemfn(dlist,&addr,&alloc_size);
/* allocate: verify */
if (ret == DALIST_OK) {
if (dlist->memfn_method == DALIST_MEMFN_MALLOC)
fnode = (struct dalist_node *)addr;
else if (dalist_deposit_memory_block(
dlist,
addr,
alloc_size) == DALIST_OK)
fnode = (struct dalist_node *)dlist->free;
}
return fnode;
}
static int __cdecl dalist_memfn_internal(
struct dalist_ex * dlist,
void ** address,
size_t * alloc_size)
{
int ret;
void * addr;
size_t size;
memfn_mmap * pfn_mmap;
memfn_malloc * pfn_malloc;
memfn_allocvm * pfn_allocvm;
switch (dlist->memfn_method) {
case DALIST_MEMFN_MALLOC:
if (dlist->dblock_size == 0)
size = sizeof(struct dalist_node);
else
size = (size_t)((struct dalist_node_ex *)0)->dblock
+ dlist->dblock_size;
pfn_malloc = (memfn_malloc *)(uintptr_t)dlist->memfn_ptr;
addr = pfn_malloc(size);
if (addr) {
*address = addr;
*alloc_size = size;
ret = dlist->memfn_status = DALIST_OK;
} else {
ret = DALIST_EMEMFN;
dlist->memfn_status = dalist_errno(ret);
}
break;
case DALIST_MEMFN_MMAP:
pfn_mmap = (memfn_mmap * )(uintptr_t)dlist->memfn_ptr;
addr = pfn_mmap(
(void *)0,
dlist->lblock_size,
PROT_READ | PROT_WRITE,
MAP_ANON | MAP_SHARED,
0,0);
if (addr) {
*address = addr;
*alloc_size = dlist->lblock_size;
ret = dlist->memfn_status = DALIST_OK;
} else {
ret = DALIST_EMEMFN;
dlist->memfn_status = dalist_errno(ret);
}
break;
case DALIST_MEMFN_NT_ALLOCATE_VIRTUAL_MEMORY:
addr = (void *)0;
size = dlist->lblock_size;
pfn_allocvm = (memfn_allocvm *)(uintptr_t)dlist->memfn_ptr;
dlist->memfn_status = pfn_allocvm(
NT_CURRENT_PROCESS_HANDLE,
&addr,
0,
&size,
NT_MEM_COMMIT,
NT_PAGE_READWRITE);
if (dlist->memfn_status == NT_STATUS_SUCCESS) {
*address = addr;
*alloc_size = size;
ret = DALIST_OK;
} else {
ret = DALIST_EMEMFN;
}
break;
default:
ret = DALIST_EINTERNAL;
break;
}
return ret;
}
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