How to get Data Segment Size in C++

Question

I need to do analysis of memory requirements of one library written in C++, because HW engineers need get some idea about memory requirements of our hardware, there are working on. I can measure heapsize peak, I can measure stack size, but I don't know how to estimate/measure data segment size and Bss size. Is there any method in Visual Studio or GCC? I assume it will differs from compiler to compiler and from platform to platform, but an estimation is fine for me.

Have you tried just cross-compiling to your target platform and checking the produced binaries? — harald, Mar 02 '15 at 13:23
GCC (pedantically, GNU binutils) has a tool called [`size`](http://linux.die.net/man/1/size) for this. — Mike Seymour, Mar 02 '15 at 13:28
I can cross-compile it for ARM in IAR Workbench. Do you mean that it should be possible to detect this from this IDE/tool somehow? — Tomas Kubes, Mar 02 '15 at 13:29

score 4 · Answer 1 · answered Mar 02 '15 at 13:28

There is a size utility. E.g. for ARM MCU project it can be something like:

arm-none-eabi-size --format=sysv "program_name.elf"

Example output:

program_name.elf  :
section             size        addr
.text              14516           0
.data                160   268435456
.bss                1328   268435616
.stack              2528   268436944
.debug_aranges      2384           0
.debug_info        40951           0
.debug_abbrev       8870           0
.debug_line        27790           0
.debug_frame        6664           0
.debug_str         42157           0
.debug_loc          7074           0
.debug_macinfo    426030           0
.ARM.attributes       47           0
.debug_ranges       1760           0
.comment              96           0
.debug_macro        9236           0
Total             591591

score 2 · Accepted Answer · answered Mar 02 '15 at 13:28

2

During the build:

For VC++ run link.exe /map.
For GCC run ld -Map.

Both options generate a map file which will contain the segment sizes.

answered Mar 02 '15 at 13:28

Remus Rusanu

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score 2 · Answer 3 · edited May 23 '17 at 11:47

2

You can use objdump to get the size of the text, data and bss segments on Linux systems. You can examine the output for the .bss and .text sections.

See here for a more detailed explanation.

edited May 23 '17 at 11:47

Community

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answered Mar 02 '15 at 13:30

Alexandru C.

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How to get Data Segment Size in C++

3 Answers3