Question

I am trying parse a map file that is generated by gcc, for function addresses. There is a possible solution here(python), but it’s not working for me.

I am trying to understand the solution provided. It has got two complex regular expressions..

m = re.search('^\[([0-9 ]+)\]\s+(.+)\s*$',line )
m = re.search('^([0-9A-Fx]+)\s+([0-9A-Fx]+)\s+(\[([ 0-9]+)\]|\w+)\s+(.*?)\s*$', line)

Can any one explain me what is the RE searching for ?

Is there any other working solution to get function addresses from gcc produced mapfile ?

Answer 1

^\[([0-9 ]+)\]\s+(.+)\s*$

^                  start of the line
\[                 literal [
([0-9 ]+)          group of 0-9 or space, one or more times
\]                 literal ]
\s+                one or more spaces
(.+)               group of anything one or moretimes
\s*                zero or more spaces 
$                  end of line


eg: "[5 5 5] blah"

gives:
    group1 = "5 5 5"
    group2 = blah

^([0-9A-Fx]+)\s+([0-9A-Fx]+)\s+(\[([ 0-9]+)\]|\w+)\s+(.*?)\s*$

^                  start of line
([0-9A-Fx]+)       group of chars one or more times
\s+                one or more spaces
([0-9A-Fx]+)       group of chars one or more times
\s+                one or more spaces
(
    \[             literal [
    ([ 0-9]+)      group of char 1 or more times
    \]             literal [
    |              or
    \w+            word char, one or more times
)
\s+                one or more spaces
(.*?)              any char zero or more times, non greedy
\s*                zero or more spaces
$                  end of line