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py: Clean up edge cases of malloc/realloc/free.

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This commit is contained in:
Damien George 2014-10-23 12:02:00 +01:00
parent f5d69794a8
commit 37378f8a9d
2 changed files with 20 additions and 28 deletions
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6
py/gc.c
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@ -546,6 +546,12 @@ void *gc_realloc(void *ptr_in, mp_uint_t n_bytes) {
return gc_alloc(n_bytes, false);
}
// check for pure free
if (n_bytes == 0) {
gc_free(ptr_in);
return NULL;
}
mp_uint_t ptr = (mp_uint_t)ptr_in;
// sanity check the ptr

42
py/malloc.c
View File

@ -63,11 +63,8 @@ STATIC size_t peak_bytes_allocated = 0;
#endif // MICROPY_ENABLE_GC
void *m_malloc(size_t num_bytes) {
if (num_bytes == 0) {
return NULL;
}
void *ptr = malloc(num_bytes);
if (ptr == NULL) {
if (ptr == NULL && num_bytes != 0) {
return m_malloc_fail(num_bytes);
}
#if MICROPY_MEM_STATS
@ -81,9 +78,6 @@ void *m_malloc(size_t num_bytes) {
void *m_malloc_maybe(size_t num_bytes) {
void *ptr = malloc(num_bytes);
if (ptr == NULL) {
return NULL;
}
#if MICROPY_MEM_STATS
total_bytes_allocated += num_bytes;
current_bytes_allocated += num_bytes;
@ -95,11 +89,8 @@ void *m_malloc_maybe(size_t num_bytes) {
#if MICROPY_ENABLE_FINALISER
void *m_malloc_with_finaliser(size_t num_bytes) {
if (num_bytes == 0) {
return NULL;
}
void *ptr = malloc_with_finaliser(num_bytes);
if (ptr == NULL) {
if (ptr == NULL && num_bytes != 0) {
return m_malloc_fail(num_bytes);
}
#if MICROPY_MEM_STATS
@ -114,19 +105,16 @@ void *m_malloc_with_finaliser(size_t num_bytes) {
void *m_malloc0(size_t num_bytes) {
void *ptr = m_malloc(num_bytes);
if (ptr != NULL) {
memset(ptr, 0, num_bytes);
if (ptr == NULL && num_bytes != 0) {
return m_malloc_fail(num_bytes);
}
memset(ptr, 0, num_bytes);
return ptr;
}
void *m_realloc(void *ptr, size_t old_num_bytes, size_t new_num_bytes) {
if (new_num_bytes == 0) {
free(ptr);
return NULL;
}
void *new_ptr = realloc(ptr, new_num_bytes);
if (new_ptr == NULL) {
if (new_ptr == NULL && new_num_bytes != 0) {
return m_malloc_fail(new_num_bytes);
}
#if MICROPY_MEM_STATS
@ -146,28 +134,26 @@ void *m_realloc(void *ptr, size_t old_num_bytes, size_t new_num_bytes) {
void *m_realloc_maybe(void *ptr, size_t old_num_bytes, size_t new_num_bytes) {
void *new_ptr = realloc(ptr, new_num_bytes);
if (new_ptr == NULL) {
return NULL;
}
#if MICROPY_MEM_STATS
// At first thought, "Total bytes allocated" should only grow,
// after all, it's *total*. But consider for example 2K block
// shrunk to 1K and then grown to 2K again. It's still 2K
// allocated total. If we process only positive increments,
// we'll count 3K.
size_t diff = new_num_bytes - old_num_bytes;
total_bytes_allocated += diff;
current_bytes_allocated += diff;
UPDATE_PEAK();
// Also, don't count failed reallocs.
if (!(new_ptr == NULL && new_num_bytes != 0)) {
size_t diff = new_num_bytes - old_num_bytes;
total_bytes_allocated += diff;
current_bytes_allocated += diff;
UPDATE_PEAK();
}
#endif
DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, old_num_bytes, new_num_bytes, new_ptr);
return new_ptr;
}
void m_free(void *ptr, size_t num_bytes) {
if (ptr != NULL) {
free(ptr);
}
free(ptr);
#if MICROPY_MEM_STATS
current_bytes_allocated -= num_bytes;
#endif