Example of using the --info linker option
This is an example of the output generated by the
To display the component sizes when linking enter:
armlink --info sizes …
sizes gives a list of the Code and
data sizes for each input object and library member in the image. Using this option implies
The following example shows the output in tabular format with the totals separated out for easy reading:
Code (inc. data) RO Data RW Data ZI Data Debug 3712 1580 19 44 10200 7436 Object Totals 0 0 16 0 0 0 (incl. Generated) 0 0 3 0 0 0 (incl. Padding) 21376 648 805 4 300 10216 Library Totals 0 0 6 0 0 0 (incl. Padding) =============================================================================== Code (inc. data) RO Data RW Data ZI Data Debug 25088 2228 824 48 10500 17652 Grand Totals 25088 2228 824 48 10500 17652 ELF Image Totals 25088 2228 824 48 0 0 ROM Totals =============================================================================== Total RO Size (Code + RO Data) 25912 ( 25.30kB) Total RW Size (RW Data + ZI Data) 10548 ( 10.30kB) Total ROM Size (Code + RO Data + RW Data) 25960 ( 25.35kB)
In this example:
- Code (inc. data)
Shows how many bytes are occupied by code. In this image, there are 3712 bytes of code. This includes 1580 bytes of inline data (
inc. data), for example, literal pools, and short strings.
- RO Data
Shows how many bytes are occupied by RO data. This is in addition to the inline data included in the
Code (inc. data)column.
- RW Data
Shows how many bytes are occupied by RW data.
- ZI Data
Shows how many bytes are occupied by ZI data.
Shows how many bytes are occupied by debug data, for example, debug input sections and the symbol and string table.
- Object Totals
Shows how many bytes are occupied by objects linked together to generate the image.
- (incl. Generated)
armlink might generate image contents, for example, interworking veneers, and input sections such as region tables. If the
Object Totalsrow includes this type of data, it is shown in this row.
In the example, there are 19 bytes of RO data in total, of which 16 bytes is linker-generated RO data.
- Library Totals
Shows how many bytes are occupied by library members that have been extracted and added to the image as individual objects.
- (incl. Padding)
armlink inserts padding, if required, to force section alignment. If the
Object Totalsrow includes this type of data, it is shown in the associated
(incl. Padding)row. Similarly, if the
Library Totalsrow includes this type of data, it is shown in its associated row.
In the example, there are 19 bytes of RO data in the object total, of which 3 bytes is linker-generated padding, and 805 bytes of RO data in the library total, with 6 bytes of padding.
- Grand Totals
Shows the true size of the image. In the example, there are 10200 bytes of ZI data (in
Object Totals) and 300 of ZI data (in
Library Totals)giving a total of 10500 bytes.
- ELF Image Totals
If you are using RW data compression (the default) to optimize ROM size, the size of the final image changes and this is reflected in the output from
--info. Compare the number of bytes under
ELF Image Totalsto see the effect of compression.
In the example, RW data compression is not enabled. If data is compressed, the RW value changes.
- ROM Totals
Shows the minimum size of ROM required to contain the image. This does not include ZI data and debug information which is not stored in the ROM.