1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <getopt.h>
18#include <stdio.h>
19#include <stdlib.h>
20#include <string.h>
21#include <unistd.h>
22
23#include <string>
24
25#include <demangle.h>
26
27extern "C" char* __cxa_demangle(const char*, char*, size_t*, int*);
28
29void usage(const char* prog_name) {
30  printf("Usage: %s [-c] <NAME_TO_DEMANGLE>\n", prog_name);
31  printf("  -c\n");
32  printf("    Compare the results of __cxa_demangle against the current\n");
33  printf("    demangler.\n");
34}
35
36std::string DemangleWithCxa(const char* name) {
37  const char* cxa_demangle = __cxa_demangle(name, nullptr, nullptr, nullptr);
38
39  if (cxa_demangle == nullptr) {
40    return name;
41  }
42
43  // The format of our demangler is slightly different from the cxa demangler
44  // so modify the cxa demangler output. Specifically, for templates, remove
45  // the spaces between '>' and '>'.
46  std::string demangled_str;
47  for (size_t i = 0; i < strlen(cxa_demangle); i++) {
48    if (i > 2 && cxa_demangle[i] == '>' && std::isspace(cxa_demangle[i - 1]) &&
49        cxa_demangle[i - 2] == '>') {
50      demangled_str.resize(demangled_str.size() - 1);
51    }
52    demangled_str += cxa_demangle[i];
53  }
54  return demangled_str;
55}
56
57int main(int argc, char** argv) {
58#ifdef __BIONIC__
59  const char* prog_name = getprogname();
60#else
61  const char* prog_name = argv[0];
62#endif
63
64  bool compare = false;
65  int opt_char;
66  while ((opt_char = getopt(argc, argv, "c")) != -1) {
67    if (opt_char == 'c') {
68      compare = true;
69    } else {
70      usage(prog_name);
71      return 1;
72    }
73  }
74  if (optind >= argc || argc - optind != 1) {
75    printf("Must supply a single argument.\n\n");
76    usage(prog_name);
77    return 1;
78  }
79  const char* name = argv[optind];
80
81  std::string demangled_name = demangle(name);
82
83  printf("%s\n", demangled_name.c_str());
84
85  if (compare) {
86    std::string cxa_demangle_str(DemangleWithCxa(name));
87
88    if (cxa_demangle_str != demangled_name) {
89      printf("Mismatch\n");
90      printf("cxa demangle: %s\n", cxa_demangle_str.c_str());
91      return 1;
92    } else {
93      printf("Match\n");
94    }
95  }
96  return 0;
97}
98