C++ Library containing a lot of needful things: Stack Trace, Command Line Parser, Resource Handling, Configuration Files, Unix Command Execution, Directories, Regular Expressions, Tokenizer, Function Trace, Standard Extensions.
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/** @file
$Id$
$Date$
$Author$
@copy © Marc Wäckerlin
@license LGPL, see file <a href="license.html">COPYING</a>
$Log$
Revision 1.6 2004/10/11 15:58:51 marc
First version with working support for shared libraries!
Revision 1.5 2004/10/07 16:59:12 marc
new method createSymtable that takes a list of arguments
-> untested!
Revision 1.4 2004/10/07 09:32:45 marc
correction in parameter (const&)
Revision 1.3 2004/08/28 16:21:25 marc
mrw-c++-0.92 (mrw)
- new file: version.cpp
- new file header for all sources
- work around warning in mrw::auto<T>
- possibility to compile without log4cxx
- work around bugs in demangle.h and libiberty.h
- corrections in documentation
- added simple tracing mechanism
- more warnings
- small corrections in Auto<>::Free and a new test for it
- possibility to compile without stack trace
*/
#include <mrw/stacktrace.hpp>
#include <mrw/exec.hpp>
#include <mrw/string.hpp>
#include <mrw/list.hpp>
#include <mrw/stdext.hpp>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <assert.h>
#include <math.h>
#include <algorithm>
#include <list>
#if defined(__solaris__)
#include <sys/old_procfs.h>
#endif
#if defined (__GLIBC__)
#include <execinfo.h>
#endif
#include <bfd.h>
extern "C" {
/// @bug redefined in libiberty.h
# define HAVE_DECL_BASENAME 1
/// @bug redefined in libiberty.h
# define HAVE_DECL_ASPRINTF 1
/// @bug redefined in libiberty.h
# define HAVE_DECL_VASPRINTF 1
/** @bug
- in file file: /usr/include/demangle.h
- of package: binutils-2.15.90.0.1.1-31
An idiot unfortunately abused the C++ keyword @c typename as
variable name to @c cplus_demangle_fill_builtin_type, so I have
to work around it.
*/
# define typename anotherNameThatsNotAKeyword
# include <demangle.h>
# undef typename
// // copied from demangle.h because of compiler warnings in libliberty.h
// // (... throws different exception)
// #define DMGL_PARAMS (1 << 0) /* Include function args */
// #define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */
// /// @bug demangle.h includes libiberty.h which throws different
// /// exceptions for the same functions than other standard libraries,
// /// so I can't include demangle.h!
// extern char * cplus_demangle(const char *, int);
}
#include <iomanip>
namespace mrw {
//----------------------------------------------------------------------------
static std::string demangle(bfd* abfd, const char* name) {
if (bfd_get_symbol_leading_char(abfd) == name[0]) ++name;
/* This is a hack for better error reporting on XCOFF, PowerPC64-ELF
or the MS PE format. These formats have a number of leading '.'s
on at least some symbols, so we remove all dots to avoid
confusing the demangler. */
const char* p(name);
while (p && *p == '.') ++p;
Auto<char*>::Free res(cplus_demangle(p, DMGL_ANSI | DMGL_PARAMS));
if (res) {
/* Now put back any stripped dots. */
if (p==name) return static_cast<const char*>(res);
std::string add_dots('.', p-name);
return add_dots+=static_cast<const char*>(res);
}
return name;
}
}
//----------------------------------------------------------------------------
mrw::StackTrace::StackTrace() throw(std::bad_exception) {
// maximum trace level is limited here to 50, see below why
# if defined(__GLIBC__)
{
const int TRACE_LEVEL(50);
void* ba[TRACE_LEVEL];
for (int n(backtrace(ba, TRACE_LEVEL)), i(0); i<n; ++i)
_trace.push_back(ba[i]);
}
# elif defined(__GNUG__)
{
# define push(i) \
(__builtin_return_address(i) ? \
(_trace.push_back(__builtin_return_address(i)), true) : false)
push(0) && push(1) && push(2) && push(3) && push(4) && push(5) &&
push(6) && push(7) && push(8) && push(9) && push(10) && push(11) &&
push(12) && push(13) && push(14) && push(15) && push(16) && push(17)
&& push(18) && push(19) && push(20) && push(21) && push(22) &&
push(23) && push(24) && push(25) && push(26) && push(27) && push(28)
&& push(29) && push(30) && push(31) && push(32) && push(33) &&
push(34) && push(35) && push(36) && push(37) && push(38) && push(39)
&& push(40) && push(41) && push(42) && push(43) && push(44) &&
push(45) && push(46) && push(47) && push(48) && push(49);
# undef push
}
# else
# warning "You need GNU gcc or GNU glibc to be able to use mrw::StackTrace"
# endif
}
//----------------------------------------------------------------------------
mrw::StackTrace::operator std::string() const throw(std::bad_exception) {
static const double LN10(log(10));
std::string s;
s<<1;
bool first(true);
unsigned int lisz(0), fisz(0);
std::list<CodePos> l;
for (AddressTrace::const_reverse_iterator it(_trace.rbegin());
it!=_trace.rend(); ++it, first=false) {
CodePos c(translate(*it));
if (log(c.line+1)/LN10 > lisz) lisz = (unsigned int)(log(c.line+1)/LN10);
if (c.file.size() > fisz) fisz = c.file.size();
l.push_back(c);
}
for (std::list<CodePos>::iterator it(l.begin()); it!=l.end(); ++it)
s<<"["<<it->address<<"] "
<<it->file<<':'<<it->line
<<std::setw(fisz+lisz-it->file.size()-
(unsigned int)(log(it->line+1)/LN10)-1)
<<" "<<it->function<<"\n";
return s;
}
//----------------------------------------------------------------------------
const mrw::StackTrace& mrw::StackTrace::print(std::ostream& os) const
throw(std::bad_exception) {
os<<(std::string)*this;
return *this;
}
//----------------------------------------------------------------------------
mrw::StackTrace::CodePos mrw::StackTrace::translate(void* addr)
throw(std::bad_exception) {
assert(sizeof(bfd_vma)>=sizeof(void*));
bfd_vma vma_addr(reinterpret_cast<bfd_vma>(addr));
std::map<Translator::key_type, std::string>::iterator
it(_addrs.lower_bound(vma_addr));
if (it==_addrs.begin() || (--it)->first > vma_addr ||
_dic.find(it->second)==_dic.end() ||
_dic[it->second][it->first].first <= vma_addr)
return CodePos(addr, "????", "????", 0);
static const char* file(0);
static const char* function(0);
unsigned int line;
if (!bfd_find_nearest_line
(const_cast<bfd*>(static_cast<const bfd*>(_bfd[it->second])),
_dic[it->second][it->first].second,
_syms[it->second],
vma_addr - it->first,
&file, &function, &line))
return CodePos(addr, "????", "????", 0);
return CodePos(addr, mrw::demangle(_bfd[it->second], function),
file?file:"????", line);
}
//----------------------------------------------------------------------------
bool mrw::StackTrace::createSymtable(const std::string& fname, void* offs)
throw(std::bad_exception) {
if (_dic.find(fname)!=_dic.end()) return true; // already loaded
if (fname=="") return createSymtable(filename());
AutoBfd abfd(bfd_openr(fname.c_str(), 0));
long memsz(-1);
Auto<char**>::Free m(0);
if (!abfd || bfd_check_format(abfd, bfd_archive) ||
!bfd_check_format_matches(abfd, bfd_object, &(m.getClean())) ||
!(bfd_get_file_flags(const_cast<bfd*>(static_cast<const bfd*>(abfd)))
&HAS_SYMS) ||
(memsz=bfd_get_symtab_upper_bound
(const_cast<bfd*>(static_cast<const bfd*>(abfd))))<0)
return false;
mrw::AutoPtr<asymbol*> syms(new asymbol*[memsz]);
if (bfd_canonicalize_symtab(const_cast<bfd*>(static_cast<const bfd*>(abfd)),
syms)<0)
return false;
_bfd[fname] = abfd;
_syms[fname] = syms;
_dic[fname];
std::pair<std::string, void*> fileoffs = std::make_pair(fname, offs);
bfd_map_over_sections(_bfd[fname], buildSectionMap, &fileoffs);
return true;
}
//----------------------------------------------------------------------------
bool mrw::StackTrace::createSymtable(const mrw::StackTrace::BinFiles& files)
throw(std::bad_exception) {
bool success(true);
for (BinFiles::const_iterator it(files.begin());
it!=files.end(); ++it) {
if (!createSymtable(it->first, it->second)) success=false;
}
return success;
}
//----------------------------------------------------------------------------
mrw::StackTrace::BinFiles mrw::StackTrace::filename()
throw(std::bad_exception) {
mrw::StackTrace::BinFiles res;
std::string s;
s<<"/proc/"<<getpid();
# if defined(__solaris__)
{
AutoFile fd(open(s.str(), O_RDONLY));
prpsinfo_t status;
if (fd==-1 || ioctl(fd, PIOCPSINFO, &status)==-1) return res;
s = status.pr_psargs;
return res<<BinFiles::value_type(s.substr(0, s.find(' ')), 0);
}
# elif defined(__linux__)
{
res<<BinFiles::value_type(s<<"/exe", 0);
try {
mrw::Exec ldd = (mrw::Cmd("/usr/bin/ldd"), s).execute();
for (std::string lddres(ldd.result());
lddres.size();
lddres.erase(0, min(lddres.find('\n')+1, std::string::npos))) {
std::string line(lddres.substr(0, lddres.find('\n')));
std::string::size_type pos = line.find(" => ");
if (pos<std::string::npos) {
pos += 4;
std::string file = line.substr(pos, (pos=line.find(' ', pos)-pos));
std::stringstream addr;
addr<<line.substr(++(pos=line.find('(', pos)),
line.find(')', pos)-pos);
void* address(0);
addr>>address;
if (file.size()) res<<BinFiles::value_type(file, address);
}
}
} catch (mrw::ExecutionFailedExc&) {}
return res;
}
# else
{
# warning "Don't know how to get executable file name in your system!"
# warning "Impossible to get function names in stack trace!"
# warning "Give the path to the executable to StackTrace::createSymtable!"
abort();
}
# endif
}
//----------------------------------------------------------------------------
void mrw::StackTrace::buildSectionMap(bfd* abfd, asection* section,
void* fileoffs)
throw(std::bad_exception) {
if (!abfd || !section || !fileoffs) return;
if (!(bfd_get_section_flags(abfd, section)&SEC_ALLOC)) return;
std::pair<std::string, void*> fileoffset =
*(std::pair<std::string, void*>*)fileoffs;
bfd_vma vma(bfd_get_section_vma(abfd, section)+
reinterpret_cast<bfd_vma>(fileoffset.second));
bfd_size_type sz(bfd_get_section_size_before_reloc(section));
_dic[fileoffset.first][vma] = Translator::mapped_type(vma+sz, section);
_addrs[vma] = fileoffset.first;
}
//----------------------------------------------------------------------------
std::map<std::string, mrw::StackTrace::Translator> mrw::StackTrace::_dic;
std::map<mrw::StackTrace::Translator::key_type, std::string>
mrw::StackTrace::_addrs;
std::map<std::string, mrw::AutoBfd> mrw::StackTrace::_bfd;
std::map<std::string, mrw::AutoPtr<asymbol*> > mrw::StackTrace::_syms;