compiler-rt/lib/gwp_asan/scripts/symbolize.sh

   1 #!/usr/bin/env bash
   2
   3 # The lines that we're looking to symbolize look like this:
   4   #0 ./a.out(_foo+0x3e6) [0x55a52e64c696]
   5 # ... which come from the backtrace_symbols() symbolisation function used by
   6 # default in Scudo's implementation of GWP-ASan.
   7
   8 while read -r line; do
   9   # Check that this line needs symbolization.
  10   should_symbolize="$(echo $line |\
  11      grep -E '^[ ]*\#.*\(.*\+0x[0-9a-f]+\) \[0x[0-9a-f]+\]$')"
  12
  13   if [ -z "$should_symbolize" ]; then
  14     echo "$line"
  15     continue
  16   fi
  17
  18   # Carve up the input line into sections.
  19   binary_name="$(echo $line | grep -oE ' .*\(' | rev | cut -c2- | rev |\
  20       cut -c2-)"
  21   function_name="$(echo $line | grep -oE '\([^+]*' | cut -c2-)"
  22   function_offset="$(echo $line | grep -oE '\(.*\)' | grep -oE '\+.*\)' |\
  23       cut -c2- | rev | cut -c2- | rev)"
  24   frame_number="$(echo $line | grep -oE '\#[0-9]+ ')"
  25
  26   if [ -z "$function_name" ]; then
  27     # If the offset is binary-relative, just resolve that.
  28     symbolized="$(echo $function_offset | addr2line -ie $binary_name)"
  29   else
  30     # Otherwise, the offset is function-relative. Get the address of the
  31     # function, and add it to the offset, then symbolize.
  32     function_addr="0x$(echo $function_offset |\
  33        nm --defined-only $binary_name 2> /dev/null |\
  34        grep -E " $function_name$" | cut -d' ' -f1)"
  35
  36     # Check that we could get the function address from nm.
  37     if [ -z "$function_addr" ]; then
  38       echo "$line"
  39       continue
  40     fi
  41
  42     # Add the function address and offset to get the offset into the binary.
  43     binary_offset="$(printf "0x%X" "$((function_addr+function_offset))")"
  44     symbolized="$(echo $binary_offset | addr2line -ie $binary_name)"
  45   fi
  46
  47   # Check that it symbolized properly. If it didn't, output the old line.
  48   echo $symbolized | grep -E ".*\?.*:" > /dev/null
  49   if [ "$?" -eq "0" ]; then
  50     echo "$line"
  51     continue
  52   else
  53     echo "${frame_number}${symbolized}"
  54   fi
  55 done 2> >(grep -v "addr2line: DWARF error: could not find variable specification")