| 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 | // we have 3 more "intermediate" frames which the calling code doesn't know |
| 229 | // about., account for them |
| 230 | skip += 3; |
| 231 | |
| 232 | for ( int n = skip; n < depth; n++ ) |
| 233 | { |
| 234 | wxStackFrame frame(n - skip, addresses[n], symbols[n]); |
| 235 | OnStackFrame(frame); |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | #endif // wxUSE_STACKWALKER |