source/tracer.cpp

   1 #include <stdexcept>
   2 #include "gldbg.h"
   3 #include "glprint.h"
   4 #include "tracer.h"
   5
   6 using namespace std;
   7
   8 Tracer::Tracer(GlDbg &dbg):
   9         glprint(new GlPrint(0, 16384)),
  10         out(0),
  11         close_out(true),
  12         enabled(true)
  13 {
  14         dbg.get_command_interpreter().register_command("trace", this, &Tracer::cmd_trace)
  15                 .set_help("Traces GL function calls",
  16                         "trace\n"
  17                         "  Send trace output to stdout.\n\n"
  18                         "trace FILE\n"
  19                         "  Send trace output to FILE (- for stdout).\n\n"
  20                         "trace {off|on}\n"
  21                         "  Temporarily suspend or resume trace without closing the file.\n\n"
  22                         "trace end\n"
  23                         "  Terminate trace, closing the file.\n");
  24 }
  25
  26 Tracer::~Tracer()
  27 {
  28         delete glprint;
  29         if(close_out && out)
  30                 fclose(out);
  31 }
  32
  33 void Tracer::set_output(FILE *o, bool d)
  34 {
  35         if(close_out && out)
  36                 fclose(out);
  37         out = o;
  38         close_out = d;
  39 }
  40
  41 void Tracer::decode(const char *data, unsigned len)
  42 {
  43         if(!enabled || !out)
  44                 return;
  45
  46         int ret = glprint->decode(data, len);
  47         if(ret>=0)
  48         {
  49                 const char *buf = glprint->get_buffer();
  50                 if(buf[0])
  51                         fprintf(out, "%s\n", buf);
  52         }
  53 }
  54
  55 void Tracer::cmd_trace(const string &args)
  56 {
  57         if(args.empty() || args=="-")
  58         {
  59                 set_output(stdout, false);
  60                 printf("Tracing to stdout\n");
  61         }
  62         else if(args=="on")
  63         {
  64                 if(!out)
  65                         throw runtime_error("Output is not set");
  66                 enabled = true;
  67                 printf("Tracing enabled\n");
  68         }
  69         else if(args=="off")
  70         {
  71                 enabled = false;
  72                 printf("Tracing disabled\n");
  73         }
  74         else if(args=="end")
  75         {
  76                 set_output(0, true);
  77                 printf("Tracing terminated\n");
  78         }
  79         else
  80         {
  81                 FILE *f = fopen(args.c_str(), "w");
  82                 if(!f)
  83                         throw runtime_error("Could not open trace file");
  84
  85                 set_output(f, true);
  86                 printf("Tracing to %s\n", args.c_str());
  87         }
  88 }