Option to output lcov.info format?

Issue #587 new
Matthew Crenshaw
created an issue

So that we can use coverage.py with IDE plugins that read the standard lcov.info format and highlight covered/uncovered lines. Would be super great!

Comments (5)

  1. Matthew Crenshaw reporter

    lcov format

       Following  is  a  quick  description of the tracefile format as used by
       genhtml, geninfo and lcov.
       A tracefile is made up of several human-readable lines of text, divided
       into sections. If available, a tracefile begins with the testname which
       is stored in the following format:
         TN:<test name>
       For each source file referenced in the .da file,  there  is  a  section
       containing filename and coverage data:
         SF:<absolute path to the source file>
       Following is a list of line numbers for each function name found in the
       source file:
         FN:<line number of function start>,<function name>
       Next, there is a list of execution counts for each  instrumented  func‐
         FNDA:<execution count>,<function name>
       This  list  is followed by two lines containing the number of functions
       found and hit:
         FNF:<number of functions found>
         FNH:<number of function hit>
       Branch coverage information is stored which one line per branch:
         BRDA:<line number>,<block number>,<branch number>,<taken>
       Block number and branch number are gcc internal  IDs  for  the  branch.
       Taken  is either '-' if the basic block containing the branch was never
       executed or a number indicating how often that branch was taken.
       Branch coverage summaries are stored in two lines:
         BRF:<number of branches found>
         BRH:<number of branches hit>
       Then there is a list of execution counts  for  each  instrumented  line
       (i.e. a line which resulted in executable code):
         DA:<line number>,<execution count>[,<checksum>]
       Note  that  there  may be an optional checksum present for each instru‐
       mented line. The current geninfo implementation uses  an  MD5  hash  as
       checksumming algorithm.
       At  the  end of a section, there is a summary about how many lines were
       found and how many were actually instrumented:
         LH:<number of lines with a non-zero execution count>
         LF:<number of instrumented lines>
       Each sections ends with:
       In addition to the main source code file there  are  sections  for  all
       #included files which also contain executable code.
       Note that the absolute path of a source file is generated by interpret‐
       ing the contents of the respective .bb file  (see  gcov  (1)  for  more
       information  on  this  file type). Relative filenames are prefixed with
       the directory in which the .bb file is found.
       Note also that symbolic links to the .bb file will be resolved so  that
       the  actual  file  path  is  used  instead  of the path to a link. This
       approach is necessary for the mechanism to  work  with  the  /proc/gcov
  2. Ned Batchelder repo owner

    I'm a bit nervous about the language semantics assumed by this file format (list of functions found?), but that seems to be par for the course for any of these formats.

  3. Ned Batchelder repo owner

    I am not working on this at the moment, and probably will not be implementing this any time soon. There's no reason this has to be built-in to coverage.py. You can get data from coverage in XML format, or using the data API, and create a file like this with separate code.

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