universe@571: /*
universe@571:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
universe@571:  *
universe@571:  * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
universe@571:  *
universe@571:  * Redistribution and use in source and binary forms, with or without
universe@571:  * modification, are permitted provided that the following conditions are met:
universe@571:  *
universe@571:  *   1. Redistributions of source code must retain the above copyright
universe@571:  *      notice, this list of conditions and the following disclaimer.
universe@571:  *
universe@571:  *   2. Redistributions in binary form must reproduce the above copyright
universe@571:  *      notice, this list of conditions and the following disclaimer in the
universe@571:  *      documentation and/or other materials provided with the distribution.
universe@571:  *
universe@571:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@571:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@571:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@571:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@571:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@571:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@571:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@571:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@571:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@571:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@571:  * POSSIBILITY OF SUCH DAMAGE.
universe@571:  */
universe@571: 
universe@727: #include "cx/mempool.h"
universe@571: #include "cx/utils.h"
universe@571: #include <string.h>
universe@571: 
universe@727: struct cx_mempool_memory_s {
universe@571:     /** The destructor. */
universe@571:     cx_destructor_func destructor;
universe@727:     /** The actual memory. */
universe@727:     char c[];
universe@727: };
universe@571: 
universe@727: static void *cx_mempool_malloc(
universe@727:         void *p,
universe@727:         size_t n
universe@571: ) {
universe@727:     struct cx_mempool_s *pool = p;
universe@727: 
universe@727:     if (pool->size >= pool->capacity) {
universe@727:         size_t newcap = pool->capacity - (pool->capacity % 16) + 16;
universe@727:         struct cx_mempool_memory_s **newdata = realloc(pool->data, newcap*sizeof(struct cx_mempool_memory_s*));
universe@727:         if (newdata == NULL) {
universe@727:             return NULL;
universe@727:         }
universe@727:         pool->data = newdata;
universe@727:         pool->capacity = newcap;
universe@571:     }
universe@571: 
universe@727:     struct cx_mempool_memory_s *mem = malloc(sizeof(cx_destructor_func) + n);
universe@571:     if (mem == NULL) {
universe@571:         return NULL;
universe@571:     }
universe@571: 
universe@727:     mem->destructor = pool->auto_destr;
universe@727:     pool->data[pool->size] = mem;
universe@727:     pool->size++;
universe@571: 
universe@727:     return mem->c;
universe@571: }
universe@571: 
universe@727: static void *cx_mempool_calloc(
universe@727:         void *p,
universe@571:         size_t nelem,
universe@571:         size_t elsize
universe@571: ) {
universe@571:     size_t msz;
universe@571:     if (cx_szmul(nelem, elsize, &msz)) {
universe@571:         return NULL;
universe@571:     }
universe@727:     void *ptr = cx_mempool_malloc(p, msz);
universe@571:     if (ptr == NULL) {
universe@571:         return NULL;
universe@571:     }
universe@571:     memset(ptr, 0, nelem * elsize);
universe@571:     return ptr;
universe@571: }
universe@571: 
universe@727: static void *cx_mempool_realloc(
universe@727:         void *p,
universe@571:         void *ptr,
universe@571:         size_t n
universe@571: ) {
universe@727:     struct cx_mempool_s *pool = p;
universe@571: 
universe@727:     struct cx_mempool_memory_s *mem, *newm;
universe@727:     mem = (struct cx_mempool_memory_s*)(((char *) ptr) - sizeof(cx_destructor_func));
universe@727:     newm = realloc(mem, n + sizeof(cx_destructor_func));
universe@727: 
universe@571:     if (newm == NULL) {
universe@571:         return NULL;
universe@571:     }
universe@571:     if (mem != newm) {
universe@727:         cx_for_n(i, pool->size) {
universe@571:             if (pool->data[i] == mem) {
universe@571:                 pool->data[i] = newm;
universe@727:                 return ((char*)newm) + sizeof(cx_destructor_func);
universe@571:             }
universe@571:         }
universe@571:         abort();
universe@571:     } else {
universe@727:         return ptr;
universe@571:     }
universe@571: }
universe@571: 
universe@727: static void cx_mempool_free(
universe@727:         void *p,
universe@571:         void *ptr
universe@571: ) {
universe@727:     struct cx_mempool_s *pool = p;
universe@571: 
universe@727:     struct cx_mempool_memory_s *mem = (struct cx_mempool_memory_s *)
universe@571:             ((char *) ptr - sizeof(cx_destructor_func));
universe@727: 
universe@727:     cx_for_n(i, pool->size) {
universe@571:         if (mem == pool->data[i]) {
universe@727:             if (mem->destructor) {
universe@727:                 mem->destructor(mem->c);
universe@571:             }
universe@572:             free(mem);
universe@727:             size_t last_index = pool->size - 1;
universe@571:             if (i != last_index) {
universe@571:                 pool->data[i] = pool->data[last_index];
universe@571:                 pool->data[last_index] = NULL;
universe@571:             }
universe@727:             pool->size--;
universe@571:             return;
universe@571:         }
universe@571:     }
universe@571:     abort();
universe@571: }
universe@571: 
universe@727: void cxMempoolDestroy(CxMempool *pool) {
universe@727:     struct cx_mempool_memory_s *mem;
universe@727:     cx_for_n(i, pool->size) {
universe@727:         mem = pool->data[i];
universe@727:         if (mem->destructor) {
universe@727:             mem->destructor(mem->c);
universe@571:         }
universe@727:         free(mem);
universe@571:     }
universe@571:     free(pool->data);
universe@727:     free((void*) pool->allocator);
universe@571:     free(pool);
universe@571: }
universe@571: 
universe@727: void cxMempoolSetDestructor(
universe@571:         void *ptr,
universe@571:         cx_destructor_func func
universe@571: ) {
universe@571:     *(cx_destructor_func *) ((char *) ptr - sizeof(cx_destructor_func)) = func;
universe@571: }
universe@571: 
universe@727: struct cx_mempool_foreign_mem_s {
universe@727:     cx_destructor_func destr;
universe@727:     void* mem;
universe@571: };
universe@571: 
universe@727: static void cx_mempool_destr_foreign_mem(void* ptr) {
universe@727:     struct cx_mempool_foreign_mem_s *fm = ptr;
universe@727:     fm->destr(fm->mem);
universe@727: }
universe@727: 
universe@727: int cxMempoolRegister(
universe@727:         CxMempool *pool,
universe@727:         void *memory,
universe@727:         cx_destructor_func destr
universe@727: ) {
universe@727:     struct cx_mempool_foreign_mem_s *fm = cx_mempool_malloc(
universe@727:             pool,
universe@727:             sizeof(struct cx_mempool_foreign_mem_s)
universe@727:     );
universe@727:     if (fm == NULL) return 1;
universe@727: 
universe@727:     fm->mem = memory;
universe@727:     fm->destr = destr;
universe@727:     *(cx_destructor_func *) ((char *) fm - sizeof(cx_destructor_func)) = cx_mempool_destr_foreign_mem;
universe@727: 
universe@727:     return 0;
universe@727: }
universe@727: 
universe@727: static cx_allocator_class cx_mempool_allocator_class = {
universe@727:         cx_mempool_malloc,
universe@727:         cx_mempool_realloc,
universe@727:         cx_mempool_calloc,
universe@727:         cx_mempool_free
universe@571: };
universe@571: 
universe@727: CxMempool *cxMempoolCreate(
universe@727:         size_t capacity,
universe@727:         cx_destructor_func destr
universe@727: ) {
universe@571:     size_t poolsize;
universe@727:     if (cx_szmul(capacity, sizeof(struct cx_mempool_memory_s*), &poolsize)) {
universe@571:         return NULL;
universe@571:     }
universe@571: 
universe@727:     struct cx_mempool_s *pool =
universe@727:             malloc(sizeof(struct cx_mempool_s));
universe@571:     if (pool == NULL) {
universe@571:         return NULL;
universe@571:     }
universe@571: 
universe@571:     CxAllocator *provided_allocator = malloc(sizeof(CxAllocator));
universe@727:     if (provided_allocator == NULL) {
universe@571:         free(pool);
universe@571:         return NULL;
universe@571:     }
universe@727:     provided_allocator->cl = &cx_mempool_allocator_class;
universe@571:     provided_allocator->data = pool;
universe@571: 
universe@727:     pool->allocator = provided_allocator;
universe@571: 
universe@571:     pool->data = malloc(poolsize);
universe@571:     if (pool->data == NULL) {
universe@571:         free(provided_allocator);
universe@571:         free(pool);
universe@571:         return NULL;
universe@571:     }
universe@571: 
universe@727:     pool->size = 0;
universe@727:     pool->capacity = capacity;
universe@727:     pool->auto_destr = destr;
universe@571: 
universe@571:     return (CxMempool *) pool;
universe@571: }