/*
* "Reallocate" a piece of memory.
*
* If the new size is <= the old size, we return the original pointer
* without doing anything.
*
* If the new size is > the old size, we allocate new storage, copy the
* old stuff over, and mark the new stuff as free.
*/
void* dvmLinearRealloc(Object* classLoader, void* mem, size_t newSize)
{
#ifdef DISABLE_LINEAR_ALLOC
return realloc(mem, newSize);
#endif
LinearAllocHdr* pHdr = getHeader(classLoader);
/* make sure we have the right region (and mem != NULL) */
assert(mem != NULL);
assert(mem >= (void*) pHdr->mapAddr &&
mem < (void*) (pHdr->mapAddr + pHdr->curOffset));
const u4* pLen = getBlockHeader(mem);
LOGV("--- LinearRealloc(%d) old=%d\n", newSize, *pLen);
/* handle size reduction case */
if (*pLen >= newSize) {
if (ENFORCE_READ_ONLY)
dvmLinearSetReadWrite(classLoader, mem);
return mem;
}
void* newMem;
newMem = dvmLinearAlloc(classLoader, newSize);
assert(newMem != NULL);
memcpy(newMem, mem, *pLen);
dvmLinearFree(classLoader, mem);
return newMem;
}
/*
* Mark an allocation as free.
*/
void dvmLinearFree(Object *classLoader, void *mem) {
#ifdef DISABLE_LINEAR_ALLOC
free(mem);
return;
#endif
if (mem == NULL)
return;
/* make sure we have the right region */
assert(mem >= (void *) getHeader(classLoader)->mapAddr &&
mem < (void *) (getHeader(classLoader)->mapAddr +
getHeader(classLoader)->curOffset));
if (ENFORCE_READ_ONLY)
dvmLinearSetReadWrite(classLoader, mem);
u4 *pLen = getBlockHeader(mem);
*pLen |= LENGTHFLAG_FREE;
if (ENFORCE_READ_ONLY)
dvmLinearSetReadOnly(classLoader, mem);
}
