llvm-locstats - calculate statistics on DWARF debug location

SYNOPSIS

llvm-locstats [options] [filename]

DESCRIPTION

llvm-locstats works like a wrapper around llvm-dwarfdump. It parses llvm-dwarfdump statistics regarding debug location by pretty printing it in a more human readable way.

The line 0% shows the number and the percentage of DIEs with no location information, but the line 100% shows the information for DIEs where there is location information in all code section bytes (where the variable or parameter is in the scope). The line [50%,60%) shows the number and the percentage of DIEs where the location information is between 50 and 60 percentage of its scope covered.

OPTIONS

--only-variables

calculate the location statistics only for local variables

--only-formal-parameters

calculate the location statistics only for formal parameters

--ignore-debug-entry-values

ignore the location statistics on locations containing the debug entry values DWARF operation

--draw-plot

make histogram of location buckets generated (requires matplotlib)

--compare

compare the debug location coverage on two files provided, and draw a plot showing the difference (requires matplotlib)

EXIT STATUS

llvm-locstats returns 0 if the input file were parsed successfully. Otherwise, it returns 1.

EXAMPLE 1

Pretty print the location coverage on the standard output.

llvm-locstats a.out

  =================================================
            Debug Location Statistics
  =================================================
        cov%          samples       percentage(~)
  -------------------------------------------------
     0%                    1              16%
     (0%,10%)              0               0%
     [10%,20%)             0               0%
     [20%,30%)             0               0%
     [30%,40%)             0               0%
     [40%,50%)             0               0%
     [50%,60%)             1              16%
     [60%,70%)             0               0%
     [70%,80%)             0               0%
     [80%,90%)             1              16%
     [90%,100%)            0               0%
     100%                  3              50%
  =================================================
  -the number of debug variables processed: 6
  -PC ranges covered: 81%
  -------------------------------------------------
  -total availability: 83%
  =================================================

EXAMPLE 2

Generate a plot as an image file.

llvm-locstats --draw-plot file1.out

EXAMPLE 3

Generate a plot as an image file showing the difference in the debug location coverage.

llvm-locstats --compare file1.out file1.withentryvals.out

SEE ALSO

llvm-dwarfdump(1)