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
27 extern "C" char* __cxa_demangle(const char*, char*, size_t*, int*);
28
usage(const char * prog_name)29 void 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
DemangleWithCxa(const char * name)36 std::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
main(int argc,char ** argv)57 int 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