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Removed int-to-void-pointer-cast warnings, added comments

master
TuDatTr 2021-01-24 22:35:46 +01:00
parent a8a03d0d36
commit 921a49c0fc
2 changed files with 49 additions and 17 deletions
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4
Makefile
View File

@ -2,8 +2,8 @@
# Students' Makefile for the Malloc Lab
#
CC = gcc
CFLAGS = -Wall -O2 -m32
# CFLAGS = -Wall -O0 -m32 -g03 -pg
# CFLAGS = -Wall -O2 -m32
CFLAGS = -Wall -O0 -m32 -g03 -pg
OBJS = mdriver.o mm.o memlib.o fsecs.o fcyc.o clock.o ftimer.o

62
mm.c
View File

@ -102,7 +102,7 @@ team_t team = {
#define NEXT_BLKP(bp) ((char *)(bp) + GET_SIZE(((char *)(bp) - WSIZE)))
#define PREV_BLKP(bp) ((char *)(bp) - GET_SIZE(((char *)(bp) - DSIZE)))
#define PUT_PTR(p, ptr) (*(unsigned int *)(p) = (unsigned int)(ptr))
#define PUT_PTR(p, ptr) (*(unsigned int *)(p) = (size_t)(ptr))
#define PRV_PTR(ptr) ((char *)(ptr))
#define NXT_PTR(ptr) ((char *)(ptr) + WSIZE)
@ -120,11 +120,50 @@ char* seg_list[LISTSIZE];
////////////////////////////////////////////////////////////////////////////////
///////////////////////////////// HELPER PREDEF ////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
/**
@brief Extends the memory of the heap by the specified amount.
@param[in] size amount of memory to extend heap by
@result Pointer to the newly allocated memory area.
*/
static void *extend_heap(size_t size);
/**
@brief Adds a free memory location to the segregated list.
@param[in] ptr Pointer of the memory location to be added
@param[in] size size of the area that would be occupied
*/
static void add_free(void *ptr, size_t size);
/**
@brief Removes a free memory location to the segregated list.
@param[in] ptr Pointer of the memory location to be removed
*/
static void remove_free(void *ptr);
/**
@brief Coalesce memory areas around the given pointer, given that they're free.
@param[in] ptr Memory area to look into.
*/
static void *coalesce(void *ptr);
/**
@brief Places The header and footer for our memory blocks.
@param[in] ptr pointer to the memory block that's allocated
@param[in] asize size of memory to allocate
*/
static void *place(void *ptr, size_t asize);
/**
@brief Get the size class of the given size inside of the segregated list
@param[in] asize size class to look for in segregated list
@result Size class (i.e. index of segregated list)
*/
static int getSzClass(size_t asize);
////////////////////////////////////////////////////////////////////////////////
@ -253,27 +292,20 @@ static void *coalesce(void *ptr) {
static void *place(void *ptr, size_t asize) {
size_t ptr_size = GET_SIZE(HDRP(ptr));
size_t remainder = ptr_size - asize;
size_t rest = ptr_size - asize;
remove_free(ptr);
if (remainder <= DSIZE * 2) {
if (rest <= DSIZE * 2) {
PUT(HDRP(ptr), PACK(ptr_size, 1));
PUT(FTRP(ptr), PACK(ptr_size, 1));
}
else if (asize >= 100) {
PUT(HDRP(ptr), PACK(remainder, 0));
PUT(FTRP(ptr), PACK(remainder, 0));
} else {
PUT(HDRP(ptr), PACK(rest, 0));
PUT(FTRP(ptr), PACK(rest, 0));
PUT(HDRP(NEXT_BLKP(ptr)), PACK(asize, 1));
PUT(FTRP(NEXT_BLKP(ptr)), PACK(asize, 1));
add_free(ptr, remainder);
add_free(ptr, rest);
return NEXT_BLKP(ptr);
} else {
PUT(HDRP(ptr), PACK(asize, 1));
PUT(FTRP(ptr), PACK(asize, 1));
PUT(HDRP(NEXT_BLKP(ptr)), PACK(remainder, 0));
PUT(FTRP(NEXT_BLKP(ptr)), PACK(remainder, 0));
add_free(NEXT_BLKP(ptr), remainder);
}
return ptr;
}
@ -331,7 +363,7 @@ void *mm_malloc(size_t size)
for (int i = 0;i < LISTSIZE; ++i) {
if ((i == LISTSIZE-1) || ((sz < 2) && (seg_list[i] != NULL))) {
ptr = seg_list[i];
while ((ptr != NULL) && (asize > GET_SIZE(HDRP(ptr))))
while (!((ptr == NULL) || (asize <= GET_SIZE(HDRP(ptr)))))
{
ptr = PRV_BLK(ptr);
}