The Tor Browser: tools/reorder/histogram.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 /*

     7   A program that computes a call histogram from runtime call

     8   information. It reads a list of address references (e.g., as

     9   computed by libcygprof.so), and uses an ELF image to map the

    10   addresses to functions.

    12  */

    14 #include <fstream>

    15 #include <hash_map>

    16 #include <limits.h>

    17 #include <unistd.h>

    18 #include <stdio.h>

    19 #include <fcntl.h>

    21 #include "elf_symbol_table.h"

    23 #define _GNU_SOURCE

    24 #include <getopt.h>

    26 const char *opt_exe;

    27 int opt_tick = 0;

    29 elf_symbol_table table;

    31 typedef hash_map<unsigned int, unsigned int> histogram_t;

    32 histogram_t histogram;

    34 static struct option long_options[] = {

    35     { "exe",  required_argument, 0, 'e' },

    36     { "tick", optional_argument, 0, 't' },

    37     { 0,      0,                 0, 0   }

    38 };

    40 static void

    41 usage(const char *name)

    42 {

    43     cerr << "usage: " << name << " --exe=<image> [--tick[=count]]" << endl;

    44 }

    46 static void

    47 map_addrs(int fd)

    48 {

    49     // Read the binary addresses from stdin.

    50     unsigned int buf[128];

    51     ssize_t cb;

    53     unsigned int count = 0;

    54     while ((cb = read(fd, buf, sizeof buf)) > 0) {

    55         if (cb % sizeof buf[0])

    56             fprintf(stderr, "unaligned read\n");

    58         unsigned int *addr = buf;

    59         unsigned int *limit = buf + (cb / 4);

    61         for (; addr < limit; ++addr) {

    62             const Elf32_Sym *sym = table.lookup(*addr);

    63             if (sym)

    64                 ++histogram[reinterpret_cast<unsigned int>(sym)];

    66             if (opt_tick && (++count % opt_tick == 0)) {

    67                 cerr << ".";

    68                 flush(cerr);

    69             }

    70         }

    71     }

    73     if (opt_tick)

    74         cerr << endl;

    75 }

    77 int

    78 main(int argc, char *argv[])

    79 {

    80     int c;

    81     while (1) {

    82         int option_index = 0;

    83         c = getopt_long(argc, argv, "e:t", long_options, &option_index);

    85         if (c < 0)

    86             break;

    88         switch (c) {

    89         case 'e':

    90             opt_exe = optarg;

    91             break;

    93         case 't':

    94             opt_tick = optarg ? atoi(optarg) : 1000000;

    95             break;

    97         default:

    98             usage(argv[0]);

    99             return 1;

   100         }

   101     }

   103     if (! opt_exe) {

   104         usage(argv[0]);

   105         return 1;

   106     }

   108     table.init(opt_exe);

   110     // Process addresses.

   111     if (optind >= argc) {

   112         map_addrs(STDIN_FILENO);

   113     }

   114     else {

   115         do {

   116             int fd = open(argv[optind], O_RDONLY);

   117             if (fd < 0) {

   118                 perror(argv[optind]);

   119                 return 1;

   120             }

   122             map_addrs(fd);

   123             close(fd);

   124         } while (++optind < argc);

   125     }

   127     // Emit the histogram.

   128     histogram_t::const_iterator limit = histogram.end();

   129     histogram_t::const_iterator i;

   130     for (i = histogram.begin(); i != limit; ++i) {

   131         const Elf32_Sym *sym = reinterpret_cast<const Elf32_Sym *>(i->first);

   132         cout.form("%08x %6d %2d %10d ",

   133                   sym->st_value,

   134                   sym->st_size,

   135                   sym->st_shndx,

   136                   i->second);

   138         cout << table.get_symbol_name(sym) << endl;

   139     }

   141     return 0;

   142 }

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