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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <cctype>
#include <string>
#include <demangle.h>
extern "C" char* __cxa_demangle(const char*, char*, size_t*, int*);
static void Usage(const char* prog_name) {
printf("usage: %s [-c] [NAME_TO_DEMANGLE...]\n", prog_name);
printf("\n");
printf("Demangles C++ mangled names if supplied on the command-line, or found\n");
printf("reading from stdin otherwise.\n");
printf("\n");
printf("-c\tCompare against __cxa_demangle\n");
printf("\n");
}
static std::string DemangleWithCxa(const char* name) {
const char* cxa_demangle = __cxa_demangle(name, nullptr, nullptr, nullptr);
if (cxa_demangle == nullptr) {
return name;
}
// The format of our demangler is slightly different from the cxa demangler
// so modify the cxa demangler output. Specifically, for templates, remove
// the spaces between '>' and '>'.
std::string demangled_str;
for (size_t i = 0; i < strlen(cxa_demangle); i++) {
if (i > 2 && cxa_demangle[i] == '>' && std::isspace(cxa_demangle[i - 1]) &&
cxa_demangle[i - 2] == '>') {
demangled_str.resize(demangled_str.size() - 1);
}
demangled_str += cxa_demangle[i];
}
return demangled_str;
}
static void Compare(const char* name, const std::string& demangled_name) {
std::string cxa_demangled_name(DemangleWithCxa(name));
if (cxa_demangled_name != demangled_name) {
printf("\nMismatch!\n");
printf("\tmangled name: %s\n", name);
printf("\tour demangle: %s\n", demangled_name.c_str());
printf("\tcxa demangle: %s\n", cxa_demangled_name.c_str());
exit(1);
}
}
static int Filter(bool compare) {
char* line = nullptr;
size_t line_length = 0;
while ((getline(&line, &line_length, stdin)) != -1) {
char* p = line;
char* name;
while ((name = strstr(p, "_Z")) != nullptr) {
// Output anything before the identifier.
*name = 0;
printf("%s", p);
*name = '_';
// Extract the identifier.
p = name;
while (*p && (std::isalnum(*p) || *p == '_' || *p == '.' || *p == '$')) ++p;
// Demangle and output.
std::string identifier(name, p);
std::string demangled_name = demangle(identifier.c_str());
printf("%s", demangled_name.c_str());
if (compare) Compare(identifier.c_str(), demangled_name);
}
// Output anything after the last identifier.
printf("%s", p);
}
free(line);
return 0;
}
int main(int argc, char** argv) {
#ifdef __BIONIC__
const char* prog_name = getprogname();
#else
const char* prog_name = argv[0];
#endif
bool compare = false;
int opt_char;
while ((opt_char = getopt(argc, argv, "c")) != -1) {
if (opt_char == 'c') {
compare = true;
} else {
Usage(prog_name);
return 1;
}
}
// With no arguments, act as a filter.
if (optind == argc) return Filter(compare);
// Otherwise demangle each argument.
while (optind < argc) {
const char* name = argv[optind++];
std::string demangled_name = demangle(name);
printf("%s\n", demangled_name.c_str());
if (compare) Compare(name, demangled_name);
}
return 0;
}
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