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memory.c
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memory.c
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#include "./header/vmrp.h"
#include "./header/memory.h"
#include "./header/utils.h"
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif
typedef struct {
uint32 next;
uint32 len;
} LG_mem_free_t;
uint32 LG_mem_min; // 从未分配过的长度?
uint32 LG_mem_top; // 动态申请到达的最高内存值
LG_mem_free_t LG_mem_free;
char *LG_mem_base;
uint32 LG_mem_len;
char *Origin_LG_mem_base;
uint32 Origin_LG_mem_len;
char *LG_mem_end;
uint32 LG_mem_left; // 剩余内存
#define realLGmemSize(x) (((x) + 7) & (0xfffffff8))
void initMemoryManager(uint32_t baseAddress, uint32_t len) {
printf("initMemoryManager: baseAddress:0x%X len: 0x%X\n", baseAddress, len);
Origin_LG_mem_base = getMrpMemPtr(baseAddress);
Origin_LG_mem_len = len;
LG_mem_base = (char *)((uint32)(Origin_LG_mem_base + 3) & (~3));
LG_mem_len = (Origin_LG_mem_len - (LG_mem_base - Origin_LG_mem_base)) & (~3);
LG_mem_end = LG_mem_base + LG_mem_len;
LG_mem_free.next = 0;
LG_mem_free.len = 0;
((LG_mem_free_t *)LG_mem_base)->next = LG_mem_len;
((LG_mem_free_t *)LG_mem_base)->len = LG_mem_len;
LG_mem_left = LG_mem_len;
#ifdef MEM_DEBUG
LG_mem_min = LG_mem_len;
LG_mem_top = 0;
#endif
}
#ifdef __EMSCRIPTEN__
EMSCRIPTEN_KEEPALIVE
#endif
void printMemoryInfo() {
printf(".......total:%d, min:%d, free:%d, top:%d\n", LG_mem_len, LG_mem_min, LG_mem_left, LG_mem_top);
printf(".......base:%p, end:%p\n", LG_mem_base, LG_mem_end);
printf(".......obase:%p, olen:%d\n", Origin_LG_mem_base, Origin_LG_mem_len);
}
void *my_malloc(uint32 len) {
LG_mem_free_t *previous, *nextfree, *l;
void *ret;
len = (uint32)realLGmemSize(len);
if (len >= LG_mem_left) {
printf("my_malloc no memory\n");
goto err;
}
if (!len) {
printf("my_malloc invalid memory request");
goto err;
}
if (LG_mem_base + LG_mem_free.next > LG_mem_end) {
printf("my_malloc corrupted memory");
goto err;
}
previous = &LG_mem_free;
nextfree = (LG_mem_free_t *)(LG_mem_base + previous->next);
while ((char *)nextfree < LG_mem_end) {
if (nextfree->len == len) {
previous->next = nextfree->next;
LG_mem_left -= len;
#ifdef MEM_DEBUG
if (LG_mem_left < LG_mem_min)
LG_mem_min = LG_mem_left;
if (LG_mem_top < previous->next)
LG_mem_top = previous->next;
#endif
ret = (void *)nextfree;
goto end;
}
if (nextfree->len > len) {
l = (LG_mem_free_t *)((char *)nextfree + len);
l->next = nextfree->next;
l->len = (uint32)(nextfree->len - len);
previous->next += len;
LG_mem_left -= len;
#ifdef MEM_DEBUG
if (LG_mem_left < LG_mem_min)
LG_mem_min = LG_mem_left;
if (LG_mem_top < previous->next)
LG_mem_top = previous->next;
#endif
ret = (void *)nextfree;
goto end;
}
previous = nextfree;
nextfree = (LG_mem_free_t *)(LG_mem_base + nextfree->next);
}
printf("my_malloc no memory\n");
err:
return 0;
end:
return ret;
}
void my_free(void *p, uint32 len) {
LG_mem_free_t *free, *n;
len = (uint32)realLGmemSize(len);
#ifdef MEM_DEBUG
if (!len || !p || (char *)p < LG_mem_base || (char *)p >= LG_mem_end || (char *)p + len > LG_mem_end || (char *)p + len <= LG_mem_base) {
printf("my_free invalid\n");
printf("p=%d,l=%d,base=%d,LG_mem_end=%d\n", (int32)p, len, (int32)LG_mem_base, (int32)LG_mem_end);
return;
}
#endif
free = &LG_mem_free;
n = (LG_mem_free_t *)(LG_mem_base + free->next);
while (((char *)n < LG_mem_end) && ((void *)n < p)) {
free = n;
n = (LG_mem_free_t *)(LG_mem_base + n->next);
}
#ifdef MEM_DEBUG
if (p == (void *)free || p == (void *)n) {
printf("my_free:already free\n");
return;
}
#endif
if ((free != &LG_mem_free) && ((char *)free + free->len == p)) {
free->len += len;
} else {
free->next = (uint32)((char *)p - LG_mem_base);
free = (LG_mem_free_t *)p;
free->next = (uint32)((char *)n - LG_mem_base);
free->len = len;
}
if (((char *)n < LG_mem_end) && ((char *)p + len == (char *)n)) {
free->next = n->next;
free->len += n->len;
}
LG_mem_left += len;
}
void *my_realloc(void *p, uint32 oldlen, uint32 len) {
unsigned long minsize = (oldlen > len) ? len : oldlen;
void *newblock;
if (p == NULL) {
return my_malloc(len);
}
if (len == 0) {
my_free(p, oldlen);
return NULL;
}
newblock = my_malloc(len);
if (newblock == NULL) {
return newblock;
}
memmove(newblock, p, minsize);
my_free(p, oldlen);
return newblock;
}
#ifdef __EMSCRIPTEN__
EMSCRIPTEN_KEEPALIVE
#endif
void *my_mallocExt(uint32 len) {
uint32 *p;
if (len == 0) {
return NULL;
}
p = my_malloc(len + sizeof(uint32));
if (p) {
*p = len;
return (void *)(p + 1);
}
return p;
}
void *my_mallocExt0(uint32 len) {
uint32 *p = my_mallocExt(len);
if (p) {
memset(p, 0, len);
return p;
}
return p;
}
#ifdef __EMSCRIPTEN__
EMSCRIPTEN_KEEPALIVE
#endif
void my_freeExt(void *p) {
if (p) {
uint32 *t = (uint32 *)p - 1;
my_free(t, *t + sizeof(uint32));
}
}
void *my_reallocExt(void *p, uint32 newLen) {
if (p == NULL) {
return my_mallocExt(newLen);
} else if (newLen == 0) {
my_freeExt(p);
return NULL;
} else {
uint32 oldlen = *((uint32 *)p - 1) + sizeof(uint32);
uint32 minsize = (oldlen < newLen) ? oldlen : newLen;
void *newblock = my_mallocExt(newLen);
if (newblock == NULL) {
return newblock;
}
memmove(newblock, p, minsize);
my_freeExt(p);
return newblock;
}
}