mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
143 lines
3.1 KiB
C++
143 lines
3.1 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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A program that computes a call histogram from runtime call
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information. It reads a list of address references (e.g., as
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computed by libcygprof.so), and uses an ELF image to map the
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addresses to functions.
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*/
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#include <fstream>
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#include <hash_map>
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#include <limits.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include "elf_symbol_table.h"
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#define _GNU_SOURCE
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#include <getopt.h>
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const char *opt_exe;
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int opt_tick = 0;
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elf_symbol_table table;
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typedef hash_map<unsigned int, unsigned int> histogram_t;
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histogram_t histogram;
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static struct option long_options[] = {
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{ "exe", required_argument, 0, 'e' },
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{ "tick", optional_argument, 0, 't' },
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{ 0, 0, 0, 0 }
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};
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static void
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usage(const char *name)
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{
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cerr << "usage: " << name << " --exe=<image> [--tick[=count]]" << endl;
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}
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static void
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map_addrs(int fd)
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{
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// Read the binary addresses from stdin.
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unsigned int buf[128];
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ssize_t cb;
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unsigned int count = 0;
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while ((cb = read(fd, buf, sizeof buf)) > 0) {
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if (cb % sizeof buf[0])
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fprintf(stderr, "unaligned read\n");
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unsigned int *addr = buf;
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unsigned int *limit = buf + (cb / 4);
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for (; addr < limit; ++addr) {
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const Elf32_Sym *sym = table.lookup(*addr);
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if (sym)
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++histogram[reinterpret_cast<unsigned int>(sym)];
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if (opt_tick && (++count % opt_tick == 0)) {
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cerr << ".";
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flush(cerr);
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}
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}
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}
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if (opt_tick)
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cerr << endl;
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}
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int
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main(int argc, char *argv[])
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{
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int c;
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while (1) {
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int option_index = 0;
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c = getopt_long(argc, argv, "e:t", long_options, &option_index);
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if (c < 0)
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break;
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switch (c) {
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case 'e':
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opt_exe = optarg;
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break;
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case 't':
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opt_tick = optarg ? atoi(optarg) : 1000000;
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break;
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default:
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usage(argv[0]);
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return 1;
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}
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}
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if (! opt_exe) {
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usage(argv[0]);
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return 1;
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}
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table.init(opt_exe);
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// Process addresses.
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if (optind >= argc) {
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map_addrs(STDIN_FILENO);
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}
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else {
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do {
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int fd = open(argv[optind], O_RDONLY);
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if (fd < 0) {
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perror(argv[optind]);
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return 1;
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}
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map_addrs(fd);
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close(fd);
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} while (++optind < argc);
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}
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// Emit the histogram.
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histogram_t::const_iterator limit = histogram.end();
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histogram_t::const_iterator i;
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for (i = histogram.begin(); i != limit; ++i) {
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const Elf32_Sym *sym = reinterpret_cast<const Elf32_Sym *>(i->first);
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cout.form("%08x %6d %2d %10d ",
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sym->st_value,
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sym->st_size,
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sym->st_shndx,
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i->second);
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cout << table.get_symbol_name(sym) << endl;
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}
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return 0;
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}
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