87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
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// Copyright (c) 2025, Zak Fenton
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// Zak Fenton's libc is licensed under the Mulan PSL v2. You can use this
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// software according to the terms and conditions of the Mulan PSL v2.
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// You may obtain a copy of Mulan PSL v2 at:
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// http://license.coscl.org.cn/MulanPSL2
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// THIS SOFTWARE IS PROVIDED ON AN “AS IS” BASIS, WITHOUT warranties of
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// any kind, either express or implied, including but not limited to
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// non-infringement, merchantability or fit for a particular purpose.
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// See the Mulan PSL v2 for more details.
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#include <memory.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <syscalls.h>
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#include "elmalloc.h"
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#include "internal.h"
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elmm_t _libc_mm;
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elmm_sbrk_data_t _libc_sbrkdata;
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#define SIMGC_SYSMALLOC(x) elmm_malloc(&_libc_mm, x)
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#define SIMGC_FREE(x) elmm_free(&_libc_mm, x)
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#define SIMGC_IMPLEMENTATION
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#include "simgc.h"
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simgc_t _libc_gc;
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simgc_thread_t* _libc_gcmainthread;
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void _libc_malloc_init(void* stackptr) {
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// Initialising the memory manager is currently a bit of work, but in
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// theory should pay off as the memory manager code is easy to fine
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// tune and adapt for more specialised allocators.
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_libc_sbrkdata.func = (void*)(&sbrk); // Hooking it straight to the syscall should work, the userdata argument will be ignored
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_libc_sbrkdata.max = 1024 * 1024 * 8;
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_libc_sbrkdata.onlyChunk = NULL;
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_libc_sbrkdata.udata = NULL;
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_libc_mm.bigchunkMinimum = 1024 * 1024;
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_libc_mm.bigchunkGranularity = 1024;
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_libc_mm.initialised = false;
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_libc_mm.lockFunction = NULL;
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_libc_mm.bigchunkData = &_libc_sbrkdata;
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_libc_mm.bigchunkFunction = &elmm_bigchunk_sbrk;
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if (!elmm_init(&_libc_mm)) {
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const char* err = "ERROR: Failed to initialise memory manager!\n";
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write(2, err, strlen(err));
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exit(-1);
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}
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if (!elmm_growheap(&_libc_mm, 1024*1024*4)) {
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printf("Growheap failed.\n");
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} else {
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printf("Growheap success!\n");
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}
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simgc_init(&_libc_gc);
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_libc_gcmainthread = simgc_begin_inner(&_libc_gc, stackptr);
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}
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void _libc_malloc_finish() {
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simgc_end_inner(_libc_gcmainthread);
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simgc_reclaim(&_libc_gc);
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}
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void* _libc_gcalloc(size_t sz) {
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return simgc_alloc(&_libc_gc, sz);
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}
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void* malloc(size_t sz) {
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return elmm_malloc(&_libc_mm, sz);
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}
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void free(void* mem) {
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return elmm_free(&_libc_mm, mem);
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}
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void* calloc(size_t n, size_t sz) {
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/* TODO: check for overflow of n * sz? Probably not a problem IRL (may
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* have been more of a thing back in the 16-bit era but I guess math
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* overflow is not an important issue on 64-bit or even 32-bit memory
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* allocator calls)
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*/
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return elmm_calloc(&_libc_mm, n, sz);
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}
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void* realloc(void* mem, size_t sz) {
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return elmm_realloc(&_libc_mm, mem, sz);
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}
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