ppapi/tools/pepper_hash_for_uma.cc

   1 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // This is a utility executable used for generating hashes for pepper
   6 // interfaces for inclusion in tools/metrics/histograms/histograms.xml. Every
   7 // interface-version pair must have a corresponding entry in the enum there.
   8 //
   9 // The hashing logic here must match the hashing logic at
  10 // ppapi/proxy/interface_list.cc.
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15
  16 #include "base/hash.h"
  17 #include "base/macros.h"
  18
  19 int main(int argc, char **argv) {
  20   if (argc < 2) {
  21     fprintf(stderr, "Usage: %s <interface1> <interface2> <...>\n", argv[0]);
  22     fprintf(stderr, "\n");
  23     fprintf(stderr, "Prints hashes for interface names.\n");
  24     fprintf(stderr, "Example: %s \"PPB_Var;1.1\" \"PPB_FileIO;1.2\"\n",
  25             argv[0]);
  26     return 1;
  27   }
  28   for (int i = 1; i < argc; i++) {
  29     uint32 data = base::Hash(argv[i], strlen(argv[i]));
  30
  31     // Strip off the signed bit because UMA doesn't support negative values,
  32     // but takes a signed int as input.
  33     int hash = static_cast<int>(data & 0x7fffffff);
  34     printf("<int value=\"%d\" label=\"%s\"/>\n", hash, argv[i]);
  35   }
  36   return 0;
  37 }