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Code coverage using the debug lib

 
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JarrettBillingsley



Joined: 20 Jun 2006
Posts: 457
Location: Pennsylvania!

PostPosted: Fri Jul 10, 2009 1:32 pm    Post subject: Code coverage using the debug lib Reply with quote

Sorry, this was just too cool to not post (you'll have to have updated to the newest revision, 561, for it to work right, since I fixed a bug with ?=):

Code:
{
   // {moduleName = {funcName = {line = int}}}
   local coverTab = {}

   function cover(type)
   {
      assert(type == "line")

      local name = debug.sourceName(1)
      local func = debug.getFunc(1)
      local line = debug.currentLine(1)

      coverTab[name] ?= {}
      coverTab[name][func] ?= {[l] = 0 for l in debug.lineInfo(1)}
      coverTab[name][func][line]++
   }

   function dumpCoverInfo()
   {
      foreach(sourceFile, funcs; coverTab)
      {
         if(io.exists(sourceFile))
         {
            writeln(sourceFile)
            writeln("-".repeat(#sourceFile))
            writeln()

            local tmp = {}

            foreach(func, lines; funcs)
            {
               foreach(line, count; lines)
               {
                  tmp[line] ?= 0
                  tmp[line] += count
               }
            }

            foreach(i, line; io.lines(sourceFile))
            {
               if(i in tmp)
               {
                  local count = tmp[i]
                  
                  if(count == 0)
                     writefln("000000    |{}", line)
                  else
                     writefln("{,-10}| {}", count, line)
               }
               else
                  writefln("          | {}", line)
            }
         }
         else
            writeln("Cannot find source for file ", sourceFile)

         writeln();
      }
   }
}

debug.setHook$ cover, "l"

scope(exit)
{
   debug.setHook$ null
   dumpCoverInfo()
}


Bam, suddenly you have code coverage analysis that's dumped to the console when your program exits. The output is similar to DMD's -cov output.
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