// Reallocate storage in Arena.
void *Arena::Arealloc(void* old_ptr, size_t old_size, size_t new_size) {
assert(new_size >= 0, "bad size");
if (new_size == 0) return NULL;
#ifdef ASSERT
if (UseMallocOnly) {
// always allocate a new object (otherwise we'll free this one twice)
char* copy = (char*)Amalloc(new_size);
size_t n = MIN2(old_size, new_size);
if (n > 0) memcpy(copy, old_ptr, n);
return copy;
}
#endif
char *c_old = (char*)old_ptr; // Handy name
// Stupid fast special case
if( new_size <= old_size ) { // Shrink in-place
if( c_old+old_size == _hwm) // Attempt to free the excess bytes
_hwm = c_old+new_size; // Adjust hwm
return c_old;
}
// make sure that new_size is legal
size_t corrected_new_size = ARENA_ALIGN(new_size);
// See if we can resize in-place
if( (c_old+old_size == _hwm) && // Adjusting recent thing
(c_old+corrected_new_size <= _max) ) { // Still fits where it sits
_hwm = c_old+corrected_new_size; // Adjust hwm
return c_old; // Return old pointer
}
// Oops, got to relocate guts
void *new_ptr = Amalloc(new_size);
memcpy( new_ptr, c_old, old_size );
Afree(c_old,old_size); // Mostly done to keep stats accurate
return new_ptr;
}
//------------------------------realloc----------------------------------------
// Reallocate storage in Arena.
void *Arena::Arealloc( void *old_ptr, size_t old_size, size_t new_size ) {
char *c_old = (char*)old_ptr; // Handy name
// Stupid fast special case
if( new_size <= old_size ) { // Shrink in-place
if( c_old+old_size == _hwm) // Attempt to free the excess bytes
_hwm = c_old+new_size; // Adjust hwm
return c_old;
}
// See if we can resize in-place
if( (c_old+old_size == _hwm) && // Adjusting recent thing
(c_old+new_size <= _max) ) { // Still fits where it sits
_hwm = c_old+new_size; // Adjust hwm
return c_old; // Return old pointer
}
// Oops, got to relocate guts
void *new_ptr = Amalloc(new_size);
memcpy( new_ptr, c_old, old_size );
Afree(c_old,old_size); // Mostly done to keep stats accurate
return new_ptr;
}
//------------------------------calloc-----------------------------------------
// Allocate zeroed storage in Arena
void *Arena::Acalloc( size_t items, size_t x ) {
size_t z = items*x; // Total size needed
void *ptr = Amalloc(z); // Get space
memset( ptr, 0, z ); // Zap space
return ptr; // Return space
}
