void *drc_cache::alloc_near(size_t bytes)
{
assert(bytes > 0);
// pick first from the free list
if (bytes < MAX_PERMANENT_ALLOC)
{
free_link **linkptr = &m_nearfree[(bytes + CACHE_ALIGNMENT - 1) / CACHE_ALIGNMENT];
free_link *link = *linkptr;
if (link != NULL)
{
*linkptr = link->m_next;
return link;
}
}
// if no space, we just fail
drccodeptr ptr = (drccodeptr)ALIGN_PTR_UP(m_neartop);
if (ptr + bytes > m_base)
return NULL;
// otherwise update the top of the near part of the cache
m_neartop = ptr + bytes;
return ptr;
}
drccodeptr drccache_end_codegen(drccache *cache)
{
drccodeptr result = cache->codegen;
/* run the OOB handlers */
while (cache->ooblist != NULL)
{
/* remove us from the list */
oob_handler *oob = cache->ooblist;
cache->ooblist = oob->next;
/* call the callback */
(*oob->callback)(&cache->top, oob->param1, oob->param2, oob->param3);
assert(cache->top - cache->codegen < CODEGEN_MAX_BYTES);
/* release our memory */
drccache_memory_free(cache, oob, sizeof(*oob));
}
/* update the cache top */
cache->top = (drccodeptr)ALIGN_PTR_UP(cache->top);
cache->codegen = NULL;
return result;
}
void *drccache_memory_alloc_near(drccache *cache, size_t bytes)
{
drccodeptr ptr;
assert(bytes > 0);
/* pick first from the free list */
if (bytes < MAX_PERMANENT_ALLOC)
{
free_link **linkptr = &cache->nearfree[(bytes + CACHE_ALIGNMENT - 1) / CACHE_ALIGNMENT];
free_link *link = *linkptr;
if (link != NULL)
{
*linkptr = link->next;
return link;
}
}
/* if no space, we just fail */
ptr = (drccodeptr)ALIGN_PTR_UP(cache->neartop);
if (ptr + bytes > cache->base)
return NULL;
/* otherwise update the top of the near part of the cache */
cache->neartop = ptr + bytes;
return ptr;
}
void *drc_cache::alloc_temporary(size_t bytes)
{
// can't allocate in the middle of codegen
assert(m_codegen == NULL);
// if no space, we just fail
drccodeptr ptr = m_top;
if (ptr + bytes >= m_end)
return NULL;
// otherwise, update the cache top
m_top = (drccodeptr)ALIGN_PTR_UP(ptr + bytes);
return ptr;
}
void *drccache_memory_alloc_temporary(drccache *cache, size_t bytes)
{
drccodeptr ptr = cache->top;
/* can't allocate in the middle of codegen */
assert(cache->codegen == NULL);
/* if no space, we just fail */
if (ptr + bytes >= cache->end)
return NULL;
/* otherwise, update the cache top */
cache->top = (drccodeptr)ALIGN_PTR_UP(ptr + bytes);
return ptr;
}
drccodeptr drc_cache::end_codegen()
{
drccodeptr result = m_codegen;
// run the OOB handlers
oob_handler *oob;
while ((oob = m_ooblist.detach_head()) != NULL)
{
// call the callback
oob->m_callback(&m_top, oob->m_param1, oob->m_param2);
assert(m_top - m_codegen < CODEGEN_MAX_BYTES);
// release our memory
dealloc(oob, sizeof(*oob));
}
// update the cache top
m_top = (drccodeptr)ALIGN_PTR_UP(m_top);
m_codegen = NULL;
return result;
}