feat: partially implemented malloc and free
This commit is contained in:
parent
ecfd233c30
commit
73f577fb7a
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@ -17,7 +17,7 @@ INC := -I $(INCD)
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CFLAGS := -Wall -Werror -Wno-unused-function -MMD
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COLORF := -DCOLOR
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DFLAGS := -g -DDEBUG -DCOLOR
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DFLAGS := -g -DDEBUG -DCOLOR -DWEAK_MAGIC
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PRINT_STAMENTS := -DERROR -DSUCCESS -DWARN -DINFO
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STD := -std=c99
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@ -315,8 +315,12 @@ void *sf_mem_grow();
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*/
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sf_header sf_magic();
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#define MAGIC (sf_magic())
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//#define MAGIC (sf_magic())
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#ifndef WEAK_MAGIC
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#define MAGIC (sf_magic())
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#else
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#define MAGIC ((sf_header)0x0)
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#endif
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/*
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* Set the "magic number" used to obfuscate header and footer contents.
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* Setting the magic number to zero essentially turns off obfuscation, which will
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@ -2,13 +2,17 @@
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#include "sfmm.h"
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int main(int argc, char const *argv[]) {
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sf_set_magic(0x0);
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double* ptr = sf_malloc(sizeof(double));
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*ptr = 320320320e-320;
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*ptr = 114514;
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printf("%f\n", *ptr);
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sf_free(ptr);
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sf_show_heap();
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sf_show_free_lists();
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return EXIT_SUCCESS;
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}
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337
hw3/src/sfmm.c
337
hw3/src/sfmm.c
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@ -7,28 +7,347 @@
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#include <string.h>
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#include "debug.h"
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#include "sfmm.h"
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#include "errno.h"
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void *sf_malloc(sf_size_t size) {
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static sf_size_t min = 32;
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static sf_block *pro;
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static sf_block *epi;
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static sf_size_t in_qklst = 0x00000001;
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static sf_size_t prv_alloc = 0x00000002;
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static sf_size_t alloc = 0x00000004;
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int sf_initialize();
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void set_header(sf_block *block, sf_header value);
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void set_entire_header(sf_block *block, sf_size_t paylod_size, sf_size_t block_size,
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sf_size_t is_alloc, sf_size_t is_prv_alloc, sf_size_t is_in_qklst);
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void set_payload_size(sf_block *block, sf_size_t payload_size);
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void set_block_size(sf_block *block, sf_size_t block_size);
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void set_alloc(sf_block *block, sf_size_t is_alloc);
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void set_prv_alloc(sf_block *block, sf_size_t is_prv_allc);
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void set_in_qklst(sf_block *block, sf_size_t is_qklst);
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sf_size_t get_payload_size(sf_header header);
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sf_size_t get_block_size(sf_header header);
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sf_size_t get_alloc(sf_header header);
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sf_size_t get_prv_alloc(sf_header header);
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sf_size_t get_in_qklst(sf_header header);
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void put_block(sf_block *block);
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sf_size_t get_min_size(sf_size_t size);
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sf_size_t get_index(sf_size_t size);
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sf_size_t get_size_of_index(sf_size_t index);
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sf_block *split_block(sf_block *block, size_t size);
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void valid_pointer(sf_block *pp);
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void release_block(sf_block *block);
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void *sf_malloc(sf_size_t size)
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{
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if (size == 0)
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return NULL;
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if (sf_mem_start() == sf_mem_end())
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if (sf_initialize())
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return NULL;
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sf_size_t min_size = get_min_size(size);
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sf_size_t index = (min_size - 32) / 16;
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if (index < 10)
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if (sf_quick_lists[index].length > 0)
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{
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sf_block *block = sf_quick_lists[index].first;
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sf_quick_lists[index].length -= 1;
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sf_quick_lists[index].first = block->body.links.next;
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return block;
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}
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index = get_index(min_size);
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for (size_t i = index; i < NUM_FREE_LISTS; i++)
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{
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sf_block *header = &sf_free_list_heads[i];
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sf_block *ptr = header->body.links.next;
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if (i == index)
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{
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while (ptr != header)
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{
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if (get_block_size(ptr->header) >= min_size)
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{
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set_entire_header(ptr, size, get_block_size(ptr->header), 1, 0, 0);
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return ptr->body.payload;
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}
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}
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}
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else
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{
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while (ptr != header)
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{
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if (get_block_size(ptr->header) - min_size > get_size_of_index(i))
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{
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sf_block *block = split_block(ptr, min_size);
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sf_size_t block_size = get_block_size(block->header);
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set_entire_header(block, size, block_size, 1, 0, 0);
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sf_show_block(block);
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sf_show_block(ptr);
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return block->body.payload;
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}
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}
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}
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}
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// TO BE IMPLEMENTED
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return NULL;
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}
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void sf_free(void *pp)
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{
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sf_block *block = (sf_block *)(intptr_t)(pp - 2 * sizeof(sf_header));
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valid_pointer(block);
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sf_size_t index = (get_block_size(block->header) - 32) / 16;
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if (index < 10)
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{
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set_entire_header(block, 0, get_block_size(block->header), 1, get_prv_alloc(block->header), 1);
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if (sf_quick_lists[index].length >= 5)
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{
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sf_block *ptr = sf_quick_lists[index].first;
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while (ptr != NULL)
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{
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sf_block *tmp = ptr;
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ptr = ptr->body.links.next;
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release_block(tmp);
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}
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sf_quick_lists[index].length = 0;
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sf_quick_lists->first = NULL;
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}
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block->body.links.next = sf_quick_lists[index].first;
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sf_quick_lists[index].length += 1;
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sf_quick_lists[index].first = block;
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return;
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}
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release_block(block);
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}
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void *sf_realloc(void *pp, sf_size_t rsize)
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{
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// TO BE IMPLEMENTED
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abort();
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}
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void sf_free(void *pp) {
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double sf_internal_fragmentation()
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{
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// TO BE IMPLEMENTED
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abort();
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}
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void *sf_realloc(void *pp, sf_size_t rsize) {
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double sf_peak_utilization()
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{
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// TO BE IMPLEMENTED
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abort();
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}
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double sf_internal_fragmentation() {
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// TO BE IMPLEMENTED
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abort();
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int sf_initialize()
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{
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if (sf_mem_grow() == NULL)
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{
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sf_errno = ENOMEM;
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return 1;
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}
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pro = (sf_block *)sf_mem_start();
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set_entire_header(pro, 0, 32, 1, 0, 0);
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epi = (sf_block *)((intptr_t)sf_mem_end() - 2 * sizeof(sf_header));
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set_entire_header(epi, 0, 0, 1, 1, 0);
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for (size_t i = 0; i < NUM_FREE_LISTS; i++)
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{
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sf_free_list_heads[i].body.links.prev = &sf_free_list_heads[i];
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sf_free_list_heads[i].body.links.next = &sf_free_list_heads[i];
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}
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for (size_t i = 0; i < NUM_QUICK_LISTS; i++)
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{
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sf_quick_lists[i].length = 0;
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sf_quick_lists[i].first = NULL;
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}
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sf_block *block = (sf_block *)((intptr_t)sf_mem_start() + 4 * sizeof(sf_header));
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sf_size_t size = PAGE_SZ - 6 * sizeof(sf_header);
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set_entire_header(block, 0, size, 0, 1, 0);
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put_block(block);
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return 0;
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}
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double sf_peak_utilization() {
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// TO BE IMPLEMENTED
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abort();
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sf_size_t get_min_size(sf_size_t size)
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{
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if (size <= 16)
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return min;
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else
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return size % 16 == 0 ? size + 16 : (size + 32) - (size % 16);
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}
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void set_header(sf_block *block, sf_header value)
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{
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block->header = value;
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if (get_alloc(block->header) == 0)
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{
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sf_block *next = (sf_block *)((intptr_t)block + get_block_size(block->header));
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next->prev_footer = block->header;
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}
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}
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void set_entire_header(sf_block *block, sf_size_t paylod_size, sf_size_t block_size,
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sf_size_t is_alloc, sf_size_t is_prv_alloc, sf_size_t is_in_qklst)
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{
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set_payload_size(block, paylod_size);
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set_block_size(block, block_size);
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set_alloc(block, is_alloc);
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set_prv_alloc(block, is_prv_alloc);
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set_in_qklst(block, is_in_qklst);
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}
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void set_payload_size(sf_block *block, sf_size_t payload_size)
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{
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sf_header value = (block->header & 0x00000000FFFFFFFF) | (uint64_t)payload_size << 32;
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set_header(block, value);
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}
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void set_block_size(sf_block *block, sf_size_t block_size)
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{
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sf_header value = (block->header & 0xFFFFFFFF0000000F) | (uint64_t)block_size;
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set_header(block, value);
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}
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void set_alloc(sf_block *block, sf_size_t is_alloc)
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{
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sf_header value = block->header;
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if (is_alloc)
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{
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value |= alloc;
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}
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else
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{
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value &= ~alloc;
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}
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set_header(block, value);
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}
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void set_prv_alloc(sf_block *block, sf_size_t is_prv_allc)
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{
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sf_header value = block->header;
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if (is_prv_allc)
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{
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value |= prv_alloc;
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}
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else
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{
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value &= ~prv_alloc;
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}
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set_header(block, value);
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}
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void set_in_qklst(sf_block *block, sf_size_t is_in_qklst)
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{
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sf_header value = block->header;
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if (is_in_qklst)
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{
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value |= in_qklst;
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}
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else
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{
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value &= ~in_qklst;
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}
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set_header(block, value);
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}
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sf_size_t get_payload_size(sf_header header)
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{
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return ((uint64_t)header & 0xFFFFFFFF00000000) >> 32;
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}
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sf_size_t get_block_size(sf_header header)
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{
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return ((uint64_t)header & 0x00000000FFFFFFF0);
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}
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sf_size_t get_alloc(sf_header header)
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{
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return ((uint64_t)header & alloc) ? 1 : 0;
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}
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sf_size_t get_prv_alloc(sf_header header)
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{
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return ((uint64_t)header & prv_alloc) ? 1 : 0;
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}
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sf_size_t get_in_qklst(sf_header header)
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{
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return ((uint64_t)header & in_qklst) ? 1 : 0;
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}
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void put_block(sf_block *block)
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{
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sf_size_t index = get_index(get_block_size(block->header));
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sf_block *header = &sf_free_list_heads[index];
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block->body.links.prev = header;
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block->body.links.next = header->body.links.next;
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header->body.links.next->body.links.prev = block;
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header->body.links.next = block;
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}
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sf_size_t get_index(sf_size_t size)
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{
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size /= 32;
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size_t index = 0;
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for (; index < (NUM_FREE_LISTS - 1); index++, size /= 2)
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if (size == 1)
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break;
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return index;
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}
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sf_size_t get_size_of_index(sf_size_t index)
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{
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return 16 << index;
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}
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sf_block *split_block(sf_block *block, size_t size)
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{
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size_t original_size = get_block_size(block->header);
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size_t new_size = original_size - size;
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set_block_size(block, new_size);
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sf_block *ptr = (sf_block *)((intptr_t)block + get_block_size(block->header));
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set_entire_header(ptr, 0, size, 0, 0, 0);
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ptr->prev_footer = block->header;
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return ptr;
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}
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void valid_pointer(sf_block *pp)
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{
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if (pp == NULL || (intptr_t)pp % 16 != 0)
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abort();
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// pp->header ^= sf_magic();
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if (get_block_size(pp->header) < 32 || get_block_size(pp->header) % 16 != 0)
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abort();
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if ((intptr_t)&pp->header < ((intptr_t)&pro->header + 32) || (intptr_t)&pp->header > ((intptr_t)&epi->header - 8))
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abort();
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if (get_alloc(pp->header) == 0 || (get_prv_alloc(pp->header) == 0 && get_alloc(pp->prev_footer) != 0))
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abort();
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return;
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}
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void release_block(sf_block *block)
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{
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sf_block *next = (sf_block *)((intptr_t)block + get_block_size(block->header));
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sf_block *prev = (sf_block *)((intptr_t)block - get_block_size(block->prev_footer));
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sf_size_t total_size = get_block_size(block->header);
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if (get_alloc(next->header) == 0)
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{
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next->body.links.prev->body.links.next = next->body.links.next;
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next->body.links.next->body.links.prev = next->body.links.prev;
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total_size += get_block_size(next->header);
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}
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if (get_alloc(block->prev_footer) == 0)
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{
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prev->body.links.prev->body.links.next = prev->body.links.next;
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prev->body.links.next->body.links.prev = prev->body.links.prev;
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total_size += get_block_size(prev->header);
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block = prev;
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}
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set_entire_header(block, 0, total_size, 0, get_prv_alloc(block->header), 0);
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put_block(block);
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return;
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}
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