src/unix/stackwalk.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/stackwalk.cpp
   3 // Purpose:     wxStackWalker implementation for Unix/glibc
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     2005-01-18
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2005 Vadim Zeitlin <vadim@wxwindows.org>
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #if wxUSE_STACKWALKER
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/string.h"
  30     #include "wx/app.h"
  31     #include "wx/log.h"
  32     #include "wx/utils.h"
  33 #endif
  34
  35 #include "wx/stackwalk.h"
  36
  37 #include <execinfo.h>
  38
  39 #ifdef HAVE_CXA_DEMANGLE
  40     #include <cxxabi.h>
  41 #endif // HAVE_CXA_DEMANGLE
  42
  43 // ----------------------------------------------------------------------------
  44 // tiny helper wrapper around popen/pclose()
  45 // ----------------------------------------------------------------------------
  46
  47 class wxStdioPipe
  48 {
  49 public:
  50     // ctor parameters are passed to popen()
  51     wxStdioPipe(const char *command, const char *type)
  52     {
  53         m_fp = popen(command, type);
  54     }
  55
  56     // conversion to stdio FILE
  57     operator FILE *() const { return m_fp; }
  58
  59     // dtor closes the pipe
  60     ~wxStdioPipe()
  61     {
  62         if ( m_fp )
  63             pclose(m_fp);
  64     }
  65
  66 private:
  67     FILE *m_fp;
  68
  69     DECLARE_NO_COPY_CLASS(wxStdioPipe)
  70 };
  71
  72 // ============================================================================
  73 // implementation
  74 // ============================================================================
  75
  76 wxString wxStackWalker::ms_exepath;
  77
  78 // ----------------------------------------------------------------------------
  79 // wxStackFrame
  80 // ----------------------------------------------------------------------------
  81
  82 void wxStackFrame::OnGetName()
  83 {
  84     if ( m_hasName )
  85         return;
  86
  87     m_hasName = true;
  88
  89     // try addr2line first because it always gives us demangled names (even if
  90     // __cxa_demangle is not available) and because it seems less error-prone
  91     // when it works, backtrace_symbols() sometimes returns incorrect results
  92     OnGetLocation();
  93
  94     // format is: "module(funcname+offset) [address]" but the part in
  95     // parentheses can be not present
  96     wxString syminfo = wxString::FromAscii(m_syminfo);
  97     const size_t posOpen = syminfo.find(_T('('));
  98     if ( posOpen != wxString::npos )
  99     {
 100         const size_t posPlus = syminfo.find(_T('+'), posOpen + 1);
 101         if ( posPlus != wxString::npos )
 102         {
 103             const size_t posClose = syminfo.find(_T(')'), posPlus + 1);
 104             if ( posClose != wxString::npos )
 105             {
 106                 if ( m_name.empty() )
 107                 {
 108                     m_name.assign(syminfo, posOpen + 1, posPlus - posOpen - 1);
 109
 110 #ifdef HAVE_CXA_DEMANGLE
 111                     int rc = -1;
 112                     char *cppfunc = __cxxabiv1::__cxa_demangle
 113                                     (
 114                                         m_name.mb_str(),
 115                                         NULL, // output buffer (none, alloc it)
 116                                         NULL, // [out] len of output buffer
 117                                         &rc
 118                                     );
 119                     if ( rc == 0 )
 120                         m_name = wxString::FromAscii(cppfunc);
 121
 122                     free(cppfunc);
 123 #endif // HAVE_CXA_DEMANGLE
 124                 }
 125
 126                 unsigned long ofs;
 127                 if ( wxString(syminfo, posPlus + 1, posClose - posPlus - 1).
 128                         ToULong(&ofs, 0) )
 129                     m_offset = ofs;
 130             }
 131         }
 132
 133         m_module.assign(syminfo, posOpen);
 134     }
 135     else // not in "module(funcname+offset)" format
 136     {
 137         m_module = syminfo;
 138     }
 139 }
 140
 141 void wxStackFrame::OnGetLocation()
 142 {
 143     if ( m_hasLocation )
 144         return;
 145
 146     m_hasLocation = true;
 147
 148     // we need to launch addr2line tool to get this information and we need to
 149     // have the program name for this
 150     wxString exepath = wxStackWalker::GetExePath();
 151     if ( exepath.empty() )
 152     {
 153         if ( !wxTheApp || !wxTheApp->argv )
 154             return;
 155         exepath = wxTheApp->argv[0];
 156     }
 157
 158     wxStdioPipe fp(wxString::Format(_T("addr2line -C -f -e \"%s\" %p"),
 159                                     exepath.c_str(), m_address).mb_str(),
 160                    "r");
 161
 162     if ( !fp )
 163         return;
 164
 165     // parse addr2line output
 166     char buf[1024];
 167     if ( !fgets(buf, WXSIZEOF(buf), fp) )
 168     {
 169         wxLogDebug(_T("Empty addr2line output?"));
 170         return;
 171     }
 172
 173     // 1st line has function name
 174     if ( GetName().empty() )
 175     {
 176         m_name = wxString::FromAscii(buf);
 177         m_name.RemoveLast(); // trailing newline
 178
 179         if ( m_name == _T("??") )
 180             m_name.clear();
 181     }
 182
 183     // 2nd one -- the file/line info
 184     if ( fgets(buf, WXSIZEOF(buf), fp) )
 185     {
 186         wxString output(wxString::FromAscii(buf));
 187         output.RemoveLast();
 188
 189         const size_t posColon = output.find(_T(':'));
 190         if ( posColon != wxString::npos )
 191         {
 192             m_filename.assign(output, 0, posColon);
 193             if ( m_filename == _T("??") )
 194             {
 195                 m_filename.clear();
 196             }
 197             else
 198             {
 199                 unsigned long line;
 200                 if ( wxString(output, posColon + 1, wxString::npos).
 201                         ToULong(&line) )
 202                     m_line = line;
 203             }
 204         }
 205         else
 206         {
 207             wxLogDebug(_T("Unexpected addr2line format: \"%s\""),
 208                        output.c_str());
 209         }
 210     }
 211 }
 212
 213 // ----------------------------------------------------------------------------
 214 // wxStackWalker
 215 // ----------------------------------------------------------------------------
 216
 217 void wxStackWalker::Walk(size_t skip)
 218 {
 219     // that many frames should be enough for everyone
 220     void *addresses[200];
 221
 222     int depth = backtrace(addresses, WXSIZEOF(addresses));
 223     if ( !depth )
 224         return;
 225
 226     char **symbols = backtrace_symbols(addresses, depth);
 227
 228     if (skip > (size_t) depth)
 229         skip = (size_t) depth;
 230
 231     for ( int n = skip; n < depth; n++ )
 232     {
 233         wxStackFrame frame(n, addresses[n-skip], symbols[n-skip]);
 234         OnStackFrame(frame);
 235     }
 236 }
 237
 238 #endif // wxUSE_STACKWALKER