Dynamic loading of libbfd, no more dependency on specific libbfd version!

mrw/stacktrace.cpp

@@ -9,6 +9,9 @@
     @license LGPL, see file <a href="license.html">COPYING</a>
 
     $Log$
+    Revision 1.11  2005/02/18 15:48:56  marc
+    Dynamic loading of libbfd, no more dependency on specific libbfd version!
+
     Revision 1.10  2005/01/28 07:51:24  marc
     improved and corrected trace formatting
 
@@ -50,6 +53,7 @@
 #include <mrw/string.hpp>
 #include <mrw/list.hpp>
 #include <mrw/stdext.hpp>
+#include <mrw/dynamiclibrary.hpp>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -215,12 +219,25 @@ mrw::StackTrace::CodePos mrw::StackTrace::translate(void* addr)
 bool mrw::StackTrace::createSymtable(const std::string& fname, void* offs)
     throw(std::bad_exception) {
   if (_dic.find(fname)!=_dic.end()) return true; // already loaded
+  try {
+    static DynamicLibrary lib("libbfd");
+    static bfd*(*bfd_openr)(const char*, const char*) =
+      (bfd*(*)(const char*, const char*))lib.symbol("bfd_openr");
+    static bfd_boolean(*bfd_check_format)(bfd*, bfd_format) =
+      (bfd_boolean(*)(bfd*, bfd_format))lib.symbol("bfd_check_format");
+    static bfd_boolean(*bfd_check_format_matches)(bfd*, bfd_format, char***) =
+      (bfd_boolean(*)(bfd*, bfd_format, char***))
+      lib.symbol("bfd_check_format_matches");
+    static void(*bfd_map_over_sections)
+      (bfd*, void(*)(bfd*, asection*, void*), void*) =
+      (void(*)(bfd*, void(*)(bfd*, asection*, void*), void*))
+      lib.symbol("bfd_map_over_sections");
     if (fname=="") return createSymtable(filename());
-  AutoBfd abfd(bfd_openr(fname.c_str(), 0));
+    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())) ||
+    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
@@ -234,8 +251,11 @@ bool mrw::StackTrace::createSymtable(const std::string& fname, void* offs)
     _syms[fname] = syms;
     _dic[fname];
     std::pair<std::string, void*> fileoffs = std::make_pair(fname, offs);
-  bfd_map_over_sections(_bfd[fname], buildSectionMap, &fileoffs);
+    (*bfd_map_over_sections)(_bfd[fname], buildSectionMap, &fileoffs);
     return true;
+  } catch (...) {
+    return false; // shared library for bfd not found or similar
+  }
 }
 
 //----------------------------------------------------------------------------
@@ -249,6 +269,17 @@ bool mrw::StackTrace::createSymtable(const mrw::StackTrace::BinFiles& files)
   return success;
 }
 
+//----------------------------------------------------------------------------
+int mrw::StackTrace::bfdClose(bfd* abfd) throw() {
+  try {
+    static DynamicLibrary lib("");
+    static int(*bfd_close)(bfd*) = (int(*)(bfd*))lib.symbol("bfd_close");
+    return (*bfd_close)(abfd);
+  } catch (...) {
+    return -1; // dynamic library loading problems
+  }
+}
+
 //----------------------------------------------------------------------------
 mrw::StackTrace::BinFiles mrw::StackTrace::filename()
   throw(std::bad_exception) {
@@ -308,5 +339,5 @@ void mrw::StackTrace::buildSectionMap(bfd* abfd, asection* section,
 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::StackTrace::AutoBfd> mrw::StackTrace::_bfd;
 std::map<std::string, mrw::AutoPtr<asymbol*> > mrw::StackTrace::_syms;

mrw/stacktrace.hpp

@@ -9,6 +9,9 @@
     @license LGPL, see file <a href="license.html">COPYING</a>
 
     $Log$
+    Revision 1.13  2005/02/18 15:48:56  marc
+    Dynamic loading of libbfd, no more dependency on specific libbfd version!
+
     Revision 1.12  2005/01/28 12:13:11  marc
     interference between group name StackTrace and class name StackTrace
 
@@ -264,12 +267,15 @@ namespace mrw {
           @note This method calls the other one for all files in
           parameter @c files.
       */
-      static bool createSymtable(const BinFiles& files) throw(std::bad_exception);
+      static bool createSymtable(const BinFiles& files)
+        throw(std::bad_exception);
     
     private:
       //............................................................... typedefs
-      typedef std::map<bfd_vma, std::pair<bfd_vma, asection*> >
-        Translator;
+      typedef std::map<bfd_vma, std::pair<bfd_vma, asection*> > Translator;
+      static int bfdClose(bfd*) throw();
+      typedef mrw::AutoResource<bfd*, int(*)(bfd*), StackTrace::bfdClose, int>
+        AutoBfd;
       //.............................................................. variables
       AddressTrace _trace;
       static std::map<std::string, Translator> _dic;