Atmel CAVR-4 Manual De Usuario

CAVR-4

Data segments

Reference Guide

The heap contains dynamic data allocated by use of the C function 

malloc

 (or one of 

its relatives) or the C++ operator 

new

. 

If your application uses dynamic memory allocation, you should be familiar with the 
following:

●

Linker segment used for the heap, which differs between the DLIB and the CLIB 
runtime environment

●

Allocating the heap size, which differs depending on which build interface you are 
using

●

Placing the heap segments in memory.

Heaps can be placed in the following memory types:

TINY_HEAP

To access a heap in a specific memory, use the appropriate memory attribute as a prefix 
to the standard functions 

malloc

, 

free

, 

calloc

, and 

realloc

, for example:

_ _near_malloc

If you use any of the standard functions without a prefix, the function will be mapped to 
the default memory type near.

Each heap will reside in a segment with the name 

_HEAP

 prefixed by a memory attribute.

For information about how to access a heap in a specific memory using C++, see New 
and Delete operators, page 114.

The memory allocated to the heap is placed in the segment 

HEAP

, which is only included 

in the application if dynamic memory allocation is actually used.

Tiny

TINY_HEAP

*

_ _tiny

Near

NEAR_HEAP

_ _near

Far

FAR_HEAP

_ _far

Huge

HUGE_HEAP

_ _huge