[gwp_asan] Improve symbolizer script

[vitalybuka]

Summary

Show inlined functions.
Hide unhelpful DWARF related warnings.

[hctim]

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

55

can we filter out specific bad warnings, rather than clobber all of stderr?

[vitalybuka]

filter specific warning

[hctim]

LGTM

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

binary_name="$(echo $line | grep -oE ' .*\(' | rev | cut -c2- | rev |\
       cut -c2-)"
   function_name="$(echo $line | grep -oE '\([^+]*' | cut -c2-)"
   function_offset="$(echo $line | grep -oE '\(.*\)' | grep -oE '\+.*\)' |\
       cut -c2- | rev | cut -c2- | rev)"
   frame_number="$(echo $line | grep -oE '\#[0-9]+ ')"
 
   if [ -z "$function_name" ]; then
     # If the offset is binary-relative, just resolve that.
-    symbolized="$(echo $function_offset | addr2line -e $binary_name)"
+    symbolized="$(echo $function_offset | addr2line -ie $binary_name)"
   else
     # Otherwise, the offset is function-relative. Get the address of the
     # function, and add it to the offset, then symbolize.
     function_addr="0x$(echo $function_offset |\
        nm --defined-only $binary_name 2> /dev/null |\
        grep -E " $function_name$" | cut -d' ' -f1)"
 
     # Check that we could get the function address from nm.
     if [ -z "$function_addr" ]; then
       echo "$line"
       continue
     fi
 
     # Add the function address and offset to get the offset into the binary.
     binary_offset="$(printf "0x%X" "$((function_addr+function_offset))")"
-    symbolized="$(echo $binary_offset | addr2line -e $binary_name)"
+    symbolized="$(echo $binary_offset | addr2line -ie $binary_name)"
   fi
 
   # Check that it symbolized properly. If it didn't, output the old line.
   echo $symbolized | grep -E ".*\?.*:" > /dev/null
   if [ "$?" -eq "0" ]; then
     echo "$line"
     continue
   else
     echo "${frame_number}${symbolized}"
   fi
-done
+done 2> >(grep -v "addr2line: DWARF error: could not find variable specification")